JP6671089B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a vehicle front structure including a connecting member that connects a frame member at a front end of a vehicle and a front bumper.

  A front bumper, which is an exterior member, is attached to a front end of the vehicle. For example, Patent Literature 1 discloses a configuration in which a front bumper is supported by a support (connecting member) provided on a bumper member that is a frame member at a front end of a vehicle.

JP-A-2006-94151

  In recent years, from the viewpoint of protection of pedestrians in the event of a frontal collision of a vehicle, in order to reduce the injury value to a collision target ahead of the vehicle, it is possible that each part of the vehicle deforms and absorbs the collision energy sufficiently. It has been demanded. In particular, the front bumper portion is a portion where the collision target first contacts, and the connecting member connecting the front bumper to the frame is smoothly deformed when a predetermined impact or more is applied to the front bumper. A structure that can sufficiently absorb collision energy is required.

  An object of the present invention is to provide a vehicle front structure including a connecting member that is easily deformed when a predetermined impact or more acts on a front bumper.

The vehicle front structure according to one embodiment of the present invention includes:
A vehicle front structure including a connecting member that connects a frame member at a front end of the vehicle and a front bumper,
The connecting member,
A first mounting piece fixed to the back surface of the front bumper,
An inclined piece that is connected to one end of the first mounting piece in the height direction of the vehicle, extends toward the rear side of the vehicle, and is inclined downward toward the rear side toward the rear side,
A second attachment piece connected to the rear end of the inclined piece and extending downward and fixed to the frame member,
The inclined piece extends in the width direction of the vehicle and includes a bent line portion that is more easily bent than other portions.

As one form of the vehicle front structure,
The inclined piece is formed at a central portion thereof, and has a concave portion that is recessed downward.
In the recess, a front edge and a rear edge of the vehicle may form the broken line portion.

  If the connecting member has a broken line portion, when a pedestrian collides with the front bumper and a stress is applied to the connecting member in the front-rear direction of the vehicle, the connecting member is easily bent from the broken line portion. Since the energy of the collision can be absorbed by the deformation of the connecting member, according to the vehicle front structure including the connecting member, it is possible to reduce the injury value to the collision target that has collided with the front bumper.

  By forming a concave portion in the inclined piece, it is possible to form a bent line portion separated in the front-rear direction of the vehicle, so that when a stress in the front-rear direction of the vehicle acts on the connecting member, the connecting member is viewed from the side of the vehicle. It is easy to bend in an approximate S shape. As described above, since the connecting member is largely bent in an S-shape, the collision energy can be further absorbed. In addition, there is an advantage that the concave portion can be easily formed by pressing or the like.

FIG. 2 is a schematic front front view of the vehicle with the front bumper shown in the first embodiment removed. FIG. 2 is a schematic view of a mounting structure of the front bumper shown in the first embodiment. FIG. 3 is a schematic perspective view of a connecting member provided in the mounting structure shown in FIG. 2. It is explanatory drawing explaining the mode of deformation | transformation of the connection member at the time of a collision.

  A vehicle front structure 1 according to an embodiment of the present invention will be described with reference to FIGS. The same reference numerals in the figures indicate the same names. "FR" indicated by an arrow in the figure is in front of the vehicle, "RR" is behind the vehicle, "UP" is above the vehicle, "LWR" is below the vehicle, "LH" is left of the vehicle, "RH". Indicates the right side of the vehicle. It should be noted that the present invention is not limited to these exemplifications, but is indicated by the claims, and is intended to include all modifications within the scope and meaning equivalent to the claims.

<First embodiment>
≪Overall configuration≫
FIG. 1 shows the vicinity of the front end of a monocoque body of a vehicle. The vehicle front structure 1 shown in FIG. 1 includes a frame member 2 for holding a radiator for cooling an engine, and an ODB (Offset Deformable Barrier) member 3 arranged further forward FR of the frame member 2. The frame-shaped member 2 is a member also called a radiator support, and is a rectangular frame-shaped metal member provided with an upper piece 2U, a lower piece 2D, a left piece 2L, and a right piece 2R as shown in FIG. The ODB member 3 is a metal member connected to an intermediate portion of the left piece 2L in the vehicle height direction and an intermediate portion of the right piece 2R in the vehicle height direction. In this example, a vertical piece 4 for connecting the frame member 2 and the ODB member 3 is further provided. The vertical piece 4 connects the middle part of the upper piece 2U in the vehicle width direction and the middle part of the ODB member 3 in the vehicle width direction. Note that a hood lock may be attached to the middle portion of the upper piece 2U in the vehicle width direction. One of the features of the vehicle front structure 1 of the present embodiment having the above configuration is a mounting structure of a front bumper to a frame member (ODB member 3 in this example) at the front end of the vehicle. Hereinafter, the details of the mounting structure will be described.

≪Mounting structure≫
FIG. 2 is a schematic view of the mounting structure of the front bumper 5, and FIG. 3 is a schematic perspective view of the connecting member 6 provided in the mounting structure as viewed obliquely from below the vehicle. A part shown by a two-dot chain line in FIG. 2 shows a part of the back surface of the front bumper 5. As shown in FIG. 2, in the vehicle front structure 1 according to the present embodiment, the ODB member 3 as a frame member and the front bumper 5 are separated from each other. Therefore, the vehicle front structure 1 of the present example includes a connecting member 6 that connects the ODB member 3 and the front bumper 5 that are separated from each other.

  As shown in FIGS. 2 and 3, the connecting member 6 is configured by bending a plate material, and includes a first mounting piece 61, a second mounting piece 62, and an inclined piece 63. The first attachment piece 61 is a portion fixed to the back surface (the surface on the rear RR side) of the front bumper 5. The first mounting piece 61 of this example is provided with a bolt hole 61h (FIG. 3), and the first mounting piece 61 is fixed to the front bumper 5 via a bolt 5b (FIG. 2) inserted into the bolt hole 61h. Have been.

  The second attachment piece 62 is a part fixed to the ODB member 3 as shown in FIG. More specifically, the second mounting piece 62 is sandwiched between the back surface of the ODB member 3 and the front surface of the vertical piece 4, and is fixed to the ODB member 3 by spot welding or the like (see a solid portion). As shown in FIG. 3, the second mounting piece 62 is provided with a bolt hole 62h, and the second mounting piece 62 is also connected to the vertical piece 4 via a bolt 4b (FIG. 2) inserted into the bolt hole 62h. Are linked.

  The inclined piece 63 is a portion connecting the first attachment piece 61 and the second attachment piece 62, and inclines to the lower LWR side toward the rear RR side when attached to the vehicle. The end of the inclined piece 63 on the front FR side is connected to the end of the first mounting piece 61 on the lower LWR side, and the end of the inclined piece 63 on the rear RR side is the end of the second mounting piece 62 on the upper UP side. Connected to the department. That is, the connecting member 6 is formed in a deformed S-shape that falls from the upper end of the first mounting piece 61 to the lower end of the second mounting piece 62 toward the lower LWR side. Here, the front FR side end of the inclined piece 63 may be connected to the upper UP side end of the first mounting piece 61. That is, the connecting member 6 may be formed in a modified “U” shape in which both the end of the first mounting piece 61 and the end of the second mounting piece 62 are arranged on the lower LWR side. Regardless of whether the connecting member 6 has a modified S-shape or a modified “U” shape, the inclined piece 63 is inclined with respect to the horizontal. Does not accumulate in the upper part of the connecting member 6. It is preferable that the inclination angle of the inclined piece 63 is not less than 10 ° and not more than 15 ° with respect to the horizontal.

  At the center of the upper surface of the inclined piece 63, a concave portion 69 that is concave toward the lower LWR side is formed. In FIG. 3 in which the connecting member 6 is viewed obliquely from below, a portion where the lower surface of the inclined piece 63 swells downward LWR is a concave portion 69. The opening on the upper UP side of the concave portion 69 of this example is substantially rectangular, and the front FR side edge, the rear RR side edge, the left LH side edge, and the right RH side edge of the opening portion. Does not extend to the edge of the inclined piece 63.

  As shown in FIGS. 2 and 3, the concave portion 69 is suddenly recessed from the front FR side edge portion toward the lower LWR side, gradually becomes shallower from the deepest portion, and the inclined piece 63 is positioned at the rear RR side edge portion. It is connected to the upper surface of. Both the front FR side edge and the rear RR side edge are bent line portions 64 and 65 that extend in the vehicle width direction and are more easily bent than other portions of the inclined piece 63 as shown in FIG. That is, each of the polygonal line portions 64 and 65 is a ridge line formed by connecting a surface having an angle to the upper surface of the inclined piece 63 to the upper surface. The inclination angle of the bottom surface of the concave portion 69 from the deepest portion of the concave portion 69 to the broken line portion 65 is smaller than the inclination angle of the upper surface of the inclined piece 63, but is inclined with respect to the horizontal plane, so that environmental water accumulates in the concave portion 69. There are few things. It is preferable that the inclination angle of the bottom surface of the concave portion 69 be inclined from 5 ° to 10 ° with respect to the horizontal plane.

  In addition, the connecting member 6 includes a flange portion 6F on a side edge thereof. The flange portion 6F is for ensuring the strength of the connecting member 6, and in this example, is formed by bending a side edge on the opposite side (upward UP side) from the concave portion 69. Of course, the flange portion 6F may be formed by bending a side edge on the same side as the concave portion 69. By providing the connecting member 6 with the flange portion 6F, it is possible to suppress the fatigue rupture due to insufficient rigidity of the connecting member 6.

  Also, the outside of the bend of the joint between the first attachment piece 61 and the inclined piece 63 (the lower LWR side) and the inside of the bend of the joint between the second attachment piece 62 and the inclined piece 63 (the lower LWR side). , A substantially triangular overlay 6P is formed. The build-up portion 6P is for ensuring the strength of the connecting member 6, and suppresses fatigue rupture due to insufficient rigidity of the connecting member 6. Further, the overlay portion 6P also has a function of suppressing the joint from bending before the broken line portions 64 and 65 in response to an input from the front FR.

≪Effect≫
According to the vehicle front structure 1 including the connecting member 6 described above, it is possible to reduce the injury value for the collision target that has collided with the front bumper 5. As shown in the upper diagram of FIG. 4, when stress is applied from the front FR side as shown by the outline arrow, as shown in the lower diagram of FIG. Is easy to bend in a substantially S-shape. When the connecting member 6 bends in a substantially S-shape, the energy of the collision is sufficiently absorbed, so that the injury value to the collision target is reduced.

  Further, the connecting member 6 of the present example has an advantage that it is easy to manufacture. The mounting pieces 61 and 62 and the inclined piece 63 can be formed only by pressing the plate material and bending the plate material. By the pressing, the flange 6F can be formed at the edge of the connecting member 6 in the vehicle width direction, and the recess 69 can be formed in the inclined piece 63. After the pressing, if the overlay 6P is formed by welding or the like, the connecting member 6 shown in FIG. 3 can be completed.

<Embodiment 2>
The broken line portion formed on the inclined piece 63 is not limited to the configuration of the first embodiment. For example, a broken line portion can be formed by a groove formed in the inclined piece 63. The groove may be formed to extend in the vehicle width direction. The groove may be provided on either the upper surface or the lower surface of the inclined piece 63, but it is preferable that both ends of the groove do not reach the end in the width direction of the inclined piece 63. If a plurality of grooves are formed, for example, a groove may be formed on the lower surface of the inclined piece 63 on the front FR side and on the upper surface of the inclined piece 63 on the rear RR side.

DESCRIPTION OF SYMBOLS 1 Vehicle front structure 2 Frame member 2D Lower piece 2L Left piece 2R Right piece 2U Upper piece 3 ODB member 4 Vertical piece 4b Bolt 5 Front bumper 5b Bolt 6 Connecting member 61 First mounting piece 62 Second mounting piece 63 Inclined piece 64, 65 broken line part 69 concave part 6F flange part 6P overlay part 61h, 62h bolt hole

Claims (1)

A vehicle front structure including a connecting member that connects a frame member at a front end of the vehicle and a front bumper,
The connecting member,
A first mounting piece fixed to the back surface of the front bumper,
An inclined piece that is connected to one end of the first mounting piece in the height direction of the vehicle, extends toward the rear side of the vehicle, and is inclined downward toward the rear side toward the rear side,
A second attachment piece connected to the rear end of the inclined piece and extending downward and fixed to the frame member,
The inclined piece,
A bent line portion that extends in the width direction of the vehicle and is easier to bend than other portions ,
A recess formed in a central portion and recessed to the lower side,
A vehicle front structure in which a front edge and a rear edge of the vehicle in the recess form the broken line portion .

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