EP0909923A1 - Glühstiftkerze mit Büchseverlängerung - Google Patents
Glühstiftkerze mit Büchseverlängerung Download PDFInfo
- Publication number
- EP0909923A1 EP0909923A1 EP97830505A EP97830505A EP0909923A1 EP 0909923 A1 EP0909923 A1 EP 0909923A1 EP 97830505 A EP97830505 A EP 97830505A EP 97830505 A EP97830505 A EP 97830505A EP 0909923 A1 EP0909923 A1 EP 0909923A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plug
- tubular sheath
- sheath element
- main body
- bushing
- 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
Links
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000006399 behavior Effects 0.000 abstract description 6
- 239000000843 powder Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000016571 aggressive behavior Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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 present invention concerns a glow plug for preheating Diesel engines, consisting of a main body having a threaded portion for its connection to the cylinder head of an engine and a tubular sheath element projecting from a first end of the main body, said tubular sheath element being closed at one of its ends and containing a heating resistor that is connected to a terminal projecting from a second end of the main body.
- glow plugs One of the difficulties that have to be faced by the producers of glow plugs is that they have to handle a rather large assortment of plugs differing from each other by virtue of the geometric characteristics and thermal behaviours necessary to match the type of engine on which they are to be mounted.
- One of the principal geometric parameters characterizing a glow plug is the length of the portion of the tubular sheath element that projects from the main body.
- Glow plugs may also differ from each other on account of the presence or otherwise of an annular cavity surrounding a section of the tubular sheath element and situated at the end of the main body from which said tubular sheath element projects. All other characteristics being equal, such a cavity makes it possible to vary the thermal behaviour of the plug.
- the object of the present invention is to provide a glow plug of an improved type that will permit to overcome these difficulties.
- this object is attained by a plug having the characteristics set out in Claim 1.
- the assortment of glow plugs with different geometric and thermal characteristics is produced by starting from a single and standardized model of a complete plug on which there is fixed, coaxially with the tubular element, a bushing piece whose length in the direction of the plug axis can be varied according to the thermal and geometric characteristics it is desired to confer upon the glow plug.
- the bushing piece may either have an internal face directly in contact with the external surface of the tubular sheath element or, alternately, an internal cylindrical surface with a diameter greater than the external diameter of the tubular sheath element, thereby forming an annular chamber coaxial with a section of the sheath tubular element, for the purpose of varying the thermal characteristics of the plug.
- a glow plug for preheating Diesel engines is indicated 10.
- the plug 10 comprises a main metal body 12 with a threaded portion 14 that serves for fixing the plug 10 in a hole (not shown) in the cylinder head of a Diesel internal combustion engine.
- a portion of the head 16 of the main body 12 is shaped in such a way as to have a polygonal profile, a hexagon for example, so that it can be tightened by means of a spanner (not shown).
- the main body 12 has an elongated shape along the longitudinal axis 18 of the plug and has a through cavity 20 coaxial with the axis 18.
- the main body 12 has a first end 22 from which there projects a tubular sheath element 24 made of an inconel alloy capable of resisting the high temperatures and the chemical aggression of the combustion gases.
- the tubular sheath element 24 contains a spiral resistor 25 having a first end welded to the closed end 26 of the tubular sheath element 24 and a second end electrically connected to an elongated terminal 27.
- An insulating powder capable of resisting high temperatures (magnesium oxide, for example) fills the volume within the tubular sheath element 24 and thus ensures electrical insulation between the sheath and the resistor 25.
- the tubular sheath element 24, complete with resistor 25, terminal 27 and insulating powder is fixed inside the cavity 20 of the main body 12 in a manner that is known per se.
- An end portion 28 of the terminal 27 projects from the other end 30 of the main body 12.
- the terminal 27 is electrically insulated both from the tubular sheath element 24 and the main body 12 by means of the insulating bushes 32 and
- tubular sheath element 24 could also be obtained as an integral part of the main body 12 in the manner described in European patent application No. 97830307 by the same applicant.
- the glow plug in accordance with the present Invention is essentially characterized by the presence of an axial prolongation of the main body 12, consisting of an insulating bushing 32 constituting a component separate from and independent of the main body 12.
- the bushing 32 is fixed to the plug 10 by any appropriate means known to the state of the art, by welding for example, or by brazing, screwing, etc.
- the bushing piece 32 can be fixed to the end 22 of the main body 12, or to the external surface of the tubular sheath element 24 or to the external cylindrical surface of the main body 12 in the vicinity of its end 22, though in that case shape of the bushing has to be modified from the one shown in Figure 1.
- the bushing 32 has the purpose of varying the geometric characteristics and the thermal behaviour of the plug 10 in accordance with the specific needs of the engine in which the plug is intended to be mounted. More precisely, the plug 10 without the bushing 32 is a plug of standard type in which the length of the portion of the tubular sheath element projecting from the main body 12 is equal to L.
- the standard plug is of such size that the length L is the greatest of any plug forming part of a given production assortment.
- the standard plug can be adapted for use with engines that call for a smaller length of the projecting portion of the tubular sheath element 24 by applying the bushing 32.
- the plug of standard configuration indicated by 10a can be appropriately adapted for different uses by applying bushing pieces 32 of different axial lengths and thus obtaining corresponding reductions of the free length of the tubular sheath element 24.
- the bushing 32 has an internal surface 34 in contact with the external surface of the tubular sheath element 24.
- FIG. 3b and 3c illustrates how the application of a bushing piece 32, in addition to changing the geometric characteristics of the plug, can also modify its thermal behaviour as compared with that of the plugs 10b and 10c by providing, for example an annular chamber 36 between the internal surface of the bushing piece 32 and the external surface of the tubular sheath element 24.
- a further geometric parameter that can be varied by means of the bushing piece 32 according to the present invention is the shape and/or the size of a sealing chamfer 38 provided at the bottom end of the bushing 32 and intended to make tight contact with a similarly shaped surface of the plug seating.
- a standard plug 10a can be used to obtain different products 10b'' and 10c'' that are to all intents and purposes different elements of the production assortment.
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)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69702524T DE69702524T2 (de) | 1997-10-10 | 1997-10-10 | Glühstiftkerze mit Büchseverlängerung |
ES97830505T ES2150209T3 (es) | 1997-10-10 | 1997-10-10 | Bujia incandescente con extension de casquillo. |
EP97830505A EP0909923B1 (de) | 1997-10-10 | 1997-10-10 | Glühstiftkerze mit Büchseverlängerung |
SI9730077T SI0909923T1 (en) | 1997-10-10 | 1997-10-10 | Glow plug with bushing extension |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97830505A EP0909923B1 (de) | 1997-10-10 | 1997-10-10 | Glühstiftkerze mit Büchseverlängerung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0909923A1 true EP0909923A1 (de) | 1999-04-21 |
EP0909923B1 EP0909923B1 (de) | 2000-07-12 |
Family
ID=8230805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97830505A Expired - Lifetime EP0909923B1 (de) | 1997-10-10 | 1997-10-10 | Glühstiftkerze mit Büchseverlängerung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0909923B1 (de) |
DE (1) | DE69702524T2 (de) |
ES (1) | ES2150209T3 (de) |
SI (1) | SI0909923T1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19757725C5 (de) * | 1997-12-23 | 2004-02-26 | Beru Ag | Dieselstarthilfe |
WO2007033824A1 (de) * | 2005-09-22 | 2007-03-29 | Beru Aktiengesellschaft | Zusammengesetzter leiter, insbesondere für glühkerzen für dieselmotoren |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2016596A (en) * | 1978-03-05 | 1979-09-26 | Gen Motors France | Spark plugs |
DE19630208A1 (de) * | 1996-07-26 | 1998-01-29 | Bosch Gmbh Robert | Glühstiftkerze |
-
1997
- 1997-10-10 ES ES97830505T patent/ES2150209T3/es not_active Expired - Lifetime
- 1997-10-10 SI SI9730077T patent/SI0909923T1/xx unknown
- 1997-10-10 EP EP97830505A patent/EP0909923B1/de not_active Expired - Lifetime
- 1997-10-10 DE DE69702524T patent/DE69702524T2/de not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2016596A (en) * | 1978-03-05 | 1979-09-26 | Gen Motors France | Spark plugs |
DE19630208A1 (de) * | 1996-07-26 | 1998-01-29 | Bosch Gmbh Robert | Glühstiftkerze |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19757725C5 (de) * | 1997-12-23 | 2004-02-26 | Beru Ag | Dieselstarthilfe |
WO2007033824A1 (de) * | 2005-09-22 | 2007-03-29 | Beru Aktiengesellschaft | Zusammengesetzter leiter, insbesondere für glühkerzen für dieselmotoren |
Also Published As
Publication number | Publication date |
---|---|
DE69702524D1 (de) | 2000-08-17 |
SI0909923T1 (en) | 2000-12-31 |
ES2150209T3 (es) | 2000-11-16 |
DE69702524T2 (de) | 2001-03-08 |
EP0909923B1 (de) | 2000-07-12 |
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