Patent ID: 8201470

Claim:
An electronically controlled transmission having a return-type shift pattern connected to a crank shaft of an engine via a clutch, the transmission comprising: a main shaft for rotating in accordance with rotation of the crank shaft via the clutch; a drive shaft for rotating in accordance with rotation of the main shaft; a plurality of first gears for rotating about the main shaft; a plurality of second gears for rotating about the drive shaft to engage the plurality of first gears; a plurality of shift forks for moving a gear of the plurality of first gears in an axial direction of the main shaft and moving a gear of the plurality of second gears in an axial direction of the drive shaft; a shift cam provided with a plurality of grooves, the shift cam for executing a designated rotation about an axis thereof; a clutch actuator for operating the clutch; a shift actuator for rotating the shift cam; a control device for electronically controlling the clutch actuator and the shift actuator, wherein a plurality of shift steps associated with the electronically controlled transmission are set in accordance with at least a shape of the plurality of grooves, a neutral position of the electronically controlled transmission is set below a lowest step of the shift steps, a rotation angle of the shift cam between the neutral position and the lowest step is different from that between any adjacent shift steps, and the control device electronically executes prevention control that electronically prevents the shift cam from rotating between the neutral position and a highest step of the shift steps.