JPS60505Y2 - disc brake device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc brake device designed to prevent overheating of brake hydraulic fluid.

A disc brake device has a pair of pads on both sides of a disc that is integrated with the rotating body, and these pads are pressed against the disc by a hydraulic cylinder installed in a caliper.
The frictional force is used to brake the rotation of the disk, and therefore, during braking, frictional heat is generated by the friction.

Since the pad is made of a material that is difficult to conduct heat, such as asbestos, this heat is transferred to a disc made of a material with good thermal conductivity such as steel, and then radiates from the circumferential surface of the disc. It is transmitted to the caliper installed across the plate.

As a result, the caliper is heated, the cylinder that is integrated with it, and the brake hydraulic fluid inside the cylinder are heated, and the temperature of the hydraulic fluid increases, making vapor lock more likely to occur, inhibiting normal brake operation, and impeding safe driving. There is a possibility that it will come.

For this reason, conventionally, as shown in FIG. 1 and FIG.
The flange portion 11 is formed with a thick wall, and ventilation holes 12, 12, .
A configuration is adopted in which a plurality of . . There is.

However, although this configuration is excellent in terms of the cooling effect of the rotating disk 10 by the passing air, the centrifugal force accompanying the rotation of the rotating disk 10 causes the inside of the ventilation holes 12, 12, . . . The air passing from the side to the outside is passed through the ventilation holes 12,
12 .

The present invention has been developed in view of the above, and aims to prevent the caliper from overheating while maintaining the disc cooling effect of the disc brake, thereby preventing a decrease in brake operating performance due to a rise in brake hydraulic fluid. In order to achieve this objective, a pair of rotary discs, which rotate together with the rotary body and have a roughly hat-shaped shape with a hollow inside, are arranged oppositely on both sides of the flange part. a caliper that presses the pad of the flange against the flange;
A disc brake device comprising a vehicle body-side fixing member that slidably supports the caliper, and a plurality of cooling ventilation holes that penetrate the flange portion in a radial direction and communicate the hollow portion and the caliper side, A shielding plate is provided extending from the vehicle body-side fixing member so as to face the hollow side opening of the cooling ventilation hole and cover the circumference of the flange portion corresponding to the caliper. The main objective is to obtain a disc brake device characterized by the following.

The present invention will be explained below with reference to embodiments shown in the drawings.

In FIGS. 3 and 4, reference numeral 2 denotes a caliper that has a built-in cylinder and presses a pair of pads 3 and 4 against the rotating disk 10, and is supported by a torque receiving member 20 so as to be movable in the disk thickness direction. .

This torque receiving member 20 is connected to an automobile C as shown in FIG.
It is fixed to the knuckle N, which is a fixing member on the vehicle body side, in the wheel W section.

The rotating disk 10 attached to the wheel W side is bent at its center and has a hat-shaped shape with a hollow portion 21.
Its center portion 13 is fixed through the wheel hub and rotates together with the wheel.

The flange portion 11 of the rotary disk 10 to which the pads 3 and 4 are pressed is formed to have a larger wall thickness in the axial direction than the inclined portion 14 as shown in FIG. As shown in the cutaway diagram, the hollow portion 21 is visible from the radial direction of the flange portion 11.
A plurality of cooling ventilation holes 1 are provided so as to penetrate through the thick portion.
2 and 12 are provided.

15 is a shielding plate that is a feature of the present invention, and a rotating disk 10
It is fixed by means such as welding to a part of the plate-shaped member 16 that is completely attached to the knuckle N, which is the vehicle body side fixing member, on one side.

This shielding plate 15 is a shielding plate that faces the opening on the hollow side of the cooling ventilation hole and covers the circumference of the flange portion 11 corresponding to the caliper 2 on the vehicle body side. It extends from a plate member 16 attached to the knuckle N, which is a fixed member, and is formed into an arc shape having a central angle θ along the shape of the flange portion 11.

According to this configuration, as the rotating disk 10 rotates, air passes through the cooling ventilation holes 12, 12, . . . to cool the rotating disk 10 itself. At the circumferential portion where the plate 15 is formed, the opening of the hollow portion 21 of the ventilation hole rotated to the portion is covered by the shielding plate 15, so that air passage is inhibited.

That is, in the rotating region where the shielding plate 15 is formed, almost no air passes through the ventilation holes 12, 12, . . . , so that the sliding portion 11 is not cooled.
This prevents the heated passing air from colliding with the caliper 2.

This effectively prevents the caliper from overheating due to passing air.

Note that cooling by the passing air is not performed in the area where the shielding plate 15 is provided, but this is only a part of the circumference of the rotating disk, and is only a temporary phenomenon for each circumference. Therefore, this does not impede the cooling effect of the entire rotating disk.

Here, in this embodiment, the shielding plate 15 is replaced by the rotating disk 10.
Although the shielding plate 1 extends approximately at the same central angle as the caliper 2 in the circumferential direction, depending on the rotation speed of the disc, the shielding plate 1
Since the air flowing into the cooling ventilation holes 12 may collide with the caliper in areas where the cooling vents 12 are not provided, it is preferable to make the center angle of the shield plate somewhat large.

In summary, according to the disc brake device of the present invention,
A plurality of cooling ventilation holes are provided through the flange portion of the rotary disk 10 having a hat-shaped shape in the radial direction, and are provided through the hollow portion and the caliper side. By providing a shielding plate that obstructs air inflow into the cooling ventilation hole over or near the circumferential portion of the rotating disk that is substantially opposite to the cooling ventilation hole, the air flow through the ventilation hole is Collisions with the caliper can be suppressed or prevented, and the caliper can be prevented from overheating without significantly impairing the cooling effect of the entire rotating disk, which is a great practical effect.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing a state in which a disc brake device is applied to a wheel portion, Fig. 2 is a sectional view of a conventional device, and Fig. 3 is a sectional view of the device of the present invention, a part of which is shown by imaginary lines. , FIG. 4 is a schematic side view showing the side configuration. 1...Disc brake, 2...Caliper, 3.4...Pad, 10...Rotating disc, 12...For cooling Ventilation hole, 15...
...Shielding plate, 21...Hollow part.

Claims (2)

[Scope of utility model registration request] (1) A caliper that rotates together with the rotating body and operates a pair of pads facing each other on both sides of a flange of a rotating disk having a substantially hat-shaped shape with a hollow inside to press against the flange; A disc brake device comprising a vehicle body-side fixing member that slidably supports the caliper, and a plurality of cooling ventilation holes that penetrate the flange portion in a radial direction and communicate the hollow portion and the caliper side, A shielding plate extending from a fixing member on the vehicle body side faces the opening portion of the cooling ventilation hole on the hollow side and covers the circumferential portion of the flange portion corresponding to the caliper. A disc brake device featuring: (2) The disc brake device according to claim 1, wherein the shielding plate is provided in the hollow part of the hat-shaped rotating disc and is formed in an arc shape along the shape of the flange part. .