摘要 |
A torque transmission mechanism ( 1 ) comprises an outer body ( 10 ) defining a cavity ( 12 ) and an inner body ( 30 ) located at least partially inside the cavity and able to rotate therein. A plurality of rollers ( 22, 24, 26 ) located between the outer and inner bodies interact with cam surfaces ( 14 a , 16 a , 18 a , 20 a) so that rotation of the inner body in a first direction is substantially unimpeded but rotation in the opposite direction is prevented or impeded by interaction of rollers with one or more cam surfaces. One of the rollers ( 18 ) is larger than at least one other roller and is located in a recess formed in one of the outer and inner bodies. In one embodiment the recess ( 18 ) is formed in a part of the outer body which has a greater wall thickness, excluding the effect of the recess than the rest of the outer body, so that the larger roller is accommodated without adding bulk to the outer body.
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