Static and Dynamic Transmissin Error in Spur Gears

Abstract

Abstract:In high precision and heavily loaded spur gears the effect of gear errors is negligible, so the periodic variation of tooth stiffness is the principal cause of noise and vibration. High contact ratio spur gears could be used to exclude or reduce the variation of tooth stiffness. The analysis of static and dynamic transmission error of spur gears cut with standard tools of 20° profile angle is presented in this paper. A simple method to design spur gears with a contact ratio nearly 2.0 is used. It consists of increasing the number of teeth on mating gears and simultaneously introducing negative profile shift in order to provide the same center distance. Computer programs to calculate static and dynamic transmission error of gears under load have been developed. The analysis of gears using these programs showed that gears with high contact ratio have much less static and dynamic transmission error than standard gears.

A comparative analysis on two gear tooth materials for low speed and high torque transmission

“…The method is capable of ranking materials from the best to the worst while estimating their incomparability's and indifferences. Podzharov et al [5] proposed the use of high (nearly 2) contact ratio spur gears to reduce the tooth stiffness variation by increasing the number of teeth on mating gears using computer programs for the calculation of static and dynamic transmission error. According to their findings, gears with high contact ratio have less static and dynamic transmission error than standard gears.…”

Experimental and numerical study of tooth finishing processes contribution to gear noise

“…Most developed models calculate the gear transmission error, defined by Harris [15] and Welbourn [16] as the deviation between the theoretical angular position of the driven gear and its actual position. It has been shown to be the main cause of gear noise [17][18][19]. However, the multi-step manufacturing process can introduce micro-geometry deviations on the flanks which can alter the meshing contact and influence gear noise [20].…”