Dynamic model and load sharing performance of planetary gear system with journal bearing

2020 ◽  
Vol 151 ◽  
pp. 103898 ◽  
Author(s):  
Chunpeng Zhang ◽  
Jing Wei ◽  
Feiming Wang ◽  
Shaoshuai Hou ◽  
Aiqiang Zhang ◽  
...  
Keyword(s):  
Dynamic Model ◽  
Journal Bearing ◽  
Planetary Gear ◽  
Load Sharing ◽  
Gear System ◽  
Planetary Gear System

Torsional Vibrations and Dynamic Loads in a Basic Planetary Gear System

1986 ◽  
Vol 108 (3) ◽  
pp. 348-353 ◽  
Author(s):  
R. August ◽  
R. Kasuba
Keyword(s):  
Dynamic Model ◽  
Degrees Of Freedom ◽  
Planetary Gear ◽  
Gear System ◽  
Dynamic Loads ◽  
Ring Gear ◽  
Gear Mesh ◽  
Input And Output ◽  
Planetary Gear System ◽  
Three Degrees Of Freedom

An interative method has been developed for analyzing dynamic loads in a light weight basic planetary gear system. The effects of fixed, semi-floating, and fully-floating sun gear conditions have been emphasized. The load dependent variable gear mesh stiffnesses were incorporated into a practical torsional dynamic model of a planetary gear system. The dynamic model consists of input and output units, shafts, and a planetary train. In this model, the sun gear has three degrees of freedom; two transverse and one rotational. The planets, ring gear, and the input and output units have one degree of freedom, (rotation) thus giving a total of nine degrees of freedoms for the basic system. The ring gear has a continuous radial support. The results indicate that the fixed sun gear arrangement with accurate or errorless gearing offers in general better performance than the floating sun gear system.

Static Load Sharing in Power-Split Planetary Gear Trains

2011 ◽  
Vol 86 ◽  
pp. 725-729
Author(s):  
Yang Li ◽  
Geng Liu ◽  
Guang Lei Liu
Keyword(s):  
Static Load ◽  
Planetary Gear ◽  
Load Sharing ◽  
Power Input ◽  
Gear System ◽  
Output Stage ◽  
Planetary Gear Trains ◽  
Power Split ◽  
Gear Trains ◽  
Planetary Gear System

Based on analyzing the mechanism of load sharing of power-split planetary gear trains, equivalent mesh errors are defined and introduced in this paper to take the deformations and manufacturing and assembling errors into account. The static equilibrium equation of planetary gear trains is established. Then the load sharing coefficients of a power-split planetary gear system are calculated. The results indicate that the load sharing of power input stage is worse than that of the power output stage in the power-split planetary gear system.

An analytical method to calculate misalignment in the journal bearing of a planetary gear system

Wear ◽  
1980 ◽  
Vol 61 (1) ◽  
pp. 143-156 ◽  
Author(s):  
Pralay Kumar Das ◽  
Shiam Sunder Gupta
Keyword(s):  
Analytical Method ◽  
Journal Bearing ◽  
Planetary Gear ◽  
Gear System ◽  
Planetary Gear System

Load Sharing Performance of Herringbone Planetary Gear System with Flexible Pin

2019 ◽  
Vol 20 (12) ◽  
pp. 2155-2169 ◽  
Author(s):  
Chang-lu Wang ◽  
Jing Wei ◽  
Zi-heng Wu ◽  
Long Lu ◽  
Hao Gao
Keyword(s):  
Planetary Gear ◽  
Load Sharing ◽  
Gear System ◽  
Planetary Gear System

Study of Dynamic Model of Helical/Herringbone Planetary Gear System With Friction Excitation

2018 ◽  
Vol 13 (12) ◽  
Author(s):  
Shaoshuai Hou ◽  
Jing Wei ◽  
Aiqiang Zhang ◽  
Teik C. Lim ◽  
Chunpeng Zhang
Keyword(s):  
Dynamic Response ◽  
Dynamic Model ◽  
Great Influence ◽  
Elastohydrodynamic Lubrication ◽  
Planetary Gear ◽  
Gear System ◽  
Frictional Torque ◽  
Vibration Acceleration ◽  
Tooth Surfaces ◽  
Planetary Gear System

Tooth friction is unavoidable and changes periodically in gear engagement. Friction excitation is an important excitation source of a gear transmission system. They are different than the friction coefficients of any two points on the same contact line of a helical/herringbone gear. In order to obtain the influence of the friction excitation on the dynamic response of a helical/herringbone planetary gear system, a method that uses piecewise solution and then summing them to analyze the friction force and frictional torque of tooth surfaces is proposed. Then, the friction coefficient is obtained based on the mixed elastohydrodynamic lubrication (EHL) theory. A dynamic model of a herringbone planetary gear system is established considering the friction, mesh stiffness, and meshing error excitation by the node finite element method. The influence of friction excitation on the dynamic response of the herringbone planetary gear is studied under different working conditions. The results show that friction excitation has a great influence on the vibration acceleration of the sun and planetary gear. However, the effect on the radial and tangential vibration acceleration of a planetary gear is the opposite. In addition, the friction excitation has a slight effect on the meshing force.

scholarly journals Effect of the radial support stiffness of the ring gear on the vibrations for a planetary gear system

2019 ◽  
Vol 39 (4) ◽  
pp. 1024-1038 ◽  
Author(s):  
Hongwu Li ◽  
Jing Liu ◽  
Jinlei Ma ◽  
Yimin Shao
Keyword(s):  
Dynamic Model ◽  
Planetary Gear ◽  
Peak Frequency ◽  
Gear System ◽  
Ring Gear ◽  
Planetary Gear System ◽  
Critical Components ◽  
The Time Domain ◽  
Multi Body ◽  
Body Dynamic

Planter gear system is one of the critical components of various industrial transmission systems. In general, the ring gear is elastically fixed with the gearbox. The gearbox materials and their assembly relationships will affect the support stiffness of the ring gear and system vibrations. In this paper, a multi-body dynamic model for a planetary gear system with the elastic support of ring gear is developed to discuss the influence of the radial support stiffness of ring gear on the system vibrations. The planet bearings are also considered in the multi-body dynamic model. The rotational speed of the planet gear and carrier from the simulation and theoretical results are compared to validate the developed multi-body dynamic model. The influences of the radial support stiffness of the ring gear, carrier moment, and sun gear speed on the time- and frequency-domain vibrations of the planetary gear system are analyzed. The results denote that the waveform and amplitude of the time-domain vibration of the ring gear are greatly affected by the radial support stiffness of ring gear as well as the peak frequency amplitude and its sidebands. The peak frequency in the spectrum of ring gear is slightly affected by the radial support stiffness. It indicates that this study can give some guidance for the vibration control approaches for the planetary gear systems.

Dynamical load sharing behaviors of heavy load planetary gear system with multi-floating components

2018 ◽  
Vol 09 (01) ◽  
pp. 1850005 ◽  
Author(s):  
Xiangyang Xu ◽  
Tianhong Luo ◽  
Jiayuan Luo ◽  
Xia Hua ◽  
Reza Langari
Keyword(s):  
Planetary Gear ◽  
Load Sharing ◽  
External Input ◽  
Gear System ◽  
Central Component ◽  
Heavy Load ◽  
Position Errors ◽  
Planet Gear ◽  
Planetary Gear System ◽  
Input Load

To investigate the dynamical load sharing behaviors of multi-floating components in the heavy load planetary gear system, a multi-floating planetary gear system that includes a floating central component and a quasi-floating planet flexible supporting pin is employed. Then a 21 degree of freedom lumped parameters dynamical model of this system is presented to study the dynamical load sharing behaviors. Some influencing factors, such as supporting stiffness, positions error of sun or carrier, and external input load are analyzed on the dynamical load sharing of the planetary gear system with multi-floating components. The results demonstrate that the load sharing condition of the system is best when both the sun gear and planet gears are multi-floating at the same time. When the planet gear position errors remain constant, reducing the flexible pin stiffness of planet gear or increasing external input load can effectively improve the load sharing. These conclusions are verified by the relevant experiments.

Dynamic Load Sharing Characteristic of Planetary Gear System with Load Balancing Mechanism

2010 ◽  
Vol 97-101 ◽  
pp. 3504-3508
Author(s):  
Jian Xing Zhou ◽  
Geng Liu ◽  
Shang Jun Ma
Keyword(s):  
Load Balancing ◽  
Dynamic Load ◽  
Time History ◽  
Planetary Gear ◽  
Load Sharing ◽  
Differential Method ◽  
Gear System ◽  
Nonlinear Dynamic Model ◽  
Planetary Gear System ◽  
Dynamic Load Sharing

The dynamic load sharing characteristic of the 2K-H-type planetary gear system with floating center gear is researched in consideration of the manufacturing errors, assembly errors, time-varying mesh stiffness. The nonlinear dynamic model is set up and solved by using Newmark’s method. Then the time history of load sharing factor of the system with load balancing mechanism are obtained, and the effects of the floating clearance， the load torque, and the way of planetary gears assembled on load sharing factor are researched. The sensitivity analysis of load sharing factor is done by using finite differential method. The study provides useful theoretical guideline to the design of planetary gear system.

Sign in / Sign up

Export Citation Format

Share Document