| 摘要 |
Clutches of the type having spaced clutch surfaces between which sprags extend for engaging and disengaging clutch bodies which have said clutch surfaces. Each clutch sprag has a wall of uniform thickness and substantially rectangular cross section adapted to extend between the clutch surfaces of the clutch bodies with this wall terminating in a pair of opposed end surfaces adapted respectively to be directed toward the clutch surfaces. The sprag has a pair of opposed clutch-engaging portions extending laterally from opposed end regions of the sprag wall in opposite directions from and merging with the end surfaces thereof, with these clutch-engaging portions having outer convexly curved clutch-engaging surfaces of substantially equal magnitudes. The wall of the sprag is inclined with respect to a pair of parallel planes which are tangent to the opposed end surfaces of the wall. With this sprag having a substantially Z-shaped profile. The sprag is manufactured from an elongated bar of initially rectangular cross section by cold rolling the bar to provide the laterally projecting portions which extend from the opposed side surfaces of the bar which initially is of rectangular cross section and which is converted by the cold rolling into the profile of substantially Z-shape. After this cold rolling the sprag bodies are simply struck from the bar.
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