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Сообщение от goncharovroman
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Reliable oil supply even in extremely fast bends
The oil required for lubrication is delivered to the engine by a total of four oil pumps. The reasons for such an unusually elaborate and sophisticated oil supply system are the high standard of dynamic performance and the extreme acceleration of the BMW M6. In bends, for example, BMW's large Coupe is easily able to achieve lateral acceleration of well over 1g. The centrifugal forces generated in such a process press the engine oil into the outer row of cylinders to such an extent that the oil is no longer able to flow back in the usual process from the cylinder head, possibly leading to a lack of oil in the sump. And should worst really come to worst, the oil pump might then draw in air instead of oil.
To rule out such an eventuality, the engine comes with lateral force-controlled oil supply where, starting at lateral acceleration of approximately 0.6 g, one of two electrically driven duocentric pumps draws oil out of the outer cylinder head in a bend and conveys it to the main oil sump. A lateral acceleration sensor serves as the actuator for initiating pump action. The oil pump itself is a volume-flow controlled pendulum slide cell pump delivering exactly the amount of engine oil actually required by the engine. This is made possible by the inner rotor of the pump adjustable in its eccentricity versus the pump housing as a function of current oil pressure in the main oil duct.
A lubrication film which does not break when applying the brakes
When applying the brakes to the extreme, the BMW M6 builds up negative acceleration up to a staggering 1.3 g. Under such extreme conditions, it is quite possible that the flow of oil back to the oil sump serving as an intermediate storage reservoir will no longer be sufficient, especially as the oil sump for reasons of space is fitted beneath the front axle subframe. So if worst came to worst, lubrication might be entirely interrupted. To reliably prevent this eventuality, the engine of the BMW M6 comes with a so-called "quasi-dry sump system" incorporating two oil reservoirs: one in front of the front axle subframe, another behind the subframe.
A reflow pump integrated in the compressed oil pump housing draws oil out
of the small oil sump at the front and pumps it into the large oil sump at the back. Both the reflow openings and the compressed oil pump extraction point are precisely matched to the car's acceleration and driving forces.
вот так
