US 12,076,716 B2
Honeycomb filter
Fumihiko Yoshioka, Novi, MI (US); and Yudai Kurimoto, Shanghai (CN)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK Insulators, Ltd., Nagoya (JP)
Filed on Feb. 24, 2023, as Appl. No. 18/173,911.
Claims priority of application No. 2022-052934 (JP), filed on Mar. 29, 2022.
Prior Publication US 2023/0311111 A1, Oct. 5, 2023
Int. Cl. B01D 46/24 (2006.01); B01D 53/94 (2006.01); B01J 35/56 (2024.01); F01N 3/28 (2006.01)
CPC B01J 35/56 (2024.01) [B01D 46/24491 (2021.08); B01D 46/2474 (2013.01); B01D 46/2482 (2021.08); B01D 46/2484 (2021.08); B01D 46/249 (2021.08); B01D 53/94 (2013.01); F01N 3/2803 (2013.01); B01D 2255/9155 (2013.01); B01D 2259/4566 (2013.01); B01D 2279/30 (2013.01); F01N 2330/32 (2013.01); F01N 2330/48 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A honeycomb filter comprising:
a honeycomb structure that is pillar-shaped and has porous partition walls disposed so as to surround a plurality of cells each of which serves as a fluid through channel extending from an inflow end face of the honeycomb structure to an outflow end face of the honeycomb structure, and
plugging portions that are disposed at any one of ends on the inflow end face and ends on the outflow end face, of the plurality of cells, wherein,
in a cross section perpendicular to an extending direction of the plurality of cells, the honeycomb structure includes a central portion including a center of gravity O of the cross section, and an outer peripheral portion located outside of the central portion,
a thickness T1 of the partition walls in the central portion is 0.20 to 0.28 mm,
a thickness T2 of the partition walls in the outer peripheral portion is 73 to 90% of the thickness T1 of the partition walls in the central portion,
the outer peripheral portion extends from an outer peripheral edge of the cross section of honeycomb structure by 6 to 12% of a radius r which is from the center of gravity O of the cross section to the outer peripheral edge,
wherein the honeycomb structure has a cell density of 31 to 38 cells/cm2, and
wherein a porosity of the partition walls is 52 to 60%.