In the recent years, asymmetric gear tooth profiles are being considered for the unidirectional power transmission applications due to the advancement in gear manufacturing techniques. Additionally, the advancement in material development makes polymer and polymer composite gears to replace the metallic gears for the motion as well as power transmission applications. Number of researches has been carried on asymmetric steel gear as well as symmetric polymer gears using numerical techniques. This work attempts to understand the structural behavior of asymmetric polymer spur gears with the aid of experimental and numerical investigation. Four tooth 3mm module, 4mm face width, 18 number of teeth of asymmetric (34°-20°) and symmetric (20°-20°) polypropylene gears were considered for this work. An experimental test rig was developed to simulate gear mesh and torque was applied through dead weights and gear tooth deflection was measured with the aid of rotary encoder. The effect of pressure angle at drive side matches well with the experimental values. Asymmetric gear tooth profile having larger pressure angle (34°) at drive side exhibited least deflection and symmetric gear with 20° pressure angle at both drive and coast side exhibited maximum deflection.
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