JPWO2021234921A5 - - Google Patents

Description

[0002]
and a pillar. When viewed from the side, the built-in support has a lattice shape in which a plurality of through-holes are arranged, and the axial direction of the plurality of through-holes is perpendicular to the axial direction of the built-in support. ing.
[0007]
According to the first aspect of the present invention, the built-in support has a honeycomb structure having a plurality of through-holes arranged adjacent to each other in a side view, and exhibits a lattice shape, thereby preventing elastic deformation. The rigidity of the built-in strut is increased compared to the case of partially providing an easy portion. When the wall portion of the tank body deforms outward or inward due to internal pressure fluctuation of the tank body, and a force is applied to pull or compress the built-in support in the axial direction, the grid structure causes the circumference of each through hole to bend in the axial direction. As a result, according to the built-in strut of the present invention, stretchability and rigidity are secured in a well-balanced manner, and stress concentration at the welded portion between the tank body and the built-in strut is reduced.
[0008]
In a second aspect, the through holes are hexagonal holes, triangular holes, or circular holes.
[0009]
According to the second aspect, since the lattice shape is a honeycomb shape, both high rigidity and good stretchability of the built-in pillars are achieved.
[0010]
In a third aspect, the built-in support column has a substantially cylindrical shape with circular welding surface portions that are welded to the wall portions at both ends thereof.
[0011]
According to the third aspect, if the built-in support has a substantially cylindrical shape with circular welding surfaces at both ends, the load applied to the welded part and the built-in support is evenly distributed around the axis. This reduces unreasonable stress concentration on the built-in struts.
[0012]
In the fourth aspect, two or more of the built-in struts are provided, and a connecting portion that connects adjacent built-in struts is provided.
[0013]
According to the fourth aspect, by providing the connecting portion for connecting the internal columns, in the unlikely event that an excessive force is applied to one of the internal columns, the force is distributed to the other internal column through the connecting portion. Let
[0014]
In a fifth aspect, the connecting portion is provided at a position away from both end portions of the built-in support.
[0015]
According to the fifth aspect, the connecting portion is provided at the portion that is highly stretchable due to the lattice shape, thereby reducing stress concentration on the connecting portion.
[0016]
In a sixth aspect, the connecting portion penetrates in the same direction as the through hole, and the built-in

Claims (6)

A fuel tank made of resin,
a tank body having walls facing the inside;
a built-in post having ends fixed to the opposing walls;
The built-in support has a honeycomb structure having a plurality of through-holes arranged adjacent to each other in a side view, and has a lattice shape,
The fuel tank, wherein the axial direction of the plurality of through-holes is perpendicular to the axial direction of the built-in strut. 2. The fuel tank according to claim 1, wherein said through hole is a hexagonal hole, a triangular hole or a circular hole. 2. The fuel tank according to claim 1, wherein the built-in column has circular welding surfaces on both ends to be welded to the wall and has a substantially cylindrical shape. Two or more of the built-in struts are provided,
2. The fuel tank according to claim 1, further comprising a connecting portion for connecting adjacent built-in struts. 5. The fuel tank according to claim 4, wherein the connecting portion is provided at a position separated from both ends of the built-in strut. 6. The fuel tank according to claim 5, wherein the connecting portion is provided with a plurality of connecting through-holes that penetrate in the same direction as the through-holes and are arranged in parallel in the axial direction of the built-in strut.