Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1998-09-23
2000-06-20
Ryznic, John E.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60423, 60431, 60435, 60450, 60452, F16D 3102
Patent
active
060763507
ABSTRACT:
A hydrostatic drive system is provided for a vehicle, in particular an industrial truck, with a hydrostatic traction drive system (16), a hydraulic work system (13) and a hydraulic steering system (9). The invention provides a drive system that is compact and exhibits improved operating behavior during the change from traction operation to coasting operation. To supply the traction drive system (16), the hydraulic work system (13) and the steering system (9), there is a hydraulic pump (1) with an adjustable delivery volume that works in the open circuit, which pump (1) discharges into a delivery line (5), in which there is a traction drive control valve (19) for the pressurization of the traction drive system, which is connected to an outlet line (22) leading to a reservoir, and which can be connected to delivery lines (20a, 20b) leading to the traction drive system (16), whereby in both the delivery line (5) and in the outlet line (22) there are respective flow regulators (23, 24), each of which can be pressurized by the pressure upstream of the choke point of the traction drive control valve (19) in the closing direction, and by the pressure downstream of a throttle point of the traction drive control valve (19) and by a spring in the opening direction. In one embodiment of the invention, a delivery branch line (5a) branches off from the delivery line (5) upstream of the flow regulator (24) and can be brought into communication with the steering system (9) and the hydraulic work system (13).
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Linde Aktiengesellschaft
Ryznic John E.
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