Motors: expansible chamber type – Application of motive fluid at different pressures to... – Double acting motor reversed by pressure variation of motive...
Patent
1988-02-17
1989-03-07
Look, Edward K.
Motors: expansible chamber type
Application of motive fluid at different pressures to...
Double acting motor reversed by pressure variation of motive...
91420, 91422, 91433, 91465, F01B 100
Patent
active
048095877
ABSTRACT:
An actuator has a pilot valve incorporated in a piston thereof which is slidably disposed in a cylinder tube, the piston having first and second piston lands slidably disposed in first and second coaxial cylinder chambers. A spool valve body has first and second spool lands slidably disposed in an inner hole in the piston. When the spool valve body is moved in one direction, a first axial passage in the piston communicates with a pressure sink through a first return port which is opened by the first spool land, and a second axial passage in the piston communicates with a portion of the inner hole in front of the second spool land through a second supply port which is opened by the second spool land. When the spool valve body is moved in the opposite direction, the second axial passage communicates with the pressure sink through a second return passage which is opened by the second spool land, and the first axial passage communicates with a portion of the inner hole in front of the first spool land through a first supply port which is opened by the first spool land. The spool valve body is movable under a differential pressure between two inlet ports. The pilot valve cam amplify the operating force on the piston even if the difference between applied input oil pressure is small. In addition, the actuator is compact in size.
REFERENCES:
patent: 2619038 (1952-11-01), Davidson
patent: 2755777 (1956-07-01), Gerwig et al.
patent: 2969044 (1961-01-01), Leduc
patent: 3302922 (1967-02-01), Gregor et al.
Iino Takashi
Ikejiri Kenichi
Iwasawa Kenjiro
Kawahara Eiichiro
Yamamoto Noboru
Honda Giken Kogyo Kabushiki Kaisha
Look Edward K.
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