JP2816452B2 - Motorcycle secondary air injection device - Google Patents
Motorcycle secondary air injection deviceInfo
- Publication number
- JP2816452B2 JP2816452B2 JP2072212A JP7221290A JP2816452B2 JP 2816452 B2 JP2816452 B2 JP 2816452B2 JP 2072212 A JP2072212 A JP 2072212A JP 7221290 A JP7221290 A JP 7221290A JP 2816452 B2 JP2816452 B2 JP 2816452B2
- Authority
- JP
- Japan
- Prior art keywords
- secondary air
- cylinder head
- air valve
- carburetor
- engine
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、オートバイの二次空気注入装置に関す
る。Description: TECHNICAL FIELD The present invention relates to a secondary air injection device for a motorcycle.
オートバイのエンジンは、エンジンの排気通路に二次
空気送出パイプを連結し、排気ガスの脈動負圧を利用し
て、二次空気送出パイプから排気通路に二次空気を注入
し、排気ガスを二次燃焼させて未燃成分を燃焼させ、排
気ガス中に含まれた HCやCOを酸化させて浄化するようにしている。二次空
気量をコントロールする二次空気バルブは、エンジンの
シリンダー後側の気化器付近に取付けたり、フレーム前
端のダウンチューブの前側に取付けたりしている。例え
ば、特開昭62−233413号公報、特開昭59−68514号公報
参照。In a motorcycle engine, a secondary air delivery pipe is connected to an exhaust passage of the engine, and secondary air is injected into the exhaust passage from the secondary air delivery pipe by using a pulsating negative pressure of the exhaust gas, thereby exhausting the exhaust gas. The unburned components are burned by the next combustion, and HC and CO contained in the exhaust gas are oxidized and purified. The secondary air valve that controls the amount of secondary air is installed near the carburetor behind the cylinder of the engine, or installed in front of the down tube at the front end of the frame. For example, see JP-A-62-233413 and JP-A-59-68514.
エンジンの排気通路は、フレーム前下部に搭載するエ
ンジンケースの上方に突出させたシリンダーの上に連結
するシリンダーヘッドに、前方に向けて取付けてあり、
二次空気バルブが、シリンダーヘッドの前部から離れた
位置にあるので、二次空気送出パイプが長くなり、又、
二次空気バルブが露出して見えて体裁も悪い。The exhaust passage of the engine is attached to the cylinder head connected to the cylinder protruding above the engine case mounted on the lower front of the frame, facing forward,
Since the secondary air valve is located away from the front of the cylinder head, the secondary air delivery pipe becomes longer, and
The secondary air valve is exposed and looks unsightly.
この発明は、かかる点に鑑み、二次空気バルブをエン
ジンのシリンダーヘッドの前部近くに配置して二次空気
送出パイプを短くでき、又、二次空気バルブをタンクカ
バーで被って体裁がよくできる良好な運転性を維持する
ことができるオートバイの二次空気注入装置を得ること
を目的とする。In view of the above, the present invention can shorten the secondary air delivery pipe by arranging the secondary air valve near the front of the cylinder head of the engine. An object of the present invention is to provide a secondary air injection device for a motorcycle that can maintain good driving performance.
上記目的を達成するために、この発明のオートバイの
二次空気注入装置は、フレームの前下方にエンジンを搭
載すると共に、そのエンジンに具備された上方に突出す
るシリンダヘッドの後方に気化器を配設し、前記シリン
ダヘッド及び気化器の上方に配設されるよう前記フレー
ムの前上部に燃料タンクを取付け、前記燃料タンクの一
側下部に前記シリンダヘッドより前方に位置するよう二
次空気バルブを取付けると共に、その二次空気バルブの
コントロールパイプを気化器に連結し、前記二次空気バ
ルブの二次空気送出パイプを前記シリンダーヘッドの排
気通路部分に連結し、燃料タンクに連ねて外方へと延出
するタンクカバーを設けてなり、前記タンクカバーは、
前記二次空気バルブを車幅方向外側から覆うと共に、シ
リンダヘッド及び気化器との対応部分が切欠形成される
ようにしたものである。In order to achieve the above object, a secondary air injection device for a motorcycle according to the present invention has an engine mounted on a front lower portion of a frame and a carburetor disposed behind an upwardly protruding cylinder head provided on the engine. A fuel tank is mounted on the front upper portion of the frame so as to be disposed above the cylinder head and the carburetor, and a secondary air valve is provided at a lower portion of one side of the fuel tank so as to be located forward of the cylinder head. At the same time, the control pipe of the secondary air valve is connected to the carburetor, the secondary air delivery pipe of the secondary air valve is connected to the exhaust passage of the cylinder head, and connected to the fuel tank to the outside. An extending tank cover is provided, wherein the tank cover is
The secondary air valve is covered from the outside in the vehicle width direction, and a portion corresponding to the cylinder head and the carburetor is cut out.
エンジンを運転して、気化器内に負圧が生じると、コ
ントロールパイプを通じて、二次空気バルブ内のチェッ
クバルブが開き、二次空気送出パイプが通じる。そし
て、排気通路内の、排気ガスの脈動によって、排気通路
が負圧になったときに二次空気が二次空気送出パイプか
ら排気通路内に入り、排気ガスを二次燃焼させて、排気
ガス中の未燃成分を減し、浄化する。二次空気バルブに
は、逆止弁が設けてあって、排気ガスが二次空気送出パ
イプには流れないようにしてある。二次空気バルブは、
タンクカバーで被われて見え難くしてあるため、体裁が
良い。また、タンクカバーはシリンダヘッド及び気化器
を被わないものとなっているため、シリンダヘッド及び
気化器の熱は外部へと放出されやすく、しかも、二次空
気バルブを被う部分は前方であるので、この部分の車幅
が幅広となっても運転時に乗員の邪魔になることはな
い。さらに、二次空気バルブはシリンダーヘッドの排気
通路側に近くに配設されているため、二次空気送出パイ
プを短くすることができる。When the engine is operated and a negative pressure is generated in the carburetor, the check valve in the secondary air valve is opened through the control pipe, and the secondary air delivery pipe is connected. Then, when the exhaust passage becomes negative pressure due to the pulsation of the exhaust gas in the exhaust passage, the secondary air enters the exhaust passage through the secondary air delivery pipe, and the exhaust gas is secondarily burned, and the exhaust gas is exhausted. Reduce and purify unburned components in it. The secondary air valve is provided with a check valve to prevent exhaust gas from flowing to the secondary air delivery pipe. The secondary air valve is
Because it is covered with a tank cover and is hard to see, it looks good. Further, since the tank cover does not cover the cylinder head and the carburetor, the heat of the cylinder head and the carburetor is easily released to the outside, and the portion covering the secondary air valve is in front. Therefore, even if the vehicle width in this portion becomes wide, it does not obstruct the occupant during driving. Further, since the secondary air valve is disposed near the exhaust passage side of the cylinder head, the secondary air delivery pipe can be shortened.
以下、本発明の実施例を図面によって説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
フレーム１の前上部には、燃料タンク２を中央に縦に
設けた凹みを跨がせて取付ける。そして、燃料タンク２
の一側下部のフレーム１の前部側面にブラケット３を溶
着し、このブラケット３に、二次空気バルブ４をビスに
よって締着する。燃料タンク２の側面下側には、タンク
カバー５を連ねて取付け、このタンクカバー５で、二次
空気バルブ４を被う。エンジン６は、フレーム１の前下
部に搭載し、シリンダー７が上向きに設けてあって、シ
リンダー７の上面にシリンダーヘッド８を連結してあ
る。そして、シリンダーヘッド８の後側に連結した気化
器９に、二次空気バルブ４をコントロールパイプ10で連
結する。二次空気バルブ４には、二次空気導入パイプ11
と二次空気送出パイプ12を連結し、二次空気送出パイプ
12の先端は、シリンダーヘッド８の前側の排気通路13部
分に連結する。また、前記タンクカバー５には、空気バ
ルブ４及びシリンダヘッド８に対応する部分に上方へ向
けて湾曲する切欠部5aが形成されており、この切欠部5a
によって前記空気バルブ４及びシリンダヘッド８は外部
空間へと露出している。A fuel tank 2 is mounted on the front upper portion of the frame 1 so as to straddle a recess provided vertically in the center. And fuel tank 2
A bracket 3 is welded to the front side surface of the lower frame 1 on one side, and a secondary air valve 4 is fastened to the bracket 3 with screws. A tank cover 5 is attached to the lower side of the side surface of the fuel tank 2, and the tank cover 5 covers the secondary air valve 4. The engine 6 is mounted on a lower front part of the frame 1, and a cylinder 7 is provided upward, and a cylinder head 8 is connected to an upper surface of the cylinder 7. Then, the secondary air valve 4 is connected to the vaporizer 9 connected to the rear side of the cylinder head 8 by a control pipe 10. The secondary air valve 4 has a secondary air introduction pipe 11
And the secondary air delivery pipe 12
The tip of 12 is connected to the exhaust passage 13 on the front side of the cylinder head 8. The tank cover 5 has a notch 5a which is curved upward at a portion corresponding to the air valve 4 and the cylinder head 8. The notch 5a
Thus, the air valve 4 and the cylinder head 8 are exposed to an external space.
上記構成において、気化器９内が負圧のときには、コ
ントロールパイプ10を通じて、負圧で二次空気バルブ４
が開き、排気通路13に二次空気が二次空気送出パイプ12
を通じて流入し、排気ガスが二次燃焼して浄化する。In the above configuration, when the inside of the carburetor 9 is at a negative pressure, the secondary air valve 4
Opens, and the secondary air flows into the exhaust passage 13
Through the exhaust gas, and the exhaust gas is subjected to secondary combustion and purified.
以上説明したように、この発明は、エンジンの排気通
路のあるシリンダーヘッドの前側の近くに二次空気バル
ブが位置するため、二次空気送出パイプの長さを短くで
きる。そして、二次空気バルブは、燃料タンクに連ねた
タンクカバーで被ってあるので、覗かなければ見えない
ようにできて、体裁良くできる。また、タンクカバーは
シリンダヘッド及び気化器を被わないものとなっている
ため、シリンダヘッド及び気化器の熱は外部へと放出さ
れやすく、しかも、二次空気バルブを被う部分は前方で
あるので、この部分の車幅が幅広となっても運転時に乗
員の邪魔になることはなく、良好な運転性を維持するこ
とができる。As described above, according to the present invention, since the secondary air valve is located near the front side of the cylinder head having the exhaust passage of the engine, the length of the secondary air delivery pipe can be reduced. And since the secondary air valve is covered with the tank cover connected to the fuel tank, it can be made invisible so that it can be seen only by peeping, and the appearance can be improved. Further, since the tank cover does not cover the cylinder head and the carburetor, the heat of the cylinder head and the carburetor is easily released to the outside, and the portion covering the secondary air valve is in front. Therefore, even if the vehicle width in this portion becomes wide, it does not disturb the occupant during driving, and good driving performance can be maintained.
図は本発明の一実施例を示し、第１図は二次空気バルブ
の配管を示す側面図、第２図は二次空気バルブの取付け
を示す側面図、第３図は同斜視図、第４図は全体側面図
である。 １……フレーム、２……燃料タンク、４……二次空気バ
ルブ、５……タンクカバー、６……エンジン、８……シ
リンダーヘッド、９……気化器、10……コントロールパ
イプ、12……二次空気送出パイプ、13……排気通路。FIG. 1 shows an embodiment of the present invention, FIG. 1 is a side view showing piping of a secondary air valve, FIG. 2 is a side view showing attachment of a secondary air valve, FIG. FIG. 4 is an overall side view. 1 ... frame, 2 ... fuel tank, 4 ... secondary air valve, 5 ... tank cover, 6 ... engine, 8 ... cylinder head, 9 ... carburetor, 10 ... control pipe, 12 ... … Secondary air delivery pipe, 13 …… Exhaust passage.
Claims (1)
共に、そのエンジンに具備された上方に突出するシリン
ダヘッドの後方に気化器を配設し、 前記シリンダヘッド及び気化器の上方に配設されるよう
前記フレームの前上部に燃料タンクを取付け、 前記燃料タンクの一側下部に前記シリンダヘッドより前
方に位置するよう二次空気バルブを取付けると共に、そ
の二次空気バルブのコントロールパイプを気化器に連結
し、 前記二次空気バルブの二次空気送出パイプを前記シリン
ダーヘッドの排気通路部分に連結し、 燃料タンクに連ねて外方へと延出するタンクカバーを設
けてなり、 前記タンクカバーは、前記二次空気バルブを車幅方向外
側から覆うと共に、シリンダヘッド及び気化器との対応
部分が切欠形成されていることを特徴とするオートバイ
の二次空気注入装置。An engine is mounted in front of and below a frame, and a carburetor is provided behind a cylinder head of the engine which protrudes upward, and is provided above the cylinder head and the carburetor. A fuel tank is mounted on the front upper portion of the frame so that a secondary air valve is mounted on a lower portion of one side of the fuel tank so as to be located forward of the cylinder head, and a control pipe of the secondary air valve is connected to a carburetor. Connecting a secondary air delivery pipe of the secondary air valve to an exhaust passage portion of the cylinder head, and providing a tank cover extending outwardly in connection with a fuel tank; The secondary air valve is covered from the outside in the vehicle width direction, and a portion corresponding to the cylinder head and the carburetor is notched. Secondary air injection device Tobai.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2072212A JP2816452B2 (en) | 1990-03-23 | 1990-03-23 | Motorcycle secondary air injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2072212A JP2816452B2 (en) | 1990-03-23 | 1990-03-23 | Motorcycle secondary air injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03275925A JPH03275925A (en) | 1991-12-06 |
| JP2816452B2 true JP2816452B2 (en) | 1998-10-27 |
Family
ID=13482711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2072212A Expired - Fee Related JP2816452B2 (en) | 1990-03-23 | 1990-03-23 | Motorcycle secondary air injection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2816452B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4540762B2 (en) * | 1999-01-18 | 2010-09-08 | 本田技研工業株式会社 | Saddle-type vehicle with exhaust secondary air valve |
| JP6002707B2 (en) * | 2014-03-17 | 2016-10-05 | 本田技研工業株式会社 | Canister layout structure for saddle-ride type vehicles |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59194024A (en) * | 1983-04-18 | 1984-11-02 | Honda Motor Co Ltd | Exhaust purifier of internal-combustion engine |
-
1990
- 1990-03-23 JP JP2072212A patent/JP2816452B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03275925A (en) | 1991-12-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |