The oil film bearing seat is a radial sliding bearing seat with smooth oil as the smooth medium. The task principle is: during the rolling process, due to the rolling force, the roller shaft journal is forced to move, and the oil film bearing seat is center of gravity. Fairness with the center of gravity of the journal, so that the gap between the oil film bearing housing and the journal forms two areas, one is the diverging area (the gap is gradually increased along the direction of the journal rotation), and the other is the convergence area (along the journal) The direction of rotation is gradually reduced). When the rotating journal brings the viscous smooth oil from the diverging zone into the convergent zone, the bearing seat clearance becomes larger and smaller along the direction of the journal rotation, forming an oil wedge, which causes pressure in the smooth oil. The resultant force of the pressure at each point in the oil film along the rolling direction is the bearing capacity of the oil film bearing housing. When the rolling force is greater than the bearing capacity, the fair distance between the center of gravity of the journal and the center of gravity of the oil film bearing housing increases. In the asymmetry zone, the bearing seat clearance becomes steeper along the direction of the journal rotation, the minimum oil film thickness becomes smaller, the pressure in the oil film becomes larger, and the bearing capacity becomes larger until the rolling force reaches equilibrium, and the center of gravity of the journal is no longer offset, the oil film The bearing housing and the journal are completely separated by a smooth oil, which actually constitutes a fluid-smooth finish.
From the mission principle of the oil film bearing housing, it is known that one of the most important parameters in the oil-membrane housing is the minimum oil film thickness. If the minimum oil film thickness value is too small, and the metal impurity particles in the smooth oil are too large, and the outer size of the metal particles is numerically larger than the minimum oil film thickness, the metal particles follow the minimum oil film thickness as the smooth oil passes the metal contact. When it is serious, it will burn tiles. In addition, if the minimum oil film thickness value is too small, when an accident such as a pile of steel is displayed, it is easy to form a metal contact between the journal and the oil film bearing seat to incur a burnt tile. The minimum oil film thickness value is related to the structural size and data of the oil film bearing housing, the machining accuracy of the coherent parts, the accuracy of the oil film bearing housing, the smooth oil and the rolling force.
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