Patent ID: 6457546
Filing Date: 2002-10-01
Classification: A01D,B60K,B60Y,F16H,Y10T

Abstract:
A transmission mechanism for a work vehicle having a differential gear unit, an HST and a drive source which are arranged in a body of the vehicle from a longitudinal first side of the vehicle body in a first direction, toward a second side thereof in a second direction so as to drive axles positioned toward said first side, the vehicle having a work device disposed externally of the vehicle body toward the first direction, the transmission mechanism comprising:a travel power transmission path for transmitting power from the drive source to the differential gear unit via the HST, and a PTO power transmission path for dividedly transmitting the power from the travel power transmission path to a PTO unit for driving the work device, the travel power transmission path further comprising a transmission for transmitting an output of the HST to the differential gear unit, the transmission constituting a portion of the travel power transmission path and having a casing, and an input portion for receiving the power from the drive source, an output portion coupled to the differential gear unit and a travel cooperative mechanism coupling the input portion to the output portion which are housed in the casing, the HST comprising a hydraulic pump having a pump shaft extending longitudinally of the vehicle body, a hydraulic motor having a motor shaft rotatable in cooperation with the hydraulic pump, and an HST housing accommodating the hydraulic pump and the hydraulic motor therein, the pump shaft having one end extending outward from the HST housing in the second direction and being connectable to a shaft of the drive source, the motor shaft having one end extending in the first direction into the transmission casing and connected to the input portion of the transmission, and the PTO unit comprising a PTO shaft supported by the HST housing so as to extend from the HST housing in the first direction, and a PTO cooperative mechanism accommodated in the HST housing and coupling the pump shaft to the PTO shaft to provide the PTO power transmission path.