Influences of circular runout errors and processing parameters for slotting on the accuracy of harmonic reducer

Song, Chaosheng; WANG, Shipu; Li, Xinzi; Zhu, Caichao; Yang, Yong Ming

doi:10.1299/jamdsm.2022jamdsm0003

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…[2][3][4] It is widely used in industrial robots, servo-control systems, and aerospace applications. [5][6][7][8] The structure of the HD is quite simple and includes only three basic components, a flexspline (FS), circular spline (CS), and wave generator (WG); the device primarily depends on the elastic deformation of the FS to transmit the motion. [9][10][11][12] As a non-circular component, there is a difference between the major and minor axes of the WG profile.…”

Section: Introductionmentioning

confidence: 99%

Modeling harmonic drive with small deformation of flexspline and assessment of tooth wear by sliding coefficient

Ling

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Reducing the flexspline (FS) deformation is important for decreasing the alternating stress, flare angle in the axial direction, spatial deformation of teeth, and tube length. However, it may increase the probability of insufficient engagement depth and nonexistent conjugate tooth profiles. In this study, a mathematical model of the harmonic drive (HD) with a new tooth profile is proposed to reduce the FS deformation while satisfying the engagement depth and existence of a conjugated tooth profile. First, the generation mechanism of the new tooth profile is discussed in detail and the connection method of the circular arc tooth profile and transition tooth profile in the FS were presented. Then, two key parameters of the model, the translation distance and offset distance were studied to design the ideal tooth profile. Finally, a tooth root chamfer method was proposed to achieve smooth operation of the HD. Additionally, owing to the lack of a wear assessment of the new tooth profile, a sliding coefficient calculation model was presented. To verify the feasibility of the models, a prototype with a radial deformation coefficient of 0.8 was designed, processed, and tested. The experimental results were consistent with the theoretical analyzes.

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Section: Introductionmentioning

confidence: 99%

Modeling harmonic drive with small deformation of flexspline and assessment of tooth wear by sliding coefficient

Ling

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Circumferential spatial tooth profile modification of flexspline for strain wave gear (A novel method and a case study)

HUANG,

QIAN,

WEI

et al. 2023

JAMDSM

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Strain wave gear, also known as "harmonic drive" is widely used in the industrial robotics field due to the excellent deceleration performance. The tooth modification of the flexspline faces the requirements of high accuracy and service life. In this paper, a novel spatial tooth profile modification method along the circumferential direction of flexspline for strain wave gear is proposed. The circumferential modification method has a small change of meshing point position and working pressure angle, which is beneficial to maintain the transmission accuracy and improve the service life. In addition, the relation model of spatial motion between hob and flexspline, and the relation between tooth profile and modification quantity are study in the view of engineering application aim to reveal that the principle of circumferential modification is the rotation of the tooth profile along the center of the tooth apex circle. And the feasibility of circumferential modification is verified by a actual machining. Then, two main factors, circumferential modification quantity and radius of flexspline indexing circle are analyzed. Afterward, the novel stepwise modification of the circumferential spatial tooth profile of flexspline is introduced. Finally, a case study of circumferential spatial tooth profile modification of flexspline for strain wave gear is conducted. The case study shows that the maximum distance offset value in circumferential modification is 7.8 μm, which is smaller than the traditional modification value (13.2 μm), and the maximum working pressure angle value is 2.24 °, which is smaller than the minimum value (3.93 °) in traditional modification. And the FEM results and the cross-section tooth pairs comparing with the theoretical model also show the possibility of the proposed modification method.

show abstract

Influences of circular runout errors and processing parameters for slotting on the accuracy of harmonic reducer

Cited by 2 publications

References 10 publications

Modeling harmonic drive with small deformation of flexspline and assessment of tooth wear by sliding coefficient

Modeling harmonic drive with small deformation of flexspline and assessment of tooth wear by sliding coefficient

Circumferential spatial tooth profile modification of flexspline for strain wave gear (A novel method and a case study)

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