Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1979-06-05
1981-04-28
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 92, 303116, B60T 802
Patent
active
042641110
ABSTRACT:
An anti-skid device is provided with valving which establishes a first normal pressure transmission path between the master cylinder and the wheel brake cylinders via which an anti-skid pressure reduction can be effected to prevent lock up of the wheels and a second fail safe pressure transmission path which is established in place of the first path upon a malfunction or the like in a source of hydraulic pressure associated with the anti-skid device. The valving is characterized by a valve which is held open (establishing the first pressure transmission path) by abutment with a spool formed with a bore therein. The bore is closed at this time by the stem of the valve which seats in the mouth thereof until the spool moves in response to pump failure or the like to first allow the valve to seat (closing the first path) and subsequently move sufficiently to bring the stem out of contact with the bore mouth (opening the second fail safe path without overlap with the first).
REFERENCES:
patent: 3672731 (1972-06-01), Koivuner
patent: 3963276 (1976-06-01), Atkins
patent: 4132451 (1979-01-01), Shimizu
Otsuka Yoshio
Shimizu Kazuaki
Butler Douglas C.
Nissan Motor Company Limited
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