Bearing clearance is also known as bearing clearance. The so-called bearing clearance refers to the amount of movement when the bearing is fixed to one of the inner ring or the outer ring when it is not mounted on the shaft or the bearing housing, and then the radial or axial movement of the bearing clearance is not fixed. . According to the direction of movement, it can be divided into radial clearance and axial clearance. .
Bearing clearance selection [BYC Boying Bearing]
Bearing clearance is also known as bearing clearance. The so-called bearing clearance refers to the amount of movement when the bearing is fixed to one of the inner ring or the outer ring when it is not mounted on the shaft or the bearing housing, and then the radial or axial movement of the bearing clearance is not fixed. . According to the direction of movement, it can be divided into radial clearance and axial clearance. The size of the running clearance (called the working clearance) affects the rolling fatigue life, temperature rise, noise, vibration and other properties of the bearing.
1. Radial clearance selection
The radial clearance of the crossed roller bearings is not as small as possible. Not all bearings require a minimum working clearance. The appropriate clearance must be selected according to the conditions. The radial clearance of the crossed roller bearings is divided into 5 groups, of which 0 is the standard clearance. The basic radial clearance group is suitable for general operating conditions, conventional temperature and common interference fit: bearings with high temperature, high speed, low noise, low friction and other special conditions should use larger radial clearance; For radial bearings, it is advisable to use a small radial clearance; for roller bearings, a small working clearance can be maintained. In addition, there is no play for the separate type of bearing; finally, the working clearance after the bearing is installed is smaller than the original clearance before installation, because the bearing is subject to a certain load rotation, as well as the bearing fit and load. The amount of elastic deformation.
2. Selection of axial clearance
Centripetal thrust bearings and tapered roller bearings are usually mounted face to face or back to back, with the axial position of one of the bearing rings to determine internal clearance or preload. The choice of clearance and preload depends on the performance of the bearing configuration performance. There is a fixed relationship between the axial clearance and the radial clearance of such a bearing, and as long as one of the values ​​is satisfied, usually axial clearance is sufficient. Starting from the zero clearance condition, the specified clearance can be obtained by loosening or tightening the back nut on the shaft or adjusting the thickness of the spacer on the outer ring of the bearing.
3. Detection of clearance
There are several ways to check the radial clearance of the bearing. The easiest way to check is to turn the bearing by hand for inspection. The correct bearing can be rotated flexibly and smoothly without braking. Another method of checking shakes the outer ring of the bearing by hand. Even if there is a radial clearance of 0.01 mm, the uppermost point on the bearing should have an axial direction of 0.01 to 0.15 mm. The amount of movement. This method is only suitable for inspecting a single row of radial ball bearings and is not very effective for other types of bearings. The radial clearance of the bearing can also be detected with a gauge. Measure the thickness gauge between the rolling element bearing the unloaded part of the bearing and the outer ring f or the inner ring. This method is widely used to detect self-aligning bearings and cylindrical (cone) roller bearings. The radial clearance of the bearing can also be detected with a dial indicator. During the test, the outer ring of the bearing is lifted up and measured with a dial gauge.
The clearance to be detected after the bearing is installed is the installation clearance. The installation clearance is equal to the original clearance minus the clearance reduction caused by the installation. The clearance of the rolling bearing is adjustable, and some are not adjustable. Bearings with adjustable clearance are angular contact ball bearings, tapered roller bearings, thrust ball bearings and thrust roller bearings. The bearing clearances of the remaining categories are not adjustable. Bearings whose clearance is not adjustable shall be checked for clearance after assembly and during use. The inspection results determine whether reinstallation, repair or replacement is required. Bearings with adjustable clearance. Adjustments should be made both after installation and during use. By adjusting during use, it is possible to partially compensate for the increase in bearing play caused by bearing wear. Bearings with adjustable clearance, such as tapered roller bearings, have both radial clearance and axial clearance, and there is a certain geometric relationship between the two. For thrust bearings, only axial play has practical significance.
[BYC Boying Bearing Crossed Roller Bearing]
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Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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