Patent ID: 11964439
Assignee: NITTO DENKO CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A reinforcement structure comprising:
an adherend; and
a reinforcement sheet adhering to the adherend and reinforcing the adherend;
wherein the adherend includes:
a first surface extending in a first direction;
a second surface extending in a second direction crossing the first direction; and
a first corner portion connecting the first surface to the second surface;

wherein the reinforcement sheet includes:
a front layer containing a plurality of fibers and positioned at spaced intervals to the first surface, the second surface, and the first corner portion;
an adhesive layer being in direct contact with the first surface, the second surface, and the first corner portion; and
a core material layer obtained by curing a core material layer that is in an uncured state, and contains an unmodified epoxy resin and a rubber-modified epoxy resin as a resin, and further contains a latent curing agent that cures the resin at 80° C. or more and 200° C. or less, the cured core material layer being disposed between the front layer and the adhesive layer;
wherein the adhesive layer is provided along the first surface, the second surface, and the first corner portion,
wherein the front layer includes:
a first front layer portion positioned at spaced intervals to the first surface in the second direction and extending in the first direction;
a second front layer portion positioned at spaced intervals to the second surface in the first direction and extending in the second direction; and
a third front layer portion positioned at spaced intervals to the first corner portion in a third direction crossing both directions of the first direction and the second direction and connecting the first front layer portion to the second front layer portion;
wherein a gap between the first surface and the third front layer portion in the second direction gradually increases as it gets closer to the first corner portion in the first direction with respect to a gap between the first surface and the first front layer portion in the second direction; and
wherein a gap between the second surface and the third front layer portion in the first direction gradually increases as it gets closer to the first corner portion in the second direction with respect to a gap between the second surface and the second front layer portion in the first direction;

wherein the cured core material layer includes:
a first portion along the first surface;
a second portion along the second surface; and
a third portion along the first corner portion; and
wherein a thickness of the third portion along the second direction is thicker than a thickness of the first portion along the second direction and a thickness of the third portion along the first direction is thicker than a thickness of the second portion along the first direction.