© Aixro GmbH / Woelfle Engineering GmbH
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3. ABOUT THE XR50
The Aixro XR50 is a rotary engine based on the Wankel principle. Its main components are
Rotor with seals (equivalent to the piston with rings of a reciprocating piston engine)
Eccentric shaft (equivalent to the crankshaft)
Housing, also called trochoid due to its oval-like epitrochoid shape
side plates, closing the sides of the housing
The engine is a 4-stroke suction engine. Its rotor has a triangular shape, and the edges of
the rotor are in permanent contact with the trochoid through the apex seals. This creates
three separate combustion chambers along the flanges of the rotor and allows three 4-stroke
processes to run simultaneously. The rotor only rotates at 1/3 of the speed of the eccentric
shaft, so with every rotation of the shaft a different combustion chamber passes the spark
plug.
The processes within the engine, especially the long timings, lead to favourable emissions,
which can be as low as 1% of comparable 2-stroke engines and reach best 4-stroke level in
the driving cycle. The engine can be operated with a catalytic converter.
The XR50 uses a carburettor and fuel lubrication at a ratio of 50:1. Contrary to a two-stroke
engine the oil burns without residues.
To access the combustion chamber the fresh gases first flow though one side plate. Then
they flow through the rotor and the eccentric shaft in axial direction to reach the opposing
side plate. From there they access the combustion chamber. This cools and lubricates the
rotor, main bearing and eccentric shaft. At approx. 5500rpm a vacuum-controlled butterfly
valve opens a second channel of the split inlet port to allow additional gases to flow directly
into the combustion chamber. These cold fresh gases lead to the enormous power of the
XR50.
The particular advantages of the XR50 are its lack of vibration due to balanced rotating
masses, its very compact design, the extreme performance with a very flat torque curve, as
well as very low emissions. In addition the service performance is enormous for a racing en-
gine, and it has long times between overhauls.
Содержание XR50
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