JP7803265B2 - connecting pipe - Google Patents
connecting pipeInfo
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- JP7803265B2 JP7803265B2 JP2022204674A JP2022204674A JP7803265B2 JP 7803265 B2 JP7803265 B2 JP 7803265B2 JP 2022204674 A JP2022204674 A JP 2022204674A JP 2022204674 A JP2022204674 A JP 2022204674A JP 7803265 B2 JP7803265 B2 JP 7803265B2
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Description
本発明は、連結管に関する。 The present invention relates to a connecting pipe.
近年の排ガス規制に適応するため、ガソリンで走行する車両の排気管にＧＰＦ（Gasoline Particulate Filter）が組み込まれるようになっている。ＧＰＦは、排ガス中のＰＭ（Particulate matter：粒子状物質）をＰＮ（Particulate Number：ＰＭの粒子数）規制値まで低減するフィルタである。ＧＰＦを始めとするＰＭ捕集フィルタは、捕集されたＰＭによって目詰まりを起こす。そこで、フィルタが目詰まりを起こしたら、フィルタを昇温させて捕集したＰＭを燃焼させ、フィルタを再生することが行われている。フィルタの目詰まりは、フィルタ前後の排ガスの差圧を検出し、検出値を規定値と比較して判定することが知られている。 In order to comply with recent exhaust gas regulations, gasoline-powered vehicles are now incorporating GPFs (Gasoline Particulate Filters) into their exhaust pipes. GPFs are filters that reduce PM (Particulate Matter) in exhaust gases to the PN (Particulate Number) regulatory value. PM collection filters, including GPFs, become clogged with the PM they capture. Therefore, when a filter becomes clogged, the filter is heated to burn the captured PM and regenerate it. A known method of determining filter clogging is to detect the differential pressure of exhaust gas before and after the filter and compare the detected value with a specified value.
フィルタ前後の排ガスの差圧を検出するために、排気管と差圧センサとを連結管で繋ぐ構成が知られている。連結管内の気体中の水分が凝縮して連結管内に水滴が発生し、この水滴が凍結して連結管が閉塞することがある。連結管が閉塞すると、フィルタの目詰まりを正確に判定できないことが生じる。そこで、連結管内が凍結しないよう、水分を誘導可能な誘導溝が内壁に設けられた連結管が知られている（例えば特許文献１）。 A known configuration is to connect the exhaust pipe and differential pressure sensor with a connecting pipe to detect the differential pressure of exhaust gas before and after the filter. Moisture in the gas inside the connecting pipe condenses, forming water droplets inside the connecting pipe. These water droplets can freeze and clog the connecting pipe. If the connecting pipe becomes clogged, it becomes impossible to accurately determine whether the filter is clogged. Therefore, a connecting pipe with a guide groove on the inner wall that can guide moisture to prevent the inside of the connecting pipe from freezing is known (for example, Patent Document 1).
しかしながら、特許文献１に記載の連結管は、内壁に誘導溝を設けるため太くなり易い。このため、連結管の剛性が高くなり、取り回しの制約が大きくなる。 However, the connecting pipe described in Patent Document 1 tends to be thick due to the guide grooves provided on the inner wall. This increases the rigidity of the connecting pipe, placing greater restrictions on its handling.
本発明は、上記課題に鑑みなされたものであり、連結管の閉塞を抑制しつつ、連結管の取り回しの自由度を向上させることを目的とする。 The present invention was developed in consideration of the above-mentioned issues, and aims to improve the flexibility of handling the connecting pipe while preventing blockage of the connecting pipe.
本発明は、排ガス中の粒子状物質を捕集するフィルタが設けられた排気経路と、差圧センサと、を連結する連結管において、前記排気経路から前記排ガスが流入する上流側に位置し、第１の内径を有し、一方の第１端部が前記排気経路に接続し、前記第１端部と他方の第２端部との間で重力方向上側に屈曲して前記第２端部が重力方向上側を向いた金属製の第１配管部と、前記第１配管部より前記排ガスの下流側に位置し、前記第１の内径より大きい第２の内径を有し、前記第１配管部より重力方向上側に位置し、一方の第３端部が前記第２端部に接続し、固定部によりエキゾーストマニホールドに固定された金属製の第２配管部と、を備える連結管である。 The present invention provides a connecting pipe that connects an exhaust path provided with a filter that captures particulate matter in exhaust gas to a differential pressure sensor, the connecting pipe comprising: a first metal piping section that is located upstream of the exhaust path where the exhaust gas flows in from the exhaust path, has a first inner diameter, and is connected to the exhaust path at one first end, and is bent upward in the direction of gravity between the first end and a second end at the other, with the second end facing upward in the direction of gravity; and a second metal piping section that is located downstream of the first piping section in the exhaust gas direction, has a second inner diameter larger than the first inner diameter, is located above the first piping section in the direction of gravity, and is connected to the second end at one third end, and is fixed to an exhaust manifold by a fixing section.
上記構成において、前記第２配管部は、前記第３端部と他方の第４端部との間で屈曲して、前記第４端部側の屈曲先で前記固定部により前記エキゾーストマニホールドに固定され、前記第２配管部における前記第３端部と前記第４端部との間の屈曲部は、前記第１配管部における前記第１端部と前記第２端部との間の屈曲部よりも前記排気経路の近くに位置する構成とすることができる。 In the above configuration, the second piping section is bent between the third end and the other fourth end, and is fixed to the exhaust manifold by the fixing section at the end of the bend on the fourth end side, and the bent section between the third end and the fourth end of the second piping section can be configured to be located closer to the exhaust path than the bent section between the first end and the second end of the first piping section .
上記構成において、前記固定部は、金属製のブラケットである構成とすることができる。 In the above configuration, the fixing portion may be a metal bracket.
本発明によれば、連結管の閉塞を抑制しつつ、連結管の取り回しの自由度を向上させることができる。 This invention makes it possible to prevent blockage of the connecting pipe while improving the flexibility of handling the connecting pipe.
以下、図面を参照して、本願発明の実施例について説明する。 The following describes an embodiment of the present invention with reference to the drawings.
図１は、実施例に係る連結管１００の近傍を例示する図である。図１のように、連結管１００は、排気経路１０と差圧センサ３０とを連結する配管である。排気経路１０は、エンジンから排出された排ガスを外部に向けて排出するためのものであり、エキゾーストマニホールド１２と排気管１４を含んで形成される。エンジンから排出された排ガスは、矢印Ｆのように、エキゾーストマニホールド１２から排気管１４へと流れ込む。 Figure 1 is a diagram illustrating the vicinity of a connecting pipe 100 according to an embodiment. As shown in Figure 1, the connecting pipe 100 is a pipe that connects an exhaust path 10 and a differential pressure sensor 30. The exhaust path 10 is used to discharge exhaust gas emitted from the engine to the outside, and is formed by including an exhaust manifold 12 and an exhaust pipe 14. The exhaust gas emitted from the engine flows from the exhaust manifold 12 into the exhaust pipe 14, as indicated by arrow F.
排気管１４には、ＰＭを捕集するためのフィルタ１６が組み込まれている。フィルタ１６は、例えばＧＰＦである。ＧＰＦでは、セル間の多孔質壁を排ガスが通過する際、排ガス中のＰＭを多孔質壁の表面に堆積して捕集する。捕集されたＰＭによってフィルタ１６に目詰まりが生じた場合、フィルタ１６を昇温させて捕集したＰＭを燃焼させることでフィルタ１６を再生する。 A filter 16 for capturing PM is installed in the exhaust pipe 14. The filter 16 is, for example, a GPF. In a GPF, as exhaust gas passes through the porous walls between cells, PM in the exhaust gas is deposited on the surface of the porous walls and captured. If the filter 16 becomes clogged with the captured PM, the filter 16 is regenerated by raising the temperature of the filter 16 and burning the captured PM.
フィルタ１６の目詰まりは、例えば、フィルタ１６を通過する前の排ガスの圧力と大気の圧力との差圧を検出し、その検出値を規定値と比較することで判定される。このため、排気経路１０と差圧センサ３０とが連結管１００により連結されている。連結管１００は、フィルタ１６よりも排ガスの流れＦに対して上流側に位置する箇所で排気経路１０に接続されている。したがって、フィルタ１６を通過する前の排ガスが排気経路１０から連結管１００に流れ込む。 Clogging of the filter 16 is determined, for example, by detecting the differential pressure between the pressure of the exhaust gas before it passes through the filter 16 and the atmospheric pressure, and comparing this detected value with a specified value. For this reason, the exhaust path 10 and the differential pressure sensor 30 are connected by a connecting pipe 100. The connecting pipe 100 is connected to the exhaust path 10 at a point upstream of the filter 16 in the exhaust gas flow F. Therefore, exhaust gas before it passes through the filter 16 flows from the exhaust path 10 into the connecting pipe 100.
差圧センサ３０は、連結管１００を介してフィルタ１６より上流側における排ガスの圧力を測定するとともに、大気の圧力を測定し、排ガスの圧力と大気の圧力との差圧を検出する。差圧センサ３０の出力はＥＣＵ（Engine Control Unit）５０に入力される。ＥＣＵ５０は、差圧センサ３０が出力した検出値が規定値以上となった場合に、フィルタ１６に目詰まりが発生したと判定する。ＥＣＵ５０は、フィルタ１６に目詰まりが発生したと判定した場合、例えばエンジンの運転中に未燃燃料ガスをフィルタ１６に供給し、フィルタ１６を昇温させてＰＭを燃焼させることで、フィルタ１６を再生する。 The differential pressure sensor 30 measures the exhaust gas pressure upstream of the filter 16 via the connecting pipe 100, as well as the atmospheric pressure, to detect the pressure difference between the exhaust gas pressure and the atmospheric pressure. The output of the differential pressure sensor 30 is input to the ECU (Engine Control Unit) 50. If the detected value output by the differential pressure sensor 30 exceeds a specified value, the ECU 50 determines that the filter 16 has become clogged. If the ECU 50 determines that the filter 16 has become clogged, it regenerates the filter 16, for example, by supplying unburned fuel gas to the filter 16 while the engine is running, raising the temperature of the filter 16 and burning the PM.
連結管１００には、上述したように、排気経路１０から排ガスが流れ込む。連結管１００は、排気経路１０から流れ込む排ガスの流れに対して上流側から順に第１配管部２０、第２配管部２２、および第３配管部２４を備える。第１配管部２０は排気経路１０に接続されている。第３配管部２４は差圧センサ３０に接続されている。第１配管部２０と第３配管部２４との間の第２配管部２２は、例えば鋼、ステンレス、アルミニウム、または銅等の金属製のブラケット等である固定部４０によりエキゾーストマニホールド１２に固定されている。 As described above, exhaust gas flows into the connecting pipe 100 from the exhaust path 10. The connecting pipe 100 comprises, in order from upstream to downstream, a first piping section 20, a second piping section 22, and a third piping section 24 with respect to the flow of exhaust gas flowing in from the exhaust path 10. The first piping section 20 is connected to the exhaust path 10. The third piping section 24 is connected to a differential pressure sensor 30. The second piping section 22 between the first piping section 20 and the third piping section 24 is fixed to the exhaust manifold 12 by a fixing section 40, such as a bracket made of a metal such as steel, stainless steel, aluminum, or copper.
第２配管部２２は、第１配管部２０よりも重力方向上側に位置する。第１配管部２０は、重力方向上側に向かって屈曲部２１で屈曲した後に、第２配管部２２に接続されている。第２配管部２２は、屈曲部２３で屈曲し、屈曲した先で固定部４０によってエキゾーストマニホールド１２に固定されている。第２配管部２２の屈曲部２３は、第１配管部２０の屈曲部２１よりエキゾーストマニホールド１２の近くに位置している。 The second piping section 22 is located higher in the direction of gravity than the first piping section 20. The first piping section 20 is bent upward in the direction of gravity at bend 21 and then connected to the second piping section 22. The second piping section 22 is bent at bend 23 and is fixed to the exhaust manifold 12 at the end of the bend by fixing section 40. The bend 23 of the second piping section 22 is located closer to the exhaust manifold 12 than the bend 21 of the first piping section 20.
図２（ａ）は、実施例に係る連結管１００を例示する図、図２（ｂ）は、連結管１００を構成する第１配管部２０の断面図、図２（ｃ）は、第２配管部２２の断面図、図２（ｄ）は、第３配管部２４の断面図である。図２（ａ）から図２（ｄ）のように、第１配管部２０は一端から他端にかけて内径６０を有する。第１配管部２０の内径６０は比較的小さい。よって、第１配管部２０の剛性は比較的低い。第１配管部２０の内径６０は例えば６．３５ｃｍである。 Figure 2(a) is a diagram illustrating a connecting pipe 100 according to an embodiment, Figure 2(b) is a cross-sectional view of the first piping section 20 that constitutes the connecting pipe 100, Figure 2(c) is a cross-sectional view of the second piping section 22, and Figure 2(d) is a cross-sectional view of the third piping section 24. As shown in Figures 2(a) to 2(d), the first piping section 20 has an inner diameter 60 from one end to the other. The inner diameter 60 of the first piping section 20 is relatively small. Therefore, the rigidity of the first piping section 20 is relatively low. The inner diameter 60 of the first piping section 20 is, for example, 6.35 cm.
第２配管部２２は、一端から他端にかけて内径６２を有する。第２配管部２２の内径６２は、第１配管部２０の内径６０より大きい。例えば、第２配管部２２の内径６２は、８．００ｃｍであり、第１配管部２０の内径６０の約１．２５倍である。第２配管部２２の内径６２が大きいことで、後述するように、第２配管部２２内の気体に含まれる水分が凝縮して水滴が発生したとしても、水滴は流れ落ちやすくなり、第２配管部２２に水滴が留まることが抑制される。 The second piping section 22 has an inner diameter 62 from one end to the other. The inner diameter 62 of the second piping section 22 is larger than the inner diameter 60 of the first piping section 20. For example, the inner diameter 62 of the second piping section 22 is 8.00 cm, which is approximately 1.25 times the inner diameter 60 of the first piping section 20. As described below, even if moisture contained in the gas inside the second piping section 22 condenses to form water droplets, the large inner diameter 62 of the second piping section 22 makes it easier for the water droplets to flow off, preventing them from accumulating in the second piping section 22.
第３配管部２４は、一端から他端にかけて内径６４を有する。第３配管部２４の内径６４は、第２配管部２２の内径６２より大きい。第３配管部２４の内径６４は、例えば第２配管部２２の内径６２の１．２倍以上２．０倍以下である。第１配管部２０と第２配管部２２との間は拡管構造の第１接続配管部２６により接続され、第２配管部２２と第３配管部２４との間は拡管構造の第２接続配管部２８により接続されている。これら、第１配管部２０、第２配管部２２、第３配管部２４、第１接続配管部２６、および第２接続配管部２８は、例えば同じ材料により形成され、例えば鋼、ステンレス、アルミニウム、または銅等の金属により形成されている。 The third piping section 24 has an inner diameter 64 from one end to the other. The inner diameter 64 of the third piping section 24 is larger than the inner diameter 62 of the second piping section 22. The inner diameter 64 of the third piping section 24 is, for example, 1.2 to 2.0 times the inner diameter 62 of the second piping section 22. The first piping section 20 and the second piping section 22 are connected by a first connecting piping section 26 with an expanded pipe structure, and the second piping section 22 and the third piping section 24 are connected by a second connecting piping section 28 with an expanded pipe structure. The first piping section 20, the second piping section 22, the third piping section 24, the first connecting piping section 26, and the second connecting piping section 28 are formed, for example, from the same material, such as steel, stainless steel, aluminum, or copper.
図１に示したように、第２配管部２２は固定部４０によりエキゾーストマニホールド１２に固定されていることから、連結管１００は、排気経路１０に接続する第１配管部２０より大きな内径６２を有する第２配管部２２が固定部４０によりエキゾーストマニホールド１２に固定されている。 As shown in FIG. 1, the second piping section 22 is fixed to the exhaust manifold 12 by the fixing section 40, and therefore the connecting pipe 100 has the second piping section 22, which has a larger inner diameter 62 than the first piping section 20 connected to the exhaust path 10, fixed to the exhaust manifold 12 by the fixing section 40.
［比較例］
図３（ａ）は、比較例に係る連結管５００を例示する図、図３（ｂ）は、連結管５００を構成する第１配管部５１０の断面図、図３（ｃ）は、第２配管部５１２の断面図である。図３（ａ）から図３（ｃ）のように、比較例に係る連結管５００は、排気経路１０に接続された第１配管部５１０と、差圧センサ３０に接続された第２配管部５１２と、を備える。第１配管部５１０と第２配管部５１２が拡管構造の接続配管部５１４により接続されている。第１配管部５１０の内径５１６は比較的小さい。第１配管部５１０の内径５１６は、例えば図２（ｂ）における第１配管部２０の内径６０と同じ大きさである。第２配管部５１２の内径５１８は、第１配管部５１０の内径５１６より大きい。第２配管部５１２の内径５１８は、例えば図２（ｄ）における第３配管部２４の内径６４と同じ大きさである。すなわち、比較例に係る連結管５００は、実施例に係る連結管１００の第２配管部２２に対応する箇所がなく、第２配管部２２に対応する箇所も第１配管部５１０となっている。
[Comparative Example]
FIG. 3( a ) illustrates a connecting pipe 500 according to a comparative example, FIG. 3( b ) is a cross-sectional view of a first pipe section 510 constituting the connecting pipe 500, and FIG. 3( c ) is a cross-sectional view of a second pipe section 512. As shown in FIGS. 3( a ) to 3( c ), the connecting pipe 500 according to the comparative example includes a first pipe section 510 connected to the exhaust path 10 and a second pipe section 512 connected to the differential pressure sensor 30. The first pipe section 510 and the second pipe section 512 are connected by a connecting pipe section 514 having an expanded pipe structure. The inner diameter 516 of the first pipe section 510 is relatively small. The inner diameter 516 of the first pipe section 510 is the same size as the inner diameter 60 of the first pipe section 20 in FIG. 2( b ), for example. The inner diameter 518 of the second pipe section 512 is larger than the inner diameter 516 of the first pipe section 510. The inner diameter 518 of the second piping section 512 is the same size as the inner diameter 64 of the third piping section 24 in Fig. 2(d), for example. In other words, the connecting pipe 500 according to the comparative example does not have a portion corresponding to the second piping section 22 of the connecting pipe 100 according to the example, and the portion corresponding to the second piping section 22 is the first piping section 510.
図４（ａ）は、比較例に係る連結管５００で生じる課題を例示する図、図４（ｂ）は、図４（ａ）の領域Ａの拡大図である。図４（ａ）のように、比較例に係る連結管５００では、第１配管部５１０のうち排気経路１０から排ガスが流れ込む上流側に位置する領域Ｘは比較的高温になるのに対し、領域Ｘよりも下流側に位置する領域Ｙは領域Ｘよりも低温になる。このため、図４（ｂ）のように、第１配管部５１０の領域Ｙにおいて、第１配管部５１０内の気体に含まれる水分が凝縮して水滴７０が発生することがある。水滴７０が第１配管部５１０の領域Ｙで発生してその場に留まると、例えば外気温が低いような場合では水滴７０が凍結して連結管５００が閉塞してしまうことがある。ここで、第１配管部５１０の内径５１６は比較的小さいことから、第１配管部５１０の内壁に発生した水滴７０は反対側の内壁にも接触しやすい。水滴７０が第１配管部５１０の対向する内壁の両方に付着すると、表面張力によって水滴７０全体が第１配管部５１０の内壁に支えられることとなり、水滴７０はその場に留まりやすくなる。したがって、第１配管部５１０の領域Ｙで発生した水滴７０はその場に留まりやすくなる。このため、第１配管部５１０の領域Ｙにおいて水滴７０が凍結して連結管５００が閉塞してしまうことがある。連結管５００が閉塞すると、差圧センサ３０がフィルタ１６より上流側における排ガスの圧力を正確に測定できなくなり、その結果、フィルタ１６の目詰まりを正確に判定できないことがある。 4(a) illustrates an example of a problem that occurs with the connecting pipe 500 according to the comparative example, and FIG. 4(b) is an enlarged view of region A in FIG. 4(a). As shown in FIG. 4(a), in the connecting pipe 500 according to the comparative example, region X of the first piping section 510, located upstream of where exhaust gas flows from the exhaust path 10, is relatively hot, while region Y, located downstream of region X, is colder than region X. Therefore, as shown in FIG. 4(b), moisture contained in the gas within the first piping section 510 may condense and form water droplets 70 in region Y of the first piping section 510. If water droplets 70 form in region Y of the first piping section 510 and remain there, for example, in cases where the outside air temperature is low, the water droplets 70 may freeze and clog the connecting pipe 500. Here, because the inner diameter 516 of the first piping section 510 is relatively small, water droplets 70 that form on the inner wall of the first piping section 510 are likely to come into contact with the inner wall on the opposite side. When water droplets 70 adhere to both opposing inner walls of the first piping section 510, the entire water droplet 70 is supported by the inner walls of the first piping section 510 due to surface tension, and the water droplets 70 tend to remain in place. Therefore, water droplets 70 formed in region Y of the first piping section 510 tend to remain in place. As a result, the water droplets 70 may freeze in region Y of the first piping section 510 and clog the connecting pipe 500. If the connecting pipe 500 becomes clogged, the differential pressure sensor 30 may be unable to accurately measure the pressure of the exhaust gas upstream of the filter 16, and as a result, it may be impossible to accurately determine whether the filter 16 is clogged.
図５（ａ）は、実施例に係る連結管１００による効果を例示する図、図５（ｂ）は、図５（ａ）の領域Ａの拡大図である。図５（ａ）のように、実施例に係る連結管１００では、排気経路１０から排ガスが流れ込む上流側に位置する第１配管部２０は比較的高温になるのに対し、第１配管部２０より排ガスの下流側に位置する第２配管部２２は第１配管部２０よりも低温になる。このため、第２配管部２２において、第２配管部２２内の気体に含まれる水分が凝縮して水滴７０が発生することがある。ここで、第２配管部２２の内径６２は、第１配管部２０の内径６０より大きく、例えば１．２５倍である。このため、図５（ｂ）のように、第２配管部２２の内壁に発生した水滴７０は反対側の内壁に接触するほど大きくなる前に自重によって落下するようになり、第２配管部２２に水滴７０が留まることが抑制される。よって、例えば外気温が低いような場合でも、水滴７０が凍結することが抑制され、連結管１００が閉塞することが抑制される。第２配管部２２に水滴７０が留まることを抑制する点から、第２配管部２２の内径６２は第１配管部２０の内径６０の１．２倍以上が好ましく、１．４倍以上がより好ましく、１．６倍以上が更に好ましい。一方、第２配管部２２が太くなると剛性が高くなり取り扱いが難しくなることから、第２配管部２２の内径６２は第１配管部２０の内径６０の２．０倍以下が好ましく、１．８倍以下がより好ましく、１．６倍以下が更に好ましい。 5(a) illustrates the effect of the connecting pipe 100 according to the embodiment, and FIG. 5(b) is an enlarged view of region A in FIG. 5(a). As shown in FIG. 5(a), in the connecting pipe 100 according to the embodiment, the first pipe section 20, located upstream of the exhaust gas flowing from the exhaust path 10, becomes relatively hot, whereas the second pipe section 22, located downstream of the first pipe section 20 in the exhaust gas flow direction, becomes cooler than the first pipe section 20. Therefore, moisture contained in the gas within the second pipe section 22 may condense and form water droplets 70 in the second pipe section 22. The inner diameter 62 of the second pipe section 22 is larger than the inner diameter 60 of the first pipe section 20, for example, 1.25 times larger. Therefore, as shown in FIG. 5(b), water droplets 70 formed on the inner wall of the second pipe section 22 fall under their own weight before they grow large enough to contact the opposite inner wall, thereby preventing the water droplets 70 from remaining in the second pipe section 22. Therefore, even when the outside air temperature is low, for example, the water droplets 70 are prevented from freezing, and the connecting pipe 100 is prevented from clogging. In order to prevent the water droplets 70 from accumulating in the second piping section 22, the inner diameter 62 of the second piping section 22 is preferably at least 1.2 times the inner diameter 60 of the first piping section 20, more preferably at least 1.4 times, and even more preferably at least 1.6 times. On the other hand, as the second piping section 22 becomes thicker, its rigidity increases and it becomes more difficult to handle, so the inner diameter 62 of the second piping section 22 is preferably no more than 2.0 times the inner diameter 60 of the first piping section 20, more preferably no more than 1.8 times, and even more preferably no more than 1.6 times.
また、第１配管部２０の内径６０が第２配管部２２の内径６２より小さいため、第１配管部２０の剛性は低くなり、第１配管部２０の取り回しの自由度が向上する。このため、図５（ａ）のように、連結管１００の傍に部品８０が配置されるようなレイアウトの場合でも、第１配管部２０を屈曲させて部品８０を回避した取り回しが容易となる。 Furthermore, because the inner diameter 60 of the first piping section 20 is smaller than the inner diameter 62 of the second piping section 22, the rigidity of the first piping section 20 is reduced, improving the flexibility of handling the first piping section 20. Therefore, even in a layout in which a component 80 is placed next to the connecting pipe 100, as shown in Figure 5(a), it is easy to bend the first piping section 20 and handle it around the component 80.
さらに、連結管１００は、図１のように、第２配管部２２が導熱性の固定部４０によりエキゾーストマニホールド１２に固定されている。これにより、第２配管部２２にエキゾーストマニホールド１２の熱が伝わりやすくなり、第２配管部２２の温度を上げることができる。よって、仮に、第２配管部２２において気体に含まれる水分が凝縮して水滴７０が発生しかつその場に留まることがあったとしても、水滴７０が凍結することが抑制される。 Furthermore, as shown in Figure 1, the second piping section 22 of the connecting pipe 100 is fixed to the exhaust manifold 12 by a thermally conductive fixing section 40. This makes it easier for heat from the exhaust manifold 12 to be transferred to the second piping section 22, allowing the temperature of the second piping section 22 to be raised. Therefore, even if moisture contained in the gas in the second piping section 22 condenses to form water droplets 70 that remain in place, the water droplets 70 are prevented from freezing.
以上のように、本実施例によれば、排気経路１０と差圧センサ３０とを連結する連結管１００は、第１配管部２０と第２配管部２２とを備える。第１配管部２０は、排気経路１０から排ガスが流入する上流側に位置し、内径６０（第１の内径）を有する。第２配管部２２は、第１配管部２０より排ガスの下流側に位置し、第１配管部２０の内径６０より大きい内径６２（第２の内径）を有する。第２配管部２２の内径６２が大きいことで、第２配管部２２内に水滴７０が発生したとしても、水滴７０は自重によって落下しやすくなるため、第２配管部２２に水滴７０が留まることが抑制される。よって、連結管１００が閉塞することを抑制できる。第１配管部２０の内径６０が小さいことで、連結管１００の取り回しの自由度を向上させることができる。よって、排気経路１０の側方に部品８０を配置するような場合でも、部品８０の形状の制約が少なくなる。また、第２配管部２２は固定部４０によりエキゾーストマニホールド１２に固定されている。エキゾーストマニホールド１２は高温になることから、第２配管部２２をエキゾーストマニホールド１２に固定することで、第２配管部２２の温度を上げることができる。よって、仮に第２配管部２２において気体に含まれる水分が凝縮して水滴７０が発生しかつその場に留まることがあったとしても、水滴７０が凍結することを抑制できる。 As described above, according to this embodiment, the connecting pipe 100 connecting the exhaust path 10 and the differential pressure sensor 30 includes a first pipe section 20 and a second pipe section 22. The first pipe section 20 is located upstream of the exhaust gas flow from the exhaust path 10 and has an inner diameter 60 (first inner diameter). The second pipe section 22 is located downstream of the exhaust gas flow from the first pipe section 20 and has an inner diameter 62 (second inner diameter) larger than the inner diameter 60 of the first pipe section 20. Because the inner diameter 62 of the second pipe section 22 is large, even if water droplets 70 form in the second pipe section 22, the water droplets 70 tend to fall due to their own weight, preventing the water droplets 70 from accumulating in the second pipe section 22. This prevents the connecting pipe 100 from becoming clogged. The small inner diameter 60 of the first pipe section 20 improves the flexibility of the connecting pipe 100's routing. Therefore, even when the component 80 is placed to the side of the exhaust path 10, there are fewer restrictions on the shape of the component 80. Furthermore, the second piping section 22 is fixed to the exhaust manifold 12 by the fixing section 40. Because the exhaust manifold 12 becomes hot, fixing the second piping section 22 to the exhaust manifold 12 can raise the temperature of the second piping section 22. Therefore, even if moisture contained in the gas in the second piping section 22 condenses to form water droplets 70 that remain in place, the water droplets 70 can be prevented from freezing.
また、本実施例では、第２配管部２２は、第１配管部２０より重力方向上側に位置する。これにより、第２配管部２２に発生した水滴７０は、自重によって第１配管部２０に落下しやすくなる。第１配管部２０は、排気経路１０から排ガスが流れ込む上流側に位置することから比較的高温になるため、第２配管部２２から落ちてきた水滴７０は昇温されて蒸発するようになる。 In addition, in this embodiment, the second piping section 22 is located above the first piping section 20 in the direction of gravity. This makes it easier for water droplets 70 that form in the second piping section 22 to fall to the first piping section 20 due to their own weight. Because the first piping section 20 is located upstream of the exhaust gas flowing in from the exhaust path 10, it becomes relatively hot, and therefore the water droplets 70 that fall from the second piping section 22 are heated and begin to evaporate.
また、本実施例では、第２配管部２２をエキゾーストマニホールド１２に固定する固定部４０は、金属製のブラケットである。これにより、エキゾーストマニホールド１２の熱が固定部４０を介して第２配管部２２に伝わりやすくなり、第２配管部２２の温度が上がりやすくなる。 In addition, in this embodiment, the fixing portion 40 that fixes the second piping portion 22 to the exhaust manifold 12 is a metal bracket. This makes it easier for heat from the exhaust manifold 12 to be transferred to the second piping portion 22 via the fixing portion 40, making it easier for the temperature of the second piping portion 22 to rise.
また、第２配管部２２が固定部４０によりエキゾーストマニホールド１２に固定されていることで、例えばエンジンの振動による応力は第２配管部２２に加わりやすくなる。第２配管部２２は、第１配管部２０より太いことから、第１配管部２０よりも振動に対する強度が高い。このため、第２配管部２２にエンジンの振動による応力が集中したとしても、第２配管部２２に損傷が生じることが抑制される。また、第１配管部２０は、第２配管部２２より細いことから、第２配管部２２よりも剛性が低い。このため、排気経路１０を構成するエキゾーストマニホールド１２および排気管１４に冷熱による収縮が生じた場合、排気経路１０に接続する第１配管部２０が変形することによって収縮による応力を吸収することができる。 Furthermore, because the second piping section 22 is fixed to the exhaust manifold 12 by the fixing section 40, stress due to, for example, engine vibration is more likely to be applied to the second piping section 22. Because the second piping section 22 is thicker than the first piping section 20, it has greater vibration resistance than the first piping section 20. Therefore, even if stress due to engine vibration is concentrated on the second piping section 22, damage to the second piping section 22 is suppressed. Furthermore, because the first piping section 20 is thinner than the second piping section 22, it has lower rigidity than the second piping section 22. Therefore, if the exhaust manifold 12 and exhaust pipe 14 that make up the exhaust path 10 contract due to cold or heat, the first piping section 20 connected to the exhaust path 10 can deform and absorb the stress due to the contraction.
また、図１のように、第１配管部２０は、屈曲部２１で重力方向上側に屈曲して第２配管部２２に接続されている。第２配管部２２は、屈曲部２３で屈曲し、屈曲先で固定部４０によりエキゾーストマニホールド１２に固定されている。第２配管部２２の屈曲部２３は第１配管部２０の屈曲部２１よりも排気経路１０の近くに位置している。これにより、第２配管部２２の屈曲部２３が排気経路１０からの熱を受けて温度が上がるようになり、第２配管部２２において水滴７０が凍結しにくくなる。 As shown in FIG. 1 , the first piping section 20 is bent upward in the direction of gravity at bend 21 and connected to the second piping section 22. The second piping section 22 is bent at bend 23 and fixed to the exhaust manifold 12 at the end of the bend by a fixing section 40. The bend 23 of the second piping section 22 is located closer to the exhaust path 10 than the bend 21 of the first piping section 20. As a result, the bend 23 of the second piping section 22 receives heat from the exhaust path 10, causing the temperature to rise, and water droplets 70 in the second piping section 22 are less likely to freeze.
以上、本発明の実施例について詳述したが、本発明はかかる特定の実施例に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形・変更が可能である。 Although the present invention has been described in detail above with reference to specific embodiments, the present invention is not limited to these specific embodiments, and various modifications and variations are possible within the scope of the invention as set forth in the claims.
１０…排気経路、１２…エキゾーストマニホールド、１４…排気管、１６…フィルタ、２０…第１配管部、２１…屈曲部、２２…第２配管部、２３…屈曲部、２４…第３配管部、２６…第１接続配管部、２８…第２接続配管部、３０…差圧センサ、４０…固定部、５０…ＥＣＵ、６０、６２、６４…内径、７０…水滴、８０…部品、１００…連結管、５００…連結管、５１０…第１配管部、５１２…第２配管部、５１４…接続配管部、５１６、５１８…内径
10...exhaust path, 12...exhaust manifold, 14...exhaust pipe, 16...filter, 20...first piping section, 21...bent section, 22...second piping section, 23...bent section, 24...third piping section, 26...first connecting piping section, 28...second connecting piping section, 30...differential pressure sensor, 40...fixing section, 50...ECU, 60, 62, 64...inner diameter, 70...water droplet, 80...part, 100...connecting pipe, 500...connecting pipe, 510...first piping section, 512...second piping section, 514...connecting piping section, 516, 518...inner diameter
Claims (3)
前記排気経路から前記排ガスが流入する上流側に位置し、第１の内径を有し、一方の第１端部が前記排気経路に接続し、前記第１端部と他方の第２端部との間で重力方向上側に屈曲して前記第２端部が重力方向上側を向いた金属製の第１配管部と、
前記第１配管部より前記排ガスの下流側に位置し、前記第１の内径より大きい第２の内径を有し、前記第１配管部より重力方向上側に位置し、一方の第３端部が前記第２端部に接続し、固定部によりエキゾーストマニホールドに固定された金属製の第２配管部と、を備える連結管。 A connecting pipe connecting an exhaust path provided with a filter that captures particulate matter in exhaust gas and a differential pressure sensor,
a first piping section made of metal, the first piping section being located upstream of the exhaust gas flowing in from the exhaust path, the first piping section having a first inner diameter, one first end connected to the exhaust path, and bent upward in the direction of gravity between the first end and the other second end such that the second end faces upward in the direction of gravity ;
a second piping section made of metal, located downstream of the first piping section in the exhaust gas direction, having a second inner diameter larger than the first inner diameter , located above the first piping section in the direction of gravity, one third end connected to the second end, and fixed to the exhaust manifold by a fixing section.
前記第２配管部における前記第３端部と前記第４端部との間の屈曲部は、前記第１配管部における前記第１端部と前記第２端部との間の屈曲部よりも前記排気経路の近くに位置する、請求項１に記載の連結管。 the second piping portion is bent between the third end and the other fourth end, and is fixed to the exhaust manifold by the fixing portion at a bent end on the fourth end side,
2. The connecting pipe according to claim 1, wherein a bent portion between the third end and the fourth end of the second piping section is located closer to the exhaust path than a bent portion between the first end and the second end of the first piping section .
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