HEATING DEVICE FOR AN EXHAUST SYSTEM OF AN INTERNAL COMBUSTION ENGINE

A heating device (6) for an exhaust system (1) of an internal combustion engine (2); the heating device (6) has: a first tubular body (12) wherein a combustion chamber (7) is obtained; a fuel injector (9) to inject fuel into the combustion chamber (7); an inlet opening (18), which is obtained through the first tubular body (12) and can be connected to a fan (8) to receive an air flow, which is directed into the combustion chamber (7); a hot air outlet opening (17) to let hot air out of the combustion chamber (7); an outlet duct (11), which originates from the outlet opening (17); a spark plug (10) which is mounted through a side wall (16) of the first tubular body (12) to trigger the combustion of a mixture of air and fuel; and a labyrinth (26), which surrounds a side wall (16) of the tubular body (12), starts from the inlet opening (18), ends in the combustion chamber (7), and the air must necessarily flow out of the inlet opening (18) until reaching the combustion chamber (7) .