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Bearing cooperation and load type linkage
Source: Bearing network time: 2018-05-04
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1 Fixed load effect on the radial load of the ferrule; accepted by part of the ferrule raceway; and transmitted to the opposite area of ​​the shaft or housing; this load is called fixed load. The fixed load is characterized by The radial load vector is relatively stopped with the ferrule. The ferrule and the component radial load are neither converted or rotated at the same speed. They are fixed loads. The ferrules that accept the fixed load can be loosely cooperative.
2 The rotating load effect is the radial load on the ferrule; it rotates in the circumferential direction of the raceway; it is accepted by each part in turn; this kind of load is called the rotating load.
The characteristics of the rotating load are that the radial load vector is related to the ferrule rotation. The rotating load has the following three conditions:
(1) The load direction is fixed; the ferrule is changed;
(2) the load vector rotates; the ferrule stops;
(3) The load vector rotates at a different speed than the ferrule.
3 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; if this is 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 the variable working state; some ferrules can be loaded with a load but a fixed load; time is a fixed load; time is a rocking load. This load is called an indefinite load.
The swaying load and the indefinite load should be treated equally with the rotating load in cooperation; too loose cooperation will lead to cooperation surface damage.
The ferrule and shaft or seat hole related to the rotation of the load direction; the transition cooperation or interference cooperation should be selected. The interference size should be used when the bearing is working under load; the ferrule does not occur on the cooperating appearance on the shaft or the seat hole. The “activity†is the criterion. The load is very light; or the ferrule has a low-speed transition under the heavy load effect; the transition cooperation can be selected; at this moment, the shaft appearance should have higher hardness and smaller surface roughness.
Regarding heavy load applications; generally, the cooperation should be tighter than in light load and normal load situations. The heavier the load; the greater the cooperative interference should be.
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