The Wankel engine is a type of internal combustion engine that uses a rotary design instead of pistons. It was developed in 1951 by Felix Wankel and uses a four-stroke combustion cycle. The key components are a triangular rotor that rotates inside an oval-shaped housing, with the rotor acting like a piston in a traditional engine. The rotor spins on an eccentric output shaft, turning three times for every one revolution to power the vehicle. Benefits include simplicity, high power-to-weight ratio, and smooth operation, though fuel efficiency is reduced compared to piston engines. It has seen limited automotive use primarily in Mazda vehicles.

1. WANKEL ENGINEWANKEL ENGINE

2. INTRODUCTIONINTRODUCTION
► A type of InternalA type of Internal
Combustion EngineCombustion Engine
that uses a rotarythat uses a rotary
design.design.
► Uses Four strokesUses Four strokes
cycle (Otto cycle).cycle (Otto cycle).
► Developed in 1951 byDeveloped in 1951 by
Felix Wankel.Felix Wankel.

3. 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 MinimizeDesign to Minimize
Volume while MaximizingVolume while Maximizing
Compression ratio.Compression ratio.
► Reuleaux Rotor –Reuleaux Rotor –
Triangular shaped withTriangular shaped with
equaled width.equaled width.

4. 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)

5. 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 tothat forms a seal to
outside of combustionoutside of combustion
chamberchamber

6. ROTORROTOR ContinuedContinued
.. 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.

7. 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.

8. HOUSINGHOUSING
……

9. 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.

10. 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.

12. ADVANTAGESADVANTAGES
► Much simpler comparing to its piston counterpartMuch simpler comparing to its piston counterpart
making it more reliable.making it more reliable.
► Power to weight ratio is superior than pistonPower to weight ratio is superior than piston
engines.engines.
► Smooth power flow and high RPM.Smooth power flow and high RPM.
► No Seizure at high temperature.No Seizure at high temperature.
► Design parameters are almost immune toDesign parameters are almost immune to
catastrophic failures.catastrophic failures.
► Less vibrations due to absence of reciprocatingLess vibrations due to absence of reciprocating
parts.parts.

13. CHALLENGESCHALLENGES
►Consumes more fuel because theConsumes more fuel because the
thermodynamic efficiency of the engine isthermodynamic efficiency of the engine is
reduced by the long combustion chamberreduced by the long combustion chamber
shape and low compression ratio.shape and low compression ratio.
►Manufacturing costs can be higher ,cozManufacturing costs can be higher ,coz
production number is less.production number is less.

14. APPLICATIONSAPPLICATIONS
Currently used inCurrently used in
MAZDA RX8.MAZDA RX8.
.Used in the seat belt.Used in the seat belt
pre-tensioner system ofpre-tensioner system of
some Mercedes-Benzsome Mercedes-Benz
and Volkswagen carsand Volkswagen cars
► Utilised for gasUtilised for gas
compressors, andcompressors, and
superchargers insuperchargers in
icenginesicengines

15. 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

16. FUTURE MODELS:FUTURE MODELS:
APPLICATION OTHER THANAPPLICATION 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 EnginesModel Engines

17. Questions?Questions?
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18. Thank youThank you