Patent ID: 8597156

Claim:
A one-way clutch of an inscribed gear type comprising: a cylindrical outer member having an inner gear at an inner circumference thereof; an inner member rotatably disposed in an inside space of the inner gear, and having gear receivers opened toward an outer peripheral side and a lock edge on one side in a circumferential direction of the gear receiver; and a planetary gear received rollably in each of the gear receivers to mesh with the inner gear; wherein when the inner member is rotated in one direction with respect to the outer member, the planetary gear is displaced on one side in the circumferential direction inside of the gear receiver according to the rotation to engage a gear root of the planetary gear to the lock edge, and by the engagement, the planetary gear is disabled from rolling to connect the outer member and the inner member in a torque transmission relationship, when the inner member is rotated in the other direction with respect to the outer member, the planetary gear is displaced on the side in the other circumferential direction inside of the gear receiver according to the rotation to release the engagement of the lock edge and the gear root of the planetary gear, and the planetary gear is enabled to roll to allow the rotation relative to the outer member and the inner member and release the torque transmission relationship therebetween, shafts are projecting from both ends of the planetary gear in an axial direction; and bearing recesses are formed on both end walls in the axial direction of the gear receiver to be released on the outer peripheral side of each of the inner members to receive the shaft, and by the engagement between the shafts and the bearing recesses, the planetary gear allows a circumferential displacement within a predetermined range with respect to the inner member required for engaging to or disengaging from the lock edge, and the planetary gear is prohibited from being displaced inward in a radial direction of the inner member.