JPH0522654Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[0001]

[Field of Industrial Application] The present invention relates to a disc brake that is suitably used to apply braking force to vehicles, etc., and in particular, the present invention is designed to prevent damage to the shim plate provided on the back metal of the friction pad. Regarding the disc brake.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show disc brakes according to the prior art.

[0003] In the figure, 1 indicates a disk that rotates together with the wheels, and 2 indicates a mounting bracket that is attached to a non-rotating part of the vehicle on one side of the disk 1. a pair of arms (not shown) are provided;
Each of the arms supports a caliper 3, which will be described later, in a slidable manner in the axial direction of the disk 1.

[0004] Reference numeral 3 indicates a caliper that is slidably supported on each arm of the mounting bracket 2, and the caliper 3
is formed so as to straddle the disk 1, and the caliper 3 is provided with an inner leg portion 4 and an outer leg portion 5 located on one side and the other side of the disk 1. Here, a cylinder 4A consisting of a circular bottomed hole is formed on the inner peripheral side of the inner leg portion 4, and the cylinder 4A
A piston 6 is slidably fitted inside.
A hydraulic chamber 7 is formed between the piston 6 and the bottom of the cylinder 4A, and brake fluid is supplied and discharged from a master cylinder (not shown) into the hydraulic chamber 7 through a fluid hole 4B. It is becoming more and more common.

[0005] On the other hand, the outer leg portion 5 is provided with an inverted U-shaped notch 5A (notch 13 in FIG. 2).
A), the outer leg portion 5 has forked claw portions 5B, 5B (however, only one is shown) due to the notch 5A.
is formed. In addition, as shown in FIG. 6, a notch 5A is provided at the inner peripheral edge of the deep part between each claw part 5B.
As a result, an arcuate corner portion 5C is left. When the piston 6 slides in the cylinder 4A due to the hydraulic pressure in the hydraulic pressure chamber 7, each claw part 5B presses each friction pad 8, which will be described later, against both sides of the disk 1 between the piston 6 and the piston 6. It's becoming like that.

[0006] Reference numerals 8 and 8 indicate inner and outer friction pads arranged across the disk 1,
Each of the friction pads 8 is disposed on the inner side between the disk 1 and the piston 6, and on the outer side between the disk 1 and each claw portion 5B of the outer leg portion 5,
It is movable in the axial direction of the disk 1. Here, each friction pad 8 consists of a lining 8A that frictionally engages with the disk 1, and a back metal 8B fixed to the back surface of the lining 8A, and a shim plate 9, which will be described later, is provided on the back surface of the back metal 8B. ing.

[0007] Reference numerals 9 and 9 indicate shim plates for preventing brake squeal, and each shim plate 9 is made of a thin metal plate 9A and rubber or synthetic resin coated on both sides of the thin metal plate 9A, as shown in FIG. Elastic material 9B, 9
It is composed of B. Here, each shim plate 9
are attached to the back surface of each back plate 8B, and are arranged between each friction pad 8, piston 6, and each claw portion 5B of the outer leg portion 5. The elastic material 9B of each shim plate 9 prevents the piston 6, each claw portion 5B, etc. from coming into metal-to-metal contact with the thin metal plate 9A, the back plate 8B, etc., and provides a brake squeal prevention effect. .

[0008] The disc brake according to the prior art has the above-mentioned configuration, and when the brake is operated, brake fluid is supplied into the hydraulic pressure chamber 7 through the fluid hole 4B, and the piston 6 is slid within the cylinder 4A.
By pressing each friction pad 8 against both sides of the disc 1 between the piston 6 and each pawl 5B of the outer leg 5, a braking action is applied to the disc 1.
Each shim plate 9 is connected to the back side 8B of each friction pad 8.
The elastic members 9B of each shim plate 9 prevent so-called brake squeal that occurs when each friction pad 8 and disk 1 come into contact with each other.

[0009]

[Problem that the invention attempts to solve] By the way,
In the above-mentioned prior art, the caliper 3 consisting of the inner leg 4, the outer leg 5, etc. is formed of casting or the like, and the outer leg 5 of the caliper 3 has an inverted U-shaped notch 5A. Since the forked claw portions 5B are formed by providing the forked claw portions 5B, the arcuate corner portions 5C located at the inner peripheral edge of the inner part between the claw portions 5B are formed into an edge shape. , burrs are likely to occur during casting.

[0010] On the other hand, when pressing each friction pad 8 and the disc 1 between the piston 6 and each claw part 5B of the outer leg part 5 during a brake operation, each of the claw parts 5B
The bottom end thereof is bent diagonally upward as shown by arrow A in FIG.
A pressing force shown as is applied.

[0011] Therefore, in the prior art, as shown in FIG. 6, when the brake is operated, the elastic material 9B of the shim plate 9 strongly hits the corner portion 5C between each claw portion 5B due to the pressing force in the direction of the arrow B. There is a drawback that the life of the shim plate 9 is significantly reduced due to wear or peeling caused by the corner portions 5C.

[0012] Therefore, some kind of countermeasure is desired for the inner corner portion 5C between each claw portion 5B, 5B, and conventionally, burrs etc. generated in this corner portion 5C have been manually removed. However, it is not only time-consuming, but also has the disadvantage that it may be forgotten to take it out.

[0013] The present invention was made in view of the above-mentioned shortcomings of the conventional technology, and the present invention can prevent the elastic material of the shim plate from being damaged by abrasion or peeling, and improve the lifespan of the shim plate. This provides a disc brake that enables

[0014]

[Means for solving the problem] In order to solve the above-mentioned problem, the feature of the means adopted by the disc brake according to the present invention is that the outer leg has a The contact relief portion with the shim plate is formed by machining, and the relief portion is formed in an arc shape having the same axis as the cylinder.

【0015】

[Function] According to the disc brake configured in this way, a contact relief part with the shim plate is formed by machining on the inner peripheral edge of the deep part between each pawl part, so corners and burrs etc. can be automatically removed. This prevents damage to the shim plate even if the shim plate is hit hard.

[0016]

[Embodiment] Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 4. In the embodiment, the same components as those of the prior art shown in FIGS. 5 and 6 described above are given the same reference numerals, and the explanation thereof will be omitted.

[0017] In the figure, reference numeral 11 indicates the caliper of this embodiment that is slidably supported by the mounting bracket 1, and the caliper 11 is formed almost the same as the caliper 3 described in the prior art, and has an inner inner wall on one side. The leg portion 12 is
Outer leg portions 13 are provided on the other side. The inner leg portion 12 has a cylinder 12A.
and a liquid hole 12B are formed, and the cylinder 12A can be finished into a cylindrical surface by drilling a cylinder hole 12A' shown by a two-dot chain line in FIG. 1 using a cutting tool 15, which will be described later. Furthermore, as shown in FIG. 2, the outer leg portion 13 is provided with an inverted U-shaped notch 13A, thereby forming forked claw portions 13B, 13B, and the deep portion between the claw portions 13B. At the inner peripheral edge thereof, a contact/release portion 14 for contacting the shim plate 9 is formed in an arc shape having the same axis as the cylinder 12, as will be described later.

15 is the cylinder hole 1 of the inner leg portion 12
2A' shows a cutting tool for drilling holes, and the cutting tool 15 is rotated by a lathe or the like around the central axis O-O, and fed in the directions of arrows X and Y to perform cutting. ing. Then, the byte 1
An inner hole machining blade 15A is provided on the tip side of 5,
A chamfering blade 15B is provided at a position axially spaced apart by a predetermined distance from the inner peripheral hole machining blade 15A.

[0019] Here, using the cutting tool 15, the cylinder hole 12A' of the caliper 11 and the contact relief part 1 are connected.
4 in the same process, first use the tool 15.
Insert the notch 1 of the outer leg 13 in the position shown in FIG.
3A, and while rotating around the central axis O-O, feed it in the direction of the arrow X, and drill the cylinder hole 12A' with the inner circumferential hole-cutting blade 15A.
A cylinder 12A is formed in the inner leg portion 12. Next, the cutting tool 15 is similarly rotated and sent in the direction of arrow Y, and the chamfered blade 15B forms the bifurcated claw portion 1.
As shown in FIG. 2, a contact release part 14 with the shim plate 9 is formed in the inner peripheral edge of the deep part between 3B and 13B in an arc shape. As a result, the corresponding relief part 14 is
It is formed with a predetermined inclination angle as shown inside.

[0020] The disc brake according to this embodiment has the above-mentioned configuration and is caliper-processed, and there is no particular difference in basic operation as a disc brake from that of the prior art.

[0021] However, in this embodiment, a contact release part 14 for contact with the shim plate 9 is formed by the chamfered blade 15B of the cutting tool 15 on the inner peripheral edge of the fork-shaped claw part 13B, located deep between the parts 13B. Therefore, the corners 5C, burrs, etc. described in the prior art can be automatically removed. As a result, each pawl portion 13
Even if the pressing force B shown in FIGS. 5 and 6 is applied to the inner part of the notch 13A in an inverted U shape, the elastic material 9B of the shim plate 9 will not wear out. The contact relief portion 14 can prevent the shim plate 9 from being damaged due to the shim plate becoming loose or peeling off, and the life of the shim plate 9 can be improved.

[0022] In addition, the cutting tool 15 includes an inner hole machining blade 1.
5A and a chamfering blade 15B are provided, and the cutting tool 15 is used to machine the hole of the cylinder 12A and the contact relief part 14.
This can be done in the same process, so there is no increase in man-hours, work efficiency can be improved, and the deburring work that was previously done by hand can be omitted. It is possible to reliably prevent the occurrence of forgetting to take the item. In addition, various effects such as no need for providing a shim cover to protect the shim plate 9 are achieved.

[0023] In the above embodiment, the outer leg portion 1
Although it has been described that the shim plates 9 are provided on the piston 6 side and the piston 6 side, the shim plate 9 on the piston 6 side is not necessarily provided because brake squeal may not occur on the piston 6 side.

【0024】

[Effects of the invention] As detailed above, according to the disc brake according to the invention, the inner peripheral edge of the disc brake is located deep between the forked pawls, and the contact with the shim plate is machined. Since the relief part is formed in an arc shape having the same axis as the cylinder, it is possible to reliably remove corners and burrs on the inner peripheral edge between each claw part.
Even if the tip of each pawl portion is deflected in the expansion direction during brake operation, the elastic material of the shim plate can be prevented from being damaged, and its life can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the state of machining of the caliper of this embodiment using a cutting tool.

FIG. 2 is a cross-sectional view in the direction of the arrow in FIG. 1 showing the outer leg with the cutting tool removed.

FIG. 3 is a cross-sectional view in the direction of the arrow in FIG. 2;

[Fig. 4] Fig. 3 showing the assembled state of friction pads etc.
FIG.

FIG. 5 is a longitudinal sectional view of a disc brake according to the prior art.

6 is an enlarged view of the main part in FIG. 5. FIG.

[Explanation of symbols]

1...disk 2...Mounting bracket 6...Piston 8...Friction pad 8A...Lining 8B……Secret money 9...Shim board 9A...Thin metal plate 9B...Elastic material 11...Kyaripa 12...Inner leg 12A...Cylinder 13... Outer leg 13A...notch 13B...Claw part 14... Hit-and-miss section.

Claims (1)

[Scope of utility model registration request] a mounting bracket, a caliper slidably supported by the mounting bracket, and an inner leg portion located on one side of the disk and provided on the caliper and having a cylinder formed on the inner peripheral side on which a piston slides. ,
an outer leg portion located on the other side of the disk and provided on the caliper and having a forked claw portion formed by an inverted U-shaped notch; a pair of friction pads that are pressed against both sides of the disk by the claws of the outer legs; and a back metal back of the friction pads located at least on the outer leg side; a disc brake provided with a shim plate provided between the outer leg portion and the shim plate, the outer leg portion having a contact relief portion with the shim plate formed by machining on the inner peripheral edge of the deep portion between each pawl portion; A disc brake characterized in that the corresponding relief portion is formed in an arc shape having the same axis as the cylinder.