A spline shaft is a precision mechanical component with longitudinal grooves that transmits torque while allowing axial movement in steering systems.
A spline shaft is a cylindrical mechanical component featuring a series of longitudinal ridges (splines) that mesh with corresponding grooves in a mating part, such as a Pitman arm or rack assembly. In automotive steering systems, it transmits rotational torque from the steering gear to the steering linkage while permitting controlled axial movement to accommodate suspension travel and steering adjustments. The spline geometry ensures precise angular alignment and torque transmission without slippage.
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Involute splines have curved tooth profiles that provide better load distribution and self-centering, while straight-sided splines are simpler to manufacture but may have higher stress concentrations.
The spline design allows the mating component to slide along the shaft's length while maintaining rotational engagement, which is essential for adjusting steering linkage or absorbing suspension movements.
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