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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge> NTN imported bearings in the oscillation and the usual difference NTN imported bearings in the oscillation and the usual difference
Swing load and variable load. Sometimes the direction and size of the load cannot be determined locally; for example, in a high-speed rotating machine; except that the received rotor component is a fixed-direction load; there is also a rotating load caused by unbalanced mass; The rotating load is much larger than the fixed load; then the component load is still the rotating load; and if the rotating load is much smaller than the fixed load; the composition load is the rocking load. The rotating load is still the rocking load; its size and direction are both It is constantly changing. In variable working conditions; some ferrules can be loaded with a load but can be a rotating load; time is a fixed load; time is a rocking load. This load is called an indefinite load. The rocking load and the indefinite load are Cooperate should be treated equally with the rotating load; too loose cooperation will lead to damage to the cooperating surface. The ferrule and shaft or seat hole related to the rotation of the load direction; should choose the transition cooperation or interference cooperation. The interference size is under the load. During operation; the NTN bearing ring does not have an "active" appearance on the cooperating surface of the shaft or in the seat hole. The load is very light; or it is heavy Under the effect of the load, the ferrule may have a low-speed transition; the transitional cooperation may be selected; at this moment, the shaft appearance should have higher hardness and smaller surface roughness. Regarding heavy load occasions; usually should cooperate with light load and normal load occasions. It is tight. The heavier the load; the greater the cooperation should be. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
Fixed load. Effect on the radial load of the ferrule; accepted by a part of the ferrule raceway; and transmitted to the opposite area of ​​the shaft or Wuxi NTN bearing seat; this load is called fixed load. Fixed load characteristics It is composed of the radial load vector and the ferrule is relatively aborted. The ferrule and the component radial load do not change or rotate at the same speed are fixed loads. The ferrule that accepts the fixed load can be loosely cooperated. 3 Rotating load. The radial load on the ferrule; the rotation in the circumferential direction of the raceway; it is accepted by each part in turn; this load is called the rotational load. The characteristic of the rotating load is that the radial load vector is related to the ferrule rotation. The network professional professor analyzes the rotating load in the following three conditions: 1) the load direction is fixed; the ferrule is transformed; 2) the load vector is rotated; the ferrule is aborted; and (3) the load vector and the ferrule are rotated at different speeds.
At the top of the list, the oscillation state of NTN bearings in operation is reflected in the bearing measurement of the bearings, such as shedding, indentation, corrosion, cracks, and abrasion. The bearing oscillation is very sensitive to the damage of the bearing; therefore, the special NTN is selected. Bearing oscillating measuring device (frequency analyzer, etc.) can measure the large oscillation. ü De Shi Zhi 豢 豢 鲆 鲆 鲆 5 5 5 5 5 5 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于 由于It is different; it is necessary to analyze the measurement value of each machine beforehand and determine its discriminant specification.
Second, check the sound condition of the NTN bearing when it rolls over. Because the bearing has slight peeling and other damage, it will announce abnormal sounds and irregular sounds; therefore, the sounder can be used for differentiation; the sounder is selected; The size and sound quality of the bearing tumbling sound are viewed; it has the effect of preventing it early.
Third, to see the temperature of the NTN bearing transition, if the oil hole can directly measure the outer ring temperature of the NTN bearing; then more suitable. Under normal conditions; the temperature of the NTN bearing; usually can be estimated according to the temperature outside the bearing If it is smooth and the device is suitable, the bearing temperature will rise sharply; abnormal high temperature will occur; it is necessary to stop the work; take necessary precautions.
Usually; the temperature of the NTN bearing gradually rises with the beginning of the work; after 1-2 hours, it reaches a stable condition. The normal temperature of the bearing follows the heat capacity of the machine; the heat dissipation; the speed and load are different.
Whether it is on the shaft or in the bearing seat; the rolling bearing needs to fix its orientation in three directions: radial, axial and tangential directions. The radial and tangential positioning is done through the tight cooperation of the bearing rings. However, as long as the axial positioning is selected in a small number of conditions, axial limiting parts are usually selected; for example, the end cap and the retaining ring limit the axial orientation within the clearance scale.
In the selection and cooperation of rolling bearings, we should focus on the following four considerations:
1. Rolling bearing cooperation should make the bearing device and disassembly easy and convenient; save time and labor as much as possible; save three expenses.
2. There is also that the ferrule cannot slide in the direction of the tangential direction in its cooperation appearance; avoiding damage to the cooperation surface.
3, in order to reduce the deformation degree of the NTN bearing ring; and can fully exert the bearing capacity of the bearing; the bearing ring has the best outstanding support and uniform force.
4, it is necessary to get used to the axial orientation; there is a swimming ability within a certain scale; so the free end bearing is necessary to be compatible with the length of the shaft and NTN bearing housing hole change.
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NTN imported bearings in the oscillation and the usual difference
Source: China Bearing Network Time: 2014-02-02