초록 ▼

A fuel tank in which at least a part of a fuel storing unit is formed of a flexible film is provided with a main chamber having a variable volume by deforming according to a storing amount of a fuel, a sub-chamber having a volume which is kept substantially constant, and a fuel pump housed inside th

A fuel tank in which at least a part of a fuel storing unit is formed of a flexible film is provided with a main chamber having a variable volume by deforming according to a storing amount of a fuel, a sub-chamber having a volume which is kept substantially constant, and a fuel pump housed inside the sub-chamber. The main chamber and the sub-chamber are integrally formed to form the fuel storing unit.

대표청구항 ▼

What is claimed is: 1. A fuel tank comprising: a fuel storing unit including: a main chamber having a variable volume by deforming according to a storing amount of a fuel; a sub-chamber having a volume which is kept substantially constant; a fuel pump housed inside the sub-chamber, wherein the main

What is claimed is: 1. A fuel tank comprising: a fuel storing unit including: a main chamber having a variable volume by deforming according to a storing amount of a fuel; a sub-chamber having a volume which is kept substantially constant; a fuel pump housed inside the sub-chamber, wherein the main chamber and the sub-chamber are integrally formed to form the fuel storing unit, the main chamber and the sub-chamber share a contiguous upper wall formed of an upper flexible film, and the main chamber and the sub-chamber share a contiguous lower wall formed of a lower flexible film. 2. The fuel tank according to claim 1, further comprising: a deformation preventing member for suppressing a deformation of the sub-chamber. 3. The fuel tank according to claim 1, further comprising: a liquid-level gauge housed inside the sub-chamber. 4. The fuel tank according to claim 1, wherein an upper surface of the main chamber is tilted so that a sub-chamber side thereof becomes higher, and a lower surface of the main chamber is tilted so that the sub-chamber side thereof becomes lower. 5. The fuel tank according to claim 1, wherein a filler tube for supplying a fuel into the fuel storing unit is communicated with the sub-chamber. 6. The fuel tank according to claim 1, further comprising: a housing provided in the sub-chamber, the fuel pump being housed inside the housing, wherein the sub-chamber has an opening through which the housing can be inserted. 7. The fuel tank according to claim 1, further comprising: a support rubber disposed under a lower surface of the sub-chamber. 8. The fuel tank according to claim 1, wherein each of the upper and lower flexible films includes an ethylene-vinyl alcohol copolymer resin layer. 9. The fuel tank according to claim 2, wherein a depression portion is formed in a boundary area between the main chamber and the sub-chamber, and the deformation preventing member comes into contact with the depression portion. 10. The fuel tank according to claim 1, wherein the volume of the main chamber varies in accordance with deformation of the upper and lower flexible films. 11. The fuel tank according to claim 1, wherein the upper wall and the lower wall face with each other. 12. The fuel tank according to claim 6, further comprising: a cap; and a lid plate having a lower surface to which the housing is attached, wherein the cap fixes the lid plate at an opening of the sub-chamber. 13. A fuel tank comprising: a fuel storing unit, at least a part of which is formed of a flexible film, including: a main chamber having a variable volume by deforming according to a storing amount of a fuel; a sub-chamber having a volume which is kept substantially constant; and a fuel pump housed inside the sub-chamber, wherein the main chamber and the sub-chamber are integrally formed to form the fuel storing unit, an upper surface of the main chamber is tilted so that a sub-chamber side thereof becomes higher, and a lower surface of the main chamber is tilted so that the sub-chamber side thereof becomes lower. 14. A fuel tank comprising: a fuel storing unit, at least a part of which is formed of a flexible film, including: a main chamber having a variable volume by deforming according to a storing amount of a fuel; a sub-chamber having a volume which is kept substantially constant; and a fuel pump housed inside the sub-chamber, a deformation preventing member for suppressing a deformation of the sub-chamber, wherein the main chamber and the sub-chamber are integrally formed to form the fuel storing unit, a depression portion is formed in a boundary area between the main chamber and the sub-chamber, and the deformation preventing member comes into contact with the depression portion.