TRANSMISSION

PROBLEM TO BE SOLVED: To simplify a hydraulic fluid supply structure to respective transmission units, in a transmission having a transmission case separately arranged on the other side in the longitudinal direction of a vehicle from a driving source, a traveling system hydraulic switching unit stored in the transmission case, a hydraulic PTO clutch unit and a hydraulic auxiliary driving wheel switching unit. SOLUTION: An oil passage block is arranged on a first end wall on one side in the longitudinal direction of the vehicle of the transmission case. The oil passage block is provided with first and second valve arranging areas for installing a plurality of switching valves corresponding to the transmission units, and a supply oil passage having one end part and the other end part respectively overlapping with the first and second valve arranging areas when viewed in the axial direction of a traveling system auxiliary output shaft and formed in a substantially semicircular arc shape of extending around the axis of the auxiliary output shaft in a state of surrounding an upper part of the auxiliary output shaft between the one end part and the other end part. COPYRIGHT: (C)2008,JPO&INPIT