JP6998582B2

JP6998582B2 - gasket

Info

Publication number: JP6998582B2
Application number: JP2017185260A
Authority: JP
Inventors: 大森; 友樹川端
Original assignee: Uchiyama Manufacturing Corp
Current assignee: Uchiyama Manufacturing Corp
Priority date: 2017-09-26
Filing date: 2017-09-26
Publication date: 2022-01-18
Anticipated expiration: 2037-09-26
Also published as: JP2019060405A

Description

本発明は、２つの部材の間を密封するガスケットに関する。例えば、低温環境で使用される配管の継ぎ手部、或いは、内燃機関のシリンダヘッドとヘッドカバーとの間に用いられるガスケットに関する。 The present invention relates to a gasket that seals between two members. For example, it relates to a joint portion of a pipe used in a low temperature environment, or a gasket used between a cylinder head and a head cover of an internal combustion engine.

前記のようなガスケットは、一方の部材に形成された環状の取付溝に嵌め入れられ、締結部材による締結によって、一方の部材と対向して配置される他方の部材との間を密封する。特許文献１～特許文献３には、自動車用内燃機関のシリンダヘッドとヘッドカバー（シリンダヘッドカバー、ロッカーカバー）との間に圧縮された状態で介在されるガスケットが記載されている。 The gasket as described above is fitted into an annular mounting groove formed in one member, and is sealed between one member and the other member arranged opposite to each other by fastening with the fastening member. Patent Documents 1 to 3 describe a gasket interposed between a cylinder head of an internal combustion engine for an automobile and a head cover (cylinder head cover, rocker cover) in a compressed state.

特許文献１，２には、いずれも２種類のゴム材からなるガスケットが開示されている。特許文献１には、二層構造のガスケットが記載されており、硬質のゴム又はゴム状弾性体からなる第一の層と、より軟質のゴム又はゴム状弾性体よりなる第二の層とを備えている。また特許文献１には、ヘッドカバーに形成された嵌入溝（取付溝）に第一の層を嵌め入れ、ヘッドカバーをシリンダヘッドにボルトによって締結させ、ヘッドカバーとシリンダヘッドとの間に当該ガスケットを圧縮状態で介在させることが記載されている。このように、第一の層は比較的硬いので、前記嵌入溝への嵌着が容易になされて、組付け作業性が良く、また、第二の層は比較的軟らかいため、面圧の大小分布に拘わらずガスケットの全周に亘って良好な密封性が得られる、とされている。 Patent Documents 1 and 2 disclose gaskets made of two types of rubber materials. Patent Document 1 describes a gasket having a two-layer structure, and includes a first layer made of a hard rubber or a rubber-like elastic body and a second layer made of a softer rubber or a rubber-like elastic body. I have. Further, in Patent Document 1, the first layer is fitted into the fitting groove (mounting groove) formed in the head cover, the head cover is fastened to the cylinder head with bolts, and the gasket is compressed between the head cover and the cylinder head. It is described that it intervenes in. As described above, since the first layer is relatively hard, it can be easily fitted into the fitting groove and the assembly workability is good, and since the second layer is relatively soft, the surface pressure is large or small. It is said that good sealing performance can be obtained over the entire circumference of the gasket regardless of the distribution.

特許文献２には、ガスケットの本体をシリコン系ゴム材で形成し、本体の外周面にアクリル系ゴム材（フッ素系ゴム材）で形成した外周部材を被着することが記載されている。このように、本体の外周がアクリル系ゴム材の外周部材で被われているため、直接潤滑油等の油や高熱に晒されても劣化等が防止される、とされている。また本体がシリコン系ゴム材であるため、圧縮によるへたり等が防止される、とされている。 Patent Document 2 describes that the main body of the gasket is formed of a silicon-based rubber material, and an outer peripheral member formed of an acrylic rubber material (fluorine-based rubber material) is adhered to the outer peripheral surface of the main body. As described above, since the outer periphery of the main body is covered with the outer peripheral member of the acrylic rubber material, it is said that deterioration or the like is prevented even if it is directly exposed to oil such as lubricating oil or high heat. In addition, since the main body is made of silicon-based rubber, it is said that sagging due to compression is prevented.

また、特許文献３には、取付溝の溝側面側に突出する側面突起が設けられたガスケットが記載されている。この側面突起は、組付け時におけるガスケットの倒れやねじれが防止でき、これにより、ガスケットの取付溝からのはみ出しも無くなる、とされている。 Further, Patent Document 3 describes a gasket provided with a side projection protruding on the groove side surface side of the mounting groove. It is said that the side protrusions can prevent the gasket from falling or twisting during assembly, and thereby prevent the gasket from protruding from the mounting groove.

実開昭５９－１７０６５６号公報Jitsukaisho 59-170656 特開平０４－１２５３６２号公報Japanese Unexamined Patent Publication No. 04-125362 特開２００６－２９３６４号公報Japanese Unexamined Patent Publication No. 2006-29364

ところで、前記のようなガスケットは、高いシール機能が求められるに留まらず、以下の要請がある。２つの部材の間を密封するガスケットがシールする媒体（以下、シール対象媒体と言う）としては、水、薬品、各種オイル、高温又は低温ガス（液体）等がある。そのため、それぞれのシール対象媒体に対して、耐性（以下、耐媒体性と言う）のある材料によってガスケットが構成される。しかし、ガスケット全体をこのような材料で構成すると、過剰品質となり、これによってコストが高くなることがある。具体的には、例えば、シール対象媒体が特殊な燃料の場合、ガスケット全体を特殊な燃料に対する耐性に優れた材料で構成すると、媒体が接触する側には有効である。しかし、媒体が接触しない側では、このような特性を有する材料とするメリットはなく、過剰品質となり、経済性が考慮されているとはいえない。 By the way, the gasket as described above is not only required to have a high sealing function, but also has the following requirements. Examples of the medium (hereinafter referred to as a sealing target medium) sealed by the gasket that seals between the two members include water, chemicals, various oils, high-temperature or low-temperature gas (liquid), and the like. Therefore, the gasket is made of a material having resistance (hereinafter referred to as medium resistance) to each sealing target medium. However, if the entire gasket is made of such a material, it will result in excess quality, which can be costly. Specifically, for example, when the medium to be sealed is a special fuel, if the entire gasket is made of a material having excellent resistance to the special fuel, it is effective on the side where the medium comes into contact. However, on the side where the medium does not come into contact, there is no merit of using a material having such characteristics, the quality becomes excessive, and it cannot be said that economic efficiency is taken into consideration.

特許文献１に開示されたガスケットは、上述のように特性の異なる２種のゴム又はゴム状弾性体による二層構造とするものであるが、締付けボルト付近と、ボルト間部分とで面圧が異なることによる密封性の不均一を是正するために、このような二層構造とするものである。よって、上記特許文献１には、耐媒体性を高めるために二層構造とする技術思想はうかがえない。特許文献２に開示されたガスケットは、本体と外周部材とを異なる２種の材料とすることで、耐媒体性を高め、良好なシール性能を長期に亘り維持するものと解される。しかし、上記特許文献２に開示されたガスケットには、特許文献３に開示されている側面突起のような構造的な特性を持たせるという技術思想はうかがえない。特許文献３に開示されたガスケットは、側面突起を備え倒れやねじれが防止する構造的な特性を有しているが、耐媒体性や経済性を考慮した技術思想はうかがえない。 The gasket disclosed in Patent Document 1 has a two-layer structure made of two types of rubber or rubber-like elastic bodies having different characteristics as described above, but the surface pressure is high in the vicinity of the tightening bolt and in the portion between the bolts. In order to correct the non-uniformity of the sealing property due to the difference, such a two-layer structure is adopted. Therefore, the above-mentioned Patent Document 1 does not show the technical idea of having a two-layer structure in order to improve the medium resistance. It is understood that the gasket disclosed in Patent Document 2 enhances medium resistance and maintains good sealing performance for a long period of time by using two different materials for the main body and the outer peripheral member. However, the technical idea that the gasket disclosed in Patent Document 2 has structural characteristics such as the side protrusions disclosed in Patent Document 3 cannot be seen. The gasket disclosed in Patent Document 3 has a structural property of having side protrusions to prevent it from tipping over or twisting, but the technical idea in consideration of medium resistance and economic efficiency cannot be seen.

本発明は、上記実情に鑑みなされたもので、構造的な特性からシール機能を高めるとともに、耐媒体性を備え、経済性をも考慮し得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 circumstances, and an object of the present invention is to provide a novel gasket which has enhanced sealing function due to its structural characteristics, medium resistance, and economic efficiency.

本発明に係るガスケットは、対向して配置され締結部材によって互いに締結される２部材間からシール対象媒体が漏出しないように圧縮された状態で密封する環状のガスケットであって、前記２部材を構成する一方の部材に形成された環状の取付溝に嵌め入れて用いられ、弾性材料からなる第１の弾性部材と、前記第１の弾性部材とは異なる弾性材料からなる第２の弾性部材とが一体に接合されてなり、前記圧縮された状態で、前記取付溝の底面に接触する第１接触部と、前記２部材を構成する他方の部材に接触する第２接触部と、前記取付溝の一方の内壁面に接触する第３接触部と、前記取付溝の他方の内壁面に接触する第４接触部とを備え、前記第３接触部には、全周に亘り且つ前記一方の内壁面に弾接する方向に突出した環状の第１突条が設けられ、前記第４接触部には、全周に亘り且つ前記他方の内壁面に弾接する方向に突出した環状の第２突条が設けられており、前記第２の弾性部材は、前記第２接触部から隣接する前記第３接触部に至り前記第１突条を含む外周部分及び前記第２接触部から隣接する前記第４接触部に至り前記第２突条を含む外周部分を構成し、前記第１の弾性部材は、前記第２の弾性部材側に食込む嵌め合わせ構造とされ且つ前記第１接触部を含む前記第２の弾性部材を除く部分を構成することを特徴とする。 The gasket according to the present invention is an annular gasket that is arranged so as to face each other and is sealed in a compressed state so that the medium to be sealed does not leak from between the two members fastened to each other by the fastening members, and constitutes the two members. A first elastic member made of an elastic material and a second elastic member made of an elastic material different from the first elastic member are used by being fitted into an annular mounting groove formed in one of the members. A first contact portion that is integrally joined and in contact with the bottom surface of the mounting groove in the compressed state, a second contact portion that contacts the other member constituting the two members, and the mounting groove. A third contact portion that contacts one inner wall surface and a fourth contact portion that contacts the other inner wall surface of the mounting groove are provided, and the third contact portion covers the entire circumference and the one inner wall surface. An annular first ridge projecting in the direction of impact on the other is provided, and the fourth contact portion is provided with an annular second ridge protruding in the direction of impact on the other inner wall surface over the entire circumference. The second elastic member reaches the third contact portion adjacent to the second contact portion, and the outer peripheral portion including the first ridge and the fourth contact portion adjacent to the second contact portion. The first elastic member has a fitting structure that bites into the second elastic member side and includes the first contact portion. It is characterized by constituting a portion excluding an elastic member .

本発明のガスケットによれば、一方の部材と他方の部材とを締結して当該ガスケットが圧縮された状態（以下、圧縮状態と言う）で介在させると、第１接触部及び第２接触部がそれぞれ取付溝の底面及び他方の部材に接触するから、一方の部材と他方の部材との間が密封される。しかも、このガスケットの圧縮状態では、環状の第１突条及び第２突条をそれぞれ含む第３接触部及び第４接触部が、取付溝の一方の内壁面及び他方の内壁面にそれぞれ接触するから、各接触部の面圧が高くなり、シール性がより効果的に発揮される。特に、第１突条及び第２突条のうち、シール対象媒体側に位置する突条が取付溝のシール対象媒体側の内壁面に接触することにより、シール対象媒体が取付溝内へ浸入することが阻止され、シール性がより向上する。さらに、第１突条及び第２突条が設けられているから、一方の部材に設けられた取付溝に嵌め入れて装着する際に倒れや脱落が防止される。そして、第１接触部から隣接する第３接触部及び／又は第４接触部に至る外周部分、及び、第２接触部から隣接する第３接触部及び／又は第４接触部に至る外周部分を、それぞれ第１の弾性部材及び第２の弾性部材で構成しているから、第１の弾性部材及び第２の弾性部材の材料を適宜選択し、これらを組み合わせることによって、構造的な特性からシール機能を高めるとともに、耐媒体性を備え、経済性をも考慮した合理的なガスケットの設計を容易にすることができる。
また、第２の弾性部材が、第１突条及び第２突条を含んで他方の部材側に位置するから、第２の弾性部材を耐媒体性の優れた材料で構成した場合は、突条を含む構造的な特性からシール機能を高めるとともに、耐媒体性を備え、経済性をも考慮したより合理的なガスケットの設計を行うことができる。
また、第１の弾性部材と第２の弾性部材とが安定した結合状態に維持することができる。 According to the gasket of the present invention, when one member and the other member are fastened and the gasket is interposed in a compressed state (hereinafter referred to as a compressed state), the first contact portion and the second contact portion are formed. Since they come into contact with the bottom surface of the mounting groove and the other member, respectively, the space between one member and the other member is sealed. Moreover, in the compressed state of this gasket, the third contact portion and the fourth contact portion including the first and second annular protrusions come into contact with one inner wall surface and the other inner wall surface of the mounting groove, respectively. Therefore, the surface pressure of each contact portion becomes high, and the sealing property is more effectively exhibited. In particular, of the first and second ridges, the ridges located on the seal target medium side come into contact with the inner wall surface of the mounting groove on the seal target medium side, so that the seal target medium penetrates into the mounting groove. This is prevented and the sealing performance is further improved. Further, since the first ridge and the second ridge are provided, it is prevented from falling or falling off when it is fitted into the mounting groove provided in one of the members and mounted. Then, the outer peripheral portion from the first contact portion to the adjacent third contact portion and / or the fourth contact portion, and the outer peripheral portion from the second contact portion to the adjacent third contact portion and / or the fourth contact portion. Since each of the first elastic member and the second elastic member is composed of the first elastic member and the second elastic member, the materials of the first elastic member and the second elastic member are appropriately selected, and by combining these, the seal is formed from the structural characteristics. It is possible to enhance the function, provide medium resistance, and facilitate the design of rational gaskets in consideration of economy.
Further, since the second elastic member is located on the other member side including the first protrusion and the second protrusion, when the second elastic member is made of a material having excellent medium resistance, the protrusion is formed. It is possible to design a more rational gasket that has improved sealing function due to its structural properties including stripes, has medium resistance, and is economical.
Further, the first elastic member and the second elastic member can be maintained in a stable bonded state.

本発明のガスケットにおいて、前記第２の弾性部材は、前記シール対象媒体に対する耐性を有した材料からなるものとしても良い。 In the gasket of the present invention, the second elastic member may be made of a material having resistance to the sealing target medium .

本発明のガスケットにおいて、前記第１突条は、前記第３接触部の略中間部に設けられ、前記第２突条は、前記第４接触部の略中間部に設けられているものとしても良い。 In the gasket of the present invention, the first ridge is provided in a substantially intermediate portion of the third contact portion, and the second ridge is provided in a substantially intermediate portion of the fourth contact portion. good.

本発明のガスケットにおいて、前記第１接触部は、前記取付溝の前記底面側に突出する略二等辺三角形の山形形状であり、前記第２接触部は、前記他方の部材側に突出する略二等辺三角形の山形形状としても良い。 In the gasket of the present invention, the first contact portion has a chevron shape of a substantially isosceles triangle protruding toward the bottom surface side of the mounting groove, and the second contact portion has a substantially isosceles right triangle projecting toward the other member side. It may be a chevron shape of an isosceles triangle .

本発明のガスケットにおいて、前記第１の弾性部材と前記第２の弾性部材とが接合される接合部は、その断面形状が略二等辺三角形状を含む形状としても良い。 In the gasket of the present invention, the joint portion to which the first elastic member and the second elastic member are joined may have a cross-sectional shape including a substantially isosceles triangle shape .

また前記接合部は、その断面形状が凹凸部分を含む形状としても良い。 Further, the joint portion may have a cross-sectional shape including an uneven portion .

本発明のガスケットにおいて、前記一方の部材は自動車用エンジンのシリンダヘッドカバーであって、前記他方の部材はシリンダヘッドもしくはチェーンカバーとしても良い。 In the gasket of the present invention, the one member may be a cylinder head cover of an automobile engine, and the other member may be a cylinder head or a chain cover .

本発明のガスケットによれば、構造的な特性からシール機能を高めるとともに、耐媒体性を備え、経済性をも考慮し得る新規なガスケットとすることができる。 According to the gasket of the present invention, it is possible to obtain a novel gasket which has enhanced sealing function due to its structural characteristics, has medium resistance, and can be economically considered.

本発明に係るガスケットが適用される自動車用エンジンを示す部分破断正面図である。It is a partially broken front view which shows the automobile engine to which the gasket which concerns on this invention is applied. （ａ）（ｂ）は、本発明に係るガスケットの第一の実施形態であって、図１のＸ部に対応する部分の拡大図を示し、（ａ）はシリンダヘッドとヘッドカバーとが締結される前の状態を示し、（ｂ）はシリンダヘッドとヘッドカバーが締結された状態を示す。(A) and (b) are the first embodiment of the gasket according to the present invention, and the enlarged view of the part corresponding to the part X of FIG. The state before the cylinder head is shown, and (b) shows the state in which the cylinder head and the head cover are fastened. （ａ）（ｂ）は、第一の実施形態のガスケットの変形例を示す縦断面図である。(A) and (b) are vertical sectional views showing a modification of the gasket of the first embodiment. （ａ）は本発明に係るガスケットの第二の実施形態を、（ｂ）（ｃ）（ｄ）は第二の実施形態の変形例を、それぞれ示す縦断面図である。(A) is a vertical cross-sectional view showing a second embodiment of the gasket according to the present invention, and (b), (c) and (d) are modifications of the second embodiment. 本発明に係るガスケットの第三の実施形態を示す縦断面図である。It is a vertical sectional view which shows the 3rd Embodiment of the gasket which concerns on this invention. 本発明に係るガスケットの第四の実施形態を示す縦断面図である。It is a vertical sectional view which shows the 4th Embodiment of the gasket which concerns on this invention. （ａ）は本発明に係るガスケットの第五の実施形態を示す縦断面図、（ｂ）は第五の実施形態の変形例を示す縦断面図である。(A) is a vertical sectional view showing a fifth embodiment of the gasket according to the present invention, and (b) is a vertical sectional view showing a modified example of the fifth embodiment.

以下に本発明の実施の形態について、図面を参照して説明する。
＜第一の実施形態＞
図１及び図２（ａ）（ｂ）は、本実施形態に係るガスケットが適用される自動車用エンジンと当該ガスケットの第一の実施形態を示す。図例の自動車用エンジン１は、シリンダブロック２と、シリンダヘッド３と、オイルパン４と、チェーンカバー（フロントカバー）５と、ヘッドカバー（ロッカーカバー）６とより構成される。シリンダヘッド３は、シリンダブロック２の上面に締結され、オイルパン４は、シリンダブロック２の下面に締結される。また、チェーンカバー５は、縦方向に締結されたシリンダブロック２、シリンダヘッド３及びオイルパン４の前側部にこれらの締結方向と直交する方向よりこれらに跨るよう締結される。さらに、ヘッドカバー６は、シリンダヘッド３及びチェーンカバー５の上端面に両者に跨るよう締結される。
本明細書において、便宜上図１の紙面縦方向に沿った方向を上下方向、これに直交する方向を左右方向として説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First embodiment>
1 and 2 (a) and 2 (b) show an automobile engine to which the gasket according to the present embodiment is applied and a first embodiment of the gasket. The automobile engine 1 of the illustrated example is composed of a cylinder block 2, a cylinder head 3, an oil pan 4, a chain cover (front cover) 5, and a head cover (rocker cover) 6. The cylinder head 3 is fastened to the upper surface of the cylinder block 2, and the oil pan 4 is fastened to the lower surface of the cylinder block 2. Further, the chain cover 5 is fastened to the front side portions of the cylinder block 2, the cylinder head 3 and the oil pan 4 fastened in the vertical direction so as to straddle them from the direction orthogonal to the fastening direction. Further, the head cover 6 is fastened to the upper end surfaces of the cylinder head 3 and the chain cover 5 so as to straddle both of them.
In the present specification, for convenience, the direction along the vertical direction of the paper surface of FIG. 1 will be described as the vertical direction, and the direction orthogonal to the vertical direction will be described as the horizontal direction.

シリンダヘッド３の上端部は、平坦な被シール面３ａとされる。また、ヘッドカバー６は、下方に開口する箱形の形状をなし、この開口部には外向きのフランジ部６１が設けられている。ヘッドカバー６の開口部の周縁部からフランジ部６１に連なる下端面が被シール面６ａとされる。そして、フランジ部６１を介しボルト６２（締結部材）をシリンダヘッド３にねじ込むことにより、ヘッドカバー６がシリンダヘッド３に締結される。ヘッドカバー６の被シール面６ａであって、フランジ部６１の内側部分には、周方向に沿った環状の取付溝６３が形成されている。ガスケット１０は、ヘッドカバー６に形成された環状の取付溝６３に嵌め入れられる。 The upper end of the cylinder head 3 is a flat surface to be sealed 3a. Further, the head cover 6 has a box shape that opens downward, and an outward flange portion 61 is provided in this opening. The lower end surface extending from the peripheral edge of the opening of the head cover 6 to the flange portion 61 is defined as the sealed surface 6a. Then, the head cover 6 is fastened to the cylinder head 3 by screwing the bolt 62 (fastening member) into the cylinder head 3 via the flange portion 61. An annular mounting groove 63 along the circumferential direction is formed on the surface to be sealed 6a of the head cover 6 and the inner portion of the flange portion 61. The gasket 10 is fitted into the annular mounting groove 63 formed in the head cover 6.

本実施形態のガスケット１０は、第１の弾性部材１０１及び第２の弾性部材１０２からなる。第１の弾性部材１０１及び第２の弾性部材１０２は、図２（ａ）に示すように２つのＬ形が組み合わさり、接合部１００で一体に構成されている。ガスケット１０は、接合部１００を境とする上側部分が第１の弾性部材１０１で構成され、接合部１００を境とする下側部分が第２の弾性部材１０２で構成されている。 The gasket 10 of the present embodiment is composed of a first elastic member 101 and a second elastic member 102. As shown in FIG. 2A, the first elastic member 101 and the second elastic member 102 are formed by combining two L-shapes and integrally forming a joint portion 100. In the gasket 10, the upper portion with the joint portion 100 as the boundary is composed of the first elastic member 101, and the lower portion with the joint portion 100 as the boundary is composed of the second elastic member 102.

第１の弾性部材１０１及び第２の弾性部材１０２はいずれもゴム材からなり、いわゆる二色成型によって、第１の弾性部材１０１及び第２の弾性部材１０２が互いに接合一体とされたガスケット１０が得られる。この二色成型の際に、第１の弾性部材１０１用のゴム材が第２の弾性部材１０２用のゴム材に流入することを抑制するために、オフセット成型することも可能である。このような二色成型方法は、以下の実施形態のガスケットにも、それぞれの形状に応じたキャビティを有する上下金型を用いて同様に適用することができる。 The first elastic member 101 and the second elastic member 102 are both made of a rubber material, and the gasket 10 in which the first elastic member 101 and the second elastic member 102 are joined and integrated with each other by so-called two-color molding is formed. can get. During this two-color molding, offset molding is also possible in order to prevent the rubber material for the first elastic member 101 from flowing into the rubber material for the second elastic member 102. Such a two-color molding method can be similarly applied to the gaskets of the following embodiments by using upper and lower dies having cavities corresponding to the respective shapes.

第１の弾性部材１０１として用いられるゴム材としては、安価で且つ適度なゴム弾性を有する汎用性の高いＮＢＲ，ＡＣＭ，ＶＭＱが採用される。また、第２の弾性部材１０２として用いられるゴム材としては、耐薬品性や耐熱性に優れるＦＫＭ，耐低温性に優れるＦＶＭＱ，耐水性に優れるＥＰＤＭ等が採用される。シール対象媒体に接する側の第２の弾性部材１０２としては、シール対象媒体の性状に応じてこのようなゴム材が適宜選択採用される。例えば、本実施形態のようにシリンダヘッド３とヘッドカバー６との間に適用されるガスケットにおいては、耐薬品性や耐熱性に優れるＦＫＭが望ましく採用される。また、低温環境で使用される配管の継ぎ手部等に適用されるガスケットの場合は、耐低温性に優れるＦＶＭＱが望ましく採用される。さらには、水の流通配管の継ぎ手部等に適用されるガスケットの場合は、耐水性に優れるＥＰＤＭが望ましく採用される。 As the rubber material used as the first elastic member 101, NBR, ACM, and VMQ, which are inexpensive and have appropriate rubber elasticity and are highly versatile, are adopted. As the rubber material used as the second elastic member 102, FKM having excellent chemical resistance and heat resistance, FVMQ having excellent low temperature resistance, EPDM having excellent water resistance, and the like are adopted. As the second elastic member 102 on the side in contact with the material to be sealed, such a rubber material is appropriately selected and adopted according to the properties of the medium to be sealed. For example, in a gasket applied between the cylinder head 3 and the head cover 6 as in the present embodiment, FKM having excellent chemical resistance and heat resistance is preferably adopted. Further, in the case of a gasket applied to a joint portion of a pipe used in a low temperature environment, FVMQ having excellent low temperature resistance is preferably adopted. Further, in the case of a gasket applied to a joint portion of a water flow pipe or the like, EPDM having excellent water resistance is preferably adopted.

ガスケット１０は、ヘッドカバー（一方の部材）６に形成された環状の取付溝６３に嵌め入れられ、ヘッドカバー６と、シリンダヘッド（他方の部材）３との間に圧縮状態で介在され、ヘッドカバー６とシリンダヘッド３との間を密封する。取付溝６３は、底面６３ａと、シリンダヘッド３の外部側に位置する内壁面（一方の内壁面、以下外側内壁面と言う）６３ｂと、シリンダヘッド３の内部側に位置する内壁面（他方の内壁面、以下内側内壁面と言う）６３ｃとを備えている。ガスケット１０は、圧縮状態で取付溝６３の底面６３ａに接触する環状の第１接触部１１と、シリンダヘッド３の被シール面３ａに接触する環状の第２接触部１２とを備える。第１接触部１１及び第２接触部１２は、図２（ａ）に示すように断面形状が略二等辺三角形の山形形状とされている。第１接触部１１及び第２接触部１２は、図２（ｂ）に示すようにガスケット１０が圧縮された状態で取付溝６３の底面６３ａ及びシリンダヘッド３の被シール面３ａに、所定の（設計上の）幅で接触する部分を意味する。 The gasket 10 is fitted into an annular mounting groove 63 formed in the head cover (one member) 6 and is interposed between the head cover 6 and the cylinder head (the other member) 3 in a compressed state, and the head cover 6 and the gasket 10. Seal between the cylinder head 3 and the cylinder head 3. The mounting groove 63 includes a bottom surface 63a, an inner wall surface (one inner wall surface, hereinafter referred to as an outer inner wall surface) 63b located on the outer side of the cylinder head 3, and an inner wall surface (the other inner wall surface) located on the inner side of the cylinder head 3. It has an inner wall surface, hereinafter referred to as an inner inner wall surface) 63c. The gasket 10 includes an annular first contact portion 11 that contacts the bottom surface 63a of the mounting groove 63 in a compressed state, and an annular second contact portion 12 that contacts the sealed surface 3a of the cylinder head 3. As shown in FIG. 2A, the first contact portion 11 and the second contact portion 12 have a chevron shape having a substantially isosceles triangle cross section. As shown in FIG. 2B, the first contact portion 11 and the second contact portion 12 are formed on the bottom surface 63a of the mounting groove 63 and the sealed surface 3a of the cylinder head 3 in a state where the gasket 10 is compressed. It means the part that comes into contact with the width (by design).

ガスケット１０は、さらに圧縮状態で取付溝６３の外側内壁面６３ｂに接触する環状の第３接触部１３と、取付溝６３の内側内壁面６３ｃに接触する環状の第４接触部１４とを備える。したがって、この場合は、内側内壁面６３ｃがシール対象媒体側とされる。
また、第３接触部１３及び第４接触部１４は、ガスケット１０の全周に亘る環状の第１突条１３１及び第２突条１４１をそれぞれ含む。第１突条１３１及び第２突条１４１は、図２（ａ）に示すように断面形状が略二等辺三角形とされている。第３接触部１３及び第４接触部１４は、図２（ｂ）に示すようにガスケット１０の圧縮状態で取付溝６３の外側内壁面６３ｂ及び内側内壁面６３ｃに、所定の（設計上の）幅で接触する部分を意味する。そして、第１突条１３１及び第２突条１４１は、それぞれ第３接触部１３及び第４接触部１４の上下方向の略中間部に位置するように設けられる。さらに、第１接触部１１から隣接する第３接触部１３に至る外周部分１１３は、第１の弾性部材１０１によって構成されている。第２接触部１２から隣接する第４接触部１４に至る外周部分１２４は、第２の弾性部材１０２によって構成されている。本実施形態のガスケット１０では、第１の弾性部材１０１が第３接触部１３における第１突条１３１を含むとともに、第１接触部１１から第４接触部に至る外周部分１１４、及び、第２接触部１２から第３接触部に至る外周部分１２３のうちの第３接触部側の一部をも含む。また、第２の弾性部材１０２が第４接触部１４における第２突条１４１を含むように構成されている。 The gasket 10 further includes an annular third contact portion 13 that contacts the outer inner wall surface 63b of the mounting groove 63 in a compressed state, and an annular fourth contact portion 14 that contacts the inner inner wall surface 63c of the mounting groove 63. Therefore, in this case, the inner inner wall surface 63c is set to the sealing target medium side.
Further, the third contact portion 13 and the fourth contact portion 14 include an annular first ridge 131 and a second ridge 141 over the entire circumference of the gasket 10, respectively. As shown in FIG. 2A, the cross-sectional shape of the first ridge 131 and the second ridge 141 is a substantially isosceles triangle. As shown in FIG. 2B, the third contact portion 13 and the fourth contact portion 14 are formed on the outer inner wall surface 63b and the inner inner wall surface 63c of the mounting groove 63 in a compressed state of the gasket 10 (by design). It means the part that comes into contact with the width. The first ridge 131 and the second ridge 141 are provided so as to be located at substantially intermediate portions in the vertical direction of the third contact portion 13 and the fourth contact portion 14, respectively. Further, the outer peripheral portion 113 from the first contact portion 11 to the adjacent third contact portion 13 is composed of the first elastic member 101. The outer peripheral portion 124 from the second contact portion 12 to the adjacent fourth contact portion 14 is composed of the second elastic member 102. In the gasket 10 of the present embodiment, the first elastic member 101 includes the first ridge 131 in the third contact portion 13, the outer peripheral portion 114 from the first contact portion 11 to the fourth contact portion, and the second. It also includes a part of the outer peripheral portion 123 from the contact portion 12 to the third contact portion on the third contact portion side. Further, the second elastic member 102 is configured to include the second ridge 141 in the fourth contact portion 14.

次に本実施形態におけるガスケット１０の嵌め入れ状態及び圧縮状態について、さらに詳しく説明する。
ガスケット１０は、図２（ａ）に示すように、ヘッドカバー６における取付溝６３に対し、山形の第１接触部１１の頂部１１ａが底面６３ａに当接するように嵌め入れられる。この嵌め入れ状態では、第３接触部１３の第１突条１３１が外側内壁面６３ｂに当接し、第４接触部１４の第２突条１４１が内側内壁面６３ｃに当接する。さらに、ガスケット１０の第２接触部１２側の部分が開口部６３ｄより下側に突出する。このようにガスケット１０を嵌め入れた状態で、ヘッドカバー６を反転させて、ヘッドカバー６の被シール面６ａがシリンダヘッド３の被シール面３ａに対向するようにシリンダヘッド３上に配置する。この時、ガスケット１０の第１突条１３１及び第２突条１４１が、それぞれ外側内壁面６３ｂ及び内側内壁面６３ｃに当接しているから、そのゴム弾性によって反転の際のガスケット１０の落下や倒れが防止される。この配置状態では、ガスケット１０における山形の第２接触部１２の頂部１２ａがシリンダヘッド３の被シール面３ａに当接する。
なお、以下において、チェーンカバー５についての記載を省略するが、ヘッドカバー６とチェーンカバー５との間においても本実施形態のガスケット１０が圧縮状態で介在し、以下の作用効果がこの介在部分でも発揮される。 Next, the fitted state and the compressed state of the gasket 10 in the present embodiment will be described in more detail.
As shown in FIG. 2A, the gasket 10 is fitted into the mounting groove 63 of the head cover 6 so that the top portion 11a of the chevron first contact portion 11 abuts on the bottom surface 63a. In this fitted state, the first ridge 131 of the third contact portion 13 abuts on the outer inner wall surface 63b, and the second ridge 141 of the fourth contact portion 14 abuts on the inner inner wall surface 63c. Further, the portion of the gasket 10 on the second contact portion 12 side projects downward from the opening 63d. With the gasket 10 fitted in this way, the head cover 6 is inverted and arranged on the cylinder head 3 so that the sealed surface 6a of the head cover 6 faces the sealed surface 3a of the cylinder head 3. At this time, since the first ridge 131 and the second ridge 141 of the gasket 10 are in contact with the outer inner wall surface 63b and the inner inner wall surface 63c, respectively, the rubber elasticity causes the gasket 10 to fall or fall during inversion. Is prevented. In this arrangement state, the top portion 12a of the chevron second contact portion 12 of the gasket 10 comes into contact with the surface to be sealed 3a of the cylinder head 3.
Although the description of the chain cover 5 is omitted below, the gasket 10 of the present embodiment is interposed between the head cover 6 and the chain cover 5 in a compressed state, and the following actions and effects are exhibited in this intervening portion as well. Will be done.

前記のようにシリンダヘッド３上にヘッドカバー６を配置した後、図２（ｂ）に示すように、ボルト６２のねじ込みによって、ヘッドカバー６をシリンダヘッド３に締結する。この締結によって、ガスケット１０がヘッドカバー６とシリンダヘッド３との間に圧縮状態で介在する。この圧縮は、ボルト６２の締結方向に沿ってなされ、これによって、第１接触部１１及び第２接触部１２は、それぞれの頂部１１ａ，１２ａを包含した状態で圧縮弾性変形して取付溝６３の底面６３ａ及びシリンダヘッド３の被シール面３ａにそれぞれ幅広に弾性的に接触する。また、この圧縮に伴いガスケット１０の上下方向の中間部が幅方向に拡大し、第３接触部１３及び第４接触部１４が、それぞれ第１突条１３１及び第２突条１４１を包含した状態で弾性変形して取付溝６３の外側内壁面６３ｂ及び内側内壁面６３ｃに弾性的に接触する。 After arranging the head cover 6 on the cylinder head 3 as described above, the head cover 6 is fastened to the cylinder head 3 by screwing the bolt 62 as shown in FIG. 2 (b). By this fastening, the gasket 10 is interposed between the head cover 6 and the cylinder head 3 in a compressed state. This compression is performed along the fastening direction of the bolt 62, whereby the first contact portion 11 and the second contact portion 12 are compressionally elastically deformed so as to include the top portions 11a and 12a, respectively, of the mounting groove 63. It is in wide elastic contact with the bottom surface 63a and the sealed surface 3a of the cylinder head 3, respectively. Further, with this compression, the vertical intermediate portion of the gasket 10 expands in the width direction, and the third contact portion 13 and the fourth contact portion 14 include the first ridge 131 and the second ridge 141, respectively. It elastically deforms and comes into elastic contact with the outer inner wall surface 63b and the inner inner wall surface 63c of the mounting groove 63.

前記のように、本実施形態のガスケット１０が圧縮状態で介在された状態では、第１接触部１１及び第２接触部１２がそれぞれヘッドカバー６における取付溝６３の底面６３ａ及びシリンダヘッド３の被シール面３ａに弾性的に接触するから、シリンダヘッド３及びヘッドカバー６との間が密封される。これによって、シリンダヘッド３内の高温ガス（シール対象媒体）の外部漏出が防止される。しかも、このガスケット１０の圧縮状態では、環状の第１突条１３１及び第２突条１４１をそれぞれ含む第３接触部１３及び第４接触部１４が、取付溝６３の外側内壁面６３ｂ及び内側内壁面６３ｃに、それぞれ弾性変形を伴い充分な面圧をもって弾性的に接触する。これによって、シール性がより効果的に発揮される。さらに、本実施形態のガスケット１０では、第１接触部１１から第１突条１３１を含む第３接触部１３に至る外周部分１１３が第１弾性部材１０１で構成され、第２接触部から第２突条１４１を含む第４接触部１４に至る外周部分１２４が第２の弾性部材１０２で構成されている。したがって、第１の弾性部材１０１及び第２の弾性部材１０２を、次のようなゴム材で構成すれば、本実施形態特有の構造的な特性からシール機能を高めるとともに、耐媒体性を備え、経済性をも考慮した合理的なガスケット１０の設計を容易にすることができる。即ち、シール対象媒体に接することが少ない第１の弾性部材１０１を、適度なゴム弾性を有し、且つ、安価で汎用性の高いゴム材で構成する。また、シリンダヘッド３内のシール対象媒体である油性ガスを含む高温ガスに接する第２の弾性部材１０２を耐薬品性や耐熱性に優れるゴム材で構成する。 As described above, in the state where the gasket 10 of the present embodiment is interposed in the compressed state, the first contact portion 11 and the second contact portion 12 are sealed on the bottom surface 63a of the mounting groove 63 in the head cover 6 and the cylinder head 3, respectively. Since it comes into elastic contact with the surface 3a, the space between the cylinder head 3 and the head cover 6 is sealed. This prevents the high temperature gas (sealing target medium) in the cylinder head 3 from leaking to the outside. Moreover, in the compressed state of the gasket 10, the third contact portion 13 and the fourth contact portion 14, which include the annular first ridges 131 and the second ridges 141, respectively, are formed on the outer inner wall surface 63b and the inner inner surface of the mounting groove 63. Each of the wall surfaces 63c is elastically deformed and elastically contacted with sufficient surface pressure. As a result, the sealing property is more effectively exhibited. Further, in the gasket 10 of the present embodiment, the outer peripheral portion 113 from the first contact portion 11 to the third contact portion 13 including the first ridge 131 is composed of the first elastic member 101, and the second contact portion to the second contact portion to the second. The outer peripheral portion 124 leading to the fourth contact portion 14 including the ridge 141 is composed of the second elastic member 102. Therefore, if the first elastic member 101 and the second elastic member 102 are made of the following rubber materials, the sealing function is enhanced from the structural characteristics peculiar to the present embodiment, and the medium resistance is provided. It is possible to facilitate the design of a rational gasket 10 in consideration of economic efficiency. That is, the first elastic member 101, which is less likely to come into contact with the medium to be sealed, is made of a rubber material having appropriate rubber elasticity, low cost, and high versatility. Further, the second elastic member 102 in contact with the high temperature gas including the oily gas which is the medium to be sealed in the cylinder head 3 is made of a rubber material having excellent chemical resistance and heat resistance.

＜第一の実施形態の変形例＞
図３（ａ）及び（ｂ）は本実施形態のガスケット１０の変形例を示す。
図３（ａ）に示すガスケット１０は、第１の弾性部材１０１及び第２の弾性部材１０２からなり、これらが接合される接合部１００の断面形状は、図に示すように右側に傾斜した直線形状とされている。このような形状は、成型のし易さ等を勘案し、前記二色成型時における金型の形状の選択によって、任意に設定することができる。
その他の構成は前記実施形態と同様であるから、共通部分に同一の符号を付し、その説明を割愛する。 <Modified example of the first embodiment>
3 (a) and 3 (b) show a modification of the gasket 10 of this embodiment.
The gasket 10 shown in FIG. 3A is composed of a first elastic member 101 and a second elastic member 102, and the cross-sectional shape of the joint portion 100 to which these are joined is a straight line inclined to the right as shown in the figure. It is said to be in shape. Such a shape can be arbitrarily set by selecting the shape of the mold at the time of the two-color molding in consideration of ease of molding and the like.
Since the other configurations are the same as those of the above-described embodiment, the same reference numerals are given to the common parts, and the description thereof will be omitted.

図３（ｂ）に示す例のガスケット１０も、接合部１００で一体とされた第１の弾性部材１０１及び第２の弾性部材１０２からなる。そしてこれらが接合される接合部１００の断面形状は、図３（ｂ）に示すように略逆向きＪ形状とされている。図３（ｂ）では、第３接触部１３に含まれる第１突条１３１及び第４接触部１４に含まれる第２突条１４１がそれぞれ２条設けられている。それぞれ２条の第１突条１３１及び第２突条１４１は、取付溝６３（図２参照）の深さ方向（上下方向）に平行になるように形成されている。
第１接触部１１の頂部１１ａから２条の第１突条１３１，１３１を含む外周部分１１３は、第１の弾性部材１０１によって構成されている。また第１接触部１１の頂部１１ａから、上側の第２突条１４１の近傍に至る外周部分１１４も第１の弾性部材１０１によって構成されている。下側の第１突条１３１の近傍から、第２接触部１２の頂部１２ａを経て、２条の第２突条１４１，１４１を含む外周部分１２４は、薄層の第２の弾性部材１０２によって構成されている。そして、第２接触部１２には、左右両側に張出す環状の張出条体１２ｂ，１２ｃが形成されている。 The gasket 10 of the example shown in FIG. 3B is also composed of a first elastic member 101 and a second elastic member 102 integrated with the joint portion 100. The cross-sectional shape of the joint portion 100 to which these are joined is a substantially reverse J shape as shown in FIG. 3 (b). In FIG. 3B, two first ridges 131 included in the third contact portion 13 and two second ridges 141 included in the fourth contact portion 14 are provided. The first ridges 131 and the second ridges 141 of the two rows are formed so as to be parallel to the depth direction (vertical direction) of the mounting groove 63 (see FIG. 2), respectively.
The outer peripheral portion 113 including the first ridges 131 and 131 of the two ridges from the top portion 11a of the first contact portion 11 is composed of the first elastic member 101. Further, the outer peripheral portion 114 extending from the top portion 11a of the first contact portion 11 to the vicinity of the upper second ridge 141 is also composed of the first elastic member 101 . From the vicinity of the lower first ridge 131, through the top 12a of the second contact portion 12, the outer peripheral portion 124 including the second ridges 141 and 141 of the second ridge is formed by the second elastic member 102 of the thin layer. It is configured. The second contact portion 12 is formed with annular overhanging strips 12b and 12c that overhang on both the left and right sides.

図３（ｂ）のように構成されるガスケット１０においては、第１突条１３１及び第２突条１４１がそれぞれ略平行に２条存在することにより、ヘッドカバー６の取付溝６３に対する嵌め入れ状態がより安定する。また、第２の弾性部材１０２が薄層の外周部分１２４によって構成されるから、高価なゴム材によって第２の弾性部材１０２を構成する場合、当該ゴム材の使用量が少なくて済み、より経済的である。さらに、張出条体１２ｂ，１２ｃが存在するので、これらのアンダーロック形状により、型内でのものづくりがし易くなる。
その他の構成は前記実施形態と同様であるから、共通部分に同一の符号を付し、ここでもその説明を割愛する。 In the gasket 10 configured as shown in FIG. 3B, the first ridge 131 and the second ridge 141 are present in two substantially parallel to each other, so that the head cover 6 is fitted into the mounting groove 63. More stable. Further, since the second elastic member 102 is composed of the outer peripheral portion 124 of the thin layer, when the second elastic member 102 is composed of an expensive rubber material, the amount of the rubber material used can be reduced, which is more economical. It is a target. Further, since the overhanging strips 12b and 12c are present, these underlock shapes facilitate manufacturing in the mold.
Since the other configurations are the same as those of the above-described embodiment, the same reference numerals are given to the common parts, and the description thereof will be omitted here as well.

＜第二の実施形態＞
図４（ａ）～（ｄ）は第二の実施形態に係るガスケットを示す。本実施形態のガスケット１０において、第１の弾性部材１０１は、第１突条１３１及び第２突条１４１を除く第３接触部１３及び第４接触部１４を含んで構成されている。一方、第２の弾性部材１０２が、第１突条１３１及び第２突条１４１を含んで構成されている。即ち、第１接触部１１から第１突条１３１の上辺部にかけての外周部分１１３と、第１接触部１１から第２突条１４１の上辺部にかけての外周部分１１４とが、第１の弾性部材１０１によって構成される。また、第２接触部１２から第２突条１４１の上辺部にかけての外周部分１２４と、第２接触部１２から第１突条１４１の上辺部にかけての外周部分１２３とが、第２の弾性部材１０２によって構成される。
これら図４（ａ）～（ｄ）に示すガスケット１０においては、第２の弾性部材１０２が、第１突条１３１及び第２突条１４１を含んでシリンダヘッド３側に位置する。したがって、第２の弾性部材１０２を耐媒体性の優れた材料で構成することにより、本実施形態特有の構造的な特性からシール機能を高めるとともに、耐媒体性を備え、経済性をも考慮したより合理的なガスケットの設計を行うことができる。 <Second embodiment>
4 (a) to 4 (d) show the gasket according to the second embodiment. In the gasket 10 of the present embodiment, the first elastic member 101 includes a third contact portion 13 and a fourth contact portion 14 excluding the first ridge 131 and the second ridge 141. On the other hand, the second elastic member 102 is configured to include the first ridge 131 and the second ridge 141. That is, the outer peripheral portion 113 from the first contact portion 11 to the upper side portion of the first ridge 131 and the outer peripheral portion 114 from the first contact portion 11 to the upper side portion of the second ridge 141 are the first elastic members. It is composed of 101. Further, the outer peripheral portion 124 from the second contact portion 12 to the upper side portion of the second ridge 141 and the outer peripheral portion 123 from the second contact portion 12 to the upper side portion of the first ridge 141 are the second elastic members. It is composed of 102.
In the gasket 10 shown in FIGS. 4A to 4D, the second elastic member 102 includes the first ridge 131 and the second ridge 141 and is located on the cylinder head 3 side. Therefore, by constructing the second elastic member 102 with a material having excellent medium resistance, the sealing function is enhanced from the structural characteristics peculiar to the present embodiment, the medium resistance is provided, and economic efficiency is also considered. A more rational gasket design can be made.

図４（ａ）に示す例のガスケット１０は、第１の弾性部材１０１及び第２の弾性部材１０２からなり、これらが接合される接合部１００の断面形状は、図に示すように上下方向に直交する方向（左右方向）に沿った直線形状とされている。
また、図４（ｂ）～（ｄ）に示すガスケット１０では、第１の弾性部材１０１と第２の弾性部材１０２とが接合される接合部１００の断面形状が、第１の弾性部材１０１が第２の弾性部材１０２側に食込む嵌め合せ構造となる形状とされている。具体的には、図４（ｂ）に示すガスケット１０では、第１の弾性部材１０１と第２の弾性部材１０２とが接合される接合部１００の断面形状が、下向きの略二等辺三角形の山形形状（略Ｖ字状）をなす。また、図４（ｃ）に示す例のガスケット１０では、図４（ｂ）に示す例に加えて、接合部１００が、第２の弾性部材１０２内に上下方向に沿った平行な２本の直線状部分を介して前記略二等辺三角形状部分が深く食込む形状とされている。さらに、図４（ｄ）に示す例のガスケット１０では、接合部１００が、図４（ｂ）の例に加えて、左右方向に向く凹凸部分を介して前記略二等辺三角形状部分が第２の弾性部材１０２内に深く食込む形状とされている。 The gasket 10 of the example shown in FIG. 4A is composed of a first elastic member 101 and a second elastic member 102, and the cross-sectional shape of the joint portion 100 to which these are joined is in the vertical direction as shown in the figure. It has a linear shape along the orthogonal direction (left-right direction).
Further, in the gasket 10 shown in FIGS. 4 (b) to 4 (d), the cross-sectional shape of the joint portion 100 to which the first elastic member 101 and the second elastic member 102 are joined is such that the first elastic member 101 has a cross-sectional shape. The shape is such that it has a fitting structure that bites into the second elastic member 102 side. Specifically, in the gasket 10 shown in FIG. 4B, the cross-sectional shape of the joint portion 100 to which the first elastic member 101 and the second elastic member 102 are joined is a chevron shape having a substantially isosceles right triangle facing downward. It has a shape (substantially V-shaped). Further, in the gasket 10 of the example shown in FIG. 4 (c), in addition to the example shown in FIG. 4 (b), the joint portion 100 has two parallel joint portions in the second elastic member 102 along the vertical direction. The shape is such that the substantially isosceles triangular portion deeply bites through the linear portion. Further, in the gasket 10 of the example shown in FIG. 4 (d), in addition to the example of FIG. 4 (b), the joint portion 100 has a second substantially isosceles triangular portion via an uneven portion facing in the left-right direction. The shape is such that it deeply penetrates into the elastic member 102 of the above.

図４（ｂ）～（ｄ）に示すガスケット１０は、第１の弾性部材１０１と第２の弾性部材１０２とが、嵌め合せ構造で接合されているから、第１の弾性部材１０１と第２の弾性部材１０２とが安定した結合状態に維持される。特に、図４（ｄ）に示す例のガスケット１０では、接合部１００がその凹凸形状によって、第１の弾性部材１０１と第２弾性部材１０２とが噛み合うような嵌め合い構造となるから、第１の弾性部材１０１と第２の弾性部材１０２とがより安定した結合状態に維持される。また、この接合部１００の嵌め合せ構造が第２の弾性部材１０２側に食込むようになされているから、図４（ａ）の例に比べて第２の弾性部材１０２用のゴム材が第１の弾性部材１０１用のゴム材より少なくて済む。したがって、第２の弾性部材１０２として高価なゴム材を用いる場合でも、図４（ａ）に示す例より経済的である。
その他の構成は、第一の実施形態と同様であるから、共通部分に同一の符号を付し、ここでもその説明を割愛する。 In the gasket 10 shown in FIGS. 4 (b) to 4 (d), since the first elastic member 101 and the second elastic member 102 are joined by a fitting structure, the first elastic member 101 and the second elastic member 102 are joined. Is maintained in a stable bonded state with the elastic member 102 of. In particular, in the gasket 10 of the example shown in FIG. 4D, the joint portion 100 has a fitting structure in which the first elastic member 101 and the second elastic member 102 mesh with each other due to the uneven shape thereof. The elastic member 101 and the second elastic member 102 are maintained in a more stable bonded state. Further, since the fitting structure of the joint portion 100 is made to bite into the second elastic member 102 side, the rubber material for the second elastic member 102 is different from the example of FIG. 4A. It requires less than the rubber material for the elastic member 101 of 1. Therefore, even when an expensive rubber material is used as the second elastic member 102, it is more economical than the example shown in FIG. 4 (a).
Since the other configurations are the same as those in the first embodiment, the same reference numerals are given to the common parts, and the description thereof is omitted here as well.

＜第三の実施形態＞
図５は第三の実施形態に係るガスケットを示す。本実施形態のガスケット１０は、第１の弾性部材１０１が、第１接触部１１から第１突条１３１及び第２突条１４１に至る部分を含んで構成されている。また第２の弾性部材１０２は、第２接触部１２から第１突条１３１及び第２突条１４１に至る部分を含んで構成されている。即ち、第１接触部１１から第１突条１３１の上半部（上下方向中間部より上側）にかけての外周部分１１３と、第１接触部１１から第２突条１４１の上半部（上下方向中間部より上側）にかけての外周部分１１４とは、第１の弾性部材１０１によって構成される。また、第２接触部１２から第２突条１４１の下半部（上下方向中間部より下側）にかけての外周部分１２４と、第２接触部１２から第１突条１４１の下半部上下方向中間部より下側）にかけての外周部分１２３とは、第２の弾性部材１０２によって構成される。そして、第１の弾性部材１０１と第２の弾性部材１０２とが接合される接合部１００は、その断面形状が第１突条１３１及び第２突条１４１の各中間部を結んでガスケット１０の左右方向に沿った直線状の形状とされている。 <Third embodiment>
FIG. 5 shows the gasket according to the third embodiment. The gasket 10 of the present embodiment is configured such that the first elastic member 101 includes a portion extending from the first contact portion 11 to the first ridge 131 and the second ridge 141. Further, the second elastic member 102 is configured to include a portion extending from the second contact portion 12 to the first ridge 131 and the second ridge 141. That is, the outer peripheral portion 113 from the first contact portion 11 to the upper half portion (upper side of the vertical intermediate portion) of the first ridge 131, and the upper half portion (vertical direction) from the first contact portion 11 to the second ridge 141. The outer peripheral portion 114 extending from the intermediate portion to the upper side) is composed of the first elastic member 101. Further, the outer peripheral portion 124 from the second contact portion 12 to the lower half portion of the second ridge 141 (below the middle portion in the vertical direction) and the lower half portion of the first ridge 141 in the vertical direction from the second contact portion 12 to the vertical direction. The outer peripheral portion 123 extending from the middle portion to the lower side) is composed of a second elastic member 102. The joint portion 100 to which the first elastic member 101 and the second elastic member 102 are joined has a cross-sectional shape of connecting the intermediate portions of the first ridge 131 and the second ridge 141 to form the gasket 10. It has a linear shape along the left-right direction.

図５に示す例のガスケット１０は、第２の弾性部材１０２によって構成される外周部分１２３，１２４がシリンダヘッド３側に位置し、且つ、外周部分１２４がシール対象媒体側に位置する。したがって、第２の弾性部材１０２を耐媒体性（特に、耐熱性）に優れるゴム材で構成することにより、本実施形態特有の構造的な特性からシール機能を高めるとともに、耐媒体性を備え、経済性をも考慮したより合理的なガスケット１０の設計を行うことができる。
その他の構成は、第一の実施形態と同様であるから、共通部分に同一の符号を付し、ここでもその説明を割愛する。 In the gasket 10 of the example shown in FIG. 5, the outer peripheral portions 123 and 124 composed of the second elastic member 102 are located on the cylinder head 3 side, and the outer peripheral portions 124 are located on the sealing target medium side. Therefore, by forming the second elastic member 102 with a rubber material having excellent medium resistance (particularly heat resistance), the sealing function is enhanced from the structural characteristics peculiar to the present embodiment, and the medium resistance is provided. A more rational design of the gasket 10 can be made in consideration of economic efficiency.
Since the other configurations are the same as those in the first embodiment, the same reference numerals are given to the common parts, and the description thereof is omitted here as well.

＜第四の実施形態＞
図６は第四の実施形態に係るガスケットを示す。本実施形態のガスケット１０は、第１の弾性部材１０１が、第１接触部１１の一部、第３接触部１３の全体、及び、第２接触部１２の一部を含んで構成されている。また第２の弾性部材１０２が、第１接触部１１の一部、第４接触部１４の全体、及び、第２接触部１２の一部を含んで構成されている。即ち、第１接触部１１の右半部（一部）から第１突条１３１にかけての外周部分１１３及び第２接触部１２の右半部（一部）から第１突条１３１にかけての外周部分１２３が第１の弾性部材１０１によって構成される。また、第１接触部１１の左半部（一部）から第２突条１４１にかけての外周部分１１４及び第２接触部１２の左半部（一部）から第２突条１４１にかけての外周部分１２４が第２の弾性部材１０２によって構成される。そして、第１の弾性部材１０１と第２の弾性部材１０２とが接合される接合部１００の断面形状は、図６に示すように第１接触部１１における頂部１１ａ及び第２接触部１２における頂部１２ａの中央部を結んでガスケット１０の上下方向に沿った直線形状とされている。
この例のガスケット１０は、第２の弾性部材２によって構成される外周部分１１４，１２４が、シール対象媒体側に位置する。したがって、第２の弾性部材１０２を耐媒体性（特に、耐熱性）に優れるゴム材で構成することにより、本実施形態特有の構造的な特性からシール機能を高めるとともに、耐媒体性を備え、経済性をも考慮したより合理的なガスケット１０の設計を行うことができる。 <Fourth Embodiment>
FIG. 6 shows the gasket according to the fourth embodiment. In the gasket 10 of the present embodiment, the first elastic member 101 is configured to include a part of the first contact portion 11, the whole of the third contact portion 13, and a part of the second contact portion 12. .. Further, the second elastic member 102 is configured to include a part of the first contact portion 11, the whole of the fourth contact portion 14, and a part of the second contact portion 12. That is, the outer peripheral portion 113 from the right half portion (part) of the first contact portion 11 to the first ridge 131 and the outer peripheral portion from the right half portion (part) of the second contact portion 12 to the first ridge 131. 123 is composed of the first elastic member 101. Further, the outer peripheral portion 114 from the left half portion (part) of the first contact portion 11 to the second ridge 141 and the outer peripheral portion from the left half portion (part) of the second contact portion 12 to the second ridge 141. 124 is composed of a second elastic member 102. As shown in FIG. 6, the cross-sectional shape of the joint portion 100 to which the first elastic member 101 and the second elastic member 102 are joined is the top portion 11a of the first contact portion 11 and the top portion of the second contact portion 12. The central portion of 12a is connected to form a linear shape along the vertical direction of the gasket 10.
In the gasket 10 of this example, the outer peripheral portions 114 and 124 formed by the second elastic member 2 are located on the side of the medium to be sealed. Therefore, by forming the second elastic member 102 with a rubber material having excellent medium resistance (particularly heat resistance), the sealing function is enhanced from the structural characteristics peculiar to the present embodiment, and the medium resistance is provided. A more rational design of the gasket 10 can be made in consideration of economic efficiency.

＜第五の実施形態＞
図７（ａ）及び（ｂ）は第五の実施形態に係るガスケットを示す。本実施形態のガスケット１０は、第１接触部１１が径方向（左右方向）の略中央で分断された２つの分断接触部１１Ａ，１１Ｂからなり、第２接触部１２が径方向（左右方向）の略中央で分断された２つの分断接触部１２Ａ，１２Ｂからなる。そして、第１接触部１１及び第２接触部１２は、いずれも左右方向に沿った平坦面とされ、その各中央部に断面形状がＶノッチ形状の環状溝部１１ｂ，１２ｂを有している。そして、この環状溝部１１ｂ，１２ｂによって左右に分断されている。 <Fifth Embodiment>
7 (a) and 7 (b) show the gasket according to the fifth embodiment. In the gasket 10 of the present embodiment, the first contact portion 11 is composed of two divided contact portions 11A and 11B divided at substantially the center in the radial direction (left-right direction), and the second contact portion 12 is radially (left-right direction). It is composed of two divided contact portions 12A and 12B divided at substantially the center of the above. The first contact portion 11 and the second contact portion 12 are both flat surfaces along the left-right direction, and each of the central portions thereof has annular groove portions 11b and 12b having a V-notch cross section. Then, it is divided into left and right by the annular groove portions 11b and 12b.

図７（ａ）に示すガスケット１０は、第四の実施形態の構成も含む。即ち、第１接触部１１の一部である分断接触部１１Ａから第１突条１３１にかけての外周部分１１３及び第２接触部１２の一部である分断接触部１２Ａから第１突条１３１にかけての外周部分１２３が第１の弾性部材１０１によって構成される。また、第１接触部１１の一部である分断接触部１１Ｂから第２突条１４１にかけての外周部分１１４及び第２接触部１２の一部である分断接触部１２Ｂから第２突条１４１にかけての外周部分１２４が第２の弾性部材１０２によって構成される。したがって、第１の弾性部材１０１は第３接触部１３における第１突条１３１を含んで構成されている。そして第２の弾性部材１０２は第４接触部１４における第２突条１４１を含んで構成されている。そして、第１の弾性部材１０１と第２の弾性部材１０２とが接合される接合部１００の断面形状は、図７（ａ）に示すように第１接触部１１における環状溝部１１ｂ及び第２接触部１２における環状溝部１２ｂの中間部（Ｖノッチ形状の先端部）を結んでガスケット１０の上下方向に沿った直線形状とされている。
この例のガスケット１０は、シール対象媒体側に位置する外周部分１１４，１２４が第２の弾性部材１０２によって構成されるから、第２の弾性部材１０２を耐媒体性（特に、耐熱性）に優れるゴム材で構成することにより、本実施形態特有の構造的な特性からシール機能を高めるとともに、耐媒体性を備え、経済性をも考慮したより合理的なガスケット１０の設計を行うことができる。 The gasket 10 shown in FIG. 7A also includes the configuration of the fourth embodiment. That is, from the outer peripheral portion 113 from the split contact portion 11A which is a part of the first contact portion 11 to the first ridge 131 and from the split contact portion 12A to the first ridge 131 which is a part of the second contact portion 12. The outer peripheral portion 123 is composed of the first elastic member 101. Further, the outer peripheral portion 114 from the split contact portion 11B which is a part of the first contact portion 11 to the second ridge 141 and the split contact portion 12B to the second ridge 141 which is a part of the second contact portion 12 The outer peripheral portion 124 is composed of the second elastic member 102. Therefore, the first elastic member 101 is configured to include the first ridge 131 in the third contact portion 13. The second elastic member 102 is configured to include the second ridge 141 in the fourth contact portion 14. Then, as shown in FIG. 7A, the cross-sectional shape of the joint portion 100 to which the first elastic member 101 and the second elastic member 102 are joined is the annular groove portion 11b and the second contact in the first contact portion 11. The intermediate portion (the tip portion of the V-notch shape) of the annular groove portion 12b in the portion 12 is connected to form a linear shape along the vertical direction of the gasket 10.
In the gasket 10 of this example, since the outer peripheral portions 114 and 124 located on the sealing target medium side are composed of the second elastic member 102, the second elastic member 102 is excellent in medium resistance (particularly heat resistance). By being made of a rubber material, it is possible to design a more rational gasket 10 in consideration of economic efficiency, as well as enhancing the sealing function from the structural characteristics peculiar to the present embodiment and providing medium resistance.

図７（ｂ）に示すガスケット１０は、第１接触部１１（分断接触部１１Ａ）から第３接触部１３に至る外周部分１１３、第１接触部１１（分断接触部１１Ｂ）から第４接触部１４に至る外周部分１１４、及び、第２接触部１２（分断接触部１２Ａ）から第３接触部１３に至る外周部分１２３が第１の弾性部材１０１によって構成されている。また、第２接触部１２（分断接触部１２Ｂ）から第４接触部１４に至る外周部分１２４が第２の弾性部材１０２によって構成されている。したがって、第１の弾性部材１０１は、第３接触部１３における第１突条１３１を含むが、第４接触部１４における第２突条１４１は第１の弾性部材１０１及び第２の弾性部材１０２によって構成される。そして、第１の弾性部材１０１と第２の弾性部材１０２とが接合される接合部１００の断面形状は、図７（ｂ）に示すように第２突条１４１の頂部からの右向き線部と環状溝部１２ｂの中央部からの上向き線部とが交差する逆さＬ形の形状とされる。
この例のガスケット１０においては、シリンダヘッド３側且つシール対象媒体側に位置する外周部分１２４が第２の弾性部材１０２によって構成されるから、第２の弾性部材１０２を耐媒体性（特に、耐熱性）に優れるゴム材で構成することにより、本実施形態特有の構造的な特性及び耐媒体性をからませて、シール性さらには経済性を考慮したより合理的なガスケット１０の設計を行うことができる。この場合、図７（ａ）に示す例より、第２の弾性部材１０２の占める部分が少ないから、第２の弾性部材として高価なゴム材を使用する場合でも、コストの高騰を抑えることができ経済的である。 The gasket 10 shown in FIG. 7B has an outer peripheral portion 113 from the first contact portion 11 (partitioned contact portion 11A) to the third contact portion 13, and a fourth contact portion from the first contact portion 11 (divided contact portion 11B). The outer peripheral portion 114 leading to 14, and the outer peripheral portion 123 extending from the second contact portion 12 (divided contact portion 12A) to the third contact portion 13 are composed of the first elastic member 101. Further, the outer peripheral portion 124 from the second contact portion 12 (divided contact portion 12B) to the fourth contact portion 14 is composed of the second elastic member 102. Therefore, the first elastic member 101 includes the first ridge 131 in the third contact portion 13, while the second ridge 141 in the fourth contact portion 14 includes the first elastic member 101 and the second elastic member 102. Consists of. The cross-sectional shape of the joint portion 100 to which the first elastic member 101 and the second elastic member 102 are joined is the rightward line portion from the top of the second ridge 141 as shown in FIG. 7 (b). The shape is an inverted L shape in which the upward line portion from the central portion of the annular groove portion 12b intersects.
In the gasket 10 of this example, since the outer peripheral portion 124 located on the cylinder head 3 side and the sealing target medium side is composed of the second elastic member 102, the second elastic member 102 has medium resistance (particularly heat resistance). By constructing a rubber material having excellent properties), the structural characteristics and medium resistance peculiar to the present embodiment are entwined, and a more rational gasket 10 is designed in consideration of sealing property and economic efficiency. Can be done. In this case, since the portion occupied by the second elastic member 102 is smaller than that in the example shown in FIG. 7A, it is possible to suppress the increase in cost even when an expensive rubber material is used as the second elastic member. It is economical.

なお、前記実施形態では、シール対象の２部材が、シリンダヘッド３及びヘッドカバー６（チェーンカバー５）である例について述べたが、オイルパン及びシリンダブロック、チェーンカバー及びシリンダブロック、チェーンカバー及びシリンダヘッド、インテークマニホールド及びシリンダヘッド、更には、オイルクーラー及びシリンダブロックであっても、同様に本実施形態のガスケットが適用される。また、前記実施形態では、ヘッドカバー６がシリンダヘッド３及びチェーンカバー５の上端に跨るように締結される例について述べたが、ヘッドカバー６がシリンダヘッド３のみに締結される場合であっても良い。また、ガスケットの左右方向両側部に、複数の縦リブを周方向に適宜間隔で設けてもよく、これによって、取付溝６３に嵌め入れた後のガスケット１０の脱落や倒れがより的確に防止される。さらに、第１の弾性部材１０１及び第２の弾性部材１０２は、いわゆる二色成型によって結合一体とされる場合の他、それぞれ個別に成型し、これらを接着剤で一体とし、或いは、高周波加熱による融着で一体とすることも可能である。さらにまた、自動車用エンジンに用いられるものに限らず、低温環境や高温環境或いは各種薬品が流通する環境等で使用される配管の継ぎ手部や各種容器等にも、本実施形態のガスケットが適用可能である。加えて、特許請求の範囲を逸脱しない限り、前記各実施形態の構成を適宜組み合わせて本実施形態に係るガスケットとすることはもとより可能である。 In the above embodiment, the example in which the two members to be sealed are the cylinder head 3 and the head cover 6 (chain cover 5) has been described, but the oil pan and the cylinder block, the chain cover and the cylinder block, the chain cover and the cylinder head have been described. Similarly, the gasket of the present embodiment is applied to the intake manifold and the cylinder head, and further to the oil cooler and the cylinder block. Further, in the above embodiment, the example in which the head cover 6 is fastened so as to straddle the upper ends of the cylinder head 3 and the chain cover 5 has been described, but the head cover 6 may be fastened only to the cylinder head 3. Further, a plurality of vertical ribs may be provided on both left and right sides of the gasket at appropriate intervals in the circumferential direction, whereby the gasket 10 may be more accurately prevented from falling off or falling after being fitted into the mounting groove 63. To. Further, the first elastic member 101 and the second elastic member 102 are combined and integrated by so-called two-color molding, or they are individually molded and integrated with an adhesive, or by high-frequency heating. It is also possible to integrate them by fusion. Furthermore, the gasket of this embodiment can be applied not only to those used for automobile engines, but also to pipe joints and various containers used in low temperature environments, high temperature environments, environments in which various chemicals are distributed, and the like. Is. In addition, as long as it does not deviate from the scope of claims, it is possible to appropriately combine the configurations of the above-described embodiments to form a gasket according to the present embodiment.

３シリンダヘッド（他方の部材）
５チェーンカバー（他方の部材）
６ヘッドカバー（一方の部材）
６３取付溝
６３ａ底面
６３ｂ外側（一方の）内壁面
６３ｃ内側（他方の）内壁面
１０ガスケット
１００接合部
１０１第１の弾性部材
１０２第２の弾性部材
１１第１接触部
１１３外周部分
１１４外周部分
１１Ａ，１１Ｂ分断接触部
１１ｂ環状溝部
１２第２接触部
１２３外周部分
１２４外周部分
１２Ａ，１２Ｂ分断接触部
１２ｂ環状溝部
１３第３接触部
１３１第１突条
１４第４接触部
１４１第２突条 3 Cylinder head (the other member)
5 Chain cover (the other member)
6 Head cover (one member)
63 Mounting groove 63a Bottom surface 63b Outer (one) inner wall surface 63c Inner (one) inner wall surface 10 Gasket 100 Joint 101 First elastic member 102 Second elastic member 11 First contact part 113 Outer peripheral part 114 Outer peripheral part 11A , 11B Divided contact part 11b Circular groove part 12 Second contact part 123 Outer peripheral part 124 Outer peripheral part 12A, 12B Divided contact part 12b Circular groove part 13 Third contact part 131 First ridge 14 Fourth contact part 141 Second ridge

Claims

An annular gasket that is placed facing each other and sealed in a compressed state so that the medium to be sealed does not leak from between two members that are fastened to each other by the fastening member .
It is used by fitting it into an annular mounting groove formed in one of the members constituting the two members.
A first elastic member made of an elastic material and a second elastic member made of an elastic material different from the first elastic member are integrally joined to each other.
In the compressed state, it contacts the first contact portion that contacts the bottom surface of the mounting groove, the second contact portion that contacts the other member constituting the two members, and the inner wall surface of one of the mounting grooves. A third contact portion and a fourth contact portion that contacts the other inner wall surface of the mounting groove are provided.
The third contact portion is provided with an annular first ridge extending over the entire circumference and projecting in a direction of bullet contact with one of the inner wall surfaces.
The fourth contact portion is provided with an annular second ridge extending over the entire circumference and projecting in a direction of bullet contact with the other inner wall surface.
The second elastic member reaches the third contact portion adjacent to the second contact portion, reaches the outer peripheral portion including the first ridge, and reaches the fourth contact portion adjacent to the second contact portion. Consists of the outer peripheral part including 2 ridges ,
The first elastic member is a gasket having a fitting structure that bites into the second elastic member side and constitutes a portion excluding the second elastic member including the first contact portion .

In the gasket according to claim 1,
The second elastic member is a gasket made of a material having resistance to the medium to be sealed .

In the gasket according to claim 1 or 2 .
The first ridge is provided in a substantially intermediate portion of the third contact portion, and the first ridge is provided.
The second ridge is a gasket characterized in that it is provided in a substantially intermediate portion of the fourth contact portion .

In the gasket according to any one of claims 1 to 3 .
The first contact portion has a chevron shape of a substantially isosceles triangle protruding toward the bottom surface of the mounting groove.
The second contact portion is a gasket characterized in that it has a chevron shape of a substantially isosceles triangle protruding toward the other member .

In the gasket according to any one of claims 1 to 4 .
A gasket characterized in that the joint portion to which the first elastic member and the second elastic member are joined has a cross-sectional shape including a substantially isosceles triangle shape .

In the gasket according to claim 5 ,
The gasket is characterized in that the cross-sectional shape of the joint portion includes an uneven portion .

In the gasket according to any one of claims 1 to 6.
A gasket characterized in that one of the members is a cylinder head cover of an automobile engine, and the other member is a cylinder head or a chain cover .