WO2010137715A1

WO2010137715A1 - Disc brake for vehicles

Info

Publication number: WO2010137715A1
Application number: PCT/JP2010/059158
Authority: WO
Inventors: 弦一波多腰
Original assignee: 日信工業株式会社
Priority date: 2009-05-29
Filing date: 2010-05-28
Publication date: 2010-12-02
Also published as: JP5112384B2; CN102428291A; JP2010276129A; TWI386334B; TW201103790A

Abstract

Provided is a disc brake for vehicles, said disc brake having a simple structure, being capable of reliably preventing uneven wear of friction pads, and allowing lighter friction pads. A pair of friction pads (6, 6) each provided with a lining having a contact surface are disposed opposite each other on both sides of a brake disc (2), between an action part (5a) and a reaction part (5b) of a caliper body (5) disposed straddling the periphery of the brake disc (2). For the contact surface of the friction pad (6) on the side of the action part (5a), the trailing edge with respect to the brake disc is formed smaller than the leading edge, and for the contact surface of the friction pad (6) on the side of the reaction part (5b), the leading edge with respect to the brake disc is formed smaller than the trailing edge, thereby achieving the abovementioned goal.

Description

Vehicle disc brake

The present invention relates to a vehicle disc brake in which a pin slide type caliper body is supported by a vehicle suspension device such as a front fork, and more specifically, a disc rotor is disposed between an action portion and a reaction portion of a caliper body. Relates to the structure of the friction pad.

Conventionally, a pin slide type vehicle disc brake in which a caliper body is slidably supported by a vehicle suspension such as a front fork is known. In such a vehicle disc brake, the braking torque generated from the friction pad during braking is supported by a torque receiving surface on the disc rotor delivery side provided in the vehicle suspension device. At the time of braking, the friction pad is unevenly worn because the disk rotor entrance side of the friction pad is strongly pressed against the disk rotor. Therefore, there is known a vehicle disc brake in which the center of the lining of the friction pad is shifted to the disc rotor retraction side with respect to the pressing center of the piston (for example, see Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-110859

In the pin slide type caliper body, when braking torque is received from the friction pad on the torque receiving surface provided in the vehicle suspension system, the couple force generated in the caliper body and the clamping force sandwiching the disc rotor There was an area where the surface pressure acting on the lining increased. In particular, when the caliper body is displaced with respect to the disc rotor due to a couple of forces generated in the caliper body during braking, the lining on the action portion side is strongly pressed against the disc rotor and the lining on the reaction portion side is rotated on the disc rotor. The exit side is strongly pressed against the disc rotor. For this reason, the area of the lining in which the surface pressure increases is different between the lining on the action part side and the lining on the reaction part side.

For this reason, even if the center of the lining of the friction pad is shifted to the disk rotor entrance side with respect to the pressing center of the piston as in the above-mentioned Patent Document 1, the uneven wear of the friction pad cannot be reliably suppressed. It was.

Therefore, an object of the present invention is to provide a vehicle disc brake that can reliably prevent uneven wear of the friction pad with a simple structure and can further reduce the weight of the friction pad.

According to the present invention, the following is provided to realize the above object.
(1) a disc rotor;
A caliper having an action part, a reaction part disposed opposite to the action part via the disk rotor, and a bridge part connecting the action part and the reaction part across the outer periphery of the disk rotor A vehicle disc brake having a body,
Each of the action part and the reaction part has an action part side friction pad and a reaction part side friction pad facing each other via the disk rotor,
Each of the action part side friction pad and the reaction part side friction pad has a lining having a contact surface in contact with the disk rotor,
A disk brake for a vehicle, wherein a shape of the contact surface of the action part side friction pad and the contact surface of the reaction part side friction pad sandwiching the disk rotor is non-specular.
(2) The contact surface of the working part side friction pad is smaller in the disk rotor outlet side when the vehicle moves forward than the disk rotor inlet side,
(1) The vehicle disc brake according to (1), wherein the contact surface of the reaction portion side friction pad is smaller in the disc rotor turn-in side than in the disc rotor feed-out side.
(3) The vehicle according to (2), wherein the contact surface of the working part side friction pad and the contact surface of the reaction part side friction pad are smaller on the inner side in the radial direction of the disk rotor than on the outer side. Disc brake for use.
(4) The action part side friction pad and the reaction part side friction pad have the same shape,
(1) to (3) for a vehicle according to any one of (1) to (3), characterized in that each of the contact surfaces is arranged on both sides of the disk rotor so that the shape sandwiching the disk rotor is non-specular. Disc brake.

According to the vehicle disc brake of the present invention, the shape of the contact surface of the action part side friction pad and the contact surface of the reaction part side friction pad sandwiching the disk rotor is non-specular. Even if the friction pads on the action part side and the reaction part side have different areas where the surface pressure of the lining increases during braking, uneven wear of the lining can be reliably prevented.

Further, according to the vehicle disc brake of the present invention, the contact surface of the action portion side friction pad is smaller on the disc rotor return side when the vehicle moves forward than the disc rotor return side, and the reaction portion side friction pad The contact surface is smaller on the disk rotor return side than on the disk rotor return side. Therefore, due to a couple of forces generated in the caliper body during braking, the disc rotor delivery side of the caliper body is shifted to the opposite disc rotor side, the disc rotor introduction side is shifted to the disc rotor side, and the disc rotor introduction side of the lining on the working side is Even if the disk rotor is strongly pressed against the disk rotor and the disk rotor outlet side of the lining on the reaction part side is strongly pressed against the disk rotor, uneven wear of the lining can be prevented. Furthermore, it is possible to reduce the lining of the area where no surface pressure is applied during braking, and to reduce the weight of the friction pad.

According to the vehicle disc brake of the present invention, the contact surface of the action portion side friction pad and the contact surface of the reaction portion side friction pad are smaller on the inner side in the radial direction of the disc rotor than on the outer side. . Therefore, even when the surface pressure on the radially outer side of the disk rotor of the lining increases due to the clamping force of the friction pad sandwiching the disk rotor during braking, uneven wear of the lining can be prevented and the friction pad can be reduced in weight. be able to.

Furthermore, in the vehicle disc brake of the present invention, the action part side friction pad and the reaction part side friction pad have the same shape, and the shapes of the contact surfaces sandwiching the disk rotor are non-specular. Further, they are arranged on both sides of the disk rotor. Therefore, a vehicle disc brake capable of preventing uneven wear can be easily realized at low cost using a pair of friction pads having the same shape.

It is II sectional drawing of FIG. It is II-II sectional drawing of FIG. It is III-III sectional drawing of FIG. 1 is a front view of a vehicle disc brake showing an embodiment of the present invention.

A vehicle disc brake 1 according to an embodiment of the present invention described below is a pin slide type disc brake mounted on a bar handle vehicle such as a motorcycle.

As shown in FIGS. 1 to 4, a vehicle disc brake 1 includes a disc rotor 2 that rotates integrally with a wheel (not shown), and a front fork (not shown) that is a vehicle suspension device at one side of the disc rotor 2. ) And a pair of slide pin mounting portions 3, 3 provided integrally with each other, and supported by the slide pin mounting portions 3, 3 so as to be slidable in the axial direction of the disk rotor 2 via the pair of slide pins 4, 4. A caliper body 5 and a pair of

friction pads

6 and 6 disposed opposite to each other with the disk rotor 2 interposed between an action portion 5a and a reaction portion 5b of the caliper body 5 are provided.

Note that arrows A in FIGS. 1, 2 and 4 indicate the rotation direction of the disc rotor 2 when the vehicle is traveling forward. The disk rotor introduction side used in the following description is the side where the rotating disk rotor 2 approaches the caliper body 5 among both sides in the circumferential direction of the caliper body 5 arranged on the circumference of the disk rotor 2. For example, the right side of FIG. The disk rotor delivery side is the other side in the circumferential direction of the caliper body 5, and is the side where the rotating disk rotor 2 moves away from the caliper body 5, for example, the left side of FIG. Further, the radial direction and the circumferential direction referred to below refer to the radial direction and the circumferential direction of the disc rotor 2 unless otherwise specified.

The slide pins 4 and 4 are provided so as to protrude from a pair of slide pin mounting portions 3 and 3 provided integrally with the front fork. These slide pins 4 and 4 are respectively inserted into guide holes 5j and 5k provided in slide

pin support portions

5e and 5e of the caliper body 5 to be described later, and the caliper body 5 is slidable in the axial direction of the disc rotor 2. It is supported by the front fork.

The caliper body 5 connects the action part 5, the reaction part 5 b opposed to the action part 5 a via the disk rotor 2, and the action part 5 a and the reaction part 5 b across the outer periphery of the disk rotor 2. And a bridge portion 5c. The action part 5a is provided with a cylinder hole 5d and a pair of slide

pin support parts

5e, 5e, and the reaction part 5b is provided with a reaction force claw 5f.

At the approximate center of the action part 5a of the caliper body 5, a bottomed cylindrical cylinder hole 5d is provided so as to open to the disk rotor 2 side. A cup-shaped piston 9 is inserted into the cylinder hole 5d in a liquid-tight manner using an O-ring or the like, and a hydraulic chamber 10 is defined between the piston 9 and the bottom of the cylinder hole 5d.

A rectangular ceiling opening 5g is formed at substantially the center of the bridge portion 5c so as to penetrate inside and outside in the radial direction. Mounting

step portions

5h, 5h are formed on the disk rotor return side and the disk rotor return side of the ceiling opening 5g. A torque receiving surface 5i for supporting a braking torque is formed on the mounting step portion 5h on the disk rotor delivery side so as to face a contact surface 6g of a friction pad 6 described later.

As shown in FIGS. 1 and 2, the pair of slide

pin support portions

5 e and 5 e provided on the caliper body 5 are respectively provided on the disk rotor delivery side and the radial inner side of the disk rotor 2 with respect to the cylinder hole 5 d. The caliper body 5 is slidably supported by the slide pins 4 and 4 by inserting the slide pins 4 and 4 into the guide holes 5j and 5k of the slide

pin support portions

5e and 5e.

The slide pin support part 5e provided on the disk rotor delivery side is provided so as to extend in the axial direction of the disk rotor 2 from the action part 5a side to the reaction part 5b side. The slide pin support portion 5e on the disk rotor delivery side is formed with a guide hole 5j that opens to the action portion 5a side. Further, the surface on the friction pad 6 side of the slide pin support portion 5e is the above-described torque receiving surface 5i.
A guide hole 5k shorter than the guide hole 5j of the slide pin support portion 5e provided on the disk rotor delivery side passes through the slide pin support portion 5e provided on the radially inner side of the disk rotor 2 in the axial direction of the disk rotor 2. Is formed.

Also, the action part 5a and the reaction part 5b of the caliper body 5 have a pair of friction pads (action part side friction pad and reaction part side friction pad) 6 and 6 that face each other via the disk rotor 2. The friction pad 6 includes a lining 6a having a contact surface that comes into contact with the disk rotor 2, and a metal back plate 6b joined to the lining 6a. The

friction pads

6 and 6 are formed in the same shape.

Referring to FIGS. 1 and 2, the back plate 6 b of the friction pad 6 has a substantially rectangular shape, and the side surfaces located at both ends in the circumferential direction of the disk rotor 2 are opposed to the torque receiving surfaces 5 i of the caliper body 5. A contact surface 6g is formed. The back plate 6b is provided with a hanger pin insertion portion 6d provided with a hanger pin insertion hole 6c at the center on the outer side in the radial direction so as to protrude outward in the radial direction. In addition, an ear piece 6 e protruding in the circumferential direction of the disk rotor 2 is provided on the outer side in the radial direction of the contact surface 6 g, and the ear piece 6 e is hooked on the mounting step portion 5 h of the caliper body 5.

The hanger pin insertion hole 6 c of the friction pad 6 is inserted with a hanger pin 7 that passes through the ceiling opening 5 g and spans between the action portion 5 a and the reaction portion 5 b, and the friction pad 6 extends in the axial direction of the disk rotor 2. The hanger pin 7 is slidably suspended. Further, the ear piece 6e of the friction pad 6 is hooked on the mounting step portion 5h of the caliper body 5, and the friction pad 6 is prevented from largely swinging around the hanger pin insertion hole 6c. Further, a biasing force is applied so that the friction pad 6 is always located at a fixed position by the pad spring 8 that contacts the side surface of the hanger pin insertion portion 6d, and rattling of the friction pad 6 is prevented.

As shown in FIG. 1, the contact surface of the friction pad 6 on the action portion 5a side is formed with the radially inner side 6f inclined so that the radial dimension gradually decreases toward the disk rotor delivery side. . On the other hand, as shown in FIG. 2, the contact surface of the friction pad 6 on the reaction portion 5b side is formed with the radially inner side 6f inclined so that the dimension in the radial direction gradually decreases toward the disk rotor entrance side. ing. As described above, the contact surface of the friction pad 6 on the action portion 5a side is smaller on the disk rotor return side than the disk rotor return side, and the contact surface of the friction pad 6 on the reaction portion 5b side is on the disk rotor turn side. Smaller than the exit side.

Further, both the contact surface of the friction pad 6 on the action part side 5a and the contact surface of the friction pad 6 on the reaction part side 5b are formed with only the radially inner side 6f inclined, and the radially outer side is substantially linear. Since it is formed, the contact surface of any friction pad 6 is smaller on the inner side in the radial direction than on the outer side.

1 and 2, the contact surface of the friction pad 6 on the action portion 5a side and the contact surface of the friction pad 6 on the reaction portion 5b side are paired so that the shape sandwiching the disk rotor 2 is non-specular. The

friction pads

6 and 6 are arranged. That is, on the disk rotor entry side, the large area of the contact surface of the friction pad 6 on the action part 5 a side faces the small area of the contact surface of the friction pad 6 on the reaction part 5 b side via the disk rotor 2. . On the disk rotor delivery side, a small area of the contact surface of the friction pad 6 on the action part 5 a side faces a large area of the contact surface of the friction pad 6 on the reaction part 5 b side via the disk rotor 2. .

When the driver performs a braking operation, the vehicle disc brake 1 formed as described above is supplied with hydraulic fluid that has been pressurized by a hydraulic master cylinder (not shown) to the hydraulic chamber 10. The hydraulic fluid supplied to the hydraulic chamber 10 presses the piston 9 toward the disk rotor 2, and the piston 9 brings the contact surface of the friction pad 6 on the action portion 5 a side into contact with one side surface of the disk rotor 2. Further, since the hydraulic fluid supplied to the hydraulic chamber 10 presses the caliper body 5 toward the action part 5a, the reaction force claw 5f provided on the reaction part 5b causes the contact surface of the friction pad 6 on the reaction part 5b side. The disk rotor 2 is brought into contact with the other side. When the contact surfaces of the pair of

friction pads

6, 6 contact the disk rotor 2, the contact surfaces 6 g, 6 g of the

friction pads

6, 6 contact the pair of

torque receiving surfaces

5 i, 5 i of the caliper body 5, and the caliper body 5 Supports the braking torque acting on the

friction pads

6, 6. In this way, the vehicle disc brake 1 generates a braking force.

At this time, the

friction pads

6 and 6 are dragged toward the disc rotor delivery side, and the disc rotor delivery side surface 6g of the back plate 6b contacts the torque receiving surface 5i of the slide pin support portion 5e. As a result, a couple of forces is generated in the caliper body 5, and the disk rotor delivery side of the caliper body 5 is shifted to the opposite disk rotor side, and the disk rotor delivery side is shifted to the disk rotor side. As a result, the disk rotor turn-in side of the lining 6a on the action part side is strongly pressed against the disk rotor 2, and the disk rotor turn-out side of the lining 6a on the reaction part side is strongly pressed against the disk rotor 2.

However, as shown in FIGS. 1 and 2, according to the vehicle disc brake 1 according to the present embodiment, the contact surface of the friction pad 6 on the acting portion 5 a side is smaller on the disc rotor delivery side than on the disc rotor delivery side. The contact surface of the friction pad 6 on the reaction portion 5b side is formed so that the disk rotor return side is smaller than the disk rotor return side. Thus, the

friction pads

6 and 6 are formed so that the contact area of the region strongly pressed against the disk rotor 2 is large, so that the surface pressure per unit area of the

linings

6a and 6a becomes uniform, and therefore the

linings

6a and 6a. It is possible to prevent uneven wear.

Further, even if the disc rotor outer peripheral side of the

linings

6a, 6a is strongly pressed against the disc rotor 2 by the clamping force with the

friction pads

6, 6 sandwiching the disc rotor 2 during braking, uneven wear of the

linings

6a, 6a can be prevented. . Both the contact surface of the friction pad 6 on the action portion 5a side and the contact surface of the friction pad 6 on the reaction portion 5b side are larger in the radial direction than the outside, and the contact area of the region pressed strongly against the disc rotor 2 is large. This is because the surface pressure per unit area of the

linings

6a and 6a is uniform because they are formed large.

Also, since the area where no surface pressure is applied during braking of the

linings

6a, 6a is reduced, the weight of the

friction pads

6, 6 can be reduced.

In addition, according to the vehicle disc brake 1 according to the present embodiment, a pair of

friction pads

6 and 6 having the same shape are arranged to face each other via the disc rotor 2 with one friction pad 6 inverted, and friction is applied. The contact surfaces of the

pads

6 and 6 are arranged so as not to be mirror-symmetric with respect to the disk rotor 2. In other words, a region where the radial dimension of the contact surface of one friction pad 6 is small and a region where the radial dimension of the contact surface of the other friction pad 6 is large are arranged to face each other with the disc rotor 2 therebetween. ing. Therefore, the vehicle disc brake 1 that can prevent the above-described uneven wear can be easily realized at low cost by using the pair of

friction pads

6 and 6 having the same shape.

In addition, this invention is not restricted to the above-mentioned example, It can apply also to the disc brake with which the caliper body 5 was attached to the vehicle suspension apparatus via the bracket. Further, the friction pad 6 on the action part 5a side and the friction pad 6 on the reaction part 5b side may have different shapes.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application filed on May 29, 2009 (Japanese Patent Application No. 2009-130173), the contents of which are incorporated herein by reference.

Claims

A disk rotor,
A caliper having an action part, a reaction part disposed opposite to the action part via the disk rotor, and a bridge part connecting the action part and the reaction part across the outer periphery of the disk rotor A vehicle disc brake having a body,
Each of the action part and the reaction part has an action part side friction pad and a reaction part side friction pad facing each other via the disk rotor,
Each of the action part side friction pad and the reaction part side friction pad has a lining having a contact surface in contact with the disk rotor,
A disk brake for a vehicle, wherein a shape of the contact surface of the action part side friction pad and the contact surface of the reaction part side friction pad sandwiching the disk rotor is non-specular.
The contact surface of the working part side friction pad has a smaller disk rotor outlet side than the disk rotor inlet side when the vehicle moves forward,
2. The disc brake for a vehicle according to claim 1, wherein the contact surface of the reaction part side friction pad is smaller on the disk rotor return side than on the disk rotor return side.
3. The vehicle disk according to claim 2, wherein the contact surface of the action part side friction pad and the contact surface of the reaction part side friction pad are smaller on the inner side in the radial direction of the disk rotor than on the outer side. brake.
The action part side friction pad and the reaction part side friction pad have the same shape,
The vehicle according to any one of claims 1 to 3, wherein each of the contact surfaces is disposed on both sides of the disk rotor so that a shape sandwiching the disk rotor is non-specular. Disc brake for use.