WANKEL ENGINEWANKEL ENGINE

INTRODUCTIONINTRODUCTION► A type of Internal A type of Internal

Combustion Engine Combustion Engine that uses a rotary that uses a rotary design.design.

► Uses Four strokes Uses Four strokes cycle (Otto cycle).cycle (Otto cycle).

► Developed in 1951 by Developed in 1951 by Felix Wankel.Felix Wankel.

Rotary DesignRotary Design► 4 stroke engine (intake, 4 stroke engine (intake,

compression, combustion, compression, combustion, exhaust)exhaust)

► Rotor on eccentric shaft.Rotor on eccentric shaft.► Design to Minimize Design to Minimize

Volume while Maximizing Volume while Maximizing Compression ratio.Compression ratio.

► Reuleaux Rotor – Reuleaux Rotor – Triangular shaped with Triangular shaped with equaled width.equaled width.

PARTSPARTS

►ROTORROTOR ►HOUSINGHOUSING . Coolant passages. Coolant passages . intake and exhaust ports. intake and exhaust ports . Spark plugs. Spark plugs

►OUTPUT SHAFT (eccentric lobes)OUTPUT SHAFT (eccentric lobes)

ROTORROTOR. Three convex faces. Three convex faces. Each acts like a piston. Each acts like a piston pocket on face increasespocket on face increases displacement of enginedisplacement of engine. Apex is a metal blade . Apex is a metal blade that forms a seal to that forms a seal to outside of combustion outside of combustion chamberchamber

ROTOR ROTOR Continued Continued

.. The rotor has a set of internal gear teeth cut into the centre of one side .These teeth mate with a gear  that is fixed to the housing .This gear mating determines the path and direction the rotor takes through the housing.

HOUSINGHOUSING

. It is roughly oval in shape. It is roughly oval in shape

.. The shape of the combustion chamber is designed so that the three tips of the rotor will always stay in contact with the wall of the chamber, forming three sealed volumes of gas.. Each part of the housing is dedicated to one part of the combustion process.

HOUSING HOUSING

……

OUTPUT SHAFTOUTPUT SHAFT

. The output shaft has round lobes mounted eccentrically.. Each rotor fits over one of these lobes..  The lobe acts sort of like the crankshaft in a piston engine.

OPERATIONOPERATION► R­otary engines also uses the

four-stroke combustion cycle.► The heart of a rotary engine is

the rotor which is equivalent to a piston.►  The rotor is mounted on a

large circular lobe on the output shaft .

► The rotor orbits inside the housing, it pushes the lobe around in tight circles, turning three times for every one revolution of the rotor.

ADVANTAGESADVANTAGES► Much simpler comparing to its piston counterpart Much simpler comparing to its piston counterpart

making it more reliable.making it more reliable.► Power to weight ratio is superior than piston Power to weight ratio is superior than piston

engines.engines.► Smooth power f low and high RPM.Smooth power f low and high RPM.► No Seizure at high temperature.No Seizure at high temperature.► Design parameters are almost immune to Design parameters are almost immune to

catastrophic failures.catastrophic failures.► Less vibrations due to absence of reciprocating Less vibrations due to absence of reciprocating

parts.parts.

CHALLENGESCHALLENGES►Consumes more fuel because the Consumes more fuel because the

thermodynamic efficiency of the engine is thermodynamic efficiency of the engine is reduced by the long combustion chamber reduced by the long combustion chamber shape and low compression ratio. shape and low compression ratio.

►Manufacturing costs can be higher ,coz Manufacturing costs can be higher ,coz production number is less.production number is less.

APPLICATIONSAPPLICATIONS

Currently used in Currently used in MAZDA RX8.MAZDA RX8. .Used in the seat belt .Used in the seat belt

pre-tensioner system of pre-tensioner system of some Mercedes-Benz some Mercedes-Benz and Volkswagen carsand Volkswagen cars

► Utilised for gas Utilised for gas compressors, and compressors, and superchargers in superchargers in icenginesicengines

Future DevelopmentFuture Development

Future Engines:Future Engines:1.1. FUEL INJECTION TYPE ROTARY ENGINEFUEL INJECTION TYPE ROTARY ENGINE

2.2. STRATIFIED CHARGE TYPE ROTARY ENGINESTRATIFIED CHARGE TYPE ROTARY ENGINE

3.3. SUPERCHARGE TYPE ROTARY ENGINESUPERCHARGE TYPE ROTARY ENGINE

4.4. DIESEL ROTARY ENGINEDIESEL ROTARY ENGINE

5.5. MULTI-ROTOR TYPE ROTARY ENGINEMULTI-ROTOR TYPE ROTARY ENGINE

FUTURE MODELS:FUTURE MODELS:APPLICATION OTHER THAN APPLICATION OTHER THAN

AUTOMOBILES:AUTOMOBILES: MotorcycleMotorcycle SnowmobileSnowmobile Outboard EngineOutboard Engine High-speed BoatHigh-speed Boat Light PlaneLight Plane HelicopterHelicopter Industrial EnginesIndustrial Engines Chain SawsChain Saws Model Engines Model Engines

Questions?Questions?

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Thank youThank you