Cylindrical Roller Bearing Method Of Radial Clearance
The rolling body is the centripetal roller bearing for cylindrical roller. The internal structure of cylindrical roller bearing by roller are arranged in parallel, with intervals between roller device or the isolation piece, can prevent roller friction between tilt or roller, effectively prevent the rotation torque increases.
Cylindrical roller bearing belongs to the separation type bearing, installation and disassembly is very convenient. Cylindrical roller bearing can withstand a large radial load and is suitable for use in high-speed operation.
This type of bearing allows the inner circle axis to be small to the Angle of the outer circle axis. Only 2 '~ 4'. Therefore, the machining accuracy of shaft and bearing pedestal is relatively high or it is easy to have uneven load or stress concentration in the contact part of the raceway. However, the stress concentration can be reduced after the correction of roller or raceway contact bus.
Cylindrical roller bearings can be divided into single columns, double columns and multi-row cylindrical roller bearings according to the number of columns in the rolling body. Different structural bearings are also shown in the position design of the edge. The common cylindrical roller bearings have the following forms:
Single row cylindrical roller bearings, single row cylindrical roller bearing is separable bearing, easy to install and disassemble, both ring can be used in a tight fit, the correction between roller and raceway contact wires can reduce the stress concentration.
Double row cylindrical roller bearing: double row cylindrical roller bearing belongs to swimming bearing, and its separability makes installation and disassembly convenient. The two sets can be used to fit together. Double row cylindrical roller bearings are rarely allowed to have tilt Angle.
Radial clearance adjustment of cylindrical roller bearings:
Cylindrical roller bearing selection easy selection of optimal automation can provide fast, fixed load on the load of the synthesis of radial load from the local ring raceway exposed the fixing ring, and sent to the corresponding axis or local bearing. The characteristic of this load is that the radial load vector is a relatively static synthesis and ring. The load cycle can be used relatively loosely.
Rotating load is applied to the synthesis of direction along the circumference of the roller radial load full of cylindrical roller bearing ring, turning parts, such as the burden of rotation, this is the resultant vector phase rotating ring radial load, bear. Work closely in ring spinning load, under special circumstances, the load, if elected, is light or heavy load, under the low speed of ring only occasionally, bearing adopts hard material and the surface roughness is high, the rotating load to bear ring can also be used to more loose.
Third load oscillation, the load or no load direction of synthetic direction uncertain load ring radial load, its characteristic is the synthetic ring radial load vector circle, in a certain region within the impact load, the vibration of the load, its direction is swinging, roll to bear a certain area, or acting on the bearing load, the load value change constantly. To bear the load bearing swing, outer ring and weekly, bearing, hole should be used closely.
The methods of adjusting the radial clearance of the cylindrical roller bearings are as follows:
1. The lateral clearance of the cylinder and the oval bearing can be adjusted by the method of scraping and scraping by hand or bearing.
2. The top gap of the cylinder and the oval bearing can be adjusted by means of manual scraping or condition permitting.
3. For the multi-oil wedge fixed bearing, it is not allowed to shave and adjust the gap between the axial tiles in principle, and replace the new tile when the gap is not timely.
4. For the multi-oil wedge tilting type bearing, it is not allowed to repair the tile, and the gap should be replaced because of the tile. For a thickness adjustable tile, the wattage can be adjusted by adding a stainless steel pad under the tile behind the tile, or by reducing the thickness of the block. Note that the multi-oil wedge can be tilted, and the thickness of the tile in the same group should be less than 0.01 mm.
In normal use, vibration is very sensitive to the damage of the bearing, such as peeling, indentation, rust, crack, wear and so on will be reflected in the bearing vibration measurement. Therefore, the vibration size can be measured by special bearing vibration measuring instrument (frequency analyzer, etc.), which can be inferred by frequency distribution. The measured value is different from the use condition of the bearing or the location of the sensor installation. Therefore, it is necessary to analyze and compare the measured value of each machine in advance to determine the judging standard.
The temperature in
It is often expressed in high temperature that cylindrical roller bearings are in abnormal condition. High temperature is also bad for bearing lubricants. Sometimes the bearing overheating can be attributed to the lubricant of the bearing. If the bearing temperature for a long time even the transfer of more than 125 ℃ lower bearing life. The reasons for the high temperature bearing include: insufficient lubrication or excessive lubrication, impurities in roller bearings, excessive speed limit and long - term overloading of bearing.