A spline is a mechanical component with ridges or teeth on a shaft that mesh with grooves in a mating piece to transmit torque while allowing axial movement.
A spline is a precision-engineered mechanical element featuring a series of parallel ridges (teeth) machined along the length of a shaft or bore. These teeth engage with corresponding grooves in a mating hub or sleeve to create a positive, non-slip connection for transmitting rotational torque. Unlike keyways, splines provide a multi-tooth contact surface, distributing the load more evenly, which allows for higher torque capacity, reduced stress concentration, and the ability to accommodate axial movement (sliding) between the connected parts. They are critical in applications requiring precise angular alignment and reliable power transfer under dynamic conditions.
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A keyway uses a single key in a slot to transmit torque, creating high stress concentration. A spline uses multiple teeth around the circumference, distributing load evenly, allowing higher torque capacity, better alignment, and often permitting axial sliding movement.
The three primary types are: 1) Involute Splines: Most common, with curved tooth profiles for smooth engagement and high strength. 2) Straight-sided Splines: Simpler profile, easier to manufacture. 3) Serrated Splines: Triangular teeth, often used for lighter loads or indexing.
Fit class (e.g., Class 4, 5, 6 per ISO/DIN standards) defines the tolerance between mating teeth. It is selected based on application requirements: closer fits (Class 4) for precise alignment and minimal backlash; looser fits (Class 6) for easier assembly and accommodation of axial movement.
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