| Summary: | Worm gear mechanism transmits power in very small volumes at very high gear ratios. However, their efficiency is very low compared with other gear mechanisms. They have also wear and overheating problems because of force transmission with sliding. On the other hand, bronze is an inexpensive material used in the manufacture of the worm wheel due to wear. Various designs, that provides the contact between the worm gear and the worm wheel by balls have been developed to eliminate the disadvantages of worm gear mechanisms. In this study, the efficiency of the conventional worm gear mechanism and newly designed ball worm gear mechanism which have the same gear ratio and same center distance have been compared experimentally under the same lubrication conditions. Results showed that the efficiency of both mechanisms increases with increasing brake torque at a constant speed. In addition, under constant speed and brake torque, the ball worm gear mechanism showed higher efficiency than the worm gear mechanism.
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