Patent ID: 8707814

Claim:
A shift mechanism that moves shift forks connected to a gear of a transmission and changes a gear position of the transmission, the shift mechanism comprising: a shift cam that has, on an outer periphery, cam grooves to which the shift forks are connected, and rotates at a predetermined rotation angle and moves the shift forks at a certain rotation angle; a cam phase holding section that holds the shift cam at phases determined per the certain rotation angle; a rotating section that is provided so as to be able to rotate in forward and reverse directions from a reference rotation position, and rotates and moves the shift cam through the certain rotation angle; a transferring section that rotates by section of motor rotation, rotates in one of the forward and reverse directions from the reference rotation position, and, by transferring that rotation to the rotating section, rotates the rotating section; a regulating section that, while the transferring section is rotating in one direction in response to the motor rotation, regulates the rotation of the rotating section until the transferring section has reached a predetermined rotation angle, and allows the rotation of the rotating section at or above the certain rotation angle; a bias accumulating section that comprises a biasing member that increases bias following an increase in a rotation angle of the transferring section in the one direction; and an accumulated torque releasing section that, when the rotation angle of the transferring section reaches the predetermined rotation angle, releases the bias accumulated in the bias accumulating section and transfers torque to the transferring section, wherein the rotating section makes the shift cam held by the cam phase holding section rotate by the rotation caused by the accumulated torque releasing section.