JPH0545266U - Friction pad return structure for vehicle disc brakes - Google Patents

Abstract

(57) [Summary] [Purpose] With a simple structure, the contact noise between the friction pad and the caliper body and the drag of the friction pad are prevented. [Structure] An elastic wire is folded back in a loop shape at the center to form a hairpin-shaped elastic member 8 having a pair of elastic pieces 8a and 8b. A curved portion 8c is formed at a substantially central portion of the elastic piece 8a on the disc feeding side, and the elastic member 8 is inserted in the disc axial direction of the bridge portion 3c so that the curved portion 8c faces the disc feeding direction. A curved portion 8c is formed on the back plate 6a of the friction pad 6.
The contact portion 6d for receiving is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a friction pad returning structure for a vehicle disc brake that always holds friction pads arranged on both sides of a disc rotor at a predetermined position to prevent dragging and rattling.

[0002]

[Prior Art]

 The non-braking friction pad that has released the pressure on the disc rotor is generally returned by auction with the disc rotor, so the friction pad is not sufficiently separated from the disc rotor and the lining of the friction pad is dragged to the disc rotor. As a result, dragging noise and uneven wear of the lining were caused.

Further, during braking, the friction pad may be dragged toward the disc squeeze side and come into contact with the caliper body to generate a contact sound.

Therefore, for example, as disclosed in Japanese Utility Model Laid-Open No. 55-179240, a spring formed by bending a wire into a substantially V shape is interposed between a caliper racket and a pair of friction pads. There is a system in which both friction pads are separated from the disc rotor by the elastic force when the brake is not applied.

[0005]

[Problems to be solved by the device]

 However, with the above-mentioned one, although it is possible to prevent the friction pad from being dragged during non-braking, it has not been possible to prevent the friction pad from coming into contact with the caliper body and producing a contact noise during braking.

Therefore, the present invention enables the friction pad to be always held at a predetermined position with a simple structure, and can prevent the contact sound between the friction pad and the caliper body and the drag of the friction pad. It is an object of the present invention to provide a friction pad returning structure for a vehicle disc brake.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, a friction pad returning structure for a vehicle disc brake according to the present invention is a vehicle disc brake having a caliper body that straddles a disc rotor and friction pads arranged on both sides of the disc rotor with a bridge portion. A curved portion is formed at a substantially central portion of at least one elastic member, and the elastic member is arranged in the disc axial direction of the bridge portion so that the curved portion faces the disk feeding direction, and It is characterized in that an abutting portion is formed on the back plate side of the friction pad, the abutting portion being in contact with the side surface of the curved portion on the disc feeding side.

[0008]

[Action]

 As described above, since the friction pad is always pressed against the disc squeezing side by the curved portion of the elastic member, no contact noise is generated between the friction pad and the caliper body during braking.

Further, the bending portion becomes linear as the friction pad is pressed during braking, and when the damping is released, the friction pad separates from the disc rotor due to the restoring force of the bending portion.

[0010]

【Example】

 An embodiment in which the present invention is applied to a vehicle disc brake in which a friction pad is suspended by a hanger pin will be described with reference to the drawings.

In the disc brake 1, body halves 3a and 3b forming a caliper body 3 are arranged opposite to each other on both sides of a disc rotor 2 which rotates integrally with wheels in a direction of an arrow A. 3b is a piston-opposing type in which pistons 4a and 4b are liquid-tightly inserted into large and small cylinder holes 3d and 3e formed by opening the disc rotor 2 side. Are connected by four bolts 5 which are inserted into the bridge portion 3c, and one half body 3a is attached to the vehicle body by bolts.

In the bridge portion 3c, a ceiling opening portion 3f is formed at a position above a pair of friction pads 6 and 6 which are opposed to each other with the disc rotor 2 interposed therebetween.

Each friction pad 6 is composed of a back plate 6a and a lining 6b, and the hanger pin 7 which is bridged over the bridge portion 3c across the ceiling opening 3f can be inserted into the insertion hole 6c of the back plate 6a. It is suspended by the disk so that it can move in the axial direction. Two elastic members 8 and 8 on both sides of the hanger pin 7 are bridged over the bridge portion 3c across the ceiling opening 3f, and the back plate 6a has contact portions 6d and 6d of the elastic members 8 respectively. It is projected.

The elastic members 8 and 8 are hairpin-shaped, in which a pair of elastic pieces 8a and 8b are formed by folding an elastic wire in a loop shape at the center, and the elastic piece 8a on the disc feeding side is substantially at the center. A curved portion 8c that is curved in the disc feeding direction is formed in the portion. The bridge portion 3c of the caliper body 3 is provided with insertion holes 3g and 3g respectively. After inserting the elastic pieces 8a and 8b into the insertion holes 3g, respectively, the tip ends of the elastic pieces 8a and 8b are outwardly moved, respectively. The stoppers 8d and 8d are formed by being bent.

Further, the elastic pieces 8a and 8b contact the insides of the contact portions 6d and 6d, respectively, and also contact the upper surface 6e of the back plate of the friction pad 6, respectively. It is biased toward the inner circumference to prevent it from rising.

In the disc brake 1 thus formed, the elastic piece 8a is formed with the curved portion 8c which is curved in the disc extension direction, so that the friction pads 6 and 6 are always on the disc extension side. Even when the friction pads 6 and 6 are dragged to the disc squeezing side during braking, the friction pads 6 and 6 and the caliper body 3 do not come into contact with each other and generate a contact noise. it can.

Further, when the friction pads 6, 6 are pressed toward the disc rotor 2 side during braking, the elastic piece 8a becomes linear, and when the braking is released, the restoring force of the elastic piece 8a causes By separating the friction pads 6 and 6 from the disc rotor 2, it is possible to prevent the friction pads 6 and 6 from being dragged and to prevent uneven wear of the linings 6b and 6b.

Further, since the elastic pieces 8a and 8b of the elastic member 8 are in contact with the upper surface 6e of the back plate of the friction pad 6, it is possible to prevent the friction pads 6 and 6 from rising and rattling during traveling. it can.

The present invention is not limited to the hanger pin suspension type as in the above embodiment, but can be applied to a disc brake of a type in which a bracket supports the ears on both sides of the friction pad.

Further, the shape of the spring is not limited to the one formed by folding the wire rod into a hairpin shape, and may be one formed of a leaf spring having a curved portion.

[0021]

[Effect of the device]

 As described above, according to the present invention, at least one elastic member is formed with a curved portion substantially in the center thereof, and the elastic portion is arranged in the disc axial direction of the bridge portion so that the curved portion faces the disc winding direction. The friction pad is always pressed against the disc feeding side because the contact portion is formed on the back plate side of the friction pad that comes into contact with the side face of the curved portion on the disc feeding side. Even if the friction pad is dragged to the disc squeezing side during braking, the contact noise generated when the friction pad and the caliper body abut can be prevented.

Further, due to the function of the curved portion, the friction pad can be pulled back from the disc rotor during non-braking, and uneven wear of the friction pad can be prevented.

[Brief description of drawings]

FIG. 1 is a partially sectional plan view of a disc brake showing an embodiment of the present invention.

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

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a, 3b ... Body half body, 3c ... Bridge part, 4a, 4b ... Piston, 6 ... Friction pad, 6a ... Back plate, 6b ... Lining, 6d ... Contact part, 7 ... Hanger pin, 8 ... Elastic member, 8a, 8b ... Elastic piece, 8c ... Curved part, 8d ... Stopper

Claims (1)

[Scope of utility model registration request] 1. A vehicle disc brake including a caliper body that straddles a disc rotor and friction pads arranged on opposite sides of the disc rotor at a bridge portion, wherein a curved portion is formed at a substantially central portion of at least one elastic member. Then, the elastic member is disposed in the disc axial direction of the bridge so that the curved portion faces in the disc spilling direction, and the disc spill of the curved portion is provided on the bridge side of the back plate of the friction pad. A friction pad returning structure for a vehicle disc brake, wherein an abutting portion that abuts a side surface of the side is formed.