JP2016128277A - Fitting structure of integrated component of automobile fuel tank - Google Patents
Fitting structure of integrated component of automobile fuel tank Download PDFInfo
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Abstract
Description
本発明は、熱可塑性合成樹脂製の燃料タンクの内蔵部品の取付構造に関するものであり、特に、熱可塑性合成樹脂部材をブロー成形することにより外壁が形成され、内部に内蔵部品を有する燃料タンクの内蔵部品の取付構造に関するものである。 The present invention relates to a structure for mounting a built-in component of a fuel tank made of a thermoplastic synthetic resin, and in particular, a fuel tank having a built-in component inside with an outer wall formed by blow molding a thermoplastic synthetic resin member. The present invention relates to a built-in component mounting structure.
従来、自動車用等の燃料タンクの構造としては、金属製のものが用いられていたが、近年、車両の軽量化や、錆が発生しないこと、所望の形状に成形しやすいことなどによって熱可塑性合成樹脂製のものが用いられるようになってきた。
熱可塑性合成樹脂製の自動車用燃料タンクの製造は、中空体を成形することの容易性からブロー成形方法が多く用いられてきた。ブロー成形方法では、溶融した熱可塑性合成樹脂部材のパリソンを円筒状にして上から押出して、そのパリソンを金型で挟みパリソン中に空気を吹き込み、自動車用燃料タンクを製造していた。
Conventionally, the structure of fuel tanks for automobiles and the like has been made of metal, but in recent years, thermoplasticity has been achieved by reducing the weight of the vehicle, eliminating rust, and easily forming into a desired shape. Those made of synthetic resin have come to be used.
In the production of an automotive fuel tank made of a thermoplastic synthetic resin, a blow molding method has been often used because of the ease of molding a hollow body. In the blow molding method, a parison of a molten thermoplastic synthetic resin member is formed into a cylindrical shape and extruded from above, and the parison is sandwiched between molds and air is blown into the parison to manufacture an automobile fuel tank.
一方、ブロー成形方法においても、燃料タンクの内部にタンク外壁の剛性を向上させるため、又は他の機能を有した内蔵部品を設けることが求められている。
燃料タンクの内部に内蔵部品を設けるには、図２４〜図２５に示すように行っている場合がある（例えば、特許文献１参照。）。
それは、まず、図２４に示すように、パリソン１０８がブロー成形金型１４０内に入る前に内蔵部品１２０を支持棒１４１に載せて、ブロー成形金型１４０を開いて、その内部に位置させる。その後、ブロー成形金型１４０を開いたままで、パリソン１０８を下降させて、パリソン１０８の内部に内蔵部品１２０が位置するようにする。
On the other hand, in the blow molding method, it is required to provide a built-in component having other functions in order to improve the rigidity of the outer wall of the tank inside the fuel tank.
In some cases, the built-in components are provided inside the fuel tank as shown in FIGS. 24 to 25 (see, for example, Patent Document 1).
First, as shown in FIG. 24, before the parison 108 enters the blow molding die 140, the built-in component 120 is placed on the support bar 141, and the blow molding die 140 is opened and positioned therein. Thereafter, the parison 108 is lowered while the blow molding die 140 is kept open so that the built-in component 120 is positioned inside the parison 108.
その後、図２５に示すように、ブロー成形金型１４０を閉じる前に、ブロー成形金型１４０の両側から押圧ピン１４２を出し、パリソン１０８を押圧して、パリソン１０８を内蔵部品１２０の側端に押付ける。このとき、パリソン１０８の内面はまだ固化していないので、パリソン１０８と内蔵部品１２０の側端は、融着することができる。
そして、支持棒１４１を下降させて、ブロー成形金型１４０を閉じて、空気を吹き込み、ブロー成形を行う。
Thereafter, as shown in FIG. 25, before closing the blow molding die 140, the pressing pins 142 are taken out from both sides of the blow molding die 140, the parison 108 is pressed, and the parison 108 is placed on the side end of the built-in component 120. Press. At this time, since the inner surface of the parison 108 is not yet solidified, the side ends of the parison 108 and the built-in component 120 can be fused.
Then, the support bar 141 is lowered, the blow molding die 140 is closed, and air is blown to perform blow molding.
この場合は、内蔵部品１２０の先端に形成したパリソン１０８と当接する取付部材溶着面１３３とパリソン１０８の内面とは単に接触するのみで、パリソン１０８の内部に取付部材溶着面１３３が侵入せず、接着性が弱く、充分に融着強度が大きくなく、燃料の振動や、燃料タンクの膨張等により、剥離する恐れがあった。 In this case, the attachment member welding surface 133 that contacts the parison 108 formed at the front end of the built-in component 120 is merely in contact with the inner surface of the parison 108, and the attachment member welding surface 133 does not enter the inside of the parison 108. The adhesiveness was weak and the fusion strength was not sufficiently high, and there was a risk of peeling due to vibration of the fuel or expansion of the fuel tank.
そのため、図２６に示すように、内蔵部品の円筒状の側壁２３１を有する取付部材２３０の取付部材溶着面２３３に複数の円柱状の当接ピン２３４を形成し、図２７に示すように、パリソン２０８の内面に押圧し、溶着したものが考えられている（例えば、特許文献２参照。）。
このとき、低温衝撃性を考慮して、内蔵部品の取付部材２３０に係る応力が低くなるように、取付部材溶着面２３３とパリソン２０８との取付部材溶着面積を広くすることが必要となっている。
Therefore, as shown in FIG. 26, a plurality of column-shaped contact pins 234 are formed on the attachment member welding surface 233 of the attachment member 230 having the cylindrical side wall 231 of the built-in component, and as shown in FIG. One that is pressed against and welded to the inner surface of 208 is considered (for example, see Patent Document 2).
At this time, it is necessary to increase the attachment member welding area between the attachment member welding surface 233 and the parison 208 so that the stress applied to the attachment member 230 of the built-in component is reduced in consideration of the low temperature impact property. .
また、取付部材２３０とパリソン２０８の溶着強度を確保するため、取付部材溶着面２３３をパリソン２０８に強く押圧した場合には、図２７に示すように、パリソン２０８から溶融樹脂であるノッチ２０９がはみ出すように形成される。この場合には、取付部材２３０の溶着部分に衝撃が加わった場合には、ノッチ２０９の部分に応力が集中して、燃料タンクの外壁に応力がかかる恐れがあった。 Further, in order to secure the welding strength between the mounting member 230 and the parison 208, when the mounting member welding surface 233 is strongly pressed against the parison 208, as shown in FIG. 27, the notch 209 that is a molten resin protrudes from the parison 208. Formed as follows. In this case, when an impact is applied to the welded portion of the mounting member 230, the stress concentrates on the notch 209, and there is a possibility that the outer wall of the fuel tank is stressed.
そこで、図２８に示すように、取付部材３３０の取付部材溶着面３３３を燃料タンク３１０の外壁突出部３１８よりも大きくするものがある。
しかし、この場合には、図２９に示すように、取付部材３３０が剛性を有するため、円筒状に形成し、衝撃を吸収するために円筒状の取付部材３３０に衝撃吸収孔３３１を設けている。このため、円筒状の取付部材３３０の取付部材溶着面３３３の上面と衝撃吸収孔３３１を形成することに手間が掛かり、コストが増大している。
Therefore, as shown in FIG. 28, there are some which make the attachment member welding surface 333 of the attachment member 330 larger than the outer wall protrusion 318 of the fuel tank 310.
However, in this case, as shown in FIG. 29, since the attachment member 330 has rigidity, the attachment member 330 is formed in a cylindrical shape, and a shock absorbing hole 331 is provided in the cylindrical attachment member 330 to absorb the impact. . For this reason, it takes time and labor to form the upper surface of the attachment member welding surface 333 of the cylindrical attachment member 330 and the shock absorbing hole 331, and the cost is increased.
そのため、本発明は、剛性が大きく、製造が容易な内蔵部品を燃料タンク内の所定の位置に内蔵部品を取付けることができる燃料タンクを提供することを課題とする。 Therefore, an object of the present invention is to provide a fuel tank in which a built-in component having high rigidity and easy manufacture can be mounted at a predetermined position in the fuel tank.
上記課題を解決するための請求項１の本発明は、内部に内蔵部品を取付けられ、合成樹脂で形成された外壁を有する自動車用燃料タンクの内蔵部品の取付構造において、
内蔵部品には、燃料タンクのタンク外壁の上下の内面に融着して内蔵部品を取付ける上部当接部と下部当接部、及び上部当接部と下部当接部を接続する本体部を有し、
上部当接部と下部当接部は、それぞれタンク外壁の内面に溶着される上部溶着面と下部溶着面を有し、
タンク外壁は、燃料タンク内側に突出する外壁内面突出部が形成され、外壁内面突出部の上部溶着面と下部溶着面と対向する面は、平面状の外壁内面溶着面が形成されたことを特徴とする自動車用燃料タンクの内蔵部品の取付構造である。
The present invention of claim 1 for solving the above-mentioned problem is a mounting structure for a built-in component of an automotive fuel tank having a built-in component mounted inside and having an outer wall formed of a synthetic resin.
The built-in parts have upper and lower abutting parts that are fused to the upper and lower inner surfaces of the tank outer wall of the fuel tank, and a main body part that connects the upper and lower abutting parts. And
The upper contact portion and the lower contact portion each have an upper weld surface and a lower weld surface that are welded to the inner surface of the tank outer wall,
The outer wall of the tank is formed with an outer wall inner surface protruding portion that protrudes to the inside of the fuel tank, and a flat outer wall inner surface is formed on the surface facing the upper and lower welding surfaces of the outer wall inner surface protruding portion. It is the attachment structure of the built-in components of the fuel tank for vehicles.
請求項１の本発明では、内部に内蔵部品を取付けられ、合成樹脂で形成されたタンク外壁を有する自動車用燃料タンクの内蔵部品の取付構造において、内蔵部品には、タンク外壁の上下の内面に融着して内蔵部品を取付ける上部当接部と下部当接部、及び上部当接部と下部当接部を接続する本体部を有する。このため、上部当接部と下部当接部でタンク外壁の上部と下部を支えて、本体部でタンク外壁の衝撃を吸収し、過度の膨張と収縮を防止することができる。 According to the first aspect of the present invention, in the mounting structure for a built-in component of an automobile fuel tank having a tank outer wall formed with a synthetic resin and having a built-in component attached to the inside, the built-in component is provided on the upper and lower inner surfaces of the tank outer wall. An upper contact portion and a lower contact portion for attaching a built-in component by fusing, and a main body portion for connecting the upper contact portion and the lower contact portion. Therefore, the upper and lower contact portions support the upper and lower portions of the tank outer wall, and the main body portion can absorb the impact of the tank outer wall and prevent excessive expansion and contraction.
上部当接部と下部当接部は、それぞれタンク外壁の内面に溶着される上部溶着面と下部溶着面を有する。このため、上部当接部と下部当接部がタンク外壁の上部壁と下部壁の内面に融着して、本体部が上部と下部の壁の間を保持して、タンク外壁の剛性を向上させることができる。 The upper contact portion and the lower contact portion each have an upper weld surface and a lower weld surface that are welded to the inner surface of the tank outer wall. For this reason, the upper and lower contact portions are fused to the inner surfaces of the upper and lower walls of the tank outer wall, and the main body portion holds the space between the upper and lower walls to improve the rigidity of the tank outer wall. Can be made.
タンク外壁は、燃料タンク内側に突出する外壁内面突出部が形成され、外壁内面突出部の上部溶着面と下部溶着面と対向する面は、平面状の外壁内面溶着面が形成された。このため、上部当接部と下部当接部がタンク外壁の上部壁と下部壁の外壁内面溶着面と確実に溶着して、タンク外壁の剛性を向上させることができる。 The tank outer wall has an outer wall inner surface protruding portion that protrudes toward the inside of the fuel tank, and a flat outer wall inner surface welding surface is formed on the surface facing the upper and lower welding surfaces of the outer wall inner surface protruding portion. For this reason, the upper contact portion and the lower contact portion are securely welded to the upper wall of the tank outer wall and the outer wall inner surface of the lower wall, thereby improving the rigidity of the tank outer wall.
請求項２の本発明は、内蔵部品の本体部は、上部当接部と下部当接部を接続する複数の板状の縦補強リブである自動車用燃料タンクの内蔵部品の取付構造である。 The present invention of claim 2 is a mounting structure for a built-in component of a fuel tank for an automobile, wherein the main body portion of the built-in component is a plurality of plate-like longitudinal reinforcing ribs connecting the upper abutting portion and the lower abutting portion.
請求項２の本発明では、内蔵部品の本体部は、上部当接部と下部当接部を接続する複数の板状の縦補強リブである。このため、複数の板状の縦補強リブが内蔵部品の本体部の剛性を向上させることができるとともに、板状の縦補強リブであるため、縦補強リブと上部当接部と下部当接部を合わせて１回の金型成形により成形することができ、成形が容易である。 In the present invention of claim 2, the main body portion of the built-in component is a plurality of plate-like longitudinal reinforcing ribs connecting the upper contact portion and the lower contact portion. For this reason, the plurality of plate-like vertical reinforcing ribs can improve the rigidity of the body part of the built-in component and are plate-like vertical reinforcing ribs, so that the vertical reinforcing rib, the upper contact portion, and the lower contact portion Can be formed by one-time molding, and molding is easy.
請求項３の本発明は、内蔵部品の本体部は、上部当接部の中心部と下部当接部の中心部を接続する棒状の中心軸である自動車用燃料タンクの内蔵部品の取付構造である。 According to a third aspect of the present invention, there is provided a mounting structure for a built-in component of a fuel tank for an automobile, wherein the main body portion of the built-in component is a rod-shaped central shaft that connects the central portion of the upper contact portion and the central portion of the lower contact portion. is there.
請求項３の本発明では、内蔵部品の本体部は、上部当接部の中心部と下部当接部の中心部を接続する棒状の中心軸である。このため、棒状の中心軸で上部当接部と下部当接部を接続して保持することができるとともに、棒状の中心軸であるため、中心軸と上部当接部と下部当接部を合わせて１回の金型成形により成形することができ、成形が容易である。 According to a third aspect of the present invention, the main body portion of the built-in component is a rod-shaped central axis that connects the central portion of the upper contact portion and the central portion of the lower contact portion. For this reason, the upper contact portion and the lower contact portion can be connected and held by the rod-shaped central axis, and the center shaft, the upper contact portion, and the lower contact portion are aligned with each other because it is a rod-shaped central axis. Therefore, the molding can be easily performed by one-time molding.
請求項４の本発明は、内蔵部品の本体部は、縦補強リブ又は中心軸に縦補強リブ又は中心軸と直交するように形成された板状の横補強リブが設けられた自動車用燃料タンクの内蔵部品の取付構造である。 According to a fourth aspect of the present invention, there is provided an automobile fuel tank in which a main body portion of a built-in component is provided with a vertical reinforcing rib or a plate-like horizontal reinforcing rib formed at a central axis so as to be orthogonal to the vertical reinforcing rib or the central axis. The built-in component mounting structure.
請求項４の本発明では、内蔵部品の本体部は、縦補強リブ又は中心軸に縦補強リブ又は中心軸と直交するように形成された板状の横補強リブが設けられた。このため、板状の横補強リブにより縦補強リブ又は中心軸の剛性を向上させることができ、燃料タンクへの衝撃を確実に吸収することができるとともに、板状の横補強リブであるため、横補強リブと上部当接部と下部当接部を合わせて縦補強リブ又は中心軸と同時に、１回の金型成形により成形することができ、成形が容易である。 In the present invention of claim 4, the main body portion of the built-in component is provided with a vertical reinforcing rib or a plate-like horizontal reinforcing rib formed on the central axis so as to be orthogonal to the vertical reinforcing rib or the central axis. For this reason, the rigidity of the vertical reinforcing rib or the central axis can be improved by the plate-shaped lateral reinforcing rib, and the impact to the fuel tank can be absorbed reliably, and the plate-shaped lateral reinforcing rib is used. The horizontal reinforcing rib, the upper abutting portion, and the lower abutting portion can be combined together with the vertical reinforcing rib or the central axis, and can be molded by a single molding process, which is easy to mold.
請求項５の本発明は、内蔵部品の本体部は、中心軸に縦補強リブが形成され、縦補強リブに縦補強リブと直交するように形成された複数の板状の横補強リブが設けられた自動車用燃料タンクの内蔵部品の取付構造である。 According to the present invention of claim 5, the main body portion of the built-in component is provided with a plurality of plate-like lateral reinforcing ribs formed so that a longitudinal reinforcing rib is formed on the central axis, and the longitudinal reinforcing rib is formed so as to be orthogonal to the longitudinal reinforcing rib. 1 is a mounting structure of a built-in component of an automobile fuel tank.
請求項５の本発明では、内蔵部品の本体部は、中心軸に縦補強リブが形成され、縦補強リブに縦補強リブと直交するように形成された複数の板状の横補強リブが設けられた。このため、複数の板状の横補強リブにより縦補強リブと中心軸の剛性を向上させることができ、横補強リブ、縦補強リブと中心軸が合わせて、燃料タンクへの衝撃を確実に吸収することができるとともに、板状の縦補強リブと横補強リブ及び棒状の中心軸であるため、上部当接部と下部当接部を合わせて縦補強リブ、横補強リブ及び中心軸を同時に、１回の金型成形により成形することができ、成形が容易である。 In the present invention of claim 5, the main body portion of the built-in component is provided with a plurality of plate-like transverse reinforcing ribs formed so that the longitudinal reinforcing ribs are formed on the central axis and the longitudinal reinforcing ribs are formed to be orthogonal to the longitudinal reinforcing ribs. It was. For this reason, the rigidity of the longitudinal reinforcement rib and the central axis can be improved by the plurality of plate-shaped lateral reinforcement ribs, and the lateral reinforcement rib, the longitudinal reinforcement rib and the central axis are combined to reliably absorb the impact on the fuel tank. Since it is a plate-like vertical reinforcing rib and horizontal reinforcing rib and a rod-shaped central axis, the vertical reinforcing rib, the horizontal reinforcing rib and the central axis are simultaneously combined with the upper abutting portion and the lower abutting portion, Molding can be performed by one-time molding, and molding is easy.
請求項６の本発明は、外壁内面溶着面は、上部溶着面と下部溶着面よりも小さく形成されるとともに、上部溶着面と下部溶着面と外壁内面溶着面が溶着された自動車用燃料タンクの内蔵部品の取付構造である。 According to a sixth aspect of the present invention, there is provided an automobile fuel tank in which an outer wall inner surface is formed smaller than an upper weld surface and a lower weld surface, and an upper weld surface, a lower weld surface, and an outer wall inner surface are welded. This is a built-in component mounting structure.
請求項６の本発明では、外壁内面溶着面は、上部溶着面と下部溶着面よりも小さく形成されるとともに、上部溶着面と下部溶着面と外壁内面溶着面が溶着された。このため、上部溶着面と下部溶着面を外壁内面溶着面に溶着したときに、溶着部分の溶融樹脂のノッチが上部溶着面と下部溶着面側に生じて、外部からの低温衝撃が加わっても、内蔵部品の上部溶着面と下部溶着面側に応力がかかり、燃料タンクの外壁に損傷が生じることがない。 According to the sixth aspect of the present invention, the outer wall inner surface is formed smaller than the upper weld surface and the lower weld surface, and the upper weld surface, the lower weld surface, and the outer wall inner surface are welded. For this reason, when the upper weld surface and the lower weld surface are welded to the inner surface of the outer wall, a notch of the molten resin in the weld portion occurs on the upper weld surface and the lower weld surface side, and even if external low temperature impact is applied As a result, stress is not applied to the upper weld surface and the lower weld surface side of the built-in component, and the outer wall of the fuel tank is not damaged.
請求項７の本発明は、中心軸又は縦補強リブに衝撃により破断する衝撃吸収部が形成された自動車用燃料タンクの内蔵部品の取付構造である。 The present invention of claim 7 is a mounting structure for a built-in component of an automobile fuel tank in which an impact absorbing portion that is broken by an impact is formed on a central shaft or a longitudinal reinforcing rib.
請求項７の本発明では、中心軸又は縦補強リブに衝撃により破断する衝撃吸収部が形成された。このため、燃料タンクに過度の衝撃が加わった場合には、中心軸又は縦補強リブの衝撃吸収部が破断してその衝撃を吸収することができ、タンク外壁に損傷を生ずることがない。 In the present invention of claim 7, an impact absorbing portion that is broken by impact is formed on the central shaft or the longitudinal reinforcing rib. For this reason, when an excessive impact is applied to the fuel tank, the impact absorbing portion of the central shaft or the longitudinal reinforcing rib can be broken to absorb the impact, and the tank outer wall is not damaged.
上部当接部と下部当接部は、それぞれタンク外壁の内面に溶着される上部溶着面と下部溶着面を有するため、上部当接部と下部当接部がタンク外壁の上部壁と下部壁の内面に融着して、本体部が上部当接部と下部当接部を保持して、タンク外壁の剛性を向上させることができる。 Since the upper contact portion and the lower contact portion respectively have an upper weld surface and a lower weld surface that are welded to the inner surface of the tank outer wall, the upper contact portion and the lower contact portion are connected to the upper wall and the lower wall of the tank outer wall. By fusing to the inner surface, the main body portion can hold the upper contact portion and the lower contact portion, and the rigidity of the tank outer wall can be improved.
タンク外壁は、燃料タンク内側に突出する外壁内面突出部が形成され、外壁内面突出部の上部溶着面と下部溶着面と対向する面は、平面状の外壁内面溶着面が形成されたため、上部当接部と下部当接部がタンク外壁の上部壁と下部壁の外壁内面溶着面と確実に溶着して、タンク外壁の剛性を向上させることができる。 The tank outer wall has an outer wall inner surface protruding part that protrudes to the inside of the fuel tank, and the upper and lower surfaces of the outer wall inner surface protruding part are formed with a flat outer wall inner surface. The contact portion and the lower contact portion are reliably welded to the upper wall of the tank outer wall and the outer wall inner surface of the lower wall, so that the rigidity of the tank outer wall can be improved.
本発明の実施の形態である自動車用の燃料タンク１の内蔵部品の取付構造について、図１〜図２３に基づき説明する。
本発明の実施の形態では、燃料タンク１は、図１に示すように、その燃料タンク１に燃料ポンプ（図示せず）等を出し入れするためにポンプユニット取付孔４が上面に形成されている。また、燃料タンク１の側面又は上面には、インレットパイプ（図示せず）から燃料を注入する燃料注入孔５が形成されている。また、燃料タンク１の内部には、図３に示すような、内蔵部品２０が取付けられている。
A built-in component mounting structure of an automobile fuel tank 1 according to an embodiment of the present invention will be described with reference to FIGS.
In the embodiment of the present invention, as shown in FIG. 1, the fuel tank 1 has a pump unit mounting hole 4 formed on the upper surface so that a fuel pump (not shown) and the like can be taken in and out of the fuel tank 1. . A fuel injection hole 5 for injecting fuel from an inlet pipe (not shown) is formed on the side surface or the upper surface of the fuel tank 1. Further, a built-in component 20 as shown in FIG. 3 is attached inside the fuel tank 1.
また、燃料タンク１の周囲には外周リブ２が全周に亘り形成されており、外周リブ２のコーナー部等の所定箇所には、数箇所に亘り取付用孔３が形成され、取付用孔３と車体をボルト締めすることにより、燃料タンク１を車体に取付けている。取付用孔３ではなく、燃料タンク１の外周にベルトをかけてそのベルトにより燃料タンク１を車体に取り付けることもできる。
さらに、燃料タンク１の上面には、内部の燃料蒸気を回収するホース等を接続する各所の取付孔６が形成されている。
An outer peripheral rib 2 is formed around the entire circumference of the fuel tank 1, and mounting holes 3 are formed at predetermined locations such as corner portions of the outer peripheral rib 2. The fuel tank 1 is attached to the vehicle body by bolting 3 and the vehicle body. It is also possible to attach a belt to the outer periphery of the fuel tank 1 instead of the attachment hole 3 and attach the fuel tank 1 to the vehicle body by the belt.
Furthermore, on the upper surface of the fuel tank 1, there are formed attachment holes 6 at various places for connecting a hose or the like for collecting the internal fuel vapor.
本実施の形態において、燃料タンク１は、ブロー成形で形成され、そのタンク外壁１０は、例えば、図２に示すように、外側から順に表皮層１１、外部本体層１２、外部接着剤層１３、バリヤ層１４、内部接着剤層１５及び内部本体層１６から形成されている。後述する内蔵部品２０は、内部本体層１６に溶着される。内蔵部品２０と内部本体層１６は、溶着しやすい材料、例えば同じ種類の材料を使用することが好ましい。また、タンク外壁１０は、１層又は６層以外の多層とすることができる。 In the present embodiment, the fuel tank 1 is formed by blow molding, and the tank outer wall 10 includes, for example, a skin layer 11, an external body layer 12, an external adhesive layer 13, in order from the outside, as shown in FIG. The barrier layer 14, the internal adhesive layer 15, and the internal body layer 16 are formed. A built-in component 20 to be described later is welded to the inner main body layer 16. The built-in component 20 and the inner main body layer 16 are preferably made of a material that is easily welded, for example, the same type of material. The tank outer wall 10 may be a single layer or a multilayer other than six layers.
ブロー成形においては、円筒状のパリソン８の内部に内蔵部品２０を挿入する場合や、円筒状のパリソン８を切り開いて平板状にして、ブロー成形金型４０を開いて、両側のキャビティー面に取付けて、その平板状のパリソン８に内蔵部品２０を取付ける場合もある。
ブロー成形のパリソン８は、上記の６層から構成されるパリソン８が使用される。６層以上の層構成を有するパリソン８を使用することもできる。また、表皮層１１は外部本体層１２に再生部材や、フィラー等を混入する場合に使用されるが、表皮層１１を省略することもできる。さらに、剛性と耐燃料油性を有する材料を使用すれば、１層構成のパリソンを使用することもできる。
In the blow molding, when the built-in component 20 is inserted into the cylindrical parison 8, or the cylindrical parison 8 is cut and flattened, the blow mold 40 is opened, and the cavity surfaces on both sides are opened. The built-in component 20 may be attached to the flat parison 8 by attaching.
As the blow molded parison 8, the parison 8 composed of the above six layers is used. A parison 8 having a layer configuration of six layers or more can also be used. In addition, the skin layer 11 is used when a reproducing member, a filler, or the like is mixed in the external main body layer 12, but the skin layer 11 can be omitted. Further, if a material having rigidity and fuel oil resistance is used, a one-layer parison can be used.
表皮層１１、外部本体層１２は、耐衝撃性が大きく、燃料油に対しても剛性が維持される熱可塑性合成樹脂から形成され、高密度ポリエチレン（ＨＤＰＥ）から形成されることが好ましい。外部本体層１２が、無機フィラーを含有した場合には、外部本体層１２の表面を覆うため、表皮層１１が使用され、表面に無機フィラーが出ることがなく、表面を円滑にすることができる。 The skin layer 11 and the outer main body layer 12 are formed of a thermoplastic synthetic resin that has high impact resistance and maintains rigidity against fuel oil, and is preferably formed of high-density polyethylene (HDPE). When the outer main body layer 12 contains an inorganic filler, the outer skin layer 11 is used to cover the surface of the outer main body layer 12, and the surface can be smoothed without any inorganic filler appearing on the surface. .
燃料タンク１の内部には、内蔵部品２０が取付けられている。内蔵部品２０の取付け方法については後述する。内蔵部品２０の第１〜第３の実施の形態についてについて、図３〜図２０に基づき説明する。
まず、第１の実施の形態の内蔵部品２０とタンク外壁１０に取付けられた状態について、図３〜図８に基づき説明する。第２と３の実施の形態の内蔵部品２０とタンク外壁１０に取付けられた状態については、後述する。
A built-in component 20 is attached inside the fuel tank 1. A method for attaching the built-in component 20 will be described later. The first to third embodiments of the built-in component 20 will be described with reference to FIGS.
First, the built-in component 20 and the state attached to the tank outer wall 10 of the first embodiment will be described with reference to FIGS. The state of being attached to the built-in component 20 and the tank outer wall 10 in the second and third embodiments will be described later.
内蔵部品２０は、ポリアセタール、高密度ポリエチレン（ＨＤＰＥ）等の耐燃料油性の熱可塑性合成樹脂で形成することができる。これにより燃料タンク１の強度を向上させることができるとともに、燃料タンク１の内部に取付けられても、燃料油による膨潤等で剛性が低下することがない。さらに、燃料タンク１のタンク外壁１０と同種類の材料を使用すれば、内蔵部品２０とタンク外壁１０が強固に溶着できる。 The built-in component 20 can be formed of a fuel oil-resistant thermoplastic synthetic resin such as polyacetal or high-density polyethylene (HDPE). As a result, the strength of the fuel tank 1 can be improved, and even if the fuel tank 1 is attached to the inside of the fuel tank 1, the rigidity does not decrease due to swelling by the fuel oil or the like. Furthermore, if the same type of material as the tank outer wall 10 of the fuel tank 1 is used, the built-in component 20 and the tank outer wall 10 can be firmly welded.
第１の実施の形態の内蔵部品２０には、タンク外壁１０の上下の内面に融着して内蔵部品２０」を取付ける上部当接部２１と下部当接部２２が設けられている。上部当接部２１は、タンク外壁１０の上面と溶着する上部溶着面２１ａが形成され、下部当接部２２は、タンク外壁１０の下面と溶着する下部溶着面２２ａが形成される。
上部溶着面２１ａと下部溶着面２２ａは、平面的に形成され、タンク外壁１０の上下の内面に密着して、溶着される。
The built-in component 20 of the first embodiment is provided with an upper abutment portion 21 and a lower abutment portion 22 that are fused to the upper and lower inner surfaces of the tank outer wall 10 to attach the built-in component 20 ”. The upper contact portion 21 is formed with an upper welding surface 21 a that is welded to the upper surface of the tank outer wall 10, and the lower contact portion 22 is formed with a lower welding surface 22 a that is welded to the lower surface of the tank outer wall 10.
The upper welding surface 21 a and the lower welding surface 22 a are formed in a planar manner, and are in close contact with the upper and lower inner surfaces of the tank outer wall 10 to be welded.
上部当接部２１と下部当接部２２は、本体部２３で接続される。第１の実施の形態の内蔵部品２０では、本体部２３は、上部当接部２１の中心部と下部当接部２２の中心部を接続する棒状の中心軸２６と、上部当接部２１と下部当接部２２を接続する複数の板状の縦補強リブ２４と、縦補強リブ２４に縦補強リブ２４と直交するように形成された複数の板状の横補強リブ２５が設けられている。 The upper contact portion 21 and the lower contact portion 22 are connected by the main body portion 23. In the built-in component 20 according to the first embodiment, the main body 23 includes a rod-shaped central shaft 26 that connects the central portion of the upper contact portion 21 and the central portion of the lower contact portion 22, and the upper contact portion 21. A plurality of plate-like longitudinal reinforcing ribs 24 that connect the lower abutting portions 22 and a plurality of plate-like transverse reinforcing ribs 25 that are formed on the longitudinal reinforcing ribs 24 so as to be orthogonal to the longitudinal reinforcing ribs 24 are provided. .
中心軸２６は、棒状に形成されて、上部当接部２１と下部当接部２２を保持することができるとともに、棒状の中心軸２６であるため、１回の金型成形により上部当接部２１と下部当接部２２と同時に一体的に成形することができ、成形が容易である。
なお、中心軸２６は縦補強リブ２４を使用する場合は、省略することもできる。
The central shaft 26 is formed in a rod shape and can hold the upper contact portion 21 and the lower contact portion 22 and is the rod-shaped central shaft 26. Therefore, the upper contact portion is formed by a single molding process. 21 and the lower abutting portion 22 can be molded integrally at the same time, and molding is easy.
The central shaft 26 can be omitted when the vertical reinforcing rib 24 is used.
縦補強リブ２４は、図３〜図５に示すように、４枚の板状に中心軸２６から放射状に形成されている。縦補強リブ２４は、上端と下端が上部当接部２１と下部当接部２２と一体に形成され、中心軸２６側の側端は、中心軸２６と一体に形成され、外周側の側端は、中央部が凹んだ円弧状に形成されている。 As shown in FIGS. 3 to 5, the longitudinal reinforcing ribs 24 are formed radially from the central axis 26 in the form of four plates. The vertical reinforcing rib 24 has an upper end and a lower end formed integrally with the upper contact portion 21 and the lower contact portion 22, a side end on the central shaft 26 side formed integrally with the central shaft 26, and a side end on the outer peripheral side. Is formed in a circular arc shape with a recessed central portion.
本実施の形態では、縦補強リブ２４は４枚形成されているが、その数は２枚以上で適宜選択される。また、縦補強リブ２４は、垂直に形成されているが斜めに形成することもできる。複数の板状の縦補強リブ２４により、内蔵部品２０の本体部２３の縦方向の剛性を向上させることができる。 In the present embodiment, four vertical reinforcing ribs 24 are formed, but the number is appropriately selected with two or more. Further, the vertical reinforcing ribs 24 are formed vertically, but may be formed obliquely. The plurality of plate-like vertical reinforcing ribs 24 can improve the rigidity in the vertical direction of the main body 23 of the built-in component 20.
また、内蔵部品２０を成形するときに、板状の縦補強リブ２４であるため、１回の金型成形により上部当接部２１、下部当接部２２及び中心軸２６と合わせて成形することができ、成形が容易である。
なお、上記のように、縦補強リブ２４のみで縦方向に剛性が十分な場合は、中心軸２６を形成せずに、縦補強リブ２４のみを形成することができる。
Further, when the built-in component 20 is molded, since it is the plate-like longitudinal reinforcing rib 24, it is molded together with the upper abutting portion 21, the lower abutting portion 22 and the central shaft 26 by one molding. Can be formed easily.
As described above, when only the vertical reinforcing rib 24 is sufficient in the vertical direction, only the vertical reinforcing rib 24 can be formed without forming the central shaft 26.
更に、縦補強リブ２４に縦補強リブ２４と直交するように形成された複数の板状の横補強リブ２５が設けられている。本実施の形態では、横補強リブ２５は、４枚形成されているが、その枚数は１枚以上適宜選択することができる。横補強リブ２５は、円盤状に形成され、縦補強リブ２４と中心軸２６と一体的に形成されている。 Further, a plurality of plate-like horizontal reinforcing ribs 25 formed so as to be orthogonal to the vertical reinforcing ribs 24 are provided on the vertical reinforcing ribs 24. In the present embodiment, four lateral reinforcing ribs 25 are formed, but one or more can be selected as appropriate. The horizontal reinforcing rib 25 is formed in a disc shape, and is formed integrally with the vertical reinforcing rib 24 and the central shaft 26.
横補強リブ２５を形成することにより、縦補強リブ２４と中心軸２６の捩じり方向の剛性を向上させることができ、横補強リブ２５、縦補強リブ２４と中心軸２６が合わせて、燃料タンク１への衝撃を確実に吸収することができる。また、上部当接部２１、下部当接部２２、縦補強リブ２４、横補強リブ２５及び中心軸２６を同時に、１回の金型成形により成形することができ、成形が容易である。 By forming the horizontal reinforcing rib 25, the rigidity in the torsional direction of the vertical reinforcing rib 24 and the central shaft 26 can be improved, and the horizontal reinforcing rib 25, the vertical reinforcing rib 24, and the central shaft 26 are combined to form a fuel. The impact on the tank 1 can be reliably absorbed. Further, the upper abutment portion 21, the lower abutment portion 22, the vertical reinforcing rib 24, the lateral reinforcing rib 25, and the central shaft 26 can be simultaneously formed by a single mold forming, so that the forming is easy.
次に、図６〜図８に基づき、第１の実施の形態の内蔵部品２０を燃料タンク１の内部に取付けた状態について説明する。
図６〜図８に示すように、燃料タンク１のタンク外壁１０は、上部壁と下部壁から対向するように、燃料タンク１内側に突出する外壁内面突出部１８が形成されている。外壁内面突出部１８の上部溶着面２１ａと下部溶着面２２ａと対向する面は、平面状の外壁内面溶着面１７が形成されている。このため、外壁内面突出部１８は、燃料タンク１のタンク外壁１０の他の部分よりも剛性が向上して、外部からの衝撃を吸収できる。
外壁内面溶着面１７は、内蔵部品２０の上部溶着面２１ａと下部溶着面２２ａと溶着される。
Next, a state where the built-in component 20 according to the first embodiment is attached to the inside of the fuel tank 1 will be described with reference to FIGS.
As shown in FIGS. 6 to 8, the tank outer wall 10 of the fuel tank 1 is formed with an outer wall inner surface protruding portion 18 that protrudes inside the fuel tank 1 so as to face the upper wall and the lower wall. A planar outer wall inner surface welding surface 17 is formed on a surface of the outer wall inner surface protruding portion 18 facing the upper welding surface 21a and the lower welding surface 22a. For this reason, the outer wall inner surface protruding portion 18 is more rigid than the other portion of the tank outer wall 10 of the fuel tank 1 and can absorb an impact from the outside.
The outer wall inner surface welding surface 17 is welded to the upper welding surface 21 a and the lower welding surface 22 a of the built-in component 20.
図７と図８に示すように、外壁内面溶着面１７は、上部溶着面２１ａと下部溶着面２２ａよりも小さく形成されているとともに、上部溶着面２１ａと下部溶着面２２ａが外壁内面溶着面１７よりも横方向の外周側にスペースができるように形成されている。このため、上部溶着面２１ａと下部溶着面２２ａを外壁内面溶着面１７に溶着したときに、溶着部分から押出されて横方向にはみ出した溶融はみ出し部が上部溶着面２１ａと下部溶着面２２ａ側に生じて、外部からの低温衝撃が加わっても、燃料タンク１のタンク外壁１０に損傷が生じることがない。 As shown in FIGS. 7 and 8, the outer wall inner surface 17 is formed to be smaller than the upper surface 21 a and the lower surface 22 a, and the upper surface 21 a and the lower surface 22 a are the outer wall inner surface 17. It is formed so that a space is formed on the outer peripheral side in the lateral direction. For this reason, when the upper welding surface 21a and the lower welding surface 22a are welded to the outer wall inner surface welding surface 17, the molten protruding portion that is pushed out from the welding portion and protrudes in the lateral direction is located on the upper welding surface 21a and the lower welding surface 22a side. Even if a low temperature impact is applied from the outside, the tank outer wall 10 of the fuel tank 1 is not damaged.
内蔵部品２０を燃料タンク１の外壁内面溶着面１７に取付けると、中心軸２６と縦補強リブ２４が上部溶着面２１ａと下部溶着面２２ａを保持して、外壁内面突出部１８から受ける燃料タンク１からの衝撃を吸収することができるとともに、燃料タンク１のタンク外壁１０が膨張や収縮したときも、縦補強リブ２４や中心軸２６が外壁内面突出部１８を保持して、タンク外壁１０の上部壁と下部壁を刺させてタンク外壁１０が過度に膨張や収縮することを防止できる。
また、タンク外壁１０がねじれても、横補強リブ２５がタンク外壁１０のねじれを防止できる。
When the built-in component 20 is attached to the outer wall inner surface welding surface 17 of the fuel tank 1, the center axis 26 and the longitudinal reinforcing rib 24 hold the upper welding surface 21a and the lower welding surface 22a and receive the fuel tank 1 from the outer wall inner surface protruding portion 18. When the tank outer wall 10 of the fuel tank 1 expands or contracts, the vertical reinforcing rib 24 and the central shaft 26 hold the outer wall inner surface protruding portion 18 so that the upper portion of the tank outer wall 10 can be absorbed. It is possible to prevent the tank outer wall 10 from excessively expanding and contracting by piercing the wall and the lower wall.
Even if the tank outer wall 10 is twisted, the lateral reinforcing rib 25 can prevent the tank outer wall 10 from being twisted.
次に、第２の実施の形態の内蔵部品２０とタンク外壁１０に取付けられた状態について、図９〜図１４に基づき説明する。図９〜図１１に示すように、第２実施の形態の内蔵部品２０は、第１の実施の形態の内蔵部品２０他は、横補強リブ２５がないことが異なり、他の部分は同じであるため、異なる部分を説明し、同様な部分の説明は省略する。 Next, the state of being attached to the built-in component 20 and the tank outer wall 10 according to the second embodiment will be described with reference to FIGS. As shown in FIGS. 9 to 11, the built-in component 20 according to the second embodiment is different from the built-in component 20 according to the first embodiment in that the lateral reinforcing rib 25 is not provided, and other portions are the same. Therefore, different parts will be described, and description of similar parts will be omitted.
第２の実施の形態の内蔵部品２０には、タンク外壁１０の上下の内面に融着して内蔵部品２０」を取付ける上部当接部２１と下部当接部２２が設けられている。
上部当接部２１と下部当接部２２は、本体部２３で接続される。第２の実施の形態の内蔵部品２０では、本体部２３は、上部当接部２１の中心部と下部当接部２２の中心部を接続する棒状の中心軸２６と、上部当接部２１と下部当接部２２を接続する複数の板状の縦補強リブ２４が設けられている。横補強リブ２５は、設けられていない。
The built-in component 20 of the second embodiment is provided with an upper abutment portion 21 and a lower abutment portion 22 that are attached to the upper and lower inner surfaces of the tank outer wall 10 to attach the built-in component 20 ”.
The upper contact portion 21 and the lower contact portion 22 are connected by the main body portion 23. In the built-in component 20 according to the second embodiment, the main body 23 includes a rod-shaped central shaft 26 that connects the central portion of the upper contact portion 21 and the central portion of the lower contact portion 22, and the upper contact portion 21. A plurality of plate-like longitudinal reinforcing ribs 24 for connecting the lower contact portions 22 are provided. The lateral reinforcing rib 25 is not provided.
中心軸２６は、棒状に形成されて、上部当接部２１と下部当接部２２を保持することができるとともに、棒状の中心軸２６であるため、１回の金型成形により上部当接部２１と下部当接部２２と同時に成形することができ、成形が容易である。
なお、中心軸２６は縦補強リブ２４を使用する場合は、省略することもできる。
The central shaft 26 is formed in a rod shape and can hold the upper contact portion 21 and the lower contact portion 22 and is the rod-shaped central shaft 26. Therefore, the upper contact portion is formed by a single molding process. 21 and the lower abutting portion 22 can be molded simultaneously, and molding is easy.
The central shaft 26 can be omitted when the vertical reinforcing rib 24 is used.
縦補強リブ２４は、図９〜図１１に示すように、４枚の板状に中心軸２６から放射状に形成されている。縦補強リブ２４は、上端と下端が上部当接部２１と下部当接部２２と一体に形成され、中心軸２６側の側端は、中心軸２６と一体に形成され、外周側の側端は、中央部が凹んだ円弧状に形成されている。
縦補強リブ２４により、横補強リブ２５がなくても、上部当接部２１と下部当接部２２を保持する剛性を向上させることができる。また、横補強リブ２５がないため、金型構造が複雑でなく、成形性も向上できる。
As shown in FIGS. 9 to 11, the vertical reinforcing ribs 24 are formed radially from the central shaft 26 in the form of four plates. The vertical reinforcing rib 24 has an upper end and a lower end formed integrally with the upper contact portion 21 and the lower contact portion 22, a side end on the central shaft 26 side formed integrally with the central shaft 26, and a side end on the outer peripheral side. Is formed in a circular arc shape with a recessed central portion.
The vertical reinforcing ribs 24 can improve the rigidity for holding the upper contact portions 21 and the lower contact portions 22 without the horizontal reinforcing ribs 25. Further, since there is no lateral reinforcing rib 25, the mold structure is not complicated and the moldability can be improved.
次に、図１２〜図１４に基づき、第２の実施の形態の内蔵部品２０を燃料タンク１の内部に取付けた状態について説明する。
燃料タンク１のタンク外壁１０は、燃料タンク１内側に突出する外壁内面突出部１８が形成されている。外壁内面突出部１８の上部溶着面２１ａと下部溶着面２２ａと対向する面は、平面状の外壁内面溶着面１７が形成されている。
Next, a state in which the built-in component 20 according to the second embodiment is attached to the inside of the fuel tank 1 will be described with reference to FIGS.
The tank outer wall 10 of the fuel tank 1 is formed with an outer wall inner surface protruding portion 18 that protrudes to the inside of the fuel tank 1. A planar outer wall inner surface welding surface 17 is formed on a surface of the outer wall inner surface protruding portion 18 facing the upper welding surface 21a and the lower welding surface 22a.
図１３と図１４に示すように、外壁内面溶着面１７は、上部溶着面２１ａと下部溶着面２２ａよりも小さく形成されているとともに、上部溶着面２１ａと下部溶着面２２ａが外壁内面溶着面１７よりも横方向の外周側にスペースができるように形成されている。このため、上部溶着面２１ａと下部溶着面２２ａを外壁内面溶着面１７に溶着したときに、溶着部分から押出されて横方向にはみ出した溶融はみ出し部が上部溶着面２１ａと下部溶着面２２ａ側に生じて、外部からの低温衝撃が加わっても、燃料タンク１のタンク外壁１０に損傷が生じることがない。 As shown in FIGS. 13 and 14, the outer wall inner surface 17 is formed smaller than the upper surface 21 a and the lower surface 22 a, and the upper surface 21 a and the lower surface 22 a are the outer wall inner surface 17. It is formed so that a space is formed on the outer peripheral side in the lateral direction. For this reason, when the upper welding surface 21a and the lower welding surface 22a are welded to the outer wall inner surface welding surface 17, the molten protruding portion that is pushed out from the welding portion and protrudes in the lateral direction is located on the upper welding surface 21a and the lower welding surface 22a side. Even if a low temperature impact is applied from the outside, the tank outer wall 10 of the fuel tank 1 is not damaged.
内蔵部品２０を燃料タンク１の外壁内面溶着面１７に取付けると、中心軸２６と縦補強リブ２４が上部溶着面２１ａと下部溶着面２２ａを保持して、外壁内面突出部１８から受ける燃料タンク１からの衝撃を吸収することができるとともに、燃料タンク１のタンク外壁１０が膨張や収縮したときも、縦補強リブ２４や中心軸２６が外壁内面突出部１８を保持して、タンク外壁１０の上部壁と下部壁を支えて、タンク外壁１０が過度に膨張や収縮することを防止できる。 When the built-in component 20 is attached to the outer wall inner surface welding surface 17 of the fuel tank 1, the center axis 26 and the longitudinal reinforcing rib 24 hold the upper welding surface 21a and the lower welding surface 22a and receive the fuel tank 1 from the outer wall inner surface protruding portion 18. When the tank outer wall 10 of the fuel tank 1 expands or contracts, the vertical reinforcing rib 24 and the central shaft 26 hold the outer wall inner surface protruding portion 18 so that the upper portion of the tank outer wall 10 can be absorbed. By supporting the wall and the lower wall, the tank outer wall 10 can be prevented from excessively expanding and contracting.
次に、第３の実施の形態の内蔵部品２０とタンク外壁１０に取付けられた状態について、図１５〜図２０に基づき説明する。図１５〜図１７に示すように、第３の実施の形態の内蔵部品２０は、第１の実施の形態の内蔵部品２０他は、縦補強リブ２４と横補強リブ２５がないことが異なり、他の部分は同じであるため、異なる部分を説明し、同様な部分の説明は省略する。 Next, the state of being attached to the built-in component 20 and the tank outer wall 10 according to the third embodiment will be described with reference to FIGS. As shown in FIGS. 15 to 17, the built-in component 20 of the third embodiment is different from the built-in component 20 of the first embodiment except that the vertical reinforcing rib 24 and the horizontal reinforcing rib 25 are not provided. Since other parts are the same, different parts will be described, and description of similar parts will be omitted.
第３の実施の形態の内蔵部品２０には、タンク外壁１０の上下の内面に融着して内蔵部品２０」を取付ける上部当接部２１と下部当接部２２が設けられている。
上部当接部２１と下部当接部２２は、本体部２３で接続される。第３の実施の形態の内蔵部品２０では、本体部２３は、上部当接部２１の中心部と下部当接部２２の中心部を接続する棒状の中心軸２６である。縦補強リブ２４と横補強リブ２５は、設けられていない。
The built-in component 20 of the third embodiment is provided with an upper abutment portion 21 and a lower abutment portion 22 that are attached to the upper and lower inner surfaces of the tank outer wall 10 to attach the built-in component 20 ”.
The upper contact portion 21 and the lower contact portion 22 are connected by the main body portion 23. In the built-in component 20 of the third embodiment, the main body portion 23 is a rod-shaped central shaft 26 that connects the central portion of the upper contact portion 21 and the central portion of the lower contact portion 22. The vertical reinforcing rib 24 and the horizontal reinforcing rib 25 are not provided.
中心軸２６は、棒状に形成されて、上部当接部２１と下部当接部２２を保持することができるとともに、棒状の中心軸２６であるため、１回の金型成形により上部当接部２１と下部当接部２２と同時に成形することができ、縦補強リブ２４と横補強リブ２５を有し無いため、金型構造が単純化して、成形が容易である。 The central shaft 26 is formed in a rod shape and can hold the upper contact portion 21 and the lower contact portion 22 and is the rod-shaped central shaft 26. Therefore, the upper contact portion is formed by a single molding process. 21 and the lower abutting portion 22 can be molded simultaneously, and the vertical reinforcing ribs 24 and the lateral reinforcing ribs 25 are not provided, so that the mold structure is simplified and the molding is easy.
次に、図１８〜図２０に基づき、第３の実施の形態の内蔵部品２０を燃料タンク１の内部に取付けた状態について説明する。
燃料タンク１のタンク外壁１０は、燃料タンク１内側に突出する外壁内面突出部１８が形成されている。外壁内面突出部１８の上部溶着面２１ａと下部溶着面２２ａと対向する面は、平面状の外壁内面溶着面１７が形成されている。
Next, a state where the built-in component 20 according to the third embodiment is attached to the inside of the fuel tank 1 will be described with reference to FIGS.
The tank outer wall 10 of the fuel tank 1 is formed with an outer wall inner surface protruding portion 18 that protrudes to the inside of the fuel tank 1. A planar outer wall inner surface welding surface 17 is formed on a surface of the outer wall inner surface protruding portion 18 facing the upper welding surface 21a and the lower welding surface 22a.
内蔵部品２０を燃料タンク１の外壁内面溶着面１７に取付けると、中心軸２６が上部溶着面２１ａと下部溶着面２２ａを保持して、外壁内面突出部１８から受ける燃料タンク１からの衝撃を吸収することができるとともに、燃料タンク１のタンク外壁１０が膨張や収縮したときも、中心軸２６が外壁内面突出部１８を保持して、タンク外壁１０の上部壁と下部壁を支えて、タンク外壁１０が過度に膨張や収縮することを防止できる。 When the built-in component 20 is attached to the outer wall inner surface welding surface 17 of the fuel tank 1, the central shaft 26 holds the upper welding surface 21 a and the lower welding surface 22 a to absorb the impact from the fuel tank 1 received from the outer wall inner surface protrusion 18. When the tank outer wall 10 of the fuel tank 1 expands or contracts, the central shaft 26 holds the outer wall inner surface protruding portion 18 to support the upper wall and the lower wall of the tank outer wall 10, 10 can be prevented from excessively expanding and contracting.
次に、ブロー成形による本件発明の燃料タンク１の製造方法を、図２１〜図２３に基づき説明する。
まず、図２１に示すように、内蔵部品２０を支持棒４１に保持して、ブロー成形金型４０が開いた内部に位置させる。その後、パリソン８を下降させて、内蔵部品２０をパリソン８の内部に位置させる。
Next, a method for manufacturing the fuel tank 1 of the present invention by blow molding will be described with reference to FIGS.
First, as shown in FIG. 21, the built-in component 20 is held by the support rod 41 and is positioned inside the blow molding die 40. Thereafter, the parison 8 is lowered and the built-in component 20 is positioned inside the parison 8.
そして、図２２に示すように、第１ピンチ板４３をスライドさせて、パリソン８の下端を支持棒４１とともに挟持する。それとともに、ブロー成形金型４０に設けられた複数の押圧ピン４２をスライドさせて、パリソン８を内蔵部品２０と押圧ピン４２で挟むように押圧する。 Then, as shown in FIG. 22, the first pinch plate 43 is slid to hold the lower end of the parison 8 together with the support bar 41. At the same time, the plurality of pressing pins 42 provided on the blow molding die 40 are slid to press the parison 8 so as to be sandwiched between the built-in component 20 and the pressing pins 42.
そうすると、パリソン８の内面はまだ溶融状態にあるため、上述のように、内蔵部品２０の上部溶着面２１ａと下部溶着面２２ａがパリソン８と融着することができる。このとき、内蔵部品２０は、支持棒４１により保持されているので、内蔵部品２０は、燃料タンク１のタンク外壁１０の所定の位置に確実に取付けられることができる。
また、上部溶着面２１ａと下部溶着面２２ａを予め加熱して溶融状態として、溶着強度を向上させることができる。
Then, since the inner surface of the parison 8 is still in a molten state, the upper welding surface 21a and the lower welding surface 22a of the built-in component 20 can be fused to the parison 8 as described above. At this time, since the built-in component 20 is held by the support bar 41, the built-in component 20 can be reliably attached to a predetermined position of the tank outer wall 10 of the fuel tank 1.
Moreover, the upper welding surface 21a and the lower welding surface 22a can be heated in advance to be in a molten state, thereby improving the welding strength.
その後、図２３に示すように、支持棒４１を下降させてブロー成形金型４０から抜き、第２ピンチ板４４をスライドさせてパリソン８を閉じるとともに、ブロー成形金型４０を閉じて、スライドカッター４６でパリソン８を切断する。ブロー成形金型４０を閉じるときには、押圧ピン４２は、そのままパリソン８を押圧続ける。これにより、内蔵部品２０を所定位置に保持し続けることができる。 After that, as shown in FIG. 23, the support bar 41 is lowered and removed from the blow molding die 40, the second pinch plate 44 is slid to close the parison 8, and the blow molding die 40 is closed to slide the cutter. At 46, the parison 8 is cut. When closing the blow molding die 40, the pressing pin 42 continues to press the parison 8 as it is. Thereby, the built-in component 20 can be kept in a predetermined position.
そして、エアノズル４５からパリソン８の内部に空気を吹き込み、パリソン８の外面をブロー成形金型４０に押圧して、燃料タンク１を形成する。このとき、押圧ピン４２の先端面とブロー成形金型４０のキャビティー内面とは同一平面になることができる。
その後、ブロー成形金型４０を開き、燃料タンク１を取出す。
Then, air is blown into the inside of the parison 8 from the air nozzle 45, and the outer surface of the parison 8 is pressed against the blow molding die 40 to form the fuel tank 1. At this time, the front end surface of the pressing pin 42 and the cavity inner surface of the blow molding die 40 can be flush with each other.
Thereafter, the blow molding die 40 is opened and the fuel tank 1 is taken out.
１ 燃料タンク
１０ 外壁
１７ 外壁内面融着部
１８ 外壁内面突出部
２０ 内蔵部品
２１ 上部当接部
２２ 下部当接部
２３ 本体部
２４ 縦補強リブ
２５ 横補強リブ
２６ 中心軸
DESCRIPTION OF SYMBOLS 1 Fuel tank 10 Outer wall 17 Outer wall inner surface fusion | fusion part 18 Outer wall inner surface protrusion part 20 Built-in component 21 Upper contact part 22 Lower contact part 23 Main-body part 24 Vertical reinforcement rib 25 Horizontal reinforcement rib 26 Center axis
Claims (7)
上記内蔵部品は、上記燃料タンクのタンク外壁の上下の内面に融着して上記内蔵部品を取付ける上部当接部と下部当接部、及び該上部当接部と下部当接部を接続する本体部を有し、
上記上部当接部と下部当接部は、それぞれ上記タンク外壁の内面に溶着される上部溶着面と下部溶着面を有し、
上記タンク外壁は、上記燃料タンク内側に突出する外壁内面突出部が形成され、上記外壁内面突出部の上記上部溶着面と下部溶着面と対向する面は、平面状の外壁内面溶着面が形成されたことを特徴とする自動車用燃料タンクの内蔵部品の取付構造。 In the built-in component mounting structure of a fuel tank for automobiles, which has a tank outer wall formed with a synthetic resin and has a built-in component inside,
The built-in component includes an upper abutment portion and a lower abutment portion that are fused to the upper and lower inner surfaces of the tank outer wall of the fuel tank, and a main body that connects the upper abutment portion and the lower abutment portion. Part
The upper contact portion and the lower contact portion each have an upper weld surface and a lower weld surface that are welded to the inner surface of the tank outer wall,
The tank outer wall is formed with an outer wall inner surface protruding portion that protrudes to the inside of the fuel tank, and a flat outer wall inner surface is formed on the surface of the outer wall inner surface protruding from the upper and lower welding surfaces. A mounting structure for a built-in part of a fuel tank for an automobile characterized by the above.
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