| 摘要 |
The present invention relates to a transmission unit for relaying drive from a crankshaft of an internal combustion engine to engine ancillaries. The transmission unit (10) comprises: a casing (13) which is mountable on an end face of the internal combustion engine or which is an integral part thereof; an input shaft (12) rotatable in the casing about an axis of rotation, the input shaft being connectable to or an integral part of the crankshaft of the engine; an output pulley (11) for outputting drive from the transmission unit to an engine ancillary; an epicyclic arrangement of sun gear (40), planet gears (19), a planet carrier (20) and an annulus gear (14) via which drive can be relayed from the input shaft to the output pulley; a one-way clutch (30) operable between the output pulley and the input shaft to allow relative rotation therebetween in one direction only; and a hydraulic braking mechanism (44) for selectively braking the epicyclic arrangement of gears. |
