Sealing structure of gas sensor
AssigneeDenso Corporation
InventorMakoto Shirai
Life of this patent
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Abstract
An improved structure of a mechanical seal for keeping a gas chamber and a reference gas chamber airtight in a sensor body. A packing seal is disposed between a shoulder formed on an inner wall of a housing of the sensor body and a tapered surface of an insulation porcelain installed in the housing to define the gas chamber and the reference gas chamber hermetically. The packing ring is formed by a metal plate which has a thickness of 0.1 mm or more and a Vickers hardness of 200 or more and which is made of at least one of a nickel, a nickel alloy, a titanium, and a stainless steel.
Claims17
A gas sensor comprising:
- a hollow housing having a sealing shoulder formed on an inner wall thereof;
- a sensor element having a length which includes a first and a second portion;
- an insulating member disposed within said housing, retaining said sensor element therein hermetically, said insulating member having a sealing surface formed thereon;
- and
- a metal sealing member interposed between the sealing shoulder of said housing and the sealing surface of said insulating member to hermetically define a first chamber in which the first portion of said sensor element is disposed and a second chamber in which the second portion of said sensor element is disposed, said metal sealing member being made of at least one of a nickel, a nickel alloy, a titanium, and a stainless steel.
A gas sensor comprising:
- a hollow housing having a sealing shoulder formed on an inner wall thereof;
- a sensor element having a length which includes a first and a second portion;
- an insulating member disposed within said housing, retaining said sensor element therein hermetically, said insulating member having a sealing surface formed thereon;
- and
- a metal sealing member interposed between the sealing shoulder of said housing and the sealing surface of said insulating member to hermetically define a first chamber in which the first portion of said sensor element is disposed and a second chamber in which the second portion of said sensor element is disposed, said metal sealing member having a Vickers hardness of 200 or less.
A gas sensor comprising:
- a hollow housing having a sealing shoulder formed on an inner wall thereof;
- a sensor element having a length which includes a first and a second portion;
- an insulating member disposed within said housing, retaining said sensor element therein hermetically, said insulating member having formed thereon a sealing surface having a ten-point average roughness of 10 μm or less;
- and
- a metal sealing member interposed between the sealing shoulder of said housing and the sealing surface of said insulating member to hermetically define a first chamber in which the first portion of said sensor element is disposed and a second chamber in which the second portion of said sensor element is disposed.
A gas sensor comprising:
- a hollow housing having a sealing shoulder formed on an inner wall thereof;
- a sensor element having a length which includes a first and a second portion;
- an insulating member disposed within said housing, retaining said sensor element therein hermetically, said insulating member having a sealing surface formed thereon, said insulating member being made of an alumina ceramic having an alumina purity of 90% or more;
- and
- a metal sealing member interposed between the sealing shoulder of said housing and the sealing surface of said insulating member to hermetically define a first chamber in which the first portion of said sensor element is disposed and a second chamber in which the second portion of said sensor element is disposed.
Dependencies are inferred from the claim text.