Civil engineering and construction machinery with hydraulic driv

Details Civil engineering and construction machinery with hydraulic driv Civil engineering and construction machinery with hydraulic driv

1981-02-13

1984-10-16

Makay, Albert J.

Power plants

Pressure fluid source and motor

Having correlated or joint actuation of controller of input...

60471, 60484, 60444, 60429, F16D 3102

Patent

active

044766793

ABSTRACT:
A hydraulic drive system for civil engineering and construction machinery having at least one hydraulic pump driven by a prime mover, at least one hydraulic actuator connected to the hydraulic pump, and at least one hydraulic cylinder, the hydraulic actuator and hydraulic cylinder being adapted to operate movable members. The hydraulic drive system is provided with a hydraulic pump-motor coupled to the prime mover, a first conduit for connecting the hydraulic pump-motor to one side of the hydraulic cylinder which moves a movable member in a direction in which the potential energy thereof increases in magnitude upon feeding of liquid under pressure thereinto, a second conduit for connecting the other side of the hydraulic cylinder to a reservoir, and an arrangement for controlling the hydraulic pump-motor in such a manner that it functions as a motor when the operator operates the system to move the movable member in a direction in which the potential energy thereof is reduced in magnitude.

REFERENCES:
patent: 2312996 (1943-03-01), Bethenod
patent: 3792791 (1974-02-01), Fleming et al.
patent: 4192456 (1980-03-01), Shields et al.

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