WO2019004286A1 - Heater - Google Patents
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- Publication number
- WO2019004286A1 WO2019004286A1 PCT/JP2018/024376 JP2018024376W WO2019004286A1 WO 2019004286 A1 WO2019004286 A1 WO 2019004286A1 JP 2018024376 W JP2018024376 W JP 2018024376W WO 2019004286 A1 WO2019004286 A1 WO 2019004286A1
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- WIPO (PCT)
- Prior art keywords
- ceramic body
- rear end
- lead terminal
- heater
- ceramic
- Prior art date
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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
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- 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
Definitions
- the present disclosure relates to, for example, a heater for ignition or flame detection in a combustion type vehicle heating system, a heater for ignition of various combustion devices such as a petroleum fan heater, a heater for glow plugs of a diesel engine, and various sensors such as an oxygen sensor.
- the present invention relates to a heater used for the heater of the above or a heater for heating a measuring instrument.
- Patent Document 1 a ceramic heater described in JP-A-2006-258417 (hereinafter, referred to as Patent Document 1) is known.
- the ceramic heater disclosed in Patent Document 1 includes a rod-shaped ceramic heater main body, a resistance heating element embedded at the front end side in the ceramic heater main body, an electrode lead-out lead connected to the resistance heating element, and a ceramic heater main body And a lead terminal connected to the lead for electrode extraction at the rear end of the The lead terminal is provided in close contact with the rear end surface of the ceramic heater main body.
- the heater according to an example of the present disclosure is electrically connected to a rod-like or cylindrical ceramic body, a heating resistor embedded at the tip end of the ceramic body, and the heating resistor, and is embedded in the ceramic body.
- a feed portion drawn to the side surface on the rear end side of the ceramic body, and a lead terminal electrically connected to the feed portion and fixed to the side surface on the rear end side of the ceramic body.
- the lead terminal is continuous with the first portion extending from the portion fixed to the side surface on the rear end side of the ceramic body to the rear from the rear end surface of the ceramic body, and the first portion; And a second portion overlapping the ceramic body when viewed in a direction perpendicular to the rear end surface, and a gap is provided between the ceramic body and the second portion.
- FIG. 1 is a longitudinal sectional view showing a heater 10 which is an example of the present disclosure.
- the heater 10 includes a rod-like or cylindrical ceramic body 1, a heating resistor 2 embedded at the tip end of the ceramic body 1, and a rear end of the ceramic body 1 embedded in the ceramic body 1.
- the power supply unit 3 is drawn out to the side surface of the side, and the lead terminal 4 fixed to the side surface on the rear end side of the ceramic body 1.
- the front end side of the ceramic body 1 here means one when the ceramic body 1 is divided in half in the longitudinal direction.
- the rear end side of the ceramic body 1 mentioned here means the other when the ceramic body 1 is divided in half in the longitudinal direction.
- the heating resistor 2 is a resistor that generates heat when current flows.
- the heating resistor 2 is embedded in the front end side of the ceramic body 1.
- the heating resistor 2 has, for example, a folded shape.
- the heating resistor 2 has a metal material such as tungsten or tungsten carbide, for example.
- the dimensions of the heat generating resistor 2 can be, for example, 0.1 to 5 mm in width, 0.05 to 0.3 mm in thickness, and 1 to 500 mm in total length.
- the power feeding portion 3 is formed to extend from the portion joined to the heating resistor 2 to the rear end side of the ceramic body 1 and the back of the ceramic body 1. At the end side, there is a portion formed to extend from the inside of the ceramic body 1 to the side surface of the ceramic body 1. Further, in the case where the heat generating resistor 2 has a folded shape, the feed portions 3 may be provided at both ends of the heat generating resistor 2 respectively. In this case, one of the feeding parts 3 may be drawn out to the side surface on the rear end side of the ceramic body 1.
- the feeding portion 3 has a metal material containing, for example, tungsten or tungsten carbide, tungsten nitride, molybdenum, or ceramic powder such as silicon nitride. For example, by making the cross-sectional area larger than the heating resistor 2, the resistance value per unit length may be low. Thereby, the calorific value in the feed section 3 can be reduced.
- the dimensions of the feeding portion 3 can be, for example, 0.1 to 5 mm in width, 0.005 to 0.3 mm in thickness, and 1 to 100 mm in total length.
- the entire device does not spread in the radial direction of the ceramic body 1 and can be miniaturized. As a result, the mountability of the heater 10 can be enhanced.
- a gap is provided between the ceramic body 1 and the second portion 42.
- the second portion 42 can be deformed.
- the second portion 42 can absorb an external force by deformation of the second portion 42. Therefore, it is possible to reduce the possibility that stress is concentrated on the bonding portion between the ceramic body 1 and the lead terminal 4.
- the possibility of breakage of the joint between the ceramic body 1 and the lead terminal 4 can be reduced.
- the durability of the heater 10 can be improved.
- the other end of the second portion 42 is, for example, 0.01 to 1 mm away from the end face of the ceramic body 1.
- the first portion 41 and the second portion 42 may be smoothly continuous.
- “smoothly continuous” means that the side surface of the first portion 41 and the side surface of the second portion 42 are continuous so as to form a curved surface.
- the second portion 42 may be curved. Thereby, when an external force is applied to the second portion 42, the stress generated in the second portion 42 can be dispersed. Therefore, stress is concentrated on a part of the lead terminal 4 and the possibility of breakage of the lead terminal 4 can be reduced. As a result, the durability of the heater 10 can be improved.
- the second portion 42 may have an arc shape which is convex in a direction away from the rear end surface 11 of the ceramic body 1. In this case, when vibration in the axial direction of the ceramic body 1 is applied to the second portion 42, the vibration can be absorbed by deformation of the second portion 42. As a result, the possibility of stress concentration on the joint between the ceramic body 1 and the lead terminal 4 can be reduced. Therefore, the risk of damage to the lead terminal 4 can be reduced. As a result, the durability of the heater 10 can be improved.
- the lead terminal 4 may further include a third portion 43 which is continuous with the second portion 42 and extends in a direction away from the rear end surface 11.
- a third portion 43 which is continuous with the second portion 42 and extends in a direction away from the rear end surface 11.
- the third portion 43 may have a portion extending in a direction perpendicular to the rear end surface 11 of the ceramic body 1.
- the second portion 42 and the third portion 43 may be smoothly continuous.
- the third portion 43 of the lead terminal 4 it is possible to disperse the stress applied to the portion where the second portion 42 and the third portion 43 are continuous. Therefore, the possibility that the part which the 2nd part 42 and the 3rd part 43 continue may be damaged can be reduced. As a result, the durability of the lead terminal 4 can be improved.
- “smoothly continuous” means that the side surface of the second portion 42 and the side surface of the third portion 43 are continuous so as to form a curved surface.
- the second portion 42 may extend in the direction away from the rear end surface 11 and may be bonded to the outer edge portion of the rear end surface 11 by the bonding material 5.
- the bonding strength between the ceramic body 1 and the lead terminal 4 is increased by the bonding material 5, it is possible to provide a gap in which the second portion 42 is deformed when an external force is applied to the second portion 42.
- the durability of the heater 10 can be improved.
- the outer edge portion is an outer side of an imaginary circle having a half diameter and the same center as the rear end surface 11 of the rear end surface 11. It is an area.
- the shape of rear end face 11 of ceramic body 1 is a quadrilateral, it is a similar shape to rear end face 11 of rear end face 11 in a region outside a virtual quadrilateral whose half length is half and whose center is the same. is there.
- the first portion 41 may extend so as to surround the outer peripheral surface of the ceramic body 1 in the circumferential direction of the ceramic body 1.
- the first portion 41 may spirally surround the outer peripheral surface of the ceramic body 1. Therefore, the first portion 41 can be hardly peeled off from the ceramic body 1 against external force from various directions in the circumferential direction.
- the durability of the heater 10 can be improved.
- the first portion 41 may be wound 2 to 6 times on the side surface on the rear end side of the ceramic body 1.
- the bonding material 5 may be provided on the whole of the ceramic body 1 in the circumferential direction, and the ceramic body 1 and the lead terminal 4 may be bonded on the whole of the ceramic body 1 in the circumferential direction.
- the inner curve of the lead terminal 4 when viewed in cross section or side A line connecting the start point of the first portion and the start point of the outer curve can be used as the boundary between the first portion 41 and the second portion 42.
- a line connecting the second portion 42 and the vertex of the outer broken line can be used as the boundary between the second portion 42 and the third portion 43.
- Ceramic body 11 Rear end face 2: Heating resistor 3: Feeding part 4: Lead terminal 41: First part 42: Second part 43: Third part 5: Bonding material 10: Heater
Abstract
This heater 10 has: a ceramic body 1; a heat dissipation resistive body 2 embedded in the tip side of the ceramic body 1; a power supply part 3 embedded in the ceramic body 1 and drawn out from a side surface on the rear end side of the ceramic body 1; and a lead terminal 4 electrically connected to the power supply part 3 and fixed to the side surface of the rear end side of the ceramic body 1. The lead terminal 4 has: a first portion 41 extending from a portion fixed to the side surface on the rear end side of the ceramic body 1 to the rear side of the rear end surface 11 of the ceramic body 1; and a second portion 41 continuous with the first portion 41, and overlapped with the ceramic body 1 when viewed in a direction perpendicular to the rear end surface 11, wherein a gap is provided between the ceramic body 1 and the second portion 42.
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の点火用のヒータ、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の加熱用のヒータ等に利用されるヒータに関するものである。
The present disclosure relates to, for example, a heater for ignition or flame detection in a combustion type vehicle heating system, a heater for ignition of various combustion devices such as a petroleum fan heater, a heater for glow plugs of a diesel engine, and various sensors such as an oxygen sensor. The present invention relates to a heater used for the heater of the above or a heater for heating a measuring instrument.
ヒータとして、例えば、特開２００６－２５８４１７号公報（以下、特許文献１という）に記載のセラミックヒータが知られている。特許文献１に開示されたセラミックヒータは、棒状のセラミックヒータ本体と、セラミックヒータ本体中の先端側に埋設された抵抗発熱体と、抵抗発熱体に接続された電極取り出し用リードと、セラミックヒータ本体の後端において電極取り出し用リードに接続されたリード端子とを備えている。リード端子は、セラミックヒータ本体の後端面に密着して設けられている。
As a heater, for example, a ceramic heater described in JP-A-2006-258417 (hereinafter, referred to as Patent Document 1) is known. The ceramic heater disclosed in Patent Document 1 includes a rod-shaped ceramic heater main body, a resistance heating element embedded at the front end side in the ceramic heater main body, an electrode lead-out lead connected to the resistance heating element, and a ceramic heater main body And a lead terminal connected to the lead for electrode extraction at the rear end of the The lead terminal is provided in close contact with the rear end surface of the ceramic heater main body.
本開示の一例のヒータは、棒状または筒状のセラミック体と、該セラミック体の先端側に埋設された発熱抵抗体と、該発熱抵抗体に電気的に接続されており、前記セラミック体に埋設されて前記セラミック体の後端側の側面に引き出された給電部と、該給電部に電気的に接続されており、前記セラミック体の後端側の側面に固定されているリード端子とを有しており、該リード端子は、前記セラミック体の後端側の側面に固定されている部分から前記セラミック体の後端面より後方まで伸びる第１部分と、該第１部分に連続しており、前記後端面に対して垂直な方向から見たときに前記セラミック体に重なる第２部分とを有しており、前記セラミック体と前記第２部分との間に、隙間を有している。
The heater according to an example of the present disclosure is electrically connected to a rod-like or cylindrical ceramic body, a heating resistor embedded at the tip end of the ceramic body, and the heating resistor, and is embedded in the ceramic body. A feed portion drawn to the side surface on the rear end side of the ceramic body, and a lead terminal electrically connected to the feed portion and fixed to the side surface on the rear end side of the ceramic body. The lead terminal is continuous with the first portion extending from the portion fixed to the side surface on the rear end side of the ceramic body to the rear from the rear end surface of the ceramic body, and the first portion; And a second portion overlapping the ceramic body when viewed in a direction perpendicular to the rear end surface, and a gap is provided between the ceramic body and the second portion.
本開示のヒータ１０の一例について、図面を用いて詳細に説明する。
An example of the heater 10 of the present disclosure will be described in detail using the drawings.
図１は、本開示の一例であるヒータ１０を示す縦断面図である。図１に示すように、ヒータ１０は、棒状または筒状のセラミック体１と、セラミック体１の先端側に埋設された発熱抵抗体２と、セラミック体１に埋設されてセラミック体１の後端側の側面に引き出された給電部３と、セラミック体１の後端側の側面に固定されているリード端子４とを備えている。なお、ここでいうセラミック体１の先端側とは、セラミック体１を長手方向で半分に分けたときの一方を意味している。また、ここでいうセラミック体１の後端側とは、セラミック体１を長手方向で半分に分けたときの他方を意味している。
FIG. 1 is a longitudinal sectional view showing a heater 10 which is an example of the present disclosure. As shown in FIG. 1, the heater 10 includes a rod-like or cylindrical ceramic body 1, a heating resistor 2 embedded at the tip end of the ceramic body 1, and a rear end of the ceramic body 1 embedded in the ceramic body 1. The power supply unit 3 is drawn out to the side surface of the side, and the lead terminal 4 fixed to the side surface on the rear end side of the ceramic body 1. In addition, the front end side of the ceramic body 1 here means one when the ceramic body 1 is divided in half in the longitudinal direction. Further, the rear end side of the ceramic body 1 mentioned here means the other when the ceramic body 1 is divided in half in the longitudinal direction.
セラミック体１は、発熱抵抗体２を保護するために設けられる部材である。セラミック体１の形状は、棒状または筒状の部材である。棒状としては、例えば、円柱状または角柱状等の柱状が挙げられる。筒状としては、例えば、円筒状または角筒状等が挙げられる。セラミック体１は、絶縁性のセラミック材料を有する。絶縁性の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または炭化物セラミックス等を用いることができる。セラミック体１の寸法は、例えばセラミック体１の形状が円柱状のときは、直径を０．５～１００ｍｍに、長さを１～２００ｍｍにすることができる。
The ceramic body 1 is a member provided to protect the heating resistor 2. The shape of the ceramic body 1 is a rod-like or cylindrical member. As rod shape, columnar shape, such as cylindrical shape or prismatic shape, is mentioned, for example. As a cylindrical shape, cylindrical shape or square cylinder shape etc. are mentioned, for example. The ceramic body 1 has an insulating ceramic material. As an insulating ceramic material, oxide ceramics, nitride ceramics, carbide ceramics, etc. can be used, for example. The dimensions of the ceramic body 1 can be, for example, 0.5 to 100 mm in diameter and 1 to 200 mm in length when the shape of the ceramic body 1 is cylindrical.
なお、セラミック体１には、発熱抵抗体２に含まれる金属元素の化合物が含まれていてもよく、例えば発熱抵抗体２にタングステンまたはモリブデンが含まれている場合は、ＷＳｉ２またはＭｏＳｉ２が含まれていてもよい。このようにすることで、母材であるセラミックスの熱膨張率を発熱抵抗体２の熱膨張率に近づけることができ、ヒータ１０の耐久性を向上させることができる。
The ceramic body 1 may contain a compound of a metal element contained in the heating resistor 2. For example, when the heating resistor 2 contains tungsten or molybdenum, WSi 2 or MoSi 2 is contained. It may be included. By doing this, the coefficient of thermal expansion of the ceramic which is the base material can be made close to the coefficient of thermal expansion of the heating resistor 2, and the durability of the heater 10 can be improved.
発熱抵抗体２は、電流が流れることによって発熱する抵抗体である。発熱抵抗体２は、セラミック体１の先端側に埋設されて設けられている。発熱抵抗体２は、例えば、折り返し形状を有している。発熱抵抗体２は、例えばタングステンまたは炭化タングステン等の金属材料を有する。発熱抵抗体２の寸法は、例えば幅を０．１～５ｍｍに、厚みを０．０５～０．３ｍｍに、全長を１～５００ｍｍにすることができる。
The heating resistor 2 is a resistor that generates heat when current flows. The heating resistor 2 is embedded in the front end side of the ceramic body 1. The heating resistor 2 has, for example, a folded shape. The heating resistor 2 has a metal material such as tungsten or tungsten carbide, for example. The dimensions of the heat generating resistor 2 can be, for example, 0.1 to 5 mm in width, 0.05 to 0.3 mm in thickness, and 1 to 500 mm in total length.
給電部３は、発熱抵抗体２に電気を供給するための部材である。給電部３は、セラミック体１に埋設されて設けられている。また、給電部３は、セラミック体１の内部からセラミック体１の後端側の側面に引き出されている。給電部３は、セラミック体１の内部において発熱抵抗体２に電気的に接続されている。本開示のヒータ１０の一例においては、給電部３の一端が発熱抵抗体２に接続されており、給電部３の他端が後端側の側面においてリード端子４に接合されている。
The power supply unit 3 is a member for supplying electricity to the heating resistor 2. The power supply unit 3 is embedded in the ceramic body 1. Further, the feeding portion 3 is drawn from the inside of the ceramic body 1 to the side surface on the rear end side of the ceramic body 1. The feeding portion 3 is electrically connected to the heating resistor 2 inside the ceramic body 1. In an example of the heater 10 according to the present disclosure, one end of the power supply unit 3 is connected to the heating resistor 2, and the other end of the power supply unit 3 is joined to the lead terminal 4 on the side surface on the rear end side.
また、本開示のヒータ１０の一例において、給電部３は、発熱抵抗体２に接合されている部分からセラミック体１の後端側まで伸びるように形成されている部分と、セラミック体１の後端側においてセラミック体１の内部からセラミック体１の側面まで伸びるように形成される部分とを有している。また、発熱抵抗体２が折り返し形状を有している場合においては、給電部３は、発熱抵抗体２の両端にそれぞれ設けられていてもよい。この場合は、一方の給電部３が、セラミック体１の後端側の側面に引き出されていればよい。
Further, in an example of the heater 10 of the present disclosure, the power feeding portion 3 is formed to extend from the portion joined to the heating resistor 2 to the rear end side of the ceramic body 1 and the back of the ceramic body 1. At the end side, there is a portion formed to extend from the inside of the ceramic body 1 to the side surface of the ceramic body 1. Further, in the case where the heat generating resistor 2 has a folded shape, the feed portions 3 may be provided at both ends of the heat generating resistor 2 respectively. In this case, one of the feeding parts 3 may be drawn out to the side surface on the rear end side of the ceramic body 1.
給電部３は、例えばタングステンまたは炭化タングステン、窒化タングステン、モリブデン、あるいはこれらに窒化珪素等のセラミック粉末を含有した金属材料を有する。給電部３は、例えば断面積を発熱抵抗体２よりも大きくすることによって、単位長さ辺りの抵抗値が低くなっていてもよい。これにより、給電部３における発熱量を低減することができる。給電部３の寸法は、例えば幅を０．１～５ｍｍに、厚みを０．００５～０．３ｍｍに、全長を１～１００ｍｍにすることができる。
The feeding portion 3 has a metal material containing, for example, tungsten or tungsten carbide, tungsten nitride, molybdenum, or ceramic powder such as silicon nitride. For example, by making the cross-sectional area larger than the heating resistor 2, the resistance value per unit length may be low. Thereby, the calorific value in the feed section 3 can be reduced. The dimensions of the feeding portion 3 can be, for example, 0.1 to 5 mm in width, 0.005 to 0.3 mm in thickness, and 1 to 100 mm in total length.
リード端子４は、給電部３に電気を供給するための部材である。リード端子４は、外部電源に電気的に接続されている。これにより、給電部３に電気を供給することができる。リード端子４は、セラミック体１の後端側の側面に固定されている。本開示の一例のヒータ１０において、リード端子４は、セラミック体１の後端側の側面で給電部３に接合されている。また、本開示の一例のヒータ１０において、リード端子４は、給電部３に接合されている部分において、接合材５によってセラミック体１に固定されている。リード端子４は、例えば線状に形成されている。リード端子４は、例えば、ニッケル、鉄またはニッケル系耐熱合金等の金属材料を有する。リード端子４の寸法は、例えば直径０．５～２．０ｍｍに、全長を５～５０ｍｍにすることができる。
The lead terminal 4 is a member for supplying electricity to the feeding unit 3. The lead terminal 4 is electrically connected to an external power supply. Thereby, electricity can be supplied to the feeding unit 3. The lead terminal 4 is fixed to the side surface on the rear end side of the ceramic body 1. In the heater 10 according to an example of the present disclosure, the lead terminal 4 is joined to the feeding portion 3 at the rear end side of the ceramic body 1. Further, in the heater 10 according to an example of the present disclosure, the lead terminal 4 is fixed to the ceramic body 1 by the bonding material 5 in a portion bonded to the power feeding unit 3. The lead terminal 4 is formed in, for example, a linear shape. The lead terminal 4 has, for example, a metal material such as nickel, iron or a nickel-based heat-resistant alloy. The dimensions of the lead terminal 4 can be, for example, a diameter of 0.5 to 2.0 mm and a total length of 5 to 50 mm.
接合材５は、セラミック体１とリード端子４とを接合するための部材である。接合材５は、セラミック体１の表面に設けられている。接合材５は、リード端子４と給電部３とが接合されている部分にのみ設けられていてもよいし、セラミック体１の側面に広がるように設けられていてもよい。接合材５が、セラミック体１の側面に広がるように設けられていることにより、セラミック体１の側面において、セラミック体１とリード端子４とが接合される領域を広げることができる。そのため、セラミック体１とリード端子４との接合強度を高めることができる。その結果、ヒータ１０の長期信頼性を向上させることができる。接合材５としては、例えば半田または銀ろう等のろう材を用いることができる。セラミック体１の側面には、メタライズが設けられており、メタライズの表面に接合材５が設けられていてもよい。また、メタライズは、セラミック体１の後端面１１の全体に設けられていてもよい。
The bonding material 5 is a member for bonding the ceramic body 1 and the lead terminal 4. The bonding material 5 is provided on the surface of the ceramic body 1. The bonding material 5 may be provided only at the portion where the lead terminal 4 and the feeding portion 3 are bonded, or may be provided so as to spread on the side surface of the ceramic body 1. Since the bonding material 5 is provided so as to spread on the side surface of the ceramic body 1, the region where the ceramic body 1 and the lead terminal 4 are bonded can be expanded on the side surface of the ceramic body 1. Therefore, the bonding strength between the ceramic body 1 and the lead terminal 4 can be enhanced. As a result, the long-term reliability of the heater 10 can be improved. As the bonding material 5, for example, a brazing material such as solder or silver brazing can be used. Metallization may be provided on the side surface of the ceramic body 1, and the bonding material 5 may be provided on the surface of the metallization. The metallization may be provided on the entire rear end surface 11 of the ceramic body 1.
リード端子４は、図１に示すように、セラミック体１の後端側の側面に固定されている部分からセラミック体１の後端面１１より後方まで伸びる第１部分４１を有している。ここでいう後端面１１とは、セラミック体１の後端側の端面を意味している。また、ここでいう「後端面１１より後方」とは、図１に一点鎖線で示す、セラミック体１の後端面１１を含む仮想面上、または、当該仮想面から見て、セラミック体１から離れる方向を意味している。図１に示すように、第１部分４１は、セラミック体１の後端面１１より後方まで、まっすぐ伸びていてもよい。このときに、第１部分４１の寸法は、例えば長さを０．１～１０ｍｍにすることができる。
As shown in FIG. 1, the lead terminal 4 has a first portion 41 extending from the portion fixed to the side surface on the rear end side of the ceramic body 1 to the rear from the rear end surface 11 of the ceramic body 1. The rear end face 11 here means an end face on the rear end side of the ceramic body 1. In addition, “rearward from the rear end surface 11” as used herein means a virtual surface including the rear end surface 11 of the ceramic body 1 shown by an alternate long and short dash line in FIG. It means the direction. As shown in FIG. 1, the first portion 41 may extend straight to the rear of the rear end surface 11 of the ceramic body 1. At this time, the dimension of the first portion 41 can be, for example, 0.1 to 10 mm in length.
また、図２に示すように、リード端子４は、第１部分４１に連続しており、後端面１１に対して垂直な方向から見たときにセラミック体１に重なる第２部分４２を有している。第２部分４２は、一端と他端とを有しており、一端が第１部分４１に連続している。このときに、第２部分４２の寸法は、例えば長さを０．２～１０ｍｍにすることができる。
Further, as shown in FIG. 2, the lead terminal 4 has a second portion 42 which is continuous with the first portion 41 and overlaps the ceramic body 1 when viewed in a direction perpendicular to the rear end face 11. ing. The second portion 42 has one end and the other end, and one end is continuous with the first portion 41. At this time, the dimension of the second portion 42 can be, for example, 0.2 to 10 mm in length.
また、第２部分４２は、後端面１１に対して垂直な方向から見たときにセラミック体１の外側からセラミック体１の中心に向かって伸びていてもよい。これにより、第２部分４２が第２部分４２の他端側に向かって引っ張られたときに、リード端子がセラミック体を押す方向に力が加わる。そのため、セラミック体から剥がれる方向に加わる力を低減できる。その結果、リード端子がセラミック体から剥がれるおそれを低減できる。また、第２部分４２を後端面１１に対して垂直な方向から見たときに、第２部分４２の他端が、セラミック体１の中心に位置しているとよい。これにより、第２部分４２の他端とヒータ１０後方に位置する外部電源とを電気的に接続する場合において、装置全体がセラミック体１の径方向に広がらず、小型化することができる。その結果、ヒータ１０の実装性を高めることができる。
In addition, the second portion 42 may extend from the outside of the ceramic body 1 toward the center of the ceramic body 1 when viewed in the direction perpendicular to the rear end face 11. Thereby, when the second portion 42 is pulled toward the other end side of the second portion 42, a force is applied in the direction in which the lead terminal pushes the ceramic body. Therefore, the force applied in the direction of peeling from the ceramic body can be reduced. As a result, the risk of peeling the lead terminal from the ceramic body can be reduced. In addition, when the second portion 42 is viewed in a direction perpendicular to the rear end surface 11, the other end of the second portion 42 may be located at the center of the ceramic body 1. As a result, when the other end of the second portion 42 and the external power source located behind the heater 10 are electrically connected, the entire device does not spread in the radial direction of the ceramic body 1 and can be miniaturized. As a result, the mountability of the heater 10 can be enhanced.
本開示の一例のヒータ１０においては、図１に示すように、セラミック体１と第２部分４２との間に、隙間を有している。これにより、第２部分４２に外力が加わったときに、第２部分４２が変形することができる。このときに、第２部分４２が変形することによって、第２部分４２が外力を吸収することができる。そのため、セラミック体１とリード端子４との接合部に応力が集中するおそれを低減することができる。これにより、セラミック体１とリード端子４との接合部が破損するおそれを低減することができる。その結果、ヒータ１０の耐久性を向上させることができる。このときに、第２部分４２の他端は、例えばセラミック体１の端面から０．０１～１ｍｍ離れている。
In the heater 10 according to an example of the present disclosure, as shown in FIG. 1, a gap is provided between the ceramic body 1 and the second portion 42. Thus, when an external force is applied to the second portion 42, the second portion 42 can be deformed. At this time, the second portion 42 can absorb an external force by deformation of the second portion 42. Therefore, it is possible to reduce the possibility that stress is concentrated on the bonding portion between the ceramic body 1 and the lead terminal 4. Thus, the possibility of breakage of the joint between the ceramic body 1 and the lead terminal 4 can be reduced. As a result, the durability of the heater 10 can be improved. At this time, the other end of the second portion 42 is, for example, 0.01 to 1 mm away from the end face of the ceramic body 1.
また、図３に示すように、第１部分４１と第２部分４２とが、滑らかに連続していてもよい。これにより、リード端子４のうち第２部分４２に外力が加わったときに、第１部分４１と第２部分４２とが連続する部分に生じる応力を分散させることができる。そのため、第１部分４１と第２部分４２とが連続する部分が破損するおそれを低減することができる。その結果、リード端子４の耐久性を向上させることができる。なお、ここでいう「滑らかに連続」とは、第１部分４１の側面と第２部分４２の側面とが曲面を形成するように連続している状態を意味している。
Further, as shown in FIG. 3, the first portion 41 and the second portion 42 may be smoothly continuous. Thereby, when an external force is applied to the second portion 42 of the lead terminal 4, it is possible to disperse the stress generated in the portion where the first portion 41 and the second portion 42 are continuous. Therefore, it is possible to reduce the possibility that the portion where the first portion 41 and the second portion 42 are continuous may be damaged. As a result, the durability of the lead terminal 4 can be improved. Here, “smoothly continuous” means that the side surface of the first portion 41 and the side surface of the second portion 42 are continuous so as to form a curved surface.
また、図４に示すように、第２部分４２が湾曲していてもよい。これにより、第２部分４２に外力が加わったときに、第２部分４２に生じる応力を分散させることができる。そのため、リード端子４のうち一部分に応力が集中し、リード端子４が破損するおそれを低減することができる。その結果、ヒータ１０の耐久性を向上させることができる。また、図４に示すように、第２部分４２が、セラミック体１の後端面１１から離れる方向に凸な弧状であってもよい。この場合においては、第２部分４２に対してセラミック体１の軸方向の振動が加わったときに、第２部分４２が変形することによって振動を吸収することができる。これにより、セラミック体１とリード端子４との接合部に応力が集中するおそれを低減することができる。そのため、リード端子４が破損するおそれを低減することができる。その結果、ヒータ１０の耐久性を向上させることができる。
In addition, as shown in FIG. 4, the second portion 42 may be curved. Thereby, when an external force is applied to the second portion 42, the stress generated in the second portion 42 can be dispersed. Therefore, stress is concentrated on a part of the lead terminal 4 and the possibility of breakage of the lead terminal 4 can be reduced. As a result, the durability of the heater 10 can be improved. In addition, as shown in FIG. 4, the second portion 42 may have an arc shape which is convex in a direction away from the rear end surface 11 of the ceramic body 1. In this case, when vibration in the axial direction of the ceramic body 1 is applied to the second portion 42, the vibration can be absorbed by deformation of the second portion 42. As a result, the possibility of stress concentration on the joint between the ceramic body 1 and the lead terminal 4 can be reduced. Therefore, the risk of damage to the lead terminal 4 can be reduced. As a result, the durability of the heater 10 can be improved.
また、図５に示すように、第２部分４２が、セラミック体１の後端面１１に向かう方向に凸な弧状であってもよい。この場合においては、例えば図５中の白抜き矢印で示すように、第２部分４２に対して第２部分４２の一端側に向かう方向に外力が加わったときに、第２部分４２が変形することによって外力を吸収することができる。これにより、セラミック体１とリード端子４との接合部に応力が集中するおそれを低減することができる。そのため、リード端子４がセラミック体１から剥がれにくくすることができる。その結果、ヒータ１０の耐久性を向上させることができる。
Further, as shown in FIG. 5, the second portion 42 may have an arc shape convex in the direction toward the rear end surface 11 of the ceramic body 1. In this case, the second portion 42 is deformed when an external force is applied to the second portion 42 in a direction toward one end side of the second portion 42, as indicated by an outline arrow in FIG. 5, for example. Thus, external force can be absorbed. As a result, the possibility of stress concentration on the joint between the ceramic body 1 and the lead terminal 4 can be reduced. Therefore, the lead terminal 4 can be made difficult to peel off from the ceramic body 1. As a result, the durability of the heater 10 can be improved.
また、図６に示すように、リード端子４が、第２部分４２に連続しており、後端面１１から離れる方向に伸びる第３部分４３をさらに有していてもよい。これにより、第３部分４３が外力を受けてセラミック体１の方向に押されたときに、第２部分４２と第３部分４３とが連続している部分および第１部分４１と第２部分４２とが連続している部分の２箇所において、リード端子４が変形することができる。その結果、リード端子４が外力を吸収することができる。そのため、セラミック体１とリード端子４との接合部に応力が集中するおそれを低減することができる。これにより、セラミック体１とリード端子４との接合部が破損するおそれを低減することができる。その結果、ヒータ１０の耐久性を向上させることができる。このときに、第３部分４３の寸法は、例えば長さを１～１００ｍｍにすることができる。
Further, as shown in FIG. 6, the lead terminal 4 may further include a third portion 43 which is continuous with the second portion 42 and extends in a direction away from the rear end surface 11. Thereby, when the third portion 43 receives an external force and is pushed in the direction of the ceramic body 1, a portion where the second portion 42 and the third portion 43 are continuous, and the first portion 41 and the second portion 42. The lead terminal 4 can be deformed at two points of the continuous portion. As a result, the lead terminal 4 can absorb an external force. Therefore, it is possible to reduce the possibility that stress is concentrated on the bonding portion between the ceramic body 1 and the lead terminal 4. Thus, the possibility of breakage of the joint between the ceramic body 1 and the lead terminal 4 can be reduced. As a result, the durability of the heater 10 can be improved. At this time, the dimension of the third portion 43 can be, for example, 1 to 100 mm in length.
また、第３部分４３が、セラミック体１の後端面１１に対して垂直な方向に伸びる部分を有していてもよい。これにより、セラミック体１の後端面１１に対して垂直な方向に伸びる部分を有していない場合と比較して、セラミック体１の後方に位置する部材に電気的に接続するために必要なリード端子４の長さを短くすることができる。その結果、ヒータ１０の製造のコストを削減することができる。
In addition, the third portion 43 may have a portion extending in a direction perpendicular to the rear end surface 11 of the ceramic body 1. Thereby, a lead necessary for electrically connecting to a member positioned behind ceramic body 1 as compared to the case where there is no part extending in a direction perpendicular to rear end face 11 of ceramic body 1. The length of the terminal 4 can be shortened. As a result, the cost of manufacturing the heater 10 can be reduced.
また、図７に示すように、第２部分４２と第３部分４３とが、滑らかに連続していてもよい。これにより、リード端子４のうち第３部分４３に外力が加わったときに、第２部分４２と第３部分４３とが連続する部分に加わる応力を分散させることができる。そのため、第２部分４２と第３部分４３とが連続する部分が破損するおそれを低減することができる。その結果、リード端子４の耐久性を向上させることができる。なお、ここでいう「滑らかに連続」とは、第２部分４２の側面と第３部分４３の側面とが曲面を形成するように連続している状態を意味している。
Further, as shown in FIG. 7, the second portion 42 and the third portion 43 may be smoothly continuous. Thereby, when an external force is applied to the third portion 43 of the lead terminal 4, it is possible to disperse the stress applied to the portion where the second portion 42 and the third portion 43 are continuous. Therefore, the possibility that the part which the 2nd part 42 and the 3rd part 43 continue may be damaged can be reduced. As a result, the durability of the lead terminal 4 can be improved. Here, “smoothly continuous” means that the side surface of the second portion 42 and the side surface of the third portion 43 are continuous so as to form a curved surface.
また、図８に示すように、第２部分４２が、後端面１１から離れる方向に伸びており、接合材５によって後端面１１の外縁部分に接合されていてもよい。これにより、接合材５によってセラミック体１とリード端子４との接合強度を高めつつ、第２部分４２に外力が加わったときに、第２部分４２が変形する隙間を設けることができる。その結果、リード端子４とセラミック体１との接合部が破損するおそれをより低減することができる。その結果、ヒータ１０の耐久性を向上させることができる。
Further, as shown in FIG. 8, the second portion 42 may extend in the direction away from the rear end surface 11 and may be bonded to the outer edge portion of the rear end surface 11 by the bonding material 5. As a result, while the bonding strength between the ceramic body 1 and the lead terminal 4 is increased by the bonding material 5, it is possible to provide a gap in which the second portion 42 is deformed when an external force is applied to the second portion 42. As a result, it is possible to further reduce the possibility of breakage of the joint between the lead terminal 4 and the ceramic body 1. As a result, the durability of the heater 10 can be improved.
ここでいう外縁部分とは、例えば、セラミック体１の後端面１１の形状が円形状の場合は、後端面１１のうち後端面１１に対して直径が半分で中心が同一の仮想円の外側の領域である。また、セラミック体１の後端面１１の形状が四角形状の場合は、後端面１１のうち後端面１１に対して相似形状で一辺の長さが半分で中心が同一の仮想四角形の外側の領域である。
Here, when the shape of the rear end surface 11 of the ceramic body 1 is circular, for example, the outer edge portion is an outer side of an imaginary circle having a half diameter and the same center as the rear end surface 11 of the rear end surface 11. It is an area. In the case where the shape of rear end face 11 of ceramic body 1 is a quadrilateral, it is a similar shape to rear end face 11 of rear end face 11 in a region outside a virtual quadrilateral whose half length is half and whose center is the same. is there.
また、図９に示すように、第１部分４１が、セラミック体１の外周面をセラミック体１の周方向に囲みながら伸びていてもよい。言い換えると、第１部分４１が螺旋状にセラミック体１の外周面を取り囲んでいてもよい。そのため、周方向の様々な方向からの外力に対して、第１部分４１がセラミック体１から剥がれにくくすることができる。その結果、ヒータ１０の耐久性を向上させることができる。具体的には、第１部分４１は、セラミック体１の後端側の側面を２～６回巻かれているとよい。また、セラミック体１の周方向の全体に接合材５が設けられており、セラミック体１の周方向の全体において、セラミック体１とリード端子４とが接合していてもよい。
Further, as shown in FIG. 9, the first portion 41 may extend so as to surround the outer peripheral surface of the ceramic body 1 in the circumferential direction of the ceramic body 1. In other words, the first portion 41 may spirally surround the outer peripheral surface of the ceramic body 1. Therefore, the first portion 41 can be hardly peeled off from the ceramic body 1 against external force from various directions in the circumferential direction. As a result, the durability of the heater 10 can be improved. Specifically, the first portion 41 may be wound 2 to 6 times on the side surface on the rear end side of the ceramic body 1. In addition, the bonding material 5 may be provided on the whole of the ceramic body 1 in the circumferential direction, and the ceramic body 1 and the lead terminal 4 may be bonded on the whole of the ceramic body 1 in the circumferential direction.
また、図１０に示すように、第２部分４２が、後端面１１に対して垂直な方向から見たときに湾曲していてもよい。これにより、図１０の白抜き矢印に示すように、第２部分４２に対して第２部分４２の一端側に向かう方向に外力が加わった場合において、第２部分４２を変形しやすくすることができる。このときに、第２部分４２が変形するため、第２部分４２が外力を吸収することができる。そのため、セラミック体１とリード端子４との接合部に応力が集中するおそれを低減することができる。これにより、セラミック体１とリード端子４との接合部が破損するおそれを低減することができる。その結果、ヒータ１０の耐久性を向上させることができる。
Further, as shown in FIG. 10, the second portion 42 may be curved when viewed in a direction perpendicular to the rear end surface 11. Thereby, as shown by the white arrow in FIG. 10, when an external force is applied to the second portion 42 in a direction toward one end side of the second portion 42, the second portion 42 can be easily deformed. it can. At this time, since the second portion 42 is deformed, the second portion 42 can absorb the external force. Therefore, it is possible to reduce the possibility that stress is concentrated on the bonding portion between the ceramic body 1 and the lead terminal 4. Thus, the possibility of breakage of the joint between the ceramic body 1 and the lead terminal 4 can be reduced. As a result, the durability of the heater 10 can be improved.
なお、図１、図６、図７および図８に示すように第１部分４１から第２部分４２にかけてリード端子４が屈曲している場合は、例えば断面視または側面視したときにリード端子４の内側の折れ線の頂点と外側の折れ線の頂点とを結ぶ線を、第１部分４１と第２部分４２との境界とすることができる。
When the lead terminal 4 is bent from the first portion 41 to the second portion 42 as shown in FIG. 1, FIG. 6, FIG. 7 and FIG. The line connecting the vertex of the inner broken line and the vertex of the outer broken line can be used as the boundary between the first portion 41 and the second portion 42.
また図３、図４および図５に示すように第１部分４１から第２部分４２にかけてリード端子４が湾曲している場合は、例えば断面視または側面視したときにリード端子４の内側の湾曲の始点と外側の湾曲の始点とを結ぶ線を第１部分４１と第２部分４２との境界とすることができる。
When the lead terminal 4 is curved from the first portion 41 to the second portion 42 as shown in FIG. 3, FIG. 4 and FIG. 5, for example, the inner curve of the lead terminal 4 when viewed in cross section or side A line connecting the start point of the first portion and the start point of the outer curve can be used as the boundary between the first portion 41 and the second portion 42.
なお、図６および図８に示すように第２部分４２から第３部分４３にかけてリード端子４が屈曲している場合は、例えば断面視または側面視したときにリード端子４の内側の折れ線の頂点と外側の折れ線の頂点とを結ぶ線を、第２部分４２と第３部分４３との境界とすることができる。
When the lead terminal 4 is bent from the second portion 42 to the third portion 43 as shown in FIGS. 6 and 8, for example, the apex of a broken line inside the lead terminal 4 when viewed in cross section or in a side view. A line connecting the second portion 42 and the vertex of the outer broken line can be used as the boundary between the second portion 42 and the third portion 43.
また図７および図９に示すように第２部分４２から第３部分４３にかけてリード端子４が湾曲している場合は、例えば断面視または側面視したときにリード端子４の内側の湾曲の終点と外側の湾曲の終点とを結ぶ線を第２部分４２と第３部分４３との境界とすることができる。
When the lead terminal 4 is curved from the second portion 42 to the third portion 43 as shown in FIGS. 7 and 9, for example, the end point of the inner curve of the lead terminal 4 when viewed in cross section or in a side view A line connecting the end point of the outer curve can be a boundary between the second portion 42 and the third portion 43.
１：セラミック体
１１：後端面
２：発熱抵抗体
３：給電部
４：リード端子
４１：第１部分
４２：第２部分
４３：第３部分
５：接合材
１０：ヒータ 1: Ceramic body 11: Rear end face 2: Heating resistor 3: Feeding part 4: Lead terminal 41: First part 42: Second part 43: Third part 5: Bonding material 10: Heater
１１：後端面
２：発熱抵抗体
３：給電部
４：リード端子
４１：第１部分
４２：第２部分
４３：第３部分
５：接合材
１０：ヒータ 1: Ceramic body 11: Rear end face 2: Heating resistor 3: Feeding part 4: Lead terminal 41: First part 42: Second part 43: Third part 5: Bonding material 10: Heater
Claims (6)
- 棒状または筒状のセラミック体と、該セラミック体の先端側に埋設された発熱抵抗体と、該発熱抵抗体に電気的に接続されており、前記セラミック体に埋設されて前記セラミック体の後端側の側面に引き出された給電部と、該給電部に電気的に接続されており、前記セラミック体の後端側の側面に固定されているリード端子とを有しており、
該リード端子は、前記セラミック体の後端側の側面に固定されている部分から前記セラミック体の後端面より後方まで伸びる第１部分と、該第１部分に連続しており、前記後端面に対して垂直な方向から見たときに前記セラミック体に重なる第２部分とを有しており、
前記セラミック体と前記第２部分との間に、隙間を有していることを特徴とするヒータ。 A rod-like or cylindrical ceramic body, a heating resistor embedded on the front end side of the ceramic body, and the heating resistor are electrically connected, and are embedded in the ceramic body and the rear end of the ceramic body A feeding portion drawn to the side surface of the side, and a lead terminal electrically connected to the feeding portion and fixed to the side surface on the rear end side of the ceramic body,
The lead terminal is continuous with a first portion extending from the portion fixed to the side surface on the rear end side of the ceramic body to the rear from the rear end surface of the ceramic body, and the first portion. And a second portion overlapping the ceramic body when viewed in a direction perpendicular to the direction
A heater having a gap between the ceramic body and the second portion. - 前記第１部分と前記第２部分とが、滑らかに連続していることを特徴とする請求項１に記載のヒータ。 The heater according to claim 1, wherein the first portion and the second portion are smoothly continuous.
- 前記第２部分が、湾曲していることを特徴とする請求項１または請求項２に記載のヒータ。 The heater according to claim 1, wherein the second portion is curved.
- 前記リード端子が、前記第２部分に連続しており、前記後端面から離れる方向に伸びる第３部分をさらに有することを特徴とする請求項１乃至請求項３のいずれかに記載のヒータ。 The heater according to any one of claims 1 to 3, wherein the lead terminal further includes a third portion which is continuous with the second portion and extends in a direction away from the rear end surface.
- 前記第２部分と前記第３部分とが、滑らかに連続していることを特徴とする請求項４に記載のヒータ。 The heater according to claim 4, wherein the second portion and the third portion are smoothly continuous.
- 前記第２部分が、前記後端面から離れる方向に伸びており、接合材によって前記後端面の外縁部分に接合されていることを特徴とする請求項１乃至請求項５のいずれかに記載のヒータ。 The heater according to any one of claims 1 to 5, wherein the second portion extends in a direction away from the rear end surface, and is bonded to the outer edge portion of the rear end surface by a bonding material. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019526981A JPWO2019004286A1 (en) | 2017-06-28 | 2018-06-27 | heater |
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| JP2017-126621 | 2017-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2018/024376 WO2019004286A1 (en) | 2017-06-28 | 2018-06-27 | Heater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7433200B2 (en) | 2020-12-01 | 2024-02-19 | 京セラ株式会社 | heater |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001267044A (en) * | 2000-03-23 | 2001-09-28 | Ngk Spark Plug Co Ltd | Ceramic heater and manufacturing method therefor |
| JP2006049279A (en) * | 2004-06-29 | 2006-02-16 | Ngk Spark Plug Co Ltd | Ceramic heater, glow plug, and ceramic heater manufacturing method |
| JP2009224317A (en) * | 2008-02-20 | 2009-10-01 | Ngk Spark Plug Co Ltd | Ceramic heater and glow plug |
| JP2016525202A (en) * | 2013-06-26 | 2016-08-22 | ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Glow plug |
-
2018
- 2018-06-27 JP JP2019526981A patent/JPWO2019004286A1/en active Pending
- 2018-06-27 WO PCT/JP2018/024376 patent/WO2019004286A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001267044A (en) * | 2000-03-23 | 2001-09-28 | Ngk Spark Plug Co Ltd | Ceramic heater and manufacturing method therefor |
| JP2006049279A (en) * | 2004-06-29 | 2006-02-16 | Ngk Spark Plug Co Ltd | Ceramic heater, glow plug, and ceramic heater manufacturing method |
| JP2009224317A (en) * | 2008-02-20 | 2009-10-01 | Ngk Spark Plug Co Ltd | Ceramic heater and glow plug |
| JP2016525202A (en) * | 2013-06-26 | 2016-08-22 | ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Glow plug |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7433200B2 (en) | 2020-12-01 | 2024-02-19 | 京セラ株式会社 | heater |
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| JPWO2019004286A1 (en) | 2019-12-12 |
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