| The main function of motor bearings is to support and reduce friction,vigorously develop low noise,high quality bearings,is one of the current strategic objectives of bearing industry in China,bearing noise reduction technology is one of the key points.And with the improvement of the energy saving and vibration reduction requirements of the motor,the comprehensive performance requirements of the supporting bearings with vibration value and noise as the core to achieve a new higher level,so ranked "the 12 th Five-Year" bearing industry development planning national bearing key projects.This paper summarized and analyzed the annual output,failure ratio and vibration failure form of medium and large cylindrical motor bearings in a well-known bearing manufacturing enterprise in China from 2013 to 2015.Determine to take a large cylinder motor bearing as the research object,take the roller chamfer,inner ring slope angle,outer rib structure design,rollers droop amount control,reasonable clearance calculation and selection,cage structure optimization,totally six aspects to research and improve.With improvement of structural optimization,to improve the performance of bearing internal performance,to achieve the ideal purpose of use.The ROMAX software is used to conduct three-dimensional modeling and analysis of the bearing,so as to obtain the bearing load distribution under fatigue load,the contact stress distribution curve between the roller and the raceway,judge the peak value and position of the contact stress,and ensure the safety and reliability of the design through analysis.The modal analysis of bearing retainers was carried out with Ansys software to obtain the vibration characteristics of three different types of retainers.In the process of product processing,the precision control and balance detection of the retainer are respectively adopted,and effective measures are taken to control various excessive ripple degrees in different processes of the ring.At the same time,the reliability and vibration characteristics of the designed product are verified through the service life and vibration test of the product.Through structural design improvement,theoretical analysis,process control and experimental verification,it is concluded that: 1)the product chamfer optimization,the inner ring slope angle optimization and the roller droop amount control can obviously eliminate the problem of installation injury and the vibration sound difference caused by it,and improve the reliability of the product;2)the reasonable selection of clearance and optimization of retaining structure design improve the bearing motion characteristics and play a role in vibration and noise reduction.3)the test structure shows that the designed product meets the requirements of actual working conditions by analyzing the life and force of the bearing and taking corresponding test verification.4)through the mode analysis and test verification of the cage,the integrated external guide structure cage has obvious effect in shock absorption and noise reduction,square head rivet structure is the second,and rivet structure is the worst.In the case that the ring and the rolling body are controlled according to the existing standards,the optimization of the cage structure can significantly reduce the vibration value and increase the d B value 5-10,it’s a very obvious effect.5)by testing the balance of the cage,the precision characteristics of the cage can be confirmed,and the operation characteristics of the product can be effectively improved.The vibration value of 1-5 db can be effectively reduced by controlling the out-of-specification range in the process of machining,heat treatment and grinding. |
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