JPS6049141A - Hydraulic disc brake device - Google Patents

Abstract

PURPOSE:To enhance the wheel parking brake effect of a car when it is parked, by providing a spring chamber in a caliper itself and utilizing its spring brake action so as to force pads to be directly pressed to a brake disc. CONSTITUTION:Pads 5, 6, oppositely facing to each other, are respectively mounted to the front end face of a piston 3, fitted into a cylinder 2 of a caliper 1, and to a pawl part 7 in the end of the caliper 1, while a brake disc 4 is arranged between the both pads 5, 6. In the above device, the caliper 1, in its side where the cylinder 2 is provided, integrally forms an air chamber 8, and a piston plate 9 is fitted to be longitudinally movable mounted in the inside of said chamber 8. In this way, the brake device, when it is used as a wheel parking brake at parking of a car, forces the brake disc 4 to be held between the both pads 5, 6 by discharging a pressure of air introduced into a front chamber 12 of the air chamber 8 and advancing the piston plate 9 by a spring 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic disc brake device.

Conventional hydrolink disc brakes with wheel parking brake mechanisms are mainly power screw type and wedge mechanism type, both of which have a spring chamber separated from the disc brake body and transmit force through a linkage, which improves efficiency. There were some difficulties. There are also models that have a separate spring brake caliper, but this has the problem of being disadvantageous in terms of weight.

The present invention provides a spring chamber in the caliper itself, and the spring brake is operated by this spring chamber.
The pad C, 1' is pressed directly against the brake disc to activate the wheel parking brake when parking, and the conventional problem described in -H is solved. ◎ The following is an example of the present invention shown in the drawings. This is explained by

A caliper 1 has a cylinder 2 into which fluid pressure is introduced, and a biston 3 is fitted into the cylinder 2 so as to be movable forward and backward. A pad 5 is attached to the front end surface of the piston 3, and a pad 6 is also attached to the claw portion 7 at the tip of the caliper 1 so as to face the pad 5. And, a brake disc 4 is arranged between both pads 5 and 6. I for the above conventional general hydraulic disc plage.
/''101 In the present invention, an air chamber 8 is integrally formed on the side of the caliper 1 where the syringe 2 is provided and pulled, and a piston plate 9 is fitted into the air chamber 8 so as to be movable forward and backward. A spring lO for moving the piston plate 9 forward is installed in the rear chamber 13 of the air chamber 8 defined by the piston plate 9, and an air pressure control device and an air pressure control device are installed in the spring 12. A connecting air pressure supply/discharge port 11 is provided.

Reference numeral M14 is a ventilation hole for allowing the inside of the rear chamber 13 to breathe due to the forward and backward movement of the piston plate 9.

Furthermore, the air chamber 8 is provided on the back surface of the piston 3.
A bushing rod 15 is integrally provided which projects into the front chamber 12 of the piston plate and comes into contact with the front surface of the piston plate.

1 of the present invention having the above configuration, when used as a service brake, the front chamber f2 of the air chamber 8 as shown in FIG.
By introducing air pressure into the cylinder 2 to hold the piston in the pre-position state, and by introducing hydraulic pressure into the cylinder 2, the pads 5 and 6 are pressed against the brake disc 4 to perform normal braking.

Furthermore, when used as a wheel parking brake during parking, the air pressure introduced into the front chamber 12 of the air chamber 8 is discharged. As a result, the spring 1o moves the piston plate 9 forward, and the bushing rod 1
5 is pushed t, and the brake pad 5.6 is mechanically pressed against the brake disc 4 to maintain the braking state.

When releasing the wheel parking brake state shown in FIG. 2, as shown in FIG. 3, air pressure is introduced into the front chamber 12 of the air chamber 8 again to move the piston plate 9 backward and compress the spring lo. do. As a result, the pushing force of the bushing rod 15 is released, and the pressure exerted on the brake disc 4 by the pad 5.6 is released.

As described above, according to the present invention, since the spring brake mechanism provided on the caliper itself directly operates the wheel parking brake when parking, the wheel parking brake using the hydraulic disc brake can be achieved extremely efficiently. It has the advantage of being

[Brief explanation of the drawing]

The drawings are cross-sectional views showing an embodiment of the present invention, in which FIG. 1 is a diagram when the service brake is activated, FIG. 2 is a diagram when the wheel parking brake is activated, and FIG. 3 is a diagram when the wheel parking brake is released. It is. 1... Caliper, 2... Cylinder% 3-e Piston, 4 Brake disc, 5.606. Pad, 8.1. Air chamber, 9° 11m piston plate, lo... spring, 15/e bushing rod. Figure 1 12 Figure 2 Figure 3

Claims (1)

[Claims] In a hydraulic disc brake, the brake disc is compressed by a pair of pads by the operation of a piston of a fluid pressure cylinder provided in the caliper. A hydrolink disc brake device comprising a bushing rod fitted with a piston plate that moves backward, protruding into the air chamber from the back side of the piston that operates the pad, and abutting against the piston plate.