Ratchet type one-way clutch and arrangement of pawl member therein

A ratchet type one-way clutch comprising:

• an outer race having a pocket on an inner circumference thereof;
• an inner race arranged on an inner diameter side of the outer race so as to be coaxial therewith, the inner race having a notch on an outer circumference thereof;
• a pawl member housed in the pocket to transmit torque between the inner race and the outer race, the pawl member having a tip portion engaging with the notch and a circular portion engaging with the pocket;
• and
• a spring urging the pawl member to the inner race, wherein
• the pocket includes a circular arc portion with which the circular portion of the pawl member engages, and a central angle of the circular arc portion engaging with the circular portion is 180 degrees or greater,
• the pawl member is arranged such that:
• a first angle facing radially inward and between a first segment between both ends of an opening of the circular arc portion and a second segment between a center of the circular portion of the pawl member and a contact point at which the tip portion engages with the notch is greater than 90 degrees, and
• a second angle facing the pawl member and between a central axis of the spring and a third segment between the center of the circular portion and a center of the ratchet type one-way clutch is greater than 45 degrees, and
• a force component of a force of the spring presses the pawl member in a direction opposite to a slip-out direction.