| 摘要 |
PURPOSE:To prevent vibration by the tertiary force of rotation at an axis by installing a bearing to enable a roller's free movement, in the peripheral direction of a spider's leg, and a bearing to enable a roller's free movement in the axial direction of the spider's leg. CONSTITUTION:A spider 2 is formed in the shape of a tripod, with its each leg 6 fixed with a roller 3. Two bearing spaces 11, 12 are formed between the roller 3 and the leg 6 with a spacer 10 in-between. And the inside bearing space 11 is shaped spherical in its cross section with needle bearings 8 arranged in the peripheral direction, and the outside bearing space 12 is shaped polygonal in its cross section, with needle bearings 9 arranged in the axial direction of the leg 6. |
