JP2016107870A - Vehicle hood structure and integral hood inner panel used for same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle hood structure excellent in sound absorption performance, capable of ensuring pedestrian's head protection performance at a time of a collision with a pedestrian, and avoiding rupture in press forming, and an integral hood inner panel used for the same.SOLUTION: Line length changes (L-L)/L×100 and (L-L)/L×100 of first and second longitudinal wall parts 5 and 8 satisfy the following expressions (1) and (2), respectively, and a plurality of through-holes at a diameter of 0.3 mm to 3.0 mm is provided at least in part of an area inward of a ridge line 10 between a longitudinal wall rising from a bottom surface 11 of an outer periphery of a hood inner panel and a generally annular outer proximate surface 2. (L-L)/L×100≤3% ---- (1), (L-L)/L×100≤6% ---- (2)SELECTED DRAWING: Figure 1

Description

  The present invention relates to an automobile hood structure that is used by mastic joining a hood outer panel and a hood inner panel, and an integrated hood inner panel used therefor.

  An automotive hood is composed of an outer panel, an inner panel, and other reinforcing materials, and is joined so that the outer panel and the inner panel have a closed cross-sectional structure through a space in order to ensure the rigidity and strength of the hood itself. It is common.

  At present, in order to evaluate the pedestrian protection performance at the time of frontal collision, the HIC value (head injury value) calculated from the acceleration-time waveform at the time of collision is generally used, and the smaller the HIC value is, It is said that injury to the pedestrian head is difficult to occur at the time of collision. For this reason, a hood structure in which the HIC value is lowered after securing dent resistance, tension rigidity, rigidity and strength as a hood is desired.

  When the head collides near the center of the hood, the acceleration waveform is the first wave when the head touches the hood at the beginning of the collision, and then the hood moves downward in the car body for the automobile. In general, the second wave is generated when it comes into contact with the built-in component arranged in the box. In order to reduce the HIC value, it is particularly effective to reduce the second acceleration wave. For this purpose, it is best to absorb the collision energy before the hood comes into contact with the built-in component in the case of a head collision, and it is desirable to secure a sufficient gap between the hood and the built-in component under the hood.

  However, considering the arrangement of necessary parts as an automobile, it is often difficult to ensure a sufficient gap between the hood and the built-in parts. For this reason, the first acceleration wave in the head collision is made as large as possible, and the deformation stroke is reduced by increasing the energy absorption amount in the initial stage of the collision, or the second acceleration wave when the hood contacts the built-in component is reduced. Such a hood structure for an automobile is desired.

  Panel parts are located on the front and upper side of the vehicle body, where the engine is often mounted on such an automobile hood structure, and demands for weight reduction are high due to the weight reduction of the automobile itself, reduction of the center of gravity, balance of front and rear weights, etc. . For this reason, aluminum materials that are lighter in weight than conventional steel plates have been used for hood inner panels in automobile hood structures. However, when the aluminum hood inner panel is used, the initial acceleration when the pedestrian head collides is reduced due to its light weight compared to the case where the steel plate hood inner panel is used. Inferior is often a problem.

  In recent years, with the aim of ensuring such pedestrian protection performance, a plurality of substantially hat-shaped beads arranged in parallel with each other are formed near the center of the hood inner panel, and the dent resistance required as a hood structure for automobiles has been formed. Have been proposed that improve the pedestrian protection performance at the time of a frontal collision (see, for example, Patent Documents 1 and 2).

  The features of the hood inner structure disclosed in Patent Documents 1 and 2 described above are that a substantially hat-shaped bead is arranged in a closed cross-sectional structure with a small number of trim parts, so that the bending rigidity of the hood panel increases, and pedestrian head collisions occur. The local bending deformation at the time is suppressed, and the impact load can be dispersed. For this reason, there is a feature that the first wave of acceleration at the time of the head collision becomes larger than the area where the displacement occurs due to the head collision, that is, the weight increases and the bead is not provided. In addition, since the hat-type beads are arranged substantially in parallel, there is an advantage that deformation easily occurs when the inner panel and the built-in component under the hood come into contact with each other, and the second acceleration wave can be reduced. The number of adoption cases increased.

  In addition, the hood structure employs a closed cross-sectional structure, and thus has a feature that the sound insulation performance is superior to a conventional beam structure having a trim portion. For this reason, when it is employed in an aluminum hood that is lightweight and whose quietness is liable to be sacrificed, there is an advantage that it is effective in reducing noise during traveling. In particular, there is a demand for higher quietness even in luxury cars, and the demand for improvement in acoustic performance is becoming stricter.

  Furthermore, there are several proposals for improving the acoustic characteristics of such a hood panel, for example, a proposal of applying a material having excellent sound absorption (see, for example, Patent Documents 3 and 4).

  The technique disclosed in Patent Document 3 is one in which a porous metal such as foamed aluminum is disposed on a part of the back surface of the hood. Further, the technique disclosed in Patent Document 4 is provided with a sound absorbing material and a space on the back surface of the hood.

  In addition, as described below, some proposals have been proposed in which a plurality of through holes are provided in the panel itself to impart sound absorbing performance and improve acoustic performance. These structures have an advantage that the number of parts does not increase because the through hole is set in the hood inner itself (see, for example, Patent Documents 5 to 7).

  The technique disclosed in Patent Document 5 is one in which a large number of through holes having a sound absorbing effect are set in the center portion of the inner panel. Moreover, the technique disclosed in the above-mentioned Patent Document 6 sets a large number of through holes in a reinforcing material arranged under a hood. Further, the technique disclosed in Patent Document 7 is configured to provide a porous plate provided with a fibrous material and a large number of through holes on the back surface of the hood.

  In addition, a structure has been proposed in which the through-hole setting portion is separated, thereby reducing the amount of strain during molding and avoiding breakage by later assembling to the inner panel. In this structure, a separate part in which a through hole is set in a portion having a bead substantially parallel to the center of the vehicle is set, thereby achieving both pedestrian protection performance and sound absorption characteristics (for example, Patent Document 8). reference). The technique disclosed in Patent Document 8 is obtained by joining components having a large number of through holes at the center of the hood.

  Moreover, although the through-hole is not set, the structure which separated the center part is also proposed (for example, refer patent document 9).

JP 2001-151159 A JP 2003-205866 A JP 2005-271655 A Japanese Patent No. 4,114,463 JP 2003-252246 A JP 2003-261070 A JP 2006-199276 A Japanese Patent No. 5,006,319 Japanese Patent No. 4,719,039

  However, in the techniques disclosed in Patent Documents 5 to 7, when a through hole is set in the hood inner, it becomes a problem at what timing to form the through hole. When a through hole is provided after draw molding, there is a problem that trim processing is difficult unless the hole is large to some extent. In this case, since the hole diameter is limited, there is a problem that it is difficult to obtain the target sound absorption performance. In addition, when forming a hood inner shape by press-molding a flat panel provided with small-diameter through holes in advance, deformation concentrates locally in the vicinity of the through holes during draw molding, compared to ordinary materials. There was a problem that the fracture limit was greatly lowered and it was difficult to mold a part having the same structure as the conventional one.

  Further, if the hood central portion as disclosed in Patent Documents 8 and 9 is separated, strain reduction during press molding is possible, and even a panel having a through-hole excellent in the sound absorption characteristics is broken during molding. Is easy to avoid. However, the increase in the number of parts and the welding cost due to the separate body and the increase in the yield of the inner panel are problematic. Moreover, the shape accuracy fall accompanying welding also becomes a problem. For this reason, regarding the hood inner, when setting a small-diameter through hole to ensure acoustic performance, it has been desired to present a shape that can be molded as an integral part.

  An object of the present invention is to provide a hood structure for an automobile that has excellent sound absorption performance, ensures pedestrian head protection performance when colliding with a pedestrian, and avoids breakage in press molding, and an integrated hood used therefor To provide an inner panel.

In order to achieve this object, a hood inner panel of a hood structure for an automobile according to the first invention is
In a hood inner panel of a hood structure for an automobile having a hood outer panel and a hood inner panel,
The hood inner panel has a substantially annular outer proximity surface that is mastic bonded to the hood outer panel,
Inside the substantially annular outer proximity surface, there are provided a plurality of beads that are substantially parallel to each other and project downward from the outer proximity surface,
It has a first bottom at both ends in the longitudinal direction of the bead, a second bottom at the center,
At both end portions in the longitudinal direction of the bead, there are first vertical wall portions that form a substantially truncated cone shape from the outer proximity surface toward the first bottom portion,
A second vertical wall portion continuously provided in the vehicle width direction from the outer proximity surface to the second bottom portion along the longitudinal direction of the bead; and the first vertical wall portion and the first vertical wall portion 2 vertical walls, or the first bottom and the second bottom are connected continuously,
The line length changes (L ₁ −L ₀₁ ) / L ₀₁ × 100 and (L ₂ −L ₀₂ ) / L ₀₂ × 100 of the first and second vertical wall portions are the following formulas (1) and (2), respectively. ) And a plurality of penetrations having a diameter of 0.3 mm to 3.0 mm in at least a part of the inner region of the ridgeline between the vertical wall rising from the bottom surface of the outer periphery of the hood inner panel and the substantially annular outer proximity surface A hood inner panel having a hood structure for an automobile, wherein a hole is provided.
(L ₁ −L ₀₁ ) / L ₀₁ × 100 ≦ 3 %% (1)
(L ₂ −L ₀₂ ) / L ₀₂ × 100 ≦ 6% −−−− (2)
L ₁ : Length of the first vertical wall portion extending from the outer proximity surface toward the first bottom portion L ₂ : Length of the second vertical wall portion extending from the connection plane toward the second bottom portion L ₀₁ : First Plan view length of the vertical wall portion L ₀₂ : Plan view length of the second vertical wall portion

The hood inner panel of the hood structure for automobiles according to the second invention is the hood inner panel of the hood structure for automobiles according to the first invention,
The inclination angle θ ₁ of the first vertical wall portion is made smaller than the inclination angle θ ₂ of the second vertical wall portion, or the depth from the outer proximity surface of the first vertical wall portion to the first bottom portion the h ₁ than the connecting surfaces of the second vertical wall portion at a depth h ₂ until the second bottom, characterized in that small.

The hood inner panel of the automobile hood structure according to the third invention is a hood inner panel of the automobile hood structure according to the second invention,
When the second vertical wall portion orthogonal to and opposed to the longitudinal direction of the bead has a substantially V-shaped structure and the plan view length is 2 × L ₀₁ , the depth h ₁ is expressed by the following formula (3 ) Is satisfied.
h ₁ ≦ (0.18 × L ₀₁ ) −1 −−−− (3)

  A vehicle hood structure according to a fourth aspect of the present invention is a vehicle hood structure having a reinforcing member between a hood inner panel of the vehicle hood structure according to any one of the first to third aspects of the invention and the hood outer panel. It is.

As described above, the present invention
The hood inner panel has a substantially annular outer proximity surface that is mastic bonded to the hood outer panel,
Inside the substantially annular outer proximity surface, there are provided a plurality of beads that are substantially parallel to each other and project downward from the outer proximity surface,
It has a first bottom at both ends in the longitudinal direction of the bead, a second bottom at the center,
At both end portions in the longitudinal direction of the bead, there are first vertical wall portions that form a substantially truncated cone shape from the outer proximity surface toward the first bottom portion,
A second vertical wall portion continuously provided in the vehicle width direction from the outer proximity surface to the second bottom portion along the longitudinal direction of the bead; and the first vertical wall portion and the first vertical wall portion 2 vertical walls, or the first bottom and the second bottom are connected continuously,
The line length changes (L ₁ −L ₀₁ ) / L ₀₁ × 100 and (L ₂ −L ₀₂ ) / L ₀₂ × 100 of the first and second vertical wall portions are the following formulas (1) and (2), respectively. ) And a plurality of penetrations having a diameter of 0.3 mm to 3.0 mm in at least a part of the inner region of the ridgeline between the vertical wall rising from the bottom surface of the outer periphery of the hood inner panel and the substantially annular outer proximity surface Because the hole is provided,
It is possible to realize an automotive hood structure that has excellent sound absorption performance, protects the pedestrian's head when it collides with a pedestrian, and avoids breakage during press molding, and the integrated hood inner panel used for this. is there.
(L ₁ −L ₀₁ ) / L ₀₁ × 100 ≦ 3 %% (1)
(L ₂ −L ₀₂ ) / L ₀₂ × 100 ≦ 6% −−−− (2)

  As described above, in the inner region of the ridge line between the vertical wall rising from the bottom surface of the outer periphery of the hood inner panel provided with the through hole and the substantially annular outer proximity surface, the outer proximity surface is substantially parallel to and below the outer proximity surface. Although a plurality of beads projecting in the direction are provided, the line length change of the first and second vertical wall portions is suppressed to a line length change that satisfies the above expressions (1) and (2). The through-hole setting portion is provided with a plurality of beads that are set in advance in the flat hood inner panel and are substantially parallel to each other and projecting downward from the outer proximity surface. It is possible to prevent a concentrated load from being applied, and to avoid breakage.

  The plurality of beads ensure the rigidity of the hood inner panel itself and contribute to the improvement of pedestrian protection performance. In addition, the plurality of beads projecting downward from the outer proximity surface do not stick to the front-rear direction or the vehicle width direction of the vehicle as long as they are substantially parallel to each other, and have a curved shape. Also good.

  Since a plurality of through holes having a diameter of 0.3 mm to 3.0 mm are provided in at least a part of the inner region from the ridgeline between the vertical wall rising from the bottom surface of the outer periphery of the hood inner panel and the substantially annular outer proximity surface. In combination with the air layer between the hood outer panel and the plurality of beads, the sound absorption performance is excellent (sound of a predetermined frequency can be absorbed).

It is a model perspective view (state which removed the hood outer panel) of the hood inner panel of the hood structure for cars of an embodiment of the present invention. It is BB sectional drawing of the food inner panel shown in FIG. It is AA sectional drawing of the food inner panel shown in FIG. FIG. 6 is a comparative diagram comparing the elongation of a perforated plate (equivalent to a vertical wall portion of the present invention (with through holes)) and a normal plate (without through holes). It is a schematic cross section for demonstrating the through-hole provided in the 2nd vertical wall part of the hood inner panel shown in FIG.

  Hereinafter, the present invention will be described in detail while illustrating embodiments.

(Embodiment)
1 is a schematic perspective view of a hood inner panel of a hood structure for an automobile according to an embodiment of the present invention (with a hood outer panel removed), FIG. 2 is a BB cross-sectional view of the hood inner panel shown in FIG. 1, and FIG. AA sectional view of the hood inner panel shown in FIG. 4, FIG. 4 is a comparative view comparing the elongation of a perforated plate {equivalent to the vertical wall portion of the present invention (with through holes)} and a normal plate (without through holes), FIG. It is a schematic cross section for demonstrating the through-hole provided in the 2nd vertical wall part of the hood inner panel shown in FIG.

  1 to 5, 1 is a hood inner panel, 2 is a hood inner panel 1, and is a substantially annular outer surface (consisting of two 2a and two 2b) that is mastically joined to a hood outer panel. A plurality of beads 4, which are perpendicular to the vehicle traveling direction and are substantially parallel to each other inside the substantially annular outer proximity surface 2, and project downward from the outer proximity surface 2, are at both end portions in the longitudinal direction of the bead 3. The first bottom surface as the first bottom portion, 7 is the second bottom surface as the second bottom portion in the center portion in the longitudinal direction of the bead 3, and 5 is the first bottom surface from the outer proximity surface 2a to both end portions in the longitudinal direction of the bead 3. A plurality of first vertical wall portions 6, which are provided toward 4, are formed so as to be continuous from the outer proximity surface 2 a along the longitudinal direction of the bead 3 in the same plane as the outer proximity surfaces 2 a and 2 b. Connection plane (this surface also functions as an outer proximity surface for performing mastic bonding), 8 is connected to the first bottom wall 5 from the plurality of connection planes 6 toward the second bottom surface 7 respectively. 2 is a second vertical wall portion provided on the outer peripheral surface of the hood inner panel 1, 10 is a ridge line between the vertical wall rising from the outer peripheral bottom surface 11 of the hood inner panel 1 and the substantially annular outer proximity surface 2, 9 is These are a plurality of through-holes having a diameter of 0.3 mm to 3.0 mm provided in a region inside the ridge line 10. In FIG. 1, the hood outer panel is not shown.

FIG. 2 is a BB cross-sectional view of the hood inner panel 1 shown in FIG. 1 and is for explaining a change in line length (L ₁ −L ₀₁ ) / L ₀₁ × 100 of the first vertical wall portion 5. Here, L ₁ is the length of the first vertical wall 5 extending from the outer proximity surface 2 a toward the first bottom surface 4, and L ₀₁ is the plan view length of the first vertical wall 5. FIG. 3 is a cross-sectional view taken along line AA of the hood inner panel 1 shown in FIG. 1 for explaining the change in line length (L ₂ −L ₀₂ ) / L ₀₂ × 100 of the second vertical wall portion 8. . Here, L ₂ is the length of the second vertical wall 8 extending from the connection plane 6 toward the second bottom surface 7, and L ₀₂ is the plan view length of the second vertical wall 8.

In this embodiment, the depth h ₁ from the outer proximity surface 2a of the first vertical wall 5 to the first bottom surface 4 and the connection plane 6 of the second vertical wall 8 shown in FIGS. 2 and 3 respectively. from to the second bottom surface 7 the depth h ₂ is equal. That is, the bottom part of the bead 3 becomes the same plane.

  FIG. 4 is a comparative view comparing the elongation of a perforated plate (equivalent to the vertical wall portions 5 and 8 (with through holes) of the present invention) and a normal plate (without through holes). From FIG. 4, the elongation of the normal plate (without through holes) is about 0.25 (25%), whereas the elongation of the perforated plate {equivalent to the vertical wall portions 5 and 8 (with through holes) of the present invention}. Was found to be about 0.09 (9%) (ie, the inventors investigated the fracture limit of the perforated plate and found that the fracture limit strain was about 9%). When there is a through-hole 9 (provided in the second vertical wall portion 8) as shown in FIG. 5, even if the condition structure does not set the bead 3, it is about 3 when molding the outer periphery. The inventors have newly found that the amount of strain accompanying the cross-sectional change in the AA cross section of the bead 3 needs to be at least 6% or less in consideration of this because a strain of% is added.

Therefore, when the depth h ₁ is equal to the depth h ₂ (that is, the bottom surface of the bead 3 is the same plane) as in this embodiment, the pedestrian head protection performance when colliding with a pedestrian is achieved. In order to ensure and avoid breakage in press forming, the inclination angle θ ₁ of the first vertical wall portion 5 is made smaller than the inclination angle θ ₂ of the second vertical wall portion 8, and the following equation (1): It is necessary to satisfy Expression (2).
(L ₁ −L ₀₁ ) / L ₀₁ × 100 ≦ 3 %% (1)
(L ₂ −L ₀₂ ) / L ₀₂ × 100 ≦ 6% −−−− (2)

If the inclination angle θ ₁ and the inclination angle θ ₂ are equal, the depth h ₁ is made smaller by changing gently or steeply than the depth h _2. It is necessary to satisfy Expression (2).

In the present embodiment, the case where there is a bottom surface having the first bottom surface 4 and the second bottom surface 7 as shown in FIG. 1 is described, but the present invention is not limited to this. That is, it is desirable that the bead has a shape as deep as possible from the viewpoint of securing rigidity and securing a primary acceleration peak during a pedestrian head collision. In consideration of this, the cross-sectional shape of the bead can be a substantially triangular shape that protrudes downward with few bottom surfaces, so that the bead depth can be maximized without increasing the bead line length. desirable. This condition is satisfied when, for example, a substantially V-shaped structure is formed between the second vertical wall portions orthogonal to and opposed to the longitudinal direction of the bead, and the depth in plan view is 2 × L _01. The length h ₁ satisfies the following formula (3).
h ₁ ≦ (0.18 × L ₀₁ ) −1 −−−− (3)

  Moreover, in order to give the material itself a pedestrian head protection performance and satisfy the formability to the hood inner panel, an Al-Mg-Si-based AA to JIS-based 6000 series aluminum alloy plate is used. It is preferable. Assuming that this 6000 series aluminum alloy plate is molded into a hood inner panel, then subjected to a paint bake hardening process and used for a vehicle body, 170 ° C. × 20 after applying 2% pre-strain. It is preferable that the 0.2% proof stress is 80 to 225 MPa as a characteristic after the artificial age hardening treatment for 3 minutes.

  And when such a 6000 series aluminum alloy plate is used, the preferable board thickness t of the hood inner panel for exhibiting the said various performances is the range of about 0.6 mm to 1.2 mm.

In the present embodiment, a plurality of connection planes 6 are formed in the longitudinal direction of the bead 3 so as to be continuous in the same plane as the outer proximity surfaces 2 a and 2 b from the outer proximity surface 2 a along the longitudinal direction of the bead 3. A second bottom wall 7 as a second bottom in the central portion, a second vertical wall 8 provided so as to be connected to the first bottom wall 7 from each of the plurality of connection planes 6 toward the second bottom 7. Although only the configuration in which the through hole 9 is provided in the above has been described, the present invention is not limited to this. A plurality of through holes 9 having a diameter of 0.3 mm to 3.0 mm are provided in at least a part of the inner region of the ridgeline 10 between the vertical wall rising from the bottom surface 11 on the outer periphery of the hood inner panel 1 and the substantially annular outer proximity surface 2. It only has to be done. The size of the through hole 9 is in the above-described range, and the number of the through holes 9 is designed according to the level of sound absorption performance. Further, from the viewpoint of sound absorbing performance, it is more desirable to set the gap between the hood outer panel, the substantially annular outer proximity surface 2 and the connection plane 6 to 3 mm or more.
However, in the outer region from the ridge line 10, the depth from the substantially annular outer proximity surface 2 to the bottom surface 11 of the outer periphery of the hood inner panel 1 is deep, and the overhang amount is limited like the inner region of the ridge line 10. However, distortion that exceeds the breaking limit near the through hole 9 occurs. For this reason, it is necessary to set the through-hole 9 only in a region inside the ridge line 10 of the substantially annular outer proximity surface 2.

DESCRIPTION OF SYMBOLS 1 Hood inner panel 2 The substantially annular outer proximity | contact surface 2a, 2b Outer proximity | contact surface 3 Bead 4 1st bottom face 5 1st vertical wall part 6 Connection plane 7 2nd bottom face 8 2nd vertical wall part 9 Through-hole 10 Ridge line 11 Hood inner Bottom of the outer periphery of panel 1

Claims (4)

In a hood inner panel of a hood structure for an automobile having a hood outer panel and a hood inner panel,
The hood inner panel has a substantially annular outer proximity surface that is mastic bonded to the hood outer panel,
Inside the substantially annular outer proximity surface, there are provided a plurality of beads that are substantially parallel to each other and project downward from the outer proximity surface,
It has a first bottom at both ends in the longitudinal direction of the bead, a second bottom at the center,
At both end portions in the longitudinal direction of the bead, there are first vertical wall portions that form a substantially truncated cone shape from the outer proximity surface toward the first bottom portion,
A second vertical wall portion continuously provided in the vehicle width direction from the outer proximity surface to the second bottom portion along the longitudinal direction of the bead; and the first vertical wall portion and the first vertical wall portion 2 vertical walls, or the first bottom and the second bottom are connected continuously,
The line length changes (L ₁ −L ₀₁ ) / L ₀₁ × 100 and (L ₂ −L ₀₂ ) / L ₀₂ × 100 of the first and second vertical wall portions are the following formulas (1) and (2), respectively. ) And a plurality of penetrations having a diameter of 0.3 mm to 3.0 mm in at least a part of the inner region of the ridgeline between the vertical wall rising from the bottom surface of the outer periphery of the hood inner panel and the substantially annular outer proximity surface A hood inner panel having a hood structure for an automobile, wherein a hole is provided.
(L ₁ −L ₀₁ ) / L ₀₁ × 100 ≦ 3 %% (1)
(L ₂ −L ₀₂ ) / L ₀₂ × 100 ≦ 6% −−−− (2)
L ₁ : Length of the first vertical wall portion extending from the outer proximity surface toward the first bottom portion L ₂ : Length of the second vertical wall portion extending from the connection plane toward the second bottom portion L ₀₁ : First Plan view length of the vertical wall portion L ₀₂ : Plan view length of the second vertical wall portion The inclination angle θ ₁ of the first vertical wall portion is made smaller than the inclination angle θ ₂ of the second vertical wall portion, or the depth from the outer proximity surface of the first vertical wall portion to the first bottom portion hood inner panel of the automotive engine hood structure according to claim 1, characterized in that the smaller than the h ₁ to the depth h ₂ from the connection plane of the second vertical wall portion to the second bottom. When the second vertical wall portion orthogonal to and opposed to the longitudinal direction of the bead has a substantially V-shaped structure and the plan view length is 2 × L ₀₁ , the depth h ₁ is expressed by the following formula (3 The hood inner panel of the automobile hood structure according to claim 2, wherein:
h ₁ ≦ (0.18 × L ₀₁ ) −1 −−−− (3)   The hood structure for motor vehicles which provided the reinforcement member between the hood inner panel of the hood structure for motor vehicles of any one of Claims 1-3, and the said hood outer panel.

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