Reinforced structure for rear part of front side rail in vehicle
A reinforced structure for a rear part of a front side rail of a vehicle is configured to have a uniform cross-sectional shape for the rear rail (for example, a rear upper rail and a rear lower rail), which reinforces the rear part of the front side rail. The structure also provides lower and upper reinforcing members for forming a plurality of closed sections, such that strength is greatly improved in relation to a frontal impact in a vehicle collision. The reinforced structure also prevents the rear rail from being excessively deformed in a vehicle collision.
1. A reinforced structure for a rear part of a front side rail of a vehicle, the structure comprising:
a front side rail with a downwardly inclined rear part;
a rear lower rail with a front side inclined to overlap with the rear part of said front side rail and a horizontally formed back side, wherein said rear lower rail is U-shaped in cross-section;
a rear upper rail having a U-shaped cross-section overlapping with the upper side of said rear lower rail;
a lower flange formed at both upper edges of said rear lower rail;
an upper flange formed at both upper edges of said rear upper rail, wherein said lower flange and said upper flange are coupled to be overlapped;
a lower reinforcing member having a U-shaped cross-section, wherein said lower reinforcing member is installed inside said rear lower rail in an area between the front side of said rear lower rail and the horizontal formed back side thereof; and
an upper reinforcing member having an n-shaped cross-section mounted inside said rear upper rail in an area between the front part of said rear upper rail and the horizontal formed back side thereof for forming a closed section with said rear upper rail.
2. The reinforced structure as defined in claim 1 , wherein a width of the cross-section of said rear upper rail is smaller than that of the inner side of said lower reinforcing member, allowing a bottom side of said rear upper rail to be inserted into said lower reinforcing member.
3. The reinforced structure as defined in claim 2 , wherein a cross-sectional height of said rear upper rail is shorter than that of an inner cross-section of said rear lower rail for forming a closed section with said rear lower rail.
4. The reinforced structure as defined in claim 1 , wherein a side panel connecting member is coupled at a lateral surface of said rear lower rail for connecting with a side panel.
5. The reinforced structure as defined in claim 1 , wherein the cross-section of said rear lower rail is uniformly configured in a U-shape from the front to back side.
6. The reinforced structure as defined in claim 1 , wherein the cross-section of said rear upper rail is uniformly configured in a U-shape from a front to a back side.