Clutch device

A clutch device comprising:

• a clutch outer that is rotatably journaled on an output shaft and has an outer bottom portion formed in an annular shape coaxial with the output shaft and an outer cylindrical portion extending in an axial direction of the output shaft from an outer peripheral edge of the outer bottom portion;
• a primary driven gear that is formed in an annular shape coaxial with the output shaft, is assembled to the clutch outer, and receives power from a power source;
• a clutch center supported on the output shaft in a relatively non-rotatable manner inside the clutch outer;
• and
• a friction member supported on the clutch outer and the clutch center in a relatively displaceable manner in the axial direction of the output shaft, the friction member having a plurality of friction plates, the friction member exerting a frictional force through mutual contact between the plurality of friction plates and transmitting a rotational force from the clutch outer to the clutch center,
• wherein
• the clutch outer has an outer shaft portion connected to an inner peripheral edge of the outer bottom portion and supported on the output shaft,
• the outer bottom portion has a gear mounting portion inserted inside the primary driven gear and fitted to the primary driven gear in a relatively non-rotatable manner,
• the primary driven gear and the outer shaft portion are formed from a first material,
• at least one of the outer bottom portion and the outer cylindrical portion is formed from a second material, and
• the first material has higher tensile strength than the second material.