Ball screw-nut machine with a lubricant supply member
AssigneeNsk Ltd.
InventorToru Tsukada
Life of this patent
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Abstract
A ball screw-nut machine is disclosed in which a number of ball rolling elements are interposed between the spiral thread of a ball screw shaft and a ball nut, wherein the opposed threads of the shaft and nut define a load element rolling space. The balls circulate endlessly in plural endless circulation paths which are each formed by the combination of the load element rolling space and a ball circulating path. A lubricant supply member is disposed between the endless circulation paths so as to supply the balls and threads with lubricant. The lubricant supply member is formed of a lubricant-containing polymer. As a result, stable lubrication of the machine is ensured for a long time.
Claims10
A ball screw-nut machine comprising:
- a screw shaft comprising a first spiral thread on an outer surface thereof;
- a ball screw-nut screwed to said screw shaft comprising on an inner surface thereof a second spiral thread opposed to said first spiral thread of said screw shaft, said ball screw-nut having ball circulating paths;
- a spiral load element rolling space defined by said first spiral thread and said second spiral thread;
- a number of balls circulated endlessly within endless ball circulating paths which are formed by the spiral load element rolling space and the ball circulating paths;
- a spiral block space defined in the spiral load element rolling space between the ball circulating paths;
- and
- a lubricant supply member substantially filling said spiral block space.
Dependencies are inferred from the claim text.