JP4514010B2

JP4514010B2 - Metal gasket

Info

Publication number: JP4514010B2
Application number: JP2001236090A
Authority: JP
Inventors: 憲司沖永; 哲也飛弾
Original assignee: Nippon Reinz Co Ltd
Current assignee: Nippon Reinz Co Ltd
Priority date: 2001-08-03
Filing date: 2001-08-03
Publication date: 2010-07-28
Anticipated expiration: 2021-08-03
Also published as: JP2003049948A

Description

【０００１】
【発明の属する技術分野】
この発明に係るメタルガスケットは、例えば自動車の走行用エンジンの排気系に組み込んでこの排気系を構成すべく、互いに結合される１対の部材の突き合わせ面同士の間の気密保持を図る為、この突き合わせ面同士の間に挟持した状態で使用する。
【０００２】
【従来の技術】
エンジンのシリンダヘッドから吐出される排気は、途中に排気浄化器や消音器を設けた排気系を通じて大気中に放出される。この様な排気系は、これら排気浄化器や消音器を含む複数の部材を、排気の流通方向に関して互いに直列に接続する事で構成する為、接続部の気密保持を図る事が必要になる。又、この気密保持の為の構造は、高温の排気が流通する事を考慮して、十分な耐熱性を有するものとする必要がある。又、接続作業は、自動車の床下の限られた空間内で行なう場合が多く、気密保持部材を組み付ける相手面が傾斜或は下向きの状態となっている事が多い。又、接続部が上向きであっても、流れ作業の場合等は、組み付けの途中で移動する事があり、その際の振動によって上記気密保持部材が動いてしまう事もある。これらの事を考慮して従来から、上記接続部に金属板製のメタルガスケットを組み付けると共に、このメタルガスケットが接続作業の途中で脱落する事を防止する構造を採用する事が行なわれている。
【０００３】
この様な従来構造の１例として図６〜７に、実開平４−６８２４９号公報に記載されている構造を示す。この従来構造は、図６に示す様なエキゾーストマニホールド１の上流端部分を図示しないエンジンのシリンダブロックの側面に接続する部分に関するものである。上記エキゾーストマニホールド１は、このシリンダブロックの側面に開口した排気ポートの数に合わせて設けた複数本（図示の例では４本）の分岐管部２、２の下流端に１本の合流管部３を設けて成る。これら各分岐管部２、２の上流端部には上流端フランジ４、４を、上記合流管部３の下流端には下流端フランジ５を、それぞれ設けている。このうちの上流端フランジ４、４は、図７に示す様なメタルガスケット６を介して上記シリンダブロックの側面に接続し、上記下流端フランジ５には図示しないメタルガスケットを介して、やはり図示しない排気管の上流端を接続する。
【０００４】
上記メタルガスケット６は、弾性を有する金属板を上記上流端フランジ４の形状に合わせて菱形に形成して成り、中央部に排気を通過させる為の透孔７を、この透孔７を挟む２個所位置にそれぞれ杆状部材であるスタッドを挿通する為の１対の通孔８、８を、それぞれ設けている。又、上記メタルガスケット６の反対側縁には１対の係止片９、９を設けている。この様なメタルガスケット６は上記上流端フランジ４に重ね合わせた状態で、上記１対の係止片９、９によりこの上流端フランジ４の周縁部を抑え付け、この上流端フランジ４に仮止めする。そして、上記各通孔８、８及びこの上流端フランジ４に形成した通孔１０、１０に、上記シリンダブロックの側面で排気ポートを挟む位置に突設した１対のスタッドを挿通し、これら各スタッドの先端部で上記上流端フランジ４から突出した部分にナットを螺合し更に緊締する。この作業により、上記シリンダブロックの側面と上記上流端フランジ４とを、上記メタルガスケット６を介して結合する。
【０００５】
【発明が解決しようとする課題】
図７に示す様なメタルガスケット６は、エキゾーストマニホールド１とシリンダブロックとの結合作業時に上流端フランジ４の所定部位に仮固定しておける為、この結合作業の容易化を図れる。但し、係止片９、９を設ける分、材料の歩留が悪くなり、製造コストが嵩むだけでなく、これら各係止片９、９の間に上記上流端フランジ４を押し込む作業が面倒で、必ずしも上記結合作業の能率化を十分に図れない。又、上記各係止片９、９がある為、製品である上記メタルガスケット６をまとめて搬送する際に重ね合わせづらく、嵩張るだけでなく、上記各係止片９、９の先端が他のメタルガスケット６を傷付けない様に注意する必要がある。この為、搬送作業の能率が低下すると言った問題もある。
【０００６】
メタルガスケットを装着部に仮固定する為の技術としてはこの他にも、実開平４−８８５０５号公報、同４−１０７５７４号公報、同４−１２２８６２〜５号公報、特開平１１−９４０８８号公報に記載されたものが知られている。これら各公報に記載された従来技術のうち、実開平４−８８５０５号公報に記載されたものは、上記図７に示した従来技術と同様の問題がある。又、実開平４−１０７５７４号公報、同４−１２２８６２〜５号公報、特開平１１−９４０８８号公報に記載されたものは、特殊形状の位置決めピンが必要でその分コストが嵩んだり、位置決めは図れても脱落防止が不完全であったり、位置決めの為の係止部が互いに突き当てる面と干渉してシール性が不十分になる可能性がある為、その為の対策が必要になる等の問題がある。
本発明のメタルガスケットは、この様な不都合を何れも解消すべく発明したものである。
【０００７】
【課題を解決するための手段】
本発明のメタルガスケットは、前述した従来から知られているメタルガスケットと同様に、弾性を有する金属板の中央部に流体を通過させる為の透孔を、この透孔を挟む２個所位置にそれぞれ、スタッド或はロケートピン等の杆状部材を挿通する為の１対の通孔を、それぞれ形成している。
特に、本発明のメタルガスケットに於いては、上記金属板の一部でこれら両通孔の中心よりも上記透孔に寄った部分を同方向に折り曲げている。そして、上記金属板の自由状態での上記両通孔の反対側縁同士の距離を、これら両通孔に挿通すべき１対の杆状部材の反対側面同士の距離よりも小さくしている。
【０００８】
【作用】
上述の様に構成する本発明のメタルガスケットは、１対の通孔のピッチが、金属板を平坦にする方向に弾性変形させた状態で、１対の杆状部材のピッチと実質的に一致する。これに対して、上記金属板の自由状態では、上記１対の通孔のピッチが、上記１対の杆状部材のピッチよりも短くなる。そこで、上記金属板を弾性変形させて上記１対の通孔のピッチを大きくした状態でこれら各通孔内に上記杆状部材を挿通した後、上記金属板に加えていた力を解除すれば、上記１対の通孔の反対側縁が上記１対の杆状部材の反対側面に弾性的に当接する。この結果、上記メタルガスケットが、これら両杆状部材から不用意に脱落する事がなくなる。又、従来構造にあった係止片の様な突出部がない為、複数枚のメタルガスケットを重ね合わせ易く、且つ、他のメタルガスケットを傷付けにくいので、搬送作業の能率向上を図れる。
【０００９】
【発明の実施の形態】
図１は、本発明の実施の形態の第１例を示している。本例は、排気管１１の端部（エキゾーストマニホールドの下流端や排気浄化器、消音器の端部を含む）に固設したフランジ１２と相手フランジとの間の気密保持を図る為のメタルガスケット６ａに関する。このフランジ１２には、杆状部材であり互いに平行に配置された１対のスタッド１３、１３の基端部（図１の上端部）を結合固定している。上記メタルガスケット６ａは、ステンレスのばね鋼板等の弾性を有する金属板の中央部に排気を通過させる為の透孔７ａを、この透孔７ａを挟む２個所位置にそれぞれ上記１対のスタッド１３、１３を挿通する為の１対の通孔８ａ、８ａを、それぞれ形成している。
【００１０】
上記金属板の一部で上記両通孔８ａ、８ａよりも上記透孔７ａに寄った部分を、同方向（図１の上方）に少し（例えば１０〜３０度程度）折り曲げて、１対の折り曲げ部１４、１４を形成している。そして、上記金属板の自由状態、即ち図１に鎖線で示した状態での上記両通孔８ａ、８ａの反対側縁同士の距離Ｌ₈ を、これら両通孔８ａ、８ａに挿通すべき上記１対のスタッド１３、１３の反対側面同士の距離Ｌ₁₃よりも小さく（Ｌ₈ ＜Ｌ₁₃）している。但し、上記金属板を弾性変形させ、上記各折り曲げ部１４、１４を平坦にした状態では、上記１対の通孔８ａ、８ａのピッチが上記１対のスタッド１３、１３のピッチと実質的に一致し、上記両通孔８ａ、８ａの反対側縁同士の距離Ｌ₈ ´が、上記１対のスタッド１３、１３の反対側面同士の距離Ｌ₁₃よりも大きく（Ｌ₈ ´＞Ｌ₁₃）なる様に、各部の寸法を規制している。
【００１１】
上述の様に構成する本例のメタルガスケット６ａは、上記各折り曲げ部１４、１４を押し潰し（或は引き伸ばし）た状態で、上記１対のスタッド１３、１３同士の間に装着する。この状態では、上記１対の通孔８ａ、８ａのピッチがこれら１対のスタッド１３、１３のピッチと実質的に一致する為、これら各スタッド１３、１３を上記各通孔８ａ、８ａ内に挿通できる。これに対して、上記金属板の自由状態では、これら１対の通孔８ａ、８ａのピッチが、上記１対のスタッド１３、１３のピッチよりも短くなる。そこで、上記金属板を上記折り曲げ部１４、１４が平坦になる方向に弾性変形させる事により上記１対の通孔８ａ、８ａのピッチを大きくした状態で、これら各通孔８ａ、８ａ内に上記１対のスタッド１３、１３を挿通した後、上記金属板に加えていた力を解除すれば、上記１対の通孔８ａ、８ａの反対側縁が上記１対のスタッド１３、１３の反対側面に弾性的に当接する。この結果、上記メタルガスケット６ａが、これら両スタッド１３、１３の間に係止されて、不用意に脱落する事がなくなる。又、上記メタルガスケット６ａを形成する為の金属板に無駄が生じにくく、材料の有効利用（歩留向上）による低コスト化を図れる。更に、上記各通孔８ａ、８ａ内に上記１対のスタッド１３、１３を挿通する作業は容易に行なえる為、排気系を構成する部材同士の接続作業を容易に行なえる。
【００１２】
次に、図２〜３は、本発明の実施の形態の第２例を示している。本例のメタルガスケット６ｂの場合には、透孔７ａの周囲に閉鎖環状の突条１５を形成している。この突条１５は、台形（円弧形でも良い）の断面形状を有し、厚さ方向の力により弾性的に圧縮される。この様な突条１５を形成した本例のメタルガスケット６ｂは、互いに突き合わせる１対の面同士の間で上記突条１５を弾性的に圧縮し、当該部分の面圧を全周に亙って高くする事により、シール性の向上を図れる。その他の部分の構成及び作用は、上述した第１例の場合と同様であるから、同等部分には同一符号を付して重複する説明は省略する。
【００１３】
次に、図４〜５は、本発明の実施の形態の第３例を示している。本例の場合には、メタルガスケット６ｃを構成する金属板の一部で各通孔８ａ、８ａをそれぞれ挟む部分に、折り曲げ部１４ａ、１４ａと第二の折り曲げ部１６、１６とを形成している。即ち、上記各通孔８ａ、８ａの互いに近い側の端縁部分に互いに同方向に折れ曲がった上記各折り曲げ部１４ａ、１４ａを形成している。これに対して、上記各通孔８ａ、８ａの互いに遠い側の端縁部分に互いに同方向に、上記折り曲げ部１４ａ、１４ａとは逆方向に同じ角度だけ折れ曲がった、上記各第二の折り曲げ部１６、１６を形成している。従って、本例のメタルガスケット６ｃの場合には、上記各通孔８ａ、８ａを形成した部分が傾斜部となり、その両側に存在する平坦部を連続させた形状を有する。この様な形状のメタルガスケット６ｃの場合も、上記１対の通孔に挿通したスタッド１３、１３（図１参照）に対し、容易に仮固定できる。又、本例の場合には、２個所の折り曲げ部を有する形状に加工する為、加工時に形状を整え易くなり、上記傾斜部の傾斜角度の調整をより細かく行なう事ができる。しかも、この傾斜部の両側に存在する両平坦部同士の間の差（高さ）も適宜変える事ができる為、接続部の状況に応じて、脱洛阻止の為の構造部分の形状をより細かく調整できる。
【００１４】
尚、本発明のメタルガスケットは、組み付け作業時に脱落する可能性がある接続部に使用するものであれば、排気系に組み込むガスケットに限らず、他の種々の接続部に使用できる。又、流体を通す為の透孔とスタッド等の杆状部材を挿通する為の１対の通孔とを備えているメタルガスケットであれば、他の部分に別の孔が設けられた構造にも適用可能な場合もある。
【００１５】
【発明の効果】
本発明は、以上に述べた通り構成され作用するので、例えば排気系を構成する部材同士の結合作業を容易に行なえる、安価なメタルガスケットを得られる。
【図面の簡単な説明】
【図１】本発明の実施の形態の第１例を示す断面図。
【図２】同第２例を示す正面図。
【図３】図２のＡ−Ａ断面図。
【図４】本発明の実施の形態の第３例を示す正面図。
【図５】図４のＢ−Ｂ断面図。
【図６】エキゾーストマニホールドの１例を示す斜視図。
【図７】従来のメタルガスケットの１例を示す斜視図。
【符号の説明】
１エキゾーストマニホールド
２分岐管部
３合流管部
４上流端フランジ
５下流端フランジ
６、６ａ、６ｂ、６ｃメタルガスケット
７、７ａ透孔
８、８ａ通孔
９係止片
１０通孔
１１排気管
１２フランジ
１３スタッド
１４、１４ａ折り曲げ部
１５突条
１６第二の折り曲げ部[0001]
BACKGROUND OF THE INVENTION
The metal gasket according to the present invention is, for example, incorporated in an exhaust system of an automobile traveling engine to form an exhaust system so as to maintain an airtightness between the butted surfaces of a pair of members coupled to each other. Used in a state of being sandwiched between the butted surfaces.
[0002]
[Prior art]
Exhaust gas discharged from the cylinder head of the engine is released into the atmosphere through an exhaust system provided with an exhaust purifier and a silencer on the way. Since such an exhaust system is configured by connecting a plurality of members including the exhaust purifier and the silencer in series with respect to the flow direction of the exhaust, it is necessary to keep the connection portion airtight. In addition, this airtight structure needs to have sufficient heat resistance in consideration of the circulation of high-temperature exhaust. Further, the connection work is often performed in a limited space under the floor of the automobile, and the mating surface to which the airtight holding member is assembled is often inclined or downward. Even if the connecting portion is facing upward, in the case of a flow work or the like, it may move during the assembly, and the airtight holding member may move due to vibration at that time. In consideration of these matters, conventionally, a metal gasket made of a metal plate is assembled to the connecting portion, and a structure that prevents the metal gasket from falling off during connection work has been employed.
[0003]
As an example of such a conventional structure, the structure described in Japanese Utility Model Laid-Open No. 4-68249 is shown in FIGS. This conventional structure relates to a portion that connects an upstream end portion of an exhaust manifold 1 as shown in FIG. 6 to a side surface of an engine cylinder block (not shown). The exhaust manifold 1 has one merging pipe section at the downstream end of a plurality of (four in the illustrated example) branch pipe sections 2 and 2 provided in accordance with the number of exhaust ports opened on the side surface of the cylinder block. 3 is provided. Upstream end flanges 4, 4 are provided at the upstream end portions of the branch pipe portions 2, 2, and downstream end flanges 5 are provided at the downstream end of the junction tube portion 3. Of these, the upstream end flanges 4 and 4 are connected to the side surface of the cylinder block via a metal gasket 6 as shown in FIG. 7, and the downstream end flange 5 is not shown via a metal gasket (not shown). Connect the upstream end of the exhaust pipe.
[0004]
The metal gasket 6 is formed by forming a metal plate having elasticity into a rhombus according to the shape of the upstream end flange 4, and a through hole 7 for passing exhaust gas through the center is sandwiched between 2 A pair of through-holes 8 and 8 for inserting studs, which are hook-shaped members, are provided at the respective positions. A pair of locking pieces 9 are provided on the opposite edge of the metal gasket 6. In such a state that the metal gasket 6 is overlapped with the upstream end flange 4, the peripheral edge portion of the upstream end flange 4 is held by the pair of locking pieces 9, 9, and temporarily fixed to the upstream end flange 4. To do. Then, a pair of studs projecting at positions where the exhaust port is sandwiched between the side surfaces of the cylinder block are inserted into the through holes 8, 8 and the through holes 10, 10 formed in the upstream end flange 4. A nut is screwed into a portion protruding from the upstream end flange 4 at the tip end portion of the stud and further tightened. By this operation, the side surface of the cylinder block and the upstream end flange 4 are coupled via the metal gasket 6.
[0005]
[Problems to be solved by the invention]
Since the metal gasket 6 as shown in FIG. 7 can be temporarily fixed to a predetermined portion of the upstream end flange 4 when the exhaust manifold 1 and the cylinder block are joined, the joining work can be facilitated. However, since the locking pieces 9 and 9 are provided, not only the yield of the material is deteriorated and the manufacturing cost is increased, but also the operation of pushing the upstream end flange 4 between the locking pieces 9 and 9 is troublesome. However, it is not always possible to sufficiently improve the efficiency of the above-described joining work. In addition, since each of the locking pieces 9 and 9 is provided, the metal gasket 6 as a product is not easily overlapped and bulky when transported together, and the ends of the locking pieces 9 and 9 are not bulky. Care must be taken not to damage the metal gasket 6. For this reason, there is a problem that the efficiency of the conveyance work is reduced.
[0006]
Other techniques for temporarily fixing the metal gasket to the mounting portion include Japanese Utility Model Laid-Open Nos. 4-88505, 4-107574, 4-122862-5, and Japanese Patent Laid-Open No. 11-94088. Those described in (1) are known. Among the prior arts described in these publications, the one described in Japanese Utility Model Publication No. 4-88505 has the same problem as the prior art shown in FIG. In addition, those described in Japanese Utility Model Laid-Open Nos. 4-107574, 4-122862-5, and Japanese Patent Laid-Open No. 11-94088 require a specially-shaped positioning pin, which increases the cost. However, the prevention of dropout may be incomplete, or the locking parts for positioning may interfere with the surfaces that abut each other, resulting in insufficient sealing performance. There are problems such as.
The metal gasket of the present invention has been invented to eliminate all of these disadvantages.
[0007]
[Means for Solving the Problems]
In the metal gasket of the present invention, similarly to the previously known metal gaskets, the through holes for allowing fluid to pass through the central portion of the elastic metal plate are respectively located at two positions sandwiching the through holes. In addition, a pair of through holes for inserting a stud-like member such as a stud or a locating pin are formed.
In particular, in the metal gasket of the present invention, a part of the metal plate that is closer to the through hole than the center of both through holes is bent in the same direction. And the distance of the opposite side edge of the said both through-holes in the free state of the said metal plate is made smaller than the distance of the opposite side surfaces of a pair of bowl-shaped members which should be inserted in these both through-holes.
[0008]
[Action]
The metal gasket of the present invention configured as described above substantially matches the pitch of the pair of hook-shaped members in a state where the pitch of the pair of through holes is elastically deformed in the direction of flattening the metal plate. To do. On the other hand, in the free state of the metal plate, the pitch of the pair of through holes is shorter than the pitch of the pair of bowl-shaped members. Therefore, after the metal plate is elastically deformed and the pitch of the pair of through holes is increased, the hook-like member is inserted into each of the through holes, and then the force applied to the metal plate is released. The opposite side edges of the pair of through holes elastically contact the opposite side surfaces of the pair of hook-shaped members. As a result, the metal gasket is not accidentally dropped from these two hook-shaped members. In addition, since there is no protruding portion like a locking piece in the conventional structure, a plurality of metal gaskets can be easily stacked and other metal gaskets are not easily damaged, so that the efficiency of the conveyance work can be improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a first example of an embodiment of the present invention. This example is a metal gasket for maintaining an airtightness between the flange 12 fixed to the end of the exhaust pipe 11 (including the downstream end of the exhaust manifold, the exhaust purifier, and the end of the silencer) and the mating flange. Regarding 6a. To the flange 12, a base end portion (upper end portion in FIG. 1) of a pair of studs 13 and 13 which are hook-shaped members and are arranged in parallel to each other is fixedly coupled. The metal gasket 6a has a through hole 7a for allowing exhaust to pass through a central portion of an elastic metal plate such as a stainless spring steel plate, and the pair of studs 13 at two positions sandwiching the through hole 7a, respectively. A pair of through-holes 8a and 8a for inserting 13 is formed.
[0010]
A portion of the metal plate that is closer to the through hole 7a than the two through holes 8a, 8a is bent slightly in the same direction (upward in FIG. 1) (for example, about 10 to 30 degrees) to form a pair of Bending portions 14 and 14 are formed. The distance L ₈ between the opposite edges of the through holes 8a, 8a in the free state of the metal plate, that is, in the state shown by the chain line in FIG. 1, is to be inserted into the through holes 8a, 8a. The distance between the opposite side surfaces of the pair of studs 13 and ₁₃ is smaller than the distance L ₁₃ (L ₈ <L ₁₃ ). However, in a state where the metal plate is elastically deformed and the bent portions 14 and 14 are flattened, the pitch of the pair of through holes 8a and 8a is substantially equal to the pitch of the pair of studs 13 and 13. The distance L ₈ ′ between the opposite side edges of the through holes 8 a, 8 a is greater than the distance L ₁₃ between the opposite side surfaces of the pair of studs 13, ₁₃ (L ₈ ′> L ₁₃ ). Similarly, the dimensions of each part are regulated.
[0011]
The metal gasket 6a of this example configured as described above is mounted between the pair of studs 13 and 13 in a state where the bent portions 14 and 14 are crushed (or stretched). In this state, since the pitch of the pair of through holes 8a, 8a substantially matches the pitch of the pair of studs 13, 13, the studs 13, 13 are placed in the through holes 8a, 8a. Can be inserted. On the other hand, in the free state of the metal plate, the pitch of the pair of through holes 8a, 8a is shorter than the pitch of the pair of studs 13, 13. Therefore, the metal plate is elastically deformed in the direction in which the bent portions 14 and 14 become flat to increase the pitch of the pair of through-holes 8a and 8a, and the above-mentioned inside of each through-hole 8a and 8a If the force applied to the metal plate is released after inserting the pair of studs 13 and 13, the opposite side edge of the pair of through holes 8a and 8a is the opposite side surface of the pair of studs 13 and 13. Elastically abuts. As a result, the metal gasket 6a is locked between the studs 13 and 13, so that the metal gasket 6a is not accidentally dropped. In addition, the metal plate for forming the metal gasket 6a is less likely to be wasted, and the cost can be reduced by effectively using the material (improving the yield). Further, since the work of inserting the pair of studs 13 and 13 into the through holes 8a and 8a can be easily performed, the work of connecting members constituting the exhaust system can be easily performed.
[0012]
Next, FIGS. 2 to 3 show a second example of the embodiment of the present invention. In the case of the metal gasket 6b of this example, a closed annular protrusion 15 is formed around the through hole 7a. The ridge 15 has a trapezoidal (or arc-shaped) cross-sectional shape and is elastically compressed by a force in the thickness direction. The metal gasket 6b of this example in which such ridges 15 are formed compresses the ridges 15 elastically between a pair of surfaces to be abutted with each other, and the surface pressure of the portions is spread over the entire circumference. Therefore, it is possible to improve the sealing performance. Since the configuration and operation of the other parts are the same as in the case of the first example described above, the same parts are denoted by the same reference numerals, and redundant description is omitted.
[0013]
4 to 5 show a third example of the embodiment of the present invention. In the case of this example, the bent portions 14a and 14a and the second bent portions 16 and 16 are formed at portions where the through holes 8a and 8a are sandwiched by a part of the metal plate constituting the metal gasket 6c. Yes. That is, the bent portions 14a and 14a that are bent in the same direction are formed at edge portions of the through holes 8a and 8a that are close to each other. On the other hand, each said 2nd bending part bent by the same angle in the opposite direction to the said bending parts 14a and 14a at the edge part of the far side of each said through-hole 8a and 8a mutually. 16 and 16 are formed. Therefore, in the case of the metal gasket 6c of the present example, the portion where the through holes 8a and 8a are formed becomes an inclined portion and has a shape in which flat portions existing on both sides thereof are continuous. Also in the case of the metal gasket 6c having such a shape, it can be easily temporarily fixed to the studs 13 and 13 (see FIG. 1) inserted into the pair of through holes. Further, in the case of this example, since it is processed into a shape having two bent portions, the shape can be easily adjusted during processing, and the inclination angle of the inclined portion can be adjusted more finely. In addition, since the difference (height) between the two flat portions existing on both sides of the inclined portion can be changed as appropriate, the shape of the structural portion for preventing defatting is further increased depending on the situation of the connecting portion. Can be finely adjusted.
[0014]
The metal gasket of the present invention can be used not only for the gasket incorporated in the exhaust system but also for other various connection parts as long as it is used for the connection part that may fall off during assembly work. In addition, if the metal gasket is provided with a through-hole for passing a fluid and a pair of through-holes for inserting a stud-like member such as a stud, it has a structure in which another hole is provided in another part. May also be applicable.
[0015]
【The invention's effect】
Since the present invention is configured and operates as described above, it is possible to obtain an inexpensive metal gasket that can easily perform, for example, a joining operation of members constituting the exhaust system.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first example of an embodiment of the present invention.
FIG. 2 is a front view showing the second example.
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a front view showing a third example of the embodiment of the present invention.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a perspective view showing an example of an exhaust manifold.
FIG. 7 is a perspective view showing an example of a conventional metal gasket.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Exhaust manifold 2 Branch pipe part 3 Merge pipe part 4 Upstream end flange 5 Downstream end flange 6, 6a, 6b, 6c Metal gasket 7, 7a Through hole 8, 8a Through hole 9 Locking piece 10 Through hole 11 Exhaust pipe 12 Flange 13 Stud 14, 14 a Bending part 15 Projection 16 Second bending part

Claims

The metal gasket formed with a pair of through holes for allowing fluid to pass through the central part of the elastic metal plate and a pair of through holes for inserting the hook-like members at two positions sandwiching the through holes, respectively. In this case, by bending a part of the metal plate that is closer to the through hole than the center of the two through holes in the same direction, the opposite edges of the two through holes in the free state of the metal plate The metal gasket is characterized in that the distance is made smaller than the distance between the opposite side surfaces of the pair of eaves-like members to be inserted into the two through holes.