JP2012106696A - Front hood for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front hood for a vehicle capable of preventing the generation of cracks on the seat face of a hood inner, and increased in the shape freezing property of a rear end side of the hood inner.SOLUTION: The front hood 110 for the vehicle includes a hood outer 120 configuring an outer face of the front hood; the hood inner 130 configuring an inner face of the front hood; the seat face 132 formed by raising the rear end side of the hood inner 130 toward the hood outer 120; a vertical wall 140 extended in the engine room direction from the seat face 132 continuously to the vehicle outer side of the raised seat face 132; one or more beads 142a-142d formed from the seat face 132 to the vertical wall part 140 so as to partially chamfer a corner of a boundary of the seat face 132 and vertical wall 140; and a reinforce 136 shaped roughly following the seat face 132 and welded to the seat face 132.

Description

  The present invention relates to a vehicle front hood.

  In vehicles such as automobiles, an engine room is provided at the front of the vehicle body. And a front hood is installed in the upper part of an engine room. Such a front hood is configured to be openable and closable around a rotation axis of a hood hinge connected to the rear end side portion.

  A hook-like striker is connected to the front center of the rear side of the front hood substantially at the center. The front hood is closed by fitting the striker to a hood latch connected to the front edge of the engine room (for example, a hood lock member). In general, the striker and the hood latch are fitted by dropping the front hood from about 10 cm above.

  Therefore, a considerable reaction force (impact) is applied to the seat surface of the front hood, in particular, the hood latch peripheral portion directly connected to the vehicle body and the hood hinge. Therefore, reinforcement may be reinforced by spot welding the seat surface of the hood inner to which the hood hinge is connected.

  Patent Document 1 describes a hinge mounting portion structure of an opening / closing body having a retainer (reinforce) at a mounting portion of a hood hinge. In particular, in the paragraphs 0030 to 0033 and FIGS. 5 to 7, as another example of the embodiment, a narrow band-like reinforcing portion (bead) that protrudes downward is surrounded by a hood so as to surround the retainer from four directions in plan view. The structure provided in the inner is described.

JP 2001-163259 A

  At the spot welding point where the hood inner and reinforcement are joined, a great stress concentration occurs. Conventionally, there has been a risk of cracking near the spot welding spot due to this stress concentration. Although the technique of Patent Document 1 may surely improve the strength to some extent, it is necessary to take a more thorough countermeasure against the problem of cracks.

  The present invention has been made in view of the above problems, and provides a vehicle front hood capable of preventing cracks in the seat surface of the hood inner and improving the shape freezing property of the rear end side portion of the hood inner. The purpose is to do.

  In order to solve the above-described problem, a typical configuration of the present invention is a vehicle front hood provided in an upper part of an engine room at the front of a vehicle body. A hood outer that forms the outer surface of the front hood and a hood that forms the inner surface of the front hood. An inner surface, a seat surface formed by raising the rear end side of the hood inner toward the hood outer side, a vertical wall portion extending continuously from the seat surface toward the engine room toward the outside of the raised seat surface, and a seat One or more beads formed so as to partially chamfer the corner of the boundary between the seat surface and the vertical wall portion from the surface to the vertical wall portion, and the shape substantially conforms to the seat surface and is welded to the seat surface. And a reinforcement.

  In such a configuration, a highly rigid bead extends obliquely from the seat surface to the vertical wall portion in the vehicle body width direction. Stress concentration occurs in the portion where the bead is formed due to the discontinuity of the shape. Since the stress applied to the rear end side portion of the hood inner is also applied to the beads and dispersed, individual stress concentration can be reduced. As a result, it is possible to prevent the seat surface of the hood inner to which the hood hinge is connected from cracking.

  Further, the bead extending obliquely from the seat surface to the vertical wall portion in the vehicle body width direction has an effect of improving the shape freezing property. That is, it also plays a role as a shape freeze bead. Therefore, it can prevent that a vertical wall part deform | transforms so that it may open to the vehicle outer side.

  It is preferable that the reinforcement is spot welded to the seating surface, and the bead is formed in the vicinity of the reinforcement and the spot welding hit point on the seating surface located in front. The stress analysis revealed that the stress concentration tends to increase with increasing the position of the spot welding points on the reinforcement and the bearing surface located forward. Thus, a more remarkable effect can be expected by providing a bead extending in the vehicle body width direction obliquely from the seat surface to the vertical wall portion in the vicinity thereof.

  ADVANTAGE OF THE INVENTION According to this invention, the front hood for vehicles which can prevent that a crack enters into the seat surface of a hood inner, and can aim at the improvement of the shape freezing property of a hood inner rear-end side part can be provided.

It is a figure which shows the motor vehicle to which the vehicle front hood concerning this embodiment was applied. It is a disassembled perspective view of the vehicle front hood shown in FIG. It is a principal part enlarged view of the food inner shown in FIG. It is each sectional drawing of FIG. It is a figure explaining the storage in the manufacturing field of the food inner shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram showing an automobile 100 to which a vehicle front hood (hereinafter simply referred to as “front hood 110”) according to the present embodiment is applied. FIG. 1A illustrates the time when the front hood 110 is opened, and FIG. 1B illustrates the time when the front hood 110 is closed. The arrow FR in the figure indicates the front of the vehicle body.

  As shown in FIGS. 1 (a) and 1 (b), a front hood 110 is installed on the upper part of the engine room 102 at the front of the vehicle body of the automobile 100. The front hood 110 is configured to be openable and closable around the rotation shaft 116 of the hood hinges 112 and 114 connected to the rear end side portion. A hook-like striker 118 is connected to the front center of the rear side of the front hood 110 substantially at the center.

  When closing the front hood 110, the striker 118 is usually fitted into a hood latch (not shown) by dropping from the upper side. Accordingly, a considerable reaction force (impact) is applied to the connecting portions of the hood hinges 112 and 114 (seat surfaces 132 and 134 of the hood inner 130 shown in FIG. 2) directly connected to the vehicle body.

  In view of this, the present embodiment proposes a structure that prevents damage (damage) due to a reaction force or the like when the front hood 110 is closed, is excellent in durability, and also takes safety into consideration. FIG. 2 is an exploded perspective view of the front hood 110 shown in FIG. FIG. 3 is an enlarged view of a main part of the hood inner 130 shown in FIG. 4 is a cross-sectional view of FIG. 3, FIG. 4 (a) is a cross-sectional view taken along line AA of FIG. 3, and FIG. 4 (b) is a cross-sectional view taken along line BB of FIG.

  As shown in FIG. 2, the front hood 110 includes a hood outer 120 that constitutes an outer surface thereof, and a hood inner 130 that constitutes an inner surface thereof. And it has the seat surfaces 132 and 134 formed by raising the rear end side part of the hood inner 130 to the hood outer 120 side.

  Hood hinges 112 and 114 are bolted to the seat surfaces 132 and 134 from below (on the engine room 102 side) (see FIG. 4A). On the opposite side of the seating surfaces 132 and 134, reinforcements 136 and 138 having a shape substantially conforming to the seating surfaces 132 and 134 are joined by spot welding.

  Hereinafter, the structure on the left side of the vehicle body will be described with reference to FIGS. 3, 4 </ b> A, and 4 </ b> B. The same description applies to the structure on the right side of the vehicle body.

  As shown in FIG. 3, in the present embodiment, the reinforcement 136 is joined to the seating surface 132 at spot welding points Z1 to Z4. A vertical wall portion 140 extending from the seat surface 132 toward the engine room 102 continues to the vehicle exterior side of the seat surface 132.

  One or more beads 142 a to 142 d are formed from the seat surface 132 to the vertical wall portion 140 so as to partially chamfer the corner portion of the boundary between the seat surface 132 and the vertical wall portion 140. These beads 142 a to 142 d are formed by bending a panel toward the engine room 102 from the seating surface 132 to the vertical wall portion 140. Here, four beads 142a to 142d are formed, but the number of beads 142a to 142d is not limited to this.

  In the above-described configuration, in order to ensure strength, an increase in the thickness of the hood inner 130 is avoided, and the seat surface 132 that is easily subjected to reaction force (impact) is locally reinforced by the reinforcement 136. That is, the thickness of the entire hood inner 130 may be about 0.5 mm, and no cost increase is required.

  The front hood 110 usually has a portion that allows deformation from the viewpoint of pedestrian protection. In the said structure, since the thickness of the food inner 130 whole is not increased, a pedestrian protection performance is not reduced. Therefore, the structure takes into consideration safety.

  Stress concentration occurs at spot welding points Z1 to Z4 of the reinforcement 136. However, in the above configuration, the highly rigid beads 142a to 142d extend obliquely from the seat surface 132 to the vertical wall portion 140 in the vehicle body width direction. As shown in FIG. 4B, the portion where the beads 142a to 142d are formed does not have a gentle R-shaped (rounded) bent cross section, and the seat surface 132 and the vertical wall portion 140 are connected to the beads 142a to 142d. 142d becomes a cross section connecting diagonally.

  Stress concentration occurs in the portion where the beads 142a to 142d are formed due to the discontinuity of the shape. Since the stress applied to the rear end side portion of the hood inner 130 is distributed to the spot welding hit points Z1 to Z4 and the beads 142a to 142d, individual stress concentration can be relaxed. Thus, it is possible to prevent the seat surface of the hood inner 130 to which the hood hinge 112 is connected from cracking. This prevents damage (damage) due to reaction force when the front hood 110 is closed, and has a structure with excellent durability.

  In addition, it is clear that the stress concentration tends to increase as the stress analysis is performed on the front of the plurality of spot welding points Z1 to Z4 of the reinforcement 136 and the seating surface 132, that is, the spot welding points Z1 and Z2. Became. Accordingly, by providing the beads 142a and 142b from the seat surface 132 to the vertical wall portion 140 in the vicinity of the spot welding hit points Z1 and Z2, a more remarkable effect can be expected.

  FIG. 5 is a diagram illustrating storage of the hood inner 130 shown in FIG. 2 at the manufacturing site. Fig.5 (a) is a schematic diagram at the time of storage of the food inner 130, FIG.5 (b) is an enlarged view of the side part of Fig.5 (a).

  As shown in FIG. 5 (a), the hood inner 130 manufactured at the manufacturing site is stacked and stored in the pallet 144 (loading platform) with the hood outer 120 side down from the viewpoint of securing space and improving workability. The At this time, the side portion of the lower hood inner 130 in the pallet 144 may be deformed so as to open outward due to the weight of the stack.

  FIG. 5B illustrates a state in which the side portion of the hood inner 130 is deformed so as to open outward by a two-dot chain line. Conventionally, in order to prevent such deformation, measures have been taken such as installing a spacer that fills the space between the side of the hood inner 130 and the pallet 144 or placing the hood inner 130 vertically.

  On the other hand, in the configuration described above, the bead 142a extending obliquely from the seat surface 132 to the vertical wall portion 140 in the vehicle body width direction has an effect of improving the shape freezing property. That is, it plays a role as a shape freeze bead. Therefore, it can prevent that the vertical wall part 140 (side part) deform | transforms so that it may open to the vehicle outer side. Therefore, there is no need to install a spacer that fills the space between the side of the hood inner 130 and the pallet 144 or to place the hood inner 130 vertically.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. According to the present invention, it is possible to realize the front hood 110 that can avoid cracks in the seating surface of the hood inner 130 to which the hood hinge 112 is coupled and can improve the shape freezing property of the side portion of the hood inner 130. The concept of the present invention can also be applied to other vehicle parts having portions corresponding to the seating surface 132 (top surface) and the vertical wall portion 140.

  It goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention can be used as a vehicle front hood.

Z1 to Z4 ... spot welding point, 100 ... automobile, 102 ... engine room, 110 ... front hood, 112, 114 ... hood hinge, 116 ... rotating shaft, 118 ... striker, 120 ... hood outer, 130 ... hood inner, 132, 134 ... Seat surface, 136, 138 ... Reinforce, 140 ... Vertical wall, 142a-142d ... Bead, 144 ... Pallet

Claims (2)

In the vehicle front hood provided in the upper part of the engine room at the front of the vehicle body,
A hood outer constituting the outer surface of the front hood;
A hood inner constituting the inner surface of the front hood;
A seating surface formed by raising the rear end side of the hood inner to the hood outer side;
A vertical wall portion extending continuously from the seating surface to the engine room direction on the vehicle exterior side of the raised seating surface;
One or more beads formed so as to partially chamfer corners of the boundary between the seat surface and the vertical wall portion from the seat surface to the vertical wall portion;
A shape substantially conforming to the seating surface, and reinforcement welded to the seating surface,
A vehicle front hood characterized by comprising: The reinforcement is spot welded to the seating surface,
2. The vehicle front hood according to claim 1, wherein the bead is formed in the vicinity of one of the plurality of spot welding points on the reinforcement and the seating surface that is positioned forward. 3.

Images