Estimation of transmission error of cylindrical involute gears by tooth contact pattern.

Abstract

The correlation between transmission error of gears and some factors which are usually considered to express characteristics of tooth contactt pattern, such as areal percentage and total length of simultaneous contact lines, is examined, but very poor correlation is found. A new method of estimating the transmission error from a tooth contact pattern is introduced. This is a method of supposing a triangular shape for composite error on actual contact line which results in the ridge figure of the composite error surface as a function of tooth contact pattern. The transmission error is derived as a function of this ridge figure. The results estimated by this method showed fairly good correlation with the actual transmission error, especially for low transmitting load. Based on this method, an index value for the magnitude of transmission error is also introduced.