JPH0558978U - Brake shoes for vehicle drum brakes - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent movement of the brake shoe in the axle direction during braking, and reduce noise and uneven wear of the lining. [Structure] The anchor 7 side of the web 3a is expanded into a bifurcated shape to form expanded ends 3e and 3e. Expanded ends 3e, 3
e into the recess 7d of the anchor 7, and the back plate 2
And the anchor plate 7b for positioning in the axle direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brake shoe that is disposed inside a back plate of a drum brake for a vehicle so as to face the brake shoe.

[0002]

[Prior Art]

 As shown in Japanese Utility Model Publication No. 1-7869, for example, the brake shoes of the drum brake are arranged on the back plate so as to be opposed to each other on the left and right sides, and are elastically held by shoehold pins inserted through the web via shoehold springs. One end is in contact with the recess of the actuator arranged on the back plate, and the other end is in contact with the recess of the anchor fixedly mounted on the back plate.

[0003]

[Problems to be solved by the device]

 However, in the structure described above, the width of the actuator and the recess of the anchor with which the end of the brake shoe abuts in the axial direction is wider than the thickness of the web, so that the web moves in the axial direction during braking, which causes abnormal noise and brake shoes. Uneven wear may occur in the lining of the.

Therefore, the present invention provides a brake shoe for a vehicle drum brake, which has a simple structure and can prevent the movement of the web in the axial direction during braking, and can reduce the occurrence of abnormal noise and uneven wear of the lining. The purpose is to

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is directed to a vehicle drum brake in which one end of a web is in contact with a recess of an actuator arranged in a back plate and the other end is in contact with a recess of an anchor fixed to the back plate. In the brake shoe, one or both of the both ends of the web is expanded into a bifurcated shape, and the width of the expanded end is formed to be substantially the same width as the recess.

[0006]

[Action]

 As a result, the expanded end of the web fits within the width of the recess of the actuator or anchor in the axle direction, and the movement of the web in the axle direction during braking is eliminated.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention, in which a drum brake 1 includes a pair of brake shoes 3 and 3 arranged to face a back plate 2, a shoe hold pin 4 and a shoe. It is elastically held by the hold spring 5, a wheel cylinder 6 is fixed between one end of the brake shoes 3, 3, and an anchor 7 is fixed between the other ends.

A return spring 8 is provided between the brake shoes 3 and 3 in the vicinity of the wheel cylinder 6, and a strut 9 having an automatic braking clearance adjusting device is provided in the vicinity of the return spring 8. There is.

The brake shoe 3 is formed by welding a rim 3b to the outer peripheral side of an arcuate web 3a composed of a joined body of two plate materials, and a lining 3c is adhered to the outer peripheral surface of the rim 3b. There is.

As shown in FIG. 4, the end portion 3d of the web 3a on the side of the wheel cylinder 6 remains bonded to the two plate members, and the anchor 7 side includes the two plate members bonded to a predetermined position. Is expanded in a bifurcated shape toward the end side to form expanded end portions 3e, 3e.

The wheel cylinder 6 is capable of moving a pair of pistons 6b 1 and 6b, which move in a direction away from each other by hydraulic pressure to expand the brake shoes 3 and 3 to perform a braking action, in a cylinder body 6a in a liquid-tight manner. The pistons 6b, 6b are formed at their outer ends with recesses 6c, 6c with which the end portion 3d of the web 3a abuts.

The anchor 7 is formed by sandwiching the anchor block 7a on the back plate 2 with the anchor plate 7b and the wire guide plate 7c and fixing them with the rivets 10 and 10. The web 3a is provided between the back plate 2 and the anchor plate 7b. A recessed portion 7d with which the expanded end portions 3e, 3e of the abutting portion abut is formed.

The expanded ends 3e, 3e are formed such that the width thereof is substantially the same as the width of the recess 7d in the axial direction, that is, the distance between the back plate 2 and the anchor plate 7b.

With this configuration, the expanded ends 3e, 3e of each brake shoe 3 are housed in the recess 7d of the anchor block 7a, and are positioned on the back plate 2 and the anchor plate 7b in the axial direction. As a result, the web 3a does not rattle during braking, and it is possible to reduce generation of abnormal noise and uneven wear of the linings 3c, 3c.

FIG. 5 shows a second embodiment of the present invention, in which a brake shoe 20 includes an arcuate web 20a composed of a joined body of two plate materials, and two plates from a central portion to a predetermined position. The plate members are joined to each other, and the two plate members are expanded in a bifurcated manner from the predetermined position toward both ends, so that the piston side expansion end parts 20b and 20b and the anchor side expansion end parts 20c and 20c are formed. And form.

As a result, the brake shoe 20 is arranged by inserting the piston-side expanded ends 20b and 20b into the recess 6c of the piston 6b and the anchor-side expanded ends 20c and 20c into the recess 7d of the anchor 7. It is possible to more effectively reduce rattling of the brake shoes 3, 3, generation of abnormal noise, and uneven wear of the linings 3c, 3c.

It is also possible to use the brake shoe 3 and the brake shoe 20 in combination. For example, in a leading or trailing type drum brake, the anchor 7 side is formed into a bifurcated shape on the leading side. If the brake shoe 3 is used, in which both the wheel cylinder 6 side and the anchor 7 side are bifurcated on the trailing side, it is possible to effectively prevent the brake shoes 3 and 20 from rattling. it can.

6 to 8 show a third embodiment of the present invention, in which a brake shoe 30 is formed by pressing a flat plate into a T-shaped cross section and joining two plate members together. A web 30a formed of a body and a single-plate rim 30b are integrally formed and curved into an arc shape by roll processing, and a lining 30c is bonded to the rim 30b.

On the anchor 7 side of the web 30a, the folded portion of the web 30a and the bent portions of the web 30a and the rim 30b are cut from a predetermined position to the end portion side to expand in a bifurcated shape. Further, the webs 30a, 30a that are expanded in a shape are formed into a Y shape and are joined to the rim 30b by welding to form expanded ends 30d, 30d.

It should be noted that the present invention is not limited to the one in which the web made of two plates is separated from a predetermined position to form a bifurcated shape as in each of the above-described embodiments, and the web made of one plate is It is also possible to form the expanded end portion by separating it from a predetermined position in a Y shape.

[0022]

[Effect of the device]

 As described above, according to the present invention, one or both of the piston-side abutting end and the anchor-side abutting end of the web of the brake shoe is expanded into a bifurcated shape, and the expanded end is expanded into the piston or the anchor. Since it comes into contact with the concave portion of the wheel, it is possible to prevent the movement of the web in the axial direction during braking, and reduce the occurrence of abnormal noise and uneven wear of the lining.

[Brief description of drawings]

1 is a sectional view taken along line I-I of FIG.

FIG. 2 is a front view of a drum brake showing the first embodiment of the present invention.

[FIG. 3] Similarly, a front view of the brake shoe

FIG. 4 is an IV-IV arrow view of FIG.

FIG. 5 is a bottom view of a brake shoe showing a second embodiment of the present invention.

FIG. 6 is a bottom view of a brake shoe showing a third embodiment of the present invention.

7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII in FIG.

[Explanation of symbols]

1 ... Drum brake, 2 ... Back plate, 3, 20,
30 ... Brake shoes, 3a, 20a, 30a ... Web, 3e, 20b, 20c, 30d ... Expanded end part, 6 ... Wheel cylinder, 6b ... Piston, 6c ... Recessed part, 7 ...
Anchor, 7d ... Recess

Claims (1)

[Scope of utility model registration request] 1. A brake shoe of a drum brake for a vehicle, wherein one end of a web abuts a recess of an actuator arranged on a back plate and the other end abuts a recess of an anchor fixed to the back plate. A brake shoe for a vehicle drum brake, characterized in that either one or both of both ends is expanded into a bifurcated shape, and the width of the expanded end is formed to be substantially the same width as the recess.