Abstract: Tooth profile error can be a cause of significant vibration and noise in gear systems and already command much designer attention, especially in high speed gearing applications. The gearing noise effected from different forms of tooth profile is studied, such as involutes, convex, concavity, negative and positive pressure angle tooth curves. As a result, the negative pressure angle ones produce largest noise when they work as driving gear; The positive pressure angle ones bring smaller noise than negative ones; The concavity tooth profile ones produce larger noise; The involutes and convex tooth profile ones produce lower noise. The different effects of the five kinds of tooth profile on gear mesh noise are compared, which suggests that on the premise of overlap coefficient and trans-mission precision of the gear, the measure of repairing fate on the top edge of the teeth can be taken.

Key words: Gear noise, Gear profile error, Gear transmission, Involute gear