Measurement and Some Discussions on Dynamic Load Sharing in Planetary Gears

Hayashi, Teru; Li, Xie Yuan; Hayashi, Iwao; Endo, Kinichi; Watanabe, Wataru

doi:10.1299/jsme1958.29.2290

Cited by 42 publications

(12 citation statements)

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“…This unequal load sharing was not significant when the mesh frequency was lower than 1000 Hz. Hayashi et al . developed a method to measure planet gear shearing stress and studied the influences of gear tooth profile error and eccentricity on load sharing.…”

Section: Introductionmentioning

confidence: 99%

“…Over 90% of the time, this wind turbine operated below rated torque and the majority of the time it operated below 40% torque. In these conditions, the pitching moment had the same order of magnitude as the input torque . Prior research into gear and bearing loads at low‐input torque has received little attention and did not consider the effect of pitching moments.…”

Section: Introductionmentioning

confidence: 99%

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Planetary gear load sharing of wind turbine drivetrains subjected to non‐torque loads

2014

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An analytical formulation was developed to estimate the load-sharing and planetary loads of a three-point suspension wind turbine drivetrain considering the effects of non-torque loads, gravity and bearing clearance. A three-dimensional dynamic drivetrain model that includes mesh stiffness variation, tooth modifications and gearbox housing flexibility was also established to investigate gear tooth load distribution and non-linear tooth and bearing contact of the planetary gears. These models were validated with experimental data from the National Renewable Energy Laboratory's Gearbox Reliability Collaborative. Non-torque loads and gravity induce fundamental excitations in the rotating carrier frame, which can increase gearbox loads and disturb load sharing. Clearance in the carrier bearings reduces the bearing stiffness significantly. This increases the amount of pitching moment transmitted from the rotor to the gear meshes and disturbs the planetary load share, thereby resulting in edge loading. Edge loading increases the likelihood of tooth pitting and planet-bearing fatigue, leading to reduced gearbox life. Additionally, at low-input torque, the planet-bearing loads are often less than the minimum recommended load and thus susceptible to skidding.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Planetary gear load sharing of wind turbine drivetrains subjected to non‐torque loads

2014

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“…Similar studies by others (6) - (9) reinforce the importance of the gear support (piloting) conditions on planet load sharing. Hayashi et al (10) performed an experimental study to demonstrate that load sharing improves with the increase in torque.…”

Section: Introductionmentioning

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

166

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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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“…Figures 5-7 demonstrate that the unevenness of load sharing among the planet gears of the PGS decreased with decreasing pinhole position error and increasing input torque (Hidaka et al, 1979a(Hidaka et al, , 1979bHayashi et al, 1986). In addition, at small input torques, pinhole position error was the dominant determinant of load sharing among the gears.…”

Section: Analysis Of Load Sharing With Respect To Pinhole Position Ermentioning

confidence: 96%

Characteristic Analysis of Planetary Gear Set of Hydromechanical Transmission System of Agricultural Tractors

Park¹,

Kim²,

Lee³

2016

Journal of Biosystems Engineering

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Purpose: This study aims to establish the effect of pinhole position errors in the planet carrier of a planetary gear set (PGS) on load sharing among the planet gears in the hydromechanical transmission (HMT) system of an agricultural tractor. Methods: A simulation model of a PGS with five planet gears was developed to analyze load sharing among the planet gears. The simulation model was verified by comparing its results with those of a model developed in a previous study. The verified simulation model was used to analyze the load-sharing characteristics of the planet gears with respect to the pinhole position error and the input torque to the PGS. Results: Both simulation models had identical load magnitude sequences for the five planet gears. However, the load magnitudes on the corresponding planet gears differed between the models because of the different stiffnesses of the PGS components and the input torques to the PGS. The verified simulation model demonstrated that the evenness of load sharing among the planet gears increases with decreasing pinhole position error and increasing input torque. Conclusions: The geometrical tolerance of the pinhole position should be properly considered during the design of the planet carrier to improve the service life of the PGS and load sharing among the planet gears.

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Measurement and Some Discussions on Dynamic Load Sharing in Planetary Gears

Cited by 42 publications

References 0 publications

Planetary gear load sharing of wind turbine drivetrains subjected to non‐torque loads

Planetary gear load sharing of wind turbine drivetrains subjected to non‐torque loads

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

Characteristic Analysis of Planetary Gear Set of Hydromechanical Transmission System of Agricultural Tractors

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