Patent ID: 9618055
Date: 2017-04-11
CPC Classifications: F16C,F16D,Y10S

Claim:
1. A constant-velocity joint for transmitting rotary drive power, comprising: an outer member having a plurality of guide grooves defined in a side wall surface thereof, the guide grooves being spaced at prescribed intervals from each other and extending in an axial direction of the outer member; an inner member inserted into the outer member, the inner member having an annular member and a plurality of holders, which project respectively from the annular member into the guide grooves; and a plurality of roller assemblies, wherein one of the plurality of roller assemblies is rotatably mounted on each holder, each of the roller assemblies including an inner roller, and an outer roller, which is disposed outwardly of and mounted on the inner roller through interposed rolling members, wherein each of the holders has a plurality of contact regions held in abutment against an inner circumferential wall surface of the inner roller, and a plurality of non-contact regions spaced from the inner circumferential wall surface of the inner roller, the contact regions and the non-contact regions being arranged alternately, wherein the contact regions at least include parallel regions where hypothetical tangential lines thereto extend parallel to longitudinal directions of the guide grooves, and perpendicular regions where hypothetical tangential lines thereto extend perpendicularly with respect to the longitudinal directions of the guide grooves, wherein the inner roller and the outer roller are configured to rotate integrally and simultaneously, and wherein the parallel regions include side wall surfaces, which are of a straight shape when viewed in a cross-sectional plane taken along a line that passes through the parallel regions and a diametrical center of each of the holders.