200426303 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一種燃料喷射裝置，其通過燃料泵將燃料 箱内的燃料的壓力上升，將該升壓的燃料通過燃料噴射閥 供應給内燃機，其中，本發明特別是關於適合安裝在機車， 小型貨車，船外機，通用機等上的燃料噴射裝置之燃料管。 【先前技術】 下面通過圖4說明現有的燃料噴射裝置之燃料管。 元件符號1 0表示在内部由進氣通路1 1貫通側方所穿設 的節流閥體，該進氣通路1 1，由蝶形的節流閥1 3而實現 開閉，該節流閥1 3安裝在可旋轉地支承於節流閥體1 0上 的節流閥桿1 2上，該節流閥桿1 2由駕駛者操作。 另外，空氣淨化器A連接在進氣通路1 1的上游側（圖 中的右側），進氣管K連接在進氣通路1 1的下游側（圖中 的左側），此外，進氣管K的下游側與内燃機E連接。 而且，空氣係通過空氣淨化器A、節流閥體1 0，進氣管 K朝向内燃機E流動，其空氣量由節流閥1 3控制。 1 3表示燃料管，在其内部穿設有朝向重力方向的下方開 口的燃料流路1 4。 此外，在該燃料流路1 4的重力方向的上方位置連接燃 料導入管1 5，其開口部1 5 A在燃料流路1 4的内部開口。 上述燃料管1 3係由通過小螺釘1 6固定配通於從進氣管 K向上方突出的安裝凸部K1上的支板17夾持而定位固定。200426303 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a fuel injection device that raises the pressure of fuel in a fuel tank through a fuel pump, and supplies the boosted fuel to an internal combustion engine through a fuel injection valve. Among them, the present invention particularly relates to a fuel pipe suitable for a fuel injection device mounted on a locomotive, a minivan, an outboard engine, a general-purpose engine, or the like. [Prior Art] A fuel pipe of a conventional fuel injection device will be described below with reference to FIG. 4. The reference numeral 10 designates a throttle body penetrating through the intake passage 11 inside. The intake passage 11 is opened and closed by a butterfly throttle 13. The throttle 1 3 is mounted on a throttle lever 12 rotatably supported on a throttle body 10, and the throttle lever 12 is operated by a driver. The air cleaner A is connected to the upstream side (right side in the figure) of the intake passage 11 and the intake pipe K is connected to the downstream side (left side in the figure) of the intake passage 11. In addition, the intake pipe K The downstream side is connected to the internal combustion engine E. The air system passes through the air cleaner A and the throttle body 10, the intake pipe K flows toward the internal combustion engine E, and the amount of air is controlled by the throttle valve 13. Reference numeral 13 denotes a fuel pipe, and a fuel flow path 1 4 is formed in the interior thereof so as to open downward in the direction of gravity. A fuel introduction pipe 15 is connected to a position above the fuel flow path 14 in the direction of gravity, and an opening 15 A is opened in the fuel flow path 14. The fuel pipe 13 is positioned and fixed by a support plate 17 fixed to a mounting projection K1 protruding upward from the intake pipe K by a small screw 16.
另一方面，位於燃料喷射閥J上方位置的流入側端部J A 6 3】2/發明說明書(補件)/93-06/93〗06301 200426303 通過0環而插入設置於燃料管1 3的燃料流路1 4的下方開 口内，位於燃料喷射閥J的下方位置的排出側端部JB通過 0環插入設置於在進氣管Κ内開口的噴射閥支承孔Κ 2的内 部。如果採用上述方式，如上面所述，燃料管1 3通過支板 1 7固定配置於進氣管Κ的安裝凸部Κ1上，由此，燃料噴 射閥J由燃料管1 3和進氣管Κ夾持不能脫出，開口於燃料 噴射閥J的流入側端部J Α的頂端的燃料流入孔J C在燃料 流路1 4的下方開口，在排出側端部J B的底端開口的噴射 孔JD朝向進氣管K内開口。 此外，燃料箱T内的燃料，通過例如，電動式的燃料泵 P升壓，該壓力上升的燃料通過燃料配管1 8供向燃料導入 管1 5。 如果採用上述方式，通過空氣淨化器A清潔地過濾的空 氣通過節流閥1 3控制其量，該空氣通過進氣管K供向内燃 機。 另一方面，通過燃料泵P，使燃料箱T内的燃料的壓力 上升，該壓力上升的燃料通過燃料配管1 8，燃料導入管 1 5，供給到燃料管1 3的燃料流路1 4的内部，另外，該燃 料從燃料喷射閥J的燃料流入孔J C，流入到燃料噴射閥J 的内部，經計量的燃料通過噴射孔JD，朝向進氣管K的内 部喷射，與在進氣管K的内部流動的空氣混合，將它們供 向内燃機，由此，進行内燃機的運轉。 【發明内容】 (發明所欲解決之問題） 7 312/發明說明書(補件)/93-06/93106301 200426303 根據上述現有的燃料喷射裝置中採用的燃料管，在外部 溫度較高的狀態連續地使機車等行駛，使内燃機暫時停止 然後再次啟動内燃機時，在（熱間再啟動時）其中，具有 在内燃機的平滑的再次啟動，或在内燃機剛啟動後變得行 駛不正常的情況。 第一原因在於：燃料配管1 8，燃料導入管1 5，燃料管 1 3等的燃料供給内的燃料溫度大大上升。 即，其原因在於：就機車等的内燃機直接地露出的機械 來說，燃料配管1 8，燃料導入管1 5，燃料管1 3在内燃機 停止後，容易直接受到來自内燃機的放熱的影響上述配管 1 8，1 5，1 3直接曝露於大氣中，容易曝露於外部氣體溫度、 直射日光的環境下。 第二原因在於：燃料配管1 8，燃料導入管1 5，燃料管 1 3在封閉狀態，與燃料喷射閥J連接。 即，根據上面說明，在内燃機停止後，燃料配管1 8，燃 料導入管1 5，燃料管1 3内的燃料溫度大大上升，由此， 在上述管1 8，1 5，1 3的内部生成由燃料蒸發產生的蒸汽。 另一方面，如上所述，由於燃料配管1 8，燃料導入管 1 5，燃料管1 3處於封閉狀態，故上述蒸汽不從上述配管 1 8，1 5，1 3，朝向外部排出，而滯留於上述配管的内部。 此外，在上述的狀態，如果進行内燃機的再啟動操作， 或内燃機剛啟動後的行駛，則由於燃料中包含的蒸汽的作 用，燃料壓力降低，或朝向内燃機排出的喷出燃料量進一 步以間歇方式供給，由此，發生内燃機的啟動性劣化，或 8 312/發明說明書(補件)/93-06/93106301 200426303 剛啟動後的行駛不正常。 本發明是針對上述不適合情況而作出發明，本發 的在於提供一種燃料喷射裝置之燃料管，其可提高 使機車等行駛後的熱再啟動時的再啟動性，並且可 啟動後的良好的行駛性能。 (解決問題之手段） 為了實現上述目的，本發明的燃料喷射裝置之燃 在該燃料喷射裝置中，通過燃料泵，使燃料箱内的 壓力上升，通過燃料喷射閥，將壓力上升的燃料向 喷射供給，其第一特徵在於：其内部具有燃料流路 配置於固定構件上的燃料管，係將燃料噴射閥的流 部插入重力方向的下方，燃料喷射閥的燃料流入孔 口於燃料流路處，同時在較上述燃料流入孔處於重 的上方位置的燃料流路内，連接開口有燃料泵連接 導入管的開口部，此外，在較上述燃料導入管的開 於重力方向的上方位置的燃料流路的内部，開口有 連通的大氣開放通路，在上述大氣開放通路中，設 過手動操作實現大氣開放通路的開閉的常閉型的開 另外，在本發明的第一特徵之上，其第二特徵在 插入燃料噴射閥的流入側端部的燃料流路的縱向軸 大氣開放通路的縱向軸心線設置於同一直線上，同 燃料流路的燃料導入管的縱向軸心線與燃料流路交 此外，本發明，在燃料喷射裝置中，通過燃料泵 料箱内的燃料的壓力上升，通過多個燃料喷射閥， 312/發明說明書(補件)/93-06/93106301 明的目 連續地 獲得剛 料管， 燃料的 内燃機 ，固定 入側端 連接開 力方向 的燃料 口部處 與大氣 置有通 閉閥。 於：將 心線和 時朝向 叉。 ，使燃 將壓力 200426303 上升的燃料向内燃機喷射供給，其第三特徵在於：其内部 具有大致沿水平方向的燃料流路，固定配置於固定構件上 的燃料管，係得各燃料噴射閥的流入側端部插入其重力方 向的下方，各燃料噴射閥的燃料流入孔連接開口於燃料流 路處，同時在上述燃料流路的一側上，連接開口有與燃料 泵連設的燃料導入管的開口部，此外，在上述燃料流路的 另一側，且較各燃料噴射閥的燃料流入孔處於重力方向的 上方位置的燃料流路的内開口有與大氣連通的大氣開放通 路，在上述大氣開放通路中，設置有常閉型的開閉閥，該 開閉閥通過手動操作，實現大氣開放通路的開閉。 (作用） 根據本發明的第一特徵，如果在内燃機啟動時，通過駕 駛者，進行啟動操作，則使燃料泵與該啟動操作同步地驅 動，使燃料配管，燃料導入管，燃料管内的燃料壓力上升。 此時，通過駕駛者，以手動方式對開閉閥進行操作，打開 大氣開放通路，此時，由於燃料泵壓力上升，保持於配管 内的燃料以一定壓力從大氣開放通路，朝向大氣排出，在 排出該燃料的同時，滯留於配管内的蒸汽也同時地朝向配 管外面排出。 此時，由於在燃料管的燃料流路的最上方位置，大氣開 放通路開口 ，故可確實將配管内的蒸汽朝向外部排出，由 此，可提高熱間再啟動和内燃機剛啟動後的行駛性能。 此外，根據本發明的第二特徵，由於插入燃料喷射閥的 流入側端部的燃料流路的縱向軸心線與大氣開放通路的縱 10 312/發明說明書(補件)/93-06/93106301 200426303 向軸心線設置於同一直線上，故比重小於燃料的 實朝向與燃料噴射閥離開的一側排出。如果對應 燃料導入管的縱向軸心線與燃料流路交叉，則從 燃料導入管，朝向燃料流路内進入的蒸汽可與燃 側壁碰撞，對蒸汽進行細微處理，故可提高蒸汽 開放通路的排出性。 另外，根據本發明的第三特徵，在燃料管中， 燃料喷射閥，在此情況下，蒸汽與在燃料管的燃 内部從一側朝向另一側流動的燃料一起流動，此 平方向設置的燃料流路内的重力方向的上方位置 收斂的同時實現流動。 另一方面，由於大氣開放通路位於燃料喷射閥 入孔的重力方向的上方位置，並且開口於燃料管 側，可將蒸汽與從一側朝向另一側的燃料流一起 效地從大氣開放通路朝向大氣側排出。 【實施方式】 (實施例） 下面通過圖1對本發明的燃料噴射裝置之燃料 實施例進行說明。本實施例為相對内燃機具有單 喷射閥的燃料噴射裝置，與圖4相同的部分採用 符號省略對其的說明。 在燃料管1在内部沿上下方向開’設有燃料流路 流路2的重力方向的下方朝向燃料管1的底端1 / 另外，在燃料流路2的中間部，開設有與燃料 312/發明說明書(補件)/93-06/93106301 蒸汽可確 該情況， 燃料管， 料流路的 相對大氣 安裝多個 料流路的 時，沿水 ，蒸汽在 的燃料流 的另一 ，更加有 管的一個 一的燃料 同一元件 2，燃料 〖開口 。 泵P連接 11 200426303 的燃料導入管1 5的開口部1 5 A，燃料流路2的重力方向的 上方通過大氣開放通路3而朝向大氣開口。 換言之，燃料流路2的下方開口於燃料管1的底端1 A， 與燃料流路2連通的大氣開放通路3的上方開口於燃料管 1的頂端1 B上，燃料導入管1 5與燃料管1的中間部連接， 燃料導入管1 5的開口部1 5 A連接開口於燃料流路2的中間 部。 此外，在大氣開放通路3上，設置有平時關閉型的開閉 閥4 〇 下面通過圖2，對開閉閥4進行說明，5表示閥座體， 在其中心部，根據沿上下方向貫通開設有開放孔5 A，在該 開放孔5 A的底端形成有與下方面對的閥座5 B。 另外，6為開閉閥座5B與閥座5B面對配置的闊體，由 閥體5 B向上方延伸的操作桿5 C通過閥座體5的開放孔5 A 内，由閥座體5向上方突出。 該閥體6通過彈簧7的彈力按壓配置於閥座5B上，具 體來說，彈簧7的底端與開放孔5 A的下方臺階部5 D繫止， 其頂端與嵌合於操作桿5C上的墊片5E繫止。 如果採用上述方式，通過彈簧7的彈力，在平時將具有 閥體6的操作桿5 C朝向上方按壓，由此，該閥體6被朝向 閥座5B賦能，閥座5B以通常閉塞方式保持。 開閉閥4依上述方式形成，上述開閉閥4從大氣開放通 路3的上方的開口端以螺合方式設置於大氣開放通路3的 内部，此時，閥座體5的外周與大氣開放通路3的内周之 12 312/發明說明書(補件)/93-06/93106301 200426303 間通過由彈性材料形成的密封環8，以氣密方式保持（上 述的螺合通過形成於閥座體5的上方外周的陽螺紋5 F與形 成於大氣開放通路3的上方内周的陰螺紋3 A而實現。）。 然而，燃料流路2和大氣開放通路3通過閥座體5的外周 部分，以氣密方.式保持，燃料流路2和大氣開放通路3通 過閥座體5的開放孔5A而連接，該開放孔5A在平時由閥 體6封閉（“在平時”指不對閥體6的操作桿5 C施加任何 的外力的狀態）。 再有，具有上述開閉閥4的燃料管1通過支板1 7夾持 而固定，該支板1 7通過小螺釘1 6固定於作為從進氣管K 向上方延伸的固定構件K 1的進氣管K的安裝凸部1 6上。 在將燃料管1固定於固定構件K1上時，燃料喷射閥J 的流入側端部J A以氣密地插入設置於燃料管1的燃料流路 2的下方開口内，燃料喷射閥J的排出側端部JB以氣密地 插入設置於噴射閥支承孔K 2内，由此，可將燃料噴射閥J 夾持於燃料管1和進氣管K之間。 如果再次關注上述方面，燃料管1固定於作為固定構件 K 1的安裝凸部上，燃料噴射閥J夾持於燃料管1和進氣管 K之間。此時，在燃料管1的燃料流路2的重力方向的下 方，以開口方式連接有燃料喷射閥J的燃料流入孔J C，此 外，在上述燃料流入孔的開口的，重力方向的上方的燃料 流路2的内部，開設有燃料導入管1 5的開口部1 5 A，此外， 在上述開口部1 5 A的重力方向的上方位置的燃料流路2 上，開口有大氣開放通路3。 13 312/發明說明書(補件)/93-06/93106301 200426303 如果採用具有上述燃料管的燃料噴射裝置，則可如内燃 機的熱間再啟動，良好地進行以較大程度對燃料供給系統 内的燃料進行加熱的狀態的内燃機的再次啟動。 下面對此進行說明，駕駛者首先進行啟動操作，由此， 電動式的燃料泵p，火星塞等的電路處於通電狀態，驅動 燃料泵P，吸入燃料箱T内部的燃料，升壓，將該壓力上 升的燃料供給到燃料導入管1 5，供給到燃料管1的内部的 燃料流路2的内部，使上述燃料配管内的燃料壓力上升。 另一方面，在對上述燃料配管（燃料導入管1 5，燃料管 1 )内的燃料以較大程度加熱的狀態，在上述燃料配管的内 部，產生蒸汽並存在蒸汽，由於存在有該蒸汽，無法通過 燃料噴射閥J，將所需的燃料供向進氣管K。 此外，無法連續地供給燃料。由於有該情況，難於再次 實現内燃機的熱啟動。在上述的狀態，駕駛者通過手動方 式，將開閉閥4朝向下方按壓，抵抗彈簧7的彈力，使閥 體6與閥座5 B離開，以敞開方式保持大氣開放通路3。如 果將該大氣開放通路3打開，則可將燃料導入管1 5和燃料 管1的燃料流路2内部的升壓保持的燃料一下子從大氣開 放通路3朝向外部排出，其比重比燃料輕的蒸汽與上述燃 料流一起一下子從大氣開放通路3朝向外部排出，可將燃 料導入管1 5，燃料流路2内的蒸汽排出。 於是，如果駕駛者再次進行内燃機的啟動操作，則僅僅 在燃料泵P的作用下實現升壓的，不存在蒸汽的所需的燃 料連續地由燃料喷射閥J，向進氣管K的内部噴射供給， 14 312/發明說明書(補件)/93-06/93106301 200426303 於是，可確實進行内燃機的熱再啟動。 另外，由於在内燃機的再次啟動後，可通過將蒸汽主動 地朝向外部排出，連續地將正確的燃料供向内燃機，故可 獲得剛啟動後的穩定的行駛性能。 再有，如果採用具有上述燃料管1的燃料喷射裝置，則 在長期地放置内燃機後，啟動時，可確實將内燃機啟動。 即，在内燃機的長期的放置（長期地不使用内燃機）的狀 態，燃料導入管1 5，燃料流路2内的燃料性能大大劣化， 内燃機的點火性顯著降低。 在上述狀態中内燃機的啟動時，啟動操作進行與熱間再 啟動時相同的啟動操作。 如果如上述這樣，可通過大氣開放通路3，將上述性能 劣化的燃料朝向外部排出，通過燃料噴射閥J，將新的燃 料供向内燃機E，即使在長期放置後的情況下，仍進行可 靠的内燃機的啟動。 在此，就本發明的燃料管1的蒸汽的排出來說，應注意 到的是在燃料流路2的重力方向的更下方位置，開設燃料 噴射閥J的燃料流入孔J C，另外，在上述燃料流入孔J C 的上方的燃料流路2中，開設燃料導入管1 5的開口部 1 5 A，此外，大氣開放通路3開口於燃料流路3的重力方向 的最上方位置。 如果採用上述方式，則從燃料導入管1 5的開口部1 5 A， 流入到燃料流路2的内部的蒸汽在流入燃料流路2的内部 之後，馬上朝向位於上方位置的大氣開放通路3收斂，另 15 312/發明說明書(補件)/93-06/93106301 200426303 外，位於燃料流路2内的蒸汽也朝向位於上方位置的大氣 開放通路3收斂。 於是，通過手動方式對開閉閥4進行操作，將大氣開放 通路3敞開，將收斂於大氣開放通路3的附近的蒸汽馬上 朝向大氣開放。 另外，如果使燃料噴射閥J的燃料流入孔J C開口於燃 料流路2的重力方向的最下方位置，則抑制蒸汽通過上述 燃料流入孔J C，進入燃料噴射閥J的内部。 其原因在於：由於蒸汽本身所具有的浮力的作用，蒸汽 朝向上方移動，朝向離開燃料流入孔J C的一側移動。 此外，如果插入支承燃料噴射閥J的流入側端部J A的 下方的燃料流路2的縱向軸心線X — X和大氣開放通路3 的縱向軸心線Y — Y設置於大致同一直線上，朝向燃料流路 2的燃料導入管1 5的縱向軸心線Z — Z與樂：料流路2交叉 (在此“交叉”指燃料導入管1 5的開口1 5 A與燃料流路 2的側壁對向），則可更加有效地阻止蒸汽流入到燃料噴射 閥J的内部。即，在通過開閉閥4，開放大氣開放通路3， 在大氣開放通路3中流動的燃料流與朝向燃料噴射閥J的 燃料流入孔J C的燃料流反向。 另外，從燃料導入管1 5的開口部1 5 A，朝向燃料流路2 内流入的燃料與燃料流路2的側壁碰撞，由此，則可以更 加細微的尺寸將蒸汽粉碎，可在朝向大氣開放通路3的燃 料流中，混入該細微的蒸汽，可進一步提高蒸汽從大氣開 放通路3的排出性。 16 312/發明說明書(補件)/93-06/93106301 200426303 再有，對於開閉閥4的結構並不限於實施例，可為能夠 通過手動操作，實現通路的開閉的類型。 下面通過圖3，對本發明的其他實施例進行說明。 本實施例係具有多個燃料喷射閥J。 2 0表示在内部開設有水平方向的燃料流路2 1的燃料 管，燃料流路2 1的一側方W的開口由燃料導入管2 2封閉， 該燃料導入管2 2與燃料泵（圖中未示出）連通。該燃料導 入管2 2通過開口部2 2 A，開口於燃料流路2 1的内部。 另外，在燃料流路21的重力方向的下方開設有多個噴 射閥支承孔2 1 A，喷射閥支承孔2 1 A的重力方向的上方開 口於燃料流路2 1的重力方向的下方，喷射閥支承孔2 1A 的重力方向的下方朝向下方開口 。在本實施例中，開設有 3個噴射閥支承孔2 1 A。 此外，2 2表示大氣開放通路，其一端開口於燃料流路 2 1的重力方向的上方，另一端朝向大氣開口。 即，大氣開放通路2 2中的相對燃料流路21的開口位 置，係處於噴射閥支承孔2 1 A中的相對燃料流路2 1的開口 位置的重力方向的上方位置。 2 3表示作為實現大氣開放通路2 2的開閉的手動操作型 的，常閉型的開閉閥，在非操作狀態，該開閉閥2 3保持大 氣開放通路2 2封閉。 即，在開閉閥2 3中，在非操作狀態，閥體2 3 A在彈簧 2 4的彈力的作用下，將大氣開放通路2 2的閥座2 2 A封閉， 在操作狀態，該閥體2 3 A抵抗彈簧2 4的彈力而開放。 17 312/發明說明書(補件)/93-06/93106301 200426303 2 5表示節流閥體，在其内部，以貫通方式開設有進氣通 路1 1，進氣通路1 1通過節流闊1 3而實現開閉，該節流閥 1 3安裝於可旋轉地支承於節流閥體2 5上的節流閥桿1 2 上。 在本實施例中，開設有3個進氣通路1 1，各進氣通路通 過相應的節流閥1 3而實現開閉。 另外，在節流閥體2 5的各進氣通路1 1上，朝向上方， 開設有噴射閥支承孔2 5 A。 再有，燃料管2 0通過螺栓固定於節流閥體2 5的固定構 件2 5 B上，此時，燃料喷射閥J的流入側端部J A通過0 環，氣密地插入設置於燃料管2 0的噴射閥支承孔2 1 A中， 該燃料喷射閥J的排出側端部J B通過0環，氣密地插入設 置於節流閥體2 5的噴射閥支承孔2 5 A的内部。 即，各燃料噴射閥J以不可脫出的方式夾持於燃料管20 和節流閥體2 5之間。另外，多個燃料噴射閥J也可與第一 實施例相同，夾持於燃料管與進氣管之間。 如果採用上述方式，各燃料噴射閥J的燃料流入孔JC 開口於燃料管2 0的燃料流路2 1的重力方向的下方位置， 大氣開放孔2 2開口於燃料流入孔J C的，重力方向的上方 的燃料流路21中，此外，燃料導入管2 2的開口部2 2 A與 燃料流路2 1的一側方W連接而開口 ，上述大氣開放孔2 2 位於燃料流路2 1的另一側方R。 如果採用具有上述多個燃料噴射閥J的本發明的燃料 管，則可良好地進行熱間再啟動。 18 312/發明說明書(補件)/93-06/93106301 200426303 其原因在於：在内燃機的啟動時，可通過手動方式對開 閉閥2 3進行操作，將大氣開放通路2 2打開，通過大氣開 放通路2 2，將燃料管2 0的燃料流路2 1内的蒸汽排到外部。 特別是，在本實施例中應注意到，燃料管的燃料流路2 1 基本沿水平方向設置，燃料導入管2 2與燃料流路2 1的一 側方W連接，在燃料流路2 1的重力方向的下方，開設有各 燃料噴射閥J的燃料流入孔J C，此外，具有開閉閥2 3的 大氣開放通路2 2在燃料流路21的另一側方R，並且開口 於燃料流入孔J C的開口位置的重力方向的上方的燃料流 路21的内部。 如果採用上述方式，在對開閉閥2 3進行操作，打開大 氣開放通路2 2時，燃料流路21内的燃料以良好的勢能從 一側方W (圖中的右側），朝向另一側方R (圖中的左側） 流動，如果如這樣，滯留於燃料導入管2 2和燃料流路2 1 的内部的蒸汽與朝向左方而流動的燃料一起，朝向大氣開 放通路2 2的開口流動。 另一方面，上述蒸汽因本身所具有的浮力，收斂於燃料 流路2 1内的上方位置。 然而，蒸汽朝向燃料流路2 1的上方收斂，同時與在燃 料流路2 1的内部朝向左方流動的燃料一起，朝向大氣開放 通路22的開口而收斂，該蒸汽通過大氣開放通路22，有 效地排出。 此外，由於即使在長期地放置内燃機後，啟動内燃機時 的情況下，與蒸汽相同地仍可排出性能劣化的燃料，故可 19 312/發明說明書(補件)/93-06/93106301 200426303 提高放置後的啟動性。 (發明效果） 如上面所述，如果採用本發明的燃料噴射裝置的燃料 管，由於在於其内部具有燃料流路，固定於固定構件上的 燃料管中，燃料喷射閥的流入側端部插入其重力方向的下 方，燃料噴射閥的燃料流入孔連接開口於燃料流路處，並 且在上述燃料流入孔的重力方向的上方位置的燃料流路的 内部，連接開口有與燃料泵連接的燃料導入管的開口部， 此外，在上述燃料導入管的開口部的重力方向的上方位置 的燃料流路的内部，開口有與大氣連通的大氣開放通路， 在上述大氣開放通路中，設置有常閉型的開閉閥，該開閉 閥通過手動操作，實現大氣開放通路的開閉，故在熱間再 啟動時打開開閉閥，可將滯留於燃料導入管和燃料管的燃 料流路内的蒸汽，通過大氣開放通路，朝向外部有效地排 出，由此，可提高熱間再啟動性，並且提高長期放置内燃 機後的内燃機的啟動性和剛啟動後的運轉性。 此外，如果插入燃料喷射閥的流入側端部的的燃料流路 的縱向軸心線和大氣開放通路的縱向軸心線設置於同一直 線上，並且朝向燃料流路的燃料導入管的縱向軸心線與燃 料流路交叉，則可進一步提高蒸汽從大氣開放通路的排出 性，並且可更進一步地阻止蒸汽進入燃料喷射閥的内部， 可進一步提高熱間再啟動性和長期放置後的内燃機的啟動 性。 在於其内部具有大致沿水平方向的燃料流路，固定於固 20 312/發明說明書(補件)/93-06/93106301 200426303 定構件上的燃料管中，各燃料喷射閥的流入側端部插入其 重力方向的下方，各燃料喷射閥的燃料流入孔連接開口於 燃料流路處，並且在上述燃料流路的一側，連接開口有與 燃料泵連接的燃料導入管的開口部，此外，在上述燃料流 路的另一側，並且各燃料噴射閥的燃料流入孔的重力方向 的上方位置的燃料流路内，開口有與大氣連通的大氣開放 通路，在上述大氣開放通路中，設置有常閉型的開閉閥， 該開閉閥通過手動操作，實現大氣開放通路的開閉，具有 多個燃料喷射閥的燃料噴射裝置中可實現上述效果。 【圖式簡單說明】 圖1為表示本發明的燃料噴射裝置的燃料管的第一實施 例的主要部分的縱向剖視圖。 圖2為圖1所採用的開閉閥的放大剖視圖。 圖3為表示本發明的燃料喷射裝置的燃料管的第二實施 例的主要部分的縱向剖視圖。 圖4為現有的燃料喷射裝置的燃料管的主要部分的剖視 圖。 (元件符號說明） A 空氣淨化器 E 内燃機 J 燃料喷射閥 J A 流入側端部 J B 排出側端部 J C 燃料流入孔 21 312/發明說明書(補件)/93-06/93106301 200426303 JD 喷 射 孔 K 進 氣 管 K1 安 裝 凸 部 K2 噴 射 闊 支 承 孔 P 燃 料 泵 壓 丁 燃 料 箱 1 燃 料 管 1 A 底 端 1B 頂 端 2 燃 料 流 路 3 大 氣 開 放 通 路 3A 陰 螺 紋 4 開 閉 閥 5 閥 座 體 5A 開 放 孔 5B 閥 座 5C 操 作 桿 5D 下 方 臺 階 部 5E 墊 片 6 閥 體 7 彈 簧 8 密 封 環 10 Λ/τ 即 流 閥 體 11 内 部 進 氣 通 路 12 ArAr 即 流 閥 桿 22 312/發明說明書(補件)/93-06/93106301 200426303 13 々/Γ 流 閥 14 燃 料 流 路 15 燃 料 導 入 管 1 5A 開 口 部 16 小 螺 釘 17 支 板 18 燃 料 通 過 燃 料配管 20 燃 料 管 21 燃 料 流 路 22 燃 料 導 入 管 22A 開 σ 部 23 開 閉 閥 23A 閥 體 24 彈 簧 25 節 流 閥 體 25A 噴 射 閥 支 承 孔 25B 固 定 構 件On the other hand, the inflow-side end portion JA 6 3 located above the fuel injection valve J] 2 / Invention (Supplement) / 93-06 / 93〗 06301 200426303 The fuel provided in the fuel pipe 1 3 is inserted through the 0 ring In the lower opening of the flow path 14, a discharge-side end portion JB located below the fuel injection valve J is inserted into the injection valve support hole K2 provided in the intake pipe K through a 0 ring. If the above-mentioned method is adopted, as described above, the fuel pipe 13 is fixedly arranged on the mounting convex portion K1 of the intake pipe K through the support plate 17. Therefore, the fuel injection valve J is composed of the fuel pipe 13 and the intake pipe K. The fuel inflow hole JC opened at the top end of the inflow side end portion J A of the fuel injection valve J is opened below the fuel flow path 14 and the injection hole JD is opened at the bottom end of the discharge side end portion JB. Opens into the intake pipe K. The fuel in the fuel tank T is boosted by, for example, an electric fuel pump P, and the fuel having the increased pressure is supplied to the fuel introduction pipe 15 through a fuel pipe 18. If the above method is adopted, the amount of air cleanly filtered by the air cleaner A is controlled by the throttle valve 13 and the air is supplied to the internal combustion engine through the intake pipe K. On the other hand, the fuel pump P raises the pressure of the fuel in the fuel tank T, and the fuel having the increased pressure passes through the fuel pipe 18, the fuel introduction pipe 15 and the fuel flow path 14 supplied to the fuel pipe 13 Inside, in addition, the fuel flows from the fuel inflow hole JC of the fuel injection valve J into the inside of the fuel injection valve J, and the metered fuel passes through the injection hole JD and is injected toward the inside of the intake pipe K. The internally flowing air is mixed and supplied to the internal combustion engine, thereby operating the internal combustion engine. [Summary of the Invention] (Problems to be Solved by the Invention) 7 312 / Invention Specification (Supplement) / 93-06 / 93106301 200426303 According to the fuel pipe used in the above-mentioned conventional fuel injection device, the external temperature is continuously high. When a locomotive or the like is driven, the internal combustion engine is temporarily stopped, and the internal combustion engine is restarted, there may be a case where the internal combustion engine is restarted smoothly after the internal combustion engine is restarted, or the internal combustion engine becomes abnormal immediately after the internal combustion engine is started. The first reason is that the fuel temperature in the fuel supply such as the fuel piping 18, the fuel introduction pipe 15 and the fuel pipe 13 has greatly increased. That is, the reason is that, for a machine in which an internal combustion engine such as a locomotive is directly exposed, the fuel pipe 18, the fuel introduction pipe 15 and the fuel pipe 13 are susceptible to being directly affected by the heat radiation from the internal combustion engine after the engine is stopped. 18, 15, 5, and 3 are directly exposed to the atmosphere, and easily exposed to the environment of external air temperature and direct sunlight. The second reason is that the fuel pipe 18, the fuel introduction pipe 15 and the fuel pipe 13 are closed and connected to the fuel injection valve J. That is, according to the above description, after the internal combustion engine is stopped, the fuel temperature in the fuel pipe 18, the fuel introduction pipe 15 and the fuel pipe 13 rises greatly, thereby generating inside the pipes 18, 15 and 13 Vapor produced by the evaporation of fuel. On the other hand, as described above, since the fuel pipes 18, the fuel introduction pipes 15 and the fuel pipes 13 are in a closed state, the steam is not discharged from the pipes 18, 15, 15, and 13 to the outside, but remains. Inside the piping. In addition, in the above-mentioned state, if a restart operation of the internal combustion engine is performed, or the driving immediately after the internal combustion engine is started, the fuel pressure is reduced due to the action of steam contained in the fuel, or the amount of the fuel ejected toward the internal combustion engine is further intermittent. Supply, as a result, deterioration of the startability of the internal combustion engine, or 8 312 / Invention Specification (Supplement) / 93-06 / 93106301 200426303 The driving immediately after the start is abnormal. The present invention has been made in view of the above-mentioned unsuitability. The present invention is to provide a fuel pipe of a fuel injection device, which can improve restartability during hot restart after driving a locomotive and the like, and can perform good driving after starting. performance. (Means for Solving the Problems) In order to achieve the above object, the fuel injection device of the present invention is provided with a fuel injection device in which a pressure in a fuel tank is increased by a fuel pump, and a fuel injection valve is used to inject the pressure-increased fuel toward the fuel injection device. The first feature of the supply is that it has a fuel pipe with a fuel flow path arranged on the fixed member. The flow part of the fuel injection valve is inserted below the direction of gravity. The fuel inflow port of the fuel injection valve is at the fuel flow path. At the same time, in the fuel flow path that is heavier than the fuel inflow hole, an opening portion of the fuel pump connection introduction pipe is connected to the opening. In addition, the fuel flow in the gravity position above the fuel introduction pipe is opened in the gravity direction. Inside the road, there is a connected atmospheric open passage opening. In the above-mentioned atmospheric open passage, a normally closed type opening which manually opens and closes the atmospheric open passage is provided. In addition to the first feature of the present invention, the second feature is It is provided on the longitudinal axis line of the atmospheric open path of the longitudinal axis of the fuel flow path inserted into the inflow side end of the fuel injection valve On the same straight line, the longitudinal axis line of the fuel introduction pipe of the same fuel flow path intersects the fuel flow path. In addition, in the present invention, in the fuel injection device, the pressure of the fuel in the fuel pump tank rises, and a plurality of fuel passes Injection valve, 312 / Invention Specification (Supplement) / 93-06 / 93106301 Obtain continuous rigid tube, fuel internal combustion engine for the purpose of clearing, and the fuel inlet at the fixed end side connected to the opening direction is open and closed to the atmosphere. valve. Yu: Turn the heart line and time toward the fork. The third feature is that the fuel that fuels the increased pressure 200426303 is injected into the internal combustion engine. It has a fuel flow path substantially horizontal in the interior, and the fuel pipe fixed on the fixed member is fixed to enable the inflow of each fuel injection valve. The side end portion is inserted downward in the direction of gravity, and the fuel inflow hole of each fuel injection valve is connected to the fuel flow path. At the same time, on one side of the fuel flow path, there is a fuel inlet pipe connected to the fuel pump. The opening portion has an air opening on the other side of the fuel flow path, which is located above the fuel inflow hole of each fuel injection valve in the gravity direction, and has an atmosphere open passage communicating with the atmosphere. The open path is provided with a normally-closed on-off valve, and the on-off valve is manually operated to open and close the atmospheric open path. (Action) According to the first feature of the present invention, if the driver performs a start operation when the internal combustion engine is started, the fuel pump is driven in synchronization with the start operation, and the fuel pipe, the fuel introduction pipe, and the fuel pressure in the fuel pipe are driven. rise. At this time, the driver manually operates the on-off valve to open the atmosphere open passage. At this time, the fuel pump pressure rises, and the fuel held in the pipe is discharged from the atmosphere open passage to the atmosphere at a certain pressure and is discharged. At the same time as the fuel, the steam trapped in the pipe is also discharged toward the outside of the pipe at the same time. At this time, since the atmosphere is open at the uppermost position of the fuel flow path of the fuel pipe, the steam in the piping can be surely discharged to the outside, thereby improving the driving performance after the restart of the hot room and immediately after the internal combustion engine is started. . In addition, according to the second feature of the present invention, the longitudinal axis of the fuel flow path inserted into the inflow side end of the fuel injection valve and the vertical direction of the atmosphere open passage 10 312 / Invention Specification (Supplement) / 93-06 / 93106301 200426303 The axial centerline is set on the same straight line, so the specific gravity is smaller than the actual direction of the fuel and discharged from the side away from the fuel injection valve. If the longitudinal axis of the corresponding fuel introduction pipe intersects the fuel flow path, the steam entering from the fuel introduction pipe toward the fuel flow path can collide with the combustion side wall, and the steam is finely processed, so the discharge of the steam open path can be improved. Sex. In addition, according to a third feature of the present invention, in the fuel pipe, the fuel injection valve, in this case, the steam flows together with the fuel flowing from one side to the other side of the inside of the fuel pipe. The upper position in the direction of gravity in the fuel flow path converges and flows. On the other hand, since the atmosphere opening path is located above the gravity direction of the fuel injection valve inlet and is open on the fuel pipe side, the steam can be efficiently directed from the atmosphere opening path together with the fuel flow from one side to the other. Exhaust from the atmosphere. [Embodiment] (Embodiment) An embodiment of a fuel of a fuel injection device of the present invention will be described below with reference to Fig. 1. This embodiment is a fuel injection device having a single injection valve with respect to an internal combustion engine, and the same parts as those in Fig. 4 are denoted by reference numerals and their descriptions are omitted. The fuel pipe 1 is opened internally in the vertical direction, and the fuel flow path 2 is provided in the gravitational direction. The fuel pipe 1 is provided with a fuel 312 / Specification of the Invention (Supplement) / 93-06 / 93106301 Steam can confirm this situation. When multiple fuel flow paths are installed relative to the atmosphere of the fuel pipe and material flow path, the other fuel flow along water and steam is more One-by-one fuel of the tube is the same element 2 and the fuel is open. The pump P is connected to an opening portion 15 A of the fuel introduction pipe 15 of 20042004303, and the gravity flow direction of the fuel flow path 2 is opened to the atmosphere through the atmosphere open passage 3. In other words, the lower part of the fuel flow path 2 is opened at the bottom end 1 A of the fuel pipe 1, the upper part of the atmospheric open passage 3 communicating with the fuel flow path 2 is opened at the top end 1 B of the fuel pipe 1, and the fuel introduction pipe 15 and the fuel The middle portion of the tube 1 is connected, and the opening portion 15 A of the fuel introduction tube 15 is connected to the middle portion of the fuel flow path 2. In addition, a normally-closed on-off valve 4 is provided on the atmospheric open passage 3. The on-off valve 4 will be described below with reference to FIG. 2. A hole 5 A is formed at the bottom end of the open hole 5 A with a valve seat 5 B facing the lower side. In addition, 6 is a wide body arranged to open and close the valve seat 5B and the valve seat 5B. The operating rod 5 C extending upward from the valve body 5 B passes through the opening 5 A of the valve seat body 5 and upwards from the valve seat body 5. Party highlights. The valve body 6 is arranged on the valve seat 5B by the elastic force of the spring 7. Specifically, the bottom end of the spring 7 is locked with the lower step portion 5D of the opening 5A, and the top end thereof is fitted on the operation lever 5C. The gasket 5E is a stop. If the above-mentioned method is adopted, the operating lever 5 C with the valve body 6 is normally pressed upward by the elastic force of the spring 7, so that the valve body 6 is energized toward the valve seat 5B, and the valve seat 5B is held in a normally closed manner. . The on-off valve 4 is formed in the manner described above, and the on-off valve 4 is screw-fitted from the open end above the atmosphere open passage 3 to the inside of the atmosphere open passage 3. At this time, the outer periphery of the valve seat body 5 and the atmosphere open passage 3 Inner perimeter 12 312 / Invention specification (Supplement) / 93-06 / 93106301 200426303 Airtightly held by a sealing ring 8 formed of an elastic material (the above-mentioned screwing is formed on the upper periphery of the valve seat body 5 5 F and the female thread 3 A formed on the inner periphery above the atmospheric open passage 3.). However, the fuel flow path 2 and the atmosphere open passage 3 are held in an airtight manner through the outer peripheral portion of the valve seat body 5, and the fuel flow path 2 and the atmosphere open passage 3 are connected through the opening 5A of the valve seat body 5. The open hole 5A is closed by the valve body 6 in the normal time ("in normal time" means a state in which no external force is applied to the operation lever 5C of the valve body 6). In addition, the fuel pipe 1 having the on-off valve 4 is clamped and held by a support plate 17 which is fixed to the inlet of a fixing member K1 extending upward from the intake pipe K by a small screw 16. The mounting protrusion 16 of the air pipe K is provided. When the fuel pipe 1 is fixed to the fixing member K1, the inflow-side end portion JA of the fuel injection valve J is hermetically inserted into the opening below the fuel flow path 2 provided in the fuel pipe 1, and the discharge side of the fuel injection valve J The end portion JB is inserted into the injection valve support hole K 2 in an air-tight manner, whereby the fuel injection valve J can be sandwiched between the fuel pipe 1 and the intake pipe K. If attention is again paid to the above aspect, the fuel pipe 1 is fixed to a mounting projection as a fixing member K1, and the fuel injection valve J is sandwiched between the fuel pipe 1 and the intake pipe K. At this time, the fuel inlet hole JC of the fuel injection valve J is openly connected below the gravity direction of the fuel flow path 2 of the fuel pipe 1, and the fuel above the gravity inlet direction of the fuel inlet hole opening is opened. An opening 15 A of a fuel introduction pipe 15 is opened inside the flow path 2. An open air passage 3 is opened in the fuel flow path 2 at a position above the gravity direction of the opening 15 A. 13 312 / Invention Manual (Supplement) / 93-06 / 93106301 200426303 If a fuel injection device having the above-mentioned fuel pipe is used, it can be restarted like a hot room of an internal combustion engine, and the fuel supply system can be performed to a large extent. The internal combustion engine with the fuel heated is restarted. The following explains this. The driver first starts the operation, so that the electric fuel pump p, the spark plug circuit and the like are in an energized state, driving the fuel pump P, sucking the fuel inside the fuel tank T, boosting, and This pressure-increased fuel is supplied to the fuel introduction pipe 15 and supplied to the inside of the fuel flow path 2 inside the fuel pipe 1 to raise the fuel pressure in the fuel pipe. On the other hand, in a state where the fuel in the fuel piping (fuel introduction pipe 15 and fuel pipe 1) is heated to a large extent, steam is generated inside the fuel piping and there is steam. Since the steam exists, The fuel injection valve J cannot be used to supply the required fuel to the intake pipe K. In addition, fuel cannot be continuously supplied. Because of this, it is difficult to achieve a hot start of the internal combustion engine again. In the above state, the driver manually presses the on-off valve 4 downward, resists the elastic force of the spring 7, and separates the valve body 6 and the valve seat 5B to maintain the atmosphere open path 3 in an open manner. If the atmospheric open path 3 is opened, the fuel pressure-maintained fuel in the fuel introduction pipe 15 and the fuel flow path 2 of the fuel pipe 1 can be discharged from the atmospheric open path 3 to the outside at a time, and its specific gravity is lighter than that of the fuel. The steam is discharged from the atmosphere open path 3 to the outside together with the fuel flow, and the fuel introduction pipe 15 and the steam in the fuel flow path 2 can be discharged. Therefore, if the driver performs the start operation of the internal combustion engine again, the fuel required for boosting only under the action of the fuel pump P is continuously injected from the fuel injection valve J into the interior of the intake pipe K without the presence of steam. Supply, 14 312 / Invention Specification (Supplement) / 93-06 / 93106301 200426303 Thus, the hot restart of the internal combustion engine can be surely performed. In addition, since the steam can be actively discharged to the outside after the internal combustion engine is restarted, and the correct fuel can be continuously supplied to the internal combustion engine, stable driving performance immediately after the start can be obtained. In addition, if the fuel injection device having the fuel pipe 1 is used, the internal combustion engine can be surely started when it is started after the internal combustion engine is left for a long period of time. That is, in a state where the internal combustion engine is left for a long time (the internal combustion engine is not used for a long time), the fuel introduction pipe 15 and the fuel performance in the fuel flow path 2 are greatly deteriorated, and the ignitability of the internal combustion engine is significantly reduced. When the internal combustion engine is started in the above state, the start operation is performed in the same manner as when the thermal restart is performed. If it is as described above, the above-mentioned degraded fuel can be discharged to the outside through the open air passage 3, and the new fuel can be supplied to the internal combustion engine E through the fuel injection valve J. Even after long-term storage, it can be reliably performed. Start of the internal combustion engine. Here, it should be noted that in terms of discharging the steam from the fuel pipe 1 of the present invention, the fuel inflow hole JC of the fuel injection valve J is opened at a position further below the gravity direction of the fuel flow path 2. In the fuel flow path 2 above the fuel inflow hole JC, an opening 15 A of a fuel introduction pipe 15 is opened, and an atmospheric open path 3 is opened at the uppermost position in the gravity direction of the fuel flow path 3. According to the above method, the steam flowing into the fuel flow path 2 from the opening 15 A of the fuel introduction pipe 15 flows into the fuel flow path 2 and then converges toward the open air path 3 located at an upper position. In addition to 15 312 / Invention Specification (Supplement) / 93-06 / 93106301 200426303, the steam located in the fuel flow path 2 also converges toward the open air path 3 located above. Then, the on-off valve 4 is manually operated to open the atmosphere open passage 3, and the steam converging near the atmosphere open passage 3 is immediately opened to the atmosphere. In addition, if the fuel inflow hole J C of the fuel injection valve J is opened at the lowest position in the gravity direction of the fuel flow path 2, steam is prevented from passing through the fuel inflow hole J C and entering the fuel injection valve J. The reason is that, due to the buoyancy of the steam itself, the steam moves upward, and moves toward the side away from the fuel inflow hole J C. In addition, if the longitudinal axis line X-X of the fuel flow path 2 inserted below the inflow-side end portion JA supporting the fuel injection valve J and the longitudinal axis line Y-Y of the atmosphere open passage 3 are provided on substantially the same straight line, The longitudinal axis line Z — Z of the fuel introduction pipe 15 facing the fuel flow path 2 intersects with Le: material flow path 2 (here, “crossing” refers to the opening 15 A of the fuel introduction pipe 15 and the fuel flow path 2 The side walls are opposed), which can more effectively prevent steam from flowing into the fuel injection valve J. That is, when the atmosphere open passage 3 is opened by the on-off valve 4, the fuel flow flowing through the atmosphere open passage 3 is opposite to the fuel flow toward the fuel inflow hole J C of the fuel injection valve J. In addition, the fuel flowing into the fuel flow path 2 from the opening 15 A of the fuel introduction pipe 15 collides with the side wall of the fuel flow path 2. This allows the steam to be crushed in a finer size and can be directed toward the atmosphere. This fine steam is mixed into the fuel flow of the open passage 3, and the exhaustability of the steam from the atmosphere open passage 3 can be further improved. 16 312 / Invention Specification (Supplement) / 93-06 / 93106301 200426303 Furthermore, the structure of the on-off valve 4 is not limited to the embodiment, and may be a type that can be opened and closed by manual operation. Hereinafter, another embodiment of the present invention will be described with reference to FIG. 3. This embodiment has a plurality of fuel injection valves J. 2 0 indicates that a fuel pipe 21 having a horizontal fuel flow path 21 is opened inside, and an opening W on one side of the fuel flow path 21 is closed by a fuel introduction pipe 22. The fuel introduction pipe 22 and a fuel pump (FIG. (Not shown). The fuel introduction pipe 22 is opened in the fuel flow path 21 through the opening 2 2A. In addition, a plurality of injection valve support holes 2 1 A are opened below the fuel flow path 21 in the direction of gravity, and the injection valve support holes 2 1 A are opened in the direction of gravity above the fuel flow path 21 in the direction of gravity to inject. The valve support hole 21A opens downward in the gravity direction. In this embodiment, three injection valve support holes 2 1 A are opened. In addition, 2 2 denotes an atmosphere open path, one end of which is opened above the gravity direction of the fuel flow path 21 and the other end is opened toward the atmosphere. That is, the opening position with respect to the fuel flow path 21 in the atmosphere open passage 22 is a position above the gravity direction in the injection valve support hole 2 1 A relative to the opening position of the fuel flow path 21. Reference numeral 23 indicates a normally-operated, normally-closed on-off valve that realizes the opening and closing of the atmospheric open passage 22. In a non-operating state, the on-off valve 23 maintains the atmospheric open passage 22 closed. That is, in the on-off valve 23, in the non-operating state, the valve body 2 3 A closes the valve seat 2 2 A of the atmosphere open passage 2 2 under the action of the spring force of the spring 24, and in the operating state, the valve body 2 3 A opens against the spring force of spring 2 4. 17 312 / Invention specification (Supplement) / 93-06 / 93106301 200426303 2 5 indicates a throttle body, and an intake passage 1 1 is opened in a through manner in the interior thereof, and the intake passage 1 1 passes through a throttle 1 3 To achieve opening and closing, the throttle valve 13 is mounted on a throttle rod 12 that is rotatably supported on the throttle body 25. In this embodiment, three intake passages 11 are opened, and each intake passage is opened and closed by a corresponding throttle valve 13. In addition, each of the intake passages 11 of the throttle body 25 is provided with an injection valve support hole 2 5 A facing upward. In addition, the fuel pipe 20 is fixed to the fixing member 2 5 B of the throttle body 25 by bolts. At this time, the inflow-side end portion JA of the fuel injection valve J is inserted into the fuel pipe airtightly through a 0 ring. In the injection valve support hole 21 A of 20, the discharge-side end portion JB of the fuel injection valve J is hermetically inserted into the injection valve support hole 25 A provided in the throttle body 25 through a 0 ring. That is, each fuel injection valve J is sandwiched between the fuel pipe 20 and the throttle body 25 in a non-detachable manner. The plurality of fuel injection valves J may be sandwiched between the fuel pipe and the intake pipe, as in the first embodiment. If the above method is adopted, the fuel inflow hole JC of each fuel injection valve J is opened below the gravity direction of the fuel flow path 21 of the fuel pipe 20, and the atmosphere opening hole 22 is opened in the fuel inflow hole JC. In the upper fuel flow path 21, an opening 2 2 A of the fuel introduction pipe 22 is connected to one side W of the fuel flow path 21 and opened, and the above-mentioned atmospheric opening hole 2 2 is located at the other end of the fuel flow path 21. One side R. If the fuel pipe of the present invention having the plurality of fuel injection valves J described above is used, the hot restart can be performed satisfactorily. 18 312 / Invention Specification (Supplement) / 93-06 / 93106301 200426303 The reason is that when the internal combustion engine is started, the on-off valve 2 3 can be operated manually to open the atmosphere open passage 2 2 and open the atmosphere open passage 2 2. The steam in the fuel flow path 21 of the fuel pipe 20 is exhausted to the outside. In particular, in this embodiment, it should be noted that the fuel flow path 2 1 of the fuel pipe is disposed substantially in a horizontal direction, and the fuel introduction pipe 2 2 is connected to one side W of the fuel flow path 21, and the fuel flow path 2 1 Below the direction of gravity, a fuel inflow hole JC for each fuel injection valve J is opened. In addition, an atmosphere opening passage 22 having an on-off valve 23 is opened on the other side R of the fuel flow path 21 and is opened in the fuel inflow hole. The inside of the fuel flow path 21 above the opening position of JC in the direction of gravity. If the above-mentioned method is used, when the on-off valve 23 is operated to open the atmosphere open passage 22, the fuel in the fuel flow path 21 is turned from one side W (right side in the figure) to the other side with good potential energy. R (left side in the figure) flows, and if so, the steam trapped inside the fuel introduction pipe 22 and the fuel flow path 2 1 flows toward the opening of the atmosphere open passage 22 together with the fuel flowing to the left. On the other hand, the above-mentioned steam converges to an upper position in the fuel flow path 21 due to its buoyancy. However, the steam converges toward the upper side of the fuel flow path 21, and converges toward the opening of the atmosphere open passage 22 together with the fuel flowing to the left inside the fuel flow path 21, and the steam passes through the atmosphere open passage 22, effectively. Ground discharge. In addition, even when the internal combustion engine is left for a long period of time, when the internal combustion engine is started, the fuel with deteriorated performance can be discharged similarly to steam, so 19 312 / Invention Manual (Supplement) / 93-06 / 93106301 200426303 After the startability. (Effects of the Invention) As described above, if the fuel pipe of the fuel injection device of the present invention is used, since the fuel pipe has a fuel flow path therein, the fuel pipe fixed to the fixed member has the inflow side end portion of the fuel injection valve inserted into it. Below the direction of gravity, the fuel inlet of the fuel injection valve is connected to the fuel flow path, and inside the fuel flow path at the position above the gravity direction of the fuel inlet, there is a fuel inlet pipe connected to the fuel pump. In addition, in the fuel flow path at a position above the gravity direction of the opening of the fuel introduction pipe, an air open passage communicating with the atmosphere is opened, and a normally closed type is provided in the air open passage. On-off valve. The on-off valve is manually operated to open and close the atmosphere open path. Therefore, when the on-off valve is restarted when the hot room is restarted, steam trapped in the fuel introduction pipe and the fuel flow path of the fuel pipe can be passed through the atmosphere open path. , Effectively discharges to the outside, which can improve the restartability of the hot room and improve the long-term internal combustion Startup and operation of the internal combustion engine immediately after starting after. In addition, if the longitudinal axis line of the fuel flow path inserted into the end portion of the inflow side of the fuel injection valve and the longitudinal axis line of the atmospheric open path are provided on the same straight line and face the longitudinal axis center of the fuel introduction pipe of the fuel flow path The intersection of the line and the fuel flow path can further improve the exhaustion of steam from the open path of the atmosphere, and further prevent steam from entering the interior of the fuel injection valve, which can further improve the restartability of the hot room and the start-up of the internal combustion engine after long-term placement. Sex. It has a fuel flow path substantially horizontal in the interior, and is fixed to the fuel pipe on the fixed member of the fixed member 20 312 / Invention Manual (Supplement) / 93-06 / 93106301 200426303. The inflow side end of each fuel injection valve is inserted. Below the direction of gravity, the fuel inflow hole of each fuel injection valve is connected to the fuel flow path, and on the side of the fuel flow path, there is an opening of a fuel introduction pipe connected to the fuel pump. In the fuel flow path on the other side of the fuel flow path and in a position above the gravity direction of the fuel inflow hole of each fuel injection valve, an air open passage communicating with the atmosphere is opened. The closed-type on-off valve can be manually operated to open and close the atmosphere open passage. The above-mentioned effect can be achieved in a fuel injection device having a plurality of fuel injection valves. [Brief Description of the Drawings] Fig. 1 is a longitudinal sectional view of a main part showing a first embodiment of a fuel pipe of a fuel injection device of the present invention. FIG. 2 is an enlarged sectional view of the on-off valve used in FIG. 1. Fig. 3 is a longitudinal sectional view of a main part showing a second embodiment of a fuel pipe of a fuel injection device of the present invention. Fig. 4 is a sectional view of a main part of a fuel pipe of a conventional fuel injection device. (Description of component symbols) A Air purifier E Internal combustion engine J Fuel injection valve JA Inflow side end JB Discharge side end JC Fuel inflow hole 21 312 / Instruction manual (Supplement) / 93-06 / 93106301 200426303 JD Injection hole K In Gas pipe K1 Mounting convex part K2 Wide injection support hole P Fuel pump pressurized fuel tank 1 Fuel pipe 1 A Bottom 1B Top 2 Fuel flow path 3 Open air path 3A Female thread 4 On-off valve 5 Valve body 5A Open hole 5B valve Seat 5C Operating lever 5D Lower step 5E Gasket 6 Valve body 7 Spring 8 Seal ring 10 Λ / τ Flow valve body 11 Internal air inlet path 12 ArAr Flow valve lever 22 312 / Invention manual (Supplement) / 93- 06/93106301 200426303 13 々 / Γ Flow valve 14 Fuel flow path 15 Fuel introduction pipe 1 5A opening 16 Small screw 17 Support plate 18 Fuel passage through fuel pipe 20 Fuel pipe 21 Fuel flow path 22 Fuel introduction pipe 22A Open σ section 23 Open23A valve body 24 valve 25 valve spring body section 25A ejection valve member 25B fixed to the support hole
312/發明說明書(補件)/93-06/93106301 23312 / Invention Specification (Supplement) / 93-06 / 93106301 23