JP4047435B2

JP4047435B2 - Laminated metal gasket

Info

Publication number: JP4047435B2
Application number: JP03630398A
Authority: JP
Inventors: 浩和長谷川
Original assignee: Nippon Reinz Co Ltd
Current assignee: Nippon Reinz Co Ltd
Priority date: 1998-02-18
Filing date: 1998-02-18
Publication date: 2008-02-13
Anticipated expiration: 2018-02-18
Also published as: JPH11230353A

Description

【０００１】
【発明の属する技術分野】
本発明は２個乃至４個の金属板を積層して形成した積層金属ガスケットにおける誤積層検出構造に関するものである。
【０００２】
【従来の技術】
複数枚の構成金属板を互いに重ね合わせて形成した例えばシリンダヘッドガスケット等の積層金属ガスケットにおいては、構成板がほぼ同じような形状を有するのが通常であり、構成板の積層順位を誤って積層する可能性があり、また、各構成板が設計どおりの順序に重ね合わされているか否かを外部から判別するのは困難である。積層金属ガスケットが構成板の積層順序を誤って組立てられているときは、シール性に重大な欠陥を生じる。
【０００３】
上記の問題を解決するために誤積層（組立）を外部から容易に検知できる誤積層判別構造を有する積層金属ガスケットが特開昭６２−１５９８６６号公報及び実開昭６２−１１４２７０号公報に記載されている。上記特開昭６２−１５９８６６号公報に記載された誤積層判別構造は図９及び図１０に示すように、各構成板１１ａ、１１ｂ、１１ｃ及び１１ｄの外周縁もしくは透孔の内周縁のそれぞれ異なる位置に突片１２ａ、１２ｂ、１２ｃもしくは１２ｄを突出させたものである。また上記実開昭６２−１１４２７０号公報に記載された誤積層判別構造は図１１及び図１２に示すように、各構成板１１ａ、１１ｂ、１１ｃ及び１１ｄの外周縁もしくは透孔の内周縁に順次階段状をなす露出部１３ｂ、１３ｃもしくは１３ｄを形成したものである。
【０００４】
【発明が解決しようとする課題】
前記特開昭６２−１５９８６６号公報及び実開昭６２−１１４２７０号公報に記載の誤積層判別構造は積層金属ガスケットにおける誤積層を外部から容易に目視検知することを可能にする。然し、この判別構造のために各構成板の外周縁の形状又は透孔の内周縁形状もしくは内径が各構成板ごとに異なるものとなる。従って、例えばシリンダヘッドガスケットの場合で言えば、金属板から、燃焼室孔、水孔、油孔及びボルト孔等の透孔と外周縁とを打ち抜く抜き型は各構成板ごとに異なる抜き型を用いる必要がある。当然、金属板から打ち抜かれた抜き板も各構成ごとに異なり、共用できない。
【０００５】
本発明は上記の難点を解消するものであり、本発明の目的は２層乃至４層の金属板（構成板）を積層して形成され、誤積層を外部から目視検出できる誤積層検知手段を備える積層金属ガスケットにおいて、少なくとも一部の構成板について抜き型を共用することを可能とし、また抜き板を少なくとも一部の構成板に共通に用いることを可能にする新規な誤積層検出構造を提供することにある。
【０００６】
【課題を解決するための手段】
上記目的を達成する本発明においては、２層乃至４層の積層金属板を構成する構成金属板がそれぞれ下記のとおりに形成されている。すなわち、ガスケットの外面側に配置され、その一方の表面が例えばシリンダヘッドやシリンダブロックの接合面に当接する外側表面となる構成板である上下２層の表面板は、互いに同一の外周縁形状を有し、少なくともその外側表面にふっ素ゴム等のシール材をコーティングしたシール材層を備えるとともに、外側表面のみに文字、記号及び図形等からなる表面板誤積層検出マークを有する。また、各表面板は該誤積層検出マークの近傍の外周縁に、積層されたときに下層板を露出させることができる凹入部を備えている。
【０００７】
本発明による３層及び４層の積層金属ガスケットにおいては、上記の上下２層の表面間の間に第１中間板が配設され（３層の場合）、又は第１中間板と第２中間板とが配設される（４層の場合）。この第１中間板及び第２中間板はともに表面板の前記凹入部に対応する位置に凹入部を備えていない。そして、第１中間板はその両表面ともにシール材層を備えていない。
【０００８】
第２中間板は第１中間板に当接する側の表面にシール材層を有するとともに表面板の凹入部に対応する位置に文字、記号、図形等からなる中間板誤積層検出マークを有し、表面板に当接する反対側の表面にはシール材層を備えていない。本発明による２層乃至４層の積層金属ガスケットは上記説明した上下２層の表面板並びに第１及び第２の中間板を重ね合わせて積層形成される。
【０００９】
上記の本発明による積層金属ガスケットにおける各構成板の積層順序の誤りは、ガスケットの外側に現れた表面におけるシール材層の有無、及び表面板誤積層検出マークの表示の有無、並びに凹入部の下層に露出している中間板における中間板誤積層検出マークの表示の有無に基づいて目視により容易に検出できる。構成板の何れかが欠けている欠板の場合は、積層ガスケットの重量計測において検出されるが、本発明によれば、この欠板も殆どの場合、積層順位の誤りと同様に目視により容易に検出できる。上下２層の表面板を誤ってともに上層もしくは下層表面板用の構成板により組立てたような誤積層の場合も同様である。これらの誤積層の検出の詳細については「発明の実施の形態」の欄において説明する。
【００１０】
上下２層の表面板においては、例えばシリンダヘッドガスケットの場合、燃焼室孔、水孔、油孔及びボルト孔等の透孔の位置、形状、大きさは同一に形成されるのが通常であり、また板厚も通常同一であるから、本発明におけるように上下２層の表面板の外周縁形状が同一である場合は、上下２層の表面板を同一の金型を用いて素材金属板から打ち抜くことができ、抜き型が共用できる。また、素材金属板から打ち抜かれた抜き板は上下２層の表面板の何れにも加工でき、抜き板を共用できる。
【００１１】
中間板も、第１中間板と第２中間板とにおいて透孔の位置、形状、大きさが同一であるのが通常であるから、第１中間板と第２中間板とが同一の外周形状を有するように形成する場合は、第１中間板と第２中間板とを同一の抜き型により形成することができ、抜き型を共用できる。抜き型の共用は上記した上下２層の表面板における共用、第１及び第２中間板における共用だけでなく、更に共用を広げることもでき、その詳細は次の欄において説明する。
【００１２】
【発明の実施の形態】
本発明の詳細並びに実施の形態を図面に基づき以下に説明する。図１乃至図４は２層の構成金属板からなる本発明の第１実施形態の積層金属ガスケットであるシリンダヘッドガスケットを示す。図１はその平面図であり、図２はその要部（誤積層検出手段）の拡大斜視図であり、図３は該要部の分解斜視図である。図４は、図３とは反対側すなわち裏側からみた要部の分解斜視図である。ただし、図面を簡単化し、わかり易くするために、水孔、油孔等の図示を省略し、またビードの図示をも省略している。図５以下の図面においても同様である。
【００１３】
図において、シリンダヘッドガスケットＧ１はステンレス鋼板等の弾性金属板からなる上下２層の表面板１ａ及び１ｄを重ね合わせて形成されている。表面板１ａ及び１ｄはそれぞれ燃焼室孔２、ボルト孔３及び図示を省略した水孔、油孔等の透孔を備えており、これらの透孔は表面板１ａ及び１ｄにおいて同一の位置に、同一の形状、同一の大きさに形成されている。また、表面板１ａ及び１ｄは外周縁の形状も同一であり、下縁の右隅部近くの同一位置に同一形状、同一大きさの凹入部４を備えている。
【００１４】
表面板１ａ及び１ｄはそれぞれ燃焼室孔２の周りにこれを囲繞する凸状ビード（図示せず）を備えるが、該ビードはそれぞれガスケットの外側に向かって突起するように、すなわち表面板１ａの外側表面１ａ−１及び表面板１ｄの外側表面１ｄ−２が当接するシリンダヘッド及びシリンダブロックの接合面に向かって突起するように形成されている。そして表面板１ａ及び１ｄの外側表面１ａ−１及び１ｄ−２並びに内側表面１ａ−２及び１ｄ−１の何れか一方又は双方（図では内側表面１ｄ−１）に前記凸状ビードの幅よりも広い適宜な幅にわたって被覆されたふっ素ゴム等のシール材層５が施されている。このシール材層５は図示しない水孔、油孔等の周りの段差ビード上にも施されている。シール材層は外側表面もしくは内側表面の全面に設けることもできる。
【００１５】
表面板１ａの外表面１ａ−１の凹入部４の側方には文字Ｈからなる表面板誤積層検出マーク６が設けられ、また表面板１ｄの外表面１ｄ−２の凹入部４の側方には文字Ｂからなる表面板誤積層検出マーク６（図４）が設けられている。この表面板誤積層検出マーク６は文字Ｈ、Ｂに限られず、一般的には、種々の文字、記号、図形を用いることができ、図形の場合には、例えば、シール材層５の目につき易いダミー分岐であってもよい。また、外表面１ａ−１及び１ｄ−２上のマーク６は同一形状のマークであってもよい。マーク６はシール材層５と同時に或は別途にスクリーン印刷により設けてもよいし、或はスタンプによる印色、刻印等により設けてもよい。凹入部４及びマーク６はガスケットのシール性に影響しない位置に設けられている。
【００１６】
上記のとおり構成されたシリンダヘッドＧ１の組立に当たって積層順序を誤って表面板１ａと１ｄとが逆の順序に積層された場合は、表面板誤積層検出マーク６を備えない表面１ｄ−１と１ａ−２とがガスケットの外表面になるので、ガスケットＧ１の双方の外表面から表面板誤積層検出マークが消え、これによって誤積層を外部から容易に検出することができる。表面板１ａの内表面１ａ−２がシール材層を備えていないときは、積層順序に誤りがあれば、シール材層を有しない表面がガスケットの外表面に現れることによっても誤積層であることが一目瞭然である。
【００１７】
シール材層は一般に黒色であり、ステンレス鋼板等の金属光沢がある白色の金属板表面とは一般に色相、彩度及び明度が異なり、しかも表面の比較的広い範囲にコーティングされているので、シール材層の有り、無しは一目瞭然である。誤って一方の表面板１ａだけを２層積層した場合、又は一方の表面板例えば１ｄが欠板となっている場合には、ガスケットの外側表面の一方において表面板誤積層検出マークが消え、又はこれに加えてシール材層を有しない表面が現れるので、誤積層を外部から容易に検出することができる。
【００１８】
また、上下２層の表面板１ａと１ｄとは、前記したとおり、透孔の位置、形状及び大きさが同一であり、外周縁形状も同一であり、更に板厚も同じであるから、素材金属板から表面板１ａ及び１ｄ用の金属板を打ち抜くに当たっては同一の抜き型を用いることができる。また、抜き板は表面板１ａ用にも、１ｄ用にも用いることができる。なお、ガスケットＧ１においては凹入部４は誤積層の検出に関与しない。従って次に述べる変形例におけるように省略することもできるが、第１実施形態のガスケットＧ１においても凹入部４を設けることによって後記の３層構成及び４層構成の積層金属ガスケットにおける表面板と外周縁形状を一致させ、抜き型及び抜き板を共用できる利点があり、また表面板誤積層検出マークの存在位置を明示し強調する効果がある。
【００１９】
図５は前記の第１実施形態の変形例のガスケットＧ１′の要部の斜視図である。ガスケットＧ１′を形成する上下２層の表面板１ａ′及び１ｄ′はともに凹入部を備えていない。この点以外は、ガスケットＧ１′は前記ガスケットＧ１と同様であり、表面板１ａ′と１ｄ′とは外周縁形状を同じくしている。従って、表面板１ａ′及び１ｄ′は抜き型及び抜き板を共用することができる。誤積層検出は前記した第１実施形態のガスケットＧ１と全く同様に行うことができる。
【００２０】
図６は本発明の第２実施形態の積層ガスケットであるシリンダヘッドガスケットＧ２の要部の分解斜視図である。ガスケットＧ２は上下２層の表面板１ａ及び１ｄ並びにこれら表面板１ａ及び１ｄの間に挟まれるように配置された第１中間板１ｂを積層してなるものである。表面板１ａ及び１ｄは前記の第１実施形態のガスケットＧ１における表面板１ａ及び１ｄと同様であり、従ってこれらと共用することもできる。ただし、ガスケットＧ２における表面板１ａ及び１ｄはそれぞれ両側の表面にシール材層５が被覆されている。
【００２１】
第１中間板１ｂはステンレス鋼板等の金属板からなり、外周縁には表面板１ａ及び１ｄの凹入部４に対応する凹入部を備えておらず、また両側表面ともにシール材層５が被覆されていない。従って、表面板１ａ、第１中間板１ｃ、表面板１ｄの順に積層されたとき、表面板１ａ及び１ｄの凹入部４において第１中間板１ｂの表面１ｂ−１の一部が露出する。
【００２２】
ガスケットＧ２は上記の構成を有するので、構成板の積層順序を誤り、表面板１ａと第１中間板１ｂとが入れ換っている場合、或は表面板１ｄと第１中間板１ｂとが入れ換っている場合は、ガスケットＧ２の一方の外表面においては表面板誤積層検出マーク６が消え、加えて第１中間板のシール材層を有しない表面１ｂ−１もしくはその裏面が露出するので、誤積層が一目瞭然である。また、表面板１ａと１ｄとが入れ換っている場合は、ガスケットＧ２の両方の外表面においてマーク６が消えるので、入れ換りを容易に検出できる。従って、積層順位の誤りを全て外部から容易に検出できる。
【００２３】
表面板１ａ又は１ｄが欠けているときは、ガスケットＧ２の外表面にシール材層を有しない第１中間板の表面が表れるので一目瞭然であり、また、第１中間板１ｂが欠けているときは、凹入部４に露出している表面が消えて終うことにより容易に検出できる。更に、誤って表面板１ａもしくは１ｄを２層重ね第１中間板を欠いている場合も、凹入部４に露出している表面が消えて終うことにより検出でき、第１中間板を２層重ね表面板１ａもしくは１ｄを欠いているときは、シール材層を有しない表面がガスケットＧ２の外表面として現れるので、一目瞭然である。
【００２４】
ガスケットＧ２においては、第１中間板１ｂはその外周縁形状が表面板１ａ及び１ｄの外周縁形状と異なるので、金属板素材から第１中間板用の金属板を打ち抜くには別な抜き型を必要とする。表面板１ａと１ｄとはガスケットＧ１におけると同様に同一の抜き型を共用でき、また抜き板は表面板１ａ用にも表面板１ｄ用にも共用できる。
【００２５】
図７はガスケットＧ２の変形例のガスケットＧ２′の要部の斜視図である。ガスケットＧ２においては構成板の積層順序の誤りの検出には凹入部４は利用されていない。凹入部４が利用されたのは第１中間板１ｂの欠板の検出と、表面板１ａもしくは１ｄが２層積層され第１中間板１ｂが欠けている場合の検出とである。通常、表面板と第１中間板とは重量が異なるので、上記の積層の誤りの検出はガスケットの重量計量においても検出することができる。
【００２６】
従って、ガスケットＧ２′においては表面板１ａ′及び１ｄ′が凹入部を備えず、第１中間板１ｂと同じ外周縁形状に形成されている。ガスケットＧ２′においても、積層順序を誤った誤積層の検出と、前記以外の欠板の検出と、第１中間板を２層積層した場合の検出とはガスケットＧ２におけると同様に行なうことができる。そして、表面板と中間板とにおいて透孔の位置、形状、大きさは共通することが多いので、その場合は表面板１ａ′及び１ｄ′並びに第１中間板において抜き型を共用することができる。
【００２７】
図８は本発明の第３の実施形態の積層金属ガスケットであるシリンダヘッドガスケットＧ３の要部の分解斜視図である。上下２層の表面板１ａ及び１ｄは前記のガスケットＧ１及びガスケットＧ２における表面板１ａ及び１ｄと同様である。表面板１ａの下層の第１中間板１ｂは前記のガスケットＧ２における第１中間板と同様である。ガスケットＧ３においては、第１中間板１ｂと表面板１ｄとの間に第２中間板１ｃが配設されている。
【００２８】
第２中間板１ｃはステンレス鋼板等の金属板からなり、第１中間板と同一の外周縁形状を有し、表面板１ａ及び１ｄの凹入部に対応する凹入部を備えていない。第２中間板１ｃは第１中間板１ｂと当接する側の表面１ｃ−１にシール材層５を備えるとともに表面板１ａの凹入部４に対応する位置に文字、記号及び図形からなる中間板誤積層検出マーク７を有している。表面１ｃ−１の背面である、表面板１ｄに当接する側の表面にはシール材層５もマーク７も存在しない。表面板誤積層検出マーク６はガスケットＧ１及びガスケットＧ２と同様に、ガスケットの外表面すなわち表面板１ａの外側表面１ａ−１と表面板１ｄの外側表面のみに設けられている。
【００２９】
上記の構成を有するガスケットＧ３においては構成板の積層順序の誤りが表１に示すように外部から容易に検出できる。なお、表１において、▲１▼は表面板１ａを、▲２▼は第１中間板１ｂを、▲３▼は第２中間板１ｃを、▲４▼は表面板１ｄを示すものである。また、検出の項中の「外表面」はガスケットの外表面を意味する。
【００３０】
【表１】

【００３１】
各構成板の欠板及び２枚重ねも同様に、シール材層がない面がガスケット外表面に現れる、ガスケット外表面からマーク６が消える、中間板のマーク７が現れる等によって検出できる。ただし、第２中間板の欠板及び第１中間板の２枚重ね（第２中間板が欠ける）の場合についてはガスケットの重量計量において検出される。
【００３２】
ガスケットＧ３においても、ガスケットＧ１及びガスケットＧ２と同様に表面板１ａ及び１ｄの抜き型を共用でき、また抜き板も共用できる。また、ガスケットＧ１、Ｇ２及びＧ３がガスケット厚さが異なるだけで、燃焼室孔、水孔、油孔等の透孔の位置、形状及び大きさが互いに同一であり、外周縁形状も同一であるような場合は表面板１ａ及び１ｄの抜き型及び抜き板はガスケットＧ１、Ｇ２及びＧ３相互間においても共用することができる。第１中間板１ｂと第２中間板１ｃとは通常透孔の位置、形状、大きさが同一であるので、抜き型を共用することができる。
【００３３】
【発明の効果】
上記説明した本発明の積層金属ガスケットにおいては構成板の積層順序の誤り等の誤積層を外部から容易に検出することができる。しかも、従来の誤積層判別構造のように構成板の外周縁形状又は透孔の形状もしくは内径を各構成板ごとに異ならせる必要がなく、構成板の抜き型を共用化することができ、また抜き板を共用化することもできる。従って、本発明によれば抜き型製作費の節減、抜き型交換の段取り時間の減少、抜き板の共用化による仕掛かり品の減少等により積層金属ガスケットのコスト低減にも貢献できる。
【図面の簡単な説明】
【図１】本発明の第１実施形態のシリンダヘッドガスケットの平面図である。
【図２】図１のガスケットの要部の斜視図である。
【図３】図２の要部の分解斜視図である。
【図４】図２の要部を裏側からみた分解斜視図である。
【図５】第１実施形態の変形例の要部の斜視図である。
【図６】本発明の第２実施形態の要部の分解斜視図である。
【図７】第２実施形態の変形例の要部の斜視図である。
【図８】本発明の第３実施形態の分解斜視図である。
【図９】従来の誤積層判別構造の斜視図である。
【図１０】図９の判別構造の変形例の斜視図である。
【図１１】従来の誤積層判別構造の他の例の斜視図である。
【図１２】図１１の判別構造の変形例の斜視図である。
【符号の説明】
１ａ、１ａ′、１ｄ、１ｄ′ 表面板
１ｂ第１中間板
１ｃ第２中間板
４凹入部
５シール材層
６表面板誤積層検出マーク
７中間板誤積層検出マーク[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an erroneous stacking detection structure in a stacked metal gasket formed by stacking two to four metal plates.
[0002]
[Prior art]
In laminated metal gaskets such as cylinder head gaskets that are formed by stacking multiple constituent metal plates on top of each other, the constituent plates usually have substantially the same shape, and the stacking order of the constituent plates is mistakenly stacked. In addition, it is difficult to determine from the outside whether or not the constituent plates are stacked in the designed order. When laminated metal gaskets are assembled incorrectly in the stacking order of the component plates, serious defects in sealability occur.
[0003]
In order to solve the above problems, a laminated metal gasket having a mis-stacking discriminating structure that can easily detect mis-stacking (assembly) from the outside is described in Japanese Patent Application Laid-Open Nos. 62-159866 and 62-114270. ing. As shown in FIGS. 9 and 10, the erroneous stacking discriminating structure described in the above Japanese Patent Application Laid-Open No. 62-159866 has different outer peripheral edges or inner peripheral edges of the through-holes of the respective constituent plates 11a, 11b, 11c and 11d. A protruding

piece

12a, 12b, 12c or 12d is projected at a position. In addition, as shown in FIGS. 11 and 12, the erroneous stacking discriminating structure described in Japanese Utility Model Publication No. 62-114270 is sequentially applied to the outer peripheral edge of each component plate 11a, 11b, 11c and 11d or the inner peripheral edge of the through hole. A stepped exposed

portion

13b, 13c or 13d is formed.
[0004]
[Problems to be solved by the invention]
The erroneous stacking discriminating structure described in Japanese Patent Application Laid-Open No. 62-159866 and Japanese Utility Model Application Laid-Open No. 62-114270 makes it possible to easily visually detect an erroneous stacking in a laminated metal gasket from the outside. However, because of this discriminating structure, the shape of the outer peripheral edge of each component plate or the shape of the inner peripheral edge or inner diameter of the through hole is different for each component plate. Therefore, for example, in the case of a cylinder head gasket, a punching die that punches through holes such as a combustion chamber hole, a water hole, an oil hole, and a bolt hole and an outer peripheral edge from a metal plate is different for each component plate. It is necessary to use it. Naturally, the punched plate punched from the metal plate is different for each configuration and cannot be shared.
[0005]
The present invention solves the above-mentioned difficulties, and an object of the present invention is to provide an erroneous stacking detection means that is formed by laminating two to four layers of metal plates (component plates) and can visually detect misstacking from the outside. Providing a novel misstack detection structure that enables the use of a punching die for at least some of the constituent plates in the laminated metal gasket provided, and allows the punching plate to be used in common for at least some of the constituent plates. There is to do.
[0006]
[Means for Solving the Problems]
In the present invention that achieves the above object, the constituent metal plates constituting the two-layer to four-layer laminated metal plates are respectively formed as follows. That is, the upper and lower two-layer surface plates, which are arranged on the outer surface side of the gasket and whose one surface is an outer surface that comes into contact with the joint surface of the cylinder head or cylinder block, for example, have the same outer peripheral shape. And having a sealing material layer coated with a sealing material such as fluoro rubber at least on the outer surface thereof, and having a surface plate misstacking detection mark made up of characters, symbols, figures and the like only on the outer surface. Each surface plate is provided with a recessed portion on the outer peripheral edge in the vicinity of the erroneous stacking detection mark so that the lower layer plate can be exposed when stacked.
[0007]
In the three-layer and four-layer laminated metal gaskets according to the present invention, the first intermediate plate is disposed between the upper and lower two-layer surfaces (in the case of three layers), or the first intermediate plate and the second intermediate plate. A plate is disposed (in the case of four layers). Both the first intermediate plate and the second intermediate plate have no recessed portion at a position corresponding to the recessed portion of the surface plate. And the 1st intermediate plate is not equipped with the sealing material layer on the both surfaces.
[0008]
The second intermediate plate has a sealing material layer on the surface that comes into contact with the first intermediate plate, and has an intermediate plate erroneous stack detection mark made of characters, symbols, figures, etc. at a position corresponding to the recessed portion of the surface plate, There is no sealing material layer on the surface opposite to the surface plate. The two-layer to four-layer laminated metal gasket according to the present invention is formed by laminating the upper and lower two-layer surface plates and the first and second intermediate plates described above.
[0009]
In the above-described laminated metal gasket according to the present invention, an error in the stacking order of the constituent plates is due to the presence or absence of the sealing material layer on the surface that appears on the outside of the gasket, the presence or absence of the indication of the surface plate misstacking detection mark, It can be easily detected by visual observation based on the presence or absence of display of the intermediate plate mis-stacking detection mark on the intermediate plate exposed to the surface. In the case of a missing plate in which any of the component plates is missing, it is detected in the weight measurement of the laminated gasket. However, according to the present invention, this missing plate is almost always easy to visually check as well as an error in the order of lamination. Can be detected. The same applies to the case of erroneous stacking in which the upper and lower two surface plates are mistakenly assembled by the upper or lower surface plate component plates. Details of detection of these erroneous stacking will be described in the “Embodiments of the Invention” section.
[0010]
In the case of a cylinder head gasket, for example, in the case of a cylinder head gasket, the positions, shapes, and sizes of through holes such as combustion chamber holes, water holes, oil holes and bolt holes are usually formed to be the same. In addition, since the plate thickness is usually the same, when the outer peripheral shape of the upper and lower two-layer surface plates is the same as in the present invention, the upper and lower two-layer surface plates are made of the same metal plate using the same metal mold. Can be punched out and can share a punching die. Moreover, the punched plate punched out from the material metal plate can be processed into any one of the upper and lower surface plates, and the punched plate can be shared.
[0011]
Since the first intermediate plate and the second intermediate plate are usually the same in the position, shape, and size of the through holes, the first intermediate plate and the second intermediate plate have the same outer peripheral shape. When it forms so that it may have, the 1st intermediate board and the 2nd intermediate board can be formed by the same punching die, and a punching die can be shared. The common use of the punching die is not limited to the common use of the upper and lower two-layer surface plates and the common use of the first and second intermediate plates, but can be further expanded. The details will be described in the next section.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Details and embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a cylinder head gasket which is a laminated metal gasket according to a first embodiment of the present invention, which is composed of two layers of metal plates. FIG. 1 is a plan view thereof, FIG. 2 is an enlarged perspective view of the main part (misstacking detecting means), and FIG. 3 is an exploded perspective view of the main part. FIG. 4 is an exploded perspective view of the main part viewed from the side opposite to FIG. 3, that is, from the back side. However, in order to simplify the drawing and make it easy to understand, illustration of water holes, oil holes and the like is omitted, and illustration of beads is also omitted. The same applies to the drawings subsequent to FIG.
[0013]
In the figure, a cylinder head gasket G1 is formed by superposing two upper and lower surface plates 1a and 1d made of an elastic metal plate such as a stainless steel plate. The surface plates 1a and 1d are each provided with a combustion chamber hole 2, a bolt hole 3, and water holes, oil holes and the like which are not shown, and these through holes are located at the same positions on the surface plates 1a and 1d. The same shape and the same size are formed. Further, the surface plates 1a and 1d have the same outer peripheral shape, and are provided with recessed portions 4 having the same shape and the same size at the same position near the right corner of the lower edge.
[0014]
The surface plates 1a and 1d are each provided with a convex bead (not shown) surrounding the combustion chamber hole 2, but the beads protrude respectively toward the outside of the gasket, ie, the surface plate 1a. The outer surface 1a-1 and the outer surface 1d-2 of the surface plate 1d are formed so as to project toward the joining surface of the cylinder head and the cylinder block with which they abut. Then, either one or both of the outer surfaces 1a-1 and 1d-2 and the inner surfaces 1a-2 and 1d-1 (inner surface 1d-1 in the figure) of the surface plates 1a and 1d are larger than the width of the convex bead. A sealing material layer 5 such as fluoro rubber coated over a wide appropriate width is applied. This sealing material layer 5 is also provided on stepped beads around water holes, oil holes, etc. (not shown). The sealing material layer can also be provided on the entire outer surface or inner surface.
[0015]
On the side of the recessed portion 4 of the outer surface 1a-1 of the surface plate 1a, there is provided a surface plate misstacking detection mark 6 consisting of the letter H, and to the side of the recessed portion 4 of the outer surface 1d-2 of the surface plate 1d. Is provided with a surface plate misstacking detection mark 6 (FIG. 4) made of the letter B. The surface plate misstacking detection mark 6 is not limited to the letters H and B, and in general, various letters, symbols, and figures can be used. An easy dummy branch may be used. Further, the marks 6 on the outer surfaces 1a-1 and 1d-2 may be marks having the same shape. The mark 6 may be provided by screen printing at the same time as or separately from the sealing material layer 5, or may be provided by a stamp color, marking, or the like. The recessed portion 4 and the mark 6 are provided at positions that do not affect the sealing performance of the gasket.
[0016]
When the surface plates 1a and 1d are stacked in the reverse order when the cylinder head G1 configured as described above is assembled in the reverse order, the surfaces 1d-1 and 1a that do not have the surface plate erroneous stack detection mark 6 are provided. -2 becomes the outer surface of the gasket, so that the surface plate misstacking detection mark disappears from the outer surfaces of both of the gaskets G1, whereby the misstacking can be easily detected from the outside. When the inner surface 1a-2 of the surface plate 1a is not provided with a sealing material layer, if there is an error in the stacking order, the surface not having the sealing material layer appears on the outer surface of the gasket, resulting in erroneous lamination. Is obvious.
[0017]
The sealing material layer is generally black and generally has a different hue, saturation and brightness from the surface of a white metal plate with a metallic luster such as a stainless steel plate, and is coated over a relatively wide area of the surface. The presence or absence of layers is obvious. If two layers of only one surface plate 1a are mistakenly laminated, or if one surface plate, for example, 1d is a missing plate, the surface plate erroneous lamination detection mark disappears on one of the outer surfaces of the gasket, or In addition to this, since a surface having no sealing material layer appears, it is possible to easily detect misstacking from the outside.
[0018]
Further, as described above, the upper and lower two-layer surface plates 1a and 1d have the same position, shape and size of the through holes, the same outer peripheral shape, and the same plate thickness. The same punching die can be used for punching the metal plates for the surface plates 1a and 1d from the metal plate. Further, the blank plate can be used for both the surface plate 1a and 1d. In addition, in the gasket G1, the recessed part 4 does not participate in the detection of misstacking. Accordingly, it can be omitted as in the modification described below, but by providing the recessed portion 4 also in the gasket G1 of the first embodiment, the surface plate and the outer surface of the laminated metal gasket having the three-layer structure and the four-layer structure described later are provided. There is an advantage that the peripheral shape can be matched, and the punching die and the punching plate can be shared, and there is an effect of clearly indicating and enhancing the position of the surface plate misstacking detection mark.
[0019]
FIG. 5 is a perspective view of an essential part of a gasket G1 ′ according to a modification of the first embodiment. Both the upper and lower surface plates 1a 'and 1d' forming the gasket G1 'are not provided with a recessed portion. Except for this point, the gasket G1 ′ is the same as the gasket G1, and the surface plates 1a ′ and 1d ′ have the same outer peripheral shape. Therefore, the surface plates 1a 'and 1d' can share the punching die and the punching plate. The erroneous stack detection can be performed in the same manner as the gasket G1 of the first embodiment.
[0020]
FIG. 6 is an exploded perspective view of a main part of a cylinder head gasket G2 which is a laminated gasket according to the second embodiment of the present invention. The gasket G2 is formed by laminating two upper and lower surface plates 1a and 1d and a first intermediate plate 1b disposed so as to be sandwiched between the surface plates 1a and 1d. The surface plates 1a and 1d are the same as the surface plates 1a and 1d in the gasket G1 of the first embodiment, and can therefore be shared. However, each of the surface plates 1a and 1d in the gasket G2 is covered with the sealing material layer 5 on both surfaces.
[0021]
The first intermediate plate 1b is made of a metal plate such as a stainless steel plate, and has no recessed portions corresponding to the recessed portions 4 of the surface plates 1a and 1d on the outer peripheral edge, and the sealing material layers 5 are coated on both side surfaces. Not. Therefore, when the surface plate 1a, the first intermediate plate 1c, and the surface plate 1d are laminated in this order, a part of the surface 1b-1 of the first intermediate plate 1b is exposed at the recessed portions 4 of the surface plates 1a and 1d.
[0022]
Since the gasket G2 has the above-described configuration, the stacking order of the component plates is wrong and the surface plate 1a and the first intermediate plate 1b are interchanged, or the surface plate 1d and the first intermediate plate 1b are inserted. In the case of replacement, the front plate erroneous stacking detection mark 6 disappears on one outer surface of the gasket G2, and in addition, the front surface 1b-1 that does not have the sealing material layer of the first intermediate plate or its back surface is exposed. The wrong stacking is obvious. Further, when the surface plates 1a and 1d are interchanged, the mark 6 disappears on both outer surfaces of the gasket G2, so that the interchange can be easily detected. Accordingly, all errors in the stacking order can be easily detected from the outside.
[0023]
When the surface plate 1a or 1d is missing, the surface of the first intermediate plate having no sealing material layer appears on the outer surface of the gasket G2, so that it is obvious. When the first intermediate plate 1b is missing The surface exposed to the recessed portion 4 can be easily detected by ending and disappearing. Furthermore, even when two layers of the surface plates 1a or 1d are mistakenly stacked and the first intermediate plate is lacking, it can be detected by the disappearance of the surface exposed to the recessed portion 4, and the first intermediate plate is divided into two layers. When the overlapped surface plate 1a or 1d is lacking, the surface without the sealing material layer appears as the outer surface of the gasket G2, so that it is obvious.
[0024]
In the gasket G2, since the outer peripheral edge shape of the first intermediate plate 1b is different from the outer peripheral edge shape of the surface plates 1a and 1d, another punching die is used for punching the metal plate for the first intermediate plate from the metal plate material. I need. The surface plates 1a and 1d can share the same punching die as in the gasket G1, and the punching plate can be used for both the surface plate 1a and the surface plate 1d.
[0025]
FIG. 7 is a perspective view of a main part of a gasket G2 ′ as a modification of the gasket G2. In the gasket G2, the recessed portion 4 is not used for detecting an error in the stacking order of the constituent plates. The recessed portion 4 is used for detecting a missing plate of the first intermediate plate 1b and for detecting a case where the front plate 1a or 1d is laminated and the first intermediate plate 1b is missing. Usually, since the weights of the front plate and the first intermediate plate are different, the detection of the stacking error can also be detected in the weight measurement of the gasket.
[0026]
Therefore, in the gasket G2 ′, the surface plates 1a ′ and 1d ′ are not provided with a recessed portion, and are formed in the same outer peripheral shape as the first intermediate plate 1b. Also in the gasket G2 ', detection of erroneous stacking in which the stacking order is wrong, detection of a missing plate other than the above, and detection when two layers of the first intermediate plate are stacked can be performed in the same manner as in the gasket G2. . In many cases, the position, shape, and size of the through holes are common to the surface plate and the intermediate plate. In this case, the front plate 1a 'and 1d' and the first intermediate plate can share the punching die. .
[0027]
FIG. 8 is an exploded perspective view of an essential part of a cylinder head gasket G3 which is a laminated metal gasket according to a third embodiment of the present invention. The upper and lower surface plates 1a and 1d are the same as the surface plates 1a and 1d in the gasket G1 and gasket G2. The first intermediate plate 1b below the surface plate 1a is the same as the first intermediate plate in the gasket G2. In the gasket G3, a second intermediate plate 1c is disposed between the first intermediate plate 1b and the surface plate 1d.
[0028]
The 2nd intermediate plate 1c consists of metal plates, such as a stainless steel plate, has the same outer periphery shape as a 1st intermediate plate, and is not provided with the recessed part corresponding to the recessed part of the surface plates 1a and 1d. The second intermediate plate 1c is provided with a sealing material layer 5 on the surface 1c-1 on the side in contact with the first intermediate plate 1b, and at the position corresponding to the recessed portion 4 of the surface plate 1a, an intermediate plate error made up of characters, symbols and figures. A stacking detection mark 7 is provided. Neither the sealing material layer 5 nor the mark 7 is present on the surface which is the back surface of the surface 1c-1 and which is in contact with the surface plate 1d. Similar to the gasket G1 and the gasket G2, the surface plate erroneous stacking detection mark 6 is provided only on the outer surface of the gasket, that is, the outer surface 1a-1 of the surface plate 1a and the outer surface of the surface plate 1d.
[0029]
In the gasket G3 having the above configuration, an error in the stacking order of the constituent plates can be easily detected from the outside as shown in Table 1. In Table 1, (1) indicates the surface plate 1a, (2) indicates the first intermediate plate 1b, (3) indicates the second intermediate plate 1c, and (4) indicates the surface plate 1d. The “outer surface” in the detection section means the outer surface of the gasket.
[0030]
[Table 1]

[0031]
Similarly, the missing plate and two-layer stack of each component plate can be detected by the appearance of the surface without the sealing material layer on the outer surface of the gasket, the disappearance of the mark 6 from the outer surface of the gasket, the appearance of the mark 7 of the intermediate plate, and the like. However, a case where the second intermediate plate is missing and the first intermediate plate is overlapped (the second intermediate plate is missing) is detected by weighing the gasket.
[0032]
Also in the gasket G3, the punching die of the surface plates 1a and 1d can be shared as well as the gasket G1 and the gasket G2, and the punching plate can also be shared. Further, the gaskets G1, G2, and G3 are different in gasket thickness, and the positions, shapes, and sizes of the through holes such as the combustion chamber hole, the water hole, and the oil hole are the same, and the outer peripheral shape is also the same. In such a case, the punching plate and punching plate of the surface plates 1a and 1d can be shared between the gaskets G1, G2 and G3. Since the first intermediate plate 1b and the second intermediate plate 1c normally have the same position, shape, and size of the through holes, they can share a punching die.
[0033]
【The invention's effect】
In the above-described laminated metal gasket of the present invention, erroneous lamination such as an error in the order of lamination of the constituent plates can be easily detected from the outside. Moreover, it is not necessary to change the shape of the outer peripheral edge of the component plate or the shape of the through hole or the inner diameter for each component plate as in the conventional erroneous stacking discriminating structure, and the die of the component plate can be shared. The punching board can be shared. Therefore, according to the present invention, it is possible to contribute to the cost reduction of the laminated metal gasket by reducing the manufacturing cost of the punching die, reducing the setup time for replacing the punching die, and reducing the work in progress due to the common use of the punching plate.
[Brief description of the drawings]
FIG. 1 is a plan view of a cylinder head gasket according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a main part of the gasket of FIG.
FIG. 3 is an exploded perspective view of a main part of FIG. 2;
4 is an exploded perspective view of the main part of FIG. 2 as viewed from the back side.
FIG. 5 is a perspective view of a main part of a modification of the first embodiment.
FIG. 6 is an exploded perspective view of a main part of a second embodiment of the present invention.
FIG. 7 is a perspective view of a main part of a modification of the second embodiment.
FIG. 8 is an exploded perspective view of a third embodiment of the present invention.
FIG. 9 is a perspective view of a conventional erroneous stacking discriminating structure.
10 is a perspective view of a modified example of the determination structure of FIG. 9. FIG.
FIG. 11 is a perspective view of another example of a conventional erroneous stacking discriminating structure.
12 is a perspective view of a modified example of the determination structure of FIG. 11. FIG.
[Explanation of symbols]
1a, 1a ', 1d, 1d' Surface plate 1b First intermediate plate 1c Second intermediate plate 4 Recessed portion 5 Sealing material layer 6 Surface plate erroneous stacking detection mark 7 Intermediate plate erroneous stacking detection mark

Claims

It consists of two surface plates stacked on upper and lower layers,
The two surface plates have the same outer peripheral shape,
The surface plate has an outer surface located outside during lamination and an inner surface located inside during lamination;
Said surface plate, which has at least a sealing material layer coated on the outer surface, and having an outer surface only to a character, a surface plate erroneous stacking detection mark consisting symbols or graphics, etc. of the surface plate Laminated metal gasket.

Laminated metal gasket according to claim 1 is pre-Symbol table surface plate provided with a recessed portion in the outer periphery in the vicinity of the surface plate erroneous stacking detection mark.

Two surface plates constituting upper and lower two layers;
A first intermediate plate disposed between the two surface plates,
The two surface plates have the same outer peripheral shape,
The surface plate has an outer surface located outside during lamination and an inner surface located inside during lamination;
Said surface plate, it said provided with a coated sealing material layer on the outer surface and the inner surface, having said laminated detection mark outer surface only characters, incorrect surface plate made of symbols or graphics, etc. of the surface plate,
Laminated metal gasket both surfaces of the first intermediate plate, characterized in that not covered by the sealing material layer.

Includes a recessed portion in the outer periphery in the vicinity of the laminated detection mark before Symbol Table faceplate faceplate erroneous,
The laminated metal gasket according to claim 3, wherein a part of the surface of the intermediate plate is exposed to the recessed portion without providing the recessed portion at a position corresponding to the recessed portion.

Two surface plates constituting upper and lower two layers ;
Comprises a first intermediate plate and the second intermediate plate disposed in two layers between the two surface plates,
The two surface plates have the same outer peripheral shape ,
The surface plate has a recess in the outer periphery;
The surface plate has an outer surface located outside during lamination and an inner surface located inside during lamination;
Yes said surface plate, and having a sealing material layer coated on said outer surface and said inner surface, character only to the outer surface in the vicinity of the recess, the surface plate erroneous stacking detection mark consisting symbols or graphics, etc. And
The first intermediate plate and the second intermediate plate do not have a recessed portion at a position corresponding to the recessed portion,
The first intermediate plate located on the surface plate side of the upper layer is not covered with the sealing material layer on both side surfaces, and a part of the surface is exposed to the recessed portion,
The second intermediate plate located on the lower surface plate side has a sealing material layer coated on the surface on the first intermediate plate side, and is composed of characters, symbols, figures or the like at positions corresponding to the recessed portions on the surface. A laminated metal gasket having an intermediate plate erroneous lamination detection mark.

The laminated metal gasket according to claim 5, wherein the first intermediate plate and the second intermediate plate have the same outer peripheral shape.

A surface plate constituting the outer surface of the laminated metal gasket,
The surface plate has an outer surface located outside during lamination and an inner surface located inside during lamination;
The surface plate has a sealing material layer coated on at least the outer surface, and has a surface plate erroneous stack detection mark made of characters, symbols, figures, or the like only on the outer surface of the surface plate. Surface plate for laminated metal gasket.