DE102007037549A1 - Gas sensor for determining e.g. temperature of exhaust gas, in internal combustion engine, has flange formed at protective pipe as single piece, where pipe is shrunk on housing with end section of pipe staying behind flange - Google Patents
Gas sensor for determining e.g. temperature of exhaust gas, in internal combustion engine, has flange formed at protective pipe as single piece, where pipe is shrunk on housing with end section of pipe staying behind flange Download PDFInfo
- Publication number
- DE102007037549A1 DE102007037549A1 DE200710037549 DE102007037549A DE102007037549A1 DE 102007037549 A1 DE102007037549 A1 DE 102007037549A1 DE 200710037549 DE200710037549 DE 200710037549 DE 102007037549 A DE102007037549 A DE 102007037549A DE 102007037549 A1 DE102007037549 A1 DE 102007037549A1
- Authority
- DE
- Germany
- Prior art keywords
- protective tube
- gas
- housing
- pipe
- gas sensor
- 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- Withdrawn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
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
- 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
Abstract
Description
Stand der TechnikState of the art
Die Erfindung geht aus von einem Gassensor zur Bestimmung einer physikalischen Eigenschaft eines Messgases, insbesondere der Konzentration mindestens einer Gaskomponente oder der Temperatur im Messgas, nach dem Oberbegriff des Anspruchs 1.The The invention is based on a gas sensor for determining a physical Property of a sample gas, in particular the concentration at least a gas component or the temperature in the sample gas, according to the generic term of claim 1.
Ein
bekannter Gassensor oder Messfühler (
Offenbarung der ErfindungDisclosure of the invention
Der erfindungsgemäße Gassensor mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass seine Herstellkosten bei Gewährleitung einer gasdichten Verbindung zwischen Schutzrohr und Sensorgehäuse und seiner gasdichten Verbauung im Messgas-Anschlussstutzen deutlich gesenkt werden. Der Dichtflansch mit Dichtfläche lässt sich beim Tiefziehen des Schutzrohrs in einfacher Weise ausformen, und durch Aufschrumpfen des Schutzrohrs auf das Gehäuseende lässt sich ein dauerhafter, mechanisch fester und gasdichter Sitz des Schutzrohrs auf dem Sensorgehäuse realisieren. Die rein mechanische Fügeverbindung zwischen Schutzrohr und Sensorgehäuse vermeidet Materialschädigung durch Gefügeveränderungen und die Verschlechterung der Korrosionseigenschaften durch Legierungsbildung. Hohe Investitionskosten, wie sie für das bekannte Anschweißen des Schutzrohrs an das metallische Sensorgehäuse aufgewendet werden müssen, sind für das Aufschrumpfen nicht erforderlich. Die Verlagerung des Dichtflansches weg vom Sensorgehäuse in das Schutzrohr ermöglicht den Einsatz sowohl eines metallischen Sensorgehäuses, das kostengünstig und materialsparend als Umformteil hergestellt werden kann, als auch eines keramischen Sensorgehäuses, das eine niedrige Wärmeleitfähigkeit besitzt und damit zur Absenkung der Temperaturbelastung des Kabelabgangs im hinteren Teil des Sensorgehäuses beiträgt. Zur gasdichten Verbauung des Gassensors sind geringere Anzugsmomente am Messgas-Anschlussstutzen als bei dem eingangs beschriebenen, bekannten Gassensor erforderlich, so dass eine Gewindeverbindung zwischen Anschlussstutzen und Sensorgehäuse deutlich weniger beansprucht wird.Of the Gas sensor according to the invention with the features of Claim 1 has the advantage that its manufacturing costs in warranty a gas-tight connection between protective tube and sensor housing and its gas-tight construction in the sample gas connection be lowered. The sealing flange with sealing surface leaves forming in a simple manner during thermoforming of the protective tube, and by shrinking the protective tube onto the housing end can be a durable, mechanically strong and gas-tight Fit the protective tube on the sensor housing. The purely mechanical joint connection between protective tube and sensor housing avoids material damage due to structural changes and deterioration the corrosion properties by alloying. High investment costs, as for the known welding of the protective tube must be applied to the metallic sensor housing, are not required for shrinking. Relocation of the sealing flange away from the sensor housing into the protective tube allows the use of both a metallic sensor housing, the cost-effective and material-saving can be produced as a formed part can, as well as a ceramic sensor housing, the one has low thermal conductivity and thus for lowering the temperature load of the cable outlet in the rear Part of the sensor housing contributes. For gas-tight The build-up of the gas sensor has lower tightening torques on the sample gas connection nozzle as required in the known gas sensor described above, so that a threaded connection between connecting piece and sensor housing clearly less stressed.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Gassensors möglich.By the measures listed in the further claims are advantageous developments and improvements of the claim 1 specified gas sensor possible.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist der Schurzrohrendabschnitt zusätzlich auf dem Gehäuse verrastet, wozu im Schutzrohr-Endabschnitt und am Gehäuse ineinandergreifende Sicken ausgeprägt sind. Der kombinierte Aufschrumpf- und Verrastungs- bzw. Clipprozess erlaubt die Aufbringung größerer Schließkräfte als dies bei reiner Aufschrumpfung möglich wäre und eine Verringerung der auftretenden Hertzschen Pressung gegenüber einer reineren Clipverbindung. Hohe Schließkräfte gestatten es, trotz etwas unterschiedlicher thermischer Ausdehnungskoeffizienten der Materialien von Schutzrohr und Sensorgehäuse stabile Fügeverbindungen in einem weiten Temperaturbereich zwischen niedrigen Ümgebungstemperaturen im Ruhezustand und hohen Betriebstemperaturen zu gewährleisten. Niedrige Hertzsche Pressungen ermöglichen Fügeverbindungen zwischen Schutzrohren aus Metall und Sensorgehäusen aus Keramiken, da letztere einen wesentlich niedrigeren Kerbwiderstand als Metalle besitzen.According to one preferred embodiment of the invention is the Schurzrohrendabschnitt additionally locked on the housing, including in the Protective tube end portion and interlocking with the housing Beading are pronounced. The combined shrinking and Locking or clip process allows the application of larger Closing forces than this with pure shrinkage would be possible and a reduction of occurring Hertzian pressure compared to a cleaner clip connection. High closing forces allow it, despite somewhat different coefficient of thermal expansion of the materials of protective tube and sensor housing stable joints in a wide temperature range between low ambient temperatures in the To ensure hibernation and high operating temperatures. Low Hertzian pressure enables joint connections between protective tubes made of metal and sensor housings Ceramics, since the latter has a much lower notch resistance as metals.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Die Erfindung ist anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Es zeigen:The invention is based on a in the drawing illustrated embodiments in the following description. Show it:
Der
in
Der
Gassensor weist ein Sensorgehäuse
Der
aus dem Sensorgehäuse
Das
koaxial in das äußere Schutzrohr
Das
in der vorstehend beschriebenen Weise aus äußerem
und innerem Schutzrohr
Wie
in
Zum
Einbau des Gassensors in den Mess- oder Abgasstrang wird der Gassensor
in den Anschlussstutzen
Anstelle
eines rohrförmigen, metallischen Sensorgehäuses
kann der Gassensor auch ein zylinderförmiges Keramikgehäuse
aufweisen, in den das Sensorelement
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 19739435 A1 [0002] - DE 19739435 A1 [0002]
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710037549 DE102007037549A1 (en) | 2007-08-09 | 2007-08-09 | Gas sensor for determining e.g. temperature of exhaust gas, in internal combustion engine, has flange formed at protective pipe as single piece, where pipe is shrunk on housing with end section of pipe staying behind flange |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710037549 DE102007037549A1 (en) | 2007-08-09 | 2007-08-09 | Gas sensor for determining e.g. temperature of exhaust gas, in internal combustion engine, has flange formed at protective pipe as single piece, where pipe is shrunk on housing with end section of pipe staying behind flange |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102007037549A1 true DE102007037549A1 (en) | 2009-02-12 |
Family
ID=40226973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200710037549 Withdrawn DE102007037549A1 (en) | 2007-08-09 | 2007-08-09 | Gas sensor for determining e.g. temperature of exhaust gas, in internal combustion engine, has flange formed at protective pipe as single piece, where pipe is shrunk on housing with end section of pipe staying behind flange |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102007037549A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012016742A1 (en) * | 2010-08-04 | 2012-02-09 | Robert Bosch Gmbh | Gas sensor |
WO2013041281A1 (en) * | 2011-09-21 | 2013-03-28 | Robert Bosch Gmbh | Sensor for determining at least one property of a gas to be measured |
DE102012207751A1 (en) * | 2012-05-09 | 2013-11-14 | Continental Automotive Gmbh | Method for manufacturing sensor for detecting concentration of substance in gas stream, involves heating hollow glass beads to temperature above its softening point, and are pressed together for obtaining fused glass block |
DE102013210979B4 (en) | 2012-06-12 | 2021-10-07 | Ngk Spark Plug Co., Ltd. | Gas sensor |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19739435A1 (en) | 1997-09-09 | 1999-03-11 | Bosch Gmbh Robert | Sensor |
-
2007
- 2007-08-09 DE DE200710037549 patent/DE102007037549A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19739435A1 (en) | 1997-09-09 | 1999-03-11 | Bosch Gmbh Robert | Sensor |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012016742A1 (en) * | 2010-08-04 | 2012-02-09 | Robert Bosch Gmbh | Gas sensor |
CN103026217A (en) * | 2010-08-04 | 2013-04-03 | 罗伯特·博世有限公司 | Gas sensor |
WO2013041281A1 (en) * | 2011-09-21 | 2013-03-28 | Robert Bosch Gmbh | Sensor for determining at least one property of a gas to be measured |
DE102012207751A1 (en) * | 2012-05-09 | 2013-11-14 | Continental Automotive Gmbh | Method for manufacturing sensor for detecting concentration of substance in gas stream, involves heating hollow glass beads to temperature above its softening point, and are pressed together for obtaining fused glass block |
DE102012207751B4 (en) * | 2012-05-09 | 2016-09-08 | Continental Automotive Gmbh | Method for producing a sensor and sensor |
DE102013210979B4 (en) | 2012-06-12 | 2021-10-07 | Ngk Spark Plug Co., Ltd. | Gas sensor |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R012 | Request for examination validly filed |
Effective date: 20140114 |
|
R079 | Amendment of ipc main class |
Free format text: PREVIOUS MAIN CLASS: G01N0027403000 Ipc: G01N0027406000 |
|
R079 | Amendment of ipc main class |
Free format text: PREVIOUS MAIN CLASS: G01N0027403000 Ipc: G01N0027406000 Effective date: 20140718 |
|
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |