| 摘要 |
A pneumatic high speed motor comprises a stator housing ( 10,26 ), a rotor ( 20 ) journalled in the stator housing ( 10,26 ), a pressure air inlet passage ( 33,34 ), a speed governor valve ( 28 - 31 ) shiftable between an open position and a closed position for controlling the pressure air flow through the pressure air inlet passage ( 33,34 ), and a spring ( 38 ) arranged to continuously bias the speed governor valve ( 28 - 31 ) in the direction of the open position, wherein an air compressor ( 46 ) is driven by the rotor ( 20 ) and delivers a speed responsive output pressure, the speed governor valve ( 28 - 31 ) includes a valve element ( 29 ) with an activating surface ( 44 ) acted upon by the output pressure of the air compressor ( 46 ), thereby accomplishing a shifting of the speed governor valve ( 28 - 31 ) in the direction of the closed position against the bias force of the spring ( 38 ) at rotor speed levels exceeding a desired operating speed level.
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