JP3751077B2

JP3751077B2 - Intake air intake structure for scooter type vehicles

Info

Publication number: JP3751077B2
Application number: JP17637096A
Authority: JP
Inventors: 敏浩大高; 征央細谷; 顕暢益永; 貞通遠城; 栄遠藤
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1996-05-17
Filing date: 1996-07-05
Publication date: 2006-03-01
Anticipated expiration: 2016-07-05
Also published as: CN1086350C; ITTO970365A1; IT1292291B1; FR2748702B1; TW479035B; CN1169930A; FR2748702A1; ES2138531B1; ITTO970365A0; ES2138531A1; JPH1029581A

Description

【０００１】
【発明の属する技術分野】
本発明は、車体後部に上下揺動自在に枢支したパワーユニットの伝動ケース上方にエアクリーナを支持し、このエアクリーナに吸気ダクトを介して空気を取り入れるスクータ型車両における吸入空気取入構造に関する。
【０００２】
【従来の技術】
かかる吸入空気取入構造は、例えば実開昭６４−２２６９２号公報により公知である。このものは、上端に空気取入口を有する吸気通路をシートの下部に設けた収納ボックスの前部に上下方向に形成し、エアクリーナから前方に延びる吸気ダクトの前端を前記吸気通路の下端に接続した構造を備える。
【０００３】
【発明が解決しようとする課題】
ところで、上記従来ものは、空気取入口が路面から高い位置に設けられているので塵埃の吸入防止に関しては有利であるが、吸気通路及び吸気ダクトよりなる流路の全長が長くなり、しかも吸気通路及び吸気ダクトが直角に接続されているので、吸気の吸入抵抗が増加してエンジンの出力が減少する問題がある。
【０００４】
本発明は前述の事情に鑑みてなされたもので、塵埃の吸入を防止しながら吸気の吸入抵抗を減少させてエンジンの出力を増加させることを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、請求項１に記載された発明は、車体後部に上下揺動自在に枢支したパワーユニットの伝動ケース上方にエアクリーナを支持し、このエアクリーナに吸気ダクトを介して空気を取り入れるスクータ型車両において、ステップフロアの後方でシートの下方の車体側部を覆うボディカバーに開口を形成し、この開口に臨むように前記ボディカバーの内面に設けた吸気チャンバーが、前記吸気ダクトを接続させる出口開口部を備えた上室と、その出口開口部よりも低い位置にある入口開口部を備えた下室とに区画されると共に、これら下室及び上室を相互に連通させる連通孔が、該入口開口部の下端よりも低い位置に配置されていて、その吸気チャンバー内で該入口開口部と該出口開口部との間の空気流路がラビリンス状に形成されていることを特徴とする。
【０００６】
また請求項２に記載された発明は、請求項１の構成に加えて、前記出口開口部が、前記吸気チャンバーの上部に設けられ、前記入口開口部が、前記ボディカバーの開口に臨ませて前記吸気チャンバーの側部に設けられることを特徴とする。
【０００７】
また請求項３に記載された発明は、請求項２の構成に加えて、前記下室の下部に排圧用開口部を設けたことを特徴とする。
【０００８】
また請求項４に記載された発明は、車体後部に上下揺動自在に枢支したパワーユニットの伝動ケース上方にエアクリーナを支持し、このエアクリーナに吸気ダクトを介して空気を取り入れるスクータ型車両において、ステップフロアの後方でシートの下方の車体側部を覆うボディカバーに開口を形成し、この開口に臨むように前記ボディカバーの内面に設けた吸気チャンバーには、その吸気チャンバー本体の上部に出口開口部が設けられると共に、同吸気チャンバー本体の側部に、該出口開口部よりも低い位置にある入口開口部が前記ボディカバーの開口に臨ませて設けられ、前記吸気チャンバーは、上端が前記出口開口部を貫通して前記吸気ダクトに接続され下端が前記吸気チャンバー本体内に開口するパイプ部材を備えていると共に、このパイプ部材の下端開口部が前記入口開口部の下端よりも低い位置に配置されていて、前記吸気チャンバー本体内で該入口開口部と該パイプ部材との間の空気流路がラビリンス状に形成されていることを特徴とする。
【０００９】
また請求項５に記載された発明は、請求項４の構成に加えて、前記吸気チャンバー本体の上部に排圧用開口部を設けると共に、下部に排水用開口部を設けたことを特徴とする。また請求項６に記載された発明は、請求項１の構成に加えて、前記ボディカバーの開口を通してピリオンライダー用の補助ステップをボディカバーの外側に延出させたことを特徴とする。
【００１０】
【発明の実施の形態】
以下、本発明の実施形態を、添付図面に示した本発明の実施例に基づいて説明する。
【００１１】
図１〜図６は本発明の第１実施例を示すもので、図１はスクータ型自動二輪車の全体側面図、図２は図１の要部拡大図、図３は図２においてサイドカバーを取り外した状態を示す図、図４は図３の４方向矢視図、図５は図２の５−５線拡大断面図、図６は図２の６−６線拡大断面図である。
【００１２】
図１に示すように、スクータ型自動二輪車Ｖの骨格を構成する鋼管溶接製フレームＦは、ヘッドパイプ１と、ヘッドパイプ１にガセット２，２を介して結合されて車体後下方に延びるダウンチューブ３と、ダウンチューブ３の下端近傍から左右に分岐して車体後上方に延び、後端においてＵ字状に湾曲して一体に連なる左右のメインフレーム４，４とから構成される。左右のメインフレーム４の前部とダウンチューブ３の下端とは一対の補強パイプ５，５により連結され、また左右のメインフレーム４，４の前後方向中間部及び後部はそれぞれ車体左右方向に延びる第１クロスメンバ６及び第２クロスメンバ７により連結される。
【００１３】
フレームＦに支持された合成樹脂製のボディＢは、ヘッドパイプ１の前面を覆うレッグシールドフロント部材８と、レッグシールドフロント部材８の後面に結合されてヘッドパイプ１の後面を覆うレッグシールドリヤ部材９と、レッグシールドリヤ部材９の下端に連なるステップフロア１０と、レッグシールドフロント部材８の下端に連なってステップフロア１０の下面を覆うアンダーカバー１１と、車体後部を覆うリヤカバー１２と、リヤカバー１２の左右前部からステップフロア１０及びアンダーカバー１１の後端に連なる左右のサイドカバー１３，１３とから構成される。
【００１４】
ヘッドパイプ１に回転自在に支持されたフロントフォーク１４の下端に、上部をフロントフェンダー１５により覆われた前輪Ｗｆが軸支される。レッグシールドフロント部材８及びレッグシールドリヤ部材９の上端開口部を覆うアッパーパネル１６から上方に延出するハンドルポスト１７の上面に、バーハンドル１８の左右方向中央部が結合される。ハンドルポスト１７にはヘッドライト１９及びスピードメータ２０が支持され、またヘッドパイプ１の右側面にはイグニッションスイッチを一体に有するハンドルロック装置２１が支持される。
【００１５】
後端に後輪Ｗｒを軸支したパワーユニットＰの前端が第１クロスメンバ６に上下揺動自在に支持されており、このパワーユニットＰと第２クロスメンバ７とがリヤクッション２２により接続される。リヤカバー１２の上面にライダーが座乗するシート２３が設けられる。
【００１６】
図２に示すように、左右のサイドカバー１３，１３には車体内側に向けて凹む凹部１３₁，１３₁が形成されており、これら凹部１３₁，１３₁の中央に形成された開口１３₂，１３₂からピリオンライダー用の補助ステップ３１，３１が車体外側に突出する。補助ステップ３１，３１は以下のようにして車体に支持される。即ち、左右のメインフレーム４，４にそれぞれ溶接したパワーユニット支持ブラケット３２，３２に左右のステップステー３３，３３をボルト３４…で固定し、これらステップステー３３，３３に車体左右方向に配置したステップバー３５の左右両端を溶接して補強する。そして左右のステップステー３３，３３とステップバー３５の左右両端とに、前記補助ステップ３１，３１を固定する。
【００１７】
次に図３〜図６を参照しながらパワーユニットＰの吸気系の構造について説明する。
【００１８】
パワーユニットＰの伝動ケース３０の上面にボルト３６でエアクリーナ３７が支持される。エアクリーナ３７の入口部３７₁には車体前方に延びる吸気ダクト３８の後端が接続され、この吸気ダクト３８の前端は蛇腹状に形成されたラバー製のブーツ３９を介して、車体左側のサイドカバー１３の内面に固定した吸気チャンバー４０に接続される。またエアクリーナ３７の出口部３７₂は、キャブレタ４１及び吸気管４２を介してエンジンＥのクランクケースに接続される。
【００１９】
合成樹脂製の吸気チャンバー４０は上半体５１と下半体５２とに２分割されており、上半体５１の外周を下半体５２の内周に嵌合させた状態で、上半体５１に形成した複数個の突起５１₃…を下半体５２に形成した複数個の係止孔５２₃に係合させることにより一体に結合される。上半体５１の前部及び後部にはそれぞれ取付ブラケット５１₄，５１₄が突設されており、これら取付ブラケット５１₄，５１₄を貫通するビス４３，４３をサイドカバー１３の内面に突設したボス部１３₃，１３₃にそれぞれ螺入することにより、吸気チャンバー４０がサイドカバー１３の内面に固定される。図５には後部の取付ブラケット５１₄による固定部が示されているが、前部の取付ブラケット５１₄による固定部も同様の構造である。
【００２０】
上半体５１は上部に後向きに開口する出口開口部５１₁を備えるとともに下部に下向きに開口する連通孔５１₂を備え、また下半体５２は側部に左向きに開口する入口開口部５２₁を備えるとともに下部に下向きに開口する排圧用開口部５２₂を備える。図６から明らかなように連通孔５１₂の高さは、入口開口部５２₁の下端の高さよりも距離αだけ低い位置に配置されている。また排圧用開口部５２₂の面積は、入口開口部５２₁の面積及び連通孔５１₂の面積よりも小さく形成されている。
【００２１】
吸気チャンバー４０をサイドカバー１３に取り付けたとき、その入口開口部５２₁はサイドカバー１３の開口１３₂の後部に臨み、また出口開口部５１₁にブーツ３９の前端が嵌合してバンド４４で固定される。図２から明らかなように、サイドカバー１３の開口１３₂を吸気の導入に利用するだけでなく、補助ステップ３１をサイドカバー１３の外部に延出させるために利用しているので、開口１３₂の数を最小限に抑えてサイドカバー１３の強度を確保するとともに、美観の低下を回避することができる。
【００２２】
吸気ダクト３８は合成樹脂で一体成形されており、その後端はエアクリーナ３７の入口部３７₁に圧入により固定され、その前端に設けた筒状部３８₁がブーツ３９の後端に圧入されて該ブーツ３９の内部に遊嵌する。また前記吸気管４２に２本のボルト４６，４６で固定したハンガー４７は車体横方向に延びる舌片４７₁を備えており、この舌片４７₁を吸気ダクト３８に形成したスリット３８₂に係止することにより、吸気ダクト３８の前後方向中間部が吊り下げ支持される。吸気ダクト３８の上部には吸気騒音を低減すべくレゾネータ４８が設けられており、また前記筒状部３８₁には後輪Ｗｒが撥ね上げた泥や水を遮ぎるべく環状の鍔部３８₃が一体に形成される。
【００２３】
エアクリーナ３７の出口部３７₂とキャブレタ４１とは相互に嵌合してバンド４５で締結される。またキャブレタ４１と吸気管４２とは、吸気管４２にハンガー４７を固定する前記２本のボルト４６，４６により共締めされる。そして吸気管４２は４本のボルト４９…でエンジンＥに固定される。
【００２４】
次に、前述の構成を備えた本発明の実施例の作用について説明する。
【００２５】
サイドカバー１３の開口１３₂に臨む吸気チャンバー４０の入口開口部５２₁から下室５４に吸入された吸気は、図６に矢印ａで示す如く連通孔５１₂から上室５３に流入し、そこから出口開口部５１₁及び吸気ダクト３８を経てエアクリーナ３７に供給され、エアクリーナ３７で清浄化された吸気はキャブレタ４１で燃料と混合された後、吸気管４２を経てエンジンＥに供給される。
【００２６】
このとき、吸気チャンバー４０が臨むサイドカバー１３の開口１３₂は、前方をレッグシールドフロント部材８及びレッグシールドリヤ部材９で遮られ、且つ下方をステップフロア１０で遮られた位置にあるため、前輪Ｗｆや後輪Ｗｒによって飛散した塵埃や泥水が吸気チャンバー４０に吸い込まれる量を最小限に抑えることができる。しかも、入口開口部５２₁及び出口開口部５１₁間の空気流路はラビリンス状になっており、しかも入口開口部５２₁が出口開口部５１₁よりも低い位置に設けられているので、吸気に含まれる塵埃等を重力で吸気チャンバー４０の底部に落下させ、清浄な吸気だけをエンジンＥに供給することができる。
【００２７】
また、サイドカバー１３に当たった強い横風が入口開口部５２₁から吸気チャンバー４０の下室５４に吹き込んだ場合、連通孔５１₂の高さが入口開口部５２₁の下端の高さよりも低い位置に配置されているため、上室５３及び該上室５３に連なる吸気ダクト３８の内部の圧力が急変することが防止され、エンジンＥの安定した運転が保たれる。このとき、下室５４に流入した空気は、図６に矢印ｃで示す如く排圧用開口部５２₂から吸気チャンバー４０の外部に逃がされるため、吸気系の圧力の急変が一層効果的に防止さる。
【００２８】
尚、入口開口部５２₁に強い横風を受けていない通常時には、大部分の空気が入口開口部５２₁から矢印ａで示す如く下室５４に吸入され、矢印ｂで示す如く排圧用開口部５２₂から吸入される空気は僅かな量であり、これによりリヤカバー１２やサイドカバー１３内に後輪Ｗｒが巻き上げた塵埃等が排圧用開口部５２₂から吸入されることはない。なぜならば、排圧用開口部５２₂の面積は入口開口部５２₁の面積よりも小さく形成されており、しかも入口開口部５２₁と連通孔５１₂との距離が、排圧用開口部５２₂と連通孔５１₂との距離よりも短く形成されているため、入口開口部５２₁から吸入される空気の流通抵抗が排圧用開口部５２₂から吸入された空気の流通抵抗よりも小さいからである。
【００２９】
また、吸気チャンバー４０をエアクリーナ３７に接続する吸気ダクト３８は、その全長が極めて短く形成されており、且つ急激な屈曲部を持たずに車体前後方向に略直線状に配置されているため、吸気ダクト３８における吸気の吸入抵抗を最小限に抑えてエンジンＥの出力を増加することができる。更に、エンジンＥの熱で温度上昇していないボディＢの外部の空気を吸入することにより、吸気温度を下げてエンジンＥの出力を増加することができる。
【００３０】
自動二輪車Ｖの走行に伴って車体に枢支されたパワーユニットＰが上下揺動したとき、パワーユニットＰと一体で上下揺動する吸気ダクト３８と車体側に固定された吸気チャンバー４０との相対移動は、吸気ダクト３８及び吸気チャンバー４０を相互に接続するブーツ３９の弾性変形により吸収される。
【００３１】
図７及び図８は本発明の第２実施例を示すもので、図７は吸気チャンバーの側面図、図８は図７の８−８線断面図である。
【００３２】
第２実施例の吸気チャンバー４０は吸気チャンバー本体５５とパイプ部材５６とから構成されており、吸気チャンバー本体部５５は２個の取付ブラケット５５₁，５５₁によってサイドカバー１３の内面に固定される。Ｌ字状に湾曲したパイプ部材５６の下部は吸気チャンバー本体部５５の内部を下方に延びており、また上部は吸気チャンバー本体部５５の上部後壁に形成した出口開口部５５₂を貫通して後上方に延び、ブーツ３９を介して吸気ダクト３８の筒状部３８₁に接続される。
【００３３】
吸気チャンバー本体５５の下部側面に形成された入口開口部５５₃はサイドカバー１３の開口１３₂に臨んでおり、この入口開口部５５₃の中央部下端に対して、その近傍に開口するパイプ部材５６の下端は距離αだけ下方に配置されている。また吸気チャンバー本体５５の上端には排圧用開口部５５₄が形成されるとともに、下端には排水用開口部５５₅が形成される。
【００３４】
而して、入口開口部５５₃が出口開口部５５₂よりも低い位置に設けられているので、吸気に含まれる塵埃等を重力で吸気チャンバー４０の底部に落下させ、清浄な吸気だけをエンジンＥに供給することができるのは勿論のこと、強い横風が入口開口部５５₃から吸気チャンバー４０内に吹き込んでも、パイプ部材５６の下端の高さが入口開口部５５₃の中央部下端よりも低い位置に配置されているため、吸気ダクト３８の内部の圧力が急変することが防止されてエンジンＥの安定した運転が保たれる。また吸気チャンバー本体５５に流入した空気は排圧用開口部５５₄から外部に逃がされるため、吸気系の圧力の急変が一層効果的に防止され、更に吸気チャンバー本体５５の底部に溜まった水は排水用開口部５５₅から外部に排出される。しかも第１実施例の吸気チャンバー４０よりも上下方向寸法が小型化されるので、吸気チャンバー４０の最低地上高を高くすることができる。
【００３５】
以上、本発明の実施例を詳述したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。
【００３６】
例えば、実施例では吸気チャンバー４０をサイドカバー１３と別部材で構成しているが、両者を一部材で構成することができる。また実施例では開口１３₁をサイドカバー１３に形成しているが、それを他の任意のボディカバーに形成することができる。
【００３７】
【発明の効果】
以上のように請求項１，２，４に記載された各発明によれば、ステップフロアの後方でシートの下方の車体側部を覆うボディカバーに開口を形成し、この開口に臨むようにボディカバーの内面に設けた吸気チャンバーが、吸気ダクトを接続させる出口開口部を備えるので、パワーユニットの伝動ケースの上方に設けたエアクリーナと吸気チャンバーとを接続する吸気ダクトを直線的に且つ最短距離で配置することが可能となり、吸気抵抗を低減してエンジン出力の増加を図ることができる。しかも吸気チャンバーが臨むボディカバーの開口はステップフロアの後方でシートの下方に設けられているので、前輪や後輪によって飛散した塵埃や泥水を吸い込み難くすることができるだけでなく、エンジンにより加熱されていない低温の空気を吸入してエンジン出力を増加させることができる。また吸気チャンバの入口開口部は、同チャンバの上記出口開口部よりも低い位置にある上、その吸気チャンバー内で入口開口部と出口開口部との間の空気流路がラビリンス状に形成されているので、吸気に含まれる塵埃等を重力で吸気チャンバーの底部に落下させ、清浄な吸気だけをエアクリーナ、延いてはエンジンに供給することができる。
【００３８】
また特に請求項１に記載された発明によれば、吸気チャンバーが入口開口部を備えた下室と出口開口部を備えた上室とに区画されており、これら下室及び上室を相互に連通させる連通孔を、吸気チャンバーの入口開口部の下端よりも低い位置に配置したので、ボディカバーの開口に強い横風が当たった場合に吸気系内の圧力の急変を防止することができる。
【００３９】
また特に請求項３に記載された発明によれば、下室の下部に排圧用開口部を設けたので、ボディカバーの開口に横風が作用した場合に、下室の圧力を排圧用開口部から逃がして吸気系内の圧力の急変を一層効果的に防止することができる。
【００４０】
また特に請求項４に記載された発明によれば、吸気チャンバーは吸気チャンバー本体と、上端が吸気ダクトに接続され下端が吸気チャンバー本体内に開口するパイプ部材とを備えており、このパイプ部材の下端開口部を吸気チャンバーの入口開口部の下端よりも低い位置に配置したので、ボディカバーの開口に強い横風が当たった場合に吸気系内の圧力の急変を防止することができる。
【００４１】
また特に請求項５に記載された発明によれば、吸気チャンバー本体の上部に排圧用開口部を設けると共に、下部に排水用開口部を設けたので、吸気チャンバー本体の圧力を排圧用開口部から逃がして吸気系内の圧力の急変を一層効果的に防止することができるだけでなく、吸気チャンバー本体内に溜まった水を排水用開口部から排出することができる。
【００４２】
また特に請求項６に記載された発明によれば、ボディカバーの開口を通してピリオンライダー用の補助ステップをボディカバーの外側に延出させたので、補助ステップのための特別の開口を形成する必要がなくなり、これによりボディカバーの強度を高めるとともに美観を向上させることができる。
【図面の簡単な説明】
【図１】スクータ型自動二輪車の全体側面図
【図２】図１の要部拡大図
【図３】図２においてサイドカバーを取り外した状態を示す図
【図４】図３の４方向矢視図
【図５】図２の５−５線拡大断面図
【図６】図２の６−６線拡大断面図
【図７】吸気チャンバーの側面図
【図８】図７の８−８線断面図
【符号の説明】
１０ステップフロア
１３サイドカバー（ボディカバー）
１３₂ 開口
２３シート
３０伝動ケース
３１補助ステップ
３７エアクリーナ
３８吸気ダクト
４０吸気チャンバー
５１₁ 出口開口部
５１₂ 連通孔
５２₁ 入口開口部
５２₂ 排圧用開口部
５３上室
５４下室
５５吸気チャンバー本体
５５₂ 出口開口部
５５₃ 入口開口部
５５₄ 排圧用開口部
５５₅ 排水用開口部
Ｐパワーユニット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake air intake structure in a scooter type vehicle in which an air cleaner is supported above a transmission case of a power unit pivotally supported at the rear of a vehicle body so as to be swingable up and down, and air is taken into the air cleaner via an intake duct.
[0002]
[Prior art]
Such an intake air intake structure is known, for example, from Japanese Utility Model Laid-Open No. 64-22692. In this, an intake passage having an air intake port at the upper end is formed in the vertical direction at the front portion of the storage box provided at the lower portion of the seat, and the front end of the intake duct extending forward from the air cleaner is connected to the lower end of the intake passage. Provide structure.
[0003]
[Problems to be solved by the invention]
By the way, the above-mentioned conventional one is advantageous in terms of preventing dust inhalation because the air intake is provided at a high position from the road surface, but the total length of the flow path composed of the intake passage and the intake duct becomes longer, and the intake passage In addition, since the intake ducts are connected at right angles, there is a problem that the intake resistance of intake air increases and the output of the engine decreases.
[0004]
The present invention has been made in view of the above-described circumstances, and an object thereof is to increase the engine output by reducing the intake resistance of intake air while preventing the intake of dust.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention described in claim 1 supports an air cleaner above a transmission case of a power unit pivotally supported at the rear part of a vehicle body so as to be swingable up and down, and air is supplied to the air cleaner through an intake duct. In a scooter type vehicle to be incorporated, an opening is formed in the body cover that covers the side of the vehicle body below the seat behind the step floor, and an intake chamber provided on the inner surface of the body cover so as to face the opening connects the intake duct The upper chamber provided with the outlet opening and the lower chamber provided with the inlet opening located at a position lower than the outlet opening, and a communication hole for communicating the lower chamber and the upper chamber with each other, be disposed at a position lower than the lower end of the inlet opening, the air flow path labyrinthine between the inlet opening and the outlet opening in the intake chamber And characterized in that it is formed.
[0006]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the outlet opening is provided at an upper portion of the intake chamber, and the inlet opening faces the opening of the body cover. it and which is located on the side of the intake chamber.
[0007]
According to a third aspect of the present invention, in addition to the configuration of the second aspect , a discharge opening is provided in a lower portion of the lower chamber.
[0008]
According to a fourth aspect of the present invention, there is provided a scooter type vehicle in which an air cleaner is supported above a transmission case of a power unit pivotally supported at the rear portion of the vehicle body and air is taken into the air cleaner via an intake duct. An opening is formed in the body cover that covers the side of the vehicle body below the seat at the rear of the floor, and the intake chamber provided on the inner surface of the body cover so as to face the opening has an outlet opening at the top of the intake chamber body. In addition, an inlet opening at a position lower than the outlet opening is provided at a side of the main body of the intake chamber so as to face the opening of the body cover , and the upper end of the intake chamber penetrates the outlet opening. with the lower end connected to the intake duct and is provided with a pipe member which opens into the intake chamber body, this The lower end opening of the pipe member be disposed at a position lower than the lower end of the inlet opening, the air flow path between the inlet opening and the pipe member is formed in a labyrinth shape in the intake chamber body It is characterized by.
[0009]
According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect , an exhaust pressure opening is provided in the upper portion of the intake chamber body, and a drainage opening is provided in the lower portion. The invention described in claim 6 is characterized in that, in addition to the structure of claim 1, an auxiliary step for a pillion rider is extended to the outside of the body cover through the opening of the body cover.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0011]
1 to 6 show a first embodiment of the present invention. FIG. 1 is an overall side view of a scooter type motorcycle, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a side cover in FIG. FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3, FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG. 2, and FIG. 6 is an enlarged sectional view taken along line 6-6 in FIG.
[0012]
As shown in FIG. 1, a steel pipe welded frame F constituting the skeleton of a scooter type motorcycle V includes a head pipe 1 and a down tube that is coupled to the head pipe 1 via gussets 2 and 2 and extends downward in the rear of the vehicle body. 3 and left and right main frames 4, 4 branching left and right from the vicinity of the lower end of the down tube 3, extending rearward and upward in the vehicle body, and curved in a U shape at the rear end and continuously connected. The front portions of the left and right main frames 4 and the lower ends of the down tubes 3 are connected by a pair of reinforcing pipes 5 and 5, and the front and rear middle portions and the rear portions of the left and right main frames 4 and 4 extend in the left and right directions of the vehicle body. The first cross member 6 and the second cross member 7 are connected.
[0013]
A synthetic resin body B supported by the frame F includes a leg shield front member 8 that covers the front surface of the head pipe 1 and a leg shield rear member that is coupled to the rear surface of the leg shield front member 8 and covers the rear surface of the head pipe 1. 9, a step floor 10 connected to the lower end of the leg shield rear member 9, an under cover 11 connected to the lower end of the leg shield front member 8, and covering the lower surface of the step floor 10, a rear cover 12 covering the rear of the vehicle body, The left and right side covers 13 and 13 are connected to the step floor 10 and the rear end of the under cover 11 from the left and right front portions.
[0014]
A front wheel Wf whose upper part is covered with a front fender 15 is pivotally supported at the lower end of the front fork 14 rotatably supported by the head pipe 1. The central portion in the left-right direction of the bar handle 18 is coupled to the upper surface of the handle post 17 that extends upward from the upper panel 16 that covers the upper end openings of the leg shield front member 8 and the leg shield rear member 9. A headlight 19 and a speedometer 20 are supported on the handle post 17, and a handle lock device 21 integrally having an ignition switch is supported on the right side surface of the head pipe 1.
[0015]
The front end of the power unit P that pivotally supports the rear wheel Wr at the rear end is supported by the first cross member 6 so as to swing up and down, and the power unit P and the second cross member 7 are connected by the rear cushion 22. A seat 23 on which the rider sits is provided on the upper surface of the rear cover 12.
[0016]
As shown in FIG. 2, the left and right side covers 13, 13 are formed with recesses 13 ₁ , 13 _{1 that} are recessed toward the inside of the vehicle body, and an opening 13 ₂ formed at the center of these recesses 13 ₁ , 13 _1. 13 ₂ , auxiliary steps 31 and 31 for the pillion rider project outward from the vehicle body. The auxiliary steps 31, 31 are supported by the vehicle body as follows. That is, the left and right step stays 33, 33 are fixed to the power unit support brackets 32, 32, which are welded to the left and right main frames 4, 4, respectively, with bolts 34, and the step bars arranged in the vehicle body left-right direction on these step stays 33, 33. The left and right ends of 35 are welded and reinforced. The auxiliary steps 31, 31 are fixed to the left and right step stays 33, 33 and the left and right ends of the step bar 35.
[0017]
Next, the structure of the intake system of the power unit P will be described with reference to FIGS.
[0018]
An air cleaner 37 is supported by bolts 36 on the upper surface of the transmission case 30 of the power unit P. The inlet portion 37 ₁ of the air cleaner 37 rear end of the intake duct 38 extending toward the front of the vehicle body are connected, the front end of the intake duct 38 through the boot 39 made of rubber formed in a bellows shape, the left side of the vehicle body side cover 13 is connected to an intake chamber 40 fixed to the inner surface of 13. The outlet 37 ₂ of the air cleaner 37 is connected to the crankcase of the engine E through the carburetor 41 and the intake pipe 42.
[0019]
The intake chamber 40 made of synthetic resin is divided into an upper half 51 and a lower half 52, and the upper half 51 is fitted into the inner circumference of the lower half 52 with the outer circumference of the upper half 51 being fitted. The plurality of protrusions 51 ₃ ... Formed in 51 are engaged with a plurality of locking holes 52 ₃ formed in the lower half 52 to be integrally coupled. Each mounting bracket 51 to the front and rear of the upper half 51 _4, 51 ₄ and is projected, projecting screws 43, 43 penetrating these mounting brackets 51 _4, 51 ₄ to the inner surface of the side cover 13 The intake chamber 40 is fixed to the inner surface of the side cover 13 by being screwed into the boss portions 13 ₃ and 13 ₃ . The Figure 5 but the fixed portion by the rear of the mounting bracket 51 ₄ are shown, the same structure is also fixed part by a front portion of the mounting bracket 51 _4.
[0020]
Upper half 51 inlet opening 52 ₁ provided with the communicating hole 51 ₂ which opens downwardly at the bottom with an outlet opening 51 ₁ and the lower half 52 which is open to the left on the side that is open rearwardly at the top comprising a discharge pressure opening 52 ₂ which opens downwardly at the bottom provided with a. Height 6 For obvious way communication hole 51 ₂ is disposed in position lower distance α than the height of the lower end of the inlet opening 52 _1. The area of the discharge pressure opening 52 ₂ is smaller than the area of the inlet opening 52 ₁ of the area and the communication hole 51 _2.
[0021]
When the intake chamber 40 is attached to the side cover 13, the inlet opening 52 ₁ faces the rear part of the opening 13 ₂ of the side cover 13, and the front end of the boot 39 is fitted into the outlet opening 51 _{1 so} that the band 44 Fixed. As apparent from FIG. 2, not only to utilize an opening 13 ₂ in the side cover 13 to the introduction of the intake, the use of the auxiliary step 31 in order to extend to the outside of the side cover 13, an opening 13 ₂ As a result, the strength of the side cover 13 can be ensured by minimizing the number of the above and the appearance can be avoided.
[0022]
Intake duct 38 are integrally molded of a synthetic resin, a rear end is fixed by press-fitting the inlet portion 37 ₁ of the air cleaner 37, the tubular portion 38 ₁ which is provided at its front end is pressed into the rear end of the boot 39 the It fits loosely inside the boot 39. A hanger 47 fixed to the intake pipe 42 with two bolts 46 and 46 is provided with a tongue piece 47 ₁ extending in the lateral direction of the vehicle body. The tongue piece 47 ₁ is associated with a slit 38 ₂ formed in the intake duct 38. By stopping, the intermediate portion in the front-rear direction of the intake duct 38 is supported by being suspended. A resonator 48 is provided at the upper portion of the intake duct 38 to reduce intake noise, and the tubular portion 38 ₁ has an annular flange 38 ₃ to block mud and water repelled by the rear wheel Wr. Are integrally formed.
[0023]
The outlet portion 37 ₂ and the carburetor 41 of the air cleaner 37 is fastened by a band 45 fitted to each other. The carburetor 41 and the intake pipe 42 are fastened together by the two bolts 46 and 46 that fix the hanger 47 to the intake pipe 42. The intake pipe 42 is fixed to the engine E with four bolts 49.
[0024]
Next, the operation of the embodiment of the present invention having the above-described configuration will be described.
[0025]
The intake air sucked into the lower chamber 54 from the inlet opening 52 ₁ of the intake chamber 40 facing the opening 13 ₂ of the side cover 13 flows into the upper chamber 53 from the communication hole 51 _{2 as} indicated by an arrow a in FIG. Then, the air is supplied to the air cleaner 37 via the outlet opening 51 ₁ and the intake duct 38, and the intake air cleaned by the air cleaner 37 is mixed with fuel by the carburetor 41 and then supplied to the engine E via the intake pipe 42.
[0026]
At this time, the opening 13 ₂ in the side cover 13 which faces the intake chamber 40, since the blocked the forward leg shield front member 8 and the leg shield the rear member 9 and located downward in blocked position in step floor 10, a front wheel The amount of dust and muddy water scattered by the Wf and the rear wheel Wr is sucked into the intake chamber 40 can be minimized. Moreover, the air flow path between the inlet opening 52 ₁ and the outlet opening 51 ₁ has a labyrinth shape, and the inlet opening 52 ₁ is provided at a position lower than the outlet opening 51 _1. It is possible to drop dust contained in the bottom of the intake chamber 40 by gravity and supply only clean intake air to the engine E.
[0027]
Furthermore, when a strong cross wind which hits the side cover 13 is blown into from the inlet opening 52 ₁ in the lower chamber 54 of the intake chamber 40, a position lower than the height of the lower end of the height of the communication hole 51 ₂ is the inlet opening 52 ₁ Therefore, the pressure inside the upper chamber 53 and the intake duct 38 connected to the upper chamber 53 is prevented from changing suddenly, and the engine E can be stably operated. At this time, the air flowing into the lower chamber 54, because it is released to the outside of the intake chamber 40 from the discharge pressure opening 52 ₂ as indicated by an arrow c in FIG. 6, sudden change in the pressure of the intake system is more effectively prevented monkey .
[0028]
During normal times when the inlet opening 52 ₁ is not receiving a strong crosswind, most of the air is sucked into the lower chamber 54 as indicated by the arrow a from the inlet opening 52 _1, and the exhaust pressure opening 52 as indicated by the arrow b. the air drawn from the ₂ a small amount, thereby dust the rear wheel Wr is wound on the rear cover 12 and side cover 13 are not biased suction from the exhaust pressure opening 52 _2. This is because the area of the exhaust opening 52 ₂ is smaller than the area of the inlet opening 52 ₁ , and the distance between the inlet opening 52 ₁ and the communication hole 51 ₂ is the same as that of the exhaust opening 52 ₂ . This is because the flow resistance of the air sucked from the inlet opening 52 ₁ is smaller than the flow resistance of the air sucked from the exhaust pressure opening 52 ₂ because it is formed shorter than the distance to the communication hole 51 _2. .
[0029]
The intake duct 38 that connects the intake chamber 40 to the air cleaner 37 is formed with a very short overall length, and is disposed substantially linearly in the longitudinal direction of the vehicle body without having a sharp bend. The output of the engine E can be increased by minimizing the intake resistance of the intake air in the duct 38. Further, by sucking air outside the body B that has not risen in temperature due to the heat of the engine E, the intake air temperature can be lowered and the output of the engine E can be increased.
[0030]
When the power unit P pivotally supported by the vehicle body as the motorcycle V travels swings up and down, the relative movement between the intake duct 38 that swings up and down integrally with the power unit P and the intake chamber 40 fixed to the vehicle body side is as follows. These are absorbed by elastic deformation of the boot 39 connecting the intake duct 38 and the intake chamber 40 to each other.
[0031]
7 and 8 show a second embodiment of the present invention. FIG. 7 is a side view of the intake chamber, and FIG. 8 is a sectional view taken along line 8-8 of FIG.
[0032]
The intake chamber 40 of the second embodiment is composed of an intake chamber body 55 and a pipe member 56, and the intake chamber body 55 is fixed to the inner surface of the side cover 13 by two mounting brackets 55 ₁ and 55 ₁ . . The lower portion of the pipe member 56 is curved in an L shape extends inside the intake chamber body portion 55 downwardly, also top through the outlet opening 55 ₂ formed in the upper rear wall of the intake chamber body portion 55 It extends rearward and upward and is connected to the tubular portion 38 ₁ of the intake duct 38 via a boot 39.
[0033]
Inlet opening 55 ₃ formed on the lower side of the intake chamber body 55 faces the opening 13 _{and second} side cover 13, the central portion the lower end of the inlet opening 55 _3, the pipe member which opens in the vicinity The lower end of 56 is disposed below the distance α. Also the upper end of the intake chamber body 55 with exhaust pressure opening 55 ₄ are formed, the lower end discharge apertures 55 ₅ is formed.
[0034]
And Thus, since the inlet opening 55 ₃ is provided at a position lower than the outlet opening 55 _2, dust and the like contained in the intake air is dropped to the bottom of the intake chamber 40 by gravity, only clean air engine We of course can be is fed to the E, be blown strong crosswind from the inlet opening 55 ₃ in the intake chamber 40, than the central portion the lower end height of the lower end of the inlet opening 55 ₃ of the pipe member 56 Since it is disposed at a low position, the pressure inside the intake duct 38 is prevented from changing suddenly, and the engine E can be stably operated. Since the air flowing into the intake chamber body 55 is released to the outside from the exhaust pressure opening 55 _4, a sudden change of pressure in the intake system is more effectively prevented, further accumulated in the bottom portion of the intake chamber body 55 water drainage It is discharged from the use openings 55 ₅ to outside. Moreover, since the vertical dimension is made smaller than that of the intake chamber 40 of the first embodiment, the minimum ground clearance of the intake chamber 40 can be increased.
[0035]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0036]
For example, in the embodiment, the intake chamber 40 is composed of a separate member from the side cover 13, but both can be composed of a single member. Although in the embodiment forms the opening 13 ₁ in the side cover 13, it is possible to form it into any other body cover.
[0037]
【The invention's effect】
As described above, according to the first, second , and fourth aspects of the present invention, an opening is formed in the body cover that covers the side of the vehicle body below the seat at the rear of the step floor, and the body cover is disposed so as to face the opening. Since the intake chamber provided on the inner surface has an outlet opening for connecting the intake duct, the intake duct connecting the air cleaner and the intake chamber provided above the transmission case of the power unit should be arranged linearly and at the shortest distance. This makes it possible to reduce the intake resistance and increase the engine output. Moreover, the body cover opening facing the intake chamber is located behind the step floor and below the seat, making it difficult not to inhale dust and muddy water scattered by the front and rear wheels, and is not heated by the engine. Engine power can be increased by inhaling cold air. In addition, the inlet opening of the intake chamber is at a position lower than the outlet opening of the chamber, and an air flow path between the inlet opening and the outlet opening is formed in a labyrinth shape in the intake chamber. As a result, dust or the like contained in the intake air can be dropped to the bottom of the intake chamber by gravity, and only clean intake air can be supplied to the air cleaner and thus the engine.
[0038]
In particular , according to the first aspect of the invention, the intake chamber is divided into a lower chamber having an inlet opening and an upper chamber having an outlet opening, and the lower chamber and the upper chamber are mutually connected. Since the communicating hole to be communicated is disposed at a position lower than the lower end of the inlet opening of the intake chamber, it is possible to prevent a sudden change in the pressure in the intake system when a strong cross wind strikes the opening of the body cover.
[0039]
Further, according to the invention described in claim 3 , since the exhaust pressure opening is provided in the lower part of the lower chamber, when a cross wind acts on the opening of the body cover, the pressure in the lower chamber is released from the exhaust opening. Thus, a sudden change in pressure in the intake system can be prevented more effectively.
[0040]
In particular , according to the invention described in claim 4 , the intake chamber includes an intake chamber body, and a pipe member having an upper end connected to the intake duct and a lower end opened into the intake chamber body. Since the lower end opening is disposed at a position lower than the lower end of the inlet opening of the intake chamber, it is possible to prevent a sudden change in the pressure in the intake system when a strong cross wind strikes the opening of the body cover.
[0041]
According to the invention described in claim 5 in particular , since the exhaust pressure opening is provided in the upper part of the intake chamber main body and the drainage opening is provided in the lower part, the pressure of the intake chamber main body is controlled from the exhaust pressure opening. Not only can it escape and prevent sudden changes in the pressure in the intake system more effectively, but also the water accumulated in the intake chamber body can be discharged from the drain opening.
[0042]
According to the invention described in claim 6 in particular , since the auxiliary step for the pillion rider is extended to the outside of the body cover through the opening of the body cover, it is not necessary to form a special opening for the auxiliary step. Thereby, the strength of the body cover can be increased and the beauty can be improved.
[Brief description of the drawings]
FIG. 1 is an overall side view of a scooter type motorcycle. FIG. 2 is an enlarged view of the main part of FIG. 1. FIG. 3 is a view showing a state in which a side cover is removed. 5 is an enlarged cross-sectional view taken along line 5-5 in FIG. 2. FIG. 6 is an enlarged cross-sectional view taken along line 6-6 in FIG. 2. FIG. 7 is a side view of the intake chamber. Figure [Explanation of symbols]
10 Step floor 13 Side cover (Body cover)
13 ₂ opening 23 seat 30 transmission case 31 auxiliary step 37 air cleaner 38 intake duct 40 intake chamber 51 ₁ outlet opening 51 ₂ communication hole 52 ₁ inlet opening 52 ₂ exhaust pressure opening 53 upper chamber 54 lower chamber 55 intake chamber main body 55 ₂ Opening opening 55 ₃ Inlet opening 55 ₄ Exhaust pressure opening 55 ₅ Drainage opening P Power unit

Claims

A scooter type in which an air cleaner (37) is supported above a transmission case (30) of a power unit (P) pivotally supported at the rear of the vehicle body so as to be swingable up and down, and air is taken into the air cleaner (37) through an intake duct (38). In the vehicle,
An opening (13 ₂ ) is formed in the body cover (13) covering the side of the vehicle body below the seat (23) behind the step floor (10),
An intake chamber (40) provided on the inner surface of the body cover (13) so as to face the opening (13 ₂ ) has an upper chamber (53) provided with an outlet opening (51 ₁ ) for connecting the intake duct (38). ) And a lower chamber (54) having an inlet opening (52 ₁ ) at a position lower than the outlet opening (51 ₁ ) , and the lower chamber (54) and the upper chamber (53). ) the communication hole for communicating with each other (51 _2), said inlet opening (52 ₁₎ be disposed at a position lower than the lower end of said inlet openings in an intake chamber (40) in (52 ₁₎ An intake air intake structure in a scooter type vehicle, wherein an air flow path between the air outlet and the outlet opening (51 ₁ ) is formed in a labyrinth shape.

The outlet opening (51 ₁ ) is provided in the upper part of the intake chamber (40), and the inlet opening (52 ₁ ) faces the opening (13 ₂ ) of the body cover (13) so as to face the intake chamber. The intake air intake structure in a scooter type vehicle according to claim 1, wherein the intake air intake structure is provided on a side portion of (40) .

The intake air intake structure in a scooter type vehicle according to claim 2 , wherein a discharge pressure opening (52 ₂ ) is provided in a lower portion of the lower chamber (54).

A scooter type in which an air cleaner (37) is supported above a transmission case (30) of a power unit (P) pivotally supported at the rear of the vehicle body so as to be swingable up and down, and air is taken into the air cleaner (37) through an intake duct (38). In the vehicle,
An opening (13 ₂ ) is formed in the body cover (13) covering the side of the vehicle body below the seat (23) behind the step floor (10) ,
The opening intake chamber (40) provided on the inner surface of the body cover so as to face the (13 ₂₎ (13), the outlet opening (55 ₂₎ is provided in its upper part of the intake chamber body (55), An inlet opening (55 ₃ ) at a position lower than the outlet opening (55 ₂ ) is provided on the side of the intake chamber body (55) so as to face the opening (13 ₂ ) of the body cover (13). And
The intake chamber (40), upper end the outlet opening a pipe member (55 ₂₎ of the lower end is connected to the intake duct through (38) to open to the intake chamber body (55) in (56) together provided with a lower end opening is the inlet opening (55 ₃₎ are located lower than the lower end of the inlet opening in the intake chamber body (55) of the pipe member (56) ( 55 ₃ ) and an intake air intake structure in a scooter type vehicle , wherein an air flow path between the pipe member (56) is formed in a labyrinth shape .

The scooter type vehicle according to claim 4 , wherein an exhaust pressure opening (55 ₄ ) is provided at an upper portion of the intake chamber body (55), and a drainage opening (55 ₅ ) is provided at a lower portion. Intake air intake structure.

The intake air in the scooter type vehicle according to claim 1, wherein an auxiliary step (31) for a pillion rider is extended to the outside of the body cover (13) through the opening (13 ₂ ) of the body cover (13). Intake structure.