JP2003314363A - Metal gasket - Google Patents
Metal gasketInfo
- Publication number
- JP2003314363A JP2003314363A JP2002115378A JP2002115378A JP2003314363A JP 2003314363 A JP2003314363 A JP 2003314363A JP 2002115378 A JP2002115378 A JP 2002115378A JP 2002115378 A JP2002115378 A JP 2002115378A JP 2003314363 A JP2003314363 A JP 2003314363A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- combustion chamber
- metal gasket
- chamber hole
- thermal expansion
- 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.)
- Pending
Links
Landscapes
- Gasket Seals (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、内燃機関を構成す
るシリンダブロックとシリンダヘッドとの接合面間に介
装して該接合面間をシールする金属ガスケットに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal gasket which is interposed between the joint surfaces of a cylinder block and a cylinder head constituting an internal combustion engine and seals the joint surfaces.
【0002】[0002]
【従来の技術】従来のこの種の金属ガスケットとして
は、燃焼室孔の周囲および外周縁にそれぞれビードを設
け、シリンダヘッドとシリンダブロックとの接合面間に
介装して締結ボルトで締め付けることにより、ビードに
弾性反発力を発生させて前記接合面間をシールするよう
にしたものが知られている。2. Description of the Related Art A conventional metal gasket of this type is provided with beads on the periphery and outer peripheral edge of a combustion chamber hole, and is provided between the joint surfaces of a cylinder head and a cylinder block and tightened with fastening bolts. It is known that an elastic repulsive force is generated in the bead to seal the joint surfaces.
【0003】また、近年、シリンダヘッドおよびシリン
ダブロックのアルミ化が進んでエンジンの剛性が低下し
たことから、燃焼室孔の周縁を折り返したり、或いは燃
焼室孔の周縁に金属板を積層して該周縁を他の部分より
厚くし、かかる板厚差によりシリンダヘッドとシリンダ
ブロックとの接合面間に介装して締結ボルトで締め付け
る際に燃焼室孔の周縁に面圧を集中させ、これにより、
シール条件の厳しい燃焼室孔の周囲に最大荷重をかけて
前記接合面間をシールするようにしたものが採用されて
いる。Further, in recent years, since the cylinder head and the cylinder block have been made of aluminum and the rigidity of the engine has decreased, the periphery of the combustion chamber hole is folded back or a metal plate is laminated on the periphery of the combustion chamber hole. The peripheral edge is made thicker than other portions, and due to the difference in plate thickness, the surface pressure is concentrated on the peripheral edge of the combustion chamber hole when it is interposed between the joint surfaces of the cylinder head and the cylinder block and tightened with the fastening bolts.
A structure is employed in which the maximum load is applied to the periphery of the combustion chamber hole under severe sealing conditions to seal the joint surfaces.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来の金属ガスケットにおいては、燃焼室孔の周縁部の厚
肉部や燃焼室孔の周囲のビードがバネ性に乏しく、エン
ジンの熱によるシリンダヘッドおよびシリンダブロック
の変形に追従できず、このため、シリンダヘッドとシリ
ンダブロックとの間に隙間が発生してシール性が低下す
ることがある。However, in the above-mentioned conventional metal gasket, the thick portion at the peripheral portion of the combustion chamber hole and the bead around the combustion chamber hole have a poor spring property, and the cylinder head and The deformation of the cylinder block cannot be followed, which may cause a gap between the cylinder head and the cylinder block to deteriorate the sealing performance.
【0005】また、外周縁のビードについてもバネ性に
乏しいため、エンジンの熱によるシリンダヘッドとシリ
ンダブロックの変形が大きい場合、冷間時・運転時のシ
リンダヘッドとシリンダブロックとの間の隙間の変動に
よりシール性の低下を招くことがあり、しかも、エンジ
ンによっては冷間時のエンジン始動時にシリンダヘッド
とシリンダヘッドとの間の隙間が大きい場合にはシール
圧が足らず、クランキングできないこともある。Also, since the bead on the outer peripheral edge is poor in springiness, when the deformation of the cylinder head and the cylinder block due to the heat of the engine is large, there is a gap between the cylinder head and the cylinder block during cold operation. Fluctuations may cause deterioration in sealing performance, and depending on the engine, if the clearance between the cylinder heads is large during cold engine start, the seal pressure may be insufficient and cranking may not be possible. .
【0006】本発明はこのような不都合を解消するため
になされたものであり、エンジンの熱によるシリンダヘ
ッドとシリンダブロックの変形が大きい場合でも良好な
シール性を確保することができる金属ガスケットを提供
することを目的とする。The present invention has been made to solve such inconvenience, and provides a metal gasket capable of ensuring a good sealing property even when the cylinder head and the cylinder block are largely deformed by heat of the engine. The purpose is to do.
【0007】[0007]
【課題を解決するための手段】上記目的を達成するため
に、請求項1に係る発明は、シリンダヘッドとシリンダ
ブロックとの接合面間に介装して締結ボルトで締め付け
ることにより、前記接合面間をシールするようにした金
属ガスケットであって、熱膨張率の異なる少なくとも2
枚の金属板を板厚方向に重合した重合部を備え、各金属
板の熱膨張率の違いを利用してエンジンの熱により前記
重合部を板厚方向に変形可能に構成したことを特徴とす
る。In order to achieve the above-mentioned object, the invention according to claim 1 interposes between the joint surfaces of the cylinder head and the cylinder block and tightens them with fastening bolts, whereby the joint surfaces are A metal gasket which seals the space between at least two different thermal expansion coefficients.
It is characterized by comprising a polymerized portion obtained by polymerizing the metal plates in the plate thickness direction, and by utilizing the difference in the coefficient of thermal expansion of each metal plate, the polymerized part can be deformed in the plate thickness direction by the heat of the engine. To do.
【0008】請求項2に係る発明は、請求項1におい
て、燃焼室孔の周縁部を他の部分より厚くして前記重合
部としたことを特徴とする。請求項3に係る発明は、請
求項1又は2において、燃焼室孔の周囲に設けられたビ
ードを前記重合部としたことを特徴とする。請求項4に
係る発明は、請求項1〜3のいずれか一項において、外
周縁に設けられたビードを前記重合部としたことを特徴
とする。According to a second aspect of the present invention, in the first aspect, the peripheral portion of the combustion chamber hole is made thicker than other portions to form the overlapping portion. The invention according to claim 3 is characterized in that, in claim 1 or 2, a bead provided around a combustion chamber hole is the overlapping portion. The invention according to a fourth aspect is characterized in that, in any one of the first to third aspects, a bead provided on an outer peripheral edge is the overlapping portion.
【0009】[0009]
【発明の実施の形態】以下、本発明の実施の形態を図を
参照して説明する。図1は本発明の第1の実施の形態で
ある金属ガスケットを説明するための平面図、図2は図
1のA−A線断面図、図3〜図8は本発明の他の実施の
形態である金属ガスケットを説明するための断面図であ
る。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view for explaining a metal gasket which is a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIGS. 3 to 8 are other embodiments of the present invention. It is sectional drawing for demonstrating the metal gasket which is a form.
【0010】まず、図1および図2を参照して、本発明
の第1の実施の形態である金属ガスケットから説明する
と、この金属ガスケット10は金属板からなる2枚の基
板11a,11bを積層接合した積層基板11を備えて
おり、該積層基板11の略中央部には燃焼室孔12がシ
リンダボア端部に対応して形成されている。積層基板1
1の燃焼室孔12の外側部分には締結ボルトのボルト挿
通穴14が燃焼室孔12の周方向の略等間隔で形成さ
れ、各ボルト挿通穴14間には油穴15や水穴16が形
成されている。First, referring to FIGS. 1 and 2, a metal gasket according to a first embodiment of the present invention will be described. The metal gasket 10 is formed by laminating two substrates 11a and 11b made of metal plates. The laminated substrate 11 is joined, and a combustion chamber hole 12 is formed at a substantially central portion of the laminated substrate 11 so as to correspond to an end portion of a cylinder bore. Laminated board 1
On the outer side of the combustion chamber hole 12 of No. 1, bolt insertion holes 14 of fastening bolts are formed at substantially equal intervals in the circumferential direction of the combustion chamber hole 12, and oil holes 15 and water holes 16 are provided between the bolt insertion holes 14. Has been formed.
【0011】また、積層基板11の燃焼室孔12側の端
部は上方に折り曲げられて板厚方向に重合されており、
これにより、燃焼室孔12の周縁部に基板11a,11
bが上下2層ずつ合計4層の凸状の重合部17が形成さ
れて他の部分より厚くされている(図2(a)参照)。
ここで、この実施の形態では、図2において積層基板1
1の上側の基板11aと下側の基板11bとを熱膨張率
の異なる金属板で形成し、且つ、上側の基板11aの熱
膨張率を下側の基板11bの熱膨張率より大きくしてい
る。Further, the end portion of the laminated substrate 11 on the combustion chamber hole 12 side is bent upward and overlapped in the plate thickness direction,
As a result, the substrates 11a, 11
b is formed to have a total of four convex overlapping portions 17 each including two upper and lower layers, and is thicker than other portions (see FIG. 2A).
Here, in this embodiment, the laminated substrate 1 in FIG.
The upper substrate 11a and the lower substrate 11b of 1 are formed of metal plates having different thermal expansion coefficients, and the thermal expansion coefficient of the upper substrate 11a is made larger than that of the lower substrate 11b. .
【0012】そして、かかる構成の金属ガスケット10
をシリンダブロックとシリンダヘッドとの接合面間に介
装して締結ボルトで締め付けると、締め付け終了時にお
いては、最も板厚が厚い燃焼室孔12の周縁部の重合部
17と外側部分との板厚差により燃焼室孔12の周縁部
に最も面圧が集中し、これにより、シール条件が厳しい
シリンダボアの端部周囲に最大荷重が作用して前記接合
面間のシールがなされる。Then, the metal gasket 10 having such a configuration.
Is interposed between the joining surfaces of the cylinder block and the cylinder head and tightened with fastening bolts, at the end of tightening, the plate of the overlapping portion 17 and the outer portion of the peripheral portion of the combustion chamber hole 12 having the thickest plate is formed. Due to the thickness difference, the surface pressure is most concentrated on the peripheral edge portion of the combustion chamber hole 12, whereby a maximum load is applied to the periphery of the end of the cylinder bore where the sealing condition is severe so that the joint surfaces are sealed.
【0013】このとき、上述したように、積層基板11
の上側の基板11aの熱膨張率を下側の基板11bの熱
膨張率より大きくしているため、重合部17で上側の基
板11aがエンジンの熱により膨張(伸長)して基板1
1bと共に重合部17の折り返し部分を開く方向(板厚
方向)に変形する(図2(b)参照)。これにより、燃
焼室孔12の周縁部の重合部17がバネ性に乏しくて
も、エンジンの熱によるシリンダヘッドおよびシリンダ
ブロックの変形に重合部17が良好に追従し、この結
果、シリンダヘッドとシリンダブロックとの間に隙間が
発生しても良好なシール性を確保することができる。At this time, as described above, the laminated substrate 11
Since the coefficient of thermal expansion of the upper substrate 11a is higher than the coefficient of thermal expansion of the lower substrate 11b, the upper substrate 11a is expanded (expanded) by the heat of the engine in the overlapping portion 17 and the substrate 1
Along with 1b, the folded portion of the overlapping portion 17 is deformed in the opening direction (plate thickness direction) (see FIG. 2B). As a result, even if the overlapping portion 17 at the peripheral portion of the combustion chamber hole 12 has poor spring property, the overlapping portion 17 follows the deformation of the cylinder head and the cylinder block due to the heat of the engine well, and as a result, the cylinder head and the cylinder block. Even if a gap is generated between the block and the block, good sealing property can be secured.
【0014】次に、図3を参照して、本発明の第2の実
施の形態である金属ガスケットを説明すると、この金属
ガスケット20は金属板からなる1枚の基板21を備え
ており、該基板21の略中央部には燃焼室孔22がシリ
ンダボア端部に対応して形成されている。基板21の燃
焼室孔22の外側部分には、第1の実施の形態と同様
に、締結ボルトのボルト挿通穴が燃焼室孔22の周方向
の略等間隔で形成され、各ボルト挿通穴間には油穴や水
穴が形成されている(共に図示せず)。Next, referring to FIG. 3, a metal gasket according to a second embodiment of the present invention will be described. This metal gasket 20 is provided with one substrate 21 made of a metal plate, A combustion chamber hole 22 is formed in a substantially central portion of the substrate 21 so as to correspond to an end portion of the cylinder bore. Similar to the first embodiment, the bolt insertion holes of the fastening bolts are formed in the outer portion of the combustion chamber hole 22 of the substrate 21 at substantially equal intervals in the circumferential direction of the combustion chamber hole 22, and between the bolt insertion holes. An oil hole and a water hole are formed in each (both not shown).
【0015】また、基板21の燃焼室孔22側の端部上
面には2枚の環状板23,24が板厚方向に重合されて
おり、これにより、燃焼室孔22の周縁部に基板21,
環状板23,24の合計3層の凸状の重合部27が形成
されて他の部分より厚くされている(図3(a)参
照)。ここで、この実施の形態では、2枚の環状板2
3,24を熱膨張率の異なる金属板で形成し、且つ、図
3において下側の環状板24の熱膨張率を上側の環状板
23および基板21の熱膨張率より大きくしている。ま
た、2枚の環状板23,24は互いに面接合されて下側
の環状板24の外周部が基板21に溶接等により接合さ
れている。Further, two annular plates 23 and 24 are superposed in the plate thickness direction on the upper surface of the end portion of the substrate 21 on the side of the combustion chamber hole 22. As a result, the substrate 21 is formed on the peripheral portion of the combustion chamber hole 22. ,
A total of three layers of convex overlapping portions 27 of the annular plates 23 and 24 are formed and made thicker than other portions (see FIG. 3A). Here, in this embodiment, the two annular plates 2
3, 24 are formed of metal plates having different thermal expansion coefficients, and the lower annular plate 24 in FIG. 3 has a higher thermal expansion coefficient than the upper annular plate 23 and the substrate 21. Further, the two annular plates 23 and 24 are surface-bonded to each other, and the outer peripheral portion of the lower annular plate 24 is bonded to the substrate 21 by welding or the like.
【0016】そして、かかる構成の金属ガスケット20
をシリンダブロックとシリンダヘッドとの接合面間に介
装して締結ボルトで締め付けると、締め付け終了時にお
いては、最も板厚が厚い燃焼室孔22の周縁部の重合部
27と外側部分との板厚差により燃焼室孔22の周縁部
に最も面圧が集中し、これにより、シール条件が厳しい
シリンダボアの端部周囲に最大荷重が作用して前記接合
面間のシールがなされる。Then, the metal gasket 20 having such a configuration.
Is interposed between the joining surfaces of the cylinder block and the cylinder head and tightened with fastening bolts, at the end of the tightening, the plate of the overlapping portion 27 and the outer portion of the peripheral portion of the combustion chamber hole 22 having the thickest plate is formed. Due to the thickness difference, the surface pressure is most concentrated on the peripheral edge portion of the combustion chamber hole 22, whereby a maximum load is applied to the periphery of the end of the cylinder bore where the sealing condition is severe, so that the joint surfaces are sealed.
【0017】このとき、上述したように、下側の環状板
24の熱膨張率を上側の環状板23および基板21の熱
膨張率より大きくし、且つ、2枚の環状板23,24を
互いに面接合して下側の環状板24の外周部を基板21
に接合しているため、重合部27で下側の環状板24が
エンジンの熱により膨張(伸長)して上側の環状板23
と共に外周部の接合箇所を起点として上方に湾曲する方
向(板厚方向)に変形する(図3(b)参照)。At this time, as described above, the coefficient of thermal expansion of the lower annular plate 24 is made larger than the coefficients of thermal expansion of the upper annular plate 23 and the substrate 21, and the two annular plates 23, 24 are mutually connected. The outer peripheral portion of the lower annular plate 24 is surface-bonded to the substrate 21.
Since the upper annular plate 23 is joined to the upper annular plate 23, the lower annular plate 24 expands (expands) by the heat of the engine at the overlapping portion 27.
At the same time, it is deformed in the upward curving direction (plate thickness direction) starting from the joining point on the outer peripheral portion (see FIG. 3B).
【0018】これにより、燃焼室孔22の周縁部の重合
部27がバネ性に乏しくても、エンジンの熱によるシリ
ンダヘッドおよびシリンダブロックの変形に重合部27
が良好に追従し、この結果、シリンダヘッドとシリンダ
ブロックとの間に隙間が発生しても良好なシール性を確
保することができる。次に、図4を参照して、本発明の
第3の実施の形態である金属ガスケットを説明すると、
この金属ガスケット30は金属板からなる1枚の基板3
1を備えており、該基板31の略中央部には燃焼室孔3
2がシリンダボア端部に対応して形成されている。基板
31の燃焼室孔32の外側部分には、第1の実施の形態
と同様に、締結ボルトのボルト挿通穴が燃焼室孔32の
周方向の略等間隔で形成され、各ボルト挿通穴間には油
穴や水穴が形成されている(共に図示せず)。As a result, even if the overlapping portion 27 at the peripheral portion of the combustion chamber hole 22 has a poor spring property, the overlapping portion 27 is deformed due to the deformation of the cylinder head and the cylinder block due to the heat of the engine.
Satisfactorily follows, and as a result, good sealing performance can be secured even if a gap occurs between the cylinder head and the cylinder block. Next, referring to FIG. 4, a metal gasket according to a third embodiment of the present invention will be described.
This metal gasket 30 is a single substrate 3 made of a metal plate.
1, and the combustion chamber hole 3 is provided in the substantially central portion of the substrate 31.
2 is formed corresponding to the end of the cylinder bore. Similar to the first embodiment, the bolt insertion holes of the fastening bolts are formed in the outer portion of the combustion chamber hole 32 of the substrate 31 at substantially equal intervals in the circumferential direction of the combustion chamber hole 32. An oil hole and a water hole are formed in each (both not shown).
【0019】また、基板31の燃焼室孔32側の端部上
面には金属板からなる1枚の環状板33が板厚方向に重
合されており、これにより、燃焼室孔32の周縁部に基
板31および環状板33の合計2層の凸状の重合部37
が形成されて他の部分より厚くされている(図4(a)
参照)。ここで、この実施の形態では、基板31の熱膨
張率を環状板33の熱膨張率より大きくして基板31と
環状板33を互いに面接合している。A single annular plate 33 made of a metal plate is superposed in the plate thickness direction on the upper surface of the end of the substrate 31 on the side of the combustion chamber hole 32, whereby the periphery of the combustion chamber hole 32 is formed. A total of two layers of convex-shaped overlapping portions 37 of the substrate 31 and the annular plate 33.
Are formed to be thicker than other portions (FIG. 4A).
reference). Here, in this embodiment, the coefficient of thermal expansion of the substrate 31 is made larger than that of the annular plate 33, and the substrate 31 and the annular plate 33 are surface-bonded to each other.
【0020】そして、かかる構成の金属ガスケット30
をシリンダブロックとシリンダヘッドとの接合面間に介
装して締結ボルトで締め付けると、締め付け終了時にお
いては、最も板厚が厚い燃焼室孔32の周縁部の重合部
37と外側部分との板厚差により燃焼室孔32の周縁部
に最も面圧が集中し、これにより、シール条件が厳しい
シリンダボアの端部周囲に最大荷重が作用して前記接合
面間のシールがなされる。The metal gasket 30 having the above structure
Is interposed between the joining surfaces of the cylinder block and the cylinder head and tightened with fastening bolts, at the end of tightening, the plate of the overlapping portion 37 and the outer portion of the peripheral portion of the combustion chamber hole 32 having the thickest plate is formed. Due to the thickness difference, the surface pressure is most concentrated on the peripheral edge portion of the combustion chamber hole 32, whereby a maximum load is applied to the periphery of the end portion of the cylinder bore where the sealing condition is severe, so that the joint surfaces are sealed.
【0021】このとき、上述したように、基板31の熱
膨張率を環状板33の熱膨張率より大きくして基板31
と環状板33を互いに面接合しているため、重合部37
で基板31がエンジンの熱により膨張(伸長)して環状
板33と共に上方に湾曲する方向(板厚方向)に変形す
る(図4(b)参照)。これにより、燃焼室孔32の周
縁部の重合部37がバネ性に乏しくても、エンジンの熱
によるシリンダヘッドおよびシリンダブロックの変形に
重合部37が良好に追従し、この結果、シリンダヘッド
とシリンダブロックとの間に隙間が発生しても良好なシ
ール性を確保することができる。At this time, as described above, the coefficient of thermal expansion of the substrate 31 is made larger than that of the annular plate 33, and the substrate 31 is
Since the annular plate 33 and the annular plate 33 are surface-bonded to each other, the overlapping portion 37
Then, the substrate 31 expands (extends) by the heat of the engine and deforms together with the annular plate 33 in the direction of bending upward (plate thickness direction) (see FIG. 4B). As a result, even if the overlapping portion 37 at the peripheral portion of the combustion chamber hole 32 is poor in springiness, the overlapping portion 37 follows the deformation of the cylinder head and the cylinder block due to the heat of the engine, and as a result, the cylinder head and the cylinder Even if a gap is generated between the block and the block, good sealing property can be secured.
【0022】次に、図5を参照して、本発明の第4の実
施の形態である金属ガスケットを説明すると、この金属
ガスケット40は金属板からなる2枚の基板41a,4
1bを積層接合した積層基板41を備えており、該積層
基板41の略中央部には燃焼室孔42がシリンダボア端
部に対応して形成されている。積層基板41の燃焼室孔
42の外側部分には、第1の実施の形態と同様に、締結
ボルトのボルト挿通穴が燃焼室孔42の周方向の略等間
隔で形成され、各ボルト挿通穴間には油穴や水穴が形成
されている(共に図示せず)。Next, referring to FIG. 5, a metal gasket according to a fourth embodiment of the present invention will be described. This metal gasket 40 is composed of two substrates 41a, 4a made of metal plates.
A laminated substrate 41, which is formed by laminating and joining 1b, is provided, and a combustion chamber hole 42 is formed in a substantially central portion of the laminated substrate 41 so as to correspond to an end portion of a cylinder bore. As in the first embodiment, the bolt insertion holes of the fastening bolts are formed in the outer portion of the combustion chamber hole 42 of the laminated substrate 41 at substantially equal intervals in the circumferential direction of the combustion chamber hole 42. Oil holes and water holes are formed between them (both not shown).
【0023】また、積層基板41の燃焼室孔42側の周
囲にはフルビード43が積層基板41を上方に湾曲成形
して形成されて凸状の重合部とされている(図5(a)
参照)。ここで、この実施の形態では、図5において積
層基板41の上側の基板41aと下側の基板41bとを
熱膨張率の異なる金属板で形成し、且つ、上側の基板4
1aの熱膨張率を下側の基板41bの熱膨張率より大き
くしている。A full bead 43 is formed by curving the laminated substrate 41 upward around the periphery of the laminated substrate 41 on the side of the combustion chamber 42 to form a convex overlapping portion (FIG. 5A).
reference). Here, in this embodiment, in FIG. 5, the upper substrate 41a and the lower substrate 41b of the laminated substrate 41 are formed of metal plates having different thermal expansion coefficients, and the upper substrate 4 is
The coefficient of thermal expansion of 1a is made larger than that of the lower substrate 41b.
【0024】そして、かかる構成の金属ガスケット40
をシリンダブロックとシリンダヘッドとの接合面間に介
装して締結ボルトで締め付けると、締め付け終了時にお
いては、フルビード43が板厚方向に圧縮されて弾性反
発力を発生し、これにより、前記接合面間のシールがな
される。このとき、上述したように、積層基板41の上
側の基板41aの熱膨張率を下側の基板41bの熱膨張
率より大きくしているため、フルビード43の部分で上
側の基板41aがエンジンの熱により膨張(伸長)して
下側の基板41bと共にフルビード43を上方に膨出す
る方向(板厚方向)に変形する(図5(b)参照)。The metal gasket 40 having such a structure
When it is interposed between the joint surfaces of the cylinder block and the cylinder head and tightened with fastening bolts, at the end of tightening, the full bead 43 is compressed in the plate thickness direction to generate an elastic repulsive force. A face-to-face seal is made. At this time, as described above, since the coefficient of thermal expansion of the upper board 41a of the laminated board 41 is set to be larger than that of the lower board 41b, the upper board 41a in the full bead 43 portion does not heat the engine. Thus, the full bead 43 is expanded (expanded) and deformed together with the lower substrate 41b in a direction in which the full bead 43 swells upward (a plate thickness direction) (see FIG. 5B).
【0025】これにより、燃焼室孔42の周囲のフルビ
ード43がバネ性に乏しくても、エンジンの熱によるシ
リンダヘッドおよびシリンダブロックの変形にフルビー
ド43が良好に追従し、この結果、シリンダヘッドとシ
リンダブロックとの間に隙間が発生しても良好なシール
性を確保することができる。次に、図6を参照して、本
発明の第5の実施の形態である金属ガスケットを説明す
ると、この金属ガスケット50は金属板からなる2枚の
基板51a,51bを積層接合した積層基板51を備え
ており、該積層基板51の略中央部には燃焼室孔(図示
せず)がシリンダボア端部に対応して形成されている。
積層基板51の燃焼室孔の外側部分には、第1の実施の
形態と同様に、締結ボルトのボルト挿通穴が燃焼室孔の
周方向の略等間隔で形成され、各ボルト挿通穴間には油
穴や水穴が形成されている(共に図示せず)。As a result, even if the full bead 43 around the combustion chamber hole 42 has a poor spring property, the full bead 43 favorably follows the deformation of the cylinder head and the cylinder block due to the heat of the engine, and as a result, the cylinder head and the cylinder. Even if a gap is generated between the block and the block, good sealing property can be secured. Next, referring to FIG. 6, a metal gasket according to a fifth embodiment of the present invention will be described. The metal gasket 50 is a laminated substrate 51 in which two substrates 51a and 51b made of metal plates are laminated and joined. A combustion chamber hole (not shown) is formed in the substantially central portion of the laminated substrate 51 so as to correspond to the cylinder bore end portion.
Similar to the first embodiment, the bolt insertion holes of the fastening bolts are formed in the outer portion of the combustion chamber hole of the laminated substrate 51 at substantially equal intervals in the circumferential direction of the combustion chamber hole, and the bolt insertion holes are provided between the bolt insertion holes. Has oil holes and water holes (both not shown).
【0026】また、積層基板51の外周縁にはステップ
状のハーフビード53が積層基板51を上方に屈曲成形
して形成されて凸状の重合部とされている(図6(a)
参照)。ここで、この実施の形態では、図6において積
層基板51の上側の基板51aと下側の基板51bとを
熱膨張率の異なる金属板で形成し、且つ、上側の基板5
1aの熱膨張率を下側の基板51bの熱膨張率より大き
くしている。A stepped half bead 53 is formed on the outer peripheral edge of the laminated substrate 51 by bending the laminated substrate 51 upward to form a convex overlapping portion (FIG. 6A).
reference). Here, in this embodiment, in FIG. 6, the upper substrate 51a and the lower substrate 51b of the laminated substrate 51 are formed of metal plates having different thermal expansion coefficients, and the upper substrate 5 is
The coefficient of thermal expansion of 1a is made larger than that of the lower substrate 51b.
【0027】そして、かかる構成の金属ガスケット50
をシリンダブロックとシリンダヘッドとの接合面間に介
装して締結ボルトで締め付けると、締め付け終了時にお
いては、ハーフビード53が板厚方向に圧縮されて弾性
反発力を発生し、これにより、前記接合面間のシールが
なされる。このとき、上述したように、積層基板51の
上側の基板51aの熱膨張率を下側の基板51bの熱膨
張率より大きくしているため、ハーフビード53の部分
で上側の基板51aがエンジンの熱により膨張(伸長)
して下側の基板51bと共にハーフビード53を下方に
屈曲させる方向(板厚方向)に変形する(図6(b)参
照)。Then, the metal gasket 50 having such a configuration.
When it is interposed between the joining surfaces of the cylinder block and the cylinder head and tightened with fastening bolts, at the end of tightening, the half beads 53 are compressed in the plate thickness direction to generate elastic repulsive force, whereby the joining A face-to-face seal is made. At this time, as described above, since the coefficient of thermal expansion of the upper substrate 51a of the laminated board 51 is set to be larger than that of the lower substrate 51b, the upper substrate 51a in the portion of the half bead 53 is the thermal engine of the engine. Expansion (expansion)
Then, the half bead 53 is deformed in the direction of bending downward (plate thickness direction) together with the lower substrate 51b (see FIG. 6B).
【0028】これにより、積層基板51の外周縁のハー
フビード53がバネ性に乏しくても、エンジンの熱によ
るシリンダヘッドおよびシリンダブロックの変形にハー
フビード53が良好に追従し、この結果、シリンダヘッ
ドとシリンダブロックとの間に隙間が発生しても良好な
シール性を確保することができる。次に、図7を参照し
て、本発明の第6の実施の形態である金属ガスケットを
説明すると、この金属ガスケット60は金属板からなる
1枚の基板61を備えており、該基板61の略中央部に
は燃焼室孔62がシリンダボア端部に対応して形成され
ている。基板61の燃焼室孔62の外側部分には、第1
の実施の形態と同様に、締結ボルトのボルト挿通穴が燃
焼室孔62の周方向の略等間隔で形成され、各ボルト挿
通穴間には油穴や水穴が形成されている(共に図示せ
ず。)。As a result, even if the half bead 53 on the outer peripheral edge of the laminated substrate 51 has a poor spring property, the half bead 53 follows well the deformation of the cylinder head and the cylinder block due to the heat of the engine. Even if a gap is generated between the block and the block, good sealing property can be secured. Next, with reference to FIG. 7, a metal gasket according to a sixth embodiment of the present invention will be described. The metal gasket 60 includes one substrate 61 made of a metal plate. A combustion chamber hole 62 is formed at a substantially central portion so as to correspond to the cylinder bore end portion. The first portion is provided on the outer side of the combustion chamber hole 62 of the substrate 61.
Similar to the embodiment described above, the bolt insertion holes of the fastening bolts are formed at substantially equal intervals in the circumferential direction of the combustion chamber hole 62, and oil holes and water holes are formed between the bolt insertion holes (both are shown in FIG. Not shown.).
【0029】また、基板61の燃焼室孔62側の端部は
上方に折り曲げられて該折り曲げ部分に2枚の環状板6
3,64を内包した状態で板厚方向に重合されており、
これにより、燃焼室孔62の周縁部に上下2層の基板6
1と2枚の環状板63,64とで合計4層の凸状の重合
部67が形成されて他の部分より厚くされている(図7
(a)参照)。The end portion of the substrate 61 on the combustion chamber hole 62 side is bent upward, and the two annular plates 6 are formed at the bent portion.
Polymerized in the plate thickness direction with 3, 64 included,
As a result, the upper and lower two layers of the substrate 6 are formed on the peripheral edge of the combustion chamber hole 62.
A total of four layers of convex overlapping portions 67 are formed by the one and two annular plates 63, 64 and are thicker than other portions (FIG. 7).
(See (a)).
【0030】ここで、この実施の形態では、2枚の環状
板63,64を熱膨張率の異なる金属板で形成し、且
つ、図7において上側の環状板63の熱膨張率を下側の
環状板64および基板61の熱膨張率より大きくしてい
る。また、2枚の環状板63,64は互いに面接合され
ている。そして、かかる構成の金属ガスケット60をシ
リンダブロックとシリンダヘッドとの接合面間に介装し
て締結ボルトで締め付けると、締め付け終了時において
は、最も板厚が厚い燃焼室孔62の周縁部の重合部67
と外側部分との板厚差により燃焼室孔62の周縁部に最
も面圧が集中し、これにより、シール条件が厳しいシリ
ンダボアの端部周囲に最大荷重が作用して前記接合面間
のシールがなされる。Here, in this embodiment, the two annular plates 63 and 64 are formed of metal plates having different coefficients of thermal expansion, and the coefficient of thermal expansion of the upper annular plate 63 in FIG. The coefficient of thermal expansion is set larger than that of the annular plate 64 and the substrate 61. Further, the two annular plates 63 and 64 are surface-bonded to each other. Then, when the metal gasket 60 having such a configuration is interposed between the joining surfaces of the cylinder block and the cylinder head and tightened with the fastening bolts, when the fastening is completed, the peripheral portion of the combustion chamber hole 62 having the thickest plate is overlapped. Part 67
The surface pressure is most concentrated on the peripheral edge portion of the combustion chamber hole 62 due to the difference in plate thickness between the outer surface and the outer portion, and as a result, the maximum load acts around the end of the cylinder bore where the sealing condition is severe, and the sealing between the joint surfaces is performed. Done.
【0031】このとき、上述したように、上側の環状板
63の熱膨張率を下側の環状板64および基板61の熱
膨張率より大きくして2枚の環状板63,64を互いに
面接合しているため、重合部67で上側の環状板63が
エンジンの熱により膨張(伸長)して下側の環状板64
と共に上方に湾曲し、これにより、基板61の折り返し
部分を開く方向(板厚方向)に変形する(図7(b)参
照)。At this time, as described above, the thermal expansion coefficient of the upper annular plate 63 is made larger than the thermal expansion coefficients of the lower annular plate 64 and the substrate 61, and the two annular plates 63, 64 are surface-bonded to each other. Therefore, in the overlapping portion 67, the upper annular plate 63 expands (extends) by the heat of the engine, and the lower annular plate 64 expands.
Together with this, it bends upward, and thereby is deformed in the direction (plate thickness direction) in which the folded-back portion of the substrate 61 is opened (see FIG. 7B).
【0032】これにより、燃焼室孔62の周縁部の重合
部67がバネ性に乏しくても、エンジンの熱によるシリ
ンダヘッドおよびシリンダブロックの変形に重合部67
が良好に追従し、この結果、シリンダヘッドとシリンダ
ブロックとの間に隙間が発生しても良好なシール性を確
保することができる。次に、図8を参照して、本発明の
第7の実施の形態である金属ガスケットを説明すると、
この金属ガスケット70は金属板からなる1枚の基板7
1を備えており、該基板71の略中央部には燃焼室孔7
2がシリンダボア端部に対応して形成されている。基板
71の燃焼室孔72の外側部分には、第1の実施の形態
と同様に、締結ボルトのボルト挿通穴が燃焼室孔72の
周方向の略等間隔で形成され、各ボルト挿通穴間には油
穴や水穴が形成されている(共に図示せず。)。As a result, even if the overlapping portion 67 at the peripheral portion of the combustion chamber hole 62 has a poor spring property, the overlapping portion 67 is deformed due to the deformation of the cylinder head and the cylinder block due to the heat of the engine.
Satisfactorily follows, and as a result, good sealing performance can be secured even if a gap occurs between the cylinder head and the cylinder block. Next, referring to FIG. 8, a metal gasket according to a seventh embodiment of the present invention will be described.
This metal gasket 70 is a single substrate 7 made of a metal plate.
1 and the combustion chamber hole 7 is provided at the substantially central portion of the substrate 71.
2 is formed corresponding to the end of the cylinder bore. Similar to the first embodiment, the bolt insertion holes of the fastening bolts are formed in the outer portion of the combustion chamber hole 72 of the substrate 71 at substantially equal intervals in the circumferential direction of the combustion chamber hole 72, and the space between the bolt insertion holes is increased. Oil holes and water holes are formed in both (both not shown).
【0033】また、基板71の燃焼室孔72側の端部は
上方に折り曲げられて該折り曲げ部分に1枚の環状板7
3を内包した状態で板厚方向に重合されており、これに
より、燃焼室孔72の周縁部に上下2層の基板71と1
枚の環状板73とで合計3層の凸状の重合部77が形成
されて他の部分より厚くされている(図8(a)参
照)。Further, the end of the substrate 71 on the combustion chamber hole 72 side is bent upward, and one annular plate 7 is formed at the bent portion.
3 are encapsulated in the plate thickness direction in a state of being enclosed, so that the upper and lower two layers of the substrates 71 and 1 are formed in the peripheral edge of the combustion chamber hole 72.
A total of three layers of convex overlapping portions 77 are formed with the annular plate 73 and are thicker than other portions (see FIG. 8A).
【0034】ここで、この実施の形態では、環状板73
の熱膨張率を基板71の熱膨張率より大きくしている。
また、環状板73の幅は基板71の折り返し幅より長く
されて外周部が該折り返し部分より外側に配置され、且
つ、該外周部が溶接等により基板71に接合されてい
る。そして、かかる構成の金属ガスケット70をシリン
ダブロックとシリンダヘッドとの接合面間に介装して締
結ボルトで締め付けると、締め付け終了時においては、
最も板厚が厚い燃焼室孔72の周縁部の重合部77と外
側部分との板厚差により燃焼室孔72の周縁部に最も面
圧が集中し、これにより、シール条件が厳しいシリンダ
ボアの端部周囲に最大荷重が作用して前記接合面間のシ
ールがなされる。Here, in this embodiment, the annular plate 73 is used.
The coefficient of thermal expansion is larger than that of the substrate 71.
The width of the annular plate 73 is longer than the folded width of the substrate 71, the outer peripheral portion is arranged outside the folded portion, and the outer peripheral portion is joined to the substrate 71 by welding or the like. Then, when the metal gasket 70 having such a configuration is interposed between the joining surfaces of the cylinder block and the cylinder head and tightened with fastening bolts, when the fastening is completed,
The surface pressure is most concentrated on the peripheral edge of the combustion chamber hole 72 due to the plate thickness difference between the overlapping portion 77 and the outer portion of the peripheral edge of the combustion chamber hole 72, which has the thickest plate thickness. The maximum load acts on the periphery of the parts to seal the joint surfaces.
【0035】このとき、上述したように、環状板73の
熱膨張率を基板71の熱膨張率より大きくし、且つ、環
状板73の幅を基板71の折り返し幅より長くして外周
部を該折り返し部分より外側に配置すると共に該外周部
を基板71に接合しているため、重合部77で環状板7
3がエンジンの熱により膨張(伸長)して上方に湾曲
し、これにより、基板71の折り返し部分を開く方向
(板厚方向)に変形する(図8(b)参照)。At this time, as described above, the coefficient of thermal expansion of the annular plate 73 is made larger than that of the substrate 71, and the width of the annular plate 73 is made longer than the folded width of the substrate 71 so that the outer peripheral portion is Since the outer peripheral portion is arranged on the outer side of the folded portion and the outer peripheral portion is joined to the substrate 71, the annular plate 7 is formed by the overlapping portion 77.
3 expands (extends) by the heat of the engine and bends upward, thereby deforming the folded portion of the substrate 71 in the opening direction (plate thickness direction) (see FIG. 8B).
【0036】これにより、燃焼室孔72の周縁部の重合
部77がバネ性に乏しくても、エンジンの熱によるシリ
ンダヘッドおよびシリンダブロックの変形に重合部77
が良好に追従し、この結果、シリンダヘッドとシリンダ
ブロックとの間に隙間が発生しても良好なシール性を確
保することができる。なお、本発明の重合部等の構成は
上記各実施の形態に限定されるものではなく、本発明の
要旨を逸脱しない範囲で適宜変更可能である。As a result, even if the overlapping portion 77 at the peripheral portion of the combustion chamber hole 72 has a poor spring property, the overlapping portion 77 is deformed due to the deformation of the cylinder head and the cylinder block due to the heat of the engine.
Satisfactorily follows, and as a result, good sealing performance can be secured even if a gap occurs between the cylinder head and the cylinder block. The configuration of the polymerizing portion and the like of the present invention is not limited to the above-mentioned embodiments, and can be changed as appropriate without departing from the scope of the present invention.
【0037】例えば、図2〜図4、図7〜図8の金属ガ
スケットに例えば図5等のフルビード及び/又は例えば
図6等のハーフビードを設けるようにしてもよい。For example, the metal gaskets shown in FIGS. 2 to 4 and 7 to 8 may be provided with the full beads shown in FIG. 5 and / or the half beads shown in FIG. 6, for example.
【0038】[0038]
【発明の効果】上記の説明から明らかなように、本発明
によれば、エンジンの熱によるシリンダヘッドとシリン
ダブロックの変形が大きい場合でも良好なシール性を確
保することができるという効果が得られる。As is apparent from the above description, according to the present invention, it is possible to obtain an excellent sealability even when the cylinder head and the cylinder block are largely deformed by the heat of the engine. .
【図1】本発明の実施の形態の一例である金属ガスケッ
トを説明するための平面図である。FIG. 1 is a plan view for explaining a metal gasket that is an example of an embodiment of the present invention.
【図2】図1のA−A線断面図で、(a)は重合部の熱
変形前、(b)は重合部の熱変形後である。2 is a cross-sectional view taken along the line AA in FIG. 1, where (a) is before thermal deformation of the overlapping portion and (b) is after thermal deformation of the overlapping portion.
【図3】本発明の第2の実施の形態である金属ガスケッ
トを説明するための断面図で、(a)は重合部の熱変形
前、(b)は重合部の熱変形後である。3A and 3B are cross-sectional views illustrating a metal gasket according to a second embodiment of the present invention, in which FIG. 3A is before thermal deformation of a polymerized portion and FIG. 3B is after thermal deformation of a polymerized portion.
【図4】本発明の第3の実施の形態である金属ガスケッ
トを説明するための断面図で、(a)は重合部の熱変形
前、(b)は重合部の熱変形後である。4A and 4B are cross-sectional views for explaining a metal gasket according to a third embodiment of the present invention, where FIG. 4A is before thermal deformation of a polymerized portion and FIG. 4B is after thermal deformation of a polymerized portion.
【図5】本発明の第4の実施の形態である金属ガスケッ
トを説明するための断面図で、(a)は重合部の熱変形
前、(b)は重合部の熱変形後である。5A and 5B are cross-sectional views for explaining a metal gasket according to a fourth embodiment of the present invention, where FIG. 5A is before thermal deformation of a polymerized portion and FIG. 5B is after thermal deformation of a polymerized portion.
【図6】本発明の第5の実施の形態である金属ガスケッ
トを説明するための断面図で、(a)は重合部の熱変形
前、(b)は重合部の熱変形後である。6A and 6B are cross-sectional views for explaining a metal gasket according to a fifth embodiment of the present invention, where FIG. 6A is before thermal deformation of a polymerized portion and FIG. 6B is after thermal deformation of a polymerized portion.
【図7】本発明の第6の実施の形態である金属ガスケッ
トを説明するための断面図で、(a)は重合部の熱変形
前、(b)は重合部の熱変形後である。7A and 7B are cross-sectional views illustrating a metal gasket according to a sixth embodiment of the present invention, in which FIG. 7A is before thermal deformation of a polymerized portion and FIG. 7B is after thermal deformation of a polymerized portion.
【図8】本発明の第7の実施の形態である金属ガスケッ
トを説明するための断面図で、(a)は重合部の熱変形
前、(b)は重合部の熱変形後である。8A and 8B are cross-sectional views for explaining a metal gasket according to a seventh embodiment of the present invention, where FIG. 8A is before thermal deformation of a polymerized portion and FIG. 8B is after thermal deformation of a polymerized portion.
10…金属ガスケット 11a,11b…基板(金属板) 12…燃焼室孔 17…重合部 43…フルビード 53…ハーフビード 10 ... Metal gasket 11a, 11b ... Substrate (metal plate) 12 ... Combustion chamber hole 17 ... Polymerization section 43 ... Full bead 53 ... Half bead
Claims (4)
接合面間に介装して締結ボルトで締め付けることによ
り、前記接合面間をシールするようにした金属ガスケッ
トであって、 熱膨張率の異なる少なくとも2枚の金属板を板厚方向に
重合した重合部を備え、各金属板の熱膨張率の違いを利
用してエンジンの熱により前記重合部を板厚方向に変形
可能に構成したことを特徴とする金属ガスケット。1. A metal gasket, which is interposed between the joint surfaces of a cylinder head and a cylinder block and is tightened with fastening bolts to seal the joint surfaces, the metal gasket having at least two different thermal expansion coefficients. It is characterized by comprising a polymerized portion obtained by polymerizing the metal plates in the plate thickness direction, and by utilizing the difference in the coefficient of thermal expansion of each metal plate, the polymerized part can be deformed in the plate thickness direction by the heat of the engine. Metal gasket to be used.
て前記重合部としたことを特徴とする請求項1記載の金
属ガスケット。2. The metal gasket according to claim 1, wherein a peripheral portion of the combustion chamber hole is thicker than other portions to form the overlapping portion.
記重合部としたことを特徴とする請求項1又は2記載の
金属ガスケット。3. The metal gasket according to claim 1, wherein a bead provided around a combustion chamber hole is used as the overlapping portion.
としたことを特徴とする請求項1〜3のいずれか一項に
記載の金属ガスケット。4. The metal gasket according to claim 1, wherein a bead provided on an outer peripheral edge is used as the overlapping portion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002115378A JP2003314363A (en) | 2002-04-17 | 2002-04-17 | Metal gasket |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2002115378A JP2003314363A (en) | 2002-04-17 | 2002-04-17 | Metal gasket |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2003314363A true JP2003314363A (en) | 2003-11-06 |
Family
ID=29533708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002115378A Pending JP2003314363A (en) | 2002-04-17 | 2002-04-17 | Metal gasket |
Country Status (1)
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JP (1) | JP2003314363A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2017099206A1 (en) * | 2015-12-11 | 2018-09-13 | Nok株式会社 | Metal gasket |
JPWO2018011932A1 (en) * | 2016-07-14 | 2018-11-08 | 新日鐵住金株式会社 | gasket |
-
2002
- 2002-04-17 JP JP2002115378A patent/JP2003314363A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2017099206A1 (en) * | 2015-12-11 | 2018-09-13 | Nok株式会社 | Metal gasket |
US11248704B2 (en) | 2015-12-11 | 2022-02-15 | Nok Corporation | Metal gasket |
JPWO2018011932A1 (en) * | 2016-07-14 | 2018-11-08 | 新日鐵住金株式会社 | gasket |
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