Volume 8: 11th International Power Transmission and Gearing Conference; 13th International Conference on Advanced Vehicle and T 2011
DOI: 10.1115/detc2011-48849
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On a Gearing Problem in Conventional Harmonic Drives With Involute Toothed Gear Set

Abstract: Circular pitches of flex spline teeth of a ‘Strain Wave Gearing’, also known as a ‘Harmonic Drive’, are deformed when the Strain Wave Generating Cam is inserted into the flex spline cup. In the present work the deformed pitch distances considering that flex spline teeth remain rigid while the rim deforms, are estimated. No applied load is considered. It is also shown that if the cam is elliptical then the pitch curve is not an ellipse and vice versa. Geometries of such curves can be defined following the analy… Show more

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Cited by 7 publications
(6 citation statements)
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“…This is possible as the FG tooth bends at the root and tooth leans toward the surface of the RG tooth profile and force contacts occur even at no load, as shown in a recent investigation by Routh and Maiti. 17 However, the gearing laws may not be maintained at the secondary contact although the contact ratio will improve.…”
Section: Appendixmentioning
confidence: 99%
See 1 more Smart Citation
“…This is possible as the FG tooth bends at the root and tooth leans toward the surface of the RG tooth profile and force contacts occur even at no load, as shown in a recent investigation by Routh and Maiti. 17 However, the gearing laws may not be maintained at the secondary contact although the contact ratio will improve.…”
Section: Appendixmentioning
confidence: 99%
“…To improve the performance and life, tribological aspects are also rigorously investigated by Ueura et al 15 On the other hand, FS of composite material is considered to kinematic borne vibrations in HDs. 16 Routh and Maiti 17 have shown that the contact pattern for the internal-external involute gear set in a conventional SWG or HD with the oval-shaped WGC does not maintain the gearing laws properly. Therefore, HDs with involute gears and the conventional oval cam are used for a high ratio but moderate torque output in less precision and relatively low-cost applications.…”
Section: Introductionmentioning
confidence: 99%
“…General working principles and kinematics of HD are well explained by many researchers. [3][4][5][6] In an earlier investigation, it is already presented that the secondary tooth contact is inevitable in HDs with involute toothed gear pair at the least. 3,4 The tooth contact analysis in HDs is complex due to flexion of FG.…”
Section: Introductionmentioning
confidence: 99%
“…When the cam is inserted inside FG cup, the oval-shaped pitch curve of the FG, mating with pitch circle of RG, is not an ellipse. 3,4 However, the pitch length at the inner surface of the FG cup remains unaltered. As the FG teeth are on very thin rim, all tooth roots bend but remain perpendicular on the tangent at the inner midpoint of the respective tooth (refer to Figure 25].…”
Section: Introductionmentioning
confidence: 99%
“…The first two authors of this paper had already presented their first report 1 in recent past about gearing problem in conventional harmonic drive with involute teeth and oval-shaped cam (Figure 1). The investigation was carried out to identify what were the real problems of an HD with pure involute tooth.…”
Section: Introductionmentioning
confidence: 99%