Balanced hydraulic propulsion system

Details Balanced hydraulic propulsion system Balanced hydraulic propulsion system

1987-11-03

1988-09-13

Michalsky, Gerald A.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60427, 180 648, F15B 1306

Patent

active

047699914

ABSTRACT:
A large industrial earthmoving machine having a hydraulic propulsion system comprising at least two hydraulic motors which are powered from a source of hydraulic fluid to drive a common load. Each motor of the hydraulic propulsion system is provided with two compensating valve assemblies. Each compensating valve assembly is provided with a compensating spool and a shuttle spool to provide accurate control of the hydraulic motors. In each pair of compensating valve assemblies, there is a forward compensating valve assembly and a backward valve assembly respectively controlling forward and backward movement of the hydraulic motor. Between the both forward compensating valve assemblies and the respective hydraulic motors, the compensating valve assemblies are fluidically coupled to one another by a small hydraulic communication line that better equalizes hydraulic fluid flow to the motors and prevents domination of one forward compensating valve assembly over the other. Similarly, the backward compensating valve assemblies are provided with an identical small hydraulic communication line accomplishing the same results.

REFERENCES:
patent: 3912057 (1975-10-01), Krouse et al.
patent: 4177870 (1979-12-01), Henn
patent: 4261431 (1981-04-01), Hawbaker

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