Exhaust gas purification device for internal combustion engines

Abstract

The present invention provides an exhaust gas purification device for an internal combustion engine, which can ensure sufficient filter effective capacity and exhaust gas purification ability, and can reliably retain a honeycomb carrier in a housing member, and can reliably capture particulate matter or dust, and can suppress Keep components from weathering. The honeycomb carrier (11) includes an outer peripheral portion (P) having an inclined portion (112a, 112b), the inclined portion is formed on the outer peripheral side of both ends of the central axis (X) direction, and is formed to be closer to the outer peripheral edge side of the honeycomb carrier. The cross-sectional area perpendicular to the central axis is larger, and the outer peripheral part is held on the inner wall of the housing part (12) by means of the holding part (13), the inclined part has a sealing area (SR) and is arranged on the outer circumference of the sealing area and is not In the opening area (OR) to be sealed, the holding member (13) is configured to have at least one of its upstream end (131) and downstream end (132) in the central axis direction and the sealing area in the inclined portion on the central axis. The positions in the directions overlap.

Description

Technical field [0001] The invention relates to an exhaust gas purification device of an internal combustion engine. Background technique [0002] Conventionally, there has been known an exhaust gas purification device of an internal combustion engine including a honeycomb carrier and a cylindrical housing member. The honeycomb carrier carries an exhaust gas purification catalyst and has a filter function, and the housing member accommodates the honeycomb via a holding member. Carrier. As the honeycomb carrier, a so-called wall-flow honeycomb carrier in which the inflow side openings and the outflow side openings of adjacent cell cells are alternately sealed is used. When the honeycomb carrier is housed in the housing member, it is important to reliably hold the honeycomb carrier in the housing member. [0003] As a technique for holding the honeycomb carrier in the housing member, a technique such as a mesh ring is generally used. However, when a mesh ring or the like is used, ...

AI Technical Summary

Problems solved by technology

[0009] However, in this case, due to the positional relationship between the seal in the inclined portion or the stepped portion and the holding member, there is a possibility that particulate matter (PM) or dust (Ash) of non-combustible components contained in the exhaust gas may be released from the honeycomb carrier. The downstream side of the leakage

And, when the end portion of the holding member on the central axis direction of the honeycomb carrier protrudes from the end face on the central axis direction of the honeycomb carrier, the exhaust gas directly contacts the end portion of the holding member, and wind erosion of the holding member may occur.

Images