WO2016055233A1 - Corps de chauffe pour bougie de préchauffage pouvant être allumée électriquement, comprenant une charge de chauffe comprimée axialement, et procédé de fabrication correspondant - Google Patents

Corps de chauffe pour bougie de préchauffage pouvant être allumée électriquement, comprenant une charge de chauffe comprimée axialement, et procédé de fabrication correspondant Download PDF

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Publication number
WO2016055233A1
WO2016055233A1 PCT/EP2015/070827 EP2015070827W WO2016055233A1 WO 2016055233 A1 WO2016055233 A1 WO 2016055233A1 EP 2015070827 W EP2015070827 W EP 2015070827W WO 2016055233 A1 WO2016055233 A1 WO 2016055233A1
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WO
WIPO (PCT)
Prior art keywords
coil
glow tube
glow
powder
insulating powder
Prior art date
Application number
PCT/EP2015/070827
Other languages
German (de)
English (en)
Inventor
Bruno CERON NICOLAT
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP15775109.0A priority Critical patent/EP3204693A1/fr
Priority to CN201580054417.9A priority patent/CN106796030B/zh
Publication of WO2016055233A1 publication Critical patent/WO2016055233A1/fr

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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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • 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
    • F23Q2007/004—Manufacturing or assembling methods
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/027—Heaters specially adapted for glow plug igniters

Definitions

  • the invention relates to a radiator for an electrically heatable glow plug or glow plug, and more particularly to a glow plug radiator with a heating insert provided therein, wherein the heating insert consists of at least one helix and insulating powder acting as an electrical resistance element. Furthermore, the invention relates to a production method of such a radiator according to the invention for an electrically heatable
  • glow plugs currently come not only as a cold-start aid in a chamber of an internal combustion engine, such as a pre-vortex or combustion chamber of a luftverêtnden, self-igniting diesel engine
  • Motor vehicles with flexible-fuel drives that is, drive systems with Gasoline, the alcohols methanol and ethanol and any mixtures of these three fuels can be operated at low temperatures, igniting the ignition of the fuel, with a heating of the
  • the glow plugs used usually have a helix acting as an electrical resistance element, which consists either of two interconnected helical parts of different materials consists, that is, from a heating coil and a control coil connected to this, or consists of a single coil, a so-called Mono Listel, which combines the properties of a control and a heating coil in a single coil.
  • FIG. 8 An example of a glow plug with a heating filament portion 91 1 and control coil portion 912 existing helix 91, as shown in Figure 8, is known for example from Bosch as a so-called Duratherm-Chromium glow plug.
  • the glow plug 9 shown therein consists of the coil 91, which is disposed within a metal glow tube 92, wherein the
  • Glow tube 92 is held in a housing 93.
  • the helix 91 is embedded within the glow tube 92 in electrically insulating but heat-conductive filling powder 94.
  • Plus contact of the glow plug 9 represents.
  • the negative contact of the coil 91 is via the glow tube 92 and on via the housing 93 to the engine block educated.
  • the connecting bolt 95 is held opposite the glow tube 92 by an electrically insulating glow tube seal 96 and with respect to the housing 93 with an electrically insulating housing seal 97.
  • a round plug 98 is arranged at the free end of the connecting bolt 93 for electrically contacting the positive contact of the coil 91, wherein a
  • Insulating washer 99 is provided for electrical insulation between round plug 98 and housing 93.
  • the helix 91, the glow tube 92, the insulating powder 94, the terminal bolt 95 and the glow tube seal 96 thereby constitute a so-called radiator of the glow plug, also referred to as a heater or glow plug.
  • the coil 91 is first inserted into the glow tube 92, connected thereto, for example, by welding, then the glow tube 92 with the thermally conductive and electrically insulating
  • Round kneading processes processed to a certain extent.
  • the rotary kneading is performed mainly for compressing the interior of the glow tube 92 to ensure good heat conduction from the coil 91 to the outer surface of the glow tube 92. In the taking place by the swaging
  • the helix 91 is heavily deformed.
  • highly ductile metals or metal alloys such as iron or nickel alloys
  • Helix wire diameter increase and the original round cross section of the helix 91 is correspondingly oval.
  • Helix wire diameter increase and the original round cross section of the helix 91 is correspondingly oval.
  • a radiator of an electrically heatable glow plug having a glow tube and arranged in the glow tube heating insert, which consists of at least one coil, also referred to as incandescent, and a thus pressed insulating powder, wherein the Heating insert is an axially pressed component.
  • An axially pressed component also referred to as an axially pressed component, is to be understood as a component made up of different components which are connected to one another by means of at least one pressing tool by means of a pressing or compacting operation carried out in the axial direction of the pressed component such that the pressed component retains its component retains final shape and how a brittle material can be handled.
  • a pressing tool usually consists of two
  • Press punches also called press punches, which are to be pressed
  • the resulting heating insert which consists of at least the helix and the compacted insulating powder after pressing, can also be referred to as a helix compact powder composite.
  • the glow tube is in the radiator according to the invention usually a one-sided closed, tubular member which may be formed either as a separate part, which may be held in a housing of the glow plug may, or sometimes may be formed as part of the housing of the glow plug.
  • the glow tube may consist of a corresponding metal, preferably of a high temperature metal alloy such as a
  • Nickel alloy The helix as an internal heating conductor is in
  • Embedded insulating powder wherein the helix is either a so-called
  • Einstoff mindfull or Mono Listel is that combines the heating and regulating function, or is a so-called two-substance coil, which consists of at least two interconnected coil parts made of different materials, that is, a heating coil and connected to this control coil.
  • a two-material coil usually come as
  • Standard helix material ferrous alloys for example CoFe8, or nickel alloys are used in conjunction with Bankleiterlegmaschineen such as the iron alloy CrAI 25 5 with 70% iron content.
  • Rule coil material may alternatively be used molybdenum or tungsten.
  • the positive pole is formed by a first end of the helix, and the negative pole takes place by a connection of the second end of the helix with the glow tube, which is connected via the preferably metallic housing of the glow plug with the engine block as a ground connection. It can still be a receiving part between the glow tube and the
  • the insulating powder of the heating body of the present invention has a thermal expansion coefficient at least similar to that of the material of the surrounding coil in size and temperature characteristics.
  • the insulating powder may preferably consist of magnesium oxide (MgO), aluminum oxide (Al 2 O 3 ), silicon nitride, boron nitride, silicon carbide or aluminum nitride.
  • the heating insert may further comprise a powder compact, which is arranged in an inner cavity of the coil, that is, in the surrounding by the preferably helical coil cavity or
  • the insulating powder and the powder compact consist of different powder materials or wherein the insulating powder and the powder compact consist of the same powder material with different particle sizes. It can be used as a material alumina inside the coil and
  • a powder compact is understood to mean a component pressed from powder, which can then be handled as a powder composite in the form of a single component. This has the advantage in the present invention that a powder compact can be inserted into the helix and then pressed together with the helix and the insulating powder during the pressing process, without the powder of the powder compact mixed with the insulating powder before pressing.
  • the helix of the heating element is electrically connected to the glow tube. More specifically, the coil of the heating insert, at least partially from the
  • Heating insert is exposed and the negative pole or negative contact of the coil forms, with an inner side of the glow tube to the closed, exposed from the housing end materially connected, preferably by welding or soldering.
  • the helix can be materially connected to the glow tube before pressing the heating element.
  • a glow plug having such a heater.
  • heater according to the invention this, as already known from the above-mentioned prior art, including a housing, electrically insulating housing seals that isolate the terminal bolt relative to the housing, a round plug, which at the exposed end of the
  • Connecting bolt is provided, and have an insulating, the electrical insulation between round plug and housing is provided.
  • the connection bolt may be in electrical contact with a second end of the coil, which is opposite to the first end of the coil connected to the glow tube and forms the plus pole or positive contact of the coil, for example by screwing on, press-fitting or a similar method , It is also conceivable to provide an electrically conductive compression component between the coil and the connecting bolt, which facilitates an electrical connection between these components.
  • a method for producing a heating element of an electrically heatable glow plug in particular for producing a heating element as described above, the method according to the invention comprising the following steps in this order:
  • a step of inserting a terminal bolt into the glow tube and establishing an electrical connection between terminal bolt and coil preferably by press-fitting, caulking, magnet forming, screwing, welding or soldering;
  • the helix in the method according to the invention, as a first step, the helix must be shaped in such a way that after being pressed together with the helix
  • Insulating powder is compressed to a previously designed shape with one or more spiral diameters of the turns and certain distances between the individual turns, a so-called spiral design.
  • a single-material or two-material coil with heating and control coil made of different materials can be used as a helix.
  • the step of axially pressing the filament and the insulating powder to the heating insert is accordingly the helix together with the electrically insulating
  • Insulating powder is pressed or compressed into a composite, wherein the heating insert is an axially pressed component, also referred to as axially compressed component.
  • axially pressed component also referred to as axially compressed component.
  • Pressing tool are connected so that the pressed component retains its final shape and how a brittle material can be handled.
  • a pressing tool usually consists of at least one plunger, also called a punch, which is to be pressed
  • the step of providing at least the helix and an insulating powder surrounding it may further comprise a powder compact arranged in the interior of the helix, that is in the cavity or helix surrounding the helical helix, preferably the helix Insulating powder and the powder compact consist of different powder materials or wherein the insulating powder and the powder compact consist of the same powder material with different particle sizes.
  • Powder compact is a powder pressed and possibly hardened
  • Insulating powder performed to the heating element in the glow tube.
  • the centering aid is removed from the glow tube before the step of axial pressing. More specifically, before being pressed, the helix and the insulating powder are inside the one-side closed glow tube and are then pressed into the glow tube and compressed into the heating element, the helix being electrically connected to the glow tube prior to pressing, preferably by welding or brazing. In this case, the axial pressing by a
  • Plunger take place, which has either a smooth pressure-exerting side or face or wherein the pressure-exerting side of the plunger preferably has a recess or notch in which a first end of the coil is received, namely the end of the coil forming the positive contact, the later brought into contact with the terminal bolt.
  • the pressure-exerting end of the plunger may also have a tapered outer diameter, then in the step of axial pressing, the pressure-exerting end of the plunger is surrounded by the first end of the coil, so that in the step of the axial
  • the step of axially pressing at least the helix and the insulating powder to the heating insert is carried out independently of the glow tube separately in a pressing device which consists of at least a plunger, a counterpressure punch and a die, preferably a cylindrical die ,
  • a pressing device which consists of at least a plunger, a counterpressure punch and a die, preferably a cylindrical die .
  • the finished pressed heating insert is inserted into the glow tube and the coil is electrically connected to the glow tube, preferably by a cohesive bonding method such as welding or soldering.
  • the method of the present invention is provided with the step of filling a part of an inner space of the glow tube with filler, the step of inserting a terminal bolt into the glow tube and establishing electrical connection between terminal bolt and coil, and the step of sealing the inner space of the glow tube with a sealing member continued.
  • the pressure-exerting side of the plunger may have a recess or notch in which a first end of the coil is received, namely the end of the coil which forms the positive contact, which in connection with the terminal bolt in connection is brought. Additionally or alternatively, the pressure exerting side of the
  • Counterpressure plunger have a recess or notch in which the other end of the coil is received, namely the end of the coil, which is materially connected to an inner side of the glow tube at its closed, exposed from the housing end, preferably by welding or soldering.
  • Counterpressure punch and die can be the helix prior to the step of axial pressing and during the filling of the insulating powder in the mold held centered in the die by a centering member so that the insulating powder is evenly distributed around the helix. More precisely, the helix is inserted centrally in the mold by means of the centering component acting as a centering aid.
  • the centering component can be a
  • the second end of the coil to be connected to the glow tube may be a removable material, a so-called placeholder, preferably made of plastic foam or a similar spongy material, such as polyamide,
  • the heat conduction of helix to the glow tube surface can be secured and it can on the Reduction of the finished composite glow tube by means of rotary swaging dispensed with or at least significantly reduced.
  • the heat conduction is secured by helix or the Schuetzlab bainsky the coil to the glow tube, with a considerable saving of Komprimier suitsen the finished composite glow tube is achieved by avoiding the swirling.
  • the production of the radiator without swaging the coil is less damaged or left completely intact, which significantly improves both the reproducibility of the process and the robustness of the glow plug.
  • the present invention thus provides a radiator for a glow plug and a related manufacturing method that significantly reduces the undesirable deformation of the coil of the radiator during the rotary swaging of the glow tube or even completely avoids. This is done by an axial compression of coil and electrically insulating but thermally conductive insulating powder to a compressed heating element before or after its installation in the glow tube, wherein the heating insert is electrically conductive in the axial direction and electrically insulating in the radial direction.
  • Figure 1 shows a radiator for a glow plug according to a first
  • Figure 2 shows a radiator for a glow plug according to a second preferred embodiment of the invention in a cutaway cross-sectional view
  • Figure 3 shows a radiator for a glow plug according to a third
  • FIG. 4 shows successive steps of a manufacturing method of the radiator for a glow plug according to the first preferred embodiment shown in FIG. 1 in a cross-sectional view;
  • FIG. 5 shows an extract of successive steps of a
  • FIG. 6 shows an extract of successive steps of a
  • Figure 7 shows an extract of successive steps of an alternative
  • Figure 8 shows a glow plug according to the prior art in a
  • radiator 1 shows a radiator 1 according to the invention for a glow plug according to a first preferred embodiment, in which for reasons of clarity components such as a housing and
  • the radiator 1 shown in Figure 1 has a metal glow tube 11, a heating insert 12 disposed therein, which is disposed inside a closed end 112 of the glow tube 11, and a connection bolt 13 which communicates via a contact element 14 with the heating element 12.
  • the heating element 12 and the connecting bolt 13 are from the side of an open end 111 of the Inserted glow tube 11 in this, which is arranged opposite to the closed end 112 of the glow tube 11.
  • the heating insert 12 consists of a compressed composite of a coil 121 and an insulating powder 122.
  • a first end 1211 of the coil 121 which is arranged opposite to the closed end 112 of the glow tube 11, establishes the connection of the heating insert 12 with the contact element 14.
  • a second end 1212 of the coil 121 is in electrical connection with the closed end 112 of the glow tube 11, wherein the second end 1212 of the coil 121 with the closed end 112 of the glow tube 11 cohesively in
  • Connection is, for example, by the second end 1212 of the coil 121 is welded to the inside of the glow tube 11 at the closed end 112, or by the second end 1212 of the coil 121 is connected through the closed end 112 with this material fit.
  • Graphite tablet or the like are surrounded by an electrically insulating filling material 15, such as a ceramic powder, a sintered ceramic, a ceramic foam or the like, wherein the
  • Filler material 15 is held by an annular insulating sealing element 16 in the glow tube 11.
  • the filling material 15 is filled through the open end 111 of the glow tube 11.
  • the filling material 15 may alternatively also
  • FIG. 2 shows a radiator 1 'according to the invention for a glow plug according to a second preferred embodiment, in which for reasons of clarity components such as a housing and insulating components and connecting elements have been omitted.
  • the illustrated in Figure 2 part of the radiator 1 ' has a metal glow tube 11', a heating insert 12 'disposed therein, which is disposed inside a closed end 112' of the glow tube 11 ', and a connection bolt 13', which is connected to the heating element 12 'communicates.
  • the heating element 12 'and the connecting bolt 13' are inserted from the side of an open end 111 'of the glow tube 11' in this, which is arranged opposite to the closed end 112 'of the glow tube 11'.
  • the heating insert 12 ' consists of a compressed composite of a coil 121' and an insulating powder 122 '. A first end 1211 'of the coil 121' opposite to the closed end 112 'of the glow tube 11'
  • a second end 1211 'of the coil 121' in this case differs from the embodiment shown in FIG. 1 from a coil section projecting from the heating element 12 'in the direction of the connecting bolt 13', which protrudes into a recess 131 'of the connecting bolt 13' and with the latter Ground is materially connected, the
  • Connection bolt 13 ' is provided.
  • the second end 1212 'of the coil 121' is similar to the embodiment shown in FIG.
  • Example a ceramic powder, a sintered ceramic, a ceramic foam or the like, wherein the filling material 15 'is held by an annular insulating sealing member 16' in the glow tube 11 '.
  • the filling material 15 ' is filled through the open end 111' of the glow tube 11 '.
  • Filling material 15 ' may alternatively be provided empty space.
  • Figure 3 shows a radiator according to the invention 1 "for a glow plug according to a third preferred embodiment, in which for reasons of clarity components such as a housing and insulating components and connecting elements have been omitted.
  • the heating element 1 "according to the invention shown in FIG. 3 shows a metal glow tube 11", a heating insert 12 "arranged inside a closed end 112" of the glow tube 11 ", and a connection bolt 13" connected to the heating element 12 ".
  • the heating insert 12 "and the connecting bolt 13" are inserted from the side of an open end 111 "of the glow tube 11", which is arranged opposite to the closed end 112 "of the glow tube 11"
  • Third preferred embodiment unlike the previously described embodiments has a varying diameter and consists of the open end 111 "of the glow tube
  • Section IIA "and the second section IIB” is gradually tapered. This results in the interior of the glow tube 11 "a funnel shape, which is closer to the closed end 112" of the glow tube 11 "out.
  • the heating insert 12 consists of a compressed composite of a coil 121" and an insulating powder 122 ".
  • a first end 1211" of the coil 121 opposite to the closed end 112" of the glow tube 11 "constitutes the connection of the heating insert 12 "with the
  • the first end 1211 "of the coil 121" which communicates with the connecting bolt 13 ", in this case consists, unlike in the preceding embodiments, of a heating element protruding from the heating insert 12" in the direction of the connecting bolt 13 " has an extended shape with enlarged inner diameter, so one
  • Winding shape in which the distance between the individual turns and their spiral diameter is greater than that in the insulating powder 122 "arranged part of the coil 121".
  • the first end 1211 “of the coil 121 ' is partially wrapped around the connecting bolt 13" and connected to this materially.
  • a second end 1212 "helix 121" is in electrical communication with the closed end 112 "of the glow tube 11" similar to the previous embodiments, for example by the second end 1212 "of the helix 121" with the inside of the glow tube 11 "at the end thereof 111 “is welded, or by the second end 1212” the helix 121 " through the closed end 112 "is connected to this materially bonded.
  • the part of the connecting bolt 13 "located inside the glow tube 11" and the first end 1211 “of the coil 121" protruding from the heating element 12 are surrounded by an electrically insulating filling material 15", such as a ceramic powder, a sintered ceramic a ceramic foam or the like, wherein the filling material 15 "is held in the glow tube 11" by an annular insulating sealing member 16 ".”
  • the filling material 15 protrudes with a portion 151" into one in the heating insert
  • FIG. 4 shows a sequence of individual steps (a) to (f) involving a
  • Radiator 1 represent.
  • the preformed helix 121 is first inserted into the glow tube 11 and connected at its second end 1212 to the closed end 112 of the glow tube 11, for example by the second end 1212 of the helix 121 with the inside of the glow tube 11 welded at its closed end 112.
  • the first end 1211 of the helix 121 is held centrally by a centering aid 2 in the glow tube 11, which is inserted into the glow tube 11.
  • the insulating powder 122 is filled in the glow tube 11, while the first end 1211 of the coil 121 is further held by a centering aid 2 in the center of the glow tube 11, so that the
  • a step (c) the centering aid 2 is removed from the glow tube 11 and a plunger 3 is inserted into the glow tube 11, which comes into contact with the composite of coil 121 and insulating powder 122.
  • the coil 121 still has its preformed shape in this state Output length LI on.
  • a force F is exerted on both sides of the helix insulating powder composite.
  • the glow tube 11 is preferably held in a (not shown) holder or the like in order to provide a counter force against the force exerted by the plunger 3 force.
  • Compressive force F from both sides of the helix insulating powder composite is compressed from step (c) to step (d) of the spiral insulating powder composite and to the desired heating insert 12 in the form of a composite of helix 121 and compacted or compressed insulating powder 122, So pressed into a spiral compact powder composite. This process of compacting the
  • the step of axial pressing Composite of helix 121 and insulating powder 122 to the heating element 12 in the form of helical Kompaktpulver- composite is referred to as the step of axial pressing.
  • the coil 121 after compression by the plunger 3 has a reduced overall length L2, which is smaller than the
  • connection bolt 13 inserted into the glow tube 11, wherein the contact element 14 makes electrical contact between the first end 1211 of the coil 121 and the connecting bolt 13. Furthermore, the remaining space in the
  • Glow tube 11 filled with the filler 15 in the form of a ceramic powder, which completely surrounds the contact element 14 and arranged in the glow tube 11 of the connecting bolt 13. The interior of the glow tube 11 is further sealed by the sealing element 16.
  • FIG. 5 shows a modified form of the step sequence shown in FIG. 4, in which steps (c), (d) and (f) are to be replaced by steps (c '), (d') and (f), and FIGS thus constitute a manufacturing method of the radiator 1 'shown in FIG. 2 and described above.
  • the remaining steps are identical to the respective steps of the method illustrated in FIG.
  • a significant difference in the method shown in Figure 5 can be found in the nature of the plunger 3 'and the first end 1211' of the coil 121 '.
  • the plunger 3' on its pressure-exerting side or end face has a recess 31 'in which the first end 1211' of the coil 121 'is received in the axial pressing becomes.
  • FIG. 6 shows a further modified form of that shown in FIG.
  • the remaining steps are identical to the respective steps of the method illustrated in FIG. In the further modified in the shown in Figure 6
  • Spiral diameter has that, although it is held by a centering 2 "in the center of the glow tube 11", the plunger 3 "but through the spiral turns within it is arranged and with its pressure-exerting end face on the Isolierpulver 122" rests.
  • the plunger 3 indicates its pressure-exerting end to a tapered outer diameter, which thereby has a conical shape.
  • the initial length LI of the rest of the coil 121 is located inside the insulating powder 122", so it is completely surrounded by this.
  • Insulating powder 122 "compressed and thus reduces its overall length to L2, the coil 121" correspondingly compressed. Due to the conical shape of the pressure-exerting end of the plunger 3 "is a corresponding
  • the centering aid 2 "remains in the glow tube 11" during the axial pressing step to keep the first end 1211 "of the coil 121" centered and thereby center the plunger 3 "
  • Insulation powder 122 "thus extends over the second portion IIB” of smaller diameter of the glow tube 11 "and over the transition between the first portion IIA” and the second portion IIB “, which gradually tapers, see Figure 3.
  • the first end 1211 As a result, the coil 121 "experiences no axial pressing force and retains its original shape. After removal of the plunger 3" from the glow tube 11 ", the heating insert 12" produced by the axial pressing remains in the glow tube 11 ".
  • the terminal bolt 13 is inserted into the glow tube 11" and protrudes at least partially into the first end 1211 “of the coil 121", with the terminal bolt 13 'coming into contact therewith, whereby an electrical contact between the first end 1211 "of the Furthermore, the remaining space in the glow tube 11 "including the voids 1221” is filled up with the filling material 15 "in the form of a ceramic powder which surrounds the part of the connecting bolt 13" arranged in the glow tube 11 ". and the protruding first end 1211 "completely surrounds the coil 121".
  • the filling material 15 protrudes with a portion 151" into the cavity 12 "pressed in the heating insert 12", more precisely into the cavities 1221 "pressed into the insulating powder 122.
  • FIG. 7 shows an alternative method with the steps (B), (C), (D), (E) and (F), in which a heating body 1 'is produced, as already known from FIG.
  • a pressing device 4 ' is used, which consists of a pressure punch 41', a counter punch 42 'and a die 43'.
  • the mold 43 ' may have a one-piece shape, but may also have a two- or multi-part shape.
  • the first end 1211 'of the coil 121' is held by a centering aid 2 'in the center in the mold 43', more precisely in a through hole 431 'of the mold 43', as can be seen in step (B). Further, the second end 1212 'of the coil 121' in a
  • Recess 421 ' is included, which is provided in the pressure-exerting end face of the counterpressure plunger 42'.
  • the insulating powder 122 ' is in the
  • the first end 1211 'of the coil 121' is received in a recess 411 'of the plunger 41'. Subsequently, a pressure force F on the plunger 41 'and a pressing force F on the
  • Total length of coil 121 ' is compressed from LI to L2, see step (D).
  • the first end 1211 'and the second end 1212' of the coil 121 ' may each be surrounded by a removable plastic foam to keep them free of insulating powder 122' during the axial pressing step.
  • step (E) the heating element 12 'can be removed from the pressing device 4' and the plastic foam can be removed so that the two ends 121 1 'and 1212' of the coil 121 'are free of insulating powder 122' the heating insert 12 'protrude.
  • the heating insert 12 ' is inserted into the glow tube 11' in step (F) and the second end 1212 'of the coil 121' is integrally connected to the closed end 112 'of the glow tube 11' so that they are in electrical connection with one another.
  • connection bolt 13 ' is inserted into the glow tube 11' and establishes an electrical contact between the first end 1211 'of the coil 121' and the connection bolt 13 '.
  • the protruding first end 1211 'of the coil 121' is in the
  • Recess 131 ' is included, which is provided in the terminal bolt 13' in its end face, which to the closed end 112 'of
  • Glow tube 11 ' has. Furthermore, the remaining space is filled in the glow tube 11 'with the filler 15' in the form of a ceramic powder, which in the glow tube 11 'arranged part of the connecting bolt 13' and the
  • Embodiment limited and are correspondingly interchangeable.

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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)

Abstract

La présente invention concerne un corps de chauffe (1) d'une bougie de préchauffage pouvant être allumée électriquement, qui a un tube de recuit (11) et une charge de chauffe (12) disposée dans le tube de recuit (11), qui comporte au moins une hélice (121) et une poudre isolante (122) comprimée avec celle-ci, la charge de chauffe (12) étant un élément comprimé axialement. En outre, la présente invention concerne un procédé de fabrication d'un corps de chauffe (1) pour une bougie de préchauffage qui peut être allumée électriquement.
PCT/EP2015/070827 2014-10-07 2015-09-11 Corps de chauffe pour bougie de préchauffage pouvant être allumée électriquement, comprenant une charge de chauffe comprimée axialement, et procédé de fabrication correspondant WO2016055233A1 (fr)

Priority Applications (2)

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EP15775109.0A EP3204693A1 (fr) 2014-10-07 2015-09-11 Corps de chauffe pour bougie de préchauffage pouvant être allumée électriquement, comprenant une charge de chauffe comprimée axialement, et procédé de fabrication correspondant
CN201580054417.9A CN106796030B (zh) 2014-10-07 2015-09-11 具有轴向压制的加热插件的用于能够电加热的电热塞的加热体和从属的制造方法

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DE102017215936A1 (de) * 2017-09-11 2019-03-14 Robert Bosch Gmbh Verfahren zur Herstellung einer Glühstiftkerze
DE102019127689A1 (de) * 2019-10-15 2021-04-15 Türk & Hillinger GmbH Elektrischer Rohrheizkörper mit Anschlussbolzen und Herstellungsverfahren für elektrische Rohrheizkörper mit Anschlussbolzen

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US20090090705A1 (en) * 2007-10-05 2009-04-09 Yuki Okumura Glow plug and manufacturing method of the same

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DE102014220235A1 (de) 2016-04-07
CN106796030A (zh) 2017-05-31
EP3204693A1 (fr) 2017-08-16

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