JPH0137150Y2 - - Google Patents
Info
- Publication number
- JPH0137150Y2 JPH0137150Y2 JP1981159237U JP15923781U JPH0137150Y2 JP H0137150 Y2 JPH0137150 Y2 JP H0137150Y2 JP 1981159237 U JP1981159237 U JP 1981159237U JP 15923781 U JP15923781 U JP 15923781U JP H0137150 Y2 JPH0137150 Y2 JP H0137150Y2
- Authority
- JP
- Japan
- Prior art keywords
- mounting flange
- exhaust manifold
- mounting
- branch pipe
- manifold
- 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
- 230000002265 prevention Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
Description
【考案の詳細な説明】
本案は内燃機関における排気マニホルド、特に
排気マニホルドのフランジからの排気ガス洩れ防
止に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust manifold in an internal combustion engine, particularly to preventing exhaust gas from leaking from a flange of the exhaust manifold.
多気筒エンジンの各シリンダヘツドの排気孔に
連結する枝管部と、これら枝管部からの排気ガス
を集合させ排気管へ送る集合管部とからなる従来
の排気マニホルドは、第１図に平面図で、第２図
に正面図で示すように、排気マニホルド１の枝管
部２端に形成した取付フランジ３をシリンダヘツ
ド４の取付面４ａに取付ボルト５、ナツト６等を
介して固定する。しかして、エンジン運転時にお
いては高温の排気ガスが排気マニホルド１内を通
過し該排気ガス熱によつて排気マニホルド１は熱
膨張し、特に枝管部２の垂直方向に延在し所定長
さを有する集合管部７の長さ方向への膨張によ
り、第３図に示すように集合管部７の中央部Ｍに
対してそれぞれの取付フランジ３，３…の内方部
分３ａ，３ａ…がシリンダヘツド４の取付面４ａ
より浮き上り、取付フランジ３と取付面４ａとの
間に隙間を生じ、この隙間より排気ガスを漏洩さ
せることがあつた。 A conventional exhaust manifold consists of a branch pipe section that connects to the exhaust hole of each cylinder head of a multi-cylinder engine, and a collecting pipe section that collects exhaust gas from these branch pipe sections and sends it to the exhaust pipe. As shown in the front view in FIG. 2, the mounting flange 3 formed at the end of the branch pipe portion 2 of the exhaust manifold 1 is fixed to the mounting surface 4a of the cylinder head 4 via mounting bolts 5, nuts 6, etc. . During engine operation, high-temperature exhaust gas passes through the exhaust manifold 1, and the exhaust manifold 1 thermally expands due to the heat of the exhaust gas. Due to the expansion in the length direction of the collecting pipe section 7, the inner portions 3a, 3a... of the respective mounting flanges 3, 3... are moved against the central part M of the collecting pipe section 7, as shown in FIG. Mounting surface 4a of cylinder head 4
As a result, a gap was formed between the mounting flange 3 and the mounting surface 4a, and exhaust gas was leaked through this gap.
このため、浮き上り防止手段として、取付ボル
トの数を増加させ、または排気マニホルド全体の
剛性を増大させ、あるいはナツト締付力を増大さ
せる等したが、取付ボルトの数を増すことは排気
マニホルド取付スペース上問題があり、剛性を増
大させることは排気マニホルド亀裂を生じ易くす
る等の難点がある。 For this reason, measures to prevent lifting have been made such as increasing the number of mounting bolts, increasing the rigidity of the entire exhaust manifold, or increasing the nut tightening force. There is a space problem, and increasing the rigidity also makes the exhaust manifold more likely to crack.
本案はこのような事情に鑑み、排気ガス熱によ
る熱膨張に起因する取付フランジの浮き上りを防
止し、シリンダヘツドの取付面と取付フランジと
の間に隙間を形成しないようにして、排気ガスの
漏洩を防止するようにした排気マニホルドを提供
するものであつて、集合管部の長さ方向中央部よ
り両側方に位置する各々の枝管部の取付フランジ
外側に、集合管部の長さ方向中央部に対して対称
状に、取付フランジと枝管部とに亘る肉盛りリブ
状の浮上り防止膨出部を形成してなるものであ
る。 In view of these circumstances, this proposal prevents the mounting flange from rising due to thermal expansion due to exhaust gas heat, and prevents the formation of a gap between the mounting surface of the cylinder head and the mounting flange, thereby reducing exhaust gas emissions. The exhaust manifold is designed to prevent leakage, and the exhaust manifold is provided with an exhaust manifold installed in the longitudinal direction of the collecting pipe on the outside of the mounting flange of each branch pipe located on both sides of the central part of the collecting pipe in the longitudinal direction. A raised rib-like anti-lifting bulge extending between the mounting flange and the branch pipe is formed symmetrically with respect to the center.
本案を４気筒エンジンに適用した場合の実施例
について説明すると、第４図乃至第６図に示すよ
うに、排気マニホルド８は集合管部９と、４つの
枝管部１０，１０，１０，１０とからなり、集合
管部９には排気管（図示しない）と接続自在とす
るフランジ１１を形成し、各枝管部１０，１０…
端にはそれぞれ取付フランジ１２を形成してあ
る。これら取付フランジ１２とシリンダヘツド１
３の取付面１３ａ間にガスケツト等（図示しな
い）を介装させ、取付フランジ１２の取付孔１
４，１４に取付スタツドボルト１５，１５を挿通
し締付ナツト１６，１６により締付けて、シリン
ダヘツド１３に排気マニホルド８を固定する。 To explain an embodiment in which the present invention is applied to a four-cylinder engine, as shown in FIGS. 4 to 6, the exhaust manifold 8 includes a collecting pipe section 9 and four branch pipe sections 10, 10, The collecting pipe part 9 is formed with a flange 11 that can be freely connected to an exhaust pipe (not shown), and each branch pipe part 10, 10...
A mounting flange 12 is formed at each end. These mounting flanges 12 and cylinder head 1
A gasket or the like (not shown) is interposed between the mounting surface 13a of the mounting flange 12, and the mounting hole 1 of the mounting flange 12 is
The exhaust manifold 8 is fixed to the cylinder head 13 by inserting the mounting stud bolts 15, 15 into the cylinder heads 4, 14 and tightening them with the tightening nuts 16, 16.
前記枝管部１０，１０…の取付フランジ１２の
外側端、即ち前記集合管部９の長さ方向中央部Ｍ
に対し外方に位置する外側端１２ａには浮き上り
防止膨出部１７を形成してある。この浮き上り防
止膨出部１７は第５図および第６図に示すように
端面１７ａと取付フランジ１２の取付面１２ｂと
同一平面状とし、枝管部１０に沿つて立上り延び
るとともに集合管部９の長さ方向中央部Ｍより遠
他点側取付フランジ１２の外方に膨出し、取付フ
ランジ１２と枝管部１０とに亘つて恰も肉盛りリ
ブ状に形成してある。 The outer ends of the mounting flanges 12 of the branch pipe parts 10, 10, . . . , the central part M in the length direction of the collecting pipe part 9
An anti-lifting bulge 17 is formed at the outer end 12a located outward. As shown in FIGS. 5 and 6, this anti-lifting bulge 17 is flush with the end surface 17a and the mounting surface 12b of the mounting flange 12, and extends upright along the branch pipe section 10, and extends from the collecting pipe section 9. The mounting flange 12 on the far point side bulges outward from the central portion M in the length direction, and is formed in the shape of a built-up rib extending over the mounting flange 12 and the branch pipe portion 10.
本案は前記のように構成するから、エンジン運
転時等、排気ガス熱により集合管部９が長さ方向
に熱膨張しても、枝管部１０，１０…端の取付フ
ランジ１２シリンダヘツド１３の取付面１３ａよ
り浮上せしめない。 Since the present invention is configured as described above, even if the collecting pipe section 9 thermally expands in the length direction due to exhaust gas heat during engine operation, etc., the mounting flanges 12 at the ends of the branch pipe sections 10, 10... Do not let it float above the mounting surface 13a.
即ち、第６図に示すようにシリンダヘツド１３
の取付面１３ａと集合管部９の軸心との距離をl1
とし、熱膨張により集合管部９内に生ずる膨張力
をＰとした場合、締付ナツト１６による締付力Ｆ
の取付フランジ１２への作用点Ｓに対してＰ×l1
なるモーメントが作用し、これに対し前記作用点
Ｓから浮き上り防止膨出部１７の基部外端までの
距離をl2とすると、浮き上り防止膨出部１７の外
端を支点としＦ×l2なるモーメントが作用し、取
付フランジ１２のモーメントＰ×l1がモーメント
Ｆ×l2より大きくなると、取付フランジ１２はそ
の外端を支点として内側端の部分１２ccが浮き上
り、取付フランジ１２とシリンダヘツド１３の取
付面１３ａ間に隙間を生ずるが、本案においては
取付フランジ１２の外側端１２ａに浮き上り防止
膨出部１７を形成して前記l2を長くしたので、モ
ーメントＦ×l2が従来に比べて大きくなりモーメ
ントＰ×l1に抗するので、取付フランジ１２の浮
き上りが防止される。 That is, as shown in FIG.
The distance between the mounting surface 13a and the axis of the collecting pipe section 9 is l 1
If the expansion force generated in the collecting pipe section 9 due to thermal expansion is P, then the tightening force F by the tightening nut 16 is
P×l 1 with respect to the point of action S on the mounting flange 12
A moment of 2 moment acts on the mounting flange 12, and when the moment P×l 1 of the mounting flange 12 becomes larger than the moment F×l 2 , the inner end portion 12cc of the mounting flange 12 lifts up using its outer end as a fulcrum, and the mounting flange 12 and the cylinder Although a gap is created between the mounting surfaces 13a of the head 13, in this case, the lifting-preventing bulge 17 is formed on the outer end 12a of the mounting flange 12 to lengthen the above-mentioned l 2 , so that the moment F×l 2 is smaller than the conventional one. , and resists the moment P×l 1 , thereby preventing the mounting flange 12 from lifting up.
第７図は枝管部を２つとした場合、第８図は枝
管部を３つとした場合の本案排気マニホルドの実
施例を示し、第９図および第１０図に示すものは
前マニホルド１８と後マニホルド１９を連結して
なる排気マニホルドの場合であつて、このような
連結マニホルドの場合には前マニホルド１８、後
マニホルド１９にそれぞれ本案を適用したもので
ある。 FIG. 7 shows an embodiment of the exhaust manifold according to the present invention when the number of branch pipes is two, and FIG. 8 shows an embodiment of the exhaust manifold according to the present invention when the number of branch pipes is three. In the case of an exhaust manifold formed by connecting the rear manifold 19, the present invention is applied to the front manifold 18 and the rear manifold 19, respectively, in the case of such a connected manifold.
なお、前記実施例においては浮き上り防止膨出
部を取付フランジと枝管部とに亘り肉盛りリブ状
として形成したが、第１１図に示すように浮き上
り防止膨出部を外側に一体形成してもよく、この
場合の作用、効果は前記実施例と同様である。 In the above embodiment, the lifting-preventing bulge was formed in the form of a built-up rib over the mounting flange and the branch pipe part, but as shown in Fig. 11, the lifting-preventing bulging part was formed integrally on the outside. The operation and effect in this case are the same as those in the above embodiment.
本案排気マニホルドは、排気ガス熱により熱膨
張しても、浮き上り防止膨出部により取付フラン
ジにシリンダヘツドの取付面方向へ押圧する大き
なモーメントを作用せしめるので、排気マニホル
ドにおける取付フランジの浮き上りを防止し、封
止を確実にして取付フランジとシリンダヘツドの
取付面間の排気ガス漏洩を防止する等、幾多の実
用的効果を発揮する。 Even if the exhaust manifold of this invention expands thermally due to exhaust gas heat, the lifting-preventing bulge applies a large moment to the mounting flange in the direction of the mounting surface of the cylinder head, so that lifting of the mounting flange in the exhaust manifold is prevented. It has many practical effects, such as preventing leakage of exhaust gas between the mounting flange and the mounting surface of the cylinder head by ensuring sealing.
第１図は従来の排気マニホルドの取付状態を示
す平面図、第２図は同正面図、第３図は従来の排
気マニホルドの熱膨張後の変形状態を示す説明
図、第４図は本案排気マニホルドの取付状態にお
ける平面図、第５図は第４図Ａ−Ａ線視相当断面
図、第６図は本案排気マニホルドにおける取付フ
ランジの浮き上り防止作用説明図、第７図、第８
図、第９図および第１０図かそれぞれ本案排気マ
ニホルドの他の実施例を示す平面図、第１１図は
本案排気マニホルドの変形例を示す要部断面図で
ある。
１，８……排気マニホルド、２，１０……枝管
部、３，１２……取付フランジ、４，１３……シ
リンダヘツド、５，１５……スタツドボルト、
６，１６……締付ナツト、７，９……集合管部、
１７……浮き上り防止膨出部、１８……前マニホ
ルド、１９……後マニホルド。
Fig. 1 is a plan view showing the installed state of a conventional exhaust manifold, Fig. 2 is a front view of the same, Fig. 3 is an explanatory diagram showing the deformed state of the conventional exhaust manifold after thermal expansion, and Fig. 4 is an exhaust of the present invention. A plan view of the manifold in the installed state, FIG. 5 is a sectional view corresponding to the line A-A in FIG.
9 and 10 are respectively plan views showing other embodiments of the exhaust manifold of the present invention, and FIG. 11 is a sectional view of essential parts showing a modification of the exhaust manifold of the present invention. 1, 8... Exhaust manifold, 2, 10... Branch pipe section, 3, 12... Mounting flange, 4, 13... Cylinder head, 5, 15... Stud bolt,
6, 16... Tightening nut, 7, 9... Collection pipe section,
17... Lifting prevention bulge, 18... Front manifold, 19... Rear manifold.
Claims (1)
る各々の枝管部の取付フランジ外側に、集合管部
の長さ方向中央部に対して対称状に、取付フラン
ジと枝管部とに亘る肉盛りリブ状の浮上り防止膨
出部を形成してなる排気マニホルド。 On the outside of the mounting flange of each branch pipe section located on both sides of the central part of the collecting pipe part in the longitudinal direction, the mounting flange and the branch pipe part are installed symmetrically with respect to the central part in the longitudinal direction of the collecting pipe part. An exhaust manifold formed with a floating prevention bulge in the form of a built-up rib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15923781U JPS5863318U (en) | 1981-10-26 | 1981-10-26 | exhaust manifold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15923781U JPS5863318U (en) | 1981-10-26 | 1981-10-26 | exhaust manifold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5863318U JPS5863318U (en) | 1983-04-28 |
| JPH0137150Y2 true JPH0137150Y2 (en) | 1989-11-09 |
Family
ID=29951699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15923781U Granted JPS5863318U (en) | 1981-10-26 | 1981-10-26 | exhaust manifold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5863318U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7196829B2 (en) * | 2019-12-26 | 2022-12-27 | トヨタ自動車株式会社 | Exhaust manifold mounting structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5399411U (en) * | 1977-01-18 | 1978-08-11 | ||
| JPS6119013Y2 (en) * | 1980-04-24 | 1986-06-09 |
-
1981
- 1981-10-26 JP JP15923781U patent/JPS5863318U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5863318U (en) | 1983-04-28 |
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