EP0887592A1 - Monolithische Sonde/Rohr für Glühkerze - Google Patents

Monolithische Sonde/Rohr für Glühkerze Download PDF

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Publication number
EP0887592A1
EP0887592A1 EP97830307A EP97830307A EP0887592A1 EP 0887592 A1 EP0887592 A1 EP 0887592A1 EP 97830307 A EP97830307 A EP 97830307A EP 97830307 A EP97830307 A EP 97830307A EP 0887592 A1 EP0887592 A1 EP 0887592A1
Authority
EP
European Patent Office
Prior art keywords
main body
plug
tubular element
projecting
sheathing element
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
EP97830307A
Other languages
English (en)
French (fr)
Other versions
EP0887592B1 (de
Inventor
Roberto Rossi
Claudio Tonelli
Gianpaolo Lugli
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.)
Federal Mogul Italy SRL
Original Assignee
Cooper Industries Italia SpA
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 Cooper Industries Italia SpA filed Critical Cooper Industries Italia SpA
Priority to EP97830307A priority Critical patent/EP0887592B1/de
Priority to DE69706149T priority patent/DE69706149T2/de
Priority to AT97830307T priority patent/ATE204372T1/de
Publication of EP0887592A1 publication Critical patent/EP0887592A1/de
Application granted granted Critical
Publication of EP0887592B1 publication Critical patent/EP0887592B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to an incandescent glow plug for preheating Diesel engines, as well as a method for the production of such plugs.
  • Incandescent glow plugs of known type are characterized by a main body of elongated shape with a threaded portion to permit it to be connected into the cylinder head. From one end of the main body there projects a sheathing element made of metallic material having outstanding resistance to high temperatures and to corrosion by the gases that develop in the combustion chamber.
  • the sheathing element contains a heating resistor that receives its electricity supply via a terminal projecting from the other end of the main body.
  • the sheathing element is an element separate from the main body and is fixed to the latter by means of implanting or welding.
  • a second problem associated with incandescent glow plugs of the traditional type is that of assuring a perfect seal for the combustion gases in the sealing zone between the sheathing element and the main body.
  • the present invention has as its object an incandescent glow plug and a method for its fabrication having the characteristics set out in Claims 1 and 3 hereinbelow.
  • the innovative aspect underlying the present invention consists essentially of the fact that both the sheathing element and the main body of the plug are obtained in integral form by starting from a single monolithic workpiece.
  • the monolithic structure of the plug completely eliminates every kind of sealing problem in the zone of passage from the main body to the sheathing element.
  • 10 indicates a tubular element of which the precise geometry (length, diameter, wall thickness) is determined as a function of the final dimensions of the plug it is proposed to produce.
  • the diameter d of the tubular element 10 could be of the order of 8-14 mm, with a wall thickness t of the order of 0.5-3 mm.
  • the material from which the tubular element 10 is made is an alloy having a particularly high resistance to both high temperatures and the corrosion effects of the gases that develop in the combustion chamber of a Diesel engine.
  • Materials having suitable characteristics include, for example, alloys of iron, nickel and chromium with a high chromium content (of the order of 20-24%, for example) and of a type similar to the alloys known by the commercial names of nicrofer 6023 or niccrofer 6025.
  • the tubular element 10 is subjected to a hammering operation during the course of which there are obtained on the tubular element 10 two portions 12, 14 having diameters of, respectively, d and d' that are separated from each other by means of an intervening truncated conical surface 16.
  • the hammering operation is performed by subjecting the end portion 12 to inward-acting radial forces that are applied by means of a series of rotating hammers and produce a plastic deformation of the portion 12 while yet maintaining the condition of coaxiality of the portions 12 and 14 with a high degree of accuracy.
  • the hammering operation represents a preferred form of realization of the present invention, the protection range of the invention does not exclude other methods of obtaining the same result, including die forming operations and straightforward material removal by machining.
  • the free end of the portion 12 is given an ogival shape by means of plastic deformation methods that are known per se.
  • a spiral resistor 18, to which there has previously been attached a terminal 20 is inserted in the portion 12 and is welded to the end 22 shaped in the manner of an ogive.
  • the terminal 20 projects beyond the far end of the portion 14, i.e. the free end away from the smaller-diameter portion 12.
  • the spiral resistor 18 may consist either of a single material (monospiral) or of two or more spirals of different materials connected to each other in series.
  • the portion 12 is subjected to a second operation of plastic deformation in the course of which its diameter is further reduced to a value d'' and the ogive-shaped end 22 is completely closed. At this point, therefore, the portion 12 of the tubular element 10 assumes the conformation of a closed tubular element that acts as a sheath enclosing the heating resistor 18 .
  • the subsequent operations have the purpose of impressing upon the larger-diameter portion 14 the shape of the main body of a plug.
  • This result is obtained by means of a plastic deformation operation that reduces the diameter of the portion 14, thus forming thereon two sections 26 and 28 having slightly different diameters.
  • the section 28 will have a diameter d III that, following a rolling operation, will make it possible to obtain a threaded length 30 having a diameter d IV suitable for being connected into a threaded seating provided on the cylinder head of an internal combustion engine (not shown).
  • the open end of the portion 28 is provided with a toroidal gasket and an insulating sleeve (neither of which is shown), after which the terminal part 32 of the portion 28 is shaped so as to confer upon it either a hexagonal or an octagonal profile.
  • the length of the terminal 20 that projects from the plug is provided with a connector 34 of such shape and size as may be desired, which is appropriately blocked in position.
  • the plug is completed and presents a main body 14 with a threaded portion 30 , a sheathing element 12 containing a spiral resistor and a conical sealing surface 16 that joins the sheathing element 12 to the main body 14 .
  • This production method makes it possible to maintain the tolerances of the concentricity or coaxiality of the sheathing element 12 with respect to the conical sealing surface 16 and the mean diameter of the threaded length 30 within much smaller limits [than in the traditional methods]. Furthermore, by virtue of the fact that the main body 14 and the sheathing element 12 have been obtained from a monolithic body, the method ensures a seal that is enormously greater than in the case of the known solutions, where the tubular element 12 is a piece distinct and separate from the main body 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Electron Tubes For Measurement (AREA)
EP97830307A 1997-06-27 1997-06-27 Monolithische Sonde/Rohr für Glühkerze Expired - Lifetime EP0887592B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97830307A EP0887592B1 (de) 1997-06-27 1997-06-27 Monolithische Sonde/Rohr für Glühkerze
DE69706149T DE69706149T2 (de) 1997-06-27 1997-06-27 Monolithische Sonde/Rohr für Glühkerze
AT97830307T ATE204372T1 (de) 1997-06-27 1997-06-27 Monolithische sonde/rohr für glühkerze

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97830307A EP0887592B1 (de) 1997-06-27 1997-06-27 Monolithische Sonde/Rohr für Glühkerze

Publications (2)

Publication Number Publication Date
EP0887592A1 true EP0887592A1 (de) 1998-12-30
EP0887592B1 EP0887592B1 (de) 2001-08-16

Family

ID=8230676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97830307A Expired - Lifetime EP0887592B1 (de) 1997-06-27 1997-06-27 Monolithische Sonde/Rohr für Glühkerze

Country Status (3)

Country Link
EP (1) EP0887592B1 (de)
AT (1) ATE204372T1 (de)
DE (1) DE69706149T2 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0997687A1 (de) * 1998-10-23 2000-05-03 Beru AG Rohrförmige Heiz- oder Messvorrichtung
EP1283394A2 (de) * 2001-08-10 2003-02-12 Ngk Spark Plug Co., Ltd. Heizelement
WO2010003727A1 (de) * 2008-07-11 2010-01-14 Robert Bosch Gmbh Glührohr, insbesondere für eine glühstiftkerze
JP2012154535A (ja) * 2011-01-25 2012-08-16 Ngk Spark Plug Co Ltd グロープラグ
DE10023395B4 (de) * 1999-05-13 2015-05-13 Denso Corporation Keramische Heizeinrichtung und Montageaufbau

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6166018A (ja) * 1984-09-08 1986-04-04 Tsukiboshi Seisakusho:Kk デイゼルエンジン用グロ−プラグのハウジングの製造方法
JPH05264034A (ja) * 1992-03-17 1993-10-12 Jidosha Kiki Co Ltd シース型グロープラグの製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6166018A (ja) * 1984-09-08 1986-04-04 Tsukiboshi Seisakusho:Kk デイゼルエンジン用グロ−プラグのハウジングの製造方法
JPH05264034A (ja) * 1992-03-17 1993-10-12 Jidosha Kiki Co Ltd シース型グロープラグの製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 234 (M - 507) 14 August 1986 (1986-08-14) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 034 (M - 1544) 19 January 1994 (1994-01-19) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0997687A1 (de) * 1998-10-23 2000-05-03 Beru AG Rohrförmige Heiz- oder Messvorrichtung
DE19849120A1 (de) * 1998-10-23 2000-06-29 Beru Ag Glühkerze
DE19849120C2 (de) * 1998-10-23 2000-09-28 Beru Ag Glühkerze
US6314930B1 (en) 1998-10-23 2001-11-13 Beru Ag Tubular heating or measurement device
DE10023395B4 (de) * 1999-05-13 2015-05-13 Denso Corporation Keramische Heizeinrichtung und Montageaufbau
EP1283394A2 (de) * 2001-08-10 2003-02-12 Ngk Spark Plug Co., Ltd. Heizelement
EP1283394A3 (de) * 2001-08-10 2006-06-28 Ngk Spark Plug Co., Ltd. Heizelement
WO2010003727A1 (de) * 2008-07-11 2010-01-14 Robert Bosch Gmbh Glührohr, insbesondere für eine glühstiftkerze
JP2012154535A (ja) * 2011-01-25 2012-08-16 Ngk Spark Plug Co Ltd グロープラグ

Also Published As

Publication number Publication date
ATE204372T1 (de) 2001-09-15
DE69706149D1 (de) 2001-09-20
DE69706149T2 (de) 2002-01-03
EP0887592B1 (de) 2001-08-16

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