JP4967828B2 - Car engine hood - Google Patents

Description

  The present invention relates to an automobile engine hood.

  Conventionally, from the viewpoint of protecting pedestrians, the engine hood of an automobile is bent and deformed even if the vehicle collides with a pedestrian and the head or shoulder of the pedestrian is struck from above on the engine hood. To reduce the impact (see, for example, Patent Document 1 below).

In Patent Document 1, the outer peripheral edge of a frame-shaped hood inner along the back surface of the outer peripheral part of the hood outer that forms the outer plate is connected in series, and is installed between the inner peripheral edge and the outer frame part of the outer frame part of the hood inner. The intermediate frame portion is formed with a height lower than the back surface of the hood outer so as to be separated from the back surface of the hood outer, and the tongue piece that stands upward on the inner peripheral edge of the outer frame portion of the hood inner and the side edge of the middle frame portion. A plurality of flanges are provided at intervals, and the upper ends of the plurality of flanges are coupled to the back surface of the hood outer.
According to this, the flange is deformed by the impact load acting from above, and the hood outer is bent downward, so that the impact is alleviated.

By the way, the engine hood is generally provided with a hood lock striker 3 (FIG. 4) for locking the engine hood to the vehicle body side on the back side in the width direction center of the front end, and at least the center in the width direction of the front end of the engine hood. Then, the front end of the hood outer and the front end of the hood inner have a closed cross-sectional structure and the rigidity around the striker is reinforced.
As shown in FIG. 4, the front end of the hood inner 2 is bent from the horizontal front half 21 and the rear edge thereof and rises obliquely upward and rearward with respect to the front end of the hood outer 1 that is inclined downward. 22, the front edge of the front half 21 is joined to the front edge of the hood outer 1 by hemming, and the rear edge of the rear half 22 is joined to the back surface of the hood outer 1 at the front and rear intermediate positions. A closed cross section is formed. The reinforcement 4 is installed in the closed section, and the upper end of the striker 3 that protrudes downward through the front half 21 of the hood inner 2 is supported by the reinforcement 4.
Japanese Patent No. 3804567

However, when a collision load (arrow G in FIG. 4) acts on the front end portion of the engine hood having a closed cross section between the hood outer 1 and the hood inner 2 from above, the hood outer 1 immediately becomes the rear half portion 22 of the front end portion of the hood inner 2. There is a problem that the amount of bending deformation of the hood outer 1 with respect to the impact load G is small and the shock absorbing performance is not good. This is especially true for models with short engine hoods, such as wagon cars.
Therefore, the present invention provides an automobile hood that can increase the amount of flexural deformation caused by a collision load that acts on the front end portion of the engine hood from above while ensuring the rigidity around the striker at the front end portion of the engine hood, thereby improving shock absorption performance. An object of the present invention is to provide an engine hood structure.

The present invention relates to an engine hood of an automobile provided with a hood outer and a frame-shaped hood inner along the outer peripheral back surface of the hood outer, the front end portion of the hood outer having a front-falling inclined surface, and the front edge of the hood outer. automobile rising trailing edge is bent from a substantially horizontal first half portion and the trailing edge is bonded to the closed cross section by the front end portion of the hood inner forming the cross-section substantially Gyakuku shaped by the latter half portion which binds to a rear surface of the hood outer and In the engine hood of
While forming a plurality of bent portions extending in the width direction in the rear half of the front end portion of the hood inner at an interval in the front and rear, the latter half is formed in a step shape,
A groove portion extending in the front-rear direction is formed in the intermediate portion in the width direction in the latter half portion (Claim 1).
The rear half of the front end of the hood inner is high because when the collision load is applied from above via the hood outer, the entire rear half moves downward by bending and deforming from a plurality of bent parts in the width direction and the groove parts in the front-rear direction. Shock absorbing performance can be demonstrated.

The first half of the front end of the hood inner is bent from the rear edge of the front half and extends upward more steeply than the hood outer, and the first step of the upper edge of the first step A horizontal portion extending substantially horizontally through the bent portion, and a second step in which the upper edge is coupled to the hood outer by extending more steeply than the hood outer through the second bent portion at the rear edge of the horizontal portion. It forms in step shape by a part (Claim 2).
In the rear half of the front end portion of the hood inner, the groove portion extending in the front-rear direction and opening downward is formed in the intermediate portion in the width direction.
In the rear half of the front end of the hood inner, the bending angle of the first and second bent portions is opened and deformed by a collision load from above, the groove portion is opened and deformed downward, and bent downward while extending in the front-rear and left-right directions. Deform.

  An embodiment in which the present invention is applied to an engine hood H of a wagon car or the like will be described with reference to FIGS. The engine hood H is long in the vehicle width direction and has a rectangular shape in which the central portion in the width direction is curved in a bow shape protruding slightly forward from the left and right side edge portions. , And a frame-shaped hood inner 2 along the back surface of the hood outer 1.

The hood inner 2 has a frame shape along the outer peripheral back surface of the hood outer 1. Inside the hood inner 2, middle frame members 2 d and 2 d that connect the front end portion 2 A and the rear end portion 2 C of the hood inner 2 are provided. The outer peripheral edge of the hood inner 2 is coupled to the outer peripheral edge of the hood outer 1 by hemming. The front and rear width of the front end 2A is formed wide and is set to about one third to one half of the front and rear length of the engine hood H.
The inner peripheral edges of the left and right side end portions 2B, 2B and the rear end portion 2C of the hood inner 2 and the middle frame members 2d, 2d are not directly coupled to the hood outer one and are spaced downward from the hood outer 1. Is located. Further, flange portions 5 that stand up in a tongue-like shape with a predetermined interval are erected on the inner peripheral edges of the side end portions 2B and 2B and the rear end portion 2C and the middle frame members 2d and 2d. The upper end of 5 is bonded to the back surface of the hood outer 1 with a structural adhesive such as a mastic sealer. Each flange portion 5 is easily bent with respect to a load from above.

  At the front end portion of the engine hood H, the front end portion of the hood outer 1 and the front end portion 2A of the hood inner 2 form a closed cross-sectional structure. The front end 2A of the hood inner 2 is formed with respect to the front end of the hood outer 1 that is gently forwardly lowered, and the front half 21 that extends rearward from the front edge 20 that joins the front edge of the hood outer 1 and the rear edge. The second half portion 22 that is bent from the upper side and rises obliquely backward is formed in a substantially inverted cross section. In FIG. 2, reference numeral 6 denotes a molding member provided along the front end of the hood outer 1.

The rear half 22 of the front end 2A of the hood inner 2 is formed in a stepped shape, bent from the rear edge of the front half 21 and rises at a steeper angle than the hood outer 1, and from the upper edge thereof. A horizontal portion 25 that is bent (first bent portion 24) and forms a substantially horizontal plane toward the rear is provided, and further bent from the rear edge of the horizontal portion 25 (second bent portion 26) from the hood outer 1 The rear edge 28 is adhered to the back surface of the hood outer 1 with an adhesive.

  In addition, a groove portion 29 having a substantially U-shape in a shallow cross section is formed in the front end portion 2A of the hood inner 2 at the center in the width direction of the rear half portion 22 by bending the panel surface upward and opening the lower side. The groove portion 29 has a groove width set to about 20 to 30 mm and a depth set to about 5 mm.

  A reinforcement 4 that supports the lock striker 3 of the hood lock is installed in the center in the width direction within the closed cross section between the hood outer 1 and the front end 2A of the hood inner 2. The reinforcement 4 corresponds to the front end portion 2A of the hood inner 2 and has a horizontal front half portion 41 and a rear half portion 42 bent from the rear edge and rising upward and obliquely rearward. And the upper end of the lock striker 3 which protrudes in the substantially U shape below to the lower surface of the front half part 41 is couple | bonded.

In the reinforcement 4, the front half 41 of the reinforcement 4 is moved in a state where the lock striker 3 protrudes downward from a striker through-hole 211 formed in the center of the front half 21 of the front end 2 </ b> A of the hood inner 2. It is overlapped and coupled to the front half 21 of the front end 2A. A rear edge of the rear portion 42 of the reinforcement 4 is bonded to the back surface of the hood outer 1 with an adhesive.
Further, the rear half portion 42 is formed with a punch hole 43 that is an easily deformable portion at the upper and lower intermediate positions, and is easily deformed by a load from above.

According to this embodiment, when a pedestrian's head or shoulder collides with the front end of the engine hood H from above, the front half of the hood outer 1 bends downward due to the collision load G, and the front end 2A of the hood inner 2 It abuts on the rear half 22.
In this case, the rear end portion 22 of the front end portion 2A is a collision load G from the hood outer 1, the bending angle of the boundary with the front half portion 21 changes, and the first step portion 23 of the rear end portion 22 is deformed backward, The first bent portion 24 and the second bent portion 26 are opened and deformed so that the panel surface of the rear half portion 22 is bent and deformed downwardly so as to extend in the front-rear direction.
Further, the rear half 22 is bent and deformed downward in a curved manner so that the panel surface of the rear half 22 extends in the left-right width direction while the opening of the central groove 29 is opened and deformed by the collision load G. Therefore, the hood outer 1 is greatly bent and deformed without being restricted by the hood inner 2, and the deformation stroke of the hood outer 1 is increased, whereby the collision energy is absorbed and the impact on the pedestrian is alleviated.

In the above-described embodiment, the front end portion 2A of the hood inner 2 is applied to the engine hood H having a closed cross section with the front end portion of the hood outer 1 over the entire length in the width direction, but not limited thereto, the front end portion provided with the lock striker 3 is not limited thereto. You may apply to the engine hood which made the cross-sectional structure only the width direction center part. Further, the present invention is not limited to the engine hood of a wagon car having a short front and rear length, and may be applied to an engine hood of a normal passenger car.
Further, the rear half portion 22 of the front end portion 2A of the hood inner 2 may have a multi-step shape by providing three or more bent portions at the front and rear. The central groove portion 29 of the rear half 22 is not limited to the U-shape, and may have a V-shape or the like. Moreover, although it is good also as a shape which an upper side opens, it is desirable to make opening width larger than the groove | channel which the lower side opens.

It is a perspective view which shows the food inner of the engine hood of this invention. FIG. 2 is a longitudinal sectional view of a front end portion of an engine hood at a position along the line II-II in FIG. 1. FIG. 3 is a cross-sectional view of the front end portion of the engine hood at a position along the line III-III in FIG. 1. It is a longitudinal cross-sectional view of the conventional engine hood front end corresponding to FIG.

Explanation of symbols

H engine hood 1 hood outer 2 hood 2A the front end portion 21 front end rear half portion 23 first stepped portion 24 first bent portion 25 the horizontal portion 26 the second bending portion 27 the second step portion of the front half portion 22 front end of the 29 Groove

Claims (3)

An automotive engine hood having a hood outer and a frame-shaped hood inner along the outer peripheral back surface of the hood outer, the front end portion of the hood outer having a front-falling inclined surface, and the front edge joined to the front edge of the hood outer in automotive engine hood rising trailing edge is bent from a substantially horizontal first half portion and the trailing edge has a closed cross section by the front end portion of the hood inner forming the cross-section substantially Gyakuku shaped by the latter half portion which binds to a rear surface of the hood outer ,
While forming a plurality of bent portions extending in the width direction in the rear half of the front end portion of the hood inner at an interval in the front and rear, the latter half is formed in a step shape,
An automobile engine hood characterized in that a groove portion extending in the front-rear direction is formed in the middle portion in the width direction in the latter half portion.   The first half of the front end of the hood inner is bent from the rear edge of the front half and extends upward more steeply than the hood outer, and the first step of the upper edge of the first step A horizontal portion that extends substantially horizontally through the bent portion, and a second step in which the rear edge is coupled to the hood outer by extending more rapidly than the hood outer through the second bent portion at the rear edge of the horizontal portion. The engine hood for an automobile according to claim 1, wherein the engine hood is formed in a step shape by a portion. The engine hood for an automobile according to claim 1 or 2, wherein the groove portion that extends in the front-rear direction and opens downward is formed in the rear half portion of the front end portion of the hood inner .