JP5229355B2 - Temperature sensor - Google Patents

Temperature sensor Download PDF

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JP5229355B2
JP5229355B2 JP2011133284A JP2011133284A JP5229355B2 JP 5229355 B2 JP5229355 B2 JP 5229355B2 JP 2011133284 A JP2011133284 A JP 2011133284A JP 2011133284 A JP2011133284 A JP 2011133284A JP 5229355 B2 JP5229355 B2 JP 5229355B2
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cylindrical member
insulating tube
temperature sensor
temperature
holding member
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JP2012093340A (en
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元樹 佐藤
孝志 児島
恒円 堀
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Denso Corp
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Denso Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/08—Protective devices, e.g. casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
    • G01K2205/04—Application of thermometers in motors, e.g. of a vehicle for measuring exhaust gas temperature

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Description

本発明は、感温素子と、貫通孔を有する絶縁管とを備え、感温素子の信号線を上記貫通孔に挿通させた温度センサに関する。   The present invention relates to a temperature sensor including a temperature sensitive element and an insulating tube having a through hole, and a signal line of the temperature sensitive element is inserted into the through hole.

車両の排気ガス等の温度を測定するための温度センサとして、図１０に示すごとく、サーミスタ等の感温素子９３と、シースピン９０とを備えるものが従来から知られている（下記特許文献１参照）。
シースピン９０は、金属製の筒状部材９２と、該筒状部材９２の内部に充填した粉末状の絶縁体９４と、感温素子９３に接続した一対の信号線９５とを備え、絶縁体９４によって一対の信号線９５を、絶縁性を確保しつつ保持している。 As a temperature sensor for measuring the temperature of exhaust gas or the like of a vehicle, as shown in FIG. 10, a sensor having a temperature sensing element 93 such as a thermistor and a sheath pin 90 has been known (see Patent Document 1 below). ).
The sheath pin 90 includes a cylindrical member 92 made of metal, a powdery insulator 94 filled in the cylindrical member 92, and a pair of signal lines 95 connected to the temperature sensing element 93. Thus, the pair of signal lines 95 are held while ensuring insulation.

シースピン９０を製造する際には、所謂しごき加工を行う。すなわち、加工後の筒状部材９２よりも外径が大きく、軸線方向長さが短い筒状部材を用意し、この中に一対の信号線９５を通すと共に、ＭｇＯ等からなる粉末状の絶縁体９４を充填する。そして、筒状部材の外径を細くしつつ軸線方向長さを長くする加工を行う。しごき加工をすることにより、絶縁体９４を密にし、筒状部材９２から絶縁体９４が抜けることを防止している。   When the sheath pin 90 is manufactured, so-called ironing is performed. That is, a cylindrical member having an outer diameter larger than that of the processed cylindrical member 92 and having a short axial length is prepared, and a pair of signal wires 95 are passed through the cylindrical member, and a powdered insulator made of MgO or the like 94 is filled. And the process which lengthens an axial direction length is performed, making the outer diameter of a cylindrical member thin. By performing the ironing process, the insulator 94 is made dense and the insulator 94 is prevented from coming off from the cylindrical member 92.

一方、シースピン９０にはリブ部９８が設けられており、このリブ部９８に外筒９００が固定されている。シースピン９０の後端側部分９０ａは、外筒９００に挿入されている。外筒９００の後端９０５には、ゴム製のブッシュ９９が取り付けられている。そして、被覆絶縁膜９６０を有し、信号線９５に接続したリード線９６が、ブッシュ９９内を通っている。また、ブッシュ９９及びリード線９６の抜け止めをするため、外筒９００の後端部９０５に加締め加工がされている。   On the other hand, the sheath pin 90 is provided with a rib portion 98, and the outer cylinder 900 is fixed to the rib portion 98. The rear end portion 90 a of the sheath pin 90 is inserted into the outer cylinder 900. A rubber bush 99 is attached to the rear end 905 of the outer cylinder 900. A lead wire 96 having a coating insulating film 960 and connected to the signal line 95 passes through the bush 99. Further, in order to prevent the bush 99 and the lead wire 96 from coming off, the rear end portion 905 of the outer cylinder 900 is crimped.

温度センサ９１は、車両の排気管９７に取り付けられる。排気管９７内を流れる排気ガスｇ（被測定体）の温度を、感温センサ９３によって測定し、エンジンの制御等に利用している。   The temperature sensor 91 is attached to the exhaust pipe 97 of the vehicle. The temperature of the exhaust gas g (measuring object) flowing in the exhaust pipe 97 is measured by a temperature sensor 93 and used for engine control and the like.

特開２０００−１６２０５１号公報JP 2000-162051 A

しかしながら従来の温度センサ９１は、シースピン９０を製造する際に、上記しごき加工を行う必要があるため、製造コストが高くなるという問題があった。   However, since the conventional temperature sensor 91 needs to perform the ironing process when manufacturing the sheath pin 90, there is a problem that the manufacturing cost is increased.

また、従来の温度センサ９１は、シースピン９０内の絶縁体９４として粉末状のセラミックスを使用しているため、吸湿しやすいという問題があった。絶縁体９４が吸湿すると、一対の信号線９５の間の絶縁性を確保しにくくなる。絶縁性が低下すると、一対の信号線９５の間に電流が流れ、正確な検出電圧を出力できなくなるという問題が生じる。   Further, since the conventional temperature sensor 91 uses powdered ceramics as the insulator 94 in the sheath pin 90, there is a problem that it is easy to absorb moisture. When the insulator 94 absorbs moisture, it becomes difficult to ensure insulation between the pair of signal lines 95. When the insulating property is lowered, a current flows between the pair of signal lines 95, which causes a problem that an accurate detection voltage cannot be output.

さらに、従来の温度センサ９１は、筒状部材９２の内部に絶縁体９４を隙間なく充填しているため、絶縁体９４から筒状部材９２へ熱伝導しやすいという問題があった。そのため、感温素子９３の熱が、絶縁体９４から筒状部材９２、さらにリブ部９８、排気管９７を順次伝わって筒状部材の周囲、もしくは排気管外へ放熱され、感温素子９３の温度が下がりやすくなる。その結果、感温素子９３の温度と、排気ガスｇの温度とが等しくなるために長い時間が必要となる。そのため、排気ガスｇの温度が変化した場合に、変化後の温度を素早く検出しにくくなる。すなわち、排気ガスｇの温度変化に対する応答性が悪いという問題が生じる。   Further, the conventional temperature sensor 91 has a problem that heat conduction from the insulator 94 to the tubular member 92 is easy because the insulator 94 is filled in the tubular member 92 without a gap. Therefore, the heat of the temperature sensing element 93 is sequentially transmitted from the insulator 94 to the cylindrical member 92, the rib portion 98, and the exhaust pipe 97 to be dissipated around the cylindrical member or outside the exhaust pipe. The temperature tends to drop. As a result, a long time is required for the temperature of the temperature sensing element 93 to be equal to the temperature of the exhaust gas g. For this reason, when the temperature of the exhaust gas g changes, it becomes difficult to quickly detect the changed temperature. That is, there arises a problem that the responsiveness to the temperature change of the exhaust gas g is poor.

また、熱が絶縁体９４から筒状部材９２へ移動しやすいと、排気ガス温度が絶縁体９４へ伝わりやすく、絶縁体９４を通して温度センサ上部へ熱が伝わるため、ブッシュ９９やリード線９６等の、排気管９７の外部に設けられている部品の温度が上昇しやすくなる。そのため、耐熱性の高い部品を使用する必要が生じ、温度センサ９１の製造コストが上昇しやすくなる。   Further, if the heat easily moves from the insulator 94 to the cylindrical member 92, the exhaust gas temperature is easily transmitted to the insulator 94, and heat is transmitted to the upper portion of the temperature sensor through the insulator 94, so that the bush 99, the lead wire 96, etc. The temperature of parts provided outside the exhaust pipe 97 is likely to rise. Therefore, it is necessary to use components having high heat resistance, and the manufacturing cost of the temperature sensor 91 is likely to increase.

本発明は、かかる問題点に鑑みてなされたもので、製造コストを低減でき、信号線の絶縁性を確保しやすく、かつ被測定体の温度変化に対する応答性が良好な温度センサを提供しようとするものである。   The present invention has been made in view of such problems, and is intended to provide a temperature sensor that can reduce the manufacturing cost, can easily ensure the insulation of the signal line, and has good responsiveness to the temperature change of the measured object. To do.

本発明は、先端が閉じた筒状部材と、
該筒状部材の内部における上記先端に設けられた感温素子と、
上記筒状部材の内部に設けられ、セラミック焼結体からなると共に、上記筒状部材の軸線方向に貫通した一対の貫通孔を有する絶縁管と、
上記感温素子に接続し、上記絶縁管の上記貫通孔内を通る一対の信号線と、
上記筒状部材を外周側から保持するリブ部とを備え、
上記筒状部材の先端側には、上記絶縁管の先端部および上記感温素子を保持する縮径部が形成され、上記筒状部材のうち上記縮径部よりも後端側は該縮径部よりも拡径しており、
その拡径した部分には、上記筒状部材の内周面と上記絶縁管の外周面との間に隙間が形成され、
上記軸線方向において、上記隙間の長さは上記縮径部の長さよりも長く、
上記筒状部材との間に上記隙間を設けた状態で上記絶縁管を保持する保持部材が、上記筒状部材に取り付けられており、
上記保持部材は弾性体からなり、
上記保持部材は、上記リブ部よりも上記軸線方向における後端側に取り付けられていることを特徴とする温度センサにある（請求項１）。 The present invention includes a cylindrical member having a closed tip,
A temperature sensing element provided at the tip in the cylindrical member;
An insulating tube provided inside the cylindrical member, made of a ceramic sintered body, and having a pair of through holes penetrating in the axial direction of the cylindrical member;
A pair of signal lines connected to the temperature sensitive element and passing through the through hole of the insulating tube ;
A rib portion for holding the cylindrical member from the outer peripheral side ,
On the distal end side of the tubular member, a distal end portion of the insulating tube and a reduced diameter portion for holding the temperature sensing element are formed, and the rear end side of the tubular member from the reduced diameter portion is the reduced diameter portion. The diameter is larger than the part,
In the expanded diameter portion , a gap is formed between the inner peripheral surface of the cylindrical member and the outer peripheral surface of the insulating tube,
In the axial direction, the length of the gap is longer than the length of the reduced diameter portion,
A holding member that holds the insulating tube in a state where the gap is provided between the cylindrical member and the cylindrical member is attached to the cylindrical member,
The holding member is made of an elastic body,
The holding member is attached to a rear end side in the axial direction with respect to the rib portion (claim 1).

本発明の作用効果について説明する。本発明では、一対の信号線の間の電気的絶縁を確保するための絶縁部材（絶縁管）を、粉末状のセラミックを使用して形成するのではなく、セラミック焼結体を用いて形成した。そして、この絶縁管に設けた貫通孔に、上記信号線を挿通させた。
上記絶縁管はセラミック焼結体からなるため、上記構造にすると、絶縁管が吸湿しにくくなり、一対の信号線の間の絶縁性が低下しにくくなる。
また、本発明では、従来のようにしごき加工を行う必要が無いため、温度センサの製造コストを低減できる。 The function and effect of the present invention will be described. In the present invention, an insulating member (insulating tube) for securing electrical insulation between a pair of signal lines is formed using a ceramic sintered body, not using powdered ceramic. . And the said signal wire was penetrated to the through-hole provided in this insulating tube.
Since the insulating tube is made of a ceramic sintered body, the above structure makes it difficult for the insulating tube to absorb moisture, and the insulation between the pair of signal lines is difficult to decrease.
Further, according to the present invention, since there is no need to perform ironing as in the prior art, the manufacturing cost of the temperature sensor can be reduced.

また、本発明では、絶縁管の軸線方向における少なくとも一部の区間において、筒状部材の内周面と絶縁管の外周面との間に隙間を設けた。
このようにすると、筒状部材と絶縁管との間に隙間が形成されているため、絶縁管から筒状部材へ熱伝導しにくくなる。そのため、感温素子の熱が絶縁管を通って筒状部材へ伝わり、さらに筒状部材の周囲に放熱されたり、リブ、排気管へと熱伝導することによって、排気管外に放熱されたりするという不具合を防止できる。その結果、感温素子の温度と被測定体の温度とが等しくなりやすくなり、被測定体の温度が変化した場合に、変化後の温度を素早く検出することが可能になる。すなわち、被測定体の温度変化に対する応答性が良好になる。 In the present invention, a gap is provided between the inner peripheral surface of the tubular member and the outer peripheral surface of the insulating tube in at least a part of the section in the axial direction of the insulating tube.
If it does in this way, since the clearance gap is formed between the cylindrical member and the insulating tube, it will become difficult to conduct heat from an insulating tube to a cylindrical member. Therefore, the heat of the temperature sensing element is transmitted to the tubular member through the insulating tube, and further radiated to the periphery of the tubular member, or radiated to the outside of the exhaust pipe by conducting heat to the rib and the exhaust pipe. Can be prevented. As a result, the temperature of the temperature sensing element and the temperature of the measured object are likely to be equal, and when the temperature of the measured object changes, the changed temperature can be detected quickly. That is, the response to the temperature change of the measured object is improved.

また、本発明の温度センサは、上記絶縁管を保持する保持部材を有する。そのため、温度センサに外部から何らかの力が加わり、振動した場合でも、絶縁管を筒状部材に対して保持することができる。そのため、絶縁管が径方向に揺れにくくなり、細くて長い絶縁管を用いた場合でも、絶縁管が破損しにくくなる。   Moreover, the temperature sensor of this invention has a holding member holding the said insulating tube. Therefore, even when some force is applied to the temperature sensor from the outside and vibrates, the insulating tube can be held against the cylindrical member. For this reason, the insulating tube is less likely to shake in the radial direction, and even when a thin and long insulating tube is used, the insulating tube is not easily damaged.

また、上記保持部材は、筒状部材との間に隙間を設けた状態で上記絶縁管を保持している。そのため、保持部材の位置や、隙間の大きさを調整することにより、振動によるストレス（応力）を低減することができる。したがって、高い振動ストレスがかかる環境においても絶縁管が割れたり、リード線が断線したりする不具合を防止できる。   Further, the holding member holds the insulating tube in a state where a gap is provided between the holding member and the cylindrical member. Therefore, the stress (stress) due to vibration can be reduced by adjusting the position of the holding member and the size of the gap. Therefore, it is possible to prevent problems such as breakage of the insulating tube and disconnection of the lead wire even in an environment where high vibration stress is applied.

以上のごとく、本発明によれば、製造コストを低減でき、信号線の絶縁性を確保しやすく、かつ被測定体の温度変化に対する応答性が良好であり、耐振性に優れた温度センサを提供することができる。   As described above, according to the present invention, it is possible to reduce the manufacturing cost, to easily ensure the insulation of the signal line, to provide a response to temperature change of the measurement object, and to provide a temperature sensor excellent in vibration resistance. can do.

実施例１における、温度センサの断面図。FIG. 3 is a cross-sectional view of the temperature sensor in the first embodiment. 図１の要部拡大断面図。The principal part expanded sectional view of FIG. 実施例１における、絶縁管の拡大斜視図。FIG. 3 is an enlarged perspective view of an insulating tube in the first embodiment. 実施例１における、保持部材の拡大図。The enlarged view of the holding member in Example 1. FIG. 実施例１における、保持部材の斜視図。3 is a perspective view of a holding member in Embodiment 1. FIG. 実施例２における、温度センサの要部拡大断面図。The principal part expanded sectional view of the temperature sensor in Example 2. FIG. 実施例３における、温度センサの要部拡大断面図。The principal part expanded sectional view of the temperature sensor in Example 3. FIG. 実施例３における、筒状部分の第２部分まで高熱伝導材料を充填した温度センサの要部拡大断面図。The principal part expanded sectional view of the temperature sensor which filled the high thermal conductivity material to the 2nd part of the cylindrical part in Example 3. FIG. 実施例４における、温度センサの要部拡大断面図。The principal part expanded sectional view of the temperature sensor in Example 4. FIG. 従来例における、温度センサの断面図。Sectional drawing of the temperature sensor in a prior art example.

上述した本発明における好ましい実施の形態につき説明する。
本発明において、上記筒状部材のうち上記感温素子を配置した部分は、上記隙間を設けた部分よりも縮径している。
したがって、感温素子と筒状部材との間の隙間が小さくなるため、被測定体の温度と感温素子の温度とが等しくなりやすい。そのため、被測定体の温度変化に対する応答性が一層、良好になる。 A preferred embodiment of the present invention described above will be described.
In the present invention, the sense portion and the temperature detecting element is disposed out of the tubular member, that have a reduced diameter than the portion provided with the gap.
Therefore , since the gap between the temperature sensitive element and the cylindrical member is reduced, the temperature of the measured object and the temperature of the temperature sensitive element tend to be equal. Therefore, the responsiveness to the temperature change of the measured object is further improved.

また、上記筒状部材は、内側に上記感温素子を配置した部分と、上記絶縁管の外周面との間に上記隙間を設けた部分とが一体に形成されていることが好ましい（請求項２）。
この場合には、筒状部材に腐食等が生じにくくなる。すなわち、内側に感温素子を配置した部分と、上記隙間を設けた部分との２つの部分を、それぞれ別部材として形成し、溶接等を行って接続することもできるが、この場合には、溶接によって鋭敏化が起きるため（例えば、結晶粒界にＣｒ２３Ｃ６が生成されて粒界のＣｒ濃度が下がる）、溶接部が腐食しやすくなることがある。また、溶接時に、溶接部に熱応力が加わりやすいという問題もある。しかしながら、上記２つの部分を一体形成すれば、溶接等を行う必要がなくなり、溶接部が腐食する等の不具合が生じにくくなる。 Further, it is preferable that the cylindrical member is integrally formed with a portion where the temperature sensing element is disposed inside and a portion where the gap is provided between the outer peripheral surface of the insulating tube. 2 ).
In this case, corrosion or the like hardly occurs in the cylindrical member. That is, the two parts, the part where the temperature sensing element is arranged on the inside and the part where the gap is provided, can be formed as separate members and connected by welding or the like. Since sensitization occurs by welding (for example, Cr 23 C 6 is generated at the grain boundaries and the Cr concentration at the grain boundaries decreases), the welded portion may be easily corroded. Further, there is a problem that thermal stress is easily applied to the welded part during welding. However, if the two parts are integrally formed, it is not necessary to perform welding or the like, and problems such as corrosion of the welded part are less likely to occur.

また、上記保持部材は、上記筒状部材の内周面を径方向外側へ付勢することにより上記保持部材を上記筒状部材に固定する筒側部分と、上記絶縁管の外周面を取り囲む絶縁管側部分と、上記筒側部分と上記絶縁管側部分とを繋ぐ接続部とを備えることが好ましい（請求項３）。
このようにすると、上記筒側部分が筒状部材の内周面を径方向外側へ付勢しているため、この筒側部分によって、保持部材を筒状部材に対してしっかりと固定できる。そのため、温度センサが振動しても、保持部材が位置ずれしにくい。また、上記絶縁管側部分は、絶縁管の外周面を取り囲む形状をしているため、絶縁管を保持しやすい。 Further, the holding member is an insulating member surrounding the outer peripheral surface of the insulating tube and a cylinder side portion that fixes the holding member to the cylindrical member by urging the inner peripheral surface of the cylindrical member radially outward. a tube-side portion is preferably provided with a connection portion connecting the said sleeve portion and said insulating tube portion (claim 3).
If it does in this way, since the said cylinder side part is urging | biasing the inner peripheral surface of a cylindrical member to radial direction outer side, a holding member can be firmly fixed with respect to a cylindrical member by this cylinder side part. Therefore, even if the temperature sensor vibrates, the holding member is not easily displaced. Moreover, since the said insulating-tube side part has the shape which surrounds the outer peripheral surface of an insulating tube, it is easy to hold | maintain an insulating tube.

また、上記保持部材は弾性体から構成されている。
したがって、保持部材の振動吸収効果を向上させることができる。そのため、細くて長い絶縁管を使用しても、振動によって絶縁管が破損する不具合を防止できる。 Further, the holding member that is composed of an elastic material.
Therefore , the vibration absorption effect of the holding member can be improved. Therefore, even if a thin and long insulating tube is used, a problem that the insulating tube is damaged by vibration can be prevented.

また、上記保持部材は、金属製の細線を絡み合わせた金属メッシュからなることが好ましい（請求項４）。
この場合には、温度センサの耐振性を高めることができる。すなわち、金属メッシュは金属材料の選択の幅を広げやすいため、耐熱性が高い金属材料を使って金属メッシュを形成することができる。そのため、この金属メッシュからなる保持部材を、より感温素子に近い位置、すなわち温度が高くなりやすい位置に設けることができる。これにより、絶縁管を保持する位置を調節し、温度センサの固有振動数を調整することが可能になる。そのため、例えば温度センサを車両に搭載して用いる場合、車両の振動数と温度センサの固有振動数をずらすことができ、車両の振動によって温度センサが共振する不具合を防止できる。そのため、温度センサの耐振性を向上できる。 Further, the holding member is preferably made of metal mesh intertwined metallic thin wire (claim 4).
In this case, the vibration resistance of the temperature sensor can be increased. That is, since the metal mesh can easily expand the selection range of the metal material, the metal mesh can be formed using a metal material having high heat resistance. Therefore, the holding member made of this metal mesh can be provided at a position closer to the temperature sensitive element, that is, at a position where the temperature tends to increase. This makes it possible to adjust the natural frequency of the temperature sensor by adjusting the position where the insulating tube is held. Therefore, for example, when a temperature sensor is mounted on a vehicle and used, the frequency of the vehicle and the natural frequency of the temperature sensor can be shifted, and a problem that the temperature sensor resonates due to the vibration of the vehicle can be prevented. Therefore, the vibration resistance of the temperature sensor can be improved.

また、上記筒状部材の内面と上記感温素子の外面との間に、空気よりも熱伝導率が高い高熱伝導材料が充填されていることが好ましい（請求項５）。
この場合には、被測定体の温度と感温素子との温度とが等しくなりやすい。そのため、被測定体の温度変化に対する、温度センサの応答性を向上させることができる。 Between the inner and outer surfaces of said temperature sensitive elements of the tubular member, it is preferable that high high thermal conductivity material thermal conductivity is filled than air (Claim 5).
In this case, the temperature of the measurement object and the temperature of the temperature sensitive element are likely to be equal. Therefore, the responsiveness of the temperature sensor with respect to the temperature change of the measurement object can be improved.

（実施例１）
本発明の実施例にかかる温度センサにつき、図１〜図５を用いて説明する。
本例の温度センサ１は、図１、図２に示すごとく、先端２１が閉じた筒状部材２と、該筒状部材２内に設けられた感温素子３と、絶縁管４と、一対の信号線５とを備える。絶縁管４は、筒状部材２の内部に設けられ、セラミック焼結体からなると共に、筒状部材２の軸線方向Ｘに貫通した一対の貫通孔４０を有する（図３参照）。絶縁管４は、例えばＡｌ２Ｏ３（アルミナ）、ＭｇＯ（マグネシア）、ＺｒＯ２（ジルコニア）、Ｓｉ３Ｎ４（窒化ケイ素）等の耐熱性をもったセラミックからなる。これらのセラミックの中では、絶縁抵抗が高いことや、加工性が良好なことから、Ａｌ２Ｏ３が好ましい。
なお、セラミック焼結体の密度を高くすれば、絶縁性や耐吸湿性を高めることができる。そのため、セラミック焼結体の密度は高ければ高いほど好ましい。
また、一対の信号線５は、感温素子３に接続しており、絶縁管４の貫通孔４０内を通っている。信号線５は、例えばＩＮＣＯＮＥＬ６０１、ＦｅＣｒＡｌ等の耐熱金属からなる。 Example 1
A temperature sensor according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the temperature sensor 1 of the present example includes a cylindrical member 2 having a closed tip 21, a temperature sensing element 3 provided in the cylindrical member 2, an insulating tube 4, and a pair. The signal line 5 is provided. The insulating tube 4 is provided inside the cylindrical member 2, is made of a ceramic sintered body, and has a pair of through holes 40 penetrating in the axial direction X of the cylindrical member 2 (see FIG. 3). The insulating tube 4 is made of a heat-resistant ceramic such as Al 2 O 3 (alumina), MgO (magnesia), ZrO 2 (zirconia), Si 3 N 4 (silicon nitride), for example. Among these ceramics, Al 2 O 3 is preferable because of its high insulation resistance and good workability.
In addition, if the density of a ceramic sintered compact is made high, insulation and moisture absorption resistance can be improved. Therefore, the higher the density of the ceramic sintered body, the better.
The pair of signal lines 5 are connected to the temperature sensitive element 3 and pass through the through hole 40 of the insulating tube 4. The signal line 5 is made of a heat-resistant metal such as INCONEL 601 or FeCrAl.

図１に示すごとく、絶縁管４の軸線方向Ｘにおける少なくとも一部の区間には、筒状部材２の内周面２０と絶縁管４の外周面４５との間に隙間１０が形成されている。
また、筒状部材２との間に隙間１０を設けた状態で絶縁管４を保持する保持部材６が、筒状部材２に取り付けられている。
以下、詳説する。 As shown in FIG. 1, a gap 10 is formed between the inner peripheral surface 20 of the tubular member 2 and the outer peripheral surface 45 of the insulating tube 4 in at least a part of the section in the axial direction X of the insulating tube 4. .
A holding member 6 that holds the insulating tube 4 in a state where a gap 10 is provided between the cylindrical member 2 and the cylindrical member 2 is attached to the cylindrical member 2.
The details will be described below.

本例の温度センサ１は、車両の排気管７に取り付けられており、排気管７内を流れる排気ガスｇ（本例の被測定体）の温度を測定している。
また、本例の筒状部材２は、感温素子３を収納する第１部分２ａと、該第１部分２ａにその先端部を内嵌した第２部分２ｂとからなる。図２に示すごとく、第１部分２ａと第２部分２ｂとは、溶接部２５０にレーザー溶接等を行うことにより溶接されている。第２部分２ｂの内側には、軸線方向Ｘにおける全ての区間に、隙間１０が形成されている。また、第１部分２ａは、第２部分２ｂの先端面２３よりも先端側が縮径しており、この縮径した箇所（縮径部）に、絶縁管４が挿入されている。縮径部に絶縁管４を挿入できるようにするため、縮径部の内径は、絶縁管４の外径よりも僅かに大きくなっている。そのため、縮径部と絶縁管４との間には、０．５ｍｍ〜１．０ｍｍ程度の隙間がある。 The temperature sensor 1 of this example is attached to the exhaust pipe 7 of the vehicle, and measures the temperature of the exhaust gas g (measured body of this example) flowing through the exhaust pipe 7.
Moreover, the cylindrical member 2 of the present example includes a first portion 2a that houses the temperature sensing element 3, and a second portion 2b in which the tip portion is fitted into the first portion 2a. As shown in FIG. 2, the first portion 2 a and the second portion 2 b are welded to the welded portion 250 by performing laser welding or the like. On the inner side of the second portion 2b, gaps 10 are formed in all sections in the axial direction X. The first portion 2a has a diameter smaller than the distal end surface 23 of the second portion 2b, and the insulating tube 4 is inserted into the reduced diameter portion (diameter reduced portion). In order to allow the insulating tube 4 to be inserted into the reduced diameter portion, the inner diameter of the reduced diameter portion is slightly larger than the outer diameter of the insulating tube 4. Therefore, there is a gap of about 0.5 mm to 1.0 mm between the reduced diameter portion and the insulating tube 4.

感温素子３は、サーミスタからなる。感温素子３は、絶縁管４の先端部４１と、筒状部材２の先端２１との間に配置されている。また、筒状部材２の先端２１と感温素子３との間には、熱伝導性が高い緩衝材１１が充填されている。   The temperature sensitive element 3 is a thermistor. The temperature sensing element 3 is disposed between the distal end portion 41 of the insulating tube 4 and the distal end 21 of the cylindrical member 2. In addition, between the tip 21 of the cylindrical member 2 and the temperature sensing element 3, a buffer material 11 having high thermal conductivity is filled.

一方、図１に示すごとく、筒状部材２には、径方向外側へ突出するリブ部１２が形成されている。このリブ部１２の後端側部分１２ａに、外筒８が外嵌している。また、外筒８には、雄螺子部１３０を備えた締結部材１３が外嵌している。
また、排気管７には、螺子孔７０が貫通形成されている。螺子孔７０は、内側部分７２が縮径している。温度センサ１を排気管７に取り付ける際には、排気管７の外側から温度センサ１を挿入し、締結部材１３を螺子孔７０に螺合する。このようにすると、上記内側部分７２の座面７１にリブ部１２が密着する。これにより、排気ガスｇが外部に漏れることを防止している。 On the other hand, as shown in FIG. 1, the tubular member 2 is formed with a rib portion 12 protruding outward in the radial direction. The outer cylinder 8 is fitted on the rear end portion 12 a of the rib portion 12. Further, the outer member 8 is fitted with a fastening member 13 having a male screw portion 130.
Further, a screw hole 70 is formed through the exhaust pipe 7. The inner diameter of the screw hole 70 is reduced. When attaching the temperature sensor 1 to the exhaust pipe 7, the temperature sensor 1 is inserted from the outside of the exhaust pipe 7 and the fastening member 13 is screwed into the screw hole 70. If it does in this way, the rib part 12 will closely_contact | adhere to the seat surface 71 of the said inner side part 72. FIG. Thereby, the exhaust gas g is prevented from leaking outside.

また、外筒８の後端部８０には、ゴム製のブッシュ１４が取り付けられている。ブッシュ１４にはリード線１５が通っている。このリード線１５は、信号線５と接続している。また、外筒８の後端部８０は、加締め加工がされている。これにより、ブッシュ１４と、リード線１５の抜け止めをしている。   A rubber bush 14 is attached to the rear end 80 of the outer cylinder 8. A lead wire 15 passes through the bush 14. The lead wire 15 is connected to the signal line 5. Further, the rear end portion 80 of the outer cylinder 8 is swaged. As a result, the bush 14 and the lead wire 15 are prevented from coming off.

保持部材６は、図１に示すごとく、リブ部１２よりも軸線方向Ｘにおける後端側に取り付けられている。保持部材６は、弾性体から構成されている。
また、図４、図５に示すごとく、保持部材６は、筒側部分６ａと、絶縁管部分６ｂと、接続部６ｃとを備える。筒側部分６ａは、筒状部材２の内周面２０を径方向外側へ付勢することにより、保持部材６を筒状部材２に固定している。絶縁管部分６ｂは、絶縁管４の外周面４５を取り囲んでいる。接続部６ｃは、筒側部分６ａと絶縁管側部分６ｂとを繋いでいる。 As shown in FIG. 1, the holding member 6 is attached to the rear end side in the axial direction X with respect to the rib portion 12. The holding member 6 is made of an elastic body.
As shown in FIGS. 4 and 5, the holding member 6 includes a tube side portion 6 a, an insulating tube portion 6 b, and a connection portion 6 c. The cylinder side portion 6 a fixes the holding member 6 to the cylindrical member 2 by urging the inner peripheral surface 20 of the cylindrical member 2 radially outward. The insulating tube portion 6 b surrounds the outer peripheral surface 45 of the insulating tube 4. The connecting portion 6c connects the tube side portion 6a and the insulating tube side portion 6b.

また、筒側部分６ａの後端部には、径方向外側へ突出した係止爪６ｄが形成されている。温度センサ１を製造する際に、保持部材６を筒状部材２内に挿入すると、筒状部材２の後端面２２に係止爪６ｄが引っ掛かり、それ以上、保持部材６が先端側へ移動しなくなる。これにより、保持部材６の位置決めができるようになっている。   Moreover, the latching claw 6d which protrudes to the radial direction outer side is formed in the rear-end part of the cylinder side part 6a. When the temperature sensor 1 is manufactured, if the holding member 6 is inserted into the cylindrical member 2, the locking claw 6 d is caught on the rear end surface 22 of the cylindrical member 2, and the holding member 6 moves further to the front end side. Disappear. Thereby, the holding member 6 can be positioned.

本例の作用効果について説明する。図１、図２に示すごとく、本例では、粉末状のセラミックを使用するのではなく、セラミック焼結体からなる絶縁管４を用いた。そして、この絶縁管４に設けた貫通孔４０に、信号線５を挿通させた。
絶縁管４はセラミック焼結体からなるため、上記構造にすると、絶縁管４が吸湿しにくくなり、一対の信号線５の間の絶縁性が低下しにくくなる。
また、本例では、従来のようにしごき加工を行う必要が無いため、温度センサ１の製造コストを低減できる。 The effect of this example will be described. As shown in FIGS. 1 and 2, in this example, an insulating tube 4 made of a ceramic sintered body was used instead of using a powdered ceramic. Then, the signal line 5 was inserted into the through hole 40 provided in the insulating tube 4.
Since the insulating tube 4 is made of a ceramic sintered body, with the above structure, the insulating tube 4 is less likely to absorb moisture, and the insulation between the pair of signal wires 5 is less likely to decrease.
Further, in this example, since there is no need to perform ironing as in the prior art, the manufacturing cost of the temperature sensor 1 can be reduced.

また、本例では、絶縁管４の軸線方向Ｘにおける少なくとも一部の区間において、筒状部材２の内周面２０と絶縁管４の外周面４５との間に隙間１０を設けた。
このようにすると、筒状部材２と絶縁管４との間に隙間１０が形成されているため、絶縁管４から筒状部材２へ熱伝導しにくくなる。そのため、感温素子３の熱が絶縁管４を通って筒状部材２へ伝わり、さらに筒状部材２の周囲に放熱されるという不具合を防止できる。その結果、感温素子３の温度と被測定体（排気ガスｇ）の温度とが等しくなりやすくなり、被測定体の温度が変化した場合に、変化後の温度を素早く検出することが可能になる。すなわち、被測定体の温度変化に対する応答性が良好になる。 In this example, the gap 10 is provided between the inner peripheral surface 20 of the tubular member 2 and the outer peripheral surface 45 of the insulating tube 4 in at least a part of the section in the axial direction X of the insulating tube 4.
If it does in this way, since the clearance gap 10 is formed between the cylindrical member 2 and the insulating tube 4, it will become difficult to conduct heat from the insulating tube 4 to the cylindrical member 2. Therefore, it is possible to prevent a problem that the heat of the temperature sensing element 3 is transmitted to the cylindrical member 2 through the insulating tube 4 and further radiated around the cylindrical member 2. As a result, the temperature of the temperature sensing element 3 and the temperature of the measurement object (exhaust gas g) are likely to be equal, and when the temperature of the measurement object changes, the temperature after the change can be detected quickly. Become. That is, the response to the temperature change of the measured object is improved.

また、絶縁管４から筒状部材２へ熱伝導しにくいと、ブッシュ１４やリード線１５等の温度が高くなりにくい。そのため、耐熱性が高いブッシュ１４等を使用する必要がなくなり、温度センサ１の製造コストを低くすることが可能になる。   Further, if it is difficult to conduct heat from the insulating tube 4 to the cylindrical member 2, the temperature of the bush 14, the lead wire 15 and the like is difficult to increase. Therefore, it is not necessary to use the bush 14 having high heat resistance and the manufacturing cost of the temperature sensor 1 can be reduced.

また、本例の温度センサ１は、絶縁管４を保持する保持部材６を有する。そのため、温度センサ１に外部から何らかの力が加わり、振動した場合でも、絶縁管４を筒状部材２に対して保持することができる。そのため、絶縁管４が径方向に揺れにくくなり、細くて長い絶縁管４を用いた場合でも、絶縁管４が破損しにくくなる。   Further, the temperature sensor 1 of this example includes a holding member 6 that holds the insulating tube 4. Therefore, even when some force is applied to the temperature sensor 1 from the outside and vibrates, the insulating tube 4 can be held against the cylindrical member 2. Therefore, the insulating tube 4 is less likely to shake in the radial direction, and the insulating tube 4 is less likely to be damaged even when the thin and long insulating tube 4 is used.

図１、図２に示すごとく、本例では、筒状部材２のうち感温素子３を配置した部分は、隙間１０を設けた部分よりも縮径している。
このようにすると、感温素子３と筒状部材２との間の隙間を小さくすることができるため、被測定体の温度と感温素子３の温度とが等しくなりやすい。そのため、被測定体の温度変化に対する応答性が一層、良好になる。 As shown in FIGS. 1 and 2, in this example, the portion of the tubular member 2 where the temperature sensitive element 3 is disposed is smaller in diameter than the portion where the gap 10 is provided.
In this way, since the gap between the temperature sensing element 3 and the cylindrical member 2 can be reduced, the temperature of the measured object and the temperature of the temperature sensing element 3 tend to be equal. Therefore, the responsiveness to the temperature change of the measured object is further improved.

また、図４、図５に示すごとく、保持部材６は、筒状部材２の内周面２０を径方向外側へ付勢することにより保持部材６を筒状部材２に固定する筒側部分６ａと、絶縁管４の外周面４５を取り囲む絶縁管側部分６ｂと、筒側部分６ａと絶縁管側部分６ｂとを繋ぐ接続部６ｃとを備える。
このようにすると、筒側部分６ａが筒状部材２の内周面２０を径方向外側へ付勢しているため、この筒側部分６ａによって、保持部材６を筒状部材２に対してしっかりと固定できる。そのため、温度センサ１が振動しても、保持部材６が位置ずれしにくい。また、絶縁管側部分６ｂは、絶縁管４の外周面４５を取り囲む形状をしているため、絶縁管４を保持しやすい。 As shown in FIGS. 4 and 5, the holding member 6 is a cylinder side portion 6 a that fixes the holding member 6 to the cylindrical member 2 by urging the inner peripheral surface 20 of the cylindrical member 2 radially outward. And an insulating tube side portion 6b that surrounds the outer peripheral surface 45 of the insulating tube 4, and a connecting portion 6c that connects the tube side portion 6a and the insulating tube side portion 6b.
In this case, since the cylindrical side portion 6a urges the inner peripheral surface 20 of the cylindrical member 2 radially outward, the cylindrical side portion 6a firmly holds the holding member 6 against the cylindrical member 2. Can be fixed. Therefore, even if the temperature sensor 1 vibrates, the holding member 6 is not easily displaced. Further, since the insulating tube side portion 6b has a shape surrounding the outer peripheral surface 45 of the insulating tube 4, it is easy to hold the insulating tube 4.

また、本例では、図１に示すごとく、保持部材６は、リブ部１２よりも軸線方向Ｘにおける後端側に設けられている。
リブ部１２は、排気ガスｇに接触するため、温度が比較的上昇しやすい。これに対し、リブ部１２よりも後端側の部分は、排気ガスｇが接触しないため、温度が上昇しにくい。そのため、リブ部１２よりも後端側に保持部材６を設ければ、耐熱性が低い保持部材６を使用することが可能になる。そのため、温度センサ１の製造コストを低減できる。 In this example, as shown in FIG. 1, the holding member 6 is provided on the rear end side in the axial direction X with respect to the rib portion 12.
Since the rib part 12 contacts the exhaust gas g, the temperature is relatively likely to rise. On the other hand, since the exhaust gas g does not contact the portion on the rear end side with respect to the rib portion 12, the temperature hardly rises. Therefore, if the holding member 6 is provided on the rear end side with respect to the rib portion 12, the holding member 6 having low heat resistance can be used. Therefore, the manufacturing cost of the temperature sensor 1 can be reduced.

また、本例では、保持部材６は弾性体から構成されている。そのため、保持部材６の振動吸収効果が高い。したがって、細くて長い絶縁管４を使用しても、振動によって絶縁管４が破損する不具合を防止できる。   Moreover, in this example, the holding member 6 is comprised from the elastic body. Therefore, the vibration absorption effect of the holding member 6 is high. Therefore, even if the thin and long insulating tube 4 is used, a problem that the insulating tube 4 is damaged by vibration can be prevented.

以上のごとく、本例によれば、製造コストを低減でき、信号線の絶縁性を確保しやすく、かつ被測定体の温度変化に対する応答性が良好な温度センサを提供することができる。   As described above, according to this example, it is possible to provide a temperature sensor that can reduce the manufacturing cost, can easily ensure the insulation of the signal line, and has good responsiveness to the temperature change of the measurement object.

（実施例２）
本例は、保持部材６を変更した例である。図６に示すごとく、本例の保持部材６は、金属製の細線を絡み合わせた金属メッシュからなる。
このようにすると、温度センサ１の耐振性を高めることができる。すなわち、金属メッシュは金属材料の選択の幅を広げやすいため、耐熱性が高い金属材料を使って金属メッシュを形成することができる。そのため、この金属メッシュからなる保持部材６を、より感温素子３に近い位置、すなわち温度が高くなりやすい位置に設けることができる。これにより、絶縁管４を保持する位置を調節し、温度センサ１の固有振動数を調整することが可能になる。そのため、例えば温度センサ１を車両に搭載して用いる場合、車両の振動数と温度センサ１の固有振動数をずらすことができ、車両の振動によって温度センサ１が共振する不具合を防止できる。そのため、温度センサ１の耐振性を向上できる。
なお、金属メッシュは、耐熱性の高い金属材料、例えばＩＮＣＯ６０１等を用いて形成することができる。
その他、実施例１と同様の構成および作用効果を有する。 (Example 2)
In this example, the holding member 6 is changed. As shown in FIG. 6, the holding member 6 of this example is made of a metal mesh in which metal thin wires are entangled.
In this way, the vibration resistance of the temperature sensor 1 can be improved. That is, since the metal mesh can easily expand the selection range of the metal material, the metal mesh can be formed using a metal material having high heat resistance. Therefore, the holding member 6 made of this metal mesh can be provided at a position closer to the temperature sensitive element 3, that is, a position where the temperature tends to increase. Thereby, the position where the insulating tube 4 is held can be adjusted, and the natural frequency of the temperature sensor 1 can be adjusted. For this reason, for example, when the temperature sensor 1 is mounted on a vehicle and used, the frequency of the vehicle and the natural frequency of the temperature sensor 1 can be shifted, and a problem that the temperature sensor 1 resonates due to the vibration of the vehicle can be prevented. Therefore, the vibration resistance of the temperature sensor 1 can be improved.
Note that the metal mesh can be formed using a metal material having high heat resistance, such as INCO601.
In addition, the configuration and operational effects are the same as those of the first embodiment.

（実施例３）
本例は、図７に示すごとく、筒状部材２の第１部分２ａの内面と、感温素子３の外面との間に、空気よりも熱伝導率が高い高熱伝導材料１９を充填した例である。高熱伝導材料１９としては、例えばアルミナ（Ａｌ２Ｏ３）を用いることができる。また、本例では、第１部分２ａの縮径した部分と絶縁管４との間に、例えば０．５〜１．０ｍｍ程度の隙間（図示しない）が形成されており、この隙間にも高熱伝導材料１９が充填されている。 (Example 3)
In this example, as shown in FIG. 7, a high thermal conductive material 19 having a higher thermal conductivity than air is filled between the inner surface of the first portion 2 a of the cylindrical member 2 and the outer surface of the temperature sensitive element 3. It is. As the high thermal conductive material 19, for example, alumina (Al 2 O 3 ) can be used. Further, in this example, a gap (not shown) of, for example, about 0.5 to 1.0 mm is formed between the reduced diameter portion of the first portion 2a and the insulating tube 4, and high heat is also generated in this gap. The conductive material 19 is filled.

また、図７の例では、第１部分２ａの縮径した部分、すなわち矢印Ａに示す位置まで高熱伝導材料１９を充填したが、図８に示すごとく、筒状部材２の第２部分２ｂまで高熱伝導材料１９を充填してもよい。
その他、実施例１と同様の構成を備える。 Further, in the example of FIG. 7, the high heat conductive material 19 is filled up to the reduced diameter portion of the first portion 2 a, that is, the position shown by the arrow A, but as shown in FIG. High heat conductive material 19 may be filled.
In addition, the same configuration as that of the first embodiment is provided.

本例の作用効果について説明する。本例では、筒状部材２の第１部分２ａと感温素子３との間に高熱伝導材料１９が充填されているため、被測定体の温度と感温素子３との温度とが等しくなりやすい。そのため、被測定体の温度変化に対する、温度センサ１の応答性を向上させることができる。
その他、実施例１と同様の作用効果を有する。 The effect of this example will be described. In this example, since the high thermal conductive material 19 is filled between the first portion 2a of the tubular member 2 and the temperature sensing element 3, the temperature of the measured object and the temperature of the temperature sensing element 3 are equal. Cheap. Therefore, the responsiveness of the temperature sensor 1 with respect to the temperature change of a to-be-measured body can be improved.
In addition, the same effects as those of the first embodiment are obtained.

（実施例４）
本例は図９に示すごとく、筒状部材２における、内側に感温素子３を配置した部分（第１部分２ａ）と、絶縁管４の外周面との間に隙間１０を設けた部分（第２部分２ｂ）とを一体に形成した例である。
すなわち本例では、実施例１のように、第１部分２ａと第２部分２ｂとの２個の部材を用意し、これらの部材を溶接して筒状部材２を形成するのではなく（図２参照）、第１部分２ａと第２部分２ｂとが一体となった１部品として、筒状部材２を構成した。このような筒状部材２は、例えば深絞り加工によって製造することができる。
その他、実施例１と同様の構成を備える。 Example 4
In this example, as shown in FIG. 9, a portion of the tubular member 2 in which a gap 10 is provided between a portion (first portion 2 a) where the temperature-sensitive element 3 is disposed on the inner side and the outer peripheral surface of the insulating tube 4 ( This is an example in which the second part 2b) is integrally formed.
That is, in this example, unlike the first embodiment, two members of the first portion 2a and the second portion 2b are prepared, and these members are welded to form the cylindrical member 2 (see FIG. 2), the cylindrical member 2 was configured as one component in which the first portion 2a and the second portion 2b were integrated. Such a cylindrical member 2 can be manufactured by deep drawing, for example.
In addition, the same configuration as that of the first embodiment is provided.

本例の作用効果について説明する。上記構成にすると、筒状部材２に腐食等が生じにくくなる。すなわち、第１部分２ａと第２部分２ｂ（図２参照）とをそれぞれ別部材として形成し、溶接等を行って接続することもできるが、この場合には、溶接によって鋭敏化が起きるため（例えば、結晶粒界にＣｒ２３Ｃ６が生成されて粒界のＣｒ濃度が下がる）、溶接部２５０が腐食しやすくなることがある。また、溶接時に、溶接部２５０に熱応力が加わりやすいという問題もある。しかしながら、深絞り加工等を行うことにより、第１部分２ａと第２部分２ｂとを一体形成すれば、溶接工程を行う必要がなくなり、溶接部が腐食する等の不具合が生じにくくなる。
その他、実施例１と同様の作用効果を有する。 The effect of this example will be described. If it is the said structure, it will become difficult to produce corrosion etc. in the cylindrical member 2. FIG. That is, the first portion 2a and the second portion 2b (see FIG. 2) can be formed as separate members and connected by welding or the like, but in this case, since sensitization occurs by welding ( For example, Cr 23 C 6 is generated at the crystal grain boundary and the Cr concentration at the grain boundary is lowered), and the welded portion 250 may be easily corroded. In addition, there is a problem that thermal stress is easily applied to the welded part 250 during welding. However, if the first portion 2a and the second portion 2b are integrally formed by performing deep drawing or the like, it is not necessary to perform a welding process, and problems such as corrosion of the welded portion are less likely to occur.
In addition, the same effects as those of the first embodiment are obtained.

１ 温度センサ
１０ 隙間
２ 筒状部材
３ 感温素子
４ 絶縁管
５ 信号線
６ 保持部材 DESCRIPTION OF SYMBOLS 1 Temperature sensor 10 Crevice 2 Cylindrical member 3 Temperature sensing element 4 Insulating tube 5 Signal line 6 Holding member

Claims (5)

先端が閉じた筒状部材と、
該筒状部材の内部における上記先端に設けられた感温素子と、
上記筒状部材の内部に設けられ、セラミック焼結体からなると共に、上記筒状部材の軸線方向に貫通した一対の貫通孔を有する絶縁管と、
上記感温素子に接続し、上記絶縁管の上記貫通孔内を通る一対の信号線と、
上記筒状部材を外周側から保持するリブ部とを備え、
上記筒状部材の先端側には、上記絶縁管の先端部および上記感温素子を保持する縮径部が形成され、上記筒状部材のうち上記縮径部よりも後端側は該縮径部よりも拡径しており、
その拡径した部分には、上記筒状部材の内周面と上記絶縁管の外周面との間に隙間が形成され、
上記軸線方向において、上記隙間の長さは上記縮径部の長さよりも長く、
上記筒状部材との間に上記隙間を設けた状態で上記絶縁管を保持する保持部材が、上記筒状部材に取り付けられており、
上記保持部材は弾性体からなり、
上記保持部材は、上記リブ部よりも上記軸線方向における後端側に取り付けられていることを特徴とする温度センサ。 A cylindrical member with a closed tip;
A temperature sensing element provided at the tip in the cylindrical member;
An insulating tube provided inside the cylindrical member, made of a ceramic sintered body, and having a pair of through holes penetrating in the axial direction of the cylindrical member;
A pair of signal lines connected to the temperature sensitive element and passing through the through hole of the insulating tube ;
A rib portion for holding the cylindrical member from the outer peripheral side ,
On the distal end side of the tubular member, a distal end portion of the insulating tube and a reduced diameter portion for holding the temperature sensing element are formed, and the rear end side of the tubular member from the reduced diameter portion is the reduced diameter portion. The diameter is larger than the part,
In the expanded diameter portion , a gap is formed between the inner peripheral surface of the cylindrical member and the outer peripheral surface of the insulating tube,
In the axial direction, the length of the gap is longer than the length of the reduced diameter portion,
A holding member that holds the insulating tube in a state where the gap is provided between the cylindrical member and the cylindrical member is attached to the cylindrical member,
The holding member is made of an elastic body,
The temperature sensor , wherein the holding member is attached to a rear end side in the axial direction with respect to the rib portion . 請求項１において、上記筒状部材は、内側に上記感温素子を配置した部分と、上記絶縁管の外周面との間に上記隙間を設けた部分とが一体に形成されていることを特徴とする温度センサ。 2. The cylindrical member according to claim 1, wherein a portion where the temperature sensing element is disposed on the inside and a portion where the gap is provided between the outer peripheral surface of the insulating tube are integrally formed. Temperature sensor. 請求項１または請求項２において、上記保持部材は、上記筒状部材の内周面を径方向外側へ付勢することにより上記保持部材を上記筒状部材に固定する筒側部分と、上記絶縁管の外周面を取り囲む絶縁管側部分と、上記筒側部分と上記絶縁管側部分とを繋ぐ接続部とを備えることを特徴とする温度センサ。 3. The holding member according to claim 1, wherein the holding member includes a cylinder side portion that fixes the holding member to the cylindrical member by urging the inner peripheral surface of the cylindrical member radially outward, and the insulating member. A temperature sensor comprising: an insulating tube side portion surrounding an outer peripheral surface of a tube; and a connecting portion connecting the tube side portion and the insulating tube side portion. 請求項１または請求項２において、上記保持部材は、金属製の細線を絡み合わせた金属メッシュからなることを特徴とする温度センサ。 3. The temperature sensor according to claim 1, wherein the holding member is made of a metal mesh in which metal thin wires are entangled. 請求項１〜請求項４のいずれか１項において、上記筒状部材の内面と上記感温素子の外面との間に、空気よりも熱伝導率が高い高熱伝導材料が充填されていることを特徴とする温度センサ。 In any one of Claims 1-4 , it is filled with the high heat conductive material whose heat conductivity is higher than air between the inner surface of the said cylindrical member, and the outer surface of the said thermosensitive element. A characteristic temperature sensor.
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