JP4573771B2 - Fuel supply device for internal combustion engine - Google Patents

Fuel supply device for internal combustion engine Download PDF

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JP4573771B2
JP4573771B2 JP2005368170A JP2005368170A JP4573771B2 JP 4573771 B2 JP4573771 B2 JP 4573771B2 JP 2005368170 A JP2005368170 A JP 2005368170A JP 2005368170 A JP2005368170 A JP 2005368170A JP 4573771 B2 JP4573771 B2 JP 4573771B2
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fuel
cylindrical portion
injection valve
supply device
throttle
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JP2007170256A (en
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靖史 近藤
博 菊池
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Keihin Corp
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本発明は、内燃機関に向けて制御された燃料を供給する燃料供給装置に関する。   The present invention relates to a fuel supply device that supplies controlled fuel toward an internal combustion engine.

内燃機関に燃料を供給する燃料供給装置は、気化器を用いる気化器方式を燃料噴射弁を用いる燃料噴射方式とがある。
気化器方式は、燃料噴射方式に比較して長く使用されてきたものであり、燃料噴射方式はここ４０年位の間に多用されてきたものである。
気化器方式に用いられる気化器は、例えば特開平７−２７９７７０号公報等に示される定真空式気化器が用いられるもので、特に二輪車にあっては、かかる定真空式気化器が広く採用される。
定真空式気化器は、他のバタフライ型気化器、摺動絞り弁型気化器に比較して特徴的な構造を有するもので、以下図２によって定真空式気化器について説明する。
３０は、内部を吸気通路３１が側方に貫通して穿設された気化器本体であり、吸気通路３１は、気化器本体３０に回転自在に支持された絞り弁軸３２に取着された絞り弁３３によって開閉される。
気化器本体３０の上部には、上方に向かって有底カップ状をなす第１筒状部３０ａが開口して形成されるもので、第１筒状部３０ａの上方開口は有底カップ状をなすトップカバー３４によって閉塞される。
以上によると、第１筒状部３０ａとトップカバー３４とによって閉塞されたダイヤフラム室Ｆが気化器本体３０の上部に上方に向けて突出して形成される。
ここで前記第１筒状部３０ａの底部には吸気通路３１内に向けて摺動絞り弁案内筒３５が穿設されるとともに絞り弁３３より上流側の吸気通路３１ａに向けて大気導入路３６が穿設される。
又、気化器本体３０の下部には、下方に向かって有底カップ状をなす第２筒状部３０ｂが開口して形成されるもので、第２筒状部３０ｂの下方開口は、有底カップ状をなすチャンバー体３７によって閉塞される。
以上によると、第２筒状部３０ｂとチャンバー体３７とによって閉塞された浮子室３８が気化器本体３０の下部に下方に向けて突出して形成される。
ここで、前記摺動絞り弁案内には、吸気通路３１を横断して、吸気通路３１を開閉する負圧作動弁３９が移動自在に配置されるもので、負圧作動弁３９のダイヤフラム室Ｆ内に突出する上端部には環状をなすダイヤフラム４０の環状をなす内径部分がワッシャーを介してカシメ結合され、ダイヤフラム４０の環状をなす外径部分が第１筒状部３０ａの上端鍔部３０ａ１とトップカバー３４の下端鍔部３４ａとの間に挟持されて固定される。
以上によると、ダイヤフラム室Ｆは、第１筒状部３０ａとダイヤフラム４０の下側面部とにより大気導入路３６を介して大気が導入される大気室４１が形成され、トップカバー３４とダイヤフラム４０の上側面部とにより、負圧作動弁３９の負圧孔３９ａを介して吸気負圧が導入される受圧室４２が形成される。
一方、浮子室３８内には、図示せぬ燃料タンクに連絡される燃料流入路の端部に配置されたバルブシート、バルブシートを閉塞するフロートバルブ、及びフロートバルブを開閉動作するフロート４３が配置されるもので、前記バルブシート、フロートバルブ、フロート４３の協同作用によって浮子室３８内には常に一定なる燃料液面Ｘ−Ｘが形成される。（バルブシート、フロートバルブは図示されていない）
又、チャンバー体３７の底部にはドレンプラグ４４が螺着されるもので、ドレンプラグ４４をユルメることによりドレン孔４５より浮子室３８内の燃料を外部へ排出できる。
かかる燃料の排出は、内燃機関の長期に渡る不使用時、気化器のメンテナンス時において用いられる。
尚、Ｍは、ニードルジェット４６、ミキシングノズル４７、メーンジェット４８よりなる主燃料系統であり、ニードルジェット４６の上端は吸気通路３１内に開口し、メーンジェット４８は、浮子室３８内の燃料液面下に配置される。
又、Ｓはバイパス孔４９、スロージェット等よりなる低速燃料系統である。（スロージェットは図示されていない）
以上によると、機関に向けて供給される空気量は、運転者によって操作される絞り弁３３が吸気通路３１を開閉し、その開口に応じて供給され、一方、機関に向けて供給される燃料量は、吸気通路３１内を流れる空気流れによって生ずる負圧に応じてバイパス孔４９よりなる低圧燃料系統Ｓ、ニードルジェット４６よりなる主燃料系統Ｍより吸気通路３１内に吸出されて供給される。 2. Description of the Related Art A fuel supply apparatus that supplies fuel to an internal combustion engine includes a carburetor system that uses a carburetor and a fuel injection system that uses a fuel injection valve.
The carburetor method has been used for a long time compared to the fuel injection method, and the fuel injection method has been widely used in the last 40 years.
As the vaporizer used in the vaporizer system, for example, a constant vacuum type vaporizer disclosed in Japanese Patent Application Laid-Open No. 7-279770 is used. Especially in a motorcycle, such a constant vacuum type vaporizer is widely adopted. The
The constant vacuum type vaporizer has a characteristic structure as compared with other butterfly type vaporizers and sliding throttle type vaporizers. The constant vacuum type vaporizer will be described below with reference to FIG.
Reference numeral 30 denotes a carburetor main body having an intake passage 31 penetrating laterally therethrough, and the intake passage 31 is attached to a throttle valve shaft 32 that is rotatably supported by the carburetor main body 30. The throttle valve 33 is opened and closed.
The upper part of the vaporizer body 30 is formed by opening a first cylindrical part 30a having a bottomed cup shape upward, and the upper opening of the first cylindrical part 30a has a bottomed cup shape. The top cover 34 is closed.
According to the above, the diaphragm chamber F closed by the first tubular portion 30 a and the top cover 34 is formed to protrude upward from the upper portion of the vaporizer body 30.
Here, a sliding throttle valve guide cylinder 35 is bored into the intake passage 31 at the bottom of the first cylindrical portion 30a, and an air introduction path 36 toward the intake passage 31a upstream of the throttle valve 33. Is drilled.
In addition, a lower cylindrical portion 30b having a bottomed cup shape is formed in the lower portion of the vaporizer body 30 so as to open downward. The lower opening of the second cylindrical portion 30b has a bottomed shape. It is closed by a chamber body 37 having a cup shape.
According to the above, the floating chamber 38 closed by the second cylindrical portion 30b and the chamber body 37 is formed projecting downward at the lower portion of the vaporizer body 30.
Here, in the sliding throttle valve guide, a negative pressure operating valve 39 that opens and closes the intake passage 31 is movably disposed across the intake passage 31, and a diaphragm chamber F of the negative pressure operating valve 39 is provided. An annular inner diameter portion of the diaphragm 40 is crimped to the upper end portion protruding inward through a washer, and an outer diameter portion of the diaphragm 40 is connected to the upper end flange 30a1 of the first tubular portion 30a. It is clamped and fixed between the lower end flange 34a of the top cover 34.
According to the above, in the diaphragm chamber F, the atmosphere chamber 41 into which the atmosphere is introduced through the atmosphere introduction path 36 is formed by the first cylindrical portion 30a and the lower side surface portion of the diaphragm 40, and the top cover 34 and the diaphragm 40 are A pressure receiving chamber 42 into which intake negative pressure is introduced through the negative pressure hole 39a of the negative pressure operating valve 39 is formed by the upper side surface portion.
On the other hand, in the float chamber 38, a valve seat disposed at an end portion of a fuel inflow passage connected to a fuel tank (not shown), a float valve for closing the valve seat, and a float 43 for opening and closing the float valve are disposed. It intended to be, before Fang Rubushito, float valve, fuel level X-X to always constant in the float chamber 38 by the cooperative action of the float 43 is formed. (The valve seat and float valve are not shown)
Further, a drain plug 44 is screwed to the bottom of the chamber body 37, and the fuel in the float chamber 38 can be discharged to the outside from the drain hole 45 by swelling the drain plug 44.
Such fuel discharge is used when the internal combustion engine is not used for a long period of time or during maintenance of the carburetor.
M is a main fuel system comprising a needle jet 46, a mixing nozzle 47, and a main jet 48. The upper end of the needle jet 46 opens into the intake passage 31, and the main jet 48 is a fuel liquid in the float chamber 38. Located below the surface.
S is a low-speed fuel system comprising a bypass hole 49, a slow jet, and the like. (The slow jet is not shown)
According to the above, the amount of air supplied to the engine is supplied in accordance with the opening of the throttle valve 33 operated by the driver to open and close the intake passage 31, while the fuel supplied to the engine. The quantity is sucked into the intake passage 31 from the low pressure fuel system S formed by the bypass hole 49 and the main fuel system M formed by the needle jet 46 in accordance with the negative pressure generated by the air flow flowing in the intake passage 31.

次に燃料噴射方式において使用されるスロットルボデーについて図３により説明する。５０は内部を吸気通路５１が貫通して穿設されたスロットルボデーであり、吸気通路５１は、スロットルボデー５０に回転自在に支持された絞り弁軸５２に取着された絞り弁５３によって開閉される。
燃料噴射弁Ｊはスロットルボデー５０の上部に固定配置されるもので、燃料噴射弁Ｊの先端Ｊａがスロットルボデー５０に穿設された燃料噴射弁挿入孔５０ａ内に挿入され、燃料噴射弁Ｊの後端Ｊｂに燃料分配管５４のガイド孔５４ａが挿入され、かかる状態で燃料分配管５４がスロットルボデー５０にネジ５５によって螺着される。
尚、５４ｂは燃料分配管５４内に穿設された燃料流入路であり、この燃料流１路５４ｂは燃料ポンプに燃料配管をもって接続される。５６は燃料噴射弁Ｊに一体形成されたカプラ５７に電気接続され、外部電源に連なるリード線５６ａを備えるコネクタである。
以上によると、機関に向けて供給される空気量は、絞り弁５２が吸気通路５１を開閉し、その開口に応じて供給され、一方機関に向けて供給される燃料量は、ＥＣＵからの出力信号に応じて動作する燃料噴射弁Ｊによって制御されて供給される。
特開平７−２７９７７０号公報 Next, a throttle body used in the fuel injection system will be described with reference to FIG. Reference numeral 50 denotes a throttle body having an intake passage 51 formed therethrough. The intake passage 51 is opened and closed by a throttle valve 53 attached to a throttle valve shaft 52 rotatably supported by the throttle body 50. The
The fuel injection valve J is fixedly arranged on the upper portion of the throttle body 50, and the tip Ja of the fuel injection valve J is inserted into a fuel injection valve insertion hole 50a formed in the throttle body 50. A guide hole 54a of the fuel distribution pipe 54 is inserted into the rear end Jb, and the fuel distribution pipe 54 is screwed to the throttle body 50 with a screw 55 in this state.
Reference numeral 54b denotes a fuel inflow passage formed in the fuel distribution pipe 54. This fuel flow passage 54b is connected to the fuel pump through a fuel pipe. A connector 56 is electrically connected to a coupler 57 formed integrally with the fuel injection valve J and includes a lead wire 56a connected to an external power source.
According to the above, the amount of air supplied to the engine is supplied according to the opening of the throttle valve 52 that opens and closes the intake passage 51, while the amount of fuel supplied to the engine is output from the ECU. It is controlled and supplied by a fuel injection valve J that operates in response to a signal.
JP 7-279770 A

上述の如く、内燃機関における燃料供給方式は図２に示される気化器方式としての気化器及び図３に示される燃料噴射装置としてのスロットルボデーの二種類があり、二輪車において気化器からスロットルボデーへと燃料供給方式を変更した際、下記の問題を有する。
すなわち、図２、図３によって明らかな如く、気化器とスロットルボデーとを比較すると、その外観形状は著しく異なるもので、特に二輪車の如く燃料供給装置が外部に大きく露出して配置されるものにあっては、二輪車の外観形状（デザイン）が大きく変化することになり、外観形状が特に重要視されるレトロ感覚の二輪車において受けいれがたいものであった。又燃料供給装置を含む二輪車の外観形状を新規にすることが考慮されるが、これには多大な開発投資を必要とするものであった。 As described above, there are two types of fuel supply systems in the internal combustion engine, the carburetor as the carburetor system shown in FIG. 2 and the throttle body as the fuel injection device shown in FIG. 3, and from a carburetor to a throttle body in a motorcycle. When the fuel supply system is changed, the following problems occur.
That is, as apparent from FIG. 2 and FIG. 3, when the carburetor and the throttle body are compared, their external shapes are remarkably different. In particular, the fuel supply device such as a two-wheeled vehicle is arranged so as to be exposed greatly. In that case, the appearance shape (design) of the two-wheeled vehicle would change greatly, and it was unacceptable for a retro-like two-wheeled vehicle in which the appearance shape was particularly important. In addition, it is considered that the two-wheeled vehicle including the fuel supply device has a new appearance, but this requires a great investment in development.

本発明は上記不具合に鑑み成されたもので、従来の定真空式気化器を採用する二輪車に対し、車輌の外観形状（デザイン）が変わることなく燃料噴射弁付きのスロットルボデーを搭載することのできる燃料供給装置を提供することを目的とする。 The present invention has been made in view of the above-mentioned problems, and it is possible to mount a throttle body with a fuel injection valve on a two-wheeled vehicle employing a conventional constant vacuum type carburetor without changing the external shape (design) of the vehicle. It is an object of the present invention to provide a fuel supply device that can be used.

本発明になる内燃機関における燃料供給装置は、前記目的を達成する為に、絞り弁により開閉される水平方向の吸気通路を有するスロットルボデーの上面に、上方に向かって開口する第１筒状部を一体に突設するとともに、この第１筒状部内から絞り弁より下流の吸気通路に向かって開口する噴射弁挿入孔をスロットルボデーに設け、前記第１筒状部の上端に、その上方開口を閉鎖するトップカバーを接合し、またスロットルボデーの下面に、下方に向かって開口する第２筒状部を一体に突設し、この第２筒状部の下端に、その下方開口を閉鎖するトップカバーを接合し、前記噴射弁挿入孔に装着されて前記吸気通路に燃料を噴射し得る燃料噴射弁を前記第１筒状部内に収容し、前記第１筒状部内において前記燃料噴射弁のカプラにコネクタを嵌合するとともに、このコネクタから延びるリード線を前記第１筒状部及トップカバーの接合面間より外部に引出したことを第１の特徴とする。 In order to achieve the above object, a fuel supply device for an internal combustion engine according to the present invention has a first cylindrical portion that opens upward on the upper surface of a throttle body having a horizontal intake passage that is opened and closed by a throttle valve. And an injection valve insertion hole that opens from the inside of the first cylindrical portion toward the intake passage downstream of the throttle valve is provided in the throttle body, and an upper opening is provided at the upper end of the first cylindrical portion. A top cover that closes the cylinder is joined, and a second cylindrical portion that opens downward is integrally provided on the lower surface of the throttle body, and the lower opening is closed at the lower end of the second cylindrical portion. A top cover is joined, and a fuel injection valve that is attached to the injection valve insertion hole and can inject fuel into the intake passage is accommodated in the first cylindrical portion, and the fuel injection valve is disposed in the first cylindrical portion. Connector to coupler With fitted, to that drawn out lead wire extending from the connector to the outside from between the joint surface of the first cylindrical portion及top cover and the first feature.

又、本発明は前記第１の特徴に加え、前記第１及び第２筒状部の内部間を水抜き通路にて連通するとともに、その第２筒状部内を大気に開放する水抜き孔を前記チャンバ体に設けたことを第２の特徴とする。 According to the present invention, in addition to the first feature, a drain hole for communicating between the interiors of the first and second cylindrical portions through a drain passage and opening the second cylindrical portion to the atmosphere. A second feature is that the chamber body is provided .

本発明の第１の特徴によると、スロットルボデーの上部に、第１筒状部とトップカバーとにより、定真空式気化器のダイヤフラム室に相当する上方空間部が形成され、スロットルボデーの下部に、第２筒状部とチャンバー体とにより、定真空式気化器の浮子室に相当する下方空間部が形成される。一方燃料噴射弁は上方空間部内に配置され、燃料噴射弁より絞り弁の下流側の吸気通路に向けて燃料を噴射供給できる。
而して、燃料噴射弁付きのスロットルボデー、トップカバー及びチャンバ体の外観形状を従来の定真空式気化器の外観と同一形状とすることができ、燃料噴射式燃料供給装置を搭載した二輪車の外観形状を従来の定真空式気化器を搭載した二輪車の外観形状と同一とすることができ、特にレトロ感覚の二輪車において好適なものである。 According to the first feature of the present invention, an upper space portion corresponding to the diaphragm chamber of the constant vacuum type carburetor is formed at the upper portion of the throttle body by the first tubular portion and the top cover, and is formed at the lower portion of the throttle body. The lower cylindrical portion corresponding to the float chamber of the constant vacuum type vaporizer is formed by the second cylindrical portion and the chamber body. On the other hand, the fuel injection valve is arranged in the upper space, and can inject and supply fuel toward the intake passage downstream of the throttle valve from the fuel injection valve.
Thus, the external shape of the throttle body with the fuel injection valve, the top cover, and the chamber body can be the same as that of the conventional constant vacuum carburetor, and the two-wheeled vehicle equipped with the fuel injection type fuel supply device can be used. The external shape can be made the same as the external shape of a two-wheeled vehicle equipped with a conventional constant vacuum type vaporizer, and is particularly suitable for a retro-like motorcycle.

又、本発明の第２の特徴によると、第１筒状部及びトップカバー間のリード線引出し部等から第１筒状部内に水滴が浸入した場合でも、その水滴を水抜き通路、及び水抜き孔を介して外部に即座に排出することができ、したがって特に第１筒状部内に配置される燃料噴射弁のカプラとコネクタの電気接続部に水滴による腐蝕が発生することなく長期に渡って安定した性能を維持できる。 Further, according to the second feature of the present invention, even when a water droplet enters the first tubular portion from the lead wire leading portion between the first tubular portion and the top cover, the water droplet is removed from the drain passage and the water. It can be immediately discharged to the outside through the hole , and therefore , the electrical connection between the coupler and the connector of the fuel injection valve disposed in the first cylindrical portion is not corroded by water droplets for a long period of time. Stable performance can be maintained.

以下、本発明になる燃料供給装置の一実施例について図１により説明する。
１は内部を水平方向に吸気通路２が貫通して穿設されたスロットルボデーであり、吸気通路２は、スロットルボデー１に回転自在に支持された絞り弁軸３に取着された絞り弁４によって開閉される。
スロットルボデー１の上面には、上方に向かって開口する有底カップ状の第１筒状部１ａが一体に突設されるもので、この第１筒状部１ａの上方開口は、第１筒状部１ａの上端に接合される有底カップ状をなすトップカバー５によって閉鎖される。以上によると、第１筒状部１ａとトップカバー５とにより閉鎖された上方空間部６が形成されるもので、かかる上方空間部６は、図２の定真空式気化器において、気化器本体３０の上部に形成されるダイヤフラム室Ｆと同外観形状に形成できる。
すなわち、気化器本体３０に相当するスロットルボデー１の上部に、気化器のダイヤフラム室Ｆに相当する上方空間部６が形成される。
又、スロットルボデー１の下面には下方に向かって開口する有底カップ状をなす第２筒状部１ｂが一体に突設されるもので、この第２筒状部１ｂの下方開口は、第２筒状部１ｂの下端に接合される有底カップ状をなすチャンバー体７によって閉鎖される。
以上によると第２筒状部１ｂとチャンバー体７とにより閉鎖された下方空間部８が形成されるもので、かかる下方空間部８は、図２の定真空式気化器において気化器本体３０の下部に形成される浮子室３８と同外観形状に形成できる。
すなわち、気化器本体３０に相当するスロットルボデー１の下部に、気化器の浮子室３２に相当する下方空間部８が形成される。 An embodiment of the fuel supply apparatus according to the present invention will be described below with reference to FIG.
Reference numeral 1 denotes a throttle body having an intake passage 2 penetrating therethrough in a horizontal direction. The intake passage 2 is attached to a throttle valve shaft 3 that is rotatably supported by the throttle body 1. Is opened and closed by.
On the upper surface of the throttle body 1, a bottomed cup-shaped first cylindrical portion 1a that opens upward is integrally projected, and the upper opening of the first cylindrical portion 1a is the first cylinder. It is closed by a top cover 5 having a bottomed cup shape joined to the upper end of the shaped portion 1a . According to the above, the upper space portion 6 closed by the first cylindrical portion 1a and the top cover 5 is formed, and the upper space portion 6 is the vaporizer body in the constant vacuum type vaporizer of FIG. It can be formed in the same external shape as the diaphragm chamber F formed in the upper part of 30.
That is, an upper space portion 6 corresponding to the diaphragm chamber F of the carburetor is formed on the upper portion of the throttle body 1 corresponding to the carburetor body 30.
Further, the lower surface of the throttle body 1 in which the second cylindrical portion 1b which forms the shaped bottom cup which opens downward is integrally projecting, lower opening of the second cylindrical portion 1b is It is closed by a chamber body 7 having a bottomed cup shape joined to the lower end of the second cylindrical portion 1b .
According to the above, the lower space part 8 closed by the second cylindrical part 1b and the chamber body 7 is formed, and the lower space part 8 is formed in the constant vacuum type vaporizer of FIG. It can be formed in the same external shape as the floating chamber 38 formed in the lower part.
That is, a lower space portion 8 corresponding to the float chamber 32 of the carburetor is formed below the throttle body 1 corresponding to the carburetor body 30.

そして、前記上方空間部内には燃料噴射弁Ｊが以下によって収納配置される。
燃料噴射弁Ｊの先端部Ｊａは、上方空間部６から絞り弁４より下流側の吸気通路２ａ内に向かって開口して穿設された噴射弁挿入孔１ｃに挿入され、その後端部Ｊｂは、燃料分配管９の燃料分配管９ａに連なる噴射弁挿入孔９ｂに挿入され、かかる状態において燃料分配管９の鍔部９ｃがビス１０によってスロットルボデー１に螺着される。
以上によると、燃料噴射弁Ｊはスロットルボデー１と燃料分配管９とによって挟持されて固定される。
又、燃料噴射弁Ｊに設けたカプラＪｃは、上方空間部６内においてコネクタ１１と嵌合されて電気接続され、コネクタ１１からのびるリード線１１ａは、第１筒状部１ａの上端面に穿設された溝１ｄを介して上方空間部６の外方へ引出され、リード線１１ａの外側端に形成されるカプラが外部電源に接続される。
尚、燃料流入路９ａもまた第１筒状部１ａに貫通して穿設された孔を介して上方空間部６の外方へ引出され、図示せぬ燃料ポンプに燃料配置をもって接続される。 A fuel injection valve J is accommodated in the upper space portion as follows.
The front end portion Ja of the fuel injection valve J is inserted into the injection valve insertion hole 1c opened from the upper space portion 6 toward the intake passage 2a downstream of the throttle valve 4, and the rear end portion Jb is The fuel distribution pipe 9 is inserted into the injection valve insertion hole 9 b connected to the fuel distribution pipe 9 a, and in this state, the flange portion 9 c of the fuel distribution pipe 9 is screwed to the throttle body 1 with the screw 10.
According to the above, the fuel injection valve J is sandwiched and fixed by the throttle body 1 and the fuel distribution pipe 9.
Further, the coupler Jc provided in the fuel injection valve J is fitted and electrically connected to the connector 11 in the upper space portion 6, and the lead wire 11a extending from the connector 11 penetrates the upper end surface of the first cylindrical portion 1a. A coupler formed at the outer end of the lead wire 11a is connected to an external power source by being pulled out of the upper space 6 through the provided groove 1d.
The fuel inflow passage 9a is also drawn out of the upper space 6 through a hole penetrating through the first tubular portion 1a and connected to a fuel pump (not shown) with fuel arrangement.

更に、上方空間部６の底部と下方空間部８とは水抜き通路１２をもって連通され、下方空間部８の底部と大気とは水抜き孔１３をもって連通される。 Furthermore, the bottom and the lower space 8 of the upper space 6 is communicated with the drain passage 12, and the bottom portion and the atmosphere of the lower space 8 is communicated with a drain hole 13.

以上によると、運転者によって絞り弁４が吸気通路２を開放すると、その開放に応じた空気が内燃機関に向けて供給され、一方、燃料噴射弁Ｊは、図示せぬＥＣＵから噴射信号に基き燃料の制御が行なわれるもので、この燃料は燃料噴射弁Ｊの先端に設けた噴孔、絞り弁４より下流側の吸気通路２ａを介して内燃機関に供給され、もって内燃機関の運転が行なわれる。   According to the above, when the throttle valve 4 opens the intake passage 2 by the driver, air corresponding to the opening is supplied to the internal combustion engine, while the fuel injection valve J is based on an injection signal from an ECU (not shown). The fuel is controlled, and this fuel is supplied to the internal combustion engine via the injection hole provided at the tip of the fuel injection valve J and the intake passage 2a on the downstream side of the throttle valve 4, thereby operating the internal combustion engine. It is.

ここで、本発明になる燃料供給装置によると、気化器の気化器本体に相当するスロットルボデー１の上部に、気化器のダイヤフラム室に相当する上方空間部６が上方に向けて突出して形成され、スロットルボデー１の下部に気化器の浮子室に相当する下方空間部８を下方に向けて突出して形成したので、スロットルボデー１、トップカバー５及びチャンバ体７の外観形状を従来の定真空式気化器の外観形状と同一形状とすることができたものである。
以上によると、燃料供給装置として定真空式気化器を採用していた二輪車に対して、定真空式気化器を本発明の前記スロットルボデーに変更した際にあっても、燃料供給装置としての外観形状が何等変わることがないので、燃料供給装置を含む二輪車の外観形状を従前の外観形状に維持することができ、特にレトロ感覚が好まれる二輪車において好適である。
又、燃料供給装置の収納スペースは従来の気化器のスペースをそのまま活用できるので燃料供給装置の収納スペースのレイアウト設計が全く不要となるものである。 Here, according to the fuel supply device of the present invention, the upper space portion 6 corresponding to the diaphragm chamber of the carburetor is formed so as to protrude upward at the upper portion of the throttle body 1 corresponding to the carburetor body of the carburetor. Since the lower space portion 8 corresponding to the buoyancy chamber of the carburetor protrudes downward from the lower portion of the throttle body 1, the external shape of the throttle body 1, the top cover 5 and the chamber body 7 is the same as that of the conventional constant vacuum type. This is the same shape as the external shape of the vaporizer.
According to the above, even when the constant vacuum type carburetor is changed to the throttle body of the present invention with respect to the motorcycle that has adopted the constant vacuum type carburetor as the fuel supply device, the appearance as the fuel supply device Since the shape does not change at all, the appearance shape of the two-wheeled vehicle including the fuel supply device can be maintained at the conventional appearance shape, which is particularly suitable for a two-wheeled vehicle in which a retro sense is preferred.
Further, since the storage space of the fuel supply device can utilize the space of the conventional carburetor as it is, the layout design of the storage space of the fuel supply device is completely unnecessary.

一方、上方空間部６内に配置される燃料噴射弁Ｊは、その内部に電磁コイルを備えるもので、これによると電磁コイルに発生する熱によって上方空間部６内に露、水滴が付着することがあるが、これらの水滴は、水抜き通路１２、下方空間部８、水抜き孔１３を介して大気へ排出することができ、上方空間部６内に水滴が残留したり、飽和状態の水蒸気を存在させることがない。
以上によると、特に燃料噴射弁ＪのカプラＪｃとコネクタ１１の電気接続部の腐蝕を抑止でき、長期に渡って安定した燃料制御を実施できる。
又、二輪車にあっては燃料供給装置は直接大気に露出して配置され、例えばリード線１１ａが挿通される溝１ｄ、燃料流入路９ａが挿通される第１筒状部１ａに穿設される挿通孔（図示されていない）を通して上方空間部６内に水が侵入した際にあっても前記により上方空間部６内の水を即座に外部に排出できる。 On the other hand, the fuel injection valve J disposed in the upper space portion 6 includes an electromagnetic coil therein, and according to this, dew and water droplets adhere to the upper space portion 6 due to heat generated in the electromagnetic coil. However, these water droplets can be discharged to the atmosphere through the water drain passage 12, the lower space portion 8, and the water drain hole 13, and water droplets remain in the upper space portion 6 or saturated water vapor. Never exist.
According to the above, it is possible to suppress corrosion of the electrical connection portion between the coupler Jc of the fuel injection valve J and the connector 11 and to perform stable fuel control over a long period of time.
Further, in the motorcycle, the fuel supply device is directly exposed to the atmosphere, and is, for example, formed in the groove 1d through which the lead wire 11a is inserted and the first cylindrical portion 1a through which the fuel inflow passage 9a is inserted. Even when water enters the upper space portion 6 through an insertion hole (not shown), the water in the upper space portion 6 can be immediately discharged to the outside.

尚、下方空間部８については、単に空間を形成することから一見無用にみえるが、チャンバー体７を廃止することは定真空式気化器の外観形状と大きく相違することになり、前記目的を達成することができない。   The lower space portion 8 is seemingly useless because it simply forms a space, but the abolition of the chamber body 7 is greatly different from the external shape of the constant vacuum type vaporizer, thereby achieving the object. Can not do it.

本発明になる内燃機関における燃料供給装置の一実施例を示す要部縦断面図。The principal part longitudinal cross-sectional view which shows one Example of the fuel supply apparatus in the internal combustion engine which becomes this invention. 従来の気化器方式に用いられる定真空式気化器を示す縦断面図。The longitudinal cross-sectional view which shows the constant vacuum type vaporizer used for the conventional vaporizer system. 従来の燃料噴射方式に用いられるスロットルボデーを示す縦断面図。The longitudinal cross-sectional view which shows the throttle body used for the conventional fuel-injection system.

１ スロットルボデー
１ａ 第１筒状部
１ｂ 第２筒状部
２ 吸気通路
４ 絞り弁
５ トップカバー
６ 上方空間部
７ チャンバー体
８ 下方空間部
１１ コネクタ
１１ａ リード線
１２ 水抜き通路
１３ 水抜き孔
Ｊ 燃料噴射弁
Ｊｃ カプラ DESCRIPTION OF SYMBOLS 1 Throttle body 1a 1st cylindrical part 1b 2nd cylindrical part 2 Intake passage 4 Throttle valve 5 Top cover 6 Upper space part 7 Chamber body 8 Lower space part
11 Connector
11a Lead wire 12 Drain passage 13 Drain hole
J Fuel injection valve
Jc coupler

Claims (2)

絞り弁（４）により開閉される水平方向の吸気通路（２）を有するスロットルボデー（１）の上面に、上方に向かって開口する第１筒状部（１ａ）を一体に突設するとともに、この第１筒状部（１ａ）内から絞り弁（４）より下流の吸気通路（２）に向かって開口する噴射弁挿入孔をスロットルボデー（１）に設け、前記第１筒状部（１ａ）の上端に、その上方開口を閉鎖するトップカバー（５）を接合し、またスロットルボデー（１）の下面に、下方に向かって開口する第２筒状部（１ｂ）を一体に突設し、この第２筒状部（１ｂ）の下端に、その下方開口を閉鎖するトップカバー（５）を接合し、
前記噴射弁挿入孔（１ｃ）に装着されて前記吸気通路（２）に燃料を噴射し得る燃料噴射弁（Ｊ）を前記第１筒状部（１ａ）内に収容し、
前記第１筒状部（１ａ）内において前記燃料噴射弁（Ｊ）のカプラ（Ｊｃ）にコネクタ（１１）を嵌合するとともに、このコネクタ（１１）から延びるリード線（１１ａ）を前記第１筒状部（１ａ）及トップカバー（５）の接合面間より外部に引出したことを特徴とする内燃機関における燃料供給装置。 On the upper surface of the throttle body (1) having a horizontal intake passage (2) opened and closed by the throttle valve (4), a first tubular portion (1a) that opens upward is integrally projected, The throttle body (1) is provided with an injection valve insertion hole that opens from the inside of the first cylindrical portion (1a) toward the intake passage (2) downstream of the throttle valve (4), and the first cylindrical portion (1a The top cover (5) that closes the upper opening is joined to the upper end of the upper body), and the second cylindrical part (1b) that opens downward is integrally projected on the lower surface of the throttle body (1). The top cover (5) for closing the lower opening is joined to the lower end of the second cylindrical portion (1b),
A fuel injection valve (J) that is mounted in the injection valve insertion hole (1c) and can inject fuel into the intake passage (2) is accommodated in the first tubular portion (1a).
A connector (11) is fitted into a coupler (Jc) of the fuel injection valve (J) in the first cylindrical portion (1a), and a lead wire (11a) extending from the connector (11) is connected to the first cylindrical portion (1a). A fuel supply device for an internal combustion engine, wherein the fuel supply device is pulled out from between the joint surfaces of the cylindrical portion (1a) and the top cover (5) . 前記第１及び第２筒状部（１ａ，１ｂ）の内部間を水抜き通路（１２）にて連通するとともに、その第２筒状部（１ｂ）内を大気に開放する水抜き孔（１３）を前記チャンバ体（７）に設けたことを特徴とする請求項１記載の内燃機関における燃料供給装置。 The interior of the first and second cylindrical portions (1a, 1b) communicates with the drainage passage (12), and the drainage hole (13) opens the interior of the second cylindrical portion (1b) to the atmosphere. The fuel supply device for an internal combustion engine according to claim 1 , wherein the chamber body is provided in the chamber body .
JP2005368170A 2005-12-21 2005-12-21 Fuel supply device for internal combustion engine Expired - Fee Related JP4573771B2 (en)

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JP2010031774A (en) * 2008-07-30 2010-02-12 Mikuni Corp Fuel supply system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07279770A (en) * 1994-04-05 1995-10-27 Keihin Seiki Mfg Co Ltd Negative pressure actuating valve in constant vacuum type carburetor
JPH08232814A (en) * 1995-02-28 1996-09-10 Suzuki Motor Corp Fuel injection device for internal combustion engine
JP2002256895A (en) * 2001-03-05 2002-09-11 Yamaha Motor Co Ltd Throttle control device for engine
JP2004076728A (en) * 2003-07-07 2004-03-11 Honda Motor Co Ltd Engine for motorcycle
JP2005171787A (en) * 2003-12-08 2005-06-30 Keihin Corp Throttle valve control device
JP2006112314A (en) * 2004-10-14 2006-04-27 Keihin Corp Throttle body for fuel injection device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07279770A (en) * 1994-04-05 1995-10-27 Keihin Seiki Mfg Co Ltd Negative pressure actuating valve in constant vacuum type carburetor
JPH08232814A (en) * 1995-02-28 1996-09-10 Suzuki Motor Corp Fuel injection device for internal combustion engine
JP2002256895A (en) * 2001-03-05 2002-09-11 Yamaha Motor Co Ltd Throttle control device for engine
JP2004076728A (en) * 2003-07-07 2004-03-11 Honda Motor Co Ltd Engine for motorcycle
JP2005171787A (en) * 2003-12-08 2005-06-30 Keihin Corp Throttle valve control device
JP2006112314A (en) * 2004-10-14 2006-04-27 Keihin Corp Throttle body for fuel injection device

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