JPS638337B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake equipped with a pad clip, and more particularly to a disc brake that has a pair of brake pads on both sides of a disc and slides the brake pads in the axial direction of the disc along a guide member. The present invention relates to a disc brake equipped with a pad clip that biases the pair of brake pads in the direction away from the disc and toward the rotation side, and has a wear warning section to notify wear of the brake lining.

Generally, in a disc brake, a pair of brake pads are arranged on both sides of the disc, and a hydraulic device presses the pair of brake pads on both sides of the disc to generate braking force.

The disc brake with the above structure requires a spring that biases the brake pads away from the disc when the hydraulic pressure to the hydraulic system is released, and when the brake is activated, the brake pads are moved toward the retracted side by the disc (the side where the disc rotates). )
In order to prevent the pad from colliding with the pad guide member and causing abnormal noise when the pad is moved, a spring is required to bias the pad toward the retracting side in advance, and conventionally, both springs (clips) are provided separately. However, as the number of parts increases, assembly becomes complicated, resulting in high costs.

This invention aims to eliminate the above-mentioned drawbacks.
There is an elastic connecting part that biases the brake pads away from the disc, an elastic locking part that biases the brake pads toward the retracting side, and when the brake lining wears to the wear tolerance limit, it comes into contact with the disc and emits a warning sound. The object of the present invention is to provide a disc brake in which a wear warning part is provided with a pad clip integrally formed by bending a spring material, and the pad clip is supported by a guide member and locked between both pad brakes.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings. The drawings show an embodiment in which the present invention is applied to a floating caliper type disc brake.

1 is a disk that rotates in the direction of the arrow in the figure when moving forward together with a wheel (not shown); 2 is an outer brake pad placed on the outside of disk 1; and 3 is an inner brake pad placed on the inside of disk 1. The brake pads 2 and 3 each consist of brake linings 4 and 5 that are pressed against the disc 1 during braking, and back metals 6 and 7 that are fixed to the back surface of the brake lining and extend on both sides in the rotational direction.

Numerals 8 and 9 are pin-shaped guide members extending in the disk axial direction attached to a support 10 fixed to the vehicle body, and the brake pads 2 and 3 are attached to the disk side of the guide member 8 on the rotation side (disc rotation delay side). Holes 6a and 7a drilled on the rotation side of the back plates 6 and 7 are slidably fitted, while holes 6a and 7a drilled on the rotation side of the back plates 6 and 7 are fitted in a sliding manner, while a notch is formed in the guide member 9 on the rotation side (the side where the disk rotates). The semicircular fitting portions 6b and 7b are fitted together.

11 has a shape that straddles the disk 1 and has an outer pad support part 11a on the outside part, and an inner part 11
This is a caliper in which an inner pad pressing cylinder 12 is attached to the inner pad pressing cylinder 12.
It is slidably fitted into the protrusion on the opposite side of the disk No. 9.

Reference numeral 13 denotes a pad clip that locks on the retraction side between the brake pads 2 and 3, as shown in Fig. 3.
It is formed by bending a steel plate. The pad clip 13 is approximately U-shaped, and has a central connecting portion bent into a waveform to form an elastic connecting portion 14, and opposite side portions extending from both sides of the central connecting portion are bulged in a circular shape to form a guide member insertion hole. 15, 15 are formed, and both bearing parts 16, 16 are formed.
During assembly, elastic locking portions 17, 17 are formed which extend toward the pad side and whose tips protrude in the direction of separating from each other, and then are folded back into a U-shaped curve. Lining wear warning parts 18, 18 are integrally and continuously formed to protrude toward the disk side up to the thickness surface that comes into contact with the disk 1 when the brake linings 4, 5 are worn beyond the wear tolerance limit during installation.

The pad clip 13 is attached by slidably fitting the guide member mounting holes 15, 15 into the guide member 8 between the back metals 5, 6, and the elastic connecting portion 1
4 protrudes outward, and the elastic locking portion 1
7, 17 are projected between the insertion side of the guide member 8 and the brake pads 2, 3, and the curved portions 17a, 17a of the elastic locking portions 17, 17 are inserted into the holes 6c, 7 of the back plates 6, 7.
Insert the lining wear warning part 1 at the tip of the
8 and 18 are opposed and protrude toward the disk 1 side. By attaching the pad clip 13 in this manner, the elastic force of the wave-shaped bent portion of the elastic connecting portion 14 urges the insertion side tips of the back metals 5 and 6 in a direction away from the disk side, and the elastic locking portions 17 and 1
The elastic force of the curved portion 7 urges the back metals 5 and 6 toward the extraction side.

In addition, back metals 6 and 7 are provided at the tip of the guide member 9 on the extraction side.
A stopper part 20 is provided to prevent the back metals 6 and 7 from coming off from the guide member when they are pushed apart by the pad clip 13. Further, a sealing boot 21 filled with grease is interposed on the outer periphery of the guide members 8 and 9 from between the support 10 and the caliper 11 to the tip of the caliper 11, and a cap 22 is attached to the tip of the guide members 8 and 9. There is. 23 is a hydraulic pressure supply/discharge port to the cylinder 12, and 24 is a lining abrasion hole drilled in the caliper 11.

In the disc brake having the above structure, when hydraulic pressure is supplied to the cylinder 12 during braking, the cylinder 12
The inner brake pad 3 is pressed against the inner surface of the disc 1 by the inner piston 25, and
The reaction force acts on the caliper 11, and the caliper 11
slides toward the inner side along the guide members 8 and 9, and as the caliper 11 moves, the outer brake pad 2
is pulled toward the inner side against the elastic force of the padded clip and pressed against the outer surface of disk 1,
Brake pads 2 and 3 on both sides of this disc 1
Braking force is generated by the pressing force.

During the above-mentioned braking, a force is applied to the brake pads 2 and 3 by the disk 1 to move them toward the rotation side, but
Since the elastic locking portions 17, 17 of the pad clip 13 are biased in advance toward the retraction side, the brake pads 2, 3 are prevented from moving toward the retraction side and colliding with the guide member 9 on the retraction side. be done.

When the brake is released and the hydraulic pressure to the cylinder 12 is released, the inner brake pad 3 is pushed toward the inner side and the outer brake pad 2 is pushed toward the outer side due to the repulsive force of the elastic connection portion 14 of the pad clip 13. and moves away from disk 1.

In addition, the lining 4 of the brake pads 2 and 3,
When the wear of the disc 5 exceeds an allowable limit, the lining wear warning parts 18, 18 of the pad clip 13 come into contact with the disc 1 and generate a warning sound.

In this case, the lining wear warning parts 18, 18
are formed in the form of extensions at the tips of portions 17a, 17a that protrude in the direction away from the disk and then fold back into a U-shaped curve, so that when it comes into contact with the disk surface, it will appear as shown by the broken line in Fig. 5. , a vibration that is displaced toward the disk rotation side and then reversely displaced toward the disk rotation side (so-called stick slip phenomenon)
It repeats this and can be largely displaced toward the disk insertion side, making it easy to vibrate and effectively functioning as a warning sound generator.

As is clear from the above description, according to the present invention, the spring that biases the brake pads in the direction away from the disc, which were conventionally provided and attached separately, and the spring that biases the brake pads toward the rotation side are integrated. This reduces the number of parts, simplifies assembly work, and reduces costs. In addition, the padded clip has a simple structure made by continuously bending a steel plate, etc.
It also has a lining wear warning section, which has the effect of exhibiting various functions.

[Brief explanation of the drawing]

1 is a partially sectional side view showing an embodiment of the present invention, FIG. 2 is a view taken in the direction of the arrow in FIG. 1, FIG. 3 is a perspective view of the pad clip, and FIG. 5 is a sectional view taken along line BB in FIG. 2. 1... Disc, 2, 3... Brake pad, 4,
5... Lining, 6, 7... Back metal, 8, 9... Guide member, 10... Support, 11... Caliper, 13... Pad clip, 14... Elastic connection part, 17, 17...
Elastic locking portion, 18, 18... Lining wear warning portion.

Claims (1)

[Claims] 1. In a disc brake in which a pair of brake pads are arranged on both sides of the disc and the brake pads are slid in the axial direction of the disc along two guide members extending in the axial direction of the disc, the brake pads are engaged between the pair of brake pads. The pad clip includes a pair of opposing support portions each having a guide member insertion hole through which a guide member on the disk insertion side is inserted, and a pad clip that is connected between the two at one end side of the pair of support portions. an elastic connecting part that connects the two brake pads and urges both brake pads in a direction away from the disk; A pair of elastic locking parts that come into contact with the brake pads and urge the brake pads toward the disk rotation side, and a pair of elastic locking parts that extend from the free end of the elastic locking parts and protrude toward the disk side up to the wear tolerance limit thickness of the brake lining. A disc brake characterized by being integrally formed with a pair of wear warning parts.