JP6897634B2 - Work vehicle - Google Patents

Work vehicle Download PDF

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JP6897634B2
JP6897634B2 JP2018105375A JP2018105375A JP6897634B2 JP 6897634 B2 JP6897634 B2 JP 6897634B2 JP 2018105375 A JP2018105375 A JP 2018105375A JP 2018105375 A JP2018105375 A JP 2018105375A JP 6897634 B2 JP6897634 B2 JP 6897634B2
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fuel tank
fuel
tank
pipe
connection portion
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JP2019209741A (en
Inventor
脇野　崇
崇 脇野
土居　一紀
一紀 土居
高橋　誠之
誠之 高橋
智弘 伊賀上
智弘 伊賀上
健司 野原
健司 野原
智志 山下
智志 山下
清宏 塚本
清宏 塚本
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Iseki and Co Ltd
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Iseki and Co Ltd
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Priority to JP2018105375A priority Critical patent/JP6897634B2/en
Priority to TW108116891A priority patent/TW202003289A/en
Priority to KR1020190062984A priority patent/KR20190136970A/en
Priority to CN201910461125.7A priority patent/CN110549844A/en
Priority to CN201910460728.5A priority patent/CN110549842A/en
Publication of JP2019209741A publication Critical patent/JP2019209741A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/01—Arrangement of fuel conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03118—Multiple tanks, i.e. two or more separate tanks
    • B60K2015/03144—Fluid connections between the tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Description

本発明は、農業用トラクタ等の作業車両に関し、特に燃料タンク構成に関する。 The present invention relates to a work vehicle such as an agricultural tractor, and more particularly to a fuel tank configuration.

作業車両の一例としての農業用トラクタにおいて、燃料タンク容量を増大するためミッションケースの左右にタンクを配置する構成とし、左右の燃料タンク間に連結管を設けて燃料流通可能とし、この連結管を燃料タンク底部より低位置に設けてエンジンへの燃料供給管を接続する構成がある（特許文献１）。 In an agricultural tractor as an example of a work vehicle, tanks are arranged on the left and right sides of the mission case in order to increase the fuel tank capacity, and connecting pipes are provided between the left and right fuel tanks to enable fuel flow. There is a configuration in which a fuel supply pipe to the engine is connected by providing the fuel tank at a position lower than the bottom of the fuel tank (Patent Document 1).

また、連結管内に逆止弁を設けて燃料の逆流片寄りを防止する構成が公知である（特許文献２）。 Further, it is known that a check valve is provided in the connecting pipe to prevent the backflow of fuel from shifting to one side (Patent Document 2).

特許第５７２６５４０号公報Japanese Patent No. 5726540 特開２００７−２９７００６号公報JP-A-2007-297006

ところで、特許文献１の燃料タンク構成は、連通管における燃料供給口の位置に改良を加えることによって、容量の大きい燃料タンク側に片寄った燃料が燃料供給口に届き易い効果があるが、燃料供給口を左右を連結する連結管に設けるものであるから、走行車体が左右傾斜時、傾斜低位側の燃料タンクの液面より連通管の液面は変動しやすくエア噛みの恐れがある。 By the way, the fuel tank configuration of Patent Document 1 has an effect that the fuel biased toward the fuel tank having a large capacity can easily reach the fuel supply port by improving the position of the fuel supply port in the communication pipe. Since the mouth is provided on the connecting pipe connecting the left and right, when the traveling vehicle body is tilted left and right, the liquid level of the communicating pipe is more likely to fluctuate than the liquid level of the fuel tank on the lower tilt side, and there is a risk of air biting.

また、特許文献２の構成では、逆止弁を設けて燃料の逆流を防止するため、連通管に燃料供給口を設けず左右燃料タンクの一方に燃料供給口を設ける形態で有利であるが、燃料の貯留量が多いとき左右バランスを損なう恐れがある。 Further, in the configuration of Patent Document 2, in order to prevent the backflow of fuel by providing a check valve, it is advantageous to provide a fuel supply port on one of the left and right fuel tanks without providing a fuel supply port on the communication pipe. When the amount of fuel stored is large, the left-right balance may be impaired.

本発明は上記に鑑み、一方のタンクに燃料供給管を接続する構成としながら、左右バランスを維持しつつ、エア噛みの少ない燃料タンク構成を得ようとする。 In view of the above, the present invention attempts to obtain a fuel tank configuration with less air biting while maintaining a left-right balance while connecting a fuel supply pipe to one of the tanks.

この発明は、上記課題を解決すべく次のような技術的手段を講じた。 The present invention has taken the following technical measures to solve the above problems.

第１の本発明は、走行車体（１）にエンジン（Ｅ）を搭載し、前記走行車体（１）を構成するミッションケース（３）の左右側に、給油口（２０ａ）を設けた第１燃料タンク（２０Ｌ）と前記エンジン（Ｅ）への燃料供給口（３０ａ）を有する第２燃料タンク（２０Ｒ）を備え、一端を前記第１燃料タンク（２０Ｌ）に接続した連通管（３１）の他端と前記連通管（３１）を分岐する分岐管部（３１ｄ）とを前記第２燃料タンク（２０Ｒ）に接続し、前記連通管（３１）には、前記分岐管部（３１ｄ）への分岐部と前記第２燃料タンク（２０Ｒ）との間に逆止弁（３２）を配置し、前記第１燃料タンク（２０Ｌ）の接続部（３１Ａ）から前記第２燃料タンク（２０Ｒ）の前記連通管（３１）との接続部（３１Ｂ）側への燃料流通を許容するが前記第２燃料タンク（２０Ｒ）の前記連通管（３１）との前記接続部（３１Ｂ）から前記第１燃料タンク（２０Ｌ）の前記接続部（３１Ａ）側への逆流を阻止する構成とした作業車両である。
第２の本発明は、前記第１燃料タンク（２０Ｌ）の底面を前記第２燃料タンク（２０Ｒ）の底面より高く設け、前記連結管（３１）の前記第２燃料タンク（２０Ｒ）との前記接続部（３１Ｂ）よりも上位置に前記分岐管部（３１ｄ）の前記第２燃料タンク（２０Ｒ）への接続部（３１Ｃ）を配置した第１の本発明の作業車両である。
本発明に関連する第１の発明は、走行車体１にエンジンＥを搭載し、走行車体１を構成するミッションケース３の左右側に、給油口２０ａを設けた第１燃料タンク２０ＬとエンジンＥへの燃料供給口３０ａを有する第２燃料タンク２０Ｒを備え、一端を第１燃料タンク２０Ｌに接続した連通管３１の他端と連通管３１を分岐する分岐管部３１ｄとを第２燃料タンク２０Ｒに接続し、連通管３１には、分岐管部３１ｄへの分岐部と第２燃料タンク２０Ｒとの間に逆止弁３２を配置し、第１燃料タンク２０Ｌの接続部３１Ａから第２燃料タンク２０Ｒの接続部３１Ｂ側への燃料流通を許容するが第２燃料タンク２０Ｒの接続部３１Ｂから第１燃料タンク２０Ｌの接続部３１Ａ側への逆流を阻止する構成とした。 According to the first aspect of the present invention, the engine (E) is mounted on the traveling vehicle body (1), and fuel filler ports (20a) are provided on the left and right sides of the mission case (3) constituting the traveling vehicle body (1). A communication pipe (31) having a fuel tank (20L) and a second fuel tank (20R) having a fuel supply port (30a) to the engine (E), one end of which is connected to the first fuel tank (20L). The other end and the branch pipe portion (31d) that branches the communication pipe (31) are connected to the second fuel tank (20R), and the communication pipe (31) is connected to the branch pipe portion (31d). A check valve (32) is arranged between the branch portion and the second fuel tank (20R), and the connection portion (31A) of the first fuel tank (20L) is connected to the second fuel tank (20R). Although fuel flow to the connection portion (31B) side with the communication pipe (31) is permitted, the first fuel tank from the connection portion (31B) with the communication pipe (31) of the second fuel tank (20R). This is a work vehicle configured to prevent backflow of (20L) to the connection portion (31A) side.
In the second invention, the bottom surface of the first fuel tank (20L) is provided higher than the bottom surface of the second fuel tank (20R), and the connecting pipe (31) is connected to the second fuel tank (20R). This is the first work vehicle of the present invention in which the connection portion (31C) of the branch pipe portion (31d) to the second fuel tank (20R) is arranged above the connection portion (31B).
First invention relating to the present invention is equipped with the engine E to the vehicle body 1, the left and right side of the transmission case 3 of the vehicle body 1, to the first fuel tank 20L and the engine E provided with the fuel supply port 20a A second fuel tank 20R having the fuel supply port 30a of the above is provided, and the other end of the communication pipe 31 having one end connected to the first fuel tank 20L and the branch pipe portion 31d branching the communication pipe 31 into the second fuel tank 20R. A check valve 32 is arranged between the branch portion to the branch pipe portion 31d and the second fuel tank 20R in the communication pipe 31, and the connection portion 31A to the second fuel tank 20R of the first fuel tank 20L is arranged. The fuel flow to the connection portion 31B side of the first fuel tank 20L is allowed, but the backflow from the connection portion 31B of the second fuel tank 20R to the connection portion 31A side of the first fuel tank 20L is prevented.

本発明に関連する第２の発明は、本発明に関連する第１の発明において、第１燃料タンク２０Ｌの底面を第２燃料タンク２０Ｒの底面より高く設け、連結管３１の第２燃料タンク２０Ｒとの接続部３１Ｂよりも上位置に分岐管部３１ｄの第２燃料タンク２０Ｒへの接続部３１Ｃを配置した。 The second invention relating to the present invention, in the first invention relating to the present invention, the bottom surface of the first fuel tank 20L provided higher than the bottom surface of the second fuel tank 20R, the second fuel tank 20R connecting pipe 31 The connection portion 31C of the branch pipe portion 31d to the second fuel tank 20R was arranged at a position above the connection portion 31B with the fuel tank.

本発明によると、逆止弁３２を設けることによりエンジンＥへの燃料供給管３０接続側の燃料タンク２０Ｒ側に燃料を残すことができ、また燃料量が多いときは分岐管部３１ｄを経由して燃料を第１燃料タンク２０Ｌ側に戻すことによって第２燃料タンク２０Ｒ側に過剰に貯留することがなく、左右バランスを保つことができ、加えてエア噛みを抑制できる。
本発明に関連する第１の発明によると、逆止弁３２を設けることによりエンジンＥへの燃料供給管３０接続側の燃料タンク２０Ｒ側に燃料を残すことができ、また燃料量が多いときは分岐管部３１ｄを経由して燃料を第１燃料タンク２０Ｌ側に戻すことによって第２燃料タンク２０Ｒ側に過剰に貯留することがなく、左右バランスを保つことができ、加えてエア噛みを抑制できる。 According to the present invention, by providing the check valve 32, fuel can be left on the fuel tank 20R side on the fuel supply pipe 30 connection side to the engine E, and when the amount of fuel is large, the fuel can be left via the branch pipe portion 31d. By returning the fuel to the first fuel tank 20L side, the left and right balance can be maintained without excessive storage on the second fuel tank 20R side, and in addition, air biting can be suppressed.
According to the present invention relating to the present invention, it can leave the fuel in the fuel tank 20R side of the fuel supply pipe 30 connecting side to the engine E by providing a check valve 32, and when the amount of the fuel is large By returning the fuel to the first fuel tank 20L side via the branch pipe portion 31d, the left and right balance can be maintained without excessive storage on the second fuel tank 20R side, and in addition, air biting can be suppressed. ..

本発明に関連する第２の発明によると、本発明に関連する第１の発明の効果に加え、第１燃料タンク２０Ｌへの残量を極力少なくすることができる。 According to a second invention relating to the present invention, in addition to the effects of the first invention relating to the present invention, the remaining amount of the first fuel tank 20L can be minimized.

トラクタの側面図である。It is a side view of a tractor. 要部を上方からみた斜視図である。It is a perspective view which looked at the main part from above. 要部を下方からみた斜視図である。It is a perspective view which looked at the main part from the bottom. 要部の正面図である。It is a front view of a main part. 要部の拡大正面図である。It is an enlarged front view of a main part. ステップ部の斜視図である。It is a perspective view of a step part.

以下に、本発明に係る実施形態を図面に基づいて詳細に説明する。 Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

図１は、トラクタを示すものであり、この走行車体１前部のボンネット２内部にディーゼルエンジンＥを搭載し、このエンジンＥの回転動力をミッションケース３内の変速装置に伝え、この変速装置で減速された回転動力を前輪４及び後輪５に伝えるようにしている。エンジンＥの後方に前輪４，４を操舵するステアリングハンドル６が装備され、更に、その後方には運転席７が設置されている。ミッションケース３の後上部には油圧シリンダケース８を備え、このシリンダケース８の左右両側には、油圧昇降機構の一部を構成するリフトアーム９が回動自在に取り付けられている。リフトアーム９は昇降用油圧シリンダ１０の伸縮作動により上下動する。車体後部には、トップリンク１１と左右のロアーリンク１２からなる３点リンク機構を設け、同リンク機構にロータリ作業機Ｒを装着し、リフトロッド１３を介してロアーリンク１２をリフトアーム９に連結することにより、作業機Ｒを昇降可能に構成している。 FIG. 1 shows a tractor. A diesel engine E is mounted inside the bonnet 2 at the front of the traveling vehicle body 1, and the rotational power of the engine E is transmitted to the transmission in the transmission case 3, and the transmission is used. The decelerated rotational power is transmitted to the front wheels 4 and the rear wheels 5. A steering wheel 6 for steering the front wheels 4 and 4 is installed behind the engine E, and a driver's seat 7 is installed behind the steering wheel 6. A hydraulic cylinder case 8 is provided in the upper rear portion of the mission case 3, and lift arms 9 forming a part of the hydraulic lifting mechanism are rotatably attached to both left and right sides of the cylinder case 8. The lift arm 9 moves up and down by the expansion and contraction operation of the lifting hydraulic cylinder 10. A three-point link mechanism consisting of a top link 11 and left and right lower links 12 is provided at the rear of the vehicle body, a rotary work machine R is attached to the link mechanism, and the lower link 12 is connected to the lift arm 9 via a lift rod 13. By doing so, the work machine R can be raised and lowered.

前記ハンドル６や運転席７等は、キャビン１６によって覆われている。キャビン１６は、例えば防振ゴム等の弾性部材を介して機体に固定されてあり、機体の振動がキャビンに伝達されにくくしている。 The steering wheel 6, the driver's seat 7, and the like are covered with the cabin 16. The cabin 16 is fixed to the airframe via an elastic member such as anti-vibration rubber, making it difficult for the vibration of the airframe to be transmitted to the cabin.

また、キャビン１６は、フロア１７と、フロア１７左右前部に立設した前支柱１６ａと、左右フェンダー１８中間部に立設する後支柱１６ｂと、これら支柱上端同士を接続する上フレーム１６ｃとによって一体化した枠組み構成とし、天井部１６ｄで覆われている。 Further, the cabin 16 is provided by the floor 17, the front columns 16a erected on the left and right front parts of the floor 17, the rear columns 16b erected in the middle of the left and right fenders 18, and the upper frame 16c connecting the upper ends of these columns. It has an integrated framework and is covered with a ceiling 16d.

ミッションケース３の左右両側には樹脂材より成型された燃料タンク２０を配置する。すなわち燃料タンク２０は、図２〜図６に示すように、樹脂性からなりブロー成形によって製作されて、ミッションケース３の左右に配置される構成である。左右一方の第１燃料タンク２０Ｌのタンク容量が左右他方の第２燃料タンク２０Ｒの容量よりも小に製作されている。このうち第１燃料タンク２０Ｌは、ミッションケース３に近い本体部２０Ｌａと外方に位置する延長部２０Ｌｂとに形成され、本体部２０Ｌａの底部をミッションケース３に連結された第１支持プレート２１によって支持し、延長部２０Ｌｂを該第１支持プレート２１に固定連結する第２支持プレート２２によって支持している。 Fuel tanks 20 molded from a resin material are arranged on both the left and right sides of the mission case 3. That is, as shown in FIGS. 2 to 6, the fuel tank 20 is made of resin, is manufactured by blow molding, and is arranged on the left and right sides of the mission case 3. The tank capacity of the first fuel tank 20L on one of the left and right sides is smaller than the capacity of the second fuel tank 20R on the other side. Of these, the first fuel tank 20L is formed by a main body portion 20La close to the mission case 3 and an extension portion 20Lb located on the outside, and the bottom portion of the main body portion 20La is connected to the mission case 3 by a first support plate 21. It is supported and the extension portion 20Lb is supported by the second support plate 22 which is fixedly connected to the first support plate 21.

なお、上記第１燃料タンク２０Ｌの直前に、尿素ＳＣＲシステムの尿素タンク２３を配置している。この尿素タンク２３の下部を支持する支持プレート２４をミッションケース３に支持してなり、この尿素タンク支持プレート２４は前記第１燃料タンク２０Ｌの第２支持プレート２２を連結して該燃料タンク２０Ｌの荷重を分担して受けている。 The urea tank 23 of the urea SCR system is arranged immediately before the first fuel tank 20L. A support plate 24 that supports the lower portion of the urea tank 23 is supported by the mission case 3, and the urea tank support plate 24 connects the second support plate 22 of the first fuel tank 20L to the fuel tank 20L. The load is shared and received.

第１燃料タンク２０Ｌの支持構成について、延長部２０Ｌｂは、帯プレート２５Ｌをもって支持される。ミッションケース３から左右に張り出し状態にキャビン支持ブラケット３９Ｌと補助ブラケット４０Ｌを設け、これらの先端側に帯プレート２５Ｌを吊り下げ支持している。 Regarding the support configuration of the first fuel tank 20L, the extension portion 20Lb is supported by the band plate 25L. A cabin support bracket 39L and an auxiliary bracket 40L are provided so as to project from the mission case 3 to the left and right, and a band plate 25L is suspended and supported on the tip side thereof.

なお、第１燃料タンク２０Ｌは樹脂のブロー成型によって前記本体部２０Ｌａと延長部２０Ｌｂとに成形されるもので、このうち延長部２０Ｌｂには給油部としての給油口２０ａを形成し、給油蓋２７を着脱自在に装着している。 The first fuel tank 20L is formed into the main body portion 20La and the extension portion 20Lb by blow molding of resin. Of these, the extension portion 20Lb is formed with a fuel filler port 20a as a fuel filler portion, and a fuel filler lid 27 is formed. Is detachably attached.

次いで、前記他方の第２燃料タンク２０Ｒについて、本体部２０Ｒａと延長部２０Ｒｂに成形されるが、タンク底部を受ける第２燃料タンク２０Ｒ用の支持プレート２８は前後の門型鋼材を連結するプレート枠に形成され、第２燃料タンク２０Ｒｈは、この支持プレート２８を、ブラケット２９ａ，２９ｂを介してミッションケース３側側壁又は底壁に固定することにより支持されている。この第２燃料タンク２０Ｒ側において、前側下部位置に燃料供給口３０ａを形成しこの燃料供給口３０ａに燃料供給管３０の一端を接続し、図外燃料ポンプを介し前記エンジンＥへ燃料を供給すべく燃料供給管３０他端をエンジンＥに接続している。 Next, the other second fuel tank 20R is formed into a main body portion 20Ra and an extension portion 20Rb, and the support plate 28 for the second fuel tank 20R that receives the bottom of the tank is a plate frame that connects the front and rear portal steel materials. The second fuel tank 20Rh is supported by fixing the support plate 28 to the side wall surface or the bottom wall of the mission case 3 via the brackets 29a and 29b. On the second fuel tank 20R side, a fuel supply port 30a is formed at a lower position on the front side, one end of a fuel supply pipe 30 is connected to the fuel supply port 30a, and fuel is supplied to the engine E via an unexpected fuel pump. The other end of the fuel supply pipe 30 is connected to the engine E as much as possible.

前記第１燃料タンク２０Ｌと第２燃料タンク２０Ｒの配置関係は、各タンク前端部は、容量の大きい第２燃料タンク２０Ｒ側が前方に、容量の少ない第１燃料タンク２０Ｌ側が前記尿素タンク２３配置との関係もあって後方に存在位置する関係となっている。一方各後端部は、第１燃料タンク２０Ｌの後端が第２燃料タンク２０Ｒの後端の前位置になる関係である。 Regarding the arrangement relationship between the first fuel tank 20L and the second fuel tank 20R, at the front end of each tank, the second fuel tank 20R side having a large capacity is arranged forward, and the urea tank 23 is arranged on the first fuel tank 20L side having a small capacity. There is also a relationship of, and it is a relationship that exists behind. On the other hand, each rear end portion has a relationship in which the rear end of the first fuel tank 20L is in the front position of the rear end of the second fuel tank 20R.

また、前記第１燃料タンク２０Ｌと第２燃料タンク２０Ｒの底面高さは異なってミッションケース３に装着されていて、第１燃料タンク２０Ｌの底面を第２燃料タンク２０Ｒの底面より高く設けている。 Further, the heights of the bottom surfaces of the first fuel tank 20L and the second fuel tank 20R are differently mounted on the mission case 3, and the bottom surface of the first fuel tank 20L is provided higher than the bottom surface of the second fuel tank 20R. ..

前記のように第１燃料タンク２０Ｌ側に給油口２０ａを設けるため、第１燃料タンク２０Ｌと第２燃料タンク２０Ｒは、樹脂性の連結管３１で連結されている。すなわち、第１燃料タンク２０Ｌの前側下部内側に一端を連結された連結管３１は、ほぼ同径で直状であるが途中緩傾斜を形成すべく第１，第２屈曲部３１ａ，３１ｂとクランク状の第３屈曲部３１ｃが形成されている。連結管３１の他端は、第２燃料タンク２０Ｒの前側下部内側に接続されるように設けられている。 Since the fuel filler port 20a is provided on the side of the first fuel tank 20L as described above, the first fuel tank 20L and the second fuel tank 20R are connected by a resin connecting pipe 31. That is, the connecting pipe 31 having one end connected to the inside of the lower front side of the first fuel tank 20L has substantially the same diameter and is straight, but is cranked with the first and second bent portions 31a and 31b in order to form a gentle inclination in the middle. A shaped third bent portion 31c is formed. The other end of the connecting pipe 31 is provided so as to be connected to the inside of the lower front side of the second fuel tank 20R.

更に、上記第３屈曲部３１ｃの近傍で第１燃料タンク２０Ｌ寄りの箇所から分岐して第２燃料タンク２０Ｒの前側中間部高さに接続された分岐管部３１ｄを設けている。前記のように第１燃料タンク２０Ｌと第２燃料タンク２０Ｒの底面の地上高さは異ならせて設けており、連結管３１の接続部をこの底面に沿わせる構成とするものであるから、図５に示すように、第１燃料タンク２０Ｌと連結管３１との接続部３１Ａは、第２燃料タンク２０Ｒと連結管３１との接続部３１Ｂに対して高さＨ１高く設定され、また第２燃料タンク２０Ｒと上記分岐管部３１ｄとの接続部３１Ｃは、第２燃料タンク２０Ｒと連結管３１との接続部３１Ｂに対して高さＨ２高く設定している。なお、この高さＨ２は上記高さＨ１より大に設定している。 Further, a branch pipe portion 31d is provided near the third bent portion 31c, which is branched from a portion closer to the first fuel tank 20L and connected to the height of the front intermediate portion of the second fuel tank 20R. As described above, the ground heights of the bottom surfaces of the first fuel tank 20L and the second fuel tank 20R are different from each other, and the connecting portion of the connecting pipe 31 is configured to be along the bottom surface. As shown in 5, the connecting portion 31A between the first fuel tank 20L and the connecting pipe 31 is set to have a height H1 higher than the connecting portion 31B between the second fuel tank 20R and the connecting pipe 31, and the second fuel The height H2 of the connecting portion 31C between the tank 20R and the branch pipe portion 31d is set higher than that of the connecting portion 31B between the second fuel tank 20R and the connecting pipe 31. The height H2 is set to be larger than the height H1.

なお、エンジンＥへの前記燃料供給管３０を接続する第２燃料タンク２０Ｒの燃料供給口３０ａは、第２燃料タンク２０Ｒの最も低い位置に接続構成されている。 The fuel supply port 30a of the second fuel tank 20R that connects the fuel supply pipe 30 to the engine E is connected to the lowest position of the second fuel tank 20R.

ついで、前記連結管３１の第３屈曲部３１ｃと第２燃料タンク２０Ｒとの間、換言すると、連結管３１と分岐管部３１ｄとの分岐部よりも第２燃料タンク２０Ｒに近い側に、逆止弁３２を設けている。この逆止弁３２は、例えば特許文献２の図８に示す薄膜状の弁本体を採用し、第１燃料タンク２０Ｌから第２燃料タンク２０Ｒ側への燃料流入は許容するが、逆の第２燃料タンク２０Ｒから第１燃料タンク２０Ｌへの流入を阻止できる構成としている。 Then, between the third bent portion 31c of the connecting pipe 31 and the second fuel tank 20R, in other words, the side closer to the second fuel tank 20R than the branch portion between the connecting pipe 31 and the branch pipe portion 31d is reversed. A check valve 32 is provided. The check valve 32 adopts, for example, a thin-film valve body shown in FIG. 8 of Patent Document 2, and allows fuel to flow from the first fuel tank 20L to the second fuel tank 20R side, but reverses the second. The configuration is such that the inflow from the fuel tank 20R to the first fuel tank 20L can be blocked.

前記のように構成された燃料タンク２０のうち、給油蓋２７を外し給油孔２０ａから燃料（軽油）を注ぐとまず第１燃料タンク２０Ｌに入り、連結管３１及び連結管３１内逆止弁３２を経由して第２燃料タンク２０Ｒにも入る。徐々に燃料量が増加すると、連結管３１及び分岐管部３１Ｄの両接続部３１Ｂ，３１Ｃから第２燃料タンク２０Ｒ内に流入しこの第２燃料タンク２０Ｒの燃料量も増加する。 Of the fuel tank 20 configured as described above, when the fuel filler lid 27 is removed and fuel (light oil) is poured from the fuel filler hole 20a, the fuel (light oil) first enters the first fuel tank 20L, and the connecting pipe 31 and the check valve 32 in the connecting pipe 31 are entered. It also enters the second fuel tank 20R via. When the amount of fuel gradually increases, the amount of fuel flows into the second fuel tank 20R from both the connecting portions 31B and 31C of the connecting pipe 31 and the branch pipe portion 31D, and the amount of fuel in the second fuel tank 20R also increases.

そして、エンジンＥ作動によって燃料消費されるが、走行中に走行車体１が左右に傾斜すると、連結管３１を経由して第１燃料タンク２０Ｌと第２燃料タンク２０Ｒとの間を燃料は行き来しながら左右バランスを保つことができる。詳細には、燃料量が第２燃料タンク２０Ｒの分岐管部３１ｄの接続部３１Ｃを越える状態の場合、走行車体１が傾斜して第２燃料タンク２０Ｒ側が高くなると分岐管部３１ｄを経由して第１燃料タンク２０Ｌ側に戻るよう流動しうるが、逆止弁３２の存在のため第２燃料タンク２０Ｒの接続部３１Ｂから第１燃料タンク２０Ｌへの戻り流動は阻止される。また水平姿勢で燃料量が第２燃料タンク２０Ｒの分岐管部３１ｄの接続部３１Ｃ以下となると、第２燃料タンク２０Ｒ側が高くなっても燃料はこの接続部３１Ｃを超え得ないため第１燃料タンク２０Ｌ側に戻り流動できない。 Then, fuel is consumed by the operation of the engine E, but when the traveling vehicle body 1 tilts to the left or right during traveling, the fuel moves back and forth between the first fuel tank 20L and the second fuel tank 20R via the connecting pipe 31. However, the left-right balance can be maintained. Specifically, when the amount of fuel exceeds the connecting portion 31C of the branch pipe portion 31d of the second fuel tank 20R, when the traveling vehicle body 1 is tilted and the second fuel tank 20R side becomes higher, the fuel tank 20R is routed via the branch pipe portion 31d. Although it can flow back to the first fuel tank 20L side, the presence of the check valve 32 prevents the return flow from the connection portion 31B of the second fuel tank 20R to the first fuel tank 20L. Further, when the fuel amount is equal to or less than the connection portion 31C of the branch pipe portion 31d of the second fuel tank 20R in the horizontal posture, the fuel cannot exceed this connection portion 31C even if the second fuel tank 20R side becomes higher, so that the first fuel tank It returns to the 20L side and cannot flow.

なお、第１燃料タンク２０Ｌ側が高くなる場合には、少量となっても連結管３１の逆止弁３２部を通過し得て接続部３１Ｂから出て燃料タンク２０Ｌに流入することができる。さらに、第２燃料タンク２０Ｒの接続部３１Ｂは第１燃料タンク２０Ｌの接続部３１Ａより高さＨ１低いから、少量となる残量燃料は全て第２燃料タンク２０Ｒ側に移動できる。 When the first fuel tank 20L side becomes higher, even if the amount is small, it can pass through the check valve 32 portion of the connecting pipe 31 and exit from the connecting portion 31B and flow into the fuel tank 20L. Further, since the connecting portion 31B of the second fuel tank 20R is lower in height H1 than the connecting portion 31A of the first fuel tank 20L, all the remaining fuel, which is a small amount, can be moved to the second fuel tank 20R side.

エンジンＥへの燃料供給は、第２燃料タンク２０Ｒに接続する燃料供給管３０からエンジンＥに供給されるが、この燃料供給管３０は、第２燃料タンク２０Ｒのできるだけ底部に形成した燃料供給口３０ａから供給される構成としており、燃料残量を少なくできる。 The fuel supply to the engine E is supplied to the engine E from the fuel supply pipe 30 connected to the second fuel tank 20R, and the fuel supply pipe 30 is a fuel supply port formed at the bottom of the second fuel tank 20R as much as possible. Since it is configured to be supplied from 30a, the remaining amount of fuel can be reduced.

前記第１燃料タンク２０Ｌと第２燃料タンク２０Ｒの上部をブリーザ連結管３３で接続し、一方の燃料タンク（図例では容量の大きい第２燃料タンク２０）又は両方の燃料タンクに上端部を大気に開放する細径のブリーザ管３４を設ける。 The upper part of the first fuel tank 20L and the second fuel tank 20R is connected by a breather connecting pipe 33, and the upper end is connected to one fuel tank (the second fuel tank 20 having a large capacity in the figure) or both fuel tanks. A small-diameter breather tube 34 that opens to the air is provided.

燃料供給管３０を接続した前記第２燃料タンク２０Ｒ側に、燃料センサ３５を配置する。燃料センサ３５の形態は公知の形態の何れでも良く、例えばストロークセンサを採用するが、走行車体１が傾斜しても液面変動の比較的小さい箇所を選択設定するとよい。 The fuel sensor 35 is arranged on the second fuel tank 20R side to which the fuel supply pipe 30 is connected. The form of the fuel sensor 35 may be any known form. For example, a stroke sensor is adopted, but it is preferable to select and set a portion where the liquid level fluctuation is relatively small even if the traveling vehicle body 1 is tilted.

第１燃料タンク２０Ｌ及び第２燃料タンク２０Ｒの各延長部２０Ｌｂ，２０Ｒｂは、段差状に形成されて昇降ステップ３８Ｌ，３８Ｒの支持部を構成するものである。すなわち、前記のように、ミッションケース３から左右に張り出し状態にキャビン支持ブラケット３９Ｌ，３９Ｒと補助ブラケット４０Ｌ，４０Ｒを設けるが、これらブラケットの先端側に鉄板製で２段に構成される昇降ステップ３８Ｌ，３８Ｒを支持してなる。下段のステップ３８Ｌ，３８Ｒを配置するため、第１，第２燃料タンク２０Ｌ，２０Ｒの延長部２０Ｌｂ，２０Ｒｂに段差支持部を形成している。なお、キャビン支持ブラケット３９Ｌ，３９Ｒと補助ブラケット４０Ｌ，４０Ｒとは燃料タンク２０Ｌ，２０Ｒの支持構成を兼用している。 The extension portions 20Lb and 20Rb of the first fuel tank 20L and the second fuel tank 20R are formed in a stepped shape to form the support portions of the elevating steps 38L and 38R. That is, as described above, the cabin support brackets 39L and 39R and the auxiliary brackets 40L and 40R are provided so as to project from the mission case 3 to the left and right. , 38R is supported. In order to arrange the lower steps 38L and 38R, step support portions are formed in the extension portions 20Lb and 20Rb of the first and second fuel tanks 20L and 20R. The cabin support brackets 39L and 39R and the auxiliary brackets 40L and 40R also have a support configuration for the fuel tanks 20L and 20R.

なお、図中符号４１は燃料供給管３０の途中に介在する燃料フィルタ、符号４２はＳＣＲシステム、符号４３は工具箱を示す。 In the figure, reference numeral 41 indicates a fuel filter interposed in the middle of the fuel supply pipe 30, reference numeral 42 indicates an SCR system, and reference numeral 43 indicates a tool box.

１ 走行車体
３ ミッションケース
２０Ｌ 第１燃料タンク
２０Ｒ 第２燃料タンク
２０ａ 給油口
３０ａ 燃料供給口
３１ 連通管
３１ｄ 分岐管部
３１Ａ 接続部
３１Ｂ 接続部
３１Ｃ 接続部
３２ 逆止弁
Ｅ エンジン
1 Traveling vehicle body 3 Mission case 20L 1st fuel tank 20R 2nd fuel tank 20a Refueling port 30a Fuel supply port 31 Communication pipe 31d Branch pipe 31A Connection 31B Connection 31C Connection 32 Check valve E Engine

Claims (2)

走行車体（１）にエンジン（Ｅ）を搭載し、前記走行車体（１）を構成するミッションケース（３）の左右側に、給油口（２０ａ）を設けた第１燃料タンク（２０Ｌ）と前記エンジン（Ｅ）への燃料供給口（３０ａ）を有する第２燃料タンク（２０Ｒ）を備え、一端を前記第１燃料タンク（２０Ｌ）に接続した連通管（３１）の他端と前記連通管（３１）を分岐する分岐管部（３１ｄ）とを前記第２燃料タンク（２０Ｒ）に接続し、前記連通管（３１）には、前記分岐管部（３１ｄ）への分岐部と前記第２燃料タンク（２０Ｒ）との間に逆止弁（３２）を配置し、前記第１燃料タンク（２０Ｌ）の接続部（３１Ａ）から前記第２燃料タンク（２０Ｒ）の前記連通管（３１）との接続部（３１Ｂ）側への燃料流通を許容するが前記第２燃料タンク（２０Ｒ）の前記連通管（３１）との前記接続部（３１Ｂ）から前記第１燃料タンク（２０Ｌ）の前記接続部（３１Ａ）側への逆流を阻止する構成とした作業車両。 A first fuel tank (20L) in which an engine (E) is mounted on a traveling vehicle body (1) and fuel filler ports (20a) are provided on the left and right sides of a mission case (3) constituting the traveling vehicle body (1) and the above. The other end of the communication pipe (31) having a second fuel tank (20R) having a fuel supply port (30a) to the engine (E) and one end connected to the first fuel tank (20L) and the communication pipe ( The branch pipe portion (31d) that branches 31) is connected to the second fuel tank (20R), and the communication pipe (31) has a branch portion to the branch pipe portion (31d) and the second fuel. A check valve (32) is arranged between the tank (20R) and the connection portion (31A) of the first fuel tank (20L) to the communication pipe (31) of the second fuel tank (20R). Although fuel flow to the connection portion (31B) side is permitted, the connection portion from the connection portion (31B) to the communication pipe (31) of the second fuel tank (20R) to the connection portion of the first fuel tank (20L). A work vehicle configured to prevent backflow to the (31A) side. 前記第１燃料タンク（２０Ｌ）の底面を前記第２燃料タンク（２０Ｒ）の底面より高く設け、前記連結管（３１）の前記第２燃料タンク（２０Ｒ）との前記接続部（３１Ｂ）よりも上位置に前記分岐管部（３１ｄ）の前記第２燃料タンク（２０Ｒ）への接続部（３１Ｃ）を配置した請求項１に記載の作業車両。 The bottom surface of the first fuel tank (20L) is provided higher than the bottom surface of the second fuel tank (20R) so as to be higher than the connection portion (31B) of the connecting pipe (31) with the second fuel tank (20R). The work vehicle according to claim 1, wherein a connection portion (31C) of the branch pipe portion (31d) to the second fuel tank (20R) is arranged at an upper position.
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