Ngk Insulators, Inc.

Hideyuki Toyoshima

Toshio Yamada

Takahiro Kondo

Hirotaka Yamamoto

Yasunori Yamazaki

Nobuyuki Kashiwagi

A honeycomb structure including: a honeycomb structure body having porous partition walls which define a plurality of cells extending from an inflow end face to an outflow end face to form through channels for a fluid, and a first circumferential wall which is disposed in at least a part of a circumference of the partition walls, and a second circumferential wall disposed to surround an outer side of the honeycomb structure body, wherein the honeycomb structure body does not have an interface between the partition walls and the first circumferential wall, and in a face perpendicular to an extending direction of the cells, a maximum thickness of the first circumferential wall is from 0.1 to 0.3 mm.

Honeycomb structure

A precise exhaust gas control can be achieved without being influenced by fluctuations of the excess air ratio (&#x3bb;) between cylinders of engines or the size of the diameter (the sectional area) of the honeycomb structure. The honeycomb structure is formed by a plurality of cells separated from one another by porous partition walls and functioning as fluid flow paths, the honeycomb structure includes: a sensor plug-in holewhich is formed in an outer peripheral surfaceof the honeycomb structure and into which a sensor can be plugged, and the sensor plug-in holeis provided with at least one deep holewhich communicates with the sensor plug-in hole.

There is disclosed a method for measuring the strength of a honeycomb structure provided with an insertion hole preferably without generating any chipping. In the strength measuring method of the honeycomb structure, the strength is measured while a rubber plug is inserted into the insertion hole. The rubber plug has a hardness of 45 or more and 90 or less, a clearance between the inserted rubber plug and the inner surface of the insertion hole parallel to the depth direction of the insertion hole is 0.2 mm or more and 2.6 mm or less, and the protruding height of the inserted rubber plug from the peripheral surface of the honeycomb structure is 0.5 mm or more and 5 mm or less.

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Nagoya, Japan

Hideyuki Toyoshima