Patent ID: 6402623
Filing Date: 2002-06-11
Classification: F16D,Y10S

Abstract:
A constant velocity joint comprising:an inner race; inner engagement grooves each taking a circular arc in section and formed in eight locations at an equal interval in a circumferential direction on an outer peripheral surface of said inner race in a direction right-angled to the circumferential direction; an outer race provided along a periphery of said inner race; outer engagement grooves each taking a circular arc in section and formed in positions facing to said inner engagement grooves on an inner peripheral surface of said outer race in the direction right-angled to the circumferential direction; a cage sandwiched in between an outer peripheral surface of said inner race and an inner peripheral surface of said outer race and formed with eight pockets separated by column members, each pocket being elongated in a circumferential direction in positions aligned with said inner engagement groove and said outer engagement groove; and eight balls adapted to roll along said inner engagement grooves and said outer engagement grooves while being held inwardly in each of the pockets, wherein an axial crossing angle between a central axis of said inner race and a central axis of said outer race is bisected, said balls are disposed within a bisection plane orthogonal to a plane including these two central axes, and when rt=tc/Da: (0.054/rt)Da&lE;w&lE;(0.16/rt)Da is satisfied, where Da is the major diameter of each of said balls, w is the circumference-directional width of each of the column members existing between the pockets adjacent to each other in the circumferential direction with respect to said cage, and tc is the diameter-directional thickness of each of the column members of said cage.