Patent ID: 7150693

Claim:
A power train for four-wheel drive vehicle comprising: a transfer device provided between a main output shaft of a main speed change device operatively connected to a driving power source and an input shaft of a differential gear device for a first driving wheel, the input shaft being disposed on a main drive-power transmission axis coaxial with the main output shaft, the transfer, device being constructed so as to transmit power including transmission along the main transmission axis; the main speed change device being an HST that includes a hydraulic pump having a pump shaft operatively connected to the driving power source, a hydraulic motor having a motor shaft functioning as the main output shaft, a PTO unit having a PTO shaft for a working machine, and an HST housing accommodating the hydraulic pump, the hydraulic motor and the PTO unit; the transfer device including an extension extending past the main speed change device in a direction orthogonal to the main drive-power transmission axis, and a PTO shaft for a second driving wheel, capable of taking out rotational power synchronized with the input shaft; the PTO shaft for a working machine being positioned on a side opposite to the hydraulic motor with respect to the hydraulic pump; and the PTO shaft for a second driving wheel being positioned on a side opposite to the hydraulic pump with respect to the hydraulic motor and supported by the extension in such a manner as to be parallel to the main drive-power transmission axis and project outward at one end thereof.