Patent ID: 9140585
Filing Date: 2015-09-22
Classification: G01D,G01N

Abstract:
1. A gas sensor comprising: a cylindrical housing which extends in a longitudinal direction of the gas sensor; a sensor element inserted into the inside of the housing while having a distal end side thereof projecting from a distal end of the housing; a sealing material which is filled in a gap between the sensor element and the housing; a cylindrical insulation member which is arranged on a proximal end side of the sealing material so as to surround the sensor element and having at least an outer surface of the proximal end portion thereof spaced apart from an inner surface of the housing; and an annular metal ring which is arranged on a proximal end side of the insulation member and has an outer peripheral portion thereof projecting outward in a radial direction from the proximal end portion of the insulation member, wherein the sealing material, the insulation member and the metal ring are fixed by caulking in a pressed state from a proximal end side to a distal end side by a caulking portion which is formed by bending a proximal end portion of the housing inward, the caulking portion is brought into close contact with a whole proximal-end facing surface of the outer peripheral portion of the metal ring, and a portion of an inner end of the caulking portion is gradually spaced apart in the longitudinal direction from a radially inner end portion of a proximal-end facing surface of the metal ring at an opposing region where the caulking portion and the metal ring face each other in an opposed manner in the longitudinal direction.