JP6783819B2 - Sensor - Google Patents

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JP6783819B2
JP6783819B2 JP2018090836A JP2018090836A JP6783819B2 JP 6783819 B2 JP6783819 B2 JP 6783819B2 JP 2018090836 A JP2018090836 A JP 2018090836A JP 2018090836 A JP2018090836 A JP 2018090836A JP 6783819 B2 JP6783819 B2 JP 6783819B2
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sensor
region
buffer
fixing
rear end
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JP2018205306A (en
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拓馬 野村
拓馬 野村
悠介 川合
悠介 川合
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NGK Spark Plug Co Ltd
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Description

本開示は、センサ固定部に取り付けられて状態量を検出するセンサに関する。 The present disclosure relates to a sensor attached to a sensor fixing portion to detect a state quantity.

センサとして、螺合挟持部による螺合によりセンサ固定部に取り付けられる構成のセンサが知られている。具体的には、センサ本体部から突出する鍔部を、螺合挟持部とセンサ固定部との間に挟持することで、センサがセンサ固定部に取り付けられる構成である(特許文献1参照)。 As a sensor, a sensor having a configuration in which it is attached to a sensor fixing portion by screwing with a screw holding portion is known. Specifically, the sensor is attached to the sensor fixing portion by sandwiching the flange portion protruding from the sensor main body portion between the screw holding portion and the sensor fixing portion (see Patent Document 1).

このようなセンサは、螺合固定時に螺合挟持部とともにセンサ本体部が回転してしまう場合があり、センサ固定部に対するセンサの回転方向における位置決めが難しい場合がある。 In such a sensor, the sensor main body may rotate together with the screw holding portion at the time of screw fixing, and it may be difficult to position the sensor with respect to the sensor fixing portion in the rotation direction.

これに対して、螺合挟持部とセンサ本体部との間に緩衝部を配置して、螺合挟持部とセンサ本体部とが直接接触しない構成とすることで、螺合固定時におけるセンサの回転移動を抑制する手法がある。 On the other hand, by arranging a cushioning portion between the screw holding portion and the sensor main body portion so that the screw holding portion and the sensor main body portion do not come into direct contact with each other, the sensor can be screwed and fixed. There is a method of suppressing rotational movement.

さらに、緩衝部に回り止め部を形成し、センサ固定部に形成された位置決め部に対して回り止め部を係合することで、螺合固定時に緩衝部が回転するのを抑制でき、センサ本体部の回転を確実に抑制できる。 Further, by forming a detent portion in the cushioning portion and engaging the detent portion with the positioning portion formed in the sensor fixing portion, it is possible to suppress the rotation of the detent portion during screw fixing, and the sensor main body. The rotation of the part can be reliably suppressed.

特開2014−231831号公報Japanese Unexamined Patent Publication No. 2014-231831

しかし、上記のセンサにおいては、回り止め部を形成することで緩衝部の回転を抑制できるが、センサ本体部と緩衝部との相対位置が変化可能であるために、センサ本体部が回転する可能性がある。 However, in the above sensor, the rotation of the buffer portion can be suppressed by forming the detent portion, but the sensor main body portion can rotate because the relative position between the sensor main body portion and the buffer portion can be changed. There is sex.

つまり、緩衝部の回転を抑制できたとしても、センサ本体部が回転すると、センサ固定部に対するセンサの回転方向位置を特定位置に定めることができない場合がある。
そこで、螺合挟持部による螺合によりセンサ固定部に取り付けられる構成のセンサにおいて、センサ固定部に対するセンサ自身の回転方向位置を特定できるセンサを提供することを目的とする。
That is, even if the rotation of the buffer portion can be suppressed, when the sensor main body portion rotates, the rotation direction position of the sensor with respect to the sensor fixing portion may not be determined at a specific position.
Therefore, it is an object of the present invention to provide a sensor capable of specifying the rotational position of the sensor itself with respect to the sensor fixing portion in a sensor having a configuration of being attached to the sensor fixing portion by screwing with a screw holding portion.

本開示の一態様は、センサ固定部に取り付けられて状態量を検出するセンサであって、センサ本体部と、鍔部と、螺合挟持部と、緩衝部と、を備える。
センサ本体部は、軸線方向に延びる長尺形状に形成されて、軸線方向の先端側に状態量を検出する検知部を有するように構成されている。鍔部は、センサ本体部の外周面から径方向外側に突出して形成される。螺合挟持部は、センサ固定部に形成された固定用螺合溝と螺合する螺合部を有し、センサ固定部との間で鍔部を挟持するよう構成されている。緩衝部は、鍔部に当接する先端面と螺合挟持部に当接する後端面とを備えて、鍔部と螺合挟持部との間に配置される。
One aspect of the present disclosure is a sensor attached to a sensor fixing portion to detect a state quantity, and includes a sensor main body portion, a collar portion, a screw holding portion, and a cushioning portion.
The sensor main body is formed in a long shape extending in the axial direction, and is configured to have a detection unit for detecting a state quantity on the tip side in the axial direction. The collar portion is formed so as to project radially outward from the outer peripheral surface of the sensor main body portion. The screw holding portion has a screw portion that is screwed with a fixing screw groove formed in the sensor fixing portion, and is configured to sandwich the collar portion between the screw holding portion and the sensor fixing portion. The cushioning portion includes a front end surface that contacts the flange portion and a rear end surface that contacts the screw holding portion, and is arranged between the flange portion and the screw holding portion.

そして、緩衝部は、回り止め部と、溶接固定部と、を備える。回り止め部は、緩衝部の外周面から径方向外側に突出する形態であって、センサ固定部に形成された位置決め部と係合するように構成されている。溶接固定部は、緩衝部の先端面と鍔部とを溶接により固定するように構成されている。 The cushioning portion includes a detent portion and a welding fixing portion. The detent portion has a form of projecting radially outward from the outer peripheral surface of the cushioning portion, and is configured to engage with a positioning portion formed on the sensor fixing portion. The weld fixing portion is configured to fix the tip surface of the cushioning portion and the flange portion by welding.

さらに、緩衝部は、自身の外表面に、熱により表面状態が変化した熱焼け領域と、熱による表面状態の変化が生じていない通常領域と、を備える構成である。そして、緩衝部は、先端面および外周面には少なくとも熱焼け領域を備え、後端面には通常領域のみを備えるように構成されている。 Further, the buffer portion has a configuration in which the outer surface of the cushioning portion includes a heat-burned region whose surface state has changed due to heat and a normal region whose surface state has not changed due to heat. The cushioning portion is configured to have at least a heat-burned region on the front end surface and the outer peripheral surface, and only a normal region on the rear end surface.

このセンサにおける緩衝部は、自身の外表面のうち先端面および外周面には熱焼け領域が存在するが、自身の外表面のうち後端面には、通常領域のみが存在し、熱焼け領域が存在しないように構成されている。 The buffer portion in this sensor has a heat-burned region on the front end surface and the outer peripheral surface of its own outer surface, but only a normal region exists on the rear end surface of its own outer surface, and the heat-burned region is present. It is configured so that it does not exist.

このように、緩衝部の後端面に熱焼け領域が存在しない構成であれば、緩衝部の後端面と螺合挟持部との間の摩擦力の増大を抑制できるため、螺合挟持部の螺合作業時に生じる摩擦力によって緩衝部の回り止め部が破損することを抑制できる。これにより、螺合挟持部の螺合作業時における緩衝部の回転を抑制でき、センサの回転も抑制できるため、センサの位置ズレを抑制できる。 As described above, if the configuration does not have a heat-burned region on the rear end surface of the shock absorber, an increase in frictional force between the rear end surface of the shock absorber and the screw holding portion can be suppressed, so that the screw of the screw holding portion is screwed. It is possible to prevent the detent portion of the cushioning portion from being damaged by the frictional force generated during the joint work. As a result, the rotation of the cushioning portion during the screwing operation of the screw holding portion can be suppressed, and the rotation of the sensor can also be suppressed, so that the displacement of the sensor can be suppressed.

よって、このセンサによれば、螺合挟持部の螺合作業時におけるセンサの位置ズレを抑制できるため、センサ固定部に対するセンサ自身の回転方向位置を容易に特定できる。
次に、上記のセンサにおいては、鍔部および緩衝部は、オーステナイト系又はフェライト系のステンレス鋼で形成されてもよい。
Therefore, according to this sensor, it is possible to suppress the displacement of the sensor during the screwing operation of the screw holding portion, so that the position of the sensor itself in the rotation direction with respect to the sensor fixing portion can be easily specified.
Next, in the above sensor, the flange portion and the buffer portion may be made of austenitic or ferritic stainless steel.

オーステナイト系又はフェライト系のステンレス鋼は、耐熱性に優れるため、高温環境下でセンサが使用される場合にも信頼性の高いセンサを提供することができる。また、ステンレス鋼は安価であるため、溶接固定部を設けることによる材料コストの大幅な増加を抑制できる。 Since austenitic or ferritic stainless steel has excellent heat resistance, it is possible to provide a highly reliable sensor even when the sensor is used in a high temperature environment. Further, since stainless steel is inexpensive, it is possible to suppress a significant increase in material cost due to the provision of the welded fixing portion.

次に、上記のセンサにおいては、鍔部、緩衝部、螺合挟持部は、全てオーステナイト系のステンレス鋼で形成されるか、または、全てフェライト系のステンレス鋼で形成されるかのいずれかであってもよい。 Next, in the above sensor, the collar portion, the cushioning portion, and the screw holding portion are either all formed of austenitic stainless steel or all formed of ferritic stainless steel. There may be.

つまり、鍔部、緩衝部、螺合挟持部が、全てオーステナイト系のステンレス鋼、あるいは、全てフェライト系のステンレス鋼で形成されることで、センサを温度変化の激しい用途に用いる場合に、使用環境下において線熱膨張係数の違いによる溶接固定部の破断や螺合の緩みが生じがたくなる。これにより、温度変化の激しい用途に用いる場合でも、使用環境下においてセンサ固定部におけるセンサの位置ズレが発生することを抑制できる。 In other words, the flange, cushioning, and screw-holding parts are all made of austenitic stainless steel or all ferritic stainless steel, so that the usage environment is used when the sensor is used in applications where the temperature changes drastically. Underneath, it becomes difficult for the welded fixed portion to break or loosen due to the difference in the coefficient of linear thermal expansion. As a result, even when the sensor is used in an application where the temperature changes drastically, it is possible to prevent the sensor from being displaced in the sensor fixing portion under the usage environment.

次に、上記のセンサにおいては、回り止め部は、熱焼け領域および溶接固定部から離れた位置に形成されてもよい。
このような構成であれば、センサの製造段階において、熱の影響により回り止め部が変質することを抑制でき、変質により回り止め部の強度が低下することを抑制できる。これにより、螺合挟持部の螺合作業時やセンサの使用環境下において、回り止め部の破損が生じがたくなり、センサ固定部におけるセンサの位置ズレが発生することを抑制できる。
Next, in the above sensor, the detent portion may be formed at a position away from the heat-burned region and the weld fixing portion.
With such a configuration, it is possible to suppress the deterioration of the detent portion due to the influence of heat at the manufacturing stage of the sensor, and it is possible to suppress the decrease in the strength of the detent portion due to the alteration. As a result, it is possible to prevent the detent portion from being damaged during the screwing operation of the screw holding portion or under the environment in which the sensor is used, and to prevent the sensor from being displaced at the sensor fixing portion.

次に、本開示の他の一態様は、センサ固定部に取り付けられて状態量を検出するセンサであって、センサ本体部と、鍔部と、螺合挟持部と、緩衝部と、を備える。
センサ本体部は、軸線方向に延びる長尺形状に形成されて、軸線方向の先端側に状態量を検出する検知部を有するように構成されている。鍔部は、センサ本体部の外周面から径方向外側に突出して形成される。螺合挟持部は、センサ固定部に形成された固定用螺合溝と螺合する螺合部を有し、センサ固定部との間で鍔部を挟持するよう構成されている。緩衝部は、鍔部に当接する先端面と螺合挟持部に当接する後端面とを備えて、鍔部と螺合挟持部との間に配置される。
Next, another aspect of the present disclosure is a sensor attached to a sensor fixing portion to detect a state quantity, which includes a sensor main body portion, a collar portion, a screw holding portion, and a cushioning portion. ..
The sensor main body is formed in a long shape extending in the axial direction, and is configured to have a detection unit for detecting a state quantity on the tip side in the axial direction. The collar portion is formed so as to project radially outward from the outer peripheral surface of the sensor main body portion. The screw holding portion has a screw portion that is screwed with a fixing screw groove formed in the sensor fixing portion, and is configured to sandwich the collar portion between the screw holding portion and the sensor fixing portion. The cushioning portion includes a front end surface that contacts the flange portion and a rear end surface that contacts the screw holding portion, and is arranged between the flange portion and the screw holding portion.

そして、緩衝部は、緩衝本体部と、回り止め部と、溶接固定部と、を備える。緩衝本体部は、鍔部と螺合挟持部との間に配置される。回り止め部は、緩衝本体部の外周面から径方向外側に突出する形態であって、センサ固定部に形成された位置決め部と係合するように構成されている。溶接固定部は、緩衝本体部の先端面と鍔部とを溶接により固定するように構成されている。 The cushioning portion includes a cushioning main body portion, a detent portion, and a welding fixing portion. The buffer body portion is arranged between the collar portion and the screw holding portion. The detent portion has a form of protruding outward in the radial direction from the outer peripheral surface of the buffer main body portion, and is configured to engage with a positioning portion formed on the sensor fixing portion. The weld fixing portion is configured to fix the tip surface of the buffer body portion and the flange portion by welding.

緩衝本体部の先端面および緩衝本体部の外周面は、溶接固定部に隣接する溶接隣接領域を備える。緩衝本体部の後端面は、溶接隣接領域の酸化量よりも酸化量が小さい低酸化領域のみを備える。低酸化領域の酸化量は、第1判定基準値未満である。第1判定基準値は、溶接隣接領域の酸化量から第1特定割合相当値を差し引いた値である。第1特定割合相当値は、酸化量差分値に対する50%相当値である。酸化量差分値は、溶接隣接領域の酸化量と回り止め部の酸化量との差分値である。 The front end surface of the cushioning body and the outer peripheral surface of the cushioning body include a welding adjacent region adjacent to the welding fixing portion. The rear end surface of the buffer body portion includes only a low oxidation region in which the oxidation amount is smaller than the oxidation amount in the welding adjacent region. The amount of oxidation in the low oxidation region is less than the first determination reference value. The first determination reference value is a value obtained by subtracting the value corresponding to the first specific ratio from the amount of oxidation in the area adjacent to the weld. The first specific ratio equivalent value is a value equivalent to 50% with respect to the oxidation amount difference value. The oxidation amount difference value is a difference value between the oxidation amount of the welding adjacent region and the oxidation amount of the detent portion.

このセンサは、緩衝本体部の外表面のうち先端面および外周面には、溶接隣接領域が存在するが、緩衝本体部の外表面のうち後端面には、低酸化領域のみが存在し、溶接隣接領域が存在しないように構成されている。緩衝部(緩衝本体部)の外表面は、酸化量が大きいほど摩擦係数が大きい粗い表面状態(粗い表面状態)となり、酸化量が小さいほど摩擦係数が小さい表面状態(滑らかな表面状態)となる。 In this sensor, welding adjacent regions exist on the front end surface and the outer peripheral surface of the outer surface of the buffer body, but only a low oxidation region exists on the rear end surface of the outer surface of the buffer body, and welding is performed. It is configured so that there are no adjacent areas. The outer surface of the buffer portion (buffer body portion) has a rough surface state (coarse surface state) in which the friction coefficient is large as the amount of oxidation is large, and a surface state (smooth surface state) in which the friction coefficient is small as the amount of oxidation is small. ..

このように、緩衝本体部の後端面に溶接隣接領域が存在しない構成であれば、緩衝本体部の後端面と螺合挟持部との間の摩擦力の増大を抑制できるため、螺合挟持部の螺合作業時に生じる摩擦力によって緩衝部の回り止め部が破損することを抑制できる。これにより、螺合挟持部の螺合作業時における緩衝部の回転を抑制でき、センサの回転も抑制できるため、センサの位置ズレを抑制できる。 In this way, if there is no welding adjacent region on the rear end surface of the buffer body, the increase in frictional force between the rear end surface of the buffer body and the screw pinch can be suppressed, so that the screw pinch It is possible to prevent the detent portion of the cushioning portion from being damaged by the frictional force generated during the screwing operation. As a result, the rotation of the cushioning portion during the screwing operation of the screw holding portion can be suppressed, and the rotation of the sensor can also be suppressed, so that the displacement of the sensor can be suppressed.

よって、このセンサによれば、螺合挟持部の螺合作業時におけるセンサの位置ズレを抑制できるため、センサ固定部に対するセンサ自身の回転方向位置を容易に特定できる。
なお、溶接隣接領域の酸化量は、例えば、エネルギー分散型X線分析(EDS分析)を用いた定量分析結果が4.0質量%以上となるように設定してもよい。また、回り止め部の酸化量は、例えば、EDS分析を用いた定量分析結果が2.0質量%以下となるように設定してもよい。
Therefore, according to this sensor, it is possible to suppress the displacement of the sensor during the screwing operation of the screw holding portion, so that the position of the sensor itself in the rotation direction with respect to the sensor fixing portion can be easily specified.
The amount of oxidation in the region adjacent to the weld may be set so that the quantitative analysis result using the energy dispersive X-ray analysis (EDS analysis) is 4.0% by mass or more. Further, the oxidation amount of the detent portion may be set so that the quantitative analysis result using the EDS analysis is 2.0% by mass or less, for example.

次に、上記のセンサにおいては、低酸化領域の酸化量は、第1判定基準値未満であるとともに、第2判定基準値未満であってもよい。第2判定基準値は、溶接隣接領域の酸化量から第2特定割合相当値を差し引いた値である。第2特定割合相当値は、酸化量差分値に対する90%相当値である。 Next, in the above sensor, the amount of oxidation in the low oxidation region may be less than the first determination reference value and less than the second determination reference value. The second determination reference value is a value obtained by subtracting the value corresponding to the second specific ratio from the amount of oxidation in the area adjacent to the weld. The second specific ratio equivalent value is a value equivalent to 90% with respect to the oxidation amount difference value.

このような低酸化領域は、より一層摩擦係数が小さくなるため、緩衝本体部の後端面と螺合挟持部との間の摩擦力の増大をより一層抑制できる。 In such a low oxidation region, the coefficient of friction is further reduced, so that an increase in frictional force between the rear end surface of the buffer body portion and the screw holding portion can be further suppressed.

温度センサの一部破断縦断面図である。It is a partially broken vertical sectional view of a temperature sensor. 図1のII−II線における温度センサの断面図である。It is sectional drawing of the temperature sensor in line II-II of FIG. 緩衝部および環状押圧部を溶接した溶接部の説明図である。It is explanatory drawing of the welded part which welded the cushioning part and the annular pressing part. 排気管の取付穴に対して温度センサを取り付ける取付作業の途中状態を表す説明図である。It is explanatory drawing which shows the intermediate state of the mounting work which mounts a temperature sensor with respect to the mounting hole of an exhaust pipe. 排気管の取付穴に温度センサが取り付けられた状態を表す説明図である。It is explanatory drawing which shows the state which the temperature sensor is attached to the attachment hole of the exhaust pipe. 図5のVI−VI線における温度センサおよび排気管の取付け対象部位の断面図である。It is sectional drawing of the attachment target part of the temperature sensor and the exhaust pipe in the VI-VI line of FIG. 緩衝部の各部における酸化量の分析結果を示す説明図である。It is explanatory drawing which shows the analysis result of the amount of oxidation in each part of a buffer part.

以下、本開示が適用された実施形態について、図面を用いて説明する。
尚、本開示は、以下の実施形態に何ら限定されるものではなく、本開示の技術的範囲に属する限り種々の形態を採り得ることはいうまでもない。
Hereinafter, embodiments to which the present disclosure has been applied will be described with reference to the drawings.
It should be noted that the present disclosure is not limited to the following embodiments, and it goes without saying that various forms can be adopted as long as they belong to the technical scope of the present disclosure.

[1.第1実施形態]
[1−1.全体構成]
第1実施形態として、エンジンの排気ガスの温度を測定する温度センサ101について説明する。
[1. First Embodiment]
[1-1. overall structure]
As the first embodiment, the temperature sensor 101 for measuring the temperature of the exhaust gas of the engine will be described.

図1〜図6に示すように、温度センサ101は、排気管500(排気マニホールド500ともいう)のセンサ固定部501(ボス501)に設けられた取付穴503に対して、螺合により取付け可能に構成されている。 As shown in FIGS. 1 to 6, the temperature sensor 101 can be screwed into a mounting hole 503 provided in the sensor fixing portion 501 (boss 501) of the exhaust pipe 500 (also referred to as an exhaust manifold 500). It is configured in.

図1に示すように、温度センサ101は、チューブ11と、センサ素子21と、を備えて構成されている。チューブ11は、SUS310製で、先端(図示下端)が閉じられてなる横断面円形の部材である。センサ素子21は、チューブ11の内部のうち先端又は先端寄り部位に配置されている。 As shown in FIG. 1, the temperature sensor 101 includes a tube 11 and a sensor element 21. The tube 11 is made of SUS310 and is a member having a circular cross section with its tip (lower end in the drawing) closed. The sensor element 21 is arranged at the tip or a portion near the tip inside the tube 11.

チューブ11は、軸線方向(軸線Gに沿った方向)に延びる長尺形状に形成されて、軸線方向の先端側に検知部を有するセンサ本体部として備えられている。センサ素子21は、排気管500の内部を流通する排気ガスのガス温度を状態量として検出する検知部であり、詳細には温度変化に応じて抵抗値が変化するサーミスタ部を備える。 The tube 11 is formed in an elongated shape extending in the axial direction (direction along the axis G), and is provided as a sensor main body portion having a detection unit on the tip end side in the axial direction. The sensor element 21 is a detection unit that detects the gas temperature of the exhaust gas flowing inside the exhaust pipe 500 as a state quantity, and specifically includes a thermistor unit whose resistance value changes in response to a temperature change.

チューブ11には、開口端から挿入された長尺形状のシース管25が配置されている。シース管25は、自身の内部に、長手方向に挿通された2本の芯線24と、2本の芯線24の周囲に充填された絶縁粉末と、を備える。2本の芯線24は、それぞれ、シース管25の先端および後端からシース管25の外部に突出する状態で配置されている。 A long sheath tube 25 inserted from the open end is arranged in the tube 11. The sheath tube 25 includes, inside itself, two core wires 24 inserted in the longitudinal direction and an insulating powder filled around the two core wires 24. The two core wires 24 are arranged so as to project from the front end and the rear end of the sheath tube 25 to the outside of the sheath tube 25, respectively.

センサ素子21は、温度変化に応じて変化する出力を外部に取り出すため、自身の後方から延びる2本の電極線23を備えている。2本の電極線23は、それぞれ、2本の芯線24の先端部と電気的に接続されている。つまり、センサ素子21は、チューブ11の内部のうち、シース管25の先端側に配置されている。 The sensor element 21 includes two electrode wires 23 extending from the rear of the sensor element 21 in order to take out an output that changes in response to a temperature change to the outside. The two electrode wires 23 are electrically connected to the tips of the two core wires 24, respectively. That is, the sensor element 21 is arranged on the tip end side of the sheath tube 25 inside the tube 11.

なお、チューブ11の先端寄り部位は、その内部においてシース管25の先端と当接するように細く縮径される形状であり、チューブ11のうちシース管25を内挿する部位より径寸法が小さい形状である。そして、チューブ11の先端寄り部位には、センサ素子21の揺動を抑制するために、セメント(図示省略)が充填されている。 The portion of the tube 11 near the tip has a shape in which the diameter is reduced so as to abut the tip of the sheath tube 25 inside the tube 11, and the diameter of the tube 11 is smaller than that of the portion in which the sheath tube 25 is inserted. Is. The portion of the tube 11 near the tip is filled with cement (not shown) in order to suppress the swing of the sensor element 21.

チューブ11の後端寄り部位の外周には、環状押圧部31が配置されている。環状押圧部31は、取付穴503の奥(先端側)に形成された気密保持用の環状座面505(図4または図5参照)に当接するために備えられている。 An annular pressing portion 31 is arranged on the outer circumference of the portion near the rear end of the tube 11. The annular pressing portion 31 is provided to abut the annular seat surface 505 (see FIG. 4 or FIG. 5) for maintaining airtightness formed in the back (tip side) of the mounting hole 503.

環状押圧部31は、オーステナイト系のステンレス鋼であるSUS310製で、チューブ11の中心軸(軸線G)方向から見て(先端側から見て)円形で環状に形成されている。環状押圧部31は、フランジ部32と、筒状部33と、を備える。フランジ部32は、環状押圧部31の先端側において、チューブ11の径方向外向きに突出するように形成されている。筒状部33は、環状押圧部31の後端側において、内径がフランジ部32と同一寸法で、外径がフランジ部32よりも小さい寸法の円筒状に形成されている。 The annular pressing portion 31 is made of SUS310, which is an austenitic stainless steel, and is formed in a circular shape (viewed from the tip side) when viewed from the central axis (axis G) direction of the tube 11. The annular pressing portion 31 includes a flange portion 32 and a tubular portion 33. The flange portion 32 is formed so as to project outward in the radial direction of the tube 11 on the tip end side of the annular pressing portion 31. The tubular portion 33 is formed on the rear end side of the annular pressing portion 31 in a cylindrical shape having the same inner diameter as the flange portion 32 and a smaller outer diameter than the flange portion 32.

環状押圧部31は、筒状部33の内周面を介してチューブ11の後端寄り部位の外周面に圧入された後、さらにレーザー溶接によりチューブ11に固定されている。
環状押圧部31は、後端方向面35と、先端方向面36と、外周面37と、を備える。後端方向面35は、チューブ11の中心軸(軸線G)に垂直な面であり、円形環状である。先端方向面36は、先端側にかけて径方向寸法が小さくなるテーパ形状のテーパ面を備えており、環状座面505に当接するように形成されている。外周面37は、外径寸法が取付穴503の内径寸法より小さい円筒面として形成されている。
The annular pressing portion 31 is press-fitted into the outer peripheral surface of the portion near the rear end of the tube 11 via the inner peripheral surface of the tubular portion 33, and then is further fixed to the tube 11 by laser welding.
The annular pressing portion 31 includes a rear end direction surface 35, a front end direction surface 36, and an outer peripheral surface 37. The rear end direction surface 35 is a surface perpendicular to the central axis (axis G) of the tube 11 and has a circular ring shape. The tip direction surface 36 is provided with a tapered surface having a tapered shape whose radial dimension becomes smaller toward the tip side, and is formed so as to abut on the annular seat surface 505. The outer peripheral surface 37 is formed as a cylindrical surface whose outer diameter dimension is smaller than the inner diameter dimension of the mounting hole 503.

温度センサ101は、大径チューブ41(保護管41)と、弾性シール部47と、2本の電線28と、を備えている。
大径チューブ41は、チューブ11およびシース管25よりも径寸法が大きい横断面円形の筒状に形成されている。大径チューブ41は、中心軸(軸線G)がチューブ11の中心軸と重なる状態で、筒状部33の外周面に固定されている。大径チューブ41は、自身の先端部が筒状部33の外周面に外嵌されるとともに後端方向面35に当接した状態で、筒状部33の外周面にレーザー溶接により固定されている。
The temperature sensor 101 includes a large-diameter tube 41 (protective tube 41), an elastic seal portion 47, and two electric wires 28.
The large-diameter tube 41 is formed in a tubular shape having a circular cross section having a larger diameter than the tube 11 and the sheath tube 25. The large-diameter tube 41 is fixed to the outer peripheral surface of the tubular portion 33 in a state where the central axis (axis G) overlaps the central axis of the tube 11. The large-diameter tube 41 is fixed to the outer peripheral surface of the tubular portion 33 by laser welding with its tip end fitted on the outer peripheral surface of the tubular portion 33 and in contact with the rear end direction surface 35. There is.

シース管25は、自身の後端が大径チューブ41の長手方向における中間部位に位置するように配置されている。2本の芯線24は、シース管25の後端から引き出された端部が、カシメ端子27を介して、電気信号取り出し用の2本の電線28(リード線28)と電気的に接続されている。2本の電線28は、大径チューブ41の後端から外部に引き出されている。 The sheath tube 25 is arranged so that its rear end is located at an intermediate portion in the longitudinal direction of the large diameter tube 41. The ends of the two core wires 24 drawn from the rear end of the sheath tube 25 are electrically connected to the two electric wires 28 (lead wires 28) for taking out electric signals via the caulking terminal 27. There is. The two electric wires 28 are drawn out from the rear end of the large diameter tube 41.

弾性シール部47は、大径チューブ41の後端部45の内部に配置されている。2本の電線28は、弾性シール部47の内部を貫通して、大径チューブ41から外部に引き出されている。大径チューブ41は、後端部45が縮径状に加締められた状態で、弾性シール部47を保持すると共に、2本の電線28を固定している。 The elastic seal portion 47 is arranged inside the rear end portion 45 of the large diameter tube 41. The two electric wires 28 penetrate the inside of the elastic seal portion 47 and are pulled out from the large diameter tube 41 to the outside. The large-diameter tube 41 holds the elastic seal portion 47 and fixes the two electric wires 28 in a state where the rear end portion 45 is crimped in a reduced diameter shape.

温度センサ101は、環状押圧部31の後端方向面35の後端側(図1における上方)に配置された緩衝部51を備えている。緩衝部51の構成については、後述する。
温度センサ101は、固定部材61を備えている。
The temperature sensor 101 includes a buffer portion 51 arranged on the rear end side (upper side in FIG. 1) of the rear end direction surface 35 of the annular pressing portion 31. The configuration of the shock absorber 51 will be described later.
The temperature sensor 101 includes a fixing member 61.

固定部材61は、オーステナイト系のステンレス鋼であるSUS303またはSUSXM7製であり、内径が大径チューブ41の外径より大きい筒状部60を有している。固定部材61は、緩衝部51の後端側において、大径チューブ41の外側に遊嵌状に配置されている。固定部材61は、自身の先端63が、緩衝部51の後端面57に当接するように配置されている。固定部材61は、筒状部60の外周面に、取付穴503に螺合可能なネジ部62を備えている。固定部材61の後端の外周には、螺合作業用の多角形部67が形成されている。固定部材61は、センサ固定部501の取付穴503に形成された環状座面505との間で環状押圧部31(詳細には、フランジ部32)を挟持するよう構成されている。 The fixing member 61 is made of austenitic stainless steel SUS303 or SUSXM7, and has a tubular portion 60 having an inner diameter larger than the outer diameter of the large diameter tube 41. The fixing member 61 is loosely fitted to the outside of the large diameter tube 41 on the rear end side of the cushioning portion 51. The fixing member 61 is arranged so that its tip 63 abuts on the rear end surface 57 of the cushioning portion 51. The fixing member 61 is provided with a screw portion 62 that can be screwed into the mounting hole 503 on the outer peripheral surface of the tubular portion 60. A polygonal portion 67 for screwing work is formed on the outer periphery of the rear end of the fixing member 61. The fixing member 61 is configured to sandwich the annular pressing portion 31 (specifically, the flange portion 32) with the annular seat surface 505 formed in the mounting hole 503 of the sensor fixing portion 501.

[1−2.緩衝部]
緩衝部51は、環状押圧部31(詳細には、フランジ部32)と固定部材61との間に配置される。
[1-2. Buffer]
The buffer portion 51 is arranged between the annular pressing portion 31 (specifically, the flange portion 32) and the fixing member 61.

緩衝部51は、オーステナイト系のステンレス鋼であるSUS304製であり、厚さ寸法が1.5mmの板形状をなしている。図2および図3に示すように、緩衝部51は、本体部51aと、回り止め部51bと、を備えている。なお、図2では、緩衝部51の先端面に相当する位置での温度センサ101の断面図を表している。 The cushioning portion 51 is made of SUS304, which is an austenitic stainless steel, and has a plate shape with a thickness dimension of 1.5 mm. As shown in FIGS. 2 and 3, the buffer portion 51 includes a main body portion 51a and a detent portion 51b. Note that FIG. 2 shows a cross-sectional view of the temperature sensor 101 at a position corresponding to the tip surface of the buffer portion 51.

本体部51aは、環状形状のうち周方向の一部が取り除かれた円弧形状に形成されている。本体部51aは、円弧形状の内径が大径チューブ41の外径より大きく、円弧形状の外径が取付穴503の内径(ネジ溝503aの内径)より小さい形状で形成されている。回り止め部51bは、本体部51aの外周面から径方向外側に突出する形態で形成されている。 The main body portion 51a is formed in an arc shape in which a part of the annular shape in the circumferential direction is removed. The main body 51a is formed so that the inner diameter of the arc shape is larger than the outer diameter of the large-diameter tube 41 and the outer diameter of the arc shape is smaller than the inner diameter of the mounting hole 503 (inner diameter of the screw groove 503a). The detent portion 51b is formed so as to project outward in the radial direction from the outer peripheral surface of the main body portion 51a.

緩衝部51は、図3に示すように、溶接部59により環状押圧部31と一体となる状態で固定されている。溶接部59は、図2に示すように、緩衝部51の本体部51aのうち周方向における2カ所に形成されている。本実施形態では、溶接部59は、緩衝部51と環状押圧部31とを互いに積層した状態で両者の境界部分をレーザー溶接することで形成される。 As shown in FIG. 3, the buffer portion 51 is fixed by the welded portion 59 in a state of being integrated with the annular pressing portion 31. As shown in FIG. 2, the welded portions 59 are formed at two locations in the circumferential direction of the main body portion 51a of the cushioning portion 51. In the present embodiment, the welded portion 59 is formed by laser welding the boundary portion between the buffer portion 51 and the annular pressing portion 31 in a state of being laminated on each other.

緩衝部51は、外表面として、先端面56と、後端面57と、側面58と、を備える。側面58は、図2に示す円弧領域C1のうち、径方向外側に形成される外周側面58aと、径方向内側に形成される内周側面58bと、を備える。つまり、緩衝部51は、環状押圧部31(詳細には、フランジ部32)に当接する先端面56と、固定部材61に当接する後端面57と、を備えている。 The cushioning portion 51 includes a front end surface 56, a rear end surface 57, and a side surface 58 as an outer surface. The side surface 58 includes an outer peripheral side surface 58a formed on the outer side in the radial direction and an inner peripheral side surface 58b formed on the inner side in the radial direction in the arc region C1 shown in FIG. That is, the cushioning portion 51 includes a front end surface 56 that abuts on the annular pressing portion 31 (specifically, the flange portion 32) and a rear end surface 57 that abuts on the fixing member 61.

また、緩衝部51は、外表面において、熱により表面状態が変化した熱焼け領域51cと、熱による表面状態の変化が生じていない通常領域51dと、を備える。
緩衝部51は、先端面56および側面58(特に、外周側面58a)には少なくとも熱焼け領域51cを備え、後端面57には通常領域51dのみを備える。つまり、熱焼け領域51cは、緩衝部51の外表面のうち溶接部59に隣接する領域に少なくとも形成されている。
Further, the buffer portion 51 includes a heat-burned region 51c whose surface state has changed due to heat and a normal region 51d whose surface state has not changed due to heat on the outer surface.
The buffer portion 51 includes at least a heat-burned region 51c on the front end surface 56 and the side surface 58 (particularly, the outer peripheral side surface 58a), and has only a normal region 51d on the rear end surface 57. That is, the heat-burned region 51c is formed at least in the region of the outer surface of the buffer portion 51 adjacent to the welded portion 59.

外周側面58aにおいては、熱焼け領域51cは、溶接部59に隣接する領域、あるいは先端面56との境界領域に形成されており、後端面57との境界領域には形成されていない。外周側面58aのうち後端面57との境界領域には、通常領域51dのみが形成されている。 On the outer peripheral side surface 58a, the heat-burned region 51c is formed in a region adjacent to the welded portion 59 or a boundary region with the front end surface 56, and is not formed in the boundary region with the rear end surface 57. Only the normal region 51d is formed in the boundary region of the outer peripheral side surface 58a with the rear end surface 57.

先端面56においては、図2に示すように、熱焼け領域51cは、溶接部59に隣接する領域、あるいは、外周側面58aとの境界領域に形成されており、内周側面58bとの境界領域には形成されていない。先端面56のうち内周側面58bとの境界領域には、通常領域51dのみが形成されている。 On the tip surface 56, as shown in FIG. 2, the heat-burned region 51c is formed in a region adjacent to the welded portion 59 or a boundary region with the outer peripheral side surface 58a, and is a boundary region with the inner peripheral side surface 58b. Is not formed in. Only the normal region 51d is formed in the boundary region of the tip surface 56 with the inner peripheral side surface 58b.

図示は省略するが、後端面57においては、上述したように、通常領域51dのみが形成されており、熱焼け領域51cは形成されていない。
溶接部59の形成工程においては、熱焼け領域51cの形成領域が上記の領域となるように、溶接条件(溶接温度および溶接時間)が設定されている。例えば、複数の溶接条件について溶接部形成工程を実際に行い、各溶接条件で形成された熱焼け領域51cの大きさを測定して、溶接条件と熱焼け領域51cの大きさとの相関関係を得ておき、その相関関係に基づいて熱焼け領域51cが適切に形成される溶接条件を設定してもよい。
Although not shown, in the rear end surface 57, as described above, only the normal region 51d is formed, and the heat-burned region 51c is not formed.
In the forming step of the welded portion 59, welding conditions (welding temperature and welding time) are set so that the forming region of the heat-burning region 51c becomes the above-mentioned region. For example, a welded portion forming step is actually performed for a plurality of welding conditions, and the size of the heat-burned region 51c formed under each welding condition is measured to obtain a correlation between the welding condition and the size of the heat-burned region 51c. In addition, welding conditions may be set in which the heat-burning region 51c is appropriately formed based on the correlation.

また、図2および図3に示すように、回り止め部51bは、熱焼け領域51cおよび溶接部59から離れた位置に形成されている。さらに、環状押圧部31の外周面37には、溶接部59に隣接する領域に、熱により表面状態が変化した熱焼け領域37aが形成されている。 Further, as shown in FIGS. 2 and 3, the detent portion 51b is formed at a position away from the heat-burning region 51c and the welded portion 59. Further, on the outer peripheral surface 37 of the annular pressing portion 31, a heat-burned region 37a whose surface state has been changed by heat is formed in a region adjacent to the welded portion 59.

[1−3.取付穴に対する温度センサの取付方法]
温度センサ101は、排気管500に形成された取付穴503に次のようにして取付けられる。
[1-3. How to mount the temperature sensor on the mounting hole]
The temperature sensor 101 is mounted in the mounting hole 503 formed in the exhaust pipe 500 as follows.

まず、図4に示したように、ねじ込み用の固定部材61を温度センサ101の後方にスライドさせた状態で、取付穴503に対して温度センサ101を先端側から挿入する。図4では、溶接部59の図示を省略しているが、緩衝部は、溶接部59により環状押圧部31に固定されている。 First, as shown in FIG. 4, the temperature sensor 101 is inserted into the mounting hole 503 from the tip side in a state where the fixing member 61 for screwing is slid to the rear of the temperature sensor 101. Although the welded portion 59 is not shown in FIG. 4, the buffer portion is fixed to the annular pressing portion 31 by the welded portion 59.

取付穴503は、ネジ溝503aと、位置決め部503bと、を備えている。ネジ溝503aは、固定部材61のネジ部62と螺合可能なネジ溝であり、取付穴503の内面のうち開口端部(後端部)から環状座面505よりも後端側の所定位置にかけて形成されている。位置決め部503bは、取付穴503の内面のうち周方向の特定位置において、回り止め部51bを配置可能な大きさの空間を有するとともに、温度センサ101が回転したときに回り止め部51bに当接する内壁面を備えて形成されている。位置決め部503bは、内壁面が回り止め部51bに当接することで、緩衝部51の回転移動範囲を制限するように形成されている。 The mounting hole 503 includes a screw groove 503a and a positioning portion 503b. The screw groove 503a is a screw groove that can be screwed with the screw portion 62 of the fixing member 61, and is a predetermined position on the inner surface of the mounting hole 503 from the open end portion (rear end portion) to the rear end side of the annular seat surface 505. It is formed over. The positioning portion 503b has a space large enough to arrange the detent portion 51b at a specific position in the circumferential direction on the inner surface of the mounting hole 503, and abuts on the detent portion 51b when the temperature sensor 101 rotates. It is formed with an inner wall surface. The positioning portion 503b is formed so that the inner wall surface abuts on the detent portion 51b to limit the rotational movement range of the cushioning portion 51.

取付穴503への温度センサ101の挿入作業時には、図6に示すように、緩衝部51の回り止め部51bが取付穴503の位置決め部503bに配置される。これにより、取付穴503に対する温度センサ101の相対位置(特に、周方向の相対位置)を特定位置に設定できる。 At the time of inserting the temperature sensor 101 into the mounting hole 503, as shown in FIG. 6, the detent portion 51b of the buffer portion 51 is arranged in the positioning portion 503b of the mounting hole 503. Thereby, the relative position (particularly, the relative position in the circumferential direction) of the temperature sensor 101 with respect to the mounting hole 503 can be set to a specific position.

そして、取付穴503の環状座面505に環状押圧部31の先端方向面36が当接するまで温度センサ101を取付穴503に挿入し、そのあと、固定部材61を取付穴503に対して所定の締め付けトルクでねじ込むことで螺合作業を行う。図5に示したように、この螺合作業によって環状押圧部31は、緩衝部51を介して環状座面505に押付けられて、環状座面505との間で気密性を保持した状態で取付穴503に取付けられる。 Then, the temperature sensor 101 is inserted into the mounting hole 503 until the tip direction surface 36 of the annular pressing portion 31 comes into contact with the annular seat surface 505 of the mounting hole 503, and then the fixing member 61 is inserted into the mounting hole 503. Screwing work is performed by screwing in with the tightening torque. As shown in FIG. 5, the annular pressing portion 31 is pressed against the annular seat surface 505 via the cushioning portion 51 by this screwing operation, and is attached in a state of maintaining airtightness with the annular seat surface 505. It is attached to hole 503.

この螺合作業時には、緩衝部51の後端面57は、固定部材61の先端面と直接接触しており、緩衝部51と固定部材61との間に摩擦力が生じる。
ここで、緩衝部51の後端面57には、熱焼け領域51cは形成されておらず、通常領域51dのみが形成されている。通常領域51dは、熱焼け領域51cに比べて、表面の摩擦係数が小さいことから、螺合作業時に緩衝部51と固定部材61との間に生じる摩擦力が過剰に大きくなることを抑制できる。
During this screwing operation, the rear end surface 57 of the cushioning portion 51 is in direct contact with the tip surface of the fixing member 61, and a frictional force is generated between the cushioning portion 51 and the fixing member 61.
Here, the heat-burning region 51c is not formed on the rear end surface 57 of the buffer portion 51, and only the normal region 51d is formed. Since the surface friction coefficient of the normal region 51d is smaller than that of the heat-burning region 51c, it is possible to prevent the frictional force generated between the cushioning portion 51 and the fixing member 61 from becoming excessively large during the screwing operation.

[1−4.緩衝部の分析結果]
次に、緩衝部51の表面状態を分析した結果について説明する。
本分析では、緩衝部51の表面状態として表面の酸化量を分析した。具体的には、エネルギー分散型X線分析(EDS分析)を用いた定量分析により、緩衝部51の表面における酸素含有量[質量%]を分析した。
[1-4. Buffer analysis results]
Next, the result of analyzing the surface state of the buffer portion 51 will be described.
In this analysis, the amount of oxidation on the surface was analyzed as the surface state of the buffer portion 51. Specifically, the oxygen content [mass%] on the surface of the buffer 51 was analyzed by quantitative analysis using energy dispersive X-ray analysis (EDS analysis).

本分析では、測定倍率を90倍とし、加速電圧を15kVとして、EDS分析を実施した。図7に示すように、緩衝部51のうち、本体部51aの後端面57、回り止め部51bの先端面56、本体部51aの先端面56の熱焼け領域51c(以下、溶接隣接領域51cともいう)の3個の領域について、EDS分析を実施した。なお、3個の領域それぞれについて複数箇所(本分析では5箇所)の分析を行い、複数箇所の酸素含有量における平均値を分析結果として図7に示す。また、分析結果として、酸素含有量の他に、鉄(Fe)、クロム(Cr)、ニッケル(Ni)のそれぞれの含有量(平均値)を示すとともに、複数箇所で検出された各成分の標準偏差を示した。 In this analysis, EDS analysis was performed with a measurement magnification of 90 times and an accelerating voltage of 15 kV. As shown in FIG. 7, among the buffer portions 51, the heat-burned region 51c of the rear end surface 57 of the main body portion 51a, the tip surface 56 of the detent portion 51b, and the tip surface 56 of the main body portion 51a (hereinafter, also referred to as a welding adjacent region 51c) EDS analysis was performed on the three regions (referred to as). In addition, analysis was performed at a plurality of locations (5 locations in this analysis) for each of the three regions, and the average value of the oxygen content at the plurality of locations is shown in FIG. 7 as the analysis result. In addition to the oxygen content, the analysis results show the contents (mean values) of iron (Fe), chromium (Cr), and nickel (Ni), as well as the standard of each component detected at a plurality of locations. The deviation was shown.

この分析結果によれば、本体部51aの後端面57の酸化量M1(=1.1[質量%])は、緩衝部51のうち溶接隣接領域51cの酸化量M2(=5.4[質量%])に比べて、小さいことが分かる。また、本体部51aの後端面57の酸化量M1は、回り止め部51bの先端面56の酸化量M3(=1.1[質量%])と同等である。また、3個の領域はいずれも酸素含有量の標準偏差は0であるため、3個の領域は、各領域内の複数箇所における酸素含有量のバラツキが低いことが分かる。 According to this analysis result, the oxidation amount M1 (= 1.1 [mass%]) of the rear end surface 57 of the main body 51a is the oxidation amount M2 (= 5.4 [mass]) of the welding adjacent region 51c of the buffer portion 51. %]), It can be seen that it is smaller. Further, the oxidation amount M1 of the rear end surface 57 of the main body portion 51a is equivalent to the oxidation amount M3 (= 1.1 [mass%]) of the front end surface 56 of the detent portion 51b. Further, since the standard deviation of the oxygen content in each of the three regions is 0, it can be seen that the variation in the oxygen content in the three regions at a plurality of locations in each region is low.

本体部51aの後端面57は、溶接隣接領域51cの酸化量M2よりも酸化量が小さい低酸化領域51eのみを備える。低酸化領域51eの酸化量M1は、溶接隣接領域51cの酸化量M2と回り止め部51bの酸化量M3との差分値(=M2−M3。以下、酸化量差分値ともいう)の特定割合相当値Va(=(M2−M3)×Ra)(Ra:特定割合)を、溶接隣接領域51cの酸化量M2から差し引いた数値M4(=M2−Va)未満である。なお、本実施形態における特定割合Raは50%であるため、数値M4は3.25[質量%](=5.40−(5.40−1.10)×0.5)である。このように、低酸化領域51eの酸化量M1(=1.1[質量%])は、数値M4(=3.25[質量%])未満である(M1<M4)。 The rear end surface 57 of the main body 51a includes only a low oxidation region 51e whose oxidation amount is smaller than the oxidation amount M2 of the welding adjacent region 51c. The oxidation amount M1 of the low oxidation region 51e corresponds to a specific ratio of the difference value (= M2-M3, hereinafter also referred to as the oxidation amount difference value) between the oxidation amount M2 of the welding adjacent region 51c and the oxidation amount M3 of the detent portion 51b. The value Va (= (M2-M3) × Ra) (Ra: specific ratio) is less than the numerical value M4 (= M2-Va) obtained by subtracting the oxidation amount M2 of the welding adjacent region 51c from the oxidation amount M2. Since the specific ratio Ra in this embodiment is 50%, the numerical value M4 is 3.25 [mass%] (= 5.40- (5.40-1.10) × 0.5). As described above, the oxidation amount M1 (= 1.1 [mass%]) of the low oxidation region 51e is less than the numerical value M4 (= 3.25 [mass%]) (M1 <M4).

つまり、温度センサ101の緩衝部51は、本体部51aの外表面のうち先端面56および側面58(特に、外周側面58a)には、溶接隣接領域51c(熱焼け領域51c)が存在するが、本体部51aの外表面のうち後端面57には、低酸化領域51eのみが存在し、溶接隣接領域51cが存在しないように構成されている。 That is, the buffer portion 51 of the temperature sensor 101 has a welding adjacent region 51c (heat burn region 51c) on the tip surface 56 and the side surface 58 (particularly, the outer peripheral side surface 58a) of the outer surface of the main body portion 51a. Of the outer surface of the main body 51a, the rear end surface 57 is configured so that only the low oxidation region 51e exists and the welding adjacent region 51c does not exist.

緩衝部51(本体部51a)の外表面は、酸化量が大きいほど摩擦係数が大きい表面状態(粗い表面状態)となり、酸化量が小さいほど摩擦係数が小さい表面状態(滑らかな表面状態)となる。緩衝部51は、本体部51aの後端面57に溶接隣接領域51cが存在しない構成であるため、本体部51aの後端面57と固定部材61との間の摩擦力の増大を抑制できる。 The outer surface of the buffer portion 51 (main body portion 51a) has a surface state (coarse surface state) in which the friction coefficient is large as the amount of oxidation is large, and a surface state (smooth surface state) in which the friction coefficient is small as the amount of oxidation is small. .. Since the cushioning portion 51 has a configuration in which the welding adjacent region 51c does not exist on the rear end surface 57 of the main body 51a, it is possible to suppress an increase in the frictional force between the rear end surface 57 of the main body 51a and the fixing member 61.

なお、特定割合Raが70%である場合には、数値M4は2.39[質量%](=5.40−(5.40−1.10)×0.7)であり、特定割合Raが90%である場合には、数値M4は1.53[質量%](=5.40−(5.40−1.10)×0.9)である。本実施形態における低酸化領域51eの酸化量M1(=1.1[質量%])は、特定割合Raが50%の場合の数値M4(=3.25[質量%])未満という条件のみならず、特定割合Raが90%の場合の数値M4(=1.53[質量%])未満であるという条件も満たしている。このように、特定割合Raがより大きい値である場合にも、「酸化量M1が数値M4未満という条件」を満たす場合には、低酸化領域51eはより一層摩擦係数が小さくなる。このため、本実施形態の温度センサ101は、本体部51aの後端面57と固定部材61との間の摩擦力の増大をより一層抑制できる。 When the specific ratio Ra is 70%, the numerical value M4 is 2.39 [mass%] (= 5.40- (5.40-1.10) × 0.7), and the specific ratio Ra. When is 90%, the numerical value M4 is 1.53 [mass%] (= 5.40- (5.40-1.10) × 0.9). If the oxidation amount M1 (= 1.1 [mass%]) of the low oxidation region 51e in the present embodiment is less than the numerical value M4 (= 3.25 [mass%]) when the specific ratio Ra is 50%. However, it also satisfies the condition that it is less than the numerical value M4 (= 1.53 [mass%]) when the specific ratio Ra is 90%. As described above, even when the specific ratio Ra is a larger value, the friction coefficient of the low oxidation region 51e becomes even smaller when the "condition that the oxidation amount M1 is less than the numerical value M4" is satisfied. Therefore, the temperature sensor 101 of the present embodiment can further suppress an increase in the frictional force between the rear end surface 57 of the main body 51a and the fixing member 61.

[1−5.効果]
以上説明したように、本実施形態の温度センサ101は、緩衝部51を備えている。
緩衝部51の回り止め部51bは、緩衝部51(本体部51a)の外周側面58aから径方向外側に突出する形態であって、センサ固定部501の取付穴503に形成された位置決め部503bと係合するように構成されている。緩衝部51の溶接部59は、緩衝部51の先端面56と環状押圧部31とを溶接により固定するように構成されている。
[1-5. effect]
As described above, the temperature sensor 101 of the present embodiment includes the buffer portion 51.
The detent portion 51b of the cushioning portion 51 has a form of protruding outward in the radial direction from the outer peripheral side surface 58a of the cushioning portion 51 (main body portion 51a), and has a positioning portion 503b formed in a mounting hole 503 of the sensor fixing portion 501. It is configured to engage. The welded portion 59 of the cushioning portion 51 is configured to fix the tip surface 56 of the cushioning portion 51 and the annular pressing portion 31 by welding.

また、緩衝部51は、先端面56および外周側面58aには少なくとも熱焼け領域51cを備え、後端面57には通常領域51dのみを備えるように構成されている。緩衝部51は、自身の外表面のうち先端面56および側面58(外周側面58a)には熱焼け領域51cが存在するが、自身の外表面のうち後端面57には、通常領域51dのみが存在し、熱焼け領域51cが存在しないように構成されている。 Further, the buffer portion 51 is configured so that the front end surface 56 and the outer peripheral side surface 58a are provided with at least a heat-burned region 51c, and the rear end surface 57 is provided with only a normal region 51d. The buffer portion 51 has a heat-burned region 51c on the front end surface 56 and the side surface 58 (outer peripheral side surface 58a) of its own outer surface, but only the normal region 51d is on the rear end surface 57 of its own outer surface. It exists and is configured so that the heat burn region 51c does not exist.

このように、緩衝部51の後端面57に熱焼け領域51cが存在しない構成であれば、緩衝部51の後端面57と固定部材61との間の摩擦力の増大を抑制できるため、固定部材61の螺合作業時に生じる摩擦力によって緩衝部51の回り止め部51bが破損することを抑制できる。これにより、固定部材61の螺合作業時における緩衝部51の回転を抑制でき、温度センサ101の回転も抑制できるため、温度センサ101の位置ズレを抑制できる。 As described above, if the heat-burning region 51c does not exist on the rear end surface 57 of the buffer portion 51, an increase in the frictional force between the rear end surface 57 of the buffer portion 51 and the fixing member 61 can be suppressed, so that the fixing member It is possible to prevent the detent portion 51b of the cushioning portion 51 from being damaged by the frictional force generated during the screwing operation of the 61. As a result, the rotation of the buffer portion 51 during the screwing operation of the fixing member 61 can be suppressed, and the rotation of the temperature sensor 101 can also be suppressed, so that the positional deviation of the temperature sensor 101 can be suppressed.

よって、温度センサ101によれば、固定部材61の螺合作業時における温度センサ101の位置ズレを抑制できるため、センサ固定部501に対する温度センサ101の回転方向位置を容易に特定できる。 Therefore, according to the temperature sensor 101, the position deviation of the temperature sensor 101 during the screwing operation of the fixing member 61 can be suppressed, so that the position of the temperature sensor 101 in the rotation direction with respect to the sensor fixing portion 501 can be easily specified.

次に、温度センサ101においては、環状押圧部31および緩衝部51は、オーステナイト系ステンレス鋼で形成されている。
オーステナイト系ステンレス鋼は、耐熱性に優れるため、高温環境下で温度センサ101が使用される場合にも信頼性の高いセンサを提供することができる。また、ステンレス鋼は安価であるため、溶接部59を設けることによる材料コストの大幅な増加を抑制できる。
Next, in the temperature sensor 101, the annular pressing portion 31 and the cushioning portion 51 are made of austenitic stainless steel.
Since the austenitic stainless steel has excellent heat resistance, it is possible to provide a highly reliable sensor even when the temperature sensor 101 is used in a high temperature environment. Further, since stainless steel is inexpensive, it is possible to suppress a significant increase in material cost due to the provision of the welded portion 59.

次に、温度センサ101においては、環状押圧部31、緩衝部51、固定部材61が、全てオーステナイト系ステンレス鋼で形成されている。
このように、環状押圧部31、緩衝部51、固定部材61が同一系統のステンレス鋼で形成されることで、温度センサ101を温度変化の激しい用途に用いる場合に、使用環境下において線熱膨張係数の違いによる溶接部59の破断や螺合の緩みが生じがたくなる。これにより、温度変化の激しい用途に用いる場合でも、使用環境下においてセンサ固定部501における温度センサ101の位置ズレが発生することを抑制できる。
Next, in the temperature sensor 101, the annular pressing portion 31, the cushioning portion 51, and the fixing member 61 are all made of austenitic stainless steel.
In this way, the annular pressing portion 31, the cushioning portion 51, and the fixing member 61 are made of stainless steel of the same system, so that when the temperature sensor 101 is used in an application where the temperature changes drastically, linear thermal expansion occurs in a usage environment. It becomes difficult for the welded portion 59 to break or loosen due to the difference in coefficient. As a result, even when the sensor is used in an application where the temperature changes drastically, it is possible to prevent the temperature sensor 101 from being displaced in the sensor fixing portion 501 under the usage environment.

次に、温度センサ101においては、回り止め部51bは、熱焼け領域51cおよび溶接部59から離れた位置に形成されている。
このような構成であれば、温度センサ101の製造段階において、熱の影響により回り止め部51bが変質することを抑制でき、変質により回り止め部51bの強度が低下することを抑制できる。これにより、固定部材61の螺合作業時や温度センサ101の使用環境下において、回り止め部51bの破損が生じがたくなり、センサ固定部501における温度センサ101の位置ズレが発生することを抑制できる。
Next, in the temperature sensor 101, the detent portion 51b is formed at a position away from the heat-burning region 51c and the welded portion 59.
With such a configuration, it is possible to suppress the deterioration of the detent portion 51b due to the influence of heat at the manufacturing stage of the temperature sensor 101, and it is possible to suppress the decrease in the strength of the detent portion 51b due to the deterioration. As a result, it becomes difficult for the detent portion 51b to be damaged during the screwing work of the fixing member 61 or in the usage environment of the temperature sensor 101, and it is possible to prevent the temperature sensor 101 from being displaced in the sensor fixing portion 501. it can.

また、温度センサ101の緩衝部51は、本体部51aの後端面57に溶接隣接領域51cが存在しない構成である。このように、本体部51aの後端面57に溶接隣接領域51cが存在しない構成であれば、本体部51aの後端面57と固定部材61との間の摩擦力の増大を抑制できるため、固定部材61の螺合作業時に生じる摩擦力によって緩衝部51の回り止め部51bが破損することを抑制できる。これにより、固定部材61の螺合作業時における緩衝部51の回転を抑制でき、温度センサ101の回転も抑制できるため、温度センサ101の位置ズレを抑制できる。 Further, the buffer portion 51 of the temperature sensor 101 has a configuration in which the welding adjacent region 51c does not exist on the rear end surface 57 of the main body portion 51a. As described above, if the rear end surface 57 of the main body 51a does not have the welding adjacent region 51c, an increase in the frictional force between the rear end surface 57 of the main body 51a and the fixing member 61 can be suppressed, so that the fixing member It is possible to prevent the detent portion 51b of the cushioning portion 51 from being damaged by the frictional force generated during the screwing operation of the 61. As a result, the rotation of the buffer portion 51 during the screwing operation of the fixing member 61 can be suppressed, and the rotation of the temperature sensor 101 can also be suppressed, so that the positional deviation of the temperature sensor 101 can be suppressed.

[1−6.文言の対応関係]
ここで、文言の対応関係について説明する。
温度センサ101がセンサに相当し、チューブ11およびセンサ素子21がセンサ本体部に相当し、センサ素子21が検出部に相当し、環状押圧部31のフランジ部32が鍔部に相当し、固定部材61が螺合挟持部に相当し、ネジ部62が螺合部に相当する。緩衝部51が緩衝部に相当し、本体部51aが緩衝本体部に相当し、回り止め部51bが回り止め部に相当し、溶接部59が溶接固定部に相当する。本体部51aの後端面57が低酸化領域に相当する。
[1-6. Correspondence of wording]
Here, the correspondence between words will be described.
The temperature sensor 101 corresponds to the sensor, the tube 11 and the sensor element 21 correspond to the sensor main body portion, the sensor element 21 corresponds to the detection portion, the flange portion 32 of the annular pressing portion 31 corresponds to the flange portion, and the fixing member. 61 corresponds to the screw holding portion, and the screw portion 62 corresponds to the screw portion. The buffer portion 51 corresponds to the buffer portion, the main body portion 51a corresponds to the buffer main body portion, the detent portion 51b corresponds to the detent portion, and the welded portion 59 corresponds to the weld fixing portion. The rear end surface 57 of the main body 51a corresponds to the low oxidation region.

センサ固定部501がセンサ固定部に相当し、ネジ溝503aが固定用螺合溝に相当し、位置決め部503bが位置決め部に相当する。酸化量M2と酸化量M3との差分値(=M2−M3)が酸化量差分値に相当し、特定割合相当値Vaが第1特定割合相当値に相当し、数値M4が第1判定基準値に相当する。 The sensor fixing portion 501 corresponds to the sensor fixing portion, the screw groove 503a corresponds to the fixing screw groove, and the positioning portion 503b corresponds to the positioning portion. The difference value (= M2-M3) between the oxidation amount M2 and the oxidation amount M3 corresponds to the oxidation amount difference value, the specific ratio equivalent value Va corresponds to the first specific ratio equivalent value, and the numerical value M4 corresponds to the first judgment reference value. Corresponds to.

[2.他の実施形態]
以上、本開示の実施形態について説明したが、本開示は上記実施形態に限定されるものではなく、本開示の要旨を逸脱しない範囲において、様々な態様にて実施することが可能である。
[2. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be implemented in various modes without departing from the gist of the present disclosure.

例えば、上記の第1実施形態では、温度センサ101に本開示を適用した実施形態について説明したが、温度センサに限られることはなく、ガスセンサなど他の種類のセンサであってもよい。つまり、センサが検出する状態量は、温度に限られず、ガス濃度や圧力などの他の情報であってもよい。また、温度センサとして使用する場合には、センサ素子21は、温度変化に応じて抵抗値が変化するサーミスタ部を備える構成に限られることなく、温度変化に応じて抵抗値が変化するPt抵抗体を絶縁基板上に形成した素子部を用いるようにしてもよい。 For example, in the first embodiment described above, the embodiment in which the present disclosure is applied to the temperature sensor 101 has been described, but the present invention is not limited to the temperature sensor, and other types of sensors such as a gas sensor may be used. That is, the state quantity detected by the sensor is not limited to temperature, but may be other information such as gas concentration and pressure. Further, when used as a temperature sensor, the sensor element 21 is not limited to a configuration including a thermistor portion whose resistance value changes according to a temperature change, and is a Pt resistor whose resistance value changes according to a temperature change. You may use the element part formed on the insulating substrate.

さらに、上記の第1実施形態では、温度センサ101の大径チューブ41(保護管41)がストレート形状のものを示したが、大径チューブ41が中間位置で軸線Gに対して交差する方向に屈曲する態様であってもよい。大径チューブ41が中間位置で屈曲する温度センサ101では、固定部材61のねじ込み(螺合作業)時に大径チューブ41が回転してしまうと、温度センサ101の周辺に配置される部材との緩衝を生じるため、大径チューブ41の回転を抑制することが重要となる。このような場合に、回り止め部51bが設けられた緩衝部51を備える本開示の構成が特に有用となる。 Further, in the above-described first embodiment, the large-diameter tube 41 (protection tube 41) of the temperature sensor 101 has a straight shape, but the large-diameter tube 41 intersects the axis G at an intermediate position. It may be in a bending mode. In the temperature sensor 101 in which the large-diameter tube 41 bends at an intermediate position, if the large-diameter tube 41 rotates when the fixing member 61 is screwed (screw work), buffering with a member arranged around the temperature sensor 101. Therefore, it is important to suppress the rotation of the large diameter tube 41. In such a case, the configuration of the present disclosure including the buffer portion 51 provided with the detent portion 51b becomes particularly useful.

また、上記の第1実施形態では、環状押圧部31、緩衝部51、固定部材61が全てオーステナイト系のステンレス鋼で形成された形態について説明したが、このような形態に限られることはない。オーステナイト系のステンレス鋼とフェライト系のステンレス鋼から形成される3つの部材31、51、61が混在する態様でもよく、例えば、環状押圧部31および緩衝部51はSUS310製で、固定部材61はSUS430製の態様を挙げることができる。また、環状押圧部31、緩衝部51、固定部材61が全てフェライト系のステンレス鋼で形成される態様でもよく、例えば、3つの部材31、51、61が、それぞれSUS430製の態様を挙げることができる。 Further, in the above-described first embodiment, the form in which the annular pressing portion 31, the cushioning portion 51, and the fixing member 61 are all made of austenitic stainless steel has been described, but the present invention is not limited to such a form. Three members 31, 51, 61 formed of austenitic stainless steel and ferritic stainless steel may coexist. For example, the annular pressing portion 31 and the cushioning portion 51 are made of SUS310, and the fixing member 61 is SUS430. Examples of manufacturing can be mentioned. Further, the annular pressing portion 31, the cushioning portion 51, and the fixing member 61 may all be made of ferritic stainless steel. For example, the three members 31, 51, and 61 may be made of SUS430, respectively. it can.

また、上記の第1実施形態では、本体部51aの後端面57の酸化量M1が、回り止め部51bの先端面56の酸化量M3と同一値である緩衝部51について説明したが、本開示はこのような構成に限られることはない。例えば、本体部51aの後端面57(低酸化領域51e)の酸化量M1は、溶接隣接領域51cの酸化量M2と回り止め部51bの酸化量M3との差である酸化量差分値(=M2−M3)の特定割合相当値Va(=(M2−M3)×Ra)(Ra:特定割合)を、溶接隣接領域51cの酸化量M2から差し引いた数値M4(=M2−Va)未満であってもよい。酸化量M2=5.40[質量%]、酸化量M3=1.10[質量%]、特定割合Ra=90%の場合には、特定割合相当値Va=3.87(=(5.40−1.10)×0.9)であり、数値M4=1.53(=5.40−3.87)となる。この場合、低酸化領域51eの酸化量M1が1.53[質量%]未満である緩衝部51を用いることで、緩衝部51(本体部51a)の後端面57と固定部材61との間の摩擦力の増大を抑制できる。なお、特定割合Ra=90%の場合における特定割合相当値Vaが第2特定割合相当値に相当し、特定割合Ra=90%の場合における数値M4が第2判定基準値に相当する。 Further, in the first embodiment described above, the buffer portion 51 in which the oxidation amount M1 of the rear end surface 57 of the main body portion 51a is the same value as the oxidation amount M3 of the front end surface 56 of the detent portion 51b has been described. Is not limited to such a configuration. For example, the oxidation amount M1 of the rear end surface 57 (low oxidation region 51e) of the main body portion 51a is the oxidation amount difference value (= M2) which is the difference between the oxidation amount M2 of the welding adjacent region 51c and the oxidation amount M3 of the detent portion 51b. -M3) is less than the numerical value M4 (= M2-Va) obtained by subtracting the specific ratio equivalent value Va (= (M2-M3) × Ra) (Ra: specific ratio) from the oxidation amount M2 of the welding adjacent region 51c. May be good. When the oxidation amount M2 = 5.40 [mass%], the oxidation amount M3 = 1.10 [mass%], and the specific ratio Ra = 90%, the specific ratio equivalent value Va = 3.87 (= (5.40)). -1.10) × 0.9), and the numerical value M4 = 1.53 (= 5.40-3.87). In this case, by using the cushioning portion 51 in which the oxidation amount M1 of the low oxidation region 51e is less than 1.53 [mass%], between the rear end surface 57 of the buffering portion 51 (main body portion 51a) and the fixing member 61. The increase in frictional force can be suppressed. The specific ratio equivalent value Va when the specific ratio Ra = 90% corresponds to the second specific ratio equivalent value, and the numerical value M4 when the specific ratio Ra = 90% corresponds to the second determination reference value.

さらに、上記実施形態における1つの構成要素が有する機能を複数の構成要素に分担させたり、複数の構成要素が有する機能を1つの構成要素に発揮させたりしてもよい。また、上記実施形態の構成の一部を省略してもよい。また、上記実施形態の構成の少なくとも一部を、他の実施形態の構成に対して付加、置換等してもよい。なお、特許請求の範囲に記載の文言から特定される技術思想に含まれるあらゆる態様が本開示の実施形態である。 Further, the function of one component in the above embodiment may be shared by a plurality of components, or the function of the plurality of components may be exerted by one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of another embodiment. It should be noted that all aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

11…チューブ、21…センサ素子、31…環状押圧部、32…フランジ部、33…筒状部、35…後端方向面、36…先端方向面、37…外周面、41…大径チューブ(保護管)、51…緩衝部、51a…本体部、51b…回り止め部、51c…熱焼け領域(溶接隣接領域)、51d…通常領域、51e…低酸化領域、56…先端面、57…後端面、58…側面、58a…外周側面、58b…内周側面、59…溶接部、61…固定部材、62…ネジ部、101…温度センサ、500…排気管(排気マニホールド)、501…センサ固定部(ボス)、503…取付穴、503a…ネジ溝、503b…位置決め部、505…環状座面。 11 ... tube, 21 ... sensor element, 31 ... annular pressing part, 32 ... flange part, 33 ... tubular part, 35 ... rear end direction surface, 36 ... tip direction surface, 37 ... outer peripheral surface, 41 ... large diameter tube ( Protective tube), 51 ... Buffering part, 51a ... Main body part, 51b ... Anti-rotation part, 51c ... Heat-burning area (welding adjacent area), 51d ... Normal area, 51e ... Low oxidation area, 56 ... Tip surface, 57 ... Rear End face, 58 ... side surface, 58a ... outer peripheral side surface, 58b ... inner peripheral side surface, 59 ... welded part, 61 ... fixing member, 62 ... screw part, 101 ... temperature sensor, 500 ... exhaust pipe (exhaust manifold), 501 ... sensor fixing Part (boss), 503 ... mounting hole, 503a ... screw groove, 503b ... positioning part, 505 ... annular seat surface.

Claims (6)

センサ固定部に取り付けられて状態量を検出するセンサであって、
軸線方向に延びる長尺形状に形成されて、前記軸線方向の先端側に前記状態量を検出する検知部を有するセンサ本体部と、
前記センサ本体部の外周面から径方向外側に突出して形成される鍔部と、
前記センサ固定部に形成された固定用螺合溝と螺合する螺合部を有し、前記センサ固定部との間で前記鍔部を挟持するよう構成された螺合挟持部と、
前記鍔部に当接する先端面と前記螺合挟持部に当接する後端面とを備えて、前記鍔部と前記螺合挟持部との間に配置される緩衝部と、
を備え、
前記緩衝部は、
前記緩衝部の外周面から径方向外側に突出する形態であって、前記センサ固定部に形成された位置決め部と係合するように構成された回り止め部と、
前記緩衝部の前記先端面と前記鍔部とを溶接により固定するように構成された溶接固定部と、
を備えており、
さらに、前記緩衝部は、自身の外表面に、熱により表面状態が変化した熱焼け領域と、熱による表面状態の変化が生じていない通常領域と、を備える構成であって、前記先端面および前記外周面には少なくとも前記熱焼け領域を備え、前記後端面には前記通常領域のみを備える、
センサ。
It is a sensor that is attached to the sensor fixing part to detect the state quantity.
A sensor main body that is formed in a long shape extending in the axial direction and has a detection unit that detects the state quantity on the tip side in the axial direction.
A flange portion formed so as to project radially outward from the outer peripheral surface of the sensor main body portion,
A screw holding portion having a screw portion screwed with a fixing screw groove formed in the sensor fixing portion and configured to sandwich the collar portion between the sensor fixing portion and the screw holding portion.
A buffer portion provided between the flange portion and the screw holding portion, which is provided with a front end surface that abuts on the flange portion and a rear end surface that abuts on the screw holding portion.
With
The shock absorber
A detent portion that projects radially outward from the outer peripheral surface of the cushioning portion and is configured to engage with a positioning portion formed on the sensor fixing portion.
A welded fixing portion configured to fix the tip surface of the cushioning portion and the flange portion by welding, and a welding fixing portion.
Is equipped with
Further, the buffer portion has a configuration in which the outer surface thereof includes a heat-burned region whose surface state has changed due to heat and a normal region whose surface state has not changed due to heat, and has the tip surface and the tip surface and the normal region. The outer peripheral surface is provided with at least the heat-burned region, and the rear end surface is provided with only the normal region.
Sensor.
前記鍔部および前記緩衝部は、オーステナイト系又はフェライト系のステンレス鋼で形成される、
請求項1に記載のセンサ。
The collar and the buffer are made of austenitic or ferritic stainless steel.
The sensor according to claim 1.
前記鍔部、前記緩衝部、前記螺合挟持部は、全てオーステナイト系のステンレス鋼で形成されるか、または、全てフェライト系のステンレス鋼で形成されるかのいずれかである、
請求項1または請求項2に記載のセンサ。
The collar portion, the cushioning portion, and the screw holding portion are either all made of austenitic stainless steel or all made of ferritic stainless steel.
The sensor according to claim 1 or 2.
前記回り止め部は、前記熱焼け領域および前記溶接固定部から離れた位置に形成されている、
請求項1から請求項3のうちいずれか一項に記載のセンサ。
The detent portion is formed at a position away from the heat-burned region and the weld fixing portion.
The sensor according to any one of claims 1 to 3.
センサ固定部に取り付けられて状態量を検出するセンサであって、
軸線方向に延びる長尺形状に形成されて、前記軸線方向の先端側に前記状態量を検出する検知部を有するセンサ本体部と、
前記センサ本体部の外周面から径方向外側に突出して形成される鍔部と、
前記センサ固定部に形成された固定用螺合溝と螺合する螺合部を有し、前記センサ固定部との間で前記鍔部を挟持するよう構成された螺合挟持部と、
前記鍔部に当接する先端面と前記螺合挟持部に当接する後端面とを備えて、前記鍔部と前記螺合挟持部との間に配置される緩衝部と、
を備え、
前記緩衝部は、
前記鍔部と前記螺合挟持部との間に配置される緩衝本体部と、
前記緩衝本体部の外周面から径方向外側に突出する形態であって、前記センサ固定部に形成された位置決め部と係合するように構成された回り止め部と、
前記緩衝本体部の前記先端面と前記鍔部とを溶接により固定するように構成された溶接固定部と、
を備えており、
前記緩衝本体部の前記先端面および前記緩衝本体部の前記外周面は、前記溶接固定部に隣接する溶接隣接領域を備えており、
前記緩衝本体部の前記後端面は、前記溶接隣接領域の酸化量よりも酸化量が小さい低酸化領域のみを備えており、
前記低酸化領域の酸化量は、前記溶接隣接領域の酸化量から第1特定割合相当値を差し引いた値である第1判定基準値未満であり、
前記第1特定割合相当値は、前記溶接隣接領域の酸化量と前記回り止め部の酸化量との差である酸化量差分値に対する50%相当値である、
センサ。
It is a sensor that is attached to the sensor fixing part to detect the state quantity.
A sensor main body that is formed in a long shape extending in the axial direction and has a detection unit that detects the state quantity on the tip side in the axial direction.
A flange portion formed so as to project radially outward from the outer peripheral surface of the sensor main body portion,
A screw holding portion having a screw portion screwed with a fixing screw groove formed in the sensor fixing portion and configured to sandwich the collar portion between the sensor fixing portion and the screw holding portion.
A buffer portion provided between the flange portion and the screw holding portion, which is provided with a front end surface that abuts on the flange portion and a rear end surface that abuts on the screw holding portion.
With
The shock absorber
A buffer body portion arranged between the flange portion and the screw holding portion, and
A detent portion that projects radially outward from the outer peripheral surface of the buffer body portion and is configured to engage with a positioning portion formed on the sensor fixing portion.
A welded fixing portion configured to fix the tip surface of the buffer body portion and the flange portion by welding, and
Is equipped with
The tip surface of the buffer body and the outer peripheral surface of the buffer body include a weld adjacent region adjacent to the weld fixing portion.
The rear end surface of the buffer body portion includes only a low oxidation region in which the oxidation amount is smaller than the oxidation amount in the welding adjacent region.
The oxidation amount in the low oxidation region is less than the first determination reference value, which is a value obtained by subtracting the value corresponding to the first specific ratio from the oxidation amount in the welding adjacent region.
The first specific ratio equivalent value is a value equivalent to 50% with respect to the oxidation amount difference value, which is the difference between the oxidation amount of the welding adjacent region and the oxidation amount of the detent portion.
Sensor.
前記低酸化領域の酸化量は、前記溶接隣接領域の酸化量から第2特定割合相当値を差し引いた値である第2判定基準値未満であり、
前記第2特定割合相当値は、前記酸化量差分値に対する90%相当値である、
請求項5に記載のセンサ。
The oxidation amount in the low oxidation region is less than the second determination reference value, which is a value obtained by subtracting the value corresponding to the second specific ratio from the oxidation amount in the welding adjacent region.
The second specific ratio equivalent value is a value equivalent to 90% of the oxidation amount difference value.
The sensor according to claim 5.
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