| 摘要 |
The disclosure concerns pneumatic torque motor apparatus for resisting rotation of a shaft in opposite directions from a null position. The resisting torque is developed by a pair of series-connected calibration springs which are loaded by the piston of a pneumatic motor, and which act upon a drive rod which engages the shaft through flat bearing surfaces on an attached yoke and cooperating knife edges carried by a rocker member fixed to the shaft. One end of the drive rod is guided for reciprocation within the piston by a low friction head, and its tilting movement is limited by cooperating guiding surfaces on the yoke and rocker member. The head and a low friction annular member interposed between the two springs serve as seats for the calibration springs.
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