IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0384670
(2003-03-11)
|
우선권정보 |
JP-0206132 (2002-07-15); JP-0071296 (2002-03-15) |
발명자
/ 주소 |
- Morohoshi, Katsumi
- Kumagai, Hiroshi
- Honma, Masami
- Satou, Tomoyuki
- Yamada, Mitsuo
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
12 |
초록
▼
A welded structure constituted of a fuel filling container having an opening, and a welded part including a pipe-shaped section whose one end is disposed in the opening of the fuel filling container. A welding section is fixedly disposed around the outer periphery of the pipe-shaped section. The wel
A welded structure constituted of a fuel filling container having an opening, and a welded part including a pipe-shaped section whose one end is disposed in the opening of the fuel filling container. A welding section is fixedly disposed around the outer periphery of the pipe-shaped section. The welding section is welded through a welding surface to the outer surface of the fuel filling container. In the welded structure, the welding section of the welded part includes a welding strength providing layer and a fuel permeation resistance layer which are coaxial with the pipe-shaped section of the welded part and radially laminated to define the annular welding surface. Additionally, at least an inner peripheral surface portion of the pipe-shaped section and an outer peripheral surface portion of the other end portion of the pipe-shaped section are formed of a fuel permeation resisting material.
대표청구항
▼
1. A welded structure, comprising:a fuel filling container having a section defining an opening; and a welded part including a pipe-shaped section which has a first end portion disposed in the opening of the fuel filling container, and an annular welding section fixedly disposed around the outer per
1. A welded structure, comprising:a fuel filling container having a section defining an opening; and a welded part including a pipe-shaped section which has a first end portion disposed in the opening of the fuel filling container, and an annular welding section fixedly disposed around the outer periphery of the pipe-shaped section, the welding section being welded through an annular welding surface to an outer surface of the fuel filling container at a section surrounding the opening of the fuel filling container, wherein the welding section of the welded part includes an annular welding strength providing layer and an annular fuel permeation resistance layer which are coaxial with the pipe-shaped section of the welded part and radially laminated to define the annular welding surface, wherein at least an inner peripheral surface portion of the pipe-shaped section and an outer peripheral surface portion of a second end portion of the pipe-shaped section are formed of a fuel permeation resisting material, such that a joined part may be connected to the second end portion of the pipe-shaped section, wherein the welding strength providing layer of the welding section of the welded part is formed of polyethylene, and the fuel permeation resistance layer of the welding section and the fuel permeation resisting material of the pipe-shaped section of the welded part are formed of a blend resin made of a polyethylene containing 20 to 80% by volume of at least one selected from the group consisting of polyamide, ethylene-vinyl alcohol copolymer, polyacetal and polyester. 2. A welded structure as claimed in claim 1, wherein the polyethylene forming the welding strength providing layer is modified polyethylene which has been modified by introducing maleic anhydride group into polyethylene, wherein the modified polyethylene has an infrared absorbance Z represented by Eq. (1), within a range of from more than 0 to not more than 0.8 and a density ranging from 925 to 950 kg/m3:Z=I1792/I4250+I1700/I4250??Eq. (1) where I1792, I4250, I1700 and I4250 are respectively the peak heights of infrared absorption spectrums at wave numbers 1792, 4250, 1700 and 4250 cm?1. 3. A welded structure as claimed in claim 1, wherein the fuel permeation resistance layer of the welding section of the welded part is formed of a blend resin made of polyethylene containing 20 to 80% by volume of at least one selected from the group consisting of polyamide and ethylene-vinyl alcohol copolymer, and the fuel permeation resisting material of the pipe-shaped section of the welded part is one of polyamide and polyamide reinforced with glass fiber.4. A welded structure as claimed in claim 1, wherein the fuel permeation resistance layer of the welding section of the welded part is formed of a blend resin made of polyethylene containing 20 to 80% by volume of polyacetal, and the fuel permeation resisting material of the pipe-shaped section of the welded part is one of polyacetal and polyacetal reinforced with glass fiber.5. A welded structure as claimed in claim 1, wherein the fuel permeation resistance layer of the welding section of the welded part is formed of a blend resin made of polyethylene containing 20 to 80% by volume of polyester, and the fuel permeation resisting material of the pipe-shaped section of the welded part is one of polyester and polyester reinforced with glass fiber.6. A welded structure as claimed in claim 1, wherein the inner peripheral surface portion and the outer peripheral surface portion of the second end portion of the pipe-shaped section of the welded part is formed of a material for providing a welding strength.7. A welded structure as claimed in claim 1, wherein the fuel filling container has a wall comprising a plurality of layers including at least one fuel permeation resistance layer, the opening being formed piercing the wall, wherein the fuel permeation resistance layer of the welding section of the welded part extends into the opening of the fuel filling container to cover a range from the outer surface of the fuel filling container to at lest one of the fuel permeation resistance layer.8. A welded structure as claimed in claim 1, wherein the second end portion of the pipe-shaped section of the welded part is formed at its outer peripheral surface with a projection to which a joined part is to be joined.9. A welded structure as claimed in claim 1, wherein the fuel permeation resistance layer is located radially inward of the welding strength providing layer.10. A welded structure as claimed in claim 1, further comprising a joined part jointed to the second end portion of the pipe-shaped section of the welded part, the first end portion of the pipe-shaped section being connected to the fuel filling container, wherein a surface of a part of the pipe-shaped section located between the joined part and the welding section is covered with a material for providing a welding strength.11. A welded structure as claimed in claim 1, wherein the polyethylene is one of high density polyethylene and polyethylene modified with maleic anhydride.12. A welded structure as claimed in claim 7, wherein the fuel filling container wall comprises a plurality of fuel permeation resistance layers and wherein the fuel permeation resistance layer of the welding section of the welded part extends into the opening of the fuel filling container to cover a range from the outer surface of the fuel filling container to the fuel permeation resistance layer which is located nearest the outer surface of the fuel filling container with respect to the other fuel permeation resistance layer or layers.13. A method of welding a welding part to a fuel filling container, the welding part including a pipe-shaped section, the fuel filling container being formed with an opening, the method comprising:forming an annular welding section having an annular welding surface facing an outer surface of the fuel filling container, fixedly around an outer periphery of the pipe-shaped section, the welding section including an annular welding strength providing layer, and an annular fuel permeation resistance layer which are coaxial with the pipe-shaped section of the welded part and radially laminated to define the annular welding surface; forming at least an inner peripheral surface portion of the pipe-shaped section and an outer peripheral surface portion of a first end portion of the pipe-shaped section, of a fuel permeation resisting material, a joined part being to be connected to the first end portion; disposing a second end portion of the pipe-shaped section of the welded part in the opening of the fuel filling container; and welding the welding section of the welded part through the welding surface to the outer surface of the fuel filling container at a section around the opening; wherein the forming the annular welding section includes forming one layer selected from the group consisting of the welding strength providing layer and the fuel permeation resistance layer in a manner to project toward the outer surface of the fuel filling container relative to the other layer, the one layer being formed of a first synthetic resin, the other layer being formed of a second synthetic resin which is lower in viscosity than the first synthetic resin, wherein the welding section of the welded part is welded through the welding surface to the outer surface of the fuel filling container at the part around the opening after the forming of the one layer; and wherein a height difference ranging from 0.5 mm to 2 mm is formed between a first surface of the one layer and a second surface of the other layer, the first and second layer corresponding to the welding surface. 14. A method of welding a welding part to a fuel filling container, the welding part including a pipe-shaped section, the fuel filling container being formed with an opening, the method comprising:forming an annular welding section having an annular welding surface facing an outer surface of the fuel filling container, fixedly around an outer periphery of the pipe-shaped section, the welding section including an annular welding strength providing layer, and an annular fuel permeation resistance layer which are coaxial with the pipe-shaped section of the welded part and radially laminated to define the annular welding surface; forming at least an inner peripheral surface portion of the pipe-shaped section and an outer peripheral surface portion of a first end portion of the pipe-shaped section, of a fuel permeation resisting material, a joined part being to be connected to the first end portion; disposing a second end portion of the pipe-shaped section of the welded part in the opening of the fuel filling container; and welding the welding section of the welded part through the welding surface to the outer surface of the fuel filling container at a section around the opening; wherein the forming of the annular welding section includes forming an annular groove between the welding strength providing layer and the fuel permeation resistance layer, at the welding surface facing the outer surface of the fuel filling container; and wherein the groove has a width ranging from not less than 0.5 mm to not more than 2 mm, and a depth ranging from not less than 0.5 mm to not more than 2 mm.
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