To save the time and labor required for repositioning of a crankcase with respect to a jig during post-casting machining of the crankcase in a power plant for a vehicle equipped with a swash plate type hydrostatic continuously variable transmission.
A line segment L which connects the center 01 of a driving shaft varying-speed shaft) 43 of the hydrostatic continuously variable transmission 40 to a center 02 of a ball screw (driving shaft for altering the ratio) 64 of a ratio altering mechanism is located parallel to a joint face between the crankcase 10 and a cylinder block 13, and the ratio detection sensor 121 is bolted onto an upper wall 113, under the condition that an axis C2 of a shaft 122 for detection is arranged coaxially with a revolving axis C1 of a swash plate holder 85 orthogonal to the line segment L. As a result, the axis C2 of the shaft 122 for detection is brought to be parallel to a cylinder axis C0, and the axes of machining for the crank chamber 10C and for the fitting face for the ratio detection sensor 121 are placed in parallel.
FUKUI KUNIHIKO
YOSHIDA YOSHIHIRO