JP5093094B2 - Connection structure between dash panel and tunnel - Google Patents

Description

  The present invention relates to a connecting portion structure between a dash panel and a tunnel portion applied to a connecting portion between a dash panel and a tunnel portion.

In the connection part structure of a dash panel and a tunnel part, the structure where the front-end part of the tunnel part was applied to the dash panel from the vehicle interior side, and was combined is known (for example, refer patent document 1). In such a structure, for example, a front end flange bent from the main body of the tunnel portion serves as a coupling site with the dash panel.
JP 2005-47462 A

  However, in such a structure, the load load near the joint portion between the dash panel and the tunnel portion is large at the time of a frontal collision (at the time of a frontal collision or an offset frontal collision). If the side portion on the front end side is destroyed, the dash panel retraction amount tends to increase, so there is room for improvement in this respect.

  In view of the above facts, an object of the present invention is to obtain a connecting portion structure of a dash panel and a tunnel portion that can suppress the retreat of the dash panel during a front collision.

  The connecting portion structure of the dash panel and the tunnel portion according to the first aspect of the present invention includes a pair of wall portions that partition the compartment and a space located on the vehicle body front side of the compartment and face each other in the thickness direction. Provided on the dash panel, the lower part of the dash panel in the vehicle width direction central portion side is configured to be bent toward the vehicle body rear side, and the front end portion is provided on the vehicle width direction central portion side of the dash panel. Disposed in the tunnel portion extending substantially along the longitudinal direction of the vehicle body, forming a side portion of the front end portion of the tunnel portion, and being inserted between the pair of wall portions in the lower portion of the dash center side A tunnel front end vertical wall portion coupled to the lower portion of the dash center side.

  According to the connecting portion structure of the dash panel and the tunnel portion of the present invention described in claim 1, the dash panel partitions the vehicle compartment and the space located on the vehicle body front side of the vehicle compartment and opposes the thickness direction. A pair of wall portions are provided, and a dash center side lower portion constituting a lower portion of the dash panel on the vehicle width direction center portion side is bent toward the vehicle body rear side. On the other hand, the tunnel portion has a front end portion that is disposed in the vehicle width direction center portion side of the dash panel and extends substantially along the vehicle body front-rear direction, and forms a side portion of the front end portion of the tunnel portion. The vertical wall portion is inserted between the pair of wall portions at the lower portion on the dash center side and is coupled to the lower portion on the dash center side. For this reason, a part of the load inputted to the dash panel from the front side of the vehicle body at the time of the front collision is stably supported as an axial load by the tunnel portion, and the dash panel is prevented from retreating.

  As described above, according to the connecting portion structure of the dash panel and the tunnel portion according to the first aspect of the present invention, there is an excellent effect that the dash panel can be prevented from retreating at the time of the front collision.

(Configuration of the embodiment)
A connecting portion structure between a dash panel and a tunnel portion according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In these drawings, an arrow FR appropriately shown indicates the vehicle body front side, an arrow UP indicates the vehicle body upper side, and an arrow IN indicates the vehicle body width direction inner side.

  FIG. 1 shows a horizontal cross-sectional view of the connecting portion 50 between the dash panel 30 and the tunnel portion 40 on the left side of the vehicle body (the left side of the vehicle) and the peripheral portion thereof. As shown in this figure, a front side member 12 extends along the longitudinal direction of the vehicle body at the vehicle body front portion 10. The front side member 12 is arranged in a pair on the left and right sides of the vehicle body front portion 10 and includes a front side member main body portion 14 and a front side member rear 16.

  The front side member main body 14 is made of an aluminum alloy casting (cast), has a closed cross-sectional structure with a rectangular cross section, and extends substantially along the longitudinal direction of the vehicle body. A front wheel (tire) 19 is disposed outside the front side member main body 14 in the vehicle width direction. Further, a front bumper reinforcement (not shown) is coupled to the front end side of the front side member main body 14, and this front bumper reinforcement constitutes a front bumper (not shown) so that the vehicle body width direction is the longitudinal direction. Is arranged as.

  A front end portion of the energy absorbing portion 16A in the front side member rear 16 is joined to the rear end portion of the front side member main body portion 14 by welding. The energy absorbing portion 16A is made of an extruded material of an aluminum alloy, and has a trapezoidal shape in which the outline shape in a plan view seen from the vehicle body vertical direction is widened from the front side member main body portion 14 side toward the vehicle body rear side. Has been.

  The energy absorbing portion 16A has a closed cross-sectional structure in which a plurality of vertical walls whose general surfaces are arranged with the plane including the vertical direction of the vehicle as a plane direction intersect, and these vertical walls are substantially triangular in plan view. A cell is formed. With such a structure, the energy absorbing portion 16A absorbs energy at the time of collision by compressing and deforming when a collision load F of a predetermined value or more is input from the front side member main body portion 14 side toward the vehicle body rear side. It is supposed to be.

  The rear end portion of the energy absorbing portion 16A is welded to the front side member bracket 16B. The front side member bracket 16B constitutes a part of the front side member rear 16 and is a pedestal portion of the energy absorbing portion 16A and is a cast product (casting) made of aluminum alloy. Parts on both sides in the vehicle body width direction of the front side member bracket 16B are fixed to the dash panel 30 by fasteners 18. In the cross section of FIG. 1, only the fastener 18 that fixes the outer side of the front side member bracket 16B in the vehicle width direction is shown.

  The dash panel 30 to which the front side member bracket 16B is fixed partitions the compartment 22 (cabin) and the engine compartment 20 as a space located on the vehicle body front side of the compartment 22. As shown in FIG. 2, which is a cross-sectional view taken along line 2-2 in FIGS. 1 and 1, the dash panel 30 has a general portion 30 </ b> A extending in the vehicle body width direction and the vehicle body vertical direction. The dash panel 30 has a substantially plate shape and is not shown in the figure. However, the dash panel 30 has an inverted U shape when viewed from the front of the vehicle body, that is, opens downward in the lower center of the vehicle body in the vehicle width direction. The cut-out portion 28 (see FIG. 1) cut into a substantially U-shape is formed. 1 is a part of the notch 28 and the side edge of the notch 28 on the left side of the vehicle body.

  The main part of the dash panel 30 is made of carbon fiber reinforced plastic (also referred to as “CFRP”, hereinafter abbreviated as “CFRP”). While CFRP is light and highly rigid, it has characteristics as a brittle material. As shown in FIGS. 1 and 2, the dash panel 30 made of CFRP includes a dash front panel 32 and a dash rear panel 34 as a pair of walls facing each other in the thickness direction. As shown in FIG. 2, the dash front panel 32 and the dash rear panel 34 constitute a closed cross section 36.

  In the closed cross section 36 of the dash panel 30, a plurality of internal skeleton members 38 are disposed. A plurality of (two in the present embodiment) internal skeleton members 38 are arranged at intervals in the vehicle body vertical direction with the vehicle body width direction as the longitudinal direction, and each has a rectangular frame-like closed cross-sectional structure. In this embodiment, the dash front panel 32, the dash rear panel 34, and the internal skeleton member 38 are each configured by CFRP. Further, in the dash panel 30, the closed cross section 36 and the internal skeleton member 38 are filled with foamed urethane foam U (foam core material) (sandwich structure).

  Near the lower end portion of the dash panel 30, a toe board 30 </ b> D for a passenger's foot is integrally provided. The toe board 30D is formed in an inclined plate shape inclined toward the rear side of the vehicle body toward the lower side of the vehicle body. In the present embodiment, the toe board 30D has a configuration in which the dash front panel 32 and the dash rear panel 34 are overlapped and joined, and the foamed urethane foam U ( It may be configured to be filled with a foam core material. A lower end portion of the toe board 30D is integrated with a front end portion of a floor panel (not shown). In the “integration”, in addition to the case where the toe board 30D and the floor panel are integrally formed, the toe board 30D and the floor panel are configured separately and are joined by spot welding or the like. Including cases.

  As shown in FIG. 1, the dash panel 30 includes an outer inclined wall portion 30 </ b> B whose outer end in the vehicle width direction is bent toward the rear of the vehicle and is inclined outward in the vehicle width direction toward the rear of the vehicle. A columnar A pillar 26 having a closed cross-sectional structure is fixed to the rear surface of the outer inclined wall portion 30B in the longitudinal direction of the vehicle body. In the present embodiment, the main part of the A pillar 26 is configured by CFRP.

  Further, the dash panel 30 has an inner inclined wall portion as a lower portion on the dash center side in which a lower portion on the vehicle body width direction center side (upper side in the figure) is bent toward the vehicle body rear side and is inclined toward the vehicle body rearward in the vehicle width direction. 30C is provided. A portion of the inner inclined wall portion 30C on the inner side in the vehicle width direction (a part of the dash front panel 32) constitutes a side edge portion on the left side of the vehicle body of the notch portion 28 described above.

  A front end portion 40 </ b> A of the tunnel portion 40 is disposed on the dash panel 30 on the center side in the vehicle width direction. The tunnel portion 40 extends substantially along the longitudinal direction of the vehicle body at the vehicle width direction center portion of a floor panel (not shown), and is formed in an inverted U shape by opening downward in the vehicle vertical direction when viewed from the front of the vehicle body. The front end side of the tunnel portion 40 in the vehicle longitudinal direction is continuous with the cutout portion 28. Although not shown, the downward opening end of the tunnel portion 40 in the vehicle body vertical direction is joined to the end of the left and right floor panels (not shown) on the center side in the vehicle width direction.

  In this embodiment, the main part of the tunnel part 40 is configured by CFRP. Similarly to the dash panel 30, the CFRP tunnel portion 40 includes a pair of vehicle interior side exterior tunnel panels 42 and vehicle interior side tunnel panels 44 that face each other in the thickness direction. The vehicle interior side tunnel panel 42 and the vehicle interior side tunnel panel 44 constitute a closed section 46.

  A plurality of internal skeleton members 48 are disposed in the closed cross-section portion 46 of the tunnel portion 40. A plurality of the internal skeleton members 48 are arranged along the longitudinal direction of the tunnel portion 40 with an interval in the vertical direction of the vehicle body, and each has a rectangular frame-like closed cross-sectional structure. In this embodiment, the vehicle interior side tunnel panel 42, the vehicle interior side tunnel panel 44, and the internal skeleton member 48 are each configured by CFRP. In the tunnel portion 40, the closed cross-section portion 46 and the internal skeleton member 48 are filled with foamed urethane foam U (foam core material) (sandwich structure). That is, the tunnel part 40 has a structure in which the proof stress is significantly improved as compared with the single-plate tunnel part, and has a structure that contributes to an improvement in the torsional rigidity of the vehicle body.

  In the tunnel portion 40 formed in an inverted U shape when viewed from the front of the vehicle body, the front end vertical wall portion 40B as the tunnel front end vertical wall portion constituting the side portion (side wall) of the front end portion 40A of the tunnel portion 40 is slightly bent. Inclined outward in the vehicle body width direction toward the front of the vehicle body. The front end vertical wall portion 40B is inserted between the pair of dash front panels 32 and the dash rear panel 34 in the inner inclined wall portion 30C of the dash panel 30. In the present embodiment, the offset amount in the vehicle body width direction between the front end vertical wall portion 40B of the tunnel portion 40 and the front side member main body portion 14 in the front view of the vehicle body is the vehicle body between the A pillar 26 and the front side member main body portion 14. It is smaller than the offset amount in the width direction.

  Here, the vehicle interior side tunnel panel 42 of the front end vertical wall portion 40B is bonded to the dash front panel 32 of the inner inclined wall portion 30C, and the vehicle interior side tunnel panel 44 of the front end vertical wall portion 40B is formed of the inner inclined wall. It is bonded to the dash rear panel 34 of the portion 30C. That is, the front end vertical wall portion 40B of the tunnel portion 40 and the inner inclined wall portion 30C of the dash panel 30 are bonded to each other at two locations on the vehicle interior 22 side and the vehicle exterior outside 24 side. The portion 40B is coupled to the inner inclined wall portion 30C of the dash panel 30.

  Further, a side skeleton member 52 is bonded to the outermost side in the vehicle body width direction by bonding or the like on the foremost end side in the vehicle interior side tunnel panel 44 of the front end vertical wall portion 40B. As shown in FIGS. 1 and 2, a plurality of (two in this embodiment) side skeleton members 52 are arranged at intervals in the vertical direction of the vehicle body (see FIG. 2), and the vehicle interior side tunnel panel 44 (see FIG. 2). 1) from the side to the outside in the vehicle body width direction, and each has a rectangular frame-like closed cross-sectional structure (see FIG. 2). In this embodiment, the side skeleton member 52 is made of CFRP, and the urethane foam U is filled in the side skeleton member 52 as well.

  The side skeleton member 52 is fitted in the end portion of the inner skeleton member 38 on the inner side in the vehicle width direction between the dash front panel 32 and the dash rear panel 34 in the general portion 30A of the dash panel 30. In other words, the inner skeleton member 38 and the side skeleton member 52 have a section that overlaps vertically in the vehicle body width direction (see FIG. 1), and are connected by a male-female fitting structure.

  As described above, the coupling portion 50 between the dash panel 30 and the tunnel portion 40 is set to have a high coupling rigidity by the above-described two-point bonding and fitting structure, and supports a load in the event of a vehicle collision or the like. It is also an effective structure.

(Operation and effect of the embodiment)
Next, the operation and effect of the above embodiment will be described.

  As shown in FIG. 1, in the connecting portion structure of the dash panel 30 and the tunnel portion 40 according to the present embodiment, the dash panel 30 partitions the vehicle compartment 22 and the engine room 20 and is paired with a pair of opposing in the thickness direction. A dash front panel 32 and a dash rear panel 34 are provided, and an inner inclined wall portion 30 </ b> C constituting the lower portion of the dash panel 30 at the center in the vehicle width direction is bent toward the vehicle rear side. On the other hand, the tunnel portion 40 has a front end portion 40A disposed on the vehicle width direction center portion side of the dash panel 30 and extends substantially along the vehicle body longitudinal direction, and the side portion of the front end portion 40A of the tunnel portion 40 is provided. Is inserted between the pair of dash front panels 32 and the dash rear panel 34 in the inner inclined wall portion 30C and is bonded to the inner inclined wall portion 30C by bonding. Therefore, the collision load F is transmitted from the front side of the vehicle body at the time of the front collision, and a part of the load input to the dash panel 30 from the front side member bracket 16B is stably supported as an axial load by the tunnel portion 40 ( The dash panel 30 including the toe board 30D (see FIG. 2) is prevented from moving backward.

  Supplementally, the load from the front side member main body portion 14 to the vehicle rear side at the time of the front collision is transmitted to the tunnel portion 40 side and the A pillar 26 side via the front side member rear 16 and the dash panel 30. Since the offset amount in the vehicle body width direction with respect to the member main body portion 14 is smaller on the front end vertical wall portion 40B side of the tunnel portion 40 than on the A pillar 26 side, the load is more easily transmitted to the tunnel portion 40 side than the A pillar 26 side. For this reason, a large load acts on the connecting portion 50 side between the dash panel 30 and the tunnel portion 40. Here, for example, in a contrasting structure in which the front end side of the tunnel portion is bent and coupled to the dash panel from the vehicle interior side, the load acts as a bending load on the coupling portion side of the dash panel and the tunnel portion. . On the other hand, in the present embodiment, the load is stably supported as an axial load by the tunnel portion 40. Therefore, the displacement of the dash panel 30 toward the passenger compartment 22 is effectively suppressed.

  As described above, according to the connecting portion structure of the dash panel 30 and the tunnel portion 40 according to the present embodiment, the dash panel 30 can be prevented from retreating at the time of a front collision.

It is a horizontal sectional view showing the connecting part structure of a dash panel and a tunnel part concerning one embodiment of the present invention, and its peripheral part structure, and shows only the left side of a body. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG.

Explanation of symbols

20 Engine room (space located on the front side of the vehicle body in the passenger compartment)
22 Car compartment 30 Dash panel 30C Inside inclined wall (lower part of dash center)
32 Dash front panel (wall)
34 Dash rear panel (wall)
40 tunnel part 40A front end part 40B front end vertical wall part (tunnel front end vertical wall part)
50 Connection between dash panel and tunnel

Claims (1)

The dash panel is provided on a dash panel having a pair of wall portions that partition the vehicle compartment and a space located on the vehicle body front side of the vehicle compartment and are opposed to each other in the thickness direction. And the lower part of the dash center side bent to the rear side of the car body,
A front end portion is disposed on the vehicle width direction center portion side of the dash panel, and is provided in a tunnel portion extending substantially along the vehicle body front-rear direction. A tunnel front end vertical wall portion inserted between the pair of wall portions in the lower side portion and coupled to the lower portion on the dash center side;
A connecting part structure of a dash panel having a tunnel and a tunnel part.

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