Multispeed epicyclic gearbox assembly - has independently rotating planetary pinions meshing with sun-wheels of different dia.

摘要

The epicyclic gearbox has more than four forward speeds. It is esp. for lorries or earthmoving machines, and comprises two gear trains one after the other coupled by a single intermediate shaft, each having a member lockable by a frction clutch. The planetary pinions each have two or more sets of teeth of different dias. meshing directly with three or more sun wheels or annuli. One of the latter forms the input member of the gear train and the remainder can be friction-braked by servo motors fixed in the housing, while the planet carrier forms the output member. Seen in the direction of power flow, an annulus meshing with the larger-dia. teeth on the planetary pinions of the first train forms the input member, while the sun wheel of the second train forms its input member and meshes with the smaller-dia. teeth of its planetary pinions.