著者

上田 昭夫 渡邉 淳 宮嵜 美弥子 久保 愛三 松岡 裕明

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.847, pp.16-00295-16-00295, 2017 (Released:2017-03-25)

参考文献数

18

---

The purpose of this study is to understand the nature of one of the oldest gears used in traditional Japanese clock. Today's gear manufacturing technology in Japan came mostly from Europe and America, but we do not know exactly, when and how the gears were manufactured for the first time in Japan. It is interesting to search for this history. It is also exciting to study the tooth profile, precision and accuracy of the gears, and materials of the gears at that time. So far, there have been some studies performed for the mechanism of traditional Japanese clocks/watches, but not for gears. Fortunately we have a chance this time to investigate gears for Japanese watch drive that was made in 1688. Tooth profile and pitch error were measured, and transmission error analysis was also performed. It revealed that the precision of the watch was extremely high without any rust for more than 300 years, even though they were all handmade by Japanese mechanism technician named Sukeza-emon Tsuda the III. In the old days, there was no study on conjugate tooth profile theory available, but mysteriously, tooth profile was nearly made in the form of cycloid. Moreover, the gear material investigation was very interesting: The texture of the gear material was very homogeneous and grain size is far smaller than that of today's comparable steel kind. Impurities in it were very small and scattered well in the matrix. The steel was surely made by Japanese sword smith. The ore of the steel was perhaps sand-iron and it was refined with pine charcoal. The steel was forged and forged by hand very hardly. As the result the quality of the steel of 1688 looks far better than today's industrial steel. This research enabled us to discover how Japanese gear technology was born and developed.

著者

竹岡 郁 小森 雅晴 久保 愛三 狩谷 悠史 伊藤 雄大 八田 健一郎 竹内 博之 吉住 恵一

出版者

公益社団法人 精密工学会

雑誌

精密工学会学術講演会講演論文集

巻号頁・発行日

vol.2005, pp.461-462, 2005

---

歯車等の軸状機械部品はそのマイクロオーダーの形状が性能に大きく影響するため,厳しい品質管理が必要となる.原子間力プローブ式形状測定機は従来のCMMより高精度な測定を実現できる可能性があり,これまで非球面レンズ等の表面形状測定に用いられてきた.しかし,原子間力プローブ式形状測定法は上部からの表面形状測定であるため,軸状機械部品のように軸を基準としてその形状誤差が評価されるものに適用するためには,それに対応した測定アルゴリズムが必要となる.本研究では,原子間力プローブ式形状測定機による軸状機械部品の測定·評価法を提案する.また,この測定法に付随する誤差要因とその影響を明らかにする.

著者

久保 愛三 清野 慧

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.46, no.401, pp.86-98, 1980-01-25

被引用文献数

5

---

はすば歯車の正面ならびに歯すじ方向歯形誤差が歯車振動をひきおこす程度の歯のこわさ変動をも考慮して評価する近似的方法を示し,中凸形正面歯形がはすば歯車においても平歯車の場合と同様に最も害の少ない,あるいはその大きさを適当に選ぶならば歯形修整の効果のある歯形形状であること,全かみあい率あるいはねじれ角が大きくなると正面歯形形状にかかわらず歯車振動の起振力が著しく小さくなることなどを明らかにした.