EP2649374A1 - Glühkerze mit graphitdichtung und elektrischer isolierschicht - Google Patents
Glühkerze mit graphitdichtung und elektrischer isolierschichtInfo
- Publication number
- EP2649374A1 EP2649374A1 EP11775780.7A EP11775780A EP2649374A1 EP 2649374 A1 EP2649374 A1 EP 2649374A1 EP 11775780 A EP11775780 A EP 11775780A EP 2649374 A1 EP2649374 A1 EP 2649374A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glow tube
- glow
- pressed
- graphite
- connecting bolt
- 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
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 according to the preamble of claim 1 and a method for producing the glow plug.
- the glow plugs of the prior art have a glow plug inserted into a metallic housing, which is designed with an glow tube and an incandescent tube arranged in the glow tube.
- the incandescent filament is electrically contacted at one end in an opening of the glow tube with a connecting bolt and at the other end with the metallic glow tube.
- the opening of the glow tube is sealed between glow tube and connecting bolt to protect the filament by means of a radiator seal against ambient air. So that no short circuit occurs between the glow tube and connecting bolt, the radiator seal is performed by a sealing element made of an elastomer.
- the maximum temperature for the elastomeric sealing element is limited to 1000 hours for long-term use at 200 ° C.
- a metallic sealing ring as a sealing element between the glow tube and the connecting bolt.
- For electrical insulation of the metallic sealing ring of the connecting bolt is provided in the sealing area with an electrical insulating layer.
- the metallic sealing ring is used as a solder joint, welded joint or sintered metal powder.
- a glow plug by means of a sealing element made of graphite in a housing of
- Glow plug is known from WO 2006/027280 AI known.
- the glow plug according to the invention and the inventive method for producing the glow plug have the advantage that a safe and cost-effective radiator seal can be achieved, which withstands higher temperatures and manages without an additional cohesive connection.
- the seal is achieved in that the sealing element made of graphite in the form of a pre-pressed Grafitrings is pushed in the region of the sealing portion on an insulating layer formed on the connecting bolt and the glow tube is pressed in the sealing portion on the graphite ring.
- the pre-pressed graphite ring is much easier to reshape than a metallic sealing ring and also adapts better to the contiguous shapes of the glow tube and connecting bolt.
- the electrical insulating layer is at least in the region of
- the press connection between glow tube, sealing element and connecting bolt is achieved by the glow tube at least in the region of the sealing section has a diameter reduction, by means of which the sealing element is pressed as a graphite ring between the glow tube and connecting bolt.
- An expedient method is a reduction in diameter of the glow tube which is carried out after assembly of the pre-pressed graphics, whereby the glow tube is pressed onto the graphite ring by rotary swaging.
- Figure 2 shows an enlarged portion II of the glow plug in Figure 1 with a first embodiment of a radiator seal
- FIG 3 shows the enlarged portion II of the glow plug in Figure 1 with a second embodiment of a Schuetzldichtung.
- the glow plug shown in Figure 1 has a metallic housing 10 with a continuous longitudinal bore 12 in which a glow plug 14 is pressed as a radiator.
- the glow plug 14 consists of a metallic glow tube 16, in which an incandescent filament 18 is arranged, which is contacted at one end with the glow tube 16 and at the other end with a terminal bolt 17 electrically.
- the connecting bolt 17, which is led out of the housing 10 at the opposite end to the glow plug 14 with a connection 21, is surrounded within the housing 10 by an annular space 13, which in turn is sealed off from the surroundings.
- the glow tube 16 is closed at the pointing into a combustion chamber of an internal combustion engine end and has at the opposite end to the annular space 13 toward an opening 22.
- the connection bolt 17 is provided, for example, with an end bore 24 in which the incandescent filament 18 is inserted with a centering turn 25.
- Essential for the life of the filament 18 is that the material of the filament 18 is protected from an oxidizing and nitriding atmosphere.
- the interior of the glow tube 16 is closed at the opening 22 with a radiator seal 30.
- the radiator seal 30 is formed by a sealing element 31 made of graphite and at least one electrical insulation.
- the sealing element 31 made of graphite is electrically insulated in a sealing section 23 between the glow tube 16 and the connecting bolt 17 and pressed there, wherein the electrical insulation, the sealing element 31 made of graphite at least in the region of the sealing portion 23 against the
- the sealing element 31 made of graphite encloses with the inner surface of the connecting bolt 17. On the outer peripheral surface of the sealing element 31 made of graphite, the glow tube 16 is pressed. The electrical insulation is necessary because graphite electrical see is conductive and a short circuit between the glow tube 16 and connecting bolt
- the glow tube 16 at least in the region of the sealing portion 23 has a diameter reduction 26, by means of which the sealing element 31 is pressed from graphite between the glow tube 16 and the terminal bolt 17.
- the electrical insulation is formed by an electrical insulating layer 32 applied to the connecting bolt 17.
- the sealing element 31 made of graphite is pressed between the insulating layer 32 and the glow tube 16.
- the electrical insulation is carried out by an electrical insulation layer 33 formed in the opening 22 in the region of the sealing section 23 on the inner wall of the glow tube 16.
- the sealing element 31 made of graphite is pressed between the insulating layer 33 and the connecting bolt 17.
- the electrical insulation layers 32 and 33 may consist, for example, of glass, silicate, borosilicate or bosilicate glass, metal oxides, metal nitrides or metal oxynitrides and be deposited by means of processes known per se, for example by means of gas phase deposition on the connection bolts 17 and / or on the inner wall of the glow tube 16 applied.
- An effective radiator seal 30 between glow tube 16 and connecting bolt 17 is realized by the sealing element 31 is pushed in the form of a pre-pressed Grafitrings on the connecting bolt 17 in the region of the electrical insulation layer 32, 33, so that the pre-pressed graphite ring in the opening 22nd of the glow tube 16 in the region of the sealing portion 23 is located. Subsequently, the glow tube 16 is reduced, for example, by swaging in diameter in the form of the diameter reduction 26, whereby the glow tube 16 is pressed in the region of the sealing portion 23 on the pre-pressed graphite ring. As a result, the pre-pressed graphite ring in the opening 22 of the glow tube 16 in the region of the sealing portion 23 between the glow tube 16 and terminal bolt 17 is pressed. The graphite ring used in vorgepresster form is deformed, thereby forming between the glow tube 16 and connecting bolt 17, the sealing element 31 made of graphite and thus the radiator seal 30 is formed.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
- Gasket Seals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010062438A DE102010062438A1 (de) | 2010-12-06 | 2010-12-06 | Glühkerze und Verfahren zu deren Herstellung |
| PCT/EP2011/068708 WO2012076246A1 (de) | 2010-12-06 | 2011-10-26 | Glühkerze mit graphitdichtung und elektrischer isolierschicht |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2649374A1 true EP2649374A1 (de) | 2013-10-16 |
| EP2649374B1 EP2649374B1 (de) | 2014-10-08 |
Family
ID=44863035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11775780.7A Active EP2649374B1 (de) | 2010-12-06 | 2011-10-26 | Glühkerze mit graphitdichtung und elektrischer isolierschicht |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2649374B1 (de) |
| CN (1) | CN103250002B (de) |
| DE (1) | DE102010062438A1 (de) |
| WO (1) | WO2012076246A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3025153B1 (fr) * | 2014-09-01 | 2016-12-09 | Bosch Gmbh Robert | Bougie de prechauffage |
| CN104439693A (zh) * | 2014-12-08 | 2015-03-25 | 西安创新精密仪器研究所 | 同种或异种金属材料管材与棒材之间的旋锻连接工艺 |
| DE102015205665A1 (de) * | 2015-03-30 | 2016-10-06 | Robert Bosch Gmbh | Glühstiftkerze mit einem Glühstift und Verbrennungskraftmaschine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1119597B (de) * | 1958-11-13 | 1961-12-14 | Bosch Gmbh Robert | Gluehkerze fuer Brennkraftmaschinen |
| DE4335292A1 (de) * | 1993-10-15 | 1995-04-20 | Beru Werk Ruprecht Gmbh Co A | Glühkerze |
| IT235871Y1 (it) * | 1995-05-31 | 2000-07-18 | Cooper Ind Inc | Guarnizione oscillante e autopulente per una resistenza corazzata diuna candela di pre-riscaldo per motori diesel |
| DE19914619A1 (de) * | 1999-03-31 | 2000-10-12 | Beru Ag | Verfahren zum abdichtenden Verschließen des anschlußseitigen Endbereichs des Glührohres einer Glühkerze und Glühkerzen mit verfahrensgemäßem Verschluß |
| DE102004043874A1 (de) | 2004-09-10 | 2006-03-16 | Robert Bosch Gmbh | Vorrichtung zur Erfassung des Drucks in einem Brennraum einer Verbrennungskraftmaschine |
| US20090184101A1 (en) * | 2007-12-17 | 2009-07-23 | John Hoffman | Sheathed glow plug |
| US20100059496A1 (en) | 2008-09-08 | 2010-03-11 | Federal-Mogul Ignition Company | Metal sheath glow plug |
-
2010
- 2010-12-06 DE DE102010062438A patent/DE102010062438A1/de not_active Withdrawn
-
2011
- 2011-10-26 CN CN201180058562.6A patent/CN103250002B/zh not_active Expired - Fee Related
- 2011-10-26 WO PCT/EP2011/068708 patent/WO2012076246A1/de not_active Ceased
- 2011-10-26 EP EP11775780.7A patent/EP2649374B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012076246A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103250002A (zh) | 2013-08-14 |
| CN103250002B (zh) | 2015-04-01 |
| DE102010062438A1 (de) | 2012-06-06 |
| WO2012076246A1 (de) | 2012-06-14 |
| EP2649374B1 (de) | 2014-10-08 |
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