舶用減速歯車における歯面荷重の許容限界について : (第2報使用実績よりの検討)

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In this paper the author has investigated the working conditions on about fifty gears of nineteen ships which has been used for propulsion.As the result of these examinations he can bear the following contributions to the process of tooth surface failure and its influence to the tooth breakage.(1) The condition of tooth surface failure is represented by the pitting distribution in the direction perpendicular to the pitch line.(2) The process of increase in pitting is devided into the following six stages.(a) P_0 ; No pitting is noted with the naked eye.(b) P_1 ; Some pittings are observed on pitch line in a line.(c) P_2 ; Pittings are observed as a band with some width on the pitch line.(d) P_3 ; Pittings band extends to the tooth root.(e) P_4 ; In addition to the above, new pittings are noted on the part close to the tooth tip.(f) P_5 ; Larger pitting are noted irregularly on the tooth surface.(3) In some cases high speed pinion and gear teeth may be broken in the stage P_2,but in general the teeth breakage of high speed ones take place in P_3 or subsequent stages.(4) However hard the pitting may be, any teeth of low speed pinion or gear is hardly broken.From these results above mentioned, the author propose that the allowable maximum load of marine reduction gears is to be calculated by follwing formula.P={4.9-2.53(2-(h_<a1>+h_<a2>)/m)}d√^4<n/(1000)> where P ; tooth load per pinion face width in kg/cm h_<a1> ; h_<a2>addendum of pinion and gear respectively in mm m ; module of gear tooth n ; revolution of pinion in r. p. m.d ; pinion diameter in cm According to the tooth load calculated by this formula, not only the tooth breakage of high speed pinion and gear but also the severe pitting of low speed ones may be prevented.

著者

星野次郎
日本海事協会

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