High-pressure tank, method for manufacturing high-pressure tank, and method for manufacturing fiber-reinforced resin layer for high-pressure tank

Abstract

A method for manufacturing a high-pressure tank including a liner and a fiber-reinforced resin layer, the fiber-reinforced resin layer having a first reinforcing layer covering an outer surface of the liner and a second reinforcing layer covering an outer surface of the first reinforcing layer includes: forming a cylinder member made of a fiber-reinforced resin and having fibers oriented in a circumferential direction of the cylinder member; forming two dome members made of the fiber-reinforced resin; forming a reinforcing body that is the first reinforcing layer by joining the cylinder member and the dome members; and forming on an outer surface of the reinforcing body the second reinforcing layer made of the fiber-reinforced resin and having fibers oriented across the dome members.

What is claimed is: 
     
         1 . A high-pressure tank, comprising:
 a liner configured to store gas; and   a fiber-reinforced resin layer made of a fiber-reinforced resin and covering an outer surface of the liner, the fiber-reinforced resin layer having a first reinforcing layer covering the outer surface of the liner and a second reinforcing layer covering an outer surface of the first reinforcing layer, wherein   the first reinforcing layer includes a cylinder member made of the fiber-reinforced resin and having fibers oriented in a circumferential direction of the cylinder member and two dome members made of the fiber-reinforced resin,   both end portions of the cylinder member are joined to end portions of the two dome members, and   the second reinforcing layer has fibers oriented across the two dome members.   
     
     
         2 . The high-pressure tank according to  claim 1 , wherein
 the second reinforcing layer has, along an entire circumference of the second reinforcing layer, a plurality of fiber bundles oriented across the two dome members,   the fiber bundles include a first tilted layer in which the fiber bundles are tilted with respect to an axial direction of the first reinforcing layer and a second tilted layer in which the fiber bundles are tilted in an opposite direction to that of the fiber bundles of the first tilted layer with respect to the axial direction, and   the second reinforcing layer has the first and second tilted layers stacked on each other.