JP2563947Y2 - Pad springs for vehicle disc brakes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake used for a running vehicle such as an automobile or a motorcycle, and more particularly to a pad spring provided on a caliper for pressing a friction pad against a disc rotor with a piston and a reaction force claw.

[0002]

2. Description of the Related Art In a disk brake in which friction pads arranged on both sides of a disk rotor are pressed against the disk rotor by a caliper piston and a reaction force claw, a pad is provided between the friction pad and a bridge portion of the caliper. Some springs are contracted. The pad spring urges both friction pads integrally in the direction of the center of the disk to prevent rattling due to running vibration and to prevent the disk from rising in the outer peripheral direction during braking (for example,
See Japanese Utility Model Unexamined Publication No. 2-150436.

[0003]

Incidentally, friction pads in recent years have been increased in size with the speeding up of vehicles, and instead of asbestos, a sintered metal that is heavier and harder than asbestos is used for the lining. When the friction pad becomes heavy and large, the conventional pad spring, in which the set load on the friction pad is set to match the material of asbestos, cannot sufficiently press the friction pad. May swing like dancing.

In particular, when the reaction portion of the caliper provided with the reaction force claw is made of a material softer than the back plate of the friction pad, for example, a steel plate back plate, the reaction force claw is made of cast iron or aluminum alloy. In some cases, the reaction claw is hit against the back plate by the dance of the friction pad, and the reaction claw gradually warps in a direction opposite to the disk rotor, and the replacement may be required.

As a countermeasure, a means for increasing the set load of the pad spring in accordance with the friction pad of the reaction portion can be considered. In this case, the pad spring slides in the disk axial direction with respect to the pad spring fixed to the caliper. Unnecessary set load is applied to the friction pad on the action section side, which may hinder smooth sliding.

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation, and an object of the present invention is to make the friction pad of the reaction unit side dance without damaging the sliding property of the friction pad of the operation unit side. An object of the present invention is to provide a pad spring for a disk brake for a vehicle, which suppresses deformation of a reaction force claw while suppressing the deformation.

[0007]

SUMMARY OF THE INVENTION In accordance with the above-mentioned object, the present invention provides a pair of friction members sandwiching a disk rotor between a working portion and a reaction portion of a caliper provided on both sides of the disk rotor. A pad is arranged, a pad spring for urging these friction pads toward the center of the disc is contracted between the friction pad and the bridge portion of the caliper, and a reaction force claw provided on the reaction portion is provided. In a vehicle disk brake formed of a material softer than a back plate of a friction pad on a reaction portion side, the pad spring is formed by using a common pad spring for resiliently pressing both of the friction pads and a friction pad on the reaction portion side. A resilient pad spring on the reaction portion side is used, and these pad springs are superimposed on each other to act on the friction pad on the reaction portion side. The set load of the disk center direction, characterized in that set higher than the set load of the disk center direction acting on the friction pad of the acting portion side.

[0008]

In the above construction, each friction pad is urged toward the center of the disk by the two pad springs with different set loads. The set load is set such that the friction pad does not dance due to engine vibration on the reaction portion side, and is set such that the friction pad can slide smoothly in the disk axial direction on the action portion side.

[0009]

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

The disk brake 1 includes a disk rotor 2 that rotates integrally with a wheel (not shown), a bracket 3 fixed to the vehicle body at one side of the disk rotor 2, and two sliding pins on the bracket 3. It comprises a caliper 6 movably supported in the axial direction of the disc via the discs 4 and 5, and a pair of friction pads 7, 7 arranged on both sides of the disc rotor 2 to face each other.

The caliper 6 is composed of two caliper halves 6a and 6b divided on both sides of the disk rotor 2.
One caliper half 6a is integrally formed with a working portion 6c and a bridge portion 6d, and the other caliper half 6b is entirely a reaction portion. 6e.

In the working portion 6c, pistons 10a, 10b, and 10c are accommodated in three large and small cylinder holes 9a, 9b, and 9c, respectively, which are open on the disk rotor 2 side. A plate-like reaction claw 6f is provided. The three cylinder holes 9a to 9c are divided into two systems: a hydraulic path in which outer cylinder holes 9a and 9b are connected by a liquid passage 9d, and a hydraulic path using only the central cylinder hole 9c. For this reason, the working portion 6e has an inlet port 11 for introducing the pressurized hydraulic fluid into the cylinder holes 9a to 9c and a blender hole 12 for discharging the air in the cylinder holes 9a to 9c to the outside. 2
It is provided one after another.

The friction pad 7 includes a lining 13 which is in sliding contact with the side surface of the disk rotor 2, and a back plate 14 which is held by the bracket 3 and the caliper 6. The back plate 14 has a hanging piece 14a on the disk revolving side, a torque transmitting arm 14b on the disk revolving side, and two engaging projections 14c, 14c on the outer peripheral surface. The working portion 6c is attached to the hanging piece 14a
The hanger pin 15 which is hung over the reaction part 6e is inserted into the torque transmitting arm 14b on the disk outlet side, and is inserted into the torque receiving recess 3b of the caliper support arm 3a extending from the bracket 3 to the outer periphery of the disk rotor 2. It is loosely fitted and movably suspended in the disk axis direction.

The friction pad 7 on the working portion side has a cylinder hole 9
Piston 1 advancing with pressurized liquid supplied to the bottom of a-9c
The pushing force of 0a to 10b pushes the disc rotor 2 to one side surface, and the friction pad 7 on the reaction portion pushes the reaction force claw 6f of the caliper 6 which moves in the direction of the action portion 6c by this reaction force. , The disk rotor 2 is pressed against the other side surface to brake the rotating disk rotor 2.

The two friction pads 7, 7 are
d, two pad springs 16, 1
7 are urged toward the center of the disk. One of the pad springs 16 is used for both of the friction pads 7, 7 while the other pad spring 17 is used in common.
Is dedicated to the reaction portion that repels only the friction pad 7 on the reaction portion side.

The common pad spring 16 includes a caliper mounting portion 16a formed in a substantially U-shape, and the mounting portion 1a.
6a, two pairs of spring pieces 16b extending inclining in the disk inward and outward directions with respect to each other;
Pad pressing portion 16 extending in the disk axis direction from the tip of
c, 16c, 16d, and 16d. Further, the pad spring 17 on the reaction portion side is connected to the central strip 17a.
And a pair of spring pieces 17b, 17 extending from one end of the strip 17a in an inclined manner in the disc reciprocation and retraction directions.
b and pad pressing portions 17c, 17c extending in the disk axis direction from the tip of each spring 17b. Spring piece 17b of reaction part side pad spring 17
Is slightly shorter than the spring piece 16b of the common pad spring 16.

The pad springs 16 and 17 overlap the strip 17a of the reaction portion side pad spring 17 in the direction intersecting the caliper mounting portion 16a of the common pad spring 16 and the spring piece 16b.
The spring piece 17b and the pad pressing portion 17c are overlapped with the spring piece 16b of the pad spring 16, the pad spring 17 on the reaction portion side is overlapped on the bridge portion 6d side of the common pad spring 16, and the common pad spring 16 Of the pad spring 16 is engaged with the engaging projection 14c of the back plate 14 on the working portion side, and the pad pressing portion 16c of the pad spring 16 is also held by the projection 6g of the bridge portion 6d. 16d, 16d are respectively attached to the engaging projections 14c of the back plate 14 on the reaction portion side by abutting each other (see FIGS. 1, 3, and 4). The pad pressing portion 17c of the reaction portion side pad spring 17 is superimposed on the spring piece 16b of the common pad spring 16, and the resilience of the pad spring 17 is reduced by the spring piece 1
The force is transmitted to the friction pad 7 on the side of the reaction portion via 6b (FIGS. 1 and 4).

Further, both of the six pad pressing portions 16c, 1
6c, 16d, 16d, 17c, 17c, the pad pressing portions 16d, 16d,
17c, 17c are both pad springs 1 during braking.
6 and 17, and the friction pad 7 on the reaction portion side move integrally, so that the length is small enough to cover the thickness of the back plate 14, whereas the pad pressing portions 16c, 16c on the action portion side.
Is that the friction pad 7 on the working portion side is a pad spring 16,
17 is formed in a direction longer than the pad pressing portions 16d and 17c on the reaction portion side, so that the back plate 14 is formed even when the lining 13 on the action portion side is fully worn.
Is not disengaged.

The set load acting on the friction pads 7, 7 from the pad springs 16, 17 toward the center of the disk is high on the reaction portion side where the pad pressing portions 16d, 17c are overlapped, and the operating portion of only the pad pressing portion 16c is applied. On the side, it is lower than this. The set load is set so that the friction pad 7 on the reaction portion does not dance due to engine vibration during non-braking such as during normal running, and that the friction pad 7 on the action portion side dances due to engine vibration on the action portion. The setting is made so as not to impair the slidability of the friction pad 7 on the action section side during braking while minimizing as much as possible.

In the above setting, the friction pad 7 on the action section side
Is smaller than the reaction portion side, and there is a possibility that a slight vibration due to engine vibration may remain on the friction pad 7. Therefore, on the action portion side, the set load with the pistons 10 a to 10 c in the cylinder holes 9 a to 9 c is reduced. By increasing the tightening margin of the square seal 18 interposed therebetween, even if the friction pad 7 on the working portion side may slightly swing,
Problems such as knockback for a to c are prevented from occurring.

As described above, this embodiment replaces the conventionally integrated pad spring with two pad springs 1.
6 and 17, and the common pad spring 16 is overlapped with the pad spring 17 on the reaction portion side to apply a set load in the disk center direction on the friction pad 7 on the reaction portion side to the friction pad 7 on the operation portion side. By setting it higher than that, even if the entire shape of the friction pads 7, 7 is large and heavy, dancing of the friction pads 7 due to engine vibration is effectively suppressed on the reaction portion side. Thus, even if the reaction claw 6f is formed of a material softer than the back plate 14 of the friction pad 7, the deformation of the reaction claw 6f warping by hitting the back plate 14 is eliminated, and the durability of the caliper 6 is improved. Will be kept.

On the other hand, since the set load is kept low on the working portion side, the pad spring 16 does not press the friction pad 7 on the working portion more than necessary, so that the sliding property of the friction pad 7 on the working portion side is reduced. Can be held smoothly.

In this embodiment, since the pad spring 17 on the reaction portion side is mounted between the common pad spring 16 and the bridge portion 6d, the attachment is excellent, and the pad spring 17 on the reaction portion side is excellent. Since the caliper mounting portion is omitted from 17, a simple shape is sufficient.

The present invention is based on the premise that the back plate of the friction pad on the reaction portion side is made of a harder material than the reaction force claw.
The caliper is applicable whether it is a split type as in the embodiment or an integral type. Further, each pad spring may have a shape other than the embodiment. For example, the caliper mounting portion may be provided on the pad spring on the reaction portion side, and the common pad spring may be sandwiched between the pad spring and the bridge portion. Further, in the embodiment, the engagement protrusion provided on the back plate of the friction pad may be omitted.

[0025]

According to the present invention, a common pad spring acting on both the friction pads on the working portion side and the reaction portion side and the bridge portion of the caliper, and a friction pad on the reaction portion side are provided. By setting the reaction part side pad spring acting only on the reaction part side in a superposed manner, the set load of the reaction part side friction pad toward the center of the disc is set higher than the set load of the reaction part side friction pad. Even if the overall shape is large and heavy, on the reaction portion side, the dance of the friction pad due to engine vibration is effectively suppressed. Thereby, even if the reaction force nail is formed of a material softer than the back plate of the friction pad, deformation such that the reaction force nail is warped by hitting the back plate is eliminated, and the durability of the caliper can be kept high. In addition, since the set load of the pad spring is suppressed to a low value on the working portion side, the spring does not press the friction pad on the working portion more than necessary, so that the sliding property of the friction pad can be kept smooth.

[Brief description of the drawings]

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

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a divided perspective view of a pad spring.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk brake, 2 ... Disk rotor, 6 ... Caliper, 6a, 6b ... Caliper half which comprises the caliper 6, 6c ... Working part, 6d ... Bridge part, 6e ... Reaction part, 6f ... Reaction force claw, 6g ... Pad springs 16, 17
Ridges on which are mounted, 9a, 9b, 9c ... cylinder holes,
10a, 10b, 10c: piston, 13: lining, 14: back plate, 15: hanger pin, 16: pad spring for common use, 17: pad spring on the reaction portion side, 16a: caliper mounting portion, 16b, 17b: spring piece , 16c, 16d, 17c ... pad pressing portion, 1
7a: strip, 18: square seal

Claims (1)

(57) [Scope of request for utility model registration] A pair of friction pads are arranged between a working portion and a reaction portion of a caliper provided opposite to both sides of a disk rotor with a disk rotor interposed therebetween, and a bridge between the friction pad and the caliper is provided. A pad spring that urges these friction pads toward the center of the disc is contracted between the first and second portions, and a reaction claw provided on the reaction portion is made softer than the back plate of the friction pad on the reaction portion side. In a vehicle disk brake formed of a material, the pad spring has two parts: a common pad spring that repels both of the friction pads, and a pad spring on a reaction part that repels only the friction pad on the reaction part. In addition, these pad springs are superimposed on each other, and the set load acting on the friction pad on the reaction portion side toward the rotor center is reduced by the friction on the action portion side. A pad spring for a disc brake for a vehicle, wherein the pad spring is set higher than a set load acting on the pad toward a center of the disc.