| 摘要 |
A transmission unit for use in ancillary devices of an engine comprises an input pulley 108 mounted on an input shaft 49, an output pulley 100 mounted on an output shaft 4, an epicyclic arrangement gears 51, 58, 54, a brake assembly 60,70,71,78 operable to brake a sun gear 51 of the epicyclic arrangement and a one-way clutch 53 which acts between the input shaft 49 and the output shaft 4 to allow relative rotation in only one direction. The brake assembly 60,70,71,78 comprises a plurality of flyweights 60 which when rotating apply a force acting to disengage the brake and a biasing spring 78 that applies a force acting to engage the brake. When torque is reacted by the sun gear 51 the reacted torque results in an axial force which acts to engage the brake. For a first range of low rotational speeds of the input shaft the output shaft 4 rotates at a rotational speed greater than the input shaft 49 and for a second range of high rotational speeds the one-way clutch locks the output shaft 4 to the input shaft 49 to rotate therewith. The ancillary device may be a supercharger or a turbocharger or a pump etc. |
