JPH0217740B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake lining wear warning device that issues an alarm when the lining has worn down to a predetermined amount in a brake device used in a vehicle.

Conventionally, in disc brakes, when the lining of the friction pad that performs braking by pressing against the disc that rotates together with the wheel wears out a certain amount, it causes a decrease in braking performance. A brake lining wear warning system is provided to alert the user when this occurs. As this type of device, for example,
- A metal indicator is attached to a friction pad as disclosed in Specification No. 53161, and when the lining wears out a predetermined amount, it comes into contact with the disc and generates a scratching sound. −
As disclosed in Japanese Patent No. 40770, an electric alarm type is known in which when the core wire of an electric wire comes into contact with a disk, a base current flows through the circuit and a transistor becomes conductive, thereby lighting up an alarm lamp.

Disc brakes are equipped with one of the brake lining wear warning devices described above, but if malfunction occurs, there is no other warning means, so it is difficult to send a reliable warning to the user in such cases. There was a problem that made it impossible to do so.

The present invention has been made in view of the above, and its object is to provide a brake lining wear warning device with a dual alarm function by attaching a detection sensor that issues an electrical alarm to an indicator that produces an alarm sound. It is on offer.

In order to achieve the above object, the present invention provides an indicator on a friction pad that presses against a disk that rotates integrally with the wheel, and that slides into contact with the disk and generates an alarm when the brake lining wears out by a predetermined amount. It is characterized by the fact that it is equipped with a detection sensor that comes into contact with the disk and issues an electrical alarm.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

The bracket 1 is fixed to the vehicle body on one side of the disc 2 which rotates together with the wheel, and has a pair of support parts 1 that straddle the disc 2 at a predetermined interval in the disc circumferential direction.
a, 1a. On both sides of disk 2,
Friction pads 3, 4 are arranged, and the support parts 1a,
1a to move in the axial direction of the disk.
The caliper 5 straddles both friction pads 3 and 4 at a bridge portion 6, and an inner portion 7 and an outer portion 8 are located on both sides of the bridge portion 6. Arm portions 9 and 9 protruding from the inner portion 7 in the disk circumferential direction are attached to brackets. The sleeves 11, 11 are slidably provided on support pins 10, 10 which are screwed onto the sleeves 11, 11. Then, the caliper 5 pushes the inner friction pad 3 toward the disk by the operation of the piston 12 provided in the inner part 7, and brings it into sliding contact with the disk 2. On the other hand, this reaction force causes the caliper 5 to move the piston 12. It moves in the opposite direction to the direction of movement, and the outer friction pad 4 slides into contact with the disk 2 via the outer portion 8 to perform a braking action.

An indicator 13 made of a metallic plate is fixed to the back plate 3a of the inner friction pad 3 by caulking its base 13a with a caulking member 14. The tip end 13c of the indicator 13, which continues from the loop part 13b, protrudes by a predetermined amount from between the back plate 3c and the inner wall of the bracket 1 toward the brake lining 3b.

Therefore, when the lining 3b gradually wears out due to repeated braking operations, the tip 13c of the indicator 13 extends into contact with the disc 2 integrally with the back plate 3a, and when the wear reaches a set value, the tip 13c
3c comes into sliding contact with the disk 2 to emit a scratch alarm sound.

Further, a detection sensor 14 connected to the alarm circuit A is removably inserted into the tip portion 13c of the indicator 13.

The detection sensor 14 is formed by integrally molding the core wire 16 of the electric wire 15 with a probe 17 made of synthetic resin, for example, and inserts and fits the tip 13c of the indicator 13 into the blind hole 17a.
It is inserted by engaging the bent piece 13d formed in the locking hole 17b.

Then, the electric wire 15 is fixed to the loop portion 13b of the indicator 13 by a grommet 18, and then a clip 1 is attached to the arm portion 9 of the caliper 5.
9 and is connected to alarm circuit A.

The alarm circuit A includes a power supply 20, an alarm lamp 21, a transistor 22, and resistors 23, 24, and 25, and the brake lining 3b wears out, the core wire 16 in the probe 17 is exposed, and the braking is not performed. When the core wire 16 contacts the disk 2, the branch point potential of the bias resistors 23 and 24 is lowered to the ground potential, and as a result, the base current flows through the resistor 23 to the transistor 22, making the transistor 22 conductive and generating an alarm. Lamp 21 lights up. When the brake is released, the warning lamp 21 goes out, but if the core wire 16 is broken due to friction with the disk 2, the transistor 22 remains conductive and the warning lamp 21 remains lit regardless of the braking operation.

In this embodiment, the core wire 16 of the detection sensor 14 is
Disc 2 from the tip 13c of indicator 13
Since it is provided close to the side, when the brake lining 3b wears, the detection sensor 14 first turns on the alarm lamp 21, and when the wear progresses further, the tip 13c of the indicator 13 slides against the disc 2 and emits an alarm sound. . The positional relationship between the core wire 16 of the detection sensor 14 and the tip 13c of the indicator 13 with respect to the disk 2 is not limited to this. You may also make it emit.

As described above, in the present invention, a detection sensor that issues an electrical alarm is attached to an indicator that produces an alarm sound, so that double alarm activation can be performed simultaneously with one mounting means, and even if one of the alarms malfunctions, it is reliable. This will be a warning. Further, by placing the detection sensor and the indicator in contact with the disk at the front and back, a two-stage alarm can be obtained, and the user's attention can be more effectively called to attention.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a disc brake. Fig. 1 is a front view, Fig. 2 is a plan view, Fig. 3 is a sectional view of the main parts, and Fig. 4 is an indicator and a detection sensor. FIG. 3 is a diagram showing the installation state and alarm circuit. 3 is the friction pad on the inner side, 3a is the back plate, 3b
is the brake lining, 13 is the indicator, 1
3a is a base, 13b is a loop, 13c is a tip, 14 is a detection sensor, 15 is an electric wire, 16 is a core wire, and 17 is a probe.

Claims (1)

[Claims] 1. An indicator is provided on the friction pad that presses against the disk that rotates integrally with the wheel, and that slides against the disk and generates an alarm when the brake lining wears out by a predetermined amount, and the tip of this indicator comes into contact with the disk and generates an electrical alarm. A brake lining wear warning device characterized by being equipped with a detection sensor that emits a warning signal.