Patent ID: 7222408

Claim:
A method of manufacturing a gas sensor comprising: providing a hollow cylindrical housing having a length with a first and a second end portion opposed to each other; a sensor element fitted within said hollow cylindrical housing, said sensor element having formed therein a reference gas chamber; a measurement gas-exposed cover joined to the second end portion of said hollow cylindrical housing, said measurement gas-exposed cover having defined therein a measurement gas chamber into which a gas to be measured by said sensor element is admitted and to which said sensor element is exposed; a reference gas-exposed cover joined to the first end portion of said hollow cylindrical housing, said reference gas-exposed cover having defined therein a reference gas chamber into which a reference gas is admitted and which leads to the reference gas chamber of said sensor element; a sealing member disposed between the first end portion of said hollow cylindrical housing and said sensor element; and an annular end portion formed at the first end portion of said hollow cylindrical housing, said annular end portion including an annular neck and an annular extension which extends from the annular neck toward a tip end of the first end portion and is greater in outer diameter than the annular neck, the annular extension having a shape including an annular tapered portion having an outer diameter decreasing toward the tip end of the first end portion and an annular straight portion extending straight from the annular tapered portion toward the tip end of said first end portion; and crimping the annular extension so that the annular straight portion is bent inwardly of said hollow cylindrical housing.