Dry multi-disc clutch

A dry multi-disc clutch comprising:

• a clutch axis;
• a drive-side clutch outer member;
• a driven-side clutch center member;
• a plurality of friction discs interposed between said drive-side clutch outer member and said driven-side clutch center member;
• and
• a pressure plate which pushes the friction discs to transmit power from the clutch outer member to the clutch center member;
• wherein
• the clutch outer member is configured to form an axial fan by means of plural elongate outer member openings formed on a radially extending base portion of the clutch outer member, each outer member opening extending radially from a center of the base portion to the periphery of the base portion, the outer member openings arranged side-by-side in the circumferential direction of the clutch outer member so that the portions of the clutch outer member between the outer member openings form outer member fins,
• the pressure plate comprises an annular body portion and is configured to form a centrifugal fan by means of plural elongate pressure plate fins, each pressure plate fin extending axially outward from a side face of the body portion, each pressure plate fin extending from an inner peripheral edge of the body portion to an outer peripheral edge of the body portion along a curved line such that an outer peripheral end of each fin is circumferentially offset from inner peripheral end of that fin, the spaces between the pressure plate fins forming air flow passages, and
• wherein the clutch further comprises a diaphragm spring disposed on the inner peripheral edge of the annular body portion, the diaphragm spring biasing the pressure plate toward the clutch outer member.