JP2004169708A

JP2004169708A - Exhaust structure for motorcycle

Info

Publication number: JP2004169708A
Application number: JP2004065664A
Authority: JP
Inventors: Hirobumi Fukunaga; 博文福永; Hisao Nishiura; 久生西浦
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2004-03-09
Filing date: 2004-03-09
Publication date: 2004-06-17
Anticipated expiration: 2021-08-31
Also published as: JP3684234B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust structure of a collected type to be easily manufactured, and have simple appearance. <P>SOLUTION: Four exhaust pipes 12 coming from an exhaust port of a serial four-cylinder engine 11 are primarily collected under the engine 11 to two first collecting pipes 13, and then secondarily collected to one second collecting pipe 14. The second collecting pipe 14 is connected to a branch pipe 15 that is vertically disposed. The branch pipe passes a front center part of a rear fork 5 from the underside upward to be branched to two branch pipes 26 above the rear fork 5. They are connected to a muffler covered with a right and a left muffler covers 17. This exhaust structure is roughly symmetric in a plan view. The branch pipe 15 has a press-molded combined structure, and includes catalyst. <P>COPYRIGHT: (C)2004,JPO

Description

この発明は自動２輪車の排気構造、特に多気筒エンジンの排気集合構造に関する。 The present invention relates to an exhaust structure of a motorcycle, and more particularly to an exhaust assembly structure of a multi-cylinder engine.

多気筒エンジン、例えば直列４気筒エンジンの場合、その排気管は４本→２本→１本等に本数が漸減するように集合変化して、最終的に車体後方の左右いずれか側に配置されたマフラーへ導かれるようになっている集合形式のものが公知である。
特開２００１−１１４１８１号公報 In the case of a multi-cylinder engine, for example, an in-line four-cylinder engine, the exhaust pipes are collectively changed so as to gradually reduce the number of exhaust pipes from four to two to one, and finally arranged on the left or right side of the rear of the vehicle body. There is known a collective type that is led to a muffler.
JP 2001-114181 A

上記集合形式の場合、集合排気管は次第に車体の左右いずれか側へ片寄るように配管される。したがって、集合管の形状が複雑化し、外観も複雑になり易い。そこで本願発明の目的は、製造容易でかつ外観をすっきりさせることができ、併せて触媒有無の仕様に対応できる排気構造を実現する。 In the case of the above-mentioned collective type, the collective exhaust pipe is piped so as to gradually shift to either the left or right side of the vehicle body. Therefore, the shape of the collecting pipe becomes complicated, and the appearance tends to be complicated. Therefore, an object of the present invention is to realize an exhaust structure that can be easily manufactured and that can have a clean appearance, and that can cope with specifications with or without a catalyst.

上記課題を解決するため本願発明における自動２輪車の排気構造は、多気筒エンジンから延出する複数の排気管をエンジン前方から下方へ通して集合させ、車体フレームに揺動自在に支持されたリヤフォークの左右アーム部を連結するクロス部の前方空間を通過させた自動２輪車の排気構造において、
前記自動２輪車は集合管を左右２本に分岐させる分岐管と、排気ガス浄化用の触媒とを備え、前記分岐管は前記リヤフォークの前端部を上下方向に交差するとともに内部に前記触媒を配置した最中合わせ構造とされることを特徴とする。 In order to solve the above problems, the exhaust structure of a motorcycle according to the present invention is configured such that a plurality of exhaust pipes extending from a multi-cylinder engine are passed downward from the front of the engine and assembled to be swingably supported by a body frame. In the exhaust structure of a motorcycle passing through a space in front of a cross portion connecting left and right arms of a rear fork,
The motorcycle includes a branch pipe that branches the collecting pipe into two right and left pipes, and a catalyst for purifying exhaust gas. The branch pipe crosses a front end of the rear fork in a vertical direction and has the catalyst therein. Are arranged in the middle.

本願発明によれば、分岐管を最中合わせ構造にしたので、比較的簡単かつ安価に製造できる。またこの最中合わせ構造をなす分岐管の内部に触媒を設けるようにたので、触媒を必要とする仕様と不要の仕様の双方について共用化できる。そのうえ、車体中央部で集合管を上方へ立ち上げ、リヤフォークの前端部と交差させて上方へ延ばしてから左右に分岐させたので、見栄えが良く外観もすっきりしたものになる。 According to the present invention, since the branch pipe is formed in the middle structure, it can be manufactured relatively easily and inexpensively. In addition, since the catalyst is provided inside the branch pipe having the intermediate structure, both the specification requiring the catalyst and the specification not requiring the catalyst can be shared. In addition, since the collecting pipe rises upward at the center of the vehicle body, crosses the front end of the rear fork, extends upward, and then branches right and left, the appearance is good and the appearance is clean.

以下、図面に基づいて一実施例を説明する。図１は実施例の適用された自動２輪車の側面図、図２は排気管路の全体構成を示す図、図３は第１集合管及び第２集合管を示す平面図、図４は分岐管の側面図、図５はその正面図、図６は分岐管の触媒収納部を示す図である。 Hereinafter, an embodiment will be described with reference to the drawings. FIG. 1 is a side view of a motorcycle to which the embodiment is applied, FIG. 2 is a view showing an entire configuration of an exhaust pipe, FIG. 3 is a plan view showing a first collecting pipe and a second collecting pipe, and FIG. FIG. 5 is a side view of the branch pipe, FIG. 5 is a front view thereof, and FIG. 6 is a view showing a catalyst storage portion of the branch pipe.

まず、図１において、符号１は前輪、２はフロントフォーク、３はヘッドパイプ、４は車体フレーム、５はリヤフォーク、６は後輪、７は緩衝器、８はシート、９はライダーステップ、１０はピニオンステップ、１１は水冷４サイクル式４気筒エンジンであり、４本の排気管１２はそれぞれエンジン１１の前方から下方へ回り込んでいる。 First, in FIG. 1, reference numeral 1 is a front wheel, 2 is a front fork, 3 is a head pipe, 4 is a body frame, 5 is a rear fork, 6 is a rear wheel, 7 is a shock absorber, 8 is a seat, 9 is a rider step, Reference numeral 10 denotes a pinion step, and reference numeral 11 denotes a water-cooled four-cycle four-cylinder engine. Four exhaust pipes 12 respectively extend downward from the front of the engine 11.

図１及び図２に示すように、排気構造を構成する各部は、各排気管１２、これらを隣り合う２本づつ集合する第１集合管１３、２本の第１集合管１３をさらに１本に集合する第２集合管１４、この第２集合管１４へ接続した後左右２本に枝分れする分岐管１５、この分岐管１５の各枝分れ部へ接続するマフラー１６からなる。なお図１に示すように、マフラーの外観部全体はマフラーカバー１７で覆われ、全く別形状のマフラーであるかのような印象を与えるようになっている。 As shown in FIG. 1 and FIG. 2, each part constituting the exhaust structure includes an exhaust pipe 12, a first collecting pipe 13 for assembling two adjacent pipes, and two additional first collecting pipes 13. A second collecting pipe 14 is connected to the second collecting pipe 14, a branch pipe 15 is connected to the second collecting pipe 14 and then branches into two right and left pipes, and a muffler 16 is connected to each branch of the branch pipe 15. As shown in FIG. 1, the entire exterior of the muffler is covered with a muffler cover 17 to give the impression that the muffler has a completely different shape.

図３に示すように、４本の各排気管１２はエンジン１１の下方で略偏平に広がる。２本の第１集合管１３はエンジン１１の下方に前後方向へ略平行に配置される。図３中の符号１８は左右の集合管を結合する補強プレートであり、車体中心に沿って設けられ、その結果、排気管１２及び第１集合管１３は車体中心に沿ってほぼ左右対称に配置される。 As shown in FIG. 3, each of the four exhaust pipes 12 extends substantially flat below the engine 11. The two first collecting pipes 13 are arranged below the engine 11 so as to be substantially parallel to the front-rear direction. Reference numeral 18 in FIG. 3 denotes a reinforcing plate for connecting the left and right collecting pipes, which is provided along the center of the vehicle body. As a result, the exhaust pipe 12 and the first collecting pipe 13 are arranged substantially symmetrically along the center of the vehicle body. Is done.

各第１集合管１３のうち排気下流側となる単一パイプ部２０の周囲には吸音材等を収容した公知の消音構造部２１が設けられる。第２集合管１４のうち１本にまとまった排気下流側となる単一パイプ２２は上方へ向かって屈曲し、ほぼ車体中心上を上方へ延出して、上端の差込口２３を分岐管１５の排気上流側となる単一パイプ部２４の下端に形成されたソケット部２５へ嵌合接続する（図２）。 A well-known silencing structure 21 containing a sound absorbing material or the like is provided around the single pipe portion 20 on the exhaust downstream side of each first collecting pipe 13. A single pipe 22 on the downstream side of the exhaust of the second collecting pipe 14 is bent upward and extends substantially above the center of the vehicle body, and the insertion port 23 at the upper end is connected to the branch pipe 15. Is fitted and connected to a socket portion 25 formed at the lower end of a single pipe portion 24 on the upstream side of the exhaust (FIG. 2).

図４〜６に示すように、分岐管１５は正面視（図５）が略Ｙ字状をなし、下部の単一パイプ部２４と排気下流側となる上部の枝管２６とからなり、枝管２６は左右へ分かれて斜め上がりに後方へ延び、その先端の差込口２７をマフラー１６の前部から突出する導入管２８の先端に形成されたソケット部２９へ嵌合接続する（図２）。 As shown in FIGS. 4 to 6, the branch pipe 15 has a substantially Y-shape in a front view (FIG. 5), and includes a lower single pipe portion 24 and an upper branch pipe 26 on the exhaust downstream side. The pipe 26 is divided into right and left and extends obliquely upward and rearward, and the insertion port 27 at the tip thereof is fitted and connected to a socket 29 formed at the tip of an introduction pipe 28 projecting from the front of the muffler 16 (FIG. 2). ).

図４に示す側面視において、単一パイプ部２４は大略水平のリヤフォーク５の前端部を上下方向に交差し、枝管２６は緩衝器７と大略Ｘ字状に交差する。緩衝器７はリヤフォーク５から斜め上がりに前方へ延び、上方の車体フレーム４へ連結されている（図１参照）。 In a side view shown in FIG. 4, the single pipe portion 24 vertically crosses the front end of the substantially horizontal rear fork 5, and the branch pipe 26 substantially crosses the shock absorber 7 in an X shape. The shock absorber 7 extends obliquely upward and forward from the rear fork 5 and is connected to the upper body frame 4 (see FIG. 1).

図５において、分岐管１５の単一パイプ部２４は、リヤフォーク５の前部に左右のアーム部を連結して形成されるクロス部５ａの前方に形成された空間を上下へ通過している。枝管２６は緩衝器７の前方からその左右へ回り込んで外開き状に後方へ延びる。符号Ｃは車体中心線を示す。 In FIG. 5, a single pipe portion 24 of the branch pipe 15 vertically passes through a space formed in front of a cross portion 5a formed by connecting the left and right arms to the front of the rear fork 5. . The branch pipe 26 extends from the front of the shock absorber 7 to the left and right thereof, and extends rearward in an open manner. Symbol C indicates a vehicle center line.

図４〜６に示すように、単一パイプ部２４はプレス成形品であって、枝管２６やソケット２５の各端部を前後から一対の金属板で挟み、プレス成形で中空状に一体化させた最中合わせ構造をなす。単一パイプ部２４の内部にはハニカム状の触媒３０が収容されている。触媒３０は排気ガス浄化用の公知のもであり、最中合わせ構造に成形するとき内部へ固定されるが、さらに上部をスポット３１にて溶接されている。 As shown in FIGS. 4 to 6, the single pipe portion 24 is a press-formed product, and each end of the branch pipe 26 and the socket 25 is sandwiched between a pair of metal plates from the front and rear, and integrated into a hollow shape by press forming. It forms a matching structure during the operation. Inside the single pipe portion 24, a honeycomb-shaped catalyst 30 is accommodated. The catalyst 30 is a well-known catalyst for purifying exhaust gas. The catalyst 30 is fixed inside when being formed into an intermediate structure, and is further welded at a spot 31 at an upper portion.

次に、本実施例の作用を説明する。上記のように、単一パイプ部２４を最中合わせ構造にすると、比較的簡単かつ安価に製造でき、しかも触媒３０を不要とする仕様の場合は、触媒３０を入れずに最中合わせ構造を成形すればよく、金型等成形に必要な設備を共通にできるから、触媒を必要とする仕様と不要の仕様の双方について共用化できる。 Next, the operation of the present embodiment will be described. As described above, if the single pipe portion 24 is formed into a middle structure, it can be manufactured relatively easily and inexpensively, and in the case of a specification that does not require the catalyst 30, the middle structure can be formed without inserting the catalyst 30. Molding can be performed, and equipment necessary for molding such as a mold can be shared, so that both specifications requiring a catalyst and specifications not requiring a catalyst can be shared.

また、排気構造のうち、分岐管１５からマフラー１６に至る後部側も、平面視でほぼ車体中心に沿って左右対称となるように配置されている。したがって前端側の排気管１２から後端側となるマフラー１６までの排気構造全体が、平面視でほぼ車体中心に沿って左右対称となる。 In the exhaust structure, the rear side from the branch pipe 15 to the muffler 16 is also arranged so as to be symmetrical substantially along the center of the vehicle body in plan view. Therefore, the entire exhaust structure from the exhaust pipe 12 on the front end side to the muffler 16 on the rear end side is symmetrical substantially along the center of the vehicle body in plan view.

そのうえ、分岐管１５の単一パイプ部２４を車体中心上にて、リヤフォーク５の前部に左右のアーム部を連結して形成されるクロス部５ａの前方に形成された空間に上下方向へ配設し、枝管２６をリヤフォークの上方で左右へ外開き状に設け、それぞれの後端を左右一対で配置されたマフラー１６へ接続させたので、リヤフォーク５と緩衝器７の双方と干渉をさけながら、左右対称配置ができる。その結果、排気構造全体が車体中心に対して左右対称となり、重量配分において左右のバランスのとれた完成車を実現でき、かつ外観もすっきりしたものになる。しかも、左右のマフラー１６の容量を平均化でき、かつコンパクト化できる。 In addition, the single pipe portion 24 of the branch pipe 15 is vertically inserted into the space formed in front of the cross portion 5a formed by connecting the left and right arms to the front portion of the rear fork 5 on the center of the vehicle body. Since the branch pipe 26 is provided to open rightward and leftward above the rear fork, and the rear ends of the branch pipes 26 are connected to the mufflers 16 arranged in a pair on the left and right sides, both the rear fork 5 and the shock absorber 7 are connected. Symmetrical arrangement is possible while avoiding interference. As a result, the entire exhaust structure is left-right symmetrical with respect to the center of the vehicle body, so that a completed vehicle with a balanced left and right weight distribution can be realized, and the appearance is clean. Moreover, the capacities of the left and right mufflers 16 can be averaged and the size can be reduced.

また、４本の排気管１２を２本の第１集合管１３にまとめ、さらにこれを１本の第２集合管１４にまとめるとともに、これら排気管１２及び第１集合管１３をエンジン１１の下方に配置し、第２集合管１４をエンジン１１の後方かつ車体中心上に配置した。したがって、排気構造のうち重量の大きな部分を車体の重心部近くへ配置してマスの集中を図ることができる。
Further, the four exhaust pipes 12 are combined into two first collecting pipes 13, which are further combined into one second collecting pipe 14, and the exhaust pipes 12 and the first collecting pipe 13 are arranged below the engine 11. And the second collecting pipe 14 is disposed behind the engine 11 and above the center of the vehicle body. Therefore, the heavier part of the exhaust structure can be arranged near the center of gravity of the vehicle body to concentrate the mass.

実施例の適用された自動２輪車の側面図Side view of a motorcycle to which an embodiment is applied 排気管路の全体構成を示す図Diagram showing overall configuration of exhaust pipe 第１集合管及び第２集合管を示す平面図Plan view showing a first collecting pipe and a second collecting pipe 分岐管の側面図Side view of branch pipe 分岐管の正面図Front view of branch pipe 分岐管の触媒収納部を示す図Diagram showing catalyst storage section of branch pipe

符号の説明Explanation of reference numerals

５：リヤフォーク、１１：エンジン、１２：排気管、１３：第１集合管、
１４：第２集合管、１５：分岐管、１６：マフラー、２６：枝管 5: rear fork, 11: engine, 12: exhaust pipe, 13: first collecting pipe,
14: second collecting pipe, 15: branch pipe, 16: muffler, 26: branch pipe

Claims

多気筒エンジンから延出する複数の排気管をエンジン前方から下方へ通して集合させ、車体フレームに揺動自在に支持されたリヤフォークの左右アーム部を連結するクロス部の前方空間を通過させた自動２輪車の排気構造において、
前記自動２輪車は集合管を左右２本に分岐させる分岐管と、排気ガス浄化用の触媒とを備え、前記分岐管は前記リヤフォークの前端部を上下方向に交差するとともに内部に前記触媒を配置した最中合わせ構造とされることを特徴とする自動２輪車の排気構造。 A plurality of exhaust pipes extending from the multi-cylinder engine were passed through from the front of the engine to the bottom and assembled to pass through the front space of the cross section connecting the left and right arms of the rear fork supported swingably on the body frame. In the exhaust structure of a motorcycle,
The motorcycle includes a branch pipe that branches the collecting pipe into two right and left pipes, and a catalyst for purifying exhaust gas. The branch pipe crosses a front end of the rear fork in a vertical direction and has the catalyst therein. An exhaust structure for a motorcycle, characterized in that the structure is a mid-course structure in which is disposed.

前記分岐管はプレス成形された前後一対の金属板を最中合わせしたものであることを特徴とする請求項１に記載した自動２輪車の排気構造。 The exhaust structure of a motorcycle according to claim 1, wherein the branch pipe is formed by pressing a pair of front and rear metal plates formed by press forming.

前記分岐管はその下部の単一パイプ部と上部の左右に分かれて延びる枝管とからなることを特徴とする請求項１に記載した自動２輪車の排気構造。 2. The exhaust structure for a motorcycle according to claim 1, wherein the branch pipe comprises a single pipe part at a lower part thereof and a branch pipe extending right and left at an upper part.

前記触媒は前記分岐管の前記単一パイプ部に収容されることを特徴とする請求項３に記載した自動２輪車の排気構造。 The exhaust structure according to claim 3, wherein the catalyst is contained in the single pipe portion of the branch pipe.

前記分岐管はその下端部に集合管と接続されるソケット部が設けられていることを特徴とする請求項１に記載した自動２輪車の排気構造。 The exhaust structure for a motorcycle according to claim 1, wherein the branch pipe has a socket portion connected to a collecting pipe at a lower end thereof.