scholarly journals Quasistatic Load Sharing Behaviours of Concentric Torque-Split Face Gear Transmission with Flexible Face Gear

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Ning Zhao ◽  
Wang Li ◽  
Tao Hu ◽  
Hui Guo ◽  
Ruchuan Zhou ◽  
...  
Keyword(s):  
Load Sharing ◽  
Spur Gear ◽  
Gear Transmission ◽  
Analysis Model ◽  
Face Gear ◽  
Speed Reduction ◽  
Hybrid Finite Element ◽  
Lumped Parameter ◽  
Large Speed ◽  
Split Face

The concentric torque-split face gear transmission is mainly developed for the rotorcraft which demands high power density and large speed reduction ratio. This paper aims at predicting the load sharing behaviours among paths. An original quasistatic load sharing analysis model, which is a hybrid finite element/lumped parameter quasistatic gear model, is presented. The connection between spur gear and face gear is also established. A number of numerical simulations of load sharing behaviour analysis are conducted. The mechanism of uneven load sharing is revealed. It is observed that the support stiffness of pinion and backlash have significant influences on the load sharing behaviours of the concentric torque-split face gear transmission.

Research on dynamic load sharing characteristics of double input face gear split-parallel transmission system

2021 ◽  
pp. 095440622110263
Author(s):  
Shuai Mo ◽  
Yuling Song ◽  
Zhiyou Feng ◽  
Wenhao Song ◽  
Maoxiang Hou
Keyword(s):  
Load Sharing ◽  
Transmission System ◽  
Torsional Stiffness ◽  
Research Trend ◽  
Face Gear ◽  
Parallel Transmission ◽  
Input Face ◽  
Lumped Parameter ◽  
The Face ◽  
Dynamic Load Sharing

The face gear power-split system has huge superiorities over the traditional transmission form in the application of modern rotorcraft, and it has become the research trend of the industry in recent years. Thus this paper took the double input face gear split-parallel transmission system used in the rotorcraft as the research target, and established its dynamics model through the lumped parameter theory. Based on the Newtonian second law, the dynamics equations were built and solved to gain the meshing forces and load sharing coefficients of the transmission system. Simultaneously, the impacts of the eccentric errors, support stiffness, and torsional stiffness on the load sharing characteristics were studied. The results show that the meshing forces and load sharing coefficients of each gear pair have periodic changes; the eccentric errors of each drive stage gear have only a significant effect on the corresponding drive stage. Moreover, the changes in the support stiffness of the split-torque shafts and double gear shafts mainly affect the load distribution of the parallel stage, and the shaft torsional stiffness is less sensitively to maintain load balance. In addition, the increment of the shaft stiffness increases the load sharing coefficients of the corresponding gear pairs.

scholarly journals Predictions of input pinion floating on concentric face gear transmission static load sharing

2019 ◽  
Vol 28 ◽  
pp. 236-240
Author(s):  
Zhengminqing Li ◽  
Si Li ◽  
Xin Tang ◽  
Wenlin Zhu ◽  
Meijun Liao
Keyword(s):  
Static Load ◽  
Load Sharing ◽  
Gear Transmission ◽  
Face Gear

scholarly journals Load-sharing analysis of two-stage three-branch star gearing based on deformation compatibility

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881954 ◽  
Author(s):  
Jinfu Du ◽  
Jin Mao ◽  
Kai Liu ◽  
Yahui Cui ◽  
Guorui Zhao
Keyword(s):  
Planetary Gear ◽  
Load Sharing ◽  
Gear Transmission ◽  
Analysis Model ◽  
Two Stage ◽  
Manufacturing Errors ◽  
Gear Manufacturing ◽  
Central Gear ◽  
Deformation Compatibility ◽  
Branch Star

A load-sharing analysis methodology was proposed for the multiple-branch star gear transmission which is composed of a number of closed-loop power flows. The moment equilibrium and deformation compatibility equations for the two-stage star gearing were derived, which are clearly different from that used in planetary gear transmission. Then the load-sharing analysis model was established and employed to systematically study the load-sharing behavior of the two-stage three-branch star gearing, some untouched aspects were investigated. Results show that the most sensitive directions of the central and star gear assembly errors on load-sharing are along the meshing line. The effects of the size and direction of the central gear–manufacturing errors on load sharing are the same for each branch, the initial directions of the central or a certain star gear–manufacturing errors will have no effect on the load-sharing coefficient of the system, but the initial directions of the assembly errors will. The conditions in which the load distribution curves repeat the first track were also obtained. Finally, a numerical example of a three-branch star gear aviation reducer was adopted to verify the feasibility of this proposed method, and the calculation results show good agreement with a previously published and validated model.

scholarly journals Study on the load-sharing characteristics of face-gear four-branching split-torque transmission system

2021 ◽  
Vol 13 (4) ◽  
pp. 168781402110099
Author(s):  
Dong Hao ◽  
Zhang Hao-qin ◽  
Zhao Xiao-long ◽  
Duan Ling-ling
Keyword(s):  
Load Sharing ◽  
Transmission System ◽  
Torsional Angle ◽  
Analysis Model ◽  
Radial Limit ◽  
Face Gear ◽  
Tooth Contact Analysis ◽  
Torque Transmission ◽  
Manufacturing Errors ◽  
Split Torque

In order to solve the load-sharing characteristics of face-gear four-branching split-torque transmission system (FGFBSTTS), the static load-sharing mechanical analysis model was established. In the model, the deformation coordination conditions of torsional angle and torque balance condition were considered. By using Loaded Tooth Contact Analysis (LTCA) technology of face gear and herringbone gear, the time-varying meshing stiffness was calculated. The influences of manufacturing errors, installation errors, I-stage pinion floating, II-stage pinion spline clearance floating, and radial limit ring clearance floating on the load-sharing characteristics are analyzed. The results show that the LTCA technology is more accurate to reflect the load-sharing characteristics of each meshing position. When the I-stage pinion and the II-stage pinion floated at the same time, the best load-sharing characteristics can be obtained. The load-sharing characteristics affected by manufacturing errors showed obvious periodic change. The radial limit ring plays a better auxiliary role in load-sharing characteristics. The theoretical results were compared with the experiments to verify the correctness of the theoretical analysis. The research results can provide a theoretical basis for the optimal design of the load-sharing structure, error control, and assembly of the face gear four branch transmission system.

The Engineering Design of Helical Spur Gear Transmission with Single Gear Pair for Electric Scooter

2015 ◽  
Vol 764-765 ◽  
pp. 374-378 ◽  
Author(s):  
Long Chang Hsieh ◽  
Tzu Hsia Chen ◽  
Hsiu Chen Tang
Keyword(s):  
Engineering Design ◽  
Spur Gear ◽  
Gear Transmission ◽  
Reduction Ratio ◽  
Gear Pair ◽  
Engineering Drawing ◽  
Electric Scooter ◽  
High Reduction ◽  
Cost Of Production ◽  
The Cost

Traditionally, the reduction ratio of a spur gear pair is limited to 4 ~ 7. For a spur gear transmission with reduction ratio more than 7, it is necessary to have more than two gear pairs. Consider the cost of production, this paper proposes a helical spur gear reducer with one gear pair having reduction ratio 19.25 to substitute the gear reducer with two gear pairs. Based on the involute theorem, the gear data of helical spur gear pair is obtained. According to the gear data, its corresponding engineering drawing is accomplished. This manuscript verify that one spur gear pair also can have high reduction ratio (20 ~ 30).

Analysis of Stochastic Nonlinear Dynamics in the Gear Transmission System with Backlash

2015 ◽  
Vol 16 (2) ◽  
pp. 111-121 ◽  
Author(s):  
Jingyue Wang ◽  
Haotian Wang ◽  
Lixin Guo
Keyword(s):  
Time Course ◽  
Damping Ratio ◽  
Excitation Frequency ◽  
Period Doubling ◽  
Spur Gear ◽  
Transmission System ◽  
Gear Transmission ◽  
Stochastic Dynamic ◽  
Random Disturbance ◽  
Gear Transmission System

AbstractIn order to study the different backlash, gear damping ratio and random disturbance on dynamic behavior of gear transmission system, stochastic dynamic equations of the three-degree-of-freedom spur gear transmission system are established considering random disturbances of a low-frequency external excitation induced by torque fluctuation, gear damping ratio, gear backlash, excitation frequency and meshing stiffness. Using bifurcation diagram, phase diagram, time course diagram, Poincaré map and power spectrum of the system, the dynamic characteristics of the gear transmission system with different backlash under gear damping ratio changing, and the influence of the random disturbance of gear damping ratio on the bifurcation characteristic of system are analyzed. Numerical simulation shows that the gear transmission system will be from periodic motion with a noisy disturbance to chaotic-like motion by period-doubling bifurcation with decreasing gear damping ratio. In the small damping ratio range, the backlash has great effect on the motion characteristics. Random disturbance has an important effect on the bifurcation characteristics.

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