The main points of heavy-duty bearing selection are basically the same as those for high-rigidity bearings.
The application of heavy-duty bearings must be considered in conjunction with the working characteristics of heavy-duty bearings. Heavy-duty bearings are often in high-stress conditions, and bearings are sensitive to high stresses. Therefore, all aspects of the application technology must strive to slow the stress of the bearing, and the stress reduction is very beneficial to extend the life of the bearing. For example, a high-load machine can multiply a single bearing of a certain fulcrum to two to withstand the radial load under the condition of the axial position, and the fulcrum is under the same workpiece condition despite the influence of load unevenness. The life of the two bearings is expected to increase by more than two times compared to the original single bearing. In fact, heavy-duty machines often use multiple bearings or multiple rows of bearings at one fulcrum to withstand radial loads.
1. Heavy-duty bearing coordination, clearance and lubrication
The fit, clearance and lubrication of heavy-duty bearings must be considered uniformly.
In order to reduce the stress of heavy-duty bearings, it is desirable to have a thicker lubricating film layer, so it is preferred to use a higher viscosity lubricating oil or a higher viscosity oil as a base oil grease, and at the same time, in the case of ensuring good lubrication, Do not use too much frictional torque due to lubricant viscosity
The interference interference of the heavy-duty bearing rotating ferrule is larger than the normal situation, and this has an adverse effect on the deformation of the raceway and the bearing life. Therefore, if possible, it is desirable to reduce the interference properly, which requires lowering the mating surface. Roughness, while maintaining normal lubrication, because the lubrication fails, the excessive frictional torque on the surface of the heavy-duty lower raceway strengthens the creeping tendency of the mating surface, and even slips, although these phenomena occur mostly in the outer ring, but when severe The inner ring is also inevitable. The actual fit of the outer ring should not cause excessive gaps to prevent the grease from penetrating into the surface, which promotes the occurrence of slipping, and makes the ferrule easy to deform and reduce the bearing area of the bearing.
Only after careful and effective measures are taken, it is allowed to appropriately reduce the interference of heavy bearings. However, although the interference is slightly reduced, the improvement of the bearing stress state is greater. Of course, the advantage of thickening the oil film is greater.
Due to the large contact area of the rolling surface of the bearing under heavy load and the tight fit, the ferrule is close to the amount and deformation, so the clearance of the bearing is usually larger.
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