成果報告書詳細
管理番号20110000000588
タイトル*平成22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2011/8/25
報告書年度2010 - 2010
委託先名国立大学法人名古屋大学 日産自動車株式会社 大同メタル工業株式会社
プロジェクト番号P09015
部署名エネルギー対策推進部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 (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。エンジンスタート時のモータ、バッテリー負荷を低減し、回生エネルギーを十分確保するためには、内燃機関の摩擦損失低減が不可欠である。そこで、本研究では、ダイヤモンドライクカーボン(DLC)をクランク支持軸受に適用することで、軸受と軸表面の境界潤滑下における直接接触摩擦を低減、かつ耐久性を向上させた内燃機関軸受を実現することを目的とする。
英文要約Title: Development of diamond like carbon coated bearing in internal combustion engine (FY2010-FY2012) FY2010 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). In particular, we clarify the quantitative mechanism for seizure resistance of DLC materials, and enable bearings to operate at high load to suppress frictional heat generation under boundary lubrication at high speed and load, reduce bearing surface area, reduce viscosity friction power loss for journal bearing from internal combustion engine load condition, during normal running, establish the energy-saving technology of next-generation automobile. The target performance of DLC coated bearing, in addition to mass production ability, is to meet the demand for bearing performances (wear resistance, fatigue resistance, robustness and conformability) and to reduce the direct contact friction while maintaining the durability. Therefore, 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. Based on the theory, 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. 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 2010. (1) The effect on wear volume due to the DLC frictional surface temperature and the load was clarified with wear test in oil at controlled temperature for each load. This result indicated that the wear amount increased with increase of DLC frictional surface temperature, the DLC sliding film transformed to graphite was formed on the surface in oil. The theory about the formation of DLC sliding film with increase of the temperature and shear strength was proposed. (2) The physical property and seizure resistance of DLC were evaluated in order to extract the dominated factor for wear, seizure and friction of DLC. The effect of DLC hardness, thickness and surface roughness on the seizure resistance was confirmed. (3) By caluculating friction loss using model caluculation simulated crankshaft and journal bearing structure to determine bearing load from mixed lubrication condition, the bearing width and shaft diameter to reduced friction of bearing by haff during normal running with maintained crankshaft strength and rigidity.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る