FEM Analysis of Stress Distribution in the Hermetic Harmonic Drive Flexspline

Pacana, Jacek; Witkowski, Waldemar; Mucha, J.

doi:10.1007/s11223-017-9879-z

Cited by 25 publications

(8 citation statements)

References 14 publications

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“…Experimental method is often used to test the stress of HD (Pacana et al , 2017; Li, 2016; Tjahjowidodo et al , 2013). The stress can be measured through gluing strain gauges to the surface of the FS.…”

Section: Introductionmentioning

confidence: 99%

A rapid stress calculation method for short flexspline harmonic drive

Wang

Jiang

Mei

et al. 2019

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Purpose Because of the compact structure, short flexspline (FS) harmonic drive (HD) is increasingly used. The stress calculation of FS is very important in design and optimization of HD system. This paper aims to study the stress calculation methods for short FS, based on mechanics analysis and finite element method (FEM). Design/methodology/approach A rapid stress calculation method, based on mechanics analysis, is proposed for the short FS of HD. To verify the stress calculation precision of short FS, a complete finite element model of HD is established. The results of stress and deformation of short FS in different lengths are solved by FEM. Findings Through the rapid calculation method, the analytical relationship between circumferential stress and length of cylinder was obtained. And the circumferential stress has proportional relation with the reciprocal of squared length. The FEM results verified that the rapid stress calculation method could obtain accurate results. Research limitations/implications The rapid mechanics analysis method is practiced to evaluate the strength of FS at the design stage of HD. And the complete model of HD could contribute to improving the accuracy of FEM results. Originality/value The rapid calculation method is developed based on mechanics analysis method of cylinder and equivalent additional bending moment model, through which the analytical relationship between circumferential stress and length of cylinder was obtained. The complete three-dimensional finite element model of HD takes the stiffness of bearing into consideration, which can be used in the numerical simulation in the future work to improve the accuracy.

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Section: Introductionmentioning

confidence: 99%

A rapid stress calculation method for short flexspline harmonic drive

Wang

Jiang

Mei

et al. 2019

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“…Dennis et al [4] estimated the contact stress and bending stress of flexible gear teeth through the combination of nonlinear dynamic simulation and finite element analysis, and determined the influence of flexible gear tooth shape change on harmonic transmission performance. Li [5] carried out finite element simulation analysis on a cylindrical flexible wheel, cup flexible wheel and top hat flexible wheel; studied the stress characteristics of flexible wheels with different structures; and verified the simulation results with reference to experiments. Pacana et al [6] established four wave generator models of double roller, four roller, CAM and disc.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Fatigue Characteristic Analysis of the Gear Flexspline of a Harmonic Reducer

Yang

et al. 2022

Mathematics

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The failure of harmonic gear drive is mainly caused by the fatigue fracture of flexible wheels and the fatigue damage of flexible bearings. In this paper, the stress sensitivity and fatigue life characteristics of flexible wheels with thin-walled vulnerable components are studied. Firstly, the structure of the flexible wheel of a B3-80 general harmonic gear reducer is designed, the finite element model of the flexible wheel is established by using ANSYS finite element software, and the finite element analysis results are compared with the theoretical calculations to verify the correctness of the model. Finally, by changing the cylinder length, smooth cylinder wall thickness and load, the maximum equivalent stress curves of the flexible gear ring, smooth cylinder and flexible wheel bottom are obtained, and the influence law of structural parameters on the stress characteristics of flexible wheel is obtained. At the same time, the influence laws of flexible wheel cylinder length and smooth cylinder wall thickness on the fatigue life of flexible wheel is studied, which provides a theoretical basis for the structural optimization design of the cup flexible wheel.

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“…Aiming at the taper deformation of flexspline in cross sections perpendicular to the axis made by the taper deformation under FS of HD produced by cam wave generator, Liu et al (2015) established a design method for space tooth profile of circular spline, which spatial engaged with deformed FS, and a calculation method of backlash between engaged teeth surface. To enable more teeth to participate in meshing, a complete method to design tooth profile and its backlash assessment in an HD is presented by Pacana et al (2017).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional tooth profile design method of harmonic drive considering the deformation difference of the flexspline

Zhang

2021

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Purpose This paper aims to improve the meshing effect of the gear teeth. It is recommended to analyze the deformation difference between the inner and outer surfaces of the flexspline. The purpose of this paper is to modify the profile of the flexspline based on the deformation difference to improve the transmission accuracy and operating life of the harmonic drive. Design/methodology/approach In this paper, ring theory is used to calculate the deformation difference of the inner and outer surfaces of the flexspline, and the actual tooth profile of the flexspline is corrected based on the deformation difference. Then, the flexspline is divided into multiple sections along the axial direction, so that the three-dimensional tooth profile of the flexspline is modified to improve the gear tooth meshing effect. Findings This paper proves the effect of the deformation difference between the inner and outer surfaces of the flexspline on the tooth backlash, which affects the transmission accuracy and life of the harmonic drive. It is recommended to modify the tooth profile of the flexspline based on the deformation difference, so as to ensure the tooth meshing effect. Originality/value This paper provides a new way for the optimization of the three-dimensional tooth profile design of the harmonic drive.

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FEM Analysis of Stress Distribution in the Hermetic Harmonic Drive Flexspline

Cited by 25 publications

References 14 publications

A rapid stress calculation method for short flexspline harmonic drive

A rapid stress calculation method for short flexspline harmonic drive

Modeling and Fatigue Characteristic Analysis of the Gear Flexspline of a Harmonic Reducer

Three-dimensional tooth profile design method of harmonic drive considering the deformation difference of the flexspline

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