WO2017221450A1 - Filler tube structure - Google Patents

Filler tube structure Download PDF

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Publication number
WO2017221450A1
WO2017221450A1 PCT/JP2017/002826 JP2017002826W WO2017221450A1 WO 2017221450 A1 WO2017221450 A1 WO 2017221450A1 JP 2017002826 W JP2017002826 W JP 2017002826W WO 2017221450 A1 WO2017221450 A1 WO 2017221450A1
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WO
WIPO (PCT)
Prior art keywords
filler
stainless steel
filler tube
cap protector
tube
Prior art date
Application number
PCT/JP2017/002826
Other languages
French (fr)
Japanese (ja)
Inventor
悦徳 齊藤
高松　修
利宜 山本
信英 鈴木
輝悟 安東
晃志郎 川上
Original Assignee
ユニプレス株式会社
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 ユニプレス株式会社 filed Critical ユニプレス株式会社
Priority to JP2017531417A priority Critical patent/JPWO2017221450A1/en
Publication of WO2017221450A1 publication Critical patent/WO2017221450A1/en

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    • 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
    • B60K15/04—Tank inlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/02—Rigid pipes of metal

Definitions

  • the present invention relates to a filler tube structure for supplying fuel into a fuel tank for storing gasoline fuel or light oil fuel as a power source of an engine such as an automobile.
  • This type of filler tube structure in the prior art includes, for example, a filler tube main body portion whose one end is connected to the fuel tank side, and a filler neck portion integrally formed on the other end side of the filler tube main body portion and configured as a fuel filler port portion. And the filler tube is comprised. One end side of the filler neck portion is fitted to the other end side of the filler cap protector attached to the vehicle body panel. The filler neck part is attached to the filler cap protector by welding a fitting part between the filler cap protector and the filler neck part.
  • the filler tube main body constituting the filler tube is mainly composed of a substantially straight tube-shaped portion in the longitudinal direction.
  • the filler neck part which comprises a filler tube similarly is comprised by expanding and forming in a trumpet shape toward the front-end
  • the filler tube main body portion and the filler neck portion are made of resin, aluminum (hereinafter abbreviated as “aluminum”), or stainless steel. Many are configured by integrally forming a steel material (see the description of Patent Document 1 and Patent Document 4 as disclosing related techniques).
  • the filler tube composed of the resin integrally molded product described in Patent Document 1 or the filler tube composed of the aluminum integrally molded product described in Patent Document 2 is installed in the vehicle body together with the fuel tank. . Therefore, when an automobile encounters a collision accident or the like, it may present a difficulty in terms of strength and rigidity for exerting the airtight function of the fuel tank. Therefore, conventionally, a filler tube made of a stainless steel material as described in Patent Document 3 or Patent Document 4 is widely used so as to exhibit high strength rigidity. Because the stainless steel filler tube has high strength and rigidity, it is excellent in high corrosion resistance in salty environments such as muddy water splashed during driving of a car or driving near the coast, and long-term airtightness maintenance. Because it is.
  • the integral filler tube that integrally forms the filler tube body and filler neck made of stainless steel is attached to the vehicle body via a grommet made of rubber or other elastic material with a filler cap protector interposed. It is configured to be. Both the filler cap protector and filler tube achieve high corrosion resistance in a salt damage environment such as muddy water scattered during driving of a car or driving near the coast, or maintaining airtightness for a long period of time. From the viewpoint of cost advantage, the stainless steel material is used.
  • the filler neck part and the filler cap protector in the integral filler tube are assembled to each other by being welded, for example, by spot welding or the like in a state where both are fitted to each other.
  • the weld gap in which the oxygen concentration cell containing chlorine ions and the like is thus formed is formed by overlapping the filler neck portion and the filler cap protector made of a stainless steel material having the same potential.
  • crevice corrosion due to the oxygen concentration cell occurs, and the oxide film formed on the surface of the stainless steel material constituting the filler neck portion and the filler cap protector is chloride ions constituting the oxygen concentration cell, etc. Will be destroyed.
  • the corrosion resistance of the filler neck portion and the filler cap protector constituting the weld gap deteriorates due to the crevice corrosion caused by the so-called oxygen concentration cell.
  • crevice corrosion by such an oxygen concentration cell proceeds, there is a possibility of developing to perforation corrosion.
  • the filler tube A in the filler tube structure according to the conventional example of this type is configured by using a ferritic stainless steel material, and the filler neck auxiliary body separately formed in the filler neck portion a-1.
  • a double pipe method is adopted in which a-2 is fitted and swaged to each other, and the filler neck part a-1 is fitted to a separate filler neck auxiliary body a-2.
  • the sealing material B is fitted and elastically provided to form an airtight structure.
  • the filler neck portion a-1 is also connected to the other end of the filler cap protector D, one end of which is attached to the vehicle body panel C via the grommet F.
  • the filler neck protector D is attached to the filler cap protector D by welding a fitting portion E between the filler neck portion a-1 and the filler cap protector D.
  • the filler neck part a-1 and the filler cap protector D are welded to each other in a fitted state by spot welding or the like. As a matter of course, a small welding gap is formed.
  • the filler neck portion a-1 and the filler cap protector D achieve high strength rigidity and high corrosion resistance in a salty environment such as muddy water scattered during driving of the automobile or driving near the coast, or long.
  • a salty environment such as muddy water scattered during driving of the automobile or driving near the coast, or long.
  • both are made of the same ferritic stainless steel material.
  • the filler neck portion a-1 and the filler cap protector D are both made of the same ferritic stainless steel material and have the same potential (V). .
  • V potential
  • a solution composed of scattered muddy water or seawater that has entered through the welding gap causes crevice corrosion due to the oxygen concentration cell in a small welding gap and makes the thin oxide film on the surface of the member unstable. As a result, the oxide film is destroyed. When the destruction of the oxide film proceeds, there is a possibility that perforation corrosion occurs in the filler neck portion a-1 or the filler cap protector D.
  • the sealing material B is caulked and fitted to the fitting portion between the filler neck portion a-1 and the filler neck portion auxiliary body a-2 made separately, Provide elastically.
  • Such a sealing material B is arranged on the upstream side of the fitting portion between the filler neck portion a-1 and the filler neck auxiliary body a-2 made separately, that is, on the fuel tank side (not shown) to constitute the sealing portion. It is doing.
  • the filler tube A includes a filler neck auxiliary body a-2 separately formed in addition to the filler neck part a-1 and the filler tube body part a-3 that are integrally formed with each other. Is constituted by a double tube system.
  • the sealing material B is interposed between the filler neck portion a-1 and the separate filler neck auxiliary body a-2 to maintain the airtightness. Therefore, the conventional example shown in FIG. 8 brings about an increase in the number of parts as compared with the conventional example in which a separate filler neck auxiliary body a-2 as shown in Patent Document 3 or Patent Document 4 is not used. At the same time, the assembly man-hours become large. Therefore, even if the filler neck auxiliary body a-2 separately formed together with the filler neck part a-1 and the filler tube body part a-3 is also configured using ferritic stainless steel with a low material cost, This leads to high product costs.
  • the filler tube A includes a filler neck A-1 and a filler tube main body a-3 that are integrally formed with each other, and a separate filler neck that is in a mutually fitted state.
  • the auxiliary body a-2 is used. Therefore, the filler tube has a double tube configuration, which increases the weight or cost of the automobile. This goes against the demand for lighter weight and lower cost required in recent automobiles.
  • the filler tube main body portion and the filler neck portion are integrated without adopting the conventional double tube method, and even if a ferritic stainless steel material having an advantageous material cost is used, the filler tube can be used. It is desired to suppress the rusting on the tube side and to surely prevent the occurrence of perforation corrosion at the filler neck. It is also desirable to provide a fuel tank filler tube that can reduce the number of assembly steps associated with a reduction in the number of parts and contribute to a reduction in the weight and cost of an automobile.
  • the filler tube main body portion whose one end side is connected to the fuel tank side, and the tip end portion which is integrally formed on the other end side of the filler tube main body portion serve as a fuel filler port portion.
  • a filler tube may be comprised by the filler neck part made.
  • the filler neck may be fitted to the other end of a filler cap protector whose one end is attached to the vehicle body panel.
  • the filler neck portion may be attached to the filler cap protector by welding a fitting portion between the filler cap protector and the filler neck portion.
  • both the filler tube and the filler cap protector may be made of a ferritic stainless steel material.
  • the filler cap protector may be configured to have a low potential with respect to the potential of the filler tube.
  • the filler cap protector may be configured to have a low potential with respect to the filler tube. Due to such a potential difference, potential difference corrosion due to a potential difference between the filler tube and the filler tube is preferentially generated on the filler cap protector side before the oxygen concentration cell is formed in the gap portion or welded portion between the filler tube and the filler cap protector. . As a result, the filler cap protector side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. This ensures the prevention of perforation corrosion at the filler neck and ensures that the fuel tank is airtight, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
  • the filler tube can be simplified in a configuration in which the filler tube main body portion and the filler neck portion are only integrated without adopting the conventional double tube method. it can.
  • the number of parts can be reduced and the assembly man-hours can be reduced, contributing to weight reduction and cost reduction of automobiles.
  • Both the filler tube and filler cap protector are made of ferritic stainless steel. Since it comprises, an advantage can be exhibited also in material cost.
  • the filler tube is, in mass%, C: ⁇ 0.010%, Si: ⁇ 1.00%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Cr: 17.00-18.00%, Ti: 10 (C + N) -0.35%, N: ⁇ 0.015%, the balance being inevitable impurities and Fe ferritic stainless steel (hereinafter referred to as “SUS439”) ) May be used.
  • the filler tube is, in mass%, C: ⁇ 0.010%, Si: ⁇ 0.14%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Cr: 17.00 to 18.00%, Mo: Ferritic stainless steel material (hereinafter referred to as “SUS436 material”) containing 1.00-1.50%, Ti: 10 (C + N) -0.35%, N: ⁇ 0.015%, the balance being inevitable impurities and Fe ) May be used.
  • SUS436 material Ferritic stainless steel material
  • the filler cap protector comprises, in% by mass, C: ⁇ 0.030%, Si: ⁇ 1.00%, Mn: ⁇ 1.00%, P: ⁇ 0.04%, S: ⁇ 0.030%, Cr: 10.50 to 11.45%, Ti : Ferrite stainless steel material (hereinafter sometimes referred to as “SUS409 material”) consisting of 10 (C + N) to 0.75%, N: ⁇ 0.015, the balance being inevitable impurities and Fe You can do it.
  • SUS409 material Ferrite stainless steel material
  • a ferrite-based SUS439 material or SUS436 material may be used for the filler tube.
  • a ferrite-based SUS409 material may be used for the filler cap protector. Therefore, the filler cap protector has a low potential with respect to the filler tube.
  • the filler cap protector side exhibits a sacrificial anticorrosive effect, and rusting of the rusting on the filler tube side can be suppressed.
  • it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
  • the filler neck portion and the filler cap protector according to the present invention may be fitted by interposing an aluminum plating layer.
  • an aluminum plating layer may be interposed in the fitting portion between the filler neck portion and the filler cap protector.
  • a potential difference is generated between the aluminum plating layer and the filler neck portion and filler cap protector in the fitting portion. Therefore, first, the aluminum plating layer is corroded by the potential difference.
  • the filler cap protector exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
  • the filler tube is, in mass%, C: ⁇ 0.010%, Si: ⁇ 0.14%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Ferritic stainless steel (SUS 436 material) containing Cr: 17.00-18.00%, Mo: 1.00-1.50%, Ti: 10 (C + N) -0.35%, N: ⁇ 0.015%, the balance consisting of inevitable impurities and Fe May be used to configure.
  • the filler cap protector is, in mass%, C: ⁇ 0.030%, Si: ⁇ 1.00%, Mn: ⁇ 1.00%, P: ⁇ 0.040%, S: ⁇ 0.030%, Cr: 10.50 to 11.45%, Ti : Ferrite stainless steel material (hereinafter referred to as “SUS409AL material”) containing 10 (C + N) to 0.75%, N: ⁇ 0.015, the balance being made of inevitable impurities and Fe, and having the aluminum plating layer formed on the surface thereof May be used).
  • SUS409AL material Ferrite stainless steel material
  • an aluminum plating layer is formed and interposed between the filler neck portion and the filler cap protector by a ferritic stainless steel material made of SUS409AL material on the filler cap protector side. It may be. Due to the presence of the aluminum plating layer, a potential difference is generated between the filler tube and the filler cap protector. Thereby, first, the low-potential aluminum plating layer is corroded by the potential difference. As a result, the filler cap protector side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
  • the filler tube is, in mass%, C: ⁇ 0.010%, Si: ⁇ 0.14%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Ferritic stainless steel (SUS 436 material) containing Cr: 17.00-18.00%, Mo: 1.00-1.50%, Ti: 10 (C + N) -0.35%, N: ⁇ 0.015%, the balance consisting of inevitable impurities and Fe May be used to configure.
  • the filler cap protector is made of C: ⁇ 0.010%, Si: ⁇ 1.00%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Cr: 17.00 to 18.00%, Ti: 10 (C + N ) -0.35%, N: ⁇ 0.015%, the remainder is composed of inevitable impurities and Fe, and the surface is formed by using a ferritic stainless steel material (SUS439AL material) on which the aluminum plating layer is formed. Good.
  • an aluminum plating layer may be formed and interposed between the filler neck portion and the filler cap protector with the SUS439AL material on the filler cap protector side. Due to the presence of the aluminum plating layer, a potential difference exists between the filler tube and the filler cap protector. Thereby, first, the low-potential aluminum plating layer is corroded by the potential difference. As a result, such an aluminum plating layer exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
  • the filler tube is made of C: ⁇ 0.010%, Si: ⁇ 1.00%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Cr: 17.00 ⁇
  • a ferritic stainless steel material (SUS439 material) containing 18.00%, Ti: 10 (C + N) to 0.35%, N: ⁇ 0.015%, the balance being inevitable impurities and Fe may be used.
  • the filler cap protector comprises, in% by mass, C: ⁇ 0.030%, Si: ⁇ 1.00%, Mn: ⁇ 1.00%, P: ⁇ 0.04%, S: ⁇ 0.030%, Cr: 10.50 to 11.45%, Ti : Consists of using ferritic stainless steel material (SUS409AL material) containing 10 (C + N) to 0.75%, N: ⁇ 0.015, the balance consisting of inevitable impurities and Fe, and having the aluminum plating layer formed on the surface You can do it.
  • an aluminum plating layer may be formed and interposed between the filler neck portion and the filler cap protector using the SUS409AL material on the filler cap protector side.
  • the presence of such an aluminum plating layer causes a potential difference between the filler tube and the filler cap protector.
  • an aluminum plating layer having a low potential causes potential difference corrosion.
  • such an aluminum plating layer exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side.
  • the SUS409 material which is the base material in the SUS409AL material is used for the filler tube constituted by the SUS439 material.
  • the potential of the constructed filler cap protector is low. Therefore, before the oxygen concentration cell is formed in the gap or welded portion between the filler tube and the filler cap protector, potential corrosion due to the potential difference with the filler tube is preferentially generated on the filler cap protector side.
  • the filler cap protector side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side.
  • the filler tube is, in mass%, C: ⁇ 0.010%, Si: ⁇ 1.00%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Cr : Ferritic stainless steel material (SUS439 material) containing 17.00 to 18.00%, Ti: 10 (C + N) to 0.35%, N: ⁇ 0.015, the balance being inevitable impurities and Fe.
  • the filler cap protector comprises, in% by mass, C: ⁇ 0.010%, Si: ⁇ 1.00%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Cr: 17.00 to 18.00%, Ti : Consists of using ferritic stainless steel material (SUS439AL material) containing 10 (C + N) to 0.35%, N: ⁇ 0.015, the balance consisting of inevitable impurities and Fe, and having the aluminum plating layer formed on the surface You can do it.
  • an aluminum plating layer may be formed and interposed between the filler neck portion and the filler cap protector using the SUS439AL material on the filler cap protector side. Due to the presence of the aluminum plating layer, a potential difference is generated between the filler tube and the filler cap protector, and potential difference corrosion occurs in the aluminum plating layer having a low potential. As a result, such an aluminum plating layer exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
  • the filler tube is, in mass%, C: ⁇ 0.010%, Si: ⁇ 0.14%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Uses stainless steel (SUS 436) containing Cr: 17.00-18.00%, Mo: 1.00-1.50%, Ti: 10 (C + N) -0.35%, N: ⁇ 0.015%, the balance being inevitable impurities and Fe And may be configured.
  • the filler cap protector is, in mass%, C: ⁇ 0.010%, Si: ⁇ 0.14%, Mn: ⁇ 0.20%, P: ⁇ 0.040%, S: ⁇ 0.006%, Cr: 17.00 to 18.00%, Mo : Ferritic stainless steel (SUS436AL material containing 1.00 to 1.50%, Ti: 10 (C + N) to 0.35%, N: ⁇ 0.015%, the balance being inevitable impurities and Fe, and forming an aluminum plating layer on the surface ) May be used.
  • an aluminum plating layer may be formed and interposed between the filler neck portion and the filler cap protector using the SUS436AL material on the filler cap protector side. Due to the presence of the aluminum plating layer, a potential difference is generated between the filler tube and the filler cap protector, and the aluminum plating layer having a low potential causes potential difference corrosion. As a result, such an aluminum plating layer exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
  • the filler cap protector is configured to have a low potential with respect to the filler tube. Due to such a potential difference, potential difference corrosion due to the potential difference between the filler tube and the filler tube is preferentially generated on the filler cap protector side before the oxygen concentration cell is formed in the gap portion or welded portion between the filler tube and the filler cap protector. . As a result, the filler cap protector side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
  • the filler tube can be simplified in a configuration in which the filler tube main body portion and the filler neck portion are only integrated without adopting the conventional double tube method. it can. As a result, it is possible to reduce the number of assembly steps by reducing the number of parts, thereby contributing to weight reduction and cost reduction of the automobile.
  • both the filler tube and the filler cap protector are configured by using a ferritic stainless steel material, an advantage can be exhibited in material cost.
  • FIG. 1 is a perspective view schematically illustrating a fuel tank device of a general automobile.
  • FIG. 2 is a longitudinal sectional view illustrating a filler tube structure adopting the present invention in an enlarged manner and drawn in a dot-dash line circle in FIG. 1.
  • V average electric potential
  • the filler tube according to the embodiment of the present invention is configured by integrating a filler tube main body portion and a filler neck portion without adopting a conventional double tube method. Moreover, this filler tube suppresses rusting on the filler tube side even if a ferritic stainless steel material having an advantageous material cost is used, and consequently prevents the occurrence of perforation corrosion in the filler neck portion. At the same time, the assembly man-hour associated with the reduction in the number of parts can be reduced to contribute to the reduction in weight and cost of the automobile.
  • the fuel tank 1 stores gasoline fuel or light oil fuel as a power source of the engine.
  • the fuel tank 1 is constituted by joining one peripheral half of a tank half (for example, an upper tank) 1a and the other half tank (for example, a lower tank) 1b to each other.
  • the fuel tank 1 is provided with a filler tube 2 for supplying fuel serving as a power source of the automobile into the fuel tank 1.
  • the filler tube 2 includes a filler tube main body 3 having one end connected to the fuel tank 1 and a filler neck formed integrally with the other end of the filler tube main body 3 as shown in detail in FIG. Part 4.
  • the filler neck portion 4 includes a filler neck portion side fitting portion 4a formed on the straight tube while gradually increasing the diameter with respect to the filler tube main body portion 3 formed on the substantially straight tube, and a filler neck portion side fitting.
  • the front end portion of the joint portion 4a is composed of an oil filler port portion 4b formed in a substantially trumpet shape.
  • the filler cap protector side fitting part 5a is fitted to the outer peripheral side of the filler neck part side fitting part 4a of the filler neck part 4.
  • the filler cap protector side fitting portion 5 a is the other end side of the filler cap protector 5 attached to the vehicle body panel 7 with one end side interposed with the grommet 6.
  • the filler cap protector side fitting part 5a and the filler neck part side fitting part 4a constitute the fitting part 8 by welding by spot welding or the like.
  • the filler opening 4b of the filler neck 4 is configured to be closed by a filler cap (not shown). Accordingly, the filler cap is surrounded by the filler cap protector 5 together with the filler neck portion 4 so as not to be damaged when the automobile encounters a collision accident or the like.
  • the filler tube 2 or the filler cap protector 5 is comprised using the ferritic stainless steel materials which mainly consist of the material c from the material a shown in FIG. The specific use of any of these ferritic steel materials for the filler tube 2 or the filler cap protector 5 will be described later).
  • material a corresponds to JIS standard SUS409 steel material. As shown in FIG. 3, the material a is a ferritic stainless steel having a chemical composition containing the following mass% components.
  • the material b (SUS439 material) is a ferritic stainless steel having a chemical composition containing the following mass% components.
  • the material c (SUS 436 material) is a ferritic stainless steel having a chemical composition containing the following mass% components.
  • Examples 1 to 7 will be sequentially described as specific examples employing the present invention relating to a filler tube structure configured by selectively using ferritic stainless steel having such a chemical composition.
  • the filler tube 2 and the filler cap protector 5 in Examples 1 to 7 are each a ferritic stainless steel material made of SUS409 material, SUS439 material, or SUS436 material as shown in FIG.
  • the surface of the SUS439 material or SUS436 material has an aluminum plating layer (oxide film layer) plated with pure aluminum or a general aluminum alloy containing, for example, 8% silicon and the balance being pure aluminum. It is configured by selectively combining any one of SUS409AL material, SUS439AL material, or SUS436AL material.
  • ferritic stainless steel materials constituting the filler tube 2 and the filler cap protector 5 in Examples 1 to 7 each have an average potential (V) as shown in FIG.
  • Such an average potential (V) is a measurement condition in a so-called salt damage severe area in a measurement condition (CCT cycle test (corrosion promotion cycle test)) of immersion in a 50 g / L NaCl solution heated to a temperature of 35 ° C. for 4 hours. (Corresponding)) by measuring the corrosion potential of each ferritic stainless steel material (including aluminized steel material).
  • the CCT cycle test assumed atmospheric corrosive environment such as rain water or salt water in various usage environment areas in automobiles, and steel materials were repeatedly subjected to dry and wet depending on changes in climate or humidity, or rainy weather. This is done by measuring the degree of corrosion.
  • Example 1 Based on the measurement results of these corrosion potentials, first, in Example 1, the filler tube 2 is constituted by using “SUS436 material”. On the other hand, the filler cap protector 5 is configured using “SUS409 material”.
  • the “SUS436 material” has an average potential of “ ⁇ 0.08V”.
  • the “SUS409 material” has an average potential of “ ⁇ 0.10 V”.
  • the average potential of the filler tube 2 is “ ⁇ 0.08 V”
  • the average potential of the filler cap protector 5 is “ ⁇ 0.10 V”.
  • an oxygen concentration cell is formed in a gap portion or a welded portion between the filler neck side fitting portion 4a of the filler neck portion 4 in the filler tube 2 and the filler cap protector side fitting portion 5a of the filler cap protector 5.
  • potential difference corrosion due to a potential difference with the filler tube 2 is preferentially generated on the filler cap protector 5 side.
  • the filler cap protector 5 side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side.
  • the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
  • the filler tube 2 is configured by integrally forming the filler tube main body portion 3 and the filler neck portion 4.
  • the double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Thereby, the assembly man-hour can be reduced by reducing the number of parts, which contributes to weight reduction and cost reduction of the automobile.
  • both the filler tube 2 and the filler cap protector 5 are configured using a ferritic stainless steel material. Thereby, an advantage can be exhibited also in material cost.
  • Example 2 the filler tube 2 is configured using “SUS439 material”.
  • the filler cap protector 5 is configured using “SUS409 material”.
  • the average potential of “SUS439 material” is “ ⁇ 0.08 V”.
  • the average potential of “SUS409 material” is “ ⁇ 0.10 V”.
  • the average potential of the filler tube 2 is “ ⁇ 0.08 V”
  • the average potential of the filler cap protector 5 is “ ⁇ 0.10 V”.
  • an oxygen concentration cell is formed in a gap portion or a welded portion between the filler neck side fitting portion 4a of the filler neck portion 4 in the filler tube 2 and the filler cap protector side fitting portion 5a of the filler cap protector 5.
  • potential difference corrosion due to a potential difference with the filler tube 2 is preferentially generated on the filler cap protector 5 side.
  • the filler cap protector 5 side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side.
  • the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
  • the filler tube 2 is configured by integrally forming the filler tube main body portion 3 and the filler neck portion 4.
  • the double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Therefore, the number of parts can be reduced by reducing the number of parts, which contributes to the weight reduction and cost reduction of the automobile.
  • Example 2 the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage can be exhibited also in material cost.
  • Example 3 the filler tube 2 is configured using “SUS436 material”.
  • the filler cap protector 5 is configured using “SUS409AL material” which is a stainless steel material subjected to aluminum plating.
  • an aluminum plating layer 9 is formed between the filler neck portion side fitting portion 4a and the filler cap protector side fitting portion 5a as shown in FIG.
  • the average potential of the stainless steel material made of “SUS436 material” is “ ⁇ 0.08 V”.
  • the average potential of the stainless steel material made of “SUS409 material” is “ ⁇ 0.10 V”.
  • the average potential of the ferritic stainless steel material made of “SUS439AL material” is “ ⁇ 0.70” because the aluminum plating layer 9 is formed on the surface thereof.
  • Example 3 an aluminum plating layer 9 made of a ferritic stainless steel material made of “SUS409AL material” on the filler cap protector 5 side is formed between the filler neck portion 4 and the filler cap protector 5. , Will intervene.
  • the presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5.
  • the aluminum plating layer 9 having a low potential causes potential difference corrosion preferentially.
  • the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side.
  • the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
  • Example 3 even if the aluminum plating layer 9 is completely corroded by the progress of the potentiometric corrosion, the base in the “SUS409AL material” is compared with the filler tube 2 made of the stainless steel material made of “SUS436 material”.
  • the potential of the filler cap protector 5 made of a stainless steel material made of “SUS409 material” as a material is low. Thereby, before the oxygen concentration cell is formed in the gap or welded portion between the filler tube 2 and the filler cap protector 5, the filler cap protector 5 side preferentially generates potential difference corrosion due to the potential difference with the filler tube 2. It will be.
  • the filler cap protector 5 side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side.
  • the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
  • the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. ,Constitute.
  • the double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Therefore, it is possible to reduce the assembly man-hours associated with the reduction in the number of parts, thereby contributing to the weight reduction and cost reduction of the automobile.
  • Example 3 the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage can be exhibited also in material cost.
  • Example 4 the filler tube 2 is configured using “SUS436 material”.
  • the filler cap protector 5 is configured using “SUS439AL material” plated with aluminum.
  • an aluminum plating layer 9 is formed between the filler neck portion side fitting portion 4a and the filler cap protector side fitting portion 5a as shown in FIG.
  • the average potential of the stainless steel material made of “SUS436 material” is “ ⁇ 0.08 V”.
  • the average potential of the stainless steel material made of “SUS439AL material” is “ ⁇ 0.70 V” because the aluminum plating layer 9 is formed on the surface thereof.
  • Example 4 the aluminum plating layer 9 made of a stainless steel material made of SUS409AL material on the filler cap protector 5 side is formed and interposed between the filler neck portion 4 and the filler cap protector 5. become.
  • the presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5.
  • the aluminum plating layer 9 having a low potential causes corrosion due to potential difference corrosion.
  • the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side.
  • the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
  • the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. It is comprised by.
  • the double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Therefore, it is possible to reduce the assembly man-hours associated with the reduction in the number of parts, thereby contributing to the weight reduction and cost reduction of the automobile.
  • Example 4 the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage is also exhibited in the material cost.
  • Example 5 the filler tube 2 is configured using “SUS439 material”.
  • the filler cap protector 5 is configured by using “SUS409AL material” which is an aluminum-plated stainless steel material.
  • the average potential of the ferritic stainless steel material made of “SUS439 material” is “ ⁇ 0.08 V”.
  • the average potential of the ferritic stainless steel material made of “SUS409 material” is “ ⁇ 0.10 V”.
  • the average potential of the stainless steel material made of “SUS409AL material” is “ ⁇ 0.70 V” because the aluminum plating layer 9 is formed on the surface thereof.
  • an aluminum plating layer 9 made of a stainless steel material made of “SUS409AL material” on the filler cap protector 5 side is formed between the filler neck portion 4 and the filler cap protector 5 and is interposed. Will do.
  • the presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5.
  • potential difference corrosion preferentially occurs on the side of the aluminum plating layer 9 having a low potential.
  • the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and can suppress rusting on the filler tube 2 side.
  • the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
  • Example 5 even if the aluminum plating layer 9 is completely corroded by the progress of the potential difference corrosion, the “SUS409AL material” is used for the filler tube 2 made of the ferritic stainless steel material made of “SUS439 material”. Since the potential of the filler cap protector 5 made of a ferritic stainless steel material made of “SUS409 material” which is the base material in FIG. 3 is low, an oxygen concentration cell is formed in the gap or welded portion between the filler tube 2 and the filler cap protector 5. Before being formed, the filler cap protector 5 side preferentially generates potential difference corrosion due to a potential difference with the filler tube 2.
  • the filler cap protector 5 side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side.
  • the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
  • the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. It is comprised by.
  • the double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Thereby, the assembly man-hour accompanying reduction of a number of parts can be reduced, and it can contribute to the weight reduction and cost reduction of a motor vehicle.
  • Example 5 the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, it can be said that it is advantageous also in material cost.
  • Example 6 the filler tube 2 is configured using “SUS439 material”.
  • the filler cap protector 5 is configured using “SUS439AL material” plated with aluminum.
  • an aluminum plating layer 9 is formed between the filler neck portion side fitting portion 4a and the filler cap protector side fitting portion 5a as shown in FIG.
  • the average potential of the ferritic stainless steel material made of “SUS439 material” is “ ⁇ 0.08 V”.
  • the average potential of the ferritic stainless steel material made of “SUS439AL material” is “ ⁇ 0.70 V” because the aluminum plating layer 9 is formed on the surface thereof.
  • Example 6 an aluminum plating layer 9 made of a ferritic stainless steel material made of SUS439AL material on the filler cap protector 5 side is formed between the filler neck portion 4 and the filler cap protector 5, and is interposed. Will do.
  • the presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5.
  • potential difference corrosion is preferentially caused on the side of the aluminum plating layer 9 having a low potential.
  • the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and can suppress rusting on the filler tube 2 side.
  • the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
  • the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. It is comprised by.
  • the double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Therefore, it is possible to reduce the assembly man-hours associated with the reduction in the number of parts, thereby contributing to the weight reduction and cost reduction of the automobile.
  • Example 6 the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage is also exhibited in the material cost.
  • Example 7 the filler tube 2 is configured using “SUS436 material”.
  • the filler cap protector 5 is configured using “SUS436AL material” plated with aluminum.
  • an aluminum plating layer 9 is formed between the filler neck portion side fitting portion 4a and the filler cap protector side fitting portion 5a as shown in FIG.
  • the average potential of the ferritic stainless steel material made of “SUS436 material” is “ ⁇ 0.08 V”.
  • the average potential of the ferritic stainless steel material made of “SUS436AL material” is “ ⁇ 0.70 V” because the aluminum plating layer 9 is formed on the surface thereof.
  • Example 7 the aluminum plating layer 9 made of a ferritic stainless steel material made of “SUS409AL material” on the filler cap protector 5 side is formed between the filler neck portion 4 and the filler cap protector 5. , Will intervene.
  • the presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5.
  • potential difference corrosion preferentially occurs on the side of the aluminum plating layer 9 having a low potential.
  • the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and can suppress rusting on the filler tube 2 side.
  • the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
  • the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. It is comprised by.
  • the double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. As a result, the assembly man-hours associated with the reduction in the number of parts can be reduced, which can contribute to weight reduction and cost reduction of the automobile.
  • Example 7 the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage is also exhibited in the material cost.
  • the inventors of the present invention have confirmed the function of preventing perforation corrosion of the filler tube 2 in Examples 1 to 7 according to the present invention described above.
  • the inventors of the present application assumed that automobiles are exposed to atmospheric corrosive environments such as rain water or salt water in various use environment areas. Under such assumption, in order to measure the degree of corrosion caused by repeated drying and wetting of steel materials, the inventors of the present application are very harsh from salt damage caused by seawater from so-called general areas where salt damage is relatively low due to seawater. We assumed even the so-called salt damage severe area as an environmental area. Under such assumptions, the inventors of the present application conducted the CCT cycle test and experimented on the potentiometric corrosion effect by the oxygen-resistant concentration cell.
  • Such a CCT cycle test was performed by repeating salt spraying, drying, wetting, and introduction of outside air as a cycle for steel materials a predetermined number of times. As the degree of corrosion promotion obtained as a result, the thickness remaining ratio (%) with respect to the initial thickness of the filler tube 2 was measured.
  • the test results shown in FIG. 7 were obtained by the CCT cycle test performed under such conditions.
  • the horizontal axis represents the number of cycles set on the assumption of “a so-called salt damage area as an environmental area where salt damage due to sea water etc. is extremely severe” from “a so-called general area where salt damage due to sea water is relatively small”. Is shown.
  • the vertical axis represents the sheet thickness remaining rate as the degree of corrosion of the filler tube 2 with respect to each material constituting the filler tube 2 and the filler cap protector 5.
  • the plate thickness remaining rate of the filler tube 2 is 160 cycles, which is the number of intermediate cycles. 80%.
  • the residual thickness ratio of the filler tube 2 is 40%, but the perforation corrosion has not yet occurred.
  • the filler tube 2 is made of “SUS439 material” as in the second embodiment.
  • the filler cap protector 5 is made of “SUS409 material”.
  • the plate thickness remaining rate of the filler tube 2 is 100% at 160 cycles which is the number of intermediate cycles. Even when the number of cycles corresponding to a so-called salt damage area reaches 300 cycles, the plate thickness remaining rate of the filler tube 2 is 80%.
  • the filler tube 2 is made of “SUS439 material”.
  • the filler cap protector 5 is made of “SUS409AL material”. In this case, the plate thickness remaining rate of the filler tube 2 is 100% in the total number of cycles.
  • the filler cap protector 5 is equivalent to the case of the above-described embodiment 2 constituted by the “SUS409 material”. Therefore, even if it is very small, the potential is low with respect to the filler tube 2 made of “SUS439 material”. Thereby, the sacrificial anticorrosion effect can be exhibited and the function of preventing perforation corrosion on the filler tube 2 side can be achieved.
  • the filler cap protector 5 made of “SUS409 material” may have a small potential difference with respect to the filler tube 2 made of “SUS436 material” in the first embodiment. Thereby, it is considered that the sacrificial anticorrosive effect can be exhibited and the function of preventing perforation corrosion on the filler tube 2 side can be achieved.
  • the filler cap protector 5 has a sacrificial anticorrosion effect because the potential is low. And the function of preventing the opening of the filler tube 2 can be achieved. Even if the aluminum plating layer 9 of the filler cap protector 5 is completely corroded, the filler cap protector 5 is equivalent to the case where the base material is made of “SUS409 material”. The potential is lower with respect to the filler tube 2 configured. Therefore, it is considered that the sacrificial anticorrosive effect can be exhibited and the function of preventing perforation corrosion on the filler tube 2 side can be achieved.
  • the filler tube 2 is composed of “SUS436 material” as in Example 4 and the filler cap protector 5 is composed of “SUS439AL material”, the filler tube 2 is composed of “SUS439 material” as in Example 6.
  • the filler cap protector 5 is composed of “SUS439AL material”, or when the filler tube 2 is composed of “SUS436 material” and the filler cap protector 5 is composed of “SUS436AL material” as in the seventh embodiment.
  • the filler tube is configured by integrally forming the filler tube main body portion and the filler neck portion without adopting the conventional double tube method. Even if a ferritic stainless steel material having an advantageous material cost is used as the filler tube, rusting on the filler tube side can be suppressed. As a result, the occurrence of perforation corrosion at the filler neck can be reliably prevented. Further, it is possible to reduce the assembly man-hours associated with the reduction in the number of parts, thereby contributing to weight reduction and cost reduction of the automobile. Therefore, it is suitable for a filler tube structure for supplying fuel into a fuel tank for storing gasoline fuel or light oil fuel as a power source of an engine such as an automobile.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)

Abstract

The present invention contributes to reducing the cost and weight of an automobile and, even when a ferritic stainless steel material is used for both a filler tube main body and a filler cap protector, suppresses rusting on the filler tube main body side, which reliably prevents perforation corrosion at a filler neck part. According to the present invention, a filler tube 2 that constitutes a filler tube 2 is configured using a ferritic stainless steel material. A filler cap protector 5 is configured using a ferritic stainless steel material that, relative to the ferritic stainless steel material that constitutes the filler tube 2, reduces the electric potential inside and outside a weld gap that is formed between a filler-neck-part-side fitting part 4a and a filler-cap-protector-side fitting part 5a.

Description

フィラーチューブ構造Filler tube structure
　この発明は、自動車などのエンジンの動力源としてのガソリン燃料或いは軽油燃料を貯蔵する燃料タンク内に燃料を給油するフィラーチューブ構造に関する。 The present invention relates to a filler tube structure for supplying fuel into a fuel tank for storing gasoline fuel or light oil fuel as a power source of an engine such as an automobile.
　従来におけるこの種のフィラーチューブ構造は、例えば、一端側が燃料タンク側に接続されるフィラーチューブ本体部と、フィラーチューブ本体部の他端側に一体形成されて給油口部として構成されるフィラーネック部とで、フィラーチューブを構成している。フィラーネック部は、一端側が車体パネルに取り付けられるフィラーキャッププロテクターの他端側に嵌合されている。フィラーネック部は、フィラーキャッププロテクターとフィラーネック部との嵌合部が溶着されることによりフィラーキャッププロテクターに取り付けられている。 This type of filler tube structure in the prior art includes, for example, a filler tube main body portion whose one end is connected to the fuel tank side, and a filler neck portion integrally formed on the other end side of the filler tube main body portion and configured as a fuel filler port portion. And the filler tube is comprised. One end side of the filler neck portion is fitted to the other end side of the filler cap protector attached to the vehicle body panel. The filler neck part is attached to the filler cap protector by welding a fitting part between the filler cap protector and the filler neck part.
　かかる従来のフィラーチューブ構造においては、フィラーチューブを構成するフィラーチューブ本体部は、長手方向ほぼ直状管形状の部分を主体として構成されている。一方、同じくフィラーチューブを構成するフィラーネック部は、先端に向かってラッパ状に拡径形成することによって構成されている。 In such a conventional filler tube structure, the filler tube main body constituting the filler tube is mainly composed of a substantially straight tube-shaped portion in the longitudinal direction. On the other hand, the filler neck part which comprises a filler tube similarly is comprised by expanding and forming in a trumpet shape toward the front-end | tip.
　そして、この種の従来のフィラーチューブの一例として、構造を簡単にして軽量化などすべく、フィラーチューブ本体部とフィラーネック部とを樹脂、アルミニウム（以下、「アルミ」と略称する）、またはステンレス鋼材を用いて一体成形することにより構成するものが多く用いられている（関連する技術を開示したものとして、特許文献１及び特許文献４の記載を参照）。 As an example of this type of conventional filler tube, in order to simplify the structure and reduce the weight, the filler tube main body portion and the filler neck portion are made of resin, aluminum (hereinafter abbreviated as “aluminum”), or stainless steel. Many are configured by integrally forming a steel material (see the description of Patent Document 1 and Patent Document 4 as disclosing related techniques).
　しかしながら、特許文献１に記載の樹脂の一体成形品で構成されるフィラーチューブ、または特許文献２に記載のアルミの一体成形品で構成されるフィラーチューブは、燃料タンクと共に車体にも設置されている。したがって、自動車が衝突事故などに遭遇した場合、燃料タンクの気密性機能を発揮するための強度剛性の点で、難点を示す場合がある。そこで、従来では、高強度剛性が発揮できるように、特許文献３、または特許文献４に記載されたようなステンレス鋼材製のフィラーチューブが広く使用されている。なぜなら、ステンレス鋼材製のフィラーチューブは、高強度剛性であると共に自動車の走行中に飛散される泥水または海岸近くの走行中などの塩害環境下における高耐食性、並びに長期間の気密性保持に優れていることからである。 However, the filler tube composed of the resin integrally molded product described in Patent Document 1 or the filler tube composed of the aluminum integrally molded product described in Patent Document 2 is installed in the vehicle body together with the fuel tank. . Therefore, when an automobile encounters a collision accident or the like, it may present a difficulty in terms of strength and rigidity for exerting the airtight function of the fuel tank. Therefore, conventionally, a filler tube made of a stainless steel material as described in Patent Document 3 or Patent Document 4 is widely used so as to exhibit high strength rigidity. Because the stainless steel filler tube has high strength and rigidity, it is excellent in high corrosion resistance in salty environments such as muddy water splashed during driving of a car or driving near the coast, and long-term airtightness maintenance. Because it is.
　そして、ステンレス鋼材製のフィラーチューブ本体部及びフィラーネック部を一体的に構成する一体型のフィラーチューブは、フィラーキャッププロテクターを介在させ、ゴム等の弾性体で形成されたグロメットを介して車体に装着されるように構成されている。そして、フィラーキャッププロテクター及びフィラーチューブは、共に、自動車の走行中に飛散される泥水または海岸近くの走行中などの塩害環境下における高耐食性、或いは長期間の気密性保持などを達成すると同時に、材料コストの有利性の観点から、ステンレス鋼材を用いて構成されている。 The integral filler tube that integrally forms the filler tube body and filler neck made of stainless steel is attached to the vehicle body via a grommet made of rubber or other elastic material with a filler cap protector interposed. It is configured to be. Both the filler cap protector and filler tube achieve high corrosion resistance in a salt damage environment such as muddy water scattered during driving of a car or driving near the coast, or maintaining airtightness for a long period of time. From the viewpoint of cost advantage, the stainless steel material is used.
　ところで、このように一体型のフィラーチューブにおけるフィラーネック部とフィラーキャッププロテクターとは、両者を互いに嵌合させた状態で、例えばスポット溶接などにより溶着することにより、互いに組み付け構成されている。 By the way, the filler neck part and the filler cap protector in the integral filler tube are assembled to each other by being welded, for example, by spot welding or the like in a state where both are fitted to each other.
　これにより、たとえフィラーネック部とフィラーキャッププロテクターとの嵌合部が、スポット溶接などにより溶着されていたとしても、僅少の溶接隙間が形成されてしまう。その結果、自動車走行中などに飛散した泥水または海水などが当該僅少の溶接隙間の開口端から奥まった部位に侵入してしまいがちである。そして、溶接隙間における奥まった部位に侵入した泥水または海水などは、塩素などを含むことから、溶接隙間内の酸素と結合して化学反応を起こして、溶接隙間内の酸素を消費してしまうことになる。かかる酸素の消費により、溶接隙間における奥まった部位では、当該開口端に対して、酸素濃度に差異が生じて、塩素イオンなどを含む酸素濃淡電池が形成されてしまう。 Therefore, even if the fitting portion between the filler neck portion and the filler cap protector is welded by spot welding or the like, a slight welding gap is formed. As a result, muddy water, seawater, or the like scattered while the vehicle is running or the like tends to enter a portion that is deep from the opening end of the small welding gap. And since muddy water or seawater that has penetrated into the deep part of the welding gap contains chlorine, etc., it combines with oxygen in the welding gap to cause a chemical reaction and consume oxygen in the welding gap. become. Due to the consumption of oxygen, a difference occurs in the oxygen concentration at the open end in the welding gap, and an oxygen concentration cell containing chlorine ions or the like is formed.
　このように塩素イオンなどを含む酸素濃淡電池が形成された溶接隙間は、いずれも電位が同位のステンレス鋼材から成るフィラーネック部とフィラーキャッププロテクターとが互いに重なり合って形成されたものである。この結果、当該溶接隙間において、酸素濃淡電池による隙間腐食が生起して、フィラーネック部及びフィラーキャッププロテクターを構成するステンレス鋼材の表面に形成された酸化被膜が、酸素濃淡電池を構成する塩素イオンなどにより破壊されてしまう。かかることから、溶接隙間を構成するフィラーネック部及びフィラーキャッププロテクターの耐食性は、所謂酸素濃淡電池による隙間腐食に起因して、劣化する。かかる酸素濃淡電池による隙間腐食が進行すると、孔開き腐食にまで発展してしまう可能性がある。 The weld gap in which the oxygen concentration cell containing chlorine ions and the like is thus formed is formed by overlapping the filler neck portion and the filler cap protector made of a stainless steel material having the same potential. As a result, in the weld gap, crevice corrosion due to the oxygen concentration cell occurs, and the oxide film formed on the surface of the stainless steel material constituting the filler neck portion and the filler cap protector is chloride ions constituting the oxygen concentration cell, etc. Will be destroyed. For this reason, the corrosion resistance of the filler neck portion and the filler cap protector constituting the weld gap deteriorates due to the crevice corrosion caused by the so-called oxygen concentration cell. When crevice corrosion by such an oxygen concentration cell proceeds, there is a possibility of developing to perforation corrosion.
　このような耐食性劣化により孔開き腐食がフィラーネック部側に発生してしまった場合には、燃料タンクの気密性が保持され得ない可能性が出てきてしまう。 When the perforation corrosion occurs on the filler neck side due to such corrosion resistance deterioration, there is a possibility that the airtightness of the fuel tank cannot be maintained.
　かかる酸素濃淡電池による隙間腐食による孔開き腐食の問題は、フィラーチューブ及びフィラーキャッププロテクターについて、耐隙間腐食性に優れたオーステナイト系ステンレス鋼を使用して構成することにより解決できる。 Such a problem of perforation corrosion due to crevice corrosion due to the oxygen concentration cell can be solved by configuring the filler tube and filler cap protector using austenitic stainless steel having excellent crevice corrosion resistance.
　しかし、オーステナイト系ステンレス鋼材により構成したフィラーチューブ及びフィラーキャッププロテクター同士を溶接した場合、当該溶接部の結晶粒界に応力腐食割れが生じてしまうと共に、材料コストが高くなってしまう、という新たな課題が生起する。 However, when welding filler tubes and filler cap protectors made of austenitic stainless steel materials, a new problem is that stress corrosion cracking occurs at the grain boundaries of the weld and the material cost increases. Will occur.
　かかることから、オーステナイト系ステンレス鋼材により構成したフィラーチューブ及びフィラーキャッププロテクター同士を溶接工法により溶着する方式は、高材料コストのことも加わって、実用的ではないといわざるを得ない。 Therefore, it can be said that the method of welding filler tubes and filler cap protectors made of austenitic stainless steel materials by a welding method is not practical due to the high material cost.
　そこで、従来における別の従来例として、図８に示すフィラーチューブ構造が提案されている。 Therefore, a filler tube structure shown in FIG. 8 has been proposed as another conventional example.
　図８によれば、この種の従来例に係るフィラーチューブ構造におけるフィラーチューブＡは、フェライト系ステンレス鋼材を使用して構成し、しかも、フィラーネック部ａ－１に別体製のフィラーネック補助体ａ－２を嵌合すると共に互いに加締め装着することにより構成される二重管方式が採用されており、フィラーネック部ａ－１と別体製のフィラーネック補助体ａ－２との嵌合隙間を閉塞すべく、シール材Ｂを嵌合し、弾性的に設けることにより気密構造にしている。 According to FIG. 8, the filler tube A in the filler tube structure according to the conventional example of this type is configured by using a ferritic stainless steel material, and the filler neck auxiliary body separately formed in the filler neck portion a-1. A double pipe method is adopted in which a-2 is fitted and swaged to each other, and the filler neck part a-1 is fitted to a separate filler neck auxiliary body a-2. In order to close the gap, the sealing material B is fitted and elastically provided to form an airtight structure.
　そして、図８に示す従来例においても、上記他の従来例と同様にやはり、フィラーネック部ａ－１は、車体パネルＣにグロメットＦを介して一端が装着されるフィラーキャッププロテクターＤの他端側に嵌合された状態で、フィラーネック部ａ－１とフィラーキャッププロテクターＤとの嵌合部Ｅを溶着することにより、フィラーキャッププロテクターＤに取り付けられている。 Also in the conventional example shown in FIG. 8, as in the other conventional examples, the filler neck portion a-1 is also connected to the other end of the filler cap protector D, one end of which is attached to the vehicle body panel C via the grommet F. In a state of being fitted to the side, the filler neck protector D is attached to the filler cap protector D by welding a fitting portion E between the filler neck portion a-1 and the filler cap protector D.
特開２０１５－５４４３１号公報JP2015-54431A 特開２００８－２７５１３号公報JP 2008-27513 A 特開２００３－２７６９５９号公報JP 2003-276959 A 特開２００９－２０８５１７号公報JP 2009-208517 A
解決しようとする課題Challenges to be solved
　このように構成する図８に示す従来例においては、フィラーネック部ａ－１とフィラーキャッププロテクターＤとは、互いに嵌合状態でスポット溶接等により溶着されていることから、当該嵌合部Ｅには当然ながら僅少の溶接隙間が形成されてしまうことになる。 In the conventional example shown in FIG. 8 configured as described above, the filler neck part a-1 and the filler cap protector D are welded to each other in a fitted state by spot welding or the like. As a matter of course, a small welding gap is formed.
　そして、フィラーネック部ａ－１とフィラーキャッププロテクターＤとは、高強度剛性を達成すると共に、自動車の走行中に飛散される泥水または海岸近くの走行中などの塩害環境下における高耐食性、或いは長期間の気密性保持などを達成し、且つ、材料コストの低減を図るべく、共に、同質のフェライト系ステンレス鋼材にて構成されている。 The filler neck portion a-1 and the filler cap protector D achieve high strength rigidity and high corrosion resistance in a salty environment such as muddy water scattered during driving of the automobile or driving near the coast, or long. In order to achieve the airtightness maintenance of the period and to reduce the material cost, both are made of the same ferritic stainless steel material.
　この結果、当該嵌合部Ｅにおいて、フィラーネック部ａ－１とフィラーキャッププロテクターＤとは、共に同質のフェライト系ステンレス鋼材により構成され、互いに同位の電位（Ｖ）を有していることになる。かかることから、溶接隙間より侵入した飛散泥水または海水などが混入して構成される溶液が、僅少の溶接隙間において酸素濃淡電池による隙間腐食を生起させ、部材表面の薄い酸化被膜を不安定にさせ、延いては、酸化被膜の破壊を起こしてしまう。かかる酸化被膜の破壊が進行すると、フィラーネック部ａ－１またはフィラーキャッププロテクターＤにおいて孔開き腐食を生起させてしまう可能性がある。 As a result, in the fitting portion E, the filler neck portion a-1 and the filler cap protector D are both made of the same ferritic stainless steel material and have the same potential (V). . For this reason, a solution composed of scattered muddy water or seawater that has entered through the welding gap causes crevice corrosion due to the oxygen concentration cell in a small welding gap and makes the thin oxide film on the surface of the member unstable. As a result, the oxide film is destroyed. When the destruction of the oxide film proceeds, there is a possibility that perforation corrosion occurs in the filler neck portion a-1 or the filler cap protector D.
　かかる点に鑑み、図８に示す従来例においては、フィラーネック部ａ－１と別体製のフィラーネック部補助体ａ－２との嵌合部に、シール材Ｂを加締め嵌合し、弾性的に設ける。かかるシール材Ｂは、フィラーネック部ａ－１と別体製のフィラーネック補助体ａ－２との嵌合部より上流側、即ち、不図示の燃料タンク側に配置されて、シール部を構成しているのである。 In view of this point, in the conventional example shown in FIG. 8, the sealing material B is caulked and fitted to the fitting portion between the filler neck portion a-1 and the filler neck portion auxiliary body a-2 made separately, Provide elastically. Such a sealing material B is arranged on the upstream side of the fitting portion between the filler neck portion a-1 and the filler neck auxiliary body a-2 made separately, that is, on the fuel tank side (not shown) to constitute the sealing portion. It is doing.
　これにより、フィラーネック部ａ－１とフィラーキャッププロテクターＤとの嵌合部Ｅにおいて、たとえ、孔開き腐食が発生したとしても、別体製のフィラーネック補助体ａ－２とフィラーチューブ本体部ａ－３との間は、シール材Ｂによって互いに気密保持されていることになる。この結果、フィラーネック部ａ－１の開口部が不図示のフィラーキャップによって閉塞されていることと相俟って、シール材Ｂは、フィラーチューブＡの気密性の保持機能を発揮して、不図示の燃料タンクの気密性を保持することになる。 As a result, even if perforation corrosion occurs in the fitting portion E between the filler neck portion a-1 and the filler cap protector D, the filler neck auxiliary body a-2 and the filler tube main body portion a, which are made separately, are generated. -3 is held airtight by the sealing material B. As a result, coupled with the fact that the opening of the filler neck portion a-1 is closed by a filler cap (not shown), the sealing material B exhibits the airtight holding function of the filler tube A, and is not suitable. The airtightness of the illustrated fuel tank is maintained.
　しかしながら、図８に示す従来例においては、フィラーチューブＡは、互いに一体構成されたフィラーネック部ａ－１及びフィラーチューブ本体部ａ－３に加えて、別体製のフィラーネック補助体ａ－２によって、二重管方式により構成されている。しかも、フィラーネック部ａ－１と別体製のフィラーネック補助体ａ－２との間にシール材Ｂを介在させて気密性を保持する構成を採っていることになる。かかることから、図８に示す従来例は、特許文献３或いは特許文献４に示すような別体製のフィラーネック補助体ａ－２を使用しない従来例に比して、部品点数の増加をもたらすと共に、組立作業工数が多大となる。よって、たとえ、フィラーネック部ａ－１及びフィラーチューブ本体部ａ－３と共に別体製のフィラーネック補助体ａ－２をも材料コストの安価なフェライト系ステンレス鋼を使用して構成したとしても、製品のコスト高を招いてしまうことになる。 However, in the conventional example shown in FIG. 8, the filler tube A includes a filler neck auxiliary body a-2 separately formed in addition to the filler neck part a-1 and the filler tube body part a-3 that are integrally formed with each other. Is constituted by a double tube system. In addition, the sealing material B is interposed between the filler neck portion a-1 and the separate filler neck auxiliary body a-2 to maintain the airtightness. Therefore, the conventional example shown in FIG. 8 brings about an increase in the number of parts as compared with the conventional example in which a separate filler neck auxiliary body a-2 as shown in Patent Document 3 or Patent Document 4 is not used. At the same time, the assembly man-hours become large. Therefore, even if the filler neck auxiliary body a-2 separately formed together with the filler neck part a-1 and the filler tube body part a-3 is also configured using ferritic stainless steel with a low material cost, This leads to high product costs.
　また、図８に示す従来例においては、フィラーチューブＡは、互いに一体構成のフィラーネック部ａ－１及びフィラーチューブ本体部ａ－３に加えて、互いに嵌合状態にした別体製のフィラーネック補助体ａ－２を使用して構成されている。したがって、フィラーチューブが二重管構成となって、自動車の高重量化或いは高コスト化を招いてしまう。これは、最近の自動車において求められているより軽量化およびより低コスト化要求に反することになる。 In the conventional example shown in FIG. 8, the filler tube A includes a filler neck A-1 and a filler tube main body a-3 that are integrally formed with each other, and a separate filler neck that is in a mutually fitted state. The auxiliary body a-2 is used. Therefore, the filler tube has a double tube configuration, which increases the weight or cost of the automobile. This goes against the demand for lighter weight and lower cost required in recent automobiles.
　そこで、フィラーチューブとして、従来のような二重管方式を採らずにフィラーチューブ本体部とフィラーネック部とを一体構成にし、且つ、材料コストの有利なフェライト系ステンレス鋼材を使用したとしても、フィラーチューブ側の発錆を抑止して、結果的にフィラーネック部における孔開き腐食の発生を確実に防止することが望まれている。また、部品点数の減数化に伴う組立工数を軽減させて、自動車の軽量化および低コスト化に寄与することができる燃料タンク用フィラーチューブを提供することが望まれている。 Therefore, as a filler tube, the filler tube main body portion and the filler neck portion are integrated without adopting the conventional double tube method, and even if a ferritic stainless steel material having an advantageous material cost is used, the filler tube can be used. It is desired to suppress the rusting on the tube side and to surely prevent the occurrence of perforation corrosion at the filler neck. It is also desirable to provide a fuel tank filler tube that can reduce the number of assembly steps associated with a reduction in the number of parts and contribute to a reduction in the weight and cost of an automobile.
一般的開示General disclosure
　この発明の一態様に係るフィラーチューブ構造によれば、一端側が燃料タンク側に接続されるフィラーチューブ本体部と、該フィラーチューブ本体部の他端側に一体形成され先端部が給油口部として構成されるフィラーネック部とにより、フィラーチューブが構成されてよい。前記フィラーネック部が、一端側が車体パネルに取着されるフィラーキャッププロテクターの他端側に嵌合されてよい。前記フィラーネック部は、前記フィラーキャッププロテクターと前記フィラーネック部との嵌合部を溶着することにより前記フィラーキャッププロテクターに取り付けられてよい。上記フィラーチューブ構造において、前記フィラーチューブ及び前記フィラーキャッププロテクターが共に、フェライト系ステンレス鋼材により構成されてよい。前記フィラーキャッププロテクターが、前記フィラーチューブの電位に対して、低い電位を有して構成されてよい。 According to the filler tube structure according to one aspect of the present invention, the filler tube main body portion whose one end side is connected to the fuel tank side, and the tip end portion which is integrally formed on the other end side of the filler tube main body portion serve as a fuel filler port portion. A filler tube may be comprised by the filler neck part made. The filler neck may be fitted to the other end of a filler cap protector whose one end is attached to the vehicle body panel. The filler neck portion may be attached to the filler cap protector by welding a fitting portion between the filler cap protector and the filler neck portion. In the filler tube structure, both the filler tube and the filler cap protector may be made of a ferritic stainless steel material. The filler cap protector may be configured to have a low potential with respect to the potential of the filler tube.
　かかる構成により、この発明の一態様によれば、フィラーチューブに対して、フィラーキャッププロテクターが、低い電位を有して構成されてよい。かかる電位差によって、フィラーチューブとフィラーキャッププロテクターとの隙間部または溶接部において、酸素濃淡電池が形成される前にフィラーキャッププロテクター側にフィラーチューブとの電位差による電位差腐食を優先的に発生させることになる。この結果、かかるフィラーキャッププロテクター側が犠牲防食効果を発揮して、フィラーチューブ側の発錆を抑止することになる。これにより、フィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 With this configuration, according to one aspect of the present invention, the filler cap protector may be configured to have a low potential with respect to the filler tube. Due to such a potential difference, potential difference corrosion due to a potential difference between the filler tube and the filler tube is preferentially generated on the filler cap protector side before the oxygen concentration cell is formed in the gap portion or welded portion between the filler tube and the filler cap protector. . As a result, the filler cap protector side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. This ensures the prevention of perforation corrosion at the filler neck and ensures that the fuel tank is airtight, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　また、この発明の一態様によれば、フィラーチューブとして、従来のような二重管方式を採らずにフィラーチューブ本体部とフィラーネック部とを一体構成のみとする構成の簡略化を図ることができる。これにより、部品点数の減数化による組立工数の軽減化を果たして、自動車の軽量化および低コスト化に寄与することができると共に、フィラーチューブ及びフィラーキャッププロテクターは、共にフェライト系ステンレス鋼材を使用して構成することから、材料コストにおいても有利性を発揮することができる。 Moreover, according to one aspect of the present invention, the filler tube can be simplified in a configuration in which the filler tube main body portion and the filler neck portion are only integrated without adopting the conventional double tube method. it can. As a result, the number of parts can be reduced and the assembly man-hours can be reduced, contributing to weight reduction and cost reduction of automobiles. Both the filler tube and filler cap protector are made of ferritic stainless steel. Since it comprises, an advantage can be exhibited also in material cost.
　この発明における実施形態によれば、前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材（以下、「SUS４３９材」と略称する場合がある）を使用して構成してよい。又は、前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材（以下、「SUS４３６材」と略称する場合がある）を使用して構成してよい。一方、前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.030％、Ｓｉ：≦1.00％、Ｍｎ：≦1.00％、Ｐ：≦0.04％、Ｓ：≦0.030％、Ｃｒ：10.50～11.45％、Ｔｉ：10（Ｃ＋Ｎ）～0.75％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材（以下、「SUS４０９材」と略称する場合がある）を使用して構成ししてよい。 According to an embodiment of the present invention, the filler tube is, in mass%, C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00-18.00%, Ti: 10 (C + N) -0.35%, N: ≦ 0.015%, the balance being inevitable impurities and Fe ferritic stainless steel (hereinafter referred to as “SUS439”) ) May be used. Alternatively, the filler tube is, in mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Mo: Ferritic stainless steel material (hereinafter referred to as “SUS436 material”) containing 1.00-1.50%, Ti: 10 (C + N) -0.35%, N: ≦ 0.015%, the balance being inevitable impurities and Fe ) May be used. On the other hand, the filler cap protector comprises, in% by mass, C: ≦ 0.030%, Si: ≦ 1.00%, Mn: ≦ 1.00%, P: ≦ 0.04%, S: ≦ 0.030%, Cr: 10.50 to 11.45%, Ti : Ferrite stainless steel material (hereinafter sometimes referred to as “SUS409 material”) consisting of 10 (C + N) to 0.75%, N: ≦ 0.015, the balance being inevitable impurities and Fe You can do it.
　このような構成により、この発明における実施形態によれば、フィラーチューブにはフェライト系のSUS４３９材又はSUS４３６材が使用されてよい。一方、フィラーキャッププロテクターにはフェライト系のSUS４０９材が使用されてよい。したがって、フィラーチューブに対して、フィラーキャッププロテクターが、低い電位を有して構成されていることになる。かかる電位差によって、フィラーチューブとフィラーキャッププロテクターとの隙間部または溶接部において、酸素濃淡電池が形成される前に、フィラーキャッププロテクター側にフィラーチューブとの電位差による電位差腐食を優先的に発生させることになる。この結果、かかるフィラーキャッププロテクター側が犠牲防食効果を発揮して、フィラーチューブ側の発錆の発錆を抑止することができる。結果的にフィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 With such a configuration, according to the embodiment of the present invention, a ferrite-based SUS439 material or SUS436 material may be used for the filler tube. On the other hand, a ferrite-based SUS409 material may be used for the filler cap protector. Therefore, the filler cap protector has a low potential with respect to the filler tube. By such a potential difference, before the oxygen concentration cell is formed in the gap portion or welded portion between the filler tube and the filler cap protector, the potential difference corrosion due to the potential difference between the filler tube and the filler tube is preferentially generated on the filler cap protector side. Become. As a result, the filler cap protector side exhibits a sacrificial anticorrosive effect, and rusting of the rusting on the filler tube side can be suppressed. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　また、この発明における実施形態によれば、上記発明における前記フィラーネック部及び前記フィラーキャッププロテクターが、アルミメッキ層を介在させることによって嵌合されてよい。 Further, according to the embodiment of the present invention, the filler neck portion and the filler cap protector according to the present invention may be fitted by interposing an aluminum plating layer.
　かかる構成により、この発明における実施形態によれば、フィラーネック部とフィラーキャッププロテクターとの間における嵌合部に、アルミメッキ層を介在させてよい。かかるアルミメッキ層と嵌合部におけるフィラーネック部及びフィラーキャッププロテクターとの間で電位差が生じている。よって、先ずアルミメッキ層が、電位差により腐食される。この結果、フィラーキャッププロテクターが犠牲防食効果を発揮して、フィラーチューブ側の発錆を抑止することになる。結果的にフィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 With this configuration, according to the embodiment of the present invention, an aluminum plating layer may be interposed in the fitting portion between the filler neck portion and the filler cap protector. A potential difference is generated between the aluminum plating layer and the filler neck portion and filler cap protector in the fitting portion. Therefore, first, the aluminum plating layer is corroded by the potential difference. As a result, the filler cap protector exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　また、この発明における実施形態によれば、前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材（SUS４３６材）を使用して構成してよい。一方、前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.030％、Ｓｉ：≦1.00％、Ｍｎ：≦1.00％、Ｐ：≦0.040％、Ｓ：≦0.030％、Ｃｒ：10.50～11.45％、Ｔｉ：10（Ｃ＋Ｎ）～0.75％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成り、且つ表面に前記アルミメッキ層を形成したフェライト系ステンレス鋼材（以下、「SUS４０９ＡＬ材」と略称する場合がある）を使用することにより構成してよい。 Further, according to the embodiment of the present invention, the filler tube is, in mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Ferritic stainless steel (SUS 436 material) containing Cr: 17.00-18.00%, Mo: 1.00-1.50%, Ti: 10 (C + N) -0.35%, N: ≤0.015%, the balance consisting of inevitable impurities and Fe May be used to configure. On the other hand, the filler cap protector is, in mass%, C: ≦ 0.030%, Si: ≦ 1.00%, Mn: ≦ 1.00%, P: ≦ 0.040%, S: ≦ 0.030%, Cr: 10.50 to 11.45%, Ti : Ferrite stainless steel material (hereinafter referred to as “SUS409AL material”) containing 10 (C + N) to 0.75%, N: ≦ 0.015, the balance being made of inevitable impurities and Fe, and having the aluminum plating layer formed on the surface thereof May be used).
　かかる構成により、この発明における実施形態によれば、フィラーネック部とフィラーキャッププロテクターとの間に、フィラーキャッププロテクター側のSUS４０９ＡＬ材からなるフェライト系ステンレス鋼材によってアルミメッキ層が形成され、介在することになってよい。かかるアルミメッキ層の存在により、フィラーチューブとフィラーキャッププロテクターとの間に電位差が生じることになる。これにより、先ず電位の低いアルミメッキ層が電位差により腐食されることになる。この結果、かかるフィラーキャッププロテクター側が犠牲防食効果を発揮して、フィラーチューブ側の発錆を抑止することになる。結果的にフィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 With such a configuration, according to the embodiment of the present invention, an aluminum plating layer is formed and interposed between the filler neck portion and the filler cap protector by a ferritic stainless steel material made of SUS409AL material on the filler cap protector side. It may be. Due to the presence of the aluminum plating layer, a potential difference is generated between the filler tube and the filler cap protector. Thereby, first, the low-potential aluminum plating layer is corroded by the potential difference. As a result, the filler cap protector side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　しかも、この発明における実施形態によれば、たとえアルミメッキ層が酸素濃淡電池による電位差腐食により腐食し切ったとしても、SUS４３６材により構成されるフィラーチューブに対して、SUS４０９ＡＬ材における基材であるSUS４０９材により構成されるフィラーキャッププロテクターの電位が低くなる。これにより、フィラーチューブとフィラーキャッププロテクターとの隙間部または溶接部において、酸素濃淡電池が形成される前に、フィラーキャッププロテクター側に、フィラーチューブとの電位差による電位差腐食を優先的に発生させて、フィラーチューブ側の発錆を抑止することができる。この結果、フィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 Moreover, according to the embodiment of the present invention, even if the aluminum plating layer is completely corroded by the potential difference corrosion by the oxygen concentration cell, SUS409, which is the base material in the SUS409AL material, with respect to the filler tube composed of the SUS436 material. The potential of the filler cap protector made of the material is lowered. Thereby, before the oxygen concentration cell is formed in the gap portion or welded portion between the filler tube and the filler cap protector, on the filler cap protector side, the potential difference corrosion due to the potential difference with the filler tube is preferentially generated, Rust generation on the filler tube side can be suppressed. As a result, it is possible to reliably prevent perforation corrosion at the filler neck and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　また、この発明における実施形態によれば、前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材（SUS４３６材）を使用して構成してよい。一方、前記フィラーキャッププロテクターを、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成り、且つ表面に前記アルミメッキ層を形成したフェライト系ステンレス鋼材（SUS４３９ＡＬ材）を使用することにより構成してよい。 Further, according to the embodiment of the present invention, the filler tube is, in mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Ferritic stainless steel (SUS 436 material) containing Cr: 17.00-18.00%, Mo: 1.00-1.50%, Ti: 10 (C + N) -0.35%, N: ≤0.015%, the balance consisting of inevitable impurities and Fe May be used to configure. On the other hand, the filler cap protector is made of C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Ti: 10 (C + N ) -0.35%, N: ≦ 0.015%, the remainder is composed of inevitable impurities and Fe, and the surface is formed by using a ferritic stainless steel material (SUS439AL material) on which the aluminum plating layer is formed. Good.
　かかる構成により、この発明における実施形態によれば、フィラーネック部とフィラーキャッププロテクターとの間に、フィラーキャッププロテクター側のSUS４３９ＡＬ材によってアルミメッキ層が形成されて、介在することになってよい。かかるアルミメッキ層の存在により、フィラーチューブとフィラーキャッププロテクターとの間に電位差が存する。これにより、先ず電位の低いアルミメッキ層が電位差により腐食されることになる。この結果、かかるアルミメッキ層が犠牲防食効果を発揮して、フィラーチューブ側の発錆を抑止することになる。結果的にフィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 With such a configuration, according to the embodiment of the present invention, an aluminum plating layer may be formed and interposed between the filler neck portion and the filler cap protector with the SUS439AL material on the filler cap protector side. Due to the presence of the aluminum plating layer, a potential difference exists between the filler tube and the filler cap protector. Thereby, first, the low-potential aluminum plating layer is corroded by the potential difference. As a result, such an aluminum plating layer exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　また、この発明における実施形態によれば、前記フィラーチューブを、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材（SUS４３９材）を使用して構成してよい。一方、前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.030％、Ｓｉ：≦1.00％、Ｍｎ：≦1.00％、Ｐ：≦0.04％、Ｓ：≦0.030％、Ｃｒ：10.50～11.45％、Ｔｉ：10（Ｃ＋Ｎ）～0.75％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成り且つ表面に前記アルミメッキ層を形成したフェライト系ステンレス鋼材（SUS４０９ＡＬ材）を使用することにより構成してよい。 Further, according to an embodiment of the present invention, the filler tube is made of C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00˜ A ferritic stainless steel material (SUS439 material) containing 18.00%, Ti: 10 (C + N) to 0.35%, N: ≦ 0.015%, the balance being inevitable impurities and Fe may be used. On the other hand, the filler cap protector comprises, in% by mass, C: ≦ 0.030%, Si: ≦ 1.00%, Mn: ≦ 1.00%, P: ≦ 0.04%, S: ≦ 0.030%, Cr: 10.50 to 11.45%, Ti : Consists of using ferritic stainless steel material (SUS409AL material) containing 10 (C + N) to 0.75%, N: ≤ 0.015, the balance consisting of inevitable impurities and Fe, and having the aluminum plating layer formed on the surface You can do it.
　かかる構成により、この発明における実施形態によれば、フィラーネック部とフィラーキャッププロテクターとの間に、フィラーキャッププロテクター側のSUS４０９ＡＬ材によってアルミメッキ層が形成され、介在することになってよい。かかるアルミメッキ層の存在により、フィラーチューブとフィラーキャッププロテクターとの間に電位差が生じる。これにより、先ず電位の低いアルミメッキ層が電位差腐食を起こすことになる。この結果、かかるアルミメッキ層が犠牲防食効果を発揮して、フィラーチューブ側の発錆を抑止することになる。結果的にフィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 With this configuration, according to the embodiment of the present invention, an aluminum plating layer may be formed and interposed between the filler neck portion and the filler cap protector using the SUS409AL material on the filler cap protector side. The presence of such an aluminum plating layer causes a potential difference between the filler tube and the filler cap protector. Thereby, first, an aluminum plating layer having a low potential causes potential difference corrosion. As a result, such an aluminum plating layer exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　しかも、この発明における実施形態によれば、たとえアルミメッキ層が電位差腐食の進行により腐食し切ったとしても、SUS４３９材により構成されるフィラーチューブに対して、SUS４０９ＡＬ材における基材であるSUS４０９材により構成されるフィラーキャッププロテクターの電位が低い。したがって、フィラーチューブとフィラーキャッププロテクターとの隙間部または溶接部において、酸素濃淡電池が形成される前に、フィラーキャッププロテクター側にフィラーチューブとの電位差による電位差腐食を優先的に発生させることになる。この結果、かかるフィラーキャッププロテクター側が犠牲防食効果を発揮して、フィラーチューブ側の発錆を抑止することになる。結果的にフィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 Moreover, according to the embodiment of the present invention, even if the aluminum plating layer is completely corroded by the progress of the potentiometric corrosion, the SUS409 material which is the base material in the SUS409AL material is used for the filler tube constituted by the SUS439 material. The potential of the constructed filler cap protector is low. Therefore, before the oxygen concentration cell is formed in the gap or welded portion between the filler tube and the filler cap protector, potential corrosion due to the potential difference with the filler tube is preferentially generated on the filler cap protector side. As a result, the filler cap protector side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　また、この発明における実施の形態は、前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材（SUS４３９材）を使用して構成してよい。一方、前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成り且つ表面に前記アルミメッキ層を形成したフェライト系ステンレス鋼材（SUS４３９ＡＬ材）を使用することにより構成してよい。 Further, according to an embodiment of the present invention, the filler tube is, in mass%, C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr : Ferritic stainless steel material (SUS439 material) containing 17.00 to 18.00%, Ti: 10 (C + N) to 0.35%, N: ≦ 0.015, the balance being inevitable impurities and Fe. On the other hand, the filler cap protector comprises, in% by mass, C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Ti : Consists of using ferritic stainless steel material (SUS439AL material) containing 10 (C + N) to 0.35%, N: ≤ 0.015, the balance consisting of inevitable impurities and Fe, and having the aluminum plating layer formed on the surface You can do it.
　かかる構成により、この発明における実施形態によれば、フィラーネック部とフィラーキャッププロテクターとの間に、フィラーキャッププロテクター側のSUS４３９ＡＬ材によって、アルミメッキ層が形成され、介在することになってよい。かかるアルミメッキ層の存在により、フィラーチューブとフィラーキャッププロテクターとの間に電位差が生じることになって、電位の低いアルミメッキ層に電位差腐食が生起することになる。この結果、かかるアルミメッキ層が犠牲防食効果を発揮して、フィラーチューブ側の発錆を抑止することになる。結果的にフィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 With such a configuration, according to the embodiment of the present invention, an aluminum plating layer may be formed and interposed between the filler neck portion and the filler cap protector using the SUS439AL material on the filler cap protector side. Due to the presence of the aluminum plating layer, a potential difference is generated between the filler tube and the filler cap protector, and potential difference corrosion occurs in the aluminum plating layer having a low potential. As a result, such an aluminum plating layer exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　また、この発明における実施形態によれば、前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るステンレス鋼材（SUS４３６材）を使用して構成してよい。一方、前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成り且つ表面にアルミメッキ層を形成したフェライト系ステンレス鋼材（SUS４３６ＡＬ材）を使用することにより構成してよい。 Further, according to the embodiment of the present invention, the filler tube is, in mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Uses stainless steel (SUS 436) containing Cr: 17.00-18.00%, Mo: 1.00-1.50%, Ti: 10 (C + N) -0.35%, N: ≤0.015%, the balance being inevitable impurities and Fe And may be configured. On the other hand, the filler cap protector is, in mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Mo : Ferritic stainless steel (SUS436AL material containing 1.00 to 1.50%, Ti: 10 (C + N) to 0.35%, N: ≦ 0.015%, the balance being inevitable impurities and Fe, and forming an aluminum plating layer on the surface ) May be used.
　かかる構成により、この発明における実施形態によれば、フィラーネック部とフィラーキャッププロテクターとの間に、フィラーキャッププロテクター側のSUS４３６ＡＬ材によって、アルミメッキ層が形成され、介在することになってよい。かかるアルミメッキ層の存在により、フィラーチューブとフィラーキャッププロテクターとの間に電位差が生じることになって、電位の低いアルミメッキ層が電位差腐食を起こすことになる。この結果、かかるアルミメッキ層が犠牲防食効果を発揮して、フィラーチューブ側の発錆を抑止することになる。結果的にフィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 With this configuration, according to the embodiment of the present invention, an aluminum plating layer may be formed and interposed between the filler neck portion and the filler cap protector using the SUS436AL material on the filler cap protector side. Due to the presence of the aluminum plating layer, a potential difference is generated between the filler tube and the filler cap protector, and the aluminum plating layer having a low potential causes potential difference corrosion. As a result, such an aluminum plating layer exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　［発明の効果］
　この発明の一態様によれば、フィラーチューブに対して、フィラーキャッププロテクターが、低い電位を有して構成されている。かかる電位差によって、フィラーチューブとフィラーキャッププロテクターとの隙間部または溶接部において、酸素濃淡電池が形成される前にフィラーキャッププロテクター側にフィラーチューブとの電位差による電位差腐食を優先的に発生させることになる。この結果、かかるフィラーキャッププロテクター側が犠牲防食効果を発揮して、フィラーチューブ側の発錆を抑止することになる。結果的にフィラーネック部における孔開き腐食を確実に防止して、フィラーネック部の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンクの気密性を確実に保持していることになる。 [The invention's effect]
According to one aspect of the present invention, the filler cap protector is configured to have a low potential with respect to the filler tube. Due to such a potential difference, potential difference corrosion due to the potential difference between the filler tube and the filler tube is preferentially generated on the filler cap protector side before the oxygen concentration cell is formed in the gap portion or welded portion between the filler tube and the filler cap protector. . As a result, the filler cap protector side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube side. As a result, it is possible to reliably prevent perforation corrosion at the filler neck, and to ensure the air tightness of the fuel tank, coupled with the fact that the filler neck opening side is sealed with the filler cap and is always closed. Will hold on to.
　また、この発明の一態様によれば、フィラーチューブとして、従来のような二重管方式を採らずにフィラーチューブ本体部とフィラーネック部とを一体構成のみとする構成の簡略化を図ることができる。これにより、部品点数の減数化による組立工数の軽減化を果たして、自動車の軽量化および低コスト化に寄与することができる。また、フィラーチューブ及びフィラーキャッププロテクターは、共にフェライト系ステンレス鋼材を使用して構成されることから、材料コストにおいても有利性を発揮することができる。 Moreover, according to one aspect of the present invention, the filler tube can be simplified in a configuration in which the filler tube main body portion and the filler neck portion are only integrated without adopting the conventional double tube method. it can. As a result, it is possible to reduce the number of assembly steps by reducing the number of parts, thereby contributing to weight reduction and cost reduction of the automobile. In addition, since both the filler tube and the filler cap protector are configured by using a ferritic stainless steel material, an advantage can be exhibited in material cost.
一般的な自動車の燃料タンク装置を概略的に描画した斜視図である。1 is a perspective view schematically illustrating a fuel tank device of a general automobile. この発明を採用したフィラーチューブ構造に係り、図１における一点鎖線円内を拡大して描画した縦断面図である。FIG. 2 is a longitudinal sectional view illustrating a filler tube structure adopting the present invention in an enlarged manner and drawn in a dot-dash line circle in FIG. 1. この発明を採用した実施例に係るフィラーチューブ本体又はフィラーキャッププロテクターを構成する各フェライト系ステンレス鋼材の成分表である。It is a component table | surface of each ferritic stainless steel material which comprises the filler tube main body or filler cap protector which concerns on the Example which employ | adopted this invention. この発明の実施例１から実施例７に係るフィラーチューブおよびフィラーキャッププロテクターを構成するフェライト系ステンレス鋼材の組合せを記載した表である。It is the table | surface which described the combination of the ferritic stainless steel material which comprises the filler tube and filler cap protector which concern on Example 1 to Example 7 of this invention. この発明の実施例に係るフィラーチューブ又はフィラーキャッププロテクターを構成するフェライト系ステンレス鋼材の平均電位（Ｖ）を示した表である。It is the table | surface which showed the average electric potential (V) of the ferritic stainless steel material which comprises the filler tube or filler cap protector which concerns on the Example of this invention. 図２における一点鎖線円内を拡大して描画した図である。It is the figure which expanded and drew the inside of the dashed-dotted line circle in FIG. ＣＣＴサイクル試験（腐食促進サイクル試験）によって、フィラーチューブの材質をSUS４３９材とし、フィラーキャッププロテクターの材質をSUS４０９材又はSUS４３９ＡＬ材とした場合の材質違いによる犠牲防食効果の差としての板厚残存率を比較したグラフである。The plate thickness remaining rate as a difference in sacrificial anticorrosion effect due to material difference when the filler tube material is SUS439 material and the filler cap protector material is SUS409 material or SUS439AL material by CCT cycle test (corrosion promotion cycle test). It is the graph compared. 従来の技術における図１の一点鎖線円内を拡大して描画した縦断面図である。It is the longitudinal cross-sectional view drawn by enlarging the dashed-dotted line circle | round | yen in FIG. 1 in a prior art.
　この発明の実施例に係るフィラーチューブは、従来のような二重管方式を採らずにフィラーチューブ本体部とフィラーネック部とを一体構成にすることで構成されている。しかも、このフィラーチューブは、材料コストの有利なフェライト系ステンレス鋼材を使用したとしても、フィラーチューブ側の発錆を抑止して、結果的にフィラーネック部における孔開き腐食の発生を確実に防止すると共に、部品点数の減数化に伴う組立工数を軽減させて、自動車の軽量化および低コスト化に寄与することができるように構成されている。 The filler tube according to the embodiment of the present invention is configured by integrating a filler tube main body portion and a filler neck portion without adopting a conventional double tube method. Moreover, this filler tube suppresses rusting on the filler tube side even if a ferritic stainless steel material having an advantageous material cost is used, and consequently prevents the occurrence of perforation corrosion in the filler neck portion. At the same time, the assembly man-hour associated with the reduction in the number of parts can be reduced to contribute to the reduction in weight and cost of the automobile.
　次に、図１から図７を用いて、この発明を採用した実施例に係る燃料タンクに用いるフィラーチューブ構造について説明する。 Next, a filler tube structure used for a fuel tank according to an embodiment employing the present invention will be described with reference to FIGS.
　先ず、図１において、燃料タンク１は、エンジンの動力源としてのガソリン燃料或いは軽油燃料を貯蔵する。燃料タンク１は、一方のタンク半体（例えば、アッパータンク）１ａと他方のタンク半体（例えば、ロアタンク）１ｂとをその周縁フランジ部同士を互いに接合することによって構成されている。 First, in FIG. 1, the fuel tank 1 stores gasoline fuel or light oil fuel as a power source of the engine. The fuel tank 1 is constituted by joining one peripheral half of a tank half (for example, an upper tank) 1a and the other half tank (for example, a lower tank) 1b to each other.
　燃料タンク１には、自動車の動力源となる燃料を燃料タンク１内に給油するフィラーチューブ２が装着されている。 The fuel tank 1 is provided with a filler tube 2 for supplying fuel serving as a power source of the automobile into the fuel tank 1.
　フィラーチューブ２は、一端側が燃料タンク１側に接続されたフィラーチューブ本体部３と、図２に詳細に示すように、フィラーチューブ本体部３の他端側に一体形成されて構成されるフィラーネック部４とを有して構成されている。 The filler tube 2 includes a filler tube main body 3 having one end connected to the fuel tank 1 and a filler neck formed integrally with the other end of the filler tube main body 3 as shown in detail in FIG. Part 4.
　フィラーネック部４は、ほぼ直状管に形成されたフィラーチューブ本体部３に対して徐々に拡径しながら直状管に形成されたフィラーネック部側嵌合部４ａと、フィラーネック部側嵌合部４ａの先端部が略ラッパ状に形成された給油口部４ｂとで構成されている。 The filler neck portion 4 includes a filler neck portion side fitting portion 4a formed on the straight tube while gradually increasing the diameter with respect to the filler tube main body portion 3 formed on the substantially straight tube, and a filler neck portion side fitting. The front end portion of the joint portion 4a is composed of an oil filler port portion 4b formed in a substantially trumpet shape.
　フィラーネック部４のフィラーネック部側嵌合部４ａの外周側には、フィラーキャッププロテクター側嵌合部５ａが嵌合されている。フィラーキャッププロテクター側嵌合部５ａは、一端側がグロメット６を介在させて車体パネル７に取り付けられるフィラーキャッププロテクター５の他端側である。フィラーキャッププロテクター側嵌合部５ａとフィラーネック部側嵌合部４ａとは、スポット溶接などにより溶着することにより、嵌合部８を構成している。 The filler cap protector side fitting part 5a is fitted to the outer peripheral side of the filler neck part side fitting part 4a of the filler neck part 4. The filler cap protector side fitting portion 5 a is the other end side of the filler cap protector 5 attached to the vehicle body panel 7 with one end side interposed with the grommet 6. The filler cap protector side fitting part 5a and the filler neck part side fitting part 4a constitute the fitting part 8 by welding by spot welding or the like.
　フィラーネック部４の給油口部４ｂは、不図示のフィラーキャップによって、閉塞されるように構成されている。従って、かかるフィラーキャップは、フィラーネック部４と共に、フィラーキャッププロテクター５によって囲繞されて、自動車が衝突事故などに遭遇した際に損壊しないように構成されることになる。 The filler opening 4b of the filler neck 4 is configured to be closed by a filler cap (not shown). Accordingly, the filler cap is surrounded by the filler cap protector 5 together with the filler neck portion 4 so as not to be damaged when the automobile encounters a collision accident or the like.
　そして、この発明を採用したに係る実施例においては、図３に示す材料ａから材料ｃを主体とするフェライト系ステンレス鋼材を用いて、フィラーチューブ２又はフィラーキャッププロテクター５を構成している（なお、これらのフェライト系鋼材のいずれかをフィラーチューブ２又はフィラーキャッププロテクター５に具体的に使用するかについては後述する）。 And in the Example which employ | adopts this invention, the filler tube 2 or the filler cap protector 5 is comprised using the ferritic stainless steel materials which mainly consist of the material c from the material a shown in FIG. The specific use of any of these ferritic steel materials for the filler tube 2 or the filler cap protector 5 will be described later).
　先ず、材料ａ（SUS４０９材）は、ＪＩＳ規格のSUS４０９鋼材に相当するものである。材料ａは、図３に示すように、次に記載の質量％の成分を含有した化学組成を有するフェライト系ステンレス鋼である。 First, material a (SUS409 material) corresponds to JIS standard SUS409 steel material. As shown in FIG. 3, the material a is a ferritic stainless steel having a chemical composition containing the following mass% components.
　Ｃ：≦0.03％　　　　　　Ｓｉ：≦1.00％　　　Ｍｎ：≦1.00％
　Ｐ：≦0.04％　　　　　　Ｓ　：≦0.03％　　　Ｃｒ：10.50～11.45％
　Ｔi：≦10（C+N）～0.75％ Ｎ ：≦0.015％　　　残部：Fe及び不可避的不純物 C: ≦ 0.03% Si: ≦ 1.00% Mn: ≦ 1.00%
P: ≤ 0.04% S: ≤ 0.03% Cr: 10.50-11.45%
Ti: ≦ 10 (C + N) to 0.75% N: ≦ 0.015% Remaining: Fe and inevitable impurities
　また、材料ｂ(SUS４３９材)は、図３に示すように、次に記載の質量％の成分を含有した化学組成を有するフェライト系ステンレス鋼である。 Further, as shown in FIG. 3, the material b (SUS439 material) is a ferritic stainless steel having a chemical composition containing the following mass% components.
　Ｃ：≦0.01％　　　　　　Ｓｉ：≦1.00％　　　Ｍｎ：≦0.20％
　Ｐ：≦0.04％　　　　　　Ｓ　：≦0.006％　 　Ｃｒ：17.00～18.00％
　Ｔi：≦10（C+N）～0.35％ Ｎ ：≦0.015％　　　残部：Fe及び不可避的不純物 C: ≦ 0.01% Si: ≦ 1.00% Mn: ≦ 0.20%
P: ≤ 0.04% S: ≤ 0.006% Cr: 17.00-18.00%
Ti: ≦ 10 (C + N) to 0.35% N: ≦ 0.015% Remaining: Fe and inevitable impurities
　更に、材料ｃ（SUS４３６材）は、図３に示すように、次に記載の質量％の成分を含有した化学組成を有するフェライト系ステンレス鋼である。 Furthermore, as shown in FIG. 3, the material c (SUS 436 material) is a ferritic stainless steel having a chemical composition containing the following mass% components.
　Ｃ ：≦0.01％　　　　　Ｓｉ：≦0.14％　　　     Ｍｎ：≦0.20％
　Ｐ ：≦0.04％　　　　　Ｓ　：≦0.006％　 　     Ｃｒ：17.00～18.00％
　Ｍo：1.00～1.50％　　  Ｔi：≦10（C+N）～0.35％  Ｎ ：≦0.015％
　残部：Fe及び不可避的不純物 C: ≦ 0.01% Si: ≦ 0.14% Mn: ≦ 0.20%
P: ≤0.04% S: ≤0.006% Cr: 17.00 to 18.00%
Mo: 1.00 to 1.50% Ti: ≤ 10 (C + N) to 0.35% N: ≤ 0.015%
The rest: Fe and inevitable impurities
　次に、このような化学組成を有するフェライト系ステンレス鋼を選択的に使用して構成するフィラーチューブ構造に係るこの発明を採用した具体例として、実施例１から７について順次説明する。 Next, Examples 1 to 7 will be sequentially described as specific examples employing the present invention relating to a filler tube structure configured by selectively using ferritic stainless steel having such a chemical composition.
　そして、かかる実施例１から７におけるフィラーチューブ２及びフィラーキャッププロテクター５は、それぞれ図４に示すようなSUS４０９材、SUS４３９材、又はSUS４３６材のいずれかから成るフェライト系ステンレス鋼材、更にはSUS４０９材、SUS４３９材、又はSUS４３６材の表面に純粋のアルミ或いは例えば８％のシリコンを含有し残部が純粋なアルミから成る一般的なアルミ合金をメッキしたアルミメッキ層（酸化被膜層）を有して構成するSUS４０９ＡＬ材、SUS４３９ＡＬ材、又はSUS４３６ＡＬ材にいずれかを選択組合せすることによって構成している。 And the filler tube 2 and the filler cap protector 5 in Examples 1 to 7 are each a ferritic stainless steel material made of SUS409 material, SUS439 material, or SUS436 material as shown in FIG. The surface of the SUS439 material or SUS436 material has an aluminum plating layer (oxide film layer) plated with pure aluminum or a general aluminum alloy containing, for example, 8% silicon and the balance being pure aluminum. It is configured by selectively combining any one of SUS409AL material, SUS439AL material, or SUS436AL material.
　また、かかる実施例１から７におけるフィラーチューブ２及びフィラーキャッププロテクター５を構成するフェライト系ステンレス鋼材は、それぞれ、図５に示すような平均電位（Ｖ）を有するものである。 In addition, the ferritic stainless steel materials constituting the filler tube 2 and the filler cap protector 5 in Examples 1 to 7 each have an average potential (V) as shown in FIG.
　かかる平均電位（Ｖ）は、温度３５℃に熱した５０ｇ／ＬのＮａＣｌの溶液内に、４時間浸漬するという測定条件（ＣＣＴサイクル試験（腐食促進サイクル試験）における所謂塩害過酷地域における測定条件に相当する）のもとに、各フェライト系ステンレス鋼材（アルミメッキ鋼材を含む）の腐食電位を測定することにより行ったものである。 Such an average potential (V) is a measurement condition in a so-called salt damage severe area in a measurement condition (CCT cycle test (corrosion promotion cycle test)) of immersion in a 50 g / L NaCl solution heated to a temperature of 35 ° C. for 4 hours. (Corresponding)) by measuring the corrosion potential of each ferritic stainless steel material (including aluminized steel material).
　なお、上記ＣＣＴサイクル試験は、自動車における種々の使用環境地域における雨水または塩水などの大気腐食環境を想定し、気候または湿度の変化、或いは降雨天候などに応じて、鋼材が乾湿の繰り返しを受けたことによる腐食度を測定することにより行われる。 In addition, the CCT cycle test assumed atmospheric corrosive environment such as rain water or salt water in various usage environment areas in automobiles, and steel materials were repeatedly subjected to dry and wet depending on changes in climate or humidity, or rainy weather. This is done by measuring the degree of corrosion.
　これらの腐食電位の測定結果に基づき、先ず、実施例１においては、フィラーチューブ２は、「SUS４３６材」を使用して構成している。一方、フィラーキャッププロテクター５は、「SUS４０９材」を使用して構成している。 Based on the measurement results of these corrosion potentials, first, in Example 1, the filler tube 2 is constituted by using “SUS436 material”. On the other hand, the filler cap protector 5 is configured using “SUS409 material”.
　そして、図５に示すように、「SUS４３６材」は、平均電位が「－０.０８Ｖ」である。一方、「SUS４０９材」は、平均電位が「－０．１０Ｖ」である。 As shown in FIG. 5, the “SUS436 material” has an average potential of “−0.08V”. On the other hand, the “SUS409 material” has an average potential of “−0.10 V”.
　従って、フィラーチューブ２の平均電位が「－０．０８Ｖ」であり、フィラーキャッププロテクター５の平均電位が「－０．１０Ｖ」である。このように嵌合部８において電位差が現れることになる。 Therefore, the average potential of the filler tube 2 is “−0.08 V”, and the average potential of the filler cap protector 5 is “−0.10 V”. Thus, a potential difference appears in the fitting portion 8.
　かかる電位差によって、フィラーチューブ２におけるフィラーネック部４のフィラーネック部側嵌合部４ａとフィラーキャッププロテクター５のフィラーキャッププロテクター側嵌合部５ａとの隙間部または溶接部において、酸素濃淡電池が形成される前に、フィラーキャッププロテクター５側にフィラーチューブ２との電位差による電位差腐食を優先的に発生させることになる。この結果、かかるフィラーキャッププロテクター５側が犠牲防食効果を発揮して、フィラーチューブ２側の発錆を抑止することになる。結果的にフィラーネック部４における孔開き腐食を確実に防止して、フィラーネック部４の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンク１の気密性を確実に保持していることになる。 Due to such a potential difference, an oxygen concentration cell is formed in a gap portion or a welded portion between the filler neck side fitting portion 4a of the filler neck portion 4 in the filler tube 2 and the filler cap protector side fitting portion 5a of the filler cap protector 5. Before this, potential difference corrosion due to a potential difference with the filler tube 2 is preferentially generated on the filler cap protector 5 side. As a result, the filler cap protector 5 side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side. As a result, the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
　しかも、実施例１において、フィラーチューブ２が、フィラーチューブ本体部３とフィラーネック部４とを一体形成することにより構成されている。従来のような別体製のフィラーネック補助体を用いた二重管方式を採っていない。これにより、部品点数の減数化によって組立工数を軽減させることができ、自動車の軽量化および低コスト化に寄与することになる。 Moreover, in Example 1, the filler tube 2 is configured by integrally forming the filler tube main body portion 3 and the filler neck portion 4. The double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Thereby, the assembly man-hour can be reduced by reducing the number of parts, which contributes to weight reduction and cost reduction of the automobile.
　加えて、実施例１において、フィラーチューブ２及びフィラーキャッププロテクター５は、共にフェライト系ステンレス鋼材を使用して構成されている。これにより、材料コストにおいても有利性を発揮することができる。 In addition, in Example 1, both the filler tube 2 and the filler cap protector 5 are configured using a ferritic stainless steel material. Thereby, an advantage can be exhibited also in material cost.
　次に、実施例２においては、フィラーチューブ２は、「SUS４３９材」を使用して構成されている。一方、フィラーキャッププロテクター５は、「SUS４０９材」を使用して構成されている。 Next, in Example 2, the filler tube 2 is configured using “SUS439 material”. On the other hand, the filler cap protector 5 is configured using “SUS409 material”.
　そして、図４に示すように、「SUS４３９材」の平均電位は、「－０．０８Ｖ」である。一方、「SUS４０９材」の平均電位は、「－０．１０Ｖ」である。 As shown in FIG. 4, the average potential of “SUS439 material” is “−0.08 V”. On the other hand, the average potential of “SUS409 material” is “−0.10 V”.
　従って、フィラーチューブ２の平均電位が「－０．０８Ｖ」であり、フィラーキャッププロテクター５の平均電位が「－０．１０Ｖ」である。このように嵌合部８において電位差が現れることになる。 Therefore, the average potential of the filler tube 2 is “−0.08 V”, and the average potential of the filler cap protector 5 is “−0.10 V”. Thus, a potential difference appears in the fitting portion 8.
　かかる電位差によって、フィラーチューブ２におけるフィラーネック部４のフィラーネック部側嵌合部４ａとフィラーキャッププロテクター５のフィラーキャッププロテクター側嵌合部５ａとの隙間部または溶接部において、酸素濃淡電池が形成される前に、フィラーキャッププロテクター５側にフィラーチューブ２との電位差による電位差腐食を優先的に発生させることになる。この結果、かかるフィラーキャッププロテクター５側が犠牲防食効果を発揮して、フィラーチューブ２側の発錆を抑止することになる。結果的にフィラーネック部４における孔開き腐食を確実に防止して、フィラーネック部４の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンク１の気密性を確実に保持していることになる。 Due to such a potential difference, an oxygen concentration cell is formed in a gap portion or a welded portion between the filler neck side fitting portion 4a of the filler neck portion 4 in the filler tube 2 and the filler cap protector side fitting portion 5a of the filler cap protector 5. Before this, potential difference corrosion due to a potential difference with the filler tube 2 is preferentially generated on the filler cap protector 5 side. As a result, the filler cap protector 5 side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side. As a result, the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
　しかも、実施例２においても、フィラーチューブ２が、フィラーチューブ本体部３とフィラーネック部４とを一体形成することにより構成されている。従来のような別体製のフィラーネック補助体を用いた二重管方式を採っていない。したがって、部品点数の減数化によって組立工数を軽減させることができ、自動車の軽量化および低コスト化に寄与することになる。 Moreover, also in Example 2, the filler tube 2 is configured by integrally forming the filler tube main body portion 3 and the filler neck portion 4. The double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Therefore, the number of parts can be reduced by reducing the number of parts, which contributes to the weight reduction and cost reduction of the automobile.
　加えて、実施例２においても、フィラーチューブ２及びフィラーキャッププロテクター５は、共にフェライト系ステンレス鋼材を使用して構成されている。よって、材料コストにおいても有利性を発揮することができる。 In addition, also in Example 2, the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage can be exhibited also in material cost.
　また、実施例３においては、フィラーチューブ２は、「SUS４３６材」を使用して構成されている。一方、フィラーキャッププロテクター５は、アルミメッキを施したステンレス鋼材である「SUS４０９ＡＬ材」を使用して構成されている。 Further, in Example 3, the filler tube 2 is configured using “SUS436 material”. On the other hand, the filler cap protector 5 is configured using “SUS409AL material” which is a stainless steel material subjected to aluminum plating.
　この結果、フィラーネック部側嵌合部４ａとフィラーキャッププロテクター側嵌合部５ａとの間に、図６に示すように、アルミメッキ層９が形成されることになる。 As a result, an aluminum plating layer 9 is formed between the filler neck portion side fitting portion 4a and the filler cap protector side fitting portion 5a as shown in FIG.
　そして、図５に示すように、「SUS４３６材」から成るステンレス鋼材の平均電位は「－０．０８Ｖ」である。一方、「SUS４０９材」からなるステンレス鋼材の平均電位は「－０．１０Ｖ」である。さらに、「SUS４３９ＡＬ材」からなるフェライト系ステンレス鋼材の平均電位は、その表面にアルミメッキ層９が形成されていることから、「－０．７０」となる。 As shown in FIG. 5, the average potential of the stainless steel material made of “SUS436 material” is “−0.08 V”. On the other hand, the average potential of the stainless steel material made of “SUS409 material” is “−0.10 V”. Further, the average potential of the ferritic stainless steel material made of “SUS439AL material” is “−0.70” because the aluminum plating layer 9 is formed on the surface thereof.
　従って、かかる構成により、実施例３においては、フィラーネック部４とフィラーキャッププロテクター５との間に、フィラーキャッププロテクター５側の「SUS４０９ＡＬ材」からなるフェライト系ステンレス鋼材によるアルミメッキ層９が形成され、介在することになる。かかるアルミメッキ層９の存在により、フィラーチューブ２とフィラーキャッププロテクター５との間に電位差が生じることになる。これにより、電位の低いアルミメッキ層９が電位差腐食を優先的に生起することになる。この結果、かかるアルミメッキ層９が犠牲防食効果を発揮して、フィラーチューブ２側の発錆を抑止することになる。結果的にフィラーネック部４における孔開き腐食を確実に防止して、フィラーネック部４の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンク１の気密性を確実に保持していることになる。 Therefore, with this configuration, in Example 3, an aluminum plating layer 9 made of a ferritic stainless steel material made of “SUS409AL material” on the filler cap protector 5 side is formed between the filler neck portion 4 and the filler cap protector 5. , Will intervene. The presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5. Thereby, the aluminum plating layer 9 having a low potential causes potential difference corrosion preferentially. As a result, the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side. As a result, the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
　しかも、実施例３においては、たとえアルミメッキ層９が電位差腐食の進行により腐食し切ったとしても、「SUS４３６材」からなるステンレス鋼材により構成するフィラーチューブ２に対して、「SUS４０９ＡＬ材」における基材である「SUS４０９材」からなるステンレス鋼材により構成するフィラーキャッププロテクター５の電位が低い。これにより、フィラーチューブ２とフィラーキャッププロテクター５との隙間部または溶接部において、酸素濃淡電池が形成される前に、フィラーキャッププロテクター５側がフィラーチューブ２との電位差による電位差腐食を優先的に発生させることになる。この結果、かかるフィラーキャッププロテクター５側が犠牲防食効果を発揮して、フィラーチューブ２側の発錆を抑止することになる。結果的にフィラーネック部４における孔開き腐食を確実に防止して、フィラーネック部４の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンク１の気密性を確実に保持していることになる。 Moreover, in Example 3, even if the aluminum plating layer 9 is completely corroded by the progress of the potentiometric corrosion, the base in the “SUS409AL material” is compared with the filler tube 2 made of the stainless steel material made of “SUS436 material”. The potential of the filler cap protector 5 made of a stainless steel material made of “SUS409 material” as a material is low. Thereby, before the oxygen concentration cell is formed in the gap or welded portion between the filler tube 2 and the filler cap protector 5, the filler cap protector 5 side preferentially generates potential difference corrosion due to the potential difference with the filler tube 2. It will be. As a result, the filler cap protector 5 side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side. As a result, the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
　また、実施例３において、フィラーチューブ２が、フィラーチューブ本体部３とフィラーネック部４とを一体形成すると共に、フィラーキャッププロテクター５の表面におけるアルミメッキ層９をアルミメッキすることにより形成することにより、構成する。従来のような別体製のフィラーネック補助体を用いた二重管方式を採っていない。したがって、部品点数の減数化に伴う組立工数を軽減させてき、自動車の軽量化や低コスト化に寄与することができる。 Moreover, in Example 3, the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. ,Constitute. The double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Therefore, it is possible to reduce the assembly man-hours associated with the reduction in the number of parts, thereby contributing to the weight reduction and cost reduction of the automobile.
　加えて、実施例３においても、フィラーチューブ２及びフィラーキャッププロテクター５は、共にフェライト系ステンレス鋼材を使用して構成されている。よって、材料コストにおいても有利性を発揮することができる。 In addition, also in Example 3, the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage can be exhibited also in material cost.
　次に、実施例４においては、フィラーチューブ２は、「SUS４３６材」を使用して構成されている。一方、フィラーキャッププロテクター５は、アルミメッキを施した「SUS４３９ＡＬ材」を使用して構成されている。 Next, in Example 4, the filler tube 2 is configured using “SUS436 material”. On the other hand, the filler cap protector 5 is configured using “SUS439AL material” plated with aluminum.
　この結果、フィラーネック部側嵌合部４ａとフィラーキャッププロテクター側嵌合部５ａとの間に、図６に示すように、アルミメッキ層９が形成されることになる。 As a result, an aluminum plating layer 9 is formed between the filler neck portion side fitting portion 4a and the filler cap protector side fitting portion 5a as shown in FIG.
　そして、図５に示すように、「SUS４３６材」から成るステンレス鋼材の平均電位が「－０．０８Ｖ」である。一方、「SUS４３９ＡＬ材」から成るステンレス鋼材の平均電位は、その表面にアルミメッキ層９が形成されていることから、「－０．７０Ｖ」となる。 And, as shown in FIG. 5, the average potential of the stainless steel material made of “SUS436 material” is “−0.08 V”. On the other hand, the average potential of the stainless steel material made of “SUS439AL material” is “−0.70 V” because the aluminum plating layer 9 is formed on the surface thereof.
　従って、かかる構成により、実施例４においては、フィラーネック部４とフィラーキャッププロテクター５との間に、フィラーキャッププロテクター５側のSUS４０９ＡＬ材からなるステンレス鋼材によるアルミメッキ層９が形成され、介在することになる。かかるアルミメッキ層９の存在により、フィラーチューブ２とフィラーキャッププロテクター５との間に電位差が生じることになる。電位の低いアルミメッキ層９が電位差腐食による腐食を生起することになる。この結果、かかるアルミメッキ層９が犠牲防食効果を発揮して、フィラーチューブ２側の発錆を抑止することになる。結果的にフィラーネック部４における孔開き腐食を確実に防止して、フィラーネック部４の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンク１の気密性を確実に保持していることになる。 Therefore, with this configuration, in Example 4, the aluminum plating layer 9 made of a stainless steel material made of SUS409AL material on the filler cap protector 5 side is formed and interposed between the filler neck portion 4 and the filler cap protector 5. become. The presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5. The aluminum plating layer 9 having a low potential causes corrosion due to potential difference corrosion. As a result, the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side. As a result, the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
　また、実施例４においても、フィラーチューブ２が、フィラーチューブ本体部３とフィラーネック部４とを一体形成すると共に、フィラーキャッププロテクター５の表面におけるアルミメッキ層９をアルミメッキすることにより形成することにより、構成される。従来のような別体製のフィラーネック補助体を用いた二重管方式を採っていない。したがって、部品点数の減数化に伴う組立工数を軽減させてき、自動車の軽量化や低コスト化に寄与することができる。 Also in Example 4, the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. It is comprised by. The double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Therefore, it is possible to reduce the assembly man-hours associated with the reduction in the number of parts, thereby contributing to the weight reduction and cost reduction of the automobile.
　加えて、実施例４においても、フィラーチューブ２及びフィラーキャッププロテクター５は、共にフェライト系ステンレス鋼材を使用して構成されている。したがって、材料コストにおいても有利性を発揮することになる。 In addition, also in Example 4, the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage is also exhibited in the material cost.
　次に、実施例５においては、フィラーチューブ２は、「SUS４３９材」を使用して構成されている。一方、フィラーキャッププロテクター５は、アルミメッキを施したステンレス鋼材の「SUS４０９ＡＬ材」を使用して構成されている。 Next, in Example 5, the filler tube 2 is configured using “SUS439 material”. On the other hand, the filler cap protector 5 is configured by using “SUS409AL material” which is an aluminum-plated stainless steel material.
　そして、図４に示すように、「SUS４３９材」から成るフェライト系ステンレス鋼材の平均電位が「－０．０８Ｖ」である。一方、「SUS４０９材」から成るフェライト系ステンレス鋼材の平均電位が「－０．１０Ｖ」である。「SUS４０９ＡＬ材」から成るステンレス鋼材の平均電位は、その表面にアルミメッキ層９が形成されていることから、「－０．７０Ｖ」となる。 As shown in FIG. 4, the average potential of the ferritic stainless steel material made of “SUS439 material” is “−0.08 V”. On the other hand, the average potential of the ferritic stainless steel material made of “SUS409 material” is “−0.10 V”. The average potential of the stainless steel material made of “SUS409AL material” is “−0.70 V” because the aluminum plating layer 9 is formed on the surface thereof.
　従って、かかる構成により、実施例５においては、フィラーネック部４とフィラーキャッププロテクター５との間に、フィラーキャッププロテクター５側の「SUS４０９ＡＬ材」からなるステンレス鋼材によるアルミメッキ層９が形成され、介在することになる。かかるアルミメッキ層９の存在により、フィラーチューブ２とフィラーキャッププロテクター５との間に電位差が生じることになる。これにより、電位の低いアルミメッキ層９側に電位差腐食が優先的に生起することになる。この結果、かかるアルミメッキ層９が犠牲防食効果を発揮して、フィラーチューブ２側の発錆を抑止することができる。結果的にフィラーネック部４における孔開き腐食を確実に防止して、フィラーネック部４の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンク１の気密性を確実に保持していることになる。 Therefore, with this configuration, in Example 5, an aluminum plating layer 9 made of a stainless steel material made of “SUS409AL material” on the filler cap protector 5 side is formed between the filler neck portion 4 and the filler cap protector 5 and is interposed. Will do. The presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5. Thereby, potential difference corrosion preferentially occurs on the side of the aluminum plating layer 9 having a low potential. As a result, the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and can suppress rusting on the filler tube 2 side. As a result, the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
　しかも、実施例５においては、たとえアルミメッキ層９が電位差腐食の進行により腐食し切ったとしても、「SUS４３９材」からなるフェライト系ステンレス鋼材により構成するフィラーチューブ２に対して、「SUS４０９ＡＬ材」における基材である「SUS４０９材」からなるフェライト系ステンレス鋼材により構成するフィラーキャッププロテクター５の電位が低いことから、フィラーチューブ２とフィラーキャッププロテクター５との隙間部または溶接部において、酸素濃淡電池が形成される前に、フィラーキャッププロテクター５側がフィラーチューブ２との電位差による電位差腐食を優先的に発生させることになる。この結果、かかるフィラーキャッププロテクター５側が犠牲防食効果を発揮して、フィラーチューブ２側の発錆を抑止することになる。結果的にフィラーネック部４における孔開き腐食を確実に防止して、フィラーネック部４の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンク１の気密性を確実に保持していることになる。 Moreover, in Example 5, even if the aluminum plating layer 9 is completely corroded by the progress of the potential difference corrosion, the “SUS409AL material” is used for the filler tube 2 made of the ferritic stainless steel material made of “SUS439 material”. Since the potential of the filler cap protector 5 made of a ferritic stainless steel material made of “SUS409 material” which is the base material in FIG. 3 is low, an oxygen concentration cell is formed in the gap or welded portion between the filler tube 2 and the filler cap protector 5. Before being formed, the filler cap protector 5 side preferentially generates potential difference corrosion due to a potential difference with the filler tube 2. As a result, the filler cap protector 5 side exhibits a sacrificial anticorrosive effect and suppresses rusting on the filler tube 2 side. As a result, the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
　また、実施例５においても、フィラーチューブ２が、フィラーチューブ本体部３とフィラーネック部４とを一体形成すると共に、フィラーキャッププロテクター５の表面におけるアルミメッキ層９をアルミメッキすることにより形成することにより、構成される。従来のような別体製のフィラーネック補助体を用いた二重管方式を採っていない。これにより、部品点数の減数化に伴う組立工数を軽減させてき、自動車の軽量化や低コスト化に寄与することができる。 Also in Example 5, the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. It is comprised by. The double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Thereby, the assembly man-hour accompanying reduction of a number of parts can be reduced, and it can contribute to the weight reduction and cost reduction of a motor vehicle.
　加えて、実施例５において、フィラーチューブ２及びフィラーキャッププロテクター５は、共にフェライト系ステンレス鋼材を使用して構成されている。したがって、材料コストにおいても有利であるといえる。 In addition, in Example 5, the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, it can be said that it is advantageous also in material cost.
　次に、実施例６においては、フィラーチューブ２は、「SUS４３９材」を使用して構成されている。一方、フィラーキャッププロテクター５は、アルミメッキを施した「SUS４３９ＡＬ材」を使用して構成されている。 Next, in Example 6, the filler tube 2 is configured using “SUS439 material”. On the other hand, the filler cap protector 5 is configured using “SUS439AL material” plated with aluminum.
　この結果、フィラーネック部側嵌合部４ａとフィラーキャッププロテクター側嵌合部５ａとの間に、図６に示すように、アルミメッキ層９が形成されることになる。 As a result, an aluminum plating layer 9 is formed between the filler neck portion side fitting portion 4a and the filler cap protector side fitting portion 5a as shown in FIG.
　そして、図５に示すように、「SUS４３９材」から成るフェライト系ステンレス鋼材の平均電位が「－０．０８Ｖ」である。一方、「SUS４３９ＡＬ材」から成るフェライト系ステンレス鋼材の平均電位は、その表面にアルミメッキ層９が形成されていることから、「－０．７０Ｖ」となる。 As shown in FIG. 5, the average potential of the ferritic stainless steel material made of “SUS439 material” is “−0.08 V”. On the other hand, the average potential of the ferritic stainless steel material made of “SUS439AL material” is “−0.70 V” because the aluminum plating layer 9 is formed on the surface thereof.
　従って、かかる構成により、実施例６においては、フィラーネック部４とフィラーキャッププロテクター５との間に、フィラーキャッププロテクター５側のSUS４３９ＡＬ材からなるフェライト系ステンレス鋼材によるアルミメッキ層９が形成され、介在することになる。かかるアルミメッキ層９の存在により、フィラーチューブ２とフィラーキャッププロテクター５との間に電位差が生じることになる。これにより、電位が低いアルミメッキ層９側に電位差腐食を優先的に起こすことになる。この結果、かかるアルミメッキ層９が犠牲防食効果を発揮して、フィラーチューブ２側の発錆を抑止することができる。結果的にフィラーネック部４における孔開き腐食を確実に防止して、フィラーネック部４の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンク１の気密性を確実に保持していることになる。 Therefore, with this configuration, in Example 6, an aluminum plating layer 9 made of a ferritic stainless steel material made of SUS439AL material on the filler cap protector 5 side is formed between the filler neck portion 4 and the filler cap protector 5, and is interposed. Will do. The presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5. As a result, potential difference corrosion is preferentially caused on the side of the aluminum plating layer 9 having a low potential. As a result, the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and can suppress rusting on the filler tube 2 side. As a result, the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
　また、実施例６においても、フィラーチューブ２が、フィラーチューブ本体部３とフィラーネック部４とを一体形成すると共に、フィラーキャッププロテクター５の表面におけるアルミメッキ層９をアルミメッキすることにより形成することにより、構成される。従来のような別体製のフィラーネック補助体を用いた二重管方式を採っていない。したがって、部品点数の減数化に伴う組立工数を軽減させてき、自動車の軽量化や低コスト化に寄与することができる。 Also in Example 6, the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. It is comprised by. The double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. Therefore, it is possible to reduce the assembly man-hours associated with the reduction in the number of parts, thereby contributing to the weight reduction and cost reduction of the automobile.
　加えて、実施例６においても、フィラーチューブ２及びフィラーキャッププロテクター５は、共にフェライト系ステンレス鋼材を使用して構成されている。したがって、材料コストにおいても有利性を発揮することになる。 In addition, also in Example 6, the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage is also exhibited in the material cost.
　次に、実施例７においては、フィラーチューブ２は、「SUS４３６材」を使用して構成されている。一方、フィラーキャッププロテクター５は、アルミメッキを施した「SUS４３６ＡＬ材」を使用して構成されている。 Next, in Example 7, the filler tube 2 is configured using “SUS436 material”. On the other hand, the filler cap protector 5 is configured using “SUS436AL material” plated with aluminum.
　この結果、フィラーネック部側嵌合部４ａとフィラーキャッププロテクター側嵌合部５ａとの間に、図６に示すように、アルミメッキ層９が形成されることになる。 As a result, an aluminum plating layer 9 is formed between the filler neck portion side fitting portion 4a and the filler cap protector side fitting portion 5a as shown in FIG.
　そして、図５に示すように、「SUS４３６材」から成るフェライト系ステンレス鋼材の平均電位が「－０．０８Ｖ」である。一方、「SUS４３６ＡＬ材」から成るフェライト系ステンレス鋼材の平均電位は、その表面にアルミメッキ層９が形成されていることから、「－０．７０Ｖ」となる。 As shown in FIG. 5, the average potential of the ferritic stainless steel material made of “SUS436 material” is “−0.08 V”. On the other hand, the average potential of the ferritic stainless steel material made of “SUS436AL material” is “−0.70 V” because the aluminum plating layer 9 is formed on the surface thereof.
　従って、かかる構成により、実施例７においては、フィラーネック部４とフィラーキャッププロテクター５との間に、フィラーキャッププロテクター５側の「SUS４０９ＡＬ材」からなるフェライト系ステンレス鋼材によるアルミメッキ層９が形成され、介在することになる。かかるアルミメッキ層９の存在により、フィラーチューブ２とフィラーキャッププロテクター５との間に電位差が生じることになる。これにより、電位が低いアルミメッキ層９側に電位差腐食が優先的に起こることになる。この結果、かかるアルミメッキ層９が犠牲防食効果を発揮して、フィラーチューブ２側の発錆を抑止することができる。結果的にフィラーネック部４における孔開き腐食を確実に防止して、フィラーネック部４の開口側がフィラーキャップとの間で密閉され常に閉塞状態であることと相俟って、燃料タンク１の気密性を確実に保持していることになる。 Therefore, with this configuration, in Example 7, the aluminum plating layer 9 made of a ferritic stainless steel material made of “SUS409AL material” on the filler cap protector 5 side is formed between the filler neck portion 4 and the filler cap protector 5. , Will intervene. The presence of the aluminum plating layer 9 causes a potential difference between the filler tube 2 and the filler cap protector 5. Thereby, potential difference corrosion preferentially occurs on the side of the aluminum plating layer 9 having a low potential. As a result, the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect and can suppress rusting on the filler tube 2 side. As a result, the perforation corrosion in the filler neck portion 4 is reliably prevented, and the opening side of the filler neck portion 4 is sealed between the filler cap and is always in a closed state. The sex is surely retained.
　また、実施例７においても、フィラーチューブ２が、フィラーチューブ本体部３とフィラーネック部４とを一体形成すると共に、フィラーキャッププロテクター５の表面におけるアルミメッキ層９をアルミメッキすることにより形成することにより、構成される。従来のような別体製のフィラーネック補助体を用いた二重管方式を採っていない。部品点数の減数化に伴う組立工数を軽減させてき、自動車の軽量化や低コスト化に寄与することができる。 Also in Example 7, the filler tube 2 is formed by integrally forming the filler tube main body portion 3 and the filler neck portion 4 and aluminizing the aluminum plating layer 9 on the surface of the filler cap protector 5. It is comprised by. The double pipe method using a separate filler neck auxiliary body as in the prior art is not adopted. As a result, the assembly man-hours associated with the reduction in the number of parts can be reduced, which can contribute to weight reduction and cost reduction of the automobile.
　加えて、実施例７においても、フィラーチューブ２及びフィラーキャッププロテクター５は、共にフェライト系ステンレス鋼材を使用して構成されている。したがって、材料コストにおいても有利性を発揮することになる。 In addition, also in Example 7, the filler tube 2 and the filler cap protector 5 are both configured using a ferritic stainless steel material. Therefore, an advantage is also exhibited in the material cost.
　以上説明したこの発明に係る実施例１から７におけるフィラーチューブ２の孔開き腐食の防止機能を本願発明者達は確かめた。本願発明者達は、自動車が種々の使用環境地域において雨水または塩水などの大気腐食環境に晒されるものであると想定した。このような想定下で、鋼材が乾湿の繰り返しを受けたことによる腐食度を測定すべく、本願発明者達は、海水などにより塩害が比較的少ない所謂一般地域から海水などによる塩害が非常に過酷な環境地域としての所謂塩害過酷地域までを想定した。そして、このような想定下で、本願発明者達は、上記ＣＣＴサイクル試験を行って、耐酸素濃淡電池による電位差腐食効果を実験した。 The inventors of the present invention have confirmed the function of preventing perforation corrosion of the filler tube 2 in Examples 1 to 7 according to the present invention described above. The inventors of the present application assumed that automobiles are exposed to atmospheric corrosive environments such as rain water or salt water in various use environment areas. Under such assumption, in order to measure the degree of corrosion caused by repeated drying and wetting of steel materials, the inventors of the present application are very harsh from salt damage caused by seawater from so-called general areas where salt damage is relatively low due to seawater. We assumed even the so-called salt damage severe area as an environmental area. Under such assumptions, the inventors of the present application conducted the CCT cycle test and experimented on the potentiometric corrosion effect by the oxygen-resistant concentration cell.
　かかるＣＣＴサイクル試験は、鋼材においては、塩水噴霧、乾燥、湿潤、および外気導入を一サイクルとして、これを所定回数繰り返すことで行われた。かかる結果得られる腐食促進度合いとして、フィラーチューブ２の当初板厚に対する板厚残存率（％）を測定した。 Such a CCT cycle test was performed by repeating salt spraying, drying, wetting, and introduction of outside air as a cycle for steel materials a predetermined number of times. As the degree of corrosion promotion obtained as a result, the thickness remaining ratio (%) with respect to the initial thickness of the filler tube 2 was measured.
　そして、本願発明者達は、上記ＣＣＴサイクル試験について、フィラーチューブ２を構成する「SUS４３６材」及び「SUS４３９材」は、互いに電位差が同等であるということから、両材料のうち、「SUS４３９材」を試験材料として選択し、また、フィラーキャッププロテクター５を構成する材料として、「SUS４０９材」又は「SUS４０９ＡＬ材」を試験材料として選択した。 Then, the inventors of the present application, regarding the above CCT cycle test, “SUS436 material” and “SUS439 material” constituting the filler tube 2 have the same potential difference from each other. Was selected as a test material, and “SUS409 material” or “SUS409AL material” was selected as a test material as a material constituting the filler cap protector 5.
　このような条件の下で行われたＣＣＴサイクル試験によって、図７に示す試験結果を得た。図７においては、横軸は、「海水などにより塩害が比較的少ない所謂一般地域」から、「海水などによる塩害が非常に過酷な環境地域としての所謂塩害地域」を想定して設定したサイクル数を示している。縦軸は、フィラーチューブ２及びフィラーキャッププロテクター５を構成する各材料に対するフィラーチューブ２の腐食度合いとしての板厚残存率を示している。 The test results shown in FIG. 7 were obtained by the CCT cycle test performed under such conditions. In FIG. 7, the horizontal axis represents the number of cycles set on the assumption of “a so-called salt damage area as an environmental area where salt damage due to sea water etc. is extremely severe” from “a so-called general area where salt damage due to sea water is relatively small”. Is shown. The vertical axis represents the sheet thickness remaining rate as the degree of corrosion of the filler tube 2 with respect to each material constituting the filler tube 2 and the filler cap protector 5.
　かかる図７によれば、フィラーチューブ２及びフィラーキャッププロテクター５について、共に「SUS４０９材」を使用して構成した場合には、フィラーチューブ２の板厚残存率は、中間サイクル数である１６０サイクルにおいて８０％である。所謂塩害地域に相当するサイクル数である３００サイクルに至った場合には、フィラーチューブ２の板厚残存率は、４０％であるが、未だ、孔開き腐食が起きるまでに至っていない。 According to FIG. 7, when both the filler tube 2 and the filler cap protector 5 are configured using “SUS409 material”, the plate thickness remaining rate of the filler tube 2 is 160 cycles, which is the number of intermediate cycles. 80%. When the number of cycles corresponding to a so-called salt damage area reaches 300 cycles, the residual thickness ratio of the filler tube 2 is 40%, but the perforation corrosion has not yet occurred.
　これに対して、上記実施例２のように、フィラーチューブ２を「SUS４３９材」により構成する。一方、フィラーキャッププロテクター５を「SUS４０９材」により構成する。この場合には、フィラーチューブ２の板厚残存率は、中間サイクル数である１６０サイクルにおいて１００％である。所謂塩害地域に相当するサイクル数である３００サイクルに至った場合であっても、フィラーチューブ２の板厚残存率は、８０％である。 On the other hand, the filler tube 2 is made of “SUS439 material” as in the second embodiment. On the other hand, the filler cap protector 5 is made of “SUS409 material”. In this case, the plate thickness remaining rate of the filler tube 2 is 100% at 160 cycles which is the number of intermediate cycles. Even when the number of cycles corresponding to a so-called salt damage area reaches 300 cycles, the plate thickness remaining rate of the filler tube 2 is 80%.
　このことは、フィラーチューブ２とフィラーキャッププロテクター５との間で、少なくとも、微小の電位差があれば、フィラーキャッププロテクター５側の犠牲防食効果によって、フィラーチューブ２側の孔開き腐食の防止が可能であることを示していることになる。 This means that if there is at least a small potential difference between the filler tube 2 and the filler cap protector 5, the sacrificial anticorrosive effect on the filler cap protector 5 side can prevent the perforation corrosion on the filler tube 2 side. It shows that there is.
　また、上記実施例５のように、フィラーチューブ２は「SUS４３９材」により構成する。一方、フィラーキャッププロテクター５は「SUS４０９ＡＬ材」により構成する。この場合には、フィラーチューブ２の板厚残存率は、全サイクル数において１００％である。 Also, as in Example 5 above, the filler tube 2 is made of “SUS439 material”. On the other hand, the filler cap protector 5 is made of “SUS409AL material”. In this case, the plate thickness remaining rate of the filler tube 2 is 100% in the total number of cycles.
　このことは、フィラーチューブ２とフィラーキャッププロテクター５との間においてアルミメッキ層９が介在することによる大きな電位差が生じることから、アルミメッキ層９が犠牲防食効果を発揮して、フィラーチューブ２側の孔開き腐食の防止が可能であることを示していることになる。 This is because a large potential difference occurs due to the presence of the aluminum plating layer 9 between the filler tube 2 and the filler cap protector 5, and therefore the aluminum plating layer 9 exhibits a sacrificial anticorrosive effect, This indicates that it is possible to prevent perforation corrosion.
　また、たとえ「SUS４０９ＡＬ材」を構成するフィラーキャッププロテクター５のアルミメッキ層９が腐食し切ったとしても、フィラーキャッププロテクター５は、「SUS４０９材」により構成されている上記実施例２の場合と同等であることから、「SUS４３９材」によって構成されるフィラーチューブ２に対して、微小たりとも電位が低くなる。これにより、犠牲防食効果を発揮して、フィラーチューブ２側の孔開き腐食防止機能を果たすことができる。 Moreover, even if the aluminum plating layer 9 of the filler cap protector 5 constituting the “SUS409AL material” is completely corroded, the filler cap protector 5 is equivalent to the case of the above-described embodiment 2 constituted by the “SUS409 material”. Therefore, even if it is very small, the potential is low with respect to the filler tube 2 made of “SUS439 material”. Thereby, the sacrificial anticorrosion effect can be exhibited and the function of preventing perforation corrosion on the filler tube 2 side can be achieved.
　以上説明した試験結果から、次のようなことも考えられる。すなわち、実施例１における「SUS４３６材」で構成されるフィラーチューブ２に対して、「SUS４０９材」で構成されるフィラーキャッププロテクター５は、電位差が微小たりともある。これにより、犠牲防食効果を発揮して、フィラーチューブ２側の孔開き腐食防止機能を果たすことができるものと考えられる。 From the test results described above, the following may be considered. That is, the filler cap protector 5 made of “SUS409 material” may have a small potential difference with respect to the filler tube 2 made of “SUS436 material” in the first embodiment. Thereby, it is considered that the sacrificial anticorrosive effect can be exhibited and the function of preventing perforation corrosion on the filler tube 2 side can be achieved.
　また、実施例３のように「SUS４３６材」でフィラーチューブ２を構成し、「SUS４０９ＡＬ材」でフィラーキャッププロテクター５を構成する場合においても、フィラーキャッププロテクター５は、電位が低いことから犠牲防食効果を発揮して、フィラーチューブ２側の孔開き防止機能を果すことができる。もしも、フィラーキャッププロテクター５のアルミメッキ層９が腐食し切ったとしても、フィラーキャッププロテクター５は、基材が「SUS４０９材」により構成されている場合と同等であることから、「SUS４３９材」で構成されるフィラーチューブ２に対して、電位が低くなる。よって、犠牲防食効果を発揮して、フィラーチューブ２側の孔開き腐食防止機能を果たすことができるものと考えられる。 In addition, even when the filler tube 2 is composed of “SUS436 material” and the filler cap protector 5 is composed of “SUS409AL material” as in Example 3, the filler cap protector 5 has a sacrificial anticorrosion effect because the potential is low. And the function of preventing the opening of the filler tube 2 can be achieved. Even if the aluminum plating layer 9 of the filler cap protector 5 is completely corroded, the filler cap protector 5 is equivalent to the case where the base material is made of “SUS409 material”. The potential is lower with respect to the filler tube 2 configured. Therefore, it is considered that the sacrificial anticorrosive effect can be exhibited and the function of preventing perforation corrosion on the filler tube 2 side can be achieved.
　更に、実施例４のように「SUS４３６材」でフィラーチューブ２を構成し、「SUS４３９ＡＬ材」でフィラーキャッププロテクター５を構成する場合、実施例６のように「SUS４３９材」でフィラーチューブ２を構成し、「SUS４３９ＡＬ材」でフィラーキャッププロテクター５を構成する場合、或いは、実施例７のように「SUS４３６材」でフィラーチューブ２を構成し、「SUS４３６ＡＬ材」でフィラーキャッププロテクター５を構成する場合においては、フィラーチューブ２とフィラーキャッププロテクター５との間にアルミメッキ層９が介在することによる大きな電位差がある。これにより、アルミメッキ層９の犠牲防食効果によって、フィラーチューブ２側の孔開き腐食の防止ができるものと考えられる。 Furthermore, when the filler tube 2 is composed of “SUS436 material” as in Example 4 and the filler cap protector 5 is composed of “SUS439AL material”, the filler tube 2 is composed of “SUS439 material” as in Example 6. When the filler cap protector 5 is composed of “SUS439AL material”, or when the filler tube 2 is composed of “SUS436 material” and the filler cap protector 5 is composed of “SUS436AL material” as in the seventh embodiment. Has a large potential difference due to the presence of the aluminum plating layer 9 between the filler tube 2 and the filler cap protector 5. Thereby, it is considered that perforation corrosion on the filler tube 2 side can be prevented by the sacrificial anticorrosive effect of the aluminum plating layer 9.
　以上説明したこの発明の実施例によれば、フィラーチューブは、従来のような二重管方式を採らずにフィラーチューブ本体部とフィラーネック部とを一体形成することにより構成される。フィラーチューブとして、材料コストの有利なフェライト系ステンレス鋼材を使用したとしても、フィラーチューブ側の発錆を抑止できる。結果的にフィラーネック部における孔開き腐食の発生を確実に防止できる。また、部品点数の減数化に伴う組立工数を軽減させて、自動車の軽量化および低コスト化に寄与することができる。したがって、自動車などのエンジンの動力源としてのガソリン燃料或いは軽油燃料を貯蔵する燃料タンク内に燃料を給油するフィラーチューブ構造等に好適である。 According to the embodiment of the present invention described above, the filler tube is configured by integrally forming the filler tube main body portion and the filler neck portion without adopting the conventional double tube method. Even if a ferritic stainless steel material having an advantageous material cost is used as the filler tube, rusting on the filler tube side can be suppressed. As a result, the occurrence of perforation corrosion at the filler neck can be reliably prevented. Further, it is possible to reduce the assembly man-hours associated with the reduction in the number of parts, thereby contributing to weight reduction and cost reduction of the automobile. Therefore, it is suitable for a filler tube structure for supplying fuel into a fuel tank for storing gasoline fuel or light oil fuel as a power source of an engine such as an automobile.
　　１　　燃料タンク
　　２　　フィラーチューブ
　　３　　フィラーチューブ本体部
　　４　　フィラーネック部
　　４ａ　フィラーネック部側嵌合部
　　５　　フィラーキャッププロテクター
　　５ａ　フィラーキャッププロテクター側嵌合部
　　７　　車体パネル
　　８　　嵌合部
　　９　　アルミメッキ層 DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Filler tube 3 Filler tube main-body part 4 Filler neck part 4a Filler neck part side fitting part 5 Filler cap protector 5a Filler cap protector side fitting part 7 Body panel 8 Fitting part 9 Aluminum plating layer

Claims (8)

  1. 　燃料タンクに用いられるフィラーチューブ構造であって、
    　一端側が燃料タンク側に接続されるフィラーチューブ本体部と、前記フィラーチューブ本体部の他端側に一体形成され先端部が給油口部として構成されるフィラーネック部とにより構成されるフィラーチューブを備え、
    　前記フィラーネック部は、一端側が車体パネルに取り付けられるフィラーキャッププロテクターの他端側に嵌合されており、
    　前記フィラーネック部は、前記フィラーキャッププロテクターと前記フィラーネック部との嵌合部が溶着されることにより、前記フィラーキャッププロテクターに取り付けられ、
    　前記フィラーチューブ及び前記フィラーキャッププロテクターが共に、フェライト系ステンレス鋼材により構成され、
    　前記フィラーキャッププロテクターが、前記フィラーチューブの電位に対して、低い電位を有する、フィラーチューブ構造。     A filler tube structure used for a fuel tank,
    Provided with a filler tube composed of a filler tube main body portion whose one end is connected to the fuel tank side, and a filler neck portion integrally formed on the other end side of the filler tube main body portion and having a tip portion serving as a fuel filler port portion. ,
    The filler neck part is fitted to the other end side of the filler cap protector attached to the vehicle body panel at one end side,
    The filler neck part is attached to the filler cap protector by welding a fitting part between the filler cap protector and the filler neck part,
    Both the filler tube and the filler cap protector are made of a ferritic stainless steel material,
    The filler tube structure in which the filler cap protector has a low potential with respect to the potential of the filler tube.
  2. 　前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材、又は、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材を使用して構成し、
    　前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.030％、Ｓｉ：≦1.00％、Ｍｎ：≦1.00％、Ｐ：≦0.04％、Ｓ：≦0.030％、Ｃｒ：10.50～11.45％、Ｔｉ：10（Ｃ＋Ｎ）～0.75％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材を使用して構成する、請求項１に記載のフィラーチューブ構造。     The filler tube is, by mass%, C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Ti: 10 ( C + N) to 0.35%, N: ≦ 0.015%, the balance being ferritic stainless steel material consisting of inevitable impurities and Fe, or by mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≤0.040%, S: ≤0.006%, Cr: 17.00-18.00%, Mo: 1.00-1.50%, Ti: 10 (C + N) -0.35%, N: ≤ 0.015%, the balance Constructed using ferritic stainless steel material consisting of inevitable impurities and Fe,
    The filler cap protector is, in mass%, C: ≦ 0.030%, Si: ≦ 1.00%, Mn: ≦ 1.00%, P: ≦ 0.04%, S: ≦ 0.030%, Cr: 10.50 to 11.45%, Ti: 10 2. The filler tube structure according to claim 1, wherein the filler tube structure is made of a ferritic stainless steel material containing (C + N) to 0.75%, N: ≦ 0.015, and the balance consisting of inevitable impurities and Fe.
  3. 　前記フィラーネック部及び前記フィラーキャッププロテクターが、アルミメッキ層を介在させて、嵌合される、請求項１に記載のフィラーチューブ構造。 The filler tube structure according to claim 1, wherein the filler neck portion and the filler cap protector are fitted with an aluminum plating layer interposed therebetween.
  4. 　前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材を使用して構成し、
    　前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.030％、Ｓｉ：≦1.00％、Ｍｎ：≦1.00％、Ｐ：≦0.040％、Ｓ：≦0.030％、Ｃｒ：10.50～11.45％、Ｔｉ：10（Ｃ＋Ｎ）～0.75％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成り且つ表面に前記アルミメッキ層が形成されたフェライト系ステンレス鋼材を使用して構成する、請求項３に記載のフィラーチューブ構造。     The filler tube is, by mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Mo: 1.00 to 1. 50%, Ti: 10 (C + N) to 0.35%, N: ≤ 0.015%, the balance is composed using ferritic stainless steel made of unavoidable impurities and Fe,
    The filler cap protector is, in mass%, C: ≦ 0.030%, Si: ≦ 1.00%, Mn: ≦ 1.00%, P: ≦ 0.040%, S: ≦ 0.030%, Cr: 10.50 to 11.45%, Ti: 10 4. A ferritic stainless steel material comprising (C + N) ˜0.75%, N: ≦ 0.015, the balance being inevitable impurities and Fe, and having the aluminum plating layer formed on the surface is used. The filler tube structure described.
  5. 　前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材を使用して構成し、
    　前記フィラーキャッププロテクターを、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.04％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成り且つ表面に前記アルミメッキ層が形成されたフェライト系ステンレス鋼材を使用して構成する、請求項３に記載のフィラーチューブ構造。     The filler tube is, by mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Mo: 1.00 to 1. 50%, Ti: 10 (C + N) to 0.35%, N: ≤ 0.015%, the balance is composed using ferritic stainless steel made of unavoidable impurities and Fe,
    The filler cap protector comprises C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.04%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Ti: 10 (C + N) to The filler according to claim 3, comprising 0.35%, N: ≦ 0.015%, and a ferritic stainless steel material in which the balance is made of inevitable impurities and Fe, and the aluminum plating layer is formed on the surface. Tube structure.
  6. 　前記フィラーチューブを、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成ステンレス鋼材を使用して構成し、
    　前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.030％、Ｓｉ：≦1.00％、Ｍｎ：≦1.00％、Ｐ：≦0.04％、Ｓ：≦0.030％、Ｃｒ：10.50～11.45％、Ｔｉ：10（Ｃ＋Ｎ）～0.75％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成り且つ表面に前記アルミメッキ層が形成されたフェライト系ステンレス鋼材を使用して構成する、請求項３に記載のフィラーチューブ構造。     C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Ti: 10 (C + N) to 0.35 %, N: ≦ 0.015%, the balance is composed of inevitable impurities and Fe using a synthetic stainless steel material,
    The filler cap protector is, in mass%, C: ≦ 0.030%, Si: ≦ 1.00%, Mn: ≦ 1.00%, P: ≦ 0.04%, S: ≦ 0.030%, Cr: 10.50 to 11.45%, Ti: 10 4. A ferritic stainless steel material comprising (C + N) ˜0.75%, N: ≦ 0.015, the balance being inevitable impurities and Fe, and having the aluminum plating layer formed on the surface is used. The filler tube structure described.
  7. 　前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成るフェライト系ステンレス鋼材を使用して構成し、
    　前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦1.00％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015を含有し、残部が不可避的不純物及びＦｅから成り且つ表面に前記アルミメッキ層が形成されたフェライト系ステンレス鋼材を使用して構成する、請求項３に記載のフィラーチューブ構造。     The filler tube is, by mass%, C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Ti: 10 ( C + N) to 0.35%, N: ≦ 0.015 is contained, and the balance is configured using a ferritic stainless steel material composed of inevitable impurities and Fe.
    The filler cap protector is, in mass%, C: ≦ 0.010%, Si: ≦ 1.00%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Ti: 10 4. A ferritic stainless steel material containing (C + N) to 0.35%, N: ≦ 0.015, the balance being inevitable impurities and Fe, and having the aluminum plating layer formed on the surface is used. The filler tube structure described.
  8. 　前記フィラーチューブを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成るステンレス鋼材を使用して構成し、
    　前記フィラーキャッププロテクターを、質量％で、Ｃ：≦0.010％、Ｓｉ：≦0.14％、Ｍｎ：≦0.20％、Ｐ：≦0.040％、Ｓ：≦0.006％、Ｃｒ：17.00～18.00％、Ｍｏ：1.00～1.50％、Ｔｉ：10（Ｃ＋Ｎ）～0.35％、Ｎ：≦0.015％を含有し、残部が不可避的不純物及びＦｅから成り且つ表面に前記アルミメッキ層が形成されたフェライト系ステンレス鋼材を使用して構成する、請求項３に記載のフィラーチューブ構造。     The filler tube is, by mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Mo: 1.00 to 1.50%, Ti: 10 (C + N) to 0.35%, N: ≦ 0.015%, the balance is composed of stainless steel material consisting of inevitable impurities and Fe,
    The filler cap protector is, in mass%, C: ≦ 0.010%, Si: ≦ 0.14%, Mn: ≦ 0.20%, P: ≦ 0.040%, S: ≦ 0.006%, Cr: 17.00 to 18.00%, Mo: 1.00. Using ferritic stainless steel material containing ~ 1.50%, Ti: 10 (C + N) ~ 0.35%, N: ≤0.015%, the balance consisting of unavoidable impurities and Fe, and having the aluminum plating layer formed on the surface The filler tube structure according to claim 3 configured.
PCT/JP2017/002826 2016-06-24 2017-01-26 Filler tube structure WO2017221450A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0578867A (en) * 1991-09-25 1993-03-30 Nippon Metal Ind Co Ltd Method for proofing corrosion of base stainless steel
JP2011088527A (en) * 2009-10-22 2011-05-06 Suzuki Motor Corp Filler neck part structure of vehicle
JP2012091534A (en) * 2010-10-22 2012-05-17 Keylex Corp Fuel supply pipe
JP2012197071A (en) * 2010-12-21 2012-10-18 Nippon Steel & Sumikin Stainless Steel Corp Oil feed pipe, and method for producing same
WO2015037707A1 (en) * 2013-09-13 2015-03-19 新日鐵住金ステンレス株式会社 Inexpensive automotive member and feed oil pipe, exhibiting excellent salt corrosion resistance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0578867A (en) * 1991-09-25 1993-03-30 Nippon Metal Ind Co Ltd Method for proofing corrosion of base stainless steel
JP2011088527A (en) * 2009-10-22 2011-05-06 Suzuki Motor Corp Filler neck part structure of vehicle
JP2012091534A (en) * 2010-10-22 2012-05-17 Keylex Corp Fuel supply pipe
JP2012197071A (en) * 2010-12-21 2012-10-18 Nippon Steel & Sumikin Stainless Steel Corp Oil feed pipe, and method for producing same
WO2015037707A1 (en) * 2013-09-13 2015-03-19 新日鐵住金ステンレス株式会社 Inexpensive automotive member and feed oil pipe, exhibiting excellent salt corrosion resistance

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