| 摘要 |
A planar overrunning coupling includes a pair of coaxial, rotatable coupling plates (10, 20) situated in close proximity, and a strut retainer plate (22) disposed therebetween. Struts (38) nominally carried ins recesses (26, 28, 30, 32, 34, 36) formed in one coupling plate (20) are normally urged into engagement with recesses (48) formed in the oth er coupling plate (10) by a spring (52) disposed beneath each strut (38). The retainer plate (22) includes angularly-spaced apertures (46) such that, when the retainer plate (22) is in a first angular position relative to the one coupling plate (20), a given strut (38) extends through a retainer plate aperture (46) into engagement with the other coupling plate (10). When the retainer plate (22) is in a second angul ar position relative to the one coupling plate (20), an aperture (46) is no longer registered with the given strut (38), and the retainer pla te (22) prevents the given strut (38) from engaging the other coupling plate (10), thereby eliminating the deleterious ratcheting contact between the given strut (38) and the other coupling plate (10).
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