カム軸歯車の騒音およびフェノール樹脂製歯車のそれに及ぼす影響

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  • Noise of Camshaft Timing Gears and Characteristics of Raw Material, Phenolic Resin, Influencing on It
  • カムジク ハグルマ ノ ソウオン オヨビ フェノール ジュシセイ ハグルマ ノ ソレニ オヨボス エイキョウ

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The noise of the timing gears treated in this paper is one of rhythmic but objectionable shock noises which are apt to arise at low speed in the 4-cylinder engine after short using. It was shown by calculations and experiments that the torque driving camshaft had fluctuations due to reactive forces of valve springs, and the direction of driving torque turned back cyclically, then tooth-faces of gears struck each other, and it was the cause of this noise. This noise level was mainly related to the amount of backlash of the gears and became to grow distinguishable when the amount was over 0.2 mm. The amount of backlash varies widely owing to the characteristics, especially sensitive contractilities and expansibilities in soaking conditions, of phenol resin as raw material of the camshaft timing gear. The variation has been possible to be minimized by appropriate selection of material and pretreatment which successfully prevented the timing gear from arising this kind of noise.

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