Manufacturing method of high-pressure tank
This manufacturing method is a manufacturing method of a high-pressure tank that is formed by joining dome-shaped side end members to both ends of a cylindrical tube member and that has a first reinforcing layer made of fiber-reinforced resin. The manufacturing method has a joining step of joining the side end members to both ends of the tube member such that an outer wall surface of the tube member and an inner wall surface of each side end member face each other. In the joining step, a margin for overlap between each side end member and the tube member in an axial direction of the tube member is within a range of 5% or more to 35% or less relative to the inside diameter of the tube member.
1. A method of manufacturing a high-pressure tank that is formed by joining dome-shaped side end members to both ends of a cylindrical tube member, wherein the dome-shaped side end members and the cylindrical tube member form a first reinforcing layer made of fiber-reinforced resin, the manufacturing method comprising:
a step of joining the side end members to both axial ends of the tube member such that an outer circumferential wall surface of the tube member relative to a central longitudinal axis of the tube member and an inner circumferential wall surface of each of the side end members relative to a central longitudinal axis of the respective side end member face each other,
wherein in the joining step, a margin for overlap between each of the side end members and the tube member in an axial direction of the tube member is within a range of 5% or more to 35% or less relative to an inside diameter of the tube member, with portions of the side end members overlapping the outer circumferential wall surface of the tube member at both ends of the tube member,
wherein each of the side end members and the tube member are joined by a frictional force in the axial direction acting between each of the side end members and the tube member and a coefficient of friction between each of the side end members and the tube member is 0.22 or higher,
wherein a second reinforcing layer covers the entire first reinforcing layer comprising the cylindrical tube member and the side end members,
wherein the second reinforcing layer is formed by winding a fiber bundle impregnated with resin around the first reinforcing layer by helical winding,
wherein a liner is formed after the second reinforcing layer is formed by applying resin so as to cover an inner surface of the first reinforcing layer, and
wherein the liner is formed by inserting a nozzle through a through-hole of the first reinforcing layer, the resin of the liner is ejected through the nozzle, and when ejecting the resin, the nozzle is moved along an axial direction of the first reinforcing layer while the first reinforcing layer is rotated in a circumferential direction.
2. The method of manufacturing the high-pressure tank according to claim 1 , wherein the tube member includes a depression at each end of the outer circumferential wall surface of the tube member which are overlapped by circumferential ends of the portions of the side end members.