JPS6234971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in ventilated disk rotors.

The disc rotor in a brake device is a part of a braking mechanism that brakes the rotation of a shaft that rotates integrally with the disc rotor by being rotationally braked by friction materials that are pressed on both sides. It is known that frictional heat is generated due to the clamping pressure of the materials, resulting in considerably high temperatures.

Such a temperature rise in the disc rotor causes thermal stress and distortion in the members, but in split-type disc rotors, which are provided with particular consideration to ease of assembly, This tends to cause stress concentration on the end face of each divided piece that is joined to the disc rotor, which sometimes poses a problem in terms of the durability of the disc rotor or the flatness of the rotating surface.

The disc rotor of the present invention has been proposed to solve these difficulties, and its gist is that a pair of opposing friction pads are sandwiched between sliding contact surfaces on both the front and back surfaces to be pinched. It is a disc rotor in which a large number of radial air circulation holes are formed spaced apart in the circumferential direction in the thick interior, and each of the front and back sliding surfaces in contact with the friction material has a A plurality of narrow grooves are formed leading to the air circulation holes and from the radially inner edge to the outer edge of the sliding surface, and these grooves are arranged alternately on both the front and back surfaces. There it is.

In the present invention, the thin grooves are formed on the sliding surfaces of both the front and back surfaces in a symmetrical arrangement as described above.
This is to prevent excessive stress concentration from occurring locally by balancing the strain on the disk rotor that occurs when the temperature of the disk rotor increases.

The present invention will be explained below based on embodiments shown in the drawings.

Figures 1A and 1B show the disc rotor of Example 1, and in the figures, 1 is the main body of the disc rotor;
Reference numeral 2 denotes a sliding surface of the friction material, which is formed at the peripheral edge of the disc rotor main body having a constant thickness, and has two sides, the front and the back.

Reference numeral 3 denotes a radial air circulation hole formed in a peripheral portion having a constant thickness, which is divided into a large number of holes in the circumferential direction by a partition wall 4, and its inner diameter side is opened alternately on the front and back sides.

6 is an air circulation hole 3 from one side of the front and back sliding surfaces 2;
These are narrow grooves that are formed penetrating in the thickness direction so as to reach , and are formed alternately every other on the front and back sides, with the spaced air circulation holes 3 as one unit. Therefore, the narrow grooves 6 are arranged alternately on the front and back sliding surfaces.

Since this disc rotor is a so-called ventilated type disc rotor, if a temperature rise occurs due to the friction material being pressed against the sliding surface 2 of the disc rotor, it will be different from a normal ventilated disc rotor. Similarly, the effect of cooling by the air passing through the air circulation holes 3 is of course obtained, and the presence of the above-mentioned narrow grooves 6 also provides
Strain in the disc rotor when the temperature rises is not transmitted to adjacent parts, so stress is concentrated in a certain part (for example, the end face of a split piece) based on the strain that occurs in the entire disc rotor. This has the effect of significantly reducing the harmful effects that can occur.

FIG. 2 shows an example in which the number of narrow grooves 6' is less than that shown in FIG. As a unit, narrow grooves 6' are formed every third.

It should be noted that since it can be assumed that the temperature rise on the front and back sides of the disc rotor is approximately the same, it is necessary to mutually buffer the strain that occurs on the front and back so that the temperature rise that occurs on the front and back does not lead to thermal deformation of the disc rotor. . For this reason, both the example shown in FIG. 1 and the example shown in FIG. 2 have a characteristic structure in which the narrow grooves are arranged alternately and symmetrically.

As described above, the disc rotor according to the present invention exhibits excellent effects in terms of durability and maintenance of the flatness of the sliding contact surface, and also has excellent effects in terms of maintaining the flatness of the sliding contact surface, which is divided in the circumferential direction. Compared to the case where the narrow grooves are the same on both the front and back surfaces, the mode is made more cluttered, which is advantageous in terms of noise generation, and the practical benefit is extremely large.

[Brief explanation of the drawing]

FIG. 1A is a partial front view of a disk rotor showing a first embodiment of the present invention, FIG. 1B is a side view of the same portion, and FIG. 2 is a partial side view of a second embodiment. 1: Disc rotor body, 2, 2': Sliding surface, 3, 3': Air circulation hole, 4, 4': Partition wall, 5,
5': opening, 6, 6': narrow groove.

Claims (1)

[Claims] 1 A disk rotor having a large number of radial air circulation holes spaced apart in the circumferential direction in a thick wall that is sandwiched between sliding contact surfaces on both the front and back surfaces on which a pair of opposing friction pads are pressed. A plurality of narrow grooves are formed in each of the sliding contact surfaces of the front and back surfaces that are in contact with the friction material, extending from the sliding contact surface to the internal air circulation hole and from the radially inner edge to the outer edge of the sliding contact surface. Also, a disc rotor characterized in that these narrow grooves are arranged alternately on both the front and back surfaces.