Dynamic characterization of a new type of planetary slewing bearing

DOI:	10.11809/bqzbgcxb2024.09.030
Keywords:	slewing bearing; planetary gears; multibody dynamic; contact dynamic; quasi static model
Abstract:	The traditional single toothed wheel type slewing bearing has the problems of partial load, low transmission precision, and abnormal wear, which cannot meet the requirements of high load equipment such as tanks and artillery systems for the slewing bearing with high precision and long service life. Combining the characteristics of planetary transmission and slewing bearing, a new type of planetary slewing bearing is designed, and the mechanical performance research and theoretical verification are carried out. Based on the Hertz contact theory, the mechanical equilibrium equation of the slewing bearing under pure axial load is deduced by considering the coupling effect of contact elastic deformation and actual contact angle. Considering the coupling effect of tilting angle and radial displacement, the mechanical model of the slewing bearing under combined load is established, and the precise contact angle, maximum load and load distribution law of the slewing bearing are numerically calculated by using the Newton Raphson iterative method. Using ADAMS simulation platform, the multi body contact dynamics simulation models of slewing bearings, single toothed wheel slewing bearings and new planetary slewing bearings were established by considering the four point dynamic contact action of steel balls and raceways and dynamic meshing action of gear teeth, and the dynamic characteristics and vibration responses of the three models, such as dynamic meshing force, dynamic contact force and vibration displacement, were calculated and analyzed. The results show that the simulation results of the contact angle and load distribution law of the slewing bearing are in good agreement with the accurate theoretical results. The developed new planetary slewing bearing presents balanced symmetry and even load distribution of periodic meshing force and bearing internal contact force, eliminates the meshing impact and partial load phenomenon of single tooth wheel slewing bearing, significantly reduces the wheel tooth meshing force, bearing internal load and system vibration response, and improves the transmission mechanical performance and smoothness of motion of planetary slewing bearing. The proposed new scheme and dynamic model provide theoretical guidance for the research and development of new type of slewing bearing products for high performance military equipment and their dynamic design.
Published:	2024-09-30
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