Torque limiter-incorporating one-way clutch
A length of each pocket of a cage in a circumferential direction is smaller than the sum of an outer diameter of a roller and a free length of a coil spring. The cage can rotate relative to an inner ring having cam surfaces in accordance with revolution of the rollers in an overload-applied condition, and the cage can not rotate in a direction opposite to a direction of revolution of the rollers in the overload-applied condition.
1. A torque limiter-incorporating one-way clutch comprising:
an outer ring;
an inner ring;
a roller disposed between the outer and inner rings;
a cage that includes an urging member urging the roller in a biting direction and a pocket receiving the roller;
a cam surface that defines a locking position and a free position and is formed on the inner ring; and
a recess formed in a region which is disposed beyond the locking position ofthe cam surface so that, if an overload is applied, then the roller is fitted into the recess,
wherein a length of the pocket in a circumferential direction is smaller than a sum of an outer diameter of the roller and a free length of the urging member, and
wherein an inner peripheral surface of the cage is formed so as to have a diameter substantially equal to a maximum diameter of the cam surface except in a vicinity of a spring receiving surface at which a rotation prevention portion is formed radially inwardly of a radially innermost portion of a spring retaining portion.
2. The torque limiter-incorporating one-way clutch according to claim 1 , wherein the cage can rotate relative to the one of the outer and inner rings which includes the recess.
3. The torque limiter-incorporating one-way clutch according to claim 1 , wherein the one of the outer and inner rings which includes the cam surface comprises a polygonal transverse cross-section.
4. The torque limiter-incorporating one-way clutch according to claim 1 , wherein, if the roller is disposed beyond the locking position, towards the recess, then the roller is brought into abutting engagement with a roller receiving surface of the cage.
5. The torque limiter-incorporating one-way clutch according to claim 1 , wherein the cage can rotate relative to both the outer and inner rings when the cage is in other than an overload-applied condition.
6. The torque limiter-incorporating one-way clutch according to claim 1 , wherein the recess is disposed on an opposite side of the locking position in relation to the free position.
7. The torque limiter-incorporating one-way clutch according to claim 1 , wherein if the cage is in an overload-applied condition, then the cage can not rotate in a direction of a reaction force of the urging member and can rotate in a direction opposite the reaction force of the urging member.