What factors influence bearing limit speed, bearing limit speed correction

For bearing speed a lot of people still, the so-called bearing rotational speed limit is refers to the maximum allowable bearing rotating speed, it is with the bearing diameter and width decreases with the increasing of series series. Each of the rolling bearing speed, has certain limitations. When bearing rotation, with the accelerating speed, produced by bearing the internal friction heat temperature will also increase. Speed limit is not bite stick, overheating, sustainable operation speed permissible value of experience. Therefore, various bearing limit speed ( rpm) As bearing structure, size, cage structure, material, load bearing, lubrication method, including the cooling of bearing periphery. Net list below the bearing, the rolling bearing some of the factors limiting speed: 1, the lubrication method: using oil and gas or oil mist lubrication of the bearing can be uninterrupted trace new lubricant to the bearing supply, effectively guarantee the bearing oil film thickness. And spray lubrication way due to a large number of oil supply, can take away the heat generated by the bearing running quickly, improve bearing limit speed. 2, bearing load, the limit speed of rolling bearing under certain load, lubrication condition at the highest speed, type, size, direction, bearing lubrication method, game, keep frame structure, cooling condition, load ( Size, type, direction) Has much to do. Improve precision bearings, adjust bearing clearance limit speed of deep groove ball bearing can be improved. : 3, pre-tightening force bearing during installation if pre-tightening force will cause bearing during operation contact stress between roller and raceway surface increases, calorific value followed, leading to internal bearing preloaded force increases further, make the bearing more prone to wear and tear, lower limit of bearing. 4, drive mode: bearing limit speed will change with the different way of spindle drive, such as when driven by motorized spindle, spindle internal heat is larger, if the external use cooling at the same time, can lead to bigger bearing the inside and outside the circle of temperature difference, and increase the internal load bearing, leading to lower limit speed; Using external cooling due to the tolerances of the bearing with different amount of different thermal expansion of the bearing and the bearing seat, cooperate by clearance fit into interference fit outer ring, internal pre-tightening force increase and cause the limit speed changes. 5, the size of the bearing clearance, bearing after installation clearance for tiny negative, rated life is the longest, the bearing capacity and limit rotational speed is the highest at this moment, but because of the actual clearance to minus the fit interference and deformation caused by temperature difference, the tiny negative clearance is very difficult to control, and once clearance too much negative rated life will be significantly reduced, so, at present are generally choose close to 0 is clearance. 6, bearing combination: bearing combination, due to a large number of oil supply, can quickly take away the heat generated by the bearing, the limiting speed can be further improved. P bearing limit speed correction in the bearing load by more than 8% of the basic dynamic load rating, or axial load F more than radial load F. 20% of the working conditions, need in bearing size table records on the limit speed of correction coefficient is shown in figure 1 and figure 2 times, to correct speed limit. More than limit speed and rotational speed of bearing condition, should on the bearing accuracy, ( Internal) Clearance, and maintaining the frame structure, material selection, after fully research on lubrication methods must also take the forced circulation lubrication, splash lubrication, spray lubrication oil and lubrication and so on. Using the above countermeasures for high speed, can improve the speed limit. Or about to recorded in the table of oil lubrication bearing size limit rotational speed is shown in figure 1 times table after correction coefficient values. Contact rubber seal ball bearing the limit speed of sealed ball bearings, the contact type rubber seal ( DDU) The limit speed, mainly determined by the sealing lip sliding speed. The value recorded in the bearing size in table 3.