Shift-by-wire transmission

A shift-by-wire transmission system comprising:

• a gearbox configured and arranged to receive a rotational input and provide at least one select rotational output, the gearbox including a plurality of gear assemblies operationally coupled together to provide the at least one select rotational output from the rotational input;
• a shift drum assembly operationally coupled to the plurality of gear assemblies to selectively change gearing of the gearbox;
• an electric motor operationally coupled to the shift drum assembly to activate the shift drum assembly to selectively change the gearing of the gearbox;
• and
• a spring loaded shift cam operationally coupled to the shift drum assembly, the spring loaded shift cam configured and arranged to complete a shift into a select gear without the aid of the electric motor.

A shift-by-wire transmission system comprising:

• a gearbox configured and arranged to receive a rotational input and provide at least one select rotational output, the gearbox including a plurality of gear assemblies operationally coupled together to provide the at least one select rotational output from the rotational input;
• a shift drum assembly operationally coupled to the plurality of gear assemblies to selectively change gearing of the gearbox;
• an electric motor operationally coupled to the shift drum assembly to activate the shift assembly to selectively change the gearing in the plurality of gear assemblies;
• a spring loaded shift cam operationally coupled to the shift drum assembly, the spring loaded shift cam configured and arranged to complete a shift without the aid of the electric motor;
• and
• a manual shift override member coupled between the shift drum assembly and electric motor, the manual shift override member configured and arranged to manually disconnect the electric motor from the shift drum assembly and activate the shift drum assembly without disassembling the gearbox.