Improved Trial Production And Friction Torque Test Of Curved-groove Ball Bearings

In chinese traditional agriculture,The major agricultural products such as wheat,rice,corn,and so on,it should be involved threshing or defibering system in the processing of these agricultural products.But the traditional threshing or defibering system achieve the function of kneading and rolling is the joint action of eccentric wheel and rolling bearing,this resulted in complex structure and inefficient of the traditional equipment.In order to solve the problem,a "S" circular arc raceway in three dimensional space instead of plane circular arc raceway of traditional bearing outer ring.The new structure bearing can not realize the rotary motion,but also can carry out the axial reciprocating motion,It has important significance to simplify the structure and improve the efficiency of such machines.(1)The previous design scheme of the curved-groove ball bearing,this study combined with the actual production to improve it,the plane annular raceway of the bearing inner ring is changed into a uniformly distributed spherical cavity,in order to let the rolling body is rolling friction,adding a large number of small ball in the spherical caity.Combined with actual demand and processing conditions,The double "S" curve ring raceway in the outer ring is changed into a single "S" curve raceway,cycles are changed from 13 to 7.The process of trial manufacture,heat treatment,precision machining and assembly of bearing parts are completed in this study.(2)In order to study the axial load,the number of small ball and rolling body diamete influence on friction torque of the curved-groove ball bearings,this study chose the equilibrium moment methed as the design basis of bearing friction torque tester.In combination with the structural characteristics of the bearings,technical requirements and measurement indicators,the structure design of the bearings friction torque tester is completed,motor type,type of Retarder,core components and loading scheme are determined.(3)According to overall design scheme of the bearings friction torque tester,Using Pro/E to complete the three-dimensional modeling and virtual assembly,to start the parts purchasing,parts processing and general assembly after interference test.After the completion of the whole assembly,the data acquisition system is built and the related debugging work is done.(4)With the self-made friction torque tester and data acquisition system,the test of the influence of axial load,the number of small ball and rolling body diamete on the friction torque of curved-groove ball bearing is completed.The research draws the following conclusions: the friction torque increases with the increase of axial load;the friction torque increases first and then decreases with the increase of the quantity,when the small ball number is 80~100,the friction torque reaches a small value;within the 8~10mm range,the friction torque increases with the increase of the ball diameter.Optimal design and machining assembly of the curved-groove ball bearings are completed in this study,the design of friction torque tester and the test of friction torque are also studied,The above conclusions provide the basis for the performance improvement of the curved-groove ball bearing structure.