| 摘要 |
A power transmission comprises a plurality of inner gears 2 with an inner flexible tubular cavity 3 filled with ferrofluid and the inner gears 2 have double helical inner and outer teeth 5, 6. A plurality of pinion gears 14 mesh with teeth of 5, 6 of the inner gears 2 and outer gears 7. A controller (11, fig 1) takes input from position sensors and monitors a current output of a traversing permanent magnet. The controller (11) controls a plurality of switches (27) to allow or block current to electromagnetic coils (12) which activates the ferrofluid so that it undergoes a density change and becomes weighted on a portion of inner gears 2 and causes a centre of gravity to shift. Any changes due to friction losses can be monitored and the ferrorfluid is activated accordingly so as to counter-balance abrupt inertia differences. A method of controlling the power transmission is also claimed.
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