Rotary piston charger

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The rotary piston charger is a mechanical displacement charger for internal combustion engines . The design for the rotary piston charger comes from Felix Wankel .

function

The rotary piston supercharger is an internal-axis rotary piston machine. The driven internal rotor (rotary piston) rotates eccentrically in the cylindrical external rotor. The rotor ratio in the rotary piston superchargers is either 2 to 3 or 3 to 4. The rotors rotate against each other and without contact to the housing around fixed axes. As a result of the eccentricity , the largest possible volume can be captured, compressed and shifted.

The position of the trailing edge determines the ratio of internal compression. The inner and outer rotors are synchronized by a helical ring gear that is permanently lubricated with grease. The rolling bearings also have permanent grease fillings. Inner and outer rotors are gap-sealed and usually coated. Piston rings seal the working space from the gear space.

The combustion engine usually drives the loader by means of a belt or chain drive. It is either directly coupled (continuous operation) or via a coupling (e.g. magnetic coupling, connection operation). The gear ratio can be constant or variable over the engine speed range. Mechanical positive displacement chargers (MVL) require a significantly larger structural volume than mechanical centrifugal chargers (MKL) for a given volume flow. The MVL is mainly used for small to medium-sized engines for cars, since the ratio of funding volume to construction volume is still acceptable.

advantages

  • Fewer moving parts, making it lighter and more reliable.
  • Complete mass balance and thus less work losses and smoother running.

disadvantage

  • Expensive and cumbersome production.
  • Requires more construction volume.

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