I would like to ask whether it is appropriate to use pins for positioning the outer ring of a bearing
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As shown in the figure, this is the non-driving end of a double-support pump, which consists of shaft bearings and thrust bearings. The outer ring of the thrust bearing is held in place by a pin; what are the potential problems with such a design, and how is it usual to prevent the ring from moving? Is this bearing a standard bearing?
First of all, fixing the pin on the outer ring of the bearing is nonsense; it may even cause damage to the bearing. It is impossible to have bearings with high smoothness and hardness for pin locks. Forcing prestress application can also cause uneven stress on the outer ring of the bearing, leading to its damage. Additionally, there are strict specifications for the mounting of bearings. If enlargement is required, it is recommended to use a conical chisel to create indentations on the surface of the bearing sleeve, thereby improving the fit at multiple points and addressing the issue of the bearing sleeve being too loose. (It’s mainly due to the protrusion at the edges of the pit when chiseling it.) ）
That one with the pin is a bearing sleeve, not a bearing! ! Here are two sets of angular contact bearings starting with 73, installed back to back; when using them as spare parts, pay attention to the load angle of the angular contact bearings. These two sets of bearings mainly bear axial forces, while the vast majority of the radial forces are carried by the sliding bearings. If these two sets of bearings experience high temperatures, it is either due to an incorrect balance disk clearance or an inappropriate size of the thrust surfaces. Damage to the outer bearing means that the thrust is too low, while it is too high for the inner bearing.
Normal, but rare. It is generally ensured through a transitional fit. Chuangzhi Zhonghe
The outermost part is the bearing sleeve; inside, there should be angular contact bearings used in pairs
Oh, thank you. I hadn’t noticed if you hadn’t mentioned it. Do you mean by the bearing angle the angle of contact? Isn’t that angle already inherent? What should I pay attention to during installation?
Also, why is the inner side so large? How should this be understood?
73 series bearings, which are contact ball bearings, are installed back-to-back or face-to-face to counteract part of the axial force and thus serve to position the rotor. When the gap between the balance discs is small and the thrust from the thrust surfaces of the balance discs is large, the axial force on the rotor acts in the axial direction from the inlet to the outlet; this force acts on the bearings inside the back-to-back arrangement. When the gap between the balance discs is large and the thrust from the thrust surfaces is small, the direction of the force is reversed, and it acts on the outer peripheral surface of the bearings. If this force becomes too great, it can cause the bearings to overheat and get damaged.
The approach for the 3rd floor is still up for discussion. Treating the rash symptoms does not address the root cause.