Abstract: According to the engage relation of cycloidal gear with the pin wheel in type 2K-V transmission, the formulas of relationship between transmission precision and mesh error of the actual profile of gears are established; then a synthesis mesh error is proposed as a quantified concourse of error to judge the transmission error, therefore the machining tolerances relative to basis for machining high precision 2K-V drives with cycloidal gears. With the calculation and experiment test records of typical example, the correctness of the relationship and calculation is confirmed.

Key words: Cycloidal pin gear, Mesh error, Transmission precision, Type 2K-V