WO2025234384A1 - Axlebox support device for railway vehicle truck - Google Patents

Abstract

This axlebox support device that is for a railway vehicle truck and that is equipped with a coil spring interposed between an upper surface of an axlebox and a truck frame, said device comprising: a support arm that protrudes from the axlebox on one side in the front-rear direction of the truck and supports the axlebox; a cylindrical laminated rubber that has an outer cylinder having a shaft line, a cylindrical rubber disposed inside the outer cylinder, and an axle disposed inside the cylindrical rubber and that is disposed on one side of the axlebox; a fixing tool that fixes the outer cylinder, which constitutes the outer circumferential surface of the cylindrical laminated rubber, to the truck frame in a state where the outer circumferential surface of the cylindrical laminated rubber is exposed; and a positioning part for positioning the axle on the support arm.

Description

Axle box support device for railway vehicle bogies

The present invention relates to an axle box support device for a railway vehicle bogie.

Patent Document 1 discloses an axle box support device for railway vehicles that includes an inner cylinder attached to the side beam so as to extend downward from the side beam, an axle box that supports the axle via bearings, and a support arm that extends from the axle box toward the inner cylinder in the longitudinal direction of the vehicle and surrounds the outer periphery of the inner cylinder, with support rubber provided between the inner cylinder and the support arm.

Japanese Patent Application Publication No. 5-238389

In the configuration disclosed in Patent Document 1, the support rubber is provided on the outside of the inner tube and inside the support arm, so when manufacturing the railway vehicle axle box suspension device, the support rubber needs to be attached to the inside of the tip of the support arm. In Patent Document 1, a mounting hole that penetrates vertically is provided at the tip of the support arm, and the support rubber is press-fitted into the inside of the mounting hole.

However, in Patent Document 1, the support rubber is press-fit into the mounting hole of the support arm, so a special device such as a press is required to attach the support rubber to the support arm. Therefore, the worker must carry the support rubber and support arm to the press or other device each time they perform the installation work, which can make the worker's work more complicated.

Therefore, one aspect of the present disclosure aims to facilitate the installation of axle box support devices on railway vehicle bogies equipped with coil springs interposed between the upper surface of the axle box and the bogie frame.

The axle box support device for a railway vehicle bogie disclosed herein is an axle box support device for a railway vehicle bogie equipped with a coil spring interposed between the upper surface of the axle box and the bogie frame, and includes a support arm that protrudes from the axle box on one side in the fore-and-aft direction of the bogie and supports the axle box, an outer tube having an axis, tubular rubber arranged inside the outer tube, and a mandrel arranged inside the tubular rubber, and is equipped with a cylindrical laminated rubber arranged on the one side of the axle box, a fixing device that fixes the outer tube that forms the outer peripheral surface of the cylindrical laminated rubber to the bogie frame with the outer peripheral surface of the cylindrical laminated rubber exposed, and a positioning part that positions the mandrel on the support arm.

According to the present disclosure, the outer tube is fixed to the bogie frame with the outer peripheral surface of the cylindrical rubber bearing exposed, and the cylindrical rubber bearing is fixed to the bogie frame without being pressed in. As a result, the cylindrical rubber bearing is fixed to the bogie frame without using special equipment such as a press. Since there is no need to transport the cylindrical rubber bearing to special equipment such as a press when fixing the cylindrical rubber bearing to the bogie frame, workers can assemble the bogie more easily.

FIG. 2 is a side view of a bogie of a railway vehicle. FIG. 2 is a side view of the axle box support device of the bogie of FIG. 1 . FIG. 3 is a plan view of the axle box support device of FIG. 2; 3 is a cross-sectional view taken along a plane extending in the longitudinal and vertical directions in the cylindrical laminated rubber of the axle box support device of FIG. 2. FIG. 2 is a cross-sectional view of a modified axle box support device of FIG. 1 taken along a horizontal plane of a portion where the mandrel is attached to the support arm. FIG. 10 is a side view of a portion of another modified example of the axle box support device of FIG. 1 where the closure plate abuts from below on the lower surface of the support arm. 1 的另一变形的视图，显示了支撑臂的下面对应于以下的部分。 FIG. 1 another modification of the axle box support device, shows a side view of the support arm from below the lower surface of the closure plate abutting.

Embodiments will be described below with reference to the drawings. In the following description, the direction in which the railway vehicle travels and in which the car body extends is the longitudinal direction of the vehicle, which is the fore-and-aft direction of the vehicle, and the lateral direction perpendicular to this is the transverse direction of the vehicle, which is the left-right direction of the vehicle.

Figure 1 is a side view of the bogie 2 of a railway vehicle 1. Figure 2 is an enlarged side view of the front axle box suspension device in the fore-and-aft direction of the bogie 2 of Figure 1. As shown in Figures 1 and 2, the railway vehicle 1 comprises the bogie 2, a carbody 3, and air springs 4 arranged between the bogie 2 and the carbody 3. In this embodiment, the air springs 4 function as secondary suspension. The bogie 2 comprises a bogie frame 5 that supports the carbody 3 via the air springs 4.

A pair of wheel sets 6 are arranged on both sides of the bogie frame 5 in the longitudinal direction of the vehicle. The wheel sets 6 have an axle 6a extending along the vehicle width direction and wheels 6b provided on both sides of the axle 6a in the vehicle width direction. A brake 7 is arranged opposite the tread of the wheel 6b, and presses the tread of the wheel 6b from the inside toward the outside in the longitudinal direction of the vehicle, slowing down and stopping the rotation of the wheel 6b.

The bogie 2 is equipped with an axle box suspension 8. The axle box suspension 8 is attached to the bogie 2 and supports an axle box 9. The axle box 9 houses a bearing 10 that supports the axle 6a. The axle box suspension 8 includes a coil spring 12. The axle box 9 is connected to the bogie frame 5 via the coil spring 12 of the axle box suspension 8. In other words, the coil spring 12 is interposed between the bogie frame 5 and the axle box 9. In this embodiment, the coil spring 12 functions as a primary suspension.

Figure 2 is an enlarged side view of the front axle box support device 8 of the bogie 2 shown in Figure 1 in the longitudinal direction, and also shows a portion of the internal structure of the axle box 9. As shown in Figure 2, the axle box support device 8 comprises a coil spring 12, a support arm 13, and a cylindrical laminated rubber 14. The coil spring 12 is interposed between the upper surface 9a of the axle box 9 and the bogie frame 5. The support arm 13 protrudes from the axle box 9 toward the center of the bogie 2 in the longitudinal direction of the vehicle, and supports the axle box 9.

The bogie frame 5 has a side beam 15 and a receiving seat 16 that protrudes downward from the underside of the side beam 15. In this embodiment, the receiving seat 16 is fixedly attached to the underside of the side beam 15 by welding. The receiving seat 16 may also be attached to the side beam 15 by a method other than welding. For example, the receiving seat 16 may be attached to the side beam 15 by bolting. A cylindrical laminated rubber 14 is attached to the lower part of the receiving seat 16. The cylindrical laminated rubber 14 has an outer tube 17 on the radial outside. In this embodiment, the outer tube 17 of the cylindrical laminated rubber 14 has a tab 18 that protrudes horizontally outward from the outer surface 17a. In addition, the receiving seat 16 of the bogie frame 5 has a tab 19 that protrudes horizontally outward beyond the outer surface 17a of the outer tube 17 of the cylindrical laminated rubber 14 and overlaps the tab 18 of the outer tube 17. The axle box support device 8 also has bolts 20 that fasten the tabs 19 of the receiving seats 16 to the tabs 18 of the cylindrical laminated rubber 14. The tabs 19 of the receiving seats 16 and the tabs 18 of the outer cylinders 17 of the cylindrical laminated rubber 14 are fastened together by the bolts 20, attaching the cylindrical laminated rubber 14 to the side beams 15.

Figure 3 shows an enlarged plan view of the front axle box support device 8 in the fore-and-aft direction of the bogie frame 5. As shown in Figure 3, in this embodiment, two tabs 19 are provided on the support seat 16 at the front of the bogie frame 5. That is, the tabs 19 of the support seat 16 are provided on both the outer and inner sides of the side sill 15 in the left-right direction. The two tabs 19 are provided symmetrically with respect to the central axis L1 of the cylindrical laminated rubber 14. As shown in Figure 2, the cylindrical laminated rubber 14 is provided with two tabs 18 corresponding to the two tabs 19 of the support seat 16. Therefore, the cylindrical laminated rubber 14 also has two tabs 18 provided symmetrically with respect to the central axis L1. A through hole is provided in the tab 19 of the support seat 16, and a screw hole is provided in the tab 18 of the outer cylinder 17 of the cylindrical laminated rubber 14. Bolts 20 fasten the outer tube 17 that forms the outer surface of the cylindrical rubber bearing 14 to the bogie frame 5, fixing the cylindrical rubber bearing 14 to the bogie frame 5. In other words, in this embodiment, the bolts 20 function as fasteners that fasten the tabs 19 of the seat 16 and the tabs 18 of the cylindrical rubber bearing 14 together.

Figure 4 is a cross-sectional view of the cylindrical rubber bearing 14 of the axle box support device 8 of Figure 2, taken along a plane that passes through the central axis L1 and extends in the longitudinal and vertical directions. In addition to the outer tube 17, the cylindrical rubber bearing 14 has a tubular rubber 21 and a core 22. In this embodiment, the outer tube 17 and the core 22 are made of metal. The cylindrical rubber bearing 14 is positioned toward the center of the bogie in the longitudinal direction of the vehicle relative to the axle box 9. The outer tube 17 has an axis L1 that extends vertically, which is the same as the central axis L1 of the cylindrical rubber bearing 14, and extends along the vertical direction.

The tubular rubber 21 is arranged radially inside the outer tube 17. In this embodiment, multiple tubular bodies 23 are provided radially inside the outer tube 17 and radially outside the mandrel 22. In this embodiment, the tubular bodies 23 are formed from metal. Two tubular bodies 23 are provided radially between the outer tube 17 and the mandrel 22. Also, in this embodiment, multiple tubular rubbers 21 are provided radially inside the outer tube 17 and radially outside the mandrel 22. Three tubular rubbers 21 are provided radially between the outer tube 17 and the mandrel 22. The three tubular rubbers 21 are provided between the outer tube 17 and the tubular bodies 23, between the tubular bodies 23, and between the tubular bodies 23 and the mandrel 22. Between the outer tube 17 provided radially outside and the mandrel 22 provided radially inside, tubular bodies 23 made of metal and tubular rubbers 21 are alternately stacked radially. The tubular rubber 21 is vulcanization bonded to the outer tube 17, tubular body 23, or mandrel 22.

The mandrel 22 is positioned radially inside the tubular rubber 21. The mandrel 22 has an axis L1 that extends vertically and is the same as the central axis L1 of the cylindrical laminated rubber 14, and extends along the vertical direction. The mandrel 22 has two screw holes 24. The screw holes 24 extend vertically upward from the lower end 22a, which is the end of the mandrel 22. Except for the lower part where the screw holes 24 are formed, the mandrel 22 has a hollow shape with an internal space defined along the central axis L1. The internal space of the mandrel 22 is open at the top and closed at the bottom. At the top of the mandrel 22, the inner surface 22b slopes outward as it extends upward, and the radial thickness becomes thinner as it approaches the upper end 22c.

The support arm 13 has a through hole 13a that is open in the vertical direction. The lower end 22a of the mandrel 22 is inserted into the through hole 13a of the support arm 13 from above. A closure plate 25 is arranged below the through hole 13a of the support arm 13. The closure plate 25 is separate from the mandrel 22. The closure plate 25 is larger than the through hole 13a and interferes with the portion of the support arm 13 surrounding the through hole 13a from below. The closure plate 25 has a through hole 25a that is open in the vertical direction. The support arm 13 is arranged above the through hole 13a and has a recess 13b that is larger in diameter than the through hole 13a and is open upward. In other words, the through hole 13a extends downward from the bottom of the recess 13b. With the closure plate 25 abutting the underside of the support arm 13, a bolt 26 is inserted into the through hole 25a of the closure plate 25 from below. The bolt 26 is fastened to the threaded hole 24 of the axle 22. By fitting the bolt 26 into the through-hole 13a of the axle 22, horizontal displacement of the axle 22 relative to the support arm 13 is restricted, and by abutting the closure plate 25 against the support arm 13, vertical displacement of the axle 22 relative to the support arm 13 is restricted.

As described above, the closure plate 25 abuts from below against the underside of the support arm 13, which serves as the end face of the through hole 13a. With the underside of the support arm 13 abutting against the closure plate 25, the bolt 26 passes through the through hole 25a of the closure plate 25 from below the support arm 13 and is fastened to the lower end 22a of the mandrel 22. Therefore, the closure plate 25 abutting against the support arm 13 from below and the bolt 26 fastened to the mandrel 22 function as a positioning part that positions the lower end 22a of the mandrel 22 on the support arm 13.

The axle box support device 8 has a base 27 interposed between the support arm 13 and the mandrel 22. The base 27 is housed in the recess 13b of the support arm 13. The mandrel 22 has a lower end shaft portion 22e as a first shaft portion inserted into the through hole 13a of the support arm 13, and an intermediate shaft portion 22d as a second shaft portion positioned above the lower end shaft portion 22e and having a larger diameter than the lower end shaft portion 22e. When the mandrel 22 is inserted into the through hole 13a of the support arm 13, the lower end shaft portion 22e of the mandrel 22 is inserted into the through hole 13a, and the intermediate shaft portion 22d of the mandrel 22 protrudes upward from the through hole 13a and is not inserted into the through hole 13a.

The diameter of the mandrel 22 changes at the boundary between the intermediate shaft portion 22d and the lower end shaft portion 22e, and a step 22f is formed on the outer surface. The base 27 abuts against the step 22f at the boundary between the intermediate shaft portion 22d and the lower end shaft portion 22e on the outer surface of the mandrel 22. By abutting against the outer surface of the mandrel 22, the load on the mandrel 22 is supported by the support arm 13 via the base 27. As the mandrel 22 is supported from below by the support arm 13 via the base 27, the cylindrical laminated rubber 14 is supported from below by the support arm 13. The area surrounding the through hole 13a of the support arm 13 is sandwiched vertically between the step 22f of the mandrel 22 and the closure plate 25.

As shown in Figure 4, the upper portion 16a and lower portion 16b of the receiving seat 16 have different diameters. The upper portion 16a has a larger diameter than the lower portion 16b. The outer diameter of the outer tube 17 of the cylindrical laminated rubber 14 is approximately the same as the outer diameter of the upper portion 16a of the receiving seat 16, and the inner diameter is approximately the same as the outer diameter of the lower portion 16b of the receiving seat 16. Therefore, when the upper end surface 17b of the outer tube 17 is brought into contact with the lower end surface of the upper portion 16a of the receiving seat 16, the inner surface of the outer tube 17 comes into contact with the outer surface of the lower portion 16b of the receiving seat 16, and the upper end portion 17c, which serves as the end portion of the outer tube 17 of the cylindrical laminated rubber 14, fits into the receiving seat 16 from below.

When the outer tube 17 of the cylindrical laminated rubber 14 is fixed to the bogie frame 5 with bolts 20 and the axle 22 is positioned and fixed to the support arm 13 with bolts 26, the outer surface 28 of the cylindrical laminated rubber 14 is exposed.

Furthermore, by placing one or more shim plates in the vertical gap between the recess 13b of the support arm 13 and the underside of the base 27, it is possible to adjust the load transmitted to the bogie frame 5 in accordance with individual differences in the coil springs 12. This makes it possible to minimize load imbalances caused by individual differences in the coil springs 12 provided on the bogie frame 5.

In the railway vehicle 1 configured as described above, when the carbody 3 is displaced in the vertical direction, the coil springs 12 and the tubular rubber 21 in the cylindrical rubber laminate 14 are displaced while elastically deforming, allowing the coil springs 12 and the tubular rubber 21 to absorb kinetic energy in the vertical direction. Furthermore, with regard to horizontal displacement, the tubular rubber 21 in the cylindrical rubber laminate 14 is displaced while elastically deforming, allowing the tubular rubber 21 to absorb kinetic energy in the horizontal direction.

With the above configuration, the outer tube 17 is fixed to the bogie frame 5 with the outer peripheral surface 28 of the cylindrical rubber bearing 14 exposed, and the cylindrical rubber bearing 14 is fixed to the bogie frame 5 without being press-fitted. Therefore, the cylindrical rubber bearing 14 is fixed to the bogie frame 5 without using special equipment such as a press. Since there is no need to transport the cylindrical rubber bearing 14 to a special device such as a press when fixing the cylindrical rubber bearing 14 to the bogie frame 5, workers can more easily assemble the bogie 2. Furthermore, since there is no need to use special equipment such as a press when assembling the bogie 2, the manufacturing costs of the bogie 2 can be kept low. Furthermore, during maintenance of the bogie 2, the cylindrical rubber bearing 14 can be easily replaced by removing the cylindrical rubber bearing 14 from the bogie frame 5 and support arm 13 and attaching a new cylindrical rubber bearing 14 to the bogie frame 5 and support arm 13.

Furthermore, the axle 22 is inserted into the through-hole 13a of the support arm 13, the closure plate 25 is abutted against the support arm 13 from below the through-hole 13a, and the closure plate 25 is clamped from below and fastened to the lower end 22a of the axle 22 by the bolt 26. As a result, the axle 22 can be securely and easily positioned and fixed to the support arm 13 without having to be press-fitted into the support arm 13. Furthermore, no special equipment such as a press is required to attach and detach the axle 22 from the support arm 13, which helps keep the manufacturing costs of the bogie 2 low.

Furthermore, because the cylindrical rubber bearing 14 is supported by the support arm 13 via the base 27, the cylindrical rubber bearing 14 can be stably supported. Furthermore, because the upper end 17c of the outer tube 17 fits into the receiving seat 16 of the bogie frame 5 from below, the outer tube 17 can be temporarily fixed to the receiving seat 16 by fitting, and then fixed by bolts between the outer tube 17 and the receiving seat 16. Therefore, workers assembling or maintaining the bogie 2 can easily fix the outer tube 17 to the receiving seat 16. Furthermore, because the outer tube 17 is fixed to the bogie frame 5 by fastening the tab 19 of the receiving seat 16 of the bogie frame 5 and the tab 18 of the outer tube 17 of the cylindrical rubber bearing 14 with the bolt 20, the outer tube 17 can be easily fixed to the bogie frame 5.

Furthermore, the axle box support device 8 of this embodiment allows the cylindrical rubber bearing 14 to displace more vertically than an axle-beam type axle box support device. Therefore, as the coil spring 12 displaces vertically, the tubular rubber 21 displaces relative to the outer tube 17, and the axle 22 displaces in the same manner as the coil spring 12. In this case, the tubular rubber 21 of the cylindrical rubber bearing 14 displaces significantly, allowing the cylindrical rubber bearing 14 to absorb a large amount of vertical displacement. Therefore, when the rear end of the support arm 13 in the fore-and-aft direction is displaced due to displacement of the axle 22, it is not necessary to rotate the support arm 13 to absorb the vertical displacement. This allows the fore-and-aft length of the support arm 13 to be shortened. Because the support arm 13 can be shortened, the brake 7 is exposed to the outside in the left-right direction. Therefore, the ease of operation by the maintenance worker during maintenance of the bogie 2 can be improved.

Furthermore, compared to axle beam-type axle box suspension, the cylindrical rubber bearings 14 are attached to the bogie frame 5 and support arms 13 by fastening the tabs 19 of the bearing seats 16 to the tabs 18 of the outer cylinder 17 with bolts 20, and by fastening the support arms 13 to the axle rods 22 with bolts 26. This eliminates the need to use special structures, such as wedges, to attach the cylindrical rubber bearings 14 to the bogie frame 5 or support arms 13. Generally, when an axle box suspension uses wedges to attach the axle box to the bogie frame, special tools are required to remove the axle box from the bogie frame for maintenance. Furthermore, each time the axle box is removed from the bogie frame, wear and deformation occur at the locations where the wedges are placed, which can affect the durability of the axle box suspension.

In the above embodiment, a configuration has been described in which the tabs on the outer tube of the cylindrical rubber bearing and the tabs on the seat of the bogie frame are fastened together with bolts. In other words, a configuration has been described in which the fastener is a bolt. Also, a configuration has been described in which the closure plate abuts the underside of the support arm from below, and the bolt fastens the closure plate to the lower end of the axle from below, thereby fixing the axle to the support arm. In other words, a configuration has been described in which the positioning part is a closure plate and a bolt. However, this is not limited to the above embodiment. The fastener and positioning part may have a different configuration. As long as the cylindrical rubber bearing is attached to the bogie frame and the cylindrical rubber bearing is attached to the support arm, the fastener and positioning part may have a different configuration.

Furthermore, in the above embodiment, a cylindrical mandrel 22 is inserted into the through hole 13a in the support arm 13, and the through hole 13a has a circular cross section along a horizontal plane. However, this is not limited to the above embodiment. The mandrel 22 and the support arm 13 may include a rotation prevention structure 30 that inhibits rotation of the mandrel 22 around the axis of the through hole 13a. For example, the mandrel 22 may have a side surface formed on its outer periphery that prevents rotation around the axis of the through hole 13a, and a side surface formed on the outer periphery of the through hole 13a that prevents rotation around the axis. Figure 5 shows a cross-sectional view of a horizontal cross section of the mandrel 22 and support arm 13 in a modified example. In the example of Figure 5, a side surface 22g extending in the width direction and up and down is provided on one side of the outer periphery of the mandrel 22, facing the axle box 9 in the front-to-rear direction. Furthermore, the through hole 13a in the support arm 13 also has a side surface 13d extending in the width direction and up and down, corresponding to the side surface 22g of the mandrel 22. In the example shown in Figure 5, the through hole 13a of the support arm 13 has a side surface 13d extending in the width direction and up and down on the axle box 9 side in the front-to-rear direction.

In the configuration of Figure 5, the mandrel 22 has a side surface 22g extending in the width direction and vertical direction on its outer periphery, and the through hole 13a of the support arm 13 has a side surface 13d extending in the width direction and vertical direction. As a result, the cross section of the mandrel 22 along the horizontal plane is not circular, and the cross section of the through hole 13a of the support arm 13 along the horizontal plane is not circular. Therefore, when attaching the axle box 9 to the cylindrical rubber bearing 14, the mandrel 22 can be prevented from rotating around the axis of the through hole 13a inside the through hole 13a and becoming misaligned. This makes it possible to easily attach the axle box 9 to the cylindrical rubber bearing 14. Note that Figure 5 describes a configuration in which the mandrel 22 has a side surface 22g extending in the width direction and vertical direction on the axle box 9 side in the front-to-rear direction, and the through hole 13a has a side surface 13d extending in the width direction and vertical direction on the axle box 9 side in the front-to-rear direction, but this is not limited to the above embodiment. The position of side surface 22g on the axle 22 and the position of side surface 13d on the through hole 13a do not have to be on the axle box 9 side in the fore-and-aft direction. They may be on the brake 7 side in the fore-and-aft direction. As long as the cross section of the axle 22 and through hole 13a taken along the horizontal plane is not circular, thereby preventing rotation of the axle 22 about the axis of the through hole 13a, side surface 22g may be located anywhere on the outer periphery of the axle 22, and side surface 13d may be located anywhere on the through hole 13a.

In addition, in the above embodiment, the lower tip of the portion of the support arm 13 that supports the cylindrical laminated rubber 14 is cylindrical, and the through hole 13a of the support arm 13 is closed from below by a disk-shaped closure plate 25, but this is not limited to the above embodiment. The support arm 13 and the closure plate 25 may include a rotation prevention structure 31 that prevents the closure plate 25 from rotating relative to the support arm 13 around the axis of the through hole 13a. Figure 6 shows a side view of the support arm 13 and the closure plate 25 in another modified example, at the portion where the closure plate 25 abuts against the underside of the support arm 13 from below. In the example of Figure 6, the closure plate 25 is provided with a convex portion 25b that protrudes upward, the support arm 13 is provided with a concave portion 13h, and the convex portion 25b of the closure plate 25 and the concave portion 13h of the support arm 13 fit together. Because the convex portion 25b and the concave portion 13h fit together between the support arm 13 and the closure plate 25, rotation of the closure plate 25 relative to the support arm 13 around the axis of the through hole 13a is prevented. That is, the closure plate 25 and the support arm 13 have the convex portion 25b and the concave portion 13h as a rotation prevention structure 31 that inhibits rotation of the axle 22 fastened to the closure plate 25 around the axis of the through hole 13a. This prevents the axle 22 fixed to the closure plate 25 from rotating around the axis of the through hole 13a. Furthermore, when attaching the closure plate 25 to the support arm 13, misalignment between the closure plate 25 and the support arm 13 is prevented. This makes it easier to attach the closure plate 25 to the support arm 13.

Furthermore, Figure 7 shows a side view of the support arm 13 and closure plate 25 in a further modified example, showing a rotation prevention structure 32 at the portion where the closure plate 25 abuts the underside of the support arm 13 from below. In the example of Figure 7, a downwardly protruding convex portion 13k is provided on the support arm 13, a concave portion 25c is provided on the closure plate 25, and the convex portion 13k of the support arm 13 and the concave portion 25c of the closure plate 25 fit together. This also achieves the same effect as Figure 6. In this way, the rotation prevention structure 32 for the closure plate 25 and support arm 13 may be a combination of the downwardly protruding convex portion 13k on the support arm 13 and the concave portion 25c of the closure plate 25.

In the above embodiment, the central axis L1 of the cylindrical laminated rubber 14, the axis L1 of the outer tube 17, and the axis L1 of the mandrel 22 extend vertically. However, this is not limited to this, and the central axis L1 and the axis L1 may extend horizontally or in another direction. Accordingly, for example, the arrangement of the closure plate 25 and bolt 26 of the positioning portion, the through hole 13a and recess 25c of the support arm 13, the tab 18 of the outer tube, and the seat 16 and tab 19 of the bogie frame 5 may be changed as appropriate. For example, the mandrel 22 may have a first shaft portion inserted into the through hole 13a and a second shaft portion having a larger diameter than the first shaft portion, and the support arm 13 may be located on the side of the through hole 13a closer to the second shaft portion, have a larger diameter than the through hole 13a, and have a recess 25c that opens toward the second shaft portion. That is, for example, the through hole 13a and recess 25c of the support arm 13 may be open horizontally or in another direction, and the first shaft portion of the mandrel 22 may be inserted into such through hole 13a, and the base 27 may be housed in such recess 25c.

As stated above, the above embodiments have been described as examples of the technology disclosed in this application. However, the technology disclosed herein is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate. It is also possible to combine the components described in the above embodiments to create new embodiments. For example, some of the configuration or methods in one embodiment may be applied to another embodiment, and some of the configuration in an embodiment can be separated from other configurations in that embodiment and extracted as desired. Furthermore, the components described in the accompanying drawings and detailed description include not only components essential for solving the problem, but also components that are not essential for solving the problem and are used to illustrate the technology.

Each of the following items discloses a preferred embodiment.

[Item 1]
An axle box support device for a bogie of a railway vehicle, comprising a coil spring interposed between an upper surface of an axle box and a bogie frame,
a support arm that protrudes from the axle box on one side in the front-rear direction of the bogie and supports the axle box;
a cylindrical laminated rubber member having an outer cylinder having an axis, a tubular rubber member disposed inside the outer cylinder, and a mandrel disposed inside the tubular rubber member, the laminated rubber member being disposed on the one side of the axle box;
a fastener for fastening the outer cylinder constituting the outer peripheral surface of the cylindrical laminated rubber to the bogie frame in a state in which the outer peripheral surface of the cylindrical laminated rubber is exposed;
a positioning portion that positions the axle on the support arm.

[Item 2]
The support arm has a through hole;
an end of the mandrel inserted into the through hole of the support arm;
2. The axle box support device for a bogie of a railway vehicle according to claim 1, wherein the positioning portion includes a closure plate that abuts against an end surface of the support arm, and a bolt that fastens the closure plate to the end of the mandrel.

[Item 3]
a base interposed between the support arm and the mandrel;
The mandrel has a first shaft portion inserted into the through hole and a second shaft portion having a larger diameter than the first shaft portion,
the support arm further includes a recessed portion that is disposed in the through hole on a side closer to the second shaft portion, has a larger diameter than the through hole, and is open toward the second shaft portion;
The base is accommodated in the recess of the support arm,
3. The axle box support device for a bogie of a railway vehicle according to item 2, wherein the second shaft portion of the mandrel is supported by the support arm via the base, thereby supporting the cylindrical laminated rubber bearing by the support arm.

[Item 4]
the bogie frame has a side beam and a receiving seat protruding from the side beam,
4. The axle box support device for a bogie of a railway vehicle according to any one of items 1 to 3, wherein an end of the outer cylinder of the cylindrical laminated rubber is fitted into the seat.

[Item 5]
The outer cylinder of the cylindrical laminated rubber has a tab protruding outward,
the bogie frame has a tab that protrudes outward and overlaps the tab of the outer cylinder;
5. The axle box support device for a bogie of a railway vehicle according to any one of items 1 to 4, wherein the fastener fastens the tab of the outer tube to the tab of the bogie frame.

[Item 6]
4. The axle box support device for a bogie of a railway vehicle according to item 2 or 3, further comprising a rotation prevention structure that inhibits rotation of the axle around the axis of the through hole.

REFERENCE SIGNS LIST 1 Railway vehicle 2 Bogie 3 Carbody 4 Air spring 5 Bogie frame 8 Axle box support device 9 Axle box 10 Bearing 12 Coil spring 13 Support arm 13a Through hole 14 Cylindrical laminated rubber 15 Side beam 16 Receiver 17 Outer cylinder 17c Upper end 18 Tab 19 Tab 20 Bolt 21 Cylindrical rubber 22 Axle 22a Lower end 23 Cylindrical body 25 Closure plate 26 Bolt 27 Base 28 Outer circumferential surface

Claims (6)

An axle box support device for a bogie of a railway vehicle, comprising a coil spring interposed between an upper surface of an axle box and a bogie frame,
a support arm that protrudes from the axle box on one side in the front-rear direction of the bogie and supports the axle box;
a cylindrical laminated rubber member having an outer cylinder having an axis, a tubular rubber member disposed inside the outer cylinder, and a mandrel disposed inside the tubular rubber member, the laminated rubber member being disposed on the one side of the axle box;
a fastener for fastening the outer cylinder constituting the outer peripheral surface of the cylindrical laminated rubber to the bogie frame in a state in which the outer peripheral surface of the cylindrical laminated rubber is exposed;
a positioning portion that positions the axle on the support arm. The support arm has a through hole;
an end of the mandrel inserted into the through hole of the support arm;
2. The axle box support device for a bogie of a railway vehicle according to claim 1, wherein the positioning portion includes a closure plate that abuts against an end surface of the support arm, and a bolt that fastens the closure plate to the end of the mandrel. a base interposed between the support arm and the mandrel;
The mandrel has a first shaft portion inserted into the through hole and a second shaft portion having a larger diameter than the first shaft portion,
the support arm further includes a recessed portion that is disposed in the through hole on a side closer to the second shaft portion, has a larger diameter than the through hole, and is open toward the second shaft portion;
The base is accommodated in the recess of the support arm,
3. The axle box support device for a bogie of a railway vehicle according to claim 2, wherein the second shaft portion of the mandrel is supported by the support arm via the base, thereby supporting the cylindrical laminated rubber bearing by the support arm. the bogie frame has a side beam and a receiving seat protruding from the side beam,
2. The axle box support device for a bogie of a railway vehicle according to claim 1, wherein an end of the outer cylinder of the cylindrical laminated rubber is fitted into the seat. The outer cylinder of the cylindrical laminated rubber has a tab protruding outward,
the bogie frame has a tab that protrudes outward and overlaps the tab of the outer cylinder;
5. The axle box support device for a bogie of a railway vehicle according to claim 1, wherein the fastener fastens the tab of the outer cylinder to the tab of the bogie frame. 4. The axle box support device for a bogie of a railway vehicle according to claim 2, further comprising a rotation prevention structure that inhibits rotation of the axle around the axis of the through hole.