JPH04276170A - Muffler device for internal combustion engine - Google Patents
Muffler device for internal combustion engineInfo
- Publication number
- JPH04276170A JPH04276170A JP6127691A JP6127691A JPH04276170A JP H04276170 A JPH04276170 A JP H04276170A JP 6127691 A JP6127691 A JP 6127691A JP 6127691 A JP6127691 A JP 6127691A JP H04276170 A JPH04276170 A JP H04276170A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- internal combustion
- combustion engine
- resonance
- interference
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 20
- 230000030279 gene silencing Effects 0.000 claims description 25
- 230000003584 silencer Effects 0.000 claims description 7
- 239000011810 insulating material Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 4
- 239000011491 glass wool Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Superstructure Of Vehicle (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、自動車、船舶等の内燃
機関のように上方にエンジンフードが設けられた内燃機
関において、その吸気管路に発生する吸気音を消すため
に設けられる消音装置に関するものである。[Industrial Application Field] The present invention relates to a silencing device installed in an internal combustion engine such as an internal combustion engine of an automobile, a ship, etc., which is provided with an engine hood above, in order to eliminate intake noise generated in the intake pipe. It is related to.
【0002】0002
【従来の技術】この種の消音装置として、従来より、■
吸気管路に連通孔を介して連通する箱状の共鳴消音室が
設けられた共鳴型の消音装置、■吸気管路に一端が連通
するサイドブランチ共鳴管が設けられたサイドブランチ
共鳴型の消音装置、■吸気管路に両端が連通する干渉管
が設けられた干渉型の消音装置等が知られており、これ
らはエンジンルーム内における吸気管路の近くにスペー
スを確保して配設されている。[Prior Art] Conventionally, as this type of silencer,
Resonant type muffling device with a box-shaped resonant muffling chamber that communicates with the intake pipe through a communication hole; ■ Side branch resonance muffler with a side branch resonant pipe whose one end communicates with the intake pipe. Interference-type silencers are known in which interference pipes are installed at both ends of the intake pipe, and these are installed near the intake pipe in the engine room with a space secured. There is.
【0003】0003
【発明が解決しようとする課題】ところが、エンジンル
ーム内のスペースは限られており、特に吸気管路の近く
は多くの部品や配管が密集して狭くなっている。これに
対して、上記■の共鳴型の消音装置は、その共鳴消音室
の体積が大きく、また、上記■又は■のサイドブランチ
共鳴型又は干渉型の消音装置は、そのサイドブランチ共
鳴管又は干渉管の長さがかなり大きく、特に消音周波数
が低い場合には100cm以上にもなる。このため、エ
ンジンルーム内の吸気管路の近くに、これらの消音装置
の配設用スペースを確保するのは難しかった。However, the space in the engine room is limited, and the area near the intake pipe is especially narrow because many parts and pipes are crowded together. On the other hand, in the resonance type muffler of item (1) above, the volume of the resonant muffling chamber is large, and in the side branch resonance type or interference type muffler of The length of the tube is quite large, reaching more than 100 cm, especially when the silencing frequency is low. For this reason, it has been difficult to secure space for installing these silencers near the intake pipe in the engine room.
【0004】本発明の目的は、上記課題を解決し、エン
ジンルーム内における消音装置の配設用スペースの確保
が容易になり、内燃機関からの熱を遮断してエンジンフ
ードの温度上昇を防止することもできる消音装置を提供
することにある。An object of the present invention is to solve the above-mentioned problems, to make it easier to secure a space for installing a silencer in the engine room, and to prevent the temperature of the engine hood from rising by blocking heat from the internal combustion engine. It is an object of the present invention to provide a silencing device that can also be used.
【0005】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る内燃機関の消音装置は、内燃機関の吸
気管路に連通する共鳴消音室、サイドブランチ共鳴管又
は干渉管(以下、共鳴消音室等という。)が設けられた
消音装置において、前記共鳴消音室等は、全体として偏
平な外形をなすように形成され、エンジンフードの裏面
に配設されたことを特徴とする。また、前記共鳴消音室
等の内部には断熱材を入れることが好ましい。[Means for Solving the Problems] In order to achieve the above object, a muffling device for an internal combustion engine according to the present invention provides a resonant muffling chamber, a side branch resonant pipe or an interference pipe (hereinafter referred to as , a resonant silencing chamber, etc.) is characterized in that the resonant silencing chamber, etc. is formed to have a flat outer shape as a whole and is disposed on the back surface of the engine hood. Further, it is preferable that a heat insulating material be placed inside the resonance muffling chamber or the like.
【0006】[0006]
【作用】上記のように構成された消音装置によれば、全
体として偏平な外形をなすように形成された共鳴消音室
等がエンジンフードの裏面に配設されているので、従来
のように多くの部品や配管が密集した吸気管路の近くに
共鳴消音室等の配設用スペースを設ける必要がない。ま
た、この偏平な共鳴消音室等は、内燃機関とエンジンフ
ードとの間に位置するとともに、その内部は熱伝導率の
低い空気が大半なので、内燃機関からエンジンフードへ
の熱の輻射又は対流を遮断し、エンジンフードの温度上
昇を防止する。従って、従来のようにエンジンフードの
裏面に断熱シート等を配設する必要がなく、換言すれば
、従来の断熱シート等に代えて共鳴消音室等を配設すれ
ばよい。また、前記共鳴消音室等の内部に断熱材を入れ
れば、前記断熱効果はさらに高くなる。[Operation] According to the silencer configured as described above, the resonant silencing chamber, etc., which is formed to have an overall flat outer shape, is arranged on the back side of the engine hood. There is no need to provide a space for installing a resonance muffling chamber or the like near the intake pipe where parts and piping are crowded. In addition, this flat resonance muffling chamber is located between the internal combustion engine and the engine hood, and since the interior thereof is mostly air with low thermal conductivity, it prevents heat radiation or convection from the internal combustion engine to the engine hood. shuts off and prevents the temperature of the engine hood from rising. Therefore, there is no need to dispose a heat insulating sheet or the like on the back surface of the engine hood as in the conventional case; in other words, a resonance muffling chamber or the like may be disposed in place of the conventional heat insulating sheet or the like. Furthermore, if a heat insulating material is placed inside the resonance muffling chamber or the like, the heat insulating effect will be further enhanced.
【0007】[0007]
【実施例】本発明を自動車の内燃機関の吸気管路に設け
る共鳴型の消音装置に具体化した第一実施例について、
図1〜図3を参照して説明する。自動車11のエンジン
ルーム12内において、内燃機関13のエアクリーナ1
と燃料噴射装置2との間を結ぶ吸気管路としてのエアホ
ース3の途中には、下端がエアホース3に連通し上端が
開口した連通管5が上向きに突設されている。また、エ
ンジンルーム12を開閉可能に覆うエンジンフード14
の裏面には、全体として偏平な外形をなすように耐熱合
成樹脂又は金属により形成された共鳴消音室4が配設さ
れ、図示しないボルト等により取り付けられている。こ
の共鳴消音室4の下面には連通孔6が形成され、その周
囲には軟質のパッキン7が取り付けられている。そして
、エンジンフード14を閉じたときには、このパッキン
7が前記連通管5の上端に気密状態で当接して、共鳴消
音室4の連通孔6が連通管5の開口に連通するとともに
、該共鳴消音室4が内燃機関13の直ぐ上方に位置する
ようになっている。この共鳴消音室4の共鳴周波数すな
わち消音周波数f0 は、次の数1で示される。[Embodiment] A first embodiment in which the present invention is embodied in a resonance type muffling device installed in an intake pipe of an internal combustion engine of an automobile.
This will be explained with reference to FIGS. 1 to 3. In the engine room 12 of the automobile 11, the air cleaner 1 of the internal combustion engine 13 is installed.
A communication pipe 5 whose lower end communicates with the air hose 3 and whose upper end is open is provided in the middle of the air hose 3 as an intake pipe connecting between the fuel injection device 2 and the fuel injection device 2 . Also, an engine hood 14 that covers the engine room 12 in an openable and closable manner.
A resonant silencing chamber 4 made of heat-resistant synthetic resin or metal is disposed on the back surface of the resonant silencing chamber 4 so as to have a flat outer shape as a whole, and is attached with bolts or the like (not shown). A communication hole 6 is formed in the lower surface of the resonance muffling chamber 4, and a soft packing 7 is attached around the communication hole 6. When the engine hood 14 is closed, the packing 7 comes into airtight contact with the upper end of the communication pipe 5, so that the communication hole 6 of the resonance silencing chamber 4 communicates with the opening of the communication pipe 5, and the resonance silencing chamber 4 communicates with the opening of the communication pipe 5. The chamber 4 is located directly above the internal combustion engine 13. The resonance frequency of the resonance silencing chamber 4, that is, the silencing frequency f0, is expressed by the following equation 1.
【0008】[0008]
【数1】f0 =(C/2π)・√(S/(V・L))
ここで、C =331.5+0.61t :音速(
m/秒)
S =πD2/4 :連通管5の断面積D :連
通管5の内径
V :共鳴消音室4の容積
L =L1 +0.8D
L1 :連通管5の長さ
t :温度(℃)[Math. 1] f0 = (C/2π)・√(S/(V・L))
Here, C = 331.5 + 0.61t: Speed of sound (
m/sec) S = πD2/4: Cross-sectional area of communication tube 5 D: Inner diameter of communication tube 5 V: Volume of resonance silencing chamber 4 L = L1 +0.8D L1: Length t of communication tube 5: Temperature (℃ )
【0009】本実施例では、温度20℃において消音周
波数f0 を例えば90Hzに設定するために、前記連
通管5はD=5cm、S=19.6cm2、L1 =2
0cmの円筒状に形成されている。また、共鳴消音室4
は内法において前後幅30cm、左右幅50cm、高さ
2cmの偏平な直方体容器状に形成され、V=3000
cm3が確保されている。さらに、この共鳴消音室4の
内部には断熱材としてのグラスウール8が入れられてい
る。In this embodiment, in order to set the silencing frequency f0 to, for example, 90 Hz at a temperature of 20° C., the communicating pipe 5 has a diameter of D=5 cm, S=19.6 cm2, and L1=2.
It is formed into a 0 cm cylindrical shape. In addition, the resonance silencing chamber 4
is formed in the shape of a flat rectangular parallelepiped container with an inner width of 30 cm, a width of 50 cm, and a height of 2 cm, and V = 3000.
cm3 is secured. Further, glass wool 8 as a heat insulating material is placed inside the resonance muffling chamber 4.
【0010】以上のように構成された本実施例の消音装
置によれば、全体として偏平な外形をなすように形成さ
れた共鳴消音室4がエンジンフード14の裏面に配設さ
れているので、従来のように多くの部品や配管が密集し
たエアホース3の近くに共鳴消音室の配設用スペースを
設ける必要がない。また、この偏平な共鳴消音室4は、
内燃機関13とエンジンフード14との間に位置すると
ともに、その内部は熱伝導率の低い空気が大半なので、
内燃機関13からエンジンフード14への熱の輻射又は
対流を遮断し、エンジンフード14の温度上昇を防止す
る。さらに、本実施例では共鳴消音室4の内部にグラス
ウール8が入れられているので、前記断熱効果がさらに
高くなっている。従って、従来のようにエンジンフード
14の裏面に配設されていた断熱シート等は不要になる
。According to the silencing device of this embodiment constructed as described above, the resonant silencing chamber 4, which is formed to have an overall flat outer shape, is disposed on the back surface of the engine hood 14. There is no need to provide a space for arranging a resonant silencing chamber near the air hose 3 where many parts and piping are crowded as in the past. Moreover, this flat resonant silencing chamber 4 is
It is located between the internal combustion engine 13 and the engine hood 14, and the interior is mostly air with low thermal conductivity.
Radiation or convection of heat from the internal combustion engine 13 to the engine hood 14 is blocked to prevent the temperature of the engine hood 14 from rising. Furthermore, in this embodiment, glass wool 8 is placed inside the resonance muffling chamber 4, so that the heat insulation effect is further enhanced. Therefore, a heat insulating sheet or the like disposed on the back surface of the engine hood 14 as in the past becomes unnecessary.
【0011】次に、図4及び図5に示す第二実施例は、
偏平な直方体容器15の内部を仕切板16で渦巻状に仕
切ることにより、一端がエアホース3に連通し、他端が
閉塞した渦巻状のサイドブランチ共鳴管9が、全体とし
て偏平な外形をなすように形成されており、このサイド
ブランチ共鳴管9がエンジンフード14の裏面に配設さ
れている点においてのみ、第一実施例と相違している。
このサイドブランチ共鳴管9の長さをL2 とすると、
その共鳴周波数すなわち消音周波数f0 は、次の数2
で示される。Next, the second embodiment shown in FIGS. 4 and 5 is as follows.
By partitioning the inside of the flat rectangular parallelepiped container 15 in a spiral shape with the partition plate 16, the spiral side branch resonance tube 9, which is connected to the air hose 3 at one end and closed at the other end, has a flat outer shape as a whole. The second embodiment differs from the first embodiment only in that the side branch resonance pipe 9 is disposed on the back surface of the engine hood 14. If the length of this side branch resonance tube 9 is L2, then
The resonant frequency, that is, the silencing frequency f0, is given by the following equation 2
It is indicated by.
【0012】0012
【数2】f0 =(2n−1)C/4L2ここで、n
=1,2,…[Formula 2] f0 = (2n-1)C/4L2 where, n
=1,2,...
【0013】いま、温度20℃において消音周波数f0
を例えば60Hzに設定するためには、L2 =14
3cmとかなり長くしなければならない。しかし、本実
施例の消音装置によれば、サイドブランチ共鳴管9が渦
巻状に屈曲されて偏平に纏められているので、長さ方向
に嵩張らなくなる。この第三実施例も第一実施例と同様
の効果を奏する。Now, at a temperature of 20°C, the silencing frequency f0
For example, to set 60Hz, L2 = 14
It has to be quite long, 3cm. However, according to the muffling device of this embodiment, the side branch resonance tube 9 is bent in a spiral shape and gathered into a flat shape, so that the side branch resonance tube 9 is not bulky in the length direction. This third embodiment also has the same effects as the first embodiment.
【0014】次に、図6及び図7に示す第三実施例は、
偏平な直方体容器15の内部を仕切板16で蛇行状に仕
切ることにより、両端がエアホース3に連通する蛇行状
の干渉管10が、全体として偏平な外形をなすように形
成されており、この干渉管10がエンジンフード14の
裏面に配設されている点においてのみ、第一実施例と相
違している。この干渉管10の両端間の実効長さ(蛇行
を延ばしたときの長さ)をL3 とし、干渉管10の両
端の開口部間の直線距離、すなわち干渉管10に対応す
るエアホース3の対応長さをL4 とすると、L3 −
L4 が半波長となる周波数で干渉が起こるから、この
干渉の周波数すなわち消音周波数f0 は、次の数3で
示される。Next, the third embodiment shown in FIGS. 6 and 7 is as follows.
By partitioning the inside of the flat rectangular parallelepiped container 15 in a meandering manner with a partition plate 16, a meandering interference pipe 10 whose both ends communicate with the air hose 3 is formed so as to have a flat outer shape as a whole. This embodiment differs from the first embodiment only in that the pipe 10 is disposed on the back side of the engine hood 14. The effective length between both ends of this interference tube 10 (the length when the meandering is extended) is L3, and the straight line distance between the openings at both ends of the interference tube 10, that is, the corresponding length of the air hose 3 corresponding to the interference tube 10. If the length is L4, then L3 −
Since interference occurs at a frequency where L4 is a half wavelength, the frequency of this interference, ie, the silencing frequency f0, is expressed by the following equation 3.
【0015】[0015]
【数3】f0 =C/[2(L3 −L4 )][Math 3] f0 = C/[2(L3-L4)]
【00
16】いま、消音周波数f0 を例えば100Hzに設
定するためには、L3 −L4 =172cmでなけれ
ばならない。よって、例えばL4 =40cmとすると
、L3=212cmと非常に長くしなければならない。
しかし、本実施例の消音装置によれば、干渉管10が蛇
行状に屈曲されて偏平に纏められているので、長さ方向
に嵩張らなくなる。この第三実施例も第一実施例と同様
の効果を奏する。00
16] Now, in order to set the silencing frequency f0 to 100 Hz, for example, L3-L4 must be 172 cm. Therefore, for example, if L4 = 40 cm, L3 must be extremely long, ie, 212 cm. However, according to the silencer of this embodiment, since the interference tube 10 is bent in a meandering manner and gathered up flatly, the interference tube 10 is not bulky in the length direction. This third embodiment also has the same effects as the first embodiment.
【0017】なお、本発明は前記実施例の構成に限定さ
れず、発明の趣旨から逸脱しない範囲で任意に変更して
具体化することもできる。It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, but can be modified and embodied as desired without departing from the spirit of the invention.
【0018】[0018]
【発明の効果】本発明に係る内燃機関の消音装置は、上
記の通り構成されているので、エンジンルーム内におけ
る消音装置の配設用スペースの確保が容易になり、内燃
機関からの熱を遮断してエンジンフードの温度上昇を防
止することもできるという優れた効果を奏する。[Effects of the Invention] Since the silencer for an internal combustion engine according to the present invention is configured as described above, it is easy to secure a space for installing the silencer in the engine room, and the heat from the internal combustion engine is blocked. This has the excellent effect of preventing the temperature of the engine hood from rising.
【図1】第一実施例に係る共鳴型の消音装置の取付状態
を示す斜視図である。FIG. 1 is a perspective view showing an attached state of a resonance type muffler according to a first embodiment.
【図2】同消音装置の断面図である。FIG. 2 is a sectional view of the same muffler.
【図3】同消音装置の取付状態を示す正面図である。FIG. 3 is a front view showing the installed state of the muffling device.
【図4】第二実施例に係るサイドブランチ共鳴型の消音
装置の断面図である。FIG. 4 is a sectional view of a side branch resonance type muffling device according to a second embodiment.
【図5】同消音装置のサイドブランチ共鳴管の底面図で
ある。FIG. 5 is a bottom view of a side branch resonance tube of the same muffler.
【図6】第三実施例に係る干渉型の消音装置の断面図で
ある。FIG. 6 is a sectional view of an interference type muffling device according to a third embodiment.
【図7】同消音装置の干渉管の底面図である。FIG. 7 is a bottom view of the interference tube of the same muffler.
3 吸気管路としてのエアホース 4 共鳴
消音室8 断熱材としてのグラスウール 9
サイドブランチ共鳴管
10 干渉管
13 内燃機関14 エンジンフード3 Air hose as intake pipe 4 Resonance muffling chamber 8 Glass wool as heat insulating material 9
Side branch resonance tube 10 interference tube
13 Internal combustion engine 14 Engine hood
Claims (2)
音室、サイドブランチ共鳴管又は干渉管が設けられた消
音装置において、前記共鳴消音室、サイドブランチ共鳴
管又は干渉管は、全体として偏平な外形をなすように形
成され、エンジンフードの裏面に配設されたことを特徴
とする内燃機関の消音装置。1. A silencer provided with a resonance silencing chamber, a side branch resonance tube, or an interference tube communicating with an intake pipe of an internal combustion engine, wherein the resonance silencing chamber, side branch resonance tube, or interference tube is flat as a whole. 1. A muffler for an internal combustion engine, characterized in that it is formed to have an external shape and is disposed on the back side of an engine hood.
管又は干渉管の内部には断熱材が入れられたことを特徴
とする請求項1記載の内燃機関の消音装置。2. The muffling device for an internal combustion engine according to claim 1, wherein a heat insulating material is placed inside the resonant muffling chamber, the side branch resonant pipe, or the interference pipe.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6127691A JPH04276170A (en) | 1991-03-01 | 1991-03-01 | Muffler device for internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6127691A JPH04276170A (en) | 1991-03-01 | 1991-03-01 | Muffler device for internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04276170A true JPH04276170A (en) | 1992-10-01 |
Family
ID=13166526
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6127691A Pending JPH04276170A (en) | 1991-03-01 | 1991-03-01 | Muffler device for internal combustion engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04276170A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007064123A (en) * | 2005-08-31 | 2007-03-15 | Honda Motor Co Ltd | Intake device for vehicle |
JP2013224644A (en) * | 2012-04-23 | 2013-10-31 | Tigers Polymer Corp | Suction duct with silencer |
JP2015051710A (en) * | 2013-09-06 | 2015-03-19 | 豊田合成株式会社 | Hood for motor vehicle |
-
1991
- 1991-03-01 JP JP6127691A patent/JPH04276170A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007064123A (en) * | 2005-08-31 | 2007-03-15 | Honda Motor Co Ltd | Intake device for vehicle |
JP4673168B2 (en) * | 2005-08-31 | 2011-04-20 | 本田技研工業株式会社 | Intake device for vehicle |
JP2013224644A (en) * | 2012-04-23 | 2013-10-31 | Tigers Polymer Corp | Suction duct with silencer |
JP2015051710A (en) * | 2013-09-06 | 2015-03-19 | 豊田合成株式会社 | Hood for motor vehicle |
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