Should I choose bearing clearance or preloading?
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These are the front and back pages of the same book; wouldn’t that play disappear after applying a preload shim? Won’t this become an interference fit? Can these two be guaranteed at the same time?
I want both. There’s no need to make many adjustments to the bearings. We’ve talked a lot about the issue of clearance, but in practice, how many people are able to do that? Not many. Why? We still don’t understand what clearance is, and how it can be adjusted on the equipment.
Pre-tensioning is definitely necessary; it is done to increase stiffness. The degree of pre-tensioning depends on the requirements of your equipment. If it’s too tight, heat will be generated, while if it’s too loose, the desired effect won’t be achieved and the lifespan of the component will be reduced； The interference and clearance you mentioned simply can’t reach the extreme levels
We repaired the AY pumps that were installed back-to-back without using any shims, and the bearings that were removed also didn’t have any shims attached. If shims are needed, then their thickness is probably just a few tenths of a millimeter? We only have copper sheets in 0.05mm, 0.1, and 0.2 thicknesses. The book says that a grinder can be used to achieve the desired thickness?
When equipping a pump, after positioning the bearings, we need to check the bearing clearance. By looking at the readings on the gauge, we can determine whether the bearing clearance is within the technical requirements specified. If it is, the bearing will adjust itself. What’s referred to here is the bearing clearance; as for the number of threads that need to be adjusted, I can say that this is rarely necessary in equipment operating at speeds below 2900 revolutions per minute. 【The chiller is not included. 】
This post was last edited by Frozen Desert on 2020-11-26 08:18. Isn’t the serial length the axial clearance between the outer ring of the bearing and the cover? Isn’t the clearance the gap between the outer and inner rings of a bearing and the rolling elements? Does the clearance still exist after preloading is applied?
The preload magnitude should be equal to the clearance size; too much preload will result in tightness while too little will lead to looseness. The method is to turn the shaft, using this action to adjust the preload