Ngk Spark Plug Company, Limited

Hidekazu Kato

Takayoshi Atsumi

Yasuhiro Fujita

Masahiro Asai

Tatsuya Okumura

Mitsuru Sugihara

Daiki Tabuchi

Tomoyuki Miyashita

A gas sensor includes a metal shell, a gas sensor element held in the metal shell, a metal portion arranged between a flange portion of the gas sensor element and a seat portion of the metal shell and a porous thermal spray layer formed on the gas sensor element. When viewed in cross section along the direction of an axis of the gas sensor, a corner of the metal portion axially overlaps in position with or radially outwardly protrudes from an outer surface of a part of the thermal spray layer located on a side surface of the flange portion and is brought into contact with the seat portion. A rear end-facing surface of the metal portion is brought into contact with an outer surface of the thermal spray layer at a position radially inside the side surface of the flange portion.

Gas sensor

Provided is a gas sensor in which a connection terminal can be favorably fitted onto a cylindrical sensor element without causing a breakage of the connection terminal. An oxygen sensor () includes an outer connection terminal () having an outer fitting portion (), an extension portion () extending inwardly from an axially intermediate point of the outer fitting portion () and pulling prevention portions () and () formed on rear end parts of the outer fitting portion () at positions adjacent to the extension portion (). When the extension portion () of the outer connection terminal () is inserted in and pulled out from a through hole () of a separator (), the extension portion () can be prevented from further pulling in the through hole () by contact of the pulling prevention portions () and () with a front end surface of the separator ().

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Ichinomiya, Japan

Hidekazu Kato