JPH04114138U - Pad wear warning device - Google Patents

Abstract

(57) [Summary] (with modifications) [Purpose] The purpose is to provide a wear warning sensor that can be installed even in a small space. [Structure] A disc rotor that rotates together with the wheel, and a conductive film that is coated on the surface of a roughly rectangular parallelepiped block that detects the wear limit of the brake pads by being cut by the friction between the disc rotor and the disc rotor. Detection section 6
and a disconnection detection circuit electrically connected to the detection section via a harness 7.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention electrically detects the permissible wear limit of brake system pads and provides an alarm. related to a device for

0002

[Conventional technology]

As a conventional technique of this kind, there is, for example, Japanese Patent Application Laid-open No. 149434/1983. However, this is guided through a through hole formed in the back plate that is integrated with the brake pad. Insert the sensor together with the member through the leaf spring, and insert the tip into the sensor in a U-shape. A disk in which a formed linear conductor is embedded and the conductor rotates together with the wheel. Detects brake pad wear limit by cutting due to friction with rotor It is something to do. .

0003

[Problem that the idea aims to solve]

However, in the above-mentioned conventional technology, the wear limit of the brake pad is set by The linear conductor formed in the shape of a letter is cut due to friction with the disc rotor. The conductor is linear, and when assembling the sensor, the conductor is Do not increase the space in which the sensor will be assembled, as there is a risk of damage to the body. There was a problem that I had to do.

0004 Therefore, in this invention, we developed a wear warning sensor that can be installed even in small spaces. The challenge is to supply

[0005]

[Structure of the idea]

[0006]

[Means to solve the problem]

The technical measures taken in this invention to solve the above technical problem are brake pads. In a pad wear warning device that electrically warns the wear limit of the pad, the guide means It is coated on the surface and is cut by friction with the friction means linked to the wheel. By doing so, a conductive detection part that detects the wear limit of the brake pads is installed. This is something I tried to prepare for.

[0007]

[Effect]

The technical means works as follows. conductive coating on the guide means By cutting off the detection part, it is possible to detect the wear limit of the brake pads. can.

[0008]

【Example】

Hereinafter, embodiments to which the present invention is applied will be described in detail with reference to the accompanying drawings.

[0009] In FIG. 1, the disc brake caliper 20 is hydraulically connected to a wheel (not shown). The inner brake pad 22 is attached to the disc rotor 21 (see Fig. 5), which rotates integrally with the disc rotor 21 (see Fig. 5). (see Fig. 5) and outer brake pad 23 (see Fig. 5) are pressed together to perform braking action. The wear warning sensor 1 detects the wear limit of the inner brake pad 22. It electrically detects the field and issues an alarm.

0010 In Figure 2, which shows an enlarged view of the range R shown in Figure 1, the wear warning sensor 1 is an inner back plate that is integrally bonded to the inner brake pad 22. It is provided in the part of the seat 24 that protrudes from the inner brake pad 22. It is inserted into the through hole 2.

[0011] In FIG. 3, the wear warning sensor 1 includes a body 3 made of thermosetting resin. body 3 is formed with a large diameter part 4 having a larger diameter than the through hole 2 at the lower part, and the outer periphery of the upper part An annular groove 5 is formed in. Also, inside the body 3, there is a disk rotor 2. The wear limit of the inner brake pad 22 is A detection unit 6, which will be described later, is embedded to detect the field. The detection unit 6 has a harness 7 is connected, and the harness 7 is connected to the disconnection detection circuit 31 via a connector (not shown). It is continued.

0012 Next, a method for installing the wear warning sensor 1 will be explained with reference to FIGS. 2 and 3. stomach The wear warning sensor 1 is inserted into the through hole 2 provided in the inner back plate 22. Insert from the rotor 21 side. At this time, the large diameter portion 4 has a larger diameter than the through hole 2. In particular, the wear warning sensor 1 has its large diameter portion 4 in contact with the inner back plate 24. is inserted until it is inserted. After inserting the wear warning sensor 1, it protrudes toward the center on the inner circumference. A retaining ring 8 having a protrusion 8a is fitted into the groove 5 so as to lock the protrusion 8a in the groove 5. match. In addition, the projection 8a is raised upward in FIG. 3, and due to its elastic force, The wear warning sensor 1 is biased in the same direction.

[0013] In FIG. 4, the detecting unit 6 has three surfaces of the outer periphery of the block 9, which is a substantially rectangular parallelepiped, covered with copper foil, etc. A conductor 10 is welded thereto. The conductor 10 on the side is connected to the harness 7 for soldering. More connected. Further, the material of the conductor 10 may be any material as long as it has conductivity. However, it is not particularly limited to copper foil.

[0014] Next, the inner brake pad 22 is brought into contact with the disc rotor 21 due to the braking action. When detecting the wear limit of the inner brake pad 22 due to wear due to friction. Explain the operation.

[0015] In FIG. 4, when the driver depresses the brake pedal (not shown), the driver brakes. The hydraulic pressure increased by the master cylinder (not shown) is transferred from the master cylinder (not shown). is introduced into the cylinder part 25, the piston 26 slides toward the disc rotor 21, and the piston 26 slides toward the disk rotor 21 side. The inner brake pad 22 that is in contact with the tip of the stone 26 is The rotor 21 moves toward the disc rotor 21 and comes into contact with the disc rotor 21 to perform a braking action.

[0016] In addition, the outer brake pad 23 is configured such that the cylinder portion 25 is activated by the reaction force of the hydraulic pressure. Move to the inner side via the scrub brake caliper 20 and remove the inner brake part. Similar to the door 22, it comes into contact with the disk rotor 21 side and performs a braking action.

[0017] The degree of wear of the inner brake pads 22 has reached its wear limit, and the driver When the brake pedal (not shown) is depressed, the large diameter portion 4 of the wear warning sensor 1 comes into contact with the disc rotor 21 and is gradually worn out, and the detection part 6a detects the disc rotor 21. If the wire is disconnected due to friction with the wire 21, the disconnection detection circuit 31 (see FIG. 5) Detects the wear limit of the inner brake pad 22 and turns on the lamp 32 (see Figure 5). lights up to warn the driver.

[0018] Further, in the above embodiment, another circuit is provided, and once the inner brake pad 2 When the wear limit of the inner brake pad 22 is detected, the circuit It is possible to remain alert of wear limits.

[0019]

[Effect of the idea]

In this invention, the conductor coated on the guide means is cut, so that the brake Since the wear limit of the pad can be detected, the pad is smaller than a linear conductor. A wear warning sensor can be installed at pace.

[Brief explanation of drawings]

FIG. 1 is a plan view of a disc brake caliper in which an embodiment of the present invention is installed.

FIG. 2 is an enlarged view of range R shown in FIG. 1;

FIG. 3 is a sectional view taken along line AA shown in FIG. 2;

FIG. 4 is a perspective view showing the structure of this embodiment to which the present invention is applied.

FIG. 5 is a sectional view of a disc brake caliper in which an embodiment of the present invention is installed.

FIG. 6 is a circuit diagram for detecting and warning brake pad wear.

[Explanation of symbols]

1... Wear warning sensor 2...Through hole 3...Body 6...detection section 7...Harness 8...Keeping ring 9... Guide means (block) 10... Conductor 21...Friction means (disc rotor)

Claims (1)

[Scope of utility model registration request] Claim 1: In a pad wear warning device that electrically warns the wear limit of brake pads, the pad wear warning device is coated on the surface of a guide means and is cut by friction with a friction means interlocked with a wheel. A pad wear warning device comprising a conductive detection section that detects the wear limit of a brake pad.