JPH0681968B2 - Disc brakes for vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle disc brake, and more particularly to a pad spring for preventing friction of a friction pad in sliding contact with a disc rotor and rattling during idling. It is about.

[Conventional technology]

Push the piston inserted in the cylinder hole of the caliper,
In a vehicle disc brake that presses a pair of friction pads that face each other across the disc rotor against the braking surface of the disc rotor, pad springs that elastically push both friction pads in the non-braking direction and the outer circumferential direction of the disc rotor are provided. As a conventional example of this type, for example, the actual exploitation sho 63-
Some are disclosed in Japanese Patent No. 18634.

In this vehicle disc brake, a hanging piece is provided so as to project on a back plate side portion of a friction pad that is arranged so as to sandwich the disc rotor, and a support arm that straddles the disc rotor is provided on a bracket that is fixed to the vehicle body. A U-shaped slide recess parallel to the disc axis is formed on a surface of the support arm opposite to the back plate side, and the hanging piece is engaged with the slide recess into which the retainer is fitted, so that the back plate side is retained. A back spring side contact surface of the support arm via a pad spring, and a pad spring that elastically springs both friction pads in the non-braking direction and the outer peripheral direction of the disc rotor is integrally formed with the retainer, and the pad spring is suspended. It is mounted between the disk rotor inner peripheral side surface of one piece and the disk rotor outer peripheral side surface of the bracket so that both friction pads are separated from the disk rotor when braking is released, and when both friction pads are running idle. It is prevented with data.

Since this pad spring is formed integrally with the retainer, the plate-shaped spring material is bent, and the locking portion that is locked to the outer peripheral surface of the disc rotor of the bracket,
A curved spring portion and an abutting portion of a hanging piece that inclines toward the disc rotor in the axial direction of the disc rotor are formed on the inner peripheral surface of the disc rotor.

[Problems to be Solved by the Invention]

Therefore, since the pad springs described above are plate-shaped springs, the spring constant is high, and the elastic force that separates both friction pads from the disc rotor when braking is released has the effect that the friction pads have the same force from when the new friction pads were assembled. During the lining use limit, it fluctuates greatly, the stress also increases, and sagging occurs.

Therefore, the present invention can suppress the spring constant, eliminate the fatigue due to stress, prevent the friction pad from rattling, and forcibly pull back the friction pad during non-braking to prevent uneven wear of the lining due to dragging. An object of the present invention is to provide a disc brake for a vehicle having a pad spring that can be prevented.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention has a suspending piece projectingly provided on a back plate side portion of a friction pad opposed to each other with a disc rotor interposed therebetween, and the disc rotor is straddled by a bracket fixed to a vehicle body. A support arm is provided, and a U-shaped slide recess parallel to the disc axis is formed on a surface of the support arm facing the back plate side, and the hanging piece is engaged with the slide recess to support the back plate side part. In a disc brake for a vehicle in which a pad spring for supporting the friction pad on a support arm by abutting the surface opposite to the back plate side, and arranging a pad spring for elastically pushing the friction pad in the non-braking direction and the outer peripheral direction of the disc rotor, The pad spring includes a support arm abutting portion, coil portions extending on both sides of the support arm abutting portion, legs extending from the outer ends of the respective coil portions, and a tip of each leg having a coil portion. It is composed of a locking end bent outward and A pad spring is arranged so as to straddle the disc rotor, the supporting arm abutting portion abuts on the supporting arm, and the legs are moved inward from the outer peripheral side of the disc rotor to twist the coil portion. It is characterized in that the locking ends are respectively locked to the facing surfaces of the two back plates in a deformed state.

Further, a receiving piece that supports the supporting arm facing surface of the supporting arm abutting portion on the supporting arm, a U-shaped retainer portion that fits in the slide recess and supports the hanging piece of the back plate, and a supporting piece. It is preferable to attach a retainer provided with a retainer piece that abuts and supports the side portion of the back plate on the side opposite to the back plate side of the arm. Further, the retainer is provided with a cover portion of the pad spring on the outer peripheral side of the disc rotor. Good to do.

[Action]

According to the above configuration, the friction pad is forcibly urged in the direction away from the braking surface of the disk rotor by the elastic force of the pad spring in the non-braking direction, and also in the outer peripheral direction of the disk rotor. Due to the force, the hanging piece of the back plate comes into contact with the disk recess outer peripheral side surface of the slide recess or the retainer part fitted to the slide recess, thereby preventing rattling during idle running.

The braking torque in the disc circumferential direction generated on the friction pad during braking is supported by the contact between the back plate side portion and the surface of the support arm facing the back plate side portion, and the braking torque generated in the radial direction of the disc rotor is the pad spring. Of the disk rotor is supported by the abutment of the hanging piece and the slide concave portion or the retainer portion which are urged by the elastic force in the outer peripheral direction of the disk rotor.

Further, if the retainer is provided with a cover portion for the pad spring, it is possible to prevent stones, sand, and the like from entering from the outside.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

The disc brake 1 is a bracket 2 fixed to the vehicle body.
Support arms 2a, 2a are arranged so as to straddle the outer circumference of the disk rotor 3 that rotates integrally with the wheels, and between the support arms 2a, 2a,
A caliper 4 is provided which is slidably attached to the mounting arms 4a on both sides and is inserted into the insertion hole 2b of the support arm 2a so as to be guided so as to be movable in the disc axial direction.

The caliper 4 includes an operating portion 4b having a cylinder hole 7,
Since the reaction portion 4d including the reaction force claw 4c is connected by the bridge portion 4e that straddles the outer circumference of the disc rotor 3, the piston 8 is inserted in the cylinder hole 7 and both sides of the disc rotor 3 are A pair of friction pads 9, 9 are arranged so as to face each other.

Each friction pad 9 has a lining 10 slidably contacting the braking surface 3a of the disc rotor 3 and a back plate to which the lining 10 is fixed.
The back plate 11 is provided with a hanging piece 11a projecting outward and a guide piece 11b projecting to the vehicle body mounting side of the bracket 2 on both sides of the back plate 11, respectively.
The two suspension pieces 11a, 11a are engaged with the support arms 2a of the bracket 2 to be suspended and supported.

A retainer 12 is attached to each supporting arm 2a, and a pad spring 13 is supported by the supporting arm 2a via the retainer 12. A U-shaped slide recess 2d is formed on the back plate side facing surface 2c of the support arm 2a, and a guide recess 2e is formed on the outer peripheral side surface of the disc rotor of the bracket 2 continuous with the slide recess 2d in parallel with the disc axis. ing.

As shown in FIGS. 6 and 7, the retainer 12 has a locking piece 12b at the center of the lower portion of a base portion 12a disposed on the back plate side facing surface 2c on the outer peripheral side of the disk rotor. A pair of legs 12c and 12c are provided on both sides of the base 12a.
An arcuate covering portion 12d is extended on the upper part of the.

Each of the legs 12c includes a U-shaped retainer portion 12e and an L-shaped retainer piece 12f connected to the retainer portion 12e.
A receiving piece 12g is vertically provided at the center of the tip of 2d, and notches 12h and 12h are formed on both sides between the base portion 12a and the covering portion 12d. Further, locking claws 12i are provided on the outer sides of the retainer portion 12e and the retainer piece 12f, respectively.

As shown in FIG. 8, the pad spring 13 includes a U-shaped support arm contact portion 13a, a pair of coil portions 13b and 13b extending on both sides of the support arm contact portion 13a, and each coil portion. It is composed of legs 13c and 13c extending from the outer ends of 13b and 13b, and locking end portions 13d and 13d in which the tips of the legs 13c and 13c are formed by bending the coil portions 13b outward. In this pad spring 13, the support arm contact portion 13a and the coil portions 13b and 13b are arranged in the cover portion 12d of the retainer 12, and the support arm facing surface of the support arm contact portion 13a is brought into contact with the piece 12g. While being contacted and supported, each leg 13c is inserted into each notch 12h and temporarily fixed to the retainer 12, and each leg 13c is biased by the twisting deformation of each coil portion 13b. , The elastic force A shown in FIG. 1 is applied within the range regulated by the notch 12h.

In the retainer 12 to which the pad spring 13 is temporarily fixed, the retaining piece 12b is retained in the rotor groove 2f of the support arm 2a, and the retainer portion 1
Fit 2e into slide recess 2d and retainer piece 12f.
Is disposed on the bottom surface of the back plate side facing surface 2c and the guide recess 2e on the inner peripheral side of the disk rotor, and the locking claws 12i are hooked to be attached to the respective support arms 2a. It is supported by abutting on the receiving surface 2g of the support arm 2a. In addition, by attaching this retainer 12 to each support arm 2a, the pad spring
Reference numeral 13 is arranged so as to straddle the disk rotor 3.

In each of the friction pads 9, the hanging piece 11a of the back plate 11 is engaged with the retainer portion 12e of the retainer 12, and the guide piece 11b is engaged with the guide recess 2e so that the side portion of the back plate is a disc of the support arm 2a. The back plate side facing surface 2c on the inner peripheral side of the rotor is suspended and supported by the bracket 2 by abutting it via the retainer piece 12f, and each leg 13c, 13c of the pad spring 13 is connected to the disc rotor 3. With the coil parts 13b, 13b twisted and deformed by moving from the outer peripheral side to the inner peripheral direction, the locking end 13
Locking holes 11c, in which d and 13d are formed on the opposite surfaces of both back plates 11 and 11, respectively.
Lock to 11c respectively.

By attaching the retainer 12 and the pad spring 13, the elastic force A (see FIG. 1) generated by the urging force due to the torsional deformation of the coil portion 13b acts on the friction pad 9 to suspend it. The piece 11a is urged in the direction of arrow B to abut the disk rotor outer peripheral surface of the retainer portion 12e,
Due to the reduction of the coil portion 13b by the braking operation, the elastic force C (see FIG. 3) forcibly withdrawing from the braking surface 3a of the disk rotor 3 in the non-braking direction acts, and the friction pad 9 has both elastic forces. At A and C, there is rattling when the disk rotor 3 runs idle,
Uneven wear due to dragging is prevented.

The elastic force C is set to be smaller than the seal resistance of the piston 8 even when the lining 10 is fully worn, and the gap between the braking surface 3a of the disc rotor 3 and the lining 10 is always constant. I am trying to keep it.

Therefore, in the pad spring 13, the spring constant can be suppressed to a low value by the above-mentioned configuration, and the elastic force for separating the friction pads 9 and 9 from the disk rotor 3 at the time of releasing the braking and the elastic force in the disk rotor outer peripheral direction are From the time of assembling a new friction pad to the use limit of the lining of this friction pad, it does not fluctuate significantly, the stress also becomes small, and fatigue due to stress can be eliminated.

The braking torque in the disc circumferential direction generated on the friction pad 9 during braking is retained by the retainer 12 provided on the guide piece 11b of the back plate 11 and the back plate side facing surface 2c of the support arm 2a on the inner circumferential side of the disc rotor. The braking torque that is supported by contact with the piece 12f and that is generated in the radial direction of the disk rotor 3 is supported by the hanging piece 11a and the retainer portion 12e that contact with the elastic force A.

Further, as an effect of the present embodiment, by interposing the retainer 12, the pad spring 13 is temporarily fixed and the supporting arm 2a
Can be securely mounted, and even if the support arm 2a is used as it is, the support arm contact portion 13 of the pad spring 13
Since a is supported by the receiving surface 2g of the support arm 2a via the receiving piece 12g, it does not hinder the expansion and contraction action, and the receiving surface 2g
Does not even damage.

In addition, since the cover portion 12d covers the pad spring 13, it is possible to prevent the intrusion of stones, sand, or the like from the outside to achieve a smooth operation.

FIG. 9 is another embodiment showing a modified example of the retainer. In the retainer 20 of this embodiment, both sides between the base portion 12a and the cover portion 12d are connected by ribs 12j, and a rectangular through hole is formed inside thereof. 12k and 12k are formed, and other parts such as the retainer part 12e are configured in the same manner as in the above embodiment.

Then, the pad springs 13 are inserted into the through holes 12k of the legs 13c as shown in the figure, and are securely temporarily fixed to the retainer 12 without falling off, and this temporary fixing can improve workability in a new assembly process. In addition, since it is not separated during maintenance such as pad replacement, it will not be lost or forgotten to be assembled.

In both embodiments, the retainer may be omitted and the pad spring may be directly attached.

〔The invention's effect〕

As described above, according to the present invention, a hanging piece is provided so as to project from a back plate side portion of a friction pad that is arranged to face each other with the disc rotor interposed therebetween, and a bracket fixed to the vehicle body is provided with a support arm that straddles the disc rotor. , A U-shaped slide recess parallel to the disc axis is formed on a surface of the support arm facing the back plate side, and the hanging piece is engaged with the slide recess so that the back plate side is located on the back plate side of the support arm. Support the friction pad on the support arm by abutting on the part facing surface,
A pad spring that elastically repels the friction pad in the non-braking direction and the outer peripheral direction of the disc rotor is provided with a support arm contact portion, coil portions extending on both sides of the support arm contact portion, and outer ends of the coil portions. Each of which extends from the coil and a locking end formed by bending the tip of each leg to the outside of the coil, and the pad spring is disposed across the disc rotor to support the support arm contact portion. Abutting against the support arm and moving the legs inward from the outer peripheral side of the disc rotor to twist and deform the coil portion so that the locking end portions face the back plates. Since the friction pads prevent uneven wear due to the drag of the disk rotor due to both elastic forces and rattling during idling, the pad springs have the structure described above. The constant can be kept low, and both friction pads are The elastic force to separate from the rotor and the elastic force in the outer peripheral direction of the disk rotor do not change greatly from the time of assembling a new friction pad to the use limit of the lining of this friction pad, and the stress also decreases. It is possible to eliminate fatigue due to stress.

Further, the braking torque in the disc circumferential direction generated on the friction pad during braking is also supported by the contact between the guide piece of the back plate and the surface of the support arm facing the back plate side, and the braking torque generated in the radial direction of the disc rotor is also Since it is supported by the contact between the hanging piece and the guide recess, a reliable braking action can be expected.

Further, between the pad spring and the bracket, a receiving piece that supports the supporting arm facing surface of the supporting arm abutting portion and a U-shaped retainer that fits in the slide recess and supports the hanging piece of the back plate. If a retainer is provided with a retainer piece and a retainer piece that abuts and supports the side portion of the back plate on the side opposite to the back plate side of the support arm, the pad spring can be securely attached and the bracket can be cast. Can be used as is.

Further, if the retainer is provided with a cover portion for the pad spring, it is possible to prevent stones, sand, and the like from entering from the outside.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention, FIG. 1 is an enlarged sectional view of an essential part, FIG. 2 is a front view of a disc brake,
3 is a plan view of the same, FIG. 4 is a half sectional rear view, FIG. 5 is a VV sectional view of FIG. 2, FIG. 6 is a perspective view of the retainer seen from the front direction, and FIG. 7 is the same. FIG. 8 is a perspective view of the pad spring as seen from the rear side, and FIG. 9 is a perspective view of a pad spring and a retainer showing another embodiment. 1 ... Disc brake, 2 ... Bracket, 2a ... Support arm, 2c ... Back plate side facing surface, 2d ... Sliding recess, 2e
…… Guide recess, 3 …… Disk rotor, 3a …… Brake surface, 4 …… Caliper, 9 …… Frictional pad, 10 …… Lining, 11 …… Back plate, 11a …… Hanging piece, 11b …… Guide One piece, 11c …… Locking hole, 12 …… Retainer, 12a …… Base part, 12b …… Locking piece, 12c …… Leg part, 12d …… Cover part, 12e
...... Retainer part, 12f ...... Retainer piece, 12g ...... Receiving piece,
12h …… notch, 12i …… locking claw, 12j …… rib, 12k ……
Through hole, 13 ... Pad spring, 13a ... Support arm contact part, 13b ... Coil part, 13c ... Leg, 13d ... Locking end part

Claims (3)

[Claims] 1. A suspension piece is provided on a back plate side portion of a friction pad opposed to each other with a disc rotor interposed therebetween, and a bracket fixed to a vehicle body is provided with a support arm straddling the disc rotor. A U-shaped slide recess parallel to the disk axis is formed on the surface of the arm facing the back plate side, and the hanging piece is engaged with the slide recess to support the back plate side. In a vehicle disc brake in which the friction pad is supported by a supporting arm by abutting against it and the friction pad is elastically urged in the non-braking direction and the outer peripheral direction of the disc rotor, the pad spring is supported by the supporting arm. A contact part,
Coil portions extending on both sides of the support arm abutting portion, legs extending from the outer ends of the coil portions, and locking ends formed by bending the tips of the legs outward of the coil portions. The pad spring is disposed across the disc rotor, the supporting arm abutting portion is abutted on the supporting arm, and the legs are moved inward from the outer peripheral side of the disc rotor. A disc brake for a vehicle, wherein the locking end portions are respectively locked to the opposite surfaces of the two back plates while the coil portion is twisted and deformed. 2. A support piece for supporting the support arm facing surface of the support arm abutting portion on the support arm, and a U-shaped retainer portion fitted in the slide recess to support the hanging piece of the back plate. The disc brake for a vehicle according to claim 1, further comprising: a retainer having a retainer piece that abuts and supports a side portion of the back plate on a surface of the support arm facing the back plate side. 3. The disc brake for a vehicle according to claim 2, wherein the retainer is formed with a cover portion of the pad spring on the outer peripheral side of the disc rotor.