Abstract
Mechanical equipment that will not be reused is defined as disposable machinery. Disposable harmonic drives (HDs) are commonly used in the field of aerospace and are sensitive to payloads. Reasonable calculation of the gear strength is essential for structural design. A method of calculating the contact characteristics of HDs under full load by combining a surface contact model with a three-dimensional finite element model (FEM) is proposed in this work. The mathematical model was established for calculating the no-load backlash of conventional and disposable harmonic gears after assembly. Afterward, the tooth load distribution and surface contact stress were determined using the Hertz contact theory. Finally, ABAQUS software was used to establish the FEM of the disposable HD, and the results were compared with those obtained from the theoretical model. The results revealed that the disposable harmonic gear can realize short-term transmission under full load.
Highlights
Conventional mechanical systems, equipment, or devices that are long-running and repeatedly used are referred to as conventional machinery
A harmonic gear drive is composed of three basic components—an internal tooth rigid wheel, an external tooth flexible wheel, and an elliptical wave generator assembled in the flexible wheel
ConTchluesmioensshing and contact characteristics of the disposable harmonic drives (HDs) were investigated by meaTnhseofmthesehHinegrtazncdonctoanctatchtecohryaraancdtearisfitnicitseoeflethmeendtismposdaebl.leFuHrDthewrmeroerien, vtheestdigifafteerdenbcyes mineatnhseonfot-hleoaHdebrtazckcolanstha,ctlothadeodryistarnibduatiofinn,itaenedlecmonentatcmt sotdreesl.s Fbuerttwheremn otwreo, tHheDdsifwfeerr-e enevceasluiantetdh.eTnhoe-cloandclubsaicoknlsasohf,thloisadstuddisytraibreustiuomn,maanrdizecdonatsacfot lslotrwess: between two HDs were evaluated
Summary
Conventional mechanical systems, equipment, or devices that are long-running and repeatedly used are referred to as conventional machinery. The long cup flexible wheel structure is generally adopted in order to reduce the stress concentration at the bottom of the cup and prolong the service life This structure cannot meet the requirements of the small size and light weight of disposable HDs. Considering that disposable harmonic gears have very high requirements for the ultimate carrying capacity and structural size, a straight cylinder flexible wheel with a complex wave harmonic drive was adopted in this study. Calculation of the Backlash Associated with the Involute Profile Harmonic Gear under No load Figure 5 shows the contact tooth pair between the flexible wheel and the rigid wheel x FOR PMEEacRhinResE2V02I2E,W10, 96. After the transmission system is loaded, both the flexible wheel shell
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