JP2013079667A

JP2013079667A - Gasket

Info

Publication number: JP2013079667A
Application number: JP2011219447A
Authority: JP
Inventors: Masaru Mori; 大森; Tomokazu Tsunoda; 友和角田; Koichi Tsumura; 宏一津村
Original assignee: Uchiyama Manufacturing Corp
Current assignee: Uchiyama Manufacturing Corp
Priority date: 2011-10-03
Filing date: 2011-10-03
Publication date: 2013-05-02
Anticipated expiration: 2031-10-03
Also published as: JP5787158B2

Abstract

PROBLEM TO BE SOLVED: To provide a novel gasket for properly maintaining the seal function even when a thermal expansion difference is caused between two members, without infiltrating a seal object medium into an installation groove, by surely exhibiting the fall preventive function and the meandering preventive function.SOLUTION: This gasket 3 is fitted in the annular installation groove 10 formed in any one of a first member 1 and a second member 2, and includes an annular gasket body 30 of a shape along the installation groove, a plurality of vertical ribs 31 constituted of a projection strip body arranged at an interval in the peripheral direction of the gasket body along the height direction H corresponding to the depth direction F of the installation groove of the gasket body on a side surface of the gasket body opposed to a sidewall 10a of the installation groove, and a horizontal rib 32 constituted of a projection strip body continuously arranged over the whole periphery of the gasket body on the side surface, and the plurality of vertical ribs are formed in a separated state from the horizontal rib in a position opposed to the height direction by sandwiching the horizontal rib.

Description

本発明は、対向配置される第１部材及び第２部材の対向面のいずれか一方に形成された環状の取付溝に嵌め入れられ、締結部材によって対向して締結される前記第１部材と前記第２部材との間を密封するガスケットに関し、例えば、内燃機関におけるシリンダヘッドとインテークマニホールドとの間、或いはシリンダヘッドとヘッドカバーとの間を、シールするガスケットに関する。 The present invention includes the first member that is fitted into an annular mounting groove formed on either one of the opposing surfaces of the first member and the second member that are arranged to face each other, and is fastened oppositely by a fastening member. The present invention relates to a gasket that seals between a second member and, for example, a gasket that seals between a cylinder head and an intake manifold in an internal combustion engine or between a cylinder head and a head cover.

前記のように、第１部材及び第２部材の対向面のいずれか一方に形成された環状の取付溝に嵌め入れられ、締結部材によって対向して締結される前記第１部材と前記第２部材との間を密封するガスケットの例として、特許文献１〜８に記載されたものが挙げられる。特許文献１，２に記載されたガスケットは、取付溝に装着した際の安定性を図るために、取付溝の側壁に対向する側面に、周方向に適宜間隔をもって形成された複数の縦リブ状の突部を備えている。また、特許文献３〜５に記載されたガスケットは、取付溝に装着した際の安定性（脱落防止、倒れ防止等）を図るために、取付溝の側壁に対向する側面に、全周に亘って形成された横リブ状の突部を備えている。さらに、特許文献６〜８には、側面に周方向に適宜間隔を開けて形成された複数の縦リブ状の突部と、これら縦リブ状の突部に交差し全周に亘って形成された横リブ状の突部とを備えたガスケットが記載されている。そして、特許文献６〜８における縦リブ状の突部は、いずれも、ガスケットを取付溝に装着する際の脱落を防止する機能を奏するものであるとされている。また、特許文献７に記載された横リブ状の突部（ビード）は、取付溝に装着した後に圧縮安定性を確保するものであるとされ、この圧縮安定性は、倒れ防止機能であると想定される。特許文献６，８に記載された横リブ状の突部については、いずれも、図示はされているが、符号は付されておらず、どのような機能を奏するものかの説明はない。 As described above, the first member and the second member, which are fitted into an annular mounting groove formed on one of the opposing surfaces of the first member and the second member, and are opposed and fastened by a fastening member. Examples of gaskets that seal between the two are those described in Patent Documents 1 to 8. The gaskets described in Patent Documents 1 and 2 have a plurality of vertical ribs formed on the side surface facing the side wall of the mounting groove at appropriate intervals in the circumferential direction in order to ensure stability when mounted in the mounting groove. It has a protrusion. In addition, the gaskets described in Patent Documents 3 to 5 are provided over the entire circumference on the side surface facing the side wall of the mounting groove in order to achieve stability (prevention of dropping, prevention of falling, etc.) when mounted in the mounting groove. It is provided with a lateral rib-shaped protrusion formed as described above. Further, in Patent Documents 6 to 8, a plurality of vertical rib-shaped protrusions formed on the side surfaces at appropriate intervals in the circumferential direction, and these vertical rib-shaped protrusions are formed over the entire circumference. A gasket with a lateral rib-shaped protrusion is described. And the vertical rib-shaped protrusions in Patent Documents 6 to 8 all have a function of preventing a dropout when the gasket is mounted in the mounting groove. Further, the lateral rib-shaped protrusions (beads) described in Patent Document 7 are said to secure compression stability after being mounted in the mounting groove, and this compression stability is a function of preventing collapse. is assumed. The lateral rib-shaped protrusions described in Patent Documents 6 and 8 are all illustrated, but are not labeled, and there is no description of what function they perform.

実公昭４７−４０１９２号公報Japanese Utility Model Publication No. 47-40192 実開昭６２−７５２６２号公報Japanese Utility Model Publication No. 62-75262 実開昭５９−３７４６４号公報Japanese Utility Model Publication No. 59-37464 特開２００８−２８１１１０号公報JP 2008-281110 A 特開２０１０−１３８９５７号公報JP 2010-138957 A 特開２００８−２４９０９６号公報JP 2008-249096 A 特開２００８−２６１３５１号公報JP 2008-261351 A 特開２０１０−２４９２７０号公報JP 2010-249270 A

ところで、特許文献１及び２に記載されたガスケットにおける縦リブ状の突部は、当該ガスケットの取付溝に対する装着時の、姿勢保持（倒れ、ずれの防止）、脱落の防止等を意図するものと解される。しかし、前記突部がガスケットの周方向に間隔を開けて形成されているので、突部間での倒れがなお生じる懸念がある。また、突部と突部の間は、ガスケット側面と対向する溝側壁との接触度合いが弱いため、シール対象の媒体がこの部分から浸入して取付溝の底部に至り、浸入した媒体がガスケットを劣化させ、シール性が経時的に低下する可能性もある。さらに、取付溝に対する装着時における突部間の溝側壁に対する干渉が少ないので、ガスケットが蛇行した状態で溝に装着されることも予想される。一方、特許文献３，４に記載されたガスケットにおける横リブ状の突部も、取付溝に対する装着時の姿勢保持、或いは脱落の防止等を意図するものと解される。しかし、これら横リブ状の突部は、ガスケットの各側面に１列（１条）形成されているだけであるから、倒れ防止機能は充分とは言い難いものである。 By the way, the longitudinal rib-shaped protrusions in the gaskets described in Patent Documents 1 and 2 are intended to maintain the posture (prevention of falling and slipping), prevent falling off, etc. when the gasket is attached to the mounting groove. It is understood. However, since the protrusions are formed with a gap in the circumferential direction of the gasket, there is a concern that the collapse between the protrusions still occurs. In addition, since the degree of contact between the protrusions and the groove side wall facing the gasket side wall is weak, the medium to be sealed enters from this portion and reaches the bottom of the mounting groove. There is also a possibility that the sealing performance will deteriorate with time. Further, since there is little interference with the groove side wall between the protrusions when the mounting groove is mounted, it is expected that the gasket is mounted in the groove in a meandering state. On the other hand, it is understood that the rib-like protrusions in the gaskets described in Patent Documents 3 and 4 are also intended to maintain the posture at the time of mounting on the mounting groove or prevent the dropout. However, since these lateral rib-shaped protrusions are only formed in one row (one strip) on each side of the gasket, it is difficult to say that the fall prevention function is sufficient.

これに対し、特許文献５には、横リブ状の突部が、ガスケットの各側面に上下２列に形成されている。しかし、このように上下２列の横リブ状の突部を設けた場合、前記装着時の姿勢保持、或いは脱落の防止機能は改善されるが、溝の側壁との接触面積が増加し、相手部材（取付溝が形成されていない方の部材）との追従性が悪くなってシール性が低下することになる。即ち、この種のガスケットによる密封構造では、第１部材及び第２部材の一方の部材が合成樹脂の成型体からなる例も多い。このように一方の部材が合成樹脂の成型体からなる場合、他方の部材との熱膨張差が大きく、この熱膨張差のため締結部材間で両部材の対向面の間隔が広がるような変動が発生する。従って、ガスケットが溝の側面に強く密着していると、この密着力によってガスケットの弾性復元力が規制され、ガスケットが、前記間隔が広がるような変動に伴って他方の部材の対向面に追従し難く、両シール面間のシール機能が低下することになる。 On the other hand, in patent document 5, the protrusion part of a horizontal rib shape is formed in the upper and lower two rows on each side surface of a gasket. However, when two horizontal rib-shaped protrusions are provided in this way, the posture holding function or the prevention function of dropping is improved, but the contact area with the side wall of the groove increases, The followability with the member (the member on which the mounting groove is not formed) is deteriorated and the sealing performance is lowered. That is, in this type of sealing structure using a gasket, there are many examples in which one of the first member and the second member is formed of a synthetic resin molding. Thus, when one member is made of a synthetic resin molded body, the difference in thermal expansion with the other member is large, and due to this difference in thermal expansion, there is a fluctuation that the interval between the opposing surfaces of both members is widened between the fastening members. Occur. Therefore, when the gasket is in close contact with the side surface of the groove, the elastic restoring force of the gasket is regulated by this adhesion force, and the gasket follows the opposite surface of the other member as the gap increases. It is difficult, and the sealing function between both sealing surfaces will be reduced.

特許文献６〜８には、縦リブ状の突部と、横リブ状の突部とを備えたガスケットが示されている。しかし、特許文献６，８に記載された横リブ状の突部については、説明がないためにどのような機能を奏するものか定かではない。また、特許文献７に記載された横リブ状の突部（ビード）は、上述のとおり、取付溝に装着した後の圧縮安定性、即ち、倒れ防止機能を確保するものであると想定される。しかし、添付図等の記載から、この横リブ状の突部のガスケットの側面における突出高さは、縦リブ状の突部の突出高さより低く形成されている。そのため、横リブ状の突部と溝の側壁とを充分に接触させシールすることができず、前記と同様に、シール対象媒体が溝の底部に浸入してガスケットを劣化させる懸念がある。また、このように横リブ状の突部と溝の側壁とを充分に接触させることができない場合は、ガスケットを溝に装着した際に、ガスケットが蛇行する要因になることが予想される。更に、縦リブ状の突部と横リブ状の突部とが一体に連接されているから、ガスケットが取付溝内で圧縮され弾性変形する際、横リブ状の突部が縦リブ状の突部の影響を受け、溝側壁に対し周方向全体に亘り均一に接触しなくなることがある。このように、均一な接触状態が得られないと、横リブ状の突部による溝側壁との側面補助シール機能が充分に発揮されず、シール対象媒体の取付溝の底部への浸入を防止することが難しくなる。 Patent Documents 6 to 8 show a gasket having a vertical rib-shaped protrusion and a horizontal rib-shaped protrusion. However, since the lateral rib-shaped protrusions described in Patent Documents 6 and 8 are not described, it is not certain what function they perform. Further, as described above, the lateral rib-shaped protrusions (beads) described in Patent Document 7 are assumed to ensure the compression stability after being mounted in the mounting groove, that is, the fall prevention function. . However, from the description of the attached drawings and the like, the protruding height of the lateral rib-shaped protrusion on the side surface of the gasket is formed lower than the protruding height of the vertical rib-shaped protrusion. For this reason, the lateral rib-shaped protrusion and the side wall of the groove cannot be sufficiently contacted and sealed, and there is a concern that the medium to be sealed enters the bottom of the groove and deteriorates the gasket as described above. Further, when the lateral rib-shaped protrusions and the side walls of the groove cannot be sufficiently brought into contact with each other, it is expected that the gasket meanders when the gasket is mounted in the groove. Further, since the vertical rib-shaped protrusions and the horizontal rib-shaped protrusions are integrally connected, when the gasket is compressed in the mounting groove and elastically deformed, the horizontal rib-shaped protrusions become the vertical rib-shaped protrusions. Under the influence of the portion, the groove side wall may not be uniformly contacted over the entire circumferential direction. Thus, unless a uniform contact state is obtained, the side auxiliary seal function with the side wall of the groove by the lateral rib-shaped protrusions is not sufficiently exerted, and the penetration of the medium to be sealed into the bottom of the mounting groove is prevented. It becomes difficult.

本発明は、上記に鑑みなされたもので、倒れ防止機能及び蛇行防止機能が確実に発揮され、シール対象媒体の取付溝への浸入を生じさせず、且つ、２部材に熱膨張差が生じる場合でもシール機能が適正に維持される新規なガスケットを提供することを目的としている。 The present invention has been made in view of the above, and when the fall prevention function and the meander prevention function are reliably exhibited, the medium to be sealed does not enter the mounting groove, and there is a difference in thermal expansion between the two members. However, it aims to provide a new gasket that maintains the sealing function properly.

本発明に係るガスケットは、対向配置される第１部材及び第２部材の対向面のいずれか一方に形成された環状の取付溝に嵌め入れられ、締結部材によって対向して締結される前記第１部材と前記第２部材との間を密封するガスケットにおいて、前記取付溝に沿った形状の環状のガスケット本体と、前記取付溝の側壁に対向する前記ガスケット本体の側面に、該ガスケット本体の前記取付溝の深さ方向に相当する高さ方向に沿い且つ該ガスケット本体の周方向に間隔を空けて設けられた凸条体からなる複数の縦リブと、前記側面に、前記ガスケット本体の全周に亘り連なって設けられた凸条体からなる横リブとを備え、前記複数の縦リブは、前記横リブを挟んで前記高さ方向に相対する位置に、前記横リブと分離した状態で形成されていることを特徴とする。 The gasket according to the present invention is fitted in an annular mounting groove formed on one of the opposing surfaces of the first member and the second member arranged to face each other, and is fastened oppositely by a fastening member. A gasket for sealing between a member and the second member, wherein the gasket main body is formed on an annular gasket main body having a shape along the mounting groove, and on a side surface of the gasket main body facing a side wall of the mounting groove. A plurality of vertical ribs made of ridges provided along the height direction corresponding to the depth direction of the groove and spaced in the circumferential direction of the gasket body, on the side surface, on the entire circumference of the gasket body A plurality of vertical ribs formed in a state separated from the horizontal ribs at positions opposed to the height direction across the horizontal ribs. What And features.

本発明に係るガスケットは、対向配置される第１部材及び第２部材の対向面のいずれか一方に形成された環状の取付溝に嵌め入れられ、第１部材及び第２部材を締結部材によって締結することにより、取付溝を有する一方の対向面と他方の対向面との間に圧縮された状態で介在する。両対向面間に、当該ガスケットが圧縮された状態で介在することにより、前記第１部材と前記第２部材との間が密封される。また、前記取付溝の側壁に対向する前記ガスケット本体の側面には、複数の縦リブ及び横リブが形成されているから、前記締結過程で、取付溝内でのガスケットの倒れが生じることを防止することができる。そして、横リブがガスケット本体の全周に亘り連なって形成されていることにより、横リブが取付溝の側壁に干渉し、ガスケットの蛇行も生じ難くなる。特に、縦リブは、ガスケット本体の高さ方向に沿って設けられているから、締結過程でガスケットが倒れようとしても、縦リブが取付溝の側壁に干渉してそれ以上に倒れることがない。また、縦リブは周方向に間隔を開けて設けられているが、隣接する縦リブ間には、横リブが存在するから、隣接する縦リブの間隔が大きくても、この部分では横リブが取付溝の側壁に干渉し、この部分でのガスケットの倒れが阻止されるとともに、ガスケットの周方向に沿った蛇行も阻止される。 The gasket according to the present invention is fitted into an annular mounting groove formed on one of the opposing surfaces of the first member and the second member arranged to face each other, and the first member and the second member are fastened by a fastening member. By doing so, it is interposed in a compressed state between one opposing surface having the mounting groove and the other opposing surface. By interposing the gasket in a compressed state between both opposing surfaces, the space between the first member and the second member is sealed. Further, since a plurality of vertical ribs and horizontal ribs are formed on the side surface of the gasket body facing the side wall of the mounting groove, it is possible to prevent the gasket from collapsing in the mounting groove during the fastening process. can do. Since the lateral rib is formed continuously over the entire circumference of the gasket body, the lateral rib interferes with the side wall of the mounting groove, and the meandering of the gasket hardly occurs. In particular, since the vertical rib is provided along the height direction of the gasket main body, even if the gasket is about to fall during the fastening process, the vertical rib does not interfere with the side wall of the mounting groove and fall further. In addition, although the vertical ribs are provided at intervals in the circumferential direction, since there are horizontal ribs between adjacent vertical ribs, even if the interval between adjacent vertical ribs is large, the horizontal ribs are not present in this portion. It interferes with the side wall of the mounting groove, and the gasket is prevented from falling at this portion, and meandering along the circumferential direction of the gasket is also prevented.

さらに、ガスケット本体の周方向に間隔を空けて設けられた複数の縦リブと、ガスケット本体の全周に亘り連なって設けられた一つの横リブと、を備えているから、横リブを上下２段に配した構造に比べ、取付溝の側壁と横リブ及び縦リブを介したガスケット全体との接触面積を小さくすることができる。従って、前記圧縮の際に、ガスケットの取付溝の側壁方向への変形により生じる応力が小さくなる。さらに、この取付溝の側壁方向への変形は、取付溝の側壁により抑制されるため、これによって生じる圧縮方向（締結方向）への変形による圧縮方向のシール反力の増加を抑えることができ、シール反力を適切な状態に維持することができる。また、ガスケットが取付溝の側壁を押す力が小さくなるため、両リブの取付溝の側壁に貼り付きにくいものとすることができる。これによって、例えば、第１部材或いは第２部材が熱膨張差によって、対向面間に前記変動が発生した場合でも、ガスケットがこれに伴って弾性復元し、この変動に対して追従することができるので、対向面間において優れたシール性が発揮される。そして、縦リブを、横リブを高さ方向に挟んだ位置に、横リブと分離した状態で形成しているから、ガスケットを圧縮した際に、横リブが縦リブとは独立して変形し、縦リブの影響を受けず取付溝の側壁面に均一に接触する。この均一な接触により、安定した側面補助シールができ、シール対象媒体の溝底までの浸入を効果的に防止する。さらに、縦リブが、横リブを挟んで前記高さ方向に相対する位置に形成されているから、ガスケットの圧縮過程における倒れ防止が的確になされる。 Furthermore, since it has a plurality of vertical ribs provided at intervals in the circumferential direction of the gasket main body and one horizontal rib provided continuously over the entire circumference of the gasket main body, the horizontal ribs Compared with the structure arranged in steps, the contact area between the side wall of the mounting groove and the entire gasket via the lateral rib and the longitudinal rib can be reduced. Therefore, during the compression, the stress generated by the deformation of the gasket mounting groove in the side wall direction is reduced. Furthermore, since the deformation of the mounting groove in the side wall direction is suppressed by the side wall of the mounting groove, an increase in the seal reaction force in the compression direction due to the deformation in the compression direction (fastening direction) caused thereby can be suppressed. The seal reaction force can be maintained in an appropriate state. Moreover, since the force with which a gasket pushes the side wall of an attachment groove becomes small, it can be made hard to stick to the side wall of the attachment groove of both ribs. Thereby, for example, even when the first member or the second member has the above-described fluctuation between the opposing surfaces due to a difference in thermal expansion, the gasket can be elastically restored along with the fluctuation and can follow the fluctuation. Therefore, excellent sealing performance is exhibited between the opposing surfaces. And since the vertical rib is formed in a state where the horizontal rib is sandwiched in the height direction and separated from the horizontal rib, the horizontal rib is deformed independently of the vertical rib when the gasket is compressed. The contact with the side wall surface of the mounting groove is not affected by the vertical ribs. By this uniform contact, a stable side auxiliary seal can be obtained, and the penetration of the medium to be sealed to the groove bottom is effectively prevented. Furthermore, since the vertical rib is formed at a position facing the height direction across the horizontal rib, the collapse of the gasket in the compression process is accurately prevented.

本発明において、前記横リブの前記側面からの突出高さが、前記縦リブの前記側面からの突出高さ以下の高さとされていても良い。これによれば、ガスケットが圧縮されて取付溝の側壁方向へ圧縮変形する際、横リブが溝の側壁面に過剰に接触せず、圧縮方向への過剰な反力が生じない。これによって、横リブが取付溝の側壁面に貼り付きにくいものとすることができ、第１部材及び第２部材の熱変形差による前記変動に対する追従性が維持され、前記変動があっても、第１部材及び第２部材間のシール性の低下がより生じ難くなる。 In this invention, the protrusion height from the said side surface of the said horizontal rib may be made into the height below the protrusion height from the said side surface of the said vertical rib. According to this, when the gasket is compressed and compressed and deformed in the direction of the side wall of the mounting groove, the lateral rib does not excessively contact the side wall surface of the groove, and an excessive reaction force in the compression direction does not occur. This makes it difficult for the lateral ribs to stick to the side wall surface of the mounting groove, the followability to the variation due to the thermal deformation difference between the first member and the second member is maintained, and even if there is the variation, Decrease in the sealing performance between the first member and the second member is less likely to occur.

本発明において、前記横リブが、ガスケット本体における前記側面の前記高さ方向中央部に設けられているものとしても良い。これによれば、ガスケットが上下方向から圧縮された際に、ガスケット本体の高さ方向中央部が最もその直交する方向へ膨み易いため、横リブが、より縦リブの影響を受けずに溝の側壁面に均一に接触する。そのため、この部分と取付溝の側壁との干渉によって、より一層ガスケットの倒れ及びシール対象媒体の浸入を効果的に防止することができる。また、隣接する縦リブ間でのガスケットの蛇行の発生をより効果的に抑制することができる。 In the present invention, the lateral rib may be provided at a central portion in the height direction of the side surface of the gasket body. According to this, when the gasket is compressed from the vertical direction, the central portion in the height direction of the gasket body is most likely to swell in the direction perpendicular thereto, so that the horizontal rib is not affected by the vertical rib, and the groove Uniformly contact the side wall surface. Therefore, it is possible to effectively prevent the gasket from further falling and the medium to be sealed from entering due to the interference between this portion and the side wall of the mounting groove. Further, it is possible to more effectively suppress the occurrence of meandering of the gasket between adjacent vertical ribs.

本発明において、前記ガスケット本体の断面形状が、前記高さ方向中央の横断線を対称軸として線対称に、且つ、前記高さ方向に直交する幅方向中央の縦断線を対称軸として線対称に形成され、前記縦リブ及び前記横リブが、前記ガスケット本体の両側部の前記側面に前記縦断線を対称軸として線対称に形成されているものとしても良い。これによれば、ガスケットを前記取付溝に嵌め入れる向きはいずれでもよくなるので、上下反転して嵌め入れても、同様の効果を発揮し得る。よって、ガスケットの嵌め入れ間違いを起こすことがない。この場合、横リブが、前記のようにガスケット本体における前記側面の前記高さ方向中央部に設けられていれば、より一層ガスケットを嵌め入れる向きが限定されなくなる。 In the present invention, the cross-sectional shape of the gasket body is axisymmetric with respect to the transverse line at the center in the height direction as an axis of symmetry, and is symmetrical with respect to a longitudinal line at the center in the width direction orthogonal to the height direction as the axis of symmetry. The vertical ribs and the horizontal ribs may be formed symmetrically on the side surfaces of both sides of the gasket body with the vertical line as the axis of symmetry. According to this, since the direction in which the gasket is fitted into the mounting groove may be any, even if the gasket is fitted upside down, the same effect can be exhibited. Therefore, there is no mistake in fitting the gasket. In this case, if the lateral rib is provided at the center portion in the height direction of the side surface of the gasket body as described above, the direction in which the gasket is further fitted is not limited.

本発明において、前記横リブ及び縦リブの断面形状が、いずれも山形の形状とされ、且つその頂部をとおり前記ガスケット本体の側面に垂直な線を対称軸として線対称に形成されているものとしても良い。これによれば、前記締結時におけるこれらリブの圧縮弾性変形が均一になされ、前記のシール対象媒体の浸入阻止機能や、蛇行防止機能、倒れ防止機能、さらには前記変動に伴う追従性等が適正に発揮される。 In the present invention, it is assumed that the cross-sectional shapes of the horizontal ribs and the vertical ribs are both chevron-shaped and are symmetrical with respect to a line passing through the top and perpendicular to the side surface of the gasket body. Also good. According to this, the compression elastic deformation of these ribs at the time of fastening is made uniform, and the intrusion prevention function of the medium to be sealed, the meandering prevention function, the fall prevention function, and the followability accompanying the fluctuation are appropriate. To be demonstrated.

本発明のガスケットによれば、倒れ防止機能及び蛇行防止機能が確実に発揮され、特に、横リブが縦リブの影響を受けることなく、シール対象媒体の取付溝への浸入を防止する機能を発揮し、且つ、２部材に熱膨張差が生じる場合でもシール機能が適正に維持される。 According to the gasket of the present invention, the fall prevention function and the meandering prevention function are reliably exhibited, and in particular, the horizontal rib is not affected by the vertical rib, and the function of preventing the medium to be sealed from entering the mounting groove is exhibited. In addition, even when a difference in thermal expansion occurs between the two members, the sealing function is properly maintained.

本発明のガスケットが適用される第１部材及び第２部材の締結状態を示す要部の断面図と、一部の拡大図である。It is sectional drawing of the principal part which shows the fastening state of the 1st member and 2nd member to which the gasket of this invention is applied, and one part enlarged view. 本発明のガスケットの一実施形態を模式的に示す部分破断斜視図である。It is a partial fracture perspective view showing typically one embodiment of the gasket of the present invention. 同実施形態のガスケットの一部を示す平面図である。It is a top view which shows a part of gasket of the embodiment. 第１部材及び第２部材の締結前の状態を示す図１の拡大図に対応する図と、その一部をさらに拡大した図である。It is the figure corresponding to the enlarged view of FIG. 1 which shows the state before the fastening of a 1st member and a 2nd member, and the figure which expanded the part further. 図４におけるＸ−Ｘ線矢視断面図である。FIG. 5 is a cross-sectional view taken along line XX in FIG. 4. 本発明のガスケットの他の実施形態を示す図４と同様図である。It is a figure similar to FIG. 4 which shows other embodiment of the gasket of this invention.

以下に本発明の実施の形態について、図面に基づいて説明する。図１は、内燃機関におけるインテークマニホールド（第１部材）１とシリンダヘッド（第２部材）２との間を、ガスケット３を介して密封する密封構造を示している。インテークマニホールド１及びシリンダヘッド２は、それぞれの対向面１ａ，２ａが対向するよう配置される。インテークマニホールド１は合成樹脂の成型体からなり、燃料混合気（シール対象媒体）の流通路としてのシール対象空所１ｂを有し、該インテークマニホールド１の前記対向面１ａには、ガスケット３を嵌め入れて装着するための取付溝１０が凹設されている。該対向面１ａは、前記シール対象空所１ｂの開口部回りに環状に形成され、取付溝１０は、環状の対向面１ａの周方向に沿って環状に凹設されている。取付溝１０は、対向面１ａに垂直な方向が溝深さ方向Ｆとなるよう、断面形状が方形状に形成されている。シリンダヘッド２は、アルミニウム等の金属製鋳造体からなり、インテークマニホールド１からの前記混合気の流入路としてシール対象空所２ｂを有している。前記対向面２ａは平坦面とされ、前記シール対象空所２ｂの開口部回りに形成されている。インテークマニホールド１及びシリンダヘッド２は、前記取付溝１０にガスケット３を装着した状態で、対向面１ａ，２ａが互いに対向関係で合体するよう、ボルト（締結部材）４によって、ガスケット３の圧縮を伴い対向して締結される。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sealing structure in which an intake manifold (first member) 1 and a cylinder head (second member) 2 in an internal combustion engine are sealed via a gasket 3. The intake manifold 1 and the cylinder head 2 are arranged so that the opposing surfaces 1a and 2a face each other. The intake manifold 1 is made of a synthetic resin molded body and has a sealing target space 1b as a flow path for a fuel mixture (medium to be sealed). A gasket 3 is fitted on the facing surface 1a of the intake manifold 1. A mounting groove 10 for inserting and mounting is recessed. The facing surface 1a is formed in an annular shape around the opening of the sealing target space 1b, and the mounting groove 10 is annularly recessed along the circumferential direction of the annular facing surface 1a. The mounting groove 10 has a square cross-sectional shape so that the direction perpendicular to the facing surface 1a is the groove depth direction F. The cylinder head 2 is made of a cast metal made of metal such as aluminum, and has a sealing target space 2b as an inflow path of the air-fuel mixture from the intake manifold 1. The facing surface 2a is a flat surface and is formed around the opening of the sealing target space 2b. Intake manifold 1 and cylinder head 2 are accompanied by compression of gasket 3 by means of bolts (fastening members) 4 so that opposing surfaces 1a and 2a are joined together in a facing relationship with gasket 3 mounted in mounting groove 10. Fastened opposite.

ガスケット３は、ＦＫＭ，ＮＢＲ，Ｈ−ＮＢＲ，ＥＰＤＭ，ＣＲ，ＡＣＭ，ＡＥＭ，ＶＭＱ及びＦＶＭＱ等のゴム材による加硫成型体からなり、前記環状の取付溝１０に嵌まり得る環状の形状に形成されている。該ガスケット３は、全体形状が取付溝１０に沿った環状の形状のガスケット本体３０を有している。該ガスケット本体３０は、図１〜図４に示すように、断面形状が前記取付溝１０の深さ方向Ｆに相当する高さ方向Ｈに沿って縦長で、高さ方向中央の横断線Ｌ１を対称軸として線対称に、且つ、前記高さ方向Ｈに直交する幅方向中央の縦断線Ｌ２を対称軸として線対称に形成されている（図４参照）。そして、ガスケット本体３０の前記取付溝１０の両側壁（内壁）１０ａ，１０ａに対向する側面３０ａ，３０ａは、いずれも前記高さ方向Ｈに平行とされ、ガスケット本体３０の高さ方向の上下端部３０ｂ，３０ｃは、断面三角形状とされている。また、ガスケット本体３０の高さは、前記取付溝１０の深さより大とされ、図４に示すように、取付溝１０に、上端部３０ｂがその底壁１０ｂに当接するよう嵌め入れられたときには、下端部３０ｃを含む部分が取付溝１０の開口部１０ｃより下方に突出するように形成されている。
なお、本明細書において、上及び下なる用語は、前記高さ方向Ｈに沿って、各図の紙面上側が上、下側が下、をそれぞれ意味するものとする。また、前記上下端部３０ｂ，３０ｃの形状は、断面三角形状に限らず、フラットな形状や、円弧形状、その他の形状であっても良い。 The gasket 3 is made of a vulcanized molded body made of a rubber material such as FKM, NBR, H-NBR, EPDM, CR, ACM, AEM, VMQ, and FVMQ, and is formed in an annular shape that can be fitted into the annular mounting groove 10. Has been. The gasket 3 includes a gasket main body 30 having an annular shape whose overall shape is along the mounting groove 10. As shown in FIGS. 1 to 4, the gasket body 30 has a cross-sectional shape that is vertically long along the height direction H corresponding to the depth direction F of the mounting groove 10, and has a transverse line L <b> 1 at the center in the height direction. It is formed line-symmetrically as a symmetry axis and line-symmetrically with a longitudinal line L2 at the center in the width direction orthogonal to the height direction H as a symmetry axis (see FIG. 4). The side surfaces 30a, 30a facing both side walls (inner walls) 10a, 10a of the mounting groove 10 of the gasket body 30 are parallel to the height direction H, and the upper and lower ends of the gasket body 30 in the height direction. The portions 30b and 30c are triangular in cross section. Further, the height of the gasket main body 30 is greater than the depth of the mounting groove 10, and as shown in FIG. 4, when the upper end portion 30b is fitted into the bottom wall 10b of the mounting groove 10 as shown in FIG. The portion including the lower end portion 30 c is formed so as to protrude downward from the opening portion 10 c of the mounting groove 10.
In the present specification, the terms “upper” and “lower” mean the upper side of each drawing along the height direction H, and the lower side means lower. Further, the shape of the upper and lower end portions 30b and 30c is not limited to a triangular cross section, and may be a flat shape, an arc shape, or other shapes.

前記ガスケット本体３０の両側面３０ａ，３０ａに、凸条体からなる縦リブ３１が高さ方向Ｈに沿い、且つ該ガスケット本体３０の周方向Ｓ（図２、図３参照）に沿って間隔を空けて複数設けられている。また、該両側面３０ａ，３０ａには、ガスケット本体３０の周方向Ｓに沿いその全周に亘って連なる凸条体からなる横リブ３２が各１条ずつ設けられている。そして、前記複数の縦リブ３１は、前記横リブ３２を挟んで前記高さ方向Ｈに相対する位置に、該横リブ３２と分離した状態、即ち、横リブ３２に交差はするが、連接しない状態で形成されている。これら縦リブ３１及び横リブ３２は、断面形状がいずれも山形の形状とされ、その頂部をとおり前記ガスケット本体３０の側面３０ａに垂直な線（垂直線）Ｌ３，Ｌ４（図４、図５参照）を対称軸として線対称に形成されている。また、これら縦リブ３１及び横リブ３２は、前記ガスケット本体３０の両側面３０ａ，３０ａに、前記縦断線Ｌ２を対称軸として線対称に形成されている。横リブ３２は、前記両側面３０ａ，３０ａの高さ方向Ｈの中央において、前記横断線Ｌ１と垂直線Ｌ３とが一致するように形成され、複数の縦リブ３１は、両側面３０ａ，３０ａに、ガスケット本体３０の周方向（長手方向）に沿った中心線Ｌ５（図３参照）の左右に対称関係で形成されている。そして、本実施形態に係る横リブ３２の前記側面３０ａからの突出高さＡと、縦リブ３１の前記側面３０ａからの突出高さＢとは同じとされている（図４参照）。 Vertical ribs 31 made of ridges are formed along the height direction H on both side surfaces 30a, 30a of the gasket body 30 and spaced along the circumferential direction S of the gasket body 30 (see FIGS. 2 and 3). A plurality of them are provided. Further, each of the side surfaces 30a, 30a is provided with one horizontal rib 32 made of a convex strip extending along the circumferential direction S of the gasket main body 30 over the entire circumference thereof. The plurality of vertical ribs 31 are separated from the horizontal ribs 32 at positions opposed to the height direction H across the horizontal ribs 32, that is, intersect the horizontal ribs 32 but are not connected. It is formed in a state. The vertical ribs 31 and the horizontal ribs 32 each have a mountain shape in cross section, and lines (vertical lines) L3 and L4 (see FIG. 4 and FIG. 5) perpendicular to the side surface 30a of the gasket body 30 passing through the tops thereof. ) About the axis of symmetry. The vertical ribs 31 and the horizontal ribs 32 are formed symmetrically on both side surfaces 30a and 30a of the gasket body 30 with the vertical line L2 as an axis of symmetry. The transverse rib 32 is formed so that the transverse line L1 and the vertical line L3 coincide with each other at the center in the height direction H of the both side faces 30a, 30a, and the plurality of longitudinal ribs 31 are formed on the both side faces 30a, 30a. The center line L5 (see FIG. 3) along the circumferential direction (longitudinal direction) of the gasket body 30 is formed symmetrically on the left and right. And the protrusion height A from the said side 30a of the horizontal rib 32 which concerns on this embodiment, and the protrusion height B from the said side 30a of the vertical rib 31 are made the same (refer FIG. 4).

次に、インテークマニホールド１及びシリンダヘッド２の各対向面１ａ，２ａ間に前記ガスケット３を介在させて、当該２部材１，２間をシールする密封構造を構成する要領を説明する。先ず、図４に示すように、前記のように構成されたガスケット３が、前記取付溝１０に嵌め入れられて装着される。この時、ガスケット３の断面形状は、前記のように実質的に上下及び左右に対称に形成されているから、ガスケット３を嵌め入れる向きが限定されず、前記上端部３０ｂ及び下端部３０ｃのいずれからも取付溝１０に嵌め入れることが可能で、装着間違いが生じる懸念がない。取付溝１０にガスケット３が装着された状態で、対向面１ａ，２ａが互いに対向関係となるよう配置され、図１に示すように、インテークマニホールド１及びシリンダヘッド２がボルト４によって締結される。この締結は、取付溝１０の深さ方向Ｆ、即ち、ガスケット３の高さ方向Ｈに沿ってなされ、締結に伴い、ガスケット３は、取付溝１０の底壁（内壁）１０ｂ及びシリンダヘッド２の前記対向面２ａ間で、高さ方向Ｈに沿って圧縮される。ガスケット３が高さ方向Ｈに沿って圧縮されると、ガスケット本体３０の上下端部３０ｂ、３０ｃが図１に示すように圧縮弾性変形して、前記底壁１０ｂ及び対向面２ａに弾接するとともに、ガスケット本体３０は、高さ方向Ｈに直交する方向（幅方向）に膨大するように弾性変形する。 Next, the point which comprises the sealing structure which seals between the said 2 members 1 and 2 by interposing the said gasket 3 between each opposing surface 1a, 2a of the intake manifold 1 and the cylinder head 2 is demonstrated. First, as shown in FIG. 4, the gasket 3 configured as described above is fitted into the mounting groove 10 and attached. At this time, since the cross-sectional shape of the gasket 3 is substantially symmetrical in the vertical and horizontal directions as described above, the direction in which the gasket 3 is fitted is not limited, and any of the upper end 30b and the lower end 30c is not limited. Can be fitted into the mounting groove 10, and there is no fear of erroneous mounting. With the gasket 3 mounted in the mounting groove 10, the opposing surfaces 1 a and 2 a are arranged so as to face each other, and the intake manifold 1 and the cylinder head 2 are fastened by bolts 4 as shown in FIG. 1. This fastening is performed along the depth direction F of the mounting groove 10, that is, along the height direction H of the gasket 3. With the fastening, the gasket 3 is attached to the bottom wall (inner wall) 10 b of the mounting groove 10 and the cylinder head 2. Compressed along the height direction H between the opposing surfaces 2a. When the gasket 3 is compressed along the height direction H, the upper and lower end portions 30b and 30c of the gasket body 30 are compressed and elastically deformed as shown in FIG. 1, and elastically contact the bottom wall 10b and the opposing surface 2a. The gasket body 30 is elastically deformed so as to be enormous in a direction (width direction) orthogonal to the height direction H.

この圧縮過程で、ガスケット３は、左右いずれかに倒れようとするが、ガスケット本体３０の前記両側面３０ａ，３０ａには、前記複数の縦リブ３１が前記のように設けられているから、これら縦リブ３１のいずれかが側面３０ａに当接し、それ以上の倒れが防止される。しかも、両側面３０ａ，３０ａにおける縦リブ３１は、前記中心線Ｌ５の左右に対称関係（図３参照）で形成されているから、両側の縦リブ３１，３１の前記側壁１０ａ，１０ａとの規制作用によって、左右への倒れが効果的に防止される。また、両側面３０ａ，３０ａの高さ方向Ｈの中央部には、前記のように横リブ３２，３２が設けられているから、ガスケット本体３０の周方向に隣接する縦リブ３１間においては、横リブ３２が前記側壁１０ａに当接し、この部分での倒れも防止される。特に、横リブ３２は、圧縮に伴う幅方向への膨みが顕著な前記中央部に形成されているから、前記側壁１０ａに対して当接し易く、隣接する縦リブ３１，３１間での倒れ防止がより的確になされる。そして、ガスケット３は、取付溝１０内で左右に蛇行するような場合があるが、横リブ３２が側壁１０ａに当接することにより、このような蛇行が防止される。しかも、本実施形態では、横リブ３２及び縦リブ３１の前記側面３０ａからの突出高さが同じとされているから、縦リブ３１が隣接する縦リブ３１間における蛇行防止機能の障害となることがない。 In this compression process, the gasket 3 tends to fall to either the left or right side, but the side walls 30a, 30a of the gasket body 30 are provided with the plurality of vertical ribs 31 as described above. Any one of the vertical ribs 31 comes into contact with the side surface 30a, and further collapse is prevented. Moreover, since the vertical ribs 31 on both side surfaces 30a and 30a are formed in a symmetrical relationship (see FIG. 3) on the left and right of the center line L5, the vertical ribs 31 and 31 on both sides are restricted from the side walls 10a and 10a. By the action, the falling to the left and right is effectively prevented. Moreover, since the horizontal ribs 32 and 32 are provided in the center part of the height direction H of both side surfaces 30a and 30a as mentioned above, between the longitudinal ribs 31 adjacent to the circumferential direction of the gasket main body 30, The lateral rib 32 abuts against the side wall 10a, and the fall at this portion is also prevented. In particular, since the lateral rib 32 is formed in the central portion where the expansion in the width direction accompanying compression is remarkable, the lateral rib 32 is easily brought into contact with the side wall 10a and falls between the adjacent longitudinal ribs 31 and 31. Prevention is more accurate. The gasket 3 may meander from side to side in the mounting groove 10, but such meandering is prevented by the lateral rib 32 coming into contact with the side wall 10 a. In addition, in the present embodiment, since the protruding heights of the horizontal ribs 32 and the vertical ribs 31 from the side surface 30a are the same, the vertical ribs 31 become an obstacle to the meandering prevention function between the adjacent vertical ribs 31. There is no.

前記ボルト４による締結は、図１に示すように、前記対向面１ａ，２ａが互いに対向関係で当接して合体するようになされる。従って、ガスケット３は、その周方向Ｓの全周に亘り、圧縮圧のむらがなく均等に圧縮されることになる。そして、このように締結が完了した状態では、図１に示すように、ガスケット３は、高さ方向Ｈ（上下方向）に圧縮されるとともに、幅方向（高さ方向Ｈに直交する方向）に膨む。これによって、ガスケット本体３０の上下端部３０ｂ，３０ｃが、取付溝１０の前記底壁１０ｂ及びシリンダブロック２の対向面２ａに弾性変形を伴い弾接し、且つ、縦リブ３１及び横リブ３２も弾性変形を伴い取付溝１０の側壁１０ａに弾接する。上下端部３０ｂ，３０ｃの前記底壁１０ｂ及び対向面２ａに対する弾接によって、インテークマニホールド１及びシリンダヘッド２の対向面１ａ，２ａ間が密封され、両者のシール対象空所１ｂ，２ｂ間を流通するシール対象媒体の外部への漏出が防止される。また、横リブ３２は、ガスケット本体３０の全周に亘り形成され、前記側面１０ａに弾接状態で接触しているから、この部分からシール対象媒体が、取付溝１０の底壁１０ｂ側内部へ浸入することが防止され、底壁１０ｂ側内部に滞留することがない。従って、ガスケット３の底壁１０ｂ側に位置する部分が、浸入したシール対象媒体に晒されて劣化することがなく、この部分のシール性が経時的に低下することもない。特に、本実施形態では、横リブ３２及び縦リブ３１の前記側面３０ａからの突出高さＡ，Ｂが同じとされているから、横リブ３２を側面１０ａに十分に接触させることができる。また、横リブ３２は縦リブ３１と分離した状態とされているから、縦リブ３１の影響を受けずに、前記側面１０ａに均一に密着した状態で接触し、この側面補助シール機能により前記シール対象媒体の底壁１０ｂ側内部への浸入防止機能が的確に発揮される。 As shown in FIG. 1, the fastening by the bolt 4 is performed so that the facing surfaces 1a and 2a come into contact with each other in a facing relationship. Therefore, the gasket 3 is uniformly compressed over the entire circumference in the circumferential direction S without unevenness of the compression pressure. When the fastening is completed in this way, the gasket 3 is compressed in the height direction H (up and down direction) and also in the width direction (direction perpendicular to the height direction H) as shown in FIG. Swell. Thus, the upper and lower end portions 30b, 30c of the gasket body 30 are elastically contacted with the bottom wall 10b of the mounting groove 10 and the opposing surface 2a of the cylinder block 2 with elastic deformation, and the vertical ribs 31 and the horizontal ribs 32 are also elastic. With deformation, it elastically contacts the side wall 10a of the mounting groove 10. By elastic contact of the upper and lower end portions 30b and 30c with the bottom wall 10b and the opposing surface 2a, the opposing surfaces 1a and 2a of the intake manifold 1 and the cylinder head 2 are sealed, and the space between the sealing target cavities 1b and 2b is circulated. Leakage of the medium to be sealed to the outside is prevented. Further, since the lateral rib 32 is formed over the entire circumference of the gasket body 30 and is in contact with the side surface 10a in an elastic contact state, the medium to be sealed enters from the portion into the bottom wall 10b side of the mounting groove 10. It is prevented from entering and does not stay inside the bottom wall 10b. Therefore, the portion located on the bottom wall 10b side of the gasket 3 is not deteriorated by being exposed to the infiltrated medium to be sealed, and the sealing performance of this portion does not deteriorate with time. In particular, in this embodiment, since the protruding heights A and B from the side surface 30a of the horizontal rib 32 and the vertical rib 31 are the same, the horizontal rib 32 can be sufficiently brought into contact with the side surface 10a. Further, since the horizontal ribs 32 are separated from the vertical ribs 31, they are in contact with the side surface 10a without being influenced by the vertical ribs 31 and are in close contact with the side surface 10a. The function of preventing the target medium from entering the inside of the bottom wall 10b is precisely exhibited.

インテークマニホールド１を含む内燃機関は高温の環境下で使用されるため、図例のようにインテークマニホールド１が合成樹脂の成型体からなる場合、熱変形（熱膨張）を起こし易い。この熱変形に伴うインテークマニホールド１及びシリンダヘッド２の熱膨張差によって、ボルト４による締結部間のインテークマニホールド１が浮き上がり、対向面１ａ，２ａの間隔が拡がろうとする。ガスケット３と取付溝１０の側壁１０ａとの弾接は、複数の縦リブ３１及び両側壁１０ａに各１条の横リブ３２の弾性変形によってなされるから、実質的な弾接面積が小さく、従って、前記圧縮の際に、ガスケット３の取付溝１０の側壁１０ａ方向への変形により生じる応力が小さくなる。さらに、この取付溝１０の側壁１０ａ方向への変形は、取付溝１０の側壁１０ａにより抑制されるため、これによって生じる圧縮方向（締結方向）への変形による圧縮方向のシール反力の増加を抑えることができ、シール反力を適切な状態に維持することができる。また、ガスケット３が取付溝１０の側壁１０ａを押す力が小さくなるため、両リブ３１，３２が側壁１０ａに貼り付きにくいものとすることができる。即ち、ガスケット３の圧縮による深さ方向Ｆに沿った復元弾力に対する側壁１０ａによる規制は少なく、該復元弾力は対向面１ａ，２ａの間隔の拡がりに伴い下端部３０ｃに作用し、下端部３０ｃを対向面２ａ側に膨出するよう弾性変形させる。従って、対向面１ａ，２ａ間にその間隔が拡がるような変動が生じても、ガスケット３がその復元弾力によってこの変動に追従し、下端部３０ｃの対向面２ａに対する弾接状態が維持され、インテークマニホールド１が熱変形しても、シリンダヘッド２とのシール性が低下せず、優れたシール性が維持される。 Since the internal combustion engine including the intake manifold 1 is used in a high-temperature environment, when the intake manifold 1 is made of a synthetic resin molding as shown in the figure, thermal deformation (thermal expansion) is likely to occur. Due to the difference in thermal expansion between the intake manifold 1 and the cylinder head 2 due to this thermal deformation, the intake manifold 1 between the fastening portions by the bolts 4 rises, and the interval between the opposing surfaces 1a and 2a tends to increase. Since the elastic contact between the gasket 3 and the side wall 10a of the mounting groove 10 is made by elastic deformation of each of the plurality of vertical ribs 31 and both side walls 10a, each of the horizontal ribs 32, the substantial elastic contact area is small. During the compression, the stress generated by the deformation of the mounting groove 10 of the gasket 3 in the direction of the side wall 10a is reduced. Further, since the deformation of the mounting groove 10 in the direction of the side wall 10a is suppressed by the side wall 10a of the mounting groove 10, an increase in the seal reaction force in the compression direction due to the deformation in the compression direction (fastening direction) caused thereby is suppressed. And the seal reaction force can be maintained in an appropriate state. Moreover, since the force with which the gasket 3 pushes the side wall 10a of the mounting groove 10 becomes small, both the ribs 31 and 32 can be made difficult to stick to the side wall 10a. That is, there are few restrictions by the side wall 10a with respect to the restoring elastic force along the depth direction F by compression of the gasket 3, and this restoring elastic force acts on the lower end part 30c with the expansion of the space | interval of the opposing surfaces 1a and 2a. It is elastically deformed so as to bulge toward the facing surface 2a. Therefore, even if a fluctuation that increases the distance between the opposing surfaces 1a and 2a occurs, the gasket 3 follows this fluctuation by its restoring elasticity, and the elastic contact state of the lower end 30c with respect to the opposing surface 2a is maintained. Even if the manifold 1 is thermally deformed, the sealing performance with the cylinder head 2 is not deteriorated, and the excellent sealing performance is maintained.

また、縦リブ３１及び横リブ３２は、いずれも断面形状が山形とされ、且つ、前記垂直線Ｌ３，Ｌ４を対称軸として線対称に形成されているから、前記締結時におけるこれらリブ３１，３２の圧縮弾性変形が均一になされ、前記のシール対象媒体の浸入阻止機能や、蛇行防止機能、倒れ防止機能、さらには前記変動に伴う追従性等が適正に発揮される。
図１に示すようなインテークマニホールド１の取付溝１０に対するガスケット３の嵌め入れ装着は、取付溝１０の開口部１０ｃを上向きにした状態でなされる。その後インテークマニホールド１を天地反転もしくは回転して、インテークマニホールド１の対向面１ａ及び取付溝１０の開口部１０ｃが、シリンダヘッド２の対向面２ａに対向するように配置される。この時、例示のガスケット３は、取付溝１０に遊びを持たせた状態で嵌め入れられているだけであるから、ガスケット３に手を添えていないと脱落する懸念がある。そこで、図示は省略するが、縦リブ３１、或いは、横リブ３２等に、前記嵌め入れの際に取付溝１０の側壁１０ａに弾接する脱落防止突起を適宜設けても良い。このような脱落防止突起は、次に説明する図６の例においても同様に採用可能である。 Further, since the vertical rib 31 and the horizontal rib 32 are both mountain-shaped in cross section and formed symmetrically about the vertical lines L3 and L4, the ribs 31 and 32 at the time of fastening are formed. Thus, the function of preventing the intrusion of the medium to be sealed, the function of preventing meandering, the function of preventing the collapse, and the followability associated with the variation are properly exhibited.
The gasket 3 is fitted into the mounting groove 10 of the intake manifold 1 as shown in FIG. 1 with the opening 10c of the mounting groove 10 facing upward. Thereafter, the intake manifold 1 is turned upside down or rotated so that the opposed surface 1a of the intake manifold 1 and the opening 10c of the mounting groove 10 are arranged to face the opposed surface 2a of the cylinder head 2. At this time, since the illustrated gasket 3 is merely fitted in a state in which the mounting groove 10 has a play, there is a concern that the gasket 3 may fall off if the hand is not attached to the gasket 3. Therefore, although not shown in the drawings, the vertical rib 31 or the horizontal rib 32 may be appropriately provided with a drop-off preventing projection that elastically contacts the side wall 10a of the mounting groove 10 during the fitting. Such a drop-off preventing projection can be similarly employed in the example of FIG. 6 described below.

図６は、本発明に係るガスケットの他の実施形態を示している。この実施形態のガスケット３では、横リブ３２の前記側面３０ａからの突出高さＡが、縦リブ３１の側面３０ａからの突出高さＢより小とされている。ガスケット３のその他の構成は、図１〜図５に示す例と同様である。この実施形態のガスケット３においては、横リブ３２の前記突出高さＡが、縦リブ３１の前記突出高さＢより小とされていることにより、前記締結過程で横リブ３２と側壁１０ａとが過剰に接触せず、圧縮方向への過剰な反力が生じない。これによって、横リブ３２が取付溝１０の側壁１０ａ面に貼り付きにくいものとすることができ、インテークマニホールド１及びシリンダヘッド２の熱変形差による前記変動に対する追従性が維持され、前記変動があっても、インテークマニホールド１及びシリンダヘッド２間のシール性の低下がより生じ難くなる。また、締結後の取付溝１０の底壁１０ｂ側内部へのシール対象媒体の浸入も防止される。この場合、前記突出高さＡと突出高さＢとの差Ｃが大き過ぎると、横リブ３２の頂部と、取付溝１０の側壁１０ａとの距離が大きくなるため、ガスケット3の嵌め入れ装着時における横リブ３２による蛇行防止効果、或いは、側面補助シール効果が充分に発揮され難くなる。突出高さＡと突出高さＢとの差Ｃの適正値について、種々検証を試みた結果、ガスケット本体３０の両側面３０ａ，３０ａに形成された横リブ３２，３２の頂点を結ぶ線分の長さ２Ａ＋Ｄ（Ｄは、ガスケット本体３０の幅方向寸法）の１５％以下が望ましいことが実証されている。即ち、Ｃ≦０．１５（２Ａ＋Ｄ）、縦リブ３１，３１の頂点を結ぶ線分の長さ２Ｂ＋Ｄ≦１．３（２Ａ＋Ｄ）であることが望ましい。 FIG. 6 shows another embodiment of the gasket according to the present invention. In the gasket 3 of this embodiment, the protruding height A of the lateral rib 32 from the side surface 30a is smaller than the protruding height B of the vertical rib 31 from the side surface 30a. The other structure of the gasket 3 is the same as that of the example shown in FIGS. In the gasket 3 of this embodiment, since the protruding height A of the horizontal rib 32 is smaller than the protruding height B of the vertical rib 31, the horizontal rib 32 and the side wall 10 a are connected in the fastening process. There is no excessive contact and no excessive reaction force in the compression direction occurs. As a result, the lateral ribs 32 can be made difficult to stick to the surface of the side wall 10a of the mounting groove 10, the followability to the fluctuation due to the thermal deformation difference between the intake manifold 1 and the cylinder head 2 is maintained, and the fluctuation occurs. However, the sealing performance between the intake manifold 1 and the cylinder head 2 is less likely to occur. Further, the medium to be sealed can be prevented from entering the bottom wall 10b side of the mounting groove 10 after fastening. In this case, if the difference C between the protruding height A and the protruding height B is too large, the distance between the top of the lateral rib 32 and the side wall 10a of the mounting groove 10 increases. In this case, the effect of preventing meandering by the lateral ribs 32 or the side surface auxiliary sealing effect is not sufficiently exhibited. As a result of various verifications regarding the appropriate value of the difference C between the protrusion height A and the protrusion height B, a line segment connecting the vertices of the lateral ribs 32 and 32 formed on both side surfaces 30a and 30a of the gasket body 30 is obtained. It has been demonstrated that 15% or less of the length 2A + D (D is the width-direction dimension of the gasket body 30) is desirable. That is, it is desirable that C ≦ 0.15 (2A + D) and the length of the line segment connecting the vertices of the longitudinal ribs 31 and 31 are 2B + D ≦ 1.3 (2A + D).

なお、前記実施形態では、第１部材及び第２部材がインテークマニホールド及びシリンダヘッドである例について述べたが、本発明のガスケットが適用される密封構造は、これに限定されず、ヘッドカバー及びシリンダヘッド間の密封構造や、その他の２部材間の密封構造にも適用される。また、第１部材であるインテークマニホールドが合成樹脂の成型体からなる場合を例示したが、第１部材及び第２部材がともに金属製、或いは合成樹脂製であっても良い。さらに、横リブ３２の形成位置は、例示のように、側面３０ａの高さ方向Ｈの中央部であることが望ましいが、中央よりやや下方位置であっても良い。加えて、図例の取付溝１０、ガスケット本体３０、縦リブ３１及び横リブ３２の断面形状は、模式的に示したものであるから、実際には設計上の適正な形状とされることは言うまでもない。ガスケット３の断面形状は、実施形態のように上下及び左右が対称である形状が望ましいが、これに限定されず、下部に左右に膨出した鍔部を有した形状であっても良い。この形状の場合、第１部材及び第２部材の締結状態では、それぞれの対向面１ａ，２ａが当接した合体状態とならず、鍔部が両対向面１ａ，２ａ間に挟圧され、対向面１ａ，２ａ間に隙間が生じることになる。 In the above embodiment, the example in which the first member and the second member are the intake manifold and the cylinder head has been described. However, the sealing structure to which the gasket of the present invention is applied is not limited to this, and the head cover and the cylinder head The present invention is also applied to a sealing structure between the two and other two members. Moreover, although the case where the intake manifold which is the first member is formed of a synthetic resin molded body is illustrated, both the first member and the second member may be made of metal or synthetic resin. Further, as illustrated, the formation position of the lateral rib 32 is desirably the central portion in the height direction H of the side surface 30a, but may be slightly lower than the center. In addition, since the mounting grooves 10, the gasket main body 30, the vertical ribs 31 and the horizontal ribs 32 in the illustrated example are schematically shown in cross section, it is actually assumed that the design is appropriate. Needless to say. The cross-sectional shape of the gasket 3 is preferably a shape that is vertically and horizontally symmetrical as in the embodiment, but is not limited to this, and may be a shape having a flange that bulges left and right at the bottom. In the case of this shape, in the fastening state of the first member and the second member, the opposed surfaces 1a and 2a are not brought into a combined state, and the flange portion is sandwiched between the opposed surfaces 1a and 2a to be opposed to each other. A gap is generated between the surfaces 1a and 2a.

１インテークマニホールド（第１部材）
１ａ対向面
１０取付溝
１０ａ側壁
１０ｂ底壁
２シリンダヘッド（第２部材）
２ａ対向面
３ガスケット
３０ガスケット本体
３０ａ側面
３１縦リブ
３２横リブ
４ボルト（締結部材）
Ａ横リブの突出高さ
Ｂ縦リブの突出高さ
Ｆ深さ方向
Ｈ高さ方向
Ｌ１高さ方向中央の横断線（対称軸）
Ｌ２幅方向中央の縦断線（対称軸）
Ｌ３横リブの対称軸（垂直線）
Ｌ４縦リブの対称軸（垂直線）
Ｓ周方向 1 Intake manifold (first member)
1a Opposing surface 10 Mounting groove 10a Side wall 10b Bottom wall 2 Cylinder head (second member)
2a Opposing surface 3 Gasket 30 Gasket body 30a Side surface 31 Vertical rib 32 Horizontal rib 4 Bolt (fastening member)
A Protrusion height of horizontal rib B Protrusion height of vertical rib F Depth direction H Height direction L1 Transverse line in the center of height direction (symmetric axis)
L2 Longitudinal line at the center of the width direction (axis of symmetry)
L3 Axis of symmetry of transverse rib (vertical line)
L4 Axis of symmetry of vertical rib (vertical line)
S Circumferential direction

Claims

The first member and the second member, which are fitted into an annular mounting groove formed on one of the opposing surfaces of the first member and the second member that are arranged to face each other and are fastened to face each other by a fastening member In the gasket that seals between
An annular gasket body shaped along the mounting groove;
Convex provided on the side surface of the gasket body facing the side wall of the mounting groove along the height direction corresponding to the depth direction of the mounting groove of the gasket body and with a gap in the circumferential direction of the gasket body. A plurality of longitudinal ribs composed of strips;
On the side surface, provided with a lateral rib made of a ridge provided continuously over the entire circumference of the gasket body,
The gasket, wherein the plurality of vertical ribs are formed in a state separated from the horizontal ribs at positions facing the height direction across the horizontal ribs.

The gasket according to claim 1,
The gasket characterized in that the protruding height of the horizontal rib from the side surface is equal to or lower than the protruding height of the vertical rib from the side surface.

The gasket according to claim 1 or 2,
The gasket according to claim 1, wherein the lateral rib is provided at a central portion in the height direction of the side surface.

The gasket according to any one of claims 1 to 3,
The cross-sectional shape of the gasket body is formed symmetrically with respect to the transverse line at the center in the height direction as a symmetry axis, and symmetrical with respect to the longitudinal line at the center in the width direction perpendicular to the height direction as the symmetry axis, The gasket, wherein the vertical rib and the horizontal rib are formed symmetrically on the side surfaces of both side portions of the gasket body with the vertical line as the axis of symmetry.

The gasket according to any one of claims 1 to 4,
The cross-sectional shapes of the horizontal rib and the vertical rib are both chevron-shaped, and are formed in line symmetry with a line passing through the top and perpendicular to the side surface of the gasket body as a symmetry axis. .