著者

野老山 貴行 梅原 徳次

出版者

一般社団法人 日本トライボロジー学会

雑誌

トライボロジスト (ISSN:09151168)

巻号頁・発行日

vol.65, no.4, pp.236-241, 2020-04-15 (Released:2020-04-15)

参考文献数

18

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From time immemorial, shaving one’s beard has been continued. Using razor or electric shaver is common for all male adult to show their cleanliness recently. The custom for shaving my beard by myself was harbingered by World War I and II. Tremendous safety razors were provided by US government to frontline infantry, then they acquired a custom of “shaving by myself”. An electric shaver was invented early of the 20th century, and it is divided two shaving motion, a rotation or a reciprocation. In this article, investigating the relation between inner blade’s edge radiuses and pulling force, clarifying differences of shaving mechanism of a rotation or a reciprocation type shaver by a high speed camera with measuring pulling force simultaneously are explained.

著者

蟹 拓実 野老山 貴行 梅原 徳次 村島 基之 李 義永 八木下 和宏

出版者

一般社団法人 日本トライボロジー学会

雑誌

トライボロジスト (ISSN:09151168)

巻号頁・発行日

vol.66, no.7, pp.570-578, 2021-07-15 (Released:2021-07-15)

参考文献数

40

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In general, several mechanical parts are subjected to friction and wear. To prevent wear and high friction coefficient under lubrication, additives can work to reduce friction force, to build up thin film on surfaces which is so-called tribofilm. Recently, Diamond-Like Carbon (DLC) is focused because it has excellent low friction and high wear proof as solid lubricant. However, several researchers already reported that tetrahedral amorphous carbon (ta-C) showed abnormal wear when it rubbed with glycerol mono-oleate (GMO) that is a kind of additive, although it showed very low friction coefficient. To improve tribological properties, new additives were developed that had both phosphate-oxide structure derived from ZnDTP which had high wear resistance and hydroxyl group derived from GMO in one structure. To clarify the effects of the additives, friction tests were performed fixed-roller-on-disk type rotating friction tester. In the friction tests, hydrogenated amorphous carbon (a-C:H) disks, and a-C:H coated rollers were used under boundary lubrication condition at 20-80°C. Friction tests were conducted in Poly-α-olefin (PAO) oil with each GMO and the additives. The results exhibited that a-C:H gave ultra-low friction with the additive. Elemental analysis of the surface showed that tribofilm of phosphorus and oxygen was detected on the a-C:H surface in the additive used condition.

著者

炭竈 美穂 梅原 徳次 野老山 貴行 上坂 裕之

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.80, no.811, pp.SMM0038, 2014 (Released:2014-03-25)

参考文献数

13

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Disc brake is one of the most important auto mobile components and the toughest frictional components. Nowadays, the lightweight disc brake is needed for better fuel-efficient. To reduce the weight, high frictional and low aggressive brake pad is required. However, generally high friction cannot provide low wear of counter-part, therefore to make such brake pad is difficult. In addition, including many kinds of materials such as abrasive, binder, filler and so on, we cannot design it theoretically. In order to overcome these issues we focused on abrasive shape in brake pad, especially focused on open angle of abrasive φ and the important index “degree of wear fab”. If degree of wear fab decreases with open angle φ of abrasive and reduction of wear is more than reduction of friction, we can propose the high frictional and low aggressive brake pad which includes small open angle abrasive. In order to validate our proposals, we conducted the scratch test using Vickers indenter and Knoop indenter. As a result of the scratch test, we clarified that the ratio of wear coefficient to friction coefficient K / μ is correlated with degree of wear fab, and in the region of ploughing and wedge, degree of wear fab decreased with decreasing open angle φ. Due to these phenomena, the ratio of wear coefficient to friction coefficient K / μ decreased with decreasing open angle φ in the region of ploughing and wedge. Thus it was valid that small open angle abrasive provides high friction and low aggressiveness.

著者

梅原 徳次 後藤 実 月山 陽介 野老山 貴行 吉野 雅彦 川口 雅弘 上坂 裕之 村島 基之

出版者

名古屋大学

雑誌

基盤研究(S)

巻号頁・発行日

2013-05-31

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摩擦誘導ナノ構造層による超低摩擦の安定指針を得るため2つの装置を試作し、超低摩擦発現モデルを提案した。「超低摩擦発現ナノ構造変化層の摩擦時その場計測装置」により、カーボン系硬質膜の無潤滑時の超低摩擦は摩擦で形成するナノ構造変化層の厚さ、硬さ及び表面粗さが重要で、それらのパラメータを用いた「薄膜固体潤滑理論」が超低摩擦モデルとして妥当であることを定量的に明らかにした。また、「超低摩擦摩擦面の表面エネルギーのESEM内その場評価装置」により、摩耗痕の表面エネルギーの低減が摩擦低減に有効であることを定量的に明らかにし、超低摩擦が発現した際はナノ構造層の内部で摩擦する超低摩擦メカニズムを提案した。