Application of rolling bearings for KCB-2CY series gear oil

91. What should be paid attention to when choosing rolling bearings?

Answer: 1) the direction and nature of the load.

2) Requirements for self-aligning performance.

3) Bearing speed.

4) Economy.

5) High and low precision.

 

92. How to choose the lubrication mode of rolling bearing?

A: The normal operation of KCB gear oil pump bearing is related to lubrication. When the temperature of the medium is 80 degrees and the speed is below 2950r/min, dry oil lubrication is used.

When the temperature of the conveying medium exceeds 80 degrees and the power is large, the use of thin oil lubrication.

 

93. How to check the quality of rolling bearings?

Answer: there should be no spot, dent, peeling and peeling on the surface of rolling body and raceway.

Flexible rotation, hand rotation should be stable gradually slow down to stop, can not stop suddenly, there can be no vibration.

There should be a certain gap between the cage and the inner and outer rings. The isolation cage can be pushed by hand in the radial direction.

The clearance is within the standard range and measured by pressing lead.

 

94. What matters should we pay attention to when disassembling rolling bearings?

Answer: 1) the force position should be correct. The principle is that the shaft is matched with the inner ring and the outer ring is matched with the outer ring to avoid the deformation or injury of the rolling body and the raceway.

2) to apply force symmetrically, not only to one side, cause bearing deflection, gnaw shaft journal.

3) Before disassembly and assembly, the shaft and bearing should be cleaned without rust and burr.

 

95. What will happen if there is too much oil in the bearing box?

Answer: the bearing box is filled with too much oil, and the bearing has no cooling space, which will cause the bearing to get hot.

 

96. How to check the radial clearance of rolling bearings?

Answer: measurements made with lead method and feeler, KCB radial clearance translation gear pump in the bearing code mark, not bearing clearance according to its inner diameter is different, the size of the look-up table to determine, in the general case of the rolling bearing radial clearance is not greater than three over one thousand of the bearing inner diameter, the centripetal short columns bearing radial clearance is not greater than two over one thousand of the bearing inner diameter.

 

97. Why should rolling bearings be pretightened?

Answer: in assembly angular contact ball bearing or centripetal ball bearings, if to the bearing inner and outer circle to certain axial load, the inner and outer ring relative displacement will occur at this moment, to eliminate the gap between the inner and outer ring and roller, the initial elastic deformation, are preloaded can improve the rotary accuracy and life of bearing, reduce the vibration of the shaft.

 

98. How to realize rolling bearing pretightening?

Answer: 1) pretightening is realized by the thickness difference between the inner and outer gasket rings of the bearing.

2) Pretightening is realized by spring, and the bearing is pretightened by spring acting on the outer ring of the bearing.

3) narrow the inner ring or outer ring used in pairs to achieve pretightening.

4) Adjust the axial position of the inner ring of the bearing cone hole to realize pretightening.

 

99. What are the principles of substitution for rolling bearings?

Answer: 1) the technical parameters such as the working capacity coefficient and allowable static load of the bearing should be equal to or higher than the technical parameters of the original bearing.

2) The allowable limit speed shall be equal to or higher than the actual speed of the original bearing.

3) The accuracy level of the substitute bearing should not be lower than that of the original bearing.

4) The size should be the same. It is not allowed to change the size of the machine and the bearing because of the replacement of the bearing.

5) For bearings using the nesting method, the concentricity of the inner and outer cylindrical surfaces nested should be guaranteed, and the tolerance and fit should be correctly selected.

 

100. What kinds of fixing methods are there for rolling bearings?

Answer: 1) bi-directional fixation with force on one side, 2) bi-directional fixation with force on both sides,#) mixed fixation

 

101. What is the bearing oil level determined according to?

A: For rolling bearings, the lowest center line of bearings is the normal oil level, the lower third of the ball is low oil level, the center line of the ball is above two thirds of the high oil level, for the lubrication device of the spindle is oil ring, the oil ring is generally 1.5-2 times the diameter of the lubricating spindle.

The oil level of the oil chamber should be a certain distance from the spindle oil, which is generally half of the diameter of the spindle or about 5mm from the high oil level of the bearing bush.