JP2580474Y2 - Pad wear warning device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad wear warning device for a disk brake which detects an allowable pad wear limit and electrically alerts a driver.

[0002]

2. Description of the Related Art A conventional technique of this type is disclosed, for example, in Japanese Utility Model Laid-Open No. 62-66031, which is bent in the middle and fixed to a back plate with bolts, and has a U-shaped notch. U with the mounting plate formed on the mounting plate
By rotating a predetermined amount after passing through the letter-shaped notch, the stopper is locked and the wear warning sensor is prevented from coming off by the elastic force of the mounting plate.

[0003]

However, in the above-mentioned prior art, since the mounting plate is fixed to the back plate with bolts, the mounting plate cannot be detached, and the wear warning sensor attached to the mounting plate cannot be detached. Becomes Therefore, the wear warning sensor must be replaced when the brake pad is replaced other than when the pad is worn.

Therefore, an object of the present invention is to make it possible to replace a brake pad without replacing a wear warning sensor.

[0005]

[Structure of device]

[0006]

First technical means taken by the present invention to solve the above technical problems SUMMARY OF THE INVENTION, in pad wear warning device to alert the wear limit of the brake pad electrically, its A disc that rotates integrally with the wheel on one side
Crawler and can be integrated into the other side.
Inner brake pad with inner back plate
And the inner on one side of the inner back plate
-The inner back from the non-contact part with the brake pad
Fitting part that fits into a through hole that penetrates the other side of the plate
And the through hole provided on one side of the fitting portion.
A large-diameter portion having a diameter larger than the diameter of the
A circle formed on the outer periphery of the portion penetrating through the through hole on the side
A body with a circumferential notch, and an interior of the body
And is cut by friction with the disk rotor
A wear warning sensor having a harness
-Installed on the back plate and fitted in the notch
And an undulating portion for urging the body toward the other side.
Between the leaf spring and the disk rotor.
By being cut by friction, the brake
And a disconnection detection circuit for detecting a wear limit of the metal .

A second technical measure taken in the present invention to solve the above technical problem is a pad wear warning device for electrically warning a wear limit of a brake pad,
One side touches the disk rotor that rotates together with the wheel
It is possible, and the inner back
An inner brake pad having a
The inner brake pad on one side of a back plate
The other side of the inner back plate from the non-contact portion with
Is fitted in a through hole that penetrates through and penetrates the through hole.
Circular cutouts formed on the outer circumference of one side and the other side
Due to friction with the disk rotor embedded inside
A wear warning sensor having a harness to be cut;
It is installed on the inner back plate,
With the wear warning sensor facing the other side.
A leaf spring having an undulating portion for urging, and the harness
By being cut by friction with the disk rotor
Disconnection detection for detecting the wear limit of the brake pad
And a circuit .

[0008]

The first technical means operates as follows.
The wear warning sensor is brought into contact with a through-hole formed in the inner back plate, with a large diameter portion having a larger diameter than the through hole formed in the inner back plate formed in the wear warning sensor, and provided on the wear warning sensor. The undulating portion formed on the leaf spring is brought into contact with the cutout, and the wear warning sensor can be installed on the inner back plate by the urging force of the undulating portion.

[0009] The second technical means operates as follows. The abrasion warning sensor is fitted into the through hole formed in the inner back plate, and the plate spring is locked in both notches formed in the abrasion warning sensor. A warning sensor can be installed on the inner back plate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments to which the present invention is applied will be described below in detail with reference to the accompanying drawings.

A wear warning sensor 1 according to a first embodiment will be described with reference to FIG. 2 which shows a sectional view taken along the line AA shown in FIG.

The wear warning sensor 1 has a body 2 formed of a thermosetting resin. The body 2 is made of
A fitting portion fitted into the through hole 13 and one side of the fitting portion (FIG. 3)
Formed on the large diameter portion 2a disposed on the lower side) and the fitting portion.
A notch 2b is provided. Further, a harness 3 having a U-shaped detecting portion 3a is embedded inside the body 2, and the harness 3 is connected to a disconnection detecting circuit 31 (see FIG. 5) via a connector (not shown). When the detecting portion 3a is cut by friction with the disk rotor 21 (see FIG. 4) that rotates integrally with the wheel, the disconnection detecting circuit 31 (see FIG. 5) detects the wear limit of the brake pad, and (See FIG. 5).

Next, an installation method of the wear warning sensor 1 is shown in FIG.
This will be described with reference to FIGS.

In FIG. 1, an inner back plate 1
1a is provided with a through hole 13 into which the body 2 of the wear warning sensor 1 is fitted. Assembly of wear warning sensor 1
In FIG. 2, first, the inner
The inner brake pad 22 of the back plate 24 is arranged.
From one side (the lower side in FIG. 3) of the body 2
By inserting the fitting portion, the large-diameter portion 2a is
Abuts against one side surface of the back plate 24 and
The other side portion protrudes from the through hole 13, and the other side portion has a shape.
The formed notch 2b is exposed from the through hole 13.
You. Next, the U-shaped leaf spring 12 is
Engage with notch 2b while engaging with rate 24
As a result, the body 2, and eventually the wear warning sensor
1 is installed on the inner back plate 24.

The leaf spring 12 is provided on the inner back plate 1.
1a is fitted with a bent portion 12b, and a notch is formed at both ends of the U-shape by cutting and bending.
2a is engaged with a notch 14 (see FIG. 3) formed in the inner back plate 11a, and is installed on the inner back plate 11a. The leaf spring 12 has an undulating portion.
12c are formed, and the undulations 12c are notches.
Part 2b and the elastic force of the undulating part 12c.
3 shows that the body 2 and thus the wear warning sensor 1 are shown in FIG.
3 is urged toward the other side (upward in FIG. 3).

Next, the operation in the case where the inner brake pad 10a is worn by the friction with the rotor 21 by the braking action and the wear limit of the inner brake pad 10a is detected will be described.

In FIG. 4, when a driver depresses a brake pedal (not shown), a booster (not shown) is provided.
The hydraulic pressure increased by the master cylinder (not shown)
The piston 23 slides toward the rotor 21 side, and the inner brake pad 10a, which is in contact with the distal end of the piston 23, moves toward the rotor 21 and comes into contact with the rotor 21 to perform a braking operation. Is what you do. The outer brake pad 10b is connected to the cylinder 26
Moves toward the inner side via the disk brake caliper 24 due to the reaction force of the hydraulic pressure, and the inner brake pad 10
Similarly to a, the rotor 21 comes into contact with the rotor 21 to perform a braking operation.

When the degree of wear of the inner brake pad 10a reaches the wear limit and the driver depresses a brake pedal (not shown), the large diameter portion 2a of the wear warning sensor 1 comes into contact with the rotor 21 and sequentially. Wear it off,
When the detecting section 3a is cut off by friction with the rotor 21, the disconnection detecting circuit 31 (see FIG. 5) detects the wear limit of the inner brake pad 10a and turns on the lamp 32 (see FIG. 5). Warn the driver.

Next, a second embodiment will be described with reference to FIGS. 5 to 7 using the same reference numerals for the same members as in the first embodiment.

In FIG. 7, one side of a wear warning sensor 40 is shown.
A notch 41 is formed in the lower part of FIG. 7, and the notch 41 has an extending portion 42 a formed in the leaf spring 42.
Are the same as those in the first embodiment except that they are fitted to prevent the wear warning sensor 40 from dropping to the other side .

Further, in the first and second embodiments, another circuit is provided, and once the wear limit of the inner brake pad 10a is detected, the wear limit of the inner brake pad 10a is determined by the circuit. You can leave a warning.

[0022]

[Effects of the Invention] In the present invention, the wear warning sensor is mounted on the inner back plate by the urging force of the undulating portion formed on the leaf spring. Therefore, it is not necessary to replace the wear warning sensor when replacing the brake pad.

Further, by providing the wear warning sensor at the non-contact portion of the inner back plate with the inner brake pad, the area of the brake pad is not sacrificed, and the braking force does not drop.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment to which the present invention is applied.

FIG. 2 is a sectional view taken along the line AA shown in FIG.

FIG. 3 is a sectional view taken along the line BB shown in FIG. 1;

FIG. 4 is a cross-sectional view showing a structure of a disc brake caliper on which the embodiment is installed.

FIG. 5 is a circuit diagram for detecting and alarming wear of the brake pad.

FIG. 6 is a plan view showing a second embodiment to which the present invention is applied.

FIG. 7 is a sectional view taken along the line CC shown in FIG. 6;

FIG. 8 is a sectional view taken along the line DD shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Wear warning sensor 2a ... Large diameter part 2b ... Notch 3 ... Harness 10a ... Inner brake pad 11a ... Inner back plate 12 ... Leaf spring 12c ... Undulating part 13 ... Through-hole 31 ... Disconnection detection circuit 40 ... Wear warning sensor 41 ... Notch 42 ... Leaf spring

Claims (2)

(57) [Scope of request for utility model registration] A pad wear warning device for electrically warning a wear limit of a brake pad, wherein one side of the warning device contacts a disk rotor that rotates integrally with a wheel.
It is possible, and the inner back
An inner brake pad having a cover , and the inner brake on one side of the inner back plate.
From the non-contact portion with the rake pad,
A fitting portion fitted into a through hole penetrating the other side surface of the seat,
The diameter of the through hole, which is provided on one side of the fitting portion and
A large-diameter portion having a larger diameter than the other side of the fitting portion.
Circular shape formed on the outer periphery of the part penetrating the through hole
Body with a notch, and embedded inside the body.
And cut by friction with the disk rotor.
A wear warning sensor comprising a harness is installed in the inner backplate away the cut
And urges the body toward the other side.
A leaf spring having an undulating portion and the harness are cut by friction with the disk rotor.
The wear limit of the brake pad.
A pad wear warning device , comprising: a disconnection detection circuit for detecting . 2. A pad wear warning device for electrically warning a wear limit of a brake pad, wherein one side of the pad wear warning device abuts a disk rotor that rotates integrally with a wheel.
It is possible, and the inner back
An inner brake pad having a cover , and the inner brake on one side of the inner back plate.
From the non-contact portion with the rake pad,
The through hole is fitted into a through hole penetrating the other side of the
The circumference formed on the outer circumference of one side and the other side part that penetrates
Shaped notch and the disk rotor embedded inside
Wear warning with harness cut by friction
A sensor and the notch mounted on the inner back plate.
The wear warning sensor to the other side
A leaf spring having an undulating portion that is biased by force, and the harness is cut by friction with the disk rotor.
And a disconnection detecting circuit for detecting a wear limit of the brake pad by being disconnected.