JP3529727B2 - Structure of the joint part of the child part to the fuel tank made of synthetic resin - Google Patents

Structure of the joint part of the child part to the fuel tank made of synthetic resin

Info

Publication number
JP3529727B2
JP3529727B2 JP2000394659A JP2000394659A JP3529727B2 JP 3529727 B2 JP3529727 B2 JP 3529727B2 JP 2000394659 A JP2000394659 A JP 2000394659A JP 2000394659 A JP2000394659 A JP 2000394659A JP 3529727 B2 JP3529727 B2 JP 3529727B2
Authority
JP
Japan
Prior art keywords
fuel tank
welding
synthetic resin
gasoline barrier
coating layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2000394659A
Other languages
Japanese (ja)
Other versions
JP2002192963A (en
Inventor
和広 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yachiyo Industry Co Ltd
Original Assignee
Yachiyo Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yachiyo Industry Co Ltd filed Critical Yachiyo Industry Co Ltd
Priority to JP2000394659A priority Critical patent/JP3529727B2/en
Priority to DE2001624038 priority patent/DE60124038T2/en
Priority to EP20010305825 priority patent/EP1179445B1/en
Priority to US09/908,271 priority patent/US20020011490A1/en
Publication of JP2002192963A publication Critical patent/JP2002192963A/en
Priority to US10/765,781 priority patent/US20040157020A1/en
Application granted granted Critical
Publication of JP3529727B2 publication Critical patent/JP3529727B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/116—Single bevelled joints, i.e. one of the parts to be joined being bevelled in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/118—Single monotone curved joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1226—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one bevelled joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1228—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one monotone curved joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1284—Stepped joint cross-sections comprising at least one butt joint-segment
    • B29C66/12841—Stepped joint cross-sections comprising at least one butt joint-segment comprising at least two butt joint-segments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/128—Stepped joint cross-sections
    • B29C66/1286—Stepped joint cross-sections comprising at least one bevelled joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/322—Providing cavities in the joined article to collect the burr
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5324—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length
    • B29C66/53245—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being hollow
    • B29C66/53246—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being hollow said single elements being spouts, e.g. joining spouts to containers
    • B29C66/53247—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially annular, i.e. of finite length said articles being hollow said single elements being spouts, e.g. joining spouts to containers said spouts comprising flanges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7172—Fuel tanks, jerry cans

Description

【発明の詳細な説明】 【０００１】 【発明の属する技術分野】本発明は、合成樹脂製燃料タ
ンクの外面に対して子部品を加熱溶接によって結合する
部分の構造に関するものである 【０００２】 【従来の技術】防錆並びに軽量化が容易であり、且つ高
い生産性が得られることから、合成樹脂材のブロー成型
による燃料タンクを使用する機運が近時高まりつつあ
る。 【０００３】ところで、一般にブロー成型に用いられる
高密度ポリエチレン（以下ＨＤＰＥ）は、炭化水素（Ｈ
Ｃ）の不透過性（ガソリンバリア性）が低いので、大気
汚染を防止する見地から、そのままガソリンタンクに用
いるには適していない。 【０００４】ＨＣの透過を抑制するには、エチレンビニ
ルアルコール共重合体（以下ＥＶＯＨと称する）などの
ガソリンバリア性の高い材料を用いることが好ましい
が、このような所謂ガソリンバリア材は比較的高価であ
る上に耐衝撃性が不十分なので、タンクの全体をガソリ
ンバリア材で形成することは、製造コスト及び強度の面
から現実的とは言い難い。 【０００５】他方、ブロー成型された燃料タンクには、
一般にフィラーネックやベントバルブなどの別成型され
た子部品が加熱溶接されるが、上記の如きガソリンバリ
ア材は、加熱溶接による接着性が低いため、仮に子部品
をガソリンバリア材で形成したとすると、燃料タンクへ
の取り付けが厄介になりがちである。 【０００６】このような不都合に対処するために、ＨＤ
ＰＥに代表される如き溶接が比較的容易な材料（易溶接
材）でフィルム状のガソリンバリア材をサンドウィッチ
した積層材で燃料タンクを形成すると共に、ガソリンバ
リア材で形成した子部品の溶接部のみを易溶接材で二色
成型したり、易溶接材で形成した子部品をガソリンバリ
ア材で被覆したりする構造が既に提唱されている。 【０００７】 【発明が解決しようとする課題】しかるに、易溶接材で
形成された子部品をガソリンバリア材で被覆した構造に
よると、溶接前の子部品における易溶接材の溶接面のみ
を単純に露出させた場合、易溶接材の端面とガソリンバ
リア材の端面とが子部品の燃料タンクへの接合面上に並
ぶため、加熱溶接の際に燃料タンクと融合しないガソリ
ンバリア材層が干渉し、子部品の結合強度が不十分とな
ることがあり得る。 【０００８】本発明は、このような従来技術の問題点を
解消すべく案出されたものであり、その主な目的は、ガ
ソリンバリア性を損なわずに合成樹脂製燃料タンクに対
する十分な溶接強度を確保し得るように構成された子部
品を提供することにある。 【０００９】 【課題を解決するための手段】このような目的を果たす
ために、本願請求項１の発明は、少なくとも表層部は易
溶接材からなる合成樹脂製燃料タンクに対し、易溶接材
からなる主部（実施の形態中のベントバルブ１の支持体
部５）およびガソリンバリア材からなる被覆部（実施の
形態中の被覆層５ s ）を有する子部品を結合する部分の
構造を、前記被覆部は、前記主部における前記燃料タン
クに対する接着面と交差する面に直接重ね合わされたも
のであり、前記被覆部が溶接時に軟化して前記主部側へ
流れ込むことを防止すべく溶融した主部を前記被覆部の
側へと流すための案内手段（実施の形態中の環状溝１
１）を前記主部の前記燃料タンクとの当接面における前
記被覆部と隣接する部分に設けたことを特徴とするもの
とした。 【００１０】このようにすれば、ガソリンバリア材層が
易溶接材同士の溶接部に流れ込むことが防止されるの
で、十分な結合強度を確保することができる。 【００１１】 【発明の実施の形態】以下に添付の図面を参照して本発
明について詳細に説明する。 【００１２】図１は、本発明の一適用例として、ベント
バルブ１の燃料タンク２への取付部を示している。この
燃料タンク２は、少なくともその表層部に例えばＨＤＰ
Ｅなどの易溶接材を用いたブロー成型にて形成されてお
り、その上壁には、ベントバルブ１の取付孔３が形成さ
れている。 【００１３】ベントバルブ１は、通常は開いて外部に設
けられたキャニスタ（図示せず）へ液面上の蒸発ガスを
逃がすと共に、液面揺動時にタンク内の燃料が所定の液
位まで上昇した際に閉じ、キャニスタへの通路に燃料が
流出しないようにするためのものであり、その一部をタ
ンク内に挿入した状態で燃料タンク２の上壁に固定され
ている。なお、その構造は公知のベントバルブと何ら変
わるところはないので、ここでは説明を省略する。 【００１４】ベントバルブ１は、例えばポリアセタール
などの耐油性に富む材料で形成されたバルブ機能部４
と、主に燃料タンク２との溶接が可能なＨＤＰＥなどの
如き易溶接材で形成された支持体部５とからなってい
る。 【００１５】バルブ機能部４には、燃料タンク２の上壁
外面に当接するフランジ６がその上部に形成されてい
る。 【００１６】支持体部５は、燃料タンク２の上壁外面に
当接する円板状をなすと共に、キャニスタに連結するホ
ース口７がその上面に設けられている。この支持体部５
は、タンク外の雰囲気に直接接触する表面の略全面にＥ
ＶＯＨ等の如きガソリンバリア材からなる被覆層５ｓ
が、例えば二色成型で一体形成されている。そして燃料
タンク２との対向面に、バルブ機能部４のフランジ６よ
り上方の部分を概ね緊密に受容し得る窪み８が形成され
ており、この窪み８の外周縁部９が燃料タンク２の外面
に加熱溶接されるようになっている。 【００１７】これによると、支持体部５と燃料タンク２
の上壁との互いの対向面間にバルブ機能部４のフランジ
６を挟み込んだ状態で、窪み８を取り囲むように突出し
た外周縁部９の下面を加熱溶融して燃料タンク２に圧接
するといった公知の加熱溶接法（特願平１１−１２６６
３９号明細書参照）を利用することにより、支持体部５
が燃料タンク２に溶接され、且つバルブ機能部４が支持
体部５を介して燃料タンク２に固定されることとなる。 【００１８】さて、ここで燃料タンク２に溶接する以前
の支持体部５における外周縁部９の下端面と被覆層５ｓ
の下端面との間には、図２にＡ寸法で示す段差が設けて
ある。この段差寸法Ａは、外周縁部９の下面をヒータＨ
に当接させて加熱した上で燃料タンク２に圧接した際の
外周縁部９の下面の溶融代に適合するように定められて
おり、Ａ寸法を大きくとると、結合強度は満足し得る
が、被覆層５ｓの下端面と燃料タンク２の外面との間に
隙間が生じてガソリンバリア性が低下するので、易溶接
材からなる外周縁部９が燃料タンク２の外面に溶着した
後に、燃料タンク２の外面に被覆層５ｓの下端面が当接
するようにＡ寸法を設定することが最も望ましい。実際
のところ、製造誤差や溶融代のばらつきを考慮すると、
外周縁部９の溶着と被覆層５ｓ端面の密接とを一致させ
ることは困難であるが、被覆層５ｓの下端面よりも僅か
に早く外周縁部９がヒータＨに当接する程度の段差を設
けるだけで、溶接界面に対する被覆層５ｓの干渉が溶接
強度に影響しないことは実験で確かめられている。 【００１９】被覆層５ｓの端面より外周縁部９を突出さ
せる構造としては、要するに溶接前の支持体部５をヒー
タＨにセットした際に、外周縁部９の方が被覆層５ｓよ
り先にヒータＨに接触すれば良く、例えば図３に示す如
く、外周縁部９の端面を中央が凸となるアール形状とし
たり、図４に示す如く、被覆層５ｓ側が引っ込んだ傾斜
面としたりしても良い。 【００２０】このようにして、支持体部５に設けられる
被覆層５ｓをガソリンバリア材で形成すると共に、外周
縁部９の溶着に干渉しない程度に被覆層５ｓを引っ込ま
せることにより、要求結合強度が満足され、しかも溶接
後はガソリンバリア材からなる部分が燃料タンク２に対
する溶接界面にまで達して支持体部５における易溶接材
部分のタンク外の雰囲気との接触面積が実質的に皆無と
なり、子部品に要求されるガソリンバリア性（ＨＣの透
過抑制性）が満足される。 【００２１】図５は、本発明の一実施形態を示してい
る。これにおいては、易溶接材からなる支持体部５の外
周縁部９のヒータＨに対する当接面における被覆層５ｓ
に近接する部分に、溶融した易溶接材部分が流入する環
状溝１１が設けられている。また外周縁部９の実効溶接
幅寸法Ｂは、溶接強度を確保する上に十分な面積となる
ように定めてある。 【００２２】これによれば、被覆層５ｓがヒーターＨと
の接触で軟化した状態で支持体部５を燃料タンク２に圧
接した際に、易溶接材部分と燃料タンク２との溶接界面
に軟化した被覆層５ｓが入り込むことが、溶融した易溶
接材部分が環状溝１１に流入する圧力で阻止される。つ
まり、支持体部５の外周縁部９のヒータＨに対する当接
面における被覆層５ｓに近接する部分に設けた環状溝１
１が、「被覆部が溶接時に軟化して主部側へ流れ込むこ
とを防止すべく溶融した主部を被覆部の側へと流すため
の案内手段」として作用することとなる。これにより、
ガソリンバリア材層が易溶接材層の燃料タンク２との溶
接に干渉することが防止される。 【００２３】図６は、本発明の別の適用例を示してい
る。これにおいては、燃料タンク２に直接溶接される子
部品としての支持体部５は、円環状をなし、共通の円周
上に、ナット１２がインサートされている。そしてその
内周面に、ガソリンバリア材の被覆層５ｓが形成されて
いる。 【００２４】これの場合も、燃料タンク２との溶接面に
は、図２〜図４に示した段差を設けたり、図５に示した
環状溝１１を設けることにより、支持体部５の溶接強度
がガソリンバリア材層で阻害されることの無いようにさ
れている。 【００２５】これの場合は、バルブ機能部４はガソリン
バリア材で構成されており、そのフランジ部６を通して
インサートナット１２にボルト１３を螺着することによ
り、支持体部５にバルブ機能部４が固定されるので、バ
ルブ機能部４を自由に着脱することが可能となる。 【００２６】なお、被覆層５ｓは、要は気化したガソリ
ンが大気中へ漏出することを防止できれば良いので、図
１に示したように大気に接する面、また図６に示したよ
うに燃料タンク内の雰囲気に接する面のいずれの側に設
けても良く、子部品の形態に応じて最も高いガソリンバ
リア効果が得られる面に形成すれば良い。 【００２７】 【発明の効果】以上説明したように、本発明の請求項１
の構成によれば、加熱時に軟化した被覆層が易溶接材部
分側へ流れ込むことを防止する案内手段により、ガソリ
ンバリア材層が易溶接材同士の溶接界面に流れ込むこと
が防止されるので、易溶接材層を燃料タンクに対して十
分に溶接させて高い結合強度を確保する上に多大な効果
を奏することができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a part for connecting a child part to an outer surface of a synthetic resin fuel tank by heat welding. 2. Description of the Related Art Since rust prevention and weight reduction are easy and high productivity can be obtained, the tendency to use a fuel tank formed by blow molding a synthetic resin material has recently been increasing. Incidentally, high-density polyethylene (hereinafter, HDPE) generally used for blow molding is a hydrocarbon (H).
Since C) has low impermeability (gasoline barrier property), it is not suitable for use in a gasoline tank as it is from the viewpoint of preventing air pollution. In order to suppress the permeation of HC, it is preferable to use a material having a high gasoline barrier property such as an ethylene vinyl alcohol copolymer (hereinafter referred to as EVOH), but such a so-called gasoline barrier material is relatively expensive. In addition, since the impact resistance is insufficient, it is difficult to say that forming the entire tank with a gasoline barrier material is practical in terms of manufacturing cost and strength. [0005] On the other hand, blow-molded fuel tanks include:
Generally, a separately molded child part such as a filler neck or a vent valve is heat-welded.However, since the gasoline barrier material as described above has low adhesion by heat welding, if the child part is formed of a gasoline barrier material, , Mounting on the fuel tank tends to be troublesome. In order to deal with such inconveniences, HD
The fuel tank is formed from a laminated material made of a film-like gasoline barrier material sandwiched between materials that are relatively easy to weld such as PE (easy-to-weld material), and only the welded parts of the child parts formed of the gasoline barrier material A structure has already been proposed in which a two-color molding is performed with an easily weldable material, or a child component formed of the easily weldable material is covered with a gasoline barrier material. However, according to the structure in which the child component formed of the easy-to-weld material is covered with the gasoline barrier material, only the welding surface of the easy-to-weld material in the child component before welding is simply formed. When exposed, the end face of the easy-to-weld material and the end face of the gasoline barrier material are aligned on the joint surface of the child component to the fuel tank, so the gasoline barrier material layer that does not fuse with the fuel tank during heating welding interferes, The bonding strength of the child component may be insufficient. The present invention has been devised in order to solve such problems of the prior art, and a main object of the present invention is to provide a fuel tank made of synthetic resin with sufficient welding strength without impairing gasoline barrier properties. It is an object of the present invention to provide a child component configured so as to ensure the above. [0009] In order to achieve such an object, the invention of claim 1 of the present application provides a fuel tank made of a synthetic resin having at least a surface layer made of an easily weldable material. Main part (support of vent valve 1 in the embodiment)
Part 5) and a coating part made of gasoline barrier material (
The moiety that binds a child component having a coating layer 5 s) in the form
The structure may be such that the cladding portion includes the fuel tank in the main portion.
Directly on the surface that intersects the adhesive surface
The coating is softened during welding and moves toward the main part.
The molten main part is used to prevent the
Guide means for flowing to the side (the annular groove 1 in the embodiment)
1) the front of the main portion in contact with the fuel tank;
Characterized by being provided in a portion adjacent to the covering portion
And With this configuration, the gasoline barrier material layer is prevented from flowing into the welded portion between the easily welded materials, so that a sufficient bonding strength can be secured. The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a mounting portion of a vent valve 1 to a fuel tank 2 as one application example of the present invention. This fuel tank 2 has, for example, HDP
It is formed by blow molding using an easy-welding material such as E, and a mounting hole 3 of the vent valve 1 is formed on an upper wall thereof. The vent valve 1 is normally opened to allow the evaporative gas on the liquid level to escape to a canister (not shown) provided outside, and that the fuel in the tank rises to a predetermined liquid level when the liquid level fluctuates. It is closed to prevent fuel from flowing out to the passage to the canister, and is fixed to the upper wall of the fuel tank 2 with a part thereof inserted into the tank. The structure is not different from that of a known vent valve, and the description is omitted here. The vent valve 1 has a valve function portion 4 made of a material having high oil resistance such as polyacetal.
And a support portion 5 formed of an easily weldable material such as HDPE capable of being welded to the fuel tank 2. A flange 6 is formed in the upper part of the valve function part 4 to be in contact with the outer surface of the upper wall of the fuel tank 2. The support member 5 has a disk shape in contact with the outer surface of the upper wall of the fuel tank 2, and has a hose port 7 connected to the canister on the upper surface thereof. This support 5
Is almost completely exposed to the atmosphere outside the tank.
Coating layer 5s made of gasoline barrier material such as VOH
Are integrally formed by, for example, two-color molding. A depression 8 is formed on a surface facing the fuel tank 2 so as to be able to receive a portion of the valve function part 4 above the flange 6 in a substantially tight manner, and an outer peripheral edge 9 of the depression 8 is formed on an outer surface of the fuel tank 2. It is designed to be welded by heat. According to this, the support 5 and the fuel tank 2
In a state where the flange 6 of the valve function part 4 is sandwiched between the opposing surfaces with the upper wall, the lower surface of the outer peripheral edge 9 protruding so as to surround the recess 8 is heated and melted and pressed against the fuel tank 2. A known heating welding method (Japanese Patent Application No. 11-1266)
No. 39), the support portion 5
Are welded to the fuel tank 2, and the valve function unit 4 is fixed to the fuel tank 2 via the support 5. Now, the lower end surface of the outer peripheral edge 9 of the support 5 before welding to the fuel tank 2 and the coating layer 5s
A step is provided between the lower end surface and the lower end surface of FIG. The step size A is such that the lower surface of the outer peripheral edge 9 is
It is set so as to be adapted to the melting margin of the lower surface of the outer peripheral edge portion 9 when pressed against the fuel tank 2 after being heated by being brought into contact with the fuel tank 2. Since a gap is formed between the lower end surface of the coating layer 5s and the outer surface of the fuel tank 2 and the gasoline barrier property is reduced, the outer peripheral edge 9 made of the easily welded material is welded to the outer surface of the fuel tank 2 and the fuel is removed. It is most desirable to set the dimension A so that the lower end surface of the coating layer 5s abuts on the outer surface of the tank 2. As a matter of fact, considering the manufacturing error and the variation of the melting allowance,
Although it is difficult to match the welding of the outer peripheral edge 9 with the close contact of the end face of the coating layer 5s, a step is provided so that the outer peripheral edge 9 contacts the heater H slightly earlier than the lower end face of the coating layer 5s. It has been experimentally confirmed that the interference of the coating layer 5s with the welding interface does not affect the welding strength. The structure in which the outer peripheral edge 9 protrudes from the end face of the coating layer 5s is, in short, when the support member 5 before welding is set on the heater H, the outer peripheral edge 9 is located ahead of the coating layer 5s. It suffices to contact the heater H. For example, as shown in FIG. 3, the end surface of the outer peripheral edge portion 9 may have a round shape in which the center is convex, or as shown in FIG. Is also good. In this way, by forming the coating layer 5s provided on the support member 5 from a gasoline barrier material and by retracting the coating layer 5s so as not to interfere with the welding of the outer peripheral edge 9, the required bonding strength is obtained. After welding, the portion made of the gasoline barrier material reaches the welding interface with the fuel tank 2 and the contact area of the easily welded material portion of the support portion 5 with the atmosphere outside the tank is substantially eliminated. The gasoline barrier property (HC permeation suppression property) required for the child component is satisfied. [0021] FIG. 5 shows a Kazumi facilities embodiment of the present invention. In this case, the coating layer 5s on the contact surface of the outer peripheral edge 9 of the support portion 5 made of an easily weldable material with the heater H
Is provided with an annular groove 11 into which the molten easy-to-weld material portion flows. Further, the effective welding width dimension B of the outer peripheral edge portion 9 is determined so as to have a sufficient area for securing the welding strength. According to this, when the support 5 is pressed against the fuel tank 2 in a state where the coating layer 5s is softened by contact with the heater H, the welding interface between the easily welded material portion and the fuel tank 2 is softened. The penetration of the covered coating layer 5 s is prevented by the pressure at which the melted easily welded material portion flows into the annular groove 11. One
In other words, the outer peripheral edge 9 of the support 5 is brought into contact with the heater H.
Groove 1 provided in a portion of the surface close to coating layer 5s
1 indicates that the coating is softened during welding and flows into the main part.
To flow the molten main part to the side of the coating part to prevent
As a guide means of the vehicle. This allows
The gasoline barrier material layer is prevented from interfering with the welding of the easily welded material layer to the fuel tank 2. FIG. 6 shows another application example of the present invention. In this case, the support portion 5 as a child component directly welded to the fuel tank 2 has an annular shape, and a nut 12 is inserted on a common circumference. A coating layer 5s of a gasoline barrier material is formed on the inner peripheral surface. Also in this case, by providing the steps shown in FIGS. 2 to 4 on the welding surface with the fuel tank 2 or by providing the annular groove 11 shown in FIG. The strength is not hindered by the gasoline barrier material layer. In this case, the valve function part 4 is made of a gasoline barrier material, and a bolt 13 is screwed into the insert nut 12 through the flange part 6 so that the valve function part 4 is attached to the support part 5. Since it is fixed, the valve function unit 4 can be freely attached and detached. The coating layer 5s is only required to prevent the vaporized gasoline from leaking into the atmosphere. Therefore, as shown in FIG. 1, the coating layer 5s is in contact with the atmosphere, and as shown in FIG. It may be provided on any side of the surface in contact with the inside atmosphere, and may be formed on the surface where the highest gasoline barrier effect can be obtained according to the form of the child component. As described above, according to the first aspect of the present invention,
According to the configuration described above, the coating layer softened during heating is
The guide means to prevent it from flowing into the minute
Barrier layer flows into the weld interface between easy-to-weld materials
Therefore, a great effect can be achieved in sufficiently welding the easily welded material layer to the fuel tank to secure high bonding strength.

【図面の簡単な説明】 【図１】自動車の燃料タンクの上壁にベントバルブが固
定された状態の縦断面図 【図２】本発明の適用例を示す部分的拡大断面図 【図３】バリエーションの一例を示す部分的拡大断面図 【図４】別のバリエーションを示す部分的拡大断面図 【図５】本発明の実施形態を示す部分的拡大断面図 【図６】さらに別の適用例を示す部分的拡大断面図 【符号の説明】 １ ベントバルブ ２ 燃料タンク ３ 取付孔 ４ バルブ機能部 ５ 支持体部 ５ｓ 被覆層 ６ フランジ ７ ホース口 ８ 窪み ９ 外周縁部 １１ 環状溝 １２ インサートナット １３ ボルトBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a state in which a vent valve is fixed to an upper wall of a fuel tank of an automobile. FIG. 2 is a partially enlarged sectional view showing an application example of the present invention. partial enlarged sectional view showing an example of a variation of the partial enlarged cross-sectional view [FIG. 6] yet another application example illustrating an embodiment of a partially enlarged cross-sectional view showing the Figure 4 another variation the present invention; FIG [Description of Signs] 1 Vent valve 2 Fuel tank 3 Mounting hole 4 Valve function part 5 Support part 5s Coating layer 6 Flange 7 Hose port 8 Depression 9 Outer edge 11 Annular groove 12 Insert nut 13 Bolt

フロントページの続き (56)参考文献 特開2002−114047（ＪＰ，Ａ) 特開2002−137643（ＪＰ，Ａ) 特開2001−113963（ＪＰ，Ａ) 特開2002−211254（ＪＰ，Ａ) 特開2002−52658（ＪＰ，Ａ) 特開 平５−51044（ＪＰ，Ａ) 特開 平11−141427（ＪＰ，Ａ) 実開 平５−30655（ＪＰ，Ｕ) 実開 平２−10121（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B60K 15/00 - 15/10 B29C 65/20 B29L 22:00 Continuation of the front page (56) References JP-A-2002-114047 (JP, A) JP-A-2002-137643 (JP, A) JP-A-2001-11363 (JP, A) JP-A-2002-211254 (JP, A) JP 2002-52658 (JP, A) JP 5-51044 (JP, A) JP 11-141427 (JP, A) JP 5-30655 (JP, U) JP 2-10121 (JP , U) (58) Fields surveyed (Int. Cl. 7 , DB name) B60K 15/00-15/10 B29C 65/20 B29L 22:00

Claims (1)

(57)【特許請求の範囲】 【請求項１】 少なくとも表層部は易溶接材からなる合
成樹脂製燃料タンクに対し、易溶接材からなる主部およ
びガソリンバリア材からなる被覆部を有する子部品を結
合する部分の構造であって、 前記被覆部は、前記主部における前記燃料タンクに対す
る接着面と交差する面に直接重ね合わされたものであ
り、前記被覆部が溶接時に軟化して前記主部側へ流れ込むこ
とを防止すべく溶融した主部を前記被覆部の側へと流す
ための案内手段を前記主部の前記燃料タンクとの当接面
における前記被覆部と隣接する部分に 設けたことを特徴
とする合成樹脂製燃料タンクに対する子部品結合部の構
造。(57) [Claims 1] At least a surface layer portion of a synthetic resin fuel tank made of an easily welded material, a child component having a main portion made of an easily welded material and a covering portion made of a gasoline barrier material. The covering portion is directly superimposed on a surface of the main portion that intersects with the surface to be bonded to the fuel tank, and the covering portion softens at the time of welding and the main portion is To the side
The molten main part to the side of the coating part to prevent
Guide means for contacting the main part with the fuel tank
3. The structure of a sub- part coupling portion for a synthetic resin fuel tank, wherein the sub- component coupling portion is provided in a portion adjacent to the covering portion .
JP2000394659A 2000-07-21 2000-12-26 Structure of the joint part of the child part to the fuel tank made of synthetic resin Expired - Fee Related JP3529727B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2000394659A JP3529727B2 (en) 2000-12-26 2000-12-26 Structure of the joint part of the child part to the fuel tank made of synthetic resin
DE2001624038 DE60124038T2 (en) 2000-07-21 2001-07-05 Plastic fuel tank with arrangement for fuel-tight welding of a component
EP20010305825 EP1179445B1 (en) 2000-07-21 2001-07-05 Plastic fuel tank having an arrangement for welding a component part in a fuel impermeable manner
US09/908,271 US20020011490A1 (en) 2000-07-21 2001-07-17 Plastic fuel tank having an arrangement for welding a component part in a fuel impermeable manner
US10/765,781 US20040157020A1 (en) 2000-07-21 2004-01-26 Plastic fuel tank having an arrangement for welding a component part in a fuel impermeable manner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000394659A JP3529727B2 (en) 2000-12-26 2000-12-26 Structure of the joint part of the child part to the fuel tank made of synthetic resin

Publications (2)

Publication Number Publication Date
JP2002192963A JP2002192963A (en) 2002-07-10
JP3529727B2 true JP3529727B2 (en) 2004-05-24

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5017162B2 (en) * 2008-03-27 2012-09-05 本田技研工業株式会社 Fuel pump mounting structure
US8409393B2 (en) 2010-12-03 2013-04-02 Yachiyo Industry Co., Ltd. Method of welding a component part to a plastic fuel tank
JP5369081B2 (en) * 2010-12-03 2013-12-18 八千代工業株式会社 Fuel tank component joining method
JP5369080B2 (en) * 2010-12-03 2013-12-18 八千代工業株式会社 Fuel tank component joint structure
BR112020008399A2 (en) * 2017-11-30 2020-11-03 Honda Motor Co., Ltd. tank made of resin

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08182Y2 (en) * 1988-07-06 1996-01-10 日産自動車株式会社 Resin tube connection structure
JP3115361B2 (en) * 1991-08-27 2000-12-04 株式会社クラタ Resin container and method for producing the same
JP2574114Y2 (en) * 1991-10-01 1998-06-11 株式会社ニフコ Fuel leakage prevention valve for vehicles
JP3395611B2 (en) * 1997-10-31 2003-04-14 三菱自動車工業株式会社 Plastic fuel tank
JP2001113963A (en) * 1999-10-15 2001-04-24 Honda Motor Co Ltd Fuel tank made of resin
JP4566361B2 (en) * 2000-08-08 2010-10-20 株式会社クラレ Multi-layer molded parts for fuel containers with excellent gasoline barrier properties
JP2002114047A (en) * 2000-10-10 2002-04-16 Horie Metal Co Ltd Resin component fitted to opening section of fuel tank and manufacturing method for resin component
JP2002137643A (en) * 2000-11-02 2002-05-14 Nifco Inc Connector for fuel tank
JP4629888B2 (en) * 2000-11-17 2011-02-09 株式会社ニフコ Fuel tank connector

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