Spur Gear Design Streamlined
Journal Title: Machine Design - Year 2017, Vol 9, Issue 1
Abstract
A design approach is presented that synthesizes spur gear design theory and practice into a coherent and systematic method. Simplification is achieved through reformulation of stress capacity models which is based on the transmitted torque instead of the transmitted force because the transmitted torque can be evaluated from the transmitted power and the rotational speed of the input or output shaft, often known at the beginning of a design problem. The transmitted force depends on gear sizes which are often unknown at the onset of design. Spur gear design is separated into design sizing and design verification tasks and for gear design comparisons, metrics called space factor and mass factor are formulated. Three design examples are considered, one example in three categories of surface hardness. Normalized gears are selected for Example 1, quenched-tempered gears for Example 2, and carburized case-hardened gears for Example 3. When the quenched-tempered gearset of Example 2 is replaced with carburized gearset in Example 3, a 44% reduction in both space factor and mass factor is predicted. Estimates of load factors for design sizing and verification are compared for the design examples considered. The highest variance for mesh overload factor is -1.00%, for internal overload factor is -6.677% and for the service load factor is -6.632% in the design examples. Due to these very small variances, the models used for estimating these parameters in design sizing are deemed acceptable. The estimated service load factor in design verification for Example 1 is 2.825, that for Example 2 is 2.322, and that for Example 3 is 2.207. These values suggest that the gear teeth in Example 1 could experience almost three times the rated load while those in Examples 2 and 3 could experience almost 2.5 times the rated load on a recurrent basis in operation.
Authors and Affiliations
Edward OSAKUE, Lucky ANETOR
Keywords
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- EP ID EP317781
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