How Rotary Engines Work

No more boring introductions, lets get started & understand how does a Wankel engine work & what exactly it is !

History :-

The first Wankel engine was developed by German engineer – Felix Wankel. Wankel received his first patent for the engine in 1929.

However, the Wankel engine design used today is designed by Hanns Dieter Paschke – which he adopted forming the modern engine !

Wankel engine :-

Wankel engine is an Internal combustion engine unlike the piston cylinder arrangement. This engine uses the eccentric rotor design which directly converts the pressure energy of gases into rotatory motion. While in the piston-cylinder arrangement, the linear motion of the piston is used to convert into rotatory motion of crankshaft.

Basically, in a simple way, the rotor revolve in housings shaped in a fat figure-of-eight.

Rotor :- The rotor has three convex faces which acts like a piston. The 3 corners of rotor forms a seal to the outside of the combustion chamber. It also has internal gear teeth in the centre on one side. This allows the rotor to revolve around a fix shaft.

Housing :- The housing is epitrochoidal in shape(roughly oval). The housing is cleverly designed as the 3 tips or corners of the rotor always stay in contact with the housing. The intake and exhaust ports are located in the housing.

Inlet & exhaust ports :- The intake port lets fresh mixture enter into combustion chamber & the exhaust gases expel out through outlet/exhaust port.

Spark plug :- A spark plug delivers electric current to the combustion chamber which ignites the air-fuel mixture leading to abrupt expansion of gas.

Output shaft :- The output shaft has eccentric lobes mounted on it, which means they are offset from

centreline of the shaft. The rotor is not in pure rotation, but we need these eccentric lobes for pure rotation of the shaft.

Note :- The output shaft is a thing which can’t be explained completely in words. It is quite difficult to imagine it’s contribution in the working. this video link might help you to understand it.

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