The dynamic factor has been included in gear design and ratingformulas since the 1930’s. Its original formulation was based on anassessment of entering tooth impacts, but in modern gear designprocedures, where tip relief and lead modifications are common,these impacts may be virtually eliminated. With this elimination,one finds that gear dynamics are mainly excited by steady statephenomenasuch as transmission error, friction and axial shuttlingof the mesh force. This paper first provides a historicalprogression of the dynamic factor equations that are based onimpact theory and then discusses when this methodology isappropriate. A sophisticated dynamic finite element simulation of agear pair with significant spacing errors is used to describe theentering impacts of a spur gear pair. A new steady state dynamicmodeling approach is used to demonstrate the effects of thedifferent excitations as well as manufacturing deviations on thepredicted dynamic loads.
- Edition:
- 07
- Published:
- 10/01/2007
- Number of Pages:
- 13
- File Size:
- 1 file , 610 KB
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