초록 ▼

An internal combustion engine with a sound-reducing encapsulation, wherein at least the hottest parts of the exhaust system of the engine are located outside of the engine encapsulation and within a special exhaust pipe casing. At the upper side of the exhaust pipe casing an air outlet opening is pr

An internal combustion engine with a sound-reducing encapsulation, wherein at least the hottest parts of the exhaust system of the engine are located outside of the engine encapsulation and within a special exhaust pipe casing. At the upper side of the exhaust pipe casing an air outlet opening is provided through which the air heated by the exhaust system parts can emerge to the surroundings without getting into the encapsulation. The air outlet opening is lined with sound-absorbing material. The free sectional area of the air outlet opening preferably may be variable by flap means and in dependency of an engine operation parameter. The flap means can be operated by a hydraulic cylinder connected to the lubricating system of the engine.

대표청구항 ▼

An internal combustion engine having a spaced sound-reducing encapsulation, at the encapsulation being provided at least each one air inlet and one air outlet opening, a blower arranged between said openings for ventilation of the interspace between the engine and the encapsulation, an exhaust syste

An internal combustion engine having a spaced sound-reducing encapsulation, at the encapsulation being provided at least each one air inlet and one air outlet opening, a blower arranged between said openings for ventilation of the interspace between the engine and the encapsulation, an exhaust system being connected to the engine comprising at least an exhaust manifold being arranged outwardly of the engine encapsulation and exhaust manifold connecting branches, and an exhaust pipe casing being joined to the encapsulation, said casing having air outlet openings at its upper side, at least a part of the exhaust manifold connecting branches also being located outwardly of the engine encapsulation and being enclosed by said exhaust pipe casing, at the exhaust pipe casing there being provided an air discharge duct through which the exhaust pipe extends, said exhaust manifold connecting branches forming in the range of penetration through the side wall of the engine encapsulation each an annular gap with said side wall, in the range of the air outlet openings at the upper side of the exhaust pipe casing there being arranged means to prevent air-transmitted sound from escaping to the surroundings.