Document Type and Number:
Japanese Patent JPS5113073
Kind Code:
A
Abstract:
A hydraulic brake booster is disclosed which uses a single fluid to both actuate the vehicle's brakes and to provide a hydraulic assist to the vehicle operator. The booster is designed for use in a vehicle hydraulic system having both a primary pressure source which is normally used to operate the brake booster, and a secondary pressure source which is used upon failure of the primary pressure source. Pressure communication is initiated between the secondary pressure source and the booster pressure chamber by a pressure differential responsive piston. One face of the piston is split into two sections, each of which is communicated to the fluid pressure in one of the vehicle's braking circuits, and the other face of the piston is communicated to the pressure level in the booster pressure chamber. When pressure is developed in either of the vehicle braking circuits in the absence of fluid pressure communication into the pressure chamber, the pressure differential responsive piston actuates a valve which initiates communication between the secondary pressure source and the booster pressure chamber. The booster further includes a sealing device which seals the pressure chamber from the valve controlling communication between the pressure chamber and the primary pressure source during operation of the booster by the secondary pressure source.
Inventors:
ZEROOMU TEII EWAADO
RICHAADO ERU RUISU
RICHAADO ERU RUISU
Application Number:
JP7381775A
Publication Date:
February 02, 1976
Filing Date:
June 19, 1975
Export Citation:
Assignee:
BENDIX CORP
International Classes:
B60T13/12; B60T13/14; B60T13/16; (IPC1-7): B60T13/16
Domestic Patent References:
| JPS465310A |
Foreign References:
| US3802195A | 1974-04-09 |