Patent ID: 7121950

Claim:
A tripod type constant velocity universal joint comprising: an outer joint member having track grooves extending axially and distributed at circumferentially trisectional positions on an inner circumferential surface of the outer joint member; an inner joint member having trunnion journals projecting radially and distributed at three equally spaced circumferential positions on an outer circumferential surface of the inner joint member; and roller mechanisms attached to the trunnion journals, respectively, each of the roller mechanism having a roller capable of being shaken with respect to a corresponding one of the trunnion journals and axially rolling on a corresponding one of the track grooves, each of the track grooves having roller guiding surfaces for guiding an outer circumferential surface of the roller of the corresponding roller mechanism on both circumferential sides, wherein a track gap δ 1 (mm), formed between the outer circumferential surface of the roller and the corresponding roller guiding surface while a torque is applied, is set to satisfy δ 1 >0.03/A where the value A=r/R, and r represents a radius of curvature of a generatrix of the outer circumferential surface of the roller and R represents a radius of an outer circumference of the roller.