JPH0336746Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a brake disc structure for a wet multi-disc brake.

A conventional brake disc of this type is a sintered alloy disc.

In the case of this sintered alloy disk, the temperature of the disk surface away from the oil groove became extremely high, and the cooling oil deteriorated and decomposition products adhered to the disk surface, causing a decrease in the coefficient of friction μ.

Therefore, it was necessary to maintain the disk surface temperature below a temperature that promotes oil deterioration (additive decomposition).

The present invention was developed in view of the above circumstances, and its purpose is to prevent oil deterioration due to a decrease in disk surface temperature, prevent a decrease in the coefficient of friction μ due to oil decomposition products, and also prevent contact To provide a brake disc structure capable of lowering the surface pressure of the parts and extending the life of the brake disc.

Hereinafter, the present invention will be explained with reference to the drawings. In the drawing, 1 is a brake disk, and the brake disk 1 has a core plate 2 and a disk body 3 made of a sintered body attached to both sides of the core plate 2. A large number of oil grooves 4 are formed in the radial direction on the surface of the disk body 3, and cooling holes 5 are located between the oil grooves 4 and penetrate from the inner circumference side to the outer circumference side. It is formed in such a state.

The cooling holes 5 may be formed directly on the disk body 3, or as shown in FIG. Alternatively, the disk body 3 may be formed by combining the cooling hole forming plate 6 and the core plate 2 to form the cooling hole 5.

7 in the drawing is a plate. When the brake disc 1 configured as described above is incorporated into a wet multi-disc brake and operated, the cooling oil flows not only through the oil grooves 4 but also through the cooling holes 5.

For this reason, the area through which the cooling oil passes increases, so that the oil groove 4 can be made smaller. The actual contact area between the brake disc 1 and the plate 7 increases, and in the case of discs of the same size, not only the temperature decreases due to internal cooling, but also the surface pressure at the contact portion decreases.

FIG. 3 shows the distribution of disk surface temperature at the positions of the cooling holes 5. The solid line in FIG. 3 shows the behavior of the brake disc according to the present invention, and the dotted line shows the behavior of the conventional brake disc.

As described in detail above, the present invention consists of a rotating body and a fixed body arranged concentrically on the same axis, in which multiple layers are stacked in the axial direction, and the lower half is immersed in cooling oil. In the brake disc for a wet type multi-disc brake, the disc main body 3 is attached to both sides of the core plate 2, a large number of oil grooves 4 are formed in the radial direction on the surface of the disc main body 3, and the disc body 3 has a plurality of oil grooves 4 between the oil grooves 4. Since a large number of cooling holes 5 through which cooling oil flows are formed penetrating from the inner circumference side of the disk body 3 to the outer circumference side, the following effects are expected: Even if the brake disk is thin for a wet multi-disc brake, it is possible to cool the brake disk from the inner and outer surfaces, thereby preventing oil deterioration and reducing the friction coefficient μ due to oil decomposition products.

Since the number of oil grooves formed on the surface can be reduced, the contact area between the brake disc and the plate can be increased, the area of the contact portion is reduced, and the life of the brake disc can be extended.

The cooling holes provided in the brake disc body are located between the oil grooves, and each is formed independently in the radial direction, so each brake disc always has a solid part in the thickness direction. Unlike brake discs that have a single wide-area cooling cavity, they have excellent pressure resistance, and there is no need to thicken the brake disc in order to adopt a cooling structure. Ideal as a brake disc for wet multi-disc brakes.

The brake disc consists of a core plate and a disc body attached to both sides of the core plate, and the cooling holes are provided in the disc body, making it easy to manufacture.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a wet multi-disc brake, Fig. 2 is a partially omitted longitudinal sectional view of an embodiment of the present invention, Fig. 3 is a disk surface temperature distribution diagram, and Fig. 4 is a longitudinal sectional view of a wet multi-disc brake.
The figure is a partially omitted vertical cross-sectional view of another embodiment of the present invention. 3 is the disk body, 5 is the cooling hole.

Claims (1)

[Claims for Utility Model Registration] A wet type multi-layer system in which the lower half is immersed in cooling oil, the lower half of which is stacked in the axial direction between a rotating body and a fixed body that are arranged concentrically on the same axis. This is a brake disc for a plate disc brake, in which a disc body 3 is attached to both sides of a core plate 2, a large number of oil grooves 4 are formed in the radial direction on the surface of the disc body 3, and a number of oil grooves 4 are formed in the disc body 3 between the oil grooves 4. position it,
A brake disc structure characterized in that a large number of cooling holes 5 through which cooling oil flows are formed penetrating from the inner peripheral surface side to the outer peripheral surface side of the disc body 3.