JPH0628367U - 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 inner diameter of the elastic bush 14 to be larger than the outer diameter of the circumferential groove 5c, the elastic bush 1
A gap C1 is set between the inner peripheral surface 14a of No. 4 and the outer peripheral surface 5d of the peripheral groove 5c.

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 braking 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 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 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. A pin-slide type vehicle disc brake in which an annular elastic bush that slides in the insertion hole is fitted in a circumferential groove formed at the tip of the sliding pin while supporting the axial movement. The inner diameter of the elastic bush is formed to be larger than the outer diameter of the peripheral groove, and a gap is set between the inner peripheral surface of the elastic bush and the outer peripheral surface of the peripheral groove. .

[0006]

[Action]

 According to this structure, when the sliding pin moves in the insertion hole while deforming the elastic bush at the time of inserting the sliding pin or braking, the elastic bush is provided with the gap set between the elastic bush and the circumferential groove. Since it is deformed inside the insertion hole, 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 protruding 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 5a of the sliding pin 5 is fixed to the mounting arm 4f by a mounting bolt 12 respectively. The shaft portion 5b of the sliding pin 5 has a diameter slightly smaller than that of the insertion hole 3b, and a gap C2 is defined between the shaft portion 5b and the inner wall 3c of the insertion hole 3b. In this sliding pin 5, the base portion 5a protruding from the insertion hole 3b is covered with a boot 13b that is integral with the annular seal 13a, and the base end side of the shaft portion 5b is located inside the opening portion of the insertion hole 3b. The annular seal 13a is fitted and the tip side is elastically supported by an elastic bushing 14, respectively.

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, and has an inner diameter larger than the outer diameter of the circumferential groove 5c. A gap C1 is set between the outer peripheral surface 5d and the outer peripheral surface 5d of the peripheral groove 5c.

The gap C1 is narrower than the above-mentioned gap C2 set between the shaft portion 5b and the inner wall 3c of the insertion hole 3b, and the shaft portion 5b is inserted into the insertion hole due to vehicle vibration. The inner wall 3c of 3b is struck to prevent the tapping sound from being generated. Further, during braking, the elastic bush 14 is dragged by the movement of the sliding pin 5, and the elastic bush 14 is deformed by the sliding resistance with the outer peripheral surface 5d of the peripheral groove 5c, but the gap C1 allows this deformation. It is an area to do.

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 through the insertion hole 3b toward the opening side, and the elastic bush 14 also slides in the sliding pin 5 in the same direction. The elastic bush 14 dragged by the sliding pin 5 is deformed inward by a gap C1 set between the outer peripheral surface 5d of the peripheral groove 5c and the deformed portion is accommodated in the gap C1 and slides through the insertion hole 3b. To do.

In this embodiment, the elastic bush 14 sliding in the insertion hole 3b can be deformed inward, and the deformed portion is accommodated in the gap C1. Thus, the elastic bush 14 and the insertion hole 3b are separated. Since the sliding resistance with the inner wall 3c is reduced, the movement of the sliding pin 5 becomes smooth, 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 C1 as in the above braking. 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.

[0017]

[Effect of device]

 In the pin slide type vehicle disc brake of the present invention, the gap is set between the inner peripheral surface of the elastic bush and the outer peripheral surface of the peripheral groove into which the elastic bush is fitted. This is an area where the elastic bush is allowed to deform and the sliding resistance between the elastic bush and the insertion hole is reduced, so when inserting into the insertion hole or braking, move the sliding pin smoothly into the insertion hole, The caliper body can be operated smoothly. Further, since the caliper body can be easily returned to the predetermined non-actuated position, the possibility that the lining of the friction pad is dragged by the disc rotor and unevenly worn is reduced. 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.

4 is a sectional view taken along the line IV-IV in FIG.

[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 5d provided at the tip of the shaft portion 5b 5d ... Outer peripheral surface of the circumferential groove 5c 7 ... Piston 8 ... Cylinder hole 11 ... Friction pad 11a ... Lining 13a ... Annular seal 14 ... Elastic bush 14a ... Inner peripheral surface of elastic bush 14 C1 ... Gap between inner peripheral surface 14a of elastic bush 14 and outer peripheral surface 5d of peripheral groove 5c C2 ... Gap between shaft portion 5b and inner wall 3c of insertion hole 3b

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,
The pin slide is supported by the guide of the sliding pin so as to be movable in the axial direction of the disk, and an annular elastic bush that slides in the insertion hole is fitted in a peripheral groove formed at the tip of the sliding pin. Type vehicle disc brake, the inner diameter of the elastic bush is formed to be larger than the outer diameter of the peripheral groove, and a gap is set between the inner peripheral surface of the elastic bush and the outer peripheral surface of the peripheral groove. A disc brake for a pin slide type vehicle, which is characterized in that