Transmission for use as multi-speed gearing, has drive element and driven element and four planetary gear set has three elements and drive element is connected with element of primary planetary gear set

摘要

The transmission (10) has a drive element (12) and a driven element (22). The four planetary gear set (14,16,18,20) has three elements. The drive element is connected with an element of the primary planetary gear set. The driven element is connected with an element of the fourth planetary gear set. The torque transmission mechanisms are selectively engaged in combinations of three, in order to assemble eight forward gears and a reverse gear between the drive element and the driven element.