| 摘要 |
1321284 Controlling variable pitch propellers ESCHER WYSS Ltd 26 June 1970 [26 June 1969] 31023/70 Heading B7V [Also in Division F1] Apparatus to control the pitch of blades carried by a rotating shaft 1 comprises a known servomotor (not shown) for varying the pitch, control member 5 for controlling the supply of fluid to and discharge from the servomotor and having a neutral condition in which it renders the servomotor inactive, and a command unit 24. First actuators 26, 27 responsive to the command unit upset the neutral condition of the control member and second actuating elements 29, 30, 33, 40 responsive to the movement of the servomotor restore the neutral condition. One of the actuating sets (in the embodiment shown, the second one) includes a rotary portion 29, 30, 36, 35 within the shaft 1 and a non-rotary portion 34, 32, 33, 40 outside the shaft and is operated by hydrostatic transmission. In the embodiment shown a non-rotary ring 9 surrounds a portion of the shaft 1 and contains passages 18, 19 for handling fluid supplied to and discharged from the servomotor. |
