Socket assembly
The socket assembly includes a housing that presents an inner wall which surrounds an open bore. A stud is partially received in the open bore with a bearing interposed between the inner wall and the stud. The bearing has a bearing piece, which is in surface-to-surface contact with the stud, and a preload piece which is elastically compressed to impart a biasing force on the bearing piece, thereby preloading the bearing piece against the stud. The preload piece is in an overmolded engagement with the bearing piece to securely couple these pieces together such that the bearing can be inserted into the open bore of the housing together as a unit. The bearing and preload pieces are made of different materials with different elasticities.
1. A socket assembly, comprising:
a housing with an inner wall which surrounds an open bore that extends along a central axis;
a stud including a shank portion and a ball portion, said ball portion having an upper hemisphere and a lower hemisphere formed as a single piece, and said ball portion being received in said open bore of the housing and projecting out of said open bore through an open end in said housing;
a bearing disposed in said inner bore of said housing and interposed between said inner wall and said stud;
said bearing having a bearing piece which is in surface-to-surface contact with said stud and a preload piece which is elastically compressed to impart a biasing force on said bearing piece and to preload said bearing piece against said ball portion of said stud;
said preload piece being in overmolded engagement with said bearing piece to securely couple said preload and bearing pieces together;
said bearing piece being made of a first material that has a first modulus of elasticity and said preload piece being made of a second material that has a second modulus of elasticity which is lower than said first modulus of elasticity; and
wherein said bearing piece and said preload piece of said bearing are fused together such that a bonding area which joins said bearing and preload pieces contains both said first material and said second material mixed together.
2. The socket assembly as set forth in claim 1 wherein said bearing piece presents a plurality of protrusions that are spaced from one another to improve the overmolding engagement between said bearing piece and said preload piece of said bearing.
3. The socket assembly as set forth in claim 2 wherein said housing is deformed to compress said preload piece of said bearing.
4. The socket assembly as set forth in claim 3 wherein said preload piece is compressed between said bearing piece and a wall at a closed end of said housing.
5. The socket assembly as set forth in claim 2 wherein said bearing piece has a bearing surface which is semi-spherically curved and is in surface-to-surface contact with a semi-spherically curved outer surface of said ball portion.
6. The socket assembly as set forth in claim 1 wherein said first material is a glass-reinforced polyoxymethylene and said second material is an unreinforced polyoxymethylene.