General cylindrical roller bearings can only bear radial load, why is this, do you know?

Cylindrical roller bearings (such as: fag nu211e.xl.tvp2skf nnu4924bk/spw33) are generally only used to withstand radial loads, and only single-row bearings with stoppers on the inner and outer rings can withstand small directional axial loads or large clearance shafts to the load. 1. The relationship between the bearing and the load direction: Generally, the use of pure radial load requires deep groove ball bearings or cylindrical roller bearings, but if it is a thrust ball bearing, it can only bear a moderate amount of pure axial load. In addition, one-way thrust ball bearings can only support bearing loads from one direction. If it is a bidirectional thrust ball bearing or a bidirectional thrust angular contact bearing, it can bear bidirectional axial loads. For example, when the bearing bears combined radial and axial loads, angular contact ball bearings or tapered roller bearings are usually used. Combined load in 2 directions of advantage. However, in the case that the combined load bearing pot load is relatively large, the thrust bearing is only used to bear the axial load, and is not related to the radial load. When bearing an axial load with a suitable single row angular contact ball bearing or 4-point contact ball bearing, please maintain a suitable radial clearance between the outer ring and the seat hole. If the load acts off center of the bearing, a flow moment may be induced. According to stainless steel bearing manufacturers, both double row ball bearings can withstand flow moments, but it is recommended to choose opposing angular contact balls or opposing tapered roller bearings. Face-to-face type, back type is better. Of course, crossed tapered roller bearings can also be selected. 2. The relationship between bearing fit and load type 1) The combined radial load acting on the ring by the fixed load is borne by the partial area of ​​the ring track and transmitted to the opposite area of ​​the shaft or housing. This load is called a fixed load. The fixed load is characterized by the relative stationary of the resultant radial load vector and the orbital ring. Neither the ferrule nor the resultant radial load rotates, or rotation at the same speed is a fixed load. Ferrules subject to a fixed load may choose a loose fit. 2) The synthetic radial load acting on the ferrule by the rotating load rotates along the circumferential direction of the track and is borne by each part in turn. This load is called the rotating load. Rotational loads are characterized by the resulting radial load vector rotating with respect to the orbiting ring. There are the following three cases of rotating load. a. The direction of the load is constant, and the ferrule rotates. b. The load vector rotates and the orbital ring is stationary. c. The load vector and the ferrule rotate at different speeds. 3) Oscillating load and indeterminate load sometimes cannot correctly determine the direction and magnitude of the load. For example, in a high-speed rotating machine, in addition to the load that is fixed in the direction of the rotor weight, there is also a rotational load caused by an unbalanced mass. If such a rotating load is much larger than the fixed load, the resultant load is still a rotating load. On the other hand, if the rotating load is much smaller than the fixed load, the resultant load becomes the swing load. Whether it is a rotating or oscillating load, its magnitude and direction are constantly changing. On the other hand, in the variable working state, the load that the ferrule can bear is a rotating load, a fixed load, and sometimes a swing load. Such loads are called indefinite loads. Swing load and indefinite load should be handled in the same way as rotating load. Too loose will damage the mating surfaces. For ferrules and shaft or seat bores that rotate in the direction of load, select a transition fit or an interference fit. The size of the interference is based on the principle that when the bearing acts under load, the ferrule will not produce a 'creep' phenomenon on the joint surface on the shaft or in the seat hole. In addition, if the load is light, or the ferrule rotates at a low speed due to a heavy load, a transition fit can be selected. At this time, the shaft surface requires high hardness and small surface roughness. For heavy loads, the fit should generally be tighter than for light and normal loads. The heavier the load, the larger the interference should be.

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