A Predictive Model for Wear in Automotive Valve Train systems Shell Research Limited Thornton Research Centre Chester

Format:

Conference/Event

Author/Creator:

Colgan, Tracy, author.

Conference Name:

1989 SAE International Fall Fuels and Lubricants Meeting and Exhibition (1989-09-25 : Baltimore, Maryland, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1989

Summary:

Wear of valve train components is one of the most critical factors limiting the life of automotive engines and in the performance evaluation of lubricants. Finger and rocker follower systems, which are commonly used in modern OHC gasoline engines, are particularly wear-prone, the wear profiles of the cam and follower surfaces exhibiting features that have hitherto defied satisfactory explanation.A new mathematical model based on simple wear theory is presented which is shown to be capable of predicting the essential features of the wear profiles of engine cams and followers. The magnitude of the predicted wear is of the correct order and the influence of changing cam/follower clearance and of hydraulic adjustment are consistent with observations of wear in service. The effects of lubricant viscosity and operating speed on the distribution of wear are discussed.The model is also applied to a conventional cam/tappet OHC valve train system. Comparison of these results with those for the pivoted follower systems sheds light upon the reasons for the apparently higher wear observed in the latter type of valve train

Notes:

Vendor supplied data

Publisher Number:

892145

Access Restriction:

Restricted for use by site license