EP0937945B1 - Sheathed-element glow plug - Google Patents
Sheathed-element glow plug Download PDFInfo
- Publication number
- EP0937945B1 EP0937945B1 EP99100628A EP99100628A EP0937945B1 EP 0937945 B1 EP0937945 B1 EP 0937945B1 EP 99100628 A EP99100628 A EP 99100628A EP 99100628 A EP99100628 A EP 99100628A EP 0937945 B1 EP0937945 B1 EP 0937945B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glow plug
- sheathed
- seal
- tubular element
- connecting stud
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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 invention is based on a glow plug Arrangement in the combustion chamber of air-compressing internal combustion engines according to the type of the main claim
- a glow plug is already known from document US-A-4 281 451 known.
- the Round connector forms by force and / or form-fitting Connection the connecting element between the Connection pin of the glow plug and the plug of the engine side harness.
- the metallic and therefore conductive material of the circular connector also serves the contacting and power supply between the wiring harness and the connecting bolt.
- the insulating washer made of temperature-resistant and electrical Non-conductive material is used for electrical insulation between candle housing and round plug.
- the so-called Double seal is used in addition to the electrical insulation between the candle housing and the round plug as well as the centering the connecting bolt in the candle housing mainly the Sealing the inside of the candle case against the Surroundings.
- the double seal is both by a Sealing surface to the inside of the candle housing as well Characterized sealing surface to the connecting bolt. Out of it to recognize that there are three different components different material are necessary.
- the glow plug according to the invention with the characteristic has the advantage that for the above functions and requirements only a single component - the so-called insulating sleeve - is required becomes.
- This component can be made of electrically insulating Material or electrically conductive material with electrically insulating coating exist.
- this component can have both the sealing function compared to the candle housing and the connecting bolt as well the centering function of the connecting bolt compared to Ensure candle housing.
- the electrical contact between the connector of the engine side wiring harness and the Glow plugs can be plugged in directly the end protruding from the sleeve-shaped insulating sleeve of the metallic connecting bolt.
- the Plug can be in addition to the described friction of the plug contact by an appropriately designed Positive locking element fixed to the outer jacket of the insulating sleeve become.
- FIG Glow plug in Figure 2 on an enlarged scale Individual part according to the invention in half-longitudinal section.
- the glow plug 10 consists in a known manner of a tubular candle housing 11 made of metallic and therefore electrically conductive material.
- a connection pin 12 In the longitudinal bore 11A of the candle housing 11 is a connection pin 12 with the same axis used.
- the connecting bolt protrudes with its upper end out of the candle housing and serves to contact the motor-side connector and the Power supply.
- the tubular element 15 is such about the Terminal bolt 12 inserted into the candle housing 11 that both a contact surface between the tubular element and the Connection bolts as well as a contact surface between the Pipe element 15 and the inner contour of the longitudinal bore 11A of the Candle housing is formed.
- the contact area can by pressing with subsequent axial fixation of the Inner and / or outer edge of the tubular element in the area of into the inside of the candle housing facing towards you Cone on the inner bore of the candle housing and / or the Connection bolts are generated.
- the pipe element according to Embodiment Figure 1 or Figure 2 points as Joint connection to the connecting bolt 12 has an internal thread 16 on. This goes in the inside of the candle housing End of the tubular element in a bore with a Inside diameter greater than that of the Thread diameter is. The seal after this As already mentioned, the exemplary embodiment takes place via the inner and outer sealing surface (sealing surface) 18, 19 of the ins Candle housing inside directed end of the raw element.
- the tubular element according to embodiment 2 has two cylindrical surfaces on the inside and outside diameter, either directly through press fits or indirectly through Joining aids of the above methods as Joint connection with sealing function.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
- Connector Housings Or Holding Contact Members (AREA)
Description
Die Erfindung geht aus von einer Glühstiftkerze zur Anordnung im Brennraum luftverdichtender Brennkraftmaschinen nach der Gattung des Hauptanspruchs Eine solche glühstiftkerze ist aus Dokument US-A-4 281 451 schon bekannt. Bei derartigen bekannten Glühstiftkerzen erfüllen im oberen Bereich zwischen Anschlußbolzen und Glühstiftkerze im wesentlichen die drei Bauteile Rundstecker (Rundmutter), Isolierscheibe und Doppeldichtung unterschiedliche Funktionen. Der Rundstecker bildet durch Kraft und/oder formschlüssige Verbindung das Verbindungselement zwischen dem Anschlußbolzen der Glühstiftkerze und dem Stecker des motorseitigen Kabelbaums. Der metallische und dadurch leitfähige Werkstoff des Rundsteckers dient darüberhinaus der Kontaktierung und Stromzuführung zwischen dem Kabelbaum und dem Anschlußbolzen.The invention is based on a glow plug Arrangement in the combustion chamber of air-compressing internal combustion engines according to the type of the main claim Such a glow plug is already known from document US-A-4 281 451 known. With such known glow plugs meet in the upper area between the connecting pin and glow plug essentially the three components round plug (round nut), insulating washer and double seal different functions. The Round connector forms by force and / or form-fitting Connection the connecting element between the Connection pin of the glow plug and the plug of the engine side harness. The metallic and therefore conductive material of the circular connector also serves the contacting and power supply between the wiring harness and the connecting bolt.
Die Isolierscheibe aus temperaturbeständigem und elektrisch nicht leitendem Werkstoff dient der elektrischen Isolation zwischen Kerzengehäuse und Rundstecker. Die sogenannte Doppeldichtung dient neben der elektrischen Isolation zwischen Kerzengehäuse und Rundstecker sowie der Zentrierung des Anschlußbolzens im Kerzengehäuse hauptsächlich der Abdichtung des Inneren des Kerzengehäuses gegenüber der Umgebung. Die Doppeldichtung ist sowohl durch eine Dichtfläche zum Inneren des Kerzengehäuses als auch einer Dichtfläche zum Anschlußbolzen charakterisiert. Daraus ist zu erkennen, daß hierfür drei verschiedene Bauteile unterschiedlichen Werkstoffs notwendig sind.The insulating washer made of temperature-resistant and electrical Non-conductive material is used for electrical insulation between candle housing and round plug. The so-called Double seal is used in addition to the electrical insulation between the candle housing and the round plug as well as the centering the connecting bolt in the candle housing mainly the Sealing the inside of the candle case against the Surroundings. The double seal is both by a Sealing surface to the inside of the candle housing as well Characterized sealing surface to the connecting bolt. Out of it to recognize that there are three different components different material are necessary.
Die erfindungsgemäße Glühstiftkerze mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß für die obengenannten Funktionen und Anforderungen nur ein einziges Bauteil -die sogenannte Isolierhülse- benötigt wird. Dieses Bauteil kann aus elektrisch isolierendem Werkstoff oder elektrisch leitfähigem Werkstoff mit elektrisch isolierender Beschichtung bestehen.The glow plug according to the invention with the characteristic In contrast, features of the main claim have the advantage that for the above functions and requirements only a single component - the so-called insulating sleeve - is required becomes. This component can be made of electrically insulating Material or electrically conductive material with electrically insulating coating exist.
Weiterhin kann dieses Bauteil sowohl die Dichtfunktion gegenüber dem Kerzengehäuse und dem Anschlußbolzen als auch die Zentrierfunktion des Anschlußbolzens gegenüber dem Kerzengehäuse gewährleisten. Der elektrische Kontakt zwischen dem Stecker des motorseitigen Kabelbaums und der Glühstiftkerze kann durch einen direkten Steckkontakt mit dem aus der hülsenförmigen Isolierhülse herausragenden Ende des metallischen Anschlußbolzens verwirktlicht werden. Der Stecker kann dabei zusätzlich zum beschriebenen Reibschluß des Steckkontakts durch ein entsprechend gestaltetes Formschlußelement am Außenmantel der Isolierhülse fixiert werden.Furthermore, this component can have both the sealing function compared to the candle housing and the connecting bolt as well the centering function of the connecting bolt compared to Ensure candle housing. The electrical contact between the connector of the engine side wiring harness and the Glow plugs can be plugged in directly the end protruding from the sleeve-shaped insulating sleeve of the metallic connecting bolt. The Plug can be in addition to the described friction of the plug contact by an appropriately designed Positive locking element fixed to the outer jacket of the insulating sleeve become.
Die Reduzierung der Teilevielfalt von bislang drei auf ein einziges Bauteil ermöglicht eine einfachere und kostengünstigere Montage durch Reduzierung der Anzahl der Montageoperationen und Prüfschritte. Der Ersatz der bislang drei Bauteile, Rundstecker (Rundmutter), Isolierscheibe und Doppeldichtung durch ein einziges Bauteil ermöglicht, außerdem eine deutiche Reduzierung der Stoffkosten.Reducing the number of parts from three to one single component enables a simpler and less expensive assembly by reducing the number of Assembly operations and test steps. The replacement of the so far three components, round plug (round nut), insulating washer and Double sealing made possible by a single component also a significant reduction in material costs.
Die Zeichnung zeigt in Figur 1 einen Teillängsschnitt einer Glühstiftkerze, in Figur 2 in vergrößertem Maßstab das erfindungsgemäße Einzelteil im Halb-Längsschnitt.The drawing shows a partial longitudinal section in FIG Glow plug, in Figure 2 on an enlarged scale Individual part according to the invention in half-longitudinal section.
Die Glühstiftkerze 10 besteht in bekannter Weise aus einem
rohrförmigen Kerzengehäuse 11 aus metallischem und damit
elektrisch leitfähigen Werkstoff. In der Längsbohrung 11A
des Kerzengehäuses 11 ist achsgleich ein Anschlußbolzen 12
eingesetzt. Außerdem befindet sich im Kerzengehäuse 11 ein
in der Regel eingepreßter Glühstift 13. Der Anschlußbolzen
ragt mit seinem oberen Ende aus dem Kerzengehäuse heraus und
dient der Kontaktierung des motorseitigen Steckers sowie der
Stromzuführung.The glow plug 10 consists in a known manner of a
Das erfindungsgemäße Rohrelement 15 wird derart über den
Anschlußbolzen 12 in das Kerzengehäuse 11 eingeführt, daß
sowohl eine Kontaktfläche zwischen dem Rohrelement und dem
Anschlußbolzen als auch eine Kontaktfläche zwischen dem
Rohrelement 15 und der Innenkontur der Längsbohrung 11A des
Kerzengehäuses ausgebildet wird. Die Kontaktfläche kann
durch Anpressen mit anschließender axialer Fixierung der
Innen- und/oder Außenkante des Rohrelements im Bereich der
in das Kerzengehäuseinnere weisenden Stirnfläche gegen einen
Konus an der Innenbohrung des Kerzengehäuses und/oder des
Anschlußbolzens erzeugt werden.The
Diese Kontaktflächen an der inneren und äußeren
Manteloberfläche des Rohrelements 15 dienen der Zentrierung
des oberen Bereichs des Anschlußbolzens bezüglich der
Längsbohrung 11A sowie der Abdichtung des Inneren des
Kerzengehäuses gegenüber der Umgebung. Hierzu wird auf Figur
2 verwiesen, in welcher unten am Rohrelement eine äußere
Dichtfläche 18 und eine innere Dichtfläche 19 zu erkennen
sind. Die Abdichtung erfolgt hier also direkt durch das
Rohrelement, kann aber durch ein, je nach Art des
eingesetzten Fügeverfahrens, verwendetes Fügehilfsmittel,
wie z.B. Klebstoff erfolgen. Die Figur 2 zeigt in
vergrößertem Maßstab das Rohrelement 15 nach dem
Ausführungsbeispiel der Figur 1. Dieses Bauteil kann aus
elektrisch isolierendem Werkstoff oder elektrisch
leitfähigem Werkstoff mit elektrisch isolierender
Beschichtung hergestellt sein. Am Außenumfang des aus dem
Kerzengehäuse 11 herausragenden Bereichs des Rohrelements 15
ist ein umlaufender Wulst 23 beliebiger Geometrie
ausgebildet, welcher als Formschlußelement für den Stecker
des motorseitigen Kabelbaums dient. Das Rohrelement gemäß
Ausführungsbeispiel Figur 1 bzw. Figur 2 weist als
Fügeverbindung zum Anschlußbolzen 12 ein Innengewinde 16
auf. Dieses geht in dem ins Kerzengehäuseinnere gerichteten
Ende des Rohrelements in eine Bohrung mit einem
Innendurchmesser über, der größer als der des
Gewindedurchmessers ist. Die Abdichtung nach diesem
Ausführungsbeispiel erfolgt -wie bereits erwähnt- über die
innere und äußere Dichtfläche (Dichtfläche) 18, 19 des ins
Kerzengehäuseinnere gerichteten Endes des Rohelements.These contact surfaces on the inner and outer
Shell surface of the
Das Rohrelement gemäß Ausführungsbeispiel 2 weist zwei zylinderförmige Flächen am Innen- und Außendurchmesser auf, die entweder direkt durch Preßpassungen oder indirekt durch Fügehilfsmittel der oben genannten Verfahren als Fügeverbindung mit Dichtfunktion wirken.The tubular element according to embodiment 2 has two cylindrical surfaces on the inside and outside diameter, either directly through press fits or indirectly through Joining aids of the above methods as Joint connection with sealing function.
Claims (7)
- Sheathed-element glow plug (10) for arrangement in the combustion space of air-compressing internal combustion engines, having a tubular, metallic glow plug housing (11) in whose longitudinal bore (11A) a sheathed element (13) is secured by part of its length in a seal-forming way, and with a connecting stud which serves to conduct current, characterized in that the connecting stud (12) is connected to the glow plug housing in a seal-forming way by means of a one-piece tubular element (15) which has two seal-forming faces (18, 19) at its end which is located at the glow plug housing (11), and a positively locking element (23) for the plug of the cable harness at the engine end on the external surface of its casing.
- Sheathed-element glow plug according to Claim 1, characterized in that the seal-forming connection (16) between the connecting stud (12) and tubular element (15) is a thread.
- Sheathed-element glow plug according to Claim 1, characterized in that the connection (16) between the connecting stud (12) and tubular element (15) is a welded, bonded, press-in or caulked connection.
- Sheathed-element glow plug according to one of Claims 1 to 3, characterized in that the positively locking element (23) is a bead (23) which has any desired geometry and which is formed on the outside of the tubular element (15), and is at the same time securing means for the plug of the cable harness at the engine end.
- Sheathed-element glow plug according to one of Claims 1 to 4, characterized in that one external seal-forming face (18) and one internal seal-forming face (19) are formed on the internal end side of the tubular element (15).
- Sheathed-element glow plug according to one of Claims 1 to 5, characterized in that the tubular element (15) also forms an electrical insulation between the connecting stud (12) and glow plug housing (11).
- Sheathed-element glow plug according to one of Claims 1 to 6, characterized in that the tubular element (15) is also a means for centring the connecting stud with respect to the glow plug housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19805578A DE19805578C1 (en) | 1998-02-12 | 1998-02-12 | Glow pin plug for internal combustion engine |
| DE19805578 | 1998-02-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0937945A1 EP0937945A1 (en) | 1999-08-25 |
| EP0937945B1 true EP0937945B1 (en) | 2003-05-14 |
Family
ID=7857396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99100628A Expired - Lifetime EP0937945B1 (en) | 1998-02-12 | 1999-01-14 | Sheathed-element glow plug |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0937945B1 (en) |
| JP (1) | JPH11281058A (en) |
| DE (2) | DE19805578C1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3021094A1 (en) * | 2014-05-13 | 2015-11-20 | Bosch Gmbh Robert | PREHEATING ELECTRODE WITH INSULATION SEAL |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53141840A (en) * | 1977-05-16 | 1978-12-11 | Ngk Spark Plug Co Ltd | Manufacturing method of sheathed glow plug |
| US4281451A (en) * | 1978-02-10 | 1981-08-04 | General Motors Corporation | Electric heater -method of making |
| US4475030A (en) * | 1981-09-25 | 1984-10-02 | Caterpillar Tractor Co. | Glow plug having resiliently mounted ceramic surface-ignition element |
| JPS59231321A (en) * | 1983-06-13 | 1984-12-26 | Ngk Spark Plug Co Ltd | Self-control type glow plug |
| IT235871Y1 (en) * | 1995-05-31 | 2000-07-18 | Cooper Ind Inc | SELF-CLEANING OSCILLATING GASKET FOR AN ARMORED RESISTANCE OF A PRE-HEATING CANDLE FOR DIESEL ENGINES |
-
1998
- 1998-02-12 DE DE19805578A patent/DE19805578C1/en not_active Expired - Fee Related
-
1999
- 1999-01-14 EP EP99100628A patent/EP0937945B1/en not_active Expired - Lifetime
- 1999-01-14 DE DE59905520T patent/DE59905520D1/en not_active Expired - Fee Related
- 1999-02-10 JP JP11032753A patent/JPH11281058A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0937945A1 (en) | 1999-08-25 |
| DE59905520D1 (en) | 2003-06-18 |
| DE19805578C1 (en) | 1999-04-22 |
| JPH11281058A (en) | 1999-10-15 |
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