Tripod type constant-velocity joint

A tripod type constant-velocity joint through which a driving shaft is coupled to a driven shaft such that rotation of the driving shaft is transmitted to the driven shaft through the joint, wherein the joint is configured to reduce fluctuations in rotational speed of the driven shaft when an axis of the driving shaft and an axis of the driven shaft form an angle other than 180 degrees, or when the axis of the driving shaft and the axis of the driven shaft are out of alignment with each other,

• wherein the joint comprises two outer rings connected to the driving shaft and the driven shaft, respectively, and a tripod member through which the outer rings are coupled together, wherein each of the outer rings has an inner periphery formed with three axially extending track grooves arranged at angular intervals of 120 degrees, and wherein the tripod member has two axial ends each formed with three protrusions axially slidably received in the respective track grooves of a corresponding one of the outer rings, whereby torque around an axis is transmitted between the respective outer rings and the tripod member.