Patent ID: 7188697

Claim:
A power unit for a vehicle with an internal combustion engine, the power unit comprising: an internal engine having a cylinder block having a cylinder center axis directed substantially in the vertical direction and a crankshaft; a static oil hydraulic non-stage transmission for speed-changing the rotation from the crankshaft, the transmission including a awash plate oil hydraulic pump and a swash plate oil hydraulic motor disposed coaxially; and a speed change drive shaft for reciprocating a drive member for changing a swash plate angle of the swash plate oil hydraulic motor or the swash plate oil hydraulic pump, wherein the speed change drive shaft is disposed at a position on an upper side of the transmission and in parallel to an axis of the transmission, and a plane connecting an axis of the speed change drive shaft and the axis of the transmission does not intersect with an axis of the crankshaft, and intersects with the axis of the cylinder center axis of the cylinder block at a position on a lower side of the axis of the crankshaft while making an acute angle with the axis of the cylinder center axis of the cylinder block.