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Dynamic Analysis of Planetary Gear Transmission System Considering the Flexibility of Internal Ring Gear

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Iranian Journal of Science and Technology, Transactions of Mechanical Engineering Aims and scope Submit manuscript

Abstract

A rigid-flexible coupled dynamic model of the planetary gear transmission system was developed considering the flexibility of the internal ring gear (flexible internal ring gear) and the sun shaft based on the shell theory and Timoshenko beam theory, respectively. For the dynamic modeling, the time-varying meshing stiffness and static transmission error excitations were considered and the Runge–Kutta numerical algorithm was applied to calculate the dynamic response. The results indicate that the flexibility of internal ring gear sharply decreases the dynamic factor between the internal ring gear and the planet gear, and it also shows significant positive influences on the system load-sharing performance. For the fixed internal ring gear, the maximum stress is located on the midpoint along the axial direction. The maximum dynamic deformations appear at the ends of the tooth surface along width direction, and the dynamic deformation shows a decremental trend from the tooth top edge to the tooth root edge. The load-sharing coefficient decreases rapidly with the increase in the thickness, as the support stiffness is small. The misalignment of one of the planet pins and various static transmission errors have a negative influence on the load-sharing coefficient of the planetary gear transmission system.

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Abbreviations

M :

Mass

C d :

Damping

K :

Stiffness

α :

Pressure angle

β :

Helical angle

e :

Static transmission error

e:

Natural constant

X :

Displacement

A, B, C :

Fourier expanded coefficients

U v :

Elastic strain energy

P sp :

Potential energy

T :

Kinetic energy

ρ :

Density

E :

Young’s modulus

μ :

Poisson’s ratio

R 0 :

Addendum circle radius of the ring gear

R 1 :

Outer radius of the ring gear

B :

Tooth with of the ring gear

x, θ, r :

Cylindrical coordinates in the axial, circumferential and radial directions

h :

Thickness of the ring gear

\( \bar{r} \) :

\( \bar{r} = r - R_{0} \)

u, v, w :

Displacement components

U, V, W :

Robust form of the Fourier series expansions

δ :

Equivalent displacement

ω :

Natural frequency

b:

Base circle

c:

Carrier

i :

Ordinal number

je:

Pitch circle

p:

Planet gear

r:

Ring gear

s:

Sun gear

l, g, q :

Supplement coefficient

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Acknowledgements

The authors appreciate the financial support from the National Natural Science Foundation of China (Grant Nos. 51405043, 51575060) and Chongqing Innovation Program (Nos. cstc2015zdcy-ztzx70010, cstc2015zdcy-ztzx70012).

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Correspondence to Caichao Zhu.

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Fan, Z., Zhu, C. & Song, C. Dynamic Analysis of Planetary Gear Transmission System Considering the Flexibility of Internal Ring Gear. Iran J Sci Technol Trans Mech Eng 44, 695–706 (2020). https://doi.org/10.1007/s40997-019-00290-3

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  • DOI: https://doi.org/10.1007/s40997-019-00290-3

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