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发动机设计中,在完善了润滑系统之后,为了保证发动机可靠的润滑,对润滑油的性能有严格的要求。粘度 粘度是衡量机油性能的重要指标,粘度大易于形成油膜,润滑的可靠程度大,但粘度太大会形成较大的摩擦阻力,对启动和冷却不利,相反润滑油粘度过小,零件有可能直接发生接触而增加磨损。机油的粘度一般随温度而变化,因此发动机使用机油应按季节和使用条件进行适当选择。凝固点 所谓凝固点即机油冷却到完全不能流动
Engine design, after the improvement of the lubrication system, in order to ensure reliable engine lubrication, the performance of lubricants have strict requirements. Viscosity Viscosity is an important indicator of the performance of the oil, the viscosity is easy to form a film of oil, lubricating a large degree of reliability, but the viscosity is too large will form a larger friction resistance, start-up and cooling adversely contrary to the oil viscosity is too small, the parts may be direct Occurs to increase wear and tear. The viscosity of the oil generally varies with temperature, so the engine oil should be selected according to the season and the conditions of use. Freezing point The so-called freezing point of oil cooling to completely flow