Vehicle hydraulic systems

Details Vehicle hydraulic systems Vehicle hydraulic systems

1984-04-23

1986-12-02

Hershkovitz, Abraham

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

605473, 91450, 91532, F15B 910

Patent

active

046256253

ABSTRACT:
In a vehicle hydraulic system of the open center kind, hydraulic fluid for operating vehicle services is circulated continuously, normally by an engine-driven pump. A closed center booster which requires a substantially constant pressure differential to operate it, is included in the open center system, the pressure differential being provided by a fixed restriction. The fixed restriction may be operative when the pump is operative, or only when the booster is operative. The booster is arranged so that in operation, high pressure fluid entering a boost chamber displaces an equal volume of fluid from a forward chamber into the system. The booster may also include a one-way valve allowing flow of fluid from the forward chamber to the boost chamber.

REFERENCES:
patent: 3677002 (1972-07-01), Fulmer
patent: 4135435 (1979-01-01), Adachi
patent: 4196592 (1980-04-01), Nomura
patent: 4338855 (1982-07-01), Ideta
patent: 4373424 (1983-02-01), Adachi
patent: 4420934 (1983-12-01), Udono
patent: 4423598 (1984-01-01), Ideta
patent: 4467700 (1984-08-01), Udono
patent: 4468927 (1984-09-01), Farr

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