Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...
Patent
1977-07-11
1979-02-27
Cohen, Irwin C.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Second path activated in response to pressure or flow in...
60428, 60486, 13759613, F15B 1304
Patent
active
041412800
ABSTRACT:
A first control valve of a fluid circuit connecting a first pump to a fluid motor has a signal port in communication with an inlet port when the first control valve is at a selected position at which substantially the total output of the first pump is directed to the motor. A valve device connects a second pump to the fluid circuit in response to a valve spool of the first control valve being moved to said selected position. The valve device has a valve member movable between a first position at which the second pump is in communication with a tank and a second position at which the output of the second pump is combined with the output of the first pump in the fluid circuit. A device moves the valve member to the second position in response to the valve spool of the first control valve being moved to said selected position. The device includes first and second actuation devices associated with the first and second ends of the valve member. The first actuation device has a first preselected area and a first chamber in communication with the first signal port. The second actuation device has a second preselected area greater than the first preselected area of the first actuation device and a second chamber in communication with the signal port.
REFERENCES:
patent: 2728194 (1955-12-01), Clark et al.
patent: 3064426 (1962-11-01), Furia et al.
patent: 3386344 (1968-06-01), Junck et al.
patent: 3535877 (1970-10-01), Becker et al.
patent: 3847180 (1974-11-01), Kroth et al.
patent: 3969985 (1976-07-01), Grieger et al.
Caterpillar Tractor Co.
Cohen Irwin C.
Grant John W.
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