| 摘要 |
A ultra-low stiction torque transfer device (10) having a pair of relatively rotatable members (14, 16) actuated by a fluid-actuated diaphragm actuator (72). The diaphragm (72) features a circular or annular planar extensible web (74) having an O-ring (76, 78) positioned at each peripheral edge hereof for sealing a fluid communication space (86). Each O-ring (76, 78) is received, but not clamped, between a groove (87, 89) having an inclined wall (107, 109) and a lip (88, 90) overhanging the groove (87, 89). A portion of each O-ring (76, 78) makes a sealing contact with the respective inclined wall (107, 109) to seal the fluid communication space (86). The web (74) is extended by the application of fluid pressure to the fluid communication space (86). The extending web (74) moves a piston (18) which urges the relatively rotatable members into frictional engagement. As the web (74) extends, each O-ring (76, 78) rotates and translates within its respective groove (87, 89). The lips (88, 90) retain the rotating and translating O-rings (76, 78) within the interior of the groove (87, 89) and sealingly engaged with the inclined walls (107, 109). The relatively rotatable members (14, 16) may include cooling holes (118) that provide a flow of cooling air.
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