Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1992-01-23
1994-03-08
Look, Edward K.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60468, 91444, F16D 3102
Patent
active
052916766
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 line 13, 14 that branch off upstream and downstream.
REFERENCES:
patent: 3993158 (1976-11-01), Weight et al.
patent: 4625749 (1986-12-01), Eskildsen
patent: 4665699 (1987-05-01), Krusche
patent: 4845947 (1989-07-01), Persson et al.
patent: 4850191 (1989-07-01), Kreth et al.
patent: 5111660 (1992-05-01), Gettel
Beater Peter
Krusche Alfred
Schurawski Siegfried
Linde Aktiengesellschaft
Look Edward K.
Nguyen Hoang
Shaffer Thomas R.
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