Patent ID: 8454448

Claim:
A sliding type tripod constant velocity joint comprising: an outer ring of a tubular form having three raceway grooves which are formed on an inner peripheral surface and which extend in a direction of a rotation axis of the outer ring; a tripod including a boss part connected to a shaft and three tripod shaft parts which are provided upright so as to extend outward in a radial direction of the boss part from an outer peripheral surface of the boss part and which are inserted into the raceway grooves, respectively; a pair of intermediate members which are arranged so as to sandwich a corresponding one of the tripod shaft parts from both sides of side surfaces of the raceway grooves and which are provided so as to be oscillated relative to the corresponding one of the tripod shaft parts; a plurality of rolling elements provided between the side surfaces of a corresponding one of the raceway grooves and power transmission surfaces of the pair of intermediate members opposing the side surfaces to the corresponding one of the raceway grooves so as to roll along the side surfaces of the corresponding one of the raceway grooves; and a cage that supports the rolling elements such that the rolling elements circulate on outer peripheries of the pair of intermediate members, wherein an outer peripheral surface of each of the tripod shaft parts has a spherically protruding shape, wherein under a state where a rotation axis of the outer ring coincides with a rotation axis of the shaft, a tripod pitch circle radius (PCR) is set to be larger than an outer ring PCR, where the outer ring PCR is a distance between: a point on a tripod axis intersecting a plane which passes through a center of width of the rolling element along the tripod axis and which is orthogonal to the tripod axis; and the rotation axis of the outer ring, and where the tripod PCR is a distance between: a center of curvature of the outer peripheral surfaces of the tripod shaft parts; and the rotation axis of the shaft, and wherein the cage regulates a relative operation of the intermediate members in an axial direction of the outer ring.