WO2008009533A2 - Capteur de gaz - Google Patents

Capteur de gaz Download PDF

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Publication number
WO2008009533A2
WO2008009533A2 PCT/EP2007/056121 EP2007056121W WO2008009533A2 WO 2008009533 A2 WO2008009533 A2 WO 2008009533A2 EP 2007056121 W EP2007056121 W EP 2007056121W WO 2008009533 A2 WO2008009533 A2 WO 2008009533A2
Authority
WO
WIPO (PCT)
Prior art keywords
gas
sealing member
sensor element
sensor according
gas sensor
Prior art date
Application number
PCT/EP2007/056121
Other languages
German (de)
English (en)
Other versions
WO2008009533A3 (fr
Inventor
Imke Heeren
Ulrich Eisele
Philipp Spies
Thomas Loibl
Ralf Niklaus
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 WO2008009533A2 publication Critical patent/WO2008009533A2/fr
Publication of WO2008009533A3 publication Critical patent/WO2008009533A3/fr

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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
    • 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

Definitions

  • the invention is based on a gas sensor for determining a physical property of a measurement gas, in particular the concentration of a gas component or the temperature of the measurement gas, according to the preamble of claim 1.
  • a known gas sensor of this type (DE 195 32 090 Al) has a provided with a mounting thread and a mounting sleeve, metallic housing and a rod-shaped, planar sensor element which is fixed in the housing and protrudes axially with two end portions on mutually remote housing sides of the housing , Gas-sensitive electrodes are arranged in the so-called measuring-gas-side end section of the sensor element, and contact surfaces are arranged on the so-called connection-side end section of the sensor element and are connected to the electrodes via conductor tracks. The contact surfaces are connected via contact holders or contact plug made of ceramic with guided to the sensor element leads.
  • the measuring gas side end portion is covered by a multi-walled protective tube having gas passage holes through which the sample gas reaches the gas-sensitive electrodes.
  • a sealing element enclosing the sensor element is provided, which is arranged between two ceramic moldings and axially compressed by axially pressing the ceramic moldings so that it presses on the one hand to the sensor element and on the other hand to an inner wall portion of the housing radially.
  • the axial pressing force is maintained by means of a metal cap which is caulked with its cap edge on the metal housing. The cap bottom presses the one ceramic part against the sealing member, while the other ceramic part rests against an annular shoulder formed in the housing, which constitutes an abutment.
  • the sealing member is in three parts and consists of two steatite discs and a boron nitride disc arranged in between, which are individually inserted into the housing during assembly of the gas sensor.
  • Contact plugs or contact holders which come into use on the end face on the measuring gas side and force-fit, for example, the connecting conductors onto the contact surfaces on the sensor element are known in different configurations, for example from DE 101 32 827 A1, DE 101 32 828 A1 or DE 101 32 823 C1. Structure and operation of a sensor element for measuring the oxygen concentration in the exhaust gas of an internal combustion engine is described for example in DE 199 41 051 Al.
  • Such a gas sensor used as an exhaust gas sensor or lambda probe is inserted into an exhaust pipe of an internal combustion engine and protrudes into the exhaust gas flow guided in the exhaust pipe with the measuring gas side end portion of the sensor element surrounded by a protective tube.
  • the exhaust pipe is provided with an opening in which a male thread bearing, hollow cylindrical connector is welded.
  • the gas sensor with its housing, which is provided with a sealing flange, inserted into the connector so that the bottom of the sealing flange rests on the annular end face of the connector.
  • a guided over the housing union nut is screwed with an internal thread in the external thread of the connector and presses the annular flange on the end face of the connector, so that a sealing seat of the housing is made in the connector (DE 197 39 435 Al).
  • the gas sensor according to the invention with the features of claim 1 has the advantage that only a few parts must be assembled during assembly of the gas sensor, whereby the assembly time is significantly shortened and the assembly cost is significantly reduced.
  • the assembly comprises the obstruction of the mounting element consisting of sensor element and sealing element in a sensor housing or directly in a connection piece on a sample gas tube carrying the measurement gas and establishing the axial seal between the sealing element and sensor housing or connection piece.
  • the sealing element is provided with two spaced, circumferential flanks, of which a first flank is formed on the messgas stoolen front side of the sealing element.
  • the first edge is close to a formed on the housing, circumferential first shoulder.
  • the second flank of the sealing element is overlapped gas-tight by a likewise circumferential second shoulder of the housing and thus clamped the sealing member axially against the other housing shoulder.
  • This second shoulder is made by locally heating the housing in the region of the second flank and swaging the heated area.
  • the process of local heating and compression of the housing, which is also used in the manufacture of ignition candles is extremely inexpensive.
  • the gas-tight assembly module of sealing member and sensor element is produced in a pre-assembly stage.
  • a radial flange is integrally formed according to an advantageous embodiment of the invention on the sealing member on the one hand rests on an annular shoulder of a introduced into the sample gas tube, hollow cylindrical connector and on the other hand is covered with a metallic sealing ring on which a directed to the annular shoulder axial force acts, which is produced by means of a hollow screw.
  • the sealing member is a sintered ceramic body on the sensor element, which is preferably produced by injection molding.
  • the ceramic body is prefabricated as a green compact with an axially continuous, preferably central longitudinal channel whose channel cross-section is dimensioned larger by a material shrinkage which occurs during sintering than the cross-section of the sensor element. The sintering process is then carried out with inserted into the longitudinal channel sensor element.
  • the ceramic body has a
  • Inner ceramic component surrounding sensor element which is easily flowing and soft
  • an outer ceramic component enclosing the inner ceramic component, which has high strength and thermal shock resistance.
  • This has the advantage that the inner ceramic component snugly and seamlessly adhere to the sensor element during sintering, so that a gas-tight connection between the ceramic body and the sensor element is formed.
  • the ceramic outer body sprayed on the inner ceramic component, the ceramic body has high strength and thermal shock resistance, so that it is sufficiently resistant to stone and water hammer.
  • the manufacture of the seal body in a multi-component injection molding process is production-friendly and cost-effective.
  • the sealing member extends over the terminal-side end portion of the sensor element and has means for fixing electrical connection lines on the end portion of the sensor element.
  • This design of the sealing body eliminates not only a separate contact holder for connecting the connecting lines to the sensor element, but is also a heat conduction or
  • the means for fixing the electrical connection lines can be designed in different ways. You can in the sealing member integrated spring elements that the
  • the ceramic body forming the sealing member has, in its region covering the connection-side end portion of the sensor element, a third ceramic component which has a high degree of toughness.
  • the ceramic component with the high toughness ensures a sufficient elasticity of the ceramic body in the region of the contact surfaces of the sensor element.
  • the assembly module for installation in a connection piece on a sample gas tube leading the sample gas is set in a short, metallic mounting sleeve, which has a screw thread for screwing with the connection piece and a tool engagement surface for carrying out the screw assembly.
  • the mounting sleeve can be designed as a hollow screw and the tool engagement surface may be formed as a key hexagon or elliptical or wavy key surface. Due to the short metallic mounting sleeve, which encloses preferably designed as a ceramic body with good thermal insulation properties sealing member in a small, practically limited to the installation area in the connector body region, the heat input of the reduced
  • the advantages of the temperature reduction in the Kunststoffier Scheme of the sensor element achieved with the gas-tight obstruction of the sensor element in the thermally insulating ceramic body are not nullified by the subsequent obstruction of the gas sensor in the connection piece of the sample gas tube, but remain unrestricted.
  • the temperature in the contact region of the sensor element can thus be kept relatively low overall and the cable outlet can be created in a less temperature-resistant, more cost-effective design.
  • the surface of the ceramic sealing member adjoining the mounting sleeve is kept as large as possible up to the contacting region, for which purpose the sealing member has a waisted shape in this region.
  • the volume of the preferably designed as a ceramic body sealing member can be reduced and the diameter the screw thread on the mounting sleeve thus the usual M 18 to M 14 can be reduced.
  • the volume of construction is reduced, and material costs are saved.
  • the permanently connected to the ceramic sealing member mounting sleeve of the gas sensor for installation on the sample gas tube so that no additional mounting hardware is required, which are not captive in the uninstalled state and strike during transport and handling on the ceramic seal member and can damage this ,
  • the determination of the mounting module is made by pressing the sealing member in the mounting sleeve and then caulking the mounting sleeve, wherein preferably the caulking is carried out at a temperature between 400 0 C to 800 0 C.
  • the compression takes place via a on the sealing member at the measuring gas side end portion of the sensor element end portion formed cone and a formed in the interior of the mounting sleeve counter cone, wherein the cone and counter cone are pressed together with their conical surfaces.
  • Cone and counter-cone are designed so that due to self-locking a shaking of the compression is prevented by vibrations on the sample gas tube.
  • cone and counter-cone are preferably designed such that the cone angles have an acute angle smaller than 15 °.
  • FIG. 1 shows a longitudinal section of a gas sensor with sensor housing and a mounting module built therein sensor element and sealing member
  • FIG. 2 is a perspective view of the mounting module of the gas sensor in Fig. 1,
  • FIG. 3 is a bottom view of the mounting module in the direction of arrow III in Fig. 2, 4 shows a similar view as in FIG. 3 in the green state of the sealing member, FIG.
  • FIG. 5 shows a half section of a gas sensor with a mounting module of sensor element and sealing element installed directly in the connection piece of a sample gas tube
  • FIG. 6 shows a same illustration of the gas sensor as in FIG. 5 with modified protective tube attachment
  • FIG. 7 shows an enlarged view of the detail VII in FIG. 5 with connecting leads mounted by means of a holder
  • FIG. 8 shows a detail of an end portion of the mounting module according to another
  • FIG. 9 is a plan view of the holder in Fig. 8,
  • FIG. 10 is a view similar to FIG. 8 of the mounting module according to two further and eleven embodiments,
  • FIG. 13 shows a detail of a half section of the gas sensor in FIG. 12 with a modified connection between the mounting module and the mounting sleeve, FIG.
  • FIG. 14 is a half section of the mounting sleeve in Fig. 13 with attached caulking
  • Fig. 15 are each a same view as in Fig. 13 with further modifications of the connection and 16 PHg between mounting module and mounting sleeve.
  • the gas sensor shown in section in FIG. 1 with a sensor element 11 for determining a physical property of a measuring gas serves, for example, for determining the oxygen concentration in the exhaust gas of an internal combustion engine.
  • the gas sensor can also be used for determining the concentration of nitrogen oxides in the exhaust gas or for measuring the temperature of the exhaust gas.
  • the gas sensor has a rotationally symmetrical metallic housing 10 in which the planar sensor element 11 which is rod-shaped in the exemplary embodiment is guided.
  • the sensor element 11 emerges from the housing 10 with a measuring-gas-side end section 111 and a connection-side end section 112 on end faces of the housing 10 facing away from one another.
  • the test gas exposable measuring gas end portion 111 carries gas-sensitive in a known manner
  • a so-called outer electrode 12 arranged on the surface of the sensor element 11 is indicated schematically in FIGS. 1 and 2.
  • the protective tube 13 is provided with Gas thoroughly Stammsöffhungen 14 through which the sample gas or exhaust gas can reach the sensor element 11.
  • the protective tube 13 is fixedly connected to the housing 10, wherein in the illustrated embodiment, the protective tube 11 is integral with the housing 10.
  • the housing 10 In an exhaust pipe leading the exhaust pipe of an internal combustion engine or an internal combustion engine - the housing 10 is provided with a mounting winch 15 and a mounting hexagon 16.
  • a sealing member 17 located in the housing 10 encloses the sensor element 11 in sections and seals it against the housing 10, so that no measuring gas can reach the connection side of the gas sensor from the side of the measuring gas.
  • the connection-side end portion 112 of the sensor element 11 carries in a known manner contact surfaces, which serve for connecting the gas sensor to an evaluation. Of the contact surfaces are in Fig. 1, two contact surfaces 18, 19 indicated schematically. The contact surfaces are connected via conductor tracks, not shown here with the electrodes in the measuring gas side end portion 111.
  • the sealing member 17 is gas-tightly connected in a pre-assembly stage with the sensor element 11 to a mounting module 30 (FIG. 2), which is axially inserted into the housing 10 and fixed gas-tight therein.
  • the sealing member 17 is a rotationally symmetrical
  • Ceramic body 20 which is produced as an injection molded part by injection molding and sintered onto the sensor element 11, so that a solid, gap and gap-free, gas-tight connection between the sensor element 11 and the ceramic body 20 is made.
  • the ceramic body 20 encloses the portion of the sensor element 11 which is inserted in the housing 10 and extends with a body portion reduced in diameter over the measuring gas side end portion 111 of the sensor element 11 protruding from the housing 10.
  • the ceramic body 20 integrated spring elements 21, 22 are formed, which serve for clamping connection leads to the contact surfaces 18, 19 of the sensor element 11.
  • the number of formed, integrated spring elements 21, 22 corresponds to the number of existing contact surfaces 18, 19 on the sensor element 11.
  • the ceramic body 20 is produced in a multi-component injection molding of two or optionally three ceramic components (FIGS. 2 and 3).
  • An inner ceramic component 201 that immediately surrounds the sensor element 11 is soft and light fluently.
  • An outer component 202 enclosing the inner ceramic component 201 has high strength and thermal shock resistance.
  • An optional third ceramic component 203 (FIG. 2) provided in the region covering the terminal-side end portion 112 of the sensor element 11 has a high toughness.
  • the ceramic body 20 produced from these two or three ceramic components in the multi-component injection molding process as green body 23 is provided with a central, axially continuous longitudinal channel 24 (FIG. 4).
  • the rectangular in cross-section to the rod-shaped, planar sensor element 11 channel cross-section of the longitudinal channel 24 is dimensioned by a material shrinkage during sintering larger than the cross section of the sensor element 11, so that after insertion of the sensor element 11 in the longitudinal channel 24, a circumferential gap 25 between the sensor element 11th and green body 23 remains, as shown in Fig. 4.
  • the inner ceramic component 201 shrinks onto the sensor element 11 and snuggles against the sensor element 11 in a gap-free and gapless manner (FIG. 3) that the mounting module 30 is gas-tight.
  • the outer ceramic component 202 gives the ceramic body 20 a sufficiently high resistance to stone and water hammer and the toughness of the third ceramic component 203 ensures a damage-free clamping of the connection conductors on the contact surfaces 18, 19 by the ceramic body 20 formed on the spring elements 21, 22 with sufficiently high pressure ,
  • flanks 26, 27 are formed on the ceramic body 20 at an axial distance from each other, which rotate on the ceramic body 20 and may have a flat, a concave or a convex contour (FIGS. 1 and 2).
  • the one flank 26 is formed on the end face of the ceramic body 20 which is close to the measuring gas side end portion 111, and the other flank 27 on the transition to the reduced diameter body portion, which surrounds the connection-side end portion 112 of the sensor element 11.
  • the flank 26 is in a form-fitting manner on an annular shoulder 28 formed in the housing 10.
  • the other flank 27 is overlapped by a circumferential second shoulder 29 of the housing 10 such that on the one hand the flank 26 and the shoulder 28 and on the other hand the flank 27 and the shoulder 29 are pressed gas-tight.
  • This axial strain of the ceramic body 20 between the shoulders 28, 29 in the housing 10 is achieved in that after insertion of the mounting module 30 of ceramic body 20 and sensor element 11 in the housing 10 such that the flank 26 is positively supported on the shoulder 28, the Housing 10 in the region of the second edge 27 of the ceramic body 20, ie at the housing end, is locally heated, for example by inductive heating, and the housing 10 is compressed in the heated area.
  • the self-gas-tight mounting module 30 is also gas-tight in the housing 10 in a simple assembly process.
  • the gas sensor shown in half section in FIG. 5 a housing is dispensed with and the assembly module 30 consisting of the sensor element 11 and the sealing member 17 'sintered as ceramic body 20 is installed directly in a measuring gas tube 31 carrying the measuring gas.
  • the elimination of the metallic housing not only means a manufacturing advantage, but also reduces the heat absorption of the sample gas tube 31.
  • the sample gas pipe 31 has a measuring opening 32 which is enclosed by a hollow cylindrical connecting piece 33.
  • the connecting piece 33 is designed in one piece with the sample gas pipe 31.
  • the connecting piece 33 can also be used as a separate component in the measuring opening 32 and welded to the pipe wall of the sample gas pipe 31.
  • the mounting module 30 is inserted into the connecting piece 33 such that the measuring gas side end portion 111 of the sensor element 11 projects into the interior of the sample gas pipe 31.
  • the partially received in the connector 33 sealing member 17 ' is sealed against the inner wall of the connecting piece 33.
  • a radial flange 34 is integrally formed on the sealing member 17 'and ceramic body 20 having a the connection-side end portion 112 of the sensor element 11 facing radial edge 341, which is perpendicular to the sealing member axis, and facing away from it, the measuring gas side end portion 111 facing oblique edge 342 , which is cone-shaped.
  • the connecting piece 33 has a peripheral annular shoulder 35 upstream of the measuring opening 32, which is adapted to the inclined flank 342 of the radial flange 34 and thus has a funnel-shaped form.
  • the seal member 17 ' is located on the inclined shoulder 342 of the radial flange 34 on the annular shoulder 35 and protrudes with a protruding into the interior of the sample gas pipe 31 inside.
  • a metallic sealing ring 36 is placed on the radial edge 34.
  • a sealing member 17 'surrounding hollow screw 37 which is bolted to an external thread 38 in a formed on the connector 33 female thread 39, presses with its annular end face the sealing ring 36 on the radial edge 341 on the radial flange 34 and presses the radial flange 34 with the
  • a central recess 42 is introduced into the sealing element 17 'from its end remote from the measurement gas, releasing the contact surfaces 18, 19 and thus forming them is that after insertion of the connecting conductor into the recess 42, the connecting conductors are pressed in the base of the recess 42 on the contact surfaces 18, 19.
  • the contact surface 19 is located on the thereof
  • a locking receptacle for a connecting leads holding holder is provided, which is designed in the embodiment of FIGS. 5 and 6 as a circumferential locking groove 43. Holder and connecting lines are illustrated in the detail VII in FIG. 5 enlarged in FIG. 7 and are described in detail below.
  • the gas sensor shown in half section in Fig. 6 is substantially the same structure as the gas sensor described in Fig. 5, so that the same components are provided with the same reference numerals.
  • the gas sensor in FIG. 6 differs only in the connection of the protective tube 41 to the sealing member 17 '.
  • the protective tube 41 is not crimped as in Fig. 5 to the sealing member 17 ', but tightened by the axial contact pressure of the union nut 37 between the oblique shoulder 342 on the radial flange 34 of the sealing member 17' and formed on the connector 33 annular shoulder 35.
  • connection lines 44 fixed to the contact surfaces 18, 19 at the connection-side end section 112.
  • the leads 44 are spaced from a holder 46 made of a temperature resistant thermoplastic or thermoset, spaced from its line end, e.g. by injecting the holder 46 to the connecting line 44, taken.
  • the cable ends are formed to contact eyelets 45.
  • the holder 46 is formed so that it engages over the front side of the sealing member 17 'on its outer circumference and in the latching groove 43 there existing can be clipped.
  • the contact lugs 45 are inserted so far on the connecting lines 44 in the recess 43 that they are between the contact surfaces 18, 19 and the sealing member 17 'are clamped.
  • the sealing member 17 ' projects beyond the connection-side end portion 112 of the sensor element 11 and has a locking receptacle 47 for a holder 47 in the Kochsteh Kunststoff the still existing recess 42 arranged upstream locking groove 48 for clipping of the holder 47.
  • the holder 47 which can be seen in plan view in FIG. 9, in turn grips the connection conductors 44 at a distance from their line end, and the line ends are in turn formed into contact loops 45.
  • the holder 47 has two diametrically arranged spring elements 49 which engage in the latching groove 48 on the sealing member 17 '.
  • the sealing member 17 ' which in turn is provided with a recess 42, protrudes beyond the connection-side end portion 112 of the sensor element 11 and has a recess 42 for locking a conical holder 50 adjoining, to the end of the sealing member 17 'toward widening funnel 51, which has an adapted to the cone of the holder 50 funnel opening.
  • the holder 50 is in turn molded onto the connection lines 44 at a distance from the conductor ends, and the conductor ends of the connection lines 44 are in turn formed as contact eyelets 45.
  • the sealing member 17 'designed as a ceramic body 20 is configured identically as in FIG. 8, with the difference that the contact surfaces 18, 19 release on the connection-side end portion 112 of the sensor element 11 Recess 42 'has a larger clear diameter.
  • the locking receptacle for a holder 52 is arranged on the inner wall of the protruding region of the sealing member 17 'in turn as a recess 42' upstream locking groove 48.
  • the molded onto the connecting lines 44 holder 52 has axial projecting webs 521, from each of which a spring element 53 protrudes from electrically conductive material and is directed radially inwardly towards the end portion 112 of the sensor element 11.
  • the spring elements 53 are injected into the holder 52 and each contacted with one of the overmolded connecting lines 44.
  • the holder 52 like the holder 47 in FIGS. 8 and 9, has two spring webs 54 which lock the holder 52 snapped into the annular groove 48 and inserted into the recess 42 'with the webs 521 against axial withdrawal from the sealing member 17'.
  • the spring elements 53 connected to the line ends of the connection lines 44 are not injected into the holder 52 but are inserted into the holder composed of two half-shells and clamped between the half-shells.
  • the gas sensor shown as a further exemplary embodiment in FIG. 12 in turn has the mounting module 30, which in a pre-assembly stage consists of the connection of sensor element 11 and
  • the sealing member 17 is in turn a rotationally symmetrical ceramic body 20, which is produced as an injection molded part by injection molding and sintered onto the sensor element 11, so that a solid, gap and gap-free, gas-tight connection between the sensor element 11 and the ceramic body 20 exists.
  • the ceramic body 20 in turn extends over the entire sensor element 11 with the exception of the measuring gas ausique, measuring gas side end portion 111.
  • the ceramic body 20 is in turn made in a multi-component injection molding of the two ceramic components 201 and 202, wherein the inner, immediately the sensor element 11th surrounding ceramic component 201 ensures sufficient electrical insulation and the outer ceramic component 202 enclosing the inner ceramic component 201 offers high mechanical strength for protection against assembly forces, stone chipping and thermal shock.
  • the measuring gas side end portion 111 of the sensor element 11 facing the end portion of the ceramic body 20 is designed as a cone 55 which tapers towards the end of the ceramic body 20 and at the tapered cone end via radially extending shoulders 56, for example, a circumferential radial shoulder 56, to the outer diameter of the Ceramic body 20 drops.
  • the cone 55 is designed so that its cone angle is an acute angle less than 15 °.
  • each recess 42 is again provided in the end section of the ceramic body 20 facing away from the cone 55, which recesses are introduced from the free front end of the ceramic body 20.
  • locking grooves 48 are provided in the contact surface 18 and 19 opposite wall of the ceramic body 20.
  • a contact spring 57 is inserted in each recess 42.
  • Each contact spring 57 is designed to be U-shaped at the end and engages with its free spring leg in the latching groove 48, so that the contact spring 57 is secured against removal. Due to the spring tension between the two U-legs, the other spring leg presses against the contact surface 18 or 19.
  • each contact spring 57 is electrically and mechanically firmly connected to a connecting line 44.
  • the junction of the contact spring 57 and connecting cable 44 are located in a contact spring holder 58 made of temperature-resistant plastic, which is placed on the front side of the ceramic body 20 and held by means of a crimped on the ceramic body 20 cuff 59.
  • the intermediate region between the cone 55 and the end portion of the ceramic body 20 covering the contacting region of the sensor element 11 is designed to be waisted in order to enlarge the body surface.
  • a rib structure or a simple rectangular geometry can be provided.
  • the mounting module 30 is fixed in a short, metallic mounting sleeve 60.
  • the mounting sleeve 60 has a screw thread 61 and a horrangriff Structure 62.
  • the latter can be designed, for example, as a key hexagon, as shown in FIGS. 12 to 16, or as an elliptical or wavy key surface.
  • the fixing of the mounting module 30 is effected by pressing the sealing member 17 "forming ceramic body 20 in the mounting sleeve 60 and then caulking the mounting sleeve 60.
  • the mounting sleeve 60 adapted to the cone 55 of the ceramic body 20 counter-cone 63, which has a same cone angle Like the cone 55 on the ceramic body 20, so that when inserting the mounting module 30 in the mounting sleeve 60 cone 55 and counter cone 63 are flush with each other.
  • the mounting module 30 in the mounting sleeve 60 of the ceramic body 20 is first pressed in the mounting sleeve 60, wherein the Cone 55 is inserted deeper into the counter-cone 63.
  • the mounting sleeve 30 is caulked on the ceramic body 20, whereby caulked lugs 64 are formed, which press on the shoulder 56 formed on the ceramic body 20 at the end of the cone 55.
  • the caulking preferably takes place at elevated temperatures between 400 0 C and 800 0 C, d amit when heating the gas sensor in the hot sample gas tube, the caulking is not solved.
  • a resulting from the different coefficients of thermal expansion of ceramic body 20 and metallic mounting sleeve 60 reduction of Verstemmkraft is not critical, since the actual fixing of the mounting module 30 in the mounting sleeve 60 via cone 55 and counter-cone 63 takes place.
  • the protective tube 41 is fixed, which is formed in the embodiment of FIG. 12 by a double protective tube, consisting of an inner protective tube 411 and an outer protective tube 412, which are arranged concentrically to the sensor element 11 and the measuring gas side end portion 111 of the sensor element 11 overlap.
  • the double protection tube has in a known manner Gas toughsöffhungen 14, through which the sample gas reaches the measuring gas side end portion 111 of the sensor element 11.
  • the caulking of the mounting sleeve 60 after pressing of ceramic body 20 and mounting sleeve 60 via cone 55 and counter-cone 63 is then carried out on the free end face of the ceramic body 20 with splitting off of lugs 64 of an integrally formed on the mounting sleeve 60 annular web 66, which then at the front of the Ceramic body 20 abut.
  • the mounting sleeve 60 is shown in front of its assembly in the mounting module 30 in half section.
  • a caulking tool 65 is sketched in half section, which attaches to the integrally formed on the mounting sleeve 60 annular web 66 and from this the caulked nose 64 is separated and folded over to the end face of the ceramic body 20, as shown in Fig. 13.
  • gas sensors is dispensed with the formation of a counter-cone 63 in the mounting sleeve 60 and the counter-cone 63 formed on a clamping ring 67 which is inserted between the cone 55 on the ceramic body 20 and the mounting sleeve 60 ,
  • the cone 55 is formed so that it tapers towards the measuring gas side end of the ceramic body 20, while in
  • the cone 55 is designed so that it widens steadily in diameter to the measuring gas side end of the ceramic body 20 out.
  • the caulked lugs 64 are in the embodiment of FIG. 15 on the clamping ring 67 and in the embodiment of FIG. 16 réellestemmt on the free end face of the ceramic body 20.
  • the caulked lugs 64 are, as described above, in turn bent from the integrally formed on the mounting sleeve 60 annular web 66.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • Measuring Oxygen Concentration In Cells (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

L'invention concerne un capteur de gaz servant à déterminer une propriété physique d'un gaz de mesure, en particulier la concentration d'un composant du gaz de mesure ou la température du gaz de mesure. Ce capteur de gaz comprend un élément sensible (11) pourvu d'une section d'extrémité côté gaz de mesure (111) et d'une section d'extrémité côté raccordement (112), ainsi qu'un élément d'étanchéité (17) entourant l'élément sensible (11), cet élément d'étanchéité (17) servant à séparer les sections d'extrémité côté gaz de mesure et côté raccordement (111, 112) de manière étanche au gaz de mesure. Selon l'invention, pour réduire les coûts de fabrication et le temps de montage, l'élément d'étanchéité (17) est associé à l'élément sensible (11) de manière étanche au gaz sous la forme d'un module de montage (30). L'élément d'étanchéité (17) est de préférence un corps en céramique (20) produit par un procédé de moulage par injection et le module de montage (30) est formé par agglomération par frittage de ce corps céramique (20) sur l'élément sensible (11).
PCT/EP2007/056121 2006-07-19 2007-06-20 Capteur de gaz WO2008009533A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102006033407 2006-07-19
DE102006033407.8 2006-07-19
DE102007025626.6 2007-06-01
DE102007025626A DE102007025626A1 (de) 2006-07-19 2007-06-01 Gassensor

Publications (2)

Publication Number Publication Date
WO2008009533A2 true WO2008009533A2 (fr) 2008-01-24
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WO2017102279A1 (fr) * 2015-12-16 2017-06-22 Continental Automotive Gmbh Capteur destiné à être utilisé dans une ligne d'échappement

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Publication number Priority date Publication date Assignee Title
DE102009000463A1 (de) 2009-01-29 2010-08-05 Robert Bosch Gmbh Verfahren zur Herstellung eines Verbauungsmoduls eines Gassensors
DE102011078311A1 (de) 2011-06-29 2013-01-03 Robert Bosch Gmbh Sensor zur Bestimmung einer physikalischen Eigenschaft eines Mediums
CN111624321B (zh) * 2020-06-08 2021-06-15 深圳延浩科技有限公司 一体化多接口多参数水质分析仪

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DE19707458A1 (de) * 1997-02-25 1998-08-27 Bosch Gmbh Robert Meßfühler und Verfahren zu dessen Herstellung
DE19739435A1 (de) * 1997-09-09 1999-03-11 Bosch Gmbh Robert Meßfühler
DE19850959A1 (de) * 1998-11-05 2000-05-11 Bosch Gmbh Robert Meßfühler und Verfahren zu seiner Herstellung
DE102005016861A1 (de) * 2004-04-13 2006-01-05 Denso Corp., Kariya Gassensor

Patent Citations (4)

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DE19707458A1 (de) * 1997-02-25 1998-08-27 Bosch Gmbh Robert Meßfühler und Verfahren zu dessen Herstellung
DE19739435A1 (de) * 1997-09-09 1999-03-11 Bosch Gmbh Robert Meßfühler
DE19850959A1 (de) * 1998-11-05 2000-05-11 Bosch Gmbh Robert Meßfühler und Verfahren zu seiner Herstellung
DE102005016861A1 (de) * 2004-04-13 2006-01-05 Denso Corp., Kariya Gassensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017102279A1 (fr) * 2015-12-16 2017-06-22 Continental Automotive Gmbh Capteur destiné à être utilisé dans une ligne d'échappement

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WO2008009533A3 (fr) 2008-06-05

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