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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,Lubrication,Members:,张景帅 张良萌,张自信 李淑磊,左帅 张重,一、,Definition of lubrication,二、,Type of lubrication,三、,Benefits of lubrication,定义：在两摩擦外表间参加润滑剂，形成润滑膜，而起到降低摩擦、减轻磨损和散热降温的作用-这种方法称为润滑。,一、,Definition of lubrication,fluid lubrication,solid lubrication,fluid lubrication,boundary lubrication,mixture lubrication,按润滑材料分,按摩擦状态分,二、,Type of lubrication,If the lubricating film”s pressure is supplied by an external source,the system is said to be lubricated hydrostatically.,假设润滑膜的压力是由外源供给的，这种系统就称为流体静压润滑,1,If the pressure between the surfaces is generated as a result of the shape and motion of the surefaces themselves,the system is hydrodynamically lubricated.,假设滑动外表之间的压力是由于滑动面本身的外形和运动所共同产生的，这种系统就称为流体动压润滑,2,a.润滑：削减摩擦、降低磨损；,b.冷却(cooling)：润滑剂在循环中将摩擦热带走，降低温度防止烧伤；,c.洗涤：从摩擦面上洗净污秽，金属粉粒等异物；,d.密封(sealing)：防止水分和其他杂物进入；,e.防锈蚀(corrode)：使金属外表与空气隔离开，防止氧化；,f.减震卸荷：对往复运动机件有减震、缓冲、降低噪音的作用，压力润滑系统有使设备启动时卸荷和削减起动力矩的作用；,g.传递动力：在液压系统中，油是传递动力的介质。,三、,Benefits of lubrication,Friction control,The amount and character of the,lubricant,made available to sliding surfaces,have a,profound,effect,upon,the,friction,that is,encountered,.,滑动面之间润滑剂的数量和性质对所产生的摩擦力有极大的影响。,have a effect upon,对,有影响,Temperature control,Lubricants assist in controlling temperature by reducing friction and carrying off the heat that is generated.Effectiveness depends upon the amount of lubricant supplied,the ambient temperature,and the provision for external cooling.To a lesser extent,the type of lubricant also affects surface temperature.,润滑剂有助于通过削减摩擦和带走产生的热量来掌握温度。有效性取决于润滑油的供给量、环境温度和外部冷却的规定。润滑剂的种类在较小程度上也影响外表温度。,Wear control,They reduce,abrasive,and solid-to-solid contact wear by providing a film that increases the distance between the sliding surfaces,thereby lessening the damage by abrasive,contaminants,and surface,asperities,.,润滑剂通过润滑膜来增加滑动面之间的距离，从而减轻磨料污染物和外表凹凸不平造成的损伤，因此减轻了磨蚀和由固体与固体之间接触造成的磨损。,When machinery is in use,the lubricant controls corrosion by coating lubricated parts with a protective film that may contain additives to neutralize corrosive materials.,当机器在使用时，润滑剂通过涂层爱护润滑件来掌握腐蚀，而爱护膜可能含有添加剂来中和腐蚀性物质。,coating 涂料，包衣 additives 添加剂,neutralize 抵消，中和.,Corrosion prevention,Lubricating grease frequently performs the special function of forming a seal retain lubricants or to exclude contaminants,Grease 润滑脂，黄油,Contaminants 污染物，污垢物,润滑脂通常还有一个特殊作用，就是形成密封层以防止润滑剂外泄和污染物进入,Sealing,