1354057 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種排氣系統及一種包含該排氡系統之跨 坐型車輛’其中該排氣系統包含一被連接至一從—引擎延 伸之排氣管的膨脹室及一被連接至該膨脹室的消音器。 【先前技術】 習知上，對於諸如機車的跨坐型車輛來說，作為在該等 車輛中每一者具有廣泛使用之構造，一膨脹室即一所謂 的排氣室被設置於一引擎及一消音器的中間（例如見專利 文獻1)。經由一連接至該引擎之排氣管排出的廢氣在該排 氣室中膨脹。 因為設置該排氣室，故排氣噪音可被減弱。此外，由於 該排氣室被設置於該引擎及該消音器之間，故該消音器之 尺寸可被減小。更具體而言，該排氣系統之該總長度可因 如此設置之該排氣室而減少。 諸如一從該弓丨擎延伸之排氣管之一部分及一用於淨化廢 氣的催化器之組件被配置於該排氣室中。 [專利文獻1]曰本未審查專利公開案第10_238332號（第4 頁，圖1) 【發明内容】 [本發明欲解決之問題] 然而，因上述該習知排氣系統而產生下文中所描述的問 題°在一包含一膨脹室（排氣室）之排氣系統被設置於一小 型跨坐型車輛（引擎排氣量為200 cc或更小）中的情況下， 135981.doc 會產生不能獲得該排氣系統之一足夠的總長度的問題，且 因此很難穩定地改善該排氣系統之性能，更詳細而言係減 少排氣噪音及改善引擎動力。 本發明鑒於上述該等情況而被做出，且本發明之一目的 係^供一種排氣系統及一種包含該排氣系統的跨坐型車 輛，其中該排氣系統能在包含一被連接至一從一引擎延伸 之排氣管的膨脹室之情況下防止該車輛之尺寸增大同時 能維持一被要求之性能。 [解決問題之手段] 為解決上述該等問題，本發明具有一描述於下的特徵。 根據本發明之該特徵，—排氣系統包含—被連接至一產生 一跨坐型車輛之一驅動力之引擎的排氣管；一與該排氣管 連通並使從該引擎排出之廢氣膨脹的膨脹室；一與該膨脹 至連通之消音器；及一與該膨脹室連通的再循環管。該再 循：管包含一第一管部及一第二管部，該第一管部從該膨 脹至延伸至該膨脹室之外側，而該第二管部與該第一管部 及該膨脹室連通；且該膨m室包含—允許該第 排氣管在簡Μ巾彼此連通的錢部。 ^ [本發明之效果] 根據本發明之該特徵，可提供-種排氣系統及一種包含 該排氣系統的跨坐刑击私 3 ^2'車輛’其中該排氣系統能抑制該跨坐 型皁輛之尺计掷4> „ S大’同時維持一被要求之性能。 【實施方式】 本.發明之一 被描述於下。 跨坐型車輛的一個實施例將參考該等圖式而 J& 貝 ，、體而言，描述係關於（1)跨坐型車輛之總 135981.doc 體配置、（2)#备$ μ 實施例。…之配置、(3)效果及優點以及(4)其他 在該等圖式中， 分H ，相同或類似之數字指示相同或類似之部 。等圖式為概要圖式，因此應理解例如各自的 尺寸比率與真實的尺寸比率係不同的。 缺，在兮Γ如實際尺寸應參考如下之描述而被確定。當 :在該4圖式中包含例如彼此的尺寸關係及比率不同的 口 分0 (1)跨坐型車輛之總體配置 圖1為一作為本發明之該跨坐型車輕之_實施例的機車 的左側視圖。圖2為處於一包含例如一車體蓋（未顯示）之 組件被移除之狀態中的該機車1〇之右側視圖。 參考圖1及圖2,該機車10包含一前輪20及-後輪90。該 機車1 0藉由使用一被—HI Λζ\ ^ . 90。 被引擎40產生的驅動力驅動該後輪 該引擎40為-單缸四衝程型式。同時，該引擎4〇為一空 氣冷卻、-低排氣量型式。該弓,擎4〇被安裝至一形成該機 車10之一結構的車體框架30。 此外，一排氣系統100被連接至該引擎4〇。更具體而 言，一排氣管110被連接至該5丨擎4〇之—汽缸頭4〇a。 該排氣系統1〇〇包含該排氣管110、一排氣室i2〇及一消 音器〗90«該排氣室12〇與該排氣管11〇連通。該消音器19〇 藉由一連接管部180(在圖1及圖2中去Ss_ arel 禾顯不，見圖3)與該排 氣室12〇連通。更具體而言，該排氣室12()被設置於該引擎 13598 丨.doc 1354057 40及該消音器190之間。 在該排氣室120中，藉由排氣管11〇從該引擎4〇排出之廢 波被促使膨脹。該排氣室12〇具有一箱形形狀。根據本實 施例，該排氣室120配置一膨脹室。 該消音器190位於該排氣系統1〇〇之一後端部中。更具體 而言，該消音器190被配置於該後輪9〇之右邊。廢氣從一 排氣出口 19〇a排出。 該排氣室120及該消音器19〇減小由該引擎4〇產生的排氣 嗓音。在本實施例中，因為該排氣室120被提供，所以相 對於該排氣室120未被提供之情況，該消音器19〇之尺寸被 減小。更具體而言，相對於該排氣室i 2〇未被提供之情 況，該排氣系統100之該總長度被減少。 (2)排氣系統之配置 該排氣系統1 00之配置將被描述於下。更具體而言，該 排氣系統100之總體配置、該排氣室12〇(膨脹室）之配置及 一與該排氣室120連通之再循環管的配置將被描述於下。 (2.1)總體配置 圖3為該排氣系統1 〇〇之一總體透視圖。參考圖3，該排 氣系統1 00包含該排氣管11 〇、該排氣室12〇、一再循環管 130、該連接管部180及該消音器190。 該排氣管110藉由彎曲一截面為圓形之管子而形成。一 用於連接至該汽缸頭40a的連接部111被提供至該排氣管 110。 該排氣室120與該排氣管110連通。一安裝部123被提供 135981.doc -10· 1354057 於該排氣室120之一橫向邊緣部i2〇Lb中。此外，一安裝部 U4被提供至該排氣室ι2〇之一前邊緣部12〇a之該右端。該 排氣室120藉由使用該等安裝部i 23及124而安裝至該車體 框架30。 該再循環管130與該排氣室120之該前邊緣部120a連通。 該再循環管130被用於將從該排氣室120排出的廢氣再循環 至該排氣室120。 該連接管部180與該排氣室120之一橫向邊緣部i20Rb連 通°該消音器190與該連接管部180連通》更具體而言，該 消音器190藉由該連接管部180與該郝氣室12〇連通。 該排氣出口 190a被形成於該消音器190中，在其中該排 氣出口 190a排出已流經該排氣管11〇、該排氣室12〇、該再 循環管130及該連接管部18〇的廢氣。該消音器190具有一 圓柱形形狀並沿著該機車10之該前-後方向配置。一保護 器191被提供於該消音器190外側。 (2.2)膨脹室之配置 圖4為配置本實施例之該膨脹室的該排氣室12〇及該再循 環管130之一透視圖。除其他部件之外，該排氣室12〇之一 内部構造被顯示於圖4中。 如圖4所示，一用於淨化從該引擎40排出之廢氣（見圖i 及圖2)的催化器121被配置於該箱狀排氣室丨2〇中。該催化 器121被連接至該排氣管11〇。已流經該排氣管n〇之内部 的該等廢氣被該催化器121引導。 一連通部122與該催化器121連通。該連通部122進一步 135981.doc 1354057 與該再循環管130連通，更具體而言，與一第一管部131連 通。 一開口 122 a被形成於該連通部122中。更具體而古，該 開口 122a被緊接形成於該催化器121之後方。在本實施例 中，該開口 122a被形成於該連通部122之一上表面上β此 外 與該開口 122a相同的開口（未顯示）被形成於該連通 部122之一下表面上與該開口 122a相對。即兩個開口被形 成於該連通部122中》 一網狀部125被提供於該排氣室12〇之一内底壁中。在本 實施例中，一被形成為網狀的鋼板被附接至該排氣室12〇 之一内底壁。 (2·3)再循環管之配置 如圖4所示’該再循環管13〇包含該第一管部Hi、一第 二管部13 2及一回流管部13 3。 該第一管部131從該排氣室12〇延伸至該排氣室12〇之外 側。該第一管部131沿著該機車1〇之該向前方向（在圖式中 的F方向）從該排氣室12〇延伸。 該第二管部132藉由該回流管部133與該第一管部131及 該排氣室^。連通。該第二管部132從該機車1〇之該前側與 該排氣室120連通。在本實施例中，該排氣管11〇被配置大 體平行於該第一管部131及該第二管部132。更具體而言， 該排氣管UO亦從該機車10之該前側與該排氣管⑽連通。 該回流管部133將該第一管部131連接至該第二管部 132。因此，已流經該第一管部131的廢氣藉由該回流管部 135981.doc -12- 1354057 133導向該第二管部132 β 該第二管部U2包含一突出進入該第二管部ΐ32中的 :二:從該連通部122排出至該再循環管13。中的該等廢 虱從《•亥大出部141排出至該排氣室12〇中。更具體而， 該突出部Ml排出的該等廢氣在該排氣室12〇中膨服。。從 多個排氣孔Mla圍繞該突出部141之—外周部而形成。 該等排氣孔14U都為圓形，並圍繞該突出部i4i之一外周 部而形成。該等廢氣經由該等排氣孔141&而被排放至該排 氣室120。 Λ 在本實施例中，該突出部141之一前邊緣部被封閉。更 具體而言，一罩子142被安裝至該突出部141之一前端部。 圖5為該排氣室120及該再循環管13〇之一平面圖。如圖5 所示，從該引擎40排出（見圖i及圖2)的該等廢氣從該排氣 管no經由配置於該排氣室120中的該催化器121及該連通 部122而導向該再循環管13〇中。被導入該再循環管13〇中 之該等廢氣從配置於該排氣室120中的該突出部丨41排放至 該排氣室120中。排放至該排氣室120中並在其中膨脹的該 等廢氣經由該連接管部180導向該消音器19〇。 一由該回流管部133形成的排氣通道P係圓弧形的。該排 氣通道P之一曲率半徑（曲率半徑R)大於在該第一管部131 之一外端131a及該第二管部132之一與該外端i31a相對之 外端132a之間的該距離（寬度w)之一平分值。 根據本實施例’為了更容易地製造具有該曲率半徑R的 該回流管部133，包含上及下部（未顯示）的兩件式構造被用 135981.doc -13- 1354057 於該回流管部133。更具體而言，該回流管部in並非藉由 . 一管材之彎曲處理而形成’而係藉由焊接該等上及下部而 形成。 此外，該回流管部133沿該曲率半徑r之該方向配置於一 • 平面上。更具體而言’在該排氣系統100之該平面圖中觀 察，該回流管部133被配置於一由該排氣室12〇之兩個端部 或更具體而言’一由從該等橫向邊緣部12〇Lb&12〇Rb朝該 _ 機車10之該前側延伸的延長線LI、L2形成的區域A1中》 在該實施例中，該連通部122之一内徑φ3大於該排氣管 110之一内徑φΐ。此外’該連接管部18〇之一内徑〆大於該 連通部122之該内徑φ3。即滿足φ1(内徑）< 内徑）< Φ4(内徑）之該關係。 此外，在本實施例中，該連通部122之該内徑…小於該 催化益121之一内徑φ2。 (3)效果及優點 • 本實施例之一排氣系統（排氣系統100)包含一連接至一 產生跨坐型車輛（機車10)之驅動力之引擎（引擎40)的排 氣e(排氣管11〇); 一與該排氣管連通並使從該引擎排出之 廢氣路脹的膨脹室（排氣室12〇);及一與該膨脹室連通的消 .曰器（消g器190)。該排氣系統1 〇〇包含一與該膨脹室連通 的再循環管（再循環管13〇)。該再循環管包含一從該膨服室 該膨服室之外側的第_管部（第—管部131)及與該第 吕P及該蟛脹室連通的第二管部（第二管部132)。該膨脹 室包含允許該第-管部及該排氣管在該膨脹室中彼此連通 135981.doc • 14· 的該連通部（連通部122)。 根據該排氣系統100，用於將廢氣再循環至該排氣室120 内的該再循環管130被提供於該排氣室12〇外側。因此，具 有一必要長度的該排氣通道P可被輕易獲得。此外，該再 揭環管130被配置於該排氣室120之外部。因此，與一具有 與該再循環管130之長度相同之長度的排氣管被配置於 該排氣室120中的情況相比’該排氣室12〇之一實質體積容 量被增大。因此，降低排氣噪音之性能可被改進。 更具體而言，根據該排氣系統100，該機車1〇之尺寸的 增大可被抑制，同時被要求之性能亦可獲得。舉例來說， 假設一與一習知排氣系統相似的排氣系統被設置於一包含 —具有150 CC之排氣量之引擎40的小型機車10中。在這種 情況下，由於不能提供一具有足夠體積容量的排氣室，因 此排氣噪音降低效果被限制。此外’由於不能獲得該排氣 通道P之一足夠的總長度，因此該引擎動力，特別是該低 速扭矩被減小》 此外，一重的排氣室120被配置在該機車1〇之前後方向 上之一中心部分且在該機車1〇之一最低位置中。因此該 機車10之重心被降低，且行駛穩定性、操作性及類似可被 改進。 此外，該排氣系統100之特徵為該第一管部沿著一預定 方向（F方向）從該膨脹室延伸，而該第二管部從該預定方 向與該膨脹室連通》 此外，該排氣系統100之特徵為該排氣管從該預定方向 135981.doc 1354057 與該膨脹室連通。 更具體而吕，該第一管部131從該排氣室12〇向前延伸， 該第二管部132從該向前方向與該排氣室12〇連通。此外’ 該排氣管110亦從該前側與該排氣室12〇連通。因此，配置 該排氣系統100之空間可進一步被減小。該機車1〇之尺寸 的增大可進一步被抑制。 此外該排氣系統100之特徵為該第—管部及該第二管部 經由一回流管部（回流管部133)彼此連接，且一由該回流管 部形成的排氣通道（排氣通道P)係圓弧的，該排氣通道之 一曲率半徑（曲率半徑R)大於在該第一管部之一外端（外端 131 a)及該第一管部之一與該第一管部之該外端相對之外 端（外端132a)之間的該距離（寬度w)之一平分值。 此外’該排氣系統1 00之特徵為，在一沿著該曲率半徑 之該方向的平面上，該回流管部被配置於一由從該膨脹室 之兩個端部（橫向邊緣部120Lb及120Rb)沿著該預定方向延 伸的延長線（延長線L1及L2)形成的區域（區域Ai)中。 如上所述，該排氣通道P之該曲率半徑R大於在該第一管 部131之該外端13 la及該第二管部132之該外端132a之間的 該距離（寬度W)之該平分值。因此，該排氣管道p之彎曲程 度變缓’所以可抑制在該回流管部133中排氣阻力的增 大。此外，該回流管部133被恥置於該區域^中。因此， 配置該排氣系統100的該空間可被進一步減小。 此外’該排氣系統100之特徵為該第二管部包含一突出 進入至該膨脹室中的突出部（突出部141)，在其中複數個排 135981.doc -16- 1354057 氣孔（排氣孔141a)被形成於該突出部之一外周部上。 . 此外該排氣系統100之特徵為該突出部之一前邊緣部被 封閉》 此外，該排氣系統100之特徵為一個或複數個開口（開口 122a)被形成於該連通部中。 • 如上所述，大量排氣孔14h被形成於該突出部141之該 外周部上。該突出部141之一前邊緣部由該罩子142封閉。 φ 此外，該等開口 122a被形成於該連通部122中。因此，可 輕易設定一適當的排氣阻力。更具體而言，該引擎4〇之該 輸出特性可被輕易調整。 該排氣系統100之特徵為包含一用於淨化從該引擎排出 之廢氣的催化器（催化器121)，其中該催化器被配置於該膨 脹室中。 在本實施例中，該催化器121被配置於該排氣室120中。 因此，從該催化器散發出之熱量不易於傳輸至該排氣 • 室120之外側。此外，該催化器121可被抑制不受外側空氣 冷卻。更具體而言，由於該催化器121被維持於一高溫 下’所以該催化器12 1淨化廢氣之能力可被改善。 ° • 此外該排氣系統100之特徵為該連通部之一内徑（内徑 . φ3)小於該催化器之一内徑（内徑φ2)。 此外，該排氣系統100之特徵為該連通部之該内徑大於 該排氣管之一内徑（内徑φΐ)。 、 此外，該排氣系統100之特徵為該消音器經由一連接管 部（連接管部18〇)與該膨脹室連通，其中該連接管部之一= 135981.doc -17- 徑（内徑φ4)大於該連通部之該内徑。 在本實施例中，該連通部i 22之該内徑0大於該排氣管 11〇之該内控φΐ。此外，該連接管部18〇之該内徑中4大於該 連通部122之該内徑φ3。更具體而言，φ1(内徑）<φ3(内 徑）<φ4(内徑）之關係被滿足。因此，該排氣通道ρ之該内徑 向該消音器190逐漸變寬，因此有利於排氣噪音的減少。 此外’在本實施例中’該連通部1 22之該内徑φ3小於該 摧化器121之該内徑φ2。因此，一適當的排氣阻力被提 供，藉此增加該引擎40之動力（扭矩）。 此外’在本實施例中，由於該網狀部i25被提供至該排 氣室120之該内底壁，故該排氣室12〇之該底壁之震動產生 的排氣噪音可被減少。 (4)其他實施例 雖然本發明之該等内容經由本發明之一實施例而被揭示 於占’但部分構成該揭示内容的如上之描述及該等圖式不 應被理解為限制本發明。從該揭示内容，各種替代實施例 對熟習此項技術者應變得顯而易見的。 舉例來說，該排氣室120及該再循環管130可被修改為如 下所述。 (4.1)經修改實例1 圖6為本發明之一經修改實例之一排氣室120A的示意平 面圖。如圖6所示，與該排氣室120相比，該催化器121未 被提供於該排氣室120A中。更具體而言，在該排氣室120 中，該連通部122允許該第一管部131及該排氣管110彼此 135981.doc 1354057 連通》在無該催化器121被提供於該排氣室㈣中而可達成 該廢氣之排氣調整值的情況下，可使用該排氣室12〇心 (4.2)經修改實例2 圖7為本發明之一經修改實例之一排氣室謂的示意平 面圖。如圖7所示，一丑IS ΑΛ- 、 再循環管130B被連接至該排氣室 聽。更具體而言’該再循環管刪被連接至該前邊緣 部120a及該橫向邊緣部12娜。該等廢氣從該前邊緣部1354057 IX. INSTRUCTIONS OF THE INVENTION: TECHNICAL FIELD The present invention relates to an exhaust system and a straddle type vehicle including the same, wherein the exhaust system includes a connection to a slave-engine extension An expansion chamber of the exhaust pipe and a muffler connected to the expansion chamber. [Prior Art] Conventionally, for a straddle type vehicle such as a locomotive, as a configuration widely used in each of the vehicles, an expansion chamber, that is, a so-called exhaust chamber, is disposed in an engine and The middle of a silencer (see, for example, Patent Document 1). Exhaust gas discharged through an exhaust pipe connected to the engine is expanded in the exhaust chamber. Since the exhaust chamber is provided, exhaust noise can be attenuated. Further, since the discharge chamber is disposed between the engine and the muffler, the size of the muffler can be reduced. More specifically, the total length of the exhaust system can be reduced by the exhaust chamber thus disposed. An assembly such as a portion of the exhaust pipe extending from the bow engine and a catalyst for purifying the exhaust gas is disposed in the exhaust chamber. [Patent Document 1] Unexamined Patent Publication No. 10-238332 (page 4, FIG. 1) [Summary of the Invention] [Problems to be Solved by the Invention] However, the above-described conventional exhaust system produces the following Problem described in the case where an exhaust system including an expansion chamber (exhaust chamber) is installed in a small straddle type vehicle (engine exhaust volume is 200 cc or less), 135981.doc will be generated. The problem of a sufficient total length of one of the exhaust systems is not obtained, and thus it is difficult to stably improve the performance of the exhaust system, more specifically, to reduce exhaust noise and improve engine power. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an exhaust system and a straddle type vehicle including the exhaust system, wherein the exhaust system can be connected to In the case of an expansion chamber of an exhaust pipe extending from an engine, the size of the vehicle is prevented from increasing while maintaining a desired performance. [Means for Solving the Problem] In order to solve the above problems, the present invention has a feature described below. According to this feature of the invention, the exhaust system includes - an exhaust pipe connected to an engine that generates a driving force of one of the straddle type vehicles; and an exhaust pipe that communicates with the exhaust pipe and expands the exhaust gas discharged from the engine An expansion chamber; a muffler connected to the expansion; and a recirculation pipe communicating with the expansion chamber. The recirculation: the tube includes a first tube portion and a second tube portion, the first tube portion is expanded from the expansion to the outer side of the expansion chamber, and the second tube portion and the first tube portion and the expansion The chamber is connected; and the expanded chamber includes a portion that allows the first exhaust pipe to communicate with each other in a simple towel. ^ [Effects of the Invention] According to this feature of the present invention, an exhaust system can be provided and a cross-sitting private 3^2' vehicle including the exhaust system, wherein the exhaust system can suppress the straddle The type of soap throws 4> „S大' while maintaining a required performance. [Embodiment] One of the inventions is described below. One embodiment of a straddle type vehicle will refer to the drawings. J&Bei, body, description is about (1) total 135981.doc configuration of straddle-type vehicles, (2) #备$μ embodiment....configuration, (3) effects and advantages, and (4 In the drawings, the same or similar numerals indicate the same or similar parts. The drawings are schematic diagrams, so it should be understood that, for example, the respective size ratios are different from the true size ratios. For example, the actual size should be determined with reference to the following description. When: 4, for example, the size relationship and ratio of each other are different. 0 (1) Overall configuration of the straddle type vehicle A left side view of the locomotive as the straddle type vehicle of the present invention Figure 2 is a right side view of the locomotive 1 in a state in which a component including, for example, a body cover (not shown) is removed. Referring to Figures 1 and 2, the locomotive 10 includes a front wheel 20 and a rear The wheel 90. The locomotive 10 is driven by a driving force generated by the engine 40 to drive the rear wheel. The engine 40 is a single-cylinder four-stroke type. At the same time, the engine 4 is one. Air-cooled, low-displacement type. The bow is mounted to a body frame 30 that forms one of the structures of the locomotive 10. In addition, an exhaust system 100 is coupled to the engine. For example, an exhaust pipe 110 is connected to the cylinder head 4〇a. The exhaust system 1〇〇 includes the exhaust pipe 110, an exhaust chamber i2〇, and a muffler. 90« The exhaust chamber 12〇 is in communication with the exhaust pipe 11. The muffler 19 is connected to the row by a connecting pipe portion 180 (not shown in FIG. 1 and FIG. 2, Ss_arel, see FIG. 3) The plenum 12 is connected to each other. More specifically, the venting chamber 12 () is disposed between the engine 13598 丨.doc 1354057 40 and the muffler 190. In the venting chamber 120, The exhaust wave discharged from the exhaust pipe 11〇 is caused to expand. The exhaust chamber 12A has a box shape. According to the embodiment, the exhaust chamber 120 is provided with an expansion chamber. The muffler 190 is located. The exhaust system is disposed in one of the rear end portions. More specifically, the muffler 190 is disposed on the right side of the rear wheel 9. The exhaust gas is exhausted from an exhaust outlet 19A. The exhaust chamber 120 And the muffler 19 is configured to reduce the exhaust noise generated by the engine 4. In the present embodiment, since the exhaust chamber 120 is provided, the muffling is performed with respect to the case where the exhaust chamber 120 is not provided. The size of the device 19 is reduced. More specifically, the total length of the exhaust system 100 is reduced relative to the case where the exhaust chamber i 2 is not provided. (2) Configuration of the exhaust system The configuration of the exhaust system 100 will be described below. More specifically, the overall configuration of the exhaust system 100, the configuration of the exhaust chamber 12 (expansion chamber), and the configuration of a recirculation tube in communication with the exhaust chamber 120 will be described below. (2.1) Overall Configuration FIG. 3 is an overall perspective view of the exhaust system 1 〇〇. Referring to Fig. 3, the exhaust system 100 includes the exhaust pipe 11 〇, the exhaust chamber 12A, a recirculation pipe 130, the connecting pipe portion 180, and the muffler 190. The exhaust pipe 110 is formed by bending a pipe having a circular cross section. A connecting portion 111 for connecting to the cylinder head 40a is supplied to the exhaust pipe 110. The exhaust chamber 120 is in communication with the exhaust pipe 110. A mounting portion 123 is provided 135981.doc -10· 1354057 in one of the lateral edge portions i2〇Lb of the exhaust chamber 120. Further, a mounting portion U4 is provided to the right end of one of the front edge portions 12a of the exhaust chamber ι2. The exhaust chamber 120 is attached to the vehicle body frame 30 by using the mounting portions i 23 and 124. The recirculation pipe 130 communicates with the front edge portion 120a of the exhaust chamber 120. The recirculation pipe 130 is used to recirculate exhaust gas discharged from the exhaust chamber 120 to the exhaust chamber 120. The connecting pipe portion 180 communicates with one of the lateral edge portions i20Rb of the exhaust chamber 120. The muffler 190 is in communication with the connecting pipe portion 180. More specifically, the muffler 190 is connected to the The gas chamber 12 is connected to each other. The exhaust outlet 190a is formed in the muffler 190, wherein the exhaust outlet 190a is discharged through the exhaust pipe 11, the exhaust chamber 12, the recirculation pipe 130, and the connecting pipe portion 18. Exhausted gas. The muffler 190 has a cylindrical shape and is disposed along the front-rear direction of the locomotive 10. A protector 191 is provided outside the muffler 190. (2.2) Configuration of Expansion Chamber Fig. 4 is a perspective view showing the discharge chamber 12A and the recirculation pipe 130 of the expansion chamber of the present embodiment. One of the internal configurations of the exhaust chamber 12 is shown in Fig. 4, among other components. As shown in FIG. 4, a catalyst 121 for purifying exhaust gas discharged from the engine 40 (see FIGS. 2 and 2) is disposed in the box-shaped exhaust chamber 丨2. The catalyst 121 is connected to the exhaust pipe 11A. The exhaust gases that have flowed through the interior of the exhaust pipe n〇 are guided by the catalyst 121. A communication portion 122 is in communication with the catalyst 121. The communication portion 122 is further 135981.doc 1354057 in communication with the recirculation tube 130, and more specifically, a first tube portion 131. An opening 122a is formed in the communication portion 122. More specifically, the opening 122a is formed immediately after the catalyst 121. In the present embodiment, the opening 122a is formed on an upper surface of the communication portion 122. Further, an opening (not shown) identical to the opening 122a is formed on a lower surface of the communication portion 122 opposite to the opening 122a. . That is, two openings are formed in the communication portion 122. A mesh portion 125 is provided in one of the inner bottom walls of the exhaust chamber 12'. In the present embodiment, a steel plate formed into a mesh shape is attached to an inner bottom wall of the exhaust chamber 12A. (2.3) Arrangement of the recirculation pipe As shown in Fig. 4, the recirculation pipe 13A includes the first pipe portion Hi, a second pipe portion 13 2, and a return pipe portion 13 3 . The first tube portion 131 extends from the exhaust chamber 12'' to the outside of the exhaust chamber 12''. The first pipe portion 131 extends from the exhaust chamber 12A along the forward direction of the locomotive 1 (in the F direction in the drawing). The second pipe portion 132 is connected to the first pipe portion 131 and the exhaust chamber by the return pipe portion 133. Connected. The second pipe portion 132 communicates with the exhaust chamber 120 from the front side of the locomotive 1 . In the present embodiment, the exhaust pipe 11A is disposed substantially parallel to the first pipe portion 131 and the second pipe portion 132. More specifically, the exhaust pipe UO is also in communication with the exhaust pipe (10) from the front side of the locomotive 10. The return pipe portion 133 connects the first pipe portion 131 to the second pipe portion 132. Therefore, the exhaust gas that has flowed through the first pipe portion 131 is guided to the second pipe portion 132 by the return pipe portion 135981.doc -12-1354057 133. The second pipe portion U2 includes a protrusion into the second pipe portion. In the ΐ32: two: discharged from the communication portion 122 to the recirculation pipe 13. The waste in the discharge is discharged from the "Hai-large outlet" 141 into the exhaust chamber 12A. More specifically, the exhaust gas discharged from the protruding portion M1 is swollen in the exhaust chamber 12A. . A plurality of exhaust holes M1a are formed around the outer peripheral portion of the protruding portion 141. These vent holes 14U are all circular and are formed around one outer peripheral portion of the projection i4i. The exhaust gases are discharged to the exhaust chamber 120 via the exhaust holes 141 & Λ In the present embodiment, one of the front edge portions of the protruding portion 141 is closed. More specifically, a cover 142 is attached to a front end portion of the protruding portion 141. Figure 5 is a plan view of the exhaust chamber 120 and the recirculation tube 13A. As shown in FIG. 5, the exhaust gases discharged from the engine 40 (see FIGS. 2 and 2) are guided from the exhaust pipe no via the catalyst 121 and the communication portion 122 disposed in the exhaust chamber 120. The recirculation pipe 13 is in the middle. The exhaust gas introduced into the recirculation pipe 13 is discharged into the exhaust chamber 120 from the projections 41 disposed in the exhaust chamber 120. The exhaust gas discharged into the exhaust chamber 120 and expanded therein is guided to the muffler 19A via the connecting pipe portion 180. An exhaust passage P formed by the return pipe portion 133 is arcuate. One radius of curvature (curvature radius R) of the exhaust passage P is larger than between the outer end 131a of the first pipe portion 131 and the outer end 132a of the second pipe portion 132 and the outer end i31a The value of the distance (width w) is divided equally. According to the present embodiment, in order to more easily manufacture the return pipe portion 133 having the radius of curvature R, a two-piece structure including upper and lower portions (not shown) is used for the return pipe portion 133 by 135981.doc -13 - 1354057. . More specifically, the return pipe portion in is formed not by the bending treatment of a pipe but by welding the upper and lower portions. Further, the return pipe portion 133 is disposed on a plane along the direction of the radius of curvature r. More specifically, 'in view of the plan view of the exhaust system 100, the return pipe portion 133 is disposed at a position of the two ends of the exhaust chamber 12 or more specifically The edge portion 12〇Lb&12〇Rb is formed in the area A1 formed by the extension lines LI, L2 of the front side of the locomotive 10, and in this embodiment, an inner diameter φ3 of the communication portion 122 is larger than the exhaust pipe One of the inner diameters φ 110. Further, the inner diameter 〇 of one of the connecting pipe portions 18 is larger than the inner diameter φ3 of the communicating portion 122. That is, the relationship of φ1 (inner diameter) < inner diameter) < Φ4 (inner diameter) is satisfied. Further, in the present embodiment, the inner diameter of the communication portion 122 is smaller than the inner diameter φ2 of the catalytic benefit 121. (3) Effects and Advantages • The exhaust system (exhaust system 100) of the present embodiment includes an exhaust e (row) connected to an engine (engine 40) that generates a driving force of the straddle type vehicle (locomotive 10) a gas pipe 11〇); an expansion chamber (exhaust chamber 12〇) that communicates with the exhaust pipe and expands the exhaust gas path discharged from the engine; and a dissipator that communicates with the expansion chamber 190). The exhaust system 1 〇〇 includes a recirculation pipe (recirculation pipe 13〇) that communicates with the expansion chamber. The recirculation pipe includes a first pipe portion (the first pipe portion 131) from the outer side of the expansion chamber of the expansion chamber, and a second pipe portion (the second pipe) communicating with the second phase P and the expansion chamber Part 132). The expansion chamber includes the communication portion (communication portion 122) that allows the first pipe portion and the exhaust pipe to communicate with each other in the expansion chamber 135981.doc. According to the exhaust system 100, the recirculation pipe 130 for recirculating exhaust gas into the exhaust chamber 120 is provided outside the exhaust chamber 12b. Therefore, the exhaust passage P having the necessary length can be easily obtained. Further, the re-circle tube 130 is disposed outside the exhaust chamber 120. Therefore, the substantial volume capacity of one of the exhaust chambers 12 is increased as compared with the case where an exhaust pipe having the same length as the length of the recirculation pipe 130 is disposed in the exhaust chamber 120. Therefore, the performance of reducing exhaust noise can be improved. More specifically, according to the exhaust system 100, the increase in the size of the locomotive 1 can be suppressed, and the required performance can be obtained. For example, assume that an exhaust system similar to a conventional exhaust system is disposed in a small locomotive 10 that includes an engine 40 having a displacement of 150 CC. In this case, since an exhaust chamber having a sufficient volume capacity cannot be provided, the exhaust noise reduction effect is limited. Furthermore, the engine power, in particular the low speed torque, is reduced because a sufficient total length of one of the exhaust passages P cannot be obtained. Further, a heavy exhaust chamber 120 is disposed in the front and rear directions of the locomotive 1 〇 A central portion and in the lowest position of one of the locomotives. Therefore, the center of gravity of the locomotive 10 is lowered, and the running stability, operability, and the like can be improved. Further, the exhaust system 100 is characterized in that the first pipe portion extends from the expansion chamber along a predetermined direction (F direction), and the second pipe portion communicates with the expansion chamber from the predetermined direction. The gas system 100 is characterized in that the exhaust pipe is in communication with the expansion chamber from the predetermined direction 135981.doc 1354057. More specifically, the first tube portion 131 extends forward from the exhaust chamber 12, and the second tube portion 132 communicates with the exhaust chamber 12 from the forward direction. Further, the exhaust pipe 110 is also in communication with the exhaust chamber 12 from the front side. Therefore, the space in which the exhaust system 100 is disposed can be further reduced. The increase in the size of the locomotive can be further suppressed. In addition, the exhaust system 100 is characterized in that the first pipe portion and the second pipe portion are connected to each other via a return pipe portion (return pipe portion 133), and an exhaust passage formed by the return pipe portion (exhaust passage) P) is an arc having a radius of curvature (curvature radius R) greater than one of the outer ends (outer end 131 a) of the first tube portion and one of the first tube portions and the first tube The outer end of the portion is equally divided by the distance (width w) between the outer end (outer end 132a). Further, the exhaust system 100 is characterized in that, in a plane along the direction of the radius of curvature, the return pipe portion is disposed at a position from the both ends of the expansion chamber (the lateral edge portion 120Lb and 120Rb) A region (region Ai) formed by an extension line (extension lines L1 and L2) extending in the predetermined direction. As described above, the radius of curvature R of the exhaust passage P is greater than the distance (width W) between the outer end 13 la of the first pipe portion 131 and the outer end 132 a of the second pipe portion 132. The bisector value. Therefore, the degree of bending of the exhaust duct p is slowed, so that an increase in exhaust resistance in the return pipe portion 133 can be suppressed. Further, the return pipe portion 133 is shame placed in the region ^. Therefore, the space in which the exhaust system 100 is disposed can be further reduced. In addition, the exhaust system 100 is characterized in that the second pipe portion includes a protrusion (projecting portion 141) protruding into the expansion chamber, in which a plurality of rows 135981.doc -16 - 1354057 air holes (venting holes) 141a) is formed on one of the outer peripheral portions of the projection. Further, the exhaust system 100 is characterized in that one of the front edge portions of the projection is closed. Further, the exhaust system 100 is characterized in that one or a plurality of openings (openings 122a) are formed in the communication portion. • As described above, a large number of vent holes 14h are formed on the outer peripheral portion of the protruding portion 141. One of the front edge portions of the protruding portion 141 is closed by the cover 142. Further, the openings 122a are formed in the communicating portion 122. Therefore, an appropriate exhaust resistance can be easily set. More specifically, the output characteristics of the engine can be easily adjusted. The exhaust system 100 is characterized by a catalyst (catalyst 121) for purifying exhaust gas discharged from the engine, wherein the catalyst is disposed in the expansion chamber. In the present embodiment, the catalyst 121 is disposed in the exhaust chamber 120. Therefore, the heat radiated from the catalyst is not easily transmitted to the outside of the exhaust chamber 120. Further, the catalyst 121 can be suppressed from being cooled by the outside air. More specifically, since the catalyst 121 is maintained at a high temperature, the ability of the catalyst 12 to purify the exhaust gas can be improved. ° • Further, the exhaust system 100 is characterized in that an inner diameter (inner diameter φ3) of the communication portion is smaller than an inner diameter (inner diameter φ2) of the catalyst. Further, the exhaust system 100 is characterized in that the inner diameter of the communication portion is larger than an inner diameter (inner diameter φ ΐ) of the exhaust pipe. Further, the exhaust system 100 is characterized in that the muffler is in communication with the expansion chamber via a connecting pipe portion (connecting pipe portion 18A), wherein one of the connecting pipe portions = 135981.doc -17- diameter (inner diameter φ4 ) is larger than the inner diameter of the connecting portion. In this embodiment, the inner diameter 0 of the communicating portion i 22 is greater than the internal control φ 该 of the exhaust pipe 11 . Further, the inner diameter 4 of the connecting pipe portion 18 is larger than the inner diameter φ3 of the communicating portion 122. More specifically, the relationship of φ1 (inner diameter) < φ3 (inner diameter) < φ4 (inner diameter) is satisfied. Therefore, the inner diameter of the exhaust passage ρ is gradually widened toward the muffler 190, thereby facilitating the reduction of exhaust noise. Further, in the present embodiment, the inner diameter φ3 of the communicating portion 1 22 is smaller than the inner diameter φ2 of the sterilizer 121. Therefore, a proper exhaust resistance is provided, thereby increasing the power (torque) of the engine 40. Further, in the present embodiment, since the net portion i25 is supplied to the inner bottom wall of the exhaust chamber 120, the exhaust noise generated by the vibration of the bottom wall of the exhaust chamber 12 can be reduced. (4) Other Embodiments The present invention is not limited by the foregoing description of the present invention and is not to be construed as limiting the invention. From this disclosure, various alternative embodiments will become apparent to those skilled in the art. For example, the exhaust chamber 120 and the recirculation tube 130 can be modified as described below. (4.1) Modified Example 1 Fig. 6 is a schematic plan view of an exhaust chamber 120A which is one modified example of the present invention. As shown in Fig. 6, the catalyst 121 is not provided in the exhaust chamber 120A as compared with the exhaust chamber 120. More specifically, in the exhaust chamber 120, the communication portion 122 allows the first pipe portion 131 and the exhaust pipe 110 to communicate with each other 135981.doc 1354057" provided in the exhaust chamber without the catalyst 121 (4) In the case where the exhaust gas adjustment value of the exhaust gas can be achieved, the exhaust chamber 12 core (4.2) can be used. Modified Example 2 FIG. 7 is a schematic plan view of the exhaust chamber of one of the modified examples of the present invention. . As shown in Fig. 7, an ugly IS ΑΛ-, recirculation pipe 130B is connected to the exhaust chamber. More specifically, the recirculation pipe is connected to the front edge portion 120a and the lateral edge portion 12a. The exhaust gases from the front edge portion
12〇a導向至該再循環管130B，且從該橫向邊緣部120Rb排 放至該排氣室120B。 更具體而言，該再循環管之該形狀及其至該排氣室的該 連接位置可相應於例如其他安裝於該機車1〇中的組件而被 改變》 (4.3)經修改實例3 圖8為一連接至本發明之一經修改實例之一再循環管 130C之該排氣室120的示意平面圖。如圖8所示，該再循環 官13 0C之該曲率半徑小於該再循環管13〇之該曲率半徑。 根據對該引擎40所要求的輸出特性，該再循環管13〇(：可代 替該再循環管130而被使用。 此外’在上述該實施例中’雖然整個該連通部122被設 置於該排氣室120中。但該連通部122之一部分可被設置於 該排氣室120之該外側。更具體而言，該連通部122之該後 端可被定位於該排氣室120之該後端之後部。 在上述實施例中，雖然φΐ(内徑）<φ3(内徑）<φ4(内徑）之 該關係被滿足，但該關係並非必須被滿足。 135981.doc 1354057 二述實施例中’雖然該複數個開口 i22a被形成於該連 =⑵中，但亦可只形成-個開D122ae或者，不須形 成開口 122a。 述實施例中，雖然該突出部丨41之該前邊緣部被該 封閉C該大出部141自該前邊緣部可被打開。此 外’在該突出部141之該前邊緣部被打開的情況下該等 排氣孔141a之不須被形成。12〇a is guided to the recirculation pipe 130B, and is discharged from the lateral edge portion 120Rb to the exhaust chamber 120B. More specifically, the shape of the recirculation pipe and the connection position to the exhaust chamber may be changed corresponding to, for example, other components installed in the locomotive 1" (4.3) Modified Example 3 FIG. A schematic plan view of the venting chamber 120 connected to a recirculation tube 130C of one of the modified examples of the present invention. As shown in Fig. 8, the radius of curvature of the recirculation officer 130C is smaller than the radius of curvature of the recirculation pipe 13〇. According to the output characteristics required for the engine 40, the recirculation pipe 13〇 can be used instead of the recirculation pipe 130. Further, in the above-described embodiment, the entire communication portion 122 is disposed in the row. In the gas chamber 120, a portion of the communication portion 122 may be disposed outside the exhaust chamber 120. More specifically, the rear end of the communication portion 122 may be positioned behind the exhaust chamber 120. In the above embodiment, although the relationship of φ ΐ (inner diameter) < φ3 (inner diameter) < φ 4 (inner diameter) is satisfied, the relationship does not have to be satisfied. 135981.doc 1354057 In the embodiment, although the plurality of openings i22a are formed in the connection = (2), only one opening D122ae may be formed or the opening 122a may not be formed. In the embodiment, although the protrusion 41 is before the front portion The edge portion is opened by the closing portion C from the front edge portion. Further, in the case where the front edge portion of the protruding portion 141 is opened, the vent holes 141a need not be formed.
在上述該實施例中，該排氣管11〇、該第一管部i3i及該 第一管部132沿著該車寬方向並置。然而，該排氣管"〇、 該第一官部131及該第二管部i32並非必須被並置。或者， 該排氣管11〇、該第一管部131及該第二管部132可被並置 於該機車10之該垂直方向中。 因此，當然，本發明包含多種未描述於此的其他實施 例。所以’根據上述，本發明之該技術範圍被在該等技術 方案中列出的適當的發明特定項目所界定。 【圖式簡單說明】 圖1為本發明之一實施例之一機車10的左侧視圖。 圖2為處於包含例如一車體蓋之組件被移除之狀態中的 本發明之該實施例之該機車10的右側視圖。 圖3為本發明之該實施例之一排氣系統100之一總體透視 圖。 圖4為本發明之該實施例之一排氣室120及一再循環管 130之一透視圖。 圖5為本發明之該實施例之該排氣室120及該再循環管 135981.doc •20· 1354057 130之一平面圖。 圖6為本發明之一經修改實例之一排氣室120A之一示意 平面圖。 圖7為本發明之一經修改實例之一排氣室120B之一示意 平面圖。 圖8為一連接至本發明自一經修改實例之一再循環管 130C的排氣室120之一示意平面圖。In the above embodiment, the exhaust pipe 11A, the first pipe portion i3i, and the first pipe portion 132 are juxtaposed in the vehicle width direction. However, the exhaust pipe ", the first official portion 131 and the second tubular portion i32 do not have to be juxtaposed. Alternatively, the exhaust pipe 11A, the first pipe portion 131, and the second pipe portion 132 may be juxtaposed in the vertical direction of the locomotive 10. Thus, of course, the invention encompasses a variety of other embodiments not described herein. Therefore, in accordance with the above, the technical scope of the present invention is defined by the appropriate invention specific items listed in the technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a left side view of a locomotive 10 according to an embodiment of the present invention. Fig. 2 is a right side view of the locomotive 10 of the embodiment of the present invention in a state in which a component such as a body cover is removed. Figure 3 is a general perspective view of one of the exhaust systems 100 of this embodiment of the present invention. Figure 4 is a perspective view of one of the exhaust chamber 120 and a recirculation tube 130 of the embodiment of the present invention. Figure 5 is a plan view of the exhaust chamber 120 and the recirculation tube 135981.doc • 20· 1354057 130 of the embodiment of the present invention. Figure 6 is a schematic plan view of one of the exhaust chambers 120A of one modified example of the present invention. Figure 7 is a schematic plan view of one of the exhaust chambers 120B of one of the modified examples of the present invention. Figure 8 is a schematic plan view of a venting chamber 120 coupled to a recirculation tube 130C of a modified example of the present invention.
【主要元件符號說明】 10 機車 20 前輪 30 車體框架 40 引擎 40a 汽缸頭 90 後輪 100 排氣系統 110 排氣管 111 連接部 120、120A、120B 排氣室 120a 前邊緣部 120Lb、120Rb 橫向邊緣部 121 催化器 122 連通部 122a 開口 123 ' 124 安裝部 135981.doc -21 - 1251354057[Main component symbol description] 10 Locomotive 20 Front wheel 30 Body frame 40 Engine 40a Cylinder head 90 Rear wheel 100 Exhaust system 110 Exhaust pipe 111 Connection portion 120, 120A, 120B Exhaust chamber 120a Front edge portion 120Lb, 120Rb Lateral edge Portion 121 Catalyst 122 Connecting portion 122a Opening 123' 124 Mounting portion 135981.doc -21 - 1251354057
130、130B、130C 131 131a > 132a 132 133 141 141a 142 180 190 190a 191 A1 LI、L2130, 130B, 130C 131 131a > 132a 132 133 141 141a 142 180 190 190a 191 A1 LI, L2
PP
R 網狀部 再循環管 第一管部 外端 第二管部 回流管部 突出部 排氣孔 罩子 連接管部 消音器 排氣出口 保護器 區域 延長線 排氣通道· 曲率半徑 135981.doc -22·R mesh recirculation pipe first pipe outer end second pipe part return pipe section protrusion vent hole cover connecting pipe section muffler exhaust outlet protector area extension line exhaust passage · radius of curvature 135981.doc -22 ·