POWER TRANSMISSION SYSTEM

摘要

The present invention provides a stem drive comprising an input shaft (12), an upper gear set (18) including an input gear (118) driven by the input shaft, an output gear (22) and an intermediate gear (20) which transmits drive from the input gear (118) to the output gear (22). The intermediate gear is rotatable about a horizontal axis. An inclined drive shaft (100) extends downwardly from the gear (18) set and driven by the output gear (22). A lower gear set (102) driven by the drive shaft (100). A housing (98) carries the output gear (22), the lower gear set (102) and the drive shaft (100). The housing (98) is pivotable in an arc about the horizontal axis of the gear (20). The drive can further include two co-axial shafts that are rotated in opposite directions by the gear set (18). A reversing drive (98) permits the shaft (100) to be clutched to a selected one of the co-axial shafts.