the working principle of the bearing oil film

Oil film bearing is a kind of medium as a journal bearing lubrication, and its working principle is: the rolling process, due to the role of rolling force, forcing the roller is moved journal, film journal bearing center and the centers generate eccentric, so that the oil film journal bearing and the gap formed between the two regions, called divergence zone (along the rotation direction of the journal gap gradually become larger), and the other is called convergence zone (along the direction of rotation decreases the journal .) When the rotation of the journal to a viscosity of lubricating oil into the convergence zone from the divergence zone along the rotation direction of the journal bearing clearance from large to small, the formation of an oil wedge, the pressure generated within the lubricant. Film pressure of each point along the rolling direction of the force is the oil film bearing capacity. When the rolling force is greater than the capacity, the journal bearing oil film between the centers of center and eccentricity increases. In the convergence zone along the journal bearing clearance steepened rotation, the minimum oil film thickness becomes smaller, the pressure within the larger film, larger capacity, until the balance with the rolling force, the journal center is no longer offset, bearing oil film completely separated by lubricants with the journal, in theory, the formation of a full-fluid lubrication.
Works from the oil film bearing oil film bearing system may know one of the most important parameter is the minimum film thickness. If the minimum film thickness is too small, and impurities in the metal particles in lubricating oil is too large, the dimensions of metal particles is greater than the value on the minimum film thickness, the metal particles with lubricating oil through the minimum film thickness at the time, as caused by metal contact will be severe Burnt. Also, if the value of the minimum film thickness is too small, when there is heap of steel and other accidents, it is likely to cause journal bearing oil film and the metal contacts which led to bush-burning. Minimum film thickness of oil film bearing size and the structure size and materials, precision machining and related oil film bearing system installation accuracy, lubricants, and the size of the rolling force.



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