JPH079187B2 - Exhaust device for parallel 4-cylinder engine - Google Patents
Exhaust device for parallel 4-cylinder engineInfo
- Publication number
- JPH079187B2 JPH079187B2 JP60122647A JP12264785A JPH079187B2 JP H079187 B2 JPH079187 B2 JP H079187B2 JP 60122647 A JP60122647 A JP 60122647A JP 12264785 A JP12264785 A JP 12264785A JP H079187 B2 JPH079187 B2 JP H079187B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- exhaust
- silencer
- cylinders
- pipe
- 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
Landscapes
- Exhaust Silencers (AREA)
- Characterised By The Charging Evacuation (AREA)
Description
【発明の詳細な説明】 〔発明の技術分野〕 本発明は自動二輪車などに搭載する並列４気筒エンジン
の排気装置に関するものである。Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an exhaust system for a parallel four-cylinder engine mounted on a motorcycle or the like.
自動二輪車に搭載した並列４気筒エンジンには、排気装
置の消音器を各気筒ごとに設けないで、２気筒分を一つ
の消音器で兼用るようにしたものがある。この場合、一
般には爆発順序が互いに連続する関係にある２気筒の排
気管を下流側で合流させ、これを一つの消音器に接続す
るようにしている。このような関係にある２気筒では、
第２図に示すように、一方（第１気筒）が吸気行程のと
き、他方（第２気筒）が排気行程になるようになってい
る。Some parallel four-cylinder engines mounted on motorcycles do not have a muffler for an exhaust system for each cylinder, but use one muffler for two cylinders. In this case, generally, the exhaust pipes of the two cylinders in which the explosion order is continuous with each other are merged on the downstream side and connected to one silencer. With the two cylinders having such a relationship,
As shown in FIG. 2, when one (first cylinder) is in the intake stroke, the other (second cylinder) is in the exhaust stroke.
ところで、上記第２気筒の排気孔から排気管へ排出され
た排気ガスは、消音器の入口において圧力波となって反
射し、再び上流側へ返ってくる現象がある。この反射し
た圧力波は、途中の合流点において２本の排気管に分流
され、吸気行程中の第１気筒側へも流れることになる。
ところが、一般に排気弁の開弁範囲と吸気弁の開弁範囲
とは、第２図に示すように上死点付近において一部オー
バラップするような関係に設定されている。そのため、
第２図にＡで示す領域のように、両気筒の排気行程がオ
ーバラップする領域においては、第１気筒側へ返ってき
た圧力波が第１気筒の燃焼室内に及び、それが吸気行程
中の吸気作用を阻害することになる。このため吸気効率
を低下し、出力が低下する原因になる。By the way, there is a phenomenon that the exhaust gas discharged from the exhaust hole of the second cylinder to the exhaust pipe is reflected as a pressure wave at the inlet of the silencer and returns to the upstream side again. This reflected pressure wave is split into two exhaust pipes at the confluence point on the way, and also flows to the first cylinder side during the intake stroke.
However, generally, the opening range of the exhaust valve and the opening range of the intake valve are set so as to partially overlap each other near the top dead center as shown in FIG. for that reason,
In the region where the exhaust strokes of both cylinders overlap, such as the region indicated by A in FIG. 2, the pressure wave returning to the first cylinder side reaches the combustion chamber of the first cylinder and during the intake stroke. Will interfere with the intake action. Therefore, the intake efficiency is reduced, which causes the output to be reduced.
本発明の目的は、上述のような問題を解消し、吸気効率
の低下を紡糸することができる並列４気筒エンジンの排
気装置を提供することにある。It is an object of the present invention to provide an exhaust system for a parallel four-cylinder engine that solves the above-mentioned problems and can spin a decrease in intake efficiency.
上記目的を達成する本発明は、第１気筒から第４気筒ま
でをこの順に横並びに配置した並列４気筒エンジンにお
いて、第１気筒と第２気筒の爆発順序を第２気筒側を遅
く互いに連結する関係にし、それぞれの排気管を下流側
で互いに合流させると共に、さらに合流点より下流側へ
排気管を延長して端部に消音器を連結した排気機構と、
第３気筒と第４気筒の爆発順序を第３気筒側を遅く互い
に連続する関係にし、それぞれの排気管を下流側で互い
に合流させると共に、さらに合流点より下流側へ排気管
を延長して端部に消音器を連結した排気機構とを設け、
かつ前記第２気筒の排気管と第３気筒の排気管とを前記
各合流点よりも上流側で互いに分岐管により連結したこ
とを特徴とするものである。The present invention that achieves the above object is a parallel four-cylinder engine in which the first to fourth cylinders are arranged side by side in this order, and the explosion order of the first cylinder and the second cylinder is connected to each other later on the second cylinder side. And an exhaust mechanism in which the respective exhaust pipes are joined together on the downstream side, the exhaust pipes are further extended to the downstream side from the confluence point, and the silencer is connected to the end portion.
The explosion order of the third cylinder and the fourth cylinder is set such that the third cylinder side is slow and continuous with each other, the respective exhaust pipes are joined to each other on the downstream side, and the exhaust pipe is further extended to the downstream side from the joining point. Provided with an exhaust mechanism that connects a silencer to the part,
Further, the exhaust pipe of the second cylinder and the exhaust pipe of the third cylinder are connected to each other by a branch pipe upstream of the respective confluence points.
このように爆発順序が互いに連続する第１気筒と第２気
筒の排気管を合流させ、そこから延長した排気管に共通
の消音器を連結した排気機構と、第３気筒と第４気筒の
組との排気管を合流させ、そこから延長した排気管に共
通の消音器に連結した排気機構とを設けたものでは、そ
れぞれの排気機構において爆発順序の遅い気筒（第２気
筒、第３気筒）側の排気ガスが消音器入口で反射した圧
力波が、それぞれの排気機構の排気管の合流点で分流し
て爆発順序の早い気筒（第１気筒、第４気筒）側に侵入
し、その吸気行程に波及することになる。In this way, the exhaust pipes of the first cylinder and the second cylinder whose explosion sequences are continuous with each other are merged, and an exhaust mechanism in which a common silencer is connected to the exhaust pipe extended from the exhaust pipe, and a combination of the third cylinder and the fourth cylinder. And the exhaust pipe connected to a common silencer is provided in the exhaust pipe extended from the exhaust pipe, and the cylinders in which the explosion order is slow in each exhaust mechanism (second cylinder, third cylinder) Side exhaust gas is reflected at the silencer inlet, splits at the confluence of the exhaust pipes of the respective exhaust mechanisms, and enters the cylinders (first cylinder, fourth cylinder) in the earlier explosion order, and the intake air It will spread to the process.
しかし、本発明は、各排気機構において爆発順序の遅い
側の排気管同士（第２気筒と第３気筒の排気管同士）
を、これら排気機構の合流点よりも上流側で互いに分岐
管により連結しているため、爆発順序の遅い気筒（第２
気筒、第３気筒）の排気ガスのエネルギを上記分岐管で
分流させることにより弱め、その下流の消音器入口で反
射する圧力波を弱くする。したがって、その弱められた
圧力波が爆発順序の早い気筒（第１気筒，第４気筒）側
の吸気行程に波及しても、その吸気効率を低減する作用
を小さくする。However, in the present invention, the exhaust pipes on the side having the later explosion order in each exhaust mechanism (the exhaust pipes of the second cylinder and the third cylinder).
Are connected to each other by a branch pipe on the upstream side of the confluence point of these exhaust mechanisms, so that the cylinders (second
The energy of the exhaust gas of the cylinder, the third cylinder) is divided by the branch pipe to weaken it, and the pressure wave reflected at the muffler inlet downstream thereof is weakened. Therefore, even if the weakened pressure wave spreads to the intake stroke on the side of the cylinder (first cylinder, fourth cylinder) in which the explosion order is early, the effect of reducing the intake efficiency is reduced.
〔実施例〕 以下、本発明を図に示す実施例により説明する。[Examples] Hereinafter, the present invention will be described with reference to Examples shown in the drawings.
第１図において、１は自動二輪車に搭載された並列４気
筒エンジンであって、第１気筒S1、第２気筒S2、第３気
筒S3、第４気筒S4の四つの気筒が設けられている。これ
ら四つの気筒の爆発順序（点火順序）は、第１気筒S1−
第２気筒S2−第４気筒S4−第３気筒S3の順になるように
設定されている。すなわち、各気筒で行われる吸気，圧
縮，爆発，排気の各行程を経時的に対比して表わすと、
次の表のようになっている。In FIG. 1, reference numeral 1 denotes a parallel four-cylinder engine mounted on a motorcycle, which is provided with four cylinders of a first cylinder S 1 , a second cylinder S 2 , a third cylinder S 3 , and a fourth cylinder S 4. Has been. Firing order of these four cylinders (ignition sequence), the first cylinder S 1 -
The second cylinder S 2, the fourth cylinder S 4, and the third cylinder S 3 are set in this order. That is, when the intake, compression, explosion, and exhaust strokes performed in each cylinder are compared with time,
It looks like the following table.
上述した第１気筒S1、第２気筒S2、第３気筒S3、第４気
筒S4の排気側には、それぞれ排気管2,3,4,5が接続され
ている。このうち、爆発順序が互いに連続する関係にあ
る第１気筒S1と第２気筒S2との排気管2,3は、その下流
側で合流し、さらに合流点６より下流側に消音器８を設
けることにより、一方の組の排気機構を構成している。
また同じく爆発順序が互いに連続する関係になる第４気
筒S4と第３気筒S3との排気管5,4は、その下流側で合流
し、さらに合流点７より下流側に消音器９を設けること
により、他方の組の排気機構を構成している。 Exhaust pipes 2, 3, 4, 5 are connected to the exhaust sides of the above-described first cylinder S 1 , second cylinder S 2 , third cylinder S 3 , and fourth cylinder S 4 , respectively. Of these, the exhaust pipes 2 and 3 of the first cylinder S 1 and the second cylinder S 2 in which the explosion order is continuous with each other merge at the downstream side thereof, and further, the silencer 8 at the downstream side of the junction point 6. Is provided, the exhaust mechanism of one set is configured.
Similarly, the exhaust pipes 5 and 4 of the fourth cylinder S 4 and the third cylinder S 3, which have the same explosion sequence, join at the downstream side thereof, and a silencer 9 is provided at the downstream side of the joining point 7. By being provided, the other set of exhaust mechanisms is configured.
上述のように構成された２組の排気機構は、それぞれ爆
発順序が他方に対し遅い関係にある第２気筒S2と第３気
筒S3の排気管3,4が、合流点6,7より上流側において分岐
管10を分岐し、互いに他方の組の排気機構に連通してい
る。また、双方の組の排気機構の消音器8,9は、その入
口部において、連通管11により互いに連通している。In the two sets of exhaust mechanisms configured as described above, the exhaust pipes 3 and 4 of the second cylinder S 2 and the third cylinder S 3 , which have a slower explosion order than the other, are connected from the confluence points 6 and 7. The branch pipe 10 is branched on the upstream side and communicates with the other set of exhaust mechanisms. Further, the mufflers 8 and 9 of the two sets of exhaust mechanisms communicate with each other through a communication pipe 11 at their inlets.
上述した排気装置によると、第１気筒S1と第２気筒S2か
らなる一方の組の排気機構では、上記表に記載したよう
に、第１気筒S1が吸気行程のとき、第２気筒S2が排気行
程になっており、第２図に図示するような関係になって
いる。According to the exhaust device described above, in the exhaust mechanism of the one set consisting of the first cylinder S 1 and the second cylinder S 2 , as described in the above table, when the first cylinder S 1 is in the intake stroke, the second cylinder S 1 S 2 is the exhaust stroke, and the relationship is as shown in FIG.
排気行程中の第２気筒S2から排出された排気ガスは、排
気管３を流れるとき、破線矢印で示すように一部が分岐
管10から分流して他方の組の排気機構の排気管４へ流
れ、残りが消音器８へ流れる。この消音器８側へ流れた
排気ガスは、消音器８の入口において圧力波となって反
射し、その反射した圧力波は合流点６において一部を吸
気行程中の第１気筒S1の排気管２側へ分流させる。第１
気筒S1へ波及する圧力波のうち、第２図にＡで示すよう
な両気筒S1,S2の排気行程が互いにオーバラップする領
域にあるときのものは、吸気行程中の第１気筒S1の燃焼
室内にまで普及するため、吸気を阻止する作用を行うこ
とになる。When the exhaust gas discharged from the second cylinder S 2 during the exhaust stroke flows through the exhaust pipe 3, a part of the exhaust gas is diverted from the branch pipe 10 as indicated by a dashed arrow, and the exhaust pipe 4 of the exhaust mechanism of the other set. To the muffler 8. The exhaust gas flowing to the muffler 8 side is reflected as a pressure wave at the inlet of the muffler 8, and the reflected pressure wave is partially exhausted from the first cylinder S 1 during the intake stroke at the confluence point 6. Divide into the tube 2 side. First
Of the pressure wave spread to the cylinders S 1, is obtained when the region in which both cylinders S 1 as shown by A in FIG. 2, the exhaust stroke of S 2 can overlap each other, the first cylinder during the intake stroke Since it spreads to the combustion chamber of S 1 , it will act to block intake air.
しかし、上記排気装置では、第２気筒S2から排出された
排気ガスが、排気管３を流れるとき、一部を分岐管10か
ら他の組の排気機構に分流させるため、消音器８に達す
る排気ガスのエネルギは、その分流された分だけ弱めら
れている。そのため、消音器８の入口で反射する圧力波
は、分岐管10を設けない従来のものに比べて十分に小さ
くなっており、第１気筒S1において吸気を阻止する作用
も小さくなる。したがって、吸気効率の低下を防止し、
出力を向上することができる。However, in the above exhaust device, when the exhaust gas discharged from the second cylinder S 2 flows through the exhaust pipe 3, a part of the exhaust gas is diverted from the branch pipe 10 to another set of exhaust mechanisms, and thus reaches the silencer 8. The energy of the exhaust gas is weakened by the divided amount. Therefore, the pressure wave reflected at the inlet of the muffler 8 is sufficiently smaller than that of the conventional one in which the branch pipe 10 is not provided, and the action of blocking intake air in the first cylinder S 1 is also small. Therefore, prevent a decrease in intake efficiency,
The output can be improved.
また、上記分岐管10から他の排気機構に分流した排気ガ
スは、この他の排気機構側の消音器９の入口で反射して
も、その圧力波が第３気筒や第４気筒の吸気行程に波及
することは勿論ない。Further, even if the exhaust gas branched from the branch pipe 10 to the other exhaust mechanism is reflected at the inlet of the silencer 9 on the side of the other exhaust mechanism, its pressure wave causes the pressure wave of the intake stroke of the third cylinder or the fourth cylinder. Of course, it does not spread.
第３気筒S3、第４気筒S4に設けた他の組の排気機構の場
合でも、爆発順序が遅い方の第３気筒S3の排気管４が、
分岐管10を介して第1,2気筒S1,S2側の排気機構へ連通す
る構成になっているので、上記と同様の吸気効率低下を
防止する作用を行うことができる。Even in the case of another set of exhaust mechanisms provided in the third cylinder S 3 and the fourth cylinder S 4 , the exhaust pipe 4 of the third cylinder S 3 whose explosion order is later is
Since it is configured to communicate with the exhaust mechanism on the side of the first and second cylinders S 1 and S 2 via the branch pipe 10, it is possible to perform the same function of preventing the intake efficiency from decreasing as described above.
また、上述した排気装置では、排気管2,3,4,5や分岐管1
0が、平面視にて上下に重なる構成にはなっていないた
め、全体をコンパクトな構成にすることができる。Further, in the exhaust device described above, the exhaust pipes 2, 3, 4, 5 and the branch pipe 1
Since 0 does not overlap vertically in a plan view, the entire structure can be made compact.
上述したように本発明の並列４気筒エンジンの排気装置
は、爆発順序が互いに連続する第１気筒と第２気筒の排
気管を合流させると共に、更に排気管を延長して共通の
消音器を連結した排気機構と、第３気筒と第４気筒の排
気管を合流させると共に、さらに排気管を延長して共通
の消音器に連結した排気機構とを設けたものであるの
で、それぞれの排気機構において爆発順序の遅い気筒
（第２気筒、第３気筒）の排気ガスが消音器入口で反射
した圧力波が、それぞれの排気機構の排気管の合流点で
爆発順序の早い気筒（第１気筒，第４気筒）側の吸気行
程に波及することになるが、各排気機構において爆発順
序の遅い側の排気管同士（第２気筒と第３気筒の排気管
同士）を、これら排気機構の合流点よりも上流側で互い
に分岐管により連結したので、爆発順序の遅い気筒（第
２気筒、第３気筒）の排気ガスを上記分岐管で分流させ
ることによりエネルギを弱めることができ、それによっ
て下流の消音器で反射する圧力波を弱くし、その反射圧
力波が爆発順序の早い気筒（第１気筒，第４気筒）側の
吸気行程に波及しても、吸気効率の低減に及ぼす影響を
小さくすることができる。As described above, in the exhaust system for a parallel four-cylinder engine of the present invention, the exhaust pipes of the first cylinder and the second cylinder whose explosion orders are continuous are joined together, and the exhaust pipes are further extended to connect a common silencer. Since the exhaust mechanism is combined with the exhaust pipes of the third cylinder and the fourth cylinder, and the exhaust pipe is further extended and connected to a common silencer, each exhaust mechanism is provided. The pressure waves reflected by the exhaust gas of the cylinders with the slower explosion order (the second cylinder and the third cylinder) at the inlet of the silencer, the cylinders with the faster explosion order (the first cylinder, the first cylinder, (4 cylinders) side intake stroke, but in each exhaust mechanism, the exhaust pipes on the side with the slower explosion order (exhaust pipes of the second cylinder and the third cylinder) from the confluence of these exhaust mechanisms. Also connected to each other by a branch pipe on the upstream side Therefore, the energy can be weakened by dividing the exhaust gas of the cylinders (second cylinder, third cylinder) having a slower explosion order by the branch pipe, thereby weakening the pressure wave reflected by the downstream silencer, Even if the reflected pressure wave propagates to the intake stroke on the side of the cylinders (first cylinder, fourth cylinder) in which the explosion order is early, the influence on the reduction of intake efficiency can be reduced.
また、上記分岐管から他の排気機構に分流した排気ガス
は、他の排気機構の消音器入口で反射しても、その圧力
波が他の排気機構における気筒の吸気行程に影響を及ぼ
すことはない。Further, even if the exhaust gas branched from the branch pipe to the other exhaust mechanism is reflected at the silencer inlet of the other exhaust mechanism, its pressure wave does not affect the intake stroke of the cylinder in the other exhaust mechanism. Absent.
第１図は本発明の実施例による自動二輪車用の多気筒エ
ンジンの排気装置の平面図、第２図は上記排気装置の第
１気筒と第２気筒の排気行程と吸気行程との関係をクラ
ンク角との関係で示す関係図である。 １……多気筒エンジン、2,3,4,5……排気管、6,7……分
岐点、8,9……消音器、10……分岐管。FIG. 1 is a plan view of an exhaust system of a multi-cylinder engine for a motorcycle according to an embodiment of the present invention, and FIG. 2 shows the relationship between the exhaust stroke and the intake stroke of the first and second cylinders of the exhaust system. It is a relationship diagram shown in relation to a corner. 1 ... Multi-cylinder engine, 2,3,4,5 ... exhaust pipe, 6,7 ... branch point, 8,9 ... silencer, 10 ... branch pipe.
Claims (1)
びに配置した並列４気筒エンジンにおいて、第１気筒と
第２気筒の爆発順序を第２気筒側を遅く互いに連続する
関係にし、それぞれの排気管を下流側で互いに合流させ
ると共に、さらに合流点より下流側へ排気管を延長して
端部に消音器を連結した排気機構と、第３気筒と第４気
筒の爆発順序を第３気筒側を遅く互いに連続する関係に
し、それぞれの排気管を下流側で互いに合流させると共
に、さらに合流点より下流側へ排気管を延長して端部に
消音器を連結した排気機構とを設け、かつ前記第２気筒
の排気管と第３気筒の排気管とを前記各合流点よりも上
流側で互いに分岐管により連結したことを特徴とする並
列４気筒エンジンの排気装置。1. In a parallel four-cylinder engine in which first to fourth cylinders are arranged side by side in this order, the explosion order of the first cylinder and the second cylinder is set such that the second cylinder side is late and continuous with each other. The exhaust pipes of the third cylinder and the fourth cylinder, and the exhaust mechanism in which the exhaust pipes are joined to each other on the downstream side, the exhaust pipes are further extended to the downstream side from the confluence point, and the silencer is connected to the end. The cylinder side is in a slow continuous relationship with each other, and each exhaust pipe merges with each other on the downstream side, and further, an exhaust mechanism is provided in which the exhaust pipe is extended to the downstream side from the confluence point and a silencer is connected to the end, An exhaust system for a parallel four-cylinder engine characterized in that the exhaust pipe of the second cylinder and the exhaust pipe of the third cylinder are connected to each other by a branch pipe upstream of the respective confluence points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60122647A JPH079187B2 (en) | 1985-06-07 | 1985-06-07 | Exhaust device for parallel 4-cylinder engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60122647A JPH079187B2 (en) | 1985-06-07 | 1985-06-07 | Exhaust device for parallel 4-cylinder engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61283722A JPS61283722A (en) | 1986-12-13 |
| JPH079187B2 true JPH079187B2 (en) | 1995-02-01 |
Family
ID=14841143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60122647A Expired - Fee Related JPH079187B2 (en) | 1985-06-07 | 1985-06-07 | Exhaust device for parallel 4-cylinder engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH079187B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10161287B2 (en) | 2016-06-20 | 2018-12-25 | Hyundai Motor Company | Exhaust pipe structure having variable confluence portion |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6193004B1 (en) * | 1999-07-29 | 2001-02-27 | Harley-Davidson Motor Company | Motorcycle exhaust system |
| DE19954689A1 (en) * | 1999-11-13 | 2001-05-23 | Porsche Ag | Multi-cylinder internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57167223U (en) * | 1981-04-16 | 1982-10-21 |
-
1985
- 1985-06-07 JP JP60122647A patent/JPH079187B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10161287B2 (en) | 2016-06-20 | 2018-12-25 | Hyundai Motor Company | Exhaust pipe structure having variable confluence portion |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61283722A (en) | 1986-12-13 |
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| LAPS | Cancellation because of no payment of annual fees |