JP2560988Y2 - Pin slide type vehicle disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a pin-slide type vehicle disk brake mounted on an automobile or a motorcycle, and more specifically, provided on a slide pin for caliper guide. The present invention relates to a mounting structure for an elastic bush.

[Conventional technology]

In a pin-slide type disc brake, a slide pin protruding from a caliper may vibrate inside an insertion hole formed in a support arm of a bracket or hit the insertion hole to generate a tapping sound. As shown in Japanese Unexamined Patent Publication No. 1-150230, a rubber bush that slides through the insertion hole is fitted near the tip of the slide pin.

[Problems to be solved by the invention]

However, this rubber bush is inferior in assemblability because the slide pin and the rubber bush are manufactured separately and the rubber bush is fitted to the slide pin. Also,
Since the rubber bush is formed in a cylindrical shape having a diameter larger than that of the insertion hole, when the slide pin is inserted, the insertion hole is closed to prevent the discharge of the internal air, thereby making it difficult to insert the slide pin. . Furthermore, after assembly, a large sliding resistance with respect to the slide pin impedes smooth movement of the caliper, and the friction pad during non-braking cannot be sufficiently separated from the disk rotor. It may cause abnormal wear.

Also, although the fitting is tight at the beginning of the assembly, the frictional resistance is large, so as the use progresses,
The elastic bush is liable to be worn, such as set or fray.

The present invention has been made in view of such circumstances, and its purpose is to have excellent assemblability and
It is an object of the present invention to provide a disc brake that can smoothly insert and slide a slide pin while suppressing the hitting sound and vibration of the slide pin and has excellent durability.

[Means for solving the problem]

According to the present invention, in accordance with the above-described object, a pair of support arms extending over the outer periphery of a disk rotor are extended from a bracket fixed to a vehicle body, and a caliper is protruded from an insertion hole formed in the support arm. A pin-sliding type vehicle disk brake, in which a slide pin is inserted to support the caliper so as to be movable in the disk axial direction, and an elastic bush that slides through the insertion hole is provided at the tip of the slide pin.
In the vicinity of the tip of the slide pin, a plurality of binding holes intersecting the center axis of the slide pin and penetrating linearly in the radial direction are provided, and on the center axis of the slide pin, An elastic material injection hole communicating with the intersection of the plurality of binding holes is provided, and an elastic material such as rubber is filled into the plurality of binding holes from the elastic material injection hole, and the elastic material is bonded to the plurality of binding holes. The elastic bush is formed by swelling from a slide pin outer peripheral surface opening of the hole.

[Action]

According to this configuration, the bulging portion of the elastic bush bulging from the slide pin outer peripheral surface openings of the plurality of binding holes comes into intermittent contact with the inner peripheral wall of the insertion hole, and the contact area with the insertion hole is reduced. When the slide pin is inserted into the insertion hole while the sliding resistance is suppressed to a small value, the air inside the insertion hole swells from the outer peripheral surface openings of the slide pin of the plurality of connection holes, and the air flows from the gap of the elastic bush to the outside. And the resistance at the time of insertion decreases.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The disc brake 1 is provided with a pair of support arms 3a, 3a straddling the outer periphery of the disc rotor 2 on a bracket 3 fixed to the vehicle body on one side of the disc rotor 2, and between the two support arms 3a, 3a. , The caliper 4 has mounting arms 4d on both sides,
Insert each slide pin 5 protruding from 4d into the insertion hole 3b of the support arm 3a.
And supported so as to be movable in the disk axial direction.

The caliper 4 includes an action portion 4a and a reaction portion 4b arranged on both sides of the disk rotor 2, and
And a bridge portion 4c connected across the outer periphery of the mounting portion 4a, and the mounting arms 4d, 4d are provided so as to protrude from both sides of the action portion 4a. A cylinder-shaped hole 4e, which is formed on the action portion 4a with the disk rotor side opened, is provided with a cup-shaped liquid-tightly moving in the direction of the disk rotor by a pressure liquid supplied to a hydraulic chamber defined at the bottom. The piston 6 is interpolated,
Further, a pair of friction pads 7, 7 are arranged between the action part 4a and the reaction part 4b so as to face each other with the disk rotor 2 interposed therebetween.

Each friction pad 7 is constituted by fixing a lining 8 slidably in contact with the disk rotor 2 to a back plate 9 held by the bracket 3, and these friction pads 7, 7 project from both sides of the back plate 9. The hanging piece 9a is locked to a locking step provided opposite to the inside of the support arms 3a, 3a, and is suspended on both sides of the disk rotor 2 so as to be movable in the disk axial direction. The pad spring 10 is urged toward the center of the disc by the elastic force of the pad spring 10 contracted inside the bridge portion 4c.

The base 5a of the slide pin 5 is attached to a mounting bolt 11
The shaft 5b, which is fixed to the mounting arm 4d and is inserted through the insertion hole 3b formed in the support arm 3a, is formed to have a slightly smaller diameter than the insertion hole 3b. This slide pin 5 is inserted into the insertion hole 3b.
The base 5a projecting from the boot 1 is integrated with the annular seal 12a.
The base end side of the shaft portion 5b is covered by the annular seal 12a fitted to the inner periphery of the opening of the insertion hole 3b, and the distal end side is held by the support arm 3a by the elastic bush 13 respectively. I have.

In the vicinity of the tip of the shaft portion 5b of the slide pin 5, there are provided three connecting holes 14 which penetrate the slide pin 5 in a straight line in the radial direction crossing the center axis of the slide pin 5, and are provided on the center axis of the slide pin 5. An elastic material injection hole 15 is provided for communicating the tip surface 5c of the slide pin 5 with the intersection of the three binding holes 14. The binding hole 14 extends radially from the center axis of the slide pin 5 in the radial direction, and opens long in the axial direction of the slide pin 5 on the outer peripheral surface of the shaft portion 5b.

The elastic bush 13 has three connecting holes from the elastic material injection hole 15.
14 is filled with an elastic material such as rubber, and the elastic material is formed by swelling from the outer peripheral surface opening of the slide pin of the three connection holes 14. The bulging portion 13a bulging out of the slide pin outer peripheral surface opening of each binding hole 14 has a protruding shape that is long in the axial direction of the slide pin 5, and the amount of protrusion is the same as or slightly larger than the insertion hole 3b. The outer surface is formed in a semi-cylindrical shape so that the contact area with the insertion hole 3b is reduced.

The present embodiment is configured as described above. When the hydraulic fluid is supplied to the hydraulic chamber at the bottom of the cylinder hole, the piston 6 advances through the cylinder hole 4e, and the friction pad 7 Then, the caliper 4 moves toward the action portion 4a by this reaction, and the reaction portion 4b presses the other friction pad 7 against the other side of the disk rotor 2 to perform a braking action.

Further, the slide pins 5, 5 move integrally with the caliper 4 during the above-described operation, and the elastic bush 13 slides through the insertion hole 3b. 13
Since the slide pin 5 is tilted integrally with the caliper 4 due to the braking action, the distal end side of the shaft portion 5b does not hit the inner peripheral wall of the insertion hole 3b,
Vibration and tapping noise are prevented. Further, since the elastic bush 13 is made of an elastic material which is solidly filled in the three binding holes 14, it does not fall off the slide pin 5 due to sliding resistance, and furthermore, the elastic material is injected. An elastic material such as rubber is filled into the three binding holes 14 from the hole 15 and the elastic material is
Since it is formed by swelling out from the opening of the outer peripheral surface of the slide pin in the connection hole 14 of the strip, the assembling property to the slide pin 5 is good.

Further, since the elastic bush 13 of the present embodiment is divided into the six bulging portions 13a as described above, when the slide pin 5 is inserted into the insertion hole 3b, the internal air passes through 16 quickly. The insertion work can be performed smoothly in a short time. Further, since the sliding resistance at the time of operation is suppressed to a small value, the movement of the caliper 4 becomes smooth, and the friction pad 7 is prevented from being quickly worn or unevenly reduced due to dragging. In addition, since the outer surface of the bulging portion 13a has a semi-cylindrical shape and is in line contact with the insertion hole 3b, the sliding resistance is extremely small. Further, since the abrasion of the swollen portion 13a is reduced by the reduced sliding resistance, it has excellent durability even for long-term use.

[Effect of the invention]

The elastic bush of the pin-slide type vehicle disk brake of the present invention is made of an elastic material which is solidly filled in a plurality of binding holes, so that it does not fall off the slide pin due to sliding resistance, and A plurality of binding holes are filled with an elastic material such as rubber from the elastic material injection hole, and the elastic material is formed by swelling out of the slide pin outer peripheral surface openings of the plurality of binding holes. Is easy to assemble.

Also, since the elastic bush of the present invention is divided into a plurality of bulging portions, when inserting the slide pin into the insertion hole, the internal air is quickly discharged through the gap between the bulging portions. Thus, the insertion operation can be performed smoothly in a short time.
Further, since the sliding resistance during operation can be suppressed to a small value, the movement of the caliper is smooth, and the friction pad does not suffer from early wear or uneven decrease due to drag, and has excellent durability even for long-term use.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a disc brake showing one embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Bracket, 3a ... Support arm, 3b ... Insertion hole, 4 ... Caliper, 4d ...
Mounting arm, 7: friction pad, 5: slide pin, 5c: tip surface of slide pin, 13: elastic bush, 13a: bulging part, 14: binding hole, 15: elastic material injection hole, 16: bulging part Gap between

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of support arms extending over the outer periphery of a disk rotor are extended from a bracket fixed to a vehicle body, and slide pins protruding from a caliper are inserted into through holes formed in the support arms. In a pin-slide type vehicle disc brake, the caliper is inserted to support the caliper so as to be movable in the disc axis direction, and an elastic bush that slides through the insertion hole is attached to a tip end of the slide pin. A plurality of binding holes are provided in the vicinity of the tip of the slide pin so as to cross the center axis of the slide pin in a straight line in the radial direction, and on the center axis of the slide pin, the tip face of the slide pin and the plurality of An elastic material injection hole communicating with the intersection of the binding holes is provided, and the plurality of binding holes are filled with an elastic material such as rubber from the elastic material injection holes, and the elastic material slides through the plurality of binding holes. Pin outer surface opening Pin slide type vehicular disk brake, characterized in that the formation of the elastic bushing by Luo bulge.