JPH0738771U - Pad brake spring for disc brake - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pad return spring having a structure that can improve workability in assembling the disc brake. [Composition] A pad return spring for separating a pad that presses the disk rotor by a braking operation from the disk rotor when releasing the braking, and a mounting and fixing part having a spring piece that is mounted in the back hole of the caliper and presses the inner wall surface of the back hole. Is provided on the spring base. The pressure contact spring piece has a structure in which it is sandwiched between a pair of back holes formed in the caliper bridge,
Alternatively, when there is only one back hole, the structure is such that it is urged and fixed against the opposing inner wall surface to be fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake pad return spring, and more particularly to a return spring for urging a friction pad away from a disc rotor when braking is released.

[0002]

[Prior art]

 In the disc brake, the inner pad and the outer pad are pressed against the front and back surfaces of the disc rotor by the operation of the hydraulic cylinder to bring them into pressure contact with each other for braking action. Further, when the damping operation is released, it is necessary to separate the pad from the disc rotor to form a predetermined clearance between them in order to prevent the pad from dragging.

A conventional disc brake is provided with a pad return spring for moving the pad away from the disc rotor when releasing the brake. Such a return spring is usually composed of a V-shaped spring, which is arranged along the inner surface of the caliper, and the spring tips extended to the end portions of the inner and outer pads are bent into holes formed in the back metal of both pads. It is designed to be plugged in and connected (refer to the utility bulletin No. 4-107530). The return spring is closed while the pad is in pressure contact with the disk rotor to store elastic pressure, and by releasing the brake, the pad is biased toward the open leg to move away from the rotor surface.

[0004]

[Problems to be solved by the device]

 However, in the conventional V-shaped return spring structure, when the spring is inserted, the spring insertion hole formed in the pad backing metal has a small diameter, which makes it difficult to assemble the return spring to the pad. Also, after attaching the return spring to the pad backing metal, the caliper is assembled, but at this time, since the caliper is fixed across the pads, it is necessary to hold the pair of pads by hand so as to shrink the return spring. There was a problem that workability was very poor.

A first object of the present invention is to provide a disc brake pad return spring having a structure capable of improving the workability of assembling to a disc brake, focusing on the above conventional problems. Especially. Secondly, it is an object of the present invention to provide a pad return spring having a structure that can be assembled together with the work of assembling the caliper. Thirdly, it is an object of the present invention to provide a return spring structure in which a pad return spring can be attached and fixed to a caliper using a caliper back hole so as to be easily assembled. A fourth object is to provide a pad return spring capable of integrally performing pad return operation on the turn-in side and the turn-out side of the rotor. Fifth, to provide a pad return spring in which the pad and the spring can be returned without providing a connecting mechanism by inserting a hole.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a disc brake pad return spring according to the present invention is a pad return spring for separating a pad, which is pressed against a disc rotor by a braking operation, from the disc rotor when the brake is released. The base was provided with a fixed part for attachment to the caliper. In this case, the mounting and fixing portion is provided with a pressure contact spring piece that straddles a pair of back holes formed in the caliper bridge, or urges and urges against the inner wall surface of the back hole formed in the caliper bridge. The pressure contact spring piece may be provided.

[0007]

[Action]

 According to the above configuration, the pad return spring is attached to the caliper, the interval between the spring pieces is appropriately reduced by the jig to be smaller than the rotor wall thickness, and the caliper is assembled so as to sandwich the pad, and then the jig is attached. By removing the caliper, the return spring can be assembled at the same time. The return spring may be attached to the caliper by a pressure contact spring piece that sandwiches the inner wall surface of the back hole formed in the caliper bridge portion, whereby the return spring can be fixed using the caliper back hole portion. The spring piece extended from the base of the return spring is brought into contact with the inner surface of the pad backing metal to perform the pad returning action in the direction of separating from the rotor, so that engagement and connection work with the friction pad is not required. With the pad attached to the holder side, the caliper can be assembled by simply shortening the gap between the pair of spring pieces corresponding to the inner and outer pads when assembling the caliper. It will be.

[0008]

【Example】

 Hereinafter, a specific embodiment of the disc brake pad return spring according to the present invention will be described in detail with reference to the drawings.

1 and 2 are views showing the structure of a disc brake pad return spring according to an embodiment. First, the disc brake has a support 12 fixed to the vehicle body so as to straddle the disc rotor 10, and a pair of friction pads 14 and 16 composed of an inner and an outer are slidably guided in the rotor axial direction. The friction torques of the friction pads 14 and 16 are received. A caliper 18 is provided to press the friction pads 14 and 16 into pressure contact, which is a floating structure attached to the support 12 through a guide 20. A hydraulic cylinder mechanism 22 is provided on the inner portion of the caliper 18, which pressurizes the inner pad 14 toward the rotor surface, and the caliper pawl 24 extending to the outer side of the caliper 18 causes the outer pad 16 to move in the same manner. A braking action is performed by pressure-moving toward the surface.

In such a disc brake structure, a return spring 26 is attached to urge the friction pads 14 and 16 away from the disc rotor 10 when the hydraulic cylinder mechanism 22 is released and the brake is not applied. However, this is located between the inner surface of the caliper 18 and the outer edge portions of the friction pads 14 and 16, and the back hole 28 of the caliper 18 is used for fixing. For this reason, as shown in FIG. 2, the return spring 26 has a spring base portion 30 formed in a rectangular flat plate shape in the central portion, and opposite edges (short side portions in the embodiment) of the spring base portion 30. A pair of press-contact spring pieces 32 that are raised from above are provided. The press-contact spring piece 32 is raised with a space so that it can be inserted into the caliper back hole 28, and a bulging convex portion 34 is partially formed so that its tip end is elastically abutted against the inner wall surface of the back hole 28. However, by making the interval between the convex portions 34 larger than the interval size of the back hole 28, it is possible to fix and hold the caliper 18 to the inner surface portion by spring elasticity.

At a pair of edges (long sides) of the spring base portion 30 where the pressure contact spring pieces 32 are not formed, the spring base portions 30 are bent in the direction opposite to the pressure contact spring pieces 32, that is, toward the friction pads 14, 16 side. Four return spring pieces 36 extending from each bent portion to the rotor entry side and the rotor entry side are formed. Therefore, the return spring piece 36 is configured as a leaf spring, and the pair of spring pieces 36 extended to the rotor turning-in side and the rotor turning-out side are respectively expanded into V-shapes, and the inner and outer friction pads 14 are formed. , 16 of the shoes 14A, 16A are brought into contact with the inner surfaces of the backing plates 14B, 16B at the upper edges of the shoes 14A, 16A. A curved portion 36C is formed at the tip of the return spring piece 36 for smooth contact. As a result, the return spring 26 expands at the position closer to the rotor outlet side, and the pair of return spring pieces 36 that apply an expanding biasing force to the inner and outer pads 14 and 16 closer to the rotor inlet side. By the pair of return spring pieces 36 for applying an urging force, the return urging force in the direction away from the disk rotor 10 is applied so as to be moved uniformly and in parallel. Such a return spring 26 is formed by punching and bending a spring steel plate.

When the back holes 28 of the caliper 18 are two in series, the press-contact spring pieces 32 may be formed so as to sandwich the bridging member partitioning the back holes 28, which is a press-contact spring piece. It can be easily realized by adjusting the interval of 32 and the convex direction of the bulging convex portion 34.

An operation of assembling the return spring 26 having the above structure to the disc brake will be described with reference to FIG. With the friction pads 14 and 16 attached to the support 12, the return spring 26 is first attached to the inner surface of the caliper 18 as shown in FIG. This inserts a pair of pressure contact spring pieces 32 rising from the spring base 30 into the back hole 28, and presses the pressure contact spring pieces 32 against the inner wall surface of the back hole 28 to fix them. The example shown in FIG. 3 is intended for the caliper 18 having two back holes 28. Therefore, the crimping spring pieces 32 sandwich the bridge portion partitioning the back hole 26, and both side surfaces of the bridge portion are sandwiched. The inner wall surface of the back hole located at is sandwiched.

After attaching the return spring 26 to the caliper 18 in this way, as shown in FIG. 3B, a spring contraction jig 38 is used, and the interval between the return spring pieces 36 is smaller than the wall thickness of the rotor 10. Adjust so that Then, in this state, the caliper 18 is mounted on the support 12 so that the friction pads 14 and 16 are inserted, the guide 20 is assembled, and the jig 38 is removed from the side of the caliper 18. As a result, as shown in FIG. 3 (3), each return spring piece 36 of the return spring 26 expands, and the friction pads 14 and 16 are elastically biased in directions away from each other.

According to the above-described embodiment, the return spring 26 has a leaf spring structure, and it is not necessary to machine and bore spring fixing holes or the like in the friction pads 14 and 16 when assembling. Then, the return spring 26 is previously attached to the caliper 18, and the work of assembling the caliper 18 to the support 12 is the work of assembling the return spring 26 at the same time. The return spring 26 is attached to the caliper 18 alone separated from the assembly. Therefore, the workability is significantly improved.

Further, with such a structure of the friction pad 26, since the positional relationship between the outer pad 16 and the caliper 18 does not change when the pad is worn, only the leaf spring piece 36 on the inner pad 14 side is bent and returned. Since the spring 26 is slidable in the sliding direction of the caliper 18, the return spring 26 slides by the reaction force on the inner pad 14 side, and the same force is transmitted to the outer pad 16 side. can get.

[0017]

[Effect of device]

 As described above, the disc brake pad return spring according to the present invention is a pad return spring for separating the pad, which presses the disc rotor by the braking operation, from the disc rotor when the brake is released. Since the fixing part for mounting on the caliper is provided, the workability of assembling the disc brake can be improved. Further, after the return spring is attached to the caliper alone, it can be assembled to the disc brake assembly in association with the caliper assembling work, so that additional work such as adjusting the pad spacing is unnecessary. Further, since the return spring piece is simply brought into contact with the friction pad to generate the pad return force, it is possible to eliminate the work of connecting the pad and the return spring, and at the same time, it is not necessary to drill holes in the pad. The effect is obtained. There is also an advantage that the number of components is reduced because the pad return operation can be performed integrally with one return spring, rather than mounting return springs independently on the turn-in side and the turn-out side of the rotor.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a state in which a pad return spring according to an embodiment is assembled to a disc brake, and a relationship diagram between the return spring and a friction pad.

FIG. 2 is a perspective view, a plan view and a front view of the return spring.

FIG. 3 is an explanatory diagram of an assembly process of the return spring.

[Explanation of symbols]

 10 disk rotor 12 support 14 inner pad 16 outer pad 18 caliper 20 guide 22 hydraulic cylinder mechanism 24 caliper claw 26 return spring 28 back hole 30 spring base 32 pressure contact spring piece 34 bulging convex portion 36 return spring piece 38 spring contraction jig

Claims (3)

[Scope of utility model registration request] 1. A pad return spring for separating a pad, which is brought into pressure contact with a disk rotor by a braking operation, from the disk rotor when braking is released, wherein a spring base portion is provided with a mounting and fixing portion to a caliper. Brake pad return spring. 2. The pad return spring for a disc brake according to claim 1, wherein the mounting and fixing portion is provided with a pressure contact spring piece extending over a pair of back holes formed in the caliper bridge. 3. The disc brake according to claim 1, wherein the mounting and fixing portion is provided with a pressure contact spring piece that urges and urges against an inner wall surface of the back hole formed in the caliper bridge. Pad return spring.