EP3247942B1 - Glühkerze mit lastsensor und geschweisster flexibler distaler membran mit transversalem flexiblem kragen - Google Patents

Glühkerze mit lastsensor und geschweisster flexibler distaler membran mit transversalem flexiblem kragen Download PDF

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Publication number
EP3247942B1
EP3247942B1 EP16707746.0A EP16707746A EP3247942B1 EP 3247942 B1 EP3247942 B1 EP 3247942B1 EP 16707746 A EP16707746 A EP 16707746A EP 3247942 B1 EP3247942 B1 EP 3247942B1
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EP
European Patent Office
Prior art keywords
extremity
heating rod
proximal
axial
distal
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EP16707746.0A
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English (en)
French (fr)
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EP3247942A1 (de
Inventor
Alain Ramond
Gverino Ratosa
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SIEVA d o o PE SPODNJA IDRIJA
Sieva doo PE Spodnja Idrija
Original Assignee
SIEVA d o o PE SPODNJA IDRIJA
Sieva doo PE Spodnja Idrija
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Publication of EP3247942A1 publication Critical patent/EP3247942A1/de
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Publication of EP3247942B1 publication Critical patent/EP3247942B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F23Q2007/002—Glowing plugs for internal-combustion engines with sensing means

Definitions

  • the invention relates to a glow plug, especially for a diesel engine, comprising a heating rod and an integrated load sensor allowing cylinder pressure measurements to be carried out, in particular for real time control of the engine.
  • a heating rod of a glow plug is in the form of a rigid rod or bar which extends axially from the body of the plug into the combustion chamber.
  • distal and its derivatives denote directions, elements or parts that are situated axially on the side of the free extremity of the heating rod which is to extend into the combustion chamber
  • proximal and its derivatives denote directions, elements or parts that are situated axially on the opposite side, that is to say towards the connection to the outside of the cylinder head of the engine on which the glow plug is to be mounted.
  • a heating rod extends towards the proximal side into the plug body and has a proximal extremity provided with an electrical connection forming a first electrical power supply terminal of the heating rod, generally with an electrode which extends axially beyond the proximal extremity of the heating rod.
  • a power supply electrode of a heating rod where provided, is not considered to form an integral part of the heating rod itself.
  • the plug includes a cylindrical plug body having a threaded external portion for fitting on a cylinder head, and forming a cylindrical internal housing for receiving the proximal portion of the heating rod extending towards said proximal extremity, said housing having an opening for the passage of the heating rod such that the latter extends axially, projecting (on the distal side) beyond said proximal portion and the opening, and having a heating distal portion as far as the distal extremity of the heating rod.
  • the heating rod is either in the form of a ceramic bar which has been machined to shape and set (fixed by brazing or inserted by force (bracing)) into an external metal tube for mounting in the plug body; or in the form of a metal tube which is closed at its distal extremity and is of invariable standardized dimensions (this metal tube receiving an electrical power supply electrode). Whatever the form, the heating rod therefore always comprises an external metal tube.
  • the outer diameter of this external metal tube is, in the proximal portion of the heating rod extending into the plug body, at least substantially constant, and according to the standards must be equal to 4 mm.
  • WO 2014/122958 discloses a glow plug, comprising:
  • EP2469169 and EP2472181 describe a glow plug having a load sensing sleeve surrounding the heating rod in the receiving housing of the plug body, and a mounting bush for mounting the proximal portion of the heating rod in the receiving housing, the mounting bush comprising:
  • Such a glow plug comprising a mounting bush with a flexible membrane turned up in a U- or J-shape is satisfactory, especially with regard to the previous solutions mentioned in EP2469169 . It makes it possible in particular to obtain cylinder pressure measurements which are as good as those of dedicated laboratory sensors which are controlled in terms of temperature and can be mounted in place of a plug on an engine being tested in a laboratory. Nevertheless, the inventors have found, surprisingly, that it is in fact possible to improve the mounting still further.
  • the signal supplied by the load sensing sleeve exhibits a slight lack of linearity in the form of a depression (called "undershoot") following each pressure pulse. Although this systematic and repetitive defect can easily be compensated by electronic processing of the signal, it is desirable to eliminate it without, however, damaging the advantages resulting from the mounting device set out in EP2469169 and EP2472181 .
  • the invention therefore aims to overcome those disadvantages by proposing a glow plug with which the depression defect ("undershoot") after a pressure pulse in the signals supplied by the load sensing sleeve is reduced and substantially eliminated, and which additionally have the advantages of the plugs according to EP2469169 and EP2472181 , especially with regard to the mechanical and thermal characteristics of the mounting -especially of the flexible membrane-, the possibility of mounting by inserting the heating rod by its proximal extremity into the mounting bush, the sensitivity of the sensor and its robustness towards thermal phenomena, the reliability and lifetime of the plug, and the possibilities of certification.
  • the invention relates to a glow plug according to claim 1.
  • said flexible collar is of constant axial thickness (that is to say which is the same throughout its extension in the radial direction, the collar having the general shape of a flat washer).
  • the flexible membrane is welded to a distal extremity of the fixing ring, and an axial space is formed between the flexible collar and the distal portion of the fixing ring, for example by an internal bevel of that distal portion of the fixing ring, so as to allow the collar to deform in flexion in the proximal direction.
  • the flexible membrane also comprises an annular linking reinforcement which extends radially towards the exterior in a prolongation of the collar and is welded to said fixing ring to form said radial extremity portion.
  • the annular linking reinforcement extends axially in the distal direction starting from and beyond the collar in the distal direction, that is to say the annular linking reinforcement has an axial thickness which is greater than the axial thickness of said collar. In those embodiments, the annular linking reinforcement extends in the distal direction beyond said collar.
  • the annular linking reinforcement may extend axially in the proximal direction starting from the periphery of the collar towards said fixing ring, forming a turned-up portion of the membrane.
  • the annular linking reinforcement has an axial thickness which is greater than the axial thickness of said flexible collar.
  • the flexible collar formed by the flexible membrane is, however, orthogonal to the receiving sleeve, and therefore also to the heating rod and to its principal axis. It therefore constitutes a portion which is transversal, flat and in particular without curvature except for the flared portion described herein below for connection to the body of the receiving sleeve, and the annular linking reinforcement for connection to the fixing ring.
  • the annular linking reinforcement has a proximal radial face welded to a distal extremity of said fixing ring -especially to a distal radial face of said fixing ring-.
  • This method of fixing is particularly simple and effective. However, there is nothing to prevent the annular linking reinforcement, in a variant, from being welded in a recess formed at the external periphery of the distal extremity of said fixing ring.
  • the annular linking reinforcement has a radial thickness greater than the axial thickness of said collar.
  • the annular linking reinforcement forms a distal peripheral portion of the membrane, ensuring optimum assembly of the membrane to said fixing ring, especially in the embodiments where the annular linking reinforcement has a proximal radial face welded to the distal extremity of the fixing ring.
  • the proximal radial face of the annular linking reinforcement and the distal extremity of said fixing ring being in contact to each other according to a facing radial thickness, the proximal radial face of the annular linking reinforcement is welded to the distal extremity of said fixing ring over the whole of their facing radial thickness. Accordingly, the junction of the proximal radial face of the annular linking reinforcement and the distal extremity of said fixing ring does not have any non-welded contact surface between those two elements, which could be liable to cause disturbances (linearity defects) in the signals supplied by the load sensing sleeve.
  • the annular linking reinforcement preferably has a radial thickness which is greater than or equal to the radial thickness of said distal extremity face of said fixing ring to which it is welded.
  • the annular linking reinforcement extends radially so as to have a peripheral contact face in contact with an internal face of the receiving housing. It is to be noted that this close contact without radial gap avoids the insertion of calamine between the annular linking reinforcement and this internal face.
  • a large radial thickness of the annular linking reinforcement allows its deformations to be minimized, and contact with the internal face of the receiving housing to be maintained.
  • Said peripheral contact face of the annular linking reinforcement has shapes and dimensions which are conjugate with those of said internal face of the receiving housing, in particular and preferably cylindrical in revolution.
  • Said peripheral contact face of the annular linking reinforcement constitutes a portion of the annular linking reinforcement and of the flexible membrane which, in the receiving housing, is situated furthest towards the exterior radially.
  • the annular linking reinforcement has a distal extremity face which has a junction with said peripheral contact face, said distal extremity face extending, at that junction, radially orthogonally to said peripheral contact face. Furthermore, at that junction, said distal extremity face also extends radially orthogonal to said internal face of the receiving housing.
  • said distal extremity face extending radially in a non-orthogonal direction and/or at least partially curved.
  • said peripheral contact face of the annular linking reinforcement is welded to said internal face of the receiving housing by at least one peripheral weld -especially at said junction-.
  • a weld in addition to the weld of the radial extremity portion of the collar to said fixing ring (which is itself welded to the internal face of the receiving housing), avoids separation of said peripheral contact face of the annular linking reinforcement relative to said internal face of the receiving housing.
  • said collar is connected to the distal extremity of the body of the receiving sleeve by a curved flared portion with continuous curvature having a concavity oriented towards the proximal extremity of the heating rod.
  • the curvature of this flared portion remains in the same direction with the concavity oriented in the proximal direction along the flared portion.
  • this curvature is preferably constant (as an arc of a circle), but any other form is possible.
  • said curved flared portion is welded to the heating rod at a junction zone of said curved flared portion with the heating rod. Undesired separation of the distal extremity of the receiving sleeve relative to the heating rod during deformation of the flexible membrane is thus avoided. The deformations of the flexible membrane are thus only flexion deformations of the flared portion and/or of the collar.
  • said curved flared portion has an external radius of curvature of less than 0.5 mm -in particular between 0.1 mm and 0.3 mm-. Other values are possible.
  • the radial thickness of the receiving sleeve is determined according to criteria which are different than the ones used for determining for the thickness of the flexible membrane.
  • the body of the receiving sleeve is formed of a cylindrical wall having a smaller radial thickness in a distal portion of this cylindrical wall, said distal portion extending at the distal extremity of the body of the receiving sleeve.
  • said collar has an axial thickness of the same order as the radial thickness of said distal portion - in particular identical to that radial thickness-. The same is true of the flared portion.
  • the distal portion and the collar have a radial thickness of less than 0.5 mm - in particular between 0.2 mm and 0.5 mm-, for example of the order of 0.4 mm.
  • the receiving sleeve has a constant thickness from its proximal extremity to the distal portion.
  • the distal portion extends over an axial length which is, for example, between 0.5 mm and 5 mm, in particular of the order of 1 mm. Other values are possible.
  • the invention is, moreover, as compatible with a heating rod in the form of a ceramic bar as with a heating rod in the form of a metal tube.
  • the receiving sleeve is placed around a peripheral metal tube of said proximal portion of the heating rod, the peripheral metal tube extending axially also into said proximal zone of the receiving housing.
  • the heating rod is formed substantially of a metal tube, and said receiving sleeve extends around the proximal portion of the metal tube.
  • the heating rod is formed of a ceramic bar set in at least one external metal tube, said receiving sleeve extends around a proximal portion of such an external metal tube of the heating rod.
  • a heating rod whose external surface inserted in the receiving sleeve is not metal but formed of ceramic material.
  • a plug according to the invention is advantageously further characterized in combination by all or some of the characteristics described by EP2469169 and/or EP2472181 .
  • the tubular load sensor immediately axially adjoins a proximal axial extremity of the receiving sleeve opposite said distal extremity of the receiving sleeve.
  • the fixing ring simultaneously permits good guiding of the receiving sleeve, good fixing of the flexible membrane and of the whole inside the receiving housing of the plug body, perfect impermeability with respect to the corrosive atmosphere of the combustion chamber, and optimization of the heat transfers between the heating rod and the plug body on the one hand via the flexible membrane and on the other hand by radial thermal conduction between the two fixing faces, which preferably face one another radially.
  • the load sensor which can advantageously be in the form of a tubular sleeve provided with sensitive piezoelectric elements.
  • This load sensing sleeve can be mounted with a distal extremity fixed to a proximal extremity of the receiving sleeve, and with a proximal extremity fixed to a proximal extremity of the fixing ring, especially via an external linking tube.
  • Mounting of a plug according to the invention can be carried out by axial insertion in the proximal direction of the proximal extremity of the heating rod into the receiving sleeve of the mounting bush, and then, after execution of each weld of the receiving sleeve to the heating rod, by axial insertion in the distal direction of the fixing ring around the receiving sleeve, and then, after execution of the weld between the fixing ring and the flexible membrane, by axial insertion in the distal direction of the load sensing sleeve around the proximal extremity of the heating rod against the mounting bush.
  • a plug according to the invention is characterized by at least one of the following features:
  • the invention also concerns a glow plug, which is characterized in combination by all or some of the characteristics mentioned above or below.
  • a glow plug according to the invention includes a heating rod 11 which, in the example of Fig. 1 , is of the so-called all-metal type, consisting essentially of a metal tube 59.
  • This metal tube 59 is thus a metal tube which can be called peripheral, and receives an electrical power supply electrode 12 (which is not considered to form an integral part of the heating rod itself), so that power can be supplied to it by a current which is capable of heating at least one electrical resistance 69 which is connected to the distal extremity of the electrode 12 within the metal tube 59, and capable of generating (by Joule effect) heating of the distal extremity of the heating rod 11.
  • the electrode 12 extends into the metal tube 59, on a certain length of the latter, and is insulated from it by an inserted insulating material 64.
  • the electrode 12 extends axially in a projection beyond the proximal extremity 38 of the heating rod 11.
  • the electrode 12 has a proximal extremity which is connected to an electrical power supply connector 98.
  • This heating rod 11 is received in a plug body 13, which for this purpose forms a receiving housing 14.
  • the heating rod 11 extends longitudinally according to a principal axis 41, which is also an axis of the plug body 13, of the receiving housing 14, and of a threaded portion 43 of the external wall 42 of the plug body 13, said threaded portion being configured and intended to make it possible to fix the glow plug in an internally threaded hole which passes through the cylinder head of an engine.
  • a principal axis 41 which is also an axis of the plug body 13, of the receiving housing 14, and of a threaded portion 43 of the external wall 42 of the plug body 13, said threaded portion being configured and intended to make it possible to fix the glow plug in an internally threaded hole which passes through the cylinder head of an engine.
  • the plug body 13, its external wall 42, the receiving housing 14 and the internal wall 44 of the plug body 13, which delimits the receiving housing 14, is preferably rotationally symmetrical around the principal axis 41, but any other form which does not conform to such a symmetry of revolution is equally conceivable. That being so, the plug body 13, in its distal portion forming the receiving housing 14, is in the form of a tube 45, the internal wall 44 of which is cylindrical (rotationally symmetrical or not, i.e. its base is not necessarily circular) relative to the principal axis 41.
  • This tube 45 has a distal extremity 46, which is closed by a truncated washer 47, which forms the distal extremity of the plug body 13.
  • the receiving housing 14 thus extends from the truncated washer 47 axially in the proximal direction.
  • the heating rod 11 extends axially in the distal direction beyond the plug body 13 and the washer 47, through the central opening of the latter, and has a distal portion 49 which is designed to extend into the atmosphere of the combustion chamber of an engine.
  • the heating rod 11 also has a proximal portion 50, which extends into the receiving housing 14.
  • the receiving housing 14 contains a mounting bush 48 of the heating rod 11.
  • the function of this mounting bush 48 is to fix the heating rod 11 solidly relative to the plug body 13, while making slight axial translation movements of the heating rod 11 relative to the plug body 13 possible, under the effect of variations of the pressure of the atmosphere of the combustion chamber.
  • the mounting bush 48 also includes sealing means 15, 16, ensuring impermeability between the heating rod 11 and the plug body 13, in such a way as to delimit a proximal zone 51, which is not exposed to the atmosphere of the combustion chamber, of the receiving housing 14.
  • the mounting bush 48 includes a fixing ring 15, which is cylindrical overall and has an external cylindrical wall 19, which faces radially towards the exterior and is fixed rigidly and impermeably to the internal wall 44 (which faces radially towards the interior) of the tube 45 delimiting the receiving housing 14, in particular by at least one peripheral weld 21, which can be implemented by laser through the thickness of the tube 45.
  • the external wall 19 of the fixing ring 15 thus forms a first fixing face of the mounting bush 48, to the facing internal wall 44 of the tube 45.
  • the fixing ring 15 is fixed to the internal wall 44 of the tube 45 (plug body 13) by only one peripheral weld 21, so that any deformation of the plug body 13 (due to thermal and/or pressure variations) does not produce stresses or deformations in said fixing ring.
  • the fixing ring 15 has an internal cylindrical wall 20, which forms a hole which axially extends through the fixing ring 15.
  • the internal diameter of this internal wall 20 of the fixing ring 15 is greater than the peripheral outer diameter of the proximal portion 50 of the heating rod 11 facing it, so as to provide for a radial space allowing the insertion of a receiving sleeve 16 between the fixing ring 15 and the proximal portion 50 of the heating rod 11.
  • the receiving sleeve 16 has a tubular principal body 60 in the form of a fine metal tube.
  • This fine metal tube is preferably of stainless steel with high characteristics, in particular having a Young's modulus greater than 150 GPa, in particular of the order of 200 GPa, an elastic limit greater than 600 MPa, e.g. of the order of 800 MPa, and a fatigue strength (maximum stress for which the number of cycles is infinite) of at least 300 MPa, e.g. of the order of 400 MPa.
  • it is of 17-4PH steel or inconel steel.
  • the tubular body 60 of the receiving sleeve 16 has an internal cylindrical wall 22 (facing radially towards the interior), the internal diameter of which corresponds to that of the proximal portion 50 of the heating rod 11 (in particular typically of 4 mm according to the standards in force), so as to be in contact with this proximal portion 50 and fixed rigidly and impermeably to the latter by at least one peripheral weld 23 (in particular two peripheral welds 23a, 23b in the example shown in Fig. 1 ).
  • the internal wall 22 of the receiving sleeve 16, which is fixed rigidly and impermeably around the proximal portion 50 of the heating rod 11, thus forms a second face 22 for fixing the mounting bush 48 on the heating rod 11.
  • the tubular body 60 of the receiving sleeve 16 has a peripheral cylindrical wall 52 which faces radially towards the exterior, i.e. facing the internal wall 20 of the fixing ring 15. A very small gap - in particular of the order of 0.2 mm - is created radially between these cylindrical facing walls 52, 20, so as to make axial translation movements of the receiving sleeve 16 relative to the fixing ring 15 possible.
  • the receiving sleeve 16 has a flexible distal membrane which is fixed rigidly and impermeably at least to the distal extremity 25 of the receiving ring 15.
  • the flexible distal membrane is an extension of the tubular body 60 of the receiving sleeve 16, at a distal extremity 24 thereof.
  • Said flexible membrane comprises a flexible collar 26 which extends radially orthogonally relative to the body 60 of the receiving sleeve.
  • Said collar 26 is flat (in the form of a flat washer), with a constant axial thickness over the whole of its radial extent. It is prolonged radially by an annular linking reinforcement 58 which:
  • the flexible membrane is thus welded to said fixing ring 15 at least by the annular reinforcement 58, which constitutes a radial extremity portion of the flexible membrane welded to the fixing ring 15. In this way, any deformation of the plug body 13 (due to thermal and/or pressure variations) does not produce stresses or deformations in the flexible membrane.
  • the flexible membrane is thus isolated from such deformations of the plug body 13 by the fixing ring 15, which has a greater inertia and is preferably fixed to the plug body 13 by only one welding line, as above mentioned.
  • the annular reinforcement 58 is welded to the distal extremity 25 of the fixing ring 15 by a weld 39 between a proximal (that is to say oriented in the proximal direction) radial face 61 of the annular reinforcement 58 and a distal (that is to say oriented in the distal direction) radial face 62 of the distal extremity 25 of the fixing ring 15.
  • the weld 39 extends radially over the whole of the contact surface between the facing radial faces 61, 62, so that there is no contact or gap without welding between those facing radial faces 61, 62 welded to one another over the whole of their common surface. This has the result in particular that the signal is not disturbed by the variation of a gap between those pieces under pressure variations, and remains representative of the pressure values.
  • the annular reinforcement 58 has a radial thickness which is slightly greater than the radial thickness of the distal radial face 62 of the extremity 25 of the fixing ring 15, that is to say which extends radially towards the interior slightly beyond that distal radial face 62.
  • the proximal radial face 61 of the annular reinforcement 58 extends radially in a prolongation of the proximal radial face of the flexible collar 26, that is to say it constitutes a radial extension thereof.
  • the flexible collar 26 is connected to the distal extremity 24 of the body 60 of the receiving sleeve 16 by a curved flared portion 40 with continuous curvature and whose concavity is oriented towards the proximal extremity 38 of the heating rod 11.
  • this continuous curvature is an arc of a circle, but there is nothing to prevent other forms from being provided.
  • This curved flared portion 40 has an external radius of curvature (concavity side) of preferably less than 0.5 mm -especially between 0.1 mm and 0.3 mm-. It thus forms a linking fillet between the proximal radial face of the flexible collar 26 and the peripheral cylindrical face of the body 60 of the receiving sleeve 16.
  • the distal extremity 25 of the fixing ring 15 additionally has an internal bevel 63 which extends radially towards the interior and in the proximal direction starting from the distal radial face 62 so as to form an axial space 65 between the flexible collar 26 and the distal portion of the fixing ring 15, which axial space 65 allows the collar 26 to deform in flexion in the proximal direction as required.
  • the flared portion 40, the collar 26 and the annular reinforcement 58 are formed by an extension of the body 60 of the receiving sleeve 16.
  • the flared portion 40, the collar 26, the annular reinforcement the body 60 are thus formed in one piece, which can be obtained by stamping and machining a metal tube.
  • the tubular body 60 of the receiving sleeve 16 is formed of a cylindrical wall having a constant radial thickness over the whole of its length, apart from a distal portion 66 having a smaller thickness at the distal extremity of the body 60 of the receiving sleeve 16.
  • a peripheral recess 71 is formed radially towards the interior starting from the external cylindrical peripheral face of the cylindrical wall forming the body 60.
  • the flexible collar 26 and the flared portion 40 advantageously have an axial thickness of the same order as the radial thickness of that distal portion 66.
  • the collar 26 and the flared portion 40 are advantageously formed by stamping the tube constituting the tubular body 60 after machining thereof to form said recess 71. This smaller thickness allows the flexibility of the flexible collar 26 and of the flared portion 40, and therefore that of the flexible membrane, to be adjusted.
  • the annular reinforcement 58 has a radial thickness which is greater than the axial thickness of the flexible collar 26. It is in the general form of a cylindrical ring which extends beyond the axial thickness of the collar 26 in the distal direction and has an external cylindrical face 67, an internal cylindrical face 68 and radial distal extremity face 70.
  • the external cylindrical face 67 of the annular reinforcement 58 constitutes a peripheral face which comes into contact with the internal face 44 of the receiving housing 14. Because the distal extremity face 70 of the annular reinforcement 58 is radial, it is orthogonal to the external cylindrical face 67 at their junction (formed by a circular edge).
  • the internal diameter of the receiving sleeve 16 being of the order of 4 mm
  • the thickness of the distal portion 66, of the flared portion 40 and of the flexible collar 26 is between 0.1 and 0.3 mm, in particular of the order of 0.2 mm
  • the thickness of the cylindrical wall forming the body 60 of the receiving sleeve 16 is between 0.2 mm and 0.5 mm, in particular of the order of 0.35 mm.
  • the flexible collar 26 extends radially over a distance of between 0.5 mm and 2 mm, in particular of the order of 1 mm (distance considered between the internal cylindrical face of the body 60 of the receiving sleeve 16 and the internal cylindrical face of the annular reinforcement 58).
  • the annular reinforcement 58 has a radial thickness and an axial thickness of between 0.4 mm and 1 mm, in particular of the order of 0.6 mm. Other values are possible.
  • the fixing ring 15 is welded to the tube 45 forming the plug body 13 by a weld 21 which passes through the thickness of the tube 45.
  • the receiving sleeve 16 is welded to the heating rod 11 by a weld 23 which passes through the thickness of the body 60 of the receiving sleeve 16, offset slightly towards it proximal extremity 27.
  • the flexible membrane is welded to the fixing ring 15 by a weld 39 between the annular reinforcement 58 and the distal extremity of the fixing ring 15. This weld 39 radially extends over the whole of the axially facing surfaces of the annular reinforcement 58 and of the distal extremity of the fixing ring 15.
  • the variant of Figure 5 differs from the preceding variant in that the receiving sleeve 16 is welded to the heating rod 11 by a first weld 23a, which is similar to the weld 23 of the variant of Figure 4 , and by a second weld 23b, which is located at the junction of the flared portion 40 with the heating rod 11, that is to say at the distal extremity of the tubular body 60, the second weld 23b passing through the thickness of the distal portion 66 of the tubular body 60.
  • a first weld 23a which is similar to the weld 23 of the variant of Figure 4
  • a second weld 23b which is located at the junction of the flared portion 40 with the heating rod 11, that is to say at the distal extremity of the tubular body 60, the second weld 23b passing through the thickness of the distal portion 66 of the tubular body 60.
  • the variant of Figure 6 differs from the preceding variant in that said peripheral contact face 67 of the annular linking reinforcement 58 is welded to said internal face 44 of the receiving housing 14 by a peripheral weld 57 which, in the example shown, is situated at the junction of the peripheral contact face 67 of the annular reinforcement 58 with its distal extremity face 70.
  • This weld 57 especially avoids undesired separation of the peripheral face 67 of the annular reinforcement 58 relative to the internal face 44 of the plug body 13.
  • the flexible collar 26 forms an extremity portion of the receiving sleeve 16 having elasticity in flexion, and thus allowing axial translation movements of the heating rod 11 relative to the fixing ring 15 (and thus relative to the plug body 13) in a sufficiently large amplitude range, and with elastic retraction of the heating rod in axial translation according to a predetermined stiffness coefficient K1, which can be adjusted to a relatively low value by an appropriate choice of the material forming the receiving sleeve 16 and its thickness.
  • the receiving sleeve 16, including the flexible collar 26 has approximately constant thickness.
  • the flexible collar 26 of the distal extremity of the receiving sleeve 16 has numerous advantages.
  • such a flexible collar 26 can be manufactured simply by pressing. It makes it possible to insert the receiving sleeve via the proximal extremity of the heating rod 11, with no risk of damaging the latter.
  • the stresses within the flexible collar 26 are at their maximum value on the proximal side, which is not exposed to the corrosive atmosphere of the combustion chamber.
  • relatively large thickness, in particular of the order of 0.2 mm a relatively low coefficient of elasticity is obtained, making relatively large movements of the heating rod 11 possible.
  • the tubular body 60 of the receiving sleeve 16 passes axially throughout the length of the fixing ring 15, and extends slightly beyond the proximal extremity 28 of the latter.
  • the cylindrical walls 52, 20 facing each other, and the small gap (typically of the order of 0.2 mm) which separates them, as well as the materials forming the receiving sleeve 16 and the fixing ring 15, which are metallic and thermally conductive, facilitate thermal exchanges between the proximal portion 50 of the heating rod 11 and the plug body 13 radially, at the level of the receiving sleeve 16 and the fixing ring 15.
  • a radial thermal bridge is thus implemented by the receiving sleeve 16 and the fixing ring 15.
  • the result is that the elements in the receiving housing 14, beyond the receiving sleeve 16 and the fixing ring 15 of the proximal side, including the load sensing sleeve 17 described below, are less exposed to the high temperatures of the heating rod 11 and the combustion chamber.
  • the proximal extremity 27 of the receiving sleeve 16 comes into contact with a distal extremity 32 of a load sensing sleeve 17, which is tubular overall, and extends axially, in prolongation of the receiving sleeve 16, entirely around the proximal portion 50 (of greater diameter, equal to 4 mm) of the metal tube 59 of the heating rod 11.
  • the load sensing sleeve 17 has symmetry of revolution around the axis 41, and is coaxial to the heating rod 11 and the receiving housing 14.
  • the load sensing sleeve 17 adjoins, axially and directly, the mounting bush 48 on the proximal side thereof.
  • the load sensing sleeve 17 can be made as described in EP2472181 .
  • the load sensing sleeve 17 :
  • the load sensing sleeve 17 comprises a first axial extremity, which is connected rigidly to the heating rod 11 -more precisely to the metal tube 59 of the heating rod 11- via the receiving sleeve 16.
  • this first axial extremity is the distal extremity 32 of the load sensing sleeve 17, axially opposite said proximal extremity 38 of the heating rod 11
  • This first axial extremity 32 is fixed to said peripheral metal tube 59 of the proximal portion of the heating rod.
  • This first axial extremity 32 is thus driven in axial translation by the movements of the heating rod 11 according to the axis 41, at least in the proximal direction, and, in the shown embodiments, in both directions.
  • the load sensing sleeve 17 also comprises a second axial extremity, opposite the first axial extremity, this second axial extremity being connected to the plug body in such a way that axial translation movements of the heating rod 11 relative to the plug body generate axial compression and/or traction stresses in said load sensing sleeve17.
  • this second axial extremity is a proximal extremity 37 of the load sensing sleeve 17, and is linked to said fixing ring 15.
  • a fine metal linking tube 18 extends around the load sensing sleeve 17 from a proximal ring 36 thereof, and on the distal side as far as the fixing ring 15.
  • the proximal ring 36 has a proximal extremity which is the proximal extremity 37 of the load sensing sleeve 17. This linking tube 18 is thus interposed between the load sensing sleeve 17 and the internal wall 44 of the receiving housing 14.
  • the linking tube 18 has a proximal extremity 30 which is fixed rigidly to the proximal ring 36 of the load sensing sleeve 17 by at least one peripheral weld 54, and a distal extremity 29 which is fixed rigidly by at least one peripheral weld 55 to the proximal extremity 28 of the fixing ring 15, preferably in a recess which is made in the wall of the latter and faces radially towards the exterior to avoid any excess thickness.
  • a radial gap is made between the washers of the load sensing sleeve 17 and the linking tube 18.
  • the linking tube 18 is sufficiently fine for a radial gap to be made throughout its axial length, between its cylindrical wall facing the exterior radially and the internal wall 44 of the receiving housing 14 of the plug body 13 facing it. In this way, the linking tube 18 does not come into contact with the plug body 13.
  • the linking tube 18 thus connects the proximal extremity 37 of the load sensing sleeve 17 to the fixing ring 15, and thus to the plug body 13. But since this link transfers the point of support of the proximal extremity 37 of the load sensing sleeve 17 to the fixing ring 15, the compression stresses which are generated in the load sensing sleeve 17 are in fact representative of the shear loads, which are generated by the axial movements of the heating rod 11, between the proximal portion 50 of the heating rod 11 in contact with the receiving sleeve 16 and the fixing ring 15.
  • the two axial extremities of the load sensing sleeve 17 rest respectively on the heating rod 11 (more precisely on the metal tube 59 of the heating rod 11) and on the plug body 13, in zones which at least approximately face each other radially, the signals which the load sensing sleeve 17 supplies are not perturbed by deformation of the cylinder head, the plug body 13 or other intermediate elements, except the linking tube.
  • the linking tube 18 which is very fine, has some elasticity in axial traction, retracting the proximal extremity 37 of the load sensing sleeve 17 in the distal direction, with a predetermined stiffness coefficient K2, the value of which can be adjusted by an appropriate choice of material forming the linking tube 18 and its dimensions.
  • the linking tube 18 is formed of a material chosen from stainless steels with high characteristics, and its thickness (difference between the radius of its external wall and that of its internal wall) is of the order of 0.2 mm.
  • the linking tube 18 is preferably of stainless steel with high characteristics, having a Young's modulus greater than 150 GPa, in particular of the order of 200 GPa, an elastic limit greater than 600 MPa, e.g.
  • a fatigue strength (maximum stress for which the number of cycles without breakage is infinite) of at least 300 MPa, e.g. of the order of 400 MPa.
  • it is of 17-4PH steel or inconel steel.
  • the electrical connection of electrode 12 can be made as described in EP2472181 .
  • the load sensing sleeve 17 includes at least one piezoelectric washer
  • the latter is assembled with a preload in axial compression, e.g. of the order of 100 N, to ensure that each piezoelectric washer is always compressed (by the elastic retractions K1 of the flexible collar 26 and K2 of the linking tube 18, which are prestressed), whatever the axial position of the heating rod 11, including in the case of low pressure in the combustion chamber. Consequently, the load sensing sleeve 17 supplies signals representing the variation of the axial compression stress to which it is subjected in the course of the axial movements of the heating rod 11 relative to the plug body 13.
  • This axial compression preload can be obtained by exerting an axial compression load between the fixing ring 15 (which has a shoulder extending radially towards the exterior and facing towards the distal side) and the proximal extremity 30 of the linking tube 18, at the instant of executing the peripheral weld 55 of the distal extremity 29 of the linking tube 18 onto the proximal extremity 28 of the fixing ring 15.
  • a process for manufacturing a glow plug according to the invention can be as follows.
  • the receiving sleeve 16 is fixed around the heating rod 11 by peripheral welding, then the fixing ring 15 is inserted and fixed around the receiving sleeve 16, in the flexible collar 26, by peripheral welding. Then the load sensing sleeve 17 is introduced via the proximal extremity 38 of the heating rod 11, until it comes against the proximal extremity of the receiving sleeve 16. A peripheral weld 53 of a distal ring 31 of the load sensing sleeve 17 onto the receiving sleeve 16 is executed. Then the linking tube 18 is introduced, via the proximal extremity 38 of the heating rod 11, around the load sensing sleeve 17.
  • the peripheral weld of the proximal extremity 30 of the linking tube 18 onto the proximal extremity 37 of the load sensing sleeve 17 is executed.
  • the peripheral weld of the distal extremity 29 of the linking tube 18 onto the proximal extremity 28 of the fixing ring 15 is executed.
  • the electrical connections of the heating rod 11 (via the electrode 12) and load sensing sleeve 17 are executed, and the various elements in the proximal portion of the glow plug are assembled.
  • the tube 45 of the plug body 13, which forms the receiving housing 14 is inserted, then the truncated distal extremity washer 47, and the whole is fixed by peripheral welding.
  • the heating rod 11 moves slightly axially in translation in the proximal direction, which compresses the load sensing sleeve 17, the piezoelectric washer(s) of which supply the electrical charges representing this compression.
  • the flexible collar 26 of the flexible membrane retracts the heating rod 11 of the distal side against the cylinder pressure, according to the stiffness coefficient K1. This retraction makes it possible to reduce, for the same value of pressure increase, the compression stresses to which the load sensing sleeve 17 is subjected, which increases its working range. It also makes it possible to limit the stresses to which the linking tube 18 is subjected.
  • the elasticity of the linking tube 18, according to the stiffness coefficient K2 makes it possible to reduce, on the one hand, the load to which the load sensing sleeve 17 is subjected for the same cylinder pressure, and on the other hand the compression stresses to which the flexible collar 26 is subjected.
  • the elasticity of the linking tube 18 according to the stiffness K2 makes it possible to retain an impermeability membrane (formed by the flexible collar 26) of sufficient thickness (in particular of the order of 0.2 mm), to the advantage of good disposal of calories by thermal conduction via this impermeability membrane, while avoiding this impermeability membrane being subjected to excessive stresses (at the risk of causing deformations in plasticity or deterioration of the membrane) under the effect of differential thermal expansion.
  • a glow plug of standard dimensions is obtained, incorporating a load sensor which supplies signals representing the cylinder pressure in a perfectly reliable and precise manner, not perturbed by the normal modes of deformation of the heating rod 11 or of the electrical power supply electrode 12, or by deformation of the plug body 13 or cylinder head.
  • the load sensing sleeve 17 is not subjected to temperatures greater than 170 °C.
  • the invention is as compatible with a heating rod 11 in the form of a metal tube 59, as with a heating rod in the form of a ceramic bar set in a peripheral metal tube.
  • the invention provides with a glow plug with which the "undershoot" (i.e. improper depression of the signal after a pressure pulse) are substantially deleted, and no longer detectable.
  • a hundred of glow plugs according to the invention (variant of figure 5 ) were manufactured, the half of which with metallic heating rod, the other half with a ceramic rod.
  • a hundred of glow plugs according to EP2469169 were manufactured, the half of which with metallic heating rod, the other half with a ceramic rod.
  • the pressure signals were obtained with various engine speeds from idle to maximum engine speed.
  • the glow plugs according to EP2469169 (curve C1) produced an undershoot with a mean value of about 1% of the maximum value of the pressure Pmax of each pressure pulse
  • the glow plugs according to invention (curve C2) produced an undershoot with a mean value of about 0.1% of the maximum value of the pressure Pmax of each pressure pulse, which is substantially insignificant when compared to the theoretical curve C0, and does not have to be electronically compensated.
  • the load sensing sleeve 17 can include a single piezoelectric washer or more than two piezoelectric washers, the proximal extremity of the load sensing sleeve 17 can be welded directly onto the heating rod, etc. Also, it is possible to provide that the axial extremity of the load sensing sleeve connected to the heating rod is its proximal extremity (and not its distal extremity), the distal extremity of the load sensing sleeve being connected to the plug body.
  • the welds can be implemented by laser welding or otherwise.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Measuring Fluid Pressure (AREA)

Claims (20)

  1. Glühkerze, umfassend:
    - einen Heizstab (11), der einen als den proximalen Abschnitt (50) bezeichneten Abschnitt besitzt, der ein als das proximale Ende (38) bezeichnetes axiales Ende besitzt, das mit einer elektrischen Stromzufuhrverbindung für den Heizstab versehen ist, wobei eine axiale Richtung des Heizstabes (11), die zu diesem proximalen Ende (38) hin gerichtet ist, als die proximale Richtung bezeichnet wird, wobei eine axiale Richtung des Heizstabes (11), die der proximalen Richtung entgegengesetzt ist, als die distale Richtung bezeichnet wird,
    - einen Kerzenkörper (13), der ein Aufnahmegehäuse (14) für den proximalen Abschnitt des Heizstabes besitzt, wobei der Heizstab einen distalen Abschnitt besitzt, der sich axial in der distalen Richtung über ein distales axiales Ende des Kerzenkörpers hinausragend erstreckt, das dem proximalen Ende des Heizstabes gegenüberliegt,
    - eine Montagebuchse (48) zum Montieren des proximalen Abschnitts des Heizstabes im Aufnahmegehäuse (14), wobei die Montagebuchse umfasst:
    -- eine Aufnahmemuffe (16) für den Heizstab, wobei die Aufnahmemuffe einen zylindrischen Körper umfasst, der starr und undurchlässig um den proximalen Abschnitt des Heizstabes herum befestigt ist,
    -- einen Befestigungsring (15), der an eine Innenfläche des Aufnahmegehäuses (14) geschweißt ist und sich um den proximalen Abschnitt des Heizstabes herum erstreckt,
    -- eine distale biegsame Membran:
    ▪ die sich von einem als das distale Ende bezeichneten axialen Ende in der distalen Richtung zur Außenseite des Körpers der Aufnahmemuffe hin erstreckt, wobei sich der Körper der Aufnahmemuffe von diesem distalen Ende des Körpers der Aufnahmemuffe ausgehend axial in der proximalen Richtung um den Heizstab herum erstreckt,
    ▪ die über eine gasundurchlässige Verbindung, die mindestens eine Schweißung der biegsamen Membran an den Befestigungsring umfasst, starr mit dem Kerzenkörper verbunden ist,
    ▪ die für Gase undurchlässig ist und einen proximalen Bereich des Aufnahmegehäuses begrenzt, der nicht der Atmosphäre einer Brennraums eines Motors ausgesetzt ist, der die Glühkerze aufnimmt,
    ▪ die elastisch biegeverformbar ist und eine geeignete Biegeelastizität besitzt, um axiale Translationsbewegungen des Heizstabes relativ zum Kerzenkörper zu ermöglichen,
    ▪ die eine biegsame Manschette umfasst, die sich radial orthogonal relativ zum Körper der Aufnahmemuffe erstreckt,
    ▪ die mindestens über einen radialen Endabschnitt der biegsamen Membran mit dem Befestigungsring (15) verbunden ist,
    - einen Lastsensor, der sich vollständig innerhalb des proximalen Bereichs des Aufnahmegehäuses erstreckt,
    wobei die biegsame Membran an den Befestigungsring (15) geschweißt ist, mindestens über einen radialen Endabschnitt der biegsamen Membran, der an den Befestigungsring (15) geschweißt ist, und wobei die biegsame Membran ebenfalls eine ringförmige Verbindungsverstärkung (58) umfasst, die:
    - sich radial in Verlängerung der biegsamen Manschette zur Außenseite hin erstreckt,
    - an den Befestigungsring (15) geschweißt ist, um den radialen Endabschnitt zu bilden,
    - sich von der biegsamen Manschette ausgehend und über diese hinaus axial in der distalen Richtung erstreckt.
  2. Glühkerze nach Anspruch 1, wobei die ringförmige Verbindungsverstärkung (58) eine proximale radiale Fläche besitzt, die an ein distales Ende des Befestigungsrings (15) geschweißt ist.
  3. Glühkerze nach entweder Anspruch 1 oder Anspruch 2, wobei die biegsame Manschette von konstanter axialer Dicke ist und die ringförmige Verbindungsverstärkung (58) eine radiale Dicke besitzt, die größer ist als die axiale Dicke der Manschette.
  4. Glühkerze nach einem der Ansprüche 1 bis 3, wobei die biegsame Manschette von konstanter axialer Dicke ist und die ringförmige Verbindungsverstärkung (58) eine axiale Dicke besitzt, die größer ist als die axiale Dicke der Manschette.
  5. Glühkerze nach einem der Ansprüche 2 bis 4, wobei die proximale radiale Fläche der ringförmigen Verbindungsverstärkung (58) und das distale Ende des Befestigungsrings (15) gemäß einer zugewandten radialen Dicke miteinander in Kontakt sind, wobei die proximale radiale Fläche des ringförmigen Verstärkungselements über die gesamte ihrer zugewandten radialen Dicke an das distale Ende des Befestigungsrings geschweißt ist.
  6. Glühkerze nach einem der Ansprüche 1 bis 5, wobei sich die ringförmige Verbindungsverstärkung (58) radial so erstreckt, dass sie eine umlaufende Kontaktfläche besitzt, die mit einer Innenfläche des Aufnahmegehäuses in Kontakt ist.
  7. Glühkerze nach Anspruch 6, wobei die ringförmige Verbindungsverstärkung (58) eine distale Endfläche besitzt, die einen Übergang zur umlaufenden Kontaktfläche besitzt, wobei sich die distale Endfläche an diesem Übergang radial orthogonal zu der umlaufenden Kontaktfläche erstreckt.
  8. Glühkerze nach entweder Anspruch 6 oder Anspruch 7, wobei die umlaufende Kontaktfläche der ringförmigen Verbindungsverstärkung (58) über mindestens eine umlaufende Schweißung an die Innenfläche des Aufnahmegehäuses geschweißt ist.
  9. Glühkerze nach einem der Ansprüche 1 bis 8, wobei die Manschette über einen gekrümmten aufgeweiteten Abschnitt (40) mit kontinuierlicher Krümmung, die eine zum proximalen Ende des Heizstabes hin gerichtete Konkavität besitzt, mit dem distalen Ende des Körpers der Aufnahmemuffe (16) verbunden ist.
  10. Glühkerze nach Anspruch 9, wobei der gekrümmte aufgeweitete Abschnitt (40) an einem Übergangsbereich des gekrümmten aufgeweiteten Abschnitts (40) zum Heizstab an den Heizstab geschweißt ist.
  11. Glühkerze nach entweder Anspruch 9 oder Anspruch 10, wobei der gekrümmte aufgeweitete Abschnitt (40) einen äußeren Krümmungsradius von weniger als 0,5 mm besitzt.
  12. Glühkerze nach einem der Ansprüche 1 bis 11, wobei der Körper der Aufnahmemuffe (16) von einer zylindrischen Wand gebildet wird, die in einem distalen Abschnitt (66) dieser zylindrischen Wand eine kleinere radiale Dicke besitzt, wobei sich der distale Abschnitt am distalen Ende des Körpers der Aufnahmemuffe erstreckt.
  13. Glühkerze nach den Ansprüchen 2 und 12, wobei die Manschette eine axiale Dicke der gleichen Größenordnung wie die radiale Dicke des distalen Abschnitts (66) besitzt.
  14. Glühkerze nach einem der Ansprüche 1 bis 13, wobei die Aufnahmemuffe (16) um ein umlaufendes Metallrohr des proximalen Abschnitts des Heizstabes herum platziert ist, wobei sich das umlaufende Metallrohr axial ebenfalls in den proximalen Bereich des Aufnahmegehäuses (14) hinein erstreckt.
  15. Glühkerze nach einem der Ansprüche 1 bis 14, wobei der rohrförmige Lastsensor axial unmittelbar an ein proximales axiales Ende der Aufnahmemuffe (16) angrenzt, das dem distalen Ende der Aufnahmemuffe gegenüberliegt.
  16. Glühkerze nach einem der Ansprüche 1 bis 15, wobei der Lastsensor eine rohrförmige Lastsensormuffe (17) ist, die sich vollständig innerhalb des proximalen Bereichs des Aufnahmegehäuses (14) um den proximalen Abschnitt (50) des Heizstabes (11) herum erstreckt.
  17. Glühkerze nach Anspruch 16, wobei die rohrförmige Lastsensormuffe (17) besitzt:
    - ein erstes axiales Ende (32), das in einer solchen Weise mit dem Heizstab verbunden ist, dass es durch Bewegungen des Heizstabes mindestens in der proximalen Richtung zu dem proximalen Ende des Heizstabes hin in axialer Translation angetrieben wird, und in der der Heizstab dazu tendiert, zur Innenseite des Kerzenkörpers zurückzukehren, und
    - ein zweites axiales Ende (37), das dem ersten axialen Ende gegenüberliegt, wobei das zweite axiale Ende in einer solchen Weise mit dem Kerzenkörper verbunden ist, dass axiale Translationsbewegungen des Heizstabes relativ zum Kerzenkörper axiale Druck- und/oder Zugbelastungen in der Lastsensormuffe erzeugen.
  18. Glühkerze nach Anspruch 17, wobei das erste axiale Ende (32) ein distales axiales Ende der rohrförmigen Lastsensormuffe (17) ist, das dem proximalen Ende des Heizstabes axial gegenüberliegt, und wobei das zweite axiale Ende (37) ein proximales axiales Ende der rohrförmigen Lastsensormuffe (17) ist, das axial zum proximalen Ende des Heizstabes hin gerichtet ist.
  19. Glühkerze nach entweder Anspruch 17 oder Anspruch 18, wobei das erste axiale Ende (32) mit dem umlaufenden Metallrohr des proximalen Abschnitts (50) des Heizstabes (11) verbunden ist.
  20. Glühkerze nach einem der Ansprüche 17 bis 19, wobei das zweite axiale Ende (32) mit dem Befestigungsring verbunden ist.
EP16707746.0A 2015-03-04 2016-03-02 Glühkerze mit lastsensor und geschweisster flexibler distaler membran mit transversalem flexiblem kragen Not-in-force EP3247942B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15157632.9A EP3064835B1 (de) 2015-03-04 2015-03-04 GLÜHKERZE MIT LASTSENSOR UND GESCHWEIßTER FLEXIBLER DISTALER MEMBRAN MIT TRANSVERSALEM FLEXIBLEM KRAGEN
PCT/EP2016/054438 WO2016139251A1 (en) 2015-03-04 2016-03-02 Glow plug including a load sensor and a welded flexible distal membrane having a transversal flexible collar

Publications (2)

Publication Number Publication Date
EP3247942A1 EP3247942A1 (de) 2017-11-29
EP3247942B1 true EP3247942B1 (de) 2018-12-12

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EP15157632.9A Withdrawn - After Issue EP3064835B1 (de) 2015-03-04 2015-03-04 GLÜHKERZE MIT LASTSENSOR UND GESCHWEIßTER FLEXIBLER DISTALER MEMBRAN MIT TRANSVERSALEM FLEXIBLEM KRAGEN
EP16707746.0A Not-in-force EP3247942B1 (de) 2015-03-04 2016-03-02 Glühkerze mit lastsensor und geschweisster flexibler distaler membran mit transversalem flexiblem kragen

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EP15157632.9A Withdrawn - After Issue EP3064835B1 (de) 2015-03-04 2015-03-04 GLÜHKERZE MIT LASTSENSOR UND GESCHWEIßTER FLEXIBLER DISTALER MEMBRAN MIT TRANSVERSALEM FLEXIBLEM KRAGEN

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EP (2) EP3064835B1 (de)
WO (1) WO2016139251A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2469169B1 (de) 2010-12-22 2017-08-16 HIDRIA AET Druzba za proizvodnjo vzignih sistemov in elektronike d.o.o. Glühkerze mit einer Hülse zur Aufnahme eines Heizstabs mit einem distal aufgebogenen Teil
EP2472181B1 (de) 2010-12-22 2014-09-10 HIDRIA AET Druzba za proizvodnjo vzignih sistemov in elektronike d.o.o. Zündkerze mit Lastfühlhülse um einen Heizstab außerhalb einer Brennkammer
JP5838033B2 (ja) * 2011-02-25 2015-12-24 日本特殊陶業株式会社 燃焼圧力センサ付きグロープラグ
WO2014122958A1 (ja) * 2013-02-08 2014-08-14 ボッシュ株式会社 圧力センサ一体型グロープラグ及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
EP3247942A1 (de) 2017-11-29
WO2016139251A1 (en) 2016-09-09
EP3064835B1 (de) 2018-04-25
EP3064835A1 (de) 2016-09-07

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