Abstract: Provided is a method that is for attaching a filler pipe. The method for attaching a filler pipe attaches a filler pipe to the aperture of a fuel tank with an attachment member therebetween, and is characterized by containing: a fitting step for fitting the tubular attachment member to the inside of the aperture of the filler pipe; a contact step for contacting, to the surface at the periphery of the aperture of the fuel tank, a first flange protruding outwards in the radial direction from the outer peripheral surface of the attachment member, and a second flange protruding outwards in the radial direction from the outer peripheral surface of the filler pipe; and a welding step for welding the first flange and second flange to the surface.

Abstract: The present invention provides a mounting structure for an integrated component to be mounted by snap-fitting on a fuel tank so that it is possible to suppress looseness. This mounting structure for an integrated component of a fuel tank includes: a weld clip which has a tip part having an engaging portion and a base end part to be welded to an inner surface of the fuel tank; an engagement base which is provided to the integrated component to be integrated into the fuel tank, and has a snap-fitting arm to be engaged with the engaging portion by elastic restoring force; and a lock member which is attached to the engagement base so as to be capable of switching from a temporary holding position to a lock position, the temporary holding position allowing an elastic deformation of the snap-fitting arm in a direction to release the engagement with the engaging portion, the lock position preventing the elastic deformation.

Abstract: The present invention provides a mounting structure for an integrated component to be mounted by snap-fitting on a fuel tank so that it is possible to suppress looseness. This mounting structure for an integrated component of a fuel tank includes: a weld clip which has a tip part having an engaging portion and a base end part to be welded to an inner surface of the fuel tank; an engagement base which is provided to the integrated component to be integrated into the fuel tank, and has a snap-fitting arm to be engaged with the engaging portion by elastic restoring force; and a lock member which is attached to the engagement base so as to be capable of switching from a temporary holding position to a lock position, the temporary holding position allowing an elastic deformation of the snap-fitting arm in a direction to release the engagement with the engaging portion, the lock position preventing the elastic deformation.

Abstract: A fuel tank has a welded member that is welded inside a fuel tank body. The welded member includes a welded face that is welded on at least one of a first tank face and a second tank face which faces the first tank face, of the fuel tank body, and wherein the welded face includes a facing side in a concave shape that faces a given point determined based on a displacement of distance between the first tank face and the second tank face when the fuel tank body receives an internal pressure.

Abstract: A fuel tank has a welded member that is welded inside a fuel tank body. The welded member includes a welded face that is welded on at least one of a first tank face and a second tank face which faces the first tank face, of the fuel tank body, and wherein the welded face includes a facing side in a concave shape that faces a given point determined based on a displacement of distance between the first tank face and the second tank face when the fuel tank body receives an internal pressure.

Abstract: A wave-eliminating plate securing structure in a fuel tank 1 includes: a wave-eliminating plate configured to be fixed to an inside of a resinous fuel tank and to suppress waving of fuel; and resinous clips each including a weld portion to be welded and fixed to an inner wall of the fuel tank, and an attachment portion to which to attach the wave-eliminating plate. After the clips are welded and fixed at their respective predetermined positions to an inner wall of the fuel tank in advance, the wave-eliminating plate may be inserted into the fuel tank, and attached and fixed to the clips. Thereby, the wave-eliminating plate can be easily fixed at a predetermined position to the inside of the fuel tank with high precision.

Abstract: A wave-eliminating plate securing structure in a fuel tank 1 includes: a wave-eliminating plate configured to be fixed to an inside of a resinous fuel tank and to suppress waving of fuel; and resinous clips each including a weld portion to be welded and fixed to an inner wall of the fuel tank, and an attachment portion to which to attach the wave-eliminating plate. After the clips are welded and fixed at their respective predetermined positions to an inner wall of the fuel tank in advance, the wave-eliminating plate may be inserted into the fuel tank, and attached and fixed to the clips. Thereby, the wave-eliminating plate can be easily fixed at a predetermined position to the inside of the fuel tank with high precision.

Abstract: Provided is a method that is for attaching a filler pipe and that can reduce the amount of transmission of a hydrocarbon and can attach easily. The method for attaching a filler pipe attaches a filler pipe to the aperture of a fuel tank with an attachment member therebetween, and is characterized by containing: a fitting step for fitting the tubular attachment member to the inside of the aperture of the filler pipe; a contact step for contacting, to the surface at the periphery of the aperture of the fuel tank, a first flange protruding outwards in the radial direction from the outer peripheral surface of the attachment member, and a second flange protruding outwards in the radial direction from the outer peripheral surface of the filler pipe; and a welding step for welding the first flange and second flange to the surface.

Abstract: In welding a component part (20) to a tank main body (10) of a plastic fuel tank of a laminated structure, an annular upright wall (15) is formed in a tank main body wall so as to define an opening therein. An end surface of a weldable layer of the component part is welded to an outer surface of a weldable layer of the tank main body surrounding the annular upright wall to form a first welded part (31) and to an end surface of the weldable layer of the tank main body exposed at the top surface of the annular upright wall to form a second welded part (32) while the HC barrier layers (12, 24) are kept substantially aligned with each other at the interface between the two parts. Thereby, the required HC permeation blocking property and an adequate welding strength can be achieved at the same time.

Abstract: In welding a component part (20) to a tank main body (10) of a plastic fuel tank of a laminated structure, an annular upright wall (15) is formed in a tank main body wall so as to define an opening therein. An end surface of a weldable layer of the component part is welded to an outer surface of a weldable layer of the tank main body surrounding the annular upright wall to form a first welded part (31) and to an end surface of the weldable layer of the tank main body exposed at the top surface of the annular upright wall to form a second welded part (32) while the HC barrier layers (12, 24) are kept substantially aligned with each other at the interface between the two parts. Thereby, the required HC permeation blocking property and an adequate welding strength can be achieved at the same time.