Patent ID: 7278332
Filing Date: 2007-10-09
Classification: F16C,F16H,Y10T

Abstract:
1. A linear motion device comprising: a linear motion body externally fitted onto a shaft and making a relative linear motion along the shaft; a plurality of balls retained in a rolling element groove formed in an inner surface of the linear motion body, and rolling between the rolling element groove and the shaft; a circulating path formed in the linear motion body and for circulating the balls from one end side of the rolling element groove to the other end side thereof; and separators interposed among the balls; wherein each of the separators has contact surfaces each contacting with the ball and having a concave surface like an offset Gothic arch, a ratio f each of the separator has concave surfaces each contacting with the ball, the concave surface being a conical surface shape with an apex angle α of 64° to 140°, and a ratio θ=d/D wherein the linear motion device is charged with grease containing base oil and thickener, the base oil being 50-500 mm