KR19990019131U - Surface Pressure Uniformity of Disc Brake Pads - Google Patents

Abstract

The present invention relates to the uniform pressure structure of the disc brake pad, and the piston and the pad and the pad during braking are interposed between a piston receiving hydraulic pressure in the caliper and a separate core member having a centrally convex curvature between the pad pressurized by the piston. The purpose is to prevent even wear of the pad and the occurrence of abnormal noise.

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 thickness between the piston (5) and the inner pad (6) is convex, and the edge portion is in close contact with the rear surface of the inner pad (6). The core member 9 is interposed.

Description

Surface Pressure Uniformity of Disc Brake Pads

The present invention relates to a disc brake, and in particular, interposed between a single piston in the caliper and the pad during braking, causing even surface pressure distribution to the front of the pad during braking, thereby preventing pad wear and deterioration of braking performance. The surface pressure uniform structure of the disk brake pads.

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, in the case of the single piston type having one piston 5 provided in the caliper 3, the non-uniform surface pressure distribution with the inner and outer pads 6 and 7 during braking is prevented. As shown in FIG. 3, this shows a high surface pressure distribution at the center of the inner / outer pads 6 and 7 in direct contact with the piston 5, and the surface pressure decreases toward the edge, that is, the surface pressure toward the center. As this concentration is concentrated, surface pressure does not act on both ends, resulting in non-uniform contact with the disc rotor (2) during braking. Therefore, the braking force is deteriorated and uneven wear and abnormal noise are generated at the inner and outer pads (6, 7). There was a problem.

On the other hand, a so-called dual piston type disc which conventionally provides two pistons 5 in the caliper 3 to prevent non-uniform surface pressure distribution between the piston 5 and the inner / outer pads 6 and 7 as described above. As a brake has been proposed, such a dual piston type has two pistons 5 and 5 'installed at the edges of the inner and outer pads 6 and 7 as shown in FIG. It is to relieve the disadvantage that the surface pressure is concentrated in the center of the outer pad (6,7) to reinforce the surface pressure distribution evenly over the surface of the pad, in particular the surface pressure of the edge portion.

However, the dual piston type disc brake as described above has the advantage of distributing even surface pressure over the entire pad, but has the disadvantage of high manufacturing cost.

The present invention has been devised to solve the above disadvantages, between the piston receiving the hydraulic pressure in the caliper, and a separate core member having a central convex curvature between the pad under pressure from the piston and the piston during braking. It is an object of the present invention to provide a uniform surface pressure distribution structure of a disk brake pad, which is capable of preventing even wear and abnormal noise of the pad.

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,

Figure 3 is a state diagram showing the surface pressure distribution of the pad according to the pressure of the conventional single piston,

4 is a state diagram showing the surface pressure distribution of the pad according to the pressure of the conventional dual piston,

5 is according to the pressure of the single piston via the core member of the present invention

State diagram showing the surface pressure distribution of the pad,

6 is a three-side view of the core member shown in FIG.

<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 10-viscosity fluid

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 center portion contacting the piston between the piston and the inner pad is convex, and an edge portion is formed on the back of the inner pad. A thin-thick core member 9 in close contact is interposed.

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

Figure 5 is a state diagram showing the surface pressure distribution of the pad according to the pressure of the single piston through the core member of the present invention, Figure 6 is a three-side view of the core member shown in Figure 5, the same reference parts as the prior art the same reference Let's write down the numbers.

According to the present invention, as shown in the drawing, the surface pressure distribution can be applied to the pad under pressure from the piston during braking to reduce sub-noise noise. A hub assembly mounted on the outer circumferential surface of the knuckle-side spindle 1 ), The disk rotor 2 coupled to the hub assembly 1 by screwing and rotating together, and the hydraulic pressure during braking inside the housing 4 so as to surround the outer peripheral surface of one side of the edge of the disk rotor 2. A piston (5) to be supplied and pressurized, and an inner / outer pad (6, 7) configured to pressurize and brake a portion of the edge of the disc rotor (2) according to the pressure of the piston (5), respectively. In the disc brake composed of the caliper (3) which is equipped and installed, the center portion that is in contact with the piston (5) is formed convexly between the piston (5) and the inner pad (6) and the edge portion is the inner pad (6). Times A thin metal core member (9) having a thickness such that the contact is interposed.

The core member 9 interposed between the piston 5 and the inner pad 6 encapsulates a viscous fluid 10 of grease inside the inner pad 6.

Accordingly, even when the piston 5 presses the center portion of the core member 9 during braking, the pressure is transmitted to the inner pad 6 by the core member 9, and the edge portion of the core member 9 Since the back surface of the inner pad 6 is pressed before the center of the inner pad 6, it is possible to act as if two pistons are pressed at both front end portions of the rear surface of the inner pad 6 so that the surface pressure distribution of the inner pad 6 appears. Will be similar to the above-mentioned dual piston type disc brake.

Therefore, when the inner pad 6 receives a uniform surface pressure distribution on its pressing surface, it is possible to prevent uneven wear with the disc rotor 2 during braking and also to reduce abnormal noise generated during braking.

Meanwhile, the viscous fluid 10 enclosed between the core member 9 and the rear surface of the inner pad 6 serves to damp vibrations while acting as a damping material between the piston 5 and the inner pad 6 during braking. .

As described above, according to the surface pressure uniform structure of the disc brake pad according to the present invention, a core member having a center convex formed between the inner pad and the piston is interposed, and when the braking is applied, the pressure of the piston is first transmitted to the edge of the pad, thereby providing a surface pressure of the pad. By making the distribution uniform, there is an effect that can prevent uneven wear and abnormal noise of the pad during braking.

Claims (1)

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), Between the piston 5 and the inner pad 6 is a convex center portion that is in contact with the piston 5, the edge portion is interposed a thin member 9 is in close contact with the back of the inner pad (6). Pressure uniform structure of disc brake pad.