Abstract
The injection-molded-plastic-gears are used in such many fields as home electric appliances, information processing equipments, audio-visual equipments, automobiles and so on. In this study, the injection-molded-plastic spur gears were used. The test gears are made from two types of plastic. One of these plastics is polyacetal (POM), and the other one is the plastic filled with rice-hull-silica-carbon (RHSC) as reinforcing materials. The experimental results showed that the RHSC has a beneficial effect on the filler of plastic. Based on the experimental results, the effects of RHSC were discussed. From the discussions, it seems reasonable to conclude: (1) The RHSC decreases the friction of tooth surfaces. So, the high frequency noise is reduced. (2) The process of tooth wears differs in existence of RHSC. Therefore, the gear noise is affected by the wear of tooth surface. (3) The median diameter of RHSC has no effect on the sound-pressure level.
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