| 摘要 |
A spline shaft assembly includes a rotatable shaft extending along an axial direction and having an outer surface, and a plurality of first grooves formed in the outer surface. A transmission module is formed with a through hole and has an inner surface defining the through hole, and a plurality of axially extending second grooves formed in the inner surface. Each of the first and second grooves is defined by a semi-circular groove-defining wall. The rotatable shaft extends through the through hole. A spline key set has a plurality of cylindrical keys extending along the axial direction and disposed between and engaging the first grooves and the second grooves, and at least two positioning members connected to the transmission module and associated with the cylindrical keys such that the transmission module and the cylindrical keys are co-rotatable.
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