Abstract
Substitution of plastic gears for steel gears has been discussed aiming to reduce noise and vibration. Plastic gears are superior in mass, friction and damping characteristics. On the other hand, they are inferior in strength and stiffness that sometimes bring unexpected troubles. The mechanism of vibration excitation by meshing in plastic gears is considered basically same as that of steel gears. However, the difference in stiffness and damping effect can yields different behavior from steel gears. For example, it is well known if you mesh plastic gear with steel gear for the purpose of heat radiation, the plastic gear vibrates much harder than the case of pair of plastic gears. The vibration characteristics of plastic gears are discussed in this report by comparing vibration among gears with different materials.
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