WO2018073385A2 - Élément raidisseur pour réservoir à carburant - Google Patents

Élément raidisseur pour réservoir à carburant Download PDF

Info

Publication number
WO2018073385A2
WO2018073385A2 PCT/EP2017/076790 EP2017076790W WO2018073385A2 WO 2018073385 A2 WO2018073385 A2 WO 2018073385A2 EP 2017076790 W EP2017076790 W EP 2017076790W WO 2018073385 A2 WO2018073385 A2 WO 2018073385A2
Authority
WO
WIPO (PCT)
Prior art keywords
tank
stiffening element
plastic
foamed
area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2017/076790
Other languages
German (de)
English (en)
Other versions
WO2018073385A3 (fr
Inventor
Carsten Elsasser
Dirk Eulitz
Roman BOUFFIER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kautex Textron GmbH and Co KG
Original Assignee
Kautex Textron GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kautex Textron GmbH and Co KG filed Critical Kautex Textron GmbH and Co KG
Publication of WO2018073385A2 publication Critical patent/WO2018073385A2/fr
Publication of WO2018073385A3 publication Critical patent/WO2018073385A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/03177—Fuel tanks made of non-metallic material, e.g. plastics, or of a combination of non-metallic and metallic material

Definitions

  • the present invention relates to a tank stiffening element for a fuel tank.
  • Called tank stiffening elements for fuel tanks also called “stand-off” are used to amplify, for example, the force ⁇ fuel tank of hybrid vehicles structurally.
  • Fuel tank of hybrid vehicles have an elevated home withstand nendruckbeaufschlagung, which can mean a positive pressure of up to 350 mbar. In this case, the deformation of the fuel tank should be kept under predetermined internal limits under internal pressure, including the tank stiffening elements are used.
  • Tankwandung and thus destroying the tank bladder comes.
  • Tankverstei- evaporation elements for example, predetermined breaking points, or are configured by joints so that in a crash situation a degree of flexibility is assured in order to avoid destruction of the Tankwan ⁇ dung .
  • a tank stiffening element according to claim 1 and a tank ⁇ stiffening element according to claim 8. Further embodiments of the invention will become apparent from the dependent
  • the invention relates to a tank stiffening element for a fuel tank, wherein the tank stiffening element at least partially from a
  • foamable plastic is produced, with at least one foamed area in which the foamable plastic is foamed.
  • the tank stiffening element has a foamed area, a local weakening of the Tankversteifungsele ⁇ ments in the foamed region can for example be introduced in an injection molding process specifically.
  • the foamed area may have a higher elasticity and / or a lower strength compared to other adjacent areas of the tank stiffening element.
  • the tank stiffening element can therefore be adapted specifically to the static and dynamic loads during operation and also be manufactured inexpensively and in particular in one piece.
  • the tank stiffening element can be manufactured in one piece by injection molding in a single shot.
  • a cost-effective production of the tank stiffener ⁇ tion element can be ensured.
  • a local weakening or a local softening can be deliberately set in the foamed region, wherein the tank stiffening element in this region has, for example, a lower modulus of elasticity than in regions adjacent to the foamed region.
  • the tank reinforcing member connecting portions are provided for connecting the tank stiffening member with a force ⁇ fuel tank, wherein the foamed region between the joint portions is arranged, wherein the connecting portions are at least partially made of the aufCumba ⁇ ren plastic, and wherein the foamable plastic of the foamed area has a lower density than the foamable plastic of the kausab ⁇ sections.
  • the connecting portions are designed in particular to engage with inner walls of a fuel tank welded to the ⁇ .
  • a first connecting portion of the stiffening ⁇ elements may be provided to be welded to a first inner wall of a first half-shell of the fuel tank to ⁇ the.
  • a second connecting portion of the tank stiffening element may be provided to be welded to a two ⁇ th inner wall of a second half-shell of a fuel tank.
  • the half-shells of a fuel tank can be multi-layered ⁇ forms.
  • the half shells may have three or more layers, in particular a barrier layer
  • the barrier layer may be formed as a diffusion barrier for hydrocarbons.
  • a half-shell may have a five-layer wall structure.
  • an objective tank stiffening element may increase the risk of delamination, ie a local resolution of the layer composite of Wandungs adjus be reduced in the crash ⁇ case.
  • the tank stiffening element has two opposite end faces, which are provided at opposite ends of the tank stiffening element at the connecting portions.
  • the end surfaces are adapted to be welded to connecting portions of a fuel tank.
  • a cost-effective, reliable and simple connection of the tank stiffening element to a fuel tank can take place.
  • Due to the lower density of the foamable plastic in the foamed area the foamed area can have a higher elasticity and a lower modulus of elasticity than the foamable plastic of the connecting sections.
  • the connecting sections can be made of a foamable
  • the tank stiffening element it is provided that the connecting sections and / or the foamed area viewed along a longitudinal direction have a constant cross-sectional shape and / or a constant cross-sectional area.
  • the tank stiffening element consists of the foamable plastic on ⁇ .
  • the tank stiffening element can accordingly consist of a single plastic which has been selectively foamed in the foamed area.
  • the tank stiffener element can be produced inexpensively in one piece or in one piece by injection molding.
  • the tank stiffening element can, for example, from a foamable on ⁇ polymer, such as HDPE, POM, PA or the like.
  • the polymer may, for example, have been loaded with an inert gas, in particular nitrogen, as blowing agent in order to be foamed locally during the injection molding process in the foamed region.
  • the foaming can be done by physical foaming or chemical foaming.
  • the tank stiffening element has been produced according to a method with the following method steps:
  • the local change in property can be adjusted in a targeted manner in a foamed region in which the injection molding cavity is locally enlarged. Prior to the local enlargement of the cavity, a complete filling of the cavity with the foamable plastic can take place. Alternatively or in addition, before the local
  • Magnification of the cavity may be provided a Nachdruckphase for filling the cavity.
  • the local increase of the cavity may be performed by an opening movement of a mold slide ⁇ or more mold slide of an injection mold.
  • a mold slide can be moved in a direction away from the cavity-filling, foamable plastic, in order to release further space for expanding or foaming the plastic and to enlarge the cavity.
  • the injection mold may have two oppositely disposed mold slide which moves to Loka ⁇ len enlargement of the cavity in opposite directions apart from each other or may be removed.
  • the foamed area may be arranged in a central central portion of the tank stiffening element.
  • two connection portions may be provided which extend in cantilever fashion from a central, foamed region in opposite directions.
  • the Ver ⁇ bonding portions may extend in each case over identical County ⁇ genab distren along a longitudinal axis so that the tank stiffening element is in particular mirror-symmetrically to a central middle plane. In this way, a homogeneous load of the tank stiffening element and adjacent tank wall sections can be achieved.
  • the foamed area can be arranged with an offset to a central center plane.
  • two connecting portions extending in cantilever fashion from a distributed, the foamed portion in opposite directions.
  • the Ver ⁇ bonding portions can extend so that the tank stiffening element is in particular configured asymmetrically to a central middle plane in each case have different length dimensions along a longitudinal axis.
  • the geometry of the tank stiffening element can be adapted to the expected operating loads ⁇ .
  • the tank stiffening element belongs by a local change in properties in the foamed region of increased flexibility or elasticity of the cross ⁇ section of the tank stiffening element along its entire length, in essence, can be kept constant, so that no local narrowing or constriction of the Tankversteifungsele ⁇ ment along its Longitudinal extension must be made to provide increased elasticity in the event of a crash.
  • the connecting sections and / or the foamed-on area viewed along a longitudinal direction may have a bulge or a taper.
  • the geometry of the tank stiffening element can be adapted to the expected operating loads ⁇ .
  • a tank stiffening element wherein the foamed region or the plastic of the foamed region has a low modulus of elasticity, than a to the on ⁇ foamed region adjacent region or the plastic of the adjoining the foamed region region.
  • the foamed region or the plastic of the foamed region has a low modulus of elasticity, than a to the on ⁇ foamed region adjacent region or the plastic of the adjoining the foamed region region.
  • it may for example be by one or more connecting portions, which are provided with a fuel tank ⁇ for connecting the tank stiffening element.
  • the material properties of the tank stiffening element can be adapted to the expected operating loads.
  • the modulus of elasticity of the area adjacent to the foamed area may be greater by a factor of 1.5 or more than the modulus of elasticity of the foamed area.
  • Example ⁇ example may be the modulus of elasticity of the plastic of the foamed Offs Be ⁇ Reich 1000 MPa, while the modulus of elasticity of the plastic of the adjoining the foamed region region is 1500 MPa or more.
  • the invention relates to a
  • Tank stiffener for a fuel tank with connecting portions and with a decoupling region, wherein the connecting portions are provided for connecting the Tankversteifungsele- ment with the fuel tank, wherein decoupling region is arranged between the connecting portions, wherein the connecting portions comprise a first plastic, wherein the decoupling region comprises a second plastic wherein the decoupling region has been positively and / or materially connected to the connecting sections by a multi-component injection molding process.
  • the Coreback technique for example, the Coreback technique, the turntable technology, the insert technology or the Umsetztechnik can be used.
  • the Coreback technique By encapsulating, overmolding, back-molding and / or injection molding of the plastics to be joined in the multi-component injection molding ⁇ method can easily a cohesive and / o ⁇ a positive and / or non-positive
  • a tank stiffening element may be provided, wherein the first plastic has a hö ⁇ heren modulus than the second plastics,
  • the modulus of elasticity of the first plastic has a modulus of elasticity that is greater by a factor of 1.5 or more than the modulus of elasticity of the second plastic. So the Materialei ⁇ properties of the tank stiffening element can be adapted to the expected operating loads.
  • the modulus of elasticity of the second plastic may be 1000 MPa while the modulus of elasticity of the second plastic is 1500 MPa or more.
  • the first and / or the second plastic material can be made of a Po ⁇ lyethylen, polyamide, rubber or polyoxymethylene.
  • the first plastic is a polyamide and the second plastic is a polyethylene.
  • a polyamide, polyethylene, polyoxy methylene ⁇ or a polyamide may be, for example, the first plastic, while the second plastic is a rubber, in particular a synthetic or natural rubber.
  • the second plastic is a particularly brittle plastic which is more brittle than the first plastic to vorzu a predetermined breaking point on the tank reinforcing member see ⁇ .
  • an improved, tank reinforcing element for a fuel tank can thus be specified by the invention, which is inexpensive to produce, enables reliable stiffening of a fuel tank and in particular reduces the risk of fuel leakage in the event of a crash.
  • FIG. 1 is a tank stiffening element in the fully assembled stand to ⁇ ;
  • Fig. 2 shows cross-sectional shapes of a tank stiffening element;
  • FIG. 3 shows a tank stiffening element in an injection mold
  • Fig. 4 shows a further tank stiffening element in the finished mon ⁇ oriented state.
  • FIG. 1 shows a tank stiffening element 2 according to the invention for a fuel tank 4.
  • FIG. 1 shows a partial section through a fuel tank 4 provided with a plurality of stiffening elements.
  • the fuel tank 4 has an upper half shell 6 and a lower half shell 8.
  • the tank stiffening element 2 is made of a foamable plastic.
  • the tank stiffening element 2 has a foamed area 10, in which the foamable plastic is foamed.
  • the tank stiffening element 2 has connecting sections 12, 14.
  • the connecting sections 12, 14 are provided for connecting the tank stiffening element 2 to the fuel tank 4 or its half shells 6, 8.
  • the foamed area 10 is arranged between the connection sections 12, 14.
  • the connecting portions 12, 14 are in this case made of the foamable plastic.
  • the foamable plastic of the foamed region 10 has a lower density than the foamable art ⁇ material of the connecting portions 12,14. In this way, the mechanical properties of the tank stiffening element 2 in the foamed region 10 have been deliberately changed.
  • the connecting sections 12, 14 are connected to one another via the foamed area.
  • Connecting portion 12 is materially connected to a connecting portion 16 of the upper half-shell 6 of the fuel tank 4.
  • Connecting portion 14 is connected to a connecting portion 18 of the lower half shell 8 of the fuel tank 4.
  • the connection of the connecting portion 12 and the connecting portion 16, or the connecting portion 14 and the connecting portion 18 has been formed as a cohesive connection by welding.
  • the connecting sections 16, 18 of the upper half-shell 6 and the lower half-shell 8 each have radii 20 or fillets 20 in order to avoid a notch effect or load peaks or delamination when transmitting tensile forces via the tank stiffening element 2.
  • the tank stiffening element 2 can have a constant cross-sectional shape and / or a constant cross-sectional area viewed along a longitudinal direction or along a longitudinal axis L.
  • the tank stiffener ⁇ element 2 can for example be made circular solid material (Fig. 2A).
  • the tank stiffening element 2 may have an annular cross-section (FIG. 2B).
  • the tank stiffening element 2 may have a polygonal cross-sectional shape, for example a quadrangular or square cross-sectional shape (FIG. 2C).
  • the stiffening element 2 can have ribs or web-like structures to ge ⁇ targets the transverse and / or bending elasticity of the tank stiffening element 2 adapted to the load occurring during operation cases. ( Figures 2D, 2E, 2F).
  • the tank stiffening element may, for example, comprise webs 22 or struts 22 (FIGS. 2D, 2E, 2F, 2G).
  • the webs 22 or struts 22 can end converge in an end surface 24 serving as a connecting portion for connecting the Tankverstei ⁇ Fung elements 2 with connecting sections 16, 18 of a motor ⁇ fuel tank 4 respectively at Chrysler
  • Fig. 2G the Tankverstei ⁇ tion element 2
  • the following process steps are performed:
  • the injected into the injection mold 28 and the cavity 26 of the molten plastic 30, in this case HDPE, is loaded with nitrogen as blowing agent.
  • the injection mold has two half-shells 32, 34, each having mold slides 36, 38. After the cavity 26 has been completely filled with the plastic 30, there is a holding pressure phase to compensate for a shrinkage of the plastic and to ensure a complete filling of the cavity 26.
  • the first inserted into the cavity 26 mold slides 36, 38 are now moved apart in opposite directions, as shown by the arrows in Fig. 3. In this way, the cavity 26 is locally enlarged.
  • the first FLÜS ⁇ sig or dissolved This nitrogen passes through this local enlargement of the cavity 26 and the associated pressure drop of the liquid in the gas phase and causing in this way a local foaming of the plastic 30 in the loading area of the enlarge the cavity. In this way, the mechanical properties of a produced tank stiffening element can be adjusted.
  • the foamed region is formed in a central middle region of the tank stiffening member so that the stiffening element in the tank Wesentli ⁇ chen is designed mirror-symmetrically to a central middle plane M.
  • the connecting sections 12, 14 of the finished tank stiffening element 2 therefore have an identical length dimension measured along the longitudinal axis L.
  • FIG. 4 shows a further stiffening element 40 for a fuel tank 4.
  • the stiffening element 40 has connecting portions 42, 44 and a decoupling region 46.
  • the connecting portions 42, 44 are provided for connecting the tank ⁇ stiffening element 40 to the fuel tank.
  • the fuel tank 4 in turn has an upper half shell 6 and a lower half shell 8, wherein the half shells 6, 8 are respectively associated with connecting portions 16, 18 to connect the stiffening element 40.
  • a cohesive connection has been made by welding.
  • the decoupling region 46 is disposed between the connecting portions 42, 44.
  • the connecting portions 42, 44 have a first plastic and the decoupling region 46 has a second plastic.
  • the decoupling region 46 has been connected to the connecting sections 42, 44 in a form-fitting and cohesive manner by a multi-component injection molding process.
  • the second plastic has vorlie ⁇ quietly a lower modulus of elasticity and a higher elasticity than the first plastics material.
  • the modulus of elasticity of the first plastic is greater by a factor of 1.5 than the modulus of elasticity of the second
  • Plastic According to alternative embodiments can be provided that it is in the second plastic is a particularly brittle plastic which is more brittle than the first plastic, in order to watch a predetermined breaking point on the tank reinforcing member 40 before ⁇ .

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un élément raidisseur (2) pour un réservoir de carburant (4), l'élément raidisseur (2) étant constitué au moins en partie d'une matière plastique expansible (30), ledit élément comprenant au moins une zone expansée (10) dans laquelle la matière plastique expansible (30) est expansée.
PCT/EP2017/076790 2016-10-21 2017-10-19 Élément raidisseur pour réservoir à carburant Ceased WO2018073385A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016220693.1 2016-10-21
DE102016220693.1A DE102016220693B4 (de) 2016-10-21 2016-10-21 Tankversteifungselement für einen Kraftstofftank

Publications (2)

Publication Number Publication Date
WO2018073385A2 true WO2018073385A2 (fr) 2018-04-26
WO2018073385A3 WO2018073385A3 (fr) 2018-06-14

Family

ID=60245065

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/076790 Ceased WO2018073385A2 (fr) 2016-10-21 2017-10-19 Élément raidisseur pour réservoir à carburant

Country Status (2)

Country Link
DE (1) DE102016220693B4 (fr)
WO (1) WO2018073385A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018127258A1 (de) 2018-10-31 2020-04-30 Bayerische Motoren Werke Aktiengesellschaft Kraftstofftank eines Kraftfahrzeugs mit einem Versteifungselement

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912107A (en) * 1971-04-26 1975-10-14 Cegedur Mobile liquid storage tanks
DE3524881A1 (de) * 1985-07-12 1987-01-22 Elkamet Werk Behaelter fuer fluessigkeiten, insbesondere kraftstofftank aus thermoplastischem kunststoff und verfahren zu dessen herstellung
DE4408426A1 (de) * 1994-03-12 1995-09-14 Krauss Maffei Ag Verfahren zum Herstellen dickwandiger Kunststoff-Artikel
JP5107955B2 (ja) * 2008-03-14 2012-12-26 株式会社Ｆｔｓ 自動車用燃料タンク
KR20140022412A (ko) * 2011-04-12 2014-02-24 이너지 오토모티브 시스템즈 리서치 (소시에떼 아노님) 향상된 기계 저항성을 갖는 연료 탱크
DE102013003247A1 (de) 2013-02-27 2014-09-11 Kautex Textron Gmbh & Co. Kg Kraftstoffbehälter
EP2865553B1 (fr) 2013-10-25 2016-06-22 Inergy Automotive Systems Research (Société Anonyme) Réservoir comprenant un élément de renforcement et procédé de fabrication d'un tel élément de renforcement
DE102013018922B4 (de) * 2013-11-13 2017-02-02 Kautex Textron Gmbh & Co. Kg Betriebsflüssigkeitsbehälter mit Sollbruchstelle
FR3034340A1 (fr) * 2015-04-03 2016-10-07 Inergy Automotive Systems Research Sa Procede de fabrication d'un reservoir en matiere plastique avec dispositif anti-ballottement.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
WO2018073385A3 (fr) 2018-06-14
DE102016220693A1 (de) 2018-04-26
DE102016220693B4 (de) 2023-09-28

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