Rising fuel costs and the need to conserve fossil fuel has led to an increased interest in the role of lubricants in improving fuel economy. Engine friction of crankshaft bearings can account for up to 40 % of engine friction. Lubricant formulations can have a beneficial reduction of engine friction, thus, improving fuel economy. A uniquie journal bearing test rig has been developed to evaluate lubricants under transient and steady-state conditions for passenger car engines and heavy duty diesel engines. The rig can measure bearing friction over a wide temperature, speed and load range. The rig uses production components and can be operated so as to produce the bearing pressures, lambda ratio and shear rates experienced by lubricants in fired engines. The properties of a range of lubricants of varying viscometrics, including Newtonian, non-Newtonian and fully formulated oils have been evaluated. Significant differences due to formulation have been observed. The results of the study have been compared to fuel economy data generated from fired engines with the same lubricants as those tested in the journal bearing rig.
A tribological investigation of lubricant effects on bearing friction and fuel economy for passenger car engines and heavy duty diesel engines
Tribologische Untersuchung des Schmierstoffeinflusses auf die Lagerreibung und die Kraftstoffeinsparung von PKW- und Hochleistungs-Dieselmotoren
2004
6 Seiten, 13 Bilder, 2 Tabellen, 7 Quellen
Conference paper
English
Schmierstoff , Lagerreibung , Kraftstoffeinsparung , Pkw (Personenkraftwagen) , Dieselmotor , Hochleistung , Tribologie , Prüfstand , Radiallager , transienter Zustand , stationärer Zustand , Temperaturbereich , Viskositätsmessung , Newtonsche Flüssigkeit , nicht-Newtonsche Flüssigkeit , Kurbelwellenlager , Schergeschwindigkeit
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