JPH08145090A - Pad spring for disc brake - Google Patents

Abstract

PURPOSE: To provide a disc brake pad spring which does not cause cost increase and can be easily detached. CONSTITUTION: A locking arm 12 is severally provided at both the ends of a covering part 11 to shut the opening part 2 of a caliper 1, and a locking piece 12a at the tip of the arm 12 is locked in the bottom of a disc groove 3, and the back plate 5a of the pad 5 is pressed against the central side of the disc by the inside of the covering part 11. Thus, screwing being disadvantageous in view of a cost becomes unnecessary, and the attaching performance of the pad to the caliper can be also improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called open-top type disc brake in which a pair of opposed friction pads are suspended by pad pins for support, and a pad spring used as a mudguard cover and a rattle noise preventer for pad vibration. Regarding

[0002]

2. Description of the Related Art For example, in a piston-opposed disc brake in which a pair of opposed friction pads are individually pressed by a piston to make sliding contact with the disc, the friction pads are arranged in the disc radial direction on the bridge portion of the caliper that straddles the disc. An opening for taking in and out is provided, and a pad pin laid across the opening is passed through a pin hole of a pad back plate to support a pair of friction pads slidably in the disc axial direction.

In this type of disc brake, muddy water easily enters between the caliper opening and the friction surface, so that the opening is covered with a mudguard cover.

If the pad pin is simply loosely fitted, the friction pad vibrates while the vehicle is running and hits a caliper or a pad pin to generate a hammering sound (rattle noise). Therefore, the mudguard cover is used to prevent rattle noise. The cover, which is also used as a spring force, presses the edge of the pad back plate on the outer peripheral side of the disk toward the center of the disk to stop the friction pad from rattling.

The mudguard cover that also serves as the rattle noise preventive tool is called a pad spring. Since a pressing reaction force is applied to this pad spring, the method disclosed in Japanese Patent Laid-Open No.
Screwed as shown in Japanese Patent No. 188730,
As shown in Japanese Utility Model Laid-Open No. 6-32772, guide grooves for closing the inlet are provided facing each other on the inner surface of the opening portion of the caliper by the reaction side piece of the split caliper, and both ends are inserted into the groove to form the caliper. It is installed.

[0006]

The structure for screwing the pad spring requires a set screw and a screw hole, which causes an increase in cost due to an increase in the number of parts and machining. Further, since the pad replacement is performed by removing the pad spring screwed, the pad replacement work becomes troublesome.

According to the technique disclosed in Japanese Utility Model Laid-Open No. 6-32772, it is necessary to remove the reaction side piece of the caliper in order to remove the pad spring, and the pad replacement is allowed only by removing the pad pin. The benefits of braking are lost.

There is also a pad spring in which an elastic arm is engaged with the pad pin to attach it, but this spring does not exert a restraining force on the pad pin, resulting in insufficient prevention of rattle noise.

In order to eliminate these problems, it is an object of the present invention to provide a pad spring which can be easily attached and detached without using a set screw in the opening of the caliper.

[0010]

In order to solve the above problems, the present invention has a cover portion for covering the opening of the caliper, and the cover portion covers the edge of the disk outer peripheral portion of the pad back plate. Locking arms that are inserted into the opening are provided at both ends of the pad spring that presses toward the center side, and locking pieces at the tips of the locking arms that are bent in directions away from each other are provided at the bottom of the caliper disk groove. It has a structure to be locked to.

This pad spring is one in which a locking arm and a cover are integrally formed, or a locking arm is provided at both ends of a locking tool formed of a member different from the above-mentioned cover, and a disk axial direction view is shown. Either of the one in which the cover part is held in place by holding the cover part from the outer peripheral side of the disk by the locking device having a gate shape and the cover part is pressed against the pad back plate by the spring force generated in the locking device. May be

In the latter pad spring which uses a separate locking device, an inverted U-shaped bending-back portion projecting to the outer peripheral side of the disk is provided in the middle of the locking device in the disk circumferential direction. Detachability is better.

In addition to the above, it is also preferable to provide an elastic arm in the cover portion which comes into contact with the shoulder portion of the pad back plate on the outer peripheral side of the disc and presses the friction pad in the disc rotation direction.

[0014]

When the locking arms at both ends are elastically deformed in the direction in which the distance between the arms is reduced and pushed into the opening of the caliper, the arms are elastically restored and the tips of the arms are locked to the bottom of the disk groove.
If a driver or the like is inserted between the locking arm and the caliper and the locking arm is elastically deformed again in the direction in which the distance between the arms is shortened, the locking with the bottom of the disk groove is released and the locking arm is disengaged. You can fix the spring without it,
It is easy to put on and take off.

In the case where the locking tool having the cover portion and the locking arm is formed as a separate member, the punching yield of the material is improved due to the simplification of the shape.

Further, in the case where the locking tool is provided with the inverted U-shaped bending-back portion, the bending-back portion can be compressed to reduce the distance between the arms, and the detachability is improved.

Further, in the case where the cover is provided with the elastic arm to press the pad in the disc rotation direction, the pad is always pressed against the torque receiving surface and the crawl noise at the initial stage of braking is also prevented.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the pad spring of the present invention in a used state.

In the figure, 1 is a caliper, 2 is an opening provided in a bridge portion of the caliper, 3 is a disc groove provided in the caliper, 4 is a pad for slidingly contacting a disc D, and 6 is an opening of the caliper 1. 2 is a pad pin mounted across the disk axial direction. The pads 4 and 5 are back plates 4a and 5a.
The pad pin 6 is slidably supported in the pin hole provided on the disk axially so that the inner cylinder and the outer cylinder of the caliper press the pistons (not shown) separately to make sliding contact with the disk D. There is.

Reference numeral 10 denotes a pad spring mounted in the opening 2 of the caliper 1. This pad spring 10
Has a flat plate-like cover portion 11. The cover portion 11 closes the opening 2. Further, the inner surface of the cover portion is such that the edges of the back plates 4a, 5a of the respective pads on the outer peripheral side of the disc are closer to the disc center side. It is designed to be pressed toward. In addition, the locking arm 1 is formed by bending the inside of the cover 11 at the center of both ends in the disk circumferential direction and bending the tips further in the directions away from each other.
2 is provided, and this locking arm is elastically deformed as shown by the chain line in FIG. 1 (b) and inserted into the opening 2, and is returned to the solid line position by elastic restoring force to return to the locking piece 12a at the tip. Is locked to the bottom of the disc groove 3.

As shown in FIG. 2, the tip portion of the locking arm 12 is double-folded to increase the strength, and the stability of fixing is improved even if the material plate is thin.

Further, as shown in FIG. 3, the pad spring 10 is divided into a cover portion 11 and a locking tool 13 made of a member different from the cover portion, and locking arms 12 are provided at both ends. When the stopper 13 is used to hold and support the cover 11 from the outside as shown in FIG. 3B, the shape of the cover 11 and the stopper 13 is simplified, and both are punched from the material plate. It is possible to cut out with a good yield and reduce material loss.

In this structure, it is necessary to hold the cover 11 at a fixed position by the locking tool 13, which is provided with the notch 14 at the edge of the cover 11 as shown in FIG. Fit the locking tool 13 into the notch, or as shown in FIG.
This can be easily realized by a method in which a groove 15 is provided midway in the disc axial direction of the cover portion 11 and the central portion of the locking tool 13 is dropped into the groove.

In FIG. 5, an inverted U-shaped bending-back portion 16 is provided midway in the disk circumferential direction of the locking tool 13. When the bending-back portion 16 is compressed, the locking arm 12 does not elastically deform itself, as shown by the chain line, the disk groove 3
The pad spring can be easily attached and detached only by hand. The pad spring shown in FIG. 1 may also be provided with such a bend-back portion in the middle of the cover portion 11 and attached and detached in the same manner, but in this case, a force is required to compress the bend-back portion. On the other hand, in the structure of FIG. 5, since the width of the bend-back portion is narrow, the compression does not require much force.

FIG. 6 shows still another embodiment. In addition to the locking arm 12, the pad spring 10 contacts the shoulders of the back plates 4a, 5a of the pad to urge the pads 4, 5 in the rotation direction of the disk D, and the torque receiving surface 7 of the caliper 1 is pressed.
An elastic arm 17 is provided for pressing against. If this pad spring is used, it is possible to eliminate the squeaking noise generated when the back plate of the pad collides with the torque receiving surface 7 at the initial stage of braking.

The cover 11 may be provided with a viewing window 18 (see FIG. 3) for visually confirming the wear condition of the pad.

Further, the locking piece 12 at the tip of the locking arm 12
In order to secure a clearance between the groove bottom of the disk groove 3 and the outer peripheral surface of the disk D, a may be formed with a seat portion for further digging the groove in the groove bottom of the disk groove 3 and locked there. Good.

[0028]

As described above, the pad spring of the present invention has a structure in which locking arms are provided at both ends of the cover and the locking pieces at the tips of the arms are locked in the disc groove of the caliper to be mounted. Therefore, the cost of the brake can be reduced without the need for screws or screw holes.

Further, since the spring can be easily attached and detached, the pad replacement work is not complicated.

[Brief description of drawings]

FIG. 1A is a plan view showing an example of a pad spring of the present invention in a used state, and FIG. 1B is a cross-sectional view taken along line AA of the same.

FIG. 2 is a sectional view of another embodiment.

FIG. 3A is an exploded perspective view of yet another embodiment. FIG. 3B is a sectional view showing a usage state of the pad spring.

FIG. 4A is a perspective view of a cover portion of another embodiment, and FIG. 4B is a cross-sectional view taken along line BB of the same.

FIG. 5 is a cross-sectional view of a pad spring in which a bending return portion is provided on a locking tool in a used state.

FIG. 6A is a plan view of a pad spring with an elastic arm in use, and FIG. 6B is a cross-sectional view taken along line CC of the same.

[Explanation of symbols]

 1 Caliper 2 Opening 3 Disc Groove 4, 5 Pad 4a, 5a Pad Back Plate 6 Pad Pin 7 Torque Receiving Surface D Disc 10 Pad Spring 11 Cover 12 Locking Arm 12a Locking Piece 13 Locking Tool 14 Notch 15 Groove 16 Bend back part 17 Elastic arm 18 Peep window

Claims (4)

[Claims] 1. A bridge portion of a caliper that straddles a disk is provided with an opening portion through which a pair of opposed friction pads slidably contacting the disk can go in and out, and a pad pin extending horizontally in the opening portion is used as a pin hole of a pad back plate. In a disc brake that supports a pair of friction pads slidably in the disc axial direction, a plate that covers the opening and presses the edge of the pad back plate on the outer peripheral side of the disc toward the center of the disc. -Like pad springs, and locking arms for locking the locking pieces at the ends, which are inserted into the openings and bent in directions away from each other, to the disk groove bottom of the caliper, Pad spring for disc brakes. 2. The locking arms are provided at both ends of a locking tool formed as a member different from the cover section, and the cover section is provided on the outer circumference of the disk with the locking tool having a gate-shaped view in the axial direction of the disk. 2. The disc spring pad spring according to claim 1, wherein the pad spring for disc brake is held from the side and held in a fixed position, and the cover portion is pressed against the pad back plate by a spring force generated in the locking tool. 3. The disc brake pad spring according to claim 2, wherein an inverted U-shaped bending return portion projecting to the outer peripheral side of the disc is provided midway in the disc circumferential direction of the engaging member. 4. The disc brake pad spring according to claim 1, wherein the cover portion is provided with an elastic arm that comes into contact with a shoulder portion of the pad back plate on the outer peripheral side of the disc and presses the friction pad in the disc rotation direction. .