Patent ID: 11898881
Assignee: NGK INSULATORS, LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A gas sensor comprising:
a casing;
a sensor element held by the casing; and
a protective cover configured to protect a distal end portion of the sensor element that protrudes from the casing, wherein
the protective cover includes an inner member disposed in the casing so as to surround the distal end portion of the sensor element, and an outer member disposed in the casing so as to cover the distal end portion of the sensor element and the inner member,
the protective cover is formed by fitting the inner member and the outer member to each other by press fitting,
the distal end portion of the sensor element is covered with the protective cover by connecting the outer member and a side surface of the casing to each other, connecting the inner member and the side surface of the casing to each other, and fixing by welding a connection portion between the outer member and the side surface of the casing, and
a gas is introduced from outside into a space surrounded by the protective cover and the casing.