JPS6323369B2 - - Google Patents
Info
- Publication number
- JPS6323369B2 JPS6323369B2 JP57219879A JP21987982A JPS6323369B2 JP S6323369 B2 JPS6323369 B2 JP S6323369B2 JP 57219879 A JP57219879 A JP 57219879A JP 21987982 A JP21987982 A JP 21987982A JP S6323369 B2 JPS6323369 B2 JP S6323369B2
- Authority
- JP
- Japan
- Prior art keywords
- partition wall
- section
- exhaust
- expansion
- exhaust 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
Links
- 238000005192 partition Methods 0.000 claims description 21
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
- Characterised By The Charging Evacuation (AREA)
Description
【発明の詳細な説明】
本発明は主として農作業機などの小型の２サイ
クルエンジンの排気装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an exhaust system for a small two-stroke engine such as an agricultural machine.
一般に、２サイクルエンジンでは、エンジン出
力の向上を図るために、シリンダ室内の既燃ガス
の掃気および新気の吸入に、排気管内における排
気慣性効果を利用することが知られている。すな
わち、排気開直後の高圧既燃ガスを、排気通路の
膨張部において、急激に膨張させ、それによつて
前記膨張部と、シリンダ室内との間の圧力差を大
きくし、しかしてシリンダ室内の既燃ガスを積極
的に吸い出し、新気を吸い込むことができる。 Generally, in a two-stroke engine, in order to improve engine output, it is known that the exhaust inertia effect in the exhaust pipe is used to scavenge burnt gas in the cylinder chamber and suck in fresh air. That is, the high-pressure burnt gas immediately after the exhaust is opened is rapidly expanded in the expansion section of the exhaust passage, thereby increasing the pressure difference between the expansion section and the interior of the cylinder chamber. It can actively suck out fuel gas and breathe in fresh air.
ところが、従来、排気慣性効果を利用した２サ
イクルエンジンの排気装置は、該エンジンの排気
口側より、ある長さの排気管部、拡張部、膨張
部、絞り部および消音部が順に直線的に配置され
ているため、軽自動車、自動二輪車などのエンジ
ンのように搭載スペースに余裕のある場合には適
用可能であるが、農作業機などの汎用小型エンジ
ンに対して適用が困難であり、また、重量が大き
くなるという不具合があつた。 However, conventionally, in an exhaust system for a two-stroke engine that utilizes the exhaust inertia effect, a certain length of the exhaust pipe section, expansion section, expansion section, throttle section, and muffling section are linearly arranged in order from the exhaust port side of the engine. Because of this arrangement, it can be applied to engines in light vehicles and motorcycles where there is sufficient mounting space, but it is difficult to apply it to general-purpose small engines such as agricultural machines. There was a problem with the increased weight.
因に、先行技術として、実開昭56−17314号、
実開昭56−83628号、特公昭55−47214号がある。 Incidentally, as prior art, Utility Model Application Publication No. 56-17314,
There are Utility Model No. 56-83628 and Special Publication No. 55-47214.
本発明は、かかる点に鑑み、排気慣性効果を維
持したまま小型軽量化が図れ、農作業機などの汎
用小型エンジンに対しても適用することができる
２サイクルエンジンの排気装置を提供することを
目的とする。 In view of this, an object of the present invention is to provide an exhaust system for a two-stroke engine that can be made smaller and lighter while maintaining the exhaust inertia effect, and can be applied to general-purpose small engines such as agricultural machines. shall be.
本発明は、上記目的を達成するために、箱形の
ケーシングが仕切壁にて２分割され、該仕切壁の
一側に、一端がエンジンの排気口に連通する排気
管部が形成され、該排気管部の他端が仕切壁の開
孔を通じて該仕切壁の他側の拡張部に連通され、
該拡張部の拡張下流端に、前記仕切壁の一側に形
成された膨張部、絞り部および消音部が順に接続
され、上記排気管部が螺旋形状に形成されてい
る。 In order to achieve the above object, the present invention has a box-shaped casing divided into two parts by a partition wall, and an exhaust pipe part whose one end communicates with the exhaust port of the engine is formed on one side of the partition wall. The other end of the exhaust pipe portion is communicated with the expansion portion on the other side of the partition wall through the opening in the partition wall,
An expansion section, a constriction section, and a muffling section formed on one side of the partition wall are sequentially connected to an expansion downstream end of the expansion section, and the exhaust pipe section is formed in a spiral shape.
以下、本発明の実施例を図面に沿つて説明す
る。 Embodiments of the present invention will be described below with reference to the drawings.
第１図ないし第３図において、１は箱形のケー
シングで、上側部材２と下側部材３とがガスケツ
ト（図示省略）を介して連結固定されてなる。上
側部材２には、ケーシング１の内部を上下に２分
割することになる仕切壁４が一体的に形成されて
いる。また、下側部材３には、前記仕切壁４と直
交することになる区画壁５が所定形状に一体的に
形成されている。 In FIGS. 1 to 3, reference numeral 1 denotes a box-shaped casing, in which an upper member 2 and a lower member 3 are connected and fixed via a gasket (not shown). A partition wall 4 that divides the interior of the casing 1 into upper and lower halves is integrally formed on the upper member 2. Furthermore, a partition wall 5 that is orthogonal to the partition wall 4 is integrally formed in the lower member 3 in a predetermined shape.
しかして、上下側部材２，３が連結固定されて
なるケーシング１内には、仕切壁４の一側（下
側）に、一端がエンジン（図示省略）の排気口に
連通する排気管部６が外側から内側へ向つて螺旋
形状に形成されている。この排気管部６の他端で
ある中央端部は、仕切壁４に開設した長円状の開
孔４ａを通じて、該仕切壁４の他側に形成された
拡張部７に連通されている。なお、拡張部７は、
前記排気管部６の中央端部が連通される上流端７
ａから、通路断面積が徐々に増大して拡張下流端
７ｂとなつている。 In the casing 1 in which the upper and lower members 2 and 3 are connected and fixed, there is an exhaust pipe section 6 on one side (lower side) of the partition wall 4, one end of which communicates with the exhaust port of the engine (not shown). is formed in a spiral shape from the outside to the inside. The central end, which is the other end of the exhaust pipe section 6, communicates with an expanded section 7 formed on the other side of the partition wall 4 through an oblong opening 4a formed in the partition wall 4. In addition, the extension part 7 is
an upstream end 7 with which the central end of the exhaust pipe section 6 communicates;
The cross-sectional area of the passage gradually increases from a to an expanded downstream end 7b.
拡張部７の拡張下流端７ｂは、仕切壁４に開設
した半円状の開孔４ａを通じて、前記仕切壁４の
一側に形成された断面ほぼ半円状の膨張部８に通
じている。 The expanded downstream end 7b of the expanded portion 7 communicates through a semicircular opening 4a formed in the partition wall 4 to an expanded portion 8 formed on one side of the partition wall 4 and having a substantially semicircular cross section.
膨張部８は、該膨張部８と排気管部６の上流端
部付近との間において、絞り部９および消音部１
０に順に接続されている。 The expansion section 8 has a constriction section 9 and a muffling section 1 between the expansion section 8 and the vicinity of the upstream end of the exhaust pipe section 6.
0 in turn.
上記のように構成すれば、排気開直後の高圧既
燃ガスを急激に膨張させ、膨張部８とエンジンの
シリンダ室内との圧力差を大きくし、それによつ
て前記シリンダ室内の既燃ガスを積極的に吸い出
し、新気を吸い込むという排気慣性効果が発揮さ
れるので、エンジン出力の飛躍的な向上が図れる
ことになる。 With the above configuration, the high-pressure burnt gas immediately after the exhaust is opened is rapidly expanded, the pressure difference between the expansion part 8 and the cylinder chamber of the engine is increased, and the burnt gas in the cylinder chamber is thereby actively expanded. Since the exhaust inertia effect of sucking fresh air out and sucking in fresh air is exerted, engine output can be dramatically improved.
なお、第１図および第２図に示す実施例では、
板金またはアルミ鋳物にて製造可能であるが、ケ
ーシング１を構成する上側部材を、第４図ａ、ｂ
および第５図に示すように、別体である外壁部材
１１と仕切壁部材１２とを組合せて構成するよう
にすれば、全ての部材３，１１，１２がアルミダ
イカスト鋳物で製造可能となり、大量生産とコス
トダウンが図れる。 In addition, in the embodiment shown in FIGS. 1 and 2,
Although it can be manufactured from sheet metal or aluminum casting, the upper member constituting the casing 1 is shown in Figs. 4a and b.
As shown in FIG. 5, if the outer wall member 11 and the partition wall member 12 are constructed in combination, all the members 3, 11, 12 can be manufactured by aluminum die casting, and large quantities can be manufactured. Production and cost reduction can be achieved.
本発明は上記のように構成したから、排気慣性
効果を維持したまま小型軽量化が図れ、農作業機
などの汎用小型エンジンに対しても適用すること
ができるという実用上優れた効果を有する。 Since the present invention is constructed as described above, it can be made smaller and lighter while maintaining the exhaust inertia effect, and has excellent practical effects in that it can be applied to general-purpose small engines such as agricultural machines.
図面は本発明の実施態様を例示するもので、第
１図は２サイクルエンジンの排気装置の縦断面
図、第２図は第１図の−線における下側部材
の断面図、第３図は上側部材の平面図、第４図ａ
は外壁部材の平面図、第４図ｂは第４図ａにおけ
るＡ−Ａ線に沿う断面図、第５図は仕切壁部材の
平面図である。
１……ケーシング、４……仕切壁、４ａ，４ｂ
……開孔、６……排気管部、７……拡張部、７ａ
……上流端、７ｂ……拡張下流端、８……膨張
部、９……絞り部、１０……消音部。
The drawings illustrate embodiments of the present invention, and FIG. 1 is a longitudinal cross-sectional view of an exhaust system for a two-stroke engine, FIG. 2 is a cross-sectional view of the lower member taken along the line - in FIG. 1, and FIG. Top view of the upper member, Figure 4a
4b is a sectional view taken along line A-A in FIG. 4a, and FIG. 5 is a plan view of the partition wall member. 1... Casing, 4... Partition wall, 4a, 4b
...Opening hole, 6...Exhaust pipe section, 7...Expansion section, 7a
...Upstream end, 7b... Expansion downstream end, 8... Expansion section, 9... Throttle section, 10... Silence section.
Claims (1)
該仕切壁の一側に、一端がエンジンの排気口に連
通する排気管部が形成され、該排気管部の他端が
仕切壁の開孔を通じて該仕切壁の他側の拡張部に
連通され、該拡張部の拡張下流端に、前記仕切壁
の一側に形成された膨張部、絞り部および消音部
が順に接続され、上記排気管部が螺旋形状に形成
されていることを特徴とする２サイクルエンジン
の排気装置。1 The box-shaped casing is divided into two by a partition wall,
An exhaust pipe portion is formed on one side of the partition wall, one end of which communicates with an exhaust port of the engine, and the other end of the exhaust pipe portion communicates with an expanded portion on the other side of the partition wall through an opening in the partition wall. , an expansion part, a constriction part, and a muffling part formed on one side of the partition wall are sequentially connected to the expansion downstream end of the expansion part, and the exhaust pipe part is formed in a spiral shape. 2-cycle engine exhaust system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21987982A JPS59108815A (en) | 1982-12-14 | 1982-12-14 | Exhauster for two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21987982A JPS59108815A (en) | 1982-12-14 | 1982-12-14 | Exhauster for two-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59108815A JPS59108815A (en) | 1984-06-23 |
| JPS6323369B2 true JPS6323369B2 (en) | 1988-05-16 |
Family
ID=16742484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21987982A Granted JPS59108815A (en) | 1982-12-14 | 1982-12-14 | Exhauster for two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59108815A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0614028Y2 (en) * | 1988-09-30 | 1994-04-13 | 三菱重工業株式会社 | Silencer |
| JP2539675Y2 (en) * | 1990-03-16 | 1997-06-25 | 三菱重工業株式会社 | Muffler pipe structure |
| IT1306539B1 (en) * | 1998-04-03 | 2001-06-11 | Polini Motori S P A | EXHAUST MUFFLER FOR INTERNAL COMBUSTION ENGINES |
| DE10239132B4 (en) * | 2002-08-27 | 2012-11-15 | Andreas Stihl Ag & Co | exhaust silencer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4842218A (en) * | 1971-10-02 | 1973-06-20 | ||
| JPS4867635A (en) * | 1971-12-17 | 1973-09-14 |
-
1982
- 1982-12-14 JP JP21987982A patent/JPS59108815A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4842218A (en) * | 1971-10-02 | 1973-06-20 | ||
| JPS4867635A (en) * | 1971-12-17 | 1973-09-14 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59108815A (en) | 1984-06-23 |
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