JPS6088234A - Method of forming return spring mount hole in disc brake friction pad - Google Patents

Abstract

PURPOSE:To facilitate forming a mount hole for mounting a return spring by fixing a friction material to a back metal, with a pipe member disposed on the fixing surface side of the back metal in case of fixing a friction material to the back metal to form a friction pad. CONSTITUTION:In case of forming a spring mount hole 18 on a friction pad 10 comprising a metallic reinforcing back metal 12 and a friction material 14, first a concave portion 20 substantially semi-circular in section is formed on the friction material 14 fixing surface side of the back metal 12 formed in a designated form in such a manner as to extend from the upper end of the back metal 12 toward the rotating center of a disc rotor (not shown) for a designated length. Subsequently, the back metal 12 is set in a metal mold cavity for molding a friction material, and a pipe member 22 is disposed in the concave portion 20. The previously molded friction material is filled in the above cavity, and the molding of the friction material 14 and adhering to the back metal 12 are performed under a designated temperature and pressure. Simultaneously, the pipe member 22 is adhered and fixed to use its hollow hole as the spring mount hole 18.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for forming a special hole in a return spring for disc brakes.

In conventional disc brakes, a pair of blades is generally 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. It's composed.

By the way, with such a disc brake)-c &;t
In order to avoid the undesirable phenomenon of the IW friction pad continuing to slide against the disc rotor even after the brake is released, so-called dragging, a return valve IJ is installed at the blade throat (=J), and each is moved to the non-active position. A force is being applied toward the

The mounting hole for the return spring has traditionally been formed by drilling a hole in the back metal of the pad, but this mounting hole is small and relatively long (
If the length is too short, the amount of charge at the end of the spring will be small and the band will return smoothly.This will require more time to process and may cause the tool to break or wear out. This has caused the problem of high processing costs.

Purpose of the Invention The present invention has been made against the background of the above-mentioned circumstances, and its purpose is to easily form mounting holes without the need for machining or tools for drilling holes. An 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.

Structure of the Invention To achieve this object, the present invention provides: 1) When forming a friction pad by fixing the friction material described in 1j to the backing metal, a pipe member is attached to the fixed surface side of the backing metal so that its end is external. Each time the friction material is fixed to the back plate in a state where the friction material is exposed, the pipe member is buried in the pad, and a hollow hole opened at the end of the pipe member is used to attach the spring. It is characterized by having a hole.

Effects of the Invention By doing this, when fixing the friction band to the back metal, since the hole (J hole) for attaching the return spring is formed at the same time, it is not necessary to drill the hole after forming the friction band. This saves time and effort.Therefore, since there is no need to use a drilling tool, the cost required for the tool is reduced, and the working time is shortened, as well as the machining cost.

EXAMPLE In order to make these features of the present invention more clear, one application example thereof will be explained in detail below with reference to the drawings.

Figure 1 shows the general shape of the friction pad (I♀" friction pad 1) and the spring mounting hole formed in it.
0 is composed of a metal reinforcing back metal 12 and a friction JA 14, and when the brake is applied, the friction material 14 is pressed against a disc rotor (not shown) that rotates together with the wheel.
At this time, rotation of the wheel is suppressed based on the frictional force generated between the two.

A pair of sliding parts 16 protruding in the same direction are formed at both ends of the back plate 12 in the disc rotor rotational direction (left and right direction in the figure), and are slidably supported by a support member (not shown) here. I'm in the middle of the day. On the other hand, the friction material 14 is asbestos and a friction modifier.

It is made by molding a binder etc. at a predetermined temperature and pressure, and the back metal 12
It is irremovably fixed to the

Near both left and right ends of the friction pad 10, a pair of return spring mounting holes 18 extending to approximately the center of the friction pad 10 in the height direction (radial direction of the disc rotor) are provided, spanning the friction +J14 and the back metal 12. The rod-shaped end of the return spring is inserted here to push the pad 10 back into its non-active position.

Next, a specific method for forming a spring hole in such a friction pad will be described.

First, as shown in FIG. 2, a longitudinal recess 20 having a substantially semicircular cross section is formed on the friction-fastening surface side of the backing metal 12, which is formed into a predetermined shape, from the upper end of the backing metal 12 diagonally in FIG. It is formed with a predetermined length toward the rotation center of the lower blade, that is, the disc rotor.

This recess 20 can be easily formed by coining. Next, this back metal 12 is placed into a mold cavity for molding the friction material with its fixed surface side, that is, the side where the recess 20 is formed facing upward. Next, as shown in FIG. 3, the pipe member 22 is placed in the longitudinal recess 20 on the back metal 12 with approximately half of the pipe member 22 being fitted into the back metal 12. A spring with an inner diameter that allows the end of the spring to be inserted and a length that is required by the installer is used, and the end on the buried side is shown in Figure 5. like,
The pull-out prevention portion 24 is bent in a direction perpendicular to its axis.

The recess 20 of the backing metal 12 has an opening at its tip for accommodating the removal prevention part 24.

When the pipe member 22 is placed in the recess 2o of the back metal 12, the preformed friction material Ig:+A is filled into the cavity, and then the friction material 1 is placed at a predetermined temperature and under a predetermined pressure.
The molding of 4 and the adhesion to the back metal 12 are done at the same time. At this time, the pipe member 2 placed within the recess 2° of the back metal 12
2 is the state where the remaining half is buried in the friction material I4 (
The state shown in FIG. 4 is reached. That is, friction + J
The pad 10 is formed by molding l 4 and adhering to the back metal 12.
The formation and embedding of the hype member 22 are done at the same time, and the hollow hole in the pipe portion jfA'22 becomes the access hole 18 in which the return spring is to be attached.

.

The end of the pipe member 22 on the side embedded in the pad 1o is bent in a direction perpendicular to its axis to form a pull-out prevention part 24, and approximately half of the pull-out prevention part 24 is bent in the same direction. The pipe member 22 does not fall out from the pad 10 because it enters into the recess 2° of the backing metal extending from the pad 10 and the remaining half is buried in the friction material 14.

In this way, according to the above method, the longitudinal recess 20 is formed in the backing metal 12, and the polishing 11. By simply placing the pipe part JrA22 in the recess when forming the +A14 and adhering it to the back metal 12, the spring removal 1 can be done at the same time as the pad 10 is formed.
A hole 18 is formed. Therefore, after that, there is no need for IJ31 machining to form the mounting holes, which saves time and effort, and there is no wear and tear on tools such as drills, which improves productivity and reduces processing costs. A reduction in

Note that the pipe member may be used in various other ways to form the pad 10.
It is possible to embed it within.

For example, as shown in FIG. 6, the depth in the radial direction of the longitudinal recess 20 formed in the back metal 12 is increased to
It is also possible to completely embed the friction material 14 in the recess 20, or as shown in FIG. ,
By placing the pipe member 22 at a predetermined position on the fixed surface side of the back metal 14 during adhesion, it is also possible to embed the entire pipe member 22 in the friction material 14 at the same time as the friction material 14 is formed and bonded.

When the pipe member 22 is embedded in the pad 10 in the manner shown in FIG. 6, (the same applies to the manner shown in FIG. 4).
It has the advantage that the pipe member 2 is reliably positioned at a desired position when molding the friction material 14, and when the pipe member 22 is embedded in the pad 10 in the manner shown in FIG. This has the advantage that the effort of forming a recess can be saved, and the number of man-hours for forming a hole can be further reduced.

In addition, the pipe member 2 buried in the pad 1o
The pull-out prevention portion 24 of No. 2 can also be formed in various forms different from those of the above embodiments.

FIG. 8 (not shown) and FIG. 10 show specific examples thereof, in which one end of the pipe member 22 is crushed to form a pull-out prevention portion 28 that protrudes outward in the radial direction. An example is shown in FIG. 9, where a part of the pipe member 30 near the end is shaved off and the end is used as the pull-out prevention part 32, and FIG. 10 is an example where the end of the pipe member 34 is An example is shown in which the diameter is expanded to form the pull-out prevention portion 36.

In the above embodiment, only one case was described in which the molding of the friction material and the adhesion to the back metal are performed at the same time, but the IW friction material is preformed into a plate shape in advance, and then it is bonded to the back metal. It is also possible to embed the pipe member in the friction pad during adhesion. However, in this case, it is necessary to form a recess into which a part of the pipe member is to be fitted when molding the friction material, or to embed the pipe member in the friction material during molding. In the latter case, the pipe member is embedded in the pad by fixing the friction material in which the pipe member is embedded to the back metal.

Further, the direction in which the longitudinal recesses 20 are formed does not have to be in the radial direction of the disc rotor, but may be parallel to each other or in directions that are spaced apart from each other as they approach the center of rotation of the disc rotor.

It should be noted that the above-mentioned embodiment is merely an example of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a friction pad to which a specific example of the mounting hole forming method according to the present invention is applied, and FIGS. 2 to 4 show the pad shown in FIG. FIG. 5 is a plan view of the main part showing the process, and is a front view of the pipe member in FIGS. 6 and 7 are principal part plan views showing friction bands and mounting holes formed according to other embodiments of the present invention;
1 through 1θ are front views showing a pipe member used in the present invention, which has a different form from that shown in FIG. 5. 10: Friction pad 12: Reinforcement backing metal 14: Friction material 18: Return spring removal Hole 22.26, 30, 34: Pipe member 24.28, 32.36: Pull-out prevention part q Figure 5 Figure 8 Figure 9 110FIA

Claims (2)

[Claims] (1) 1.1 for returning the pad to a non-operating position for a friction pad that has a reinforcing back metal and a friction material fixed thereto and is pressed against the disc rotor during braking.
This is a method of forming a J hole by inserting the rod-shaped α111 part of the spring and removing the spring. The pipe member is placed on the fixing surface side of the backing metal so that its end is exposed to the outside, and the pipe member is buried in the band by fixing the friction 1m+A to the backing metal, and thereby the pipe member is buried in the band. A method for forming a hole for a return spring in a friction pad for a disc brake, characterized in that a hollow hole opened at an end of a pipe member is used as a hole for the spring. (2) The pipe member is a pipe member in which a radially protruding or recessing prevention portion is formed in a portion of the pipe portion H that is to be embedded in the friction butt. The method for forming the hole described in paragraph 1.