JP7282513B2 - Reductant supply device and cooling holder - Google Patents

Reductant supply device and cooling holder Download PDF

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JP7282513B2
JP7282513B2 JP2018238883A JP2018238883A JP7282513B2 JP 7282513 B2 JP7282513 B2 JP 7282513B2 JP 2018238883 A JP2018238883 A JP 2018238883A JP 2018238883 A JP2018238883 A JP 2018238883A JP 7282513 B2 JP7282513 B2 JP 7282513B2
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cooling medium
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賢一 飯野
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Robert Bosch GmbH
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    • 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
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Description

本発明は、還元剤供給装置及び冷却ホルダに関する。 The present invention relates to a reducing agent supply device and a cooling holder.

ディーゼルエンジン等の内燃機関の排気中にはＮＯX（窒素酸化物）が含まれる。かかるＮＯXを還元して窒素や水等に分解することにより排気を浄化する装置として、尿素ＳＣＲ（Selective Catalystic Reduction）システムが実用化されている。尿素ＳＣＲシステムは、還元剤として尿素水溶液を使用し、尿素水溶液が分解することにより生成されるアンモニアを排気中のＮＯXと反応させることによりＮＯXを分解する。 NOx (nitrogen oxides) is contained in exhaust gas from internal combustion engines such as diesel engines. A urea SCR (Selective Catalytic Reduction) system has been put into practical use as a device for purifying exhaust gas by reducing such NOx and decomposing it into nitrogen, water, and the like. The urea SCR system uses a urea aqueous solution as a reducing agent, and decomposes NO x by reacting ammonia generated by decomposition of the urea aqueous solution with NO x in the exhaust gas.

かかる尿素ＳＣＲシステムは、排気通路に配設された選択還元触媒と、選択還元触媒よりも上流側で排気中に尿素水溶液を供給する還元剤供給装置とを備える。選択還元触媒は、尿素水溶液が分解することにより生成されるアンモニアを吸着し、流入する排気中のＮＯXとアンモニアとの還元反応を促進する機能を有する。また、還元剤供給装置は、貯蔵タンク内に収容された尿素水溶液を吸い込んで吐出するポンプと、ポンプにより圧送される尿素水溶液を噴射する噴射弁とを備える。 Such a urea SCR system includes a selective reduction catalyst arranged in an exhaust passage, and a reducing agent supply device that supplies an aqueous urea solution into exhaust gas upstream of the selective reduction catalyst. The selective reduction catalyst has a function of adsorbing ammonia generated by decomposition of the aqueous urea solution and promoting a reduction reaction between NO x in the inflowing exhaust gas and ammonia. Further, the reducing agent supply device includes a pump that sucks and discharges the urea aqueous solution contained in the storage tank, and an injection valve that injects the urea aqueous solution pressure-fed by the pump.

ここで、噴射弁は、内燃機関の排気管に取り付けて使用されるため、排気熱を受けやすい。噴射弁が排気熱を受けると、噴射弁の故障や、尿素水溶液の結晶化が生じやすくなって、尿素水溶液の噴射が適切に行われなくなるおそれがある。これに対して、例えば特許文献１には、噴射弁の周囲を囲むようにした冷却室を設け、冷却室に冷却媒体を循環させることで噴射弁の冷却を行う技術が開示されている。 Here, since the injection valve is attached to the exhaust pipe of the internal combustion engine for use, it is susceptible to exhaust heat. When the injection valve receives the heat of the exhaust gas, the injection valve is likely to malfunction or the urea aqueous solution is likely to crystallize, which may prevent the urea aqueous solution from being properly injected. In response to this, for example, Patent Document 1 discloses a technique of cooling the injection valve by providing a cooling chamber surrounding the injection valve and circulating a cooling medium in the cooling chamber.

国際公開第２０１４／１９６３４６号WO2014/196346

しかしながら、冷却室において、冷却媒体の流れる方向が不均一になると、冷却媒体による熱交換効率が低下して冷却能力が低下するおそれがある。これに対して、冷却媒体の流量を増大して冷却能力を確保することも考えられるが、冷却媒体の流量の増大には限界があり、容易ではない。 However, if the direction in which the cooling medium flows in the cooling chamber becomes non-uniform, the heat exchange efficiency of the cooling medium may decrease and the cooling capacity may decrease. On the other hand, it is conceivable to secure the cooling capacity by increasing the flow rate of the cooling medium, but there is a limit to increasing the flow rate of the cooling medium and it is not easy.

本発明は、上記問題に鑑みてなされたものであり、噴射弁を保持する冷却ホルダによる噴射弁の冷却能力を向上可能な還元剤供給装置及び冷却ホルダを提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a reducing agent supply device and a cooling holder capable of improving the cooling performance of the injection valve by the cooling holder holding the injection valve.

上記課題を解決するために、本発明のある観点によれば、排気管に取り付けられる噴射弁を備え、内燃機関の排気中に還元剤を供給する還元剤供給装置であって、噴射弁は、内燃機関の冷却水が通過する冷却ホルダに保持され、冷却ホルダは、噴射弁が配置される噴射弁保持部と、噴射弁保持部の周囲を囲むようにして設けられた環状の冷却室と、冷却室の外周面に開口して冷却水を導入する冷却媒体導入口と、冷却室の外周面に開口して冷却水を導出する冷却媒体導出口と、を備え、噴射弁の噴射孔が、環状を有する冷却室の軸方向の一端側であって、鉛直方向の下方側に位置する一端側に配置され、冷却媒体導入口が、冷却媒体導出口よりも一端側に設けられ、冷却媒体導入口につながる冷却媒体導入管の中心線が噴射弁保持部と重ならないように、冷却媒体導入管が冷却媒体導入口に接続され、冷却媒体導入管が、軸方向の他端側であって、鉛直方向の上方側に位置する他端側から一端側に向けて延びて冷却媒体導入口に接続される還元剤供給装置が提供される。 In order to solve the above-described problems, according to one aspect of the present invention, there is provided a reducing agent supply device that includes an injection valve attached to an exhaust pipe and supplies a reducing agent into the exhaust gas of an internal combustion engine, the injection valve comprising: It is held in a cooling holder through which the cooling water of the internal combustion engine passes, and the cooling holder includes an injection valve holding portion in which the injection valve is arranged, an annular cooling chamber provided so as to surround the injection valve holding portion, and a cooling chamber. a cooling medium inlet opening to the outer peripheral surface of the cooling chamber to introduce cooling water ; and a cooling medium outlet opening to the outer peripheral surface of the cooling chamber to lead out the cooling water. The cooling medium inlet is disposed on one end side of the cooling chamber in the axial direction and located on the lower side in the vertical direction, and the cooling medium inlet is provided on the one end side of the cooling medium outlet. The cooling medium introduction pipe is connected to the cooling medium introduction port so that the center line of the connected cooling medium introduction pipe does not overlap the injection valve holding portion , and the cooling medium introduction pipe is positioned at the other end side in the axial direction and in the vertical direction. A reducing agent supply device is provided that extends from the other end located above the to the one end and is connected to the cooling medium inlet .

また、上記課題を解決するために、本発明の別の観点によれば、噴射弁を保持して内燃機関の排気管に固定される冷却ホルダであって、噴射弁が配置される噴射弁保持部と、噴射弁保持部の周囲を囲むように設けられた環状を有する冷却室と、冷却室の外周面に開口して内燃機関の冷却水を導入する冷却媒体導入口と、冷却室の外周面に開口して冷却水を導出する冷却媒体導出口と、を備え、噴射弁の噴射孔が、環状を有する冷却室の軸方向の一端側に配置され、冷却媒体導入口が、冷却媒体導出口よりも一端側に設けられ、冷却媒体導入口につながる冷却媒体導入管の中心線が噴射弁保持部と重ならないように、冷却媒体導入管が冷却媒体導入口に接続され、冷却媒体導入管が、軸方向の他端側から一端側に向けて延びて冷却媒体導入口に接続される冷却ホルダが提供される。 In order to solve the above-described problems, according to another aspect of the present invention, there is provided a cooling holder that holds an injection valve and is fixed to an exhaust pipe of an internal combustion engine, the cooling holder holding the injection valve in which the injection valve is arranged. a cooling chamber having an annular shape surrounding the periphery of the injection valve holding portion; a cooling medium inlet that opens to the outer peripheral surface of the cooling chamber and introduces cooling water for the internal combustion engine; a cooling medium outlet that opens to the surface and guides the cooling water , the injection hole of the injection valve is arranged on one end side in the axial direction of the cooling chamber having an annular shape, and the cooling medium inlet serves as the cooling medium guide. A cooling medium introduction pipe is connected to the cooling medium introduction port so that the center line of the cooling medium introduction pipe, which is provided on one end side of the outlet and connected to the cooling medium introduction port , does not overlap the injection valve holding portion , and the cooling medium introduction pipe is extended from the other axial end side toward the one axial end side and connected to the cooling medium inlet .

以上説明したように本発明によれば、噴射弁を保持する冷却ホルダによる噴射弁の冷却能力を向上可能な還元剤供給装置及び冷却ホルダを提供することができる。 As described above, according to the present invention, it is possible to provide a reducing agent supply device and a cooling holder capable of improving the cooling performance of the injection valve by the cooling holder holding the injection valve.

本発明の実施の形態に係る還元剤供給装置を適用した尿素ＳＣＲシステムの構成例を示す模式図である。1 is a schematic diagram showing a configuration example of a urea SCR system to which a reducing agent supply device according to an embodiment of the invention is applied; FIG. 同実施形態に係る冷却ホルダの外観を示す説明図である。It is an explanatory view showing the appearance of the cooling holder according to the same embodiment. 同実施形態に係る冷却ホルダの構成例を示す説明図である。It is an explanatory view showing an example of composition of a cooling holder concerning the embodiment. 同実施形態に係る冷却ホルダ内を通過する冷却媒体の流れを示す説明図である。FIG. 4 is an explanatory diagram showing the flow of a cooling medium passing through the cooling holder according to the same embodiment; 参考例に係る冷却ホルダを示す説明図である。FIG. 5 is an explanatory diagram showing a cooling holder according to a reference example; 参考例に係る冷却ホルダ内を通過する冷却媒体の流れを示す説明図である。FIG. 4 is an explanatory diagram showing the flow of a cooling medium passing through a cooling holder according to a reference example; 冷却ホルダの変形例を示す説明図である。It is explanatory drawing which shows the modification of a cooling holder. 冷却ホルダの変形例を示す説明図である。It is explanatory drawing which shows the modification of a cooling holder. 冷却ホルダの変形例を示す説明図である。It is explanatory drawing which shows the modification of a cooling holder.

以下に添付図面を参照しながら、本発明の好適な実施の形態について詳細に説明する。なお、本明細書及び図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する。 Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

＜１．還元剤供給装置の全体構成＞
まず、本実施形態に係る還元剤供給装置を適用可能な尿素ＳＣＲシステムの全体構成の一例について説明する。図１は、尿素ＳＣＲシステムの構成例を示す模式図である。 <1. Overall Configuration of Reducing Agent Supply Device>
First, an example of the overall configuration of a urea SCR system to which the reducing agent supply device according to the present embodiment can be applied will be described. FIG. 1 is a schematic diagram showing a configuration example of a urea SCR system.

尿素ＳＣＲシステムは、ディーゼルエンジン等に代表される内燃機関１の排気系に接続された排気管５の途中に配設された選択還元触媒７と、選択還元触媒７よりも上流側で排気管５内に尿素水溶液を噴射する還元剤供給装置１０とを備える。尿素ＳＣＲシステムは、例えば自動車等の車両に搭載され、尿素水溶液を用いて、内燃機関１から排出される排気中のＮＯXを還元することにより排気を浄化するシステムである。尿素水溶液としては、例えば凍結温度が最も低い、約３２．５％濃度の尿素水溶液が用いられる。この場合の凍結温度は、約－１１℃である。 The urea SCR system includes a selective reduction catalyst 7 disposed in the middle of an exhaust pipe 5 connected to an exhaust system of an internal combustion engine 1 such as a diesel engine, and an exhaust pipe 5 upstream of the selective reduction catalyst 7. and a reducing agent supply device 10 for injecting a urea aqueous solution therein. The urea SCR system is installed in a vehicle such as an automobile, for example, and uses a urea aqueous solution to reduce NOx in the exhaust emitted from the internal combustion engine 1 to purify the exhaust. As the urea aqueous solution, for example, an approximately 32.5% concentration urea aqueous solution having the lowest freezing temperature is used. The freezing temperature in this case is about -11°C.

選択還元触媒７は、内燃機関１の排気中に含まれるＮＯXを選択的に還元する機能を有する。例えば、選択還元触媒７は、還元剤供給装置１０により供給される尿素水溶液が分解して生成されるアンモニアを吸着する。そして、選択還元触媒７に流入する排気中のＮＯXは、アンモニアと還元反応することによって分解される。かかる選択還元触媒７は、温度が活性温度を超える状態でＮＯXの還元効率が上昇し、温度が高いほどアンモニアの吸着可能量が減少する特性を有する。また、選択還元触媒７は、吸着可能量に対する実際のアンモニアの吸着率が高いほど、ＮＯXの還元効率が高くなる特性を有する。 The selective reduction catalyst 7 has a function of selectively reducing NO X contained in the exhaust gas of the internal combustion engine 1 . For example, the selective reduction catalyst 7 adsorbs ammonia generated by decomposition of the urea aqueous solution supplied by the reducing agent supply device 10 . NO X in the exhaust gas flowing into the selective reduction catalyst 7 is decomposed through a reduction reaction with ammonia. The selective reduction catalyst 7 has a characteristic that the NO x reduction efficiency increases when the temperature exceeds the activation temperature, and the amount of ammonia that can be adsorbed decreases as the temperature increases. In addition, the selective reduction catalyst 7 has a characteristic that the higher the actual ammonia adsorption rate with respect to the adsorbable amount, the higher the NO x reduction efficiency.

還元剤供給装置１０は、選択還元触媒７よりも上流側の排気管５内に尿素水溶液を供給する。尿素水溶液の供給量は、排気中に含まれるＮＯXの濃度及び選択還元触媒７におけるアンモニアの吸着可能量等に基づいて、選択還元触媒７の下流側に、ＮＯXあるいはアンモニアが流出しないように制御装置１００によって制御される。 The reducing agent supply device 10 supplies the aqueous urea solution into the exhaust pipe 5 on the upstream side of the selective reduction catalyst 7 . The amount of urea aqueous solution supplied is determined based on the concentration of NOx contained in the exhaust gas, the amount of ammonia that can be adsorbed by the selective reduction catalyst 7, etc. so that NOx or ammonia does not flow out downstream of the selective reduction catalyst 7. It is controlled by the control device 100 .

この他、排気管５には、図示しない温度センサ、ＮＯXセンサ及びアンモニアセンサ等の各種センサが設けられていてもよい。これらのセンサは、それぞれ、排気の温度、ＮＯX濃度、アンモニア濃度等の検出に用いられる。また、温度センサによって検出される排気温度は、選択還元触媒７の温度推定に用いられてもよい。 In addition, the exhaust pipe 5 may be provided with various sensors (not shown) such as a temperature sensor, a NOx sensor, and an ammonia sensor. These sensors are used to detect the exhaust temperature, NO x concentration, ammonia concentration, etc., respectively. Also, the exhaust temperature detected by the temperature sensor may be used to estimate the temperature of the selective reduction catalyst 7 .

＜２．還元剤供給装置＞
次に、本実施形態に係る還元剤供給装置１０の構成例について詳細に説明する。
還元剤供給装置１０は、尿素水溶液を貯蔵する貯蔵タンク１１と、尿素水溶液を圧送するポンプ２１を含むポンプモジュール２０と、選択還元触媒７よりも上流側の排気管５に固定された噴射弁２５を含む噴射モジュール４０とを備える。ポンプ２１及び噴射弁２５は、マイクロコンピュータ等を備えて構成される制御装置１００によって駆動制御される。 <2. Reducing Agent Supply Device>
Next, a configuration example of the reducing agent supply device 10 according to this embodiment will be described in detail.
The reducing agent supply device 10 includes a storage tank 11 that stores an aqueous urea solution, a pump module 20 that includes a pump 21 that pressure-feeds the aqueous urea solution, and an injection valve 25 fixed to the exhaust pipe 5 on the upstream side of the selective reduction catalyst 7 . and an injection module 40 including. The pump 21 and the injection valve 25 are driven and controlled by a control device 100 including a microcomputer or the like.

貯蔵タンク１１には、尿素水溶液の温度を検出する温度センサ１５が設けられる。ポンプモジュール２０は、ポンプ２１及び流路切換弁２３を備える。ポンプ２１は、第１の供給通路３１を介して、尿素水溶液を貯留する貯蔵タンク１１と接続される。また、ポンプ２１は、第２の供給通路３３を介して噴射弁２５と接続される。第２の供給通路３３には、他端が貯蔵タンク１１に接続されたリターン通路３５が接続されている。リターン通路３５には、図示しないオリフィス（絞り通路）あるいは逆止弁の少なくとも一方が備えられてもよい。オリフィスあるいは逆止弁は、第２の供給通路３３内の圧力を保持する機能を有する。 The storage tank 11 is provided with a temperature sensor 15 that detects the temperature of the urea aqueous solution. The pump module 20 has a pump 21 and a channel switching valve 23 . The pump 21 is connected via a first supply passage 31 to the storage tank 11 that stores the urea aqueous solution. Also, the pump 21 is connected to the injection valve 25 via the second supply passage 33 . A return passage 35 having the other end connected to the storage tank 11 is connected to the second supply passage 33 . The return passage 35 may be provided with at least one of an orifice (throttle passage) and a check valve (not shown). The orifice or check valve has the function of maintaining pressure in the second supply passage 33 .

ポンプ２１としては、例えば電動式のダイヤフラムポンプやモータポンプが用いられる。制御装置１００は、第２の供給通路３３内の圧力、すなわち、噴射弁２５に供給される尿素水溶液の圧力が所定の目標値で維持されるように、ポンプ２１の出力を制御する。例えば、制御装置１００は、第２の供給通路３３に設けられた圧力センサにより検出される圧力と目標値との差分に基づいて、ポンプ２１の出力をフィードバック制御する。 As the pump 21, for example, an electric diaphragm pump or motor pump is used. The control device 100 controls the output of the pump 21 so that the pressure inside the second supply passage 33, that is, the pressure of the urea aqueous solution supplied to the injection valve 25, is maintained at a predetermined target value. For example, the control device 100 feedback-controls the output of the pump 21 based on the difference between the pressure detected by the pressure sensor provided in the second supply passage 33 and the target value.

流路切換弁２３は、ポンプ２１によって圧送される尿素水溶液の流れる方向を切り換える。流路切換弁２３は、例えば電磁弁を用いて構成され、制御装置１００によって駆動される。本実施形態では、流路切換弁２３は、ポンプ２１の吸入側と第１の供給通路３１、及び、ポンプ２１の吐出側と第２の供給通路３３をそれぞれ接続する第１の状態と、ポンプ２１の吐出側と第１の供給通路３１、及び、ポンプ２１の吸入側と第２の供給通路３３をそれぞれ接続する第２の状態とを切り換える。 The channel switching valve 23 switches the direction of flow of the urea aqueous solution pressure-fed by the pump 21 . The channel switching valve 23 is configured using, for example, an electromagnetic valve and driven by the control device 100 . In this embodiment, the flow path switching valve 23 connects the suction side of the pump 21 to the first supply passage 31, and the discharge side of the pump 21 to the second supply passage 33, respectively. 21 and the first supply passage 31, and between the suction side of the pump 21 and the second supply passage 33, respectively.

排気管５内への尿素水溶液の噴射制御を行う場合には、尿素水溶液が貯蔵タンク１１側から噴射弁２５側へ流れるように、流路切換弁２３が第１の状態に保持される。また、還元剤供給装置１０内の尿素水溶液を貯蔵タンク１１に回収する場合には、尿素水溶液が噴射弁２５側から貯蔵タンク１１側へ流れるように、流路切換弁２３が第２の状態に保持される。 When controlling the injection of the urea aqueous solution into the exhaust pipe 5, the flow path switching valve 23 is held in the first state so that the urea aqueous solution flows from the storage tank 11 side to the injection valve 25 side. When the urea aqueous solution in the reducing agent supply device 10 is recovered to the storage tank 11, the flow path switching valve 23 is set to the second state so that the urea aqueous solution flows from the injection valve 25 side to the storage tank 11 side. retained.

例えば、流路切換弁２３が、通電状態において第１の状態となり、非通電状態において第２の状態となる場合、尿素水溶液の噴射制御時には流路切換弁２３は非通電状態で維持され、尿素水溶液の回収時に制御装置１００は流路切換弁２３を通電状態とする。なお、流路切換弁２３を用いる代わりに、逆回転可能なポンプを用いることによって、尿素水溶液が回収可能になっていてもよい。 For example, when the flow path switching valve 23 is in the first state in the energized state and in the second state in the non-energized state, the flow path switching valve 23 is maintained in the non-energized state during the injection control of the urea aqueous solution. When the aqueous solution is recovered, the control device 100 energizes the flow path switching valve 23 . Instead of using the flow path switching valve 23, a pump that can rotate in reverse may be used so that the aqueous urea solution can be recovered.

噴射モジュール４０は、噴射弁２５及び冷却ホルダ４１を備える。噴射弁２５は、冷却ホルダ４１に保持される。噴射弁２５としては、例えば、通電制御により開弁又は閉弁が切り換えられる電磁式開閉弁が用いられる。かかる噴射弁２５は、コイルを備え、当該コイルへの通電により発生する磁力によって弁体が移動して開弁する構造を有している。制御装置１００は、第２の供給通路３３内の圧力が所定の目標値となるようにポンプ２１の出力を制御しつつ、尿素水溶液の目標噴射量に応じて噴射弁２５の開弁時間を調節する。 The injection module 40 comprises an injection valve 25 and a cooling holder 41 . The injection valve 25 is held by a cooling holder 41 . As the injection valve 25, for example, an electromagnetic open/close valve that is switched between opening and closing by energization control is used. Such an injection valve 25 has a coil, and has a structure in which a valve body is moved by a magnetic force generated by energizing the coil to open the valve. The control device 100 controls the output of the pump 21 so that the pressure in the second supply passage 33 reaches a predetermined target value, and adjusts the valve opening time of the injection valve 25 according to the target injection amount of the aqueous urea solution. do.

冷却ホルダ４１は、冷却媒体として、内燃機関１の冷却水が流通可能に構成されている。内燃機関１の運転中、冷却水が冷却ホルダ４１内を通過して噴射弁２５の冷却が行われる一方、内燃機関１が停止すると冷却水の流通が停止する。なお、噴射弁２５を冷却する冷却媒体は、内燃機関１の冷却水に限られない。 The cooling holder 41 is configured so that cooling water for the internal combustion engine 1 can flow as a cooling medium. While the cooling water passes through the cooling holder 41 during operation of the internal combustion engine 1 to cool the injection valve 25, the circulation of the cooling water stops when the internal combustion engine 1 stops. Note that the cooling medium for cooling the injection valve 25 is not limited to the cooling water for the internal combustion engine 1 .

なお、噴射モジュール４０は、図１に示したように、排気が流れる排気管５の本流部分に取り付けられてもよいし、排気管５の本流部分から分岐した分岐部分に取り付けられてもよい。この場合、尿素水溶液は、分岐管を通じて排気管５の本流部分に供給される。本明細書において、本流部分及び分岐分を排気管と総称する。 The injection module 40 may be attached to the main stream portion of the exhaust pipe 5 through which exhaust gas flows, as shown in FIG. In this case, the urea aqueous solution is supplied to the main stream portion of the exhaust pipe 5 through the branch pipe. In this specification, the main stream portion and the branch portion are collectively referred to as an exhaust pipe.

還元剤供給装置１０には、内燃機関１の冷却水が循環する冷却水循環通路５０が配設されている。内燃機関１は、エンジンブロック内に形成され、ラジエータ３を通過するようにして冷却水を循環させる冷却水回路４を備える。冷却水回路４は、冷却水を循環させるポンプ２を備える。冷却水循環通路５０は、ポンプ２の下流側の冷却水回路４に設けられた分岐部５５において冷却水回路４から分岐し、ポンプ２の上流側の冷却水回路４に設けられた合流部５７で冷却水回路４に合流する。 A cooling water circulation passage 50 through which the cooling water of the internal combustion engine 1 circulates is arranged in the reducing agent supply device 10 . The internal combustion engine 1 includes a cooling water circuit 4 that is formed in an engine block and that circulates cooling water through a radiator 3 . The cooling water circuit 4 includes a pump 2 that circulates cooling water. The cooling water circulation passage 50 branches off from the cooling water circuit 4 at a branching portion 55 provided in the cooling water circuit 4 on the downstream side of the pump 2 , and joins at a joining portion 57 provided in the cooling water circuit 4 on the upstream side of the pump 2 . Joins the cooling water circuit 4 .

冷却水循環通路５０は、第１の部分５０ａと、第１の部分５０ａが分岐した第２の部分５０ｂ及び第３の部分５０ｃと、第２の部分５０ｂ及び第３の部分５０ｃが合流した第４の部分５０ｄとを含む。第３の部分５０ｃの途中には、噴射弁２５を保持する冷却ホルダ４１が接続される。第３の部分５０ｃを通過する冷却水は、主として噴射弁２５を冷却する機能を有する。 The cooling water circulation passage 50 includes a first portion 50a, a second portion 50b and a third portion 50c branching off from the first portion 50a, and a fourth portion 50b and a third portion 50c joining together. portion 50d. A cooling holder 41 that holds the injection valve 25 is connected to the middle of the third portion 50c. The cooling water passing through the third portion 50 c has a function of mainly cooling the injection valve 25 .

第２の部分５０ｂは、貯蔵タンク１１及びポンプモジュール２０を通過する。第２の部分５０ｂは、貯蔵タンク１１内を通過するとともに、第１の供給通路３１、流路切換弁２３、ポンプ２１及び第２の供給通路３３に隣接して配設される。第２の部分５０ｂを通過する冷却水は、主として還元剤供給装置１０を加熱し、尿素水溶液を解凍する機能を有する。 A second portion 50 b passes through the storage tank 11 and the pump module 20 . The second portion 50 b passes through the storage tank 11 and is arranged adjacent to the first supply passage 31 , flow path switching valve 23 , pump 21 and second supply passage 33 . The cooling water passing through the second portion 50b mainly has the function of heating the reducing agent supply device 10 and defrosting the aqueous urea solution.

第２の部分５０ｂの途中には開閉制御弁６１が備えられる。開閉制御弁６１は、例えば電磁開閉弁であり、制御装置１００により駆動制御されて第２の部分５０ｂを開閉する。例えば、内燃機関１の始動後、制御装置１００は、還元剤供給装置１０内で尿素水溶液が凍結するおそれがある場合に開閉制御弁６１を開弁状態に保持する。これにより、内燃機関１の冷却水回路４を循環する冷却水の一部が冷却水循環通路５０を流れ、還元剤供給装置１０が加熱される。一方、制御装置１００は、還元剤供給装置１０内で尿素水溶液が凍結するおそれが無い場合には開閉制御弁６１を閉弁状態に保持する。 An on-off control valve 61 is provided in the middle of the second portion 50b. The opening/closing control valve 61 is, for example, an electromagnetic opening/closing valve, and is driven and controlled by the control device 100 to open and close the second portion 50b. For example, after the internal combustion engine 1 is started, the control device 100 keeps the open/close control valve 61 open when the urea aqueous solution may freeze in the reducing agent supply device 10 . As a result, part of the cooling water circulating in the cooling water circuit 4 of the internal combustion engine 1 flows through the cooling water circulation passage 50, and the reducing agent supply device 10 is heated. On the other hand, the control device 100 keeps the open/close control valve 61 closed when there is no possibility that the urea aqueous solution will freeze in the reducing agent supply device 10 .

なお、冷却水循環通路５０の第３の部分５０ｃには開閉制御弁が設けられていないため、内燃機関１のポンプ２が駆動している間、冷却水は常時第３の部分５０ｃを流れ、噴射弁２５を冷却する。 Since the third portion 50c of the cooling water circulation passage 50 is not provided with an open/close control valve, the cooling water always flows through the third portion 50c and is injected while the pump 2 of the internal combustion engine 1 is being driven. Cool the valve 25 .

制御装置１００は、ポンプ２１、流路切換弁２３、噴射弁２５及び開閉制御弁６１をそれぞれ駆動する複数の駆動回路を備える。それぞれの駆動回路は、マイクロコンピュータ等から送信される信号に基づいて動作して、ポンプ２１、流路切換弁２３、噴射弁２５及び開閉制御弁６１を駆動する。 The control device 100 includes a plurality of drive circuits that drive the pump 21, the flow path switching valve 23, the injection valve 25, and the opening/closing control valve 61, respectively. Each drive circuit operates based on a signal transmitted from a microcomputer or the like to drive the pump 21 , flow path switching valve 23 , injection valve 25 and opening/closing control valve 61 .

制御装置１００の一部又は全部は、例えば、マイクロコンピュータ又はマイクロプロセッサユニット等で構成されていてもよい。また、制御装置１００の一部又は全部は、ファームウェア等の更新可能なもので構成されていてもよく、また、ＣＰＵ等からの指令によって実行されるプログラムモジュール等であってもよい。 A part or all of the control device 100 may be configured by, for example, a microcomputer or a microprocessor unit. Also, part or all of the control device 100 may be composed of an updatable device such as firmware, or may be a program module or the like that is executed by a command from a CPU or the like.

＜３．冷却ホルダ＞
次に、図２～図４を参照して、本実施形態に係る冷却ホルダ４１の構成例を説明する。図２は、冷却ホルダ４１の外観図であり、図３は、冷却ホルダ４１を軸方向に見た模式図であり、図４は、冷却ホルダ４１を模式的に示す斜視図である。なお、以下の説明において、噴射弁２５の噴射孔が位置する先端部２５ａが配置される方向を「下」といい、反対方向を「上」という。つまり、上下とは、図２の上下の方向に相当する。 <3. Cooling holder>
Next, configuration examples of the cooling holder 41 according to the present embodiment will be described with reference to FIGS. 2 to 4. FIG. 2 is an external view of the cooling holder 41, FIG. 3 is a schematic diagram of the cooling holder 41 viewed in the axial direction, and FIG. 4 is a perspective view schematically showing the cooling holder 41. As shown in FIG. In the following description, the direction in which the tip portion 25a of the injection valve 25 is positioned is called "down", and the opposite direction is called "up". That is, up and down correspond to the up and down direction in FIG.

冷却ホルダ４１は、例えば金属材料等の熱伝導率の高い材料を用いて略円柱状に形成されている。冷却ホルダ４１は、例えば取り付けプレート４９（図２を参照）を用いて、噴射弁２５の先端部２５ａが排気管５内に臨むようにして排気管５に取り付けられる。取り付けプレート４９と併せて、排気管５から噴射弁２５あるいは冷却ホルダ４１への熱伝達量を低減するガスケット等が用いられてもよい。 The cooling holder 41 is formed in a substantially columnar shape using a material with high thermal conductivity such as a metal material. The cooling holder 41 is attached to the exhaust pipe 5 using, for example, a mounting plate 49 (see FIG. 2) so that the tip portion 25a of the injection valve 25 faces the inside of the exhaust pipe 5 . A gasket or the like that reduces the amount of heat transfer from the exhaust pipe 5 to the injection valve 25 or the cooling holder 41 may be used in conjunction with the mounting plate 49 .

冷却ホルダ４１は、噴射弁保持部４２、冷却室４７、冷却媒体導入口４３ａ及び冷却媒体導出口４５ａを備える。噴射弁保持部４２は、冷却ホルダ４１の上下方向に延びる空間であって、少なくとも冷却ホルダ４１の上面に開口する。噴射弁保持部４２には、上面の開口から噴射弁２５が挿入される。噴射弁保持部４２は、例えば円柱状であり、噴射弁２５は、螺合される等によって噴射弁保持部４２に固定される。噴射弁２５の先端部２５ａは、下方側に開放される。 The cooling holder 41 includes an injection valve holding portion 42, a cooling chamber 47, a cooling medium inlet 43a, and a cooling medium outlet 45a. The injection valve holding portion 42 is a space extending in the vertical direction of the cooling holder 41 and opens at least to the upper surface of the cooling holder 41 . The injection valve 25 is inserted into the injection valve holding portion 42 through an opening on the upper surface. The injection valve holding portion 42 has, for example, a cylindrical shape, and the injection valve 25 is fixed to the injection valve holding portion 42 by screwing or the like. A tip portion 25a of the injection valve 25 is opened downward.

冷却室４７は、噴射弁保持部４２の周囲を囲むように形成され、冷却ホルダ４１の外部に対して閉じられた環状空間である。本実施形態に係る冷却ホルダ４１の例では、噴射弁保持部４２が、冷却室４７の中心軸に対して偏心した位置に設けられている。冷却室４７は、噴射弁保持部４２に対しても遮断され、噴射弁保持部４２内に冷却水が侵入しないようになっている。 The cooling chamber 47 is an annular space formed to surround the injection valve holding portion 42 and closed to the outside of the cooling holder 41 . In the example of the cooling holder 41 according to this embodiment, the injection valve holding portion 42 is provided at a position eccentric with respect to the central axis of the cooling chamber 47 . The cooling chamber 47 is also shut off from the injection valve holding portion 42 so that cooling water does not enter the injection valve holding portion 42 .

冷却媒体導入口４３ａ及び冷却媒体導出口４５ａは、ともに冷却室４７の外周面に連通するように設けられている。冷却媒体導入口４３ａと冷却媒体導出口４５ａとは、冷却室４７の軸方向に異なる位置に設けられている。本実施形態において、冷却媒体導入口４３ａは、冷却媒体導出口４５ａよりも下方側に設けられている。 Both the cooling medium inlet 43 a and the cooling medium outlet 45 a are provided so as to communicate with the outer peripheral surface of the cooling chamber 47 . The cooling medium inlet 43 a and the cooling medium outlet 45 a are provided at different positions in the axial direction of the cooling chamber 47 . In this embodiment, the cooling medium inlet 43a is provided below the cooling medium outlet 45a.

冷却ホルダ４１の外周面には、冷却媒体導入口４３ａに連通するように冷却媒体導入管４３が接続されている。また、冷却ホルダ４１の外周面には、冷却媒体導出口４５ａに連通するように冷却媒体導出管４５が接続されている。図２に示した冷却媒体導入管４３及び冷却媒体導出管４５は、途中で屈曲した略Ｌ字状を有しているが、冷却媒体導入管４３及び冷却媒体導出管４５の形状はこれに限られない。 A cooling medium introduction pipe 43 is connected to the outer peripheral surface of the cooling holder 41 so as to communicate with the cooling medium introduction port 43a. A cooling medium outlet pipe 45 is connected to the outer peripheral surface of the cooling holder 41 so as to communicate with the cooling medium outlet port 45a. The cooling medium inlet pipe 43 and the cooling medium outlet pipe 45 shown in FIG. 2 have a substantially L-shape that is bent in the middle. can't

冷却媒体導入管４３は、冷却媒体導入口４３ａにつながる冷却媒体導入管４３の中心線Ｃ１が噴射弁保持部４２と重ならないように、冷却ホルダ４１に接続されている。また、冷却媒体導出管４５は、冷却媒体導出口４５ａにつながる冷却媒体導出管４５の中心線Ｃ２が噴射弁保持部４２と重ならないように、冷却ホルダ４１に接続されている。図３に示した例では、冷却ホルダ４１を軸方向に見たときに、冷却媒体導入管４３の中心線Ｃ１及び冷却媒体導出管４５の中心線Ｃ２が、ともに冷却室４７の中心軸Ｐから同一方向にずらされている。 The cooling medium introduction pipe 43 is connected to the cooling holder 41 so that the center line C1 of the cooling medium introduction pipe 43 leading to the cooling medium introduction port 43 a does not overlap the injection valve holding portion 42 . Further, the cooling medium outlet pipe 45 is connected to the cooling holder 41 so that the center line C2 of the cooling medium outlet pipe 45 leading to the cooling medium outlet port 45a does not overlap with the injection valve holding portion . In the example shown in FIG. 3, when the cooling holder 41 is viewed in the axial direction, both the center line C1 of the cooling medium introduction pipe 43 and the center line C2 of the cooling medium outlet pipe 45 are aligned from the central axis P of the cooling chamber 47. shifted in the same direction.

図５及び図６は、参考例に係る冷却ホルダ１４１の構成例を示す模式図である。図５及び図６は、それぞれ本実施形態に係る冷却ホルダ４１の構成例を示す図３及び図４に相当する。 5 and 6 are schematic diagrams showing configuration examples of the cooling holder 141 according to the reference example. 5 and 6 correspond to FIGS. 3 and 4, respectively, showing configuration examples of the cooling holder 41 according to the present embodiment.

参考例に係る冷却ホルダ１４１では、冷却媒体導入管１４３は、冷却媒体導入口１４３ａにつながる冷却媒体導入管１４３の中心線Ｃ１が噴射弁保持部４２と重なるようにして、冷却ホルダ１４１に接続されている。また、冷却媒体導出管１４５は、冷却媒体導出口１４５ａにつながる冷却媒体導出管１４５の中心線Ｃ２が噴射弁保持部４２と重なるようにして、冷却ホルダ１４１に接続されている。図５に示した例では、冷却ホルダ１４１を軸方向に見たときに、冷却媒体導入管１４３の中心線Ｃ１及び冷却媒体導出管１４５の中心線Ｃ２が、ともに冷却室４７の中心軸Ｐの方向に延びて、噴射弁保持部４２と重なっている。 In the cooling holder 141 according to the reference example, the cooling medium introduction pipe 143 is connected to the cooling holder 141 such that the center line C1 of the cooling medium introduction pipe 143 connected to the cooling medium introduction port 143a overlaps the injection valve holding portion 42. ing. Further, the cooling medium outlet pipe 145 is connected to the cooling holder 141 so that the center line C2 of the cooling medium outlet pipe 145 leading to the cooling medium outlet port 145a overlaps with the injection valve holding portion . In the example shown in FIG. 5, when the cooling holder 141 is viewed in the axial direction, both the center line C1 of the cooling medium introduction pipe 143 and the center line C2 of the cooling medium outlet pipe 145 are aligned with the central axis P of the cooling chamber 47. It extends in the direction and overlaps with the injection valve holding portion 42 .

したがって、冷却媒体導入口１４３ａを介して冷却室４７に導入される冷却水は、噴射弁保持部４２に当たって左右に分かれながら流れ、冷却室４７内での冷却水の流れが不均一になりやすい。このため、冷却室４７内に、冷却水の流速が速い領域と遅い領域とが形成され、噴射弁２５の冷却効率が低下しやすくなっている。 Therefore, the cooling water introduced into the cooling chamber 47 through the cooling medium inlet 143a hits the injection valve holding portion 42 and flows while splitting left and right, and the flow of the cooling water within the cooling chamber 47 tends to be uneven. For this reason, a region in which the flow speed of the cooling water is high and a region in which the flow speed of the cooling water is low are formed in the cooling chamber 47, and the cooling efficiency of the injection valve 25 is likely to decrease.

これに対して、本実施形態に係る冷却ホルダ４１の場合、冷却媒体導入口４３ａを介して冷却室４７に導入される冷却水は、噴射弁保持部４２の周囲を同方向に旋回しながら流れる。また、冷却水は、冷却室４７内を旋回しながら流れた後、冷却媒体導出口４５ａを介して、冷却水の流れの方向に沿って接続された冷却媒体導出管４５へと導出される。これにより、冷却水が、噴射弁２５が有する熱を効率的に奪うことができ、噴射弁２５の冷却能力を向上させることができる。 In contrast, in the case of the cooling holder 41 according to the present embodiment, the cooling water introduced into the cooling chamber 47 through the cooling medium inlet 43a flows around the injection valve holding portion 42 while turning in the same direction. . Further, the cooling water flows while swirling in the cooling chamber 47, and is then led out to the cooling medium outlet pipe 45 connected along the direction of the flow of the cooling water via the cooling medium outlet port 45a. As a result, the cooling water can efficiently remove the heat from the injection valve 25, and the cooling performance of the injection valve 25 can be improved.

特に、冷却媒体導入口４３ａが、冷却媒体導出口４５ａよりも下方側に設けられているため、噴射弁２５の先端部２５ａが下方側に位置するようにして噴射モジュール４０が排気管５に取り付けられた場合には、導入される比較的低温の冷却水が、排気熱の影響を受けやすい噴射弁２５の先端部２５ａの周囲に効率的に供給される。また、冷却水は、噴射弁２５の先端部２５ａの熱を奪うことによって温度上昇し、旋回しながら上方に向かって流れて、冷却媒体導出口４５ａから導出される。これにより、噴射弁２５の先端部２５ａの周囲には、常に比較的低温の冷却水が継続的に供給され、噴射弁２５の冷却効率が高められる。さらに、冷却水が、噴射弁保持部４２の周囲を旋回しながら流れることから、冷却室４７内のあらゆる領域に冷却水が均一に流れやすくなり、噴射弁２５の冷却効率が高められる。 In particular, since the coolant inlet port 43a is provided below the coolant outlet port 45a, the injection module 40 is attached to the exhaust pipe 5 so that the tip portion 25a of the injection valve 25 is positioned downward. In this case, the introduced relatively low-temperature cooling water is efficiently supplied around the tip portion 25a of the injection valve 25, which is easily affected by exhaust heat. Also, the cooling water increases in temperature by absorbing heat from the tip portion 25a of the injection valve 25, flows upward while swirling, and is discharged from the cooling medium outlet port 45a. As a result, relatively low-temperature cooling water is continuously supplied to the periphery of the tip portion 25a of the injection valve 25, and the cooling efficiency of the injection valve 25 is enhanced. Furthermore, since the cooling water flows while swirling around the injection valve holding portion 42, the cooling water tends to flow uniformly in all regions in the cooling chamber 47, and the cooling efficiency of the injection valve 25 is enhanced.

したがって、冷却水の流量が比較的少ない場合であっても、時間をかけて噴射弁２５から熱を奪うことができ、効率的に噴射弁２５を冷却することができる。このため、内燃機関１の停止時の噴射弁２５の温度が比較的低温に保たれるため、内燃機関１の運転が停止し、冷却水の循環が停止した場合であっても、その後の噴射弁２５の温度上昇に伴う温度の到達点を低くすることができる。その結果、噴射弁２５の熱損傷や、尿素水溶液の濃度の上昇に伴う尿素水溶液の結晶化による噴射孔の詰まりが抑制される。また、噴射弁２５の冷却効率が向上することによって、冷却水を循環させるポンプ２の負荷を低減することができるとともに、ポンプ２の圧送機能が低下した場合であっても、噴射弁２５の冷却機能を一定以上に保持することができ、還元剤の噴射を継続することができる。 Therefore, even if the flow rate of cooling water is relatively small, heat can be removed from the injection valve 25 over time, and the injection valve 25 can be efficiently cooled. Therefore, the temperature of the injection valve 25 is kept relatively low when the internal combustion engine 1 is stopped. It is possible to lower the reaching point of the temperature accompanying the temperature rise of the valve 25 . As a result, thermal damage to the injection valve 25 and clogging of injection holes due to crystallization of the aqueous urea solution due to an increase in concentration of the aqueous urea solution are suppressed. Further, by improving the cooling efficiency of the injection valve 25, it is possible to reduce the load on the pump 2 that circulates the cooling water. The function can be maintained above a certain level, and the injection of the reducing agent can be continued.

また、噴射弁２５の先端部２５ａが、冷却室４７の中心軸Ｐの一端側（下方側）に配置されている場合、冷却水が、冷却室４７の中心軸Ｐの他端側（上方側）から一端側（下方側）に向けて導入されるように冷却媒体導入管４３が接続されていてもよい。例えば、図７に示すように、冷却媒体導入口４３ａにつながる冷却媒体導入管４３が、上方側から下方側に向けて延びて冷却媒体導入口４３ａに接続されていてもよい。 Further, when the tip portion 25 a of the injection valve 25 is arranged on one end side (lower side) of the central axis P of the cooling chamber 47 , the cooling water is arranged on the other end side (upper side) of the central axis P of the cooling chamber 47 . ) toward one end side (downward side). For example, as shown in FIG. 7, a cooling medium introduction pipe 43 connected to a cooling medium introduction port 43a may extend downward from the upper side and be connected to the cooling medium introduction port 43a.

これにより、冷却室４７に新たに導入される比較的低温の冷却水が、排気熱の影響を受けやすい噴射弁２５の先端部２５ａに対して効率的に供給される。したがって、噴射弁２５の冷却効率をより向上させることができる。 As a result, the relatively low-temperature cooling water newly introduced into the cooling chamber 47 is efficiently supplied to the tip end portion 25a of the injection valve 25, which is easily affected by exhaust heat. Therefore, the cooling efficiency of the injection valve 25 can be further improved.

また、冷却媒体導入管４３の中心線Ｃ１及び冷却媒体導出管４５の中心線Ｃ２が噴射弁保持部４２と重ならないようにする構成は、上記の実施形態の例に限られない。図８に示すように、冷却室４７を軸方向に見たときに、冷却媒体導入管４３と冷却媒体導出管４５とが略直線上に配置されてもよい。あるいは、図９に示すように、冷却室４７を軸方向に見たときに、冷却媒体導入管４３及び冷却媒体導出管４５が、同一の方向から冷却ホルダ４１Ｂに接続され、冷却媒体導入管４３の中心線Ｃ１と冷却媒体導出管４５の中心線Ｃ２とが、冷却室４７の中心軸Ｐから互いに反対の方向にずらされてもよい。図示しないものの、図８及び図９に示す変形例は、いずれも冷却媒体導入口４３ａ及び冷却媒体導出口４５ａが冷却室４７の中心軸Ｐが延びる方向に異なる位置に設けられている。 Further, the configuration for preventing the center line C1 of the cooling medium introduction pipe 43 and the center line C2 of the cooling medium outlet pipe 45 from overlapping with the injection valve holding portion 42 is not limited to the example of the above embodiment. As shown in FIG. 8, when the cooling chamber 47 is viewed in the axial direction, the cooling medium introduction pipe 43 and the cooling medium outlet pipe 45 may be arranged substantially on a straight line. Alternatively, as shown in FIG. 9, when the cooling chamber 47 is viewed in the axial direction, the cooling medium introduction pipe 43 and the cooling medium discharge pipe 45 are connected to the cooling holder 41B from the same direction, and the cooling medium introduction pipe 43 and the center line C2 of the cooling medium outlet pipe 45 may be offset from the central axis P of the cooling chamber 47 in opposite directions. Although not shown, in the modifications shown in FIGS. 8 and 9, the cooling medium inlet 43a and the cooling medium outlet 45a are provided at different positions in the direction in which the central axis P of the cooling chamber 47 extends.

図８及び図９に示した冷却ホルダ４１Ａ，４１Ｂの構成であっても、冷却媒体導入口４３ａを介して冷却室４７に導入される冷却水は、噴射弁保持部４２の周囲を同方向に旋回しながら流れる。また、冷却水は、冷却室４７内を旋回しながら流れた後、冷却媒体導出口４５ａを介して、冷却水の流れの方向に沿って接続された冷却媒体導出管４５へと導出される。これにより、冷却水が、噴射弁２５が有する熱を効率的に奪うことができ、噴射弁２５の冷却能力を向上させることができる。 Even in the configuration of the cooling holders 41A and 41B shown in FIGS. 8 and 9, the cooling water introduced into the cooling chamber 47 through the cooling medium inlet 43a flows around the injection valve holding portion 42 in the same direction. Flow while spinning. Further, the cooling water flows while swirling in the cooling chamber 47, and is then led out to the cooling medium outlet pipe 45 connected along the direction of the flow of the cooling water via the cooling medium outlet port 45a. As a result, the cooling water can efficiently remove heat from the injection valve 25, and the cooling performance of the injection valve 25 can be improved.

また、冷却ホルダ４１Ａ，４１Ｂにおいても、冷却媒体導入口４３ａが、冷却媒体導出口４５ａよりも下方側に設けられているため、上記実施形態に係る冷却ホルダ４１と同様の効果を得ることができる。さらに、冷却ホルダ４１Ａ，４１Ｂにおいても、冷却媒体導入口４３ａにつながる冷却媒体導入管４３が、上方側から下方側に向けて延びて冷却媒体導入口４３ａに接続されていてもよい。これにより、噴射弁２５の冷却効率をより向上させることができる。 Also, in the cooling holders 41A and 41B, since the cooling medium inlet 43a is provided below the cooling medium outlet 45a, the same effect as the cooling holder 41 according to the above embodiment can be obtained. . Furthermore, in the cooling holders 41A and 41B, the cooling medium introduction pipe 43 connected to the cooling medium introduction port 43a may extend downward from the upper side and be connected to the cooling medium introduction port 43a. Thereby, the cooling efficiency of the injection valve 25 can be further improved.

以上、添付図面を参照しながら本発明の好適な実施形態について詳細に説明したが、本発明はかかる例に限定されない。本発明の属する技術の分野における通常の知識を有する者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、これらについても、当然に本発明の技術的範囲に属するものと了解される。 Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention belongs can conceive of various modifications or modifications within the scope of the technical idea described in the claims. It is understood that these also naturally belong to the technical scope of the present invention.

例えば、上記実施形態では、冷却ホルダ４１が円柱状の外形を有していたが、本発明はかかる例に限定されない。冷却水が導入される冷却室４７が、噴射弁保持部４２の周囲を囲むように環状に形成されていれば、冷却ホルダ４１の外形は矩形その他の形状であってもよい。 For example, in the above embodiment, the cooling holder 41 has a cylindrical outer shape, but the present invention is not limited to such an example. As long as the cooling chamber 47 into which cooling water is introduced is formed in an annular shape so as to surround the periphery of the injection valve holding portion 42, the external shape of the cooling holder 41 may be rectangular or other shape.

１・・・内燃機関、５・・・排気管、１０・・・還元剤供給装置、２０・・・ポンプモジュール、２１・・・ポンプ、２５・・・噴射弁、４０・・・噴射モジュール、４１・・・冷却ホルダ、４２・・・噴射弁保持部、４３・・・冷却媒体導入管、４３ａ・・・冷却媒体導入口、４５・・・冷却媒体導出管、４５ａ・・・冷却媒体導出口、４７・・・冷却室、５０・・・冷却水循環通路
Reference Signs List 1 Internal combustion engine 5 Exhaust pipe 10 Reducing agent supply device 20 Pump module 21 Pump 25 Injection valve 40 Injection module 41 Cooling holder 42 Injection valve holder 43 Cooling medium inlet pipe 43a Cooling medium inlet 45 Cooling medium outlet pipe 45a Cooling medium guide Outlet 47 Cooling chamber 50 Cooling water circulation passage

Claims (4)

排気管（５）に取り付けられる噴射弁（２５）を備え、内燃機関（１）の排気中に還元剤を供給する還元剤供給装置（１０）において、
前記噴射弁（２５）は、
前記内燃機関（１）の冷却水が通過する冷却ホルダ（４１）に保持され、
前記冷却ホルダ（４１）は、
前記噴射弁（２５）が配置される噴射弁保持部（４２）と、
前記噴射弁保持部（４２）の周囲を囲むようにして設けられた環状の冷却室（４７）と、
前記冷却室（４７）の外周面に開口して前記冷却水を導入する冷却媒体導入口（４３ａ）と、
前記冷却室（４７）の外周面に開口して前記冷却水を導出する冷却媒体導出口（４５ａ）と、を備え、
前記噴射弁（２５）の噴射孔が、環状を有する前記冷却室（４７）の軸方向の一端側であって、鉛直方向の下方側に位置する前記一端側に配置され、
前記冷却媒体導入口（４３ａ）が、前記冷却媒体導出口（４５ａ）よりも前記一端側に設けられ、
前記冷却媒体導入口（４３ａ）につながる冷却媒体導入管（４３）の中心線が前記噴射弁保持部（４２）と重ならないように、前記冷却媒体導入管（４３）が前記冷却媒体導入口（４３ａ）に接続され、
前記冷却媒体導入管（４３）が、前記軸方向の他端側であって、鉛直方向の上方側に位置する前記他端側から前記一端側に向けて延びて前記冷却媒体導入口（４３ａ）に接続される
ことを特徴とする、還元剤供給装置。 In a reducing agent supply device (10) comprising an injection valve (25) attached to an exhaust pipe (5) and supplying a reducing agent into the exhaust gas of an internal combustion engine (1),
The injection valve (25) is
held in a cooling holder (41) through which cooling water of the internal combustion engine (1) passes,
The cooling holder (41) is
an injection valve holding portion (42) in which the injection valve (25) is arranged;
an annular cooling chamber (47) provided so as to surround the injection valve holding portion (42);
a cooling medium introduction port (43a) that opens to the outer peripheral surface of the cooling chamber (47) and introduces the cooling water ;
a cooling medium outlet (45a) that opens in the outer peripheral surface of the cooling chamber (47) and leads out the cooling water ,
the injection hole of the injection valve (25) is arranged at one end in the axial direction of the cooling chamber (47) having an annular shape and located on the lower side in the vertical direction;
The cooling medium inlet (43a) is provided closer to the one end than the cooling medium outlet (45a),
The cooling medium introduction pipe (43) is connected to the cooling medium introduction port (43a) so that the center line of the cooling medium introduction pipe (43) connected to the cooling medium introduction port (43a) does not overlap the injection valve holding portion (42). 43a) ,
The cooling medium introduction pipe (43) extends toward the one end side from the other end side in the axial direction and located on the upper side in the vertical direction to form the cooling medium introduction port (43a). A reducing agent supply device, characterized in that it is connected to a 前記冷却媒体導出口（４５ａ）につながる冷却媒体導出管（４５）の中心線が前記噴射弁保持部（４２）と重ならないように、前記冷却媒体導出管（４５）が接続される
ことを特徴とする、請求項１に記載の還元剤供給装置。 The cooling medium outlet pipe (45) is connected so that the center line of the cooling medium outlet pipe (45) leading to the cooling medium outlet (45a) does not overlap with the injection valve holding portion (42). The reducing agent supply device according to claim 1, wherein 環状の前記冷却室（４７）を前記軸方向に見たときに、
前記冷却媒体導入管（４３）の中心線及び前記冷却媒体導出管（４５）の中心線が、ともに前記冷却室（４７）の中心軸から同一方向にずらされている
ことを特徴とする、請求項２に記載の還元剤供給装置。 When the annular cooling chamber (47) is viewed in the axial direction,
The centerline of the cooling medium introduction pipe (43) and the centerline of the cooling medium outlet pipe (45) are both shifted in the same direction from the central axis of the cooling chamber (47). Item 3. The reducing agent supply device according to item 2. 噴射弁（２５）を保持して内燃機関（１）の排気管（５）に固定される冷却ホルダ（４１）において、
前記噴射弁（２５）が配置される噴射弁保持部（４２）と、
前記噴射弁保持部（４２）の周囲を囲むように設けられた環状を有する冷却室（４７）と、
前記冷却室（４７）の外周面に開口して前記内燃機関（１）の冷却水を導入する冷却媒体導入口（４３ａ）と、
前記冷却室（４７）の外周面に開口して前記冷却水を導出する冷却媒体導出口（４５ａ）と、を備え、
前記噴射弁（２５）の噴射孔が、環状を有する前記冷却室（４７）の軸方向の一端側に配置され、
前記冷却媒体導入口（４３ａ）が、前記冷却媒体導出口（４５ａ）よりも前記一端側に設けられ、
前記冷却媒体導入口（４３ａ）につながる冷却媒体導入管（４３）の中心線が前記噴射弁保持部（４２）と重ならないように、前記冷却媒体導入管（４３）が前記冷却媒体導入口（４３ａ）に接続され、
前記冷却媒体導入管（４３）が、前記軸方向の他端側から前記一端側に向けて延びて前記冷却媒体導入口（４３ａ）に接続される
ことを特徴とする冷却ホルダ。In a cooling holder (41) fixed to the exhaust pipe (5) of the internal combustion engine (1) holding the injection valve (25),
an injection valve holding portion (42) in which the injection valve (25) is arranged;
a cooling chamber (47) having an annular shape surrounding the injection valve holding portion (42);
a cooling medium introduction port (43a) that opens to the outer peripheral surface of the cooling chamber (47) and introduces cooling water for the internal combustion engine (1);
a cooling medium outlet (45a) that opens in the outer peripheral surface of the cooling chamber (47) and leads out the cooling water,
the injection hole of the injection valve (25) is arranged at one axial end side of the cooling chamber (47) having an annular shape,
The cooling medium inlet (43a) is provided closer to the one end than the cooling medium outlet (45a),
The cooling medium introduction pipe (43) is connected to the cooling medium introduction port (43a) so that the center line of the cooling medium introduction pipe (43) connected to the cooling medium introduction port (43a) does not overlap the injection valve holding portion (42). 43a),
A cooling holder, wherein the cooling medium introduction pipe (43) extends from the other end side in the axial direction toward the one end side and is connected to the cooling medium introduction port (43a).
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004044483A (en) 2002-07-11 2004-02-12 Hino Motors Ltd Exhaust emission control device
JP2010019239A (en) 2008-07-14 2010-01-28 Mitsubishi Motors Corp Exhaust emission control device
US20140260207A1 (en) 2013-03-15 2014-09-18 Tenneco Automotive Operating Company Inc. Multi-Layer Liquid-Cooled Mount

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004044483A (en) 2002-07-11 2004-02-12 Hino Motors Ltd Exhaust emission control device
JP2010019239A (en) 2008-07-14 2010-01-28 Mitsubishi Motors Corp Exhaust emission control device
US20140260207A1 (en) 2013-03-15 2014-09-18 Tenneco Automotive Operating Company Inc. Multi-Layer Liquid-Cooled Mount

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