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美国得克萨斯州朗成乌的Marathon—LeTourneau公司是大型道路用工业车辆和设备的制造厂家,这些装备的零件热处理都有特殊的要求。该公司可生产前端斗式装载机、推土机、木材堆垛机、叉式升降卡车、货场吊车和巨型载重卡车(可装运土达170吨)。这些车辆的每个车轮都是由独立的电力系统驱动的。一台柴油发动机驱动一台直流发电机,这台发电机提供电力驱动每一个车轮的电动机。电动车轮驱动装置含有10只大小齿轮。小齿轮由SAE4820(20Ni3Mo)和9310钢制造,经过渗碳,淬火回火达硬度Rc60-63。倒向轴齿轮由SAE4340(40Ni2CrMo)
Marathon-LeTourneau in Longchenguu, Texas, USA, is the manufacturer of large-scale industrial vehicles and equipment for roads that have special requirements for heat treatment of parts. The company produces front-end bucket loaders, bulldozers, timber stackers, forklift trucks, freight yard cranes and giant trucks with a capacity of 170 tons of earth. Each wheel of these vehicles is driven by an independent power system. A diesel engine drives a DC generator that provides electric power to power each wheel. Electric wheel drive contains 10 sizes of gears. Pinion SAE4820 (20Ni3Mo) and 9310 steel manufacturing, after carburizing, quenching and tempering hardness Rc60-63. Reverse shaft gear from the SAE4340 (40Ni2CrMo)