Patent ID: 8794095
Filing Date: 2014-08-05
Classification: F16H,F16N,Y10T

Abstract:
1. A rotolinear actuator of the type comprising: a central rod having a threaded outer face, an outer ring surrounding substantially coaxially said central rod and possessing a threaded inner face, and a plurality of threaded satellite rollers distributed circumferentially between said outer face of said central rod and said inner face of said outer ring and engaged with said threaded faces of said central rod and said outer ring, one of said central rod and said outer ring being capable of rotating and axially secured while the other, respectively said outer ring or said central rod is secured in rotation and capable of being axially displaced, wherein the actuator comprises at least one auxiliary roller in contact with at least one satellite roller for distribution by capillarity of a lubricant liquid at least one contact area of said at least one satellite roller with said central rod and said outer ring, said at least one auxiliary roller having a diameter lower than the diameter of said satellite rollers, said lubricant being distributed by capillarity from a store; said auxiliary roller being neither in contact with said central rod nor with said outer ring wherein at least one of said satellite rollers and at least one auxiliary roller arranged in contact with at least one satellite roller is constituted of a porous material comprising a capillary reservoir formed by pores of said porous material.