JP3608549B2 - Intake duct device for motorcycle - Google Patents

Intake duct device for motorcycle Download PDF

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Publication number
JP3608549B2
JP3608549B2 JP2001392546A JP2001392546A JP3608549B2 JP 3608549 B2 JP3608549 B2 JP 3608549B2 JP 2001392546 A JP2001392546 A JP 2001392546A JP 2001392546 A JP2001392546 A JP 2001392546A JP 3608549 B2 JP3608549 B2 JP 3608549B2
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Prior art keywords
intake duct
cowling
intake
duct
air
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JP2002284074A (en
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安則 守谷
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Suzuki Motor Co Ltd
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Suzuki Motor Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62JCYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J40/00Arrangements of air cleaners specially adapted for cycles
    • B62J40/10Arrangements of air cleaners specially adapted for cycles characterised by air duct arrangements

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、自動二輪車の吸気ダクト装置に係り、特に、空気の取入れ効率を向上させ、組立工数や部品点数の低減を図った自動二輪車の吸気ダクト装置に関するものである。
【0002】
【従来の技術】
自動二輪車において、車体の前頭部を流線形のフロントカウリングで覆い、走行時における空気抵抗の低減と外観の向上を図った車種がある。さらに、このような車種において、エアクリーナーやエアボックス等の吸気装置からパイプ状の吸気ダクトを前方に延ばし、この吸気ダクトの先端を上記フロントカウリングの前面等に形成した走行風導入口に繋いだ吸気ダクト装置を備えたものがある。このような吸気ダクト装置によれば、自動二輪車の走行時に前方から吹きつける向かい風が吸気ダクト内に取り入れられて吸気装置に送られ、これによってエンジンへの吸入空気の充填効率が大幅に向上するのでエンジン出力を増大させることができる。
【0003】
このような吸気ダクト装置では、その吸気ダクトの先端をフロントカウリングの表面よりも前方に突出させるのが望ましい。こうすることにより、走行中に吸気ダクトに流れ込む気流に対し、フロントカウリングの表面を流れる気流が干渉しにくくなるため、吸気ダクトの先端を突出させない場合に比べ、空気を効率よく吸気ダクト内に取り入れて吸入空気の充填効率を向上させることができる。
【0004】
【発明が解決しようとする課題】
自動二輪車の吸気ダクト装置において、吸気ダクトは一般に合成樹脂成型により製造されるので、その長手方向に成型金型のパーティングラインができる。また、特にブロー成型による場合はパーティングラインの他に部分的な肉厚の偏りが発生しやすい。そして、このような吸気ダクトを、その先端がフロントカウリングの表面よりも前方に突出させるようにして設けると、吸気ダクトの前端開口部からパーティングラインや偏肉が見えてしまい、美的外観が非常に悪くなる。
【0005】
このため、一般には吸気ダクトとは別体の短いダクト延長部材を外観良く製造し、このダクト延長部材を吸気ダクトの先端に連結し、ダクト延長部材の部分のみをカウリングの走行風導入口から前方に突出させるという手法で美的外観の劣化を回避しているが、このダクト延長部材では、カウリングの走行風導入口に対してスクリュー(ビス)等の多数の専用締結部材で固定させる必要があった。
【0006】
本発明は、上述した事情を考慮してなされたもので、吸気装置内に空気を効率よく取り入れて空気の吸入効果を向上させるとともに、美的外観を向上させ、商品性を高めた自動二輪車の吸気ダクト装置を提供することを目的とする。
【0007】
【課題を解決するための手段】
本発明に係る自動二輪車の吸気ダクト装置は、上述した課題を解決するために、請求項1に記載したように、車体フレームにエンジンが懸架され、このエンジンを冷却するラジエーターを備え、前記車体フレームの前半と前記エンジンをフロントカウリングにて覆い、燃料タンクの下方に吸気装置としてのエアボックスを配設し、このエアボックスの前部に前記吸気ダクト装置を配設し、この吸気ダクト装置は、走行時に車両前方から吹きつける向かい風を前記エンジンの吸気装置に導くとともに前記フロントカウリングの表面より車両進行方向前方側に先端を突出させた自動二輪車の吸気ダクト装置において、
前記フロントカウリングを、ウィンドスクリーンと前照灯とを備えるカウリングボディと他のカウリング構成部材から構成し、前記吸気ダクト装置の先端を、前輪回転中心の上部のカウリングボディ下方に位置させるとともに前記エアボックスを前記吸気ダクト装置の先端より地上面からの高さが高い位置とし、さらに、前記吸気ダクト装置は、段差部を有する成形品のダクト延長部材を吸気ダクトの先端に連結配置する一方、その連結位置を走行風導入口よりも内側で外部から隠蔽された箇所としたものである。
【0008】
また、上述した課題を解決するため、本発明に係る自動二輪車の吸気ダクト装置は、請求項2に記載したように、前記吸気ダクト装置は、前記吸気ダクトとダクト延長部材との間に吸気ネットを配設したものである。
【0009】
【発明の実施の形態】
本発明に係る自動二輪車の吸気ダクト装置の一実施形態について添付図面を参照して説明する。
【0010】
図1は、本発明に係る吸気ダクト装置が適用された自動二輪車の左側面図であり、図2は図1に示す自動二輪車の正面図である。この自動二輪車1は、オンロードにおける高速走行用として車体の前頭部が流線形のフロントカウリング2で覆われており、走行時における空気抵抗の低減と外観の向上が図られている。
【0011】
自動二輪車1の車体フレーム3は、前頭部に位置するヘッドパイプ4から左右一対の太いメインパイプ5が後斜め下方に延びてフレームボディ6に繋がり、フレームボディ6の上部からリヤフレーム7が後方に延びた構成となっている。そして、ヘッドパイプ4にはフロントフォーク8が左右回動自在に軸支され、その下端に前輪9が支持される一方、フレームボディ6に車幅方向に架設されたピボット軸11には後方に延びるスイングアーム12が上下揺動可能に軸支され、その後端に後輪13が支持される。
【0012】
また、車体フレーム3のメインパイプ5からフレームボディ6にかけて図示しないエンジンが懸架され、このエンジンの動力がチェーン14によって後輪13に伝達されるようになっている。さらに、メインパイプ5の上部には燃料タンク15が載置され、リヤフレーム7上には運転者用のライダーシート16と同乗車用のピリオンシート17が前後に設置される。このライダーシート16およびピリオンシート17の下部周囲とリヤフレームは合成樹脂製のリヤカウリング18で覆われる。なお、符号19で示す部材は排気マフラであり、符号20で示す部材はエンジン冷却用のラジエーターである。
【0013】
ところで、燃料タンク15の車幅方向中央部には下方から上方に湾入する図示しない凹部が形成されており、この凹部の中に吸気装置22としてのエアボックス22a(またはエアクリーナー)が設けられている。このエアボックス22aの下面からは、エンジンの気筒数分の吸気パイプ23が下方に延び、エンジンに設けられたキャブレタあるいは燃料噴射装置等の混合気供給装置(非図示)に繋がる。また、エアボックス22aの前部には、本発明に係る左右一対の吸気ダクト装置24が繋がる。
【0014】
図3は、吸気ダクト装置24の第1実施形態を示す分解斜視図であり、図4は図1のIV−IV線に沿う吸気ダクト装置24の横断面図である。図1および図3に示すように、吸気ダクト装置24は合成樹脂で成型された管状の吸気ダクト25を備えている。この吸気ダクト25の後端にはゴム等の可撓性材料で柔軟に形成されたダクトジョイント26が接続され、このダクトジョイント26の後端とエアボックス22aとが、車体フレーム3のメインパイプ5に形成されたダクト穴(非図示)を挟むようにして連結される。
【0015】
一方、吸気ダクト25の先端には、図4および図6にも示すような別体のダクト延長部材27が吸気ネット28を介して連結される。例えば、吸気ネット28は吸気ダクト25の先端部外周に形成された段差部31に密に嵌合され、この吸気ネット28の先端部外周に形成された段差部32にダクト延長部材27が密に嵌合される。なお、吸気ネット28を省いて吸気ダクト25の段差部31にダクト延長部材27を直接嵌合するようにしてもよい。
【0016】
そして、ダクト延長部材27が、フロントカウリング2に形成された左右一対の走行風導入口33に挿入され、フロントカウリング2の表面よりも前方に突出するように固定されて前方に向けて開口する。このダクト延長部材27は合成樹脂成型品であるが、成型金型のパーティングラインが自動二輪車1の外観に表れないように外観良く製造する必要がある。
【0017】
例えば、ダクト延長部材27の前半部分27f(図6参照)は、走行風導入口33よりも前方に突出して外部に露呈するが、後半部分27rは走行風導入口33よりも内側に隠蔽されて外部からは見えないため、この後半部分27rにおいてパーティングラインが周方向に形成されるようにダクト延長部材27の金型構造を考慮すればよい。
【0018】
このような吸気ダクト装置24を設けたことにより、自動二輪車1の走行時に前方から吹きつける向かい風がダクト延長部材27と吸気ネット28と吸気ダクト25とダクトジョイント26を経てエアボックス22aに導かれ、その過給効果によりエンジンへの吸入空気の充填効率が大幅に向上してエンジン出力が増大する。しかも、ダクト延長部材27がフロントカウリング2の表面よりも前方に突出しているため、走行中にダクト延長部材27の中に流れ込む気流に対し、フロントカウリング2の表面を流れる気流が干渉しにくくなり、空気を効率よく吸気ダクト25内に取り入れることができる。
【0019】
また、外観良く製造されたダクト延長部材27の部分のみが走行風導入口33から前方に突出する構造であるため、ダクト延長部材27を設けずに吸気ダクト25自体の先端を走行風導入口33から突出させた場合に比べ、吸気ダクト25の長手方向に形成される成型金型のパーティングラインや部分的な肉厚の偏りが外部から見えにくくなり、美的外観が大きく向上する。
【0020】
ところで、フロントカウリング2は、フロントフォーク8の上部から車体フレーム3の前半とエンジンまでを覆うような形状に造形されており、合成樹脂成型された複数のカウリング構成部材から組み立てられている。例えば、図1に示すように、フロントカウリング2の前頭部に位置するカウリングボディ35の両側下部に左右一対のカウリングサイド36が繋がり、これら左右両側のカウリングサイド36の下端にカウリングアンダ37が連結され、図3に示すように左右両側のカウリングサイド36の内側には小形のサイドインナーパネル38が固定される構造となっている。サイドインナーパネル38は、自動二輪車1の走行時に前方から吹きつける向かい風をラジエーター20へ導く導風板として機能するものである。
【0021】
これらのカウリング構成部材35,36,37,38は、互いにスクリュー(ビス)等の締結部材により固定されて一体化される。なお、カウリングボディ35には透明なウィンドスクリーン40がスクリュー等で固定されるとともに、前照灯42、方向指示灯43、リヤビューミラ44等の部品が取り付けられる。
【0022】
前述の走行風導入口33は、カウリングサイド36とサイドインナーパネル38との間の合わせ目に設けられている。即ち、図3に示すように、カウリングサイド36の前縁には正面視で略「コ」の字形の湾入部46が形成されており、この部分に平板状のサイドインナーパネル38の前縁38aが合わせられることにより、走行風導入口33が形作られる。なお、走行風導入口33を他のカウリング構成部材、例えばカウリングボディ35とカウリングサイド36との間の合わせ目等に設けてもよい。
【0023】
サイドインナーパネル38には3つの筒状の締結部47,48,49が一体に成型されており、これらの締結部47,48,49が、カウリングサイド36に一体に成型された3つの締結ボス50,51,52に、それぞれスクリュー53で締結される。その際、吸気ダクト25の上下の輪郭部に一体成型された締結片54,55(図1にも表示)が、サイドインナーパネル38の2つの締結部47,48とカウリングサイド36の締結ボス50,51との間に挟まれて共締めされる。
【0024】
一方、走行風導入口33が形成される部分の内周面、即ちカウリングサイド36の湾入部46の内周面と、サイドインナーパネル38の前縁38a付近には、それぞれ上下一対の嵌合凸部57,58が、互いに向き合うように一体成型されている。これらの嵌合凸部57,58は、例えば短い円筒形に造形されている。
【0025】
他方、ダクト延長部材27の後半部分27rの外周面には、上記嵌合凸部57,58を嵌合可能な嵌合凹部59,60が形成されている。つまり、この嵌合凹部59,60は、嵌合凸部57,58の位置に合うようにダクト延長部材27の後半部分27rの両側縦壁面に上下に2つずつ刻設されている。なお、この嵌合凹部59,60は単なる貫通穴状に形成してもよい。
【0026】
そして、カウリングサイド36とサイドインナーパネル38の嵌合凸部57,58を、ダクト延長部材27の嵌合凹部59,60に嵌合させることにより、カウリングサイド36とサイドインナーパネル38に挟まれるようにしてダクト延長部材27が走行風導入口33に固定される。
【0027】
全体の組立手順としては、まず吸気ダクト25に吸気ネット28とダクト延長部材27を嵌合し、次にダクト延長部材27の嵌合凹部59,60をカウリングサイド36とサイドインナーパネル38の嵌合凸部57,58に嵌め込みながら吸気ダクト25とカウリングサイド36とサイドインナーパネル38を重ね合わせ、最後にスクリュー53で3部材25(締結片54,55),36,38を共締めする。
【0028】
この吸気ダクト装置24によれば、フロントカウリング2の構成部材であるカウリングサイド36とサイドインナーパネル38の組立と同時に、ダクト延長部材27をフロントカウリング2の走行風導入口33に固定することができる。ダクト延長部材27の固定には専用のスクリュー等を用いる必要が一切ないため、極めて少ない部品点数と僅かな組立工数により、ダクト延長部材27を走行風導入口33に確実に固定することができる。
【0029】
図5は、本発明に係る自動二輪車の吸気ダクト装置の第2実施形態を示している。
【0030】
この吸気ダクト装置64において、吸気ダクト65の先端に吸気ネット66を介して連結されるダクト延長部材67は、図7に示すように、その前半部分67fと後半部分67rの長さが、第1実施形態のダクト延長部材27の場合よりも長めに形成されている。また、吸気ネット66先端の段差部68の長さや、カウリングサイド69とサイドインナーパネル70の嵌合凸部71,72から走行風導入口73までの長さも第1実施形態の場合より長目に設定されている。
【0031】
このため、吸気ネット66先端の段差部68に嵌合されるダクト延長部材67は、吸気ダクト65と吸気ネット66と走行風導入口73の位置に対し、前後方向に数センチ程度スライドすることができ、このスライドによって走行風導入口73からのダクト延長部材67の突出量が変化する。
【0032】
一方、ダクト延長部材67の後半部分67rの外周面には、上下一対の嵌合凹部が、ダクト延長部材67のスライド方向に沿って複数、例えば3組形成されている。そして、これら3組の嵌合凹部74a,74b,74cのうちの任意のものを選択してカウリングサイド69とサイドインナーパネル70の嵌合凸部71,72に嵌合させることが可能になっている。
【0033】
この吸気ダクト装置64によれば、フロントカウリングの表面(走行風導入口73)からのダクト延長部材67の突出量を3段階に変化させることができる。ダクト延長部材67の突出量は、嵌合凸部71,72に嵌合凹部74aを嵌合させた時に最短になり、嵌合凹部74cを嵌合させた時に最長になる。したがって、ダクト延長部材67の突出量を自動二輪車1の走行条件に合わせて設定することができる。
【0034】
図8〜図10は、本発明に係る自動二輪車の吸気ダクト装置の第3実施形態を示している。
【0035】
この吸気ダクト装置におけるダクト延長部材79は、そのスライド量が第2実施形態の場合よりもさらに長く設定されている。また、このダクト延長部材79の後半部分79rの外周面には、ダクト延長部材79のスライド方向に沿ってより多数(例えば8組)の円形の嵌合凹部80が互いに重なり合うようにして連続的に形成されている。
【0036】
一方、カウリングサイド(非図示)とサイドインナーパネル81(図9参照)に形成される嵌合凸部82の形状は、スリット83の入った短い円筒形に造形されている。スリット83の形成方向は、ダクト延長部材79のスライド方向(嵌合凹部80の配列方向)に沿わされている。この嵌合凸部82は、多数設けられた嵌合凹部80のいずれかに嵌合される。
【0037】
このように、多数の嵌合凹部80を連続的に形成したことにより、走行風導入口からのダクト延長部材79の突出量をより細く設定変更することができる。しかも、ダクト延長部材79の突出量を変更する際には、手でダクト延長部材79を掴んで走行風導入口に対し引き出すか押し込むようにすれば、図10に示すようにスリット83の入った嵌合凸部82が撓んで各嵌合凹部80の間を移動するため、カウリングサイドとサイドインナーパネル81を分解することなく速やかにダクト延長部材79の突出量を変更することができる。
【0038】
なお、この第3実施形態の変形例として、図示はしないが、例えば嵌合凹部をダクト延長部材のスライド方向に沿う直線溝状に形成するとともに、ダクト延長部材と走行風導入口との間の嵌合しろをきつめに設定し、摩擦力でダクト延長部材が走行風導入口の内部に保持されるようにし、ダクト延長部材の突出量を無段階に設定変更できるようにしてもよい。
【0039】
また、前記第1〜第3の実施形態において、各嵌合凸部57,58,71,72,82を嵌合凹部として形成し、各嵌合凹部59,60,74a,74b,74c,80を嵌合凸部として形成してもよい。
【0040】
このように、自動二輪車の吸気ダクト装置は、前記ダクト延長部材を前記吸気ダクトおよび前記走行風導入口の位置に対して自動二輪車の前後方向にスライド可能に設けるとともに、前記嵌合凹部をダクト延長部材のスライド方向に沿って複数設けたため、走行風導入口からのダクト延長部材の突出量を変化させて自動二輪車の走行条件に合わせて設定することができる。
【0041】
【発明の効果】
以上に説明したように、本発明に係る自動二輪車の吸気ダクト装置においては、吸気ダクト装置をフロントカウリング表面より前方に突出させて吸気装置への空気の吸入効率を向上させ、フロントカウリング前方から空気を能率よく効率的に取り入れることができ、吸気ダクト装置ひいては自動二輪車の美的外観を損なわずに、商品性を向上させることができる。
【図面の簡単な説明】
【図1】本発明に係る吸気ダクト装置が適用された自動二輪車の左側面図。
【図2】図1に示す自動二輪車の正面図。
【図3】本発明の第1実施形態を示す吸気ダクト装置の分解斜視図。
【図4】図1のIV−IV線に沿う吸気ダクト装置の横断面図。
【図5】本発明の第2実施形態を示す吸気ダクト装置の横断面図。
【図6】本発明の第1実施形態におけるダクト延長部材の斜視図。
【図7】本発明の第2実施形態におけるダクト延長部材の斜視図。
【図8】本発明の第3実施形態におけるダクト延長部材の斜視図。
【図9】本発明の第3実施形態におけるサイドインナーパネルの嵌合凸部の拡大図。
【図10】本発明の第3実施形態における嵌合凸部と嵌合凹部の嵌合状態を示す側面図。
【符号の説明】
1 自動二輪車
2 フロントカウリング
3 車体フレーム
4 ヘッドパイプ
5 メインパイプ(メインフレーム)
6 フレームボディ
8 フロントフォーク
9 前輪
12 スイングアーム
13 後輪
15 燃料タンク
20 ラジエーター
22 吸気装置
22a エアボックス
24 吸気ダクト装置
25 吸気ダクト
26 ダクトジョイント
27 ダクト延長部材
28 吸気ネット
33 走行風導入口
35 カウリングボディ(カウリング構成部材)
36 カウリングサイド(カウリング構成部材)
38 サイドインナーパネル(カウリング構成部材)
40 ウィンドスクリーン
42 前照灯
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake duct device for a motorcycle, and more particularly to an intake duct device for a motorcycle that improves air intake efficiency and reduces the number of assembly steps and the number of parts.
[0002]
[Prior art]
In some motorcycles, the front of the vehicle body is covered with a streamlined front cowling to reduce the air resistance and improve the appearance during driving. Furthermore, in such a vehicle model, a pipe-like intake duct is extended forward from an intake device such as an air cleaner or an air box, and the tip of the intake duct is connected to a traveling wind inlet formed on the front surface of the front cowling. Some have an intake duct device. According to such an intake duct device, the head wind blown from the front during traveling of the motorcycle is taken into the intake duct and sent to the intake device, which greatly improves the efficiency of charging the intake air into the engine. The engine output can be increased.
[0003]
In such an air intake duct device, it is desirable that the front end of the air intake duct projects forward from the surface of the front cowling. In this way, the airflow that flows into the intake duct during travel is less likely to interfere with the airflow that flows on the surface of the front cowling, so air can be taken into the intake duct more efficiently than when the front end of the intake duct is not projected. Thus, the charging efficiency of the intake air can be improved.
[0004]
[Problems to be solved by the invention]
In an intake duct device for a motorcycle, since the intake duct is generally manufactured by synthetic resin molding, a molding die parting line can be formed in the longitudinal direction thereof. In particular, in the case of blow molding, in addition to the parting line, partial thickness deviation tends to occur. If such an intake duct is provided so that its tip protrudes forward from the surface of the front cowling, the parting line and uneven thickness can be seen from the front end opening of the intake duct, and the aesthetic appearance is very good. Get worse.
[0005]
For this reason, in general, a short duct extension member separate from the intake duct is manufactured with good appearance, and this duct extension member is connected to the tip of the intake duct, and only the duct extension member portion is forward of the cowling traveling wind inlet. The duct extension member has to be fixed to the running wind inlet of the cowling with a number of exclusive fastening members such as screws (screws). .
[0006]
The present invention has been made in consideration of the above-described circumstances. The intake air of a motorcycle has been improved by taking air efficiently into the intake device to improve the air intake effect, improve the aesthetic appearance, and improve the merchantability. An object is to provide a duct device.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, an intake duct device for a motorcycle according to the present invention includes a radiator that cools the engine, the engine being suspended from a vehicle body frame, and the vehicle body frame. covering the first half of the engine at the front cowling, the air box or the suction air device below the fuel tank is disposed, and disposing the air intake duct device in front of the air box, the air intake duct system, In the intake duct device of a motorcycle , the head wind blowing from the front of the vehicle when traveling is guided to the intake device of the engine and the front end protrudes forward from the front cowling surface in the vehicle traveling direction.
The front cowling is composed of a cowling body having a windscreen and a headlight and other cowling components, and the tip of the intake duct device is positioned below the cowling body at the top of the front wheel rotation center and the air box And a position where the height from the ground surface is higher than the front end of the air intake duct device, and the air intake duct device connects and disposes a duct extension member of a molded product having a stepped portion to the front end of the air intake duct. The position is a portion concealed from the outside inside the traveling wind inlet .
[0008]
In order to solve the above-described problem, the intake duct device for a motorcycle according to the present invention is characterized in that, as described in claim 2, the intake duct device includes an intake net between the intake duct and a duct extension member. Is provided .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of an intake duct device for a motorcycle according to the present invention will be described with reference to the accompanying drawings.
[0010]
FIG. 1 is a left side view of a motorcycle to which an intake duct device according to the present invention is applied, and FIG. 2 is a front view of the motorcycle shown in FIG. In the motorcycle 1, the frontal portion of the vehicle body is covered with a streamlined front cowling 2 for on-road high-speed traveling, and air resistance is reduced and appearance is improved during traveling.
[0011]
A body frame 3 of the motorcycle 1 includes a pair of left and right main pipes 5 extending obliquely downward and connected to a frame body 6 from a head pipe 4 located at the frontal head, and a rear frame 7 from the top of the frame body 6 to the rear. It is the structure extended to. A front fork 8 is pivotally supported on the head pipe 4 so as to be pivotable in the left-right direction, and a front wheel 9 is supported at the lower end thereof, while a pivot shaft 11 erected on the frame body 6 in the vehicle width direction extends rearward. The swing arm 12 is pivotally supported so as to swing up and down, and a rear wheel 13 is supported at the rear end thereof.
[0012]
An engine (not shown) is suspended from the main pipe 5 of the vehicle body frame 3 to the frame body 6, and the power of the engine is transmitted to the rear wheel 13 by the chain 14. Further, a fuel tank 15 is mounted on the upper part of the main pipe 5, and a rider seat 16 for the driver and a pillion seat 17 for the passenger are installed on the rear frame 7 in the front-rear direction. The lower peripheries and rear frames of the rider seat 16 and the pillion seat 17 are covered with a synthetic resin rear cowling 18. In addition, the member shown with the code | symbol 19 is an exhaust muffler, and the member shown with the code | symbol 20 is a radiator for engine cooling.
[0013]
By the way, a recess (not shown) is formed in the center of the fuel tank 15 in the vehicle width direction so as to enter the upper side from below, and an air box 22a (or an air cleaner) as an intake device 22 is provided in the recess. ing. From the lower surface of the air box 22a, intake pipes 23 for the number of cylinders of the engine extend downward, and are connected to an air-fuel mixture supply device (not shown) such as a carburetor or a fuel injection device provided in the engine. A pair of left and right intake duct devices 24 according to the present invention are connected to the front portion of the air box 22a.
[0014]
FIG. 3 is an exploded perspective view showing the first embodiment of the intake duct device 24, and FIG. 4 is a cross-sectional view of the intake duct device 24 taken along line IV-IV in FIG. As shown in FIGS. 1 and 3, the intake duct device 24 includes a tubular intake duct 25 formed of synthetic resin. A duct joint 26 made of a flexible material such as rubber is connected to the rear end of the intake duct 25, and the rear end of the duct joint 26 and the air box 22 a are connected to the main pipe 5 of the vehicle body frame 3. Are connected so as to sandwich a duct hole (not shown) formed in the above.
[0015]
On the other hand, a separate duct extension member 27 as shown in FIGS. 4 and 6 is connected to the tip of the intake duct 25 via an intake net 28. For example, the intake net 28 is closely fitted to a step portion 31 formed on the outer periphery of the front end portion of the intake duct 25, and the duct extension member 27 is tightly connected to the step portion 32 formed on the outer periphery of the front end portion of the intake net 28. Mated. Note that the duct extension member 27 may be directly fitted to the step portion 31 of the intake duct 25 without the intake net 28.
[0016]
The duct extension member 27 is inserted into a pair of left and right traveling wind inlets 33 formed in the front cowling 2, is fixed so as to protrude forward from the surface of the front cowling 2, and opens forward. Although this duct extending member 27 is a synthetic resin molded product, it needs to be manufactured with good appearance so that the parting line of the molding die does not appear on the appearance of the motorcycle 1.
[0017]
For example, the front half portion 27f (see FIG. 6) of the duct extension member 27 protrudes forward from the traveling wind introduction port 33 and is exposed to the outside, but the rear half portion 27r is concealed inside the traveling wind introduction port 33. Since it cannot be seen from the outside, the mold structure of the duct extending member 27 may be considered so that the parting line is formed in the circumferential direction in the latter half portion 27r.
[0018]
By providing such an intake duct device 24, the head wind blown from the front during traveling of the motorcycle 1 is guided to the air box 22a through the duct extension member 27, the intake net 28, the intake duct 25, and the duct joint 26, Due to the supercharging effect, the efficiency of charging the intake air into the engine is greatly improved, and the engine output is increased. Moreover, since the duct extension member 27 projects forward from the surface of the front cowling 2, the airflow flowing on the surface of the front cowling 2 is less likely to interfere with the airflow flowing into the duct extension member 27 during travel. Air can be efficiently taken into the intake duct 25.
[0019]
Further, since only the portion of the duct extension member 27 manufactured with good appearance protrudes forward from the traveling wind introduction port 33, the front end of the intake duct 25 itself is not provided with the duct extension member 27 and the traveling wind introduction port 33 is provided. Compared with the case where it projects from the outside, the parting line of the molding die formed in the longitudinal direction of the intake duct 25 and the partial thickness deviation are less visible from the outside, and the aesthetic appearance is greatly improved.
[0020]
By the way, the front cowling 2 is shaped so as to cover from the upper part of the front fork 8 to the front half of the vehicle body frame 3 and the engine, and is assembled from a plurality of cowling components formed by synthetic resin. For example, as shown in FIG. 1, a pair of left and right cowling sides 36 are connected to lower portions on both sides of a cowling body 35 located at the front of the front cowling 2, and cowling under 37 is connected to lower ends of the left and right cowling sides 36. As shown in FIG. 3, a small side inner panel 38 is fixed inside the cowling side 36 on both the left and right sides. The side inner panel 38 functions as an air guide plate that guides the head wind blown from the front during traveling of the motorcycle 1 to the radiator 20.
[0021]
These cowling constituent members 35, 36, 37, and 38 are fixed and integrated with each other by fastening members such as screws (screws). A transparent wind screen 40 is fixed to the cowling body 35 with a screw or the like, and components such as a headlamp 42, a direction indicator lamp 43, and a rear view mirror 44 are attached.
[0022]
The traveling wind inlet 33 described above is provided at the joint between the cowling side 36 and the side inner panel 38. That is, as shown in FIG. 3, the front edge of the cowling side 36 is formed with a substantially “U” -shaped bay insertion portion 46 in front view, and the front edge 38 a of the flat side inner panel 38 is formed in this portion. As a result, the traveling wind inlet 33 is formed. The traveling wind inlet 33 may be provided at another cowling component, for example, at the joint between the cowling body 35 and the cowling side 36.
[0023]
Three cylindrical fastening portions 47, 48, 49 are integrally formed on the side inner panel 38, and these fastening portions 47, 48, 49 are integrally formed with the cowling side 36. Fastened to 50, 51 and 52 by a screw 53, respectively. At that time, fastening pieces 54 and 55 (also shown in FIG. 1) integrally formed on the upper and lower contour portions of the intake duct 25 are connected to the two fastening portions 47 and 48 of the side inner panel 38 and the fastening boss 50 of the cowling side 36. , 51 and are fastened together.
[0024]
On the other hand, a pair of upper and lower fitting protrusions are provided on the inner peripheral surface of the portion where the traveling wind introduction port 33 is formed, that is, on the inner peripheral surface of the baying portion 46 of the cowling side 36 and the front edge 38a of the side inner panel 38. The parts 57 and 58 are integrally molded so as to face each other. These fitting convex parts 57 and 58 are modeled in a short cylindrical shape, for example.
[0025]
On the other hand, on the outer peripheral surface of the rear half portion 27r of the duct extension member 27, fitting concave portions 59, 60 capable of fitting the fitting convex portions 57, 58 are formed. That is, the fitting recesses 59 and 60 are cut in two on the vertical wall surfaces on both sides of the rear half portion 27r of the duct extension member 27 so as to match the positions of the fitting projections 57 and 58. In addition, you may form these fitting recessed parts 59 and 60 in a simple through-hole shape.
[0026]
Then, the fitting convex portions 57 and 58 of the cowling side 36 and the side inner panel 38 are fitted into the fitting concave portions 59 and 60 of the duct extending member 27 so as to be sandwiched between the cowling side 36 and the side inner panel 38. Thus, the duct extension member 27 is fixed to the traveling wind inlet 33.
[0027]
As a whole assembly procedure, first, the intake net 28 and the duct extension member 27 are fitted to the intake duct 25, and then the fitting recesses 59 and 60 of the duct extension member 27 are fitted to the cowling side 36 and the side inner panel 38. The intake duct 25, the cowling side 36, and the side inner panel 38 are overlapped while being fitted into the convex portions 57, 58, and finally the three members 25 (fastening pieces 54, 55), 36, 38 are fastened together with the screw 53.
[0028]
According to the intake duct device 24, the duct extension member 27 can be fixed to the traveling wind inlet 33 of the front cowling 2 simultaneously with the assembly of the cowling side 36 and the side inner panel 38, which are constituent members of the front cowling 2. . Since there is no need to use a dedicated screw or the like for fixing the duct extension member 27, the duct extension member 27 can be reliably fixed to the traveling wind inlet 33 with a very small number of parts and a small number of assembly steps.
[0029]
FIG. 5 shows a second embodiment of the intake duct device for a motorcycle according to the present invention.
[0030]
In the intake duct device 64, the duct extension member 67 connected to the tip of the intake duct 65 via the intake net 66 has a length of the first half portion 67f and the second half portion 67r as shown in FIG. It is formed longer than the duct extension member 27 of the embodiment. Further, the length of the stepped portion 68 at the tip of the intake net 66 and the length from the fitting convex portions 71 and 72 of the cowling side 69 and the side inner panel 70 to the traveling wind inlet 73 are longer than in the case of the first embodiment. Is set.
[0031]
For this reason, the duct extension member 67 fitted to the stepped portion 68 at the tip of the intake net 66 can slide about several centimeters in the front-rear direction with respect to the positions of the intake duct 65, the intake net 66, and the traveling wind introduction port 73. The sliding amount of the duct extending member 67 from the traveling wind introduction port 73 is changed by this slide.
[0032]
On the other hand, a plurality of, for example, three sets of a pair of upper and lower fitting recesses are formed on the outer peripheral surface of the rear half portion 67r of the duct extension member 67 along the sliding direction of the duct extension member 67. An arbitrary one of these three sets of fitting recesses 74a, 74b, and 74c can be selected and fitted to the fitting protrusions 71 and 72 of the cowling side 69 and the side inner panel 70. Yes.
[0033]
According to the intake duct device 64, the amount of protrusion of the duct extension member 67 from the surface of the front cowling (the traveling wind inlet 73) can be changed in three stages. The amount of protrusion of the duct extension member 67 is the shortest when the fitting concave portions 74a are fitted to the fitting convex portions 71 and 72, and the longest when the fitting concave portion 74c is fitted. Therefore, the protruding amount of the duct extending member 67 can be set according to the traveling condition of the motorcycle 1.
[0034]
8 to 10 show a third embodiment of the intake duct device for a motorcycle according to the present invention.
[0035]
The duct extension member 79 in this intake duct device is set to have a longer slide amount than in the second embodiment. Further, a larger number (for example, eight sets) of circular fitting recesses 80 are continuously formed on the outer peripheral surface of the rear half portion 79r of the duct extension member 79 so as to overlap each other along the sliding direction of the duct extension member 79. Is formed.
[0036]
On the other hand, the shape of the fitting convex portion 82 formed on the cowling side (not shown) and the side inner panel 81 (see FIG. 9) is formed into a short cylindrical shape with a slit 83. The slit 83 is formed in the direction in which the duct extending member 79 slides (the direction in which the fitting recesses 80 are arranged). The fitting projections 82 are fitted into any of the many fitting recesses 80 provided.
[0037]
In this way, by forming a large number of fitting recesses 80 continuously, the amount of protrusion of the duct extension member 79 from the traveling wind introduction port can be set and changed more narrowly. Moreover, when changing the protruding amount of the duct extending member 79, if the duct extending member 79 is grasped by hand and pulled out or pushed into the running wind inlet, a slit 83 is entered as shown in FIG. Since the fitting convex part 82 bends and moves between the fitting concave parts 80, the protruding amount of the duct extending member 79 can be quickly changed without disassembling the cowling side and the side inner panel 81.
[0038]
As a modification of the third embodiment, although not illustrated, for example, the fitting recess is formed in a linear groove shape along the sliding direction of the duct extension member, and between the duct extension member and the traveling wind introduction port. The fitting margin may be set tightly so that the duct extension member is held inside the traveling wind inlet by the frictional force so that the amount of protrusion of the duct extension member can be set and changed steplessly.
[0039]
In the first to third embodiments, the fitting convex portions 57, 58, 71, 72, 82 are formed as fitting concave portions, and the fitting concave portions 59, 60, 74a, 74b, 74c, 80 are formed. You may form as a fitting convex part.
[0040]
As described above, in the intake duct device for a motorcycle, the duct extension member is provided so as to be slidable in the front-rear direction of the motorcycle with respect to the position of the intake duct and the traveling wind inlet, and the fitting recess is formed as a duct extension Since a plurality of members are provided along the sliding direction of the member, the amount of protrusion of the duct extension member from the traveling wind inlet can be changed and set according to the traveling condition of the motorcycle.
[0041]
【The invention's effect】
As described above, in the motorcycle air intake duct device according to the present invention, the air intake duct device projects forward from the front cowling surface to improve the efficiency of air intake into the air intake device, and the air from the front of the front cowling. Can be introduced efficiently and efficiently, and the merchantability can be improved without impairing the aesthetic appearance of the intake duct device and the motorcycle.
[Brief description of the drawings]
FIG. 1 is a left side view of a motorcycle to which an intake duct device according to the present invention is applied.
2 is a front view of the motorcycle shown in FIG. 1. FIG.
FIG. 3 is an exploded perspective view of the intake duct device showing the first embodiment of the present invention.
4 is a cross-sectional view of the intake duct device taken along line IV-IV in FIG.
FIG. 5 is a cross-sectional view of an intake duct device showing a second embodiment of the present invention.
FIG. 6 is a perspective view of a duct extension member according to the first embodiment of the present invention.
FIG. 7 is a perspective view of a duct extension member according to a second embodiment of the present invention.
FIG. 8 is a perspective view of a duct extension member according to a third embodiment of the present invention.
FIG. 9 is an enlarged view of a fitting convex portion of a side inner panel in a third embodiment of the present invention.
FIG. 10 is a side view showing a fitting state of a fitting convex part and a fitting concave part in a third embodiment of the present invention.
[Explanation of symbols]
1 Motorcycle 2 Front cowling 3 Body frame 4 Head pipe 5 Main pipe (main frame)
6 Frame body 8 Front fork 9 Front wheel 12 Swing arm 13 Rear wheel 15 Fuel tank 20 Radiator 22 Intake device 22a Air box 24 Intake duct device 25 Intake duct 26 Duct joint 27 Duct extension member 28 Intake net 33 Running wind inlet 35 Cowling body (Cowling component)
36 Cowling side (Cowling component)
38 Side inner panel (Cowling component)
40 Wind screen 42 Headlight

Claims (2)

車体フレームにエンジンが懸架され、このエンジンを冷却するラジエーターを備え、前記車体フレームの前半と前記エンジンをフロントカウリングにて覆い、燃料タンクの下方に吸気装置としてのエアボックスを配設し、このエアボックスの前部に前記吸気ダクト装置を配設し、この吸気ダクト装置は、走行時に車両前方から吹きつける向かい風を前記エンジンの吸気装置に導くとともに前記フロントカウリングの表面より車両進行方向前方側に先端を突出させた自動二輪車の吸気ダクト装置において、
前記フロントカウリングを、ウィンドスクリーンと前照灯とを備えるカウリングボディと他のカウリング構成部材から構成し、前記吸気ダクト装置の先端を、前輪回転中心の上部のカウリングボディ下方に位置させるとともに前記エアボックスを前記吸気ダクト装置の先端より地上面からの高さが高い位置とし、さらに、前記吸気ダクト装置は、段差部を有する成形品のダクト延長部材を吸気ダクトの先端に連結配置する一方、その連結位置を走行風導入口よりも内側で外部から隠蔽された箇所としたことを特徴とする自動二輪車の吸気ダクト装置。
Engine is suspended on the vehicle body frame, comprising a radiator for cooling the engine, the first half and the engine of the vehicle body frame covered with the front cowling, arranged the air box or the suction air device below the fuel tank, the air and disposing the intake duct device to the front of the box, the air intake duct system, the tip of the head wind blowing from the front of the vehicle during traveling in the vehicle traveling direction front side than the surface of the front cowling and guides the intake system of the engine In the intake duct device for motorcycles with protruding
The front cowling is composed of a cowling body having a windscreen and a headlight and other cowling components, and the tip of the intake duct device is positioned below the cowling body at the top of the front wheel rotation center and the air box And a position where the height from the ground surface is higher than the front end of the air intake duct device, and the air intake duct device connects and disposes a duct extension member of a molded product having a stepped portion to the front end of the air intake duct. An intake duct device for a motorcycle, characterized in that the position is concealed from the outside inside the running wind inlet .
前記吸気ダクト装置は、前記吸気ダクトとダクト延長部材との間に吸気ネットを配設したことを特徴とする請求項1記載の自動二輪車の吸気ダクト装置。2. The intake duct device for a motorcycle according to claim 1, wherein an intake net is disposed between the intake duct and a duct extension member .
JP2001392546A 2001-12-25 2001-12-25 Intake duct device for motorcycle Expired - Lifetime JP3608549B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001392546A JP3608549B2 (en) 2001-12-25 2001-12-25 Intake duct device for motorcycle

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JP3969584B2 (en) * 2003-03-19 2007-09-05 本田技研工業株式会社 Front body cover structure
US7395790B2 (en) 2004-11-18 2008-07-08 S&S Cycle, Inc. Reed valve breather for evolution engine
JP4444868B2 (en) * 2005-03-31 2010-03-31 本田技研工業株式会社 Air intake duct structure
JP5921125B2 (en) 2011-10-04 2016-05-24 川崎重工業株式会社 Motorcycle wind guide structure

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