JP2009036271A - Piping member used for gasoline fuel piping of automobile and cylindrical protector covering fuel hose used for gasoline fuel piping of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide piping member used for gasoline fuel piping of an automobile with a thermal insulation function as well as barrier property by a resin layer. <P>SOLUTION: A first fuel hose 29 consists of the resin layer 31 as a barrier layer with permeability resistance to a gasoline fuel, an outer rubber layer 33 as an outer surface rubber layer outside this resin layer 31, an inner rubber layer 35 as an inner surface rubber layer inside the resin layer 31. For the inner rubber layer 35, NBR (acrylonitrile butadiene rubber: with an amount of acrylonitrile of ≥30 wt.%, more preferably, ≥37.5 wt.%) is used, and for the outer rubber layer 33, NBR+PVC is used. Moreover, for an intermediate resin layer 31, THV is used. In the outer rubber layer 33, hollow filler with an average particle diameter of 15-135 μm with silicate glass as a main component is blended. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a piping member used for automobile gasoline fuel piping such as a fuel hose and a gasoline fuel tank for transferring gasoline fuel, and a cylindrical protector for covering the fuel hose.

  In recent automobile piping, it is necessary to take measures to prevent gasoline fuel from being scattered in the atmosphere from the viewpoint of global environmental conservation. Therefore, for example, a general rubber material such as NBR + PVC (a blend of acrylonitrile butadiene rubber and polyvinyl chloride) that has been excellent in vibration absorption and assemblability has been used for the fuel hose. , Gasoline fuel permeation resistance or low permeability resin layer better than the rubber layer is laminated on the rubber layer as a barrier layer to form a low permeability resin composite hose and applied to the fuel hose in many cases. (See Patent Document 1). Or the resin hose which has only a resin layer for a fuel hose is often used.

  However, fuel permeation regulations are expected to increase in the future. Therefore, a metal composite hose having a metal bellows tube as an inner layer is also used as a fuel hose (see Patent Document 2), but the metal composite hose is expensive and heavy and inferior in handleability.

JP 2003-159714 A JP-A-2005-282673 JP-A-2005-239777

  Therefore, it is necessary to increase the low gasoline fuel permeability of the resin composite hose or resin hose, but the permeation of gasoline fuel from the hose is due to the vaporization of the gasoline fuel in the hose and the generation of evaporation gas. Therefore, even when the ambient temperature of the resin composite hose or the resin hose becomes high due to the heat generated by the automobile engine or the radiant heat of sunlight, the heat insulation function that can suppress the temperature rise of the gasoline fuel in the hose is provided. If the resin hose has, the low gasoline fuel permeability of the hose is improved.

  Then, this invention aims at provision of the member for piping used for the gasoline fuel piping of a motor vehicle which has a heat insulation function with the barrier property by a resin layer. Another object of the present invention is to provide a cylindrical protector that adds a heat insulation function to an automobile gasoline fuel hose having a barrier property by a resin layer.

  In order to achieve this object, a pipe member of the present invention is a pipe member used for a gasoline fuel pipe of an automobile having a resin layer as a barrier layer having gasoline fuel permeation resistance, and having an average particle size of 10 Or 150 μm hollow filler (for example, a hollow spherical filler) is blended. The present invention can be applied to a fuel hose and a fuel tank. Since the hollow filler has a low thermal conductivity due to the hollow portion, the thermal insulation of the piping member can be improved by blending the hollow filler. If the average particle size of the hollow filler is less than 10 μm, the hollow portion of the hollow filler is too small to ensure sufficient heat insulation. Moreover, when the average particle diameter of a hollow filler exceeds 150 micrometers, characteristics, such as the elasticity of the layer mix | blended, will fall. The average particle size of the hollow filler is more effectively 20 to 80 μm. In order to increase the affinity between the hollow filler and the rubber or resin that is the base material of the piping member, it is effective to use a hollow filler that has been surface-treated. As a hollow filler, what has a silicate glass as a main component can be used, for example. Such a hollow filler is inexpensive and has high heat insulating properties. Moreover, if what used glass or silicon as the main raw material is used, it will become possible to mix | blend various metal materials.

  It is preferable that the hollow filler is blended in the outer layer of the resin layer. If comprised in this way, the heat insulation function can be given to the member for piping, without impairing the barrier property of a resin layer. When the piping member has two or more resin layers, for example, a hollow filler can be blended in the outermost resin layer.

  By the way, although the rubber hose which mix | blended the hollow filler is described in patent document 3, the objective of mix | blending a hollow filler is high electrical resistance of a water-system hose, the invention of patent document 3, and the member for fuel piping This is different from the present invention intended for heat insulation.

  Further, the cylindrical protector of the present invention is a cylindrical protector for covering a fuel hose used for a gasoline fuel pipe of an automobile provided with a resin layer as a barrier layer having gasoline fuel permeation resistance, and having an average particle diameter. A hollow filler of 10 to 150 μm, preferably 20 to 80 μm is blended. Here, the barrier property is secured by the resin layer of the fuel hose, and the heat insulation property is secured by the cylindrical protector.

  As described above, by using the piping member or the cylindrical protector of the present invention, the permeation of gasoline fuel from the automobile fuel piping can be kept low.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view of an automobile fuel piping structure in which a fuel hose and a fuel tank are used as piping members according to the present invention.

  In the automobile fuel piping structure 1, a fuel gun (not shown) is inserted into a filler pipe 5 attached to the filler hose 3 from a fuel filler port 7, and gasoline fuel is supplied into the fuel tank 9 through the filler hose 3. . The gasoline fuel in the fuel tank 9 is sent to the engine side through the feed passage 13 by the fuel pump 11. A communication pipe 15 is branched from the upper side of the filler pipe 5, and the distal end portion of the communication hose 17 connected to the communication pipe 15 is connected to the fuel tank 9 via the attachment pipe 19. Extends into the fuel tank 9 so as to reach the gasoline level when the tank is full. The refueling gun is configured with an automatic refueling stop mechanism (not shown) that operates by detecting that the tip of the mounting pipe 19 is buried in the liquid gasoline fuel, that is, the gasoline fuel is full. Yes. An evaporation hose 23 is connected to the upper side of the fuel tank 9 via a rollover valve 21, and the gasoline fuel gas filled in the fuel tank 9 is sent to the canister 25 through the evaporation hose 23. The rollover valve 21 is closed when the automobile falls or the like, and prevents liquid gasoline fuel from flowing into the evaporation hose 23. The gasoline fuel gas sent from the evaporation hose 23 to the canister 25 is led to the engine side intake passage through the canister drain passage 27 in the low load operation state. Since the feed passage 13, the evaporation hose 23, and the canister drain passage 27 are piped under the floor, the surroundings tend to be hot.

  FIG. 2 is a perspective view showing a laminated structure of the first fuel hose used in the automobile fuel piping structure 1.

  The first fuel hose 29 includes a resin layer 31 as a barrier layer that is resistant to gasoline fuel, an outer rubber layer 33 as an outer rubber layer outside the resin layer 31, and an inner side of the resin layer 31. And an inner rubber layer 35 as an inner rubber layer. The adhesion strength of each layer is 10 N / 25 mm or more, and the layers are firmly adhered to each other. However, the peeling evaluation is performed on the assumption that peeling occurs when the sample base material is broken. The first fuel hose 29 can be used as the communication hose 17, for example, and can also be used for the feed passage 13 and the canister drain passage 27.

  The inner rubber layer 35 is composed of NBR (acrylonitrile butadiene rubber: acrylonitrile amount of 30% by weight or more, preferably 37.5% by weight or more), NBR + PVC (polyvinyl chloride) (acrylonitrile amount of 30% by weight or more, preferably 37.5% by weight). % Or more), FKM (fluoro rubber), H-NBR (hydrogenated NBR), or the like, and a thickness of 1.0 mm to 2.5 mm (or approximately 2.5 mm). The outer rubber layer 33 is NBR + PVC, ECO (epichlorohydrin-ethylene oxide copolymer rubber), CSM (chlorosulfonated polyethylene rubber), NBR + ACM (acrylic rubber), NBR + EPDM (ethylene-propylene-diene rubber), EPDM + IIR (butyl rubber), EPDM, or the like. , And a thickness of 1.0 mm to 3.0 mm (or approximately 3.0 mm). The intermediate resin layer 31 includes THV (a thermoplastic fluororesin made of a terpolymer of vinylidene fluoride, propylene hexafluoride, and tetrafluoroethylene), and ETFE (a copolymer of ethylene tetrafluoroethylene). Using a fluororesin such as PVDF (polyvinylidene fluoride) or a nylon resin such as PA11 (nylon 11) or PA12 (nylon 12), the thickness is 0.03 mm to 0.3 mm (or approximately 0.3 mm). Has been.

  The outer rubber layer 33 contains silicate glass as a main component and a hollow filler having an average particle diameter of 15 to 135 μm (for example, trade name “Scotchlite Glass Bubbles” Sumitomo 3M Limited). 35 may be blended with a hollow filler having an average particle diameter of 15 to 135 μm. The first fuel hose 29 has an excellent heat insulating property due to the blended hollow filler.

  FIG. 3 is a perspective view showing a laminated structure of a second fuel hose used in the automobile fuel piping structure 1.

  The second fuel hose 37 has an intermediate rubber layer 39 formed on the inner side of the resin layer 31 and an inner rubber layer 41 formed on the inner side of the intermediate rubber layer 39. It is the same as the fuel hose 29. The second fuel hose 37 can also be used, for example, as the communication hose 17 and can be used for the feed passage 13 and the canister drain passage 27. Also, in the second fuel hose 37, the adhesion strength of each layer is 10 N / 25 mm or more, and the layers are firmly adhered to each other, but the peeling evaluation is performed when the sample base material is broken. This is done as a result of The inner rubber layer 41 is made of FKM, NBR (acrylonitrile amount 30 wt% or more, preferably 37.5 wt% or more), NBR + PVC (acrylonitrile amount 30 wt% or more, preferably 37.5 wt% or more), etc. The wall thickness is 0.2 mm to 1.0 mm (or approximately 1.0 mm). The intermediate rubber layer 39 is made of NBR (acrylonitrile amount of 30% by weight or more, preferably 37.5% by weight or more), NBR + PVC (acrylonitrile amount of 30% by weight or more, preferably 37.5% by weight or more), etc. The wall thickness is 1.0 mm to 2.0 mm (or almost 2.0 mm).

  The outer rubber layer 33 contains silicate glass as a main component and a hollow filler having an average particle diameter of 15 to 135 μm (for example, trade name “Scotchlite Glass Bubbles”, Sumitomo 3M Limited). 39 and / or the inner rubber layer 41 may be blended with a hollow filler having an average particle diameter of 15 to 135 μm. The second fuel hose 37 has an excellent heat insulating property due to the blended hollow filler.

  FIG. 4 is a perspective view showing a laminated structure of a third fuel hose used in the automobile fuel piping structure 1.

  The third fuel hose 43 includes an inner resin layer 45 as an inner surface resin layer having permeation resistance to gasoline fuel, and an outer surface outside the inner resin layer 45 that also has permeation resistance to gasoline fuel. A two-layer laminated structure having an outer resin layer 47 as a resin layer is provided. Here, the adhesion strength between the two layers is 10 N / 25 mm or more, and the two layers are firmly adhered to each other. However, in the peeling evaluation, peeling occurred when the base material of the sample was broken. It is done as a thing. The third fuel hose 43 can be used as, for example, the filler hose 3 and the evaporation hose 23, and can be used for the feed passage 13 and the canister drain passage 27.

  The inner resin layer 45 is made of a fluororesin such as THV, ETFE, PVDF, or a nylon resin such as PA11 (nylon 11) or PA12 (nylon 12), and has a thickness of 0.05 mm to 0.5 mm (or almost 0.5 mm). ). The outer resin layer 47 is formed to a thickness of 1.0 mm to 1.5 mm (or approximately 1.5 mm) using nylon resin such as PA11 (nylon 11) and PA12 (nylon 12).

  The outer resin layer 47 contains silicate glass as a main component and a hollow filler having an average particle size of 15 to 60 μm (for example, trade name “Scotchlite Glass Bubbles” Sumitomo 3M Limited). 45 may be blended with a hollow filler having an average particle diameter of 15 to 60 μm. The third fuel hose 43 has an excellent heat insulating property due to the blended hollow filler.

  FIG. 5 is a perspective view showing a laminated structure of a fourth fuel hose used in the automobile fuel piping structure 1.

  The fourth fuel hose 49 has an inner resin layer 51 as an inner resin layer that is resistant to gasoline fuel and an outer side outside the inner resin layer 51 that is also resistant to gasoline fuel. A three-layer structure having a resin layer 53 and an outer rubber layer 55 as an outer rubber layer outside the outer resin layer 53 is provided. Here, the adhesion strength of each layer is 10 N / 25 mm or more, and the layers are firmly adhered to each other. However, the peeling evaluation is performed assuming that peeling occurs when the sample base material is broken. ing. The fourth fuel hose 49 can be used as, for example, the filler hose 3 and the evaporation hose 23, and can be used in the feed passage 13 and the canister drain passage 27.

  The inner resin layer 51 is formed to a thickness of 0.05 mm to 0.5 mm (or approximately 0.5 mm) using a fluorine resin such as THV, ETFE, PVDF, or a nylon resin such as PA11, PA12. The outer resin layer 53 is formed to a thickness of 1.0 mm to 1.5 mm (or approximately 1.5 mm) using nylon resin such as PA11 and PA12. The outer rubber layer 55 is formed to a thickness of 0.5 mm to 2.0 mm (or about 2.0 mm) using NBR + PVC, NBR + EPDM, EPDM, or the like.

  The outer rubber layer 55 contains silicate glass as a main component and a hollow filler having an average particle size of 15 to 135 μm (for example, trade name “Scotchlite Glass Bubbles” Sumitomo 3M Limited). 51 and / or the outer resin layer 53 may be blended with a hollow filler having an average particle diameter of 15 to 135 μm. The fourth fuel hose 49 has an excellent heat insulating property due to the blended hollow filler.

  FIG. 6 is a cross-sectional view showing the laminated structure of the fuel tank 9.

  The fuel tank 9 (the peripheral wall of the fuel tank 9) includes an inner resin layer 57 as an inner resin layer, a first intermediate resin layer 59 outside the inner resin layer 57, and a first outer resin layer 59 outside the first intermediate resin layer 59. 4 types and 6 layers laminated structure (laminated structure of 4 types of layers and 2 adhesive layers) having 2 intermediate resin layers 61 and an outer resin layer 63 as an outer surface resin layer outside the second intermediate resin layer 61 It has. The inner resin layer 57 is formed to be 1.0 mm to 10.0 mm (or about 10.0 mm) using HDPE (high density polyethylene) or PE (polyethylene), and the first intermediate resin layer 59 is EVOH (ethylene vinyl). Alcohol), PPS (polyphenylene sulfide), PBN (polybutylene naphthalate) or PBT (polybutylene terephthalate) is used to form 1.0 mm to 10.0 mm (or about 10.0 mm). The second intermediate resin layer 61 is a recycled material layer formed to 1.0 mm to 10.0 mm (or about 10.0 mm) using burrs generated when the resin layer of the fuel tank 9 is molded. The second intermediate resin layer 61 includes only burrs when the inner resin layer 57 is molded, only burrs when the first intermediate resin layer 59 is molded, only burrs when the second intermediate resin layer 61 is molded, or when the outer resin layer 63 is molded. Only burr can be used as a material. Alternatively, the second intermediate resin layer 61 can be made of a material obtained by appropriately combining and mixing the burrs of the four resin layers 57, 59, 61, and 63. That is, the burrs of the two resin layers can be mixed and used as a material, such as the burrs of the inner resin layer 57 molding and the burrs of the first intermediate resin layer 59 molding. 57, burrs of any three resin layers such as burrs of the first intermediate resin layer 59 and the outer resin layer 63 can be mixed and used as a material. Furthermore, the burrs of all the resin layers can be mixed to make a material. The outer resin layer 63 is formed to be 1.0 mm to 10.0 mm (or about 10.0 mm) using HDPE or PE. It should be noted that an adhesive having a thickness of 1.0 mm to 2.0 mm is provided between the inner resin layer 57 and the first intermediate resin layer 59 and between the first intermediate resin layer 59 and the second intermediate resin layer 61, respectively. A layer 65 is provided. .

  The second intermediate resin layer 61 and the outer resin layer 63 contain a hollow filler (for example, “Scotchlite Glass Bubbles” Sumitomo 3M Co., Ltd.) having a silicate glass as a main component and an average particle diameter of 15 to 135 μm. ing. The fuel tank 9 has an excellent heat insulating property due to the blended hollow filler.

  Note that at least the hose whose outermost layer is a resin layer is likely to be damaged when it comes into contact with peripheral parts, so it may be covered with a rubber cylindrical protector.However, if a hollow filler is added to the protector Even if a hollow filler is not blended in the hose, it is possible to ensure a sufficient heat insulating function to suppress the generation of evaporation gas. For example, as shown in FIG. 7, such a protector is made of a material obtained by blending a rubber material such as NBR + PVC, NBR + EPDM or EPDM with a silicate glass as a main component and a hollow filler having an average particle size of 15 to 135 μm. The cylindrical body 67 having a thickness of 0.5 mm to 2.0 mm (or approximately 2.0 mm) can be formed.

  By the piping member and the cylindrical protector of the present invention, the low fuel permeability of the gasoline fuel piping of the automobile is improved.

It is the schematic of the fuel piping structure for motor vehicles in which the fuel hose and fuel tank as a piping member which concern on this invention are used. It is a perspective view which shows the laminated structure of the 1st fuel hose used for the fuel piping structure for motor vehicles. It is a perspective view which shows the laminated structure of the 2nd fuel hose used for the fuel piping structure for motor vehicles. It is a perspective view which shows the laminated structure of the 3rd fuel hose used for the fuel piping structure for motor vehicles. It is a perspective view which shows the laminated structure of the 4th fuel hose used for the fuel piping structure for motor vehicles. It is sectional drawing which shows the laminated structure of a fuel tank. It is a perspective view of the cylindrical protector which concerns on this invention.

Explanation of symbols

9 Fuel tank 29 First fuel hose 31 Resin layer
37 Second fuel hose 43 Third fuel hose 45, 51, 57 Inner resin layer 47, 63 Outer resin layer
49 Fourth fuel hose 53 Outer resin layer 59 First intermediate resin layer 61 Second intermediate resin layer

Claims (5)

A member for piping used for automobile gasoline fuel piping, comprising a resin layer as a barrier layer having gasoline fuel permeation resistance,
A piping member used for automobile gasoline fuel piping, wherein a hollow filler having an average particle size of 10 to 150 μm is blended. The piping member used for gasoline fuel piping of an automobile according to claim 1, wherein the piping member is a fuel hose. The piping member used for gasoline fuel piping of an automobile according to claim 1, wherein the piping member is a fuel tank. The piping member used for the gasoline fuel piping of the automobile according to claim 1, wherein the hollow filler is blended in an outer layer of the resin layer. A cylindrical protector for covering a fuel hose used for gasoline fuel piping of an automobile, comprising a resin layer as a barrier layer having gasoline fuel permeation resistance,
A cylindrical protector for covering a fuel hose used in a gasoline fuel pipe of an automobile, wherein a hollow filler having an average particle diameter of 10 to 150 μm is blended.

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