A detent mechanism 70 is provided for fixing a shift drum 58 in position at a rotation operation position where shift gears 36, 37 become engageable. The detent mechanism 70 includes a positioning rotation portion 71 formed in the shift drum 58, a positioning arm 72 engageable with a positioning action portion 74 formed in the positioning rotation portion 71 for fixing the shift drum 58 at a rotation position corresponding to a rotation operation position of the shift drum 58, and a positioning spring 73 for urging the positioning arm 72 for its engagement with the positioning action portion 74. The positioning arm 72, as being rotatably supported to a speed changing operation shaft 61 for rotating the shift drum 58, is extended from a speed changing operation shaft 61.

Provided is a transmission for a motor including: an input shaft rotating by driving force transmitted from the motor and having a plurality of pawls disposed on the outer circumferential surface; controller for controlling protrusion and retraction of the pawls; a plurality of driving gears through the centers of which the input shaft passes, which have ratchets formed on the inner circumferential surfaces thereof so as to be engaged with the pawls, and which are different in the number of gear teeth; a plurality of driven gears which are externally meshed with the driving gears and are different in the number of gear teeth; and an output unit for outputting rotary speed changed in speed by the driving gears and the driven gears.

A detent mechanism 70 is provided for fixing a shift drum 58 in position at a rotation operation position where shift gears 36, 37 become engageable. The detent mechanism 70 includes a positioning rotation portion 71 formed in the shift drum 58, a positioning arm 72 engageable with a positioning action portion 74 formed in the positioning rotation portion 71 for fixing the shift drum 58 at a rotation position corresponding to a rotation operation position of the shift drum 58, and a positioning spring 73 for urging the positioning arm 72 for its engagement with the positioning action portion 74. The positioning arm 72, as being rotatably supported to a speed changing operation shaft 61 for rotating the shift drum 58, is extended from a speed changing operation shaft 61.

An actuator apparatus includes an oil passage body including an oil passage therein, an electric actuator, a movable unit moved at least in a first direction and a second direction by the electric actuator, and an auxiliary device including an actuating member moved by hydraulic pressure of oil in the oil passage. When the electric actuator moves the movable unit in the second direction, the auxiliary device applies, through the actuating member to the movable unit, a force pointing in a direction that moves the movable unit in the second direction.

Provided is a transmission for a motor including: an input shaft rotating by driving force transmitted from the motor and having a plurality of pawls disposed on the outer circumferential surface; controller for controlling protrusion and retraction of the pawls; a plurality of driving gears through the centers of which the input shaft passes, which have ratchets formed on the inner circumferential surfaces thereof so as to be engaged with the pawls, and which are different in the number of gear teeth; a plurality of driven gears which are externally meshed with the driving gears and are different in the number of gear teeth; and an output unit for outputting rotary speed changed in speed by the driving gears and the driven gears.

An actuator apparatus includes an oil passage body including an oil passage therein, an electric actuator, a movable unit moved at least in a first direction and a second direction by the electric actuator, and an auxiliary device including an actuating member moved by hydraulic pressure of oil in the oil passage. When the electric actuator moves the movable unit in the second direction, the auxiliary device applies, through the actuating member to the movable unit, a force pointing in a direction that moves the movable unit in the second direction.

A control method and system for preventing misoperation of a shift lever of a vehicle are provided. In particular, when a driver manipulates the shift lever to select an automatic transmission mode or a manual transmission mode, shifting into an unintended mode attributable to misoperation is prevented. Therefore, the control method and system improve reliability in manipulating the shift lever and provide a safe driving environment to a driver.

A control method and system for preventing misoperation of a shift lever of a vehicle are provided. In particular, when a driver manipulates the shift lever to select an automatic transmission mode or a manual transmission mode, shifting into an unintended mode attributable to misoperation is prevented. Therefore, the control method and system improve reliability in manipulating the shift lever and provide a safe driving environment to a driver.