EP2255130B1 - Glührohr für eine glühstiftkerze und verfahren zu dessen herstellung - Google Patents

Glührohr für eine glühstiftkerze und verfahren zu dessen herstellung Download PDF

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Publication number
EP2255130B1
EP2255130B1 EP09713582.6A EP09713582A EP2255130B1 EP 2255130 B1 EP2255130 B1 EP 2255130B1 EP 09713582 A EP09713582 A EP 09713582A EP 2255130 B1 EP2255130 B1 EP 2255130B1
Authority
EP
European Patent Office
Prior art keywords
glow tube
glow
seamless
tube
sheathed
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.)
Not-in-force
Application number
EP09713582.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2255130A1 (de
Inventor
Albrecht Geissinger
Simon Schmittinger
Karl-Heinz Heussner
Pavlo Saltikov
Armin Kussmaul
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 EP2255130A1 publication Critical patent/EP2255130A1/de
Application granted granted Critical
Publication of EP2255130B1 publication Critical patent/EP2255130B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F23Q2007/004—Manufacturing or assembling methods

Definitions

  • the invention relates to a method for producing a seamless glow tube according to the preamble of the independent claims.
  • a glow plug with a glow plug which is encased in a thin-walled glow tube, is for example out DE 94 12 268 U1 known.
  • the thin-walled glow tube is closed at its combustion chamber end.
  • resistance heating element is embedded as a heater.
  • the resistance heating element is composed of a heating coil and a control coil.
  • the resistance heating element is provided brennraumfern with a connection part for an electrical circuit. When closing the circuit, the heater is heated and the glow tube of the glow plug is heated at each annealing to an operating temperature of about 1100 ° C.
  • the material of the glow tube is therefore exposed to a very high thermal stress.
  • Ni-base alloys are used, which are known for example under the DIN designations 2.4851 or 2.4633.
  • glow tubes usually longitudinally welded glow tube body are used.
  • the starting material for this Glührohr notion is a metal strip, which is bent into a tube and the joints are welded without additional.
  • the glow tube bodies are then annealed to eliminate the welding stresses. Thereafter, the tubes are pulled over a mandrel, wherein the degree of deformation is 10 to 50%. Subsequently, recrystallization annealing is performed to adjust the mechanical properties and microstructure.
  • thermomechanical loads The strains caused by the thermo-mechanical stress are concentrated on the mechanically weakest region, namely the heat-affected zone of the weld, due to the different structures of the weld seam, the sheet material of the glow tube and the heat-affected zone of the weld.
  • Object of the present invention is to avoid cracking on the glow tube due to thermal stress.
  • the object of the invention is achieved with the characterizing measures of claim 1, claim 3 and dependent claim 2.
  • the seamless glow tube has no structure gradient along the circumference, so that thermomechanical loads are distributed substantially uniformly over the entire circumference of the glow tube and thus do not adversely affect the durability of the glow tube.
  • the seamless glow tube is produced by the production of a likewise seamless glow tube body, wherein the glow tube body is a precursor of the glow tube.
  • the glow tube body has a tubular long end portion with an outer diameter D and an inner diameter d, a truncated short end portion with a Reduzier devismesser Dj and an opening diameter dö and an intermediate reducing section.
  • the reduction section is formed by uniform tapering of the outer diameter D to the reduction diameter Dj and the inner diameter d to the opening diameter dö.
  • the seamless glow tube for the glow plug is conveniently prepared by means of a powder metallurgy process.
  • a powder metallurgy process is an extrusion of a compound of metal powder with a subsequent expulsion of the binder and sintering of a preform thus produced is suitable.
  • Another powder metallurgical process is metal powder injection molding.
  • the illustrated glow plug has a tubular housing 11 with a longitudinal bore 12 into which a glow plug 13 is sealingly fixed with a portion of its length.
  • the glow plug 13 has a thin-walled glow tube 14 with, for example, an inner diameter of 2 to 5 mm and a wall thickness of 0.5 to 0.7 mm, which is closed at its combustion chamber end 15.
  • a resistance heating element 17 as a heater, which is embedded in a ceramic insulating material 18, which is for example magnesium oxide powder.
  • the resistance heating element 17 is contacted with the combustion chamber remote with a connection part 19 for connecting an electrical circuit.
  • the combustion chamber-side end of the resistance heating element 17 is electrically conductively connected to the bottom of the glow tube 14.
  • the resistance heating element 17 consists of two resistance coils connected in series, wherein the combustion space side resistance coil forms a heating coil 20 and the resistance coil remote from the combustion space forms a control coil 21.
  • the control coil 21 has the task to limit the current in the circuit due to its high positive temperature coefficient with increasing temperature.
  • the glow tube 14 is seamless. Due to the lack of weld, the glow tube 14 has no structure gradient along the circumference.
  • the ratio L / d of the length L and the inner diameter d is advantageously between 9 and 5.5.
  • the ratio of the length L to the cross-sectional area of the tube wall of the glow tube body 30 L / (D 2 -d 2 ) ⁇ / 4 is between 4.5 and 2 in 1 / mm.
  • the reducing section 33 has an S-shaped profile with a spherical-cap-shaped cross section 34, wherein the spherical cap of the cross section 34 has an outer radius R and an inner radius r.
  • the inner radius r is, for example, 0.5d.
  • the reducing section 33 has a conical cross section 35 with a cone angle ⁇ , wherein the cone angle ⁇ is between 60 and 80 degrees.
  • an extrusion of a compound of a metal powder is suitable.
  • the metal powder consists for example of a Ni-base alloy with the chemical composition 24- 26% Cr, 8 - 11% Fe, 1.8 - 2.4% Al, 0.15 - 0.25% C and balance Ni.
  • a seamless preform green body is produced by extrusion, whereby a cylindrical tube is produced by extrusion.
  • the cone or dome is applied either to the cylindrical green body or to the final sintered component by forming.
  • the binder contained in the preform is expelled.
  • the preform body thus produced sintered at a suitable sintering temperature to the finished powder metallurgical glow tube body 30.
  • Another powder metallurgical manufacturing method is to produce a seamless glow tube body 30 by metal powder injection molding.
  • metal powder injection molding a component is produced which has the contour of the glow tube body 30.
  • the length and diameter must be greater because the body shrinks approximately 15% linearly during sintering.
  • the indicated manufacturing methods for producing the seamless glow tube body 30 are known as such.
  • the heating coil of the resistance heating element 17 is inserted in the seamlessly produced glow tube body 30 and welded to the glow tube body 30 at the opening 37. Subsequently, the insulating material 18 is filled and the Glührohrelasticity 30 with the used resistance heating element 17 and the filled insulation material 18 is by forming, for. B. brought by pulling, swaging, pressing or stamping in the final shape of the seamless glow tube 14.
EP09713582.6A 2008-02-21 2009-02-12 Glührohr für eine glühstiftkerze und verfahren zu dessen herstellung Not-in-force EP2255130B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008010243 2008-02-21
DE102009000751A DE102009000751A1 (de) 2008-02-21 2009-02-10 Glührohr für eine Glühstiftkerze und Verfahren zu dessen Herstellung
PCT/EP2009/051604 WO2009103649A1 (de) 2008-02-21 2009-02-12 Glührohr für eine glühstiftkerze und verfahren zu dessen herstellung

Publications (2)

Publication Number Publication Date
EP2255130A1 EP2255130A1 (de) 2010-12-01
EP2255130B1 true EP2255130B1 (de) 2016-10-19

Family

ID=40896878

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09713582.6A Not-in-force EP2255130B1 (de) 2008-02-21 2009-02-12 Glührohr für eine glühstiftkerze und verfahren zu dessen herstellung

Country Status (5)

Country Link
EP (1) EP2255130B1 (ja)
JP (1) JP5249356B2 (ja)
CN (1) CN101946129B (ja)
DE (1) DE102009000751A1 (ja)
WO (1) WO2009103649A1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5437956B2 (ja) * 2010-09-06 2014-03-12 日本特殊陶業株式会社 グロープラグ及びその製造方法
DE102011077893A1 (de) 2011-06-21 2012-12-27 Robert Bosch Gmbh Verwendung einer heißgaskorrosionsbeständigen duktilen Legierung
JP6181962B2 (ja) * 2013-04-16 2017-08-16 日本特殊陶業株式会社 燃焼圧センサ付きグロープラグの製造方法
DE102013212283A1 (de) * 2013-06-26 2014-12-31 Robert Bosch Gmbh Glührohr für eine regelbare Glühstiftkerze
JP6218461B2 (ja) * 2013-07-03 2017-10-25 日本特殊陶業株式会社 グロープラグの製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1081720B (de) 1959-06-18 1960-05-12 Continental Elektro Ind Ag Elektrischer Rohrheizkoerper fuer Gluehkerzen von Brennkraftmaschinen
DE2935424A1 (de) 1979-09-01 1981-03-19 Robert Bosch Gmbh, 7000 Stuttgart Gluehstiftkerze fuer brennkraftmaschinen
JP2852552B2 (ja) * 1990-04-16 1999-02-03 自動車機器株式会社 シーズヒータおよびその製造方法
US5251589A (en) * 1992-03-16 1993-10-12 Wellman Automotive Products, Inc. Hot tip glow plug and method for making
JPH06109248A (ja) * 1992-09-28 1994-04-19 Jidosha Kiki Co Ltd シース型グロープラグの製造方法
DE9412268U1 (de) 1994-07-11 1994-09-22 Bosch Gmbh Robert Glühstiftkerze für Brennkraftmaschinen
JP3737880B2 (ja) * 1998-04-15 2006-01-25 日本特殊陶業株式会社 グロープラグ
JP2000033447A (ja) * 1998-07-16 2000-02-02 Honda Motor Co Ltd 鼓型円筒体の成形方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN101946129B (zh) 2012-07-04
WO2009103649A1 (de) 2009-08-27
DE102009000751A1 (de) 2009-08-27
EP2255130A1 (de) 2010-12-01
CN101946129A (zh) 2011-01-12
JP5249356B2 (ja) 2013-07-31
JP2011525604A (ja) 2011-09-22

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