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Theory of Operation Video: time 3:30
Lee Teschler of Machine Design magazine talks to Doug Olson, President and CEO at Harmonic Drive about precision gearing and servo actuators that are used in zero-backlash systems.
Three Basic ElementsThe diagram shows the three basic Harmonic Drive™ strain wave gearing elements CIRCULAR SPLINE – FLEXSPLINE – WAVE GENERATOR assembled in a normal configuration. Ordinarily, the Circular Spline is held stationary or fixed and input is through the Wave Generator, while output is via the Flexspline. Under these circumstances, operation is as follows.
As the Wave Generator is rotated by the primary power source, it imparts a continuously moving elliptical form or wave-like motion to the Flexspline. This causes the meshing of the external teeth of the Flexspline with the internal teeth of the Circular Spline at their two equidistant points of engagement. This meshing progresses in a continuous rolling fashion. It also allows for a full tooth disengagement at the two points along the minor axis of the Wave Generator. Since the Flexspline has two less teeth than the Circular Spline and because full tooth disengagement is made possible
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