1275707 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種供給燃料至引擎之燃料供給裝置及具 備其之車輛。 【先前技術】 作為供給燃料至引擎之燃料供給裝置，有將燃料噴射养 配設於吸氣通路之節氣閥之下游側及上游側者。又，作為 此種燃料喷射器之配置構造，有將下游側之燃料喷射器配 置於吸氣通路之外側，將上游側之燃料噴射器配置於較吸 氣通路之吸人Π更上游側且大致平行於吸氣通路之轴線者 (例如參照專利文獻1)。 專利文獻1:日本專利特開平1〇-196494號公報 發明所欲解決之問題 下游側及上游側之燃料喷射考 、身了盗均於引擎之吸氣步驟中嗔 射燃料。然而，開始吸氣步驟時， 、 守糟由吸氣閥打開可能於 吸氣通路内產生脈動波，該 脈動波向者吸入口逆流動於吸 氧通路内。脈動波係空氣之 L 在波，精此自燃料噴射器噴 射之燃料有時向著吸入口方 、 、 妒炎「； 处机動於吸氣通路内（以下 %為1吹回」）。 若自燃料噴射器噴射之燃料以 料嘖射55喳Μ ^ 方式σ人回，則即使自燃 寸十贺射為贺射燃料，一部分燃料 η Μ ^ ^ hi ^ > “、、去供給至引擎。因此， 并寸別疋於引擎之鬲運轉/高負荷 t ^ ^ , H, ^ .I ^ 存有至引擎之燃料供給 里+足，引發引擎性能之下降之問題。 本發明係鑒於上述先前之問題點 1毛而成者，本發明之 97328.doc 1275707 目的在於提供一種即使於引擎之高運轉/高負荷時等亦可 供給充足之燃料的燃料供給裝置。 【發明内容】 本發明之燃料供給裝置具備吸氣通路’其含有導入空氣 之開口部，將自上述開口部導入之空氣供給至引擎；以及 喷射器，其配置於上述吸氣通路之外方，並喷射燃料於導 入至上述開口部之空氣，上述吸氣通路係包含剝離層誘發 部者，該剝離層誘發部將導入於上述開口部之空氣自通路 内面剝離之剝離層誘導至上述開σ部或者自上述開口部誘 導至下游側。 又，本發明之其他燃料供給裝置具備吸氣通路，其含有 導入空氣之鐘形嘴及連接於上述鐘形嘴之下游端之通路本 體，並將自上述鐘形嘴導入之空氣通過上述通路本體引導 至引擎’·以及噴射器，其離開上述鐘形嘴而設於上述鐘形 嘴之上游側，並噴射燃料於導入於上述鐘形嘴之空氣；且 上述鐘形嘴之下游端之流路方向的切線與上述通路本體之 與上述鐘形嘴之連接端之流路方向的切線不連續。 再者’本發明之其他燃料供給裝置具備吸氣通路，其含 有導入空氣之開口部，將自上述開口部導入之空氣供給至 引擎，以及噴射器，其配置於上述吸氣通路之外方，並喷 射燃料於導入於上述開口部之空氣；且上述吸氣通路係具 備燃料捕捉部者，該燃料捕捉部於上述開口部捕捉自較上 述開口部更下游側向著上述開口部逆流之燃料。 依據上述燃料供給裝置，自吸氣通路之下游側乘著脈動 97328.doc 1275707 波吹回之燃料於開口部被捕捉後，變成滴狀再次供給至引 擎。因此，抑制自喷射器喷射之燃料飛散至吸氣通路之開 口部外方，燃料之全部可供給至引擎。故而，即使於引擎 之高運轉/高負荷時，亦可供給充足量之燃料，可提高引擎 性能。 發明之效果 依據本發明，即使於引擎之高運轉/高負荷時等亦可供給 充足之燃料，提高引擎之性能。 【實施方式】 基於附圖說明本發明之實施形態。 圖1係表示本發明之實施形態之車輛之例的側面圖。本實 施形怨之車輛係機車（包含摩托車、速克達等）丨〇〇。同圖中， 左側係車輛前方，右側係車輛後方。機車丨〇〇包含取入空氣 之取入口81、空氣淨化器10、引擎21及消音器84。再者， 本貫施形態之引擎21係水冷式四行程並排四汽缸引擎。取 入口 81與空氣淨化器1〇經由吸氣管82連接。空氣淨化器w 與引擎2丨之燃燒室2c(於圖丨中未圖示。參照圖2)經由吸氣通 路90連接。燃燒室仏與消音器84經由排氣通路83連接。於 空氣淨化器10之内部配置有上游側燃料噴射器14，於吸氣 通路90配置有下游側燃料喷射器13。 於機車100,自取入口81吸入之空氣通過吸氣管82引導至 空氣夺化器ίο。其後，藉由空氣淨化器1()淨化之空氣與自 燃料喷射器U喷射之燃料吸入至吸氣通路9〇。於吸氣通路 9〇中’自燃料喷射器13進—步噴射燃料。其後，吸氣通路 97328.doc 1275707 90内之空氣與燃料於引擎2 1之吸氣步驟中供給至燃燒室 2c ° 供給至燃燒室2c之空氣與燃料於壓縮步驟中得以壓縮， 於燃燒步驟中燃燒之後，於排氣步驟中送出至排氣通路 83。送出至排氣通路83之排出氣體自消音器84排放至外部。 於以下說明中，將自取入口 81通過空氣淨化器1〇及吸氣 通路90供給至引擎21之燃燒室2c之空氣之氣流方向的上游 簡單稱為上游，將該氣流方向之下游簡單稱為下游。 圖2及圖3係用以說明燃料供給裝置之圖。如圖2所示，於 引擎21之汽缸體丨之上側合面la搭載有汽缸蓋2。汽缸蓋二與 汽缸體1藉由未圖示之汽缸蓋螺絲締結。於汽缸蓋2之上側 合面2a裝接有缸頭蓋3。該引擎21相對於車體框安裝為前傾 狀態或起立狀態，引擎21之缸徑軸線B相對於垂直線v成〇 至50度之角度。 於汽缸盍2之下側合面2b形成凹部，該凹部形成燃燒室2c 之一部分。開口於燃燒室2c之吸氣閥開口 2d、排氣閥開口 (未圖示）分別藉由吸氣閥4a、排氣閥4b得以打開關閉。此等 吸氣閥4a、排氣閥仆分別藉由吸氣凸輪軸化、排氣凸輪軸 5b得以開關驅動。 吸氣閥開口 2d形成於吸氣孔2e之下游端，於吸氣孔。之 上游端形成有外部連接口 2f。於外部連接口 2f經由筒狀之接 口構件6連接有筒狀之節氣閥體7。進而，於節氣閥體7之上 ^而开7成有連接口 7b，於連接口 7b連接有通風井8。藉由此 等t風井8、節氣閥體7、接合構件6以及吸氣孔2e形成含有 97328.doc 1275707 直線狀之中心線A之吸氣通路90。再者，該中心線A相對於 缸徑軸線B成20至50度之角度。 接合構件6係耐熱橡膠製圓筒狀者，接合構件6之下端法 蘭部（未圖示）螺栓固定於汽缸蓋2之外部連接口叮的周邊。 於接合構件6之上端連接口 6a内插入有節氣閥體7之下游開 口部7a，接合構件6與節氣閥體7藉由固定帶讣得以固定。 節氣閥體7係圓筒狀者，於其長度方向略中央處配置有節 氣閥9。該節氣閥9具備閥軸9a，其於平行於凸輪軸之方向 (以下稱為凸輪軸方向）貫通節氣閥體7 ;以及閥板外，其固 定於閥軸9a。雖省略圖示，閥軸％藉由連結體與相鄰之節 氣閥之閥軸連結。於該連結體裝接有節氣閥滑輪，該節氣 閥滑輪經由節氣閥電線連結於操向柄之節氣閥夹。 連接於各節氣閥體7之上游端之通風井8開口於空氣淨化 器1〇内。該空氣淨化器10包含延伸於車寬度方向（凸輪軸方 向）之箱狀空氣淨化器盒U。於空氣淨化器盒u之内=形成 有吸氣室，並配設有元件12。 空氣淨化器盒11係包含下側盒Ua與上侧盒之上下兩 分割，者。形成於下侧盒lla、上侧盒llb之分割面之周邊 的法蘭部11 e、11 f藉由螺栓得以固定。 下側盒lla劃分為前側部分與後側部分，於前側部分形成 開口於下方之空氣入口 Uc，後側部分含有膨出於下方之出 口糾d。且於該出口部⑴之底面，裝接有四組以各汽缸 為單位之通風井8。再者’將空氣淨化器1()配設於特定位置 時，各通風井8嵌合於上述各汽缸之節氣 97328.doc 11 1275707 元件12係覆蓋下側盒Ua之空氣入口 Uc之厚板狀者，藉 由兩法蘭部lie、Ilf得以夾持。上側盒Ub於橫剖面看大致 成圓弧狀。藉由上側盒Ub具有此種圓弧形狀，於元件12之 二次侧（較元件12更下游侧）確保必要之容積。又，自空氣入 口 11c吸入之空氣之主流以其中心線厘成圖2所示之圓弧狀 之方式改變流通方向，並引導至通風井8。 於較各節氣閥體7之節氣閥9更下游側，以各汽缸為單位 配设下游側燃料噴射器13，於上游側以各汽缸為單位配設 上游側燃料喷射器14。 於節氣閥體7之後壁，即夾著吸氣通路中心線八位於汽缸 軸線B之相反側之壁，形成有輪轂部7〇。各燃料喷射器13 於插入於輪轂部7c之狀態下得以固定。再者，燃料噴射器 13之喷射喷嘴13c之尖端部位於節氣閥體7之内表面附近。 且自凸輪軸方向（再者，凸輪軸方向亦係曲柄軸方向）看，燃 料喷射器13之喷射軸線13a於吸氣孔2〇之入口附近與吸氣 通路軸線A交叉，又指向吸氣孔。之天壁。於各燃料喷射器 13之上端設有燃料導入部13b ,各燃料導入部連接於自 燃料供給管1 7分歧之管道1 7a。該燃料供給管丨7延伸於凸輪 軸方向，係於各燃料噴射器13通用者。 各燃料喷射器14經由通用之支撐托架15支撐於空氣淨化 器1〇之上側盒lib之後壁iig。支撐托架15形成為含有縱壁 15a與橫壁15b之橫剖面略L字形狀。縱壁15&與橫壁之左 右兩端部以略三角形狀之端壁i 5c分別連接（參照圖3)。於支 姜托采1 5與後壁11 g之間，劃分有略三角柱狀之別室。於縱 97328.doc • 12 - 1275707 土 15a、杈壁15b及端壁15e之周邊形成有法蘭部"卜法蘭 部15f以可裝卸之方式螺栓固定於後壁&。㈣，於法蘭 部15f與後壁llg之間存在密封構件l5e。 於橫壁爾成有膨出於下方之筒狀之輪轂部"d。各辦 料噴射器]4於插入於輪轂部15d之狀態下得以固定，喷射喷 嘴W自輪轂部15d突出於下方。於各燃料喷射器μ之上端 設有燃料導入部14b，燃料導入部⑽插入於自一根通用之 燃料供給官16分歧之管道16a内且得以連接。 如圖3所示，燃料供給管16之兩端貫通上側盒⑽之後壁 llg突出於後方(圖3之紙面背面方向)，於燃料供給管16之外 方突出部設有接合16b' 16e，該接合⑽、W連接於燃料 供給側及燃料返回側之燃料管。如圖2所示，於各燃料噴射 器14分別連接有供給電力用之配線“e。雖省略圖示，四組 供給電力用配線14e於捆束狀態下貫通後壁Ug，並導出至 外方。且於該導出端部設有連結用連接器。 以此方式，上述四個燃料喷射器丨4與燃料供給管16及供 給電力用配線14e—併安裝於支撐托架15，作為喷射器單元 知以體化。且該噴射器單元配設於空氣淨化器丨〇内。另一 方面，燃料供給管16之接合16b、16c與連接於配線14e之端 緣之連接器位於空氣淨化器10之外側，並與外部電路連接。 如圖2所示，各燃料噴射器14配置於成圓弧狀之空氣主流 之中心線Μ之外側（與圓弧之中心側相反之側）。又，自曲柄 軸方向看，各燃料喷射器丨4之嗔射軸線丨於節氣閥9之閥 軸％部分，與吸氣通路90之中心線A以及上述主流之中心線 97328.doc 1275707 Μ交叉。又，上述喷射軸線14a向著位於全開位置之閥板 9b(圖2中以兩點虛線圖示）之後面（圖2之右側面）。再者，支 樓托架15之縱壁15a亦作為使上述主流面向通風井$之導向 板發揮作用。 於本燃料供給裝置中，將上游側燃料喷射器14配置於成 圓5瓜狀之空氣主流之中心線Μ的外侧，故而可抑制該燃料 Α射裔14吸引至吸氣通路90成為空氣流動之阻抗。因此， 可避免燃料喷射器14之空氣阻抗成為阻礙引擎輸出之提高 的主要原因。 又，自凸輪軸方向看時，主流之中心線M與燃料喷射器 14之喷射軸線14a於較吸氣通路9〇之上游端開口（通風井8 之上端開口）更下游側，更加詳細的是於節氣閥9之閥軸％ 部分交叉，故而可抑制燃料之吹回。 又，於本燃料供給裝置_，將燃料喷射器14、燃料供給 管16以及供給電力用配線14e安裝於支撐托架15，藉此作為 喷射器單元一體形成。且將該喷射器單元配置於空氣淨化 器10内，以可裝卸之方式螺栓固定於空氣淨化器盒丨丨。故 而，不拘於具備複數個燃料噴射器14，可簡化此等燃料噴 射器14或燃料供給管16等之安裝作業。又，喷射器單元整 體位於空氣淨化器盒U内，特別是燃料噴射器14未突出於 外方，故而可避免燃料喷射器14與其他車載零件干擾並損 傷等之問題。 Λ 又，於本燃料供給裝置中，使燃料供給管16之兩端部突 出於二氣淨化益盒丨i之外側，於該突出部設置接合1 、 97328.doc -14- 1275707 16c。又，將連接於供給電力用配線14e之端緣之連接器配 置於空氣淨化器盒11之外側。故而，不拘於將噴射器單元 配置於空氣淨化器10内，可容易地進行燃料電路或電性電 路之連接及切離作業。 然而，上游側燃料噴射器14或空氣淨化器1〇之形狀等並 非僅限於上述者。如圖4所示，亦可實質性地將燃料喷射器 14配置於空氣淨化器㈣之外侧。本例中，空氣淨化器^ 之下侧盒11a之前侧部分(圖4之右側部分)較大地膨出於下 方’於該膨出部1U之側壁形成有吸入口以，。又，於上側 盒iib之後壁llg’相當於上述支撐托架15之支撑托架部⑸ 以膨出於空氣淨化器Μ之内方之方式__體形成。於該支 撐托架部15,之輪較部15d，上游側燃料喷射器"於插入狀態 下得以固定。 〜 此處’通風井8經由接合構件6，連接於節氣閥體7。通風 井8具有吸入側成略大徑之錐形狀，通風井8之尖端藉由鐘 形嘴（be11·，形《。且該卿嘴形成剝離層誘發部8a， :制離層誘K5於外方將吸入口此(參照圖5)之周邊彎曲成 圓弧狀換δ之，於吸入口 8b形成有剝離層誘發部^，里 包含開I成放射狀之曲面。再者，成為剝離層誘發部Μ 曲面之“方向下游端以後之部分8c具有一樣之錐形狀。 〆錐形狀之邛刀8c、接合構件6’、節氣閥體卜接合構件6 以及吸氣孔2e形成吸㈣⑽之通路本體。 :嶋誘發部如以下方式構成··使通過通風井8吸引 至即孔閥體7之空氣流之剝離層&積極地形成於該通風井8 97328.doc 1275707 之内表面。 再者’於上述圖2及圖3所示之例主要係表示上游側燃料 喷射器14及空氣淨化器1〇之形狀或配置等之一例者，上述 例中省略通風井8之剝離層誘發部8a之圖示及說明。 如圖5所示’將通風井8之吸入口 8b之直徑設為〇時，剝離 層誘發部8a成為氣流方向之曲率半徑r為0.33至〇.〇lxD左右 之圓弧狀之曲面。此處將上述曲率半徑r設為〇.33xD之情形 呀，流量係數約為〇·99。然而，曲率半徑『為〇33><1)之情形 呀，不會因吸氣入口角度產生流動之縮流，但曲率半徑^不 滿〇·33xD時，則流量係數惡化，並且產生邊界層之剝離。 此處，上述數值〇·33成為形成剝離層a時上述曲率半徑r對於 上述直徑D之比率r/D之臨限值。再者，剝離層&之形狀或大 小可藉由變更曲率半徑r或直徑D調節。 進而，成為剝離層誘發部8a之曲面之氣流方向下游端的 之部分8c，相互對向之位置1275707 IX. Description of the Invention: [Technical Field] The present invention relates to a fuel supply device for supplying fuel to an engine and a vehicle therewith. [Prior Art] As the fuel supply device that supplies fuel to the engine, the fuel injection is provided on the downstream side and the upstream side of the throttle valve of the intake passage. Further, as an arrangement structure of such a fuel injector, the fuel injector on the downstream side is disposed on the outer side of the intake passage, and the fuel injector on the upstream side is disposed on the upstream side of the intake passage of the intake passage. It is parallel to the axis of the intake passage (for example, refer to Patent Document 1). The problem to be solved by the invention is that the fuel injection test on the downstream side and the upstream side and the smashing are all igniting the fuel in the intake step of the engine. However, when the inhalation step is started, the opening of the inhalation valve may generate a pulsating wave in the inhalation passage, and the pulsating wave flows backward into the oxygen inhalation passage toward the suction port. The pulse wave is the air L. In the case of the wave, the fuel injected from the fuel injector sometimes faces the suction port and the sputum is “moved in the intake passage (the following is 1 blown back). If the fuel injected from the fuel injector is injected in the way of 55 喳Μ ^, then even if the self-ignition is in the form of a fuel, a part of the fuel η Μ ^ ^ hi ^ > Therefore, the problem is that the engine is running/high load t ^ ^ , H, ^ .I ^ exists in the fuel supply to the engine + foot, causing a drop in engine performance. The present invention is based on the above The problem of the problem is that the fuel supply device of the present invention can be supplied to the fuel supply device of the present invention even when the engine is operated at a high load/high load. The supply device includes an intake passage that includes an opening for introducing air, and supplies air introduced from the opening to the engine, and an ejector that is disposed outside the intake passage and injects fuel into the opening. In the air of the portion, the air intake passage includes a peeling layer inducing portion that induces the peeling layer in which the air introduced into the opening portion is peeled from the inner surface of the passage to the opening σ portion or Further, the fuel supply device of the present invention is provided with an intake passage including a bell-shaped nozzle for introducing air and a passage body connected to a downstream end of the bell-shaped nozzle, and the bell is supplied from the bell The air introduced by the nozzle is guided to the engine '· and the ejector through the passage body, and is disposed on the upstream side of the bell mouth away from the bell mouth, and injects fuel into the air introduced into the bell mouth; The tangent to the flow path direction of the downstream end of the bell mouth is not continuous with the tangent of the flow path direction of the connection end of the passage body with the bell mouth. Further, the other fuel supply device of the present invention includes an intake passage. An opening including the introduction air, the air introduced from the opening is supplied to the engine, and the ejector is disposed outside the intake passage, and injects fuel into the air introduced into the opening; and the suction The passage system includes a fuel catching portion that captures a fuel that flows backward from the opening toward the downstream side of the opening in the opening According to the above-described fuel supply device, the fuel blown back by the pulsation 97328.doc 1275707 from the downstream side of the intake passage is captured in the opening, and then supplied to the engine in a drop shape. Therefore, the fuel injected from the injector is suppressed. The fuel is scattered outside the opening of the intake passage, and all of the fuel can be supplied to the engine. Therefore, even when the engine is operated at high speed or high load, a sufficient amount of fuel can be supplied to improve engine performance. According to the present invention, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a view showing a vehicle according to an embodiment of the present invention. A side view of an example. The vehicle of the present invention is a locomotive (including a motorcycle, a speed, etc.). In the same figure, the left side is in front of the vehicle and the right side is behind the vehicle. The locomotive includes an intake port 81 for taking in air, an air cleaner 10, an engine 21, and a muffler 84. Furthermore, the engine 21 of the present embodiment is a water-cooled four-stroke side-by-side four-cylinder engine. The inlet port 81 is connected to the air cleaner 1 via an intake pipe 82. The air cleaner w and the combustion chamber 2c of the engine 2 (not shown in Fig. 2, see Fig. 2) are connected via an intake passage 90. The combustion chamber 仏 and the muffler 84 are connected via an exhaust passage 83. An upstream side fuel injector 14 is disposed inside the air cleaner 10, and a downstream side fuel injector 13 is disposed in the intake passage 90. In the locomotive 100, the air taken in from the intake port 81 is guided to the air occupant ίο through the suction pipe 82. Thereafter, the air purified by the air cleaner 1 () and the fuel injected from the fuel injector U are sucked into the intake passage 9A. The fuel is injected from the fuel injector 13 in the intake passage 9'. Thereafter, the air and fuel in the intake passage 97328.doc 1275707 90 are supplied to the combustion chamber 2c in the suction step of the engine 21, and the air and fuel supplied to the combustion chamber 2c are compressed in the compression step in the combustion step. After the middle combustion, it is sent to the exhaust passage 83 in the exhaust step. The exhaust gas sent to the exhaust passage 83 is discharged from the muffler 84 to the outside. In the following description, the upstream of the airflow direction of the air supplied from the intake inlet 81 to the combustion chamber 2c of the engine 21 through the air cleaner 1〇 and the intake passage 90 is simply referred to as the upstream, and the downstream of the airflow direction is simply referred to as the downstream. Downstream. 2 and 3 are views for explaining a fuel supply device. As shown in Fig. 2, a cylinder head 2 is mounted on the upper surface la of the cylinder block of the engine 21. The cylinder head 2 and the cylinder block 1 are connected by a cylinder head screw (not shown). A cylinder head cover 3 is attached to the upper surface 2a of the cylinder head 2. The engine 21 is mounted in a forwardly inclined state or in an upright state with respect to the vehicle body frame, and the cylinder bore axis B of the engine 21 is at an angle of 〇 to 50 degrees with respect to the vertical line v. A recess is formed in the lower joint surface 2b of the cylinder bore 2, and the recess forms a part of the combustion chamber 2c. The intake valve opening 2d and the exhaust valve opening (not shown), which are opened in the combustion chamber 2c, are opened and closed by the intake valve 4a and the exhaust valve 4b, respectively. The intake valve 4a and the exhaust valve are respectively driven by the intake camshaft and the exhaust camshaft 5b. The suction valve opening 2d is formed at the downstream end of the suction hole 2e at the suction hole. An external connection port 2f is formed at the upstream end. A tubular throttle body 7 is connected to the external connection port 2f via a cylindrical joint member 6. Further, a connection port 7b is opened 7 above the throttle valve body 7, and a ventilation hole 8 is connected to the connection port 7b. The intake shaft 90 including the linear center line A of 97328.doc 1275707 is formed by the t-air well 8, the throttle body 7, the joint member 6, and the intake hole 2e. Further, the center line A is at an angle of 20 to 50 degrees with respect to the bore axis B. The joining member 6 is made of a heat-resistant rubber cylindrical shape, and the lower end flange portion (not shown) of the joining member 6 is bolted to the periphery of the outer connecting port of the cylinder head 2. A downstream opening portion 7a of the throttle body 7 is inserted into the upper end connecting port 6a of the engaging member 6, and the engaging member 6 and the throttle body 7 are fixed by a fixing band. The throttle body 7 is cylindrical, and a throttle valve 9 is disposed slightly in the longitudinal direction. The throttle valve 9 is provided with a valve shaft 9a that penetrates the throttle body 7 in a direction parallel to the cam shaft (hereinafter referred to as a camshaft direction) and a valve plate outside, and is fixed to the valve shaft 9a. Although not shown, the valve shaft % is coupled to the valve shaft of the adjacent throttle valve by the connecting body. A throttle valve pulley is attached to the connecting body, and the throttle valve pulley is coupled to the throttle clamp of the steering handle via a throttle wire. A ventilation well 8 connected to the upstream end of each throttle body 7 is opened in the air cleaner 1A. The air cleaner 10 includes a box-shaped air cleaner case U extending in the vehicle width direction (cam axis direction). Within the air purifier box u, there is a suction chamber and an element 12 is provided. The air cleaner case 11 includes two upper and lower sides of the lower case Ua and the upper case. The flange portions 11e, 11f formed on the periphery of the divided faces of the lower casing 11a and the upper casing 11b are fixed by bolts. The lower side casing 11a is divided into a front side portion and a rear side portion, and an air inlet Uc opening downward is formed in the front side portion, and the rear side portion is provided with an outlet swell which is swollen downward. And on the bottom surface of the outlet portion (1), four sets of ventilation wells 8 in units of cylinders are attached. In addition, when the air purifier 1 () is disposed at a specific position, each ventilation well 8 is fitted to the throttle of each of the above cylinders 97372.doc 11 1275707 The component 12 is a thick plate that covers the air inlet Uc of the lower casing Ua. By the two flange parts lie, Ilf can be clamped. The upper side case Ub has a substantially arc shape when viewed in a cross section. Since the upper side case Ub has such a circular arc shape, the necessary volume is secured on the secondary side of the element 12 (the downstream side of the element 12). Further, the main flow of the air taken in from the air inlet 11c is changed in the flow direction by the center line to form an arc shape as shown in Fig. 2, and is guided to the ventilation shaft 8. On the downstream side of the throttle valve 9 of each throttle body 7, the downstream side fuel injector 13 is disposed in units of cylinders, and the upstream side fuel injector 14 is disposed on the upstream side in units of cylinders. A hub portion 7A is formed in the wall behind the throttle body 7, i.e., the wall on the opposite side of the cylinder axis B, sandwiching the center line of the intake passage. Each of the fuel injectors 13 is fixed in a state of being inserted into the hub portion 7c. Further, the tip end portion of the injection nozzle 13c of the fuel injector 13 is located near the inner surface of the throttle body 7. And from the direction of the camshaft (again, the direction of the camshaft is also the direction of the crankshaft), the injection axis 13a of the fuel injector 13 intersects the axis A of the intake passage near the inlet of the intake hole 2, and points to the suction hole. . The sky wall. A fuel introduction portion 13b is provided at an upper end of each fuel injector 13, and each fuel introduction portion is connected to a pipe 17a that is branched from the fuel supply pipe 17. The fuel supply pipe 7 extends in the camshaft direction and is common to each of the fuel injectors 13. Each fuel injector 14 is supported by a common support bracket 15 on the side wall lib of the side of the air cleaner 1A. The support bracket 15 is formed to have a substantially L-shaped cross section including the vertical wall 15a and the lateral wall 15b. The vertical wall 15& and the left and right end portions of the lateral wall are respectively connected by end walls i 5c having a substantially triangular shape (see Fig. 3). Between Jiang Zhicao 1 5 and the back wall 11 g, there is a slightly triangular column-shaped chamber. In the vertical direction, the flange portion " flange portion 15f is detachably bolted to the rear wall & (4) A sealing member 15e exists between the flange portion 15f and the rear wall 11g. In the horizontal wall, there is a cylindrical portion of the wheel that protrudes from below. Each of the material injectors 4 is fixed in a state of being inserted into the hub portion 15d, and the injection nozzle W protrudes downward from the hub portion 15d. A fuel introduction portion 14b is provided at an upper end of each fuel injector μ, and the fuel introduction portion (10) is inserted into and connected to a pipe 16a which is branched from a common fuel supply company 16. As shown in FIG. 3, after both ends of the fuel supply pipe 16 pass through the upper side casing (10), the wall 11g protrudes rearward (the direction of the back side of the paper in FIG. 3), and the outer protruding portion of the fuel supply pipe 16 is provided with a joint 16b' 16e. The joints (10) and W are connected to the fuel pipe on the fuel supply side and the fuel return side. As shown in Fig. 2, each of the fuel injectors 14 is connected to a wiring "e" for supplying electric power. Although not shown, the four sets of power supply wirings 14e penetrate the rear wall Ug in a bundled state and are led to the outside. In this manner, the four fuel injectors 4, the fuel supply pipe 16, and the power supply wiring 14e are attached to the support bracket 15 as an injector unit. The ejector unit is disposed in the air cleaner 。. On the other hand, the joints 16b, 16c of the fuel supply pipe 16 and the connector connected to the end edge of the wire 14e are located in the air cleaner 10. The outer side is connected to an external circuit. As shown in Fig. 2, each fuel injector 14 is disposed on the outer side of the center line 成 of the arc-shaped air main flow (the side opposite to the center side of the circular arc). Viewed in the axial direction, the injection axis of each fuel injector 丨4 is offset from the valve shaft % portion of the throttle valve 9, intersecting the center line A of the intake passage 90 and the center line 97328.doc 1275707 of the main flow. The injection axis 14a is facing the full open position The valve plate 9b (shown by a two-dot chain line in Fig. 2) is disposed behind (the right side surface of Fig. 2). Further, the vertical wall 15a of the branch bracket 15 also serves as a guide plate for the above-mentioned main flow facing the ventilation shaft $ In the present fuel supply device, the upstream fuel injector 14 is disposed outside the center line 成 of the air main body in the shape of a circle 5, so that the attraction of the fuel ray 14 to the intake passage 90 can be suppressed. The impedance of the air flow. Therefore, the air resistance of the fuel injector 14 can be prevented from becoming a major factor that hinders the increase of the engine output. Moreover, when viewed from the camshaft direction, the center line M of the main flow and the injection axis 14a of the fuel injector 14 are The upstream end opening of the intake passage 9 (the opening of the upper end of the ventilation shaft 8) is further downstream, and more specifically, the valve shaft % portion of the throttle valve 9 is partially crossed, so that the fuel can be suppressed from being blown back. In the supply device, the fuel injector 14, the fuel supply pipe 16, and the power supply wiring 14e are attached to the support bracket 15, thereby being integrally formed as an injector unit, and the injector unit is disposed in the air cleaner 10. It is detachably bolted to the air cleaner case 丨丨. Therefore, the installation of the fuel injector 14 or the fuel supply pipe 16 and the like can be simplified without being provided with a plurality of fuel injectors 14. The unit as a whole is located in the air cleaner case U, and in particular, the fuel injector 14 does not protrude outside, so that problems such as interference and damage of the fuel injector 14 with other on-vehicle components can be avoided. Λ Also, in the present fuel supply device, Both ends of the fuel supply pipe 16 are protruded from the outer side of the second gas purification benefit cartridge 丨i, and the joints 1 and 97328.doc -14 - 1275707 16c are provided at the projections. Further, the ends of the fuel supply pipe 16 are connected to the end of the power supply wiring 14e. The edge connector is disposed on the outer side of the air cleaner case 11. Therefore, regardless of the arrangement of the ejector unit in the air cleaner 10, the connection and the cutting operation of the fuel circuit or the electric circuit can be easily performed. However, the shape of the upstream side fuel injector 14 or the air cleaner 1 is not limited to the above. As shown in Fig. 4, the fuel injector 14 can also be disposed substantially outside the air cleaner (4). In this example, the front side portion (the right portion of Fig. 4) of the lower side casing 11a of the air cleaner 2 is largely swelled downward, and a suction port is formed in the side wall of the bulging portion 1U. Further, the rear wall llg' of the upper casing iib is formed to correspond to the support bracket portion (5) of the support bracket 15 so as to bulge inside the air cleaner Μ. In the support bracket portion 15, the wheel portion 15d, the upstream side fuel injector is fixed in the inserted state. ~ Here, the ventilation shaft 8 is connected to the throttle body 7 via the joint member 6. The ventilation shaft 8 has a tapered shape with a slightly larger diameter on the suction side, and the tip end of the ventilation well 8 is formed by a bell-shaped nozzle (the shape of the bellows is formed by the bell-shaped mouth). The circumference of the suction port (see FIG. 5) is bent into an arc shape for δ, and a peeling layer inducing portion is formed in the suction port 8b, and a curved surface is formed in which the opening is formed into a radial shape. The portion 8c after the downstream end of the curved surface has the same tapered shape. The rake-shaped serpentine 8c, the joint member 6', the throttle body engagement member 6, and the intake hole 2e form the passage body of the suction (four) (10). The 嶋-inducing portion is configured as follows: The peeling layer & which is attracted to the air flow through the ventilating well 8 to the orifice valve body 7 is actively formed on the inner surface of the ventilating well 8 97328.doc 1275707. The examples shown in FIG. 2 and FIG. 3 are mainly examples of the shape or arrangement of the upstream fuel injector 14 and the air cleaner 1 , and the illustration of the peeling layer inducing portion 8 a of the ventilation shaft 8 is omitted in the above example. And the description. As shown in Figure 5, the suction port 8b of the ventilation shaft 8 is straight. When it is set to 〇, the peeling layer inducing portion 8a has an arcuate curved surface having a curvature radius r of 0.33 to 〇.〇lxD in the airflow direction. Here, the radius of curvature r is set to 〇.33xD, and the flow coefficient is It is about 〇·99. However, in the case where the radius of curvature is 〇33><1, the flow of the flow is not caused by the suction inlet angle, but the radius of curvature is less than 33·33xD, the flow coefficient is deteriorated. Here, the peeling of the boundary layer occurs. Here, the above numerical value 〇·33 is a threshold value of the ratio r/D of the curvature radius r to the diameter D when the peeling layer a is formed. Further, the shape of the peeling layer & The size can be adjusted by changing the radius of curvature r or the diameter D. Further, the portion 8c which is the downstream end of the airflow direction of the curved surface of the peeling layer inducing portion 8a is opposed to each other.
切線並未沿著通風井8之錐形狀 之切線之間交叉。即，剝離層^ 部分8c之上游端雖物理性連接 97328.doc 16 1275707 的流速最快。該切線方向之氣流未能形成沿著通風井8之内 面之氣流’而自該内面剝離，自該氣流於通風井8之内表面 侧形成空氣停滯之空間。該空間成為沿著通風井8之内表面 (即於吸氣通路9G之開口部附近成環狀）形成㈣離層&，自 與切線方向之氣流之流速差異產生負壓。 考慮形成該剝離層a之狀態下，於吸氣通路9〇内產生脈動 波之情形。脈動波係開始吸氣步驟時，藉由打開吸氣閥4a 自吸氣閥開口 2d產生之空氣之疏密波，向著吸人口此之方 向逆流動於吸氣通路90。 且自下游侧燃料噴射器13或上游側燃料噴射器14喷射之 燃料流入於吸氣通路90内時，該燃料藉由脈動波向著吸入 口 8b方向吹回。吹回之燃料到達通風井8之吸入口补時，將 自吸入口 8b飛散於空氣淨化器10内。 然而，如上所述，於形成於吸入口扑之附近之剝離層a產 生有負壓，故而傳送通過吸氣通路9〇之通路内面附近並吹 回之燃料粒子如圖7所示，藉由剝離層以寻以捕捉卷成旋 渦。且藉由剝離層a捕捉較多量之燃料粒子時，卷成旋渦之 燃料粒子結合成為滴狀，傳過吸氣通路9〇之通路内面並供 給至汽缸蓋2之燃燒室2c。 因此，燃料不會自吸入口 8b之周邊部分吹回至空氣淨化 态10内。另一方面，於吸入口 8b之中央部分，燃料將向著 空氣淨化器10内飛散（參照圖7)。 以此方式，於吸入口 8b之中央部分燃料將吹回，但吸入 口 8b為開放端，故而於吸入口 8b脈動波之傳播方向反轉， 97328.doc -17- 1275707 脈動波再次向著燃燒室2c行進於吸氣通路9〇内。同時，進 行吸氣步驟中通常之吸氣，空氣及燃料靠著脈動波供給至’ 燃燒室2c。藉此，可實現利用脈動波之充填效率之提高， _ 可實現引擎性能之進一步提高。 ’ 且自產生脈動波至如上述般進行吸氣為止之時間微小， 故而將自吸入口 8b之中央部分向著空氣淨化器1〇内吹回之 燃料於飛散至吸入口 8b之外方前再次自吸入口扑吸入。 又，燃料不會自吸入口 8b之周邊部分吹回至空氣淨化 10内’故而結果是，吹回通過吸氣通路90内之所有燃料再 次向著燃燒室2C。換言之，吹回之燃料不會飛散於空氣淨 化器10内，而供給至燃燒室2c。 再者，於本實施形態中，形成空氣停滞之剝離層a，故而 通風井8或節氣閥體7之實f性内徑相比未形成剝離層a之 凊开/車又】故而’較好的是考慮形成剝離層a之情形，將通 T井8或節氣閥體7之物理性内徑D設為比通常大。具體的 是’形成剝離層a時之實質性内徑為可確保引擎之期望輸出籲 所必要之吸氣量之程度即可。 *又’ ^可贱考慮因剝離層a之形成造成實質性内徑之狹 。里it風井8或gp氣間體7之形狀。關於形成剝離 二a之'刀之一部分或全部，將其物理性内獲設為比其他部 :大t較好。藉由該處理，即使通風井8等之實質内徑因剝^ 層a變小、，亦可緩和供給至燃燒室2〇之吸氣量之減少。 域燃料贺射器14以向著較吸氣通路％之剝離層&更内 側育射燃料之方式 ^ 弋置。換s之，燃料噴射器14向著通風 97328.doc -18- 1275707 井8之剝離層a之内側噴射燃料。於圖4中，符號係表示 燃料喷射裔14喷射燃料之方向之中心的噴射軸線。以該噴 射軸線14a與特定之喷射角規定之喷射區域（圖4中以虛線 表示）位於較剝離層a更内側，該剝離層&形成於吸氣通路 9〇。藉此，自燃料喷射器14噴射之燃料不會向著通風井8之 吸入口 8b之外方吹散，又，不會藉由剝離層&得以捕捉，而 與氣流一併流向吸氣通路9〇。 如以上說明，依據本實施形態，積極地形成剝離層a，自 該剝離層a向著吸氣通路9〇之中心側喷射燃料，因此可藉由 上述剝離層a阻止吹回之燃料飛散至外方，可抑制燃料之吹 回0 再者，於上述實施形態中，剝離層&僅形成於通風井8之 内側。然而，剝離層a亦可自通風井8延伸至接合構件6,或節 氣閥體7之内側。即，剝離層&至少可形成於吸氣通路卯之 開口部之一部分，剥離層&之氣流方向長度並非特別限定 者。 再者，於圖4所示之例中，節氣閥體7於節氣閥9之上游側 具備隔膜式之緩衝閥19。於該緩衝閥19中，增減吸氣通路 面積之活基閥19a施力於關閉側。又，活塞閥i %連接於隔 膜19b，且以將吸氣通路9〇之負壓導入至隔膜室i9c内之方 式構成。藉由具備此種緩衝閥19，於急劇打開節氣閥9之情 形時，活塞閥19a稍微延遲打開吸氣通路9〇，使空氣量之增 加符合於燃料噴射量之增加，藉此引擎可順暢地旋轉上升。 又，於圖4所示之例中，以實質性位於空氣淨化器盒丨丨之 97328.doc -19- 1275707 外側之方式配置燃料喷射器M，且 於空氣淨# % + 更貰射噴嘴14c部分突出 於工乱乎化态盒丨丨内，故而可 修性。 门九，、枓贺射器14之檢查維 圖8及圖9係用以說明其他燃 ㈤、辦衣置之圖。此處，盥 圖2及圖4相同之符號表示相同或相人… /、 m ^ ^ 田w刀。本燃料供給裝 置係將上游側燃料喷射器14 士士々士 1孓工虱净化器盒11内且於 主抓之中心線Μ之内側(圓弧形狀之中心側)之例 各燃料噴射器14支撐於筒狀之支擇托架15 "。該 15，，貫通空氣淨化哭各u之产士加辟 文仅托木 八"Β —11之左右側壁。該貫通部分藉由下側 i 1 la及上側盒丨lb之法蘭部 产少 八灯以大乳不侵入至空 氣淨化器内之方式密封。 广然料喷射器14於插入於支樓托架15 ”之輪較㈣之狀 悲下得以固定，且喷射噴嘴14e突出於下方。又，於各燃料 贺射器14之上端連接有通用之燃料供給管16，燃料供給管 16之端部突出於空氣淨化器盒u之外方，該突出部連接於 燃料，給果（未圖示）。以此方式’四個燃料喷射㈣與燃料 供給管16及電力供給配線一併安裝於支撐托架^"，得以一 體化，藉此構成噴射器單元。 產業上之可利用性 如上所述，本發明於引擎之燃料供給裝置及具備其之車 輛方面有用。 【圖式簡單說明】 圖1係本發明之實施形態之機車之側面圖。 圖2係本發明之實施形態之燃料供給裝置的剖面圖 97328.doc -20- 1275707 圖3係圖2之ΙΙΙ-ΠΙ線剖面圖。 圖4係本發明之其他實施形態之燃料供給裝置的剖面圖。 圖5係上述實施形態之通風井之剖面圖。 圖6係圖5之VI _ VI線剖面圖。 圖7係表示燃料之舉動之說明圖。 圖8係本發明之其他實施形態之燃料供給裝置的剖面圖。 圖9係上述燃料供給裝置之平面圖。 【主要元件符號說明】 7 節氣閥體 8 通風井（燃料捕捉部） 8a 剝離層誘發部（鐘形嘴） 9 節氣閥 11 空氣淨化器盒 13 下游側燃料喷射器 14 上游側燃料喷射器（喷射器） 14a 噴射流之中心線 14c 喷射喷嘴 90 吸氣通路 a 剝離層 Μ 主流之中心線 97328.doc •21 -The tangent does not cross between the tangent of the cone shape of the ventilation shaft 8. That is, the upstream end of the peeling layer portion 8c is physically connected to the fastest flow rate of 97328.doc 16 1275707. The air flow in the tangential direction is not peeled off from the inner surface by the air flow 'in the inner side of the ventilation shaft 8, and a space in which the air stagnates is formed from the air flow on the inner surface side of the ventilation shaft 8. This space is formed along the inner surface of the ventilation shaft 8 (i.e., annularly in the vicinity of the opening portion of the intake passage 9G) to form (iv) the separation layer & a negative pressure from the flow velocity of the air flow in the tangential direction. In the state in which the peeling layer a is formed, a pulsating wave is generated in the intake passage 9A. When the pulsation wave system starts the inhalation step, the dense air of the air generated from the intake valve opening 2d is opened by the intake valve 4a, and flows backward to the intake passage 90 in the direction in which the suction is applied. When the fuel injected from the downstream fuel injector 13 or the upstream fuel injector 14 flows into the intake passage 90, the fuel is blown back toward the suction port 8b by the pulsation wave. When the blown fuel reaches the suction port of the ventilation shaft 8, it is scattered into the air cleaner 10 from the suction port 8b. However, as described above, a negative pressure is generated in the peeling layer a formed in the vicinity of the suction port, so that the fuel particles which are conveyed through the vicinity of the inner surface of the passage of the intake passage 9 and are blown back are separated as shown in Fig. 7 by peeling off. The layers are sought to capture the vortex. When a large amount of fuel particles are captured by the peeling layer a, the fuel particles wound into the vortex are combined into a droplet shape, passed through the inner surface of the passage of the intake passage 9〇, and supplied to the combustion chamber 2c of the cylinder head 2. Therefore, the fuel is not blown back into the air purge state 10 from the peripheral portion of the suction port 8b. On the other hand, in the central portion of the suction port 8b, the fuel will scatter into the air cleaner 10 (refer to Fig. 7). In this way, the fuel will be blown back in the central portion of the suction port 8b, but the suction port 8b is the open end, so that the propagation direction of the pulsation wave is reversed at the suction port 8b, and the pulse wave is again directed toward the combustion chamber. 2c travels within the inhalation passage 9〇. At the same time, the usual suction in the suction step is performed, and the air and fuel are supplied to the 'combustion chamber 2c by the pulsating wave. Thereby, the improvement of the filling efficiency by the pulsating wave can be realized, and the engine performance can be further improved. In addition, since the time from the generation of the pulsation wave to the inhalation as described above is small, the fuel blown back from the central portion of the suction port 8b to the air cleaner 1 is scattered again before the suction port 8b. Inhalation inhalation. Further, the fuel is not blown back into the air purification unit 10 from the peripheral portion of the suction port 8b. As a result, all of the fuel blown back through the intake passage 90 is again directed toward the combustion chamber 2C. In other words, the blown back fuel is not scattered in the air cleaner 10 but supplied to the combustion chamber 2c. Further, in the present embodiment, since the peeling layer a in which the air stagnates is formed, the actual inner diameter of the ventilation shaft 8 or the throttle body 7 is smaller than the inner diameter of the peeling layer a. In consideration of the case where the peeling layer a is formed, the physical inner diameter D of the through-well 8 or the throttle body 7 is set to be larger than usual. Specifically, the substantial inner diameter when forming the peeling layer a is such that the amount of suction required to ensure the desired output of the engine is sufficient. * Further '^ can consider the narrow inner diameter due to the formation of the peeling layer a. The shape of the wind well 8 or the gp intergas body 7. Regarding the formation of part or all of the blade of the peeling two a, it is preferable to set the physical property to be larger than the other parts: large t. By this treatment, even if the substantial inner diameter of the ventilation well 8 or the like is reduced by the strip layer a, the decrease in the amount of intake air supplied to the combustion chamber 2 can be alleviated. The domain fuel radiator 14 is disposed in such a manner as to devour the fuel toward the release layer & In other words, the fuel injector 14 injects fuel toward the inside of the stripping layer a of the well 98328.doc -18-12755707. In Fig. 4, the symbol indicates the injection axis of the center of the direction in which the fuel injection 14 fuel is injected. The ejection region (indicated by a broken line in Fig. 4) defined by the ejection axis 14a and the specific ejection angle is located further inside the peeling layer a, and the peeling layer & is formed in the suction passage 9'. Thereby, the fuel injected from the fuel injector 14 is not blown out of the suction port 8b of the ventilation well 8, and is not captured by the peeling layer & and flows to the intake passage 9 together with the airflow. Hey. As described above, according to the present embodiment, the peeling layer a is actively formed, and the fuel is ejected from the peeling layer a toward the center side of the intake passage 9A. Therefore, the fuel that is blown back can be prevented from scattering to the outside by the peeling layer a. Further, it is possible to suppress the blowing back of the fuel. Further, in the above embodiment, the peeling layer & is formed only inside the ventilation well 8. However, the peeling layer a may also extend from the ventilation shaft 8 to the joint member 6, or the inside of the throttle body 7. That is, the peeling layer & at least one portion of the opening portion of the intake passage 卯 can be formed, and the length of the air separation direction of the peeling layer & is not particularly limited. Further, in the example shown in Fig. 4, the throttle body 7 is provided with a diaphragm type buffer valve 19 on the upstream side of the throttle valve 9. In the buffer valve 19, the movable base valve 19a that increases or decreases the intake passage area is biased to the closing side. Further, the piston valve i% is connected to the diaphragm 19b, and is configured to introduce the negative pressure of the intake passage 9〇 into the diaphragm chamber i9c. By providing such a cushion valve 19, when the throttle valve 9 is suddenly opened, the piston valve 19a slightly delays opening of the intake passage 9〇, so that the increase in the amount of air is in accordance with the increase in the amount of fuel injection, whereby the engine can smoothly Rotation rises. Further, in the example shown in Fig. 4, the fuel injector M is disposed substantially outside the 97328.doc -19-1275707 of the air purifier cartridge, and the air net #% + is further the nozzle 14c Part of the work is highlighted in the chaos of the box, so it can be repaired. Door 9 and 检查 射 14 14 14 14 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图Here, the same symbols as in Fig. 2 and Fig. 4 indicate the same or opposite person... /, m ^ ^ Field w knife. The present fuel supply device is an example in which the upstream fuel injector 14 is in the inside of the cleaner casing 11 and is located inside the center line of the main grip (the center side of the arc shape). Supported in the cylindrical support bracket 15 ". The 15, the through-air purification of the cries of each of the yokes and literary texts only to the top of the eight " Β -11 left and right side walls. The through portion is sealed by the lower side i 1 la and the flange portion of the upper side cassette lb, so that the large milk does not intrude into the air cleaner. The wide-range ejector 14 is fixed in the shape of the wheel ("four" inserted into the pedestal bracket 15", and the injection nozzle 14e protrudes from below. Further, a common fuel is connected to the upper end of each fuel radiator 14. The supply pipe 16 and the end of the fuel supply pipe 16 protrude beyond the air cleaner case u, and the protrusion is connected to the fuel, and is provided (not shown). In this way, the four fuel injections (four) and the fuel supply pipe 16 and the power supply wiring are integrally attached to the support brackets, and are integrated to constitute the injector unit. INDUSTRIAL APPLICABILITY As described above, the fuel supply device for the engine and the vehicle having the same BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view of a locomotive according to an embodiment of the present invention. Fig. 2 is a cross-sectional view of a fuel supply apparatus according to an embodiment of the present invention. 97328.doc -20-1275707 Fig. 4 is a cross-sectional view of a fuel supply device according to another embodiment of the present invention. Fig. 5 is a cross-sectional view of the ventilation shaft of the above embodiment. Fig. 6 is a sectional view taken along line VI-VI of Fig. 5. Figure 7 shows the fuel Fig. 8 is a cross-sectional view of a fuel supply device according to another embodiment of the present invention. Fig. 9 is a plan view of the fuel supply device. [Description of main components] 7 throttle body 8 ventilation shaft (fuel capture unit) 8a peeling layer inducing portion (bell mouth) 9 throttle valve 11 air cleaner box 13 downstream fuel injector 14 upstream fuel injector (injector) 14a jet flow center line 14c injection nozzle 90 suction passage a peeling Μ Mainstream centerline 97328.doc • 21 -