JP2604722Y2 - Friction pads for vehicle disc brakes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction pad for a disc brake used in various kinds of traveling vehicles, and more particularly to a structure of a friction pad which can be used for a long time.

[0002]

2. Description of the Related Art As a general friction pad used for a conventional vehicle disk brake, for example, Japanese Utility Model 3-12
There is one disclosed in Japanese Patent No. 991. The friction pad has a structure in which a lining is attached to one surface of a back plate, and is arranged on both sides of the disk rotor with the lining facing the disk rotor.

[0003]

However, the above-mentioned friction pad is replaced with a new friction pad when the lining is worn down to the limit of use, so that the life of the friction pad is short and the economy is poor. Was.

Accordingly, an object of the present invention is to provide an inexpensive friction pad having a simple structure and a long life.

[0005]

In order to achieve the above object, the present invention comprises a lining that slides on a side surface of a disk rotor, and a back plate that is held by a caliper body or a caliper bracket. The lining is provided on both sides of the back plate in a friction pad of a disc brake for a vehicle which is disposed to face the disc rotor and is pressed against the side surface of the disc rotor by a piston or a reaction force claw.
The piston and reaction claw directly abut on both sides of the back plate
It is characterized in that a pressed portion is provided .

[0006]

When the lining disposed on the disk rotor side is worn down to the limit of use, the friction pad is temporarily removed from the caliper body or the caliper bracket, the friction pad is turned over, and the lining on the side opposite to the disk rotor is replaced with the disk rotor side. Use both linings on both sides of the backing plate by reassembling the friction pad towards. The piston or the reaction force claw that pushes the friction pad directly abuts against the pressed portion other than the lining mounting portion of the back plate on the side opposite to the disk rotor, and these push the back plate.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The disc brake 1 for a motorcycle has an arrow A
A disc rotor 2 that rotates in a direction, a caliper body 7 that is supported outside of the rotor 2 by boss portions 4, 4 protruding from a front fork 3 via a pair of sliding pins 5, 6. It has a pair of friction pads 8, 8 arranged on both sides of the rotor 2 to face each other.

The caliper body 7 has a structure in which an operating portion 7a and a reaction portion 7b provided on both sides of the disk rotor 2 are connected by a bridge portion 7c straddling the outer periphery of the disk rotor 2. A cylinder hole 7d is provided, and a reaction force claw 7e extends from the reaction portion 7b. A piston 9 is inserted into the cylinder hole 7d so as to be liquid-tight and movable, and a hydraulic chamber 10 is defined at the bottom of the cylinder hole 7d.
On the opening side of the cylinder hole 7d, a pad holding hole 7f is formed with a larger diameter than the cylinder hole 7d, and while holding the friction pad 8 on the working portion side with the pad holding hole 7f,
It can be moved in the disk axis direction.

The reaction force claw 7e of the reaction portion 7b is provided with a pad holding hole 7g for holding the friction pad 8 on the reaction portion side and a piston insertion hole 7h for mounting the piston 9 in the cylinder hole 7d. Have been. The pad holding hole 7g is
It is formed to have substantially the same diameter as the pad holding hole 7f on the action portion 7a side,
The friction pad 8 is provided at the same depth as the thickness of the back plate 8a and is open to the disk rotor side. The piston insertion hole 7h is formed in such a size that the piston 9 can be inserted and removed, and the reaction force claw 7e has a ring shape due to the formation of the pad holding hole 7g and the piston insertion hole 7h.

Each friction pad 8 has a metal back plate 8a,
Two linings 8 attached to both sides of the back plate 8a
b, 8c, and the back plate 8a is formed in substantially the same circle as the pad holding holes 7f, 7g of the action portion 7a and the reaction portion 7b. The linings 8b and 8c are formed in a circular shape having a smaller diameter than the back plate 8a and slightly smaller than the inner diameter of the piston 9, and are bonded to both surfaces of the back plate 8a using an adhesive. Drilled binding hole 8
d are integrally connected. In this case, the back plate 8a
The lining is not applied to the ring-shaped portion corresponding to the outside of the linings 8b and 8c, and the inner peripheral side of the ring-shaped portion is not provided.
The piston 9 and Hanchikaratsume 7e is a pressed portion which contacts directly a pressing member of the friction pad 8.

The friction pad 8 on the working portion side is held by inserting the back plate 8a into the pad holding hole 7f, the lining 8c on the side opposite to the disk rotor is housed in the opening of the piston 9, and the back plate 8a is In the pressed part on the anti-disk rotor side,
The opening end surface of the piston 9 directly contacts. The friction pad 8 on the reaction portion side is held by inserting the back plate 8a into the pad holding hole 7g, the lining 8c on the side opposite to the disk rotor is accommodated in the piston insertion hole 7h, and the back plate 8a on the side opposite to the disk rotor. The bottom surface of the pad holding hole 7g directly contacts the pressed portion. On the working portion side, the back plate 8a and the pad holding hole 7f are set loosely so that the friction pad 8 can move in the disk axis direction. On the other hand, on the reaction portion side, the friction pad 8 is prevented from falling off. It is desirable that the back plate 8a and the pad holding hole 7g be set in an interference fit.

The disc brake 1 of this embodiment is constructed as described above. When the hydraulic fluid is supplied to the hydraulic chamber 10 by the braking operation, the piston 9 moves forward through the cylinder hole 7d, and The back plate 8a of the side friction pad 8 is directly pushed. As a result, the friction pad 8 is
While moving in the direction of the disk rotor while being guided by f, the lining 8b on the disk rotor side is brought into sliding contact with one side surface of the disk rotor 2. Also, the caliper body 7 slides in the direction of the acting portion while being guided by the sliding pins 5 and 6 due to the reaction force due to the sliding contact, and the reaction force claw 7 e directly contacts the back plate 8 a of the reaction portion side friction pad 8. When the friction pad 8 is pushed, the lining 8b of the friction pad 8 on the disk rotor side is brought into sliding contact with the other side surface of the disk rotor 2 to perform a braking action.

When the linings 8b, 8b on the disk rotor side are worn by a predetermined amount due to repeated braking, the sliding pins 5 on the inner peripheral side of the disk are removed and the sliding pins 6 on the outer peripheral side of the disk are supported. Then, the caliper body 7 is rotated outward of the disk rotor, and the friction pads 8, 8 are removed. Then, the back plates 8a, 8a are turned over, the linings 8c, 8c on the side opposite to the disk rotor are directed toward the disk rotor, respectively, and the friction pads 8, 8 are mounted on the caliper body 7 again. By rotating, the sliding pin 5 is attached to the boss 4.

As described above, the friction pad 8 of this embodiment is
Since the linings 8b and 8c are respectively attached to both surfaces of the back plate 8a on the disk rotor side and the opposite side of the disk rotor, even if one lining 8b is worn by a predetermined amount, the back plate 8a is turned over and the other lining 8c is mounted on the disk. By reattaching toward the rotor side, the friction pad 8 can be used for twice as long as the conventional case. Also,
Since the back plate 8a is shared by the two linings 8b and 8c, the unit price of the friction pad 8 can be reduced and the economic effect is high.

In the friction pad of the present invention, linings having different friction coefficients may be provided on both sides of the back plate. Also,
The shapes of the back plate, the lining, and the pad holding holes of the caliper body are not limited to the above-described embodiment, and may be, for example, the same horizontal rectangular shape as in the related art.

[0016]

[Effect of devised the present invention friction pad of, La on both sides of the back plate
In addition to providing innings, pistons and reaction
Since the pressed part to which the claw directly contacts is provided, one friction pad can be used until the linings on both sides of the back plate are worn by a predetermined amount, and the friction pad can be formed with a simple structure. It can be twice as long as the conventional one. Further, since the back plate is shared by two linings, the unit price of the friction pad can be reduced. In addition, by providing linings on both sides of the back plate, the thickness of the friction pad increases in the disk axis direction, but the piston and reaction force claw directly contact the back of the back plate. The length of the bridge portion of the body and the thickness of the reaction claw do not need to be increased in the disk axis direction, and can be easily arranged even in a limited installation space in the vehicle body. In addition, since the length of the bridge part and the thickness of the reaction force claw are suppressed, the required rigidity of the caliper body can be secured, and deformation can be applied to the braking reaction force from the friction pad and the drag torque in the disc ejection direction. It can be suppressed as much as possible. In addition, since the piston and reaction claw press against the rigid back plate, the pad pressing force of the piston and reaction claw does not need to be lost as much as possible, and the braking force set for the disc brake can be fully exhibited. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along a line II in FIG.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a front view of the disc brake attached to a front fork showing one embodiment of the present invention;

FIG. 4 is a rear view of the disc brake attached to a front fork showing one embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 7 ... Caliper body 7a ... Working part 7b ... Reaction part 7d ... Cylinder hole 7e ... Reaction force claw 7f ... Pad holding hole on the working part 7a side 7g ... Pad holding hole 7h on the reaction part 7b side ... Piston insertion hole 8 ... Friction pad 8a ... Back plate 8b, 8c ... Lining 9 ... Piston

Claims (1)

(57) [Scope of request for utility model registration] 1. A lining that slides on a side surface of a disk rotor, and a back plate held by a caliper body and a caliper bracket. In a friction pad of a vehicle disc brake pressed against the side surface of a rotor, the lining is provided on both sides of the back plate.
The piston and reaction claw directly abut on both sides of the back plate
A friction pad for a disc brake for a vehicle, comprising a pressed portion .