Exhaust gas purifying device for internal combustion engine

Abstract

The invention provides an exhaust gas purifying device for an internal combustion engine. The device is capable of ensuring sufficient filter effective capacity and exhaust gas purifying capability and reliably holds a honeycomb carrier in a casing member and is capable of reliably capturing a particulate matter or dust, and can keep the wind erosion of the part. The honeycomb carrier (11) includes an outer peripheral portion (P) having inclined portions (112a, 112b) formed on the outer peripheral side of both end faces of a central axis (X) direction, and the closer to the outer peripheral side of the honeycomb carrier, the larger the cross section vertical to the central axis is. An outer peripheral portion is held on the inner wall of a housing member (12) by means of a holding member (13), and the inclined portion has a sealing area (SR) and an open area (OR) which is configured on the periphery of the sealing area and is not sealed. The holding member (13) is configured that the position of at least one of the upstream end (131) and the downstream end (132) in the direction of the central axis and the position of the sealing area in the inclined portion on the central axis direction are overlapped.

Description

technical field [0001] The invention relates to an exhaust gas purification device of an internal combustion engine. Background technique [0002] Conventionally, there is known an exhaust gas purifying device for an internal combustion engine comprising a honeycomb carrier carrying an exhaust gas purification catalyst and having a filter function, and a cylindrical case member that accommodates the honeycomb by means of a holding member. carrier. As the honeycomb carrier, a so-called wall-flow type honeycomb carrier in which the inlet-side openings and the outlet-side openings of adjacent cell cells are alternately sealed is used. When housing the honeycomb carrier in the case member, it is important to securely hold the honeycomb carrier in the case member. [0003] As a technique for holding the honeycomb carrier in the housing member, generally, a mesh ring or the like is used. However, when a net ring or the like is used, the entire filter cannot be efficiently 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.

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