Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Three or more cylinders arranged in parallel – radial or...
Patent
1984-04-26
1985-10-29
Freeh, William L.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Three or more cylinders arranged in parallel, radial or...
60421, 60484, F04B 2706, F04B 122
Patent
active
045494665
ABSTRACT:
The known swash plate type oil hydraulic piston pump is improved in that three delivery slots each extending over an angular distance of about 60.degree. are formed in a valve plate along one circumference concentric with a rotary cylinder block at an angular interval of 60.degree. and the number of piston-cylinder units provided in the cylinder block is chosen to be a multiple of 6. Pressurized oil delivered through a center delivery slot is fed to one hydraulic actuator, and pressurized oil delivered through the delivery slots on the opposite sides of the center delivery slot is jointly fed to the other hydraulic actuator, whereby variations of flow rates of the pressurized oil fed to the respective hydraulic actuators can be minimized. Preferably, in order to feed more pressurized oil to a more heavily loaded hydraulic actuator, additional delivery slots are formed in the valve plate at the boundary portions between the three main delivery slots, and pressurized oil delivered through these additional delivery slots is fed selectively to a more heavily loaded hydraulic actuator or, if the both actuators are equally loaded, to both the hydraulic actuator through a pressure-sensitive switching valve. More preferably, a pulsation damper is connected across the hydraulic circuits for feeding the pressurized oil to the respective hydraulic actuators.
REFERENCES:
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patent: 3093079 (1963-06-01), Graham
patent: 3128707 (1964-04-01), Brundage
patent: 3232056 (1966-01-01), Heinrich et al.
patent: 4077746 (1978-03-01), Reynolds
Hoashi Kenzo
Uehara Kazuo
Freeh William L.
Kabushiki Kaisha Komatsu Seisakusho
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