Sensor
AssigneeNgk Spark Plug Co., Ltd.
InventorsHiroshi Isomura, Takaya Yoshikawa, Junji Kawai, Hisaharu Nishio
Life of this patent
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Abstract
A sensor of the present invention includes a sensor element; a metallic shell; an outer tube member fixed to a rear end portion of the metallic shell; and a protective outer tube member covering an outer surface of the outer tube member. The outer tube member has a seal portion being circumferentially in contact with the protective outer tube member directly or via another member, and a front-side separation portion located frontward of the seal portion and spaced apart from and facing the protective outer tube member. A metal coating layer (plating layer) is formed on the outer surface of at least the front-side separation portion of the outer tube member.
Claims14
A sensor comprising:
- a sensor element which extends axially and whose front end portion is exposed to a gas to be measured;
- a metallic shell surrounding the sensor element;
- an outer tube member fixed to a rear end portion of the metallic shell;
- and
- a protective outer tube member covering an outer surface of the outer tube member;
- the outer tube member having a seal portion being circumferentially in contact with the protective outer tube member directly or via another member, and a front-side separation portion located frontward of the seal portion and spaced apart from and facing the protective outer tube member;
- wherein a metal coating layer is formed on an outer surface of at least the front-side separation portion of the outer tube member.
Dependencies are inferred from the claim text.