| 摘要 |
A multi-speed fan drive apparatus is disclosed which includes a pair of concentric shafts rotatable relative a fixed support and carrying clutch plates engageable to stop rotation of the shafts relative the fixed support. A pair of different-sized sun gears are carried on the two shafts and are intermeshed with planet gears rotatably mounted upon a planet gear carrier. Drive means is provided for driving the planet gear carrier in a given direction and a ring gear, with a fan blade connected thereto, is intermeshed with the planet gears. Means are provided for stopping rotation of one or the other of the sun gears with respect to the fixed support, and also for causing the shafts and sun gears to rotate in unison with the planet gear carrier and therefore the ring gear, to obtain three speeds of operation. Alternate embodiments are also disclosed which include different means for limiting rotation of the sun and ring gears, and in one embodiment there is included a single sun gear and planet gear arrangement providing a two-speed apparatus.
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