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液压产品的国际贸易和应用的增长使人们需要更加看清全世界对液压产品的需求。在欧洲的某些发展,例如行走机械领域里的用变量柱塞泵的液压挖掘机和工业领域里的高压内啮合齿轮泵的发展,可以说明世界各地对液压产品的需求是有差别的。对不同地区不同应用场合所采用和期望的尺寸、转速、流量和压力范围以及油液和温度方面都将予以说明。在效率、生产率、可靠性、寿命周期、费用和可修理性或维修方便性方面的看法是很不相同的。其他方面,例如噪声要求和对具体结构形式的偏爱等,将予以说明并指出差别的原因。
The growth of international trade and applications of hydraulic products has made it necessary to see more about the world’s demand for hydraulic products. Some developments in Europe, such as the development of hydraulic excavators with variable-displacement piston pumps and high-pressure ring-gear pumps in the industrial sector, for example in the field of traveling machinery illustrate the differences in demand for hydraulic products around the world. The size, speed, flow and pressure range and the fluid and temperature used and expected for different applications in different regions will be described. The perceptions of efficiency, productivity, reliability, life cycle, cost and repairability or serviceability are quite different. Other aspects, such as noise requirements and preferences for specific structures, will be explained and the reasons for the differences noted.