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 |
|---|---|---|---|
| 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)
| Country | Link |
|---|---|
| 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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