JPS62110035A - Disk brake - Google Patents

Abstract

PURPOSE:To prevent occurrence of noise at the time braking by pressing pads against both inside and outside faces of a rotor which rotates together with a wheel when braking, and suppressing the vibration of said pads at the time of braking. CONSTITUTION:The inside faces of caliper claws 4a, 4a are brought into contact with the outside face of a back metal 6 only at the rear side parts of the inside faces. Therefore, the center of a force that presses a pad 3 by the caliper claws 4a, 4a at the time of braking, is shifted to the rear in the rotating direction of a rotor 1, thereby, pressing the rear side, in the rotating direction, of the pad 3a little stronger than the front side. Accordingly, the front end edge 5a of the lining 5 of the pad 3 is not caught in the side face of the rotor 1, suppressing the vibration of the pad 3 to be low at the time of braking.

Description

[Detailed Description of the Invention] a1 Purpose of the Invention (Industrial Application! l!〒) The disc brake according to the present invention is used for braking automobiles, and is intended to reduce the generation of noise called squeal during braking. It is something to suppress.

(Prior Art) To brake an automobile, a so-called floating type disc brake, in which a caliper is displaceably mounted on a support, as shown in FIG. 3, is widely used.

In this conventional disc brake, a pair of front and back pads 3 are attached to a support 2 that sandwiches a rotor 1 rotating together with the wheel, and a pair of front and back pads 3 are attached to the support 2 so as to be slidable in the front and back directions.
A caliper 4 is attached to the upper part of the support 2 so as to be slidable in the front and back directions with respect to the support 2.

When braking, a piston installed in the caliper 4 connects one pad to the inner surface of the rotor 1 (in a disc brake, the inner and outer sides of the vehicle are closer to the center of the vehicle and the outer edges are outer). As a reaction, the caliper 4 slides a little against the support 2, and presses the other pad 3 against the outer surface of the rotor 1 via the caliper pawl 4a, strongly pushing the rotor 1 from both the inner and outer surfaces. Clamp and brake.

(Problems to be Solved by the Invention) However, in disc brakes constructed and operated in this manner, a noise called squeal is often generated during braking, causing discomfort to passengers, pedestrians, etc.

The causes of such noise are thought to be as follows. In other words, the rotor 1 of a disc brake does not rotate completely in a flat plane, but rather rotates slightly to the left and right, so the surface that comes into contact with the lining of the pad 3 on the side of the rotor is As a result, it becomes as if there are uneven surfaces. Therefore, during braking, the pad 3 that comes into contact with the side surface of the rotor 1 swings finely according to the unevenness.
This oscillation causes the above-mentioned noise called squeal. Various mechanisms can be considered to generate noise due to rocking, but for example, when the pad 3 swings in the length direction (rotation direction of the rotor 1), as shown in FIG. front end side (opposite anchor side. Rotor 1 is indicated by arrow a)
When rotating from right to left in the diagram as shown in the figure, the right side in the diagram.

) falls on the rotor 1, the front edge 5a of the lining 5 of the pad 3 bites into the side surface of the rotor 1 and strongly rubs against the side surface, causing the pad 3 to vibrate strongly due to the friction and generate noise. occurs.

For this reason, as shown in Japanese Utility Model Application Laid-Open No. 57-181938, an adhesive shim plate has been interposed between the back metal of the pad 3 and the piston or caliper pawl.
As shown in Japanese Patent Application Laid-open No. 120735, an outer pad is connected to a caliper pawl by a leaf spring, or as shown in Japanese Patent Application Laid-open No. 120736/1984, an inner pad is pressed. By partially recessing the end surface of the piston and the inner surface of the caliper pawl that presses the outer pad, when each pad vibrates, the piston and caliper pawl press the part that becomes the antinode of the vibration. It is being considered to do so.

However, since the technologies described in the above publications aim to suppress noise by suppressing the growth of generated vibrations, they are not effective to the extent that they can prevent the generation of loud noises that are jarring to the ears. However, it could not be called a complete solution.

The disc brake of the present invention prevents the generation of noise during braking by preventing the pad from moving itself during braking.

b1 Structure of the Invention (Means for Solving the Problem) The disc brake of the present invention, like the conventional disc brake explained with reference to FIG. , the end face of the piston fitted into the caliper 4 which is slidably engaged with the support 2 in the inward and outward directions, and the caliper claw 4a fixed to the caliper 4.
, 4a are configured to perform braking by pressing both the inner and outer surfaces of the rotor 1 that rotates together with the wheels. The inner surfaces of the caliper claws 4a, 4a, which press the outer pad 3 toward the rotor 1, and the outer surface of the outer pad 3 are connected to the caliper claws 4a, 4a.
It is possible to make contact only at a portion near the rear (anchor side) in the rotational direction of the rotor 1.

That is, in the disc brake of the present invention, as shown in FIG.
, 4a and the outer surface of the back metal 6 of the pad 3 may contact only at the rear (anchor side) portion of the inner surface, or as shown in FIG. By forming the convex portion 7.7, the outer surface of the back metal 6 and the caliper pawl 4a,
The inner surface of 4a is configured to abut only at the rear portion of the inner surface.

(Function) The action itself during braking of the disc brake of the present invention constructed as described above is similar to that of the conventional disc brake explained with reference to FIG. Since the center of the force pressing the pad 3 by a and 4a is shifted rearward in the rotation direction of the rotor 1 from the center of the pad 3, the pad 3 is pressed a little more strongly on the rear side in the rotation direction than on the front side in the rotation direction. It becomes like this.

For this reason, as shown in FIG.
The front edge 5a of the pad 3 is prevented from digging into the side surface of the rotor 1, and vibration of the pad 3 during braking can be suppressed.

C6 Effects of the Invention Since the disc brake of the present invention is configured and operates as described above, the degree of vibration of the pad during braking is reduced, and generation of harsh noise during braking can be prevented.

[Brief explanation of drawings]

1 and 2 are views corresponding to the A-A cross section in FIG. 3, showing two examples of embodiments of the disc brake of the present invention, and FIG. FIG. 4, a front view showing an example, is a view corresponding to the BB cross section in FIG. 3 showing a mechanism for generating noise. 1: Rotor, 2: Support, 3: Pad, 4: Caliper, 4a: Caliper pawl, 5. Lining, 5a: Front edge,
6: Back metal, 7: Convex part.

Claims (1)

[Claims] A pair of inner and outer pads are slidably held on the support.
The end face of the piston fitted inside the caliper that is engaged with the above-mentioned support so as to be able to slide in the inward and outward directions, and the inner face of the caliper pawl fixed to the caliper apply pressure to both the inner and outer sides of the rotor that rotates with the wheel, thereby applying braking. In the disc brake, the inner surface of the caliper claw fixed to the caliper and the outer surface of the outer pad are able to come into contact only at the portion of the caliper claw that is closer to the rear in the rotational direction of the rotor. Features a disc brake.