| 摘要 |
PURPOSE:To assure positive operation without an increase in load and with simplified constitution by providing a driving means turning a cylindrical body by about one half of pitch of a spline between cylindrical bodies fitting the spline so that they may be freely engaged and disengaged. CONSTITUTION:When a piston 51 is in a neutral position, a spline shaft 47b of a cylindrical body 47 is disengaged from a spline bore 50b of a cylindrical body 50. At this time, the oil pressure of an actuator 60 as a driving means is released, the piston 51 is operated by spring tension, the cylindrical body 47 having fork is put in turning movement by one half of pitch of the spline by means of a pin 45 of a lever 44, edges of the spline bore 50b and edges of the spline shaft 47b abut each other, and travel of the piston 51 is thus blocked. |
