JPH04258532A - Shim for prevention of disc brake noise - Google Patents

Abstract

PURPOSE:To provide a shim which demonstrates an effective dumping function against vibrations both in the rotor axis direction and in the rotor rotation direction, which ocuurs when brake is applied. CONSTITUTION:A shim 10, which is fitted between a back plate 22a of a pad 22 and a pressed member, is composed of a first shim plate, which is arranged along the back plate 22a of the pad 22 and fitted and retained to a mounting bracket 21 at both ends, and a second shim plate 12, which is stuck to the back plate 22a of the pad 22 and its part held through the medium of rubber sheets 13, 14 from both sides exclusive of both ends of the first shim plate 11.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is directed to a disc brake that is installed between the back metal of a pad that is assembled and supported by a mounting bracket and a pressing member that presses it, in order to prevent squeal that occurs during braking in a disc brake. Regarding anti-squeal shims.

0002

[Prior Art] Various types of sims of this type have been proposed in the past, one of which is Jikken 1-33871.
As shown in the publication, it is constructed by overlapping a stainless steel thin plate that comes into contact with a pressing member and is pressed, and a metal thin plate whose front and back sides are coated with rubber and whose rubber surfaces are coated with grease. There is one that is attached to the backing metal of the pad, and another one is the Utility Model No. 57-4423.
As shown in Japanese Patent No. 2, there is a shim plate which is constructed of a main shim plate coated with rubber and an auxiliary shim plate made of a metal plate superimposed on the main shim plate, and is attached to a pressing member.

0003

[Problems to be Solved by the Invention] The above-mentioned conventional shims exhibit an effective damping function against vibrations (high-frequency vibrations) in the pad pressing direction, that is, the rotor axial direction, among the vibrations generated during braking. It does not effectively dampen vibrations in the rotational direction of the rotor (low-frequency vibrations). For this reason, it is not possible to sufficiently prevent brake squeal caused by vibrations in the rotational direction of the rotor. The present invention has been made to address the above-mentioned problems, and an object of the present invention is to provide a shim that effectively exhibits a damping function against both vibrations in the axial direction of the rotor and vibrations in the rotational direction of the rotor that occur during braking. It is said that

0004

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention brakes the rotor by pressing a pad assembled and supported by a mounting bracket toward the rotor using a pressing member. In the disc brake, a shim interposed between the back metal of the pad and the pressing member is provided with a first shim disposed along the back metal of the pad and held in engagement with the mounting bracket at both ends. The pad is composed of a shim plate and a second shim plate that is fixed to the back metal of the pad and holds the first shim plate except for both ends thereof from both the front and back sides via rubber sheets.

[0005]

[Operations and Effects of the Invention] In the shim according to the present invention, each rubber sheet sandwiched between the first shim plate and the second shim plate deforms viscoelastically in response to vibrations in the axial direction of the rotor that occur during braking. The rubber sheet effectively exerts a damping function and creates a large friction force between the first shim plate, which moves almost integrally with the mounting bracket, and the second shim plate, which moves almost integrally with the pad, against vibrations in the rotational direction of the rotor. acts to effectively exert the damping function. Therefore, vibrations in the axial direction of the rotor and vibrations in the rotational direction of the rotor that occur during braking are accurately reduced, and the synergistic effect of reducing both vibrations can significantly reduce squealing during braking.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an assembled state of a shim 10 according to the present invention, which includes an inner pad 22 assembled and supported by a mounting bracket 21, and a piston 23 that presses the inner pad 22 toward the rotor 20. and between the outer pad 24 assembled and supported by the mounting bracket 21 and the arm portion 25a of the caliper 25 that presses the outer pad 24 toward the rotor 20. It is composed of a plate 12 and rubber sheets 13 and 14 interposed between these shim plates 11 and 12.

As shown in FIG. 3, the first shim plate 11 is a plate having bent claws 11a at both ends.
When assembled, the pads are arranged along the back metals 22a and 24a of each pad 22 and 24, and the claws 11a at both ends engage and hold the mounting bracket 21 as shown in FIG. Rubber sheets 13, 1 on both front and back sides
4 is attached. On the other hand, as shown in FIG. 4, the second shim plate 12 is a plate bent into an inverted U shape, and is fixed on one side to the back metals 22a and 24a of each pad 22 and 24. During assembly, as shown in FIGS. 1 and 2, the first shim plate 11 except for both ends is held together with the rubber sheets 13 and 14 from both the front and back sides. In addition, in this embodiment, as shown in FIG. 1, the mounting bracket 21 and each pad 22, 2
A corrugated leaf spring 30 is interposed between the back metals 22a and 24a of No. 4 to urge each pad 22 and 24 in the rotor rotational direction.

In this embodiment configured as described above, each rubber sheet 1 sandwiched between the first shim plate 11 and the second shim plate 12 resists vibrations in the axial direction of the rotor that occur during braking.
3 and 14 are each viscoelastically deformed to effectively exhibit a damping function, and the corrugated plate spring 30 exhibits a buffering function against vibrations in the rotational direction of the rotor. a second shim plate 12 that moves substantially integrally with the first shim plate 11 and each pad 22, 24;
A large frictional force is exerted by the rubber sheets 13 and 14 between them, thereby effectively exerting a damping function. Therefore, vibrations in the axial direction of the rotor and vibrations in the rotational direction of the rotor that occur during braking are accurately reduced, and the synergistic effect of reducing both vibrations can significantly reduce squealing during braking.

In the above embodiment, the mounting bracket 21 and the back metals 22a and 24 of each pad 22 and 24 are
Although the present invention was implemented by interposing a corrugated leaf spring 30 between the pads 22 and 24 in the rotor rotation direction between a, the corrugated leaf spring 30 was integrated with the claw portion 11a of the first shim plate 11. It is also possible to implement the present invention without the corrugated leaf spring 30. Furthermore, the present invention may be carried out by pasting a rubber sheet on the inside of the second shim plate 12;
Alternatively, it is also possible to practice the present invention by pasting the rubber sheets 13 and 14 on the inside of the second shim plate 12.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view of essential parts showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view showing an embodiment of the present invention.

3 is a partially cutaway perspective view showing the first shim plate and rubber sheet shown in FIGS. 1 and 2. FIG.

4 is a partially cutaway perspective view showing the pad and second shim plate shown in FIGS. 1 and 2. FIG.

[Explanation of symbols]

10...Shim, 11...First shim plate, 12...Second shim plate, 1
3, 14... Rubber sheet, 20... Rotor, 21... Mounting bracket, 22, 24... Pad, 22a, 24
a... Back metal, 23... Piston (pressing member), 25... Caliper, 25a... Arm portion (pressing member).

Claims (1)

[Claims] 1. A disc brake that brakes a rotor by pressing a pad assembled and supported by a mounting bracket toward the rotor with a pressing member, wherein there is a space between the back metal of the pad and the pressing member. The interposed shim is arranged between a first shim plate disposed along the backing metal of the pad and engaged and held at both ends by the mounting bracket, and a first shim plate fixed to the backing metal of the pad and attached to the first shim plate. A shim for preventing squeal of a disc brake, characterized in that the shim is constituted by a second shim plate which is sandwiched between the front and back sides via a rubber sheet except for both ends.