KR19990019133U - Noise reduction structure of disc brake - Google Patents

Abstract

The present invention relates to a noise reduction structure of a disc brake, wherein a separate auxiliary core member is attached to a shim member mounted between an outer pad of the caliper and an inner wall of the housing, so that the inner / outer pad of the disc rotor contacts the leading side of the disc rotor during braking. The purpose is to reduce the squeal noise by dropping the surface pressure.

The present invention for achieving the object described above, the hub assembly (1) mounted on the knuckle side, the disk rotor (2) rotated in combination with the hub assembly (1), and the disk rotor (2) of A caliper installed with a piston (5) receiving hydraulic pressure when braking to an outer circumferential surface and inner / outer pads (6, 7) that come into contact with the disc rotor (2) and exert a braking force according to the pressure of the piston (5). In the disc brake composed of (3), a thin core member (9) interposed between the outer pad (7) and the inner wall of the housing (4) is a separate beam to the front surface in contact with the outer pad (7). When the braking member 10 is joined to each other, the padding side surface pressure of the pad is not greater than the trailing side surface pressure.

Description

Noise reduction structure of disc brake

The present invention relates to a disc brake, and in particular, a separate auxiliary core member is provided in the core member interposed between the pad and the inner wall of the housing to reduce squeal noise caused by uneven surface pressure distribution of the pad in the caliper during braking. The present invention relates to a noise reduction structure of a disc brake that is capable of reducing squeal noise generated during braking.

Generally, a vehicle includes a brake device for arbitrarily decelerating or stopping a vehicle speed according to a driver's needs while driving. Such a brake device is largely divided into a mechanical and a hydraulic type, and a hydraulic brake device links a driver's operating force. (B) an operating mechanism for transmitting in an increased state using hydraulic pressure, a hydraulic generating mechanism for generating hydraulic pressure under the force of the operating mechanism, and a brake mechanism for receiving a hydraulic pressure generated from the hydraulic generating mechanism and generating a braking force on the wheels; It consists of.

Meanwhile, in the hydraulic braking device as described above, the disc brake is a braking device that generates a braking force by bringing a pad into close contact with the rotating disc rotor. Such a disc brake is formed on the outer circumferential surface of the knuckle-side spindle as shown in FIG. 1. Hub assembly (1) that is mounted and rotated, disc rotor (2) which is coupled to the hub assembly (1) by screwing and rotates together, and caliper which is installed to surround the outer circumferential surface of one side of the edge of the disc rotor (2) It consists of (3).

As shown in FIG. 2, the caliper 3 has a housing 4 forming an external shape, a piston 5 mounted inside the housing 4 and pressurized by hydraulic pressure during braking, and the piston ( According to the pressure of 5), the inner and outer pads 6 and 7 are configured to generate a frictional force for braking by pressing a portion of the edge of the disc rotor 2 from the outside and the inside, respectively.

In the drawing, reference numeral 8 denotes a sealing material.

Therefore, the disc brake configured as described above, when the piston (5) in the caliper (3) is pressurized by the braking pressure oil during braking, the piston (5) moves the inner pad (6) toward the disc rotor (2) As a result, the outer pad 7 also comes in contact with the outer circumferential surface of the disc rotor 2 to pressurize the disc rotor 2, thereby preventing rotation of the disc rotor 2 which rotates together with the hub assembly 1. Braking is achieved.

However, in the disc brake type braking device as described above, when braking, the disk rotor 2 comes into contact with the inner / outer pads 6 and 7 pressurized by the braking pressure oil supplied, and squeal noise together with the frictional heat. In order to reduce the squeal noise caused during braking, many improvements have been made in the related art. As a part thereof, a thickness between the outer pad 7 and the inner wall of the housing 4 is increased. By embedding the thin core member 9, the squeal noise generated during braking has been reduced.

However, despite braking with the core member 9 embedded between the outer pad 7 and the inner wall of the housing 4 as described above, the effect of reducing the squeal noise was insufficient. Measurement of the surface pressure of the inner / outer pads 6 and 7 in friction with the disk rotor 2 resulted in a result as shown in FIG. 5, that is, the inner / in contact with the leading side of the disk rotor 2. It has been found that the surface pressure of the outer pads 6, 7 is greater than the surface pressure of the inner / outer pads 6, 7 in contact with the trailing side.

Therefore, it was found that reducing the leading surface pressure of the inner / outer pads 6 and 7 which are in contact with the disc rotor 2 during friction during braking is a major factor in reducing the squeal noise.

The present invention is conceived in view of the above, the inner and outer pads in contact with the leading side of the disc rotor during braking by attaching a separate auxiliary core member to the core member mounted between the outer pad in the caliper and the inner wall of the housing It is an object of the present invention to provide a noise reduction structure of a disc brake that can reduce the squeal noise by lowering the surface pressure.

1 is an exploded perspective view showing the configuration of a conventional disc brake device;

Figure 2 is an exploded perspective view showing the configuration of the caliper of Figure 1,

3 is a partial cutaway view showing the inside of the caliper shown in FIG.

4 is a front view and a side view thereof of the core member of FIG.

Figure 5 is a state diagram showing the surface pressure distribution of the pad during conventional braking,

6 is a front view and a side view of the core member according to the present invention,

Figure 7 shows the surface pressure distribution of the pad at the time of braking while mounting the core member of the present invention

It is a state figure shown.

<Description of Symbols for Main Parts of Drawings>

1-hub assembly 2-disc rotor

3-caliper 4-housing

5-piston 6-inner pad

7-outer pad 8-sealing material

9-core member 10-secondary core member

The present invention for achieving the above object is a disk rotor that rotates together with the hub assembly, the inner / outer pads in close contact with both sides of the disk rotor to generate a friction force, and the inner / outer pads toward the disk rotor In a disc brake of an automobile composed of a piston that is hydraulically pushed and a caliper having a built-in inner and outer pad, a thin core member interposed between the outer pad and the inner wall of the housing is brought into contact with the outer pad. A separate auxiliary core member is joined so that the padding side surface pressure is not greater than the trailing side surface pressure during braking.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 6 is a front view and a side view of the core member according to the present invention, Figure 7 is a state diagram showing the surface pressure distribution of the pad when braking while mounting the core member of the present invention, the same reference numerals in the same reference numerals Let's do it.

The present invention is to reduce the squeal noise caused by the non-uniform surface pressure distribution of the inner and outer pads in contact with the disk rotor during braking, as shown in the figure, the hub mounted to the outer peripheral surface of the knuckle-side spindle A disc rotor 2 coupled to the assembly 1 and the hub assembly 1 by screwing and rotating together, and braking in the interior of the housing 4 so as to be wrapped in an outer circumferential surface of one side of the edge of the disc rotor 2. Piston 5 which is supplied with pressurized hydraulic pressure and the inner / outer pads 6 which press and brake portions of the edge of the disc rotor 2 from the outside and the inside according to the pressure of the piston 5, 7) A disc brake comprising a caliper (3) installed with a caliper (3), having a thin thickness interposed between the outer pad (7) and the inner wall of the housing (4) to reduce squeal noise generated during braking. The core member 9 joins the additional auxiliary core member 10 to the front surface in contact with the outer pad 7.

Here, the auxiliary core member 10 adhered to the front surface of the core member 9 is a thin stainless steel plate having a thickness of about 0.2 to 0.3 mm, and the lower side of the auxiliary core member 10 which is in contact with the trailing side of the disc rotor 2 is almost in contact with the core member 9. The upper side which is in accord with the leading side of the disc rotor 2 while being of a matching size is formed slightly smaller than the size of the shim member 9.

Therefore, when the piston 5 in the caliper 3 is pressurized by the braking pressure oil during braking, the piston 5 first pushes the inner pad 6 toward the disc rotor 2, and with the repulsive force the outer pad ( 7 is also applied to the outer circumferential surface of the disc rotor 2 while braking is performed, wherein the auxiliary core member joined to the front surface of the core member 9 interposed between the outer pad 7 and the inner wall of the housing 4 10) is in contact with the trailing side rather than the leading side of the disk rotor 2, so that the surface pressure is increased, the surface pressure of the thinner leading side disk rotor 2 and the core member 9 is lowered.

That is, as shown in FIG. 7, the surface pressure of the inner / outer pads 6 and 7 in contact with the leading side of the disc rotor 2 is greater than the surface pressure of the inner / outer pads 6 and 7 in contact with the trailing side. As it becomes smaller, the squeal noise generated during braking is reduced.

As described above, according to the noise reduction structure of the disc brake according to the present invention, when the core member interposed between the outer pad and the inner wall of the housing of the caliper has a separate auxiliary core on the front surface of the pad so that the surface pressure of the pad is greater than the leading side, By adhering the members, the occurrence of squeal noise during braking is reduced, resulting in an effect of improving the merchandise of the automobile.

Claims (2)

A hub assembly (1) mounted on the knuckle side, a disk rotor (2) coupled to the hub assembly (1) and rotating, and a piston (5) supplied with hydraulic pressure when braking to the outer circumferential surface of the disk rotor (2); In the disc brake composed of the caliper (3) which is provided with inner and outer pads (6, 7) that come into contact with the disc rotor (2) and exert a braking force in response to the pressure of the piston (5), When braking by bonding a separate auxiliary shim member 10 to the front surface where the thin core member 9 interposed between the outer pad 7 and the inner wall of the housing 4 contacts the outer pad 7. Noise reduction structure of the disc brake, characterized in that the leading side surface pressure of the trailing side pressure is not greater than. 2. The auxiliary core member (10) has a lower side contacting the trailing side of the disc rotor (2) substantially the same size as the shim member (9) and an upper side contacting the leading side of the disc rotor (2). Noise reduction structure of the disc brake, characterized in that formed slightly smaller than the size of the member (9).