Engine Tribology Research Articles

Engine Oil Rheology and Tribology

Engine Oil Rheology and Tribology

Automobile engine tribology—design considerations for efficiency and durability

In the United Kingdom, the Technology Foresight Programme [HMSO, Progress Through Partnership 1 (1995) 126 pp.], through its Transport Panel, revealed the requirement for key generic technologies and scientific research in relation to automobiles. One of the `three major development opportunities which will help accommodate increased demand in a sustainable way' was identified as `vehicles with greater efficiency and reduced environmental impact'. In addition, further studies in `fuel efficiency' and `simulation and modelling' were recommended. The total scope of tribological considerations with regard to the above prospective research themes is immense and the present paper will focus upon the major frictional components of the automobile engine, that is, the bearings, the valve train and the piston assembly. In particular, the current position surrounding the modelling of these components will be reviewed and future possibilities identified. Prediction of overall engine friction will be addressed and the specific issues of modelling of lubricant behaviour and the role of surface topography touched upon.

Trends in engine technology and tribology

Fuel economy is one of the most important factors for both customer satisfaction and environmental protection. In order to improve fuel economy great efforts are being made to reduce mechanical losses by reducing friction loss and the weight of engine components, and trigology plays an important role in reducing friction. Some of the tribological problems that automotive engineers are now facing are described in this paper (for example, the problems of piston rings, pistons, bearings, engine oils, etc.). To promote effective environmental protection, automotive engineers, material engineers and tribologists need to cooperate with each other to solve the difficult aspects of engine tribology.