However, under high pressure and low speed conditions, the phenomenon of lubricating oil leakage is serious, the oil film is thinned, and boundary lubrication and solid contact friction are added in the fluid lubrication area, so that the friction coefficient sharply rises. Figure 6. The critical point for this phenomenon. This critical point is 6. Compared with the critical point c in a conventional bearing, it is more biased toward the low pressure, high speed side. This is because, in the case of a conventional imported bearing, the leakage of the lubricating oil only occurs at both ends of the bearing, and for the oil-impregnated bearing, in addition to the both ends, the lubricating oil leaks through the pores of the porous body. Next, the connectivity 孑L gap is about 30% (volume fraction), and the effective gas permeability is about 100×10-1. m. Oil-bearing bearing II, the connected porosity is 1.5 times that of the oil-impregnated bearing I, and the oil content is also 1.5 times. However, the leakage of lubricating oil is related to the effective gas permeability, that is, the leakage amount of the lubricating oil of the oil bearing II is an order of magnitude higher than that of the oil bearing. That is to say, for the oil-impregnated bearing II, it is more difficult to maintain the thickness and lubrication performance of the oil film, so the critical point 6 is more biased toward the low pressure and high speed side.
However, since the oil-filled bearing in the inlet bearing body of the two oil-impregnated bearings contains lubricating oil, it does not enter a state in which the oil supply is completely stopped. Therefore, even if it exceeds the I critical point of 6. With 6. , with conventional inlet bearings exceeding the critical points ct and c. In comparison, the increase in the coefficient of friction is relatively flat, and it is not prone to "burning".
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