HIGH SPEED HARMONIC DRIVE SPEED REDUCER.
Final rept. Jul 67-Jan 68,
UNITED SHOE MACHINERY CORP BEVERLY MASS HARMONIC DRIVE DIV
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A program was carried out to demonstrate that a modified Harmonic Drive speed reducer could be operated at input speeds well above catalog ratings. The modifications included a special wave generator and a recirculating oil lubrication system. The wave generator employed a double eccentric shaft driving two discs which created the wave shape in the flexspline. At high RPMs the centrifugal force of the orbiting discs was used to react the tooth separating loads, thereby substantially reducing the bearing loads. The unit achieved 18,000 input RPM at 34 normal catalog torque rating. A significant gain in efficiency was obtained over standard ratings. The improvement from 80 to 90 at rated torque conditions indicates that the losses are halved with the double eccentric wave generator. A wheel drive conceptual design is presented in which an electric motor is installed inside the flexspline to achieve an extremely compact assembly. Author
- Machinery and Tools