Research on multi-body dynamic model of automatic discrete system for protection bearing without cage

Rolling bodies in cageless ball bearings without cage control will always hit each other. This causes the rolling bodies to wear out faster and decreases the bearing's performance. But most of the available references only look at how well the bearing works when the cage is in place. They do not look at how the inner ring's dynamic response changes when the cage is removed and the rolling elements' motion changes. On the basis of this, a nonlinear rolling-body dynamics model with six degrees of freedom and contact between rolling bodies is suggested. The dynamics model of an automatic discrete system is built on the motion coupling and functional slot discrete theories. The power hardware re-turn method is used to figure out how to solve the dynamics model. The results show that after the rotor falls into the inner ring, the rolling bodies will cause cumulative collision for a short time. Then, because of the function slot, the occasional collision between the rolling bodies would not cause cumulative collision again, and the inner ring motion will be more stable. When the speed of the rotor's fall goes up, the rolling bodies hit each other more often. This makes the inner ring move more steadily, but there is a limit. To make sure that the theoretical analysis and the results of the theoretical solution are right, a high-speed camera was used. To make sure that the theoretical analysis and the results of the theoretical solution are right, we built a bearing test platform to take pictures of the rolling body of the bearing as it moved. The image processing program is used to figure out the rolling body's angular speed, compare the test results to the theoretical study and make sure that the theoretical study is right. The theoretical study is compared to the test results to see if the theoretical study is right.