Patent ID: 6303013
Filing Date: 2001-10-16
Classification: G01N,Y10T

Abstract:
A gas sensor comprising:a detection element;a cylindrical housing having an insertion hole for receiving the detection element therein;a measurement gas side cover covering a first end portion of the housing in an axial direction of the housing;an air side cover covering a second end portion of the housing in the axial direction;a caulk fixation portion integral with the second end portion of the housing, for fixing the detection element in the insertion hole by caulking; anda sealing member interposed between the caulk fixation portion and the detection element;wherein the caulk fixation portion has a force applying portion for imparting a caulking force to the sealing member directly, a body portion having a thickness larger than the force applying portion in a radial direction of the housing, and a buckling portion provided between the force applying portion and the body portion for increasing the caulking force by buckling in the axial direction; andwherein the caulk fixation portion before caulking satisfies dimensional relationships of:T1<T3<T2;2<T2/T1;and3<L/{(T1+T2)/2},in which T1 is a minimum thickness of the force applying portion in the radial direction of the housing, T2 is a maximum thickness of the force applying portion in the radial direction, T3 is an average thickness of the buckling portion in the radial direction, and L is a length of the force applying portion in the axial direction.