S1103-2-1 Noise of Injection-Molded-Plastic-Gear which Mixed Rice-Hull-Silica-Carbon

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, For the test gears, 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 RHSC is one of natural materials, and the polyacetal (POM) is used as standard plastics. The experimental results showed that the RHSC has a beneficial effect on the filler of plastic. Based on the experimental results, the effect of the RHSC were discussed. From the discussions, it seems reasonable to conclude: (1) The sound pressure of meshing frequency at the plastic gear is reduced by the RHSC. (2) The noise due to the slide on the tooth surface decreases as compared with a general plastic gear.