Patent ID: 8629091

Claim:
A universal joint with a lubrication system comprising a foamed lubricant containing a lubricating component in a resin thereof which foams, hardens, and becomes porous; and a grease for auxiliary lubrication which is present together with said foamed lubricant in a portion to be lubricated, wherein a rotational torque is transmitted owing to engagement between track grooves provided on an outer member and an inner member and torque transmission member; said torque transmission member being adapted to roll along said track grooves to move in an axial direction; and said grease for auxiliary lubrication and said foamed lubricant are present together inside said universal joint; wherein said universal joint has a boot, said boot being a part that is separate from said foamed lubricant and wherein said grease for auxiliary lubrication satisfies a condition that (1) a penetration thereof is not less than 175 and less than 285 or that (2) a mixing ratio of a thickener to said grease for auxiliary lubrication is not less than 10 wt % and less than 40 wt %.