JP6076845B2 - Pedal arm - Google Patents

Description

  The present invention relates to a pedal arm used for a brake pedal or a clutch pedal of an automobile.

  A pedal arm used for a brake pedal or a clutch pedal of an automobile is an operation member that transmits a rotational motion obtained by stepping on a driver's foot to a braking device or a clutch device. Conventional pedal arms are often constructed by attaching a foot pad to the lower end of an arm body in which one metal bar or one metal plate is appropriately folded in the front-rear direction or the left-right direction. However, in recent years, weight reduction has been demanded as one of the members constituting an automobile, and a pedal arm is configured by attaching a foot pad to the lower end of an arm body that is a hollow member made of sheet metal. (Patent Documents 1 to 3).

  In Patent Document 1, for example, another sheet metal member (pedal element) pressed into a predetermined shape is aligned in the middle, and each of the front edge and the rear edge of the sheet metal member is clinched and further crimped and integrated. A pedal arm for attaching a foot pad to the lower end of the arm body is disclosed (Patent Document 1, [Claim 1] and others). In the caulking process, the caulking engaging portion is intermittently formed with respect to the clinching process that continues along the front edge or the rear edge of the sheet metal member (Patent Document 1, [Claim 2] and others). The caulking engagement portion has, for example, a shape equal to the width of the clinch peripheral portion, and has a trapezoidal shape in plan view in which the recessed end surface can be looked into the inner end edge and the copied outer edge of the folded outer winding edge portion (Patent Documents 1 and [ (Claim 3) [0012] to [0017] [FIG. 1] to [FIG. 8]).

  In Patent Document 2, for example, one sheet metal member (a pair of halved members) that has been pressed into a predetermined shape and connected via a connection portion is bent at the connection portion, and the flange portion of the sheet metal member is aligned. A pedal arm (arm component for a vehicle) is disclosed in which a foot pad is attached to the lower end of an arm main body that is integrated with a joint formed by deforming at least one of both flange portions by contacting each other (Patent Document 2). [Claim 1] and others). The coupling portion may be clinching (Patent Document 2, [Claim 2], etc.) or caulking (Patent Document 2, [Claim 4], etc.).

  Patent Document 3 is provided with a bulging portion (falling wall portion) at least partially in contact with the left and right side surfaces (left wall portion and right wall portion) of a hollow arm body (arm body portion) made of sheet metal. A pedal arm for attaching a foot pad to the lower end of the arm body is disclosed (Patent Document 3, [Claim 1] and others). The bulging part includes symmetrical bead parts (Patent Document 3, [Claim 3], etc. [FIG. 3] (b)) and the entire (Patent Document 3, [Claim 4], etc., [FIG. 13] (b )). The arm body is configured by folding the left and right side surfaces forward from the front surface (front wall portion) facing the rear of the vehicle and abutting the edges of the side surfaces on the rear surface (rear wall portion) facing the front of the vehicle (patent) Document 3 [0035] [FIG. 3]). The front and rear surfaces have a semicircular arc shape (including a parabolic shape) that is symmetrical in the longitudinal direction.

  The bulging part functions as a relief part when the member is deformed during bending of the arm body that bends in the rear direction or the left-right direction of the vehicle, and suppresses deformation such that the contact part of the edge on the rear surface is separated. Or it is supposed to prevent (Patent Document 3, [0058]). In addition, the abutment of the entire bead portion and the bulging portion functions to form the arm body while positioning it easily and reliably when forming the curved portion, and to increase the shape accuracy during mass production while improving the strength ( Patent Document 3 [0021] [0022]).

JP 2010-086052 JP JP 2011-227738 A JP 2010-247757 A

  The pedal arm that attaches the foot pad to the lower end of the arm body, which is a sheet metal hollow member disclosed in Patent Document 1 and below, can select a lighter material or reduce the thickness of the material for further weight reduction. It is possible to make it thinner. Also in this case, the arm main body is required to have a necessary and sufficient strength or rigidity that does not deform during a stepping operation or bending. From now on, the pedal arm which attaches a foot pad to the lower end of the arm body which is a hollow member made of a sheet metal for which weight reduction is pursued is bulged in a facing relationship from the left and right side surfaces as seen in Patent Document 3. A structure in which at least a part of the pair of bulging portions is brought into contact with each other and necessary and sufficient strength or rigidity is secured by the contact of the bulging portions is desirable (Patent Documents 3 [0058] [0021] [0022]).

  The bulging portion may be a semicircular cross section formed by a continuous curved surface or a square cross section formed by a plurality of (usually three) planes. From the viewpoint of improving rigidity, it is desirable to have a square bulge that can easily increase the section modulus.However, since plastic deformation is blocked at the corner where adjacent planes intersect, the bulge with a square cross section can be made too deep. Can not. For this reason, if the space between the left and right side surfaces is narrow, both the pair of bulging portions are brought into contact with each other as a square cross section (Patent Document 3, [Claim 4] and [FIG. 13] (b)) If the space between the left and right side surfaces is wide, both the bulging portions to be paired have a square cross section, and a cross-sectional semicircular arc shaped bead formed on each bulging portion is abutted (Patent Document 3, [Claim 3] and others, [FIG. 3] (b)).

  As described above, when the bulged portion having a square cross section is used, a restriction is imposed on the distance between the left and right side surfaces. This brings about the problem which impairs the design freedom of the pedal arm which attaches a foot pad to the lower end of the arm main body which is a sheet metal hollow member. In addition, when a semicircular arc-shaped bead is provided on the bulged portion having a square cross section, the left and right side surfaces can be widened, and the bead having a semicircular cross section is abutted by line contact. There is a need to increase accuracy. By forming a bulging portion that is narrower than the side surface and forming a bead that is narrower than the bulging portion, the bead has to be narrower and is provided in each of the bulging portions that form a pair. If the formation position of the bead is not correct, the bead cannot be abutted well, and the meaning of providing the bulging portion may be impaired.

  Therefore, even in the pedal arm where the foot pad is attached to the lower end of the arm body, which is a hollow member made of sheet metal, even if the remaining weight or thickness is reduced for further weight reduction, the foot operation and bending While adopting a structure in which a pair of bulging portions bulged in a facing relationship from the left and right side surfaces are in contact with each other so as to ensure a necessary and sufficient strength or rigidity that does not deform during processing, The structure or configuration of the bulging portion was studied so that there is no restriction on the distance between the side surfaces for abutting or butting, and the abutting or butting can be reliably performed without increasing the molding accuracy.

  The pedal arm that has been developed as a result of the study is a pedal arm that attaches a foot pad to the lower end of the arm body, which is a sheet metal hollow member. One of the bulges has a square cross section having a plane parallel to the side surface, and the other of the bulges has a semicircular arc cross section projecting along the normal direction of the plane. The pedal arm is characterized in that a bulging portion having a semicircular cross section is brought into line contact with the plane of the portion. The “plane parallel to the side surface” of the bulged portion having a square cross section includes not only a plane completely parallel to the side surface but also a gently inclined surface or curved surface that is substantially parallel to the side surface. Further, the bulging portion having a semicircular cross section is a convex portion having a semicircular arc shape formed by a smoothly continuous curved surface, and includes a parabolic cross section.

  In the pedal arm of the present invention, one of the pair of bulging portions protruding from the left and right side surfaces of the arm main body in a facing relationship has a square cross section and the other has a semicircular cross section. The ridgeline of the bulging portion having a semicircular cross section (a line in which the most protruding vertices are connected) can be surely brought into line contact. In this way, by securely bringing the pair of bulging portions into contact with each other, the arm main body can ensure a necessary and sufficient strength or rigidity that is not deformed during a stepping operation or bending. Since the ridge line of the bulged portion having a semicircular cross section may be brought into line contact with the plane of the bulged portion having a square cross section, the bulged portions may have different external shapes in side view. In addition, each bulging part usually extends along the center line of each side surface, but the ridge line of the bulging part having a semicircular arc section is bent or meandering within the plane of the bulging part having a square cross section. You may do it.

  The arm main body can also be configured by folding one sheet metal member having the left and right side surfaces provided with the bulging portions side by side. One sheet metal member is folded in half with respect to either the front surface or the rear surface so that the side surfaces are parallel. In this case, the cross section of the front surface (or rear surface) to be folded may be a square cross section in which the front surface (or rear surface) is a plane and the folding edge with the side surface is a corner, but the front surface (or rear surface) is a curved surface and the side surface is A semicircular cross section that is smoothly connected to each other is preferable. Since one sheet metal member has a cross-sectional structure in which a front surface (or rear surface) to be folded and a side surface are connected, there is an advantage that it is easy to increase the structural strength of an arm main body that is a sheet metal hollow member.

  When one sheet metal member is folded in two with the front surface (or rear surface) as an axis, the rear edge (or front edge) that appears on the rear surface (or front surface) that is not folded is abutted or overlapped, and the rear edge (or front edge) Are joined by any one or combination of clinching, caulking, and welding. The rear surface (or front surface) that abuts or overlaps the rear edge (or front edge) may be assigned with the same width or unequal width on each side surface, or the rear surface (or front surface) is provided only on one side surface. The other side may have a rear edge (or front edge) joined to an edge of the rear face (or front face).

  Further, the arm body can be configured by combining other sheet metal members having left and right side surfaces provided with bulging portions in the middle. Different sheet metal members can be given different roles by changing the respective materials, for example, one is a strength member and the other is a lightweight member. Another sheet metal member joins the leading edge and the trailing edge to be abutted or overlapped by any one or combination of clinching, caulking, and welding. The front surface and the rear surface of the arm body sandwiched between the side surfaces may be assigned to each of a pair of separate members with the same width or unequal width, or the front surface and the rear surface are provided only on one of the separate members, and the other of the separate members is the front surface. The front edge and the rear edge may be joined to the edge of the rear surface.

  In the pedal arm of the present invention, the bulged portion having a semicircular cross section is easier to plastically process than the bulged portion having a square cross section. From this, it is preferable that the arm main body has a bulged portion having a square cross section relatively shallower than a bulged portion having a semicircular cross section. As a result, even if the bulging portion having a square cross section that is difficult to be plastically deformed is shallowed, the bulging portion having a semicircular arc shape that is likely to be plastically deformed is deepened, thereby forming a semicircular cross section on the plane of the bulging portion having the square cross section. The ridgeline of the arc-shaped bulge can be reliably brought into contact. In addition, when the arm body is made of a hard sheet metal member, a bulging portion having a semi-circular cross section is formed deeply, so that even if the bulging portion having a square cross section can only be made shallow, a bulging portion having a square cross section is formed. The ridge line of the bulging part having a semicircular cross section can be reliably brought into contact with the plane of the part.

  Further, in the pedal arm of the present invention, the bulged portion having a semicircular cross section is easier to be plastically processed than the bulged portion having a square cross section. In addition, it is preferable that the bulging portion having a semicircular cross section is assigned to the inside in the radial direction, and the side surface provided with the bulging portion is bent in the left-right direction. When the arm body is bent in the normal direction of the side surface (the left-right direction of the vehicle), the radially inner side is compressed and the radially outer side is expanded. The bulging portion having a square cross section assigned to the outer side in the radial direction increases the section modulus of the side surface on the outer side in the radial direction, and suppresses or prevents a reduction in rigidity of the side surface in which the plate thickness decreases due to elongation. Thereby, the deformation | transformation of the arm main body by a bending process can be suppressed or prevented.

  The pedal arm according to the present invention has a necessary and sufficient strength or rigidity so that a pair of bulged portions bulged in a facing relationship from the left and right side surfaces of the arm main body are brought into contact with each other and not deformed during a stepping operation or bending. An arm body is provided. This is an effect of a combination of bulging portions that are symmetrical in the left-right ratio, one having a square cross section and the other having a semicircular cross section. The bulging portion can be simultaneously formed as in the prior art when another or one sheet metal member is formed from a metal plate as a material, for example, by pressing. This is an advantage that the processing procedure and the manufacturing cost are not increased in using the present invention.

  Since the bulging part can be easily formed as in the prior art, the arm main body of the present invention can be configured by combining other sheet metal members in the middle or by folding one sheet metal member in half. The degree is secured. Specifically, the arm body is composed of different sheet metal members, and the materials of the different sheet metal members are made different (for example, a combination of iron and aluminum) to further reduce the weight of the arm body or to make the arm body a single sheet metal. It is composed of members, and can obtain advantages such as improved structural strength by folding in half. In recent years, there is a tendency to reduce the weight of automobile members by combining different materials, but the present invention can be used in accordance with the above tendency.

  The present invention combining a bulged portion with a square cross section and a bulged portion with a semicircular cross section has the effect of reliably bringing a pair of left and right bulged portions into contact regardless of the structure or configuration of the arm body. is there. This is an effect brought about by the fact that the bulged portion having a semicircular cross section is more easily plastically deformed than the bulged portion having a square cross section. This effect is useful when the pedal arm is wide between the side surfaces of the arm body, or when the sheet metal member that constitutes the arm body is made of a hard material. The following effects are brought about.

  Further, the present invention combining the bulging portion having a square cross section and the bulging portion having a semicircular cross section has an effect of suppressing or preventing the deformation of the arm body during bending. This effect is obtained by making the bulged portion having a square cross section relatively shallower than the bulged portion having a semicircular cross section, thickening the bulged portion having the square cross section, and forming the bulged portion having a semicircular cross section. When it is made thin, it appears more prominently. And, because of the effect, the ridge line of the bulging portion of the semicircular cross section is not detached from the plane of the bulging portion of the square cross section, it is possible to maintain the contact state, the pedal arm of the present invention, A secondary effect is obtained in which bending can be performed with a smaller curvature than in the past.

It is a perspective view showing an example of a pedal arm to which the present invention is applied. It is a front view of the pedal arm of this example. It is a right view of the pedal arm of this example. It is an AA end elevation in FIG. FIG. 5 is an end view corresponding to FIG. 4 in another example of a pedal arm. It is a front view showing the step which shape | molds an original plate in the manufacture procedure of the pedal arm of this example. It is a front view showing the step which press-processes a shaping | molding board in the manufacture procedure in the pedal arm of this example. It is a front view showing the step which folds the press-processed intermediate processed product in two in the manufacturing procedure of the pedal arm of this example. It is a front view showing the step which bends the half-finished intermediate product in the manufacture procedure of the pedal arm of this example. It is a perspective view showing the step which bends the half-finished intermediate product in the manufacture procedure of the pedal arm of this example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The pedal arm 1 to which the present invention is applied is folded in two in the front-rear direction (the direction connecting the upper left and lower right in FIG. 1, the direction perpendicular to the paper in FIG. 2), as shown in FIGS. (A vertical direction in FIGS. 1 and 2) A hollow sheet metal that is bent near the middle (backward and lower right in FIG. 1, frontward in FIG. 2) and rightward (upper right in FIG. 1, rightward in FIG. 2). A metal foot pad 12 is welded to the lower end of the arm body 11 as a member. The foot pad may be made of resin, and the coupling means is not limited to welding.

  The arm body 11 includes a left side surface 111 sandwiching a front plate (a surface on the rear side of the vehicle as viewed from the driver) 113 on a press-worked plate 3 (see FIG. 7 described later) formed in advance into a predetermined shape by press work. The right side surface 112 is folded forward, the left end edge 115 and the right end edge 116 of the left side surface 111 and the right side surface 112 are brought into contact with each other, folded in half, and further bent back and right by bending. As shown in FIG. 4, the front surface 113 has a semicircular cross section, and connects the left side surface 111 and the right side surface 112 with a smoothly continuous curved surface. Thereby, the strength of the structure as the arm body 1 is enhanced so that stress is not unevenly distributed on the front surface 113. Moreover, the aesthetics as a motor vehicle member which touches a driver | operator's eyes are also improved.

  The rear side (the rear side as viewed from the driver, the front side of the vehicle) 114 bends the front edge of each of the left side surface 111 and the right side surface 112 in the opposing direction (right side from the left side surface 111 and left side from the right side surface 112). The left end edge 115 and the right end edge 116 are abutted to form a square cross section. The front edge portion bent from each of the left side surface 111 and the right side surface 112 has a width that halves the rear surface 114. The width of the front edge may be asymmetrical. The butted left edge 115 and right edge 116 are joined by welding and covered with a weld bead 117. As the joining means of the left end edge 115 and the right end edge 116, clinch processing and caulking processing can be used (see FIG. 5 described later).

  The arm body 11 of this example has a swing shaft hole 118 through which a swing shaft (not shown) serving as a swing fulcrum as the pedal arm 1 is inserted at the upper end, and the swing motion as the pedal arm 1 is a linear momentum. Rod connecting portions 119 for connecting rods (not shown) that are converted and transmitted to a master cylinder (not shown) are provided slightly above the middle stage in the vertical direction (the part before starting to bend), respectively. A pair of swing shaft holes 118 is provided at left and right symmetrical positions of the left side surface 111 and the right side surface 112, and the swing shaft is inserted therethrough. Further, the rod connecting portion 119 is formed by opening a shaft attachment hole of the rod in the bottom portion of the concave portion formed in the left-right symmetric position of the left side surface 111 and the right side surface 112, and the rod connection shaft is attached to the axis. To do.

  The arm main body 11 is formed with the above-described swing shaft hole 118 and rod connecting portion 119 by press working at a time to form a straight intermediate processed product 4 (see FIG. 8 described later) without bending, and then the right and left as appropriate. Bending in one or both of the direction and the front-rear direction. In the present invention, in order to prevent the left side surface 111 and the right side surface 112 from being deformed during the bending process, a pair of bulging portions 13 and 14 formed in a range sandwiching the middle part in the vertical direction, which is an object to be bent, are shown in FIG. As seen, the ridge line 141 of the bulging portion 14 having a semicircular cross section is brought into contact with the flat surface 131 of the bulging portion 13 having a right-left ratio and having a square cross section.

  In this example, the bulging portion 13 has a square cross section in which a plane 131 parallel to the left side surface 111 is sandwiched between a pair of front and rear vertical surfaces 132 (the vertical surface 132 is slightly inclined because it is necessary to remove the press mold, ). On the other hand, the bulging portion 14 has a semicircular arc section (including a half-circled ellipse and a parabola-like shape in addition to a half circle) continuously curved from the right side surface 112. The bulging portion 14 in this example has the ridgeline 141 that is the deepest position in contact with the front-rear intermediate position of the flat surface 131 of the bulging portion 13, but if the ridgeline 141 is in contact with the flat surface 131, It does not matter if it is displaced in the direction. The ridge line 141 is a continuous line that connects the apexes on the inner side of the bottom of the bulging portion 14, but for convenience of illustration, for example, in FIG.

  The bulging portions 13 and 14 are determined so that the sum of the depths ds and dc is a separation distance obtained by subtracting twice the plate thickness from the orthogonal distance between the right side surface 112 and the left side surface 111. The ridge line 141 of the bulging portion 14 is brought into contact with the 13 flat surfaces 131. In this example, the depth ds of the bulging portion 13 is shallower than half of the separation distance, the depth dc of the bulging portion 14 is deeper than half of the separation distance, and the depth ds of the bulging portion 13 is expanded. It is relatively shallower than the depth dc of the protruding portion 14 (see FIG. 4). As a result, the plate thickness of the bulging portion 13 is relatively thicker than the plate thickness of the bulging portion 14 (in FIG. 4, the thickness is the same for convenience of illustration), and bending in the left-right direction described later is performed. At this time, the bulging portion 13 is secured for expansion, and the bulging portion 14 is secured for compression.

  Further, the arm body 11 of this example assigns the bulging portion 13 having a square cross section to the radially outer surface = left side surface 111 in the lateral bending, and the bulging portion 14 having a semicircular cross section has the radial direction. The inner side is assigned to the right side 112. As a result, a decrease in the rigidity of the left side surface 111 on the radially outer side where the plate thickness is reduced is suppressed or prevented by the bulged portion 13 having a square cross section that increases the section modulus. Further, as described above, since the expansion allowances 13 and 14 are secured for their respective expansion allowances or compression allowances, the generation of cracks and distortions due to bending is suppressed or prevented.

  The arm main body 11 of this example is configured by bending a left-right direction and a front-rear direction after making a straight intermediate processed product 4 (FIG. 8) from the original plate 2 (see FIG. 6 below). For this reason, emphasis is placed on the suppression or prevention of the deformation caused by the bending, particularly the deformation of the left side surface 111 and the right side surface 112. The arm main body 11 of the present invention suppresses or prevents deformation of the left side surface 111 and the right side surface 112 by the action of the above-described bulging portions 13 and 14 during bending in the left-right direction. Further, the arm body 11 of the present invention, when bending in the front-rear direction, deforms the left side surface 111 and the right side surface 112 by the front surface 113 having a semicircular cross section in addition to the function of the bulging portions 13 and 14 described above. Suppress or prevent.

  In the present invention, as described above, the present embodiment is configured by folding one press-worked plate 3 (sheet metal member, see FIG. 7 described later) having the left side surface 111 and the right side surface 112 provided with the bulging portions 13 and 14 side by side. In addition to the arm main body 11, as shown in FIG. 5, another sheet metal member having a left side surface 151 and a right side surface 152 provided with the bulging portions 13 and 14 is arranged in the middle to form another arm main body. 15 can be used. The arm body 15 of another example has the same depth ds and dc of the bulging portions 13 and 14, but the bulging portion 13 having a square cross section on the radially outer side and a cross section on the radially inner side with respect to the left and right bending processes. The semicircular arc-shaped bulging portion 14 is assigned, and the deformation of the left side surface 151 and the right side surface 152 during bending can be suppressed or prevented, like the arm body 11 of this example.

  In another example, the arm body 15 includes another sheet metal member having a left side surface 151 and a right side surface 152, a right front edge portion 156 (or right rear edge portion 158) of the sheet metal member constituting the right side surface 152, and a left side surface 155. The sheet metal member to be formed is wound around the left front edge portion 155 (or the left rear edge portion 158) to form a clinch coupling portion 159, which are integrated. Therefore, both the front surface 153 and the rear surface 154 have an appearance in which the clinch joint portion 159 protrudes. Although illustration is omitted, in order to prevent the left front edge 155 (or the left rear edge 158) from being unwound in the clinch joint 159, the clinch joint 159 is subjected to caulking, or welding is performed. To do.

  A manufacturing procedure of the pedal arm 1 of this example will be described. As shown in FIG. 6, the pedal arm 1 of the present example first cuts off the end material around the long rectangular original plate 2 in plan view to form a molded plate 21. The arm body 11 includes bulging portions 13 and 14 and a rod connecting portion 119 formed by three-dimensional plastic deformation with respect to the flat left side surface 111 and the right side surface 112. The molding plate 21 is slightly curved at the periphery after press working in consideration of plastic deformation due to the formation of the bulging portions 13 and 14 and the rod connection portion 119 so that the left end edge 115 and the right end edge 116 are straight. It has a peripheral shape.

  The molded plate 21 inevitably generates a small amount of edge material. However, as shown in this example, the press-processed product 3 is formed from the molded plate 21, and the press-processed product 3 is bent to follow the manufacturing procedure for producing the arm body 11. Compared with the conventional manufacturing procedure in which the sheet metal member is die-cut from the original plate 2, the generated end material can be significantly reduced. This is an effect that the bulging portions 13 and 14 that always come into contact with each other can be bent after the linear intermediate workpiece 4 is formed. And the fact that there are few offcuts means that the original plate 2 can be made small, which brings about the effect of reducing the material cost.

  The forming plate 21 is pressed by a predetermined die, and is formed into the pressing plate 3 having the bulging portions 13 and 14 and the rod connecting portion 119 as seen in FIG. The press-worked plate 3 of this example has not only the formation of the bulging portions 13 and 14 and the rod connecting portion 119, but also the left edge 115 in a direction perpendicular to the left side surface 111 and the right side surface 112 (the direction toward the back of the paper surface in FIG. 7). And the processing until the right edge 116 is folded back is finished. Then, the press-worked plate 3 is formed by folding the left side surface 111 and the right side surface 112 at the other end while keeping the front surface 113 in a semicircular cross section, and the left end edge 115 and the right end edge as shown in FIG. The intermediate processed product 4 in which 116 is abutted is formed. The bulging portions 13 and 14 are already in contact with each other in the intermediate processed product 4.

Finally, as shown in FIGS. 9 and 10, the intermediate processed product 4 is bent leftward and forwardly at the middle in the vertical direction, that is, at the vicinity where the bulging portions 13 and 14 abut. Thus, the intermediate processed product 5 is the same in appearance as the arm body 11. The deformation of the intermediate processed product 5 (particularly the left side surface 111 and the right side surface 112) due to bending is suppressed or prevented by the contact of the bulging portions 13 and 14. In the intermediate processed product 5, the left end edge 115 and the right end edge 116 which are abutted are integrated by welding to form an arm body 11, and the foot pad 12 is fixed to the lower end by welding to complete the pedal arm 1 (see FIG. 1). ).

1 Pedal arm
11 Arm body
12 Foot pads
13 Square bulge
14 Cross section semicircular arc
141 ridgeline
15 Another arm body 2 Original plate
21 Formed plate 3 Pressed plate 4 Intermediate processed product before bending 5 Intermediate processed product after bending
ds Depth of bulging section with square cross section (distance from side to inside of plane)
dc Depth of bulging part of semicircular arc section (distance from side to inside of ridge)

Claims (5)

In the pedal arm that attaches the foot pad to the lower end of the arm body that is a hollow member made of sheet metal,
The arm main body is provided with a pair of bulging portions that protrude in a facing relationship from the left and right side surfaces,
One of the bulges has a square cross section having a plane parallel to the side surface, and the other of the bulges has a semicircular cross section projecting along the normal direction of the plane. A pedal arm characterized in that a bulging portion having a semicircular arc cross section is brought into line contact with the pedal arm. The pedal arm according to claim 1, wherein the arm body is configured by folding one sheet metal member having the left and right side surfaces provided with the bulging portions side by side. The pedal arm according to claim 1, wherein the arm body is formed by combining other sheet metal members having left and right side surfaces provided with bulging portions. The pedal arm according to any one of claims 1 to 3, wherein the arm main body has a relatively shallow bulged portion having a square cross section than a bulged portion having a semicircular cross section. The arm body has a bulged portion having a square cross section assigned to the radially outer side and a bulged portion having a semicircular cross section shaped to the radially inner side, and the side surface provided with the bulged portion is bent in the left-right direction. The pedal arm according to any one of 1 to 4.

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