JPH0221459B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a brake friction pad suitable for use in, for example, an automobile brake system, and which improves the strength against shearing force that acts during braking. The present invention relates to a method of manufacturing a brake friction pad that enables the production of brake friction pads.

[Prior art]

In general, friction pads used in automobile brake systems reach an extremely high temperature due to frictional heat generated when they are frictionally engaged with a disk, and this frictional heat is transferred to the brake cylinder via the back metal. As a result, the brake fluid in the brake cylinder is overheated and evaporates, causing a vapor lock phenomenon in which braking is no longer possible, which may lead to an unexpected serious accident. In order to prevent such a situation from occurring, friction pads have conventionally been known in which a backing metal and a lining material are integrated with a heat insulating layer made of asbestos or the like interposed therebetween.

Conventionally, friction pads having such a structure have been manufactured as shown in FIGS. 3 and 4.

That is, FIG. 3 shows the state before molding, in which 1 is a back metal plate having a plurality of through holes 1A, 1A, . The lining material located on the front side of the preformed plate 2 is shown. Here, the preformed plate 2 is preformed by, for example, solidifying asbestos with a phenolic resin, and the phenolic resin serves as a binder for the asbestos itself and as an adhesive between the back metal 1 and the lining material 3. used.

In order to integrally mold the back metal plate 1, preformed plate 2, and lining material 3, the preformed plate 2 and the lining material 3 are sequentially stacked on the front side of the back metal plate 1, for example,
By applying a pressure of about 500 kg/cm ² under heating conditions of ~180° C., the friction pad shown in FIG. 4 can be formed.

That is, as shown in FIG.
and the lining material 3.
At the same time, the protruding portion 5 protrudes into each through hole 1A. As a result, the front side of the heat insulating material layer 4 is joined to the lining material 3, the back side is joined to the back metal 1, and a part of the preformed plate 2 is filled as a protrusion 5 in the through hole 1A, and the braking It is adapted to receive a force in the disk rotation direction that acts on the lining material 3 at times, that is, a shearing force that acts on the lining material 3.

[Problem that the invention seeks to solve]

As described above, in the conventional method, in order to improve the strength against the shearing force during braking, a part of the preformed plate 2 is filled in the through hole 1A to form the protrusion 5. There are some drawbacks. That is, the protruding portion 5 protruding into the through hole 1A is formed by extruding a portion of the preform 2 into the through hole 1A when the preform plate 2 is pressure molded, so that the protrusion 5 may be insufficiently formed. Due to such reasons, the protrusion 5 is formed only in an incomplete state, and the degree of adhesion between the protrusion 5 and the through hole 1A is reduced, making it impossible to obtain the desired strength against shearing force. It was hot.

The present invention was made in view of the above-mentioned drawbacks of the prior art, and provides a friction pad for brakes that has sufficient strength to withstand shearing force during braking by sufficiently filling the through hole of the back metal with a heat insulating material. The purpose is to provide a manufacturing method.

[Means for solving problems]

In order to solve the above problems, the method of manufacturing a brake friction pad according to the present invention includes a backing metal having a plurality of through holes, and a heat insulating material that is inserted into the through holes of the backing metal and containing a thermosetting resin as a binding material. a preformed plate made of a heat insulating material that is located on the front side of the backing metal and contains a thermosetting resin as a binder; and a lining material that is located on the front side of the preformed plate, The present invention is configured such that the back metal, the preformed grains, the preformed plate, and the lining material are integrally pressure-molded under heating conditions with the preformed grains inserted into each through hole.

[Effect]

With this structure, the preformed particles are inserted into the through holes of the back metal, the preform plate and the lining material are placed on the front side of the back metal, and by heating in this state, the back metal and preform The grain, preform plate, and lining material can be heat-formed together.

[Example] Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 and 2.

FIG. 1 shows the state before molding, in which reference numeral 11 denotes a back metal having a plurality of through holes 11A, 11A, .
2, 12, ... are preformed particles made of a heat insulating material fitted into each through hole 11A, 13 is a preformed plate made of a heat insulating material located on the surface side of the back metal 11, and 14 is a surface of the preformed plate 13. The lining material located on the side is shown. Here, the back metal 11, the lining material 14
The same shape as the conventional technology is used,
Further, the preformed grains 12 and the preformed plate 13 are also preformed by solidifying asbestos with phenol resin, for example, as in the prior art.
It should be noted that the preformed plate 13 is formed slightly thinner than that of the prior art by an amount corresponding to the protrusion 5.

Next, in order to integrally mold the back metal 11, preformed grains 12, preformed plate 13, and lining material 14, the preformed grains 12 are fitted into the through holes 11A of the back metal 1,
A preformed plate 13 and a lining material 14 are sequentially stacked on the front side of the back metal 1, and the friction pad shown in FIG. 2 is formed by applying pressure to about 500 kg/cm ² under heating conditions of, for example, 160 to 180°C. Can be done.

That is, as shown in FIG. 2, the preformed plate 13 is inserted between the back metal 11 and the lining material 14 to form a heat insulating material layer 15, and the preformed grains 12 in each through hole 11A form the heat insulating material layer 15. Protrusion 1 integral with layer 15
It becomes 6. As a result, the heat insulating material layer 15
and the lining material 14, and the protrusion 16 is securely brought into close contact with the through hole 11A by the pressing force during molding, and is sufficiently filled into the through hole 11A. Moreover, since the pressure molding is carried out under heating conditions, the preformed grains 12 and the preformed plate 13
are sufficiently mixed, and after molding, the heat insulating material layer 15 and the protrusion 16 are completely integrated.

Thus, according to this embodiment, since the protrusion 16 is mostly formed by the preformed grains 12, there is no fear of insufficient molding as in the conventional method, and the shearing force during braking can be sufficiently applied. The reinforcing function can be reliably achieved.

In addition, in the embodiment, the preformed particles 12 and the preformed plate 13 were described as being molded from asbestos and phenolic resin, but other heat insulating materials may be used instead of asbestos, and phenolic resin may also be used. Other thermosetting resins may be used instead.

〔Effect of the invention〕

As described in detail above, the method for producing a brake friction pad according to the present invention is to heat the backing metal, preformed particles, preformed plate, and lining material under heating conditions with the preformed grains inserted into each through hole of the backing metal. Since the structure is configured so that the preformed plate and the preformed grains are integrally formed by pressure, after this molding, the preformed plate and the preformed grains are integrated to form a heat insulating material layer, and the preformed grains are formed in each through hole of the backing metal. In addition to being sufficiently filled with the heat insulating material, the degree of adhesion within each through hole can be increased, and the protrusion as a reinforcing member exhibits sufficient strength reinforcing function against shearing force during braking. can do.

[Brief explanation of drawings]

Figures 1 and 2 relate to the present invention; Figure 1 is a sectional view showing the state before molding; Figure 2 is a sectional view of the friction pad after molding; Figures 3 and 4 are according to the conventional method. Accordingly, FIG. 3 is a sectional view showing the state before molding,
FIG. 4 is a sectional view showing the friction pad after molding. DESCRIPTION OF SYMBOLS 11...Back metal, 11A...Through hole, 12...Preformed grain, 13...Preformed board, 14...Lining material, 15...Insulating material layer, 16...Protrusion part.

Claims (1)

[Claims] 1. A back metal having a plurality of through holes, preformed grains made of a heat insulating material that is inserted into the through holes of the back metal and contains a thermosetting resin as a binding material, and a heat insulating material that is located on the surface side of the back metal and contains a thermosetting resin as a binding material A preformed plate made of a heat insulating material containing a curable resin, and a lining material located on the surface side of the preformed plate, and with the preformed grains inserted into each of the through holes, the backing plate and the preformed grains are A method for manufacturing a brake friction pad, which comprises integrally press-forming a preformed plate and a lining material under heating conditions.