| 摘要 |
<p>1385928 Fluid-pressure servomotor system ROBERT BOSCH GmbH 28 Nov 1972 [7 Dec 1971(3)] 54993/72 Heading G3P An electro-hydraulic servovalve has a valve member in the form of a rotary (or reciprocating) flat disc and controls communication between a motor 101 and a supply 102 and exhaust 103. Balls in chambers 46, 47 position the disc by means of arm 48 according to the signals fed along output lines 79, 81 of an electro-hydraulic converter 75 which is provided with a movable nozzle 76 and an electric winding 93 which is energized by a signal from an amplifier 73 fed by an input signal 98 and a valve member position feedback signal 92 produced by fixed bridge-connected magnetic field dependent elements (69) and a permanent magnet surrounded by soft iron 65 rotatable with the valve member. The valve member is rotatable within an annular part (13) clamped between two outer parts (12), (14) of the housing, is pressure balanced on opposite faces and has sleeves 58, 59 extending through apertures in the disc co-operating with the work ports 24, 25. An edge filter (85) extends through an aperture (55) in the disc and is in the flow-path between the supply and the nozzle 76.</p> |
