JP7249085B2 - Saddle-shaped resin fuel tank - Google Patents

Saddle-shaped resin fuel tank Download PDF

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JP7249085B2
JP7249085B2 JP2019008313A JP2019008313A JP7249085B2 JP 7249085 B2 JP7249085 B2 JP 7249085B2 JP 2019008313 A JP2019008313 A JP 2019008313A JP 2019008313 A JP2019008313 A JP 2019008313A JP 7249085 B2 JP7249085 B2 JP 7249085B2
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saddle
fuel tank
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resin fuel
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貴泰 嶋田
祐児 清水
勝也 真鍋
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FTS Co Ltd
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Description

本発明は、成形サイクル時間を短縮する、特に、鞍型の樹脂製の燃料タンクに関する。 The present invention particularly relates to a saddle-shaped resin fuel tank that reduces molding cycle time.

自動車の燃料タンクとして、軽量化と車内空間の拡大に寄与する樹脂製のものが利用され、この樹脂製燃料タンクは、主にブロー成形により製造されている。また、材料としては、高密度ポリエチレン（ＨＤＰＥ）を主材とし、燃料の透過性の極めて少ないバリヤ層には、例えば、エチレン－ビニルアルコール共重合体（ＥｖＯＨ）を使用している。そして、その構造は、燃料タンクの内側から、主材／接着材層／バリヤ層／接着材層／主材の３種５層や、主材／接着材層／バリヤ層／接着材層／再生材層／主材構造の４種６層の構造となっている。燃料タンク内には、バルブ類や燃料の流動音を抑制するためのバッフルプレート等の内蔵部品を設ける場合がある。 BACKGROUND ART Resin fuel tanks are used as fuel tanks for automobiles because they contribute to weight reduction and expansion of the interior space of the vehicle. These resin fuel tanks are mainly manufactured by blow molding. As for the material, high-density polyethylene (HDPE) is used as the main material, and ethylene-vinyl alcohol copolymer (EvOH), for example, is used for the barrier layer with extremely low fuel permeability. And the structure is, from the inside of the fuel tank, 5 layers of 3 types of main material / adhesive layer / barrier layer / adhesive layer / main material, main material / adhesive layer / barrier layer / adhesive layer / recycled It has a structure of 4 types and 6 layers of material layer / main material structure. Internal parts such as valves and baffle plates for suppressing fuel flow noise may be provided in the fuel tank.

ブロー成形による樹脂製燃料タンクの製造方法としては、特許文献１によれば、開閉面に樹脂成型品を形成するキャビティが形成され、パーティングラインで分割された成形割金型を用い、上記成形割金型をパーティングラインで開き、パリソンをダイコアから中空状に押出して、キャビティ上に配置した後に、パリソンの間に内蔵部品を取付けた内蔵部品保持装置を挿入し、内蔵部品をパリソンの内面に取付け、内蔵部品保持装置を抜去の後に成形割金型を閉じてブロー成形を行う方法が開示されている。 As a method for manufacturing a resin fuel tank by blow molding, according to Patent Document 1, a split mold having a cavity for forming a resin molded product is formed on an opening and closing surface and divided by a parting line, and the above molding is performed. The split mold is opened at the parting line, the parison is extruded from the die core in a hollow shape, and after placing it on the cavity, the built-in part holding device with the built-in parts attached is inserted between the parisons, and the built-in parts are held on the inner surface of the parison. A method is disclosed in which blow molding is performed by closing the split mold after removing the built-in part holding device.

一方、ブロー成形は、パリソン等の被成形体を成形する際に、被成形体の外側に金型が接しているので、成形後に被成形体の冷却に長い時間を要し、効率的に冷却することが難しい課題を有していた。そこで、特許文献２には、図５に示すように、クロスヘッド５００から吐出されるパリソン又はパリソンを切断した一対のシート又は一対のシートからなる被成形体５１０の内側に内側冷却用金型５２０を挿入した状態（Ａ）で、被成形体５１０の外側に位置する外側金型５３０を閉じ（Ｂ）、被成形体５１０を冷却後、外側金型５３０を開き（Ｃ）、内側冷却用金型５２０を被成形体５１０の内側から離脱させ（Ｄ）、その後、再び外側金型５３０を閉じて被成形体５１０を成形する（Ｅ）ことにより、成形サイクル時間を短縮する方法が開示されている。 On the other hand, in blow molding, since the mold is in contact with the outside of the object to be molded, such as a parison, it takes a long time to cool the object after molding. had a difficult task. Therefore, in Patent Document 2, as shown in FIG. 5, an inner cooling mold 520 is provided inside a molded body 510 composed of a parison discharged from a crosshead 500 or a pair of sheets obtained by cutting the parison or a pair of sheets. is inserted (A), the outer mold 530 located outside the molded body 510 is closed (B), the molded body 510 is cooled, the outer mold 530 is opened (C), and the inner cooling metal A method is disclosed for shortening the molding cycle time by removing the mold 520 from the inside of the molded article 510 (D), and then closing the outer mold 530 again to mold the molded article 510 (E). there is

ところで、一般に、自動車のフロントエンジン・リアドライブ方式のＦＲ車や、４輪駆動（４ＷＤ、ＡＷＤ）車では、エンジンの駆動力をリア・デファレンシャル・ギアボックスへ伝達するプロペラシャフトが車体下部に延在している。そして、駆動系統のバランスをとるためにプロペラシャフトは通常、車体センターに配置される。そのため、後部座席の下等に配置される燃料タンクは、プロペラシャフトと干渉しないように、タンク底面の略中央部を上方に突出させて燃料室を左右に分割させた、いわゆる鞍型状に形成される。 By the way, in general, in front-engine, rear-drive type FR vehicles and four-wheel drive (4WD, AWD) vehicles, a propeller shaft that transmits the driving force of the engine to the rear differential gearbox extends at the bottom of the vehicle body. are doing. And the propeller shaft is usually placed in the center of the vehicle body to balance the driveline. For this reason, the fuel tank, which is placed under the rear seats, is formed in a so-called saddle shape, in which the fuel chamber is divided into left and right parts by protruding approximately in the center of the bottom surface of the tank so as not to interfere with the propeller shaft. be done.

図６に示すように、車両に搭載される鞍型の樹脂製燃料タンク１００は、樹脂製燃料タンク１００の下部壁部１２０の中央部１４０が上方に円弧状に突出した鞍状部２００と、鞍状部２００を挟んで車幅方向に、燃料を貯留する第１室３００および第２室４００から構成されている（特許文献３）。 As shown in FIG. 6, a saddle-shaped resin fuel tank 100 mounted on a vehicle includes a saddle-shaped portion 200 in which a central portion 140 of a lower wall portion 120 of the resin fuel tank 100 projects upward in an arc shape; It is composed of a first chamber 300 and a second chamber 400 that store fuel in the vehicle width direction with the saddle portion 200 interposed therebetween (Patent Document 3).

なお、鞍型の樹脂製燃料タンクにおける鞍状部２００の上部壁部１１０の断面形状については、図６に示すような、鞍状部２００の上部壁部１１０が、第１室３００の上部壁部１１０、および第２室４００の上部壁部１１０に対して鉛直方向に盛り上がっているタイプの他に、第１室の上部壁部、および第２室の上部壁部と略同一面を形成しているタイプや、鞍状部２００の上部壁部１１０が、第１室の上部壁部、および第２室の上部壁部に比べて、鉛直方向に凹んでいるタイプがある。 Regarding the cross-sectional shape of the upper wall portion 110 of the saddle-shaped portion 200 in the saddle-shaped resin fuel tank, as shown in FIG. In addition to the type that rises in the vertical direction with respect to the upper wall portion 110 of the first chamber 400 and the upper wall portion 110 of the second chamber 400, the upper wall portion of the first chamber and the upper wall portion of the second chamber form substantially the same surface. and a type in which the upper wall portion 110 of the saddle portion 200 is recessed in the vertical direction compared to the upper wall portions of the first and second chambers.

特開２０１６－０４７６３５号公報JP 2016-047635 A 特開２０１２－２１８２１２号公報JP 2012-218212 A 特開２０１８－０９４９６７号公報JP 2018-094967 A

ところで、図６のような鞍型の樹脂製燃料タンク１００をブロー成形によって製造する場合、樹脂製燃料タンク１００の中央部１４０に形成される下部壁部１２０の深く絞られた領域１５０の、特に、頂部の弧状部１６０の膜厚が、パリソンの伸長度合いが局部的に異なることにより、他の部分に比較して厚く成形される。その結果、冷却時間が長くなり、成形時間が長くなる問題が発生した。 By the way, when the saddle-shaped resin fuel tank 100 as shown in FIG. , the film thickness of the top arcuate portion 160 is formed thicker than other portions due to the local difference in the degree of elongation of the parison. As a result, the cooling time becomes long, and the molding time becomes long.

上記の特許文献２における内側冷却用金型５２０を鞍型の樹脂製の燃料タンクに適用することは難しく、また、適用できたとしても内側冷却用金型５２０の費用およびそれを用いた成形時間などコストアップの要因になる。 It is difficult to apply the inner cooling mold 520 in Patent Document 2 to a saddle-shaped resin fuel tank. etc. will be a factor of cost increase.

そこで、本発明は、成形サイクル時間を短縮する鞍型の樹脂製の燃料タンクを提供することにある。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a saddle-shaped resin fuel tank that shortens the molding cycle time.

上記課題を解決するために請求項１の本発明は、車両に搭載された内燃機関に供給する燃料を、第１室および第２室の間に鞍状部を有する室内に貯留する鞍型の樹脂製燃料タンクであって、鞍状部には、断面において、車両の上下方向に関し、上方向側の山部と下方向側の谷部が交互に複数連続的に接続される波形状部を有し、前記鞍状部の前記波形状部は、前記鞍状部の深く絞られた領域の頂部の弧状部に形成されることを特徴とする鞍型の樹脂製燃料タンクである。 In order to solve the above-mentioned problems, the present invention of claim 1 is a saddle-type fuel tank in which fuel supplied to an internal combustion engine mounted on a vehicle is stored in a chamber having a saddle-shaped portion between a first chamber and a second chamber. In the resin fuel tank, the saddle-shaped portion has a corrugated portion in which a plurality of ridges on the upper side and troughs on the lower side are alternately and continuously connected with respect to the vertical direction of the vehicle in cross section. and wherein the corrugated portion of the saddle portion is formed in an arcuate portion at the top of the deeply constricted region of the saddle portion.

鞍型の樹脂製燃料タンクでは、プロペラシャフト等を跨ぐ関係上、鞍状部の下部壁部には、上方に突出した深く絞られた領域が形成され、プロペラシャフト等の断面形状を反映して、深く絞られた領域の上端部分（奥行き先端部分）、すなわち、頂部には弧状部が形成される。そして、この弧状部において膜厚が他の部分に比較して厚く形成される。
請求項１の本発明では、車両に搭載されたエンジン等の内燃機関に供給する燃料を、第１ 室および第２室の間に鞍状部を有する室内に貯留する鞍型の樹脂製燃料タンクであって、鞍状部には、断面において、車両の上下方向に関し、上方向側の山部と下方向側の谷部が交互に複数連続的に接続される波形状部を有し、鞍状部の波形状部は、鞍状部の深く絞られた領域の頂部の弧状部に形成されるので、パリソンの伸長度合いの局部的な変動が緩和される。その結果、樹脂製燃料タンクの略中央部の鞍状部に形成される深く絞られた領域の頂部の膜厚が他の部分とほぼ同じ膜厚まで伸ばされて薄くなり、さらに、波形状に形成されることにより、冷却される金型との接触面積が増加するので、冷却時間を短縮することができる。
また、波形状部により、樹脂製燃料タンクの略中央部の鞍状部に形成される深く絞られた領域の機械的強度が増大する。
ここで、波形状部における谷部と山部とは、波形状部における２つの頂部のうち、鞍型 の樹脂製燃料タンクを車両に搭載したときに、車体の上下方向に関し、車体の下方向側の 波形状部の頂部を谷部、車体の上方向側の波形状部の頂部を山部という。 In a saddle-shaped resin fuel tank, since it straddles the propeller shaft, etc., the lower wall of the saddle-shaped part is formed with a deeply constricted area that protrudes upward, reflecting the cross-sectional shape of the propeller shaft. , an arc-shaped portion is formed at the upper end portion (depth tip portion) of the deeply drawn region, that is, at the top. The thickness of the arc-shaped portion is formed thicker than that of other portions.
In the first aspect of the present invention, a saddle-shaped resin fuel tank stores fuel supplied to an internal combustion engine such as an engine mounted on a vehicle in a chamber having a saddle-shaped portion between the first chamber and the second chamber. The saddle portion has a corrugated portion in which a plurality of ridges on the upper side and troughs on the lower side are alternately and continuously connected with respect to the vertical direction of the vehicle . The corrugation of the saddle is formed in the arcuate portion at the top of the deeply drawn region of the saddle, so that local variations in the degree of elongation of the parison are mitigated. As a result, the film thickness at the top of the deeply constricted region formed in the substantially central saddle-shaped portion of the resin fuel tank is stretched to approximately the same film thickness as the other portions and becomes thinner, and furthermore, it becomes wavy. Since the contact area with the mold to be cooled is increased by being formed, the cooling time can be shortened.
In addition, the corrugated portion increases the mechanical strength of the deeply constricted region formed in the substantially central saddle portion of the resin fuel tank.
Here, the troughs and crests of the corrugated portion refer to the downward direction of the vehicle body when the saddle-shaped resin fuel tank is mounted on the vehicle. The crest of the corrugated portion on the side of the vehicle body is called the trough portion, and the crest portion of the corrugated portion on the upper side of the vehicle body is called the peak portion.

さらに、波形状部により、樹脂製燃料タンクの中央部の鞍状部に形成される深く絞られた領域の機械的強度が増大する結果、従前よりも高い温度で成形割金型を開いて、次工程、例えば、穴あけ加工、内蔵部品の取付等に移行することが可能になり、樹脂製燃料タンクの製造時間を短縮することができる。 Furthermore, the corrugated portion increases the mechanical strength of the deeply drawn region formed in the central saddle portion of the resin fuel tank. It is possible to proceed to the next process, such as drilling holes and mounting of built-in parts, so that the manufacturing time of the resin fuel tank can be shortened.

なお、波形状とは、波のように上下にうねる形をいい、波が伝わるときの一定の位置での物理量の時間的変化、または一定の時刻での物理量の空間的変化をグラフで示したもの、例えば、正弦波や三角波の他に、上に凸の円弧と下に凸の円弧が連続的に接続される形状をいう。 A wave shape is a shape that undulates up and down like a wave, and it is a graph showing the temporal change in physical quantity at a fixed position when the wave propagates, or the spatial change in physical quantity at a fixed time. For example, in addition to sine waves and triangular waves, it refers to a shape in which an upwardly convex circular arc and a downwardly convex circular arc are continuously connected.

請求項２の本発明は、鞍状部の波形状部における膜厚は、波形状部の谷部が波形状部の山部に比べて薄く形成されている鞍型の樹脂製燃料タンクである。請求項２の本発明では、鞍状部の波形状部における膜厚は、パリソンの伸長度合いの局部的な変動が緩和された結果、波形状部の谷部が波形状部の山部に比べて薄く形成されるので、波形状部内に断続的に薄肉部が形成され、冷却時間をさらに短縮することができる。なお、波形状部内に断続的に薄肉部が形成された場合であっても、波形状部によって、鞍状部の機械的強度が増大するので、鞍型の樹脂製燃料タンク全体としての剛性については問題ない。 According to a second aspect of the present invention, there is provided a saddle-shaped resin fuel tank in which the film thickness of the corrugated portion of the saddle is formed such that the troughs of the corrugated portion are thinner than the crests of the corrugated portion. . According to the second aspect of the present invention, the film thickness of the corrugated portion of the saddle portion is such that the troughs of the corrugated portion are smaller than the crests of the corrugated portion as a result of the local variation in the degree of elongation of the parison being relaxed. Since the corrugated portion is formed to be thin, intermittent thin portions are formed in the corrugated portion, and the cooling time can be further shortened. Even if thin portions are intermittently formed in the corrugated portion, the mechanical strength of the saddle portion increases due to the corrugated portion. is no problem.

鞍型の樹脂製燃料タンクにおいて、鞍状部には、断面において、車両の上下方向に関し、上方向側の山部と下方向側の谷部が交互に複数連続的に接続される波形状部を有し、鞍状部の波形状部は、鞍状部の深く絞られた領域の頂部の弧状部に形成されるので、パリソンの伸長度合いの局部的な変動が緩和され、樹脂製燃料タンクの略中央部の鞍状部に形成される深く絞られた領域の頂部の弧状部の膜厚が他の部分とほぼ同じまで伸ばされて薄くなり、さらに、波形状になることにより、冷却される金型との接触面積が増加するので、冷却時間を短縮することができる。 In the saddle -shaped resin fuel tank, the saddle-shaped portion has a corrugated portion in which a plurality of upward peaks and downward valleys are alternately and continuously connected with respect to the vertical direction of the vehicle in cross section. and the corrugated portion of the saddle portion is formed in the arcuate portion at the top of the deeply constricted region of the saddle portion. The film thickness of the arc-shaped portion at the top of the deeply drawn region formed in the saddle-shaped portion in the approximate center of the is stretched to be almost the same as that of the other portions and becomes thinner, and furthermore, it becomes wavy, so that it is cooled. Since the contact area with the metal mold increases, the cooling time can be shortened.

波形状部により、樹脂製燃料タンクの略中央部の鞍状部に形成される深く絞られた領域の機械的強度が増大する。また、鞍状部の機械的強度が増大する結果、従前よりも高い温度で成形割金型を開き、次工程における穴あけ加工、内蔵部品の取付等に移行することが可能になり、樹脂製燃料タンクの製造時間を短縮することができる。 The corrugated portion increases the mechanical strength of the deeply constricted region formed in the substantially central saddle portion of the resin fuel tank. In addition, as a result of the increased mechanical strength of the saddle-shaped part, it becomes possible to open the molding split mold at a higher temperature than before, and move on to the next process such as drilling holes and mounting internal parts, and the resin fuel It is possible to shorten the manufacturing time of the tank.

鞍状部の波形状部における膜厚は、パリソンの伸長度合いの局部的な変動が緩和されて波形状部の谷部が波形状部の山部に比べて薄く形成されているので、波形状部内に断続的に薄肉部が形成され、冷却時間をさらに短縮することができる。 The film thickness at the corrugated portion of the saddle portion is such that local fluctuations in the degree of elongation of the parison are alleviated and the trough portions of the corrugated portion are formed thinner than the crest portions of the corrugated portion. A thin portion is intermittently formed in the portion, and the cooling time can be further shortened.

鞍型の樹脂製燃料タンクの外形である。This is the outline of a saddle-shaped resin fuel tank. 鞍型の樹脂製燃料タンクの断面概略図である。1 is a schematic cross-sectional view of a saddle-shaped resin fuel tank; FIG. 本発明の実施形態であり、図２の深く絞られた領域１５近傍を拡大した波形状部の模式断面図である。FIG. 3 is an embodiment of the present invention, and is a schematic cross-sectional view of a corrugated portion in which the vicinity of a deeply drawn region 15 in FIG. 2 is enlarged. 本発明の実施形態であり、波形状が形成された成形割金型と成形後の樹脂部分の図である。It is an embodiment of the present invention, and is a diagram of a molding split mold in which a wave shape is formed and a resin portion after molding. 従来のブロー成形における冷却時間を短縮する方法及び装置の断面説明図である（特許文献２）。It is a cross-sectional explanatory view of a method and apparatus for shortening the cooling time in conventional blow molding (Patent Document 2). 従来の鞍型の樹脂製燃料タンクの断面概略図である（特許文献３）。FIG. 2 is a schematic cross-sectional view of a conventional saddle-shaped resin fuel tank (Patent Document 3).

図１から図４に基づき、本発明の実施形態の鞍型の樹脂製燃料タンク１について説明する。なお、図４は、写真を元にして作成した図である。
鞍型の樹脂製燃料タンク１は図１および図２に示すように、メインタンク部である第１室３と、サブタンク部である第２室４と、これらを中央部１４で接続する鞍状部２とからなる。第１室３、第２室４、および鞍状部２の外壁は、上部壁部１１と下部壁部１２に分割された成形割金型（図示しない）を用い、ブロー成形によって成形され、上部壁部１１と下部壁部１２は、側面において接続部１３で接続されている。 A saddle-shaped resin fuel tank 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. Note that FIG. 4 is a diagram created based on a photograph.
As shown in FIGS. 1 and 2, the saddle-shaped resin fuel tank 1 comprises a first chamber 3 as a main tank portion, a second chamber 4 as a sub-tank portion, and a central portion 14 connecting these chambers in a saddle shape. Part 2. The outer walls of the first chamber 3, the second chamber 4, and the saddle portion 2 are formed by blow molding using a split mold (not shown) divided into an upper wall portion 11 and a lower wall portion 12. The wall portion 11 and the lower wall portion 12 are connected by a connecting portion 13 on the side surface.

鞍状部２の下部壁部１２は、樹脂製燃料タンク１の内側に上方に円弧状に突出しており、鞍状部２の下方には、プロペラシャフト４２やエンジン４１からの排気管（図示せす）を配置するための空間を形成している。鞍状部２の上部壁部１１には満タン検知バルブ４４が配置されている。また、鞍状部２の下部壁部１２には、上方に円弧状に突出し、深く絞られた領域１５があり、深く絞られた領域１５の頂部の弧状部１６には、図３（鞍状部２における深く絞られた領域１５と波形状部２０の位置関係を示す模式断面図）に示すように、波形状部２０が形成されている。なお、本実施形態では、波形状部２０は、車両の車幅方向に形成した。波形状部２０については、後に詳述する。 A lower wall portion 12 of the saddle portion 2 protrudes upward in an arc shape inside the resin fuel tank 1. Below the saddle portion 2, a propeller shaft 42 and an exhaust pipe (not shown) from the engine 41 are provided. It forms a space for arranging A full tank detection valve 44 is arranged on the upper wall portion 11 of the saddle portion 2 . The lower wall portion 12 of the saddle portion 2 has a deeply constricted region 15 that protrudes upward in an arc shape. A schematic sectional view showing the positional relationship between the deeply drawn region 15 and the corrugated portion 20 in the portion 2), the corrugated portion 20 is formed. In addition, in this embodiment, the corrugated portion 20 is formed in the width direction of the vehicle. The corrugated portion 20 will be described later in detail.

メインタンク部である第１室３には、燃料４３をエンジン４１に移送するための燃料ポンプ４５が配置されている。また、エンジン４１と第１室３の間の配管にはジェットポンプ４６が配置され、ジェットポンプ４６からの配管は、さらに、第２室４に延びている。 A fuel pump 45 for transferring fuel 43 to the engine 41 is arranged in the first chamber 3 which is the main tank portion. A jet pump 46 is arranged in the pipe between the engine 41 and the first chamber 3 , and the pipe from the jet pump 46 further extends to the second chamber 4 .

エンジン４１の始動に伴い燃料ポンプ４５が稼働すると、第１室３内の燃料４３がエンジン４１に移送される。これと同時に、燃料ポンプ４５によってエンジン４１に移送される燃料の流速を利用してジェットポンプ４６が稼働し、ベンチュリー効果によって、第２室４からも燃料４３が吸い上げられて、燃料４３がエンジン４１に移送される。 When the fuel pump 45 is activated as the engine 41 is started, the fuel 43 in the first chamber 3 is transferred to the engine 41 . At the same time, the jet pump 46 is operated by utilizing the flow rate of the fuel transferred to the engine 41 by the fuel pump 45, and the fuel 43 is also sucked up from the second chamber 4 by the venturi effect, and the fuel 43 is transferred to the engine 41. transferred to

鞍型の樹脂製燃料タンク１は、高密度ポリエチレン（ＨＤＰＥ）を主材とし、燃料の透過性の極めて少ないバリヤ層には、例えば、エチレン－ビニルアルコール共重合体（ＥｖＯＨ）を用い、樹脂製燃料タンク１の内側から、主材／接着材層／バリヤ層／接着材層／再生材層／主材構造の４種６層構造で構成されている。なお、主材／接着材層／バリヤ層／接着材層／主材の３種５層であってもよい。 The saddle-shaped resin fuel tank 1 is mainly made of high-density polyethylene (HDPE), and the barrier layer with extremely low fuel permeability is made of, for example, ethylene-vinyl alcohol copolymer (EvOH). From the inside of the fuel tank 1, it has a 4-kind, 6-layer structure of main material/adhesive layer/barrier layer/adhesive layer/recycled material layer/main material structure. In addition, 5 layers of 3 kinds of main material/adhesive layer/barrier layer/adhesive layer/main material may be used.

鞍型の樹脂製燃料タンク１は、特許文献１と同様に、開閉面に樹脂成型品を形成するキャビティ３１が形成され、パーティングラインで分割された成形割金型３０を用い、上記金型をパーティングラインで開き、上記構造のパリソンをダイコアから中空状に押出して、キャビティ３１上に配置した後に、上記パリソンの間に内蔵部品を取付けた内蔵部品保持装置を挿入し、内蔵部品をパリソンの内面に取付け、内蔵部品保持装置を抜去の後に成形割金型３０を閉じてブロー成形を行うことによって製造される。なお、内蔵部品については、成形後に、鞍型の樹脂製燃料タンク１の上部壁部１１に穴を開け、その穴から挿入することにより組み付けてもよい。 The saddle-shaped resin fuel tank 1 is formed with a cavity 31 for forming a resin molded product on the opening and closing surfaces in the same manner as in Patent Document 1, and using a split mold 30 divided by a parting line. is opened at the parting line, the parison having the above structure is extruded from the die core in a hollow shape, and after arranging it on the cavity 31, a built-in part holding device with built-in parts attached is inserted between the parisons, and the built-in parts are attached to the parison , and after removing the built-in part holding device, the split mold 30 is closed and blow molding is performed. The built-in part may be assembled by opening a hole in the upper wall portion 11 of the saddle-shaped resin fuel tank 1 after molding and inserting the built-in part through the hole.

図４に示すように、鞍型の樹脂製燃料タンク１の下部壁部１２の波形状部２０を形成するための成形割金型３０のキャビティ３１には、周期が２５ｍｍ、幅（振幅）が５ｍｍの正弦波形状が形成されている。 As shown in FIG. 4, the cavity 31 of the molding split die 30 for forming the corrugated portion 20 of the lower wall portion 12 of the saddle-shaped resin fuel tank 1 has a period of 25 mm and a width (amplitude) of A 5 mm sinusoidal shape is formed.

上記の成形割金型３０を用いて、従前と同じ条件でブロー成形を行った結果、図４に示すように、波形状部２０には、膜厚の厚い部分（約８ｍｍ）と膜厚の薄い部分（約５ｍｍ）ができていることが分かる。また、波形状部２０における膜厚の厚い部分の厚さは、図４の右側の直線部分の膜厚と同じであることが分かる。 Blow molding was performed using the above split mold 30 under the same conditions as before. As a result, as shown in FIG. It can be seen that a thin portion (about 5 mm) is formed. Also, it can be seen that the thickness of the thick portion of the corrugated portion 20 is the same as the thickness of the straight portion on the right side of FIG.

図４において、膜厚の厚い部分は波形状部２０の山部２１に、膜厚の薄い部分は波形状部２０の谷部２２に該当する。これは、上記の通り、波形状部における谷部と山部とは、波形状部における２つの頂部のうち、鞍型の樹脂製燃料タンクを車両に搭載したときに、車体の上下方向に関し、車体の下方向側の頂部を谷部、車体の上方向側の頂部を山部というからである。 In FIG. 4 , the thick portion corresponds to the ridges 21 of the corrugated portion 20 , and the thin portion corresponds to the troughs 22 of the corrugated portion 20 . This is because, as described above, the troughs and peaks of the corrugated portion are, of the two peaks of the corrugated portion, relative to the vertical direction of the vehicle body when the saddle-shaped resin fuel tank is mounted on the vehicle. This is because the peak portion on the downward side of the vehicle body is called the valley portion, and the peak portion on the upward side of the vehicle body is called the peak portion.

なお、成形割金型３０のキャビティ３１において、正弦波形状を用いる場合、周期については、１０ｍｍから５０ｍｍが望ましく、幅（振幅）は、５ｍｍから２０ｍｍが望ましい。周期が１０ｍｍ未満の場合、若しくは５０ｍｍを超える場合は、パリソンの伸長度合いの局部的な変動が十分緩和されず、本発明の効果が得難く、鞍状部２内側に上方に円弧状に突出した頂部の山部２１の膜厚は、従前と同様に厚く形成される。 When a sine wave shape is used in the cavity 31 of the split mold 30, the period is preferably 10 mm to 50 mm, and the width (amplitude) is preferably 5 mm to 20 mm. If the period is less than 10 mm or more than 50 mm, the local variations in the degree of elongation of the parison are not sufficiently alleviated, and the effect of the present invention is difficult to obtain. The film thickness of the crest portion 21 at the top is formed thick as before.

また、幅（振幅）が、５ｍｍ未満の場合は、本発明の効果が得難く、２０ｍｍを超える場合は、樹脂製燃料タンク１を構成するパリソンの伸長度合いの局部的な変動が大きくなり、波形状部２０の山部２１の膜厚が薄くなり、所定の膜厚が得られなくなる。なお、これらの周期や振れ幅については、三角波の場合や、上に凸の円弧と下に凸の円弧が連続的に接続される場合もほぼ同様な傾向を示す。 When the width (amplitude) is less than 5 mm, it is difficult to obtain the effect of the present invention. The film thickness of the ridges 21 of the shape portion 20 becomes thin, and a predetermined film thickness cannot be obtained. It should be noted that these periods and amplitudes exhibit substantially the same tendency in the case of a triangular wave or in the case where an upwardly convex circular arc and a downwardly convex circular arc are continuously connected.

この結果、樹脂製燃料タンクの中央部の鞍状部に形成される深く絞られた領域におけるパリソンの伸長度合いの局部的な変動が緩和され、深く絞られた領域の膜厚が伸ばされて、他の部分とほぼ同じ、若しくはさらに薄い部分が断続的に形成されることにより、波形状部がない場合に比較して、冷却時間を約２割短縮することができた。 As a result, local fluctuations in the degree of elongation of the parison in the deeply drawn region formed in the central saddle-shaped portion of the resin fuel tank are alleviated, and the film thickness of the deeply drawn region is stretched. By intermittently forming portions that are substantially the same as or thinner than other portions, the cooling time can be shortened by about 20% compared to the case where there is no corrugated portion.

また、波形状部により、樹脂製燃料タンクの中央部の鞍状部に形成される深く絞られた領域の機械的強度が増大するので、車両の車幅方向においては、鞍状部を中心に、鞍状部の左右に形成された第１室および第２室が車両の下方向に撓むことを抑制することができた。なお、車両の前後方向に波形状部を形成してもよく、この場合は、車両のねじれに起因する樹脂製燃料タンクのねじれに対する強度も増大する。 In addition, the corrugated portion increases the mechanical strength of the deeply constricted region formed in the central saddle portion of the resin fuel tank. , the first and second chambers formed on the left and right sides of the saddle-shaped portion can be prevented from flexing in the downward direction of the vehicle. Note that the corrugated portion may be formed in the longitudinal direction of the vehicle. In this case, the strength against twisting of the resin fuel tank due to the twisting of the vehicle is also increased.

加えて、波形状部により、樹脂製燃料タンクの中央部の鞍状部に形成される深く絞られた領域の機械的強度が増大するので、従前よりも高い温度で成形割金型を開き、次工程における穴あけ加工、内蔵部品の取付に移行することが可能になり、樹脂製燃料タンクの製造時間をさらに短縮することができた。 In addition, the corrugated portion increases the mechanical strength of the deeply drawn region formed in the central saddle portion of the resin fuel tank, so that the split mold can be opened at a higher temperature than before, It became possible to move on to the next process of drilling holes and attaching built-in parts, further shortening the manufacturing time of the plastic fuel tank.

本発明の実施にあたっては、上記実施形態に限定されるものではなく、本発明の目的を逸脱しない限りにおいて、種々の変更が可能である。 The implementation of the present invention is not limited to the above embodiments, and various modifications are possible without departing from the object of the present invention.

上記の本発明の実施形態では、鞍状部２の下部壁部１２は、樹脂製燃料タンク１の内側に上方に円弧状に突出して形成されているが、プロペラシャフト４２やエンジン４１からの排気管（図示せす）の配置によっては、鞍状部２の下部壁部１２の樹脂製燃料タンク１の内側に上方に突出する形状が、円弧状でなく、他の弧状の場合や、弧状に一部直線部分が加わった形状になる場合がある。この場合も、波形状部２０がない状態で成形したときに、鞍状部２の下部壁部１２の樹脂製燃料タンク１の内側に上方に突出した部分（深く絞られた領域１５）の膜厚が他の部分に比較して厚くなる場合には、本発明が適用できる。 In the above-described embodiment of the present invention, the lower wall portion 12 of the saddle portion 2 is formed to protrude upward in an arc shape inside the resin fuel tank 1. Depending on the arrangement of the pipe (not shown), the shape of the lower wall portion 12 of the saddle portion 2 projecting upward toward the inside of the resin fuel tank 1 may not be arcuate, but may be arcuate. It may become a shape with some straight parts added. In this case also, when molding is performed without the corrugated portion 20, the film of the portion (the deeply drawn region 15) of the lower wall portion 12 of the saddle portion 2 protruding upward toward the inside of the resin fuel tank 1 The present invention can be applied when the thickness is thicker than other portions.

上記の本発明の実施形態では、鞍型の樹脂製燃料タンク１に関し、鞍状部２が、第１室３の上部壁部１１、および第２室４の上部壁部１１と同一面を形成しているタイプの下部壁部１２に形成された鞍状部２内側に、深く絞られた領域１５の頂部の弧状部１６に波形状部２０にしたが、図６に示すような、第１室３００の上部壁部１１０、および第２室４００の上部壁部１１０と比べて、鉛直方向に盛り上がっているタイプや第１室３００の上部壁部１１０、および第２室４００の上部壁部１１０と比べて、鉛直方向に凹んでいるタイプの上部壁部１１０に形成された鞍状部２００にも適用することができる。 In the embodiment of the present invention described above, regarding the saddle-shaped resin fuel tank 1, the saddle-shaped portion 2 forms the same surface as the upper wall portion 11 of the first chamber 3 and the upper wall portion 11 of the second chamber 4. Inside the saddle 2 formed in the bottom wall 12 of the saddle type, the arcuate portion 16 at the top of the deep constricted region 15 was made into a corrugated portion 20, as shown in FIG. Compared to the upper wall portion 110 of the chamber 300 and the upper wall portion 110 of the second chamber 400, the type that is raised in the vertical direction or the upper wall portion 110 of the first chamber 300 and the upper wall portion 110 of the second chamber 400 In comparison, it can also be applied to a saddle-shaped part 200 formed on a vertically recessed type of upper wall part 110 .

１、１００ 鞍型の樹脂製燃料タンク
２、２００ 鞍状部
３、３００ 第１室
４、４００ 第２室
１１、１１０ 上部壁部
１２、１２０ 下部壁部
１３ 接続部
１４、１４０ 中央部
１５、１５０ 深く絞られた領域
１６、１６０ 弧状部
２０ 波形状部
２１ 山部
２２ 谷部
３０ 成形割金型
３１ キャビティ
４１ エンジン
４２ プロペラシャフト
４３ 燃料
４４ 満タン検知バルブ
４５ 燃料ポンプ
４６ ジェットポンプ 1, 100 saddle-shaped resin fuel tank 2, 200 saddle-shaped portion 3, 300 first chamber 4, 400 second chamber 11, 110 upper wall portions 12, 120 lower wall portion 13 connecting portions 14, 140 central portion 15, 150 deep drawn regions 16, 160 arc-shaped portion 20 corrugated portion 21 peak portion 22 valley portion 30 molding split mold 31 cavity 41 engine 42 propeller shaft 43 fuel 44 full tank detection valve 45 fuel pump 46 jet pump

Claims (2)

車両に搭載された内燃機関に供給する燃料を、第１室および第２室の間に鞍状部を有する室内に貯留する鞍型の樹脂製燃料タンクであって、前記鞍状部には、断面において、前記車両の上下方向に関し、上方向側の山部と下方向側の谷部が交互に複数連続的に接続される波形状部を有し、前記鞍状部の前記波形状部は、前記鞍状部の深く絞られた領域の頂部の弧状部に形成されることを特徴とする鞍型の樹脂製燃料タンク。 A saddle-shaped resin fuel tank for storing fuel to be supplied to an internal combustion engine mounted on a vehicle in a chamber having a saddle-shaped portion between a first chamber and a second chamber, wherein the saddle-shaped portion includes: In the cross section, with respect to the vertical direction of the vehicle, a plurality of wavy portions are formed by alternately connecting peaks on the upward side and troughs on the downward side, and the wavy portion of the saddle portion includes : 1. A saddle-shaped resin fuel tank, characterized in that it is formed in an arc-shaped portion at the top of the deeply constricted region of the saddle-shaped portion . 前記鞍状部の前記波形状部における膜厚は、前記波形状部の前記谷部が前記波形状部の前記山部に比べて薄く形成されている請求項１に記載の鞍型の樹脂製燃料タンク。 2. The saddle-shaped resin-made saddle according to claim 1 , wherein the film thickness of the corrugated portion of the saddle portion is such that the valley portion of the corrugated portion is thinner than the crest portion of the corrugated portion. fuel tank.
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