Abstract: The paper presents a practical method of designing, calculating, manufacturing and testing high speed DCA gears to turbo-blowers with 3000kW power for getting higher quality and lower noise. The gears, 118m/s pitch speed and 163N/cm2 load factor, have been fine hobbed, nitrided and honed up to Ra 0.3 micrometer surface roughness and JB4021-85 quality level 5. The experimental results show that gearing noise has been made down to 92.5 dB (A) at certain ratio by appropriately relieving from starting mesh end to another.

Key words: 氮化, 高速双圆弧齿轮, 衍齿