奥贝球铁齿轮在柴油机上的应用研究

Research of Austempered ductile Iron Gears in Diesel Engine

研究了不同等温温度及 Mn、 Si、 Cu、 Mo对奥贝球铁组织和力学性能的影响，讨论了奥贝球铁加工硬化对机加工性能的影响。同时，将奥贝球铁齿轮代替 40Cr调质钢齿轮进行装机试验，对降噪声和耐磨性进行了测试。结果表明，奥贝球铁齿轮与 40Cr调质钢齿轮相比，力学性能高，柴油机整机噪声下降 1.92dB，齿轮侧噪声下降 5.3dB。奥贝球铁齿轮经过 45h磨合后，在标定工况下连续运转 200h，齿轮无异常磨损，齿轮间隙离极限间隙还有 0.13mm的余量，所以其摩擦磨损性能合格，所生产的奥贝球铁齿轮满足设计使用要求。

The influences of different austemper temperatures,content of manganese,silicon， copper and molybdenum on the microstructures and mechanical properties of austempered ductile iron (ADI)were studied.The effects of work hardening on machinablities of ADI were also discussed.Meanwhile some ADI gears replaced the 40Cr hardened and tempered steel gears in a diesel engine to test their functions of reducing noise and wear resistance.It was found that the mechanical properties of ADI gears were higher than that of 40Cr hardened and tempered steel gears.The ADI gears decreased the working noise of the whole diesel engine by 1.92dB and the noise in side of the gears by 5.3dB.After 45 hours' run-in and 200 hours’ continuous operation in demarcated conditions,there was no abnormal wear in the ADI gears and there still existed allowance of 0.13mm between limit gap and gear gap.So the frictional wear properties of ADI gears were qualified and the ADI gears produced could meet the design and appilication requirements.