JPH08303493A - Pad spring for disc brake - Google Patents

Abstract

PURPOSE: To decrease dragging torque, and to improve attacking performance to an idling rotor without increasing the number of parts by performing preventing of slipping off of a pin and pressing of pads of an inner pad and an outer pad by means of a single pad spring. CONSTITUTION: A pad spring 30 presses and energizes pads 18, 22 to a perforated pin 26 while preventing the perforated pin 26 from slipping off from a caliper 10 and can forcibly return and move pads 18, 22 to the non braking position so that they may be separated from a rotor when it is moved from the braking state to the non braking state. Since a pad returning mechanism in a disc brake in which the inner pad 18 and the outer pad 22 are attached to the perforated pin 26 is achieved by the pad spring 30 formed of a single spring wire, generation of dragging torque is prevented, and attacking performance to an idling rotor can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake pad spring, and more particularly to a pad spring suitable for application to a disc brake in which inner pads and outer pads are attached by penetrating pins.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Publication No. 53-35654, as a disc brake, an outer pad and an inner pad are held in a state in which pins are penetrated, and these are held by a hydraulic cylinder and a caliper. It is known that a brake torque is generated by pressing the rotor through the rotor. In this type of disc brake, the caliper is moved and guided in the rotor axial direction by a slide guide pin mechanism with respect to a support that is a vehicle body fixing member, and the piston of the hydraulic cylinder presses the inner pad and the reaction force causes the caliper to move. Are moved in the opposite direction, pressing the outer pad against the rotor. The inner pad and the outer pad are attached to the caliper by penetrating pins so as to be movable in the rotor axial direction.

In the disc brake having the above structure, it is necessary to press the pair of pads against the penetrating pins to prevent the pads from vibrating and to prevent the penetrating pins from slipping out of the caliper. For this reason, a pad pressing spring has been conventionally provided. As disclosed in the above publication, this is constructed by attaching a pad pressing spring to each of the inner pad and the outer pad, and is formed so as to urge the pad outer edge portion toward the rotor center side with the through pin as a pressing fulcrum. There is.

[0004]

By the way, in this type of disc brake, the inner pad,
No mechanism was provided for forcibly returning and moving the outer pad in the direction away from the rotor. Therefore,
Even when the hydraulic cylinder is released from braking, the inner pad and outer pad are only held by the through pins, so the pads cannot be reliably moved away from the rotor, and drag torque and aggression against the idling rotor There was a disadvantageous structure in that there was such a thing. Also,
Conventional disc brakes have a structure with independent pad pressing springs for each of the inner pad and the outer pad, but this is to prevent the vibration of the pad with respect to the pad penetrating pin, so-called single-function structure. It was what was.

In the present invention, focusing on the above-mentioned conventional problems, both the inner pad and the outer pad can be moved back and at the same time, the pad pressing function and the pad penetrating pin retaining function are realized by one pad spring. It is an object of the present invention to provide a pad spring for a disc brake that can be used.

[0006]

In order to achieve the above object, a pad spring for a disc brake according to the present invention has a pair of pins extending in the axial direction of a rotor on an inner pad and an outer pad arranged with a rotor interposed therebetween. In a disc brake having a structure of penetrating and mounting, one spring wire is bent to form a pair of V-shaped spring portions that come into contact with the lower surface of the pin into a rhombic plane having symmetrical positions to form a wire intermediate portion. By engaging the connecting portions of both V-shaped spring portions with one of the pads on the outer end and the inner surface, and by engaging the tip of the wire with the outer end and the inner surface of the other pad, pad pressing force and pad return It is characterized in that the tip of the wire is passed through the pin to form a pin retaining portion while allowing the force.

[0007]

According to the above construction, in the pad spring, the pair of V-shaped spring portions perform an action of expanding the inner pad and the outer pad to move the pad back and at the same time.
The end portion of the V-shaped spring portion can push down the pad outer end surface toward the rotor center side with the through pin as the support surface. At the same time, since the tip of the spring wire serves as a retaining portion for the penetrating pin, it can be removed from the pad.
Such a function is configured by bending one spring wire, and one pad spring can realize three functions of pad pressing, pad returning movement, and pin removal prevention.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of a pad spring for a disc brake according to the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a plan view of a disc brake having a pad pad spring according to the embodiment and a front view seen from the outer side. The disc brake allows a caliper 10 (not shown) to move along a rotor axial direction via a pair of left and right parallel guide pins 14 with respect to a support 12 attached to a vehicle body. Caliper 1
A hydraulic cylinder 16 is provided on the inner side of 0, and thereby the inner pad 18 can be pressed against the rotor. Further, the outer pad 22 is pressed against the rotor by the outer side caliper claw 20 by the movement of the caliper 10 due to the reaction force of pressing from the inner pad 18. A pair of bolt through holes 24 are provided at a position near the center of the rotor on the inner side of the support 12, and are fixed to the vehicle body side by mounting bolts.

In addition to the above structure, the disc brake has a pair of pins 26R and 26L penetrating the inner pad 18 and the outer pad 22 so that the pads 18 and 22 can be translated. That is, a pair of penetrating pins 26 (26R, 26L) are inserted from the inner side or the outer side of the caliper 10 so as to be parallel to the rotor shaft at the outer position of the rotor, and this is arranged inside the caliper 10. The backing plates 18B and 22B of the pad 18 and the outer pad 22 are penetrated. As a result, when the piston of the hydraulic cylinder 16 is operated to press both pads 18 and 22 toward the rotor,
These move in parallel with the rotor and can generate a braking torque without a one-sided contact.

In such a disc brake structure, the pad spring 30 of the embodiment having the functions of pressing the pad against the inner pad 18 and the outer pad 22, returning the pad, and preventing the penetration pin 26 from coming off is attached. . This pad spring 30
Are assembled so that they are engaged with the outer end surfaces of the backing metal of the inner pad 18 and the outer pad 22 and abut on the lower surfaces of the pair of penetration pins 26. Therefore, first,
Inner pad 18 and outer pad 22 backing 18
At the zenith of B and 22B, the central protrusion 32C and the left and right protrusions 3
2L and 32R are formed, and these protrusions 32 (32C,
32L, 32R) as a fixed part, the pad spring 30
Can be assembled. The formation position of the protrusion 32 is the zenith of the backing plates 18B and 22B, but is set higher than the mounting position of the penetrating pin 26 in the rotor radial direction. These pads 18 and 22 and the through pin 2
The specific structure and the assembling structure of the pad spring 30 that is assembled with the pad spring 6 will be described with reference to FIG.

As shown in FIG. 1B, the pad spring 30 is formed by bending a single spring wire, and is bent so that its planar shape is substantially a rhombic shape. Symmetrical V-shaped spring part 3
4 (34R, 34L) are formed. The V corner 36 (36R, 3R, 3) of the pair of V-shaped spring portions 34
6L) is set to be larger than the distance between the through-pins 26, so that when the pad spring 30 is arranged in the intermediate portion of the pair of through-pins 26, the V-corner 3
Each of 6 is capable of slipping into the lower surface of the through pin 26.

A connecting portion 38 of both V-shaped spring portions 34, which is an intermediate portion of the spring wire, is engaged with a central protrusion 32C formed on a backing metal 18B of the inner pad 18, and at the same time, an inner surface of the inner pad 18 (a rotor facing portion). ) Can be contacted. Therefore, the left and right V-shaped spring portions 3
The pad pressing portion 38P is formed by continuously bending the tip end portions of the 4R and 34L adjacent to the inner pad 18 in a crank shape so that the side surface of the L-shaped portion is brought into contact with the inner surface of the inner pad 18. Have Also, the pad pressing portion 3
It is bent in a U-shape in the pad thickness direction between 8P and has a winding portion 38S around the central protrusion 32C of the inner pad 18, which allows the inner pad 18 to be assembled.

V extended to one outer pad 22 side
The ends of the U-shaped spring portion 34 are on the tip side of the spring wire, and the pair of tips are respectively engaged with the pair of left and right protrusions 32R and 32L formed on the top of the back pad of the outer pad 22, and the outer pad is also provided. It is possible to contact the inner surface of 22 (the surface facing the rotor). Therefore, each V
A pad pressing portion 40 (40R, 40L), which is bent from the end of the letter-spring portion 34 in the axial direction of the rotor and then bent in an L-shape along the radial direction of the rotor, is provided. The left and right protrusions 32R and 3R formed on the zenith of the back metal of the outer pad 22 are bent to
A winding portion 42 (42R, 42L) wound around 2L is formed. Each tip of the winding portion 42 is a wire end, which is further bent along the inner surface of the outer pad 22 and is inserted into a through hole formed in the pad penetrating pin 26 in the diametrical direction. Therefore, the pin insertion end functions as the pin retaining portion 44 (44R, 44L).

By bending one spring wire in this manner, a pair of symmetrical V-shaped spring portions 34,
Abutment engagement parts (38P, 38S, 4
0, 42) and a pin removal preventing portion 44 are formed.
In such a pad spring 30, as shown in FIG. 1 (1), the pin disengagement prevention portion 44 is inserted into each pad penetrating pin 26, and the V corner 36 of the V-shaped spring portion 32 is made to go under the penetrating pin 26. The corresponding winding portions 38S and 42 are fitted into the protrusions 32 formed on the back metal of the pad to complete the assembling to the pads 18 and 22. In this case, since the distance between the inner pad 18 and the outer pad 22 becomes smaller when braking is performed,
Since the gap between the V-shaped spring portions 32 is reduced via the pad pressing portions 38P and 40, the V-shaped spring portions 32 return to their original shape when the braking is released. As a result, the pads 18 and 22 are moved back. Therefore, the V-shaped spring portion 32 is set in its expanded shape so as to define the pad distance when the brake is not applied. In addition, the V corner 36 of the V-shaped spring portion 32
And the height dimension (deviation in the rotor radial direction) of the winding portions 38S, 42 is made smaller than the height dimension (deviation in the rotor radial direction) between the penetrating pin 26 and the protrusion 32 of the pads 18, 22. , 22 and the penetration pin 26 are absorbed.

The pad spring 3 thus constructed
0 prevents the penetrating pin 26 from slipping out of the caliper 10, presses and urges the pads 18 and 22 against the penetrating pin 26, and when the braking state changes to the non-braking state, the pads 18 and 22 are removed from the rotor. It can be forcibly returned to the non-braking position so as to be separated. For this reason, the pad returning function of the disc brake in which the inner pad 18 and the outer pad 22 are attached to the penetrating pin 26 is achieved by the pad spring 30 formed by one spring wire, so that in this type of disc brake. It is possible to prevent the generation of drag torque, which has been a problem, and to improve the aggressiveness of the idling rotor.

[0017]

As described above, according to the present invention,
In a disc brake equipped with a pad penetrating pin, it is possible to prevent the pin from coming off and hold the inner and outer pads with a single pad spring, and forcibly return both pads to a non-braking position. Therefore, it is possible to obtain the excellent effects that the drag torque can be reduced and the aggression to the idling rotor can be improved without increasing the number of parts.

[Brief description of drawings]

FIG. 1 is a perspective view of a pad spring according to an embodiment assembled to a pad and a perspective view of the pad spring.

FIG. 2 is a plan view and a front view of a disc brake equipped with a pad spring according to an embodiment.

[Explanation of symbols]

 10 Caliper 12 Support 14 Guide Pin 16 Hydraulic Cylinder 18 Inner Pad 18B Back Metal 20 Caliper Claw 22 Outer Pad 22B Back Metal 24 Bolt Through Hole 26 (26R, 26L) Pad Penetration Pin 30 Pad Spring 32 (32C, 32L, 32R) Protrusion 34 ( 34R, 34L) V-shaped spring part 36 (36R, 36L) V-corner 38 Connection part 38P Pad pressing part 38S Winding part 40 (40R, 40L) Pad pressing part 42 (42R, 42L) Winding part 44 (44R, 44L) Pin Retaining part

Claims (1)

[Claims] 1. A disc brake having a structure in which a pair of pins extending in the axial direction of a rotor are attached to an inner pad and an outer pad that sandwich the rotor, and the pair is formed by bending one spring wire. A pair of V-shaped spring portions that come into contact with the lower surface of the pin are formed into a substantially flat diamond shape, and the connecting portions of both V-shaped spring portions that are wire intermediate portions are engaged with one outer end and one inner surface of the pad, By engaging the wire tip with the outer end and the inner surface of the other pad to enable the pad pressing force and the pad returning force, the wire tip is passed through the pin to form a pin retaining portion. Pad spring for disc brake.