Bearing clearance is also known as bearing clearance. The so-called bearing clearance, that is, the bearing is not installed in the shaft or bearing box, the inner ring or outer ring of its side fixed, and then the bearing clearance is not fixed side to do radial or axial movement when the amount of movement. According to the direction of movement, can be divided into radial clearance and axial clearance. Running clearance (called work clearance) of the size of the bearing rolling fatigue life, temperature rise, noise, vibration and other performance has an impact.
Often friends encounter bearing clearance is always adjusted badly, very affect the use and reduce efficiency, which in the end is why it is? Let’s take a look.
Bearings in the process of use, in many cases are due to fatigue and failure, which is likely to be caused by poor adjustment of bearing clearance, according to statistics, 34% bearing fatigue is caused by clearance adjustment. The following we analyze the bearing clearance adjustment related knowledge, hope it will help you.
The radial clearance size after installation is determined by the tolerance of the selected shell hole and shaft.
The larger the interference between them, the smaller the radial clearance after installation. Therefore, the correct choice and bearing with the shaft and hole tolerance is very important.
Its interference amount is not like the cylindrical hole bearing bore, as determined by the tolerance of the selected shaft, but depends on the bearing in the tapered journal or tapered tightening sleeve on the push in distance of the length.
Bearing clearance standard is no national regulations depends on the use of: or quite complex issues, briefly described as follows:
1, using a tighter fit, the inner and outer ring temperature difference, the need to reduce the friction torque and deep groove ball bearings to bear large axial load or need to improve the alignment performance of the occasion, it is appropriate to use a large clearance group.
2, when the rotational accuracy requirements are high or need to strictly limit the axial displacement, should use small clearance group.
1、 The inner ring of the bearing and the shaft fit.
2、 The outer ring of the bearing and the housing hole fit.
3, the influence of temperature.
Note: radial clearance reduction and with the actual effective interference size of the parts, with the shaft diameter size, shell hole wall thickness related.
(1) pressure lead wire
Check the axial clearance of the rolling bearing with fingers, this method is applied to the occasion of the shaft end exposed. When the end of the shaft is closed or for other reasons and can not be checked with a finger, can check whether the shaft rotation flexible.
(2) check with plug gauge, operation method and plug check radial clearance of the same method, but the axial clearance should be c = 1/ (2sin, Q formula c one by one axial clearance, mm; e one by one plug gauge thickness, mm; a – bearing taper angle, (°).
(3) check with a micrometer, use the pry bar to tug the shaft so that the shaft in two extreme position, the difference of the micrometer reading that is the axial clearance of the bearing. But the force added to the pry bar can not be too large, otherwise the shell occurs elastic deformation, even if the deformation is very small, also affect the accuracy of the measured axial clearance. The stallion is born with two wings, Hongtu Zhuang Kyushu, Luoyang Hongjun bearing for you.
1, use the nut installed in the bearing shell to push the pressure on the outer ring of the bearing gland to adjust.
2, take to add or subtract the thickness of the shim between the bearing cover and the seat to adjust.
Gear hundred position adjustment.
Gear position adjustment: because the gear and shaft installation form is mostly used at one end for the shoulder or step positioning, the other end of the positioning is mainly used spacer, so the gear position can only be adjusted by adding or subtracting the length of the degree spacer.
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