Importance

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Abstract

An exhaust gas re-circulation system provides for intake of exhaust gases from a first end 206 into one of a plurality of corrugated inner tubes 204 housed within an outer tube 200. Corrugations in said inner tube 204 provide for an increased surface area for heat exchange with a surrounding coolant medium and for decreased velocity of flow of exhaust gas increasing the density of charge of exhaust gas returned to a combustion chamber of an associated internal combustion engine by an inlet manifold where said exhaust gas re-circulation system connects to said inlet manifold at a second end 207. Said outer tube provides for inlet 203 and outlet 202 of coolant medium. Said outer tube further comprises corrugated portions to withstand vibration/expansion. Said inner and outer tubes are manufactured from thin wall metal tubes. Exhaust gas cooling occurs over the entire path length of the exhaust gas re-circulation system and is enhanced at bends 201 in the exhaust gas re-circulation system by formation of turbulent flow of the exhaust gas within said inner members 204 thus providing for increased heat exchange by occupying all of the available space within said corrugated inner members 204. No separate cooler unit is required and therefore the exhaust gas re-circulation system may be bent to be packaged around an internal combustion engine to provide for economy of space.

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First Claim