JPH0557464U - Disc brake device - Google Patents

Abstract

(57) [Abstract] [Purpose] A pair of support arms arranged on both sides of the brake disc are provided on a fixed bracket, and the brake caliper is provided with a sliding pin parallel to the rotation axis of the brake disc. In a disc brake device, a friction pad, which is slidably supported on the support arm portion through a retainer, is elastically urged toward the support arm portion by a pad spring attached to a brake caliper. Prevents the generation of abnormal noise. [Structure] The retainer 20 has an elastic support portion 20a.
Is provided, and the pad spring 21 has a friction pad P.
An abutting portion 25 is provided which abuts the outer surface of a and abuts the supporting portion 20a of the retainer 20.

Description

[Detailed description of the device]

[0001]

[Industrial application]

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

[0002]

[Prior Art]

 Conventionally, such a disc brake device is already known from, for example, Japanese Utility Model Publication No. 2-143532.

[0003]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional type, by slidingly fitting the sliding pin fixed to the brake caliper to the bracket, the sliding operation of the brake caliper in the direction parallel to the rotation axis of the disc brake is allowed. Has been done. However, when braking by pressing the friction pads on both sides of the brake disc, avoid the brake caliper moving along with the friction pad in the direction of rotation of the brake disc by the minute gap between the sliding pin and the bracket. If the brake caliper is suddenly rotated in the rotation direction without doing so, the sliding pin impacts the bracket and an abnormal noise is generated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a disc brake device that prevents the generation of the abnormal noise during braking.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, the retainer is provided with an elastic supporting portion, and the pad spring contacts the outer surface of the friction pad and the supporting portion of the retainer. A contact is provided.

[0006]

【Example】

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

1 to 3 show an embodiment of the present invention. FIG. 1 is a partially cutaway plan view, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. It is a perspective view.

First, in FIGS. 1 and 2, a fixed bracket B includes a bracket main portion 1 arranged to face one surface of a brake disc D that rotates with a wheel, and a bracket main portion along the circumferential direction of the brake disc D. 1. Support arm portions 3a and 3b which are continuously provided at both ends of the brake disc D and face one surface of the brake disc D, and support portions which face the other surface of the brake disc D at positions corresponding to the support arm portions 3a and 3b, respectively. The arm portions 4a, 4b, the connecting portions 5a, 5b for connecting the supporting arm portions 3a, 4a across the brake disc D and the supporting arm portions 3b, 4b, and the supporting arm portions 4a, 4b are integrally formed. The bracket main portion 1 is provided with a pair of screw holes 7, 7 for fastening to a knuckle (not shown) of an automobile.

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 C and both surfaces of the brake disc D, and in a direction parallel to the rotation axis of the brake disc D. Bracket B is supported so that it can be slid to. That is, the brake caliper C straddles the brake disc D and the first pinching arm portion 8 that faces the back surface of the one friction pad Pa, the second pinching arm portion 9 that contacts the back surface of the other friction pad Pb. The first gripping arm 8 includes a bridge portion 10 that connects the two gripping arm portions 8 and 9, and a piston 12 that slides the back surface of the first gripping arm portion 8 against the hydraulic chamber 11 and the front surface thereof against the friction pad Pa is slidable. It is movably fitted. A boot 13 is provided between the piston 12 and the first sandwich arm portion 8.

Both connecting portions 5 a and 5 b of the bracket B are provided with bottomed sliding holes 14 and 14 which are parallel to the rotation axis of the brake disc D. On the other hand, on the first pinching arm portion 8 of the brake caliper C, sliding pins 15, 15 slidably fitted in the sliding holes 14, 14 are fixed by screw members 16, 16. Boots 17 and 17 are provided between the base ends of the sliding pins 15 and 15 and the first sandwiching arm 8.

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 disc D, respectively. Further, the supporting arm portions 3a, 3b; 4a, 4b of the bracket B are provided with step portions 19a, 19b corresponding to the shoulder portions 18a, 18b, respectively. Thus, the shoulder portions 18a 1 and 18b 2 of the friction pads Pa and Pb are connected to the step portions 19a and 18b via the retainers 20 and 20 made of wear-resistant thin plates which are engaged with the connecting portions 5a and 5b of the bracket B, respectively. 19b respectively supported. Moreover, the retainers 20 and 20 are integrally provided with supporting portions 20a and 20a facing the connecting portions 5a and 5b of the bracket B at intervals along the circumferential direction of the brake disc D so as to extend outward of the brake disc D. The support portions 20a, 20a provided are elastic. Further, in order to suppress the delusion of the friction pads Pa and Pb on the stepped portions 19a and 19b, a pad spring 21 is provided between the back metal 18 of both friction pads Pa and Pb and the bridge portion 10 of the brake caliper C. Is installed.

Referring also to FIG. 3, the bridge portion 10 of the brake caliper C is provided with a rectangular opening portion 22, and the pad spring 21 is engaged with and fixed to the opening portion 22. The fixed portion 23, a pair of arm portions 24, 24 extending from the fixed portion 23 on both sides in the circumferential direction of the brake disc D, and an abutting portion 25 continuously provided at the tips of the arm portions 24, 24. , 25.

The fixing portion 23 is in the form of a rectangular flat plate smaller than the opening portion 22, and has a base plate 27 having a long hole 26 in the central portion, which is long in the longitudinal direction, and an outer edge at both longitudinal ends of the opening portion 22. In order to engage with the engaging claws 28, 28 continuously provided at both ends of the base plate 27, a pair of engaging flanges 29, 29 are provided continuously on both sides of the base plate 27 so as to engage with inner surfaces of both side edges of the opening 22. And engaging claws 30, 30 ... Formed by cutting and raising a part of each of the engaging collars 29, 29 ... To engage with both side edges of the opening 22.

The arm portions 24, 24 extend from the central portion in the longitudinal direction of the base plate 27 in the fixed portion 23 to both sides in the circumferential direction of the brake disc D, and the brakes move toward both sides in the circumferential direction. It is tilted so as to be close to the disk D. Thus, the fixed portion 23 and both arm portions 24, 24 are formed so as to have a mountain shape as a whole.

The abutting portions 25, 25 are connected to the tips of the arm portions 24, 24 so as to be substantially T-shaped, and are in contact with the shoulder portions 18 a, 18 b of the friction pads Pa, Pb. , The retainers 20, 20 are formed in a substantially C-shaped cross section so as to come into contact with the support portions 20a, 20a of the retainers 20, 20.

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 increases the hydraulic pressure in the hydraulic chamber 11 in response to the braking operation, and the friction pad Pa is moved to the brake disc. When pressed to the D side, the reaction force acts on the brake caliper C. The brake caliper C is slidably supported on the bracket B via the sliding pins 15 1 and 15 in the axial direction of the brake disc D, and the brake caliper C is opposite to the pressing direction of the piston 12. By moving in the direction, the other friction pad Pb is pressed against the brake disc D by the second pinching arm portion 9. Therefore, the friction pads Pa and Pb are pressed against the brake disc D from both sides thereof to obtain the braking force.

During such braking, due to the friction between the brake disc D and the friction pads Pa and Pb, the brake caliper C follows the rotation of the brake disc D together with the friction pads Pa and Pb, and the sliding pins 15 and 15. It tries to rotate by a minute gap between the sliding holes 14 and 14. Then, the fixing portion 23 of the pad spring 21 is fixed to the bridge portion 10 of the brake caliper C, and the supporting portions of the retainers 20 and 20 interposed between the friction pads Pa and Pb and the bracket B are fixed. The contact portions 25, 25 of the pad spring 21 are in contact with 20a, 20a. However, since the support portions 20a, 20a face the bracket B with a space in the circumferential direction of the brake disc D and have elasticity, the support portions 20a, 20a are bent by the action of the pad spring 21 and the spring force is increased. Will be demonstrated. Therefore, when the brake caliper C rotates following the rotation of the brake disc D, the support portion 20a on the side that is pressed by the pad spring 21 with the rotation opposes the rotation of the brake caliper C. Since the spring force is exerted, the sudden rotation of the brake caliper C is suppressed. Therefore, it is possible to reliably prevent the sliding pins 15 and 15 from impacting the inner surfaces of the sliding holes 14 and 14 and generating abnormal noise.

[0018]

[Effect of the device]

 As described above, according to the present invention, the retainer is provided with the elastic support portion, and the pad spring is provided with the abutment portion that abuts the outer surface of the friction pad and abuts the retainer support portion. Therefore, the spring force that opposes the rotation of the brake caliper that follows the rotation of the brake disc during braking can be exerted on the support portion, and the sudden rotation of the brake caliper can be suppressed to prevent the generation of abnormal noise. ..

[Brief description of drawings]

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

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 ... Sliding pin 20 ... Retainer 20a ... Support 21 ... Pad spring 25 ... Abutment B ... Bracket C・ ・ ・ Brake caliper D ・ ・ ・ Brake disc Pa, Pb ・ ・ ・ Friction pad

Claims (1)

[Scope of utility model registration request] 1. A pair of support arm portions (3a, 4a; 3b, 4) respectively arranged on both sides of the brake disc (D).
b) is provided on a fixed bracket (B), and a brake caliper (C) straddling the brake disc (D) is mounted on the bracket (B) via a sliding pin (15) parallel to the rotation axis of the brake disc (D). ) Slidably supported on the support arm portions (3a, 4a; 3b, 4b), and friction pads (Pa, Pb) interposed between both surfaces of the brake disc (D) and the brake caliper (C). ) Is supported via a retainer (20), and the brake caliper (C) is elastically urged in the 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) is attached, the retainer (20) is provided with an elastic support 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 brake device, characterized in that a contact portion (25) for contacting with is provided.