JP6036397B2 - Addition valve support device - Google Patents
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- JP6036397B2 JP6036397B2 JP2013034750A JP2013034750A JP6036397B2 JP 6036397 B2 JP6036397 B2 JP 6036397B2 JP 2013034750 A JP2013034750 A JP 2013034750A JP 2013034750 A JP2013034750 A JP 2013034750A JP 6036397 B2 JP6036397 B2 JP 6036397B2
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Description
本発明は、排気管内に還元剤を噴射する添加弁を同排気管に支持させる添加弁支持装置に関する。 The present invention relates to an addition valve support device that supports an addition valve that injects a reducing agent into an exhaust pipe.
内燃機関の排気系に設けられる排気浄化装置は、排気管内に設けられる触媒と、尿素水などの還元剤を噴射する添加弁とを備えている。こうした添加弁は、例えば特許文献１に記載されるような添加弁支持装置を通じて排気管に支持されている。すなわち、同文献１に記載の装置は添加弁を支持する筒状のハウジングを備えており、ハウジングの軸方向における一端が排気管に固定されている。 An exhaust emission control device provided in an exhaust system of an internal combustion engine includes a catalyst provided in an exhaust pipe and an addition valve that injects a reducing agent such as urea water. Such an addition valve is supported by the exhaust pipe through an addition valve support device as described in Patent Document 1, for example. That is, the apparatus described in the document 1 includes a cylindrical housing that supports the addition valve, and one end of the housing in the axial direction is fixed to the exhaust pipe.
ところで、上記の添加弁支持装置にあっては、添加弁及びハウジングを含むアッセンブリ部品は軸方向における一端が固定端となる一方で他端が自由端となる、いわゆる片持ちで排気管に支持されることとなるため、添加弁の支持剛性を確保しにくい。 By the way, in the above addition valve support device, the assembly part including the addition valve and the housing is supported by the exhaust pipe in a so-called cantilever in which one end in the axial direction is a fixed end and the other end is a free end. Therefore, it is difficult to ensure the support rigidity of the addition valve.
本発明の目的は、排気管に支持される添加弁の支持剛性を高めることができる添加弁支持装置を提供することにある。 The objective of this invention is providing the addition valve support apparatus which can raise the support rigidity of the addition valve supported by an exhaust pipe.
上記課題を解決するための添加弁支持装置は、排気管内に還元剤を噴射する添加弁の少なくとも一部を収容するハウジングと、ハウジングを排気管に連結させる連結フランジと、連結フランジに固定され、ハウジングを連結フランジに取り付ける取り付け手段と、を備えることを前提としている。そして、この添加弁支持装置は、取り付け手段に加え、一端が連結フランジに固定され、他端がハウジングに固定される支持ステーを備えており、取り付け手段がハウジングに固定される固定位置と、支持ステーがハウジングに固定される固定位置とは、同ハウジングの軸方向に離れている。 An addition valve support device for solving the above problem is a housing that houses at least a part of an addition valve that injects a reducing agent into an exhaust pipe, a connection flange that connects the housing to the exhaust pipe, and is fixed to the connection flange. And mounting means for attaching the housing to the connecting flange. In addition to the attachment means, the addition valve support device includes a support stay having one end fixed to the connection flange and the other end fixed to the housing, and a fixing position where the attachment means is fixed to the housing, and a support. The fixed position where the stay is fixed to the housing is separated from the housing in the axial direction.
上記構成では、添加弁を支持するハウジングは、排気管に連結される連結フランジに対して、取り付け手段だけではなく、同取り付け手段とは別に設けられた支持ステーによっても支持されることとなる。しかも、支持ステーがハウジングに固定される位置は、取り付け手段がハウジングに固定される位置からハウジングの軸方向に離れている。このようにハウジングを軸方向に離れた複数箇所で支持するようにしたことにより、排気管に支持される添加弁の支持剛性を高めることができるようになる。
ところで、添加弁の先端には、還元剤を噴射する噴射部が設けられており、この噴射部には、その温度が高くなるほどデポジットが堆積しやすくなる。そのため、添加弁支持装置を、添加弁の噴射部に熱が極力伝達されないように構成することが好ましい。そこで、上記の添加弁支持装置にあっては、ハウジングを連結フランジに触れないように配置し、取り付け手段は、連結フランジに固定され、同連結フランジとハウジングとの間に介在する隙間からの排気の漏出を規制する漏出規制部材を有する。この構成によれば、ハウジングと連結フランジとの間に隙間が介在するようになり、排気からの受熱によって高温となっている連結フランジからハウジングへの直接の伝熱が抑制される。しかも、漏出規制部材によって上記の隙間を介した排気の添加弁支持装置外への漏出が規制される上に、漏出規制部材の肉厚を支持ステーの肉厚よりも薄くすることにより、連結フランジの熱が漏出規制部材よりも支持ステーに伝達されやすくなる。その結果、漏出規制部材には連結フランジから熱が伝わりにくくなる分、同漏出規制部材を介した添加弁の噴射部への熱伝達が抑制され、同噴射部の温度上昇を抑制することができるようになる。したがって、排気管からの排気の漏出を抑制しつつ、添加弁の噴射部の温度上昇を抑制することができるようになる。
なお、ハウジングには、同ハウジングを支持する支持ステーを介して連結フランジからの熱が伝達されることとなる。そこで、支持ステーからハウジングに伝達された熱を添加弁支持装置外に放出させるために、ハウジングの外周に複数の放熱部材を設けている。これにより、ハウジング及び同ハウジングに支持される添加弁の温度上昇を抑制することができるようになる。
また、支持ステーがハウジングに固定される固定位置よりも連結フランジの近くに添加弁の噴射部が位置する態様で添加弁をハウジングが支持している場合、放熱部材を、支持ステーがハウジングに固定される固定位置と漏出規制部材との間に配置する。これにより、添加弁の噴射部には支持ステーからハウジングに伝達された熱が伝達されにくくなり、添加弁の噴射部の温度上昇を抑制することができるようになる。
ここで、漏出規制部材は連結フランジに当接しているため、連結フランジの熱は、支持ステーだけではなく漏出規制部材にも伝達される。そこで、放熱部材のうち、連結フランジの最も近くに位置する特定放熱部材に漏出規制部材を当接させることにより、漏出規制部材の熱を特定放熱部材から外部に速やかに放出させることができるようになる。その結果、漏出規制部材の熱がハウジングに伝達されにくくなり、同ハウジングに支持される添加弁の噴射部の温度上昇を抑制することができるようになる。
また、特定放熱部材の熱容量を、特定放熱部材よりも連結フランジから離れて配置される他の放熱部材の熱容量よりも小さくすることにより、連結フランジの熱が漏出規制部材に伝達されにくくなる。その結果、連結フランジの熱が、径方向において漏出規制部材よりも外側に位置する支持ステーに伝達されやすくなり、熱の伝達経路が添加弁の噴射部から極力離れた位置に形成されやすくなる。したがって、連結フランジの熱を添加弁の噴射部に伝達させにくくすることができるようになる。
In the above configuration, the housing that supports the addition valve is supported not only by the attachment means but also by a support stay provided separately from the attachment means, with respect to the connection flange connected to the exhaust pipe. Moreover, the position where the support stay is fixed to the housing is separated from the position where the attachment means is fixed to the housing in the axial direction of the housing. Thus, by supporting the housing at a plurality of locations separated in the axial direction, the support rigidity of the addition valve supported by the exhaust pipe can be increased.
By the way, an injection part for injecting a reducing agent is provided at the tip of the addition valve, and deposits tend to accumulate in the injection part as the temperature increases. Therefore, it is preferable that the addition valve support device is configured so that heat is not transmitted to the injection portion of the addition valve as much as possible. Therefore, in the addition valve support device described above, the housing is disposed so as not to touch the connecting flange, and the attachment means is fixed to the connecting flange, and exhausted from a gap interposed between the connecting flange and the housing. A leakage restricting member for restricting leakage. According to this configuration, a gap is interposed between the housing and the connecting flange, and direct heat transfer from the connecting flange, which is at a high temperature due to heat received from the exhaust, is suppressed. In addition, the leakage restricting member restricts the leakage of the exhaust gas through the gap to the outside of the addition valve support device, and the thickness of the leakage restricting member is made thinner than the thickness of the support stay, thereby connecting flanges. The heat is more easily transmitted to the support stay than the leakage regulating member. As a result, heat transmission to the injection part of the addition valve via the leakage restriction member is suppressed by the amount that heat is less likely to be transmitted from the connecting flange to the leakage restriction member, and temperature rise of the injection part can be suppressed. It becomes like this. Accordingly, it is possible to suppress the temperature rise of the injection portion of the addition valve while suppressing the leakage of the exhaust gas from the exhaust pipe.
In addition, the heat from a connection flange will be transmitted to a housing via the support stay which supports the housing. Therefore, in order to release the heat transmitted from the support stay to the housing to the outside of the addition valve support device, a plurality of heat radiating members are provided on the outer periphery of the housing. Thereby, the temperature rise of the housing and the addition valve supported by the housing can be suppressed.
Also, when the housing supports the addition valve in a manner in which the injection portion of the addition valve is positioned closer to the connecting flange than the fixed position where the support stay is fixed to the housing, the heat dissipation member is fixed to the housing. It arrange | positions between the fixed position and leakage control member. As a result, the heat transmitted from the support stay to the housing becomes difficult to be transmitted to the injection portion of the addition valve, and the temperature rise of the injection portion of the addition valve can be suppressed.
Here, since the leakage regulating member is in contact with the connecting flange, the heat of the connecting flange is transmitted not only to the support stay but also to the leakage regulating member. Therefore, by bringing the leakage restricting member into contact with the specific heat dissipating member located closest to the connecting flange among the heat dissipating members, the heat of the leakage restricting member can be quickly released from the specific heat dissipating member to the outside. Become. As a result, the heat of the leakage regulating member is hardly transmitted to the housing, and the temperature rise of the injection portion of the addition valve supported by the housing can be suppressed.
In addition, by making the heat capacity of the specific heat radiating member smaller than the heat capacity of other heat radiating members arranged farther from the connecting flange than the specific heat radiating member, the heat of the connecting flange is hardly transmitted to the leakage regulating member. As a result, the heat of the connecting flange is easily transmitted to the support stay positioned outside the leakage restricting member in the radial direction, and the heat transmission path is easily formed at a position as far as possible from the injection portion of the addition valve. Therefore, it becomes possible to make it difficult to transfer the heat of the connecting flange to the injection portion of the addition valve.
また、上記の添加弁支持装置において、支持ステーは、ハウジング及び添加弁を含むアッセンブリ部品の重心位置でハウジングに固定されることが好ましい。この構成によれば、支持ステーがハウジングに固定される固定位置が軸方向においてアッセンブリ部品の重心位置と同一位置となるため、アッセンブリ部品の重心位置が変位しにくくなり、排気管に支持される添加弁の支持剛性を高めることができるようになる。 In the addition valve support device described above, the support stay is preferably fixed to the housing at the position of the center of gravity of the assembly component including the housing and the addition valve. According to this configuration, the fixing position at which the support stay is fixed to the housing is the same position as the center of gravity of the assembly part in the axial direction. The support rigidity of the valve can be increased.
また、上記の添加弁支持装置は、上記アッセンブリ部品の重心位置よりも連結フランジに近い位置で取り付け手段をハウジングに固定させ、上記アッセンブリ部品の重心位置よりも連結フランジから離れた位置で支持ステーをハウジングに固定させるようにしてもよい。この場合、ハウジングの軸方向において、取り付け手段がハウジングに固定される固定位置と支持ステーがハウジングに固定される固定位置との間隔を広げることが可能となり、排気管に支持される添加弁の支持剛性を高めることができるようになる。また、連結フランジを介して排気管に連結される取り付け手段の固定位置から連結フランジとは反対側に離れた位置に支持ステーを固定するほど、取り付け手段の固定位置を支点とする上記アッセンブリ部品の振動を効果的に抑制することができる。この点、上記の添加弁装置は、アッセンブリ部品の重心位置よりも連結フランジから離れた位置で支持ステーがハウジングに固定されている。さらに、重心位置よりも振動の支点から離れた位置で支持ステーがハウジングに固定される構成にもなっているため、連結フランジ側に支点を有するハウジングの振動を効果的に抑制することができ、添加弁の支持剛性を高めることができるようになる。 Further, the addition valve support device fixes the mounting means to the housing at a position closer to the connecting flange than the center of gravity position of the assembly part, and the support stay at a position farther from the connection flange than the center of gravity position of the assembly part. You may make it fix to a housing. In this case, in the axial direction of the housing, it is possible to widen the interval between the fixed position where the attachment means is fixed to the housing and the fixed position where the support stay is fixed to the housing, and the support of the addition valve supported by the exhaust pipe The rigidity can be increased. Further, as the support stay is fixed at a position away from the connecting flange from the fixing position of the attaching means connected to the exhaust pipe via the connecting flange, the assembly part having the fixing position of the attaching means as a fulcrum is used. Vibration can be effectively suppressed. In this respect, in the addition valve device, the support stay is fixed to the housing at a position farther from the coupling flange than the position of the center of gravity of the assembly component. Furthermore, since the support stay is also fixed to the housing at a position farther from the vibration fulcrum than the position of the center of gravity, the vibration of the housing having the fulcrum on the connecting flange side can be effectively suppressed. Support rigidity of the addition valve can be increased.
また、上記の添加弁支持装置において、放熱部材は、径方向に延出する放熱用フランジを有し、放熱用フランジに支持ステーが挿通する挿通部を形成することが好ましい。これによれば、支持ステーを、径方向において放熱用フランジの周縁よりも添加弁の近くに配置することができるため、添加弁支持装置の大型化を抑制することができるようになる。 In the addition valve support device, it is preferable that the heat radiating member has a heat radiating flange extending in a radial direction, and an insertion portion through which the support stay is inserted is formed in the heat radiating flange. According to this, since the support stay can be disposed closer to the addition valve than the peripheral edge of the heat dissipating flange in the radial direction, the increase in size of the addition valve support device can be suppressed.
以下、添加弁を排気管に支持させる添加弁支持装置を具体化した一実施形態を図１〜図５に従って説明する。
図１に示すように、排気浄化装置１１は、内燃機関の排気管１２内に配置される排気浄化用の触媒１３と、この触媒１３よりも排気上流の排気管１２内に還元剤の一例である尿素水を噴射する添加弁１４とを備えている。この添加弁１４は、添加弁支持装置２０によって排気管１２に支持されている。
Hereinafter, an embodiment embodying an addition valve support device for supporting an addition valve on an exhaust pipe will be described with reference to FIGS.
As shown in FIG. 1, the exhaust purification device 11 is an example of a reducing agent disposed in an exhaust purification catalyst 13 disposed in an exhaust pipe 12 of an internal combustion engine and an exhaust pipe 12 upstream of the catalyst 13. And an addition valve 14 for injecting certain urea water. The addition valve 14 is supported on the exhaust pipe 12 by an addition valve support device 20.
排気浄化装置１１は、内燃機関の排気管１２を流れる排気に含まれる窒素酸化物を還元する装置である。すなわち、添加弁１４から排気管１２内に噴射された尿素水に含まれる水分は、排気管１２内を流れる排気と共に排気下流に流動する過程で蒸発する。そして、蒸発した水分（水蒸気）と尿素水に含まれる尿素とが反応する加水分解によりアンモニアガスが排気管１２内に発生する。このように発生したアンモニアガスは、排気とともに触媒１３に取り込まれ、この触媒１３に取り込まれた排気に含まれる窒素酸化物が、排気と共に触媒１３に取り込まれたアンモニアガスによって水及び窒素に還元される。 The exhaust purification device 11 is a device that reduces nitrogen oxides contained in the exhaust flowing through the exhaust pipe 12 of the internal combustion engine. That is, moisture contained in the urea water injected from the addition valve 14 into the exhaust pipe 12 evaporates in the process of flowing downstream with the exhaust flowing through the exhaust pipe 12. Then, ammonia gas is generated in the exhaust pipe 12 by hydrolysis in which evaporated water (water vapor) reacts with urea contained in the urea water. The ammonia gas thus generated is taken into the catalyst 13 together with the exhaust gas, and the nitrogen oxides contained in the exhaust gas taken into the catalyst 13 are reduced to water and nitrogen by the ammonia gas taken into the catalyst 13 together with the exhaust gas. The
次に、図２〜図４を参照して、添加弁支持装置２０について詳述する。
図２及び図３に示すように、添加弁支持装置２０は、ボルトなどの連結具によって排気管１２に連結される連結フランジ２１と、添加弁１４を支持する円筒状のハウジング２２と、連結フランジ２１とハウジング２２とを連結する複数の支持ステー２３とを備えている。連結フランジ２１は、ハウジング２２を排気管１２に連結させるものである。
Next, the addition valve support device 20 will be described in detail with reference to FIGS.
2 and 3, the addition valve support device 20 includes a connection flange 21 connected to the exhaust pipe 12 by a connector such as a bolt, a cylindrical housing 22 that supports the addition valve 14, and a connection flange. And a plurality of support stays 23 that connect the housing 21 and the housing 22. The connecting flange 21 connects the housing 22 to the exhaust pipe 12.
ハウジング２２は、連結フランジ２１から離れる方向に延伸するとともに、軸方向における連結フランジ２１に近い側の端部（図３では下端）が連結フランジ２１に触れないように配置されている。例えば、ハウジング２２は、軸方向において連結フランジ２１よりも排気管１２から離れて配置されている。 The housing 22 extends in a direction away from the connection flange 21 and is disposed so that an end portion (a lower end in FIG. 3) near the connection flange 21 in the axial direction does not touch the connection flange 21. For example, the housing 22 is disposed farther from the exhaust pipe 12 than the connecting flange 21 in the axial direction.
また、ハウジング２２は、第１径部２２１、第２径部２２２、第３径部２２３を有している。第１径部２２１、第２径部２２２、第３径部２２３は、連結フランジ２１に近い側から第３径部２２３、第２径部２２２、第１径部２２１の順に並んでいる。第１径部２２１の内径は第２径部２２２及び第３径部２２３の内径よりも大きく、第２径部２２２の内径は第３径部２２３の内径よりも大きくなっている。このため、第１径部２２１と第２径部２２２との間には段差２２４が形成され、この段差２２４には円盤状の支持部材２４が設けられている。そして、ハウジング２２は、その内部に収容されている添加弁１４を支持部材２４を通じて支持しており、添加弁１４の先端に設けられている尿素水の噴射部１４１は、ハウジング２２の第３径部２２３内に位置している。なお、第２径部２２２の周壁と添加弁１４との間には膨張黒鉛シートからなるシール部材２５Ａが設けられ、第３径部２２３の周壁と添加弁１４との間にはゴム製のシール部材２５Ｂが設けられている。 The housing 22 has a first diameter part 221, a second diameter part 222, and a third diameter part 223. The first diameter portion 221, the second diameter portion 222, and the third diameter portion 223 are arranged in the order of the third diameter portion 223, the second diameter portion 222, and the first diameter portion 221 from the side close to the connecting flange 21. The inner diameter of the first diameter part 221 is larger than the inner diameters of the second diameter part 222 and the third diameter part 223, and the inner diameter of the second diameter part 222 is larger than the inner diameter of the third diameter part 223. For this reason, a step 224 is formed between the first diameter portion 221 and the second diameter portion 222, and a disc-shaped support member 24 is provided at the step 224. The housing 22 supports the addition valve 14 accommodated therein through a support member 24, and the urea water injection portion 141 provided at the tip of the addition valve 14 is a third diameter of the housing 22. It is located in the part 223. A seal member 25A made of an expanded graphite sheet is provided between the peripheral wall of the second diameter portion 222 and the addition valve 14, and a rubber seal is provided between the peripheral wall of the third diameter portion 223 and the addition valve 14. A member 25B is provided.
また、ハウジング２２の第１径部２２１には、ハウジング２２に支持されている添加弁１４が連結フランジ２１から離れる方向（図３では上側）に変位することを規制する変位規制部材２６が設けられている。この変位規制部材２６は、図２における添加弁１４の上端に載置される本体部２６１と、この本体部２６１から図２における下方に延伸する一対の延伸部２６２とを有しており、一対の延伸部２６２の先端がハウジング２２に固定されている。 The first diameter portion 221 of the housing 22 is provided with a displacement regulating member 26 that regulates displacement of the addition valve 14 supported by the housing 22 in a direction away from the connection flange 21 (upper side in FIG. 3). ing. The displacement regulating member 26 has a main body portion 261 placed on the upper end of the addition valve 14 in FIG. 2 and a pair of extending portions 262 extending downward from the main body portion 261 in FIG. The tip of the extending portion 262 is fixed to the housing 22.
また、ハウジング２２の第２径部２２２の外周には、ハウジング２２の軸方向に並ぶ４つの放熱部材２７Ａ，２７Ｂ，２７Ｃ，２７Ｄが設けられている。これら放熱部材２７Ａ〜２７Ｄはハウジング２２が挿通される円筒状の被支持部２７１を有し、被支持部２７１にはその軸方向における一端（図３では下端）から径方向外側に延出する放熱用フランジ２７２が一体形成されている。そして、放熱部材２７Ａ〜２７Ｄは、その被支持部２７１の内周面がハウジング２２の外周面に密接した状態で同ハウジング２２に固定されている。また、放熱部材２７Ａ〜２７Ｄの放熱用フランジ２７２には、空気が流通可能な多数の通気孔２７３と、支持ステー２３が挿通される挿通部としてのステー挿通孔２７４とが軸方向に貫通形成されている。このようにステー挿通孔２７４を放熱用フランジ２７２に設けることにより、支持ステー２３と放熱部材２７Ａ〜２７Ｄとの当接が回避される。 Further, on the outer periphery of the second diameter portion 222 of the housing 22, four heat radiating members 27 </ b> A, 27 </ b> B, 27 </ b> C, and 27 </ b> D arranged in the axial direction of the housing 22 are provided. These heat radiation members 27A to 27D have a cylindrical supported portion 271 through which the housing 22 is inserted, and the supported portion 271 has a heat radiation extending radially outward from one end in the axial direction (lower end in FIG. 3). The flange 272 for use is integrally formed. The heat dissipating members 27 </ b> A to 27 </ b> D are fixed to the housing 22 with the inner peripheral surface of the supported portion 271 being in close contact with the outer peripheral surface of the housing 22. Further, the heat radiation flanges 272 of the heat radiation members 27 </ b> A to 27 </ b> D are formed with a large number of ventilation holes 273 through which air can flow and stay insertion holes 274 as insertion parts through which the support stays 23 are inserted in the axial direction. ing. By providing the stay insertion hole 274 in the heat radiating flange 272 in this manner, contact between the support stay 23 and the heat radiating members 27A to 27D is avoided.
なお、放熱部材２７Ａ〜２７Ｄは板材を加工することで形成されている。本実施形態では、放熱部材２７Ａ〜２７Ｄのうち、最も連結フランジ２１の近くに配置される特定放熱部材としての放熱部材２７Ｄは、他の放熱部材２７Ａ〜２７Ｃを形成する板材よりも薄い板材によって形成されている。例えば、放熱部材２７Ｄを形成する板材の肉厚は、他の放熱部材２７Ａ〜２７Ｃを形成する板材の肉厚の半分程度である。 The heat radiating members 27A to 27D are formed by processing a plate material. In the present embodiment, among the heat radiating members 27A to 27D, the heat radiating member 27D as the specific heat radiating member disposed closest to the connecting flange 21 is formed by a plate material thinner than the plate material forming the other heat radiating members 27A to 27C. Has been. For example, the thickness of the plate material forming the heat radiating member 27D is about half the thickness of the plate material forming the other heat radiating members 27A to 27C.
また、添加弁１４、ハウジング２２、変位規制部材２６及び各放熱部材２７Ａ〜２７Ｄを含むアッセンブリ部品ＡＳの重心位置は、図３にて点Ｇで示す位置に設定されている。各支持ステー２３は、アッセンブリ部品ＡＳの重心位置に対応する軸方向位置においてハウジング２２の外周面に接合されている。 Further, the position of the center of gravity of the assembly component AS including the addition valve 14, the housing 22, the displacement regulating member 26, and the heat radiation members 27A to 27D is set to a position indicated by a point G in FIG. Each support stay 23 is joined to the outer peripheral surface of the housing 22 at an axial position corresponding to the position of the center of gravity of the assembly component AS.
支持ステー２３は、短冊状をなす板材によって形成されており、周方向に沿って間隔を空けて４つ配置されている。支持ステー２３は、連結フランジ２１から垂直に、排気管１２から離れる方向（図３では上方向）に延びている。そして、支持ステー２３の先端（図３では上端）には、溶接やロウ付けなどによってハウジング２２に接合される被接合部２３１が設けられている。この被接合部２３１の軸方向位置が、支持ステー２３がハウジング２２に固定される固定位置に相当する。なお、連結フランジ２１において支持ステー２３が固定される部分にはスリット２１１が形成されており、支持ステー２３の基端２３２（図３では下端）が連結フランジ２１のスリット２１１内に嵌入され、ロウ付けなどによって接合されている。 The support stays 23 are formed of a strip-shaped plate material, and four support stays 23 are arranged at intervals along the circumferential direction. The support stay 23 extends vertically from the connection flange 21 in a direction away from the exhaust pipe 12 (upward in FIG. 3). At the tip of the support stay 23 (the upper end in FIG. 3), a joined portion 231 to be joined to the housing 22 by welding or brazing is provided. The axial position of the joined portion 231 corresponds to a fixed position where the support stay 23 is fixed to the housing 22. Note that a slit 211 is formed in a portion of the connecting flange 21 where the support stay 23 is fixed, and a base end 232 (lower end in FIG. 3) of the support stay 23 is fitted into the slit 211 of the connecting flange 21, It is joined by attaching.
図４に示すように、連結フランジ２１には、ハウジング２２に支持されている添加弁１４の噴射部１４１から噴射された尿素水が通過する貫通孔２１２が形成されている。この貫通孔２１２は、小径部２１３と、軸方向において小径部２１３よりもハウジング２２の近くに位置し且つ通路断面積が小径部２１３よりも僅かに広い大径部２１４とを有している。この貫通孔２１２の小径部２１３には、筒状の突出部材２８の基端（図３では下端）が接合されている。この突出部材２８は、連結フランジ２１内からハウジング２２の端部まで突出しており、突出部材２８の先端（図３では上端）に形成されている開口部２８１内にハウジング２２の端部が位置している。 As shown in FIG. 4, the connecting flange 21 is formed with a through hole 212 through which urea water injected from the injection portion 141 of the addition valve 14 supported by the housing 22 passes. The through-hole 212 has a small-diameter portion 213 and a large-diameter portion 214 that is positioned closer to the housing 22 than the small-diameter portion 213 in the axial direction and has a slightly larger passage cross-sectional area than the small-diameter portion 213. The base end (lower end in FIG. 3) of the cylindrical projecting member 28 is joined to the small diameter portion 213 of the through hole 212. The projecting member 28 projects from the inside of the coupling flange 21 to the end of the housing 22, and the end of the housing 22 is positioned in the opening 281 formed at the tip (upper end in FIG. 3) of the projecting member 28. ing.
なお、本実施形態の突出部材２８では、ハウジング２２側の開口部２８１の通路断面積が連結フランジ２１側の開口部２８２の通路断面積よりも狭くなっている。突出部材２８がこうした形状であっても、突出部材２８のハウジング２２側の開口部２８１の内径はハウジング２２の第３径部２２３の外径よりも大きいため、突出部材２８はハウジング２２に触れていない。すなわち、ハウジング２２の第３径部２２３と突出部材２８との間には全周に亘って僅かな隙間ＳＰが形成されている。 In the protruding member 28 of the present embodiment, the passage sectional area of the opening 281 on the housing 22 side is narrower than the passage sectional area of the opening 282 on the connecting flange 21 side. Even if the protruding member 28 has such a shape, since the inner diameter of the opening 281 on the housing 22 side of the protruding member 28 is larger than the outer diameter of the third diameter portion 223 of the housing 22, the protruding member 28 touches the housing 22. Absent. That is, a slight gap SP is formed over the entire circumference between the third diameter portion 223 of the housing 22 and the protruding member 28.
また、突出部材２８の径方向外側であって且つ上記スリット２１１の径方向内側には、上記隙間ＳＰを通じての排気管１２内からの排気の漏出を規制する漏出規制部材２９が設けられている。この漏出規制部材２９は、支持ステー２３を形成する板材よりも薄い板材によって形成される部材であって、軸方向一端（図３では下端）が連結フランジ２１に固定される筒状部２９１と、筒状部２９１の軸方向他端（図３では上端）から径方向外側に延出する規制用フランジ２９２とを有している。 Further, a leakage restricting member 29 for restricting the leakage of exhaust gas from the exhaust pipe 12 through the gap SP is provided on the radially outer side of the protruding member 28 and on the radially inner side of the slit 211. The leakage regulating member 29 is a member formed of a plate material thinner than the plate material forming the support stay 23, and has a cylindrical portion 291 in which one end in the axial direction (the lower end in FIG. 3) is fixed to the connecting flange 21, It has a regulating flange 292 extending radially outward from the other axial end of the cylindrical portion 291 (the upper end in FIG. 3).
漏出規制部材２９の筒状部２９１の軸方向一端は、貫通孔２１２の大径部２１４の周壁と突出部材２８との間に形成される隙間内に嵌入されている。また、漏出規制部材２９の規制用フランジ２９２は、放熱部材２７Ａ〜２７Ｄのうち最も連結フランジ２１の近くに配置される放熱部材２７Ｄの放熱用フランジ２７２に密接している。そして、本実施形態では、放熱部材２７Ｄ及び漏出規制部材２９によって、ハウジング２２の第３径部２２３の外周側に、隙間ＳＰを通じて排気管１２の内部に連通する密閉空間３０が形成される。これにより、隙間ＳＰを通じての添加弁支持装置２０外への排気の漏出が規制される。したがって、本実施形態では、放熱部材２７Ｄ及び漏出規制部材２９により、添加弁１４を収容するハウジング２２を連結フランジ２１に取り付ける「取り付け手段」が構成される。 One end in the axial direction of the cylindrical portion 291 of the leakage regulating member 29 is fitted in a gap formed between the peripheral wall of the large diameter portion 214 of the through hole 212 and the protruding member 28. Further, the restriction flange 292 of the leakage restriction member 29 is in close contact with the heat radiation flange 272 of the heat radiation member 27D disposed closest to the connection flange 21 among the heat radiation members 27A to 27D. In the present embodiment, a sealed space 30 communicating with the inside of the exhaust pipe 12 through the gap SP is formed on the outer peripheral side of the third diameter portion 223 of the housing 22 by the heat radiating member 27D and the leakage regulating member 29. Thereby, the leakage of the exhaust gas to the outside of the addition valve support device 20 through the gap SP is restricted. Therefore, in this embodiment, the “radiating member” and the leakage restricting member 29 constitute “attaching means” for attaching the housing 22 accommodating the addition valve 14 to the connecting flange 21.
なお、漏出規制部材２９の規制用フランジ２９２には、放熱部材２７Ｄの放熱用フランジ２７２の通気孔２７３に連通する通気孔２９３が形成されるとともに、ステー挿通孔２７４に連通するステー挿通孔２９４が形成されている。 The restriction flange 292 of the leakage restriction member 29 is formed with a vent hole 293 that communicates with the vent hole 273 of the heat dissipation flange 272 of the heat dissipation member 27D, and a stay insertion hole 294 that communicates with the stay insertion hole 274. Is formed.
次に、図５を参照して、排気管１２内を排気が流れる際の作用について説明する。
図５に示すように、排気管１２を流れる排気からの受熱によって高温となっている連結フランジ２１からは、同連結フランジ２１に当接している部材に熱が伝達される。本実施形態では、連結フランジ２１には、漏出規制部材２９と各支持ステー２３とが当接している。支持ステー２３は、漏出規制部材２９を形成する板材よりも肉厚の板材によって形成されているため、その熱容量が漏出規制部材２９の熱容量よりも大きい。
Next, with reference to FIG. 5, the action when the exhaust gas flows through the exhaust pipe 12 will be described.
As shown in FIG. 5, heat is transmitted from the connection flange 21, which is at a high temperature due to heat received from the exhaust gas flowing through the exhaust pipe 12, to a member that is in contact with the connection flange 21. In the present embodiment, the leakage restricting member 29 and each support stay 23 are in contact with the connecting flange 21. Since the support stay 23 is formed of a plate material thicker than the plate material forming the leakage regulating member 29, the heat capacity thereof is larger than the heat capacity of the leakage regulating member 29.
そのため、連結フランジ２１の熱は、径方向において漏出規制部材２９よりも外側に位置している支持ステー２３に伝達されやすい。このとき、支持ステー２３は各放熱部材２７Ａ〜２７Ｄ及び漏出規制部材２９に当接していないため、支持ステー２３に伝達された熱は、被接合部２３１を通じてハウジング２２に伝達される。なお、支持ステー２３に伝達された熱の一部は、支持ステー２３の基端から被接合部２３１に向かう過程で外気に放出される。 Therefore, the heat of the connecting flange 21 is easily transmitted to the support stay 23 located outside the leakage restricting member 29 in the radial direction. At this time, since the support stay 23 is not in contact with the heat radiating members 27 </ b> A to 27 </ b> D and the leakage regulating member 29, the heat transmitted to the support stay 23 is transmitted to the housing 22 through the joined portion 231. A part of the heat transmitted to the support stay 23 is released to the outside air in the process from the base end of the support stay 23 toward the joined portion 231.
そして、ハウジング２２では、支持ステー２３から伝達された熱が、支持ステー２３がハウジング２２に固定される固定位置からハウジング２２の各部に伝達される。したがって、図５における下方、すなわち、添加弁１４の噴射部１４１に向けても熱が伝達されることになる。しかし、軸方向において上記固定位置よりも連結フランジ２１に近い位置には、複数の放熱部材２７Ａ〜２７Ｄが設けられている。そのため、上記固定位置から連結フランジ２１に向かう熱は放熱部材２７Ａ〜２７Ｄによって外部に放出されるため、ハウジング２２に支持される添加弁１４の噴射部１４１への熱の伝達は抑制される。 In the housing 22, the heat transmitted from the support stay 23 is transmitted to each part of the housing 22 from a fixed position where the support stay 23 is fixed to the housing 22. Accordingly, heat is transmitted also downward in FIG. 5, that is, toward the injection portion 141 of the addition valve 14. However, a plurality of heat dissipating members 27 </ b> A to 27 </ b> D are provided at positions closer to the connecting flange 21 than the fixed position in the axial direction. Therefore, heat from the fixed position toward the connection flange 21 is released to the outside by the heat radiating members 27 </ b> A to 27 </ b> D, and therefore, heat transmission to the injection portion 141 of the addition valve 14 supported by the housing 22 is suppressed.
また、漏出規制部材２９及び突出部材２８にも、支持ステー２３ほどではなくても連結フランジ２１から熱が伝達される。このように漏出規制部材２９及び突出部材２８に伝達された熱は、漏出規制部材２９の規制用フランジ２９２に密接している放熱部材２７Ｄの放熱用フランジ２７２に伝達されて同放熱用フランジ２７２から放出される。また、添加弁１４の噴射部１４１が収容されているハウジング２２の第３径部２２３と突出部材２８との間には全周に亘って僅かな隙間ＳＰが形成されているため、突出部材２８からハウジング２２の第３径部２２３及び噴射部１４１に直接熱が伝達されることはない。そのため、漏出規制部材２９及び突出部材２８の熱がハウジング２２に伝達されることが抑制され、このハウジング２２に支持される添加弁１４の噴射部１４１の温度上昇が抑制される。 Further, the heat is transmitted from the coupling flange 21 to the leakage regulating member 29 and the protruding member 28 even if not as much as the support stay 23. The heat transmitted to the leakage restricting member 29 and the protruding member 28 in this way is transmitted to the heat dissipating flange 272 of the heat dissipating member 27D that is in close contact with the restricting flange 292 of the leak restricting member 29, and from the heat dissipating flange 272. Released. Further, since a slight gap SP is formed over the entire circumference between the third diameter portion 223 of the housing 22 in which the injection portion 141 of the addition valve 14 is accommodated and the protruding member 28, the protruding member 28. Therefore, heat is not directly transferred from the third diameter portion 223 of the housing 22 to the injection portion 141. For this reason, the heat of the leakage regulating member 29 and the protruding member 28 is suppressed from being transmitted to the housing 22, and the temperature rise of the injection portion 141 of the addition valve 14 supported by the housing 22 is suppressed.
上述した構成及び作用により、本実施形態では、以下に示す効果を得ることができる。
（１）添加弁１４を支持するハウジング２２は、軸方向に離れた複数箇所で排気管１２に支持されている。そのため、ハウジング２２がその軸方向における一端のみで排気管１２に片持ち支持される場合と比較して、排気管１２に支持される添加弁１４の支持剛性を高めることができる。
With the configuration and operation described above, in the present embodiment, the following effects can be obtained.
(1) The housing 22 that supports the addition valve 14 is supported by the exhaust pipe 12 at a plurality of locations separated in the axial direction. Therefore, the support rigidity of the addition valve 14 supported by the exhaust pipe 12 can be increased as compared with the case where the housing 22 is cantilevered by the exhaust pipe 12 only at one end in the axial direction.
（２）添加弁１４及びハウジング２２を含むアッセンブリ部品ＡＳは、その重心位置で支持ステー２３に支持されている。そのため、アッセンブリ部品ＡＳの重心位置が変位しにくくなり、添加弁１４の支持剛性を高めることができる。 (2) The assembly part AS including the addition valve 14 and the housing 22 is supported by the support stay 23 at the center of gravity. Therefore, the position of the center of gravity of the assembly part AS is not easily displaced, and the support rigidity of the addition valve 14 can be increased.
（３）ハウジング２２と、連結フランジ２１に設けられている突出部材２８との間には、隙間ＳＰが介在しているため、排気からの受熱によって高温となる連結フランジ２１から添加弁１４の噴射部１４１が収容されているハウジング２２の第３径部２２３への直接の伝熱が抑制される。しかも、漏出規制部材２９によって上記の隙間ＳＰを介した排気の外部への漏出が規制される上に、漏出規制部材２９の肉厚を支持ステー２３の肉厚よりも薄くすることにより、連結フランジ２１の熱が漏出規制部材２９よりも支持ステー２３に伝達されやすくなる。その結果、漏出規制部材２９には連結フランジ２１から熱が伝わりにくくなる分、漏出規制部材２９を介した添加弁１４の噴射部１４１への熱伝達が抑制される。したがって、排気管１２からの排気の漏出を抑制しつつ、添加弁１４の噴射部１４１の温度上昇に起因する噴射部１４１へのデポジットの堆積を抑制することができる。 (3) Since the gap SP is interposed between the housing 22 and the protruding member 28 provided on the connecting flange 21, the injection of the addition valve 14 from the connecting flange 21 that becomes high temperature due to heat received from the exhaust. Direct heat transfer to the third diameter portion 223 of the housing 22 in which the portion 141 is accommodated is suppressed. In addition, the leakage restricting member 29 restricts the leakage of the exhaust gas to the outside through the gap SP, and the thickness of the leakage restricting member 29 is made thinner than the thickness of the support stay 23, thereby connecting flanges. The heat of 21 is more easily transmitted to the support stay 23 than the leakage regulating member 29. As a result, heat transfer to the injection part 141 of the addition valve 14 via the leakage restriction member 29 is suppressed by the amount that heat is less likely to be transmitted from the connecting flange 21 to the leakage restriction member 29. Therefore, deposit accumulation on the injection unit 141 due to a temperature rise of the injection unit 141 of the addition valve 14 can be suppressed while suppressing leakage of exhaust gas from the exhaust pipe 12.
（４）また、ハウジング２２の外周に放熱部材２７Ａ〜２７Ｄを設けることにより、支持ステー２３からハウジング２２に伝達された熱を、放熱部材２７Ａ〜２７Ｄから外部に放出することができる。そのため、ハウジング２２及びハウジング２２に支持される添加弁１４の温度上昇を抑制することができる。 (4) Further, by providing the heat radiation members 27A to 27D on the outer periphery of the housing 22, the heat transmitted from the support stay 23 to the housing 22 can be released from the heat radiation members 27A to 27D to the outside. Therefore, the temperature rise of the housing 22 and the addition valve 14 supported by the housing 22 can be suppressed.
（５）また、放熱部材２７Ｄには漏出規制部材２９が密接しているため、連結フランジ２１から漏出規制部材２９に伝達された熱を、放熱部材２７Ｄから外部に放出することができる。そのため、漏出規制部材２９の熱がハウジング２２に伝達されにくくなり、ハウジング２２に支持される添加弁１４の噴射部１４１の温度上昇を抑制することができる。 (5) Further, since the leakage restricting member 29 is in close contact with the heat radiating member 27D, the heat transmitted from the connecting flange 21 to the leakage restricting member 29 can be released from the heat radiating member 27D to the outside. Therefore, the heat of the leakage restricting member 29 is not easily transmitted to the housing 22, and the temperature rise of the injection portion 141 of the addition valve 14 supported by the housing 22 can be suppressed.
（６）しかも、放熱部材２７Ｄは、他の放熱部材２７Ａ〜２７Ｃよりも薄い板材によって形成されている。すなわち、放熱部材２７Ｄの熱容量は、他の放熱部材２７Ａ〜２７Ｃの熱容量よりも小さい。そのため、連結フランジ２１の熱が漏出規制部材２９及び放熱部材２７Ｄに伝わりにくくなる分、連結フランジ２１の熱を、添加弁１４の噴射部１４１から漏出規制部材２９よりも離れて配置される支持ステー２３に伝達させやすくなる。すなわち、熱の伝達経路が添加弁１４の噴射部１４１から極力離れた位置に形成されることで、連結フランジ２１の熱を添加弁１４の噴射部１４１に伝達させにくくすることができる。 (6) Moreover, the heat radiating member 27D is formed of a plate material thinner than the other heat radiating members 27A to 27C. That is, the heat capacity of the heat radiating member 27D is smaller than the heat capacities of the other heat radiating members 27A to 27C. For this reason, the heat of the connection flange 21 is arranged so that the heat of the connection flange 21 is further away from the injection portion 141 of the addition valve 14 than the leakage control member 29 because the heat of the connection flange 21 is less likely to be transmitted to the leakage control member 29 and the heat dissipation member 27D. 23 is easily transmitted. In other words, the heat transmission path is formed at a position as far as possible from the injection portion 141 of the addition valve 14, thereby making it difficult to transfer the heat of the connection flange 21 to the injection portion 141 of the addition valve 14.
（７）本実施形態では、支持ステー２３は、放熱部材２７Ａ〜２７Ｄの放熱用フランジ２７２に形成されているステー挿通孔２７４を挿通する態様で設けられている。そのため、支持ステー２３を放熱用フランジ２７２の周縁よりも添加弁１４から離れた位置に配置しなくてもよい分、添加弁支持装置２０の大型化を抑制することができる。 (7) In the present embodiment, the support stay 23 is provided in such a manner that the stay insertion hole 274 formed in the heat dissipation flange 272 of the heat dissipation members 27A to 27D is inserted. Therefore, the increase in the size of the addition valve support device 20 can be suppressed because the support stay 23 does not have to be disposed at a position farther from the addition valve 14 than the periphery of the heat dissipation flange 272.
（８）また、漏出規制部材２９に当接する放熱部材２７Ｄは、ハウジング２２の軸方向において添加弁１４の噴射部１４１よりも連結フランジ２１から離れて配置されている。そのため、放熱部材２７Ｄが軸方向において噴射部１４１と同一位置に配置される場合と比較して、連結フランジ２１から漏出規制部材２９に伝達された熱が、添加弁１４の噴射部１４１に伝達されにくくなる。したがって、添加弁１４の噴射部１４１の温度上昇を抑制することができる。 (8) In addition, the heat radiating member 27 </ b> D that contacts the leakage restricting member 29 is disposed farther from the connection flange 21 than the injection portion 141 of the addition valve 14 in the axial direction of the housing 22. Therefore, the heat transmitted from the coupling flange 21 to the leakage restricting member 29 is transmitted to the injection unit 141 of the addition valve 14 as compared with the case where the heat dissipation member 27D is disposed at the same position as the injection unit 141 in the axial direction. It becomes difficult. Therefore, the temperature rise of the injection part 141 of the addition valve 14 can be suppressed.
なお、上記実施形態は以下のような別の実施形態に変更してもよい。
・放熱部材２７Ａ〜２７Ｄの放熱用フランジ２７２に形成される挿通部は、支持ステー２３が挿通される構成であれば、孔（ステー挿通孔２７４）以外の構成であってもよい。例えば、挿通部は、放熱用フランジ２７２の周縁部から径方向中心側に向かって切り欠かれた凹部であってもよい。このように構成しても、支持ステー２３を同凹部内に配設することにより、支持ステー２３を放熱用フランジ２７２の周縁よりも内側に配置することができ、添加弁支持装置２０の大型化を抑制することができる。
The above embodiment may be changed to another embodiment as described below.
The insertion portion formed in the heat dissipation flange 272 of the heat dissipation members 27A to 27D may have a configuration other than the hole (stay insertion hole 274) as long as the support stay 23 is inserted. For example, the insertion portion may be a recess cut out from the peripheral edge of the heat dissipation flange 272 toward the center in the radial direction. Even with this configuration, by arranging the support stay 23 in the recess, the support stay 23 can be arranged on the inner side of the periphery of the heat dissipating flange 272, and the addition valve support device 20 can be enlarged. Can be suppressed.
・漏出規制部材２９が密接する放熱部材２７Ｄは、他の放熱部材２７Ａ〜２７Ｃよりも熱容量が小さい構成であれば、他の放熱部材２７Ａ〜２７Ｃを形成する板材と同等の肉厚を有する板材にて形成したものであってもよい。例えば、放熱部材２７Ｄの放熱用フランジ２７２を、他の放熱部材２７Ａ〜２７Ｃの放熱用フランジ２７２よりも小さくしてもよいし、放熱部材２７Ｄを、他の放熱部材２７Ａ〜２７Ｃを形成する素材よりも熱伝導率の低い素材で形成してもよい。このように構成しても、漏出規制部材２９よりも支持ステー２３に連結フランジ２１の熱を伝達させやすくすることができる。 If the heat dissipation member 27D with which the leakage regulating member 29 is in close contact is configured to have a smaller heat capacity than the other heat dissipation members 27A to 27C, the heat dissipation member 27D has a thickness equivalent to the plate that forms the other heat dissipation members 27A to 27C. It may be formed. For example, the heat dissipating flange 272 of the heat dissipating member 27D may be smaller than the heat dissipating flange 272 of the other heat dissipating members 27A to 27C, or the heat dissipating member 27D may be made of a material that forms the other heat dissipating members 27A to 27C. Alternatively, it may be formed of a material having low thermal conductivity. Even if comprised in this way, it can be made easier to transmit the heat | fever of the connection flange 21 to the support stay 23 rather than the leakage control member 29. FIG.
・漏出規制部材２９が密接する放熱部材２７Ｄを、他の放熱部材２７Ａ〜２７Ｃの肉厚と同程度としてもよいし、他の放熱部材２７Ａ〜２７Ｃの肉厚よりも厚くしてもよい。このように構成しても、連結フランジ２１から漏出規制部材２９に伝達された熱を、放熱部材２７Ｄによって外部に放出することができる。 The heat radiating member 27D with which the leakage regulating member 29 is in close contact may be approximately the same as the thickness of the other heat radiating members 27A to 27C, or may be thicker than the thickness of the other heat radiating members 27A to 27C. Even if comprised in this way, the heat | fever transmitted to the leakage control member 29 from the connection flange 21 can be discharge | released outside by the thermal radiation member 27D.
・漏出規制部材２９が密接する放熱部材２７Ｄ以外の他の放熱部材２７Ａ〜２７Ｃは、ハウジング２２の熱を外部に放出できるのであれば、上記実施形態と異なる構成であってもよい。例えば、他の放熱部材２７Ａ〜２７Ｃは、放熱用フランジ２７２の替りに、被支持部２７１から径方向外側に突出する複数の放熱用ピンを備えた構成であってもよい。 The other heat radiating members 27A to 27C other than the heat radiating member 27D with which the leakage regulating member 29 is in close contact may be configured differently from the above embodiment as long as the heat of the housing 22 can be released to the outside. For example, the other heat radiating members 27 </ b> A to 27 </ b> C may include a plurality of heat radiating pins that protrude radially outward from the supported portion 271 instead of the heat radiating flange 272.
・ハウジング２２や漏出規制部材２９の放熱を十分に行うことができるのであれば、ハウジング２２の外周に設ける放熱部材は一つであってもよく、その数は任意に変更可能である。 As long as the housing 22 and the leakage restricting member 29 can sufficiently dissipate heat, the number of the heat dissipating members provided on the outer periphery of the housing 22 may be one, and the number can be arbitrarily changed.
・漏出規制部材２９が密接する放熱部材２７Ｄ以外の他の放熱部材２７Ａ〜２７Ｃのうち少なくとも一つの放熱部材が支持ステー２３に当接していてもよい。この場合、連結フランジ２１から支持ステー２３に伝達された熱の一部は、ハウジング２２を介することなく、支持ステー２３に当接している放熱部材から外部に放出されることとなる。 The at least one heat radiating member other than the heat radiating member 27 </ b> A to 27 </ b> C other than the heat radiating member 27 </ b> D with which the leakage regulating member 29 is in close contact may be in contact with the support stay 23. In this case, part of the heat transmitted from the connecting flange 21 to the support stay 23 is released to the outside from the heat dissipation member in contact with the support stay 23 without passing through the housing 22.
・軸方向において支持ステー２３の被接合部２３１よりも連結フランジ２１から離れた位置にも放熱部材を設けてもよい。
・ハウジング２２の熱を十分に放出することができるのであれば、放熱部材をハウジング２２の外周に設けなくてもよい。また放熱部材に替えて、例えば、ハウジング２２の外周側に水冷式の冷却装置を設け、この冷却装置によってハウジング２２の温度上昇を抑制するようにしてもよい。
A heat radiating member may be provided at a position farther from the coupling flange 21 than the joined portion 231 of the support stay 23 in the axial direction.
If the heat of the housing 22 can be sufficiently released, the heat radiating member may not be provided on the outer periphery of the housing 22. Further, instead of the heat radiating member, for example, a water-cooling type cooling device may be provided on the outer peripheral side of the housing 22 and the temperature increase of the housing 22 may be suppressed by this cooling device.
・突出部材２８は、ハウジング２２に当接しない構成であれば任意の構成であってもよい。例えば、突出部材２８は、連結フランジ２１側の開口部２８２とハウジング２２側の開口部２８１の内径が同一となる円筒であってもよい。 The protruding member 28 may have any configuration as long as it does not contact the housing 22. For example, the protruding member 28 may be a cylinder in which the inner diameters of the opening 282 on the connection flange 21 side and the opening 281 on the housing 22 side are the same.
・漏出規制部材２９を連結フランジ２１に取り付けることができるのであれば、突出部材２８を省略してもよい。
・支持ステー２３は、アッセンブリ部品ＡＳの重心位置よりも連結フランジ２１から離れた位置でハウジング２２を支持する構成であってもよい。この場合、漏出規制部材２９及び放熱部材２７Ｄによってハウジング２２を支持する位置と、支持ステー２３によってハウジング２２を支持する位置との間隔を広げることができ、排気管１２に支持される添加弁１４の支持剛性を高めることができる。また、連結フランジ２１を介して排気管１２に連結される取り付け手段がハウジング２２に固定される固定位置から連結フランジ２１とは反対側に離れた位置に支持ステー２３を固定するほど、取り付け手段の固定位置を支点とする上記アッセンブリ部品ＡＳの振動を効果的に抑制することができる。この点、上記のようにアッセンブリ部品ＡＳの重心位置よりも連結フランジ２１から離れた位置でハウジング２２を支持する構成を採用すれば、アッセンブリ部品ＡＳの重心位置よりも連結フランジ２１から離れた位置で支持ステー２３によってハウジング２２を支持することができる。さらに、重心位置よりも振動の支点から離れた位置でハウジング２２を支持する構成にもなるため、連結フランジ２１側に支点を有するハウジング２２の振動を効果的に抑制することができ、添加弁１４の支持剛性を高めることができる。
As long as the leakage regulating member 29 can be attached to the connecting flange 21, the protruding member 28 may be omitted.
The support stay 23 may be configured to support the housing 22 at a position farther from the coupling flange 21 than the position of the center of gravity of the assembly component AS. In this case, the interval between the position where the housing 22 is supported by the leakage restricting member 29 and the heat radiating member 27D and the position where the housing 22 is supported by the support stay 23 can be widened, and the addition valve 14 supported by the exhaust pipe 12 can be expanded. Support rigidity can be increased. Further, as the attachment means connected to the exhaust pipe 12 via the connection flange 21 is fixed to the position away from the connection position where the attachment means 21 is fixed to the housing 22, the support stay 23 is fixed. It is possible to effectively suppress the vibration of the assembly part AS with the fixed position as a fulcrum. In this regard, if the configuration in which the housing 22 is supported at a position farther from the coupling flange 21 than the center of gravity of the assembly part AS as described above, it is at a position farther from the coupling flange 21 than the center of gravity of the assembly part AS. The housing 22 can be supported by the support stay 23. Further, since the housing 22 is supported at a position farther from the fulcrum of vibration than the position of the center of gravity, vibration of the housing 22 having a fulcrum on the connecting flange 21 side can be effectively suppressed. Support rigidity can be increased.
・排気管１２に支持される添加弁１４の支持剛性を十分に確保できるのであれば、添加弁支持装置２０は、軸方向においてアッセンブリ部品ＡＳの重心位置よりも連結フランジ２１に近い位置でハウジング２２を支持する支持ステーを備える構成であってもよい。 If the support rigidity of the addition valve 14 supported by the exhaust pipe 12 can be sufficiently ensured, the addition valve support device 20 is located in the housing 22 at a position closer to the connecting flange 21 than the center of gravity of the assembly part AS in the axial direction. The structure provided with the support stay which supports may be sufficient.
・排気管１２に支持される添加弁１４の支持剛性を十分に確保できるのであれば、ハウジング２２を支持する支持ステー２３は一つであってもよく、支持ステー２３の数は任意に変更可能である。 As long as the support rigidity of the addition valve 14 supported by the exhaust pipe 12 can be sufficiently secured, the number of the support stays 23 may be arbitrarily changed. It is.
・支持ステーは、ハウジング２２を支持することができるのであれば、板状以外の構成であってもよい。例えば、支持ステーは、棒状や筒状であってもよい。
・添加弁支持装置は、図６に示すように、添加弁１４を収容するハウジング５２２の軸方向における一端に連結フランジ５２１を設け、この連結フランジ５２１が排気管１２に連結される構成であってもよい。この場合には、一端が連結フランジ５２１に固定され、他端がハウジング５２２に固定される支持ステー５２３を設け、この支持ステー５２３でもハウジング５２２を支持させるようにすればよい。このように構成しても、ハウジング５２２は軸方向に離れた複数箇所で支持されることとなり、排気管１２に支持される添加弁１４の支持剛性を高めることができる。また、支持ステー５２３によるハウジング５２２の支持位置よりも連結フランジ５２１の近くに放熱部材５２７を配設することで、ハウジング５２２の熱を放熱部材５２７を介して外部に放出することができる。
The support stay may have a configuration other than a plate shape as long as it can support the housing 22. For example, the support stay may be a rod or a cylinder.
As shown in FIG. 6, the addition valve support device has a configuration in which a connection flange 521 is provided at one end in the axial direction of the housing 522 that accommodates the addition valve 14, and the connection flange 521 is connected to the exhaust pipe 12. Also good. In this case, a support stay 523 having one end fixed to the connection flange 521 and the other end fixed to the housing 522 may be provided, and the support stay 523 may support the housing 522. Even if comprised in this way, the housing 522 will be supported by the several place distant from the axial direction, and the support rigidity of the addition valve 14 supported by the exhaust pipe 12 can be improved. Further, by disposing the heat dissipation member 527 closer to the connection flange 521 than the position where the housing 522 is supported by the support stay 523, the heat of the housing 522 can be released to the outside via the heat dissipation member 527.
・添加弁１４が噴射する還元剤は、排気を還元させることのできるものであれば、尿素水の他、アンモニア水溶液、炭化水素水溶液、ディーゼル燃料やガソリン燃料などの内燃機関の燃料であってもよい。 As long as the reducing agent injected by the addition valve 14 can reduce exhaust gas, it may be a urea aqueous solution, an aqueous ammonia solution, an aqueous hydrocarbon solution, an internal combustion engine fuel such as diesel fuel or gasoline fuel. Good.
１２…排気管、１４…添加弁、１４１…噴射部、２０…添加弁支持装置、２１…連結フランジ、２２，５２２…ハウジング、２３，５２３…支持ステー、２７Ａ，２７Ｂ，２７Ｃ…放熱部材、２７Ｄ…取り付け手段を構成する放熱部材（特定放熱部材）、２７２…放熱用フランジ、２７４…挿通部としてのステー挿通孔、２９…取り付け手段を構成する漏出規制部材、５２１…連結フランジ、５２７…放熱部材、ＡＳ…アッセンブリ部品、ＳＰ…隙間。 DESCRIPTION OF SYMBOLS 12 ... Exhaust pipe, 14 ... Addition valve, 141 ... Injection part, 20 ... Addition valve support apparatus, 21 ... Connection flange, 22,522 ... Housing, 23,523 ... Support stay, 27A, 27B, 27C ... Radiation member, 27D ... Heat dissipating member (specific heat dissipating member) constituting attachment means, 272 ... Flange for heat dissipation, 274 ... Stay insertion hole as insertion part, 29 ... Leakage restricting member constituting attachment means, 521 ... Connection flange, 527 ... Heat dissipation member AS ... Assembly parts, SP ... Gap.
Claims (4)
前記ハウジングを前記排気管に連結させる連結フランジと、
同連結フランジに固定され、前記ハウジングを前記連結フランジに取り付ける取り付け手段と、を備えた添加弁支持装置において、
前記取り付け手段に加え、一端が前記連結フランジに固定され、他端が前記ハウジングに固定される支持ステーを備え、
前記取り付け手段が前記ハウジングに固定される固定位置と、前記支持ステーが前記ハウジングに固定される固定位置とは、同ハウジングの軸方向に離れており、
前記ハウジングを前記連結フランジに触れないように配置し、
前記取り付け手段は、前記連結フランジに固定され、同連結フランジと前記ハウジングとの間に介在する隙間からの排気の漏出を規制する漏出規制部材を有し、
同漏出規制部材の肉厚を前記支持ステーの肉厚よりも薄くし、
前記ハウジングは、前記支持ステーが前記ハウジングに固定される固定位置よりも前記連結フランジの近くに前記添加弁の噴射部が位置する態様で同添加弁を支持し、
前記ハウジングの外周には、前記支持ステーが前記ハウジングに固定される固定位置と前記漏出規制部材との間に複数の放熱部材が設けられ、
前記放熱部材のうち、前記連結フランジの最も近くに位置する特定放熱部材に、前記漏出規制部材が当接しており、
前記特定放熱部材の熱容量は、同特定放熱部材よりも前記連結フランジから離れて配置される他の放熱部材の熱容量よりも小さい
ことを特徴とする添加弁支持装置。 A housing that houses at least a portion of an addition valve that injects a reducing agent into the exhaust pipe;
A connecting flange for connecting the housing to the exhaust pipe;
An addition valve support device comprising: an attachment means fixed to the connection flange and attaching the housing to the connection flange;
In addition to the attachment means, a support stay having one end fixed to the connection flange and the other end fixed to the housing,
The fixed position where the attachment means is fixed to the housing and the fixed position where the support stay is fixed to the housing are separated in the axial direction of the housing ,
The housing is arranged so as not to touch the connecting flange,
The attachment means includes a leakage regulating member that is fixed to the coupling flange and regulates leakage of exhaust gas from a gap interposed between the coupling flange and the housing.
The thickness of the leakage control member is made thinner than the thickness of the support stay,
The housing supports the addition valve in a mode in which the injection portion of the addition valve is positioned closer to the connection flange than a fixed position where the support stay is fixed to the housing,
On the outer periphery of the housing, a plurality of heat radiating members are provided between a fixing position where the support stay is fixed to the housing and the leakage regulating member,
Among the heat radiating members, the leakage restricting member is in contact with a specific heat radiating member located closest to the connecting flange,
The heat capacity of the specific heat radiating member is smaller than the heat capacity of other heat radiating members arranged away from the connecting flange than the specific heat radiating member .
請求項１に記載の添加弁支持装置。 The addition valve support device according to claim 1, wherein the support stay is fixed to the housing at a center of gravity of an assembly part including the housing and the addition valve.
前記支持ステーは、前記アッセンブリ部品の重心位置よりも前記連結フランジから離れた位置で前記ハウジングに固定される
請求項１に記載の添加弁支持装置。 The attachment means is fixed to the housing at a position closer to the connection flange than a center of gravity position of an assembly part including the housing and the addition valve,
The addition valve support device according to claim 1, wherein the support stay is fixed to the housing at a position farther from the connection flange than a position of the center of gravity of the assembly component.
請求項１〜請求項３のうち何れか一項に記載の添加弁支持装置。 The heat dissipating member has a heat dissipating flange extending in a radial direction, and an insertion portion through which the support stay is inserted is formed in the heat dissipating flange.
The addition valve support device according to any one of claims 1 to 3 .
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3182789B2 (en) | 1991-06-26 | 2001-07-03 | セイコーエプソン株式会社 | Printer control device, printer and control method therefor |
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| JP6345628B2 (en) * | 2015-05-26 | 2018-06-20 | コベルコ建機株式会社 | Gasket for reducing agent injector and exhaust gas aftertreatment device having the same |
| JP6954042B2 (en) * | 2017-11-21 | 2021-10-27 | 株式会社デンソー | Add-on valve mounting structure |
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| JPS61108848A (en) * | 1984-10-31 | 1986-05-27 | Yamaha Motor Co Ltd | Cooling fin anti-vibrating device for air cooling engine |
| JP2948854B2 (en) * | 1990-03-08 | 1999-09-13 | ヤマハ発動機株式会社 | Engine cooling system |
| JP2005264756A (en) * | 2004-03-16 | 2005-09-29 | Toyota Industries Corp | Exhaust emission control device |
| DE102005061145A1 (en) * | 2005-12-21 | 2007-06-28 | Robert Bosch Gmbh | Automotive exhaust pipe is shaped to maximize or minimize release of heat to adjacent reduction agent dosing valve upstream from catalytic converter |
| JP2007321647A (en) * | 2006-05-31 | 2007-12-13 | Hitachi Ltd | Exhaust treatment equipment for engines |
| JP2008138633A (en) * | 2006-12-04 | 2008-06-19 | Mitsubishi Motors Corp | Injector mounting structure |
| DE102006061730A1 (en) * | 2006-12-28 | 2008-07-03 | Robert Bosch Gmbh | Selective catalytic reduction injection device for use in internal combustion engine, has sleeve including elongated thin-walled connecting section connected indirectly and positively to axial end by flange |
| DE102006061733A1 (en) * | 2006-12-28 | 2008-07-03 | Robert Bosch Gmbh | Retaining device for retaining of reducing agent-dosing valve, has internal space for retaining reducing agent-dosing valve, and sound damping device, which absorbs sound waves that come out from internal space |
| JP2008240552A (en) * | 2007-03-26 | 2008-10-09 | Mitsubishi Motors Corp | Exhaust gas purification device for internal combustion engine |
| JP4985976B2 (en) * | 2007-12-25 | 2012-07-25 | 三菱自動車工業株式会社 | Exhaust gas purification device for internal combustion engine |
| JP5500909B2 (en) * | 2009-08-25 | 2014-05-21 | ボッシュ株式会社 | Exhaust purification device |
| DE102009048514A1 (en) * | 2009-10-07 | 2011-04-14 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Injektorhalterung |
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| JP3182789B2 (en) | 1991-06-26 | 2001-07-03 | セイコーエプソン株式会社 | Printer control device, printer and control method therefor |
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