| 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) locat ed between the outer and inner bodies interact with cam surfaces (14a, 16a, 18a , 20a) so that rotation of the inner body in a first direction is substantiall y 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 i n one of the outer and inner bodies. In one embodiment the recess (18) is form ed in a part of the outer body which has a greater wall thickness, excluding th e 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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