Patent ID: 6780298
Filing Date: 2004-08-24
Classification: G01N

Abstract:
A gas sensor comprising a gas sensor element and a cylindrical housing for inserting and fixing said gas sensor element, a measured gas side cover having a bottom and provided on a tip end side of said housing and an atmosphere side cover provided on a base end side, whereinsaid measured gas side cover comprises an inner cover for directly covering the gas sensor element, an outer cover directly exposed to measured gas ambience, and a measured gas room inside said inner cover; gas passage holes for leading a measured gas into said measured gas room are provided on side surfaces of said inner cover and said outer cover respectively, and the gas passage hole provided in said outer cover is disposed in a position much closer to a tip end side thereof than the gas passage hole provided closest to the tip end side in said inner cover; partitions extending in an axial direction of the gas sensor are provided between said outer cover and said inner cover; each of said partitions is provided between two adjacent gas passage holes made in said outer cover such that said partitions are circumferentially arranged; each of said partitions projects in a radial direction of the gas sensor, and a projection height of said partitions is &frac13; or more of a clearance between an inner surface of said outer cover and an outer surface of said inner cover; and an axial length of each of said partitions is Â½ or more of an axial length of said gas passage holes made in said outer cover, wherein said partitions are projections provided in circumferential gaps communicating with a plurality of gas passage holes made on the side surface of said outer cover, and these projections provide cuts on part of the side surface of the outer cover, and said partitions are constituted by bending the cut part.