Smooth oil bath is the most common smooth way in bearings, suitable for the smoothness of low and medium speed bearings. A part of the bearing is immersed in the groove, the smooth oil is brought up by the rotating spherical roller bearing part, and then flows back to the oil groove oil surface should be slightly lower than the center of the lowest rolling element.
The drip smoothness is suitable for the bearing parts that need to be quantitatively supplied with smooth oil. The amount of oil dripping is preferably every 3-8 seconds, and excessive oil quantity will cause the bearing temperature to increase.
The oil is pumped to the INA bearing component by an oil pump, filtered and cooled by the smooth oil after the bearing. Because the circulating oil can take away a certain amount of heat and cool the bearing, this method is used for the spherical roller bearing parts with higher rotation speed.
The use of boring shrinking air is mixed with smooth oil through a sprayer to create an oil mist. In the radial bearing, the air flow can effectively cool the bearing and prevent the intrusion of impurities. This method is suitable for the smoothness of high speed and low temperature bearing components.
The low pressure oil is injected into the bearing through the nozzle by the oil pump, and the oil injected into the bearing flows into the oil groove through the other end of the bearing. When the bearing rotates at high speed, the rolling element and the cage also cause airflow around the surrounding air at a relatively high rotational speed. It is difficult to send the smooth oil to the bearing in a smooth manner. In this case, it is necessary to spray the smooth oil with low-pressure radiation. In the bearing, the position of the nozzle should be placed between the inner ring and the center of the cage.
1) Compared with roller bearings, ball bearings have higher limit speeds, so ball bearings should be preferred when moving at high speeds.
2) Under the condition of the same inner diameter, the smaller the outer diameter, the smaller the rolling element, and the smaller the centrifugal inertia force of the rolling element on the outer ring raceway during running, the more suitable for higher speed. Work under. When placed at high speed, it is advisable to use ultra-light, extra-light and light series bearings. Spherical roller bearings for heavy and extra heavy series are only used for low speed and heavy load applications. If a light series INA bearing is used and the bearing capacity is not up to standard, a wide series of bearings can be considered, or two light series bearings can be used together.
3) The material and structure of the cage have a great influence on the bearing speed. The solid cage allows for a higher rotational speed than the stamped cage.
4) The bearing speed is very low. When the working speed is high, if the axial load is not very large, the angular contact ball bearing can be used to bear the pure axial force.
5) If the working speed slightly exceeds the limit speed specified in the sample, you can increase the tolerance level of the spherical roller bearing, or increase the radial clearance of the bearing appropriately, and choose circulating lubrication or oil mist lubrication to strengthen the circulating oil. Cooling and other measures to improve the high speed performance of the bearing. If the working speed exceeds the limit speed, special high-speed rolling bearings should be used.
At normal speed, the speed does not affect the choice of type, only when the speed is high, there will be a significant impact. The limit speed nlim of various types and sizes of bearings is included in the INA bearing sample. This speed refers to the maximum allowable speed when the load is not too large (P ≤ 0.1C, C is the basic dynamic load rating), the cooling condition is normal, and the bearing is a 0-level tolerance bearing. However, since the limit speed is mainly limited by the temperature rise during operation, the limit speed in the sample cannot be considered as an absolutely unsurpassable limit. If the operating speed of the spherical roller bearing exceeds the limit speed, the measures proposed in clause 5 below may be taken.
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