| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball joint to be excellent in rotation of a ball stud and also in durability. SOLUTION: A ball joint 10 comprises a rigid sheet 1, a ball stud 2, a socket 3, a soft sheet 4, and a spring 5. The rigid sheet 1 is provided with a spherical part 11 facing on a ball head part 21, and a cylindrical cylinder part 12. Further, the spherical part 11 is provided on an inside surface with a plurality of radial protrusion parts 111 formed in the shape of a protrusion. A radial protrusion part 111 is provided with a central linear part 112 making approximately linear contact with the ball head part 21. Wedge-form gaps 113 to penetrate grease are formed between the radial protrusion part 111 and the ball head part 21. Further, a groove 114 for grease is formed between the radial protrusion parts 111.
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