Abstract
Worm gears have several advantages. For example, the large reduction ratio is easily obtained, the noise is small and the power can be transmitted at right angles. But, there are also some disadvantages that the frictional heating is large. Therefore, when a plastic gear is used, it is necessary to be careful. Actually when a plastic is used, it is often used a helical gear instead of the worm wheel. And so the running tests for a plastic helical gear meshed with a steel worm were carried out in a state of unlubricated and grease lubricated conditions using a power-absorbing-type gear test machine. The tooth surface temperatures of a plastic helical gear were examined under various operating condition. On the basis of these results, operating condition and temperature rise from atmospheric temperature of meshing teeth has been confirmed that there is a relationship.
