JP3528486B2 - Hood lifting device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when a running vehicle collides with a pedestrian, the pedestrian after the collision is flipped up,
The present invention relates to a vehicle hood flip-up device that protects a pedestrian by absorbing and mitigating the impact of a secondary collision with the upper surface of the hood when the vehicle falls down on the hood at the front of the vehicle.

[0002]

2. Description of the Related Art The function of this type of hood flip-up device is
When a running vehicle collides with a pedestrian, the rear end of the hood is flipped up to secure a clearance between the structure in the engine room and the hood. It is about absorbing and relaxing shocks. As an example of a conventional hood flip-up device of this type, US Pat.
The one described in No. 249,632 is known.

By the way, in this type of device, it is necessary to bounce up the hood to a fixed position within a very short time before a pedestrian who is a collision partner falls on the hood, so a large bounce force is applied to the hood. Must be given. For example, the acceleration generated by the flip-up force when the rear end of the hood rises may be 10 G (G = gravitational acceleration) or more.

[0004]

However, the conventional hood does not have a structure corresponding to the flip-up force. Therefore, the central part of the hood vibrates up and down during the flip-up, and the flip-up position is increased. There was a problem that it was difficult to control.

This point will be described with reference to the drawings. 14 is a perspective view showing a vibration state of the hood, FIG. 15 is a view showing a vertical displacement of the hood and a time relationship, FIG. 16 is a sectional view of a central portion of the hood, and FIG. 17 is a side view showing a support structure at both left and right ends of the hood. It is a figure.

The hood 1 is formed in a rectangular plate shape as shown in FIG. 14, and at the time of collision, the rear end 1b is flipped up with the front end 1a as a fulcrum. On the lower surface side of the rear end 1a of the hood 1, a hood inner 2 is attached as shown in FIG.

The hood inner 2 is formed by bending a bottom wall 2a arranged parallel to the hood 1, a front vertical wall 2b bent upward from a front end of the bottom wall 2a, and a rear end of the bottom wall 2a. And a rear vertical wall 2c, a front flange 2d that is formed by bending the front vertical wall 2b at the upper end in the forward direction, and a rear flange 2e that is formed by bending backward at the upper end of the rear vertical wall 2c. The cross-sectional shape is such that the rear flange 2e is sandwiched between the bent portions of the hood rear end 1b, and the front flange 2d is joined to the inner surface of the hood 1 using the adhesive 10, so that the rear end of the hood 1 is It is installed.

Since the hood 1 is normally opened for inspection of the engine room and the like, as shown in FIG. 17, a hinge mechanism (coupling means) 5 arranged at the left and right rear ends of the hood 1 is used for the vehicle body 7. Is vertically rotatably connected to. This hinge mechanism 5 is provided at the rear end 1b of the hood at the time of collision.
Is configured to allow a predetermined amount of flipping up.

When a bounce-up force is applied to the hood 1 having such a structure, the hood 1 whose left and right ends are restrained by the hinge mechanism 5 has a central portion as shown in FIGS. 14 and 15.
It repeatedly vibrates up and down and violently vibrates up and down. Therefore, it is difficult to control the flip-up position.

It is also conceivable to reinforce the hood 1 to prevent it. However, if the bending rigidity of the entire hood is simply increased, the collision protection performance with respect to an obstacle that makes a secondary collision with the hood 1 will deteriorate. For this reason,
It is desired to increase the bending rigidity of the hood 1 to some extent and to make it locally crushable.

In view of the above circumstances, it is a first object of the present invention to suppress the vibration of the hood when it is flipped up and to appropriately control the amount of the hood that is flipped up. Second, it is necessary to improve the shock absorption performance due to the local crushing of the hood.
The purpose of.

[0012]

According to a first aspect of the present invention, the left and right rear ends of a hood provided on a front portion of a vehicle are normally restrained at fixed positions, and a certain amount of flip-up is allowed during a collision. In the hood flip-up device including the connecting means for connecting to the vehicle body as described above, the bending rigidity of the hood is increased by substantially connecting the left and right connecting means along the hood inner arranged on the lower surface of the rear end of the hood. With the reinforcement material , the hood inner
A housing having a bottom wall, front and rear vertical walls, and a flange at the upper end of the vertical walls.
It is formed in a hood type cross section and is
The bottom of the hood inner
The wall is placed underneath and separable from the cowl body
Is joined to the cowl upper, and the cowl upper is
It is characterized in that it corresponds to a reinforcing material .

In this device, since the bending rigidity of the hood is increased by the addition of the reinforcing material, the bending amount of the central portion of the hood is reduced. Also, with this device, when the hood is
The cowl upper is lifted up with the hood. Therefore,
The bending rigidity of the hood is increased by the reinforcement effect of the cowl upper.
The height of the hood is reduced, and the amount of bending of the central portion of the hood is reduced.

According to the second aspect of the present invention, the left and right rear ends of the hood provided on the front part of the vehicle are normally restrained at fixed positions and connected to the vehicle body so as to allow a certain amount of flip-up at the time of collision. In a hood flip-up device including a connecting means for connecting the front end of the vehicle and a flip-up drive means for flipping up the rear end of the hood when the front end of the vehicle collides with an obstacle, the hood inner disposed on the lower surface of the rear end of the hood. Along the line, a reinforcing member is arranged to substantially connect the left and right connecting means to enhance the bending rigidity of the hood ,
The hood inner is provided with a bottom wall, front and rear vertical walls, and upper end walls of the vertical walls.
It has a hat-shaped cross section with a lunge and
It is joined to the underside of the hood by the flange, and
The bottom wall of the hood inner is arranged below the cowl and
It is joined with a cowl upper that can be separated from the main body,
The cowl upper corresponds to the reinforcing material .

In this device, since the bending rigidity of the hood is increased by adding the reinforcing material, the bending amount of the central portion of the hood is reduced. Also, with this device, when the hood is
The cowl upper is lifted up with the hood. Therefore,
The bending rigidity of the hood is increased by the reinforcement effect of the cowl upper.
The height of the hood is reduced, and the amount of bending of the central portion of the hood is reduced.

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

As described above, according to the invention of claim 1, since the bending rigidity of the hood is increased by the addition of the reinforcing material, the bending amount of the central portion of the hood is reduced and the vibration at the time of flipping up is reduced. It is reduced and it is easy to control the amount of hood bounce up properly. Also, by cowl upper
Since the hood can be reinforced, a reinforcing material is provided separately
The structure is simple.

According to the second aspect of the present invention, since the bending rigidity of the hood is increased by the addition of the reinforcing material, the bending amount of the central portion of the hood is reduced and the vibration at the time of flipping up is reduced,
This makes it easier to properly control the amount of hood bounce. Also, the hood is reinforced by the cowl upper.
Since there is no need for a separate reinforcing material,
Structure becomes simple.

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In each of the embodiments, the left and right rear ends of the hood are connected to the vehicle body by the connecting means (hinge mechanism) so that the hood is normally restrained at a fixed position and a certain amount of flip-up is allowed at the time of collision. However, the point that the flip-up drive means flips up the rear end of the hood at the time of a collision with an obstacle is the same as the conventional one, so in the following, the hood reinforcement structure and the structure newly added to the hood will be described below. Will be described only.

[First Embodiment] FIGS. 1 (a) and 1 (b) show the configuration of the essential parts of a first embodiment of the present invention.

In the first embodiment, a reinforcing member 21 having a U-shaped cross section with an opening facing forward is provided in the inner space of the hood inner 2 having a hat-shaped cross section. Reinforcement material 21
Are arranged so as to substantially connect the left and right hinge mechanisms (not shown) along the hood inner 2. Reinforcement material 21
Is a vertically inclined vertical wall 21a and upper and lower flanges 21a.
b and 21c, and the insertion piece 21d protruding from the tip of the lower flange 21c, the upper flange 2
1b is joined to the lower surface of the hood (hood outer) 1 with the adhesive 10, and the insertion piece 2 provided on the lower flange 21c.
1d is inserted from the rear into the insertion notch 22 provided in the bottom wall 2a of the hood inner 2. This portion is the insertion engagement portion, and the insertion piece 21d is pulled out rearward (direction of arrow E) from the notch 22, that is, the engagement is released, and the entire reinforcing member 21 functions as a weak portion for energy absorption.

According to this structure, since the reinforcing member 21 for connecting the left and right hinge mechanisms is added inside the hood inner 2, the bending rigidity in the left-right direction of the rear end 1a of the hood 1 is greatly increased. To be Therefore, the bending of the central part of the hood 1 at the time of flipping up is reduced, and the vibration of the central part of the hood 1 is suppressed. As a result, it becomes easy to properly control the amount of flip-up of the hood 1.

Also, if an obstacle falls down on the hood 1,
When a downward impact force P of a predetermined value or more acts on the hood 1, a vertical compressive force acts on the hood inner 2,
The insertion piece 21d is pulled out backward as indicated by arrow E.
That is, the engagement of the insertion engagement portion (insertion piece 21d and insertion notch 22) is released. Therefore, the reinforcing material 2
1 becomes easily deformed (crushed) easily, and the reinforcing material 21
By deforming, the impact energy is effectively absorbed. The impact energy is also absorbed by slippage of the adhesive portion (adhesive 10) on the upper ends of the hood inner 2 and the reinforcing member 21.

In this embodiment, the insertion engaging portion is provided at the joint between the hood inner 2 and the reinforcing member 21,
The joint between the hood 1 and the reinforcement member 21 (in FIG. 1, the reinforcement member 21 is
Even if the upper end of (1) is adhered with the adhesive 10) and is formed by the insertion engaging portion, substantially the same effect can be expected.

[Second Embodiment] FIGS. 2 (a) and 2 (b) show the essential structure of a second embodiment of the present invention.

In the second embodiment, a strip-shaped reinforcing member 31 is provided above the inner space of the hood inner 2 having a hat-shaped cross section.
Is provided. This reinforcing material 31 is used for the hood inner 2
The left and right hinge mechanisms (not shown) are arranged so as to be substantially connected to each other, and are arranged so as to be in close contact with the back surface of the hood 1.

The reinforcing member 31 has a V-shaped bent portion 31b facing downward in the widthwise central portion of the strip-shaped flat plate portion 31a, and is located in front of the V-shaped bent portion 31b (left side in the figure). The flat plate portion 31a of () is adhered to the back surface of the hood 1 with the adhesive 10. The strip-shaped reinforcing member 31 has a width (width along the front-rear direction of the vehicle) set to fit within the hood inner 2, and is bent downward at the front edge and the rear edge of the flat plate portion 31a. The bent pieces 31c and 31d thus formed are joined to the hood inner 2.

On the front and rear vertical walls 2b, 2c of the hood inner 2, a plurality of rectangular joining pieces 34 surrounded by upwardly protruding U-shaped slits 33 are formed.
The c and 31d are inserted into the slit 33 from above and spot-welded to the joining piece 34. 32 indicates a spot welded portion.

According to this structure, since the reinforcing member 31 connecting the left and right hinge mechanisms is arranged along the back surface of the hood 1, the bending rigidity of the rear end 1a of the hood 1 in the left-right direction is improved. Greatly enhanced. In particular, the presence of the V-shaped bent portion 31b increases the geometrical moment of inertia, which greatly improves the bending rigidity. Therefore, the deflection of the central portion of the hood 1 at the time of flipping up is reduced, and the hood 1
The vibration of the central part of the hood 1 is suppressed, and as a result, it becomes easy to properly control the amount of flip-up of the hood 1.

Also, if an obstacle falls down on the hood 1,
If a downward impact force above a certain level acts on the hood 1,
The V-shaped bent portion 31b deforms and absorbs energy, and the joint pieces 34 provided on the vertical walls 2b and 2c of the hood inner 2 function as weak portions for energy absorption.
At the same time, it deforms and absorbs energy. Therefore, although the bending rigidity of the hood 1 is increased by the reinforcing member 31, the effect of absorbing the impact energy when the obstacle collides with the hood 1 is enhanced.

[Third Embodiment] FIGS. 3 (a), 3 (b),
(C) shows the principal part structure of 3rd Embodiment of this invention.

In the third embodiment, the reinforcing member 42 is arranged below the hood inner 2. The reinforcing member 41 is arranged along the hood inner 2 so as to substantially connect the left and right hinge mechanisms (not shown). The reinforcing member 42 has a substantially trapezoidal cross section, a bottom wall 41a parallel to the bottom wall 2a of the hood inner 2, a front vertical wall 41b that is bent upward from a front end edge of the bottom wall 41a, and is inclined forward. A rear vertical wall 41c bent upward from the rear edge of the bottom wall 41a and a flange 41 bent inward from the upper edge of the front vertical wall 41b.
d and an insertion piece 41e extending inward from the tip of the flange 41a. The reinforcing member 41 is spot-welded by bringing the upper end of the rear vertical wall 41c into close contact with the rear vertical wall 2c of the hood inner 2 (spot weld portion 44), and
The flange 41d is arranged along the lower surface of the bottom wall 2a of the hood inner 2, and the insertion piece 41e is inserted into the insertion notch 43 on the hood inner 2 side from the front, whereby the hood inner 2 is attached to the lower side. Further, as shown in FIG. 3C, the cross section is reduced at both ends in the width direction of the vehicle and spot welded to the hood inner 2 (spot weld portion 45).

The insert piece 41e and the insert notch 4
The insertion portion formed by 3 is the insertion engagement portion, and the insertion piece 41ed is pulled out forward from the notch 43 on the hood inner 2 side, that is, the engagement is released, so that the entire reinforcing member 41 functions as a weak portion for energy absorption. It should be noted that instead of the insertion engagement, the adhesive may be used for joining.

According to this structure, since the reinforcing member 41 having a trapezoidal cross section is arranged in the lower portion of the hood inner 2, the bending rigidity of the rear end 1a of the hood 1 is increased due to the increase in the cross sectional area. Therefore, regarding the control of the amount of flip-up, the same effect as that of the first embodiment can be expected.

Also, if an obstacle falls down on the hood 1,
As shown in FIG. 4, when a downward impact force P of a predetermined amount or more acts on the hood 1, the lower surface of the reinforcing member 41 having a trapezoidal cross-section hits the vehicle body 7, so that the insertion piece 41e causes the arrow F to move.
Exit forward like. That is, the engagement of the insertion engagement portion (insertion piece 41e and insertion notch 43) is released. Therefore, the entire reinforcing material 41 is easily deformed (crushed) easily, and the deformation of the reinforcing material 41 effectively absorbs the impact energy.

[Fourth Embodiment] FIGS. 5 (a) and 5 (b) show the configuration of the essential parts of a fourth embodiment of the present invention.

In the fourth embodiment, the rear end 1a of the hood is
Upper cowl 5 of cowl box 50 existing below
1 is used as a reinforcing material. That is, in this case, the cowl upper 51 is configured to be separable from the cowl body 52 so that the cowl upper 51 is lifted up together with the hood 1 when the hood is flipped up.

Since the cowl box 50 normally functions as an air intake, the cowl upper 5
1 is in close contact with the cowl body 52 via sealing rubbers 54 and 55. The cowl upper 51 extends in the left-right direction along the hood inner 2 and is formed in a V shape in cross section.
Vertical wall 51a and horizontal wall 51 extending rearward from the upper edge of the vertical wall 51a
b and a flange 51c provided on the lower edge of the vertical wall 51a
And a flange 51d provided on the rear edge of the horizontal wall 51b
It has and. The flanges 51c and 51d are normally
It is in close contact with the cowl body 52 side via the sealing rubbers 54 and 55.

Then, here, the horizontal wall 51b of the cowl upper 51 is spot-welded to the lower surface of the bottom wall 2a of the hood inner 2 (spot welding portion 53), and the hood inner 2 is formed.
Is integrated into.

According to this structure, in addition to the hood inner 2, the cowl upper 51 reinforces the rear end 1a of the hood 1, so that the bending rigidity of the rear end 1a of the hood is increased. Therefore,
The amount of bending of the central portion of the hood 1 at the time of flipping up is reduced, the vibration at the time of flipping up is reduced, and it becomes easier to properly control the amount of flipping up of the hood 1.

[Fifth Embodiment] FIG. 6 is a sectional view showing the arrangement of the essential parts of the fifth embodiment of the present invention.

In this embodiment, the central portion in the left-right direction of the hood inner 2 is a strip plate (or belt) 63 having a predetermined length as a flip-up amount regulating member, and is attached to the cowl upper 51 of the cowl box 50 which is a vehicle body side member. It is connected. In this case, the length of the strip 63 is set to correspond to the amount of flip-up of the hood 1, and the upper end of the hood 1 has the front vertical wall 2b of the hood inner 2.
It is joined to the cowl upper 5 by the bolt nut 65 and the lower end.
The one vertical wall 51a is joined with a bolt nut 65.

Further, a reinforcing member 61 is disposed on the inner bottom portion of the hood inner 2 to substantially connect between hinge mechanisms (not shown). The reinforcing member 61 is formed in a U-shaped cross section along the inner bottom portion of the hood inner 2, and has a bottom wall 61a and a front vertical wall 61.
b, the rear vertical wall 61c closely adheres to the bottom wall 2a, the front vertical wall 2b, and the rear vertical wall 2c of the hood inner 2, respectively, and the front vertical walls 61b and 2b are joined to each other by spot welding. The walls 61c, 2c are joined to each other by spot welding, so that they are integrated with the hood inner 2. 62 is a spot weld.

According to this structure, the central portion of the rear end 1a of the hood 1 in the left-right direction is a strip plate 63 which is a flip-up amount regulating member.
Since it is connected to the vehicle body side via the band plate 63, the amount of flip-up of the rear end of the hood 1 at the center in the left-right direction is restricted by the strip plate 63. Therefore, the vertical vibration of the central portion of the hood 1 is unlikely to occur, and it is easy to properly control the amount of flip-up. Further, since the reinforcing material 61 is added, the bending rigidity of the hood 1 is increased, and thus the vibration suppressing effect of the central portion of the hood 1 is enhanced.

[Sixth Embodiment] FIG. 7 is an exploded perspective view of an essential part of a sixth embodiment of the present invention, FIG. 8A is a perspective view showing a state before flipping up, and FIG. It is a perspective view which shows the state after raising. The sixth embodiment is a modification of the fifth embodiment.

In the sixth embodiment, the strip plate 63 of the fifth embodiment is used in a folded state, and the upper end of the strip plate 63 is connected with a screw 64 to form a rectangular joint provided on the front vertical wall 2b of the hood inner 2. It is joined to the piece 67. This rectangular joining piece 6
7 is an upward U-shaped slit 66 formed on the vertical wall 2b.
It is surrounded by, and only the lower end edge is connected to the vertical wall 2b. Others are the same as the fifth embodiment.

The reinforcing member 61 may be provided if necessary, and when provided, the joint piece 67 may be fastened together with the screw 64. In addition, the length of the strip 63 is set such that the hood 1 is in a state where the joining piece 67 is bent downward as shown in FIG. 8B.
The size is set such that the rear end 1a (see FIG. 6) rises by a predetermined amount.

In this structure, when the hood is flipped up, the band plate 63 regulates the amount of rise of the central portion of the hood, so that the hood does not bounce more than a predetermined amount. In this case, the strip 63
Since the upper end of the joining piece is joined to the joining piece 67 surrounded by the slit 66, the joining piece 67 is moved downward as shown in FIG. After being peeled off, the rising of the hood is restricted by the strip 63 in that state.

Therefore, the vibration absorbing action due to the deformation of the joining piece 67 can further suppress the vibration of the central portion of the hood. Further, since the vertical wall 2b of the hood inner 2 has a hole, this portion functions as a weak portion for energy absorption, and the energy absorption performance at the time of a secondary collision of the obstacle with the hood is further enhanced.

[Seventh Embodiment] FIG. 9 is an exploded perspective view showing a main structure of a seventh embodiment of the present invention. The seventh embodiment is a modification of the sixth embodiment.

In the seventh embodiment, the front vertical wall 2b of the hood inner 2 is provided with a plurality of joint pieces 67 surrounded by a U-shaped slit 66 and arranged at intervals. And
A strip-shaped reinforcing member 68 is arranged on the outer surface of the vertical wall 2b, and the reinforcing member 68 is joined to each joining piece 67 with a screw 64. Further, the upper end of the strip plate 63 as a flip-up amount restricting member is joined to one joining piece 67 with a screw 64 via a reinforcing material 68. Other configurations are similar to those of the sixth embodiment.

According to this structure, since all the joining pieces 67 are connected by the strip-shaped reinforcing member 68, the tensile force acting on the strip plate 63 at the time of flipping up makes all the joining pieces 67 through the reinforcing member 68. 67, all the joining pieces 67 are deformed so as to be peeled from the vertical wall 2b of the hood inner 2. Therefore, the effect of reducing the speed at which the hood is flipped up is enhanced, and the vibration suppressing action of the hood at the time of flipping up is improved. Further, since many holes are formed in the vertical wall 2b of the hood inner 2, the energy absorption characteristic at the time of the secondary collision of the obstacle is further improved.

[Eighth Embodiment] FIG. 10 is an exploded perspective view showing a configuration of a main part of an eighth embodiment of the present invention.

In the eighth embodiment, the U-shaped slit in the sixth embodiment is formed in a convex upward chevron shape. That is, by providing the mountain-shaped slit 66b on the vertical wall 2b of the hood inner 2, the mountain-shaped joint piece 67b surrounded by the slit 66b is formed.
The upper end of the strip plate 63 as a flip-up amount restricting member is joined to the 7b with a screw 64.

The operation and effect of this embodiment are substantially the same as those of the sixth embodiment.

[Ninth Embodiment] FIG. 11 is a sectional view showing the arrangement of the main parts of the ninth embodiment of the present invention.

In the ninth embodiment, a flat reinforcing member 71 is joined to the upper surface of a thin hood inner 2 having a hat-shaped cross section to make the hood inner 2 have a closed cross-sectional shape and the bottom of the hood inner 2. A flat plate-shaped reinforcing member 75 is arranged on the upper surface of the wall 2a to reinforce the bottom wall 2a, and the second moment of area of the hood inner 2 is increased. Contrary to this, the vertical walls 2b, 2c are not reinforced at all and are made to function as weak portions for energy absorption. The reinforcing member 71 on the upper side is spot-welded (spot-welded portions 72, 73) to the upper surfaces of the flanges 2d, 2e of the hood inner 2 and is joined to the back surface of the hood (hood outer) 1 with the adhesive 10.

According to this structure, due to the reinforcing effect of the hood inner 2, it is possible to suppress the vibration of the central portion of the hood when the hood is flipped up. Further, when the obstacle collides with the upper surface of the hood 2 for a second time, the adhesive 10 is peeled off,
Since the vertical walls 2b and 2c of the hood inner 2 are crushed,
The initial deceleration due to the collision can be increased, and the impact energy can be efficiently absorbed.

[Tenth Embodiment] FIG. 12 shows the first embodiment of the present invention.
It is sectional drawing which shows the principal part structure of 0th Embodiment.

In the tenth embodiment, the hood inner 2
A reinforcing member 81 is arranged on the inner bottom portion of the. This reinforcement 81
Is a bottom plate 8 by bending one strip in the width direction.
1a and a vertical plate 81b inclined forward are formed in an L-shaped cross section. Then, the reinforcement 81 is spot-welded onto the bottom wall 2a of the hood inner 2 by the bottom plate 81a in a posture in which the vertically inclined vertical plate 81b is directed toward the front vertical wall 2b of the hood inner 2 (spot welding portion 82). ).

Further, here, the height dimension H1 of the vertical plate 81b with the reinforcing member 81 attached to the bottom wall 2a of the hood inner 2 and the base end of the vertical plate 81b (the bent portion of the reinforcing member 81). ) The relationship of the dimension S1 from 81c to the front vertical wall 2b of the hood inner 2 is S1> H1. This is to prevent the tip of the vertical plate 81b from sticking to the vertical wall 2b of the hood inner 2 when the vertical plate 81b is deformed as shown by the dotted line. That is, the reinforcement member 81 can be completely deformed in the hood inner 2.

According to this structure, since the reinforcing member 81 for connecting the left and right hinge mechanisms is added inside the hood inner 2, the bending rigidity of the rear end 1a of the hood 1 in the left-right direction is greatly increased. To be Therefore, the bending of the central portion of the hood 1 at the time of flipping up is reduced, the vibration of the central portion of the hood 1 is suppressed, and as a result, it becomes easy to properly control the amount of flipping up of the hood 1.

In addition, when an obstacle falls on the hood 1,
When a downward impact force P of a predetermined value or more acts on the hood 1, a vertical compressive force acts on the hood inner 2,
As the hood inner 2 is deformed, the vertical plate 8 of the reinforcing member 81
1b is transformed like a dotted line. Therefore, the hood inner 2
The impact energy is absorbed by the deformation of and the deformation of the reinforcing member 81.

[Eleventh Embodiment] FIG. 13 shows the first embodiment of the present invention.
It is sectional drawing which shows the principal part structure of 1st Embodiment.

In the eleventh embodiment, the hood inner 2
A reinforcing member 91 having an inverted U-shaped cross section is disposed on the inner bottom of the.
The reinforcing material 91 is generated by bending a strip plate in the plate width direction, and is provided at the lower end of each of the upper plate 91a, the front and rear leg plates 91b and 91c that open outward, and the front and rear leg plates 91b and 91c. It is provided with flanges 91d and 91e. Then, the front leg plate 91b is attached to the front vertical wall 2b of the hood inner 2.
The reinforcement 91 is spot-welded on the bottom wall 2a of the hood inner 2 by the rear flange 91e in a posture facing toward (spot weld portion 92).

Also, here, the leg plates 91b, 9 with the reinforcing member 91 mounted on the bottom wall 2a of the hood inner 2 are provided.
The relationship between the height dimension H2 of 1c and the dimension S2 from the front flange 91d to the front vertical wall 2b of the hood inner 2 is approximately S2> 2 × H2. This is the reinforcement 91
This is to prevent the tip from being caught in the vertical wall 2b of the hood inner 2 when is deformed as shown by the dotted line. That is, the reinforcement member 91 can be completely deformed in the hood inner 2.

Similar to the tenth embodiment, this structure also has the effect of suppressing the vibration of the central portion of the hood and the effect of absorbing the shock when the obstacle collides secondarily.

In the above embodiment, USP 4.249.
Although the rear end of the hood is forcibly flipped up by using the airbag at the time of a vehicle collision like No. 632, the rear end of the hood is connected to the vehicle by the connecting means without using a special flip-up device. Of course, the present invention can be applied as long as it rises at the time of a collision.

[Brief description of drawings]

FIG. 1 shows a main part configuration of a first embodiment of the present invention,
(A) is sectional drawing of the center part of a hood, (b) is a principal part exploded perspective view of (a), (a) is an Ia-Ia arrow view of (b).

FIG. 2 shows a main part configuration of a second embodiment of the present invention,
(A) is sectional drawing of the center part of a hood, (b) is a principal part disassembled perspective view of (a).

FIG. 3 shows a main part configuration of a third embodiment of the present invention,
(A) is sectional drawing of the central part of a hood, (b) is a principal part exploded perspective view of (a), (c) is IIIc-IIIc arrow sectional drawing of (a).

FIG. 4 is a sectional view for explaining the operation of the third embodiment of the present invention.

5A and 5B are cross-sectional views showing a main part configuration of a fourth embodiment of the present invention, FIG. 5A is a diagram showing a normal state and FIG. 5B is a diagram showing a state of flipping up.

FIG. 6 is a cross-sectional view showing the configuration of the main parts of a fifth embodiment of the present invention.

FIG. 7 is an exploded perspective view showing a configuration of a main part of a sixth embodiment of the present invention.

8A and 8B are perspective views showing a main part configuration of a sixth embodiment of the present invention, FIG. 8A is a diagram showing a state before flipping up, and FIG. 8B is a diagram showing a state after flipping up.

FIG. 9 is an exploded perspective view showing a main part configuration of a seventh embodiment of the present invention.

FIG. 10 is an exploded perspective view showing a main configuration of an eighth embodiment of the present invention.

FIG. 11 is a cross-sectional view showing the main configuration of a ninth embodiment of the present invention.

FIG. 12 is a cross-sectional view showing the main configuration of a tenth embodiment of the present invention.

FIG. 13 is a cross-sectional view showing the main configuration of an eleventh embodiment of the present invention.

FIG. 14 is a perspective view of a hood used for explaining a problem in the conventional hood flip-up device.

FIG. 15 is a characteristic diagram showing vibration of the central portion when the hood is flipped up in the conventional hood flip-up device.

16 is a cross-sectional view taken along the line XVI-XVI of FIG.

17 is a cross-sectional view taken along the arrow XVII-XVII in FIG.

[Explanation of symbols]

1 Hood (hood outer) 1a rear end 2 Food Inner 2a bottom wall 2b Front vertical wall 2c Rear vertical wall 2d front flange 2e Rear flange 5 Hinge mechanism (connecting means) 7 car body 21 Reinforcement material 22 Notch for insertion 31 Reinforcement material 32 Spot welds (joints) 33 slits 41 Reinforcement material 43 Notch for insertion 44 Spot weld (joint) 51 cowl upper (reinforcing material) 51a Vertical wall (vertical wall) 52 cowl body 61 Reinforcement material 63 Strip plate (bounce amount regulation member) 65 screws (joint) 66, 66b slit 68 Reinforcement material 71, 75, 81, 91 Reinforcing material

Continuation of the front page (56) Reference JP-A-7-285465 (JP, A) JP-A-3-25084 (JP, A) Actual opening 1-14-1428 (JP, U) Actual opening Sho 62-30979 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 25/10

Claims (2)

(57) [Claims] 1. A connecting means for connecting the left and right rear ends of a hood provided at a front part of a vehicle to a fixed position in a normal state and connecting to a vehicle body so as to allow a certain amount of flip-up in a collision. In the hood flip-up device, along the hood inner arranged on the lower surface of the rear end of the hood,
A reinforcing member is provided to substantially connect the left and right connecting means to enhance the bending rigidity of the hood, and the hood inner is attached to the bottom wall and the front and rear.
Hat-shaped cross section having a vertical wall and a flange at the upper end of the vertical wall
Is formed on the lower surface of the hood by the flange.
Further, the bottom wall of the hood inner is
A cow arranged on the lower side and separable from the cowl body
The upper cowl is joined to the upper and the cowl upper is joined to the reinforcement.
Hood pop-up device, characterized in that those are. 2. A connecting means for connecting the left and right rear ends of a hood provided at a front part of the vehicle to a fixed position in a normal state and connecting to a vehicle body so as to allow a certain amount of flip-up in a collision, When the front end of the vehicle collides with an obstacle, in a hood flip-up device having a flip-up drive means for flipping up the rear end of the hood, along a hood inner arranged on the lower surface of the rear end of the hood,
A reinforcing member is provided to substantially connect the left and right connecting means to enhance the bending rigidity of the hood, and the hood inner is attached to the bottom wall and the front and rear.
Hat-shaped cross section having a vertical wall and a flange at the upper end of the vertical wall
Is formed on the lower surface of the hood by the flange.
Further, the bottom wall of the hood inner is
A cow arranged on the lower side and separable from the cowl body
The upper cowl is joined to the upper and the cowl upper is joined to the reinforcement.
Hood pop-up device, characterized in that those are.