| 主权项 |
1. A coupling assembly having an overrun mode, the assembly comprising:
first and second members including first and second coupling faces, respectively, in close-spaced opposition with one another, the first coupling face defining a reference surface, wherein at least one of the members is mounted for rotation about an axis, the first coupling face having a plurality of recesses, each of the recesses defining a load-bearing first shoulder and a ramped surface adjacent the first shoulder, the ramped surface including a convex surface portion that tangentially intersects the reference surface and that tangentially intersects the first shoulder, the second coupling face having at least one recess defining a load-bearing second shoulder; a reverse strut or radial ratchet disposed between the coupling faces of the members, the strut or ratchet being movable between first and second positions, the first position being characterized by abutting engagement of the strut or ratchet with a respective shoulder of each member and the second position being characterized by a non-abutting engagement of the strut or ratchet with at least one of the members; and a control element mounted for controlled movement between the coupling faces and operable to control position of the strut or ratchet, the control element having at least one opening which extends completely therethrough to allow the strut or ratchet to extend therethrough to the first position in a control position of the control element, the convex surface portions being operative to periodically urge the strut or ratchet towards the second position upon rotation of the first member in a first direction relative to the second member above a predetermined RPM to prevent the abutting engagement of the strut or ratchet in the overrun mode. |
