Hydraulic drive system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 17, 1997
Grant Date -
N/A
app pub date -
Jun 9, 1995
filing date -
Jun 13, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic drive system includes a first driven hydrostatic machine adjustable in volume and operating as a pump supplying fluid to a supply line for maintaining an impressed pressure therein, a second hydrostatic machine which is adjustable in volume and is connected to the supply line, a valve determining the direction of rotation and the speed of the second machine by adjusting a control flow defining a desired speed value, a signal generator coupled to the second machine for generating a control flow defining an actual value of the speed, a pilot controlled valve for comparing the actual value control flow and the desired value control flow and generating a pressure difference therebetween, and an adjusting cylinder controlled by the pressure difference for setting the pivotal angle of the second machine. To increase the load stiffness and stability of the control system a hydraulic compensating volume is connected to either side of the signal generator. The compensating volume may be defined by either a hydraulic accumulator or by a compensating cylinder including a piston. The compensating volume may be provided with a resilient bias force.
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