JP2014051215A - Fuel tank - Google Patents

Fuel tank Download PDF

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JP2014051215A
JP2014051215A JP2012197565A JP2012197565A JP2014051215A JP 2014051215 A JP2014051215 A JP 2014051215A JP 2012197565 A JP2012197565 A JP 2012197565A JP 2012197565 A JP2012197565 A JP 2012197565A JP 2014051215 A JP2014051215 A JP 2014051215A
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tank
fuel tank
tank portion
fuel
upper tank
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Ryuta Aoe
竜太 青江
Toshimasa Asahara
利昌 朝原
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FTS Co Ltd
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FTS Co Ltd
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Priority to JP2012197565A priority Critical patent/JP2014051215A/en
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    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B29C66/1312—Single flange to flange joints, the parts to be joined being rigid
    • 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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • 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
    • B29C66/70—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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a fuel tank having an upper tank and a lower tank formed independently, which is configured to decrease weight while sufficiently maintaining rigidity.SOLUTION: A fuel tank 1 is made of thermoplastic synthetic resin. The fuel tank 1 is formed by joining together an opening peripheral edge 11 of an upper tank part 10 and an opening peripheral edge 21 of a lower tank part 20, which are divided and independently subjected to injection molding. The upper tank part 10 and the lower tank part 20 are respectively formed of thermoplastic resin foamed at an expansion ration of 1.1 to 2.0.

Description

本発明は、別々に分割して形成されたアッパータンク部とロアタンク部を合体させて形成された、熱可塑性合成樹脂製の燃料タンクに関するものである。   The present invention relates to a fuel tank made of thermoplastic synthetic resin, which is formed by combining an upper tank portion and a lower tank portion that are separately formed.

従来、燃料タンク、特に自動車用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。
合成樹脂製の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、溶融した合成樹脂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, metal tanks have been used as fuel tanks, especially automobile fuel tanks. However, in recent years, the weight of vehicles has been reduced, rust does not occur, and it is easy to mold into desired shapes. Those made of thermoplastic synthetic resin have come to be used.
In the production of a synthetic resin fuel tank, a blow molding method has been often used because of the ease of molding a hollow body. In the blow molding method, a melted synthetic resin parison 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.

しかし、この方法では、例えば、自動車用燃料タンクのような大型の合成樹脂製中空製品の場合は、パリソンの全体の重量が大きくなり、また、自動車用燃料タンクの強度が必要な場合に、強度増加のため厚肉の自動車用燃料タンクを製造するときにもパリソンの重量が増加して、溶融状のパリソンを成形機の上部から金型に入れるときに下方に垂れるため、上部の肉厚が下部の肉厚よりも薄くなる場合があった。
また、自動車用燃料タンクのような複雑な形状をした製品の場合は、パリソンを金型内で膨張させたときに、パリソンの膨張の割合が製品の部位によって異なる場合があり、製品の肉厚にバラツキが生じる場合があった。 However, with this method, for example, in the case of a large synthetic resin hollow product such as an automobile fuel tank, the overall weight of the parison increases, and when the strength of the automobile fuel tank is required, Because of the increase, the weight of the parison also increases when manufacturing a thick-walled automobile fuel tank, and when the molten parison is dropped from the upper part of the molding machine into the mold, the upper wall thickness is reduced. In some cases, it was thinner than the wall thickness at the bottom.
In addition, in the case of a product with a complicated shape such as a fuel tank for automobiles, when the parison is expanded in the mold, the rate of expansion of the parison may vary depending on the part of the product. In some cases, there was variation.

ブロー成形製の燃料タンクは、リブや梁等を設けることも難しく、また、パリソンの膨張の割合が製品の部位によって異なる場合があり、タンクの肉厚にバラツキが生じる。従って、肉厚管理、品質管理に多大な労力を要していた。さらに、燃料タンク内にバルブ等の付属品を取付けることも困難であった。
そのため合成樹脂製中空体を上下に分割して、それぞれ別に射出成形等により成形して、その後そのアッパータンクとロアタンクを突き合せ部にて接合して燃料タンクを形成していた。 In a blow molded fuel tank, it is difficult to provide ribs, beams and the like, and the rate of expansion of the parison may vary depending on the part of the product, resulting in variations in the tank thickness. Therefore, a great deal of labor has been required for wall thickness management and quality control. Furthermore, it is difficult to attach accessories such as valves in the fuel tank.
Therefore, the synthetic resin hollow body is divided into upper and lower parts and molded separately by injection molding or the like, and then the upper tank and the lower tank are joined at the butting portion to form a fuel tank.

このような、アッパータンクとロアタンクを成形する方法においては、例えば、図７に示すように、燃料タンク１０１のアッパータンク１０２とロアタンク１０３の内面１１０に燃料透過防止性能の高い材料を使用し、外面１２０に剛性の高い材料を使用して、２層からなる上下分割体をそれぞれ射出形成し、その後その上下分割体を溶着接合するものがある（例えば、特許文献１参照。）。   In such a method of forming the upper tank and the lower tank, for example, as shown in FIG. 7, a material having high fuel permeation prevention performance is used for the upper tank 102 of the fuel tank 101 and the inner surface 110 of the lower tank 103, and the outer surface There is a type in which a material having high rigidity is used for 120, and an upper and lower divided body made of two layers is formed by injection, and then the upper and lower divided bodies are welded and joined (for example, see Patent Document 1).

しかしながら、この２層を成形する場合は、まず外面１２０を射出成形した後に、さらに再度内面１１０を射出成形して形成するため、成形作業の手間がかかるとともに、内面を成形するために高度な制御が必要であった。
また、外面１２０の剛性の高い層を形成するために、少なくとも３ｍｍ程度の肉厚を持たせる必要があり、このため燃料タンク１０１の全体の重量が増加して、車両の軽量化の要請に反することとなっている。 However, when molding these two layers, the outer surface 120 is first injection-molded, and then the inner surface 110 is again injection-molded, which requires a lot of molding work and is highly controlled for molding the inner surface. Was necessary.
In addition, in order to form a highly rigid layer of the outer surface 120, it is necessary to have a thickness of at least about 3 mm, which increases the overall weight of the fuel tank 101 and is contrary to the demand for weight reduction of the vehicle. It is supposed to be.

特開２００４−９８８８６号公報JP 2004-98886 A

このようにアッパータンクとロアタンクを別々に形成した燃料タンクにおいて、剛性を充分維持しつつ、重量を低減した燃料タンクが求められていた。   Thus, there has been a demand for a fuel tank in which the upper tank and the lower tank are separately formed and the weight is reduced while maintaining sufficient rigidity.

上記課題を解決するための請求項１の本発明は、熱可塑性合成樹脂製の燃料タンクにおいて、
燃料タンクは、分割して別々に射出成形されたアッパータンク部とロアタンク部のそれぞれの開口周縁部が合体されて形成され、
アッパータンク部とロアタンク部は、それぞれ発泡倍率１．１〜２．０で発泡された熱可塑性樹脂で形成されたことを特徴とする燃料タンクである。 The present invention of claim 1 for solving the above-mentioned problems is a fuel tank made of thermoplastic synthetic resin,
The fuel tank is formed by combining the opening peripheral portions of the upper tank portion and the lower tank portion, which are separately divided and injection molded,
Each of the upper tank portion and the lower tank portion is a fuel tank formed of a thermoplastic resin foamed at a foaming ratio of 1.1 to 2.0.

請求項１の本発明では、燃料タンクは、分割して別々に成形されたアッパータンク部とロアタンク部のそれぞれの開口周縁部が合体されて形成されている。このため、アッパータンク部とロアタンク部とを別々に射出成形で成形して、寸法精度の高い、強度の強いアッパータンク部とロアタンク部を得ることができる。従って、アッパータンク部とロアタンク部とを組み合わせて形成された合成樹脂製燃料タンクは、寸法精度の高い精密な、かつ強度の高い製品を得ることができる。また、アッパータンク部とロアタンク部の内部に補強リブや内蔵部品等を取付けることが容易にできる。   In the first aspect of the present invention, the fuel tank is formed by combining the opening peripheral portions of the upper tank portion and the lower tank portion which are separately divided and formed. For this reason, an upper tank part and a lower tank part can be separately molded by injection molding to obtain an upper tank part and a lower tank part with high dimensional accuracy and high strength. Therefore, a synthetic resin fuel tank formed by combining the upper tank portion and the lower tank portion can provide a precise and high strength product with high dimensional accuracy. Further, it is possible to easily attach a reinforcing rib, a built-in component, or the like inside the upper tank portion and the lower tank portion.

アッパータンク部とロアタンク部は、それぞれ発泡倍率１．１〜２．０で発泡された熱可塑性樹脂で形成された。このため、アッパータンク部とロアタンク部の外壁の剛性を維持しつつ、その重量を低減することができる。アッパータンク部とロアタンク部の外壁の肉厚を維持することにより、外壁の断面２次モーメントは変化しないため、燃料タンクの撓み量も維持することができる。   The upper tank part and the lower tank part were each formed of a thermoplastic resin foamed at a foaming ratio of 1.1 to 2.0. For this reason, the weight can be reduced, maintaining the rigidity of the outer wall of an upper tank part and a lower tank part. By maintaining the thickness of the outer walls of the upper tank portion and the lower tank portion, the second moment of section of the outer wall does not change, so that the deflection amount of the fuel tank can also be maintained.

また、アッパータンク部とロアタンク部の外壁が発泡体のため、燃料タンクとしての断熱層を形成し、燃料タンク内の温度上昇を防ぎ、燃料タンク内からの燃料蒸気の発生量を抑制することができる。
さらに、発泡成型のため、射出成形時の射出成形金型の保圧力を低くすることができるため、射出成形機を小型化することができ、コストを低減できる。 In addition, because the outer walls of the upper tank and lower tank are foamed, it forms a heat insulation layer as a fuel tank, preventing temperature rise in the fuel tank and reducing the amount of fuel vapor generated from the fuel tank. it can.
Furthermore, because of the foam molding, the holding pressure of the injection mold during the injection molding can be lowered, so that the injection molding machine can be reduced in size and the cost can be reduced.

請求項２の本発明は、アッパータンク部とロアタンク部の外壁の肉厚は、３．０〜５．０ｍｍである燃料タンクである。   The present invention of claim 2 is a fuel tank in which the outer wall thickness of the upper tank portion and the lower tank portion is 3.0 to 5.0 mm.

請求項２の本発明では、アッパータンク部とロアタンク部の外壁の肉厚は、３．０〜５．０ｍｍであるため、アッパータンク部とロアタンク部の外壁の肉厚を増加させることなく、燃料タンクとしての２次モーメントを維持して、その外壁の剛性を維持することができる。
３．０ｍｍ未満では、アッパータンク部とロアタンク部の外壁の剛性が低下して、５．０ｍｍを超える場合には、燃料タンクに重量が増加して、コストが増加するとともに、車両の軽量化の要請に反することとなる。 In the present invention of claim 2, since the wall thickness of the outer wall of the upper tank part and the lower tank part is 3.0 to 5.0 mm, the fuel can be produced without increasing the wall thickness of the outer wall of the upper tank part and the lower tank part. The second moment as a tank can be maintained, and the rigidity of the outer wall can be maintained.
If it is less than 3.0 mm, the rigidity of the outer walls of the upper tank portion and the lower tank portion is reduced, and if it exceeds 5.0 mm, the weight of the fuel tank is increased, the cost is increased, and the weight of the vehicle is reduced. It will be against the request.

請求項３の本発明は、アッパータンク部とロアタンク部は、高密度ポリエチレン（ＨＤＰＥ）、ポリエチレンサルファイド（ＰＰＳ）ゴムアロイ、ポリアセタール、ナイロン、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリフェニレンサルファイドのうち少なくとも１種類の材料から形成される燃料タンクである。   According to the present invention of claim 3, the upper tank portion and the lower tank portion are made of at least one material selected from high density polyethylene (HDPE), polyethylene sulfide (PPS) rubber alloy, polyacetal, nylon, polybutylene terephthalate, polyethylene terephthalate, and polyphenylene sulfide. A fuel tank formed from

請求項３の本発明では、アッパータンク部とロアタンク部は、高密度ポリエチレン（ＨＤＰＥ）、ポリエチレンサルファイド（ＰＰＳ）ゴムアロイ、ポリアセタール、ナイロン、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリフェニレンサルファイドのうち少なくとも１種類の材料から形成される。このため、剛性と耐燃料油性を有しており、強度が大きく、タンク壁を厚くしなくても燃料タンクの強度を保つことができ、燃料タンクの重量を低減することができるとともに、燃料透過防止性に優れており、燃料タンクからの燃料の透過を防止できる。
さらに、高密度ポリエチレン（ＨＤＰＥ）を使用する場合には、オレフィン系熱可塑性合成樹脂でありリサイクル利用が容易である。 In the present invention of claim 3, the upper tank portion and the lower tank portion are made of at least one material selected from high density polyethylene (HDPE), polyethylene sulfide (PPS) rubber alloy, polyacetal, nylon, polybutylene terephthalate, polyethylene terephthalate, and polyphenylene sulfide. Formed from. For this reason, it has rigidity and fuel oil resistance, has high strength, can maintain the strength of the fuel tank without increasing the thickness of the tank wall, can reduce the weight of the fuel tank, and can permeate the fuel. It is excellent in prevention and can prevent the permeation of fuel from the fuel tank.
Furthermore, when high density polyethylene (HDPE) is used, it is an olefinic thermoplastic synthetic resin and can be easily recycled.

請求項４の本発明は、アッパータンク部とロアタンク部のそれぞれの開口周縁部は、全周に亘りそれぞれ略直角に外側に張り出したフランジ部が形成され、フランジ部は相互に固着された燃料タンクである。   According to a fourth aspect of the present invention, each of the opening peripheral portions of the upper tank portion and the lower tank portion is formed with a flange portion projecting outward substantially perpendicularly over the entire circumference, and the flange portions are fixed to each other. It is.

請求項４の本発明では、アッパータンク部とロアタンク部のそれぞれの開口周縁部は、全周に亘りそれぞれ略直角に外側に張り出したフランジ部が形成され、フランジ部は相互に固着された。このため、このアッパータンク部とロアタンク部のフランジ部を相互に圧着することにより、アッパータンク部とロアタンク部の開口周縁を全周にわたり強固に密着して、固着することができる。   In the fourth aspect of the present invention, the opening peripheral portions of the upper tank portion and the lower tank portion are formed with flange portions projecting outward at substantially right angles over the entire circumference, and the flange portions are fixed to each other. For this reason, the flange part of this upper tank part and a lower tank part is mutually crimped | bonded, and the opening peripheral edge of an upper tank part and a lower tank part can be firmly stuck and fixed to the whole periphery.

請求項５の本発明は、アッパータンク部とロアタンク部は、それぞれ内面からタンクの内方向に向かって複数の内側リブが一体的に形成された燃料タンクである。   The present invention of claim 5 is a fuel tank in which the upper tank portion and the lower tank portion are each integrally formed with a plurality of inner ribs from the inner surface toward the inner side of the tank.

請求項５の本発明では、アッパータンク部とロアタンク部は、それぞれ内面からタンクの内方向に向かって複数の内側リブが一体的に形成されたため、燃料タンクの内部に、仕切り板や、燃料ポンプ等の部品を装着することが容易になるとともに、燃料タンクの強度を増加させることができる。   In the present invention of claim 5, since the upper tank portion and the lower tank portion each have a plurality of inner ribs integrally formed from the inner surface toward the inner side of the tank, the partition plate and the fuel pump are provided inside the fuel tank. It becomes easy to mount such parts, and the strength of the fuel tank can be increased.

請求項６の本発明は、アッパータンク部とロアタンク部は、それぞれ外面からタンクの外方向に向かって複数の外側リブが一体的に形成された燃料タンクである。   The present invention of claim 6 is the fuel tank in which the upper tank portion and the lower tank portion are each integrally formed with a plurality of outer ribs from the outer surface toward the outer side of the tank.

請求項６の本発明では、アッパータンク部とロアタンク部は、それぞれ外面からタンクの外方向に向かって複数の外側リブが一体的に形成されたため、燃料タンクの強度を増加させることができるとともに、ホースクランプ等の部品を取付けることができる。   In the present invention of claim 6, since the plurality of outer ribs are integrally formed from the outer surface toward the outer side of the tank, the upper tank portion and the lower tank portion can increase the strength of the fuel tank, Parts such as hose clamps can be attached.

請求項７の本発明は、燃料タンクは、自動車用燃料タンクである。   According to a seventh aspect of the present invention, the fuel tank is an automobile fuel tank.

請求項７の本発明は、燃料タンクは、自動車用燃料タンクであるため、自動車に搭載されても、発泡体であるので全体の重量が少なく、車両の軽量化に貢献することができるとともに、断熱性に優れて、燃料タンク内の燃料の蒸発を防止できる。   According to the seventh aspect of the present invention, since the fuel tank is a fuel tank for automobiles, even if it is mounted on an automobile, it is a foam so that the overall weight is small, which can contribute to weight reduction of the vehicle. It has excellent heat insulation and can prevent evaporation of fuel in the fuel tank.

アッパータンク部とロアタンク部は、それぞれ発泡倍率１．１〜２．０で発泡された熱可塑性樹脂で形成されたため、アッパータンク部とロアタンク部の外壁の剛性を維持しつつ、その重量を低減することができる。
また、アッパータンク部とロアタンク部の外壁が発泡体のため、断熱層を形成し、燃料タンク内の温度上昇を防ぎ、燃料蒸気の発生量を抑制することができ、発泡成型のため、射出成形時の射出成形金型の保圧力を低くすることができるため、射出成形機を小型化することができ、コストを低減できる。 Since the upper tank part and the lower tank part are each formed of a thermoplastic resin foamed at a foaming ratio of 1.1 to 2.0, the weight of the upper tank part and the lower tank part is reduced while maintaining the rigidity of the outer walls of the upper tank part and the lower tank part. be able to.
In addition, the outer walls of the upper tank and lower tank are made of foam, so a heat insulation layer can be formed, temperature rise in the fuel tank can be prevented, and the amount of fuel vapor generated can be suppressed. Since the holding pressure of the injection mold at the time can be lowered, the injection molding machine can be reduced in size and the cost can be reduced.

本発明の実施の形態である燃料タンクを斜め上方から見た斜視図である。It is the perspective view which looked at the fuel tank which is embodiment of this invention from diagonally upward. 本発明の実施の形態である燃料タンクの長手方向の断面図であり、図１のＸ−Ｘ線に沿った断面図である。It is sectional drawing of the longitudinal direction of the fuel tank which is embodiment of this invention, and is sectional drawing along the XX line of FIG. 本発明の実施の形態である燃料タンクの幅方向の断面図であり、図１のＹ−Ｙ線に沿った断面図である。It is sectional drawing of the width direction of the fuel tank which is embodiment of this invention, and is sectional drawing along the YY line of FIG. 本発明の実施の形態である燃料タンクの外壁の一部拡大断面図である。It is a partial expanded sectional view of the outer wall of the fuel tank which is embodiment of this invention. 本発明の実施の形態であるアッパータンク部を成形する金型の断面図であり、アッパータンク部の外壁を構成する合成樹脂を少しキャビティに射出した状態を示す。It is sectional drawing of the metal mold | die which shape | molds the upper tank part which is embodiment of this invention, and shows the state which injected the synthetic resin which comprises the outer wall of an upper tank part into a cavity a little. 本発明の実施の形態である燃料タンクのアッパータンク部とロアタンク部の開口周縁部を熱板で溶融する状態の断面模式図である。It is a cross-sectional schematic diagram of the state which fuse | melts the upper peripheral part of the fuel tank which is embodiment of this invention, and the opening peripheral part of a lower tank part with a hot platen. 従来の燃料タンクの断面図である。It is sectional drawing of the conventional fuel tank.

本発明の実施の形態である燃料タンク１について、自動車用燃料タンクを例にとり、図１〜図６に基づき説明する。
図１〜図４に基づき、燃料タンク１の形状、構成を説明し、図５〜図６に基づき、燃料タンク１の製造方法を説明する。 A fuel tank 1 according to an embodiment of the present invention will be described with reference to FIGS.
The shape and configuration of the fuel tank 1 will be described with reference to FIGS. 1 to 4, and the method for manufacturing the fuel tank 1 will be described with reference to FIGS. 5 to 6.

燃料タンク１は、分割して成形されたアッパータンク部１０とロアタンク部２０から構成される。アッパータンク部１０は、燃料タンク１の外壁１５を形成し、ロアタンク部２０は、燃料タンク１の外壁２５を形成する。
アッパータンク部１０とロアタンク部２０は、それぞれ、１層の発泡層で形成されるが、発泡層の上にシート材等を貼着した表皮層を設けてもよい。燃料タンク１の分割は２個ばかりでなく３個以上に分割することも可能である。 The fuel tank 1 includes an upper tank portion 10 and a lower tank portion 20 that are separately formed. The upper tank portion 10 forms the outer wall 15 of the fuel tank 1, and the lower tank portion 20 forms the outer wall 25 of the fuel tank 1.
Each of the upper tank portion 10 and the lower tank portion 20 is formed of a single foam layer, but a skin layer in which a sheet material or the like is adhered on the foam layer may be provided. The fuel tank 1 can be divided into not only two but also three or more.

アッパータンク部１０には、パイプ取付孔２とポンプユニット取付孔３が形成されている。ポンプユニット取付孔３は、燃料タンク１内部に後述するポンプユニット５を取付け、取り外すための孔であり、パイプ取付孔２は、燃料注入用のパイプ（図示せず）を取付ける孔である。なお、アッパータンク部１０の上面には、燃料移送用ホース等の各種のホースを保持するホースクランプ４や、燃料移送用ホース等と燃料タンク１内部とを連結するクランプ等を設けてもよい。   A pipe mounting hole 2 and a pump unit mounting hole 3 are formed in the upper tank portion 10. The pump unit mounting hole 3 is a hole for mounting and removing a pump unit 5 (described later) inside the fuel tank 1, and the pipe mounting hole 2 is a hole for mounting a fuel injection pipe (not shown). Note that a hose clamp 4 that holds various hoses such as a fuel transfer hose, a clamp that connects the fuel transfer hose and the like and the inside of the fuel tank 1 may be provided on the upper surface of the upper tank portion 10.

アッパータンク部１０とロアタンク部２０の内面には、複数の内側リブ１６、２６がそれぞれ、燃料タンク１の内部方向に向けて一体的に形成することができる。
この場合には、アッパータンク部１０とロアタンク部２０の外壁１５、２５外面には、複数の外側リブ１８，２８が燃料タンク１の外面に外方向に向けて一体的に形成されている。 A plurality of inner ribs 16 and 26 can be integrally formed on the inner surfaces of the upper tank portion 10 and the lower tank portion 20 toward the inner direction of the fuel tank 1.
In this case, a plurality of outer ribs 18 and 28 are integrally formed outwardly on the outer surface of the fuel tank 1 on the outer surfaces 15 and 25 of the upper tank portion 10 and the lower tank portion 20.

この内側リブ１６、２６と外側リブ１８、２８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、付属部品等を装着することが容易である。
ロアタンク部２０には、図２に示すように、ポンプユニット５が取付けられている。ポンプユニット５は、ロアタンク部２０の内面に一体的に形成されたポンプユニット取付台２７に固定されている。 The strength of the fuel tank 1 can be improved by the inner ribs 16 and 26 and the outer ribs 18 and 28, and attachment parts and the like can be easily attached.
As shown in FIG. 2, the pump unit 5 is attached to the lower tank portion 20. The pump unit 5 is fixed to a pump unit mounting base 27 that is integrally formed on the inner surface of the lower tank portion 20.

アッパータンク部１０とロアタンク部２０は、剛性と耐燃料性に優れた熱可塑性合成樹脂を使用して、例えば、高密度ポリエチレン（ＨＤＰＥ）、ポリエチレンスルファイド（ＰＰＳ）、ポリアセタール、ナイロン、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリフェニレンサルファイドのうち少なくとも１種類の材料を使用することができる。   The upper tank portion 10 and the lower tank portion 20 use a thermoplastic synthetic resin having excellent rigidity and fuel resistance, for example, high density polyethylene (HDPE), polyethylene sulfide (PPS), polyacetal, nylon, polybutylene terephthalate. At least one material of polyethylene terephthalate and polyphenylene sulfide can be used.

この場合には、アッパータンク部１０とロアタンク部２０は、強度が大きく、アッパータンク部１０とロアタンク部２０のそれぞれの外壁１５、２５を厚くしなくても燃料タンク１の強度を保つことができる。また、燃料タンク１の外壁１５、２５の強度を増加させるために、その肉厚を厚くする必要がなく、燃料タンク１の重量を低減することができるとともに、燃料透過防止性に優れており、燃料タンク１からの燃料の透過を防止できる。
さらに、高密度ポリエチレン（ＨＤＰＥ）を使用する場合には、オレフィン系熱可塑性合成樹脂でありリサイクル利用が容易である。 In this case, the upper tank portion 10 and the lower tank portion 20 have high strength, and the strength of the fuel tank 1 can be maintained without increasing the thickness of the outer walls 15 and 25 of the upper tank portion 10 and the lower tank portion 20, respectively. . Further, in order to increase the strength of the outer walls 15 and 25 of the fuel tank 1, it is not necessary to increase the thickness thereof, the weight of the fuel tank 1 can be reduced, and the fuel permeation preventing property is excellent. The permeation of fuel from the fuel tank 1 can be prevented.
Furthermore, when high density polyethylene (HDPE) is used, it is an olefinic thermoplastic synthetic resin and can be easily recycled.

図４に示すように、アッパータンク部１０とロアタンク部２０の外壁１５、２５の肉厚（Ｔ）は、それぞれ３．０〜５．０ｍｍであることが好ましい。この場合には、アッパータンク部１０とロアタンク部２０の外壁１５、２５の肉厚（Ｔ）を増加させることなく、その外壁１５、２５の剛性を維持することができる。この外壁１５、２５の肉厚（Ｔ）は、外壁１５、２５の上面、下面、側面とも上記の厚さの範囲で使用することができる。   As shown in FIG. 4, the wall thicknesses (T) of the outer walls 15 and 25 of the upper tank portion 10 and the lower tank portion 20 are preferably 3.0 to 5.0 mm, respectively. In this case, the rigidity of the outer walls 15 and 25 can be maintained without increasing the thickness (T) of the outer walls 15 and 25 of the upper tank portion 10 and the lower tank portion 20. The wall thickness (T) of the outer walls 15 and 25 can be used within the above-mentioned thickness range for the upper surface, the lower surface, and the side surfaces of the outer walls 15 and 25.

肉厚（Ｔ）が、３．０ｍｍ未満では、アッパータンク部１０とロアタンク部２０の外壁１５、２５の剛性が低下して、好ましくない。肉厚（Ｔ）が、５．０ｍｍを超える場合には、アッパータンク部１０とロアタンク部２０の重量が増加して、燃料タンク１に重量が増加して、材料が多くなり、コストが増加するとともに、車両の軽量化の要請に反することとなる。   If the wall thickness (T) is less than 3.0 mm, the rigidity of the outer walls 15 and 25 of the upper tank portion 10 and the lower tank portion 20 is lowered, which is not preferable. When the wall thickness (T) exceeds 5.0 mm, the weights of the upper tank portion 10 and the lower tank portion 20 are increased, the weight is increased in the fuel tank 1, the material is increased, and the cost is increased. At the same time, it is against the request for weight reduction of the vehicle.

アッパータンク部１０とロアタンク部２０は、それぞれ発泡倍率１．１〜２．０で発泡された熱可塑性樹脂で形成されている。そして、アッパータンク部１０とロアタンク部２０の肉厚は、従来の燃料タンク１の肉厚から増加することなく上記のように、３．０〜５．０ｍｍであることが好ましい。   The upper tank portion 10 and the lower tank portion 20 are each formed of a thermoplastic resin foamed at a foaming ratio of 1.1 to 2.0. The thickness of the upper tank portion 10 and the lower tank portion 20 is preferably 3.0 to 5.0 mm as described above without increasing from the thickness of the conventional fuel tank 1.

この場合には、アッパータンク部１０とロアタンク部２０の外壁１５、２５の剛性を維持しつつ、その重量を低減することができる。アッパータンク部１０とロアタンク部２０の外壁１５、２５に肉厚（Ｔ）を維持することにより、外壁１５、２５の断面２次モーメントは変化しないため、燃料タンク１の撓み量も維持することができる。   In this case, the weight can be reduced while maintaining the rigidity of the outer walls 15 and 25 of the upper tank portion 10 and the lower tank portion 20. By maintaining the thickness (T) of the outer walls 15 and 25 of the upper tank portion 10 and the lower tank portion 20, the sectional moment of inertia of the outer walls 15 and 25 does not change, so that the deflection amount of the fuel tank 1 can also be maintained. it can.

また、アッパータンク部１０とロアタンク部２０の外壁１５、２５が発泡体のため、燃料タンク１としての断熱層を形成することができ、燃料タンク１内の温度上昇を防ぎ、燃料タンク１内の燃料蒸気の発生量を抑制することができる。
さらに、後述するように発泡成型のため、射出成形時の射出成形金型の保圧力を低くすることができるため、射出成形機を小型化することができ、コストを低減できる。 Further, since the outer walls 15 and 25 of the upper tank portion 10 and the lower tank portion 20 are foamed, a heat insulating layer as the fuel tank 1 can be formed, and a temperature rise in the fuel tank 1 can be prevented, and the inside of the fuel tank 1 can be prevented. The amount of fuel vapor generated can be suppressed.
Further, as will be described later, because of foam molding, the holding pressure of the injection mold during injection molding can be lowered, so that the injection molding machine can be reduced in size and the cost can be reduced.

アッパータンク部１０とロアタンク部２０を形成する合成樹脂の発泡は、発泡剤として、化学発泡剤又は物理発泡剤を使用することができる。
化学発泡剤を使用する場合は、化学発泡剤としては熱分解形の発泡剤を使用し、例えば炭酸水素ナトリウム、クエン酸ナトリウム、アゾジカルボンアミド等を使用することができる。これ等の熱分解形発泡剤を使用すると、樹脂に発泡剤を混入して、燃料タンク１を成形するときの樹脂の溶融温度で化学発泡剤が分解して容易に発泡することができ、燃料タンク１の成形と発泡を同時にすることができ、発泡率の制御も容易であり、製造が容易である。 For the foaming of the synthetic resin forming the upper tank part 10 and the lower tank part 20, a chemical foaming agent or a physical foaming agent can be used as the foaming agent.
When a chemical foaming agent is used, a thermal decomposition type foaming agent is used as the chemical foaming agent, and for example, sodium hydrogen carbonate, sodium citrate, azodicarbonamide and the like can be used. When these pyrolytic foaming agents are used, the foaming agent is mixed into the resin, and the chemical foaming agent can be decomposed and easily foamed at the melting temperature of the resin when the fuel tank 1 is molded. The tank 1 can be molded and foamed at the same time, the foaming rate can be easily controlled, and the production is easy.

物理発泡剤を使用する場合には、物理発泡剤として、例えば、プロパン、ノルマルブタン、イソブタン、ノルマルペンタン、イソペンタン、ノルマルヘキサン、イソヘキサン、シクロヘキサン等の脂肪族炭化水素、塩化メチル、塩化エチル等の塩化炭化水素、１，１，１，２−テトラフロロエタン、１，１−ジフロロエタン等のフッ化炭化水素、沸点が押し出し温度以下の各種アルコールなどのような液体、又は炭酸ガス、窒素等の無機ガスなどが挙げられる。これらの揮発性発泡剤は、混合して用いることもできる。   When a physical foaming agent is used, examples of the physical foaming agent include aliphatic hydrocarbons such as propane, normal butane, isobutane, normal pentane, isopentane, normal hexane, isohexane, and cyclohexane, and chlorides such as methyl chloride and ethyl chloride. Hydrocarbons, fluorinated hydrocarbons such as 1,1,1,2-tetrafluoroethane, 1,1-difluoroethane, liquids such as various alcohols whose boiling points are below the extrusion temperature, or inorganic gases such as carbon dioxide and nitrogen Etc. These volatile foaming agents can be used in combination.

また、図３に示すように、アッパータンク部１０の開口周縁部１１とロアタンク部２０の開口周縁部２１には、全周に亘りそれぞれ外面から略直角に外側に張り出したフランジ部１２，２２を形成することができる。この場合には、フランジ部１２，２２は、相互に対向して固着されている。フランジ部１２，２２を設けた場合には、アッパータンク部１０とロアタンク部２０の開口周縁部１１、２１の固着面積が増加して、固着力が増大するとともに、気密性も高くなる。   Further, as shown in FIG. 3, flange portions 12, 22 projecting outward from the outer surface at substantially right angles over the entire circumference on the opening peripheral portion 11 of the upper tank portion 10 and the opening peripheral portion 21 of the lower tank portion 20. Can be formed. In this case, the flange portions 12 and 22 are fixed to face each other. When the flange portions 12 and 22 are provided, the fixing area of the opening peripheral portions 11 and 21 of the upper tank portion 10 and the lower tank portion 20 is increased, the fixing force is increased, and the airtightness is increased.

このように、アッパータンク部１０とロアタンク部２０とを射出成形等により金型で別々に成形することができ、寸法精度の高い、強度の強いアッパータンク部１０とロアタンク部２０を得ることができる。このため、アッパータンク部１０とロアタンク部２０の合体部分の精度がよく、緻密に合体した燃料タンク１を得ることができる。また、アッパータンク部１０とロアタンク部２０の内部に内側リブ１６、２６を一体的に設けたり、内蔵部品等を取付けたりすることが容易にできる。   As described above, the upper tank portion 10 and the lower tank portion 20 can be separately formed by a mold by injection molding or the like, and the strong and strong upper tank portion 10 and the lower tank portion 20 can be obtained. . For this reason, the precision of the united part of the upper tank part 10 and the lower tank part 20 is good, and the fuel tank 1 united closely can be obtained. Further, it is possible to easily provide the inner ribs 16 and 26 in the upper tank portion 10 and the lower tank portion 20 or to attach a built-in component or the like.

次に、この燃料タンク１の製造方法について図５〜図６に基づいて説明する。
燃料タンク１は、アッパータンク部１０とロアタンク部２０を別々に金型で成形し、その後、アッパータンク部１０とロアタンク部２０の開口周縁部１１、２１を溶着して製造する。アッパータンク部１０とロアタンク部２０の製造方法は、それぞれ別の金型により成形されるが略同様であり、アッパータンク部１０の製造方法を例にとり説明する。 Next, the manufacturing method of this fuel tank 1 is demonstrated based on FIGS.
The fuel tank 1 is manufactured by separately molding the upper tank portion 10 and the lower tank portion 20 with a mold, and then welding the opening peripheral portions 11 and 21 of the upper tank portion 10 and the lower tank portion 20. Although the manufacturing method of the upper tank part 10 and the lower tank part 20 is shape | molded by a respectively different metal mold, it is substantially the same, and it demonstrates taking the case of the manufacturing method of the upper tank part 10 as an example.

アッパータンク部１０の成形は、図５に示すように、アッパータンク成形金型３０を使用し、射出成形により成形する。
まず、アッパータンク成形金型３０のキャビティ３３に、スプール３４からアッパータンク部１０を形成する上述の合成樹脂を、キャビティ３３の容量よりも少なく、例えば、全量の１／２〜９／１０程度の量を射出する。このとき、上述した化学発泡剤又は物理発泡剤が合成樹脂中に配合されている。化学発泡剤又は物理発泡剤の量を変化させることにより、発泡倍率を制御することができる。 As shown in FIG. 5, the upper tank portion 10 is molded by injection molding using an upper tank molding die 30.
First, the above-described synthetic resin for forming the upper tank portion 10 from the spool 34 in the cavity 33 of the upper tank molding die 30 is smaller than the capacity of the cavity 33, for example, about 1/2 to 9/10 of the total amount. Inject quantity. At this time, the chemical foaming agent or physical foaming agent described above is blended in the synthetic resin. The expansion ratio can be controlled by changing the amount of the chemical foaming agent or the physical foaming agent.

なお、アッパータンク部１０とロアタンク部２０の射出成型において、射出される合成樹脂は、化学発泡剤又は物理発泡剤を含んでおり、キャビティ３３の容量よりも少なく射出されるため、固定型３１と可動型３２の型締め力を小さくすることができる。従って、使用する射出成型機も従来よりも小型のものを使用することができるため、コストを低減することができる。   In the injection molding of the upper tank portion 10 and the lower tank portion 20, the synthetic resin to be injected contains a chemical foaming agent or a physical foaming agent and is injected less than the capacity of the cavity 33. The clamping force of the movable mold 32 can be reduced. Accordingly, since the injection molding machine to be used can be smaller than the conventional one, the cost can be reduced.

このように、射出成形することにより、アッパータンク部１０の形状を正確に成形できる。従って、前述のように寸法精度の高い燃料タンク１を得ることができる。また、使用する合成樹脂の量を低減して、軽量化とコスト低減を図ることができる。
ロアタンク部２０も同様に、ロアタンク成形金型を使用して、射出成形により成形する。ロアタンク部２０は、図５に示すと同様に、内側リブ２６と外側リブ２８が同時に一体的に成形される。
なお、射出成形時に、合成樹脂を注入後、固定型３１と可動型３２を若干開いて、キャビティ３３中の合成樹脂の発泡を促進させることもできる。 In this way, the shape of the upper tank portion 10 can be accurately formed by injection molding. Therefore, the fuel tank 1 with high dimensional accuracy can be obtained as described above. Further, the amount of the synthetic resin to be used can be reduced to reduce the weight and the cost.
Similarly, the lower tank portion 20 is molded by injection molding using a lower tank molding die. In the lower tank portion 20, as shown in FIG. 5, the inner rib 26 and the outer rib 28 are formed integrally at the same time.
During injection molding, after injecting the synthetic resin, the fixed mold 31 and the movable mold 32 can be slightly opened to promote foaming of the synthetic resin in the cavity 33.

次に、アッパータンク部１０とロアタンク部２０を接合する。図６に示すように、アッパータンク部１０の開口周縁部１１のフランジ部１２と、ロアタンク部２０の開口周縁部２１のフランジ部２２の内面、又は内面に設けられた突出部に、熱板５０を当てて溶融し、その後、開口周縁部１１、２１のフランジ部１２、２２を冶具により挟持して、押圧し、フランジ部１２、２２同士を圧着して溶融、接合する。
なお、アッパータンク部１０とロアタンク部２０を接合する前に、燃料タンク１内部に装着するバルブ（図示せず）やポンプユニット５等を、アッパータンク部１０やロアタンク部２０に取付ける。
接合したアッパータンク部１０とロアタンク部２０は、図２と図３に示すように、中空状の燃料タンク１を形成する。 Next, the upper tank part 10 and the lower tank part 20 are joined. As shown in FIG. 6, the heat plate 50 is provided on the inner surface of the flange portion 12 of the opening peripheral edge portion 11 of the upper tank portion 10 and the flange portion 22 of the opening peripheral edge portion 21 of the lower tank portion 20 or the protrusion provided on the inner surface. Then, the flange portions 12 and 22 of the opening peripheral edge portions 11 and 21 are sandwiched and pressed by a jig, and the flange portions 12 and 22 are crimped to be melted and joined.
Before joining the upper tank portion 10 and the lower tank portion 20, a valve (not shown), a pump unit 5, and the like mounted inside the fuel tank 1 are attached to the upper tank portion 10 and the lower tank portion 20.
The joined upper tank portion 10 and lower tank portion 20 form a hollow fuel tank 1 as shown in FIGS.

１ 燃料タンク
１０ アッパータンク部
１１、２１ 開口周縁部
１２、２２ フランジ部
２０ ロアタンク部
３０ 成形金型
４０ 加熱溶融板 DESCRIPTION OF SYMBOLS 1 Fuel tank 10 Upper tank part 11, 21 Opening peripheral part 12, 22 Flange part 20 Lower tank part 30 Molding die 40 Heating and melting plate

Claims (7)

熱可塑性合成樹脂製の燃料タンクにおいて、
該燃料タンクは、分割して別々に射出成形されたアッパータンク部とロアタンク部のそれぞれの開口周縁部が合体されて形成され、
上記アッパータンク部とロアタンク部は、それぞれ発泡倍率１．１〜２．０で発泡された熱可塑性樹脂で形成されたことを特徴とする燃料タンク。 In a fuel tank made of thermoplastic synthetic resin,
The fuel tank is formed by combining the opening peripheral portions of the upper tank portion and the lower tank portion, which are divided and separately injection-molded,
The upper tank portion and the lower tank portion are each formed of a thermoplastic resin foamed at a foaming ratio of 1.1 to 2.0. 上記アッパータンク部とロアタンク部の外壁の肉厚は、３．０〜５．０ｍｍである請求項１に記載の燃料タンク。   2. The fuel tank according to claim 1, wherein a wall thickness of an outer wall of the upper tank portion and the lower tank portion is 3.0 to 5.0 mm. 上記アッパータンク部とロアタンク部は、高密度ポリエチレン（ＨＤＰＥ）、ポリエチレンサルファイド（ＰＰＳ）ゴムアロイ、ポリアセタール、ナイロン、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリフェニレンサルファイドのうち少なくとも１種類の材料から形成される請求項１又は請求項１に記載の燃料タンク。   The upper tank portion and the lower tank portion are formed of at least one material selected from high density polyethylene (HDPE), polyethylene sulfide (PPS) rubber alloy, polyacetal, nylon, polybutylene terephthalate, polyethylene terephthalate, and polyphenylene sulfide. Or the fuel tank of Claim 1. 上記アッパータンク部とロアタンク部のそれぞれの開口周縁部は、全周に亘りそれぞれ略直角に外側に張り出したフランジ部が形成され、該フランジ部は相互に固着された請求項１乃至請求項３のいずれか一項に記載の燃料タンク。   The opening peripheral edge of each of the upper tank and the lower tank is formed with a flange extending outward at a substantially right angle over the entire circumference, and the flange is fixed to each other. The fuel tank as described in any one of Claims. 上記アッパータンク部とロアタンク部は、それぞれ内面から上記タンクの内方向に向かって複数の内側リブが一体的に形成された請求項１乃至請求項４のいずれかに記載の燃料タンク。   The fuel tank according to any one of claims 1 to 4, wherein the upper tank portion and the lower tank portion are each integrally formed with a plurality of inner ribs from the inner surface toward the inward direction of the tank. 上記アッパータンク部とロアタンク部は、それぞれ外面から上記タンクの外方向に向かって複数の外側リブが一体的に形成された請求項１乃至請求項５のいずれかに記載の燃料タンク。   The fuel tank according to any one of claims 1 to 5, wherein the upper tank portion and the lower tank portion are each integrally formed with a plurality of outer ribs from the outer surface toward the outer side of the tank. 上記燃料タンクは、自動車用燃料タンクである請求項１乃至請求項５のいずれかに記載の燃料タンク。   The fuel tank according to any one of claims 1 to 5, wherein the fuel tank is an automobile fuel tank.
JP2012197565A 2012-09-07 2012-09-07 Fuel tank Pending JP2014051215A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015147205A1 (en) * 2014-03-28 2015-10-01 旭有機材工業株式会社 Propylene resin composition, and product selected from tank and piping material molded from propylene resin composition
JP2022515224A (en) * 2018-12-21 2022-02-17 カウテックス テクストロン ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト How to make fuel containers for automobiles and fuel containers for automobiles, and reinforcing members for fuel containers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015147205A1 (en) * 2014-03-28 2015-10-01 旭有機材工業株式会社 Propylene resin composition, and product selected from tank and piping material molded from propylene resin composition
JP2022515224A (en) * 2018-12-21 2022-02-17 カウテックス テクストロン ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト How to make fuel containers for automobiles and fuel containers for automobiles, and reinforcing members for fuel containers

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