EP2223066A2 - Part for measuring forces or pressures, and sensor comprising such a part - Google Patents

Part for measuring forces or pressures, and sensor comprising such a part

Info

Publication number
EP2223066A2
EP2223066A2 EP08854262A EP08854262A EP2223066A2 EP 2223066 A2 EP2223066 A2 EP 2223066A2 EP 08854262 A EP08854262 A EP 08854262A EP 08854262 A EP08854262 A EP 08854262A EP 2223066 A2 EP2223066 A2 EP 2223066A2
Authority
EP
European Patent Office
Prior art keywords
component
component according
glow plug
measuring element
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08854262A
Other languages
German (de)
French (fr)
Inventor
Michael Müller
Andrea Bertola
Kay Unzicker
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.)
Kistler Holding AG
Original Assignee
Kistler Holding AG
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 Kistler Holding AG filed Critical Kistler Holding AG
Publication of EP2223066A2 publication Critical patent/EP2223066A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
    • G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • G01L23/222—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines using piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/008—Transmitting or indicating the displacement of flexible diaphragms using piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/08—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of piezoelectric devices, i.e. electric circuits therefor

Definitions

  • the invention relates to a component for installation in force or pressure sensors comprising a measuring element of piezoelectric material according to the preamble of the main claim and a sensor comprising such a component.
  • Sensors comprising such components are used, for example, for measuring in combustion chambers, for example in glow plugs.
  • WO 2006/089446 a component of the type described above is known. It is particularly suitable to be used in glow plugs. However, this component must either have insulated lines to the electrodes, or their isolation from each other must be achieved with a complex part that engages in the component. These measures are very expensive.
  • WO 2007/096205 describes a glow plug which can use, for example, a component as described in WO 2006/089446. It comprises a centering element with a centering section which is intended to center the component in the glow plug. The difficulty, however, is to produce this centering section and the surface on which the component adjoins, in the required flatness, in order to perform the centering. Presentation of the invention
  • Object of the present invention is to provide a component for installation in force or pressure sensors of the type mentioned, which is constructed such that a centered installation in a sensor moglxch without further centering parts.
  • Another object of the invention is to provide a component which does not require any expensive parts to insulate the leads for the electrodes.
  • the component according to the invention comprises a measuring element made of piezoelectric material, on both sides of which an electrode with lines attached thereto, as well as a transmission body adjacent to the first electrode, as well as an insulating body adjacent to the second electrode.
  • the Ubertragungskorper and Isolationskorper are electrically insulating. All these components are centered to each other fixed to a component.
  • the idea underlying the invention is that the outer surfaces of the component with respect to its axis have a flatness of less than 10 ⁇ m. This allows the component positioned on these surfaces to be installed in a sensor without the need for additional components for centering. As a result, additional components can be saved, which, apart from the cost advantages, also saves space. Thus, sensors can be made smaller.
  • a particular further embodiment of the component according to the invention consists in that the insulating body has at least two bores in which the cables pass through each other in isolation through the insulating body. As a result, they can not touch and are always electrically isolated from each other.
  • Figure 1 is a schematic representation of a preferred arrangement of a glow plug according to the invention, in cross section.
  • FIG. 2 is a schematic representation of a detail of a preferred glow plug in cross section, in the region of the inventive component.
  • 3 is a schematic representation of the inventive component with a Glühstromdraht.
  • Fig. 4 is a schematic representation of the insulating part in side view.
  • Fig. 1 shows a possible embodiment as an application of an inventive component 2 in a glow plug 1.
  • the figure shows in a cross section a schematic representation of a preferred glow plug 1.
  • This includes a housing 24, in the front region of a glow plug 20 is inserted, which protrudes from this.
  • a power transmission sleeve 21 may be located, behind which the inventive component 2 is arranged.
  • the component 2 may also be arranged directly behind the glow plug.
  • Behind this component 2 is a fixation 22, which bears against a connecting element 23 at the rear.
  • the connecting element 23 is attached at its rear end to a shoulder 25 of the housing 24.
  • Alternative constructions with the same effects are also possible.
  • the fixing 22 may be welded to the housing 24 at a welding point 30, whereby no force is transmitted via the connecting element 23 on the shoulder 25 of the housing 24.
  • a pressure in the combustion chamber acts via the glow plug 20 directly or via the power transmission sleeve 21 on the component 2, which converts the pressure into a measurement signal.
  • This measuring signal is finally conducted via two lines 10, 10 'from the component 2 via a wiring 26 to an evaluation device (not shown).
  • the housing 24 For mounting the glow plug 1 in a designated hole of a cylinder head, the housing 24 usually has a thread 27 and a hexagon 28 as an attack surface for a tool.
  • the welding point 30 is arranged in this case in the region between the thread 27 and the glow plug 20.
  • the welding point 30 may preferably be attached to an intermediate sleeve, not shown, instead of the housing 24. be brought, which applies the bias and is separated from the housing 24, apart from their attachment thereto.
  • the glow plug 1 In the rearmost area of the glow plug 1 is the output for the wiring 26, which apart from the lines 10, 10 'for the .Bauteil 2, the power supply for a Glühstromdraht 31, which is provided for the heating of the glow plug 20 includes.
  • a diaphragm 29 In the front region of the glow plug 1 is a diaphragm 29, which seals the interior of the housing 24 from the combustion chamber. By means of this membrane 29 and a desired bias voltage can be brought to the component 2.
  • At least a portion of the power transmission sleeve 21 is made of heat-insulating material, so that the component 2 is less exposed to the heat load from the combustion chamber.
  • FIG. 2 shows a detailed section of FIG. 1 in the region of the component 2.
  • the various components of the component 2 have substantially the same outer diameter.
  • a measuring element 3 forms the core of the component 2. This consists of piezoelectric material, such as piezoelectric crystal or piezoelectric ceramic. This measuring element 3 is surrounded on both sides in the axial direction by a first electrode 4 and by a second electrode 4 '. At these electrodes 4, 4 ', the lines 10, 10' are attached to contact points 8. Adjacent to the first electrode 4 opposite to the measuring element 3, an electrically insulating transmission body 5 is attached, and adjacent to the second electrode 4 'opposite the measuring element 3, an electrically insulating insulating body 6 is attached. All of these components 3, 4, 4 ', 5 and 6 are centered fixed to one another to a component 2. This fixing attachment, for example, by a film or shrink tubing surrounding these components.
  • the component 2 is shown with the Glühstromdraht 31.
  • the combustion chamber side surfaces of the components are marked with a, the connector side surfaces with b.
  • the outer side of the transfer body 5a and the outer side of the insulating body 6b, which run away from the electrodes 4, 4 'parallel to these, are very flat with a flatness of less than 10 ⁇ m, preferably less than 5 ⁇ m. This allows a later simple, centered installation in a sensor. It has been found that the centering element used in WO 2007/096205 can be configured at its contact surface to the component 2 only with considerable effort in the required flatness. In addition, can be completely dispensed with the execution of centering and centering with correspondingly high accuracy. The design described here is thus much cheaper.
  • the inner surfaces of the component 2, which run parallel to these surfaces 5a, 6b, namely both sides of the measuring element 3a, 3b, both sides of both electrodes 4a, 4b, 4'a, 4'b and the inner side of the transmission body 5b and the inner side of the insulating body 6a are very plan designed with a flatness of less than lO ⁇ m.
  • the insulation body 6 at least two holes 9, 9 ', in which the lines 10, 10' isolated to each other through the insulation body 6 by.
  • a centering as described in WO 2007/096205, used whose function it was among other things to provide for the isolation of these lines 10, 10 '.
  • the two bores 9, 9 ' can also be connected to each other as long as the insulation of the lines 10, 10' extending therein is ensured. In particular, it may be segments of the same bore, as long as the lines 10, 10 'are mounted at a distance from each other.
  • the newly created space in the center of the transitional body 5 due to the omission of the centering body can now be used differently, for example for a heating coil.
  • the Ubertragungskorper 5 and 6 Isolationskorper fulfill other important functions. At least one of these bodies 5, 6 is preferably an expansion body that compensates for the thermal expansions of the housing 24.
  • the two bodies 5, 6 also fulfill the task of mechanically protecting the measuring element 3 with the electrodes 4, 4 'on both sides. They are pressed parts according to the invention, as a rule of ceramic, preferably of aluminum oxide.
  • At least the transfer body 5 is also a thermal insulator. This has the advantage that the component 2 attached behind is exposed to a lower temperature and thus has to meet lower requirements.
  • the electrodes serve to collect the charges which occur during pressure or force on both sides of the measuring element 3 and to forward them to the contact points 8 provided for this purpose.
  • These contact points 8 are preferably located in the inner region of the component 2. This is advantageous since, as a rule there is hardly any space on the outside between the component 2 and the housing 24 for the routing away of the lines.
  • Part 2 brought under bias, which is a later
  • Fig. 3 shows the component when it is penetrated by the Glühstromdraht 31. This is the case when it is installed in a glow plug.
  • the insulating body 6 has a further bore 9 '', through which the Glühstromdraht 31 can be performed.
  • This bore 9 '' preferably has a local taper 7, which can lead the Glühstromdraht 31 fed.
  • This taper 7 is preferably closer to the outside 6b than to the inside 6a of the insulating body 6.
  • the heat-affected zone is further away from the measuring element 3, whereby the temperature at this can be kept low.
  • the bore 9 '' with the taper 7 can also have a different geometric configuration.
  • this taper 7 or the bore 9 '' itself is preferably arranged eccentrically in the insulating body 6.
  • the position of the two holes 9, 9' uniquely determined. This is necessary for a machine connection of the lines 10, 10 'to the cabling provided for this purpose.
  • Such just described component 2 is specifically designed to be installed in a standard installation in pressure sensors for internal combustion engines, especially in glow plugs. This requires a simple, inexpensive construction and high process reliability for creating the high-precision flat surfaces.
  • the inventive embodiment of the component 2 described here is characterized mainly by its simplicity and the consequent cost-effective production, which can be automated.
  • all components of the component 2 are centered.
  • the attachment ensures the preservation of the centering until the component 2 is installed and biased in the sensor.
  • This arrangement is, in contrast to other components for the same applications in which one of the electrodes is connected to the housing, the component 2 also ground-isolated. This ground insulation is required by law in many countries for all components in an automobile.
  • the component 2 is arranged in the front region of the glow plug 1, which is in the installed state in the region of the glow plug bore of the cylinder head. Accordingly, the component 2 is preferably arranged in front of or in the region of the thread 27. This ensures on the one hand that this is not over 220 0 C warm because the cylinder head is cooled.
  • Another advantage of this mounting position is that the measurement error is lower, the closer the component 2 is to the pressure chamber, that is, to the combustion chamber.
  • Another advantage of the front mounting position of the component 2 is that thereby in the rear region of the glow plug, for example in the region of the connecting element 23, space for an integrated amplifier. As a result, an already amplified output signal can be forwarded through the wiring 26.
  • the installation of the component 2 in the front region requires, however, that the component 2 has an outer diameter of at most 5 mm in order to find 27 place in a glow plug 1 with an M8 thread.
  • the length of the component is typically between about 6 and 15 mm.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The invention relates to a part (2) to be mounted into force or pressure sensors. Said part (2) comprises an annular measuring element (2) made of piezoelectric material, first and second electrodes (4, 4') that rest against both sides of the measuring element (3) and are provided with wires (10, 10'), an electrically insulating transmission member (5) that laterally adjoins the first electrode (4), across from the measuring element (3), and an electrically insulating insulation member (6) which laterally adjoins the second electrode (4'), across from the measuring element (3). All said components (3, 4, 4', 5, 6) are mounted within the part (2) in such a way as to be centered relative to each other. According to the invention, the external face of the transmission member (5a) and the external face of the insulation member (6b) which face away from and run parallel to the electrodes (4, 4') are designed in a very planar manner, having a levelness of less than 10μm.

Description

BAUTEIL FÜR KRAFT- ODER DRUCKMESSUNGEN UND SENSOR UMFASSEND EIN SOLCHES BAUTEILCOMPONENT FOR POWER OR PRESSURE MEASUREMENTS AND SENSOR COMPRISING SUCH A COMPONENT
Technisches GebietTechnical area
Die Erfindung betrifft ein Bauteil zum Einbau in Kraft- oder Drucksensoren umfassend ein Messelement aus piezoelektrischem Material gemäss dem Oberbegriff des Hauptanspruchs sowie einen Sensor, umfassend ein solches Bauteil.The invention relates to a component for installation in force or pressure sensors comprising a measuring element of piezoelectric material according to the preamble of the main claim and a sensor comprising such a component.
Stand der TechnikState of the art
Sensoren umfassend solche Bauteile werden beispielsweise zum Messen in Brennräumen, beispielsweise in Glühkerzen verwendet.Sensors comprising such components are used, for example, for measuring in combustion chambers, for example in glow plugs.
Aus der WO 2006/089446 ist ein Bauteil oben beschriebener Art bekannt. Es ist insbesondere geeignet, in Glühkerzen verwendet zu werden. Dieses Bauteil muss aber entweder isolierte Leitungen zu den Elektroden aufweisen, oder deren Isolation zueinander muss mit einem aufwändigen Teil erreicht werden, das in das Bauteil eingreift. Diese Massnahmen sind sehr teuer .From WO 2006/089446 a component of the type described above is known. It is particularly suitable to be used in glow plugs. However, this component must either have insulated lines to the electrodes, or their isolation from each other must be achieved with a complex part that engages in the component. These measures are very expensive.
Die WO 2007/096205 beschreibt eine Glühkerze, welche bei- spielsweise ein Bauteil wie in der WO 2006/089446 beschrieben verwenden kann. Es umfasst ein Zentrierelement mit einem Zentrierabschnitt, welches das Bauteil in der Glühkerze zentrieren soll. Die Schwierigkeit besteht aber darin, diesen Zentrierabschnitt und die Fläche, an der das Bauteil an- grenzt, in der geforderten Ebenheit herzustellen, um damit die Zentrierung durchzuführen. Darstellung der ErfindungWO 2007/096205 describes a glow plug which can use, for example, a component as described in WO 2006/089446. It comprises a centering element with a centering section which is intended to center the component in the glow plug. The difficulty, however, is to produce this centering section and the surface on which the component adjoins, in the required flatness, in order to perform the centering. Presentation of the invention
Aufgabe der vorliegenden Erfindung ist es, ein Bauteil zum Einbau in Kraft- oder Drucksensoren eingangs erwähnter Art anzugeben, welches derart konstruiert ist, dass ein zentrierter Einbau in einen Sensor ohne weitere Zentrierteile moglxch wird. Eine weitere Aufgabe der Erfindung ist es, ein Bauteil anzugeben, welches keine aufwandigen Teile zum Isolieren der Leitungen für die Elektroden benotigt.Object of the present invention is to provide a component for installation in force or pressure sensors of the type mentioned, which is constructed such that a centered installation in a sensor moglxch without further centering parts. Another object of the invention is to provide a component which does not require any expensive parts to insulate the leads for the electrodes.
Die Aufgabe wird gelost durch die Merkmale des unabhängigen Patentanspruchs sowie durch die Unteranspruche .The object is achieved by the features of the independent claim and by the dependent claims.
Das erfindungsgemasse Bauteil umfasst ein Messelement aus piezoelektrischem Material, beidseits davon je eine Elektrode mit daran angebrachten Leitungen, sowie angrenzend an die erste Elektrode einen Ubertragungskorper, sowie angrenzend an die zweite Elektrode einen Isolationskorper . Der Ubertragungskorper sowie der Isolationskorper sind elektrisch isolierend. Alle diese Komponenten sind zentriert zueinander zu einem Bauteil fixiert. Die der Erfindung zugrunde liegende Idee besteht darin, dass die ausseren Flachen des Bauteils bezuglich seiner Achse eine Ebenheit aufweisen von weniger als lOμm. Dadurch lasst sich das Bauteil an diesen Flachen positioniert in einen Sensor einbauen, ohne weitere Komponenten für die Zentrierung zu benotigen. Dadurch können zusatz- liehe Komponenten eingespart werden, was abgesehen von den Kostenvorteilen auch Platzersparnisse bringt. Somit können Sensoren kleiner gebaut werden. Weitere bevorzugte Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben. Eine besondere weitere erfin- dungsgemässe Ausgestaltung des Bauteils besteht darin, dass der Isolationskörper mindestens zwei Bohrungen aufweist, in denen die Leitungen isoliert zueinander durch den Isolationskörper durch treten. Dadurch können sie sich nicht berühren und sind stets elektrisch isoliert zueinander.The component according to the invention comprises a measuring element made of piezoelectric material, on both sides of which an electrode with lines attached thereto, as well as a transmission body adjacent to the first electrode, as well as an insulating body adjacent to the second electrode. The Ubertragungskorper and Isolationskorper are electrically insulating. All these components are centered to each other fixed to a component. The idea underlying the invention is that the outer surfaces of the component with respect to its axis have a flatness of less than 10 μm. This allows the component positioned on these surfaces to be installed in a sensor without the need for additional components for centering. As a result, additional components can be saved, which, apart from the cost advantages, also saves space. Thus, sensors can be made smaller. Further preferred embodiments of the invention are described in the subclaims. A particular further embodiment of the component according to the invention consists in that the insulating body has at least two bores in which the cables pass through each other in isolation through the insulating body. As a result, they can not touch and are always electrically isolated from each other.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Im Folgenden wird die Erfindung unter Beizug der Zeichnungen näher erklärt. Es zeigenThe invention will be explained in more detail below with reference to the drawings. Show it
Fig. 1 eine schematische Darstellung einer bevorzugten Anordnung einer erfindungsgemässen Glühkerze, im Querschnitt;Figure 1 is a schematic representation of a preferred arrangement of a glow plug according to the invention, in cross section.
Fig. 2 eine schematische Darstellung eines Ausschnitts einer bevorzugten Glühkerze im Querschnitt, im Bereich des erfindungsgemässen Bauteiles;2 is a schematic representation of a detail of a preferred glow plug in cross section, in the region of the inventive component.
Fig. 3 eine schematische Darstellung des erfindungsgemässen Bauteiles mit einem Glühstromdraht;3 is a schematic representation of the inventive component with a Glühstromdraht.
Fig. 4 eine schematische Darstellung des Isolationsteils in Seitenansicht.Fig. 4 is a schematic representation of the insulating part in side view.
Wege zur Ausführung der ErfindungWays to carry out the invention
Die Fig. 1 zeigt ein mögliches Ausführungsbeispiel als Anwendung eines erfindungsgemässen Bauteils 2 in einer Glühkerze 1. Die Figur zeigt in einem Querschnitt eine schematische Darstellung einer bevorzugten Glühkerze 1. Diese umfasst ein Gehäuse 24, in dessen vorderem Bereich ein Glühstift 20 eingesetzt ist, der aus diesem herausragt. Anschliessend hinter dem Glühstift 20 kann sich eine Kraftübertragungshülse 21 befinden, hinter welcher das erfindungsgemässe Bauteil 2 angeordnet ist. Alternativ dazu kann das Bauteil 2 auch direkt hinter dem Glühstift angeordnet sein. Hinter diesem Bauteil 2 befindet sich eine Fixierung 22, welche rückseitig an einem Verbindungselement 23 anliegt. Das Verbindungselement 23 ist an seinem hinteren Ende an einem Absatz 25 des Gehäuses 24 angebracht. Alternative Konstruktionen mit denselben Wirkungen sind ebenfalls möglich. Insbesondere kann die Fixierung 22 am Gehäuse 24 an einer Schweissstelle 30 angeschweisst sein, wodurch keine Kraft mehr über das Verbindungselement 23 auf den Absatz 25 des Gehäuses 24 übertragen wird. Bei einer Messung wirkt ein Druck im Brennraum über den Glühstift 20 direkt oder über die Kraftübertragungshülse 21 auf das Bauteil 2, das den Druck in ein Messsignal umwandelt. Dieses Messsignal wird schliesslich über zwei Leitungen 10, 10' vom Bauteil 2 über eine Verkabelung 26 zu einem Auswertegerät (nicht dargestellt) geleitet.Fig. 1 shows a possible embodiment as an application of an inventive component 2 in a glow plug 1. The figure shows in a cross section a schematic representation of a preferred glow plug 1. This includes a housing 24, in the front region of a glow plug 20 is inserted, which protrudes from this. Subsequently, behind the glow plug 20, a power transmission sleeve 21 may be located, behind which the inventive component 2 is arranged. Alternatively, the component 2 may also be arranged directly behind the glow plug. Behind this component 2 is a fixation 22, which bears against a connecting element 23 at the rear. The connecting element 23 is attached at its rear end to a shoulder 25 of the housing 24. Alternative constructions with the same effects are also possible. In particular, the fixing 22 may be welded to the housing 24 at a welding point 30, whereby no force is transmitted via the connecting element 23 on the shoulder 25 of the housing 24. In one measurement, a pressure in the combustion chamber acts via the glow plug 20 directly or via the power transmission sleeve 21 on the component 2, which converts the pressure into a measurement signal. This measuring signal is finally conducted via two lines 10, 10 'from the component 2 via a wiring 26 to an evaluation device (not shown).
Zur Anbringung der Glühkerze 1 in einer dafür vorgesehenen Bohrung eines Zylinderkopfes verfügt das Gehäuse 24 in der Regel über ein Gewinde 27 und über einen Sechskant 28 als Angriffsfläche für ein Werkzeug. Die Schweissstelle 30 ist in diesem Fall im Bereich zwischen dem Gewinde 27 und dem Glühstift 20 angeordnet. Um fehlerhafte Auswirkungen durch das Verspannen der Glühkerze 1 beim Einbau auf eine Messung zu vermeiden, kann die Schweissstelle 30 vorzugsweise anstatt am Gehäuse 24 an einer nicht dargestellten Zwischenhülse ange- bracht sein, welche die Vorspannung aufbringt und vom Gehäuse 24, abgesehen von ihrer Befestigung daran, getrennt ist.For mounting the glow plug 1 in a designated hole of a cylinder head, the housing 24 usually has a thread 27 and a hexagon 28 as an attack surface for a tool. The welding point 30 is arranged in this case in the region between the thread 27 and the glow plug 20. In order to avoid erroneous effects due to the distortion of the glow plug 1 during installation on a measurement, the welding point 30 may preferably be attached to an intermediate sleeve, not shown, instead of the housing 24. be brought, which applies the bias and is separated from the housing 24, apart from their attachment thereto.
Im hintersten Bereich der Glühkerze 1 befindet sich der Ausgang für die Verkabelung 26, die abgesehen von den Leitungen 10, 10' für das .Bauteil 2 auch die Stromversorgung für einen Glühstromdraht 31, der für die Beheizung des Glühstiftes 20 vorgesehen ist, umfasst. Im vorderen Bereich der Glühkerze 1 befindet sich eine Membran 29, welche das Innere des Gehäuses 24 vom Brennraum abdichtet. Mittels dieser Membran 29 kann auch eine gewünschte Vorspannung auf das Bauteil 2 gebracht werden .In the rearmost area of the glow plug 1 is the output for the wiring 26, which apart from the lines 10, 10 'for the .Bauteil 2, the power supply for a Glühstromdraht 31, which is provided for the heating of the glow plug 20 includes. In the front region of the glow plug 1 is a diaphragm 29, which seals the interior of the housing 24 from the combustion chamber. By means of this membrane 29 and a desired bias voltage can be brought to the component 2.
Vorzugsweise ist mindestens ein Teil der Kraftübertragungshülse 21 aus wärmeisolierendem Material, sodass das Bauteil 2 weniger der Wärmebelastung aus dem Brennraum ausgesetzt ist.Preferably, at least a portion of the power transmission sleeve 21 is made of heat-insulating material, so that the component 2 is less exposed to the heat load from the combustion chamber.
Fig. 2 zeigt einen detaillierten Ausschnitt der Fig. 1 im Bereich des Bauteiles 2. Vorzugsweise weisen die verschiedenen Komponenten des Bauteil 2 im Wesentlichen dieselben äusseren Durchmesser auf. Ein Messelement 3 bildet das Kernstück des Bauteiles 2. Dieses besteht aus piezoelektrischem Material, beispielsweise aus piezoelektrischem Kristall oder aus piezoelektrischer Keramik. Dieses Messelement 3 ist beidseitig in Achsrichtung umgeben von einer ersten Elektrode 4 und von einer zweiten Elektrode 4' . An diesen Elektroden 4, 4' sind an Kontaktstellen 8 die Leitungen 10, 10' angebracht. Angrenzend neben der ersten Elektrode 4 gegenüber dem Messelement 3 ist ein elektrisch isolierender Übertragungskörper 5 angebracht, und angrenzend neben der zweiten Elektrode 4' gegenüber dem Messelement 3 ist ein elektrisch isolierender Isolationskörper 6 angebracht. Alle diese Komponenten 3, 4, 4', 5 und 6 sind zentriert zueinander zu einem Bauteil 2 fixiert. Diese fixierende Befestigung kann beispielsweise durch einen Film oder Schrumpfschlauch erbracht werden, der diese Komponenten umgibt .FIG. 2 shows a detailed section of FIG. 1 in the region of the component 2. Preferably, the various components of the component 2 have substantially the same outer diameter. A measuring element 3 forms the core of the component 2. This consists of piezoelectric material, such as piezoelectric crystal or piezoelectric ceramic. This measuring element 3 is surrounded on both sides in the axial direction by a first electrode 4 and by a second electrode 4 '. At these electrodes 4, 4 ', the lines 10, 10' are attached to contact points 8. Adjacent to the first electrode 4 opposite to the measuring element 3, an electrically insulating transmission body 5 is attached, and adjacent to the second electrode 4 'opposite the measuring element 3, an electrically insulating insulating body 6 is attached. All of these components 3, 4, 4 ', 5 and 6 are centered fixed to one another to a component 2. This fixing attachment, for example, by a film or shrink tubing surrounding these components.
In Fig. 3 ist das Bauteil 2 mit dem Glühstromdraht 31 dargestellt. Die Brennraumseitigen Flächen der Komponenten werden mit a, deren Steckerseitigen Flächen mit b gekennzeichnet. Erfindungsgemäss sind die Aussenseite des Übertragungskörpers 5a sowie die Aussenseite des Isolationskörpers 6b, die abgewandt von den Elektroden 4, 4' parallel zu diesen verlaufen, sehr plan ausgestaltet mit einer Ebenheit von weniger als lOμm, vorzugsweise weniger als 5μm. Dies erlaubt ein späteres einfaches, zentriertes Einbauen in einen Sensor. Es hat sich erwiesen, dass das in der WO 2007/096205 verwendete Zentrierelement an seiner Berührungsfläche zum Bauteil 2 nur mit erheblichem Aufwand in der erforderlichen Ebenheit ausgestaltet werden kann. Zudem kann auf die Ausführung von Zentrierelementen und Zentrierabschnitten mit entsprechend hoher Genauigkeit gänzlich verzichtet werden. Die hier beschriebene Ausführung kommt somit viel billiger.In Fig. 3, the component 2 is shown with the Glühstromdraht 31. The combustion chamber side surfaces of the components are marked with a, the connector side surfaces with b. According to the invention, the outer side of the transfer body 5a and the outer side of the insulating body 6b, which run away from the electrodes 4, 4 'parallel to these, are very flat with a flatness of less than 10 μm, preferably less than 5 μm. This allows a later simple, centered installation in a sensor. It has been found that the centering element used in WO 2007/096205 can be configured at its contact surface to the component 2 only with considerable effort in the required flatness. In addition, can be completely dispensed with the execution of centering and centering with correspondingly high accuracy. The design described here is thus much cheaper.
Vorzugsweise sind auch die inneren Flächen des Bauteils 2, die parallel zu diesen Flächen 5a, 6b verlaufen, namentlich beide Seiten des Messelements 3a, 3b, beide Seiten beider E- lektroden 4a, 4b, 4'a, 4'b sowie die innere Seite des Übertragungskörper 5b und die innere Seite des Isolationskörpers 6a sehr plan ausgestaltet mit einer Ebenheit von weniger als lOμm.Preferably, the inner surfaces of the component 2, which run parallel to these surfaces 5a, 6b, namely both sides of the measuring element 3a, 3b, both sides of both electrodes 4a, 4b, 4'a, 4'b and the inner side of the transmission body 5b and the inner side of the insulating body 6a are very plan designed with a flatness of less than lOμm.
In einer bevorzugten Ausführung weist der Isolationskörper 6 mindestens zwei Bohrungen 9, 9' auf, in denen die Leitungen 10, 10' isoliert zueinander durch den Isolationskörper 6 durch treten. Dies erübrigt eine separate Isolierung der Lei- tungen 10, 10' . Dadurch kann vermieden werden, dass ein Zentrierkörper, wie in der WO 2007/096205 beschrieben, eingesetzt werden muss, dessen Funktion es unter anderem auch war, für die Isolierung dieser Leitungen 10, 10' zu sorgen. Die beiden Bohrungen 9, 9' können auch miteinander verbunden sein, solange die Isolation der darin verlaufenden Leitungen 10, 10' gewahrleistet ist. Insbesondere können es Segmente derselben Bohrung sein, solange die Leitungen 10, 10' distanziert voneinander angebracht sind. Der durch das Wegfallen des Zent- rierkorpers neu entstandene Raum in Zentrum des Ubergangskor- pers 5 kann nun anders genutzt werden, beispielsweise für ei- nen Heizwendel.In a preferred embodiment, the insulation body 6 at least two holes 9, 9 ', in which the lines 10, 10' isolated to each other through the insulation body 6 by. This eliminates the need for separate insulation of the leads 10, 10 '. This can be avoided that a centering, as described in WO 2007/096205, used whose function it was among other things to provide for the isolation of these lines 10, 10 '. The two bores 9, 9 'can also be connected to each other as long as the insulation of the lines 10, 10' extending therein is ensured. In particular, it may be segments of the same bore, as long as the lines 10, 10 'are mounted at a distance from each other. The newly created space in the center of the transitional body 5 due to the omission of the centering body can now be used differently, for example for a heating coil.
Der Ubertragungskorper 5 und der Isolationskorper 6 erfüllen weitere wichtige Funktionen. Mindestens einer dieser Korper 5, 6 ist vorzugsweise ein Expansionskorper, der die thermische Ausdehnungen des Gehäuses 24 kompensiert. Die beiden Korper 5, 6 erfüllen zudem die Aufgabe, das Messelement 3 mit den beidseitigen Elektroden 4, 4' mechanisch zu schützen. Sie sind erfindungsgemass gepresste Teile, in der Regel aus Keramik, vorzugsweise aus Aluminiumoxyd.The Ubertragungskorper 5 and 6 Isolationskorper fulfill other important functions. At least one of these bodies 5, 6 is preferably an expansion body that compensates for the thermal expansions of the housing 24. The two bodies 5, 6 also fulfill the task of mechanically protecting the measuring element 3 with the electrodes 4, 4 'on both sides. They are pressed parts according to the invention, as a rule of ceramic, preferably of aluminum oxide.
In einer bevorzugten Ausfuhrung ist mindestens der Ubertra- gungskorper 5 auch ein thermischer Isolator. Dies hat den Vorteil, dass das dahinter angebrachte Bauteil 2 einer tieferen Temperatur ausgesetzt ist und somit geringeren Anforderungen genügen muss.In a preferred embodiment, at least the transfer body 5 is also a thermal insulator. This has the advantage that the component 2 attached behind is exposed to a lower temperature and thus has to meet lower requirements.
Insbesondere kann jede Elektrode 4, 4' auch mit ihrem benach- barten Ubertragungskorper 5 resp. mit ihrem benachbarten Isolationskorper 6 einteilig ausgestaltet sein. Die Elektroden dienen dazu, die bei Druck- oder Krafteinwirkung auftretenden Ladungen beidseitig des Messelementes 3 zu sammeln und an die dafür vorgesehenen Kontaktstellen 8 weiter zu leiten. Diese Kontaktstellen 8 befinden sich vorzugsweise im inneren Bereich des Bauteils 2. Dies ist von Vorteil, da in der Regel auf der Aussenseite kaum Platz zwischen dem Bauteil 2 und dem Gehäuse 24 für das Wegführen der Leitungen vorhanden ist.In particular, each electrode 4, 4 'can also communicate with its adjacent transmission body 5, respectively. be designed integrally with their adjacent Isolationskorper 6. The electrodes serve to collect the charges which occur during pressure or force on both sides of the measuring element 3 and to forward them to the contact points 8 provided for this purpose. These contact points 8 are preferably located in the inner region of the component 2. This is advantageous since, as a rule there is hardly any space on the outside between the component 2 and the housing 24 for the routing away of the lines.
Eine Befestigung am Bauteil 2 muss insbesondere dafür sorgen, dass die genannten Komponenten 3, 4, 4' 5 und 6 solange nicht verschoben werden, bis das Bauteil 2 in einem Sensor oder in einer Glühkerze 1 eingebaut ist. Zu diesem Zeitpunkt wird dasAn attachment to the component 2 must in particular ensure that the said components 3, 4, 4 '5 and 6 are not displaced until the component 2 is installed in a sensor or in a glow plug 1. At this time, that will be
Bauteil 2 unter Vorspannung gebracht, welche eine späterePart 2 brought under bias, which is a later
Verschiebung dieser Komponenten ausschliesst . Nach dem Einbau in eine Glühkerze 1 oder in einen Sensor wird diese Befesti- gung hinfällig.Displacement of these components excludes. After installation in a glow plug 1 or in a sensor, this attachment is obsolete.
Fig. 3 zeigt das Bauteil, wenn es von dem Glühstromdraht 31 durchdrungen wird. Dies ist der Fall, wenn es in einer Glühkerze eingebaut ist. In dieser Anwendung verfügt der Isolationskörper 6 über eine weitere Bohrung 9' ' , durch welche der Glühstromdraht 31 durchgeführt werden kann. Diese Bohrung 9'' verfügt vorzugsweise über eine lokale Verjüngung 7, welche den Glühstromdraht 31 satt führen kann. Dadurch wird der Glühstromdraht 31 gut gehalten und hält späteren Vibrationen stand. Diese Verjüngung 7 ist vorzugsweise näher an der Aus- senseite 6b als an der Innenseite 6a des Isolationskörpers 6. Dadurch ist die Wärmeeinflusszone weiter vom Messelement 3 entfernt, wodurch die Temperatur am diesem niedrig gehalten werden kann. Die Bohrung 9'' mit der Verjüngung 7 kann aber auch eine andere geometrische Ausgestaltung haben.Fig. 3 shows the component when it is penetrated by the Glühstromdraht 31. This is the case when it is installed in a glow plug. In this application, the insulating body 6 has a further bore 9 '', through which the Glühstromdraht 31 can be performed. This bore 9 '' preferably has a local taper 7, which can lead the Glühstromdraht 31 fed. As a result, the Glühstromdraht 31 is well held and withstands later vibrations. This taper 7 is preferably closer to the outside 6b than to the inside 6a of the insulating body 6. As a result, the heat-affected zone is further away from the measuring element 3, whereby the temperature at this can be kept low. However, the bore 9 '' with the taper 7 can also have a different geometric configuration.
Wie in Fig. 4 dargestellt ist diese Verjüngung 7 oder die Bohrung 9' ' selbst vorzugsweise exzentrisch im Isolationskörper 6 angeordnet. Dadurch ist bei der Zusammensetzung von Glühstift 20 mit dem Glühstiftdraht 31 einerseits und Bauteil 2 mit den Leitungen 10, 10' andererseits die Lage der beiden Bohrungen 9, 9' eindeutig bestimmt. Dies ist notwendig für eine maschinelle Verbindung der Leitungen 10, 10' zu den dafür vorgesehenen Verkabelungen.As shown in Fig. 4, this taper 7 or the bore 9 '' itself is preferably arranged eccentrically in the insulating body 6. As a result, in the composition of glow plug 20 with the Glühstiftdraht 31 on the one hand and component 2 with the lines 10, 10 'on the other hand, the position of the two holes 9, 9' uniquely determined. This is necessary for a machine connection of the lines 10, 10 'to the cabling provided for this purpose.
Ein solches eben beschriebenes Bauteil 2 ist speziell darauf ausgerichtet, in einem serienmässigen Einbau in Drucksensoren für Verbrennungskraftmaschinen, insbesondere in Glühkerzen, eingebaut zu werden. Dies bedingt einen einfachen, kostengünstigen Aufbau sowie eine hohe Prozesssicherheit zum Schaffen der hochpräzisen ebenen Flächen.Such just described component 2 is specifically designed to be installed in a standard installation in pressure sensors for internal combustion engines, especially in glow plugs. This requires a simple, inexpensive construction and high process reliability for creating the high-precision flat surfaces.
Die hier beschriebene erfindungsgemässe Ausführung des Bau- teils 2 zeichnet sich vorwiegend durch ihre Einfachheit und der daraus folgenden kostengünstigen Herstellung aus, die automatisiert werden kann. Vor der Anbringung der Befestigung werden alle Komponenten des Bauteils 2 zentriert. Die Befestigung gewährleistet die Erhaltung der Zentrierung bis das Bauteil 2 im Sensor eingebaut und vorgespannt ist. Somit und durch die planen Aussenflachen erübrigt sich der Aufwand des Zentrierens beim Einbau in die Glühkerze 1. Durch diese Anordnung ist, im Gegensatz zu anderen Bauteilen für dieselben Anwendungen, bei denen eine der Elektroden mit dem Gehäuse verbunden ist, das Bauteil 2 auch masseisoliert. Diese Masseisolation ist in vielen Ländern vorschriftgemäss notwendig für alle Bauteile in einem Automobil.The inventive embodiment of the component 2 described here is characterized mainly by its simplicity and the consequent cost-effective production, which can be automated. Before attaching the attachment, all components of the component 2 are centered. The attachment ensures the preservation of the centering until the component 2 is installed and biased in the sensor. Thus, and by the flat outer surfaces, the cost of centering during installation in the glow plug 1. This arrangement is, in contrast to other components for the same applications in which one of the electrodes is connected to the housing, the component 2 also ground-isolated. This ground insulation is required by law in many countries for all components in an automobile.
Vorteilhafterweise ist das Bauteil 2 im vorderen Bereich der Glühkerze 1 angeordnet, welcher sich im eingebauten Zustand im Bereich der Glühkerzenbohrung des Zylinderkopfes befindet. Demnach ist das Bauteil 2 vorzugsweise vor oder im Bereich des Gewindes 27 angeordnet. Dadurch ist einerseits gewährleistet, dass dieses nicht über 220 0C warm wird, da der Zylinderkopf gekühlt ist. Ein weiterer Vorteil dieser Einbaula- ge besteht darin, dass der Messfehler geringer ist, je näher das Bauteil 2 an der Druckkammer, also am Brennraum ist. Ein weiterer Vorteil der vorderen Einbaulage des Bauteiles 2 besteht darin, dass dadurch im hinteren Bereich des Glühstiftes, beispielsweise im Bereich des Verbindungselementes 23, Platz für einen integrierten Verstärker ist. Dadurch kann ein bereits verstärktes Ausgangssignal durch die Verkabelung 26 weitergeleitet werden.Advantageously, the component 2 is arranged in the front region of the glow plug 1, which is in the installed state in the region of the glow plug bore of the cylinder head. Accordingly, the component 2 is preferably arranged in front of or in the region of the thread 27. This ensures on the one hand that this is not over 220 0 C warm because the cylinder head is cooled. Another advantage of this mounting position is that the measurement error is lower, the closer the component 2 is to the pressure chamber, that is, to the combustion chamber. Another advantage of the front mounting position of the component 2 is that thereby in the rear region of the glow plug, for example in the region of the connecting element 23, space for an integrated amplifier. As a result, an already amplified output signal can be forwarded through the wiring 26.
Der Einbau des Bauteiles 2 im vorderen Bereich setzt allerdings voraus, dass das Bauteil 2 einen Aussendurchmesser von höchstens 5 mm aufweist, um in einer Glühkerze 1 mit einem M8 Gewinde 27 Platz zu finden. Die Länge des Bauteiles ist typischerweise zwischen etwa 6 und 15 mm. The installation of the component 2 in the front region requires, however, that the component 2 has an outer diameter of at most 5 mm in order to find 27 place in a glow plug 1 with an M8 thread. The length of the component is typically between about 6 and 15 mm.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Glühkerze1 glow plug
2 Bauteil2 component
3 Messelement 4 4' Elektrode3 measuring element 4 4 'electrode
5 Übertragungskörper5 transmission body
6 Isolationskörper6 insulation body
7 Verjüngung7 rejuvenation
8 Kontaktstelle 9 9' 9'' Bohrungen8 contact point 9 9 '9' 'holes
10 10' Leitung10 10 'line
20 Glühstift20 glow plug
21 Kraftübertragungshülse21 power transmission sleeve
22 Fixierung 23 Verbindungselement22 Fixation 23 Connecting element
24 Gehäuse24 housing
25 Absatz25 paragraph
26 Verkabelung26 wiring
27 Gewinde 28 Sechskant27 threads 28 hexagon
29 Membran29 membrane
30 Schweissstelle30 welding point
31 Glühstromdraht 31 glow wire

Claims

Patentansprüche claims
1. Bauteil (2) zum Einbau in Kraft- oder Drucksensoren umfassend ein ringförmiges Messelement (3) aus piezoelektrischem Material, beidseitig des Messelements (3) anlie- gende erste und zweite Elektroden (4, 4') mit Leitungen (10, 10'), sowie angrenzend neben der ersten Elektrode (4) gegenüber dem Messelement (3) einen elektrisch isolierenden Übertragungskörper (5), sowie angrenzend neben der zweiten Elektrode (4') gegenüber dem Messelement (3) einen elektrisch isolierenden Isolationskörper (6), wobei alle diese Komponenten (3, 4, 4', 5, 6) zentriert zueinander zum Bauteil (2) fixiert sind, dadurch gekennzeichnet, dass die Aussenseite des Übertragungskörpers (5a) sowie die Aussenseite des Isolationskörpers (6b), die ab- gewandt von den Elektroden (4, 4') parallel zu diesen verlaufen, sehr plan ausgestaltet sind mit einer Ebenheit von weniger als lOμm.1. component (2) for installation in force or pressure sensors comprising an annular measuring element (3) of piezoelectric material, on both sides of the measuring element (3) fitting first and second electrodes (4, 4 ') with lines (10, 10' ), and adjacent to the first electrode (4) opposite the measuring element (3) an electrically insulating transmission body (5), and adjacent to the second electrode (4 ') opposite the measuring element (3) an electrically insulating insulating body (6), wherein all these components (3, 4, 4 ', 5, 6) centered to each other to the component (2) are fixed, characterized in that the outer side of the transfer body (5a) and the outer side of the insulating body (6b), which turned away from the electrodes (4, 4 ') extend parallel to these, are very flat with a flatness of less than lOμm.
2. Bauteil nach Anspruch 1, dadurch gekennzeichnet, dass auch die inneren Flächen des Bauteils (2), die parallel zu diesen Flächen (5a, 6b) verlaufen, namentlich die beiden Seiten des Messelements (3a, 3b), die beiden Seiten beider Elektroden (4a, 4b, 4'a, 4'b) sowie die innere Seite des Übertragungskörper (5b) und die innere Seite des Isolationskörpers (6a) sehr plan ausgestaltet sind mit einer Ebenheit von weniger als lOμm.2. Component according to claim 1, characterized in that also the inner surfaces of the component (2), which run parallel to these surfaces (5a, 6b), namely the two sides of the measuring element (3a, 3b), the two sides of both electrodes (4a, 4b, 4'a, 4'b) and the inner side of the transfer body (5b) and the inner side of the insulating body (6a) are designed very flat with a flatness of less than lOμm.
3. Bauteil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Isolationskörper (6) mindestens zwei Bohrungen3. Component according to claim 1 or 2, characterized in that the insulating body (6) at least two holes
(9, 9') aufweist, in denen die Leitungen (10, 10') isoliert zueinander durch den Isolationskörper (6) durch treten. (9, 9 '), in which the lines (10, 10') isolated to each other by the insulating body (6) through.
4. Bauteil nach einem der vorhergehenden Ansprüche zur Verwendung in einer Gluhkerze, dadurch gekennzeichnet, dass der Isolationskorpers (6) eine weitere Bohrung (9'') aufweist, durch welche ein Gluhstromdraht (31) durchgeführt werden kann.4. Component according to one of the preceding claims for use in a glow plug, characterized in that the Isolationskorpers (6) has a further bore (9 '') through which a Gluhstromdraht (31) can be performed.
5. Bauteil nach Anspruch 4, dadurch gekennzeichnet, dass die Bohrung (9'') eine lokale Verjüngung (7) aufweist, welche einen Gluhstromdraht (31) satt fuhren kann.5. Component according to claim 4, characterized in that the bore (9 '') has a local taper (7), which can drove a Gluhstromdraht (31) fed.
6. Bauteil nach Anspruch 5, dadurch gekennzeichnet, dass die Verjüngung (7) naher an der Aussenseite (6b) als an der6. Component according to claim 5, characterized in that the taper (7) closer to the outside (6b) than at the
Innenseite (6a) des Isolationskorpers (6) ist.Inside (6 a) of the Isolationskorpers (6).
7. Bauteil nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass die Verjüngung (7) oder die engste Stelle der weiteren Bohrung (9'') exzentrisch durch den Isolati- onskorpers (6) verlauft.7. Component according to one of claims 4 to 6, characterized in that the taper (7) or the narrowest point of the further bore (9 '') eccentrically through the insulating onskorpers (6).
8. Bauteil gemass einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ubertragungskorper (5) und/oder der Isolationskorpers (6) mit ihren benachbarten Elektroden (4, 4') einteilig ausgestaltet sind.8. Component according to one of the preceding claims, characterized in that the Ubertragungskorper (5) and / or the Isolationskorpers (6) with their adjacent electrodes (4, 4 ') are designed in one piece.
9. Bauteil gemass einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Ubertragungskorper (5,) und/oder der Isolationskorpers (6) aus warme isolierendem Material besteht.9. Component according to one of the preceding claims, characterized in that the Ubertragungskorper (5,) and / or the Isolationskorpers (6) consists of warm insulating material.
10. Bauteil gemass einem der vorhergehenden Ansprüche, ge- kennzeichnet durch einen Gesamtdurchmesser von kleiner als 5 mm.10. Component according to one of the preceding claims, characterized by a total diameter of less than 5 mm.
11. Bauteil gemass einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich das Bauteil zum serienmassigem Einbau in einen Drucksensor für Verbrennungs- kraftmaschinen, insbesondere in eine Glühkerze (1) eignet .11. Component according to one of the preceding claims, characterized in that the component for serial installation in a pressure sensor for combustion engines, in particular in a glow plug (1) is suitable.
12. Bauteil gemäss einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es bis 2200C funktionstüchtig einsetzbar ist.12. Component according to one of the preceding claims, characterized in that it is operable up to 220 0 C.
13. Sensor umfassend ein Bauteil (2) gemäss einem der vorhergehenden Ansprüche zum Messen von Kräften oder Drücken.13. Sensor comprising a component (2) according to one of the preceding claims for measuring forces or pressures.
14. Sensor gemäss Anspruch 13, dadurch gekennzeichnet, dass der Sensor als Glühkerze (1) ausgebildet ist umfassend ein Gehäuse (24), einen Glühstift (20), einen Glühstromdraht (31), eine Fixierung (22) und ein Gewinde (27) .14. Sensor according to claim 13, characterized in that the sensor is designed as a glow plug (1) comprising a housing (24), a glow plug (20), a Glühstromdraht (31), a fixation (22) and a thread (27). ,
15. Sensor gemäss Anspruch 13 oder 14, dadurch gekennzeichnet, dass das Bauteil (2) zwischen dem Glühstift (20) und dem Gewinde (27), angeordnet ist.15. Sensor according to claim 13 or 14, characterized in that the component (2) between the glow plug (20) and the thread (27) is arranged.
16. Sensor gemäss einem der Ansprüche 13 bis 15, dadurch gekennzeichnet, dass das Bauteil 2 in einer Zwischenhülse angebracht sein, welche die Vorspannung aufbringt und vom Gehäuse 24, abgesehen von ihrer Befestigung daran, getrennt ist. 16. Sensor according to one of claims 13 to 15, characterized in that the component 2 may be mounted in an intermediate sleeve which applies the bias and is separated from the housing 24, apart from its attachment thereto.
EP08854262A 2007-11-26 2008-11-24 Part for measuring forces or pressures, and sensor comprising such a part Withdrawn EP2223066A2 (en)

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CH18342007 2007-11-26
PCT/CH2008/000490 WO2009067833A2 (en) 2007-11-26 2008-11-24 Part for measuring forces or pressures, and sensor comprising such a part

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EP2223066A2 true EP2223066A2 (en) 2010-09-01

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EP (1) EP2223066A2 (en)
JP (1) JP5544297B2 (en)
WO (1) WO2009067833A2 (en)

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US8074502B2 (en) 2011-12-13
WO2009067833A3 (en) 2010-03-04
US20100251808A1 (en) 2010-10-07
JP2011504587A (en) 2011-02-10
WO2009067833A2 (en) 2009-06-04
JP5544297B2 (en) 2014-07-09

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