Hydraulic braking system for an automotive vehicle

Details Hydraulic braking system for an automotive vehicle Hydraulic braking system for an automotive vehicle

Filed on

1994-12-21

Date issued

1996-02-20

Examiner

Butler, Douglas C.

Patent Class

Fluid-pressure and analogous brake systems

SubClass

Speed-controlled

SubSubClass

Having a valve system responsive to a wheel lock signal

Other Related Categories

3031135, 3031161, 3031191, 303DIG2, 303125, 303139, 303186, 303189, B60T 832

Type

Patent

Status

active

Patent number

054923948

Description

ABSTRACT:
The invention is directed to a hydraulic braking system having a master cylinder (10) in which a first piston and a second piston are slidably disposed to define a first pressure chamber (11) and a second pressure chamber (12). A valve device (24) is provided between the first pressure chamber and a reservoir (20). A first pressure control device (30, 31) is provided between the first pressure chamber and wheel cylinders (38, 39), and a second pressure control device (32, 33) is provided between the second pressure chamber and wheel cylinders (40, 41). A pump (27) is provided in a passage connecting the reservoir and the first pressure control device, and driven to supply a brake pressure from the former to the latter. When the valve device is actuated to block the communication between the first pressure chamber and the reservoir, and the pump is driven, the pressure in the first pressure chamber will be increased to move the second piston, so that the pressure in the second pressure chamber will be increased. Accordingly, the pressure in each wheel cylinder may be controlled by the first or second pressure control device without depressing the brake pedal.

REFERENCES:
patent: 5348381 (1994-09-01), Bernhardt et al.
patent: 5445444 (1995-08-01), Rump et al.

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