| 摘要 |
<p>PURPOSE:To prevent concentration of stress at a connected part by connecting a soft resin part and a hard resin part so as to change longitudinal bending rigidity, and lapping the soft resin part and the hard resin part to form the connected part in such a way that the wall thickness of the hard resin layer is gradually increased as the wall thickness of the soft resin layer is gradually decreased. CONSTITUTION:The outer skin forming a through hole 14 inside is formed of a soft resin made part 11 and a hard resin made part 13. A connected part between the soft resin part 11 and the hard resin part 13 is of lap-jointed two- layer structure, where the wall thickness of the hard resin layer is gradually increased as the wall thickness of the soft resin layer is gradually decreased. The soft resin is made of polyurethane elastomer, polystyrene elastomer, or the like. The hard resin is made of a thermotropic liquid crystal polymer, polyamid, or the like. As a result, concentration of stress at the connected part can be prevented, thereby transmitting torque smoothly.</p> |
