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How to describe the gap rolling ball bearing
Source: China Bearing Network Time: 2014-10-17
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Rolling ball bearings are widely used in production and daytime due to their many advantages such as low frictional resistance, high starting efficiency, high efficiency, high rotation precision, smooth and simple, and convenient replacement. However, due to their high precision of production and process, the process is disordered. The standard rolling bearings are produced by special machines; they are produced by professional factories. Because the original parts are drawn between the inner ring, the outer ring and the rolling body of the bearing, there are few adjustable links; the important precision target diameter of the bearing The clearance is mainly ensured by mechanical machining. This way, even if a higher precision machine tool is used to machine the bearing parts; because of the inevitable heap error, it is difficult to use direct equipment to reach the demand. Accuracy. Usually must be selected by measurement; equipment is used by group equipment method; but the accuracy is limited; the price of high-precision bearings is high. The clearance caused by the wear of the bearing during use is also unsatisfactory; Its practice life is reduced; the formation of dross. Follow the development of production; urgent need to deal with this skill problem. To this end; the author has been analyzed And research; found the main factors that restrict the radial clearance accuracy of the bearing. Then proceed from the reasonable description of the layout of the bearing; draw a novel layout; make the radial clearance of the bearing can be easily adjusted; The above technical problems. After trial use; the effect is better;
1. Depicting the idea, operation principle and detailed layout are well known; it is necessary to adjust the radial clearance of the bearing; it is necessary to change the relative azimuth connection of the outer ring, the inner ring and the rolling body; the intuitive method is to make the outer diameter of the inner ring Or the inner diameter of the outer ring can be changed according to the requirements. For the ball bearing; there is a way to process the inner hole of the inner ring of the bearing into a certain taper; together with the corresponding journal, the corresponding taper is also processed. Adjusting the orientation of the inner ring on the shaft through additional equipment on the shaft; deforming the inner ring and then inducing the outer diameter to change; to adjust the clearance of the bearing. Public and private; this is a better method; it can be disposed of to a certain extent Difficulty; so it is still used today. But there are also several significant deficiencies; first, the amount of adjustment is limited (even very small); when there is a large gap, there is no power. Second, the journal needs to be machined with a higher precision taper; Additional conditioning equipment is required; the manufacturing process of the shaft is messy. Third, the inner ring receives a large amount of prestress; and it is a tensile stress in the circumferential direction; the bearing strength is extremely suffocating; sometimes the inner ring or even the adjustment will not break. ".by This can be seen; this traditional approach is not reasonable; there is a need for improvement.
Analysis of the bearing layout can be known; the inner ring is now a full article; there seems to be no potential to dig. The roll is "iron plate"; significant "unprofitable". Naturally; we turn our eyes to the outer ring Come up. But this part is really simple and simple; it can't be started with the usual idea; it is necessary to find another way. After meditation; ask for more; repeatedly scrutinize; finally realize it. Comprehend: change the radial travel of the bearing Gap; as if the military is the same; it is not only forced from the front (radial); it can also be taken from the side (axial). The condition is that it is necessary to break the bundle of traditional ideas and the confinement of the customary forces; Innovative. Therefore, the daring envisions the outer ring of the bearing to be cut along the cross section; it is divided into two (reverse thinking; simplification is complicated). The left and right halves can be moved relative to each other; then by the special inner ballway The interaction between the curved surface and the rolling body; the relative axial displacement of the outer ring is converted into the radial displacement of the rolling body; then the direct orientation of the radial orientation between the inner ring, the outer ring and the rolling body is received; The intention of the gap. Based on this; we can have the following skill plan: change the outer ring of the rolling bearing from the whole type to the axial split combination, with the double row rolling body, supplemented by the adjusting gasket group. Increase or decrease the thickness of the adjusting gasket to conveniently adjust the radial clearance of the bearing to the required value; finally, the outer joint of the outer casing is threaded. The same reason; when the bearing is worn for a period of time; The thickness; can eliminate the bad play at your fingertips; the original accuracy of rehabilitation. The intention of reaching the correction.
2, the characteristics of this depiction
(1) Simple processing: Because there is a central adjustable link; the processing scale of the part can be greatly relaxed; the scrap rate will also decrease exponentially. Together, the accuracy requirement for the machine tool can be reduced; It is possible to machine high-precision bearings on machine tools. The skill level of workers can also be appropriately reduced; it has certain economic benefits.
(2) Convenience of equipment and equipment: After the outer ring is made into a component type; it can conveniently adjust the radial clearance of the bearing to the ambition value; it can reach higher precision without using the grouping device method. The equipment on the shaft is also very Convenience; no additional adjustment equipment is added; the layout of the whole machine is simplified.
(3) Improve the force situation: the double-row rolling body can be used to increase the bearing capacity; and can accept the two-way axial force.
(4) Reducing the variety of parts: After the outer ring is made into the body type; the roll body can be covered on the fairway; this can save the cage. This can also reduce the process; improve the carrying capacity; it can be said that it is a multi-purpose. valve
(5) Protection and repair convenience: When the bearing is out of play due to wear and tear; only need to properly reduce the thickness of the adjusting gasket; the clearance can be reduced; the original accuracy of the rehabilitation; the service life of the bearing is extended accordingly. When only a single component is abnormally damaged; it is also possible to replace the damaged part to correct the bearing; or even to be old and new; it is a good way to overcome the problem. 1. 2 lack of
(1) The process of cutting the inner and outer threads on the outer ring is added. And because of the existence of the thread, the stress gathering is easy to occur; together, the heat 1P disposal becomes difficult.
(2) The axial dimension of the bearing is relatively large; and because of the randomness of the thickness of the adjusted gasket, there is a large shake.
(3) The outer ring needs to be thickened; the data consumption is increased.
The adjustable clearance rolling bearing analyzed here has the advantages of novel concept, reasonable layout, convenient equipment and easy repair. Especially after the outer ring of the bearing is changed from the whole type to the axial split type, the adjustment of the bearing clearance is made. The problem is easy to solve; it can be read by colleagues. This drawing can also be extended to other types of bearing depiction. The depiction is a non-standard bearing depiction. There are still many deep problems to be explored; the lack of need to be disposed of. Realistically hope to get the guidance and assistance of peer professors.
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