Variable ratio transmission trains

Claim 1

A variable ratio transmission gear comprising an input shaft, a first planetary gearset having a first member mounted coaxially of the input shaft and driveably connected to said input shaft, a second planetary gearset mounted coaxially with the first planetary gearset and having a first member driveably connected to a second member of the first planetary gearset, an output shaft co-axial with said input shaft and driveably connected to said second member of the second planetary gearset, a variable resistance hydraulic fluid worm pump carried on and coaxial with the input shaft driveably connected to a third member of the first planetary gearset, a stationary tube defining a chamber within which the worm of said pump rotates and a rotatable tube surrounding the stationary tube, ports in the tubes adapted to be brought into selective registry by rotation of said rotatable tube whereby rotation of the rotatable tube may selectively vary the effective overlapping areas of the ports from an open neutral position to a constant flow restricting driving position, and engaging means for preventing rotation of a third member of the second planetary gearset whereby when the rotatable tube is in said driving position and the third member of the second planetary gearset is engaged by said engaging means drive power is transmitted from said input shaft to said output shaft when the input shaft is rotated.