歯車の発生音の研究 : 第2報,空力音の確認とその挙動

概要

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The behaviour of tooth mesh frequency sound radiated from a tooth mesh point of a spur gear pair was investigated to see how it is generated. After examining the effect of bottom clearance, torque and material (steel or nylon) upon the radiation, the sound proved to be an aerodynamic sound ; i.e., the sound is born from the pumping action of the clearance between meshing teeth, under high speed conditions. Especially in the direction of the exit side of meshing, the radiation is prominent, with a feature of ""level trough"", which occurs due to the existence of two sorts of sounds having the phase difference of 180° nearby the meshing point. It has become also clear that the aerodynamic sound can not necessary be reduced by increasing clearance, after an analogical consideration on the fluctuation of the flow rate of a gear pump.
1986-09-25