JPH07158673A - Vehicular friction material fitting method - Google Patents

Abstract

PURPOSE:To secure large sliding friction area without forming a through hole in sintered friction material and improve wear resistance as a pad of the same size. CONSTITUTION:A reinforcing plate 3 with metal plating 4 applied thereto and with a rivet 2 passed in a through hole 3a, and friction material 11 having a recessed part 1a formed therein and compression-molded out of inorganic material mainly composed of metal powder containing copper and iron are sintered in the pressure-welded state of the faying surface 10 between the metal plating applied face of the reinforcing plate 3 and the friction material 11, with the head 2a of the rivit 2 received in the recessed part 1a. The friction material 11 is thereby formed into sintered friction material 1, and the reinforcing plate 3 is bonded to the sintered friction material 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a friction material for vehicles.

[0002]

2. Description of the Related Art As a conventional method for mounting a friction material for a vehicle, there is one disclosed in Japanese Patent Laid-Open No. 4-249626. That is, a friction material for a vehicle, which is provided with a friction material fixed to one side surface of the reinforcing plate and a receiving member connected to the other side surface of the reinforcing plate with a plurality of rivets, for contacting the friction material with a disk rotating with the wheel. A method of attaching a material, wherein a part of the rivet is caulked between a reinforcing plate and a receiving metal so that relative displacement based on a difference in thermal expansion can be performed.

According to such a method of mounting the friction material for a vehicle, the difference in thermal expansion due to the temperature difference between the reinforcing plate and the metal receiving member during braking operation is favorably absorbed without increasing the rigidity of the components. Therefore, warpage due to plastic deformation of the reinforcing plate is prevented, dragging due to deformation of the friction material, local wear, peeling, etc. are not only avoided, but the exposed reinforcing plate directly contacts the disk and damages the disk. Problems are prevented.

A metallic friction material using a metal as the friction material is known. Generally, this friction material is manufactured by sintering and has excellent stability of friction coefficient at high temperature compared to organic friction material, less change in braking effect, excellent wear resistance, fade and water. Since the fade is small and the heat conduction is good, the temperature of the friction surface can be kept low even with the same absorbed energy.

However, since the reinforcing plate is attached to the receiving plate with a small temperature rise by a plurality of rivets (specifically, four), relative deformation due to the difference in thermal expansion is allowed. However, it is difficult to achieve both the firm attachment of the friction material between the adjacent rivets. Further, in such a conventional vehicle friction material mounting method, since the through hole is formed in the friction material for the purpose of rivet, the sliding friction surface of the friction material is reduced by the amount of the through hole. There is a problem called.

[Means for Solving the Problems]

The present invention has been made in view of the above-mentioned conventional technical problems, and the structure thereof is such that the metal plating 4 is applied and the through hole 3a is formed.
To form a reinforcing plate 3 through which the rivet 2 is passed and a recess 1a,
A friction material 11 formed by compression molding an inorganic material mainly composed of a metal powder containing copper and iron was subjected to metal plating 4 of the reinforcing plate 3 with the head 2a of the rivet 2 being received in the recess 1a. A vehicle characterized in that the joint surface 10 between the surface and the friction material 11 is pressed and sintered to form the friction material 11 as the sintered friction material 1, and the reinforcing plate 3 and the sintered friction material 1 are bonded together. It is a method of attaching the friction material for use.

[Action]

The reinforcing plate 3 and the sintered friction material 1 according to such a method of mounting a friction material for a vehicle are fixed to a pressure plate by rivets 2 to form a pad. This pad is incorporated in a disc brake of a railway vehicle, for example, and is used for braking operation. At the time of braking operation, the friction material comes into sliding contact with the disk rotating together with the wheel, and a braking force is obtained.
At that time, the braking force is supported via the rivet 2. The concave portion 1a that receives the head portion 2a of the rivet 2 has a joining surface 10
Since the through-hole is not formed in the sintered friction material 1 and the sliding friction surface is a smooth surface, a wide sliding friction surface can be secured and a high braking torque can be generated.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention.
In FIG. 3, reference numeral 1 is a sintered friction material, and one side surface of the sintered friction material 1 is provided with a recess 1a. This recess 1a
Is for receiving the head portion 2a of the rivet 2, and is formed before the sintering friction material 1 is sintered. As the rivet 2, a tubula rivet or a split rivet is used because the caulking work of crushing from the shaft side can be easily performed. Reference numeral 3 is a reinforcing plate. The reinforcing plate 3 has a circular through hole 3a at the center and has a disc shape, and a folded edge 3b is formed at the peripheral edge by flanging. Further, the surface of the reinforcing plate 3 on the side where the folded edge 3b is formed is preliminarily subjected to metal plating, specifically copper plating 4, including the inner surface of the folded edge 3b. It should be noted that the height of the raised edge portion 3b is desired to be long from the standpoint of supporting the sintered friction material 1 shown in FIG. 3, but it should be possible to wear a predetermined amount from the sliding friction surface 1b side. Should be formed on the head 2 of the rivet 2
It is formed to have almost the same height as a.

The sintered friction material 1 is manufactured as follows. First, an inorganic material is put into a mold and compression-molded to form a friction material 11 having a recess 11a on one side as shown in FIG. Here, the inorganic material is mainly composed of metal powder containing copper powder and iron powder, to which non-metal powder is added and mixed. Generally, this inorganic material is uniformly mixed by a stirrer, put into a mold at room temperature and compression molded to obtain a green compact. During this compression molding, 2000-6
A pressure of 000 Kgf / cm ² is applied. Next, the friction material 11, which is a green compact, the rivet 2 and the reinforcing plate 3 are assembled in the state shown in FIG. 2 and sintered. That is, friction material 1
The head portion 2a of the rivet 2 is received in the recess 11a of the rivet 2, the shaft portion of the rivet 2 is passed through the through hole 3a of the reinforcing plate 3, and the periphery of the friction material 11 is surrounded by the folded edge portion 3b having a predetermined height. It will be in a state of

Then, using a jig (not shown), the friction material 1
1 and the reinforcing plate 3 were tightened, and the friction material 11 was sintered by pressing the joining surface 10 between one side surface of the friction material 11 and the copper-plated surface 4 of the reinforcing plate 3 under pressure. The reinforcing plate 3 and the sintered friction material 1 are joined together with the sintered friction material 1. Friction material 1 containing copper powder and iron powder during sintering
No. 1 expands by causing a so-called copper expansion phenomenon. Therefore, the periphery of the sintered friction material 1 is firmly fixed to the folded edge portion 3b. Thus, this sintering is carried out under pressure in a reducing atmosphere with hydrogen or natural gas, giving a temperature of 800-900 ° C.

The friction material assembly 6 thus manufactured is attached to a pressure plate 7 having a through hole 7a and an annular recess 7b as shown in FIG. That is, the shank of the rivet 2 is passed through the through hole 7a, and the projecting end of the shank of the rivet 2 is caulked in the recess 7b so that the caulked portion of the rivet 2 does not project from the back surface of the pressure plate 7. Stick to it. As shown in FIG. 4, a plurality of (15 in this example) friction material assemblies 6 are fixed to the pressure plate 7 by rivets 2, respectively, to form pads 9.

The pad 9 having the above-described structure is incorporated in a disc brake of a railway vehicle, for example, and is used for braking operation. During the braking operation, the sliding friction surface 1b of each sintered friction material 1 is brought into sliding contact with a disk (not shown) that rotates together with the wheel, and a braking force is obtained. The braking force at that time is firmly supported by the pressure plate 7 via one rivet 2 in each sintered friction material 1. Recessed portion 1a for receiving the head portion 2a of the rivet 2
Is formed on the joint surface 10 between the sintered friction material 1 and the reinforcing plate 3, and the sliding friction surface 1b of the sintered friction material 1 is a smooth surface, so that a wide sliding friction surface 1b is secured and high braking is achieved. Torque can be generated.

As the braking operation is performed, the temperature of the sintered friction material 1 rises due to frictional heat, and the reinforcing plates 3 are heated. Due to this braking heating, the sintered friction material 1 and the reinforcing plate 3 which have a temperature difference from the pressure plate 7 largely thermally expand, but the reinforcing plate 3 is attached to the pressure plate 7 by one rivet 2 and burned. The thermal expansion of the binding friction material 1 and the reinforcing plate 3 is free, so that the periphery of the sintered friction material 1 is supported by the raised edges 3b of the reinforcing plate 3 and the deformation of the reinforcing plate 3 is also performed. Also, peeling of the joint surface 10 between the sintered friction material 1 and the reinforcing plate 3 is favorably suppressed.

By the way, in the above embodiment, the recess 1a is formed in the sintered friction material 1 to receive the head 2a of the rivet 2, but only the reinforcing plate 3 or the reinforcing plate 3 and the sintered friction is used. It is also possible to form a recess in both of the materials 1 to receive the head 2a of the rivet 2. Further, although the reinforcing plate 3 and the sintered friction material 1 are given a circular shape, various shapes such as a triangle and a rectangle can be given.

【The invention's effect】

As can be understood from the above description, according to the vehicle friction material mounting method of the present invention, the sintered friction material is mounted on the brake without forming through holes in the sintered friction material. As a result, a large sliding friction area of the sintered friction material can be secured, and wear resistance can be improved as a pad of the same size.

[Brief description of drawings]

FIG. 1 is a sectional view showing a friction material according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the friction material assembly in the same manner.

FIG. 3 is a sectional view showing a state in which the friction material assembly is likewise attached to the receiving metal.

FIG. 4 is a view showing a pad of the same.

[Explanation of symbols]

1: Sintered friction material, 1a: concave portion, 1b: sliding friction surface, 2:
Rivet, 2a: Head, 3: Reinforcement plate, 3a: Through hole, 4:
Copper plating (metal plating), 6: friction material assembly, 10: joining surface, 11: friction material.

Claims (1)

[Claims] 1. A metal plating (4) is applied to the through hole (3).
a reinforcing plate (3) having a rivet (2) passed through a), and a friction material (11) formed by compression molding an inorganic material mainly containing a metal powder containing copper and iron to form a recess (1a), With the head (2a) of the rivet (2) received in the recess (1a), the joining surface (10) between the metal-plated surface (4) of the reinforcing plate (3) and the friction material (11). ) Is pressed to sinter, the friction material (11) is used as a sintered friction material (1), and the reinforcing plate (3) and the sintered friction material (1) are joined together. How to install the friction material.