# US 9,752,477 B2 · Honeycomb structure

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- Number: US 9,752,477 B2
- Document ID: US9752477B2
- Status: Granted
- Kind: B2
- Application number: 14/618,196
- Filed: 2015-02-10
- Published: 2015-08-27
- Granted: 2017-09-05
- Earliest claimed: 2014-02-25
- Assignees: NGK Insulators, Ltd.
- Applicants: NGK Insulators, Ltd.
- Inventors: Tomokatsu Aoyama; Masataka Yamashita; Michio Suzuki
- Web page: https://patentgrep.com/patent/US9752477B2

## CPC

- F01N 3/0222: {the structure being monolithic, e.g. honeycombs}
- B01D 46/2451: {characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure}
- B01D 46/2459: {of the plugs}
- B01D 46/247: {of the cells}
- B01D 46/2478: {Structures comprising honeycomb segments}
- B01D 46/2482: {Thickness, height, width, length or diameter}
- B01D 46/2486: {characterised by the shapes or configurations}
- B01D 46/249: {Quadrangular e.g. square or diamond}
- B01D 46/2492: {Hexagonal}
- B32B 3/12: characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
- C04B 38/0012: {characterised by the material used for sealing or plugging (some of) the channels of the honeycombs}
- F01N 2330/06: Ceramic, e.g. monoliths
- F01N 2330/30: Honeycomb supports characterised by their structural details
- Y02T 10/12: Improving ICE efficiencies
- Y10T 428/24157: Filled honeycomb cells [e.g., solid substance in cavities, etc.]
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A honeycomb structure including a honeycomb structure body, first plugging portions, and second plugging portions. The honeycomb structure body has a porous partition wall. The first plugging portions are disposed at an outflow side end face of inlet cells and an inflow side end face of outlet cells. The inlet cells are the predetermined cells of the honeycomb structure body. The outlet cells are the residual cells of the honeycomb structure body. The second plugging portions are not fired. The first plugging portions form a checkered pattern at the inflow side end face and the outflow side end face. The number of the second plugging portions is within 3% of the number of cell open ends where the first plugging portions are not formed, on both end faces of the honeycomb structure body.

## Claims

### Claim 1

A honeycomb structure comprising:
a honeycomb structure body which has a porous partition wall with one end face and another end face, the partition wall defining a plurality of cells, the cells extending from an inflow side end face to an outflow side end face, the inflow side end face being the one end face while the outflow side end face being the other end face, the cells forming channels for exhaust gas;
first plugging portions disposed at the outflow side end face of inlet cells and at the inflow side end face of outlet cells, the inlet cells being predetermined cells of the honeycomb structure body, the outlet cells being residual cells of the honeycomb structure body, the first plugging portions plugging the cells with a first plugging material which is fired; and
second plugging portions plugging the cells where the first plugging portions are not formed with a second plugging material, the second plugging material containing an adhesive material and an aggregate, which is not fired afterward and remains unfired,
wherein the number of the second plugging portions is within 3% of the number of cell open ends where the first plugging portions are not formed, on both end faces of the honeycomb structure body,
wherein the honeycomb structure body is formed by bonding a plurality of honeycomb segments, each honeycomb segment including the porous partition wall which defines the plurality of cells, and
the second plugging portions are provided in a range up to the third cell from an outermost circumference of the honeycomb segment.

### Claim 2 (depends on 1)

The honeycomb structure according to claim 1, wherein
a material of the second plugging portion is identical to a material of an outer circumference coating material, the outer circumference coating material coating an outer circumference of the honeycomb structure body.

### Claim 3 (depends on 1)

The honeycomb structure according to claim 1, wherein
the second plugging portions are provided at an inflow side end face of the honeycomb structure.

### Claim 4 (depends on 1)

The honeycomb structure according to claim 1, wherein
the shape of the cells of the honeycomb structure is any of a square shape, a rectangular shape, a diamond shape, and a hexagonal shape.

### Claim 5 (depends on 4)

The honeycomb structure according to claim 4, wherein
the second plugging portions are provided at an outflow side end face of the honeycomb structure and at cells aligned on diagonal lines of the cells passing through a center of the honeycomb structure.

### Claim 6 (depends on 1)

The honeycomb structure according to claim 1, wherein
the second plugging portions have a different color from the first plugging portions.

### Claim 7 (depends on 1)

The honeycomb structure according to claim 1, wherein
a hydraulic diameter of the cells open at an inflow side end face is larger than a hydraulic diameter of the cells open at an outflow side end face.

### Claim 8 (depends on 1)

The honeycomb structure according to claim 1, wherein
the honeycomb structure is made of a ceramic material of at least one kind selected from the group consisting of cordierite, alumina, mullite, aluminum titanate, silicon nitride, and silicon carbide.