Basic conditions for the maintenance and use of TIMKEN bearing grease

In the early stages of TIMKEN bearing operation, most of the grease was squeezed out of the raceway very quickly (less than a minute), and accumulated in the grease after the reincarnation of the bearing migration transition body, was gradually discharged a small amount. At this time, the bearing temperature will continue to rise until the excess bearing grease is completely discharged, which can be called the walking phase of the grease. Depending on the quality of the grease in the bearing structure, the filling amount, etc., this time may last for more than a dozen. Minutes, even hours.
In the process of using TIMKEN bearings, especially when lubricating the bearings, pay attention to the amount of grease. If you use grease precisely, ask everyone to understand the movement of the grease in the bearing 6316-2RS to ensure the stability of the grease. The movement of the grease filled in the rolling bearing, followed by the modification of the bearing, can be roughly divided into two stages. The difference between the bearing grease and the contour of the bearing is different. It must be composed of a relatively straight draft. It should be short-lived. The TIMKEN bearing has a low temperature and is stable during long-term operation. This is a kind of fantasy. The grease is so special for the grease of the bearing grease.
Under special conditions, the following special requirements must be imposed on the lubricant:
1. Long life requirements The service life of lubricants is required to be extremely long.
2, harmless requirements
3, low temperature requirements Requires resistance to low temperatures below -63 °C.
4. Low friction torque requirements The frictional resistance of the lubricant is required to be low.
5, the boundary lubrication characteristics are good
6, high temperature requirements Requires high temperature resistance above 250 °C.
7. High vacuum resistance requirements Under high vacuum conditions, it is not volatile, does not dissipate, and does not deteriorate, especially under high vacuum conditions under weightless conditions.

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Introduction to the method of preventing the failure of the Endian bearing by lubrication

  1. The raceway is peeled off:
It is inclined to peel off the belt on the working surface of the Entine bearing, which indicates that the bearing is working under the inclined state. When the inclination angle reaches or exceeds the critical state, it is easy to form abnormal sharp wear and peeling at an early stage. The main reason is that the installation is poor, the shaft has deflection, the journal and the shell hole have low precision, and the countermeasures are taken to ensure the quality of the bearing installation and improve the axial runout accuracy of the shoulder and the shoulder.
  2. Ferrule break:
Fracture failure of ferrules is generally less common and is often caused by sudden overloads. The causes are more complicated, such as raw material defects (bubbles, shrinkage holes), forging defects (overburning), heat treatment defects (overheating), processing defects (partial burns or surface microcracks), host defects (unstable installation, Lack of lubrication, transient overload, etc., may cause the ferrule to break once it is subjected to an overload shock load or severe vibration. Take measures to avoid overload shock loads, select appropriate interference, improve installation accuracy, improve operating conditions, and enhance quality control during bearing manufacturing.
3. The channel is peeled off at a symmetrical position in the circumferential direction:
The symmetrical position spalling shows that the inner ring is spalled around the inner ring, and the outer ring is peeled off in a circumferentially symmetric position (ie, the short axis direction of the ellipse). The reason for this is mainly because the outer hole of the outer shell is too large or the two half are separated. This is particularly evident in camshaft bearings for motorcycles. When the needle bearing is pressed into the elliptical housing hole or the two halves are fastened, the outer ring of the Endian bearing is elliptical, and the clearance in the short axis direction is significantly reduced or even negative.
Under the action of the load, the inner ring rotates to produce circumferential peeling marks, and the outer ring only produces peeling marks at the symmetrical position in the short axis direction. This is the main reason for the early failure of the bearing. After testing the failure of the bearing, the roundness of the outer diameter of the bearing has been changed from 0.8μm to 27μm. This value is much larger than the radial clearance value. Therefore, it can be confirmed that the bearing is working under severe deformation and negative play, and it is easy to form abnormal sharp wear and peeling at the early stage. The countermeasures taken are to improve the machining accuracy of the outer casing hole or to use the two-half separation structure of the outer casing hole as much as possible.

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