JP2021125326A - Heater and glow plug including the same - Google Patents

Heater and glow plug including the same Download PDF

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JP2021125326A
JP2021125326A JP2020016708A JP2020016708A JP2021125326A JP 2021125326 A JP2021125326 A JP 2021125326A JP 2020016708 A JP2020016708 A JP 2020016708A JP 2020016708 A JP2020016708 A JP 2020016708A JP 2021125326 A JP2021125326 A JP 2021125326A
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insulating substrate
heater
longitudinal direction
resistor
heat generating
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JP7369633B2 (en
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貴史 宮口
Takashi Miyaguchi
貴史 宮口
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Kyocera Corp
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Abstract

To provide a heater having a small size and a small diameter that has improved long-term reliability in electrical connection with an external device, such as an external power supply.SOLUTION: A heater 1 comprises: an insulating substrate 10 and a heat element. The insulating substrate 10 is a rod-like member having one end 11 and the other end. The heat element has a linear shape including a bent part and has a first end 21 and a second end. When the insulating substrate 10 in the longitudinal direction from one end 11 of the insulating substrate 10, the centroid of the first end 21 and the centroid of the insulating substrate 10 are shifted from each other.SELECTED DRAWING: Figure 2

Description

本開示は、例えば燃焼式車載暖房装置における点火用もしくは炎検知用のヒータ、石油ファンヒータ等の各種燃焼機器における点火用のヒータ、ディーゼルエンジンのグロープラグ用のヒータ、酸素センサ等の各種センサ用のヒータまたは測定機器における加熱用のヒータ等に利用されるヒータに関する。また、本開示は、上記のヒータを備えたグロープラグに関する。 The present disclosure relates to, for example, a heater for ignition or flame detection in a combustion type in-vehicle heating device, a heater for ignition in various combustion devices such as an oil 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 in a measuring device. The present disclosure also relates to glow plugs provided with the above heaters.

グロープラグ等に用いられるヒータは、絶縁性セラミックから成る円柱状の基体と、導電性セラミックから成り、基体に埋設された線状の発熱抵抗体とを備えている（例えば、特許文献１を参照）。発熱抵抗体は、外部電源との電気的接続のために、両端が基体の外周面に導出されている。 A heater used for a glow plug or the like includes a columnar substrate made of an insulating ceramic and a linear heat generating resistor made of a conductive ceramic and embedded in the substrate (see, for example, Patent Document 1). ). Both ends of the heat generation resistor are led out to the outer peripheral surface of the substrate for electrical connection with an external power source.

特開２０１８−１０７１７号公報JP-A-2018-10717

近年、急速な昇降温または高温での昇降温を繰り返すような過酷な使用環境でも長期間使用できる、小型かつ小径のヒータが求められている。従来のヒータは、発熱抵抗体の両端を基体の外周面に導出する構成であり、そのような構成のヒータを小型化および小径化することは難しかった。また、発熱抵抗体の一端を基体の端面に導出することにより、ヒータを小型化および小径化することが可能になるが、その場合、基体と発熱抵抗体との熱膨張差に起因する応力が発熱抵抗体の一端に集中し、発熱抵抗体の一端にクラックが発生し、発熱抵抗体が断線する虞があった。 In recent years, there has been a demand for a small-sized and small-diameter heater that can be used for a long period of time even in a harsh usage environment in which rapid ascending / descending temperature or ascending / descending temperature at a high temperature is repeated. The conventional heater has a configuration in which both ends of the heat generating resistor are led out to the outer peripheral surface of the substrate, and it has been difficult to reduce the size and diameter of the heater having such a configuration. Further, by leading one end of the heat generation resistor to the end face of the substrate, it is possible to reduce the size and diameter of the heater, but in that case, the stress due to the difference in thermal expansion between the substrate and the heat generation resistor is increased. Concentrated on one end of the heat generation resistor, cracks were generated at one end of the heat generation resistor, and there was a risk that the heat generation resistor would be disconnected.

本開示のヒータは、棒状の絶縁基体と、
前記絶縁基体に埋設され、第１端が前記絶縁基体の一端部に露出しているとともに、前記絶縁基体の長手方向に見たときに、前記第１端の図心と前記絶縁基体の図心とがずれている発熱抵抗体と、を備える。 The heater of the present disclosure includes a rod-shaped insulating substrate and
It is embedded in the insulating substrate, the first end is exposed at one end of the insulating substrate, and the center of gravity of the first end and the center of gravity of the insulating substrate when viewed in the longitudinal direction of the insulating substrate. It is provided with a heat generating resistor that is out of alignment.

また、本開示のグロープラグは、上記のヒータと、
前記発熱抵抗体の前記第２端に電気的に接続されるとともに前記ヒータを保持する金属製保持部材と、を備える。 In addition, the glow plug of the present disclosure includes the above heater and
A metal holding member that is electrically connected to the second end of the heat generation resistor and holds the heater is provided.

本開示のヒータによれば、外部電源等の外部装置との電気的接続の長期信頼性が向上した、小型かつ小径のヒータを提供することができる。また、本開示のグロープラグによれば、外部電源等の外部装置との電気的接続の長期信頼性が向上した、小型かつ小径のグロープラグを提供することができる。 According to the heater of the present disclosure, it is possible to provide a small-sized and small-diameter heater having improved long-term reliability of electrical connection with an external device such as an external power supply. Further, according to the glow plug of the present disclosure, it is possible to provide a small and small diameter glow plug having improved long-term reliability of electrical connection with an external device such as an external power supply.

本開示の一実施形態に係るヒータを示す断面図である。It is sectional drawing which shows the heater which concerns on one Embodiment of this disclosure. 図１のヒータの平面図である。It is a top view of the heater of FIG. 本開示の他の実施形態に係るヒータを示す断面図である。It is sectional drawing which shows the heater which concerns on other embodiment of this disclosure. 図３のヒータの平面図である。It is a top view of the heater of FIG. 本開示の他の実施形態に係るヒータを示す断面図である。It is sectional drawing which shows the heater which concerns on other embodiment of this disclosure. 図５のヒータの平面図である。It is a top view of the heater of FIG. 本開示の一実施形態に係るグロープラグを示す断面図である。It is sectional drawing which shows the glow plug which concerns on one Embodiment of this disclosure.

以下、本開示のヒータの実施形態について、図面を用いて詳細に説明する。 Hereinafter, embodiments of the heater of the present disclosure will be described in detail with reference to the drawings.

図１は、本開示の一実施形態に係るヒータを示す断面図であり、図２は、図１のヒータの平面図である。図１は、本実施形態のヒータを絶縁基体の長手方向に沿って切断した断面を示している。図２は、図１のヒータを、絶縁基体の一端部側から絶縁基体の長手方向に見た平面図を示している。 FIG. 1 is a cross-sectional view showing a heater according to an embodiment of the present disclosure, and FIG. 2 is a plan view of the heater of FIG. FIG. 1 shows a cross section of the heater of the present embodiment cut along the longitudinal direction of the insulating substrate. FIG. 2 shows a plan view of the heater of FIG. 1 as viewed from one end side of the insulating substrate in the longitudinal direction of the insulating substrate.

本実施形態のヒータ１は、絶縁基体１０と発熱抵抗体２０とを備えている。 The heater 1 of the present embodiment includes an insulating substrate 10 and a heat generating resistor 20.

絶縁基体１０は、一端部１１および他端部１２を有する棒状の部材である。絶縁基体１０は、例えば、丸棒状の形状を有していてもよく、四角形棒状、六角形棒状等の多角形棒状の形状を有していてもよい。本実施形態では、絶縁基体１０は、丸棒状の形状を有している。また、絶縁基体１０は、例えば図１に示すように、他端部１２が半球状になっていてもよい。 The insulating substrate 10 is a rod-shaped member having one end 11 and the other end 12. The insulating substrate 10 may have, for example, a round rod shape, or may have a polygonal rod shape such as a quadrangular rod shape or a hexagonal rod shape. In the present embodiment, the insulating substrate 10 has a round bar shape. Further, as shown in FIG. 1, for example, the other end portion 12 of the insulating substrate 10 may be hemispherical.

絶縁基体１０は、絶縁材料から成る。絶縁基体１０は、例えば、電気絶縁性のセラミック材料から成る。絶縁基体１０に用いられるセラミック材料としては、例えば、酸化物セラミックス、窒化物セラミックス、炭化物セラミックスまたは窒化珪素質セラミックス等が挙げられる。絶縁基体１０が丸棒状の形状を有する場合、絶縁基体１０は、例えば、長さが２０〜１２０ｍｍであり、直径が２〜６ｍｍである。 The insulating substrate 10 is made of an insulating material. The insulating substrate 10 is made of, for example, an electrically insulating ceramic material. Examples of the ceramic material used for the insulating substrate 10 include oxide ceramics, nitride ceramics, carbide ceramics, silicon nitride ceramics and the like. When the insulating substrate 10 has a round bar shape, the insulating substrate 10 has, for example, a length of 20 to 120 mm and a diameter of 2 to 6 mm.

発熱抵抗体２０は、通電によって発熱する部材であり、絶縁基体１０に埋設されている。本実施形態では、発熱抵抗体２０は、例えば図１に示すように、屈曲部を含む線形状を有し、第１端２１および第２端２２を有している。発熱抵抗体２０は、その横断面が、例えば、円形状、楕円形状、多角形状等の形状を有している。なお、本実施形態において、「横断面」は、発熱抵抗体２０の自身が延びる方向に直交する断面を指す。 The heat generation resistor 20 is a member that generates heat when energized, and is embedded in the insulating substrate 10. In the present embodiment, the heat generating resistor 20 has a linear shape including a bent portion, and has a first end 21 and a second end 22, as shown in FIG. 1, for example. The heat generation resistor 20 has a cross section having, for example, a circular shape, an elliptical shape, a polygonal shape, or the like. In the present embodiment, the “cross section” refers to a cross section orthogonal to the direction in which the heat generating resistor 20 itself extends.

本実施形態では、例えば図１，２に示すように、第１端２１が絶縁基体１０の一端部１１に露出しており、第２端２２が、絶縁基体１０の外周部１３に露出している。これにより、絶縁基体１０（すなわち、ヒータ１）を小型化および小径化しつつ、第１端２１と第２端２２との絶縁距離を確保して、第１端２１と第２端２２との間で絶縁破壊が生じる虞を低減できる。 In the present embodiment, for example, as shown in FIGS. 1 and 2, the first end 21 is exposed to one end portion 11 of the insulating substrate 10, and the second end 22 is exposed to the outer peripheral portion 13 of the insulating substrate 10. There is. As a result, while reducing the size and diameter of the insulating substrate 10 (that is, the heater 1), the insulation distance between the first end 21 and the second end 22 is secured, and between the first end 21 and the second end 22. It is possible to reduce the risk of dielectric breakdown.

発熱抵抗体２０は、例えば、全長が４０〜２５０ｍｍであり、横断面の面積が０．０００１〜２ｍｍ２である。発熱抵抗体２０は、タングステン、モリブデン、チタン等の炭化物、窒化物または珪化物等を主成分とすることができる。発熱抵抗体２０は、絶縁基体１０の形成材料を含有していてもよい。 The heat generation resistor 20 has, for example, a total length of 40 to 250 mm and a cross-sectional area of 0.0001 to 2 mm 2. The heat generation resistor 20 can be mainly composed of a carbide such as tungsten, molybdenum, or titanium, a nitride, or a silicified product. The heat generation resistor 20 may contain a material for forming the insulating substrate 10.

本実施形態では、例えば図２に示すように、絶縁基体１０の一端部１１側から、絶縁基体１０の長手方向に見たときに、第１端２１の図心Ｃ２１と絶縁基体１０の図心Ｃ１０とがずれている。これにより、急速な昇降温または高温での昇降温を繰り返すヒートサイクル下において、絶縁基体１０と発熱抵抗体２０との熱膨張差に起因する応力が第１端２１に集中することを抑制でき、その結果、第１端２１にクラックが生じる虞を低減できる。ひいては、外部電源等の外部装置との電気的接続の長期信頼性が向上したヒータを提供することができる。 In the present embodiment, for example, as shown in FIG. 2, when viewed from one end 11 side of the insulating substrate 10 in the longitudinal direction of the insulating substrate 10, the centroid C21 of the first end 21 and the centroid of the insulating substrate 10 It is out of alignment with C10. As a result, it is possible to prevent stress due to the difference in thermal expansion between the insulating substrate 10 and the heat generating resistor 20 from concentrating on the first end 21 under a heat cycle in which rapid elevating temperature or elevating temperature at a high temperature is repeated. As a result, the possibility of cracking at the first end 21 can be reduced. As a result, it is possible to provide a heater having improved long-term reliability of electrical connection with an external device such as an external power supply.

図心Ｃ２１と図心Ｃ１０との距離は、絶縁基体１０の長手方向に見たときに、例えば、絶縁基体１０の直径の０％より大きく２０％より小さくてもよく、絶縁基体１０の直径の５％より大きく１５％より小さくてもよく、絶縁基体１０の直径の１０％程度であってもよい。図心Ｃ２１と図心Ｃ１０との距離がこれらの範囲にある場合、絶縁基体１０と発熱抵抗体２０との熱膨張差に起因する応力が第１端２１に集中することを効果的に抑制できる。さらに、一端部１１における第１端２１の露出位置が外周部１３側に偏り過ぎることによる、絶縁基体１０の強度低下を抑制できる。 The distance between the center C21 and the center C10 may be larger than 0% and smaller than 20% of the diameter of the insulating base 10 when viewed in the longitudinal direction of the insulating base 10, for example, the diameter of the insulating base 10. It may be larger than 5% and smaller than 15%, and may be about 10% of the diameter of the insulating substrate 10. When the distance between the center of gravity C21 and the center of gravity C10 is within these ranges, it is possible to effectively suppress the concentration of stress due to the difference in thermal expansion between the insulating substrate 10 and the heat generating resistor 20 on the first end 21. .. Further, it is possible to suppress a decrease in the strength of the insulating substrate 10 due to the exposed position of the first end 21 at the one end portion 11 being too biased toward the outer peripheral portion 13.

なお、図心Ｃ２１および図心Ｃ１０は、例えば、ヒータ１を、絶縁基体１０の一端部１１側から、絶縁基体１０の長手方向に撮像して得られる画像データを用いて測定することができる。図心Ｃ２１および図心Ｃ１０を測定するにあたっては、画像解析用のソフトウエアを用いた画像解析を行ってもよい。 The center of gravity C21 and the center of gravity C10 can be measured, for example, by using image data obtained by imaging the heater 1 from one end 11 side of the insulating substrate 10 in the longitudinal direction of the insulating substrate 10. In measuring the centroid C21 and the centroid C10, image analysis using software for image analysis may be performed.

発熱抵抗体２０は、第１リード部２３、第２リード部２４および接続部２５を有している。 The heat generation resistor 20 has a first lead portion 23, a second lead portion 24, and a connection portion 25.

第１リード部２３は、例えば図１に示すように、絶縁基体１０の長手方向に延びる線形状を有している。第１リード部２３は、一方端２３１および他方端２３２を有している。一方端２３１は、発熱抵抗体２０の第１端２１であり、絶縁基体１０の一端部１１に露出している。他方端２３２は、接続部２５に接続されている。なお、図１では、第１リード部２３が直線状に延びる例を示したが、第１リード部２３は屈曲部を含んでいてもよい。また、第１リード部２３は、横断面の面積が一定であってもよいが、横断面の面積が変化していてもよく、例えば、一方端２３１における横断面の面積が、他方端２３２における横断面の面積よりも大きくてもよい。 As shown in FIG. 1, for example, the first lead portion 23 has a linear shape extending in the longitudinal direction of the insulating substrate 10. The first lead portion 23 has one end 231 and the other end 232. On the other hand, the end 231 is the first end 21 of the heat generating resistor 20 and is exposed to one end 11 of the insulating substrate 10. The other end 232 is connected to the connecting portion 25. Although FIG. 1 shows an example in which the first lead portion 23 extends linearly, the first lead portion 23 may include a bent portion. Further, the area of the cross section of the first lead portion 23 may be constant, but the area of the cross section may be changed. For example, the area of the cross section at one end 231 may be the area of the cross section at the other end 232. It may be larger than the cross-sectional area.

第２リード部２４は、例えば図１に示すように、屈曲部を有する曲線形状を有している。第２リード部２４は、一方端２４１および他方端２４２を有している。一方端２４１は、発熱抵抗体２０の第２端２２であり、絶縁基体１０の外周部１３に露出している。他方端２４２は、接続部２５に接続されている。第２リード部２４は、横断面の面積が一定であってもよいが、横断面の面積が変化していてもよく、例えば、一方端２４１における横断面の面積が、他方端２４２における横断面の面積よりも大きくてもよい。 The second lead portion 24 has a curved shape having a bent portion, for example, as shown in FIG. The second lead portion 24 has one end 241 and the other end 242. On the other hand, the end 241 is the second end 22 of the heat generating resistor 20 and is exposed on the outer peripheral portion 13 of the insulating substrate 10. The other end 242 is connected to the connecting portion 25. The cross-sectional area of the second lead portion 24 may be constant, but the cross-sectional area may be changed. For example, the cross-sectional area at one end 241 is the cross-sectional area at the other end 242. It may be larger than the area of.

接続部２５は、例えば図１に示すように、折り返し形状を有し、絶縁基体１０の他端部１２寄りに位置している。接続部２５は、一方端２５１および他方端２５２を有している。接続部２５の一方端２５１には、第１リード部２３の他方端２３２が接続されている。接続部２５の他方端２５２には、第２リード部２４の他方端２４２が接続されている。 As shown in FIG. 1, for example, the connecting portion 25 has a folded shape and is located near the other end portion 12 of the insulating substrate 10. The connecting portion 25 has one end 251 and the other end 252. The other end 232 of the first lead portion 23 is connected to one end 251 of the connecting portion 25. The other end 242 of the second lead portion 24 is connected to the other end 252 of the connecting portion 25.

発熱抵抗体２０は、通電時に特に発熱する領域である発熱領域を有していてもよい。発熱抵抗体２０は、例えば、接続部２５が発熱領域とされていてもよい。発熱抵抗体２０は、接続部２５の横断面の面積が、第１リード部２３の横断面の面積および第２リード部２４の横断面の面積よりも小さくされていてもよい。これにより、接続部２５の単位長さ当たりの電気抵抗値を、第１リード部２３および第２リード部２４の単位長さ当たりの電気抵抗値に比べて大きくすることができる。その結果、接続部２５を発熱領域とすることができる。 The heat generation resistor 20 may have a heat generation region which is a region in which heat is particularly generated when energized. In the heat generation resistor 20, for example, the connection portion 25 may be a heat generation region. In the heat generating resistor 20, the cross-sectional area of the connecting portion 25 may be smaller than the cross-sectional area of the first lead portion 23 and the cross-sectional area of the second lead portion 24. As a result, the electric resistance value per unit length of the connecting portion 25 can be made larger than the electric resistance value per unit length of the first lead portion 23 and the second lead portion 24. As a result, the connection portion 25 can be used as a heat generating region.

発熱抵抗体２０は、接続部２５における絶縁基体１０の形成材料の含有量が、第１リード部２３における絶縁基体１０の形成材料の含有量および第２リード部２４における絶縁基体１０の形成材料の含有量よりも大きくされていてもよい。これによっても、接続部２５の単位長さ当たりの電気抵抗値を、第１リード部２３および第２リード部２４の単位長さ当たりの電気抵抗値に比べて大きくすることができ、その結果、接続部２５を発熱領域とすることができる。 In the heat generation resistor 20, the content of the insulating substrate 10 forming material in the connecting portion 25 is the content of the insulating substrate 10 forming material in the first lead portion 23 and the content of the insulating substrate 10 forming material in the second lead portion 24. It may be larger than the content. Also by this, the electric resistance value per unit length of the connecting portion 25 can be made larger than the electric resistance value per unit length of the first lead portion 23 and the second lead portion 24, and as a result, the electric resistance value per unit length can be increased. The connection portion 25 can be used as a heat generating region.

発熱抵抗体２０の第２端２２は、例えば図２に示すように、絶縁基体１０の長手方向に見たときに、図心Ｃ１０に関して、図心Ｃ２１の反対側に位置していてもよい。これにより、第１端２１と第２端２２との絶縁距離を確保できるため、第１端２１と第２端２２とが短絡することを抑制できる。 As shown in FIG. 2, for example, the second end 22 of the heat generation resistor 20 may be located on the opposite side of the center of gravity C21 with respect to the center of gravity C10 when viewed in the longitudinal direction of the insulating substrate 10. As a result, the insulation distance between the first end 21 and the second end 22 can be secured, so that short-circuiting between the first end 21 and the second end 22 can be suppressed.

ここで、第２端２２が、図心Ｃ１０に関して、図心Ｃ２１の反対側に位置するとは、例えば図２に示すように、絶縁基体１０の長手方向に見たときに、図心Ｃ２１と図心Ｃ１０とを結ぶ仮想線Ｌ１と、第２端２２の絶縁基体１０の外周部１３に沿った長さの中点Ｍ２２と図心Ｃ１０とを結ぶ仮想線Ｌ２との成す角度αが、例えば、０〜３０度であることを指す。仮想線Ｌ１と仮想線Ｌ２との成す角度αは、例えば、０〜２０度であってもよく、０〜１０度であってもよく、実質的に０度であってもよい。角度αが０度より大きい場合には、急速な昇降温または高温での昇降温を繰り返すヒートサイクル下において、絶縁基体１０と発熱抵抗体２０との熱膨張差に起因する応力が同一平面上に集中しにくくなる。このため、絶縁基体１０と発熱抵抗体２０との界面が破壊しにくくなり、その結果、耐久性が向上したヒータを提供することが可能になる。 Here, the fact that the second end 22 is located on the opposite side of the center of gravity C21 with respect to the center of gravity C10 means that, for example, as shown in FIG. 2, when viewed in the longitudinal direction of the insulating substrate 10, the center of gravity C21 and the figure For example, the angle α formed by the virtual line L1 connecting the center C10 and the midpoint M22 having a length along the outer peripheral portion 13 of the insulating substrate 10 at the second end 22 and the virtual line L2 connecting the center of gravity C10 is, for example. It means that it is 0 to 30 degrees. The angle α formed by the virtual line L1 and the virtual line L2 may be, for example, 0 to 20 degrees, 0 to 10 degrees, or substantially 0 degrees. When the angle α is larger than 0 degrees, the stress caused by the difference in thermal expansion between the insulating substrate 10 and the heat generating resistor 20 is on the same plane under a heat cycle in which rapid elevating temperature or elevating temperature at a high temperature is repeated. It becomes difficult to concentrate. Therefore, the interface between the insulating substrate 10 and the heat generating resistor 20 is less likely to be broken, and as a result, it becomes possible to provide a heater with improved durability.

なお、第２端２２の絶縁基体１０の外周部１３に沿った長さの中点Ｍ２２は、例えば、コンピュータ断層撮影（Computed Tomography）を用いて得られる、ヒータ１を絶縁基体１０の長手方向に見たときの断面画像データを用いて測定することができる。中点Ｍ２２を測定するにあたっては、画像解析用のソフトウエアを用いた画像解析を行ってもよい。 The midpoint M22 having a length along the outer peripheral portion 13 of the insulating base 10 at the second end 22 is obtained by using, for example, computed tomography, and the heater 1 is placed in the longitudinal direction of the insulating base 10. It can be measured using the cross-sectional image data when viewed. In measuring the midpoint M22, image analysis using software for image analysis may be performed.

次に、本開示の他の実施形態に係るヒータについて説明する。図３は、本開示の他の実施形態に係るヒータを示す断面図であり、図４は、図３のヒータの平面図である。図３は、本実施形態のヒータを絶縁基体の長手方向に沿って切断した断面を示している。図４は、図３のヒータを、絶縁基体の一端部側から、絶縁基体の長手方向に見た平面図を示している。 Next, the heater according to another embodiment of the present disclosure will be described. FIG. 3 is a cross-sectional view showing a heater according to another embodiment of the present disclosure, and FIG. 4 is a plan view of the heater of FIG. FIG. 3 shows a cross section of the heater of the present embodiment cut along the longitudinal direction of the insulating substrate. FIG. 4 shows a plan view of the heater of FIG. 3 as viewed from one end side of the insulating substrate in the longitudinal direction of the insulating substrate.

本実施形態のヒータ１Ａは、上記実施形態のヒータ１に対して、絶縁基体１０の一端部１１の形状が異なっており、その他については、同様の構成であるので、同様の構成にはヒータ１と同じ参照符号を付して詳細な説明は省略する。 The heater 1A of the present embodiment has a different shape of one end 11 of the insulating substrate 10 from the heater 1 of the above embodiment, and the other parts have the same configuration. Therefore, the heater 1A has the same configuration. The same reference numerals are given and detailed description thereof will be omitted.

ヒータ１Ａは、絶縁基体１０の一端部１１が先細り形状とされている。一端部１１は、例えば図３，４に示すように、絶縁基体１０の長手方向に直交した第１面１１１、および絶縁基体１０の長手方向に対して傾斜した第２面１１２を有している。 The heater 1A has a tapered shape at one end 11 of the insulating substrate 10. As shown in FIGS. 3 and 4, the one end portion 11 has a first surface 111 orthogonal to the longitudinal direction of the insulating substrate 10 and a second surface 112 inclined with respect to the longitudinal direction of the insulating substrate 10. ..

発熱抵抗体２０の第１端２１は、例えば図４に示すように、第１面１１１および第２面１１２に露出していてもよい。これにより、ヒータ１Ａを備えたグロープラグを構成する際に、発熱抵抗体２０に電力を供給するための電極金具を、絶縁基体１０の一端部１１に、第１端２１を覆うように接合することによって、第１端２１が第１面１１１だけに露出している場合と比較して、電極金具と第１端２１との面積を増大させることができる。その結果、電気的接続の長期信頼性が向上したグロープラグを提供することが可能になる。 The first end 21 of the heat generation resistor 20 may be exposed on the first surface 111 and the second surface 112, for example, as shown in FIG. As a result, when forming a glow plug provided with the heater 1A, an electrode fitting for supplying electric power to the heat generating resistor 20 is joined to one end 11 of the insulating substrate 10 so as to cover the first end 21. As a result, the area between the electrode fitting and the first end 21 can be increased as compared with the case where the first end 21 is exposed only on the first surface 111. As a result, it becomes possible to provide glow plugs with improved long-term reliability of electrical connections.

発熱抵抗体２０の第１端２１は、第１面１１１に露出せず、第２面１１２だけに露出していてもよい。この場合、電極金具と第１端２１との接合面の面積をさらに増大させることができるため、電気的接続の長期信頼性が一層向上したグロープラグを提供することが可能になる。 The first end 21 of the heat generation resistor 20 may not be exposed on the first surface 111, but may be exposed only on the second surface 112. In this case, since the area of the joint surface between the electrode fitting and the first end 21 can be further increased, it is possible to provide a glow plug with further improved long-term reliability of electrical connection.

次に、本開示の他の実施形態に係るヒータについて説明する。図５は、本開示の他の実施形態に係るヒータを示す断面図であり、図６は、図５のヒータの平面図である。図５は、本実施形態のヒータを絶縁基体の長手方向に沿って切断した断面を示している。図６は、図５のヒータを、絶縁基体の一端部側から、絶縁基体の長手方向に見た平面図を示している。 Next, the heater according to another embodiment of the present disclosure will be described. FIG. 5 is a cross-sectional view showing a heater according to another embodiment of the present disclosure, and FIG. 6 is a plan view of the heater of FIG. FIG. 5 shows a cross section of the heater of the present embodiment cut along the longitudinal direction of the insulating substrate. FIG. 6 shows a plan view of the heater of FIG. 5 as viewed from one end side of the insulating substrate in the longitudinal direction of the insulating substrate.

本実施形態のヒータ１Ｂは、上記実施形態のヒータ１Ａに対して、発熱抵抗体の形状が異なっており、その他については、同様の構成であるので、同様の構成にはヒータ１Ａと同じ参照符号を付して詳細な説明は省略する。 The heater 1B of the present embodiment has a different shape of the heat generating resistor from the heater 1A of the above embodiment, and has the same configuration except for the heater 1A. A detailed description will be omitted.

ヒータ１Ｂは、絶縁基体１０と発熱抵抗体３０とを備えている。発熱抵抗体３０は、通電によって発熱する部材であり、発熱抵抗体３０は、絶縁基体１０に埋設されている。発熱抵抗体３０は、タングステン、モリブデン、チタン等の炭化物、窒化物または珪化物等を主成分とすることができる。発熱抵抗体３０は、絶縁基体１０の形成材料を含有していてもよい。 The heater 1B includes an insulating substrate 10 and a heat generating resistor 30. The heat generation resistor 30 is a member that generates heat when energized, and the heat generation resistor 30 is embedded in the insulating substrate 10. The heat generation resistor 30 can be mainly composed of a carbide such as tungsten, molybdenum, or titanium, a nitride, or a silicified product. The heat generation resistor 30 may contain a material for forming the insulating substrate 10.

発熱抵抗体３０は、第１導電部３１および第２導電部３２を有している。第１導電部３１は、一端が開放され、他端が閉塞された筒状形状を有しており、第２導電部３２は、線形状を有している。 The heat generation resistor 30 has a first conductive portion 31 and a second conductive portion 32. The first conductive portion 31 has a tubular shape with one end open and the other end closed, and the second conductive portion 32 has a linear shape.

第１導電部３１は、筒状部３３および底部３４を有している。筒状部３３は、筒状の形状を有しており、筒状部３３の軸線は、絶縁基体１０の長手方向に延びている。筒状部３３は、絶縁基体１０の一端部１１側に位置する後端３３１および絶縁基体１０の他端部１２側に位置する先端３３２が開放されている。筒状部３３は、その形状が、円筒状、楕円筒状、多角形筒状等であってもよく、その他の形状であってもよい。本実施形態では、筒状部３３は、円筒状とされている。筒状部３３は、例えば、絶縁基体１０の長手方向に沿った長さが２０〜１２０ｍｍであり、内径が２〜５ｍｍであり、外径が３〜６ｍｍである。 The first conductive portion 31 has a tubular portion 33 and a bottom portion 34. The tubular portion 33 has a tubular shape, and the axis of the tubular portion 33 extends in the longitudinal direction of the insulating substrate 10. In the tubular portion 33, the rear end 331 located on the one end 11 side of the insulating substrate 10 and the tip 332 located on the other end 12 side of the insulating substrate 10 are open. The cylindrical portion 33 may have a cylindrical shape, an elliptical tubular shape, a polygonal tubular shape, or the like, or may have other shapes. In the present embodiment, the tubular portion 33 has a cylindrical shape. The tubular portion 33 has, for example, a length of 20 to 120 mm along the longitudinal direction of the insulating substrate 10, an inner diameter of 2 to 5 mm, and an outer diameter of 3 to 6 mm.

第１導電部３１の底部３４は、筒状部３３の先端３３２に配置され、先端３３２を閉塞している。底部３４は、絶縁基体１０の長手方向に直交する主面および他方主面を有する平板状の形状を有していてもよい。底部３４は、例えば図５に示すように、絶縁基体１０の他端部１２に向かって突出する半球状の形状を有していてもよい。底部３４は、例えば、肉厚が０．５〜１．５ｍｍである。 The bottom portion 34 of the first conductive portion 31 is arranged at the tip end 332 of the tubular portion 33 and closes the tip end 332. The bottom portion 34 may have a flat plate shape having a main surface orthogonal to the longitudinal direction of the insulating substrate 10 and the other main surface. As shown in FIG. 5, for example, the bottom portion 34 may have a hemispherical shape protruding toward the other end portion 12 of the insulating substrate 10. The bottom portion 34 has, for example, a wall thickness of 0.5 to 1.5 mm.

発熱抵抗体３０の第２導電部３２は、第１導電部３１の内周面によって取り囲まれた部位に位置している。第２導電部３２は、一方端３２１および他方端３２２を有している。第２導電部３２の一方端３２１は、絶縁基体１０の一端部１１に露出している。第２導電部３２の他方端３２２は、第１導電部３１の底部３４に接続されている。第２導電部３２は、例えば、全長が２０〜１２０ｍｍであり、自身が延びる方向に直交する断面の面積が０．０００１〜２ｍｍ２である。なお、図５では、第２導電部３２が直線状に延びる例を示したが、第１リード部２３は屈曲部を含んでいてもよい。 The second conductive portion 32 of the heat generation resistor 30 is located at a portion surrounded by the inner peripheral surface of the first conductive portion 31. The second conductive portion 32 has one end 321 and the other end 322. One end 321 of the second conductive portion 32 is exposed to one end 11 of the insulating substrate 10. The other end 322 of the second conductive portion 32 is connected to the bottom portion 34 of the first conductive portion 31. The second conductive portion 32 has, for example, a total length of 20 to 120 mm and an area of a cross section orthogonal to the extending direction of 0.0001 to 2 mm 2. Although FIG. 5 shows an example in which the second conductive portion 32 extends linearly, the first lead portion 23 may include a bent portion.

筒状部３３は、例えば図５に示すように、後端３３１寄りの部分（以下、後端部ともいう）３３３の一部が絶縁基体１０の外周部１３に露出している。これにより、発熱抵抗体３０と発熱抵抗体３０に電力を供給するための部材（例えば、後述する金属製保持部材）とを容易に接続することが可能になる。 As shown in FIG. 5, for example, a part of the tubular portion 33 near the rear end 331 (hereinafter, also referred to as the rear end portion) 333 is exposed on the outer peripheral portion 13 of the insulating substrate 10. This makes it possible to easily connect the heat generating resistor 30 and a member for supplying electric power to the heat generating resistor 30 (for example, a metal holding member described later).

発熱抵抗体３０は、通電時に特に発熱する領域である発熱領域を有していてもよい。発熱抵抗体３０は、例えば、筒状部３３の先端３３２寄りの部分（以下、先端部ともいう）３３４が発熱領域とされていてもよい。 The heat generation resistor 30 may have a heat generation region which is a region in which heat is particularly generated when energized. In the heat generation resistor 30, for example, a portion of the tubular portion 33 near the tip 332 (hereinafter, also referred to as a tip portion) 334 may be a heat generation region.

発熱抵抗体３０は、先端部３３４の横断面の面積が、後端部３３３の横断面の面積および第２導電部３２の横断面の面積よりも小さくされていてもよい。これにより、先端部３３４の単位長さ当たりの電気抵抗値を、後端部３３３および第２導電部３２の単位長さ当たりの電気抵抗値に比べて大きくすることができるため、先端部３３４を発熱領域とすることができる。なお、本実施形態において、「横断面」は、絶縁基体１０の長手方向に直交する断面を指し、「単位長さ」は、絶縁基体１０の長手方向に沿った単位長さを指す。 In the heat generation resistor 30, the cross-sectional area of the front end portion 334 may be smaller than the cross-sectional area of the rear end portion 333 and the cross-sectional area of the second conductive portion 32. As a result, the electric resistance value per unit length of the tip portion 334 can be made larger than the electric resistance value per unit length of the rear end portion 333 and the second conductive portion 32, so that the tip portion 334 can be increased. It can be a heat generating region. In the present embodiment, the "cross section" refers to a cross section orthogonal to the longitudinal direction of the insulating substrate 10, and the "unit length" refers to the unit length along the longitudinal direction of the insulating substrate 10.

発熱抵抗体３０は、底部３４の肉厚が先端部３３４の肉厚に略等しくされていてもよい。これにより、先端部３３４に加えて、先端部３３４に繋がる底部３４を発熱領域とすることができるため、ヒータ１Ｂの加熱効率を向上させることができる。 The wall thickness of the bottom portion 34 of the heat generation resistor 30 may be substantially equal to the wall thickness of the tip portion 334. As a result, in addition to the tip portion 334, the bottom portion 34 connected to the tip portion 334 can be used as a heat generating region, so that the heating efficiency of the heater 1B can be improved.

発熱抵抗体３０は、先端部３３４における絶縁基体１０の形成材料の含有量が、後端部３３３における絶縁基体１０の形成材料の含有量および第２導電部３２における絶縁基体１０の形成材料の含有量よりも大きくされていてもよい。これによっても、先端部３３４の単位長さ当たりの電気抵抗値を、後端部３３３および第２導電部３２の単位長さ当たりの電気抵抗値に比べて大きくすることができるため、先端部３３４を発熱領域とすることができる。 In the heat generation resistor 30, the content of the insulating substrate 10 forming material in the front end portion 334 is the content of the insulating substrate 10 forming material in the rear end portion 333 and the content of the insulating substrate 10 forming material in the second conductive portion 32. It may be larger than the amount. Also by this, the electric resistance value per unit length of the tip portion 334 can be made larger than the electric resistance value per unit length of the rear end portion 333 and the second conductive portion 32, so that the tip portion 334 can be increased. Can be a heat generating region.

発熱抵抗体３０は、底部３４における絶縁基体１０の形成材料の含有量が、先端部３３４における絶縁基体１０の形成材料の含有量に略等しくされていてもよい。これにより、先端部３３４に加えて、先端部３３４に繋がる底部３４を発熱領域とすることができるため、ヒータ１Ｂの加熱効率を向上させることができる。 In the heat generation resistor 30, the content of the material for forming the insulating base 10 at the bottom 34 may be substantially equal to the content of the material for forming the insulating base 10 at the tip 334. As a result, in addition to the tip portion 334, the bottom portion 34 connected to the tip portion 334 can be used as a heat generating region, so that the heating efficiency of the heater 1B can be improved.

ヒータ１Ｂは、例えば図６に示すように、絶縁基体１０の長手方向に見たときに、第２導電部３２の一方端３２１の図心Ｃ３２１と絶縁基体１０の図心Ｃ１０とがずれている。これにより、急速な昇降温または高温での昇降温を繰り返すヒートサイクル下において、絶縁基体１０と発熱抵抗体３０との熱膨張差に起因する応力が、発熱抵抗体３０の一方端３２１に集中することを抑制できる。その結果、絶縁基体１０と発熱抵抗体３０との熱膨張差に起因する応力が第２導電部３２の一方端３２１に集中することを抑制でき、一方端３２１にクラックが生じる虞を低減できる。ひいては、外部電源等の外部装置との電気的接続の長期信頼性が向上したヒータを提供することができる。 In the heater 1B, for example, as shown in FIG. 6, when viewed in the longitudinal direction of the insulating base 10, the center of gravity C321 of one end 321 of the second conductive portion 32 and the center of gravity C10 of the insulating base 10 are deviated from each other. .. As a result, stress due to the difference in thermal expansion between the insulating substrate 10 and the heat generation resistor 30 is concentrated on one end 321 of the heat generation resistor 30 under a heat cycle in which rapid temperature rise and fall or temperature rise and fall at a high temperature are repeated. Can be suppressed. As a result, it is possible to suppress the stress caused by the difference in thermal expansion between the insulating substrate 10 and the heat generating resistor 30 from concentrating on one end 321 of the second conductive portion 32, and it is possible to reduce the possibility of cracks occurring in one end 321. As a result, it is possible to provide a heater having improved long-term reliability of electrical connection with an external device such as an external power supply.

図心Ｃ３２１と図心Ｃ１０との距離は、絶縁基体１０の長手方向に見たときに、例えば、絶縁基体１０の直径の０％より大きく２０％より小さくてもよく、絶縁基体１０の直径の５％より大きく１５％より小さくてもよく、絶縁基体１０の直径の１０％程度であってもよい。図心Ｃ３２１と図心Ｃ１０との距離がこれらの範囲にある場合、絶縁基体１０と発熱抵抗体３０との熱膨張差に起因する応力が一方端３２１に集中することを効果的に抑制することができる。 The distance between the center C321 and the center C10 may be larger than 0% and smaller than 20% of the diameter of the insulating base 10 when viewed in the longitudinal direction of the insulating base 10, for example, the diameter of the insulating base 10. It may be larger than 5% and smaller than 15%, and may be about 10% of the diameter of the insulating substrate 10. When the distance between the center of gravity C321 and the center of gravity C10 is within these ranges, it is possible to effectively suppress the concentration of stress due to the difference in thermal expansion between the insulating substrate 10 and the heat generating resistor 30 on one end 321. Can be done.

ヒータ１Ｂは、絶縁基体１０の一端部１１が先細り形状とされている。一端部１１は、例えば図５，６に示すように、絶縁基体１０の長手方向に直交した第１面１１１と、長手方向に対して傾斜した第２面１１２とを有している。 The heater 1B has a tapered shape at one end 11 of the insulating substrate 10. As shown in FIGS. 5 and 6, the one end portion 11 has a first surface 111 orthogonal to the longitudinal direction of the insulating substrate 10 and a second surface 112 inclined with respect to the longitudinal direction.

第２導電部３２の一方端３２１は、例えば図５，６に示すように、第１面１１１および第２面１１２に露出している。これにより、これにより、ヒータ１Ｂを備えたグロープラグを構成する際に、発熱抵抗体３０に電力を供給するための電極金具を、絶縁基体１０の一端部１１に、一方端３２１を覆うように接合することによって、第１端２１が第１面１１１だけに露出している場合と比較して、電極金具と一方端３２１との面積を増大させることができる。その結果、電気的接続の長期信頼性が向上したグロープラグを提供することが可能になる。 One end 321 of the second conductive portion 32 is exposed on the first surface 111 and the second surface 112, for example, as shown in FIGS. 5 and 6. As a result, when the glow plug provided with the heater 1B is configured, the electrode metal fittings for supplying electric power to the heat generating resistor 30 are covered with one end 11 of the insulating substrate 10 and one end 321. By joining, the area between the electrode fitting and one end 321 can be increased as compared with the case where the first end 21 is exposed only on the first surface 111. As a result, it becomes possible to provide glow plugs with improved long-term reliability of electrical connections.

第２導電部３２の一方端３２１は、第１面１１１に露出せず、第２面１１２だけに露出していてもよい。これにより、電極金具と一方端３２１との接合面の面積をさらに増大させることができるため、電気的接続の長期信頼性が一層向上したグロープラグを提供することが可能になる。 One end 321 of the second conductive portion 32 may not be exposed on the first surface 111, but may be exposed only on the second surface 112. As a result, the area of the joint surface between the electrode fitting and the one end 321 can be further increased, so that it is possible to provide a glow plug with further improved long-term reliability of electrical connection.

次に、本開示の一実施形態に係るグロープラグについて説明する。図７は、本開示の一実施形態に係るグロープラグを示す断面図である。図７は、本実施形態のグロープラグを絶縁基体の長手方向に沿って切断した断面を示している。 Next, a glow plug according to an embodiment of the present disclosure will be described. FIG. 7 is a cross-sectional view showing a glow plug according to an embodiment of the present disclosure. FIG. 7 shows a cross section of the glow plug of the present embodiment cut along the longitudinal direction of the insulating substrate.

グロープラグ２は、ヒータ１，１Ａ，１Ｂと金属製保持部材４０とを備えている。なお、以下では、グロープラグ２がヒータ１Ａを備える例について説明するが、グロープラグ２はヒータ１またはヒータ１Ｂを備えていてもよい。 The glow plug 2 includes heaters 1, 1A and 1B and a metal holding member 40. In the following, an example in which the glow plug 2 includes the heater 1A will be described, but the glow plug 2 may include the heater 1 or the heater 1B.

金属製保持部材４０は、ヒータ１Ａを保持するとともに、発熱抵抗体２０に電力を供給するための部材である。金属製保持部材４０は、金属材料から成る。金属製保持部材４０に用いられる金属材料としては、例えば、ステンレス、鉄ニッケルコバルト合金等が挙げられる。 The metal holding member 40 is a member for holding the heater 1A and supplying electric power to the heat generating resistor 20. The metal holding member 40 is made of a metal material. Examples of the metal material used for the metal holding member 40 include stainless steel, iron-nickel-cobalt alloy, and the like.

金属製保持部材４０は、筒状の形状を有している。金属製保持部材４０は、ヒータ１Ａに、絶縁基体１０の一端部１１寄りの部位を取り囲むように取り付けられている。金属製保持部材４０とヒータ１Ａとは、導電性接合材５０によって互いに接合されている。導電性接合材５０は、金属製保持部材４０と発熱抵抗体２０の第２端２２との間に、絶縁基体１０を周方向に囲むように配置されている。これにより、金属製保持部材４０と発熱抵抗体２０の第２端２２とが電気的に接続されている。 The metal holding member 40 has a tubular shape. The metal holding member 40 is attached to the heater 1A so as to surround a portion of the insulating substrate 10 near one end 11. The metal holding member 40 and the heater 1A are joined to each other by a conductive joining material 50. The conductive bonding material 50 is arranged between the metal holding member 40 and the second end 22 of the heat generating resistor 20 so as to surround the insulating substrate 10 in the circumferential direction. As a result, the metal holding member 40 and the second end 22 of the heat generating resistor 20 are electrically connected.

導電性接合材５０としては、ガラス成分を５〜２０質量％含んだ銀銅ろう、銀ろうまたは銅ろう等を用いることができる。ガラス成分は絶縁基体１０のセラミックスとの濡れ性が良く、摩擦係数が大きいため、導電性接合材５０と絶縁基体１０との接合強度および導電性接合材５０と金属製保持部材４０との接合強度を向上させることができる。 As the conductive bonding material 50, silver-copper brazing, silver brazing, copper 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 ceramics of the insulating substrate 10 and has a large coefficient of friction, the bonding strength between the conductive bonding material 50 and the insulating substrate 10 and the bonding strength between the conductive bonding material 50 and the metal holding member 40 Can be improved.

グロープラグ２は、電極金具６０をさらに備えている。電極金具６０は、発熱抵抗体２０に電力を供給するための部材である。電極金具６０は、金属材料から成る。電極金具６０に用いられる金属材料としては、例えば、ニッケル、ステンレス等が挙げられる。電極金具６０は、金属製保持部材４０の内側に位置し、発熱抵抗体２０の第１端２１に電気的に接続されている。電極金具６０は、第１端２１の、一端部１１に露出した面の全面を覆うように取り付けられている。電極金具６０は、金属製保持部材４０との間で短絡が生じないように、金属製保持部材４０の内周面から離隔している。 The glow plug 2 further includes an electrode metal fitting 60. The electrode metal fitting 60 is a member for supplying electric power to the heat generating resistor 20. The electrode fitting 60 is made of a metal material. Examples of the metal material used for the electrode fitting 60 include nickel, stainless steel, and the like. The electrode fitting 60 is located inside the metal holding member 40 and is electrically connected to the first end 21 of the heat generating resistor 20. The electrode metal fitting 60 is attached so as to cover the entire surface of the first end 21 exposed to the one end portion 11. The electrode fitting 60 is separated from the inner peripheral surface of the metal holding member 40 so as not to cause a short circuit with the metal holding member 40.

電極金具６０は、種々の形態のものを用いることができる。電極金具６０は、例えば図７に示すように、絶縁基体１０の一端部１１に被さるように取り付けられるキャップ部６１と、外部電源等の外部装置の接続電極に電気的に接続される線状部６２とを有していてもよい。線状部６２は、外部装置との接続における応力緩和のためのコイル状部６２１を有していてもよい。電極金具６０は、発熱抵抗体２０に電気的に接続されるとともに、外部装置と電気的に接続される。 As the electrode metal fitting 60, various forms can be used. As shown in FIG. 7, for example, the electrode fitting 60 has a cap portion 61 attached so as to cover one end portion 11 of the insulating substrate 10 and a linear portion electrically connected to a connection electrode of an external device such as an external power supply. 62 and may have. The linear portion 62 may have a coiled portion 621 for stress relaxation in connection with an external device. The electrode fitting 60 is electrically connected to the heat generating resistor 20 and is also electrically connected to an external device.

グロープラグ２は、金属製保持部材４０と電極金具６０との間に電圧を印加することによって、金属製保持部材４０および電極金具６０を介して発熱抵抗体２０に電流を流し、発熱抵抗体２０を発熱させることができる。 By applying a voltage between the metal holding member 40 and the electrode fitting 60, the glow plug 2 causes a current to flow through the metal holding member 40 and the electrode fitting 60 to the heat generating resistor 20, and the heat generating resistor 20 Can be heated.

本実施形態のグロープラグ２によれば、ヒータ１，１Ａ，１Ｂを備えることにより、外部電源等の外部装置との電気的接続の長期信頼性が向上した、小型かつ小径のグロープラグ２を提供することが可能になる。 According to the glow plug 2 of the present embodiment, by providing the heaters 1, 1A and 1B, a small and small diameter glow plug 2 having improved long-term reliability of electrical connection with an external device such as an external power supply is provided. Will be possible.

以上、本開示の実施形態について詳細に説明したが、また、本開示は上述の実施の形態に限定されるものではなく、本開示の要旨を逸脱しない範囲内において、種々の変更、改良等が可能である。上記各実施形態をそれぞれ構成する全部または一部を、適宜、矛盾しない範囲で組み合わせ可能であることは、言うまでもない。 Although the embodiments of the present disclosure have been described in detail above, the present disclosure is not limited to the above-described embodiments, and various changes, improvements, etc. may be made without departing from the gist of the present disclosure. It is possible. Needless to say, all or a part of each of the above embodiments can be combined as appropriate and within a consistent range.

１，１Ａ，１Ｂ ヒータ
２ グロープラグ
１０ 絶縁基体
１１ 一端部
１１１ 第１面
１１２ 第２面
１２ 他端部
１３ 外周部
２０ 発熱抵抗体
２１ 第１端
２２ 第２端
２３ 第１リード部
２３１ 一方端
２３２ 他方端
２４ 第２リード部
２４１ 一方端
２４２ 他方端
２５ 接続部
２５１ 一方端
２５２ 他方端
３０ 発熱抵抗体
３１ 第１導電部
３２ 第２導電部
３２１ 一方端
３２２ 他方端
３３ 筒状部
３３１ 後端
３３２ 先端
３３３ 後端部
３３４ 先端部
３４ 底部
４０ 金属製保持部材
５０ 導電性接合材
６０ 電極金具
６１ キャップ部
６２ 線状部
６２１ コイル状部 1,1A, 1B Heater 2 Glow plug 10 Insulation base 11 One end 111 First surface 112 Second surface 12 Other end 13 Outer circumference 20 Heat-generating resistor 21 First end 22 Second end 23 First lead part 231 One end 232 Other end 24 Second lead part 241 One end 242 Other end 25 Connection part 251 One end 252 The other end 30 Heat-generating resistor 31 First conductive part 32 Second conductive part 321 One end 322 Other end 33 Cylindrical part 331 Rear end 332 Front end 333 Rear end part 334 Tip part 34 Bottom part 40 Metal holding member 50 Conductive bonding material 60 Electrode metal fittings 61 Cap part 62 Linear part 621 Coil-shaped part

Claims (4)

棒状の絶縁基体と、
前記絶縁基体に埋設され、第１端が前記絶縁基体の一端部に露出しているとともに、前記絶縁基体の長手方向に見たときに、前記第１端の図心と前記絶縁基体の図心とがずれている発熱抵抗体と、を備えるヒータ。 With a rod-shaped insulating substrate,
It is embedded in the insulating substrate, the first end is exposed at one end of the insulating substrate, and the center of gravity of the first end and the center of gravity of the insulating substrate when viewed in the longitudinal direction of the insulating substrate. A heater with a heat-generating resistor that is out of alignment. 前記発熱抵抗体は、第２端が前記絶縁基体の外周部に露出しており、
前記長手方向に見たときに、前記第２端は、前記絶縁基体の図心に関して、前記第１端の図心の反対側に位置している、請求項１に記載のヒータ。 The second end of the heat generating resistor is exposed on the outer peripheral portion of the insulating substrate.
The heater according to claim 1, wherein the second end is located on the opposite side of the center of gravity of the first end with respect to the center of gravity of the insulating substrate when viewed in the longitudinal direction. 前記絶縁基体の前記一端部は、前記長手方向に垂直な第１面と、前記長手方向に対して傾斜した第２面とを有する先細り形状であり、
前記発熱抵抗体の前記第１端は、前記第１面および前記第２面に露出している、請求項１または２に記載のヒータ。 The one end portion of the insulating substrate has a tapered shape having a first surface perpendicular to the longitudinal direction and a second surface inclined with respect to the longitudinal direction.
The heater according to claim 1 or 2, wherein the first end of the heat generation resistor is exposed on the first surface and the second surface. 請求項１〜３のいずれかに記載のヒータと、
前記発熱抵抗体の前記第２端に電気的に接続されるとともに前記ヒータを保持する金属製保持部材と、を備えるグロープラグ。 The heater according to any one of claims 1 to 3 and
A glow plug comprising a metal holding member that is electrically connected to the second end of the heat generating resistor and holds the heater.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009096477A1 (en) * 2008-01-29 2009-08-06 Kyocera Corporation Ceramic heater and glow plug
US20100078421A1 (en) * 2008-10-01 2010-04-01 Federal-Mogul Italy Sr1 Glow plug adn heater assembly therefor with an improved connection between a central electrode and a heater probe of the heater assembly
JP2014099320A (en) * 2012-11-14 2014-05-29 Kyocera Corp Heater and glow plug having the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009096477A1 (en) * 2008-01-29 2009-08-06 Kyocera Corporation Ceramic heater and glow plug
US20100078421A1 (en) * 2008-10-01 2010-04-01 Federal-Mogul Italy Sr1 Glow plug adn heater assembly therefor with an improved connection between a central electrode and a heater probe of the heater assembly
JP2014099320A (en) * 2012-11-14 2014-05-29 Kyocera Corp Heater and glow plug having the same

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