Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-04-22
2000-07-04
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
60578, 3031192, B60T 842, B60T 836, B60T 1108, F15B 704
Patent
active
060828315
ABSTRACT:
A brake apply system includes a modulator that has a first bore carrying a power driven dual-effect piston. The piston has a base piston surface and an augmentation piston surface. A wheel brake is hydraulically connected to the modulator through an open fluid communication route that is provided between the wheel brake and the base piston surface. A selectively open fluid communication route is provided between the wheel brake and the augmentation piston surface with a check valve mechanism positioned in the selectively open fluid communication route. An augmentation chamber is defined adjacent the augmentation surface of the dual-effect piston. The modulator includes a second bore carrying a valve mechanism that provides an open flow path between the augmentation chamber and a reservoir when pressure at the wheel brake is relatively high and that significantly restricts the flow path when the wheel brake pressure is relatively low. Through this mechanism the augmentation surface is added to the base piston surface for a dual-effect pressure generation area that increases the initial pressurization rate of the brake apply system. Advantageously, the faster the apply rate of the braking system, the greater the augmentation pressure and displacement that is available.
REFERENCES:
patent: 2291056 (1942-07-01), Pallady
patent: 2928245 (1960-03-01), Sjodin
patent: 4732001 (1988-03-01), Belart
patent: 5000523 (1991-03-01), Mikhaeil-Boules et al.
patent: 5557935 (1996-09-01), Ganzel
Baumgartner Ernst Severin
Hageman John Benjamin
Schenk Donald Edward
General Motors Corporation
Oberleitner Robert J.
Sigler Robert M.
Woller Jeffrey
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