Abstract
At high operating temperatures, differences in the coefficients of thermal expansion for light metal engine blocks and steel crankshafts cause large bearing gaps to open up between the crankshaft and the main bearing shells. In such cases, significant amounts of oil are needed to ensure an adequate supply of oil to the crankshaft main bearing and the connecting rod bearing. There is also the additional risk of insufficient lubrication at low speeds, e.g. at hot idle. Adapting the oil pump to suit these operating conditions does not get to the root of the problem. Throttle seals by Freudenberg that are integrated into the bearing shells offer a completely new approach.
Published Version
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