Patent ID: 7451790
Filing Date: 2008-11-18
Classification: B27B,F03C,F15B,Y10T

Abstract:
1. A hydraulic system comprising: first and second drive units which interact with one another, the first drive unit comprising a hydraulically driven motor that is adapted to drive a varying load, the second drive unit being adapted to perform a working movement which, under the action of hydraulic flow, influences the loading of the motor; a volume of hydraulic fluid in which a substantially constant pressure is maintained; a main duct through which a flow of hydraulic fluid is directed from the volume to the motor and the second drive unit, the flow of hydraulic fluid through the main conduit being divided with a first portion of the hydraulic fluid being directed to the motor and a second, different portion of the hydraulic fluid being directed to the second drive unit; and a flow control valve located downstream of the motor and adapted for both starting and stopping the motor and, during operation of the motor, controlling the flow of hydraulic fluid through the motor so as to provide substantially a constant flow through the motor irrespective of load variations on the motor, the flow control valve further coordinating the flow of hydraulic fluid to the second drive unit.