JPH072970Y2 - Muffler device - Google Patents
Muffler deviceInfo
- Publication number
- JPH072970Y2 JPH072970Y2 JP1988147150U JP14715088U JPH072970Y2 JP H072970 Y2 JPH072970 Y2 JP H072970Y2 JP 1988147150 U JP1988147150 U JP 1988147150U JP 14715088 U JP14715088 U JP 14715088U JP H072970 Y2 JPH072970 Y2 JP H072970Y2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- exhaust gas
- exhaust
- resonance
- muffler
- 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 - Lifetime
Links
Landscapes
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Exhaust Silencers (AREA)
- Characterised By The Charging Evacuation (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は、パワーショベル等作業車両のエンジン用に好
適なマフラ装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a muffler device suitable for an engine of a work vehicle such as a power shovel.
（従来の技術） パワーショベル等の作業用車両は、住宅地や商業地内
で、又はこれらに隣接する地域で長時間に亘り作業に従
事することが多いので、エンジンの排気騒音の低減が要
望されている。従来、エンジンの排気騒音を低減するた
めに、通常各１個以上の拡散室及び共鳴室を筒状のケー
シング内に形成したマフラが広く使用されているが、必
ずしも十分な排気騒音低減効果が得られていない。(Prior Art) Work vehicles such as power shovels are often engaged in work for a long time in a residential area, a commercial area, or an area adjacent to these areas, and therefore reduction of engine exhaust noise is required. ing. Conventionally, in order to reduce engine exhaust noise, a muffler in which at least one diffusion chamber and one resonance chamber are formed in a cylindrical casing has been widely used, but a sufficient exhaust noise reduction effect is not always obtained. Has not been done.
（考案が解決しようとする課題） 上記マフラの排気騒音低減効果を向上するためには、マ
フラ内部に従来より多くの拡散室及び共鳴室を設ければ
良いのであるが、拡散室及び共鳴室の増加と共に構造が
著しく複雑になって高価となり、また大型化して広い搭
載スペースが必要になる等の不具合があり、更に排気抵
抗が増大してエンジンの出力，燃費等の性能悪化を招く
不都合がある。(Problems to be solved by the invention) In order to improve the exhaust noise reduction effect of the muffler, it is sufficient to provide more diffusion chambers and resonance chambers in the muffler than in the conventional case. There is a problem that the structure becomes significantly complicated and expensive with the increase, and there is a problem that it becomes large and a large mounting space is required. Furthermore, exhaust resistance increases and performance such as engine output and fuel consumption deteriorates. .
本考案は、マフラ自体の構造の複雑化及び大型化を伴う
ことなく、またエンジン性能の悪化を招くことなく、効
果的に排気騒音を低減することができるようにしたマフ
ラ装置を提供することを目的とするものである。The present invention provides a muffler device capable of effectively reducing exhaust noise without complicating and increasing the size of the structure of the muffler itself and without deteriorating engine performance. It is intended.
（課題を解決するための手段） 本考案に係るマフラ装置は、上記目的を達成するために
創案されたもので、排気ガス入口管及び排気ガス出口管
を具えたマフラと、一端に閉塞されかつ他端開口端をエ
ンジンの排気管に連結されると共に、中間部分を上記排
気ガス入口管にほぼ直角方向から接続された直線状の入
口側振動吸収管と、一端を閉塞されかつ他端開口端をテ
ールパイプに連結されると共に、中間部分を上記排気ガ
ス出口管にほぼ直角方向から接続された直線状の出口側
振動吸収管とを具え、上記入口側振動吸収管は、上記排
気ガス入口管との接続部から閉塞端までの容積が上記排
気管内に生起する気柱振動を共鳴減衰させる共鳴室を形
成するように設定されると共に、同共鳴室内にグラスウ
ール等の吸音材が収蔵され、また上記出口側振動吸収管
は、上記排気ガス出口管との接続部から閉塞端までの容
積が上記テールパイプ内に生起する気柱振動を共鳴減衰
させる共鳴室を形成するように設定されると共に、同共
鳴室内にグラスウール等の吸音材が収蔵されたことを特
徴とするものである。(Means for Solving the Problem) A muffler device according to the present invention was created to achieve the above-mentioned object, and includes a muffler having an exhaust gas inlet pipe and an exhaust gas outlet pipe, and a muffler closed at one end and The other end opening end is connected to the exhaust pipe of the engine, and the middle portion is connected to the exhaust gas inlet pipe at a substantially right angle, and a linear inlet side vibration absorption pipe, and one end is closed and the other end opening end Is connected to a tail pipe, and an intermediate portion is connected to the exhaust gas outlet pipe from a substantially right angle direction with a straight outlet side vibration absorbing pipe, and the inlet side vibration absorbing pipe is the exhaust gas inlet pipe. The volume from the connecting portion to the closed end is set so as to form a resonance chamber for resonance damping the air column vibration generated in the exhaust pipe, and a sound absorbing material such as glass wool is stored in the resonance chamber, and Above exit The side vibration absorbing pipe is set so that the volume from the connecting portion with the exhaust gas outlet pipe to the closed end forms a resonance chamber for resonance damping the air column vibration generated in the tail pipe, and It is characterized in that a sound absorbing material such as glass wool is stored in the room.
（作用） 本考案によれば、マフラの排気ガス入口管に入口側振動
吸収管が接続され、同振動吸収管がエンジンの排気管内
に生起する気柱振動を共鳴減衰させる共鳴室として作用
するので、マフラ上流の気柱振動が効果的に減衰され
る。また、マフラの排気ガス出口管に出口側振動吸収管
が接続され、同振動吸収管がテールパイプ内に生起する
気柱振動を共鳴減衰させる共鳴室として作用するので、
マフラ下流の気柱振動が効果的に減衰される。(Operation) According to the present invention, the inlet side vibration absorption pipe is connected to the exhaust gas inlet pipe of the muffler, and the vibration absorption pipe acts as a resonance chamber for resonance damping the air column vibration generated in the exhaust pipe of the engine. , Air column vibration upstream of the muffler is effectively damped. Further, since the outlet side vibration absorption pipe is connected to the exhaust gas outlet pipe of the muffler, and the vibration absorption pipe acts as a resonance chamber for resonance damping the air column vibration generated in the tail pipe,
Air column vibration downstream of the muffler is effectively damped.
（実施例） 以下本考案の実施例を添付図面について具体的に説明す
る。図中符号10はパワーショベル等作業車両用のエンジ
ンを概念的に示し、12は同エンジンの排気マニホール
ド、14は同排気マニホールドに連結された排気管、16は
マフラ18の排気ガス入口管20と上記排気管14との間に介
装された入口側振動吸収管、22はマフラ18の排気ガス出
口管24とテールパイプ26との間に介装された出口側振動
吸収管である。(Embodiment) An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. In the figure, reference numeral 10 conceptually represents an engine for a work vehicle such as a power shovel, 12 is an exhaust manifold of the engine, 14 is an exhaust pipe connected to the exhaust manifold, and 16 is an exhaust gas inlet pipe 20 of a muffler 18. The inlet-side vibration absorption pipe interposed between the exhaust pipe 14 and 22 is an outlet-side vibration absorption pipe interposed between the exhaust gas outlet pipe 24 of the muffler 18 and the tail pipe 26.
上記入口側振動吸収管16は直線状をなし、その一端が閉
塞されかつ他端に上記排気管14の下流側が連結され、更
に中間部分にほぼ直角方向からマフラの入口管20が交差
して接続されている。同吸収管16の閉塞端側には、グラ
スウール等の吸音材28が収蔵され、また入口管20との接
続部から閉塞端までの容積は、排気管14内に生起される
気柱振動を有効に共鳴減衰させ得るような容積に設定さ
れ、換言すれば上記容積に見合うように管長L1が設定さ
れてその内部に共鳴室が形成されている。他方、上記出
口側振動吸収管22は直線状をなし、その一端が閉塞され
かつ他端に上記テールパイプ26の上流側が連結され、更
に中間部分にほぼ直角方向からマフラの出口管24が交差
して接続されている。同吸収管22の閉塞端側には、グラ
スウール等の吸音材28が収蔵され、また出口管24との接
続部から閉塞端までの容積は、テールパイプ26内に生起
される気柱振動を有効に共鳴減衰させ得るような容積に
設定され、換言すれば上記容積に見合うように管長L2が
設定されてその内部に共鳴室が形成されている。The inlet-side vibration absorption pipe 16 has a linear shape, one end of which is closed and the other end of which is connected to the downstream side of the exhaust pipe 14, and the middle portion of which is connected with the muffler inlet pipe 20 in a substantially right-angled direction. Has been done. A sound absorbing material 28 such as glass wool is stored on the closed end side of the absorption pipe 16, and the volume from the connection with the inlet pipe 20 to the closed end is effective for air column vibration generated in the exhaust pipe 14. The volume is set so that the resonance can be attenuated, in other words, the tube length L 1 is set so as to correspond to the volume, and the resonance chamber is formed therein. On the other hand, the outlet-side vibration absorption pipe 22 has a linear shape, one end of which is closed and the other end thereof is connected to the upstream side of the tail pipe 26, and the outlet pipe 24 of the muffler intersects the middle portion from a substantially right angle direction. Connected. On the closed end side of the absorption pipe 22, a sound absorbing material 28 such as glass wool is stored, and the volume from the connection with the outlet pipe 24 to the closed end is effective for air column vibration generated in the tail pipe 26. Is set to such a volume that resonance damping can be performed, in other words, the tube length L 2 is set to correspond to the above-mentioned volume, and a resonance chamber is formed inside thereof.
上記構成によれば、エンジン10に排気騒音の有力な要因
の一つである排気管14及びテールパイプ26内に生起する
気柱振動が、夫々マフラ18の外部に設けられた入口側振
動吸収管16及び出口側振動吸収管22内に夫々形成された
共鳴室の作用によって有効に減衰されるので、マフラ18
の構造複雑化、大型化を伴うことなく、またエンジンの
排気抵抗の著しい増大を招くことなく、極めて効果的に
排気騒音を低減することができ、特に外気に直通してい
るテールパイプ26内の気柱振動が出口側振動吸収管22に
よって減衰される効果が著しい。この結果、マフラ18に
は小型軽量かつ安価なもの、例えばトラック等の一般車
両用に大量に生産され従って極めて安価なものを適宜流
用することができるので、製造コストを安くすることが
できる利点がある。また、図示した実施例では、入口側
及び出口側振動吸収管16及び22が夫々鉛直下向きに延在
して画かれているが、各吸収管16及び22の効果は、水平
方向、鉛直上向き、又は斜方向等配置方向の如何により
何等変化しないので、車両への搭載に際して空いたスペ
ース内に適宜配置することができ、搭載性が優れている
利点がある。According to the above configuration, the air column vibration generated in the exhaust pipe 14 and the tail pipe 26, which is one of the strong factors of the exhaust noise in the engine 10, is the inlet side vibration absorption pipe provided outside the muffler 18, respectively. The muffler 18 is effectively damped by the action of the resonance chambers formed in the vibration absorbing pipe 22 and the vibration absorbing pipe 22 on the outlet side.
The exhaust noise can be reduced extremely effectively without complicating the structure and increasing the size of the engine and without significantly increasing the exhaust resistance of the engine. Particularly, in the tail pipe 26 directly communicating with the outside air. The effect that the air column vibration is attenuated by the outlet side vibration absorption pipe 22 is remarkable. As a result, the muffler 18 is small and lightweight and inexpensive, for example, since it is possible to appropriately use an extremely inexpensive one that is mass produced for general vehicles such as trucks, there is an advantage that the manufacturing cost can be reduced. is there. Further, in the illustrated embodiment, the inlet side and outlet side vibration absorption pipes 16 and 22 are drawn so as to extend vertically downward, respectively, but the effect of each absorption pipe 16 and 22 is horizontal, vertically upward, Alternatively, since it does not change at all depending on the arrangement direction such as the oblique direction, it can be appropriately arranged in a vacant space at the time of mounting on a vehicle, and has an advantage of excellent mountability.
（考案の効果） 叙上のように、本考案に係るマフラ装置は、排気ガス入
口管及び排気ガス出口管を具えたマフラと、一端に閉塞
されかつ他端開口端をエンジンの排気管に連結されると
共に、中間部分を上記排気ガス入口管にほぼ直角方向か
ら接続された直線状の入口側振動吸収管と、一端を閉塞
されかつ他端開口端をテールパイプに連結されると共
に、中間部分を上記排気ガス出口管にほぼ直角方向から
接続された直線状の出口側振動吸収管とを具え、上記入
口側振動吸収管は、上記排気ガス入口管との接続部から
閉塞端までの容積が上記排気管内に生起する気柱振動を
共鳴減衰させる共鳴室を形成するように設定されると共
に、同共鳴室内にグラスウール等の吸音材が収蔵され、
また上記出口側振動吸収管は、上記排気ガス出口管との
接続部から閉塞端までの容積が上記テールパイプ内に生
起する気柱振動を共鳴減衰させる共鳴室を形成するよう
に設定されると共に、同共鳴室内にグラスウール等の吸
音材が収蔵されたことを特徴とし、簡単な構成によって
エンジン特に作業用車両のエンジンの排気騒音を効果的
に低減することができるので、実用上極めて有益であ
る。(Effect of the Invention) As described above, the muffler device according to the present invention includes a muffler having an exhaust gas inlet pipe and an exhaust gas outlet pipe, and one end closed and the other end open end connected to an engine exhaust pipe. And a linear inlet-side vibration absorption pipe having an intermediate portion connected to the exhaust gas inlet pipe in a direction substantially perpendicular to the exhaust gas inlet pipe, one end closed and the other end open end connected to the tail pipe, and the intermediate portion The exhaust gas outlet pipe is provided with a linear outlet side vibration absorbing pipe connected from a substantially right angle direction, and the inlet side vibration absorbing pipe has a volume from a connection portion with the exhaust gas inlet pipe to a closed end. It is set so as to form a resonance chamber for resonance damping the air column vibration occurring in the exhaust pipe, and a sound absorbing material such as glass wool is stored in the resonance chamber,
Further, the outlet side vibration absorbing pipe is set so that a volume from a connecting portion with the exhaust gas outlet pipe to a closed end forms a resonance chamber for resonance damping the air column vibration generated in the tail pipe. The sound absorbing material such as glass wool is stored in the resonance chamber, and the exhaust noise of the engine, especially the engine of the working vehicle, can be effectively reduced by the simple structure, which is extremely useful in practice. .
第１図は本考案の一実施例を示す概略構成図、第２図は
一部を断面で示した第１図の要部拡大図である。 10…エンジン、12…排気マニホールド、14…排気管、16
…入口側振動吸収管、18…マフラ、20…排気ガス入口
管、22…出口側振動吸収管、24…排気ガス出口管、６…
テールパイプ、28…吸音材。FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, and FIG. 2 is an enlarged view of an essential part of FIG. 10 ... Engine, 12 ... Exhaust manifold, 14 ... Exhaust pipe, 16
... Inlet side vibration absorbing pipe, 18 ... Muffler, 20 ... Exhaust gas inlet pipe, 22 ... Outlet side vibration absorbing pipe, 24 ... Exhaust gas outlet pipe, 6 ...
Tail pipe, 28 ... sound absorbing material.
Claims (1)
たマフラと、一端を閉塞されかつ他端開口端をエンジン
の排気管に連結されると共に、中間部分を上記排気ガス
入口管にほぼ直角方向から接続された直線状の入口側振
動吸収管と、一端を閉塞されかつ他端開口端をテールパ
イプに連結されると共に、中間部分を上記排気ガス出口
管にほぼ直角方向から接続された直線状の出口側振動吸
収管とを具え、上記入口側振動吸収管は、上記排気ガス
入口管との接続部から閉塞端までの容積が上記排気管内
に生起する気柱振動を共鳴減衰させる共鳴室を形成する
ように設定されると共に、同共鳴室内にグラスウール等
の吸音材が収蔵され、また上記出口側振動吸収管は、上
記排気ガス出口管との接続部から閉塞端までの容積が上
記テールパイプ内に生起する気柱振動を共鳴減衰させる
共鳴室を形成するように設定されると共に、同共鳴室内
にグラスウール等の吸音材が収蔵されたことを特徴とす
るマフラ装置。1. A muffler having an exhaust gas inlet pipe and an exhaust gas outlet pipe, one end of which is closed and the other open end of which is connected to an exhaust pipe of an engine, and an intermediate portion of which is substantially connected to the exhaust gas inlet pipe. A straight inlet side vibration absorbing pipe connected from a right angle direction, one end closed and the other end open end connected to a tail pipe, and an intermediate portion connected to the exhaust gas outlet pipe from a substantially right angle direction. A straight outlet-side vibration absorption pipe is provided, and the inlet-side vibration absorption pipe is a resonance for resonance damping the air column vibration generated in the exhaust pipe by the volume from the connection portion with the exhaust gas inlet pipe to the closed end. A sound absorbing material such as glass wool is stored in the resonance chamber while being set to form a chamber, and the outlet side vibration absorption pipe has a volume from a connection portion with the exhaust gas outlet pipe to a closed end. In the tail pipe While it is set to the air column vibration to form a resonant chamber for resonance attenuation occurring, muffler and wherein the sound absorbing material such as glass wool in the resonance chamber is collection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988147150U JPH072970Y2 (en) | 1988-11-11 | 1988-11-11 | Muffler device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988147150U JPH072970Y2 (en) | 1988-11-11 | 1988-11-11 | Muffler device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0269012U JPH0269012U (en) | 1990-05-25 |
| JPH072970Y2 true JPH072970Y2 (en) | 1995-01-30 |
Family
ID=31417294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988147150U Expired - Lifetime JPH072970Y2 (en) | 1988-11-11 | 1988-11-11 | Muffler device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH072970Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6106940B2 (en) * | 2012-04-05 | 2017-04-05 | ヤマハ株式会社 | Acoustic structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60188809U (en) * | 1984-05-25 | 1985-12-14 | カルソニックカンセイ株式会社 | exhaust system |
-
1988
- 1988-11-11 JP JP1988147150U patent/JPH072970Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0269012U (en) | 1990-05-25 |
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