JP7367555B2 - vehicle hood - Google Patents

Description

The present invention relates to a vehicle hood including an outer panel and an inner panel joined to the peripheral edge of the outer panel.

Conventionally, a structure has been known in which a reinforcing member is inserted between an outer panel and an inner panel in a vehicle hood (hereinafter also simply referred to as a "hood") that covers the top surface of a vehicle compartment (engine room, motor room, etc.). ing. For example, a structure has been proposed in which an arch-shaped bracket is fixed to an inner panel and the plate surface of the bracket is extended along the back surface of an outer panel (see Patent Document 1). Furthermore, a structure has been proposed in which a plate-shaped reinforcing member is attached to the back surface of the outer panel to increase rigidity (see Patent Document 2).

Japanese Patent Application Publication No. 2006-306237 Japanese Patent Application Publication No. 2016-010995

Energy when an external force (load) is applied to the hood is absorbed by deformation of members such as the outer panel and the inner panel. However, since there are structures such as a deck garnish, cowl, and fender below the outer periphery of the hood (for example, just in front of the windshield), for example, if a pedestrian's head collides with the rear end of the hood, There is a risk that these structures will bottom out and fail to ensure sufficient energy absorption performance. Further, from the viewpoint of pedestrian protection, it is desirable that the same energy absorption performance can be exhibited no matter where on the hood the pedestrian's head collides.

The present vehicle hood was devised in view of these issues, and one of its purposes is to exhibit the same energy absorption performance regardless of the location where the load is applied. In addition, other purposes of the present invention are not limited to this purpose, but also to achieve functions and effects that are derived from each configuration shown in the detailed description of the invention and that cannot be obtained by conventional techniques. be.

(1) The vehicle hood disclosed herein includes an outer panel that forms the outer surface of the vehicle, and an inner panel that is joined to a peripheral edge of the outer panel and located below the outer panel. The absorbent member is provided with a bent plate material having a fixing point to the upper surface of the inner panel at the rear end and an attachment point to the lower surface of the outer panel at the front end. The absorbing member extends in the front-rear direction between an intermediate portion that slopes upward from the rear end toward the front of the vehicle and connects to the front end, and the fixing point and the attachment point of the intermediate portion. and a slit. The intermediate portion has a curved shape in which one of the left and right portions with the slit interposed therebetween is convex upward, and the other left and right portion with the slit sandwiched therebetween is a curved shape with a downward convex portion.

(2) Preferably, one of the left and right portions is provided with a first bead that is convex downward, and the other left and right portion is provided with a second bead that is convex upward.
(3) The first bead and the second bead are preferably provided at positions near the front end in the intermediate portion.

(4) It is preferable that the absorbent member has an auxiliary bead protruding from a folded portion formed by the rear end portion and the intermediate portion.
(5) Preferably, the vehicle is provided with a deck garnish between the vehicle hood and the cowl. In this case, it is preferable that the inner panel has a through hole extending in the left-right direction at a position vertically below the intermediate portion.
(6) In the absorption member, it is preferable that both left and right edges of the rear end portion are cut out so that the left and right dimensions of the rear end portion are smaller than the left and right dimensions of the front end portion.

According to the disclosed vehicle hood, since an upwardly convex portion and a downwardly convex portion are provided in the intermediate portion of the absorbing member, the way in which it folds when a load is input (folding direction) are not equal in the vehicle width direction. Therefore, the same energy absorption performance can be exhibited regardless of the position where the load is applied.

FIG. 1 is an exploded perspective view showing a vehicle hood according to an embodiment. FIG. 2 is a perspective view showing a state in which an absorbent member is fixed to the inner panel of the vehicle hood shown in FIG. 1. FIG. 3 is a top view of the inner panel and absorbent member of FIG. 2. FIG. FIG. 4 is an enlarged perspective view showing part A (around the right absorbing member) in FIG. 3. FIG. FIG. 5 is a perspective view of the absorbent member of FIG. 4 viewed from the outside (right side) in the vehicle width direction. 5 is a cross-sectional view of the absorbent member of FIG. 4. FIG. FIG. 2 is a sectional view of a main part of a vehicle equipped with the vehicle hood of FIG. 1, showing a state before an object collides with the vehicle hood. FIG. 8 is a cross-sectional view for explaining the effect when an object collides with the vehicle hood of FIG. 7;

A vehicle hood as an embodiment will be described with reference to the drawings. The embodiments shown below are merely illustrative, and there is no intention to exclude the application of various modifications and techniques not specified in the embodiments below. Each structure of this embodiment can be modified and implemented in various ways without departing from the spirit thereof. Further, they can be selected or combined as necessary.

In the following description, the forward direction of the vehicle will be referred to as the front of the vehicle (simply referred to as "the front"), the backward direction will be referred to as the rear of the vehicle (simply referred to as "rear"), and left and right will be defined with the front as a reference. Note that the left-right direction of the vehicle is also referred to as the "vehicle width direction," and the vehicle longitudinal direction is simply referred to as the "front-rear direction." Also, the vertical direction is determined by assuming that the direction of gravity is downward and the opposite direction is upward.

[1. composition]
An exploded perspective view of a vehicle hood 1 according to the present embodiment is shown in FIG. 1, which is a longitudinal section taken along the front-rear direction through a main part of a vehicle equipped with this vehicle hood 1 (around the rear end of the vehicle hood 1). A plan view is shown in FIG. The vehicle hood 1 is a member that covers the upper surface of a compartment 7 (in-vehicle goods storage room such as an engine room or a motor room, see FIG. 7) provided at the front of the vehicle.

Near the rear end of the compartment 7, there are provided a hinge that pivots the vehicle hood 1 relative to the vehicle body so that it can be opened and closed, and a spring (both not shown) that biases the vehicle hood 1 in the opening direction. Further, near the front end of the compartment 7, a hood lock device for maintaining the vehicle hood 1 in the closed state and a support rod (both not shown) used for maintaining the vehicle hood 1 in the open state are provided.

The vehicle hood 1 includes an outer panel 2, an inner panel 3, and absorbent members 10 and 20. The outer panel 2 is a member that forms the outer surface of the vehicle (vehicle hood 1), and the front plate surface is subjected to decorative painting or uneven processing. Furthermore, a grill reinforcing portion 2a is provided at the front of the outer panel 2, in which an opening (not shown) is formed through which cooling air introduced into the compartment 7 passes. A vehicle grill 4 is attached to the grill reinforcing portion 2a.

The inner panel 3 is arranged below the outer panel 2 at a predetermined interval, and is joined to the peripheral edge of the outer panel 2. The plate surface of the inner panel 3 is provided with irregularities to increase strength and rigidity. In the vehicle of this embodiment, a deck garnish 6 is provided between the rear end portion of the vehicle hood 1 and the cowl 5, as shown in FIG. A front end portion of the deck garnish 6 is placed in contact with the cowl 5. Further, the upper end portion of the deck garnish 6 is disposed close to the lower surface of the inner panel 3 with a slight gap therebetween.

As shown in FIGS. 1 to 3, the absorbing members 10 and 20 are fixed to the upper surface of the inner panel 3 (for example, the upper surface of the rear end portion 3a), and have the function of absorbing the load input to the vehicle hood 1. have. FIG. 1 illustrates a case where two absorbing members 10 and 20 are arranged side by side in the vehicle width direction (left-right direction) on the right side of a vehicle hood 1 with an interval between them. The two absorbing members 10 and 20 are both formed by bending plate materials. The shape of the absorbing member 10 located on the outside in the vehicle width direction (the end of the vehicle hood 1) and the shape of the absorbing member 20 located on the inside in the vehicle width direction (on the left side of the absorbing member 10) are different from each other.

Although FIG. 1 illustrates a vehicle hood 1 in which two absorbent members 10 and 20 are arranged, the number of absorbent members 10 and 20 is not limited to this, and for example, the number of absorbent members 10 and 20 is not limited to this. An absorbing member 10 may be arranged in each of the sections, or a plurality of absorbing members 20 may be arranged in parallel in the vehicle width direction. When the absorbent members 10 are arranged at both the left and right ends, the shapes of the two absorbent members 10 are symmetrical to each other. Furthermore, when a plurality of absorbing members 20 are arranged, the shapes of all the absorbing members 20 are substantially the same. Hereinafter, when distinguishing between the two types of absorbent members 10 and 20, the latter absorbent member 20 will be referred to as the "intermediate absorbent member 20." First, the absorbent member 10 will be explained in detail, and then the intermediate absorbent member 20 will be briefly explained.

As shown in FIG. 3, the absorbing member 10 is formed in an outer shape based on a rectangular shape elongated in the vehicle width direction, with edges including two rear corners cut out, when viewed from above. That is, in the absorbent member 10, both left and right edges of the rear end 11 are cut out so that the left and right dimensions of the rear end 11 are smaller than the left and right dimensions of the front end 12. Note that the horizontal direction of the absorbing member 10 substantially coincides with the vehicle width direction of the vehicle.

As shown in FIGS. 4 and 5, the absorbent member 10 has a fixing point 11p to the upper surface of the inner panel 3 at the rear end 11, and a fixing point 11p to the upper surface of the outer panel 2 (see FIG. 1) at the front end 12. It has an attachment point 12p. That is, as shown in FIG. 7, the absorbent member 10 has a rear end 11 located below the front end 12, and an intermediate portion that slopes upward from the rear end 11 toward the front and connects to the front end 12. It has a section 13.

As shown in FIGS. 4 and 5, the rear end portion 11 is shaped to follow the top surface of the inner panel 3 to which it is fixed, and the front end portion 12 is shaped to follow the bottom surface of the outer panel 2 to which it is fixed. Ru. In the absorbent member 10 of the present embodiment, the rear end portion 11 is formed entirely in a planar shape, and the front end portion 12 has two corners with attachment points 12p formed in an upwardly convex shape and is substantially planar. It is said that In addition, in the absorbent member 10 of this embodiment, a portion spot welded to the inner panel 3 is provided as a fixed point 11p, and a portion bonded to the outer panel 2 with an adhesive 12a is provided as an attachment point 12p. It will be done. In addition, in FIG. 5, the adhesive 12a is omitted and only the attachment point 12p is shown. A portion of the absorbent member 10 where the adhesive 12a is provided (attachment point 12p) is recessed downward.

As shown in FIGS. 4 and 5, the absorbent member 10 is provided with a slit 14 extending in the front-rear direction between the fixing point 11p and the attachment point 12p of the intermediate portion 13. The slit 14 is a long hole that penetrates the absorbent member 10 in the thickness direction, and is formed in the middle of the absorbent member 10 in the left-right direction. The slit 14 of this embodiment is formed across a part of the rear end part 11 and a part of the front end part 12 of the absorbent member 10.

The intermediate portion 13 of the absorbent member 10 is divided into two parts with a slit 14 in between. Hereinafter, of the two parts separated by the slit 14, the inner part in the vehicle width direction will be referred to as the "inner part 13A", and the outer part in the vehicle width direction will be referred to as the "outer part 13B". In the absorbent member 10 disposed on the right side of the vehicle hood 1, the portion of the intermediate portion 13 on the left side of the slit 14 is the inner portion 13A, and the portion on the right side of the slit 14 is the outer portion 13B. Note that when the absorbent member 10 is also arranged on the left side of the vehicle hood 1, the part of the intermediate part 13 on the right side of the slit 14 becomes the inner part 13A, and the part on the left side of the slit 14 becomes the outer part. It becomes 13B.

The intermediate portion 13 of this embodiment has a curved shape in which an inner portion 13A (one of the left and right portions with the slit 14 in between) is convex upward, and an outer portion 13B (the other left and right portion with the slit 14 in between) is downward. It has a curved shape that is convex. Further, the upwardly convex inner portion 13A is provided with a downwardly convex first bead 15a, and the downwardly convex outer portion 13B is provided with an upwardly convex second bead 15b. is provided. That is, when the absorbent member 10 is viewed from above, the first bead 15a is recessed in the inner part 13A, and the second bead 15b is bulged in the outer part 13B.

FIG. 6 shows a longitudinal section view of the absorbent member 10 cut in the front-rear direction at a portion between the first bead 15a and the slit 14 in the inner portion 13A. A dashed dotted line L in FIG. 6 is a virtual straight line connecting the folded part 16 formed by the rear end 11 and the middle part 13 and the folded part 18 formed by the front end 12 and the middle part 13. . “A curved shape in which the inner portion 13A is upwardly convex” means that the inner portion 13A is curved so as to be located above the dashed line L. Similarly, "a curved shape in which the outer portion 13B is downwardly convex" means that the outer portion 13B is curved so as to be located below the dashed line L. The bent portion 16 is a portion bent upward from the front edge of the rear end portion 11 (formed in a curve), and the bent portion 18 is a portion bent downward from the rear edge of the front end portion 12 (formed in a curve). ) part.

As shown in FIGS. 4 and 5, the first bead 15a and the second bead 15b are provided at positions near the front end 12 in the intermediate portion 13. As shown in FIGS. Although these two beads 15a and 15b are vertically opposite in their protruding directions, their positions, sizes, and protruding amounts are equal to each other. The two beads 15a and 15b have the function of promoting deformation of the absorbing member 10 when a load is applied to the vehicle hood 1. Note that, at a position near the rear end portion 11 of the intermediate portion 13, there is a flat portion where the beads 15a and 15b are not provided.

The absorbent member 10 of this embodiment has auxiliary beads 17 protruding from each of the two bent portions 16. The auxiliary bead 17 has a function of increasing the rigidity of the bent portion 16. The auxiliary bead 17 of this embodiment extends in the front-rear direction from the rear edge of the rear end portion 11 to the lower ends of the inner portion 13A and the outer portion 13B.

Next, the intermediate absorbent member 20 will be explained. As shown in FIG. 3, the intermediate absorbent member 20 of this embodiment is formed in a rectangular shape that is long in the vehicle width direction when viewed from above. Like the absorbent member 10, the intermediate absorbent member 20 has a fixing point (not shown) on the upper surface of the inner panel 3 at its rear end 21, and a lower surface of the outer panel 2 (see FIG. 1) at its front end 22. and an attachment point (not shown). That is, similarly to the absorbent member 10, the intermediate absorbent member 20 also has a rear end 21 located below the front end 22, and slopes upward from the rear end 21 toward the front to connect to the front end 22. It has an intermediate portion 23.

Further, the intermediate absorbent member 20 is provided with a slit 24 similar to that of the absorbent member 10, which extends in the front-rear direction between the fixing point and the attachment point of the intermediate portion 23. The intermediate portion 23 of the intermediate absorbent member 20 is divided into two parts with a slit 24 in between, and both parts are formed in a curved shape convex upward. Note that the intermediate portion 23, which is convex upward, is provided with a bead 25, which is convex downward, similar to the first bead 15a. Further, as shown in FIG. 5, the intermediate absorbent member 20, like the absorbent member 10, has an auxiliary bead 27 projecting from the lower bent portion 26.

Further, as shown in FIGS. 3 to 5 and 7, the inner panel 3 of this embodiment has a through hole extending in the left-right direction at a position vertically overlapping the intermediate portions 13, 23 of the absorbent members 10, 20. 3h is provided. In the inner panel 3 of this embodiment, the plurality of through holes 3h are arranged in parallel in the vehicle width direction, and are arranged forward of the rear end parts 11, 21 and vertically below the intermediate parts 13, 23. . As shown in FIG. 7, in the vehicle hood 1 of this embodiment, the inner panel 3 is curved in the direction away from the outer panel 2 (downward) near the rear end, and the inner panel 3 is curved in the direction away from the outer panel 2 (downward). The space between the inner panel 3 and the inner panel 3 is widened. The above-mentioned absorbing members 10 and 20 are arranged within this expanded space.

[2. action, effect]
Next, the effect when the object 50 imitating a pedestrian's head collides with the vehicle hood 1 (for example, near the rear end) described above will be explained using FIGS. 7 and 8. As shown by the white arrow in FIG. 7, when an object 50 collides toward the vicinity of the rear end of the vehicle hood 1, the object 50 pushes the outer panel 2 downward, and the load is transferred to the absorbing members 10 and 20. Conveyed.

As shown in FIG. 8, the front end portion 12 and middle portion 13 of the absorbent member 10 deform as the outer panel 2 deforms. Since the intermediate portion 13 has different bending directions in the inner portion 13A and the outer portion 13B, the manner in which the intermediate portion 13 deforms when a load is applied is different from each other. Therefore, the energy absorption performance is made constant regardless of the collision position of the object 50. Further, the intermediate absorbing member 20 also absorbs energy by deforming the front end portion 22 and the intermediate portion 23 as the outer panel 2 deforms.

Further, as shown by the white arrow in FIG. 8, the rear end portion 11 of the absorbing member 10 presses the inner panel 3, and the load is transmitted to the inner panel 3. This load is difficult to be transmitted to the front of the inner panel 3 due to the through-hole portion 3h, and is mainly transmitted to the deck garnish 6 below. Thereby, the deck garnish 6 deforms and absorbs the load. Similarly, the rear end 21 of the intermediate absorbent member 20 pushes the inner panel 3, deforming the deck garnish 6 below it.

As described above, according to the vehicle hood 1 described above, the absorbent member 10 is provided with an upwardly convex portion (here, the inner portion 13A) and a downwardly convex portion (here, the outer portion 13B). Therefore, the way the absorbing member 10 bends (bending direction) when a load is input across the slit 14 is not equal in the vehicle width direction. Therefore, compared to the case where absorbing members that are bent in the same way (for example, the intermediate absorbing member 20 described above) are used, the energy absorbing performance can be made constant (leveled out) regardless of the position where the load is applied. Therefore, there are no locations with extremely high performance or locations with extremely low performance, and the same energy absorption performance can be exhibited no matter where the pedestrian's head collides with the vehicle hood 1, which improves pedestrian protection performance. I can do it.

Further, in the intermediate portion 13, the first bead 15a is provided on the inner portion 13A, and the second bead 15b is provided on the outer portion 13B, so that the absorbing member 10 deforms when a load is applied to the vehicle hood 1. can be promoted and energy absorption performance can be improved.

In particular, since these beads 15a and 15b are provided in the intermediate portion 13 at a position closer to the front end 12, deformation can be concentrated on the rear end 11 of the absorbing member 10, and the stroke inside the vehicle hood 1 can be reduced. (The space between the outer panel 2 and the inner panel 3) can be used efficiently to absorb energy.

Since the above-mentioned absorbing member 10 is provided with the auxiliary bead 17 at the lower bent portion 16, the rigidity of the bent portion 16 can be ensured. Thereby, the load can be smoothly transmitted from the absorbing member 10 to the inner panel 3, and energy can be absorbed by the inner panel 3 and the structure below it (for example, the deck garnish 6).

In the above-mentioned inner panel 3, since the through hole 3h is located vertically below the intermediate portion 13 of the absorbing member 10, that is, in front of the fixing point 11p, the inner panel 3 is pushed without dispersing the load absorbed by the absorbing member 10. be able to. This allows the load to be transmitted to the deck garnish 6 earlier than in a configuration in which there is no elongated through hole 3h, and the energy absorption performance can be further improved.

In the absorbent member 10 described above, both left and right edges of the rear end portion 11 are cut out, so that the absorbent member 10 is easily deformed from the intermediate portion 13 to the rear end portion 11. Thereby, the energy absorption performance of the absorption member 10 can be further improved. In addition, since the front end portion 12 of the absorbing member 10 is attached to the lower surface of the outer panel 2 with an adhesive 12a, it can contribute to improving the tensile rigidity of the outer panel 2.

Note that since the above-described vehicle hood 1 is provided with the intermediate absorbent member 20, similar effects can be obtained from a structure similar to that of the above-described absorbent member 10. For example, the improvement in energy absorption performance by the bead 25 and the rigidity improvement effect by the auxiliary bead 27 can also be obtained in the intermediate absorption member 20.

[3. others]
The configuration of the vehicle hood 1 described above is just an example, and is not limited to the configuration described above. For example, both edges of the rear end portion 11 of the absorbent member 10 may be uncut (rectangular in top view), or only one of the left and right edges may be cut out. . Further, the position and length of the auxiliary bead 17 are merely examples, and three or more auxiliary beads may be provided, or auxiliary beads that are inclined (diagonal) with respect to the front-rear direction may be provided. Note that the auxiliary bead 17 is not essential and may be omitted.

The absorbent member 10 may have a curved shape in which the inner part is convex downward, and the outer part may be curved in shape to convex upward. In this case, it is preferable that a first bead that is convex upward is provided on the inner side that is convex downward, and a second bead that is convex downward is provided on the outer side that is convex upward.
Note that the positions and sizes of the first bead 15a and the second bead 15b described above are not limited to those described above, and may be provided at the intermediate portion of the intermediate portion 13 in the front-rear direction. Moreover, the first bead 15a and the second bead 15b do not have to be formed to have the same size or protrusion amount. Note that the first bead 15a and the second bead 15b are not essential and may be omitted.

The method of fixing the absorbent member 10 to the outer panel 2 and the inner panel 3 is not limited to the above-described bonding and spot welding. Further, the through hole portion 3h of the inner panel 3 is not essential and can be omitted. Note that the structure disposed below the rear end portion of the vehicle hood 1 is merely an example, and is not limited to the cowl 5 and deck garnish 6 described above.

In addition, if the absorbing members 10 and 20 are provided at the rear end 3a of the vehicle hood 1 as in the above embodiment, when a load is applied to the rear end 3a, the absorption members 10, 20 can be Although similar energy absorption performance can be exhibited, the front and rear positions of the absorbing members 10 and 20 are not limited to the rear end portion 3a. For example, in the case of a vehicle in which a structure such as a fender bracket is provided below the vehicle hood 1, the above-mentioned absorbing member may be placed near the fender (within the frame indicated by the two-dot chain line in FIG. 3). You may. Even with such a configuration, the same effects as those of the above-described embodiment can be achieved.

1 Vehicle hood 2 Outer panel 3 Inner panel 3a Rear end 3h Through-hole 5 Cowl 6 Deck garnish 10 Absorbent member 11 Rear end 11p Fixing point 12 Front end 12p Attachment point 13 Intermediate part 13A Inner part (left and right parts) )
13B Outside part (left and right other part)
14 Slit 15a First bead 15b Second bead 16 Bent part 17 Auxiliary bead

Claims (6)

A vehicle hood comprising: an outer panel forming an outer surface of a vehicle; and an inner panel joined to a peripheral edge of the outer panel and located below the outer panel,
The plate material is bent and has an absorbing member having a fixing point to the upper surface of the inner panel at the rear end and an attachment point to the lower surface of the outer panel at the front end,
The absorbing member extends in the front-rear direction between an intermediate portion that slopes upward from the rear end toward the front of the vehicle and connects to the front end, and the fixing point and the attachment point of the intermediate portion. a slit;
The intermediate portion is characterized in that one of the left and right portions sandwiching the slit has a curved shape convex upward, and the other left and right portions sandwiching the slit have a curved shape convex downward. Vehicle hood. A first bead that is convex downward is provided on one of the left and right portions,
2. The vehicle hood according to claim 1, wherein the other left and right portions are provided with a second bead that is convex upward. 3. The vehicle hood according to claim 2, wherein the first bead and the second bead are provided at positions closer to the front end in the intermediate portion. The vehicle according to any one of claims 1 to 3, wherein the absorbent member has an auxiliary bead protruding from a bent portion formed by the rear end portion and the intermediate portion. Hood. The vehicle is provided with a deck garnish between the vehicle hood and the cowl,
5. The vehicle hood according to claim 1, wherein the inner panel has a through hole extending in the left-right direction at a position vertically below the intermediate portion. The absorption member is characterized in that both left and right edges of the rear end are cut out so that the left and right dimensions of the rear end are smaller than the left and right dimensions of the front end. The vehicle hood according to any one of items 1 to 5.

Images