| 摘要 |
Linear motion device including bearings and valves in which all elements are in rolling contact only, there being no sliding friction. A pair of major rollers is prevented from moving apart by one or more retaining rings, belts or springs, or; two groups of major rings have a retainer roller inserted through them and in rolling contact with their inner peripheries to prevent them from moving apart. One or two separating rollers are interposed between the major rollers or major rings to prevent them from moving towards each other, the separating rollers being held in position by gravity, retaining rings, or a rigid stationary element. A rod or bar may be inserted between two or more rotating elements so as to move in parallel rolling contact with respect to another bar, stationary base, or housing to provide a linear bearing. One embodiment of the device is operable within a close-fitting housing to serve as a linear fluid actuated valve.
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