JP4478096B2 - Motorcycle exhaust system - Google Patents

Motorcycle exhaust system Download PDF

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JP4478096B2
JP4478096B2 JP2005317522A JP2005317522A JP4478096B2 JP 4478096 B2 JP4478096 B2 JP 4478096B2 JP 2005317522 A JP2005317522 A JP 2005317522A JP 2005317522 A JP2005317522 A JP 2005317522A JP 4478096 B2 JP4478096 B2 JP 4478096B2
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expansion chamber
exhaust
motorcycle
engine
connecting pipe
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JP2007118900A (en
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与志輝 木下
貞隆 岡部
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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  • Exhaust Silencers (AREA)

Description

本発明は、とりわけ横置きＶ型エンジンを搭載した自動二輪車に適用するに好適な、自動二輪車の排気装置に関するものである。   The present invention relates to an exhaust device for a motorcycle that is particularly suitable for application to a motorcycle equipped with a horizontally-placed V-type engine.

図８は従来の自動二輪車の排気装置の一例を備えた自動二輪車の側面図である。   FIG. 8 is a side view of a motorcycle provided with an example of a conventional motorcycle exhaust device.

近年、この種の自動二輪車においては、環境への配慮がますます重要視されていることを受けて、排気消音器の容量が増える傾向にある。そのため、エンジン下に配置される排気装置においても、空間効率をできるだけ高めることが要望されている。   In recent years, in this type of motorcycle, the capacity of exhaust silencers tends to increase due to the increasing importance of environmental considerations. For this reason, there is a demand for improving the space efficiency as much as possible even in the exhaust device disposed under the engine.

そこで、従来は、図８に示すように、排気装置５の空間効率を高めるべく、エンジン１９の下方に突出したオイルパン１５の前後に２つの膨張室、すなわち前方膨張室２７および後方膨張室２６を配置し、これら前方膨張室２７、後方膨張室２６を連結管２８で連結する技術（以下、公知技術１という。）が提案されていた（例えば、特許文献１参照）。
特開２００４−２６００７号公報（段落〔００１５〕の欄、図２） Therefore, conventionally, as shown in FIG. 8, in order to increase the space efficiency of the exhaust device 5, two expansion chambers, that is, a front expansion chamber 27 and a rear expansion chamber 26 are provided in front of and behind the oil pan 15 protruding below the engine 19. , And a technique for connecting the front expansion chamber 27 and the rear expansion chamber 26 with a connecting pipe 28 (hereinafter, referred to as known technique 1) has been proposed (for example, see Patent Document 1).
JP 2004-26007 A (paragraph [0015] column, FIG. 2)

しかし、この公知技術１では、次のような課題があった。   However, this known technique 1 has the following problems.

第１に、オイルパン１５の下方に連結管２８があるため、オイルパン１５の容量を増やす場合に制限を受けてしまう。   First, since the connecting pipe 28 is provided below the oil pan 15, there is a limitation when the capacity of the oil pan 15 is increased.

第２に、膨張室に触媒装置が置かれる場合があるが、この場合、空間効率を高める観点から触媒装置の配置について考慮する必要がある。   Second, a catalyst device may be placed in the expansion chamber. In this case, it is necessary to consider the arrangement of the catalyst device from the viewpoint of improving space efficiency.

本発明は、こうした課題を解決することが可能な、自動二輪車の排気装置を提供することを目的とする。   An object of the present invention is to provide an exhaust device for a motorcycle that can solve these problems.

まず、請求項１に係る自動二輪車の排気装置の発明では、エンジンの下方突出部の前後に前方膨張室および後方膨張室が配置され、これら前方膨張室および後方膨張室が連結管で互いに連結された、自動二輪車の排気装置において、前記連結管は、車体の左右いずれか片側に偏置され、前方及び後方に振り分けて前記前方膨張室と前記後方膨張室を配置し、また、空間の側方に前記連結管を配置することで、それらによって囲まれて形成された前記空間に、前記エンジンの下方突出部を下方に膨出して側面視で前記連結管に重なるように配置したことを特徴とする。
また、請求項２に係る自動二輪車の排気装置の発明では、前記後方膨張室が排気上流側で、前記前方膨張室が排気下流側であり、前記前方膨張室には、排出管が設けられていることを特徴とする。
また、請求項３に係る自動二輪車の排気装置の発明では、前記後方膨張室には、触媒装置が設けられ、前記エンジンに接続される排気管が、前記触媒装置に対向して開口するＵ字管に接続され、前記Ｕ字管と前記後方膨張室との接続部近傍で、当該Ｕ字管の外周部に、前記Ｕ字管の内側へ屈曲する屈曲部が形成されていることを特徴とする。
また、請求項４に係る自動二輪車の排気装置の発明では、前記前方膨張室は、前記エンジンの前方に配置されたラジエータの下方まで膨出していることを特徴とする。
また、請求項５に係る自動二輪車の排気装置の発明では、前記連結管は、底部が頂部より幅広く、かつ底部が中央から外方へ向かうに連れて上方に立ち上がる縦長卵形断面形状であることを特徴とする。 First, in the invention of the exhaust system for a motorcycle according to claim 1, the front expansion chamber and the rear expansion chamber are arranged before and after the downward projecting portion of the engine, and the front expansion chamber and the rear expansion chamber are connected to each other by a connecting pipe. In addition, in the exhaust system for a motorcycle, the connecting pipe is offset on either the left or right side of the vehicle body, and the front expansion chamber and the rear expansion chamber are arranged by being distributed forward and backward, and the side of the space by disposing the connecting tube, the space formed by being surrounded by them, that it has placed so as to overlap the connecting pipe as viewed from the side bulging downward projecting portion of the engine downward Features.
In the motorcycle exhaust apparatus according to claim 2, the rear expansion chamber is on the exhaust upstream side, the front expansion chamber is on the exhaust downstream side, and a discharge pipe is provided in the front expansion chamber. It is characterized by being.
In the invention of the exhaust device for a motorcycle according to claim 3, the rear expansion chamber is provided with a catalyst device, and an exhaust pipe connected to the engine opens to face the catalyst device. A bent portion that is connected to a tube and is bent toward the inside of the U-shaped tube is formed in the outer peripheral portion of the U-shaped tube in the vicinity of the connection portion between the U-shaped tube and the rear expansion chamber. To do.
Further, in the invention of the exhaust system for a motorcycle according to claim 4, the front expansion chamber bulges to a position below a radiator disposed in front of the engine .
Also, in the invention of the exhaust system of a motorcycle according to claim 5, wherein the connecting pipe is a vertical oval cross-sectional shape that rises upwardly take a wide range from the top portion bottom, and the bottom portion is directed from the center outward It is characterized by that.

本発明によれば、エンジンの下方突出部（オイルパンなど）の前後に前方膨張室および後方膨張室が配置され、これら前方膨張室および後方膨張室が連結管で互いに連結された、自動二輪車の排気装置において、前記連結管は、車体の左右いずれか片側に偏置され、前後に前記前方膨張室と前記後方膨張室を配置し、また、側方に前記連結管を配置することで形成された空間に、前記エンジンの下方突出部を下方に膨出して配置可能としたことから、エンジンの下方突出部の容量を十分確保しながら、排気装置の空間効率を一層高めることができる。   According to the present invention, a front expansion chamber and a rear expansion chamber are disposed before and after a downward projecting portion (oil pan or the like) of an engine, and the front expansion chamber and the rear expansion chamber are connected to each other by a connecting pipe. In the exhaust device, the connecting pipe is formed by being displaced on either the left or right side of the vehicle body, arranging the front expansion chamber and the rear expansion chamber on the front and rear sides, and arranging the connecting pipe on the side. Since the lower projecting portion of the engine can be swelled downward in the space, it is possible to further increase the space efficiency of the exhaust device while sufficiently securing the capacity of the lower projecting portion of the engine.

また、後方膨張室が排気上流側で、前方膨張室が排気下流側であり、前方膨張室に排出管が設けられていると、走行中のエンジンへの熱伝播が抑制される。   Further, when the rear expansion chamber is the exhaust upstream side, the front expansion chamber is the exhaust downstream side, and the exhaust pipe is provided in the front expansion chamber, heat propagation to the running engine is suppressed.

また、後方膨張室に触媒装置が設けられ、エンジンに排気管がＵ字管を介して触媒装置に対向して開口するように接続され、Ｕ字管と後方膨張室との接続部近傍で、Ｕ字管の外周部に、内側へ屈曲する屈曲部が形成されていると、Ｕ字管から後方膨張室に流れる排気が、後方膨張室内の触媒装置に均等に拡散し、浄化効率が高まる。   In addition, a catalyst device is provided in the rear expansion chamber, and an exhaust pipe is connected to the engine so as to open facing the catalyst device via the U-shaped tube, in the vicinity of the connection portion between the U-shaped tube and the rear expansion chamber, When a bent portion that is bent inward is formed on the outer peripheral portion of the U-shaped tube, the exhaust gas flowing from the U-shaped tube to the rear expansion chamber is evenly diffused to the catalyst device in the rear expansion chamber, thereby improving the purification efficiency.

また、前方膨張室がエンジンの前方に配置されたラジエータの下方まで膨出していると、ラジエータの冷却性能への影響を極力小さくしながら前方膨張室の容量を上げることができる。   Further, when the front expansion chamber bulges to the lower side of the radiator disposed in front of the engine, the capacity of the front expansion chamber can be increased while minimizing the influence on the cooling performance of the radiator.

また、エンジンの下方突出部の前後に前方膨張室および後方膨張室が配置され、これら前方膨張室および後方膨張室が連結管で互いに連結された、自動二輪車の排気装置において、後方膨張室に触媒装置が設けられていることから、触媒装置が入ることによって容量が増加することになっても、容量を比較的とりやすい前方膨張室で、消音のために使う容量をかせぐことができる。その結果、排気浄化と消音の両立を実現しやすくなる。   In addition, in a motorcycle exhaust system in which a front expansion chamber and a rear expansion chamber are disposed before and after the downward projecting portion of the engine, and the front expansion chamber and the rear expansion chamber are connected to each other by a connecting pipe, a catalyst is provided in the rear expansion chamber. Since the apparatus is provided, even if the capacity increases due to the introduction of the catalyst apparatus, the capacity used for noise reduction can be earned in the front expansion chamber which is relatively easy to take capacity. As a result, it becomes easy to achieve both exhaust purification and noise reduction.

さらに、連結管の底部が頂部より幅広く、かつ中央から外方へ向かうに連れて上方に立ち上がる縦長卵形断面形状であると、エンジンの下方突出部の容量を効率よく確保することができ、また、自動二輪車のバンク角に極力制限を与えないようにしながら、連結管の断面積を確保することができる。   Furthermore, if the bottom of the connecting pipe is wider than the top and has a vertically long oval cross-sectional shape that rises upward from the center toward the outside, the capacity of the downward projecting portion of the engine can be efficiently secured, and In addition, the cross-sectional area of the connecting pipe can be secured while preventing the bank angle of the motorcycle from being limited as much as possible.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

＜第１の実施形態＞
図１は本発明に係る自動二輪車の排気装置の第１の実施形態を備えた自動二輪車の側面図、図２は図１に示す自動二輪車のエンジン回りを示す側面図、図３は本発明に係る自動二輪車の排気装置の第１の実施形態を示す側面図、図４は本発明に係る自動二輪車の排気装置の第１の実施形態を示す平面図、図５は図４に示す自動二輪車の排気装置のＶ−Ｖ線による断面図である。 <First Embodiment>
FIG. 1 is a side view of a motorcycle provided with a first embodiment of a motorcycle exhaust system according to the present invention, FIG. 2 is a side view showing an engine periphery of the motorcycle shown in FIG. 1, and FIG. FIG. 4 is a plan view showing a first embodiment of a motorcycle exhaust apparatus according to the present invention, and FIG. 5 is a plan view of the motorcycle shown in FIG. It is sectional drawing by the VV line of an exhaust apparatus.

自動二輪車１は、図１に示すように、ヘッドパイプ４から後方斜め下方に延伸する左右一対のメインフレーム２を有しており、ヘッドパイプ４にはフロントフォーク３が旋回自在に連結されている。フロントフォーク３の上端部には、ハンドル１６が取り付けられている。一方、フロントフォーク３の下端部には前輪６が回転自在に支持されており、前輪６の上方にはフロントフェンダ８がフロントフォーク３に支持された形で付設されている。さらに、前輪６の左側には円環状のフロントブレーキディスク１０が固着されており、フロントブレーキディスク１０にはフロントブレーキキャリパ１１がフロントフォーク３に支持された形で添設されている。   As shown in FIG. 1, the motorcycle 1 includes a pair of left and right main frames 2 extending obliquely downward and rearward from the head pipe 4, and a front fork 3 is pivotally connected to the head pipe 4. . A handle 16 is attached to the upper end of the front fork 3. On the other hand, a front wheel 6 is rotatably supported at a lower end portion of the front fork 3, and a front fender 8 is attached above the front wheel 6 in a form supported by the front fork 3. Further, an annular front brake disc 10 is fixed to the left side of the front wheel 6, and a front brake caliper 11 is attached to the front brake disc 10 so as to be supported by the front fork 3.

また、メインフレーム２には、図１に示すように、カウル７が車体前部を覆うように装着されており、カウル７には、ヘッドライト１２、左右一対のバックミラー１３が取り付けられている。さらに、メインフレーム２には燃料タンク２１が載置されており、燃料タンク２１の後方にはシート２２が着脱自在に装着されている。   Further, as shown in FIG. 1, a cowl 7 is attached to the main frame 2 so as to cover the front of the vehicle body, and a headlight 12 and a pair of left and right rearview mirrors 13 are attached to the cowl 7. . Further, a fuel tank 21 is placed on the main frame 2, and a seat 22 is detachably attached to the rear of the fuel tank 21.

また、メインフレーム２の下側後部には、図１に示すように、スイングアーム（リアフォーク）２３が揺動自在に支持されており、スイングアーム２３の後端部には後輪２５が回転自在に支持されている。なお、メインフレーム２とスイングアーム２３との間にはリアクッション４０が架け渡されている。   Further, as shown in FIG. 1, a swing arm (rear fork) 23 is swingably supported at the lower rear portion of the main frame 2, and a rear wheel 25 rotates at the rear end portion of the swing arm 23. It is supported freely. A rear cushion 40 is bridged between the main frame 2 and the swing arm 23.

また、メインフレーム２の上側後部には、図１に示すように、リアフェンダ３２が後輪２５の上方に位置して取り付けられており、リアフェンダ４２にはストップランプ３３が取り付けられている。   Further, as shown in FIG. 1, a rear fender 32 is attached to the upper rear portion of the main frame 2 so as to be positioned above the rear wheel 25, and a stop lamp 33 is attached to the rear fender 42.

ところで、メインフレーム２の中央部には、図１に示すように、前方２気筒のシリンダー１７と後方２気筒のシリンダー１８とがＶ型に交差した横置きＶ型４気筒のエンジン１９が搭載されている。エンジン１９の前方には、図２に示すように、ラジエータ２０が設置されている。エンジン１９の下方には、オイルパン１５が下向きに突出している。そして、オイルパン１５の近傍には排気装置５が配設されており、排気装置５は、排気管３４、３５、Ｕ字管３６、Ｃ字管３７、後方膨張室２６、連結管２８、前方膨張室２７、排出管（テールパイプ）３１などから構成されている。   By the way, as shown in FIG. 1, a horizontal V-type 4-cylinder engine 19 in which a front two-cylinder cylinder 17 and a rear two-cylinder cylinder 18 intersect each other in a V-type is mounted at the center of the main frame 2. ing. As shown in FIG. 2, a radiator 20 is installed in front of the engine 19. Below the engine 19, an oil pan 15 projects downward. An exhaust device 5 is disposed in the vicinity of the oil pan 15. The exhaust device 5 includes exhaust pipes 34 and 35, a U-shaped pipe 36, a C-shaped pipe 37, a rear expansion chamber 26, a connecting pipe 28, and a front side. An expansion chamber 27, a discharge pipe (tail pipe) 31, and the like are included.

すなわち、オイルパン１５の後方には、図３および図４に示すように、後方膨張室２６が配置されているとともに、オイルパン１５の前方には前方膨張室２７が配置されている。これら後方膨張室２６、前方膨張室２７間には、連結管２８が車体の右側に偏置される形で接続されており、オイルパン１５は、前方膨張室２７と後方膨張室２６と連結管２８とで包囲されて形成された空間に位置している。ここで、前後に前方膨張室２７と後方膨張室２６を配置し、また、側方に連結管２８を配置することで形成された空間に、オイルパン１５が下方に膨出されている。なお、連結管２８は、図５に示すように、底部２８ａが頂部２８ｂより幅広く、かつ底部２８ａが中央から外方へ向かうに連れて上方に立ち上がる縦長卵形断面形状となっている。   That is, as shown in FIGS. 3 and 4, a rear expansion chamber 26 is disposed behind the oil pan 15, and a front expansion chamber 27 is disposed in front of the oil pan 15. A connecting pipe 28 is connected between the rear expansion chamber 26 and the front expansion chamber 27 so as to be offset from the right side of the vehicle body. The oil pan 15 is connected to the front expansion chamber 27, the rear expansion chamber 26, and the connection pipe. 28 is located in a space formed by being surrounded by. Here, the oil pan 15 is swelled downward in a space formed by arranging the front expansion chamber 27 and the rear expansion chamber 26 in the front and rear directions and the connecting pipe 28 on the side. As shown in FIG. 5, the connecting pipe 28 has a vertically long oval cross-sectional shape in which the bottom portion 28a is wider than the top portion 28b and the bottom portion 28a rises upward from the center toward the outside.

ここで、後方膨張室２６には、図３および図４に示すように、触媒装置３８が配置されている。また、前方膨張室２７は第１室２９および第２室３０から構成されており、これら第１室２９、第２室３０は連通筒２４を介して互いに連通している。そして、第１室２９には連結管２８が連通しており、第２室３０には、図４に示すように、排出管３１が車体後方に向けて接続されている。なお、第２室３０は、図２に示すように、ラジエータ２０の下方まで膨出しており、第２室３０の上面には、ラジエータ２０の下端部に合わせた傾斜部３０ａが形成されている。   Here, as shown in FIGS. 3 and 4, a catalyst device 38 is arranged in the rear expansion chamber 26. The front expansion chamber 27 is composed of a first chamber 29 and a second chamber 30, and the first chamber 29 and the second chamber 30 communicate with each other via a communication cylinder 24. A connecting pipe 28 communicates with the first chamber 29, and a discharge pipe 31 is connected to the second chamber 30 toward the rear of the vehicle body as shown in FIG. As shown in FIG. 2, the second chamber 30 swells to the lower side of the radiator 20, and an inclined portion 30 a that matches the lower end portion of the radiator 20 is formed on the upper surface of the second chamber 30. .

また、前方２気筒のシリンダー１７のシリンダーヘッドには、図２に示すように、それぞれ排気管３４が下向きに取り付けられており、これらの排気管３４は、エンジン１９の下方で合流してＵ字管３６を介して後方膨張室２６に連結されている。なお、図４に示すように、Ｕ字管３６と後方膨張室２６との接続部近傍で、Ｕ字管３６の外周部に、内側へ屈曲する屈曲部３９が形成されている。一方、後方２気筒のシリンダー１８のシリンダーヘッドには、図２に示すように、それぞれ排気管３５が下向きに取り付けられており、これらの排気管３５は、エンジン１９の後方で合流してＣ字管３７を介して後方膨張室２６に連結されている。したがって、後方膨張室２６が排気上流側で、前方膨張室２７が排気下流側となる。   Further, as shown in FIG. 2, exhaust pipes 34 are respectively attached downward to the cylinder heads of the cylinders 17 of the front two cylinders, and these exhaust pipes 34 merge below the engine 19 to form a U-shape. The pipe 36 is connected to the rear expansion chamber 26. As shown in FIG. 4, a bent portion 39 that is bent inward is formed in the outer peripheral portion of the U-shaped tube 36 in the vicinity of the connection portion between the U-shaped tube 36 and the rear expansion chamber 26. On the other hand, as shown in FIG. 2, exhaust pipes 35 are respectively attached downward to the cylinder heads of the cylinders 18 of the rear two cylinders, and these exhaust pipes 35 are joined at the rear of the engine 19 to form a C-shape. It is connected to the rear expansion chamber 26 via a pipe 37. Therefore, the rear expansion chamber 26 is on the exhaust upstream side, and the front expansion chamber 27 is on the exhaust downstream side.

このような構成を有する自動二輪車１においては、連結管２８がオイルパン１５の側方に位置しているため、排気装置５の空間効率を一層高めることができる。   In the motorcycle 1 having such a configuration, since the connecting pipe 28 is located on the side of the oil pan 15, the space efficiency of the exhaust device 5 can be further increased.

また、後方膨張室２６は、比較的高温な排気上流側であるが、この後方膨張室２６はエンジン１９の後方に配置されているので、走行中のエンジン１９への熱伝播が抑制される。   The rear expansion chamber 26 is located on the upstream side of the exhaust gas at a relatively high temperature. However, since the rear expansion chamber 26 is disposed behind the engine 19, heat propagation to the running engine 19 is suppressed.

また、触媒装置３８は後方膨張室２６に配置されているので、触媒装置３８が入ることによって容量が増加することになっても、容量を比較的とりやすい前方膨張室で、消音のために使う容量をかせぐことができる。その結果、排気浄化と消音の両立を実現しやすくなる。しかも、Ｕ字管３６と後方膨張室２６との接続部近傍で、Ｕ字管３６の外周部には、内側へ屈曲する屈曲部３９が形成されているので、Ｕ字管３６から後方膨張室２６に流れる排気が、後方膨張室２６内の触媒装置３８に均等に拡散し、浄化効率が高まる。さらに、触媒装置３８はエンジン１９の後方に配置されることになるので、エンジン１９の前方に配置される場合と比べて、走行中、触媒装置３８で発生した熱はエンジン１９に伝わりにくい。   Further, since the catalyst device 38 is disposed in the rear expansion chamber 26, even if the capacity increases due to the entry of the catalyst device 38, the catalyst device 38 is used for noise reduction in the front expansion chamber that is relatively easy to take up the capacity. You can earn capacity. As a result, it becomes easy to achieve both exhaust purification and noise reduction. In addition, a bent portion 39 that is bent inward is formed in the outer peripheral portion of the U-shaped tube 36 in the vicinity of the connection portion between the U-shaped tube 36 and the rear expanded chamber 26. Exhaust gas flowing to 26 is evenly diffused to the catalyst device 38 in the rear expansion chamber 26, and purification efficiency is increased. Furthermore, since the catalyst device 38 is disposed behind the engine 19, heat generated in the catalyst device 38 during traveling is less likely to be transmitted to the engine 19 as compared with the case where the catalyst device 38 is disposed in front of the engine 19.

一方、前方膨張室２７は、比較的低温な排気下流側であり、この前方膨張室２７がラジエータ２０の下方まで膨出しているため、ラジエータ２０の冷却性能への影響を極力小さくしながら前方膨張室２７の容量を上げることができる。しかも、前方膨張室２７は、その上面がラジエータ２０の下端部に合わせて傾斜しているので、ラジエータ２０と均等に離間させて前方膨張室２７の容量を効率よく上げることができる。   On the other hand, the front expansion chamber 27 is a relatively low-temperature exhaust downstream side, and since the front expansion chamber 27 swells to the lower side of the radiator 20, the front expansion chamber 27 is expanded forward while minimizing the influence on the cooling performance of the radiator 20. The capacity of the chamber 27 can be increased. Moreover, since the upper surface of the front expansion chamber 27 is inclined in accordance with the lower end portion of the radiator 20, the capacity of the front expansion chamber 27 can be increased efficiently by being spaced apart from the radiator 20 evenly.

また、後方膨張室２６と前方膨張室２７とを連結する連結管２８は、底部２８ａが頂部２８ｂより幅広く、かつ底部２８ａが中央から外方へ向かうに連れて上方に立ち上がる縦長卵形断面形状となっているので、オイルパン１５の容量を効率よく確保することができ、また、自動二輪車１のバンク角に極力制限を与えないようにしながら、連結管２８の断面積を確保することができる。   The connecting pipe 28 that connects the rear expansion chamber 26 and the front expansion chamber 27 has a vertically long oval cross-sectional shape in which the bottom portion 28a is wider than the top portion 28b and the bottom portion 28a rises upward from the center toward the outside. Therefore, the capacity of the oil pan 15 can be efficiently secured, and the cross-sectional area of the connecting pipe 28 can be secured while preventing the bank angle of the motorcycle 1 from being limited as much as possible.

＜第２の実施形態＞
図６は本発明に係る自動二輪車の排気装置の第２の実施形態を備えた自動二輪車のエンジン回りを示す側面図、図７は本発明に係る自動二輪車の排気装置の第２の実施形態を示す平面図である。 <Second Embodiment>
FIG. 6 is a side view showing the periphery of an engine of a motorcycle equipped with a second embodiment of the exhaust system for a motorcycle according to the present invention, and FIG. 7 shows a second embodiment of the exhaust system for a motorcycle according to the present invention. FIG.

上述した第１の実施形態においては、横置きＶ型４気筒のエンジン１９が搭載された自動二輪車１について説明したが、図６および図７に示すように、前方３気筒のシリンダー１７と後方２気筒のシリンダー１８とがＶ型に交差した横置きＶ型５気筒のエンジン１９を搭載した自動二輪車１に本発明を同様に適用することもできる。この場合、図６に示すように、前方３気筒のシリンダー１７に３本の排気管３４が取り付けられている点と、図７に示すように、これらの排気管３４を後方膨張室２６に連結するＵ字管３６が排気量に合わせて大径化している点とを除き、第１の実施形態と同じ構成を有するので、上述した作用効果を奏する。   In the first embodiment described above, the motorcycle 1 on which the horizontally-placed V-type four-cylinder engine 19 is mounted has been described. However, as shown in FIGS. The present invention can also be similarly applied to the motorcycle 1 equipped with a horizontally mounted V-type 5-cylinder engine 19 in which the cylinder 18 intersects the V-type. In this case, as shown in FIG. 6, three exhaust pipes 34 are attached to the cylinder 17 of the front three cylinders, and these exhaust pipes 34 are connected to the rear expansion chamber 26 as shown in FIG. Since the U-shaped tube 36 has the same configuration as that of the first embodiment except that the diameter of the U-shaped tube 36 is increased in accordance with the displacement, the above-described effects can be obtained.

＜その他の実施形態＞
上述の実施形態においては、横置きＶ型のエンジン１９が搭載された自動二輪車１について説明したが、横置きＶ型以外の形式（例えば、縦置きＶ型、並列多気筒など）のエンジン１９を搭載した自動二輪車１に本発明を同様に適用することもできる。 <Other embodiments>
In the above-described embodiment, the motorcycle 1 on which the horizontal V-type engine 19 is mounted has been described. However, the engine 19 of a type other than the horizontal V-type (for example, vertical V-type, parallel multi-cylinder, etc.) is used. The present invention can be similarly applied to the mounted motorcycle 1.

上述の実施形態においては、図４に示すように、オイルパン１５の前後に配置された前方膨張室２７と後方膨張室２６とを接続する連結管２８が車体の右側に偏置される場合について説明したが、連結管２８を車体の左側に偏置してもよい。要するに、連結管２８が車体の左右いずれか片側に偏置されていれば、上述した作用効果を奏するのである。   In the above-described embodiment, as shown in FIG. 4, a case where the connecting pipe 28 connecting the front expansion chamber 27 and the rear expansion chamber 26 disposed before and after the oil pan 15 is offset to the right side of the vehicle body. Although described, the connecting pipe 28 may be offset from the left side of the vehicle body. In short, if the connecting pipe 28 is offset on either the left or right side of the vehicle body, the above-described effects can be obtained.

上述の実施形態においては、オイルパン５がエンジン１９の下方に突出している自動二輪車１について説明したが、この下方突出部はオイルパン５に限るわけではない。例えば、ポンプ等の補機のケース部がエンジン１９の下方に突出している場合に本発明を同様に適用することも可能である。   In the above-described embodiment, the motorcycle 1 in which the oil pan 5 protrudes downward from the engine 19 has been described. However, the downward protrusion is not limited to the oil pan 5. For example, the present invention can be similarly applied when a case portion of an auxiliary machine such as a pump projects below the engine 19.

本発明は、横置きＶ型エンジンを始めとする各種形式のエンジンが搭載された自動二輪車に広く適用することができる。   The present invention can be widely applied to motorcycles equipped with various types of engines such as a horizontal V-type engine.

本発明に係る自動二輪車の排気装置の第１の実施形態を備えた自動二輪車の側面図である。1 is a side view of a motorcycle provided with a first embodiment of a motorcycle exhaust device according to the present invention. 図１に示す自動二輪車のエンジン回りを示す側面図である。FIG. 2 is a side view showing an engine periphery of the motorcycle shown in FIG. 1. 本発明に係る自動二輪車の排気装置の第１の実施形態を示す側面図である。1 is a side view showing a first embodiment of an exhaust device for a motorcycle according to the present invention. 本発明に係る自動二輪車の排気装置の第１の実施形態を示す平面図である。1 is a plan view showing a first embodiment of an exhaust device for a motorcycle according to the present invention. 図４に示す自動二輪車の排気装置のＶ−Ｖ線による断面図である。Fig. 5 is a cross-sectional view taken along line VV of the exhaust device for the motorcycle shown in Fig. 4. 本発明に係る自動二輪車の排気装置の第２の実施形態を備えた自動二輪車のエンジン回りを示す側面図である。FIG. 6 is a side view showing an engine periphery of a motorcycle including a second embodiment of the motorcycle exhaust device according to the present invention. 本発明に係る自動二輪車の排気装置の第２の実施形態を示す平面図である。FIG. 3 is a plan view showing a second embodiment of the exhaust device for a motorcycle according to the present invention. 従来の自動二輪車の排気装置の一例を備えた自動二輪車の側面図である。FIG. 6 is a side view of a motorcycle including an example of a conventional motorcycle exhaust device.

符号の説明Explanation of symbols

１……自動二輪車
２……メインフレーム
５……排気装置
１５……オイルパン（下方突出部）
１９……エンジン
２０……ラジエータ
２６……後方膨張室
２７……前方膨張室
２８……連結管
３１……排出管
３４、３５……排気管
３６……Ｕ字管
３８……触媒装置
３９……屈曲部 1 …… Motorcycle 2 …… Main frame 5 …… Exhaust device 15 …… Oil pan (downward protruding part)
19 …… Engine 20 …… Radiator 26 …… Back expansion chamber 27 …… Front expansion chamber 28 …… Connecting pipe 31 …… Discharge pipe 34, 35 …… Exhaust pipe 36 …… U-shaped pipe 38 …… Catalyst device 39 ... ... Bent part

Claims (5)

エンジンの下方突出部の前後に前方膨張室および後方膨張室が配置され、これら前方膨張室および後方膨張室が連結管で互いに連結された、自動二輪車の排気装置において、
前記連結管は、車体の左右いずれか片側に偏置され、
前方及び後方に振り分けて前記前方膨張室と前記後方膨張室を配置し、また、空間の側方に前記連結管を配置することで、それらによって囲まれて形成された前記空間に、前記エンジンの下方突出部を下方に膨出して側面視で前記連結管に重なるように配置したことを特徴とする、自動二輪車の排気装置。 In the exhaust device for a motorcycle, the front expansion chamber and the rear expansion chamber are arranged before and after the downward projecting portion of the engine, and the front expansion chamber and the rear expansion chamber are connected to each other by a connecting pipe.
The connecting pipe is offset to either the left or right side of the vehicle body,
Distributes the front and rear placing the rear expansion chamber and the front expansion chamber, also, by arranging the connecting pipe on the side of the space, the space formed by being surrounded by them, of the engine characterized by being placed so as to overlap the connecting pipe in a side view bulged downward projecting portion downward, motorcycle exhaust system. 前記後方膨張室が排気上流側で、前記前方膨張室が排気下流側であり、
前記前方膨張室には、排出管が設けられていることを特徴とする、請求項１に記載の自動二輪車の排気装置。 The rear expansion chamber is on the exhaust upstream side, and the front expansion chamber is on the exhaust downstream side,
The exhaust device for a motorcycle according to claim 1, wherein a discharge pipe is provided in the front expansion chamber. 前記後方膨張室には、触媒装置が設けられ、
前記エンジンに接続される排気管が、前記触媒装置に対向して開口するＵ字管に接続され、
前記Ｕ字管と前記後方膨張室との接続部近傍で、当該Ｕ字管の外周部に、前記Ｕ字管の内側へ屈曲する屈曲部が形成されていることを特徴とする、請求項２に記載の自動二輪車の排気装置。 The rear expansion chamber is provided with a catalyst device,
An exhaust pipe connected to the engine is connected to a U-shaped pipe opening facing the catalyst device;
3. A bent portion that bends inward of the U-shaped tube is formed in an outer peripheral portion of the U-shaped tube in the vicinity of a connection portion between the U-shaped tube and the rear expansion chamber. The exhaust system for a motorcycle according to claim 1. 前記前方膨張室は、前記エンジンの前方に配置されたラジエータの下方まで膨出していることを特徴とする、請求項２に記載の自動二輪車の排気装置。   The exhaust device for a motorcycle according to claim 2, wherein the front expansion chamber bulges to a lower side of a radiator disposed in front of the engine. 前記連結管は、底部が頂部より幅広く、かつ底部が中央から外方へ向かうに連れて上方に立ち上がる縦長卵形断面形状であることを特徴とする、請求項１乃至４のいずれかに記載の自動二輪車の排気装置。 The connecting pipe is characterized in that the bottom is elongated oval cross-sectional shape that rises upwardly take a wide range from the top, and bottom direction from the center outward, according to any one of claims 1 to 4 Motorcycle exhaust system.
JP2005317522A 2005-10-31 2005-10-31 Motorcycle exhaust system Expired - Fee Related JP4478096B2 (en)

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