JPS637716Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a friction disk for a disk-shaped brake in a rotating electric machine.

Generally, the friction disc of a disc-shaped brake used for rotating electric machines has a square hole in its center, and the square shaft of the rotating shaft is loosely fitted into this square hole, so that the rotational force of the rotating shaft can be transmitted. At the same time, it is made to be able to slide in the axial direction.

Conventionally, such friction discs have only a brake lining formed by hardening a friction material such as asbestos with resin, but this has low mechanical strength and is likely to break.

Conventional products that solved this problem are shown in Figures 3 and 4.
As shown in the figure, there is a friction disk 1 formed by integrally molding a brake lining 4 with an annular reinforcing plate 3 as a core. Friction discs can be obtained at low cost without using. However, in this case, a third
As shown in the figure, the outer circumferential surface of the reinforcing plate 3 is brought into contact with the inner surface of the mold 5 so as to be flush with the outer circumferential surface of the brake lining 4, or as shown in FIG. It is necessary to contact the inner surface of the brake lining 5 and to make it flush with the inner circumferential surface of the brake lining 4.

However, in the former case, the reinforcing plate 3, which is a metal plate having a higher specific gravity than the brake lining 4, extends to the outer periphery of the friction disk 1.
The moment of inertia of increases. As a result, the amount of work done by the brake, which is proportional to the moment of inertia, increases and the life of the friction disc becomes shorter.

In the latter case, since the inner circumferential surface of the reinforcing plate 3 is exposed to the entire inner circumferential surface of the friction disk 1, the connecting portion between the rotating shaft and the friction disk becomes a direct metal-to-metal contact. Abnormal noise occurs when torque is transmitted.

The present invention was devised to solve this problem, and one embodiment thereof will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a friction disk having a square hole 2 in the center for connection to a rotating shaft. The outer diameter of the reinforcing plate 3 is made as small as possible to reduce the moment of inertia, and the inner diameter of the reinforcing plate 3 is made as small as possible to reduce the moment of inertia. The inner diameter of the lining 4 is made somewhat larger, and protrusions 3a for positioning the reinforcing plate 3 during molding are provided at several locations around the inner periphery of the reinforcing plate 3, and their tip surfaces P are The inner circumferential surface of the brake lining forming the square hole 2 is exposed flush with the central portion between both adjacent corner portions.

As explained above, the present invention has a protrusion 3 provided on the inner circumferential surface of the reinforcing plate only in the center between the two adjacent corners of the inner circumferential surface constituting the square hole 2 of the brake lining.
The tip surface of a is exposed, and the first
As shown by the imaginary line in the figure, the inner peripheral surface of the reinforcing plate is not exposed near the corner where the corner shaft portion 6 of the rotating shaft comes into contact, so that no abnormal noise is generated.

In addition, since the tip end surface of the protrusion provided on the inner circumferential surface of the reinforcing plate is exposed to the inner circumferential surface of the brake lining for positioning during molding, the outer diameter of the reinforcing plate can be adjusted to the brake lining. The outer diameter of the lining can be made as small as possible, and the reinforcing plate can be provided only on the inner edge of the brake lining, which is prone to cracking, so the moment of inertia of the friction disk can be reduced and the brake The amount of work can be reduced.

Therefore, according to the present invention, it is possible to create a rotating electric machine that has a long life and does not generate abnormal noise by using an inexpensive structure using reinforcing plates without using expensive materials with high mechanical strength for the brake lining. Friction discs can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a friction disk of a rotating electric machine according to the present invention, Fig. 2 is a cut side view thereof, and Figs. 3 and 4 are cut side views showing conventional ones, respectively, during compression molding. Indicates the condition. 1...Friction disk, 2...Square hole, 3...Reinforcement plate,
3a... Protrusion, 4... Brake lining.

Claims (1)

[Scope of utility model registration request] It consists of an annular reinforcing plate and a brake lining that is integrally molded with this reinforcing plate as the core.
In a friction disk for a rotating electrical machine that has a square hole in its center for connection to a rotating shaft, the outer diameter of the reinforcing plate should be made as large as possible than the outer diameter of the brake lining to reduce the moment of inertia. In addition, the inner diameter of the reinforcing plate is made slightly larger than the inner diameter of the brake lining, and a protrusion for positioning the reinforcing plate during molding is provided on the inner circumference of the reinforcing plate, the tip of which is shaped like the square hole described above. 1. A friction disk for a rotating electrical machine, characterized in that the friction disk is provided flush with the central portion between both adjacent corner portions of the inner circumferential surface of a brake lining forming the brake lining.