Patent ID: 7845875

Claim:
A light articulation ball-joint ( 1 ), comprising: a metal inner ring ( 3 ) and a metal outer ring ( 7 ), provided respectively with a spherical outer surface ( 3 B) and a spherical inner surface ( 7 B), the ball-joint further comprising a first contact layer ( 4 ) applied to the spherical surface of one of the rings and a second contact layer ( 8 ) applied to the spherical surface of the other ring, wherein the first contact layer ( 4 ) has a hardness which is less than the hardness of the second contact layer ( 8 ) and a thickness which is greater than the thickness of the second contact layer ( 8 ), the first contact layer ( 4 ) being adapted to release particles ( 42 ) of solid lubricant by friction with the second contact layer ( 8 ).