JPS6327053Y2 - - Google Patents
Info
- Publication number
- JPS6327053Y2 JPS6327053Y2 JP14307381U JP14307381U JPS6327053Y2 JP S6327053 Y2 JPS6327053 Y2 JP S6327053Y2 JP 14307381 U JP14307381 U JP 14307381U JP 14307381 U JP14307381 U JP 14307381U JP S6327053 Y2 JPS6327053 Y2 JP S6327053Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust pipe
- exhaust
- muffler
- expansion chamber
- face
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 230000030279 gene silencing Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 230000001743 silencing effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
Description
【考案の詳細な説明】
この考案は小型２サイクルエンジンのような内
燃機関の消音装置に関するものである。[Detailed Description of the Invention] This invention relates to a silencer for an internal combustion engine such as a small two-stroke engine.
第４図は従来の消音装置の模式図で、図中、１
はエンジンの排気管、２は排気管１の出口端面、
３は膨脹室、４は排気管であり、燃焼室（図示せ
ず）からの排ガスＥは排気管１を経て膨脹室３に
入り、その際、出口端面２において急激に膨脹し
てエネルギを失ない、消音される。 Figure 4 is a schematic diagram of a conventional silencer.
is the exhaust pipe of the engine, 2 is the exit end face of the exhaust pipe 1,
3 is an expansion chamber, and 4 is an exhaust pipe. Exhaust gas E from the combustion chamber (not shown) enters the expansion chamber 3 through the exhaust pipe 1, and at that time, it rapidly expands at the outlet end face 2 and loses energy. No, it's muted.
この種の膨脹形消音装置では、その消音特性は
主として排気管１の膨脹室３への導入長さlaおよ
び管径ｄによつて異なるもので、第５図に示すよ
うに共振周波数1，2，3については消音効果が
大きいが、***振周波数11，12，13については
消音効果が小さいという欠点があつた。 In this type of expansion type muffler, its muffling characteristics mainly depend on the introduction length la of the exhaust pipe 1 into the expansion chamber 3 and the pipe diameter d, and as shown in FIG . , 3 had a large silencing effect, but had the disadvantage that the silencing effect was small for antiresonant frequencies 11 , 12 , and 13 .
さらに、排気管１が直管であり、かつ、排気管
１の出口端面２が排気管１の軸方向５に対して直
角となつているために、出口端面２において排気
が急激に膨脹し、その際、激しい気流音を発する
とともに、出口端面２での負圧が小さくて排ガス
Ｅを吸引する効果が低く、排気効率が低下すると
いう欠点があつた。 Furthermore, since the exhaust pipe 1 is a straight pipe and the outlet end face 2 of the exhaust pipe 1 is perpendicular to the axial direction 5 of the exhaust pipe 1, the exhaust gas rapidly expands at the outlet end face 2. At that time, there were disadvantages in that intense airflow noise was generated, and the negative pressure at the outlet end face 2 was small, making the effect of suctioning the exhaust gas E low and reducing the exhaust efficiency.
この考案は上記欠点を改善するためになされた
もので、排気管１の後端部６を後方に向つて末広
がり状となし、さらにその出口端面２を排気管１
の軸方向５と直角な方向に対して傾斜させて形成
することにより、排気効率を向上させるととも
に、広い周波数範囲にわたつて優れた消音特性を
有する内燃機関の消音装置を提供することを目的
とする。 This invention was made in order to improve the above-mentioned drawbacks, and the rear end 6 of the exhaust pipe 1 is made to be flared toward the rear, and the outlet end surface 2 of the exhaust pipe 1 is expanded toward the rear.
The purpose of the present invention is to provide a muffling device for an internal combustion engine that improves exhaust efficiency and has excellent muffling characteristics over a wide frequency range by forming the muffler in a direction perpendicular to the axial direction 5 of the engine. do.
以下、この考案の実施例を図面にしたがつて説
明する。 Embodiments of this invention will be described below with reference to the drawings.
第１図において、１はマフラ本体１１内に配設
された排気管で、この排気管１はその後端部６が
後方へ向つて末広がりのテーパ形状をなし、か
つ、その出口端面２が排気管１の軸方向５と直角
な方向から所定角度θをもつて傾斜して設定され
ている。この実施例では上記所定角度θは45゜で
ある。７はマフラ本体１１内に形成された第１の
膨脹室、８は第２の膨脹室、９は第１の膨脹室７
と第２の膨脹室８とを連結する連結管、１０は２
つの膨脹室７，８を区分する隔壁である。ここ
で、燃焼室からの排ガスＥは排気管１が、第１の
膨脹室７、連結管９、第２の膨脹室８および排出
管４を経て装置外へ排出される。 In FIG. 1, reference numeral 1 denotes an exhaust pipe disposed within a muffler body 11, and the rear end 6 of this exhaust pipe 1 has a tapered shape that widens toward the rear, and the outlet end surface 2 of the exhaust pipe 1 has a tapered shape that widens toward the rear. It is set to be inclined at a predetermined angle θ from a direction perpendicular to the axial direction 5 of FIG. In this embodiment, the predetermined angle θ is 45°. 7 is a first expansion chamber formed in the muffler main body 11, 8 is a second expansion chamber, and 9 is the first expansion chamber 7.
A connecting pipe 10 connects the second expansion chamber 8 and the second expansion chamber 8.
This is a partition wall that separates the two expansion chambers 7 and 8. Here, the exhaust gas E from the combustion chamber is discharged to the outside of the apparatus through the exhaust pipe 1, the first expansion chamber 7, the connecting pipe 9, the second expansion chamber 8, and the discharge pipe 4.
第２図は、第１図に示すこの考案による消音装
置を模式的に図示したもので、排気管１の出口端
面２が軸方向５と直角な方向に対して傾斜してい
るために、後端部６の長さがlbからlcまで徐々に
変化した複数の排気管１を備えたと同様の消音特
性を有し、したがつて第５図で説明したような反
共振周波数が生じないで、全周波数域、すなわ
ち、エンジンの全回転数域にわたつて優れた消音
特性を発揮する。 FIG. 2 schematically shows the muffler according to this invention shown in FIG. It has the same silencing characteristics as having a plurality of exhaust pipes 1 in which the length of the end portion 6 gradually changes from lb to lc, and therefore the anti-resonant frequency as explained in FIG. 5 does not occur. It exhibits excellent noise reduction characteristics over the entire frequency range, that is, the entire engine speed range.
また、排気管１の出口端面２が所定角度θだけ
傾斜して設定されているから、排ガスＥは出口端
面２の上端２ａから下端２ｂへかけて、時間的に
わずかにずれながら膨脹室３内へ排出されるの
で、従来におけるように急激に膨脹することがな
く、したがつて、出口端面２における激しい気流
音の発生を緩和することができ、消音効果の増大
に寄与する。 Furthermore, since the outlet end face 2 of the exhaust pipe 1 is set to be inclined by a predetermined angle θ, the exhaust gas E flows into the expansion chamber 3 from the upper end 2a to the lower end 2b of the outlet end face 2 with a slight time lag. Since the gas is discharged to the air, it does not expand rapidly as in the conventional case, and therefore, the generation of intense airflow noise at the outlet end face 2 can be alleviated, contributing to an increase in the noise reduction effect.
第３図はこの考案の消音装置における消音量を
示すもので、第５図にみられたような消音量の極
端に小さい谷間が存在せず、優れた消音特性を示
す。 FIG. 3 shows the silencing amount in the silencing device of this invention. There is no valley where the silencing amount is extremely small as seen in FIG. 5, and the device exhibits excellent silencing characteristics.
さらに、排気管１が出口端面２に向つて末広が
りのテーパ形状となつているために、エンジンの
排気圧力が出口端面２で十分に低下し、排ガスＥ
が円滑に排気室３内へ排出されるので、排気効率
および掃気効率が向上し、エンジン出力が増大す
る。 Furthermore, since the exhaust pipe 1 has a tapered shape that widens toward the outlet end face 2, the exhaust pressure of the engine is sufficiently reduced at the outlet end face 2, and the exhaust gas E
Since the exhaust gas is smoothly discharged into the exhaust chamber 3, exhaust efficiency and scavenging efficiency are improved, and engine output is increased.
以上詳述したように、この考案によれば、消音
周波数範囲の大きい、優れた消音特性を有し、か
つ、排気効率の優れた内燃機関の消音装置を提供
することができる。 As described in detail above, according to this invention, it is possible to provide a muffling device for an internal combustion engine that has a wide muffling frequency range, excellent muffling characteristics, and excellent exhaust efficiency.
第１図にこの考案の一実施例を示す縦断面図、
第２図は第１図の模式図、第３図はこの考案の消
音装置における排気音の周波数と消音量との関係
を示す特性図、第４図は従来の消音装置の模式
図、第５図は従来の消音装置における排気音の周
波数と消音量との関係を示す特性図である。
１……排気管、２……出口端面、３……膨脹
室、５……軸方向、６……後端部、θ……所定角
度。
FIG. 1 is a longitudinal sectional view showing an embodiment of this invention.
Fig. 2 is a schematic diagram of Fig. 1, Fig. 3 is a characteristic diagram showing the relationship between the frequency of exhaust sound and the amount of silencing in the muffler of this invention, Fig. 4 is a schematic diagram of the conventional muffler, and Fig. 5 is a schematic diagram of the conventional muffler. The figure is a characteristic diagram showing the relationship between the frequency of exhaust sound and the amount of silencing in a conventional silencing device. 1... Exhaust pipe, 2... Outlet end surface, 3... Expansion chamber, 5... Axial direction, 6... Rear end, θ... Predetermined angle.
Claims (1)
て消音を行なう消音装置において、上記排気管の
後端部を後方へ向つて末広がりのテーパ状に形成
するとともに、その出口端面を排気管の軸方向と
直角な方向から所定角度傾斜させて設定したこと
を特徴とする内燃機関の消音装置。 In a noise reduction device that introduces the rear end of an engine exhaust pipe into an expansion chamber to muffle noise, the rear end of the exhaust pipe is formed into a tapered shape that widens toward the rear, and the exit end face of the exhaust pipe is formed into a tapered shape that widens toward the rear. A muffler for an internal combustion engine, characterized in that the muffler is installed at a predetermined angle from a direction perpendicular to an axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14307381U JPS5846814U (en) | 1981-09-25 | 1981-09-25 | Internal combustion engine silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14307381U JPS5846814U (en) | 1981-09-25 | 1981-09-25 | Internal combustion engine silencer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5846814U JPS5846814U (en) | 1983-03-29 |
| JPS6327053Y2 true JPS6327053Y2 (en) | 1988-07-22 |
Family
ID=29936079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14307381U Granted JPS5846814U (en) | 1981-09-25 | 1981-09-25 | Internal combustion engine silencer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5846814U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2567844B2 (en) * | 1986-07-22 | 1996-12-25 | ヤマハ発動機株式会社 | Vehicle exhaust gas silencer |
-
1981
- 1981-09-25 JP JP14307381U patent/JPS5846814U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5846814U (en) | 1983-03-29 |
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