A surface-treated steel sheet for fuel tanks, including a ZnNi alloy plating layer on one surface or both surfaces of a steel sheet; and a trivalent chromate covering layer or a chromate-free covering layer on the ZnNi alloy plating layer, wherein, in a surface outermost layer of the trivalent chromate covering layer or the chromate-free covering layer, concavities, of which a depth from an arithmetic average height of a cross-sectional curve of the surface outermost layer is more than or equal to 0.1 m, exist in a proportion of 50 to 1000 concavities/mm2 and at an area ratio of 20 to 80% to a surface area of the steel sheet.

A resin-made fuel tank includes: a resin-made fuel tank main body provided by joining an upper half and a lower half; a barrier sheet layer that is provided on an inner surface of the fuel tank main body and that reduces permeation of a fuel from the fuel tank main body; and a front mounting stay and rear mounting stays for mounting the fuel tank main body to a vehicle body. The front mounting stay and the rear mounting stays are provided on the fuel tank main body at positions vertically spaced from an upper joint surface and a lower joint surface at which the upper half and the lower half re joined to each other.

A high-pressure tank includes a liner for storing a fluid, and a reinforcing layer covering an outer surface of the liner and including a fiber wound around the liner and a resin. The reinforcing layer includes a helical layer group including laminated helical layers, and a large-angle layer provided adjacent to the helical layer group and on the liner-side. The helical layer group includes an innermost layer that is closest to the liner and that is one of first and second helical layers respectively having the largest and second largest fiber winding angles, an outermost layer that is closest to an outer surface of the high-pressure tank and that is the other one of the first and second helical layers, and an intermediate layer disposed between the innermost and outermost layers and including a helical layer that is smaller in winding angle than the innermost and outermost layers.

The invention relates to a fuel tank (10) having at least two layers (12) stacked one on top of the other, wherein the layers (12) each have a plurality of single tanks (14) lined together. The invention further relates to a vehicle (100) having the fuel tank (10).

A tank including a liner; a reinforcing layer formed of fiber reinforced resin that is arranged on the liner; a label arranged on the reinforcing layer; and a surface layer formed of glass fiber reinforced resin that is arranged to cover the label. The reinforcing layer includes an inner layer, and an outer layer having a cover rate smaller than the inner layer and smaller than 100%, the cover rate being a percentage of a volume occupied by the fiber reinforced resin in space of the reinforcing layer, and the outer layer being arranged on the inner layer, and at least a part of the label is embedded in the reinforcing layer.

An injection-molding method for manufacturing a half-shell of a liquid container for a motor vehicle, comprising the following steps: providing a barrier film in a cavity of an injection-molding tool, the cavity being provided for the purpose of shaping the half-shell; providing a barrier sleeve in the cavity; injecting plasticized injection-molding material into the cavity, wherein plasticized injection-molding material is sprayed onto the barrier film and/or the barrier film is back-injected with plasticized injection-molding material; and wherein the barrier sleeve is back-injected with plasticized injection-molding material and/or overmolded with plasticized injection-molding material to form a connection element of the half-shell.

A liquid container for a motor vehicle, having a first half-shell and a second half-shell, the half-shells delimiting a storage volume for accommodating liquid, the first half-shell having a first support layerand a first barrier layer, the second half-shell having a second support layerand a second barrier layer, the first barrier being situated on a side of the first support layer facing the storage volume, and the second barrier layer being situated on a side of the second support layer facing the storage volume.

A method for manufacturing a high-pressure tank, capable of removing bubbles inside a carbon-fiber layer and those on an outer surface thereof without deteriorating a strength of the carbon-fiber layer, preventing a defective appearance, reducing variations in size, and thereby manufacturing a high-pressure tank having an excellent strength is provided. A method for manufacturing a high-pressure tank includes an uncured carbon-fiber layer forming step of forming an uncured carbon-fiber layer around a liner, a glass-fiber layer forming step of forming an uncured glass-fiber layer around the uncured carbon-fiber layer, a pin inserting step of inserting a tubular pin disposed therein from an uncured glass-fiber layer side to an interface of the uncured carbon-fiber layer, a gas sucking step of sucking a gas from the pin, and a thermally-curing treatment step of forming a glass-fiber layer and a carbon-fiber layer.

A method of manufacturing a high-pressure tank includes: forming a vessel body including a body portion having a cylindrical shape, a domical portion having a hemispherical shape and provided at an end of the body portion, and a neck portion extending from the domical portion in an axial direction of the domical portion; winding fibers around an outer peripheral surface of the vessel body to form a plurality of fiber layers laminated in a radial direction of the vessel body; and placing, in a mold, the vessel body around which the fibers have been wound, and then injecting a resin onto the neck portion in an axial direction of the vessel body to impregnate the fibers with the resin.

A plastic tank having a connection device for the plastic tank. The connection device includes a connection nipple, composed of a low-emission material, which is to be inserted into or attached to, from the outside, an opening of a tank wall of the plastic tank. A counter-piece is arranged to lay flat against the inside of the tank wall around the opening. The connection nipple is connected by screw connection or clip connection to the counter-piece. A seal is arranged around the opening between the outside of the tank wall and a sealing face of the connection nipple that faces the outside of the tank wall.