Exhaust manifold for an internal combustion engine

Claim 2

An exhaust manifold for an internal combustion engine comprising a housing enclosing an elongated space, a tubular member disposed in the housing containing catalytic components and having a heat insulating wall which divides the space into first and second parallel chambers extending longitudinally in the space, the second chamber being the bore of the tube and the first chamber being enclosed by a casing covered with a heat insulating material and having a substantially rectangular parallelepiped shaped cross-section, inlet means for flow of exhaust gas from the engine into the first chamber, means for adding air to the said exhaust gas upstream of the inlet means, an opening in said wall for flow of exhaust gas from the first chamber into one end of the second chamber, and means for flow of exhaust gas from the opposite end of the second chamber to an exhaust system of a vehicle.

Claim 3

The exhaust manifold of claim 1 wherein said housing comprises a cast iron body and a cover bolted together to form a joint disposed along a plane which bisects the cross-sections of the two chambers.

Claim 4

An exhaust manifold for an internal combustion engine comprising inlet means for exhaust gas form an internal combustion engine, outlet means to an exhaust duct, a main chamber, an ante-chamber, a heat insulating partition wall disposed between and common to said main and ante-chambers, said chambers extending parallel to each other, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, said flow path defining means including a transfer opening for gas flow from the ante-chamber into the main chamber at one end of the main chamber, said main chamber having an outlet pipe at its other end, said ante-chamber having an irregular prismatic shape having a recessed lower part wherein said main chamber fits along said lower part of the ante-chamber opposite said inlet means, said ante-chamber having an upper surface which, together with said partition wall comprises a double wall with thin intermediate insulation, means in the main chamber for receiving catalytic reaction components disposed between the transfer opening and the outlet pipe, and means for introducing post combustion air into the gas flow path through said ante-chamber.

Claim 5

An exhaust manifold for an internal combustion engine comprising inlet means for exhaust gas form an internal combustion engine, outlet means to an exhaust duct, a main chamber, an ante-chamber, a heat insulating partition wall disposed between and common to said main and ante-chambers, said chambers extending parallel to each other, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, said flow path defining means including a transfer opening for gas flow from the ante-chamber into the main chamber at one end of the main chamber, said main chamber having an outlet pipe at its other end, said ante-chamber having an irregular prismatic shape having a recessed lower part wherein said main chamber fits along said lower part of the ante-chamber opposite said inlet means, said ante-chamber having an upper surface which, together with said partition wall comprises a double wall with thin intermediate insulation, means in the main chamber for receiving catalytic reaction components disposed between the transfer opening and the outlet pipe, and means for introducing post combustion air into the gas flow path through said ante-chamber.

Claim 6

an exhaust manifold for an internal combustion engine comprising inlet means for exhaust gas from an internal combustion engine, outlet means to an exhaust duct, a main chamber and an ante-chamber disposed in an inner jacket, a heat insulating partition wall disposed in the inner jacket between said main and ante-chambers, said chambers extending parallel to each other, an outer jacket surrounding the inner jacket and comprising a body in which said inlet means is attached to the manifold, and a cover which engages the body, said body and cover being arranged to be joined along a plane which substantially bisects the cross-section of both the main and ante-chambers, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, said flow path defining means including a transfer opening for gas flow from the ante-chamber into the main chamber at one end of the main chamber, said main chamber having an outlet pipe at its other end, means in the main chamber for receiving catalytic reaction components disposed between the transfer opening and the outlet pipe, and means for introducing post combustion air into the gas flow path through said ante-chamber.

Claim 7

an exhaust manifold for an internal combustion engine comprising inlet means for exhaust gas from an internal combustion engine, outlet means to an exhaust duct, a main chamber and an ante-chamber disposed in an inner jacket, a heat insulating partition wall disposed in the inner jacket between said main and ante-chambers, said chambers extending parallel to each other, an outer jacket surrounding the inner jacket and comprising a body in which said inlet means is attached to the manifold, and a cover which engages the body, said body and cover being arranged to be joined along a plane which substantially bisects the cross-section of both the main and ante-chambers, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, said flow path defining means including a transfer opening for gas flow from the ante-chamber into the main chamber at one end of the main chamber, said main chamber having an outlet pipe at its other end, means in the main chamber for receiving catalytic reaction components disposed between the transfer opening and the outlet pipe, and means for introducing post combustion air into the gas flow path through said ante-chamber.

Claim 8

An exhaust manifold for an internal combustion engine, comprising inlet means for exhaust gas from an internal combustion engine, outlet means to an exhaust duct, an ante-chamber, a main chamber, a heat insulating partition wall disposed between and common to said main and ante-chambers, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, means in the main chamber for receiving catalytic reaction components, and means for introducing post combustion air into the gas flow path through said ante-chamber, said inlet means comprising tubes which open substantially into the lower part of the ante-chamber tangentially to the surface of the said partition wall.

Claim 9

An exhaust manifold for an internal combustion engine, comprising inlet means for exhaust gas from an internal combustion engine, outlet means to an exhaust duct, an ante-chamber, a main chamber, a heat insulating partition wall disposed between and common to said main and ante-chambers, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, means in the main chamber for receiving catalytic reaction components, and means for introducing post combustion air into the gas flow path through said ante-chamber, said inlet means comprising tubes which open substantially into the lower part of the ante-chamber tangentially to the surface of the said partition wall.

Claim 10

An exhaust manifold for an internal combustion engine, comprising inlet means for exhaust gas from an internal chamber, a main chamber, a heat insulating partition wall disposed between and common to said main and ante-chambers, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, a central sleeve in the main chamber for receiving catalytic reaction components, and means for introducing post combustion air into the gas flow path through said ante-chamber, said main chamber comprising inlet and outlet casings engaged with the ends of said sleeve, and outlet means being in communication with said outlet casing.

Claim 11

An exhaust manifold for an internal combustion engine, comprising inlet means for exhaust gas from an internal chamber, a main chamber, a heat insulating partition wall disposed between and common to said main and ante-chambers, means defining a gas flow path from the inlet means, through the ante-chamber and then the main chamber and on to the outlet means, a central sleeve in the main chamber for receiving catalytic reaction components, and means for introducing post combustion air into the gas flow path through said ante-chamber, said main chamber comprising inlet and outlet casings engaged with the ends of said sleeve, and outlet means being in communication with said outlet casing.

Claim 12

An exhaust manifold as set forth in claim 3, wherein the main chamber has a cylindrical shape and the ante-chamber has substantially a rectangular parallelepipedonal shape.

Claim 13

An exhaust manifold as set forth in claim 4, wherein the inlet means, are formed on a side wall of the outer jacket and the insulating material of the inner jacket portion defining the ante-chamber rests directly on the inner face of said side wall and on the adjacent upper face of said cover, the said inner jacket having a face opposite said side wall, said opposite face forming the common partition wall and receiving the corresponding outer surface of the inner chamber.

Claim 14

An exhaust manifold as set forth in claim 4, wherein the main and ante-chambers comprise separate inter-changeable blocks which are located inside the outer jacket and are held in place by said cover when it is closed.

Claim 15

An exhaust manifold as set forth in claim 6, wherein said outer jacket comprises a body and a cover releasably securable thereto, and wherein said central sleeve is covered with a layer of insulating material and with a mesh grid, said grid having end edges which are gripped between the outer body and the cover.

Claim 16

An exhaust manifold as set forth in claim 10, wherein the end orifices of the said central sleeve have collars and said inlet and outlet casings each have a rim which fits into a respective one of said collars.