JP2001301658A - Hood structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hood structure capable of suppressing local deformation in spite of its lightness and being reliably bend-deformed at a head-on collision. SOLUTION: An inner panel 5 is provided with a fitting section 11 of a hinge 7, a fragile section 13 nearly at the center section in the longitudinal direction of a vehicle body, a fitting section 15 of a lock member 9, a working face section 17 of bumper rubber located between the fragile section 13 and the fitting section 15 of the lock member 9, a reinforce section 19 on the peripheral edge of a hood 1 for connecting the fitting section 11 of the hinge 7, the fragile section 13, the fitting section 15 of the lock member 9, and the working face section 17 of bumper rubber, a flared energy absorption section 23 where an apex section 97 is kept in contact with an outer panel 3, and connecting ribs 101 and 107 connecting the reinforce section 19 and the slope section 99 of the energy absorption section 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hood structure for an automobile.

[0002]

2. Description of the Related Art Generally, a hood located at a front portion of a vehicle body has a rear portion fixed to a vehicle body skeleton side by a hinge, and a front center can be freely disengaged from the vehicle body skeleton side by a lock mechanism. In addition, near the front end of the side of the hood, a contact surface with a bumper rubber for keeping a constant gap with the headlamp side is provided, and is in contact with the bumper rubber on the body frame member side.
In such a hood structure, when the plate thickness is reduced, a phenomenon that the hood is bent and deformed with the hinge at the rear portion of the hood and the lock mechanism at the front portion tends to occur. That is, a force acts on the outer panel of the hood during waxing or the like, or the upper surface of the hood receives wind pressure during traveling, which may cause bending deformation such as sinking between the rear hinge portion and the front lock mechanism. There is. Therefore, it is necessary to increase the thickness of the hood, and there is a problem that the weight increases.

When the hood is made of resin, the elastic modulus of the material is smaller than that of a light alloy such as a steel plate or aluminum. Therefore, in the conventional structure, it is necessary to increase the thickness of the hood to secure the rigidity of the entire hood. There is also a problem that the weight increases.

On the other hand, a hood reinforcement structure formed of resin is disclosed in Japanese Patent Application Laid-Open No. 10-129528. In this structure, reinforcing ribs are arranged on the inner panel of the hood. Therefore, since the stiffness of the hood can be secured to some extent by the reinforcing ribs, a certain increase in weight can be suppressed.

[0005]

However, in the above-mentioned prior art, a fragile portion is provided at the center of the vehicle body in the front-rear direction, and the hood is bent at the center of the vehicle body in the front-rear direction by an impact force from the front of the vehicle body. The entire hood is easily bent and deformed starting from the fragile portion due to the reaction force from rubber or the like, and it is necessary to increase the thickness of the hood to some extent, and there is a limit to weight reduction.

[0006] It is an object of the present invention to provide a hood structure capable of reducing the weight.

[0007]

According to a first aspect of the present invention, there is provided an outer panel and an inner panel, wherein a rear portion of the vehicle body in the front-rear direction is hingedly mounted on the vehicle body side via a hinge, and a front portion is provided via a lock member. In the hood structure detachably coupled to the vehicle body side, the inner panel has a mounting portion for the hinge, a weak portion substantially at the center in the vehicle longitudinal direction, a mounting portion for the lock member, the weak portion, The bumper rubber contact surface located between the lock member attachment portions, the hinge attachment portion, the fragile portion, the lock member attachment portion, the hood peripheral portion connecting the bumper rubber contact surface, and the apex portion are provided. It is characterized in that a flared energy absorbing portion abutting on the outer panel and a connecting rib connecting the reinforcing portion and a slope portion of the energy absorbing portion are provided.

The invention according to claim 1 is the hood structure according to claim 1, wherein the reinforcing portion has at least a mounting portion side of the lock member, a hinge mounting portion side, and a hood between the two mounting portion sides. Are provided at three locations, namely, the side portion of the vehicle.

According to a third aspect of the present invention, there is provided the hood structure according to the second aspect, wherein the reinforcing portion on the mounting portion side of the lock member includes:
It consists of a bottom wall portion, a vertical wall portion before and after rising from the bottom wall portion, and an upper flange portion provided at an upper end of the vertical wall portion, wherein the upper flange portion and the bottom wall portion are more than the vertical wall portion. It is characterized in that it is formed thick and the front and rear vertical wall portions are connected by ribs.

According to a fourth aspect of the present invention, in the hood structure according to the second or third aspect, the reinforcing portion on the side of the hood comprises:
In addition to the contact surface of the bumper rubber, the bumper rubber includes a bottom wall located on the front side of the fragile portion, left and right vertical walls rising from the bottom wall, and an upper flange provided at an upper end of the vertical wall. The upper flange portion and the bottom wall portion are formed to be thicker than the vertical wall portion.

According to a fifth aspect of the present invention, in the hood structure according to any one of the second to fourth aspects, the reinforcing portion on the side of the hinge mounting portion includes the hinge mounting portion and the fragile portion. And a bottom wall portion, left and right vertical wall portions rising from the bottom wall portion, and an upper flange portion provided at an upper end of the vertical wall portion, and the left and right vertical wall portions are formed by ribs. It is characterized by being connected.

According to a sixth aspect of the present invention, in the hood structure according to the third or fourth aspect, the rib connecting the vertical wall portions is
It is characterized by crossing between vertical wall portions.

According to a seventh aspect of the present invention, in the hood structure according to the third or fifth aspect, at least one of the mounting portion of the lock member and the mounting portion of the hinge is provided on a bottom wall portion of the reinforcing portion. A boss portion is provided, and the boss portion and the vertical wall portion of the reinforcing portion are connected by a rib.

According to an eighth aspect of the present invention, there is provided the hood structure according to the first aspect, wherein the energy absorbing portions are entirely dispersed in a region surrounded by the reinforcing portion. I do.

According to a ninth aspect of the present invention, there is provided the hood structure according to the first aspect, wherein the inner panel is formed of a light metal casting.

According to a tenth aspect of the present invention, there is provided the hood structure according to the first aspect, wherein the outer panel is formed of a resin material.

[0017]

According to the first aspect of the present invention, a rear part of the vehicle body in the front-rear direction is attached to the vehicle body via a hinge so as to be openable and closable, and a front part is provided on the vehicle body side via a lock member. In the hood structure which is detachably coupled, the inner panel is provided between the attachment portion of the hinge, the fragile portion substantially at the center in the vehicle longitudinal direction, the attachment portion of the lock member, and the attachment portion of the fragile portion and the lock member. The contact surface of the bumper rubber, the hinge attachment portion, the fragile portion, the lock member attachment portion, the reinforcement portion of the hood peripheral portion connecting the bumper rubber contact surface, and the divergent energy where the vertex contacts the outer panel. Since the absorbing portion and the connecting rib for connecting the reinforcing portion and the slope of the energy absorbing portion are provided, the hood can be moved from the fragile portion to the front and rear of the vehicle body in the event of a frontal collision. Can be deformed folded approximately in the middle portion of the direction, it is possible to perform a sufficient energy absorption.

When a load is applied from the upper surface of the hood and a reaction force is applied to the bumper rubber, the hinge, and the lock member, the load is first dispersed to the peripheral portion of the hood by the reinforcing portion. The load can be transmitted to the area surrounded by the reinforcing portion through a connecting rib or the like. From this range, the load can be dispersed from the top to the outer panel side via the energy absorbing portion. Therefore, the rigidity of the entire hood can be secured, and the increase in weight can be significantly suppressed while suppressing the deformation.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the reinforcing portion is formed at least between the mounting portion side of the lock member, the mounting portion side of the hinge, and the side portion of the hood between the two mounting portions. Since it is provided in three places, when a load is applied from the upper surface of the hood, the load is reliably distributed to the outer panel side via the reinforcing part and energy absorbing part against the reaction force from the lock member, hinge, and bumper rubber side. Thus, it is possible to surely bend and deform substantially at the center in the front-rear direction of the vehicle body at the time of a frontal collision while ensuring the overall rigidity more reliably.

According to a third aspect of the present invention, in addition to the effect of the second aspect of the present invention, the reinforcing portion on the mounting portion side of the lock member includes a bottom wall, a vertical wall before and after rising from the bottom wall, and a vertical wall. The upper flange portion and the bottom wall portion are formed thicker than the vertical wall portion, and the front and rear vertical wall portions are connected by ribs. The bending strength and torsional rigidity of the reinforcing part are increased against the reaction force of the above, and cross-sectional deformation can be suppressed, so that the force can be reliably diffused to the entire inner panel, and the deformation of the reinforcing part at the lock member location Can be reliably suppressed.
Further, since the rigidity of the reinforcing portion is increased, the rigidity of the outer panel can be improved.

According to the fourth aspect of the present invention, in addition to the effects of the second or third aspect, the reinforcing portion on the side of the hood includes the contact surface of the bumper rubber and the bottom wall extends to the front side of the fragile portion. And the upper and lower vertical wall portions rising from the bottom wall portion and the upper flange portion provided at the upper end of the vertical wall portion, the upper flange portion and the bottom wall portion are formed thicker than the vertical wall portion In addition, the bending rigidity and torsional rigidity of the reinforcing portion can be increased, and cross-sectional deformation can be suppressed. Therefore,
Even when there is a reaction force from the bumper rubber side, local deformation can be suppressed, and clearance with the headlamp side can be ensured.

According to the fifth aspect of the present invention, in addition to the effects of any one of the second to fourth aspects, the reinforcing portion on the side of the hinge mounting portion includes the hinge mounting portion and extends between the fragile portion and the rear side. It shall consist of a bottom wall part and left and right vertical wall parts rising from the bottom wall part, and an upper flange part provided at the upper end of the vertical wall part,
Since the left and right vertical wall portions are connected by the rib, the bending rigidity and the torsional rigidity of the reinforcing portion can be increased on the attachment portion side of the hinge. Therefore, even when a reaction force is received from the hinge side, local deformation can be suppressed, and the force can be reliably diffused to the entire inner panel.

According to the sixth aspect of the present invention, in addition to the effects of the third or fourth aspect of the present invention, since the ribs connecting the vertical wall portions intersect between the vertical wall portions, the ribs include the mounting portions for the lock members. The torsional rigidity of the reinforcing portion including the reinforcing portion and the hinge attaching portion can be increased, and the deformation of the entire hood can be further suppressed.

According to the seventh aspect of the invention, in addition to the effects of the third or fifth aspect, at least one of the mounting portion of the lock member and the mounting portion of the hinge is provided with a boss provided on the bottom wall of the reinforcing portion. Since the boss and the vertical wall of the reinforcing part are connected by a rib, the reaction force from the lock member and the hinge side is transmitted from the boss to the vertical wall of the reinforcing part via the rib, and the general inner panel Thus, the deformation of the reinforcing member on the lock member and the hinge side can be reliably suppressed.

According to the eighth aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the energy absorbing portions are entirely dispersed in the area surrounded by the reinforcing portion, the energy absorbing portions are not absorbed by the reinforcing portion. The load transmitted to the portion can be diffused to the outer panel side by the energy absorbing portion, and the hood rigidity can be further improved.

According to the ninth aspect of the present invention, in addition to the effects of the first aspect, the inner panel is formed of a light metal casting, so that a hood having a high specific rigidity and a lighter weight can be formed.

According to the tenth aspect, in addition to the effect of the first aspect, since the outer panel is formed of a resin material, specific elastic energy is high, and plastic deformation is suppressed by an external force at the time of applying wax to the outer panel. can do.

[0028]

FIG. 1 is an exploded perspective view of a hood according to an embodiment of the present invention. As shown in FIG. 1, a hood 1 to which the hood structure of the present embodiment is applied includes an outer panel 3 made of resin and an inner panel 5 made of light metal casting, and a rear portion in the front-rear direction of the vehicle opens and closes toward the vehicle via a hinge 7. Mounted freely. Although only the left hinge 7 is shown in FIG. 1, a symmetrical hinge is also attached to the right. A striker 9 constituting a part of a lock member is attached to a front portion of the hood 1, and is configured to be detachably coupled to a lock member on a vehicle body frame side.

The outer panel 3 is formed of a resin material such as a thermoplastic resin. The outer panel 3 is formed of a resin having a color capable of expressing a vehicle body color without painting, by suppressing out-of-plane plastic deformation due to waxing or the like, or is formed by insert-molding a color film. .

The inner panel 5 is made of a light metal casting such as an aluminum alloy or a magnesium alloy. The inner panel 5 has a mounting portion 11 for the hinge 7 and a fragile portion 13 substantially at the center in the vehicle longitudinal direction.
The mounting portion 15 of the striker 9 and the fragile portion 13
And a contact surface 17 of the bumper rubber located between the mounting portions 15 of the striker 9 and the mounting portions 11 of these hinges,
Reinforcing portion 1 at the periphery of hood 1 connecting weak portion 13, lock member attaching portion 15, and bumper rubber contact surface 17.
9 is provided. The area surrounded by the reinforcing portion 19 is a general portion 21 having a film plate shape, and a plurality of energy absorbing portions 23 are provided.

More specifically, the reinforcing portion 1
Numerals 9 are provided at least at three locations: the mounting portion 15 side of the striker 9, the mounting portion 11 side of the hinge 7, and the side portion of the hood 1 between the mounting portions. The hood 1 is provided continuously from the mounting portion 15 side of the striker 9 which is the front portion of the inner panel 5 to the mounting portion 11 side of the hinge 7 which is the rear portion.

Referring to FIG. 2, which is a cross-sectional view taken along the line SA-SA of FIG. 1, the reinforcing portion 25 at the front of the hood 1 has a bottom wall 27 and vertical walls before and after rising from the bottom wall 27. Part 2
9 and 31 and upper flange portions 33 and 35 provided at the upper ends of the vertical wall portions 29 and 31 are formed in a concave cross section. The upper flange portions 33 and 35 and the bottom wall portion 27 are formed thicker than the vertical wall portions 29 and 31. (T ₂₇ > t ₃₁ ) The mounting portion 15 of the striker 9 includes, for example, four boss portions 37 and is provided integrally with the bottom wall portion 27. The striker 9 is joined to the mounting portion 15 from the lower surface side, and is fastened and fixed by screwing a bolt 45 into the boss portion 37.

The vertical wall portion 2 of the boss portion 37 and the reinforcing portion 25
9 and 31 are connected by a rib 39. The left and right boss portions 37 are connected by a rib 40 arranged in an X shape with the rib 41 interposed therebetween. Rib 41 is also vertical wall 2
9, 31 are connected. The ribs 39 and 41 extend in the front-rear direction and are also integrally connected to the bottom wall 27.

As shown in FIG. 1, the vertical wall portions 29 and 31 are further connected by a plurality of ribs 43. Each rib 43 intersects between the vertical wall portions 29 and 31 and has an X-shape when viewed from a plane. Are located in The rib 43 is also connected to the bottom wall 27.

The reinforcing portion 47 on the mounting portion side of the hinge 7 is
Referring to FIG. 3, which is a cross-section taken along the line SB-SB in FIG. 1, it includes the attachment portion 11 of the hinge 7 and is located on the rear side of the weak portion 13, and rises from the bottom wall portion 49. It is formed in a concave cross section including left and right vertical wall portions 51 and 53 and upper flange portions 55 and 57 provided at upper ends of the vertical wall portions 51 and 53. The reinforcing portion 47 of the hinge 7 on the side of the mounting portion 11 has a bottom wall portion 49, vertical wall portions 51 and 53, and upper flange portions 55 and 57 having substantially the same thickness. It is formed to be substantially the same as the vertical wall portions 29 and 31 of the reinforcing portion 25.

The mounting portion 11 of the hinge 7 has a boss 59
The boss portion 59 is provided integrally with the bottom wall portion 49 of the reinforcing portion 47. Then, the hinge 7 is joined from the lower surface side of the bottom wall portion 49, and the bolt 61 is screwed into the boss portion 59 and fastened and fixed.

The boss portion 59 and the vertical wall portions 51 and 53 are
They are connected by ribs 63. In the present embodiment, the ribs 63 are arranged obliquely with respect to the vehicle width direction. The boss portions 59 are also connected to each other by the rib 65. The rear boss 59 is connected to a vertical wall 69 at the rear end by a rib 67. The vertical wall 69 at the rear end
The vertical wall portion 51 of the reinforcing portion 47 on the attachment portion 11 side of the hinge 7
The upper flange portion 71 is provided at the upper end thereof and is connected to the upper flange portion 55. The vertical wall 69 at the rear end is continuous with the bottom wall 73 at the rear end, and the bottom wall 7
Numeral 3 is continuous with the general portion 21 with an upward step.

The right and left vertical wall portions 51 and 53 are provided with ribs 75.
Are connected by The rib 75 intersects between the vertical wall portions 51 and 53 and is arranged in an X shape when viewed from a plane. The rib 75 is also integrally connected to the bottom wall 49.

The fragile portion 13 is formed continuously from the bottom wall portion 49 to the general portion 21 in the vehicle width direction, and is formed by an upwardly convex curved portion. The fragile portion 13 allows the hood 1 to be bent and deformed at substantially the center in the front-rear direction by an impact force from the front of the vehicle body.

The reinforcement 77 on the side of the hood 1 is shown in FIG.
Referring also to FIG. 4 showing a cross section taken along the line SC-SC of FIG.
The contact surface 81 of the damper rubber 79, and
Located on the front side of the weak portion 13, the bottom wall portion 83 and the bottom wall portion 83
Left and right vertical wall portions 85 and 87 rising from the vertical wall portion 8
Upper flange portions 89, 91 provided at the upper ends of 5, 87
It consists of And the upper flanges 89, 91 and
And the bottom wall portion 83 is formed thicker than the vertical wall portions 85 and 87.
ing. (T₈₃, T₈₉, T₉₁)> (T₈₅, T₈₇) Top
The thickness of the flanges 89 and 91 and the bottom wall 83 is the same as that of the hood.
(1) Bottom wall portion 27 of front reinforcing portion 25, upper flange portion 3
3 and 35, and the vertical wall portions 85 and 87 are
The portions 29 and 31 are formed to have the same thickness.
(T₈₃, T₈₉, T ₉₁) = (T₃₃, T₃₅), (T₈₅,
t₈₇) = (T₂₉, T₃₁The bumper rubber 79 is a radiator that is a body frame member.
Data core support upper 93,
The contact surface 81 of the bumper rubber 79 is a bumper rubber.
Hood 1 and headlamp
To maintain a constant gap with the side finisher 95.
ing.

The energy absorbing portion 23 includes a vertex portion 97 and a slope portion 99, and is formed in a conical shape that diverges downward. The energy absorbing portions 23 are disposed in a distributed manner as a whole in the general portion 21 in a range surrounded by the reinforcing portion 19. On the front side of the hood 1, the slope portion 99 of the energy absorbing portion 23 and the reinforcing portion 25 are connected by a rib 101 as shown in FIGS.

A vertical wall portion 105 is provided around the general portion 21 and is continuous with the upper flange portions 35, 57 and 91 of the reinforcing portion 19, and the rib 101 is connected to the vertical wall portion 105 as shown in FIG.
And the vertical wall portion 3 of the vertical wall portion 105 and the reinforcing portion 25
1 and a rib 10 coupled to the lower surface of the upper flange portion 35
3 and the energy absorbing portion 23 is
It has a configuration linked to.

In the reinforcing portion 47 of the hinge 7 on the mounting portion 11 side, the slope 99 of the energy absorbing portion 23 is
7 by a rib 107. Rib 107
Is connected to the vertical wall portion 105 as shown in FIG. 3, and the vertical wall portion 105, the vertical wall portion 53 of the reinforcing portion 47, and the upper flange portion 5
The energy absorbing portion 23 is reinforced by the rib 109 connected to the reinforcing member 7 and is connected to the reinforcing portion 47.

Further, a part of the energy absorbing portion 23 is configured to directly connect the slope 99 to the vertical wall portion 105.

The outer panel 3 is joined to the upper surface of the inner panel 5, and the periphery thereof is formed by upper flange portions 33,3.
5, 55, 57, 89, 91, 71, etc., are assembled by bonding, bolts, rivets, or the like. The apex 97 of the energy absorbing portion 23 is connected to the lower surface of the outer panel 3 by an adhesive 111 or the like.

FIG. 6 is a table showing the cross-sectional structure of the reinforcing portion 19 and the setting of the ribs. In this diagram, (A.
FR portion) is a reinforcing portion 2 in the front portion of the hood 1 on the mounting portion 15 side.
5, (B. side portion FR side) represents the reinforcing portion 77 on the side portion side of the hood 1, and (C. side portion RR side) represents the reinforcing portion 47 on the mounting portion 11 side of the hinge 7.

First, in the schematic cross-sectional view of the skeleton, in A, the bottom wall portion and the upper flange portion are both thick t1,
The vertical wall portion is set to be thin t2. B has almost the same thickness as A. In C, the bottom wall, the upper flange, and the vertical wall are all thin t2. That is, as shown in the middle part, when the vertical thickness is indicated by ×, A, B
Is ○ and C is ×. In the lower rib setting,
Attachment portion 15 side of the lock member and attachment portion 11 of hinge
A and C are ○ as if ribs were set on the side
And B is x.

As shown in the table of FIG. 5, first, in the reinforcing part 25 at the front of the hood 1 on the side of the mounting part 15 of the lock member, the bottom wall 27 and the upper flange parts 33 and 35 are connected to the vertical wall part as described above. It is formed to be thicker than the front and rear vertical wall portions 29,3.
1 are connected by the ribs 43, so that the bending rigidity and the torsional rigidity of the reinforcing portion 25 are increased, and the cross-sectional deformation is suppressed.

In the reinforcing portion 77 on the hood side of B,
The bottom wall 83 and the upper flanges 89 and 91 are connected to the vertical wall 85,
With the structure formed thicker than 87, the bending rigidity and torsional rigidity of the reinforcing portion 77 are increased.

Further, the reinforcement section 47 on the side of the hinge C mounting section 11 is formed so as to have substantially the same thickness in the entire cross section, and the left and right other wall sections 51 and 53 are connected by the rib 75. The structure is such that the bending rigidity is set to be lower than that of the reinforcing portion 77 while suppressing it.

FIG. 6 shows a bending moment distribution of the reinforcing portion 19. (A) is the hinge mounting portion 11, the fragile portion 13, and the locking member mounting portion 1 of the inner panel 5.
FIG. 5 is a plan view showing a contact surface portion 17 of the bumper rubber, and FIG.
(E) shows the bending moment distribution, and (d) and (f) show the stress distribution. (B), (c), and (d) show the case where the right and left bumper rubber contact surfaces 81 of the inner panel 5 are simultaneously subjected to the reaction force from the left and right bumper rubbers 79. (E) and (f) show the bumper rubber 79 on one side.
It is the one when receiving the reaction force from.

As shown in FIG. 5B, the bending strength of the reinforcing portion 25 at the front of the hood 1 and the reinforcing portion 77 at the side of the hood 1 is high, and the reinforcing portion 47 of the hinge 7 at the mounting portion 11 side is high. The bending stiffness is set low.

In general, when the reaction forces from the left and right bumper rubbers 79 enter simultaneously, such as when the hood 1 is closed, a bending moment is also applied to the mounting portion 15 of the lock member as shown in FIG. Occurs, but the reinforcement 2 at the front of the hood 1
5 has a cross section that increases bending rigidity,
Stress (displacement) can also be suppressed as shown in FIG.

The reaction force from the lock member side is
Since the vertical wall portion 31 is connected to the slope portion 99 of the energy absorbing portion 23 via the ribs 103 and 101, a force can be transmitted to the energy absorbing portion 23. In the general portion 21 of the hood inner 5, since the energy absorbing portions 23 are entirely dispersed and arranged, the overall rigidity of the general portion 21 is increased, and the general portion 21 is transmitted to the energy absorbing portion 23 by the rib 101. Can be dispersed throughout the general part 21,
Cross-sectional deformation can be suppressed. In this case, the transmission of the force from the lock member is first transmitted from the striker 9 via the boss portion 37 to the rib 39, and the rib 39 transmits the force to the vertical wall 3.
The above-mentioned dispersion can be performed by transmitting the information to the first node. At this time, the ribs 40, 41 and the like also contribute to the transmission of force, and can reliably transmit the reaction force from the lock member as a whole, and can be reliably dispersed to the general portion 21 side.

Next, as in the case where the left / right adjustment of the bumper rubber 79 is unbalanced, the bumper rubber 79 on one side is not used.
If the reaction force is mainly from the bumper rubber contact surface 8
Since the cross-section is such that the bending rigidity of the reinforcing portion 77 on the side of the hood 1 including the hood 1 is increased, stress (displacement) as shown in (e) and (f) can also be suppressed. Further, since the bottom wall portion 83 of the reinforcing portion 77 is formed to be thick, out-of-plane deformation of the contact surface 81 of the bumper rubber 79 can be suppressed.

In the reinforcing portion 25 at the front of the hood 1, the ribs 43 are arranged so as to intersect.
The torsional rigidity can be further improved, the force can be transmitted more reliably, and the deformation can be further suppressed.
Also in the reinforcing portion 47 of the hinge 7 on the attachment portion 11 side, the ribs 75 are arranged so as to cross, so that the torsional rigidity can be improved, the force can be transmitted more reliably, and the deformation can be suppressed.

In the attachment portion 11 of the hinge 7, the ribs 63 and 67 are connected to the boss portion 59, and the reaction force from the hinge 7 side is applied to the vertical wall portions 51 and 5 via the boss portion 59 and the rib 63.
3, 69, and the like, and can be dispersed to the general portion 21 side and the like by the transmission of the force as described above, and the deformation can be reliably suppressed. In this case, the rib 65 connecting the boss portions 59 also contributes to the transmission of the force,
Deformation can be reliably suppressed.

Further, the reinforcing portion 19 is continuously provided so as to connect the hinge mounting portion 11, the fragile portion 13, the bumper rubber contact surface portion 17, and the lock member mounting portion 15 so as to surround the general portion 21. Therefore, the reaction force from the contact surface 17 of the bumper rubber and the mounting portion 15 of the lock member can be totally dispersed by the reinforcing portion 19 and can be more reliably diffused to the general portion 21 and the like.

From the vertical wall portions 31, 53, 87, etc. of the reinforcing portion 19, a part of the energy absorbing portions 23 is formed via the vertical wall portion 105.
The force can be transmitted directly to the slope 99 of the
1 can be surely diffused, and from this point also, local deformation can be reliably suppressed.

Further, when an out-of-plane force is applied to the outer panel 3 of the hood 1 by wax application or the like, the out-of-plane force enters the apex portion 97 of the energy absorbing portion 23, and passes through the energy absorbing portion 23 to the general portion 23. Can spread the power. Therefore, out-of-plane deformation of the outer panel 3 can be suppressed.

Further, since the rigidity of the reinforcing portion 19 is increased,
The tension rigidity of the outer panel 3 can be improved.

Next, when the hood 1 receives a load F from the front as shown in FIG. 7 at the time of a frontal collision of the vehicle, the bending of the reinforcing portion 25 at the front of the hood 1 and the reinforcing portion 77 at the side of the hood 1 is performed. The rigidity is set to be high, and the reinforcing portion 4 on the attachment portion 11 side of the hinge 7 is provided.
In 7, the ribs 75 connecting the vertical wall portions 51 and 53 are provided to suppress the cross-sectional deformation, so that the fragile portion 13 works reliably, and the stress accompanying the impact force concentrates on the fragile portion 13. As shown by the two-dot chain line in FIG. Therefore, energy absorption can be increased even when the hood 1 is bent at the time of a frontal collision.

FIG. 8 is a sectional view showing another embodiment of the present invention, which is the same as the sectional position shown in FIG. As shown in FIG. 8, in the present embodiment, the vertical wall 8
The thicknesses of 5, 87 are gradually increased up and down with respect to the bending center C of the reinforcing portion 77, and are continuous with the bottom wall portion 83 and the upper flange portions 89, 91. With such a cross-sectional shape, the bending rigidity of the reinforcing portion 77 can be further increased. This cross-sectional structure can also be adopted at the same time as the reinforcing portion 25 at the front of the hood 1, similarly increasing the flexural rigidity of the skeleton, further improving the load distribution as a whole, and further suppressing local deformation. can do.

FIG. 9 is a sectional view showing still another embodiment, and the sectional position is at the fragile portion 13. When the cross section of this portion is shown as the rear end position of the reinforcing portion 77, the lower portions 85b and 87b of the vertical wall portions 85 and 87 are thinner than the upper portions 85a and 87a. (T
_87a , _t85a )> ( _t87b , _t85b ) Due to such a cross-sectional structure, the lower portion of the cross section is deformed as shown by the two-dot chain line in FIG. 9 against the bending deformation of the hood 1 as shown in FIG. Therefore, when the hood 1 is bent at the time of collision, the section modulus can be reduced as needed, and the bending deformation of the mountain shape as shown in FIG. 7 can be further promoted.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a hood according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line SA-SA of FIG.

FIG. 3 is a sectional view taken along the line SB-SB in FIG. 1;

FIG. 4 is a sectional view taken along the line SC-SC in FIG. 1;

FIG. 5 is a table showing a thickness relationship of a reinforcing portion according to the embodiment.

6A is a plan view showing each reinforcing portion, FIG. 6B is a bending rigidity distribution when receiving a reaction force from both side bumper rubbers,
(C) is a bending moment distribution when receiving a reaction force from both side bumper rubbers, (d) is a stress distribution when receiving a reaction force from both side bumper rubbers, and (e) is a reaction force from one side bumper rubber. Moment distribution, (f)
Is a stress distribution when a reaction force is received from one side bumper rubber.

FIG. 7 is an explanatory view showing a bending deformation at the time of a frontal collision according to the embodiment.

FIG. 8 is a cross-sectional view of a reinforcing portion on a side portion of a hood according to another embodiment.

FIG. 9 is a cross-sectional view of a fragile portion according to still another embodiment.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 hood 3 outer panel 5 inner panel 7 hinge 9 striker (locking member) 11 hinge attaching portion 13 fragile portion 15 locking member attaching portion 17 bumper rubber hitting surface portion 19 reinforcing portion 21 inner panel general portion 23 energy absorbing portion 25 Reinforcing portions 27, 49, 83 on the mounting portion side of the lock member Bottom wall portions 29, 31, 51, 53, 85, 87 Vertical wall portions 33, 35, 55, 57, 89, 91 Upper flange portions 37, 59 Boss portions 39, 40, 41, 43, 63, 65, 75, 101,
103, 105, 107 Rib 47 Reinforcing part on hinge mounting part side 77 Reinforcing part on side part of hood 79 Bumper rubber 97 Apex part 99 Slope part

Claims (10)

[Claims] 1. A hood comprising an outer panel and an inner panel, a rear portion in the front-rear direction of the vehicle body is attached to the vehicle body side via a hinge so as to be openable and closable, and a front portion is detachably connected to the vehicle body side via a lock member. In the structure, a mounting portion of the hinge, a vulnerable portion substantially at the center in the vehicle longitudinal direction, a mounting portion of the lock member, and a bumper rubber located between the mounting portion of the vulnerable portion and the lock member are provided on the inner panel. Contact surface, and the mounting portion of these hinges,
A fragile portion, a mounting portion of the lock member, a reinforcing portion of the hood peripheral portion connecting the contact surface portion of the bumper rubber, and a hem-spread energy absorbing portion whose apex portion contacts the outer panel,
A hood structure provided with a connecting rib for connecting the reinforcing portion and a slope portion of the energy absorbing portion. 2. The hood structure according to claim 1, wherein the reinforcing portion is at least a mounting portion side of the lock member, a hinge mounting portion side, and a side portion of the hood between the two mounting portion sides. Hood structure provided in three places. 3. The hood structure according to claim 2, wherein the reinforcing portion on the mounting portion side of the lock member includes a bottom wall portion, a vertical wall portion before and after rising from the bottom wall portion, and an upper end of the vertical wall portion. The upper flange portion and the bottom wall portion are formed thicker than the vertical wall portion, and the front and rear vertical wall portions are connected by ribs. Hood structure. 4. The hood structure according to claim 2, wherein the reinforcing portion on a side portion of the hood includes a contact surface portion of the bumper rubber, and is located on a front side of the fragile portion and a bottom wall portion. And left and right vertical wall portions rising from the bottom wall portion and an upper flange portion provided at an upper end of the vertical wall portion,
A hood structure wherein the upper flange portion and the bottom wall portion are formed thicker than the vertical wall portion. 5. The hood structure according to claim 2, wherein the reinforcing portion on the attachment portion side of the hinge includes the attachment portion of the hinge and is located behind the fragile portion. A bottom wall portion, left and right vertical wall portions rising from the bottom wall portion, and an upper flange portion provided at an upper end of the vertical wall portion, wherein the left and right vertical wall portions are connected by a rib. And hood structure. 6. The hood structure according to claim 3, wherein the rib connecting the vertical wall portions intersects between the vertical wall portions. 7. The hood structure according to claim 3, wherein at least one of the mounting portion of the lock member and the mounting portion of the hinge includes a boss provided on a bottom wall of the reinforcing portion. A hood structure wherein the boss portion and the vertical wall portion of the reinforcing portion are connected by a rib. 8. The hood structure according to claim 1, wherein the energy absorbing portions are disposed so as to be entirely dispersed in a range surrounded by the reinforcing portion. 9. The hood structure according to claim 1, wherein the inner panel is formed of a light metal casting. 10. The hood structure according to claim 1, wherein the outer panel is formed of a resin material.