JP4494679B2

JP4494679B2 - Intake device for motorcycle

Info

Publication number: JP4494679B2
Application number: JP2001234272A
Authority: JP
Inventors: 秀敏豊田; 淳針生
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2001-08-01
Filing date: 2001-08-01
Publication date: 2010-06-30
Anticipated expiration: 2021-08-01
Also published as: JP2003042023A

Description

【０００１】
【発明の属する技術分野】
本発明は、エンジンへの吸入空気量を確保し、更に、軽量化、コンパクト化及び吸気騒音の低減を図るのに好適な自動二輪車の吸気装置に関する。
【０００２】
【従来の技術】
自動二輪車には、前部外側を覆うカウルの内側にエンジンの吸気系へ外気を導く通路を設けたものがある。この技術を次図で説明する。
図８は従来の外気導入用の通路を説明する断面図であり、カウル１００を構成するアッパカウル１０１及びミドルカウル１０２の内側に通路１０３を設けた状態を示す。
通路１０３は閉断面形状に形成したものであり、カウル１００との干渉を防ぐためにクリアランスＣを設けてある。
【０００３】
【発明が解決しようとする課題】
上記したカウル１００と通路１０３との間にクリアランスＣを設けたことで、通路１０３の断面積が小さくなり、必要な吸入空気量を確保することが難しくなる。しかも、カウル１００と通路１０３との間にデッドスペース１０４が生じる。更に、自動二輪車においても自動車と同様に、省資源、低燃費の観点から軽量化、コンパクト化が求められ、環境対策の観点から吸気騒音の低減が求められている。
【０００４】
そこで、本発明の目的は、自動二輪車の吸気装置を改良することで、エンジンへの吸入空気量を増し、更に、軽量化、コンパクト化及び吸気騒音の低減を図ることにある。
【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は、車体を覆うカウルの内側に、エンジンへ外気を供給するための通路を設け、通路をカウルとこのカウルの内面に取付けた通路形成部材とで一体的に形成し、通路の一部に吸気騒音を低減するレゾネータを設けた自動二輪車の吸気装置において、通路形成部材に、通路の入口からエンジン側に延びる主通路溝と、この主通路溝の入口側に主通路溝にほぼ直交させて連結するとともに先端を閉じた縦長溝とを設け、この縦長溝とカウルの内面とでレゾネータを形成したことを特徴とする。
【０００６】
通路をカウルと通路形成部材とで一体的に形成したことで、従来のようにカウルとは別体の通路を設けるのに比べて、本発明では、通路形成部材を完全な閉断面構造にしなくてもよく、通路形成部材を軽量にすることができる。
【０００７】
また、カウルの内面に通路形成部材を直接に取付けるため、従来のようにカウルと通路形成部材との間に隙間を設けなくてもよいために、通路の断面積を大きくすることができる。
【０００８】
更に、カウルの内側の通路にレゾネータを設けたことで、カウルの内側のスペースを有効に利用することができ、自動二輪車をコンパクトにしつつ吸気騒音を低減することができる。
加えて、通路形成部材の主通路溝と縦長溝とをほぼ直交させることで、通路形成部材を略Ｌ字形に形成することができ、この通路形成部材でカウルを縦方向及び横方向の両方に補強することができるため、カウルの板厚を薄くすることができ、カウルを軽量なものにすることができる。
また、カウルと縦長溝とを合せるだけでレゾネータを簡単に形成することができ、レゾネータを通路に特別に設けるのに比べて製造コストを低減することができる。
【０００９】
請求項２は、レゾネータは、前部がカウルの前端を内側に折り曲げることで塞がれ、下部及び後部が通路形成部材の縁部で塞がれることで、主通路溝側にのみ開口されることを特徴とする。
【００１１】
【発明の実施の形態】
本発明の実施の形態を添付図に基づいて以下に説明する。なお、図面は符号の向きに見るものとする。
図１は本発明に係る吸気装置を採用した自動二輪車の側面図であり、自動二輪車１０は、ヘッドパイプ１１から車体後方でやや下方に左右一対のメインフレーム１２，１２（奥側のメインフレーム１２は不図示）を延ばし、これらのメインフレーム１２，１２の下部にＶ型５気筒エンジン１３を取付けるとともにメインフレーム１２，１２の後部にピボット軸１４を介してスイングアーム１５を上下スイング可能に取付け、このスイングアーム１５の前部上部にリヤクッションユニット１６の上端を取付けるとともにスイングアーム１５の後端部に後輪１７を取付け、リヤクッションユニット１６の下端をリンク装置１８を介してメインフレーム１２の後部下端部に取付け、エンジン１３の前側のシリンダヘッド２１から気筒毎に設けた排気管２３〜２５を後方へ延ばし、これらの排気管２３〜２５を奥側の右マフラ２６に連結し、エンジン１３の後側のシリンダヘッド２８から気筒毎に設けた排気管３１，３２を後方へ延ばし、これらの排気管３１，３２を手前側の左マフラ３３に連結し、メインフレーム１２，１２の上部から後方へシートを兼ねるシートカウル３４を延ばし、このシートカウル３４の内側に燃料タンク３５を取付け、この燃料タンク３５内に燃料ポンプ３６を配置し、車体を前部から下部に亘ってカウル３８で覆った車両である。
【００１２】
ここで、４１はヘッドパイプ１１に回転可能に取付けたフロントフォーク、４２はフロントフォーク４１の下端に取付けた前輪、４３は前輪４２の上方を覆うフロントフェンダ、４４，４５，４６はカウル３８を構成するアッパカウル、ミドルカウル及びロアカウル、４８はラジエータ、５１はタンクカバーである。
【００１３】
図２は本発明に係る吸気装置を説明する要部側面図であり、カウル３８のミドルカウル４５は、裏面に、エンジン１３（図１参照）の吸気系へ外気を供給するための通路形成部材５５を取付けた部材である。なお、５６は吸気通路の入口としての吸気入口、５７はカウル３８内の空気を外部に排出する排気口、５８・・・（・・・は複数個を示す。以下同様。）はアッパカウル４４とミドルカウル４５、ミドルカウル４５とロアカウル４６とを連結するためのビスである。
【００１４】
図３は本発明に係る吸気装置を構成する通路形成部材を説明する斜視図であり、カウル３８の裏面に取付けた通路形成部材５５は、吸気入口５６（図２参照）側からエンジン１３（図１参照）の側に延びる主通路溝６１と、この主通路溝６１の吸気入口５６側に主通路溝６１にほぼ直交させるように連結するとともに下方へ延ばした縦長溝としてのレゾネータ形成部６２とからなる側面視略Ｌ字状の部材である。６３は主通路溝６１及びレゾネータ形成部６２の縁部であり、ミドルカウル４５の裏面に接着剤等で貼付ける部分である。
【００１５】
主通路溝６１は、吸気入口５６側に複数の穴６５を開けた底壁６６を設け、エンジン１３側に、吸気通路内の空気をエンジン１６側の吸気系に排出するための吸気排出口６７を設けたものである。
レゾネータ形成部６２は、下端及び後部を縁部６３で塞ぐ部分である。
【００１６】
図４は図２の４−４線断面図であり、ミドルカウル４５と通路形成部材５５とで吸気通路７０を形成したことを示す。
吸気通路７０は、ミドルカウル４５の内面４５ａと主通路溝６１とで形成した吸気主通路７１と、ミドルカウル４５の内面４５ａとレゾネータ形成部６２とで形成したレゾネータ７２とからなる。
【００１７】
図２に戻って、レゾネータ７２は、前部をミドルカウル４５の前端４５ｂを内側へ折り曲げることで塞いだ状態にあり、下部及び後部を縁部６３で塞いだ形状であり、吸気主通路７１側にのみ開口する吸気騒音低減のための空気室である。
【００１８】
図５は図２の５−５線断面図であり、吸気主通路７１のエンジン１３（図１参照）側の吸気排出口６７をエンジン１３の吸気系、例えば吸気を一旦溜める吸気ボックス７４に接続したことを示す。
通路形成部材５５は閉断面形状ではないため、従来のような閉断面形状とするのに比べて軽量にすることができる。
【００１９】
図６は図２の６矢視図であり、アッパカウル４４の左右の下部に一対の左右対称なミドルカウル４５，７５を設け、これらのミドルカウル４５，７５にそれぞれ通路形成部材５５，７６を取付けて、吸気通路７０，８０を形成したことを示す。なお、８１は吸気入口、８２は底壁、８３は吸気排出口、８４はレゾネータである。
通路形成部材７６は、通路形成部材５５と左右対称な部材である。
【００２０】
以上に述べた吸気通路７０の作用を次に説明する。なお、吸気通路８０の作用は吸気通路７０の作用と同様であり、説明は省略する。
図７は本発明に係る吸気通路の作用を説明する作用図であり、ミドルカウル４５の一部を破断した状態で説明する。
自動二輪車が走行中には、走行風、即ち外気が吸気入口５６から吸気通路７０内に入り、外気は吸気通路７０内を後方へ流れて吸気排出口６７に至り、この吸気排出口６７からエンジンの吸気系、例えば吸気ボックス内に流れる。
吸気入口５６及び吸気通路７０を外気が流れるときに生じる吸気騒音は、レゾネータ７２で通路の断面積を拡張することで低減することができる。
【００２１】
以上の図１、図２及び図６で説明したように、本発明は第１に、車体を覆うカウル３８の内側に、エンジン１３へ吸気系へ外気を供給するための吸気通路７０，８０を設けた自動二輪車１０の吸気装置において、吸気通路７０，８０をカウル３８とこのカウル３８の内面に取付けた通路形成部材５５，７６とで一体的に形成し、吸気通路７０，８０の一部に吸気騒音を低減するレゾネータ７２，８４を設けたことを特徴とする。
【００２２】
吸気通路７０，８０をカウル３８と通路形成部材５５，７６とで一体的に形成したことで、従来のようにカウルとは別体の通路を設けるのに比べて、本発明では、通路形成部材５５，７６を完全な閉断面構造にしなくてもよく、通路形成部材５５，７６を軽量にすることができる。
【００２３】
また、カウル３８の内面に通路形成部材５５，７６を直接に取付けるため、従来のようにカウル３８と通路形成部材５５，７６との間に隙間を設けなくてもよいために、吸気通路７０，８０の断面積を大きくすることができ、吸気系への吸入空気量を増すことができて、必要な吸入空気量を確保することができる。
【００２４】
更に、カウル３８の内側の吸気通路７０，８０にレゾネータ７２，８４を設けたことで、カウル３８の内側のスペースを有効に利用することができ、自動二輪車１０をコンパクトにしつつ吸気騒音を低減することができる。
また更に、従来のような、通路をカウル内に取付けるための取付部材を本発明では省くことができ、製造コストの低減を図ることができる。
【００２５】
本発明は第２に、図１、図３及び図６において、通路形成部材５５，７６に、吸気通路７０，８０の通路入口５６，８１からエンジン１３側に延びる主通路溝６１と、この主通路溝６１の吸気入口５６，８１側に主通路溝６１にほぼ直交させて連結するとともに先端を閉じたレゾネータ形成部６２とを設け、このレゾネータ形成部６２とカウル３８の内面とでレゾネータ７２，８４を形成したことを特徴とする。
【００２６】
通路形成部材５５，７６の主通路溝６１とレゾネータ形成部６２とをほぼ直交させることで、通路形成部材５５，７６を略Ｌ字形に形成することができ、この通路形成部材５５，７６でカウル３８、特にミドルカウル４５，７５を縦方向及び横方向の両方に補強することができるため、カウル３８、特にミドルカウル４５，７５の板厚を薄くすることができ、ミドルカウル４５，７５を軽量なものにすることができる。
【００２７】
また、カウル３８とレゾネータ形成部６２とを合せるだけでレゾネータ７２，８４を簡単に形成することができ、レゾネータ７２，８４を通路に特別に設けるのに比べて製造コストを低減することができる。
【００２８】
尚、本発明では、通路形成部材の縦長溝を、主通路溝の入口側に主通路溝にほぼ直交させて連結したが、これに限らず、縦長溝を、主通路溝に対して傾斜させてもよいし、また、縦長溝を、主通路溝の中間部に連結してもよい。
【００２９】
【発明の効果】
本発明は上記構成により次の効果を発揮する。
請求項１の自動二輪車の吸気装置は、通路をカウルとこのカウルの内面に取付けた通路形成部材とで一体的に形成し、通路の一部に吸気騒音を低減するレゾネータを設けたので、通路をカウルと通路形成部材とで一体的に形成したことにより、従来のようにカウルとは別体の通路を設けるのに比べて、本発明では、通路形成部材を完全な閉断面構造にしなくてもよく、通路形成部材を軽量にすることができる。従って、自動二輪車の軽量化を図ることができる。
【００３０】
また、カウルの内面に通路形成部材を直接に取付けるため、従来のようにカウルと通路形成部材との間に隙間を設けなくてもよいために、通路の断面積を大きくすることができる。従って、エンジン吸気系の吸入空気量を増やすことができ、例えば、エンジンの出力を向上させることができる。
【００３１】
更に、カウルの内側の通路にレゾネータを設けたことで、カウルの内側のスペースを有効に利用することができ、自動二輪車をコンパクトにしつつ吸気騒音を低減することができる。
【００３２】
さらに、請求項１の自動二輪車の吸気装置は、通路形成部材に、通路の入口からエンジン側に延びる主通路溝と、この主通路溝の入口側に主通路溝にほぼ直交させて連結するとともに先端を閉じた縦長溝とを設け、この縦長溝とカウルの内面とでレゾネータを形成したので、通路形成部材の主通路溝と縦長溝とをほぼ直交させることで、通路形成部材を略Ｌ字形に形成することができ、この通路形成部材でカウルを縦方向及び横方向の両方に補強することができるため、カウルの板厚を薄くできる等により、カウルの軽量化を図ることができる。
【００３３】
また、カウルと縦長溝とを合せるだけでレゾネータを簡単に形成することができ、レゾネータを通路に特別に設けるのに比べて製造コストを低減することができる。
【図面の簡単な説明】
【図１】本発明に係る吸気装置を採用した自動二輪車の側面図
【図２】本発明に係る吸気装置を説明する要部側面図
【図３】本発明に係る吸気装置を構成する通路形成部材を説明する斜視図
【図４】図２の４−４線断面図
【図５】図２の５−５線断面図
【図６】図２の６矢視図
【図７】本発明に係る吸気通路の作用を説明する作用図
【図８】従来の外気導入用の通路を説明する断面図
【符号の説明】
１０…自動二輪車、１３…エンジン、３８…カウル、５５，７６…通路形成部材、５６，８１…入口（吸気入口）、６１…主通路溝、６２…縦長溝（レゾネータ形成部）、６３…縁部、７０，８０…通路（吸気通路）、７２，８４…レゾネータ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake device for a motorcycle that is suitable for securing the amount of intake air to an engine and further reducing the weight, reducing the size, and reducing intake noise.
[0002]
[Prior art]
Some motorcycles are provided with a passage that guides outside air to an intake system of an engine inside a cowl that covers a front outer side. This technique is illustrated in the following figure.
FIG. 8 is a cross-sectional view illustrating a conventional passage for introducing outside air, and shows a state where a passage 103 is provided inside an upper cowl 101 and a middle cowl 102 constituting the cowl 100.
The passage 103 is formed in a closed cross-sectional shape, and a clearance C is provided to prevent interference with the cowl 100.
[0003]
[Problems to be solved by the invention]
By providing the clearance C between the cowl 100 and the passage 103 described above, the cross-sectional area of the passage 103 becomes small, and it becomes difficult to secure a necessary intake air amount. In addition, a dead space 104 is generated between the cowl 100 and the passage 103. Further, in the same way as automobiles, motorcycles are required to be lighter and more compact from the viewpoints of resource saving and fuel efficiency, and to reduce intake noise from the viewpoint of environmental measures.
[0004]
Accordingly, an object of the present invention is to improve the intake device of a motorcycle, thereby increasing the amount of intake air to the engine, and further reducing the weight, downsizing, and reducing intake noise.
[0005]
[Means for Solving the Problems]
Claim 1 in order to achieve the above object, the inside of the cowl covering the vehicle body, a passage for supplying outdoor air to the engine is provided integrally with the passage forming member fitted with a passage to the inner surface of the cowl and the cowl In a motorcycle intake device that is provided with a resonator that reduces intake noise in a part of the passage, a passage forming member includes a main passage groove that extends from the passage entrance to the engine side, and an inlet side of the main passage groove. In addition, a vertically long groove that is connected to the main passage groove substantially orthogonally and has a closed end is provided, and a resonator is formed by the vertically long groove and the inner surface of the cowl .
[0006]
Since the passage is formed integrally with the cowl and the passage forming member, the present invention does not have a completely closed cross-sectional structure in the present invention, compared to the case where a passage separate from the cowl is provided as in the prior art. Alternatively, the passage forming member can be reduced in weight.
[0007]
Further, since the passage forming member is directly attached to the inner surface of the cowl, there is no need to provide a gap between the cowl and the passage forming member as in the prior art, so the cross-sectional area of the passage can be increased.
[0008]
Further, by providing the resonator in the passage inside the cowl, the space inside the cowl can be used effectively, and the intake noise can be reduced while making the motorcycle compact.
In addition, by making the main passage groove and the longitudinal groove of the passage forming member substantially orthogonal to each other, the passage forming member can be formed in a substantially L shape, and the cowl can be formed in both the vertical direction and the horizontal direction with this passage forming member. Since it can be reinforced, the thickness of the cowl can be reduced and the cowl can be made lightweight.
In addition, the resonator can be easily formed only by combining the cowl and the longitudinal groove, and the manufacturing cost can be reduced as compared with the case where the resonator is specially provided in the passage.
[0009]
According to a second aspect of the present invention, the resonator is closed by folding the front end of the cowl inward, and the lower and rear portions are closed by the edge of the passage forming member, so that the resonator is opened only on the main passage groove side. It is characterized by that.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a motorcycle employing an intake device according to the present invention. The motorcycle 10 includes a pair of left and right main frames 12 and 12 (a main frame 12 on the back side) slightly below the head pipe 11 at the rear of the vehicle body. The V-type five-cylinder engine 13 is attached to the lower part of the main frames 12 and 12, and the swing arm 15 is attached to the rear parts of the main frames 12 and 12 via the pivot shaft 14 so as to be able to swing up and down. The upper end of the rear cushion unit 16 is attached to the upper front portion of the swing arm 15 and the rear wheel 17 is attached to the rear end portion of the swing arm 15. The lower end of the rear cushion unit 16 is connected to the rear portion of the main frame 12 via the link device 18. Exhaust gas attached to each cylinder from the cylinder head 21 on the front side of the engine 13 and attached to the lower end 23 to 25 are extended rearward, these exhaust pipes 23 to 25 are connected to the right muffler 26 on the back side, and the exhaust pipes 31 and 32 provided for each cylinder are extended rearward from the cylinder head 28 on the rear side of the engine 13. The exhaust pipes 31 and 32 are connected to the left muffler 33 on the front side, a seat cowl 34 that also serves as a seat extends from the upper part of the main frames 12 and 12 to the rear, and a fuel tank 35 is attached to the inside of the seat cowl 34. In this vehicle, a fuel pump 36 is disposed in the fuel tank 35 and the vehicle body is covered with a cowl 38 from the front to the bottom.
[0012]
Here, 41 is a front fork rotatably attached to the head pipe 11, 42 is a front wheel attached to the lower end of the front fork 41, 43 is a front fender that covers the front wheel 42, and 44, 45, 46 constitute a cowl 38. Upper cowl, middle cowl and lower cowl, 48 is a radiator, and 51 is a tank cover.
[0013]
FIG. 2 is a side view of the main part for explaining the intake device according to the present invention. The middle cowl 45 of the cowl 38 is a passage forming member for supplying outside air to the intake system of the engine 13 (see FIG. 1) on the back surface. 55 is a member to which 55 is attached. Reference numeral 56 denotes an intake inlet as an inlet of the intake passage, 57 denotes an exhaust outlet for discharging the air in the cowl 38 to the outside, 58... (... indicates a plurality, the same applies hereinafter) and the upper cowl 44. A screw for connecting the middle cowl 45, the middle cowl 45 and the lower cowl 46.
[0014]
3 is a perspective view for explaining a passage forming member constituting the intake device according to the present invention. The passage forming member 55 attached to the back surface of the cowl 38 is connected to the engine 13 (see FIG. 2) from the intake inlet 56 (see FIG. 2) side. 1) and a resonator forming portion 62 as a vertically long groove that is connected to the intake passage 56 side of the main passage groove 61 so as to be substantially orthogonal to the main passage groove 61 and extends downward. A substantially L-shaped member in side view. 63 is an edge part of the main channel | path groove | channel 61 and the resonator formation part 62, and is a part affixed on the back surface of the middle cowl 45 with an adhesive agent.
[0015]
The main passage groove 61 is provided with a bottom wall 66 having a plurality of holes 65 on the intake inlet 56 side, and an intake exhaust port 67 for discharging the air in the intake passage to the intake system on the engine 16 side on the engine 13 side. Is provided.
The resonator forming portion 62 is a portion that covers the lower end and the rear portion with the edge portion 63.
[0016]
4 is a cross-sectional view taken along line 4-4 of FIG. 2, and shows that an intake passage 70 is formed by the middle cowl 45 and the passage forming member 55. FIG.
The intake passage 70 includes an intake main passage 71 formed by the inner surface 45a of the middle cowl 45 and the main passage groove 61, and a resonator 72 formed by the inner surface 45a of the middle cowl 45 and the resonator forming portion 62.
[0017]
Returning to FIG. 2, the resonator 72 has a shape in which the front part is closed by bending the front end 45 b of the middle cowl 45 inward, and the lower part and the rear part are closed by the edge part 63, and the intake main passage 71 side It is an air chamber for reducing intake noise that opens only in the air.
[0018]
FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 2, and an intake exhaust port 67 on the engine 13 (see FIG. 1) side of the intake main passage 71 is connected to an intake system of the engine 13, for example, an intake box 74 for temporarily storing intake air. Indicates that
Since the passage forming member 55 does not have a closed cross-sectional shape, it can be made lighter than a conventional closed cross-sectional shape.
[0019]
6 is a view taken in the direction of the arrow 6 in FIG. 2, and a pair of symmetrical middle cowls 45 and 75 are provided at the left and right lower portions of the upper cowl 44, and passage forming members 55 and 76 are attached to the middle cowls 45 and 75, respectively. Thus, it is shown that the intake passages 70 and 80 are formed. In addition, 81 is an intake inlet, 82 is a bottom wall, 83 is an intake discharge port, 84 is a resonator.
The passage forming member 76 is a member symmetrical to the passage forming member 55.
[0020]
Next, the operation of the intake passage 70 described above will be described. The action of the intake passage 80 is the same as the action of the intake passage 70, and a description thereof will be omitted.
FIG. 7 is an operation diagram for explaining the operation of the intake passage according to the present invention, and will be described in a state where a part of the middle cowl 45 is broken.
While the motorcycle is traveling, traveling wind, that is, outside air enters the intake passage 70 from the intake inlet 56, and the outside air flows backward through the intake passage 70 to the intake discharge port 67, and the intake discharge port 67 passes through the engine. Flows into an intake system, for example, an intake box.
Intake noise generated when outside air flows through the intake inlet 56 and the intake passage 70 can be reduced by expanding the cross-sectional area of the passage with the resonator 72.
[0021]
As described above with reference to FIGS. 1, 2, and 6, the present invention firstly has intake passages 70, 80 for supplying outside air to the intake system to the engine 13 inside the cowl 38 that covers the vehicle body. In the intake device of the motorcycle 10 provided, the intake passages 70 and 80 are integrally formed by a cowl 38 and passage forming members 55 and 76 attached to the inner surface of the cowl 38, and are formed in a part of the intake passages 70 and 80. Resonators 72 and 84 for reducing intake noise are provided.
[0022]
Since the intake passages 70 and 80 are integrally formed by the cowl 38 and the passage forming members 55 and 76, the passage forming member is provided in the present invention as compared to the case where a passage separate from the cowl is provided as in the prior art. 55 and 76 do not need to have a complete closed cross-sectional structure, and the passage forming members 55 and 76 can be reduced in weight.
[0023]
Further, since the passage forming members 55 and 76 are directly attached to the inner surface of the cowl 38, there is no need to provide a gap between the cowl 38 and the passage forming members 55 and 76 as in the prior art. The cross-sectional area of 80 can be increased, the amount of intake air to the intake system can be increased, and the necessary amount of intake air can be ensured.
[0024]
Further, by providing the resonators 72 and 84 in the intake passages 70 and 80 inside the cowl 38, the space inside the cowl 38 can be used effectively, and the intake noise is reduced while making the motorcycle 10 compact. be able to.
Furthermore, the conventional mounting member for mounting the passage in the cowl can be omitted in the present invention, and the manufacturing cost can be reduced.
[0025]
The present invention secondly, in FIGS. 1, 3 and 6, the passage forming members 55, 76 have a main passage groove 61 extending from the passage inlets 56, 81 of the intake passages 70, 80 toward the engine 13, and the main passage groove 61. A resonator forming portion 62 is provided on the intake inlets 56 and 81 side of the passage groove 61 so as to be substantially orthogonal to the main passage groove 61 and closed at the tip. The resonator forming portion 62 and the inner surface of the cowl 38 are connected to the resonator 72, 84 is formed.
[0026]
By making the main passage groove 61 of the passage forming members 55 and 76 and the resonator forming portion 62 substantially orthogonal to each other, the passage forming members 55 and 76 can be formed in a substantially L shape. 38, particularly the middle cowls 45, 75 can be reinforced in both the longitudinal and lateral directions, so that the thickness of the cowl 38, particularly the middle cowls 45, 75 can be reduced, and the middle cowls 45, 75 are lighter. Can be made.
[0027]
Further, the resonators 72 and 84 can be formed simply by combining the cowl 38 and the resonator forming portion 62, and the manufacturing cost can be reduced as compared with the case where the resonators 72 and 84 are specially provided in the passage.
[0028]
In the present invention, the longitudinal groove of the passage forming member is connected to the inlet side of the main passage groove so as to be substantially orthogonal to the main passage groove. However, the present invention is not limited to this, and the longitudinal groove is inclined with respect to the main passage groove. Alternatively, the vertically long groove may be connected to an intermediate portion of the main passage groove.
[0029]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
In the intake device for a motorcycle according to claim 1, the passage is integrally formed by a cowl and a passage forming member attached to the inner surface of the cowl, and a resonator for reducing intake noise is provided in a part of the passage. Since the cowl and the passage forming member are integrally formed, the passage forming member does not have a completely closed cross-sectional structure in the present invention, as compared to the case where a passage separate from the cowl is provided as in the prior art. In addition, the passage forming member can be reduced in weight. Accordingly, the weight of the motorcycle can be reduced.
[0030]
Further, since the passage forming member is directly attached to the inner surface of the cowl, there is no need to provide a gap between the cowl and the passage forming member as in the prior art, so the cross-sectional area of the passage can be increased. Therefore, the amount of intake air in the engine intake system can be increased, and for example, the output of the engine can be improved.
[0031]
Further, by providing the resonator in the passage inside the cowl, the space inside the cowl can be used effectively, and the intake noise can be reduced while making the motorcycle compact.
[0032]
Further, the intake device for a motorcycle according to claim 1 is connected to the passage forming member and a main passage groove extending from the entrance of the passage toward the engine side, and is connected to the entrance side of the main passage groove so as to be substantially orthogonal to the main passage groove. A longitudinal groove with a closed tip is provided, and a resonator is formed by the longitudinal groove and the inner surface of the cowl. Therefore, the passage forming member is substantially L-shaped by making the main passage groove and the longitudinal groove of the passage forming member substantially orthogonal to each other. Since the cowl can be reinforced in both the vertical direction and the horizontal direction with this passage forming member, the weight of the cowl can be reduced by reducing the thickness of the cowl.
[0033]
In addition, the resonator can be easily formed only by combining the cowl and the longitudinal groove, and the manufacturing cost can be reduced as compared with the case where the resonator is specially provided in the passage.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle adopting an intake device according to the present invention. FIG. 2 is a side view of a main part illustrating the intake device according to the present invention. FIG. 3 is a passage forming the intake device according to the present invention. FIG. 4 is a sectional view taken along line 4-4 in FIG. 2. FIG. 5 is a sectional view taken along line 5-5 in FIG. 2. FIG. 6 is a sectional view taken along arrow 6 in FIG. FIG. 8 is a sectional view for explaining a conventional outside air introduction passage.
DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 13 ... Engine, 38 ... Cowl, 55, 76 ... Passage formation member, 56, 81 ... Inlet (intake inlet), 61 ... Main passage groove, 62 ... Longitudinal groove (resonator formation part), 63 ... Edge 70 , 80 ... passage (intake passage), 72, 84 ... resonator.

Claims

A passage for supplying outside air to the engine is provided inside the cowl that covers the vehicle body .
In the intake device for a motorcycle, the passage is formed integrally with the cowl and a passage forming member attached to the inner surface of the cowl, and a resonator for reducing intake noise is provided in a part of the passage .
The passage forming member is provided with a main passage groove extending from the entrance of the passage toward the engine side, and a vertically long groove connected to the entrance side of the main passage groove so as to be substantially orthogonal to the main passage groove and having a closed end, An intake device for a motorcycle , wherein the resonator is formed by the longitudinal groove and the inner surface of the cowl .

The resonator is closed at the front by bending the front end of the cowl inward, and the lower and rear portions are closed by the edge of the passage forming member, so that the resonator is opened only on the main passage groove side. The intake device for a motorcycle according to claim 1.