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Rolling friction ball bearings with 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 of high precision manufacturing , process complexity , the current standard of rolling bearings are used in jet production , by professional factory manufacturing. Since the original design between the bearing inner ring , outer ring, rolling elements , such as rigid parts rarely consider these adjustable links, so important indicator precision bearings - Radial clearance depends mainly on machining tolerances to be guaranteed. Thus , even with the high precision machining of the bearing to the machine parts , the method of the inevitable accumulation of error, and can also be difficult to achieve by direct assembly of the required accuracy . Generally required by measuring selected packet assembly method used to assemble , but still finite precision , so that the price of high precision bearings . While bearing the wear and tear caused by the use of ultra-poor clearance can not be compensated to reduce real life, resulting in waste. With the development of production, the urgent need to resolve the technical problems. To this end , the author through analysis and research, found the main factor restricting the precision of the bearing radial clearance . Then rational bearing structure design from start to design a novel structure, the bearing radial clearance can be easily adjusted to solve the above technical problems. After the trial , the effect is better now to make a brief introduction .
A design ideas, working principle and concrete structures
As we all know , to adjust the bearing radial clearance, must change the relative position of the outer ring , inner ring , rolling the three, intuitive approach is to make the inner ring of the outer or inner diameter of the outer ring can be varied as desired . Ball bearings , the processing method is to have a bore of the inner bearing ring into a taper , and cooperating with a corresponding spigot is machined taper . After assembly to change the position of the inner shaft through the attachment shaft, which leads to deformation of the inner race outside diameter , in order to adjust the bearing clearance. In all fairness , this is a better way to solve this problem to some extent , it followed so far. But there are a few obvious shortcomings , one limited adjustment amount ( even very small ) , clearance larger on powerless. Second, the journal to be processed at a higher precision taper and additional adjustment means to be provided , the axis of the manufacturing process complicated . The third is under a lot of inner prestressed , and for the circumferential tensile stress on the bearing strength is extremely unfavorable , sometimes even when adjusting the inner "no war since the break ." Thus, this 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 , seems to be no potential to be tapped . The rolling is " monolithic" obviously " unprofitable ." Naturally, we look up to the outer ring . But this part is really Jane and Jane, their conventional thinking can not start, must be another way . After wrestling , multi advice , repeated scrutiny, finally enlightened. Realized : change the bearing radial clearance, the same as if the war was not only forced the onslaught from the front ( radial ) , can also be taken from the side detour clever (axial ) . Prerequisite is to break the traditional thinking of bondage and imprisonment given potential force of habit , to dare to innovate. So bold vision along the outer ring of the bearing cross-section cut , split into two ( reverse thinking , simplify a complicated ) . So that the two halves can be relative axial movement by the interaction of specific surface and then rolling the inner ring of the ball track , the relative axial displacement into radial displacement of the outer ring of the rolling element , thereby indirectly change in the received the effect of radial position between the 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 replaced by the integral axial split combined with double rows of rolling elements , combined with adjusting shim pack. Increase or decrease in the assembly by adjusting shim thickness to easily adjust the bearing radial clearance to the desired value , and finally coat with a threaded coupling assembled into a whole . Similarly, when working for some time after bearing wear , but also just the appropriate adjustments to reduce the thickness of the gasket , you can easily eliminate bad clearance, to restore the original accuracy. Achieve the purpose of the repair of .
Needless to say , this is a new program , with originality , feasibility and practicality. Having a novel structure of a schematic bearing according to the above principles, and as illustrated in Figure 1 . 1 wherein , for the split outer ring member 4 , the member is formed with an outer thread on the member 4 is formed with an internal thread , each precision interworking . In order to ensure the strength of the outer ring and the locking screw adaptation needs should adopt a triangular fine thread , and appropriate to increase the thickness of the outer ring . 2 piece ball , double row arrangement, in the form of radial covered , but need to leave enough space between the ball , so the ball " too crowded " , each bearing friction reducing efficiency . 3 To adjust the shim set pieces , should be equipped with a variety of different thicknesses in order to select combinations. Conditions , it can be added in a daisy -like elastic spacer therein , effectively locking the screw . 5 pieces of the bearing inner ring , designed symmetrically on its outer fabric has a special curve sloping fairways, rolling to easy installation and adjustment of clearance from the role . In addition, each end face of the outer ring is also provided with a wrench four to six equispaced holes for inserting the special tool when the adjustment screw tightening . These simple structure, is not surprising. The key lies in the design of the fairway on the outer curve , is the key to success of , not be taken lightly . It is necessary to adjust the design to meet the basic requirements of clearance , but should be considered as the rated load , an important factor in the strength , fatigue life , processing technology and other contacts . Fortunately, there are many seniors have done a lot of these aspects in depth and fruitful research work , a lot of information , experience to draw on , so I benefited greatly in this smooth table thanks. Due to space limitations , here temporarily discussions.

2 design features
( 1 ) manufacturing is easy : Thanks to the adjustable intermediate links, so that part of the processing size tolerance band can be greatly relaxed , scrap rate also decreased exponentially . While reducing the accuracy of machine tools , the machining accuracy of machine tools in the general precision bearings possible. The technical level of the workers may be appropriate to reduce , with a certain economic benefits.
Convenient ( 2 ) assembling : the outer ring made ??after the split, you can easily adjust the radial bearing clearance to the ideal value , without using packet assembly method that can achieve high accuracy. Mounted on the shaft is also very easy to adjust without attaching other devices , simplifying the overall structure.
( 3 ) improve the situation by force : the use of double rows of rolling elements can increase the carrying capacity and can withstand axial forces .
( 4 ) reduce parts Category: outer ring made ??after the split , make rolling fairway covered , so the cage can be omitted . This while reducing processes, improve the carrying capacity , can be said to serve multiple purposes .
( 5 ) maintenance and repair easy : When the bearing clearance due to wear and tear caused by the ultra-poor , just appropriate to reduce the thickness of the shim adjustments , we can reduce the clearance, restore the original accuracy, correspondingly extended bearing life. In addition, when only the individual components of non-normal damage , but also used to replace the damaged parts of the ways to repair bearings, and even entire old as new , after all, a good way of reckoning.
3 point inadequacies
( A ) an increase in the outer ring of the inner cutting external thread step . Because of the thread and the stress concentration is easy to produce , while the heat treatment becomes difficult 1P .
Axial dimension ( 2 ) of the bearing is relatively large, and due to the random thickness of the adjustment washer with large fluctuations .
( 3 ) the outer ring to be thick , and the material consumption has increased.
Adjustable Rolling clearance presented here with the novel, reasonable structure, easy assembly , easy maintenance and so on . Especially after the outer ring of the bearing axial split integral to modular , so adjust the bearing clearance problem solved, available for peer reference . The design ideas can be extended to other types of bearings broaden designs. This design is non-standard bearing design . There are many issues still need to explore deeper , the inadequacies of the problems to be solved . Truly eager to get peer guidance and help .