EP3333483B1 - Glühkerze - Google Patents

Glühkerze Download PDF

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Publication number
EP3333483B1
EP3333483B1 EP17200876.5A EP17200876A EP3333483B1 EP 3333483 B1 EP3333483 B1 EP 3333483B1 EP 17200876 A EP17200876 A EP 17200876A EP 3333483 B1 EP3333483 B1 EP 3333483B1
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EP
European Patent Office
Prior art keywords
coil
tube
resistance value
temperature
end coil
Prior art date
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Active
Application number
EP17200876.5A
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English (en)
French (fr)
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EP3333483A1 (de
Inventor
Hirofumi Okada
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
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Filing date
Publication date
Priority claimed from JP2017145147A external-priority patent/JP6931566B2/ja
Application filed by NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Publication of EP3333483A1 publication Critical patent/EP3333483A1/de
Application granted granted Critical
Publication of EP3333483B1 publication Critical patent/EP3333483B1/de
Active legal-status Critical Current
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    • 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, and in particular, to a glow plug that can realize increase in heating temperature.
  • a glow plug is used as an auxiliary heat source of an internal combustion engine such as a compression ignition-type diesel engine.
  • the glow plug is required to have a property of raising the temperature thereof to a predetermined temperature in a short time period (hereinafter, referred to as "rapid temperature rising property").
  • the glow plug is also required to have increased heating temperature.
  • WO-A1- 2014/206847 and EP-A1-2587156 disclose a technology in which, in order to meet the demand for increasing the heating temperature, in a glow plug having a coil joined to the front end of a center rod, a heat resistant metal of which principal component is W or Mo that has a higher melting point than a FeCrAI alloy or a NiCr alloy is used for the coil.
  • US-A1-2004/206742 discloses a glow plug on which the precharacterizing portion of claim 1 is based.
  • a resistance ratio of the heat resistant metal such as W or Mo is greater than a resistance ratio of the NiCr alloy.
  • the resistance ratio is the "ratio of the resistance value at 1000°C of a coil relative to the resistance value at 20°C of the coil", and the greater the value of the resistance ratio is, the greater the resistance value at a high temperature is. Since the heat generation amount is proportional to the square of the current value, there is a problem that the temperature is difficult to be raised to a predetermined temperature in a short time period, and that the rapid temperature rising property is not realized.
  • An object of the present invention is to provide a glow plug that can suppress temperature decrease when the applied voltage is lowered in order to saturate the temperature, while ensuring increased heating temperature and the rapid temperature rising property.
  • the present invention provides a glow plug as defined b claim 1.
  • the proportion of the resistance value at 20°C between the front end of the tube and a position of the front end coil at 4 mm from the front end of the tube toward the rear side in the axis direction is 55% to 80%.
  • the heat generation amount of the portion up to 4 mm of the front end coil can be made greater than the heat generation amount of the other portion of the front end coil. Therefore, the temperature of the portion up to 4 mm of the front end coil can be rapidly raised, and thus, the rapid temperature rising property can be ensured.
  • the other portion of the front end coil generates heat in accordance with the proportion of the resistance value (20% to 45%).
  • the applied voltage is lowered, the amount of heat that is transferred from the portion up to 4 mm of the front end coil to the rear side can be suppressed.
  • temperature decrease when the applied voltage is lowered in order to saturate the temperature can be suppressed.
  • W or Mo as a principal component means that the total content of W or Mo relative to the entire content of the coil material is not less than 50 wt%.
  • the resistance value between the front end of the tube and the rear end of the front end coil is not greater than 0.13 ⁇ .
  • the front end coil has a uniform composition from the front end thereof to the rear end thereof, and a pitch at the front side of the front end coil is smaller than a pitch at the rear side of the front end coil. Accordingly, in addition to the effect obtained by the first or second aspect, the structure of the front end coil can be simplified.
  • a resistance value at 20°C between the front end of the tube and the rear end of the rear end coil is not greater than 0.36 ⁇ .
  • the length in the axis direction from the front end of the tube to the rear end of the front end coil is not less than 6 mm and not greater than 11 mm. Therefore, in addition to the effect obtained by any of the first to fourth aspects, the proportion of the resistance value of the portion up to 4 mm of the front end coil can be easily set.
  • the outer diameter of the tube from the front end of the tube to a position at 4 mm from the front end of the tube toward the rear side in the axis direction is not greater than 3.5 mm.
  • FIG. 1 is a diagram of the glow plug 10 with a half side thereof shown in a cross section.
  • FIG. 2 is a partial enlarged cross-sectional view of the glow plug 10.
  • the lower side of the drawing sheet is referred to as the front side of the glow plug 10
  • the upper side of the drawing sheet is referred to as the rear side of the glow plug 10.
  • the glow plug 10 includes a center rod 20, a metal shell 30, a tube 40, and a coil 50. These members are assembled along an axis O of the glow plug 10.
  • the glow plug 10 is an auxiliary heat source to be used at the time of starting an internal combustion engine (not shown), including, for example, a diesel engine.
  • the center rod 20 is a metal conductor having a columnar shape, and serves as a member for supplying electric power to the coil 50.
  • the coil 50 is electrically connected to the front end of the center rod 20.
  • the center rod 20 is inserted in the metal shell 30, with the rear end thereof protruding from the metal shell 30.
  • a connecting portion 21 composed of an external thread is formed at the rear end of the center rod 20.
  • An O-ring 22 made of insulating rubber, an insulator 23 which is a tubular member made of synthetic resin, a ring 24 which is a tubular member made of metal, and a nut 25 made of metal are assembled to the rear end of the center rod 20 in this order from the front side.
  • the connecting portion 21 is a portion to which a connector (not shown) of a cable that supplies electric power from a power source such as a battery is connected.
  • the nut 25 is a member for fixing the connected connector (not shown).
  • the metal shell 30 is a substantially cylindrical member formed from carbon steel or the like.
  • the metal shell 30 has an axial hole 31 penetrated therethrough along the axis O, and has a thread portion 32 formed on the outer peripheral surface thereof.
  • a tool engagement portion 33 is formed at the rear side relative to the thread portion 32.
  • the axial hole 31 is a through hole in which the center rod 20 is inserted. Since the inner diameter of the axial hole 31 is greater than the outer diameter of the center rod 20, a void is formed between the center rod 20 and the axial hole 31.
  • the thread portion 32 is an external thread fitted to an internal combustion engine (not shown).
  • the tool engagement portion 33 is a portion having a shape (e.g., a hexagonal shape) engageable with a tool (not shown) that is used to fit or remove the thread portion 32 to or from a threaded hole (not shown) of the internal combustion engine.
  • a shape e.g., a hexagonal shape
  • the metal shell 30 holds the center rod 20 through the O-ring 22 and the insulator 23 at the rear side of the axial hole 31.
  • the ring 24 being crimped to the center rod 20 with the insulator 23 in contact with the ring 24, the position, in the axial direction, of the insulator 23 is fixed.
  • the rear side of the metal shell 30 and the ring 24 are insulated from each other by the insulator 23.
  • the metal shell 30 has the tube 40 fixed at the front side thereof in the axial hole 31.
  • the tube 40 is a metal tubular body having a front end 41 which is closed.
  • the tube 40 is fixed to the metal shell 30 by being press-fitted into the axial hole 31.
  • Examples of the material of the tube 40 include heat resistant alloys such as a nickel-based alloy and stainless steel.
  • the front side of the center rod 20 is inserted in the tube 40. Since the inner diameter of the tube 40 is greater than the outer diameter of the center rod 20, a void is formed between the center rod 20 and the tube 40.
  • a sealing member 42 is a cylindrical insulating member sandwiched between the front side of the center rod 20 and the rear end of the tube 40. The sealing member 42 maintains the interval between the center rod 20 and the tube 40, and seals the space between the center rod 20 and the tube 40.
  • the coil 50 is housed in the tube 40 along the axis O.
  • An insulating powder 60 is filled in the tube 40.
  • the coil 50 is formed in a spiral shape and generates heat by current being applied thereto.
  • the coil 50 includes: a front end coil 51 joined to the front end 41 of the tube 40; and a rear end coil 52 joined to the front end of the center rod 20.
  • the front end of the front end coil 51 is joined to the front end 41 of the tube 40 by welding.
  • the front end coil 51 is formed from a high-melting-point metal containing W or Mo as a principal component. An elementary substance of either of these elements, or an alloy using either of these elements as a principal component can be used as the front end coil 51.
  • the rear end of the front end coil 51 is joined to the rear end coil 52 by welding.
  • a melt portion 53 which is a weld metal melted during the welding and solidified is formed between the front end coil 51 and the rear end coil 52.
  • the rear end coil 52 is a member connected in series to the front end coil 51 through the melt portion 53.
  • the rear end coil 52 is formed from a conductive material that has a resistance ratio R2 smaller than a resistance ratio R1 of the front end coil 51. Examples of the material of the rear end coil 52 include a FeCrAI alloy, and a NiCr alloy.
  • the rear end coil 52 is housed in the tube 40 along the axis O, and the rear end of the rear end coil 52 is joined to the front end of the center rod 20 by welding.
  • the center rod 20 is electrically connected to the tube 40 through the rear end coil 52 and the front end coil 51.
  • the insulating powder 60 is a powder that has electrical insulation property and that has thermal conductivity under high temperature.
  • the insulating powder 60 is filled between the coil 50 and the tube 40, between the center rod 20 and the tube 40, and inside the coil 50.
  • the insulating powder 60 has a function of causing heat to be transferred from the coil 50 to the tube 40, a function of preventing short circuit between the coil 50 and the tube 40, and a function of making the coil 50 less liable to vibrate thereby preventing disconnection.
  • the insulating powder 60 include oxide powders such as MgO powder and Al 2 O 3 powder.
  • powders such as CaO or ZrO 2 powder and SiO 2 or Si powder can be added.
  • the insulating powder 60 contains an MgO powder by not less than 85 mass% and less than 100 mass% relative to the total mass of the insulating powder 60, and also contains an Si powder.
  • the front end coil 51 is composed of: a first portion 54 extending from the front end 41 of the tube 40 to a position separated by 4 mm from the front end 41 of the tube 40 toward the rear side in the axis O direction; and a second portion 55 extending from the rear end (the position separated by 4 mm from the front end 41 of the tube 40 toward the rear side in the axis O direction) of the first portion 54 to the melt portion 53.
  • the resistance value at 20°C between the front end 41 of the tube 40 and the rear end (the melt portion 53) of the front end coil 51 is set to be not greater than 0.13 ⁇ . It should be noted that the resistance value is a value measured by a four-terminal method.
  • the proportion of the resistance value at 20°C of the first portion 54 is set to 55% to 80%
  • the proportion of the resistance value at 20°C of the second portion 55 is set to 20% to 45%.
  • the resistance value at 20°C between the front end 41 of the tube 40 and the rear end (the welded portion between the rear end coil 52 and the center rod 20) of the rear end coil 52 is set to be not greater than 0.36 ⁇ . In the present embodiment, the resistance value at 20°C between the front end 41 of the tube 40 and the rear end of the rear end coil 52 is set to be not less than 0.29 ⁇ .
  • the length in the axis O direction from the front end 41 of the tube 40 to the melt portion 53 is set to be not less than 6 mm and not greater than 11 mm.
  • the front end coil 51 has a uniform composition from the front end 41 to the melt portion 53 except the front end 41 of the tube 40 and the weld metal of the melt portion 53, and the proportions of the resistance values of the first portion 54 and the second portion 55 are set by making the pitch at the front side of the front end coil 51 smaller than the pitch at the rear side of the front end coil 51. Accordingly, the structure of the front end coil 51 can be simplified.
  • the means for setting the proportions of the resistance values of the first portion 54 and the second portion 55 is not limited to the means for adjusting the pitch of the front end coil 51.
  • Examples of another means for setting the proportions of the resistance values include: means for making the wire diameter at the front side of the front end coil 51 smaller than the wire diameter at the rear side thereof; and means for producing the front end coil 51 by joining in series two coils made of materials having different specific resistances at 20°C and then joining the coil having the higher specific resistance to the front end 41 of the tube 40.
  • the resistance value at the front side of the front end coil 51 can be made higher than the resistance value at the rear side thereof, and thus, the proportion of the resistance value of the first portion 54 can be made greater than the proportion of the resistance value of the second portion 55.
  • FIG. 3 is a schematic diagram showing the relationship between the voltage V and the heating temperature T of the glow plug 10.
  • the horizontal axis represents time (seconds)
  • the solid line indicates the heating temperature T
  • the broken line indicates the voltage V.
  • the resistance value R 1 at 20°C of the front end coil 51 is not greater than 0.13 ⁇ , the current I that flows in the front end coil 51 at the time of heat generation can be ensured without extremely increasing the voltage that is applied between the connecting portion 21 and the metal shell 30. Thus, the heat generation amount of the front end coil 51 can be ensured.
  • the resistance value R 2 at 20°C of the rear end coil 52 is set to a value greater than the resistance value R 1 at 20°C of the front end coil 51 (specifically, not less than 0.06 ⁇ ). This is for ensuring the current I (rush current) flowing in the coil 50 at normal temperature, to cause the coil 50 to generate heat.
  • the resistance value R 1 of the front end coil 51 becomes greater than the resistance value R 2 of the rear end coil 52 in association with temperature rise due to heat generation by the coil 50.
  • the heat generation amount R 1 ⁇ I 2 per unit time of the front end coil 51 can be made greater than the heat generation amount R 2 ⁇ I 2 per unit time of the rear end coil 52.
  • the heating temperature T can be increased.
  • the proportion of the resistance value at 20°C of the first portion 54 in the front end coil 51 relative to the resistance value R 1 at 20°C of the front end coil 51 is 55% to 80%, and thus, the heat generation amount of the first portion 54 can be made greater than the heat generation amount of the second portion 55.
  • the heating temperature T of the first portion 54 can be rapidly raised to a desired temperature (e.g., 1000°C), and the rapid temperature rising property can be ensured.
  • the voltage V applied to the glow plug 10 is lowered in order to bring the heating temperature T to a saturation temperature (e.g., 1100°C) realized during stable operation. Since the heat generation amount of the rear end coil 52 is smaller than the heat generation amount of the front end coil 51, during transition in which the voltage V is lowered, heat of the front end coil 51 is transferred to the rear end coil 52. As a result, the heating temperature T highly depending on the front end coil 51 temporarily decreases by a temperature D. If the temperature D increases and the heating temperature T greatly decreases, combustion of the engine becomes unstable, and emission of exhaust gas is increased.
  • a saturation temperature e.g. 1100°C
  • the proportion of the resistance value at 20°C of the second portion 55 in the front end coil 51 is set to 20% to 45%.
  • the second portion 55 generates heat in accordance with the proportion (20% to 45%) of the resistance value thereof relative to that of the front end coil 51.
  • the amount of heat can be suppressed that is to be transferred from the first portion 54 to the second portion 55 when the voltage V is lowered for making transition to the saturation state.
  • the temperature decrease (temperature D) during transition in which the voltage V is lowered in order to saturate the heating temperature T can be suppressed.
  • the glow plug 10 can assist combustion of the engine and stabilize idling operation of the started engine, and in addition, can reduce emission of exhaust gas.
  • the resistance value at 20°C between the front end 41 of the tube 40 and the rear end of the rear end coil 52 i.e., the resistance value at 20°C of the coil 50
  • the resistance value at 20°C of the coil 50 is set to be not greater than 0.36 ⁇
  • the value of current flowing in the front end coil 51 can be ensured. Since the heat generation amount of the front end coil 51 can be ensured, the rapid temperature rising property can be ensured.
  • the first portion 54 of the front end coil 51 rapidly generates heat due to application of voltage, and further, temperature decrease of the first portion 54 during transition to the saturation state can be suppressed. Therefore, power saving of the glow plug 10 can be realized.
  • the resistance value at 20°C between the front end 41 of the tube 40 and the rear end of the rear end coil 52 i.e., the resistance value at 20°C of the coil 50
  • the resistance value at 20°C of the coil 50 is set to be not less than 0.29 ⁇
  • the value of current at the time of rush can be regulated.
  • an extremely large rush current can be prevented from flowing in a controller (not shown) that controls the glow plug 10, and thus, the controller can be protected.
  • a protective resistance can be provided separately from the glow plug 10.
  • the resistance value at 20°C of the glow plug 10 may not be necessarily set to be not less than 0.29 ⁇ .
  • the protective resistance can be omitted, and thus, the number of components can be reduced, accordingly.
  • the length in the axis O direction from the front end 41 of the tube 40 to the melt portion 53 is set to be not less than 6 mm and not greater than 11 mm. Accordingly, the developed length of the front end coil 51 can be set appropriately. As a result, while the resistance value of the front end coil 51 is prevented from becoming extremely large, the proportion of the resistance value of the first portion 54 relative to the resistance value of the front end coil 51 can be easily set.
  • the insulating powder 60 contains an Si powder, the thermal conductivity of the insulating powder 60 can be decreased when compared with a case where the entirety of the insulating powder 60 is an MgO powder. As a result, heat dissipation of the first portion 54 due to heat conduction of the insulating powder 60 can be suppressed. Thus, by causing heat generation from the front end 41 of the tube 40, the insulating powder 60 helps ensuring the rapid temperature rising property at the time of rush and suppressing the temperature decrease during transition.
  • the glow plug 10 is produced in the following manner, for example. First, a resistance heating wire having a predetermined composition is processed into a coil shape, and from the coil-shaped resistance heating wire, the front end coil 51 and the rear end coil 52 are produced. Next, end portions of the front end coil 51 and the rear end coil 52 are joined together by welding, to form the coil 50. Next, the rear end coil 52 in the coil 50 is joined to the front end of the center rod 20.
  • a metal steel pipe having a predetermined composition is formed such that the diameter thereof is larger than the final dimension of the tube 40, and such that a front end of the metal steel pipe has a diameter smaller than the diameters of other portions, whereby a tapered-off tube precursor having an open front end is produced.
  • the coil 50 integrated with the center rod 20 is inserted in the tube precursor, and the front end of the coil 50 is disposed in the tapered-off opening portion of the tube precursor.
  • the opening portion of the tube precursor and the front end portion of the coil 50 are melted by welding to close the front end portion of the tube precursor, whereby a heater precursor having the coil 50 housed therein is formed.
  • the sealing member 42 is inserted between the opening portion at the rear end of the tube 40 and the center rod 20, so as to seal the tube 40.
  • swaging is performed on the tube 40 until the tube 40 has a predetermined outer diameter.
  • the tube 40 having been subjected to the swaging is fixed by being press-fitted into the axial hole 31 of the metal shell 30, and the O-ring 22 and the insulator 23 are fitted between the metal shell 30 and the center rod 20 from the rear end of the center rod 20.
  • the center rod 20 is crimped with the ring 24, whereby the glow plug 10 is obtained.
  • Example The present invention is further described in detail by use of Example. However, the present invention is not limited to this Example.
  • front end coils 51 were created that each had an entire length of 6 mm to 11 mm, and that had various proportions of the resistance values at 20°C of the first portion 54 and the second portion 55.
  • various rear end coils 52 were created.
  • Various coils 50 in which the rear end coil 52 and the front end coil 51 were connected in series were each created by joining the rear end coil 52 to the front end coil 51 by welding.
  • glow plugs each having a structure similar to that of the glow plug 10 shown in FIG. 1 were produced in the manner as described above, whereby the glow plugs of samples 1 to 10 shown in Table 1 were obtained.
  • an MgO powder containing an Si powder by 0.2 mass% was used as the insulating powder 60.
  • the outer diameter of the tube 40 was set to be not greater than ⁇ 3.5 mm (that is, the outer diameter of the portion, outside the first portion 54 of the coil 50, of the tube 40 (the portion from the front end 41 of the tube 40 to the position at 4 mm from the front end 41 of the tube 40 toward the rear side) was set to be not greater than ⁇ 3.5 mm).
  • a PR thermocouple was joined at a position on the surface of the tube 40 separated by 2 mm in the axis O direction from the front end 41 of the tube 40 of each sample, and the temperature in the vicinity of the front end 41 of the tube 40 was measured. It should be noted that a radiation thermometer may be used instead of the PR thermocouple.
  • the tube 40 of each sample in which the temperature measurement had been finished was cut to be opened in the axis O direction, the insulating powder 60 filled in the tube 40 was removed, and the coil 50 in a state where both ends thereof were joined to the front end 41 of the tube 40 and the center rod 20 was exposed.
  • the resistance value at 20°C of each of the following portions (1) to (4) was measured: (1) the front end coil 51 between the front end 41 of the tube 40 and the melt portion 53; (2) the first portion 54 between the front end 41 of the tube 40 and the position separated by 4 mm in the axis O direction from the front end 41 of the tube 40; (3) the second portion 55 between the position separated by 4 mm in the axis O direction from the front end 41 of the tube 40 and the melt portion 53; and (4) the coil 50 between the front end 41 of the tube 40 and the rear end (the front end of the center rod 20) of the rear end coil 52.
  • Front end coils 51 were created in a manner similar to that for sample 3.
  • Various rear end coils 52 were created by use of a wire made of a NiCr alloy.
  • Various coils 50 in which the rear end coil 52 and the front end coil 51 were connected in series were each created by joining the rear end coil 52 to the front end coil 51 by welding. The numbers of turn times of the rear end coil 52 was adjusted, whereby the resistance value at 20°C of the coil 50 was adjusted.
  • the method for measuring the resistance value was the same as that described with regard to samples 1 to 10, and the resistance value was measured after the temperature measurement for each sample was finished.
  • a PR thermocouple was joined at a position on the surface of the tube 40 separated by 2 mm in the axis O direction from the front end 41 of the tube 40 of each sample, and the temperature in the vicinity of the front end 41 of the tube 40 was measured. It should be noted that a radiation thermometer may be used instead of the PR thermocouple.
  • the present invention has been described on the basis of the embodiment and Example, the present invention is not limited to the above embodiment and Example at all. It is easily understood that various improved modifications can be made without departing from the gist of the present invention.
  • the shape of the tube 40 is not limited in particular as long as the shape is tubular, and the shape thereof in cross-section perpendicular to the axis O may be circular, elliptical, polygonal, or the like.
  • the wire diameter and the diameter of the coil 50, and the thickness and the diameter of the tube 40 can be set as appropriate in consideration of the heat capacity, etc. of the coil 50 and the tube 40.
  • the present invention is not limited thereto.
  • the inner diameter of the metal shell 30 need not be made small in accordance with the outer diameter at the front end 41 side of the tube 40.
  • the front end of the center rod 20 is inserted into the rear side of the tube 40, the diameter of the center rod 20 need not be made small in accordance with the inner diameter of the rear side of the tube 40. That is, the outer diameter of the center rod 20 and the inner diameter of the metal shell 30 can be set irrespectively of the outer diameter at the front end 41 side of the tube 40, and thus, the degrees of freedom in design of the center rod 20 and the metal shell 30 can be ensured.

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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 (6)

  1. Glühkerze (10), umfassend:
    eine Mittelstange (20), die aus Metall hergestellt ist und sich in eine Achsen (O) - Richtung erstreckt;
    eine Spule (50), die elektrisch mit einem vorderen Ende der Mittelstange (20) verbunden ist; und
    ein Rohr (40), das aus Metall hergestellt ist und ein vorderes Ende hat, das verschlossen ist, wobei das Rohr (40) die Spule (50) und eine vordere Seite der Mittelstange (20) aufnimmt und die Spule (50) damit elektrisch verbunden hat, wobei
    die Spule (50) eine Spule des vorderen Endes (51) hat, die elektrisch mit einem vorderen Ende (41) des Rohrs (40) verbunden ist, und eine Spule des hinteren Endes (52), die elektrisch mit einem hinteren Ende (53) der Spule des vorderen Endes (51) verbunden ist,
    ein Widerstandsverhältnis R1 und ein Widerstandsverhältnis R2 die Beziehung R1>R2 erfüllen, wobei das Widerstandsverhältnis R1 ein Verhältnis eines Widerstandswerts bei 1000 °C der Spule des vorderen Endes (51) relativ zu einem Widerstandswert bei 20 °C der Spule des vorderen Endes (51) ist, wobei das Widerstandsverhältnis R2 ein Verhältnis eines Widerstandswerts bei 1000 °C der Spule des hinteren Endes (52) relativ zu einem Widerstandswert bei 20 °C der Spule des hinteren Endes (52) ist; dadurch gekennzeichnet, dass:
    die Spule des vorderen Endes (51) W oder Mo als eine Hauptkomponente davon enthält; und
    relativ zu einem Widerstandswert bei 20 °C zwischen dem vorderen Ende (41) des Rohrs (40) und dem hinteren Ende (53) der Spule des vorderen Endes (51) ein Anteil eines Widerstandswerts bei 20 °C zwischen einer Position der Spule des vorderen Endes (51) bei 4 mm von dem vorderen Ende (41) des Rohrs (40) zu einer hinteren Seite in der Achsen (O) - Richtung und dem vorderen Ende (41) des Rohrs (40) 55 % bis 80 % beträgt.
  2. Glühkerze (10) nach Anspruch 1, wobei
    der Widerstandswert zwischen dem vorderen Ende (41) des Rohrs (40) und dem hinteren Ende (53) der Spule des vorderen Endes (51) nicht größer als 0,13 Ω ist.
  3. Glühkerze (10) nach Anspruch 1 oder 2, wobei
    die Spule des vorderen Endes (51) eine gleichförmige Zusammensetzung von einem vorderen Ende davon zu dem hinteren Ende (53) davon hat, und eine Steigung an einer vorderen Seite der Spule des vorderen Endes (51) kleiner als eine Steigung an einer hinteren Seite der Spule des vorderen Endes (51) ist.
  4. Glühkerze (10) nach einem der Ansprüche 1 bis 3, wobei
    ein Widerstandswert bei 20 °C zwischen dem vorderen Ende (41) des Rohrs (40) und einem hinteren Ende der Spule des hinteren Endes (52) nicht größer als 0,36 Ω ist.
  5. Glühkerze (10) nach einem der Ansprüche 1 bis 4, wobei
    eine Länge in der Achsen (O) -Richtung von dem vorderen Ende (41) des Rohrs (40) zu dem hinteren Ende (53) der Spule des vorderen Endes (51) nicht kleiner als 6 mm und nicht größer als 11 mm ist.
  6. Glühkerze (10) nach einem der Ansprüche 1 bis 5, wobei
    ein Außendurchmesser des Rohrs (40) von dem vorderen Ende (41) des Rohrs (40) zu einer Position bei 4 mm von dem vorderen Ende (41) des Rohrs (40) zu der hinteren Seite in der Achsen (O) -Richtung nicht größer als 3,5 mm ist.
EP17200876.5A 2016-12-12 2017-11-09 Glühkerze Active EP3333483B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016240059 2016-12-12
JP2017145147A JP6931566B2 (ja) 2016-12-12 2017-07-27 グロープラグ

Publications (2)

Publication Number Publication Date
EP3333483A1 EP3333483A1 (de) 2018-06-13
EP3333483B1 true EP3333483B1 (de) 2020-08-12

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EP17200876.5A Active EP3333483B1 (de) 2016-12-12 2017-11-09 Glühkerze

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DE3911506A1 (de) * 1989-04-08 1990-10-11 Bosch Gmbh Robert Gluehstiftkerze
US6878903B2 (en) * 2003-04-16 2005-04-12 Fleming Circle Associates, Llc Glow plug
WO2008126171A1 (ja) * 2007-03-12 2008-10-23 Ngk Spark Plug Co., Ltd. グロープラグの製造方法及びグロープラグ
US20090184101A1 (en) * 2007-12-17 2009-07-23 John Hoffman Sheathed glow plug
EP2587156B1 (de) * 2010-06-22 2019-04-17 NGK Spark Plug Company Limited Glühkerze, herstellungsverfahren dafür und erhitzungsvorrichtung damit
DE102013212283A1 (de) 2013-06-26 2014-12-31 Robert Bosch Gmbh Glührohr für eine regelbare Glühstiftkerze

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