JP2014069597A - Motorcycle - Google Patents

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JP2014069597A
JP2014069597A JP2012214756A JP2012214756A JP2014069597A JP 2014069597 A JP2014069597 A JP 2014069597A JP 2012214756 A JP2012214756 A JP 2012214756A JP 2012214756 A JP2012214756 A JP 2012214756A JP 2014069597 A JP2014069597 A JP 2014069597A
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exhaust pipe
vehicle
type engine
cylinder
motorcycle
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JP5966819B2 (en
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Ginga Kobayashi
銀河 小林
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Suzuki Motor Corp
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Suzuki Motor Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a motorcycle capable of improving the layout of a front exhaust pipe and a rear exhaust pipe connected to a V-type engine, securing the curvature radius of the U-shaped bent part of the rear exhaust pipe, and easily maintaining the balance of an exhaust flow passage length between front and rear cylinders, and including a center stand.SOLUTION: A motorcycle 1 includes a V-type engine 3 having a front cylinder 18 and a rear cylinder 19, a front exhaust pipe 22 drooping down from the front face of the front cylinder 18 and extending to the rear side of a vehicle below the V-type engine 3, a drooping part 41 drooping down from the rear side face of the rear cylinder 19, a rear exhaust pipe 23 successive from the drooping part 41, extending to the front of the vehicle below the V-type engine 3, and bent and reversed to return to the rear side of the vehicle, a collecting pipe 42 for collecting the front exhaust pipe 22 and the rear exhaust pipe 23, and a center stand 43 having an oscillation center line C positioned to overlap a downward extension area A in which the drooping part 41 is virtually extended in its longitudinal direction when seen from a vehicle side face and configured to support the stopped vehicle in an upright state.

Description

本発明は、自動二輪車に関する。   The present invention relates to a motorcycle.

シリンダ列がV字型に傾斜する、所謂V型エンジンを備える自動二輪車が知られている。特にシリンダ列が車両の前後に配置されるV型エンジンを備える自動二輪車は、前側シリンダの前側面から前側排気管を、後側シリンダの後ろ側面から後側排気管をそれぞれ伸ばす。前側排気管および後側排気管は、クランクケース等、V型エンジンの下方で集合管またはチャンバに接続される。   A motorcycle including a so-called V-type engine in which a cylinder row is inclined in a V shape is known. In particular, a motorcycle including a V-type engine in which cylinder rows are arranged in front and rear of a vehicle extends a front exhaust pipe from the front side of the front cylinder and a rear exhaust pipe from the rear side of the rear cylinder. The front exhaust pipe and the rear exhaust pipe are connected to a collecting pipe or a chamber below the V-type engine, such as a crankcase.

ところで、後側排気管がチャンバへ到達する経路は、排気の流れ方向に沿って見ると、V型エンジンの後ろ側から下方へ垂下し、V型エンジンよりも下方で車両の前方へ延び、U字形状に屈曲して反転し車両の後方へ戻る。後側排気管は、このような経路を辿って前側排気管に合流し、集合管またはチャンバ(チャンバ)に接続される。この後側排気管のU字形状屈曲部は、排気流に対する圧力損失を小さくするため、曲率半径をより大きく確保できることが好ましい。   By the way, the path through which the rear exhaust pipe reaches the chamber is drooping downward from the rear side of the V-type engine when viewed along the exhaust flow direction, and extends forward of the vehicle below the V-type engine. Bend into a letter shape, turn over and return to the rear of the vehicle. The rear exhaust pipe follows such a path, joins the front exhaust pipe, and is connected to the collecting pipe or the chamber. It is preferable that the U-shaped bent portion of the rear exhaust pipe can secure a larger curvature radius in order to reduce pressure loss with respect to the exhaust flow.

このような排気系統とともに、センタースタンドを備える自動二輪車が知られている(例えば、特許文献1参照)。   A motorcycle including a center stand with such an exhaust system is known (see, for example, Patent Document 1).

特開2010−235055号公報JP 2010-235055 A

車両のバンク角の抑制を回避する観点では、V型エンジンまたは車体フレームに対してセンタースタンドおよび排気系統を幅広く配置することは好ましくなく、同程度であることが望ましい。したがって、センタースタンドおよびその揺動軸芯を配置する箇所では、排気系統に割り当て可能な幅寸法は抑制される。   From the viewpoint of avoiding the suppression of the bank angle of the vehicle, it is not preferable to arrange the center stand and the exhaust system widely with respect to the V-type engine or the vehicle body frame, and it is desirable that they are approximately the same. Therefore, the width dimension that can be allocated to the exhaust system is suppressed at the location where the center stand and the swing axis are disposed.

ところで、特許文献1に記載の自動二輪車は、H文字形状のセンタースタンドの内側ではなく、その外側に後側排気管を併設して前方へ延ばす。このようなレイアウトの都合上、特許文献1に記載の自動二輪車は、センタースタンドの左右の脚間の幅がV型エンジンまたは車体フレームに対して狭くなる。そうすると、前側排気管や後側排気管よりも大径なチャンバをセンタースタンドの脚間に配置することが難しくなる。また、チャンバと後輪との干渉を回避するために、チャンバをセンタースタンドよりも車両前側へ配置することが必要になる。他方、後側排気管は、チャンバよりもさらに車両の前側でU字形状に屈曲し、さらに前側排気管に合流してチャンバに接続せねばならず、必要以上に長くなり、前側排気管に対して前後それぞれのシリンダからチャンバまでの長さに差を生じる。つまり、後側排気管の方が前側排気管よりも長くなる。   By the way, the motorcycle described in Patent Document 1 extends forward by providing a rear exhaust pipe on the outside of the H-shaped center stand, not on the inside. For the convenience of such a layout, in the motorcycle described in Patent Document 1, the width between the left and right legs of the center stand is narrower than the V-type engine or the body frame. If it does so, it will become difficult to arrange | position the chamber larger diameter than a front side exhaust pipe and a rear side exhaust pipe between the legs of a center stand. Further, in order to avoid interference between the chamber and the rear wheel, it is necessary to arrange the chamber on the vehicle front side with respect to the center stand. On the other hand, the rear exhaust pipe must be bent in a U shape at the front side of the vehicle further than the chamber, and must be joined to the front exhaust pipe and connected to the chamber. Thus, there is a difference in the length from the front and rear cylinders to the chamber. That is, the rear exhaust pipe is longer than the front exhaust pipe.

そこで、本発明は、V型エンジンにそれぞれ接続される前側排気管、後側排気管のレイアウトを改善し、後側排気管のU字形状屈曲部の曲率半径を確保し、前後のシリンダ間で排気流路長のバランスを保ち易く、かつセンタースタンドを備える自動二輪車を提案する。   Therefore, the present invention improves the layout of the front exhaust pipe and the rear exhaust pipe respectively connected to the V-type engine, ensures the curvature radius of the U-shaped bent portion of the rear exhaust pipe, and between the front and rear cylinders. We propose a motorcycle that is easy to maintain the balance of the exhaust flow path length and that has a center stand.

前記の課題を解決するため本発明に係る自動二輪車は、前側シリンダと後側シリンダとを有するV型エンジンと、前記前側シリンダの前側面から下方へ垂下して前記V型エンジンよりも下方で車両の後方へ延びる前側排気管と、前記後側シリンダの後ろ側面から下方へ垂下する垂下部、前記垂下部に連接して前記V型エンジンよりも下方で車両の前方へ延び、屈曲して反転し車両の後方へ戻る後側排気管と、前記前側排気管と前記後側排気管とを合流させる集合管と、前記垂下部をその長手方向へ仮想的に延長させた下方延長領域に対して車両側面視で重なる位置に揺動中心線を有し、停車する車両を直立状態で支持するセンタースタンドと、を備える。   In order to solve the above-described problems, a motorcycle according to the present invention includes a V-type engine having a front cylinder and a rear cylinder, a vehicle that hangs downward from a front side surface of the front cylinder and is lower than the V-type engine. A front exhaust pipe that extends rearward of the rear cylinder, a hanging portion that hangs downward from the rear side surface of the rear cylinder, and that extends to the front of the vehicle below the V-type engine and bends and reverses below the V-type engine. A vehicle with respect to a rear exhaust pipe that returns to the rear of the vehicle, a collecting pipe that joins the front exhaust pipe and the rear exhaust pipe, and a downward extension region in which the hanging portion is virtually extended in the longitudinal direction thereof A center stand having a swing center line at a position overlapping in a side view and supporting a vehicle to be stopped in an upright state.

本発明によれば、V型エンジンにそれぞれ接続される前側排気管、後側排気管のレイアウトを改善し、後側排気管のU字形状屈曲部の曲率半径を確保し、前後のシリンダ間で排気流路長のバランスを保ち易く、かつセンタースタンドを備える自動二輪車を提供できる。   According to the present invention, the layout of the front exhaust pipe and the rear exhaust pipe connected to the V-type engine is improved, the radius of curvature of the U-shaped bent portion of the rear exhaust pipe is secured, and the front and rear cylinders are secured. It is possible to provide a motorcycle that easily maintains the balance of the exhaust flow path length and that includes a center stand.

本発明の実施形態に係る自動二輪車を示す右側面図。1 is a right side view showing a motorcycle according to an embodiment of the present invention. 本発明の実施形態に係る自動二輪車を示す左側面図。1 is a left side view showing a motorcycle according to an embodiment of the present invention. 本発明の実施形態に係る自動二輪車の要部を示す正面図。The front view which shows the principal part of the motorcycle which concerns on embodiment of this invention. 本発明の実施形態に係る自動二輪車の要部を示す左側面図。The left view which shows the principal part of the motorcycle which concerns on embodiment of this invention. 本発明の実施形態に係る自動二輪車の要部を示す右側面図。The right view which shows the principal part of the motorcycle which concerns on embodiment of this invention. 本発明の実施形態に係る自動二輪車の要部を示す背面図。The rear view which shows the principal part of the motorcycle which concerns on embodiment of this invention. 本発明の実施形態に係る自動二輪車の要部を示す底面図。The bottom view which shows the principal part of the motorcycle which concerns on embodiment of this invention. 本発明の実施形態に係る自動二輪車の要部を示す左側面図。The left view which shows the principal part of the motorcycle which concerns on embodiment of this invention. 本発明の実施形態に係る自動二輪車の要部を示す右側面図。The right view which shows the principal part of the motorcycle which concerns on embodiment of this invention. 本発明の実施形態に係る自動二輪車の要部を示す底面図。The bottom view which shows the principal part of the motorcycle which concerns on embodiment of this invention.

以下、本発明に係る自動二輪車の実施の形態について、図1から図10を参照して説明する。   Embodiments of a motorcycle according to the present invention will be described below with reference to FIGS.

図1は、本発明の実施形態に係る自動二輪車を示す右側面図である。   FIG. 1 is a right side view showing a motorcycle according to an embodiment of the present invention.

図2は、本発明の実施形態に係る自動二輪車を示す左側面図である。   FIG. 2 is a left side view showing the motorcycle according to the embodiment of the present invention.

図1および図2に示すように、本実施形態に係る自動二輪車1は、車両の前後に延びる車体フレーム2と、車体フレーム2に固定されるV型エンジン3と、車体フレーム2の前方に配置されて車両の左右方向へ操舵自在に支持されるステアリング機構5と、車体フレーム2の前方に配置されてステアリング機構5に回転自在に支持される前輪6と、車体フレーム2の後方に配置されて車両の上下方向へ揺動自在に支持される後輪懸架装置7と、車体フレーム2の後方に配置されて後輪懸架装置7に回転自在に支持される後輪9と、を備える。   As shown in FIGS. 1 and 2, the motorcycle 1 according to the present embodiment is disposed in front of the vehicle body frame 2, a vehicle body frame 2 that extends in the front-rear direction of the vehicle, a V-type engine 3 that is fixed to the vehicle body frame 2. The steering mechanism 5 is supported so as to be steerable in the left-right direction of the vehicle, the front wheel 6 is disposed in front of the body frame 2 and is rotatably supported by the steering mechanism 5, and is disposed behind the body frame 2. A rear wheel suspension device 7 that is swingably supported in the vertical direction of the vehicle and a rear wheel 9 that is disposed behind the vehicle body frame 2 and is rotatably supported by the rear wheel suspension device 7 are provided.

なお、以下の説明における上下前後左右の向きは、自動二輪車1の搭乗者から見て左手側を自動二輪車1の左方、搭乗者から見て右手側を自動二輪車1の右方と定義する。自動二輪車1の搭乗者の頭部側を自動二輪車1の上方、その反対側を自動二輪車1の下方と定義する。自動二輪車1を構成する各部の方向は自動二輪車1と同一とする。   In the following description, the up / down / front / rear and left / right directions are defined as the left side of the motorcycle 1 when viewed from the passenger of the motorcycle 1 and the right hand side of the motorcycle 1 when viewed from the passenger. The head side of the passenger of the motorcycle 1 is defined as the upper side of the motorcycle 1 and the opposite side is defined as the lower side of the motorcycle 1. The direction of each part constituting the motorcycle 1 is the same as that of the motorcycle 1.

車体フレーム2は、例えばツインチューブ型である。車体フレーム2は、車体フレーム2の前部に配置されるヘッドパイプ11と、ヘッドパイプ11の直後で車両の幅方向に広がりつつ斜め後ろ下方に延びる左右一対のメインフレーム12と、メインフレーム12の後端部に一体的に接続されて略下方に向かって延びる左右一対のセンターフレーム13と、メインフレーム12の後端から斜め後上方に向かって延びる左右一対のシートフレーム15と、を備える。   The body frame 2 is, for example, a twin tube type. The vehicle body frame 2 includes a head pipe 11 disposed at the front of the vehicle body frame 2, a pair of left and right main frames 12 extending in the vehicle width direction immediately after the head pipe 11 and extending obliquely rearward and downward, A pair of left and right center frames 13 integrally connected to the rear end portion and extending substantially downward and a pair of left and right seat frames 15 extending obliquely rearward and upward from the rear end of the main frame 12 are provided.

メインフレーム12は乗員が跨ぐのに好適な適宜の幅まで車両の幅方向に広がる。   The main frame 12 extends in the width direction of the vehicle to an appropriate width suitable for an occupant to straddle.

ヘッドパイプ11はステアリング機構5を操舵自在に支持する。   The head pipe 11 supports the steering mechanism 5 so as to be steerable.

センターフレーム13はピボット部16を備える。ピボット部16は後輪懸架装置7を揺動自在に支持する。   The center frame 13 includes a pivot portion 16. The pivot portion 16 supports the rear wheel suspension device 7 in a swingable manner.

V型エンジン3は、車両の前後方向に見て前輪6と後輪9との間に配置されて車体フレーム2に設けられる。V型エンジン3は、V字形状に傾斜するシリンダ列を備える。V型エンジン3は、車両の前側に配置される前側シリンダ18と、後ろ側に配置される後側シリンダ19とを備える。V型エンジン3の吸気側はスロットルボディ(図示省略)に接続される。他方、V型エンジン3の排気側は排気管21に接続される。   The V-type engine 3 is disposed between the front wheel 6 and the rear wheel 9 when viewed in the front-rear direction of the vehicle, and is provided on the vehicle body frame 2. The V-type engine 3 includes a cylinder row inclined in a V shape. The V-type engine 3 includes a front cylinder 18 disposed on the front side of the vehicle and a rear cylinder 19 disposed on the rear side. The intake side of the V-type engine 3 is connected to a throttle body (not shown). On the other hand, the exhaust side of the V-type engine 3 is connected to the exhaust pipe 21.

排気管21は、前側シリンダ18から垂下してV型エンジン3よりも下方で車両の後方へ延びる前側排気管22と、後側シリンダ19から垂下してV型エンジン3よりも下方で車両の前方へ延び、反転して前側排気管22に合流する後側排気管23と、前側排気管22、後側排気管23から合流した排気を車両の右側面後方へ導く排気マフラー25と、を備える。   The exhaust pipe 21 hangs down from the front cylinder 18 and extends below the V-type engine 3 to the rear of the vehicle, and the exhaust pipe 21 hangs down from the rear cylinder 19 and below the V-type engine 3 to the front of the vehicle. And a rear exhaust pipe 23 that reverses and merges with the front exhaust pipe 22, and an exhaust muffler 25 that guides the exhaust gas that has joined from the front exhaust pipe 22 and the rear exhaust pipe 23 to the rear of the right side surface of the vehicle.

V型エンジン3の動力は、ドライブスプロケット(図示省略)と、チェーン(図示省略)と、ドリブンスプロケット(図示省略)とを順次に介して後輪9に伝達される。   The power of the V-type engine 3 is transmitted to the rear wheel 9 sequentially through a drive sprocket (not shown), a chain (not shown), and a driven sprocket (not shown).

ステアリング機構5はヘッドパイプ11を中心に左右へ操舵される。ステアリング機構5は、ヘッドパイプ11に回転自在に支持されるステアリングヘッド26と、ステアリングヘッド26に設けられる左右一対のフロントフォーク27と、フロントフォーク27に設けられて前輪6の上部を部分的に覆うフロントフェンダ28と、ステアリングヘッド26の頂部に設けられるハンドル29と、を備える。   The steering mechanism 5 is steered left and right around the head pipe 11. The steering mechanism 5 includes a steering head 26 rotatably supported by the head pipe 11, a pair of left and right front forks 27 provided on the steering head 26, and a front fork 27 that partially covers an upper portion of the front wheel 6. A front fender 28 and a handle 29 provided on the top of the steering head 26 are provided.

フロントフォーク27はサスペンション機構(図示省略)を内装して前輪6を接地させる。   The front fork 27 includes a suspension mechanism (not shown) to ground the front wheel 6.

後輪懸架装置7はピボット部16を中心に揺動する。後輪懸架装置7は、ピボット部16から車両の後方へ延びるスイングアーム31と、スイングアーム31の後端部に回転自在に支持される後輪9と、スイングアーム31と車体フレーム2との間に架設されるリヤクッションユニット32と、を備える。   The rear wheel suspension device 7 swings around the pivot portion 16. The rear wheel suspension device 7 includes a swing arm 31 that extends from the pivot portion 16 toward the rear of the vehicle, a rear wheel 9 that is rotatably supported by the rear end portion of the swing arm 31, and a space between the swing arm 31 and the vehicle body frame 2. And a rear cushion unit 32 installed on the vehicle.

スイングアーム31はピボット部16に揺動自在に支持される前端部を備える。   The swing arm 31 includes a front end portion that is swingably supported by the pivot portion 16.

リヤクッションユニット32は、車両の前後方向における略中央に配置されて車体フレーム2とスイングアーム31とを緩衝する。リヤクッションユニット32は、リンク機構34を介してスイングアーム31に接続される。   The rear cushion unit 32 is disposed substantially at the center in the front-rear direction of the vehicle and cushions the vehicle body frame 2 and the swing arm 31. The rear cushion unit 32 is connected to the swing arm 31 via a link mechanism 34.

さらに、自動二輪車1は、V型エンジン3の上方に配置されて車体フレーム2に支持される燃料タンク33と、燃料タンク33の後方に配置される乗員用のシート35と、シート35の下方および後方を覆うフレームカバー36と、後輪9の上部を部分的に覆うリヤフェンダ37と、を備える。   The motorcycle 1 further includes a fuel tank 33 disposed above the V-type engine 3 and supported by the vehicle body frame 2, a passenger seat 35 disposed behind the fuel tank 33, a lower portion of the seat 35, and A frame cover 36 that covers the rear and a rear fender 37 that partially covers the upper portion of the rear wheel 9 are provided.

さらにまた、自動二輪車1は車体の前部を覆う流線形のカウリング38を備える。カウリング38は、自動二輪車1の走行中の空気抵抗を低減させるとともに、走行風圧からライダーを保護する。   Furthermore, the motorcycle 1 includes a streamlined cowling 38 that covers the front of the vehicle body. The cowling 38 reduces air resistance during traveling of the motorcycle 1 and protects the rider from traveling wind pressure.

次に、V型エンジン3および排気管21について、詳細に説明する。   Next, the V-type engine 3 and the exhaust pipe 21 will be described in detail.

図3は、本発明の実施形態に係る自動二輪車の要部を示す正面図である。   FIG. 3 is a front view showing a main part of the motorcycle according to the embodiment of the present invention.

図4は、本発明の実施形態に係る自動二輪車の要部を示す左側面図である。   FIG. 4 is a left side view showing the main part of the motorcycle according to the embodiment of the present invention.

図5は、本発明の実施形態に係る自動二輪車の要部を示す右側面図である。   FIG. 5 is a right side view showing a main part of the motorcycle according to the embodiment of the present invention.

図6は、本発明の実施形態に係る自動二輪車の要部を示す背面図である。   FIG. 6 is a rear view showing a main part of the motorcycle according to the embodiment of the present invention.

図7は、本発明の実施形態に係る自動二輪車の要部を示す底面図である。   FIG. 7 is a bottom view showing a main part of the motorcycle according to the embodiment of the present invention.

図8は、本発明の実施形態に係る自動二輪車の要部を示す左側面図である。   FIG. 8 is a left side view showing a main part of the motorcycle according to the embodiment of the present invention.

図9は、本発明の実施形態に係る自動二輪車の要部を示す右側面図である。   FIG. 9 is a right side view showing the main part of the motorcycle according to the embodiment of the present invention.

図10は、本発明の実施形態に係る自動二輪車の要部を示す底面図である。   FIG. 10 is a bottom view showing a main part of the motorcycle according to the embodiment of the present invention.

なお、図8は図4から車体フレーム2を除いて示す図である。図9は図5から車体フレーム2を除いて示す図である。図10は図7から車体フレーム2を除いて示す図である。   FIG. 8 is a diagram showing the vehicle body frame 2 from FIG. FIG. 9 is a diagram showing the vehicle body frame 2 from FIG. FIG. 10 is a view showing the vehicle body frame 2 from FIG.

図3から図10に示すように、本実施形態に係る自動二輪車1は、前側シリンダ18と後側シリンダ19とを有するV型エンジン3と、前側シリンダ18の前側面から下方へ垂下してV型エンジン3よりも下方で車両の後方へ延びる前側排気管22と、後側シリンダ19の後ろ側面から下方へ垂下する垂下部41、垂下部41に連接してV型エンジン3よりも下方で車両の前方へ延び、屈曲して反転し車両の後方へ戻る後側排気管23と、前側排気管22と後側排気管23とを合流させる集合管42と、垂下部41をその長手方向へ仮想的に延長させた下方延長領域Aに対して車両側面視で重なる位置に揺動中心線Cを有し、停車する車両を直立状態で支持するセンタースタンド43と、を備える。   As shown in FIG. 3 to FIG. 10, the motorcycle 1 according to this embodiment includes a V-type engine 3 having a front cylinder 18 and a rear cylinder 19, and a V-type engine that hangs downward from the front side surface of the front cylinder 18. The vehicle is located below the V-type engine 3 so as to be connected to the front exhaust pipe 22 which extends downward from the rear side of the rear engine 19 and the hanging portion 41 which hangs downward from the rear side surface of the rear cylinder 19. The rear exhaust pipe 23 that extends forward, bends, reverses, and returns to the rear of the vehicle, the collecting pipe 42 that merges the front exhaust pipe 22 and the rear exhaust pipe 23, and the drooping portion 41 are virtually arranged in the longitudinal direction. And a center stand 43 that has a swing center line C at a position that overlaps with the downwardly extended region A that is extended in a side view in a vehicle side view, and supports the vehicle that is stopped in an upright state.

また、自動二輪車1の排気管21は、車両側面視において、下方延長領域Aの少なくとも一部に重ねて配置されるチャンバ45と、チャンバ45内に収容されてV型エンジン3の排気を浄化する触媒46と、を備える。   Further, the exhaust pipe 21 of the motorcycle 1 purifies the exhaust of the V-type engine 3 by being accommodated in the chamber 45 that is disposed so as to overlap at least a part of the lower extension region A in a side view of the vehicle. And a catalyst 46.

V型エンジン3は、4ストロークV型2気筒エンジンである。なお、これに限られずV型4気筒以上のエンジンであっても良い。   The V-type engine 3 is a 4-stroke V-type 2-cylinder engine. Note that the present invention is not limited to this, and an engine of V-type four cylinders or more may be used.

V型エンジン3は車両の幅方向(左右方向)に延びるクランクシャフト(図示省略)を収容するクランクケース51と、クランクケース51の前上部から斜め前上方に向かって延びる前側シリンダ18と、前側シリンダ18の直ぐ後部から斜め後ろ上方に向かって延びる後側シリンダ19と、クランクケース51の下部に設けられたオイルパン52と、クランクケース51の前下部に設けられたオイルフィルタ53と、を備える。   The V-type engine 3 includes a crankcase 51 that houses a crankshaft (not shown) that extends in the width direction (left-right direction) of the vehicle, a front cylinder 18 that extends obliquely upward from the front upper portion of the crankcase 51, and a front cylinder. 18, a rear cylinder 19 that extends obliquely rearward and upward from an immediately rear portion of the 18, an oil pan 52 provided at a lower portion of the crankcase 51, and an oil filter 53 provided at a front lower portion of the crankcase 51.

クランクケース51は前半部にクランクシャフトを収容し、後半部にクラッチ(図示省略)および変速機(図示省略)を収容する。   The crankcase 51 accommodates a crankshaft in the front half and a clutch (not shown) and a transmission (not shown) in the rear half.

前側シリンダ18および後側シリンダ19は、車両の側面視においてV字型に開き、それぞれクランクケース51に設けられるシリンダ本体55と、シリンダ本体55の上端を塞ぐシリンダヘッド56と、シリンダヘッド56の上端を塞ぐヘッドカバー57と、を備える。   The front cylinder 18 and the rear cylinder 19 open in a V shape in a side view of the vehicle, respectively, a cylinder body 55 provided in the crankcase 51, a cylinder head 56 that closes the upper end of the cylinder body 55, and an upper end of the cylinder head 56 And a head cover 57 for closing.

前側排気管22、後側排気管23、集合管42およびチャンバ45は、排気管21の一部で有る。排気管21は前側排気管22、後側排気管23、集合管42およびチャンバ45の他に排気マフラー25を備える。   The front exhaust pipe 22, the rear exhaust pipe 23, the collecting pipe 42, and the chamber 45 are part of the exhaust pipe 21. The exhaust pipe 21 includes an exhaust muffler 25 in addition to the front exhaust pipe 22, the rear exhaust pipe 23, the collecting pipe 42 and the chamber 45.

前側排気管22は、前側シリンダ18の排気ポートに接続し、一旦車両の前方へ張り出しつつ、屈曲しながら垂下してV型エンジン3よりも下方の領域L(以下、「下方領域L」と呼ぶ。)に到達し、下方領域Lを車両の後方へ向かって略直線的に延びて集合管42に到達する。この前側排気管22の直線部は、下方領域LのうちV型エンジン3または車体フレーム2の左側縁部の近傍に寄る。   The front exhaust pipe 22 is connected to the exhaust port of the front cylinder 18 and extends downward in front of the vehicle, hangs down while being bent, and is an area L below the V-type engine 3 (hereinafter referred to as “lower area L”). )), The lower region L extends substantially linearly toward the rear of the vehicle and reaches the collecting pipe 42. The straight portion of the front exhaust pipe 22 approaches the vicinity of the left side edge of the V-type engine 3 or the vehicle body frame 2 in the lower region L.

後側排気管23は、後輪9、スイングアーム31、サスペンション58の存在領域との兼ね合いの都合から、後側シリンダ19の排気ポートに接続し、車両の後方へ延びてV型エンジン3から遠ざかり、サスペンション58の脇に到達する位置でサスペンション58の右側に並び略真っ直ぐに垂下して、V型エンジン3の下方領域Lに到達し、下方領域Lを車両の前方へ向かって略直線的に延びつつチャンバ45の右側方に並び、チャンバ45の前端部近傍から集合管42の右側方に渡る領域でU字形状に屈曲し、反転するU字形状屈曲部59を経て集合管42に到達する。   The rear exhaust pipe 23 is connected to the exhaust port of the rear cylinder 19 for the convenience of the rear wheel 9, the swing arm 31, and the region where the suspension 58 exists, and extends rearward of the vehicle and away from the V-type engine 3. In a position that reaches the side of the suspension 58, it hangs substantially straight on the right side of the suspension 58, reaches the lower region L of the V-type engine 3, and extends substantially linearly toward the front of the vehicle in the lower region L. However, it is arranged on the right side of the chamber 45, bent in a U shape in the region extending from the vicinity of the front end of the chamber 45 to the right side of the collecting pipe 42, and reaches the collecting pipe 42 through a U-shaped bent portion 59 that is reversed.

垂下部41は、後側排気管23のうち略真っ直ぐに垂下する部分である。下方延長領域Aは、この後側排気管23のうち略真っ直ぐに垂下する部分を仮想的に延長させた領域である。本実施形態に係る垂下部41は、略真っ直ぐに垂下しているため、下方延長領域Aも略真っ直ぐに下方へ向かって延びる領域を指す。なお、垂下部41は、斜めに傾斜(例えば、斜め前下方に向かって傾斜)して垂下していても良い。この場合、下方延長領域Aは、傾斜する垂下部41を仮想的に延長させた領域である。   The drooping portion 41 is a portion that droops substantially straight in the rear exhaust pipe 23. The downward extension region A is a region obtained by virtually extending a portion of the rear exhaust pipe 23 that hangs substantially straight. Since the drooping portion 41 according to the present embodiment hangs substantially straight, the downward extension region A also refers to a region that extends substantially straight downward. In addition, the drooping part 41 may be inclined and inclined (for example, inclined diagonally forward and downward). In this case, the downward extension region A is a region in which the inclined hanging portion 41 is virtually extended.

集合管42は前側排気管22および後側排気管23に接続され、前側排気管22が案内する前側シリンダ18の排気と、後側排気管23が案内する後側シリンダ19の排気とを合流させてチャンバ45へ送り込む。   The collecting pipe 42 is connected to the front exhaust pipe 22 and the rear exhaust pipe 23, and combines the exhaust of the front cylinder 18 guided by the front exhaust pipe 22 and the exhaust of the rear cylinder 19 guided by the rear exhaust pipe 23. Into the chamber 45.

チャンバ45は、前側排気管22や後側排気管23よりも大径で短尺な円筒形状を呈し、集合管42に接続される。チャンバ45は、前側排気管22の直線部の後方にあり、下方領域LのうちV型エンジン3または車体フレーム2の左側縁部の近傍に寄る。なお、チャンバ45の右側方に並ぶ後側排気管23の直線部分とチャンバとの管径の和は、自動二輪車1のバンク角の確保の観点から、V型エンジン3または車体フレーム2の幅寸法よりも小さく、車体の側方へはみ出さないことが好ましい。   The chamber 45 has a cylindrical shape that is larger in diameter and shorter than the front exhaust pipe 22 and the rear exhaust pipe 23, and is connected to the collecting pipe 42. The chamber 45 is behind the straight portion of the front exhaust pipe 22 and approaches the vicinity of the left side edge of the V-type engine 3 or the vehicle body frame 2 in the lower region L. The sum of the tube diameters of the straight exhaust pipe 23 lined up on the right side of the chamber 45 and the chamber is the width dimension of the V-type engine 3 or the vehicle body frame 2 from the viewpoint of securing the bank angle of the motorcycle 1. It is preferable that it is smaller than the side of the vehicle body.

排気マフラー25は、チャンバ45の後端部に接続し、車両の左側部近傍から後側排気管23の垂下部41を迂回しつつ車両の右側方に至り、斜め後ろ上方に延びる。   The exhaust muffler 25 is connected to the rear end portion of the chamber 45, extends from the vicinity of the left side of the vehicle to the right side of the vehicle while bypassing the hanging portion 41 of the rear exhaust pipe 23, and extends obliquely rearward and upward.

センタースタンド43は、センターフレーム13それぞれの下端部に設けられる左右一対のブラケット61を介して車体フレーム2に支持される。センタースタンド43は、左右一対のブラケット61に設けられる軸受部62によって車両の幅方向に延びる揺動中心線C回りに揺動する。揺動中心線Cはピボット部16よりも下方側、かつ後方側に配置され、他方、サスペンション58とスイングアーム31を連結させるリンク機構よりも下方側、かつ前方側に配置される。センタースタンド43は、跳ね上げられた収納位置(図4、図5、図7から図10)と、引き下げられた展開位置(図3、図6)との間を揺動する。   The center stand 43 is supported by the vehicle body frame 2 via a pair of left and right brackets 61 provided at the lower ends of the center frames 13. The center stand 43 swings around a swing center line C extending in the width direction of the vehicle by a bearing portion 62 provided on the pair of left and right brackets 61. The swing center line C is disposed on the lower side and the rear side with respect to the pivot portion 16, and on the other hand, on the lower side and on the front side with respect to the link mechanism that connects the suspension 58 and the swing arm 31. The center stand 43 swings between a retracted storage position (FIGS. 4, 5, and 7 to 10) and a retracted deployment position (FIGS. 3 and 6).

センタースタンド43は略H文字形状を呈し、車両の幅方向に離間する左右一対の脚65、66と、左右一対の脚65、66の間に設けられてそれぞれを連結させる交差部材67と、を備える。左右一対の脚65、66は揺動中心線C側の支持端部から脚65、66の自由端部(つまり接地端部)へ向かって広がる。   The center stand 43 is substantially H-shaped, and includes a pair of left and right legs 65 and 66 that are separated in the width direction of the vehicle, and a cross member 67 that is provided between the pair of left and right legs 65 and 66 and connects the legs. Prepare. The pair of left and right legs 65 and 66 spread from the support end on the swing center line C side toward the free ends (that is, the ground contact ends) of the legs 65 and 66.

排気管21は、センタースタンド43の左右一対の脚65、66の間を通過して延びる。具体的には、後側排気管23および排気マフラー25は左右一対の脚65、66の間を通過する。チャンバ45は車両側面視において下方延長領域Aに重なりつつも揺動中心線Cよりも前方に配置される。集合管42および前側排気管22はチャンバ45よりも前方側、つまり揺動中心線Cよりも前方に存在し、後側排気管23のU字形状屈曲部59も同様である。   The exhaust pipe 21 extends between the pair of left and right legs 65 and 66 of the center stand 43. Specifically, the rear exhaust pipe 23 and the exhaust muffler 25 pass between a pair of left and right legs 65 and 66. The chamber 45 is disposed in front of the swing center line C while overlapping the downward extension region A in a side view of the vehicle. The collecting pipe 42 and the front exhaust pipe 22 are present in front of the chamber 45, that is, in front of the swing center line C, and the U-shaped bent portion 59 of the rear exhaust pipe 23 is also the same.

他方、センタースタンド43は、車両側面視において後側排気管23の下方延長領域Aに揺動中心線Cを配置することによって、U字形状屈曲部59のように車両の幅方向寸法を占有する部分を避け、左右一対の脚65、66、特に両脚の支持端部の幅を車体フレーム2の幅程度に広げることができる。   On the other hand, the center stand 43 occupies the dimension in the width direction of the vehicle like the U-shaped bent part 59 by disposing the swing center line C in the downward extension region A of the rear exhaust pipe 23 in a side view of the vehicle. By avoiding the portion, the width of the pair of left and right legs 65 and 66, particularly the support end portions of both legs, can be increased to the width of the body frame 2.

本実施形態に係る自動二輪車1は、センタースタンド43の揺動中心線Cを後側排気管23の下方延長領域Aに配置することによって、チャンバ45やU字形状屈曲部59のような車両の幅方向寸法を占有する部分を避けてセンタースタンド43の支持端部の幅を車体フレーム2の幅程度に抑えて自動二輪車1のバンク角を確保できる。他方、自動二輪車1は、チャンバ45やU字形状屈曲部59に対してセンタースタンド43との占有領域の競合を排除して、チャンバ45をより大型にしたり、U字形状屈曲部59の曲率半径を大きく確保したりすることが容易になり、排気抵抗を低減させてV型エンジン3の性能を引き出し易い。   In the motorcycle 1 according to the present embodiment, the swing center line C of the center stand 43 is disposed in the downward extension region A of the rear exhaust pipe 23, so that a vehicle such as the chamber 45 or the U-shaped bent portion 59 is provided. The bank angle of the motorcycle 1 can be secured by avoiding the portion that occupies the dimension in the width direction and suppressing the width of the support end portion of the center stand 43 to about the width of the vehicle body frame 2. On the other hand, the motorcycle 1 eliminates the competition of the occupied area with the center stand 43 with respect to the chamber 45 and the U-shaped bent portion 59 to increase the size of the chamber 45 or the radius of curvature of the U-shaped bent portion 59. It is easy to ensure a large value, and it is easy to bring out the performance of the V-type engine 3 by reducing the exhaust resistance.

また、本実施形態に係る自動二輪車1は、後側排気管23の長さを最小限に抑制することによって、従来の自動二輪車で見られる前側排気管22の長さと後側排気管23の長さとを揃えるための迂回部分を必要とせず、前側シリンダ18および後側シリンダ19の双方について最適かつ最短な排気管長を設定し易く、前側シリンダ18と後側シリンダ19との排気干渉の観点で好ましい。   In addition, the motorcycle 1 according to the present embodiment suppresses the length of the rear exhaust pipe 23 to a minimum, thereby allowing the length of the front exhaust pipe 22 and the length of the rear exhaust pipe 23 to be found in a conventional motorcycle. Therefore, it is easy to set the optimum and shortest exhaust pipe length for both the front cylinder 18 and the rear cylinder 19, which is preferable from the viewpoint of exhaust interference between the front cylinder 18 and the rear cylinder 19. .

ところで、後側排気管23を避けてセンタースタンド43の揺動中心線Cを単純に後輪9へ近づけることで、チャンバ45やU字形状屈曲部59の幅方向寸法を確保することはできる。一方、後側排気管23を避けてセンタースタンド43の揺動中心線Cを単純に後輪9へ近づけることは、センタースタンド43と後輪9との干渉、より詳しくは交差部材67と後輪9との干渉を避ける必要性を新たに生じる。交差部材67と後輪9との干渉を避けるため、センタースタンド43は交差部材67を揺動中心線Cに近づけねばならない。そうすると、センタースタンド43の自由端部(つまり接地端部)の片持ち梁状部分が長くなり、脚65、66の厚肉化や管径の大径化を図って強度、剛性を確保しなければならなくなる。しかしながら、本実施形態に係る自動二輪車1は、センタースタンド43の揺動中心線Cを後側排気管23の下方延長領域Aに配置することによって、チャンバ45やU字形状屈曲部59の幅方向寸法を確保しつつ、センタースタンド43、特に交差部材67と後輪9との離間距離を確保し易く、交差部材67をセンタースタンド43の揺動中心線Cに近づけることが可能になり、センタースタンド43の強度、剛性の確保の観点からも好ましい。   By the way, by avoiding the rear exhaust pipe 23 and simply moving the swing center line C of the center stand 43 closer to the rear wheel 9, the width direction dimensions of the chamber 45 and the U-shaped bent portion 59 can be ensured. On the other hand, avoiding the rear exhaust pipe 23 and simply bringing the swing center line C of the center stand 43 close to the rear wheel 9 is an interference between the center stand 43 and the rear wheel 9, more specifically, the cross member 67 and the rear wheel. A new need arises to avoid interference with 9. In order to avoid interference between the cross member 67 and the rear wheel 9, the center stand 43 must bring the cross member 67 close to the swing center line C. As a result, the cantilevered portion of the free end portion (that is, the ground contact end portion) of the center stand 43 becomes long, and the strength and rigidity must be ensured by increasing the thickness of the legs 65 and 66 and increasing the tube diameter. I will have to. However, in the motorcycle 1 according to the present embodiment, the swing center line C of the center stand 43 is disposed in the downward extension region A of the rear exhaust pipe 23, whereby the width direction of the chamber 45 and the U-shaped bent portion 59 is increased. While ensuring the dimensions, it is easy to ensure the separation distance between the center stand 43, particularly the cross member 67 and the rear wheel 9, and the cross member 67 can be brought close to the swing center line C of the center stand 43. 43 is preferable also from the viewpoint of securing the strength and rigidity.

さらに、本実施形態に係る自動二輪車1は、チャンバ45を下方延長領域Aの少なくとも一部に重ね、極力車両の後方に配置することによって、U字形状屈曲部59および集合管42についても、車両のより後方寄りに配置して後側排気管23の長さを最小限に抑制する。   Furthermore, in the motorcycle 1 according to the present embodiment, the chamber 45 is overlapped with at least a part of the lower extension region A and arranged at the rear of the vehicle as much as possible. The rear exhaust pipe 23 is kept to a minimum length by being arranged closer to the rear side.

さらにまた、本実施形態に係る自動二輪車1は、前側排気管22および後側排気管23の長さを最小限に抑制しつつ、チャンバ45内に触媒46を備えることによって、前側シリンダ18および後側シリンダ19の双方について触媒までの排気流路長を短くし、排気の温度降下を抑え、触媒46の還元能力をより高めることできる。   Furthermore, the motorcycle 1 according to the present embodiment includes the catalyst 46 in the chamber 45 while minimizing the lengths of the front exhaust pipe 22 and the rear exhaust pipe 23, so that the front cylinder 18 and the rear cylinder 18 are arranged. It is possible to shorten the exhaust flow path length to the catalyst for both the side cylinders 19, suppress the temperature drop of the exhaust, and further increase the reduction ability of the catalyst 46.

したがって、本発明に係る自動二輪車1によれば、センタースタンド43を備えつつ、V型エンジン3にそれぞれ接続される前側排気管22、後側排気管23のレイアウトを改善し、後側排気管23のU字形状屈曲部の曲率半径を確保し、前側シリンダ18、後側シリンダ19間で排気流路長のバランスを保ち易い。   Therefore, according to the motorcycle 1 of the present invention, the layout of the front exhaust pipe 22 and the rear exhaust pipe 23 connected to the V-type engine 3 is improved while the center stand 43 is provided, and the rear exhaust pipe 23 is improved. The radius of curvature of the U-shaped bent portion is ensured, and the balance of the exhaust flow path length between the front cylinder 18 and the rear cylinder 19 is easily maintained.

1 自動二輪車
2 車体フレーム
3 V型エンジン
5 ステアリング機構
6 前輪
7 後輪懸架装置
9 後輪
11 ヘッドパイプ
12 メインフレーム
13 センターフレーム
15 シートフレーム
16 ピボット部
18 前側シリンダ
19 後側シリンダ
21 排気管
22 前側排気管
23 後側排気管
25 排気マフラー
26 ステアリングヘッド
27 フロントフォーク
28 フロントフェンダ
29 ハンドル
31 スイングアーム
32 リヤクッションユニット
33 燃料タンク
34 リンク機構
35 シート
36 フレームカバー
37 リヤフェンダ
38 カウリング
41 垂下部
42 集合管
43 センタースタンド
45 チャンバ
46 触媒
51 クランクケース
52 オイルパン
53 オイルフィルタ
55 シリンダ本体
56 シリンダヘッド
57 ヘッドカバー
58 サスペンション
59 U字形状屈曲部
61 ブラケット
62 軸受部
65、66 脚
67 交差部材
DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 3 V-type engine 5 Steering mechanism 6 Front wheel 7 Rear wheel suspension 9 Rear wheel 11 Head pipe 12 Main frame 13 Center frame 15 Seat frame 16 Pivot part 18 Front cylinder 19 Rear cylinder 21 Exhaust pipe 22 Front side Exhaust pipe 23 Rear exhaust pipe 25 Exhaust muffler 26 Steering head 27 Front fork 28 Front fender 29 Handle 31 Swing arm 32 Rear cushion unit 33 Fuel tank 34 Link mechanism 35 Seat 36 Frame cover 37 Rear fender 38 Cowling 41 Hanging part 42 Collecting pipe 43 Center stand 45 Chamber 46 Catalyst 51 Crankcase 52 Oil pan 53 Oil filter 55 Cylinder body 56 Cylinder head 57 Head cover 58 Suspension 9 U-shaped bent portion 61 the bracket 62 bearing 65, 66 leg 67 cross member

Claims (3)

前側シリンダと後側シリンダとを有するV型エンジンと、
前記前側シリンダの前側面から下方へ垂下して前記V型エンジンよりも下方で車両の後方へ延びる前側排気管と、
前記後側シリンダの後ろ側面から下方へ垂下する垂下部、前記垂下部に連接して前記V型エンジンよりも下方で車両の前方へ延び、屈曲して反転し車両の後方へ戻る後側排気管と、
前記前側排気管と前記後側排気管とを合流させる集合管と、
前記垂下部をその長手方向へ仮想的に延長させた下方延長領域に対して車両側面視で重なる位置に揺動中心線を有し、停車する車両を直立状態で支持するセンタースタンドと、を備えることを特徴とする自動二輪車。
A V-type engine having a front cylinder and a rear cylinder;
A front exhaust pipe that hangs downward from the front side surface of the front cylinder and extends to the rear of the vehicle below the V-type engine;
A hanging portion that hangs downward from the rear side surface of the rear cylinder, a rear exhaust pipe that is connected to the hanging portion, extends forward of the vehicle below the V-type engine, bends and reverses, and returns to the rear of the vehicle. When,
A collecting pipe for joining the front exhaust pipe and the rear exhaust pipe;
A center stand having a swing center line at a position overlapping with a downward extension region in which the hanging portion is virtually extended in the longitudinal direction in a side view of the vehicle, and supporting the vehicle to be stopped in an upright state. Motorcycle characterized by that.
車両側面視において、前記下方延長領域の少なくとも一部に重ねて配置されるチャンバを備える請求項1に記載の自動二輪車。 The motorcycle according to claim 1, further comprising a chamber that is disposed so as to overlap at least a part of the downward extension region in a side view of the vehicle. 前記チャンバ内に収容されて前記V型エンジンの排気を浄化する触媒を備える請求項2に記載の自動二輪車。 The motorcycle according to claim 2, further comprising a catalyst housed in the chamber for purifying exhaust of the V-type engine.
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