Abstract: A rear vehicle body reinforcement structure may include side seal members disposed in the left and right sides of the vehicle along a width direction of the vehicle; rear floor side members extending along the longitudinal direction of the vehicle and assembled with the side seal members respectively by being disposed in the left and right of the vehicle along the width direction of the vehicle, a center floor panel and a rear floor panel, assembled to the side seal members; center floor side members extending along the longitudinal direction of the vehicle and assembled to the center floor panel; a tunnel portion that is provided in the center floor panel and protrudes upward along the height direction of the vehicle; and tunnel side members that extend along the longitudinal direction of the vehicle and assembled to the tunnel portion.

Abstract: A rear vehicle body reinforcement structure may include side seal members disposed in the left and right sides of the vehicle along a width direction of the vehicle; rear floor side members extending along the longitudinal direction of the vehicle and assembled with the side seal members respectively by being disposed in the left and right of the vehicle along the width direction of the vehicle, a center floor panel and a rear floor panel, assembled to the side seal members; center floor side members extending along the longitudinal direction of the vehicle and assembled to the center floor panel; a tunnel portion that is provided in the center floor panel and protrudes upward along the height direction of the vehicle; and tunnel side members that extend along the longitudinal direction of the vehicle and assembled to the tunnel portion.

Abstract: A fiber-reinforced vehicle body structure includes a first frame made of fiber-reinforced plastic or carbon fiber-reinforced plastic and having multiple sections, and a second frame that continuously extends from any one of the multiple sections of the first frame.

Abstract: A method of assembling a sub-frame of a vehicle with the front side member of the vehicle includes integrally forming a supporting end of a mounting nut that protrudes in a radial direction in a center of an external circumference of the mounting nut, forming a through hole in a lower surface of the front side member, forming a seat as a groove in an internal surface of the through hole, inserting a lower end of the mounting nut into the through hole so that the supporting end is supported by a circumference of the through hole, settling a head of the mounting nut in the seat, and welding the supporting end and the head along the circumference of the through hole and a side of the seat to assemble the sub-frame to the front side member.

Abstract: A roof side rail is connected to a roof panel and includes a multi-sectional rail having a plurality of integrally formed ribs and bent along a shape of an upper portion of a side surface of a vehicle body, and a reinforcement rail that is combined with an inner side surface of the rail, an upper side flange is connected to the roof panel, and a lower side flange is engaged with a weather strip.

Abstract: A fiber-reinforced vehicle body structure includes a first frame made of fiber-reinforced plastic or carbon fiber-reinforced plastic and having multiple sections, and a second frame that continuously extends from any one of the multiple sections of the first frame.

Abstract: A roof side rail is connected to a roof panel and includes a multi-sectional rail having a plurality of integrally formed ribs and bent along a shape of an upper portion of a side surface of a vehicle body, and a reinforcement rail that is combined with an inner side surface of the rail, an upper side flange is connected to the roof panel, and a lower side flange is engaged with a weather strip.

Abstract: A method of assembling a sub-frame of a vehicle with the front side member of the vehicle includes integrally forming a supporting end of a mounting nut that protrudes in a radial direction in a center of an external circumference of the mounting nut, forming a through hole in a lower surface of the front side member, forming a seat as a groove in an internal surface of the through hole, inserting a lower end of the mounting nut into the through hole so that the supporting end is supported by a circumference of the through hole, settling a head of the mounting nut in the seat, and welding the supporting end and the head along the circumference of the through hole and a side of the seat to assemble the sub-frame to the front side member.

Abstract: A front vehicle body structure may include a front side member extending in a longitudinal direction of a vehicle, a fender apron upper member disposed in an outer direction of the front side member in a traverse direction of the vehicle, and a fender apron front reinforcement member extending in the traverse direction of the vehicle and connecting the fender apron upper member and the front side member.

Abstract: A front vehicle body structure may include a front side member extending in a longitudinal direction of a vehicle, a fender apron upper member disposed in an outer direction of the front side member in a traverse direction of the vehicle, and a fender apron front reinforcement member extending in the traverse direction of the vehicle and connecting the fender apron upper member and the front side member.