EP1188023B1 - Elektrisch beheizbare glühkerze oder glühstab für verbrennungsmotoren - Google Patents
Elektrisch beheizbare glühkerze oder glühstab für verbrennungsmotoren Download PDFInfo
- Publication number
- EP1188023B1 EP1188023B1 EP00925294A EP00925294A EP1188023B1 EP 1188023 B1 EP1188023 B1 EP 1188023B1 EP 00925294 A EP00925294 A EP 00925294A EP 00925294 A EP00925294 A EP 00925294A EP 1188023 B1 EP1188023 B1 EP 1188023B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glow
- glow plug
- coil
- plug
- powder filling
- 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 an electrically heatable glow plug or a glow rod for internal combustion engines according to the preamble of claim 1, as for example from EP 450 185 B1 as known.
- No. 5,791,308 describes a glow plug in which a heating coil around a core of refractory material is wound. This core acts as a heat sink, thus absorbing the heat of the heating coil and increases their life.
- glow plugs are used in the combustion chamber for preheating during a cold start or - as a glow rod in the intake duct - used for intake air preheating.
- the glow plug or The glow rod consist of a corrosion-free metallic Sheath, a heating coil and a control coil and an electric insulating, compressed powder filling.
- the heating and Control coil consists of a ferritic heating system Steel to which a pure nickel wire is welded as a resistance is.
- the material of the heating coil is subject during operation a thermal and chemical influence affecting the life may affect the glow plug. At least put these influences are essential parameters regarding the lifetime the glow plug dar. Due to the high operating temperatures the heating coil and a still existing Oxygen supply in the compressed powder filling occurs to a gradual corrosion of the heating coil. And that is possible On the one hand, intercrystalline corrosion occurs by crystal growth and tendency to coarse grain formation ferritic heating conductors is promoted. On the other hand it can at high temperatures for corrosion on the free surface the heating coil and thus to weaken the Schudrahtqueriteses come.
- magnesium oxide is generally used. Around the atmospheric oxygen contained in the pores of the powder filling minimize the powder is very highly compressed, by placing the filled metal shell from the outside through a concentric acting impact tool compressed and thereby im Diameter is reduced.
- the powder filling is in the range the Schustabspitze particularly compacted by the there Metal shell is conically compressed.
- the object of the invention is based on the generic Glow plug for a longer life of the heating coil to improve.
- glow plugs in the combustion chamber for the Pre-heating during cold start or - as a rod-shaped flame glow plug or flame system in the supply air duct - for air preheating used.
- the embodiment shown in Figure 1 a glow plug has a glow tube 5, the in held a plug body 1 and electrically conductive with him connected is.
- the jacket of the glow tube is usually from a nickel-rich iron alloy or from a corrosion-free one Nickel-based alloy, such as Inconel 601 and is usually electrically connected as a ground, so negatively. This electrical ground connection comes over that Screw thread 7 and / or through the cone 7a at the bottom front end of the candle body 1 state.
- the glow tube In the glow tube is a heating coil 8 with a via a Connection welding 11 control coil 9 welded thereto and an electrically insulating, compacted powder filling 10 arranged.
- This powder filling has, in particular in condensed state, several functions: It provides first that the heating (8) and control coil 9 within, the glow tube stationary housed and fixed and are held electrically isolated.
- the compact Powder By the compact Powder must as possible the heat generated in the heating coil 8 well forwarded to the mantle of the glow tube.
- the compression of the powder Air pockets especially a certain residual oxygen be eliminated as possible. This requires a special make intensive compaction of the powder, especially in the Area of the heating coil 8.
- the heating and control coil 8, 9 is in the heating area (Heating coil 8) made of a ferritic steel, e.g. from one Iron-chromium-aluminum alloy with 17 to 22% chromium and 3 up to 7% aluminum; is a commonly used alloy Kantal AF CrA1225. At such a heating coil is a coiled Wire (control coil 9) welded from pure nickel (Joint weld 11), the function of a variable resistor has.
- the heating coil 8 is in the top of Glow tube via a sealing weld 12 with the glow tube connected.
- the other end of the control coil 9 is one in one Insulating washer 4 embedded connecting bolt 2 connected, the electrically isolated and sealed by a seal 6 is led out of the candle body 1.
- the connecting bolt is via a nut 3, which ensures a cable eye contacted with the connecting bolt, with the plus pole one Power source connected.
- the connection pin 2 am upper open end of the glow tube with a soft insulating Gasket 6 'sealed, the penetration of Atmospheric oxygen in the compressed powder filling reliable should prevent.
- magnesium oxide is generally used.
- the filled glow tube from the outside through a concentrically acting impact tool radially compressed and thereby reduced in diameter, being also a conical History is achievable.
- the powder filling is compressed very strongly, by the metal sheath compressed particularly strong radially becomes.
- a diffusion treatment such as nitriding recommended, which by nitride formation in the diffusion zone leads to an increase in hardness and as a result of the diffusion processes a gradual transition from the hardened Edge zone to the soft core results.
- This diffusion zone 13 of the coils 8, 9 expediently has a depth t from about 5 to 10 microns.
- the helices Due to the hardening of the helices only in a near-surface boundary layer 13, the helices nevertheless nevertheless remain plastically deformable as a whole. On the other hand, a pronounced graining of the wire surface during the radial compression of the powder filling by the surface hardening is avoided. The helices have a smooth surface 14 even after the powder filling has been compressed. As a result, mechanical pre-damage of the conductor wire can be avoided. The result is a longer life expectancy of the conductor and thus the entire glow plug.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Description
- Fig. 1
- einen Längsschnitt durch eine Glühkerze,
- Fig. 2
- eine vergrößerte Darstellung der Einzelheit II aus Figur 1 und
- Fig. 3
- einen Querschnitt durch eine herkömmliche Glühkerze im Bereich der Einzelheit II mit oberflächlichen Vorschädigungen der Wendel durch die mechanische Beanspruchung beim Verdichten der Pulverfüllung.
Die folge ist eine höhere Lebensdauererwartung des Leiters und somit der gesamten Glühkerze.
Claims (4)
- Elektrisch beheizbare Glühkerze oder Glühstab für Verbrennungsmotoren, mit einem endseitig geschlossenen, korrosionsbeständigen Glührohr, das eine Füllung aus einem elektrisch nichtleitenden, verdichteten Pulver aufnimmt, in die eine elektrisch leitende Wendel eingebettet ist,
dadurch gekennzeichnet, dass zumindest die Heizwendel (8) an ihrer Oberfläche gehärtet ist. - Glühkerze oder Glühstab nach Anspruch 1,
dadurch gekennzeichnet, dass die elektrisch leitende Wendel (8, 9) an ihrer Oberfläche gehärtet ist. - Glühkerze oder Glühstab nach Anspruch 1,
dadurch gekennzeichnet, daß
die elektrisch leitende Wendel (8, 9) zumindest auf einem Teil ihrer Längserstreckung an ihrer Oberfläche durch eine Diffusionsbehandlung, insbesondere durch Nitrieren, gehärtet ist. - Glühkerze oder Glühstab nach Anspruch 3,
dadurch gekennzeichnet, daß
die harte Diffusionszone (13) der elektrisch leitenden Wendel (8, 9) eine Tiefe (t) von etwa 5 bis 10 µm aufweist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19928037 | 1999-06-18 | ||
DE1999128037 DE19928037C1 (de) | 1999-06-18 | 1999-06-18 | Elektrisch beheizbare Glühkerze oder Glühstab für Verbrennungsmotoren |
PCT/EP2000/004521 WO2000079185A1 (de) | 1999-06-18 | 2000-05-19 | Elektrisch beheizbare glühkerze oder glühstab für verbrennungsmotoren |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1188023A1 EP1188023A1 (de) | 2002-03-20 |
EP1188023B1 true EP1188023B1 (de) | 2004-06-23 |
Family
ID=7911788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00925294A Expired - Lifetime EP1188023B1 (de) | 1999-06-18 | 2000-05-19 | Elektrisch beheizbare glühkerze oder glühstab für verbrennungsmotoren |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1188023B1 (de) |
JP (1) | JP3618092B2 (de) |
DE (1) | DE19928037C1 (de) |
WO (1) | WO2000079185A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
HUP0302081A3 (en) | 2001-10-23 | 2005-10-28 | Bosch Gmbh Robert | Electrically heatable glow plug and method for producing said electrically heatable glow plug |
JP4971837B2 (ja) * | 2006-04-03 | 2012-07-11 | 日本特殊陶業株式会社 | グロープラグ及びグロープラグの取付構造。 |
JP5276425B2 (ja) * | 2008-12-15 | 2013-08-28 | 日本特殊陶業株式会社 | シースヒータ及びグロープラグ |
US11317761B2 (en) * | 2013-05-02 | 2022-05-03 | Original Pellet Grill Company Llc | Double-sealed high-temperature resistant DC ignitor for use with wood pellet burner assemblies |
JP6392000B2 (ja) * | 2014-06-17 | 2018-09-19 | 日本特殊陶業株式会社 | グロープラグ |
DE102014220235A1 (de) * | 2014-10-07 | 2016-04-07 | Robert Bosch Gmbh | Heizkörper für eine elektrisch beheizbare Glühstiftkerze mit axial gepresstem Heizeinsatz, und zugehöriges Herstellungsverfahren |
CN111537344B (zh) * | 2020-05-11 | 2022-03-08 | 西南石油大学 | 刚性堵漏材料抗压强度测试方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2746595A1 (de) * | 1977-10-15 | 1979-04-26 | Bosch Gmbh Robert | Gluehstiftkerze fuer brennkraftmaschinen |
DE4007340C1 (de) * | 1990-03-08 | 1990-10-11 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
US5791308A (en) * | 1997-07-18 | 1998-08-11 | Precision Combustion, Inc. | Plug assembly |
-
1999
- 1999-06-18 DE DE1999128037 patent/DE19928037C1/de not_active Expired - Fee Related
-
2000
- 2000-05-19 EP EP00925294A patent/EP1188023B1/de not_active Expired - Lifetime
- 2000-05-19 JP JP2001505506A patent/JP3618092B2/ja not_active Expired - Fee Related
- 2000-05-19 WO PCT/EP2000/004521 patent/WO2000079185A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
JP2003502613A (ja) | 2003-01-21 |
DE19928037C1 (de) | 2000-05-25 |
JP3618092B2 (ja) | 2005-02-09 |
WO2000079185A1 (de) | 2000-12-28 |
EP1188023A1 (de) | 2002-03-20 |
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