JPH0529546Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a disc brake, and particularly relates to a technique for suppressing brake squeal.

BACKGROUND ART A caliper has a cylinder bore and is disposed straddling the outer periphery of the disc rotor so that the opening of the cylinder bore faces one surface of the disc rotor. A piston fitted so as to protrude into a cylinder bore so as to face one surface, and a pad provided movably in a direction parallel to the axis of the disc rotor between the piston and the disc rotor; A disc brake is known in which braking is performed by pressing a pad against the disc rotor using the piston.

A problem with such disc brakes is that brake squeal occurs due to the pressing of the pads against the disc rotor.One example of a countermeasure for this noise is the use of pistons to dampen the vibrations of the pads during braking. It has been considered to insert a damper made of a rubber plate or the like between the pad and the pad.

Problem to be Solved by the Invention However, when a damper such as a rubber plate is inserted between the piston and the pad, the damper is repeatedly pressed by the piston with a relatively large pressing force during braking. If the damper is permanently deformed or damaged, there is a risk that the vibration damping function of the damper will be significantly impaired, and it is unavoidable that the installation space for the disc brake will increase by the amount of the damper. .

The present invention was developed against this background, and its purpose is to provide a damper for damping the vibration of the pad without being pressed by the piston, and to reduce the installation space of the disc brake. The object of the present invention is to provide a technology that prevents the increase of

Means for Solving the Problems In order to achieve the above object, the present invention provides a disc brake of the type described above, which includes an elastic body and a weight member integrally fixed to the elastic body.
A damper that damps vibrations of the pad by causing its weight member to vibrate via its elastic body in response to vibrations generated in the pad during braking,
It is characterized in that it is provided inside the piston.

Function and Effect of the Invention With this arrangement, the damper is provided inside the piston, and the weight member of the damper is vibrated via the elastic body of the damper as vibrations occur in the pad during braking. As the elastic body is elastically deformed as the member vibrates, the vibration of the pad is damped and brake squeal is suppressed, so the pressing force of the piston is not applied to the damper during braking, and the Permanent deformation or damage to the damper due to the pressing force of the piston can be eliminated, and the vibration damping function of the damper can be suitably maintained, and by providing the damper, an increase in the installation space for the disc brake can be avoided.

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

FIG. 1 is a diagram showing the main parts of a disc brake to which the present invention is applied, in which 10 is a disc rotor, 12 is a caliper, and 14 is a torque plate. The caliper 12 includes a cylinder portion 18 in which a cylinder bore 16 is formed, and the cylinder portion 1
A bifurcated claw part 2 extends integrally from 8 and faces the cylinder part 18 with the disc rotor 10 in between.
0, and the cylinder bore 16
A piston 22 having a cylindrical shape with a bottom is fitted inside the piston 22 so that the piston 22 can protrude toward one surface 24 of the disc rotor 10 with its open end facing the one surface 24 of the disk rotor 10 .

The torque plate 14 extends integrally from the fixed portion 26 and the portions of the fixed portion 26 located on the outer peripheral side of the disk rotor 12 on both sides in the circumferential direction of the disk rotor 10, and connects the fixed portion 26 with the disk rotor 10 in between. A pair of opposing opposing parts 28,
28 (only one shown) and their opposing parts 28, 2
8 and a reinforcing part 30 that connects and reinforces the parts 8 to each other. A pair of slide pins (not shown) are protruded from the fixed part 26 in a direction parallel to the axis of the disc rotor 10, and these slide pins are attached to both sides of the cylinder part 18 in the circumferential direction of the disc rotor 10, respectively. By being slidably fitted into a provided guide hole (not shown), the caliper 12 is supported so as to be able to float in a direction parallel to the axis of the disk rotor 10, and is placed astride the outer periphery of the disk rotor 10. There is.

The fixing portion 26 of the torque plate 14 has a back metal 3.
2 and a friction material 34 fixed thereto is supported between the piston 22 and the disc rotor 10 so as to be movable in a direction parallel to the axis of the disc rotor 10, and between the opposing parts 28, 28. A pad 38 similar to the pad 36 is supported between the claw portion 20 and the disc rotor 10 so as to be movable in a direction parallel to the axis of the disc rotor 10.

In this embodiment, a damper 44 is further provided integrally inside the piston 22. The damper 44 includes a cylindrical member 46, a weight member 48 disposed on the inner peripheral side of the cylindrical member 46, and is provided between the cylindrical member 46 and the weight member 48 and is fixed to both members by integral molding. The cylindrical member 46 is press-fitted to the inner circumferential surface of the piston 22 on the outer circumferential surface of the cylindrical member 46, so that the inner circumferential surface of the piston 22 is fitted in the axial direction. It is attached to the middle part. At this time, between both ends of the weight member 48 and the bottom surface and open end of the piston 22, there is a pad 3 that is generated during vibration or braking while the vehicle is running.
Predetermined intervals are ensured so that when the weight member 48 is vibrated with the vibration of the piston 6, the weight member 48 does not interfere with the bottom surface of the piston 22 and the back metal 32 of the pad 36. . The cylindrical member 46 is preferably cut out over the entire longitudinal length of a part of the circumferential direction, so that the elastic body 50 is compressed while being elastically deformed toward the inner circumference when press-fitted into the piston 22. This prevents the piston 22 from deforming during press-fitting. In this case, preferably, a stepped surface is provided on the inner peripheral surface of the piston 22, and after the cylindrical member 46 is press-fitted until it abuts against the stepped surface, the end of the cylindrical member 46 on the disk rotor 10 side By fitting a retaining ring to the inner peripheral surface of the piston 22 located at the cylindrical member 4
6 is more reliably prevented from moving relative to the piston 22 in the axial direction.

In the disc brake configured as described above, when hydraulic pressure is supplied to the liquid chamber 52, the piston 22 is pushed out from the cylinder bore 16, one pad 36 is pressed against the one surface 24 of the disc rotor 10, and the opposite side is pressed against the one surface 24 of the disc rotor 10. Calipa with power 1
2 is moved in the opposite direction to the protruding direction of the piston 22, and the other pad 38 is moved by the claw portion 20.
is pressed against the other surface 54 of the disc rotor 10. As a result, the disc rotor 10 is compressed by both pads 36 and 38, and braking is performed. During this braking, the pads 36 and 38 are vibrated, and the vibration of one pad 36 causes the weight member 48 of the damper 44 to vibrate via the piston 22, the cylindrical member 46 of the damper 44, and the elastic body 50. As the elastic body 50 is elastically deformed with the vibration of the weight member 48, the vibration of the pad 36 is effectively damped by the internal frictional force of the elastic body 50. The weight of the weight member 48, the material, hardness, wall thickness, etc. of the elastic body 50 are determined in advance in this way. Thereby, brake squeal that occurs due to vibration of the pad 36 is suitably suppressed.

According to this embodiment, the damper 44 is provided inside the piston 22, and the weight member 48 of the damper 44 is moved through the elastic body 50 of the damper 44 as vibrations occur in the pad 36 during braking. Since the vibration of the pad 36 is attenuated by being vibrated, and brake squeal is suppressed, the pressing force of the piston 22 is not applied to the damper 44 during braking, and the pressing force of the piston 22 is reduced. As a result, the elastic body 50 of the damper 44 is completely prevented from being permanently deformed or damaged, and the vibration damping function of the damper 44 is suitably maintained. There is no increase in space at all.

Furthermore, according to this embodiment, the heat transferred from the pad 36 to the piston 22 is not directly transferred from the piston 22 to the elastic body 50, but is transferred to the elastic body 50 via the cylindrical member 46. , there are advantages such as being able to reduce heat transfer from the piston 22 to the elastic body 50 to some extent.

In the above embodiment, the cylindrical member 46 of the damper 44 is not necessarily required, and the cylindrical member 46 may be omitted and the elastic body 50 may be directly fixed to the inner peripheral surface of the piston 22.

Further, in the above embodiment, the rubber elastic body 50
is used, but an elastic body made of resin may also be used.

Further, in the above-described embodiment, the damper 44 is fixed to the inner circumferential surface of the piston 22, but it does not necessarily have to be configured in this way. For example, a damper 56 as shown in FIG. It may be fixed to the pad 36. This damper 5
6 includes a ring-shaped weight member 58, a cylindrical member 60 disposed on the inner peripheral side of the weight member 58, and a cylindrical member 60 provided between the weight member 58 and the cylindrical member 60 and integrally molded into both members. A pin 64 protrudes from the back metal 32 of the pad 36.
It is fixed to the cylindrical member 60 by press fitting. In this case, as the pad 36 vibrates, the pin 64, the cylindrical member 60, and the elastic body 62
The weight member 58 is vibrated through the elastic body 6
2 is elastically deformed, the vibration of the pad 36 is attenuated, and the vibration characteristics of the pad 36 itself are changed by the pin 64 and the damper 56, so that brake squeal can be effectively suppressed. In this case, the cylindrical member 60 may be deleted and the elastic body 62 may be directly fixed to the pin 64, or the pin 64 may be attached to the piston 2.
It may be provided protrudingly from the bottom surface of 2 or the like.

Further, in the above embodiment, the damper 44 is provided only on one side of the pad 36, but in addition, a pin is provided protruding from the back metal 32 of the other pad 38, and the pin is connected to the damper 44 in the case shown in FIG. By fixing a damper similar to the above, it is also possible to suppress brake squeal caused by vibration of the pad 38 without using a damper such as a rubber plate.

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 diagram showing an example of a disc brake to which the present invention is applied, and is a sectional view showing the main parts. FIG. 2 is a diagram showing another example of the present invention,
2 is a diagram corresponding to the main part of FIG. 1. FIG. 10... Disc rotor, 12... Caliper,
16...Cylinder bore, 22...Piston, 24
... One side, 36 ... pad, 44, 56 ... damper, 48, 58 ... weight member, 50, 62 ... elastic body.

Claims (1)

[Claims for Utility Model Registration] A caliper having a cylinder bore and disposed straddling the outer periphery of the disc rotor so that the opening of the cylinder bore faces one surface of the disc rotor; a piston that is fitted so as to protrude into the cylinder bore such that its open end faces one surface of the disc rotor; and a piston that is movable in a direction parallel to the axis of the disc rotor between the piston and the disc rotor. A disc brake is provided with a pad provided therein, and braking is performed by pressing the pad against the disc rotor by the piston, the disc brake having an elastic body and a weight member integrally fixed thereto, the pad A disc brake characterized in that a damper is provided inside the piston to attenuate vibrations of the pad by causing the weight member to vibrate via the elastic body in response to vibrations occurring in the piston.