カム·フォロワの摩擦·摩耗·スカツフィング特性: エンジンの性能·信頼性向上のためのトライボロジー技術を求めて

摘要

In order to improve the performance and reliability or internal combustion engines the past experimental or analytical studies conducted by the author and the collaborators as follows on the tribotechnology for the valve train cam & follower and lubricants in the engines have been reviewed to consider the design concepts still important in the future. Firstly, the changes of friction characteristics with the material, the surface roughness or the oil supply method were examined by measuring the friction force of the cam and slipper follower specimens with an original cam follower test rig. Secondly the friction characteristics of the cam and roller tappet was examined by measuring the forces acting onto the tappet body with an original test rig as large as the practical OHV train mechanism. And, the effect to reduce the friction was examined for the surface finishing of the cam lobe or the bearing type to support the roller follower. Thirdly the changes of the friction and scuffing characteristics with the blend of additives like ZnDTP and MoDTC in low viscosity base oils were examined to ascertain the best blend of additives as the high SAPS lubricant. Also, the friction and the wear under the lubrication with the test oil contaminated with diesel soot kinds were measured with the cam and slipper follower test rig. Additionally, the friction and the wear under the lubrication with the low SAPS lubricant with or without the soot contamination were measured to examine the friction and wear characteristics and/or the effect for the compatibility of the test oil with DLC coating or other surface modification like a mirror face finish.%本特集の編集委員会の要請で，著者が長年携わつてきたエンジン·トライボロジー関連の研究の中から，「動弁系カム·フォロワのトライボロジー問題」をソリューションするために独自の方法で調べた摩擦，摩耗，スカツフィングの各特性に関する研究を対象に，その概要と成果を回想する記事を寄せることになつた.とくに，エンジンの生き残りをかけ，性能と信頼性の両面の飛躍的な向上が望まれる動きに合わせ，「摩擦の低減および摩耗ゃスカツフ発生の防止に関するデザィン指針の確立」を目指し，カム·フォロワの要素設計や潤滑油選定に関するトライボロジー技術を検討した研究として重要であると考えるいくつかの成果に触れる.