JP2008238919A - Vehicle hood structure - Google Patents

Abstract

A vehicle hood structure capable of preventing a rear end of the hood member from moving rearward and upward when a rearward load of a predetermined value or more is input from the front side of the hood member.
In a hood structure for a vehicle, an engine hood 12 having a rear end portion 12A fixed to a hinge arm 24 of a hood hinge 20 is in a posture to close an engine room 14, and a front end 12B is a hinge of the hood hinge 20. It is located below the vertical direction of the vehicle body relative to the shaft 26. The hinge arm on the front side of the fixed portion of the hinge arm 24 at the rear end 18A of the hood inner panel 18 constituting the engine hood 12 when a load greater than a predetermined value of the rear end 12A of the engine hood 12 acts backward. A rear fold promoting portion 28 is provided for deforming the hood inner panel 18 in a direction that facilitates the rotation of the hood 24 around the hinge shaft 26 in the vertical direction of the vehicle body.
[Selection] Figure 1

Description

  The present invention relates to a vehicle hood structure for supporting a hood member such as an engine hood.

A technique is known in which a weak portion is provided in an engine hood so that the engine hood is deformed so as to protrude upward in the vertical direction of the vehicle body in the event of a full vehicle collision (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-226629

  However, in the conventional technology as described above, the hood hinge is rotated in a direction in which the rear end of the engine hood is lifted obliquely rearward along with the deformation of the engine hood. Therefore, a special measure is taken to prevent this. It was necessary and the design constraints were great.

  In consideration of the above fact, the present invention can prevent the rear end of the hood member from moving rearward and upward when a rearward load of a predetermined value or more is input from the front side of the hood member. The purpose is to obtain a food hood structure.

  According to a first aspect of the present invention, there is provided a vehicle hood structure in which a support member fixed to a vehicle body and a rear end side in a vehicle body front-rear direction are rotatably supported around a hinge shaft along a vehicle width direction with respect to the support member. A rear end of the vehicle body in the longitudinal direction of the vehicle body can be opened and closed by pivoting an opening portion that opens upward in the vehicle body vertical direction at the front portion of the vehicle body about the hinge shaft. A hood member that is fixed to the front end side of the rotating member and that closes the opening and whose front end in the vehicle longitudinal direction is located below the hinge shaft in the vehicle vertical direction, and the vehicle body longitudinal direction of the hood member When the load more than a predetermined value is applied to the front end of the hood member in the front-rear direction of the vehicle body in the vehicle front-rear direction, the rotation member moves around the hinge shaft. Car body up and down direction And a, a weakened portion to deform the hood member in a direction to urge to rotate to the side.

  In the vehicle hood structure according to claim 1, the opening can be opened by rotating a hood member that closes the opening located at the front of the vehicle body around the hinge axis of the hinge. . When a load greater than or equal to a predetermined value is applied to the front end of the hood member in a posture in which the opening is closed, the rotating member is connected to the hinge shaft via the hood member whose front end is located below the hinge shaft. A moment is applied to rotate the surroundings downward. For this reason, the hood member is bent and deformed in a direction in which the fixed side of the rotating member with respect to the fragile portion is pulled downward to become a downward convex, and the above-described downward rotation of the rotating member is promoted. Thereby, the rear end of the hood member is moved so as to be pushed into the opening due to the load.

  Thus, in the vehicle hood structure according to claim 1, when a rearward load of a predetermined value or more is input from the front side of the hood member, the rear end of the hood member is prevented from moving rearward and upward. be able to.

  The vehicular hood structure according to a second aspect of the present invention is the vehicular hood structure according to the first aspect, further comprising another fragile portion provided on the front side in the vehicle front-rear direction of the fragile portion of the hood member. It was.

  In the hood structure for a vehicle according to claim 2, when a backward load of a predetermined value or more is applied to the front end of the hood member, the hood member also bends and deforms at other fragile portions. The amount is kept small.

  As described above, the vehicle hood structure according to the present invention prevents the rear end of the hood member from moving rearward and upward when a rearward load of a predetermined value or more is input from the front side of the hood member. It has an excellent effect of being able to.

  A vehicle hood structure 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the figure, the arrow FR indicates the front direction of the vehicle body, the arrow UP indicates the upward direction of the vehicle body, the arrow IN indicates the vehicle width direction inside, and the arrow OUT indicates the vehicle width direction outside.

  FIG. 1 shows a vehicle hood structure 10 in a side sectional view. As shown in this figure, the vehicle hood structure 10 includes an engine hood 12 as a hood member. The engine hood 12 is configured to be able to close an upper end opening portion 14A of the engine room 14 that is an upwardly opened space formed in front and lower of the windshield glass 13 in the vehicle body. In the engine room 14, for example, a prime mover such as an engine (not shown) is arranged.

  The engine hood 12 has a hood outer panel 16 and a hood inner panel 18 joined to each other at the peripheral edge by hemming so that the engine hood 12 is flat (see FIG. 1) in the vertical direction of the vehicle body and rectangular (not shown) in plan view. It is configured as a closed section structure. As shown in FIG. 1, the engine hood 12 is in a closed posture in which the upper end opening 14 </ b> A of the engine room 14 is closed, and the hood inner panel 18 is placed in the engine room 14 so that the hood outer panel 16 is substantially flush with the vehicle body surface. It is supposed to get in.

  The engine hood 12 described above is supported by the vehicle body S so that the above-described closing posture and an opening posture (not shown) for opening the upper end opening 14A of the engine room 14 can be taken by the hood hinge 20 as a hinge portion. Has been. Specifically, as shown in FIGS. 1 and 2, the hood hinge 20 has a support member in which a base portion 22A provided at the lower end is fixed to the vehicle body S (for example, the rear end of the apron upper member or the cowl top side). A hinge bracket 24 as a rotating member in which a hood fixing portion 24A provided at the front end in the longitudinal direction of the vehicle body is fixed to the rear end portion 12A of the engine hood 12, and a rear end portion of the hinge arm 24 A hinge shaft 26 that connects the upper end portion 24B of the hinge bracket 22 to the upper end portion 22B of the hinge bracket 22 so as to be rotatable around an axis along the vehicle width direction is a main portion.

  The hinge arm 24 is fixed to a rear end portion 18A of the hood inner panel 18 constituting the inner surface (lower surface) side of the engine room 14 in the engine hood 12 by means of fastening means such as bolts and nuts (not shown). The hinge brackets 22 are fixed to the vehicle body S by fastening means such as bolts and nuts (not shown).

  As a result, in the vehicle hood structure 10, the engine hood 12 is rotated upward about the hinge shaft 26 (in the direction of arrow A shown in FIG. 1) so that the engine hood 12 is opened at the upper end of the engine room 14. The engine hood 12 is returned to the closed posture by rotating the engine hood 12 in the open posture in the direction of arrow B which is opposite to the arrow A. ing.

  Supplementing the hood hinge 20 according to this embodiment, the hinge bracket 22 is configured so that a required shock absorbing stroke is ensured when a collision body collides from above in the vicinity of the rear end portion 12A of the engine hood 12. It is set high in the vertical direction. Further, in this embodiment, a predetermined amount of rotation in the arrow B direction of the hinge arm 24 from the closed posture of the engine hood 12 is allowed. In other words, the vehicle hood structure 10 is configured such that an obstacle that inhibits the rotation of the hinge arm 24 is not disposed on the arrow B side with respect to the hinge arm 24 in the closed posture of the engine hood 12.

  As a result, a downward shock absorption stroke in the vehicle body vertical direction at the rear end 12A of the engine hood 12 is ensured satisfactorily. Further, the hinge arm 24 is set to have a long front and rear (longitudinal) length, and a curved portion 24C serving as a rigidity reducing means is set at an intermediate portion in the longitudinal direction. Thereby, in the vehicle hood structure 10, the rigidity in the direction in which the hinge arm 24 is bent in the longitudinal direction is set to be relatively low, and the hood hinge 20 (hinge arm 24) is displaced downward from the rear end portion 12 </ b> A of the engine hood 12. It is said that it is hard to prevent.

  Further, in the vehicle hood structure 10, as shown in FIG. 1, the position of the front end 12 </ b> B of the engine hood 12 in the vertical direction of the vehicle body is disposed below the vertical position of the axis 26 </ b> A of the hinge shaft 26. ing. Thereby, in the vehicle hood structure 10, for example, when a rearward load F in the longitudinal direction of the vehicle body is input to the front end 12 </ b> B of the engine hood 12, the vehicle body between the axial center 26 </ b> A of the hinge shaft 26 and the front end 12 </ b> B of the engine hood 12. A distance M (see FIG. 3) that causes the engine hood 12 and the hinge arm 24 to rotate in the direction of arrow B with the vertical distance ΔH as the moment arm length is generated.

  In the vehicle hood structure 10, the engine hood 12 is provided with a rear fold promoting portion 28 as a fragile portion and a front fold promoting portion 30 as another fragile portion. In this embodiment, the rear fold promoting portion 28 is located immediately before the fixing portion of the hinge arm 24 on the rear end side of the hood inner panel 18 to which the hinge arm 24 of the hood hinge 20 is fixed (in the case of fastening, on the front side of the fastening point). If there is, it may be a contact range of the hood fixing portion 24A), and is formed continuously or intermittently in the vehicle width direction as a panel step portion in a sectional view. Accordingly, the hood inner panel 18 is configured to be easily bent and deformed at the rear fold promoting portion 28 when a bending moment around an axis along the vehicle width direction is applied.

  On the other hand, the front fold promoting portion 30 is a front portion 18B of the hood inner panel 18, more specifically, a recess or a bent portion between the front end 18C of the hood inner panel 18 and a substantially intermediate portion 18D in the front-rear direction. The protrusion is formed continuously or intermittently in the vehicle width direction. Accordingly, the hood inner panel 18 is configured to be easily bent and deformed at the rear fold promoting portion 28 and the front fold promoting portion 30 when a bending moment around an axis along the vehicle width direction is applied.

  Next, the operation of this embodiment will be described.

  In the vehicular hood structure 10 configured as described above, the engine hood 12 closes the engine room 14 in the closed position, and opens the engine room 14 in the open position rotated from the closed position in the direction of arrow A. When a collision body collides with the rear end portion 12A of the engine hood 12 from above, the distance between the engine hood 12 and the vehicle body S (fixed portion of the hinge bracket 22) is increased by the hinge bracket 22 that is configured to be high in the vertical direction of the vehicle body. Since it is ensured, the impact energy of the impacting body can be absorbed with a sufficient stroke, and the impact load (peak) acting on the impacting body can be reduced.

  By the way, in the vehicle hood structure 10, when the applied vehicle body S collides with the front, a rearward load F in the longitudinal direction of the vehicle body acts on the front end 12B of the engine hood 12 as shown in FIG. Since the front end 12B of the engine hood 12 is located below the hinge shaft 26 of the hood hinge 20 in the vertical direction of the vehicle body, as shown in FIG. A moment M in the direction of turning in the direction acts.

  Here, in the vehicle hood structure 10, since the rear fold promoting portion 28 is formed on the hood inner panel 18, as shown in FIG. 4, the rear end portion 18 </ b> A (from the rear fold promoting portion 28). (The rear part) follows the hood fixing part 24A of the hinge arm 24 by the moment M and is rotated in the direction of the arrow B, while the hood inner panel 18 protrudes toward the vehicle body side (lower side) at the rear folding promotion part 28. It is bent and deformed. In other words, the hood inner panel 18 is bent and deformed by the rear fold promoting portion 28, so that the hinge arm 24 is urged to rotate in the arrow B direction. As a result, as shown in the figure, the rear end 12A of the engine hood 12 is displaced downward so as to sink into the engine room 14, and is prevented from interfering with the windshield glass 13.

  Further, in the vehicle hood structure 10, since the front fold promoting portion 30 is formed on the hood inner panel 18, the hood inner panel 18 is also bent and deformed at the front portion 18B as shown in FIG. The force (collision load) that attempts to move 12 to the rear is absorbed, and the amount of rearward displacement of the engine hood 12 (particularly the rear end portion 12A) is kept small.

  As described above, in the vehicle hood structure 10 according to the embodiment of the present invention, when the rearward load F of a predetermined value or more is input from the front end 12B of the engine hood 12, the rear end portion 12A of the engine hood 12 is It is possible to effectively prevent the rearward movement.

  For example, in the hood hinge 100 shown as a comparative example in FIG. 5, a stopper 104 that can be engaged with the hinge bracket 102 is provided on the hinge arm 106, and the stopper 104 is engaged with the hinge arm 106, thereby The rearward upward movement is prevented. Even when the stopper 104 as described above is applied to the hinge arm 24 adopting a low rigidity structure (length, curved portion 24C) in the hood hinge 20, the rearward end portion 12A of the engine hood 12 is prevented from moving upward and backward. Although the effect is limited, in the vehicle hood structure 10 according to the embodiment of the present invention, the hinge arm 24 is rotated in the direction of the arrow B by the load accompanying the collision at the time of the frontal collision. The rear end 12A of the engine hood 12 can be displaced downward.

  That is, in the vehicle hood structure 10, the rear end portion 12 </ b> A of the engine hood 12 moves upward and rearward at the time of a frontal collision without being restricted by adopting the hood hinge 20 for securing the impact absorbing stroke of the collision body. This can be effectively prevented.

  In the above-described embodiment, an example in which the rear fold promoting portion 28 and the front fold promoting portion 30 are provided as the fragile portions has been shown. However, the present invention is not limited to this, and the vehicle hood structure 10 includes at least the rear portion. What is necessary is just to be provided with the folding promotion part 28. FIG. Further, the vehicular hood structure 10 may form a weak portion by, for example, a thin portion or a partial cutout portion instead of the rear fold promoting portion 28 and the front fold promoting portion 30 due to the bent shape of the panel.

  In the above-described embodiment, the example in which the engine hood 12 that opens and closes the engine room 14 is provided as the hood member has been described. The present invention may be applied to a configuration in which a prime mover such as is not disposed.

1 is a side sectional view showing an overall configuration of a vehicle hood structure according to an embodiment of the present invention. It is a perspective view of the hood hinge which comprises the hood structure for vehicles which concerns on embodiment of this invention. It is a sectional side view showing the state of the front collision initial stage of the hood structure for vehicles concerning the embodiment of the present invention. It is a sectional side view showing the state after front collision of the hood structure for vehicles concerning the embodiment of the present invention. It is a perspective view which shows the hood hinge which concerns on the comparative example with the hood hinge which comprises the hood structure for vehicles which concerns on embodiment of this invention.

Explanation of symbols

10 Vehicle Hood Structure 12 Engine Hood (hood member)
14 Engine room (opening)
20 Hood hinge (hinge part)
22 Hinge bracket (support member)
24 Hinge arm (rotating member)
26 Hinge shaft 28 Rear fold promoting part (fragile part)
30 Front Folding Promotion Department (other vulnerable parts)

Claims (2)

A hinge portion including a support member fixed to the vehicle body, and a pivot member whose rear end side in the vehicle body front-rear direction is rotatably supported around the hinge shaft along the vehicle width direction with respect to the support member;
The rear end side of the vehicle body front-rear direction is fixed to the front end side of the rotating member so that the opening that opens upward in the vehicle body vertical direction at the front portion of the vehicle body can be opened and closed by rotating around the hinge shaft, And a hood member whose front end in the vehicle front-rear direction is positioned below the hinge shaft in a posture to close the opening, below the hinge shaft;
When a load greater than or equal to a predetermined value is applied to the front end of the hood member in the longitudinal direction of the vehicle body provided on the front side of the fixed portion of the rotating member on the rear end side of the vehicle body in the longitudinal direction of the hood member. A fragile portion for deforming the hood member in a direction that encourages the moving member to rotate downward in the vehicle body vertical direction around the hinge shaft;
Vehicle hood structure with   The hood structure for a vehicle according to claim 1, further comprising another fragile portion provided on a front end side of the hood member in a longitudinal direction of the vehicle body.

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