The optimisation of the design of a DIN 6885-1 keyway

This data considers the effect of key and keyway design on the stresses in a keyed shaft loaded in torsion, bending or under combined torsion and bending. Common types of keys, such as the Woodruff key and the square key are discussed and stress concentration data is given for a range of keyway geometries for both the sled-runner and the end-milled type keyways. A method to optimise keyway design is presented to reduce stress concentrations in the keyway in a shaft. A worked example illustrates the use of the data in this Item. ESDU 15004 is closely related to ESDU 86028 which presents data on the fatigue strength of a shaft with the keyway in bending, and a shaft loaded through the key in torsion.

The optimisation of the design of a DIN 6885-1 keyway is presented as a possible method to reduce stress concentrations in the keyway. By increasing the keyway depth it is found that there is almost a 44 percent reduction in the maximum stress of the optimised keyway design but it must be noted that the key design should also be changed to adapt to this new keyway design.

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