Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1984-11-19
1986-05-06
Michalsky, Gerald A.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60493, 60494, F15B 13042
Patent
active
045863326
ABSTRACT:
Hydraulic motors are conventionally employed in rotating the upper structure of excavators and the like. Protection from inertia induced hydraulic shock loads of some hydraulic control circuits involves the use of a separate bypass valve which continuously interconnects the motor conduits. The subject control circuit includes a pair of shunt valves each of which establishes restricted communication between the first and second motor conduits in a particular direction at their normal spring biased position. This allows limited free swing of the upper structure when the directional control valve is shifted from an operating position to the neutral position. However, shifting the directional control valve to an operating position causes the appropriate one of the shunt valves to shift to a blocking position so that no interconnection between the motor conduits exist. Thus, the disclosed control circuit causes all pressurized fluid directed into one of the motor conduits to be transmitted to the hydraulic motor for maximum efficiency.
REFERENCES:
patent: 3490606 (1970-01-01), Gordan
patent: 4194365 (1980-03-01), Stoufflet et al.
patent: 4481770 (1984-11-01), Lohbauer et al.
Caterpillar Tractor Co.
Grant John W.
Michalsky Gerald A.
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