JPH0630541U - Shim plate mounting structure for friction pad - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the yield by effectively removing the shim plate from the plate material without waste. [Structure] A rectangular locking protrusion 11c is provided at the center of the back surface of the back plate 11.
To provide. At the center of the shim plate 12, notches are made at four corners of a rectangular opening, and a locking hole 12a is formed by sloping a claw piece 12b on the four sides of the opening to one side. The locking hole 12a is press-fitted into the locking protrusion 11c, and the shim plate 12 is attached to the back surface of the back plate 11.
Install.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for attaching a shim plate to a friction pad used for a disc brake of various traveling vehicles.

[0002]

[Prior art]

 Friction pads used in disc brakes for vehicles such as automobiles are composed of a lining that slides on the disc rotor and a metal back plate that is held by the caliper body and caliper bracket. A shim plate for the purpose of preventing squeaking during braking, uneven wear of the lining, or heat insulation is attached to the back surface of the sheet (for example, see Japanese Utility Model Laid-Open No. 64-55331). The shim plate is attached so as to wrap the back plate by bending a plurality of projecting pieces protruding from the side surface into an L shape and engaging these projecting pieces with the side edges of the back plate.

[0003]

[Problems to be solved by the device]

 However, when removing the shim plate from the plate material, a lot of useless cut-off portions are formed between the protruding pieces on the outer side of the shim plate, resulting in a bad yield.

Therefore, an object of the present invention is to provide a shim plate mounting structure of a friction pad that can effectively remove the shim plate from the plate material without waste and can increase the yield.

[0005]

[Means for Solving the Problems]

 According to the above-mentioned object, the present invention has a structure in which a shim plate is attached to the back surface of a back plate having a lining bonded to the front surface thereof. It is characterized in that it is opened, and the shim plate is attached by fitting the engaging hole into the engaging protrusion.

[0006]

[Action]

 According to this structure, no protruding piece is required on the outer portion of the shim plate, and the shim plate can have a shape that matches the shape of the back surface of the back plate.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

The disc brake 1 has a caliper bracket 3 fixed to the vehicle body at one side of the disc rotor 2 and a caliper body 4 movable in the disc axial direction via a sliding pin (not shown). A pair of friction pads 5 are arranged between the action portion 4a and the reaction portion 4b of the caliper body 4 to support each other, with the disc rotor 2 interposed therebetween.

A cup-shaped piston 7 is housed in a cylinder hole 6 that is open to the disk rotor 2 side in the action portion 4a, and a pair of reaction force claws 4c, (4c) are provided in the reaction portion 4b. The holes 6 are provided so as to face each other so as to sandwich the hole 6. A hydraulic chamber 8 is defined between the piston 7 and the bottom of the cylinder hole 6, and when hydraulic liquid from a separately provided hydraulic master cylinder is introduced into the hydraulic chamber 8 through the inlet port 9, The piston 7 advances through the cylinder hole 6 and presses one of the friction pads 5 against one side surface of the disc rotor 2, and the reaction force causes the caliper body 4 to move in the direction of the action portion, and the reaction force claw 4c. , (4c) presses the other friction pad 5 against the other side surface of the disc rotor 2.

Each friction pad 5 includes a lining 10 that is in sliding contact with the side surface of the disk rotor 2, and a back plate 11 that holds the ear pieces 11 a, 11 a protruding on both sides thereof on the caliper bracket 3. Further, a shim plate 12 is attached to the back surface of the back plate 11, so that the squeal of the brake and uneven wear of the lining 10 during braking are prevented by the shim plate 12 as much as possible.

In addition to the above-mentioned ear pieces 11a and 11a, the back plate 11 is provided with a rectangular binding hole 11b and a locking projection 11c at the same position on the front and back sides at the center. The binding holes 11b and the locking projections 11c are integrally formed by half-peer processing from the surface side of the back plate 11 which is a lining joint surface, and an adhesive is used to bond the lining 10 and the back plate 11 together. Besides, by fitting the binding protrusions 10a of the lining 10 into the binding holes 11b of the back plate 11, the both can be accurately and easily aligned and the binding strength is further enhanced.

The shim plate 12 is formed in a similar shape that is one size smaller than the back surface of the back plate 11 excluding the ear pieces 11a and 11a, and is fitted in the locking protrusion 11c of the back plate 11 at the center thereof. A locking hole 12a to be fitted is provided. The locking hole 12a is formed by making notches at the four corners of the rectangular opening and inclining the claw pieces 12b on the four sides of the opening toward one side of the shim plate 12.

The shape of the space surrounded by the inner edge of the tip of each of the four claw pieces 12b is a rectangle that is slightly smaller than the locking projection 11c of the back plate 11, and the shim plate 12 has a shape similar to that of the projections of these claw pieces 12b. The opposite surface is directed to the back surface of the back plate 11, and the locking holes 12a are press-fitted into the locking projections 11c to be attached in close contact with the back surface of the back plate 11. The locking hole 12a and the locking projection 11c, which are press-fitted, are housed in the opening of the piston 7 on the side of the action portion 4a, and between the reaction force claws 4c, 4c on the side of the reaction portion 4b. Since the pistons 7 and the reaction force claws 4c come into contact with the respective shim plates 12 and push the friction pad 5 because they are provided, they do not hinder the friction pads 5.

In this way, according to this embodiment, the locking projections 11c of the back plate 11 and the locking holes 12a of the shim plate 12 are press-fitted into each other so that the shim plate 12 is loosened to the back plate 11. Securely installed without attachment. In particular, since the tapered claw piece 12b is designed to bite the peripheral surface of the locking projection 11c in the press-fitting direction, the shim plate 12 is attached more firmly.

Furthermore, since a plurality of protrusions, unlike the conventional case, do not protrude from the outer periphery of the shim plate 12, it is excellent in material removal from the plate material and the yield can be improved. Further, since the locking projections 11c and the locking holes 12a are formed in a rectangular shape, there is no possibility that the shim plate 12 is displaced from the back plate 11 or rotated. Further, in this embodiment, the binding hole 11b and the locking protrusion 11c are simultaneously formed by the half piercing, so that the workability is excellent.

4 to 6 show another embodiment of the present invention. Ring-shaped locking projections 11d and 11d are formed on the upper and lower central portions of the back plate 11 so as to project through the inside. Like the left and right binding holes 11f and 11f, the binding protrusions 10a of the lining 10 are fitted in the holes 11e in a concavo-convex manner.

On the other hand, locking holes 12c, 12c to be fitted into the locking projections 11d, 11d are formed above and below the central portion of the shim plate 12. Each locking hole 12c is a circular hole having a diameter larger than that of the locking projection 11d, and two upper and lower claw pieces 12d, 12d are provided so as to taper to one side. At the time of press-fitting, the claw pieces 12d and 12d bite on the outer peripheral surface of the locking protrusion 11d to securely attach the shim plate 12 to the back plate 11 without rattling or dropping, as in the above-described embodiment. .

Further, since the circular hole of the locking hole 12c has a larger diameter than the locking projection 11d, the friction pad 5 and the shim plate 12 are relatively moved in the disc circumferential direction during braking, and the shim The durability of the shim plate 12 is improved by preventing the plate 12 from being scratched by a piston or a reaction claw. Further, in this embodiment, since the locking projection 11d and the locking hole 12c are circular, the shim plate 12 is prevented from rotating by forming two sets of them.

The shape and the number of combinations of the locking projection and the locking hole of the present invention are not limited to those in the above-described embodiment, but can be changed as appropriate according to the setting conditions of the friction pad and the shim plate. is there. For example, the locking hole of the shim plate may have a shape like a so-called chrysanthemum washer with an internal tooth having a plurality of claw pieces protruding from the inner circumference of the circular hole.

[0020]

[Effect of device]

 As described above, according to the present invention, the locking projection is provided on the back surface of the back plate of the friction pad, the locking plate is provided with the locking hole, and the locking hole is provided with the locking projection. Since the shim plate is attached by fitting to, the plurality of projecting pieces unlike the prior art do not project to the outer periphery of the shim plate, so that it is excellent in material removal from the plate material and the yield can be improved.

Further, by forming the locking projections and the locking holes in a rectangular shape or an elliptical shape, or by forming a plurality of combinations of the circular locking projections and the locking holes, the load from the piston or the reaction force claw is increased. However, the shim plate does not rotate. In addition, the locking hole is made larger than the locking projection in the disk circumferential direction so that the friction pad and the shim plate during braking can be moved relative to each other in the disk circumferential direction. Since it is not scratched by the reaction force nail, the durability of the shim plate can be improved, which is preferable.

[Brief description of drawings]

FIG. 1 is a perspective view of a combination of a friction pad and a shim plate showing an embodiment of the present invention.

2 is a sectional front view of a disc brake to which the combination of the friction pad and the shim plate of FIG. 1 is applied.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a perspective view showing a combination of a friction pad and a shim plate according to another embodiment of the present invention.

5 is a sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI of FIG.

[Explanation of Codes] 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper bracket 4 ... Caliper body 4c ... Reaction force claw 5 ... Friction pad 7 ... Piston 10 ... Lining 10a ... Binding protrusion 11 ... Back plate 11a ... Ear piece 11b ... binding hole 11c ... locking projection 12 ... shim plate 12a ... locking hole 12b ... claw piece of locking hole 12a

Claims (1)

[Scope of utility model registration request] 1. A structure in which a shim plate is attached to a back surface of a back plate having a lining bonded to the front surface thereof, a locking projection is provided on the back surface of the back plate, and a locking hole is formed in the shim plate. A shim plate mounting structure for a friction pad, characterized in that a stop hole is fitted to the locking projection to mount a shim plate.