JPH0628369U - Pin slide type vehicle disc brake - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the resistance when the sliding pin moves through the insertion hole, and to enable smooth insertion / removal of the sliding pin and operation of the caliper body. Prevents uneven wear of the lining. Increase the durability of the elastic bush. [Structure] An annular elastic bushing 14 is fitted in a circumferential groove 5c formed in a sliding pin 5. By forming the length L1 of the circumferential groove 5c longer than the length L2 of the elastic bush 14,
A gap C3 for accommodating the deformed portion of the elastic bush 14 is set between c and the elastic bush 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pin slide type vehicle disc brake mounted on a vehicle such as an automobile or a motorcycle, and more particularly to a structure of an elastic bush provided on a sliding pin for guiding a caliper.

[0002]

[Prior art]

 In a pin-slide type disc brake that performs a braking action by moving the caliper body in the disc axial direction with the guide of the sliding pin, the sliding pin vibrates inside the insertion hole or strikes the insertion hole to generate a tapping sound. Therefore, as disclosed in, for example, Japanese Utility Model Laid-Open No. 1-150230, it is known that an annular elastic bush is fitted in a circumferential groove formed on the tip side of a slide pin.

[0003]

[Problems to be solved by the device]

 However, since the elastic bush described above is formed into a cylindrical shape with a diameter larger than the insertion hole, it is difficult to insert the sliding pin, and after assembly, there is a large resistance to the movement of the sliding pin. This may impede the smooth operation of the caliper body. Further, although the fitting is tight at the beginning of the assembling, since the sliding resistance applied to the elastic bushing is large, the elastic bushing is liable to be worn or worn away as the use is advanced.

The present invention has been made in view of such circumstances, and its purpose is to smoothly move the sliding pin inside the insertion hole to smoothly operate the caliper body. , To provide a disk brake for vehicles with improved durability of the elastic bush.

[0005]

[Means for Solving the Problems]

 According to the present invention, in accordance with the above-mentioned object, a pair of caliper support arms extending in the disk axial direction to the outside of the disk rotor from a caliper bracket fixed to the vehicle body, and the disk rotor between the caliper support arms. A sliding pin is provided to project on one of the caliper bodies that are disposed straddling, and an insertion hole for accommodating this sliding pin is formed on the other side, and the caliper body is guided by the sliding pin to a disc. In a pin slide type vehicle disc brake, which is movably supported in the axial direction and has an annular elastic bush fitted in a circumferential groove formed at the tip of a sliding pin, the length L 1 of the circumferential groove is Is formed longer than the length L2 of the elastic bush, and a gap C3 is set between the peripheral groove and the side end of the elastic bush.

[0006]

[Action]

 According to this structure, when the sliding pin moves in the insertion hole while deforming the elastic bush during insertion of the sliding pin or during braking, the elastic bush deforms in the axial direction of the insertion hole due to the gap C3. Therefore, the sliding resistance between the elastic bush and the insertion hole is reduced.

[0007]

【Example】

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

In the disc brake 1, a pair of caliper support arms 3a and 3a extending over the outer periphery of the disc rotor 2 in the disc axial direction is provided on a bracket 3 fixed to the vehicle body at one side of the disc rotor 2. Between the caliper support arms 3a, 3a, a caliper body 4 is provided with sliding pins 5 projecting from the mounting arms 4f, 4f on both sides of the caliper support arm 3a. It is movably supported in the disc axial direction by being inserted through the insertion hole 3b.

In the caliper body 4, the action portion side piece 4 a and the reaction portion side piece 4 b, which are divided into two parts from the outside of the disc rotor 2, are integrated by four connecting bolts 6. And a reaction portion 4d, which are opposed to each other, and a bridge portion 4e which connects them to each other across the outer circumference of the disk rotor 2. The action portion 4c has the above-described mounting arms 4f, 4f, a cylinder hole 8 for accommodating the piston 7, and an inlet port for introducing a pressure liquid into the hydraulic chamber 9 between the piston 7 and the cylinder hole 8. 10 and the reaction portion 4d is provided with a reaction force claw 4g.

Between the piston 7 and the reaction force claw 4g, a pair of friction pads 11 and 11 are arranged so as to face each other with the disc rotor 2 interposed therebetween, and the pressurized liquid is supplied to the hydraulic chamber 9 through the inlet port 10. Then, the piston 7 moves forward in the cylinder hole 8 toward the disc rotor and presses the one friction pad 11 against one side surface of the disc rotor 2. Next, by this reaction, the caliper body 4 moves toward the working portion 4c while being guided by the sliding pins 5 and 5, and the reaction force claw 4g causes the other friction pad 11 to move to the other side of the disc rotor 2. By pressing it to the side surface, the braking action is performed.

The base portion 5a of the sliding pin 5 is fixed to the mounting arm 4f with a mounting bolt 12, and the shaft portion 5b which is inserted into the insertion hole 3b formed in the caliper support arm 3a has an insertion hole. The diameter is slightly smaller than 3b. In this sliding pin 5, a base portion 5a protruding from the insertion hole 3b is covered with a boot 13b integral with an annular seal 13a, and a base end side of the shaft portion 5b is fitted to an inner circumference of an opening portion of the insertion hole 3b. It is elastically held by the annular seal 13a and the elastic bush 14 on the tip side.

FIG. 1 is a detailed view of the tip of the sliding pin 5. A peripheral groove 5c is provided at the tip of the shaft 5b, and the elastic bush 14 is fitted in the peripheral groove 5c. . The elastic bush 14 is formed in a cylindrical shape from rubber or soft synthetic resin. The length L1 of the circumferential groove 5c is formed longer than the length L2 of the elastic bush 14, and when the bush 14 is fitted into the circumferential groove 5c, the elastic bush 14 and the circumferential groove 5c are not separated from each other. In the meantime, the gap C1 + the gap C2 = the gap C3 is set.

The gap C1 corresponds to the amount of wear of the lining 11a for one braking operation, and the gap C2 is the amount of deformation (deflection amount) of the caliper body 4 during braking + the amount of compressive deformation of the lining 11a during braking. Further, the gap C3 corresponds to the amount of deformation of the elastic bush 14 dragged by the sliding pin 5 during braking.

The present embodiment is configured as described above, and in the elastic bush 14 fitted in the circumferential groove 5c of the sliding pin 5, the outer peripheral surface 14a contacts the inner wall 3c of the insertion hole 3b, The tip side of the sliding pin 5 is elastically held. During braking, the sliding pin 5 moves integrally with the caliper body 4 to the opening side of the insertion hole 3b while filling the gap C2 with the elastic bush 14, and the elastic bush 14 also slides. It is dragged by 5 and moves in the same direction.

When the gap C2 is filled by the movement of the sliding pin 5, a gap C3 (= the length L1 of the circumferential groove 5c) obtained by adding the gap C1 and the gap C2 to the insertion hole opening side of the elastic bush 14 is formed. The length L2 of 14 is generated, and this gap C3 is a region in which the deformation of the elastic bush 14 is allowed. The elastic bush 14 dragged by the sliding pin 5 is deformed in the axial direction of the insertion hole 3b, and the deformed portion is housed in the gap C3.

When the above-mentioned braking is released, the sliding pin 5 moves toward the bottom of the insertion hole through a gap C2, which is the gap C3 minus the wear amount C1 for one stroke of the lining 11a, and is inoperative. Return to position. In the non-actuated position, as in FIG. 1, a gap C1 is set on the side of the insertion hole of the elastic bush 14 and a gap C2 is set on the side of the bottom of the insertion hole of the elastic bush 14.

In this embodiment, the clearance C3 set between the circumferential groove 5c and the elastic bush 14 reduces the sliding resistance between the elastic bush 14 and the insertion hole 3b during braking. The sliding pin 5 moves smoothly, and the caliper body 4 can be operated well. Further, since the caliper body 4 can be easily returned to the predetermined position when the braking is released, the possibility that the lining 11a of the friction pad 11 is dragged by the disc rotor 2 to be unevenly worn is reduced.

Further, even when the sliding pin 5 is inserted into the insertion hole 3b or pulled out for maintenance or replacement, the deformed portion of the elastic bush 14 is accommodated in the gap C3 as in the case of braking described above. The sliding resistance with the insertion hole 3b is reduced, and the sliding pin 5 can be inserted and removed smoothly. Further, due to the reduction of the sliding resistance, the elastic bush 14 is less likely to be worn or worn down, so that the durability of the elastic bush 14 is improved.

[0019]

[Effect of device]

 In the disk brake for a pin slide type vehicle of the present invention, the length L1 of the circumferential groove formed at the tip of the sliding pin is formed longer than the length L2 of the elastic bush fitted in the circumferential groove. By setting the gap C between the peripheral groove and the side end of the elastic bush, the gap C3 between the elastic bush and the peripheral groove becomes a region in which the elastic bush can be deformed, and the gap between the elastic bush and the insertion hole is formed. Since the sliding resistance is reduced, the sliding pin can be smoothly moved to the insertion hole when it is inserted into the insertion hole or controlled, and the caliper body can be operated smoothly. Further, since the caliper body can be easily returned to the predetermined non-actuated position, it is less likely that the friction pad lining is dragged by the disc rotor to cause uneven wear. Further, wear of the elastic bush such as fatigue and wear is less likely to occur, so that the durability of the elastic bush is improved.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of FIG.

FIG. 2 is a plan view of a disc brake showing an embodiment of the present invention.

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

FIG. 4 is a perspective view of an elastic bush.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Bracket 3a ... Caliper support arm 3b ... Insertion hole into which sliding pin 5 is inserted 4 ... Caliper body 4a ... Working portion 4b ... Reaction portion 5 ... Sliding pin 5a ... Sliding pin 5 5b ... Shaft portion 5c of the sliding pin 5 ... Circumferential groove provided at the tip of the shaft portion 5b 7 ... Piston 8 ... Cylinder hole 11 ... Friction pad 11a ... Lining 13a ... Annular seal 14 ... Elastic bush 14a ... Elastic bush Outer peripheral surface of 14 L1 ... Length of circumferential groove 5c L2 ... Length of elastic bush 14 C3 ... Gap set between elastic bush 14 and circumferential groove 5c

Claims (1)

[Scope of utility model registration request] 1. A pair of caliper support arms extending from the caliper bracket fixed to the vehicle body to the outside of the disc rotor in the disc axial direction, and the disc rotor is disposed between the caliper support arms. A sliding pin is projected on one of the caliper bodies, and an insertion hole for accommodating the sliding pin is formed on the other side of the caliper body,
In a pin slide type vehicle disc brake, which is movably supported by the guide of the sliding pin in the disc axial direction and has an annular elastic bush fitted in a circumferential groove formed at the tip of the sliding pin, A disc brake for a pin slide type vehicle, wherein a length L1 of the circumferential groove is formed longer than a length L2 of the elastic bush, and a gap C3 is set between the circumferential groove and a side end of the elastic bush. .