Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-07-27
2000-10-03
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031161, 3031171, 3031191, B60T 844
Patent
active
06126248&
ABSTRACT:
In a hydraulic brake device, a pressurizing chamber receives a master cylinder pressure generated by a master cylinder. A pressure adjusting chamber receives an accumulator pressure generated by a high pressure source. A booster piston is movably provided between the pressurizing chamber and the pressure adjusting chamber. The booster piston is actuated in a first direction away from the pressurizing chamber by a pressure in the pressurizing chamber and actuated in a direction opposite to the first direction by a pressure in the pressure adjusting chamber. A flow control mechanism responsive to a movement of the booster piston is provided. The flow control mechanism makes the pressure adjusting chamber open to the high pressure source when the booster piston is moved in the first direction exceeding a predetermined distance, and closes the pressure adjusting chamber to be cut off from the high pressure source when the booster piston is moved in the opposite direction back to an initial position. The hydraulic brake device allows a boosted pressure in the pressure adjusting chamber to be produced based on the accumulator pressure when a malfunction in an electrical system is detected, and supplies the boosted pressure into a wheel cylinder.
REFERENCES:
patent: 4869560 (1989-09-01), Nishii
patent: 4877296 (1989-10-01), Leiber et al.
patent: 5061016 (1991-10-01), Hirobe
patent: 5171072 (1992-12-01), Maehara
patent: 5462343 (1995-10-01), Yoshida et al.
Kawahata Fumiaki
Ohkubo Masayasu
Oberleitner Robert J.
Sy Mariano
Toyota Jidosha & Kabushiki Kaisha
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