| 摘要 |
A variable speed drive wherein a first embodiment is comprised of a pivotally mounted prime mover (10) coupled to a rotary fluid output device (58), such as a fan or pump, through a variable and fixed pulley drive arrangement (50 and 52) wherein the pivotal position of the prime mover (10) and accordingly the pitch diameter of variable pulley means (50) is controlled in accordance with fluid motor means (26, 28) coupled to the prime mover (10) and which is actuated in response to a fluid feedback control signal derived from a sensed output of the rotary fluid output device (58). The pivotal motion of the prime mover (10) imparts an arcuate motion to the variable pulley means (50) which effects a speed variation of the rotary fluid output device (58) in accordance with the variation of the pitch diameter ratio of opposing variable and fixed pulley means (50 and 52). In a second embodiment, idler pulley means (82 and 84) are pivotally mounted between the prime mover (10) and the rotary fluid output device (58) and an arcuate movement is imparted to the idler pulley means by means of the fluid motor actuator means (94). The idler pulley means (82 and 84) are connected to respective opposing pulleys (96) and (98) located on the shafts of prime mover (10) and the rotary output device (58) with at least one of the pulleys of the combination being variable pulley means which acts to change its pitch diameter in response to arcuate motion of the idler pulley means and accordingly vary the speed of the rotary output device (58).
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