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US 2010/0247400 A1Published application
Honeycomb filter and method of manufacturing the same
AssigneeNGK Insulators, Ltd.
InventorsShingo TOKUDA, Takashi MIZUTANI
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AssigneeNGK Insulators, Ltd.
InventorsShingo TOKUDA, Takashi MIZUTANI
Estimating the term…
The honeycomb filter 10 is constructed as a diesel particulate filter (DPF) having a filtration function for filtering out the PM (particulate matter) included in an exhaust emission of a diesel engine. The honeycomb filter 10 has a honeycomb structure 12 as a base and inlet opening cells 16 with surface layers 26 formed on respective inner surfaces thereof. The surface layer 26 has zero film thickness in an inlet peripheral region 28. Separation vortexes are generated in the inlet peripheral regions 28. The zero film thickness of the surface layers 26 in the inlet peripheral regions 28 naturally causes non-flaking of the surface layers 26 induced by the separation vortexes generated in the inlet peripheral regions 28 and thereby leads to non-production of flakes. In the non-existent condition of flakes, the overall surface layers 26 are not collapsed by collision of the flakes.
A honeycomb filter structured to have a large number of cells parted by porous partition walls, where the large number of cells include inlet opening cells with open inlets and outlets sealed with outlet sealing members and outlet opening cells with inlets sealed with inlet sealing members and open outlets, the inlet opening cells and the outlet opening cells are arranged alternately to be adjacent to each other, and each of the inlet opening cells has an inner surface covered with a surface layer having smaller pores than pores of the porous partition walls,
Dependencies are inferred from the claim text.