JPH01177404A - Exhaust pipe structure for two-cycle engine - Google Patents
Exhaust pipe structure for two-cycle engineInfo
- Publication number
- JPH01177404A JPH01177404A JP33344787A JP33344787A JPH01177404A JP H01177404 A JPH01177404 A JP H01177404A JP 33344787 A JP33344787 A JP 33344787A JP 33344787 A JP33344787 A JP 33344787A JP H01177404 A JPH01177404 A JP H01177404A
- Authority
- JP
- Japan
- Prior art keywords
- silencer
- lubricating oil
- pipe
- chamber
- expansion chamber
- 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.)
- Pending
Links
- 230000003584 silencer Effects 0.000 claims abstract description 30
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 15
- 239000010687 lubricating oil Substances 0.000 abstract description 24
- 230000003134 recirculating effect Effects 0.000 abstract 4
- 239000000567 combustion gas Substances 0.000 description 5
- 238000010992 reflux Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003595 mist 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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、エクスパンションチャンバーとサイレンサー
とを含んで構成される２サイクルエンジンの排気管構造
に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exhaust pipe structure for a two-stroke engine that includes an expansion chamber and a silencer.
（従来の技術）
自動二輪車等に搭載される２サイクルエンジンの排気管
構造として、従来より排気管と、２つのマフラー（すな
わち、エクスパンシコンチャンバーとしてのファースト
マフラーとサイレンサニとしてのセカンドマフラー）と
から成るものが一般的に知られている。又、２サイクル
エンジンにおいては、潤滑油はキャブレター上流に供給
されて霧状にされ、燃料混合気の流れに乗ってエンジン
内に供給されてエンジンの潤滑に供され、最終的には燃
料油とともに燃焼するものである。(Prior art) The exhaust pipe structure of a two-stroke engine installed in a motorcycle, etc. has traditionally consisted of an exhaust pipe and two mufflers (i.e., a first muffler as an expansicon chamber and a second muffler as a silencer). What it consists of is generally known. In addition, in a two-stroke engine, lubricating oil is supplied upstream of the carburetor, is atomized, is supplied into the engine along with the flow of the fuel mixture, is used for engine lubrication, and is ultimately atomized along with the fuel oil. It is something that burns.
（発明が解決しようとする問題点）
しかしながら、上記２サイクルエンジンの潤滑方式（所
謂分離給油方式）においては、実際には潤滑油がエンジ
ン燃焼室内で完全には燃焼しないで未燃のまま排気管内
に放出され、エクスパンションチャンバーな経てサイレ
ンサーに達し、ここで冷やされて凝縮し、油溜りを形式
し、やがて蒸散゛して大気に排出されるという問題点が
あった。(Problems to be Solved by the Invention) However, in the above-mentioned two-stroke engine lubrication system (so-called separate oil supply system), the lubricating oil is not completely combusted in the engine combustion chamber and remains unburned in the exhaust pipe. The problem was that the oil was released into the air, reached the expansion chamber, reached the silencer, was cooled and condensed there, formed an oil pool, and eventually evaporated and was discharged into the atmosphere.
本発明は上記問題に鑑みてなされたもので、その目的と
する処は、サイレンサー内における未燃潤滑油の蓄積を
防ぎ、以て潤滑油が未燃状態で大気に放出されるのを防
ぐようにした２サイクルエンジンの排気管構造を提供す
るにある。The present invention has been made in view of the above problems, and its purpose is to prevent the accumulation of unburned lubricating oil within the silencer, thereby preventing the lubricating oil from being released into the atmosphere in an unburned state. To provide an exhaust pipe structure for a two-stroke engine.
（問題点を解決するための手段）
上記目的を達成すべく本発明は、２サイクルエンジンの
排気管を構成するサイレンサーをエクスパンションチャ
ンバーの上流部より高位置に配し、且つサイレンサーの
最低部と前記エクスパンションチャンバーの上流部とを
還流パイプを介して連通せしめたことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention arranges a silencer constituting the exhaust pipe of a two-stroke engine at a higher position than the upstream part of the expansion chamber, and further provides It is characterized by communicating with the upstream part of the expansion chamber via a reflux pipe.
（作用）
而して、サイレンサーの最低部に溜る未燃潤滑油は重力
により還流パイプを流れて下降し、エクスパンションチ
ャンバー上流（すなわちエンジン排気ボート近傍）に戻
され、該エクスパンションチャンバー内壁を濡らして広
がり、その排気流に触れる面精を拡大する。ここでエン
ジン排気ボートより多少の酸素を含んだ燃焼ガスか炎と
共に排出され、この炎が前記未燃潤滑油を加熱し、残留
酸素と反応させてこの未燃潤滑油を燃焼せしめる。従っ
て、サイレンサー内での未燃潤滑油の蓄櫃は防がれ、且
つ該未燃潤滑油がそのまま大気に放出されるのが確実に
防止される。(Function) The unburned lubricating oil that accumulates at the lowest part of the silencer flows down the return pipe due to gravity, returns to the upstream of the expansion chamber (that is, near the engine exhaust boat), wets the inner wall of the expansion chamber, and spreads. , enlarge the face that touches the exhaust flow. Here, combustion gas containing some oxygen is discharged from the engine exhaust boat together with flame, and this flame heats the unburned lubricating oil and reacts with the residual oxygen to cause the unburned lubricating oil to burn. Therefore, unburned lubricating oil is prevented from accumulating in the silencer, and the unburned lubricating oil is reliably prevented from being released into the atmosphere as it is.
（実施例）
以下に本発明の一実施例を添付図面に基づいて説明する
。(Example) An example of the present invention will be described below based on the accompanying drawings.
図面は本発明に係わる排気管構造を具備した２サイクル
エンジンの排気系を示す概略図である。The drawing is a schematic diagram showing an exhaust system of a two-stroke engine equipped with an exhaust pipe structure according to the present invention.
図中、ｌは２サイクルエンジンであり、該エンジン１の
吸気側にはキャブレター２を途中に有した吸気管３が接
続されている。そして、該キャブレター２には図示しな
い潤滑油タンクに連通した潤滑油吐出管８が開口してい
る。In the figure, l is a two-stroke engine, and an intake pipe 3 having a carburetor 2 in the middle is connected to the intake side of the engine 1. A lubricant discharge pipe 8 is opened in the carburetor 2 and communicates with a lubricant tank (not shown).
一方、上記エンジン１の排気側には、エクスパンション
チャンバー４とその下流に位置するサイレンサー５とを
含んで構成される排気管６か接続されている。尚、上記
サイレンサー５はエクスパンションチャンバー４の上流
部４ａよ□り十分に高い位置に配されている。そして、
前記サイレンサー５の最低部５ａと前記エクスパンショ
ンチャンバー４の上流部４ａとは還流パイプ７を介して
相連通せしめられている。On the other hand, an exhaust pipe 6 including an expansion chamber 4 and a silencer 5 located downstream thereof is connected to the exhaust side of the engine 1. Incidentally, the silencer 5 is arranged at a position sufficiently higher than the upstream portion 4a of the expansion chamber 4. and,
The lowest portion 5a of the silencer 5 and the upstream portion 4a of the expansion chamber 4 are communicated with each other via a reflux pipe 7.
次に上記２サイクルエンジンの排気管構造の作用を説明
する。Next, the operation of the exhaust pipe structure of the two-stroke engine will be explained.
２サイクルエンジン１の作動に伴い新気が吸気管３内を
勢いよくエンジン１方向に吸引されて流れ、キャブレタ
ー２内で気化された燃料油と混合され所定の空燃比を有
する混合気か形成される。As the two-stroke engine 1 operates, fresh air is forcefully drawn into the intake pipe 3 in the direction of the engine 1, and is mixed with vaporized fuel oil in the carburetor 2 to form an air-fuel mixture having a predetermined air-fuel ratio. Ru.
このとき、潤滑油吐出管８により供給される潤滑油もキ
ャブレター２内で気化され、前記混合気に混入される。At this time, the lubricating oil supplied through the lubricating oil discharge pipe 8 is also vaporized within the carburetor 2 and mixed into the air-fuel mixture.
そして、この潤滑油を含んだ混合気はエンジンｌ内に吸
入されて燃焼されるが、潤滑油はエンジン１内で各部の
潤滑に供され、最終的には燃焼されて消費されるべきで
ある。ところが、実際には潤滑油の一部は未燃状態のま
まエクスパンションチャンバー４内に排出され、サイレ
ンサー５に至ると冷えて凝縮し、サイレンサー５の最低
部５ａに溜ろうとする。然るに、該サイレンサー５の最
低部５ａには還流パイプ７か開口しており、該還流パイ
プ７は前述のようにサイレンサー５よりも下方に位置す
るエクスパンションチャンバー４の上流部４ａに連通し
ているので、凝縮した未燃潤滑油はサイレンサー５の最
低部５ａより該還流パイプ７を通ってエクスパンション
チャンバー４の上流部４ａに流れ落ちる。このとき、還
流された未燃潤滑油は、エクスパンションチャンバー４
の内壁を濡らして広がり、その表面積を拡大する。そし
て、このチャンバー４の内壁に付着した未燃潤滑油はエ
ンジン１の排気ボートより噴出してくる炎を含んだ高熱
の燃焼ガスにさらされ、該燃焼ガスに多少残留している
酸素と反応して燃焼し、エクスパンションチャンバー４
とサイレンサー５を通って大気に排出される。The mixture containing this lubricating oil is then sucked into the engine 1 and burned, but the lubricating oil is used to lubricate various parts within the engine 1 and should ultimately be burned and consumed. . However, in reality, a portion of the lubricating oil is discharged into the expansion chamber 4 in an unburned state, and when it reaches the silencer 5, it cools and condenses, and tends to accumulate in the lowest part 5a of the silencer 5. However, the reflux pipe 7 is opened at the lowest part 5a of the silencer 5, and the reflux pipe 7 communicates with the upstream part 4a of the expansion chamber 4 located below the silencer 5 as described above. The condensed unburned lubricating oil flows down from the lowest part 5a of the silencer 5 through the recirculation pipe 7 to the upstream part 4a of the expansion chamber 4. At this time, the recirculated unburned lubricating oil is transferred to the expansion chamber 4.
It wets the inner walls of the body and spreads, expanding its surface area. The unburned lubricating oil adhering to the inner wall of the chamber 4 is exposed to the high-temperature combustion gas containing flames jetted out from the exhaust boat of the engine 1, and reacts with some residual oxygen in the combustion gas. The expansion chamber 4
and is discharged into the atmosphere through the silencer 5.
この結果、潤滑油はその殆どが燃焼して大気に排出され
ることとなる。As a result, most of the lubricating oil is burned and discharged into the atmosphere.
（発明の効果）
以上の説明で明らかな如く本発明によれば、未燃状態で
エンジンより押し出された霧状の潤滑油も、サイレンサ
ー内で凝縮され、サイレンサーの最低部に溜ることなく
、還流パイプを通ってエクスパンジョンチャンバーの上
流部に還流し、エンジン排気ボートより噴出する炎を含
んだ燃焼ガス中の酸素と反応して燃焼ガスと化す。斯く
て、潤滑油はサイレンサー内に溜ることなくその殆んど
が最終的には燃焼して大気に放出されることとなる。(Effects of the Invention) As is clear from the above description, according to the present invention, the mist of lubricating oil pushed out from the engine in an unburned state is condensed within the silencer, and is recirculated without accumulating at the lowest part of the silencer. It flows back through the pipe to the upstream part of the expansion chamber, and reacts with the oxygen in the flame-containing combustion gas ejected from the engine exhaust boat, turning it into combustion gas. In this way, most of the lubricating oil does not accumulate inside the silencer and is eventually burned and released into the atmosphere.
図面は本発明に係わる排気管構造を具備した２サイクル
エンジンの排気系を示す概略図である。
ｌ・・・２サイクルエンジン、４・・・エクスパンジョ
ンチャンバー、４ａ・・・エクスパンションチャンバー
上流部、５・・・サイレンサー、５ａ・・・サイレンサ
ー最低部、６・・・排気管、７・・・還流パイプ。The drawing is a schematic diagram showing an exhaust system of a two-stroke engine equipped with an exhaust pipe structure according to the present invention. l... 2-cycle engine, 4... expansion chamber, 4a... upstream part of expansion chamber, 5... silencer, 5a... lowest part of silencer, 6... exhaust pipe, 7... - Reflux pipe.
Claims (1)
構成される２サイクルエンジンの排気管構造であって、
前記サイレンサーを前記エクスパンションチャンバーの
上流部より高位置に配し、且つ該サイレンサーの最低部
と前記エクスパンションチャンバーの上流部とを還流パ
イプを介して連通せしめたことを特徴とする２サイクル
エンジンの排気管構造。A two-stroke engine exhaust pipe structure including an expansion chamber and a silencer,
An exhaust pipe for a two-stroke engine, characterized in that the silencer is disposed at a higher position than the upstream part of the expansion chamber, and the lowest part of the silencer and the upstream part of the expansion chamber are communicated via a recirculation pipe. structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33344787A JPH01177404A (en) | 1987-12-28 | 1987-12-28 | Exhaust pipe structure for two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33344787A JPH01177404A (en) | 1987-12-28 | 1987-12-28 | Exhaust pipe structure for two-cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01177404A true JPH01177404A (en) | 1989-07-13 |
Family
ID=18266198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33344787A Pending JPH01177404A (en) | 1987-12-28 | 1987-12-28 | Exhaust pipe structure for two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01177404A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10257181B3 (en) * | 2002-12-06 | 2004-07-15 | Infineon Technologies Ag | Phase locked loop with modulator |
-
1987
- 1987-12-28 JP JP33344787A patent/JPH01177404A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10257181B3 (en) * | 2002-12-06 | 2004-07-15 | Infineon Technologies Ag | Phase locked loop with modulator |
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