Cylindrical roller bearing due to the existence of clearance, under the action of load, the inner and outer ring will produce relative movement, which will reduce the stiffness of cylindrical roller bearing, cause radial and axial vibration of the shaft, so that the machine’s working accuracy and life are affected. In order to reduce the vibration, for high precision and high speed machinery, when installing a cylindrical roller bearing often adopt the method of preloaded, namely when installed in advance for cylindrical roller bearing a certain load (radial or axial), to eliminate the original clearance, but also makes the cylindrical roller bearing body elastic deformation and inner and outer ring, so as to prevent work relative movement between inside and outside the circle.

1. Cleanliness seriously affects the vibration level of bearings, especially the vibration of high frequency bands. The bearing with high cleanliness has a low vibration speed.

2, the impact on noise. The influence of dust in bearing grease on noise has been tested and it is proved that the more dust there is, the more noise there is.

3. Impact on lubrication Performance The decline of bearing cleanliness not only affects the formation of lubricating oil film, but also causes the deterioration of grease and accelerates its aging.

One, the purpose of pre-loading

Additive of spindle cylindrical roller bearing load, make the ball and the raceway eliminated the original clearance and formed certain elastic deformation, when under external load, have certain rigidity, cylindrical roller bearing has to load with the outside world force in the opposite direction of cylindrical roller bearing installation, not due to external load and make the ball and raceway clearance, Thus, the rotary precision of the spindle is improved, the rigidity of the spindle is strengthened and the service life is prolonged, and the noise is reduced.

Two, the principle of pre-loading

The size of pre-loading is generally determined according to the size of working load, spindle rotation accuracy and speed.

1, the spindle load is small, high rotation accuracy and low speed, can be larger pre-loading.

2, the working load is large, high speed, due to easy heat expansion, it is suitable for small pre-loading.

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