Friction clutch

A friction clutch transmitting a drive force of an engine, the friction clutch comprising:

• a clutch housing adapted to be driven to rotate by the engine, the clutch housing including a first plate;
• a clutch boss including a second plate, the second plate being operatively disposed relative to the first plate in a predetermined direction;
• a pressure plate arranged to rotate with the clutch housing, the pressure plate configured to press the first plate into the second plate by moving in the predetermined direction;
• a clutch spring operatively coupled to the pressure plate and applying a biasing force via the pressure plate in a direction of causing the first plate and the second plate to contact each other;
• a retainer having a substantially circular shape mounted onto the clutch housing away from the pressure plate and receiving a reaction force to the biasing force of the clutch spring by supporting one end of the clutch spring opposite the pressure plate;
• and
• a retaining ring having a substantially annular shape with a notch extending therethrough in a radial direction, the retaining ring being fitted into an inner peripheral side of the clutch housing and configured to secure the mounted retainer on the clutch housing;
• wherein
• the retainer ring is arranged within the clutch to be suppressed from deforming radially inward.