EP3014185B1 - Sheathed glow plug - Google Patents

Sheathed glow plug Download PDF

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Publication number
EP3014185B1
EP3014185B1 EP14734764.5A EP14734764A EP3014185B1 EP 3014185 B1 EP3014185 B1 EP 3014185B1 EP 14734764 A EP14734764 A EP 14734764A EP 3014185 B1 EP3014185 B1 EP 3014185B1
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EP
European Patent Office
Prior art keywords
glow plug
contact
ceramic heating
heating pin
connecting bolt
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EP14734764.5A
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German (de)
French (fr)
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EP3014185A1 (en
Inventor
Hans-Juergen Brix
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3014185A1 publication Critical patent/EP3014185A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines

Definitions

  • the present invention relates to a glow plug for an internal combustion engine.
  • glow plugs with a ceramic heating pin are already known. So revealed the EP 1 707 883 A1 a glow plug with a ceramic heating pin, and a connecting bolt, wherein the electrical contact between the connecting bolt and the ceramic heating pin via an electrically conductive wire.
  • the electrically conductive wire is embedded in an insulating powder to avoid a short circuit due to contact of the electrically conductive wire with the housing.
  • an insulating powder is filled in the housing, which isolates the electrically conductive wire relative to the housing and causes a mechanical stabilization of the wire against vibrations.
  • the EP 2 306 089 A2 also discloses a glow plug with a ceramic heating pin and a connecting bolt, wherein the electrical contact between the terminal bolt and the ceramic heating pin via a contact element.
  • the glow plug according to the invention with the features of claim 1 offers the advantage that it allows a simplified contacting a ceramic glow pin, which can be produced easily and inexpensively waiving an insulating filler powder. Furthermore, the glow plug according to the invention is more robust against thermal and mechanical stress, since the connection via the contact element is more stable than the known wire connection. Due to the robust and rigid electrical connection between the connecting bolt and the ceramic heating pin, the filling of the housing of the glow plug with an insulating powder can be omitted, which saves at least one process step and thus significantly costs in the production and possibly accelerates the manufacturing process.
  • the second electrical contacting point By arranging the second electrical contacting point on a circumferential surface of the ceramic heating pin in combination with an axially displaceable electrical contacting of the contact element on the ceramic heating pin, a sliding contact of the contact element is formed at the second contacting point, whereby a length compensation by different thermal expansion of connecting bolt and ceramic heating pin allows becomes. Furthermore, no transverse forces acting on the contact element, so that even with a thermal relaxation during operation of the glow plug no lifting or bending away of the contact element is to be feared by the second electrical contact point. Thus, a permanently secure electrical contact of the ceramic heating pin is guaranteed.
  • the ceramic heating pin has a connection-side, the connecting bolt facing portion which has a reduced diameter compared to the remaining ceramic glow plug.
  • reducing the diameter in this section is provided radially to the section space in the housing, so that increases the distance between the section and a housing wall or arranged in the housing support tube. The greater distance results in a more space for the lateral contacting of the second electrical contact point on the peripheral surface of the ceramic heating pin, and on the other hand, the increased distance from the risk of electrical short circuit or sparking between the contact element and the support tube and / or reduced the housing.
  • the connecting bolt has a bore in which the contact element is fixed.
  • a hole is a simple and secure way to fix the contact element to the terminal bolt. It is particularly advantageous if the bore is centrally placed in a ceramic heating pin facing end face of the connecting bolt. Since the connecting bolt and the ceramic heating pin are arranged centrally and coaxially in the housing of the glow plug, the contact element can be fixed in any end position in the bore of the connecting bolt, whereby the assembly is simplified.
  • the contact element is screwed into the bore.
  • connection conductor is electrically conductively connected to a pin-shaped section in the bore of the connection bolt. This allows a secure, electrical connection between the connecting bolt and contact element can be realized.
  • the contact element has a contact sleeve and a connection conductor.
  • An advantageous development of the invention consists in that the contact element has a radially resilient contact sleeve and a connecting conductor. While the terminal conductor should be designed as stiff as possible to ensure precise fixation on the terminal bolt, the contact sleeve may be thinner and more flexible to allow better axial displacement with appropriate bias against the ceramic heating pin. By the radially resilient contact sleeve a secure sliding contact between the Kotaktelement and the second contacting point is made at the connection side portion of the heating pin.
  • the contact sleeve is centered by the ceramic heating pin, in particular by the connection-side section, so that a certain flexibility must be maintained in the contact element to compensate for any offsets due to assembly, mechanical forces during operation and / or different thermal expansions of the components.
  • the contact sleeve of the contact element receives the ceramic heating pin, in particular the connection-side section with the second contacting point.
  • the contact sleeve is slotted in the axial direction.
  • an axial slit creates an axially displaceable clamping contact between the terminal-side portion of the ceramic heating pin and the contact element in the nature of said sliding contact. As a result, the electrical connection is maintained even with different thermal expansions between the components to be contacted.
  • a preferably circumferential recess can be formed on the connecting bolt. Due to the peripheral recess, the insulating support element, which is also described below, but also sealing elements can be positioned in a form-fitting manner on the connection bolt.
  • a support tube may be arranged between the housing and the ceramic heating pin, the support tube extending coaxially with the housing on the inside up to at least the level of the connecting bolt, and wherein an insulating support element is arranged between the support tube and the connecting bolt. Due to the insulating support element, the connecting bolt is fixed to the housing in the housing. Furthermore, the insulating support element ensures electrical insulation between the connecting bolt and the housing, which is a prerequisite for the abandonment of an insulating powder filled in the housing.
  • an insulating support element may be arranged between the housing and the connecting bolt. This allows a glow plug according to the invention, which does not require a support tube, whereby the number of components is reduced.
  • a bead may be formed, wherein the bead presses the insulating support member against the terminal bolt.
  • the insulating support member is at least partially positively fixed at its radially outer lateral surface, which inhibits slipping of the insulating support member. It is particularly advantageous if the bead is formed on the support tube at the same height as the recess on the connecting bolt. Thus, a simple and secure fixation of the insulating support member is possible.
  • the connecting bolt can be formed in a non-inventive embodiment, a support surface which is supported on the insulating support member.
  • a support surface which is supported on the insulating support member.
  • Fig. 1 the combustion chamber side portion of a glow plug according to the invention is shown.
  • the glow plug has a housing 1, in which a connecting bolt 4 is arranged.
  • the glow plug also has a ceramic heating pin 2, which is arranged concentrically to the connecting bolt 4 in extension of a central axis of the glow plug. In this case, a combustion chamber-side tip of the ceramic heating pin 2 protrudes beyond the housing 1.
  • a support tube 3 is arranged, which is non-positively, positively and / or materially connected to the housing 1 and the ceramic heating pin 2.
  • the connecting bolt 4 has at its the ceramic heating pin 2 facing end face a bore 9, in which a contact element 8 is fixed.
  • the contact element 8 can be used in the bore 9 by means of soldering, welding or crimping electrically conductive. But it is also conceivable to screw the contact element 8 in the bore 9.
  • a first electrical contacting point 6 is present, which is electrically conductively connected via the support tube 3 to the housing 1 and serves for electrical connection to the negative pole. Furthermore, a connection-side section 5 is formed on the ceramic heating pin 2, wherein an end face of the connection-side section 5 is aligned in the direction of the connection pin 4. The connection-side section 5 has, for electrical connection to the positive pole, a second electrical contacting point 7, which lies on a peripheral surface of the connection-side section 5.
  • connection-side section 5 with the second electrical contacting point 7 is designed as a cylindrical extension of the ceramic heating pin 2 and has a reduced diameter compared with the remaining ceramic heating pin 2.
  • This embodiment is advantageous when the ceramic heating pin 2 is received in the support tube 3 in order to carry out a corresponding radial distance between the second electrical contacting point 7 and an inner wall of the support tube 3.
  • the contact element 8 is provided, which is connected at one end with a radially resilient portion axially displaceable on the connection-side section 5 with the second contact point 7 and at the other end fixed to the terminal bolt 4.
  • the radially resilient portion of the contact element 8 forms on the connection-side section 5 of the heating pin 2 from a sliding contact.
  • an electrically insulating support member 12 is arranged, which is fixed in the support tube 3. The fixation is carried out by means of a introduced in the support tube 3, circumferential bead 13 which presses in the elastically or plastically deformable support member 12.
  • the connecting bolt 4 is fixed to the housing within the support tube 3.
  • the contact element 8 has a radially resilient contact sleeve 8.1, which forms the radially resilient portion, and a substantially rigid terminal conductor 8.2.
  • the connecting conductor 8.2 is bent, so that an electrical conductor from the diameter of the contact sleeve 8.1 towards the bore 9 of the connecting bolt 4 is formed.
  • the connecting conductor 8.2 is inserted with a pin-shaped portion in the introduced at the ceramic heating pin 2 end face of the connecting bolt 4 bore 9, for example by means of soldering, welding or crimping electrically conductive.
  • the contact sleeve 8.1 is slotted in the axial direction, so that a radially resilient bias can be applied.
  • the contact sleeve 8.1 forms an axially displaceable clamping contact on the connection-side section 5 with the second electrical contacting point 7 in the manner of said sliding contact. As a result, the electrical connection is maintained even with different thermal expansions between the components to be contacted.
  • Fig. 2 another glow plug not according to the invention is disclosed. For the most part the same construction will be discussed below only on the differences.
  • the glow plug according to Fig. 2 dispenses with a support tube 3. Accordingly the first contacting point 6 of the ceramic heating pin 2 is connected directly to the housing 1. The electrical contacting of the negative pole thus takes place directly via the first contacting point 6 on the ceramic heating pin 2 and the housing 1. This results between ceramic heating pin 2 and housing, in particular in the region of the connection-side section 5 with the second electrical contacting 7 more space, so that can be dispensed with a diameter reduction of the ceramic heating pin 2 on the connection-side section 5. Further, a collar 11 is formed on the terminal bolt 4, which is supported on a heating pin side support surface on the insulating support member 12.
  • the insulating support member 12 is disposed between the housing 1 and the terminal bolt 4, wherein the bead 13 is formed for fixing the insulating support member 12 on the housing 1 and produces an at least partially positive connection.
  • About the collar 11 and the support surface of the connecting bolt 4 is locked by means of the housing-fixed, insulating support member 12 in the axial direction.
  • the insulating support member 12 may be bonded to the support tube 3 or to the housing 1 for fixing, wherein the shown, at least partially positive connection via the bead 13 is preferred.

Description

Die vorliegende Erfindung betrifft eine Glühstiftkerze für einen Verbrennungsmotor.The present invention relates to a glow plug for an internal combustion engine.

Stand der TechnikState of the art

Aus dem Stand der Technik sind bereits Glühstiftkerzen mit einem keramischen Heizstift bekannt. So offenbart die EP 1 707 883 A1 eine Glühstiftkerze mit einem keramischen Heizstift, und einem Anschlussbolzen, wobei die elektrische Kontaktierung zwischen dem Anschlussbolzen und dem keramischen Heizstift über einen elektrisch leitenden Draht erfolgt. Der elektrisch leitende Draht ist dabei in ein Isolationspulver eingebettet um einen Kurzschluss durch einen Kontakt des elektrisch leitenden Drahtes mit dem Gehäuse zu vermeiden. Bei diesen Glühstiftkerzen ist ein Isolationspulver in das Gehäuse eingefüllt, welches den elektrisch leitenden Draht gegenüber dem Gehäuse isoliert und dazu eine mechanische Stabilisierung des Drahtes gegen Erschütterungen bewirkt.From the prior art, glow plugs with a ceramic heating pin are already known. So revealed the EP 1 707 883 A1 a glow plug with a ceramic heating pin, and a connecting bolt, wherein the electrical contact between the connecting bolt and the ceramic heating pin via an electrically conductive wire. The electrically conductive wire is embedded in an insulating powder to avoid a short circuit due to contact of the electrically conductive wire with the housing. In these glow plugs an insulating powder is filled in the housing, which isolates the electrically conductive wire relative to the housing and causes a mechanical stabilization of the wire against vibrations.

Die EP 2 306 089 A2 offenbart ebenfalls eine Glühstiftkerze mit einem keramischen Heizstift und einem Anschlussbolzen, wobei die elektrische Kontaktierung zwischen dem Anschlussbolzen und dem keramischen Heizstift über ein Kontaktelement erfolgt.The EP 2 306 089 A2 also discloses a glow plug with a ceramic heating pin and a connecting bolt, wherein the electrical contact between the terminal bolt and the ceramic heating pin via a contact element.

Offenbarung der ErfindungDisclosure of the invention

Die erfindungsgemäße Glühstiftkerze mit den Merkmalen des Anspruchs 1 bietet demgegenüber den Vorteil, dass sie eine vereinfachte Kontaktierung eines keramischen Glühstifts ermöglicht, welche sich unter Verzicht auf ein isolierendes Füllpulver einfach und kostengünstig herstellen lässt. Ferner ist die erfindungsgemäße Glühstiftkerze robuster gegen thermischen und mechanischen Stress, da die Verbindung über das Kontaktelement stabiler ist als die bekannte Drahtverbindung. Durch die robuste und steife elektrische Verbindung zwischen Anschlussbolzen und dem keramischen Heizstift kann die Befüllung des Gehäuses der Glühstiftkerze mit einem Isolationspulver entfallen, was bei der Herstellung mindestens einen Prozessschritt und somit signifikant Kosten einspart und ggf. den Herstellungsprozess beschleunigt. Durch die Anordnung der zweiten elektrischen Kontaktierungsstelle an einer Umfangsfläche des keramischen Heizstifts in Kombination mit einer axial verschiebbaren elektrischen Kontaktierung des Kontaktelements am keramischen Heizstift wird ein Schleifkontakt des Kontaktelements an der zweiten Kontaktierungsstelle ausgebildet, wodurch ein Längenausgleich durch unterschiedliche thermische Ausdehnung von Anschlussbolzen und keramischem Heizstift ermöglicht wird. Ferner wirken keine Querkräfte auf das Kontaktelement, so dass auch bei einer thermischen Relaxation beim Betrieb der Glühstiftkerze kein Abheben oder Wegbiegen des Kontaktelements von der zweiten elektrischen Kontaktierungsstelle zu befürchten ist. Somit wird eine dauerhaft sichere elektrische Kontaktierung des keramischen Heizstiftes gewährleistet.The glow plug according to the invention with the features of claim 1 offers the advantage that it allows a simplified contacting a ceramic glow pin, which can be produced easily and inexpensively waiving an insulating filler powder. Furthermore, the glow plug according to the invention is more robust against thermal and mechanical stress, since the connection via the contact element is more stable than the known wire connection. Due to the robust and rigid electrical connection between the connecting bolt and the ceramic heating pin, the filling of the housing of the glow plug with an insulating powder can be omitted, which saves at least one process step and thus significantly costs in the production and possibly accelerates the manufacturing process. By arranging the second electrical contacting point on a circumferential surface of the ceramic heating pin in combination with an axially displaceable electrical contacting of the contact element on the ceramic heating pin, a sliding contact of the contact element is formed at the second contacting point, whereby a length compensation by different thermal expansion of connecting bolt and ceramic heating pin allows becomes. Furthermore, no transverse forces acting on the contact element, so that even with a thermal relaxation during operation of the glow plug no lifting or bending away of the contact element is to be feared by the second electrical contact point. Thus, a permanently secure electrical contact of the ceramic heating pin is guaranteed.

Durch die in den abhängigen Ansprüchen angeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im unabhängigen Anspruch angegebenen Glühstiftkerze möglich.The measures specified in the dependent claims advantageous refinements and improvements of the independent claim glow plug are possible.

Der keramische Heizstift weist einen anschlussseitigen, dem Anschlussbolzen zugewandten Abschnitt auf, welcher gegenüber dem restlichen keramischen Glühstift einen reduzierten Durchmesser aufweist. Durch die Reduzierung des Durchmessers in diesem Abschnitt wird radial zum Abschnitt Platz im Gehäuse geschaffen, so dass der Abstand zwischen dem Abschnitt und einer Gehäusewand oder einem im Gehäuse angeordneten Stützrohr vergrößert. Durch den größeren Abstand ergibt sich zum einen mehr Platz für die seitliche Kontaktierung der zweiten elektrischen Kontaktierungsstelle an der Umfangsfläche des keramischen Heizstifts, und zum anderen wird durch den vergrößerten Abstand die Gefahr eines elektrischen Kurzschlusses oder von Funkenschlag zwischen dem Kontaktelement und dem Stützrohr und/oder dem Gehäuse reduziert.The ceramic heating pin has a connection-side, the connecting bolt facing portion which has a reduced diameter compared to the remaining ceramic glow plug. By reducing the diameter in this section is provided radially to the section space in the housing, so that increases the distance between the section and a housing wall or arranged in the housing support tube. The greater distance results in a more space for the lateral contacting of the second electrical contact point on the peripheral surface of the ceramic heating pin, and on the other hand, the increased distance from the risk of electrical short circuit or sparking between the contact element and the support tube and / or reduced the housing.

Der Anschlussbolzen weist eine Bohrung auf, in welcher das Kontaktelement fixiert ist. Eine Bohrung ist eine einfache und sichere Möglichkeit, das Kontaktelement am Anschlussbolzen zu fixieren. Besonders vorteilhaft ist dabei, wenn die Bohrung zentrisch in einer dem keramischen Heizstift zugewandten Stirnseite des Anschlussbolzens eingebracht ist. Da der Anschlussbolzen und der keramische Heizstift zentrisch und koaxial in dem Gehäuse der Glühstiftkerze angeordnet sind, kann das Kontaktelement so in beliebiger Endlage in die Bohrung des Anschlussbolzens fixiert werden, wodurch die Montage vereinfacht wird.The connecting bolt has a bore in which the contact element is fixed. A hole is a simple and secure way to fix the contact element to the terminal bolt. It is particularly advantageous if the bore is centrally placed in a ceramic heating pin facing end face of the connecting bolt. Since the connecting bolt and the ceramic heating pin are arranged centrally and coaxially in the housing of the glow plug, the contact element can be fixed in any end position in the bore of the connecting bolt, whereby the assembly is simplified.

In einer bevorzugten Weiterbildung der Erfindung ist das Kontaktelement in die Bohrung eingeschraubt.In a preferred embodiment of the invention, the contact element is screwed into the bore.

Der Anschlussleiter ist mit einem stiftförmigen Abschnitt in der Bohrung des Anschlussbolzens elektrisch leitend verbunden. Dadurch kann eine sichere, elektrische Verbindung zwischen Anschlussbolzen und Kontaktelement realisiert werden.The connection conductor is electrically conductively connected to a pin-shaped section in the bore of the connection bolt. This allows a secure, electrical connection between the connecting bolt and contact element can be realized.

Das Kontaktelement weist eine Kontakthülse und einen Anschlussleiter auf. Eine vorteilhafte Weiterbildung der Erfindung besteht darin, dass das Kontaktelement eine radial federnde Kontakthülse und eine Anschlussleiter aufweist. Während der Anschlussleiter möglichst steif ausgelegt sein sollte, um eine präzise Fixierung am Anschlussbolzen zu gewährleisten, kann die Kontakthülse dünner und flexibler ausgebildet sein, um eine bessere axiale Verschiebbarkeit mit entsprechender Vorspannung gegenüber dem keramischen Heizstift zu ermöglichen. Durch die radial federnde Kontakthülse wird ein sicherer Schleifkontakt zwischen dem Kotaktelement und der zweiten Kontaktierungsstelle am anschlussseitigen Abschnitt des Heizstiftes hergestellt. Zusätzlich wird die Kontakthülse durch den keramischen Heizstift, insbesondere durch den anschlussseitigen Abschnitt zentriert, so dass in dem Kontaktelement eine gewisse Flexibilität gewahrt bleiben muss, um evtl. Versätze durch Montage, mechanische Kräfte im Betrieb und/oder unterschiedliche thermische Ausdehnungen der Bauteile zu kompensieren.The contact element has a contact sleeve and a connection conductor. An advantageous development of the invention consists in that the contact element has a radially resilient contact sleeve and a connecting conductor. While the terminal conductor should be designed as stiff as possible to ensure precise fixation on the terminal bolt, the contact sleeve may be thinner and more flexible to allow better axial displacement with appropriate bias against the ceramic heating pin. By the radially resilient contact sleeve a secure sliding contact between the Kotaktelement and the second contacting point is made at the connection side portion of the heating pin. In addition, the contact sleeve is centered by the ceramic heating pin, in particular by the connection-side section, so that a certain flexibility must be maintained in the contact element to compensate for any offsets due to assembly, mechanical forces during operation and / or different thermal expansions of the components.

Weiterhin ist mit Vorteil vorgesehen, dass die Kontakthülse des Kontaktelements den keramischen Heizstift, insbesondere den anschlussseitigen Abschnitt mit der zweiten Kontaktierungsstelle aufnimmt. Durch die Aufnahme der Kontaktierungsstelle wird die Gefahr eines Abrutschens oder eines Verbiegens des elektrischen Kontakts von Anschlussbolzen zur keramischen Glühstiftkerze verringert. Besonders vorteilhaft ist dabei, wenn die Kontakthülse in axialer Richtung geschlitzt ist. Durch eine axiale Schlitzung entsteht ein axial verschiebbarer Klemmkontakt zwischen am anschlussseitigen Abschnitt des keramischen Heizstifts und dem Kontaktelement in der Art des genannten Schleifkontaktes. Dadurch bleibt die elektrische Verbindung auch bei unterschiedlichen thermischen Ausdehnungen zwischen den zu kontaktierenden Bauteilen erhalten.Furthermore, it is advantageously provided that the contact sleeve of the contact element receives the ceramic heating pin, in particular the connection-side section with the second contacting point. By receiving the contact point, the risk of slipping or bending of the electrical contact of the connection pin to the ceramic glow plug is reduced. It is particularly advantageous if the contact sleeve is slotted in the axial direction. By an axial slit creates an axially displaceable clamping contact between the terminal-side portion of the ceramic heating pin and the contact element in the nature of said sliding contact. As a result, the electrical connection is maintained even with different thermal expansions between the components to be contacted.

Des Weiteren kann an dem Anschlussbolzen eine bevorzugt umlaufende Vertiefung ausgebildet sein. Durch die umlaufende Vertiefung können das im Folgenden noch beschriebene isolierende Stützelement, aber auch Dichtelemente formschlüssig an dem Anschlussbolzen positioniert werden. Zwischen dem Gehäuse und dem keramischen Heizstift kann ein Stützrohr angeordnet sein, wobei sich das Stützrohr koaxial zum Gehäuse innenliegend bis mindestens auf Höhe des Anschlussbolzens erstreckt, und wobei zwischen dem Stützrohr und dem Anschlussbolzen ein isolierendes Stützelement angeordnet ist. Durch das isolierende Stützelement wird der Anschlussbolzen gehäusefest im Gehäuse gelagert. Ferner sorgt das isolierende Stützelement für eine elektrische Isolation zwischen Anschlussbolzen und Gehäuse, was eine Voraussetzung für den Verzicht auf ein in das Gehäuse eingefülltes Isolationspulver ist.Furthermore, a preferably circumferential recess can be formed on the connecting bolt. Due to the peripheral recess, the insulating support element, which is also described below, but also sealing elements can be positioned in a form-fitting manner on the connection bolt. A support tube may be arranged between the housing and the ceramic heating pin, the support tube extending coaxially with the housing on the inside up to at least the level of the connecting bolt, and wherein an insulating support element is arranged between the support tube and the connecting bolt. Due to the insulating support element, the connecting bolt is fixed to the housing in the housing. Furthermore, the insulating support element ensures electrical insulation between the connecting bolt and the housing, which is a prerequisite for the abandonment of an insulating powder filled in the housing.

Alternativ kann in einer nicht erfindungsgemäßen Ausführungsform zwischen dem Gehäuse und dem Anschlussbolzen ein isolierendes Stützelement angeordnet sein. Dies ermöglicht eine erfindungsgemäße Glühstiftkerze, welche kein Stützrohr benötigt, wodurch die Zahl der Bauteile reduziert wird.Alternatively, in an embodiment not according to the invention, an insulating support element may be arranged between the housing and the connecting bolt. This allows a glow plug according to the invention, which does not require a support tube, whereby the number of components is reduced.

An dem Stützrohr oder an dem Gehäuse kann eine Sicke ausgebildet sein, wobei die Sicke das isolierende Stützelement gegen den Anschlussbolzen drückt. Durch die Sicke ist das isolierende Stützelement an seiner radial außenliegenden Mantelfläche zumindest teilweise formschlüssig fixiert, was ein Verrutschen des isolierenden Stützelementes hemmt. Insbesondere vorteilhaft ist dabei, wenn die Sicke am Stützrohr auf gleicher Höhe wie die Vertiefung am Anschlussbolzen ausgebildet ist. Somit ist eine einfache und sichere Fixierung des isolierenden Stützelements möglich.On the support tube or on the housing, a bead may be formed, wherein the bead presses the insulating support member against the terminal bolt. By the bead, the insulating support member is at least partially positively fixed at its radially outer lateral surface, which inhibits slipping of the insulating support member. It is particularly advantageous if the bead is formed on the support tube at the same height as the recess on the connecting bolt. Thus, a simple and secure fixation of the insulating support member is possible.

An dem Anschlussbolzen kann in einer nicht erfindungsgemäßen Ausführungsform eine Stützfläche ausgebildet sein, welche sich an dem isolierenden Stützelement abstützt. Durch das Abstützen der Stützfläche am isolierenden Stützelement kann die gehäusefeste Fixierung des Anschlussbolzens alternativ oder zusätzlich realisiert bzw. unterstützt werden.On the connecting bolt can be formed in a non-inventive embodiment, a support surface which is supported on the insulating support member. By supporting the support surface on the insulating support element, the housing-fixed fixing of the connecting bolt can alternatively or additionally be realized or supported.

Zeichnungendrawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert.

  • Fig. 1 zeigt eine erfindungsgemäße Glühstiftkerze mit einem keramischen Heizstift.
  • Fig. 2 zeigt eine andere nicht erfindungsgemäße Glühstiftkerze.
  • Fig. 3a und Fig. 3b zeigen das Kontaktelement einer Glühstiftkerze gemäß Fig. 1.
Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description.
  • Fig. 1 shows a glow plug according to the invention with a ceramic heating pin.
  • Fig. 2 shows another glow plug not according to the invention.
  • Fig. 3a and Fig. 3b show the contact element of a glow plug according to Fig. 1 ,

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Erfindung sowie vorteilhafte Ausgestaltungen gemäß den Merkmalen der weiteren Ansprüche werden im Folgenden anhand der in den Zeichnungen dargestellten Ausführungsbeispiele näher erläutert. Dabei sind gleiche Bauteile oder Bauteile mit gleicher Funktion mit den gleichen Bezugsziffern gekennzeichnet.The invention and advantageous embodiments according to the features of the other claims are explained in more detail below with reference to the embodiments illustrated in the drawings. The same components or components with the same function with the same reference numerals.

In Fig. 1 ist der brennraumseitige Abschnitt einer erfindungsgemäßen Glühstiftkerze dargestellt. Die Glühstiftkerze weist ein Gehäuse 1 auf, in dem ein Anschlussbolzen 4 angeordnet ist. Die Glühstiftkerze weist ferner einen keramischen Heizstift 2 auf, welcher konzentrisch zum Anschlussbolzen 4 in Verlängerung einer Mittelachse der Glühstiftkerze angeordnet ist. Dabei ragt eine brennraumseitige Spitze des keramischen Heizstiftes 2 über das Gehäuse 1 hinaus. Zwischen dem Gehäuse 1 und dem keramischen Heizstift 2 ist ein Stützrohr 3 angeordnet, welches kraftschlüssig, formschlüssig und/oder stoffschlüssig mit dem Gehäuse 1 und dem keramischen Heizstift 2 verbunden ist. Der Anschlussbolzen 4 weist an seiner dem keramischen Heizstift 2 zugewandten Stirnseite eine Bohrung 9 auf, in welche ein Kontaktelement 8 befestigt ist. Das Kontaktelement 8 kann in der Bohrung 9 mittels Löten, Schweißen oder Vercrimpen elektrisch leitend eingesetzt sein. Es ist aber auch denkbar, das Kontaktelement 8 in die Bohrung 9 einzuschrauben.In Fig. 1 the combustion chamber side portion of a glow plug according to the invention is shown. The glow plug has a housing 1, in which a connecting bolt 4 is arranged. The glow plug also has a ceramic heating pin 2, which is arranged concentrically to the connecting bolt 4 in extension of a central axis of the glow plug. In this case, a combustion chamber-side tip of the ceramic heating pin 2 protrudes beyond the housing 1. Between the housing 1 and the ceramic heating pin 2, a support tube 3 is arranged, which is non-positively, positively and / or materially connected to the housing 1 and the ceramic heating pin 2. The connecting bolt 4 has at its the ceramic heating pin 2 facing end face a bore 9, in which a contact element 8 is fixed. The contact element 8 can be used in the bore 9 by means of soldering, welding or crimping electrically conductive. But it is also conceivable to screw the contact element 8 in the bore 9.

An dem keramischen Heizstift 2 ist eine erste elektrische Kontaktierungsstelle 6 vorhanden, welche über das Stützrohr 3 mit dem Gehäuse 1 elektrisch leitend verbunden ist und zur elektrischen Verbindung mit dem Minus-Pol dient. Ferner ist an dem keramischen Heizstift 2 ein anschlussseitiger Abschnitt 5 ausgebildet, wobei eine Stirnfläche des anschlussseitigen Abschnitts 5 in Richtung des Anschlussbolzens 4 ausgerichtet ist. Der anschlussseitige Abschnitt 5 weist zur elektrischen Verbindung mit dem Plus-Pol eine zweite elektrische Kontaktierungsstelle 7 auf, welche an einer Umfangsfläche des anschlussseitigen Abschnitts 5 liegt.At the ceramic heating pin 2, a first electrical contacting point 6 is present, which is electrically conductively connected via the support tube 3 to the housing 1 and serves for electrical connection to the negative pole. Furthermore, a connection-side section 5 is formed on the ceramic heating pin 2, wherein an end face of the connection-side section 5 is aligned in the direction of the connection pin 4. The connection-side section 5 has, for electrical connection to the positive pole, a second electrical contacting point 7, which lies on a peripheral surface of the connection-side section 5.

Der anschlussseitige Abschnitt 5 mit der zweiten elektrischen Kontaktierungsstelle 7 ist als ein zylindrischer Fortsatz des keramischen Heizstifts 2 ausgeführt und weist gegenüber dem restlichen keramischen Heizstift 2 einen reduzierten Durchmesser auf. Diese Ausführung ist vorteilhaft, wenn der keramische Heizstift 2 in dem Stützrohr 3 aufgenommen ist, um einen entsprechenden radialen Abstand zwischen der zweiten elektrischen Kontaktierungsstelle 7 und einer Innenwand des Stützrohrs 3 auszuführen.The connection-side section 5 with the second electrical contacting point 7 is designed as a cylindrical extension of the ceramic heating pin 2 and has a reduced diameter compared with the remaining ceramic heating pin 2. This embodiment is advantageous when the ceramic heating pin 2 is received in the support tube 3 in order to carry out a corresponding radial distance between the second electrical contacting point 7 and an inner wall of the support tube 3.

Zur elektrischen Kontaktierung der zweiten elektrischen Kontaktierungsstelle 7 mit dem Anschlussbolzen 4 ist das Kontaktelement 8 vorgesehen, welches an einem Ende mit einem radial federnden Abschnitt axial verschiebbar am anschlussseitigen Abschnitt 5 mit der zweiten Kontaktierungsstelle 7 und am anderen Ende fest mit dem Anschlussbolzen 4 verbunden ist. Der radial federnde Abschnitt des Kontaktelements 8 bildet am anschlussseitigen Abschnitt 5 des Heizstiftes 2 einen Schleifkontakt aus. Mittels des Schleifkontakts werden Längenänderungen aufgrund unterschiedlicher thermischer Ausdehnungen ausgeglichen. Innerhalb des Stützrohres 3 ist ein elektrisch isolierendes Stützelement 12 angeordnet, das im Stützrohr 3 fixiert ist. Die Fixierung erfolgt mittels einer im Stützrohr 3 eingebrachten, umlaufenden Sicke 13, die in das elastisch oder plastisch verformbare Stützelement 12 drückt. Dadurch wird der Anschlussbolzen 4 innerhalb des Stützrohres 3 gehäusefest fixiert.For electrical contacting of the second electrical contact point 7 with the terminal bolt 4, the contact element 8 is provided, which is connected at one end with a radially resilient portion axially displaceable on the connection-side section 5 with the second contact point 7 and at the other end fixed to the terminal bolt 4. The radially resilient portion of the contact element 8 forms on the connection-side section 5 of the heating pin 2 from a sliding contact. By means of the sliding contact length changes due to different thermal expansions are compensated. Within the support tube 3, an electrically insulating support member 12 is arranged, which is fixed in the support tube 3. The fixation is carried out by means of a introduced in the support tube 3, circumferential bead 13 which presses in the elastically or plastically deformable support member 12. As a result, the connecting bolt 4 is fixed to the housing within the support tube 3.

Wie in den Figuren 3a und 3b zu sehen ist, weist das Kontaktelement 8 eine radial federnde Kontakthülse 8.1, welche den radial federnden Abschnitt bildet, und einen im Wesentlichen starren Anschlussleiter 8.2 auf. Der Anschlussleiter 8.2 ist gebogen ausgeführt, so dass ein elektrischer Leiter vom Durchmesser der Kontakthülse 8.1 hin zur Bohrung 9 des Anschlussbolzens 4 entsteht. Der Anschlussleiter 8.2 ist mit einem stiftförmigen Abschnitt in die an der dem keramischen Heizstift 2 zugewandten Stirnfläche des Anschlussbolzens 4 eingebrachte Bohrung 9 beispielsweise mittels Löten, Schweißen oder Vercrimpen elektrisch leitend eingesetzt. Die Kontakthülse 8.1 ist in axialer Richtung geschlitzt, so dass eine radial federnde Vorspannung aufgebracht werden kann. Durch die radiale Vorspannung bildet die Kontakthülse 8.1 einen axial verschiebbaren Klemmkontakt am anschlussseitigen Abschnitt 5 mit der zweiten elektrischen Kontaktierungsstelle 7 in der Art des genannten Schleifkontakts aus. Dadurch bleibt die elektrische Verbindung auch bei unterschiedlichen thermischen Ausdehnungen zwischen den zu kontaktierenden Bauteilen erhalten.As in the FIGS. 3a and 3b can be seen, the contact element 8 has a radially resilient contact sleeve 8.1, which forms the radially resilient portion, and a substantially rigid terminal conductor 8.2. The connecting conductor 8.2 is bent, so that an electrical conductor from the diameter of the contact sleeve 8.1 towards the bore 9 of the connecting bolt 4 is formed. The connecting conductor 8.2 is inserted with a pin-shaped portion in the introduced at the ceramic heating pin 2 end face of the connecting bolt 4 bore 9, for example by means of soldering, welding or crimping electrically conductive. The contact sleeve 8.1 is slotted in the axial direction, so that a radially resilient bias can be applied. Due to the radial prestressing, the contact sleeve 8.1 forms an axially displaceable clamping contact on the connection-side section 5 with the second electrical contacting point 7 in the manner of said sliding contact. As a result, the electrical connection is maintained even with different thermal expansions between the components to be contacted.

In Fig. 2 ist eine andere nicht erfindungsgemäße Glühstiftkerze offenbart. Bei weitestgehend gleichem Aufbau wird im Folgenden nur auf die Unterschiede eingegangen. Die Glühstiftkerze gemäß Fig. 2 verzichtet auf ein Stützrohr 3. Dementsprechend ist die erste Kontaktierungsstelle 6 des keramischen Heizstiftes 2 unmittelbar mit dem Gehäuse 1 verbunden. Die elektrische Kontaktierung des Minus-Pols erfolgt also direkt über die erste Kontaktierungsstelle 6 am keramischen Heizstift 2 und das Gehäuse 1. Dadurch entsteht zwischen keramischem Heizstift 2 und Gehäuse, insbesondere im Bereich des anschlussseitigen Abschnitts 5 mit der zweiten elektrischen Kontaktierungsstelle 7 mehr Platz, so dass auf eine Durchmesserreduktion des keramischen Heizstifts 2 an dem anschlussseitigen Abschnitt 5 verzichtet werden kann. Ferner ist am Anschlussbolzen 4 ein Bund 11 ausgebildet, welcher sich an einer heizstiftseitigen Stützfläche an dem isolierenden Stützelement 12 abstützt. Das isolierende Stützelement 12 ist dabei zwischen dem Gehäuse 1 und dem Anschlussbolzen 4 angeordnet, wobei die Sicke 13 zur Fixierung des isolierenden Stützelements 12 am Gehäuse 1 ausgebildet ist und eine zumindest teilweise formschlüssige Verbindung herstellt. Über den Bund 11 und die Stützfläche ist der Anschlussbolzen 4 mittels des gehäusefesten, isolierenden Stützelements 12 in axialer Richtung arretiert.In Fig. 2 another glow plug not according to the invention is disclosed. For the most part the same construction will be discussed below only on the differences. The glow plug according to Fig. 2 dispenses with a support tube 3. Accordingly the first contacting point 6 of the ceramic heating pin 2 is connected directly to the housing 1. The electrical contacting of the negative pole thus takes place directly via the first contacting point 6 on the ceramic heating pin 2 and the housing 1. This results between ceramic heating pin 2 and housing, in particular in the region of the connection-side section 5 with the second electrical contacting 7 more space, so that can be dispensed with a diameter reduction of the ceramic heating pin 2 on the connection-side section 5. Further, a collar 11 is formed on the terminal bolt 4, which is supported on a heating pin side support surface on the insulating support member 12. The insulating support member 12 is disposed between the housing 1 and the terminal bolt 4, wherein the bead 13 is formed for fixing the insulating support member 12 on the housing 1 and produces an at least partially positive connection. About the collar 11 and the support surface of the connecting bolt 4 is locked by means of the housing-fixed, insulating support member 12 in the axial direction.

Alternativ oder zusätzlich kann das isolierende Stützelement 12 mit dem Stützrohr 3 oder mit dem Gehäuse 1 zur Fixierung verklebt werden, wobei die gezeigte, zumindest teilweise formschlüssige Verbindung über die Sicke 13 bevorzugt ist.Alternatively or additionally, the insulating support member 12 may be bonded to the support tube 3 or to the housing 1 for fixing, wherein the shown, at least partially positive connection via the bead 13 is preferred.

Claims (6)

  1. Glow plug for an internal combustion engine, having a housing (1) in which there is arranged a connecting bolt (4), and having a ceramic heating pin (2), the ceramic heating pin (2) having a first electric contact point (6) and a second electric contact point (7), the first electric contact point (6) of the heating pin (2) being at least indirectly connected to the housing (1) of the glow plug, and the second contact point (7) being connected electrically to the connecting bolt (4) via a contact element (8),
    the second electric contact point (7) being formed on a circumferential surface of a section (5) on the connection side of the ceramic heating pin (2),
    the connection-side section (5) having a reduced diameter as compared with the remaining ceramic heating pin (2), and the contact element (8) having a section which, on the circumferential surface of the connection-side section (5), implements an axially displaceable electric contact with the second contact point (7), characterized in that
    the contact element (8) has a contact sleeve (8.1) and a connecting conductor (8.2), and in that the connecting bolt (4) has a bore (9) in which the contact element (8) is fixed,
    wherein
    the connecting conductor (8.2) is electrically conductively connected to a pin-like section in the bore (9) of the connecting bolt (4).
  2. Glow plug according to Claim 1, characterized in that the contact element (8) is screwed into the bore (9).
  3. Glow plug according to one of the preceding claims, characterized in that the connecting conductor (8.2) is of bent design.
  4. Glow plug according to one of the preceding claims, characterized in that the bore (9) is introduced centrally into an end face of the connecting bolt (4) which faces the ceramic heating pin (2).
  5. Glow plug according to one of the preceding claims, characterized in that the contact sleeve (8.1) is designed to be radially springy and, axially displaceably on the connection-side section (5), forms a wiping contact on the second contact point (7).
  6. Glow plug according to one of the preceding claims, characterized in that the contact sleeve (8.1) is slotted in the axial direction.
EP14734764.5A 2013-06-26 2014-06-18 Sheathed glow plug Active EP3014185B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013212260.8A DE102013212260A1 (en) 2013-06-26 2013-06-26 glow plug
PCT/EP2014/062876 WO2014206845A1 (en) 2013-06-26 2014-06-18 Sheathed glow plug

Publications (2)

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EP3014185A1 EP3014185A1 (en) 2016-05-04
EP3014185B1 true EP3014185B1 (en) 2019-02-20

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EP14734764.5A Active EP3014185B1 (en) 2013-06-26 2014-06-18 Sheathed glow plug

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EP (1) EP3014185B1 (en)
JP (1) JP6111379B2 (en)
DE (1) DE102013212260A1 (en)
WO (1) WO2014206845A1 (en)

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JPWO2019004286A1 (en) * 2017-06-28 2019-12-12 京セラ株式会社 heater

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Publication number Priority date Publication date Assignee Title
US4475030A (en) * 1981-09-25 1984-10-02 Caterpillar Tractor Co. Glow plug having resiliently mounted ceramic surface-ignition element
US4661686A (en) * 1984-04-12 1987-04-28 Ngk Spark Plug Co., Ltd Dual line ceramic glow plug
JP4672910B2 (en) * 2001-06-07 2011-04-20 日本特殊陶業株式会社 Glow plug manufacturing method
JP4677140B2 (en) * 2001-08-13 2011-04-27 日本特殊陶業株式会社 Glow plug
JP2003130349A (en) * 2001-10-24 2003-05-08 Denso Corp Glow plug
WO2005061963A1 (en) 2003-12-19 2005-07-07 Bosch Corporation Ceramic heater-type glow plug
JP4348317B2 (en) * 2004-06-29 2009-10-21 日本特殊陶業株式会社 Glow plug
JP4996283B2 (en) * 2006-05-18 2012-08-08 日本特殊陶業株式会社 Ceramic heater and glow plug
JP5324905B2 (en) * 2008-12-11 2013-10-23 日本特殊陶業株式会社 Glow plug
JP2011017478A (en) * 2009-07-08 2011-01-27 Ngk Spark Plug Co Ltd Glow plug
JP4851570B2 (en) * 2009-09-09 2012-01-11 日本特殊陶業株式会社 Glow plug
DE102009048643B4 (en) * 2009-09-30 2013-11-28 Borgwarner Beru Systems Gmbh Glow plug and method for connecting a pin made of a functional ceramic with a metal sleeve
JP5552920B2 (en) * 2010-06-25 2014-07-16 株式会社デンソー Ceramic heater

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JP6111379B2 (en) 2017-04-05
DE102013212260A1 (en) 2014-12-31
WO2014206845A1 (en) 2014-12-31
JP2016525202A (en) 2016-08-22
EP3014185A1 (en) 2016-05-04

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