Mounting holes and keyways are precision-engineered features on drive sprockets that ensure secure attachment to shafts and prevent rotational slippage.
Mounting holes are precisely drilled or bored openings in a drive sprocket's hub that align with corresponding holes on a shaft or adapter, allowing for secure fastening with bolts or screws. Keyways are longitudinal slots machined into the sprocket's bore that accommodate a mechanical key, which fits into a matching keyway on the shaft to transmit torque and prevent relative rotation. Together, these features provide both axial fixation and torsional locking, ensuring reliable power transmission in chain drive systems.
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A keyway uses a single rectangular key for torque transmission and is simpler/cheaper, suitable for moderate loads. Splines have multiple longitudinal teeth around the bore, providing higher torque capacity, better concentricity, and ease of assembly/disassembly, but are more complex and costly.
Keyway size is determined by shaft diameter and torque requirements. Refer to standards like ISO 773 or DIN 6885, which specify keyway dimensions based on shaft diameter. Calculate shear stress on the key using transmitted torque and key material strength to ensure safety.
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