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Bikash Routh

Bio: Bikash Routh is an academic researcher from VIT University. The author has contributed to research in topics: Harmonic drive & Involute. The author has an hindex of 5, co-authored 10 publications receiving 54 citations. Previous affiliations of Bikash Routh include Indian Institute of Technology Kharagpur & Birla Institute of Technology and Science.

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Journal ArticleDOI
TL;DR: In this article, a method of estimating the load shared by the multiple tooth pairs in contact is proposed, where the load distribution pattern in proportion to the tooth deformation is considered.
Abstract: A harmonic drive is a two gear epicyclic drive with a gear set of circular ring gear (RG), a flex rimmed external toothed gear (FG) and an oval cam. FG, with oval cam inside, takes non-circular gear shape encounters improper teeth mating with RG, having only two teeth difference. Consequently, interferences occur at several tooth pairs even at no load. These are inherent and obvious. Overcoming such interferences and further with applied load estimation of load sharing by tooth pairs poses a complex problem. In solving it, first, tooth stiffness of internal gear and external gear are derived in the present investigation. A method of estimating the load shared by the multiple tooth pairs in contact is proposed. The load distribution pattern in proportion to the tooth deformation is considered. Load shared by contacting tooth pairs is estimated and stresses in FG cup are found out using FEM. Finally, such results are compared with experimental results, which have good agreement.

34 citations

Patent
24 Sep 2013
TL;DR: In this paper, ausen verzahnter Verzahnungsbereich (7, 9) werden so verbogen, dass sie elliptische Formen haben, deren Phasen um eine Rotationszentralachse (1a) um 90° gegeneinander verdreht sind.
Abstract: Ein erster und ein zweiter ausen verzahnter Verzahnungsbereich (7, 9) eines Verformungswellgetriebes (1) werden durch einen Wellgenerator (10) in eine elliptische Form verbogen, um in ein erstes bzw. in ein zweites innen verzahntes Zahnrad (2, 4) einzugreifen. Der erste und der zweite ausen verzahnte Verzahnungsbereich (7, 9) werden so verbogen, dass sie elliptische Formen haben, deren Phasen um eine Rotationszentralachse (1a) um 90° gegeneinander verdreht sind. Zwischen dem ersten und dem zweiten ausen verzahnten Verzahnungsbereich (7, 9) ist ein ausen verzahntes Kopplungsverzahnungsbereich (8) ausgebildet, der eine kreisformige Querschnittsform behalt, die sich nicht verbiegt. Der ausen verzahnte Kopplungsverzahnungsbereich (8) wird so auf eingreifende Art und Weise mit einem innen verzahnten Kopplungszahnrad (3) gekoppelt gehalten. Das Verformungswellgetriebe (1) hat eine hohe Eingriffssteifigkeit und ist in der Lage, ein groses Drehmoment zu ubertragen.

32 citations

Journal ArticleDOI
Hang Jia1, Junyang Li1, Guo Xiang1, Jiaxu Wang1, Ke Xiao1, Yanfeng Han1 
TL;DR: A method for analyzing the pure kinematic error of harmonic drive with machining and assembly errors is presented and the one possible new configuration of the wave generator is presented, which can improve the transmission performance of the drive.

20 citations

Journal ArticleDOI
TL;DR: In this paper, a method for detection and quantification of the meshing characteristics of the harmonic drive gear based on computer vision is presented, and a physical-mathematical model is established to determine the relative positions of the selected tooth pair in the process of gear engagement, and the combined standard uncertainty is utilized to evaluate the accuracy of the calculated kinematics parameters.
Abstract: A lack of accurate description of the meshing characteristics and the corresponding frictional mechanism of the harmonic drive gear has limited progress toward modeling the hysteresis stiffness. This paper presents a method for detection and quantification of the meshing characteristics of the harmonic drive gear based on computer vision. First, an experimental set-up that integrates a high speed camera system with a lighting system is developed, and the image processing is adopted to extract and polish the tooth profiles of the meshed teeth pairs in each acquired video sequence. Next, a physical-mathematical model is established to determine the relative positions of the selected tooth pair in the process of the gear engagement, and the combined standard uncertainty is utilized to evaluate the accuracy of the calculated kinematics parameters. Last, the kinematics analysis of the gear engagement under the ultra-low speed condition is performed with our method and previous method, and the influence of the input rotational speed on the results is examined. The results validate the effectiveness of our method, and indicate that the conventional method is not available in the future friction analysis. It is also shown that the engaging-in phase is approximately a uniform motion process, the engaging-out phase is a variable motion process, and these characteristics remain unchanged with the variation of the input rotational speed. Our method affords the ability to understand the frictional mechanism on the meshed contact surfaces of the harmonic drive gear, and also allows for the dynamic monitoring of the meshing properties.

20 citations

Journal ArticleDOI
01 Mar 2016
TL;DR: In this article, the authors describe variations in pitch lengths when teeth move on a strain wave geodesic bearing (SWG) on the flex spline of a Flex Spline.
Abstract: Originally fixed and uniform circular pitches of flex spline (FS) teeth of a ‘Strain Wave Gearing’ or ‘Harmonic Drive’ (HD) experience variations in pitch lengths when teeth move on ‘strain wave ge...

20 citations