Abstract: A shifter includes an actuator incorporating a shape memory alloy wire to control movement of lever-position-controlling components of a vehicle transmission shift lever. In one arrangement, the actuator controls movement of a cam to prevent moving a pawl out of park position until predetermined vehicle conditions are met. Alternatively, the actuator can be directly attached to the pawl itself for controlling movement of the pawl, or connected to a toggle linkage arrangement for controlling movement of the pawl. In still another arrangement, a magnet arrangement is used to motivate a pawl-blocking member. When necessary, a mechanical fuse is operably connected to the system to prevent damage to the shape memory alloy wire where there is risk of the pawl being frictionally stopped from movement despite the contraction of the shape memory alloy wire actuator.

Abstract: A shift mechanism including a base, and a shift gate having a plurality of notches defining gear positions. A shift lever is movably mounted to the base. The shift mechanism includes a pawl configured to move between an engaged position wherein the pawl engages the shift gate and restricts movement of the shift member, and a disengaged position. The pawl is biased into the engaged position. The shift mechanism further includes a linkage disposed in the shift lever and coupled to the pawl for shifting the pawl between the engaged and disengaged positions. A button on the shift lever is operably connected to the linkage such that the button can be pushed to selectively move the pawl from the engaged position to the disengaged position.