Patent ID: 8657713
Filing Date: 2014-02-25
Classification: F16H

Abstract:
1. A power train for a tractor, the tractor comprising a vehicle body having a forward end and a rear end, comprising: an engine positioned at the forward end of the vehicle body; an engine power transmission shaft extending along a longitudinal direction of the vehicle body rearwardly of the engine; a hydrostatic stepless speed changer unit (HST) configured to receive input power from the engine, said HST having a pump and a motor that are juxtaposed along a transverse direction of the vehicle body as seen in a plan view of the vehicle body; a planetary gear unit disposed rearwardly of said HST in the longitudinal direction of the vehicle body and configured to input power from the engine via said engine power transmission shaft and power from said HST and to output a traveling power; and a branch transmission mechanism disposed forwardly of said HST in the longitudinal direction of the vehicle body and configured to distribute the power from the engine to an input shaft of said pump and to said engine power transmission shaft, wherein the branch transmission mechanism is disposed within a clutch housing connected to a rear portion of the engine, the HST is disposed within a stepless speed changer case having its front portion connected to a rear portion of the clutch housing, and the planetary gear unit is disposed within a transmission case connected to a rear portion of the stepless speed changer case.