Load-Sharing Characteristics of Power-Split Transmission System Based on Deformation Compatibility and Loaded Tooth Contact Analysis

Hao, Dong; Duan, Ling-ling; Zhang, Junan; Zhou, Fang

doi:10.1155/2015/305808

Cited by 7 publications

(7 citation statements)

References 11 publications

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“…Given the bending rigidity Kw of spline shaft is 1.78 3 10 7 NÁm 21 and the bearing support stiffness of the sun gear K i is 5.5 3 10 8 NÁm 21 . The solution of time-varying meshing stiffness is carried out according to reference [6]. LTCA method is used to calculate the time-varying meshing stiffness, LTCA model of driving gear and driven gear is shown in Figure 6.…”

Section: Load-sharing Coefficient Calculationmentioning

confidence: 99%

“…1,2 It also has the same advantages of high bearing capacity, high power density, large transmission ratio, high torque, compact structure as the parallel-shaft cylindrical gear transmission. 3,4 The system used the face-gear transmission characteristics and adopt the multi-branching load-sharing technology 5,6 to meet the requirements of high speed and heavy-load, which can be promoted and applied in aviation, wind power, mining machinery, and other related fields.…”

Section: Introductionmentioning

confidence: 99%

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

Hao

Zhang

Zhao

et al. 2021

Advances in Mechanical Engineering

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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.

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Section: Load-sharing Coefficient Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Hao

Zhang

Zhao

et al. 2021

Advances in Mechanical Engineering

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“…Kahraman et al studied statics load sharing characteristic of the planetary transmission systems [1][2][3][4]; Singh established analysis model of the load sharing characteristic of the planetary transmission systems [5,6]; Wink and Sepra studied the method of tooth surface load distribution [7]; Bao et al studied the static load sharing characteristics of star gear and closed differential transmission systems [8,9]; Du et al studied the load sharing characteristics of the planetary transmission systems and dual power splitting systems [10,11]; and Mo et al researched the natural characteristics of double-helical star gearing system for GTF aeroengine and load sharing behavior of wind turbine gearbox [12][13][14][15]; Mantriota deals with the performance of power split transmissions in wind energy systems to identify the power split configurations that require the minimum rated power of the regulator system, to reduce costs and the power losses [16]. Zhu et al established a dynamic analysis model for 2-stage star gear train, where in the transmission error and the time-varying stiffness and backlash the nonlinear differential equations with multiple backlashes were considered and solved [17].…”

Section: Prefacementioning

confidence: 99%

Research on Multiple‐Split Load Sharing Characteristics of 2‐Stage External Meshing Star Gear System in Consideration of Displacement Compatibility

Jin

et al. 2017

Mathematical Problems in Engineering

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This paper studies the multiple-split load sharing mechanism of gears in two-stage external meshing planetary transmission system of aeroengine. According to the eccentric error, gear tooth thickness error, pitch error, installation error, and bearing manufacturing error, we performed the meshing error analysis of equivalent angles, respectively, and we also considered the floating meshing error caused by the variation of the meshing backlash, which is from the floating of all gears at the same time. Finally, we obtained the comprehensive angle meshing error of the two-stage meshing line, established a refined mathematical computational model of 2-stage external 3-split loading sharing coefficient in consideration of displacement compatibility, got the regular curves of the load sharing coefficient and load sharing characteristic curve of full floating multiple-split and multiple-stage system, and took the variation law of the floating track and the floating quantity of the center wheel. These provide a scientific theory to determine the load sharing coefficient, reasonable load distribution, and control tolerances in aviation design and manufacturing. PrefaceTwo-stage external meshing planetary transmission system is widely used in aviation and special precision transmission field. The T53-L-11 turbo-axis aircraft engine produced by Lycoming (US Company) used two-stage external meshing planetary transmission system as its reducer. Located in the engine head and installed in the intake box, reducer transports the motivation from free turbine shaft to the second sun gear after decreasing speed and increasing torque. Two-stage star gear transmission has multiple duplicate gears with fixedaxes to share the load, its star gears do not revolve, and its characteristics are power split, high transmission power, and only one-side load bearing, and so on. Two-stage star gear transmission uses two-stage star gears, without the ring gear, directly output by two external gears, so that it overcomes the alternating load of planet gear in traditional planetary gear transmission, the difficulty in processing of ring gear, the centrifugal force caused by the rotation of carrier, and intermittent lubrication of planet gear. The system strength, stiffness, and working life and reliability of transmission system have greatly improved by using two-stage fixed-axis external meshing gears. In this paper, a precise load sharing characteristic analysis model is established for all gears with angular displacement compatibility, including bearing manufacturing errors, gear manufacturing errors (eccentricity error, tooth thickness error, and pitch error), installation error, and the meshing error caused by the variation of the meshing backlash resulting from simultaneous floating of all the gears. Research results can be used for aircraft engine and other precision special transmission systems in load sharing coefficients determination, vibration noise reduction, structure optimization, and error precision control. This paper provides sci...

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“…Du et al [2] studied the load sharing behavior of planetary train based on deformation compatibility. Dong et al [3,4] studied the load sharing characteristics of two-branching power split system based on deflection compatibility and clearance floating. Guo et al [5] studied load sharing of wind turbine planetary gear drivetrains subjected to non-torque loads.…”

Section: Introductionmentioning

confidence: 99%

Research on static load sharing characteristics of power split two-stage five-branching star gearing drive system

Hao¹,

Liu²,

Zhao³

et al. 2019

J. vibroeng.

Self Cite

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Power split two-stage five-branching star gearing drive system has been widely used in the aviation engine reducer and the helicopter's main reducer. For the problem of load sharing characteristics of this system, a static load-sharing calculation model is established. According to the power flow closed loop characteristics of the whole system, the torque equilibrium condition and deformation compatibility condition of the system are established. The load sharing coefficient of the star gears and the system is calculated by using the principle of the integrated equivalent mesh error and the static equilibrium condition of the floating element. Further, the influence of manufacturing error, installation error and floating on load sharing coefficient is analyzed. When the load sharing characteristic is independently influenced by the error, the load sharing coefficient of each star gear changes periodically with time. Basic component floating can significantly improve the load sharing performance. The correctness of the theoretical algorithm is verified by experiments. A new algorithm is proposed for engineering application.

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Load-Sharing Characteristics of Power-Split Transmission System Based on Deformation Compatibility and Loaded Tooth Contact Analysis

Cited by 7 publications

References 11 publications

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

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

Research on Multiple‐Split Load Sharing Characteristics of 2‐Stage External Meshing Star Gear System in Consideration of Displacement Compatibility

Research on static load sharing characteristics of power split two-stage five-branching star gearing drive system

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