JPH051734A - Ventilated disc - Google Patents

Abstract

PURPOSE:To obtain stable braking effect by improving cooling effect of a ventilated disc. CONSTITUTION:Ribs 3, extended in a radial direction, each has an outer end which is branched into two. A branch portion 5 of the rib 3 has an unengagement structure. Columnar ribs 9 are arranged on each of a substantial center of inner wall surfaces 1b, 2b. Semiconical grooves 6 are formed on the inner wall surfaces 1b, 2b of an inner disc 1 and an outer disc 2, which grooves 6 extend in a radial direction from an inner end thereof to a substantial center portion, for enlarging an area of an inner opening 7 of an air hole 4 and a surface area thereof. When the disc 1, 2 are rotated, a large amount of air is suctioned from the inner opening 7 of the air hole 4 into the air hole 4. The suctioned air cools the discs 1, 2 through the unengagement portion of the branch portion 5 and the columnar ribs 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilated disc for a vehicle brake system and is used in automobiles, industrial vehicles and the like.

[0002]

2. Description of the Related Art As a conventional ventilated disc, there is one disclosed in Japanese Utility Model Publication No. 2-38107, in which the inner disc and the outer disc are made of smooth annular members, and the inner disc slides. The surface area is smaller than the sliding surface area of the outer disk, and both disks are connected by a large number of radially extending ribs whose outer ends are bifurcated. Are provided in large numbers.

[0003]

In the conventional disc, when the disc is rotated, new air having a larger flow rate is sucked from the inner opening of the ventilation hole and forcedly blown into the ventilation hole, and then the outer opening of the ventilation hole is exposed to the atmosphere. Although discharged, there is a problem that the bifurcated branch of the rib is not sufficiently cooled. Therefore, the present invention has been made to solve such a problem, and an object of the present invention is to improve a conventional disk to improve the cooling performance of a bifurcated branch portion of a rib.

[0004]

SUMMARY OF THE INVENTION A ventilated disc according to the present invention comprises a radially extending rib having a bifurcated outer end and a branched portion which is disengaged from the inner disc and the outer disc. Each inner wall surface is provided with a semi-conical groove extending in the radial direction from the inner end portion to the substantially central portion, and a columnar rib is further provided at the substantially central portion of both inner wall surfaces. The opening area and the surface area are formed larger than in the conventional case.

[0005]

Since the present invention has the above-mentioned structure, a large amount of air is sucked into the ventilation hole from the inner opening of the ventilation hole when the disk is rotated, and is forcedly blown along the ribs, and then the outer side of the ventilation hole. It is sequentially discharged into the atmosphere from the opening, and in particular, the inner disc and the outer disc are cooled via the non-engaging portions of the rib branch portion and the columnar ribs.

[0006]

1 and 2 show a ventilated disc according to the present invention, in which an annular inner disc 1 and an outer disc 2 are connected by a large number of ribs 3 extending in a radial direction, and an outer disc. A bottomed cylindrical hat portion 4 is connected to the inner peripheral edge of the disc 2, and a large number of vent holes 4 are formed by the discs 1 and 2 and the rib 3. The inner disk 1 and the outer disk 2 are formed to have the same outer diameter, but the inner disk 1 is formed to have an inner diameter larger than that of the outer disk 2, and the area of the sliding surface 1a of the inner disk 1 is increased. It is formed smaller than the area of the sliding surface 2a of the outer disk 2. The outer end of the rib 3 extending in the radial direction is formed into a bifurcated shape, and the branch 5 is formed in a non-engaging manner. The inner end of the inner wall 1b, 2b of each of the disks 1, 2 is formed. Is provided with a semi-conical groove 6 extending in the radial direction from the central portion to the substantially central portion, and a large number of columnar ribs 9 are provided substantially at the central portions of the inner wall surfaces 1b and 2b. 4 communicate with each other, and the area of the inner opening 7 of the vent hole 4 is formed larger than the area of the outer opening 8.

When the disc of the present invention is rotated in any one direction, a large amount of air is discharged from the inner opening 7 of the vent hole 4.
After being sucked in and forcedly blown along the ribs 3, they are sequentially discharged into the atmosphere from the outer opening 8 by centrifugal force,
The inner disk 1 and the outer disk 2 are cooled by the air, and in particular, both the disks 1 and 2 are cooled via the non-engaging portion of the branch portion 5 and the columnar rib 9.

[0008]

According to the present invention, the branch portion of the rib extending in the radial direction, the outer end portion of which is formed into a bifurcated shape, is formed disengaged, and the inner wall surface of each of the inner disc and the outer disc is provided with the inner portion thereof. A semi-conical groove extending in the radial direction from the end portion to the substantially central portion is provided, and a columnar rib is provided at approximately the central portion of both inner wall surfaces, so that the cooling effect is greatly improved.
A stable braking effect can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a ventilated disc according to the present invention.

FIG. 2 is a sectional view of a ventilated disc according to the present invention.

[Explanation of symbols]

 1 Inner Disc 1b Inner Wall 2 Outer Disc 2b Inner Wall 3 Rib 5 Branch 6 Groove 9 Columnar Rib

Claims (1)

Claim: What is claimed is: 1. An area of a sliding surface of an inner disk is formed smaller than an area of a sliding surface of an outer disk, and the both disks are arranged in a radial direction in which outer ends are bifurcated. In a ventilated disc connected via extending ribs, branch portions of the ribs are formed in a non-engaging manner, and the inner wall surface of each of the inner disc and the outer disc has a radius from its inner end portion to a substantially central portion. A ventilated disk, characterized in that a semi-conical groove extending in the direction is provided, and a columnar rib is provided at substantially the center of both inner wall surfaces.