Method of manufacturing high-pressure tank and high-pressure tank

Abstract

A high-pressure tank in a method of manufacturing a high-pressure tank includes a liner and a fiber. The manufacturing method includes: preparing a dome and a pipe each having a general portion and a joining end portion formed to be thicker than the general portion such that an outer diameter at least at an end face is larger than an outer diameter of the general portion by an estimated level difference amount; joining the joining end portion of the dome and the joining end portion of the pipe together in an axial direction; cutting off portions on the further outer side in a radial direction than a reference plane, with an outer peripheral surface of the general portion of the dome having a large outer diameter at the joined surface as the reference plane; and winding a carbon fiber around the outer peripheral surface of the liner in helical winding.

What is claimed is: 
     
         1 . A high-pressure tank comprising:
 a liner configured by joining a plurality of cylindrical liner constituent members together; and   a fiber wound around an outer periphery of the liner, wherein:   the liner includes cylindrical general portions, and a joined portion configured by joining joining end portions of the cylindrical liner constituent members together in an axial direction;   the joined portion includes a first joining end portion and a second joining end portion, of which outer diameters at a joined surface are equal to each other;   the first joining end portion has the same thickness as a thickness of the cylindrical general portion; and   the second joining end portion has a larger outer diameter than the cylindrical general portion and is thicker than the cylindrical general portion.   
     
     
         2 . The high-pressure tank according to  claim 1 , wherein the second joining end portion includes a tapered portion having an outer diameter that decreases with increasing distance in the axial direction from the joined surface. 
     
     
         3 . The high-pressure tank according to  claim 2 , wherein an inclined surface of the tapered portion is stepped down to an outer peripheral surface of the cylindrical general portion before the inclined surface intersects the outer peripheral surface.