JP2552078Y2 - Disc brake device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION In the present invention, a pair of support arms arranged on both sides of a brake disc are provided on a fixed bracket, and a brake caliper straddling the brake disc slides in parallel with the rotation axis of the brake disc. A friction pad is slidably supported by the bracket via a pin, and friction pads respectively interposed between both surfaces of the brake disc and between the brake calipers are supported on the support arm via a retainer. The present invention relates to a disk brake device to which a pad spring that elastically urges a pad in a direction in which the pad is supported by the support arm is attached.

[0002]

2. Description of the Related Art Conventionally, such a disc brake device has
For example, it is already known from Japanese Utility Model Laid-Open No. 2-143532.

[0003]

By the way, in the above-mentioned prior art, a sliding pin fixed to a brake caliper is slidably fitted to a bracket, so that the sliding pin is moved in a direction parallel to the rotation axis of the disc brake. Sliding operation of the brake caliper is allowed. However, at the time of braking in which the friction pads are pressed against both surfaces of the brake disc, the brake caliper is prevented from following the brake disc together with the friction pad and moving in the rotation direction of the brake disc by the minute gap between the sliding pin and the bracket. Without
When the brake caliper turns sharply in the rotation direction,
Abnormal noise is generated by the impact of the sliding pin on the bracket.

The present invention has been made in view of such circumstances, and has as its object to provide a disc brake device which prevents the occurrence of the abnormal noise during braking.

[0005]

According to the present invention, the retainer is provided with an elastic support portion, and the pad spring contacts the outer surface of the friction pad and contacts the outer surface of the friction pad. An abutting portion is provided for abutting on the support of the retainer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 is a partially cutaway plan view, and FIG.
FIG. 3 is a perspective view of the pad spring.

Referring first to FIGS. 1 and 2, a fixed bracket B is provided with a brake disc D which rotates with wheels.
A bracket main part 1 disposed opposite to one surface of the brake disk D; and support arm parts 3a, 3b provided at both ends of the bracket main part 1 along the circumferential direction of the brake disk D and facing one surface of the brake disk D; Support arms 4a, 4b facing the other surface of the brake disc D at positions corresponding to the support arms 3a, 3b, and between the support arms 3a, 4a across the brake disc D and between the support arms 3b, 3b. Connecting portions 5a and 5b for connecting between the supporting arms 4b, respectively.
and a tie bar 6 for integrally connecting the a and 4b, and a pair of screw holes 7, 7 for fastening to a knuckle (not shown) of an automobile are formed in the bracket main part 1.

The brake caliper C is formed so as to straddle the brake disc D with friction pads Pa and Pb interposed between the brake caliper D and both surfaces of the brake caliper D, and in a direction parallel to the rotation axis of the brake disc D. And is supported by the bracket B. That is, the brake caliper C is connected to one of the friction pads Pa
, A second pinching arm 9 abutting against the rear surface of the other friction pad Pb, and a bridge section connecting the two pinching arms 8, 9 across the brake disc D A piston 12 having a rear surface facing the hydraulic chamber 11 and a front surface contacting the friction pad Pa is slidably fitted in the first pinching arm portion 8. A boot 13 is provided between the piston 12 and the first pinching arm 8.

[0010] Both connecting portions 5a and 5b of the bracket B include:
Sliding hole 1 with bottom parallel to the rotation axis of brake disc D
4, 14 are provided. On the other hand, sliding pins 15, 15 slidably fitted into the two sliding holes 14, 14 are respectively provided on the first pinching arm 8 of the brake caliper C.
6 and 16, each sliding pin 15, 15
Boots 17 and 1 are provided between the base end of the
7 are provided.

In the back metal 18 of the friction pads Pa and Pb, shoulders 18a and 18b are provided at both ends along the circumferential direction of the brake disk D, respectively. Also, the shoulder 1 is attached to the support arms 3a, 3b; 4a, 4b of the bracket B.
Step portions 19a and 19b corresponding to 8a and 18b are provided, respectively. Thus, the shoulders 18 of the friction pads Pa, Pb
a and 18b are retainers 2 made of wear-resistant thin plates which are respectively engaged with both connecting portions 5a and 5b of the bracket B.
It is supported by the steps 19a and 19b via 0 and 20 respectively. Moreover, each retainer 20, 20 is provided with a bracket B at intervals along the circumferential direction of the brake disc D.
Support portions 20a, 20a facing the connecting portions 5a, 5b of the brake disk D extend outward of the brake disc D and are provided integrally.
The support portions 20a have elasticity. Further, in order to prevent the friction pads Pa, Pb from being perturbed on the steps 19a, 19b, the back metal 1 of both friction pads Pa, Pb is used.
A pad spring 21 is interposed between the brake caliper 8 and the bridge portion 10 of the brake caliper C.

Referring to FIG. 3 as well, a rectangular opening 22 is provided in the bridge portion 10 of the brake caliper C, and a pad spring 21 is engaged with and fixed to the opening 22. Part 23, and a pair of arm parts 2 extending from the fixed part 23 on both sides in the circumferential direction of the brake disc D
4 and 24, and contact portions 25 and 25 that are respectively provided at the tips of the arms 24 and 24.

The fixing portion 23 is formed in a rectangular flat plate smaller than the opening 22 and has a long hole 26 in the center in the longitudinal direction at the center thereof, and is engaged with outer edges at both ends in the longitudinal direction of the opening 22. Engaging claws 28, 28 connected to both ends of the substrate 27, and engaging flanges 29, 29 connected to both sides of the substrate 27 to engage with inner surfaces of both sides of the opening 22.
, And engaging claws 30, 30 formed by cutting and raising a part of each of the engaging flanges 29, 29 to engage with both side edges of the opening 22, respectively.

The arms 24 extend from the longitudinal center of the base plate 27 of the fixed portion 23 to both sides in the circumferential direction of the brake disk D. To be tilted. Thus, the fixing portion 23 and the arms 24, 24 are formed so as to have a mountain shape as a whole.

The contact portions 25, 25 are connected to the ends of the arms 24, 24 in a substantially T-shape, and are provided at the shoulders 18a, 18 of the friction pads Pa, Pb.
b and the support portions 20a, 20a of the retainers 20, 20, are formed in a substantially C-shaped cross section so as to abut on both.

Next, the operation of this embodiment will be described. The piston 12 built in the first pinching arm portion 8 of the brake caliper C has a hydraulic chamber 11 corresponding to a braking operation.
When the friction pad Pa is pressed toward the brake disc D due to the increase in the hydraulic pressure, the reaction force acts on the brake caliper C. Thus, the brake caliper C is
The brake caliper C is slidably supported in the axial direction of the brake disc D via the brackets B and 5 and moves in the direction opposite to the direction in which the piston 12 is pressed by the brake caliper C. Is pressed against the brake disc D by the second pinching arm 9. Therefore, the friction pads P are applied to the brake disc D from both sides thereof.
a and Pb are pressed to obtain a braking force.

At the time of such braking, the brake caliper C follows the rotation of the brake disc D together with the friction pads Pa and Pb due to the friction between the brake disc D and the friction pads Pa and Pb. Attempts to rotate by the minute gap between the sliding holes 14 and 14. Thus, the fixing portion 23 of the pad spring 21 is fixed to the bridge portion 10 of the brake caliper C, and the support portions of the retainers 20, 20 interposed between the friction pads Pa, Pb and the bracket B. 20a, 20
The contact portions 25 of the pad spring 21 are in contact with a. Moreover, since the support portions 20a, 20a are opposed to the bracket B at intervals in the circumferential direction of the brake disc D and have elasticity, the support portions 20a, 20a bend by the action of the force from the pad spring 21 to exert the spring force. Will be. Therefore, when the brake caliper C rotates following the rotation of the brake disc D, the supporting portion 20a pressed by the pad spring 21 with the rotation causes the spring force opposing the rotation of the brake caliper C to rotate. And the rapid rotation of the brake caliper C is suppressed. Therefore, it is possible to surely prevent the sliding pins 15, 15 from hitting the inner surfaces of the sliding holes 14, 14 and generating abnormal noise.

[0018]

As described above, according to the present invention, the retainer is provided with the elastic supporting portion, and the pad spring is in contact with the outer surface of the friction pad and also in contact with the supporting portion of the retainer. Since the contact portion is provided, the spring force against the rotation of the brake caliper that follows the rotation of the brake disc during braking is exerted by the support portion, and the sudden rotation of the brake caliper is suppressed to prevent generation of abnormal noise. can do.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of one embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a perspective view of a pad spring.

[Explanation of symbols]

 3a, 3b, 4a, 4b: Support arm 15: Slide pin 20: Retainer 20a: Support 21: Pad spring 25: Contact part B: Bracket C・ ・ ・ Brake caliper D ・ ・ ・ Brake disc Pa, Pb ・ ・ ・ Friction pad

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of support arms (3a, 4a; 3b, 4) arranged on both sides of a brake disc (D), respectively.
b) is provided on a fixed bracket (B), and a brake caliper (C) straddling the brake disc (D) is moved via a slide pin (15) parallel to the rotation axis of the brake disc (D). ) Is slidably mounted on the support arms (3a, 4a; 3b, 4b), and friction pads (Pa, Pb) interposed between both surfaces of the brake disc (D) and between the brake calipers (C), respectively. ) Is supported via a retainer (20), and the brake caliper (C) is elastically biased in a direction in which the friction pads (Pa, Pb) are supported by the support arms (3a, 4a; 3b, 4b). In a disc brake device to which a pad spring (21) to be mounted is attached, a retainer (20) is provided with an elastic supporting portion (20a), and the pad spring (21) is provided with a friction pad. De (Pa, Pb) the support of the retainer (20) with contact on the outer surface of (20a)
A disc contact device provided with a contact portion (25) for contacting the disc brake device.