Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Cylinders parallel to rotation axis
Patent
1984-07-19
1986-12-09
Freeh, William L.
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Cylinders parallel to rotation axis
60911, F01B 310, F01B 1304
Patent
active
046273298
ABSTRACT:
This invention relates to an energy efficient variable displacement motor-driven power drive unit using a multi-variable feedback control system to control system output position and speed. More particularly, a variable displacement hydraulic motor connected to drive a load has a variable-position wobbler, with the position controlled by electro-hydraulic servo means including an electrically-operable servo valve which receives a control signal from signal summing means which has summed feedback signals representing speed and position of a load with a torque signal representative of wobbler position. The latter signal is mechanically inputted to the servo valve by means of a mechanical connection including a link connected to the wobbler and a spring interconnecting the link to the servo valve and with the link carrying a servo piston movable in a servo cylinder associated with the servo valve.
REFERENCES:
patent: 3429225 (1969-02-01), Keyworth
patent: 3750532 (1973-08-01), Kubilos
patent: 3812765 (1974-05-01), Himmler
patent: 3817150 (1974-06-01), Cox
patent: 4248137 (1981-02-01), Caruso
patent: 4466337 (1984-04-01), Eiler
patent: 4487109 (1984-12-01), Burandt
Freeh William L.
Sundstrand Corporation
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