| 摘要 |
PURPOSE:To prevent the play of a helicoid screw, by constituting a helicoid member so that the elasticity in the radial direction and the thrust direction is given to helicoid screws provided on a helicoid cylinder part. CONSTITUTION:Three-divided discontinuous helicoid screws 12 are provided on the outside circumference of a helicoid cylinder part 11, and clearance parts 12 are provided in respective open end parts 12a of screws 12 to give the elasticity in the radial direction to each screw thread 13. Slots 15 are provided between respective screw threads 13 to give the elasticity in the thrust direction. By this constitution, when a member which is enagaged with helicoid screws 12, for example, a member named a central helicoid bites helicoid screws 12 and slides, screw threads of the central helicoid interfere in elastic parts 16 of helicoid screws 12 to cause an elastic deformation in the radial direction and the thrust direction. Consequently, elastic parts 16 continue pressing mutually, and thus the play of helicoid screws is prevented. |
