| 摘要 |
A bore welding mechanism comprising a casing having spindle bushings rotationally and axially supporting a rotatable and axially translatable spindle for supporting a bore repair mechanism in alignment with a bore. The spindle has an axially extending keyway and a worm gear thread extending for at least a part of a length of the spindle. A spindle drive gear is coupled to the spindle by a drive key engaging with the keyway of the spindle so that the spindle is rotationally fixed to the spindle drive gear and axially translatable with respect to the spindle drive gear. A drive shaft extends through the casing, transversely to and offset from an axis of the spindle, and includes a drive shaft worm gear rotationally fixed to the drive shaft. The worm gear engages with the spindle drive gear to rotate the spindle drive gear and the spindle due to rotation of the drive shaft. |
