JPH08254234A - Disc brake for vehicle - Google Patents

Abstract

PURPOSE: To effectively separate a frictional pad during a braking releasing period from a disc rotor so as to prevent the drag of a lining. CONSTITUTION: A second piston 12 is liquid-tightly and movably inserted on the antidisc rotor side of the cylinder hole 10 of a fixed body 6 through a corner seal 14. The piston receiving part 7a of a movable body 7 is arranged on the antidisc rotor side of the cylinder hole 10. The piston receiving part 7a and the second piston 12 are integrally connected to each other by connecting means such as a connecting bolt 20, welding and a clip and, when braking is canceled, the movable body 7 can be slid in the direction of a pad pushing/pressing part 7b by the restoring force of the corner seal 14 so that the pad pushing/pressing part 7b can be separated from the back surface of the back plate 4b of the other frictional pad 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake used in a traveling vehicle such as an automobile or a motorcycle, and more specifically, a caliper body used in the disc brake is fixed to a vehicle body. The present invention relates to a vehicle disc brake having a structure in which a movable body slidably supported by the fixed body is combined.

[0002]

2. Description of the Related Art As a vehicle disk brake, for example, there is one disclosed in Japanese Patent Publication No. 5-24369. This disc brake has a cylinder body fixed to the vehicle body at one side of the disc rotor, and a movable body slidably supported by the fixed body in the disc axial direction via a pair of slide pins. Then, the first piston and the second piston, which are pushed in opposite directions with the hydraulic chamber sandwiched, are inserted into a cylinder hole formed through the fixed body in the axial direction of the disk.
A piston and a piston receiving portion, which is liquid-tightly and movably inserted through the corner seals, respectively, and at both ends of the movable body, which covers the side opposite to the disk rotor of the cylinder hole,
A pad pressing portion that covers the back surface of the other friction pad disposed on the other side of the disk rotor is provided, and the boosted hydraulic fluid is supplied to the hydraulic chamber, and the first piston on the disk rotor side The friction pad is pressed against one side surface of the disk rotor, the piston receiving portion is pressed by the second piston on the side opposite to the disk rotor, the movable body is slid toward the fixed body, and the pad pressing portion frictions the other side. The pad is pressed against the other side surface of the disc rotor to perform a braking action.

[0003]

In such a structure, the first and second hydraulic fluids are supplied to the hydraulic chamber by supplying the boosted hydraulic fluid.
At the time of braking by pushing the piston, each angular seal elastically deforms with the movement of the piston, and at the time of braking release after the supply of hydraulic fluid to the hydraulic chamber is released, each piston is caused by the restoring force of the angular seal. It is designed to be pulled back toward the hydraulic chamber. As a result, in one of the friction pads, when the first piston retracts, a gap is formed between the first piston and the first piston, and the one friction pad separates from one side surface of the disc rotor, but in the other friction pad, the movable body moves. Has a problem in that the pad pressing portion of the movable body does not separate from the back surface of the other friction pad and the lining is dragged to the disk rotor, because the vehicle stops while sliding toward the piston receiving portion during braking.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disc brake for a vehicle in which both friction pads are effectively separated from the disc rotor at the time of releasing the brake, and the drag of the lining can be prevented.

[0005]

According to the present invention, in accordance with the above-mentioned object, a pair of friction pads are provided on opposite sides of a disk rotor so as to face each other, and a fixed body fixed to a vehicle body at one side of the disk rotor is provided. A caliper body is configured by supporting a movable body that is disposed across the outside of the disc rotor so as to be slidable in the disc axial direction via a pair of slide pins.
A first piston and a second piston, which are pushed in opposite directions with the hydraulic chamber interposed, are respectively inserted into cylinder holes in the disk axial direction which are formed through the fixed body by opening to the back surface of one of the friction pads. Liquid-tightly and movably inserted through an angle seal, and a piston receiving portion that covers the opposite side of the cylinder hole from the disk rotor side at the both ends of the movable body and the other friction disposed on the other side portion of the disk rotor. A pad pressing portion for covering the back surface of the pad is provided, and one friction pad is pressed against one side surface of the disk rotor by the first piston on the disk rotor side, and the piston receiving portion by the second piston on the side opposite to the disk rotor. To move the movable body toward the piston receiving portion, and the pad pressing portion presses the other friction pad to the other side surface of the disk rotor to perform braking. In the caliper body of the disk brake is characterized in that integrally connected to the second piston and the piston receiving portion of the movable body at the connecting bolts, welding, or the like connecting means.

[0006]

According to this structure, the second piston and the movable body operate integrally to release the supply of the hydraulic fluid to the hydraulic chamber,
When the second piston retracts toward the hydraulic chamber due to the restoring force of the angular seal, the movable body integrated with the second piston slides toward the pad pressing portion, and the pad pressing portion separates from the back surface of the other friction pad. The other friction pad can be effectively separated from the other side surface of the disc rotor by the amount of the gap between the friction pad and the pad pressing portion due to the competition with the disc rotor.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

The disc brake 1 comprises a disc rotor 2 which rotates integrally with a wheel (not shown) in the direction of arrow A, a pair of friction pads 3 and 4 arranged on opposite sides of the disc rotor 2, and both friction pads 3, 4. 4 linings 3a, 4
It has a caliper body 5 that presses a toward both side surfaces of the disc rotor 2.

The caliper body 5 supports a movable body 7 on a fixed body 6 fixed to the vehicle body at one side of the disc rotor 2 via a pair of slide pins 8 so as to be movable in the disc axial direction. It is composed of both friction pads 3, 4
Is hung movably in the disc axial direction by inserting a hanger pin 9 spanning the outer side of the disc rotor 2 and spanning the fixed body 6 and the movable body 7 into the upper portions of the back plates 3b and 4b. .

A cylinder hole 10 penetrating in the disc axial direction is provided in the fixed body 6 so as to open to the back surface of one of the friction pads 3, a vehicle body mounting portion 6a is provided on the inner peripheral side of the disc, and a disc entry side is provided. And a pair of connecting arms 6 on both sides of the feeding side
b and 6b are respectively projectingly provided, and both connecting arms 6b and 6b
Slide pins 8 are provided at the tip of 6b so as to project in the direction opposite to the disk. In the cylinder hole 10, the first piston 1
The first and second pistons 12 are liquid-tightly and movably inserted through the corner seals 13 and 14 and the dust seals 15 and 16, and the hydraulic chamber 17 is defined between the pistons 11 and 12.
A union hole 18 for introducing the hydraulic fluid is provided in the.

The movable body 7 has a piston receiving portion 7a which covers the opposite side of the cylinder hole 10 on the side opposite to the disk rotor in the disk circumferential direction, and a back surface of the back plate 4b of the other friction pad 4 which projects toward the disk center. A bridge portion 7 that straddles the pad pressing portion 7b across the outer periphery of the disc rotor 2 with the friction pads 3 and 4 and the fixed body 6 sandwiching the disc entry side and the entry side.
c and 7c are integrally connected. Bag-shaped pin holes 19 and 19 are provided at the connecting portion between the piston receiving portion 7a and the bridge portions 7c and 7c so as to open toward the disc rotor side, and the movable body 7 is provided in the pin holes 19 respectively. The slide pin 8 is inserted and supported so as to be movable in the disc axial direction.

The second piston 12 is connected to the piston receiving portion 7a of the movable body 7 by a connecting bolt 20.
The piston 12 and the movable body 7 are moved integrally. A tool hooking hole 12a is formed on the inner surface of the second piston 12.
When the second piston 12 and the movable body 7 are bolted together, a tool is inserted into the tool engaging hole 12a to regulate the rotation of the second piston 12, so that the connection work can be performed well. I am trying to do it.

In this embodiment having such a structure, the hydraulic fluid whose pressure is increased by the braking operation of the driver is applied to the union hole 18
When the first piston 11 elastically deforms the angular seal 13 and moves the cylinder hole 10 toward the disc rotor, the one friction pad 3 is pushed, and the friction pad 3 is supplied. The lining 3a is pressed against one side surface of the disc rotor 2. Further, the second piston 12 moves the cylinder hole 10 to the opposite disk rotor while elastically deforming the corner seal 14, and the movable body 7 integrated with the second piston 12 is moved.
Also slides toward the piston receiving portion 7a, and the pad pressing portion 7b pushes the other friction pad 4,
The lining 4a is pressed against the other side surface of the disc rotor 2 to perform a braking action.

Next, when the above braking operation is released, the first
The piston 11 and the second piston 12 are pulled back toward the hydraulic chamber by the restoring force of the respective corner seals 13 and 14, and the movable body 7 integrated with the second piston 12 also slides toward the pad pressing portion 7b and is not moved. Return to operating position. As a result, not only between the one friction pad 3 and the first piston 11, but also the pad pressing portion 7b of the movable body 7 recedes from the back plate 4b of the other friction pad 4 and a gap is formed on the back surface of the back plate 4b. Since it is set, the other friction pad 4 can be effectively separated from the disc rotor 2 by a bid with the disc rotor 2 like the one friction pad 3, and the problem of dragging the lining 4a is solved. To be done.

As another connecting means between the second piston and the pad receiving portion of the movable body, a screw may be provided on the second piston so as to be directly screwed to the pad receiving portion, or welding or loosening may be performed. You may connect with a clip or a split pin which does not accompany.

[0016]

In the vehicular disc brake of the present invention, the caliper body is slidable in the disc axial direction on the fixed body fixed to the vehicle body at one side of the disc rotor by the pair of slide pins. The fixed body is provided so as to cover the piston receiving portion of the movable body on the side opposite to the disc rotor of the cylinder hole formed through the fixed body in the disc axial direction. The second piston, which is inserted on the disc rotor side through the square seal, is integrally connected by a connecting means such as a connecting bolt or welding, so that when the braking is released, the second piston is liquid by the restoring force of the square seal. When retracting in the direction of the pressure chamber, the movable body integrated with the second piston slides toward the pad pressing portion, and the pad pressing portion separates from the back surface of the other friction pad, so that the other friction pad The auction with Isukurota, becomes the gap portion of the pad pressing portion to be effectively separated from the other side of the disc rotor, disadvantageously 引摺Ru the lining is eliminated.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG.

FIG. 2 is a front view of a disc brake showing an embodiment of the present invention.

FIG. 3 is a partial cross-sectional plan view of a disc brake showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3,4 ... Friction pad 3a, 4a ... Lining 3b, 4b ... Back plate 5 ... Caliper body 6 consisting of fixed body 6 and movable body 7 ... Fixed body 7 ... Movable body 7a ... Piston Receiving part 7b ... Pad pressing part 7c ... Bridge part 8 ... Slide pin 10 ... Cylinder hole penetrating in the disc axial direction 11 ... First piston 12 ... Second piston 13, 14 ... Square seal 15, 16 ... Dust seal 17 ... Hydraulic pressure Chamber 18 ... Union hole 19 ... Pin hole 20 ... Connecting bolt A ... Rotation direction of disk rotor 2

Claims (1)

[Claims] 1. A movable body, which is provided with a pair of friction pads facing each other on both sides of a disk rotor, and is fixed to a vehicle body at one side of the disk rotor so as to straddle the outside of the disk rotor. The body is supported by a pair of slide pins so as to be slidable in the disc axial direction to form a caliper body. , A first piston and a second piston, which are pushed in opposite directions with the hydraulic chamber sandwiched therebetween, are liquid-tightly and movably inserted through respective corner seals, and the cylinder holes are provided at both ends of the movable body. A piston receiving portion that covers the side opposite to the disk rotor and a pad pressing portion that covers the back surface of the other friction pad arranged on the other side of the disk rotor are provided.
While pressing one friction pad with one side of the disc rotor by the piston, the piston receiving portion is pushed by the second piston on the side opposite to the disc rotor, and the movable body is slid toward the piston receiving portion. In the caliper body of the vehicle disc brake, in which the other friction pad is pressed against the other side surface of the disc rotor by the pad pushing portion to provide a braking action, the piston receiving portion of the movable body and the second
A disc brake for a vehicle, which is integrally connected to a piston by a connecting means such as a connecting bolt or welding.