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①润滑油粘度问题的重要性有些人认为内燃机润滑油是粘度越大越好,这是不正确的,当然粘度少了也不行,必须适当。目前世界上各个工业发达国家所使用的内燃机润滑油都倾向于低粘度加抗磨添加剂,如日本近年生产的省能润滑油就是这样。根据流体力学、润滑的理论及实践证明,当油膜厚度δ>0.6μm时,润滑油膜符合于流体润滑的理论,则摩擦阻力决定于润滑油膜的内摩擦,因此动力损失大小也就取决于润滑油的粘度。内燃机的正常运行,必须保证各摩擦副得到充分的液体润滑,才能保证变摩擦副表面金属的固体摩擦为润滑油液体摩擦,而要保证得到液体润滑,润滑油的粘度问题,就成为
① the importance of viscosity of the oil Some people think that the internal combustion engine lubricating oil is the greater the better viscosity, which is not correct, of course, less viscosity will not work, it must be appropriate. At present, the lubricating oils for internal combustion engines used by all industrialized countries in the world all tend to be low viscosity and anti-wear additives. For example, the energy-saving lubricating oil produced in Japan in recent years is like this. According to the theory and practice of fluid mechanics and lubrication, it is proved that when the oil film thickness δ> 0.6μm, the lubricating oil film conforms to the theory of fluid lubrication, the frictional resistance depends on the internal friction of lubricating oil film, so the magnitude of the power loss also depends on the lubricating oil Viscosity. The normal operation of the internal combustion engine, must ensure that the friction pair is fully liquid lubrication, in order to ensure that the surface of the friction metal surface friction for the lubricating oil liquid friction, and to ensure that liquid lubrication, lubricating oil viscosity problems, it becomes