Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1993-10-22
1995-10-24
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60452, 91516, F16D 3102
Patent
active
054600006
ABSTRACT:
A hydrostatic drive system having consumers (6, 8) connected to a demand regulated pump (1) and actuated by a directional control valve (5, 7) is disclosed. The consumers can be connected downstream of the control valves via return valves to a load-sensing line (12). To provide for load-independent allocation of the delivered flow when the consumers are simultaneously actuated, each directional control valve (5, 7) is assigned a pressure balance (9, 10) which can be controlled directly or indirectly by a signal difference formed from a load pressure signal and a delivered pressure signal. To enable one or more of the consumers (6) to be supplied with pressure medium on a priority basis, so that no reduction in the speed of movement occurs, a priority valve (20) is connected into the LS-line (12) in such manner that in a first operating position of the priority valve (20) the line sections (12b) downstream of the non-return valve(s) of the non-priority consumer(s) (8) are connected to the LS-line (12), and in a second operating position they are connected to a line (4a) which conveys the delivered pressure of the pump (1).
REFERENCES:
patent: 4938023 (1990-07-01), Yoshino
patent: 5063742 (1991-11-01), Yoshimatsu
patent: 5134853 (1992-08-01), Hirata et al.
patent: 5209063 (1993-05-01), Shirai et al.
Linde Aktiengesellschaft
Lopez F. Daniel
Shaffer Thomas R.
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