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Rolling bearing both the rolling friction is also have sliding friction. Sliding friction is due in rolling bearing surface curve of deviation and load bearing deformation and cause. Such as rolling body and ring in between, because the ball and the ring is not absolutely rigid, their contact areas to produce the elastic deformation, always in line contact for contacts or, but in fact in load working conditions are always to become surface contact, therefore it has a different diameter point of contact with different linear velocity resulting sliding friction. Also due to various reasons would also make rolling body and keep device and keep device and the internal and external ring occurs between sliding friction. And sliding friction with the speed and load increases, in order to reduce friction and wear, reduce temperature, noise, prevent bearing components rust, correctly choose lubricant and adopt reasonable lubrication methods to control the lubricant, appropriate amount is an important subject of improving bearing life.
1, rolling bearing with fat oil or the basis:
Rolling bearings use the advantages of lubricating oil are:
1) in certain operation norm, by the use of lubricant grease lubrication than starting torque and friction losses significantly smaller.
2) because the grease in play in circulation heat can be taken away, so the cooling effect can make bearing achieve relatively high rotation speed.
3) can ensure the use of high temperature.
4) change fat, must remove the links parts, oil lubrication, there is not this trouble.
5) the bearing reducer with lubricating oil is very appropriate, because oil at the same time to splash means to achieve and lubrication gear and bearing purpose.
6) in bearing grease gradually been products in the product, abrasive, wear from the outside after sealing device penetration and itself the product which stains the aging, such as not promptly replace, then cause bearing, and accelerated wear liquid lubricant, can be applied by filtering guarantee its normal operation.
With grease-lubricated rolling bearings of advantages:
1) individual bearing point, must use, such as changing hands often go with fat is both save trouble can avoid again for lack of oil and cause accidents.
2) fat itself to have sealed action, such can allow using seal of high degree to the purpose of simplified design institution.
3) experience proof in a certain speed range (n < 20000r/min or 20000mm dn < j r/min) using lithium base grease-lubricated than using oil dripping method has lower temperature and longer bearing life.
2, rolling bearing lubrication theory basis: rolling bearing lubrication mechanism is to belong to the elastohyddrodynamic lubrication theory.
Three, rolling bearing failure types and lubrication relationships: most failure reason is because there is something wrong with poor, seal assembly the damage. A few failure reason is due to the lack of or excessive or quality lubricants unqualified due to wear, agglutination, corrosion and overheat, etc.
4 and the basic characteristics of the grease and the general standard: choose a grease
Choose a grease, must choose and use conditions (temperature, speed, load and adapt to the environment, all of these and grease on the basic characteristics of the grease, and the basic characteristics of the grease depends on thickener and base oil species.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7210ADT NSK | 50 | 90 | 20 |
| 7010CDT NSK | 50 | 80 | 16 |