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美国最早約于本世紀20年代开始有液压传动挖掘机的萌芽。30—40年代是各类液压挖掘机的大发展时期。到目前为止,美国約已有10多个公司制造这类挖掘机,品种总数近50种。专門制造液压挖掘机的厂家主要有:Ford,Case,John Deere,Wain-Roy,Wagner,Baclger,Warner & Swasey等近10家;在生产机械传动挖掘机的同时兼而生产液压挖掘机的厂家主要有:Lorain,Link-Belt,Manitowac,Bucyrus-Erie等4—5家。在中小功率万能挖掘机中,由采用液压操縱到全液压传动,从发展上看,大致經历了四个阶段,表現为下列四种不同的基本类型(目前这四种类型同时存在):
In the United States, the earliest possible start of hydraulic drive excavators began in the 1920s. The 30-40s was a period of great development for all types of hydraulic excavators. So far, about 10 companies in the United States have manufactured such excavators. The total number of varieties is nearly 50. The specialized manufacturers of hydraulic excavators mainly include: Ford, Case, John Deere, Wain-Roy, Wagner, Baclger, Warner & Swasey, etc. Nearly 10 manufacturers; in the production of mechanical transmission excavators and the simultaneous production of hydraulic excavator manufacturers There are 4-5 Lorain, Link-Belt, Manitowac, Bucyrus-Erie, etc. In the medium and small-power universal excavators, from the hydraulic control to the full hydraulic drive, from the development point of view, it has gone through four stages, and it is represented by the following four basic types (these four types currently exist at the same time):