JPH074455A - Disc brake - Google Patents

Abstract

(57) [Summary] [Structure] Wear sensor 18 provided on outer pad 7
The vibrating piece portion 22 that connects the mounting portion 17 to the surface portion 16 of the outer pad 7 and the contact portion 24 that comes into contact with the disc 3 to generate abnormal noise when the pad is worn is arranged substantially along the disc circumferential direction. . [Effect] Since the vibrating piece portion 22 of the wear sensor 18 extends substantially in the circumferential direction of the disk, the wear sensor 18 is irrespective of the size of the gap between the outer pad 7 and the cylindrical portion 2 of the disk rotor 4. It can be installed.

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 braking a vehicle or the like.

[0002]

2. Description of the Related Art In a disc brake used for braking a vehicle or the like, a pair of pads arranged to sandwich the disc and a piston disposed in the disc axial direction while being arranged on the opposite side of the disc of one pad. It has a cylinder part slidably fitted along it and a claw part arranged on the opposite side to the disc of the other pad, and the piston is protruded toward the claw part to sandwich both pads with the claw part and the piston. There is a caliper that is pressed to contact the disk, and a wear sensor is provided on the other pad described above (Japanese Utility Model Laid-Open No. 5-12778). This wear sensor is parallel to the mounting portion mounted on the center of the pad-side surface of the pad and the pad-side surface of the pad, and extends substantially from the mounting portion to the end surface of the pad on the inner side in the disk radial direction. A vibrating bar portion extending in a V shape, and a tip of the vibrating bar portion, which is located between the end surface of the pad on the inner side in the disk radial direction and the cylindrical portion of the disk rotor, and projects in the disk direction. The pad has a contact portion, and when the pad wears, the contact portion comes into contact with the disk to generate an abnormal sound, thereby recognizing the wear of the pad.

[0003]

In this disc brake, as described above, the vibrating reed portion of the wear sensor extends to the end face of the pad on the inner side in the disc radial direction, and the contact portion from the tip end to the contact portion. Since it is located between the end surface and the cylindrical portion of the disc rotor and protrudes in the disc direction,
If the gap between the pad and the cylindrical portion of the disc rotor is extremely narrow, the contact portion of the wear sensor cannot be interposed between the end surface of the pad and the cylindrical portion of the disc rotor, and the wear sensor itself must be attached. There was a problem that I could not. Therefore, an object of the present invention is to provide a wear sensor on the pad on the claw side, and
It is an object of the present invention to provide a disc brake that can be attached to an extremely narrow gap between the pad and the cylindrical portion of the disc rotor.

[0004]

In order to achieve the above object, a disk brake according to claim 1 of the present invention comprises a pair of pads arranged to sandwich the disk, and one pad opposite to the disk. A cylinder portion into which the piston is slidably inserted along the disc axial direction and a claw portion arranged on the opposite side to the disc of the other pad, and the piston is arranged in the claw portion direction. A caliper for holding and pressing both pads by these claws and a piston by making them protrude so as to contact the disk, and the other pad, a mounting part to be mounted on the claw side surface of the pad, A vibrating piece portion extending from the mounting portion to a side edge portion of the pad substantially along the disc circumferential direction, and protruding in a disc direction from a tip of the vibrating piece portion along a side edge portion of the pad. Disc brakes, wherein the wear sensor is provided with a that contacts.

In addition to the above, the disc brake according to a second aspect of the present invention further comprises a vibrating piece portion of the wear sensor from a position inside the mounting portion in the disc radial direction to a surface portion of the other pad. It is characterized in that it is erected so as to form a predetermined angle.

[0006]

According to the disc brake of the first aspect of the present invention, the vibration piece portion of the wear sensor extends from the mounting portion to the side edge portion of the pad substantially along the circumferential direction of the disc, and the contact portion extends from the tip thereof. The wear sensor can be attached regardless of the size of the gap between the pad and the cylindrical portion of the disk rotor because it projects in the disk direction along the side edge of the pad.

Further, according to the disc brake of the second aspect of the present invention, in addition to the above, the vibration piece portion of the wear sensor is provided from the inner side of the mounting portion in the disc radial direction.
Since it is erected so as to form a predetermined angle with respect to the surface of the pad, the rigidity of the vibrating piece is improved, and the area occupied by the surface of the vibrating piece can be reduced. The degree of freedom of is increased.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A disc brake according to an embodiment of the present invention will be described below with reference to FIGS. The disc brake 1 according to the present embodiment includes a disc rotor 4 including a substantially cylindrical rotor hat portion (cylindrical portion) 2 and a disc 3 having a circular plate with a hole provided on one side of the rotor hat portion 2. A carrier 6 fixed to the non-rotating portion of the vehicle, and a disc axial direction with the disc 3 sandwiched between the carrier 6 (direction orthogonal to the plane of FIG. 1).
An outer pad 7 and an inner pad (not shown) slidably supported on both ends, and both ends of the carrier 6 in the disc circumferential direction (left and right direction in FIG. 1) are slidably supported in the disc axial direction. It is mainly composed of a caliper 8.

The caliper 8 is arranged opposite to the disk 3 of the inner pad (not shown) so as to oppose to the disk 3 and the cylinder portion (not shown) along the disk axial direction, and is arranged opposite to the disk 3 of the outer pad 7. It has a claw part (reaction part) 9 and a connecting part 10 located outside the disk 3 in the radial direction and connecting the cylinder part and the claw part 9. A piston (not shown) is slidably fitted in the cylinder portion. This piston projects in the direction of the claw portion 9 by the hydraulic pressure of the brake fluid introduced into the cylinder portion, thereby sandwiching the inner pad and the outer pad 7 with the claw portion 9 and pressing them in the direction of the disc 3. ing. As shown in FIG. 2, the outer pad 7
Is a backing metal 12 and a friction material 1 fixed to one surface of the backing metal 12.
3 and the back metal 12 has a disk circumferential direction (see FIG.
As shown in FIG. 1, both ends in the left-right direction) are supported by a carrier 6 via a pad guide 14 so as to be slidable along the disc axial direction. A shim 15 is provided on the opposite side of the backing metal 12 from the friction material 13.
Is provided.

Further, in this embodiment, the surface portion 16 of the back metal 12 of the outer pad 7 opposite to the friction material 13 is formed.
A wear sensor 1 integrally formed from a metal plate material
8 is attached. The wear sensor 18 has a side on the inner side in the disc radial direction that is caulked to a caulking portion 19 provided at a predetermined position in the center of the back metal 12 in the disc circumferential direction and on the inner side in the disc radial direction (front side in FIG. 2). A mounting surface portion 20 having a long, substantially isosceles trapezoidal shape is provided, and both mounting edges of the mounting surface portion 20 in the disk circumferential direction are raised at a predetermined angle with respect to the surface portion 16, and the mounting portion 17 together with the mounting surface portion 20. And a base end portion 21 constituting the base end portion 21 and an inner end position of the base end portion 21 in the disc radial direction, which are erected substantially along the disc circumferential direction and at a predetermined angle (for example, 90 °) with respect to the surface portion 16.
Side edge portion 2 of back metal 12 at a predetermined position in the disk circumferential direction
Resonator piece 22 extending up to 3 and each resonator piece 2
2 is bent at a predetermined angle along the side edge portion 23 of the backing metal 12 from the extending tip of the backing 2 and is locked to the side edge portion 23, and protrudes a predetermined amount from the backing metal 12 to the friction material 13 side (disk 3 direction). And a contact portion 24 that operates. The wear sensor 18 is configured to generate a strange noise when the outer pad 7, that is, the friction material 13 is in contact with the disk 3 when the outer pad 7 is worn, and recognize the wear of the outer pad 7. The sound generated by the contact portion 24 is increased.

According to the disc brake 1 of the present embodiment having such a configuration, the vibration piece portion 22 of the wear sensor 18 has the outer pad 7 extending substantially from the mounting portion 17 along the disc circumferential direction.
Of the outer pad 7, the contact portion 24 projects in the disc direction along the side edge portion 23 of the outer pad 7, so that the size of the gap between the outer pad 7 and the rotor hat portion 2 of the disc 3 can be reduced. Regardless of the wear sensor 18
Can be installed. And usually the outer pad 7
Has a rectangular shape whose length in the circumferential direction is larger than that in the radial direction of the disc, so that the length from the mounting portion 17 to the vibrating bar portion 22 can be made larger than that in the description of the conventional example described above, and The degree of freedom of adjustment increases. Further, since the vibrating piece portion 22 of the wear sensor 18 is erected from the inner end position of the mounting portion 17 in the disc radial direction with respect to the surface portion 16 of the outer pad 7, the vibrating piece portion 22 of the vibrating piece portion 22 is erected. The rigidity is improved. Therefore, when the disk comes into contact, the wear sensor 18 can generate a vibration sound of a higher frequency, so that it can be clearly distinguished from other noise generated from the vehicle.

Further, for the same reason, the vibrating piece 22
The area occupied by the surface portion 16 can be reduced. Therefore, the degree of freedom in design such as increasing the size of the claw portion 9 is increased, and a large pressing area of the claw portion 9 against the surface portion 16 of the outer pad 7 is secured so as to avoid interference with the vibrating piece portion 22. it can. In other words, the surface portion 1 of the claw portion 9
In order to secure the pressing area against 6, the amount of extension of the claw portion 9 inward in the disk radial direction is increased, and the tip of the claw portion 9 and the inner side of the rotor hat portion 2 or the claw portion 9 in the disk radial direction. Although the clearance between the carrier 6 and the outer beam (not shown) provided in the carrier 6 becomes small,
With the above configuration, the vibrating piece 22 of the wear sensor 18 can be inserted into this small gap. Therefore, it is possible to prevent the occurrence of brake squeal, the occurrence of judder, the increase in pedal stroke, and the like. And
Even when a small caliper having a small pad area is adopted, the wear sensor can be provided on the outer pad. Further, since the wear sensor is provided on the outer pad side, it is not necessary to purposely extend or set other members, so that cost increase can be suppressed as much as possible.

The shape of the wear sensor 18 is not limited to the above, and various shapes can be adopted. For example, as shown in FIG. 3, the trapezoidal mounting surface portion 20 is not provided with base end portions at both end edges in the disk circumferential direction, but as shown in FIG.
Providing a base end portion 26 raised to form a predetermined angle with respect to the second surface portion 16 and extending from both ends of the base end portion 26 in the disc circumferential direction to the side edge portions 23 of the backing metal 12 in the disc circumferential direction. It is also possible to integrally provide the vibrating piece portion 22 so as to do so. Further, the vibrating piece portion and the contact portion do not necessarily have to be a pair, and may be provided only on one side.

[0014]

As described in detail above, the first aspect of the present invention
According to the described disc brake, the vibration piece portion of the wear sensor extends from the mounting portion to the side edge portion of the pad along the substantially disc circumferential direction, and the contact portion extends from the tip to the side edge portion of the pad. Since it projects in the direction, the wear sensor can be attached regardless of the size of the gap between the pad and the cylindrical portion of the disk rotor.

According to the disc brake of the second aspect of the present invention, in addition to the above, the vibrating reed portion of the wear sensor is provided from the inner side of the mounting portion in the disc radial direction.
Since the pad is erected at a predetermined angle with respect to the surface of the pad, the following effects can be obtained. Since the rigidity of the vibrating piece of the wear sensor is improved and a higher-frequency vibrating sound can be generated when the disk comes into contact, it can be more reliably distinguished from other noise generated from the vehicle. Since the area occupied by the vibrating piece with respect to the surface can be reduced, the degree of freedom in design such as increasing the size of the claw increases, and
Of the claw set to avoid interference with this vibrating piece,
Since a large pressing area for the pad can be secured, it is possible to prevent the squeal of the brake, the occurrence of judder, the increase of the pedal stroke, and the like. Further, even when a small caliper having a small pad area is adopted, the wear sensor can be provided on the pad on the claw portion side.

[Brief description of drawings]

FIG. 1 is a front view showing a disc brake according to an embodiment of the present invention.

FIG. 2 shows a disc brake according to an embodiment of the present invention,
It is a perspective view showing a pad and a wear sensor.

FIG. 3 is a perspective view showing a pad and a wear sensor of a disc brake according to another embodiment of the present invention.

[Explanation of symbols]

 1 Disc Brake 3 Disc 7 Outer Pad 8 Caliper 9 Claw 16 Surface 17 Mounting Part 18 Wear Sensor 22 Vibration Piece 23 Side Edge 24 Contact Part

Claims (2)

[Claims] 1. A pair of pads disposed with a disc sandwiched between them, a cylinder portion disposed on the opposite side of the disc of one pad and having a piston slidably fitted in the disc axial direction, and the other. And a caliper that has a claw portion arranged on the opposite side of the disc of the pad of FIG. 1 and projects the piston in the direction of the claw portion to clamp and press both pads with the claw portion and the piston to contact the disc. The other pad has an attachment portion attached to the surface of the pad on the side of the claw portion, and a vibrating piece portion extending from the attachment portion to a side edge portion of the pad along a substantially disc circumferential direction. When,
A disc brake, comprising: a wear sensor having a contact portion protruding from the tip of the vibrating piece along the side edge of the pad in the disc direction. 2. A vibrating piece portion of the wear sensor is erected from the inner side position of the mounting portion in the disk radial direction so as to form a predetermined angle with respect to the surface portion of the other pad. The disc brake according to claim 1.