Hydraulical drive system

Details Hydraulical drive system Hydraulical drive system

1982-12-28

1989-04-11

Look, Edward K.

Power plants

Pressure fluid source and motor

With control means for structure storing work driving energy

60444, 60447, 60448, 60449, F16D 3102

Patent

active

048194298

ABSTRACT:
A hydraulic drive system to actuate the piston of a cylinder unit comprises a first hydrostatic machine having variable displacement, a second hydrostatic machine mechanically coupled to said first machine and operating as a signal generator either in a pump mode or a motor mode, and a third hydrostatic machine of fixed displacement mechanically coupled to said first machine, which third machine is hydraulically connected to said cylinder unit. In response to zero speed or rotation of the drive system the piston of the cylinder unit may be stopped in any position, or, respectively, raised or lowered. The variable displacement machine may operate as a pump and as a generator in which latter case energy is recovered in lowering a load.

REFERENCES:
patent: 3095757 (1963-07-01), Thoma
patent: 3411294 (1968-11-01), Hedermann
patent: 3442181 (1969-05-01), Olderaan
patent: 3611712 (1971-10-01), Ifield
patent: 4342164 (1982-08-01), Claasen

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