Patent ID: 7624659

Claim:
A shift position sensor of an automated manual transmission, the transmission having a shift actuator that includes a cylinder and a piston that moves in the cylinder in accordance with a speed change operation of the transmission, the shift position sensor comprising: a magnet mounted in the piston to move therewith; and a magnaflux detector mounted to a fixed member of the transmission near the shift actuator to detect a magnaflux produced by the magnet, wherein the cylinder is constructed as to cover the magnet even when the piston is subjected to a stroke in the cylinder, wherein the piston is connected to a shift bracket of the shift actuator to move therewith, the connection between the piston and the shift bracket permitting a predetermined circumferential play of the piston about an axis of the piston, and wherein the magnet comprises two magnet pieces that are spaced from each other in an axial direction of the piston by a distance that is greater than a stroke distance of the piston.