金属インサート樹脂成形歯車の耐久性

抄録

Plastic gears are used in a wide range of fields, and various studies have been conducted to improve their performance. The plastic gears have some advantages - for example, light weight and low vibration. It has significantly lower bending fatigue strength than metal gears. In recent years, Meatal-insert plastic-molded gears which combines metal and plastic have been attracting attention as one of ways to increase the fatigue strength of plastic gears. In this paper, we conducted fatigue test to investigate the durability and failure mode using the Metal-inset plastic-molded gears. The plastic coated to metal gears was polyether ether ketone filled with 20% carbon fiber. Failure mode of the gears was not tooth breakage due to bending fatigue, but peeling in the plastic coating layer. Maximum depth of the peeling was close to the depth which maximum shear stress and orthogonal shear stress ware maximum. Therefore, it was suggested that the evaluation could be similar to that of metal gears.