JPH0238011Y2 - - Google Patents
Info
- Publication number
- JPH0238011Y2 JPH0238011Y2 JP1985038719U JP3871985U JPH0238011Y2 JP H0238011 Y2 JPH0238011 Y2 JP H0238011Y2 JP 1985038719 U JP1985038719 U JP 1985038719U JP 3871985 U JP3871985 U JP 3871985U JP H0238011 Y2 JPH0238011 Y2 JP H0238011Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust pipe
- mounting device
- frequency
- vibration
- elastic member
- 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
- 230000005540 biological transmission Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Vibration Prevention Devices (AREA)
- Exhaust Silencers (AREA)
- Supports For Pipes And Cables (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は車両のエキゾーストパイプ取付装置に
関し、特にその防振構造に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a vehicle exhaust pipe mounting device, and particularly to its vibration isolation structure.
第６図において、エンジンＥの排気ガスを流通
せしめるエキゾーストパイプＰは、車両ボデー下
面に沿つて前後方向に延びており、その複数個所
で取付装置１により車両フレームＦに支持せしめ
てある。これを更に詳述すると、上記取付装置１
は、一対のブラケツト１１，１２を防振用ゴム体
１３を介して結合してなり、一方のブラケツト１
１を、サイドフレームＦ１間に架設したクロスメ
ンバＦ２に固定するとともに、他方のブラケツト
１２をエキゾーストパイプＰに溶接結合してこれ
を支持している。
In FIG. 6, an exhaust pipe P through which exhaust gas from an engine E flows extends in the front-rear direction along the lower surface of the vehicle body, and is supported on the vehicle frame F by mounting devices 1 at a plurality of locations. To explain this in more detail, the above mounting device 1
is formed by connecting a pair of brackets 11 and 12 via a vibration-proofing rubber body 13, with one bracket 1
1 is fixed to a cross member F2 installed between the side frames F1, and the other bracket 12 is welded to and supported by an exhaust pipe P.
かかる構造の取付装置１の振動伝達率は、第２
図破線で示す如く、振動周波数が高くなるに従つ
て漸次小さくなる特性を示す。 The vibration transmissibility of the mounting device 1 having such a structure is the second
As shown by the broken line in the figure, the vibration frequency exhibits a characteristic that gradually decreases as the vibration frequency increases.
ところで、上記エキゾーストパイプは通常、
100〜140Hzの範囲に共振周波数0を有しており、
エンジンＥの排気ガス脈動の周波数が上記周波数
0に一致すると、大きな共振振動を生じる。すな
わち、第３図に示す如く、エキゾーストパイプＰ
の振動レベルは、周波数0で急激に大きくなつて
ピークを示す。しかして、この共振振動は、上記
振動伝達特性を有する従来の取付装置１によつて
は、第４図破線で示す如く、フレームＦに大きく
伝達されて、こもり音を生ぜしめる。
By the way, the above exhaust pipe is usually
It has a resonance frequency of 0 in the range of 100-140Hz,
The frequency of exhaust gas pulsation of engine E is the above frequency.
If it matches 0 , a large resonant vibration will occur. That is, as shown in Fig. 3, the exhaust pipe P
The vibration level suddenly increases and reaches a peak at frequency 0 . However, in the conventional mounting device 1 having the above-mentioned vibration transmission characteristics, this resonant vibration is largely transmitted to the frame F, as shown by the broken line in FIG. 4, causing muffled noise.
そこで、従来は、取付装置１のフレームＦへの
固定位置を変更し、ゴム体１３の硬度を小さく
し、あるいはフレームＦを強化する等の対策を施
しているが、フレームＦの設計上の制約パイプ支
持力の低下フレーム重量の増大という新たな問題
が生じる。 Conventionally, countermeasures have been taken such as changing the fixing position of the mounting device 1 to the frame F, reducing the hardness of the rubber body 13, or strengthening the frame F. However, due to the design limitations of the frame F, countermeasures have been taken. A new problem arises: reduced pipe support capacity and increased frame weight.
本考案はかかる問題点に鑑みて、これを解決す
るエキゾーストパイプ取付装置を提供することを
目的とする。 SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide an exhaust pipe mounting device that solves these problems.
本考案の構成を説明すると、一端を車両フレー
ムＦ２に固定したブラケツト１１と、エキゾース
トパイプＰを支持するブラケツト１２とを、弾性
部材１３を介して結合してなるエキゾーストパイ
プの取付装置は、上記弾性部材１３内にこれを車
両フレームＦ２側とエキゾーストパイプＰ側の各
半部１３ａ，１３ｂに区画するように所定質量の
重錘１４を設けて該重錘１４と上記弾性部材１３
とで共振系を構成し、該共振系の共振周波数1を
上記エキゾーストパイプＰの共振周波数0より低
周波側に設定したものである。
To explain the structure of the present invention, an exhaust pipe mounting device is formed by connecting a bracket 11 whose one end is fixed to the vehicle frame F2 and a bracket 12 supporting the exhaust pipe P via an elastic member 13. A weight 14 of a predetermined mass is provided in the member 13 so as to divide it into halves 13a and 13b on the vehicle frame F2 side and the exhaust pipe P side, and the weight 14 and the elastic member 13 are connected to each other.
This constitutes a resonant system, and the resonant frequency 1 of the resonant system is set to be lower than the resonant frequency 0 of the exhaust pipe P.
弾性部材１３のバネ定数をＫとすると、取付装
置１は次式で決定される共振周鍋数1を有する。
When the spring constant of the elastic member 13 is K, the mounting device 1 has a resonant circumferential pot number 1 determined by the following equation.
（但し、ｇは重力加速度である）
すなわち、この場合の装置１の振動伝達率は、
第２図実線で示す如く、周波数1でピークを示し
た後は急激に低下し、問題となるエキゾーストパ
イプＰの共振周波数0では極めて小さなものとな
る。しかして、第４図実線で示す如く、共振振動
のフレームＦへの入力は効果的に抑えられる。 (However, g is the gravitational acceleration.) In other words, the vibration transmissibility of the device 1 in this case is:
As shown by the solid line in FIG. 2, after peaking at frequency 1, it rapidly decreases, and becomes extremely small at the problematic resonance frequency 0 of the exhaust pipe P. Therefore, as shown by the solid line in FIG. 4, input of resonance vibration to the frame F can be effectively suppressed.
かくの如く、本考案の取付装置によれば、パイ
プ支持力の低下やフレーム重量の増大を招くこと
なく、エキゾーストパイプの共振振動の伝達を防
止することができ、こもり音の大幅な低減が可能
となる。 As described above, according to the mounting device of the present invention, it is possible to prevent the transmission of resonance vibrations of the exhaust pipe without reducing the pipe supporting force or increasing the frame weight, and it is possible to significantly reduce muffled noise. becomes.
第１図において、取付装置１のゴム体１３は、
上半部１３ａと下半部１３ｂよりなり、各下面な
いし上面がそれぞれ重錘１４の上下面に接合して
ある。上半部１３ａの上面にはブラケツト板１１
が接合してあり、該ブラケツト板１１は車両のク
ロスメンバＦ２にボルト結合されている。上記下
半部１３ｂの下面には、Ｌ字形のブラケツト板１
２が接合してあり、その下端はエキゾーストパイ
プＰに溶接固定されてこれを支持している。
In FIG. 1, the rubber body 13 of the mounting device 1 is
It consists of an upper half part 13a and a lower half part 13b, each of which has a lower surface or an upper surface joined to the upper and lower surfaces of the weight 14, respectively. A bracket plate 11 is provided on the upper surface of the upper half portion 13a.
The bracket plate 11 is bolted to the cross member F2 of the vehicle. An L-shaped bracket plate 1 is provided on the lower surface of the lower half portion 13b.
2 are joined, and its lower end is welded and fixed to the exhaust pipe P to support it.
上記構造になる取付装置１は、上半部１３ａお
よび下半部１３ｂのバネ定数をそれぞれＫ１，Ｋ
２とし、重錘１４の重量をＷとして、次式で決定
される共振周波数1を有する。 The mounting device 1 having the above structure has spring constants K1 and K of the upper half 13a and the lower half 13b, respectively.
2 and the weight of the weight 14 is W, it has a resonance frequency 1 determined by the following equation.
（但し、ｇは重力加速度である）
上記重錘１４の重量Ｗを適当に選ぶと、取付装
置１の振動伝達率は、第２図実線で示す如く、エ
キゾーストパイプＰの共振周波数0（これは通常
100〜140Hzにある）より充分に低い周波数1でピ
ークを示し、その後は周波数が上がるにつれて急
速に低下して、上記周波数0付近では充分に小さ
な値となる。 (However, g is the gravitational acceleration.) When the weight W of the weight 14 is appropriately selected, the vibration transmissibility of the mounting device 1 is as shown by the solid line in Figure 2, and the resonance frequency of the exhaust pipe P is 0 (this is usually
It shows a peak at frequency 1, which is sufficiently lower than 100 to 140 Hz), and then rapidly decreases as the frequency increases, reaching a sufficiently small value near frequency 0.
しかして、上記構造の取付装置１に、周波数0
に共振点を有する第３図に示す如きエキゾースト
パイプＰの振動が入力した場合、これは取付装置
１により伝達を阻止されて、クロスメンバＦ２に
は、第４図実線で示す如く、周波数0，1にわず
かなピークを有する充分に小さい振動のみが入力
する。 Therefore, in the mounting device 1 having the above structure, the frequency 0
When the vibration of the exhaust pipe P shown in FIG. 3, which has a resonance point at Only sufficiently small vibrations with a slight peak at 1 are input.
周波数1は充分に低いことにより、そのピーク
振動入力はこもり音とはならず、一方周波数0に
おけるピーク振動入力は大幅に減少することによ
り、こもり音は充分に低下せしめられる。これを
第５図に示す。図中破線で示す従来装置と比較す
ると、100〜140Hzの中速および高速こもり音が効
果的に低減せしめられている。 Since frequency 1 is sufficiently low, its peak vibration input does not result in muffled sound, while the peak vibration input at frequency 0 is significantly reduced, so that muffled sound is sufficiently reduced. This is shown in FIG. Compared to the conventional device shown by the broken line in the figure, medium-speed and high-speed muffled sounds of 100 to 140 Hz are effectively reduced.
第１図は本考案の取付装置の全体断面図、第２
図は取付装置の振動伝達特性を示す図、第３図は
エキゾーストパイプの振動特性を示す図、第４図
は取付装置を介してフレームへ入力する振動の特
性を示す図、第５図はこもり音の低減効果を示す
図、第６図は従来の取付装置を具備するエキゾー
ストパイプの全体側面図である。
Ｅ……エンジン、Ｆ……車両フレーム、Ｆ１…
…サイドフレーム、Ｆ２……クロスメンバ、Ｐ…
…エキゾーストパイプ、１……取付装置、１１，
１２……ブラケツト、１３……弾性部材、１３
ａ，１３ｂ……半部、１４……重錘。
Figure 1 is an overall sectional view of the mounting device of the present invention, Figure 2
Figure 3 shows the vibration transmission characteristics of the mounting device, Figure 3 shows the vibration characteristics of the exhaust pipe, Figure 4 shows the characteristics of vibration input to the frame via the mounting device, and Figure 5 shows the vibration characteristics of the exhaust pipe. FIG. 6, which shows the sound reduction effect, is an overall side view of an exhaust pipe equipped with a conventional mounting device. E...Engine, F...Vehicle frame, F1...
...Side frame, F2...Cross member, P...
...Exhaust pipe, 1...Mounting device, 11,
12... Bracket, 13... Elastic member, 13
a, 13b...half part, 14...weight.
Claims (1)
エキゾーストパイプを支持するブラケツトとを、
弾性部材を介して結合しなるエキゾーストパイプ
の取付装置において、上記弾性部材内にこれを車
両フレーム側とエキゾーストパイプ側の各半部に
区画するように所定質量の重錘を設けて該重錘と
上記弾性部材とで共振系を構成し、該共振系の共
振周波数を上記エキゾーストパイプの共振周波数
より低周波側に設定したことを特徴とするエキゾ
ーストパイプ取付装置。 a bracket with one end fixed to the vehicle frame;
A bracket that supports the exhaust pipe,
In a mounting device for an exhaust pipe that is connected via an elastic member, a weight of a predetermined mass is provided in the elastic member so as to divide the elastic member into two halves, one on the vehicle frame side and the other on the exhaust pipe side. An exhaust pipe mounting device characterized in that the elastic member constitutes a resonance system, and the resonance frequency of the resonance system is set to a lower frequency side than the resonance frequency of the exhaust pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985038719U JPH0238011Y2 (en) | 1985-03-18 | 1985-03-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985038719U JPH0238011Y2 (en) | 1985-03-18 | 1985-03-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61155621U JPS61155621U (en) | 1986-09-26 |
| JPH0238011Y2 true JPH0238011Y2 (en) | 1990-10-15 |
Family
ID=30545987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985038719U Expired JPH0238011Y2 (en) | 1985-03-18 | 1985-03-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0238011Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5297734U (en) * | 1976-01-21 | 1977-07-22 |
-
1985
- 1985-03-18 JP JP1985038719U patent/JPH0238011Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61155621U (en) | 1986-09-26 |
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