Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1990-04-27
1991-12-31
Kwon, John T.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
913691, 91376R, 91374, 91 6, 91 31, 91 32, 605471, F15B 910
Patent
active
050761412
ABSTRACT:
A liquid pressure booster which may be used in a brake booster or the like is disclosed. A second supply passage is provided which allows a power chamber of the liquid pressure booster to communicate with an external source of pressure fluid without passing through a valve mechanism of the liquid pressure booster. A first open/close valve is operative to open or close the second supply passage, and a second open/close valve is effective to open or close a discharge passage of the liquid pressure booster. A controller controls the first and the second open/close valve. With this construction, the controller may be caused to open the first valve and to close the second valve to allow the pressure fluid to be introduced into the power chamber through the second supply passage without depressing a brake pedal to cause a forward movement of an input shaft. In this manner, the liquid pressure booster can be operated automatically, and thus such booster can be advantageously used in an automatic braking unit.
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FIG. 1 of co-pending U.S. No. 07/347,494, filed May 4, 1989.
Jidosha Kiki Co. Ltd.
Kwon John T.
Mattingly Todd
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