JPH081308Y2 - Friction pad wear alarm device for vehicle disc brakes - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction pad wear alarm device in which a plate-shaped wear indicator is attached to a back plate of a friction pad of a vehicle disc brake.

[0002]

2. Description of the Related Art As an alarm device for alarming wear of a lining of a friction pad of a vehicle disc brake, there is an alarm device disclosed in, for example, Japanese Utility Model Publication No. 61-12423.

In this alarm device, the plate-shaped wear indicator mounting portion is caulked and fixed to a protrusion provided on the rear surface of the back plate of the friction pad, and the tip of the wear indicator is opposed to the side surface of the disc rotor to prevent friction pad lining. When a predetermined amount of wear has occurred, the tip of the wear indicator slides on the side surface of the disk rotor to generate a wear alarm sound.

[0004]

However, in the above-mentioned one, when the binding hole for attaching the lining to the back plate is formed by the half piercing, the protrusion protruding on the back face of the back plate is used as the wear indicator attaching protrusion. However, since this protrusion is usually formed so that the fiber flow is not cut, the outer periphery of the base is bulged.

For this reason, if the mounting portion of the wear indicator interferes with the protrusion on the outer periphery of the projection base and is fixed by caulking, the mounting portion will be in a floating state, and water or the like will enter through the gap, causing rust.

Even if the bulge on the outer periphery of the protrusion base is removed, the rust preventive coating applied to the back plate of the friction pad accumulates on the outer periphery of the base, and the outer periphery of the protrusion rises. It peels off and rust occurs,
Mounting strength and durability are reduced.

Therefore, the present invention provides a friction pad wear alarm for a vehicle disc brake, which is capable of securely fixing a wear indicator on the back surface of the back plate to prevent rust and improve the mounting strength and durability of the wear indicator. The purpose is to provide a device.

[0008]

In order to achieve the above object, when the lining of the friction pad is worn by a predetermined amount, a plate-shaped wear indicator mounting portion which is in sliding contact with the side surface of the disc rotor is provided on the back surface of the friction pad back plate. In a friction pad wear alarm device for a vehicle disc brake, which is caulked and fixed to a provided projection, in a first invention, a groove is provided around a base of the projection, and in a second invention, the groove is provided. And a sealing material is attached to the gap between the indicator and the indicator.

[0009]

With the above structure, the bulge on the outer periphery of the base of the projection can be removed by forming the concave groove, and the inside of the concave groove becomes a coating reservoir, so that the mounting portion of the wear indicator is attached to the back plate of the friction pad. It can be attached closely to the back without any gaps.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention, in which a disc brake 1 slides a caliper body 2 on a caliper bracket 4 fixed to the vehicle body on one side of a disc rotor 3. It is movably supported in the disc axial direction via pins 5 and 5.

A cup-shaped piston is inserted in a cylinder hole formed in the caliper body 2, and a pair of friction pads 6, 6 arranged on both sides of the disc rotor 3 are provided.
Is pressed by the piston to clamp both sides of the disk rotor 3 to perform a braking action.

Each of the friction pads 6 and 6 comprises a lining 6a slidably contacting the side surface of the disk rotor 3 and a back plate 6b having the lining 6a fixedly provided. A wear indicator 7 is attached to make a warning sound by slidingly contacting one side surface of the disk rotor 3 when the lining 6a of the pad 6 is worn by a predetermined amount.

The wear indicator 7 is a metal plate body,
From the mounting portion 7b having the mounting hole 7a to the back surface 6c of the back plate 6b
Direction, and is bent in a loop shape toward the disc rotor 3 to form a resonance portion 7c, and the indicator portion 7d is provided between the side edge 6d of the back plate 6b and the caliper bracket 4 and the back plate 6b and the lining 6a. Is formed so as to project toward the disc rotor 3 side by a predetermined amount from the boundary surface.

On the back surface 6c of the back plate 6b of the one friction pad 6 to which the wear indicator 7 is attached, the lining 6 is provided.
When forming the binding hole 6e of a with half piercing,
A protrusion 6f projecting to the back side is provided so as to project.
A concave groove 6g is provided around the outer periphery of the base portion of f.

With this structure, the back plate 6b
Since the bulge on the outer periphery of the base of the projection 6f can be removed, and the inside of the recessed groove 6g becomes a coating pool, when the mounting hole 7a of the wear indicator 7 is inserted into the projection 6f and fixed by caulking, the mounting portion 7b is removed. The back plate 6b is closely attached to the back surface 6c without any gap.

Therefore, the wear indicator 7 is attached to the back plate 6
It can be securely attached to the back surface 6c of b to suppress the generation of rust and improve the durability. Further, since the protrusion 6f of the back plate 6b is formed so as not to cut the fiber flow, the strength of the protrusion 6f during crimping is high.

FIG. 3 shows a second embodiment of the present invention in which a seal ring 8 is sandwiched in the gap between the recessed groove 6g and the mounting portion 7b of the wear indicator 7. It is possible to reliably prevent rust from occurring in the groove g6 and the mounting portion 7b of the wear indicator 7.

[0019]

As described above, according to the present invention, a groove is formed on the outer circumference of the base of the protrusion provided on the back surface of the friction pad back plate to which the wear indicator is attached, or in the gap between the groove and the wear indicator. Since the seal material is attached, the friction pad back plate and the wear indicator can be securely attached without a gap. Further, since rust is not generated from the gap, durability can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG.

FIG. 2 is a front view of a disc brake showing a first embodiment of the present invention.

FIG. 3 is a cross-sectional view of an essential part showing a second embodiment of the present invention.

[Explanation of symbols]

1 ... Disc brake, 2 ... Caliper body, 3 ... Disc rotor, 6 ... Friction pad, 6a ... Lining, 6b
... back plate, 6c ... back surface of back plate, 6f ... protrusion, 6g ... concave groove,
7 ... wear indicator, 7a ... mounting hole, 7b ... mounting portion,
7c ... Resonance part, 7d ... Indicator part, 8 ... Seal ring

Claims (2)

[Scope of utility model registration request] 1. When a lining of a friction pad wears by a predetermined amount, a plate-shaped wear indicator mounting portion that is in sliding contact with a side surface of a disc rotor is caulked to a protrusion provided on the rear surface of the friction pad back plate. In the friction pad wear alarm device, a concave groove is provided around the base of the protrusion, and the friction pad wear alarm device for a vehicle disc brake is characterized. 2. When the lining of the friction pad wears by a predetermined amount, a plate-shaped wear indicator mounting portion that slides on the side surface of the disc rotor is caulked to a protrusion provided on the back surface of the friction pad back plate. In the friction pad wear alarm device, a concave groove is provided around the base of the protrusion, and a seal material is attached to a gap between the groove and the indicator, and a friction pad wear alarm for a vehicle disc brake is provided. apparatus.