JP7206005B2 - Fastening member - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening member for attaching a railroad undercover to a bogie.

Bogies of railroad vehicles support the car body via air springs on the bogie frame, and the propulsive force generated by the rotation of the wheels and the braking force during braking are transmitted to the car body, allowing the car to run stably along the rails. be able to. Various devices such as a brake device, a traction motor, a gear device, a yaw damper, and a wheel set are attached to the bogie frame of such a bogie, and the lower part thereof has an uneven shape due to the various devices attached. Therefore, in the lower portion of the bogie, the air flow is disturbed and eddy currents are likely to occur when the vehicle is running, which causes noise inside and outside the vehicle. In addition, when the vehicle is running, the ballast spread under the rails may be rolled up, causing damage to the surfaces of various devices under the bogie. Patent Literature 1 describes mounting an undercover to cover and smooth the bottom of the bogie in order to suppress such noise and to suppress damage due to ballast.

JP-A-7-125635

By the way, railway vehicles need to be inspected periodically for safe running, and various devices attached to the bogie frame also need to be inspected periodically. Therefore, it is necessary to remove the undercover attached to the lower part of the truck during regular inspection of the railway vehicle to inspect various devices, and attach the undercover to the lower part of the truck when the inspection is finished. However, since the railway vehicle itself is large, the undercover attached to the lower part of the bogie is also inevitably large.

SUMMARY OF THE INVENTION The present invention has been made to solve these conventional problems, and its object is to provide a fastening member that is excellent in the workability of attaching and detaching an undercover.

In order to solve the above problems, the fastening member of the present invention is a fastening member for attaching an undercover to a railway bogie, comprising: a support member for supporting the upper and lower surfaces of the undercover; A connecting hole is formed in the support member and the damping rubber, into which a connecting rod provided on the truck is inserted.

According to the above configuration, the fastening member can be connected to the connecting rod by inserting the connecting rod provided on the truck into the connecting hole formed in the support member and the damping rubber. If the fastening member is attached to the undercover, the undercover can be attached to the truck simply by connecting the connecting rod to the fastening member. The workability of mounting and removing the undercover is improved.

In the above invention, the support member includes a first support member and a second support member, and the first support member includes a first cylindrical portion and a first brim extending outward from a lower end portion of the first cylindrical portion. the second support member includes a second tubular portion and a second brim extending outward from a lower end portion of the second tubular portion; and the first brim supports the upper surface of the undercover. In addition, it is preferable that the second flange supports the lower surface of the undercover.

In the above invention, when the support member supports the undercover, the top surface of the first brim portion is flush with the top surface of the undercover, and the bottom surface of the second brim portion is flush with the undercover. is preferably flush with the lower surface of the

In the above invention, the second tubular portion can be inserted into the first tubular portion with its outer peripheral surface in contact with the inner peripheral surface of the first tubular portion. The outer peripheral surface is formed with a stepped portion extending parallel to the second flange portion and abutting against the first tubular portion to restrict the insertion of the second tubular portion into the first tubular portion. , the upper surface of the first flange portion is flush with the upper surface of the undercover in a state in which the first cylindrical portion is in contact with the step, and the lower surface of the second flange portion is flush with the lower surface of the undercover. It is preferable to be flush with.

According to the present invention, it is possible to obtain a fastening member that is excellent in workability for mounting and removing the undercover.

(a) is a schematic plan view of a truck, (b) is a schematic side view of a truck. (a) is a schematic plan view of a truck showing a state in which the undercover of the present embodiment is attached, and (b) is a schematic side view of the truck showing a state in which the undercover of the present embodiment is attached. The figure explaining an undercover. The perspective view of the 1st division|segmentation board material which comprises an undercover. The perspective view of the 2nd division|segmentation board material which comprises an undercover. The figure which combined the 1st division|segmentation board material and the 2nd division|segmentation board material. (a) is a perspective view of the core layer, (b) is a cross-sectional view along the α-α line in (a), and (c) is a cross-sectional view along the β-β line in (a). (a) is a perspective view of a sheet material forming a core layer, (b) is a perspective view showing a state in which the sheet material is being folded, and (c) is a perspective view showing a state in which the sheet material is folded. The perspective view of a fastening member. Sectional drawing of the state where the fastening member was attached. The figure explaining the support member of a fastening member. The figure explaining the method of attaching a fastening member to an undercover. The figure explaining how to attach an undercover to a truck. (a) is a perspective view of a modification of the fastening member, and (b) is a sectional view of a state in which the modification of the fastening member is attached. The figure explaining the support member of the example of a change of a fastening member. The figure explaining the example of a change of an undercover. The figure explaining the example of a change of the method of attaching an undercover to a trolley.

The fastening member of this embodiment is for attaching an undercover made of a hollow plate material to the lower part of a bogie of a railway vehicle.
As shown in FIGS. 1(a) and 1(b), the bogie includes a bogie frame 1, a braking device 2, a traction motor 3, a gear device 4, a yaw damper 5, an air spring 7, and the like. The upper vehicle body T is supported via. Wheelsets 8 are attached to the front and rear of the bogie frame 1 . As shown in FIG. 1(a), a pair of yaw dampers 5, air springs 7, etc. are provided in the width direction. On the other hand, the braking device 2, the traction motor 3, the gear device 4, etc. are provided in pairs in the front-rear direction. arranged symmetrically.

As shown in FIGS. 2(a) and 2(b), the undercover 10 of this embodiment is made of a thermoplastic resin hollow plate, and is fastened to the bogie frame 1 by a large number of fastening members 50 (shown in FIG. 4). is installed below the FIG. 2(a) is a top view of the truck, and the undercover 10 attached to the bottom of the truck is indicated by a chain double-dashed line.

As shown in FIGS. 2A and 3 , the undercover 10 has a substantially rectangular shape in a plan view, and a part of the undercover 10 protrudes, covering a wide area below the bogie frame 1 . In the undercover 10, the protruding part of the substantially rectangular shape in plan view is located point-symmetrically with respect to the center point N of the undercover 10, and as a result, the undercover 10 is positioned with respect to the center point N of itself. The shape is point symmetrical. The undercover 10 of this embodiment is attached to the bogie frame 1 with its center point N aligned with the center point M of the bogie. While covering from outside, the brake device 2, the gear device 4, the yaw damper 5, a part of the air spring 7, the wheel shaft 8, etc. are exposed downward.

As shown in FIG. 3, the undercover 10 of the present embodiment is divided into four plate members, two first divided plate members 11 having the same shape and size, and two first divided plate members 11 having the same shape and size. It is composed of the second divided plate member 12 . The first split plate member 11 is formed in a substantially L-shape when viewed from the front, and is arranged point-symmetrically with respect to the center point N of the undercover 10 . In addition, the second divided plate member 12 is formed in a rectangular shape when viewed from the front, and is arranged at points symmetrical with respect to the center point N of the undercover 10 . The first split plate member 11 is arranged in the longitudinal direction of the vehicle body T with the undercover 10 attached to the bogie frame 1 , and the second split plate member 12 is arranged in the width direction of the vehicle body T. A large number of mounting holes 10 a for mounting the fastening members 50 are formed in the under cover 10 .

Next, the structure of the undercover 10 will be described. First, the first split plate member 11 will be described. As shown in FIG. 3 , the two first split plate members 11 are arranged in the longitudinal direction of the vehicle body T when attached to the bogie frame 1 . Note that the two first split plate members 11 have the same shape and size, and are arranged point-symmetrically in the front-rear direction. The plate material 11 will be explained. Further, the front and rear of the split plate members 11 and 12 referred to below correspond to the front and rear of the vehicle body T when the split plate members 11 and 12 are attached to the bogie frame 1 . Also, the left and right of the divided plate members 11 and 12 correspond to the left and right when facing forward.

As shown in FIG. 4, the first divided plate member 11 arranged on the front side of the bogie frame 1 has a first portion 13 which is rectangular in front view and a second portion 14 which is rectangular in front view and smaller than the first portion. and is formed in a substantially L shape as a whole when viewed from the front. The rear edge of the first split plate 11 is linear, while the front edge of the first portion 13 projects forward at the front edge, and the front edge of the second portion 14 is located behind the front edge of the first portion 13. are doing.

The first divided plate member 11 is formed by press-molding a hollow plate member, and has a honeycomb structure in which a plurality of hexagonal columnar cells that are open in the plate thickness direction are arranged side by side. The hollow plate material is compressed at all the edges 11a of the first divided plate material 11 so that the honeycomb structure inside the hollow plate material is not exposed to the outside. Therefore, it becomes difficult for air to enter the interior of the hollow plate member when the vehicle is running, and an increase in air resistance can be suppressed. Also, noise can be suppressed when the vehicle is running.

The front end of the first portion 13 of the first divided plate 11 is formed with a curved inclined surface 13a that gradually slopes upward toward the front. A curved sloped surface 14a that slopes upward gradually is formed. The shapes of the inclined surfaces 13a and 14a are designed so that the space between the undercover 10 and the lower ends of various devices covered from below by the undercover 10 is as small as possible. By forming the inclined surfaces 13a and 14a into such a shape, it is possible to reduce the air resistance to the first divided plate member 11 during running of the vehicle, thereby suppressing noise. In addition, it is possible to stabilize the mounting state of the first split plate member 11 while the vehicle is running.

A side wall 13b is formed at the front portion of the right edge of the first portion 13 . The side wall 13b is erected substantially vertically from the right edge of the first portion 13. As shown in FIG. A rear edge 13c (11a) of the side wall 13b has a curved shape that gradually slopes downward toward the rear.

A side wall 13 d is formed at the front portion of the left edge of the first portion 13 . The side wall 13d is erected substantially vertically from the left edge of the first portion 13. As shown in FIG. The rear edge of the side wall 13d has a curved shape that gradually slopes downward as it goes rearward.

The plane portion 13e positioned rearward from the inclined surface 13a of the first portion 13 and the flat portion 14b positioned rearward from the inclined surface 14a of the second portion 14 are horizontal when the first divided plate member 11 is attached to the bogie frame 1. It is considered to be a smooth surface. A large number of mounting holes 10a for mounting fastening members 50, which will be described later, are provided through the planar portions 13e and 14b. Note that FIG. 4 shows a state in which the fastening member 50 is attached to one of the attachment holes 10a. A concave portion 10b recessed downward from the upper surfaces of the flat portions 13e and 14b is formed on the upper surface of the flat portions 13e and 14b outside the peripheral edge of the mounting hole 10a. A concave portion 10c is formed on the lower surface of each of the portions 13e and 14b. FIG. 4 shows only the recess 10b on the top surface, and the recess 10c on the bottom surface is shown in FIG. As shown in FIG. 4, the honeycomb structure inside the hollow plate material is exposed to the outside on the inner peripheral surface of the mounting hole 10a. It may be in a non-exposed state.

Next, the second split plate member 12 will be described. As shown in FIG. 3, the two second split plate members 12 are arranged in the lateral direction of the vehicle body T when attached to the bogie frame 1. The two second split plate members 12 have the same shape and the same size. , are arranged point-symmetrically in the left-right direction, so here, the second split plate member 12 arranged on the right side of the bogie frame 1 will be described.

The second divided plate member 12 is formed by press-molding a hollow plate member, and has a honeycomb structure in which a plurality of hexagonal columnar cells that are open in the plate thickness direction are arranged side by side. The hollow plate member is compressed at all edges 12a of the second divided plate member 12, and the honeycomb structure inside the hollow plate member is not exposed to the outside. Therefore, an increase in air resistance during vehicle travel is suppressed, and noise during vehicle travel is suppressed.

As shown in FIG. 5, the second split plate member 12 arranged on the right side of the bogie frame 1 is formed in a rectangular shape when viewed from the front. The front edge and the rear edge of the second split plate member 12 are linear. At the front end of the second partition plate 12, there is formed a curved inclined surface 12b that gradually inclines upward toward the front, and at the rear end, a curved surface that gradually inclines upward toward the rear is formed. An inclined surface 12c is formed. The shapes of the inclined surfaces 12b and 12c are designed so that the space between the undercover 10 and the lower ends of various devices covered from below by the undercover 10 is as small as possible. By forming the inclined surfaces 12b and 12c into such a shape, it is possible to reduce the air resistance to the second split plate member 12 when the vehicle is running, suppress noise, and furthermore, it is possible to control the mounting state of the second split plate member 12 when the vehicle is running. can be stabilized.

A side wall 12 d is formed on the right edge of the second divided plate member 12 . The side wall 12d is erected substantially vertically from the right edge of the second split plate member 12. As shown in FIG. A side wall 12 e is formed at the rear portion of the left edge of the second split plate member 12 . The side wall 12e is erected substantially vertically from the left edge of the second split plate member 12. As shown in FIG. A front edge 12f (12a) of the side wall 12e has a curved shape that gradually slopes downward toward the front.

Between the inclined surface 12b and the inclined surface 12c of the second divided plate member 12, a flat portion 12g is formed as a smooth surface that becomes horizontal when the second divided plate member 12 is attached to the bogie frame 1. As shown in FIG. A large number of mounting holes 10a for mounting fastening members 50, which will be described later, are provided through the planar portion 12g. A concave portion 10b recessed downward from the upper surface of the flat portion 12g is formed on the upper surface of the flat portion 12g outside the peripheral edge of the mounting hole 10a. is formed with a recess 10c (shown in FIG. 12) recessed upward from the lower surface of the flat portion 12g. The honeycomb structure inside the hollow plate material is exposed to the outside on the inner peripheral surface of the mounting hole 10a, but the honeycomb structure may not be exposed to the outside by heat-melting the end face.

As shown in FIG. 6, the undercover 10 is arranged such that the first divided plate member 11 positioned forward when attached to the bogie frame 1 faces the inclined surface 13a forward, and the first divided plate member positioned rearward. The plate member 11 is arranged with the inclined surface 13a facing backward. The second divided plate member 12 on the right side is arranged with the inclined surface 12b facing forward, and the second divided plate member 12 on the left side is arranged with the inclined surface 12b facing rearward. At this time, the rear edge 13c (11a) of the side wall 13b of the first split plate member 11 on the front is arranged along the side edge 12a of the inclined surface 12b of the second split plate member 12 on the right. Almost no gap is formed between the edge 13c and the side edge 12a. Further, the left side edge 11a of the second portion 14 of the first front split plate member 11 is arranged along the rear edge 12f (12a) of the side wall 12e of the left second split plate member 12. Therefore, almost no gap is formed between the edge 11a and the edge 12f. Such a relationship is the same between the rear first split plate member 11 and both the left and right second split plate members 12 . Moreover, there are almost no gaps between the edges 11a of the first split plate members 11 adjacent in the front-rear direction, and between the edges 11a of the first split plate member 11 and the edges 12a of the second split plate members 12 adjacent in the left-right direction. not formed. Therefore, when the undercover 10 is attached to the bogie frame 1, the split plate members 11 and 12 are arranged side by side with almost no gap between them, which increases air resistance and prevents the split plate members 11 and 12 from separating. Fluttering and accompanying noise generation can be suppressed.

Next, the structure of the hollow plate material that constitutes the undercover 10 of this embodiment will be described.
As shown in FIG. 7A, the hollow plate material of the present embodiment is formed by joining laminate sheets 30 and 40 to both upper and lower surfaces of a core layer 20 in which a plurality of cells S are arranged side by side by heat welding. there is As shown in FIGS. 7(b) and 7(c), the core layer 20 is formed by folding a single sheet material made of polyamide resin and molded into a predetermined shape. The core layer 20 is composed of an upper wall 21, a lower wall 22, and an intermediate wall 23 erected between the upper wall 21 and the lower wall 22 and having hexagonal columnar tubular portions arranged side by side. Also, the upper wall 21 , the lower wall 22 and the intermediate wall 23 define hexagonal columnar cells S inside the core layer 20 .

As shown in FIGS. 7B and 7C, the cells S defined inside the core layer 20 include a first cell S1 and a second cell S2 having different configurations. As shown in FIG. 7(b), the first cell S1 is closed at its upper end by an upper wall 21 having a two-layer structure and at its lower end by a lower wall 22 having a single-layer structure. Each layer of the upper wall 21 of this two-layer structure is bonded to each other. On the other hand, as shown in FIG. 7C, the second cell S2 is closed at its upper end by a single-layer upper wall 21 and at its lower end by a double-layer lower wall 22 . Each layer of the lower wall 22 having the two-layer structure is joined to each other. Further, as shown in FIGS. 7B and 7C, the adjacent first cells S1 and the adjacent second cells S2 are partitioned by intermediate walls 23 having a two-layer structure. there is

As shown in FIG. 7A, the first cells S1 and the second cells S2 are arranged so that the first cells S1 or the second cells S2 are adjacent to form a row in the X direction. In addition, the rows of the first cells S1 and the rows of the second cells S2 are alternately arranged adjacent to each other in the Y direction orthogonal to the X direction. The core layer 20 has a honeycomb structure with these first cells S1 and second cells S2. A hollow plate member is formed by joining laminate sheets 30 and 40 to the upper and lower surfaces of the core layer 20 formed in this manner by thermal welding.

As shown in FIGS. 7B and 7C, the upper surface of the hollow plate is composed of the upper wall 21 of the core layer 20 and the laminate sheet 30, and the lower surface of the hollow plate is the lower wall 22 of the core layer. and a laminate sheet 40.

As shown in FIG. 7(b), the laminate sheet 30 on the upper surface includes a polyamide resin skin layer 30a arranged on the outer surface side (upper side in FIG. 7(b)) and an adhesive layer 30a joined to the skin layer 30a. It has a two-layer structure with the layer 30b, and the skin layer 30a is bonded to the core layer 20 via the adhesive layer 30b. That is, the adhesive layer 30b is interposed between the core layer 20 and the skin layer 30a in the hollow plate.

As shown in FIG. 7(b), the laminate sheet 40 on the lower surface, like the laminate sheet 30 on the upper surface, has a polyamide resin skin layer 40a arranged on the outer surface side (lower side in FIG. 7(b)). , and an adhesive layer 40b bonded to the skin layer 40a. The skin layer 40a is bonded to the core layer 20 via the adhesive layer 40b. That is, the adhesive layer 40b is interposed between the core layer 20 and the skin layer 40a in the hollow plate. The skin layer 40a and the adhesive layer 40b in the laminate sheet 40 are formed to have the same thickness as the skin layer 30a and the adhesive layer 30b in the laminate sheet 30, respectively. By bonding the laminate sheet 30 and the laminate sheet 40 of the same material and having the same thickness to the upper and lower surfaces of the core layer 20, respectively, the hollow plate material is less likely to warp.

Next, a mode of forming the core layer 20 by folding one sheet material 100 will be described.
As shown in FIG. 8(a), the sheet material 100 is formed by molding one polycarbonate sheet into a predetermined shape. In the sheet material 100, strip-shaped planar regions 110 and swollen regions 120 are alternately arranged in the width direction (X direction). In the bulging region 120 , a first bulging portion 121 having a downward groove shape in cross section and having an upper surface and a pair of side surfaces is formed over the entirety of the extending direction (Y direction) of the bulging region 120 . The angle formed by the upper surface and the side surface of the first bulging portion 121 is preferably 90 degrees, and as a result, the cross-sectional shape of the first bulging portion 121 is downward U-shaped. In addition, the width of the first bulging portion 121 (the length of the upper surface in the lateral direction) is equal to the width of the plane region 110, and the bulging height of the first bulging portion 121 (the length of the lateral surface in the lateral direction) ) is set to be twice as long.

As shown in FIG. 8( a ), in the bulging region 120 , a plurality of second bulging portions 122 each having a trapezoidal cross-sectional shape obtained by bisected a regular hexagon along the longest diagonal line are arranged in the first bulging region. It is formed so as to be orthogonal to the protruding portion 121 . The bulging height of the second bulging portion 122 is set to be equal to the bulging height of the first bulging portion 121 . Also, the interval between adjacent second bulging portions 122 is equal to the width of the upper surfaces of the second bulging portions 122 . The first swelling portion 121 and the second swelling portion 122 are formed by partially swelling the sheet upward using the plasticity of the sheet. Moreover, the sheet material 100 can be molded from one sheet by a well-known molding method such as a vacuum molding method or a compression molding method.

As shown in FIGS. 8A and 8B, the core layer 20 is formed by folding the sheet material 100 configured as described above along the boundary lines P and Q. As shown in FIGS. Specifically, the sheet material 100 is valley-folded at the boundary line P between the flat region 110 and the bulging region 120, and mountain-folded at the boundary line Q between the upper surface and the side surface of the first bulging portion 121. to compress in the X direction. Then, as shown in FIGS. 8B and 8C, the top surface and the side surface of the first bulging portion 121 are folded over, and the end surface of the second bulging portion 122 and the planar region 110 are folded over, thereby forming a single A prismatic partition 130 extending in the Y direction is formed for one bulging region 120 . The plate-shaped core layer 20 is formed by continuously forming such partitions 130 in the X direction.

At this time, the upper wall 21 of the core layer 20 is formed by the upper surface and the side surface of the first bulging portion 121 , and the lower wall 22 of the core layer 20 is formed by the end surface of the second bulging portion 122 and the planar region 110 . It is formed. In addition, as shown in FIG. 8(c), the portion of the upper wall 21 where the upper surface and the side surface of the first bulging portion 121 are folded to form a two-layer structure, and the second bulging portion 122 of the lower wall 22 The overlapped portion 131 is formed by overlapping the end face and the planar region 110 to form a two-layer structure.

As shown in FIG. 8(c), the hexagonal prism-shaped regions formed by folding the second bulging portion 122 become the second cells S2, and are divided between the pair of adjacent partitions 130. A hexagonal columnar region is the first cell S1. In the present embodiment, the upper surface and side surfaces of the second bulging portion 122 constitute the side walls of the second cell S2, and the side surface of the second bulging portion 122 and the second bulging portion 122 in the bulging region 120 The located planar portion constitutes the side wall of the first cell S1. A contact portion between the upper surfaces of the second bulging portion 122 and a contact portion between the planar portions of the bulging region 120 form the intermediate wall 23 having a two-layer structure. The upper end of the first cell S1 is closed by the pair of overlapping portions 131, and the lower end of the second cell S2 is closed by the pair of overlapping portions 131. As shown in FIG. It is preferable that the sheet material 100 is heated and softened before performing such a folding process.

Next, the laminate sheet 30 and the laminate sheet 40 are joined by heat welding to the upper and lower surfaces of the core layer 20 that has been folded and molded as described above. The laminate sheets 30, 40 are joined by thermally melting the adhesive layers 30b, 40b at a temperature higher than the temperature of the resin forming the adhesive layers 30b, 40b. In this way, a hollow plate material is obtained in which the laminate sheets 30 and 40 are joined by thermal welding to the upper and lower surfaces of the core layer 20 in which a plurality of cells S are arranged.

Next, the fastening member 50 for attaching the undercover 10 to the bogie frame 1 will be described.
As shown in FIGS. 9, 10, and 12, the fastening member 50 of this embodiment includes metal support members 51 and 52, damping rubbers 53 and 54, and a metal cylinder 55. As shown in FIGS. The support members 51 and 52 are composed of a first support member 51 that supports the undercover 10 from the upper surface side and a second support member 52 that supports the undercover 10 from the lower surface side. The damping rubbers 53 and 54 are composed of a first damping rubber 53 attached to the first support member 51 and a second damping rubber 54 attached to the second support member 52 . The metal cylinder 55 is arranged inside the first damping rubber 53 and the second damping rubber 54 . The first support member 51 is integrated with the first damping rubber 53 and the metal tube 55 by insert molding. Also, the second support member 52 is integrated with the second damping rubber 54 by insert molding.

As shown in FIGS. 10 and 11, the first support member 51 includes a substantially cylindrical first cylindrical portion 51a that gradually increases in diameter as it goes downward, and a first cylindrical portion 51a that is bent at a substantially right angle from the lower end edge of the first cylindrical portion 51a. , an annular first brim portion 51b extending outward, and an annular first cover portion 51c bent substantially at a right angle from the upper end edge of the first tubular portion 51a and extending inward. The first brim portion 51b and the first lid portion 51c extend parallel to both upper and lower surfaces of the undercover 10 when the fastening member 50 is attached to the undercover 10 . 51 d of 1st holding|maintenance holes in which the upper 1st damping rubber 53 is provided is formed in the center part of the 1st cover part 51c. A convex portion 51e extending in the circumferential direction is formed on the inner peripheral surface of the first cylindrical portion 51a.

As shown in FIGS. 10 and 11, the second support member 52 is inserted into the first cylindrical portion 51a, and includes a substantially cylindrical second cylindrical portion 52a whose diameter increases slightly downward, and a second cylindrical portion 52a. An annular second brim portion 52b that bends at a substantially right angle from the lower edge of the portion 52a and extends outward, and an annular second cover portion that bends at a substantially right angle from the upper edge of the second cylindrical portion 52a and extends inward. 52c. The second collar portion 52b and the second lid portion 52c extend parallel to both upper and lower surfaces of the undercover 10 when the fastening member 50 is attached to the undercover 10. As shown in FIG. A second holding hole 52d to which the lower second damping rubber 54 is attached is formed in the central portion of the second lid portion 52c. A recessed portion 52e extending in the circumferential direction is formed on the outer peripheral surface of the second tubular portion 52a.

As shown in FIGS. 10 and 11, the outer diameter of the second cylindrical portion 52a of the second supporting member 52 is increased by the thickness of the first cylindrical portion 51a of the first supporting member 51. formed to have a smaller diameter. Therefore, the second tubular portion 52a can be inserted into the first tubular portion 51a, and in a state of being inserted into the first tubular portion 51a, the outer peripheral surface of the second tubular portion 52a is the inner peripheral surface of the first tubular portion 51a. abuts on the surface.

Further, the second cylindrical portion 52a is formed higher than the first cylindrical portion 51a. Specifically, when the second cylindrical portion 52a is inserted into the first cylindrical portion 51a and the upper surface of the second lid portion 52c contacts the lower surface of the first lid portion 51c, the upper surface of the first collar portion 51b The height of the second cylindrical portion 52a is set so that a predetermined length H is formed between the lower surface of the second flange portion 52b and the lower surface of the second flange portion 52b. This length H is the same as the thickness of the undercover 10 .

As shown in FIG. 10, when the second cylindrical portion 52a is inserted into the first cylindrical portion 51a, the convex portion 51e formed on the inner peripheral surface of the first cylindrical portion 51a is positioned such that the upper surface of the second lid portion 52c is It is formed at a position corresponding to the concave portion 52e formed in the outer peripheral surface of the second cylindrical portion 52a while in contact with the lower surface of the first lid portion 51c.

As shown in FIGS. 10 and 11, the outer diameter of the first collar portion 51b and the outer diameter of the second collar portion 52b are the same. The outer diameters of the first brim portion 51b and the second brim portion 52b are the same as the outer diameters of the concave portion 10b formed on the upper surface of the undercover 10 and the concave portion 10c formed on the lower surface.

As shown in FIG. 12, the first vibration damping rubber 53 has a substantially cylindrical shape, and includes an upper support portion 53a mounted on the first lid portion 51c of the first support member 51, and a lower support portion 53a. and an inner support portion 53b that extends to and is held in the first holding hole 51d of the first lid portion 51c. An insertion hole 53e into which the metal cylinder 55 is inserted is formed in the central portion of the first support member 51 . A sloped surface 53c that slopes inward toward the bottom is formed on the upper outer peripheral surface of the inner support portion 53b. is formed.

A cylindrical metal tube 55 is fitted in the central portion of the first damping rubber 53 . The upper end surface of the metal cylinder 55 is substantially flush with the upper end surface of the upper support portion 53a of the first damping rubber 53, and the lower end portion of the metal cylinder 55 is aligned with the inner support portion 53b of the first damping rubber 53. is substantially flush with the lower end surface of the lower tubular portion 53d. The inner diameter of the metal tube 55 is slightly larger than the outer diameter of the connecting rod 61 attached to the bogie frame 1 .

As shown in FIG. 12, the second damping rubber 54 has a substantially cylindrical shape and is attached to the lower portion of the second cover portion 52c of the second support member 52. As shown in FIG. An upper inner peripheral surface of the second damping rubber 54 is formed with an inclined surface 54b that is inclined inward as it goes downward. An insertion hole 54 a having an inner diameter slightly larger than the outer diameter of the lower end portion of the inner support portion 53 b of the first damping rubber 53 is formed in the central portion of the second damping rubber 54 .

The fastening member 50 of the present embodiment is attached to the undercover 10 in advance, and the attachment and detachment of the undercover 10 to and from the bogie frame 1 are performed integrally with the undercover 10 to which the fastening member 50 is attached. It is.

First, a method for attaching the fastening member 50 to the undercover 10 will be described. Here, for the sake of convenience, a member in which the first support member 51, the first damping rubber 53, and the metal tube 55 on the upper surface side are integrated is referred to as a first fastening member 50a, and the second support member 52 and the second support member 52 on the lower surface side are referred to as a first fastening member 50a. A member integrated with the vibration damping rubber 54 is referred to as a second fastening member 50b. Further, the fastening members 50 are attached in the same manner to all the attachment holes 10a formed in the respective first divided plate members 11 and the respective second divided plate members 12 that constitute the undercover 10. A case of attaching to one attachment hole 10a of the plate member 11 will be described.

As shown in FIG. 12, first, the second cylindrical portion 52a of the second support member 52 of the second fastening member 50b is inserted from below the mounting hole 10a formed in the first split plate member 11. As shown in FIG. At this time, since the outer diameter of the recess 10c formed on the outer lower surface of the mounting hole 10a and the outer diameter of the second flange portion 52b of the second support member 52 are substantially the same, the second flange portion 52b is The bottom surface of the second brim portion 52b and the bottom surface of the undercover 10 (first divided plate member 11) are flush with each other.

Subsequently, the first tubular portion 51a of the first support member 51 of the first fastening member 50a is fitted onto the second tubular portion 52a. At this time, the lower end of the lower cylindrical portion 53d of the inner support portion 53b of the first damping rubber 53 of the first fastening member 50a is inserted into the insertion hole 54a formed in the second damping rubber 54 together with the lower end of the metal cylinder 55. The lower end surface of the lower cylindrical portion 53 d of the inner support portion 53 b of the first damping rubber 53 and the lower end surface of the metal cylinder 55 are flush with the lower end surface of the second damping rubber 54 .

Then, as shown in FIG. 10, the upper surface of the second lid portion 52c contacts the lower surface of the first lid portion 51c, and the insertion of the second cylindrical portion 52a into the first cylindrical portion 51a is restricted. In this state, the convex portion 51e formed on the inner peripheral surface of the first cylindrical portion 51a and the concave portion 52e formed on the outer peripheral surface of the second cylindrical portion 52a are engaged with each other, and the first supporting member 51 and the second supporting member 51 are engaged with each other. The member 52 is held in a retaining state. Also, the inclined surface 54 b of the second damping rubber 54 is pressed against the inclined surface 53 c of the first damping rubber 53 . Thus, as shown in FIG. 10, the fastening member 50 in which the first fastening member 50a and the second fastening member 50b are joined is attached to the first divided plate member 11. As shown in FIG. At this time, the first brim portion 51b is accommodated in the concave portion 10b on the top surface of the undercover 10, and the top surface of the first brim portion 51b and the top surface of the undercover 10 are flush with each other.

In this manner, the fastening members 50 are attached to all the attachment holes 10a formed in the two first split plate members 11 and the two split plate members 12, respectively.
Next, a method for attaching the undercover 10 to the bogie frame 1 and a method for removing it from the bogie frame 1 will be described. In this embodiment, by sequentially attaching the first divided plate member 11 with the fastening member 50 attached and the second divided plate member 12, the lower part of the truck is covered with the undercover 10, and the second divided plate member with the fastening member 50 attached is covered with the undercover 10. The undercover 10 is removed from the lower portion of the truck by sequentially removing the first divided plate member 11 and the second divided plate member 12 .

As shown in FIG. 13, a plurality of rod-shaped connecting rods 61 are attached to the bogie frame 1 at their upper ends so as to extend vertically. The lower outer periphery of the connecting rod 61 is threaded (not shown), and a nut 62 and an annular metal plate 63 are attached. The annular metal plate 63 has an outer diameter slightly larger than the outer diameter of the first damping rubber 53 .

Further, when attaching the undercover 10 to the bogie frame 1, in addition to the undercover 10 to which the fastening member 50 is attached, an annular metal plate 64 and a nut 65 for attaching the fastening member 50 to the connecting rod 61 are attached. prepare. The annular metal plate 64 has an outer diameter slightly larger than the outer diameter of the second damping rubber 54, and a through hole 64a having an inner diameter substantially equal to the outer diameter of the connecting rod 61 is formed in the center.

First, the first split plate member 11 is placed below the bogie frame 1, and the first split plate member 11 is moved upward to insert the connecting rod into the metal tube 55 of the fastening member 50 attached to the first split plate member 11. The lower end of 61 is inserted. As a result, the connecting rod 61 is moved through the metal tube 55 into the first holding hole 51d of the first supporting member 51, the second holding hole 52d of the second supporting member 52, the insertion hole 53e of the first damping rubber 53, It is inserted into the insertion hole 54 a of the second damping rubber 54 . Therefore, the first holding hole 51d, the second holding hole 52d, the insertion hole 53e, and the insertion hole 54a
52 and damping rubbers 53 and 54, and function as connecting holes into which connecting rods 61 are inserted.

When the connecting rod 61 is inserted into the metal cylinder 55 and the upper end surface of the first damping rubber 53 comes into contact with the metal plate 63 attached to the connecting rod 61, the lower end surface of the second damping rubber 54 moves downward. The lower end portion of the connecting rod 61 is in a protruded state.

Subsequently, the through hole 64 a of the metal plate 64 is fitted over the lower end of the connecting rod 61 projecting from the lower end surface of the second damping rubber 54 , and the lower end is tightened with the nut 65 . The upper end surface of the first damping rubber 53 is substantially flush with the upper end surface of the metal cylinder 55 , and the lower end surface of the inner support portion 53 b of the first damping rubber 53 is substantially flush with the lower end surface of the metal cylinder 55 . Since they are flush with each other, gaps are less likely to be formed between the upper and lower metal plates 63 and 64 and the first vibration damping rubber 53 and the second vibration damping rubber 54, and the undercover 10 is stabilized on the bogie frame 1. fixed.

When removing the undercover 10 from the bogie frame 1 , the nut 65 fastened to the lower end of the connecting rod 61 is loosened and removed from the lower end of the connecting rod 61 . By sequentially moving the metal plate 64 and the fastening member 50 tightened by the nut 65 downward and removing them from the connecting rod 61, the undercover 10 to which the fastening member 50 is attached (the first divided plate member 11, the second divided plate member 11, and the second divided plate member 11) The plate 12) can be removed.

According to this embodiment, the following effects can be obtained.
(1) The fastening member 50 of the present embodiment includes support members 51 and 52 that support the upper and lower surfaces of the undercover 10, and damping rubbers 53 and 54 provided inside the support members. Therefore, by selecting an appropriate spring constant of the damping rubbers 53 and 54, it is possible to stably fix the undercover 10 while insulating the vibration between the bogie frame 1 and the undercover 10.

(2) In the fastening member 50 of the present embodiment, the first support member 51 is formed with the first holding hole 51d, and the second support member 52 is formed with the second holding hole 52d. An insertion hole 53e is formed in the first damping rubber 53, and an insertion hole 54a is formed in the second damping rubber 54. As shown in FIG. By inserting the connecting rod 61 attached to the bogie frame 1 into the first holding hole 51d, the second holding hole 52d, the insertion hole 53e, and the insertion hole 54a through the metal cylinder 55, the fastening is performed. The member 50 can be attached to the connecting rod 61 as a unit. Attachment and detachment of the fastening member 50 can be easily performed.

(3) When the fastening member 50 of the present embodiment is attached to the undercover 10, the top surface of the first brim portion 51b of the first support member 51 and the top surface of the undercover 10 are flush with each other, and the second support member 52 The lower surface of the second collar portion 52b and the lower surface of the undercover 10 are flush with each other. Therefore, it is possible to reduce air resistance when the vehicle is running, and to suppress noise.

(4) In the fastening member 50 of the present embodiment, the first support member 51 and the second support member 52 are joined together by engagement of the convex portion 51e and the concave portion 52e. With a simple configuration, the first support member 51 and the second support member 52 can be engaged, and the fastening state of the fastening member 50 can be stabilized.

(5) In the fastening member 50 of the present embodiment, the inclined surface 53c is formed on the outer periphery of the lower cylindrical portion 53d of the inner support portion 53b of the first damping rubber 53, and the inclined surface 54b is formed on the outer periphery of the upper portion of the second damping rubber 54. is formed, and the inclined surface 53c is pressed against the inclined surface 54b when the first fastening member 50a and the second fastening member 50b are fastened. Therefore, the first damping rubber 53 and the second damping rubber 54 can be firmly tightened.

(6) The undercover 10 is attached to the bogie frame 1 and removed from the bogie frame 1 with the fastening member 50 attached. The fastening member 50 is attached by tightening the metal plate 64 and the nut 65 to the connecting rod 61 attached to the bogie frame 1, and the fastening member 50 is removed by removing the metal plate 64 and the nut 65 from the connecting rod 61. This is done by removing Since the undercover 10 can be attached and detached while being integrated with the fastening member 50, workability is improved. Also, the complexity of parts management is eliminated.

(7) The undercover 10 of the present embodiment is made of a resin hollow plate. Therefore, it is lighter than a metal one. Moreover, the work load is reduced when the undercover 10 is attached and removed.

(8) The undercover 10 of this embodiment is divided into two first divided plate members 11 and two second divided plate members 12 . Therefore, the size of each divided plate member 11, 12 is reduced, and the weight of each divided plate member 11, 12 can be reduced.

(9) The undercover 10 of this embodiment is divided into the first divided plate member 11 and the second divided plate member 12 having different shapes and sizes. The first split plate member 11 is composed of two pieces having the same shape and size, and the second split plate member 12 is composed of two pieces having the same shape and size. Two first divided plate members 11 are arranged point-symmetrically, and two second divided plate members 12 are arranged point-symmetrically. Therefore, the undercover 10 divided into four can be composed of two types of divided plate members 11 and 12 having different shapes and different sizes. It is possible to reduce the types of the divided plate members 11 and 12 while reducing the size and weight of the divided plate members 11 and 12 that constitute the undercover 10 . It is advantageous in terms of cost.

(10) Since the undercover 10 is made of resin, even if the rolled-up ballast hits the surface of the undercover 10, the ballast is prevented from rebounding on the surface of the undercover 10. In the case of the undercover 10 made of resin, the ballast bites into the resin, and the impact of rebounding ballast on the wiring of the vehicle, the equipment of the peripheral wall of the track, etc. is suppressed compared to the case of the undercover made of metal.

(11) A railway vehicle needs to be periodically inspected for safe running, and during inspection, it is necessary to remove or attach the undercover 10 attached to the bogie frame 1 . Since the undercover 10 of this embodiment can reduce the size of each of the divided plate members 11 and 12, it is excellent in workability when the undercover 10 is attached to or removed from the bogie frame 1. .

(12) When the undercover 10 is attached to the truck, a part of the front end projects forward and a part of the rear end projects rearward. All of the parts are curved upwards. Therefore, it is possible to suppress an increase in air resistance during vehicle travel. The generation of noise can be suppressed, and the fluttering of the undercover 10 can be suppressed.

(13) The first split plate member 11 has inclined surfaces 13a and 14a curved upward at one end, and the two first split plate members 11 are arranged in the longitudinal direction of the truck. The second split plate member 12 has inclined surfaces 12b and 12c that curve upward at both ends, and the two second split plate members 12 are arranged in the lateral direction of the truck. Therefore, the inclined surfaces 12b, 12c, 13a, and 14a are formed in all of the front and rear directions of the undercover. Even when the vehicle travel direction is reversed front to back, an increase in air resistance to the undercover 10 can be suppressed.

(14) At all the edges 11a of the first split plate 11 and all the edges 12a of the second split plate 12, the honeycomb structure inside the hollow plate is not exposed to the outside. Therefore, it becomes difficult for air to enter the interior of the hollow plate member when the vehicle is running, and an increase in air resistance can be suppressed. Also, noise can be suppressed when the vehicle is running.

(15) The hollow plate material constituting the undercover 10 is constructed by bonding skin layers 30a and 40a made of polyamide resin to a core layer 20 made of polyamide resin. Since the undercover 10 is made of a polyamide resin, the undercover 10 is excellent in impact absorption resistance, heat resistance, and cold resistance.

The above embodiments may be modified as follows, and these modified examples may be applied in combination as appropriate.
- The shape of the fastening member 50 is not limited to the shape of this embodiment. A fastening member 70 having a shape as shown in FIG. 14 may be used. Here, the points different from the fastening member 50 of the present embodiment will be mainly described.

A fastening member 70 shown in FIGS. 14A and 14B is composed of support members 71 and 72 and damping rubbers 73 and 74, and the metal cylinder 55 is not provided. As shown in FIG. 15, the first cylindrical portion 71a of the first support member 71 that supports the upper surface of the undercover 10 has a cylindrical shape whose outer diameter does not change in the vertical direction except for the portion where the convex portion 71e is formed. The second cylindrical portion 72a of the second support member 72 that supports the lower surface of the undercover 10 also has a cylindrical shape whose outer diameter does not change in the vertical direction except for the portion where the concave portion 72e and the step 72f described later are formed. ing. The inner diameter of the first holding hole 71d formed in the first lid portion 71c and the inner diameter of the second holding hole 72d formed in the second lid portion 72c are the same.

As shown in FIG. 15, a step 72f extending parallel to the second collar portion 72b is formed on the outer peripheral surface of the second tubular portion 72a. The step 72f is formed to have a larger diameter than the inner diameter of the first cylindrical portion 71a, and when the lower end of the inner peripheral surface of the first cylindrical portion 71a abuts on the step 72f, the first cylindrical portion 71a of the second cylindrical portion 72a is moved. Insertion into the body is restricted. The formation position of the step 72f is such that the distance between the upper surface of the first flange portion 71b and the lower surface of the second flange portion 72b when the lower end of the inner peripheral surface of the first cylindrical portion 71a abuts on the step 72f. The position is the same as the thickness. When the lower end of the inner peripheral surface of the first cylindrical portion 71a is in contact with the step 72f, the upper surface of the second lid portion 72c is in contact with the lower surface of the first lid portion 71c.

As shown in FIG. 14(b), the first damping rubber 73 has a substantially truncated cone shape in which the outer periphery of the lower end portion is notched, and the lower end portion is formed in the first holding hole of the first lid portion 71c. 71d. An insertion hole 73 e having a diameter slightly larger than the outer diameter of the connecting rod 61 attached to the bogie frame 1 is formed in the central portion of the first damping rubber 73 . The second damping rubber 74 has a substantially inverted truncated conical shape with the outer periphery of the upper end portion notched, and the upper end portion is held in the second holding hole 72d of the second lid portion 72c. . An insertion hole 74a having a diameter slightly larger than the outer diameter of the connecting rod 61 is formed in the central portion of the second damping rubber 74 .

The first supporting member 71 is integrated with the first damping rubber 73 by insert molding, and the second supporting member 72 is integrated with the second damping rubber 74 by insert molding. Then, the second tubular portion 72a of the second support member 72 is inserted from the lower surface of the undercover 10, and the first tubular portion 71a of the first support member 71 is fitted onto the second tubular portion 72a from the upper surface of the undercover 10. Therefore, it may be attached to the undercover 10 .

When attaching the undercover 10 to which the fastening member 70 is attached to the bogie frame 1, the connecting rod 61 attached to the bogie frame 1 is inserted into the insertion hole 73e of the first damping rubber 73 of the fastening member 70 and the second 2, it is inserted into the insertion hole 74a of the damping rubber 74, and the nut 65 is fastened to the lower end. As with the fastening member 50 of this embodiment, the undercover 10 can be stably attached to the bogie frame 1 . Further, by forming the step 72f, the first support member 71 and the second support member 72 can be easily positioned. Although the metal plates 63 and 64 are not provided in FIG. 14, they may be provided.

- In the fastening member 50 of the present embodiment, the outer diameter of the second cylindrical portion 52a of the second support member 52 is formed to be smaller than the outer diameter of the first cylindrical portion 51a, and is inserted into the first cylindrical portion 51a. In this state, the outer peripheral surface of the second cylindrical portion 52a is in contact with the inner peripheral surface of the first cylindrical portion 51a. The outer diameter of the second cylindrical portion 52a is not limited to this, and is larger than the outer diameter of the first cylindrical portion 51a to the extent that the outer peripheral surface of the second cylindrical portion 52a does not contact the inner peripheral surface of the first cylindrical portion 51a. It may be formed to have a small diameter.

- In the fastening member 50 of the present embodiment, the convex portion 51e formed on the inner peripheral surface of the first cylindrical portion 51a and the concave portion 52e formed on the outer peripheral surface of the second cylindrical portion 52a are engaged. but not limited to this. A concave portion may be formed on the inner peripheral surface of the first cylindrical portion 51a, and a convex portion may be formed on the outer peripheral surface of the second cylindrical portion 52a. Moreover, these protrusions and recesses may not be formed over the entire circumferences of the first cylindrical portion 51a and the second cylindrical portion 52a, and may be formed on a part of the inner and outer peripheral surfaces. The shape thereof may not be convex or concave extending in the horizontal direction, but may be arcuate, polygonal, or indeterminate in plan view.

- It is good also as a structure which engages with the 1st cylinder part 51a and the 2nd cylinder part 52a by the engagement member as a separate member from the 1st cylinder part 51a and the 2nd cylinder part 52a.
- In the fastening member 50 of the present embodiment, the first supporting member 51 is formed with the annular first flange portion 51b, and the second supporting member 52 is formed with the annular second flange portion 52b. , the first brim portion 51b and the second brim portion 52b are not limited thereto. It may be polygonal or irregular. Also, the size and shape of the first brim portion 51b and the second brim portion 52b may not be the same. In this case, it is preferable that the recesses 10b and 10c formed in the undercover 10 have a shape capable of accommodating the first brim portion 51b and the second brim portion 52b.

- A projection may be provided on the lower surface of the first flange portion 51b, or may be provided on the upper surface of the second flange portion 52b. By providing the projection, the fastening member 50 is suppressed from spinning when it is fastened to the undercover 10 .

- In the fastening member 50 of the present embodiment, the metal tube 55 is fitted in the central portion of the first damping rubber 53 attached to the first support member 51. It may be configured to be fitted into the second damping rubber 54 attached to the member 52 . Also, the metal cylinder 55 can be omitted.

・ In the fastening member 50 of the present embodiment, the upper end surface of the metal tube 55 is substantially flush with the upper end surface of the first rubber damping rubber 53 , and the lower end surface of the metal tube 55 is substantially flush with the upper end surface of the first rubber damping rubber 53 . Although it is substantially flush with the lower end surface of the inner support portion 53b, it is not limited to this. For example, the upper end surface of the metal tube 55 is located slightly below the upper end surface of the first damping rubber 53 , and the lower end surface of the metal tube 55 is the lower end surface of the inner support portion 53 b of the first damping rubber 53 . It may be located slightly below. According to this configuration, by tightening the nut 65 to the connecting rod 61, the first rubber damping rubber 53 and the second rubber damping 54 are crushed by elastic deformation, and the first rubber damping rubber 53 and the second rubber damping 54 is pressed against the upper and lower metal plates 63,64. The fastening member 50 is firmly fixed to the connecting rod 61 , and the undercover 10 is stably fixed to the bogie frame 1 .

- In the fastening member 50 of the present embodiment, the metal plates 63 and 64 are arranged on the upper and lower sides and are tightened by the nut 65, but at least one of the metal plates 63 and 64 can be omitted.

A nut 62 and an annular metal plate 63 are attached to the lower outer periphery of the connecting rod 61 attached to the bogie frame 1, and the lower end of the connecting rod 61 is tightened with an annular metal plate 64 and a nut 65. , the nut 62 and the metal plate 63, or the metal plate 64 and the nut 65 may be integrally formed or may be formed separately.

- In the present embodiment, when the fastening member 50 is attached to the undercover 10, the upper surface of the first brim portion 51b of the first support member 51 is flush with the upper surface of the undercover 10, and the second support member 52 of the second support member 52 is flush with the upper surface of the undercover 10. Although the lower surface of the flange portion 52b is configured to be flush with the lower surface of the undercover 10, it is not limited to this. At least one of the upper surface of the first flange portion 51b and the lower surface of the second flange portion 52b may protrude from the upper and lower surfaces of the undercover 10, or may be recessed.

In this embodiment, a plurality of rod-shaped connecting rods 61 are attached to the bogie frame 1, and the fastening members 50 are attached to the connecting rods 61. 61 may not be the only one. For example, as shown in FIG. 17 , an upward U-shaped connecting member 66 may be attached to the bogie frame 1 , and a connecting rod 67 may be attached to the connecting member 66 .

- Although the undercover 10 of the present embodiment is composed of a hollow plate material having a core layer 20 and skin layers 30a and 40a made of polyamide resin, the material is not limited to this. Other conventionally known thermoplastic resins such as polypropylene resins, polyethylene resins and polycarbonate resins can be appropriately used.

- As the thermoplastic resin that constitutes the undercover 10, one in which various elastomer components are blended may be used. By blending the elastomer component, it is possible to suppress the undercover 10 from being damaged by the ballast that has been rolled up, and to suppress the ballast from hitting the undercover 10 and rebounding. Also, a fiber-reinforced resin containing various reinforcing fibers such as carbon fiber and glass fiber may be used. The strength of the undercover 10 can be improved.

- In the undercover 10 of the present embodiment, the core layer 20 and the skin layers 30a and 40a are both made of polyamide resin, but the material of the thermoplastic resin that constitutes each layer may be different. Also, the skin layers 30a and 40a may be made of thin metal plates such as aluminum, and the core layer 20 may be made of foamed resin.

In the present embodiment, the undercover 10 is divided into two types of split plate members, the two point-symmetric first split plate members 11 and the two point-symmetric second split plate members 12, but the present invention is not limited to this. The undercover 10 may be composed of only one kind of point-symmetrical split plate material, or may be made of three or more kinds of point-symmetrical pair of split plate materials.

- In the present embodiment, both the two first divided plate members 11 and the two second divided plate members 12 are attached to the bogie frame 1 so as to be point-symmetrical, but the present invention is not limited to this. It may be attached at a line-symmetrical position, or may be attached at a non-symmetrical position.

The undercover 10 of this embodiment covers the traction motor 3 and the like attached to the bogie frame 1 from below, while the brake device 2, the gear device 4, the yaw damper 5, a part of the air spring 7, the wheelset 8, and the like. is exposed downward, but it is not limited to this. The range covered by the undercover 10 can be selected as appropriate.

- Although this embodiment demonstrated the case where the undercover 10 was attached with respect to the truck by which various apparatuses were arrange|positioned point-symmetrically, the truck used as an attachment object is not limited to this. Various devices do not necessarily have to be point symmetrical. In this case, the undercover 10 may also be divided into a plurality of divided plate members, and the shape and size thereof are not particularly limited. Each segment may have a different shape and size.

- Although the inclined surfaces 13a and 14a of the first partition plate 11 and the inclined surface 12b of the second partition plate 12 are curved, the inclined surfaces 13a, 14a and 12b may not be curved. It may be a planar inclined surface. Further, a part of the inclined surfaces 13a, 14a, and 12b may be a curved inclined surface and a part thereof may be a planar inclined surface.

At the edge 11a of the first split plate 11 and the edge 12a of the second split plate 12, the hollow plate was compressed, and the honeycomb structure inside the hollow plate was not exposed to the outside, but it was not compressed. may For example, the edges of the outermost peripheries of the divided plate members 11 and 12 may be closed with a caulking material or the like. Further, the hollow plate material may be exposed at the edge of the bogie frame 1 arranged in the left-right direction.

In the present embodiment, when the edge 11a of the first split plate member 11 and the edge 12a of the second split plate member 12 are butted against each other, no gap is formed between them. not. For example, as shown in FIG. 16, the edges 11a and 12a of the first divided plate member 11 and the second divided plate member 12 arranged in the horizontal direction may overlap each other in the vertical direction. In this case, the edge 11a of the first split plate member 11 is formed with a portion having a predetermined width in the front-rear direction and the thickness thereof is compressed downward by about half. A portion having a predetermined width in the direction and whose thickness is compressed upward by about half is formed. By overlapping the respective compressed portions, it is possible to prevent a gap from being generated between the first divided plate member 11 and the second divided plate member 12 .

The side wall 13b of the first portion 13 of the first divided plate member 11 of the present embodiment is erected substantially vertically from the right edge of the first portion 13, and the side wall 13d of the first portion 13 13 is erected in a substantially vertical state from the left edge. Further, the side wall 12d of the second divided plate member 12 is erected substantially vertically from the right edge of the second divided plate member 12, and the side wall 12e of the second divided plate member 12 extends from the left side edge of the second divided plate member 12. It stands almost vertically. However, each of the side walls 13b, 13d, 12d, and 12e may be erected in an inclined state in which the side walls 13b, 13d, 12d, and 12e are inclined outward as they go upward. Alternatively, it may be erected in an inclined state in which it is inclined slightly inward as it goes upward.

When the undercover 10 of the present embodiment is attached to the bogie frame 1, the edges 11a of the adjacent first divided plate members 11 are butted against each other, and the edge edges 12a of the adjacent second divided plate members 12 are butted against each other, The edge 11a of the first split plate member 11 and the edge 12a of the second split plate member 12 are butted against each other so that almost no gap is formed between them. The configuration is not limited to such a configuration, and for example, the adjacent edges 11a and 12a may be integrated with a welding material or the like made by melting resin. Also, a hinge structure may be formed between the adjacent edges 11a and 12a.

- The undercover 10 may be formed with a hole for draining rainwater or the like.
- The core layer 20 is not limited to being formed by folding and forming one sheet of the first sheet material 100 . For example, a plurality of strip-shaped sheets are bent at predetermined intervals to form the side walls of the cell, and sheet layers are placed on both upper and lower sides of these strip-shaped sheets to form the upper and lower walls of the cell. can be

- In the present embodiment, the hexagonal columnar cells S are partitioned and formed inside the core layer 20, but the shape of the cells S is not particularly limited. For example, it may have a polygonal shape such as a quadrangular prism shape, an octagonal prism shape, or a cylindrical shape. Moreover, the shape of the cell S may be a truncated cone shape. In that case, cells of different shapes may be mixed. Also, the cells do not have to be adjacent to each other, and there may be gaps (spaces) between the cells.

- The core layer 20 is not limited to one in which columnar cells S are partitioned. For example, sheet layers may be bonded to both upper and lower surfaces of a core layer having a predetermined irregular shape. Examples of the core layer having such a configuration include those described in JP-A-2014-205341. Alternatively, a plastic corrugated cardboard having a harmonica-shaped cross section may be used.

In the present embodiment, the single first sheet material 100 is folded and formed to form the core layer 20 as a honeycomb structure in which the hexagonal cells S are partitioned and formed inside the core layer 20. The method is not limited to this. For example, as described in Japanese Patent No. 4368399, a core layer 20 as a honeycomb structure may be formed by sequentially folding a three-dimensional structure having a plurality of rows of protrusions having a trapezoidal cross section. good.

- Although the laminate sheets 30 and 40 have a single-layer structure, they may have a multi-layer structure.
- As the thermoplastic resin constituting the core layer 20 and the laminate sheets 30 and 40, one to which various functional resins are added may be used. For example, by adding a flame-retardant resin to a thermoplastic resin, it is possible to enhance flame retardancy. Various functional resins can be added to all of the core layer 20 and laminate sheets 30 and 40, and at least one of the core layer 20 and laminate sheets 30 and 40 can be used. It is also possible to

- The laminate sheets 30 and 40 themselves may be composed of fiber layers, or the surfaces of the laminate sheets 30 and 40 may be further provided with fiber layers. For example, when ballast that has been rolled up hits the surface of the undercover 10 , the resin layer can prevent the resin forming the undercover 10 from scattering.

- The laminate sheets 30 and 40 themselves may be composed of impact-absorbing soft sheets, or the surfaces of the laminate sheets 30 and 40 may be further provided with impact-absorbing soft sheets. When the rolled-up ballast hits the surface of the undercover 10, the impact can be absorbed more effectively.

- The laminate sheets 30 and 40 themselves may be composed of thin metal plates such as aluminum.

DESCRIPTION OF SYMBOLS 1... Bogie frame 10... Under cover 11... 1st division|segmentation board material 12... 2nd division|segmentation board material 20... Core layer 30, 40... Laminate sheet 50... Fastening member 51... First supporting member 51a... First tubular portion 51b...First collar portion 51d...First holding hole (connecting hole) 52...Second supporting member 52a...Second tubular portion 52b...Second flange portion 52d...Second holding hole (connecting hole), 52f...step, 53...first damping rubber, 53e...insertion hole (connecting hole), 54...second damping rubber, 54a...insertion hole (connecting hole), 61...connecting rod, M... center point of the trolley.

Claims (2)

A fastening member for attaching an undercover to a railway bogie,
A support member that supports the upper surface and the lower surface of the undercover, and a damping rubber provided in the support member,
A connecting hole is formed in the support member and the damping rubber, into which a connecting rod provided on the truck is inserted ,
the support member comprises a first support member and a second support member;
The first support member includes a first tubular portion and a first brim extending outward from a lower end portion of the first tubular portion,
The second support member includes a second tubular portion and a second brim extending outward from a lower end portion of the second tubular portion,
The first flange supports the upper surface of the undercover, and the second flange supports the lower surface of the undercover,
When the support member supports the undercover, the top surface of the first brim portion is flush with the top surface of the undercover, and the bottom surface of the second brim portion is flush with the bottom surface of the undercover. fastening member . The second tubular portion can be inserted into the first tubular portion with its outer peripheral surface in contact with the inner peripheral surface of the first tubular portion,
The outer peripheral surface of the second tubular portion extends in parallel with the second flange portion and contacts the first tubular portion so that the second tubular portion can be inserted into the first tubular portion. A regulating step is formed,
When the first cylindrical portion is in contact with the step, the top surface of the first brim portion is flush with the top surface of the undercover, and the bottom surface of the second brim portion is flush with the bottom surface of the undercover. 2. The fastening member of claim 1, wherein the fastening member is flush.

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