“主驱动”的英语？

扭矩保护主驱动齿.Torque - protected main drive gear.意大利原装进口大功率串励主驱动轮总成, 无级调速, 行走平稳,动力强劲.Large power separately excited driving wheel assembly made in Italy, stepless speed, stable motion.介绍了彩钢板自动生产线的主驱动变频同步控制系统方案,阐述了主驱动变频同步控制系统的...