JPS6174924A - Manufacturing method of brake friction pad - Google Patents

Abstract

PURPOSE:To obtain enough strength against a shear force at the time of braking by filling sufficiently an insulation material in the penetration holes of a back metal and increasing its adhesion in the penetration holes concerned. CONSTITUTION:A back metal 11 having a plural number of penetration holes 11A, preliminarily formed particles 15 consisting of an insulation material and a lining material 14 are laid on top of each other in order and press formed in a heated condition. The insulation layer 15 acts as a connection between the back metal 11 and the lining material 14, and is filled sufficiently in the condition of proper adhesion to the penetration hole 11A.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a brake friction pad suitable for use in, for example, an automatic summer brake system, and to improve 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 following.

[Prior art]

In general, friction pads used in automobile brake systems reach an extremely high temperature due to frictional heat generated during frictional engagement with a disc, and this frictional heat is transferred to the brake cylinder via a metal backing. As a result, the brake fluid in the brake cylinder becomes overheated and evaporates, causing a phenomenon of brake failure in which braking is no longer possible, and there is a risk that an unexpected serious accident may occur. 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 through a heat insulating layer made of asbestos or the like.

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 backing metal having a plurality of through holes I A t I A t . board,
3 indicates a lining material located on the surface metal side of the preformed plate 20. Here, the preformed plate 2 is preformed by solidifying it with, for example, asbestos) t-phenol resin, and the phenol resin acts as a binder for the asbestos itself and is used as an adhesive between the backing metal 1 and the lining material 3. used as a means.

In order to integrally mold the backing metal 1, the preformed plate 2, and the lining material 3, the surface lateral pressure of the backing metal 1, the preformed plate 2, and the lining material 3 are overlapped 11σ times under heating conditions of, for example, 160 to 180°C. The friction pad shown in FIG. 4 can be formed by applying pressure to 500 Kq/cr&.

That is, as shown in FIG. 4, the preformed plate 2 serves as a heat insulating layer 4 interposed between the back metal 1 and the lining material 3, and
A protruding portion 5 protrudes into each through hole IA. As a result, the surface side of the heat insulating material layer 40 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 in the through hole IA as a protrusion 5, so that the force in the disk rotation direction that acts on the lining material 3 during braking, that is, the force that acts on the lining material 3. It is designed to receive the shearing force that occurs.

As described above, in the conventional method, in order to improve the strength against shearing force during braking, a part of the preformed plate 2 is filled in the through hole IA to form the protrusion 5.
It has the following drawbacks: That is, when the preformed plate 2 is pressure-molded, the fixed protrusion 5 that protrudes into the through-hole IA is formed by extruding a part of the preformed plate 2 into the entire through-hole IA, so that the forming Protrusion 5 due to shortage etc.
was formed only in an incomplete state, the degree of adhesion between the protrusion 5 and the through hole IA was reduced, and the desired strength against shear force could not be obtained. [Problems to be Solved] The present invention was developed in view of the above-mentioned drawbacks of the prior art, and by sufficiently filling the through hole of the back metal with a heat insulating material, the present invention has the strength to sufficiently withstand the shearing force during braking. An object of the present invention is to provide a method for manufacturing a friction pad for a brake.

[Means for solving problems]

In order to solve the above problems, the method for manufacturing a brake friction pad according to the present invention includes a back metal having a plurality of through holes;
A preformed grain made of a heat insulating material fitted into the through hole, a preformed plate made of a heat insulating material located on the side surface of the back metal, and a lining material located on the surface 'I+t of the preformed plate, The present invention is configured such that the backing metal, the preformed plate, and the lining material are pressure-formed under heating conditions in a state in which the through-hole QK preformed grains are fitted.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 and 2.

Fig. 1 shows the state before molding, and in the figure 11 indicates a plurality of through holes 11A, IIA, . . . back with gold, 12° 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 front side of the back metal 11, and 14 is a preformed grain on the front side of the preformed plate 13. Indicates the lining material located. Here, the back metal 11 and the lining material 14 are of the same shape as those of the prior art, and the preformed particles 12 and the preformed plate 13 are also solidified with asbestos phenol resin, for example, as in the prior art. Pre-formed. 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.

Incidentally, in order to integrally mold the backing metal 11, preformed grains 12, preformed plate 13, and lining material 14, the through hole 1 of the backing metal 1 must be
1A is fitted with preformed grain 12゛, and the surface III of backing metal 1 is
K preformed plate 13, lining material 4 gold sequentially stacked, for example, under heating conditions of 160 to 180'C, about 5ooKq/
By applying pressure to cl, the friction pad shown in FIG. 2 can be formed.

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. This becomes a protrusion 115 that is integrated with the layer 15. As a result, the heat insulating material layer 15 joins the back metal 11 and the lining material 14, and the protrusion 16 is firmly attached to the through hole 11A due to the suppressing force during molding, and is inserted into the through hole 11A. Fully filled. 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 formed.
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 IIJ shearing force during braking can be sufficiently reduced. The reinforcing function can be completely fulfilled.

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

〔Effect of the invention〕

Since the manufacturing method of the brake friction pad according to the present invention has been described in detail above, it is necessary to sufficiently fill the through hole of the back metal with the heat insulating material and to increase the degree of tightness within the through hole. Therefore, the protrusion as a reinforcing member can obtain sufficient strength against the shearing force during braking.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 relate to the present invention, Fig. 1 is a sectional view showing the state before molding, Fig. 2 is a sectional view of the friction pad after molding, and Fig. 3 and 4 are according to the conventional method. Accordingly, FIG. 3 is a sectional view showing the friction pad before molding, and FIG. 4 is a sectional view showing the friction pad after molding. DESCRIPTION OF SYMBOLS 11... Back metal, IIA... Through hole, 12... Preformed grain, 13... Preformed plate, 14... Lining material, 15... Heat insulating material layer, 16 River protrusion part.

Claims (1)

[Claims] A backing metal having a plurality of through holes, preformed grains made of a heat insulating material fitted into the through holes, a preformed plate made of a heat insulating material located on the front side of the backing metal, and a front side of the preformed plate. and a lining material located in each of the through holes, and the backing metal, the preformed plate, and the lining material are pressure-molded under heating conditions with preformed particles fitted in each of the through holes. Production method.