STATIONARY CONSTANT-VELOCITY UNIVERSAL JOINT

摘要

Provided is a stationary constant-velocity universal joint which can prevent stick slip from occurring due to lack of lubricant even during use in an extremely cold region, and prevent abnormal noises from occurring when it is cold. The stationary constant-velocity universal joint has grease enclosed therein and is provided with an external joint member (23) having an inner diameter surface in which a plurality of track grooves (22) are formed, an internal joint member (26) having an outer peripheral surface in which a plurality of track grooves (25) are formed, a plurality of balls (27) for transmitting torque provided between the track grooves (22) of the external joint member (23) and the track grooves (25) of the internal joint member (26), and a cage (28) for retaining the balls (27). The grease contains 80 wt% or more of paraffinic mineral oil or a mixture of paraffinic mineral oil and synthetic hydrocarbon oil with respect to the total weight of a lubricant component contained as the base oil. The paraffinic mineral oil accounts for 70 wt% or more of the total weight of the lubricant component, and a thickener accounts for 3-8 wt% of total weight of the components of the grease, so that the grease prevents abnormal noise from occurring when it is cold.