| 摘要 |
PURPOSE:To prevent a gear from coming off during powr transmission by cutting the part of the circular tip part of a control lever and by cutting one of two claws, forming a recessed part at part of a shift fork, slantingly to the control lever. CONSTITUTION:When an operator moves a control rod 12 to left, a shift fork 15 rotates around a pin 14 clockwise and a gear engaging with one end 15b of the fork 15 engages with the other gear. In this case, a claw 15c forming a recessed part 15a moves onto the cut part of the tip part 13 of a control lever 13. The claw 15C becomes parallel to the rod 12 when the fork 15 rotates, so the claw 15C and a lever tip part 13a come into surface contact with each other. In this state, even if rotational force operates as shown by an arrow 18 from the gear in process of power transmission, force for movement shown by an arrow 20 is small and the rod 12 held by a check mechanism consisting of a steel ball 17, a spring 16, and a cut part 12a never moves, thereby preventing a gear from falling off. |
