WO2017121524A1 - Bougie d'allumage comprenant une encoche ou une rainure dans l'isolateur ou dans le boîtier - Google Patents

Bougie d'allumage comprenant une encoche ou une rainure dans l'isolateur ou dans le boîtier Download PDF

Info

Publication number
WO2017121524A1
WO2017121524A1 PCT/EP2016/078523 EP2016078523W WO2017121524A1 WO 2017121524 A1 WO2017121524 A1 WO 2017121524A1 EP 2016078523 W EP2016078523 W EP 2016078523W WO 2017121524 A1 WO2017121524 A1 WO 2017121524A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulator
housing
spark plug
recess
shoulder
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.)
Ceased
Application number
PCT/EP2016/078523
Other languages
German (de)
English (en)
Inventor
Detlef Hartmann
Heribert Duetsch
Lars Menken
Andreas Benz
Arnold Schneider
Klaus BUNDSCHUH
Harald Jaeger
Jorge Diaz Alfonso
Oliver Brygier
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2017121524A1 publication Critical patent/WO2017121524A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/36—Sparking plugs characterised by features of the electrodes or insulation characterised by the joint between insulation and body, e.g. using cement

Definitions

  • the invention relates to a spark plug according to the preamble of the independent
  • the inner sealing disc has sharp edges. These trailing edges cause in the electrical wiring in the operation of the spark plug strong inhomogeneous electric fields, which emerge from the inner sealing disc in the region of the spoiler edge. Due to the structural proximity of the inner sealing disc to the insulator, these strong field peaks extend into the insulator and reduce the dielectric strength of the insulator at the points of the insulator, in which the electric field extends into the insulator. In these places it can be too electrical
  • the provision according to the invention of a recess on the shoulder of the insulator and / or on the seat of the housing has the advantage that the dielectric strength of the insulator and thus of the entire spark plug is improved. Furthermore, the tensile stress in the foot groove produced during the assembly of the spark plug is avoided or the tensile stress occurs in a thicker-walled and thus more robust region of the insulator. It results in a higher confusingbiegefestmaschine the spark plug. Overall, the life of the spark plug is extended.
  • the shoulder of the insulator and the seat of the housing are arranged opposite each other.
  • the shoulder of the insulator is meant a region of the insulator along the length of which the insulator changes its diameter. Accordingly, as the seat of the
  • Housing refers to an area on the length of the inner diameter of the housing changes.
  • the length of the shoulder or the seat extends parallel to the central axis of the spark plug.
  • the insulator rests with its shoulder on the seat of the housing. It is possible that a sealing element is arranged between the shoulder and the seat of the housing. Then the insulator rests with its shoulder on the sealing element and the sealing element rests on the seat of the housing.
  • a first group the spark plug without an inner sealing element in the region of the shoulder of the insulator and the oppositely arranged seat in Casing.
  • the shoulder of the insulator and / or the seat of the housing with one or more recesses By the corresponding design of the shoulder of the insulator and / or the seat of the housing with one or more recesses, the insulator-housing transition of the assembled spark plug can be gas-tight even without an inner sealing element.
  • the inner sealing element is arranged in the recess.
  • the recess is arranged on a side facing away from the central axis of the spark plug portion of the shoulder of the insulator or the seat of the housing. This results in a greater effective distance between the sealing element and the
  • the recess has a depth ⁇ , ⁇ of not greater than 1/2 of the maximum width of the shoulder of the insulator without recess, in particular, the recess has a depth ⁇ , ⁇ of not greater than 1/3 of the maximum width Bi the shoulder of the insulator without recess. This ensures that the insulator still has a sufficient wall thickness even with recess without affecting the mechanical or electrical robustness of the insulator.
  • Notch TA G not greater than 1/2, in particular not greater than 1/4, the maximum width B G of the seat of the housing assuming that no recess is formed. This ensures that the housing or the seat of the housing still has a sufficient wall thickness even with a recess, without the mechanical robustness of the housing is impaired.
  • the width of the shoulder or the width of the seat of the housing is measured along a direction perpendicular to the central axis of the insulator direction.
  • the wall thickness of the insulator or the wall thickness of the housing is measured at the widest point of the shoulder or the seat on the assumption that the recess does not exist.
  • the depth of the recess extends from the surface of the insulator or the
  • the recess is formed as a groove or a notch.
  • the groove typically has two sides and a bottom, the sides not being necessarily perpendicular to the bottom.
  • a notch has two sides. The angle enclosed by the sides is for example less than 100 °, in particular less than 85 °. Notches whose sides enclose an angle of about 90 ° are called steps.
  • the notch may also be formed as a double or multiple notch.
  • one side of the notch or groove extends parallel to the
  • the depth of the notch or groove corresponds to the length of the side which is aligned parallel to the center axis of the spark plug.
  • the shoulder of the insulator and the seat of the housing each have a recess. It is particularly advantageous if the recesses are designed to match each other, i. Even without a sealing element, the spark plug in the assembled state at this insulator-housing transition is gas-tight.
  • the recesses may be selected on the seat of the housing and on the shoulder so that the seat of the housing and the shoulder have mutually complementary shapes.
  • the complementary shapes may be a groove-notch combination or a step-step combination.
  • the notch may, for example, be arranged on the seat of the housing or on the shoulder such that a projection results, which fits into the groove arranged on the opposite component.
  • the seat of the housing or the shoulder of the insulator have two notches, which are arranged so that a step-shaped projection is formed, which in turn fits into a step-shaped notch on the opposite component.
  • the combinations are designed so that in the assembled spark plug, the transition from the insulator to the housing through the resting on the seat of the housing shoulder of the insulator is gas-tight.
  • a sealing element is arranged in the recess.
  • Sealing element may have a round or polygonal, in particular square, cross-section.
  • the sealing element be arranged in a recess, resulting in the advantage that the position of the sealing element in the region of the shoulder of the insulator and / or in the region of the seat of the housing can be better defined and ensured. Without the formation of the recess can in the assembly of the spark plug, in particular due to the deformation of the sealing element, the
  • Seal element to move further than desired in the direction of the central axis of the spark plug and thus reduce the distance to the center electrode.
  • the depth of the recess is smaller than the diameter of the sealing element cross-section.
  • the side lengths of the notch are smaller than the diameter of the sealing element cross-section or at a
  • the cross section has a greater width than the length of the notched mainly perpendicular to the central axis of the spark plug side of the notch.
  • Sealing element cross-section greater than the depth of the groove or the width of the groove is smaller than the width of the rectangular cross-section of the sealing element.
  • the width of the groove results as a distance between the sides of the groove.
  • the recess are located on the combustion chamber closest seat of the housing or the combustion chamber closest to the shoulder of the insulator or both.
  • the recess or the recesses are formed along the entire circumference of the insulator or of the housing.
  • FIG. 1 shows an example of a spark plug Figure 2 shows an enlargement of the circled in Figure 1 area for a first
  • FIG. 3 shows an enlargement of the area circled in FIG. 1 for a second exemplary embodiment of the spark plug according to the invention
  • FIG. 4 shows an enlargement of the area circled in FIG. 1 for a third one
  • FIG. 5 shows an enlargement of the area circled in FIG. 1 for a fourth
  • the spark plug 1 shows a half-sectional view of a spark plug 1.
  • the spark plug 1 comprises a housing 2.
  • an insulator 3 is inserted.
  • the housing 2 and the insulator 3 are each hollow inside.
  • a center electrode 6 is inserted in the insulator 3.
  • a connecting bolt 8 extends between the insulator 3
  • Center electrode 6 and the terminal bolt 8 is located in the insulator 3 a
  • the resistance element 9 connects the center electrode 6 in an electrically conductive manner to the connection bolt 8.
  • the resistance element 9 is, for example, as a layer system composed of a first contact chip, a
  • Resistance elements differ in their material composition and the resulting electrical resistance.
  • the first contact chip and the second contact chip can have a different or a same electrical resistance.
  • a ground electrode 7 is arranged electrically conductive on the combustion chamber-facing end side. Between the ground electrode 7 and the center electrode 6, a spark is generated.
  • the spark plug 1 extends around a central axis X-X.
  • the housing 2 has a shaft. On this shaft are a polygon 16, a
  • the thread 17 serves for
  • the outer sealing element 10 is designed in this embodiment as a folding seal.
  • the housing 2 has a seat 5 on its inside. On the insulator 3, a shoulder 4 is formed. With this shoulder 4, the insulator 3 rests on the seat 5. Between the shoulder 4 of the insulator 3 and the seat 5 of the housing 2, a sealing element may be arranged. The area 11 of the seat 5 and the shoulder 4 is marked in the figure 1 by a circle.
  • the shoulder 4 of the insulator 3 and the seat 5 of the housing 2 may also be formed to be complementary to each other, so that the two components seal the insulator-housing junction at the assembled spark plug gas-tight. In this case, it is possible to dispense with an additional sealing element between insulator 3 and housing 2.
  • Housing 2 and the shoulder 4 of the insulator 3 are considered in more detail in the following figures 2 to 5.
  • the shoulder 4 of the insulator 3 has a recess in the form of a notch 14 or more precisely in the form of a step.
  • the recess is formed on one of the central axis X-X of the spark plug 1 facing away from the shoulder 4 of the insulator 3.
  • the dashed line indicates the course of the surface of the shoulder without a formation of the recess.
  • the aligned perpendicular to the center axis XX of the spark plug 1 side of the recess or the notch 14 has the length of about 1/4 of the maximum width Bi of the shoulder 4 of the insulator 3.
  • the two sides of the notch close an angle of about 90 ° or less.
  • the diameter of the sealing element cross-section is greater than the depth ⁇ , ⁇ of the recess.
  • the depth ⁇ , ⁇ of the recess or notch 14 corresponds to the lengths of the side of the recess aligned parallel to the central axis.
  • the depth ⁇ , ⁇ of the recess or the notch 14 is approximately 1/3 of the maximum width Bi of the shoulder 4th
  • FIG. 3 shows a second exemplary embodiment of the region 11 of the seat 5 of the housing 2 and the shoulder 4 of the insulator 3.
  • the seat 5 of the housing 2 has a Recess in the form of a groove 15. As shown in this embodiment, the sides of the groove 15 may have a non-right angle to the bottom of the groove 15.
  • the dashed line indicates the course of the surface of the seat 5 of the housing 2 without a formation of the recess.
  • the diameter of the sealing element cross-section is greater than the depth T A , G of the recess or the groove 15.
  • the depth T A , G of the recess or the groove 15 is approximately 1/4 of the maximum width B G of the seat. 5 of the housing 2.
  • the width of the groove 15 is greater than the diameter of the sealing element cross-section.
  • FIG 4 shows a third embodiment of the region 11 of the seat 5 of the housing 2 and the shoulder 4 of the insulator 3 is shown. In each case, a recess is arranged in each case on the seat 5 of the housing 2 and on the shoulder 4 of the insulator 3. A notch-groove combination is shown.
  • the shoulder 4 of the insulator 3 has a recess in the form of a notch 14 or more precisely in the form of a step.
  • the recess is formed on one of the central axis X-X of the spark plug 1 facing portion of the shoulder 4 of the insulator 3. It arises
  • Projection 141 is formed on the side facing away from the central axis X-X of the spark plug 1 portion of the shoulder 4 of the insulator 3.
  • the dashed line indicates the course of the surface of the shoulder without a formation of the recess.
  • the two sides of the notch include an angle of about 90 °.
  • the depth ⁇ , ⁇ of the recess or notch 14 is approximately 1/4 of the maximum width Bi of the shoulder 4 of the insulator 3.
  • the seat 5 of the housing 2 has a recess in the form of a groove 15. As shown in this embodiment, the sides of the groove 15 may have a non-right angle to the bottom of the groove 15.
  • the dashed line indicates the course of the surface of the seat 5 of the housing 2 without a formation of the recess.
  • the depth TA, G of the recess or the groove is about 1/3 of the maximum width BG of the seat 5 of
  • the projection 141 and the groove 15 are arranged to each other so that in the mounted state of the spark plug, the projection 141 is inserted into the groove 15.
  • a sealing element 12 is arranged with a rectangular cross-section.
  • the width of the rectangular cross section is greater than the width of the groove.
  • the sealing element 12 is pressed into the groove 15 during assembly of the spark plug. In this case, the sealing element 12 is deformed and unfolds its sealing function.
  • 5 shows a fourth embodiment of the region 11 of the seat 5 of the housing 2 and the shoulder 4 of the insulator 3 is shown. In this case, two recesses are arranged on the seat 5 of the housing 2 and a recess on the shoulder 4 of the insulator 3. It is a notch-notch combination or a level-step combination shown.
  • the shoulder 4 of the insulator 3 has a recess in the form of a notch 14 or more precisely in the form of a step.
  • the recess is formed on one of the central axis XX of the spark plug 1 facing away from the shoulder 4 of the insulator 3.
  • two notches 14 and stages are arranged.
  • a notch is disposed on the portion of the seat 5 facing the center axis XX of the spark plug and the other notch is disposed on the portion of the seat 5 facing away from the center axis XX of the spark plug. This results in a stepped projection 151.
  • the step-shaped is formed on one of the central axis XX of the spark plug 1 facing away from the shoulder 4 of the insulator 3.
  • a sealing member 12 having a rectangular cross section is disposed between the step-shaped recess 14 on the shoulder 4 and the step-shaped projection 151 on the seat 5.
  • the cross section of the sealing element 12 is wider than the side length of the perpendicular to the central axis X-X of the spark plug 1 aligned side of the stepped recess 14 and also perpendicular to the central axis X-X of
  • Spark plug 1 aligned side of the stepped projection 151. This ensures that during the assembly of the spark plug, the sealing element is deformed and can thus develop its sealing function.

Landscapes

  • Spark Plugs (AREA)

Abstract

L'invention concerne une bougie d'allumage (1), comprenant un boîtier (2) et un isolateur (3) disposé dans le boîtier (2) ainsi qu'une électrode centrale (6) disposée dans l'isolateur (3) et une électrode de masse (7) disposée sur le boîtier (2). Le boîtier (2) possède au moins un siège (5) et l'isolateur (3) au moins un épaulement (4). L'épaulement (4) de l'isolateur (3) est disposé à l'opposé du siège (5) du boîtier (2). Au moins un évidement est formé sur l'épaulement (4) de l'isolateur (3) et/ou sur le siège (5) du boîtier (2).
PCT/EP2016/078523 2016-01-15 2016-11-23 Bougie d'allumage comprenant une encoche ou une rainure dans l'isolateur ou dans le boîtier Ceased WO2017121524A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016200430.1A DE102016200430A1 (de) 2016-01-15 2016-01-15 Zündkerze mit einer Kerbe oder einer Nut im Isolator oder im Gehäuse
DE102016200430.1 2016-01-15

Publications (1)

Publication Number Publication Date
WO2017121524A1 true WO2017121524A1 (fr) 2017-07-20

Family

ID=57391970

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/078523 Ceased WO2017121524A1 (fr) 2016-01-15 2016-11-23 Bougie d'allumage comprenant une encoche ou une rainure dans l'isolateur ou dans le boîtier

Country Status (2)

Country Link
DE (1) DE102016200430A1 (fr)
WO (1) WO2017121524A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018233890A1 (fr) * 2017-06-20 2018-12-27 Robert Bosch Gmbh Bougie d'allumage pourvue d'un siège d'isolateur à plusieurs étages
JP2021077551A (ja) * 2019-11-12 2021-05-20 日本特殊陶業株式会社 スパークプラグ

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017217265A1 (de) 2017-09-28 2019-03-28 Robert Bosch Gmbh Zündkerzen-Widerstandselement mit feineren nicht-leitenden Partikeln

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250355A (en) * 1937-06-08 1941-07-22 Bruck Josef Packing for insulators in sparking plugs
DE2026761A1 (de) * 1969-06-16 1971-01-07 Champion Spark Plug Company Toledo Ohio (V St A ) Dichtungsloser Sitz fur Zündkerzen und Verfahren zu seiner Herstellung
US20120192824A1 (en) * 2010-12-29 2012-08-02 John Antony Burrows Corona igniter having improved gap control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250355A (en) * 1937-06-08 1941-07-22 Bruck Josef Packing for insulators in sparking plugs
DE2026761A1 (de) * 1969-06-16 1971-01-07 Champion Spark Plug Company Toledo Ohio (V St A ) Dichtungsloser Sitz fur Zündkerzen und Verfahren zu seiner Herstellung
US20120192824A1 (en) * 2010-12-29 2012-08-02 John Antony Burrows Corona igniter having improved gap control

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018233890A1 (fr) * 2017-06-20 2018-12-27 Robert Bosch Gmbh Bougie d'allumage pourvue d'un siège d'isolateur à plusieurs étages
US11165226B2 (en) 2017-06-20 2021-11-02 Robert Bosch Gmbh Spark plug including a multi-step insulator seat
JP2021077551A (ja) * 2019-11-12 2021-05-20 日本特殊陶業株式会社 スパークプラグ
CN112864809A (zh) * 2019-11-12 2021-05-28 日本特殊陶业株式会社 火花塞
JP7001655B2 (ja) 2019-11-12 2022-01-19 日本特殊陶業株式会社 スパークプラグ
CN112864809B (zh) * 2019-11-12 2022-07-08 日本特殊陶业株式会社 火花塞

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