JPH10184745A - Disc brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain springing force in the radial direction and the circumferential direction of a disc at a pad spring as preset easily, and even if the springing force in one direction is changed, prevent it from having influence on the other one. SOLUTION: A pad spring 13 is formed, between the spring receiving part 4f of a friction pad 4 and hanger pins 12, 12, with the first spring part 13e which springs the friction pad 4 inward in the radial direction of a disc, the second spring parts 13f, 13f which spring the disc turning-in side surface 11a of a roof opening part 11, and the third spring part 13g which springs the disc turning-in side surface of a suspending part 4e on the disc turning-out side of the friction pad 4 in a disc turning-out direction and presses the disc turning- out side surface of the friction pad 4 against the torque receiving part 3g of the disc turning-out side along with the second spring parts 13f, 13f.

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 for a traveling vehicle such as an automobile or a motorcycle.
More specifically, the present invention relates to a structure in which a backlash of a friction pad suspended by using a pair of hanger pins on both sides of a disk rotor is suppressed by a pad spring.

[0002]

2. Description of the Related Art A conventional disc brake for a vehicle in which rattling of a friction pad is suppressed by a pad spring is disclosed, for example, in Japanese Patent Publication No. 1-59458. In this technique, a hanger pin is inserted into a pair of suspension portions extending above a back plate, and a friction pad is suspended on both sides of the disk rotor so as to be movable in a disk axial direction. Attach the center of the pad spring to the spring mounting wall that hangs from the center of the inner surface of the bridging bridge to the suspension of the friction pad, and attach the springs on both sides of the pad spring to the upper part of the opposite surface of the suspension of the friction pad. To apply a biasing force in the disk radial direction and the disk circumferential direction to the friction pad, and to set the load on one side in the disk circumferential direction by one spring portion and the other side in the disk circumferential direction by the other spring portion. By setting the load larger than the set load on the disc, the friction pad may rattle in the radial direction of the disc due to the running vibration of the So that there is no possible to change rapidly in the direction out of click times.

[0003]

In such a configuration, the spring portion of the pad spring and the suspension portion of the friction pad are contacted obliquely in both the disk radial direction and the disk circumferential direction. By contacting the friction pads, the biasing force in the disc radial direction and the disc circumferential direction acts on the friction pad as a component force. There is a problem that sticking occurs and it is difficult to exhibit stable spring performance. Further, when the elastic force in one direction of the spring portion changes, the elastic force in the other direction also changes at the same time.

[0004] Therefore, the present invention is to provide a pad spring which can obtain elasticity in a disk radial direction and a disk circumferential direction as set, and that even if the elasticity in one direction changes, the other is affected. It is an object of the present invention to provide a disc brake for a vehicle without any.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a bridge opening of a caliper body straddling the outer periphery of a disk rotor, and a torque opening on both sides of the disk rotor through the ceiling opening. A pair of suspending portions are respectively extended to a pair of friction pads disposed between the receiving portions, and a pair of hanger pins suspended in the disc axial direction through a ceiling opening in the caliper body are provided on the suspending portions. Inserting and suspending the friction pad movably in the disc axis direction, and in a vehicle disc brake in which a pad spring is contracted between the friction pad and the pair of hanger pins, the pad spring includes:
A first spring portion for repelling the friction pad inward in the disc radial direction between a center of the friction pad in the radial direction of the disk and the pair of hanger pins, and a second spring for repelling the disk entry side surface of the ceiling opening. A spring part,
One or both suspension portions of the friction pad are resiliently ejected in the disc rewinding direction in the disc retraction direction, and the disc retraction side surface of the friction pad is pressed against the disc retraction side torque receiving portion together with the second spring portion. And a third spring portion. The above-described pad spring may be integrally provided with a cover portion that covers the suspension portion of the friction pad.

With this configuration, the elastic force of the first spring portion inward in the radial direction of the disk is biased inward from the center of the outer surface of the friction pad in the radial direction of the disk to the center axis of the friction pad in the radial direction of the disk. As a result, rattling in the radial direction of the disc due to running vibration of the vehicle body can be favorably maintained for a long period of time.

Further, the second spring portion and the third spring portion are located on the side of the suspension portion of the friction pad held by the hanger pin inside the ceiling opening, on the side where the disk enters or exits. The urging force of the second and third springs in the disc ejecting direction moves the friction pad parallel to the disc ejecting direction through the suspension portion, and the disc ejecting side surface of the friction pad receives the torque on the disc ejecting side. Press without tilt.

Since the first to third spring portions are provided independently of the pad springs, the friction pads can be provided with a set biasing force without variation between the radially inner side of the disc and the disc ejecting direction. become. Also,
Even if any one of the first to third spring portions fluctuates in the radial direction of the disk and in the direction in which the disk extends, the remaining resilient force does not need to be changed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a first embodiment of the present invention. A vehicle disk brake 1 includes a disk rotor 2 that rotates integrally with a wheel (not shown) in the direction of arrow A, and one side of the disk rotor 2. And a pair of friction pads 4 and 4 disposed on both sides of the disk rotor 2 to face each other.

The caliper body 3 includes a bridge portion 3e which straddles the outside of the disk rotor 2 and connects the working portions 3c and 3d.
Is divided along the center line of the thickness of the disk rotor 2, and the divided surfaces of the bridge portion 3e divided into two halves of the caliper halves 3a and 3b are abutted to each other to connect the caliper halves 3a and 3b to two connecting bolts 6, 6 and are integrally connected with each other.
A piston 8 is inserted through a square seal 9 in a fluid-tight and movably inserted manner into a cylinder hole 7 provided opposite to 3d, and a hydraulic pressure chamber is provided between the piston 8 and the cylinder hole 7. 10 is defined.

At the center of the bridge 3e, a rectangular ceiling opening 11 is formed having a size that allows the friction pads 4 and 4 to be inserted into both sides of the disk rotor 2. On both sides of the front surface of the cylinder hole 7, torque receiving portions 3f,
3g is continuously provided on the disk entrance side surface 11a and the disk exit side surface 11b of the ceiling opening 11, and the friction pads 4, 4 are provided on the torque receiving portions 3f, 3g on each side of the disk rotor 2. It is arranged over the front surface of the sandwiched cylinder hole 7 and the ceiling opening 11.

Each friction pad 4 has a lining 4a which is in sliding contact with the side surface of the disk rotor 2, and a pair of hanger pins 1
Back plate 4 held on caliper body 3 via 2 and 12
b. The main body 4c of the back plate 4b to which the lining 4a is joined is formed to be slightly narrower than the gap between the torque receiving portions 3f and 3g, and has horizontally long pin holes 4d and 4d on both sides of the outer surface in the disk radial direction. A pair of suspended portions 4e, 4e are extended, and a spring receiving portion 4f protrudes between the suspended portions 4e, 4e.

The friction pad 4 inserted from the ceiling opening 11 is connected to the main body 4c of the back plate 4b by the torque receiving portions 3f, 3c.
g, the hanging portions 4e, 4e of the back plate 4b are accommodated in the ceiling opening 11, respectively, and the hanger pins erected in the axial direction of the disc through the ceiling opening 11 to both the working portions 3c, 3d. 12 and 12 are inserted into the pin holes 4d and 4d of the suspension portions 4e and 4e, and are suspended so as to be movable in the disk axis direction. The back plate 4b and the ceiling opening 11 and the hanger pins 12 and 12 The pad spring 13 is engaged.

The pad spring 13 includes a substrate 13a having a V-shaped shallow depression, two restraining pieces 13b, 13b extending on both sides of the central portion of the substrate 13a, and one wing piece 13b.
Two cover portions 13c, 13c projecting in a substantially U-shape from both sides of one side of the substrate 13a with the holding member 13b interposed therebetween.
And two cover portions 13d, 13d protruding in a substantially L-shape from both sides of the other side of the substrate 13a with the substrate 13a interposed therebetween. The first spring portion 1 comprises the substrate 13a and the suppressing pieces 13b, 13b.
3e is configured.

The four cover portions 13c, 13c, 13d,
13d is formed to have a size that covers the suspension portions 4e, 4e of the friction pads 4, 4, and has a cover portion 13c,
In 13c, the tip side piece folded back in the direction of the restraining piece 13b is expanded slightly in a V-shape to form a second spring portion 13b.
f, 13f, and covers 13d, 13 on the other side.
In d, the rising pieces from the substrate 13a are formed as third spring portions 13g, 13g.

In the pad spring 13 configured as described above, the inner surface of the central portion of the substrate 13a of the first spring portion 13e is attached to the outer surface of the spring receiving portion 4f of the friction pads 4 and 4, and the first spring portion 13e 13b,
By elastically contacting the lower surfaces of the hanger pins 12 with the hanger pins 12, the first spring portion 13e applies a biasing force in the disk radial direction to the friction pads 4 and 4, respectively.

The cover portions 13c, 13c on one side are provided to cover the suspension portions 4e, 4e on the disk entry side, and the second spring portions 13f, 1c of the cover portions 13c, 13c.
3 f is in elastic contact with the disk entry side surface 11 a of the ceiling opening 11. Further, the cover portions 13d, 13d on the other side are provided so as to cover the suspension portions 4e, 4e on the disc outlet side, and the third spring portions 13g, 1 of the cover portions 13d, 13d are provided.
3g is elastically contacted in parallel with the disk entry side surface of the suspension portions 4e, 4e on the disk exit side.

A resilient force from the second spring portion 13f and the third spring portion 13g acts on the suspension portion 4e on the disc feeding side of each friction pad 4 in the disc feeding direction through the third spring portion 13g. Each of the friction pads 4 is urged in the disc ejecting direction by the urging force of the second and third spring portions 13f and 13g, and the disc ejecting side surface of the main body 4c of the back plate 4b is located on the disc ejecting side. Torque receiver 3
g and the disk outlet side surface 11b of the ceiling opening 11.

In this embodiment, the pad spring 13 is used to firstly urge the friction pads 4 and 4 radially inward in the disk direction.
The spring portion 13e and the second spring portion 13f and the third spring portion 13g that repel the friction pads 4 and 4 in the disk feeding direction are provided separately and independently, so that the spring portions 13e to 13g are resilient. Even if the repulsive force acts alone and the resilient force of one of the spring portions 13e to 13g fluctuates, the other resilient force does not need to be changed.

The elastic force of the first spring portion 13e inward in the radial direction of the disk is applied to the main body portion 4c of the back plate 4b.
From the spring receiving portion 4f located at the center portion of the outer surface of the disk in the radial direction of the disk, acts on the center axis of the friction pad 4 in the radial direction of the disk as a biasing force inward in the radial direction of the disk, and causes the friction pad 4 to tilt. Therefore, rattling in the disk radial direction due to running vibration of the vehicle body can be favorably maintained for a long period of time.

Further, the second spring portion 13f and the third spring portion 13g are formed by suspending portions 4e, 4 of the friction pad 4 held by the hanger pins 6, 6 inside the ceiling opening 11.
e is located on the side of the disk reciprocating side of the friction pad 4a through the suspension portions 4e, 4e.
Acts as an urging force to move the disk in the direction in which the disk is ejected in parallel. 11b, the friction pad 4 is pressed against the disc receiving side torque receiving portion without tilting, so that the friction pad 4 does not fluctuate due to sudden braking, and the loss of braking torque and the generation of annoying abutment sound can be improved for a long period of time. Can be deterred.

The cover 1 of the pad spring 13
3c, 13c, 13d, and 13d are friction pads 4 and 4
Since the hanging portions 4e are covered, water and earth and sand can be prevented from entering the pin holes 4d and impairing the slidability of the friction pads 4 and 4.

Next, second and third embodiments of the present invention will be described with reference to FIGS. In the pad spring 13 shown in the second embodiment of FIG. 5, a second spring portion 13f and a third spring portion 13g are provided on one side of the cover portion 13c which covers the suspension portion 4e on the disk reciprocating side. Is provided. The second spring portion 13f is formed by using a tip side piece of the cover portion 13c as in the first embodiment, and the third spring portion 13g is formed by covering a strip extending from the second spring portion 13f with a cover. The second inside the part 13c
It is bent back substantially along the spring portion 13f.
The spring portion 13f is elastically contacted with the disk entry side surface 11a of the ceiling opening 11, and the third spring portion 13g is elastically contacted with the disk entry side surface of the suspension portion 4e on the disk entry side in parallel. 4 is provided with an urging force in the disc feeding direction.

FIG. 6 shows a third embodiment which is a modification of the second embodiment. In the pad spring 13, a second spring portion 13f formed on each cover portion 13c on one side is replaced by a pad spring 13 which is different from the second embodiment. The second spring portion 13f is also greatly inclined outward to increase the distance between the third spring portion 13g and the second embodiment. Hit the surface 3h,
The third spring portion 13g is resiliently contacted in parallel with the disk retraction side surface of the suspension portion 4e on the disk retraction side to apply a biasing force to the friction pad 4 in the disk retraction direction.

The second spring portion 13f and the third spring portion 13g shown in the second and third embodiments are formed inside the ceiling opening portion 11 by the disk entrance side surface 11a and the suspension portion 4e on the disk entrance side. Since the friction pad 4 is located between the friction pads 4 in the disk ejecting direction through the suspension portion 4e on the disk entry side, the elasticity of the second and third spring portions 13f and 13g in the disk ejecting direction is combined. Since it acts satisfactorily as a biasing force that moves in parallel as it is, similarly to the first embodiment, the disk feeding side surface of the main body 4c of the back plate 4b is set in advance with the torque receiving portion 3g on the disk feeding side and the ceiling opening. The disc receiving side 11b can be pressed against the disc receiving side torque receiving portion without tilting.

Incidentally, the pad spring of the present invention may be provided with two third sprink portions and provided on the disc reciprocating side of a pair of suspension portions of the friction pad. The present invention also provides
The present invention can be applied to a caliper body of a type other than the embodiment.

[0027]

As described above, in the vehicle disk brake of the present invention, the friction between the center of the outer surface of the friction pad in the disk radial direction and the pair of hanger pins for suspending the friction pad is provided by the pad spring. A first spring portion for urging the pad radially inward of the disk, a second spring portion for resiliently projecting the disk entry side surface of the ceiling opening, and a disk entry side surface of one or both suspension portions of the friction pad And a third spring portion that presses the disk-outside surface of the friction pad against the torque-receiving portion on the disk-outward side together with the second spring portion. Of the first to third spring portions fluctuate. Even if there is, you need not apply the change to the resilient force of the other spring portion. Therefore, a predetermined elastic force can be easily set for each spring portion, and since there is little variation in each elastic force, a stable urging force can be applied to the friction pad.

The elastic force of the first spring portion inward in the radial direction of the disk acts as a biasing force inward in the radial direction of the disk from the center of the radially outer surface of the friction pad to the center axis of the friction pad. Therefore, rattling in the disk radial direction due to the running vibration of the vehicle body can be favorably maintained for a long time.

Further, since the second spring portion and the third spring portion are located on the side of the suspension portion held by the hanger pin inside the ceiling opening, the disk is turned out by the second and third spring portions. Direction of the friction pad in parallel with the disk ejecting direction through the suspension portion, and works well as a biasing force to move the friction pad in the disk ejecting direction. Since the friction pad is pressed against the torque receiving portion without tilting, the friction pad does not fluctuate due to sudden braking, and loss of braking torque and generation of annoying abutment sound can be favorably suppressed for a long time.

Further, by providing a cover portion for covering the suspension portion of the friction pad on the pad spring, water or earth and sand may adhere to the hanger pin or enter the pin hole of the suspension portion to slide the friction pad 4. No loss of quality.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line II of FIG. 2 showing a first embodiment of the present invention;

FIG. 2 is a plan view of a disc brake showing a first embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1, showing a first embodiment of the present invention;

FIG. 4 is a perspective view of a pad spring showing a first embodiment of the present invention.

FIG. 5 is a sectional view of a disc brake showing a second embodiment of the present invention.

FIG. 6 is a sectional view of a disc brake showing a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake for vehicles 2 ... Disc rotor 3 ... Caliper body 3a, 3b ... Caliper half 3c, 3d ... Working part 3e ... Bridge part 3f ... Torque receiving part on the disk entrance side 3g ... Torque receiving on the disk exit side Part 3h: Spring receiving surface 3h 4: Friction pad 4a: Lining 4b: Back plate 4c: Body part of the back plate 4b 4d: Pin hole of the hanging part 4e 4e: Hanging part 4f: Spring receiving part 11: Ceiling opening Reference numeral 11a: Disk revolving side surface of the ceiling opening 11b: Disk revolving side surface of the ceiling opening 12 ... Hanger pin 13 ... Pad spring 13a ... Substrate 13b ... Suppression pieces 13c, 13d ... Cover part 13e ... Substrate 13a and suppression piece 13b, 1st spring part 13f consisting of 13b ... second spring part 13g ... third spring part

Claims (2)

[Claims] 1. A ceiling opening is provided in a bridge portion of a caliper body straddling the outer periphery of a disk rotor, and a pair of friction pads provided between the torque receiving portions on both sides of the disk rotor through the ceiling opening. Is extended, and a pair of hanger pins installed in the disc axial direction through the ceiling opening through the caliper body are inserted through the suspending portion, and the friction pad is movably suspended in the disc axial direction. In a vehicle disc brake having a pad spring contracted between the friction pad and the pair of hanger pins, the pad spring includes a disc radially outer surface center of the friction pad and the pair of hanger pins. A first spring portion for repelling the friction pad radially inward of the disc, and a disc revolving side surface of the ceiling opening And a second spring portion that repels the disk and a suspension surface of one or both of the friction pads repels the disk revolving side of the friction pad in the disk rewinding direction. A disc brake for a vehicle, comprising a third spring portion that presses against a torque receiving portion on an outlet side. 2. The disc brake for a vehicle according to claim 1, wherein said pad spring is provided with a cover portion for covering a suspension portion of said friction pad.