| 摘要 |
It comprises a bolt and a surrounding sleeve both being arranged transversely to the wings of the yokes between which a driving shaft is provided. The stem of the bolt is housed into respective holes of the wings in the yokes and it has at least a first, threaded end portion and a second, not threaded adjacent portion which diameter is slightly larger than the inner diameter of the sleeve. In an assembled position, the sleeve exerts a pressure on the driving shaft surface preventing its axial movement as it is expanded and forcing it against the yoke bottom. The stem of the bolt may have a third portion adjacent to the head acting as a support for the bolt in the wing of the yoke. A greater effectiveness in the axial clamping of the driving shaft is achieved with a simple and quick assembly, and with a reduced cost.
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