LUBRICANT COMPOSITION FOR BALL JOINT

摘要

PROBLEM TO BE SOLVED: To obtain a lubricant composition having low operation torque and capable of suppressing change in torque after being repeatedly operated and changed amount of ball stud to the utmost in a ball joint frequently used for a link part of suspension system and a link part (e.g. tie rod end part) of steering gear of automobile, or the like. SOLUTION: This lubricant composition for ball joint comprises (A) 100 pts.wt. at least one kind of viscous material selected from the group consisting of (i) polyisoprene rubber and (ii) a polyisoprene rubber viscous material and having 3×103 to 105 cP viscosity at 25 deg.C and (B) 15-45 pts.wt. at least one kind of amide compound selected from the group consisting of an aliphatic amide represented by the formula R1CONH2 and an aliphatic bisamide represented by the formula R1CONHR2NHCOR and (C) 5-30 pts.wt. at least one kind of wax selected from the group consisting of polyethylene wax, paraffin wax and microcrystalline wax.