Rolling friction ball bearings for its small, start-sensitive, high-efficiency, high precision rotation, lubrication is simple, easy to replace and many other advantages and is widely used in the production and life. However, because the manufacture of high precision, complex process, the current standard of rolling bearings are used in jet production, by professional factory manufacturing. Since the original design between the spindle bearing inner ring, outer ring, rolling, etc. These rigid parts with little regard adjustable links, so important bearing precision index - the radial clearance depends mainly on machining tolerances to be guaranteed. Thus, even with a high precision machine to machine the bearing parts, due to the method of the inevitable accumulation of influence of the error, it is difficult to use directly by the assembly to achieve the required precision. Generally required by measuring the selection method with a packet assembler to assemble, but still finite precision, high prices make high-precision bearings. While bearing in the use of wear caused by the ultra-poor clearance can not be compensated, lowering real life, resulting in waste. With the development of production, the urgent need to address the technical issues. To this end, the author through analysis and research, to find the main factors bearing radial clearance precision. Then the structure bearing a reasonable design from the start, to design a new structure, the agricultural bearings radial clearance can easily be adjusted to solve the above technical problems. After trial, the better, are made with a brief introduction.
design ideas, works and concrete structures
As we all know, to adjust the bearing radial clearance, you must change the relative positional relationship between the outer ring, inner ring, rolling elements of these three, intuitive approach is to make the inner ring of the outside or inside of the outer ring can be varied as desired. In terms of ball bearings, a method in which prior machining of the bearing inner ring bore into a certain taper, while cooperating therewith are machined journal corresponding taper. Changing the position of the inner ring after assembly on the shaft of the attachment shaft, so that the outer diameter of the inner ring deforms to cause changes to adjust the bearing clearance. In all fairness, this is a better way, can solve this problem to a certain extent, it followed so far. But there are a few obvious shortcomings, namely limited adjustment amount (even very small), clearance on large powerless. Second, the journal to be processed at a higher precision taper, and the need to set up additional adjustment device, so that the axis of the complex manufacturing process. Third, the inner ring under a lot of prestressing, and for the circumferential tensile stress is extremely detrimental to the bearing strength, and sometimes even when adjusting inner "no war since the break." Thus, the traditional approach is not reasonable, a great need for improvement.
Bearing structure analysis shows that the inner part has already been done in this article, it seems no potential to be tapped. The rolling body is "monolithic" obviously "unprofitable." Naturally, we have to look to the outer ring up. But this part of it is simply another Jane, conventional thinking can not start them, must be another way. After wrestling, multi advice, repeated scrutiny, finally enlightened. Realized that: change the bearing radial clearance, like war, like, not only forced the onslaught from the front (radial), or you can take from the side roundabout clever (axial). Prerequisite is to break the traditional stereotype thinking imprison shackles and force of habit, to dare to innovate. It is a bold vision of the bearing outer ring along the cross-section cut, split into two (reverse thinking, reduced to complicated). About two and a half can make relative axial movement, and then by means of the interaction of specific surface and rolling fairways of the inner body, the relative axial displacement of the outer ring into a radial displacement of the rolling elements and thus receives indirect change within the effect of the radial position between rings, the outer ring, rolling three, to adjust the clearance purposes. Based on this, we can have the following technical solutions: the outer ring of the rolling bearing by-piece to the axial split modular, with double rows of rolling elements, combined with the adjustment shim set. Increase or decrease in the assembly by adjusting the thickness of the gasket to easily adjust the bearing radial clearance to the desired value, and finally coat with a threaded coupling assembly as a whole. Similarly, when working for some time after the bearing wear, but also just appropriate to reduce the thickness of the shims can easily eliminate bad clearance, to restore the original accuracy. To achieve the purpose of repairing.
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