JPS62200038A - Disc brake control system for vehicle - Google Patents

Abstract

PURPOSE:To prevent a secondary master cylinder from being twisted, by making a piston of the secondary master cylinder set up between a primary braking device and a bar body so as not to receive lateral force due to wear in a brake pad. CONSTITUTION:A brake disc 5 of a primary braking device 4 is tightly attached to one side of a front wheel 2 and a brake disc 7 of a secondary braking device 6 in the other side, respectively. The primary braking device 4 is of a piston opposed caliper 8 which extendedly installs a setting part 8a and supported to the body side. And, in this caliper 8, there is solidly provided with a secondary master cylinder 15 which hydraulically operates a caliper 14 of the secondary braking device 6. And, a push rod 17 pushing a piston of this master cylinder 15 is attached to the body side. Since the caliper 8 will not move in the axial direction even if brake pads 9a and 9b are worn out, the piston 16 of the master cylinder will not receive lateral force.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc brake device for a vehicle that includes a secondary brake device operated by the braking torque of a primary brake device.

[Conventional technology]

As this type of disc brake, for example,
There is a front wheel disc brake device for a motorcycle as shown in Japanese Patent No. 92082.

The brake disc of the primary brake system is fixed to one side of the front wheel, and the brake disc of the secondary brake system is fixed to the other side so that they can rotate together with the front wheel. A caliber bracket whose base end is rotatably supported by the vehicle body is provided, and a pin slide type caliper is provided on this caliper bracket, and the caliper bracket is rotated by the braking torque generated during braking operation of the primary brake device, and the front fork is rotated. The piston of the secondary master cylinder fixed on the wheel side of the front wheel is pushed by a caliper bracket to generate pressurized fluid, which hydraulically operates the caliper of the secondary brake device placed on the other side of the front wheel. It performs braking action by squeezing the brake disc of the brake device.

[Problem that the invention seeks to solve]

However, in the case of the above structure, since the secondary master cylinder is fixedly installed inside the front fork, there is a problem in that it requires time and effort to attach and detach the front wheel and to perform maintenance. Therefore, it is conceivable to install the secondary master cylinder on the caliper side of the primary brake device, but in this case, since the key 17 lever is a pin slide type caliper, the adjustment of the braking gap due to the wear of the brake pads will work. This causes the caliper and the master cylinder to move in the axial direction of the brake disc, which may cause a lateral force to be applied to the piston when the piston of the master cylinder is pushed, causing the piston to strain.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disc brake device for a vehicle in which no lateral force is applied to the piston of a master cylinder even if the brake pad is worn out.

[Means for solving problems]

To achieve the above object, the present invention provides a vehicle with a primary 7 rake device and a secondary brake Vj device, a caliper bracket whose base end is rotatably supported on the vehicle body, and a primary brake device. In a disc brake device for a vehicle that performs braking by generating hydraulic pressure in a master cylinder that hydraulically operates a secondary brake device by rotating the 11th brake device with a braking torque, a piston is opposed to the primary brake device. The vehicle is characterized in that a type caliper is provided, the master cylinder is provided on the piston-opposed type caliper, and a push rod for pushing the piston of the master cylinder is provided on the vehicle body side.

〔Example〕

Hereinafter, an embodiment in which the present invention is used as a front wheel disc brake device for a motorcycle will be described based on the drawings.

A front wheel 2 is rotatably supported by a front axle 3 between the lower ends of a front fork 1.1 disposed at the front of the vehicle body, and a brake disc 5 of a primary brake device 4 is mounted on one side of the front wheel 2. On the other side, a brake disc 7 of a secondary brake device 6 is fixed to a hub 2a of the front wheel 2 so as to rotate together with the front wheel 2.

A primary caliper 8 is arranged on the brake disc 5 side of the primary brake device 4 to perform a braking action by pinching the brake disc 5. This caliper 8 has brake pads 9a, 9 that are FJ frictionally engaged with both sides of the brake disc 5.
b, and the screws that face the pistons 10a and 10b that push these brake pads 9a and 9b, respectively!
The caliper is of the opposite type and is rotatably supported by the bracket 1a of the front fork 1 with the mounting part 8a extended, and the primary master cylinder 11 with a reservoir provided on the bar handle (not shown) is attached to the brake lever 12. A primary brake hose 13 is connected to the brake hose 13, which introduces the pressure fluid generated by the operation.

Further, the caliper 8 includes a caliper 1 of the secondary brake device 6.
A secondary master cylinder 15 that hydraulically operates the cylinder 4 is integrally provided. A piston 16 is slidably fitted into the secondary master cylinder 15 and can be pushed by a push rod 17 provided on the front fork 1.
A reservoir hose 18 for replenishing hydraulic fluid from the reservoir of the secondary master cylinder 11 and a secondary brake hose 19 for supplying pressure fluid to the caliper 14 of the secondary brake device 6 are connected.

The caliper 14 of the secondary brake device 6 has brake pads 20a and 20 that frictionally engage with both sides of the brake disc 7.
b and this brake pad 20a.

It has pistons 21a and 21b that push pistons 20b, respectively, and is provided on the front fork 1 on the brake disc 7 side.

To explain the operation of the disc brake device configured in this way, when the brake lever 12 is operated and the pressure fluid generated in the primary master cylinder 11 is supplied to the caliper 8 of the primary brake device 4, the piston 10a of the caliper 8 is ,1
0b presses the brake pads 9a and 9b against both sides of the brake disc 5 to perform a braking action. At this time, the caliper 8 is moved to the cylinder 1 in FIG. 2 due to the braking torque.
This rotation causes the secondary master cylinder 15 to
The piston 16 is pushed by the push rod 17 to generate pressure fluid in the secondary master cylinder 15, and this pressure fluid is supplied to the caliper 14 of the secondary brake device 6 via the secondary brake hose 19. The pistons 21a and 21b of the caliper 14 press the brake pads 20a and 20b against both sides of the brake disc 7 to perform a braking action.

By repeating this braking operation, even if the brake pads 9a and 9b of the primary brake device 4 are worn, the braking gap between the brake pads 9a and 9b and the brake disc 5 is such that the pistons 10a and 10b are in the direction of the brake disc 5, respectively. Since the caliper 8 does not move in the axial direction of the brake disc 5, no lateral force is applied when the screw 16 of the secondary master cylinder 15 is pushed, and the piston 16 is not pushed. The direction can be kept constant.

In the above embodiment, the primary brake device and the secondary brake device are arranged on both sides of the front wheel of the motorcycle. However, it is also possible to arrange the primary brake device and the secondary brake device on separate wheels. The present invention is also applicable to vehicles in which

〔Effect of the invention〕

As described above, the present invention provides a vehicle with a primary brake device and a secondary brake device, the primary brake device is provided on a caliper bracket whose base end is rotatably supported on the vehicle body, and the primary brake device is mounted on a caliper bracket whose base end is rotatably supported on the vehicle body. In the vehicle disc brake fitffff, which performs braking by generating hydraulic pressure in a master cylinder that hydraulically operates the secondary brake device by rotating the brake device with fIIJa torque, the primary brake device described in Oη is equipped with a piston-opposed caliber. The master cylinder is provided in the piston-opposed caliper, and a push rod for pushing the piston of the master cylinder is provided on the vehicle body, so even if the brake pads of the primary brake device wear out, the caliper remains intact. The brake disc does not move in the axial direction, and the direction in which the piston of the master cylinder is pushed can be kept constant.

[Brief explanation of drawings]

The figure shows an embodiment in which the present invention is applied to a front wheel disc brake device of a motorcycle, and FIG. 1 is a sectional front view;
Figure 2 is a partially sectional side view, Figure 3 is l1l-I of Figure 2.
It is a sectional view II. 1.1...Front fork 2...Front wheel 4.
...Primary brake device 5...Brake disc 6
...Secondary brake device 7...Brake disc 8...Piston opposed caliper 9a', 9b...
・Brake pads 10a, 10b...Piston 1
4...Caliper of secondary brake device 15...2
Next master cylinder 16... Piston 17... Push rod

Claims (1)

[Claims] 1. A primary braking device and a secondary braking device are arranged on the vehicle, the primary braking device is provided on a caliper bracket whose base end is rotatably supported on the vehicle body, and the primary braking device is operated by braking torque. In the disc brake device for a vehicle that performs a braking operation by generating hydraulic pressure in a master cylinder that hydraulically operates a secondary brake device by rotating it, the above-mentioned 1
Next, a brake device is provided with a piston-opposed caliper, and the piston-opposed caliper is provided with the master cylinder,
A disc brake device for a vehicle, characterized in that a push rod for pushing a piston of the master cylinder is provided on the vehicle body side.