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Smooth oil viscosity parameters
Source: Bearing network time: 2018-01-25
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The measurement of internal conflict force during material activity is called viscosity; in order to avoid contact surface wear between moving parts; smooth oil must have a satisfactory viscosity; viscosity value decreases with increasing temperature. It is the primary technical indicator of smooth oil; The viscosity should not be higher than the degree of engine launch; most smooth oils are classified according to their viscosity; viscosity is the primary basis for oil selection in various equipment. Viscosity is divided into two categories: positive viscosity and relative viscosity. The abundance viscosity is divided into dynamic viscosity and kinematic viscosity. The relative viscosity has several indication methods such as Enshi viscosity, Sai's viscosity and Rayleigh viscosity.
The commonly used kinematic viscosity and dynamic viscosity in China indicate the viscosity of the oil. The standard method for determining the kinematic viscosity is GB/T 265; that is, the moment when a certain volume of liquid flows through a calibrated glass capillary under gravity. The capillary constant and activity of the viscometer The product of time is the kinematic viscosity of the liquid at this temperature. The foreign standard measures for determining the kinematic viscosity of oil are ASTM D445 in the United States, DIN 51562 in Germany, and JIS K2283 in Japan.
Some oil products; such as hydraulic transmission fluid, vehicle gear oil and other low temperature viscosity is generally measured by Brookfield viscometer. China's GB/T 11145, the United States ASTM D2983 and Germany's DIN 51398 and other norms.
The use of excessively slick oil will increase the wear of the machine; in practice, select smooth oils of suitable viscosity; ensure the normal and reliable operation of mechanical equipment. Generally; low-speed and high-load applications; Oil; to ensure the satisfaction of the oil film thickness and normal smooth, high speed and low load applications; use less viscous oil; to ensure the normal starting and working torque of mechanical equipment; engine smooth oil viscosity is too large; slow activity, The upper flow is slow and the oil pressure is high; however, the smooth oil does not pass much; it cannot be added to the conflict appearance in time; the conflict occurs under continuous working conditions. The smooth oil circulation is slow; the smooth oil filter is less frequently. It is difficult to remove the worn metal chips, carbon particles and dust from the conflicting appearance in time. The viscosity of the smooth oil is high in the work; the conflicting force between the external parts of the machine conflict increases; to overcome the increased conflict force; More fuel consumption; together also reduced the engine's output power. Smooth oil viscosity; oil circulation speed is slow; its cooling and heat dissipation Poor; easy to overheat the engine. The temperature rise is small so that it can form an oil film between moving parts at various working temperatures.
Therefore, do not use smooth oil with excessive viscosity; let's not think that the viscosity is as high as possible. Under the condition of ensuring smoothness; according to the temperature scale at the time of use; use a smooth oil with a small viscosity as much as possible. The engine has a relatively large gap; a slightly thicker smooth oil can be used.
Viscosity is an important physical and chemical performance index for identifying the quality of smooth oil; it is of great significance for production; transportation and application.
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