EP0938669A1 - Detecteur de gaz - Google Patents

Detecteur de gaz

Info

Publication number
EP0938669A1
EP0938669A1 EP98952545A EP98952545A EP0938669A1 EP 0938669 A1 EP0938669 A1 EP 0938669A1 EP 98952545 A EP98952545 A EP 98952545A EP 98952545 A EP98952545 A EP 98952545A EP 0938669 A1 EP0938669 A1 EP 0938669A1
Authority
EP
European Patent Office
Prior art keywords
spring element
gas sensor
sensor element
connection
opening
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Withdrawn
Application number
EP98952545A
Other languages
German (de)
English (en)
Inventor
Helmut Weyl
Hans-Martin Wiedenmann
Theodor Graser
Karl-Heinz Effenberger
Clemens Simon
Anton Hans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0938669A1 publication Critical patent/EP0938669A1/fr
Withdrawn legal-status Critical Current

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

Definitions

  • the invention is based on a gas sensor, in particular a lambda probe, for determining the pollutant and / or oxygen content in exhaust gases from internal combustion engines according to the category of the main claim.
  • DE 42 04 850 AI discloses a gas sensor which has a housing which serves to accommodate a sensor element.
  • the sensor element has a section on the connection side and a section on the measurement gas side.
  • a connecting element By means of a connecting element, the sensor element having a plurality of electrically conductive contact surfaces is connected at its connection-side section to electrically conductive connection conductors.
  • the connecting element consists of two parts held together by a sleeve, between which the sensor element and the connecting conductors are held immovably. Due to the fact that several parts are required to connect the connecting conductors to the sensor element, the assembly of the gas sensor, in particular the connection of the sensor element to the connecting conductors, is complex. Furthermore, the manufacturing cost of the multi-part connecting element is high. Advantages of the invention
  • the gas sensor according to the invention with the features of the main claim is characterized in that the connecting element is formed by a spring element made in one piece from ceramic material. Because the spring element is formed in one piece, it is very simple and therefore inexpensive to manufacture, for example in the extrusion process, that is to say only in one operation.
  • the sensor element and the connecting conductors are non-positively connected to one another by means of the easily mountable spring element.
  • the connecting parts are first introduced or inserted into a through opening of the preferably annular spring element and then the sensor element is fixed and held by sliding the spring element on. Alternatively, it is also possible to insert the sensor element into the through opening or, if necessary, to insert it by pressing. The installation of both versions is quick and easy.
  • a large contact force acting in the radial direction between the connection conductors, the sensor element and the spring element can be realized by means of the spring element.
  • the sensor element is only slightly dynamically stressed by the small mass of the spring element, that is, only a small deflection occurs in the event of vibration.
  • the gas sensor it is provided that at least one slot is made in the through opening of the spring element.
  • the spring element When the spring element is pushed onto the sensor element or when the sensor element is inserted into the through opening of the spring element, the latter is spread apart. This ensures that the connecting conductors are at least substantially not displaced when the non-positive connection is formed and maintain their position within the through opening.
  • the “force-free connection” is related to the sliding of the spring element onto the sensor element and / or the insertion of the sensor element into the passage opening.
  • an exemplary embodiment of the gas sensor is preferred, which is characterized in that the through opening has a plurality of — preferably curved — depressions, at least essentially running in the longitudinal direction of the spring element.
  • the electrically conductive connecting conductors are pushed into the depressions by the sensor element and held in them by clamping. This can ensure that after the assembly of the spring element, the connecting conductors are held immovably in the depressions, so that mutual contacting of the connecting conductors after the installation — at least in the region of the spring element — is practically. table can be excluded.
  • the number of wells can range from two to eight. In a particularly preferred embodiment, a total of four depressions are provided in the through opening.
  • the spring element comprises a plurality of connection parts each having at least one electrically conductive contact surface, to which the connection conductors can be attached before or after the installation of the spring element.
  • Attachment means both a material connection, for example a weld connection, and a force-fit connection, for example a crimp connection.
  • connection parts are inserted into the through opening.
  • the connection parts are preferably designed in such a way that a form fit between the spring element and the connection parts is ensured in the assembled state of the spring element.
  • the connection parts are molded into the spring element, that is to say they are inserted into the ceramic material during the manufacture of the spring element and are thereby embedded.
  • the connection conductors can be spread apart. The insulation of the connection conductors in the area of the spring element is carried out by the spring element.
  • FIG. 1 shows a schematic longitudinal section through an embodiment of the gas sensor according to the invention
  • FIG. 4 shows a longitudinal section through a third exemplary embodiment of a connecting element.
  • FIG. 1 shows a longitudinal section of a first exemplary embodiment of a gas sensor 1, for example a lambda probe, for determining the pollutant and / or oxygen content in exhaust gases from internal combustion engines, which comprises a protective housing 3, which is formed by two sleeve-shaped housing parts 5 and 7 . These are welded to one another, only the welding points 9 being shown in FIG. 1.
  • the protective housing 3 is formed in one piece, that is to say the housing parts 5, 7 form a unit even before the gas sensor 1 is installed.
  • the housing part 7 serves to receive a planar sensor element 11, which has a connection-side section 13 and a measuring gas-side section 15. That at In this exemplary embodiment, sensor element 11 having a rectangular cross section has a plurality of contact surfaces in the region of section 13, of which only contact surfaces 17 and 19 are shown in FIG.
  • the gas sensor 1 further comprises a metal tube 21, also referred to as a metal jacket line, which is connected to the first housing part 5 of the protective housing 3, here welded, as indicated by welding points 23.
  • the metal tube 21 can also be connected to the first housing part 5 to form a unit even before the gas sensor 1 is installed.
  • a number of electrically conductive connecting conductors are arranged spaced apart from one another, which are embedded in an insulating material, for example magnesium oxide.
  • the metal tube can have up to eight connecting conductors. In this exemplary embodiment, a total of four connecting conductors are provided, of which only the connecting conductors 25 and 27 can be seen in the sectional view in FIG. 1.
  • the metal tube 21 or the connecting conductors 25, 27 are non-positively connected to the sensor element 11 by means of a connecting element 29.
  • the connecting element 29 is explained in more detail with reference to FIGS. 2 to 4.
  • Insulating bushes 31 and 33 are arranged in the interior of the first housing part 7, between which a porous sealing packing 35 is clamped.
  • the insulating bushes 31, 33 and the sealing packing 35 are introduced from the side of the second housing part 7 facing the measuring gas side section 15 of the sensor element 11 and loaded with a compressive force acting in the direction of an arrow 37. hits.
  • the insulating bush 31 lies against a circumferential annular shoulder 39 of the second housing part 7 and is supported on it, so that the insulating bushes 31, 33 and the sealing packing 35 are compressed and the sensor element 11 inserted through the longitudinal bore is held in a clamped manner.
  • the second housing part 7 is then squeezed from the outside, so that its inside diameter becomes smaller.
  • FIG. 2 shows a plan view of a first exemplary embodiment of the connecting element 29, which is formed by a spring element 41 made in one piece from ceramic material.
  • This is ring-shaped and has an essentially rectangular through opening 43 here.
  • the annular body of the spring element 41 is closed, that is to say that the wall of the ring is not slotted.
  • a plurality, here a total of four depressions 45 are made, which run essentially in the longitudinal direction of the spring element 41.
  • the depressions 45 thus lie in a plane which is substantially perpendicular to the image plane of FIG. 2.
  • the groove-like depressions 45 have a curved, here semicircular contour and serve to receive connecting conductors 25, 25 ', 27 and 27'. As can be seen from FIG.
  • the connecting conductors 25, 25 ', 27, 27' each lie in a recess 45 or are pushed into the recesses by the sensor element 11.
  • a slot 47 which runs transversely to the longitudinal extent of the through opening 43 and serves to enlarge the spring travel of the spring element 41.
  • the spring travel can with a spring element, the one Has an outside diameter of approx. 6 mm and a thickness of approx. 4.5 mm, up to 1/10 mm and above.
  • the shape of the through opening 43 can be varied and, in another exemplary embodiment, can also be circular.
  • the shape of the through opening preferably corresponds, at least essentially to the height, to the sensor element 11, which can also have, for example, a square cross section.
  • the function of the spring element 41 is explained in more detail below with the aid of an assembly process: first, the connecting conductors 25, 25 ', 27, 27' are guided or plugged through the through opening 43 of the spring element 41 and the spring element 41 is pushed as far as against the metal tube 21, see above that the end face 49 of the spring element 41 bears against the end face 51 of the metal tube 21. Then the sensor element 11 is placed on the through-opening 43 and the spring element 41 is pushed or pressed onto the sensor element 11 in the direction of the arrow 53 shown in FIG. The connecting conductors 25, 25 ', 27, 27' are pushed into their respective recess 45 and held clamped therein. By pushing the spring element 41 onto the sensor element 11, the connecting conductors are fixed and at the same time the contact between the contact surfaces of the sensor element 11, not shown in FIG. 2, and the connecting conductors is established. When pushed on, the spring element 41 is spread open.
  • the depressions 45 are designed such that the connecting conductors 25, 25 ', 27, 27' are not completely absorbed by the depressions when the sensor element 11 pushes the connecting conductors into the depressions during assembly, so that in the assembled state a force acting in the radial direction acts between the connecting conductors, the spring element and the sensor element .
  • the sensor element 11 is introduced into the through opening 43, that is to say the spring element 41 is not displaced to connect the connecting conductors to the sensor element 11, but is only held.
  • the spring element 41 it is also possible for the spring element 41 to be pushed onto the sensor element 11 in order to connect the connecting conductors to the sensor element 11 and at the same time the sensor element 11 is inserted into the through opening 43.
  • the spring element 41 can be mechanically expanded before assembly, so that when the spring element 41 is pushed onto the sensor element 11 or when the sensor element 11 is inserted into the through opening 43, practically no, or at least only very small, forces have to be applied. A relative movement of the connecting conductors arranged in the through opening 43 can be prevented by the force-free assembly.
  • FIG. 3 shows a plan view of a further exemplary embodiment of the spring element 41.
  • the same parts are provided with the same reference numerals, so that reference is made to the description of FIG. 1. Only the differences will be discussed in more detail below.
  • connection part 55 which has an electrically conductive contact surface 57.
  • a connecting conductor 25, 25 ', 27, 27' is attached to each of the connecting parts 55, for example welded on or held by means of a crimp connection, as indicated by a thickening 59.
  • the connecting parts 55 can be inserted into the through opening 43 of the ceramic spring element 41 or molded in during its manufacture.
  • the connecting conductors 25, 25 ', 27, 27' are preferably attached to the connecting parts 55 before being connected to the sensor element 11 in order to pre-damage the contact surfaces 57 and the contact surfaces of the sensor element 11, which are not shown in FIG. 3, for example as a result of excessive heat during Avoid welding the connecting leads.
  • the spring element 41 has only one through-opening 43 without depressions, so that a positive connection between the latter and the spring element 41 is achieved when the connecting parts 55 are inserted.
  • Figure 4 shows a longitudinal section of a third embodiment of the spring element 41 and a second embodiment of the connection parts 55.
  • the connection parts 55 can be inserted into the through opening 43 of the spring element 41 or can be molded into the spring element.
  • the connecting parts 55 extend through the entire through opening 43 and beyond.
  • the connecting conductors are connected to the sensor element 11 by pushing the sensor element 11 into the through opening 43.
  • the connecting conductors can be spread apart in the assembled state in order to prevent mutual contact.
  • connecting conductor 25, 25 ', 27, 27' can be connected to the sensor element very simply and therefore inexpensively by the spring element made in one piece from ceramic material.
  • the individual connecting conductors are isolated from one another by the electrically non-conductive spring element 41.

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

L'invention concerne un détecteur de gaz, notamment une sonde lambda, pour déterminer la teneur en substances polluantes et/ou en oxygène dans les gaz d'échappement de moteurs à combustion interne. Ce détecteur comporte un boîtier abritant au moins un élément détecteur, lequel présente une section côté raccordement et une section côté gaz à mesurer, et un élément de connexion qui relie à plusieurs fils d'alimentation électroconducteurs l'élément détecteur possédant plusieurs surfaces de contact électroconductrices au niveau de sa section côté raccordement. Ce détecteur de gaz est caractérisé par un élément de connexion (29) formé par un élément à ressort (41) monobloc en céramique.
EP98952545A 1997-09-13 1998-09-04 Detecteur de gaz Withdrawn EP0938669A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19740363A DE19740363A1 (de) 1997-09-13 1997-09-13 Gassensor
DE19740363 1997-09-13
PCT/DE1998/002608 WO1999014583A1 (fr) 1997-09-13 1998-09-04 Detecteur de gaz

Publications (1)

Publication Number Publication Date
EP0938669A1 true EP0938669A1 (fr) 1999-09-01

Family

ID=7842290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98952545A Withdrawn EP0938669A1 (fr) 1997-09-13 1998-09-04 Detecteur de gaz

Country Status (6)

Country Link
US (1) US6613206B1 (fr)
EP (1) EP0938669A1 (fr)
JP (1) JP2001504236A (fr)
KR (1) KR20000068861A (fr)
DE (1) DE19740363A1 (fr)
WO (1) WO1999014583A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3648381B2 (ja) * 1998-06-04 2005-05-18 日本特殊陶業株式会社 ガスセンサ及びその製造方法
DE60045025D1 (de) 1999-08-30 2010-11-11 Denso Corp Gassensor
DE10028909A1 (de) * 2000-06-10 2001-12-20 Bosch Gmbh Robert Gasmessfühler
DE10132826C1 (de) * 2001-07-06 2003-02-06 Bosch Gmbh Robert Gasmessfühler
DE10132827A1 (de) * 2001-07-06 2003-01-30 Bosch Gmbh Robert Gasmessfühler
US6754067B2 (en) * 2002-09-06 2004-06-22 Mine Safety Appliances Company Instrument assembly systems, housing and methods of mounting instrument assemblies
JP2004264262A (ja) * 2003-03-04 2004-09-24 Denso Corp セラミック素子と摺動端子との摺動接触構造
US7377149B2 (en) * 2003-03-27 2008-05-27 Robert Bosch Gmbh Sensor
US20060243027A1 (en) * 2005-04-29 2006-11-02 Nelson Charles S Package for a sensing element, retaining device for retaining the sensing element in the package, sensor, and methods of making the same
US20080206107A1 (en) * 2007-02-23 2008-08-28 Honeywell International Inc. Gas sensor apparatus for automotive exhaust gas applications
US7805992B2 (en) * 2007-03-27 2010-10-05 Honeywell International Inc. Gas sensor housing for use in high temperature gas environments
DE102007018000A1 (de) 2007-04-17 2008-10-23 Robert Bosch Gmbh Verbund aus einem hohlen äußeren und einem darin einliegenden inneren Körper
JP2009198422A (ja) * 2008-02-25 2009-09-03 Ngk Spark Plug Co Ltd ガスセンサ
EP2392920B1 (fr) * 2009-12-25 2015-02-11 NGK Insulators, Ltd. Connecteur
US9541533B2 (en) * 2013-02-08 2017-01-10 Ngk Spark Plug Co., Ltd. Gas sensor
DE102013015999A1 (de) * 2013-09-26 2015-03-26 Rmg Messtechnik Gmbh Kabelführung für einen explosionsgefährdeten Bereich
US11002700B2 (en) 2017-11-21 2021-05-11 Honeywell International Inc. High temperature gas sensor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5381191A (en) * 1976-12-25 1978-07-18 Toyota Motor Co Ltd Oxygen concentration sensor
DE2907032C2 (de) * 1979-02-23 1984-06-20 Robert Bosch Gmbh, 7000 Stuttgart Polarographischer Sauerstoffmeßfühler für Gase, insbesondere für Abgase von Verbrennungsmotoren
JPS60150449U (ja) * 1984-03-16 1985-10-05 日本碍子株式会社 酸素検知器
DE59107034D1 (de) * 1990-10-26 1996-01-18 Bosch Gmbh Robert Gasmessfühler, insbesondere zur bestimmung des sauerstoffgehaltes in abgasen von brennkraftmaschinen.
DE4204850A1 (de) 1992-02-18 1993-08-19 Roth Technik Gmbh Gehaeuse fuer einen gassensor
DE19549283A1 (de) 1995-12-22 1997-06-26 Siemens Ag Im Hochtemperaturbereich verwendbarer Sensor
DE19603379A1 (de) * 1996-01-31 1997-08-07 Bosch Gmbh Robert Gassensor
JP3625627B2 (ja) * 1996-10-14 2005-03-02 日本特殊陶業株式会社 高温下で使用されるセラミック応用電子機器及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9914583A1 *

Also Published As

Publication number Publication date
KR20000068861A (ko) 2000-11-25
JP2001504236A (ja) 2001-03-27
DE19740363A1 (de) 1999-03-18
WO1999014583A1 (fr) 1999-03-25
US6613206B1 (en) 2003-09-02

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