Spline or keyway is a mechanical component used to transmit torque between rotating shafts and gears in industrial machinery.
A spline or keyway is a precision-engineered mechanical feature on shafts and gears that provides a positive drive connection for torque transmission. Splines consist of multiple parallel ridges (teeth) that mesh with corresponding grooves, while keyways are single slots that accommodate rectangular keys. Both prevent relative rotation between connected components while allowing axial movement in some designs. In input shafts and pinions, these features ensure precise alignment and power transfer in gearboxes, transmissions, and drive systems.
诱因 → 失效模式 → 工程缓解
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Splines have multiple teeth that distribute load across several contact points, allowing for axial movement and higher torque capacity. Keyways use a single rectangular key in a slot, providing simpler installation but lower torque capacity and no axial movement capability.
Choose splines for high-torque applications, need for axial movement, or precise angular positioning. Select keyways for lower-cost applications, simple assembly/disassembly, or when axial movement is not required. Consider torque requirements, space constraints, and manufacturing capabilities.
Common failures include wear from insufficient lubrication, fatigue cracking from cyclic loading, shear failure from overload, and fretting corrosion from micro-movement. Proper material selection, heat treatment, and maintenance prevent these issues.
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