JPS6249030A - Disc brake device for vehicle - Google Patents

Abstract

PURPOSE:To enhance the cooling effect of a disc brake, by providing frictional members each constituting a brake pad, both surfaces of an annular disc section in a brake disc, and by exposing the outer surface of the annular disc section in part. CONSTITUTION:Frictional members 25, 26 for constituting pads are applied on and integrally incorporated with both surfaces 23, 24 of an annular disc section 201 in a brake disc 2. Several holes 251..., 261...are formed in the frictional members 25, 26 applied on both surfaces of the disc section 21 in the disc 2, piercing thicknesswidth therethrough. Accordingly, the outer surface of the disc section 21 is uncovered and therefore exposed at several positions 231..., 241.... Thereby, even if the disc section as a core metal is heated by brake generating heat transmitted from the frictional members to the disc section, it is possible to radiate the heat.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disc brake device for a vehicle.

(Prior Art) A disc brake type brake system has been put into practical use as a vehicle brake system, and this type is composed of a brake disc on the wheel side and a brake caliper on the main body side. A brake caliper consists of a piston that is operated by hydraulic pressure and a brake pad, which is a friction member that is pressed by the piston.A metal brake disc part is placed between the brake pads, and the piston presses the brake pad, causing the brake disc to The brake is applied by squeezing the disc portion of the brake.

(Problem to be Solved by the Invention) In the brake devices developed in the north, the annular disc part of the brake disc is compressed by the pad, so the disc part is parallel to each other!
= High degree of flatness is required, ■One brake noise,
A certain surface roughness is required for compatibility with the pad, and manufacturing 1-
Extremely high viscosity is required, and production is troublesome, complicated, and difficult, and costs are high.Currently, any of the above requirements is suppressed to a certain extent to match practical requirements.

In addition, the disc part rubs against the pad every time you brake, and the surface gets scratched as a result of being rubbed.Since it is on the wheel side, moisture etc. adhere to it and cause rust, which can lead to IA scratches, which can lead to life-threatening problems and poor durability. In addition, since braking is performed using a pad with a small area, the wear of the pad is relatively short, and it is necessary to replace it, so it is desirable to improve the life and durability in this respect, as well as the parallelism, Even if surface roughness is maintained at a high level, it is difficult to completely suppress vibrations during pressure braking by brake pads because the disc is made entirely of metal, and it is difficult to completely suppress so-called brake squeal.

The present invention has been made to solve the above problems, and its objectives are to suppress accuracy to a certain level, be advantageous in manufacturing, advantageous in cost, and have excellent longevity and durability.
It is an object of the present invention to provide a disc brake device for a vehicle that is advantageous in terms of preventing brake squeal noise, has excellent heat dissipation properties, and is advantageous in terms of cooling.

(Means for Solving the Problems) A means for solving the above problems is to integrally provide a friction material constituting a brake pad on both surfaces of the annular disc portion of the brake disc, and to A hole or the like is provided to expose a portion of the surface of the annular disk portion.

(Function by stage l-f) According to the above means, since a part of the annular disk portion serving as the mandrel is exposed, heat is radiated from this part.

(Example) Fig. 1 is a longitudinal sectional view of a brake device (1) according to the present invention, where the brake consists of a brake disc (2) made of steel plate and a brake caliper (3), the disc (2) not shown. It is attached and supported on the wheel side (rotation side), has an annular disk part (21) on the peripheral part, and fixes the inner diameter side hub part (22) to the wheel side.

The brake caliper (3) includes a bridge part (32) on the upper part of the main body (31), and a hanging support part (33) at the tip of the bridge part (32). A cylinder (34) is integrally provided so as to face and be separated from the support part (33), and a hydraulic chamber (35) is provided at the back of the cylinder (34), and piping is connected to a hydraulic power source (not shown), that is, a master cylinder. It is connected through. The cylinder (34) has a piston (3B
) is slidably fitted, (37) is a sealing O-ring, and (38) is a sealing member.

The piston (36) has a hollow shape that is open to the front, with a closed base end surface (313a) facing the hydraulic chamber and an open end edge (38a).
A stopper (39) which is a clamping member for braking on this side is supported, and a stopper (39) is supported on the supporting part (33) facing the main body (31).
40) is supported, and the braking pads (39) and (40) are made of metal or ceramic.

On the other hand, on both surfaces (23) and (24) of the annular disc portion (21) of the previously mentioned brake disc (2), friction materials (25) and (2Ei) constituting a conventional pad are integrally applied over the entire surface. Paste it. Such friction materials (25), (28
) is pasted on both sides of the disk part (21), which faces between the surfaces of the brake caliper (3) and the current (3s) and (40) mentioned above.

Friction materials (25) and (21) on both surfaces (23) and (24) of the disc portion (21) of the above brake disc (2)
3) Adhering, fixing, and integrating are performed using adhesives, rivets, etc.

In the above, hydraulic pressure is actuated on the back surface of the base end surface (38a) of the piston (36), thereby the piston (36) moves forward, and the current (38) also moves to the left in FIG. 1 accordingly,
The surfaces of the friction materials (25) and (2+3) on both sides of the disk portion (21) are pressed between the surfaces (39) and (ao) to perform braking.

In the above, the disk portion (21) of the disk (2),
Friction material (25) attached to both sides (23) and (24) of
, (2f3) has a hole (251) that penetrates in the thickness direction.
..., (261)... are formed. As a result, the surfaces (231)..., (241)... of the disk portion (21) facing the holes (251)..., (261)... are uncovered and exposed. The surface is shown in Figure 2.

FIG. 3 shows a modified embodiment, in which elastic slits (252) are used, a plurality of slits may be formed concentrically, or the slits may be formed in a spiral shape.

(Effects of the Invention) As is clear from below-L, according to the present invention, the friction material is integrally provided on the disc side, and a hole is provided in the friction material to expose a part of the surface of the disc part, so that heat generated by braking is reduced. Heat can be dissipated even if the disk part that forms the core metal is heated by heat transfer from the friction material to the disk part, and cooling is performed effectively by the rotation of the disk.In addition to this excellent cooling effect, the friction material on the disk side Because it is integrally provided, the surface accuracy of the disc part is determined by the abutment corresponding to the pad on the caliper side, and by simply increasing the surface accuracy of the small area of the abutment, it is possible to eliminate the need for the conventional high precision of the disc part. The friction material surface is wider than the conventional pad surface, so the amount of wear of the friction material is reduced, and the durability and lifespan are improved by 1. In particular, since the surface of the disc part is coated with different types of friction materials, the vibrations generated during braking are absorbed by the friction materials, providing good vibration isolation, and the pad corresponding to the pad side can be integrated with the piston side. Therefore, the rigidity of the conventional pad side is increased, and in addition to the above, it is possible to prevent so-called brake squeal.Furthermore, unlike conventional pads, the friction material is provided on the rotating side, so effective cooling can be achieved, and the heat of the friction material is reduced. It has many advantages, such as being able to prevent deterioration and further improving lifespan and durability.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view of a brake device, FIG. 2 is a surface view of the main part of a brake disc, and FIG. 3 is a surface view of the main part of another embodiment. It is. In the drawings, (1) is the brake device, (2) is the brake disc, (21) is the disc part, (25) and (2B) are the friction materials, (251) and (2B+) are the holes forming the exposed part, (36) is a piston.

Claims (1)

[Claims] In a vehicle disc brake device consisting of a brake disc on the wheel side and a brake caliper that pinches the annular disc part of the disc from both sides with pistons, a friction material constituting a brake pad is integrated on both sides of the annular disc part of the brake disc. 1. A disc brake device for a vehicle, characterized in that a part of the surface of an annular disc part is exposed.