![]() ![]() ![]() The degree to which viscosity changes with temperature depends on the base oil type, such as mineral oil with VI between 85 to 100, polyalphaolefin with VI between 130 to 160 and polglycol with VI between 150 to 260. The higher the VI of a gear oil, the less viscosity changes with temperature. The changing of the viscosity with temperature is determined by the viscosity index (VI). We know that the viscosity and temperature are inversely proportional and we need to take care about high viscosity because of the losses which take place due the churning and squezzing. The higher the viscosity of the lubricating the thicker the film and this improve the properties against wear, damping and scuffing loading capacity. One important property of the gear oil is the viscosity and it has direct influence in the formation of the lubricant film. The lubricant is used in a gearing system mainly to control friction and wear between metal surfaces and to transfer heat away from the contact área. ![]() The purpose of this article is to provide some basic information about gear oil viscosity which can help engineers to specify the right gear oil. ![]()
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