JP4716287B2 - Sensor - Google Patents
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- JP4716287B2 JP4716287B2 JP2006283197A JP2006283197A JP4716287B2 JP 4716287 B2 JP4716287 B2 JP 4716287B2 JP 2006283197 A JP2006283197 A JP 2006283197A JP 2006283197 A JP2006283197 A JP 2006283197A JP 4716287 B2 JP4716287 B2 JP 4716287B2
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- 229910052751 metal Inorganic materials 0.000 claims description 29
- 239000002184 metal Substances 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 238000013022 venting Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 34
- 150000003839 salts Chemical class 0.000 description 16
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000002788 crimping Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- -1 for example Chemical class 0.000 description 3
- 239000007784 solid electrolyte Substances 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 229920001973 fluoroelastomer Polymers 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229910002077 partially stabilized zirconia Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
Description
本発明は、センサに関するものであり、具体的には、酸素センサ、ＨＣセンサ、ＮＯｘセンサなど、測定対象となる雰囲気中の被検出成分を検出するためのガスセンサや測定対象となる雰囲気中の温度を測定する温度センサなどに関する。 The present invention relates to a sensor, and specifically, a gas sensor for detecting a component to be detected in an atmosphere to be measured, such as an oxygen sensor, an HC sensor, and a NOx sensor, and a temperature in the atmosphere to be measured. The present invention relates to a temperature sensor that measures
従来より、雰囲気中の被検出成分を検出する検出部が先端に形成されたセンサ素子を、金属製のケーシングの内側に配置した構造を備えたガスセンサが知られている。この金属製のケーシングは、外周面にセンサ取付用のネジ部が形成された主体金具、該主体金具の先端側から突出するセンサ素子の検出部を覆うようにして主体金具に結合されるプロテクタ、前記主体金具の後端側の開口部に連結され、該開口部から後方に延びるセンサ素子を覆う内筒部材、該内筒部材の径方向周囲を覆うとともに、撥水フィルタを介して配置された外筒部材等の複数の筒状体を組合せて構成されている。 2. Description of the Related Art Conventionally, there is known a gas sensor having a structure in which a sensor element having a detection portion for detecting a component to be detected in an atmosphere is disposed at the tip of a sensor casing, which is disposed inside a metal casing. The metal casing includes a metal shell having a sensor mounting screw portion formed on the outer peripheral surface, a protector coupled to the metal shell so as to cover the sensor element detection portion protruding from the tip side of the metal shell, An inner cylinder member that is connected to an opening on the rear end side of the metal shell and covers a sensor element extending rearward from the opening, covers the circumference of the inner cylinder member in the radial direction, and is disposed through a water repellent filter A plurality of cylindrical bodies such as outer cylinder members are combined.
このようなガスセンサ（例えば、酸素センサ）は、例えば、自動車エンジンの排気系統の排気管等に装着される。また、最近では、排ガス中の有機物質を分解する触媒装置を排気管に設け、その触媒装置の下流側にガスセンサを装着することで、有機物質が除かれた排ガス中の被検出成分を測定するものが一般的となっている。この場合、ガスセンサは、エンジンから自動車の底部に沿って後方に延びる排気管の下流側に配置されるため、自動車走行時の水ハネ等により、ガスセンサの外表面に水滴等が付着することがある。したがって、水滴等がガスセンサ内に侵入するのを避けるために、フィルタと外筒部材、またはフィルタと内筒部材との接合を確実に行い、ガスセンサの水密性を確保することが重要であった。 Such a gas sensor (for example, oxygen sensor) is attached to, for example, an exhaust pipe of an exhaust system of an automobile engine. Recently, a catalyst device for decomposing organic substances in exhaust gas is provided in an exhaust pipe, and a gas sensor is mounted on the downstream side of the catalyst device to measure a component to be detected in exhaust gas from which organic substances have been removed. Things have become commonplace. In this case, since the gas sensor is disposed on the downstream side of the exhaust pipe extending rearward from the engine along the bottom of the automobile, water droplets or the like may adhere to the outer surface of the gas sensor due to water splashes or the like when the automobile is running. . Therefore, in order to prevent water droplets or the like from entering the gas sensor, it is important to securely join the filter and the outer cylinder member or the filter and the inner cylinder member to ensure the water tightness of the gas sensor.
そこで、このようなフィルタと外筒部材、またはフィルタと内筒部材との接合する方法として加締め固定がある。具体的には、外筒部材のフィルタとの重なり部を径方向内側に加締め固定されたガスセンサが知られている。（例えば、特許文献１参照）。このガスセンサの場合、例えば、外筒部材の先端側に、径方向内側に縮径する凹状の連結加締め部（加締め固定部）が形成され、フィルタが変形することで、該連結加締め部がフィルタの外表面に密着すると共に、内筒部材がフィルタの内表面に密着することで、水密性の高いガスセンサが得られる。 Therefore, there is caulking and fixing as a method of joining such a filter and an outer cylinder member, or a filter and an inner cylinder member. Specifically, a gas sensor is known in which an overlapping portion of an outer cylinder member with a filter is caulked and fixed radially inward. (For example, refer to Patent Document 1). In the case of this gas sensor, for example, a concave connection crimping portion (caulking fixing portion) whose diameter is reduced radially inward is formed on the distal end side of the outer cylinder member, and the connection caulking portion is deformed by deforming the filter. Is closely attached to the outer surface of the filter, and the inner cylinder member is closely attached to the inner surface of the filter, whereby a gas sensor with high water tightness can be obtained.
ところで、外筒部材の先端側における加締め位置は、誤差範囲内での位置ズレを許容するため、外筒部材の先端から後方側にやや離れた位置にされることが多い。しかし、この位置で加締めがなされると、外筒部材に形成された連結加締め部よりも先端側の残余部分がやや浮き上がるので、外筒部材の先端部と内筒部材の外表面との間に隙間が形成される。すると、この隙間にガスセンサの外表面に付着した水滴が引き込まれ、その隙間に引き込まれた水は、水の有する表面張力によって長期間その隙間に保持される。 By the way, the caulking position on the distal end side of the outer cylinder member is often set to a position slightly away from the distal end of the outer cylinder member to the rear side in order to allow positional deviation within an error range. However, if caulking is performed at this position, the remaining portion on the distal end side rises slightly from the connecting caulking portion formed on the outer cylinder member, so that the distal end portion of the outer cylinder member and the outer surface of the inner cylinder member A gap is formed between them. Then, water droplets attached to the outer surface of the gas sensor are drawn into the gap, and the water drawn into the gap is held in the gap for a long time by the surface tension of water.
特にこの隙間に金属塩を含むような水溶液、例えば塩水（塩分を含んだ水）が引き込まれた場合、外筒部材の内表面と内筒部材の外表面との間では化学反応が起こり、内筒部材の外表面及び外筒部材の内表面がともに腐食する恐れがあった。例えば、積雪の多い寒冷地では、塩化カルシウムを主成分とする融雪剤がまかれるのが一般的であるため、融雪して地面に出来た水溜まりは、この塩化カルシウムが溶解して出来た塩水となっていることが多い。よって、この水溜まり上を自動車が通過することにより、ガスセンサの表面には塩水が付着する。すると、外筒部材の先端と内筒部材の外周面との間に出来た隙間には、その塩水が引き込まれて保持されてしまうので、錆びが発生し、内筒部材及び外筒部材を腐食させる恐れがあった。さらに、内筒部材の腐食が進行するとクラックを生じることもあり、そのクラックから塩水が外筒の内側に侵入してしまい、センサ内部の構成部材を錆びさせ、特に電気的接続部材に錆びを発生させるとそこが絶縁体となり電気的に不導通となったり、センサの検出精度が低下する恐れもあった。 In particular, when an aqueous solution containing a metal salt, for example, salt water (water containing salt) is drawn into the gap, a chemical reaction occurs between the inner surface of the outer cylinder member and the outer surface of the inner cylinder member. Both the outer surface of the cylindrical member and the inner surface of the outer cylindrical member may corrode. For example, in cold regions where there is a lot of snow, it is common to apply a snow melting agent mainly composed of calcium chloride. Therefore, the water pool that is formed on the ground after melting snow is composed of salt water formed by dissolving this calcium chloride. Often has become. Therefore, salt water adheres to the surface of the gas sensor as the automobile passes over the water reservoir. Then, since the salt water is drawn and held in the gap formed between the tip of the outer cylinder member and the outer peripheral surface of the inner cylinder member, rust is generated and the inner cylinder member and the outer cylinder member are corroded. There was a fear. Furthermore, when corrosion of the inner cylinder member progresses, cracks may occur, and salt water enters the inside of the outer cylinder from the cracks, rusting the components inside the sensor and generating rust especially on the electrical connection members. If this is done, it may become an insulator and become electrically non-conductive, or the detection accuracy of the sensor may be lowered.
本発明は、上記課題を解決するためになされたものであり、塩水の付着による外筒部材及び内筒部材の腐食を防止でき、かつ水密性を向上できるセンサを提供することを目的とする。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sensor that can prevent corrosion of an outer cylinder member and an inner cylinder member due to adhesion of salt water and can improve water tightness.
上記目的を達成するために、請求項１に係る発明のセンサは、内燃機関の吸排気管に取り付けられるセンサであって、軸線方向に延びるセンサ素子と、当該センサ素子を保持する主体金具と、当該主体金具の後端側に固定され、内部に大気を通気できる少なくとも１つ以上の大気導入孔を有する内筒部材と、前記内筒部材の前記大気導入孔を覆うように配置されたフィルタと、フィルタを介して当該内筒部材の径方向周囲を覆う外筒部材と、を備え、当該外筒部材には、当該フィルタを介して径方向内側に加締められた加締め固定部が形成されたセンサにおいて、
前記フィルタの先端は前記加締め固定部の先端よりも先端側に位置し、かつ前記外筒部材の先端と前記フィルタの先端との軸線方向の距離が０．３ｍｍ以下であり、前記加締め固定部の先端よりも先端側において、前記フィルタは前記外筒部材と前記内筒部材との隙間をなくすよう配置され、前記加締め固定部の先端よりも先端側において、前記フィルタの外周面と前記外筒部材の内周面及び前記フィルタの内周面と前記内筒部材の外周面が、接触するよう配置され、前記フィルタは、前記内筒部材の周囲を覆う筒状体であることを特徴とする。
In order to achieve the above object, a sensor according to a first aspect of the present invention is a sensor attached to an intake and exhaust pipe of an internal combustion engine, the sensor element extending in the axial direction, a metal shell holding the sensor element, An inner cylinder member that is fixed to the rear end side of the metal shell and has at least one atmosphere introduction hole capable of venting the atmosphere therein, and a filter disposed so as to cover the atmosphere introduction hole of the inner cylinder member; An outer cylinder member that covers the periphery of the inner cylinder member in the radial direction via a filter, and a caulking fixing portion that is caulked radially inward via the filter is formed on the outer cylinder member In the sensor
The distal end of the filter is located closer to the distal end side than the distal end of the caulking fixing portion, and the axial distance between the distal end of the outer cylinder member and the distal end of the filter is 0.3 mm or less , and the caulking fixing The filter is disposed so as to eliminate a gap between the outer cylinder member and the inner cylinder member on the distal end side of the distal end of the part, and on the distal end side of the distal end of the caulking fixing part, the outer peripheral surface of the filter and the filter The inner peripheral surface of the outer cylindrical member, the inner peripheral surface of the filter, and the outer peripheral surface of the inner cylindrical member are arranged in contact with each other, and the filter is a cylindrical body that covers the periphery of the inner cylindrical member. And
また、請求項２に係る発明のセンサは、前記外筒部材の先端よりも前記フィルタの先端が先端側に位置することを特徴とする。 The sensor of the invention according to claim 2 is characterized in that the tip of the filter is located on the tip side of the tip of the outer cylinder member.
また、請求項３に係る発明のセンサは、前記センサ素子は、自身の先端側に形成された検出部にて被測定ガス中の被検出成分を検出し、前記主体金具は、自身の先端から前記検出部を突出させた状態で、前記センサ素子の径方向周囲を覆い、前記内筒部材は、前記センサ素子の後端側の径方向周囲を覆うことを特徴とする。 In the sensor according to the third aspect of the invention, the sensor element detects a component to be detected in the gas to be measured by a detection portion formed on the tip side of the sensor element, and the metal shell is connected to the tip of the sensor element. In a state where the detection unit is protruded, the sensor element covers the periphery of the sensor element in the radial direction, and the inner cylinder member covers the periphery of the sensor element in the radial direction.
また、請求項４に係る発明のセンサは、前記フィルタは、通気量が１００ｃｍ３／ｍｉｎ以上であることを特徴とする。 The sensor of the invention according to claim 4 is characterized in that the filter has an air flow rate of 100 cm 3 / min or more.
また、請求項５に係る発明のセンサは、前記内筒部材は、前記大気導入孔が形成された径小部と、前記センサ素子の後端側の径方向周囲を覆う径大部と、前記径小部と前記径大部とを連結する拡径部とを有し、前記外筒部材の先端と前記拡径部との軸線方向の距離は０．５ｍｍ以上であることを特徴とする。
Further, in the sensor of the invention according to claim 5 , the inner cylinder member includes a small-diameter portion in which the air introduction hole is formed, a large-diameter portion that covers a radial periphery on the rear end side of the sensor element, A small diameter portion and a large diameter portion connecting the large diameter portion are included, and the axial distance between the distal end of the outer cylinder member and the large diameter portion is 0.5 mm or more.
請求項１に係る発明のセンサでは、フィルタの先端が加締め固定部の先端よりも先端側に位置しつつ、外筒部材の先端がフィルタの先端から０．３ｍｍ以下に配置されているので、フィルタによって外筒部材と内筒部材との隙間が小さく又は無くすことが出来るので、塩水が溜まって内筒部材及び外筒部材が腐食するのを防止でき、センサの検出精度の低下を防止できる。なお、外筒部材の先端がフィルタの先端から０．３ｍｍを越えると、外筒部分と内筒部分との隙間に水が溜まり、上記効果を得ることができない。また、フィルタが内筒部材の周囲を覆う筒状体であるので、センサ素子全周にわたって水密性を確保することができる。
In the sensor according to the first aspect of the present invention, the tip of the outer cylinder member is disposed at 0.3 mm or less from the tip of the filter while the tip of the filter is positioned on the tip side of the tip of the caulking fixing part. Since the gap between the outer cylinder member and the inner cylinder member can be reduced or eliminated by the filter, salt water can be prevented from accumulating and the inner cylinder member and the outer cylinder member can be prevented from corroding, and a decrease in detection accuracy of the sensor can be prevented. If the tip of the outer cylinder member exceeds 0.3 mm from the tip of the filter, water accumulates in the gap between the outer cylinder part and the inner cylinder part, and the above effect cannot be obtained. Further, since the filter is a cylindrical body that covers the periphery of the inner cylinder member, water tightness can be ensured over the entire circumference of the sensor element.
また、請求項２に係る発明のセンサは、外筒部材の先端よりもフィルタの先端が先端側に位置することで、フィルタによって外筒部材と内筒部材との隙間を無くすことが出来るので、塩水が溜まって内筒部材及び外筒部材が腐食するのを防止でき、センサの検出精度の低下を防止できる。 Further, in the sensor of the invention according to claim 2, since the tip of the filter is located on the tip side rather than the tip of the outer cylinder member, the filter can eliminate the gap between the outer cylinder member and the inner cylinder member. It can prevent that salt water accumulates and an inner cylinder member and an outer cylinder member corrode, and can prevent the detection accuracy of a sensor from falling.
また、請求項３に係る発明のセンサは、センサ素子が、自身の先端側に形成された検出部にて被測定ガス中の被検出成分を検出するガスセンサ素子であっても、上記効果を得ることができる。 In the sensor according to the third aspect of the present invention, the above effect can be obtained even when the sensor element is a gas sensor element that detects a component to be detected in a gas to be measured by a detection portion formed on the tip side of the sensor element. be able to.
また、請求項４に係る発明のセンサは、フィルタの通気量が１００ｃｍ３／ｍｉｎ以上となることで、外筒部材の加締め固定部によってフィルタが変形したとしても、内筒部材内に大気を良好に挿通することができる。つまり、外筒部材とフィルタ、及び内筒部材とフィルタの水密性を確保しつつ、良好な通気性を得ることができる。 Further, in the sensor according to the fourth aspect of the present invention, even if the filter is deformed by the caulking and fixing portion of the outer cylinder member because the air flow rate of the filter is 100 cm 3 / min or more, the atmosphere in the inner cylinder member is It can be inserted well. That is, good air permeability can be obtained while ensuring the water tightness of the outer cylinder member and the filter and the inner cylinder member and the filter.
また、請求項５に係る発明のセンサは、内筒部材に径小部と径大部とを連結する拡径部を有する場合、外筒部材の先端と拡径部との軸線方向の距離を０．５ｍｍ以上とするとことで、外筒部材の先端から拡径部までの軸線方向の長さを出来る限り長く出来る。よって、外筒部材の先端と拡径部との間にて、塩水の有する表面張力によって長期間その間に保持されることを防止できる。よって、塩水が溜まって内筒部材及び外筒部材が腐食するのを防止でき、センサの検出精度の低下を防止できる。
In the sensor according to the fifth aspect of the present invention, when the inner cylindrical member has an enlarged diameter portion that connects the small diameter portion and the large diameter portion, the axial distance between the distal end of the outer cylindrical member and the enlarged diameter portion is determined. By setting it as 0.5 mm or more, the length of the axial direction from the front-end | tip of an outer cylinder member to an enlarged diameter part can be made as long as possible. Therefore, it can prevent being kept between the front-end | tip of an outer cylinder member and a diameter-expanded part in the meantime by the surface tension which salt water has. Therefore, it can prevent that salt water accumulates and an inner cylinder member and an outer cylinder member corrode, and can prevent the fall of the detection accuracy of a sensor.
以下、本発明のセンサ及びガスセンサの一実施の形態であるガスセンサ１について、図面に基づいて説明する。図１は、本実施形態であるガスセンサ１の断面図であり、図２は、外筒部材１６の加締め固定部７５近傍を示す部分拡大図である。なお、本実施形態のガスセンサ１は、自動車の排気管に装着されて使用に供されるものであって、排気管内を流通する排気ガス中の酸素濃度を検出する酸素センサである。 Hereinafter, the sensor of the present invention and gas sensor 1 which is one embodiment of a gas sensor are explained based on a drawing. FIG. 1 is a cross-sectional view of the gas sensor 1 according to the present embodiment, and FIG. 2 is a partially enlarged view showing the vicinity of the caulking fixing portion 75 of the outer cylinder member 16. In addition, the gas sensor 1 of this embodiment is an oxygen sensor that is mounted on an exhaust pipe of an automobile for use and detects an oxygen concentration in exhaust gas flowing through the exhaust pipe.
はじめに、ガスセンサ１について説明する。図１に示すように、ガスセンサ１は、先端部が閉塞された有底筒状をなすセンサ素子２、センサ素子２の有底孔２５に挿入されるセラミックヒータ３、センサ素子２を自身の内側にて保持する主体金具５、該主体金具５の後端部に連結された内筒部材１４、該内筒部材１４と同軸上に設けられ、内筒部材１４の後端側を内挿する外筒部材１６を備える。なお、本実施形態において、図１に示すセンサ素子２の軸に沿う方向のうち、測定対象ガス（排気ガス）に曝される先端部に向かう側（閉じている側、図中の下側）を「先端側」とし、これと反対方向（図中上側）に向かう側を「後端側」として説明する。 First, the gas sensor 1 will be described. As shown in FIG. 1, the gas sensor 1 includes a sensor element 2 having a bottomed cylindrical shape with a closed end, a ceramic heater 3 inserted into a bottomed hole 25 of the sensor element 2, and the sensor element 2 inside thereof. The metal shell 5 held by the metal shell 5, the inner cylinder member 14 connected to the rear end of the metal shell 5, and the outer cylinder provided coaxially with the inner cylinder member 14 and interpolating the rear end side of the inner cylinder member 14. A cylindrical member 16 is provided. In the present embodiment, of the directions along the axis of the sensor element 2 shown in FIG. 1, the side facing the tip exposed to the measurement target gas (exhaust gas) (the closed side, the lower side in the figure). Will be described as “front end side”, and the side in the opposite direction (upper side in the drawing) as “rear end side”.
まず、センサ素子２について説明する。このセンサ素子２は、イットリアを安定化剤として固溶させた部分安定化ジルコニアを主成分とする酸素イオン伝導性を有する固体電解質体２８と、その固体電解質体２８の有底孔２５の内面に、そのほぼ全面を覆うようにＰｔ又はＰｔ合金により多孔質状に形成された内部電極層２７と、固体電解質体２８の外面に、内部電極層２７と同様に多孔質状に形成された外部電極層２６を有している。また、センサ素子２には、外部電極層２６を被覆するアルミナマグネシアスピネル等の耐熱性セラミックよりなる多孔質状の電極保護層９９がさらに設けられている。また、このセンサ素子２の軸線方向の略中間位置には、径方向外側に向かって突出する係合フランジ部９２が設けられている。また、セラミックヒータ３は、棒状に形成されると共に、内部に発熱抵抗体を有する発熱部４２を備えている。このセラミックヒータ３は、後述するヒータ用リード線１９，２２を介して通電されることにより発熱部４２が発熱することになり、センサ素子２を活性化させるべく当該センサ素子２を加熱する機能を果たす。 First, the sensor element 2 will be described. The sensor element 2 includes a solid electrolyte body 28 having oxygen ion conductivity mainly composed of partially stabilized zirconia in which yttria is dissolved as a stabilizer, and an inner surface of a bottomed hole 25 of the solid electrolyte body 28. The internal electrode layer 27 formed porous by Pt or a Pt alloy so as to cover almost the entire surface, and the external electrode formed porous on the outer surface of the solid electrolyte body 28 in the same manner as the internal electrode layer 27 It has a layer 26. The sensor element 2 is further provided with a porous electrode protection layer 99 made of a heat-resistant ceramic such as alumina magnesia spinel that covers the external electrode layer 26. Further, an engagement flange portion 92 that protrudes radially outward is provided at a substantially intermediate position in the axial direction of the sensor element 2. The ceramic heater 3 is formed in a rod shape and includes a heat generating portion 42 having a heat generating resistor therein. When the ceramic heater 3 is energized through heater lead wires 19 and 22, which will be described later, the heat generating portion 42 generates heat, and has a function of heating the sensor element 2 to activate the sensor element 2. Fulfill.
次に、主体金具５について説明する。この主体金具５は、ガスセンサ１を排気管の取り付け部に取り付けるためのネジ部６６と、排気管の取り付け部への取り付け時に取付工具をあてがう六角部９３を有している。 Next, the metal shell 5 will be described. The metal shell 5 has a screw portion 66 for attaching the gas sensor 1 to the attachment portion of the exhaust pipe, and a hexagonal portion 93 to which an attachment tool is applied at the time of attachment to the attachment portion of the exhaust pipe.
そして、主体金具５の先端側内周には、径方向内側に向かって突出する金具側段部５４が設けられ、該金具側段部５４には、パッキン５５を介してアルミナ製の支持部材５１が係止している。なお、センサ素子２は、係合フランジ部９２が支持部材５１上に支持されることにより、主体金具５に支持される。支持部材５１の後端側における主体金具５の内面とセンサ素子２の外面との間には、滑石粉末からなる充填部材５２が充填され、さらにこの充填部材５２の後端側にアルミナ製のスリーブ５３及び環状リング１５が順次同軸状に内挿された状態で配置される。 A metal-side stepped portion 54 that protrudes inward in the radial direction is provided on the inner periphery on the front end side of the metal shell 5. A support member 51 made of alumina is provided on the metal-side stepped portion 54 via a packing 55. Is locked. The sensor element 2 is supported by the metal shell 5 when the engagement flange portion 92 is supported on the support member 51. A filling member 52 made of talc powder is filled between the inner surface of the metal shell 5 and the outer surface of the sensor element 2 on the rear end side of the support member 51, and an alumina sleeve is further provided on the rear end side of the filling member 52. 53 and the annular ring 15 are sequentially arranged coaxially.
また、主体金具５の先端側外周には、センサ素子２の主体金具５の先端から突出する先端部を覆うとともに、複数のガス取入れ孔を有する金属製の二重のプロテクタ８１，８２が溶接によって取り付けられている。 Further, a metal double protector 81, 82 having a plurality of gas intake holes is welded to the outer periphery of the front end of the main metal shell 5 so as to cover the front end portion protruding from the front end of the main metal shell 5 of the sensor element 2. It is attached.
次に、内筒部材１４について説明する。この内筒部材１４は、ステンレス材で形成され、自身の先端側が主体金具５の後端側内側に挿入されている。そして、この内筒部材１４は、先端側の拡径した開口端部である先端開口端部５９を環状リング１５に当接させた状態で、主体金具５の金具側後端部６０を内側先端方向に加締めることで、主体金具５に固定されている。なお、ガスセンサ１においては、主体金具５の金具側後端部６０を加締めることを通じて、充填部材５２がスリーブ５３を介して圧縮充填される構造になっている。これにより、センサ素子２が筒状の主体金具５の内側に水密状に保持されている。 Next, the inner cylinder member 14 will be described. The inner cylinder member 14 is formed of a stainless steel material, and the front end side of the inner cylinder member 14 is inserted inside the rear end side of the metal shell 5. The inner cylinder member 14 is configured such that the metal-side rear end 60 of the metal shell 5 is connected to the inner front end in a state in which the front-end open end 59 which is an enlarged open end on the front end is in contact with the annular ring 15. It is fixed to the metal shell 5 by caulking in the direction. The gas sensor 1 has a structure in which the filling member 52 is compressed and filled through the sleeve 53 by crimping the metal-side rear end 60 of the metal shell 5. Thereby, the sensor element 2 is held in a watertight manner inside the cylindrical metal shell 5.
さらに、内筒部材１４は、軸線方向における略中間位置に内筒段付き部８３が形成されており、内筒段付き部８３よりも先端側が内筒先端側胴部６１として形成され、内筒段付き部８３よりも後端側が内筒後端側胴部６２として形成される。そして、内筒後端側胴部６２は、内筒先端側胴部６１よりも内径、外径がともに小さく形成され、その内径は後述するセパレータ７のセパレータ本体部８５の外径よりも若干大きく形成されている。また、内筒後端側胴部６２には、周方向に沿って所定の間隔で複数の大気導入孔６７が形成されている。なお、本実施形態における内筒先端側胴部６１が本願の「径大部」に相当し、内筒後端側胴部６２が本願の「径小部」に相当し、内筒段付き部８３が本願の「拡径部」に相当する。 Further, the inner cylinder member 14 is formed with an inner cylinder stepped portion 83 at a substantially intermediate position in the axial direction, the tip side of the inner cylinder stepped portion 83 is formed as an inner cylinder tip side body portion 61, and the inner cylinder The rear end side of the stepped portion 83 is formed as the inner cylinder rear end side body portion 62. The inner cylinder rear end side body part 62 is formed to have both an inner diameter and an outer diameter smaller than the inner cylinder front end side body part 61, and the inner diameter is slightly larger than an outer diameter of a separator body 85 of the separator 7 described later. Is formed. In addition, a plurality of air introduction holes 67 are formed in the inner cylinder rear end side body portion 62 at predetermined intervals along the circumferential direction. In this embodiment, the inner cylinder front end side body portion 61 corresponds to the “large diameter portion” of the present application, the inner cylinder rear end side body portion 62 corresponds to the “small diameter portion” of the present application, and the inner cylinder stepped portion. 83 corresponds to the “expanded portion” of the present application.
次に、外筒部材１６について説明する。この外筒部材１６は、ステンレス材の板材を深絞り加工することにより筒状に成型され、後端側に外部から内部に通じる開口を含む外筒後端側部６３、先端側に内筒部材１４に対して後端側から同軸状に連結される外筒先端側部６４、外筒後端側部６３と外筒先端側部６４とをつなぐ外筒段部３５が形成される。なお、外筒後端側部６３には、後述する弾性シール部材１１を水密状に固定するための加締め部８８が形成されている。 Next, the outer cylinder member 16 will be described. The outer cylinder member 16 is formed into a cylindrical shape by deep drawing a stainless steel plate, and includes an outer cylinder rear end side portion 63 including an opening communicating from the outside to the rear end side, and an inner cylinder member on the tip end side. 14, an outer cylinder front end side portion 64 that is coaxially connected from the rear end side, and an outer cylinder step end portion 35 that connects the outer cylinder rear end side portion 63 and the outer cylinder front end side portion 64 are formed. The outer cylinder rear end side portion 63 is formed with a caulking portion 88 for fixing a later-described elastic seal member 11 in a watertight manner.
さらに、内筒部材１４の内筒後端側胴部６２の外側には、大気導入孔６７から水が侵入するのを防止するための筒状のフィルタ６８が配置されている。なお、フィルタ６８は、例えばポリテトラフルオロエチレンの多孔質繊維構造体のように、水を主体とする液体の透過は阻止する一方、空気などの気体の透過は許容する撥水性フィルタとして構成される。 Further, a cylindrical filter 68 for preventing water from entering through the air introduction hole 67 is disposed outside the inner cylinder rear end side body portion 62 of the inner cylinder member 14. The filter 68 is configured as a water-repellent filter that blocks the transmission of a liquid mainly composed of water while allowing the transmission of a gas such as air, such as a polytetrafluoroethylene porous fiber structure. .
また、外筒部材１６の外筒先端側部６４は、フィルタ６８が配置された内筒部材１４（詳細には内筒後端側胴部６２）を外側から覆う形状に形成されており、外筒先端側部６４のうち、フィルタ６８に対応する位置には周方向に沿って所定の間隔で複数の大気導入孔８４が形成されている。 Further, the outer cylinder front end side portion 64 of the outer cylinder member 16 is formed in a shape that covers the inner cylinder member 14 (specifically, the inner cylinder rear end side body portion 62) on which the filter 68 is disposed from the outside. A plurality of air introduction holes 84 are formed at predetermined intervals along the circumferential direction at positions corresponding to the filter 68 in the cylinder tip side portion 64.
次に、内筒部材１４と外筒部材１６との連結構造について説明する。図１に示すように、外筒部材１６と内筒部材１４とは、外筒部材１６の外筒先端側部６４のうちで、大気導入孔８４よりも後端側の少なくとも一部を、フィルタ６８を介して径方向内側に加締めることで形成した第１加締め部５６と、大気導入孔８４よりも先端側の少なくとも一部を、同じくフィルタ６８を介して径方向内側に加締めることで形成した加締め固定部７５とによって固定されている。このとき、フィルタ６８は、外筒部材１６と内筒部材１４との間で水密状に保持されることになる。この加締め固定部７５とフィルタ６８との位置が本発明の特徴であり、その作用効果については後述する。 Next, a connection structure between the inner cylinder member 14 and the outer cylinder member 16 will be described. As shown in FIG. 1, the outer cylinder member 16 and the inner cylinder member 14 filter out at least a part of the outer cylinder front end side portion 64 of the outer cylinder member 16 on the rear end side from the atmosphere introduction hole 84. The first caulking portion 56 formed by caulking inward in the radial direction via 68 and at least part of the tip side from the air introduction hole 84 are caulked inward in the radial direction through the filter 68 as well. It is fixed by the formed caulking fixing part 75. At this time, the filter 68 is held in a watertight manner between the outer cylinder member 16 and the inner cylinder member 14. The position of the caulking fixing part 75 and the filter 68 is a feature of the present invention, and the function and effect will be described later.
このようにして、内筒部材１４に外筒部材１６が加締め固定されることで、弛みなく互いに連結される。そして、基準ガスとしての大気は、大気導入孔８４，フィルタ６８及び大気導入孔６７、内筒部材１４の内部に導入され、センサ素子２の有底孔２５に導入される。一方、水滴はフィルタ６８を通過することが出来ないため、内筒部材１４の内側への侵入が阻止される。 In this way, the outer cylinder member 16 is caulked and fixed to the inner cylinder member 14 so that they are connected to each other without slack. The atmosphere as the reference gas is introduced into the atmosphere introduction hole 84, the filter 68 and the atmosphere introduction hole 67, and the inner cylinder member 14, and is introduced into the bottomed hole 25 of the sensor element 2. On the other hand, since water droplets cannot pass through the filter 68, entry into the inner cylinder member 14 is prevented.
次に、内筒部材１４及び外筒部材１６の内側構造について説明する。図１に示すように、内筒部材１４の内筒後端側胴部６２の内側には、略円筒状のセパレータ７が設けられている。このセパレータ７には、素子用リード線２０、２１と、ヒータ用リード線１９、２２とを挿通するためのセパレータリード線挿通孔７１が、先端側から後端側にかけて貫通するように形成されている。また、セパレータ７には、先端面に開口する有底状の保持孔９５が軸線方向に形成されている。この保持孔９５内には、セラミックヒータ３の後端部が挿入され、セラミックヒータ３の後端面が保持孔９５の底面に当接することでセパレータ７に対するセラミックヒータ３の軸線方向の位置決めがなされる。 Next, the inner structures of the inner cylinder member 14 and the outer cylinder member 16 will be described. As shown in FIG. 1, a substantially cylindrical separator 7 is provided inside the inner cylinder rear end side body portion 62 of the inner cylinder member 14. The separator 7 is formed with a separator lead wire insertion hole 71 for inserting the element lead wires 20 and 21 and the heater lead wires 19 and 22 so as to penetrate from the front end side to the rear end side. Yes. Further, the separator 7 is formed with a bottomed holding hole 95 opened in the front end surface in the axial direction. The rear end portion of the ceramic heater 3 is inserted into the holding hole 95, and the ceramic heater 3 is positioned in the axial direction with respect to the separator 7 by abutting the rear end surface of the ceramic heater 3 against the bottom surface of the holding hole 95. .
さらに、このセパレータ７は、内筒部材１４の後端内側に挿入されるセパレータ本体部８５を有するとともに、セパレータ本体部８５の後端部から周方向外側に延設されたセパレータフランジ部８６を有している。つまり、セパレータ７は、セパレータ本体部８５が内筒部材１４に挿入されるとともに、セパレータフランジ部８６が内筒部材１４の後端面にフッ素ゴムからなる環状シール部材４０を介して支持される状態で、外筒部材１６の内側に配置される。 Further, the separator 7 has a separator main body portion 85 that is inserted inside the rear end of the inner cylinder member 14, and has a separator flange portion 86 that extends outward from the rear end portion of the separator main body portion 85 in the circumferential direction. is doing. That is, in the separator 7, the separator body 85 is inserted into the inner cylinder member 14, and the separator flange 86 is supported on the rear end surface of the inner cylinder member 14 via the annular seal member 40 made of fluoro rubber. The inner cylinder member 16 is disposed inside.
一方、セパレータ７の後端側には、耐熱性に優れるフッ素ゴム等からなる弾性シール部材１１が配置されている。この弾性シール部材１１は、本体部３１、本体部３１の先端側の側周面から径方向外側に向けて延びるシール部材鍔部３２を有している。さらに、この本体部３１を軸線方向に貫くように４つのリード線挿通孔１７が形成されている。そして、このような弾性シール部材１１が、外筒部材１６の後端内側に内挿され、外筒部材１６が加締められて、加締め部８８が形成されることによって、外筒部材１６に固定されている。 On the other hand, on the rear end side of the separator 7, an elastic seal member 11 made of fluoro rubber or the like having excellent heat resistance is disposed. The elastic seal member 11 includes a main body 31 and a seal member collar 32 extending from the side peripheral surface on the distal end side of the main body 31 toward the radially outer side. Further, four lead wire insertion holes 17 are formed so as to penetrate the main body portion 31 in the axial direction. And such an elastic seal member 11 is inserted inside the rear end of the outer cylinder member 16, and the outer cylinder member 16 is swaged to form a swaged portion 88. It is fixed.
また、素子用リード線２０、２１及びヒータ用リード線１９、２２は、セパレータ７のセパレータリード線挿通孔７１、弾性シール部材１１のリード線挿通孔１７を通じて、内筒部材１４及び外筒部材１６の内部から外部に向かって引き出されている。なお、これら４本のリード線１９、２０、２１、２２は外部において、図示しないコネクタに接続される。そして、このコネクタを介してＥＣＵ等の外部機器と各リード線１９、２０、２１、２２とは電気信号の入出力が行なわれることになる。 The element lead wires 20 and 21 and the heater lead wires 19 and 22 are passed through the separator lead wire insertion hole 71 of the separator 7 and the lead wire insertion hole 17 of the elastic seal member 11, and the inner cylinder member 14 and the outer cylinder member 16. It is drawn from the inside to the outside. These four lead wires 19, 20, 21, and 22 are externally connected to a connector (not shown). The external signals such as the ECU and the lead wires 19, 20, 21, and 22 are input / output via the connector.
さらに、各リード線１９、２０、２１、２２は、詳細は図示しないが、導線を樹脂からなる絶縁皮膜にて被覆した構造を有し、導線の後端側がコネクタに設けられるコネクタ端子に接続される。そして、素子用リード線２０の導線の先端側は、センサ素子２の外面に対して外嵌される端子金具４３の後端部と加締められ、素子用リード線２１の導線の先端側は、センサ素子２の内面に対して圧入される端子金具４４の後端部と加締められる。これにより、素子用リード線２０は、センサ素子２の外部電極層２６と電気的に接続され、素子用リード線２１は、内部電極層２７と電気的に接続される。他方、ヒータ用リード線１９、２２の導線の先端部は、セラミックヒータ３の発熱抵抗体と接合された一対のヒータ用端子金具と各々接続される。 Further, although not shown in detail, each lead wire 19, 20, 21, 22 has a structure in which the conducting wire is covered with an insulating film made of resin, and the rear end side of the conducting wire is connected to a connector terminal provided in the connector. The And the front end side of the conducting wire of the element lead wire 20 is crimped with the rear end portion of the terminal fitting 43 fitted on the outer surface of the sensor element 2, and the leading end side of the conducting wire of the element lead wire 21 is It is crimped to the rear end portion of the terminal fitting 44 press-fitted into the inner surface of the sensor element 2. Thereby, the element lead wire 20 is electrically connected to the external electrode layer 26 of the sensor element 2, and the element lead wire 21 is electrically connected to the internal electrode layer 27. On the other hand, the leading ends of the lead wires 19 and 22 for the heater are respectively connected to a pair of heater terminal fittings joined to the heating resistor of the ceramic heater 3.
次に、本発明の特徴である加締め固定部７５とフィルタ６８との位置について図２を用いて説明する。本実施形態のガスセンサ１では、加締め固定部７５の先端部である加締め先端位置よりもフィルタ６８の先端が先端側に位置しており、かつ、フィルタ６８の先端と、外筒部材１６の先端側との軸線方向の距離ｔ１が０．２ｍｍとなっている。このように、軸線方向の距離ｔ１が０．３ｍｍ以下とすることで、フィルタ６８の先端から外筒部材１６の先端までの軸線方向の長さを出来る限り短く出来る。よって、フィルタ６８よりも先端側に形成される外筒部材１６の先端側と内筒部材１４の先端側との隙間を小さくすることが出来るので、塩水が溜まって内筒部材１４及び外筒部材１６が腐食するのを防止でき、ガスセンサ１の検出精度の低下を防止できる。 Next, the positions of the caulking fixing part 75 and the filter 68, which are features of the present invention, will be described with reference to FIG. In the gas sensor 1 of the present embodiment, the tip end of the filter 68 is located on the tip side with respect to the crimping tip position, which is the tip portion of the crimping fixing portion 75, and the tip of the filter 68 and the outer cylinder member 16 A distance t1 in the axial direction from the tip side is 0.2 mm. Thus, by setting the axial distance t1 to 0.3 mm or less, the axial length from the tip of the filter 68 to the tip of the outer cylinder member 16 can be made as short as possible. Therefore, since the gap between the distal end side of the outer cylinder member 16 and the distal end side of the inner cylinder member 14 formed on the distal end side with respect to the filter 68 can be reduced, salt water accumulates and the inner cylinder member 14 and the outer cylinder member are collected. 16 can be prevented from corroding, and a decrease in detection accuracy of the gas sensor 1 can be prevented.
さらに、内筒段付き部８３と外筒部材１６の先端との軸線方向の距離ｔ２が０．６ｍｍとなっている。このように、外筒部材１６の先端と内筒段付き部８３との軸線方向の距離ｔ２を０．５ｍｍ以上とするとことで、外筒部材１６の先端から内筒段付き部８３までの軸線方向の長さを出来る限り長く出来る。よって、外筒部材１６の先端と内筒段付き部８３との間にて、塩水の有する表面張力によって長期間その間に保持されることを防止できる。よって、塩水が溜まって内筒部材１４及び外筒部材１６が腐食するのを防止でき、センサの検出精度の低下を防止できる。 Further, the axial distance t2 between the inner cylinder stepped portion 83 and the tip of the outer cylinder member 16 is 0.6 mm. Thus, by setting the axial distance t2 between the tip of the outer cylinder member 16 and the inner cylinder stepped portion 83 to be 0.5 mm or more, the axis line from the tip of the outer cylinder member 16 to the inner cylinder stepped portion 83 is set. The direction length can be as long as possible. Therefore, it can prevent being kept between the front-end | tip of the outer cylinder member 16 and the inner cylinder step part 83 by the surface tension which salt water has for a long period of time. Therefore, it can prevent that salt water accumulates and the inner cylinder member 14 and the outer cylinder member 16 corrode, and can prevent the detection accuracy of a sensor from deteriorating.
なお、本発明のセンサは上記実施形態に限られず、各種変更が可能なことは言うまでもない。上記実施形態では、フィルタ６８の先端が外筒部材１６の後端側にある形態であったが、フィルタ６８の先端が外筒部材１６の先端側にある形態であっても良い。 Needless to say, the sensor of the present invention is not limited to the above embodiment, and various modifications are possible. In the above embodiment, the front end of the filter 68 is on the rear end side of the outer cylinder member 16, but the front end of the filter 68 may be on the front end side of the outer cylinder member 16.
具体的には、図３に示すセンサ１を示す。なおこの別実施形態は、本実施形態のセンサ１とは、フィルタの位置が異なるものであり、その他の部分は省略する。図３は、外筒部材１６の加締め固定部７５近傍を示す部分拡大図である。 Specifically, the sensor 1 shown in FIG. 3 is shown. In addition, this another embodiment differs in the position of a filter from the sensor 1 of this embodiment, and abbreviate | omits other parts. FIG. 3 is a partially enlarged view showing the vicinity of the caulking fixing portion 75 of the outer cylinder member 16.
内筒部材１４の内筒後端側胴部６２の外側には、大気導入孔６７から水が侵入するのを防止するための筒状のフィルタ６８が配置されている。さらに、このフィルタ６８を覆い、且つ内筒部材１４の内筒後端側胴部６２の周囲を覆うように外筒部材１６が設けられている。この外筒部材１６にも、フィルタ６８に対応する位置には、周方向に沿って所定の間隔で複数の大気導入孔８４が形成されている。 A cylindrical filter 68 for preventing water from entering through the air introduction hole 67 is disposed outside the inner cylinder rear end side body 62 of the inner cylinder member 14. Furthermore, the outer cylinder member 16 is provided so as to cover the filter 68 and to cover the periphery of the inner cylinder rear end side body portion 62 of the inner cylinder member 14. Also in the outer cylinder member 16, a plurality of air introduction holes 84 are formed at predetermined intervals along the circumferential direction at positions corresponding to the filters 68.
そして、外筒部材１６の先端よりもフィルタ６８の先端が先端側に配置されている。このように、外筒部材１６の先端よりもフィルタ６８の先端が先端側に配置されていることで、フィルタ６８よりも先端側に形成される外筒部材１６の先端側と内筒部材１４の先端側との隙間をなくすことが出来るので、塩水が溜まって内筒部材１４及び外筒部材１６が腐食するのを防止でき、ガスセンサ１の検出精度の低下を防止できる。 And the front-end | tip of the filter 68 is arrange | positioned rather than the front-end | tip of the outer cylinder member 16 at the front end side. As described above, the distal end of the filter 68 is disposed closer to the distal end side than the distal end of the outer cylindrical member 16, so that the distal end side of the outer cylindrical member 16 and the inner cylindrical member 14 are formed closer to the distal end side than the filter 68. Since the gap with the front end side can be eliminated, salt water can be prevented from accumulating and the inner cylinder member 14 and the outer cylinder member 16 can be prevented from corroding, and a reduction in detection accuracy of the gas sensor 1 can be prevented.
本発明は、酸素センサ等のガスセンサに限らず、種々の装置に適用できる。 The present invention is not limited to gas sensors such as oxygen sensors, and can be applied to various devices.
１ ガスセンサ
２ センサ素子
５ 主体金具
７ セパレータ
１４ 内筒部材
１６ 外筒部材
６８ フィルタ
７５ 加締め固定部
DESCRIPTION OF SYMBOLS 1 Gas sensor 2 Sensor element 5 Main metal fitting 7 Separator 14 Inner cylinder member 16 Outer cylinder member 68 Filter 75 Clamping fixing | fixed part
Claims (5)
軸線方向に延びるセンサ素子と、
当該センサ素子を保持する主体金具と、
当該主体金具の後端側に固定され、内部に大気を通気できる少なくとも１つ以上の大気導入孔を有する内筒部材と、
前記内筒部材の前記大気導入孔を覆うように配置されたフィルタと、
フィルタを介して当該内筒部材の径方向周囲を覆う外筒部材と、を備え、
当該外筒部材には、当該フィルタを介して径方向内側に加締められた加締め固定部が形成されたセンサにおいて、
前記フィルタの先端は前記加締め固定部の先端よりも先端側に位置し、かつ前記外筒部材の先端と前記フィルタの先端との軸線方向の距離が０．３ｍｍ以下であり、
前記加締め固定部の先端よりも先端側において、前記フィルタは前記外筒部材と前記内筒部材との隙間をなくすよう配置され、
前記加締め固定部の先端よりも先端側において、前記フィルタの外周面と前記外筒部材の内周面及び前記フィルタの内周面と前記内筒部材の外周面が、接触するよう配置され、
前記フィルタは、前記内筒部材の周囲を覆う筒状体であることを特徴とするセンサ。 A sensor attached to an intake and exhaust pipe of an internal combustion engine,
A sensor element extending in the axial direction;
A metal shell for holding the sensor element;
An inner cylinder member that is fixed to the rear end side of the metal shell and has at least one air introduction hole capable of venting air inside;
A filter arranged to cover the air introduction hole of the inner cylinder member;
An outer cylinder member that covers the periphery of the inner cylinder member in the radial direction via a filter, and
In the outer cylinder member, in a sensor in which a caulking fixing portion caulked radially inward via the filter is formed,
The tip of the filter is located on the tip side of the tip of the caulking fixing portion, and the axial distance between the tip of the outer cylinder member and the tip of the filter is 0.3 mm or less ,
In the front end side of the front end of the caulking fixing portion, the filter is disposed so as to eliminate a gap between the outer cylinder member and the inner cylinder member,
The outer peripheral surface of the filter, the inner peripheral surface of the outer cylindrical member, and the inner peripheral surface of the filter and the outer peripheral surface of the inner cylindrical member are arranged in contact with each other on the distal end side of the distal end of the caulking fixing portion,
The filter is a cylindrical body that covers the periphery of the inner cylindrical member .
前記主体金具は、自身の先端から前記検出部を突出させた状態で、前記センサ素子の径方向周囲を覆い、
前記内筒部材は、前記センサ素子の後端側の径方向周囲を覆うことを特徴とする請求項１または２の何れか一項に記載のセンサ。 The sensor element detects a component to be detected in the gas to be measured by a detection unit formed on the tip side of the sensor element,
The metallic shell covers the circumference in the radial direction of the sensor element in a state in which the detection unit protrudes from its tip.
The sensor according to any one of claims 1 and 2, wherein the inner cylinder member covers a circumference in a radial direction on a rear end side of the sensor element.
前記外筒部材の先端と前記拡径部との軸線方向の距離は０．５ｍｍ以上であることを特徴とする請求項１乃至４の何れか一項に記載のセンサ。 The inner cylinder member connects the small-diameter portion in which the air introduction hole is formed, the large-diameter portion that covers the periphery in the radial direction on the rear end side of the sensor element, and the small-diameter portion and the large-diameter portion. Having an enlarged diameter portion,
The sensor according to any one of claims 1 to 4 , wherein a distance in an axial direction between a tip of the outer cylinder member and the enlarged diameter portion is 0.5 mm or more.
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| WO2013024598A1 (en) * | 2011-08-17 | 2013-02-21 | 日本特殊陶業株式会社 | Gas sensor |
| JP5592336B2 (en) * | 2011-11-16 | 2014-09-17 | 日本特殊陶業株式会社 | Gas sensor |
| CN103827664B (en) * | 2011-11-29 | 2015-10-21 | 日本特殊陶业株式会社 | Gas sensor |
| CN103558277B (en) * | 2013-11-04 | 2015-08-19 | 苏州工业园区传世汽车电子有限公司 | Oxygen sensor for internal combustion engine |
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