Cylindrical roller bearings use common sense
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| Time：2016.10.18 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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1 Note the use of rolling bearings are precision parts, and therefore require a corresponding caution when using the attitude, even the use of high-performance bearings, if used improperly, can not achieve the desired performance results, so the use of bearings should note the following :
1.1 Keep the bearing and its surroundings clean. Even if the invisible tiny dust into the bearing, will increase the bearing wear, vibration and noise.
1.2 The use of installation carefully, does not allow strong stamping, hammer is not allowed to directly hit the bearing, does not allow the transfer of pressure through the rolling body.
1.3 use appropriate and accurate installation tools, try to use special tools, try to avoid the use of cloth and short fiber and the like.
1.4 to prevent corrosion of bearings, bearing directly to take the hand, it is necessary to wash away the hands of sweat, and coated with high-quality mineral oil after the operation, especially in the rainy season and summer to pay attention to rust.
2 with
2.1 with the choice of the size of the inner diameter and outer diameter of the rolling bearing is manufactured according to standard tolerances, the bearing inner ring and shaft, the outer ring and seat hole with the degree of tightness can only control the journal tolerance and seat hole tolerance to achieve. Bearing inner ring and the shaft with the base hole system, the bearing outer ring and the hole with the axis of the system. The correct choice of cooperation, we must know the actual bearing load conditions, operating temperature and other requirements, but in fact it is very difficult. Therefore, the majority of cases are selected according to the use of lapping.
2.2 Selection of the nature of the load should first consider the relative rotation of the load vector with the ring. According to the synthetic radial load vector relative to the rotation of the ferrule, the load on the ferrule can be divided into: fixed load, rotary load and swing load.
A. The fixed radial load acting on the ferrule is borne by the local area of the ring raceway and is transmitted to the corresponding local area of the shaft or housing. This load is called a fixed load. Which is characterized by synthetic radial load vector and the ring is relatively stationary. To bear the load of the ring can choose a more loose fit.
B. Rotational load The resultant radial load acting on the ferrule rotates in the circumferential direction of the race track and is subsequently subjected to various loads. This load is referred to as the rotational load and is characterized by the resultant radial load vector relative to the rotation of the ferrule . Under special circumstances, such as the load is very light, or under heavy load only occasional low-speed rotation of the rings, bearing the choice of harder materials and high surface roughness, to withstand the rotation load of the Rings can also be used with a loose fit.
C. Swing load on the ring on the synthesis of radial load direction of uncertainty, this load is called the swing load or unidirectional load, which is characterized by the role of the ring on the composite radial load vector in a certain raceway ring The load in a certain area of the raceway, or the load acting on the bearing, is the load of the shock load, the vibration load, its direction, and its value. Bear the swing load bearing, the outer ring and the week, bearing, with the hole should be used with the tight.
2.3 Load size The amount of over-win between the ring and the shaft or shell depends on the magnitude of the load, the heavier load with larger over-win, and the lighter load with smaller over-win. Usually divided into radial equivalent load p "light", "normal", "heavy" load of three cases.
2.4 Shaft and shell hole tolerance zone selection according to the size and nature of the load.
2.5 with the surface roughness and shape and position tolerance with the surface roughness and shape and position tolerance, a direct impact on product performance, such as wear resistance, corrosion resistance and with the nature. For this reason, it is very important to improve the connection strength of the win-win coordination for the stability of the matching properties, by defining the geometrical tolerances of the shaft and shell holes and the roughness requirements of the mating surfaces.
3 bearing installation is good or bad, will affect the bearing accuracy, life and performance. Therefore, please fully study the bearing installation.
3.1 cleaning bearings and related parts, (already grease lubricated bearings and bilateral oil seal or dust cover, seal ring bearings need not be cleaned before installation.)
3.2 Check the size of the relevant parts and finishing
3.3 Installation Bearing installation should be based on the bearing structure, size and bearing components with the nature of the pressure should be directly added to the tightly fitting ring face, not through the rolling body transfer of pressure, bearing installation generally use the following methods:
Pressing into the bearing inner ring and the shaft to make a tight fit, the outer ring and the bearing seat hole is more loose when the press can be used to press the bearing mounted on the shaft, and then the shaft together with the bearing into the bearing hole , Press fit in the bearing inner ring face, the pad of a soft metal material to do the assembly casing (copper or mild steel). The inner diameter of the fitting sleeve should be slightly larger than the diameter of the journal and the outer diameter should be slightly smaller than the inner ring of the bearing to avoid pressure on the cage. Bearing outer ring and bearing seat with the hole, the inner ring and the shaft is more loose fit, the bearing can be pressed into the first bearing hole, then the outer diameter of the assembly tube should be slightly smaller than the hole diameter, if the bearing ring With the shaft and seat holes are tightly fitted, the installation of indoor and external rings to be pressed into the shaft and seat hole, the structure of the casing should be able to tighten the bearing inner ring and outer ring end.
B. Heating Fit The method of fitting a tight fit into a loose fit by thermal expansion of the bearing or housing. Is a common and labor-saving installation method. This method is suitable for the installation of a large amount of interference bearing, hot before the bearing or separable bearing rings into the tank evenly heated 80-100 ℃, and then removed from the oil as soon as possible to the shaft, To prevent cooling after the end of the inner ring and the shoulder is not tight fit, the bearing can be cooled after axial fastening. Bearing outer ring and light metal bearing tight fit, the use of heated bearing seat of the hot method, you can avoid with the surface by abrasions. When the bearing is heated by the oil tank, there should be a grid at a certain distance from the bottom of the tank, or the bearing should be hung on the bottom of the box to prevent the impurity from entering into the bearing or uneven heating. There must be a thermometer in the oil tank. Control oil temperature shall not exceed 100 ℃, in order to prevent the occurrence of tempering effect, so that the hardness of the ring reduced.
C. Installation of tapered bore bearings Tapered bore bearings can be mounted directly on the taper of the journal, or mounted on the adapter sleeve and withdrawal cone on the cone, the degree of tightness can be used to reduce the amount of bearing radial clearance Therefore, the installation should be measured before the radial bearing clearance, the installation process should always measure the clearance in order to achieve the required reduction in the amount of clearance until the installation of the general installation of the lock nut can also be used to install the heating method .
D. Thrust bearing installation Thrust bearing with the axis of the general cooperation with the transition, the seat ring and the bearing hole with the gap with the general, so this bearing easier to install, two-way thrust bearing shaft axis should be in the shaft To prevent rotation relative to the shaft. Bearing installation method, under normal circumstances is the majority of shaft rotation, so the inner ring and the shaft with the win-win cooperation with the bearing outer ring and bearing room with the gap for the match.
3.4 Inspection after bearing installation
3.5 Lubricant addition
4 Check the bearing operation After the installation of bearings, should immediately check the operation to determine whether the installation is normal.
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