Study on Tooth Profiles of the Harmonic Drive

Kondo, Keiichiro; Takada, Jun

doi:10.1115/1.2912570

Cited by 42 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For any value of x k (¼X k ) with respect to the ellipse axes (i.e. xO 1 y axes), the value of Y coordinate, Y ke is calculated using equation (2) and C is calculated using equation (4). Y k , with respect to the central axis (XOY), the parameters used for pitch curve design, is expressed as…”

Section: Check For Tooth Interference In Gearing With Proposed Cammentioning

confidence: 99%

“…Various attempts are made to improve the performance of the strain wave gearing (SWG) system, commonly known as HD, since its introduction by Musser 1,2 in late 1950s. The synthesis of suitable tooth profiles to work with the conventional ovalshaped cam [3][4][5] is one of them. Consequently, attempts are made to optimize deflections of teeth, rim, bearing, length of the flex spline (FS) cup, etc.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and development of strain wave generating cam for a new concept ‘harmonic drive’

Maiti

Biswas

Nema

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

A split cam design is proposed to solve the problem of assembly of the single piece cam in the flexible raced bearing of an earlier proposed novel harmonic drive system, which shows better torque characteristics and capacities in comparison to the conventional one of same size with oval-shaped strain wave generating cam. The cam profile has circular arcs at two working zones at 180° phases. The proposed profile shape is identified as the cause of trouble in assembly if the cam is made single piece. The split cam is made of two identical pieces having circular arc edges. These pieces constitute the cam in assembly after putting it inside the inner race of the flex bearing and adjusted by an adjuster. The design, kinematics, and the assembly method of the proposed split cam are presented in this article. The split cam arrangement not only solves the assembly problem but also gives a scope of fine adjustment of center distance (eccentricity). Such an adjustment is not possible in conventional oval wave generating cam. Stresses in flex gear cups assembled with both type cams at load and no-load conditions are estimated using finite element method. Some results are verified experimentally. Although the flex gear cup with the proposed split cam experiences lower stresses at load transmitting active gear contact zones, it shows higher stresses at some non-active zones (where teeth are free of load). It is apparent from results that stresses at those non-active zones do not increase substantially with the increase in torque, as they are away from active zones.

show abstract

Section: Check For Tooth Interference In Gearing With Proposed Cammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and development of strain wave generating cam for a new concept ‘harmonic drive’

Maiti

Biswas

Nema

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…Dong et al [4] and Chen et al [5] describe the issue study on parameters tooth of the harmonic drive. Kondo et al [6] describe the issue study on profiles tooth of the harmonic drive. The harmonic movement also secures an even distribution of the contact stress on gearing on both sides; this makes it possible to transmit rather high torques (1:50, 1:100 and 1:150).…”

Section: Figure 1 Harmonic Gear System In Creomentioning

confidence: 99%

The Comparison of the Amount of Backlash of a Harmonic Gear System

et al. 2021

View full text Add to dashboard Cite

This article presents a study of the amount of harmonic gear system backlash. The study shows a method for an effective measuring of the amount of backlash in harmonic gear systems. Given that this calculation tasks demand a lot of iterative operations, this article introduces a new method for creating 2D and 3D models of a harmonic gear system. At the same time, this study presents a new way of generating the geometry of a wave generator with a parametrically modified geometry. Introduction of the parametric model of a wave generator allows a rapid optimization of construction parameters, thus securing correct dimensioning and evaluation of the amount of backlash. When creating the computational model, operational characteristics were taken into consideration, therefore, the 2D and 3D computational models were created to correspond with real operation conditions to the greatest extent possible. The results of the analysis imply that the suggested method of examining the design parameters of the wave generator due to the harmonic gear system backlash is effective and correct. The benefit of this article is mainly to introduce a new dynamic computational model of a harmonic gear system and to optimize the construction parameters of the wave generator in line with the amount of backlash, which is manifested in the higher accuracy of the harmonic gear system. In the conclusion of this article we state our recommendations and acquired knowledge.

show abstract

“…Various tooth profiles of the HD have been studied and proposed (Kondo and Takada, 1990; Chen et al , 2014b; Maiti, 2004) under different assumptions. The teeth of FS were assumed to be rigid and the pitch between the teeth of FS was assumed to be constant on the neutral line (Kondo and Takada, 1990).…”

Section: Introductionmentioning

confidence: 99%

Study of a harmonic drive with involute profile flexspline by two-dimensional finite element analysis

Chen¹,

Cheng

Tseng

et al. 2017

View full text Add to dashboard Cite

Purpose This paper aims to present simulation results of a harmonic drive (HD) with involute flexspline (FS) profiles based on two-dimensional (2-D) finite element analysis (FEA). Design/methodology/approach First, the mathematical model of the FS with involute tooth profile was developed using a straight-edge rack cutter based on the theory of gearing. Then the engaging circular spline (CS) with conjugate tooth profile of FS was derived based on the enveloping theory and theory of gearing. Additionally, a mesh generation program was developed to discretize the FS based on the mathematical model. An elliptical wave generator (WG) was inserted into the FS, and a torque was applied to drive the FS meshing with the CS. The WG and the CS were both assumed to be rigid in the finite element model. Findings Finally, a 2-D FEA was conducted to explore the stress distribution on the FS, the engagement movement of the FS, the torsional stiffness and the engaged area of teeth of the HD under various conditions. Moreover, this research also studied the effect of changing pressure angle of the involute FS on the performance of the HD. Research limitations/implications The simulation model and methodology presented in this paper paved the way for further investigation and optimization of the HD with involute tooth profile FS and conjugate CS. Originality/value The simulation model of HD is established on conjugate shape based on the theory of gearing and an automatic mesh generation program is developed to generate the finite element model. The characteristics of the HD can thus be simulated according to the developed model.

show abstract

Study on Tooth Profiles of the Harmonic Drive

Cited by 42 publications

References 0 publications

Design and development of strain wave generating cam for a new concept ‘harmonic drive’

Design and development of strain wave generating cam for a new concept ‘harmonic drive’

The Comparison of the Amount of Backlash of a Harmonic Gear System

Study of a harmonic drive with involute profile flexspline by two-dimensional finite element analysis

Contact Info

Product

Resources

About