JPH06691Y2 - Gasket for cylinder head cover - Google Patents
Gasket for cylinder head coverInfo
- Publication number
- JPH06691Y2 JPH06691Y2 JP1988030192U JP3019288U JPH06691Y2 JP H06691 Y2 JPH06691 Y2 JP H06691Y2 JP 1988030192 U JP1988030192 U JP 1988030192U JP 3019288 U JP3019288 U JP 3019288U JP H06691 Y2 JPH06691 Y2 JP H06691Y2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder head
- bolt
- head cover
- gasket
- peripheral wall
- 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
Landscapes
- Gasket Seals (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 この考案は、内燃期間のシリンダヘッドカバー（ロッカ
カバー）とシリンダヘッドとの間に介装されるシリンダ
ヘッドカバー用ガスケットの改良に関する。Description: TECHNICAL FIELD The present invention relates to an improvement of a cylinder head cover gasket interposed between a cylinder head cover (rocker cover) and a cylinder head during an internal combustion period.
従来の技術 シリンダヘッド上面に装着されるシリンダヘッドカバー
は、その周囲のフランジを貫通した複数のボルトによっ
てシリンダヘッドに固定されるもので、両者間に介在す
るゴムもしくは合成樹脂からなる枠状のガスケットによ
って潤滑油やブローバイガス等のシールがなされている
（特開昭６２−６３１６０号公報等参照）。2. Description of the Related Art A cylinder head cover mounted on the upper surface of a cylinder head is fixed to the cylinder head by a plurality of bolts penetrating a flange around the cylinder head cover, and a frame-shaped gasket made of rubber or synthetic resin interposed between the two. Lubricating oil and blow-by gas are sealed (see Japanese Patent Laid-Open No. 62-63160).
第９図および第１０図は、従来におけるシリンダヘッド
カバー用ガスケット１の一構成例を示しており、このガ
スケット１は、シリンダヘッド２上面とシリンダヘッド
カバー３下面との間で挾圧される断面矩形の帯状をなす
基部４を主体とし、かつその上面に逆Ｔ字状に脚部５が
突設されている。この脚部５は、シリンダヘッドカバー
３側に形成された図示せぬ凹溝内に嵌合し、これによっ
てガスケット１がシリンダヘッドカバー３に保持される
とともに、該シリンダヘッドカバー３側との間のシール
がなされるようになっている。FIG. 9 and FIG. 10 show an example of the configuration of a conventional cylinder head cover gasket 1. This gasket 1 has a rectangular cross section that is pressed between the upper surface of the cylinder head 2 and the lower surface of the cylinder head cover 3. A base portion 4 in the form of a belt is mainly used, and a leg portion 5 is projectingly provided in an inverted T shape on the upper surface thereof. The leg portion 5 is fitted in a recessed groove (not shown) formed on the cylinder head cover 3 side, whereby the gasket 1 is held by the cylinder head cover 3 and a seal between the gasket 1 and the cylinder head cover 3 side is provided. It is supposed to be done.
また、ボルト６が貫通する部分では、基部４が略円形に
膨出形成されているとともに、その上面に略円筒状の周
壁部７が形成されている。すなわち、上記周壁部７は、
ボルト貫通孔８の周囲を囲むように形成され、かつその
一部が上記脚部５に連続している。In addition, at the portion where the bolt 6 penetrates, the base portion 4 is bulged and formed in a substantially circular shape, and a substantially cylindrical peripheral wall portion 7 is formed on the upper surface thereof. That is, the peripheral wall portion 7 is
It is formed so as to surround the periphery of the bolt through hole 8, and a part thereof is continuous with the leg portion 5.
一方、シリンダヘッドカバー３側には、ボルト貫通孔９
を有するボス部１０の下面に、略円筒状の周壁部収容凹
部１１が形成されており、ここに上記周壁部７が比較的
密に嵌合するようになっている。ここで上記ガスケット
１側のボルト貫通孔８の内径およびシリンダヘッドカバ
ー３側のボルト貫通孔９の内径は、ボルト６の径よりも
一回り大きく設定されている。これは、仮に両者が等し
いと、シリンダヘッドカバー３の歪みやそり等によって
ボルト６の挿入，締付が不可能となる虞れがあり、しか
もボルト６の抜き差しによってガスケット１が傷付き、
そこから破断してしまうことがあるため、ボルト６周囲
に若干の隙間を確保するようにしているのである。On the other hand, on the cylinder head cover 3 side, the bolt through hole 9
A substantially cylindrical peripheral wall accommodating concave portion 11 is formed on the lower surface of the boss portion 10 having the above-mentioned shape, and the peripheral wall portion 7 is fitted into the concave concave portion 11 relatively relatively. Here, the inner diameter of the bolt through hole 8 on the gasket 1 side and the inner diameter of the bolt through hole 9 on the cylinder head cover 3 side are set to be slightly larger than the diameter of the bolt 6. This is because if the two are equal, there is a risk that the bolt 6 cannot be inserted or tightened due to distortion or warpage of the cylinder head cover 3, and the gasket 1 is damaged when the bolt 6 is removed or inserted.
Since it may be broken from there, a slight gap is secured around the bolt 6.
尚、上記ボルト貫通孔８と同心状に基部４下面に環状突
起１２が形成されており、シリンダヘッド２上面に沿っ
てボルト貫通孔８内周側へ潤滑油等が漏洩してくるのを
阻止している。An annular projection 12 is formed on the lower surface of the base 4 concentrically with the bolt through hole 8 to prevent lubricating oil and the like from leaking to the inner peripheral side of the bolt through hole 8 along the upper surface of the cylinder head 2. is doing.
また上記周壁部７の自由状態における高さは、周壁部収
容凹部１１の深さよりも若干大きく、従ってボルト６を
締め付けて行くと、第１１図に示すように、周壁部７が
周壁部収容凹部１１の底面により圧縮された状態となっ
てボルト貫通孔９周囲がシールされるようになってい
る。Further, the height of the peripheral wall portion 7 in the free state is slightly larger than the depth of the peripheral wall portion recessed portion 11, and therefore, when the bolt 6 is tightened, the peripheral wall portion 7 is moved to the peripheral wall portion recessed portion as shown in FIG. The bottom surface of 11 is compressed to seal the periphery of the bolt through hole 9.
考案が解決しようとする課題 しかしながら上記のような従来のシリンダヘッドカバー
用ガスケット１にあっては、周壁部７の上端部がボルト
６の締付に伴い第１１図に示すように内周側に倒れ込ん
でしまう現象を生じ、シリンダヘッドカバー３側の周壁
部収容凹部１１内周面との間に隙間が発生してシール性
が低下するという欠点がある。具体的には、ボルト６頭
部周囲から潤滑油のにじみやブローバイガスの漏れが生
じ易い。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional cylinder head cover gasket 1 as described above, the upper end portion of the peripheral wall portion 7 falls toward the inner peripheral side as shown in FIG. However, there is a drawback in that a gap is generated between the cylinder head cover 3 side and the inner peripheral surface of the peripheral wall portion accommodating recess 11 and the sealing performance is deteriorated. Specifically, bleeding of lubricating oil and leakage of blow-by gas are likely to occur around the head of the bolt 6.
これは、上記周壁部７の肉厚を大きく設定した場合には
それほど問題とならないが、近年、自動車用機関等の小
型軽量化に伴い、シリンダヘッドカバー３が小型化，薄
肉化され、従ってガスケット１における脚部５や周壁部
７の肉厚も薄くなる傾向にあるので、周壁部７の倒れに
よるシール性悪化が著しいものとなっている。This is not a serious problem when the wall thickness of the peripheral wall portion 7 is set to a large value, but in recent years, the cylinder head cover 3 has become smaller and thinner due to the reduction in size and weight of automobile engines and the like. Since the leg portions 5 and the peripheral wall portion 7 also tend to be thin, the deterioration of the sealing property due to the collapse of the peripheral wall portion 7 is remarkable.
課題を解決するための手段 この考案は上記の課題を解決するためになされたもので
あり、シリンダヘッド上面とシリンダヘッドカバー下面
との間で挾圧される基部を有するとともに、ボルト貫通
孔の周囲に、シリンダヘッドカバーの凹部内に嵌合する
略円筒状の周壁部が形成されてなるシリンダヘッドカバ
ー用ガスケットにおいて、上記周壁部は、ボルト締付状
態では上記凹部底面によって圧縮される高さを有し、か
つその上部内周面に、自由状態ではボルト径よりも内径
が僅かに大きく、かつ上記の圧縮状態ではボルト外周面
に接する膨出部が形成されていることを特徴としてい
る。Means for Solving the Problems This invention has been made in order to solve the above problems, and has a base portion that is pressed between the upper surface of the cylinder head and the lower surface of the cylinder head cover, and is provided around the bolt through hole. A cylinder head cover gasket in which a substantially cylindrical peripheral wall portion that fits in the recess of the cylinder head cover is formed, the peripheral wall portion having a height that is compressed by the bottom surface of the recess in a bolt tightened state, In addition, the inner peripheral surface of the upper part thereof is characterized in that a bulged portion having a slightly larger inner diameter than the bolt diameter in the free state and contacting the outer peripheral surface of the bolt in the compressed state is formed.
作用 上記膨出部は、自由状態ではボルト径よりも内径が大き
いので、何ら支障なくボルトを挿通することができる。
そして、ボルトを締め付けて周壁部が圧縮されると、上
記膨出部が更に内周側に膨らんでボルト外周面に圧接す
るので、周壁部の内周側への倒れ変形が抑制される。Action Since the bulging portion has an inner diameter larger than the bolt diameter in the free state, the bolt can be inserted without any trouble.
Then, when the peripheral wall portion is compressed by tightening the bolt, the bulging portion further expands toward the inner peripheral side and comes into pressure contact with the outer peripheral surface of the bolt, so that the collapse deformation of the peripheral wall portion toward the inner peripheral side is suppressed.
実施例 以下、この考案の一実施例を図面に基づいて詳細に説明
する。尚、前述した従来のものと同一部分には同一符号
を付し、重複する説明は省略する。Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that the same parts as those of the conventional one described above are denoted by the same reference numerals, and the duplicate description will be omitted.
第２図に示すように、シリンダヘッドカバー用ガスケッ
ト１は、シリンダヘッドカバー３周縁の形状に沿った形
の枠状に、可撓性を有するゴムもしくは合成樹脂によっ
て成形されており、かつ第７図に示すように、一般部に
おいては、断面矩形の帯状をなす基部４と、その上面に
突設された脚部５とを有している。尚、上記基部４の下
面には３本の突条２１が、脚部５の上面には１本の突条
２２がそれぞれ形成されている。As shown in FIG. 2, the cylinder head cover gasket 1 is formed of flexible rubber or synthetic resin in a frame shape along the peripheral edge of the cylinder head cover 3, and is shown in FIG. As shown, the general portion has a base portion 4 in the shape of a strip having a rectangular cross section, and a leg portion 5 protruding from the upper surface thereof. In addition, three ridges 21 are formed on the lower surface of the base portion 4, and one ridge 22 is formed on the upper surface of the leg portion 5.
第１図はシリンダヘッドカバー３固定用のボルト６が貫
通する部分のガスケット１等の分解断面図であって、前
述したように、ガスケット１にボルト貫通孔８を囲むよ
うに略円筒状の周壁部７が形成されているとともに、シ
リンダヘッドカバー３のボス部１０下面には、周壁部収
容凹部１１が形成されていて、両者が比較的密に嵌合す
るようになっている。ここで上記周壁部７の高さＨ
１は、周壁部収容凹部１１の深さＨ２よりも若干大きく
設定されている。尚、上記ボルト貫通孔８と同心状に基
部４下面に環状突起１２が形成されているとともに、こ
の実施例では、周壁部７上面にも、上記環状突起１２と
略等しい径で環状突起２３が形成されている（第５図，
第６図参照）。FIG. 1 is an exploded cross-sectional view of the gasket 1 and the like in a portion where the bolt 6 for fixing the cylinder head cover 3 penetrates. As described above, the gasket 1 has a substantially cylindrical peripheral wall portion surrounding the bolt through hole 8. 7 is formed, and a peripheral wall accommodating concave portion 11 is formed on the lower surface of the boss portion 10 of the cylinder head cover 3 so that they are relatively closely fitted to each other. Here, the height H of the peripheral wall portion 7
1 is set to be slightly larger than the depth H 2 of the peripheral wall accommodating recess 11. An annular protrusion 12 is formed on the lower surface of the base portion 4 concentrically with the bolt through hole 8 and, in this embodiment, an annular protrusion 23 having a diameter substantially equal to that of the annular protrusion 12 is also formed on the upper surface of the peripheral wall portion 7. Formed (Fig. 5,
(See FIG. 6).
そして上記周壁部７の上部内周面には、断面円弧形に内
周側に膨らんだ膨出部２４が全周に亙って形成されてい
る。この膨出部２４の内径Ｄ１はボルト６の軸部６ａの
径Ｄ２よりも僅かに大きく設定されている。尚、この膨
出部２４がボルト６の螺条によって傷付かないように、
ボルト６装着状態ではその軸部６ａが上記膨出部２４部
分に位置するようになっている。On the inner peripheral surface of the upper portion of the peripheral wall portion 7, a bulging portion 24 bulging toward the inner peripheral side in an arc shape in cross section is formed over the entire circumference. The inner diameter D 1 of the bulging portion 24 is set to be slightly larger than the diameter D 2 of the shaft portion 6a of the bolt 6. In addition, in order not to damage the bulging portion 24 by the thread of the bolt 6,
When the bolt 6 is attached, the shaft portion 6a is located at the bulging portion 24.
さて上記の構成においては、自由状態では膨出部２４の
内径Ｄ１がボルト６の径Ｄ２よりも大きいので、第３図
に示すように、何ら支障なくボルト６を挿通することが
できる。従って、ボルト６を無理に押し込んでガスケッ
トを傷付けてしまう虞れはない。In the above structure, since the inner diameter D 1 of the bulging portion 24 is larger than the diameter D 2 of the bolt 6 in the free state, the bolt 6 can be inserted without any trouble as shown in FIG. Therefore, there is no possibility that the gasket will be damaged by pushing the bolt 6 forcibly.
そして、ボルト６を締め付けた状態では、周壁部７が周
壁部収容凹部１１底面により圧縮されるため、上記膨出
部２４が内周側に更に膨らんでボルト６の軸部６ａ外周
面に圧接する。従って、第４図に示すように、周壁部７
の内周側への倒れ変形が抑制され、該周壁部７と周壁部
収容凹部１１との間で隙間が発生することがない。その
ため、この部分を通した潤滑油のにじみやブローバイガ
スの漏れを確実に防止できる。When the bolt 6 is tightened, the peripheral wall portion 7 is compressed by the bottom surface of the peripheral wall portion accommodating recess 11, so that the bulging portion 24 further bulges toward the inner peripheral side and comes into pressure contact with the outer peripheral surface of the shaft portion 6a of the bolt 6. . Therefore, as shown in FIG.
The falling deformation of the inner peripheral side of the peripheral wall is suppressed, and no gap is generated between the peripheral wall portion 7 and the peripheral wall portion recessed portion 11. Therefore, it is possible to reliably prevent the bleeding of the lubricating oil and the leakage of the blow-by gas through this portion.
尚、このとき上下面の環状突起１２，２３はそれぞれ強
く圧縮されてボルト貫通孔８，９の周囲をシールする
が、上記実施例では、周壁部７上面にも下面側の環状突
起１２と略等しい径の環状突起２３を設けてあるので、
両者の圧縮反力が互いに逆方向に作用して非常に安定し
たシール性能を得ることができる。At this time, the annular projections 12 and 23 on the upper and lower surfaces are strongly compressed to seal the periphery of the bolt through holes 8 and 9, but in the above embodiment, the annular projection 12 on the lower surface side is also formed on the upper surface of the peripheral wall portion 7. Since the annular protrusions 23 having the same diameter are provided,
The compression reaction forces of the two act in opposite directions, and a very stable sealing performance can be obtained.
また第８図は、上記周壁部７における膨出部２４の異な
る実施例を示すもので、この実施例では、膨出部２４が
略円筒状に形成されている。そして、この膨出部２４の
上端部２５および下端部２６は、ボルト６の螺条との引
っ掛かりを防止するためにテーパ面に形成してある。Further, FIG. 8 shows a different embodiment of the bulging portion 24 in the peripheral wall portion 7. In this embodiment, the bulging portion 24 is formed in a substantially cylindrical shape. The upper end 25 and the lower end 26 of the bulging portion 24 are formed into tapered surfaces to prevent the bolt 6 from being caught in the thread.
考案の効果 以上の説明で明らかなように、この考案に係るシリンダ
ヘッドカバー用ガスケットにおいては、ボルト貫通孔周
囲に形成した周壁部の内周側への倒れ変形を防止でき、
シリンダヘッドカバー側の凹部内周面との間に隙間を生
じることがない。従って、ボルト頭部周囲からの潤滑油
のにじみやブローバイガスの漏れを確実に防止できる。
また、ボルトの抜き差しは従来のものと何ら変わらずに
容易に行うことができ、例えばシリンダヘッドカバーに
多少の歪みがあったような場合でもボルト挿入が困難に
なることがない。Effect of the Invention As is apparent from the above description, in the cylinder head cover gasket according to the present invention, it is possible to prevent the peripheral wall portion formed around the bolt through hole from falling and deforming toward the inner peripheral side.
No gap is formed between the inner peripheral surface of the recess on the cylinder head cover side. Therefore, it is possible to reliably prevent the bleeding of the lubricating oil and the leakage of the blow-by gas from around the bolt head.
Further, the bolts can be easily inserted / removed without any difference from the conventional ones, and it is not difficult to insert the bolts even if the cylinder head cover is slightly distorted.
第１図はこの考案に係るガスケットをシリンダヘッドや
シリンダヘッドカバーとともに示す分解断面図、第２図
はその全体の斜視図、第３図はガスケットを組み付けた
状態（締付前）における断面図、第４図はボルト締付状
態における断面図、第５図はガスケット要部の上面図、
第６図は同じく底面図、第７図は第２図のVII-VII線に
沿った断面図、第８図は膨出部の異なる実施例を示すガ
スケット要部の断面図、第９図は従来におけるガスケッ
ト要部の斜視図、第１０図はそのボルト締付前の状態に
おける断面図、第１１図はボルト締付状態における断面
図である。 １…ガスケット、４…基部、６…ボルト、７…周壁部、
８…ボルト貫通孔、１１…周壁部収容凹部、２４…膨出
部。FIG. 1 is an exploded sectional view showing a gasket according to the present invention together with a cylinder head and a cylinder head cover, FIG. 2 is a perspective view of the whole, and FIG. 3 is a sectional view in a state in which the gasket is assembled (before tightening). Fig. 4 is a cross-sectional view of the bolt tightened, Fig. 5 is a top view of the gasket main part,
FIG. 6 is a bottom view of the same, FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 2, FIG. 8 is a cross-sectional view of the essential parts of the gasket showing another embodiment of the bulging portion, and FIG. FIG. 10 is a perspective view of a conventional gasket main part, FIG. 10 is a sectional view in a state before bolt tightening, and FIG. 11 is a sectional view in a bolt tightened state. 1 ... Gasket, 4 ... Base part, 6 ... Bolt, 7 ... Peripheral wall part,
8 ... Bolt through hole, 11 ... Peripheral wall accommodating recess, 24 ... Swelling part.
Claims (1)
ー下面との間で挾圧される基部を有するとともに、ボル
ト貫通孔の周囲に、シリンダヘッドカバーの凹部内に嵌
合する略円筒状の周壁部が形成されてなるシリンダヘッ
ドカバー用ガスケットにおいて、上記周壁部は、ボルト
締付状態では上記凹部底面によって圧縮される高さを有
し、かつその上部内周面に、自由状態ではボルト径より
も内径が僅かに大きく、かつ上記の圧縮状態ではボルト
外周面に接する膨出部が形成されていることを特徴とす
るシリンダヘッドカバー用ガスケット。1. A cylinder wall having a base portion that is pressed between an upper surface of the cylinder head and a lower surface of the cylinder head cover, and a substantially cylindrical peripheral wall portion that fits into a recess of the cylinder head cover is formed around the bolt through hole. In the gasket for a cylinder head cover, the peripheral wall portion has a height that is compressed by the bottom surface of the recess in the bolt tightened state, and has an inner diameter slightly smaller than the bolt diameter in the free state on the upper inner peripheral surface thereof. A gasket for a cylinder head cover, which is large and has a bulging portion which is in contact with the outer peripheral surface of the bolt in the compressed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988030192U JPH06691Y2 (en) | 1988-03-07 | 1988-03-07 | Gasket for cylinder head cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988030192U JPH06691Y2 (en) | 1988-03-07 | 1988-03-07 | Gasket for cylinder head cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01134758U JPH01134758U (en) | 1989-09-14 |
| JPH06691Y2 true JPH06691Y2 (en) | 1994-01-05 |
Family
ID=31255040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988030192U Expired - Lifetime JPH06691Y2 (en) | 1988-03-07 | 1988-03-07 | Gasket for cylinder head cover |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06691Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6388375A (en) * | 1986-09-30 | 1988-04-19 | Yamaha Motor Co Ltd | Sealing device for plastic cover |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59118895U (en) * | 1983-01-31 | 1984-08-10 | 三菱自動車工業株式会社 | Cover attachment device |
-
1988
- 1988-03-07 JP JP1988030192U patent/JPH06691Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6388375A (en) * | 1986-09-30 | 1988-04-19 | Yamaha Motor Co Ltd | Sealing device for plastic cover |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01134758U (en) | 1989-09-14 |
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