WO2016103908A1 - ヒータおよびこれを備えたグロープラグ - Google Patents
ヒータおよびこれを備えたグロープラグ Download PDFInfo
- Publication number
- WO2016103908A1 WO2016103908A1 PCT/JP2015/080580 JP2015080580W WO2016103908A1 WO 2016103908 A1 WO2016103908 A1 WO 2016103908A1 JP 2015080580 W JP2015080580 W JP 2015080580W WO 2016103908 A1 WO2016103908 A1 WO 2016103908A1
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- WIPO (PCT)
- Prior art keywords
- heating resistor
- semicircular
- ceramic body
- heater
- portions
- Prior art date
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- 239000000919 ceramic Substances 0.000 claims abstract description 84
- 238000010438 heat treatment Methods 0.000 claims abstract description 81
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- 229910052581 Si3N4 Inorganic materials 0.000 description 22
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 22
- 239000000463 material Substances 0.000 description 14
- 238000005219 brazing Methods 0.000 description 9
- 230000035882 stress Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- -1 Y 2 O 3 Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Images
Classifications
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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
-
- 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
- F23Q7/06—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs structurally associated with fluid-fuel burners
-
- 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
- H05B3/02—Details
- H05B3/06—Heater elements structurally combined with coupling elements or holders
-
- 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
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/148—Silicon, e.g. silicon carbide, magnesium silicide, heating transistors or diodes
-
- 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
- F23Q2007/002—Glowing plugs for internal-combustion engines with sensing means
-
- 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 present disclosure is, for example, a heater for ignition or flame detection in a combustion-type in-vehicle heating device, a heater for ignition of various combustion devices such as a petroleum fan heater, a heater for a glow plug of a diesel engine, and various sensors such as an oxygen sensor.
- the present invention relates to a heater used for a heater or a heater for heating a measuring instrument, and a glow plug including the heater.
- Patent Document 1 a ceramic heater disclosed in Japanese Patent Application Laid-Open No. 2007-240080 (hereinafter referred to as Patent Document 1) is known.
- the ceramic heater disclosed in Patent Document 1 includes a rod-shaped ceramic base and a heating element embedded in the base.
- the heating element has a pair of rod-like conductive portions extending in the axial direction, and the shape of the conductive portion when viewed in a cross section perpendicular to the axial direction is circular.
- the heater includes a rod-shaped ceramic body and a heating resistor provided inside the ceramic body, and the heating resistor is a semicircular shape that is bisected in the radial direction when viewed in cross section.
- the portion has at least one step portion on the outer peripheral portion due to the shape shifted along the radial direction.
- the glow plug is a heater having the above-described configuration, in which the heating resistor is located on one end side of the ceramic body, and a metal cylinder attached so as to cover the other end side of the ceramic body. It has.
- FIG. 2 is a cross-sectional view of the heater shown in FIG. 1 as seen in a cross section cut along the line AA ′. It is sectional drawing which shows the modification of a heater. It is sectional drawing which shows the modification of a heater. It is sectional drawing which shows the modification of a heater. It is a fragmentary sectional view which shows only a heating resistor among FIG. It is sectional drawing which shows the modification of a heater. It is sectional drawing which shows the modification of a heater. It is sectional drawing which shows an example of embodiment of a glow plug.
- the heater 1 includes a ceramic body 2, a heating resistor 3 embedded in the ceramic body 2, and leads 4 connected to the heating resistor 3 and drawn to the surface of the ceramic body 2. I have.
- the ceramic body 2 in the heater 1 is formed in a rod shape having a longitudinal direction, for example.
- a heating resistor 3 and leads 4 are embedded in the ceramic body 2.
- the ceramic body 2 is made of ceramics. Thereby, it becomes possible to provide the heater 1 with high reliability at the time of rapid temperature rise.
- the ceramic include electrically insulating ceramics such as oxide ceramics, nitride ceramics, and carbide ceramics.
- the ceramic body 2 is preferably made of silicon nitride ceramics. This is because silicon nitride ceramics is superior in terms of strength, toughness, insulating properties, and heat resistance.
- the ceramic body 2 made of silicon nitride ceramic is, for example, 3 to 12% by mass of a rare earth such as Y 2 O 3 , Yb 2 O 3 or Er 2 O 3 as a sintering aid with respect to silicon nitride as a main component.
- Element oxide, 0.5 to 3% by mass of Al 2 O 3 and SiO 2 are mixed so that the amount of SiO 2 contained in the sintered body is 1.5 to 5% by mass, and formed into a predetermined shape. Thereafter, it can be obtained by hot press firing at 1650 to 1780 ° C.
- the length of the ceramic body 2 is set to 20 to 50 mm, for example, and the diameter of the ceramic body 2 is set to 3 to 5 mm, for example.
- the thermal expansion coefficient of the silicon nitride ceramic that is the base material can be brought close to the thermal expansion coefficient of the heating resistor 3, and the durability of the heater 1 can be improved.
- the heating resistor 3 is provided inside the ceramic body 2.
- the heating resistor 3 is provided on the tip side (one end side) of the ceramic body 2.
- the heating resistor 3 is a member that generates heat when an electric current flows.
- the heating resistor 3 includes two straight portions 31 that extend along the longitudinal direction of the ceramic body 2 and a folded portion 32 that connects the two straight portions 31.
- a material for forming the heating resistor 3 a material mainly composed of carbide, nitride, silicide or the like such as W, Mo or Ti can be used.
- tungsten carbide (WC) is the heating resistor 3 among the above materials because it has a small difference in thermal expansion coefficient from the ceramic body 2 and high heat resistance. It is excellent as a material.
- the heating resistor 3 is mainly composed of WC of an inorganic conductor, and the content of silicon nitride added thereto is 20% by mass or more. preferable.
- the conductor component serving as the heating resistor 3 has a larger coefficient of thermal expansion than silicon nitride, and therefore is usually in a state where tensile stress is applied.
- the thermal expansion coefficient is brought close to that of the ceramic body 2, and the stress due to the difference between the thermal expansion coefficients when the heater 1 is heated and lowered is alleviated. can do.
- the content of silicon nitride contained in the heating resistor 3 is 40% by mass or less, the variation in the resistance value of the heating resistor 3 can be reduced. Therefore, the content of silicon nitride contained in the heating resistor 3 is preferably 20% by mass to 40% by mass. More preferably, the silicon nitride content is 25% by mass to 35% by mass. Further, as a similar additive to the heating resistor 3, boron nitride can be added in an amount of 4% by mass to 12% by mass instead of silicon nitride.
- the heating resistor 3 can have a total length of 3 to 15 mm and a cross-sectional area of 0.15 to 0.8 mm 2 .
- the heating resistor 3 has at least one pair of semicircular portions 33 bisected in the radial direction in the outer peripheral portion due to the shape shifted along the radial direction.
- a step 34 is provided.
- the “transverse section” is a section cut along a plane perpendicular to the longitudinal direction of the heating resistor 3.
- the semicircular portion 33 having the same size is shifted along the radial direction in both of the two linear portions 31. Therefore, there are two stepped portions 34 on the outer peripheral portion of each linear portion 31.
- the heating resistor 3 since the heating resistor 3 has the stepped portion 34 on the outer peripheral portion, a crack is temporarily generated between the heating resistor 3 and the ceramic body 2, and this crack is generated by the heating resistor 3 and the ceramic. Even if an attempt is made to proceed in the circumferential direction at the interface with the body 2, the progress of cracks can be suppressed by the stepped portion 34. As a result, it is possible to suppress the heat generated in the heating resistor 3 from being easily transmitted to the base.
- the “semicircular portion 33” here is not limited to one obtained by dividing a circle. An ellipse may be broken, or an ellipse may be broken. Further, a distorted circle may be broken. Further, “divided in the radial direction” here means a state in which the image is roughly divided in the center. When the chord lengths of the two semicircular portions 33 are the same, the two semicircular portions 33 can be shifted by, for example, 20 to 100 ⁇ m.
- the term “nothing” here is an expression used for convenience to express the shape of the heating resistor 3, and does not limit the method of manufacturing the heating resistor 3. That is, the heating resistor 3 does not have to be formed of two members, and may be formed integrally. Examples of a method for integrally forming the heating resistor 3 include injection molding.
- the stepped portion 34 is continuous along the longitudinal direction of the ceramic body 2. More specifically, two step portions 34 are provided on the entire two linear portions 31 of the heating resistor 3. Thereby, progress of a crack can be suppressed over a wide range.
- the heating resistor 3 has a stepped portion 34 at least inside the folded portion 32.
- the stepped portion 34 is located both inside and outside the folded portion 32.
- the step portions 34 provided on the inner side and the outer side of the folded portion 32 are continuous with the step portions 34 provided on the two linear portions 31 two by two.
- the inside of the turned-up portion 32 tends to accumulate heat and is particularly hot, so it is a portion that is particularly susceptible to thermal stress.
- the stepped portion 34 is provided outside the folded portion 32, the surface area of the heating resistor 3 in the region close to the surface of the ceramic body 2 can be increased. As a result, heat can be easily transferred to the surface of the ceramic body 2, so that the heating rate of the heater 1 can be improved.
- the semicircular portions 33 are shifted in both of the two linear portions 31, and the directions in which the semicircular portions 33 are shifted are opposite in the two linear portions 31. May be.
- the straight line portion 31 located on the left side is the first straight line portion 311 and the straight line portion 31 located on the right side is the second straight line portion 312
- the semicircular portion 33 located on the upper side in FIG. 3 is shifted to the left, and the semicircular portion 33 located on the lower side is shifted to the right.
- the semicircular part 33 located on the upper side in FIG. 3 is shifted to the right, and the semicircular part 33 located on the lower side is shifted to the left.
- the semicircular portion 33 is shifted in both of the two linear portions 31 and the direction in which the semicircular portions 33 are shifted in the two linear portions 31 is the arrangement direction of the two linear portions 31.
- the heating resistors 3 can be widely distributed. Thereby, the soaking
- the direction of deviation is the arrangement direction of the two linear portions 31” here does not have to be the same as the direction of deviation in the strict sense. Specifically, the direction of deviation may be shifted by about 30 ° with respect to the arrangement direction.
- the semicircular portion 33 is shifted in both of the two straight portions 31, and the first virtual line X connecting the two step portions 34 in the first straight portion 311, and the second The second virtual line Y connecting the two step portions 34 in the straight line portion 312 may intersect.
- the angle at which the first virtual line X and the second virtual line Y intersect can be set to 5 to 40 °, for example. In particular, the angle at which the first imaginary line X and the second imaginary line Y intersect is effectively 15 to 30 °.
- the semicircular portion 33 may have a first region 331 and a second region 332.
- the semicircular portion 33 shown in FIGS. 5 and 6 includes only the first region 331 and the second region 332.
- the first region 331 and the second region 332 each have a quarter-circle shape and are provided adjacent to each other.
- the first region 331 is a region located on the shifted side of the semicircular portion 33.
- the 1 ⁇ 4 circle shape here is not a 1 ⁇ 4 circle shape in a strict sense, but is not limited to a circle divided by 1 ⁇ 4.
- the ellipse may be divided by 1 ⁇ 4, or the ellipse may be divided by 1 ⁇ 4. Further, a distorted circle may be divided by 1/4.
- the first region 331 has a smaller radius of curvature than the second region 332.
- the first region 331 is a region located on the side of the heating resistor 3 on which the semicircular portion 33 is shifted. Thereby, it can reduce especially that the crack which arose in the front-end
- the tip portion of the step portion 34 means a corner portion of the semicircular portion 33 which is composed of an arc portion and a chord portion.
- the top part 333 of the arc of the half-circular part 33 divided into two parts may be shifted in the direction in which the semi-circular part 33 is shifted.
- the stepped portion 34 and the top portion 333 tend to concentrate stress.
- only one stepped portion 34 may be formed in one linear portion 31 as a result of the semicircular portions 33 having different sizes being displaced in the radial direction. Further, only one stepped portion 34 may be formed in the folded portion 32. Even in such a case, the progress of the crack can be suppressed by the step portion 34. As a result, it is possible to suppress the heat generated in the heating resistor 3 from being easily transmitted to the base.
- the tip portion of the stepped portion 34 may be R-shaped.
- the tip portion of the step portion 34 may be R-shaped.
- the radius of curvature can be set to 10 to 100 ⁇ m.
- the lead 4 is a member for electrically connecting the heating resistor 3 and an external power source.
- the lead 4 is connected to the heating resistor 3 and pulled out to the surface of the ceramic body 2.
- leads 4 are respectively joined to both ends of the heating resistor 3, and one lead 4 is connected to one end of the heating resistor 3 at one end side and is connected to the rear end of the ceramic body 2 at the other end side.
- the other lead 4 is connected to the other end of the heating resistor 3 on one end side and is led out from the rear end portion of the ceramic body 2 on the other end side.
- the lead 4 is formed using the same material as the heating resistor 3, for example.
- the lead 4 has a lower resistance per unit length by making the cross-sectional area larger than that of the heating resistor 3 or by making the content of the forming material of the ceramic body 2 smaller than that of the heating resistor 3. ing.
- WC is suitable as a material for the lead 4 in that the difference in thermal expansion coefficient from the ceramic body 2 is small, the heat resistance is high, and the specific resistance is small.
- the lead 4 is preferably composed of WC, which is an inorganic conductor, as a main component, and silicon nitride is added to the lead 4 so that the content is 15% by mass or more.
- the thermal expansion coefficient of the lead 4 can be made closer to the thermal expansion coefficient of silicon nitride constituting the ceramic body 2. Further, when the content of silicon nitride is 40% by mass or less, the resistance value of the lead 4 is lowered and stabilized. Accordingly, the silicon nitride content is preferably 15% by mass to 40% by mass. More preferably, the silicon nitride content is 20 mass% to 35 mass%.
- the glow plug 10 includes the heater 1 described above and a cylindrical metal cylinder 5 attached so as to cover the rear end side (the other end side) of the heater 1.
- an electrode fitting 6 that is disposed inside the metal tube 5 and is attached to the rear end of the heater 1 is provided. According to the glow plug 10, since the heater 1 described above is used, the progress of cracks at the interface between the heating resistor and the ceramic body is suppressed, so that durability can be improved. .
- the metal cylinder 5 is a member for holding the ceramic body 2.
- the metal cylinder 5 is a cylindrical member and is attached so as to surround the rear end side of the ceramic body 2. That is, the rod-shaped ceramic body 2 is inserted inside the cylindrical metal tube 5.
- the metal cylinder 5 is provided on the side surface on the rear end side of the ceramic body 2 and is electrically connected to a portion where the lead 4 is exposed.
- the metal cylinder 5 is made of, for example, stainless steel or iron (Fe) -nickel (Ni) -cobalt (Co) alloy.
- the metal cylinder 5 and the ceramic body 2 are joined by a brazing material.
- the brazing material is provided between the metal cylinder 5 and the ceramic body 2 so as to surround the rear end side of the ceramic body 2. By providing this brazing material, the metal cylinder 5 and the lead 4 are electrically connected.
- brazing material silver (Ag) -copper (Cu) brazing, Ag brazing, Cu brazing or the like containing 5 to 20% by mass of a glass component can be used. Since the glass component has good wettability with the ceramic of the ceramic body 2 and has a large coefficient of friction, the bonding strength between the brazing material and the ceramic body 2 or the bonding strength between the brazing material and the metal cylinder 5 can be improved.
- the electrode fitting 6 is located inside the metal cylinder 5 and attached to the rear end of the ceramic body 2 so as to be electrically connected to the lead 4.
- Various types of electrode fittings 6 can be used. However, in the example shown in FIG. 9, the cap part attached to cover the rear end of the ceramic body 2 including the lead 4 and the external connection electrode are electrically connected. It is the structure by which the coil-shaped part connected electrically is connected by the linear part.
- the electrode fitting 6 is held away from the inner peripheral surface of the metal cylinder 5 so as not to cause a short circuit with the metal cylinder 5.
- the electrode fitting 6 is a metal wire having a coil-shaped portion provided for stress relaxation in connection with an external power source.
- the electrode fitting 6 is electrically connected to the lead 4 and is electrically connected to an external power source. By applying a voltage between the metal cylinder 5 and the electrode fitting 6 by an external power source, a current can be passed through the heating resistor 3 via the metal cylinder 5 and the electrode fitting 6.
- the electrode fitting 6 is made of nickel or stainless steel, for example.
- the heater 1 can be formed by, for example, an injection molding method using a die having the shape of the heating resistor 3, the lead 4, and the ceramic body 2 having the above-described configuration.
- the heating resistor 3 first, two molded bodies having a semicircular cross section and having a straight portion and a folded portion are prepared. And after superimposing two molded objects so that a semicircle-shaped part may shift
- a conductive paste to be the heating resistor 3 and the lead 4 including the conductive ceramic powder and the resin binder is manufactured, and a ceramic paste to be the ceramic body 2 including the insulating ceramic powder and the resin binder is manufactured.
- a conductive paste molded body having a predetermined pattern to be the heating resistor 3 is formed by injection molding using the conductive paste.
- the heating resistor 3 having the stepped portion 34 can be formed by preparing a mold having a desired shape. Then, in a state where the heating resistor 3 is held in the mold, the conductive paste is filled in the mold to form a conductive paste molded body having a predetermined pattern to be the leads 4.
- the obtained molded body is fired at a temperature of 1650 ° C. to 1780 ° C. and a pressure of 30 MPa to 50 MPa, for example, so that the heater 1 can be manufactured.
- the firing is preferably performed by putting the molded body in a carbon mold and filling the carbon mold with carbon powder to reduce the influence of oxygen in the atmosphere. Further, the firing may be performed in a non-oxidizing gas atmosphere such as nitrogen gas or hydrogen gas.
- Heater 2 Ceramic body 3: Heating resistor 31: Linear portion 32: Folded portion 33: Semicircular portion 34: Stepped portion 4: Lead 5: Metal cylinder 6: Electrode fitting 10: Glow plug
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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Abstract
Description
2:セラミック体
3:発熱抵抗体
31:直線部
32:折返し部
33:半円状部
34:段差部
4:リード
5:金属筒
6:電極金具
10:グロープラグ
Claims (12)
- 棒状のセラミック体と、該セラミック体の内部に設けられた発熱抵抗体とを備えており、該発熱抵抗体は、横断面で見たときに、径方向で二分された半円状部が前記径方向に沿ってずれた形状によって外周部に少なくとも1つの段差部を有するヒータ。
- 前記発熱抵抗体は、前記段差部が長手方向に連続している請求項1に記載のヒータ。
- 前記発熱抵抗体は、折返し部を有しているとともに、該折返し部分の内側に前記段差部が位置している請求項1または請求項2に記載のヒータ。
- 前記発熱抵抗体は、前記段差部の先端部分がR形状である請求項1乃至請求項3のいずれかに記載のヒータ。
- 前記発熱抵抗体が前記セラミック体の長手方向に沿って伸びる2つの直線部と、前記2つの直線部を連結する折返し部を有しており、
前記2つの直線部の両方において前記半円状部がずれているとともに、前記2つの直線部における前記半円状部のずれる方向が前記2つの直線部の配列方向である請求項1乃至請求項4のいずれかに記載のヒータ。 - 前記半円状部のずれる方向が前記2つの直線部間で逆方向になっている請求項5に記載のヒータ。
- 前記発熱抵抗体が前記セラミック体の長手方向に沿って伸びる第1直線部および第2直線部と、前記第1直線部および前記第2直線部を連結する折返し部を有しており、
前記第1直線部は前記段差部を2つ有しており、前記第1直線部の前記2つの段差部を結ぶ仮想線を第1仮想線とし、
前記第2直線部は前記段差部を2つ有しており、前記第2直線部の前記2つの段差部を結ぶ仮想線を第2仮想線としたときに、
前記第1仮想線と前記第2仮想線とが交差している請求項1乃至請求項6のいずれかに記載のヒータ。 - 前記半円状部が、それぞれ1/4円状の第1領域および第2領域を有するとともに、前記第1領域は前記第2領域と比較して曲率半径が小さい請求項1乃至請求項7に記載のヒータ。
- 前記第1領域が、前記発熱抵抗体のうち前記半円状部のずれた側に位置している領域である請求項8に記載のヒータ。
- 前記2分された半円状部それぞれの弧の頂部が、前記半円状部がずれた方向にずれて位置している請求項1乃至請求項9のいずれかに記載のヒータ。
- 前記半円状部の弧の頂部から前記半円状部の弦と垂直に交わる仮想線を引き、前記仮想線と前記半円状部の弦との交わる点を基準点としたときに、前記基準点が前記半円状部の弦の中心よりも、前記半円状部がずれた側に位置している請求項1乃至請求項10のいずれかに記載のヒータ・
- 請求項1乃至請求項11のいずれかに記載のヒータであって前記発熱抵抗体が前記セラミック体の一端側に位置しているヒータと、前記セラミック体の他端側を覆うように取り付けられた金属筒とを備えたグロープラグ。
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CN201580069837.4A CN107211492B (zh) | 2014-12-25 | 2015-10-29 | 加热器以及具备其的电热塞 |
EP15872477.3A EP3240357B1 (en) | 2014-12-25 | 2015-10-29 | Heater and glow plug equipped with same |
DE212015000019.2U DE212015000019U1 (de) | 2014-12-25 | 2015-10-29 | Heizer und Glühkerze mit dem Heizer |
JP2016511843A JP6023389B1 (ja) | 2014-12-25 | 2015-10-29 | ヒータおよびこれを備えたグロープラグ |
US15/537,950 US10533744B2 (en) | 2014-12-25 | 2015-10-29 | Heater and glow plug equipped with same |
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JPWO2016103908A1 (ja) | 2017-04-27 |
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EP3240357B1 (en) | 2020-09-09 |
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US20170350596A1 (en) | 2017-12-07 |
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