A door beam including an aluminum alloy extruded material of a closed section structure having a welded part along the longitudinal direction, webs and an outer flange are inhibited from buckling and further the welded part in the outer flange is inhibited from breaking at the time of collision. In a cross section of an aluminum alloy extruded material perpendicular to the extrusion direction, each of the webs includes an outer part connected to the outer flange and an inner part connected to an inner flange and the thickness of the outer part is larger than the thickness of the inner part. Each of the outer parts is positioned in a region outside a cross section center of the aluminum alloy extruded material in the vehicle body width direction.

A beam assembly includes a first beam that has a first tubular portion and a first projecting portion that extends from the first tubular portion. A second beam has a second tubular portion and a second projecting portion that extends from the second tubular portion. The elongated interior of the first tubular portion defines a first hollow area and the elongated interior of the second tubular portion defines a second hollow area. The first beam is attached to the second beam with the first projecting portion attached to the second tubular portion and the second projecting portion attached to the first tubular portion to define a third hollow area between the first and second projecting portions.

The reinforcement element for reinforcing the structure of a door of a vehicle extends along a main direction and comprises at least a main portion having a reinforcing cross-section (40) extending in a plane substantially perpendicular to the main direction. The reinforcing cross-section (40) includes at least four adjacent branches (42a, 42b, 42c, 42d, 42e, 42f, 42g), each extending in different directions, two successive branches forming a non-zero angle, at least two of the non-zero angles being of opposite signs.

The reinforcement element for reinforcing the structure of a door of a vehicle extends along a main direction and comprises at least a main portion having a reinforcing cross-section (40) extending in a plane substantially perpendicular to the main direction. The reinforcing cross-section (40) includes at least four adjacent branches (42a, 42b, 42c, 42d, 42e, 42f, 42g), each extending in different directions, two successive branches forming a non-zero angle, at least two of the non-zero angles being of opposite signs.

A door of recreational vehicles includes a first peripheral frame, a first outer panel, shaped to match the first peripheral frame and positioned inside the first peripheral frame, with the first outer panel extending according to a predetermined plane (P), and a second inner covering panel substantially superposed on the first outer panel.

A door impact beam is provided. The beam includes a beam body that has a W-shaped cross section and a reinforcement portion. The reinforcement portion is disposed in middle of the beam body and has a width greater than that of the beam body. Additionally, the reinforcement portion has first and second edges that are symmetrically convex with respect to a central axis of the beam body and the first and second edges have a curved streamlined shape.

An arrangement for the transfer of collision forces possibly resulting from a crash event from one body part to another body part of a motor vehicle, with a hollow profile acting as a crash profile, which hollow profile runs in the main direction of travel or transversely to the main direction of travel is loaded on pressure in the case of the crash event, and is frontally supported on each of the body parts. The hollow profile is frontally supported on the respective body part by means of interposition of in each case a load transfer element.

A steel composition, a reinforcement part of a vehicle using the steel composition and a method of manufacturing the reinforcement part using the steel composition are provided. In particular, the steel composition includes increased content of carbon components and the steel composition is processed by rapid heating and immediate quenching.

A side vehicle-body structure of a vehicle includes a rear door having a center pillar extending in a vehicle up-down direction built in a front portion of the rear door, and a front door having a door impact bar extending in a vehicle front-rear direction built in the front door. A rear end of the door impact bar is disposed to overlap with the center pillar in a vehicle side view, a reinforcement gusset that connects a lower portion of the front door and a rear portion of the door impact bar to each other is included in an inner portion of the front door, and a side sill extending in the vehicle front-rear direction is adjacently disposed below a connecting portion of a lower portion of the front door at which the lower portion of the front door is connected to the reinforcement gusset.

A vehicle door structure that can displace inward a region directly above a lower end of a door built-in center pillar while preventing displacement of a door lower surface to absorb lateral collision energy immediately after lateral collision is provided. In the vehicle door structure including a door built-in center pillar extending from an upper end to a lower end at a front end in a rear door of a biparting door system, a reinforcement is provided on a door lower surface below the door built-in center pillar, a part of the lower end of the door built-in center pillar is mounted to the reinforcement, and a low rigidity portion having lower rigidity than an upper part the door built-in center pillar is provided directly above the lower end of the door built-in center pillar.