| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that, when the flatness of a flange is unsatisfactory, an upper lace and the flange are slid, a loss is increased, and efficiency becomes worse.SOLUTION: A push-pressing part 169 is arranged at a flange 123 of a shaft 120, a pressure receiving part 172 is arranged at an upper lace 154, an outside diameter of the push-pressing part 169 is made not smaller than a revolution trace diameter of a ball 153, an inside diameter of the push-pressing part 169 is made smaller than the revolution trace diameter of the ball 153, and thereby friction torque imparted between the upper lace 154 and the flange 123 is raised. By this, a slide is prevented and efficiency can be improved. |
