Fluid lubricated bearing and the comparison of oil bearing - bearing knowledge

Start with connected porosity is about 20% ( Volume fraction) And effective permeability is about 10 x 10 - 1. m。 Import of oil bearing work under the condition of low pressure, high speed, very little oil leak, the oil film is not very thin, so is mainly dominated by fluid lubrication. Oil bearing and fluid lubricated bearing and geomagnetic oil supply, compared to conventional bearing its smaller friction coefficient. This is because the generated in the upper portion of the bearing inside diameter of the air inside the cavity formed in the course of lubricating oil bubble, so that the apparent viscosity of lubricating oil decreases. But, under the condition of high pressure, low speed, oil leakage phenomenon is serious, the oil film thinning, in the area of fluid lubrication domain added boundary lubrication and solid contact friction, the friction coefficient rising sharply. Figure 6. For the critical point of the phenomenon. The critical point 6. Compared with the conventional bearing the tipping point c, prefer to low voltage, high speed side. This is because in for regular import bearings, lubricating oil leakage occurs only on both ends of the bearing, and for oil bearing, except at both ends of the lubricating oil will occur through the porosity of the porous body leak. The following investigation connected away L gap of about 30% ( Volume fraction) , effective permeability of about 10-100 x 1. m。 5 times. Lubricating oil leakage is, however, is related to the effective permeability, namely oil bearing Ⅱ lubricating oil leakage of an order of magnitude higher than oil bearing industry. Would mean, for oil bearing Ⅱ, keep the oil film thickness and the lubrication performance of the more difficult, so its critical point 6: on one side are rather low voltage, high speed. However, because of the two kinds of oil bearing imported bearing body away L gap containing lubricating oil, so not to enter a state of full stop for oil. So even more than I point 6. With 6. , with regular import bearing more than critical point of ct with c. Compared to its higher friction coefficient also quite gentle, not prone to 'burn' phenomenon.