JPS6138236A - Alarm device for pad wear of disk brake - Google Patents

Abstract

PURPOSE:To obtain a loud alarm sound by providing a wear indicator to a splash guard to resonate the sound, which is made by the wear indicator when contacting with the rotating face of a disk, with the splash guard. CONSTITUTION:A splash guard 5 for preventing the side face of a disk 1 from sticking of rainwater or mud is provided. This splash guard 5 can become a resonator made of sheet metal. A wear indicator 6 is fixed to the splash guard 5 at its clamp portion 6a. The nose of this wear indicator 6 forms an indicator section 6d through a resonator section 6b. And the wear of a pad 3 causes the indicator 6d to contact with the disk 1 by a pad backing plate 7. This sound made by the contact may be resonated through the resonator section 6b and the splash guard 5 to increase its volume.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pad wear warning system for disc brakes.
It is related to.

[Conventional technology]

In disc brakes, which obtain braking force by squeezing the disc with a pair of friction pads placed on both sides of the disc, wear of the pad lining is unavoidable, so the pad should be replaced when it has worn to a certain degree. This is desirable.

Therefore, conventionally, a wear indicator is attached to the back plate of the friction pad, and its tip protrudes a predetermined amount from the interface between the back plate and the pad lining to the pad lining side. A pad wear warning device is provided which emits an alarm sound when the pad comes into contact with the pad.

[Problem that the invention seeks to solve]

Such conventional devices notify the degree of pad wear by a relatively low-volume warning sound that is emitted when the tip of the tongue of the wear indicator comes into contact with the disc, so any sound other than this warning sound is , for example, it is difficult to distinguish it from engine noise.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disc brake pad wear warning device that increases the volume of the warning sound, thereby making it easier to distinguish it from other sounds and providing even more reliable notification.

[Means for solving problems]

In order to solve the above problems, the present invention includes a contact part that comes into contact with the caliper body or pad that moves to the disc surface during braking, and an indicator part that extends from the contact part and faces the rotating surface of the disc. The wear indicator is provided on a splash guard provided on the side surface of the disk, and the tip of the indicator portion is opposed to the rotating surface of the disk.

[Effect]

Therefore, when the pad lining wears down to a certain amount,
The caliper body or butt pushes the contact part, and the tip of the indicator part contacts the disc, producing a contact sound.
This contact sound is resonated by the wear indicator and the splash guard to produce a loud warning sound.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 and 2.

A disc 1 that rotates together with the wheel is supported by a bracket 2 and has a caliper 4 that clamps the disc 1 with friction pads 3 placed on both sides of the disc 1 for braking action. A splash guard 5 made of a thin plate is provided to prevent rainwater and mud from adhering.

The wear indicator 6 fixed to the splash guard 5 has a mounting part 6a attached to the splash guard 5 at one end of a plate having spring properties, and a mounting part 6a.
a resonance portion 6b extending from the disk and bending in the axial direction of the disk;
The back plate includes a back plate contacting portion 6c that extends from the resonance portion 6b and bends between the back plate 7 of the friction pad 3 and the disk 1 along the rotating surface of the disk 1 and comes into contact with the inner surface 7a of the back plate 7. The disk 1 extends from the contact portion 6G and bends in the disk axial direction.
The indicator part 6d is fixed to the splash guard 5 with a pin or bolt 8 through a mounting hole 6e provided in the mounting part 6a.

Then, insert the resonance part 6b between the friction pad 3 and the bracket 2, bring the back plate contact part 6C into contact with the inner surface 7a of the back plate 7, and place the tip of the indicator part 6d against the rotating surface of the disc 1. The pad linings 3a are arranged to face each other and come into contact with the rotating surface of the disk 1 when the pad lining 3a is worn down to a predetermined amount.

Since the wear indicator 6 is configured and attached to the splash guard 5 as described above, not only is the length of the resonance part 6b sufficient, but since the splash guard 5 is formed of a thin plate, the indicator part 6d is attached to the disc 1. The contact sound generated by contact with the object can be resonated and made into a loud alarm sound. Further, since the back plate contact portion 6C is in contact with the inner surface 7a of the back plate 7, a force is exerted to separate the friction pad 3 from the disk 1, thereby preventing the friction pad 3 from dragging.

Furthermore, since the splash guards 5 are arranged on both sides of the disc 1, the wear indicator 6 can be attached to either side.

Further, in this embodiment, the wear indicator is provided on the input side of one disk, but it may be provided on the output side of the disk, or on both sides of the input side and the nine output side of the disk.

In the case of a floating type caliper structure, since the reaction force piece comes close to the disc braking surface due to wear of the pad lining, the contact portion of the indicator may be pushed by the reaction force piece.

FIG. 3 shows another embodiment, in which the wear indicator 9 includes a mounting portion 9a, a resonance portion 9b bent from the mounting portion 9a in the disk axial direction, and a resonance portion 9b extending from the resonance portion 9b to the rotating surface of the disk 1. It consists of a back plate abutting part 9C bent in parallel and an indicator part 9d bent from the back plate abutting part 9G in the disk axial direction so that its tip faces the rotating surface of the disk 1. When the hole 9e is fixed to the splash guard 5 and the pad lining 3a is worn a predetermined amount, the inner surface 7a of the back plate 7 pushes the back plate abutting part 9C to bring the indicator part 9d into contact with the rotating surface of the disk 1. It has the same effect as the previous embodiment.

In both of the above embodiments, the wear indicator is attached to the splash guard separately, but the wear indicator may extend from the splash guard and be formed integrally with the splash guard.

[Effects of the Invention] As described above, the present invention has a contact portion that contacts the caliper body or pad that moves to the disk surface during braking, and an indicator portion that extends from the contact portion and faces the rotating surface of the disk. A wear indicator is installed on the splash guard provided on the side of the disc, and the wear indicator is pushed by the caliper body or pad so that the tip of the wear indicator comes into contact with the rotating surface of the disc when the pad lining wears out a predetermined amount. As a result, the contact sound of the wear indicator can be resonated between the wear indicator and the splash guard to produce a loud alarm sound.

[Brief explanation of drawings]

FIG. 1 is a front view of a disc brake with a wear indicator attached to a splash guard, FIG. 2 is a sectional view showing one embodiment of the wear indicator, and FIG. 3 is a sectional view showing another embodiment. DESCRIPTION OF SYMBOLS 1... Disc, 2... Bracket, 3... Friction pad, 4... Caliper, 5... Splash guard, 6... Wear indicator, 6a... Mounting part,
6b...Resonance part, 6C...Back plate contact part, 6d...
Indicator part, 7...Friction pad back plate

Claims (1)

[Claims] 1. In disc brakes, which have a splash guard on the side of a disc that rotates together with the wheel, and which performs braking by squeezing the disc with a pair of friction pads, the splash guard comes into contact with the caliper body or pad that moves against the disc surface during braking. A wear indicator having a contact portion and an indicator portion extending from the contact portion and facing the rotating surface of the disk is provided on the splash guard, so that the indicator portion comes into contact with the disk when the pad lining wears a predetermined amount. A disc brake pad wear warning device characterized by: