Abstract
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.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- D w :
-
Rolling body diameter
- d i :
-
Diameter of the bottom of the inner channel groove
- d o :
-
Diameter of the bottom of the outer trench channel
- d m :
-
Section circle diameter
- E :
-
Material modulus of elasticity
- F ij :
-
Rolling body and inner raceway contact force
- F oj :
-
Rolling body and outer raceway contact force
- F n ( j , j −1) :
-
Collision force between the rolling body and the previous rolling body
- F n ( j , j + 1) :
-
Collision force between the rolling body and the following rolling body
- F r :
-
Radial load
- F c :
-
Rolling body centrifugal force
- J n :
-
Moment of inertia of the rolling body with respect to the center of mass
- K b :
-
Contact stiffness between rolling bodies
- K ij :
-
Contact stiffness of rolling body and inner raceway
- K oj :
-
Contact stiffness of rolling body and outer raceway
- m b :
-
Rolling body mass
- m i :
-
Inner ring quality
- n :
-
Inner ring speed
- r bj :
-
Rolling body radial displacement
- r i :
-
Radial displacement of inner ring center
- S ij :
-
Slip-roll ratio of rolling body to inner raceway
- S oj :
-
Slip-roll ratio of rolling body to outer raceway
- T p :
-
Friction between rolling bodies
- T ij :
-
Rolling body and inner raceway drag force
- T oj :
-
Rolling body and outer raceway drag force
- Z :
-
Number of rolling bodies
- δ :
-
Collision contact deformation between rolling bodies
- δ ij :
-
Rolling body and inner raceway contact elastic deformation
- δ oj :
-
Rolling body and outer raceway contact elastic deformation
- δ in :
-
Rolling body and inner ring relative displacement
- δ out :
-
Rolling body and outer ring relative displacement
- θ x :
-
Circumferential span angle
- θ oz :
-
Axial span angle
- θ j :
-
Rolling body self-turning angle position
- μ ij :
-
Rolling body and inner raceway drag coefficient
- μ oj :
-
Rolling body and outer raceway drag coefficient
- ρ :
-
Material Density
- υ :
-
Material Poisson's ratio
- φ j :
-
Rolling body angle position
- ω bj :
-
Rolling body rotation angular velocity
- ω cj :
-
Angular velocity of rolling body rotation
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Acknowledgements
The author thanks the National Natural Science Foundation of China for its support for the project. This work was supported by the National Natural Science Foundation of China (Grant No. 51375125).
Funding
Professor Yuan Zhang has National Natural Science Foundation of China (51375125).
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Zhang, J., Zhang, Y., Zhou, E. et al. Research on multi-body dynamic model of automatic discrete system for protection bearing without cage. Nonlinear Dyn 111, 20869–20897 (2023). https://doi.org/10.1007/s11071-023-08904-x
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DOI: https://doi.org/10.1007/s11071-023-08904-x