JP2002309933A - Secondary air supply system for v-type engine for motorcycle - Google Patents
Secondary air supply system for v-type engine for motorcycleInfo
- Publication number
- JP2002309933A JP2002309933A JP2001115844A JP2001115844A JP2002309933A JP 2002309933 A JP2002309933 A JP 2002309933A JP 2001115844 A JP2001115844 A JP 2001115844A JP 2001115844 A JP2001115844 A JP 2001115844A JP 2002309933 A JP2002309933 A JP 2002309933A
- Authority
- JP
- Japan
- Prior art keywords
- secondary air
- air supply
- passage
- type engine
- switching valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 235000013372 meat Nutrition 0.000 claims description 5
- 238000001816 cooling Methods 0.000 description 8
- 230000010349 pulsation Effects 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動二輪車用Ｖ型
エンジンの二次空気供給装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary air supply device for a V-type engine for a motorcycle.
【０００２】[0002]
【従来の技術】従来より、自動二輪車に搭載されるＶ型
エンジンにおいて、その排気通路（排気ポート等）内に
外気を二次空気として供給することにより排気ガス中の
未燃焼成分を再燃焼させて低公害化する二次空気供給装
置として、図５および図６に示すようなものがある。2. Description of the Related Art Conventionally, in a V-type engine mounted on a motorcycle, unburned components in exhaust gas are reburned by supplying outside air as secondary air into an exhaust passage (exhaust port or the like). As a secondary air supply device that reduces pollution by means of such a device, there is a device as shown in FIGS.
【０００３】図５に示す二次空気供給装置Ａは、Ｖ型エ
ンジンの上方に二次空気切換弁１０１が設置され、ここ
から延びる２本の二次空気供給ホース１０２，１０３が
それぞれ前後のシリンダーバンクのヘッドカバー１０４
の頂部に接続されている。ヘッドカバー１０４の内部に
は各シリンダーヘッド１０５の排気ポート（非図示）に
通じる図示しない二次空気供給通路が形成されている。A secondary air supply device A shown in FIG. 5 has a secondary air switching valve 101 installed above a V-type engine, and two secondary air supply hoses 102 and 103 extending therefrom are respectively connected to front and rear cylinders. Bank head cover 104
Is connected to the top. Inside the head cover 104, a secondary air supply passage (not shown) is formed which communicates with an exhaust port (not shown) of each cylinder head 105.
【０００４】また、図６に示す二次空気供給装置Ｂは、
Ｖ型エンジンの前後のシリンダーバンクの間の側方に二
次空気切換弁１１１が設置され、ここから２本の二次空
気供給パイプ１１２，１１３がそれぞれ前後のシリンダ
ーバンクの下部側方を回るように配設されて前後の排気
ポート１１４に直結されている。二次空気供給パイプ１
１２，１１３は金属管であり、二次空気切換弁１１１と
の間が短い二次空気供給ホース１１５により接続されて
いる。A secondary air supply device B shown in FIG.
A secondary air switching valve 111 is provided on the side between the front and rear cylinder banks of the V-type engine, from which two secondary air supply pipes 112 and 113 respectively turn around the lower sides of the front and rear cylinder banks. And are directly connected to the front and rear exhaust ports 114. Secondary air supply pipe 1
Reference numerals 12 and 113 denote metal tubes which are connected to the secondary air switching valve 111 by a short secondary air supply hose 115.
【０００５】これらの二次空気供給装置Ａ，Ｂは、Ｖ型
エンジンの作動と共に吸気脈動や排気脈動を受けて二次
空気切換弁１０１，１１１が開閉し、排気脈動の合間に
生ずる負圧により外気が吸入されて二次空気として排気
ポート内に供給される。[0005] These secondary air supply devices A and B receive secondary air switching valves 101 and 111 in response to intake pulsation and exhaust pulsation in conjunction with the operation of the V-type engine, and a negative pressure generated between exhaust pulsations. Outside air is sucked and supplied as secondary air into the exhaust port.
【０００６】[0006]
【発明が解決しようとする課題】図５の二次空気供給装
置Ａの場合は、二次空気供給ホース１０２，１０３がエ
ンジンの上方に配設されるので外観的に目立ちにくく、
外観を重視する自動二輪車には好適である反面、ヘッド
カバー１０４とシリンダーヘッド１０５の内部に二次空
気供給通路を複雑な形状に形成する必要があり、加工コ
ストが掛かるばかりでなく、エンジン形式によっては適
用が不可能な場合がある。In the case of the secondary air supply device A shown in FIG. 5, since the secondary air supply hoses 102 and 103 are disposed above the engine, the secondary air supply hoses are less noticeable in appearance.
Although suitable for motorcycles that emphasize appearance, the secondary air supply passage must be formed in a complicated shape inside the head cover 104 and the cylinder head 105, which not only requires processing costs, but also depends on the engine type. Application may not be possible.
【０００７】一方、図６の二次空気供給装置Ｂの場合
は、ヘッドカバーやシリンダーヘッドの内部に二次空気
供給通路を形成する必要がないという点で幅広い種類の
エンジンに適用できる反面、２本の二次空気供給パイプ
１１２，１１３が非常に目立つために自動二輪車の外観
性が著しく損なわれてしまうという難点があり、しかも
二次空気供給パイプ１１２，１１３が長尺であることか
ら二次空気供給ホース１１５に加わる振動が大きくな
り、二次空気供給ホース１１５の耐久性が低くなりやす
いという欠点もある。On the other hand, the secondary air supply device B shown in FIG. 6 can be applied to a wide variety of engines in that there is no need to form a secondary air supply passage inside the head cover or the cylinder head. The secondary air supply pipes 112 and 113 are very conspicuous and the appearance of the motorcycle is significantly impaired. In addition, since the secondary air supply pipes 112 and 113 are long, the secondary air supply pipes 112 and 113 are long. There is also a disadvantage that the vibration applied to the supply hose 115 increases and the durability of the secondary air supply hose 115 tends to decrease.
【０００８】なお、二次空気供給通路を目立ちにくくす
る従来技術として、特開昭５４−６０６１７号公報や、
特開平７−１８０５４７号公報に記載されたものがある
が、いずれもＶバンクの間に１基の吸気装置（キャブレ
ター等）を配置したＶ型エンジンにはスペースの都合で
適用が困難である。As a conventional technique for making the secondary air supply passage less noticeable, Japanese Patent Application Laid-Open No. Sho 54-60617,
Japanese Patent Application Laid-Open No. Hei 7-180547 discloses one of them. However, it is difficult to apply them to a V-type engine in which one intake device (such as a carburetor) is arranged between V banks due to space limitations.
【０００９】本発明は、上記問題点を解決するべくなさ
れたものであり、二次空気供給通路の形成が容易である
上に外観性が良くコンパクトであり、振動や熱に対する
耐久性が高く、特にＶバンクの間に１基の吸気装置を配
置したＶ型エンジンに好適であって、冷却性が劣る後側
のシリンダーバンクの冷却を妨げることのない自動二輪
車用Ｖ型エンジンの二次空気供給装置を提供することを
目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is easy to form a secondary air supply passage, has good appearance and is compact, has high durability against vibration and heat, and Particularly suitable for a V-type engine in which one intake device is arranged between V-banks, the secondary air supply of a V-type engine for a motorcycle which does not hinder cooling of a rear cylinder bank having poor cooling performance. It is intended to provide a device.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するた
め、本発明に係る自動二輪車用Ｖ型エンジンの二次空気
供給装置は、請求項１に記載したように、車両側面視で
前後２つのシリンダーバンクがＶ形状をなし、このＶバ
ンクの間に吸気装置が配置され、Ｖバンクの車幅方向一
側に上記吸気装置のエアクリーナーが設けられて他側に
二次空気切換弁が設けられた自動二輪車用Ｖ型エンジン
の二次空気供給装置において、上記各シリンダーバンク
を構成する各シリンダーヘッドの上記吸気装置が接続さ
れる吸気ポートの外部開口部に近接した位置にそれぞれ
二次空気供給通路の通路入口を開設し、上記通路入口か
ら上記各シリンダーヘッドの内部を略車両前後方向に貫
通して排気ポートに通じるように上記二次空気供給通路
を形成し、この二次空気供給通路の通路入口と上記二次
空気切換弁との間を可撓性を有する外部通路部材で接続
したことを特徴とする。In order to achieve the above object, a secondary air supply device for a V-type engine for a motorcycle according to the present invention is provided, as described in claim 1, in two front and rear views as viewed from the side of the vehicle. The cylinder bank has a V shape, an intake device is arranged between the V banks, an air cleaner for the intake device is provided on one side in the vehicle width direction of the V bank, and a secondary air switching valve is provided on the other side. In the secondary air supply device for a V-type engine for a motorcycle, a secondary air supply passage is provided at a position close to an external opening of an intake port of each cylinder head constituting each cylinder bank to which the intake device is connected. The secondary air supply passage is formed so as to penetrate the interior of each of the cylinder heads from the passage entrance substantially in the front-rear direction of the vehicle and communicate with the exhaust port. Wherein the between the passage inlet and the secondary air switching valve in the gas supply passage is connected with the outer passage member having flexibility.
【００１１】上記の構成によれば、シリンダーヘッドの
内部に二次空気供給通路を直線状に形成できるため、二
次空気供給通路の形成を非常に容易にすることができ
る。しかも、二次空気供給通路の通路入口が二次空気切
換弁の近傍に位置するため、外部通路部材の長さを最小
限にして二次空気供給装置をコンパクトで外観性の良い
ものにできる。その上、熱源である排気ポートから離間
した位置へ外部通路部材を配設することになるため、パ
イプ材を用いずにゴムホース等の弾性部材により外部通
路部材を構成することが可能となる。また、外部通路部
材が長尺でなくなるので、外部通路部材に加わる振動が
小さくなり、振動に対する耐久性も高められる。According to the above configuration, since the secondary air supply passage can be formed linearly inside the cylinder head, the formation of the secondary air supply passage can be made very easy. Moreover, since the passage inlet of the secondary air supply passage is located near the secondary air switching valve, the length of the external passage member can be minimized, and the secondary air supply device can be made compact and have good appearance. In addition, since the external passage member is provided at a position separated from the exhaust port, which is a heat source, the external passage member can be constituted by an elastic member such as a rubber hose without using a pipe material. Further, since the external passage member is no longer long, the vibration applied to the external passage member is reduced, and the durability against the vibration is enhanced.
【００１２】また、本発明に係る自動二輪車用Ｖ型エン
ジンの二次空気供給装置は、請求項２に記載したよう
に、前記二次空気供給通路の通路入口を前記二次空気切
換弁と前記吸気ポートの外部開口部との間に位置付け
た。こうすれば、外部通路部材が短縮されて一層のコン
パクト化に繋がる。Further, in the secondary air supply device for a V-type engine for a motorcycle according to the present invention, as set forth in claim 2, a passage entrance of the secondary air supply passage is provided between the secondary air switching valve and the secondary air switching valve. It was located between the external opening of the intake port. In this case, the external passage member is shortened, which leads to further downsizing.
【００１３】さらに、本発明に係る自動二輪車用Ｖ型エ
ンジンの二次空気供給装置は、請求項３に記載したよう
に、前記二次空気供給通路を前記シリンダーヘッド内部
に形成されているウォータージャケットに隣接させて設
け、この二次空気供給通路が貫通する肉部をウォーター
ジャケットの内部側に突出させた。こうすれば、ウォー
タージャケット内を流れる冷却水により二次空気供給通
路内の二次空気が冷却され、排気ガスから伝播した熱に
よる外部通路部材および二次空気切換弁の劣化が防止さ
れる。Further, in the secondary air supply device for a V-type engine for a motorcycle according to the present invention, as described in claim 3, the water jacket having the secondary air supply passage formed inside the cylinder head. And a meat portion through which the secondary air supply passage penetrates is protruded toward the inside of the water jacket. With this configuration, the secondary air in the secondary air supply passage is cooled by the cooling water flowing in the water jacket, and the deterioration of the external passage member and the secondary air switching valve due to the heat transmitted from the exhaust gas is prevented.
【００１４】そして、本発明に係る自動二輪車用Ｖ型エ
ンジンの二次空気供給装置は、請求項４に記載したよう
に、車両側面視で前記外部通路部材を前記二次空気切換
弁の外形輪郭の内側に配置した。これにより、外部通路
部材が二次空気切換弁により隠蔽されるため、外観性が
向上する。According to a second aspect of the present invention, in the secondary air supply device for a V-type engine for a motorcycle according to the present invention, the external passage member is formed by connecting the external passage member to the outer contour of the secondary air switching valve in a side view of the vehicle. Placed inside. Thereby, since the external passage member is hidden by the secondary air switching valve, the appearance is improved.
【００１５】また、本発明に係る自動二輪車用Ｖ型エン
ジンの二次空気供給装置は、請求項５に記載したよう
に、前記二次空気切換弁を前記Ｖ型エンジンの前側のシ
リンダーバンクが後側のシリンダーバンクよりも車幅方
向外側に突出している方の側に設け、その反対側に前記
エアクリーナーを設けた。こうすれば、後側のシリンダ
ーバンク側面と二次空気切換弁との間の隙間を大きく確
保でき、車両前方からの走行風により、前後のシリンダ
ーバンクの間に滞留しがちな熱気がこの隙間から放出さ
れやすくなるため、冷却性の劣る後側のシリンダーバン
クの冷却が妨げられない。Further, in the secondary air supply device for a V-type engine for a motorcycle according to the present invention, as set forth in claim 5, the secondary air switching valve is connected to a cylinder bank on the front side of the V-type engine. The air cleaner is provided on the side protruding outward in the vehicle width direction from the side cylinder bank, and the air cleaner is provided on the opposite side. In this way, a large gap can be secured between the rear side of the cylinder bank and the secondary air switching valve, and hot air that tends to stagnate between the front and rear cylinder banks due to the traveling wind from the front of the vehicle can pass through this gap. Since it is easily released, cooling of the rear cylinder bank, which is inferior in cooling performance, is not hindered.
【００１６】[0016]
【発明の実施形態】以下、本発明の実施形態について図
面を参照しながら説明する。図１は、本発明に係る二次
空気供給装置が適用されたＶ型エンジンを搭載した自動
二輪車の一例を示す左側面図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view showing an example of a motorcycle equipped with a V-type engine to which a secondary air supply device according to the present invention is applied.
【００１７】この自動二輪車１の車体フレーム２は例え
ば鋼管製であり、その前頭部に位置するヘッドパイプ３
から左右一対のタンクレール４とダウンパイプ５が延び
ている。タンクレール４はヘッドパイプ３から浅い角度
で後斜め下方に延び、ダウンパイプ５は急角度で後斜め
下方に延びた後に後方へ湾曲し、左右一対のリヤパイプ
６を介してタンクレール４の後部に連結されている。The body frame 2 of the motorcycle 1 is made of, for example, steel pipe, and has a head pipe 3 located at a front part thereof.
A pair of left and right tank rails 4 and down pipes 5 extend from the bottom. The tank rail 4 extends rearward and obliquely downward from the head pipe 3 at a shallow angle, and the down pipe 5 extends rearward and obliquely downward at a steep angle and then curves rearward. Are linked.
【００１８】そして、ヘッドパイプ３の近傍でタンクレ
ール４とダウンパイプ５の間が左右一対の補強パイプ７
で連結され、タンクレール４の中間部と、ダウンパイプ
５およびリヤパイプ６の連結部付近との間がほぼ鉛直な
左右一対のセンターパイプ８により連結され、さらに左
右一対の各部材４，５，６，８の間が車幅方向に延びる
複数のブリッジ部材（非図示）により連結されて車体フ
レーム２が構成されている。A pair of left and right reinforcing pipes 7 is provided between the tank rail 4 and the down pipe 5 near the head pipe 3.
The middle part of the tank rail 4 and the vicinity of the connecting part of the down pipe 5 and the rear pipe 6 are connected by a pair of substantially vertical left and right center pipes 8 and a pair of right and left members 4, 5, 6, 8 are connected by a plurality of bridge members (not shown) extending in the vehicle width direction to form the vehicle body frame 2.
【００１９】車体フレーム２のヘッドパイプ３には前輪
１０を支持するフロントフォーク１１がハンドルバー１
２と共に左右回動自在に軸支される一方、センターパイ
プ８には後方に延びて後輪１３を支持するスイングアー
ム１４が上下回動自在に軸支されている。そして、タン
クレール４の上に燃料タンク１５が跨設され、その下
方、即ちタンクレール４とダウンパイプ５とセンターパ
イプ８に囲まれた部分にＶ型エンジン１６が搭載され、
その出力がスイングアーム１４の内部に設けられたシャ
フトドライブ機構により後輪１３に伝達される。また、
燃料タンク１５の後部から後輪１３の上方にかけて着座
シート１７が載置されている。A front fork 11 for supporting a front wheel 10 is provided on a head pipe 3 of a body frame 2 with a handlebar 1.
2, a swing arm 14 extending rearward and supporting a rear wheel 13 is pivotally supported on the center pipe 8 so as to be vertically rotatable. A fuel tank 15 is laid on the tank rail 4, and a V-type engine 16 is mounted below the fuel tank 15, that is, a portion surrounded by the tank rail 4, the down pipe 5, and the center pipe 8.
The output is transmitted to the rear wheel 13 by a shaft drive mechanism provided inside the swing arm 14. Also,
A seat 17 is placed from the rear of the fuel tank 15 to above the rear wheel 13.
【００２０】図２はＶ型エンジン１６の左側面図であ
り、図３は図２のＩＩＩ−ＩＩＩ矢視図であり、図４は
図３のＩＶ−ＩＶ線に沿う断面図である。このＶ型エン
ジン１６は、そのクランクケース１８の上面に前後２つ
のシリンダーバンク１９Ｆ，１９Ｒが設けられており、
これら２つのシリンダーバンク１９Ｆ，１９Ｒが車両側
面視でＶ形状をなし、クランクケース１８の内部に軸支
されたクランク軸２１が車幅方向に指向している。各シ
リンダーバンク１９Ｆ，１９Ｒは、それぞれシリンダー
ブロック２２、シリンダーヘッド２３、ヘッドカバー２
４が順に固定されて構成されている。FIG. 2 is a left side view of the V-type engine 16, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIG. 4 is a sectional view taken along the line IV-IV of FIG. The V-type engine 16 is provided with two front and rear cylinder banks 19F and 19R on the upper surface of a crankcase 18 thereof.
The two cylinder banks 19F and 19R form a V shape when viewed from the side of the vehicle, and the crankshaft 21 pivotally supported inside the crankcase 18 is directed in the vehicle width direction. Each of the cylinder banks 19F and 19R includes a cylinder block 22, a cylinder head 23, and a head cover 2 respectively.
4 are fixed in order.
【００２１】そして、前後のシリンダーバンク１９Ｆ，
１９ＲがなすＶバンクの間に図１に示すように吸気装置
として１基のキャブレター２６が設置され、このキャブ
レター２６により各シリンダーバンク１９Ｆ，１９Ｒへ
の混合気供給がなされる。キャブレター２６は、その吸
気通路（ベンチュリー通路）が略鉛直方向に指向するダ
ウンドラフト型であり、キャブレター２６と前後のシリ
ンダーヘッド２３の吸気ポート２７（図３参照）との間
が二股管状のインレットパイプ２８（図１参照）により
接続されている。The front and rear cylinder banks 19F,
As shown in FIG. 1, one carburetor 26 is installed as an intake device between the V banks formed by 19R, and the carburetor 26 supplies an air-fuel mixture to each of the cylinder banks 19F and 19R. The carburetor 26 is of a downdraft type whose intake passage (Venturi passage) is directed substantially vertically, and a bifurcated tubular inlet pipe is provided between the carburetor 26 and intake ports 27 (see FIG. 3) of the front and rear cylinder heads 23. 28 (see FIG. 1).
【００２２】各吸気ポート２７は、その外部開口部２７
ａが車両前後方向に沿って直列に配置されており、破線
で示すようにシリンダーヘッド２３の内部で二股状に分
岐して燃焼室２９（図４参照）に繋がっている。また、
各吸気ポート２７に対向して排気ポート３０が形成され
ている。排気ポート３０も吸気ポート２７と同様に二股
状に分岐して燃焼室２９に繋がっており、その外部開口
部３０ａに排気マフラー３１（図２参照）が連結され
る。Each intake port 27 has an external opening 27
a are arranged in series along the longitudinal direction of the vehicle, and are branched in a forked manner inside the cylinder head 23 as shown by a broken line, and are connected to the combustion chamber 29 (see FIG. 4). Also,
An exhaust port 30 is formed opposite to each intake port 27. The exhaust port 30 also bifurcates like the intake port 27 and is connected to the combustion chamber 29. An exhaust muffler 31 (see FIG. 2) is connected to the external opening 30a.
【００２３】また、各吸気ポート２７と排気ポート３０
は、その少なくとも一方の分岐通路同士が前後同一線上
に配列されるように形成されており、このように前後同
一線上に並ぶ分岐通路の間に点火プラグ（非図示）が配
設されている。このようなレイアウトにすることによ
り、前後のシリンダーバンク１９Ｆ，１９Ｒへの混合気
供給（吸気特性）を均一化するとともに、点火プラグに
よる着火性を良好にして前後のシリンダーバンク１９
Ｆ，１９Ｒの出力を均等化することができる。Also, each intake port 27 and exhaust port 30
Is formed such that at least one of the branch passages is arranged on the same line in the front and rear, and the ignition plug (not shown) is arranged between the branch passages arranged in the same line in the front and rear. With such a layout, the supply of the air-fuel mixture (intake characteristics) to the front and rear cylinder banks 19F and 19R is made uniform, and the ignitability by the spark plug is improved so that the front and rear cylinder banks 19F and 19R are turned on.
The outputs of F and 19R can be equalized.
【００２４】一方、前後のシリンダーバンク１９Ｆ，１
９ＲがなすＶバンクの車幅方向一側にはキャブレター２
６用の図示しないエアクリーナーが設けられ、Ｖバンク
の他側には図１〜図３に示すように二次空気切換弁３４
が設けられている。On the other hand, the front and rear cylinder banks 19F, 1
Carburetor 2 is located on one side in the vehicle width direction of the V bank formed by 9R.
6 is provided with an air cleaner (not shown) for the secondary air switching valve 34 on the other side of the V bank as shown in FIGS.
Is provided.
【００２５】Ｖ型エンジン１６は、１本のクランク軸２
１に前後２つのシリンダーバンク１９Ｆ，１９Ｒのコン
ロッド（非図示）が連結される関係上、平面視（図３参
照）で前後のシリンダーバンク１９Ｆ，１９Ｒの位置が
車幅方向にずれており、前側のシリンダーバンク１９Ｆ
が後側のシリンダーバンク１９Ｒよりも車幅方向外側
（ここでは左側）に突出している。そして、二次空気切
換弁３４はＶバンクの左側に設けられ、その反対側（右
側）に前記エアクリーナーが設けられている。The V-type engine 16 has one crankshaft 2
Because the connecting rods (not shown) of the two front and rear cylinder banks 19F and 19R are connected to 1, the positions of the front and rear cylinder banks 19F and 19R are shifted in the vehicle width direction in a plan view (see FIG. 3). Cylinder bank 19F
Protrudes outward (here, left side) from the rear cylinder bank 19R in the vehicle width direction. The secondary air switching valve 34 is provided on the left side of the V bank, and the air cleaner is provided on the opposite side (right side).
【００２６】前後のシリンダーバンク１９Ｆ，１９Ｒの
シリンダーヘッド２３内部には、各吸気ポート２７の車
幅方向片側（例えば左側）に位置するように二次空気供
給通路３５が形成されている。これらの二次空気供給通
路３５の通路入口３５ａは、各吸気ポート２７の外部開
口部２７ａに近接した位置に開設され、平面視で各通路
入口３５ａが各外部開口部２７ａと二次空気切換弁３４
との間に位置している。A secondary air supply passage 35 is formed inside the cylinder head 23 of the front and rear cylinder banks 19F and 19R so as to be located on one side (for example, the left side) of each intake port 27 in the vehicle width direction. The passage inlets 35a of these secondary air supply passages 35 are opened at positions close to the external openings 27a of the respective intake ports 27, and each passage inlet 35a is connected to each of the external openings 27a and the secondary air switching valve in plan view. 34
And is located between.
【００２７】各二次空気供給通路３５は、それぞれ通路
入口３５ａから直線的に延びて各シリンダーヘッド２３
の内部を略車両前後方向に貫通し、接続通路３６に繋が
っている。接続通路３６は各排気ポート３０に設けられ
た凹部であり、車幅方向に延びて二次空気供給通路３５
に通じている。また、図４に示すように、二次空気供給
通路３５はシリンダーヘッド２３の内部に形成されてい
るウォータージャケット３７に隣接し、二次空気供給通
路３５が貫通する肉部３８がウォータージャケット３７
の内部側に突出するようにされている。Each of the secondary air supply passages 35 extends linearly from a passage entrance 35a, and extends from each of the cylinder heads 23.
Is substantially penetrated in the front-rear direction of the vehicle, and is connected to the connection passage 36. The connection passage 36 is a concave portion provided in each exhaust port 30 and extends in the vehicle width direction to extend in the secondary air supply passage 35.
Leads to. As shown in FIG. 4, the secondary air supply passage 35 is adjacent to a water jacket 37 formed inside the cylinder head 23, and the meat portion 38 through which the secondary air supply passage 35 penetrates is formed by the water jacket 37.
So as to protrude into the inside.
【００２８】そして、各通路入口３５ａに植設されたユ
ニオン３９と二次空気切換弁３４との間が可撓性を有す
る外部通路部材である二次空気供給ホース４１，４２に
より接続されている。これらの二次空気供給ホース４
１，４２は、車両側面視（図２参照）で二次空気切換弁
３４の外形輪郭の内側に配置されている。また、二次空
気切換弁３４から延出する２本の二次空気導入ホース４
３，４４が前後のシリンダーバンク１９Ｆ，１９Ｒの間
を通って前記エアクリーナーに繋がる。The union 39 implanted at each passage inlet 35a and the secondary air switching valve 34 are connected by secondary air supply hoses 41 and 42 which are flexible external passage members. . These secondary air supply hoses 4
Reference numerals 1 and 42 are arranged inside the outer contour of the secondary air switching valve 34 in a vehicle side view (see FIG. 2). Further, two secondary air introduction hoses 4 extending from the secondary air switching valve 34 are provided.
3, 44 pass between the front and rear cylinder banks 19F, 19R and connect to the air cleaner.
【００２９】本発明に係る二次空気供給装置は、二次空
気切換弁３４と、二次空気供給通路３５（接続通路３６
およびユニオン３９を含む）と、二次空気供給ホース４
１，４２と、二次空気導入ホース４３，４４等を含んで
構成されている。The secondary air supply device according to the present invention comprises a secondary air switching valve 34 and a secondary air supply passage 35 (connection passage 36).
And the union 39), and the secondary air supply hose 4
1, 42 and secondary air introduction hoses 43, 44 and the like.
【００３０】Ｖ型エンジン１６が作動すると、主に排気
ポート３０に加わる排気脈動を受けて二次空気切換弁３
４が開閉し、排気脈動の合間に生ずる負圧により外気が
エアクリーナー→二次空気導入ホース４３，４４→二次
空気切換弁３４→二次空気供給ホース４１，４２→二次
空気供給通路３５（接続通路３６）→排気ポート３０の
順に流れて二次空気として排気ガスに混入され、排気ガ
ス中の未燃焼成分が排気マフラー３１内で再燃焼されて
排気ガスが低公害化される。When the V-type engine 16 operates, the secondary air switching valve 3 receives the exhaust pulsation mainly applied to the exhaust port 30.
4 is opened and closed, and the outside air is released by the negative pressure generated between the exhaust pulsations, the air cleaner → the secondary air introduction hoses 43 and 44 → the secondary air switching valve 34 → the secondary air supply hoses 41 and 42 → the secondary air supply passage 35. (Connection passage 36) → The exhaust gas flows in the order of the exhaust port 30 and is mixed into the exhaust gas as secondary air. Unburned components in the exhaust gas are reburned in the exhaust muffler 31, and the exhaust gas is reduced in pollution.
【００３１】本発明に係る二次空気供給装置は、その二
次空気供給通路３５の通路入口３５ａを吸気ポート２７
の外部開口部２７ａに近接して開口させ、ここから二次
空気供給通路２７をシリンダーヘッド２３の内部を略車
両前後方向に貫通して排気ポート３０に通じるように形
成したので、二次空気供給通路３５を直線状に形成可能
になっており、多大な加工コストを掛けることなく二次
空気供給通路３５を非常に容易に形成することができ
る。In the secondary air supply device according to the present invention, the passage inlet 35a of the secondary air supply passage 35 is connected to the intake port 27.
The secondary air supply passage 27 is formed so as to penetrate the interior of the cylinder head 23 substantially in the front-rear direction of the vehicle and communicate with the exhaust port 30. Since the passage 35 can be formed linearly, the secondary air supply passage 35 can be formed very easily without incurring a large processing cost.
【００３２】しかも、二次空気供給通路３５の通路入口
３５ａが二次空気切換弁３４の近傍に位置することか
ら、二次空気供給ホース４１，４２の長さを最小限にし
て二次空気供給装置をコンパクトかつ外観性の良いもの
にすることができる。したがって、このＶ型エンジン１
６のようにＶバンクの間に１基の吸気装置（キャブレタ
ー２６）を備えたＶ型エンジンには好適である。なお、
二次空気供給ホース４１，４２が高温な排気ポート３０
に直結されることがないため、熱に対する耐久性も高
い。Further, since the passage inlet 35a of the secondary air supply passage 35 is located in the vicinity of the secondary air switching valve 34, the length of the secondary air supply hoses 41 and 42 is minimized and the secondary air supply The device can be made compact and good in appearance. Therefore, this V-type engine 1
It is suitable for a V-type engine having one intake device (carburetor 26) between V banks as shown in FIG. In addition,
The secondary air supply hoses 41 and 42 have a high temperature exhaust port 30.
Since it is not directly connected to heat, it has high durability against heat.
【００３３】また、二次空気供給通路３５の通路入口３
５ａを吸気ポート２７の外部開口部２７ａと二次空気切
換弁３４との間に位置付けたため、二次空気供給ホース
４１，４２を短縮して一層のコンパクト化を図ることが
できた。これにより、二次空気供給ホース４１，４２に
伝わる振動を低減することが可能となり、耐久性が向上
する。The passage inlet 3 of the secondary air supply passage 35
Since 5a is located between the external opening 27a of the intake port 27 and the secondary air switching valve 34, the secondary air supply hoses 41 and 42 can be shortened to achieve further compactness. Thereby, the vibration transmitted to the secondary air supply hoses 41 and 42 can be reduced, and the durability is improved.
【００３４】さらに、二次空気供給通路３５をウォータ
ージャケット３７に隣接させて設け、この二次空気供給
通路３５が貫通する肉部３８をウォータージャケット３
７の内部側に突出させたため、二次空気供給通路３５内
の二次空気を介して高温な排気ガスの熱が伝播しても、
この熱がウォータージャケット３７内を流れる冷却水に
より冷却される。このため、二次空気供給ホース４１，
４２や二次空気切換弁３４の耐久性を一段と高めること
ができる。Further, a secondary air supply passage 35 is provided adjacent to the water jacket 37, and a meat portion 38 through which the secondary air supply passage 35 passes is formed by the water jacket 3.
7, the heat of the high-temperature exhaust gas propagates through the secondary air in the secondary air supply passage 35,
This heat is cooled by the cooling water flowing in the water jacket 37. For this reason, the secondary air supply hose 41,
The durability of the secondary air switching valve and the secondary air switching valve can be further enhanced.
【００３５】また、車両側面視で二次空気供給ホース４
１，４２を二次空気切換弁３４の外形輪郭の内側に配置
したことにより、二次空気供給ホース４１，４２を二次
空気切換弁３４により隠蔽して外観性をより向上させる
ことができた。Further, the secondary air supply hose 4 is viewed from the side of the vehicle.
By arranging the secondary air supply valves 41 and 42 inside the outer contour of the secondary air switching valve 34, the secondary air supply hoses 41 and 42 are concealed by the secondary air switching valve 34, so that the appearance can be further improved. .
【００３６】さらに、Ｖ型エンジン１６の前側のシリン
ダーバンク１９Ｆが後側のシリンダーバンク１９Ｒより
も車幅方向外側に突出している方の側（本実施形態では
左側）に二次空気切換弁３４を設け、その反対側にエア
クリーナーを設けたことにより、二次空気切換弁３４と
シリンダーバンク１９Ｒの側面との間の隙間（間隔）が
大きく確保され、この隙間から前後のシリンダーバンク
１９Ｆ，１９Ｒの間に滞留しがちな熱気が車両前方から
の走行風と共に放出されやすくなるため、走行風が当た
り辛く冷却性の劣る後側のシリンダーバンク１９Ｒの冷
却が妨げられることがない。Further, a secondary air switching valve 34 is provided on the side (left side in the present embodiment) on which the front cylinder bank 19F of the V-type engine 16 projects outward in the vehicle width direction from the rear cylinder bank 19R. By providing the air cleaner on the opposite side, a large gap (interval) between the secondary air switching valve 34 and the side surface of the cylinder bank 19R is ensured, and the gap between the front and rear cylinder banks 19F, 19R is secured from this gap. Since the hot air that tends to stay in between becomes easy to be released together with the traveling wind from the front of the vehicle, the cooling of the rear cylinder bank 19R, which is hard to hit by the traveling wind and has poor cooling performance, is not hindered.
【００３７】[0037]
【発明の効果】以上説明したように、本発明に係る自動
二輪車用Ｖ型エンジンの二次空気供給装置は、コンパク
トで外観性が良く、しかも二次空気供給通路の形成が容
易で製造コストが安く、熱や振動に対する耐久性も高い
ものであって、特にＶバンクの間に１基の吸気装置を配
置したＶ型エンジンに好適であり、冷却性が劣る後側の
シリンダーバンクの冷却を妨げることもない。As described above, the secondary air supply device for a V-type engine for a motorcycle according to the present invention is compact, has good external appearance, is easy to form a secondary air supply passage, and has a low manufacturing cost. It is inexpensive and has high durability against heat and vibration, and is particularly suitable for a V-type engine in which one intake device is arranged between V-banks, and prevents cooling of a rear cylinder bank having poor cooling performance. Not even.
【図１】本発明に係る二次空気供給装置が適用されたＶ
型エンジンを搭載した自動二輪車の一例を示す左側面
図。FIG. 1 shows a V to which a secondary air supply device according to the present invention is applied.
FIG. 1 is a left side view showing an example of a motorcycle equipped with a type engine.
【図２】Ｖ型エンジンの左側面図。FIG. 2 is a left side view of the V-type engine.
【図３】図２のＩＩＩ−ＩＩＩ矢視により本発明の一実
施形態を示す図。FIG. 3 is a view showing one embodiment of the present invention as viewed in the direction of arrows III-III in FIG. 2;
【図４】図３のＩＶ−ＩＶ線に沿う断面図。FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;
【図５】二次空気供給装置の従来技術を示す左側面図。FIG. 5 is a left side view showing a conventional technique of a secondary air supply device.
【図６】二次空気供給装置の従来技術を示す左側面図。FIG. 6 is a left side view showing a conventional technique of a secondary air supply device.
１ 自動二輪車 １６ Ｖ型エンジン １９Ｆ，１９Ｒ シリンダーバンク ２３ シリンダーヘッド ２６ 吸気装置としてのキャブレター ２７ 吸気ポート ２７ａ 吸気ポートの外部開口部 ３０ 排気ポート ３４ 二次空気切換弁 ３５ 二次空気供給通路 ３５ａ 二次空気供給通路の通路入口 ３７ ウォータージャケット ３８ 肉部 ４１，４２ 可撓性を有する外部通路部材である二次空
気供給ホースDESCRIPTION OF SYMBOLS 1 Motorcycle 16 V-type engine 19F, 19R Cylinder bank 23 Cylinder head 26 Carburetor as intake device 27 Intake port 27a External opening of intake port 30 Exhaust port 34 Secondary air switching valve 35 Secondary air supply passage 35a Secondary air Passage entrance of supply passage 37 Water jacket 38 Meat portion 41, 42 Secondary air supply hose which is a flexible external passage member
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０２Ｆ 1/36 Ｆ０２Ｆ 1/36 Ｚ Ｆ０２Ｍ 35/04 Ｆ０２Ｍ 35/04 Ｂ Ｆターム(参考） 3G024 AA01 AA09 AA11 BA00 CA05 DA19 EA04 FA14 3G091 AA03 AB02 AB16 BA00 BA09 BA10 BA15 BA19 BA29 BA39 HA02 HB07 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F02F 1/36 F02F 1/36 Z F02M 35/04 F02M 35/04 BF Term (Reference) 3G024 AA01 AA09 AA11 BA00 CA05 DA19 EA04 FA14 3G091 AA03 AB02 AB16 BA00 BA09 BA10 BA15 BA19 BA29 BA39 HA02 HB07
Claims (5)
クがＶ形状をなし、このＶバンクの間に吸気装置が配置
され、Ｖバンクの車幅方向一側に上記吸気装置のエアク
リーナーが設けられて他側に二次空気切換弁が設けられ
た自動二輪車用Ｖ型エンジンの二次空気供給装置におい
て、上記各シリンダーバンクを構成する各シリンダーヘ
ッドの上記吸気装置が接続される吸気ポートの外部開口
部に近接した位置にそれぞれ二次空気供給通路の通路入
口を開設し、上記通路入口から上記各シリンダーヘッド
の内部を略車両前後方向に貫通して排気ポートに通じる
ように上記二次空気供給通路を形成し、この二次空気供
給通路の通路入口と上記二次空気切換弁との間を可撓性
を有する外部通路部材で接続したことを特徴とする自動
二輪車用Ｖ型エンジンの二次空気供給装置。1. A front and rear cylinder bank having a V shape in a side view of a vehicle, an intake device disposed between the V banks, and an air cleaner for the intake device provided on one side in the vehicle width direction of the V bank. In a secondary air supply device of a V-type engine for a motorcycle, provided with a secondary air switching valve on the other side, an external opening of an intake port to which the intake device of each cylinder head constituting each cylinder bank is connected. A passage inlet of a secondary air supply passage is opened at a position close to the portion, and the inside of each of the cylinder heads penetrates from the passage entrance substantially in the front-rear direction of the vehicle and communicates with an exhaust port. A V-shaped engine for a motorcycle, characterized in that the passage inlet of the secondary air supply passage and the secondary air switching valve are connected by a flexible external passage member. Secondary air supply device.
二次空気切換弁と前記吸気ポートの外部開口部との間に
位置付けた請求項１に記載の自動二輪車用Ｖ型エンジン
の二次空気供給装置。2. A secondary V-type engine for a motorcycle according to claim 1, wherein a passage inlet of said secondary air supply passage is located between said secondary air switching valve and an external opening of said intake port. Air supply device.
ヘッド内部に形成されているウォータージャケットに隣
接させて設け、この二次空気供給通路が貫通する肉部を
ウォータージャケットの内部側に突出させた請求項１，
２に記載の自動二輪車用Ｖ型エンジンの二次空気供給装
置。3. The secondary air supply passage is provided adjacent to a water jacket formed inside the cylinder head, and a meat portion penetrated by the secondary air supply passage protrudes toward the inside of the water jacket. Claim 1,
3. The secondary air supply device for a V-type engine for a motorcycle according to 2.
次空気切換弁の外形輪郭の内側に配置した請求項１〜３
に記載の自動二輪車用Ｖ型エンジンの二次空気供給装
置。4. The vehicle according to claim 1, wherein the external passage member is disposed inside an outer contour of the secondary air switching valve in a side view of the vehicle.
The secondary air supply device for a V-type engine for a motorcycle according to Claim 1.
の前側のシリンダーバンクが後側のシリンダーバンクよ
りも車幅方向外側に突出している方の側に設け、その反
対側に前記エアクリーナーを設けた請求項１に記載の自
動二輪車用Ｖ型エンジンの二次空気供給装置。5. The secondary air switching valve is provided on a side where a front cylinder bank of the V-type engine projects outward in a vehicle width direction from a rear cylinder bank, and the air cleaner is provided on an opposite side thereof. The secondary air supply device for a V-type engine for a motorcycle according to claim 1, further comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001115844A JP4151230B2 (en) | 2001-04-13 | 2001-04-13 | Secondary air supply device for V-type engine for motorcycles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001115844A JP4151230B2 (en) | 2001-04-13 | 2001-04-13 | Secondary air supply device for V-type engine for motorcycles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002309933A true JP2002309933A (en) | 2002-10-23 |
| JP4151230B2 JP4151230B2 (en) | 2008-09-17 |
Family
ID=18966675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001115844A Expired - Fee Related JP4151230B2 (en) | 2001-04-13 | 2001-04-13 | Secondary air supply device for V-type engine for motorcycles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4151230B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1857663A2 (en) * | 2006-05-16 | 2007-11-21 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
| US8726869B2 (en) | 2004-11-18 | 2014-05-20 | S & S Cycle, Inc. | Internal combustion engine with plate-mounted cam drive system |
-
2001
- 2001-04-13 JP JP2001115844A patent/JP4151230B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8726869B2 (en) | 2004-11-18 | 2014-05-20 | S & S Cycle, Inc. | Internal combustion engine with plate-mounted cam drive system |
| US8919321B2 (en) | 2004-11-18 | 2014-12-30 | S & S Cycle, Inc. | Internal combustion engine with lubrication system |
| EP1857663A2 (en) * | 2006-05-16 | 2007-11-21 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
| EP1857663A3 (en) * | 2006-05-16 | 2009-05-27 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4151230B2 (en) | 2008-09-17 |
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