JP2596090Y2 - Disc brakes for vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake used for a running vehicle such as an automobile or a motorcycle. The present invention relates to a structure in which a shim plate to be mounted is used to prevent as much as possible.

[0002]

2. Description of the Related Art A friction pad used for a disc brake is known in which a shim plate using a thin metal plate is attached to the back of a back plate to prevent brake noise and uneven wear of a lining during braking. An example is disclosed in Japanese Utility Model Publication No. 51-44071.

According to this technique, a side surface of a shim plate in a disk circumferential direction is bent in a lining direction on a back plate side of a friction pad, and at least a part of the bent piece is elastically covered.
By separating the side of the back plate from the torque receiving surface of the pad guide formed on the caliper bracket, even if rust grows on the torque receiving surface, the friction pad will not lock with the rust, and the friction pad will not be locked. Can smoothly move in the axial direction of the disk, and in effect, the bent piece of the shim plate is bent so as to be resiliently lifted from the torque receiving surface of the pad guide, so that the back plate It is said to soften the impact with the torque receiving surface and prevent hitting.

[0004]

When the braking operation is performed in such a configuration, the friction pad is slid together with the shim plate in the disk feeding direction by the braking torque generated by sliding contact with the disk rotor. The bending piece on the side of the shim plate is sandwiched between the torque receiving surface on the disc feeding side and the back plate of the friction pad, and the total braking torque of the friction pad is applied to the torque receiving surface through the bending piece on the shim plate. Will be communicated. As a result, not only is the shim plate damaged and its durability is lost, but also the bent pieces of the shim plate are permanently deformed and the elastic force disappears at an early stage. In addition, the friction pad was rattled integrally with the shim plate in the circumferential direction of the disk due to the vibration of the seam of the pavement and the vibration of the uneven road, and the generation of unpleasant contact noise was inevitable.

The present invention has been made in view of such circumstances, and an object thereof is to minimize the pad contact noise generated during normal running and braking while improving the durability of the shim plate. It is an object of the present invention to provide a disk brake for a vehicle that can be used.

[0006]

According to the above-mentioned object, a first method is provided.
In the invention, the torque receiving surface of the caliper bracket is opposed to the side of the disk rotor, a friction pad is disposed between the two torque receiving surfaces, and a shim plate is attached to the back of the friction plate. In the vehicle disc brake, a plurality of elastic claws are provided on the shim plate to allow relative movement of the shim plate and the friction pad in the disk circumferential direction, and the elastic claws are attached to a back plate of the friction pad. and engaged with, the sheet
A pair of bent pieces at both ends of the disk
Projecting to face the ring direction, the distance Lt between the torque receiving surface, the spacing Ls between the pair of bent piece of the shim plate,
The length Lp of the friction pad in the disk circumferential direction is represented by Lt.
Ls> Lp.

In a second aspect of the present invention, a caliper bracket fixed to a vehicle body is formed with a groove-shaped torque receiving portion facing a side portion of a disk rotor, and both torque receiving portions are provided on both sides of a back plate of a friction pad. A disc brake for a vehicle in which a lug projecting to a part is locked, the friction pad is hung, and a shim plate is mounted on the back surface of the back plate, wherein the shim plate, the shim plate and the friction pad are mounted on the shim plate. A plurality of elastic claws projecting to allow relative movement of the shim plate in the circumferential direction of the disc;
A pair of bent pieces at both ends facing each other in the anti-lining direction
Projecting the distance Lt between the torque receiving surface, said shim plate
The distance Ls between the pair of bent pieces and the length Lp of the friction pad in the disk circumferential direction are set in a relationship of Lt ≧ Ls> Lp.

[0008]

When the braking operation is performed in the first configuration, the friction pad and the shim plate are slid together in the disk feeding direction by the braking torque generated by sliding contact with the disk rotor. Of the shim plate protruding from the disc
Only the bent piece comes into contact with the torque receiving surface on the disc outlet side, and then the friction pad causes the side surface of the back plate to come into contact with the torque receiving surface due to deformation of the elastic claw pieces.

In the second configuration, when the friction pad and the shim plate float outward in the radial direction of the disk, first, only the bent piece of the shim plate wider than the lug of the back plate is used as the pad guide portion. Then, while the friction pad deforms the elastic claw piece of the shim plate, the lug of the back plate abuts on the radially outer side face of the pad guide portion.

In both configurations, the shim plate and the friction pad are brought into contact with the torque receiving surface of the pad guide portion or the outer surface in the disk radial direction in two stages. The stroke before contacting the torque receiving surface or the outer surface in the disk radial direction is short, and the mass is light, so that the contact sound is small. Further, in the second stage, after the shim plate abuts on the torque receiving surface, the elastic claw is deformed to relieve the load of the friction pad, and the contact between the friction pad and the torque receiving surface or the outer peripheral side surface in the disk radial direction is buffered. do it,
Reduce the contact noise of the friction pad. In addition, shim plate data
Each bent piece at both ends in the disk circumferential direction and inside and outside of the disk radial direction
Is the opposite of the friction pad lining and back plate
Since the friction pad protrudes in the lining direction, the braking torque of the friction pad is directly transmitted from the back plate to the torque receiving surface without sandwiching the bent piece of the shim plate.

Further, the first invention is a so-called hanger in which a friction pad is hung by a hanger pin, in addition to a disc brake configured to hold a lug of a back plate to a pad guide portion of a bracket to support the friction pad. The present invention is also applicable to a pin type disc brake.

[0012]

1 to 3 show a first embodiment of the present invention.
It will be described based on.

The disc brake 1 includes a disc rotor 2 that rotates in the direction of arrow A together with wheels (not shown), and a bracket 3 fixed to the vehicle body at one side of the disc rotor 2.
A caliper 5 supported on the bracket 3 via two slide pins 4 and 4 so as to be movable in an axial direction of the disk; and a pair of friction pads 6 disposed on both sides of the disk rotor 2 to face each other. , 6.

The bracket 3 has a pair of caliper support arms 3 extending outside the disk rotor 2 in the disk axial direction.
The ends of the support arms 3a, 3a are connected to the other side of the disk rotor 2 by tie bars 3b. On the caliper support arms 3a, 3a, groove-shaped pad guide portions 3c, 3c are provided facing each other on both sides of the disk rotor 2, and each friction pad 6 projects on both sides of the back plate 8. Ear pieces 8a, 8a
The pad guides 3 c are supported by pad retainers 9.

The caliper 5 is a two-piece split type in which the working part piece 5a and the reaction part piece 5b are connected by four connecting bolts 10, and the working part piece 5a is a part of the disk rotor 2. A reaction portion 5c disposed on the other side of the disk rotor 2 and a reaction portion 5c disposed on the other side of the disk rotor 2.
And a bridge portion 5e that connects the action portion 5c across the outside of the device. Mounting arm 5 protruding on both sides of action portion 5a
The above-mentioned slide pin 4 is attached to each of f and 5f by a mounting bolt 11, and the caliper 5 inserts each slide pin 4 into a pin hole 3d formed in the caliper support arm 3a. Thus, as described above, it is movably supported in the disk axial direction.

A cup-shaped piston 13 is accommodated in a cylinder hole 12 provided in the working portion 5c so as to open the disk rotor 2 side, and a hydraulic pressure chamber 14 is provided between the cylinder hole 12 and the bottom of the piston 13. Is defined.

The hydraulic chamber 14 is connected to a known hydraulic master cylinder (not shown), and when the hydraulic fluid generated in the hydraulic master cylinder is supplied to the hydraulic chamber 14, the piston 13 moves forward through the cylinder hole 12. Then, one friction pad 6 is pressed against one side surface of the disk rotor 2. Then, in this reaction,
The caliper 5 moves in the direction of the action portion 5c, and the reaction portion 5d
However, the other friction pad 6 is pressed against the other side surface of the disk rotor 2 to perform a braking action.

The friction pad 6 is formed by adhering a lining 7 made of a friction material such as a sintered metal and a metal back plate 8. A shim plate 15 is mounted on the back surface of each back plate 8 so as to minimize brake squeal generated during braking and uneven wear of the lining 7.

The shim plate 15 is formed by bending a thin metal plate having elasticity such as a stainless steel plate. The similar-shaped face plate 15a, which is slightly smaller than the back plate 8, has a bifurcated shape at the center of the outer surface of the disk. A pair of resilient pawls 15c, 15c are also provided on the inner surface of the disk, and a pair of resilient pawls 15c are provided on both sides of the disk inward and outward sides.
d and 15d are provided to protrude to one side, respectively, and below the elastic claw pieces 15d and 15d on the side surfaces, L
The character pieces 15e, 15e are protruded. Elastic claw piece 15
Each of c and 15d is formed in an S-shape, and each L-shaped piece 15e has an ear piece back part 15f projecting in parallel to the outside of the face plate 15a and a front end of the ear piece back part 15f. Folded piece 15g projecting to the other side of face plate 15a
It consists of

The shim plate 15 formed as described above has a face plate 15a against the back of the main body portion of the back plate 8 and a back surface of the ear piece 8a covered by an ear piece back portion 15f of an L-shaped piece 15e. 8 on both sides 8c, 8
d is sandwiched between the elastic nail pieces 15d, 15d, and the inner and outer surfaces of the back plate 8 are similarly engaged with the locking nail pieces 15b and the elastic nail pieces 15c, 15c.
c, and is attached to the back surface of the back plate 8. As described above, the friction pads 6, 6 to which the shim plate 15 is attached are suspended on both sides of the disk rotor 2 by locking the lugs 8a, 8a of the back plate 8 to the pad guides 3c, 3c. The back plate rear portion 15f of the L-shaped piece 15e slightly protrudes outward from the side faces 8b, 8b of the ear pieces 8a, 8a, and each bent piece 15g.
Are arranged to protrude in the anti-lining direction. Further, the friction pad 6 and the shim plate 15 are allowed to move relative to each other in the disk circumferential direction by the bending of the elastic claw pieces 15d, 15d which elastically hold both side surfaces of the back plate 8, and furthermore, the inner circumferential surface of the back plate 8 The relative movement in the disk radial direction is allowed by the bending of the elastic claw pieces 15c, 15c that resiliently hold the disk.

On the other hand, a rising piece 9a is provided on a pad retainer 9 laid on the pad guide portion 3c so as to cover a torter receiving surface 3e which is a back wall of the pad guide portion 3c. The distance between the rising pieces 9a, 9a facing each other on one side and the other side of the disk rotor 2 is determined by the shim plate 15
Are slightly wider than the length of the bent pieces 15g, 15g, and the distance between the rising pieces 9a, 9a is Lt,
Folded piece 15 that is the length of shim plate 15 in the disk circumferential direction
g, the distance between 15g and Ls, also the disk circumferential direction of the lugs 8a as the length of the friction pads 6, 8a of the side surface 8b, 8
When the length of b is Lp, these are Lt ≧ Ls>
Lp.

The present embodiment is configured as described above, and the bent piece 15g of the shim plate 15 satisfies Lt ≧ Ls> Lp
Accordingly, the friction pad 8 is located between the lug 8a of the friction pad 8 and the rising piece 9a of the pad retainer 9, and is further arranged to protrude from the face plate 15a in the anti-lining direction. When the braking action is performed as described above, the friction pad 6 and the shim plate 1
5 moves in the disk ejecting direction indicated by arrow A and the disk outward direction by the braking torque generated by sliding contact with the disk rotor 2. In the sliding movement in the direction of arrow A, the bent piece 1 of the shim plate 15 having a narrow gap with the rising piece 9a first.
5 g abuts against the rising piece 9 a, and then the elastic claw pieces 15 d, 15 d of the shim plate 15 cause the side surface 8 b of the back plate 8 on the disk feeding side to abut on the rising face 9 a of the pad retainer 9.

In this embodiment, as described above, the shim plate 15 and the friction pad 6 are connected to the rising piece 9a of the pad retainer 9 by two.
The first stage shim plate 15
In this case, the stroke before contact with the rising piece 9a is short and the mass is light, so that the contact sound can be suppressed to a small level.
Further, in the friction pad 6 at the second stage, after the shim plate 15 abuts on the rising piece 9a, the elastic claw pieces 15d, 15d are deformed to reduce the moving speed of the friction pad 6, so that the contact with the rising piece 9a is reduced. The contact is buffered, and the contact sound of the friction pad 6 is also reduced.

Further, the bent piece 15g of the shim plate 15 is arranged so as to protrude in the anti-lining direction, and the back plate 8 and the rising piece 9 are arranged.
a so that the shim plate 15 is not interposed therebetween, the braking torque of the friction pad 6 can be transmitted from the back plate 8 through the rising piece 9 a of the pad retainer 9 to the pad guide portion 3.
c is directly transmitted to the torque receiving surface 3e, and the shim plate 15
The danger of the elastic claw pieces 15d and bent pieces 15g being damaged or permanently deformed by the braking torque is eliminated, so that not only during braking, but also due to vibrations caused by seams of the pavement road or uneven roads, the friction pad 6 is moved in the disk circumferential direction. Even in the case of rattling, the unpleasant contact sound can be kept extremely low for a long period of time.

In this embodiment, the L-shaped piece 1 is attached to the shim plate 15.
5e is protruded so that the bent piece 15g at the tip comes into contact with the rising piece 9a of the pad retainer 9, so that a high rigidity is obtained on the side surface of the shim plate 15. Further, it is preferable to provide an elastic material such as rubber on the outer surface of the bent piece 15g which comes into contact with the rising piece 9a, because the contact sound of the friction pad 6 can be further prevented.

FIG. 4 and FIG. 5 show a second embodiment of the present invention. In this embodiment, the shim plate 15 is a back portion 1 of an L-shaped piece 15e.
Folded pieces 15h, 15h protruding in the anti-lining direction are provided on the outer side and the inner side in the disk radial direction of 5f, and the other parts are the same as in the first embodiment.

The bent pieces 15h are respectively formed on the outer surface 8c and the inner surface 8d of the lug 8a of the back plate 8 in the disk radial direction.
The ear piece rear part 1 is provided so as to be located outside the
A bent piece 15h having a length in the disk radial direction of 5f,
The distance of 15h is Hs, the distance between the upper and lower pieces 9b and 9c of the pad retainer 9 laid on the radially outer surface 3f and the inner surface 3g of the pad guide portion 3c is Ht, and the disk radius of the ear piece 8a is Ht. When the length in the direction is Hp, these are set in a relationship of Ht ≧ Hs> Hp.

Vertically bent pieces 15h, 15h of the shim plate 15
A gap is set between the upper bent piece 15h and the upper piece 9b of the pad retainer 9 with the outer side surface 8c and the inner side surface 8d of the ear piece 8a in the radial direction of the disk interposed therebetween. When the braking action is performed in such a configuration, the friction pad 6 and the shim plate 15 are integrally moved in the disk feeding direction indicated by the arrow A and the disk outer peripheral direction by the braking torque generated by sliding contact with the disk rotor 2. Go to

Among the movements of the friction pad 6 and the shim plate 15, the sliding movement in the direction of arrow A is performed by the side bent piece 15g of the shim plate 15 and the side surface 8b of the back plate 8 on the disk feeding side. As in the first embodiment, the rising piece 9a of the pad retainer 9 is brought into contact with the rising piece 9a in two stages to suppress the occurrence of the contact sound. In addition, the lifting movement in the outward direction of the disk is caused by the upper bending piece 15h of the shim plate 15 having a narrow gap with the upper piece 9b of the pad retainer 9 coming into contact with the upper piece 9b first, and then the shim plate 15 Due to the elastic force of the elastic claw pieces 15c on the inner circumference side of the disc, the disc radially outer surface 8c of the ear piece 8a abuts on the upper piece 9b of the pad retainer 9.

As described above, in the present embodiment, the contact sound of the friction pad 6 floating outside the disk can be suppressed as much as possible while suppressing the contact sound in the disk radial direction. Further, even when the friction pad 6 rattles in the vertical direction due to the vibration caused by the seam of the pavement or the uneven road, similarly to the case of the braking, the unpleasant abutment sound is extremely suppressed for a long period of time. Can be. In addition, friction pads
6 with the backlash in the disk radial direction
The support is directly supported by the guide portion 3c.
Do not pinch the bent pieces 15h, 15h of the shim plate 15 between them.
, The bent pieces 15h, 15h have a play of the friction pad 6.
There is no danger of being damaged or permanently deformed,
The durability of the shim plate 15 can be improved.

In each of the embodiments described above, the pad guide is provided with the pad retainer. However, the present invention may omit the pad retainer .

[0032]

As described above, the disc brake for a vehicle according to the first aspect of the present invention allows the shim plate mounted on the back of the back plate of the friction pad to allow relative movement of the friction pad with the friction pad in the circumferential direction of the disc. and projecting a plurality of resilient pawls, and engaged the elastic claw piece on the back plate of the friction pad, the disc circumferential direction of the shim plate
A pair of bent pieces at opposite ends in the opposite lining direction
And the distance Lt between the torque receiving surfaces of the bracket,
When the distance Ls between the pair of bent pieces of the shim plate and the length Lp of the friction pad in the disk circumferential direction are set so as to satisfy Lt ≧ Ls> Lp, so that the friction pad rattles in the disk circumferential direction. On the back of the shim plate and the friction pad
The plate comes in contact with the torque receiving surface of the bracket in two stages.
In the first stage, the contact of the bent pieces
The stroke before contacting the receiving surface is short, and the mass
Is also light, so that the generation of contact noise can be kept small,
In the contact of the back plate at the stage, the bent piece of the shim plate
After touching the surface, the elastic claw is deformed and the friction pad is moved.
As the dynamic speed is reduced, contact with the torque receiving surface is buffered.
Thus, the contact noise between the friction pad and the bracket can be suppressed to a minimum over a long period of time.

In addition, the bent piece of the shim plate is
As a result, the braking torque of the friction pad is
Since the back plate is directly transmitted to the torque receiving surface and the shim plate bent piece is not sandwiched between them, the shim plate bent piece is damaged by the braking torque from the friction pad , There is no danger of deformation, and the durability of the shim plate can be improved.

Further, a vehicle disk drive according to the invention of claim 2 is provided.
Lakes, by projecting a plurality of resilient pawls to allow relative movement of the disk radial direction of the friction pad shim plate, and engaged the elastic claw piece on the back plate of the friction pad, backing plate ears of The back of
Disc radius of the back of the shim plate ear piece
In and out of the direction, a pair of bent pieces are opposed in the anti-lining direction
The distance Ht of the pad guide portion in the disk radial direction, the distance Hs between the pair of bent pieces of the shim plate, and the length Hp of the lug in the disk radial direction are Ht ≧ Hs> Hp.
When the friction pad rattles in the radial direction of the disc, the bent piece of the shim plate and the friction pad
The back ear of the pad is in contact with the pad guide of the caliper bracket.
To the contact part in two stages, and the first stage
When contacting the bent piece, make sure that the contact
Due to the short troke and the light mass, noise is generated
In the abutment of the back plate ear piece in the second stage,
After the bent piece of the shim plate contacts the pad guide,
Deforms the claw pieces and slows down the moving speed of the friction pad
The contact between the back plate lugs and the pad guide is buffered,
The contact noise between the rubbing pad and the bracket can be minimized over a long period of time. In addition, friction pads
If there is backlash in the radial direction,
It is now supported directly on the guide part, with a shim between
Since the bent piece of the plate is not sandwiched, the bent piece of the shim plate is friction
There is a risk of the pad being backlashed and damaged or permanently deformed
No longer can improve the durability of the shim plate
You.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view of a disc brake showing a first embodiment of the present invention.

FIG. 2 is a half sectional rear view of the disc brake showing the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of a friction pad and a shim plate showing the first embodiment of the present invention.

FIG. 4 is an enlarged view of a main part of a disc brake showing a second embodiment of the present invention.

FIG. 5 is a perspective view of a main part of a shim plate showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk brake 2 ... Disk rotor 3 ... Bracket 3a ... Caliper support arm 3c ... Pad guide part 3d ... Pin hole 3e ... Torque receiving surface 3f ... Disk radial outer peripheral surface of pad guide part 3c 3g ... Disk of pad guide part 3c Inner side surface in radial direction 4 Slide pin 5 Caliper 5a Working part piece 5b Reaction part piece 5c Working part 5d Reaction part 5e Bridge part 6 Friction pad 7 Lining 8 Back plate 8a Back Ear 8b of plate 8 ... side surface of ear 8a 8c ... outer surface of ear 8a in the disc radial direction 8d ... inner surface of ear 8a in the disk radial direction 9 ... pad retainer 9a ... rising piece of pad retainer 9 9b ... pad retainer 9 Upper piece 9c Lower pad retainer 9 12 Cylinder hole 13 Piston 14 Hydraulic chamber 15 Shim plate 15a: a face plate similar in shape to the back plate 8 15b: a locking claw piece 15c: an elastic claw piece 15d: an elastic claw piece 15e allowing a relative movement of the friction pad 6 and the shim plate 15 in the disk circumferential direction 15e: a protruding piece 15f L-shaped piece 15f consisting of bent piece 15g ... ear piece back part 15g ... bent piece 15h ... bent piece A ... rotation direction of disk rotor 2 Lt ... distance between rising pieces 9a, 9a Ls ... folding of shim plate 15 The distance Lp between the bent pieces 15g, 15g: the length of the side faces 8b, 8b of the lugs 8a, 8a, which is the length of the friction pad 6 in the circumferential direction of the disk Ht: the pad retainer 9 replacing the distance of the pad guide portion 3c in the disk radial direction the upper and lower pieces 9b, the distance Hs ... ears back portion 15f of 9c bent piece 15h, the 15h
Interval Hp: Length of ear piece 8a in the disk radial direction

Claims (2)

(57) [Scope of request for utility model registration] 1. A friction pad is arranged between two torque receiving surfaces with a torque receiving surface of a caliper bracket facing a side portion of a disk rotor, and a shim plate is attached to a back surface of a back plate of the friction pad. In a vehicle disk brake, a plurality of elastic claws are provided on the shim plate to allow relative movement of the shim plate and the friction pad in the disk circumferential direction, and the elastic claws are provided on the back of the friction pad. Attached to the board, said
A pair of bent pieces are placed on both ends of the shim plate
Projecting to face the training direction, the distance Lt between the torque receiving surfaces, spacing Ls of the pair of bent piece of the shim plate
And the length Lp of the friction pad in the disk circumferential direction,
A disc brake for a vehicle, wherein a relationship of Lt ≧ Ls> Lp is set. 2. A caliper bracket fixed to a vehicle body having a groove-shaped pad guide portion formed on a side portion of a disk rotor, and lugs protruding from both pad guide portions on both sides of a back plate of a friction pad. In the vehicle disk brake for suspending the friction pad and mounting a shim plate on the back surface of the back plate, the shim plate has a disk radial direction between the shim plate and the friction pad. A plurality of elastic claws are provided so as to project relative to each other, the elastic claws are engaged with a back plate of the friction pad, and are provided so as to cover a back surface of the ear pieces.
Inner and outer sides of the shim plate in the radial direction of the disk
At the same time, a pair of bent pieces
And a distance H in the disk radial direction of the pad guide portion.
t, the distance Hs between the pair of bent pieces of the shim plate, and the length Hp of the ear pieces in the disk radial direction, Ht ≧ Hs>
A disc brake for a vehicle, wherein the relationship is set to Hp.