JP3322374B2 - Car hood structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hood structure of an automobile, and more particularly to a shock absorbing structure of an hood of an automobile.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show a conventional front hood 20 for covering an engine room 19 of an automobile. The front hood 20 is formed by joining an outer panel 21 and an inner panel 22 into a closed sectional shape. It consists of The inner panel 22 constituting the back surface of the front hood 20 is formed with bent portions 23 on both left and right sides thereof, thereby improving the strength of the front hood 20. As shown in FIG. 7, the protruding portion 23 has a frame portion 23a extending along a substantially rectangular outline and a diagonal portion 23b extending substantially along a diagonal line.

[0003] The inner panel 22 of the front hood 20 is provided with low-strength portions 24 a, 24 b and 24 c for shock absorption in association with the protruding portion 23. That is,
Among the protruding portions 23, low strength portions 24 a and 24 b made of a concave bent bead (bent portion) are provided on a side portion and a diagonal portion 23 b of the frame portion 23 a and the frame portion 23 is provided.
A low-strength portion 24c is provided at a central portion of the inner panel 22 adjacent to a. In addition, these low strength parts 2
4a, 24b, 24c are arranged at intervals on a line along the left-right direction at an intermediate point α in the front-rear direction of the front hood 20 (see FIG. 7).

As shown in FIG. 8, a hinge member 25 is fastened and fixed to a rear end edge of the front hood 20 with bolts 26, and the front hood 20 is connected to the vehicle body (shown in FIG. H) attached to the hinge shaft 2
7 to be rotatable. In FIG. 8, reference numeral 28 denotes a windshield.

[0005] Thus, when an excessive impact force F is applied to the front hood 20 from the front front side of the vehicle body, as shown in FIGS. The front hood 20 is bent in a U-shape (bending height a) as a whole, at the low strength portions 24a, 24b, 24c. Such a bend absorbs the impact force, and the front hood 20
Is prevented from penetrating the windshield 28 and entering the vehicle interior.

[0006]

However, the direction of the impact force received by the front hood 20 is not limited to the direction from the front, but may be from an oblique direction (a direction inclined with respect to the longitudinal direction of the vehicle body) as shown in FIG. In many cases, impact forces are applied. Further, even when the front hood 20 receives an impact force from the front, the impact force may be applied to a location offset from the center line of the front hood 20. In such a case, there is a problem that the conventional hood structure as described above cannot effectively absorb shock. The problems are described below.

For example, as shown in FIG. 11, when an excessive impact force F is applied to the front hood 20 from diagonally left front, only a relatively small force acts on the right portion A of the front hood 20. Part A is hardly deformed. On the other hand, since an excessive impact force acts on the left portion B of the front hood 20, the low-strength portions 24a, 24b, and 24c provided on the left portion B are bent as shown in FIG.

The front hood 20 in a bent state
(Bending height b (see FIG. 12) is lower than bending height a (see FIG. 10) when the front hood 20 is bent by applying an impact force from the front to the rear. The phenomenon occurs because the right side portion A of the front hood 20 is hardly deformed as described above.

A dog leg type hinge member 2
When the front hood 20 is used to support the rotation of the front hood 20, the bent portion of the hinge member 25 may be deformed as the front hood 20 is bent. When the hinge member 25 is deformed as shown by a dashed line in FIG.
The length between the bending point P and the hinge shaft 27 is m before the bending deformation, but shrinks to n after the bending deformation (m> n). Accordingly, the bent height c of the front hood 20 becomes lower than the bent height b, as shown by a dashed line in FIG. 12, and the rear end 20a of the front hood 20 collides with and breaks through the windshield 28. However, there is a possibility that the rear end 20a may enter the vehicle interior.

Such a situation is caused by the fact that the dog leg type hinge member 25 tends to have insufficient rigidity due to its bent shape. Therefore, in order to avoid occurrence of such a situation, the dog leg type hinge member 25 may have the same rigidity as the straight type, but in order to do so, the hinge member 25 must be made large. Must be performed, resulting in a disadvantage that the weight increases.

The present invention has been made in view of such circumstances, and has as its object to effectively reduce the impact force even when an excessively large impact force is applied to the hood in a diagonal direction. An object of the present invention is to provide a hood structure of an automobile that can absorb and suppress deformation of a hinge member and a vehicle body, and can reliably prevent a situation where a hood enters a vehicle interior. .

[0012]

In order to achieve the above object, according to the present invention, an inner panel constituting an inner surface of an automobile hood has a substantially rectangular frame portion and a diagonal portion.
The protrusion is bent and the inner panel of the protrusion is formed.
A low-strength portion consisting of a bent portion or a hole is provided at an intermediate location in the front-rear direction of the loudspeaker and at an interval on a line substantially along the left-right direction. In a hood structure of an automobile configured to absorb the impact force by bending and deforming the hood at the low strength portion when a force is applied,
A side portion of the frame portion of the protrusion, a pair of the protrusion,
At the corners, and at the center of the hood,
And forming the first low-strength portions, respectively,
The rear side of the first low-strength portion in the side portion of the frame portion
And the first low-strength portion of the diagonal portion
The second low-strength portions are respectively located at the left and right side portions that are located on the rear side and separated from the center portion of the hood.
Formed at the center of the hood, the first
Do not provide a second low-strength part at a location behind the low-strength part
Like that .

[0013]

[Function] In addition to the low-strength part normally provided in the hood, there is another low-strength part at the left and right side parts behind this low-strength part, so that an excessive oblique impact force acts on the hood. Therefore, the hood is bent in a U-shape even in these low-strength portions, and as a result, the deformation force acting on the hinge member that rotatably supports the hood can be reduced. Therefore, there is no possibility that the hood will break through the windshield and enter the vehicle interior due to the deformation of the hinge member.

[0014]

1 to 6 show an embodiment of the present invention.
This will be described in detail with reference to FIG.

FIG. 1 shows a four-wheeled vehicle 1 having a hood structure according to the present invention. In FIG. 1, reference numeral 2 denotes a front hood that covers an upper part of an engine room, and 3 denotes a rear portion of the front hood 2. It is a windshield.

The front hood 2 is an outer panel 2
a and the inner panel 2b are joined to each other in a closed sectional shape, and as shown in FIG.
Has a bent portion 4 having a substantially rectangular frame portion 4a and a diagonal portion 4b. As in the conventional case, the projecting portion 4 has a frame portion 4a (frame portion)
The first low-strength portions 5a, 5b, and 5c made of semi-cylindrical concave bent beads are provided in the side portions of the front hood 4a ), the diagonal portions 4b, and the center of the front hood 2.
(See FIG. 2A) are provided at locations that are spaced apart on a line substantially along the left-right direction at an intermediate location α in the front-rear direction of the front hood 20.

Further, in this embodiment, in addition to the first low-strength portions 5a, 5b, 5c, a second low-strength portion 5a, 5b, 5c is provided.
The low strength portions (bent beads) 6a and 6b are provided as shown in FIG. More specifically, the inner panel 2b of the front hood 2 includes first low-strength portions 5a and 5b.
The low-strength portion 6a is located at a position further behind by a distance m ₁ (see FIG. 3), that is, at a position on the side of the windshield 3 and at left and right side portions away from the center position β of the front hood. Is formed in the rear end region of the side portion of the frame portion 4a of the projecting portion 4, and the low-strength portion 6
b is formed in the rear end region of the diagonal portion 4b of the protrusion 4. In this case, the second low strength portions 6a, 6b
As shown in FIG. 2, the first low-strength portions 5a, 5b, 5c are disposed substantially in a direction substantially parallel to the arrangement direction (the left-right direction of the front hood 2).

The second low-strength portion is not provided at the rear portion of the front hood 2 indicated by the reference symbol R in FIG. 2 at the left and right center, that is, at the rear portion of the first low-strength portion 5c.

Although only the left half of the inner panel 2b is shown in FIG. 2, the right half portion also has the same protrusions 4, 1st low-strength portions 5a, 5b, 5
c and the second low-strength portions 6a and 6b are provided symmetrically.

As shown in FIG. 3, the front hood 2 having the above-described structure has a dog-wreck-shaped hinge member 8 fastened and fixed to the rear edge 2c thereof with bolts 7, as shown in FIG. It is supported rotatably about a hinge shaft 9 attached to a nearby vehicle body portion. Thus, under the state where the front hood 2 is arranged at a position covering the engine room 10, the first low-strength portions 5a, 5
b, 5c are arranged on the lower surface side of the front hood 2, and the first low-strength portions 5a, 5a,
The distance between 5b, 5c and the second low-strength portions 6a, 6b is m _{1 as} described above, and the distance between the second low-strength portions 6a, 6b and the hinge shaft 9 is m ₂ , The first low-strength portion 5a,
The distance between 5b, 5c and the hinge axis 9 is m = m ₁ + m ₂
(See FIG. 3).

The function of the front hood 2 having such a hood structure will be described below. First, when an excessive impact force is applied to the front hood 2 from the front direction, the front hood 2 is formed in a V-shape at the first low-strength portions 5a, 5b, 5c as in the conventional case. Bent, front hood 2 windshield 3
Is prevented from occurring. At this time, since the low-strength portion is not provided at the center of the rear portion of the front hood 2 (the portion indicated by the symbol R in FIG. 2), the second low-strength portions at the left and right sides of the rear portion of the front hood 2 are provided. No bending occurs in the portions 6a and 6b. Therefore, the second low-strength portions 6a and 6b have no influence on the impact force acting from the front.

When an excessively large impact force is applied to the front hood 2 in an oblique direction, or an excessively large impact force from the front direction is applied to a portion (offset portion) of the front hood 2 which is deviated from the left and right central portions. In this case, the front hood 2 is differently deformed on the left and right. Here, FIG.
The case where an excessive impact force is applied to the front hood 2 from the diagonally left direction as shown in FIG. 6 will be described. In this case, first, as shown by the alternate long and short dash line in FIG. Then, the first low-strength portions 5a, 5a as shown by solid lines in FIG.
B and 5c are bent in a U-shape.

At this time, since the right side portion A of the front hood 2 is hardly deformed, the front hood 2 is bent only at the second low-strength portions 6a and 6b as shown by a dashed line in FIG. , Both the first and second low-strength portions 5a, 5b, 5c and 6a, 6b are bent as shown by the solid line. In this case, the height h ₁ from the hinge shaft 9 to the hood portion corresponding to the first low-strength portions 5a, 5b, 5c under the state shown by the dashed line in FIG. 6, or the state shown by the solid line in FIG. The bend height h ₂ (h ₁ <h ₂ ) under
The bending height is lower than the bending height when an excessive impact force acts on the front hood 2 in the front direction (see the bending height a in FIG. 10).

However, according to the front hood 2 of the present embodiment, bending occurs not only in the first low-strength portions 5a, 5b, 5c but also in the second low-strength portions 6a, 6b. M ₁ and m _{2 of} FIG.
(See FIG. 6) does not change even after deformation. That is, even after the front hood 2 is deformed, the distance m ₂ between the second low-strength portions 6a and 6b and the hinge shaft 9 does not change, so that the acting force for deforming the hinge shaft 9 and thus the hinge member 8 is kept small. Will be done. Therefore, even at low height h ₂ bend, the second low-strength portion 6a, 6
The b bending of the deformation of the vehicle body portion of the mounting surface of the deformation and hinge member 8 of the hinge member 8 and prevents withdrawal from the body of the hinge member 8, the front hood 2 enters the vehicle interior breaks through the windshield 3 Can be prevented.

Further, as described above, since the acting force applied to the hinge member 8 can be suppressed to a small value, there is no problem even if the dog leg type hinge member 8 having relatively low strength is used, and a special case is obtained. No reinforcement is required. In addition, the second low-strength portions 6a and 6 are formed by bending a simple bead on the inner panel 2b of the front hood 2.
Because of the simple structure with the addition of b, there is no increase in cost.

As described above, one embodiment of the present invention has been described.
The present invention is not limited to this embodiment, and various modifications and changes can be made based on the technical idea of the present invention. Specifically, the first and second low-strength portions 5a, 5b,
The parts 5c, 6a and 6b do not necessarily have to be constituted by semi-cylindrical recesses as shown in FIG. 4 (a), but have a structure in which the strength is partially reduced, for example, as shown in FIG. 4 (b). It may be constituted by a hole (opening) 12 as shown.

[0027]

As described above, according to the present invention, the left and right sides of the inner panel of the hood which are located on the rear side of the conventionally provided low-strength portion and which are separated from the center of the hood. Since the low-strength part is further provided with a low-strength part different from the low-strength part, if an excessive impact force is applied to the hood from the front direction, the same shock absorption as before is performed. As a result, the hood can be effectively prevented from entering the vehicle interior.

According to the hood structure of the present invention,
When the hood is deformed, the hinge member that rotatably supports the hood and the structure that does not easily transmit an impact force to the vehicle body portion that is the mounting surface of the hinge member are hardly transmitted, so that the deformation of the hinge member and the vehicle body can be suppressed. Therefore, even when a dog-wreck type hinge member is used, it is not necessary to use a specially high-strength hinge member, and there is no problem even if a relatively low-strength hinge member is used. Further, in the hood structure according to the present invention, there is an advantage that the cost does not increase because a simple configuration in which another low-strength portion is simply added in addition to the low-strength portion normally provided conventionally is sufficient. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a four-wheeled vehicle equipped with a hood structure according to the present invention.

FIG. 2 is a plan view of the front hood as viewed from the direction of arrow M in FIG. 1, and is a plan view of a left half of an outer panel of the front hood cut away.

FIG. 3 is a sectional view taken along line NN in FIG. 1;

FIG. 4A is a perspective view of an inner panel portion of a front hood provided with a low-strength portion formed of a semi-cylindrical recess;
(B) is a modification of the low-strength portion, and is a perspective view of an inner panel portion of a front hood provided with a low-strength portion formed of a hole (opening).

FIG. 5 is a plan view showing deformation of the front hood when an excessive impact force in a diagonally left direction is applied to the front hood.

FIG. 6 is a cross-sectional view showing deformation of the front hood when an excessive leftward oblique impact force is applied to the front hood.

FIG. 7 is a plan view similar to FIG. 2, showing the structure of a conventional front hood.

FIG. 8 is a sectional view of a conventional front hood and windshield.

FIG. 9 is a plan view showing deformation of the front hood when an excessive impact force in the front direction is applied to the conventional front hood.

FIG. 10 is a cross-sectional view illustrating deformation of the front hood when an excessive impact force in the front direction is applied to the conventional front hood.

FIG. 11 is a plan view showing deformation of the front hood when an excessively large impact force in the left oblique direction is applied to the conventional front hood.

FIG. 12 is a cross-sectional view showing deformation of the front hood when an excessive leftward oblique impact force is applied to the conventional front hood.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Four-wheeled vehicle 2 Front hood 2b Inner panel 3 Windshield 5a, 5b, 5c First low-strength portion 6a, 6b Second low-strength portion 8 Hinge member 9 Hinge shaft 12 Hole (opening) α Intermediate point β Center Location

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/10

Claims (1)

(57) [Claims] 1. A projection having a substantially rectangular frame portion and a diagonal portion on an inner panel constituting an inner surface of a hood of an automobile.
Part is bent and formed at a middle part in the front-rear direction of the inner panel of the protruding part , and at a place spaced apart on a line substantially along the left-right direction, a low strength comprising a bent part or a hole part the section provided in an automobile hood structure that is configured to absorb the impact force by the hood to deform bent in the low-strength portion when an excessive impact force in a direction is applied before and after the hood, the protrusion Side portion of the frame portion,
At the corners, and at the center of the hood,
The first low-strength portions are formed respectively, and the first low-strength portions of the side portions of the frame portion are formed behind the first low-strength portions.
Side, and the first low strength of the diagonal portion
A portion of the rear side of the section, and the left and right side portions locations remote from the central portion of the hood, the second low-strength portion which
Each of the first low-strength portions is formed at a central portion of the hood.
Do not provide the second low-strength section at the more rear side
Automobile hood structure that was it, and said.