| 摘要 |
A homokinetic universal joint having an outer ring formed in its inner periphery with three axially extending cylindrical track grooves and a tripod member mounted in the outer ring and having three trunnions extending radially so as to be inserted in the track grooves. A guide roller is mounted on each trunnion through needle rollers so as to be engaged in each track groove. Each needle roller or each guide roller is formed with minute recesses arranged at random so that the RMS(L)/RMS(C) ratio will be not more than 1.0 wherein RMS(L) and RMS(C) are surface roughness values in the longitudinal and circumferential directions, respectively. An SK value, another surface roughness parameter, is set to be not more than -1.5. Each minute recess should have an area ratio of the minute recesses to the entire surface being 10-40% and an average area of 35-150 square microns.
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