JPH0335530B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for forming a mounting hole for a return spring in a friction pad for a disc brake.

Prior Art In a disc brake, a pair of friction pads is pressed against a disc rotor that rotates together with the wheel, and the rotation of the wheel is suppressed by the frictional force generated between them.

By the way, in such disc brakes,
In order to avoid the undesirable phenomenon of so-called dragging, in which the friction pads continue to slide against the disc rotor even after the brake is released, a return spring is installed between the friction pads to return them to a non-active position. The mounting hole for the return spring has conventionally been formed by drilling into the back metal of the pad, but this mounting hole has a small diameter and is relatively long (if it is short, the insertion distance at the end This causes problems in that the machining process is time-consuming, and the tools are prone to breakage and wear, resulting in expensive tools.

Purpose of the Invention The present invention was made against the background of the above, and its purpose is to eliminate the need for machining and tools for drilling holes,
Another object of the present invention is to provide a method for forming a return spring mounting hole in a friction pad for a disc brake, which allows the mounting hole to be easily formed.

Structure of the Invention In order to achieve the above object, the present invention provides a friction pad which has a reinforcing back metal and a friction material fixed thereto and which is pressed against a disc rotor, so that the friction pad is directed to a non-active position. A method of forming a mounting hole for inserting a rod-shaped end of a return spring to be biased and attaching the return spring, the method comprising: (a) the backing metal and a fixing surface to which the friction material of the backing metal is to be fixed; (b) forming a groove in at least one of the fixing surface of the backing metal and the backing plate material; (c)
(d) arranging the backing plate material on the fixing surface of the backing metal and at a position where the concave groove forms the mounting hole between the backing metal and the backing plate material; The method is characterized in that it includes the steps of fixing the friction material to the fixed surface of the arranged back metal and embedding the backing plate material in the friction pad.

Effects of the Invention With this structure, in the process of forming a friction pad, by embedding the backing plate material in the friction pad, the concave groove formed in at least one of the back metal and the backing plate attaches the return spring. Since it is used as a mounting hole for the friction pad, there is no need to use a drilling tool after forming the friction pad, which reduces the cost of tools, shortens work time, and reduces machining costs. be.

Embodiment Hereinafter, one application example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a friction pad 10 with a general shape and a return spring mounting hole 20 formed therein. At times, the friction material 18 is pressed against a disk rotor (not shown) that rotates together with the wheel, and at this time, the rotation of the wheel is suppressed based on the frictional force generated between the two.

A pair of sliding parts 15 protruding in the same direction are formed at both ends of the back plate 12 in the disk rotor rotation direction (horizontal direction in the figure), and are slidably supported by a support member (not shown). It is becoming more and more common. On the other hand, the friction material 18 is formed by molding asbestos, a friction modifier, a binder, etc. at a predetermined temperature and pressure, and is irremovably fixed to the back metal 12.

Near both left and right ends of the friction pad 10, a pair of spring mounting holes 20 are formed between the friction material 18 and the back metal 12, extending to approximately the center of the pad 10 in the height direction (radial direction of the disc rotor). friction pad 1 pressed against the rotor.
The rod-shaped end of the return spring for returning the zero to the non-active position is inserted here.

Next, a specific method for forming the return spring mounting hole 20 in the friction pad 10 will be described.

First, as shown in FIG. 2, a U-shaped cross-sectional shape is formed on the friction material fixing surface of the reinforcing back metal 12 formed in a predetermined shape, and the groove depth and width are the same as that of the rod-shaped end of the return spring. Concave groove 14 with external shape and dimensions
is formed to have a predetermined length along the radial direction of the disk rotor (not shown) from the upper end of the back plate 12 in FIG. 1 diagonally downward in the figure, that is, toward the center of rotation of the rotor. This groove 14 can be easily formed by coining processing or the like. Next, as shown in FIG. 3, a material such as a metal plate or a heat-resistant material that can withstand the pressure and temperature when adhering the friction material, which will be described later, is placed on the friction material fixing surface of the back metal 12 at a position that covers the groove 14. A backing plate material 16, which is a resin plate, is placed.
Then, while forming the friction material 18 and adhering it to the backing metal 12 with the backing plate material 16 sandwiched therebetween under predetermined pressure, temperature, and time, the friction material 18 is attached to the backing metal 12.
It sticks to 2. The molding and bonding temperature of this friction material 18 is generally selected within the range of 130 to 200°C, and the molding time is selected within the range of 5 to 30 minutes. FIG. 4 shows this process.

As a result, in the state where the molding of the friction material 18 and the fixing to the back metal 12 are completed, the above-mentioned concave groove 1
4, the space formed between the backing plate material 16 and the back metal 12 becomes the return spring mounting hole 20, as is clear from FIG.

In this way, the groove 14 is formed in advance on the back metal 12, and the back plate material 16 is placed, and then the friction material 18 is placed.
When molded and fixed, the return spring mounting hole 20 of the friction pad is formed at the same time, so there is no need for conventional machining to form the mounting hole after molding the friction pad, and the wear and tear of tools such as drills is reduced. As a result, productivity can be improved and processing costs can be reduced.

Note that the above-mentioned embodiment is merely one embodiment of the present invention, and the present invention is also applicable to other aspects.

For example, the groove 14 formed on the surface of the back metal 12
As shown in FIG. 5, the cross section may be formed into a substantially semicircular shape, and in this case, the backing plate material 16 has a concave groove 14 of the back metal 12 and a groove having the same diameter as the rod-shaped end of the return spring in the center thereof. A recess 22 is formed in advance to form a cylindrical space. Further, as shown in FIG. 6, the groove 14 is not formed in the back metal 12, and only the back plate material 16 has the groove 14 formed therein.
A longitudinal recess 22 having a U-shaped cross-sectional shape similar to 4 may be formed in advance. By doing so, there is an additional advantage that the effort of forming the groove 14 on the back metal 12 can be saved. The groove 14 and the groove 22 in FIG. 5 correspond to the groove 14 and the groove 22 in FIG. 6, and the groove 22 in FIG. 6 corresponds to the groove in the claims.

Further, by forming the backing plate material 16 for forming the return spring attachment hole 20 as follows, it is possible to prevent the return spring attachment hole 20 from coming off. That is, as shown in the longitudinal cross-sectional view of FIG. By arranging the cover plate 16 so that it hangs over the friction material, it is possible to reliably prevent the backing plate 16 from coming off after the friction material has been fixed. Further, as shown in FIG. 8, if a notch 28 is formed at the end of the caul plate material 16, the friction material 18 will be stuck inside the notch 28 when the friction material 18 is bonded. This will prevent it from coming off.

Furthermore, the direction in which the grooves 14 are formed is not limited to an oblique direction along the radial direction of the disc rotor, but may also be parallel to each other or in a direction that is spaced apart toward the center of the disc rotor.

[Brief explanation of the drawing]

FIG. 1 is a front view of a friction pad in which mounting holes are formed by applying an example of the present invention. 2 to 4 are plan views of essential parts showing each step for forming a return spring mounting hole in the friction pad shown in FIG. 1. FIG. 5 and 6 are plan views showing essential parts of a friction pad formed according to another application example of the present invention. Figures 7 and 8
The figure is a vertical cross-sectional view showing one example of application of the present invention in processing, and FIG. 8 is a front view showing another example of application similar to FIG. 7 without the friction material. 10: Friction pad, 12: Reinforcement back metal, 14: Concave groove, 16: Backing plate material, 18: Friction material, 22: Concave part (concave groove), 20: Return spring mounting hole.

Claims (1)

[Scope of Claims] 1. A rod-shaped end of a return spring that urges a friction pad that has a reinforcing back metal and a friction material fixed thereto and is pressed against a disc rotor toward a non-acting position. A method of forming a mounting hole for attaching the return spring by inserting a part therein, the method comprising: preparing the backing metal and a backing plate material that is brought into contact with a fixing surface to which the friction material of the backing metal is to be fixed; , forming a concave groove on at least one of the fixed surface of the backing metal and the backing plate material; and the step of forming a groove on the fixed surface of the backing metal and where the groove is between the backing metal and the backing plate material. a step of arranging the corresponding plate material at a position where the hole is to be formed; and a step of fixing the friction material to the fixing surface of the back metal on which the patch plate material is placed, and embedding the corresponding plate material in the friction pad. A method for forming a return spring mounting hole for a friction pad for a disc brake, the method comprising: