JP6947230B2 - Vehicle hood - Google Patents

Description

The present invention relates to a vehicle hood comprising an outer panel and an inner panel joined to the outer end thereof.

Conventionally, a hood structure has been known in which the inner panel of a vehicle hood (bonnet, engine hood) has a ridge-like raised shape to improve pedestrian protection performance while ensuring rigidity. .. That is, a raised portion extending in the vehicle width direction is formed on the inner panel, and the top surface of the raised portion is adhered and fixed to the outer panel with a mastic resin or the like. By providing the raised portion, the absorption performance of the impact energy input to the vehicle hood can be improved (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-060398

However, the above-mentioned vehicle hood structure has a problem that it is difficult to improve the bending rigidity in the vehicle front-rear direction. For example, in a vehicle hood in which a grill or a decorative panel is fixed to a front end portion, the dimensions in the front-rear direction of the vehicle tend to be large, and the bending rigidity tends to be insufficient. Further, when an aluminum alloy panel material is used for weight reduction, the bending rigidity tends to be insufficient as compared with the case where a steel plate is used. On the other hand, if the plate thickness of the panel is increased in order to increase the flexural rigidity, the impact energy absorption performance may be lowered. As described above, there is room for improvement in the vehicle hood from the viewpoint of improving the impact energy absorption performance while ensuring the flexural rigidity.

One of the purposes of this case is to provide a vehicle hood with improved impact energy absorption performance while ensuring bending rigidity, which was devised in view of the above problems. Not limited to this purpose, it is also possible to exert an action / effect derived from each configuration shown in the “mode for carrying out the invention” described later, which cannot be obtained by the conventional technique. It can be positioned as a purpose.

(1) The disclosed vehicle hood relates to a vehicle hood including an outer panel, an inner panel joined to a peripheral end portion of the outer panel, and a hood lock device. The vehicle hood extends along each end and the rear end of the inner panel in the vehicle left-right direction, and extends on the outer moat portion having a shape that is convex away from the outer panel and on the bottom surface of the outer moat portion. It is provided with a striker fixing portion that is connected in series and to which the striker of the hood lock device is fixed. Further, an opening provided in the inner panel behind the striker fixing portion, an annular portion provided in an annular shape along the periphery of the opening and adhered to the lower surface of the outer panel, and the above. It is provided with an island portion having an annular portion as a top surface and having a shape that is convex toward the outer panel. Further, the first terrace portion that surrounds the entire circumference of the island portion and forms a terrace-shaped first terrace surface with the outer moat portion, and the annular portion and the first terrace surface are cut in a slit shape. It has an island shape and is provided with island slits arranged radially with respect to the opening.
Further, a grill attached to the front end of the vehicle hood, a grill support portion for supporting the back surface of the grill attached at the front end portion of the outer panel, and a terrace-shaped grill step hill at a position lower than the striker fixing portion. A surface is formed, and the front end portion of the inner panel is provided with a grill reinforcing portion connected to the front end side of the grill support portion. The outer moat portion is provided so as to extend from each end of the inner panel in the left-right direction of the vehicle toward the striker fixing portion, and branched from the first bottom surface toward the grill terrace surface. It has a second bottom surface that is extended.

(2) It is preferable that a large number of the island slits are arranged on the front side of the vehicle rather than on the rear side of the vehicle.
(3) It is preferable to provide a second terrace portion that forms a terrace-shaped second terrace surface between the striker fixing portion and the first terrace surface.
(4) It is preferable to have a terrace slit having a shape obtained by cutting between the first terrace surface and the second terrace surface in a slit shape and extending along the inclination direction of the terrace cliff.
(5) It is preferable that the second terrace portion is arranged in front of the vehicle with respect to the first terrace portion, and the terrace slit extends in the front-rear direction of the vehicle.

While ensuring the flexural rigidity of the entire vehicle hood at the outer moat, the structure of the island and first terrace surrounded by the outer moat can be softened. Further, by extending the island slits radially with respect to the opening of the island, the impact energy absorption performance can be improved.

It is an exploded perspective view of the vehicle hood. It is a perspective view of an inner panel. It is a schematic top view of the inner panel. (A) to (D) are sectional views of a vehicle hood.

Hereinafter, the vehicle hood 10 as an embodiment will be described with reference to the drawings. The embodiments shown below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in the following embodiments. Each configuration of the present embodiment can be variously modified and implemented without departing from the gist thereof. In addition, it can be selected as needed, or can be combined as appropriate.

[1. Device configuration]
The vehicle hood 10 shown in FIG. 1 is a member that covers the upper surface of the engine room so as to be openable and closable, and is rotatably and pivotally supported by a hinge (not shown) with respect to the vehicle body. The vehicle hood 10 is provided with an outer panel 1, an inner panel 2 joined to the outer end portion thereof, and a striker 4 of a hood lock device. The outer panel 1 and the inner panel 2 are made of an aluminum alloy panel material. The hood lock device is a locking device for maintaining the closed state of the vehicle hood 10. On the vehicle body side, a lock device (not shown) that engages with the striker 4 fixed to the vehicle hood 10 is provided.

A plate-shaped grill 14 (decorative panel) is attached to the front end (front end portion, tip end) of the vehicle hood 10. Further, the front end portion of the outer panel 1 is provided with a grill support portion 15 that supports the back surface of the grill 14 attached to the front end portion. A grill reinforcing portion 16 is provided at the front end portion of the inner panel 2 so as to correspond to this. The grill reinforcing portion 16 is connected to the front end side (lower end side) of the grill support portion 15 by welding, hemming, or the like.

As shown in FIG. 2, the inner panel 2 has an outer moat portion 3, a striker fixing portion 5, an opening 6, an annular portion 7, an island portion 8, a first terrace portion 11, a second terrace portion 12, and a grill reinforcing portion 16. Is provided. The outer moat portion 3 is a portion extending along each end portion and the rear end portion of the inner panel 2 in the vehicle left-right direction, and has a downwardly convex cross-sectional shape (a shape protruding in a direction away from the outer panel 1). The shape is convex away from the outer panel 1). In the present embodiment, as shown in FIGS. 4 (B) and 4 (C), the cross-sectional shape of the outer moat portion 3 is a trapezoidal shape in which the lower bottom is shorter than the upper bottom.

The striker fixing portion 5 is a flat portion to which the striker 4 is fixed. The position of the striker fixing portion 5 is set behind the grill reinforcing portion 16. Further, the grill reinforcing portion 16 is formed with a terrace-shaped grill stepped hill surface 23 at a position lower than that of the striker fixing portion 5. By providing a step-like step consisting of the striker fixing portion 5 and the grill terrace surface 23, the gap (deformation allowance) between the outer panel 1 and the inner panel 2 at the front end of the vehicle hood 10 is increased, and the pedestrian's gap (deformation allowance) is increased. Protective performance is improved.

As shown in FIG. 3, the outer moat portion 3 located at each end of the inner panel 2 in the left-right direction of the vehicle is formed in a shape branched into two in front of the vehicle. The bottom surface of the outer moat portion 3 has a shape branched into a first bottom surface 24 connected to the striker fixing portion 5 and a second bottom surface 25 connected to the grill terrace surface 23 of the grill reinforcing portion 16. The first bottom surface 24 extends from each end of the inner panel 2 in the left-right direction of the vehicle toward the striker fixing portion 5, and is continuously provided with the striker fixing portion 5. Similarly, the second bottom surface 25 extends from each end in the left-right direction of the vehicle toward the grill terrace surface 23, and is continuously provided on the grill terrace surface 23. As a result, each end of the grill reinforcing portion 16 in the vehicle left-right direction is also reinforced by the outer moat portion 3, and the bending rigidity in the vehicle front-rear direction is improved.

Three openings 6 are provided on the rear side of the vehicle with respect to the striker fixing portion 5 of the inner panel 2. The arrangement direction of these openings 6 is the vehicle width direction. An annular portion 7 is formed around each opening 6 so as to be adhered to the lower surface of the outer panel 1 with a mastic resin or the like. The annular portion 7 is provided in an annular shape along the periphery of the opening 6. Further, the inner panel 2 has a convex cross-sectional shape (a shape protruding toward the outer panel 1 and convex toward the outer panel 1) with the annular portion 7 as the top surface. Three islands 8 are provided. As shown in FIG. 4D, the cross-sectional shape of the island portion 8 is a trapezoidal shape in which the upper base is shorter than the lower base.

Around the three islands 8, a first terrace 11 and a second terrace 12 are provided. The first terrace portion 11 is a portion forming a terrace-shaped first terrace surface 21 with respect to the bottom surface of the outer moat portion 3, and the second terrace portion 12 is between the striker fixing portion 5 and the first terrace surface 21. It is a part that forms a terrace-shaped second terrace surface 22. As shown in FIG. 2, the three islands 8 have a shape that rises upward from one terrace surface 21. Further, a down step is formed in front of the first terrace surface 21, and the second terrace surface 22 is arranged. As shown in FIG. 4C, by forming a step-like step down in the front-rear direction of the vehicle in multiple stages, the inner panel 2 is easily deformed, and the pedestrian protection performance is improved.

Further, around the island portion 8, island portion slits 9 arranged radially with respect to the opening portion 6 are provided. As shown in FIG. 2, the island slit 9 is a portion having a shape obtained by cutting a portion from the annular portion 7 to the first terrace surface 21 into a slit shape (longitudinal rectangular shape). The extending direction of the island slit 9 is the same as the inclination direction (the direction in which the downward inclination angle is maximum) on the inclined surface between the annular portion 7 and the first terrace surface 21. By arranging the island portion slit 9 in this way, the island portion 8 is easily deformed by a load in the vertical direction, and the pedestrian protection performance is improved.

The layout of the island slit 9 with respect to the opening 6 is biased toward the front of the vehicle. For example, the number of island slits 9 arranged in front of the opening 6 is set to the rear of the opening 6, such as the islands 8 located at the left and right ends of the three islands 8 shown in FIG. The number is larger than the number of island slits 9 to be arranged. With such an arrangement of the island portion slit 9, the amount of deformation on the front side of the island portion 8 is likely to increase more than the amount of deformation on the rear side. Therefore, the structure is easily deformed with respect to the upper surface of the vehicle hood 10 with respect to the load input from the front of the vehicle, and the protection performance against pedestrians in front of the vehicle is improved.

Similarly, a terrace slit 13 is formed between the first terrace portion 11 and the second terrace portion 12. The terrace slit 13 is a portion having a shape obtained by cutting a portion from the first terrace surface 21 to the second terrace surface 22 in a slit shape. The extending direction of the terrace slit 13 is the same as the inclination direction on the inclined surface between the first terrace surface 21 and the second terrace surface 22. Since the second terrace portion 12 is arranged in front of the vehicle with respect to the first terrace portion 11, the extension direction of the terrace slit 13 is generally in the front-rear direction of the vehicle. Further, the layout of the terrace slits 13 is biased toward the front of the vehicle with respect to the first terrace portion 11. As a result, the upper surface of the vehicle hood 10 is easily deformed with respect to the load input from the front of the vehicle, and the protection performance against pedestrians in front of the vehicle is improved.

[2. Action, effect]
As shown in FIG. 4A, the vehicle hood 10 is in a posture in which the inner panel 2 is tilted so that the height difference of the inner panel 2 in the vehicle front-rear direction becomes larger than a predetermined dimension (for example, 100 mm). It is arranged and a gap between it and the outer panel 1 is secured. Further, each end portion and the rear end portion of the inner panel 2 in the vehicle left-right direction are surrounded by an outer moat portion 3 having a convex shape away from the outer panel 1. As shown in FIG. 4B, the closed cross-sectional space sandwiched between the outer moat portion 3 and the outer panel 1 functions as a skeletal structure for ensuring rigidity in the vicinity of the outer end portion of the vehicle hood 10. do. Further, as shown in FIGS. 2 and 3, the outer moat portion 3 extends toward the grill terrace surface 23 of the grill reinforcing portion 16 and reaches the front end of the inner panel 2. Therefore, the rigidity is three-dimensionally ensured in the entire area including the front end of the vehicle hood 10.

As shown in FIG. 4C, the inner panel 2 has a cross-sectional structure in the shape of a step down toward the front of the vehicle. Such a stepped structure of the inner panel 2 is effective in securing the amount of deformation of the vehicle hood 10 in that the contact surface with the outer panel 1 when an external force acts is reduced. Further, since the height difference of the inner panel 2 in the vehicle front-rear direction is larger than the predetermined dimension, it becomes easy to set a large number of steps of the stairs.

As shown in FIG. 4D, the inner panel 2 has a structure in which a plurality of island portions 8 are surrounded by one first terrace portion 11. In other words, it has a structure in which a plurality of islands 8 are bulged from one first terrace surface 21. As a result, for example, when a load is applied to one island portion 8, the deformation of the island portion 8 is transmitted to the adjacent island portion 8, and the entire inner panel 2 is easily displaced. That is, the individual islands 8 are not displaced in an independent state, but are easily deformed in the entire area of the inner panel 2 by interlocking the displacements with each other, and the pedestrian protection performance is improved.

As shown in FIG. 2, the island slits 9 are arranged radially with respect to the opening 6. As a result, the rigidity of the island portion 8 with respect to the load in the vertical direction is reduced, and the reaction force with respect to the load input to the upper surface of the inner panel 2 is reduced. Further, the layout of the island slit 9 is biased toward the front of the vehicle. As a result, the amount of deformation on the front side of the island portion 8 is likely to increase more than the amount of deformation on the rear side. The same applies to the terrace slit 13, and since the arrangement is biased toward the front of the vehicle with respect to the first terrace 11, the amount of deformation on the front side of the first terrace 11 increases more than the amount of deformation on the rear side. It will be easier. That is, a structure that is easily deformed with respect to the upper surface of the vehicle hood 10 with respect to the load input from the front of the vehicle is easily realized.

(1) The outer moat portion 3 is formed at each end portion and the rear end portion of the inner panel 2 in the vehicle left-right direction, and the entire circumference of the island portion 8 in which the opening portion 6 and the annular portion 7 are formed is formed by the first terrace portion 11. By surrounding the hood 10, the structure of the central portion surrounded by the outer moat portion 3 can be softened while ensuring the rigidity in the entire area of the vehicle hood 10, and the protection performance of pedestrians can be improved. Further, the rigidity of the island portion 8 with respect to the load in the vertical direction can be reduced, and the reaction force with respect to the external force input to the upper surface of the inner panel 2 can be reduced. Thereby, the protection performance of the pedestrian can be further improved.

(2) In the inner panel 2 described above, a large number of island slits 9 are arranged on the vehicle front side of the opening 6 on the vehicle front side rather than on the vehicle rear side. As a result, the upper surface of the vehicle hood 10 can be easily deformed by a load input from the front of the vehicle, and the protection performance against pedestrians in front of the vehicle can be further improved.
(3) The inner panel 2 is provided with a terrace-shaped second terrace surface 22 between the striker fixing portion 5 and the first terrace surface 21. The second terrace surface 22 is a down step formed in front of the first terrace surface 21. With such a staircase structure, the inner panel 2 is easily deformed, and the pedestrian protection performance can be further improved.

(4) In the above inner panel 2, since the terrace slit 13 is formed between the first terrace portion 11 and the second terrace portion 12, the rigidity of the second terrace portion 12 can be reduced. Further, since the relative displacement of the first terrace portion 11 with respect to the second terrace portion 12 is easily allowed, the structure between the first terrace portion 11 and the second terrace portion 12 can be softened, and walking can be performed. The protection performance of the person can be further improved.
(5) As shown in FIG. 2, the second terrace portion 12 is arranged in front of the vehicle with respect to the first terrace portion 11, and the extension direction of the terrace slit 13 is the vehicle front-rear direction. As a result, it is possible to easily realize a structure in which the upper surface of the vehicle hood 10 is easily deformed by a load input from the front of the vehicle, and it is possible to further improve the protection performance against pedestrians in front of the vehicle.

(6) As shown in FIG. 3, the bottom surface of the outer moat portion 3 has a shape branched into a first bottom surface 24 and a second bottom surface 25. The first bottom surface 24 functions to increase the rigidity around the hood lock device by supporting the striker fixing portion 5 with the above-mentioned skeleton structure. On the other hand, the second bottom surface 25 functions to increase the rigidity around the grill 14 by supporting the grill reinforcing portion 16 with a skeleton structure. With such a branch structure of the outer moat portion 3, the rigidity of the vehicle hood 10 can be efficiently improved.

[3. Modification example]
In the above-described embodiment, the inner panel 2 provided with the three islands 8 is illustrated, but the number of the islands 8 is not limited to this. By providing at least one island portion 8 and surrounding it with the first terrace portion 11 and forming the island portion slit 9 between the annular portion 7 and the first terrace surface 21, the same effect as that of the above-described embodiment is obtained. It becomes a structure that plays. In the above-described embodiment, the outer panel 1 and the inner panel 2 are formed of an aluminum alloy panel material, but other types of panel materials may be used.

1 Outer panel 2 Inner panel 3 Outer moat 4 Striker 5 Striker fixing part 6 Opening 7 Circular part 8 Island part 9 Island part slit 10 Vehicle hood 11 First terrace part 12 Second terrace part 13 Terrace slit 14 Grill 15 Grill support Part 16 Grill reinforcement 21 First terrace surface 22 Second terrace surface 23 Grill terrace surface 24 First bottom surface 25 Second bottom surface

Claims (5)

In a vehicle hood provided with an outer panel, an inner panel joined to a peripheral end of the outer panel, and a hood lock device.
An outer moat portion extending along each end portion and the rear end portion of the inner panel in the vehicle left-right direction and having a convex shape away from the outer panel.
A striker fixing portion that is connected to the bottom surface of the outer moat portion and to which the striker of the hood lock device is fixed,
An opening provided in the inner panel behind the vehicle fixing portion and the opening
An annular portion provided in an annular shape along the periphery of the opening and adhered to the lower surface of the outer panel, and an annular portion.
An island portion having a shape that is convex toward the outer panel, with the annular portion as the top surface, and an island portion.
A first terrace that surrounds the entire circumference of the island and forms a terrace-shaped first terrace between the outer moat and the outer moat.
An island slit having a shape cut out in a slit shape between the annular portion and the first terrace surface and radially arranged with respect to the opening.
A grill attached to the front end of the vehicle hood,
A grill support portion that supports the back surface of the grill attached at the front end portion of the outer panel, and a grill support portion.
A terrace-shaped grille terrace surface is formed at a position lower than the striker fixing portion, and the front end portion of the inner panel is provided with a grill reinforcing portion connected to the front end side of the grill support portion.
The outer moat portion is provided so as to extend from each end of the inner panel in the left-right direction of the vehicle toward the striker fixing portion, and branched from the first bottom surface toward the grill terrace surface. A vehicle hood characterized by having an extended second bottom surface. The vehicle hood according to claim 1, wherein a large number of the island slits are arranged on the front side of the vehicle rather than on the rear side of the vehicle. The vehicle hood according to claim 1 or 2, further comprising a second terrace portion forming a terrace-shaped second terrace surface between the striker fixing portion and the first terrace surface. 3. The third aspect of the present invention is characterized in that it has a shape obtained by cutting between the first terrace surface and the second terrace surface in a slit shape, and is provided with a terrace slit extending along the inclination direction of the terrace cliff. Described vehicle hood. The second terrace is arranged in front of the vehicle with respect to the first terrace.
The vehicle hood according to claim 4, wherein the terrace slits are extended in the front-rear direction of the vehicle .

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