US 10,495,602 B2Granted

Gas sensor manufacturing method and gas sensor manufacturing apparatus

AssigneeNGK Insulators, Ltd.

InventorsKenji Isaka, Koji Egawa, Nobukazu Ikoma

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Abstract

Provided is a method for manufacturing a gas sensor which suppresses a defective product caused by a defective posture of a sensor element therein. The method includes a step of obtaining an assembled body constituting the gas sensor, including steps of: causing one end of the sensor element to come to abut to a positioning member for positioning the sensor element; and applying a first force to the annularly-mounted members including a powder compact annularly mounted to the sensor element under a state that the sensor element is positioned and thereby compressing the powder compact so as to fix the sensor element inside of the tubular body, and the compression is performed while constraining the sensor element in a predetermined constraining region in the other end side of the sensor element.

Claims34

Dependent claims

A method for manufacturing a gas sensor, said method including a step of obtaining an assembled body constituting said gas sensor by performing a predetermined processing on a semi-assembled body which is manufactured in advance, wherein said semi-assembled body comprises:

an annular-mounted assembly in which a plurality of annularly-mounted members each having a disc shape or cylindrical shape are annularly mounted around a sensor element with an elongated plate shape comprising a ceramic, the plurality of annularly-mounted members including at least a first ceramic powder compact located on one end side of said sensor element and a second ceramic powder compact located on an other end side of said sensor element opposite said one end side of said sensor element:
and
a tubular body which is annularly mounted to an outer periphery of said annularly-mounted members and capable of engaging said one end side of said annularly-mounted members therein, and
said step of obtaining said assembled body comprising steps of:
a) causing said one end side of said sensor element constituting said semi-assembled body to abut to a predetermined positioning member for positioning said sensor element with respect to said semi-assembled body;
and
b) applying a first force to said annularly-mounted members from said other end side of said sensor element having been positioned through said step a) and thereby compressing said first powder compact and said second powder compact so as to fix said sensor element inside of said tubular body, wherein
said step b) is performed while constraining said sensor element in a predetermined constraining region in said other end side of said sensor element.

5 more elements

A gas sensor manufacturing apparatus, said apparatus including at least an element for obtaining an assembled body constituting said gas sensor by performing a predetermined processing on a-semi-assembled body which is manufactured in advance, wherein said semi-assembled body comprises:

an annular-mounted assembly in which a plurality of annularly-mounted members each having a disc shape or cylindrical shape are annularly mounted around a sensor element with an elongated plate shape comprising a ceramic, the plurality of annularly-mounted members including at least a first ceramic powder compact located on one end side of said sensor element and a second ceramic powder compact located on an other end side of said sensor element opposite said one end side of said sensor element;
and
a tubular body which is annularly mounted to an outer periphery of said annularly-mounted members and capable of engaging said one end side of said annularly-mounted members therein, and
said element for obtaining said assembled body comprising:
a positioning member abutting to said one end side of said sensor element constituting said semi-assembled body for positioning said sensor element with respect to the semi-assembled body;
a first compression element applying a first force to said annularly-mounted members from an other end side of said sensor element which has been positioned by said positioning member and thereby performing a first compression of compressing said first powder compact and said second powder compact;
and
a constraining element capable of constraining said sensor element in a predetermined constraining region in said other end side of said sensor element, wherein
said first compression element performs said first compression under a state that said constraining element constrains said sensor element in said constraining region n said other end side of said sensor element, thereafter to fix said sensor element inside said tubular body.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/464,740Filed 21 Mar 2017
Priority: JP 2016-06151225 Mar 2016
Published: US 2017/0276638 A128 Sep 2017
Granted: 3 Dec 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G01N 27/4078
For investigating or analysing gases: means for sealing the sensor element in a housing
G01N 27/4067
Cells and probes with solid electrolytes: means for heating or controlling the temperature of the solid electrolyte
G01N 33/0037
Specially adapted to detect a particular component: nox
G01N 27/4175
Using cells , i.e. more than one cell and probes with solid electrolytes: calibrating or checking the analyser