One-way clutch

A one-way clutch which is interposed between a first rotary member and a second rotary member which relatively rotate and transmits a torque only in one direction, comprising:

• an outer race connected to said first rotary member;
• an inner race which is coaxially arranged on the inner side of said outer race via a predetermined ring-shaped gap and is fixed to said second rotary member;
• a plurality of sprags which are assembled in the ring-shaped gap between said outer race and said inner race and are arranged in the circumferential direction;
• a retainer in which retaining holes for enclosing said plurality of sprags are formed at predetermined intervals in the circumferential direction and said sprags are arranged at a predetermined pitch in the circumferential direction in the ring-shaped gap between said outer race and said inner race in a state where said sprags are respectively assembled in said retaining holes from the inner side;
• a ring-shaped return spring for urging said plurality of sprags assembled in the retaining holes of said retainer in the radial direction from the inner peripheral side and for rotating said sprags in a direction such that the outer race and the inner race come into engagement with each other;
• a friction plate which is sandwiched between said outer race and said first rotary member in a state where said friction plate is fixed to an end surface of said retainer and which generates a frictional force for restricting a slide of said retainer and said sprags for said outer race;
• retaining grooves which are formed on end surfaces of said plurality of sprags locating on the friction plate arrangement side and extend in the circumferential direction;
• and
• a plurality of retaining members which are positioned so as to be projected from said friction plate into the retaining grooves of said sprags and restrict a drop-out of each sprag upon assembly.