Friction clutch and automatic transmission of automobile using the same and non-stage transmission of automobile and power distribution device of automobile and power transmission device of motorcycle

A friction clutch, comprising:

• a pair of clutch members which are coaxially and relatively rotatably arranged with peripheral surfaces opposite to each other in the radial direction and in which each opposite surface is formed to be inclined from one end side toward the other end side in the axial direction;
• a lot of rollers which are arranged between the opposite surfaces of the respective clutch members;
• a holder which rotatably holds each roller mutually at intervals in the circumferential direction of each clutch member;
• and
• thrust means which can thrust in the axial direction at least one of the respective clutch members in the direction in which the opposite surfaces of the respective clutch members approach each other,
• wherein turning axes of the respective rollers are inclined to have a specific angle relative to a rotation axis of the clutch member and the angle between the turning axis and the rotation axis is made more than 3° and less than 8°, and
• the turning axes of the respective rollers are inclined in the opposite directions by specific numbers of pieces to have a specific angle relative to a plane including the rotation axis of the clutch member and the angle between the turning axis and the plane is made more than 25° and less than 90°.