Effect of Internal Gear Flexibility on the Quasi-Static Behavior of a Planetary Gear Set

Kahraman, Ahmet; Vijayakar, Sandeep

doi:10.1115/1.1371477

Cited by 154 publications

(69 citation statements)

References 16 publications

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“…As the deformations of the gears and the carrier can change the planet load sharing drastically, use of a deformable body contact model like the ones published recently (13), (14) should be more suitable to study load sharing. Secondly, these studies investigated certain aspects of load sharing on a given planetary gear set.…”

Section: Scope and Objectivesmentioning

confidence: 99%

Influence of Carrier and Gear Manufacturing Errors on the Static Load Sharing Behavior of Planetary Gear Sets

Bodas

Kahraman

2004

JSME Int. J., Ser. C

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165

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In this paper, a state-of-the-art contact mechanics model of a planetary gear set is employed to study the effect of a number of manufacturing and assembly related carrier and gear errors on the load sharing amongst the planets. Three different groups of errors are considered: (i) time-invariant, assembly-independent errors such as carrier planet pinhole position errors, (ii) time-invariant, assembly-dependent errors such as planet tooth thickness errors, and (iii) time-varying, assembly-dependent errors such as gear run-out errors. With such errors present, planet load sharing characteristics of an n-planet system (n = 3 to 6) is investigated for different piloting configurations under quasi-static conditions. Load sharing behavior as a function of key manufacturing errors is quantified and design guidelines are proposed for better planet load sharing behavior.

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Section: Scope and Objectivesmentioning

confidence: 99%

Influence of Carrier and Gear Manufacturing Errors on the Static Load Sharing Behavior of Planetary Gear Sets

Bodas

Kahraman

2004

JSME Int. J., Ser. C

Self Cite

165

View full text Add to dashboard Cite

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“…Various reported works show the superior transmission efficiency of planetary gears, as well as their compactness compared with the more traditional drive trains. Epicyclic gears are also able to deliver a wider range of transmission ratios and are generally regarded to be quieter [7]. Thus, from design perspective it is important to develop analyses tools which combine the study of system dynamics and tribological efficiency of epicyclic gears, as well as their supporting bearings of their retaining shafts [8,9].…”

Section: Introductionmentioning

confidence: 99%

Dynamics and efficiency of planetary gear sets for hybrid powertrains

Mohammadpour

Theodossiades

Rahnejat

2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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The paper presents a tribo-dynamic model for planetary gear sets of Hybrid-Electric-Vehicle (HEV) configurations. The model comprises a 6 degree-of-freedom torsional multi-body dynamic system, as well as a tribological contact model in order to evaluate the lubricant film thickness, friction and efficiency of the meshing gear teeth contacts. The tribological model takes into account the non-Newtonian, thermal-mixed elastohydrodynamic regime of lubrication. Analysis is performed for a HEV C-segment vehicle. The simulated conditions correspond to cases of power supplied by either the engine or the electric motor. The results illustrate that in the electric motor drive mode, improved Noise, Vibration and Harshness (NVH) refinement would be expected, whereas better transmission efficiency is achieved in the internal combustion engine drive mode.

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“…The methods used by these research are classified into three main types: numerical analysis [10], finite element method [13,14], and experiment [11]. The influence factors considered in the works consist mainly of meshing stiffness [15], support stiffness [16], assembly error, eccentric error [3,11,12,[17][18][19], profile modification [9], floating component [5,17,20], flexible component [21,22], and so on.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Eccentric Error of Star Gear on the Bifurcation Properties of Herringbone Star Gear Transmission with Floating Sun Gear

Guo

Fang

Zhang

et al. 2018

Shock and Vibration

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Taking a herringbone star gear transmission (HSGT) with floating sun gear as an example, the system bifurcation characteristics with the changing of the eccentric error of star gear and the working frequencies are analyzed. For this analysis, a generalized dynamic model of HSGT considering the manufacturing eccentric errors, time-varying mesh stiffness, and load balancing mechanism is established and solved by numerical method. The floating process of sun gear is explained. In this paper, there are seven cases about the eccentric errors of star gears which are calculated, respectively. To study the effect of the working frequencies (including meshing frequency and rotation frequency), the calculation is done at three kinds of input speed in which the working frequencies are close to the system natural frequencies. The results are demonstrated in detail by the bifurcation diagrams, phase plane plots, and Poincare maps. The system bifurcation characteristics are particularly analyzed and compared in every case. This work provides important guidance to the engineering of HSGT.

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Effect of Internal Gear Flexibility on the Quasi-Static Behavior of a Planetary Gear Set

Cited by 154 publications

References 16 publications

Influence of Carrier and Gear Manufacturing Errors on the Static Load Sharing Behavior of Planetary Gear Sets

Influence of Carrier and Gear Manufacturing Errors on the Static Load Sharing Behavior of Planetary Gear Sets

Dynamics and efficiency of planetary gear sets for hybrid powertrains

Influence of the Eccentric Error of Star Gear on the Bifurcation Properties of Herringbone Star Gear Transmission with Floating Sun Gear

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