Patent ID: 8307968

Claim:
A one-way clutch comprising: an inner ring and an outer ring; a plurality of sprags each including cam surfaces formed to be respectively brought into contact with an outer circumferential surface of said inner ring and an inner circumferential surface of said outer ring; a cage including a plurality of pockets formed to accommodate individually said sprags to regulate a mutual position in a circumferential direction of each of said sprags; and a ribbon spring that includes pockets formed to respectively accommodate said sprags and that urges said sprags in a direction in which said inner ring and said outer ring are locked, wherein a difference in surface hardness between each sprag and each of an inner ring and an outer ring is in a range of HRC8 to HRC12 such that a surface hardness of one of each sprag and each of the inner ring and the outer ring is reduced thereby to make the cam surface of each sprag or the inner or outer ring wear down and to hinder the generation of coating.