JPH0529536Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a caliper used in a disc brake, and particularly to a caliper that can suppress squealing during braking.

BACKGROUND TECHNOLOGY A piston is provided with a cylinder portion into which a piston is fitted so as to be protrusive, and a pawl portion that is integrally provided with the cylinder portion and faces the cylinder portion. A caliper for disc brakes is known that performs braking by applying narrow pressure to a disc rotor.

Problems to be Solved by the Invention By the way, during such braking, squeal may occur due to the friction pads pressing the disc rotor, but this squeal is caused by the rotation of the friction pads in the rotation direction of the disc rotor. It is known that this is likely to occur if the surface pressure on the side is higher than the surface pressure on the outlet side.

The present invention was developed based on this knowledge, and its purpose is to provide a caliper that can adjust the surface pressure of the friction pad in the direction of rotation of the disc rotor so as to suppress squeal during braking. It is about providing.

Means for solving the problem In order to achieve the above object, the present invention provides a caliper for a disk brake which comprises a cylinder portion into which a piston is fitted so as to be able to protrude, and a claw portion which is formed integrally with the cylinder portion and faces the cylinder portion, and which compresses a disk rotor via a pair of friction pads using the piston and claw portion, and which is characterized in that the entire pressing surface of the claw portion against one of the friction pads is made into a plane which inclines in a direction approaching the cylinder portion as it moves from the rotation-in side to the rotation-out side in the rotation direction of the disk rotor.

Function and Effect of the Invention By doing this, the pressing surface of the claw portion pressed by one of the pair of friction pads approaches the cylinder portion as it moves from the input side to the output side in the rotational direction of the disc rotor. Therefore, the pressing force of the friction pad against the rotational direction side of the disk rotor by the piston and the pawl portion, and the surface pressure of the friction pad on the rotational direction side of the disk rotor can be positively increased. Thereby, the surface pressure of the friction pad on the rotational direction side of the disc rotor can be made relatively low, and squealing during braking can be suppressed.

Moreover, since it is sufficient to simply incline the pressing surface of the pawl, the number of parts can be reduced compared to the case where a shim or the like is partially inserted between the friction pad and the pawl on the rotational direction side of the disc rotor. can be reduced.

In addition, since the entire pressing surface of the claw is flat, a protrusion may be provided on the pressing surface of the claw on the rotational direction side of the disc rotor, or a protrusion may be provided on the pressing surface of the claw on the rotational direction side of the disk rotor. When forming the pressing surface of the claw portion by machining, the machining can be performed easily and quickly, compared to the case where only a predetermined portion of the pawl is formed as an inclined surface.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, 10 is a caliper, 12 is a disc rotor, and 14 is a torque plate. Caliper 10 is disk rotor 12
The cylinder part 18 has a cylinder bore 16 that opens toward the cylinder bore 16, and a bifurcated claw part 20 that integrally extends from the cylinder part 18 and faces the opening side of the cylinder part 18. A piston 22 is slidably fitted into the opening so as to be able to protrude from the opening.

As shown in FIG. 2, the torque plate 14 has a fixed portion 2 fixed to a non-rotating member (not shown).
4, and a pair of opposing parts 26, 26 (only one shown) extending integrally from the fixed part 24 and facing the fixed part 24 with the disk rotor 12 in between. A pair of guide portions 28 and 30 provided on both sides of the cylinder portion 18 facing the circumferential direction of the disc rotor 12 are slidably fitted into a pair of slide pins (not shown) protruding from the cylinder portion 18, respectively. As a result, the caliper 10 is supported so as to be movable in a direction parallel to the axis of the disc rotor 12.

A pair of friction pads 28 and 30 are disposed between the piston 22 and the pawl 20 with the disc rotor 12 sandwiched between them. The other friction pad 3 is supported so as to be movable in a direction parallel to the axis of the rotor 12.
0 is supported by opposing portions 26, 26 of the torque plate 14 so as to be movable in a direction parallel to the axis of the disk rotor 12.

In the disc brake configured as described above, the liquid chamber 3 formed in the cylinder bore 16 is
When hydraulic pressure is supplied to the piston 2, the piston 22 is pushed out and one of the friction pads 28 touches the disc rotor 12.
While being pressed against one surface, the caliper 10 is moved in the opposite direction to the protruding direction of the piston 22 by the reaction force, and the other friction pad 30 is pressed against the other surface of the disc rotor 12 by the claw portion 20, thereby, The disc rotor 12 is compressed and braking is performed.

In this embodiment, as shown in FIG. 40, from the input side (lower side in Figure 1) to the output side (upper side in Figure 1) in the rotation direction of the disk rotor 12 (direction A in Figure 1) when the vehicle moves forward. It is a plane that is inclined in a direction approaching the cylinder portion 18. In this case, a plane b perpendicular to the axis a of the cylinder portion 18 (indicated by a dashed line in FIG. 1) and a pressing surface 3
The angle θ formed by 8 and 40 with the plane is usually set to a relatively small angle of about several degrees.

As described above, according to this embodiment, the friction pad 30
The pressing surfaces 3 of the claws 34 and 36 of the claw portion 20 are pressed by
8 and 40 are inclined in a direction closer to the cylinder portion 18 from the rotation side to the rotation side of the disc rotor 12 when the vehicle moves forward, so that the piston 22 and friction pads 28, 30 by the claw portion 20
It is possible to actively increase the pressing force of the friction pads 28, 30 on the rotational direction side of the disc rotor 12 and the surface pressure of the friction pads 28, 30 on the rotational direction rotational side of the disc rotor 12.
The surface pressure on the rotational direction side of the zero disc rotor 12 can be made relatively low. In this way, the disc rotor 12 of the friction pads 28 and 30
Squeal during braking is effectively suppressed because the surface pressure on the turning side in the rotational direction is reduced compared to the conventional system.

Further, according to this embodiment, the claws 34 of the claw portion 20,
Since the above effect can be obtained by simply tilting the pressing surfaces 38 and 40 of 36, a shim or the like is interposed between one of the bifurcated claws located on the exit side in the disk rotor rotation direction and the friction pad. It has the advantage of requiring fewer parts compared to the case where it is inserted.

Further, according to this embodiment, the claws 34 of the claw portion 20,
Since the pressing surfaces 38 and 40 of 36 are all flat, it is possible to provide a protrusion on the pressing surface of one of the bifurcated pawls located on the rotational direction side of the disk rotor, or When forming the pressing surfaces 38, 40 of the pawls 34, 36 by machining, there is an advantage that the machining can be done easily and quickly, compared to the case where only the pressing surfaces of the pawls are sloped surfaces.

In the above embodiment, the claw portion 20 is formed into a bifurcated shape having a pair of claws 34 and 36.
It may consist of only one claw, or it may consist of three or more claws.

Further, in the above embodiment, the caliper 10 is supported by a pair of slide pins, but the present invention can also be applied to a type of caliper supported by a single slide pin.

Further, in the above embodiment, the friction pads 28, 3
The braking torque generated at 0 is configured to be directly received by the torque plate 14, but the braking torque of the friction pad 30 is indirectly received by the torque plate 14 via the claw portion 20 etc. It may be configured as follows.

In addition, various changes may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a view of the caliper shown in FIG. 2 viewed from the axial center side of the disc rotor. FIG. 2 is a sectional view showing an assembled state of a disc brake caliper to which the present invention is applied. 10... Caliper, 12... Disc rotor,
18... Cylinder part, 20... Claw part, 22... Piston, 28, 30... Friction pad, 38, 40
...pressure surface.

Claims (1)

[Claims for Utility Model Registration] A cylinder portion into which a piston is fitted so as to be protrusive, and a claw portion that is integrally provided with the cylinder portion and faces the cylinder portion; In a disc brake caliper of the type that compresses a disc rotor through a pair of friction pads, the entire pressing surface of the claw portion against one of the friction pads is moved from the input side to the output side in the rotational direction of the disc rotor. A caliper for a disc brake, characterized in that the caliper has a single plane that is inclined in a direction closer to the cylinder portion as it goes toward the cylinder portion.