Gear chain transmission error analysis: gear chain drive error is integrated various gear transmission error. Due to transmission errors are random errors, so the integrated transmission error, the first to introduce the basic integrated type transmission error, and then apply the theory of probability and statistics derived transmission error of statistical calculation formula.

The main factors affecting the gear transmission errors are: the angular movement of each gear itself error, with the gap gear bore and shaft, eccentric shaft and the bearing inner ring eccentricity. Angular movement itself available gear gear transmission error analysis software developed to measure, it is consistent with a normal distribution. Since F exhibits a periodic distribution, so it could be envisaged by the equivalent of a follower change △ e eccentricity caused its peak F. The equivalent eccentric Rayleigh distribution, phase angle, in line with a uniform distribution on a turn. We can deduce the entire transmission chain transmission error statistics distribution formula based on the error value.

Taking into account the practical calculation methods and specifications, the Ministry of standard SJ2557 a basic selection of 84 recommended methods for calculation. Although this standard only for small modulus gear, but this method is still applicable to large modulus gear precision calculations. So, for simplicity sake of consistency, both still use this approach.