EP3378136A1 - Pre-chamber spark plug and method for producing a pre-chamber spark plug - Google Patents
Pre-chamber spark plug and method for producing a pre-chamber spark plugInfo
- Publication number
- EP3378136A1 EP3378136A1 EP17840552.8A EP17840552A EP3378136A1 EP 3378136 A1 EP3378136 A1 EP 3378136A1 EP 17840552 A EP17840552 A EP 17840552A EP 3378136 A1 EP3378136 A1 EP 3378136A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cap
- spark plug
- chamber
- passages
- crossing
- 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 title claims abstract description 10
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000005480 shot peening Methods 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/54—Sparking plugs having electrodes arranged in a partly-enclosed ignition chamber
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
- H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/12—Engines characterised by precombustion chambers with positive ignition
Definitions
- the present invention is based on a prechamber spark plug with a housing, a ground electrode, a cap that closes the antechamber, and a center electrode arranged inside the prechamber, wherein transfer passages are formed in the cap. Furthermore, the present invention relates to a method for producing such a prechamber spark plug.
- a pre-chamber spark plug is known, for example, from WO 2007/092972 A1.
- This spark plug comprises a pre-chamber provided with a pre-chamber wall and a cover surface.
- the prechamber wall has a cylindrical part on which rectangular ground electrode electrodes are likewise fastened by means of rectangular ground electrode carriers.
- the ground electrodes are associated with rectangular center electrodes, which are attached to a central center electrode carrier.
- a plurality of Zünd vomclame are created, with which one should take place with respect to the pre-chamber as possible central ignition.
- the pre-chamber wall comprises several crossing passages.
- the crossing passages are designed in such a way that they extend parallel to the longitudinal axis of the pre-chamber or converge towards one another.
- the present invention is therefore based on the object to design and develop a pre-chamber spark plug of the type mentioned in such a way and further, that an optimal ignition of the fuel-air mixture is achieved with structurally simple means and thus cost in the production. Furthermore, a method for producing such a pre-chamber spark plug is to be specified.
- a Vorschzündkerze with a housing, a ground electrode, a pre-chamber cap and a arranged inside the prechamber ignition electrode, wherein in the cap passage passages are formed, characterized in that the center axes of the transfer passages seen in the direction of the main combustion chamber diverge.
- the ignition shadows of a prechamber spark plug can be improved in a particularly simple manner by the center axes of the crossing passages diverge as seen in the direction of the end of the cap facing the main combustion chamber.
- the center axes of the transfer passages do not run parallel to one another, so that the ignition torches entering from the transfer passages into the main combustion chamber diverge.
- the prechamber spark plug according to the invention is suitable, for example, for use with a stationary gas engine.
- the pre-chamber spark plug according to the invention is used in a non-stationary gasoline engine, namely due to the ignition properties achieved by the arrangement of the crossing passages.
- a symmetrical transfer passage for example a cylindrical passage
- the center axis of the transfer passage corresponds to the axis of symmetry of the transfer passage.
- the center axis of the main propagation direction corresponds to the ignition torch passing through the crossing passage.
- the crossing passages may be cylindrical. It should be noted that in the following for an area specification, the limit values that form the area are also explicitly part of the specified area. In an advantageous manner, in particular in the circumferential direction, 4 to 8 crossing passages may be formed.
- a central transfer passage is formed, whose center axis is arranged on the longitudinal axis of the pre-chamber or runs at least substantially parallel to the longitudinal axis of the prechamber.
- the center axes of the crossing passages can each extend at a distance x offset from the respective main axis of the prechamber.
- the main axis is the axis that runs parallel to the center axis of the crossing passage and intersects the longitudinal axis of the prechamber.
- the longitudinal axis of the prechamber corresponds to the symmetry axis of the prechamber in the case of a symmetrical prechamber.
- the longitudinal axis of the center axis corresponds to the prechamber. Consequently, the crossing passages are tangent to the outer diameter of the cap, not radially.
- the ratio ein between the distance x, the center axis of a crossing passage i from the main axis of the prechamber and the largest inner diameter D of the cap is in the range of 0.04 to 0.40, in particular 0.05 to 0.35 , preferably from 0.06 to 0.30.
- the ratio of the total cross-sectional area A of all crossing passages to the largest inner diameter D of the cap can be in the range from 0.40 mm to 0.95 mm, preferably from 0.45 mm to 0.80 mm.
- the opening angle ⁇ defined by the center axes of the crossing passages may be in the range of 100 ° to 160 °.
- the material forming the cap can have a mass fraction of nickel of more than 99% or be made of a nickel alloy with proportions of iron, cobalt and chromium.
- mass fraction refers to the value of the quotient of the mass of the nickel and the total mass of the cap.
- the material forming the cap can be made to be compact on the inside of the cap, at least in the region of the transfer passages. As a result of this measure, crack formation is prevented in this region of the cap which is subjected to particularly high loads. It is also conceivable that the entire surface of the inside of the cap has a correspondingly compacted material.
- the cap is produced by a forming process.
- the cap is produced by the method according to the invention particularly material-saving.
- the forming process may preferably be extrusion or deep drawing.
- the cap thus produced can be connected to the housing of the prechamber spark plug, in particular welded.
- the cap can be welded to the housing by a vacuum welding process. The welding is carried out in a vacuum environment with less than 50 mbar vacuum, in particular in a corresponding chamber.
- the cap is connected to the housing by means of tungsten inert gas welding, plasma welding, laser welding or electron beam welding.
- the crossing passages can be produced by a machining process, for example by drilling.
- a machining process for example by drilling.
- the center axes and diameter of the crossing passages can be produced in a particularly simple and precise manner.
- the material forming the cap on the inside of the cap can be compressed, at least in the region of the particularly stressed crossing passages.
- the material can be compacted by sandblasting or shot peening. This has the further advantage that at the same time the transfer passages are deburred by sandblasting or shot peening, which has a positive effect on the ignition properties and the longevity of the pre-chamber spark plug.
- the material of the cap can be compressed accordingly on the entire inner side.
- FIG. 1 is a schematic, partially sectioned view of an embodiment of a pre-chamber spark plug according to the invention
- 2 is an enlarged view of a detail of FIG. 1
- Fig. 3 is a schematic representation of a section through the cap of a pre-chamber spark plug according to the invention.
- FIG. 4 shows a schematic, partially sectioned illustration of a part of a further pre-chamber spark plug according to the invention.
- the prechamber spark plug has a housing 3 formed from a first housing part 1 and a second housing part 2.
- the housing parts 1, 2 are connected to each other via a weld.
- the housing 1 surrounds a portion of an insulator 4.
- a supply line not shown, is arranged, which supplies the provided within the prechamber 5 center electrode 6 with electrical voltage.
- the center electrode 6 comprises a total of four electrode arms 7. However, the center electrode 6 may also have a different geometry.
- the first housing part 1 serves as a ground electrode and has an external thread 8 to screw the Vorschzündkerze in a housing cover of the main combustion chamber.
- the pre-chamber 5 is closed by the cap 9 in the direction of the main combustion chamber.
- the cap 9 is welded to the first housing part 1 in the embodiment shown here. It is conceivable that the cap 9 extends to the center electrode 6 and serves as a ground electrode.
- the cap 9 has a plurality of crossing passages 10 circumferentially arranged around the cap 9. In Fig. 2 of two crossing passages 10, the central axes 1 1 are shown. The central axes 1 1 run apart in the direction of the main combustion chamber.
- the opening angle ⁇ defined by the main axes of the crossing passages 10 is shown.
- the opening angle ⁇ is preferably in the range of 100 ° to 160 °.
- the largest inner diameter D of the pre-chamber 5 is shown.
- FIG. 3 is a schematic representation of a section through the pre-chamber 5 of a pre-chamber spark plug according to the invention. It is clear from this that the center axes 1 1 of the crossing passages 10 are each arranged at a distance x offset from the respective main axis 12. The corresponding with a central axis 1 1 main axis 12 is defined by the straight line which is parallel to the central axis 1 1 of a crossing passage 10 and the longitudinal axis 13 of the pre-chamber intersects. Furthermore, the diameter di of a transfer passage 10 is shown in FIG. A further exemplary embodiment of a pre-chamber spark plug according to the invention is shown in FIG. 4. The prechamber spark plug according to FIG. 4 corresponds to the exemplary embodiment illustrated in FIGS.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017202001.6A DE102017202001A1 (en) | 2017-02-08 | 2017-02-08 | Pre-chamber spark plug and a method for producing a pre-chamber spark plug |
PCT/DE2017/200136 WO2018145681A1 (en) | 2017-02-08 | 2017-12-18 | Pre-chamber spark plug and method for producing a pre-chamber spark plug |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3378136A1 true EP3378136A1 (en) | 2018-09-26 |
EP3378136B1 EP3378136B1 (en) | 2024-02-07 |
Family
ID=61192614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17840552.8A Active EP3378136B1 (en) | 2017-02-08 | 2017-12-18 | Pre-chamber spark plug and method for producing a pre-chamber spark plug |
Country Status (4)
Country | Link |
---|---|
US (1) | US11011892B2 (en) |
EP (1) | EP3378136B1 (en) |
DE (1) | DE102017202001A1 (en) |
WO (1) | WO2018145681A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6895243B2 (en) | 2016-12-08 | 2021-06-30 | 三菱重工エンジン&ターボチャージャ株式会社 | Sub-chamber gas engine |
JP7095570B2 (en) * | 2018-11-26 | 2022-07-05 | トヨタ自動車株式会社 | Internal combustion engine with sub-chamber |
JP6869283B2 (en) * | 2019-03-05 | 2021-05-12 | 日本特殊陶業株式会社 | Spark plug |
JP7001634B2 (en) * | 2019-05-07 | 2022-01-19 | 日本特殊陶業株式会社 | Spark plug |
JP6917420B2 (en) * | 2019-08-07 | 2021-08-11 | 日本特殊陶業株式会社 | Spark plug |
DE102020205320A1 (en) * | 2020-04-27 | 2021-10-28 | Dkt Verwaltungs-Gmbh | Prechamber spark plug, ignition electrode for a prechamber spark plug and method for producing an ignition electrode |
DE102021127035A1 (en) | 2021-10-19 | 2023-04-20 | Bayerische Motoren Werke Aktiengesellschaft | Pre-chamber device for an internal combustion engine, in particular a motor vehicle, and method for producing such a pre-chamber device |
DE102022201624A1 (en) * | 2022-02-16 | 2023-08-17 | Robert Bosch Gesellschaft mit beschränkter Haftung | prechamber spark plug |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3206708A1 (en) | 1982-02-25 | 1983-09-01 | Robert Bosch Gmbh, 7000 Stuttgart | SPARK PLUG WITH A CHAMBER |
DE3709976A1 (en) | 1987-03-30 | 1988-10-20 | Dieter Dr Ing Kuhnert | METHOD AND SPARK PLUG FOR THE IGNITION OF VERY LOW FUEL-AIR MIXTURES, ESPECIALLY FOR GAS ENGINES |
DE59500457D1 (en) * | 1994-03-29 | 1997-09-11 | Dieter Dr Ing Kuhnert | Pre-chamber ignition device |
ES2436381T3 (en) | 2006-02-17 | 2013-12-30 | Ge Jenbacher Gmbh & Co. Ohg | Spark plug |
US20070236122A1 (en) * | 2006-04-10 | 2007-10-11 | Borror Bruce M | Pre-chamber type spark plug |
US7770552B2 (en) * | 2007-10-31 | 2010-08-10 | Caterpillar Inc. | Laser igniter having integral pre-combustion chamber |
US20090107437A1 (en) * | 2007-10-31 | 2009-04-30 | Caterpillar Inc. | RF igniter having integral pre-combustion chamber |
DE102010010109B4 (en) * | 2010-03-04 | 2012-03-15 | Multitorch Gmbh | prechamber |
US8584648B2 (en) * | 2010-11-23 | 2013-11-19 | Woodward, Inc. | Controlled spark ignited flame kernel flow |
US9850805B2 (en) * | 2010-12-31 | 2017-12-26 | Prometheus Applied Technologies, Llc | Prechamber ignition system |
US9745892B2 (en) | 2010-12-31 | 2017-08-29 | Prometheus Applied Technologies, Llc | Prechamber ignition system |
DE102011076471B4 (en) | 2011-05-25 | 2016-02-18 | Mtu Friedrichshafen Gmbh | Prechamber spark plug and gas engine with such a prechamber spark plug |
US9500118B2 (en) * | 2011-09-03 | 2016-11-22 | Prometheus Applied Technologies, Llc | Method and apparatus for achieving high power flame jets while reducing quenching and autoignition in prechamber spark plugs for gas engines |
ES2651167T3 (en) * | 2013-03-12 | 2018-01-24 | Prometheus Applied Technologies, Llc | Active scan prechamber |
US10024220B2 (en) * | 2013-03-12 | 2018-07-17 | Prometheus Applied Technologies, Llc | Active scavenge prechamber |
DE102013109278B4 (en) * | 2013-08-27 | 2017-12-07 | Federal-Mogul Ignition Gmbh | Spark plug for a gas-powered internal combustion engine |
JP5978250B2 (en) | 2014-06-03 | 2016-08-24 | 日本特殊陶業株式会社 | Electrode tip for spark plug and spark plug |
DE102015204814B9 (en) | 2015-03-17 | 2016-07-14 | Dkt Verwaltungs-Gmbh | Pre-chamber spark plug for igniting a fuel-air mixture in an internal combustion engine |
-
2017
- 2017-02-08 DE DE102017202001.6A patent/DE102017202001A1/en active Pending
- 2017-12-18 US US16/484,356 patent/US11011892B2/en active Active
- 2017-12-18 WO PCT/DE2017/200136 patent/WO2018145681A1/en unknown
- 2017-12-18 EP EP17840552.8A patent/EP3378136B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
US11011892B2 (en) | 2021-05-18 |
EP3378136B1 (en) | 2024-02-07 |
WO2018145681A1 (en) | 2018-08-16 |
DE102017202001A1 (en) | 2018-08-09 |
US20200036166A1 (en) | 2020-01-30 |
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