The gear teeth have influence on the stresses in flexspline, through the influence coefficients of gear tooth of flexspline. For the purpose of theoretically clarifying this influence, the profile of the gear tooth of the flexspline is simplified as two simple shapes of rectangle and trapezoid. The gear tooth influence on the stresses in the flexspline has been studied and analyzed on this two cases, and the two simplified tooth profiles of rectangle and trapezoid have been compared with each other.
The fatigue strength check of the flexspline is the premise and basis of the design of harmonic drive. Fatigue strength of the flexspline with inner and outer gear ring of micro harmonic drive are checked.Through the check calculation and finite element analysis, fatigue strength of inner and outer gear ring can meet the strength requirements.
This paper is focused on the micro harmonic drive with a planet type wave generator in which flexspline consists of internal and external gear rings. The mathematical relationship between the coordinates of the points on the tooth profile of the deformed flexspline and that of the undeformed flexspline is derived by carrying on the coordinates transformation. According to this mathematical relationship, the coordinates of the points on the both sides of the tooth profile of every gear tooth of the one forth of the internal and external gear rings of the deformed flexspline are solved with the use of the mathematical software, then the coordinates are imported into the software Pro/E, and connect in a correct order with spline curves, the two curves have been mirrored and extended to finish the 3D modeling of the deformed flespline. At last, the FEM analysis of the deformed flexspline has been carried out.
On the basis of a transmission error-testing laboratory bench which is designed in advance, the research and design of a transmission error-testing system of harmonic drive are carried on. The structural composition and test principle of this testing system are introduced. Based on the software, LabView2009, the design of the transmission error-testing system of harmonic drive is finished. With the help of this testing system, the following purposes can be realized. The input and output angle data of the harmonic drive can be acquired, its transmission error is capable of being analyzed and the data will be able to be stored.
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