• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A spark plug (10) for an internal combustion engine, having a centre electrode (11), which comprises a first body (14) consisting of an electrode base material and a second body (15) consisting of a precious metal, which is welded to the first body (14), having an earth electrode (12) which in the radial direction is arranged roundabout the centre electrode (11), having an annular ignition gap (13) formed between the centre electrode (11) and the earth electrode (12) for igniting a fuel mixture by way of an ignition spark forming between the centre electrode (11) and the earth electrode (12), wherein the second body (15) of the centre electrode (11) is formed as an annular element having a central recess (17), wherein the first body (14) of the centre electrode (11) comprises a main body (14a) and a projection (14b), which extends into the recess (17) of the second body (15), wherein a first weld seam (18) is formed between a radially outer surface (20) of the projection (14b) of the first body (14) and a radially inner surface (21) of the second body (15) delimiting the recess (17) of the second body (15), and wherein a second weld seam (19) is formed between an axial surface (24) of the main body (14) of the first body (14) and an axial surface (25) of the second body (15).
    公开号:FI20195255A1
    申请号:FI20195255
    申请日:2019-04-01
    公开日:2019-11-04
    发明作者:Björn Dirumdam
    申请人:Man Energy Solutions Se；
    IPC主号:
    专利说明:

    SPARK PLUG FOR AN INTERNAL COMBUSTION ENGINE
    The invention relates to a spark plug for an internal combustion engine according to the preamble of claim 1.
    Spark plugs serve for electrically igniting a fuel mixture to be combusted in an internal combustion engine. Between a so-called centre-electrode and a socalled earth electrode of a spark plug an ignition gap is formed, in which for igniting the fuel mixture an electric ignition spark can form.
    20195255 prh 01 -04- 2019
    Spark plugs are basically distinguished between spark plugs having a hook-shaped earth electrode and spark plugs having an annular earth electrode. Accordingly, DE 10 2011 0277 279 Al shows a spark plug whose earth electrode is formed hook-like, wherein the ignition gap seen in the axial direction of the centre electrode extends axially between an end of the centre electrode and an end of the hook-like earth electrode. A spark plug having an annular earth electrode is known from DE 10 2012 208 069 Al, wherein the ignition gap then extends between the centre electrode and the earth electrode roundabout the centre electrode. The invention present here relates to a spark plug having an annular earth electrode, i.e. an ignition gap extending in the radial direction roundabout the centre electrode .
    From practice it is known that an earth electrode is composed of two bodies, namely of a first body which is produced from a basic electrode material and of a second body, which is produced from a precious metal, wherein the two bodies are welded together.
    With spark plugs known from practice there is the risk that the two bodies of the centre electrode become detached from one another and the second body produced from precious metal enters the combustion chamber of the cylinder comprising the spark plug and under certain condition is discharged out of the combustion chamber into the exhaust system of the internal combustion engine. This can cause damage to the internal combustion engine.
    There is therefore a need for a spark plug with which the risk that the bodies of the centre electrode become detached is reduced.
    Starting out from this, the invention is based on the object of creating a new type of spark plug for an internal combustion engine. This object is solved through a spark plug according to claim 1. According to the invention, the second body of the centre electrode is designed as an annular element with a central recess. The first body of the centre electrode comprises a main body and a projection, which extends into the recess of the second body. A first weld seam is formed between a radially outer surface of the projection of the first body and a radially inner surface of the second body delimiting the recess of the second body. A second weld seam is formed between an axial surface of the main body of the first body and an axial surface of the second body.
    20195255 prh 01 -04- 2019
    Through the configuration of the centre electrode of the spark plug out of the first body comprising the projection and the second body formed as an annular element according to the invention, and through the joining of these two bodies by way of the two weld seams, the risk that the second body becomes detached from the first body and causes damage to the internal combustion engine is significantly reduced. The two weld seams increase the weld area and can be reliably formed by simple welding.
    According to an advantageous further development of the invention, the first weld seams extends seen in the axial direction emanating from an end face of the centre electrode into the same. The second weld seam extends seen in the radial direction emanating from a circumferential surface of the centre electrode into the same. This orientation of the two weld seams increases particularly advantageously the weld area that is available and allows a reliable forming of the two weld seams.
    20195255 prh 01 -04- 2019
    Preferentially, the diameter d of the projection and the axial extension h of the projection are dimensioned so that the following applies: d < 8h. This feature also serves for enlarging the weld area that is available .
    Preferentially a material recess is introduced into an end face of the projection of the first body. By way of the material recess, a stress reduction in the welding zone can be provided, as a result of which the risk that the welded connection between the two bodies of the centre electrode, which are produced from different materials and accordingly have different heat expansion coefficients, is undone.
    Preferred further developments of the invention are obtained from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail by way of the drawing without being restricted to this. There it shows:
    Fig. 1: a schematised representation of a spark plug according to the invention.
    20195255 prh 01 -04- 2019
    The invention present here relates to a spark plug for an internal combustion engine, in particular for a spark-ignition gas engine, which serves for igniting a fuel mixture to be combusted in the internal combustion engine .
    Fig. 1 shows a schematised extract from a spark plug 10 in the region of a centre electrode 11 and an earth electrode 12 arranged in the radial direction roundabout the centre electrode 11. Between the centre electrode 11 and the earth electrode 12 an annular ignition gap 13 in the form of an annular gap or of a segmented annular gap is formed, which is provided for igniting a fuel mixture by way of an electric ignition spark forming between the centre electrode 11 and the earth electrode 12.
    The centre electrode 11 consists of a first body 14 and a second body 15, which are joined by welding. The first body 14 consists of an electrode base material. The second body 15 consists of a precious metal.
    In order to ensure a good bond between the two bodies 14, 15 of the centre electrode 11 and to reduce the risk that the second body 15 consisting of the precious metal is detached from the first body 14 consisting of the electrode base material, it is provided according to the invention that the first body 14 of the centre electrode 11 has a main body 14a and a projection 14b which with respect to the main body 14a projects in the axial direction A. The second body 15 is formed as an annular element with a central recess 17, into which the projection 14b of the first body 14 extends.
    For joining second body 15 and first body 14, two weld seams 18, 19 are formed. A first weld seam 18 is formed
    20195255 prh 01 -04- 2019 between a radially outer surface 20 of the projection 14b of the first body 14 and a radially inner surface 21 of the second body 15 delimiting the recess 17 of the second body 15. This first weld seam 18 extends seen in the axial direction a emanating from an end face 22 of the centre electrode 11 into the same, wherein a penetration depth of the first weld seam 18 into the centre electrode 11 approximately corresponds to the axial length h of the projection 14b of the first body 14.
    The second weld seam 19 is formed between an axial surface 24 of the main body 14a of the first body 14 and an adjoining axial surface 25 of the second body 15. This second weld seam 19 extends, emanating from a circumferential surface 23 of the centre electrode 11, into the same, wherein the penetration depth of the second weld seam 19 corresponds to the radial distance between the circumferential surface 23 of the centre electrode 11 and the projection 14b of the first body 14.
    The first weld seam 18 extending in the axial direction into the centre electrode 11, which in the circumferential direction runs about the surfaces 20, 21, is offset by approximately 90° or by 90° relative to the second weld seam 19, which is formed between the axial surfaces 24 and 25 and in the radial direction extends into the centre electrode 11.
    Preferentially, the projection 14b of the first body 14 and thus the recess 17 of the second body 15 are contoured in such a manner that the following relationship: d d 8h applies to a diameter d of the projection 14b and the axial length h of the projection 14b.
    Particularly preferably it is provided that into the end face of the projection 14b, which extends in the plane of the end face 22 of the centre electrode 11, a material recess 16 is introduced which is preferentially contoured parabolically.
    For the centre electrode 11 of the spark plug 10 according to the invention there is a reduced risk that the second body 15 of the centre electrode 11 produced from precious metal becomes unintentionally detached from the first body 14 of the centre electrode 11 produced from the electrode base material.
    Each of the weld seams 17, 18 have a relatively low penetration depth but, combined, provide a high weld area that is available, which can be reliably formed.
    By way of the optional material recess 16, stresses in the welding zone can be reduced, as a result of which the risk of a failure of the welded connection can be reduced.
    A further advantage of the spark plug 10 consists in that through the recess 17 in the second body 15 of the centre electrode 11, less precious metal is required. This reduces the production costs of the spark plug 10.
    20195255 prh 01 -04- 2019
    REFERENCE LIST
    Spark plug
    Centre electrode
    Earth electrode
    Ignition gap
    First body
    14a Main body
    14b Projection
    Second body
    Material recess
    Recess
    First weld seam
    Second weld seam
    Radially outer surface
    Radially inner surface
    End face
    Circumferential surface
    Axial surface
    Axial surface
    权利要求:
    Claims (9)
    [1]
    The claims
    A spark plug (10) for an internal combustion engine, the spark plug having a central electrode (11) comprising a first body (14) which
    5 consists of an electrode base material, and a second body (15) consisting of a precious metal welded to the first body (14), a ground electrode (12) arranged radially around the center electrode (11), an annular ignition gap (13) formed in the center electrode (11) )
    10 and a ground electrode (12) for igniting the fuel mixture with an electric ignition spark formed between the center electrode (11) and the ground electrode (12), characterized in that the second body (15) of the center electrode (11) is formed as an annular element with a center recess (17) , the first body (14) of the central electrode (11) comprises a main body (14a) and a protrusion (14b) extending into the recess (17) of the second body (15), a first weld seam (18) is formed on the protrusion (14b) of the first body (14) between the radial outer surface (20) and the radial inner surface (21) of the second body (15) delimiting the recess (17) of the second body (15), a second weld seam (19) is formed on the axial surface of the main body (14a) of the first body (14) 24) and the axial 25 of the second body (15) between its surface (25).
    [2]
    A spark plug according to claim 1, characterized in that the first weld seam (18) and the second weld seam (19) are at an angle of about 90 ° or at an angle of 90 ° to each other.
    [3]
    Spark plug according to Claim 1 or 2, characterized in
    30 in that the first weld seam (18), seen in the axial direction, extends from the end surface (22) of the central electrode (11) to the same.
    [4]
    Spark plug according to Claim 2, characterized in that the penetration depth of the first weld seam (18) corresponds to the axial length (h) of the projection (14b) of the first body (14).
    [5]
    Spark plug according to one of Claims 1 to 4, characterized in that the second weld seam (19), viewed in the radial direction, extends from the circumferential surface (23) of the central electrode (11) to the same.
    [6]
    Spark plug according to Claim 5, characterized in that the penetration depth of the second weld seam (19) corresponds to the radial distance between the circumferential surface (23) of the central electrode (11) and the projection (14b) of the first body (14).
    [7]
    Spark plug according to one of Claims 1 to 6, characterized in that the end side of the projection (14b) of the first body (14) has:
    10 arranged material recesses (16).
    [8]
    Spark plug according to Claim 7, characterized in that the material recess (16) is designed to be parabolic.
    [9]
    Spark plug according to one of Claims 1 to 6, characterized in that the diameter (d) of the projection (14b) and the axial dimension of the projection (14b)
    15 length (h) is dimensioned so that d <8h is realized.
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    同族专利:
    公开号 | 公开日
    DE102018110580A1|2019-11-07|
    CN110445014A|2019-11-12|
    US10490981B1|2019-11-26|
    US20190341748A1|2019-11-07|
    KR20190127555A|2019-11-13|
    JP2019194981A|2019-11-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP3562533B2|1994-08-03|2004-09-08|株式会社デンソー|Spark plug for internal combustion engine|
    AT410151B|2001-06-05|2003-02-25|Jenbacher Ag|SPARK PLUG OF AN INTERNAL COMBUSTION ENGINE|
    US7521849B2|2005-09-29|2009-04-21|Federal-Mogul World Wide, Inc.|Spark plug with welded sleeve on electrode|
    US8044560B2|2007-10-10|2011-10-25|Steigleman Jr Robert Lee|Sparkplug with precision gap|
    DE102011077279A1|2011-06-09|2012-12-13|Robert Bosch Gmbh|Electrode for a spark plug and method for its production|
    DE102012208069A1|2012-05-15|2013-11-21|Man Diesel & Turbo Se|Spark plug for an internal combustion engine|
    JP6023649B2|2013-05-09|2016-11-09|日本特殊陶業株式会社|Spark plug|
    DE102014117714B4|2014-12-02|2016-06-09|Federal-Mogul Ignition Gmbh|Spark plug for a gas-powered internal combustion engine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102018110580.0A|DE102018110580A1|2018-05-03|2018-05-03|Spark plug for an internal combustion engine|
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