JP2004322985A - Engine hood structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine hood structure capable of improving shock absorbing performance for applied collision load. <P>SOLUTION: This engine hood structure of a vehicle is constituted in such a way that an outer frame part 30 along an outer peripheral part of a hood outer 3 and a hood inner 3 composed of a plurality of middle frame parts 31, 32 stretched between the outer frame parts 30 by crossing them mutually are provided on a rear surface side of a hood outer 2 constituting an outer plate of an engine hood 1, and the hood outer 2 is received by the middle frame parts 31, 32 of the hood inner 3 when collision load acts on the hood outer 2 from above. Frame width of the middle frame part 31 on one side among the mutually crossing middle frame parts 31, 32 of the hood inner 3 is formed to be smaller than the frame width of the middle frame part 32 on the other side. Difference in strength is provided between both the middle frame parts 31 and 32 to deform each middle frame part 31, 32 stepwise by collision load acting from above. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an engine hood structure for opening and closing an engine room of a vehicle.
[0002]
[Prior art]
FIG. 8 shows a rear view of an engine hood of a general vehicle. An engine hood 1B is provided on the back of a hood outer 2 serving as an outer plate, and is provided between the outer frame 30 along the outer peripheral portion of the hood outer 2. A frame-shaped hood inner 3B having a plurality of formed middle frame portions 31b, 32b, 39 is additionally provided. In the hood inner 3B, the outer frame portion 30 and each of the middle frame portions 31a, 32b, and 39 have an inverted hat shape in cross section, and both edge flanges are adhered to the back surface of the hood outer 2 to form a closed cross section with the hood outer 2. In addition, the stiffness of the hood outer 2 is secured. In particular, a plurality of middle frame portions 31b, 32b provided in an inclined manner intersect with the front and rear direction of the engine hood 1B so as to effectively reinforce the stiffness of the hood outer 2 with a small number of middle frame portions. I am trying to do it.
[0003]
By the way, when an external object such as a pedestrian hits the engine hood 1 from above in a collision accident, the engine hood 1B actively deforms the engine hood 1B due to the collision load, and receives an impact received by the external object. Although it is necessary to absorb the impact, at the intersection where the plurality of middle frame portions 31b and 32b intersect, the rigidity against the collision load is high, and the impact absorption performance is low.
[0004]
Therefore, conventionally, in order to improve the impact absorption performance, a through hole is formed at the center of the connecting portion where the bottom walls of both the middle frames are continuous at the intersection where the plurality of middle frames are crossed, A through hole is formed at the center of the connecting part where the side walls of the frame part are continuous to reduce the strength of the above-mentioned intersection part, and the intersection part of both middle frame parts is easily deformed by the collision load to absorb the impact. (For example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-5-155355
[Problems to be solved by the invention]
However, in the conventional structure in which the intersection of the middle frame portions of the hood inner is weakened, the strength of each of the middle frame portions decreases, and when a collision load is applied, the respective middle frame portions are simultaneously bent and deformed. The deformation speed at the time of deformation is high, and the deformation stroke may be large. If the deformation stroke is large, the engine and other parts in the engine room will bottom out. Accordingly, an object of the present invention is to provide an engine hood structure of a vehicle that can exhibit high impact absorption performance with a small deformation stroke.
[0007]
[Means for Solving the Problems]
The present invention provides a hood comprising, on a back side of a hood outer forming an outer plate of an engine hood, an outer frame along an outer peripheral portion of the hood outer, and a plurality of middle frames interposed between the outer frames to cross each other. In the engine hood structure of a vehicle in which the inner is installed and receives the hood outer at the inner frame of the hood inner when a collision load acts on the hood outer from above, one of the intersecting inner frame portions of the hood inner is The frame width of the middle frame portion is formed to be narrower than the frame width of the other middle frame portion, so that a difference in strength is provided between the two middle frame portions. When a collision load acts on the hood outer from above, first, one of the narrow inner frames is flexed and deformed, and then the other inner frame is flexed and deformed to absorb the impact step by step. And the deformation stroke can be reduced.
[0008]
The one narrow middle frame portion is provided with an easily deformable portion near the intersection with the other middle frame portion (claim 2). The shock absorbing performance at the beginning of the collision can be improved.
[0009]
The outer frame side portion of the outer frame portion of the hood inner along the left and right side edges of the hood outer is easily deformed to a substantially linear position extending in the width direction of the engine hood through the easily deformable portion of the middle frame portion. When an impact load acts on the engine hood from the front, the easily deformable portion of the outer frame side portion and the easily deformable portion of the middle frame portion are deformed to deform the engine hood along the straight line. (Claim 3). The easily deformable portion of the middle frame portion has a function of absorbing shock for any collision load corresponding to the collision load acting on the engine hood from above and the collision load acting on the engine hood from the front. Demonstrate.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment in which the present invention is applied to an engine hood of a semi-bonnet type wagon vehicle will be described with reference to FIGS. In particular, the present embodiment is designed to improve the shock absorbing performance on both left and right sides in the width direction of the engine hood. FIG. 1 (A) is a diagram showing the back surface of the engine hood of the semi-bonnet type wagon. The engine hood 1 has a rectangular shape that is long in the vehicle width direction and slightly curved in a bow shape, and is a flat plate that forms an outer plate. And a frame-shaped hood inner 3 attached to the back surface of the hood outer 2 so as to reinforce the tightness of the hood outer 2.
[0011]
The hood inner 3 includes an annular outer frame portion 30 formed along the back surface of the outer peripheral portion of the hood outer 2, and a front frame and an outer frame that form a front edge of the outer frame portion 30 at positions inside the outer frame portion 30. The plurality of middle frame portions extending between the rear frame forming the rear edge of the portion 30 and the plurality of middle frame portions are constituted by a metal plate body that is integrally press-formed.
[0012]
As shown in FIGS. 1 and 3, the outer frame portion 30 of the hood inner 3 has only the outer peripheral edge 301 joined to the outer peripheral edge of the hood outer 2, while the inner peripheral edge 302 is separated from the back surface of the hood outer 2. Thus, an open sectional structure in which the inner peripheral edge 302 side is opened is formed. Further, a plurality of tongue-shaped projecting pieces 303 projecting from the inner peripheral edge 302 of the outer frame 30 to the side of the hood outer 2 at an interval, and are provided on the back surface of the hood outer 2 with an adhesive such as a mastic sealer. It is bound by agent 8.
[0013]
The outer frame portion 30 separates the inner peripheral edge 302 and the hood outer 2 so that when a collision load acts on the hood outer 2 from above, the hood outer 2 does not prevent the hood outer 2 from bending and deforming downward. Further, the downward deformation of the hood outer 2 causes the plurality of protruding pieces 303 protruding from the inner peripheral edge 302 to be crushed and deformed to absorb an impact.
[0014]
As shown in FIGS. 1, 2, and 3, as the middle frame of the hood inner 3, the outer frame 30 is positioned on the left and right sides inside the outer frame 30 from the position near the center of the front frame of the outer frame 30. A first middle frame portion 31 that extends in an inclined manner toward a position near the side end of the rear frame 30 is formed. Further, the outer frame portion 30 extends in an inclined manner from a position near the side edge of the front frame to a position near the center of the rear frame of the outer frame portion 30 and intersects with the first middle frame portion 31. A second middle frame 32 is formed. Both ends in the longitudinal direction of the first and second middle frame portions 31 and 32 are integrally connected to inner peripheral edges 302 of the front and rear frames of the outer frame portion 30. The first and second middle frame portions 31 and 32 are connected to each other at an intersecting portion 33. The two middle frame portions 31 and 32 support each other to increase the supporting force and reinforce the stiffness of the hood outer 2. .
[0015]
Each of the first and second middle frame portions 31 and 32 has a shallow cross-section substantially inverted hat shape opening toward the hood outer 2 side, and the side wall portions 34 on both sides in the frame width direction are formed between the upper edges. The cross section is formed in a substantially inverted C shape so that the interval is larger than the width of the bottom wall portion 35. The first middle frame portion 31 and the second middle frame portion 32 are configured such that the frame width W1 of the first middle frame portion 31 is about half to three times the frame width W2 of the second middle frame portion 32. The width of the first middle frame 31 is made smaller than the strength of the second middle frame 32 by forming the second middle frame 31 with a narrow width of about two-half.
[0016]
The first and second middle frame portions 31 and 32 are respectively arranged along the back surface of the hood outer 2, and the side edge flanges 36 on both sides of the middle frame portions 31 and 32 in the frame width direction are respectively connected to the back surface of the hood outer 2. A plurality of places facing each other at a certain interval in the longitudinal direction of the side edge flanges 36 are joined to the back surface of the hood outer 2 with an adhesive 8 such as a mastic sealer.
[0017]
As shown in FIG. 1, a plurality of third middle frame portions extending in the front-rear direction between the front frame and the rear frame of the outer frame portion 30 of the hood inner 3 are provided at the center in the width direction of the engine hood 1. 39 are formed. Each of the third middle frame portions 39 has a shorter front-to-rear length and tends to have higher rigidity against a collision load from above, so that the hat-shaped cross-sectional shape with a smaller frame width does not increase the rigidity more than necessary. I have. Particularly, in the third middle frame portion 39, the member located at the center has the opening of the hat-shaped cross section facing downward, and a plurality of locations on the top surface are bonded to the back surface of the hood outer 2 with an adhesive.
[0018]
In the engine hood 1, both left and right ends of a rear frame of the outer frame portion 30 of the hood inner 3 are attached to a vehicle body by hinge members (not shown) so that an engine room opening can be opened and closed. When the engine compartment is closed, the engine hood 1 locks the striker 9 provided at the center of the front frame of the outer frame portion 30 of the hood inner 3 by engaging with a latch of a lock mechanism at an opening edge of an unillustrated engine compartment.
[0019]
In the engine hood 1 of the present embodiment, an external object collides with both widthwise sides of the engine hood 1 reinforced by the intersecting first and second middle frame portions 31 and 32, and a collision load is applied to the hood outer 2 from above. When acting (white arrow F1 in FIG. 3), the plate surface around the collision point of the hood outer 2 is bent downward and presses the first and second middle frame portions 31, 32 downward. . At this time, the first and second middle frame portions 31 and 32 that have received the downward pressing force provide a difference in strength between the first middle frame portion 31 and the second middle frame portion 32, and Since the strength of the first middle frame portion 31 is weaker than that of the middle frame portion 32, first, the first middle frame portion 31 is bent and deformed by the above pressing force, and then the second middle frame portion 32 is deformed. It bends and deforms. By sequentially deforming the first middle frame portion 31 and the second middle frame portion 32 in this manner, the impact at the time of collision can be absorbed stepwise, and the hood outer 2 and the middle frame can be compared with the conventional structure. Since the deformation speed of the portions 31 and 32 is reduced and the deformation stroke can be reduced, it is possible to prevent bottoming at the time of collision.
[0020]
For example, even if an object outside the vehicle collides with a position immediately above the second middle frame portion 32, the first middle frame portion 31 having low strength among the first and second middle frame portions 31 and 32 that support each other may be used. First, the second middle frame portion 32 which has bends due to the collision load and starts to bend and deforms, and then the second middle frame portion 32 which has no support is bent and deformed, thereby substantially absorbing the impact at the time of the collision in a stepwise manner.
[0021]
At the center in the width direction of the engine hood 1, when a collision load is applied from above, the third middle frame portion 39 bends and deforms downward to absorb the impact. The number of the third middle frame portions 39, the frame width, and the cross-sectional shape are set so that the shock absorbing performance at the time of collision between the both sides and the central portion of the engine hood 1 is substantially equal. It is desirable to make the overall shock absorbing performance substantially uniform.
[0022]
Next, a second embodiment of the present invention will be described with reference to FIGS. The basic structure is almost the same as that of the first embodiment, and different points will be mainly described. In the drawings, the same members are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 4 to FIG. 6, the first inner frame portion 31 a having a small frame width of the hood inner 3 </ b> A is located at both sides of the intersection 33 with the second intermediate frame portion 32 due to a collision load. A plurality of easily deformable portions 37 that are easily deformed are formed.
[0023]
Each of the easily deformable portions 37 bulges the plate surface of the bottom wall portion 35 of the first middle frame portion 31a upward, forms a bead shape having a substantially inverted U-shaped cross section that opens downward, and has a bottom wall portion 35. Is formed across the entire width thereof. The pitch between the easily deformable portions 37 is wider than the frame width of the second middle frame portion 32, and each easily deformable portion 37 is provided at a position outside the both side walls 34 of the second middle frame portion 32. is there.
[0024]
As shown in FIG. 4, a plurality of first middle frame portions 31a provided on both right and left sides of the engine hood 1A are provided substantially symmetrically with respect to the engine hood 1A, and the first middle frame portions 31a are easily deformed. The portion 37 is provided at a symmetric position. Further, of the plurality of easily deformable portions 37 provided on each first middle frame portion 31a, the easily deformable portion 37 on the front edge side of the engine hood 1A is provided at a substantially central position in the front-rear direction of the engine hood 1A.
[0025]
Further, the engine hood 1A passes through the easily deformable portion 37 on the front edge side of the first middle frame portion 31a to the outer frame side portion 30a of the outer frame portion 30 of the hood inner 3A along the side edge of the hood outer 2. At the position on the straight line S extending in the width direction of the engine hood 1A, an easily deformable portion 38 is formed in which the plate surface of the outer frame side portion 30a is formed to have substantially the same shape as the above easily deformable portion 37. Furthermore, the plate surface of the third middle frame portion 39 at the position on the straight line S is substantially the same as the easily deformable portion 37 at the plurality of third middle frame portions 39 installed at the center in the width direction of the engine hood 1A. An easily deformable portion 38 having the same shape is formed.
[0026]
According to the engine hood 1A, since the easily deformable portion 37 is provided in the first middle frame portion 31a, the intersection of a plurality of middle frame portions that intersect each other is weakened as in the conventional structure, and both middle frame portions are caused by a collision load. Are not simultaneously deformed, but when a collision load from above acts on the first and second middle frame portions 31a and 32, first, the easily deformable portion 37 of the first middle frame portion 31a closes its lower end opening. The first middle frame portion 31a is bent and deformed as a whole due to the opening deformation, and thereafter, the second middle frame portion 32 is bent and deformed. Therefore, the impact can be more reliably absorbed over more stages.
[0027]
Further, since the easily deformable portion 37 of the first middle frame portion 31a starts the opening deformation from the beginning of the collision, the shock absorbing performance at the beginning of the collision can be improved. In particular, when the collision load is applied from a position immediately above the second middle frame portion 32, the supporting force of the first middle frame portion 31a that supports the second middle frame portion 32 by the easy deformation portion 37 being opened and deformed. Is reliably shut off, and the second middle frame portion 32 is deformed at an earlier stage to exhibit high shock absorbing performance.
[0028]
Further, the engine hood 1A is located at a position on a straight line S extending in the width direction of the engine hood 1A through the easily deformable portion 37 of the first middle frame portion 31a and the easily deformable portion 38 of the outer frame side portion 30a and the third Since the easily deformable portion 38 of the middle frame portion 39 is provided, as shown in FIG. 7, when a collision load (white arrow F2) acts on the front edge of the engine hood 1A from the front, each of the easily deformable portions 37, 38. The lower end opening of the engine hood 1A is closed so that the engine hood 1A can be bent and deformed so that the straight line S becomes a bent portion so as to form a chevron upward in the front-rear direction. . Therefore, the easily deformable portion 37 of the first middle frame portion 31a is provided when the collision load acts on the engine hood 1A from above and when the collision load acts on the engine hood 1A from the front. It has the effect of shock absorption.
[0029]
【The invention's effect】
Advantageous Effects of Invention According to the present invention, a plurality of middle frames intersecting the hood inner of the engine hood are provided with strength differences between the respective middle frames, and when a collision load is applied to the two middle frames from above, the two middle frames are provided. Since the portion is deformed stepwise without being deformed at the same time, and the impact at the time of collision is absorbed stepwise, the deformation stroke at the time of deformation can be reduced, and high shock absorbing performance can be exhibited. Further, by providing the easily deformable portion in the middle frame portion having low strength among the intersecting middle frame portions, it is possible to further improve the shock absorbing performance at the time of collision.
[Brief description of the drawings]
FIG. 1 is a rear view of an engine hood showing a first embodiment of the present invention.
FIG. 2 is a perspective view of a main part of a plurality of intersecting middle frame portions used in the first embodiment.
FIG. 3 is a sectional view taken along the line III-III in FIG. 1;
FIG. 4 is a rear view of an engine hood according to a second embodiment of the present invention.
FIG. 5 is a perspective view of a main part of a plurality of intersecting middle frame portions used in the second embodiment.
FIG. 6 is a sectional view taken along the line VI-VI in FIG. 4;
FIG. 7 is a perspective view showing a deformed state when a collision load acts on the engine hood of the second embodiment from the front.
FIG. 8 is a rear view of a conventional engine hood.
[Explanation of symbols]
1, 1A engine hood 2 hood outer 3, 3A hood inner 30 outer frame portion 30a outer frame side portions 31, 31a one middle frame portion (first middle frame portion)
32 Other middle frame (second middle frame)
33 Intersecting part 37 Easy deformation part of one middle frame part 38 Easy deformation part of outer frame side part

Claims (3)

On the back side of the hood outer forming the outer plate of the engine hood, a hood inner including an outer frame portion along the outer peripheral portion of the hood outer and a plurality of middle frame portions erected so as to cross each other between the outer frame portions is installed. An engine hood structure of a vehicle that receives the hood outer at the middle frame of the hood inner when a collision load acts on the hood outer from above,
A structure in which, among the middle frame portions intersecting each other of the hood inner, the frame width of one middle frame portion is formed to be narrower than the frame width of the other middle frame portion, and a strength difference is provided between both middle frame portions. An engine hood structure for a vehicle. 2. The engine hood structure for a vehicle according to claim 1, wherein the one narrow middle frame portion is provided with an easily deformable portion near an intersection with the other middle frame portion. The outer frame side of the outer frame portion of the hood inner along the left and right side edges of the hood outer is easily deformed to a substantially linear position extending in the width direction of the engine hood through the easily deformable portion of the middle frame portion. When an impact load acts on the engine hood from the front, the easily deformable portion of the outer frame side portion and the easily deformable portion of the middle frame portion are deformed to deform the engine hood along the straight line. 3. The engine hood structure for a vehicle according to claim 2, wherein the engine hood structure is configured to cause the engine hood to rotate.

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