One-way clutch having lock-up function

A one-way clutch having a lock-up function, comprising:

• an outer race;
• an inner race radially spaced apart from said outer race and disposed within said outer race concentrically for relative rotation;
• a cam surface provided on one of an inner peripheral surface of said outer race and an outer peripheral surface of said inner race;
• a track surface provided on the other of the outer peripheral surface of said inner race and the inner peripheral surface of said outer race in a confronting relationship to said cam surface;
• a plurality of roller members disposed between said outer race and said inner race and adapted to transmit torque between said outer race and said inner race;
• springs biasing said roller members in one circumferential direction;
• at least one member holding said roller members and said springs at predetermined circumferential intervals;
• and
• a control member which acts on at least one of said roller members to effect lock-up control;
• wherein said control member controls said one-way clutch to lock up said one-way clutch in two rotational directions by urging said at least one roller member substantially radially of said one-way clutch into frictional engagement with the outer peripheral surface of said inner race or the inner peripheral surface of said outer race, and to lock up said one-way clutch in only one rotational direction by releasing said at least one roller member.