JP4867923B2 - Injection valve mounting structure - Google Patents

Injection valve mounting structure Download PDF

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JP4867923B2
JP4867923B2 JP2008016054A JP2008016054A JP4867923B2 JP 4867923 B2 JP4867923 B2 JP 4867923B2 JP 2008016054 A JP2008016054 A JP 2008016054A JP 2008016054 A JP2008016054 A JP 2008016054A JP 4867923 B2 JP4867923 B2 JP 4867923B2
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exhaust
passage
hole
injection valve
plate member
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JP2009174485A (en
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宏明 永友
一洋 小鹿
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Denso Corp
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Denso Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Description

本発明は、内燃機関の排気通路へ尿素水等の添加剤を噴射する噴射弁の搭載構造に関する。   The present invention relates to a mounting structure for an injection valve that injects an additive such as urea water into an exhaust passage of an internal combustion engine.

近年、発電所、各種工場、及び車両（特にディーゼルエンジン搭載の車両）等の内燃機関に適用されて、内燃機関の排気中のＮＯｘ（窒素酸化物）を高い浄化率で浄化する排気浄化装置として、特許文献１等に記載の尿素ＳＣＲ（選択還元）システムの開発が進められており、一部実用化に至っている。この排気浄化装置は、尿素水等のＮＯｘ還元剤（添加剤）を排気通路へ噴射する噴射弁を備えている。この種の噴射弁は、尿素水を噴射する噴孔が形成されたボディ、及びボディ内部に収容されて噴孔に通じる尿素水通路を開閉する弁体を有して構成され、噴孔が内燃機関の排気通路に位置するよう搭載されることが一般的である。
特開２００３−２９３７３９号公報 In recent years, it has been applied to internal combustion engines such as power plants, various factories, and vehicles (particularly vehicles equipped with diesel engines), and as an exhaust purification device that purifies NOx (nitrogen oxides) in the exhaust of internal combustion engines with a high purification rate. The development of a urea SCR (selective reduction) system described in Patent Document 1 and the like has been promoted, and a part has been put into practical use. This exhaust purification device includes an injection valve that injects a NOx reducing agent (additive) such as urea water into an exhaust passage. This type of injection valve is configured to have a body in which a nozzle hole for injecting urea water is formed, and a valve body that opens and closes a urea water passage that is accommodated in the body and communicates with the nozzle hole. It is generally mounted so as to be located in the exhaust passage of the engine.
JP 2003-293739 A

ここで、内燃機関の排気は高温であり、噴射弁のボディの先端部は高温の排気にさらされる。そして、高温（例えば約５００℃）になったボディ先端部は焼き鈍りによる硬度低下を招くおそれがある。また、ボディ先端部が高温（例えば１６０℃以上）になると、排気中に含まれる異物（例えば、ＰＭ（粒子状物質）、未燃燃料、潤滑油、添加剤、又はこれらが化学反応して生成された物質）がデポジットとしてボディに付着しやすくなることが一般的に知られており、デポジットが噴孔を詰まらせる等の不具合を誘発するおそれが生じる。   Here, the exhaust of the internal combustion engine is hot, and the tip of the body of the injection valve is exposed to the hot exhaust. And the body front-end | tip part which became high temperature (for example, about 500 degreeC) may cause the hardness fall by annealing. In addition, when the body tip reaches a high temperature (for example, 160 ° C. or higher), foreign substances (for example, PM (particulate matter), unburned fuel, lubricating oil, additives, or these contained in the exhaust gas are generated by a chemical reaction. It is generally known that the deposited substance is likely to adhere to the body as a deposit, and the deposit may cause problems such as clogging the nozzle hole.

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、その目的は、排気通路へ添加剤を噴射する噴射弁のボディ先端部に対し、高温化抑制を図った噴射弁の搭載構造を提供することにある。   The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a mounting structure for an injection valve that suppresses the increase in temperature at the body tip of the injection valve that injects the additive into the exhaust passage. It is to provide.

以下、上記課題を解決するための手段、及びその作用効果について記載する。   Hereinafter, means for solving the above-described problems and the operation and effects thereof will be described.

第１の発明では、
添加剤を噴射する噴孔が形成されたボディ、及び前記ボディ内部に収容されて前記噴孔に通じる添加剤通路を開閉する弁体を有し、前記噴孔が内燃機関の排気通路に位置するよう搭載されるとともに、前記噴孔から前記排気通路へ前記添加剤を噴射する噴射弁と、
前記ボディのうち前記噴孔を形成する部位であるボディ先端部に対向するよう配置されるとともに、前記噴孔から噴射された添加剤を通過させる通過穴が形成されたプレート部材と、
を備え、
前記プレート部材には、前記排気通路を流れる排気のうち前記ボディ先端部に向かって流れてくる排気流を前記ボディ先端部から逸らすよう偏向させる偏向面が形成されていることを特徴とする。 In the first invention,
A body formed with an injection hole for injecting the additive, and a valve body that is accommodated in the body and opens and closes an additive passage that communicates with the injection hole, and the injection hole is located in an exhaust passage of the internal combustion engine; An injection valve that injects the additive from the nozzle hole into the exhaust passage;
A plate member that is disposed so as to face a body tip portion that is a portion that forms the nozzle hole in the body, and that has a passage hole through which an additive injected from the nozzle hole is passed;
With
The plate member is formed with a deflection surface for deflecting the exhaust flow flowing toward the body tip portion of the exhaust gas flowing through the exhaust passage so as to be deflected from the body tip portion.

これによれば、ボディ先端部に向かって流れてくる排気流（図１中の矢印Ｙ２参照）は、プレート部材に衝突した後、当該プレート部材の偏向面によりボディ先端部から逸れるよう偏向される（図１中の矢印Ｙ３参照）。よって、排気流がボディ先端部に直接衝突することを回避できるので、ボディ先端部が排気流によって高温になることを抑制できる。   According to this, the exhaust flow (see arrow Y2 in FIG. 1) flowing toward the front end of the body collides with the plate member, and is then deflected so as to deviate from the front end of the body by the deflection surface of the plate member. (See arrow Y3 in FIG. 1). Therefore, it is possible to avoid the exhaust flow from directly colliding with the front end portion of the body, so that it is possible to suppress the body front end portion from becoming high temperature due to the exhaust flow.

このように偏向させる機能を有する偏向面の具体的形状として、第２の発明の如く、前記通過穴へ近づくにつれ前記噴射弁へ近づく向きに凹む凹形状（図６参照）や、第３の発明の如く、前記通過穴へ近づくにつれ前記噴射弁から遠ざかる向きに突出する凸形状（図７参照）が挙げられる。 As a specific shape of the deflecting surface having a function of deflecting in this way, as in the second invention, a concave shape (see FIG. 6) that is recessed toward the injection valve as it approaches the passage hole, or a third invention. As described above, there is a convex shape (see FIG. 7) that protrudes away from the injection valve as it approaches the passage hole.

第４の発明では、前記排気通路を内部に形成する排気管には、当該排気管の内壁から排気管径方向の外側に凹む収容室が形成され、前記収容室には前記ボディ先端部が収容され、前記偏向面は、前記排気通路内を流れる排気の主流から分流して前記収容室内に流入した副流を、前記ボディ先端部から逸らすよう偏向させることを特徴とする。 According to a fourth aspect of the present invention, the exhaust pipe that forms the exhaust passage has an accommodation chamber that is recessed outward from the inner wall of the exhaust pipe in the radial direction of the exhaust pipe, and the front end of the body is accommodated in the accommodation chamber. The deflecting surface deflects the side flow that is diverted from the main flow of the exhaust gas flowing in the exhaust passage and flows into the accommodation chamber so as to be deflected from the front end portion of the body.

このように、排気管の内壁から排気管径方向の外側に凹む収容室にボディ先端部を収容すれば、排気の主流が直接ボディ先端部に向かって流れてくることを回避できるので、ボディ先端部の高温化抑制を促進できる。なお、排気の主流から分流した副流は収容室内に流入してくるものの、当該副流は主流よりも熱エネルギが小さいため、ボディ先端部の高温化抑制を促進できる。さらに、このような副流についても、プレート部材の偏向面によりボディ先端部から逸れるよう偏向されるので、ボディ先端部の高温化を好適に抑制できる。   In this way, if the body tip is housed in the housing chamber that is recessed outward from the inner wall of the exhaust pipe in the radial direction of the exhaust pipe, it is possible to avoid the main flow of exhaust from flowing directly toward the body tip. It is possible to promote the suppression of the high temperature of the part. In addition, although the substream branched from the main flow of the exhaust flows into the housing chamber, since the subflow has a smaller heat energy than the main flow, it is possible to promote the suppression of the temperature at the front end of the body. Further, such a side flow is also deflected by the deflection surface of the plate member so as to deviate from the front end of the body, so that the high temperature of the front end of the body can be suitably suppressed.

ここで、プレート部材もボディ先端部と同様に高温の排気にさらされて加熱された状態となる。すると、プレート部材の熱がボディ先端部に伝熱してしまい、ボディ先端部を加熱することが懸念される。この懸念に対し、第５の発明では、前記プレート部材は、前記ボディとの間に隙間を有するよう、或いは前記ボディと線接触するよう配置されていることを特徴とするので、プレート部材からボディ先端部への伝熱量を低減できる。 Here, the plate member is also exposed to high-temperature exhaust and heated in the same manner as the front end of the body. Then, there is a concern that the heat of the plate member is transferred to the front end of the body and the front end of the body is heated. In response to this concern, in the fifth aspect of the invention, the plate member is disposed so as to have a gap with the body or in line contact with the body. The amount of heat transfer to the tip can be reduced.

第６の発明では、前記噴射弁の近傍には前記ボディを冷却する冷却手段が備えられており、前記プレート部材は、前記冷却手段との間に隙間を有するよう、或いは前記冷却手段と線接触するよう配置されていることを特徴とする。そのため、上述の如く排気にさらされて高温となったプレート部材から冷却手段への伝熱量を低減できる。 In a sixth aspect of the invention, cooling means for cooling the body is provided in the vicinity of the injection valve, and the plate member has a gap between the cooling means or is in line contact with the cooling means. It is arrange | positioned so that it may carry out. Therefore, the heat transfer amount from the plate member exposed to the exhaust as described above to a high temperature can be reduced.

ここで、通過穴は小さく設定するほど、通過穴からボディ先端部に流入する排気量を少なくできるものの、その背反として、噴射された添加剤が通過穴を通過できずにプレート部材と干渉するおそれが大きくなる。また、ボディ先端部を通過穴に近づけるほど前記干渉のおそれを小さくできるものの、その背反として、ボディ先端部が排気に近づくこととなるため高温化しやすくなる。   Here, the smaller the passage hole is set, the smaller the amount of exhaust gas flowing from the passage hole to the tip of the body, but as a contradiction, the injected additive may not pass through the passage hole and may interfere with the plate member. Becomes larger. Further, the closer the body tip is to the passage hole, the smaller the possibility of the interference, but as a contradiction, the body tip tends to approach exhaust and the temperature tends to increase.

これらの点を鑑み本発明者らが各種試験を行ったところ、第７の発明の如く、前記通過穴を、直径が４ｍｍ以下に形成された円形にすることが、上述の干渉及び高温化抑制を図る上で望ましいことが分かった。 In view of these points, the present inventors conducted various tests. As in the seventh invention , the above-described interference and high temperature suppression can be achieved by making the passage hole into a circular shape having a diameter of 4 mm or less. It was found that it is desirable to plan.

以下、本発明を具体化した各実施形態を図面に基づいて説明する。なお、以下の各実施形態相互において、互いに同一もしくは均等である部分には、図中、同一符号を付してある。   Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

（第１実施形態）
本実施形態に係る噴射弁は、図１に示す排気浄化装置を構成するものであり、この排気浄化装置は、車載ディーゼルエンジン（内燃機関）の燃焼室から排出されて排気管１０の排気通路１０ａを流れる排気を浄化する。 (First embodiment)
The injection valve according to the present embodiment constitutes the exhaust purification device shown in FIG. 1, and this exhaust purification device is exhausted from the combustion chamber of an in-vehicle diesel engine (internal combustion engine) and exhaust passage 10 a of exhaust pipe 10. Purifies the exhaust flowing through.

排気浄化装置は、排気浄化反応を促進する触媒装置（図示せず）と、触媒装置の排気上流側に配置され、排気通路１０ａ中の排気に対して尿素水溶液（添加剤）を噴射供給する噴射弁２０とを有して構成されている。触媒装置は、ＮＯｘの還元反応（排気浄化反応）を促進するものである。   The exhaust purification device is a catalyst device (not shown) that promotes an exhaust purification reaction, and an injection that is disposed on the exhaust upstream side of the catalyst device, and injects and supplies an aqueous urea solution (additive) to the exhaust gas in the exhaust passage 10a. And a valve 20. The catalyst device promotes a NOx reduction reaction (exhaust purification reaction).

このような構成による排気浄化装置では、噴射弁２０により排気中へ尿素水溶液を噴射供給し、排気の流れ（排気流）を利用してその排気共々尿素水溶液を下流の触媒へ供給するとともに、該触媒上でＮＯｘの還元反応を行うことによってその排気を浄化する。ＮＯｘの還元に際しては、尿素水溶液が排気熱で加水分解されることによりアンモニア（ＮＨ3）が生成され、触媒にて選択的に吸着された排気中のＮＯｘに対し、このアンモニアが添加される。そして、同触媒上で、そのアンモニアに基づく還元反応が行われることによって、ＮＯｘが還元、浄化されることになる。   In the exhaust gas purification apparatus having such a configuration, the urea aqueous solution is injected and supplied into the exhaust gas by the injection valve 20, and the urea aqueous solution is supplied to the downstream catalyst using the exhaust flow (exhaust flow). The exhaust gas is purified by performing a NOx reduction reaction on the catalyst. In the reduction of NOx, ammonia (NH3) is generated by hydrolyzing the urea aqueous solution with exhaust heat, and this ammonia is added to NOx in the exhaust gas selectively adsorbed by the catalyst. Then, NOx is reduced and purified by performing a reduction reaction based on the ammonia on the catalyst.

尿素水タンク１１に貯蔵された尿素水溶液（以下、単に尿素水と呼ぶ）は、尿素水ポンプ１２により汲み上げられて吐出され、フィルタ１３を介して噴射弁２０に供給される。なお、尿素水ポンプ１２から吐出された余剰尿素水は、レギュレータ１４により尿素水タンク１１に戻される。また、尿素水ポンプ１２及び噴射弁２０の作動はエンジンＥＣＵ１５により制御される。   A urea aqueous solution (hereinafter simply referred to as urea water) stored in the urea water tank 11 is pumped up and discharged by the urea water pump 12 and supplied to the injection valve 20 through the filter 13. The surplus urea water discharged from the urea water pump 12 is returned to the urea water tank 11 by the regulator 14. The operations of the urea water pump 12 and the injection valve 20 are controlled by the engine ECU 15.

次に、図２及び図３を参照して噴射弁２０の構成について説明する。図２は噴射弁２０の断面図であり、図３は図２の拡大図である。噴射弁２０のハウジング２１は円筒状に形成されている。ハウジング２１は、第一磁性部２１ａ、非磁性部２１ｂ及び第二磁性部２１ｃを有している。非磁性部２１ｂは、第一磁性部２１ａと第二磁性部２１ｃとの磁気的な短絡を防止する。第一磁性部２１ａ、非磁性部２１ｂ及び第二磁性部２１ｃは、例えばレーザ溶接などにより一体に接続されている。   Next, the structure of the injection valve 20 is demonstrated with reference to FIG.2 and FIG.3. 2 is a cross-sectional view of the injection valve 20, and FIG. 3 is an enlarged view of FIG. The housing 21 of the injection valve 20 is formed in a cylindrical shape. The housing 21 includes a first magnetic part 21a, a nonmagnetic part 21b, and a second magnetic part 21c. The nonmagnetic portion 21b prevents a magnetic short circuit between the first magnetic portion 21a and the second magnetic portion 21c. The first magnetic part 21a, the nonmagnetic part 21b, and the second magnetic part 21c are integrally connected by, for example, laser welding.

ハウジング２１の軸方向の一方の端部には入口部材２２が取り付けられている。入口部材２２に形成された尿素水入口２２ａには、尿素水ポンプ１２から吐出された尿素水が供給される。尿素水入口２２ａに供給された尿素水は、異物を除去するフィルタ２３を経由してハウジング２１の内周側に流入する。   An inlet member 22 is attached to one end of the housing 21 in the axial direction. The urea water discharged from the urea water pump 12 is supplied to the urea water inlet 22 a formed in the inlet member 22. The urea water supplied to the urea water inlet 22a flows into the inner peripheral side of the housing 21 through the filter 23 that removes foreign matters.

ハウジング２１の他方の端部には、ノズルホルダ２４が設置されている。ノズルホルダ２４は、円筒状に形成され、内側にノズルボディ２５を収容する。ノズルボディ２５は、円筒状に形成され、例えば圧入あるいは溶接などにより、ノズルホルダ２４に固定されている。なお、ノズルホルダ２４及びノズルボディ２５は、特許請求の範囲に記載の「ボディ」に相当するものであり、当該ボディは、別体に形成されたノズルホルダ２４及びノズルボディ２５を溶接等により接続して構成してもよいし、同一の母材から削り出し、又は鋳造等により一体に構成してもよい。   A nozzle holder 24 is installed at the other end of the housing 21. The nozzle holder 24 is formed in a cylindrical shape and accommodates the nozzle body 25 inside. The nozzle body 25 is formed in a cylindrical shape, and is fixed to the nozzle holder 24 by, for example, press fitting or welding. The nozzle holder 24 and the nozzle body 25 correspond to the “body” recited in the claims, and the body connects the nozzle holder 24 and the nozzle body 25 formed separately by welding or the like. You may comprise, and you may cut out from the same base material, or you may comprise integrally by casting etc.

ノズルボディ２５は、図３に示すように先端に近づくにつれて内径が小さくなる円錐状の内壁面に弁座部２５ａを有している。また、ノズルボディ２５の端面には、尿素水入口２２ａに供給された尿素水を噴射する複数の噴孔２５ｂが形成されている。なお、尿素水入口２２ａに供給された尿素水は、入口部材２２内部、ハウジング２１内部、ノズルホルダ２４内部、ノズルボディ２５内部を順に流通した後、噴孔２５ｂから排気通路１０ａに噴射される。   As shown in FIG. 3, the nozzle body 25 has a valve seat portion 25a on a conical inner wall surface whose inner diameter becomes smaller as it approaches the tip. A plurality of injection holes 25b for injecting urea water supplied to the urea water inlet 22a are formed on the end surface of the nozzle body 25. The urea water supplied to the urea water inlet 22a flows through the inlet member 22, the housing 21, the nozzle holder 24, and the nozzle body 25 in this order, and is then injected from the nozzle hole 25b into the exhaust passage 10a.

ノズルボディ２５のうち噴孔２５ｂが形成される先端部分は、噴射弁２０の中心線Ｊ１に対して垂直に拡がる板状に形成されており、噴孔２５ｂが貫通する向きは、噴孔２５ｂの出口部が噴孔２５ｂの入口部よりも中心線Ｊ１の外側に位置するように傾斜している。つまり、噴孔２５ｂの中心線Ｊ２（図４参照）は中心線Ｊ１と交差するよう傾斜する。   The tip portion of the nozzle body 25 where the injection hole 25b is formed is formed in a plate shape that extends perpendicularly to the center line J1 of the injection valve 20, and the direction through which the injection hole 25b passes is the same as that of the injection hole 25b. The outlet portion is inclined so as to be located outside the center line J1 with respect to the inlet portion of the nozzle hole 25b. That is, the center line J2 (see FIG. 4) of the nozzle hole 25b is inclined so as to intersect the center line J1.

ハウジング２１、ノズルホルダ２４及びノズルボディ２５により、内部に収容室を形成するバルブボディを構成している。その収容室には、ニードル２６（弁体）が軸方向へ往復移動可能に収容されている。ニードル２６は、ノズルボディ２５と概ね同軸上に配置されており、ノズルボディ２５との間に尿素水が流れる尿素水通路２７（添加剤通路）を形成する。また、ニードル２６の端部には、ノズルボディ２５の弁座部２５ａと当接可能なシール部２６ａが形成されている。   The housing 21, the nozzle holder 24, and the nozzle body 25 constitute a valve body that forms a storage chamber therein. A needle 26 (valve element) is accommodated in the accommodation chamber so as to be reciprocally movable in the axial direction. The needle 26 is disposed substantially coaxially with the nozzle body 25, and forms a urea water passage 27 (additive passage) through which urea water flows between the needle body 25 and the needle 26. Further, a seal portion 26 a that can contact the valve seat portion 25 a of the nozzle body 25 is formed at the end portion of the needle 26.

噴射弁２０は、図２に示すようにニードル２６を駆動する駆動部４０を有している。駆動部４０は、スプール４１、コイル４２、固定コア４３、プレートハウジング４４及び可動コア４７を有している。スプール４１は、ハウジング２１の外周側に設置されるとともに、樹脂で筒状に形成され、外周側にコイル４２が巻かれている。コイル４２は、コネクタ４５の端子部４６に接続している。ハウジング２１を挟んでコイル４２の内周側には固定コア４３が設置されている。固定コア４３は、例えば鉄などの磁性材料により筒状に形成され、ハウジング２１の内周側に圧入などにより固定されている。プレートハウジング４４は、磁性材料から形成され、コイル４２の外周側を覆っている。   The injection valve 20 has a drive unit 40 that drives the needle 26 as shown in FIG. The drive unit 40 includes a spool 41, a coil 42, a fixed core 43, a plate housing 44, and a movable core 47. The spool 41 is installed on the outer peripheral side of the housing 21 and is formed into a cylindrical shape with resin, and a coil 42 is wound around the outer peripheral side. The coil 42 is connected to the terminal portion 46 of the connector 45. A fixed core 43 is installed on the inner peripheral side of the coil 42 across the housing 21. The fixed core 43 is formed in a cylindrical shape from a magnetic material such as iron, and is fixed to the inner peripheral side of the housing 21 by press-fitting or the like. The plate housing 44 is made of a magnetic material and covers the outer peripheral side of the coil 42.

可動コア４７は、ハウジング２１内にて軸方向へ往復移動可能に設置されており、例えば鉄などの磁性材料により形成されている。そして、可動コア４７にはニードル２６の端部が圧入又は溶接等により接続されており、ニードル２６と可動コア４７とは一体的に軸方向へ往復移動する。また、可動コア４７は、スプリング４８の弾性力により、弁座部２５ａに向けて押し付けられている。したがって、可動コア４７と接続されているニードル２６は、シール部２６ａを弁座部２５ａに着座させる向きに押し付けられる。   The movable core 47 is installed in the housing 21 so as to be capable of reciprocating in the axial direction, and is made of a magnetic material such as iron. The end of the needle 26 is connected to the movable core 47 by press-fitting or welding, and the needle 26 and the movable core 47 are integrally reciprocated in the axial direction. The movable core 47 is pressed toward the valve seat portion 25 a by the elastic force of the spring 48. Therefore, the needle 26 connected to the movable core 47 is pressed in the direction in which the seal portion 26a is seated on the valve seat portion 25a.

コイル４２に通電していないとき、可動コア４７及びニードル２６は弁座部２５ａ側へ押し付けられ、シール部２６ａは弁座部２５ａに着座する。これにより、尿素水通路２７が遮断されて、噴孔２５ｂからの尿素水噴射が停止される。一方、コイル４２に通電したときには、可動コア４７が固定コア４３に吸引されてニードル２６が弁座部２５ａから離座し、尿素水通路２７が開放されて噴孔２５ｂから尿素水が噴射される。   When the coil 42 is not energized, the movable core 47 and the needle 26 are pressed toward the valve seat portion 25a, and the seal portion 26a is seated on the valve seat portion 25a. As a result, the urea water passage 27 is blocked, and the urea water injection from the nozzle hole 25b is stopped. On the other hand, when the coil 42 is energized, the movable core 47 is attracted by the fixed core 43, the needle 26 is separated from the valve seat portion 25a, the urea water passage 27 is opened, and urea water is injected from the nozzle hole 25b. .

次に、先述のバルブボディのうちノズルホルダ２４及びノズルボディ２５に関し、これらノズルホルダ２４及びノズルボディ２５の材質には、耐熱性及び強度が求められることに加え、尿素水に対する耐腐食性を有する材質が望ましい。そこで本実施形態では、ノズルホルダ２４及びノズルボディ２５をステンレス製としている。特にノズルボディ２５については、その弁座部２５ａにニードル２６が繰り返し当接することとなるため、耐磨耗性に優れた高硬度の材質が望まれる。この点においてもノズルボディ２５の材質をステンレス製とすることが望ましい。   Next, regarding the nozzle holder 24 and the nozzle body 25 among the valve bodies described above, the materials of the nozzle holder 24 and the nozzle body 25 are required to have heat resistance and strength, and have corrosion resistance against urea water. Material is desirable. Therefore, in this embodiment, the nozzle holder 24 and the nozzle body 25 are made of stainless steel. In particular, for the nozzle body 25, since the needle 26 repeatedly comes into contact with the valve seat portion 25a, a high-hardness material excellent in wear resistance is desired. Also in this respect, it is desirable that the material of the nozzle body 25 is made of stainless steel.

また、これらノズルホルダ２４及びノズルボディ２５は、高温の排気により加熱され、焼き鈍りによる硬度低下を招くことが懸念される。また、ノズルボディ２５が高温（例えば１６０℃以上）になると、排気中に含まれる異物（例えば、ＰＭ（粒子状物質）、未燃燃料、潤滑油、又はこれらが化学反応して生成された物質）や、噴射された尿素水がデポジットとして付着しやすくなることが一般的に知られており、デポジットが噴孔２５ｂを詰まらせることが懸念される。   In addition, there is a concern that the nozzle holder 24 and the nozzle body 25 are heated by high-temperature exhaust and cause a decrease in hardness due to annealing. Further, when the nozzle body 25 reaches a high temperature (for example, 160 ° C. or higher), foreign matter (for example, PM (particulate matter), unburned fuel, lubricating oil, or a substance generated by a chemical reaction between them is included in the exhaust gas. ), And it is generally known that the injected urea water tends to adhere as a deposit, and there is a concern that the deposit clogs the nozzle hole 25b.

これらの懸念を解消すべく、ノズルホルダ２４の外周側には、図１の拡大図である図４に示すように熱伝導部材５０を介して冷却手段６０が備えられている。冷却手段６０は、ジャケット６１内部の冷却通路６２に冷却液を循環させるよう構成されており、この冷却液には、燃焼室を内部に形成するシリンダブロック等のエンジン冷却液を用いている。なお、熱伝導部材５０の形状及び作用効果については後に詳述する。   In order to eliminate these concerns, a cooling means 60 is provided on the outer peripheral side of the nozzle holder 24 via a heat conducting member 50 as shown in FIG. 4 which is an enlarged view of FIG. The cooling means 60 is configured to circulate coolant through a cooling passage 62 inside the jacket 61, and engine coolant such as a cylinder block that forms a combustion chamber therein is used as this coolant. The shape and operational effects of the heat conducting member 50 will be described in detail later.

ノズルホルダ２４及びノズルボディ２５には尿素水に対する耐腐食性が要求されるのに対し、熱伝導部材５０は、尿素水に触れることがないため耐腐食性が要求されない。よって、熱伝導部材５０の材質にはノズルホルダ２４及びノズルボディ２５よりも熱伝導率の高い材質が望ましく、本実施形態では熱伝導部材５０の材質を銅製としている。また、ジャケット６１の材質には、冷却液に対する耐腐食性及び耐熱性が要求されるためステンレス製を採用している。   The nozzle holder 24 and the nozzle body 25 are required to have corrosion resistance against urea water, whereas the heat conduction member 50 is not required to have corrosion resistance because it does not touch the urea water. Therefore, the material of the heat conducting member 50 is desirably a material having a higher thermal conductivity than the nozzle holder 24 and the nozzle body 25. In this embodiment, the material of the heat conducting member 50 is made of copper. The jacket 61 is made of stainless steel because corrosion resistance and heat resistance to the coolant are required.

また、熱伝導部材５０の本体部５１の肉厚寸法は、ジャケット６１の肉厚よりも大きく設定することが望ましい。さらに、本体部５１の肉厚寸法は、ノズルホルダ２４の肉厚よりも大きく設定することが望ましい。   Moreover, it is desirable to set the wall thickness of the main body 51 of the heat conducting member 50 to be larger than the wall thickness of the jacket 61. Furthermore, it is desirable to set the wall thickness of the main body 51 larger than the wall thickness of the nozzle holder 24.

次に、噴射弁２０の取り付け構造について説明する。ジャケット６１は、シリンダヘッド、シリンダブロック或いはこれらに備えられた取付部材１６の貫通穴１６ａに、溶接等により取り付けられている。ジャケット６１は略円筒形状であり、ジャケット６１の円筒内部には排気通路１０ａの反対側から熱伝導部材５０が挿入配置されている。また、熱伝導部材５０は略円筒形状であり、熱伝導部材５０の円筒内部には排気通路１０ａの反対側からノズルホルダ２４が挿入配置されている。   Next, the mounting structure of the injection valve 20 will be described. The jacket 61 is attached by welding or the like to the cylinder head, the cylinder block, or the through hole 16a of the attachment member 16 provided in these. The jacket 61 has a substantially cylindrical shape, and the heat conduction member 50 is inserted into the cylinder of the jacket 61 from the opposite side of the exhaust passage 10a. Further, the heat conducting member 50 has a substantially cylindrical shape, and the nozzle holder 24 is inserted into the cylinder of the heat conducting member 50 from the opposite side of the exhaust passage 10a.

熱伝導部材５０は、噴射弁２０が挿入配置された状態でジャケット６１に挿入して組み付けるようにしてもよいし、噴射弁２０が挿入配置されていない状態でジャケット６１に組み付けてもよい。但し、ジャケット６１に対する噴射弁２０の脱着とは別に、熱伝導部材５０はジャケット６１に対して脱着可能に構成することが望ましい。   The heat conducting member 50 may be inserted and assembled to the jacket 61 in a state where the injection valve 20 is inserted and arranged, or may be assembled to the jacket 61 in a state where the injection valve 20 is not inserted and arranged. However, it is desirable that the heat conducting member 50 be configured to be detachable from the jacket 61 separately from the detachment of the injection valve 20 from the jacket 61.

図４に示すように熱伝導部材５０は、円筒状の本体部５１、及びその本体部５１から径方向外側に突出する突出部５２を有して構成されており、ノズルホルダ２４及びノズルボディ２５と概ね同軸上に配置されている。本体部５１及び突出部５２の内周面５０ａは、その全体がノズルホルダ２４の外周面と接触している。この接触面を通じて、ノズルホルダ２４の熱が熱伝導部材５０に移動することとなる。また、本体部５１及び突出部５２の外周面５０ｂは、その全体がジャケット６１の内周面と接触している。この接触面を通じて、熱伝導部材５０の熱がジャケット６１に移動し、冷却液と熱交換することで冷却されることとなる。   As shown in FIG. 4, the heat conducting member 50 includes a cylindrical main body 51 and a protrusion 52 that protrudes radially outward from the main body 51, and the nozzle holder 24 and the nozzle body 25. And are arranged on the same axis. The entire inner peripheral surface 50 a of the main body 51 and the protruding portion 52 is in contact with the outer peripheral surface of the nozzle holder 24. Through this contact surface, the heat of the nozzle holder 24 moves to the heat conducting member 50. Further, the entire outer peripheral surface 50 b of the main body 51 and the protruding portion 52 is in contact with the inner peripheral surface of the jacket 61. Through this contact surface, the heat of the heat conducting member 50 moves to the jacket 61 and is cooled by exchanging heat with the coolant.

噴射弁２０は、クランプＫ（図２中の二点鎖線参照）により取付部材１６に固定されている。より具体的に説明すると、ノズルホルダ２４には径方向に突出するフランジ部２４Ｆが形成されている。そして、図４に示すように、フランジ部２４Ｆのうち熱伝導部材５０と反対側の面は、クランプＫの一端に押し付けられる係止面２４ａとして機能し、フランジ部２４Ｆのうち熱伝導部材５０の側の面は、熱伝導部材５０の端面５２ａに当接する当接面２４ｂとして機能する。   The injection valve 20 is fixed to the mounting member 16 by a clamp K (see a two-dot chain line in FIG. 2). More specifically, the nozzle holder 24 is formed with a flange portion 24F protruding in the radial direction. And as shown in FIG. 4, the surface on the opposite side to the heat conductive member 50 of the flange part 24F functions as the latching surface 24a pressed against the end of the clamp K, and the heat conductive member 50 of the flange part 24F. The surface on the side functions as a contact surface 24 b that contacts the end surface 52 a of the heat conducting member 50.

突出部５２のうち前記端面５２ａと反対側の面は、ジャケット６１に形成された段差部６１ａ（当接面）に当接する当接面５２ｂとして機能する。ジャケット６１は、溶接等により取付部材１６に固定されている。そして、クランプＫの他端は取付部材１６等に固定されている。   A surface of the protruding portion 52 opposite to the end surface 52 a functions as a contact surface 52 b that contacts a stepped portion 61 a (contact surface) formed in the jacket 61. The jacket 61 is fixed to the attachment member 16 by welding or the like. The other end of the clamp K is fixed to the mounting member 16 or the like.

したがって、ノズルホルダ２４の係止面２４ａに付勢されるクランプＫからの押付力により、ノズルホルダ２４のフランジ部２４Ｆ及び熱伝導部材５０の突出部５２は、ジャケット６１の段差部６１ａとクランプＫにより挟持されて固定されることとなる。   Therefore, the flange portion 24F of the nozzle holder 24 and the protruding portion 52 of the heat conducting member 50 are separated from the stepped portion 61a of the jacket 61 and the clamp K by the pressing force from the clamp K biased to the locking surface 24a of the nozzle holder 24. It will be clamped and fixed by.

熱伝導部材５０の突出部５２は、本体部５１の外面に沿って環状に延びる鍔状に形成されている。そして、上述のクランプＫからの押付力により、突出部５２の端面５２ａ及び当接面５２ｂは、フランジ部２４Ｆの当接面２４ｂ及びジャケット６１の段差部６１ａの各々と密着して排気が漏れ出ないようシールする。   The protruding portion 52 of the heat conducting member 50 is formed in a bowl shape extending in an annular shape along the outer surface of the main body portion 51. Then, due to the pressing force from the clamp K described above, the end surface 52a and the contact surface 52b of the projecting portion 52 are in close contact with the contact surface 24b of the flange portion 24F and the stepped portion 61a of the jacket 61, and exhaust gas leaks out. Seal so that it does not.

噴射弁２０は、触媒装置へ向かって尿素水を噴射するように排気管１０に対して傾けて、すなわち噴孔２５ｂを触媒の側へ向けて配設されている。このように噴射弁２０傾けて排気管１０に取り付けることを実現するために、排気管１０には分岐管１７（図１参照）が溶接等により傾けて接続され、この分岐管１７の端部に取付部材１６を取り付けている。したがって、分岐管１７の内部空間は、排気管１０の内壁から排気管径方向の外側に凹む形状の空間となり、排気通路１０ａの一部を構成するとともにボディの先端部２０ａ（図１参照）が収容される収容室１７ａとして機能する。なお、本実施形態に係るボディ先端部２０ａとは、ノズルホルダ２４及びノズルボディ２５のうち熱伝導部材５０から露出した部分のことを言う。   The injection valve 20 is inclined with respect to the exhaust pipe 10 so as to inject urea water toward the catalyst device, that is, the injection hole 25b is disposed toward the catalyst. In order to realize the injection valve 20 being inclined and attached to the exhaust pipe 10 in this way, a branch pipe 17 (see FIG. 1) is connected to the exhaust pipe 10 by being inclined by welding or the like, and is connected to the end of the branch pipe 17. The attachment member 16 is attached. Accordingly, the internal space of the branch pipe 17 is a space that is recessed from the inner wall of the exhaust pipe 10 to the outside in the exhaust pipe radial direction, constitutes a part of the exhaust passage 10a, and the front end portion 20a of the body (see FIG. 1). It functions as a storage chamber 17a to be stored. In addition, the body front-end | tip part 20a which concerns on this embodiment means the part exposed from the heat conductive member 50 among the nozzle holder 24 and the nozzle body 25. FIG.

このように、排気管径方向の外側に凹む形状の収容室１７ａにボディ先端部２０ａを収容することにより、排気通路１０ａを流れる排気の主流Ｙ１（図１参照）がボディ先端部２０ａに直接向かって流れてくることを回避する。よって、ボディ先端部２０ａが排気で加熱されることの低減を図っている。なお、排気の主流Ｙ１から分流した副流Ｙ２（図１参照）が収容室１７ａに流入してくるものの、当該副流Ｙ２は主流Ｙ１よりも熱エネルギが小さいため、ボディ先端部２０ａの高温化を抑制できる。   In this way, by housing the body front end portion 20a in the housing chamber 17a that is recessed outward in the exhaust pipe radial direction, the main flow Y1 (see FIG. 1) of the exhaust gas flowing through the exhaust passage 10a directly faces the body front end portion 20a. To avoid flowing. Therefore, reduction of the body tip portion 20a being heated by the exhaust gas is attempted. In addition, although the side stream Y2 (see FIG. 1) branched from the main stream Y1 of the exhaust flows into the storage chamber 17a, the side stream Y2 has lower thermal energy than the main stream Y1, and therefore the body tip 20a is heated to a high temperature. Can be suppressed.

さらに本実施形態では、このような副流Ｙ２がボディ先端部２０ａに直接衝突して高温化を招くことを回避すべく、ボディ先端部２０ａに対向配置されたプレート部材７０を設けている。プレート部材７０は、取付部材１６の貫通穴１６ａ全体を覆う円盤形状であり、プレート部材７０の中央部分である水平部７１には、噴孔２５ｂから噴射された尿素水を通過させる通過穴７０ａが形成されている。通過穴７０ａは、噴射弁２０の中心線Ｊ１と同軸に位置する円形である。   Furthermore, in this embodiment, in order to avoid such a side flow Y2 directly colliding with the body tip 20a and causing a high temperature, the plate member 70 disposed to face the body tip 20a is provided. The plate member 70 has a disk shape that covers the entire through hole 16a of the mounting member 16, and the horizontal portion 71, which is the central portion of the plate member 70, has a passage hole 70a through which urea water injected from the injection hole 25b passes. Is formed. The passage hole 70a has a circular shape that is coaxial with the center line J1 of the injection valve 20.

ここで、プレート部材７０の通過穴７０ａは、小さく設定するほど通過穴７０ａからボディ先端部２０ａに流入する排気の量を少なくでき、ボディ先端部２０ａの高温化抑制について有利である。しかしながらその背反として、噴射された尿素水が通過穴７０ａを通過できずにプレート部材７０と干渉するおそれが大きくなる。また、ボディ先端部２０ａを通過穴７０ａに近づけるほど前記干渉のおそれを小さくできるものの、ボディ先端部２０ａが排気に近づくこととなるためボディ先端部２０ａの高温化抑制について不利となる。   Here, the smaller the passage hole 70a of the plate member 70 is set, the smaller the amount of exhaust gas flowing from the passage hole 70a into the body front end portion 20a is, which is advantageous in suppressing the temperature rise of the body front end portion 20a. However, as a contradiction, the possibility that the injected urea water cannot pass through the passage hole 70a and interferes with the plate member 70 increases. Further, the closer the body tip 20a is to the passage hole 70a, the smaller the possibility of the interference, but the body tip 20a approaches exhaust, which is disadvantageous for suppressing the temperature rise of the body tip 20a.

これらの点を鑑み本発明者らが各種試験を行ったところ、通過穴７０ａの直径を４ｍｍ以下に形成することが、上述の干渉及び高温化抑制を図る上で望ましいことが分かった。なお、本実施形態では、図４に示すように噴孔２５ｂが通過穴７０ａ内部に位置している。   In view of these points, the present inventors conducted various tests and found that it is desirable to form the passage hole 70a with a diameter of 4 mm or less in order to suppress the above-described interference and high temperature. In the present embodiment, the nozzle hole 25b is located inside the passage hole 70a as shown in FIG.

また、プレート部材７０は、円盤形状の径方向外側から通過穴７０ａへ近づくにつれ噴射弁２０に近づく向きに凹む凹形状に形成されている。具体的には、プレート部材７０は、中心線Ｊ１に対して垂直に拡がる水平部７１及びフランジ７２と、これらの水平部７１及びフランジ７２を連結する傾斜部７３とを有する。   Moreover, the plate member 70 is formed in the concave shape dented in the direction which approaches the injection valve 20 as it approaches the passage hole 70a from the disk shape radial outside. Specifically, the plate member 70 includes a horizontal portion 71 and a flange 72 that extend perpendicularly to the center line J 1, and an inclined portion 73 that connects the horizontal portion 71 and the flange 72.

そして、水平部７１及び傾斜部７３のうち排気通路１０ａ側の面は、ボディ先端部２０ａに向かって流れてくる副流Ｙ２を、図１中の矢印Ｙ３に示すようにボディ先端部２０ａから逸らすよう偏向させる偏向面７０ｂとして機能する。   And the surface by the side of the exhaust passage 10a among the horizontal part 71 and the inclination part 73 diverts the side flow Y2 which flows toward the body front-end | tip part 20a from the body front-end | tip part 20a, as shown by the arrow Y3 in FIG. It functions as a deflecting surface 70b for deflecting.

偏向面７０ｂに沿う副流Ｙ３の流れを、図４に示すように矢印Ｙ３１，Ｙ３２，Ｙ３３に分けてより詳細に説明すると、取付部材１６の貫通穴１６ａ内部に流入する副流Ｙ３１は、傾斜部７３のうち通過穴７０ａに対して上流側に位置する部分にガイドされることにより、水平部７１に斜めに流入する。その後の副流Ｙ３２の向きは、水平部７１にガイドされることにより、中心線Ｊ１に対して垂直となる。これにより、水平部７１に沿って流れる副流Ｙ３２の殆どが、通過穴７０ａに流入することなく通過穴７０ａを通過して、傾斜部７３のうち通過穴７０ａに対して下流側に位置する部分に斜めに流入する。その後の副流Ｙ３３は、傾斜部７３にガイドされることにより貫通穴１６ａ外部に流出し、そのまま収容室１７ａ外部に流出して主流Ｙ１に合流する。   The flow of the substream Y3 along the deflection surface 70b will be described in more detail by dividing it into arrows Y31, Y32, Y33 as shown in FIG. 4, and the substream Y31 flowing into the through hole 16a of the mounting member 16 is inclined. By being guided by a portion of the portion 73 located on the upstream side with respect to the passage hole 70 a, the portion 73 flows obliquely into the horizontal portion 71. The direction of the subsequent side stream Y32 is perpendicular to the center line J1 by being guided by the horizontal portion 71. As a result, most of the secondary flow Y32 flowing along the horizontal portion 71 passes through the passage hole 70a without flowing into the passage hole 70a, and is a portion located on the downstream side of the passage hole 70a in the inclined portion 73. It flows in diagonally. The subsequent substream Y33 flows out of the through hole 16a by being guided by the inclined portion 73, flows out of the storage chamber 17a as it is, and joins the mainstream Y1.

プレート部材７０は、通過穴７０ａ内面とボディ先端部２０ａとの間に隙間Ｓ１が形成されるよう配置されるとともに、熱伝導部材５０及びジャケット６１とボディ先端部２０ａとの間に隙間Ｓ２が形成されるよう配置されている。プレート部材７０は、フランジ７２の端部を取付部材１６に溶接等により固定することで支持されている。プレート部材７０は、貫通穴１６ａから外部に出ることなく、貫通穴１６ａ内部に収容されている。   The plate member 70 is disposed so that a gap S1 is formed between the inner surface of the passage hole 70a and the body tip portion 20a, and a gap S2 is formed between the heat conducting member 50 and the jacket 61 and the body tip portion 20a. Arranged to be. The plate member 70 is supported by fixing the end of the flange 72 to the mounting member 16 by welding or the like. The plate member 70 is accommodated in the through hole 16a without coming out of the through hole 16a.

プレート部材７０の材質には、噴射された尿素水に対する耐腐食性を有する材質が望ましい。また、高温の排気にさらされるため、耐熱性に優れた材質が望ましい。そこで本実施形態では、プレート部材７０をステンレス製としている。   The material of the plate member 70 is preferably a material having corrosion resistance against the injected urea water. Moreover, since it is exposed to high-temperature exhaust, a material having excellent heat resistance is desirable. Therefore, in this embodiment, the plate member 70 is made of stainless steel.

以上詳述した本実施形態によれば、以下の効果が得られるようになる。   According to the embodiment described in detail above, the following effects can be obtained.

（１）ボディ先端部２０ａに対向配置されたプレート部材７０を設け、このプレート部材７０により取付部材１６の貫通穴１６ａ全体を覆う。そして、プレート部材７０の水平部７１及び傾斜部７３による偏向面７０ｂが、排気主流Ｙ１から分岐してボディ先端部２０ａに向かって流れてくる副流Ｙ２を、図１中の矢印Ｙ３に示すようにボディ先端部２０ａから逸らすよう偏向させる。よって、排気流Ｙ３がボディ先端部２０ａに直接衝突することを抑制できるので、ボディ先端部２０ａが排気流Ｙ３によって高温になることを抑制できる。よって、ボディ先端部２０ａの硬度低下及びデポジット付着の懸念を低減できる。   (1) A plate member 70 disposed opposite to the body tip 20a is provided, and the entire through hole 16a of the mounting member 16 is covered with the plate member 70. Then, a side flow Y2 in which the deflection surface 70b by the horizontal portion 71 and the inclined portion 73 of the plate member 70 branches from the exhaust main flow Y1 and flows toward the body front end portion 20a is indicated by an arrow Y3 in FIG. To be deflected away from the body tip 20a. Therefore, since it can suppress that exhaust flow Y3 collides directly with body tip part 20a, it can control that body tip part 20a becomes high temperature by exhaust flow Y3. Therefore, it is possible to reduce the concern about the decrease in the hardness of the body tip portion 20a and the deposit adhesion.

（２）プレート部材７０は、ボディ先端部２０ａとの間に隙間Ｓ１を形成するよう配置される。そのため、高温の排気Ｙ３にさらされて加熱されたプレート部材７０の熱が、ボディ先端部２０ａに伝熱して加熱してしまうことを回避できる。よって、ボディ先端部２０ａの高温化抑制を促進できる。   (2) The plate member 70 is disposed so as to form a gap S1 with the body tip portion 20a. Therefore, it can be avoided that the heat of the plate member 70 that is heated by being exposed to the high-temperature exhaust Y3 is transferred to the body tip portion 20a and heated. Therefore, it is possible to promote the suppression of the high temperature of the body tip portion 20a.

（３）プレート部材７０は、熱伝導部材５０及びジャケット６１とボディ先端部２０ａとの間に隙間Ｓ２を形成するよう配置される。そのため、高温の排気Ｙ３にさらされて加熱されたプレート部材７０の熱が、熱伝導部材５０及びジャケット６１に伝熱して加熱してしまうことを回避できる。よって、熱伝導部材５０及び冷却手段６０によるボディ先端部２０ａの冷却効果が低下することを抑制でき、ボディ先端部２０ａの高温化抑制を促進できる。   (3) The plate member 70 is disposed so as to form a gap S2 between the heat conducting member 50 and the jacket 61 and the body tip portion 20a. Therefore, it can be avoided that the heat of the plate member 70 heated by being exposed to the high-temperature exhaust Y3 is transferred to the heat conducting member 50 and the jacket 61 and heated. Therefore, it can suppress that the cooling effect of the body front-end | tip part 20a by the heat conductive member 50 and the cooling means 60 falls, and can suppress the high temperature suppression of the body front-end | tip part 20a.

（４）プレート部材７０は、取付部材１６の貫通穴１６ａ全体を覆う形状であるため、ボディ先端部２０ａに加え熱伝導部材５０及びジャケット６１もプレート部材７０により覆われることとなる。よって、熱伝導部材５０及びジャケット６１に排気流Ｙ３が直接衝突することをも抑制できるので、熱伝導部材５０及び冷却手段６０によるボディ先端部２０ａの冷却効果低下を抑制でき、ボディ先端部２０ａの高温化抑制を促進できる。   (4) Since the plate member 70 has a shape that covers the entire through hole 16 a of the mounting member 16, the heat conducting member 50 and the jacket 61 are also covered with the plate member 70 in addition to the body tip portion 20 a. Therefore, since it is possible to suppress the exhaust flow Y3 from directly colliding with the heat conducting member 50 and the jacket 61, it is possible to suppress a decrease in the cooling effect of the body tip portion 20a by the heat conducting member 50 and the cooling means 60, and the body tip portion 20a. High temperature suppression can be promoted.

（５）ジャケット６１とノズルホルダ２４との間に熱伝導部材５０を配置する。そのため、ノズルホルダ２４及びノズルボディ２５により構成されるボディ先端部２０ａの熱の一部は、熱伝導部材５０に伝導された後、熱伝導部材５０内部にて反先端部側に伝導される。そして、熱伝導部材５０の材質をノズルホルダ２４に比べて高熱伝導率の材質にしているので、熱伝導部材５０が無い場合におけるノズルホルダ２４の軸方向熱分布に比べ、熱伝導部材５０の軸方向熱分布は均一化される。よって、熱伝導部材５０が無い場合におけるノズルホルダ２４から冷却手段６０への伝熱量（熱移動量）に比べ、熱伝導部材５０から冷却手段６０への伝熱量を増大でき、ひいてはボディ先端部２０ａを効率良く冷却できる。   (5) The heat conducting member 50 is disposed between the jacket 61 and the nozzle holder 24. Therefore, part of the heat of the body tip portion 20 a configured by the nozzle holder 24 and the nozzle body 25 is conducted to the heat conducting member 50 and then conducted to the opposite tip side inside the heat conducting member 50. Since the material of the heat conducting member 50 is made of a material having a higher thermal conductivity than that of the nozzle holder 24, the shaft of the heat conducting member 50 is compared with the axial heat distribution of the nozzle holder 24 when there is no heat conducting member 50. The directional heat distribution is made uniform. Therefore, compared with the heat transfer amount (heat transfer amount) from the nozzle holder 24 to the cooling means 60 when there is no heat conduction member 50, the heat transfer amount from the heat conduction member 50 to the cooling means 60 can be increased, and as a result, the body tip 20a. Can be cooled efficiently.

（第２実施形態）
上記第１実施形態では、ストレート形状の排気管１０部分に噴射弁２０を配置しているのに対し、本実施形態では、図５に示すようにエルボ形状の排気管１０１部分に噴射弁２０を配置している。そのため、上記第１実施形態に係る噴射弁２０は、触媒装置へ向かって尿素水を噴射するように排気管１０に対して傾けて配設する必要があるのに対し、本実施形態に係る噴射弁２０は、排気管１０１に対して垂直に配設することができる。よって、分岐管１７を廃止して、取付部材１６を排気管１０１に直接取り付けることができる。 (Second Embodiment)
In the first embodiment, the injection valve 20 is disposed in the straight exhaust pipe 10 portion, whereas in the present embodiment, the injection valve 20 is disposed in the elbow exhaust pipe 101 portion as shown in FIG. It is arranged. Therefore, the injection valve 20 according to the first embodiment needs to be disposed to be inclined with respect to the exhaust pipe 10 so as to inject urea water toward the catalyst device, whereas the injection valve according to the present embodiment. The valve 20 can be disposed perpendicular to the exhaust pipe 101. Therefore, the branch pipe 17 can be eliminated and the attachment member 16 can be directly attached to the exhaust pipe 101.

このようなエルボ形状の排気管１０１部分に噴射弁２０を配置した本実施形態の場合であっても、上記第１実施形態と同様にして、ボディ先端部２０ａに対向配置されたプレート部材７０が、排気主流Ｙ１０から分岐してボディ先端部２０ａに向かって流れてくる副流Ｙ２０を、図５中の矢印Ｙ２０に示すようにボディ先端部２０ａから逸らすよう偏向させる。よって、排気流Ｙ２０がボディ先端部２０ａに直接衝突することを抑制できるので、ボディ先端部２０ａが排気流Ｙ２０によって高温になることを抑制できる。   Even in the case of the present embodiment in which the injection valve 20 is disposed in such an elbow-shaped exhaust pipe 101 portion, the plate member 70 disposed to face the body tip portion 20a is provided in the same manner as in the first embodiment. Then, the side flow Y20 branched from the exhaust main flow Y10 and flowing toward the body front end portion 20a is deflected so as to be deflected from the body front end portion 20a as indicated by an arrow Y20 in FIG. Therefore, since it can suppress that exhaust flow Y20 collides directly with body tip part 20a, it can control that body tip part 20a becomes high temperature by exhaust flow Y20.

（第３実施形態）
図６（ａ）は上記第１実施形態に係るプレート部材７０の形状を示し、図６（ｂ）（ｃ）はその変形例として、本実施形態に係るプレート部材７０１，７０２の形状を示す図である。図６（ｂ）に示すプレート部材７０１は、図６（ａ）に示すプレート部材７０の水平部７１及び傾斜部７３を円弧部７１１に変形させており、円弧部７１１及びフランジ７２から構成された円盤形状である。円弧部７１１には通過穴７０ａが形成されており、円盤形状の径方向外側から通過穴７０ａへ近づくにつれ噴射弁２０に近づく向きに凹む凹形状に形成されている。 (Third embodiment)
FIG. 6A shows the shape of the plate member 70 according to the first embodiment, and FIGS. 6B and 6C show the shapes of the plate members 701 and 702 according to the present embodiment as modifications thereof. It is. A plate member 701 shown in FIG. 6B has a horizontal portion 71 and an inclined portion 73 of the plate member 70 shown in FIG. 6A deformed into an arc portion 711, and is constituted by an arc portion 711 and a flange 72. It is a disk shape. The circular arc portion 711 is formed with a passage hole 70a, and is formed in a concave shape that is recessed toward the injection valve 20 as it approaches the passage hole 70a from the outside of the disk shape in the radial direction.

そして、円弧部７１１のうち排気通路１０ａ側の面は、取付部材１６の貫通穴１６ａ内部に流入してボディ先端部２０ａに向かって流れてくる副流Ｙ２を、図６（ｂ）中の矢印Ｙ３０１に示すようにボディ先端部２０ａから逸らすよう偏向させる偏向面として機能する。図６（ａ）のプレート部材７０によれば、傾斜部７３にガイドされた副流Ｙ３１が水平部７１に衝突するのに対し、図６（ｂ）のプレート部材７０１によれば、円弧部７１１を有することにより前記衝突を緩和できる。但し、図６（ａ）のプレート部材７０では、中心線Ｊ１に対して垂直となる水平部７１を有することにより、水平部７１に沿って流れる副流Ｙ３２が通過穴７０ａを通過しやすくなるので、副流Ｙ３２の殆どが通過穴７０ａに流入することなく通過穴７０ａを通過するように図ることができる。   Then, the surface on the exhaust passage 10a side of the circular arc portion 711 causes the secondary flow Y2 flowing into the through hole 16a of the mounting member 16 and flowing toward the body distal end portion 20a, as indicated by an arrow in FIG. As indicated by Y301, it functions as a deflection surface that deflects the body tip 20a so as to be deflected. According to the plate member 70 of FIG. 6A, the side flow Y31 guided by the inclined portion 73 collides with the horizontal portion 71, whereas according to the plate member 701 of FIG. 6B, the arc portion 711. The collision can be mitigated. However, the plate member 70 of FIG. 6A has the horizontal portion 71 that is perpendicular to the center line J1, so that the secondary flow Y32 that flows along the horizontal portion 71 can easily pass through the passage hole 70a. Thus, most of the secondary flow Y32 can pass through the passage hole 70a without flowing into the passage hole 70a.

図６（ｃ）に示すプレート部材７０２は、図６（ａ）に示すプレート部材７０の水平部７１を円弧部７１２に変形させており、円弧部７１２、傾斜部７３及びフランジ７２から構成された円盤形状である。円弧部７１２には通過穴７０ａが形成されており、傾斜部７３については、円盤形状の径方向外側から通過穴７０ａへ近づくにつれ噴射弁２０に近づく向きに凹む凹形状に形成され、円弧部７１２については、円盤形状の径方向外側から通過穴７０ａへ近づくにつれ噴射弁２０から遠ざかる向きに突出する凸形状に形成されている。   A plate member 702 shown in FIG. 6C is formed by deforming the horizontal portion 71 of the plate member 70 shown in FIG. 6A into an arc portion 712, and includes an arc portion 712, an inclined portion 73, and a flange 72. It is a disk shape. The circular arc portion 712 is formed with a passage hole 70a, and the inclined portion 73 is formed in a concave shape that is recessed toward the injection valve 20 as it approaches the passage hole 70a from the radially outer side of the disk shape. Is formed in a convex shape that protrudes away from the injection valve 20 as it approaches the passage hole 70a from the radially outer side of the disk shape.

そして、円弧部７１２及び傾斜部７３のうち排気通路１０ａ側の面は、取付部材１６の貫通穴１６ａ内部に流入してボディ先端部２０ａに向かって流れてくる副流Ｙ２を、図６（ｃ）中の矢印Ｙ３０２に示すようにボディ先端部２０ａから逸らすよう偏向させる偏向面として機能する。このプレート部材７０２によれば、傾斜部７３にガイドされた副流Ｙ３０２は、円弧部７１２にガイドされて排気通路１０ａ側に戻すように偏向される。   Then, the surface on the exhaust passage 10a side of the arc portion 712 and the inclined portion 73 flows into the through hole 16a of the mounting member 16 and the side flow Y2 flowing toward the body distal end portion 20a is shown in FIG. ) Functions as a deflecting surface that deflects away from the body tip 20a as indicated by an arrow Y302. According to this plate member 702, the side flow Y302 guided by the inclined portion 73 is deflected so as to be guided by the arc portion 712 and returned to the exhaust passage 10a side.

（第４実施形態）
図７（ａ）（ｂ）（ｃ）は、上記第３実施形態に係るプレート部材７０の変形例として、本実施形態に係るプレート部材７０３，７０４，７０５の形状を示す図である。図７（ａ）に示すプレート部材７０３は図６（ａ）のプレート部材７０を、図７（ｂ）に示すプレート部材７０４は図６（ｂ）のプレート部材７０１を、図７（ｃ）に示すプレート部材７０５は図６（ｃ）のプレート部材７０２を、それぞれ表裏反転させた形状である。 (Fourth embodiment)
FIGS. 7A, 7B, and 7C are views showing the shapes of plate members 703, 704, and 705 according to the present embodiment as modifications of the plate member 70 according to the third embodiment. The plate member 703 shown in FIG. 7 (a) is the plate member 70 shown in FIG. 6 (a), the plate member 704 shown in FIG. 7 (b) is the plate member 701 shown in FIG. 6 (b), and FIG. The plate member 705 shown has a shape obtained by inverting the plate member 702 of FIG.

そして、図６に示すプレート部材７０，７０１，７０２が、円盤形状の径方向外側から通過穴７０ａへ近づくにつれ噴射弁２０に近づく向きに凹む凹形状であるのに対し、図７に示すプレート部材７０３，７０４，７０５は、円盤形状の径方向外側から通過穴７０ａへ近づくにつれ噴射弁２０から遠ざかる向きに突出する凸形状である。   The plate members 70, 701, and 702 shown in FIG. 6 have a concave shape that is recessed toward the injection valve 20 from the radially outer side of the disk shape toward the passage hole 70a, whereas the plate members shown in FIG. Reference numerals 703, 704, and 705 denote convex shapes that protrude in a direction away from the injection valve 20 as they approach the passage hole 70a from the outer side of the disk shape in the radial direction.

プレート部材７０３の水平部７１３及び傾斜部７３３のうち排気通路１０ａ側の面は、取付部材１６の貫通穴１６ａ内部に流入してボディ先端部２０ａに向かって流れてくる副流Ｙ２を、図７（ａ）中の矢印Ｙ３０３に示すようにボディ先端部２０ａから逸らすよう偏向させる偏向面として機能する。プレート部材７０４の円弧部７１４のうち排気通路１０ａ側の面は、取付部材１６の貫通穴１６ａ内部に流入してボディ先端部２０ａに向かって流れてくる副流Ｙ２を、図７（ｂ）中の矢印Ｙ３０４に示すようにボディ先端部２０ａから逸らすよう偏向させる偏向面として機能する。プレート部材７０５の円弧部７１５及び傾斜部７３５のうち排気通路１０ａ側の面は、取付部材１６の貫通穴１６ａ内部に流入してボディ先端部２０ａに向かって流れてくる副流Ｙ２を、図７（ｃ）中の矢印Ｙ３０５に示すようにボディ先端部２０ａから逸らすよう偏向させる偏向面として機能する。   Of the horizontal portion 713 and the inclined portion 733 of the plate member 703, the surface on the exhaust passage 10a side flows into the through hole 16a of the mounting member 16 and flows into the body front end portion 20a as a side flow Y2 as shown in FIG. As shown by an arrow Y303 in (a), it functions as a deflection surface that deflects the body tip 20a so as to be deflected. The surface on the exhaust passage 10a side of the circular arc portion 714 of the plate member 704 causes a substream Y2 flowing into the through hole 16a of the mounting member 16 and flowing toward the body tip portion 20a in FIG. As shown by an arrow Y304, it functions as a deflecting surface that deflects the body tip 20a away from the tip 20a. Of the arc portion 715 and the inclined portion 735 of the plate member 705, the surface on the exhaust passage 10a side flows into the through hole 16a of the mounting member 16 and the side flow Y2 flowing toward the body distal end portion 20a is shown in FIG. It functions as a deflecting surface that deflects the body tip 20a away from the body tip 20a as indicated by an arrow Y305 in (c).

また、図６に示すプレート部材７０，７０１，７０２は、図１に示すように主流Ｙ１が直接流入することのない収容室１７ａに配置しているのに対し、図７に示すプレート部材７０３，７０４，７０５は、収容室１７ａに配置してもよいし、分岐管１７を廃止して排気通路１０ａに直接配置するようにしてもよい。この場合、排気通路１０ａを流れる排気の主流Ｙ１が、プレート部材７０３，７０４，７０５によりボディ先端部２０ａから逸れるよう偏向されることとなる。   Further, the plate members 70, 701 and 702 shown in FIG. 6 are arranged in the accommodating chamber 17a where the main flow Y1 does not directly flow in as shown in FIG. 1, whereas the plate members 703 and 703 shown in FIG. 704 and 705 may be disposed in the accommodation chamber 17a, or may be disposed directly in the exhaust passage 10a without the branch pipe 17. In this case, the main flow Y1 of the exhaust gas flowing through the exhaust passage 10a is deflected by the plate members 703, 704, and 705 so as to deviate from the body tip portion 20a.

（他の実施形態）
上記各実施形態は、以下のように変更して実施してもよい。また、本発明は上記実施形態の記載内容に限定されず、各実施形態の特徴的構造をそれぞれ任意に組み合わせるようにしてもよい。 (Other embodiments)
The above embodiments may be implemented with the following modifications. Further, the present invention is not limited to the description of the above embodiment, and the characteristic structures of the embodiments may be arbitrarily combined.

・図４に示す上記実施形態では、通過穴７０ａ内面とボディ先端部２０ａとの間に隙間Ｓ１が形成されるようプレート部材７０を配置しているが、通過穴７０ａ内面とボディ先端部２０ａとが接触するようにプレート部材７０を配置してもよい。この場合には、ボディ先端部２０ａと通過穴７０ａ内面との接触状態が面接触ではなく線接触となるよう配置して、プレート部材７０からボディ先端部２０ａへの伝熱抑制を図ることが望ましい。   In the above embodiment shown in FIG. 4, the plate member 70 is disposed so that the gap S1 is formed between the inner surface of the passage hole 70a and the body tip portion 20a, but the inner surface of the passage hole 70a and the body tip portion 20a You may arrange | position the plate member 70 so that may contact. In this case, it is desirable that the contact state between the body tip portion 20a and the inner surface of the passage hole 70a is not a surface contact but a line contact so as to suppress heat transfer from the plate member 70 to the body tip portion 20a. .

・上記実施形態では、尿素水を添加剤として噴射する噴射弁２０を対象としているが、本発明では、尿素水を噴射する噴射弁に限定されるものではなく、例えば、炭化水素（ＨＣ）を添加剤として噴射する噴射弁に適用させてもよい。また、触媒装置におけるＮＯｘの還元に用いる添加剤を噴射させる噴射弁に限定されるものではなく、例えば、排気中のＰＭ（Particulate Matter、粒子状物質）を捕集するＤＰＦ（Diesel Particulate Filter）にてＰＭを燃焼させるためのＨＣを噴射させる噴射弁に適用させてもよい。   -In the said embodiment, although the injection valve 20 which injects urea water as an additive is object, in this invention, it is not limited to the injection valve which injects urea water, For example, hydrocarbon (HC) is injected. You may make it apply to the injection valve which injects as an additive. Moreover, it is not limited to the injection valve which injects the additive used for the reduction | restoration of NOx in a catalyst apparatus, For example, in DPF (Diesel Particulate Filter) which collects PM (Particulate Matter, particulate matter) in exhaust gas, for example The present invention may be applied to an injection valve that injects HC for burning PM.

・図４に示す上記実施形態では、熱伝導部材５０及びジャケット６１とボディ先端部２０ａとの間に隙間Ｓ２が形成されるようプレート部材７０を配置しているが、熱伝導部材５０又はジャケット６１とボディ先端部２０ａとが接触するようにプレート部材７０を配置してもよい。この場合においても、ボディ先端部２０ａとの接触状態が面接触ではなく線接触となるよう配置して、プレート部材７０から熱伝導部材５０又はジャケット６１への伝熱抑制を図ることが望ましい。   In the above-described embodiment shown in FIG. 4, the plate member 70 is disposed so that the gap S2 is formed between the heat conducting member 50 and the jacket 61 and the body tip portion 20a, but the heat conducting member 50 or the jacket 61 is disposed. The plate member 70 may be disposed so that the front end portion 20a contacts the body. Even in this case, it is desirable to arrange the contact state with the body tip portion 20a to be a line contact instead of a surface contact so as to suppress heat transfer from the plate member 70 to the heat conducting member 50 or the jacket 61.

・図２に示す上記実施形態では、特許請求の範囲に記載の「ボディ」を、別々に加工されたノズルホルダ２４及びノズルボディ２５により構成しているが、ノズルホルダ２４及びノズルボディ２５を一体的に加工して構成してもよい。   In the embodiment shown in FIG. 2, the “body” described in the claims is configured by the nozzle holder 24 and the nozzle body 25 processed separately, but the nozzle holder 24 and the nozzle body 25 are integrated. Alternatively, it may be processed.

・図４に示す上記実施形態では、噴孔２５ｂを通過穴７０ａ内部に位置させているが、噴孔２５ｂを通過穴７０ａ外部（冷却手段６０の側の外部）に位置させてもよい。   In the embodiment shown in FIG. 4, the nozzle hole 25b is positioned inside the passage hole 70a. However, the nozzle hole 25b may be positioned outside the passage hole 70a (outside of the cooling means 60).

・図４に示す上記実施形態では、ノズルホルダ２４と冷却手段６０との間に熱伝導部材５０を配置しているが、当該熱伝導部材５０を廃止して、冷却手段６０のジャケット６１をノズルホルダ２４に直接接触させるように構成してもよい。   In the embodiment shown in FIG. 4, the heat conducting member 50 is disposed between the nozzle holder 24 and the cooling means 60, but the heat conducting member 50 is eliminated and the jacket 61 of the cooling means 60 is replaced with the nozzle. You may comprise so that it may contact the holder 24 directly.

・図４に示す熱伝導部材５０は、ジャケット６１内の冷却液に直接触れることなくジャケット６１と接触するよう配置されている。これに対し、熱伝導部材５０の少なくとも一部分（例えば突出部５２）が、ジャケット６１内部の冷却通路６２に配置されて冷却液に直接冷却されるよう構成してもよい。これによれば、熱伝導部材５０が冷却液により冷却される度合いを向上できる。但し、噴射弁２０を洗浄する等のメンテナンスを行うにあたり、熱伝導部材５０とともに噴射弁２０をジャケット６１から取り外す時には、冷却液が漏れ出てしまうことを回避すべく、前記取り外しの作業に先立って冷却液を一旦抜き出す作業を要する。これに対し、図４に示す熱伝導部材５０は冷却液に直接触れることなくジャケット６１と接触するよう配置されているので、上述の冷却液抜出作業を不要にしつつ、熱伝導部材５０とともに噴射弁２０をジャケット６１から取り外すことができる。   The heat conducting member 50 shown in FIG. 4 is disposed so as to contact the jacket 61 without directly touching the coolant in the jacket 61. On the other hand, at least a part of the heat conducting member 50 (for example, the protrusion 52) may be arranged in the cooling passage 62 inside the jacket 61 and directly cooled by the coolant. According to this, the degree to which the heat conducting member 50 is cooled by the coolant can be improved. However, when performing the maintenance such as cleaning the injection valve 20, when removing the injection valve 20 from the jacket 61 together with the heat conducting member 50, prior to the removal operation, in order to avoid leakage of the coolant. The operation of extracting the coolant once is required. On the other hand, since the heat conducting member 50 shown in FIG. 4 is arranged so as to contact the jacket 61 without directly touching the coolant, the heat conducting member 50 is jetted together with the above-described operation of removing the coolant. The valve 20 can be removed from the jacket 61.

本発明の第１実施形態に係る噴射弁が適用された、排気浄化装置を示す模式図。The schematic diagram which shows the exhaust gas purification device to which the injection valve which concerns on 1st Embodiment of this invention was applied. 図１の噴射弁を示す断面図。Sectional drawing which shows the injection valve of FIG. 図２の拡大図。The enlarged view of FIG. 図１の拡大図。The enlarged view of FIG. 本発明の第２実施形態に係る噴射弁の搭載構造を示す模式図。The schematic diagram which shows the mounting structure of the injection valve which concerns on 2nd Embodiment of this invention. （ａ）は第１実施形態に係るプレート部材の形状を、（ｂ）（ｃ）は本発明の第３実施形態に係るプレート部材の形状を示す模式図。(A) is a schematic diagram which shows the shape of the plate member which concerns on 1st Embodiment, (b) (c) shows the shape of the plate member which concerns on 3rd Embodiment of this invention. 本発明の第４実施形態に係るプレート部材の形状を示す模式図。The schematic diagram which shows the shape of the plate member which concerns on 4th Embodiment of this invention.

符号の説明Explanation of symbols

１０ａ…排気通路、１７ａ…収容室、２０…噴射弁、２４…ノズルホルダ（ボディ先端部）、２５…ノズルボディ（ボディ先端部）、２５ｂ…噴孔、２６…ニードル（弁体）、２７…尿素水通路（添加剤通路）、７０，７０１〜７０５…プレート部材、７０ｂ…偏向面、６０…冷却手段、７０ａ…通過穴。   DESCRIPTION OF SYMBOLS 10a ... Exhaust passage, 17a ... Accommodating chamber, 20 ... Injection valve, 24 ... Nozzle holder (body tip), 25 ... Nozzle body (body tip), 25b ... Injection hole, 26 ... Needle (valve), 27 ... Urea water passage (additive passage), 70, 701 to 705 ... plate member, 70b ... deflection surface, 60 ... cooling means, 70a ... passage hole.

Claims (6)

添加剤を噴射する噴孔が形成されたボディ、及び前記ボディ内部に収容されて前記噴孔に通じる添加剤通路を開閉する弁体を有し、前記噴孔が内燃機関の排気通路に位置するよう搭載されるとともに、前記噴孔から前記排気通路へ前記添加剤を噴射する噴射弁と、
前記ボディのうち前記噴孔を形成する部位であるボディ先端部に対向するよう配置されるとともに、前記噴孔から噴射された添加剤を通過させる通過穴が形成されたプレート部材と、
を備え、
前記プレート部材には、前記排気通路を流れる排気のうち前記ボディ先端部に向かって流れてくる排気流を前記ボディ先端部から逸らすよう偏向させる偏向面が形成されており、
前記偏向面は、前記通過穴へ近づくにつれ前記噴射弁へ近づく向きに凹む凹形状に形成されていることを特徴とする噴射弁の搭載構造。 A body formed with an injection hole for injecting the additive, and a valve body that is accommodated in the body and opens and closes an additive passage that communicates with the injection hole, and the injection hole is located in an exhaust passage of the internal combustion engine; An injection valve that injects the additive from the nozzle hole into the exhaust passage;
A plate member that is disposed so as to face a body tip portion that is a portion that forms the nozzle hole in the body, and that has a passage hole through which an additive injected from the nozzle hole is passed;
With
The plate member is formed with a deflection surface for deflecting the exhaust flow flowing toward the body tip portion of the exhaust gas flowing through the exhaust passage so as to be deflected from the body tip portion ,
The mounting structure for an injection valve, wherein the deflection surface is formed in a concave shape that is recessed toward the injection valve as it approaches the passage hole . 前記排気通路を内部に形成する排気管には、当該排気管の内壁から排気管径方向の外側に凹む収容室が形成され、
前記収容室には前記ボディ先端部が収容され、
前記偏向面は、前記排気通路内を流れる排気の主流から分流して前記収容室内に流入した副流を、前記ボディ先端部から逸らすよう偏向させることを特徴とする請求項１に記載の噴射弁の搭載構造。 The exhaust pipe that forms the exhaust passage therein is formed with a storage chamber that is recessed outward from the inner wall of the exhaust pipe in the radial direction of the exhaust pipe.
The body tip is housed in the housing chamber,
2. The injection valve according to claim 1 , wherein the deflecting surface deflects a side flow that is diverted from a main flow of exhaust gas flowing in the exhaust passage and flows into the housing chamber so as to be deflected from the front end portion of the body. Mounting structure. 添加剤を噴射する噴孔が形成されたボディ、及び前記ボディ内部に収容されて前記噴孔に通じる添加剤通路を開閉する弁体を有し、前記噴孔が内燃機関の排気通路に位置するよう搭載されるとともに、前記噴孔から前記排気通路へ前記添加剤を噴射する噴射弁と、A body formed with an injection hole for injecting the additive, and a valve body that is accommodated in the body and opens and closes an additive passage that communicates with the injection hole, and the injection hole is located in an exhaust passage of the internal combustion engine; An injection valve that injects the additive from the nozzle hole into the exhaust passage;
前記ボディのうち前記噴孔を形成する部位であるボディ先端部に対向するよう配置されるとともに、前記噴孔から噴射された添加剤を通過させる通過穴が形成されたプレート部材と、A plate member that is disposed so as to face a body tip portion that is a portion that forms the nozzle hole in the body, and that has a passage hole through which an additive injected from the nozzle hole is passed;
を備え、With
前記排気通路を内部に形成する排気管には、当該排気管の内壁から排気管径方向の外側に凹む収容室が形成され、The exhaust pipe that forms the exhaust passage therein is formed with a storage chamber that is recessed outward from the inner wall of the exhaust pipe in the radial direction of the exhaust pipe.
前記収容室には前記ボディ先端部が収容され、The body tip is housed in the housing chamber,
前記プレート部材には、前記排気通路内を流れる排気の主流から分流して前記収容室内に流入した副流を、前記ボディ先端部から逸らすよう偏向させる偏向面が形成されており、The plate member is formed with a deflecting surface that deflects the side flow that is diverted from the main flow of the exhaust flowing in the exhaust passage and flows into the housing chamber from the front end of the body,
前記偏向面は、前記通過穴へ近づくにつれ前記噴射弁から遠ざかる向きに突出する凸形状に形成されていることを特徴とする噴射弁の搭載構造。The mounting structure for an injection valve, wherein the deflection surface is formed in a convex shape protruding in a direction away from the injection valve as it approaches the passage hole. 前記プレート部材は、前記ボディとの間に隙間を有するよう、或いは前記ボディと線接触するよう配置されていることを特徴とする請求項１〜３のいずれか１つに記載の噴射弁の搭載構造。 The mounting of the injection valve according to any one of claims 1 to 3 , wherein the plate member is disposed so as to have a gap with the body or in line contact with the body. Construction. 前記噴射弁の近傍には前記ボディを冷却する冷却手段が備えられており、
前記プレート部材は、前記冷却手段との間に隙間を有するよう、或いは前記冷却手段と線接触するよう配置されていることを特徴とする請求項１〜４のいずれか１つに記載の噴射弁の搭載構造。 Cooling means for cooling the body is provided in the vicinity of the injection valve,
Said plate member, said to have a gap between the cooling means or the cooling means and a line, characterized in that it is placed in contact claim 1 injector according to any one of 4 Mounting structure. 前記通過穴は、直径が４ｍｍ以下に形成された円形であることを特徴とする請求項１〜５のいずれか１つに記載の噴射弁の搭載構造。 The passage holes, mounting structure of the injection valve according to any one of claims 1-5, characterized in that the circular diameter is formed in 4mm or less.
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