EP1034399A1 - Pencil type glow plug - Google Patents

Pencil type glow plug

Info

Publication number
EP1034399A1
EP1034399A1 EP98962285A EP98962285A EP1034399A1 EP 1034399 A1 EP1034399 A1 EP 1034399A1 EP 98962285 A EP98962285 A EP 98962285A EP 98962285 A EP98962285 A EP 98962285A EP 1034399 A1 EP1034399 A1 EP 1034399A1
Authority
EP
European Patent Office
Prior art keywords
glow plug
diameter
annular gap
candle housing
housing
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.)
Granted
Application number
EP98962285A
Other languages
German (de)
French (fr)
Other versions
EP1034399B1 (en
Inventor
Johannes Locher
Werner Teschner
Steffen Schott
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1034399A1 publication Critical patent/EP1034399A1/en
Application granted granted Critical
Publication of EP1034399B1 publication Critical patent/EP1034399B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 relates to a glow plug
  • Combustion chamber facing cylindrical bore realized in the candle housing. This bore is characterized by a diameter that is larger than the interference fit diameter of the glow plug.
  • the glow plug according to the invention with the characterizing features of the main claim has the task of largely thermally decoupling the glow plug at the corresponding annular gap depth and thus ensuring the desired heating characteristic.
  • the depth of the annular gap must be adapted to the projection dimension for a standard pencil with the same geometry and heating characteristics. This results in a large variety of parts of the candle housing, which only vary due to the depth of the annular gap.
  • the main advantage is that, in contrast to the prior art, the annular gap is realized by a glow plug, correspondingly offset in the area of the press fit, with a widened diameter and a candle housing without a graduated diameter. This allows the
  • Number of candle housings which vary in their geometry only by the depth of the annular gap, can be reduced to a housing that can be used universally for this feature.
  • a standard pin of constant geometry can still be used
  • FIGS. 2 and 3 show a glow plug, partly in longitudinal section, in FIGS. 2 and 3 on an enlarged scale the annular gap zone designated by X.
  • the glow plug 10 consists of an elongated, cylindrical housing 11 with a central bore 12, which has a conical extension 13 towards the upper end. Somewhat below this extension, an annular shoulder 15 is formed on the bore 12, namely in that the diameter of the bore 12 above this paragraph 15 is slightly smaller than the diameter in the subsequent region 12 A of the bore 12.
  • the Glow plug 16 which dips with its tip 17 into the combustion chamber of the engine.
  • the joint between glow plug and candle housing has so far been designed as a press fit 12 A with a constant bore diameter on the combustion chamber side.
  • the projection dimension V of the glow plug 16 of the glow plug candle is defined as the distance between the radiator tip and the test diameter on the sealing cone of the candle housing.
  • the construction of the glow plug has not been discussed further, since it is not essential to the invention. It can expediently be pressed into the bore 12.
  • Glow tube of the glow plug arranged filament is also not shown.
  • the connecting bolt 18 protruding from the candle housing 11 serves to supply current to the current coil.
  • the connecting pin 18 is fixed by means of a radially pressed seal 20 in the upper, tubular region of the glow plug 16, which is not further shown.
  • the seal 20 seals the glow plug 16 between the glow tube and the connecting pin 18 from the environment.
  • the annular shoulder 15 on the housing 11 has the purpose that the glow plug 16 together with the connecting pin 18 at too high pressure in
  • FIGS. 2 and 3 show the area of the annular gap 21 or the annular gap zone between the candle housing and glow plug which is relevant to the invention. This zone is realized between the constant interference fit diameter of the candle housing on the combustion chamber side and a glow plug which is offset in the outer diameter within the candle housing.
  • the area of the glow plug on the combustion chamber side below a shoulder 16 B has a smaller diameter 16 C than that of the press fit area 12 A.
  • Figure 2 shows the arrangement of the glow plug according to the invention in the candle housing to produce an annular gap depth R1.
  • FIG. 3 shows the arrangement of the glow plug according to the invention in the candle housing to produce an annular gap depth R2.
  • the glow plugs according to Figures 2 and 3 can have the same geometry and heating characteristics, i.e.
  • a standard glow plug can be used to implement different annular gap depths (here: Rl> R2) and thus different projection dimensions (here: VI ⁇ V2).
  • the varying annular gap depths and projection dimensions can be realized in that the standard glow plug is pressed correspondingly deep into the press fit of the housing 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Spark Plugs (AREA)

Abstract

A pencil type glow plug (10) to be arranged in the combustion chamber of air-compressing internal combustion engines has a tubular plug housing (11) in the longitudinal bore of which a pencil type glow element (16) is sealingly fixed over part of its length. An annular gap (21) is formed in a particular area located at the bottom of or facing the combustion chamber between the longitudinal bore (12) and the glow element (16) for thermally uncoupling the plug housing from the glow element.

Description

GlühstiftkerzeGlow plug
Stand der TechnikState of the art
Die Erfindung geht aus von einer Glühstiftkerze zurThe invention relates to a glow plug
Anordnung im Brennraum luftverdichtender Brennkraftmaschinen nach der Gattung des Hauptanspruchs . Bei bekannten Glühstiftkerzen dieser Art wird der Ringspalt zwischen Glühstift und Kerzengehäuse durch einen Glühstift mit konstantem Durchmesser im Preßsitzbereich und einer demArrangement in the combustion chamber of air-compressing internal combustion engines according to the type of the main claim. In known glow plugs of this type, the annular gap between the glow plug and the plug housing is replaced by a glow plug with a constant diameter in the press-fit area and one
Brennraum zugewandten zylindrischen Bohrung im Kerzengehäuse realisiert. Diese Bohrung ist durch einen Durchmesser, der größer als der Preßsitzdurchmesser des Glühstiftes ist, gekennzeichnet .Combustion chamber facing cylindrical bore realized in the candle housing. This bore is characterized by a diameter that is larger than the interference fit diameter of the glow plug.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Glühstiftkerze mit den kennzeichnenden Merkmalen des Hauptanspruchs hat die Aufgabe, den Glühstift auf der entsprechenden Ringspalttiefe weitgehend thermisch zu entkoppeln und somit die gewünschte Aufheizcharakteristik zu gewährleisten. In Abhängigkeit des sogenannten Vorstehmaßes, d.h. der freien Länge des Glühstiftes von der Unterkante des Kerzengehäuses bis zur Heizkörperspitze, ist für einen Standardstift gleichbleibender Geometrie und Aufheizcharakteristik, die Tiefe des Ringspaltes dem Vorstehmaß anzupassen. Dies hat eine hohe Teilevielfalt der Kerzengehäuse zur Folge, die lediglich durch die Tiefe des Ringspaltes variieren. Der wesentliche Vorteil besteht darin, daß der Ringspalt, im Gegensatz zum Stand der Technik, durch einen im Bereich des Preßsitzes entsprechend abgesetzten Glühstift mit aufgeweitetem Durchmesser und einem Kerzengehäuse ohne Durchmesserabstufung realisiert wird. Dadurch kann dieThe glow plug according to the invention with the characterizing features of the main claim has the task of largely thermally decoupling the glow plug at the corresponding annular gap depth and thus ensuring the desired heating characteristic. Depending on the so-called projection dimension, ie the free length of the glow plug from the lower edge of the candle housing to the radiator tip, the depth of the annular gap must be adapted to the projection dimension for a standard pencil with the same geometry and heating characteristics. This results in a large variety of parts of the candle housing, which only vary due to the depth of the annular gap. The main advantage is that, in contrast to the prior art, the annular gap is realized by a glow plug, correspondingly offset in the area of the press fit, with a widened diameter and a candle housing without a graduated diameter. This allows the
Anzahl der Kerzengehäuse, die in ihrer Geometrie lediglich durch die Tiefe des Ringspaltes variieren, auf ein für dieses Merkmal universell einsetzbares Gehäuse reduziert werden. Gleichzeitig kann nach wie vor ein Standardstift gleichbleibender Geometrie verwendet werden, der zurNumber of candle housings, which vary in their geometry only by the depth of the annular gap, can be reduced to a housing that can be used universally for this feature. At the same time, a standard pin of constant geometry can still be used
Erzeugung der gewünschten Ringspalttiefe entsprechend tief in das Kerzengehäuse eingepreßt wird.Generation of the desired annular gap depth is pressed accordingly deep into the candle housing.
Die Realisierung des Ringspaltes durch einen im Bereich des Pressitzes abgesetzten Glühstift bedingt die Vergrößerung des Preßsitzdurchmessers des Glühstiftes gegenüber dem Preßsitzdurchmesser des derzeitigen Standes der Technik. Diese Durchmesseraufweitung führt zu einer Vergrößerung des zur Verfügung stehenden Bauraums für die Dichtung des Glühstiftes. Die Durchmesseraufweitung reduziert in diesem Bereich den erforderlichen Umformgrad des Glührohrs sowie der eingepreßten Dichtung. Dadurch wird die Gefahr der Rißbildung der Dichtung beim formgebenden Hämmerverfahren des Glühstiftes signifikant reduziert.The realization of the annular gap by means of a glow plug which is offset in the region of the press fit causes the press fit diameter of the glow plug to be enlarged compared to the press fit diameter of the current state of the art. This widening of the diameter leads to an increase in the space available for sealing the glow plug. The widening of the diameter in this area reduces the required degree of deformation of the glow tube and the pressed-in seal. This significantly reduces the risk of the seal cracking during the shaping hammering process of the glow plug.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung wiedergegeben. Diese zeigt in:An embodiment of the invention is shown in the drawing. This shows in:
Figur 1 eine Glühstiftkerze, teilweise im Längsschnitt, in den Figuren 2 und 3 in vergrößertem Maßstab die mit X bezeichnete Ringspaltzone.1 shows a glow plug, partly in longitudinal section, in FIGS. 2 and 3 on an enlarged scale the annular gap zone designated by X.
Beschreibung des Ausführungsbeispiels Die Glühstiftkerze 10 besteht aus einem langgestreckten, zylindrischen Gehäuse 11 mit einer mittigen Bohrung 12, die zum oberen Ende hin eine konische Erweiterung 13 hat. Etwas unterhalb dieser Erweiterung ist an der Bohrung 12 ein ringförmiger Absatz 15 gebildet, und zwar dadurch, daß der Durchmesser der Bohrung 12 oberhalb dieses Absatzes 15 etwas kleiner ist als der Durchmesser im nachfolgenden Bereich 12 A der Bohrung 12. Im Gehäuse 10 befindet sich der Glühstift 16, der mit seiner Spitze 17 in den Brennraum der Kraftmaschine eintaucht. Die Fügeverbindung zwischen Glühstift und Kerzengehäuse ist bisher als Pressitz 12 A mit konstanten brennraumseitigen Bohrungsdurchmesser ausgeführt. Das Vorstehmaß V des Glühstiftes 16 der Glühstif kerze ist definiert als der Abstand zwischen der Heizkörperspitze und dem Prüfdurchmesser am Dichtkonus des Kerzengehäuses .Description of the embodiment The glow plug 10 consists of an elongated, cylindrical housing 11 with a central bore 12, which has a conical extension 13 towards the upper end. Somewhat below this extension, an annular shoulder 15 is formed on the bore 12, namely in that the diameter of the bore 12 above this paragraph 15 is slightly smaller than the diameter in the subsequent region 12 A of the bore 12. In the housing 10 is the Glow plug 16 which dips with its tip 17 into the combustion chamber of the engine. The joint between glow plug and candle housing has so far been designed as a press fit 12 A with a constant bore diameter on the combustion chamber side. The projection dimension V of the glow plug 16 of the glow plug candle is defined as the distance between the radiator tip and the test diameter on the sealing cone of the candle housing.
Auf die Konstruktion des Glühstifts ist weiter nicht eingegangen, da nicht erfindungswesentlich. Er kann in die Bohrung 12 zweckmäßigerweise eingepresst sein. Eine imThe construction of the glow plug has not been discussed further, since it is not essential to the invention. It can expediently be pressed into the bore 12. One in
Glührohr des Glühstifts angeordnete Glühwendel ist weiter nicht dargestellt. Der aus dem Kerzengehäuse 11 hinausragende Anschlußbolzen 18, dient der Stromzuführung zur Stromwendel. Der Anschlußbolzen 18 ist mittels einer radial verpreßten Dichtung 20 im oberen, nicht weiter dargestellten rohrförmigen Bereich des Glühstiftes 16, fixiert. Die Dichtung 20 dichtet den Glühstift 16 zwischen Glührohr und Anschlußbolzen 18 gegen die Umgebung ab. Der ringförmige Absatz 15 am Gehäuse 11 hat den Zweck, daß der Glühstift 16 samt Anschlußbolzen 18 bei zu hohem Druck imGlow tube of the glow plug arranged filament is also not shown. The connecting bolt 18 protruding from the candle housing 11 serves to supply current to the current coil. The connecting pin 18 is fixed by means of a radially pressed seal 20 in the upper, tubular region of the glow plug 16, which is not further shown. The seal 20 seals the glow plug 16 between the glow tube and the connecting pin 18 from the environment. The annular shoulder 15 on the housing 11 has the purpose that the glow plug 16 together with the connecting pin 18 at too high pressure in
Brennraum nicht nach oben aus dem Gehäuse 11 hinausgedrückt werden kann. Am oberen Rand des Glühstifts 16 befindet sich eine Dichtung 20, die den Heizkörper zwischen Glührohr und Anschlußbolzen gegen die Umgebung abdichtet. WO 99/28679 _- 4 , _- PCT/DE98/03503Combustion chamber cannot be pushed up out of the housing 11. At the upper edge of the glow plug 16 there is a seal 20 which seals the radiator between the glow tube and the connecting bolt against the environment. WO 99/28679 _- 4, _- PCT / DE98 / 03503
Die Figuren 2 und 3 zeigen den erfindungsrelevanten Bereich des Ringspalts 21 bzw. der Ringspaltzone zwischen Kerzengehäuse und Glühstift. Diese Zone wird zwischen dem brennraumseitigen, konstanten Preßsitzdurchmesser des Kerzengehäuses und einem innerhalb des Kerzengehäuses im Außendurchmesser abgesetzten Glühstift realisiert. Dabei weist der brennraumseitige Bereich des Glühstifts unterhalb eines Absatzes 16 B einen kleineren Durchmesser 16 C auf als der des Preßsitzbereichs 12 A.FIGS. 2 and 3 show the area of the annular gap 21 or the annular gap zone between the candle housing and glow plug which is relevant to the invention. This zone is realized between the constant interference fit diameter of the candle housing on the combustion chamber side and a glow plug which is offset in the outer diameter within the candle housing. The area of the glow plug on the combustion chamber side below a shoulder 16 B has a smaller diameter 16 C than that of the press fit area 12 A.
Insbesondere die Figur 2 zeigt die Anordnung des erfindungsgemäßen Glühstiftes im Kerzengehäuse zur Erzeugung einer Ringspalttiefe Rl . Die Figur 3 zeigt die Anordnung des erfindungsgemäßen Glühstifts im Kerzengehäuse zur Erzeugung einer Ringspalttiefe R2. Die Glühstifte nach Figur 2 und 3 können dieselbe Geometrie und Aufheizcharakteristik aufweisen, d.h. es kann ein Standard-Glühstift zur Realisierung unterschiedlicher Ringspalttiefen (hier: Rl > R2) und damit auch unterschiedlicher Vorstehmaße (hier: VI < V2) verwendet werden. Die variierenden Ringspalttiefen und Vorstehmaße können dadurch realisiert werden, daß der Standard-Glühstift entsprechend tief in den Preßsitz des Gehäuses 11 eingepreßt wird. In particular, Figure 2 shows the arrangement of the glow plug according to the invention in the candle housing to produce an annular gap depth R1. FIG. 3 shows the arrangement of the glow plug according to the invention in the candle housing to produce an annular gap depth R2. The glow plugs according to Figures 2 and 3 can have the same geometry and heating characteristics, i.e. A standard glow plug can be used to implement different annular gap depths (here: Rl> R2) and thus different projection dimensions (here: VI <V2). The varying annular gap depths and projection dimensions can be realized in that the standard glow plug is pressed correspondingly deep into the press fit of the housing 11.

Claims

Ansprüche Expectations
1. Glühstiftkerze (10) zur Anordnung im Brennraum luftverdichtender Brennkraftmaschinen mit einem rohrförmigen, metallischen Kerzengehäuse (11) , in dessen Längsbohrung (12) ein Glühstift (16) mit einem Teil seiner Länge abdichtend fixiert ist, sowie mit einem zur Stromzuführung dienenden, teilweise im Glühstift angeordneten Anschlußbolzen (18) , und wobei sich zwischen Glühstift (16) und Kerzengehäuse (11) mindestens teilweise ein Ringspalt (21) befindet, der vom brennraumseitigen Ende des Kerzengehäuses ausgeht, dadurch gekennzeichnet, daß der Ringspalt (21) durch eine im Durchmesser verringerte Zone (16A) am Glühstift (16 C) gebildet ist.1. glow plug (10) for arrangement in the combustion chamber of air-compressing internal combustion engines with a tubular, metallic candle housing (11), in the longitudinal bore (12) of which a glow plug (16) is fixed sealingly with part of its length, and with a part serving for power supply arranged in the glow plug connection pin (18), and wherein between the glow plug (16) and the candle housing (11) there is at least partially an annular gap (21) which starts from the combustion chamber end of the candle housing, characterized in that the annular gap (21) by an in Reduced diameter zone (16A) is formed on the glow plug (16 C).
2. Glühstiftkerze nach Anspruch 1, dadurch gekennzeichnet, daß unterschiedliche Ringspalttiefen (Rl, R2) und Vorstehmaße (V) mit einem einzigen Standard-Glühstift gleicher Geometrie und Aufheizcharakteristik durch variierende Einpresstiefe des Glühstiftes in den Preßsitz des Kerzengehäuses realisiert werden können.2. glow plug according to claim 1, characterized in that different annular gap depths (Rl, R2) and Vorstehm dimensions (V) can be realized with a single standard glow plug of the same geometry and heating characteristics by varying the depth of engagement of the glow plug in the press fit of the candle housing.
3. Glühstiftkerze nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zur Verwirklichung unterschiedlicher Ringspalttiefen (Rl, R2) ein einziges Standard-Kerzengehäuse verwendet werden kann, dessen Pressitz und Ringspalt in3. glow plug according to claim 1 or 2, characterized in that a single standard candle housing can be used to achieve different annular gap depths (Rl, R2), the press fit and annular gap in
Richtung Brennraum einen konstanten Durchmesser oder eine beliebige Durchmesserabstufung konstanter Geometrie aufweist . WO 99/28679 _ 6 _ PCT/DE98/03S03Towards the combustion chamber has a constant diameter or any diameter gradation of constant geometry. WO 99/28679 _ 6 _ PCT / DE98 / 03S03
4. Glühstiftkerze nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Durchmesseränderung an der Ringkante4. glow plug according to one of claims 1 to 3, characterized in that the change in diameter at the ring edge
(16 B) des Glühstiftes (16) eine beliebige geometrische Gestalt aufweist und der Glühstift derart in das Kerzengehäuse eingepreßt ist, daß die Durchmesserabstufung innerhalb des Kerzengehäuses erfolgt .(16 B) of the glow plug (16) has any geometric shape and the glow plug is pressed into the candle housing in such a way that the diameter gradation takes place within the candle housing.
5. Glühstiftkerze nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Bereich der Durchmesseraufweitung des Glühstiftes (16) innerhalb des Kerzengehäuses einen geringeren Umformgrad des Glührohrs erfordert .5. Glow plug according to one of claims 1 to 4, characterized in that the area of the diameter expansion of the glow plug (16) within the plug housing requires a lower degree of deformation of the glow tube.
6. Glühstiftkerze nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Durchmesserabstufung am Glühstift insbesondere durch Hämmern, Walzen, Ziehen oder Kaltfließpressen erfolgt.6. Glow plug according to one of claims 1 to 5, characterized in that the diameter gradation on the glow plug is carried out in particular by hammering, rolling, drawing or cold extrusion.
7. Glühstiftkerze nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß im Inneren des Kerzengehäuses eine Ringkante (15) gebildet ist, die geringfügig kleiner ist, als der Außendurchmesser des Glühstiftstiftes (16) in diesem Bereich. 7. glow plug according to one of claims 1 to 6, characterized in that an annular edge (15) is formed in the interior of the candle housing, which is slightly smaller than the outer diameter of the glow plug (16) in this area.
EP98962285A 1997-11-28 1998-11-30 Pencil type glow plug Expired - Lifetime EP1034399B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19752920 1997-11-28
DE19752920A DE19752920A1 (en) 1997-11-28 1997-11-28 Glow plug
PCT/DE1998/003503 WO1999028679A1 (en) 1997-11-28 1998-11-30 Pencil type glow plug

Publications (2)

Publication Number Publication Date
EP1034399A1 true EP1034399A1 (en) 2000-09-13
EP1034399B1 EP1034399B1 (en) 2002-04-10

Family

ID=7850183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98962285A Expired - Lifetime EP1034399B1 (en) 1997-11-28 1998-11-30 Pencil type glow plug

Country Status (5)

Country Link
EP (1) EP1034399B1 (en)
JP (1) JP4188559B2 (en)
DE (2) DE19752920A1 (en)
ES (1) ES2175833T3 (en)
WO (1) WO1999028679A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10041282B4 (en) * 2000-08-22 2005-02-10 Beru Ag Method for connecting a heating rod of a glow plug with its glow plug body and a corresponding glow plug

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8500986U1 (en) * 1985-01-16 1985-04-25 BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg Glow plug
JP2847565B2 (en) * 1990-04-27 1999-01-20 日本特殊陶業株式会社 Sheath type glow plug and method of manufacturing the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9928679A1 *

Also Published As

Publication number Publication date
DE59803784D1 (en) 2002-05-16
DE19752920A1 (en) 1999-06-02
WO1999028679A1 (en) 1999-06-10
ES2175833T3 (en) 2002-11-16
JP4188559B2 (en) 2008-11-26
JP2001525529A (en) 2001-12-11
EP1034399B1 (en) 2002-04-10

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