Several factors about radial clearance of double row deep groove ball bearings

Double row deep groove ball bearings radial clearance means the one ring is immovable while the other ring in the direction moves from one extreme location to another location perpendicular to the axis of double row deep groove ball bearings. Selection of bearing clearance is correct or not, has a great deal of influence to running accuracy, bearing life, mechanical friction, temperature, vibration and noise of bearings. For example, when spherical bearings radial clearance is small, the number of rolling elements bearing the load increases contact stress reduces, and stably operates, but frictional resistance will increase, and temperature also increases. Therefore, depending on the bearings’ using conditions, choose the most suitable clearance values, is of great significance. Selecting bearing clearance, must fully take into account the following key factors:

1, Tightness between double row deep groove ball bearings with shaft and housing bore will result in changes of bearing clearance value. Generally, bearing clearance values after installation will reduce;

2, During the operation of double row deep groove ball bearings, due to the different cooling conditions of the axis and the shell, it makes the temperature difference between inner and outer rings, which will lead to the clearance values reducing;

3, Due to different coefficients of expansion of the shaft and housing materials, clearance value will reduce or increase too.

Factors to be considered for double row deep groove ball bearings radial clearance

Double row deep groove ball bearings radial clearance means the one ring stationary while the other ring in the direction perpendicular to the axis of double row deep groove ball bearings, by an extreme amount of moving location to another location. Selection of bearing clearance was correct or not, running accuracy, bearing life, mechanical friction, temperature, vibration and noise, has a great deal of influence. As for radial spherical plain bearings clearance of choice hours, you would make the number of rolling load increased contact stress reducing, functioning more smoothly, but friction will increase, temperature also increases. Conversely, increased contact stress, vibration, friction reducing, low temperature rise. Therefore, depending on the bearing conditions, choose the most suitable clearance values, is of great significance. Selected when in fact bearing clearance, must fully take into account the following key factors:

1, double row deep groove ball bearings with shaft and housing bore to cope with the elastic value changes will result in bearing clearance. General bearing after installation make the clearance values reduced;

2, double row deep groove ball bearings during the working of the institution, due to the different thermal conditions of the axis with the shell, making the temperature difference between inner and outer rings, which will lead to the clearance values reduced;

3, due to the shaft and housing materials for different coefficients of expansion, will result in clearance, reduces or increases the value.

Basic protection methods of double row deep groove ball bearings

Bearing must be cleaned with gasoline or kerosene before installing,and use after drying,in order to guarantee good lubrication.Double row deep groove ball bearings are grease lubricated, oil can also be used. When selecting grease lubrication,it should be free of impurities, function better, such as resistance to oxidation, rust prevention,and extreme pressure grease. Filling quantity of grease should not be too much,about 30% to 60% percent of the tank capacity of bearing. Double row deep groove ball bearings with seal structure have filled up grease, people can directly use, not to conduct any further cleaning.

When mounting, bearing required in putting equal pressure on the circumference of the ferrule end face, press the ring into.You shall not use lang first class tool directly to the bearing surface, so as not to damage the bearing. If mass installation, the hydraulic press can be used.It should guarantee the case shoulder side and end surfaces in the outer ring, inner ring and shaft shoulder-side surface clamping, there should be no gaps.