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The stability of smooth grease on the effect of rolling bearings
Source: China Bearing Network Time: 2014-01-16
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The plastic viscosity of the fat is greater than the viscosity of the base oil; the smooth fat film has clear elasticity; therefore its load resistance is greater than the base oil. Only the viscosity of the base oil is appropriate; the anti-loading effect of the smooth grease is ineffective. Smooth or extreme pressure smooth conditions; mainly rely on additives to improve wear resistance and extreme pressure; satisfactory smooth conditions.
Correct use of smooth grease; must know the movement of the grease in the bearing. The movement of the smooth grease filled in the rolling bearing; followed by the rotation of the bearing; can be roughly divided into two periods. In general, the smoothness in the bearing The amount of grease filled; always spans the theoretical demand for direct participation in smoothness; during the initial period of bearing imperfections; most smooth grease is squeezed out of the raceway very quickly (less than a minute); In the cavity of the cover; and in the middle of the roll body constitute a generalization. In this process Lu; because of the resistance of the remaining smooth grease; the bearing temperature rises quickly. Although most of the remaining smooth grease is extruded at the beginning of the work; And the smooth grease squeezed in the raceway attachment can still be transformed into the roll between the raceways. These smooth greases are circulated along with the bearing transition body; they are continuously discharged in large quantities. At this time, the bearing temperature continues to rise. Until the remaining smooth fat is completely discharged.
It can be called the smooth grease during the running; according to the smooth grease quality, filling amount and other factors in the bearing layout; this time can continue for ten minutes; even hours.
After the remaining smooth grease is completely discharged; the remaining large amount of smooth grease is on the touch surface of the tumbler, the raceway, and the holder; the cusp effect forms a thin layer of smooth lipid film; then enters the normal ç› period of the bearing. At this time, the temperature gradually decreases and reaches a balanced shape. That is to say; a temporary smoothing effect; mainly relying on this layer of smooth grease film to undertake. In addition; in the temporary working process of the bearing; the generality of the rolling body and the raceway and Adhere to the smooth grease on the shelf to shrink and part of the base oil; after flowing into the raceway; there is also a certain compensation effect on smoothness.
Different smooth greases are different in the general composition of the bearings; they must be composed in a general analogy; the moments of walking are short; the bearing temperature is low in temporary work; and the fluctuations; this is a comparative ambition Smooth grease; so it is especially important for smooth grease.
Some so-called eddy-type smooth greases are otherwise; it is not easy to constitute a generalization; even if the generalization is simply collapsed; then the remaining smooth grease that is repeatedly returned to the raceway is temporarily in a mixed state; the bearing torque is large; the temperature is high; Unbalanced; noise can also occur; smooth grease is also simply metamorphosed and lost.
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