| 摘要 |
When an arm (100) of a forward/reverse detection mechanism (90) rotates, a spool (82) of a change-over valve (80) in contact with the arm (100) displaces in an axial direction, and a first valve (60) and second valve (70) are selectively connected to hydraulic actuators (50, 52, 54, 56) of a transmission (10). In order to reduce the wear and friction of the arm (100), the arm (100) is formed so that a part (102) in contact with the spool (82) is an arc, and the locus (L) of the center of curvature (A) of the arc part (102) when the spool (82) is displaced, intersects with a perpendicular line (S) dropped from a rotation center (O) of the arm (100) to a center axis (T) of the spool (82).
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