Patent ID: 6478683
Filing Date: 2002-11-12
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 a plurality of locations in a circumferential direction on an outer peripheral surface of said inner race in a direction right-angled to a 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 a plurality of pockets each elongated in a circumferential direction in positions aligned with said inner engagement grooves and said outer engagement grooves; and a plurality of balls made capable of rolling along said inner engagement grooves and said outer engagement grooves in a state of being held inwardly of the pockets, the number of said balls being the same as the number of said inner and outer engagement grooves, 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, where tc is an average thickness of the cage which is expressed by Â½ of a difference between a diameter Dc of the outer peripheral surface of said cage and a diameter dc of the inner peripheral surface of said cage, 0.16t<0.30 is satisfied.