JP2005178422A - Hood structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hood structure for a vehicle capable of enhancing pedestrian protection performance by suppressing secondary collision G even when a gap between an inner panel of the hood and a content such as an engine cannot be sufficiently ensured. <P>SOLUTION: A general part 16 of the inner panel 14 of the hood 10 is constituted by mounting seating surfaces 18 arranged with a predetermined gap and fixed to an outer panel; and a connection part 20 of approximately right triangular pyramid shape for connecting the mounting seating surfaces 18. Therefore, primary collision load at collision is transmitted to the inner panel 14 through the mounting seating surface 18 positioned at a collision part and is dispersed and supported to a plurality of connection parts 20 arranged at a periphery of the mounting seating surface 18. Namely, the primary collision load can be widely and approximately equally received. As a result, the primary collision G can be enhanced and the second collision G occurred later can be suppressed. Accordingly, even when the gap between the inner panel 14 and the content such as the engine cannot be sufficiently ensured, the secondary collision G is suppressed and the pedestrian protection performance can be enhanced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle hood structure for reducing an impact load when a collision body collides with a hood.

  In general, an automobile hood is composed of an outer panel (outer plate) and an inner panel (inner plate). A conventional hood inner panel has a bone structure with X- and I-shaped bones set on the panel, a multi-corne structure with a number of multi-cornes, and a plurality of beams extending in the vehicle longitudinal direction in the vehicle width direction. Are classified into beam structures arranged at intervals of. From the viewpoint of pedestrian protection, a multi-corner structure and a beam structure are often adopted.

  Here, the following Patent Document 1 discloses a hood structure for a vehicle that belongs to a mulch cone structure. Briefly, in this vehicular hood structure, a large number of substantially conical convex portions (cones) are formed at predetermined intervals on the inner panel constituting the lower surface side of the hood. Each convex part has a shape in which the top part faces the outer panel side and the bottom part opens to the engine room side.

According to the above configuration, when the collision object collides with the outer panel of the hood, the primary peak G occurs when the collision object collides with the collision object, and then the secondary peak when the inner panel comes into contact with the contents such as the engine. G is generated. At this time, the convex portion of the contact portion is deformed, whereby energy is absorbed during the secondary collision, and the secondary peak G is lowered.
JP 2003-226264 A JP 2003-191865 A

  However, in the case of the above configuration, it is necessary to secure as wide a gap as possible between the convex portion (cone) of the inner panel and the contents such as the engine. Because it is important to suppress the secondary collision G from the viewpoint of protecting a collision body such as a pedestrian in general, if the gap between the convex portion and the contents such as the engine is narrow, Before the hood is sufficiently deformed, the colliding body has a secondary collision with the contents such as the engine, so that the secondary collision G becomes high. Therefore, in the case of the multi-tie cone structure, there is a problem that a sufficient gap must be ensured between the multi-cone of the inner panel and the contents such as the engine. Since the position (height) of the outer panel of the hood is determined in advance according to the vehicle type, the position of the hood cannot be increased to secure a gap.

  In consideration of the above fact, the present invention can suppress the secondary collision G and improve the pedestrian protection performance even when a sufficient gap between the inner panel of the hood and the contents such as the engine cannot be secured. The purpose is to obtain a food hood structure.

  The vehicle hood structure according to the first aspect of the present invention is a vehicle hood structure including an outer panel and an inner panel, and the general portion of the inner panel is continuously arranged at a predetermined interval. And a plurality of mounting seat surfaces that are each fixed to the back surface of the outer panel, and a plurality of connecting portions that are each formed in a substantially triangular pyramid shape and connect the mounting seat surfaces. It is characterized by.

  The vehicle hood structure according to a second aspect of the present invention is the vehicle hood structure according to the first aspect of the invention, wherein the plurality of mounting seating surfaces are arranged at a vertex and a center point when they are continuously arranged by combining different types of polygons. It is characterized by being set to.

  The effect | action of this invention of Claim 1 is as follows.

  When the colliding body collides with the hood, the colliding body first collides with the hood and deforms it, and a primary collision G occurs at that time. Subsequently, the colliding body collides with the contents such as the engine through the deformed hood, and a secondary collision G occurs at this time. Since the contents of the engine and the like are grasped as a rigid body that does not deform compared to the collision body or the hood, it is important how to lower the secondary collision G from the viewpoint of collision body protection.

  Here, in this invention, since the general part of the inner panel arrange | positioned at the back surface side of an outer panel is comprised as a continuous body of several mounting seat surfaces and several connection parts, the primary collision load input into the outer panel Is transmitted to the inner panel via the mounting seat surface located at the site where the load is input. In the inner panel, since the mounting seat surfaces are connected by a plurality of connecting portions each formed in a substantially triangular pyramid shape, the primary collision load transmitted to the mounting seat surface located at the collision portion of the inner panel is It is distributed and supported by a plurality of connecting portions arranged around the mounting seat surface. That is, according to the present invention, the primary collision load transmitted to the inner panel via the outer panel can be received uniformly over a wide range. As a result, according to the present invention, the primary collision G can be increased, and the secondary collision G that occurs thereafter can be suppressed. In other words, according to the present invention, by controlling the primary collision G and absorbing (condensed) the collision energy in a form close to a rectangular wave instead of a mountain wave, the energy balance at the time of the collision is shortened with a shorter stroke. Can be completed.

  According to the second aspect of the present invention, since a plurality of mounting seat surfaces are set at the apex and the center point when continuously arranging different types of polygons in combination, a specific mounting seat surface is selected. The connected line segment does not become a straight line in the vehicle width direction. In other words, when a plurality of mounting seats are set at the apex and center point of the same type of regular polygons, for example, when squares are continuously arranged, a number of straight lines are formed in the vehicle width direction. Therefore, there is a possibility that the position of the broken line when the hood is folded in a mountain shape along the vehicle width direction in order to reduce the load applied to the hood hinge at the time of a frontal collision may be indefinite. However, according to the present invention, no broken line is formed other than the intentionally created broken line.

  As described above, the vehicle hood structure according to the first aspect of the present invention has a plurality of attachments in which the general portion of the inner panel is continuously arranged at a predetermined interval and is fixed to the back surface of the outer panel. Since it is configured as a continuous body of the seating surface and a plurality of connecting portions that are formed in a substantially triangular pyramid shape and connect the mounting seating surfaces, it is possible to control the primary collision G to be increased with a shorter stroke. As a result, even when the gap between the inner panel of the hood and the contents such as the engine cannot be secured sufficiently, the secondary collision G can be suppressed and the pedestrian protection performance can be improved. Have.

  The vehicle hood structure according to the present embodiment described in claim 2 is the apex and center point when the plurality of mounting seat surfaces are continuously arranged by combining different types of polygons in the invention of claim 1. Therefore, the mounting seat surface is not aligned on the straight line along the vehicle width direction, and as a result, the reliability of folding the hood at the time of a frontal collision can be improved.

[First Embodiment]
Hereinafter, a first embodiment of a vehicle hood structure according to the present invention will be described with reference to FIGS.

  The state which looked at the whole structure of the food | hood from the back surface side is shown by the perspective view by FIG. FIG. 2 shows an enlarged plan view of a general part of the inner panel, and FIG. 3 shows a partial sectional view thereof. FIG. 4 is a perspective view showing a further enlarged view of the general part of the inner panel shown in FIG.

  As shown in these drawings, the hood 10 is constituted by an outer panel (outer plate) 12 (see FIG. 3) arranged outside the engine room and an inner panel (inner plate) 14 arranged inside the engine room. Has been.

  The inner panel 14 is configured as an aluminum alloy casting from the viewpoint of weight reduction. The general portion 16 of the inner panel 14 is configured as a continuous body of a plurality of mounting seat surfaces 18 that are continuously arranged at a predetermined interval and a plurality of connecting portions 20 that connect these mounting seat surfaces 18. . In addition, the general part 16 said here refers to the part inside the seal line of each peripheral part of the inner panel 14. For example, in the case of the rear end portion of the inner panel 14, the portion located in front of the seal line with the cowl disposed along the lower edge of the windshield glass, the front end portion, in the vicinity of the hood lock mounting portion 22. For the parts located on the rear side of the seal line with the radiator support upper set on the two sides, avoid the damper stay mounting part when a pair of left and right hood hinge mounting parts 24 and the damper stay are mounted and It is a part located inside the reinforcing member (bone) set in the front-rear direction along the hood side edge.

  The above-described elements will be specifically described. The mounting seat surface 18 is formed in a disk shape, and a mastic adhesive 26 is applied to this portion and fixed to the back surface of the outer panel 12. In the case of the present embodiment, as shown in FIG. 2, the plurality of mounting seat surfaces 18 are set to apexes and center points when regular hexagons are continuously arranged. Further, the connecting portion 20 is formed in a substantially triangular pyramid shape composed of three substantially triangular surfaces 20A, and when the hood 10 is assembled, the apex of the triangular pyramid faces downward (ie, the engine room side) (ie, the engine room side). , To be convex downward). The reason why the connecting portion 20 is configured in a substantially triangular pyramid shape is that the strength is high and a stable surface can be configured. In addition, the boundary part 28 (The part used as the base of three substantially triangular surfaces 20A which comprise the connection part 20) which connects the adjacent mounting seat surfaces 18 has comprised the straight shape. The boundary 28 itself is disposed close to the back surface of the outer panel 12, but is not bonded like the mounting seat surface 18.

  Next, the operation and effect of this embodiment will be described.

  When a colliding body such as a pedestrian collides with the hood 10, the colliding body first collides with the hood 10 and deforms it, and a primary collision G occurs at that time. Subsequently, the colliding body collides with the contents such as the engine through the deformed hood 10, and a secondary collision G occurs at this time. Since the contents of the engine and the like are grasped as a rigid body that does not deform as compared with the collision object or the hood, it is important how to lower the secondary collision G from the viewpoint of protecting the collision object such as a pedestrian.

  Here, in the present embodiment, since the general portion 16 of the inner panel 14 disposed on the back side of the outer panel 12 is configured as a continuous body of the plurality of mounting seat surfaces 18 and the plurality of connecting portions 20, the outer panel 12 The primary collision load input to the inner panel 14 is transmitted to the inner panel 14 via the mounting seat surface 18 located at the portion where the load is input. In the inner panel 14, the mounting seat surfaces 18 are connected to each other by a plurality of connecting portions 20 each having a substantially triangular pyramid shape, and therefore the primary transmitted to the mounting seat surface 18 located at the collision site of the inner panel 14. The collision load is dispersed and supported by a plurality of connecting portions 20 arranged around the mounting seat surface 18. That is, according to the present embodiment, the primary collision load transmitted to the inner panel 14 through the outer panel 12 can be received substantially uniformly over a wide range. Thereby, the primary collision G can be raised and the secondary collision G which arises after that can be suppressed. In other words, according to the present embodiment, by controlling the primary collision G and absorbing (condensing) the collision energy in a form close to a rectangular wave instead of a mountain wave, the energy balance at the time of the collision with a shorter stroke is obtained. Can be completed.

  As a result, according to the vehicle hood structure according to the present embodiment, the pedestrian can suppress the secondary collision G even when the gap between the inner panel 14 of the hood 10 and the contents such as the engine cannot be sufficiently secured. Protection performance can be improved. This also has the effect of suppressing the sight of the driver from being damaged by unnecessarily lifting the design surface of the hood in a vehicle equipped with a large engine.

  Further, as an effect related to the suppression of the secondary collision G, in the vehicle hood structure according to the present embodiment, the height h1 (see FIG. 3) of the substantially triangular pyramid-shaped connecting portion 20 is relatively low, 10 mm to 40 mm. When the secondary collision occurs with the contents such as the engine, the connecting portion 20 is easily crushed and absorbs energy at the time of the secondary collision, which contributes to the suppression of the secondary collision G. Incidentally, the distance h2 from the outer panel 12 to the mounting seat surface 18 is set to 2 mm to 4 mm.

  Furthermore, in the vehicle hood structure according to the present embodiment, the general portion 16 of the inner panel 14 is configured as a regular hexagonal aggregate, and the boundary portion 28 that connects the mounting seat surfaces 18 is located at a shallow position from the outer panel 12. Since it is set, a number of polygonal lines along the vehicle width direction are naturally formed. Therefore, it is possible to easily secure the hood folding function at the time of a frontal collision. For example, the XX line shown in FIG. 2 is an example. Such an XX line can be used as a broken line of the hood 10 at the time of a frontal collision. However, it is basically necessary to set one fold line (XX line) of the hood 10 at the time of a frontal collision in the vicinity of the middle part of the hood 10 in the front-rear direction so that the hood 10 can be surely broken. In order to prevent the hood 10 from being bent unintentionally at other fold lines (for example, the YY line in FIG. 2) along the vehicle width direction, the adjacent boundary portions 28 should not be aligned on a straight line. Etc. will be applied separately.

  Moreover, according to the vehicle hood structure according to the present embodiment, the inner panel 14 of the hood 10 is formed of an aluminum alloy casting, but if this is formed of a steel plate press-formed product, FIG. As added, a simple flat seating surface 30 can be set at the apex of an arbitrary connecting portion 20 without greatly deviating in the press direction. Thereby, the mounting seat surface and the mounting hole 32 of the hood silencer which are often set in a luxury car can be easily set.

  Furthermore, according to the vehicle hood structure according to the present embodiment, when the inner panel 14 of the hood 10 is formed of a press-formed product of a steel plate, the electric power is applied to the substantially triangular surface 20A of the joint portion 20 as added in FIG. The opening 34 that can be used for a coating adhesion hole, a weight reduction hole, a hood transporting locking hole, and the like can be formed simultaneously with molding. If the opening 34 is set so as not to cut the ridgeline of the substantially triangular surface 20A, the strength and rigidity are not lowered so much.

[Second Embodiment]
Next, a second embodiment of the vehicle hood structure according to the present invention will be described with reference to FIG. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  The top view which looked at the inner panel 42 of the food | hood 40 which concerns on 2nd Embodiment from the back surface side is shown by FIG. As shown in this figure, in this second embodiment, the general portion 44 of the inner panel 42 has a plurality of mounting seat surfaces 46 at the apex and center point when the pentagon and hexagon are continuously arranged in combination. It is characterized by the point set. More specifically, a regular pentagon 48 (indicated by a grid line) is disposed at substantially the center of the inner panel 42, and five hexagons 50 (indicated by diagonal lines) are disposed so as to surround this. . A mounting seat surface 46 is set at the apex and center of these regular pentagon 48 and hexagon 50. A regular pentagon 48 is again arranged around the hexagon 50 as appropriate.

  According to the said structure, the line segment which selected and tied the specific mounting seat surface 46 does not become a straight line in a vehicle width direction. In other words, when a plurality of mounting seats are set at the apex and center point of the same type of regular polygons, for example, when squares are continuously arranged, a number of straight lines are formed in the vehicle width direction. Therefore, there is a possibility that the position of the broken line when the hood is folded in a mountain shape along the vehicle width direction in order to reduce the load applied to the hood hinge at the time of a frontal collision may be indefinite. However, according to this embodiment, a broken line is not formed other than the intentionally created broken line. As a result, the reliability of folding the hood 40 during a frontal collision can be enhanced.

  In the first embodiment described above, the general portion 16 of the inner panel 14 is configured as a regular hexagonal assembly, and in the second embodiment, the general portion 44 of the inner panel 42 is configured as a regular pentagonal and hexagonal assembly. However, not limited to this, for the convenience of the design, or from the relationship between the method of selecting the mounting seat surface pitch and the thickness of the outer panel, and further from the boundary such as the peripheral edge of the general part, Polygons such as quadrangles, pentagons, heptagons, and octagons may be partially or entirely employed.

  Further, in each of the above-described embodiments, the mounting seat surfaces 18 and 46 have been described as being applied with a mastic adhesive. However, the present invention is not limited to this. The adhesive may be used.

FIG. 2 is a perspective view showing the overall configuration of the hood according to the first embodiment as viewed from the back side. FIG. 2 is an enlarged plan view of a general part of the inner panel shown in FIG. 1. FIG. 3 is a longitudinal sectional view taken along line 3-3 in FIG. 2. It is a perspective view which shows a mode that the general part of the inner panel shown by FIG. 2 was expanded further. It is a top view which shows the whole structure of the hood which concerns on 2nd Embodiment in the state seen from the back surface side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hood 12 Outer panel 14 Inner panel 16 General part 18 Mounting seat surface 20 Connecting part 40 Hood 42 Inner panel 44 General part 46 Mounting seat surface

Claims (2)

A vehicle hood structure including an outer panel and an inner panel,
The general portion of the inner panel is arranged continuously at a predetermined interval and is fixed to the back surface of the outer panel, and is formed in a substantially triangular pyramid shape and connects between the mounting seat surfaces. It is configured as a continuous body with a plurality of connecting portions,
A vehicle hood structure characterized by that. The plurality of mounting seat surfaces are set at the apex and the center point when continuously arranged by combining different types of polygons,
The vehicle hood structure according to claim 1.

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