Oil film bearing seat is a kind of radial sliding bearing seat with smooth oil as smooth medium. Its mission principle is: In rolling process, due to the effect of rolling force, force the roller shaft neck appear to move, the oil film bearing centre of gravity is fair with the journal's center of gravity, the oil film bearing clearance between shaft neck and make up the two areas, one is called divergent section (along the axis neck rotation direction gradually get larger space), another is called convergence zone (along the axis of rotation direction gradually reduce neck). When the rotating journal brings the smooth oil with viscosity from the divergence zone to the convergence zone, the gap between the bearing seat along the rotating direction of the journal is large or small, forming a kind of oil wedge, so that the pressure in the smooth oil occurs. 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 seat. 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 seat increases. In the convergence zone, the clearance of the bearing seat steepens along the rotating direction of the journal, the minimum oil film thickness becomes smaller, the pressure in the oil film increases, and the bearing capacity increases until it reaches equilibrium with the rolling force, and the center of gravity of the journal is no longer offset. The oil film bearing seat and the journal are separated by smooth oil, which actually constitutes a full fluid smoothness.
From the task principle of oil film bearing seat can know that one of the most important parameters in the piecemeal oil film bearing seat is the minimum oil film thickness. If the minimum oil film thickness value is too small, and the metal impurities in the smooth oil particles are too large, the size of the metal particles in the numerical value is greater than the minimum oil film thickness, metal particles with the smooth oil through the minimum oil film thickness, like the formation of metal contact, serious will burn tile. In addition, if the minimum oil film thickness value is too small, when it shows the heap steel and other accidents, it is easy to form the metal contact between the journal and the oil film bearing seat and cause burning tile. The minimum oil film thickness value is related to the structure size and data of oil film bearing seat, the processing accuracy of relevant parts and the device accuracy of oil film bearing seat, smooth oil and the size of rolling force.
Post time: Apr-13-2022