DE10347794A1 - Sensor, e.g. for determining temperature of gas, especially vehicle exhaust, comprises sensor component in housing, one end of which has contacts, to which leads are welded, with welds embedded in ceramic - Google Patents
Sensor, e.g. for determining temperature of gas, especially vehicle exhaust, comprises sensor component in housing, one end of which has contacts, to which leads are welded, with welds embedded in ceramic Download PDFInfo
- Publication number
- DE10347794A1 DE10347794A1 DE10347794A DE10347794A DE10347794A1 DE 10347794 A1 DE10347794 A1 DE 10347794A1 DE 10347794 A DE10347794 A DE 10347794A DE 10347794 A DE10347794 A DE 10347794A DE 10347794 A1 DE10347794 A1 DE 10347794A1
- Authority
- DE
- Germany
- Prior art keywords
- housing
- sensor
- sensor according
- sensor element
- counter disc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 33
- 239000000853 adhesive Substances 0.000 claims abstract description 20
- 230000001070 adhesive effect Effects 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 4
- 239000004020 conductor Substances 0.000 claims description 22
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 239000011195 cermet Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 230000000704 physical effect Effects 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims 2
- 239000007789 gas Substances 0.000 description 17
- 239000000523 sample Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/4062—Electrical connectors associated therewith
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4077—Means for protecting the electrolyte or the electrodes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4078—Means for sealing the sensor element in a housing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
- G01K2205/04—Application of thermometers in motors, e.g. of a vehicle for measuring exhaust gas temperature
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
Stand der TechnikState of technology
Die Erfindung geht aus von einem Messfühler zur Bestimmung einer physikalischen Eigenschaft eines Messgases, insbesondere der Konzentration einer Gaskomponente oder der Temperatur eines Messgases, insbesondere des Abgases von Brennkraftmaschinen, nach dem Oberbegriff des Anspruchs 1.The The invention is based on a sensor for determining a physical Property of a measuring gas, especially the concentration of a Gas component or the temperature of a measuring gas, in particular of the exhaust gas from internal combustion engines, according to the preamble of the claim 1.
Bei
einem bekannten Gasmessfühler
(
Der erfindungsgemäße Messfühler mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass die Schweißverbindung einen optimalen elektrischen Übergangswiderstand gewährleistet und eine kostengünstige Fertigung ermöglicht. Durch die Einbettung in eine isolierende, keramische Masse wird die Schweißverbindung mechanisch entkoppelt und dadurch unanfällig gegenüber Schwingungsbeanspruchungen, wie sie bei Verwendung des Messfühlers als Abgassensor in Brennkraftmaschinen in Fahrzeugen auftreten. Infolge der damit erzielten größeren mechanischen Festigkeit des Messfühlers wird dessen Standzeit wesentlich verlängert. Die Einbettung kann durch Einpressen oder Vergießen einer isolierenden Masse oder mittels einer Pulverfüllung erreicht werden.The inventive probe with the features of claim 1 has the advantage that the welded joint an optimal electrical contact resistance guaranteed and an inexpensive Manufacturing enables. By embedding it in an insulating, ceramic mass the welded joint mechanically decoupled and therefore not susceptible to vibration stress, as when using the sensor as Exhaust gas sensor occur in internal combustion engines in vehicles. As a result of the larger mechanical achievements Strength of the sensor its service life will be significantly extended. The embedding can by pressing or casting an insulating mass or by means of a powder filling become.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Messfühlers möglich.By which in the further claims listed activities are advantageous developments and improvements in the claim 1 specified sensor possible.
Gemäß einer vorteilhaften Ausführungsform der Erfindung wird die keramische Masse beim Verbau des Messfühlers als verdichtete Pulverfüllung in das Gehäuse eingebracht und füllt den zwischen dem Sensorelement und der Gehäuseinnenwand vorhandenen Raum aus. Als Pulvermaterial wird vorzugsweise Magnesiumoxid (MgO) verwendet. Zum Einpressen oder Vergießen wird Keramikkleber, Steatit oder Aluminiumoxid (Al2O3) bevorzugt.According to an advantageous embodiment of the invention, the ceramic mass is introduced into the housing as a compacted powder filling when the sensor is installed and fills the space between the sensor element and the inner wall of the housing. Magnesium oxide (MgO) is preferably used as the powder material. Ceramic pressing, steatite or aluminum oxide (Al 2 O 3 ) is preferred for pressing or casting.
Gemäß einer vorteilhaften Ausführungsform der Erfindung wird die Schweißverbindung durch Widerstandsschweißen hergestellt. Das Verschweißen des vorzugsweise aus Nickel (Ni) hergestellten Leiterelements mit der vorzugsweise aus Platin oder einem Platincermet bestehenden Kontaktfläche, kann aber auch mit einem Schweißlaser vorgenommen werden.According to one advantageous embodiment of the Invention is the welded joint by resistance welding manufactured. The welding of the preferably made of nickel (Ni) conductor element with the preferably made of platinum or a platinum cermet contact surface, but can also with a welding laser be made.
Gemäß einer vorteilhaften Ausführungsform der Erfindung ist in dem Gehäuse eine den Gehäusequerschnitt überspannende Gegenscheibe festgelegt, durch die der mindestens eine Leiter hindurchgeführt ist. In das Gehäuse ist ein den Gehäusequerschnitt ausfüllendes Verschlussstück mit einer das Sensorelement im Bereich der Schweißverbindung umschließenden Durchführung eingepresst und der Zwischenraum zwischen Gegenscheibe und Verschlussstück sowie Sensorelement und Wand der Durchführung vollständig mit einem Keramikkleber ausgefüllt. Diese Ausführungsform hat den Vorteil, dass auch noch bei einer Miniaturisierung des Messfühlers der Klebereintrag zu einer optimalen isolierenden Einbindung der Schweißverbindung und einem optimalen gasdichten Verschließen des Sensorelements führt. Dabei ist die Einbringung des Keramikklebers sehr einfach, da keine hohe Genauigkeitsanforderungen an die Position des Einfüllstutzens gestellt werden. Die Klebermenge kann mit hoher Mengentoleranz eingefüllt werden, da überschüssiger Kleber beim Einschieben des Verschlussstücks über die Durchführung im Verschlussstück aus dem Zwischenraum zwischen Verschlussstück und Gegenscheibe verdrängt wird und an der freiliegenden Stirnseite des Verschlussstückes wieder entfernt werden kann. Anhand der aus der Durchführung austretenden Klebermenge ist auch eine Aussage über die Kleberdichtung möglich. Da der Keramikkleber sowohl die Schweißverbindung zum Verschlussstück hin als auch den Zwischenraum zwischen Verschlussstück und Gegenscheibe zum Gehäuse hin abdichtet, kann auf die herkömmliche Dichtungspackung aus zwei Steatitscheiben mit dazwischenliegender Bohrnitridscheibe verzichtet werden, so dass eine in Achsrichtung kurze Bauweise des Messfühlers erzielt wird.According to one advantageous embodiment of the Invention is in the case a spanning the housing cross section Counter disc fixed through which the at least one conductor is passed. In the case is a the housing cross section fills closing piece with a bushing that surrounds the sensor element in the area of the welded connection and the space between the counter disc and the closure piece as well Sensor element and wall of the bushing complete with filled out a ceramic adhesive. This embodiment has the advantage that even with miniaturization of the sensor, the Adhesive entry for optimal insulating integration of the welded joint and an optimal gas-tight sealing of the sensor element leads. there the application of the ceramic adhesive is very easy, since it is not high Accuracy requirements for the position of the filler neck be put. The amount of glue can be filled with a high amount tolerance because excess glue on the Insert the locking piece over the execution in the locking piece the space between the closure piece and the counter washer is displaced and again on the exposed end face of the closure piece can be removed. Based on the amount of adhesive emerging from the bushing is also a statement about the adhesive seal possible. Since the ceramic adhesive both the weld connection to the closure piece as well also seals the space between the closure piece and the counter washer towards the housing, can on the conventional Sealing pack consisting of two steatite disks with an intermediate one Drill nitride disc can be dispensed with, so that one in the axial direction short design of the sensor is achieved.
Gemäß einer vorteilhaften Ausführungsform der Erfindung weist die im Verschlussstück vorgesehene Durchführung für das Sensorelement im Bereich der Schweißverbindung eine an die Querschnittsform des Sensorelements angepasste lichten Querschnitt auf, wobei der lichte Querschnitt ausgehend von der der Gegenscheibe zugekehrten Stirnseite hin zu der von der Gegenscheibe abgekehrten Stirnseite des Verschlussstückes stetig abnimmt. Durch diese Verjüngung der Durchführung wird bei der durch die Einpressung des Verschlussstücks erfolgenden Verteilung des Klebers eine Drosselwirkung bewirkt, wobei der Kleber zunächst radial gleichmäßig verteilt wird, um dann mit zunehmender Einpresstiefe des Verschlussstückes zunehmend durch die Durchführung herausgepresst zu werden.According to an advantageous embodiment of the invention, the bushing provided in the closure piece for the sensor element in the area of the welded connection has a clear cross-section adapted to the cross-sectional shape of the sensor element, the clear cross-section proceeding from the end face facing the counter disk to the end face facing away from the counter disk Closure piece steadily decreases. This tapering of the feedthrough causes a throttling effect when the adhesive is distributed by pressing in the closure piece, the adhesive initially being radial is evenly distributed, in order then to be increasingly pressed out through the bushing with increasing insertion depth of the closure piece.
Die
Vormontage des Messfühlers
zur Herstellung der gasdichten Herausführung des mindestens einen
mit dem Sensorelement verbundenen Leiters aus dem Gehäuse erfolgt
in folgenden Verfahrensschritten:
Die Gegenscheibe, durch die
das mindestens eine Leiterelement hindurchgeführt ist, wird im Gehäuse fixiert,
das Verschlussstück
auf das Sensorelement aufgesetzt, das Sensorelement mit seinem Ende
in das Sackloch der Gegenscheibe eingesteckt und das aus der Gegenscheibe
herausragende mindestens eine Leiterelement mit einer Kontaktfläche am Sensorelement
verschweißt.
Nunmehr wird eine bestimmte Menge an Keramikkleber auf die Gegenscheibe
gegeben und das Verschlussstück
auf dem Sensorelement soweit zu der Gegenscheibe hin verschoben,
bis zwischen Stirnseite des Verschlussstückes und der Gegenscheibe nur
noch ein kleiner Zwischenraum verbleibt, dessen minimale axiale
Tiefe durch das vorgesehene Distanzstück am Verschlussstück festgelegt
ist. In diesem Zwischenraum zwischen Verschlussstück und Gegenscheibe,
dichtet der Keramikkleber Verschlussstück und Gegenscheibe gegenüber dem
Gehäuse
ab.The preassembly of the sensor to produce the gas-tight lead-out of the at least one conductor connected to the sensor element from the housing takes place in the following process steps:
The counter washer, through which the at least one conductor element is passed, is fixed in the housing, the closure piece is placed on the sensor element, the end of the sensor element is inserted into the blind hole of the counter washer, and the at least one conductor element protruding from the counter washer is welded to a contact surface on the sensor element , Now a certain amount of ceramic adhesive is placed on the counter disc and the closure piece on the sensor element is pushed towards the counter disc until there is only a small gap between the front side of the closure piece and the counter disc, the minimum axial depth of which is determined by the spacer provided on the closure piece is. In this space between the closure piece and the counter washer, the ceramic adhesive seals the closure piece and counter washer against the housing.
Zeichnungdrawing
Die Erfindung ist anhand von in der Zeichnung dargestellten Ausführungsbeispielen im folgenden näher beschrieben. Es zeigen:The Invention is based on exemplary embodiments shown in the drawing in the following described. Show it:
Der
in
Der
Messfühler
weist ein Gehäuse
Zum
Anschließen
des Sensorelements
Beim
Einbau des Sensorelements
Die
keramische Masse
Da
die isolierende, keramische Masse
Der
in
In
das Gehäuse
Die
Montage des Messfühlers
zur Herstellung der gasdichten Ausführung der Leiterelemente
Das Anschlussstück
The connector
Claims (17)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10347794A DE10347794A1 (en) | 2003-03-27 | 2003-10-14 | Sensor, e.g. for determining temperature of gas, especially vehicle exhaust, comprises sensor component in housing, one end of which has contacts, to which leads are welded, with welds embedded in ceramic |
| EP04709194A EP1611436A1 (en) | 2003-03-27 | 2004-02-09 | Sensor |
| JP2005518514A JP4317191B2 (en) | 2003-03-27 | 2004-02-09 | Measuring sensor |
| US10/547,400 US7377149B2 (en) | 2003-03-27 | 2004-02-09 | Sensor |
| PCT/DE2004/000215 WO2004086023A1 (en) | 2003-03-27 | 2004-02-09 | Sensor |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10313746 | 2003-03-27 | ||
| DE10313746.7 | 2003-03-27 | ||
| DE10347794A DE10347794A1 (en) | 2003-03-27 | 2003-10-14 | Sensor, e.g. for determining temperature of gas, especially vehicle exhaust, comprises sensor component in housing, one end of which has contacts, to which leads are welded, with welds embedded in ceramic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE10347794A1 true DE10347794A1 (en) | 2004-10-21 |
Family
ID=33016017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE10347794A Withdrawn DE10347794A1 (en) | 2003-03-27 | 2003-10-14 | Sensor, e.g. for determining temperature of gas, especially vehicle exhaust, comprises sensor component in housing, one end of which has contacts, to which leads are welded, with welds embedded in ceramic |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE10347794A1 (en) |
-
2003
- 2003-10-14 DE DE10347794A patent/DE10347794A1/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| 8139 | Disposal/non-payment of the annual fee |