JPH0430334Y2 - - Google Patents
Info
- Publication number
- JPH0430334Y2 JPH0430334Y2 JP1985070714U JP7071485U JPH0430334Y2 JP H0430334 Y2 JPH0430334 Y2 JP H0430334Y2 JP 1985070714 U JP1985070714 U JP 1985070714U JP 7071485 U JP7071485 U JP 7071485U JP H0430334 Y2 JPH0430334 Y2 JP H0430334Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust pipe
- pipe
- seal ring
- annular groove
- extension
- 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
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
- Joints With Sleeves (AREA)
- Gasket Seals (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は内燃機関における排気管の接続構造に
関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an exhaust pipe connection structure in an internal combustion engine.
［従来の技術］
例えば実開昭59−67528号公報に開示されるよ
うに、鋳鉄製の排気マニホールドは集合管や途中
の排気管に、シールリングを介して延長管を嵌合
される。従来の排気マニホールドでは、排ガスが
排気管の嵌合による接続部へ真直ぐに流入するの
を抑えるために、接続部で排気管の内径は下流側
へ向つて次第に絞られ、排気管の絞り部と延長管
との間に、断面かぎ形に屈曲した突合せ面を備え
られる。しかし、鋳鉄製の排気管に、上述のよう
な突合せ面を機械加工により形成するのは手数が
掛り、コストがかさむという難点がある。また、
接続部のシールリングは排ガスに直接曝されるの
で、接続部の熱膨張・収縮に耐え得るものとは言
いがたい。[Prior Art] For example, as disclosed in Japanese Utility Model Application Publication No. 59-67528, in a cast iron exhaust manifold, an extension pipe is fitted to a collecting pipe or an intermediate exhaust pipe via a seal ring. In conventional exhaust manifolds, in order to prevent exhaust gas from flowing straight into the joint where the exhaust pipe fits, the inner diameter of the exhaust pipe is gradually narrowed toward the downstream side at the joint, and the exhaust pipe is connected to the constricted part of the exhaust pipe. An abutment surface having a hook-shaped cross section is provided between the extension tube and the extension tube. However, forming the above-mentioned abutment surface on a cast iron exhaust pipe by machining is time-consuming and costly. Also,
Since the seal ring of the connection part is directly exposed to exhaust gas, it cannot be said that it can withstand the thermal expansion and contraction of the connection part.
［考案が解決しようとする問題点］
本考案の目的は上述の問題に鑑み、構成が簡単
で機械的加工が容易であり、シールリングが排ガ
スに曝されて固着する恐れがない、排気管の接続
構造を提供することにある。[Problems to be solved by the invention] In view of the above-mentioned problems, the purpose of the invention is to create an exhaust pipe that has a simple structure, is easy to mechanically process, and has no risk of the seal ring becoming stuck due to exposure to exhaust gas. The purpose is to provide a connection structure.
［問題を解決するための手段］
上記目的を達成するために、本考案の構成は薄
肉の保護管に排気管と延長管の各端部を外嵌し、
排気管の端部に形成した大径円筒部に延長管を嵌
合し、延長管の外周面に設けた環状溝に、外周面
が大径円筒部に接するシールリングを係合し、シ
ールリングのリング幅の前記環状溝の溝幅に対す
る割合を0.65〜0.9にして、環状溝に溝幅方向の
隙間を備えたものである。[Means for solving the problem] In order to achieve the above object, the configuration of the present invention is to fit each end of the exhaust pipe and the extension pipe into a thin protection pipe,
An extension pipe is fitted into the large-diameter cylindrical part formed at the end of the exhaust pipe, and a seal ring whose outer peripheral surface touches the large-diameter cylindrical part is engaged with an annular groove provided on the outer peripheral surface of the extension pipe. The ratio of the ring width to the groove width of the annular groove is set to 0.65 to 0.9, and the annular groove is provided with a gap in the groove width direction.
［作用］
排気管と延長管の各端部に嵌合した保護管は、
シールリングが排ガスに直接曝されるのを防止す
るから、シールリングは熱に対するへたりを抑え
られ、シール機能を果す。[Function] The protective tube fitted to each end of the exhaust pipe and extension pipe is
Since the seal ring is prevented from being directly exposed to exhaust gas, the seal ring is prevented from sagging due to heat and performs its sealing function.
シールリングはリング幅の延長管の環状溝の溝
幅に対する割合を0.65〜0.9とすることにより、
シールリングは接続部の熱変形に応動し、カーボ
ンの付着による環状溝への固着を抑止される。 The seal ring is made by setting the ratio of the ring width to the groove width of the annular groove of the extension tube to be 0.65 to 0.9.
The seal ring responds to thermal deformation of the connecting portion, and is prevented from adhering to the annular groove due to carbon adhesion.
機関の運転・停止に伴つてシールリングは熱膨
張・収縮するので、排気管の大径円筒部と延長管
の外周面との隙間を常にシールする。排気管と延
長管が径外方へ熱膨張すると、シールリングは排
気管と延長管の熱膨張に対応して膨張し、排気管
の大径円筒部によく密接し、排ガスが外部への洩
れるのを阻止する。 Since the seal ring thermally expands and contracts as the engine starts and stops, it always seals the gap between the large diameter cylindrical part of the exhaust pipe and the outer peripheral surface of the extension pipe. When the exhaust pipe and extension pipe thermally expand radially outward, the seal ring expands in response to the thermal expansion of the exhaust pipe and extension pipe, and comes into close contact with the large diameter cylindrical part of the exhaust pipe, preventing exhaust gas from leaking to the outside. to prevent
［考案の実施例］
第１図に示すように、排気管３例えば排気マニ
ホールドの集合管の端部に径拡大部４が形成さ
れ、径拡大部４の内部に延長管１３が嵌合され
る。このため、排気管３に段部６の部分から内径
が拡大された大径円筒部５が設けられる。延長管
１３の外周面１４に環状溝１６が設けられ、環状
溝１６に嵌合したシールリング１５が、排気管３
の大径円筒部５へ嵌合される。[Embodiment of the invention] As shown in FIG. 1, an enlarged diameter portion 4 is formed at the end of the exhaust pipe 3, for example, a collecting pipe of an exhaust manifold, and an extension pipe 13 is fitted inside the enlarged diameter portion 4. . For this reason, the exhaust pipe 3 is provided with a large diameter cylindrical portion 5 whose inner diameter is enlarged from the stepped portion 6. An annular groove 16 is provided on the outer circumferential surface 14 of the extension pipe 13, and a seal ring 15 fitted in the annular groove 16 connects the exhaust pipe 3.
It is fitted into the large diameter cylindrical part 5 of.
好ましくは、排気管３と延長管１３の端部に、
内周面２，１２よりも僅かに内径を拡大された同
径の内周面７，１７が設けられ、内周面７，１７
に薄肉の保護管１８が嵌合される。保護管１８は
軸方向へ膨張できるように、内周面７，１７の軸
方向長さは保護管１８のそれよりも長くなつてい
る。保護管１８の肉厚は比較的薄く、保護管１８
の内周面１９と排気管３の内周面２と延長管１３
の内周面１２とはほぼ同径である。 Preferably, at the ends of the exhaust pipe 3 and the extension pipe 13,
Inner circumferential surfaces 7, 17 having the same diameter and slightly larger inner diameter than the inner circumferential surfaces 2, 12 are provided, and the inner circumferential surfaces 7, 17
A thin-walled protective tube 18 is fitted into the housing. The axial length of the inner peripheral surfaces 7 and 17 is longer than that of the protective tube 18 so that the protective tube 18 can expand in the axial direction. The wall thickness of the protection tube 18 is relatively thin.
the inner circumferential surface 19 of the exhaust pipe 3, the inner circumferential surface 2 of the exhaust pipe 3, and the extension pipe 13.
It has approximately the same diameter as the inner circumferential surface 12 of.
第２図に示すように、本考案は延長管１３の環
状溝１６の溝幅ｗを、シールリング１５のリング
幅ｓよりも広くし、環状溝１６の深さｔを十分深
くする。これにより、シールリング１５は環状溝
１６の内部で摺動可能であり、排気管３と延長管
１３に対する固着を抑止される。 As shown in FIG. 2, in the present invention, the groove width w of the annular groove 16 of the extension tube 13 is made wider than the ring width s of the seal ring 15, and the depth t of the annular groove 16 is made sufficiently deep. Thereby, the seal ring 15 can slide inside the annular groove 16 and is prevented from sticking to the exhaust pipe 3 and the extension pipe 13.
リング幅3.0mmに対し、溝幅3.1mmである従来の
排気管の接続構造では、排気管の接続部から排ガ
ス洩れが生じるに至るまでの走行時間は、約100
時間（走行距離約10万Km）であつた。 With the conventional exhaust pipe connection structure where the ring width is 3.0mm and the groove width is 3.1mm, it takes about 100 minutes for exhaust gas to leak from the exhaust pipe connection.
time (mileage: approximately 100,000 km).
排気管３は温度変化により膨張・収縮を繰り返
し、排気管３の大径円筒部５と延長管１３の外周
面１４との隙間ｃ（第１図）が変化する。第５図
に示すように、リング幅ｓが狭いと、シールリン
グ１５の張力が不足し、シール性が低下する。ま
た、リング幅ｓと溝幅ｗの隙間（ｗ−ｓ）を小さ
くすると、第４図に示すように、シールリング１
５は熱膨張と収縮を繰り返す内に、機関の停止時
シールリング１５は収縮したまま環状溝１６の底
面に固着しやすくなり、シールリング１５の外周
面と排気管３の大径円筒部５との間に隙間ｅが生
じる。 The exhaust pipe 3 repeatedly expands and contracts due to temperature changes, and the gap c (FIG. 1) between the large diameter cylindrical portion 5 of the exhaust pipe 3 and the outer peripheral surface 14 of the extension pipe 13 changes. As shown in FIG. 5, if the ring width s is narrow, the tension of the seal ring 15 will be insufficient and the sealing performance will deteriorate. Also, if the gap (w-s) between the ring width s and the groove width w is made smaller, the seal ring 1
5 repeats thermal expansion and contraction, and when the engine is stopped, the seal ring 15 tends to stick to the bottom of the annular groove 16 while contracted, and the outer peripheral surface of the seal ring 15 and the large diameter cylindrical part 5 of the exhaust pipe 3 A gap e is created between them.
そこで、本考案では、リング幅ｓと溝幅ｗの関
係について種々実験を重ねた結果、普通の機関に
おける排気管の内径が40〜80mmの場合に、溝幅ｗ
に対するリング幅ｓの場合を0.65〜0.88、さらに
好ましくは約0.8とすることが、シールリング１
５の固着防止に顕著な効果のあることを見い出し
た。リング幅ｓと溝幅ｗとの寸法関係を、上述の
ように規定することにより、第３図に示すよう
に、排ガス洩れが生じるに至る時間は、200時間
を超えるものとなつた。以上はシールリング１５
を１個用いた場合であり、シールリング１５を２
個または３個並列して装着すると、排ガス洩れが
生じるに至る走行距離は、50万Kmを越える。 Therefore, in this invention, as a result of various experiments regarding the relationship between the ring width s and the groove width w, we found that when the inner diameter of the exhaust pipe in a normal engine is 40 to 80 mm, the groove width w
The ring width s for the seal ring 1 is set to 0.65 to 0.88, more preferably about 0.8.
It has been found that this method has a remarkable effect on preventing the adhesion of No. 5. By defining the dimensional relationship between the ring width s and the groove width w as described above, the time required for exhaust gas leakage to occur exceeds 200 hours, as shown in FIG. 3. The above is seal ring 15
This is the case where one seal ring 15 is used, and two seal rings 15 are used.
If one or three are installed in parallel, the mileage before exhaust gas leakage occurs is over 500,000 km.
要するに、従来は溝幅ｗに対するリング幅ｓの
割合は大きい（１に近い）方がシール性が優れる
ものと考えられ、溝幅ｗに対するリング幅ｓの割
合は0.95〜1.0とされていたのであるが、実験の
結果、第４，５図に示すように、従来のものは走
行時間が100時間程度で、シールリング１５の外
周面と排気管３の大径円筒部５との間に隙間ｅが
生じることが明らかになつた。 In short, conventionally, it was thought that the larger the ratio of the ring width s to the groove width w (closer to 1), the better the sealing performance, and the ratio of the ring width s to the groove width w was set at 0.95 to 1.0. However, as a result of experiments, as shown in FIGS. 4 and 5, the conventional type has a running time of about 100 hours, and there is a gap e between the outer peripheral surface of the seal ring 15 and the large diameter cylindrical portion 5 of the exhaust pipe 3. It has become clear that this occurs.
本考案は上述の実験結果に基づき、リング幅ｓ
に対する溝幅ｗを従来よりも広くすることによ
り、排ガス中のカーボンの付着などによるシール
リング１５の固着を長時間にわたり防止できる。 The present invention is based on the above experimental results, and the ring width s
By making the groove width w wider than before, it is possible to prevent the seal ring 15 from sticking for a long time due to adhesion of carbon in the exhaust gas.
機関の繰返し運転・停止に対応して、シールリ
ング１５は熱膨張・収縮し、排気管３の大径円筒
部５と延長管１３の外周面１４との隙間ｃを完全
にシールする。つまり、排気管３と延長管１３と
の接続部において、内周面７，１７の保護管１８
を嵌合してあり、排気管３と延長管１３の熱膨張
率が同等である鋳鉄の場合に、機関の始動初期に
は、保護管１８が内周面７，１７によく密着し、
排ガスがシールリング１５の方へ洩れるのを防止
し、接続部の折曲げに対する強度を維持する。 In response to repeated operation and stop of the engine, the seal ring 15 thermally expands and contracts to completely seal the gap c between the large diameter cylindrical portion 5 of the exhaust pipe 3 and the outer peripheral surface 14 of the extension pipe 13. In other words, at the connection between the exhaust pipe 3 and the extension pipe 13, the protection pipe 18 on the inner peripheral surfaces 7, 17
If the exhaust pipe 3 and the extension pipe 13 are made of cast iron and have the same coefficient of thermal expansion, the protective pipe 18 will come into close contact with the inner circumferential surfaces 7 and 17 at the beginning of engine startup.
This prevents exhaust gas from leaking toward the seal ring 15 and maintains the strength of the connection portion against bending.
一方、暖機終了後は、排気管３と延長管１３が
径外方へ熱膨張すると、シールリング１５も熱膨
張して排気管３の大径円筒部５によく密接し、排
ガスが外部へ洩れるのを防止する。 On the other hand, after warming up, when the exhaust pipe 3 and extension pipe 13 thermally expand radially outward, the seal ring 15 also thermally expands and comes into close contact with the large diameter cylindrical part 5 of the exhaust pipe 3, allowing exhaust gas to flow outside. Prevent leakage.
［考案の効果］
本考案は上述のように、薄肉の保護管に排気管
と延長管の各端部を外嵌し、排気管の端部に形成
した大径円筒部に延長管を嵌合し、延長管の外周
面に設けた環状溝に、外周面が大径円筒部に接す
るシールリングを係合し、シールリングのリング
幅の前記環状溝の溝幅に対する割合を0.65〜0.9
にして、環状溝に溝幅方向に隙間を備えたもので
あり、次のような効果が得られる。[Effects of the invention] As described above, the present invention fits each end of the exhaust pipe and extension pipe into a thin protection pipe, and fits the extension pipe into a large diameter cylindrical part formed at the end of the exhaust pipe. Then, a seal ring whose outer circumferential surface is in contact with the large-diameter cylindrical portion is engaged with an annular groove provided on the outer circumferential surface of the extension tube, and the ratio of the ring width of the seal ring to the groove width of the annular groove is 0.65 to 0.9.
The annular groove is provided with a gap in the groove width direction, and the following effects can be obtained.
排気管と延長管の各接続部の内周面を機械加工
し、延長管の外周面に環状溝を機械加工するだけ
であり、特に保護管の嵌合部についての加工精度
や組立精度が要求されないので、コストが節減さ
れる。 All that is required is machining the inner circumferential surface of each joint between the exhaust pipe and extension pipe, and machining an annular groove on the outer circumferential surface of the extension pipe. Machining accuracy and assembly accuracy are particularly required for the fitting part of the protection tube. This saves costs.
排気管と延長管に保護管を嵌合したことによ
り、延長管の環状溝に係合されたシールリングが
排ガスから保護され、シールリングの劣化が抑え
られる。 By fitting the protection tube to the exhaust pipe and the extension tube, the seal ring engaged in the annular groove of the extension tube is protected from exhaust gas, and deterioration of the seal ring is suppressed.
環状溝の溝幅に対するシールリングのリング幅
の割合を0.65〜0.9にして、環状溝に溝幅方向の
隙間を備えたことにより、シールリングの固着が
抑えられ、シール機能が長期にわたり維持され
る。 By setting the ratio of the ring width of the seal ring to the groove width of the annular groove to 0.65 to 0.9 and providing a gap in the groove width direction in the annular groove, sticking of the seal ring is suppressed and the sealing function is maintained for a long time. .
第１図は本考案に係る排気管の接続構造の下半
部分を省略して示す側面断面図、第２図は同要部
拡大図、第３図は同排気管の接続構造の性能試験
結果を示す線図、第４，５図は従来の排気管の接
続構造の作用を説明する側面断面図である。
３……排気管、５……大径円筒部、１３……延
長管、１５……シールリング、１６……環状溝、
１８……保護管、ｓ……リング幅、ｗ……溝幅。
Fig. 1 is a side sectional view omitting the lower half of the exhaust pipe connection structure according to the present invention, Fig. 2 is an enlarged view of the main part, and Fig. 3 is the performance test result of the exhaust pipe connection structure. FIGS. 4 and 5 are side sectional views illustrating the operation of the conventional exhaust pipe connection structure. 3... Exhaust pipe, 5... Large diameter cylindrical portion, 13... Extension pipe, 15... Seal ring, 16... Annular groove,
18...protection tube, s...ring width, w...groove width.
Claims (1)
し、排気管の端部に形成した大径円筒部に延長管
を嵌合し、延長管の外周面に設けた環状溝に、外
周面が大径円筒部に接するシールリングを係合
し、シールリングのリング幅の前記環状溝の溝幅
に対する割合を0.65〜0.9にして、環状溝に溝幅
方向の隙間を備えたことを特徴とする、排気管の
接続構造。 Fit each end of the exhaust pipe and extension pipe into the thin-walled protection pipe, fit the extension pipe into the large diameter cylindrical part formed at the end of the exhaust pipe, and fit the extension pipe into the annular groove provided on the outer peripheral surface of the extension pipe. , a seal ring whose outer peripheral surface is in contact with the large-diameter cylindrical portion is engaged, and the ratio of the ring width of the seal ring to the groove width of the annular groove is 0.65 to 0.9, and the annular groove is provided with a gap in the groove width direction. An exhaust pipe connection structure featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985070714U JPH0430334Y2 (en) | 1985-05-15 | 1985-05-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985070714U JPH0430334Y2 (en) | 1985-05-15 | 1985-05-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61186722U JPS61186722U (en) | 1986-11-21 |
| JPH0430334Y2 true JPH0430334Y2 (en) | 1992-07-22 |
Family
ID=30607546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985070714U Expired JPH0430334Y2 (en) | 1985-05-15 | 1985-05-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0430334Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005061536A (en) * | 2003-08-13 | 2005-03-10 | Jfe Pipe Fitting Mfg Co Ltd | Heat-resistant pipe joint |
| JP4551753B2 (en) * | 2004-12-21 | 2010-09-29 | Ｊｆｅ継手株式会社 | Heat resistant fittings |
| EP2757291B1 (en) * | 2011-09-13 | 2017-03-29 | Nok Corporation | Gasket and sealing structure |
| JP5887243B2 (en) * | 2012-09-28 | 2016-03-16 | Ｋｙｂ株式会社 | Variable displacement vane pump |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5716682B2 (en) * | 1976-05-06 | 1982-04-06 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6114573Y2 (en) * | 1980-07-02 | 1986-05-07 |
-
1985
- 1985-05-15 JP JP1985070714U patent/JPH0430334Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5716682B2 (en) * | 1976-05-06 | 1982-04-06 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61186722U (en) | 1986-11-21 |
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