GEAR TRANSMISSION STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a gear transmission structure capable of operating a shift gear smoothly mesh and allowed to obtain at a low cost. SOLUTION: The shift gear 11 is externally fitted to a part 7a having an elliptic section of a rotating shaft by a mounting hole 11a. The mounting hole 11a of the shift gear 11 is formed like a hourglass, whereby the shift gear 11 is relatively rotated to the rotating shaft at a preset angle a of rotation.