JP2003020936A - ARRANGEMENT STRUCTURE FOR LIQUID REDUCING AGENT TANK FOR NOx REDUCTION CATALYST - Google Patents

ARRANGEMENT STRUCTURE FOR LIQUID REDUCING AGENT TANK FOR NOx REDUCTION CATALYST

Info

Publication number
JP2003020936A
JP2003020936A JP2001201736A JP2001201736A JP2003020936A JP 2003020936 A JP2003020936 A JP 2003020936A JP 2001201736 A JP2001201736 A JP 2001201736A JP 2001201736 A JP2001201736 A JP 2001201736A JP 2003020936 A JP2003020936 A JP 2003020936A
Authority
JP
Japan
Prior art keywords
reducing agent
liquid reducing
agent tank
reduction catalyst
tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001201736A
Other languages
Japanese (ja)
Inventor
Masafumi Tsuji
雅文 辻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP2001201736A priority Critical patent/JP2003020936A/en
Publication of JP2003020936A publication Critical patent/JP2003020936A/en
Pending legal-status Critical Current

Links

Classifications

    • 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]
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
    • E02F9/0883—Tanks, e.g. oil tank, urea tank, fuel tank
    • 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
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To provide an arrangement structure for a liquid reducing agent tank for an NOx reduction catalyst for preventing freezing of the liquid reducing agent. SOLUTION: In a vehicle or a machine using an engine with an NOx reduction catalyst using the liquid reducing agent easy to freeze, a liquid reducing agent tank 25 is arranged at a heat insulating portion in the vehicle or the machine. For instance, the tank 25 is arranged at (1) or (2) inside an engine room 4 provided in an upper revolving body 1 in a hydraulic excavator, (3) in the vicinity of a hydraulic pump 22, (4) in the vicinity of a valve 21, (5) within a driver's cab 2, (b) in the vicinity of a hydraulic fluid tank 23 or (9) in the vicinity of a hydraulic motor 26.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、凍結し易い液体還
元剤を用いるＮＯｘ還元触媒付エンジンを用いた車両ま
たは機械の、液体還元剤タンクの配置構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement structure of a liquid reducing agent tank of a vehicle or a machine using an engine equipped with a NOx reduction catalyst that uses a liquid reducing agent that easily freezes.

【０００２】[0002]

【従来の技術】デイーゼルエンジンの排気ガス中のＮＯ
ｘを低減し、排気ガスを浄化するために還元触媒が用い
られる事が多い。この還元触媒が吸収したＮＯｘを還元
させるために還元触媒の上流に還元剤を供給し、還元反
応を促進する事が行われる。この還元剤としては窒素化
合物類、一酸化炭素等があるが、近年尿素を水に溶解し
た水溶液が有望視されている。しかしながら尿素水溶液
は−１０℃付近で凍結するため、寒冷時に支障をきたす
という問題点がある。この問題点を解決する手段とし
て、特開２０００−２７６２７号公報に開示されたもの
がある。2. Description of the Related Art NO in exhaust gas of diesel engine
A reduction catalyst is often used to reduce x and purify exhaust gas. In order to reduce the NOx absorbed by the reduction catalyst, a reducing agent is supplied upstream of the reduction catalyst to promote the reduction reaction. Nitrogen compounds, carbon monoxide, and the like are used as the reducing agent, and an aqueous solution in which urea is dissolved in water has been considered promising in recent years. However, since the urea aqueous solution freezes at around -10 ° C, there is a problem that it causes trouble during cold weather. As means for solving this problem, there is one disclosed in Japanese Patent Laid-Open No. 2000-27627.

【０００３】図７は特開２０００−２７６２７号公報に
開示された排気ガス浄化装置の概念図である。図７にお
いて、エンジン１０からの排気ガスは排気管３０に設け
られたＮＯｘ還元触媒３１を通って大気中に放出され
る。尿素水溶液は還元剤貯蔵タンク３２に貯留され、還
元剤貯蔵タンク３２は還元剤供給パイプ３３により排気
管３０に接続しており、尿素水溶液は還元剤供給ポンプ
３４により排気管３０に供給されるようになっている。
還元剤貯蔵タンク３２および還元剤供給パイプ３３は断
熱材層３５により被覆されている。還元剤貯蔵タンク３
２内にはヒータ３６ａが挿入設置されるとともに還元剤
温度センサ３７が設けられ、還元剤供給パイプ３３を被
覆する断熱材層３５にはヒータ３６ｂが設けられてい
る。コンピュータ３８は還元剤温度センサ３７からの検
出信号を入力し、必要に応じてヒータ３６ａ，３６ｂに
制御信号を出力して尿素水溶液を加熱し、凍結を防止す
るようになっている。FIG. 7 is a conceptual diagram of the exhaust gas purifying apparatus disclosed in Japanese Patent Laid-Open No. 2000-27627. In FIG. 7, exhaust gas from the engine 10 is released into the atmosphere through a NOx reduction catalyst 31 provided in the exhaust pipe 30. The urea aqueous solution is stored in the reducing agent storage tank 32, the reducing agent storage tank 32 is connected to the exhaust pipe 30 by the reducing agent supply pipe 33, and the urea aqueous solution is supplied to the exhaust pipe 30 by the reducing agent supply pump 34. It has become.
The reducing agent storage tank 32 and the reducing agent supply pipe 33 are covered with a heat insulating material layer 35. Reductant storage tank 3
A heater 36a is inserted and installed in the chamber 2, a reducing agent temperature sensor 37 is provided, and a heater 36b is provided in the heat insulating material layer 35 covering the reducing agent supply pipe 33. The computer 38 inputs the detection signal from the reducing agent temperature sensor 37 and outputs a control signal to the heaters 36a and 36b as necessary to heat the urea aqueous solution to prevent freezing.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、上記構
成においては構造複雑でコストも高く、寒冷時には常時
ヒータを入れておく必要があり、エネルギーを浪費する
という問題がある。However, the above structure has a problem that the structure is complicated and the cost is high, and it is necessary to always put a heater in cold weather, and energy is wasted.

【０００５】本発明は、上記の問題点に着目してなされ
たものであり、寒冷時の液体還元剤の凍結防止に効果が
あり、エンジン始動後早期に温度を上昇させることがで
き、構造簡単でコストが安く、エネルギーを浪費するこ
とのないＮＯｘ還元触媒用液体還元剤タンクの配置構造
を提供することを目的としている。The present invention has been made by paying attention to the above problems, has an effect of preventing freezing of the liquid reducing agent in cold weather, can raise the temperature early after starting the engine, and has a simple structure. It is an object of the present invention to provide an arrangement structure of a liquid reducing agent tank for a NOx reduction catalyst that is low in cost and does not waste energy.

【０００６】[0006]

【課題を解決するための手段、作用及び効果】上記の目
的を達成するために、第１発明は、凍結し易い液体還元
剤を用いるＮＯｘ還元触媒付ジンエンを用いた車両また
は機械において、前記液体還元剤を貯留する液体還元剤
タンクを、車両または機械の中で保温可能な部位に配置
した構成としている。Means for Solving the Problems, Actions and Effects To achieve the above object, the first invention is a vehicle or machine using a zinc oxide with a NOx reduction catalyst that uses a liquid reducing agent that freezes easily. A liquid reducing agent tank for storing the reducing agent is arranged in a heat-retainable portion of the vehicle or machine.

【０００７】第１発明によると、液体還元剤タンクを車
両または機械の中で保温可能な部位に配置したため、液
体還元剤の凍結防止に効果があり、簡単な構造でコスト
が安く、エネルギーを浪費しない。また、使用後もある
程度の温度が保たれるため、翌日の使用開始後の温度上
昇が早く、作業能率を向上させることができる。According to the first aspect of the invention, since the liquid reducing agent tank is arranged at a portion capable of keeping heat in the vehicle or machine, it is effective in preventing freezing of the liquid reducing agent, has a simple structure, is low in cost, and wastes energy. do not do. Further, since the temperature is maintained to some extent even after use, the temperature rises quickly after the start of use the next day, and the work efficiency can be improved.

【０００８】第２発明は、第１発明において、前記保温
可能な部位は、前記車両または機械に設けられた外装の
内部である構成としている。According to a second aspect of the present invention, in the first aspect of the present invention, the heat-retainable portion is located inside an exterior of the vehicle or machine.

【０００９】第２発明によると、液体還元剤タンクを外
装内部に配置したため、風雨にさらされることがないの
で保温され、液体還元剤の凍結防止に効果がある。According to the second aspect of the invention, since the liquid reducing agent tank is arranged inside the exterior, it is not exposed to wind and rain, so it is kept warm and effective in preventing freezing of the liquid reducing agent.

【００１０】第３発明は、第１発明において、前記保温
可能な部位は、前記車両または機械に設けられたエンジ
ンルームの内部である構成としている。According to a third aspect of the present invention, in the first aspect, the heat-retainable portion is inside an engine room provided in the vehicle or machine.

【００１１】第３発明によると、液体還元剤タンクはエ
ンジンルーム内部に配置されたため保温されるととも
に、稼動後のエンジンの温度上昇による周囲温度の上昇
により暖められる。また、エンジンの冷却ファンにより
熱交換器を通過する風で暖められる。According to the third aspect of the invention, the liquid reducing agent tank is placed inside the engine room so that it is kept warm and is warmed by the increase in ambient temperature due to the rise in temperature of the engine after operation. In addition, the engine cooling fan warms the air passing through the heat exchanger.

【００１２】第４発明は、第１発明において前記保温可
能な部位は、前記車両または機械に設けられた油圧機器
の近傍である構成としている。According to a fourth aspect of the present invention, in the first aspect, the heat-retainable portion is in the vicinity of a hydraulic device provided on the vehicle or machine.

【００１３】第４発明によると、稼動後の例えば油圧ポ
ンプ、バルブ、油圧モータ等の油圧機器の温度上昇によ
る周囲の温度上昇により液体還元剤タンクは暖められ
る。According to the fourth aspect of the invention, the liquid reducing agent tank is warmed by the temperature rise of the surroundings due to the temperature rise of the hydraulic equipment such as the hydraulic pump, the valve and the hydraulic motor after the operation.

【００１４】第５発明は、第１発明において、前記保温
可能な部位は、前記車両または機械に設けられた運転室
の内部である構成としている。In a fifth aspect based on the first aspect, the heat-retainable portion is inside a driver's cab provided in the vehicle or machine.

【００１５】第５発明によると、運転室内は外部より暖
かいため保温される。また、稼動後は空調を入れるので
さらに暖かくなり、液体還元剤タンクは暖められる。According to the fifth aspect of the present invention, the cab is kept warm because it is warmer than the outside. In addition, since the air conditioning is turned on after the operation, it becomes warmer and the liquid reducing agent tank is warmed up.

【００１６】第６発明は、第１発明において、前記保温
可能な部位は、前記車両または機械に設けられた燃料タ
ンクの近傍または内部である構成としている。According to a sixth aspect of the present invention, in the first aspect, the heat-retainable portion is near or inside a fuel tank provided in the vehicle or machine.

【００１７】第６発明によると、エンジンが稼動し始め
ると燃料噴射系で燃料が暖められ、内部に配置した液体
還元剤タンクは暖められるとともに保温される。また、
燃料タンクも暖かくなるので近傍に配置した液体還元剤
タンクは暖められる。According to the sixth aspect of the invention, when the engine starts operating, the fuel is warmed in the fuel injection system, and the liquid reducing agent tank disposed inside is warmed and kept warm. Also,
Since the fuel tank also becomes warm, the liquid reducing agent tank arranged in the vicinity can be warmed.

【００１８】第７発明は、第１発明において、前記保温
可能な部位は、前記車両または機械に設けられた作動油
タンクの近傍または内部である構成としている。In a seventh aspect based on the first aspect, the heat-retainable portion is near or inside a hydraulic oil tank provided in the vehicle or machine.

【００１９】第７発明によると、車両や機械を稼動させ
ると油圧機器で作動油が暖められ、内部に配置した液体
還元剤タンクは暖められるとともに保温される。また、
作動油タンクも暖かくなるので近傍に配置した液体還元
剤タンクは暖められる。According to the seventh aspect of the invention, when the vehicle or machine is operated, the hydraulic fluid is warmed by the hydraulic equipment, and the liquid reducing agent tank disposed inside is warmed and kept warm. Also,
Since the hydraulic oil tank also becomes warm, the liquid reducing agent tank arranged in the vicinity can be warmed.

【００２０】[0020]

【発明の実施の形態】以下に本発明に係るＮＯｘ還元触
媒用液体還元剤タンクの配置構造の実施形態について、
図面を参照して詳述する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the arrangement structure of a liquid reducing agent tank for a NOx reduction catalyst according to the present invention will be described below.
The details will be described with reference to the drawings.

【００２１】図１はＮＯｘ還元触媒付エンジンを搭載し
た車両の一例である油圧ショベル５０の外観斜視図であ
る。図１において、走行体５１に旋回自在に搭載された
上部旋回体１には、運転室２、エンジン、油圧機器等を
覆う外装３および作業機５２が搭載されている。FIG. 1 is an external perspective view of a hydraulic excavator 50 which is an example of a vehicle equipped with an engine equipped with a NOx reduction catalyst. In FIG. 1, an upper revolving structure 1 that is rotatably mounted on a traveling structure 51 has an exterior 3 that covers a driver's cab 2, an engine, hydraulic equipment, and a working machine 52.

【００２２】図２は前記の上部旋回体１の概略平面図で
ある。図２において、上部旋回体１には運転室２と、外
装３を構成するエンジンルーム４、タンクカバー５、お
よび油圧機器２０のバルブ２１を収納するバルブ室６が
搭載されている。エンジンルーム４内には吸い込み式の
冷却ファン１１と、油圧機器２０の油圧ポンプ２２とを
有するエンジン１０と、熱交換器１２としてのラジエー
タ１３、作動油クーラ１４、空冷式アフタークーラ１５
とが配置されている。タンクカバー５内には作動油タン
ク２３と燃料タンク２４とが配置されている。冷却風は
矢印ａのように外部から吸い込まれ、熱交換器１２を通
ってエンジンの周囲を矢印のように流れる。運転室２と
バルブ室６との間の上部旋回体１の中央部には、油圧機
器２０である旋回用の油圧モータ２６が配置されてい
る。FIG. 2 is a schematic plan view of the upper revolving superstructure 1. In FIG. 2, an upper slewing body 1 is equipped with a driver's cab 2, an engine compartment 4 that constitutes an exterior 3, a tank cover 5, and a valve compartment 6 that accommodates a valve 21 of a hydraulic device 20. An engine 10 having a suction type cooling fan 11 and a hydraulic pump 22 of a hydraulic device 20 in an engine room 4, a radiator 13 as a heat exchanger 12, a hydraulic oil cooler 14, an air-cooled aftercooler 15
And are arranged. A hydraulic oil tank 23 and a fuel tank 24 are arranged in the tank cover 5. The cooling air is sucked in from the outside as shown by the arrow a and flows through the heat exchanger 12 around the engine as shown by the arrow. A hydraulic motor 26 for revolving, which is a hydraulic device 20, is arranged in a central portion of the upper revolving superstructure 1 between the cab 2 and the valve chamber 6.

【００２３】液体還元剤タンクの配置構造の第１実施形
態は、図２において、液体還元剤タンク２５はエンジン
ルーム４内の熱交換器１２を通過する風の中のまたは
に配置されている。そのため液体還元剤タンク２５は
保温され、液体還元剤の凍結防止に効果がある。また、
エンジン１０始動後はエンジン１０の輻射熱と、熱交換
器１２を通過する風の熱とにより液体還元剤タンク２５
は暖められる。したがって、液体還元剤の凍結防止の効
果があり、エンジン始動後早期に液体還元剤の温度を上
昇させることができ、構造簡単でコストが安く、エネル
ギーを浪費することのないＮＯｘ還元触媒用液体還元剤
タンクの配置構造が得られる。In the first embodiment of the arrangement structure of the liquid reducing agent tank, in FIG. 2, the liquid reducing agent tank 25 is arranged in or in the wind passing through the heat exchanger 12 in the engine room 4. Therefore, the liquid reducing agent tank 25 is kept warm and effective in preventing the freezing of the liquid reducing agent. Also,
After the engine 10 is started, the radiant heat of the engine 10 and the heat of the wind passing through the heat exchanger 12 cause the liquid reducing agent tank 25 to flow.
Is warmed. Therefore, there is an effect of preventing the freezing of the liquid reducing agent, the temperature of the liquid reducing agent can be raised early after the engine is started, the structure is simple and the cost is low, and the energy is not wasted. The arrangement structure of the agent tank is obtained.

【００２４】以下、順次、他の実施形態について説明す
る。第２実施形態は図２において、液体還元剤タンク２
５はエンジンルーム４内の、油圧機器２０の１つである
油圧ポンプ２２の近傍のに配置されている。そのため
液体還元剤タンク２５は保温され、液体還元剤の凍結防
止に効果があるとともに、稼動後は油圧ポンプ２２の熱
により暖められる。Other embodiments will be sequentially described below. The second embodiment is a liquid reducing agent tank 2 in FIG.
5 is arranged in the engine room 4 in the vicinity of a hydraulic pump 22 which is one of the hydraulic devices 20. Therefore, the liquid reducing agent tank 25 is kept warm, which is effective in preventing freezing of the liquid reducing agent, and is warmed by the heat of the hydraulic pump 22 after the operation.

【００２５】第３実施形態は図２において、液体還元剤
タンク２５はバルブ室６内の、油圧機器２０の１つであ
るバルブ２１の近傍のに配置されている。そのため液
体還元剤タンク２５は保温され、液体還元材の凍結防止
に効果があるとともに、稼動後はバルブ２１の熱により
暖められる。In the third embodiment shown in FIG. 2, the liquid reducing agent tank 25 is arranged in the valve chamber 6 near the valve 21, which is one of the hydraulic devices 20. Therefore, the liquid reducing agent tank 25 is kept warm, which is effective in preventing freezing of the liquid reducing agent, and is warmed by the heat of the valve 21 after the operation.

【００２６】第４実施形態は図２において、液体還元剤
タンク２５は、運転室２とバルブ室６との間の上部旋回
体１の中央部で、油圧機器２０の１つである油圧モータ
２６の近傍のに配置されている。そのため液体還元剤
タンク２５は保温され、液体還元材の凍結防止に効果が
あるとともに、稼動後は油圧モータ２６の熱により暖め
られる。In the fourth embodiment shown in FIG. 2, a liquid reducing agent tank 25 is a central portion of the upper swing body 1 between the operator's cab 2 and the valve chamber 6 and is a hydraulic motor 26 which is one of the hydraulic devices 20. It is located near the. Therefore, the liquid reducing agent tank 25 is kept warm, which is effective in preventing freezing of the liquid reducing agent, and is warmed by the heat of the hydraulic motor 26 after the operation.

【００２７】第５実施形態は図２において、液体還元剤
タンク２５は運転室２内のに配置されている。そのた
め液体還元剤タンク２５は保温され、液体還元材の凍結
防止に効果があるとともに、稼動後は空調を入れるので
さらに暖かくなり、液体還元剤タンク２５は暖められ
る。In the fifth embodiment shown in FIG. 2, the liquid reducing agent tank 25 is arranged inside the operator's cab 2. Therefore, the liquid reducing agent tank 25 is kept warm, which is effective in preventing the freezing of the liquid reducing agent, and becomes warmer because the air conditioning is turned on after the operation, so that the liquid reducing agent tank 25 is warmed.

【００２８】第６実施形態は図２において、液体還元剤
タンク２５はエンジンルーム４内の、作動油タンク２３
の近傍のに配置されている。そのため液体還元剤タン
ク２５は保温され、液体還元剤の凍結防止に効果がある
とともに、稼動後は作動油タンク２３の熱により暖めら
れる。In the sixth embodiment shown in FIG. 2, the liquid reducing agent tank 25 is a hydraulic oil tank 23 in the engine room 4.
It is located near the. Therefore, the liquid reducing agent tank 25 is kept warm, which is effective in preventing freezing of the liquid reducing agent, and is warmed by the heat of the hydraulic oil tank 23 after the operation.

【００２９】図３は第７実施形態のものを示す。図２に
示したものと同一部材には同一符号を付して説明は省略
し、異なる部分についてのみ説明する。図２において、
液体還元剤タンク２５はタンクカバー５内の、作動油タ
ンク２３と燃料タンク２４との間のに配置されてい
る。そのため液体還元剤タンク２５は保温され、液体還
元剤の凍結防止に効果があるとともに、稼動後は作動油
タンク２３および燃料タンク２４の熱により暖められ
る。FIG. 3 shows the seventh embodiment. The same members as those shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. Only different portions will be described. In FIG.
The liquid reducing agent tank 25 is arranged in the tank cover 5 between the hydraulic oil tank 23 and the fuel tank 24. Therefore, the liquid reducing agent tank 25 is kept warm, which is effective in preventing freezing of the liquid reducing agent, and is warmed by the heat of the hydraulic oil tank 23 and the fuel tank 24 after the operation.

【００３０】図４は第８実施形態のものを示す。図３と
同様に図２と異なる部分についてのみ説明する。図４に
おいて、液体還元剤タンク２５はタンクカバー５内の、
燃料タンク２４の近傍のに配置されている。そのため
液体還元剤タンク２５は保温され、液体還元剤の凍結防
止に効果があるとともに、稼動後は燃料タンク２４の熱
により暖められる。FIG. 4 shows the eighth embodiment. Similar to FIG. 3, only parts different from FIG. 2 will be described. In FIG. 4, the liquid reducing agent tank 25 is inside the tank cover 5,
It is arranged near the fuel tank 24. Therefore, the liquid reducing agent tank 25 is kept warm, which is effective in preventing the liquid reducing agent from freezing, and is warmed by the heat of the fuel tank 24 after the operation.

【００３１】図５は第９実施形態のものを示す。図５に
おいて、液体還元剤タンク２５は作動油タンク２３また
は燃料タンク２４内に配置されている。そのため液体還
元剤タンク２５は保温され、液体還元剤の凍結防止に効
果があるとともに、稼動後は作動油や燃料の温度が上昇
するため暖められる。FIG. 5 shows the ninth embodiment. In FIG. 5, the liquid reducing agent tank 25 is arranged in the hydraulic oil tank 23 or the fuel tank 24. Therefore, the liquid reducing agent tank 25 is kept warm, which is effective for preventing freezing of the liquid reducing agent, and is warmed after the operation because the temperature of hydraulic oil and fuel rises.

【００３２】図６は第１０実施形態のブルドーザまたは
ホイールローダのエンジンルームの概略平面図である。
図６において、２は運転室、４はエンジンルーム、１０
はエンジン、１３はラジエータ、１４は作動油クーラで
あり、冷却ファン１１は押し出し式である。冷却風は矢
印ｂのようにエンジンルーム４の側面から吸い込んでラ
ジエータ１３の前方から排出する。液体還元剤タンク２
５はエンジンルーム４内の冷却ファン１１の近傍に配置
されている。そのため液体還元剤タンク２５は保温さ
れ、液体還元剤の凍結防止に効果があるとともに、エン
ジン１０始動後はエンジンの熱で暖められた風ｂにより
暖められる。FIG. 6 is a schematic plan view of the engine room of the bulldozer or wheel loader of the tenth embodiment.
In FIG. 6, 2 is a driver's cab, 4 is an engine room, and 10
Is an engine, 13 is a radiator, 14 is a hydraulic oil cooler, and the cooling fan 11 is a push type. The cooling air is sucked in from the side surface of the engine room 4 as shown by an arrow b and is discharged from the front of the radiator 13. Liquid reducing agent tank 2
5 is arranged in the engine room 4 in the vicinity of the cooling fan 11. Therefore, the liquid reducing agent tank 25 is kept warm, which is effective in preventing freezing of the liquid reducing agent, and is warmed by the wind b warmed by the heat of the engine after the engine 10 is started.

【図面の簡単な説明】[Brief description of drawings]

【図１】油圧ショベルの外観斜視図である。FIG. 1 is an external perspective view of a hydraulic excavator.

【図２】本発明の第１〜第６実施形態の液体還元剤タン
ク配置構造を示す概略図である。FIG. 2 is a schematic diagram showing a liquid reducing agent tank arrangement structure according to first to sixth embodiments of the present invention.

【図３】本発明の第７実施形態の液体還元剤タンク配置
構造を示す概略図である。FIG. 3 is a schematic diagram showing a liquid reducing agent tank arrangement structure according to a seventh embodiment of the present invention.

【図４】本発明の第８実施形態の液体還元剤タンク配置
構造を示す概略図である。FIG. 4 is a schematic diagram showing a liquid reducing agent tank arrangement structure according to an eighth embodiment of the present invention.

【図５】本発明の第９実施形態の液体還元剤タンク配置
構造を示す概略図である。FIG. 5 is a schematic diagram showing a liquid reducing agent tank arrangement structure according to a ninth embodiment of the present invention.

【図６】本発明の第１０実施形態の液体還元剤タンク配
置構造を示す概略図である。FIG. 6 is a schematic diagram showing a liquid reducing agent tank arrangement structure according to a tenth embodiment of the present invention.

【図７】従来の排気ガス浄化触媒用還元剤保温装置の概
念図である。FIG. 7 is a conceptual diagram of a conventional reducing agent heat retention device for an exhaust gas purification catalyst.

【符号の説明】[Explanation of symbols]

１…上部旋回体、２…運転室、３…外装、４…エンジン
ルーム、５…タンクカバー、６…バルブカバー、１０…
エンジン、１１…冷却ファン、１２…熱交換器、１３…
ラジエータ、１４…作動油クーラ、１５…空冷式アフタ
ークーラ、２０…油圧機器、２１…バルブ、２２…油圧
ポンプ、２３…作動油タンク、２４…燃料タンク、２５
…液体還元剤タンク、２６…油圧モータ。1 ... Upper swing body, 2 ... Operator's cab, 3 ... Exterior, 4 ... Engine room, 5 ... Tank cover, 6 ... Valve cover, 10 ...
Engine, 11 ... Cooling fan, 12 ... Heat exchanger, 13 ...
Radiator, 14 ... Hydraulic oil cooler, 15 ... Air-cooled aftercooler, 20 ... Hydraulic equipment, 21 ... Valve, 22 ... Hydraulic pump, 23 ... Hydraulic oil tank, 24 ... Fuel tank, 25
... liquid reducing agent tank, 26 ... hydraulic motor.

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 凍結し易い液体還元剤を用いるＮＯｘ還
元触媒付エンジンを用いた車両または機械において、前
記液体還元剤を貯留する液体還元剤タンク(25)を、車両
または機械の中で保温可能な部位に配置したことを特徴
とするＮＯｘ還元触媒用液体還元剤タンクの配置構造。1. In a vehicle or machine using an engine with a NOx reduction catalyst that uses a liquid reducing agent that freezes easily, a liquid reducing agent tank (25) that stores the liquid reducing agent can be kept warm in the vehicle or the machine. A structure for arranging a liquid reducing agent tank for a NOx reduction catalyst, which is characterized in that it is arranged at various positions. 【請求項２】 請求項１記載のＮＯｘ還元触媒用液体還
元剤タンクの配置構造において、前記保温可能な部位
は、前記車両または機械に設けられた外装(3)の内部で
あることを特徴とするＮＯｘ還元触媒用液体還元剤タン
クの配置構造。2. The arrangement structure of a liquid reducing agent tank for a NOx reduction catalyst according to claim 1, wherein the heat-retainable portion is inside an exterior (3) provided in the vehicle or the machine. Arrangement structure of liquid reducing agent tank for NOx reduction catalyst. 【請求項３】 請求項１記載のＮＯｘ還元触媒用液体還
元剤タンクの配置構造において、前記保温可能な部位
は、前記車両または機械に設けられたエンジンルーム
(4)の内部であることを特徴とするＮＯｘ還元触媒用液
体還元剤タンクの配置構造。3. The NOx reduction catalyst liquid reducing agent tank arrangement structure according to claim 1, wherein the heat-retainable portion is an engine room provided in the vehicle or machine.
The arrangement structure of the liquid reducing agent tank for the NOx reduction catalyst, which is inside (4). 【請求項４】 請求項１記載のＮＯｘ還元触媒用液体還
元剤タンクの配置構造において、前記保温可能な部位
は、前記車両または機械に設けられた油圧機器(20)の近
傍であることを特徴とするＮＯｘ還元触媒用液体還元剤
タンクの配置構造。4. The arrangement structure of a liquid reducing agent tank for a NOx reduction catalyst according to claim 1, wherein the heat-retainable portion is near a hydraulic device (20) provided in the vehicle or the machine. The arrangement structure of the liquid reducing agent tank for the NOx reduction catalyst. 【請求項５】 請求項１記載のＮＯｘ還元触媒用液体還
元剤タンクの配置構造において、前記保温可能な部位
は、前記車両または機械に設けられた運転室(2)の内部
であることを特徴とするＮＯｘ還元触媒用液体還元剤タ
ンクの配置構造。5. The arrangement structure of the liquid reducing agent tank for NOx reduction catalyst according to claim 1, wherein the heat-retainable portion is inside a driver's cab (2) provided in the vehicle or machine. The arrangement structure of the liquid reducing agent tank for the NOx reduction catalyst. 【請求項６】 請求項１記載のＮＯｘ還元触媒用液体還
元剤タンクの配置構造において、前記保温可能な部位
は、前記車両または機械に設けられた燃料タンク(24)の
近傍または内部であることを特徴とするＮＯｘ還元触媒
用液体還元剤タンクの配置構造。6. The arrangement structure for a liquid reducing agent tank for a NOx reduction catalyst according to claim 1, wherein the heat-retainable portion is near or inside a fuel tank (24) provided in the vehicle or machine. The arrangement structure of the liquid reducing agent tank for the NOx reduction catalyst, which is characterized by 【請求項７】 請求項１記載のＮＯｘ還元触媒用液体還
元剤タンクの配置構造において、前記保温可能な部位
は、前記車両または機械に設けられた作動油タンク(23)
の近傍または内部であることを特徴とするＮＯｘ還元触
媒用液体還元剤タンクの配置構造。7. The arrangement structure of a liquid reducing agent tank for a NOx reduction catalyst according to claim 1, wherein the heat-retainable portion is a hydraulic oil tank (23) provided in the vehicle or machine.
A structure for arranging a liquid reducing agent tank for a NOx reduction catalyst, which is located in the vicinity of or inside.
JP2001201736A 2001-07-03 2001-07-03 ARRANGEMENT STRUCTURE FOR LIQUID REDUCING AGENT TANK FOR NOx REDUCTION CATALYST Pending JP2003020936A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001201736A JP2003020936A (en) 2001-07-03 2001-07-03 ARRANGEMENT STRUCTURE FOR LIQUID REDUCING AGENT TANK FOR NOx REDUCTION CATALYST

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001201736A JP2003020936A (en) 2001-07-03 2001-07-03 ARRANGEMENT STRUCTURE FOR LIQUID REDUCING AGENT TANK FOR NOx REDUCTION CATALYST

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