JPH0643374U - Disc brakes for vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] While improving the durability of the shim plate, the pad contact noise generated during normal driving and braking is prevented as much as possible. [Structure] The shim plate 15 has a disc entry side and a delivery side,
A pair of elastic claw pieces 15d, 15d and L-shaped pieces 15e, 15e
And project. The shim plate 15 is attached to the friction pad 6 by sandwiching both side surfaces of the back plate 8 with the elastic claw pieces 15d and 15d so that the friction pad 6 and the shim plate 15 can relatively move in the disk circumferential direction. The rising piece 9a of the pad retainer 9,
Let 9t be the distance, and let Ls be the length of the bent pieces 15g, 15g that are the length of the shim plate 15 in the disk circumferential direction.
Ear pieces 8a having a length in the disc circumferential direction of the friction pad 6,
When the lengths of the side surfaces 8b and 8b of 8a are Lp, these are set to have a relationship of Lt ≧ Ls> Lp. L-shaped piece 15
The bent piece 15g of e is projected to the anti-lining side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake used in a traveling vehicle such as an automobile or a motorcycle, and particularly, a striking sound of a friction pad generated when the vehicle is traveling or braking is utilized by using a shim plate mounted on the back surface of the back plate of the friction pad. And a structure designed to prevent it as much as possible.

[0002]

[Prior art]

 For friction pads used for disc brakes, it is known that a shim plate made of a thin metal plate is attached to the back surface of the back plate to prevent brake squeal and uneven wear of the lining during braking. For example, there is one disclosed in Japanese Utility Model Publication No. 51-44071.

In this technique, the side surface of the shim plate in the circumferential direction of the disk is bent in the lining direction at the side of the back plate of the friction pad, and at least a part of the bent piece is elastically covered to form a back plate. Even if rust grows on the torque receiving surface, the friction pad does not lock due to rust by separating the side of the friction pad from the torque receiving surface of the pad guide formed on the caliper bracket. It is designed to move smoothly in the disc axial direction, and in effect, the bent piece of the shim plate is bent so that it elastically floats up from the torque receiving surface of the pad guide part, and It is said that the impact with the receiving surface is softened and the generation of tapping noise is prevented.

[0004]

[Problems to be solved by the device]

 When the braking action is performed in such a configuration, the friction pad is slid in the disc unwinding direction integrally with the shim plate by the braking torque generated by the sliding contact with the disc rotor, and the bent piece on the side surface of the shim plate is removed. It is sandwiched between the torque receiving surface on the disc feeding side and the back plate of the friction pad, and the entire braking torque of the friction pad is transmitted to the torque receiving surface through the bent pieces of the shim plate. As a result, not only is the shim plate damaged and durability is lost, but the bent pieces of the shim plate are permanently deformed and the elastic force disappears early, so not only during braking but also during normal running of the vehicle. Even in this case, the vibration of the seams of the paved road and the uneven road caused the friction pad to rattle integrally with the shim plate in the circumferential direction of the disk, which caused an unpleasant contact noise.

The present invention has been made in view of such circumstances, and an object of the present invention is to prevent the pad abutment noise generated during normal running or braking as much as possible while improving the durability of the shim plate. (EN) Provided is a disc brake for a vehicle capable of performing the above.

[0006]

[Means for Solving the Problems]

 According to the above-mentioned object, the first invention is such that the torque receiving surface of the caliper bracket is faced to the side portion of the disk rotor, the friction pad is disposed between both torque receiving surfaces, and the friction pad of the friction pad is provided. In a vehicle disc brake in which a shim plate is mounted on the back surface of a back plate, a plurality of elastic claw pieces that allow relative movement of the shim plate and the friction pad in the disc circumferential direction are projected on the shim plate, The elastic claw piece is attached to the back plate of the friction pad, and the distance Lt between the torque receiving surfaces, the disc circumferential direction length L s of the shim plate, and the disc circumferential direction length Lp of the friction pad are set. Is set in the relation of Lt ≧ Ls> Lp.

In the second invention, the caliper bracket fixed to the vehicle body is formed with groove-shaped torque receiving portions facing each other at the side portions of the disc rotor, and the friction pad is provided on both torque receiving portions. A disc brake for a vehicle in which ear pieces protruding from both sides of the back plate are locked to suspend the friction pad, and a shim plate is attached to the back surface of the back plate. A plurality of elastic claw pieces that allow relative movement in the radial direction of the disk are projected, the elastic claw pieces are attached to the back plate of the friction pad, and the distance Ht of the torque receiving portion in the disk radial direction is Inside the torque receiving portion, a disc radial direction length Hs of a back side portion of the shim plate provided over the back side of the ear piece and a disc radial direction length Hp of the ear piece are defined. , Ht ≧ Hs> Hp It has a feature.

[0008]

[Action]

 When the braking action is performed in the first configuration, the friction pad and the shim plate are dragged integrally in the disc unwinding direction by the braking torque generated by the sliding contact with the disc rotor, and the back plate first. Only the side surface of the shim plate projecting from the disc feeding side surface contacts the torque receiving surface on the disc feeding side, and then the friction pad causes the side surface of the back plate to contact the torque receiving surface due to the deformation of the elastic claw piece. .

In the second configuration, when the friction pad and the shim plate are lifted outward in the radial direction of the disc, first, only the back surface of the ear plate of the shim plate, which is wider than the ear plate of the back plate, is pressed. Then, the friction pad deforms the elastic claw piece of the shim plate, and the ear piece of the back plate contacts the disc radial direction outer peripheral side surface of the pad guide section.

In both configurations, the shim plate and the friction pad are thus brought into contact with the torque receiving surface of the pad guide portion or the outer surface in the radial direction of the disc in two stages, and the shim plate of the first stage is arranged. Since the stroke until contacting the torque receiving surface and the outer surface in the radial direction of the disk is short and the mass is light, the contact noise is small. Further, in the second stage, after the shim plate comes into contact with the torque receiving surface, the elastic claw pieces are deformed to reduce the load on the friction pad, and the friction pad comes into contact with the torque receiving surface or the outer peripheral surface in the radial direction of the disc. To reduce the contact noise of the friction pad. In addition, the braking torque of the friction pad is directly transmitted from the back plate to the torque receiving surface without a shim plate being sandwiched between them.

[0011] Further, in the first invention, in addition to a disc brake in which the ear piece of the back plate is locked to the pad guide portion of the bracket to support the friction pad, the friction pad is suspended by a hanger pin. It can also be applied to hanger pin type disc brakes.

[0012]

Embodiment A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The disc brake 1 includes a disc rotor 2 which rotates in a direction of an arrow A together with a wheel (not shown), a bracket 3 fixed to a vehicle body at one side of the disc rotor 2, and two brackets 3 provided on the bracket 3. The caliper 5 is supported by the slide pins 4 and 4 so as to be movable in the disc axial direction, and a pair of friction pads 6 and 6 are arranged opposite to each other on both sides of the disc rotor 2.

The bracket 3 is provided with a pair of caliper support arms 3 a, 3 a extending outside the disc rotor 2 in the disc axial direction. The tips of both support arms 3 a, 3 a are on the other side of the disc rotor 2. Part is connected by a tie bar 3b. The caliper support arms 3a, 3a are provided with groove-shaped pad guide portions 3c, 3c on both sides of the disc rotor 2 so as to face each other, and each friction pad 6 projects on both sides of the back plate 8. The ear pieces 8a, 8a are supported by the pad guide portions 3c, 3c via a pad retainer 9.

The caliper 5 is a two-piece split type in which the action portion side piece 5 a and the reaction portion side piece 5 b are connected by four connecting bolts 10. The action portion side piece 5 a is one of the disc rotors 2. The reaction portion side piece 5b is a reaction portion 5c disposed on a side portion, and the reaction portion 5d is disposed on the other side portion of the disc rotor 2 and the reaction portion 5c straddling the outside of the disc rotor 2. It is composed of a connecting bridge portion 5e. The above-mentioned slide pins 4 are attached to the mounting arms 5f and 5f projecting on both sides of the action portion 5a by the mounting bolts 11, and the caliper 5 attaches each slide pin 4 to the caliper support arm 3a. It is inserted into each of the pin holes 3d bored in and is supported so as to be movable in the disc axial direction as described above.

A cup-shaped piston 13 is housed in a cylinder hole 12 formed in the working portion 5 c by opening the disc rotor 2 side, and a hydraulic chamber 14 is provided between the cylinder hole 12 and the bottom portion of the piston 13. Is defined.

The hydraulic chamber 14 is connected to a known hydraulic master cylinder (not shown), and when the hydraulic liquid generated in the hydraulic master cylinder is supplied to the hydraulic chamber 14, the piston 13 causes the cylinder hole 12 to move. By moving forward, one friction pad 6 is pressed against one side surface of the disc rotor 2. Next, due to this reaction, the caliper 5 moves in the direction of the action portion 5c, and the reaction portion 5d pushes the other friction pad 6 against the other side surface of the disc rotor 2 to exert a braking action.

The friction pad 6 is constructed by adhering a lining 7 made of a friction material such as sintered metal and a metal back plate 8 to each other. A shim plate 15 is attached to the back surface of each back plate 8 so as to prevent squeaking of the brake generated during braking and uneven wear of the lining 7 as much as possible.

The shim plate 15 is formed by bending a thin metal plate having elasticity such as a stainless steel plate. The shim plate 15 has a similar shape to the back plate 8 and has a similar shape. A bifurcated locking claw piece 15b, a pair of elastic claw pieces 15c and 15c on the inner surface of the disk, and a pair of elastic claw pieces 15d and 15d on both sides of the disk entry and exit sides, respectively. It is provided so as to project laterally, and further L-shaped pieces 15e, 15e are provided under the elastic claw pieces 15d, 15d on the side surface. Each of the elastic claw pieces 15c, 15d is formed in an S shape, and each L-shaped piece 15e has an ear piece rear surface portion 15f protruding in parallel to the outside of the face plate 15a and an ear piece rear surface portion 15f. And a bent piece 15g protruding from the tip to the other side of the face plate 15a.

The shim plate 15 formed in this manner is such that the face plate 15a is brought into contact with the back surface of the main body portion of the back plate 8 and the back surface of the ear piece 8a is covered with the back surface portion 15f of the L-shaped piece 15e. Both side surfaces 8c and 8d of the plate 8 on the disk entry and exit sides are sandwiched by elastic claw pieces 15d and 15d, and the inner and outer side surfaces of the back plate 8 are also engaged with the locking claw pieces 15b and the elastic claw pieces 15c and 15d. It is mounted on the back surface of the back plate 8 while being sandwiched between c and c. As described above, the friction pads 6 and 6 with the shim plates 15 are suspended on both sides of the disc rotor 2 by locking the tabs 8a and 8a of the back plate 8 to the pad guide portions 3c and 3c. The back plate rear surface portion 15f of the L-shaped piece 15e slightly protrudes outward from the side surfaces 8b, 8b of the ear pieces 8a, 8a, and the respective bent pieces 15g are arranged so as to project 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 due to the bending of the elastic claw pieces 15d, 15d that elastically support both side surfaces of the back plate 8, and further the inner circumference of the back plate 8 is allowed. Due to the bending of the elastic claw pieces 15c, 15c that elastically hold the surface, relative movement in the disk radial direction is allowed.

On the other hand, the pad retainer 9 laid on the pad guide portion 3c is provided with a rising piece 9a so as to cover the torque receiving surface 3e which is the inner wall of the pad guide portion 3c. The intervals between the rising pieces 9a and 9a facing each other on one side and the other side of the disk rotor 2 are slightly wider than the lengths of the bent pieces 15g and 15g of the shim plate 15, and the compatibility rising pieces 9a and 9a are different from each other. The distance of 9a is Lt, the lengths of the bent pieces 15g, 15g having the length of the shim plate 15 in the disk circumferential direction are Ls, and the side surfaces of the ear pieces 8a, 8a having the length of the friction pad 6 in the disk circumferential direction. When the lengths of 8b and 8b are Lp, they are set to have a relationship of Lt ≧ Ls> Lp.

The present embodiment is configured as described above, and the bent piece 15g of the shim plate 15 has a rising edge of the ear piece 8a of the friction pad 8 and the pad retainer 9 from the relationship of Lt ≧ Ls> Lp. It is located between the piece 9a and is further projected from the face plate 15a in the anti-lining direction. When the braking action is performed as described above, the braking torque generated by the friction pad 6 and the shim plate 15 by the sliding contact with the disc rotor 2 causes the disc to move in the disc-outward direction and the disc-outward direction. Move to. In the dragging movement in the direction of the arrow A, the bent piece 15g of the shim plate 15 having a narrow gap with the rising piece 9a first comes into contact with the rising piece 9a, and then the elastic claw pieces 15d and 15d of the shim plate 15 are elastic. Due to the deformation, the side surface 8b of the back plate 8 on the disk feeding side contacts the rising surface 9a of the pad retainer 9.

In this embodiment, the shim plate 15 and the friction pad 6 are brought into contact with the rising pieces 9a of the pad retainer 9 in two steps in this manner. Since the stroke until coming into contact with the piece 9a is short and the mass is light, the contact noise can be suppressed to a low level. Further, in the friction pad 6 of the second stage, after the shim plate 15 contacts the rising piece 9a, the elastic claw pieces 15d, 15d are deformed to soften the moving speed of the friction pad 6, so that the rising piece 9a is not moved. The contact is buffered, and the contact noise of the friction pad 6 is suppressed to a low level.

In addition, the bent pieces 15g of the shim plate 15 are arranged so as to project in the anti-lining direction so that the shim plate 15 is not sandwiched between the back plate 8 and the rising pieces 9a. The braking torque of 6 is directly transmitted from the back plate 8 through the rising piece 9a of the pad retainer 9 to the torque receiving surface 3e of the pad guide portion 3c, and the elastic claw piece 15d of the shim plate 15 and the bending piece. Since there is no danger that 15g will be damaged or permanently deformed by the braking torque, not only when braking, but also when the friction pad 6 is rattled in the disk circumferential direction due to vibrations due to the joints and uneven roads of the paved road, Unpleasant contact noise can be kept extremely low for a long period of time.

Further, in the present embodiment, the L-shaped piece 15e is provided on the shim plate 15 so that the bent piece 15g at the tip is brought into contact with the rising piece 9a of the pad retainer 9. High rigidity can be obtained on the side surface. Furthermore, it is preferable to attach an elastic material such as rubber to the outer surface of the bent piece 15g that comes into contact with the rising piece 9a because the contact noise of the friction pad 6 can be further prevented.

4 and 5 show a second embodiment of the present invention, in which the shim plate 15 has an anti-lining on the outer side and the inner side of the disc rear portion 15f of the L-shaped piece 15e in the radial direction of the disk. Bending pieces 15h, 15h projecting in the direction are provided, and the other portions have the same configuration as that of the first embodiment.

Each of the bent pieces 15h is provided so as to be located outside of the outer side surface 8c and the inner side surface 8d of the ear piece 8a of the back plate 8 in the disk radial direction of the ear piece back surface 15f. The length of the bent pieces 15h, 15h, which is the length of the pad guide, is set to Hs, and the distance between the upper and lower pieces 9b, 9c of the pad retainer 9 laid on the outer side surface 3f and the inner side surface 3g of the pad guide portion 3c in the radial direction of the disc. When Ht is set and the length of the ear piece 8a in the radial direction of the disk is set to Hp, these are set to satisfy the relationship of Ht ≧ Hs> Hp.

The upper and lower bent pieces 15h and 15h of the shim plate 15 sandwich the outer side surface 8c and the inner side surface 8d of the ear piece 8a in the disk radial direction, and connect the upper bent piece 15h and the upper piece 9b of the pad retainer 9 to each other. A gap is set between them. When the braking action is performed from such a configuration, the friction pad 6 and the shim plate 15 are integrated in the disc feeding direction indicated by the arrow A and the disc outer peripheral direction by the braking torque generated by the sliding contact with the disc rotor 2. Move to.

Among the movements of the friction pad 6 and the shim plate 15, the dragging movement in the direction of the arrow A is caused by the side bent piece 15g of the shim plate 15 and the side surface 8b of the back plate 8 on the disc feeding side. However, similarly to the first embodiment, the rising piece 9a of the pad retainer 9 is brought into contact with the rising piece 9a in two steps to suppress the generation of the contact noise. Further, in the floating movement toward the outside of the disc, the upper side bent piece 15h of the shim plate 15 having a narrow gap with the upper piece 9b of the pad retainer 9 comes into contact with the upper piece 9b first, and then the shim plate 15 is moved. Due to the elastic force of the elastic claw piece 15c on the inner peripheral side of the disk, the outer surface 8c of the ear piece 8a in the disk radial direction contacts the upper piece 9b of the pad retainer 9.

In this way, in this embodiment, the contact noise in the radial direction of the disc can be suppressed to a low level, and the contact noise of the friction pad 6 floating to the outside of the disk can be suppressed to a minimum. Also, even when the friction pad 6 is rattled in the vertical direction due to the vibration of the seams of the paved road or the uneven road, as in the case of braking, the unpleasant contact noise can be suppressed to be extremely small for a long period of time. You can

In each of the above-described embodiments, the pad retainer is provided in the pad guide portion, but the present invention may omit the pad retainer. It is also possible to omit the bent piece of the shim plate used in the embodiment and directly contact the shim plate with the bracket.

[0032]

[Effect of device]

 The vehicle disc brake of the present invention comprises a shim plate mounted on the back surface of the back plate of the friction pad, and a plurality of elastic claw pieces which allow relative movement of the friction pad in the circumferential direction of the disc. The piece is attached to the back plate of the friction pad, and the distance Lt between the torque receiving surfaces of the bracket, the length Ls of the shim plate in the disk circumferential direction, and the length Lp of the friction pad in the disk circumferential direction are set to Lt ≧ By setting the relationship of Ls> Lp, it is possible to suppress the contact noise with the bracket to be as small as possible over a long period of time when the friction pad rattles in the disk circumferential direction.

Further, the braking torque of the friction pad is directly transmitted from the back plate to the torque receiving surface, and since the shim plate is not sandwiched between them, the shim plate is damaged by the braking torque or is permanently damaged. The durability of the shim plate can be improved without fear of deformation.

Further, a plurality of elastic claw pieces that allow relative movement in the disc radial direction with respect to the friction pad are projected on the shim plate, and the elastic claw pieces are engaged with and oppose the back plate of the friction pad. The distance Ht of the pad guide portion in the disc radial direction, the disc radial length Hs of the back side of the ear piece of the shim plate provided inside the pad guide portion and covering the back side of the ear piece, and By setting the length Hp of the earpiece in the radial direction of the disc to satisfy the relationship of Ht ≧ Hs> Hp, when the friction pad rattles in the radial direction of the disc, the contact noise with the bracket can be kept for a long time. It can be kept as small as possible.

[Brief description of drawings]

FIG. 1 is a partial 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 a 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 an essential part of a shim plate showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Bracket 3a ... Caliper support arm 3c ... Pad guide part 3d ... Pin hole 3e ... Torque receiving surface 3f ... Disc radial direction outer side surface of pad guide part 3c 3g ... Disc of pad guide part 3c Inner radial side surface 4 ... Slide pin 5 ... Caliper 5a ... Action side piece 5b ... Reaction section side piece 5c ... Action section 5d ... Reaction section 5e ... Bridge section 6 ... Friction pad 7 ... Lining 8 ... Back plate 8a ... Back Ear piece 8b of plate 8 ... Side surface of ear piece 8a 8c ... Outer side surface of ear piece 8a in radial direction of disk 8d ... Inner side surface of ear piece 8a in radial direction of disk 9 ... Pad retainer 9a ... Standing piece of pad retainer 9 9b ... Pad retainer 9 upper piece 9c ... Pad retainer 9 lower piece 12 ... Cylinder hole 13 ... Piston 14 ... Hydraulic chamber 15 ... Shim plate 15a ... Face plate similar in shape to the back plate 8b ... Locking claw piece 15c ... Elastic claw piece 15d ... Elastic claw piece 15e ... Allowing relative movement of the friction pad 6 and the shim plate 15 in the disk circumferential direction. L-shaped piece 15f including bent piece 15g ... rear portion of ear piece 15g ... bent piece 15h ... bent piece A ... rotation direction of disk rotor 2 Lt ... distance between rising pieces 9a and 9a Ls ... disk of shim plate 15 Circumferential length of bent pieces 15g, 15g Lp ... Length of friction pads 6 in the circumferential direction of ears 8a, Sides 8b of 8a, 8b Ht ... Disc radius of pad guide portion 3c The distance between the upper and lower pieces 9b and 9c of the pad retainer 9 in place of the distance in the direction Hs .. Disk radial length of the

Claims (2)

[Scope of utility model registration request] 1. A torque receiving surface of a caliper bracket is opposed to a side portion of a disk rotor, a friction pad is disposed between both torque receiving surfaces, and a shim plate is attached to a back surface of a back plate of the friction pad. In the vehicle disc brake, a plurality of elastic claw pieces that allow relative movement of the shim plate and the friction pad in the disc circumferential direction are provided on the shim plate, and the elastic claw pieces are provided on the back side of the friction pad. The distance Lt between the torque receiving surfaces, the length Ls of the shim plate in the disk circumferential direction, and the length Lp of the friction pad in the disk circumferential direction, which are attached to the plate, are in a relationship of Lt ≧ Ls> Lp. A disc brake for vehicles characterized by being set to. 2. A caliper bracket fixed to a vehicle body is provided with groove-shaped pad guide portions facing each other at a side portion of a disk rotor, and both pad guide portions have ear pieces protruding from both side portions of a back plate of the friction pad. In a vehicle disc brake in which the friction pad is suspended and a shim plate is mounted on the back surface of the back plate, the shim plate is attached to the shim plate and the friction pad in the disk radial direction. A plurality of elastic claw pieces that allow relative movement are projected, and the elastic claw pieces are engaged with the back plate of the friction pad. The distance Ht of the pad guide portion in the disk radial direction and the inside of the pad guide portion Then, the length Hs in the disk radial direction of the ear piece rear surface portion of the shim plate provided covering the back surface of the ear piece and the disk radial direction length Hp of the ear piece are expressed by Ht ≧ Hs> Hp Characterized by setting in a relationship Disc brakes for vehicles.