JP4979496B2 - Vehicle engine hood - Google Patents

Description

  The present invention relates to an engine hood for a vehicle configured by joining a stiffener to an inner surface of a skin via a space.

  In the engine hood configured by joining the rim of the hood inner (stiffener) to the inner surface of the hood outer (skin), the following Patent Document 1 and Patent Document that improve the shock absorption performance when an object collides with the hood outer from above 2 is known.

  In Patent Document 1, two middle frame portions 31 and 32 having a difference in strength are provided in a hood inner so as to intersect each other in an X shape, and the two middle frame portions 31 and 32 are caused by impact of a collision. The shock absorbing performance is improved by deforming in a stepwise fashion.

In Patent Document 2, a hood inner fixed to a lower surface of a hood outer includes middle frame portions 31 and 31A having a hat-shaped cross section with an opened lower surface. , 31A to improve the shock absorption performance by deforming so as to open the opening on the lower surface.
JP 2004-322985 A Japanese Patent No. 3925452

  By the way, the inventions described in Patent Documents 1 and 2 have a limit in the amount of deformation of the middle frame portion due to the impact of a collision, so that it is difficult to secure a sufficient crash stroke, and sufficient impact absorption performance is obtained. There was no possibility.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to sufficiently secure a crash stroke and improve shock absorption performance when an object collides with an engine hood from above.

To achieve the above object, according to the first aspect of the present invention, in the engine hood of a vehicle constructed by joining a stiffener to the inner surface of the skin via a space, the stiffener skin is Hemming is performed so that the outer peripheral part of the stiffener is sandwiched between the outer peripheral part and the outer peripheral part of the stiffener connected to the front edge of the outer peripheral part of the skin. A front horizontal portion facing the lower surface of the skin with a gap, and a front inclined portion extending obliquely upward from the rear end of the front horizontal portion; A striker is provided that can removably engage with a hook and lock the engine hood in a closed position, and the outer frame portion on the rear side of the stiffener connected to the rear edge of the skin outer peripheral portion is a central portion in the vehicle width direction. smell A rear horizontal portion facing the lower surface of the skin at an interval, and a rear inclined portion extending obliquely upward from the front end of the rear horizontal portion, and the stiffener is arranged on the front side. The plurality of openings are arranged so as to be sandwiched between the outer frame portion and the rear outer frame portion and are parallel to each other at intervals in the vehicle width direction. Between the two openings, the stiffener in the vehicle width direction central portion extends in a belt shape in the longitudinal direction of the vehicle body with a predetermined gap between the lower surface of the skin and the rear end of the front inclined portion and the rear inclined part is one of the bridge portion that connects the front end of forming, curved portion which is curved so as to protrude in a U-shape on the engine room side is formed in the bridge portion, the first, second horizontal The vertical distance between the upper surface of the part and the lower surface of the skin is It is set longer than the vertical distance between the lower surface of the kin and the upper surface of the bridge part and shorter than the vertical distance between the lower surface of the skin and the bottom surface of the curved part, and the front inclined part is the rear inclined part An engine hood for a vehicle is proposed, which is longer and has a gentle slope .

  The second bridge portion 13d of the embodiment corresponds to the bridge portion of the present invention.

According to the configuration of claim 1, when an object collides with the upper surface of the engine hood of the vehicle configured by joining the outer frame portion of the stiffener through the space to the inner surface of the skin, the inner circumference of the outer frame portion of the stiffener The bridge portion that connects the vehicle body in the longitudinal direction of the vehicle body is pushed downward by the skin that deforms downward toward the engine room and deforms downward. At this time, if the bridge part is a flat belt-like member, there is a concern that the bridge part cannot move downward with the skin unless it is deformed and the crash stroke cannot be sufficiently secured. In the present invention, the bridge portion includes a curved portion that is curved in a U-shape, and only the bent portions at the two upper ends and the lower end of the curved portion are bent and deformed . It is possible to greatly deform downward without being obstructed, and to sufficiently secure a crash stroke downward of the engine hood, thereby improving the shock absorbing performance. In addition, since it is only necessary to form the curved portion in the bridge portion, the structure is extremely simple and can be realized at low cost.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 5 show an embodiment of the present invention. FIG. 1 is a bottom view of a hood hood of an automobile, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is 3-3 in FIG. 4 is an enlarged sectional view, FIG. 4 is a view taken in the direction of the arrow 4 in FIG. 3, and FIG.

As shown in FIGS. 1 and 2, a bonnet hood 11 that covers an automobile engine room in an openable and closable manner includes a skin 12 on the outer side of the vehicle body and a stiffener 13 fixed to the inside thereof. The skin 12 and the stiffener 13 are integrated with each other by interposing a sealer that functions as an adhesive between the two and the hemming process so that the outer frame portion 13F of the stiffener 13 is sandwiched. A plurality (four in the embodiment) of stiffeners 13 are arranged so as to be surrounded by the outer frame portion 13F (so that the front and rear outer frame portions 13Ff and 13Fr are sandwiched between the front and rear ). Openings 13a, 13a, 13b, and 13b are provided, and the peripheral portions of these openings 13a, 13a, 13b, and 13b are bonded to the lower surface of the skin 12 via a sealer.

  Two first bridge portions 13c, 13c extending in the longitudinal direction of the vehicle body are formed between the two openings 13a, 13a on the outer side in the vehicle width direction and the two openings 13b, 13b on the inner side in the vehicle width direction. A single second bridge portion 13d extending in the longitudinal direction of the vehicle body is formed between the two openings 13b, 13b on the inner side in the direction.

As shown in FIG. 2, the front outer frame portion 13Ff of the stiffener 13 connected to the front edge of the outer periphery of the skin 12 is a front horizontal portion 1s that is opposed to the lower surface of the skin 12 with a gap at the center in the vehicle width direction. And a front inclined portion 1k extending inclined rearwardly from the rear end of the front horizontal portion 1s. The front horizontal portion 1s has a U-shape for locking the hood hood 11 in the closed position. A striker 14 is provided, and the striker 14 can be engaged with and disengaged from a hook (not shown) provided on the vehicle body side. A pair of rubber cushion members 15 and 15 are provided on the left and right front edges of the outer frame portion 13Ff on the front side of the stiffener 13 so as not to directly collide with the vehicle body when the hood hood 1 is closed.

Further, as shown in FIG. 2, the rear outer frame portion 13Fr of the stiffener 13 connected to the rear edge of the outer periphery of the skin 12 is a rear side facing the lower surface of the skin 12 with a gap in the center in the vehicle width direction. It has a horizontal portion 2s and a rear inclined portion 2k that extends obliquely upward from the front end of the rear horizontal portion 2s.

As apparent from FIGS. 1 to 4, the second bridge portion 13 d of the stiffener 13 extends in a belt shape in the front-rear direction of the vehicle body with a predetermined interval between the lower surface of the skin 12 and the front side described above. The second bridge portion is integrally connected between the rear end of the outer frame portion 13Ff (particularly the front inclined portion 1k) and the front end of the rear outer frame portion 13Fr (particularly the rear inclined portion 2k). A curved portion 13e that protrudes downward in a U shape toward the inside of the engine room is formed at an intermediate position in the front-rear direction of 13d. Moreover, as shown in FIG. 2, the vertical interval between the upper surface of the first and second horizontal portions 1s, 2s and the lower surface of the skin 12 is between the lower surface of the skin 12 and the upper surface of the second bridge portion 13d. Is longer than the vertical distance between the lower surface of the skin 12 and the bottom surface of the curved portion 13e, and the front inclined portion 1k is longer than the rear inclined portion 2k and has a gentle gradient. Formed.

  Next, the operation of the embodiment having the above configuration will be described.

As shown in FIG. 5, when the object H repelled by the front bumper of the vehicle collides with the upper surface of the central portion of the hood hood 11, first, the skin 12 outside the hood hood 11 is deformed downward toward the engine room, The second bridge portion 13d pushed by the skin 12 is deformed downward. At this time, if the second bridge portion 13d is a flat band-shaped member, the second bridge portion 13d cannot move downward together with the skin 13 unless the second bridge portion 13d extends and deforms, and a sufficient crash stroke is ensured. There is a concern that can not.

  However, in the present embodiment, since the second bridge portion 13d includes a curved portion 13e that is curved in a U-shape, the bent portions at two places at the upper end and one place at the lower end of the curved portion 13e are provided. Only by bending deformation, the second bridge portion 13d can be greatly bent downward, and the downward deformation of the skin 13 is prevented from being hindered. As a result, when the object H collides, the skin of the bonnet hood 11 and the crash stroke downward of the second bridge portion 13d can be sufficiently secured, and the impact of the collision can be effectively absorbed. Moreover, since it is only necessary to form the curved portion 13e in the second bridge portion 13d, the structure is extremely simple and can be realized at low cost.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the curved portion 13e is provided only at the central second bridge portion 13d, but the curved portion 13 can also be provided at the left and right first bridge portions 13c and 13c.

Bottom view of car hood 2-2 sectional view of FIG. 3-3 enlarged sectional view of FIG. 4 direction arrow view of FIG. Action diagram at the time of collision

1k ・ ・ ・ ・ Front inclined part
1s ... Front horizontal part
2k ··· Rear slope
2s ... Rear horizontal part
11. Engine hood (bonnet hood)
12 ... Skin 13 ... Stiffener 13F ... Outer frame
13Ff ·· Front frame
13Fr ·· Rear outer frame
13a, 13b, 13b, 13a .. opening 13d... Second bridge part (bridge part)
13e ... curved portion
14 ... striker

Claims (1)

In the engine hood of a vehicle configured by joining the stiffener (13) to the inner surface of the skin (12) via a space,
The skin (12) is hemmed so that the outer periphery of the skin (12) is folded inward to sandwich the outer peripheral edge of the outer frame portion (13F) of the stiffener (13),
The outer frame portion (13Ff) on the front side of the stiffener (13) connected to the front edge of the outer periphery of the skin (12) is opposed to the lower surface of the skin (12) at the center in the vehicle width direction. A front horizontal portion (1s) and a front inclined portion (1k) extending obliquely rearwardly upward from the rear end of the front horizontal portion (1s). A striker (14) capable of detachably engaging the hook of the engine and locking the engine hood (11) in the closed position;
The outer frame portion (13Fr) on the rear side of the stiffener (13) connected to the rear edge of the outer periphery of the skin (12) is opposed to the lower surface of the skin (12) at the center in the vehicle width direction. A rear horizontal portion (2s) and a rear inclined portion (2k) extending obliquely upward from the front end of the rear horizontal portion (2s),
The stiffener (13) is arranged in such a manner that the front and rear outer frame portions (13Ff) and the rear outer frame portion (13Fr) are sandwiched between the front and rear sides, and a plurality of stiffeners (13) are arranged in parallel with each other at intervals in the vehicle width direction Of these openings (13a, 13b, 13b, 13a) and between the two openings (13b, 13b) on the center side in the vehicle width direction among the openings, the stiffener (13) has a central portion in the vehicle width direction. , Extending in a belt shape in the longitudinal direction of the vehicle body with a predetermined gap between the lower surface of the skin (12) and connecting the rear end of the front inclined portion (1k) and the front end of the rear inclined portion (2k) One bridge portion (13d) is formed,
The bridge portion (13d) is formed with a curved portion (13e) that curves so as to protrude in a U shape toward the engine room side .
The vertical distance between the upper surface of the first and second horizontal portions (1s, 2s) and the lower surface of the skin (12) is the vertical distance between the lower surface of the skin (12) and the upper surface of the bridge portion (13d). Longer than the direction interval and shorter than the vertical distance between the lower surface of the skin (12) and the bottom of the curved portion (13e),
The engine hood for a vehicle according to claim 1, wherein the front inclined portion (1k) is longer than the rear inclined portion (2k) and has a gentle gradient .

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