FIELD: engines and pumps.
SUBSTANCE: internal combustion engine includes engine braking device located inside the engine, at least one turbo-supercharger operating on waste gases with turbine operating on waste gases and pressurised air compressor, as well as two outlet collector paths (5, 6) through which waste gases displaced from several cylinders and combined into groups are supplied to turbine (8) through its inlet (7). Each outlet collector path (5, 6) is fully shutoff with shutoff member in the engine braking mode. From the shutoff section of each outlet path (5, 6) there branched is bypass line (14, 15) which is closed and opened with control member (12, 13) and the end section of which is made in the turbine housing wall in the form of nozzle hole (14', 15'), with tangential direction at least approximately to external zone of turbine wheel (17) and opens up to turbine chamber (18). Both shutoff members (10, 11) of outlet paths and both control members (12, 13) of bypass lines are functionally and structurally combined by means of butterfly valve (19) that is installed in butterfly valve housing (20) located in waste gas flow before turbine chamber (18). Both bypass lines (14, 15) are branched off laterally in the housing from mounting hole (21) which contains butterfly valve (19). Butterfly valve (19) has peripheral control wing (22, 22c) by means of which various switching conditions are achieved in various installation positions. Thus, in engine braking mode there branched off are two partial flows of waste gases from waste gases accumulated in shutoff outlet collector paths (5, 6) through bypass lines (14, 15); then, the above partial flows of waste gases are supplied through nozzle holes (14', 15') either in the form of two jets of waste gases or one jet of combined waste gases under high pressure and at high speed to rotating blades of turbine wheel (17), and therefore, speed up the turbo-supercharger. The air compressed due to the above produces an effect in combustion chambers of internal combustion engine (1), which increases the braking power.
EFFECT: simpler design and higher braking power.
14 cl, 14 dwg
