| As an important mechanical foundation part,deep groove ball bearing is the most widely used type of rolling bearing.The internal contact form of deep groove ball bearing is point contact.The main reason for its failure is that during the operation of the bearing,the steel ball is subjected to external alternating load for a long time.The contact point is relatively fixed on the surface of the steel ball.The wear of steel ball is intensified and the wear area is concentrated,which has a great influence on the life of the bearing.Therefore,this paper proposes a V-shaped inner ring full-surface contact ball bearing.The inner ring is composed of an asymmetric cone with a certain angle between the two axes and the rotary axis.By changing the motion state of the steel ball,the contact points on the surface of the steel ball are distributed on the whole surface of the steel ball,so as to improve the bearing life.First,design the full surface contact ball bearing structure of the V-shaped inner ring,analyze the influence of the V-shaped inner ring on the motion of the steel ball,and conduct a kinematic analysis of the steel ball without considering the slippage,and establish the steel ball and the inner and outer rings.The trajectory equation of the contact point and the motion equation of the steel ball determine the structural parameters of the V-shaped inner ring that affect the motion of the steel ball.In order to prevent the steel ball from sliding,the dynamic equations of the steel ball are established on the axial section and the radial section respectively,and the critical conditions for the steel ball to not slip are analyzed.Under the condition of no slippage,the trajectory equation of the contact point on the surface of the steel ball is established,and the influence of the structural parameters and speed on the trajectory of the contact point is analyzed.Then,20 kinds of V-shaped inner ring structure schemes are designed and the corresponding three-dimensional assembly models and loading parts are established.The 20 kinds of schemes are simulated and analyzed in the ADAMS dynamic analysis software,and the steel ball is obtained by post-processing the simulation results.The self-rotation angle curve,the coordinate value curve of the marking point and the center-of-mass displacement curve under the load condition are analyzed and evaluated according to the post-processing results to verify the feasibility of the bearing and the correctness of the theory,and compare the comprehensive selection of the simulation results A best plan is developed as the basis for subsequent analysis and processing of test pieces.Finally,according to Hertz contact theory,the contact stress theory of the selected scheme is analyzed,and it is verified that the improved bearing meets the allowable contact stress of the material under the rated static load.The bearing is jointly simulated by Hyper Mesh and Ansys,which is compared with the theoretical results.The V-shaped inner ring is processed by 3D printing and tested on the bearing operation test-bed.The rationality of the V-shaped inner ring is verified by comparing the peeling state of the fluorescent paint on the steel ball surface before and after the test;Finally,the bearing temperature test-bed is built to verify the working stability of the bearing through the temperature test.This paper designed a V-shaped inner ring full surface contact ball bearing.By changing the motion mode of the steel ball,the contact points on the surface of the steel ball are distributed on the whole surface of the steel ball,which is of certain significance to improve the service life of the bearing. |
