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Check the status of the running machine and prepare a thorough inspection program has become increasingly serious. Among them, bearing the focus of attention, because it is the most important of all the machine's rotating parts. Condition monitoring is an important part of the preventive maintenance. Early detection to avoid equipment downtime due to bearing failure caused by unplanned maintenance during the bearing destruction. However, not all their are equipped with this state-of-the-art instruments. In this case, the machine operator or maintenance engineer must remain vigilant bearing fault signal, such as noise, temperature and vibration. "Listen", "touch" and "observe" the three important factors. The following views can be used as a reference.
The high temperature is often said that the bearings in an abnormal situation. The high temperature is also harmful to the lubricant within the bearing. Sometimes bearing overheated bearing lubricant can be attributed, if bearing long-term operation at temperatures over 125 degrees Celsius, will reduce bearing life, high temperature bearings caused by reasons including: lack of lubrication or over lubrication, lubricant containing impurities, the load is too large bearing damage, lack of space, and oil seals produce high temperature friction and so on. Thus continuous monitoring bearing temperature is necessary, either measuring the bearing itself or other important parts. If it is in the case of the operating conditions do not become any temperature change may indicate that a failure has occurred.
The bearing temperature is measured regularly by means of the thermometer can be accurately measured bearing temperature and in accordance with the degrees Celsius display. Importance of bearing, which means when it is damaged, resulting in the shutdown of the equipment, the best type of bearing temperature detectors should be retrofitted. Under normal circumstances, the bearing temperature rise after just lubrication or relubricated natural and lasts for one or two days.
1, bearing selection models: bearing type is generally technical personnel by the user according to the conditions of use of complementary products and loads of bearing selection. Business people understand the user's actual load bearing consistent with the selected bearings reach requirements should advise clients to re-election model, but unless special products in select models generally do not have any problems.
2, the choice of the bearing clearance: when users buy bearings usually only inform what type, grade, rarely be bearing clearance request, the business must ask clear-bearing conditions of use, the speed of the bearing temperature fit tolerances are directly related to the selection of the bearing clearance. General speed of 3500 rev / min motor mostly using CM clearance, such as high-temperature high-speed motor requires a relatively large clearance. Bearing clearance in the assembly because of the narrowing of the large and cylindrical bore up and lead to a reduction in the amount of reduction in clearance =, the interference x 60% (bearing chamber except aluminum). Such as bearings before assembly clearance is 0.01mm, the amount of interference in the assembly of 0.01mm, 0.004mm clearance after the bearing assembly. The theoretically bearing noise and life will achieve the best state in the zero clearance, but taking into account the temperature rise in the actual operation, the bearing clearance after assembly 0.002mm-0.004mm better.
Grease choice: the choice of grease is generally to be selected, according to the bearing speed, temperature, noise requirements and starting torque requirements of the business staff to understand the performance of various fats.
4 bearing seal type choice: bearing lubrication can be divided into oil lubrication and grease lubrication. Oil lubricated bearings are generally chosen form of bearings, grease lubricated bearings generally used in sealing shields or rubber seals. Dust cover suitable for high-temperature or use the good parts of the environment, points of contact seals and non-contact seal two seals, contact seal dustproof performance is good but the starting torque, fit seal starting torque is small, but the sealing performance No-contact is good.
Bearing in the automotive motor bearing, home appliance motor bearings, motorcycle bearings, health motor bearings and other specialized manufacturing industry, bearing noise and life to achieve the best.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7217A5TYNP5 NSK | 85 | 150 | 28 |
| 7217CTYNP5 NSK | 85 | 150 | 28 |