Audi is working on the totally new kinds of four-cylinder engine that is supposed to become as smooth running like a six-cylinder or eight-cylinder unit. The move comes as premium car makers embark on the big reduction inside the fuel consumption of larger models - for example the A8 L - by downsizing engines and using hybrid drivetrains.
It’s thought that Audi plans was awarded a patent for that unusual design last year. The description is for the “internal combustion engine with multi joint crank drive and additional masses on articulated connecting rods for damping free inertia forces. ”In simple terms, this design uses a radically different layout to avoid generating the internal forces that make four-pot engines less smooth. The pistons and conrods Not run in line using the crankshaft. Instead, they‘re offset to at least one side from the crank and connected inwith it via a rocker-style link. The centre from the rocker link is linked with the crank and also the other end to some second conrod, and that is attached to some fixed shaft and also has a counterweight at its head.
The principle appears to be that the four-cylinder engine will run more smoothly without pistons moving on a single axis like the crankshaft, and that the counterweight on finished of the next conrod should further damp out unwanted internal forces.
As configured inside the drawing above, the new engine could be as wide a normal ‘V’ engine. Also, when the secondary shaft was lobed as a camshaft and may also be swivelled along its axis, this arrangement might permit variable compression ratios. Obtain the latest car news, reviews and galleries from Autocar direct within your inbox every week. Enter your current email below : Audi plans super-smooth four-cylinder engine
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