Especially used for ball joints of automobile pendulum pillars, it has a shell with at least one end open, a bearing shell is installed in the inner cavity of the shell, and the bearing shell itself slidably supports the articulated ball joint of a spherical shaft head. .
In this type of ball joint, the inner cavity has convex and concave or polygonal cross-sections along its inner shell surface, so that the bearing shell with interference relative to the inner shell surface can be installed under the condition of local plastic deformation of the outer surface. Inside the shell. The inner shell surface has a pressing area that shortens the effective length of the protrusions or depressions.