JP2008261340A - Fuel injection device for backbone type motorcycle - Google Patents

Fuel injection device for backbone type motorcycle Download PDF

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Publication number
JP2008261340A
JP2008261340A JP2008144454A JP2008144454A JP2008261340A JP 2008261340 A JP2008261340 A JP 2008261340A JP 2008144454 A JP2008144454 A JP 2008144454A JP 2008144454 A JP2008144454 A JP 2008144454A JP 2008261340 A JP2008261340 A JP 2008261340A
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Japan
Prior art keywords
backbone
fuel injection
fuel
valve
intake passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2008144454A
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Japanese (ja)
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JP5180686B2 (en
JP2008261340A5 (en
Inventor
Kazuhito Hotsuta
万仁 堀田
Kenichiro Ikeda
健一郎 池田
Shunji Akamatsu
俊二 赤松
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2008144454A priority Critical patent/JP5180686B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J37/00—Arrangements of fuel supply lines, taps, or the like, on motor cycles or engine-assisted cycles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K2202/00—Motorised scooters

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To mount a fuel injection valve on an upper side wall of an intake passage and to inject fuel toward an intake port of a cylinder head from the valve without interference with a backbone in a motorcycle having the intake passage of an engine arranged below the backbone inclined downward with facing a rear of a body frame and along the same. <P>SOLUTION: In the backbone type motorcycle having the intake passage 12 communicating to an intake port 11 of a cylinder head 9 arranged below the backbone Ff of the body frame F and along the backbone Ff, the fuel injection valve 30 erectly provided on an upper side wall in a downstream area of the intake passage 12 in such a manner that at least an upper end of the valve 30 is positioned at a front side of a center point 32 of an outside curve at a middle bent part 14c of the backbone Ff. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は，フロントフォークを支持するヘッドパイプから後方下向きに傾斜して直線状
に延び前半直線部，この前半直線部より緩傾斜で後方下向きに直線状に延びる後半直線部
及び両直線部間を連続的に連結する中間屈曲部からなるバックボーンと，このバックボー
ンの後端に一体に結合してリアフォークを支持するリアフレームとで車体フレームを構成
し，そのリアフレームに，前記バックボーンの下方でシリンダブロック及びシリンダヘッ
ドを前方に向かって略水平に突出させるエンジンを取付け，前記シリンダヘッドと，前記
バックボーンの前端部に取付けたエアクリーナとの間を，前記バックボーンの下方に配置
されて概ね後方下向きに傾斜する吸気通路を介して接続し，この吸気通路の中間部にスロ
ットル弁を設けた，バックボーン型自動二輪車燃機関に関し，特に，前記吸気通路に燃料
噴射弁を備えるようにした，バックボーン型自動二輪車における燃料噴射装置に関する。 The present invention includes a front half straight portion extending downward and straight from a head pipe supporting a front fork, a rear half straight portion extending from the front half straight portion to a straight line downward and downward from the front half straight portion. A body frame is composed of a backbone composed of intermediate bent portions that are continuously connected and a rear frame that is integrally joined to the rear end of the backbone and supports a rear fork, and a cylinder is formed on the rear frame below the backbone. An engine is installed that projects the block and cylinder heads approximately horizontally toward the front, and between the cylinder head and the air cleaner attached to the front end of the backbone, it is located below the backbone and tilts backward and downward. Backboard with a throttle valve in the middle of the intake passage. Relates type motorcycle combustion engine, in particular, said so comprises a fuel injection valve into the intake passage, a fuel injection device in the backbone-type motorcycle.

かゝるバックボーン型自動二輪車は，本出願人会社の製造に係る，商品名「スーパーカ
ブ」の小型自動二輪車として，世界的に普及しており，それにおいては前記吸気通路の中
間部に気化器が介裝されている（例えば下記特許文献１参照）。
実公昭６２−３９９９３号公報 Such a backbone type motorcycle is widely used worldwide as a small motorcycle with the trade name “Super Cub” related to the manufacture of the applicant company. In this case, a vaporizer is installed in the middle of the intake passage. (For example, see Patent Document 1 below).
Japanese Utility Model Publication No. 62-39993

上記バックボーン型自動二輪車において，車体フレームやエンジンのレイアウトを変更
せずに，前記気化器に代えて燃料噴射弁を前記吸気通路に取付けようとすると，該燃料噴
射弁から噴射燃料をエンジンのシリンダヘッドの上面に開口する吸気ポートに確実に指向
させるためには，どうしても前記吸気通路の上側壁に取付ける必要がある。しかしながら
，前記吸気通路の上方にはフレームのバックボーンが比較的近接して配置されているので
，燃料噴射弁は，このバックボーンと干渉し易く，前記吸気通路の上側壁に簡単には取付
けことができない。 In the backbone type motorcycle described above, if the fuel injection valve is attached to the intake passage instead of the carburetor without changing the body frame or the engine layout, the injected fuel is supplied from the fuel injection valve to the cylinder head of the engine. In order to be surely directed to the intake port that opens on the upper surface of the intake passage, it must be attached to the upper side wall of the intake passage. However, since the backbone of the frame is disposed relatively close above the intake passage, the fuel injection valve easily interferes with the backbone and cannot be easily attached to the upper side wall of the intake passage. .

そこで，本発明は，従来の車体フレームやエンジンのレイアウトを変更せずとも，車体
フレームのバックボーンに干渉されずに，燃料噴射弁を前記吸気通路の上側壁に取付ける
ことができて，該弁からシリンダヘッドの吸気ポートに向かって燃料を噴射し得るように
した，前記バックボーン型自動二輪車における燃料噴射装置を提供することを目的とする
。 Therefore, the present invention can attach the fuel injection valve to the upper side wall of the intake passage without interfering with the backbone of the body frame without changing the layout of the conventional body frame and engine. It is an object of the present invention to provide a fuel injection device for the backbone type motorcycle that can inject fuel toward an intake port of a cylinder head.

上記目的を達成するために，本発明は，フロントフォークを支持するヘッドパイプから
後方下向きに傾斜して直線状に延び前半直線部，この前半直線部より緩傾斜で後方下向き
に直線状に延びる後半直線部及び両直線部間を連続的に連結する中間屈曲部からなるバッ
クボーンと，このバックボーンの後端に一体に結合してリアフォークを支持するリアフレ
ームとで車体フレームを構成し，そのリアフレームに，前記バックボーンの下方でシリン
ダブロック及びシリンダヘッドを前方に向かって略水平に突出させるエンジンを取付け，
前記シリンダヘッドと，前記バックボーンの前端部に取付けたエアクリーナとの間を，前
記バックボーンの下方に配置されて概ね後方下向きに傾斜する吸気通路を介して接続し，
この吸気通路の中間部にスロットル弁を設けた，バックボーン型自動二輪車において，前
記吸気通路の前記スロットル弁より下流域の上側壁に燃料噴射弁を，該弁の少なくとも上
端が前記バックボーンの中間屈曲部における外側曲線の中点より前方にくるようにして立
設して，該燃料噴射弁から前記シリンダヘッドの吸気ポートに向かって燃料を噴射するよ
うにしたことを第１の特徴とする。 In order to achieve the above object, the present invention provides a first half straight portion that extends downward and straight from the head pipe that supports the front fork, and a second half that extends downward and straight downward from the front half straight portion. A vehicle body frame is constituted by a backbone composed of a straight portion and an intermediate bent portion that continuously connects the two straight portions, and a rear frame that is integrally coupled to the rear end of the backbone and supports a rear fork. And an engine for projecting the cylinder block and the cylinder head substantially horizontally toward the front below the backbone,
The cylinder head and an air cleaner attached to the front end of the backbone are connected via an intake passage which is disposed below the backbone and is inclined substantially rearwardly downward.
In a backbone type motorcycle provided with a throttle valve at an intermediate portion of the intake passage, a fuel injection valve is provided on an upper side wall of the intake passage downstream from the throttle valve, and at least an upper end of the valve is an intermediate bent portion of the backbone. The first feature is that the fuel is injected from the fuel injection valve toward the intake port of the cylinder head by standing so as to be ahead of the midpoint of the outer curve in FIG.

この第１の特徴によれば，従来の車体フレームやエンジンのレイアウトを変更せずとも
，車体フレームのバックボーン及び吸気通路間の狭小なスペースを合理的に利用して，該
吸気通路の上側壁に燃料噴射弁を取付けることができ，したがって該弁からシリンダヘッ
ドの吸気ポートに向かって燃料を噴射することが可能となる。 According to this first feature, the narrow space between the backbone of the vehicle body frame and the intake passage can be rationally used without changing the layout of the conventional vehicle body frame and engine, so that A fuel injection valve can be installed, so that fuel can be injected from the valve toward the intake port of the cylinder head.

また本発明は，上記特徴に加えて，前記吸気通路の下流端部を，前記シリンダヘッドの
上面に開口する吸気ポートに連通すべく屈曲させ，その屈曲部又はその近傍に前記燃料噴
射弁を立設したことを第２の特徴とする。 According to the present invention, in addition to the above features, the downstream end portion of the intake passage is bent so as to communicate with an intake port opened on the upper surface of the cylinder head, and the fuel injection valve is set up at or near the bent portion. This is a second feature.

この第２の特徴によれば，燃料噴射弁からシリンダヘッドの吸気ポートの，特に吸気弁
が位置する下流端に向かって燃料を噴射することができ，したがって燃料の管壁への付着
によるロスを少なくすることができる。 According to this second feature, the fuel can be injected from the fuel injection valve toward the intake port of the cylinder head, particularly toward the downstream end where the intake valve is located. Can be reduced.

さらに本発明は，第１又は第２の特徴に加えて，前記燃料噴射弁の上端に，一端に噴射
圧力レギュエータを連結して前記バックボーンの下側面に沿って配置される燃料供給管を
連結したことを第３の特徴とする。 In addition to the first or second feature, the present invention further includes a fuel supply pipe arranged along the lower surface of the backbone by connecting an injection pressure regulator at one end to the upper end of the fuel injection valve. This is the third feature.

この第３の特徴によれば，車体フレームのバックボーン及び燃料噴射弁間の狭小な空間
を利用して，燃料供給管を配置することができる。 According to the third feature, the fuel supply pipe can be disposed by utilizing a narrow space between the backbone of the vehicle body frame and the fuel injection valve.

さらにまた本発明は，第１又は第２の特徴に加えて，前記燃料噴射弁の上端に，一端に
噴射圧力レギュエータを連結して，水平方向で前記バックボーンの軸線と直交するように
延びる燃料供給管を連結したことを第４の特徴とする。 Furthermore, in addition to the first or second feature, the present invention provides a fuel supply that extends in a horizontal direction so as to be orthogonal to the axis of the backbone by connecting an injection pressure regulator at one end to the upper end of the fuel injection valve. The fourth feature is that the tubes are connected.

この第４の特徴によっも，車体フレームのバックボーン及び燃料噴射弁間の狭小な空間
を利用して，燃料供給管を配置することができる。 According to the fourth feature, the fuel supply pipe can be arranged by utilizing a narrow space between the backbone of the vehicle body frame and the fuel injection valve.

以上のように本発明の第１の特徴によれば，バックボーン型自動二輪車において，吸気
通路のスロットル弁より下流域の上側壁に燃料噴射弁を，該弁の少なくとも上端がバック
ボーンの中間屈曲部における外側曲線の中点より前方にくるようにして立設して，該燃料
噴射弁から前記シリンダヘッドの吸気ポートに向かって燃料を噴射するようにしたので，
従来の車体フレームやエンジンのレイアウトを変更せずとも，バックボーン及び吸気通路
間の狭小なスペースを合理的に利用して，該吸気通路の上側壁に燃料噴射弁を取付けるこ
とができ，したがって該燃料噴射弁からシリンダヘッドの吸気ポートに向かって燃料を噴
射することが可能となる。 As described above, according to the first feature of the present invention, in the backbone type motorcycle, the fuel injection valve is provided on the upper side wall in the downstream area from the throttle valve of the intake passage, and at least the upper end of the valve is in the intermediate bent portion of the backbone. Since the fuel is injected from the fuel injection valve toward the intake port of the cylinder head, the fuel is injected from the fuel injection valve to the front of the midpoint of the outer curve.
The fuel injection valve can be attached to the upper side wall of the intake passage by rationally using the narrow space between the backbone and the intake passage without changing the layout of the conventional body frame or engine. It becomes possible to inject fuel from the injection valve toward the intake port of the cylinder head.

また本発明の第２の特徴によれば，吸気通路の下流端部を，シリンダヘッドの上面に開
口する吸気ポートに連通すべく屈曲させ，その屈曲部又はその近傍に前記燃料噴射弁を立
設したので，燃料噴射弁からシリンダヘッドの吸気ポートの，特に吸気弁が位置する下流
端に向かって燃料を噴射することができ，したがって燃料の管壁への付着によるロスを少
なくすることができる。 According to the second aspect of the present invention, the downstream end portion of the intake passage is bent so as to communicate with the intake port opened on the upper surface of the cylinder head, and the fuel injection valve is erected at or near the bent portion. Therefore, fuel can be injected from the fuel injection valve toward the downstream end of the intake port of the cylinder head, particularly where the intake valve is located. Therefore, loss due to the fuel adhering to the pipe wall can be reduced.

さらに本発明の第３の特徴によれば，燃料噴射弁の上端に，一端に噴射圧力レギュエー
タを連結してバックボーンの下側面に沿って配置される燃料供給管を連結したので，車体
フレームのバックボーン及び燃料噴射弁間の狭小な空間を利用して，燃料供給管を容易に
配置することができる。 Further, according to the third aspect of the present invention, the fuel supply pipe arranged along the lower surface of the backbone is connected to the upper end of the fuel injection valve and the injection pressure regulator is connected to one end, so that the backbone of the vehicle body frame is connected. In addition, the fuel supply pipe can be easily arranged using a narrow space between the fuel injection valves.

さらにまた本発明の第４の特徴によれば，燃料噴射弁の上端に，一端に噴射圧力レギュ
エータを連結して，水平方向で前記バックボーンの軸線と直交するように延びる燃料供給
管を連結したので，これによっても車体フレームのバックボーン及び燃料噴射弁間の狭小
な空間を利用して，燃料供給管を容易に配置することができる。 Further, according to the fourth aspect of the present invention, the fuel injection pipe is connected to the upper end of the fuel injection valve at one end and the fuel supply pipe extending in the horizontal direction so as to be orthogonal to the axis of the backbone. This also makes it possible to easily arrange the fuel supply pipe by utilizing the narrow space between the backbone of the vehicle body frame and the fuel injection valve.

本発明の実施の形態を，添付図面に示す本発明の実施例に基づいて以下に説明する。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

図１〜図４は本発明の第１実施例を示すもので，図１はバックボーン型自動二輪車の側
面図，図２は同自動二輪車のエンジン及び吸気系周りの側面図，図３は図２の吸気系にお
ける燃料噴射装置周りの拡大側面図図，図４は図３の４矢視図，図５は本発明の第２実施
例を示す，図３と同様の側面図である。 1 to 4 show a first embodiment of the present invention. FIG. 1 is a side view of a backbone type motorcycle, FIG. 2 is a side view around an engine and an intake system of the motorcycle, and FIG. FIG. 4 is an enlarged side view of the vicinity of the fuel injection device in the intake system of FIG. 4, FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3, and FIG. 5 is a side view similar to FIG.

先ず，図１〜図４により本発明の第１実施例について説明する。図１において，自動二
輪車Ｍの車体フレームＦは，前端のヘッドパイプ１の後側面に溶接されて，後方下向きに
傾斜して延びる鋼管からなるバックボーンＦｆと，このバックボーンＦｆの後端に溶接さ
れる鋼板製のリアフレームＦｒとか構成される。ヘッドパイプ１には，前輪Ｗｆを軸支す
るフロントフォーク２が操向可能に枢支され，リアフレームＦｒには，後輪Ｗｒを軸支す
るリアフォーク３が枢支され，このリアフォーク３とリアフレームＦｒ間にリアクッショ
ン４が連結される。またリアフレームＦｒの上面にサドル５が取付けられ，このサドル５
の直下のリアフレームＦｒ内に燃料タンク６が収納，保持される。さらにリアフレームＦ
ｒの前端には，バックボーンＦｆとの結合点の下方において，エンジンＥのクランクケー
ス７が取付けられる。エンジンＥは，クランクケース７の前面から突出して略水平に配置
されるシリンダブロック８を有し，その前面にシリンダヘッド９が接合される。バックボ
ーンＦｆの前端部にはエアクリーナ１０が取付けられ，これとシリンダヘッド９の吸気ポ
ート（図２参照）との間が，バックボーンＦｆの下方に配置される吸気通路１２を介して
接続される。 First, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, a vehicle body frame F of a motorcycle M is welded to the rear side surface of the head pipe 1 at the front end, and is welded to a backbone Ff made of a steel pipe extending obliquely rearward and downward, and to the rear end of the backbone Ff. A rear frame Fr made of a steel plate is configured. A front fork 2 that pivotally supports the front wheel Wf is pivotally supported on the head pipe 1 and a rear fork 3 that pivotally supports the rear wheel Wr is pivotally supported on the rear frame Fr. The rear cushion 4 is connected between the rear frames Fr. A saddle 5 is attached to the upper surface of the rear frame Fr.
The fuel tank 6 is housed and held in the rear frame Fr immediately below the rear frame Fr. Rear frame F
The crankcase 7 of the engine E is attached to the front end of r below the connecting point with the backbone Ff. The engine E has a cylinder block 8 that protrudes from the front surface of the crankcase 7 and is disposed substantially horizontally, and a cylinder head 9 is joined to the front surface of the cylinder block 8. An air cleaner 10 is attached to the front end portion of the backbone Ff, and the air cleaner 10 is connected to an intake port (see FIG. 2) of the cylinder head 9 via an intake passage 12 disposed below the backbone Ff.

上記バックボーンＦｆ，シリンダブロック８，シリンダヘッド９，エアクリーナ１０及
び吸気通路１２は，車体フレームＦに取付けられるレッグシールド１３により覆われる。 The backbone Ff, the cylinder block 8, the cylinder head 9, the air cleaner 10, and the intake passage 12 are covered with a leg shield 13 attached to the vehicle body frame F.

図２及び図３に示すように，前記バックボーンＦｆは，ヘッドパイプ１に結合して後方
下向きに傾斜して直線状に延びる前半直線部１４ａと，この前半直線部１４ａより緩傾斜
で後方下向きに直線状に延びてリアフレームＦｒに結合する後半直線部１４ｂと，これら
両直線部１４ａ，１４ｂ間を連続的に結合する，曲率半径Ｒの中間屈曲部１４ｃとからな
っている。その中間屈曲部１４ｃの下方にシリンダヘッド９が位置しており，シリンダヘ
ッド９の上面に吸気ポート１１が開口している。この吸気ポート１１の燃焼室１６への開
口端は吸気弁１５により開閉される。 As shown in FIGS. 2 and 3, the backbone Ff is coupled to the head pipe 1 and has a front half straight line portion 14a inclined downward and downwardly extending linearly, and a lower slope with a lower inclination than the front half straight line portion 14a. The second straight line portion 14b that extends linearly and is coupled to the rear frame Fr, and the intermediate bent portion 14c having a radius of curvature R that continuously couples the two straight line portions 14a and 14b. The cylinder head 9 is located below the intermediate bent portion 14c, and the intake port 11 is opened on the upper surface of the cylinder head 9. An opening end of the intake port 11 to the combustion chamber 16 is opened and closed by an intake valve 15.

前記エアクリーナ１０は，バックボーンＦｆの前半直線部１４ａの直下に配置されて前
面を開放したクリーナケース１７と，このクリーナケース１７に結合されてその開放面を
閉じるケースカバー１８と，これらクリーナケース１７及びケースカバー１８間に挟持さ
れるクリーナエレメント１９と，ケースカバー１８の上端に連結される入口ダクト２０と
から構成され，クリーナケース１７の底壁に吸気通路１２の接続孔２１が設けられている
。そして入口ダクト２０及びクリーナケース１７がバックボーンＦｆの前半直線部１４ａ
にねじ止めされる。 The air cleaner 10 includes a cleaner case 17 that is disposed immediately below the front straight line portion 14a of the backbone Ff and has a front surface opened, a case cover 18 that is coupled to the cleaner case 17 and closes the open surface, and the cleaner case 17 and The cleaner element 19 is sandwiched between the case covers 18 and an inlet duct 20 connected to the upper end of the case cover 18. A connection hole 21 for the intake passage 12 is provided in the bottom wall of the cleaner case 17. The inlet duct 20 and the cleaner case 17 are connected to the front straight line portion 14a of the backbone Ff.
Screwed on.

以上は，従来の小型自動二輪車のレイアウトと変わりがない。   The above is no different from the layout of a conventional small motorcycle.

前記吸気通路１２は，前記接続孔２１に嵌着されてクリーナケース１７内に突入したホ
ーン管２２と，前記吸気ポート１１に連通すべくシリンダヘッド９の上面に結合される吸
気管２３と，これらホーン管２２及び吸気管２３の間を接続するスロットルボディ２４と
から構成される。ホーン管２２は，中間に鈍角の屈曲部を持ち，下流側開口端を後方下向
きした略Ｌ字状をなしており，また吸気管２３も，中間に鈍角の屈曲部を持ち，上流側開
口端を前方上向きにした略Ｌ字状をなしており，両管２２，２３を接続すべく傾斜して配
置されるスロットルボディ２４は，両管２２，２３の内部を連通する直線状の吸気道２４
ａを有し，この吸気道２４ａを開閉するバタフライ型のスロットル弁２５がスロットルボ
ディ２４に軸支される。こうして，吸気通路１２は，概ねバックボーンＦｆに沿ってその
下方に配置される。 The intake passage 12 includes a horn pipe 22 that is fitted into the connection hole 21 and enters the cleaner case 17, an intake pipe 23 that is coupled to the upper surface of the cylinder head 9 to communicate with the intake port 11, and A throttle body 24 is connected between the horn pipe 22 and the intake pipe 23. The horn tube 22 has an obtuse bent portion in the middle and has a substantially L shape with the downstream opening end facing backward and downward. The intake pipe 23 also has an obtuse bent portion in the middle and has an upstream opening end. The throttle body 24, which is substantially L-shaped with the front facing upward and is inclined to connect the pipes 22 and 23, has a linear intake passage 24 that communicates with the inside of the pipes 22 and 23.
A butterfly throttle valve 25 having an opening and closing the intake passage 24 a is pivotally supported by the throttle body 24. In this way, the intake passage 12 is disposed substantially along the backbone Ff.

略Ｌ字状の吸気管２３の屈曲部もしくはその近傍の上側壁に電磁式の燃料噴射弁３０が
立設される。即ち，吸気管２３の屈曲部もしくはその近傍の上側壁には，装着孔２６を有
するボス２７が一体に形成され，その弁装着孔２６に燃料噴射弁３０の下端部がシール部
材２８を介して嵌装される。この燃料噴射弁３０の上端面には燃料入口が，下端面には燃
料噴孔がそれぞれ開口している。この燃料噴射弁３０は，その燃料噴孔からの噴射燃料３
１が前記吸気ポート１１の特に吸気弁１５により開閉される下流端に向かい，且つ上端が
前記バックボーンＦｆの中間屈曲部１４ｃにおける外側曲線の中点３２より前方にくるよ
うに，配置される。 An electromagnetic fuel injection valve 30 is erected on the bent portion of the substantially L-shaped intake pipe 23 or on the upper side wall in the vicinity thereof. That is, a boss 27 having a mounting hole 26 is integrally formed on the bent portion of the intake pipe 23 or the upper side wall in the vicinity thereof, and the lower end portion of the fuel injection valve 30 is inserted into the valve mounting hole 26 via the seal member 28. It is fitted. The fuel injection valve 30 has a fuel inlet at the upper end surface and a fuel injection hole at the lower end surface. The fuel injection valve 30 is configured to inject fuel 3 from the fuel injection hole.
1 is arranged so as to face the downstream end of the intake port 11 that is opened / closed by the intake valve 15 in particular, and the upper end is forward of the midpoint 32 of the outer curved line at the intermediate bent portion 14c of the backbone Ff.

図３及び図４に示すように，燃料噴射弁３０の上端部には，燃料供給管３４の側壁に開
口する装着孔３５がシール部材３６を介して嵌合される。この燃料供給管３４は，バック
ボーンＦｆの直下において，バックボーンＦｆの軸線Ｙと直交して水平に，即ち車体の左
右方向に配置される。この燃料供給管３４に一端には，前記燃料タンク６内に配設される
燃料ポンプ３８（図１参照）の吐出ポートに連なる燃料導管３９が接続され，またその他
端には，噴射圧力レギュエータ４０が連結される。 As shown in FIGS. 3 and 4, a mounting hole 35 that opens to the side wall of the fuel supply pipe 34 is fitted to the upper end portion of the fuel injection valve 30 via a seal member 36. The fuel supply pipe 34 is disposed directly below the backbone Ff and perpendicular to the axis Y of the backbone Ff, that is, in the left-right direction of the vehicle body. A fuel conduit 39 connected to a discharge port of a fuel pump 38 (see FIG. 1) disposed in the fuel tank 6 is connected to one end of the fuel supply pipe 34, and an injection pressure regulator 40 is connected to the other end. Are concatenated.

図４に示すように，噴射圧力レギュエータ４０は，燃料供給管３４に連通する燃料室４
１を有するレギュエータボディ４２と，ブースト負圧室４３を有してレギュエータボディ
４２に結合されるキャップ４４と，レギュエータボディ４２及びキャップ４４間に挟持さ
れて上記燃料室４１及びブースト負圧室４３間を仕切るダイヤフラム４５とを備える。レ
ギュエータボディ４２の中心部には，燃料戻し孔４６が開口する弁座４７が設けられ，こ
の弁座４７に着座し得る弁体４８がダイヤフラム４５の中心部に首振り可能に付設される
。そしてこの弁体４８をダイヤフラム４５を介して弁座４７側に付勢する弁ばね４９が
ブースト負圧室４３に収容される。ブースト負圧室４３は，負圧導管５０を介して前記吸
気管２３内に連通し，燃料戻し孔４６は，燃料戻し管５１を介して前記燃料タンク６に連
通する。さらに燃料室４１には燃料フィルタ５２が設けられる。 As shown in FIG. 4, the injection pressure regulator 40 includes a fuel chamber 4 that communicates with the fuel supply pipe 34.
1, a regulator 44 having a boost negative pressure chamber 43 and coupled to the regulator body 42, and the fuel chamber 41 and the boost negative pressure sandwiched between the regulator body 42 and the cap 44. And a diaphragm 45 for partitioning the chambers 43. A valve seat 47 in which a fuel return hole 46 is opened is provided at the center of the regulator body 42, and a valve body 48 that can be seated on the valve seat 47 is attached to the center of the diaphragm 45 so as to swing. A valve spring 49 that biases the valve body 48 toward the valve seat 47 through the diaphragm 45 is provided.
It is accommodated in the boost negative pressure chamber 43. The boost negative pressure chamber 43 communicates with the intake pipe 23 via a negative pressure conduit 50, and the fuel return hole 46 communicates with the fuel tank 6 via a fuel return pipe 51. Further, a fuel filter 52 is provided in the fuel chamber 41.

次に，この第１実施例の作用について説明する。   Next, the operation of the first embodiment will be described.

エンジンＥの作動中，噴射圧力レギュエータ４０の燃料室４１には，燃料タンク６内の
燃料が燃料ポンプ３８により燃料導管３９及び燃料供給管３４を通して圧送され，その燃
料圧力は弁体４８を弁座４７から離座する方向にダイヤフラム４５に作用する。一方，ブ
ースト負圧室４３には，吸気管２３内のブースト負圧が負圧導管５０を通して導入され，
このブースト負圧は，弁ばね４９の荷重方向とは反対に，弁体４８を弁座４７から離座す
る方向にダイヤフラム４５に作用する。したがって，エンジンＥの負荷が小さくてブース
ト負圧が高い時は，燃料室４１の燃料による弁体４８の開弁圧力は低く，エンジンＥの負
荷が大きくてブースト負圧が低い時は，燃料室４１の燃料による弁体４８の開弁圧力は高
くなり，弁体４８の開弁時，燃料室４１から燃料戻し孔４６に流出した燃料戻し管５１を
通して燃料タンク６に還流する。こうして燃料供給管３４内に燃料圧力は，エンジンＥの
負荷に応じて制御される。 During operation of the engine E, the fuel in the fuel tank 6 is pumped into the fuel chamber 41 of the injection pressure regulator 40 through the fuel conduit 39 and the fuel supply pipe 34 by the fuel pump 38, and the fuel pressure causes the valve body 48 to be seated in the valve seat 48. Acts on the diaphragm 45 in a direction away from the diaphragm 47. On the other hand, the boost negative pressure in the intake pipe 23 is introduced into the boost negative pressure chamber 43 through the negative pressure conduit 50.
The boost negative pressure acts on the diaphragm 45 in the direction in which the valve body 48 is separated from the valve seat 47, as opposed to the load direction of the valve spring 49. Therefore, when the load on the engine E is small and the boost negative pressure is high, the valve opening pressure of the valve body 48 by the fuel in the fuel chamber 41 is low, and when the load on the engine E is large and the boost negative pressure is low, the fuel chamber The valve opening pressure of the valve body 48 due to the fuel 41 becomes high, and when the valve body 48 is opened, it returns to the fuel tank 6 through the fuel return pipe 51 that has flowed out of the fuel chamber 41 into the fuel return hole 46. Thus, the fuel pressure in the fuel supply pipe 34 is controlled according to the load of the engine E.

而して，エンジンＥの吸気行程時，吸気弁１５が開くと共に，燃料噴射弁３０が励磁さ
れて開弁すると，上記のように圧力制御された燃料が該弁３０から噴射され，その噴射燃
料３１は吸気ポート１１の，吸気弁１５により開放された下流端に向かうので，エアクリ
ーナ１０で濾過されて吸気通路１２を流下する吸入空気と共に効率良く燃料室４１に吸入
される。したがって，噴射燃料３１の管壁への付着によるロスが少なく，燃費の低減に寄
与し得る。またエアクリーナ１０及び吸気ポート１１間を結ぶ吸気通路１２は，ホーン管
２２及び吸気管２３が鈍角に屈曲するだけで，全体としては後方下向きに傾斜しているの
で，吸気抵抗が小さくなり，エンジンＥの出力向上に寄与し得る。 Thus, during the intake stroke of the engine E, when the intake valve 15 is opened and the fuel injection valve 30 is excited and opened, the pressure-controlled fuel is injected from the valve 30 as described above. Since 31 is directed to the downstream end of the intake port 11 opened by the intake valve 15, the intake port 11 is efficiently sucked into the fuel chamber 41 together with the intake air filtered by the air cleaner 10 and flowing down the intake passage 12. Therefore, there is little loss due to adhesion of the injected fuel 31 to the pipe wall, which can contribute to reduction of fuel consumption. In addition, the intake passage 12 connecting the air cleaner 10 and the intake port 11 is only inclined by the horn pipe 22 and the intake pipe 23 at an obtuse angle, and as a whole is inclined backward and downward, the intake resistance is reduced, and the engine E Can contribute to the improvement of the output.

ところで，燃料噴射弁３０は，吸気管２３の屈曲部又はその近傍の上側壁に立設され，
該弁３０の少なくとも上端がバックボーンＦｆの中間屈曲部１４ｃにおける外側曲線の中
点３２より前方にくるように配置されるので，従来の車体フレームＦやエンジンＥのレイ
アウトを変更せずとも，バックボーンＦｆ及び吸気通路１２間の狭小なスペースを合理的
に利用して，該吸気通路１２の上側壁に燃料噴射弁３０を取付けることができ，したがっ
て上述のように該弁３０から吸気ポート１１の特に下流端に向かって燃料を噴射すること
が可能となる。 By the way, the fuel injection valve 30 is erected on a bent portion of the intake pipe 23 or an upper side wall in the vicinity thereof,
Since at least the upper end of the valve 30 is arranged so as to be in front of the midpoint 32 of the outer curve at the intermediate bent portion 14c of the backbone Ff, the backbone Ff can be changed without changing the layout of the conventional vehicle body frame F or engine E. The fuel injection valve 30 can be attached to the upper wall of the intake passage 12 by rationally using the narrow space between the intake passage 12 and the intake passage 12, and therefore, as described above, the fuel injection valve 30 is particularly downstream of the intake port 11. It becomes possible to inject fuel toward the end.

また燃料噴射弁３０の上端に連結する燃料供給管３４は，バックボーンＦｆの軸線と直
交して水平に配置されるので，バックボーンＦｆ及び燃料噴射弁３０間の狭小な空間に燃
料供給管３４を，バックボーンＦｆに干渉されることなく容易に配置することができる。 In addition, the fuel supply pipe 34 connected to the upper end of the fuel injection valve 30 is disposed horizontally and perpendicular to the axis of the backbone Ff, so that the fuel supply pipe 34 is disposed in a narrow space between the backbone Ff and the fuel injection valve 30. It can be easily arranged without being interfered by the backbone Ff.

次に，図５により，本発明の第２実施例について説明する。   Next, a second embodiment of the present invention will be described with reference to FIG.

この第２実施例では，燃料噴射弁３０の上端に連結する燃料供給管３４がバックボーン
Ｆｆの下側面に沿って後方下向き傾斜に配置される点，この燃料供給管３４の後端にバッ
クボーンＦｆに沿って配置される燃料導管３９が接続される点，及び燃料供給管３４の前
端に噴射圧力レギュエータ４０のレギュエータボディ４２が一体に連設される点を除けば
，前実施例と同様構成であり，図中，前実施例との対応部分には，同一の参照符号を付し
て，その説明を省略する。 In the second embodiment, the fuel supply pipe 34 connected to the upper end of the fuel injection valve 30 is disposed in a rearward downward inclination along the lower surface of the backbone Ff, and the backbone Ff is connected to the rear end of the fuel supply pipe 34. The configuration is the same as that of the previous embodiment except that the fuel conduit 39 arranged along the line and the regulator body 42 of the injection pressure regulator 40 are integrally connected to the front end of the fuel supply pipe 34. In the figure, parts corresponding to those of the previous embodiment are denoted by the same reference numerals, and description thereof is omitted.

而して，燃料供給管３４がバックボーンＦｆの下側面に沿って後方下向き傾斜に配置さ
れるので，この場合もバックボーンＦｆ及び燃料噴射弁３０間の狭小な空間に燃料供給管
３４を，バックボーンＦｆに干渉されることなく容易に配置することができる。またその
燃料供給管３４の後端に接続される燃料導管３９がバックボーンＦｆに沿って配置される
ので，燃料導管３９がバックボーンＦｆから大きく食み出すこともなく，他物との干渉を
容易に回避することができる。 Thus, since the fuel supply pipe 34 is disposed rearwardly and downwardly along the lower side surface of the backbone Ff, the fuel supply pipe 34 is placed in a narrow space between the backbone Ff and the fuel injection valve 30 in this case as well. Can be easily arranged without being interfered by. Further, since the fuel conduit 39 connected to the rear end of the fuel supply pipe 34 is disposed along the backbone Ff, the fuel conduit 39 does not protrude greatly from the backbone Ff, and it is easy to interfere with other objects. It can be avoided.

本発明は上記各実施例に限定されるものではなく，その要旨を逸脱しない範囲で種々の
設計変更が可能である。 The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention.

本発明の第１実施例を示すバックボーン型自動二輪車の側面図。1 is a side view of a backbone type motorcycle showing a first embodiment of the present invention. 同自動二輪車のエンジン及び吸気系周りの側面図。Fig. 2 is a side view around the engine and the intake system of the motorcycle. 図２の吸気系における燃料噴射装置周りの拡大側面図図。FIG. 3 is an enlarged side view around a fuel injection device in the intake system of FIG. 2. 図３の４矢視図。FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3. 本発明の第２実施例を示す，図３と同様の側面図。The side view similar to FIG. 3 which shows 2nd Example of this invention.

符号の説明Explanation of symbols

Ｅ・・・・・エンジン
Ｆ・・・・・車体フレーム
Ｆｆ・・・・バックボーン
Ｆｒ・・・・リアフレーム
Ｙ・・・・・バックボーンの軸線
１・・・・・ヘッドパイプ
２・・・・・フロントフォーク
３・・・・・リアフォーク
８・・・・・シリンダブロック
９・・・・・シリンダヘッド
１０・・・・エアクリーナ
１１・・・・吸気ポート
１２・・・・吸気通路
１４ａ・・・前半直線部
１４ｂ・・・後半直線部
１４ｃ・・・中間屈曲部
２５・・・・スロットル弁
３０・・・・燃料噴射弁
３２・・・・中間屈曲部における外側曲線の中点
３４・・・・燃料供給管
３９・・・・燃料導管
４０・・・・噴射圧力レギュエータ E ... Engine F ... Body frame Ff ... Backbone Fr ... Rear frame Y ... Backbone axis 1 ... Head pipe 2 ... Front fork 3 Rear fork 8 Cylinder block 9 Cylinder head 10 Air cleaner 11 Intake port 12 Intake passage 14a・ First half straight line portion 14b ・ ・ ・ Second half straight line portion 14c ・ ・ ・ Intermediate bent portion 25 ・ ・ ・ ・ ・ ・ Throttle valve 30 ・ ・ ・ ・ ・ ・ Fuel injection valve 32 ・ ・ ・ ・ ・ ・ Middle point 34 of the outer curved line at the intermediate bent portion ・ ・.... Fuel supply pipe 39 ... Fuel pipe 40 ... Injection pressure regulator

Claims (4)

フロントフォーク（２）を支持するヘッドパイプ（１）から後方下向きに傾斜して直線状
に延び前半直線部（１４ａ），この前半直線部（１４ａ）より緩傾斜で後方下向きに直線
状に延びる後半直線部（１４ｂ）及び両直線部（１４ａ，１４ｂ）間を連続的に連結する
中間屈曲部（１４ｃ）からなるバックボーン（Ｆｆ）と，このバックボーン（Ｆｆ）の後
端に一体に結合してリアアフォーク（３）を支持するリアフレーム（Ｆｒ）とで車体フレ
ーム（Ｆ）を構成し，そのリアフレーム（Ｆｒ）に，前記バックボーン（Ｆｆ）の下方で
シリンダブロック（８）及びシリンダヘッド（９）を前方に向かって略水平に突出させる
エンジン（Ｅ）を取付け，前記シリンダヘッド（９）と，前記バックボーン（Ｆｆ）の前
端部に取付けたエアクリーナ（１０）との間を，前記バックボーン（Ｆｆ）の下方に配置
されて概ね後方下向きに傾斜する吸気通路（１２）を介して接続し，この吸気通路（１２
）の中間部にスロットル弁（２５）を設けた，バックボーン型自動二輪車において，
前記吸気通路（１２）の前記スロットル弁（２５）より下流域の上側壁に燃料噴射弁（
３０）を，該弁（３０）の少なくとも上端が前記バックボーン（Ｆｆ）の中間屈曲部（１
４ｃ）における外側曲線の中点（３２）より前方にくるようにして立設して，該燃料噴射
弁（３０）から前記シリンダヘッド（９）の吸気ポート（１１）に向かって燃料を噴射す
るようにしたことを特徴とする，バックボーン型自動二輪車における燃料噴射装置。 A front half straight portion (14a) that extends downward and straight from the head pipe (1) that supports the front fork (2), and a rear half that extends downward and straight from the front half straight portion (14a). A backbone (Ff) comprising a straight portion (14b) and an intermediate bent portion (14c) continuously connecting the straight portions (14a, 14b) and a rear end of the backbone (Ff) are integrally coupled to the rear. A vehicle body frame (F) is constituted by a rear frame (Fr) supporting the fork (3), and a cylinder block (8) and a cylinder head (9) are formed on the rear frame (Fr) below the backbone (Ff). Is attached to the front end of the cylinder head (9) and the backbone (Ff). Between 10), connected via said backbone (intake passage which is inclined in a generally rearwardly downward is disposed below the Ff) (12), the intake passage (12
) In the backbone type motorcycle with a throttle valve (25) in the middle of
A fuel injection valve (on the upper wall of the intake passage (12) downstream from the throttle valve (25))
30), at least the upper end of the valve (30) is an intermediate bent portion (1) of the backbone (Ff).
4c) is erected so as to be ahead of the midpoint (32) of the outer curve, and fuel is injected from the fuel injection valve (30) toward the intake port (11) of the cylinder head (9). A fuel injection device for a backbone type motorcycle characterized by the above. 請求項１記載のバックボーン型自動二輪車における燃料噴射装置において，
前記吸気通路（１２）の下流端部を，前記シリンダヘッド（９）の上面に開口する吸気
ポート（１１）に連通すべく屈曲させ，その屈曲部又はその近傍に前記燃料噴射弁（３０
）を立設したことを特徴とする，バックボーン型自動二輪車における燃料噴射装置。 In the fuel injection device for a backbone type motorcycle according to claim 1,
The downstream end of the intake passage (12) is bent so as to communicate with the intake port (11) opened on the upper surface of the cylinder head (9), and the fuel injection valve (30
), A fuel injection device for a backbone type motorcycle. 請求項１又は２記載のバックボーン型自動二輪車における燃料噴射装置において，
前記燃料噴射弁（３０）の上端に，一端に噴射圧力レギュエータ（４０）を連結して前
記バックボーン（Ｆｆ）の下側面に沿って配置される燃料供給管（３４）を連結したこと
を特徴とする，バックボーン型自動二輪車における燃料噴射装置。 In the fuel injection device for a backbone type motorcycle according to claim 1 or 2,
A fuel supply pipe (34) disposed along the lower surface of the backbone (Ff) is connected to an upper end of the fuel injection valve (30) and an injection pressure regulator (40) is connected to one end. A fuel injection system for backbone motorcycles. 請求項１又は２記載のバックボーン型自動二輪車における燃料噴射装置において，
前記燃料噴射弁（３０）の上端に，一端に噴射圧力レギュエータ（４０）を連結して，
水平方向で前記バックボーン（Ｆｆ）の軸線（Ｙ）と直交するように延びる燃料供給管（
３４）を連結したことを特徴とする，バックボーン型自動二輪車における燃料噴射装置。 In the fuel injection device for a backbone type motorcycle according to claim 1 or 2,
An injection pressure regulator (40) is connected to the upper end of the fuel injection valve (30) and one end,
A fuel supply pipe extending in a horizontal direction so as to be orthogonal to the axis (Y) of the backbone (Ff)
34), a fuel injection device for a backbone type motorcycle.
JP2008144454A 2008-06-02 2008-06-02 Fuel injection device for backbone type motorcycle Expired - Fee Related JP5180686B2 (en)

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EP2289787A2 (en) 2009-08-28 2011-03-02 Honda Motor Co., Ltd. Saddle-ride type vehicle
EP2332813A3 (en) * 2009-12-10 2012-12-26 Honda Motor Co., Ltd. Scooter type vehicle

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2289787A2 (en) 2009-08-28 2011-03-02 Honda Motor Co., Ltd. Saddle-ride type vehicle
EP2332813A3 (en) * 2009-12-10 2012-12-26 Honda Motor Co., Ltd. Scooter type vehicle

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