JP6589498B2

JP6589498B2 - Temperature sensor

Info

Publication number: JP6589498B2
Application number: JP2015184664A
Authority: JP
Inventors: 山本　憲治; 憲治山本
Original assignee: Mitsubishi Materials Corp
Current assignee: Mitsubishi Materials Corp
Priority date: 2015-09-18
Filing date: 2015-09-18
Publication date: 2019-10-16
Anticipated expiration: 2035-09-18
Also published as: JP2017058297A

Description

本発明は、金属製の筒状部材に成形樹脂部を封入した温度センサに関する。 The present invention relates to a temperature sensor in which a molded resin portion is enclosed in a metallic cylindrical member.

従来、温度センサとして、金属ケース内にサーミスタチップと共に樹脂を一体成形したものが知られている。例えば、特許文献１には、先端にネジ部が形成された金属ケース（キャップ）に、感熱素子を挿入すると共に、エポキシ樹脂、無機接着剤等の液状充填材を注入し硬化した温度センサが記載されている。 Conventionally, a temperature sensor in which a resin is integrally formed with a thermistor chip in a metal case is known. For example, Patent Document 1 describes a temperature sensor in which a thermal element is inserted into a metal case (cap) having a threaded portion at the tip and a liquid filler such as an epoxy resin or an inorganic adhesive is injected and cured. Has been.

実公昭５８−２８１９４号公報Japanese Utility Model Publication No. 58-28194

上記従来の技術には、以下の課題が残されている。
すなわち、金属ケースのネジ部等によって被検知体に取り付けられた温度センサでは、被検知体との接触部分から伝熱した熱が充填材であるエポキシ樹脂、無機接着剤等を介して感熱素子に伝わるため、熱応答性が悪くなってしまう不都合があった。また、充填材を硬化するまでに感熱素子が浮く等して位置ずれが生じ易く、熱応答性にばらつきが生じ易かった。さらに、小型の感熱素子を適用し、熱応答性を向上させようとした場合、金属ケースとのクリアランスが広くなり、充填材の量が増えるため、熱応答性の高速化に限界があった。 The following problems remain in the conventional technology.
That is, in the temperature sensor attached to the detected object by the screw part of the metal case, the heat transferred from the contact portion with the detected object is transferred to the heat sensitive element via the epoxy resin, inorganic adhesive, etc. as a filler. Therefore, there is a disadvantage that the thermal response is deteriorated. In addition, the thermal element floats before the filler is cured, and the positional deviation is likely to occur, and the thermal responsiveness is likely to vary. Furthermore, when trying to improve the thermal response by applying a small thermal element, the clearance with the metal case is widened and the amount of filler is increased, so that there is a limit to speeding up the thermal response.

本発明は、前述の課題に鑑みてなされたもので、熱応答性を向上可能であると共に感熱素子の位置ずれを防止することができる温度センサを提供することを目的とする。 The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a temperature sensor that can improve the thermal responsiveness and can prevent the displacement of the thermal element.

本発明は、前記課題を解決するために以下の構成を採用した。すなわち、第１の発明に係る温度センサは、金属製の筒状部材と、前記筒状部材内に挿入された樹脂製のインナーキャップと、前記インナーキャップ内に充填された樹脂で形成された成形樹脂部と、前記成形樹脂部内に封入された感熱素子と、前記筒状部材と前記インナーキャップとの間であって前記感熱素子の周囲に配され、外側が前記筒状部材の内周面に当接すると共に内側が前記インナーキャップの外周面に当接した金属製のスリーブ部材とを備えていることを特徴とする。 The present invention employs the following configuration in order to solve the above problems. That is, the temperature sensor according to the first aspect of the present invention is a molding formed of a metal cylindrical member, a resin inner cap inserted into the cylindrical member, and a resin filled in the inner cap. A resin part, a heat sensitive element enclosed in the molded resin part, and arranged between the tubular member and the inner cap and around the heat sensitive element, and an outer side is an inner peripheral surface of the tubular member And a metal sleeve member that is in contact with and is in contact with the outer peripheral surface of the inner cap.

この温度センサでは、筒状部材とインナーキャップとの間であって感熱素子の周囲に配され、外側が筒状部材の内周面に当接すると共に内側がインナーキャップの外周面に当接した金属製のスリーブ部材を備えているので、スリーブ部材を介して筒状部材とインナーキャップとを熱的に結合させると共に全周から熱を伝えることで受熱面積を大きくでき、高い熱応答性を得ることができる。また、インナーキャップによって成形樹脂部及び感熱素子が位置決めされると共に成形樹脂部の径を小さく設定でき、熱応答性のばらつきを低減することができる。また、これにより、被検知体の温度に対して検知温度差も小さくすることができる。さらに、小型の感熱素子を適用した場合、筒状部材とインナーキャップとの間にスリーブ部材が設置されることで、インナーキャップの外径を細くすることができ、成形樹脂部の樹脂の充填量を増やさないことで熱応答性を速くすることができる。なお、インナーキャップ内に射出成形によって成形樹脂部を充填する場合、充填される樹脂の圧力でインナーキャップが膨張し、ひび割れすることを、スリーブ部材がインナーキャップの外側を支持することで防止することができる。 In this temperature sensor, the metal is disposed between the tubular member and the inner cap and around the thermal element, and the outer side is in contact with the inner peripheral surface of the cylindrical member and the inner side is in contact with the outer peripheral surface of the inner cap. Since the sleeve member is made, the tubular member and the inner cap are thermally coupled via the sleeve member, and the heat receiving area can be increased by transferring heat from the entire circumference, thereby obtaining high thermal responsiveness. Can do. Further, the molded resin portion and the thermosensitive element are positioned by the inner cap, and the diameter of the molded resin portion can be set small, so that variations in thermal response can be reduced. This also makes it possible to reduce the detected temperature difference with respect to the temperature of the object to be detected. Furthermore, when a small thermal element is applied, the outer diameter of the inner cap can be reduced by installing a sleeve member between the cylindrical member and the inner cap, and the resin filling amount of the molded resin portion By not increasing the thermal response, the thermal response can be increased. When filling the molded resin part into the inner cap by injection molding, the sleeve member prevents the inner cap from expanding and cracking due to the pressure of the filled resin by supporting the outside of the inner cap. Can do.

第２の発明に係る温度センサは、第１の発明において、前記筒状部材の外周に雄ねじ部が形成されており、前記感熱素子が、前記雄ねじ部の内側に配置されていることを特徴とする。
すなわち、この温度センサでは、感熱素子が、雄ねじ部の内側に配置されているので、雄ねじ部を被検知体の雌ねじ部に螺着させた際に、螺接面の内側に感熱素子を位置決めできる。また、雄ねじ部によって温度センサの被検知体への取り付けが容易になると共にレイアウトの自由度も高くなる。 A temperature sensor according to a second invention is characterized in that, in the first invention, a male screw part is formed on an outer periphery of the cylindrical member, and the thermal element is arranged inside the male screw part. To do.
That is, in this temperature sensor, since the thermal element is arranged inside the male screw part, when the male screw part is screwed to the female screw part of the detected body, the thermal element can be positioned inside the screw contact surface. . In addition, the male screw part facilitates the attachment of the temperature sensor to the detection target and increases the degree of freedom in layout.

第３の発明に係る温度センサは、第１又は第２の発明において、前記インナーキャップが、前記スリーブ部材の基端を係止可能な段部を有していることを特徴とする。
すなわち、この温度センサでは、インナーキャップが、スリーブ部材の基端を係止可能な段部を有しているので、段部にスリーブ部材が係止されることでスリーブ部材を軸方向に位置決めすることができる。 A temperature sensor according to a third aspect of the present invention is characterized in that, in the first or second aspect, the inner cap has a step portion that can lock the proximal end of the sleeve member.
That is, in this temperature sensor, since the inner cap has a step portion that can lock the proximal end of the sleeve member, the sleeve member is locked to the step portion to position the sleeve member in the axial direction. be able to.

第４の発明に係る温度センサは、第１から第３の発明のいずれかにおいて、前記スリーブ部材が、断面円形状であることを特徴とする。
すなわち、この温度センサでは、スリーブ部材が、断面円形状であるので、筒状部材からの熱を周方向で均一にインナーキャップに伝えることができる。 A temperature sensor according to a fourth invention is characterized in that, in any one of the first to third inventions, the sleeve member has a circular cross section.
That is, in this temperature sensor, since the sleeve member has a circular cross section, the heat from the cylindrical member can be uniformly transmitted to the inner cap in the circumferential direction.

第５の発明に係る温度センサは、第１から第３の発明のいずれかにおいて、前記スリーブ部材が、半径方向に弾性を有する弾性部を有していることを特徴とする。
すなわち、この温度センサでは、スリーブ部材が、半径方向に弾性を有する弾性部を有しているので、弾性部の弾性によって外部からの振動や衝撃を緩和してインナーキャップ内の感熱素子を保護することができる。 A temperature sensor according to a fifth invention is characterized in that, in any one of the first to third inventions, the sleeve member has an elastic part having elasticity in a radial direction.
That is, in this temperature sensor, since the sleeve member has an elastic part having elasticity in the radial direction, the elasticity of the elastic part alleviates external vibrations and shocks and protects the thermal element in the inner cap. be able to.

第６の発明に係る温度センサは、第１から第３の発明のいずれかにおいて、前記スリーブ部材が、前記筒状部材に当接する外周面部と、前記インナーキャップに当接する内周面部とを備え、前記外周面部と前記内周面部との間に中空部を有していることを特徴とする。
すなわち、この温度センサでは、外周面部と内周面部との間に中空部を有しているので、中空部によってスリーブ部材の熱容量が小さくなるため、熱応答性を速くすることができる。特に、インナーキャップの外径を細くした場合、筒状部材とインナーキャップとの間のクリアランスが広くなるが、中空部を有するスリーブ部材を用いることで、熱容量の増大を抑制してインナーキャップを筒状部材内に固定することができる。 A temperature sensor according to a sixth aspect of the present invention is the temperature sensor according to any one of the first to third aspects, wherein the sleeve member includes an outer peripheral surface portion that contacts the tubular member and an inner peripheral surface portion that contacts the inner cap. A hollow portion is provided between the outer peripheral surface portion and the inner peripheral surface portion.
That is, in this temperature sensor, since the hollow portion is provided between the outer peripheral surface portion and the inner peripheral surface portion, the heat capacity of the sleeve member is reduced by the hollow portion, so that the thermal responsiveness can be increased. In particular, when the outer diameter of the inner cap is reduced, the clearance between the cylindrical member and the inner cap becomes wider. However, by using a sleeve member having a hollow portion, the increase in heat capacity is suppressed and the inner cap is It can be fixed in the shaped member.

本発明によれば、以下の効果を奏する。
すなわち、本発明に係る温度センサによれば、筒状部材とインナーキャップとの間であって感熱素子の周囲に配され、外側が筒状部材の内周面に当接すると共に内側がインナーキャップの外周面に当接した金属製のスリーブ部材とを備えているので、高い熱応答性を得ることができると共に、応答性のばらつきを低減することができる。
したがって、本発明を、高い応答性を有すると共に精度の高い温度測定が可能であり、例えばエンジンの温度を検知する手段として好適である。 The present invention has the following effects.
That is, according to the temperature sensor of the present invention, it is disposed between the tubular member and the inner cap and around the thermal element, the outer side is in contact with the inner peripheral surface of the cylindrical member, and the inner side is the inner cap. Since the metal sleeve member that is in contact with the outer peripheral surface is provided, high thermal responsiveness can be obtained and variation in responsiveness can be reduced.
Therefore, the present invention can measure temperature with high responsiveness and high accuracy, and is suitable as a means for detecting engine temperature, for example.

本発明に係る温度センサの第１実施形態を示す断面図である。It is sectional drawing which shows 1st Embodiment of the temperature sensor which concerns on this invention. 第１実施形態において、スリーブ部材を示す軸方向に直交する断面図である。In 1st Embodiment, it is sectional drawing orthogonal to the axial direction which shows a sleeve member. 本発明に係る温度センサの第２及び第３実施形態において、スリーブ部材を示す軸方向に直交する断面図である。In 2nd and 3rd embodiment of the temperature sensor which concerns on this invention, it is sectional drawing orthogonal to the axial direction which shows a sleeve member. 本発明に係る温度センサの第４及び第５実施形態において、スリーブ部材を示す軸方向に直交する断面図である。In 4th and 5th embodiment of the temperature sensor which concerns on this invention, it is sectional drawing orthogonal to the axial direction which shows a sleeve member. 本発明に係る温度センサの第６実施形態において、スリーブ部材を示す軸方向に直交する断面図及び図６のＡ−Ａ線断面図である。FIG. 7 is a cross-sectional view orthogonal to an axial direction showing a sleeve member and a cross-sectional view taken along line AA of FIG. 6 in a sixth embodiment of the temperature sensor according to the present invention. 第６実施形態の温度センサを示す断面図である。It is sectional drawing which shows the temperature sensor of 6th Embodiment. 本発明に係る温度センサにおいて、第１実施形態の他の例を示す断面図である。In the temperature sensor which concerns on this invention, it is sectional drawing which shows the other example of 1st Embodiment.

以下、本発明に係る温度センサの第１実施形態を、図１及び図２を参照しながら説明する。なお、以下の説明に用いる各図面では、各部材を認識可能又は認識容易な大きさとするために縮尺を適宜変更している。 Hereinafter, a temperature sensor according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In each drawing used for the following description, the scale is appropriately changed in order to make each member recognizable or easily recognizable.

本実施形態の温度センサ１は、図１及び図２に示すように、金属製の筒状部材２と、筒状部材２内に挿入された樹脂製のインナーキャップ３と、インナーキャップ３内に充填された樹脂で形成された成形樹脂部４と、成形樹脂部４内に封入された感熱素子５と、筒状部材２とインナーキャップ３との間であって感熱素子５の周囲に配され、外側が筒状部材２の内周面に当接すると共に内側がインナーキャップ３の外周面に当接した金属製のスリーブ部材６とを備えている。 As shown in FIGS. 1 and 2, the temperature sensor 1 of the present embodiment includes a metal cylindrical member 2, a resin inner cap 3 inserted into the cylindrical member 2, and an inner cap 3. Between the molded resin part 4 made of filled resin, the thermal element 5 enclosed in the molded resin part 4, the tubular member 2 and the inner cap 3, and arranged around the thermal element 5. And a metal sleeve member 6 whose outer side is in contact with the inner peripheral surface of the cylindrical member 2 and whose inner side is in contact with the outer peripheral surface of the inner cap 3.

上記筒状部材２は、銅、黄銅、アルミ等の金属で先端が閉鎖された筒状に形成されている。
この筒状部材２の先端側の外周には、取付用の雄ねじ部２ａが形成されている。
すなわち、この温度センサ１は、例えば冷却水又はエンジンオイルを循環する流路に関係なく、エンジンブロックの任意の位置に設けた雌ねじ部に、雄ねじ部２ａを螺着させて取り付け可能である。 The said cylindrical member 2 is formed in the cylinder shape which the front-end | tip closed with metals, such as copper, brass, and aluminum.
A male screw portion 2a for attachment is formed on the outer periphery on the distal end side of the cylindrical member 2.
That is, the temperature sensor 1 can be attached by screwing the male screw portion 2a to the female screw portion provided at an arbitrary position of the engine block regardless of the flow path for circulating cooling water or engine oil, for example.

上記感熱素子５は、雄ねじ部２ａの内側に配置されている。
この感熱素子５は、一対の電極（図示略）を有するチップ状又は板状のサーミスタ素子５ａと、サーミスタ素子５ａの一対の電極に一端が接続された一対のリード線５ｂと、一対のリード線５ｂの他端が一端に結線され電気的に接続された一対のコネクタ端子７とを備えている。
なお、サーミスタ素子５ａは、一対のリード線５ｂが接続された状態でガラス材等の絶縁性材料でコーティングされていても構わない。
上記コネクタ端子７は、銅、黄銅、ニッケル、ジュメット等の細長い金属板材で形成されている。 The thermal element 5 is arranged inside the male screw portion 2a.
The thermal element 5 includes a chip-like or plate-like thermistor element 5a having a pair of electrodes (not shown), a pair of lead wires 5b having one end connected to the pair of electrodes of the thermistor element 5a, and a pair of lead wires. The other end of 5b is provided with a pair of connector terminals 7 connected to one end and electrically connected.
The thermistor element 5a may be coated with an insulating material such as a glass material with a pair of lead wires 5b being connected.
The connector terminal 7 is formed of an elongated metal plate material such as copper, brass, nickel, or jumet.

上記成形樹脂部４は、インナーキャップ３内に射出成形によって感熱素子５と共に一体成形されている。この成形樹脂部４は、先端側に形成されインナーキャップ３内に充填された先端充填部４ａと、基端側に形成されたコネクタ部４ｂとを有している。
成形樹脂部４は、先端充填部４ａ内に配したサーミスタ素子５ａからリード線５ｂを含んでコネクタ端子７の一端までを封止している。
成形樹脂部４は、ＰＢＴ、ＰＡ、ＰＰＳ等の樹脂による射出成形で形成され、コネクタ部４ｂは、筒状部材２の開口端面に密着している。 The molded resin portion 4 is integrally formed with the thermal element 5 in the inner cap 3 by injection molding. The molded resin portion 4 has a distal end filling portion 4a formed on the distal end side and filled in the inner cap 3, and a connector portion 4b formed on the proximal end side.
The molded resin portion 4 seals from the thermistor element 5a disposed in the tip filling portion 4a to one end of the connector terminal 7 including the lead wire 5b.
The molded resin portion 4 is formed by injection molding using a resin such as PBT, PA, or PPS, and the connector portion 4 b is in close contact with the opening end surface of the tubular member 2.

上記インナーキャップ３は、例えばＰＰＳ樹脂等で先端が閉鎖された筒状に形成されている。
このインナーキャップ３は、スリーブ部材６の基端を係止可能な段部３ａを有している。すなわち、インナーキャップ３の先端部が基端部よりも小径に形成されており、先端部がスリーブ部材６に挿入され、先端部と基端部との境界に形成された段部３ａにスリーブ部材６の基端が当接した状態で、筒状部材２にインナーキャップ３が挿入される。
上記スリーブ部材６は、図２に示すように、断面円形状であり、高熱伝導性材料である銅やアルミニウム等で円筒状に形成されている。 The inner cap 3 is formed in a cylindrical shape whose tip is closed with, for example, PPS resin.
The inner cap 3 has a step portion 3 a that can lock the proximal end of the sleeve member 6. That is, the distal end portion of the inner cap 3 is formed with a smaller diameter than the proximal end portion, the distal end portion is inserted into the sleeve member 6, and the sleeve member is formed on the step portion 3 a formed at the boundary between the distal end portion and the proximal end portion. The inner cap 3 is inserted into the tubular member 2 with the proximal end of the 6 in contact.
As shown in FIG. 2, the sleeve member 6 has a circular cross section, and is formed in a cylindrical shape with copper, aluminum, or the like, which is a high thermal conductivity material.

このように本実施形態の温度センサ１では、筒状部材２とインナーキャップ３との間であって感熱素子５の周囲に配され、外側が筒状部材２の内周面に当接すると共に内側がインナーキャップ３の外周面に当接した金属製のスリーブ部材６を備えているので、スリーブ部材６を介して筒状部材２とインナーキャップ３とを熱的に結合させると共に全周から熱を伝えることで受熱面積を大きくでき、高い熱応答性を得ることができる。また、インナーキャップ３によって感熱素子５及びコネクタ端子７が位置決めされると共に成形樹脂部４の径を小さく設定でき、熱応答性のばらつきを低減することができる。これにより、被検知体の温度に対して検知温度差も小さくすることができる。 As described above, in the temperature sensor 1 according to the present embodiment, the temperature sensor 1 is disposed between the tubular member 2 and the inner cap 3 and around the thermal element 5, and the outside contacts the inner circumferential surface of the tubular member 2 and the inside. Is provided with a metal sleeve member 6 that is in contact with the outer peripheral surface of the inner cap 3, so that the tubular member 2 and the inner cap 3 are thermally coupled via the sleeve member 6 and heat is applied from the entire circumference. By transmitting, the heat receiving area can be increased and high thermal responsiveness can be obtained. Moreover, the thermal element 5 and the connector terminal 7 are positioned by the inner cap 3, and the diameter of the molded resin portion 4 can be set small, so that variations in thermal response can be reduced. Thereby, a detection temperature difference can also be made small with respect to the temperature of the body to be detected.

さらに、小型の感熱素子５を適用した場合、筒状部材２とインナーキャップ３との間にスリーブ部材６が設置されることで、インナーキャップ３の外径を細くすることができ、成形樹脂部４の樹脂の充填量を増やさないことで熱応答性を速くすることができる。なお、インナーキャップ３内に射出成形によって成形樹脂部４を充填する場合、充填される樹脂の圧力でインナーキャップ３が膨張し、ひび割れすることを、スリーブ部材６がインナーキャップ３の外側を支持することで防止することができる。 Furthermore, when the small thermal element 5 is applied, the outer diameter of the inner cap 3 can be reduced by installing the sleeve member 6 between the tubular member 2 and the inner cap 3, and the molded resin portion The thermal responsiveness can be increased by not increasing the filling amount of the resin No. 4. When the molded resin portion 4 is filled into the inner cap 3 by injection molding, the sleeve member 6 supports the outside of the inner cap 3 that the inner cap 3 expands and cracks due to the pressure of the filled resin. This can be prevented.

また、感熱素子５が、雄ねじ部２ａの内側に配置されているので、雄ねじ部２ａを被検知体の雌ねじ部に螺着させた際に、螺接面の内側に感熱素子５を位置決めできる。また、雄ねじ部２ａによって温度センサ１の被検知体への取り付けが容易になると共にレイアウトの自由度も高くなる。 In addition, since the thermal element 5 is disposed inside the male screw portion 2a, the thermal element 5 can be positioned inside the screw contact surface when the male screw portion 2a is screwed to the female screw portion of the body to be detected. Further, the male screw portion 2a facilitates the attachment of the temperature sensor 1 to the detected body and increases the degree of freedom in layout.

また、インナーキャップ３が、スリーブ部材６の基端を係止可能な段部３ａを有しているので、段部３ａにスリーブ部材６が係止されることでスリーブ部材６を軸方向に位置決めすることができる。
さらに、スリーブ部材６が、断面円形状であるので、筒状部材２からの熱を周方向で均一にインナーキャップ３に伝えることができる。 Moreover, since the inner cap 3 has the step part 3a which can lock the base end of the sleeve member 6, the sleeve member 6 is locked to the step part 3a, thereby positioning the sleeve member 6 in the axial direction. can do.
Furthermore, since the sleeve member 6 has a circular cross section, the heat from the tubular member 2 can be uniformly transmitted to the inner cap 3 in the circumferential direction.

次に、本発明に係る温度センサの第２から第６実施形態について、図３から図６を参照して以下に説明する。なお、以下の各実施形態の説明において、上記実施形態において説明した同一の構成要素には同一の符号を付し、その説明は省略する。 Next, second to sixth embodiments of the temperature sensor according to the present invention will be described below with reference to FIGS. In the following description of each embodiment, the same constituent elements described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

第２実施形態と第１実施形態との異なる点は、第１実施形態では、スリーブ部材６が単純な円筒状であるのに対し、第２実施形態の温度センサでは、図３の（ａ）に示すように、スリーブ部材２６が、中央円筒部２６ａと、中央円筒部２６ａの外周面から半径方向に突出した複数の弾性部２６ｂとを備えている点である。
すなわち、第２実施形態のスリーブ部材２６は、半径方向に弾性を有する３つの弾性部２６ｂを有している。これら弾性部２６ｂは、周方向に等間隔に設けられている。 The difference between the second embodiment and the first embodiment is that in the first embodiment, the sleeve member 6 has a simple cylindrical shape, whereas in the temperature sensor of the second embodiment, (a) in FIG. As shown in FIG. 3, the sleeve member 26 includes a central cylindrical portion 26a and a plurality of elastic portions 26b protruding in the radial direction from the outer peripheral surface of the central cylindrical portion 26a.
That is, the sleeve member 26 of the second embodiment has three elastic portions 26b having elasticity in the radial direction. These elastic portions 26b are provided at equal intervals in the circumferential direction.

上記弾性部２６ｂは、断面円弧状の板状部であり、その半径方向先端部は、筒状部材２の内周面に当接する。また、上記中央円筒部２６ａ内には、インナーキャップ３が挿入される。
このように第２実施形態の温度センサでは、スリーブ部材２６が、半径方向に弾性を有する弾性部２６ｂを有しているので、弾性部２６ｂの弾性によって外部からの振動や衝撃を緩和してインナーキャップ３内の感熱素子５を保護することができる。
また、各弾性部２６ｂの間には、周方向に３つの中空領域が形成されるため、これら中空領域によってスリーブ部材６の熱容量が第１実施形態に比べて小さくなり、熱応答性を速くすることができる。 The elastic part 26 b is a plate-like part having an arcuate cross section, and its distal end in the radial direction is in contact with the inner peripheral surface of the tubular member 2. The inner cap 3 is inserted into the central cylindrical part 26a.
As described above, in the temperature sensor according to the second embodiment, the sleeve member 26 includes the elastic portion 26b having elasticity in the radial direction. The heat sensitive element 5 in the cap 3 can be protected.
Further, since three hollow regions are formed in the circumferential direction between the elastic portions 26b, the heat capacity of the sleeve member 6 is reduced by these hollow regions as compared with the first embodiment, and the thermal responsiveness is increased. be able to.

次に、第３実施形態と第２実施形態との異なる点は、第２実施形態では、スリーブ部材２６の弾性部２６ｂが筒状部材２の内周面に接触するのに対し、第３実施形態の温度センサでは、図３の（ｂ）に示すように、弾性部３６ｂの半径方向先端に設けられた外周面部３６ｃが筒状部材２の内周面に接触している点である。
すなわち、第３実施形態のスリーブ部材３６は、筒状部材２に当接する外周面部３６ｃと、インナーキャップ３に当接する内周面部３６ａとを備え、外周面部３６ｃと内周面部３６ａとの間に中空部３６ｄを有している。内周面部３６ａは、インナーキャップ３が挿入可能な円筒状であり、外周面部３６ｃは、筒状部材２の内周面に接触可能な円筒状である。 Next, the difference between the third embodiment and the second embodiment is that in the second embodiment, the elastic portion 26b of the sleeve member 26 is in contact with the inner peripheral surface of the tubular member 2, whereas the third embodiment is different. In the embodiment of the temperature sensor, as shown in FIG. 3B, the outer peripheral surface portion 36 c provided at the distal end in the radial direction of the elastic portion 36 b is in contact with the inner peripheral surface of the cylindrical member 2.
That is, the sleeve member 36 of the third embodiment includes an outer peripheral surface portion 36c that contacts the tubular member 2 and an inner peripheral surface portion 36a that contacts the inner cap 3, and is between the outer peripheral surface portion 36c and the inner peripheral surface portion 36a. It has a hollow portion 36d. The inner peripheral surface portion 36 a is a cylindrical shape into which the inner cap 3 can be inserted, and the outer peripheral surface portion 36 c is a cylindrical shape that can contact the inner peripheral surface of the tubular member 2.

また、弾性部３６ｂは、内周面部３６ａの外周に半径方向に突出した板状部である。これら弾性部３６ｂは、周方向に等間隔に４つ設けられている。
上記中空部３６ｄは、内周面部３６ａと弾性部３６ｂと外周面部３６ｃとで囲まれた中空領域であり、周方向に４つ設けられている。なお、中空構造を有していても、弾性部３６ｂの弾性力（バネ力）によって外部からの振動や衝撃にも強く、高い信頼性が得られる。 The elastic portion 36b is a plate-like portion protruding in the radial direction on the outer periphery of the inner peripheral surface portion 36a. Four elastic portions 36b are provided at equal intervals in the circumferential direction.
The hollow portion 36d is a hollow region surrounded by the inner peripheral surface portion 36a, the elastic portion 36b, and the outer peripheral surface portion 36c, and four hollow portions are provided in the circumferential direction. Even if it has a hollow structure, it is resistant to external vibrations and impacts due to the elastic force (spring force) of the elastic portion 36b, and high reliability can be obtained.

このように第３実施形態の温度センサでは、外周面部３６ｃと内周面部３６ａとの間に中空部３６ｄを有しているので、中空部３６ｄによってスリーブ部材３６の熱容量が小さくなるため、熱応答性を速くすることができる。特に、インナーキャップ３の外径を細くした場合、筒状部材２とインナーキャップ３との間のクリアランスが広くなるが、中空部３６ｄを有するスリーブ部材３６を用いることで、熱容量の増大を抑制してインナーキャップ３を筒状部材２内に固定することができる。また、外周面部３６ｃが全周にわたって筒状部材２の内周面に当接するため、第２実施形態に比べて高い熱伝導を得ることができる。 As described above, in the temperature sensor according to the third embodiment, since the hollow portion 36d is provided between the outer peripheral surface portion 36c and the inner peripheral surface portion 36a, the heat capacity of the sleeve member 36 is reduced by the hollow portion 36d. Sex can be made faster. In particular, when the outer diameter of the inner cap 3 is reduced, the clearance between the tubular member 2 and the inner cap 3 is increased. However, by using the sleeve member 36 having the hollow portion 36d, an increase in heat capacity is suppressed. The inner cap 3 can be fixed in the cylindrical member 2. Moreover, since the outer peripheral surface part 36c contacts the inner peripheral surface of the cylindrical member 2 over the entire circumference, it is possible to obtain higher heat conduction than in the second embodiment.

次に、第４実施形態と第１実施形態との異なる点は、第１実施形態では、スリーブ部材６が単純な円筒形状であるのに対し、第４実施形態の温度センサでは、図４の（ａ）に示すように、スリーブ部材４６が、大小２つの円筒が組み合わさった形状に近い変形した筒形状とされている点である。
すなわち、第４実施形態のスリーブ部材４６は、インナーキャップ３が挿入されインナーキャップ３の外周面が当接される断面略円形状の小径筒状部４６ａと、小径筒状部４６ａよりも径が大きく小径筒状部４６ａに隣接した断面略円形状の大径筒状部４６ｂとで構成されている。 Next, the difference between the fourth embodiment and the first embodiment is that in the first embodiment, the sleeve member 6 has a simple cylindrical shape, whereas in the temperature sensor of the fourth embodiment, FIG. As shown to (a), the sleeve member 46 is the point made into the deformed cylinder shape close | similar to the shape which two large and small cylinders combined.
That is, the sleeve member 46 of the fourth embodiment has a smaller diameter cylindrical portion 46a having a substantially circular cross section in which the inner cap 3 is inserted and the outer peripheral surface of the inner cap 3 is in contact, and the diameter is smaller than that of the smaller diameter cylindrical portion 46a. A large-diameter cylindrical portion 46b having a substantially circular cross section adjacent to the small-diameter cylindrical portion 46a.

小径筒状部４６ａと大径筒状部４６ｂとは、互いに切りかかれた部分で結合されており、断面形状がどちらも円形に近い円弧状とされている。また、インナーキャップ３が挿入されていない大径筒状部４６ｂは、内部が中空とされている。
小径筒状部４６ａ内にインナーキャップ３を設置する場合、小径筒状部４６ａの開口端からインナーキャップ３を圧入、挿入しても構わないが、大径筒状部４６ｂ内に挿入したインナーキャップ３を小径筒状部４６ａの横開口部（大径筒状部４６ｂとの連結部）から小径筒状部４６ａ内に押し込んでも構わない。このように小径筒状部４６ａは、インナーキャップ３の外周を挟持するクリップ的な機能を有している。 The small-diameter cylindrical portion 46a and the large-diameter cylindrical portion 46b are joined at a portion cut away from each other, and both have a circular arc shape in cross section. Moreover, the inside of the large diameter cylindrical part 46b in which the inner cap 3 is not inserted is hollow.
When installing the inner cap 3 in the small diameter cylindrical portion 46a, the inner cap 3 may be press-fitted and inserted from the opening end of the small diameter cylindrical portion 46a, but the inner cap inserted in the large diameter cylindrical portion 46b. 3 may be pushed into the small-diameter cylindrical portion 46a from the lateral opening of the small-diameter cylindrical portion 46a (the connecting portion with the large-diameter cylindrical portion 46b). As described above, the small-diameter cylindrical portion 46 a has a clip-like function of sandwiching the outer periphery of the inner cap 3.

このスリーブ部材４６では、筒状部材２内に挿入した状態では、インナーキャップ３が挿入された小径筒状部４６ａが筒状部材２の中心軸から外れて筒状部材２の内周面に近接した状態となる。すなわち、大径筒状部４６ｂの弾性力によって小径筒状部４６ａが筒状部材２の内周面に密着状態に押し付けられ、小径筒状部４６ａ内のインナーキャップ３及び感熱素子５も筒状部材２の内周面に近接されている。このように、スリーブ部材４６では、大径筒状部４６ｂだけでなく、小径筒状部４６ａの一部が、筒状部材２の内周面に当接している。 In the sleeve member 46, when inserted into the tubular member 2, the small-diameter tubular portion 46 a into which the inner cap 3 is inserted is separated from the central axis of the tubular member 2 and is close to the inner peripheral surface of the tubular member 2. It will be in the state. That is, the small-diameter cylindrical portion 46a is pressed against the inner peripheral surface of the cylindrical member 2 by the elastic force of the large-diameter cylindrical portion 46b, and the inner cap 3 and the thermal element 5 in the small-diameter cylindrical portion 46a are also cylindrical. It is close to the inner peripheral surface of the member 2. As described above, in the sleeve member 46, not only the large-diameter cylindrical portion 46 b but also a part of the small-diameter cylindrical portion 46 a is in contact with the inner peripheral surface of the cylindrical member 2.

したがって、第４実施形態の温度センサでは、インナーキャップ３が小径筒状部４６ａ内に配されることで、感熱素子５が筒状部材２の内周面に近接して高い応答性を得ることができる。また、大径筒状部４６ｂが弾性部として機能することで、外部からの振動や衝撃を緩和可能であると共に、大径筒状部４６ｂ内が中空部４６ｄとなることで、スリーブ部材４６の熱容量を小さくすることができる。なお、スリーブ部材４６と筒状部材２との隙間は、射出成形時に樹脂で充填しても構わない。 Therefore, in the temperature sensor of the fourth embodiment, the inner cap 3 is disposed in the small diameter cylindrical portion 46a, so that the thermal element 5 is close to the inner peripheral surface of the cylindrical member 2 and obtains high responsiveness. Can do. Further, the large-diameter cylindrical portion 46b functions as an elastic portion, so that vibrations and impacts from the outside can be mitigated, and the inside of the large-diameter cylindrical portion 46b becomes a hollow portion 46d. The heat capacity can be reduced. The gap between the sleeve member 46 and the cylindrical member 2 may be filled with resin at the time of injection molding.

次に、第５実施形態と第２実施形態との異なる点は、第２実施形態では、スリーブ部材２６の弾性部２６ｂが断面円弧状であるのに対し、第５実施形態の温度センサでは、図４の（ｂ）に示すように、スリーブ部材５６が、断面直線状で中心円筒部５６ａから半径方向に突出した複数の弾性部５６ｂを備えている点である。
これら弾性部５６ｂは、周方向に等間隔に４つ設けられている。
このように第５実施形態の温度センサにおいても、第２実施形態と同様に、複数の弾性部５６ｂが設けられているので、外部からの振動や衝撃を緩和することができる。 Next, the difference between the fifth embodiment and the second embodiment is that in the second embodiment, the elastic portion 26b of the sleeve member 26 has a circular arc shape, whereas in the temperature sensor of the fifth embodiment, As shown in FIG. 4B, the sleeve member 56 is provided with a plurality of elastic portions 56b that are linear in cross section and protrude from the central cylindrical portion 56a in the radial direction.
Four elastic portions 56b are provided at equal intervals in the circumferential direction.
As described above, in the temperature sensor according to the fifth embodiment as well, since the plurality of elastic portions 56b are provided as in the second embodiment, vibrations and impacts from the outside can be reduced.

次に、第６実施形態と第３実施形態との異なる点は、第３実施形態では、スリーブ部材３６が、インナーキャップ３の外周面に当接する円筒状の内周面部３６ａと、筒状部材２の内周面に当接する円筒状の外周面部３６ｃと、内周面部３６ａと外周面部３６ｃとを接続する弾性部３６ｂとを有しているのに対し、第６実施形態の温度センサ６１では、図５及び図６に示すように、スリーブ部材６６が、インナーキャップ３の外周面に当接する断面円弧状の内周面部６６ａと、筒状部材２の内周面に当接する断面円弧状の一対の外周面部６６ｃと、内周面部６６ａと外周面部６６ｃとを接続する接続部６６ｂとを有している点である。 Next, the difference between the sixth embodiment and the third embodiment is that in the third embodiment, the sleeve member 36 has a cylindrical inner peripheral surface portion 36a that abuts on the outer peripheral surface of the inner cap 3, and a cylindrical member. The temperature sensor 61 of the sixth embodiment has a cylindrical outer peripheral surface portion 36c that contacts the inner peripheral surface 2 and an elastic portion 36b that connects the inner peripheral surface portion 36a and the outer peripheral surface portion 36c. As shown in FIGS. 5 and 6, the sleeve member 66 has an inner circumferential surface portion 66 a that is in contact with the outer peripheral surface of the inner cap 3 and an inner peripheral surface portion 66 a that is in contact with the inner peripheral surface of the tubular member 2. It is a point which has a pair of outer peripheral surface part 66c and the connection part 66b which connects the inner peripheral surface part 66a and the outer peripheral surface part 66c.

上記内周面部６６ａは、インナーキャップ３が挿入可能で円形に近い円弧状の断面形状を有し、上記外周面部６６ｃは、筒状部材２内に挿入可能で一対で円形に近い円弧状の断面形状を有している。一対の外周面部６６ｃは、互いに対向した断面円弧状とされ、内周面部６６ａとの間に中空部６６ｄを有している。これら内周面部６６ａ、接続部６６ｂ及び外周面部６６ｃは、一枚の銅薄板を折り曲げて一体に形成され、全体として半径方向に弾性を有している。 The inner peripheral surface portion 66a has an arc-like cross-sectional shape into which the inner cap 3 can be inserted, and the outer peripheral surface portion 66c can be inserted into the cylindrical member 2 and has a pair of circular arc-like cross-sections. It has a shape. The pair of outer peripheral surface portions 66c has a circular arc shape facing each other, and has a hollow portion 66d between the inner peripheral surface portion 66a. The inner peripheral surface portion 66a, the connecting portion 66b, and the outer peripheral surface portion 66c are integrally formed by bending a single copper thin plate, and have elasticity in the radial direction as a whole.

このように第６実施形態の温度センサ６１では、スリーブ部材６６が、半径方向に弾性を有しているので、バネ力によって外周面部６６ｃが筒状部材２の内周面に密着すると共に、外部からの振動や衝撃を緩和可能である。また、中空部６６ｄを有しているので、スリーブ部材６６の熱容量を小さくすることができる。 Thus, in the temperature sensor 61 of the sixth embodiment, since the sleeve member 66 has elasticity in the radial direction, the outer peripheral surface portion 66c is brought into close contact with the inner peripheral surface of the tubular member 2 by the spring force, and the outside. The vibration and impact from can be reduced. Further, since the hollow portion 66d is provided, the heat capacity of the sleeve member 66 can be reduced.

なお、本発明の技術範囲は上記各実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

例えば、上記第１実施形態では、コネクタ部４ｂを有した成形樹脂部４を備えたコネクタ一体型の温度センサであるが、図７に示すように、先端充填部７４ａを有するがコネクタ部が無い成形樹脂部７４を備え、リード線５ｂの基端に外部リード線である被覆リード線７７が接続された温度センサ７１としても構わない。この場合、インナーキャップ３内部の成形樹脂部７４は、射出成形による樹脂ではなく、エポキシ樹脂、無機接着剤等の樹脂充填材を用いてもよい。 For example, in the first embodiment, the connector-integrated temperature sensor includes the molded resin portion 4 having the connector portion 4b. However, as shown in FIG. 7, the tip filling portion 74a is provided but the connector portion is not present. The temperature sensor 71 may include a molded resin portion 74 and a covered lead wire 77 that is an external lead wire connected to the proximal end of the lead wire 5b. In this case, the molded resin portion 74 inside the inner cap 3 may be made of a resin filler such as an epoxy resin or an inorganic adhesive, instead of a resin formed by injection molding.

１，６１，７１…温度センサ、２…筒状部材、２ａ…雄ねじ部、３…インナーキャップ、３ａ…段部、４，７４…成形樹脂部、５…感熱素子、６，２６，３６，４６，５６，６６…スリーブ部材、２６ｂ，３６ｂ，５６ｂ…弾性部、３６ａ，６６ａ…内周面部、３６ｄ，４６ｄ、６６ｄ…中空部、３６ｃ，６６ｃ…外周面部 DESCRIPTION OF SYMBOLS 1,61,71 ... Temperature sensor, 2 ... Cylindrical member, 2a ... Male screw part, 3 ... Inner cap, 3a ... Step part, 4, 74 ... Molding resin part, 5 ... Thermal element, 6, 26, 36, 46 , 56, 66 ... sleeve member, 26b, 36b, 56b ... elastic part, 36a, 66a ... inner peripheral surface part, 36d, 46d, 66d ... hollow part, 36c, 66c ... outer peripheral surface part

Claims

A metal tubular member;
A resin inner cap inserted into the tubular member;
A molded resin portion formed of a resin at least partially filled in the inner cap;
A thermal element enclosed in the molded resin portion;
Metal between the cylindrical member and the inner cap and disposed around the thermal element, the outer side contacting the inner peripheral surface of the cylindrical member and the inner side contacting the outer peripheral surface of the inner cap A sleeve member made of ,
The temperature sensor , wherein the sleeve member is in contact with the tip of the outer peripheral surface of the inner cap beyond the tip of the thermosensitive element .

The temperature sensor according to claim 1,
A male screw portion is formed on the outer periphery of the cylindrical member,
The temperature sensor, wherein the thermosensitive element is disposed inside the male screw portion.

The temperature sensor according to claim 1 or 2,
The temperature sensor, wherein the inner cap has a stepped portion capable of locking the proximal end of the sleeve member.

The temperature sensor according to any one of claims 1 to 3,
The temperature sensor, wherein the sleeve member has a circular cross section.

The temperature sensor according to any one of claims 1 to 3,
The temperature sensor, wherein the sleeve member has an elastic portion having elasticity in a radial direction.

The temperature sensor according to any one of claims 1 to 3,
An outer peripheral surface part where the sleeve member abuts on the cylindrical member;
An inner peripheral surface portion that contacts the inner cap,
A temperature sensor comprising a hollow portion between the outer peripheral surface portion and the inner peripheral surface portion.