Vehicle front hood structure
A hood frame is provided with a center bead, front radiating beads and rear radiating beads to ensure that the front hood bends in the shape of inverted letter-V under a frontal crash load. Further, the beads provide the hood frame with a stiffness (including an out-of-plane stiffness) which is required of the front hood while the downward deformation of the hood frame under a downward load can be controlled and the HIC level can be set at an appropriate level.
1. A vehicle front hood structure, comprising a hood skin and a hood frame attached to a back side of the hood skin, the hood frame comprising:
a center bead projecting toward the hood skin and extending from an intersection between a connecting line connecting a pair of folding points defined centrally in a fore and aft direction on either side edge of the hood frame and a laterally central line outwardly in either lateral direction; and
a plurality of radiating beads projecting toward the hood skin and extending diagonally both in front of and behind the center bead in a diagonal direction of the hood frame,
wherein the hood frame includes a planar section having a prescribed width and not formed with a bead which is located between the center bead and an opposing end of each radiating bead.
2. The vehicle front hood structure according to claim 1 , wherein the center bead and/or the radiating beads are given with a semicircular cross section.
3. The vehicle front hood structure according to claim 1 , wherein the center bead extends continuously in the lateral direction.
4. The vehicle front hood structure according to claim 1 , wherein the hood frame includes a second planar section having a second prescribed width and not formed with a bead which is located between each lateral end of the center bead and an opposing side edge of the hood frame.
5. The vehicle front hood structure according to claim 1 , wherein the hood frame includes a connecting portion at which a laterally adjoining pair of the radiating beads in a laterally central part of the hood frame is connected to each other.
6. The vehicle front hood structure according to claim 1 , wherein the hood frame includes a dimple formed in a region which is not provided with a bead and located in a laterally and/or longitudinally central part along an outer periphery of the hood frame.
7. The vehicle front hood structure according to claim 2 , wherein the center bead extends continuously in the lateral direction.
8. The vehicle front hood structure according to claim 2 , wherein the hood frame includes a second planar section having a second prescribed width and not formed with a bead which is located between each lateral end of the center bead and the opposing side edge of the hood frame.
9. The vehicle front hood structure according to claim 3 , wherein the hood frame includes a second planar section having a second prescribed width and not formed with a bead which is located between each lateral end of the center bead and the opposing side edge of the hood frame.
10. The vehicle front hood structure according to claim 2 , wherein the hood frame includes a connecting portion at which a laterally adjoining pair of the radiating beads in a laterally central part of the hood frame is connected to each other.
11. The vehicle front hood structure according to claim 3 , wherein the hood frame includes a connecting portion at which a laterally adjoining pair of the radiating beads in a laterally central part of the hood frame is connected to each other.
12. The vehicle front hood structure according to claim 4 , wherein the hood frame includes a connecting portion at which a laterally adjoining pair of the radiating beads in a laterally central part of the hood frame is connected to each other.
13. The vehicle front hood structure according to claim 2 , wherein the hood frame includes a dimple formed in a region which is not provided with a bead and located in a laterally and/or longitudinally central part along an outer periphery of the hood frame.
14. The vehicle front hood structure according to claim 3 , wherein the hood frame includes a dimple formed in a region which is not provided with a bead and located in a laterally and/or longitudinally central part along an outer periphery of the hood frame.
15. The vehicle front hood structure according to claim 4 , wherein the hood frame includes a dimple formed in a region which is not provided with a bead and located in a laterally and/or longitudinally central part along an outer periphery of the hood frame.
16. The vehicle front hood structure according to claim 5 , wherein the hood frame includes a dimple formed in a region which is not provided with a bead and located in a laterally and/or longitudinally central part along an outer periphery of the hood frame.