JPH05164160A - Ventilated disc - Google Patents

Abstract

PURPOSE:To improve cooling effect of a ventilated disc so as to obtain a stable brake effect. CONSTITUTION:A rib 3 extends in the direction of radius, outer end of the rib 3 is formed in the forked shape, and a branch section 5a of the rib 3 is formed in such a way that it does not engage. A forked section 5b is formed in such a way that each inner wall face of an inner disc 1 and an outer disc 2 is formed in the curved or bended shape. A semi-conical groove 6 which extends from inner end to the central part in the direction of radius is provided on inner wall faces 1b, 2b to increase area of inner wall faces 1a, 1b of both discs 1, 2. A large quantity of air is taken into a vent hole 4 from an inner opening 7 of the vent hole 4 when discs 1, 2 rotate to cool both discs 1, 2, in particular, via non-engaging section of the branch section 5a.

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]

In the ventilated disk of the present invention, a branch portion of a radially extending rib having an outer end portion formed into a bifurcated shape is disengaged, and the bifurcated portion is curved or bent. In addition, each inner wall surface of the inner disc and the outer disc is provided with a semi-conical groove extending in the radial direction from the inner end portion to the substantially central portion thereof.

[0005]

Since the present invention has the above-described structure, a large amount of air is sucked into the ventilation hole from the inner opening of the ventilation hole regardless of the rotation direction of the disk, and after being forcedly blown along the rib, It is sequentially discharged into the atmosphere from the outside opening of the ventilation hole, and in particular, the inner disc and the outer disc are cooled via the non-engaging portions of the rib branch portion.

[0006]

1 to 4 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 plurality of ribs 3 extending in a radial direction, and an outer disc. A bottomed cylindrical hat portion 9 is connected to the inner peripheral edge of 2, and a large number of ventilation holes 4 are provided 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 the outer disk 2 so that the sliding surface 1a of the inner disk 1 has a larger area. It is formed smaller than the area of the sliding surface 2a of the outer disk 2. The rib 3 extending in the radial direction has an outer end formed in a bifurcated shape, the branched portion 5a formed in a non-engaged state, and the bifurcated portion 5b formed in a curved or bent shape.

The vent holes 4 communicate with each other through the branch portions 5a, and the outer openings 8 are provided between the outer edges of the forked portions 5b of the adjacent ribs 3 and between the outer edges of the forked portions 5b of the ribs 3.
a and 8b are formed respectively, and the total area of the outer openings 8a and 8b is larger than the area of the inner opening 7.
The areas a and 8b are formed smaller than the area of the inner opening 7.

An embodiment of the rib 3 is shown in FIGS.
Is a ventilated disc in which the bifurcated portion 5b of the rib 3 is concavely curved, FIG. 3 is a ventilated disc in which the bifurcated portion 5b of the rib 3 is convexly curved, and FIG. 4 is a bifurcated portion 3b of the rib.
Is a ventilated disc bent in a convex shape, and when the bifurcated portion 5b is bent or bent in a convex shape, the area of the outer opening 8a becomes larger than that of the bifurcated portion 5b curved in a concave shape, and the bifurcated portion 5b flows between the ribs The amount of air increases.

Each inner wall surface 1b, 2b of the inner disk 1 and the outer disk 2 is provided with a semi-conical groove 6 extending in the radial direction from the inner end portion to the substantially central portion thereof.
The semi-conical groove 6 increases the area of the inner wall surfaces of the disks 1 and 2.

When the disc of the present invention is rotated in one arbitrary direction, a large amount of air is blown 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 openings 8a and 8b by the centrifugal force, and the inner disc 1 and the outer disc 2 are cooled by the air, and in particular branching is performed. The both disks 1, 2 are cooled via the non-engaging portions of the portion 5.

Even if the disc of the present invention is rotated in the direction opposite to the above-mentioned direction, the same action as described above is achieved.

[0012]

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 bifurcated portion is curved or bent, and the inner disc and the outer are formed. Since each inner wall surface of the disc is provided with a semi-conical groove extending in the radial direction from the inner end portion to the substantially central portion thereof, the disc can be positioned at any position of the front and rear wheels of the vehicle regardless of whether the vehicle is moving forward or backward. Has a good cooling effect even when mounted on the vehicle, and since the same brake braking force is always generated in each disk mounted on the vehicle, a stable braking effect can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a ventilated disk according to the present invention.

FIG. 2 is a fragmentary front view showing an embodiment of an inner wall surface of a disc.

FIG. 3 is a fragmentary front view showing an embodiment of an inner wall surface of a disc.

FIG. 4 is a fragmentary front view showing an embodiment of an inner wall surface of a disc.

[Explanation of symbols]

 1 Inner Disc 1b Inner Wall 2 Outer Disc 2b Inner Wall 3 Rib 5a Branch 5b Bifurcated 6 Groove

Claims (1)

[Claims] 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 connected to each other through a radially extending rib whose outer end is bifurcated. In the ventilated disc, the branch portion of the rib is formed so as to be disengaged, the bifurcated portion is curved or bent, and the inner wall portion of each of the inner disc and the outer disc is substantially centered from its inner end portion. A ventilated disc characterized in that it has a semi-conical groove extending in the radial direction up to the part.