Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – Condition responsive means for modifying working member...
Patent
1988-07-05
1989-11-14
Look, Edward K.
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
Condition responsive means for modifying working member...
60468, 91530, F15B 1100
Patent
active
048799459
ABSTRACT:
In a hydraulic control device having at least one distributing valve (2m, ) connected upstream of a consuming point (35), a more effective energy utilization is achieved by means of a pressure step (D) provided for the input pressure of a second throttling point (15), which can be switched in stroke-dependent fashion by means of a control element (17, 17') of the distributing valve (2, 2') so that the maximum difference in pressure between the pump line pressure P.sub.(4) and the consumer pressure P.sub.(3) is only controlled shortly before the need of a high conveying amount. Before this the difference in pressure is kept smaller.
REFERENCES:
patent: 3411295 (1968-11-01), Byers, Jr.
patent: 4739617 (1988-04-01), Kreth et al.
Brunner Rudolf
Fichtenbeiner Heiner
Heilmeier & Wienlein, Fabrik fur Oel-Hydraulik GmbH & Co. KG
Look Edward K.
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