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Patent Searching and Data


Document Type and Number:
Japanese Patent JPH0333922
Kind Code:
B2
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.

Inventors:
RORUFU KORUDAKU
Application Number:
JP860783A
Publication Date:
May 20, 1991
Filing Date:
January 21, 1983
Export Citation:
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Assignee:
REXROTH MANNESMANN GMBH
International Classes:
F15B21/14; F15B7/00; F15B11/04; F16H61/46; F16H61/47