Apparatus for catalytic purifying the effluent gases of internal combustion engines

Claim 2

Apparatus for catalytic purification of exhaust gases in an internal combustion engine comprising a catalyst body adapted to be traversed by said gases in the axial direction, a sheet metal housing surrounding said body and a shock absorbing envelope interposed therebetween, a seal ring secured about the circumference of said body adjacent at least one end thereof, said seal ring extending beyond the frontal edge of said one end and having a free section abutting against the inside surface of said housing about the entire circumference thereof, said catalyst body being calibrated in a circumferential zone about said body adjacent said at least one end thereof, so that said seal ring may be fit thereto, by applying a layer of cement type material between the catalyst body and said seal ring in said circumferential zone and said housing having an annular surface enlarged in the radial direction receiving the free end section of the seal ring for sealing said ring.

Claim 3

Apparatus for catalytic purification of exhaust gases in an internal combustion engine comprising a catalyst body adapted to be traversed by said gases in the axial direction, a sheet metal housing surrounding said body and a shock absorbing envelope interposed therebetween, a seal ring secured about the circumference of said body adjacent at least one end thereof, said seal ring extending beyond the frontal edge of said one end and having a free section independent of but pressing against the inside surface of said housing about the entire circumference thereof said housing having means receiving said free end for providing a substantial axial fixation of said catalyst body said catalyst body being calibrated in a circumferential zone about said body adjacent said at least one end thereof, so that said seal ring may be fit thereto, by applying a layer of cement type material between the catalyst body and said seal ring in said circumferential zone and said seal ring being formed in its middle section with a radially inwardly directed annulus of a reduced diameter serving to concentrate the exhaust gas.

Claim 4

Apparatus for catalytic purification of exhaust gases in an internal combustion engine comprising a catalyst body adapted to be traversed by said gases in the axial direction, a sheet metal housing surrounding said body and a shock absorbing envelope interposed therebetween, a seal ring secured about the circumference of said body adjacent at least one end thereof, said seal ring extending beyond the frontal edge of said one end and having a free section independent of but pressing against the inside surface of said housing about the entire circumference thereof said housing having means receiving said free end for providing a substantial axial fixation of said catalyst body said catalyst body being calibrated in a circumferential zone about said body adjacent said at least one end thereof, so that said seal ring may be fit thereto, by applying a layer of cement type material between the catalyst body and said seal ring in said circumferential zone and said seal ring being formed in its middle section with a radially inwardly directed annulus of a reduced diameter serving to concentrate the exhaust gas.

Claim 5

The apparatus according to claim 2, wherein said housing comprises a pair of two half shells and meaning joining said half shells together along their edges.

Claim 6

The apparatus according to claim 2, wherein the diameter of said inwardly directed annulus is smaller than the outside diameter of the catalyst body.

Claim 7

The apparatus according to claim 2, wherein the frontal edge of said catalyst body is recessed to receive the end of said seal ring.