Exhaust gas recirculating device
AssigneeNissan Motor Co., Ltd.
InventorsKyugo Hamai, Tsuyoshi Nakano, Yoshimi Uchida
Life of this patent
Estimating the term…
Abstract
An exhaust gas recirculating device in which the intake mixed fuel gas passageway is surrounded by a double wall tube which defines a ring shaped space therebetween. Recirculating exhaust gas is introduced into the ring shaped space to heat the inner tube of the double wall to ease vaporization of the wall stream of fuel and the exhaust gas is blown out from a narrowed outlet of the space so as to well mix the fuel gas mixture and the recirculating exhaust gas.
Claims11
An exhaust gas recirculating device provided in an intake manifold at downstream of a carburetor of an internal combustion engine comprising a double tube positioned in the intake manifold adjacent a riser portion of the manifold, said double tube having an inner tube and an outer tube defining a ring shaped space therebetween, wherein mixed gas is arranged to flow inside said inner tube toward said riser portion, a recirculating exhaust gas passageway introducing a part of exhaust gas of the engine is connected to said ring shaped space, an outlet end of said ring shaped space for expelling said recirculating exhaust gas toward said riser portion is narrowed from periphery to increase flowing speed of said recirculating exhaust gas, and an end of said outer tube at the outlet of the ring shaped space is made longer than that of the inner tube to project beyond the inner tube and terminate within said riser portion.
An exhaust gas recirculating device provided in an intake manifold at downstream of a carburetor of an internal combustion engine comprising a double tube having an inner tube and an outer tube defining a ring-shaped space therebetween, wherein mixed gas is arranged to flow inside said inner tube, a recirculating exhaust gas passageway introducing a part of exhaust gas of the engine is connected to said ring shaped space, outlet end of said ring-shaped space for deriving out said recirculating exhaust gas is narrowed from periphery to increase flowing speed of said recirculating exhaust gas, and an end of said outer tube at the outlet of the recirculating exhaust gas of the ring-shaped space is made longer than that of the inner tube to project beyond it,
- wherein the inner tube is made of high heat conductive material and the outer tube is made of a material having less heat conductivity than that of the inner tube.
An exhaust gas recirculating device provided in a vertically extending intake manifold at below and downstream of a carburetor of an internal combustion engine comprising a double wall construction having an inner tube and an outer body surface defining a ring shaped space therebetween, wherein mixed gas of the engine is arranged to flow inside said inner tube downwardly, a recirculating exhaust gas passageway introducing a part of exhaust gas of the engine being connected to said ring shaped space at upper portion thereof, outlet end of said ring shaped space for deriving out said recirculating exhaust gas is narrowed from outer periphery by the outer body surface to increase flowing speed of said recirculating exhaust gas, and an end of said outer body surface at the outlet of the recirculating exhaust gas of the ring shaped space is made longer than that of the inner tube to project beyond it.
Dependencies are inferred from the claim text.