2309 Study on Friction Loss in Valve Train with Cam and Roller Follower : Influences of Roller Support Bearing and Engine Oil

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  • 2309 カム・ローラフォロワ動弁機構の摩擦損失に関する研究 : ローラ支持軸受やエンジン油性状の影響(S26 エンジントライボロジーと潤滑油,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

Abstract

For the valve train with camshafts and roller followers, influences of the roller support bearing and the engine oil property on the friction losses at the contact between cam and roller follower and the contacts of other elements in the valve train were examined by measuring the contact load and the friction force between the cam and the roller follower with a practical sized OHV valve train friction tester. The followings were made obvious. (1) The friction loss is smaller with the roller support of slide bearing than that of needle bearing. (2) When the viscosity of low-SAPS engine oils becomes low, the friction between cam and roller hardly changes but that from the other valve train elements slightly increases. (3) The friction loss is smaller with engine oils lower in sulfur content than DH-2 class engine oils.

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