成果報告書詳細
管理番号20120000000271
タイトル*平成23年度中間年報 省エネルギー革新技術開発事業/先導研究/内燃機関軸受へのダイヤモンドライクカーボン材料適用の研究開発
公開日2012/5/16
報告書年度2011 - 2011
委託先名大同メタル工業株式会社 国立大学法人名古屋大学 日産自動車株式会社
プロジェクト番号P09015
部署名省エネルギー部
和文要約和文要約等以下本編抜粋:(1) 研究開発の目的
次世代自動車の省エネルギーには、停止時エンジンを止めるようなエコカーシステムや内燃機関と電動モータ、バッテリーを併用したハイブリッドシステムが有効であることはすでに実証済みであり、その更なる効率向上とコスト低減の両立による普及促進が今後の課題である。
英文要約Title: Development of diamond like carbon coated bearing in internal combustion engine (FY2010-FY2012) FY2011 Annual Report:
For energy-saving of next-generation automobile, it has already been demonstrated that idle-stop system and hybrid system of internal combustion engine, electric motor and battery combination is effective. To accelerate their widespread use, the issues are improvement of efficiency and cost reduction. It is essential to reduce friction losses in internal combustion engine in order to reduce the load on the motor or battery when the engine starts and to gain more recycled energy. The object of this project is to develop a bearing with reduced direct contact friction under boundary lubrication conditions between bearing and crankshaft, and improved bearing performance, by applying diamond like carbon (DLC). The target performance of DLC coated bearing, in addition to mass production ability, is to meet the demand for bearing performances (wear resistance and fatigue resistance) and to reduce the direct contact friction while maintaining the durability. Therefore, Daido Metal will develop the technology to apply DLC to bearing materials and evaluate the performance. The DLC film formation method and mass production technology for journal bearings in internal combustion engine will be established. Based on the results, Nagoya University will develop the design principle of DLC with wear resistance, seizure resistance and reduced friction. The mechanism of friction reduction when DLC is in direct contact with shaft will be clarified and the theory about the formation of sliding film on DLC will be proposed. Nissan Motor will develop the technology of the design for engine using DLC coated bearing, and the structure of sliding surface and crankshaft and bearing to reach the contact condition corresponding to the performance characteristic of bearing, and evaluate the performance in engine. The following are the results obtained in 2011. (1)DLC coated samples were selected from the results in 2010, the seizure resistance and friction coefficient of DLC coated and conventional samples were evaluated with ring-on-disk tribometer. Compared with conventional samples, the improved seizure resistance and reduced friction coefficient of DLC coated samples were confirmed. (2)To clarify the mechanisms for high seizure resistance and low friction of DLC, the transformed layer on DLC after sliding in oil was detected, the evaluation method with reflective IR spectroscopy was developed, and the thickness of transformed layer was measured. It was shown that the thickness of transformed layer on DLC after sliding is affected by the applied load and oil temperature. (3)To consider the application of DLC coated bearing to the engine, the friction loss for bearing was calculated by FEM and measured in experiment. The shape of crankshaft and the structure of surrounding parts of housing to control the edge load on the bearing surface were proposed.
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