Device for removing pollutants from the exhaust gases of a heat engine

A device for removing pollution from the exhaust gases of a heat engine, comprising:

• a longitudinal outer casing (23) delimiting a passage for the flow of the exhaust gases;
• first and second pollution-removal members (18, 20) mounted in series in the passage;
• and
• a holding sleeve (38) for holding the first pollution-removal member (18), said holding sleeve (38) being interposed between the first pollution-removal member (18) and the outer casing (23) and extending longitudinally at least over most of the length of the first pollution-removal member (18),
• the holding sleeve (38) being guided in the outer casing (23) and forming between the first and second pollution-removal members (18, 20) an abutment surface (40, 86) for longitudinal abutment against which the first pollution-removal member (18) bears,
• wherein the outer casing (23) comprises i) a cylindrical wall (24) in which the first and second pollution-removal members (18, 20) are placed, and ii) a divergent portion (26) rigidly secured to the cylindrical wall (24),
• wherein the divergent portion (26) forms a peripheral shoulder (56) on an opposite side to the second pollution-removal member (20) relative to the first pollution-removal member (18), a front face of the first pollution-removal member being turned longitudinally toward the peripheral shoulder, the first pollution-removal member (18) being compressed longitudinally between the peripheral shoulder (56) and the abutment surface (40), without the holding sleeve (38) being interposed between said front face and said peripheral shoulder (56).

A device for removing pollution from the exhaust gases of a heat engine, comprising:

• a longitudinal outer casing (23) delimiting a passage for the flow of the exhaust gases;
• first and second pollution-removal members (18, 20) mounted in series in the passage;
• and
• a holding sleeve (38) for holding the first pollution-removal member (18), said holding sleeve (38) being interposed between the first pollution-removal member (18) and the outer casing (23) and extending longitudinally at least over most of the length of the first pollution-removal member (18),
• the holding sleeve (38) being guided in the outer casing (23) and forming between the first and second pollution-removal members (18, 20) a surface (40, 86) for longitudinal abutment against which the first pollution-removal member (18) bears,
• wherein the outer casing (23) comprises i) a cylindrical wall (24) in which the first and second pollution-removal members (18, 20) are placed, and ii) a divergent portion (26) rigidly secured to the cylindrical wall (24), and
• wherein the cylindrical wall (24) forms a female end (60) in which a male end (58) of the divergent portion (26) is engaged, a peripheral edge (61) of the holding sleeve (38) being gripped between the male and female ends (58, 60) and welded to the male and female ends (58, 60).