| 摘要 |
PURPOSE:To prevent a shell from causing displacement in a process of press- molding by forming, through a process of underfilling, a semi-sphere portion on the end side of the head portion of a shaft center axis in a sphere of a larger radius of curvature so as to erase the deformation resistance taking place on a rubber layer at the time of press-molding a shell. CONSTITUTION:The shape of a head portion 4 is formed by underfilling in a sphere in which the radius of curvature R1 of the end side semi-sphere 16 is larger than that of a semi-sphere 15 on the opposite side. A ball stud 2 is formed by setting the head portion 4 of a shaft center axis inside a shell 6 and injecting a rubber 5 into a space between the mutually opposing shell 6 and the head portion 4. Then the shell 6 is press molded in a spherical shape with its both ends 8 and 9 with a cup die. Accordingly both ends of the rubber layer 5 are strongly compressed and the deformation resistance is erased. Therefore, there will be no displacement of the shell as sufficient compressive stress is given to the rubber layer 5 to prevent separation of the rubber layer while the ball joint is in use.
|
