• 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, with 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 connected to the first body (14), with an earth electrode (12) that is arranged in the radial direction roundabout the centre electrode (11), with an annular ignition gap (13) formed between the centre electrode (11) and the earth electrode (12) for igniting a fuel mixture via 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 with 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). The second body (15) is positively held on the first body (14) via an undercut formed in the region of the projection (14b) of the first body (14) between the first body (14) and the second body (15).
    公开号:FI20195253A1
    申请号:FI20195253
    申请日:2019-04-01
    公开日:2019-11-04
    发明作者:Björn Dirumdam；Johannes Bär
    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.
    20195253 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 round about 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 connected to one another, in particular 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 formed 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. The second body is positively retained via an undercut formed in the region of the projection of the first body between the first body and the second body.
    20195253 prh 01 -04- 2019
    The invention present here proposes for the first time to positively fix the second body of the centre electrode on the first body of the centre electrode via a mechanical undercut that is formed between these two bodies of the centre electrode. Even upon a failure of a welded connection formed between these two bodies, the second body can be securely retained on the first body in this way. The risk of damage to the internal combustion engine is minimised because of this.
    According to an advantageous further development of the invention, the recess of the second body is contoured funnel-like or conical in the cross section, namely converging emanating from an axial surface of the second body, which in portions defines an end face of the centre electrode, in the direction of an axial surface of the second body, located opposite an axial surface of the main body. The projection of the first body is contoured in the manner of a truncated cone or conical in the cross section, namely diverging emanating from the axial surface of the main body of the first body in the direction of an axial surface of the projection of the first body, which in portions defines the end face of the centre electrode. By way of this, the mechanical undercut can be produced particularly easily and advantageously in order to positively retain the second body on the first body of the centre electrode.
    Preferentially, the projection of the first body is formed within the recess in the second body by forming. By way of this, the undercut can be particularly easily provided.
    20195253 prh 01 -04- 2019
    Preferentially, a first weld seam is formed between an axial surface of the main body of the first body and an axial surface of the second body, which preferentially, seen in the radial direction extends, emanating from a circumferential surface of the centre electrode, into the same. Preferentially, additionally, a second weld seam is formed between a radially outer surface of the project of the first body and a radially inner surface of the second body delimiting the recess of the second body, which preferentially, seen in the axial direction, emanating from an end face of the centre electrode, extends into the same. Preferentially, both weld seams are present. By way of this, an available weld area is increased. Even when both weld seams should fail, the second body is securely retained on the first body via the mechanical undercut.
    Preferentially, a material recess is introduced into the axial surface of the projection of the first body, which in portions defines the end face of the centre electrode. By way of the material recess, a stress reduction in the region of the weld seams can be provided, as a result of which the risk that the weld seams should fail can be reduced.
    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.
    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 .
    20195253 prh 01 -04- 2019
    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.
    20195253 prh 01 -04- 2019
    The centre electrode 11 consists of a first body 14 and a second body 15, which are connected 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. The second body 15 is positively retained on the first body 14 by way of an undercut formed in the region of the projection 14b of the first body 14 between the first body 14 and the second body 15. Should a welded connection, which will be discussed later on and which is formed between the two bodies 14, 15 should fail, the second body 15 is nevertheless captively retained on the first body 14 through the mechanical undercut.
    For providing the mechanical undercut between the two bodies 14, 15 of the centre electrode 11, the recess 17 in the second body 15 is contoured funnel-like or conical in the cross section. The recess 15 in the second body 15 is contoured conically in such a manner that the recess 17 converges, namely emanating from an axial surface 26 of the second body 15, which in portions defines an end face 22 of the centre electrode 11, in the direction of an axial surface 25 of the
    20195253 prh 01 -04- 2019 second body 15, which is located opposite an axial surface 24 of the main body 14a of the centre electrode 11.
    The projection 14b of the first body 14, which extends into this recess 17 in the second body 15 of the centre electrode 11 is contoured in the manner of a truncated cone in the cross section or conically, namely in such a manner that the same diverges, namely emanating from the axial surface 24 of the main body 14a of the first body 14 of the centre electrode 11 in the direction of an axial surface 27 of the projection 14b of the body 15, which together with the axial surface 26 of the second body 15 defines the end face 22 of the centre electrode 11.
    The projection 14b of the first body 14, which together with the recess 17 of the second body 15 forms the mechanical undercut is created by forming within the recess 17. Accordingly, Fig. 1 shows in dashed lines a cylindrical projection 14b' of the first body 14 of the centre electrode 11, which extends into the recess 17 in the second body 15 of the centre electrode 11 and relative to the axial surface 26 of the second body 15, which in portions defines the end face 22 of the centre electrode 11, projects in the axial direction A. In the radial direction, there is a significant clearance between this cylindrical projection 14b' and the conically contoured recess 17 of the second body 15.
    By forming the cylindrical projection 14b', namely by plastically forming the same, the same can be transferred into the figure contoured in the manner of a truncated cone or conical in the cross section, namely subject to forming the projection 14b, which together with the recess 17 in the second body 15 provides the mechanical undercut for the positive fixing of the second body 15 on the first body 14.
    To additionally connect the second body 15 and the first body 14 in a firmly bonded manner, two weld seams 18, 19 are preferentially formed.
    A weld seam 18 is formed between a radially outer surface 20 of the projection 14b of the first body 14 which is contoured in the manner of a truncated cone and a radially inner surface 21 of the second body 15 which is contoured funnel-like and which delimits the recess 17 of the second body 15. This weld seam 18, seen in the axial direction A, extends emanating from the end face 22 of the centre electrode 11 into the same, wherein a penetration depth of this weld seam 18 into the centre electrode 11 approximately corresponds to the axial length h of the formed projection 14b of the first body 14.
    20195253 prh 01 -04- 2019
    A weld seam 19 is formed between the axial surface 24 of the main body 14a of the first body 14 and the adjoining axial surface 25 of the second body 15. Emanating from a circumferential surface 23 of the centre electrode 11, this weld seam 19 extends into the same, wherein the penetration depth of this 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 weld seams 18, 19 each have a relative low penetration depth but, combined, provide a high available weld area which can be reliably formed. If only a single weld seam is present, this should preferentially be the weld seam 19.
    Particularly preferably it is provided that in the axial surface 27 of the projection 14b of the first body 14, which in portions defines the end portions 22 of the centre electrode 11, a material recess 16 is introduced, which is preferentially contoured parabolically. 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.
    There is a reduced risk for the centre electrode 11 of the spark plug 10 according to the invention that the second body 15 of the centre electrode 11 produced from precious metal, unintentionally is detached from the first body 14 of the centre electrode 11 produced from the electrode base material. A further advantage of the spark plug 10 consists in that because of the recess 17 in the second body 15 of the centre electrode 11, less precious metal is needed. This reduces the production costs of the spark plug 10.
    20195253 prh 01 -04- 2019 σ>
    CM tr
    CO LO CM LO σ>
    CM
    - 9 REFERENCE LIST
    Spark plug
    Centre electrode
    Earth electrode
    Ignition gap
    First body
    Main body
    14b' Projection
    Second body
    Material recess
    Recess
    Second weld seam
    First weld seam
    Radially outer surface
    Radially inner surface End face
    Circumferential surface
    Axial surface
    Axial surface
    Axial surface
    Axial surface
    权利要求:
    Claims (10)
    [1]
    The claims
    A spark plug (10) for an internal combustion engine, the spark plug having a center electrode (11) comprising a first body (14) consisting 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) disposed radially around the center electrode (11), an annular ignition gap (13) formed between the center electrode (11) 10 and the ground electrode (12) to ignite a fuel mixture with an electric ignition spark formed by the center electrode (11) and the center electrode (11) characterized in that the second body (15) of the central electrode (11) is formed as an annular element with a central 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), the second body (15) being held in place in the first body (14) for undercutting formed in the region of the protrusion (14b) of the first body (14) between the first body (14) and the second body (15).
    [2]
    Spark plug according to Claim 1, characterized in that the recess (17) in the second body (15) is shaped in cross-section.
    25 funnel-shaped or conical, namely tapering from the axial surface (26) of the second body (15), which partially defines the end surface (22) of the central electrode (11) in the direction of the axial surface (25) of the second body (15) opposite the main body (14a) axial surface (24).
    [3]
    Spark plug according to Claim 1 or 2, characterized in that the projection (14b) of the first body (14) is shaped like a truncated cone in cross section or extends conically from the axial surface (24a) of the main body (14a) of the first body (14a). (14) in the direction of the end surface (27) of the protrusion (14b), which partially defines the end surface (22) of the center electrode (11).
    20195253 prh 01 -04- 2019
    [4]
    Spark plug according to one of Claims 1 to 3, characterized in that the projection (14b) of the first body (14) is formed by shaping it inside the recess (17) of the second body (15).
    [5]
    Spark plug according to one of Claims 1 to 4, characterized in that
    5 characterized in that a first weld seam (19) is formed between the axial surface (24) of the main body (14a) of the first body (14) and the axial surface (25) of the second body (15), the weld seam extending radially from the center electrode (11) from the circumferential surface (23) to the same.
    [6]
    Spark plug according to one of Claims 1 to 5, characterized in that
    10 characterized in that a second weld seam (18) is formed between the radial outer surface (20) of the protrusion (14b) of the first body (14) and the radial inner surface (21) of the second body (15) delimiting the projection (17) of the second body (15) , which weld, seen in the axial direction, extends from the end surface (22) of the central electrode (11) to the same.
    15
    [7]
    Spark plug according to Claim 5 or 6, characterized in that the penetration depth of the second weld seam (18) corresponds to the axial length (h) of the projection (14b) of the first body (14).
    [8]
    Spark plug according to one of Claims 5 to 7, characterized in that the penetration depth of the first weld (19) corresponds to
    20 the radial distance between the circumferential surface (23) of the central electrode (11) and the protrusion (14b) of the first body (14).
    [9]
    Spark plug according to one of Claims 3 to 8, characterized in that the axial surface (27) of the projection (14b) of the first body (14), which partially defines the end surface (22) of the central electrode (11), is
    25 arranged material recesses (16).
    [10]
    Spark plug according to Claim 9, characterized in that the material recess (16) is designed to be parabolic.
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    同族专利:
    公开号 | 公开日
    JP2019194984A|2019-11-07|
    US10637213B2|2020-04-28|
    DE102018110571A1|2019-11-07|
    US20190341747A1|2019-11-07|
    CN110445015A|2019-11-12|
    KR20190127569A|2019-11-13|
    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102018110571.1A|DE102018110571A1|2018-05-03|2018-05-03|Spark plug for an internal combustion engine|
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