JPH0544508Y2 - - Google Patents
Info
- Publication number
- JPH0544508Y2 JPH0544508Y2 JP10456388U JP10456388U JPH0544508Y2 JP H0544508 Y2 JPH0544508 Y2 JP H0544508Y2 JP 10456388 U JP10456388 U JP 10456388U JP 10456388 U JP10456388 U JP 10456388U JP H0544508 Y2 JPH0544508 Y2 JP H0544508Y2
- Authority
- JP
- Japan
- Prior art keywords
- heat shield
- shield plate
- top surface
- exhaust manifold
- boss portion
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000008602 contraction Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
Landscapes
- Exhaust Silencers (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、内燃機関の排気マニホルド用遮熱板
の取付構造に関し、とくに排気マニホルドに突出
形成されたボス部にボルトにより遮熱板を取付け
る部位の構造に関する。[Detailed description of the invention] [Field of industrial application] The present invention relates to a mounting structure for a heat shield plate for an exhaust manifold of an internal combustion engine, and in particular, the heat shield plate is attached to a boss portion formed protruding from the exhaust manifold with bolts. Regarding the structure of the part.
内燃機関の排気マニホルドは、周囲の機器への
熱害防止やエンジンルームの高温化防止のため
に、通常遮熱板で覆われる。この遮熱板は、一般
に、極力排気マニホルドからの伝熱を抑え、又遮
熱板に遮音効果もたせるために、排気マニホルド
との間の大部分が空間に形成されるように、排気
マニホルドに取付用ボス部を突出形成し、そのボ
ス部頂面上にボルト等を介して取付けられる。
The exhaust manifold of an internal combustion engine is usually covered with a heat shield to prevent heat damage to surrounding equipment and to prevent the engine room from becoming too hot. Generally, this heat shield plate is attached to the exhaust manifold so that most of the space between it and the exhaust manifold is formed in order to suppress heat transfer from the exhaust manifold as much as possible and to give the heat shield plate a sound insulation effect. A boss portion is formed to protrude and is attached to the top surface of the boss portion via a bolt or the like.
この部分の従来構造として、たとえば第４図に
示すように、排気マニホルドに突出形成されたボ
ス部１の頂面２上に、ボルト３により遮熱板４を
直接取付けるか、あるいは第５図に示すように、
遮熱板５のボルト穴内周から遮熱板の両面側へと
わたるグロメツト６を介装し、ボルト７によりボ
ス部８の頂面上に締結する構造が知られている。 As for the conventional structure of this part, for example, as shown in Fig. 4, a heat shield plate 4 is directly attached with bolts 3 onto the top surface 2 of a boss part 1 formed protruding from the exhaust manifold, or as shown in Fig. 5. As shown,
A structure is known in which a grommet 6 extending from the inner periphery of the bolt hole of the heat shield plate 5 to both sides of the heat shield plate is interposed and fastened to the top surface of the boss portion 8 with a bolt 7.
また、実開昭58−70416号公報には、ボス部頂
面と遮熱板との間に円板状の補強部材を介装する
構造が開示されており、実開昭60−122524号公報
には、ボルトの緩み防止構造として、ボス部頂面
上で遮熱板をボルトヘツド側に予め段状に突出さ
せておき、その突出部をボルト締付けに伴い平坦
形状に押圧する構造が開示されている。 Further, Japanese Utility Model Application Publication No. 58-70416 discloses a structure in which a disk-shaped reinforcing member is interposed between the top surface of a boss portion and a heat shield plate, and Japanese Utility Model Application Publication No. 60-122524 discloses a structure for preventing loosening of bolts, in which a heat shield is made to protrude in advance in a stepped manner on the top surface of the boss toward the bolt head, and the protruding portion is pressed into a flat shape as the bolt is tightened. There is.
上述の第４図あるいは第５図に示した従来構造
においては、機関の振動あるいは冷熱サイクルに
より、遮熱板本体に曲げおよび引張り、圧縮が作
用し、その応力が締結部近傍に集中するおそれが
ある。とくに、遮熱板本体の締結固定部と解放部
との境界である、ボス部頂面端縁に相当する部位
（第４図）、グロメツト端縁に相当する部位（第５
図）に応力が集中しこの部位の強度が不足するお
それがある。強度が不足すると、亀裂９，１０発
生の原因となる。
In the conventional structure shown in Fig. 4 or Fig. 5 above, engine vibration or cooling/heating cycles cause bending, tension, and compression to act on the heat shield body, and the stress may be concentrated near the fastening parts. be. In particular, the area corresponding to the top edge of the boss part (Fig. 4) and the area corresponding to the grommet edge (Fig.
There is a risk that stress will be concentrated in the area shown in the figure) and the strength of this area will be insufficient. Insufficient strength causes cracks 9 and 10 to occur.
このような問題に対し、実開昭58−70416号公
報開示の円板状の補強部材を設けるだけでは、遮
熱板自身の強度、とくに冷熱サイクルに伴つて生
じるボルト締結部周囲の局部応力に対する強度が
不足するおそれがある。また、実開昭60−122524
号公報開示の構造では、ボルトの緩み止めには効
果があるものの、基本的に遮熱板の強度向上ある
いは局部応力の緩和は期待できない。 To deal with such problems, simply providing the disk-shaped reinforcing member disclosed in Japanese Utility Model Application Publication No. 58-70416 will not improve the strength of the heat shield itself, especially the local stress around the bolted joints caused by the cooling/heating cycle. There is a risk that the strength will be insufficient. Also, Utsukai Showa 60-122524
Although the structure disclosed in the publication is effective in preventing bolts from loosening, it cannot be expected to basically improve the strength of the heat shield plate or alleviate local stress.
本考案は、上記第４図および第５図に示したよ
うな問題に鑑み、ボルト締結部周囲の遮熱板の強
度を実質的に向上し、この部位の亀裂等の発生の
おそれを除去することを目的とする。 In view of the problems shown in FIGS. 4 and 5 above, the present invention substantially improves the strength of the heat shield around the bolted joint and eliminates the possibility of cracks occurring in this area. The purpose is to
この目的に沿う本考案の排気マニホルド遮熱板
の取付構造は、内燃機関の排気マニホルドを覆う
形状を有し、排気マニホルドに突出形成されたボ
ス部の頂面上にボルトにより取付けられる遮熱板
の取付構造において、前記遮熱板のボルト穴部
に、遮熱板とボス部頂面との間に位置するフラン
ジ部がボス部頂面径よりも大径のグロメツトを装
着するとともに、前記遮熱板のボルト穴周囲に、
遮熱板自身か遮熱板のいずれか一方の面側に湾曲
突出する円環状のリブを形成したものから成る。
The exhaust manifold heat shield mounting structure of the present invention that meets this purpose has a shape that covers the exhaust manifold of an internal combustion engine, and is a heat shield that is attached by bolts to the top surface of a boss portion formed protruding from the exhaust manifold. In the mounting structure, a grommet is installed in the bolt hole portion of the heat shield plate, and the flange portion located between the heat shield plate and the top surface of the boss portion has a diameter larger than the diameter of the top surface of the boss portion. Around the bolt holes of the hot plate,
It consists of an annular rib that curves and protrudes from either the heat shield itself or the surface of the heat shield.
このような取付構造においては、遮熱板とボス
部頂面との間に介装されるグロメツトの一方のフ
ランジ部がボス部頂面径よりも大径に形成されて
いるので、遮熱板がボス部頂面の肩部から直接的
に曲げ応力を受けることはなく、かつ広い面積の
グロメツトにより裏打ちされることになるので、
この部位の剛性が高められる。剛性向上の結果、
とくに、振動等による曲げ応力が低減される。ま
た、ボルト穴周囲に形成された円環状リブは、自
身の湾曲形状によつて、冷熱サイクルによりボル
ト穴周囲に放射線方向に生じる引張り、圧縮によ
る伸縮を吸収するので、局部的な引張り、圧縮応
力が緩和される。さらにこの円環状リブは、同時
に、湾曲リブ形状により遮熱板自身の剛性、とく
に曲げに対する剛性を高める作用もなす。
In such a mounting structure, one flange part of the grommet interposed between the heat shield plate and the top surface of the boss part is formed to have a larger diameter than the diameter of the top face of the boss part, so the heat shield plate is not directly subjected to bending stress from the shoulder on the top surface of the boss, and is backed by a grommet with a wide area.
The rigidity of this part is increased. As a result of improved rigidity,
In particular, bending stress due to vibration etc. is reduced. In addition, the annular rib formed around the bolt hole absorbs the expansion and contraction due to tension and compression that occurs in the radial direction around the bolt hole due to thermal cycles due to its own curved shape. is alleviated. Furthermore, the annular rib also has the effect of increasing the rigidity of the heat shield plate itself, especially the rigidity against bending, due to the curved rib shape.
したがつて、大径のグロメツト、円環状のリブ
の同時実施により、遮熱板のボルト締結部および
その周囲の剛性が飛躍的に高められるとともに、
局部応力が低減される。 Therefore, by simultaneously implementing large-diameter grommets and annular ribs, the rigidity of the bolted parts of the heat shield plate and their surroundings can be dramatically increased, and
Local stress is reduced.
以下に、本考案の望ましい実施例を、図面を参
照して説明する。
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
第１図および第２図は、本考案の一実施例に係
る排気マニホルド遮熱板の取付構造を示してい
る。図において、１１は内燃機関の排気マニホル
ドを示しており、排気マニホルド１１は遮熱板１
２に覆われている。排気マニホルド１１には、遮
熱板１２取付けのためのボス部１３が適当数突出
形成されており、ボス部１３中央部にボルトねじ
穴１４が形成されている。遮熱板１２は、このボ
ス部１３の頂面１３ａ上にボルト１５により取付
けられる。 1 and 2 show a mounting structure for an exhaust manifold heat shield plate according to an embodiment of the present invention. In the figure, 11 indicates an exhaust manifold of an internal combustion engine, and the exhaust manifold 11 is a heat shield plate 1.
It is covered by 2. The exhaust manifold 11 has an appropriate number of protruding boss portions 13 for attaching the heat shield plate 12, and a bolt screw hole 14 is formed in the center of the boss portion 13. The heat shield plate 12 is attached to the top surface 13a of the boss portion 13 with bolts 15.
遮熱板１２は、本実施例では、遮音対策のため
２枚重ねの板状体１２ａ，１２ｂからなつてお
り、内側の板状体１２ｂの端縁部を適当部位にて
折り返すことにより（折り返し部１６）、両板状
体が互に一体的に保持し合つている。遮熱板１２
のボルト穴１７には、グロメツト１８が装着され
ている。このグロメツト１８は、フランジ付円筒
状体からなるものをボルト穴１７に挿入し、円筒
部を遮熱板１２の一方側の面上にフランジ状にカ
シめることにより装着されている。グロメツト１
８のうち、遮熱板１２とボス部１３の頂面１３ａ
との間に位置するフランジ部１８ａは、その外径
d2がボス部面径d1よりも大きくなるように形成さ
れている。 In this embodiment, the heat shield plate 12 is made up of two stacked plate bodies 12a and 12b for sound insulation, and is made by folding back the edge of the inner plate body 12b at an appropriate location. 16), both plate-shaped bodies are integrally held together. Heat shield plate 12
A grommet 18 is attached to the bolt hole 17. The grommet 18 is attached by inserting a flanged cylindrical body into the bolt hole 17 and caulking the cylindrical part onto one surface of the heat shield plate 12 in the form of a flange. Grommet 1
8, the heat shield plate 12 and the top surface 13a of the boss portion 13
The flange portion 18a located between the
The boss portion surface diameter d 2 is larger than the boss portion surface diameter d 1 .
遮熱板１２のボルト穴１７周囲には、遮熱板自
身が遮熱板のいずれか一方の面側（本実施例では
反ボス部側）に湾曲突出する円環状のリブ１９が
形成されている。リブ１９の円環径d3は、本実施
例のようにグロメツト１８の外径d2よりも大に設
定することが好ましいが、それよりも小さい径で
あつてもよい。 Around the bolt holes 17 of the heat shield plate 12, an annular rib 19 is formed so that the heat shield plate itself curves and protrudes toward one side of the heat shield plate (in this embodiment, the side opposite to the boss portion). There is. Although the annular diameter d 3 of the rib 19 is preferably set larger than the outer diameter d 2 of the grommet 18 as in this embodiment, it may be smaller.
なお、ボス部１３の頂面１３ａ上に形成された
皿状の空間２０は、ボルト１５の緩み止めのため
の逃げである。 Note that the dish-shaped space 20 formed on the top surface 13a of the boss portion 13 is a relief for preventing the bolt 15 from loosening.
上記のように構成された実施例装置の作用につ
いて説明する。 The operation of the embodiment device configured as described above will be explained.
遮熱板１２取付部には、第２図に示すように、
機関の振動を主要因とする曲げＭが作用する。し
かし、遮熱板１２とボス部頂面１３ａとの間には
ボス部頂面径d1よりも大径のグロメツト１８のフ
ランジ部１８ａが介装されているので、この部分
の遮熱板１２は従来よりも広い面積で受けられる
ことになり、グロメツト１８で補強されて結果的
に遮熱板１２の剛性が向上される。したがつて曲
げに対し変形しにくくなり、遮熱板１２の曲げ応
力が低減される。 As shown in FIG. 2, the heat shield plate 12 mounting part is provided with
Bending M is caused mainly by engine vibration. However, since the flange portion 18a of the grommet 18, which has a larger diameter than the diameter d1 of the boss portion top surface, is interposed between the heat shield plate 12 and the boss top surface 13a, the heat shield plate 18a of this portion The heat shield plate 12 can be received over a wider area than before, and is reinforced by the grommet 18, resulting in an improvement in the rigidity of the heat shield plate 12. Therefore, it becomes difficult to deform due to bending, and the bending stress of the heat shield plate 12 is reduced.
また、ボルト穴１７周囲には、冷熱サイクルに
伴う熱膨張、収縮により、第３図に示すように、
放射線方向に引張り、圧縮Ａが生じ、局部的な引
張り、圧縮応力が作用する。しかし、ボルト穴１
７周囲には円環状のリブ１９が形成されているの
で、上記引張り、圧縮に伴う遮熱板１２の局部的
な伸縮がリブ１９の湾曲形状により自然に吸収さ
れる。その結果、局部的に過大な引張り、圧縮応
力が生じることが防止されるとともに、上記伸縮
の吸収により応力自身も低く抑えられる。 In addition, as shown in FIG. 3, the area around the bolt hole 17 is caused by thermal expansion and contraction associated with the cooling and heating cycle.
Tension and compression A occur in the radial direction, and local tension and compression stress acts. However, bolt hole 1
Since an annular rib 19 is formed around the heat shield plate 7 , the local expansion and contraction of the heat shield plate 12 due to the above-mentioned tension and compression is naturally absorbed by the curved shape of the rib 19 . As a result, locally excessive tensile and compressive stress is prevented from being generated, and the stress itself is suppressed to a low level by absorbing the expansion and contraction.
したがつて本考案の排気マニホルド遮熱板の取
付構造によるときは、ボス部頂面径よりも大径の
グロメツトで遮熱板の取付部の剛性を高めると同
時に、円環状のリブにより冷熱サイクルに伴う遮
熱板の伸縮変形を吸収しかつ曲げ剛性もさらに高
めることができるようにしたので、遮熱板取付部
の局部的な応力を大幅にかつ確実に低減してこの
部分における亀裂発生のおそれを解消でき、遮熱
板の耐久性を大幅に向上することができる。
Therefore, when using the exhaust manifold heat shield mounting structure of the present invention, the rigidity of the heat shield mounting part is increased by the grommet having a diameter larger than the diameter of the top surface of the boss part, and at the same time, the annular rib prevents the cooling and heating cycle. This technology absorbs the expansion and contraction deformation of the heat shield caused by heat shields and further increases the bending rigidity, thereby significantly and reliably reducing the local stress at the heat shield mounting area and preventing cracks from occurring in this area. It is possible to eliminate this fear and to significantly improve the durability of the heat shield plate.
第１図は本考案の一実施例に係る排気マニホル
ド遮熱板の取付構造の透視斜視図、第２図は第１
図の−線に沿う拡大部分縦断面図、第３図は
第２図の装置のボルト穴周囲の部分平面図、第４
図は従来の取付構造に係るボス部周りの断面図、
第５図は従来の別の取付構造に係るボス部周りの
断面図、である。
１１……排気マニホルド、１２……遮熱板、１
３……ボス部、１３ａ……ボス部頂面、１５……
ボルト、１７……ボルト穴、１８……グロメツ
ト、１８ａ……グロメツトのフランジ部、１９…
…円環状のリブ。
FIG. 1 is a perspective view of a mounting structure for an exhaust manifold heat shield according to an embodiment of the present invention, and FIG.
Fig. 3 is a partial plan view of the device in Fig. 2 around the bolt hole;
The figure is a cross-sectional view around the boss part related to the conventional mounting structure.
FIG. 5 is a sectional view around the boss portion of another conventional mounting structure. 11... Exhaust manifold, 12... Heat shield plate, 1
3...Boss part, 13a...Boss part top surface, 15...
Bolt, 17... Bolt hole, 18... Grommet, 18a... Grommet flange, 19...
...A circular rib.
Claims (1)
排気マニホルドに突出形成されたボス部の頂面上
にボルトにより取付けられる遮熱板の取付構造に
おいて、前記遮熱板のボルト穴部に、遮熱板とボ
ス部頂面との間に位置するフランジ部がボス部頂
面径よりも大径のグロメツトを装着するととも
に、前記遮熱板のボルト穴周囲に、遮熱板自身か
遮熱板のいずれか一方の面側に湾曲突出する円環
状のリブを形成したことを特徴とする排気マニホ
ルド遮熱板の取付構造。 It has a shape that covers the exhaust manifold of an internal combustion engine,
In the mounting structure for a heat shield plate that is attached by bolts to the top surface of a boss portion formed protruding from an exhaust manifold, a heat shield plate is installed in a bolt hole portion of the heat shield plate between the heat shield plate and the top surface of the boss portion. A grommet with a flange portion having a diameter larger than the top surface diameter of the boss portion is attached, and a circular annular grommet that curves and protrudes toward either the heat shield itself or one side of the heat shield plate is installed around the bolt hole of the heat shield plate. An exhaust manifold heat shield mounting structure characterized by forming ribs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10456388U JPH0544508Y2 (en) | 1988-08-09 | 1988-08-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10456388U JPH0544508Y2 (en) | 1988-08-09 | 1988-08-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0226721U JPH0226721U (en) | 1990-02-21 |
| JPH0544508Y2 true JPH0544508Y2 (en) | 1993-11-11 |
Family
ID=31336394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10456388U Expired - Lifetime JPH0544508Y2 (en) | 1988-08-09 | 1988-08-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0544508Y2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2672682B2 (en) * | 1990-02-20 | 1997-11-05 | 株式会社東芝 | Automatic recovery device |
| JP3064673B2 (en) * | 1992-05-30 | 2000-07-12 | スズキ株式会社 | Exhaust manifold cover for vehicle |
| JPH1030436A (en) * | 1996-07-16 | 1998-02-03 | Sanwa Packing Kogyo Kk | Heat insulator and its manufacture |
| JP3449161B2 (en) * | 1997-03-27 | 2003-09-22 | トヨタ自動車株式会社 | Exhaust manifold insulator |
| DE102006003229A1 (en) * | 2006-01-24 | 2007-08-02 | Federal-Mogul Sealing Systems Gmbh | Heat shield, for exhaust gas manifold, for example, consists of several elements which at least partially overlap one another, wherein in overlapping region the elements are fixed at least in places but can move relative to one another |
| FR2949821B1 (en) * | 2009-09-10 | 2011-09-30 | Snecma | ENGINE FUSEE DIVERGENT DEPLOYABLE |
-
1988
- 1988-08-09 JP JP10456388U patent/JPH0544508Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0226721U (en) | 1990-02-21 |
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