JP2002250376A - Disc brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress the generation of a clonking sound without adversely affecting dragging torque at the time of non-braking and without increasing the number of parts in a disc brake for a vehicle. SOLUTION: In this disc brake for the vehicle constituted by interposing pad clips 40 and 50 among rotor peripheral direction end face parts 21a and 21b of a back metal 21 in a pad 20 and torque receiving parts 31 and 32 facing the parts 21a and 21b, the pad clip 40 provided at a portion to be the rotation inlet side of a disc rotor 10 when advancing the vehicle is integrally provided with a first spring application part 45 for normally energizing the pad 20 to the rotor rotation outlet side when advancing the vehicle, and is integrally provided with a second spring application part 46 for repulsively receiving and supporting the pad 20 by a spring force larger than a spring force of the first spring application part 45 after the pad 20 moves for a prescribed distance against the spring force of the fist spring application part 45 at the time of reverse braking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake for a vehicle, and more particularly to a disc for a vehicle in which a pad clip is interposed between a circumferential end face of a back metal of a pad of a pad and a torque receiving section facing the end face. About brakes.

[0002]

2. Description of the Related Art In this type of disc brake,
In order to ensure the slidability of the pad in the pressing direction (rotor axial direction), a predetermined rotor circumferential clearance is provided between the rotor circumferential end face of the back metal of the pad and the torque receiving portion facing the end face. I have. Therefore, during braking,
The pad is movable in the circumferential direction of the rotor within the range of the clearance, and the back metal of the pad may abut against the torque receiving portion to generate an abnormal noise called a cronk sound,
Means for solving such a problem is disclosed in, for example,
No. 63945 and Japanese Patent Application Laid-Open No. 10-103393.

[0003]

SUMMARY OF THE INVENTION
In the means proposed in Japanese Patent No. 3945, a cushioning material is provided separately from the pad clip, and the pad is resiliently received by the cushioning material. For this reason, an increase in cost due to an increase in parts is inevitable. On the other hand, the means proposed in JP-A-10-103393 described above is
The pad is always urged toward the rotor outlet side when the vehicle is moving forward by a spring acting portion provided integrally with the pad clip. Therefore, in order to obtain an effective effect in such a configuration, it is necessary to set the spring force (spring load) of the spring acting portion large, and the sliding resistance in the pressing direction becomes large during non-braking, and the drag is increased. The torque may increase.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a vehicle in which a pad clip is interposed between a circumferential end face of a back metal of a pad on a pad and a torque receiving section facing the end face. In the disc brake for a vehicle, a first spring acting portion that constantly urges the pad to the rotor exit side during forward movement is integrated with the pad clip provided at a portion that is the reversing side of the disk rotor when the vehicle advances. And the pad is resiliently moved with a spring force greater than the spring force of the first spring action portion after the pad moves a predetermined amount against the spring force of the first spring action portion during reverse braking. The invention is characterized in that a second spring acting portion for receiving the spring is integrally provided (the invention according to claim 1).

In this case, the second spring acting portion is formed in a mountain shape in the circumferential direction of the rotor, and in the free state, a part thereof is provided on the end face of the back metal in the circumferential direction of the rotor. It is accommodated in the concave portion, and the remaining portion protrudes from the concave portion by a required amount in the circumferential direction of the rotor.
Or the second spring action portion is configured to resiliently receive the pad so that the remaining portion is accommodated in the recess (the invention according to claim 3). ,
Alternatively, the angled head of the second spring action portion is housed in the concave portion, and when the second spring action portion resiliently receives the pad, the angle shape of the second spring action portion. It is possible to configure the leg portion to be pushed by both edges of the opening of the recess (the invention according to claim 4).

[0006]

In the disc brake for a vehicle according to the present invention (the invention according to claim 1), when the brake is not applied, the pad is the spring force (small spring force) of the first spring acting portion provided on the pad clip. , And is urged to the rotor outlet side at the time of forward movement, and is in contact with the torque receiving portion at its end face portion. Therefore, the pad does not move in the circumferential direction of the rotor (rotor outlet side) during braking when the vehicle advances, and the back metal of the pad does not abut against the torque receiving portion.

[0007] Further, during braking when the vehicle is moving backward, the pad moves in the circumferential direction of the rotor, but the spring force of the first spring acting portion acts in the initial stage of the movement, and the first spring acting portion acts in the late stage of the movement. And the spring force of the second spring acting portion (large spring force) act synergistically to effectively reduce the impact when the back metal of the pad comes into contact with the torque receiving portion. Therefore, it is possible to effectively suppress the generation of the cronk sound.

By the way, the spring force of the first spring acting portion is:
A small force enough to press the pad against the rotor retreating side at the time of forward braking when the brake is not applied is sufficient, and does not adversely affect the drag torque. Further, since the first spring action portion and the second spring action portion are provided integrally with the pad clip, there is no increase in the number of components and the cost increases due to the increase in the number of components (increase in manufacturing cost and assembly cost). However, cost increase can be suppressed to a small extent.

Further, in the vehicle disk brake according to the present invention (the invention according to claim 2), in addition to the operation and effect of the invention according to claim 1, a concave portion provided in the back metal of the pad has a chevron shape. Since a part of the formed second spring action portion is accommodated, the second spring action portion can be arranged compactly by effectively using the back metal of the pad.

In the vehicle disk brake according to the present invention (the invention according to claim 3), in addition to the function and effect of the invention according to claim 2, the second spring action portion repels the pad. When receiving the second spring, the remaining portion of the second spring acting portion (the portion projecting from the recess of the back metal in a free state) is accommodated in the recess provided on the back metal of the pad. The action portion can be prevented from being deformed by pressure more than necessary, and the durability of the second spring action portion can be secured.

Further, in the vehicle disk brake according to the present invention (the invention according to claim 4), in addition to the function and effect of the invention according to claim 2, the angled head of the second spring action portion is provided. When the second spring action portion resiliently receives the pad, the second spring action portion is accommodated in a recess provided in the back metal of the pad.
Since the angled legs of the spring acting portion are pushed by both edges of the opening of the concave portion, a large spring force can be secured in a small space. Further, since the chevron legs of the second spring action portion resiliently receive the pad at two locations separated by a predetermined amount in the rotor radial direction, the behavior of the pad during braking can be stabilized.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of a vehicle disc brake according to the present invention.
In the disc brake according to the first embodiment, FIG.
Each pad 20 for holding and braking the disk rotor 10 (rotating integrally with a wheel not shown) indicated by an imaginary line from both front and rear surfaces is formed by a rotor circumferential end face 21 of a back metal 21.
a, 21b, the pad clips 40, 5 are attached to the arms 31, 32, which are the torque receiving portions of the mounting 30, respectively.
0 is slidable in the rotor axis direction. In addition, the rotor circumferential end surfaces 21a and 21b have
Concave portions 21a1 and 21b1 whose dimensions in the circumferential direction of the rotor are Lo are formed.

As is well known, each pad 20 has a movable caliper mounted on the mounting 30 so as to be slidable in the rotor axis direction, and a piston mounted on the mounting caliper so as to be slidable in the rotor axis direction (both not shown). Thus, it is configured to be pushed toward the disk rotor 10. The mounting 30 is formed in a shape that straddles the disk rotor 10 and is attached to the vehicle body using bolts (not shown) inserted into the mounting holes 33 and 34 inside the vehicle of the disk rotor 10. I have.

The pad clip 40 is provided at a portion (left side portion in FIG. 1) on the reciprocating side of the disk rotor 10 when the vehicle moves forward. As shown in FIG. 3, the pad clip 40 is connected to the arm 31 of the mounting 30. Mounting pieces 41, 42, 4
3, and a spring action portion 45 that constantly biases the pad 20 in the radial direction of the rotor and a spring action portion 45 that constantly biases the pad 20 to the rotor outlet side (the right side in FIG. 1) when the pad 20 advances. When the reverse braking is performed, the pad 20 is
After a predetermined amount L1 has been moved against the spring force of
5 has a spring action portion 46 that resiliently receives the pad 20 with a spring force greater than the spring force of No. 5.

The spring action portion 46 is formed in a chevron shape in the circumferential direction of the rotor. In its free state, the dimension in the circumferential direction of the rotor is L2, and a part (a chevron head) 46a of the rotor 20 of the back metal 21 in the pad 20. It is accommodated in a concave portion 21a1 in the rotor circumferential direction provided on the circumferential end face portion 21a, and the remaining portion (angle-shaped leg portion).
46b is a required amount (L2
-Lo) It is configured to protrude. Spring action part 4
The 6 chevron legs 46b are configured to be accommodated in the recesses 21a1 having the Lo dimension in the rotor circumferential direction when the pads 20 are resiliently received.

On the other hand, the pad clip 50 is provided at a portion (the right portion in FIG. 1) on the side of the disk rotor 10 when the vehicle advances, and as shown in FIG. Mounting pieces 51,5
2 and 53 as well as a spring action portion 54 for constantly biasing the pad 20 in the radial direction of the rotor, and a portion corresponding to the spring action portions 45 and 46 of the pad clip 40. I haven't.

In the disc brake of the first embodiment configured as described above, when the brake is not applied, the pad 20 is rotated by the spring force (small spring force) of the spring action portion 45 provided on the pad clip 40 when the rotor advances. And is in contact with the arm (torque receiving portion) 32 of the mounting 30 via the pad clip 50 at the end surface 21b. For this reason, during braking when the vehicle is moving forward, the pad 20
Does not move in the circumferential direction of the rotor (rotor outlet side), and the back metal 21 of the pad 20 does not abut against the arm (torque receiving portion) 32 on which the pad clip 50 is mounted.

In braking when the vehicle is moving backward, the pad 20 moves in the circumferential direction of the rotor (to the left in FIG. 1), but in the initial stage of the movement, the spring force of the spring action portion 45 of the pad clip 40 acts. In the latter stage of the movement, the spring force of the spring action part 45 and the spring force (large spring force) of the spring action part 46 act synergistically, so that the back metal 21 of the pad 20 is attached to the arm (torque receiving part) on which the pad clip 40 is mounted. The shock at the time of contact with the base member 31 is effectively reduced. Therefore, it is possible to effectively suppress the generation of the cronk sound.

By the way, the spring force of the spring action portion 45 of the pad clip 40 should be small enough to press the pad 20 against the rotor unwinding side at the time of non-braking, so that it does not adversely affect the drag torque. Absent. Further, since the spring action portion 45 and the spring action portion 46 of the pad clip 40 are provided integrally with the pad clip 40, there is no need for additional parts, and the cost associated with the additional parts increases (the production cost and the assembly cost increase). ), So that the cost increase can be kept small.

In the present embodiment, the pad 20
The recess 21a1 provided in the back metal 21 of this embodiment accommodates a part of the chevron-shaped spring action portion 46, that is, the chevron-shaped head portion 46a. Can be arranged compactly. Moreover, when the spring action portion 46 resiliently receives the pad 20, the remaining portion of the spring action portion 46 (the chevron leg 46b projecting from the recess 21a1 of the back metal 21 in a free state) is formed by the back metal 21 of the pad 20. , The spring action portion 46 can be prevented from being deformed more than necessary, and the durability of the spring action portion 46 can be secured. Therefore, the spring action part 46
(The function of resiliently receiving the pad 20) can be stably obtained for a long period of time.

In the disc brake of the first embodiment, when the spring action portion 46 resiliently receives the pad 20, the remaining portion of the spring action portion 46 (in the free state, the back metal 21
The recesses 21a1 project from the recesses 21a1 are accommodated in the recesses 21a1 provided in the back metal 21 of the pad 20. However, as in the disc brake of the second embodiment shown in FIG. The chevron-shaped head 46a of the spring action portion 46 of the pad clip 40 is
When the spring action portion 46 is resiliently received on the pad 20, the angled leg portion 46b of the spring action portion 46 is pushed by both edges of the opening of the recess portion 21a1. It is also possible to implement with such a configuration.

In the second embodiment, the spring action span D2 when the spring action portion 46 resiliently receives the pad 20 is made smaller than the spring action span D1 of the first embodiment (see FIG. 2). Therefore, a large spring force can be secured in a small space. Also, the spring action part 4
Since the six chevron legs 46b resiliently receive the pad 20 at two locations separated by a predetermined amount in the rotor radial direction, the behavior of the pad 20 during braking can be stabilized.

In each of the above embodiments, the present invention is applied to a movable caliper type disc brake. However, the present invention can be similarly applied to a fixed caliper type disc brake. Further, in each of the above embodiments, the recesses 21 are formed in the rotor circumferential end surfaces 21 a and 21 b of the pad 20.
Since a1 and 21b1 are formed, the inner pad and the outer pad can be shared.

[Brief description of the drawings]

FIG. 1 is a first view of a vehicle disk brake according to the present invention;
It is a side view showing an embodiment.

FIG. 2 is an enlarged view of a main part of FIG.

3 is a front view (a), a side view (b) and a plan view (c) of the pad clip shown in FIG. 2 alone.

FIG. 4 shows a second embodiment of the vehicle disc brake according to the present invention.
It is a principal part enlarged side view which shows embodiment.

[Explanation of symbols]

10 rotor, 20 pad, 21 back metal, 21a, 2
1b: end portion in the rotor circumferential direction, 21a1, 21b1: concave portion, 30: mounting, 31, 32: arm (torque receiving portion), 40: pad clip, 41, 42, 43
... Mounting piece part, 44 ... Spring acting part, 45 ... (First) spring acting part, 46 ... (Second) spring acting part, 46a ... Gang head, 46b ... Gang leg.

Claims (4)

[Claims] 1. A disk brake for a vehicle in which a pad clip is interposed between a rotor circumferential end surface of a back metal of a pad and a torque receiving portion opposed thereto, the disk brake being on the reciprocating side of the disk rotor when the vehicle advances. A first spring acting portion that constantly urges the pad to the rotor outlet side during forward movement is provided integrally with the pad clip provided at the portion, and the pad is provided with the first spring acting portion during reverse braking. A second spring acting portion for resiliently receiving the pad with a spring force greater than the spring force of the first spring acting portion after moving a predetermined amount against the spring force of A vehicle disk brake characterized by the following. 2. The disk brake according to claim 1, wherein the second spring action portion is formed in a chevron shape in a circumferential direction of the rotor, and a part of the second spring action portion is in a free state in a rotor circumference of the back metal. A disc brake for a vehicle, characterized in that the disc brake is accommodated in a rotor circumferential direction recess provided on a direction end face portion, and the remaining portion protrudes from the recess in a rotor circumferential direction by a required amount. 3. The disc brake for a vehicle according to claim 2, wherein when the second spring acting portion resiliently receives the pad, the remaining portion is accommodated in the concave portion. Disc brake for vehicles, characterized in that: 4. The disc brake for a vehicle according to claim 2, wherein the chevron-shaped head of the second spring action portion is housed in the concave portion, and the second spring action portion resiliently touches the pad. A disc brake for a vehicle, characterized in that, when receiving, the chevron leg of the second spring acting portion is pushed by both edges of the opening of the recess.