Bedplate for making wheels

Abstract

To provide a base plate for brake shoes in which the connection portion between the cotter mounting portion and the base plate body and the protrusion supporting the cotter have sufficient strength and which is easy to manufacture. [Solution] The brake shoe base plate 1 of the present invention has an arc-shaped base plate body 2, a cotter mounting portion 3 formed integrally with the base plate body 2 and protruding toward the outside of the arc, two cotter mounting holes 4 provided on the sides of the cotter mounting portion 3, a hole portion 5 having an elliptical shape in a planar view and provided integrally with the cotter mounting portion 3 on the outside of the top of the cotter mounting portion 3, and a protrusion 6 having an elliptical shape in a planar view and provided integrally with the cotter mounting portion 3 on the inside of the top of the cotter mounting portion 3 and facing the hole portion 5.

Description

[Technical field]

[0001] The present invention relates to a base plate for a brake shoe. [Background technology]

[0002] A brake shoe device for a railway vehicle is mainly composed of a brake shoe head attached to the vehicle side and a brake shoe assembled to the brake shoe head. The brake shoe is generally composed of a base plate formed in an arc shape, a friction material (lightning) attached to the base plate, and an attachment part (cotter attachment part) welded to the base plate (for example, Patent Document 1). Brake shoes in which the base plate and the attachment part are integrally formed are also known (for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-41617 A [Patent Document 2] JP 2024-90810 A Summary of the Invention [Problem to be solved by the invention]

[0004] As shown in Patent Document 1, the mounting part is provided with a mounting hole for passing the cotter, and is configured to have a curved surface curved in an M shape so that the top of the mounting hole and the upper surface inside the mounting hole are at the same height. Also, when the mounting part is formed integrally with the base plate, that is, seamlessly and integrally with the base plate, as in Patent Document 2, it is difficult to curve it, so a method such as welding a protrusion is used. These curved surfaces and protrusions function as one of the fulcrums that support the cotter to be inserted.

[0005] However, when the mounting part is attached to the base plate by welding as in the brake shoe of Patent Document 1, the strength of the mounting part may not be sufficient.Also, when the protrusion part serving as the fulcrum is welded separately as in the brake shoe of Patent Document 2, the strength is not sufficient and the manufacturing method is complicated.

[0006] Therefore, an object of the present invention is to provide a base plate for brake shoes that has sufficient strength in the connection portion between the cotter mounting portion and the base plate body and in the protrusion that supports the cotter, and that is easy to manufacture. [Means for solving the problem]

[0007] The present invention relates to a circular arc-shaped base plate body, A cotter attachment portion formed integrally with the base plate body and protruding toward the outside of the arc; Two cotter mounting holes provided on the sides of the cotter mounting portion; a hole portion having an elliptical shape in a plan view, the hole portion being integrally provided with the cotter mounting portion on the outer side of a top portion of the cotter mounting portion; a protrusion having an elliptical shape in a plan view, the protrusion being integral with the cotter mounting portion and facing the hole portion on the inside of the top of the cotter mounting portion; have This is a brake shoe base plate.

[0008] The present specification also provides a method for manufacturing the brake block base plate of the present invention, forming the base plate body and the cotter attachment portion by pressing; forming the hole and the protrusion in the cotter attachment portion simultaneously by pressing; have A method for manufacturing a brake shoe base plate is also disclosed. Effect of the Invention

[0009] According to the present invention, it is possible to provide a brake shoe base plate in which the connection portion between the cotter mounting portion and the base plate body and the protrusion supporting the cotter have sufficient strength and are easy to manufacture. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a cross-sectional view showing an example of an embodiment of a brake shoe base plate of the present invention. [Diagram 2] FIG. 2 is a top view of the brake shoe base plate shown in FIG. [Diagram 3] FIG. 2 is a perspective view of the brake shoe base plate shown in FIG. 1 from below. [Figure 4] FIG. 2 is an enlarged cross-sectional view of a mounting portion of the brake shoe base plate shown in FIG. [Diagram 5] 2 is a process diagram showing an example of a manufacturing method of a brake shoe base plate of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, preferred embodiments of the brake shoe base plate and the manufacturing method thereof according to the present invention will be described in detail. Fig. 1 is a cross-sectional view showing one embodiment of the brake shoe base plate according to the present invention. Fig. 2 is a top view of the brake shoe base plate shown in Fig. 1. Fig. 3 is a perspective view from below of the brake shoe base plate shown in Fig. 1. Fig. 4 is an enlarged cross-sectional view of the mounting portion of the brake shoe base plate shown in Fig. 1.

[0012] <Base plate for brake shoes> The brake shoe base plate 1 according to the present invention functions as a brake shoe by attaching a friction material (lightning) via a reinforcing plate, and is particularly suitable for use as a brake shoe base plate for railways. As shown in Figures 1 to 4, the brake shoe base plate 1 in this embodiment has an arc-shaped base plate body 2, a cotter mounting portion 3 formed integrally with the base plate body 2 and protruding toward the outside of the arc, two cotter mounting holes 4 provided on the sides of the cotter mounting portion 3, a hole portion 5 having an elliptical shape in a planar view and provided integrally with the cotter mounting portion 3 on the outside of the top of the cotter mounting portion 3, and a convex portion 6 having an elliptical shape in a planar view and provided integrally with the cotter mounting portion 3 on the inside of the top of the cotter mounting portion 3 and opposite the hole portion 5.

[0013] 1 and 3, the base plate body 2 is in an arc shape, and a friction material can be attached to the inside of the arc via a reinforcing plate (not shown). The base plate body 2 is made of a plate material made of metal such as iron. The thickness of the base plate body 2 is preferably 4 to 10 mm, and more preferably 5 to 8 mm.

[0014] As shown in Figures 1 and 3, the cotter mounting part 3 is formed integrally with the base plate body 2 and is provided so as to protrude towards the outside of the arc of the base plate body 2. Because the cotter mounting part 3 is formed integrally with the base plate body 2, the strength of the connection part between the cotter mounting part 3 and the base plate body 2 can be made high. As shown in Figure 1, the cotter mounting part 3 has a U-shaped cross section. The thickness of the cotter mounting part 3 (thickness indicated by A in Figure 4) is preferably 4 to 10 mm, and more preferably 5 to 8 mm.

[0015] As shown in Figures 1 to 3, the two cotter mounting holes 4 are formed as through holes in the side portions of the cotter mounting portion 3. A brake shoe head (not shown) for supporting the brake shoe is attached to the brake shoe base plate 1 by inserting a cotter into the cotter mounting hole 4. The end of the cotter mounting hole 4 on the top side of the cotter mounting portion 3 functions as a fulcrum for restricting the movement of the cotter and the brake shoe head and brake shoe connected thereto.

[0016] As shown in Figs. 1 to 4, a hole 5 formed integrally with the cotter attachment part 3 is provided on the outer side of the top of the cotter attachment part 3. The hole 5 has a bottom surface and is elliptical in plan view. The depth of the hole 5 (depth indicated by B in Fig. 4) is preferably 3 to 8 mm, and more preferably 3.5 to 6 mm. In addition, when the thickness of the base plate main body 2 is A [mm] and the depth of the hole 5 is B [mm], it is preferable that the relationship 0.6A ≦ B ≦ 0.84A is satisfied, and it is more preferable that the relationship 0.7A ≦ B ≦ 0.8A is satisfied.

[0017] As shown in Figs. 1 to 4, a convex portion 6 formed integrally with the cotter mounting portion 3 is provided on the inside of the top of the cotter mounting portion. The convex portion 6 is provided facing the hole portion 5, and has an elliptical shape in a plan view. Since the convex portion 6 is formed integrally with the cotter mounting portion 3 in this manner, the convex portion 6 has sufficient strength as a fulcrum for supporting the cotter. The height of the convex portion 6 is the same as the edge of the top side of the cotter mounting hole 4. Specifically, the height of the convex portion 6 (height indicated by C in Fig. 4) is preferably 3 to 8 mm, and more preferably 3.5 to 6 mm. In addition, when the thickness of the base plate main body 2 is A [mm] and the height of the convex portion 6 is C [mm], it is preferable that the relationship of 0.6A ≦ C ≦ 0.84A is satisfied, and it is more preferable that the relationship of 0.7A ≦ C ≦ 0.8A is satisfied.

[0018] In particular, when the thickness of the base plate body 2 is A [mm], the depth of the hole 5 is B [mm], and the height of the protrusion 6 is C [mm], it is preferable that A=4 to 10 mm, the relationship of 0.6A≦B≦0.84A, and the relationship of 0.6A≦C≦0.84A are satisfied simultaneously, and it is more preferable that A=5 to 8 mm, the relationship of 0.7A≦B≦0.8A, and the relationship of 0.7A≦C≦0.8A are satisfied simultaneously. This makes it possible to improve the strength of the protrusion 6 as a fulcrum supporting the cotter.

[0019] Moreover, the distance between the hole 5 and the protrusion 6 (the distance indicated by D in FIG. 4) is preferably 1 to 3 mm, and more preferably 1 to 2 mm, which can provide the protrusion 6 with superior strength as a fulcrum for supporting the cotter.

[0020] <Manufacturing method of brake shoe base plate> Next, a method for manufacturing the brake shoe base plate will be described. Fig. 5 is a process diagram showing an example of a method for manufacturing the brake shoe base plate of the present invention. The manufacturing method of the brake shoe base plate of the present invention includes a step of forming the base plate body 2 and the cotter mounting portion 3 by press processing, and a step of simultaneously forming a hole portion 5 and a protrusion portion 6 in the cotter mounting portion 3 by press processing.

[0021] A detailed explanation will be given below with reference to FIG. First, as shown in FIG. 5(a), a plate (for example, an iron plate) that will become the brake shoe base plate is prepared. Next, as shown in FIG. 5(b), a cotter mounting hole 4 is formed in the prepared plate. Next, as shown in FIG. 5(c), the base plate body 2 and the cotter attachment portion 3 are formed by pressing. Next, as shown in FIG. 5(d), a part of the top of the cotter attachment portion 3 is pressed inwardly to form the hole 5 and the protrusion 6 at the same time. According to such a manufacturing method, the brake shoe base plate 1 can be manufactured in a small number of steps without requiring welding.

[0022] Although the preferred embodiment of the brake shoe base plate of the present invention has been described above, the present invention is not limited thereto. [Explanation of symbols]

[0023] 1 Base plate for brake shoes 2 Base plate body 3 Cotter mounting part 4 Cotter mounting holes 5 Hole 6 Convex

Claims

1. An arc-shaped base plate body; A cotter attachment portion formed integrally with the base plate body and protruding toward the outside of the arc; Two cotter mounting holes provided on the sides of the cotter mounting portion; a hole portion having an elliptical shape in a plan view, the hole portion being integrally provided with the cotter mounting portion on the outer side of a top portion of the cotter mounting portion; a protrusion having an elliptical shape in a plan view, the protrusion being integral with the cotter mounting portion and facing the hole portion on the inside of the top of the cotter mounting portion; have Brake plate.

2. The thickness of the base plate body is 4 to 10 mm; When the thickness of the base plate body is A [mm], the depth of the hole is B [mm], and the height of the protrusion is C [mm], the relationships 0.6A≦B≦0.84A and 0.6A≦C≦0.84A are satisfied. The brake shoe base plate according to claim 1.

3. The depth of the hole is 3 to 8 mm. The brake shoe base plate according to claim 1.

4. The height of the protrusion is 3 to 8 mm. The brake shoe base plate according to claim 1.

5. The distance D between the hole and the protrusion is 1 to 3 mm. The brake shoe base plate according to claim 1.

6. The base plate body has a reinforcing plate on the inside of the arc for reinforcing the base plate body. The brake shoe base plate according to claim 1.

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