EP2607681A2 - Dispositif thermoconducteur destiné à dévier la chaleur d'un culot métallique de bougie d'allumage - Google Patents

Dispositif thermoconducteur destiné à dévier la chaleur d'un culot métallique de bougie d'allumage Download PDF

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Publication number
EP2607681A2
EP2607681A2 EP20120008099 EP12008099A EP2607681A2 EP 2607681 A2 EP2607681 A2 EP 2607681A2 EP 20120008099 EP20120008099 EP 20120008099 EP 12008099 A EP12008099 A EP 12008099A EP 2607681 A2 EP2607681 A2 EP 2607681A2
Authority
EP
European Patent Office
Prior art keywords
spark plug
heat
conducting device
heat conducting
housing
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.)
Withdrawn
Application number
EP20120008099
Other languages
German (de)
English (en)
Inventor
Friedrich Gruber
Markus Kraus
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.)
Innio Jenbacher GmbH and Co OG
Original Assignee
GE Jenbacher GmbH and Co OHG
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 GE Jenbacher GmbH and Co OHG filed Critical GE Jenbacher GmbH and Co OHG
Publication of EP2607681A2 publication Critical patent/EP2607681A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P23/00—Other ignition
    • F02P23/04—Other physical ignition means, e.g. using laser rays
    • 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
    • H01T13/02—Details
    • H01T13/16—Means for dissipating heat

Definitions

  • the invention relates to a heat conducting device for dissipating heat of a spark plug housing of a spark plug, in particular laser spark plug, an internal combustion engine, in particular a stationary gas engine.
  • spark plugs used in such internal combustion engines Due to the constant effort to increase the power output of internal combustion engines, especially stationary high-performance gas engines, the spark plugs used in such internal combustion engines are exposed to increasingly high thermal loads.
  • the spark plugs used with electrode ignition or laser ignition are usually arranged either in a spark plug well of a cylinder head of the internal combustion engine or in a separate spark plug receptacle or spark plug, which in turn is attached to the cylinder head.
  • a laser spark plug To cool a laser spark plug is from the EP 1 519 038 A1 known to arrange a cooling device on a laser spark plug, which is equipped with one or more separate cooling systems.
  • active cooling is very complex and also leads to an enlarged design of the laser spark plug.
  • passive cooling systems are known for cooling laser spark plugs. That's how it shows DE 10 2009 000 487 A1 a laser spark plug with a passive heat sink that works on the convection principle.
  • the disadvantage here again is a relatively large size of the laser spark plug.
  • the passive heat sink is hindering the installation of the laser spark plug in a spark plug well or a spark plug sleeve.
  • the invention has therefore set itself the task of providing a comparison with the prior art improved cooling of a spark plug.
  • the design of the spark plug should be increased as little as possible and the spark plug should be able to be arranged in the usual manner in the spark plug shaft or in the spark plug sleeve.
  • the heat-conducting device is at least partially deformable, preferably elastically deformable, and substantially incompressible.
  • a proposed heat conducting device can be arranged on a lateral surface of a spark plug housing. Due to the deformability and incompressibility of the heat conducting device, this can be optimally molded to the shape of the spark plug housing, which can achieve the largest possible heat-dissipating contact surface between the heat conducting and spark plug housing. By a positive contact of the heat conducting device with the spark plug housing, an optimal thermal coupling can be achieved beyond.
  • the proposed réelleleitrioriques may be configured substantially annular or toroidal.
  • the heat-conducting device is substantially annular, preferably as a substantially closed ring, is trained.
  • the heat conducting device can also be designed as a non-closed ring or as a ring segment or generally as a ring-shaped bent tube.
  • the heat conducting device can also be designed to be wound, for example in the form of a helical spring.
  • the heat-conducting device can have any desired shape and, for example, can also be configured plate-shaped.
  • an inner surface of the proposed heat conducting device can be arranged substantially positive fit on a lateral surface of the spark plug housing, wherein it can be preferably provided that the spark plug housing is arranged with respect to a longitudinal axis of the spark plug radially outwardly projecting support web, for a first Support surface of the heat conducting device forms a defined stop.
  • a fastening device can be provided by which a force can be exerted on one of the first bearing surface of the heat conducting device in a cross section along the longitudinal axis of the spark plug substantially opposite second bearing surface of the heat conducting device.
  • the surface of the heat-conducting device can be brought into positive contact with the jacket surface of the spark plug housing and with an inner surface of a spark plug shaft or a spark plug sleeve.
  • the deformability and the incompressibility moreover, the contact surface between the surface of the heat conducting device and the lateral surface of the spark plug housing or the inner surface of the spark plug or the spark plug sleeve can be maximized, resulting in a maximum heat transfer surface for the intended heat dissipation from the spark plug housing.
  • the heat-conducting device comprises a heat-conducting medium with a transverse contraction number greater than 0.35, preferably greater than 0.4, particularly preferably substantially 0.5.
  • the heat transfer medium may include, for example, known in the art materials such as water or a thermal paste. Preferably, this includes dieitmedium a thermally conductive elastomer or consists essentially of it.
  • the transverse contraction number or Poisson's number is a known material property, which expresses the degree of compressibility of a material. It is defined as the negative ratio of relative change in thickness to relative change in length of a material under the action of an external force or stress.
  • a transverse contraction number of 0.5 means that the volume of a body of a corresponding material remains substantially constant under load despite changing the contour.
  • the surface of the heat-conducting device can also be formed by a wall. It can thus be provided that the heat-conducting device comprises an at least partially-preferably elastically-deformable wall, wherein the wall encloses the heat-conducting medium.
  • the wall may comprise silicone elastomer, nitrile-butadiene rubber and / or polychloroprene rubber or consist essentially of one or more of these substances.
  • Fig. 1a shows a plan view of an annular or torus-shaped heat conducting device 1 and Fig. 1 b shows a cross section of this Heat-conducting device 1 according to section line AA of Fig. 1a
  • the heat-conducting device 1 is designed as a substantially closed ring, which has an inner diameter 10.
  • the surface of the heat conducting device 1 is formed by an elastically deformable wall 5, which may for example consist of a silicone elastomer.
  • the wall 5 defines an interior 7 of the heat-emitting device 1, which is filled in this example with a thermally highly conductive heat-conducting medium 4 with a transverse contraction number of substantially 0.5, for example with a thermally conductive elastomer.
  • the heat-conducting device 1 can be plugged onto a spark plug 3 or a spark plug housing 2, so that an inner surface 11 of the heat-conducting device 1 rests against a lateral surface 20 of the spark plug housing 2 (see, for example, FIG Fig. 2 ).
  • Fig. 2 shows a proposed heat conducting device 1 in a possible installation situation on a spark plug 3 in a longitudinal section along a longitudinal axis L of the spark plug 3.
  • the spark plug 3 is arranged in this example in a spark plug sleeve 17, for example screwed.
  • the spark plug housing 2 of the spark plug 3 has in this example a with respect to the longitudinal axis L of the spark plug 3 radially outwardly projecting, circumferential support web 12 which forms a defined stop for a first bearing surface 13 of the heat conducting device 1.
  • the spark plug housing 2 is formed substantially cylindrical in the area shown, wherein a lateral surface 20 of the spark plug housing 2 has an outer diameter 9 which is smaller than or equal to the inner diameter 10 of the heat conducting device 1.
  • the heat-conducting device 1 can be plugged onto the spark plug housing 2 as far as the end area 16 of the spark plug housing 2 is shown, until the first bearing surface 13 comes to rest on the support web 12 of the spark plug housing 2.
  • the heat-conducting device 1 in the region of its first bearing surface 13 has a substantially rigid, circumferential stop region 6.
  • the second bearing surface 15 of the heat-conducting device 1 has a substantially rigid, circumferential stop region 6.
  • the rigid ones Stop regions 6 can be designed, for example, as corresponding stiffeners of the wall 5.
  • a clamping sleeve is provided with an external thread in this example, wherein the external thread of the clamping sleeve cooperates with a corresponding internal thread of the spark plug sleeve 17.
  • the fastening device 14 can be exercised in accordance with pressure on the heat conducting device 1 in the direction of the longitudinal axis L of the spark plug 3. Due to the deformability and incompressibility of the heat conducting device 1, a deformation of the surface or wall 5 of the heat conducting device 1 occurs, so that these each optimally and positively with its inner surface 11 to the outer surface 20 of the spark plug housing 2 and with its outer surface 18 against the inner surface As a result, the contact area between the heat-conducting device 1 and the adjacent components (spark plug housing 2 or spark plug sleeve 17) is maximized, so that in each case a large-area, positive-fit contact can be achieved for optimum heat transfer.
  • a heat prevailing on the lateral surface 20 of the spark plug housing 2 can thus be transmitted via the inner surface 11 of the heat-conducting device 1 to the heat-conducting medium 4 of the heat-conducting device 1 and subsequently removed via the outer surface 18 of the heat-conducting device 1 to the inner surface 19 of the spark plug sleeve 17.
  • Fig. 3 shows an arrangement according to Fig. 2 ,
  • a plurality of energy storage 8 are arranged in the form of compression springs.
  • an expansion of the heat-conducting device 1 can be facilitated, for example, for maintenance purposes, since the force accumulators 8 are discharged when the fastening device 14 is removed, whereby the thickness of the heat-conducting device 1 decreases in the radial direction with respect to the longitudinal axis L of the spark plug 3 and the heat-conducting device 1 itself thus easier to remove from the spark plug sleeve 17.
  • FIG. 2 shows a further exemplary embodiment of a proposed heat-conducting device 1.
  • two essentially rigid abutment regions 6 of the wall 5 are arranged by metal platelets or metal rings which are arranged on the first contact surface 13 and the second contact surface 15 of the heat-conducting device 1, educated.
  • a tension spring is used, which presses on the abutment portion 6 of the second support surface 15 of the heat conducting device 1 and the heat conducting device 1 thereby forms the spark plug housing 2 and the spark plug sleeve 17 and fixed in a stable position.
  • the tension spring used in this example as fastening device 14 By means of the tension spring used in this example as fastening device 14, mounting of the heat-conducting device 1 and a fixation-stable fixing of the spark plug 3 in a conventional spark plug sleeve 17 or a conventional spark plug shaft 22 of a cylinder head 21 can take place.
  • the spark plug sleeve 17 or the spark plug shaft 22 need not have any internal thread or other special devices, since this fastening device 14 does not interact directly with the spark plug sleeve 17 or the spark plug well 22.
  • the wall 5 of a proposed heat-conducting device 1 may, for example, at least partially consist of one or more of the materials silicone elastomer, nitrile-butadiene rubber or polychloroprene rubber and generally have a thickness of about 1 mm to 2 mm.
  • the width B of the heat conducting device 1 may be about 5 mm to 10 mm and the height H of the heat conducting device 1 may be about 20 mm to 40 mm.
  • a heat conducting medium 4 in a limited by the wall 5 interior 7 of the heat conducting device 1 water or a thermal paste, such as the known under the name Thermogrease high temperature grease can be used.
  • Fig. 5 shows a sectional view through a cylinder head 21, wherein in a spark plug well 22 of the cylinder head 21, a spark plug 3 is arranged.
  • a plurality of cooling devices 24 in the form of cooling channels are arranged in the cylinder head 21, through which a cooling medium, for example cooling water, flows and thereby cool the cylinder head 21.
  • the cylinder head 21 has a cylinder head bottom 23, by means of which, in the installation position of the cylinder head 21, a combustion space 25 of an internal combustion engine (not shown here) can be limited.
  • the cylinder head floor 23 forms an (upper) wall of a combustion chamber 25 of an internal combustion engine, for example a stationary gas engine.
  • the spark plug 3 is designed in this example as a laser spark plug and comprises a three-piece spark plug housing 2a, 2b, 2c, in which a solid-state laser 26 in shape a laser crystal is arranged.
  • the solid state laser 26 is connected via an optical waveguide to a pump module, not shown here, which comprises a pump light source, for example in the form of a semiconductor laser, and optically pumps the solid state laser 26 in a known manner.
  • the emerging from the solid-state laser 26 light beams are coupled via corresponding and known optical components at the combustion chamber end of the laser spark plug into the combustion chamber 25 of an internal combustion engine, wherein a plasma light or spark is generated at the focal point of the beams.
  • the spark plug housing 2 is executed in several parts in the example shown and comprises - along the longitudinal axis L of the spark plug 3 - in installation position a combustion chamber side housing part 2a, a combustion chamber facing away from housing part 2c and between the combustion chamber side housing part 2a and the combustion chamber facing away from the housing part 2c arranged middle housing part 2b. Between an outer surface 20 of the combustion chamber facing away from the housing part 2 c and an inner surface 19 of the spark plug well 22, an annular heat conducting device 1 is arranged on the spark plug 3.
  • the spark plug shaft 22 has an internal thread into which a fastening device 14 in the form of a clamping sleeve is screwed.
  • the fastening device 14 is screwed into the cylinder head 21 in the upper end region of the spark plug shaft 22 and presses with its lower end face 27 (see FIG Fig. 6a Due to the deformability and incompressibility of the heat conducting device 1 there is a deformation of the surface or wall 5 of the heat conducting device 1, so that they each optimally and positively with its inner surface 11 to the lateral surface 20 of the Spark plug housing 2c and with its outer surface 18 to the inner surface 19 of the spark plug shaft 22 can form. As a result, the spark plug 3 is pressed against a sealing seat in the region of the cylinder head bottom 23 and fixed in a stable position.
  • Fig. 6a shows a perspective view of a fastening device 14 in the form of a clamping sleeve and Fig. 6b shows a corresponding plan view.
  • the fastening device 14 has an external thread 28 for screwing the fastening device 14 with a corresponding internal thread on the spark plug shaft 22 of a cylinder head 21 or a spark plug sleeve 17.
  • two groove-shaped receptacles 29 are provided to attach a threaded wrench to the fastening device 14 can.
  • the heat-conducting device 1 is arranged in each case in the end region 16 of a spark plug 3 facing away from the combustion chamber.
  • This has the advantage, in particular in the case of laser spark plugs having a laser crystal arranged in the interior of the spark plug housing 2, that the immediate vicinity of the laser crystal can be cooled by applying the heat of the spark plug housing 2 to the spark plug sleeve 17 or a (usually cooled ) Cylinder head 21 can be removed.
  • this installation situation also has the advantage that the spark plug 3 itself is fixed in a stable position by the positionally stable fixation of the heat conducting device 1 in this area.
  • a proposed heat conducting device 1 is arranged at a different area of the spark plug housing 2 of a spark plug 3.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP20120008099 2011-12-23 2012-12-04 Dispositif thermoconducteur destiné à dévier la chaleur d'un culot métallique de bougie d'allumage Withdrawn EP2607681A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT18812011A AT512038B1 (de) 2011-12-23 2011-12-23 Wärmeleitvorrichtung zur ableitung von wärme eines zündkerzengehäuses einer zündkerze

Publications (1)

Publication Number Publication Date
EP2607681A2 true EP2607681A2 (fr) 2013-06-26

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EP20120008099 Withdrawn EP2607681A2 (fr) 2011-12-23 2012-12-04 Dispositif thermoconducteur destiné à dévier la chaleur d'un culot métallique de bougie d'allumage

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EP (1) EP2607681A2 (fr)
AT (1) AT512038B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013021547A1 (de) 2013-12-18 2014-07-31 Daimler Ag Zylinderkopf für eine Verbrennungskraftmaschine
CN103986064A (zh) * 2014-06-09 2014-08-13 张小亚 一种隔热型内燃机火花塞

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157164A (en) * 1963-09-20 1964-11-17 Worthington Corp Internal combustion engine spark plug assembly
JP4024320B2 (ja) * 1995-08-01 2007-12-19 日本特殊陶業株式会社 スパークプラグ
DE102009047010A1 (de) * 2009-11-23 2011-05-26 Robert Bosch Gmbh Laserzündkerze und Betriebsverfahren hierfür

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013021547A1 (de) 2013-12-18 2014-07-31 Daimler Ag Zylinderkopf für eine Verbrennungskraftmaschine
CN103986064A (zh) * 2014-06-09 2014-08-13 张小亚 一种隔热型内燃机火花塞
CN103986064B (zh) * 2014-06-09 2016-03-16 张小亚 一种隔热型内燃机火花塞

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Publication number Publication date
AT512038B1 (de) 2013-05-15
AT512038A4 (de) 2013-05-15

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