Patent ID: 6955468
Filing Date: 2005-10-18
Classification: F16C,F16H,Y10T

Abstract:
1. A linear-motion device comprising: a linear-motion element fitted on a shaft which moves straight along the shaft; a plurality of balls which are retained in a ball groove formed on the inner side of the linear-motion element and roll over between the ball groove and the shaft; a separator interposed between the balls; and, a circulating path formed in the linear-motion element through which the balls are circulated from one end of the ball groove to the other, which is filled with a grease, wherein the separator is a formed product comprising as a resin component a polybutylene naphthalate-based elastomer formed by a hard segment made of a polybutylene naphthalate and a soft segment made of a polycondensation of 2,6-naphthalenedicarboxylic acid with a polytetramethylene ether glycol.