An embodiment rear vehicle body structure of a vehicle including an underbody and an upper body coupled to the underbody includes a reinforcing member coupled to an upper surface of a rear floor panel provided on the rear side of the upper body and connected to both chassis frames of the underbody through the rear floor panel.

A hybrid structural assembly includes a vehicle structural member extending from a first end to a second end, and a composite reinforcement member attached to the vehicle structural member between the first and second ends of the vehicle structural member. The composite reinforcement member being formed by a continuous method and cut to a predetermined length extending from the first end to the second end.

A hybrid structural assembly for a motor vehicle includes a casting and a structural inlay. The casting includes a plurality of structural components joined together in a casting process to form structural load paths and extending in a plurality of directions in a 3D space. The casting includes a cast-allowable alloy material. The structural inlay is secured to at least one of the structural components. The structural inlay includes a material having at least one of a higher ductility and a higher toughness than the cast-allowable alloy material.

An embodiment frame connection structure includes a first body member including an inner portion and an outer portion integrally connected to each other along a transverse direction to form a first closed cross-section and at least one flange extending from the inner portion and the outer portion. It further includes a second body member including an inner portion and an outer portion integrally connected along a longitudinal direction to form a second closed cross-section, wherein the second body member is spot welded to the at least one flange of the first body member.

Provide is a roof structure of a vehicle, in which, a roof side outer panel, a roof panel, and a rear garter panel are joined. The roof side outer panel has: a roof joint surface portion, an up-down direction joint surface portion, and a front-back direction joint surface portion. The roof panel is joined to the roof joint surface portion in a state of being abutted against the roof joint surface portion. The up-down direction joint surface portion is formed at a lower end of the roof joint surface portion, and the rear garter panel is joined to the up-down direction joint surface portion. The front-back direction joint surface portion is formed at back ends of the up-down direction joint surface portion and the roof joint surface portion in a vehicle body front-back direction, and is joined to the rear garter panel.

A connection structure of an electric vehicle includes a cross member provided in a width direction of a vehicle body, a side member provided in a vehicle body length direction, and a joint member inserted into the cross member and connected to the side member. The joint member includes an insert portion inserted into the cross member, and a clamping portion connected to the side member.

According to the present invention, provided are a joint structure (100) which joins a plurality of overlapped steel members (110, 120) using a connecting element (130) having a shaft portion (131), the joint structure including: a first steel member (110); and one or more of second steel members (120) overlapping the first steel member (110), in which the shaft portion (131) of the connecting element (130) is penetrated through the second steel member (120), and the shaft portion (131) of the connecting element (130) and the second steel member (120) are joined by friction welding, and the shaft portion (131) and the first steel member (110) are joined by friction welding, and a joining method for obtaining the joint structure.

A vehicle-body structure of a vehicle includes a first frame forming a closed cross-section portion, a reinforcing member disposed in the closed cross-section portion and connected to the first frame, and another vehicle-body member connected to an outer surface of the first frame. A connection portion of the first frame and the reinforcing member includes a rigid joint portion where the first frame and the reinforcing member are joined, and a flexible joint portion where the first frame and the reinforcing member are joined, with a damper member being disposed therebetween. The other vehicle-body member is connected to the first frame in a manner such that at least a part of the other vehicle-body member overlaps the flexible joint portion in a thickness direction of the first frame, and has a high rigidity portion that enhances rigidity at the part that overlaps the flexible joint portion.

A body structure of a vehicle includes a first panel and a second panel that form a closed cross-sectional portion, a partitioning panel that partitions the closed cross-sectional portion, and a reinforcement member disposed between the first panel and the partitioning panel, and includes a panel joining portion joined to the first panel, and a flange portion joined to the partitioning panel. A joining portion formed by the reinforcement member includes a rigid coupling portion in which the first panel and the panel joining portion are coupled to each other while being in contact with each other, and a flexible coupling portion in which the partitioning panel and the flange portion are coupled, with a damping member being provided therebetween. The partitioning panel includes an extended portion that extends from a vicinity of the flexible coupling portion toward the second panel and is joined to the second panel.

A wheel house reinforcement structure is configured to reinforce stiffness of a wheel house in a vehicle body, and includes: a mounting part configured to form a top surface of an inner wheel house, and on which an absorber mounting bracket is mounted; a cover part integrally extending from the mounting part while being downward of an inner side end of the mounting part, and an assembling hole assembled with a quarter panel being formed in a lower side of the cover part; and a trunk lid mounting part integrally extending toward a rear direction in a top side of the mounting part, a hinge mounting end having a mounting hole in which a hinge portion of a trunk lid is mounted being formed at a rear end of the trunk lid mounting part.