Clutch unit and wind power generation device

A clutch unit comprising:

• an inside rotating body which is provided on a side of one of an output shaft of a speed-up gear and an input shaft of a power generator in a wind power generation device;
• an outside rotating body which is provided on a side of the other of the output shaft and the input shaft and which is disposed radially outside the inside rotating body;
• a one-way clutch which is provided between the inside rotating body and the outside rotating body in a radial direction and which allows relative rotation of one rotating body out of the inside rotating body and the outside rotating body toward one side of a circumferential direction relative to the other rotating body while relative rotation toward the other side of the circumferential direction is restricted;
• and
• a first rolling bearing which is disposed adjacent to the one-way clutch along an axial direction between the inside rotating body and the outside rotating body in the radial direction and which relatively rotatably supports the inside rotating body and the outside rotating body,
• wherein the one-way clutch comprises:
• a plurality of engaging elements which are disposed at intervals along the circumferential direction in a space formed between an inner ring outer circumferential surface provided on a side of the inside rotating body and an outer ring inner circumferential surface provided on a side of the outside rotating body, which restrict the relative rotation toward the other side of the circumferential direction by engagement with the inner ring outer circumferential surface and the outer ring inner circumferential surface, and which allow the relative rotation toward the other side of the circumferential direction by releasing the engagement;
• and
• a ring-shaped cage which holds the engaging elements, and
• wherein a positioning member which is capable of contacting a side surface of the cage in the axial direction and which positions the cage in the axial direction is provided between the one-way clutch and the first rolling bearing, the positioning member being a member different from the one-way clutch and different from the first rolling bearing.