Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1982-05-20
1984-11-06
Stoner, Jr., Bruce H.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181A, 303 61, B60T 802
Patent
active
044808771
ABSTRACT:
A recirculating pumping device for an anti-locking two-circuit motor vehicle brake system, with the pumping device including one pump piston provided for each brake circuit. The pumping device recirculates brake fluid released from the wheel brake cylinder or cylinders to a master brake cylinder during an anti-locking regulating or control process. The pumping device includes piston pumps, with one pump being provided for each braking circuit of the braking system. The piston pumps are constructed as free piston pumps having working chambers connectable periodically to a pressure source provided on the vehicle through a valve. The valve is switchable at a predetermined switching frequency or may be vented to the tank of the pressure source. The pistons are preferably constructed as stepped pistons, so that the recirculating pumping device may be adapted to the pressure level of a pressure source already available on the vehicle by an appropriate selection of a ratio between the piston surfaces of the pistons.
REFERENCES:
patent: 3836208 (1974-09-01), Wienecke
Daimler-Benz Aktiengesellschaft
Oberley Alvin
Stoner Jr. Bruce H.
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