Patent ID: 6652413
Filing Date: 2003-11-25
Classification: F16H,Y10S,Y10T

Abstract:
A traction drive rotary assembly for transmitting power via traction oil, the traction drive rotary assembly comprising:a plurality of rolling elements including traction contact surfaces associating with each other to transmit the power between the rolling elements, at least one of the traction contact surfaces having a surface microstructure including grooves and protrusions alternately arranged, the surface microstructure being represented by an unfiltered primary profile curve that includes recesses and projections corresponding to the grooves and the protrusions, respectively, each projection including a portion located higher than a center line of the unfiltered primary profile curve, the portion having a shape selected from a generally trapezoidal shape with rounded corners, a generally crowning shape, a generally elliptic arc shape, a generally sinusoidal shape and a generally triangular shape with a rounded apex, wherein a ratio &lgr;/AMP of a wavelength &lgr; of the unfiltered primary profile curve to a half depth AMP of each recess is in a range of 50-400.