Patent ID: 6418777
Filing Date: 2002-07-16
Classification: G01N

Abstract:
A gas sensor comprising, in combination:a metallic shell having an end and defining a first longitudinal axial passageway; an outer cylinder secured to said end of said metallic shell; a cylindrical insulator received in said first longitudinal axial passageway of said metallic shell and defining a second longitudinal axial passageway; a sensor element received in said second axial longitudinal passageway of said cylindrical insulator for detecting a component of a measurement gas; a cylindrical sealing material layer made of glass, located between said sensor element and said second axial longitudinal passageway of said cylindrical insulator and having a front surface and a rear surface spaced apart from each other along a longitudinal axis of said sealing material layer; and a first stress relieving cushion layer of a porous inorganic substance having a larger face and a smaller face spaced from said larger face along said longitudinal axis of said sealing material layer, said larger face disposed in contact with said front surface of said sealing material layer.