CN110873747A - Sensor for sensing at least one property of a measurement gas in a measurement gas chamber - Google Patents
Sensor for sensing at least one property of a measurement gas in a measurement gas chamber Download PDFInfo
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- CN110873747A CN110873747A CN201910826551.6A CN201910826551A CN110873747A CN 110873747 A CN110873747 A CN 110873747A CN 201910826551 A CN201910826551 A CN 201910826551A CN 110873747 A CN110873747 A CN 110873747A
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- sensor
- spring clip
- contact
- protective sleeve
- measurement gas
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- 230000001681 protective effect Effects 0.000 claims abstract description 63
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- 238000003825 pressing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 46
- 239000007784 solid electrolyte Substances 0.000 description 18
- 239000000919 ceramic Substances 0.000 description 15
- 238000011161 development Methods 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000007667 floating Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
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- 229910000510 noble metal Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 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
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 229910052623 talc Inorganic materials 0.000 description 1
Images
Classifications
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- 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
-
- 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
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
- G01K13/024—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
Abstract
The invention relates to a sensor (10) for sensing at least one property of a measurement gas in a measurement gas chamber, in particular for sensing a component of a gas component in the measurement gas or a temperature of the measurement gas. The sensor (10) includes a sensor element (20), a housing (12), and a protective sleeve (42). A housing (12) is at least partially surrounded by the protective sleeve (42) and has a longitudinal bore (16) in which the sensor element (20) is arranged. The sensor (10) also has a contact holder (44) and a spring clip (46). A contact holder (44) is configured to hold the sensor element (20). A spring clip (46) is configured for securing the contact portion holder (44). A spring clip (46) is arranged between the housing (12) and the protective sleeve (42) in an elastically deformable manner such that the spring clip (46) exerts a first pretensioning force on the contact retainer (44).
Description
Technical Field
The invention relates to a sensor for sensing at least one property of a measurement gas in a measurement gas chamber.
Background
Various sensor elements and methods for sensing at least one property of a measurement gas in a measurement gas chamber are known from the prior art. In principle, this can involve measuring any physical and/or chemical property of the gas, wherein one or more properties can be sensed. The invention is described below, in particular, on the basis of the qualitative and/or quantitative sensing of the component of the gas component of the measurement gas, in particular on the basis of the sensing of the oxygen component in the measurement gas. The oxygen component may be sensed, for example, in the form of partial pressure and/or in the form of a percentage. However, alternatively or additionally, other properties of the measurement gas, such as the temperature, may also be sensed.
Such a sensor element can be configured, for example, as a so-called lambda sensor, as described by Konrad Reif (editor): sensoren im Krafffahrzeug, 1 st edition 2010, page 160-165 is known. By means of a broadband lambda sensor, in particular a planar broadband lambda sensor, for example, the oxygen concentration of the exhaust gas can be determined over a large area and the air/fuel ratio in the combustion chamber can be deduced therefrom. The air ratio λ describes the air-fuel ratio.
Sensors having ceramic sensor elements based on the use of a solid body for determining its electrolytic properties, i.e. based on its ion-conducting properties, are known from the prior art. These solids can be, in particular, ceramic solid electrolytes, such as zirconium dioxide (ZrO)2) In particular yttrium-stabilized zirconium dioxide (YSZ) and -doped zirconium dioxide (ScSZ), which may contain aluminum oxide (Al)2O3) And/or silicon oxide (SiO)2) A small amount of additive (b).
Such sensors typically have a seal. The seal is made of a material comprising a mixture of boron nitride and a component of an oxide ceramic, such as talc. Such sensors are described, for example, in DE 10009597 a1, DE 19532090 a1 and DE 19714203 a 1. The sealing element is of disk-shaped design. The materials described here lead to a good sealing action, in particular with respect to the fuel, and a high thermal stability.
Furthermore, a contact holder is provided in such a sensor, which holds the sensor element in the longitudinal bore. The contact holder is designed in one or more parts, for example in two parts, and has a clip or is fixed inside a protective sleeve of the sensor.
Although the sensors known from the prior art have advantages, they still have an improvement potential. In the first-mentioned variant of the two-part contact holder, the connection process of the contact holder and the sensor element is complicated and expensive. In the second variant mentioned, in which the one-piece contact holder is fixed in the protective sleeve, the orientation of the contact holder can be varied and can be positioned, joined and visible only by special machines in terms of manufacturing technology. Manufacturing tolerances in the pressing of the sensor element into the sensor housing result in the contact holder not being able to be positioned in an optimal position. However, the changed orientation of the contact holder causes a changed orientation of the sensor element, so that the sensor element may not be located in its nominal position, which may lead to measurement inaccuracies.
Disclosure of Invention
The invention therefore proposes a sensor for sensing at least one property of a measurement gas in a measurement gas chamber, which sensor avoids the disadvantages of the known sensors at least to a large extent. In particular, the joining process of the contact holder and the sensor element is simplified in the sensor, wherein the contact holder can also be oriented more precisely.
The sensor according to the invention for sensing at least one property of a measurement gas in a measurement gas chamber, in particular for sensing a component of a gas component in the measurement gas or a temperature of the measurement gas, comprises a sensor element, a housing and a protective sleeve. The housing is at least partially surrounded by a protective sleeve and has a longitudinal bore in which the sensor element is arranged. Furthermore, the sensor has a contact holder and a spring clip. The contact holder is configured to hold the sensor element. The spring clip is configured for securing the contact portion holder. The spring clip is arranged between the housing and the protective sleeve in an elastically deformable manner such that the spring clip exerts a first pretensioning force on the contact holder.
The contact holder is designed for pushing onto the sensor element in such a way that a reliable connection, i.e. an electrical contact connection, can be established between the contact pad located on the sensor element and the contact clip located in the contact holder. The spring clip is formed in the housing between the contact holder and the housing or around the contact holder and is supported on the housing wall.
When the sensor is assembled, the sensor element is arranged in the contact holder and subsequently in the longitudinal bore of the housing. More precisely, the contact retainer on the cable harness is plugged onto the sensor element pressed into the housing when the sensor is assembled. The contact holder is surrounded by a spring clip. The spring clip is arranged, for example, in the protective sleeve and the protective sleeve is pushed onto the housing with the sensor element. Here, the spring clip is compressed and deformed between the protective sleeve and the housing. The biasing movement presses the spring clip inwardly against the contact holder so that the contact holder is fixed in its position. In this way, the contact part holder is fixed and correctly oriented in one step during assembly.
Among the sensor elements, one can be a sensor element for a lambda sensor, as described by Konrad Reif (editor): sensoren im Krafffahrzeug, 1 st edition 2010, page 160-165 is known. The sensor element has a solid electrolyte and two electrodes separated from each other by the solid electrolyte. The solid electrolyte may be constructed from one or more solid electrolyte layers.
Within the framework of the present invention, a solid electrolyte or a solid electrolyte layer is generally understood to be an object or object having electrolytic properties, i.e. having ion-conducting properties. In particular, it may relate to ceramic solid electrolytes, such as zirconium dioxide (ZrO)2) In particular yttrium-stabilized zirconium dioxide (YSZ) and -doped zirconium dioxide (ScSZ), which may contain aluminum oxide (Al)2O3) And/or silicon oxide (SiO)2) A small amount of additive (b). This also includes the starting materials of the solid electrolyte and therefore also the construction as so-called green or brown pieces (braigling), which do not become solid electrolytes until after sintering. The solid electrolyte can be designed in particular as a solid electrolyte layer or as a plurality of solid electrolyte layers.
Within the framework of the present invention, an electrode is generally understood to be an element which is able to contact the solid electrolyte in such a way that an electric current can be maintained through the solid electrolyte and the electrode. Accordingly, the electrode may comprise an element on which ions may be inserted into and/or extracted from the solid electrolyte. Typically, the electrodes comprise noble metal electrodes which can be applied to the solid electrolyte as cermet electrodes or can be connected to the solid electrolyte in another way, for example. A typical electrode material is a platinum cermet electrode. In principle, however, other noble metals, such as gold or palladium, can also be used.
In one embodiment, the longitudinal bore extends along a longitudinal extension direction, wherein the first pretensioning force acts in a direction substantially perpendicular to the longitudinal extension direction. Thus, radial centering of the contact portion holder is achieved.
In one embodiment, the spring clip exerts the first pretensioning force point-wise on the contact holder. The contact holder can thereby be of smaller design and still be reliably fixed in its position.
In a further development, the housing has a first stop face and the protective sleeve has a second stop face, wherein the first stop face and the second stop face are designed to elastically deform the spring clip when the protective sleeve is mounted on the housing. The stop face prevents the spring clip from sliding during installation so that the orientation is accurate.
In one embodiment, the first stop surface is an axial stop surface. Alternatively or additionally, the second stop surface is an axial stop surface. This allows orientation and fixing by simple axial movement of the protective sleeve and the housing towards each other.
In one embodiment, the spring clip is designed as a sleeve with a slot. Preferably, the sleeve is slightly wave-shaped. This allows a reliable and positionally correct fastening of the contact holder by means of a component which is simple and cost-effective to produce.
Here, the slots may extend from opposite longitudinal ends of the sleeve in an alternating manner parallel to the longitudinal axis of the sleeve. This provides a stable spring clip which can be elastically deformed uniformly.
In a development, the spring clamp is fixed to the protective sleeve. This prevents unintentional sliding of the spring clip.
In one embodiment, the spring clip is fastened to the protective sleeve by means of welding or a press seam (Verstemmen). This prevents unintentional sliding of the spring clamp in a simple and cost-effective manner.
In a development, the spring clip has a spring tongue which is designed to press onto the contact holder. The spring tongue simplifies the assembly and ensures centering of the contact holder.
In a further development, a contact spring is arranged between the contact holder and the sensor element, wherein the contact spring exerts a second prestressing force on the sensor element. The second pre-tightening force reduces the first pre-tightening force, so that assembly is simplified.
The contact spring can be made of an electrically conductive material, such as metal, and can thus be used for electrical contacting of the sensor element.
In one embodiment, the contact spring is of arcuate design. When the sensor element is pushed between the arches, the arches are pushed apart relative to each other, so that the sensor element is centered. Such arcuate contact springs can be produced cost-effectively.
In a development, the spring clip is configured for centering the contact holder in the longitudinal bore or the outer protective sleeve. This enables orientation according to the nominal position.
In a further development, the spring clip supports the contact holder in a floating manner. This is achieved by the increased inner and outer diameter of the spring clip serving as a positioning unit compared to conventional sensors.
In a development, the spring clip has at least one hook-shaped or claw-shaped first projection which is designed to fix the spring clip in the protective sleeve, wherein the spring clip also has at least one hook-shaped or claw-shaped second projection for fixing the contact retainer.
Drawings
Further optional details and features of the invention result from the following description of a preferred embodiment, which is schematically illustrated in the drawings.
The figures show:
figure 1 is a cross-sectional view of a sensor according to the invention according to a first embodiment,
figure 2 is a perspective view of a spring clip according to a first embodiment,
figure 3 is a cross-sectional view of a sensor according to the invention according to a second embodiment,
figure 4 is an exploded view of a sensor according to a third embodiment,
FIG. 5 is a cross-sectional view of a sensor according to a third embodiment, an
Fig. 6 is a cross-sectional view of a sensor according to a fourth embodiment.
Detailed Description
Fig. 1 shows a cross-sectional view of a sensor 10 according to a first embodiment of the invention for sensing at least one property of a measurement gas in a measurement gas chamber, in particular for sensing a component of a gas component in the measurement gas or a temperature of the measurement gas. The sensor 10 may be used, inter alia, to verify a physical and/or chemical property of a measurement gas, wherein one or more properties may be sensed. The invention is described below with particular reference to the qualitative and/or quantitative sensing of the gas composition of the measurement gas, in particular with reference to the sensing of the oxygen component in the measurement gas. The oxygen component may be sensed, for example, in the form of a partial pressure and/or in the form of a percentage. However, in principle other types of gas components, such as nitrogen oxides, hydrocarbons and/or hydrogen, can also be sensed. However, alternatively or additionally, other properties of the measurement gas may also be sensed. The invention can be used in particular in the field of vehicle technology, whereby the measurement gas chamber can be in particular an exhaust gas line of an internal combustion engine and the measurement gas, in particular exhaust gas.
The sensor 10 has a housing 12. The housing 12 may be, for example, a metal housing. The housing 12 has a thread 14 as a fastening element for installation in a wall of a measurement gas chamber (not shown in detail). The housing 12 has a longitudinal bore 16. The longitudinal bore 16 extends along a longitudinal axis or longitudinal extension direction 18. The longitudinal bore 16 has a shoulder-shaped annulus. The annular surface adjoins the end face of the housing facing the measurement gas chamber. A protective tube assembly is fixed, for example welded, to the end face end. The protective tube assembly has at least one protective tube and preferably a plurality of protective tubes. The protective tube assembly has, for example, an outer protective tube and at least one inner protective tube arranged therein. The protective tube assembly can have, for example, two inner protective tubes which are arranged concentrically to one another. Both the outer protective tube and the inner protective tube have inlet and outlet openings, not shown in detail, through which the measurement gas can enter into or exit from the inner chamber of the inner protective tube.
The sensor 10 also has a sensor element 20 for sensing at least one property of the measurement gas. The sensor element 20 is of planar design. The sensor element 20 extends in a longitudinal extension direction 22. The sensor element 20 has a joint-side end 24 and a measurement-gas-side end 26. The measurement gas end 26 is opposite the connection-side end 24, as viewed in the longitudinal extension direction 22. The terminal-side end 24 is designed with an electrical terminal 28 of the sensor 10 for electrical contacting. The measurement gas side end 26 is configured for exposure to the measurement gas in the interior of the inner protective tube.
On the shoulder-shaped ring surface, for example, a metal sealing ring (not shown in detail) is present, on which a measuring gas-side ceramic shaped part 30 is placed. The measuring gas-side ceramic shaped part 30 has a continuous measuring gas-side gap 32 running in the direction of the longitudinal bore 16, through which the sensor element 20 extends. At a distance from the measurement gas-side ceramic former 30, a joint-side ceramic former 34 is also arranged in the longitudinal bore 16. The joint-side ceramic former 34 likewise has a centrally arranged and continuous joint-side opening 36 running in the direction of the longitudinal bore 16, through which the sensor element 20 extends. The measurement gas-side slit 32 of the measurement gas-side ceramic molded part 30 and the joint-side slit 36 of the joint-side ceramic molded part 34 run in alignment with each other.
Between the measurement gas-side ceramic form 30 and the joint-side ceramic form 34 there is at least one seal 38 and preferably a plurality of seals 38, such as three seals 38. Of course, more or fewer seals may be provided depending on the application.
The terminal-side end 24 of the sensor element 20 is electrically contacted by a terminal contact 40, which likewise projects from the housing 12 or the cable assembly in a protective sleeve 42 of the sensor 10. The connector contact 40 is in contact with a contact plug, not shown in detail, provided with a connecting cable.
The sensor 10 also has a protective sleeve 42. The housing 12 is at least partially surrounded by a protective sleeve 42. The protective sleeve is made of metal, for example. The sensor 10 also has a contact holder 44 and a spring clip 46. The contact holder 44 is configured to hold the sensor element 20. The contact holder 44 surrounds the sensor element 20. In the mounted state, the contact retainer 44 is present inside the protective sleeve 42. The spring clip 46 is configured to secure the contact portion holder 44. As shown in fig. 1, the spring clip 46 is arranged between the housing 12 and the protective sleeve 42 in an elastically deformable manner such that the spring clip 46 exerts a first pretensioning force on the contact holder 44. In this way the contact portion holder 44 is secured and centred.
Fig. 2 shows a perspective view of the spring clip 46 in a first embodiment. In the first embodiment, the spring clip 46 is configured as a cage or sleeve 48 having a slot 50. The sleeve 48 is substantially rotationally symmetrical about a longitudinal axis 52. The sleeve 48 has two longitudinal ends 54, 56, which are opposite, seen along the longitudinal axis 52. The slots 50 extend parallel to the longitudinal axis 52 from opposite longitudinal ends 54, 56 in an alternating sequence. Viewed along the longitudinal axis 52, the sleeve 48 is corrugated in an intermediate section 60 with at least one recess 58 extending radially inward with respect to the longitudinal axis 52.
As shown in fig. 1, the housing 12 has a first stop surface 62. The protection sleeve 42 has a second stop surface 64. The first stop surface 62 and/or the second stop surface 64 are axial stop surfaces. The axial stop faces 62, 64 are oriented parallel to one another and perpendicular to the longitudinal extension direction 18, 22. The first and second stop surfaces 62, 64 are configured to elastically deform the spring clip 46 when the protective sleeve 42 is installed on the housing 12, as described in detail below.
When the sensor 10 is assembled, the sensor element 20, which is arranged and fixed in the longitudinal bore 16 of the housing 12, is arranged in the contact holder 44. The contact holder 44 is surrounded by a spring clip 46. The spring clip 46 is arranged, for example, in the protective sleeve 42 such that it rests against the second stop surface 64. The protective sleeve 42 is then pushed onto the housing 12. In this case, the spring clip 46 is in contact with the first stop surface 62. Upon further urging, the spring clip 46 compresses and deforms between the protective sleeve 42 and the housing 12. As a deflection movement, the spring clip 46 presses with the recess 58 inwardly against the contact holder 44, so that it is secured in its position and centered in the longitudinal bore 16. In this case, a first prestress of the spring clip 46 acts in a direction substantially perpendicular to the longitudinal extension direction 18. The spring clip 46 in particular exerts a first pretensioning force point-like on the contact holder 44.
Fig. 3 shows a cross-sectional view of a sensor 10 according to a second embodiment of the invention for sensing at least one property of a measurement gas in a measurement gas chamber, in particular for sensing a component of a gas component in the measurement gas or a temperature of the measurement gas.
Only the different and identical or type components with respect to the first embodiment are described below with the same reference numerals. In the second embodiment, the spring clip 46 is substantially cage-shaped. Thus, the spring clip 46 has a first abutment section 70, a curved intermediate section 72 and a second abutment section 74, seen between the front end 66 and the rear end 68. The first abutment section 70 is located on the front end 66 of the spring clip 46. The curved intermediate section 72 is located between the first abutment section 70 and the second abutment section 74. The first abutment section 70 is designed to abut against a cylindrical wall section 76 of the protective sleeve 42. The second bearing section 74 is designed to bear against a shoulder surface 78 of the protective sleeve 42. The second abutment section 74 extends substantially perpendicularly to the first abutment section 72. The second contact portion 74 extends in particular in a radial direction with respect to the longitudinal extension direction 18. The spring clip 46 has a spring tongue 80 which is configured for pressing onto the contact holder 44. The spring tongue 80 is formed integrally with the curved intermediate section 72 and extends obliquely thereto in the direction of the second contact section 74, which simplifies the insertion of the contact holder 44 into the spring clip 46. The spring clip 46 is secured to the protective sleeve 42. The fastening can be achieved by means of a weld 82 on the protective sleeve 42 and the first contact portion 70. The weld spot 82 may be constructed by means of laser welding. Alternatively or additionally, the protective sleeve 42 may have a crimp 84 after installation of the spring clip 46 such that the spring clip 46 cannot move in the axial direction. Alternatively, the spring clip 46 can be fixed on the protective sleeve 42 on the second contact section 74 or can rest movably on the shoulder surface 78.
Further, in the second embodiment, at least one contact spring 86 is disposed between the contact portion holder 44 and the sensor element 20. The contact spring 86 exerts a second pretension on the sensor element 20. The contact spring 86 is of arcuate design. When the sensor element 20 is pushed into the contact spring, the arches are pushed apart relative to one another, so that the sensor element 20 is held. The second pretension causes a reduction of the first pretension, so that no excessive forces are exerted on the sensor element 20, which could damage the sensor element. In addition, the second pretension causes a centering of the sensor element 20. The contact spring 86 may be configured for electrical contacting of the sensor element 20. In this case, the contact spring 86 is made of a conductive material.
The damped contact method is responsible for determining the force of the contact clamping pressure on the sensor element 20. In the sensors known to date, sensor elements which are in many cases prone to bending are pressed into the housing by means of a packaging. It may occur here that the sensor element may have a slight inclination in the housing. This non-optimal orientation of the sensor element in the housing is overcome and corrected by the damping contact described above. The damping contact ensures that forces during the joining process, in particular when pushing the cable harness onto the assembly with the sensor element pressed into the housing, do not lead to premature damage of the sensor element or to the bearing of forces acting asymmetrically. This can be achieved in particular by: the friction between different materials, especially ceramic and steel, is minimized or coordinated. Collisions in the sense of a defined positioning of the components are permissible, but should be avoided as far as possible, since they may be sufficient to cause a deviating tilting of the contact part holder on the basis of the required tolerances.
Fig. 4 shows an exploded view of the sensor 10 according to a third embodiment. Fig. 5 shows a cross-sectional view of a sensor 10 according to a third embodiment, wherein the cross-section runs perpendicular to the longitudinal extension 18, 22. Only the differences with respect to the first embodiment are described below and identical and similar components are provided with the same reference numerals. In the third embodiment, the spring clip 46, which serves as a positioning unit, has an increased outer diameter 88 and an increased inner diameter 90 as compared to a positioning unit in a conventional sensor. This makes it possible for the spring clip 46 to bear floatingly against the contact holder 44. The floating bearing allows a certain play in the axial direction, so that the contact retainer is not fixed explicitly in the axial direction. Mechanical or thermal length changes can thus be accepted.
In conventional sensors, the sensor element is engaged between two press contacts of opposing pairs of contact springs when the assembly is engaged in the cable harness. During the joining and subsequent process steps, such as gap-welding and pre-tensioning or welding, a relative movement between the sensor element and the contact holder can occur, which creates a unilateral load on the ceramic sensor element until an overload is produced. The compensating movement, which minimizes the load acting on the ceramic sensor element, is therefore provided by a floating bearing, which is realized by a disk spring between the contact holder and the axial stop face of the protective sleeve.
Thus, in contrast to conventional sensors in which a disk spring is provided between the axial stop faces of the contact holder and the protective sleeve, the floating bearing is provided as a contact pair of the contact holder 44 and the spring clip 46 in the sensor 10 of the third embodiment. By means of the larger inner diameter of the spring clip 46, the contact holder is assigned a larger compensation path. The outer diameter of the spring clip 46 can thus be selected to be large. The increased outer diameter allows the spring clip 46 to be better centered within the protective sleeve 42. Thus, the spring clip 46 and the contact retainer 44 have a better defined coefficient of friction than in a conventional sensor having a deep-drawn piece protective sleeve and a disc spring.
Fig. 6 shows a cross-sectional view of a sensor 10 according to a fourth embodiment. Only the differences with respect to the first embodiment are described below and identical or similar components are provided with the same reference numerals. In the fourth embodiment, the spring clip 46 serving as a positioning unit has at least one hook-shaped or claw-shaped first projection 92, which is configured for fixing the spring clip 46 in the protective sleeve 42. For this purpose, a hook-shaped or claw-shaped first projection 92 extends outwardly in a substantially radial direction. In the embodiment shown, the spring clip 46 has a plurality of, for example three or four, hook-shaped or claw-shaped first projections 92. Furthermore, the spring clip 46 has at least one hook-shaped or claw-shaped second projection 94 for fastening the contact holder 44. For this purpose, a hook-shaped or claw-shaped second projection 94 extends inwardly in a substantially radial direction. In the embodiment shown, the spring clip 46 has a plurality of, for example three or four, hook-shaped or claw-shaped second projections 94. A hook-shaped or claw-shaped second projection 94 partially surrounds the contact holder 44 at its axial end opposite the second stop face 64.
As already explained above, in conventional sensors, the floating mounting is realized by a disk spring between the contact holder and the axial stop face of the protective sleeve. Here, an eccentric position of the disk spring, of the contact retainer and/or of the spring clamp may occur due to the press-on contact with the predeformation. The spring clip resting on the protective sleeve thereby produces a significant eccentricity with respect to the longitudinal axis of the sensor element.
In the fourth embodiment, the first projection of the spring clip secures the spring clip 46 centrally about the longitudinal axis of the protection sleeve 42. In the fourth embodiment, the second projection of the spring clip centrally fixes the contact holder 44 relative to the spring clip 46. By means of said fixing, a possible rotation of the contact portion holder is prevented. The contact retainer is centered and held in place prior to engaging the spring clip 46 into the protective sleeve 42 so that dropping is not likely to occur. In addition, the protrusion of the unit consisting of the contact holder and the spring clip during transport of the cable bundle is prevented or at least significantly impeded. The spring clip causes a small resistance against compensation of the potential eccentricity.
Claims (14)
1. Sensor (10) for sensing at least one property of a measurement gas in a measurement gas chamber, in particular for sensing a component of a gas component in the measurement gas or a temperature of the measurement gas, comprising a sensor element (20), a housing (12) and a protective sleeve (42), wherein the housing (12) is at least partially surrounded by the protective sleeve (42) and has a longitudinal bore (16) in which the sensor element (20) is arranged, wherein the sensor (10) further has a contact holder (44) and a spring clip (46), wherein the contact holder (44) is configured for holding the sensor element (20), wherein the spring clip (46) is configured for fixing the contact holder (44), wherein the spring clip (46) is arranged between the housing (12) and the protective sleeve (42) in such an elastically deformed manner, so that the spring clip (46) exerts a first pretensioning force on the contact holder (44).
2. Sensor (10) according to claim 1, wherein the longitudinal bore (16) extends along a longitudinal extension direction (18), wherein the first pretension force acts in a direction substantially perpendicular to the longitudinal extension direction (18).
3. Sensor (10) according to claim 1 or 2, wherein the spring clip (46) exerts the first pretensioning force point-shaped onto the contact holder (44).
4. Sensor (10) according to one of claims 1 to 3, wherein the housing (12) has a first stop face (62), wherein the protective sleeve (42) has a second stop face (64), wherein the first stop face (62) and the second stop face (64) are configured for elastically deforming the spring clip (46) when the protective sleeve (42) is fitted on the housing (12).
5. Sensor (10) according to claim 4, wherein the first stop surface (62) and/or the second stop surface (64) is an axial stop surface.
6. The sensor (10) of any of claims 1 to 5, wherein the spring clip (46) is configured as a cage or sleeve (48) with a slot (50).
7. A sensor (10) according to any of claims 1 to 3, wherein the spring clip (46) is fixed on the protective sleeve (42).
8. Sensor (10) according to claim 7, wherein the spring clip (46) is fixed on the protective sleeve (42) by means of welding or caulking.
9. Sensor (10) according to any one of claims 6 to 8, wherein the spring clip (46) has a spring tongue (80) configured for pressing against the contact holder (44).
10. Sensor (10) according to one of claims 1 to 9, wherein a contact spring (86) is arranged between the contact holder (44) and the sensor element (20), wherein the contact spring (86) exerts a second pretensioning force on the sensor element (20).
11. The sensor (10) of claim 10, wherein the contact spring (86) is arcuately configured.
12. The sensor (10) of any one of claims 1 to 11, wherein the spring clip (46) is configured for centering the contact holder (44) in the longitudinal bore (16).
13. The sensor (10) of any of claims 1 to 12, wherein the spring clip (46) floatingly supports the contact portion holder (44).
14. Sensor (10) according to one of claims 1 to 12, wherein the spring clip (46) has at least one hook-shaped or claw-shaped first projection configured for fixing the spring clip (46) in the protective sleeve (42), wherein the spring clip (46) also has at least one hook-shaped or claw-shaped second projection for fixing the contact retainer (44).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018214896.1 | 2018-09-03 | ||
| DE102018214896 | 2018-09-03 | ||
| DE102018221566.9A DE102018221566A1 (en) | 2018-09-03 | 2018-12-12 | Sensor for detecting at least one property of a sample gas in a sample gas space |
| DE102018221566.9 | 2018-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110873747A true CN110873747A (en) | 2020-03-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910826551.6A Pending CN110873747A (en) | 2018-09-03 | 2019-09-03 | Sensor for sensing at least one property of a measurement gas in a measurement gas chamber |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110873747A (en) |
| DE (1) | DE102018221566A1 (en) |
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2018
- 2018-12-12 DE DE102018221566.9A patent/DE102018221566A1/en active Pending
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| US5817920A (en) * | 1997-03-18 | 1998-10-06 | General Motors Corporation | Oxygen sensor with annular support member providing improved mechanical shock resistance |
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| DE102018221566A1 (en) | 2020-03-05 |
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