JP2008068795A - Vehicle hood structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a vehicular hood structure capable of enlarging a deformation stroke when a collision object abuts on the vehicular hood, while securing rigidity of the vehicular hood when the hood is closed. <P>SOLUTION: The rigidity of the vehicular hood 14 when the hood is closed can be secured by a hood lock reinforcement 30 fixed on the side of a striker fixation patch 26 and a hood outer member 20. Also, a member on the hood outer member 20 side can easily start to deform at a rigidity change section 48 because the rigidity of the member on the side of the hood outer member 20 is smaller than that of a rigidity change section 48 and the rigidity of the member on the striker 24 side is smaller than the rigidity change section 48. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle hood structure provided with a rigid reinforcing member.

  In a vehicle hood, a connection member for supporting and reinforcing may be provided between the hood outer and the lock striker portion (see, for example, Patent Document 1). In such a vehicle hood, the hood outer and the connecting member may be made of an aluminum alloy from the viewpoint of weight reduction.

However, when these are made of an aluminum alloy, it is necessary to increase the rigidity of the aluminum alloy in order to secure the dent (hand-held) rigidity, and the deformation stroke (deformable stroke) when the collision body contacts the hood is increased. Get smaller.
JP 2004-148886 A

  In view of the above facts, an object of the present invention is to provide a vehicle hood structure that can increase a deformation stroke when a collision body abuts on the hood while ensuring rigidity when the hood is closed. .

  The vehicle hood structure according to the first aspect of the present invention includes an aluminum alloy hood outer that forms an outer plate of a hood that covers the engine room so as to be openable and closable, and a hood lower side and a hood front end side with respect to the hood outer. A plate, a striker fixed to the plate and projecting to the lower side of the hood, and a standing part standing from the plate side toward the hood outer side, and spanning between the plate and the hood outer A rigid reinforcing member made of aluminum alloy fixed to the plate side and the hood outer side, and the plate includes an extending portion that extends along the standing portion of the rigid reinforcing member. A rigidity changing portion is provided by coupling the rigidity reinforcing member and the plate with the standing portion and the extending portion, and the rigidity changing portion Ri also members rigidity hood outer side, characterized in that than the rigidity changing portion is set lower than the member rigidity of the striker side.

  According to the vehicle hood structure of the present invention described in claim 1, since the member rigidity on the hood outer side with respect to the rigidity changing portion is set lower than the member rigidity on the striker side with respect to the rigidity changing portion, the rigidity changing portion As a starting point, the member on the hood outer side is easily deformed, and when a collision body abuts the hood and a load of a predetermined value or more is input, the deformation stroke of the hood can be increased. Due to such deformation of the hood, the collision energy at the time of collision is sufficiently absorbed. Moreover, since the extending part of the plate is extended along the standing part of the rigidity reinforcing member, the length of the rigidity reinforcing member from the rigidity changing part to the hood outer can be shortened. For this reason, it becomes easy not only to ensure the static rigidity when the hood is closed by the rigidity reinforcing member, but also to reduce the plate thickness of the rigidity reinforcing member necessary for ensuring the static rigidity. Here, by reducing the plate thickness of the rigid reinforcing member, the portion on the hood outer side is more easily deformed than the stiffness changing portion of the rigid reinforcing member when the collision body contacts the hood, and deformation during dynamic deformation Stroke can be increased. Furthermore, since the rigid reinforcing member and the plate are coupled by the standing portion and the extending portion, when a load exceeding a predetermined value is input when the collision body abuts the hood, the load received via the striker is As a result, the joint portion between the standing portion and the extending portion is input as a load substantially parallel to the shearing direction. The member on the hood outer side becomes easier to deform than the portion.

  A vehicle hood structure according to a second aspect of the present invention is the vehicle hood structure according to the first aspect, wherein the rigidity changing portion is arranged on the rear side of the hood with respect to a portion where the striker is fixed to the plate. And

  According to the vehicle hood structure of the present invention as set forth in claim 2, since the rigidity changing portion is arranged on the hood rear side with respect to the portion where the striker is fixed to the plate, the collision body is the hood rear side of the striker. When a load of a predetermined value or more is input in contact with the part to be, the load is input as a load substantially parallel to the shearing direction to the connecting part of the standing part and the extending part. The joint portion between the installation portion and the extension portion is not easily deformed. For this reason, the load is transmitted to the striker side from the joint part of the standing part and the extension part, and the part of the plate hood at the rear side is bent and deformed downward from the hood, starting from the fixed part of the striker to the plate. The bending moment (load) to be applied is added. As a result, bending deformation occurs in the plate, so that the stroke at the time of dynamic deformation caused by the contact of the collision body with the hood is further increased.

  According to a third aspect of the present invention, there is provided the vehicle hood structure according to the first or second aspect, wherein the upright portion includes a bent portion bent toward the rear side of the hood at an intermediate portion in the vertical direction of the hood. The extending portion extends to the bent portion.

  According to the vehicle hood structure of the present invention described in claim 3, since the standing portion includes the bent portion bent toward the hood rear side at the middle portion in the hood vertical direction, the rigidity reinforcing member is provided from above the hood. It is easier to bend and deform with respect to the load, and the extension part is extended to the bending part, so that the rigidity changing part is aligned with the bending part and the deformation starting point When the impact body is in contact with the hood and a load greater than or equal to a predetermined value is input, the rigidity reinforcing member is located on the lower side of the hood starting from the portion that is the rigidity changing portion and is the bent portion. Easily bends and deforms.

  As described above, according to the vehicle hood structure of the first aspect of the present invention, it is possible to increase the deformation stroke when the collision body contacts the hood while ensuring the rigidity when the hood is closed. It has an excellent effect of being able to.

  According to the vehicle hood structure of the second aspect, it has an excellent effect that a larger deformation stroke can be ensured when the collision body comes into contact with the hood.

  According to the vehicle hood structure of the third aspect, the deformation starting point becomes clearer, and the rigidity reinforcing member is more easily deformed when the collision body comes into contact with the hood.

(Configuration of the embodiment)
An embodiment of a vehicle hood structure in the present invention will be described with reference to the drawings. In the figure, the arrow UP indicates the upward direction of the vehicle, and the arrow FR indicates the forward direction of the vehicle. In the closed state of the hood, the upward direction of the hood is the same as the upward direction of the vehicle, and the forward direction of the hood is the same direction as the forward direction of the vehicle.

  As shown in FIG. 1, a hood 14 that covers the engine room 12 so as to be openable and closable is disposed in the vehicle front portion 10. A well-known hood lock mechanism 16 is disposed corresponding to the central portion of the direction. As shown in FIG. 2, the hood lock mechanism 16 is disposed in the vicinity of the radiator support 18 in the engine room 12.

  The hood 14 constitutes an outer plate of the hood 14 and extends substantially along the vehicle front-rear direction. The hood 14 is an aluminum alloy hood outer 20. The hood 14 is disposed on the lower side of the hood 14 with respect to the hood outer 20. The front end edge portion 20A of the hood outer 20 and the front end edge portion 22A of the hood inner 22 are coupled by a hemming process.

  A striker 24 that constitutes a part of the hood lock mechanism 16 is disposed on the hood front end side of the hood inner 22 (a position away from the front end edge portion 22 </ b> A by a predetermined distance from the hood rear side). The striker 24 is inserted into the through hole 22B formed through the hood inner 22 from the upper side of the hood, protrudes toward the lower side of the hood with respect to the hood inner 22, and has a substantially U-shaped side sectional view. . In order to prevent the striker 24 from bending when the hood 14 is opened and closed, even if the main part is a hood 14 made of an aluminum alloy for the purpose of weight reduction, the striker 24 is made of a high-strength steel material. The striker 24 must be fixed to the hood 14 via a striker fixing patch 26 as a plate made of steel.

  As shown in FIG. 4, the front upper portion and the rear upper portion of the striker 24 are fixed so as to penetrate the steel striker fixing patch 26 in the hood vertical direction and bend in the hood width direction and in directions opposite to each other. Parts 24A and 24B are provided, and these fixing parts 24A and 24B are fixed to the striker fixing patch 26 by welding. The striker fixing patch 26 has a patch shape, and is disposed on the hood lower side and the hood front end side with respect to the hood outer 20 as shown in FIG. 2, and as shown in FIGS. The flat plate-like base 26A on the side is fastened and held to the hood inner 22 (see FIG. 2) by fasteners (bolts 28 and nuts 29 (see FIG. 2)), and the flat plate-like extending portion on the rear side of the hood 26B stands up substantially upward in the hood with respect to the base portion 26A.

  As shown in FIG. 2, the base portion 26A of the striker fixing patch 26 is disposed along the hood inner 22, and a hood lock as a rigid reinforcing member made of aluminum alloy is disposed above the base portion 26A. A fixing portion 32 of the reinforcement 30 is provided. The hood lock reinforcement 30 is disposed in order to ensure the rigidity of the hood front end corresponding to the hand-held portion when the hood 14 is opened and closed, and extends along the hood width direction (not shown), and is fixed to the striker. A fixing portion 32 disposed substantially along the patch 26 is fastened and fixed to the striker fixing patch 26 and the hood inner 22 by fasteners (bolts 28 and nuts 29). The reason why the hood lock reinforcement 30 is made of an aluminum alloy instead of steel is to reduce the weight, and the hood lock reinforcement 30 and the striker fixing patch 26 are made of different materials. It is fastened not with welding but with fasteners (bolts 28 and nuts 29).

  The hood lock reinforcement 30 reaches the flange portion 36 fixed to the hood outer 20 through the vertical wall portion 34 from the fixing portion 32 toward the hood front side, and from the fixing portion 32 toward the hood rear side. The flange portion 40 is fixed to the hood outer 20 through the standing portion 38.

  The vertical wall portion 34 that continues from the fixed portion 32 to the front side of the hood is formed obliquely upward toward the front side of the hood, and the flange portion 36 that continues to the vertical wall portion 34 extends substantially along the lower surface of the hood outer 20. It extends to the front side and is fixed to the hood outer 20 by a mastic 42 as an adhesive.

  The standing portion 38 continuous from the fixing portion 32 to the rear side of the hood is erected from the striker fixing patch 26 side toward the hood outer 20 side, and bridges between the striker fixing patch 26 and the hood outer 20. Here, the standing portion 38 is provided with a bent portion 38A that extends obliquely upward to the rear side of the hood and is bent to the rear side of the hood at an intermediate portion in the vertical direction of the hood. The slope toward the side is gentle. The bent portion 38A forms a straight portion along the hood width direction (not shown). Further, the flange portion 40 bent from the standing portion 38 and continuing to the rear side of the hood is along the lower surface of the hood outer 20 and is fixed to the hood outer 20 by a mastic 42.

  The extension part 26B of the striker fixing patch 26 extends to the bent part 38A along the standing part 38 of the hood lock reinforcement 30. The hood lock reinforcement 30 and the striker fixing patch 26 are fastened by a fastener (bolts 44 and nuts 45) at a standing portion 38 and an extending portion 26B, and are thereby coupled to the standing portion 38. A mating portion 46 is formed on which the extending portion 26B is overlapped. Further, the hood lock reinforcement 30 and the striker fixing patch 26 are coupled by the standing portion 38 and the extending portion 26B, so that the rigidity changing portion 48 is provided. Here, the member rigidity (bending rigidity of the member) on the hood outer 20 side with respect to the rigidity changing portion 48 is set lower than the member rigidity (bending rigidity of the member) on the striker 24 side with respect to the rigidity changing portion 48.

  That is, due to the combination (combination) of the striker fixing patch 26 and the hood lock reinforcement 30, the rigidity difference between the lower front side of the hood and the upper rear side of the hood at the front part of the hood 14 with reference to the rigidity changing part 48. The rigidity of the portion where the striker fixing patch 26 (which is higher in rigidity than the hood lock reinforcement 30) and the hood lock reinforcement 30 overlap is K1, and the rigidity of the hood lock reinforcement 30 is When K2 is K2, K1> K2. Here, the extending portion 26B of the striker fixing patch 26 is a portion that is desired to deform the standing portion 38 in a state where the load F is input from above the hood 14 (a portion that is desired to be a folding portion in the folding mode of the standing portion 38). ). As a result, the rigidity changing portion 48 that becomes the boundary between the high-rigidity portion and the low-rigidity portion is used as a trigger to deform into the folding mode. Further, the stiffness changing portion 48 and the mating portion 46 are arranged on the rear side of the hood with respect to the portion where the striker 24 is fixed to the striker fixing patch 26.

(Operation and effect of the embodiment)
Next, the operation and effect of the above embodiment will be described.

  In the vehicle hood structure of the present embodiment, the member rigidity on the hood outer 20 side with respect to the rigidity changing portion 48 is set lower than the member rigidity on the striker 24 side with respect to the rigidity changing portion 48. In other words, the rigidity difference Therefore, the hood outer 20 side member (the hood outer 20 side portion of the hood outer reinforcement 30 and the hood outer 20 side of the hood outer 20 and the hood outer 20 side of the hood outer 20 with respect to the rigidity changing portion 48) is provided. In addition, the rear portion of the hood is easily deformed. Also, by making the hood front lower side more rigid than the hood rear upper side with reference to the rigidity changing portion 48, when a load is applied from the hood upper side, the hood front lower side (the striker 24 side) Since the load can be supported, the upper side after the hood is easily bent and deformed. As a result, as shown in FIG. 3, the collision body 50 abuts (collises) from the obliquely upward front side of the vehicle at the front portion of the hood 14 and near the central portion in the hood width direction, and a load F of a predetermined value or more is input In such a case, the deformation stroke of the hood 14 can be increased. Due to such deformation of the hood 14, the collision energy at the time of collision is sufficiently absorbed.

  Here, since the standing portion 38 includes a bent portion 38A that is bent toward the hood rear side at the middle portion of the hood in the vertical direction, the hood lock reinforcement 30 is bent when the collision body 50 comes into contact with the hood 14. Compared to the configuration without the portion 38A, it is easy to be deformed, and since the extended portion 26B extends to the bent portion 38A, the rigidity changing portion 48 is aligned with the bent portion 38A, and the deformation starting point is clearer When the impact body 50 comes into contact with the hood 14 and a load F of a predetermined value or more is input, the hood lock reinforcement 30 starts from the portion that is the rigidity changing portion 48 and is the bent portion 38A. Easily bends and deforms downward.

  Further, as shown in FIG. 2, since the extension part 26 </ b> B of the striker fixing patch 26 extends along the standing part 38 of the hood lock reinforcement 30, the hood from the rigidity changing part 48 to the hood outer 20 is provided. The length L in the lock reinforcement 30 can be shortened. For this reason, the hood lock reinforcement 30 not only facilitates securing the static rigidity when the hood 14 is closed, but also reduces the plate thickness of the hood lock reinforcement 30 necessary for securing the static rigidity. Here, by reducing the plate thickness of the hood lock reinforcement 30, the portion on the hood outer 20 side is more easily deformed than the rigidity changing portion 48 in the hood lock reinforcement 30 when the collision body 50 is brought into contact with the hood 14. Thus, the deformation stroke at the time of dynamic deformation can be increased (ensuring the amount of deformation).

  Further, since the hood lock reinforcement 30 and the striker fixing patch 26 are coupled by the standing portion 38 and the extending portion 26B, the collision body 50 abuts on the hood 14 and a load F of a predetermined value or more is input. Therefore, the load received via the striker 24 is input to the mating portion 46 as a load substantially parallel to the shear direction. As a result, the mating portion 46 is less likely to be deformed than the rigidity changing portion 48. The member on the hood outer 20 side is easily deformed. Even when the hood 14 is closed, the load received via the striker 24 is input to the mating portion 46 as a load substantially parallel to the shearing direction, and in this case, the mating portion 46 is not easily deformed.

  Further, since the rigidity changing portion 48 is disposed on the hood rear side with respect to the portion where the striker 24 is fixed to the striker fixing patch 26 (fixed portion 52), the collision body 50 is on the hood 14 on the hood rear side of the striker 24. In the case of contact with the part, the load F is input to the mating portion 46 as a load substantially parallel to the shearing direction, and the mating portion 46 is not easily deformed. For this reason, the load is transmitted from the mating portion 46 to the striker 24 side, and the fixing portion 52 of the striker 24 to the striker fixing patch 26 is a starting point at the intersection of the base portion 26A and the extending portion 26B in the striker fixing patch 26. A bending moment M (load) to be bent and deformed downward is applied. As a result, bending deformation occurs in the striker fixing patch 26, so that the stroke at the time of dynamic deformation caused by the contact of the collision body 50 with the hood 14 is further increased.

  Further supplementally, the aluminum alloy hood 14 is lighter than the steel hood 14 and has a small reaction force against the collision body, and the acceleration of the collision (collision G) rises slowly. Sometimes, it is preferable to increase the collision energy absorption amount by securing a deformation stroke. In the vehicle hood structure of the present embodiment, the amount of deformation stroke at the time of collision can be increased as compared with the conventional structure, so that the collision energy at the time of collision can be sufficiently absorbed.

  FIG. 5 is a GS diagram showing the relationship between the impactor generated deceleration and the stroke when the impactor collides with the hood. Here, the displacement (S) on the horizontal axis indicates the amount of displacement of the impactor that has collided with the hood, and the acceleration (G) on the vertical axis indicates the impactor generation deceleration (negative acceleration, but in FIG. ), In other words, the acceleration received by the impactor. In addition, the solid line shows the GS diagram in the structure of the present embodiment, and the dotted line shows the GS in the proportionality in which the plate thickness of the hood lock reinforcement is set not to include the structure of the present embodiment. A diagram is shown. In the proportionality indicated by the dotted line, since the stroke is small, the impactor generation deceleration increases and the impact received by the impactor increases. On the other hand, in the structure of the present embodiment shown by the solid line, the stroke is large, and therefore the impactor generated deceleration can be reduced more than the proportionality, and the impact received by the impactor is reduced.

  As described above, according to the vehicle hood structure of the present embodiment, the deformation stroke when the collision body 50 comes into contact with the hood 14 is increased while ensuring the rigidity (dent resistance) when the hood is closed. Can do.

(Supplementary explanation of the embodiment)
As shown in FIG. 2, in the above embodiment, the hood lock reinforcement 30 is fixed to the striker fixing patch 26 (fixing the fixing portion 32 to the base portion 26 </ b> A and the standing portion 38 to the extending portion 26 </ b> B. Bolts 28 and 44 and nuts 29 and 45 are used for fixing, but fixing the hood lock reinforcement 30 to the striker fixing patch 26 (fixing the fixing portion 32 to the base portion 26A and extending the standing portion 38) For example, other fasteners such as rivets may be used for fixing to 26B.

  Moreover, in the said embodiment, although the rigidity change part 48 is arrange | positioned in the hood back side rather than the site | part (fixed part 52) where the striker 24 is fixed to the striker fixing patch 26, in the hood front-back direction of a rigidity change part. The position may be configured such that the striker is not on the hood rear side with respect to the portion where the striker is fixed to the striker fixing patch (plate).

  Moreover, in the said embodiment, although the bending part 38A in the standing part 38 forms the linear part along the hood width direction, a bending part is other line parts, such as an arc-shaped line part, in the hood width direction. May be formed. Further, the standing portion may have a flat plate-like configuration that is not bent at an intermediate portion in the vertical direction of the hood.

  Furthermore, in the above embodiment, the extending portion 26B extends along the standing portion 38 to the middle portion of the standing portion 38 in the hood vertical direction, but the extending portion stands up along the standing portion. It is good also as a structure extended to the upper part of the hood up-down direction of a part.

  Furthermore, in the above-described embodiment, the extending portion 26B of the striker fixing patch 26 has a flat plate shape and extends along the standing portion 38 of the hood lock reinforcement 30. For example, the extending portion of the plate May be formed in a corrugated plate shape and extend in a direction along the standing portion of the rigid reinforcing member.

  In the above embodiment, the hood lock reinforcement 30 has the flange portion 40 bent from the standing portion 38 and is continuous to the rear side of the hood, and is fixed to the hood outer 20. Another configuration may be employed in which the upper portion of the installation portion is bent toward the front side of the hood and then further folded back toward the rear side of the hood and continues to the flange portion, and the flange portion is fixed to the hood outer.

1 is a perspective view showing a vehicle front portion to which a vehicle hood structure according to an embodiment of the present invention is applied. It is an expanded sectional view along line 2-2 in FIG. It is an expanded sectional view showing the state where the collision object collided in the hood structure for vehicles concerning the embodiment of the present invention. It is a perspective view which shows the state by which the upper part of the striker in embodiment of this invention was fixed to the striker fixing patch. It is a graph which shows the relationship between the acceleration at the time of an impactor colliding with the vehicle hood, and a displacement.

Explanation of symbols

12 Engine Room 14 Hood 20 Hood Outer 24 Strike 26 Strike Fixing Patch (Plate)
26B Extension part 30 Hood lock reinforcement (rigid reinforcement member)
38 Standing part 38A Bending part 48 Stiffness changing part 52 Fixing part (part where the striker is fixed to the plate)

Claims (3)

A hood outer made of an aluminum alloy that constitutes an outer plate of the hood that covers the engine room in an openable and closable manner;
A plate disposed on the hood lower side and the hood front end side with respect to the hood outer;
A striker fixed to the plate and projecting downward on the hood;
A rigid reinforcing member made of an aluminum alloy provided with an upright portion standing from the plate side toward the hood outer side, spanning between the plate and the hood outer, and fixed to the plate side and the hood outer side; ,
The plate includes an extending portion that extends along the standing portion of the rigid reinforcing member, and the rigid reinforcing member and the plate are connected to the standing portion and the extending portion. The rigidity change part is provided by connecting with
A vehicle hood structure characterized in that a member rigidity on the hood outer side with respect to the rigidity changing portion is set lower than a member rigidity on the striker side with respect to the rigidity changing portion.   The vehicle hood structure according to claim 1, wherein the rigidity changing portion is arranged on a rear side of the hood with respect to a portion where the striker is fixed to the plate.   The said standing part is provided with the bending part bent to the food | hood back side in the intermediate part of the hood up-down direction, The said extension part is extended to the said bending part, The Claim 1 or Claim 2 characterized by the above-mentioned. The vehicle hood structure described in 1.

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