JP2006168653A - Engine hood structure for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine hood structure with good impact absorption efficiency relative to impact load from above in the engine hood, particularly in the engine hood in which the length in a width direction is lengthened more than that in a longitudinal direction. <P>SOLUTION: A hood inner 3 provided on a back surface of a hood outer 2 of the engine hood 1 is an annular shape along an outer periphery of the hood outer 2 and is formed in a shape having a space part 30 extending in a vehicle width direction between a front part lateral frame part 3a along a front end of the hood outer 2 and a rear part lateral frame part 3b along a rear end of the hood outer 2. An inner peripheral side wall 33 erected from an inner peripheral edge of a bottom wall 31 of the front and rear lateral frame parts 3a, 3b and having an upper end bonded to the back surface of the hood outer 2 is formed in a stepped shape having a horizontal part 332 at an intermediate part in a height direction and is made into a structure easily crushed/deformed by the impact load from above. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an engine hood of an automobile, and more particularly to an engine hood structure having a short front and rear length with respect to a lateral width used for a semi-bonnet type vehicle.

Conventionally, from the viewpoint of protecting a pedestrian during a collision, the engine hood of an automobile deforms the engine hood when the head or shoulder of a pedestrian who has fallen into the vehicle at the time of the collision collides with the engine hood from above. The structure which absorbs is taken. For example, as described in Patent Document 1 below, in a passenger car, in an engine hood configured by a hood outer (outer member) and a hood inner (inner member), the hood inner has an outer peripheral portion (outer peripheral bone). A plurality of notches extending in the front-rear direction and a plurality of vertical skeleton parts (skeleton forming parts) are alternately formed on the enclosed inner side. According to this, the vertical skeleton part is easily deformed by the impact load from above, and the shock absorbing performance is exhibited. And the cross-sectional shape composed of the vertical skeleton part and the hood outer is changed in the front-rear direction, which makes it possible to change the rigidity partially and easily adjust the shock absorption performance, and the uniform shock absorption performance as a whole I try to get it.
JP 2004-217008 A

  By the way, in the engine hood of a semi-bonnet type vehicle, the longitudinal length is short. Therefore, as in Patent Document 1, a plurality of vertical skeleton parts separated from each other are provided inside the outer peripheral part of the hood inner, and the vertical hood is caused by a collision load. Even if an attempt is made to absorb the impact by deforming the skeleton part, since the vertical skeleton part is short, the rigidity is large and the deformation is difficult, so that the impact absorbing action of a passenger car having a vertically long engine hood is not exhibited.

  Therefore, as shown in FIG. 5, in a conventional typical engine hood 1A for a semi-bonnet type vehicle, a hood inner 3A installed on the back surface of the hood outer 2 is provided on both left and right sides as a skeleton part inside the outer peripheral part 37. A plurality of vertical bone portions 38a and 38b extending obliquely with respect to the front-rear direction are provided in an intersecting manner, and a plurality of narrow vertical bone portions 39 are provided in the center portion in the front-rear direction. The vertical bone portions 38a and 38b are slanted to increase the overall length and reduce the rigidity, and the vertical bone portion 39 is narrow to reduce the rigidity and facilitate deformation due to a collision load. In the hood inner 3A, the outer peripheral portion 37 and the longitudinal bone portions 38a, 38b, 39 on the inner side thereof have a substantially inverted hat shape, and both flanges are joined to the back surface of the hood outer 2 with an adhesive (not shown) and closed. It constitutes a cross section.

  However, in the conventional engine hood 1A, since the rigidity with respect to the collision load is high at the intersection of the skeleton portions 38a and 38b and is not easily deformed, the shock absorbing performance is lower than the general portion of the skeleton portions 38a and 38b. As shown in FIG. 6, when a collision load acts on the vicinity of the inner peripheral edge of the outer peripheral portion 37 (arrow F <b> 2), the vertical wall-shaped side surface portion 372 rises from the inner peripheral edge of the bottom wall 371 of the outer peripheral portion 37. Since the rigidity in the acting direction of the load is large and the vertical bone portions 38a, 38b, 39 are supported, the side surface portion 372 and the bottom wall 371 are hardly deformed and the upper end of the side surface portion 372 is crushed and deformed. However, the deformation stroke is small, and the deformation range is also local in the vicinity where the collision load F2 is applied, so that the shock absorbing performance is not sufficiently exhibited. This tendency is particularly strong at the front end of the engine hood 1A.

  As described above, the conventional engine hood for a semi-bonnet type vehicle has a problem that the shock absorption performance is not effective in the whole hood, such as variation in the shock absorption performance for each part or the deformation range is localized. There was a point. Therefore, the present invention has been made with an object of providing an engine hood structure that can efficiently absorb shocks by deforming a wide range in an engine hood for an automobile, particularly an engine hood for a semi-bonnet type vehicle. is there.

  The present invention relates to an automobile engine hood structure in which a hood inner is provided on the back surface of a hood outer that forms an outer plate of an engine hood of the automobile, wherein the hood inner is annular along the outer periphery of the hood outer, and is a front portion along the front end of the hood outer. It is formed in a shape having a space portion extending in the vehicle width direction between the horizontal frame portion and the rear horizontal frame portion along the rear end of the hood outer, and the front horizontal frame portion and the rear horizontal frame portion are bottom walls. An outer peripheral side wall standing up from an outer peripheral edge of the hood outer and an inner peripheral side wall standing up from an inner peripheral edge of the bottom wall and having an upper end joined to the back surface of the hood outer. A lower vertical wall portion standing on the inner peripheral side wall of the horizontal frame portion from the inner peripheral edge, a horizontal portion bent substantially horizontally from an upper end of the lower vertical wall portion, and an upper vertical wall portion rising from the horizontal portion Staircase made of Formation to (claim 1). Since the inner peripheral side wall of each horizontal frame part is formed in a staircase shape with the vertical wall part of the upper and lower steps and the intermediate horizontal part, when the pedestrian collides with the engine hood from above, each of the inner peripheral side walls is caused by a collision load. The bending angle of the bent portion is easily deformed, the inner peripheral side wall is crushed and deformed in the vertical direction, and the impact load is absorbed, thereby reducing the impact. In this case, the longitudinal frame portion is not deformed as in the conventional structure, but the long horizontal frame portion is deformed. Therefore, the deformation range can be widened and the impact can be efficiently reduced.

  The position of the inner peripheral edge of the front horizontal frame is set at a substantially central portion in the front-rear direction of the engine hood. Since the inner peripheral edge of the front horizontal frame portion is provided at substantially the center in the front-rear direction of the engine hood with a high probability of a pedestrian colliding, the impact is absorbed by the inner peripheral side wall of the front horizontal frame portion.

  A flange that is bent substantially horizontally from the upper end and is joined to the back surface of the hood outer by an adhesive is formed at the upper end of the upper vertical wall portion. The collision load acting on the hood outer is easily caused to act on the inner peripheral side wall by the flange.

  An angle between the bottom wall and the lower vertical wall is a right angle or an obtuse angle. The inner peripheral side wall is easily deformed by a collision load acting from above.

  A plurality of thin vertical bone portions are erected between the horizontal frame portions in the front-rear direction (Claim 5). It is suppressed that the gap between the front horizontal frame portion and the rear horizontal frame portion is widened by the collision load acting from above by the thin vertical bone portion, and the inner peripheral side wall of the horizontal frame portion is good in deformability.

  The present invention is particularly effective when applied to an engine hood of a semi-bonnet type vehicle in which the length in the vehicle width direction is longer than the length in the front-rear direction (claim 6).

  According to the present invention, there is provided an engine hood structure capable of efficiently absorbing shocks by deforming a wide range on the hood by deforming a lateral frame portion extending in the hood width direction by a collision load acting from above. Can do.

  An embodiment in which the present invention is applied to an engine hood for a semi-bonnet type vehicle will be described with reference to FIGS. 1 is a rear view of the engine hood 1 of the present invention, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a half view of one side of the engine hood 1 taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. As shown in FIG. 1 and FIG. 2, the engine hood 1 is longer in the vehicle width direction than the length in the front-rear direction, and has a rectangular shape that is curved slightly in a bow shape with the center in the width direction protruding forward. The hood outer 2 is configured by a substantially flat hood outer 2 and a hood inner 3 provided on the back surface of the hood outer 2.

  The hood inner 3 has an annular shape along the back surface of the outer peripheral portion of the hood outer 2, and extends in the lateral direction along the front lateral frame portion 3 a that extends laterally along the front end of the hood outer 2 and the rear end of the hood outer 2. The left and right ends of both horizontal frame portions 3a and 3b are connected in a curved manner to both ends of the rear horizontal frame portion 3b by bending both ends of the front horizontal frame portion 3a backward. . A horizontally long space 30 extending along the hood width direction is formed between the front horizontal frame 3a and the rear horizontal frame 3b. A pair of left and right thin vertical bone portions 35, 35 are formed at both left and right positions in the space 30, with the front horizontal frame portion 3 a and the rear horizontal frame portion 3 b extending in the front-rear direction. The hood inner 3 is composed of a metal plate in which front and rear horizontal frame portions 3a and 3b and left and right vertical bone portions 35 and 35 are press-formed integrally.

  The front horizontal frame portion 3a of the hood inner 3 has a substantially straight inner periphery along the vehicle width direction with respect to the front outer periphery that curves like a bow, and the front-rear width at the center in the vehicle width direction is wide. The inner peripheral edge is provided at a substantially central position in the hood front-rear direction. The rear lateral frame portion 3b is linear in the vehicle width direction parallel to the inner peripheral edge of the front lateral frame portion 3a with respect to the outer peripheral edge of the rear side curved in a bow shape, and is located at the front and rear of the left and right sides in the vehicle width direction. The width is wide.

  The front horizontal frame portion 3 a of the hood inner 3 includes a bottom wall 31, a low standing outer peripheral side wall 32 that is bent upward from the outer peripheral edge of the bottom wall 31, and an upright shape that is bent upward from the inner peripheral edge of the bottom wall 31. The inner peripheral side wall 33 forms a shallow cross-sectional container shape.

  The front horizontal frame portion 3a is hemmed so that the coupling flange at the upper edge of the outer peripheral side wall 32 is superimposed on the rear surface of the outer periphery (front edge) of the hood outer 2 and the coupling flange is covered with the outer peripheral edge of the hood outer 2. Are combined. In the front horizontal frame portion 3a, the bottom wall 31 is in a substantially horizontal posture with respect to the hood outer 2 that is inclined forward and downward.

  The inner peripheral side wall 33 of the front horizontal frame portion 3a includes a lower vertical wall portion 331 that is bent at an obtuse angle from the inner peripheral edge of the bottom wall 31 and rises upward and obliquely rearward, and an upper edge of the lower vertical wall portion 331 A horizontal portion 332 that is bent rearward from the rear to form a substantially parallel surface with the hood outer 2, an upper vertical wall portion 333 that is bent substantially perpendicularly upward from an inner peripheral edge of the horizontal portion 332, and an upper edge of the upper vertical wall portion 333 It is formed in a staircase shape having a flange 334 that is bent rearward from the rear and forms a plane substantially parallel to the hood outer 2.

  The bending angle between the lower vertical wall portion 331 of the inner peripheral side wall 33 and the bottom wall 31 is set to about 110 degrees. The horizontal portion 332 is formed at a substantially central position in the height direction of the entire inner peripheral side wall 33.

  The inner peripheral side wall 33 of the front horizontal frame portion 3a has an upper edge flange 334 at a substantially central position in the front-rear direction of the back surface of the hood outer 2, more specifically, about two-fifths of the hood front-rear length from the front edge of the hood outer 2. Furthermore, it is bonded to a half position by a mastic sealer (not shown).

  Similarly, the connecting portion of the front horizontal frame portion 3a with the left and right rear horizontal frame portions 3b is connected to the outer peripheral (side edge) back surface of the hood outer 2 with the connecting flange on the upper edge of the outer peripheral side wall 32, A flange 334 at the upper edge of the peripheral side wall 33 is bonded by a mastic sealer on the back surface of the hood outer 2.

  Similarly to the front horizontal frame portion 3a, the rear horizontal frame portion 3b is bent from the outer peripheral edge of the bottom wall 31 and bent upward from the outer peripheral edge of the bottom wall 31, and is bent from the inner peripheral edge of the bottom wall 31. A shallow cross-section container shape is formed with the inner peripheral side wall 33 standing upward. The bottom wall 31 of the rear horizontal frame portion 3b is substantially parallel to the hood outer 2, and the height of the outer peripheral wall 32 and the inner peripheral wall 33 is substantially the same.

  The inner peripheral side wall 33 of the rear horizontal frame portion 3b is formed in a stepped shape including a lower vertical wall portion 331, a horizontal portion 332, an upper vertical wall portion 333, and a flange 334, similar to that of the front horizontal frame portion 3a. is there. The rear lateral frame portion 3b is formed by superimposing the coupling flange at the upper edge of the outer peripheral side wall 32 on the outer peripheral (rear edge) back surface of the hood outer 2 and performing hemming on the outer peripheral edge of the hood outer 2 and An edge flange 334 is bonded to the back surface of the hood outer 2 with a mastic sealer (not shown).

  As shown in FIG. 4, the longitudinal bone portions 35 and 35 of the hood inner 3 are formed in an inverted hat shape in cross section, and have a width of about 30 mm and are narrower than the horizontal frame portions 3 a and 3 b. The vertical bone portions 35 and 35 are formed so that the bottom wall 351 is flush with the horizontal portion 332 of the horizontal frame portions 3a and 3b, and the left and right flange portions 352 are flush with the flange 334 of the horizontal frame portions 3a and 3b. It is formed in a shape. The vertical bone portions 35, 35 have left and right flange portions 352 bonded to the back surface of the hood outer 2 with a mastic sealer.

  When a pedestrian collides with the engine hood 1 and a collision load F1 is applied on the hood outer 2, a load is applied to the inner peripheral side walls 33 of the front and rear lateral frame portions 3a and 3b of the hood inner 3 via the hood outer 2. The bent portion between the upper vertical wall portion 333 and the horizontal portion 332 of each inner peripheral side wall 33 and the bent portion between the horizontal portion 332 and the lower vertical wall portion 331 are buckled and deformed, and the lower vertical wall portion The bent portion between 331 and the bottom wall 31 is opened and deformed, and the entire inner peripheral side wall 33 is deformed in a crushed downward direction, and the hood outer 2 is bent and deformed in a wide range around the collision point to absorb the impact. To do. Further, when the collision load is large, the bottom wall 31 of each horizontal frame portion 3a, 3b bends along the length direction to efficiently absorb a large impact.

  Since the engine hood 1 of the present embodiment deforms the horizontal frame portions 3a and 3b that are long in the lateral direction in a wide range as compared with the conventional structure in which the short vertical frame portion is deformed to reduce the impact. As shown in FIG. 3, the engine hood 1 is deformed in a wide range in the lateral direction to efficiently absorb the impact and reduce pedestrian damage.

  In addition, since the vertical bone parts 35 and 35 constructed between the front part and the rear horizontal frame parts 3a and 3b are thinned to reduce the rigidity and the number thereof is reduced, they are firmly stretched to stretch the hood outer 2 and the front part. In addition, the deformation of the rear horizontal frame portions 3a and 3b is not hindered. Further, when an excessive collision load is applied to the engine hood 1, the vertical bone portions 35 and 35 are supported to some extent to prevent excessive deformation of the engine hood 1, and the deformed engine hood 1 is placed in the engine room. Prevent bottoming out against the engine and other parts.

  Since the inner peripheral side wall 33 of the front horizontal frame portion 3a is provided at a substantially central position in the front-rear direction of the engine hood 1, the tension of the hood outer 2 can be sufficiently secured together with the inner peripheral side wall 33 of the rear horizontal frame portion 3b. The middle position in the front-rear direction of the engine hood 1 is easy to input a collision load, which is convenient for shock relaxation. In the above-described embodiment, the bending angle of the bent portion between the bottom wall 31 of each of the horizontal frame portions 3a and 3b and the lower vertical wall portion 331 of the inner peripheral side wall 33 is an obtuse angle. However, by setting the bending angle of the bent portion to a right angle or an obtuse angle, the bent portion is easily opened and deformed by a collision load.

It is a reverse view of the engine hood to which the present invention is applied. It is sectional drawing which follows the II-II line of FIG. It is sectional drawing which shows the bending deformation state by the collision of the one side half part of an engine hood in the position which follows the III-III line | wire of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a reverse view of the conventional engine hood. It is sectional drawing which follows the VI-VI line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine hood 2 Hood outer 3 Hood inner 3a Front part horizontal frame part 3b Rear part horizontal frame part 30 Space part 31 Bottom wall 32 Outer peripheral side wall 33 Inner peripheral side wall 331 Lower vertical wall part 332 Horizontal part 333 Upper vertical wall part 334 Flange 35 Vertical bone Part

Claims (6)

In the engine hood structure of an automobile in which a hood inner is provided on the back surface of the hood outer that forms the outer plate of the engine hood of the automobile,
The hood inner is annular along the outer periphery of the hood outer, and has a space portion extending in the vehicle width direction between a front horizontal frame portion along the front end of the hood outer and a rear horizontal frame portion along the rear end of the hood outer. Formed into a shape,
The front horizontal frame portion and the rear horizontal frame portion are erected from the outer peripheral edge of the bottom wall and the upper end is connected to the outer peripheral edge of the hood outer, and the upper end is raised from the inner peripheral edge of the bottom wall. An inner peripheral side wall joined to the back surface of the hood outer;
A lower vertical wall portion standing on the inner peripheral side walls of the horizontal frame portions from the inner peripheral edge, a horizontal portion bent substantially horizontally from the upper end of the lower vertical wall portion, and an upper vertical wall rising from the horizontal portion An engine hood structure for an automobile, characterized in that it is formed in a staircase shape comprising a portion.   2. The engine hood structure for an automobile according to claim 1, wherein the position of the inner peripheral edge of the front horizontal frame is set at a substantially central portion in the front-rear direction of the engine hood.   The engine hood structure for an automobile according to claim 1 or 2, wherein a flange that is bent in a substantially horizontal direction from the upper end and is joined to the back surface of the hood outer by an adhesive is formed at an upper end of the upper vertical wall portion.   The engine hood structure for an automobile according to any one of claims 1 to 3, wherein an angle between the bottom wall and the lower vertical wall portion is a right angle or an obtuse angle.   The engine hood structure for an automobile according to any one of claims 1 to 4, wherein a plurality of thin vertical bone portions are installed in the front-rear direction between the lateral frame portions.   5. The engine hood structure for an automobile according to any one of claims 1 to 4, wherein the engine hood is an automobile engine hood having a length in a vehicle width direction longer than a length in a front-rear direction.

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