Patent ID: 9309935
Filing Date: 2016-04-12
CPC Classification: E05Y,F16D

Claim Text:
1. A spring type one-way clutch comprising: a tubular outer member including radially inwardly facing inwardly extending flange at a first end of the outer member and having an opening at a second end of the outer member; an inner member inserted in the outer member so as to be coaxial with the outer member; a clutch spring mounted between a radially inner surface of the outer member and a radially outer surface of the inner member; and a lid closing the opening of the outer member; wherein the inwardly extending flange of the outer member has an axially inwardly facing inner tubular portion on an axially inner side surface of the flange; wherein the clutch spring comprises a large-diameter coil spring portion fitted on a cylindrical radially outer surface of the inner tubular portion with an interference fit, a radially inwardly facing transition portion extending radially inwardly from a winding end point of the large-diameter coil spring portion in a spiraling pattern in a direction in which the large-diameter coil spring portion is wound, and a small-diameter coil spring portion extending from a radially inner end of the transition portion so as to be located concentrically inside the large-diameter coil spring portion, wherein the small-diameter coil spring portion is wound, from the transition portion, in a direction different from the direction in which the large-diameter coil spring portion is wound from the transition portion, and wherein the small-diameter coil spring portion is fitted on a cylindrical radially outer surface of the inner member with an interference fit, wherein the inner tubular portion has an axial length determined such that a gap is defined between a distal end surface of the inner tubular portion and an inner side surface of the lid in which the transition portion of the clutch spring is inserted.