| 摘要 |
A ball-type universal joint provides three concentric, relatively movable spherical elements that resists both compressive and extensive forces. An outer shell carries a first shaft and defines a medial chamber comprising more than half a hemisphere with a releasably fastenable outer portion to allow access. A medial shell carried in the outer shell chamber defines a spherical chamber comprising more than half a hemisphere with a releasably fastenable outer portion to allow access. An inner spherical ball carries a second shaft and is carried within the chamber defined in the medial shell. A plurality of ball bearings carried in indentations in the outer surface of the medial shell communicate with elongate slots defined in the interior surface of the outer shell to allow angulated motion of the outer and medial shells but prevent rotary motion. A plurality of ball bearings carried in indentations defined in the inner ball communicate with slots defined in the inner surface of the medial shell to allow angulated motion of the inner ball and medial shell but prevent rotary motion. A protective boot encloses the joint between the first and second shafts and lubrication passages are provided for the relatively moving surfaces.
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