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Application of fine rolling bearings in electronic special equipment (2)
Source: Bearing network time: 2018-02-28
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In order to form a smooth oil film between the roller elements and the raceway; only a few smooth oils are needed. The grease smoothing method is the most simple and thorough selection, but for high-speed spindle bearings; it is necessary to use oil smooth; because of this situation Smooth grease has a very short service life.
A: Fine angle touch ball bearing
B: Paired fine angle touch ball bearing set
C: double row cylindrical roller bearing, double direction angular touch thrust ball bearing
D: The normal working time of the tapered roller bearing grease smoothing method is related to the type of bearing and the size and speed. When using the grease smoothing method; pay attention to the selection of the smooth grease type; the calculation and time of loading the bearing cavity smooth grease amount Short low-speed test run. In practice; can not be ignored during the test run; in order to evenly distribute smooth grease and squeeze out too much smooth grease.
Area A: lack of smooth oil; roller elements and tracks do not constitute useful film; T and WF will increase agility. Area B: smooth oil just right; T and WF are the smallest. Area C: added smooth oil; Both T and WF will be added and the addition of T will be more undulating. Area D: continue to add oil; WF will increase; T will slowly decrease after reaching the highest point. The balance between heat dissipation and conflicting force. Area E: Continuously add oil The amount of T will decrease agile after M point; this is because oil cooling dominates. B reflects the smoothing method of fuel injection; D reflects the smooth characteristics of oil circulation.
When using oil smooth, pay attention to the selection of the method and the viscosity of the oil and the determination of the oil quantity. It should be reasonably selected according to the detailed environment and conditions.
2. 8 Sealing It is necessary to use a sealed seal between the inside and the outside when using a fine roll bearing. Consider the following elements; including ambient conditions, smoothing methods, seal wrap speed, seal conflicts, and temperature rise caused by seal conflicts.
About the fine roll bearing; the final two elements are more important. Because the seal conflict is likely to occur the heat that the bearing can not bear. Therefore, the high-precision fine rolling bearing often uses a non-rubber seal.
The non-rubber seal features are constructed from their end cap layout; they can be used in axial, radial or axial and radial combinations. This seal has no conflict and wear.
The rubber seal touches the seal appearance; because the conflicting force of the touch causes the temperature to rise; the application of the rubber seal is bound by certain conditions. This method is rarely used for the sealing of fine roll bearings, this method is only suitable for low speed conditions.
The use of rubber seals and non-rubber seals; can improve the sealing effect. In practice; when the critical speed is less than 1m / s; can use V-shaped rubber seal; this application conflict is very strong. magnesium.
3 Application examples because the shaft end jump and the runoff demand are higher; it is medium speed; therefore, the fine angle touch ball bearing is used. The bearing pairing application is divided into two groups; one set is axially fixed; one set is axially outer ring relaxed In order to eliminate the influence of shaft deformation on the normal operation of the bearing due to temperature rise. The placement method is beneficial to improve the stiffness of the shafting and the effect of handling the messy load. The installation spacer is used to achieve the purpose of obtaining the preload. The contact method of non-touch seal and rubber seal is selected, and the grease smooth method is selected to be smooth.
4 Conclusion Fine rolling bearings are widely used in electronic professional equipment. The most important thing in the detailed scrolling shaft drawing is the reasonable use of fine rolling bearings. This paper summarizes several aspects that should be paid attention to in the application of fine rolling bearings; After the use of examples to discuss the concept of the text, fine rolling bearings as long as the correct use; can carry forward its excellent functions.
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| Bearing related knowledge |
| Grease, such as safety in the bearing, the effect of the tapered roller bearing, the first applicable cage and the accuracy of the rolling bearing, the correct use of the NTN bearing method, the method of discriminating the locomotive rolling bearing problem |
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