Power change-over mechanism of a vehicle for industrial machinery

Claim 1

A power change-over mechanism of a vehicle for industrial machinery including a first driving shaft and a second driving shaft arranged on the same axis center, a high-speed gear and a low-speed gear fitted in said first and second driving shafts respectively, splines formed on said both shafts and both gears, a power change-over annular spool disposed between the both gears freely slidingly operably in the axial direction, splines formed on said spool, the low-speed gear being interconnected through the spool to the first and second driving shafts when the spool is at a four-wheel drive position, and the high-speed gear being interconnected through the spool to the first driving shaft when the spool is at a two-wheel drive position; characterized in that the spool comprises an outer peripheral side member having splines meshing freely with the splines of said gears, an inner peripheral side member having splines meshing freely with the splines of said driving shafts, said outer peripheral and said inner peripheral side members are spline connected to each other and are relatively movably in the axial direction and at the same time, and a stopper mechanism limiting said axial movement within a prescribed range, and that said power change-over mechanism further includes an urging means for moving the outer peripheral side member in a desired direction of operation to obtain said drive positions.