Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1993-11-30
1995-06-06
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60493, 60494, F16D 3102
Patent
active
054211565
ABSTRACT:
A hydraulic drive system has a consumer of hydraulic power connected to a pressure medium source, e.g., a hydraulic motor 1. The consumer can be actuated by a control valve 4 throttling in intermediate positions; its width of opening is determined by a pressure difference formed at the control valve 4. The pressure difference is derived from a control pressure to be prescribed and the load pressure of the consumer. The consumer can thus be driven with a definite power or a definite torque. To limit the movement speed of the consumer, it is proposed to reduce the control pressure as a function of the speed of movement. The control pressure is present in a control pressure line 7 or 8, which empty at a charging space of the control valve 4, active in the opening direction. A drain line 16 branches from the control pressure line 7 or 8, in which a multiway valve spring-loaded in the closing direction and throttling in intermediate positions is located. It is in working connection with a measuring device that detects the movement speed of the consumer by measuring the volume stream and which is formed of a restrictor 12 located in a line 5 or 6 between the pressure medium source and the consumer, and the lines 13, 14 that branch off upstream and downstream.
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patent: 4625749 (1986-12-01), Eskildsen
patent: 4638886 (1987-01-01), Marietta
patent: 4665699 (1987-05-01), Krusche
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patent: 5291676 (1994-03-01), Beater et al.
Beater Peter
Krusche Alfred
Schurawski Siegfried
Linde Aktiengesellschaft
Look Edward K.
Nguyen Hoang
Schaffer Thomas R.
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