Motors: expansible chamber type – With motive fluid valve – Inlet fluid supplemented by controlled fluid pressurized in...
Patent
1978-05-01
1980-08-12
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Inlet fluid supplemented by controlled fluid pressurized in...
137119, F15B 13042, G05D 1102
Patent
active
042167027
ABSTRACT:
A regenerative hydraulic system includes a control circuit having a pressure sensing valve therein. The valve is in fluid communication with a pump and a work cylinder causing the cylinder to be actuated at a relatively high velocity during a first increment of displacement by employing regenerative techniques which interconnect the head and rod sides of the cylinder. Pressure increases due to encountering a load are monitored, and at a predetermined value, the system switches to a non-regenerative mode in which the effective force exerted by the cylinder is substantially increased. Upon switching to the non-regenerative mode, the system is latched and will remain so until the system fluid pressure drops to a second predetermined value which is substantially smaller than the first pressure, resulting in a hysteretic control characteristic which will prevent an unstable condition. A dual rate spring is included within the valve urging it into the regenerative position. The disclosed hydraulic system can be employed in tree harvesters and virtually any other type of hydraulic system including a work cylinder or its equivalent.
REFERENCES:
patent: 827823 (1906-08-01), Starr
patent: 3073332 (1963-01-01), Strader
patent: 3335739 (1967-08-01), Rice
patent: 3759144 (1973-09-01), Ikeda
patent: 3967532 (1976-07-01), Kokaly
patent: 4024798 (1977-05-01), Schexnayder et al.
patent: 4052929 (1977-10-01), Baatrup et al.
Bechman William H.
Brundidge Clayton L.
Cohen Irwin C.
Eaton Yale Ltd.
Lewis J. G.
McCloskey R. J.
Wood D.
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