EP3396250B1 - Glühkerze - Google Patents

Glühkerze Download PDF

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Publication number
EP3396250B1
EP3396250B1 EP18165741.2A EP18165741A EP3396250B1 EP 3396250 B1 EP3396250 B1 EP 3396250B1 EP 18165741 A EP18165741 A EP 18165741A EP 3396250 B1 EP3396250 B1 EP 3396250B1
Authority
EP
European Patent Office
Prior art keywords
heat
section
generation
cross
glow plug
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18165741.2A
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English (en)
French (fr)
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EP3396250A1 (de
Inventor
Hirofumi Okada
Makoto EJIRI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
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
Priority claimed from JP2017249216A external-priority patent/JP6960848B2/ja
Application filed by NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Publication of EP3396250A1 publication Critical patent/EP3396250A1/de
Application granted granted Critical
Publication of EP3396250B1 publication Critical patent/EP3396250B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • the present invention relates to a glow plug.
  • thermal performance may vary among individual glow plugs.
  • W tungsten
  • resistance ratio the ratio of the resistance of the heat generation element at 1,000°C to the resistance of the heat generation element at 20°C. If the resistance of the heat generation element at room temperature varies among individual glow plugs, the resistance of the heat generation element when energized varies more greatly among individual glow plugs, and consequently, thermal performance may vary among individual glow plugs.
  • the heat generation element is inserted into a fusion zone at the forward end of a tubular member and is joined to the tubular member through the fusion zone.
  • the resistance of the heat generation element at room temperature may vary among individual glow plugs.
  • the forward end of the tubular member is melted and then solidified to thereby fix the heat generation element in the fusion zone.
  • the amount of the melted material of the tubular member may vary among individual glow plugs.
  • the present invention has been conceived to solve the above problem and an object of the present invention is to reduce variation in thermal performance among individual glow plugs.
  • the wall thickness of the tubular member between the forward end of the heat generation element and the surface of the tubular member can be rendered sufficiently large. As a result, it is possible to prevent exposure of the heat generation element, which would otherwise occur when the tubular member wears.
  • the glow plug can simultaneously achieve reduction of thermal performance variation and improvement of durability.
  • FIG. 1 shows a glow plug 10.
  • the glow plug 10 includes a sheath heater (heat generation device) 800 for generating heat and functions as a heat source for assisting ignition at startup of an internal combustion engine (not shown) such as a diesel engine.
  • the glow plug 10 includes the sheath heater 800, an axial rod 200, and a metallic shell 500. These component members of the glow plug 10 are assembled together along the axial direction OD of the glow plug 10.
  • FIG. 1 shows an external structure on the right side of an axial line O and a sectional structure on the left side of the axial line O.
  • a side toward the sheath heater 800 in the glow plug 10 is called the "forward side”
  • a side toward an engagement member 100 is called the "rear side.”
  • the metallic shell 500 is a tubular member formed of carbon steel.
  • the metallic shell 500 holds the sheath heater 800 at a forward end portion thereof.
  • the metallic shell 500 holds the axial rod 200 at a rear end portion thereof through an insulation member 410 and an O-ring 460.
  • the position of the insulation member 410 along the axial line O is fixed as a result of a ring 300 in contact with the rear end of the insulation member 410 being crimped to the axial rod 200.
  • a portion of the axial rod 200 extending from the insulation member 410 to the sheath heater 800 is disposed in an axial hole 510 of the metallic shell 500.
  • the axial hole 510 is a through hole formed along the axial line O and is greater in diameter than the axial rod 200.
  • the metallic shell 500 further includes a tool engagement portion 520 and an external thread portion 540.
  • a tool (not shown) is engaged with the tool engagement portion 520 of the metallic shell 500 for attaching and detaching the glow plug 10.
  • the external thread portion 540 meshes with an internal thread formed in an internal combustion engine (not shown).
  • the axial rod 200 is a circular columnar (rodlike) member formed of an electrically conductive material. While being inserted through the axial hole 510 of the metallic shell 500, the axial rod 200 is disposed in position along the axial line O.
  • the axial rod 200 includes a forward end portion 210 formed at the forward end side and an external thread portion 290 provided at the rear end side. The forward end portion 210 is inserted into the sheath heater 800. The external thread portion 290 protrudes rearward from the metallic shell 500. The engagement member 100 meshes with the external thread portion 290.
  • FIG. 2 is a sectional view showing the structure of a sheath heater 800 in detail.
  • the sheath heater 800 includes a sheath tube 810, a heat generation coil 820, a rear coil 830, and an insulator 870.
  • the heat generation coil 820 is also called the "forward end coil.”
  • the heat generation coil 820 corresponds to the coiled heat generation element of the present invention.
  • the sheath tube 810 is a tubular member extending in the axial direction OD and having a closed forward end and corresponds to the tubular member of the present invention.
  • the sheath tube 810 accommodates therein the heat generation coil 820, the rear coil 830, and the insulator 870.
  • the sheath tube 810 includes a side portion 814 extending in the axial direction OD, a forward end portion 813 connected to the forward end of the side portion 814 and curved outward, and a rear end portion 819 opening in a direction opposite the forward end portion 813.
  • the forward end portion 210 of the axial rod 200 is inserted into the sheath tube 810 from the rear end portion 819.
  • the sheath tube 810 is electrically insulated from the axial rod 200 by a packing 600 and the insulator 870. Meanwhile, the sheath tube 810 is in contact with the metallic shell 500 to thereby be electrically connected to the metallic shell 500.
  • the sheath tube 810 is formed of, for example, austenitic stainless steel which contains iron (Fe), chromium (Cr), and carbon (C), or a nickel (Ni)-based alloy such as INCONEL 601 (INCONEL is a registered trademark) or Alloy602 (corresponding to DIN2.4633 alloy specified by German Industrial Standard (DIN)).
  • the insulator 870 is formed of powder of an electrical insulation material.
  • magnesium oxide (MgO) powder is used as the insulator 870.
  • the insulator 870 is filled into (disposed in) a gap which remains in the sheath tube 810 as a result of disposition of the axial rod 200, the heat generation coil 820, and the rear coil 830 in the sheath tube 810, thereby providing electrical insulation in the gap.
  • the heat generation coil 820 is disposed in the sheath tube 810 along the axial direction OD and generates heat by energization thereof.
  • the heat generation coil 820 includes a forward end portion 822, which is a forward coil end portion, and a rear end portion 829, which is a rear coil end portion.
  • the forward end portion 822 is located in the forward end portion 813 of the sheath tube 810 and electrically connected to the sheath tube 810.
  • the rear end portion 829 is electrically connected to the rear coil 830 through a connection 840 formed as a result of welding of the heat generation coil 820 and the rear coil 830.
  • the main component of the heat generation coil 820 is tungsten (W).
  • the main component is a substance whose content (% by mass) is 50% by mass or higher.
  • the tungsten (W) content of the heat generation coil 820 is 99% by mass or higher.
  • the wire diameter of the heat generation coil 820 is preferably 0.1 mm to 0.25 mm.
  • the rear coil 830 includes a forward end portion 831, which is a forward coil end portion, and a rear end portion 839, which is a rear coil end portion.
  • the forward end portion 831 is welded to the rear end portion 829 of the heat generation coil 820 to thereby be electrically connected to the heat generation coil 820.
  • the rear end portion 839 is joined to the forward end portion 210 of the axial rod 200 to thereby be electrically connected to the axial rod 200.
  • the rear coil 830 is formed of, for example, a nickel (Ni)-chromium (Cr) alloy or an iron (Fe)-chromium (Cr)-aluminum (Al) alloy.
  • the resistance R 20 of the glow plug 10 at 20°C is 0.6 ⁇ or less.
  • the resistance R 20 of the glow plug 10 at 20°C is the sum of the resistance of the heat generation coil 820 at 20°C and the resistance of the rear coil 830 at 20°C.
  • the resistance R 20 of the glow plug 10 at 20°C is 0.4 ⁇ .
  • a resistance ratio R1 which is the ratio of the resistance R1 1000 of the heat generation coil 820 at 1,000°C to the resistance R1 20 of the heat generation coil 820 at 20°C and a resistance ratio R2 which is the ratio of the resistance R2 1000 of the rear coil 830 at 1,000°C to the resistance R2 20 of the rear coil 830 at 20°C satisfy a relation of R1 > R2.
  • FIG. 3 is a sectional view showing the forward end portion 813 of the sheath tube 810 and its periphery. The forward end of the sheath tube 810 is closed with the fusion zone 891.
  • FIG. 3 shows a cross section of the glow plug 10 taken along the axial line O of the glow plug 10 such that the same number of cross sections of the heat generation coil 820 appear in the fusion zone 891 on opposite sides of the axial line O.
  • the right side of the axial line O is taken as one side of the axial line O, and the left side is taken as the other side.
  • two cross sections of the heat generation coil 820 appear in the fusion zone 891 on each of opposite sides of the axial line O.
  • FIG. 3 shows the heat generation coil 820, the sheath tube 810, and the insulator 870, which are cut along a plane passing through the axial line O.
  • the fusion zone 891 of the sheath tube 810 contains columnar crystals (dendrite), whereas a base metal portion 893 other than the fusion zone 891 has a microstructure different from that of the fusion zone 891.
  • Examples of the microstructure of the base metal portion 893 include a fibrous microstructure and a forged microstructure.
  • the microstructure can be identified as columnar crystals, a fibrous microstructure, or a forged microstructure by a publicly known metal microstructure observation method; specifically, by electrolytic etching of a cut surface in an oxalate solution (JIS G 5071 2012), for example.
  • n turns (n is a natural number) of the heat generation coil 820 are inserted into the fusion zone 891.
  • two turns of the heat generation coil 820 at the forward end are inserted into the fusion zone 891.
  • the first turn 901 and the second turn 902 appear in this order from the forward end side (lower side in the drawing) on opposite sides of the axial line O.
  • the third turn 903 and the fourth turn 904 appear in this order from the forward end side (lower side in the drawing) on the opposite sides of the axial line O.
  • the rearmost one of the cross sections of the heat generation coil 820 appearing in the fusion zone 891 on one side of the axial line O will be referred to as a first heat-generation-element cross section 902a.
  • a cross section which is one of the cross sections of the heat generation coil 820 appearing in the fusion zone 891 on the one side of the axial line O and which is located immediately forward of the first heat-generation-element cross section 902a will be referred to as a fourth heat-generation-element cross section 901a.
  • the forwardmost one of the cross sections of the heat generation coil 820 appearing externally of the fusion zone 891 on the one side of the axial line O will be referred to as a second heat-generation-element cross section 903a.
  • a cross section which is one of the cross sections of the heat generation element 820 appearing externally of the fusion zone 891 on the one side of the axial line O and which is located immediately rearward of the second heat-generation-element cross section 903a will be referred to as a third heat-generation-element cross section 904a.
  • a distance A between the first heat-generation-element cross section 902a and the second heat-generation-element cross section 903a is rendered greater than a distance B between the second heat-generation-element cross section 903a and the third heat-generation-element cross section 904a.
  • the distance A is preferably greater than 0.2 mm and not greater than 0.6 mm.
  • the distance B is preferably not less than 0.1 mm and not greater than 0.2 mm.
  • the distance A i.e., space
  • the distance A i.e., space
  • the distance A is increased such that the rear end surface 895 of the fusion zone 891 is disposed in the space. Accordingly, even when the amount of the melted material of the sheath tube 810 varies and thus the position of the rear end surface 895 of the fusion zone 891 varies in the axial direction, the rear end surface 895 can be positioned between the first heat-generation-element cross section 902a and the second heat-generation-element cross section 903a without fail.
  • the distance A and the distance B satisfy the following relational expression. 1.30 ⁇ A / B ⁇ 4.00
  • A/B is equal to or greater than 1.30, the variation in thermal performance among individual glow plugs can be suppressed.
  • A/B is equal to or less than 4.00, the glow plug 10 can have sufficiently high heat-up performance.
  • a distance C between the fourth heat-generation-element cross section 901a and the first heat-generation-element cross section 902a is equal to or less than the distance B.
  • the distance C between the fourth heat-generation-element cross section 901a and the first heat-generation-element cross section 902a is preferably not less than 0 mm and not greater than 0.10 mm.
  • the distance C By setting the distance C to be equal to or less than the distance B, the wall thickness of the sheath tube 810 between the forward end of the heat generation coil 820 and the surface of the sheath tube 810 (thickness indicated by symbol D in FIG. 3 ) can be rendered sufficiently large. As a result, it is possible to prevent exposure of the coil 820 which would otherwise occur when the sheath tube 810 wears, whereby durability can be improved.
  • Aglow plug 10 of another (second) embodiment will be described with reference to FIG. 7 .
  • constituent members or portions of the glow plug 10 of the second embodiment which are approximately the same as those of the glow plug 10 of the above-described embodiment are denoted by like reference numerals, and description of their structures, actions, and effects is omitted.
  • the radially outermost end 901aa of the fourth heat-generation-element cross section 901a is located inward of the radially innermost end 902aa of the first heat-generation-element cross section 902a.
  • the glow plug 10 of the second embodiment differs from the glow plug 10 of the above-described embodiment in the following point.
  • the rearmost end 901ab of the fourth heat-generation-element cross section 901a is located rearward of the forwardmost end 902ab of the first heat-generation-element cross section 902a.
  • the fourth heat-generation-element cross section 901a and the first heat-generation-element cross section 902a are disposed to overlap each other in the axial direction OD.
  • FIG. 4 is a flowchart showing a method of manufacturing the glow plug 10.
  • the heat generation coil 820 and the axial rod 200 are welded together (step S10).
  • the heat generation coil 820 and the rear coil 830 are welded together; further, the rear end portion 839 of the rear coil 830 and the forward end portion 210 of the axial rod 200 are welded together.
  • the forward end portion 822 of the heat generation coil 820 and the forward end portion 813 of the sheath tube 810 are welded together (step S20).
  • Step S20 is also called the "welding process.”
  • FIGS. 5(a) and 5(b) are explanatory views showing a welding process in step S20.
  • a sheath tube 810P which includes a forward end portion 813P having an opening 815 and which is shaped such that diameter gradually reduces toward the opening 815.
  • the forward end portion 822 of the heat generation coil 820 is disposed inside the forward end portion 813P of the prepared sheath tube 810P such that the second turn 822P of the heat generation coil 820 comes into contact with the sheath tube 810P ( FIG. 5(a) ).
  • the forward end portion 813P is melted by, for example, arc welding from outside and then is solidified to close the opening 815
  • the forward end portion 822 of the heat generation coil 820 and the forward end portion 813 of the sheath tube 810 are welded together ( FIG. 5(b) ).
  • the forward end portion 822 of the heat generation coil 820 is surrounded by and embedded in the forward end portion 813 of the sheath tube 810.
  • output of the welding machine, welding time, etc. are adjusted such that the heat generation coil 820 and the sheath tube 810 are welded together at a temperature lower than the melting point of the heat generation coil 820 and higher than the melting point of the sheath tube 810.
  • the thickness of an alloy portion formed of the alloy is 10 ( ⁇ m) or less.
  • the thickness of the alloy portion can be calculated by detecting the alloy portion through analysis of a region in the vicinity of the boundary between the forward end portion 822 of the heat generation coil 820 and the forward end portion 813 of the sheath tube 810 by use of, for example, EPMA (Electron Probe Micro Analyzer).
  • EPMA Electro Probe Micro Analyzer
  • the insulator 870 is filled into the sheath tube 810 (step S30).
  • the insulator 870 covers the heat generation coil 820, the rear coil 830, and the axial rod 200 to thereby fill a gap formed in the sheath tube 810, whereby assembly of the sheath heater 800 is completed.
  • swaging is performed on the sheath heater 800 (step S40). Swaging is performed such that striking force is applied to the sheath heater 800 to thereby reduce the diameter of the sheath heater 800, so as to densify the insulator 870 filled into the sheath tube 810.
  • striking force is applied to the sheath heater 800 as a result of swaging, the striking force is transmitted to the interior of the sheath heater 800, thereby densifying the insulator 870.
  • step S50 After swaging is performed on the sheath heater 800, the sheath heater 800 and the metallic shell 500 are combined to thereby assemble the glow plug 10 (step S50), whereby the glow plug 10 is completed.
  • the sheath heater 800 integrated with the axial rod 200 is fixedly press-fitted into the axial hole 510 of the metallic shell 500; the O-ring 460 and the insulation member 410 are fitted to the axial rod 200 at a rear end portion of the metallic shell 500; and the engagement member 100 is meshed with the external thread portion 290 of the axial rod 200 located rearward of the rear end of the metallic shell 500.
  • step S50 aging is performed on the glow plug 10. Specifically, the assembled glow plug 10 is energized so that the sheath heater 800 generates heat, thereby forming an oxide film on the outer surface of the sheath heater 800.
  • experimental examples 2 to 6 are examples of the present invention, and experimental example 1 is a comparative example.
  • the forward end shape of the heat generation coil 820 was adjusted so as to adjust the distance A, the distance B, and the distance C.
  • Other conditions are as follows:
  • the sheath heater 800 was cut such that the region where the forward end portion 831 of the rear coil 830 and the rear end portion 829 of the heat generation coil 820 are welled together appeared on the cut surface on the left side (on the other side), and the clearances between the cross sections of the heat generation coil 820 were measured on the cut surface on the right side (on one side).
  • the rated voltage was determined as follows. Namely, the voltage sensitivity of the first glow plug for each experimental example was measured, the relation between voltage and temperature was determined, and a voltage at which the temperature becomes 1,100°C was used as the rated voltage.
  • the temperature was measured at a position located 2 mm from the forward end of the sheath tube 810 by use of a PR thermocouple (platinum-platinum rhodium thermocouple) and a radiation thermometer.
  • PR thermocouple platinum-platinum rhodium thermocouple
  • radiation thermometer a radiation thermometer
  • a voltage for increasing the glow plug temperature by 1,000°C in two seconds was applied to each glow plug 10; then, a voltage for saturating the glow plug temperature at 1,100°C was applied to each glow plug 10 continuously for 180 seconds. Subsequently, each glow plug 10 was cooled by wind for 120 seconds for lowering the glow plug temperature to room temperature. With this procedure taken as one cycle, a cycle test was conducted. Each glow plug 10 was subjected to 7,000 test cycles. Each glow plug 10 was evaluated on the basis of the results of the determination as to whether or not a wire breakage occurred during the durability test.
  • the temperature was measured at a position located 2 mm from the forward end of the sheath tube 810 by use of a PR thermocouple (platinum-platinum rhodium thermocouple) and a radiation thermometer.
  • PR thermocouple platinum-platinum rhodium thermocouple
  • radiation thermometer a radiation thermometer
  • a voltage of 11 V was applied to each glow plug 10 for 2 seconds, and its temperature after elapse of 2 seconds was measured.
  • the temperature was measured at a position located 2 mm from the forward end of the sheath tube 810 by use of a PR thermocouple (platinum-platinum rhodium thermocouple) and a radiation thermometer.
  • PR thermocouple platinum-platinum rhodium thermocouple
  • the rapid heat-up performance was evaluated as follows.
  • Table 1 shows the test results.
  • Table 1 Experimental example A (mm) B (mm) C (mm) A/B C/B Temp. variation Durability Rapid heat-up performance 1 0.10 0.10 0.07 1.00 0.700 X X (1) ⁇ 2 0.13 0.10 0.07 1.30 0.700 ⁇ ⁇ ⁇ 3 0.40 0.10 0.07 4.00 0.700 ⁇ ⁇ ⁇ 4 0.45 0.10 0.07 4.50 0.700 ⁇ ⁇ X 5 0.50 0.10 0.10 5.00 1.000 ⁇ ⁇ ⁇ 6 0.50 0.10 0.13 5.00 1.300 ⁇ X (2) ⁇ (1) The heat generation coil came off the sheath tube. (2) The forward end of the heat generation coil was exposed from the forward end of the sheath tube.

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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)

Claims (4)

  1. Glühkerze (10), umfassend:
    ein rohrförmiges Element (810), dessen vorderes Ende mit einer Schmelzzone (891) verschlossen ist, und
    ein gewickeltes Wärmeerzeugungselement (820), das im rohrförmigen Element (810) angeordnet ist und W als eine Hauptkomponente enthält,
    wobei ein vorderer Endabschnitt des Wärmeerzeugungselements (820) in die Schmelzzone (891) eingeschoben wird, um dadurch mit dem rohrförmigen Element (810) verbunden zu werden; und
    in einem Querschnitt der Glühkerze (10) entlang einer Axiallinie (O) der Glühkerze (10),
    mit einem Querschnitt, der ein hinterster von Querschnitten des Wärmeerzeugungselements (820) ist, die in der Schmelzzone (891) auf einer Seite der Axiallinie (O) auftreten und der mindestens teilweise innerhalb der Schmelzzone (891) angeordnet ist, definiert als ein erster Wärmeerzeugungselement-Querschnitt (902a),
    mit einem vordersten der Querschnitte des Wärmeerzeugungselements (820), die außerhalb der Schmelzzone (891) auf der einen Seite der Axiallinie (O) auftreten, definiert als zweiter Wärmeerzeugungselement-Querschnitt (903a), und
    mit einem Querschnitt, der einer der Querschnitte des Wärmeerzeugungselements (820) ist, die außerhalb der Schmelzzone (891) auf der einen Seite der Axiallinie (O) auftreten und der unmittelbar hinter dem zweiten Wärmeerzeugungselement-Querschnitt (903a) liegt, definiert als ein dritter Wärmeerzeugungselement-Querschnitt (904a),
    dadurch gekennzeichnet, dass
    ein Abstand A in Richtung der Axiallinie (O) zwischen einem hintersten Ende des ersten Wärmeerzeugungselement-Querschnitts (902a) und einem vordersten Ende des zweiten Wärmeerzeugungselement-Querschnitts (903a) größer ist als ein Abstand B in Richtung der Axiallinie (O) zwischen einem hintersten Ende des zweiten Wärmeerzeugungselement-Querschnitts (903a) und einem vordersten Ende des dritten Wärmeerzeugungselement-Querschnitts (904a).
  2. Glühkerze nach Anspruch 1, wobei der Abstand A und der Abstand B einen Vergleichsausdruck von 1,30≤A/B≤4,00 erfüllen.
  3. Glühkerze nach Anspruch 1 oder 2, wobei
    im Querschnitt der Glühkerze (10),
    mit einem Querschnitt, der einer der Querschnitte des Wärmeerzeugungselements (820) ist, die in der Schmelzzone (891) auf der einen Seite der Axiallinie (O) auftreten, und der unmittelbar vor dem ersten Wärmeerzeugungselement-Querschnitt (902a) liegt, definiert als ein vierter Wärmeerzeugungselement-Querschnitt (901a),
    ein Abstand C in Richtung der Axiallinie (O) zwischen einem hintersten Ende des vierten Wärmeerzeugungselement-Querschnitts (901a) und einem vordersten Ende des ersten Wärmeerzeugungselement-Querschnitts (902a) (einschließlich des Falls, in dem C = 0) gleich oder kleiner als der Abstand B ist.
  4. Glühkerze nach Anspruch 1 oder 2, wobei
    im Querschnitt der Glühkerze (10),
    mit einem Querschnitt, der einer der Querschnitte des Wärmeerzeugungselements (820) ist, die in der Schmelzzone (891) auf der einen Seite der Axiallinie (O) auftreten und der unmittelbar vor dem ersten Wärmeerzeugungselement-Querschnitt (902a) angeordnet ist, definiert als ein vierter Wärmeerzeugungselement-Querschnitt (901a),
    ein radial äußerstes Ende des vierten Wärmeerzeugungselement-Querschnitts (901a) nach innen von einem radial innersten Ende des ersten Wärmeerzeugungselement-Querschnitts (902a) liegt, und
    ein hinterstes Ende des vierten Wärmeerzeugungselement-Querschnitts (901a) hinter einem vordersten Ende des ersten Wärmeerzeugungselement-Querschnitts (902a) liegt.
EP18165741.2A 2017-04-24 2018-04-04 Glühkerze Active EP3396250B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017085047 2017-04-24
JP2017249216A JP6960848B2 (ja) 2017-04-24 2017-12-26 グロープラグ

Publications (2)

Publication Number Publication Date
EP3396250A1 EP3396250A1 (de) 2018-10-31
EP3396250B1 true EP3396250B1 (de) 2019-12-04

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Family Applications (1)

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EP18165741.2A Active EP3396250B1 (de) 2017-04-24 2018-04-04 Glühkerze

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB859659A (en) * 1958-06-07 1961-01-25 Bosch Gmbh Robert Improvements in glow plugs for internal combustion engines
JPS5821A (ja) * 1981-06-24 1983-01-05 Ngk Spark Plug Co Ltd シ−ズ型グロ−プラグのシ−ズチユ−ブ先端部の溶接方法
JP2852552B2 (ja) * 1990-04-16 1999-02-03 自動車機器株式会社 シーズヒータおよびその製造方法
JP5255706B2 (ja) * 2010-06-22 2013-08-07 日本特殊陶業株式会社 グロープラグ及びその製造方法、並びに、加熱装置
DE102013212283A1 (de) 2013-06-26 2014-12-31 Robert Bosch Gmbh Glührohr für eine regelbare Glühstiftkerze

Non-Patent Citations (1)

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

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