US 10,371,680 B2Granted

Sensor

AssigneeNgk Spark Plug Co., Ltd.

InventorsMakoto Kume, Shingo Ito, Takehiro Oba, Shinya Miyamoto, Suguru Kyoumoto

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Abstract

A gas sensor is provided with a metal shell protecting member formed of a material superior in heat resistance to a metal shell, whereby a high-temperature measurement target (exhaust gas) is prevented from being in direct contact with a region, of a protector internal region of the metal shell, on the front side relative to a protector opposing surface. That is, in the gas sensor, it is possible to suppress corrosion, due to high temperature, of a region, of the protector internal region of the metal shell, on the front side relative to the protector opposing surface (an inner surface and a front end surface of a protector fixing portion), while the metal shell is formed of a material (SUS430) that can be subjected to working (crimping or the like) accompanied with deformation. Therefore, heat resistance of the entire sensor can be improved.

Claims11

Dependent claims

A sensor comprising:

a sensor element that is formed in an elongated shape extending in an axial direction, and includes a detection portion at a front side thereof;
a metal shell that is formed in a tubular shape having a through-hole extending from a front-side opening thereof to a rear-side opening thereof, and holds the sensor element via an element holding member, the sensor element being disposed in the through-hole, with the detection portion projecting from the front-side opening;
a tubular element protector that includes an opening, through which a measurement target passes, and is fixed to a front side of the metal shell, and
a metal shell protecting member, wherein
the metal shell includes, at an outer surface thereof, a protector opposing surface that opposes a rear end portion of the element protector,
the metal shell protecting member is configured to cover, together with the element protector, at least a part of a front end surface of the metal shell, at least a part of an inner surface of the through-hole, and at least a part of a radial outer surface of the metal shell, which is connected with the front end surface of the metal shell, and
wherein the metal shell protecting member is formed of a material having corrosion resistance higher than that of the metal shell.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/414,808Filed 25 Jan 2017
Priority: JP 2016-01163925 Jan 2016
Published: US 2017/0212090 A127 Jul 2017
Granted: 6 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01N 33/0036
Concerning the detector: specially adapted to detect a particular component
G01N 27/407
Cells and probes with solid electrolytes: for investigating or analysing gases
G01N 27/4077
For investigating or analysing gases: means for protecting the electrolyte or the electrodes
G01N 33/0009
Gaseous mixtures, e.g. polluted air: general constructional details of gas analysers, e.g. portable test equipment

Family

US 2017/0212090 A1Pre-grant publication · published 27 Jul 2017
US 10,371,680 B2This patent

From the US filing history. Foreign family members aren’t listed.

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