双排行星齿轮系统的齿轮优化修形

The Optimized Gear Modification for Double-row Planetary Gear Train

金属带式CVT中采用行星轮机构来实现前进挡与倒挡的切换,而双排行星轮机构因增加了一排行星轮导致系统自由度增加,激励也随之增加,从而增大了CVT在倒挡时的啸叫噪声。本文中以某款金属带式CVT为研究对象,通过噪声测试和阶次分析判断其倒挡噪声来源为行星齿轮系。为降低其倒挡时齿轮啸叫,对双排行星轮机构进行动力学分析。考虑了齿侧间隙,建立了非线性纯扭振模型,并以行星齿轮振动加速度方差为目标函数,采用遗传算法对行星齿轮修形量进行优化,并对优化后的齿轮进行实验验证。结果表明,齿轮优化修形提升了该CVT的声品质。

Metal belt CVT uses planetary gear train （PGT） to fulfill the shifting between forward gear andreverse gear. Due to adding one row of planetary gear set, the degree-of-freedom of double-row PGT increases, lead-ing to the intensification of excitation and the whine noise of CVT in reverse gear. In view of these, a metal-belt CVTis studied in this paper, and it can be inferred through noise measurement and order analysis that gear whine in re-verse gear stems from PGT. In order to lower the gear whine in reverse gear, a kinetic analysis is conducted ondouble-row PGT. A nonlinear model for pure torsional vibration is developed with consideration of gear backlash,and an optimization on the magnitude of gear modification is performed using genetic algorithm with the vibration ac-celeration variance of planetary gears as objective function. The gears optimized are verified by tests with a resultshowing that the gear modification optimized enhances the sound quality of the CVT.