A side sill assembly of the vehicle includes a side sill inner, a side sill outer, and a reinforcement unit provided between the side sill inner and the side sill outer. The reinforcement unit includes an upper member provided in a longitudinal direction of the vehicle; a lower member provided in the longitudinal direction of the vehicle, and located to be spaced from the upper member under the upper member; and an intermediate member having an upper surface bonded to a bottom portion of the upper member and a lower surface bonded to an upper surface of the lower member alternately formed thereon.

A side sill assembly of the vehicle includes a side sill inner, a side sill outer, and a reinforcement unit provided between the side sill inner and the side sill outer, wherein the reinforcement unit may include a plurality of cell members having an upper member and a lower member bonded to each other vertically at intervals therebetween, and disposed in a longitudinal direction of the vehicle at intervals from each other therebetween; and a connector bonded to rear and front end portions of different cell members among the plurality of cell members to connect the plurality of cell members to each other in the longitudinal direction of the vehicle.

A side sill assembly of a vehicle with reinforced stiffness includes a side sill inner, a side sill outer, and a reinforcement unit provided between the side sill inner and the side sill outer. The reinforcement unit includes an upper member having a first upper surface and a first lower surface located lower than the first upper surface, wherein the first upper surface and the first lower surface are alternately disposed in a longitudinal direction of the vehicle; a lower member having a second upper surface and a second lower surface located lower than the second upper surface, wherein the second upper surface and the second lower surface are alternately disposed in the longitudinal direction of the vehicle; and an intermediate member bonded to the upper member and the lower member, respectively, between the upper member and the lower member.

A lower vehicle-body structure includes: side sills extending along a vehicle front-rear direction and provided on both sides in a vehicle width direction of a vehicle body, respectively; a front undercover covering a lower surface of the vehicle body and having a first flange which extends to an outer bottom surface of each of the side sills; and a side sill garnish having a second flange covering the outer bottom surface from outside in the vehicle width direction. The first flange and the second flange are overlapped with each other in a vehicle up-down direction, and are fastened together to the outer bottom surface of the side sill.

A joint body includes first and second metal members and a joint portion including a welded portion where the first and second metal members are joined together, the welded portion having a line shape. The joint portion includes first and second longitudinal portions and a plurality of connecting portions. The first longitudinal portion has first intersecting portions arranged in a first direction and extends in the first direction. The second longitudinal portion has second intersecting portions arranged in the first direction and extends in the first direction. The welded portion intersects itself at the first and second intersecting portions. The connecting portions are arranged in the first direction. The connecting portions extend in a first direction and connect the first and second longitudinal portions.

A cover device for a side sill of a passenger vehicle includes a sill cover which has a cover element securable on the side sill and a mobile cover element which is disposable in a length region of the side sill below a door opening of the passenger vehicle. The mobile cover element is displaceable between a covering position and an entry position by a drive unit and the drive unit, configured as a pre-assembled structural unit, has a motor and is disposed in a region of the cover element by a holding device. The motor is disposed on an outside of the cover element and protrudes into an interior of the sill cover with a motor shaft.

An automobile structural member being a hollow automobile structural member having: a top wall part; a bottom wall part facing the top wall part; and a first heightwise wall part and a second heightwise wall part being a pair of heightwise wall parts that connect to the top wall part and the bottom wall part, the automobile structural member including: a first reinforcing part having one end portion joined to the top wall part and the other end portion joined to the bottom wall part; and a second reinforcing part having one end portion joined to either the first heightwise wall part or the second heightwise wall part, and the other end portion joined to the first reinforcing part, in which a plurality of the second reinforcing parts are provided along a height direction of the heightwise wall part.

An embodiment component integration type rear lower includes a body frame having an end portion of a first side and an end portion of a second side and having a predetermined length, a front-rear connection member connecting a side sill at the end portion of the first side and connecting a rear side member at the end portion of the second side, a bush mounting member coupling a bush to the end portion of the first side, and a coupled torsion beam axle (CTBA) mounting member coupled to at least one of a CTBA, a chassis spring, or a shock absorber, the at least one of the CTBA, the chassis spring, or the shock absorber being engaged with the end portion of the second side.

The disclosure provides a vehicle body rear part structure. The vehicle body rear part structure includes a load support part on a quarter pillar. The load support part includes a side sill stiffener, a quarter pillar stiffener and a damper stiffener. The side sill stiffener reinforces a side sill and forms a part of the quarter pillar. The quarter pillar stiffener is provided continuously with the side sill stiffener and reinforces the quarter pillar. The damper stiffener is provided above a rear wheel house and joined to the quarter pillar stiffener and a roof side rail.

Upper frames and a lower frame that connect a rear end of a coupled body composed of a side sill and a rear pillar and a rear side housing to each other are spaced apart in a vehicle up-down direction. An inclined angle at which a lower frame is inclined to be closer to a vehicle inner side toward a vehicle rear side is larger than inclined angles at which the upper frames are inclined to be closer to the vehicle inner side toward the rear side. A lower joined portion to which a rear end of the lower frame is joined is on a vehicle-width-direction inner side with respect to an upper joined portion in the rear side housing, which is composed of a single member including at least the lower frame rear-end joined portion, and the first and second upper frame rear-end joined portions, and extending therebetween.