The bearing temperature can generally be inferred from the external temperature of the bearing seat. However, it is more accurate to directly measure the temperature of Timken bearing outer ring with oil hole. The bearing temperature rises gradually from the beginning of operation, and the temperature is usually stable after 1 ~ 2 hours.
If the bearing is not installed Bearing Grease Stability properly, the temperature will rise sharply, resulting in abnormal high temperature. The reasons are too much lubricant, too small bearing clearance, poor installation, excessive friction of sealing device, etc.
In the case of high-speed rotation, the wrong selection of bearing structure and lubrication mode is also the reason.
The rotating sound of the bearing is checked with a stethoscope, and there are strong metal noise, abnormal sound, irregular sound and other abnormalities. The Bearing Grease Stability reasons are poor lubrication, poor accuracy of shaft or bearing seat, bearing damage, foreign matter intrusion, etc.
Different greases form different profiles in Timken bearings. The profile must be quite drafted, and the walking time is short. In the long-term operation, the bearing temperature is low and stable. This is a kind of fantasy grease, so the channelization of grease is particularly important.
Under popular conditions, the filling amount of grease in Timken bearing always exceeds the practical demand of direct intervention Bearing Grease Stability lubrication, fills the cavity on the support and the bearing cover, and forms a contour on the periphery of the rolling element.
During this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the initial stage of operation, and the grease squeezed in the accessories of the raceway may still be migrated and transformed into the rolling element and brought into the raceway.
most of the grease is quickly squeezed out of the raceway (less than one minute), and the accumulated grease is discharged in small quantities in succession as the bearing moves and changes. At this time, the bearing Wendu continues to rise until all the excess grease is discharged, which can be called the running in stage of grease.
According to the quality and filling amount of grease in the bearing Bearing Grease Stability structure, this period may last for more than ten minutes or even several hours.
It may not be necessary to use high-pressure grease when greasing anti friction bearings, unless it is used with great caution. High pressure can damage bearings and waste grease.
Excessive grease can cause high temperature, bring danger and create an invisible environment around Timken bearings. In most applications, ball or roller bearings can be fully lubricated if the grease level accounts for one-third to one-half of the bearing capacity. The excess will usually be discharged by the sealing shell and wasted.
The anti friction bearings in all Timken bearings basically contain two hardened steel rings, multiple Bearing Grease Stability hardened balls or rollers, and a separating roller or roller separating frame or cage.
These types are divided into many types in use. Some types, such as Bearing Grease Stability needle column bearings, may have no inner ring and the roller moves directly on the hardened shaft.
1. Antirust performance
The antirust agent is insoluble in water and has good adhesion. It can form an oil film on the surface of steel.
2. Mechanical stability
If the mechanical stability of the grease is not enough, the structure of the soap of the grease will be Bearing Grease Stability mechanically disintegrated during operation, resulting in the destruction of the grease and loss of lubrication.
3. Oil seal
Oil seal is a necessary barrier to protect deep groove ball bearing and lubricant from external Bearing Grease Stability pollution. During the operation of Timken bearing, no matter sundries or moisture can penetrate into Timken bearing to prevent damage to it.
4. Mixed grease
Do not mix incompatible oils and fats. If two incompatible oils and Bearing Grease Stability fats are mixed, their consistency will soften, and Timken bearing may be damaged due to easy loss of grease.
5. Classification of oils and fats
The consistency and lubricating ability of grease are affected by the working temperature. Timken bearings operating at a certain temperature must choose grease with correct consistency and good lubricating effect at the same temperature.
In general, the filling amount of Bearing Grease Stability grease in the deep groove ball bearing always exceeds the actual demand for direct lubrication. It is on the holder and in the cavity of the bearing cover, and forms a contour on the periphery of the rolling element.
During this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the initial stage of operation, and the grease squeezed in the accessories of the raceway may still be brought into the raceway by the rotating rolling element.
In the initial stage of the bearing, most of the grease is quickly squeezed out of the raceway (less than one minute), and the accumulated grease is discharged in a small amount while circulating with the rotating body of the bearing. At this time, the bearing temperature continues to rise until all the excess bearing grease is discharged,
which can be called the running in stage of grease. According to the Bearing Grease Stability quality and filling amount of grease in Timken bearing structure, this period may last for more than ten minutes or even several hours.
After the remaining bearing grease is completely discharged, the remaining small amount of grease forms a thin layer of grease film on the mutual contact surface of rolling element, raceway and cage through the action of wedge, so as to enter the normal stage of bearing.
At this time, the temperature gradually decreases and reaches equilibrium. In other words, the long-term lubrication mainly depends on this layer of grease film. In addition, during the long-term operation of the bearing,
the lubricating grease on the contour near the rolling element and raceway and on the cage will shrink and separate part of the base oil, which will also supplement the lubrication after flowing into the raceway.
Different bearing greases form different contours in the bearing. The contour must be formed. It is quite draft, the running in time is short, and the bearing temperature is low and stable in long-term operation. This is an ideal grease, so it is particularly important for the channelization of the grease.
Some so-called vortex type greases are not the case. They are not easy to form a contour. Even if the contour is formed, they are easy to collapse.
At this time, the excess grease returning to the raceway repeatedly is in the condition of forced stirring for a long time. Timken bearing has large torque, high temperature and imbalance, which may also produce noise, and the grease is easy to deteriorate and lose.