JP2008174061A - Vehicle body lower structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body lower structure capable of cutting back the number of parts and of reducing the moment applied to the ankles of an occupant on the driver's seat in the event of a crash. <P>SOLUTION: A toe board 14B is formed with wrinkle guide beads 40 along a slashing direction crossing the vehicle longitudinal direction, capable of absorbing the extension of the toe board 14B due to input load from the vehicle front side. In the event of a crash, this suppresses the extension of the general surface 114B of the toe board 14B, while wrinkles generated by the extension are formed along the wrinkle guide beads 40 in the slashing direction crossing the vehicle longitudinal direction to control the directions of the wrinkles. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle body lower structure in which a floor panel is connected to a lower side of a dash panel.

  In a vehicle, in order to reduce the moment applied to the ankle of a driver's seat occupant at the time of a collision, for example, a shock absorbing structure of a heel stopper may be applied (see, for example, Patent Document 1). In such a structure, a heel stopper member is assembled to the lower side of the dash panel, and the heel stopper member is deformed in the event of a vehicle collision to absorb the impact received by the foot of the foot pedaling the accelerator pedal.

However, in this conventional structure, a separate heel stopper member is assembled with a bolt or the like, which leads to an increase in the number of parts.
JP 2003-31540 A

  In view of the above facts, an object of the present invention is to provide a vehicle body lower structure capable of reducing the moment applied to the ankle of a driver's seat occupant during a collision while reducing the number of parts.

  The vehicle body lower part structure of the present invention described in claim 1 is a floor panel connected to a lower side of a dash panel separating an engine room and a cabin, at least one of a lower part of the dash panel and a front part of the floor panel. A bead that is formed along an oblique direction intersecting the vehicle front-rear direction and can absorb at least one of the lower part of the dash panel and the front part of the floor panel due to an input load from the front side of the vehicle. It is characterized by having.

  According to the vehicle body lower part structure of the present invention described in claim 1, at least one of the lower part of the dash panel and the front part of the floor panel is formed with a bead along an oblique direction intersecting the vehicle longitudinal direction, Since this bead can absorb the extension of at least one of the lower part of the dash panel and the front part of the floor panel due to the input load from the front side of the vehicle, the lower general surface of the dash panel and the floor can be The expansion of at least one of the front general surface of the panel is suppressed, and the direction of the ridge is controlled by forming the ridge generated by the extension in an oblique direction intersecting the vehicle longitudinal direction along the bead. .

  The vehicle body lower part structure according to a second aspect of the present invention is the structure according to the first aspect, wherein the dash panel is disposed behind the pair of left and right front side members extending substantially in the vehicle longitudinal direction on both sides of the front part of the vehicle body. A side member coupling portion to which an end side is coupled; and a placing portion on which a heel of an occupant's foot is placed on a lower side of an accelerator pedal, wherein the bead includes the side member joining portion and the placing portion. It is formed at a position in the vehicle width direction between the two and extends from the rear end portion on the vehicle rear side toward the front end portion on the vehicle front side so as to be positioned on the inner side in the vehicle width direction.

  According to the vehicle body lower part structure of the present invention described in claim 2, the bead is formed at a position in the vehicle width direction between the side member coupling portion and the mounting portion, and from the rear end portion on the vehicle rear side to the vehicle front side. Since it extends so as to be located on the inner side in the vehicle width direction toward the front end that becomes the side, if the side member coupling part is displaced rearward to the vehicle rear side compared to the center part in the vehicle width direction at the time of collision, the lower part of the dash panel And at least one stretch of the front of the floor panel is effectively absorbed by the bead.

  A vehicle body lower part structure according to a third aspect of the present invention is the structure according to the second aspect, wherein a reinforcing portion extending along the vehicle front-rear direction is provided between the bead and the mounting portion. And

  According to the vehicle body lower part structure of the present invention as set forth in claim 3, since the reinforcing portion extends along the vehicle front-rear direction between the bead and the mounting portion, the side member coupling portion is centered in the vehicle width direction at the time of collision. When rearward displacement is caused to the rear of the vehicle compared to the part, even if wrinkles occur due to the extension of at least one of the lower general surface of the dash panel and the front general surface of the floor panel, Progress is prevented or suppressed.

  As described above, according to the vehicle body lower structure according to claim 1 of the present invention, while absorbing the elongation at the time of collision by the bead and controlling the direction of the heel, while reducing the number of parts, It has an excellent effect that the moment applied to the ankle of the driver's seat occupant during a collision can be reduced.

  The vehicle body lower part structure according to claim 2 has an excellent effect that it is possible to effectively absorb the elongation of at least one of the lower part of the dash panel and the front part of the floor panel at the time of a collision.

  According to the lower body structure of the third aspect, the reinforcing portion has an excellent effect that the occurrence of wrinkles at the placing portion at the time of collision can be prevented or suppressed.

[First Embodiment]
A first embodiment of a lower body structure in the present invention will be described with reference to the drawings. In the figure, arrow UP indicates the upward direction of the vehicle, arrow FR indicates the forward direction of the vehicle, and arrow RH indicates the right side in the vehicle width direction. Also, these figures are shown with a left-hand drive vehicle.

  FIG. 1 is a perspective view of the overall configuration of the vehicle body lower part structure according to the present embodiment as viewed from the cabin 10 side (vehicle interior side). As shown in FIG. 1, a dash panel 14 is disposed in the front portion of the cabin 10. The dash panel 14 separates the engine room 12 and the cabin 10. The upper portion of the dash panel 14 is a vertical plate portion 14A formed in a substantially vertical plate shape, and the lower portion of the dash panel 14 is formed integrally with the vertical plate portion 14A and formed in an inclined plate shape. It becomes toe board 14B. The toe board 14B rises obliquely upward of the vehicle toward the front of the vehicle and is used for a passenger's foot. The floor panel 16 is connected to the lower end portion side of the toe board 14B, and the lower end portion of the toe board 14B is integrated with the front end portion of the floor panel 16 by being joined by spot welding or the like. In addition, a dash tunnel portion 14 </ b> C is provided at a substantially central portion in the vehicle width direction of the dash panel 14. A floor tunnel portion (not shown) of the floor panel 16 is connected to the rear end side of the dash tunnel portion 14C, and the rear end portion of the dash tunnel portion 14C is joined by spot welding or the like to form a tunnel shape. It is integrated with the front end of the floor tunnel. The floor tunnel portion (not shown) extends along the vehicle front-rear direction and reinforces the lower part of the body. In recent years, the rigidity of the dash tunnel portion 14C has been increased by the addition of tunnel reinforcement (not shown), and a large reaction force can be obtained at the dash tunnel portion 14C at the time of a vehicle collision.

  A pair of left and right front side members 18 extend substantially in the vehicle front-rear direction on both sides of the front part of the vehicle body, which is the engine room 12 side separated by the dash panel 14. The front side member 18 is formed in a long shape and has a rectangular closed cross section. The side member upper portion 18A is located on the front side of the vehicle from the vertical plate portion 14A of the dash panel 14 in a side view of the vehicle. A kick-up portion 18B that inclines from the rear end portion of the member upper portion 18A to the vehicle rear lower side along the side shape of the toe board 14B of the dash panel 14, and the rear end portion of the kick-up portion 18B along the lower surface of the floor panel 16 And a side member lower portion (not shown) extending to the vehicle rear side. Here, the both sides in the vehicle width direction on the outer surface side of the dash panel 14 are side member coupling portions 15A to which the rear end sides of the front side members 18 are coupled.

  The front end portions of the pair of left and right front side members 18 are connected to each other by a front bumper reinforcement (not shown) arranged with the vehicle width direction as a longitudinal direction. The front bumper reinforcement is a long, high-strength member that constitutes a part of the front bumper, and is disposed on the rear side of a front bumper cover (not shown) via an absorber.

  A rod support 24 for supporting the accelerator pedal 22 is fixed near the center in the vehicle width direction on the cabin 10 side of the vertical plate portion 14A in the dash panel 14. The accelerator pedal 22, which is a vehicle pedal, is attached to a pedal rod 22A formed by appropriately bending a rod-like member, and the tip of the pedal rod 22A, and is used to apply a pedaling force for a driver's seat occupant (driver). And a pedal pad 22B. In the driving state by the driver's seat occupant, the front portion of the right foot portion of the driver's seat occupant (a part of the portion directed toward the front side of the vehicle rather than the heel) is placed on the pedal pad 22B. The rod support 24 is provided with a rotation center shaft 26 whose axial direction is the vehicle width direction, and a pedal rod 22A of the accelerator pedal 22 is supported so as to be rotatable about the rotation center shaft 26. . The pedal rod 22A is disposed substantially along the vehicle vertical direction, and the pedal pad 22B is disposed on the toe board 14B side.

  A brake pedal 30 and a clutch pedal 34 are disposed on the left side of the accelerator pedal 22 in the vehicle width direction. The brake pedal 30 is disposed on the right side in the vehicle width direction (inward in the vehicle width direction) of the front side member 18 in the rear view of the vehicle, and is formed by bending a narrow plate material as appropriate, and the pedal arm 30A. And a pedal pad 30B to which the pedal force of the driver's seat occupant is applied. The clutch pedal 34 is disposed on the left side in the vehicle width direction (outside in the vehicle width direction) of the front side member 18 when viewed from the rear of the vehicle, and includes a pedal arm 34A and a pedal pad 34B.

  As shown in FIG. 3, on the toe board 14B as the lower part of the dash panel 14, the side member coupling part 15A and the heel 50A of the occupant foot part 50 are placed below the accelerator pedal 22 in the toe board 14B. Two saddle guide beads 40 as beads are formed at a position in the vehicle width direction between the saddle placement portion 15B (a saddle placement area indicated by hatching in FIG. 3). The heel guide bead 40 has a diamond shape in plan view. In this embodiment, the kite guide bead 40 is disposed on the vehicle lower side (substantially directly below) of the pedal pad 30B of the brake pedal 30, but is slightly wider than the position shown in FIG. You may arrange | position near the direction center.皺 Guide bead 40 is formed along an oblique direction intersecting with the vehicle longitudinal direction, and is located on the inner side in the vehicle width direction from rear end portion 40A on the vehicle rear side toward front end portion 40B on the vehicle front side. As shown in FIG. 2, a surplus portion is formed by projecting upward in the vehicle upward direction with respect to the general surface 114B of the toe board 14B. Thus, the heel guide bead 40 can absorb the elongation of the toe board 14B due to the input load from the front side of the vehicle by itself, and is used for measures against the toe board 14B (floor) elongation.

  As shown in FIG. 3, a wrinkle prevention bead 42 as a reinforcing portion extending in the vehicle front-rear direction is provided between the wrinkle guide bead 40 and the footrest portion 15 </ b> B serving as a foot area. The wrinkle prevention bead 42 has a rectangular shape in plan view and a convex shape on the upper side of the vehicle, and prevents the wrinkle from progressing from the side member coupling portion 15A side to the mounting portion 15B side in the toe board 14B. Functions as a prevention means.

  That is, the toe board 14B on which the heel guide bead 40 and the heel prevention bead 42 are formed has a structure in which the lower mounting portion 15B of the accelerator pedal 22 is not deformed or hardly deformed in a vehicle collision state (accelerator pedal bottom). Protection structure).

(Action / Effect)
Next, the operation and effect of the above embodiment will be described.

  When the collision body collides with the front bumper (not shown), the collision load at that time is input to the front side member 18 via the front bumper reinforcement (not shown). At this time, the front side member 18 shown in FIG. 3 transmits the load to the vehicle rear side while being axially compressed and deformed, as indicated by a two-dot chain line. A part of the transmitted load is supported by the dash tunnel portion 14C and the floor tunnel portion (not shown), and even if the side member coupling portion 15A moves backward to the vehicle rear side, the deformation of the dash tunnel portion 14C is suppressed. It is hardly retreated. In other words, due to the input load and a large reaction force such as the dash tunnel portion 14C, the toe board 14B has a space between the side member coupling portion 15A, the dash tunnel portion 14C, and the floor tunnel portion (not shown) substantially toward the vehicle rear side. Be pulled.

  Here, the toe board 14B is formed with a saddle guide bead 40 along an oblique direction intersecting with the longitudinal direction of the vehicle, and this saddle guide bead 40 absorbs the extension of the toe board 14B due to an input load from the front side of the vehicle. Therefore, at the time of a collision, the expansion of the general surface 114B of the toe board 14B is suppressed, and the wrinkles generated by the expansion of the general surface 114B of the toe board 14B are triggered by the 皺 guide bead 40 along the 皺 guide bead 40. It is formed in an oblique direction intersecting with the front-rear direction (control of wrinkles).

  More specifically, the eaves guide bead 40 is formed at a position in the vehicle width direction between the side member coupling portion 15A and the eaves portion 15B, and from the rear end portion 40A on the vehicle rear side to the front end on the vehicle front side. Since it extends so as to be located on the inner side in the vehicle width direction toward the portion 40B, when the side member coupling portion 15A is displaced rearward to the vehicle rear side compared to the dash tunnel portion 14C at the time of collision, the extension of the toe board 14B The bead 40 is effectively absorbed and the direction of wrinkles is controlled.

  That is, as shown in FIG. 4, the guide guide bead 40 having a longitudinal dimension A before the collision is formed by protruding toward the vehicle upper side with respect to the general surface 114B (FIG. 4A). 4) at the time of collision, as shown in FIG. 4B, the longitudinal dimension becomes A + α by extending in the pulling direction (arrow X1 direction and arrow X2 direction), so that the wrinkles on the general surface 114B of the toe board 14B While suppressing the generation, the direction in which the wrinkle is generated is triggered by the disposition direction of the wrinkle guide bead 40, and the wrinkle direction is restricted in a direction in which wrinkles are not generated in the mounting portion 15B (see FIG. 3). Is made).

  Further, as shown in FIG. 3, since the wrinkle prevention bead 42 extends along the vehicle front-rear direction between the wrinkle guide bead 40 and the mounting portion 15B, the general surface 114B of the toe board 14B is extended by a stretch in the event of a collision. Even if wrinkles occur, the wrinkle prevention beads 42 effectively prevent or suppress the progress of wrinkles toward the mounting portion 15B.

  As described above, the heel guide bead 40 and the heel prevention bead 42 function as heel protection beads that control torsion of the entire toe board 14B. In other words, according to the vehicle body lower structure of the present embodiment, the coffin guide bead 40 effectively absorbs the elongation at the time of collision and controls the direction of the coffin while reducing the number of parts (adding an impact absorbing member) This avoids an increase in cost and weight due to, for example, and prevents or restrains deformation of the erection portion 15B itself at the time of collision, and can effectively reduce the moment applied to the ankle of the driver's seat occupant at the time of collision. In addition, the wrinkle prevention bead 42 effectively prevents or suppresses the generation of wrinkles at the mounting portion 15B at the time of collision.

[Second Embodiment]
Next, a second embodiment of the lower body structure will be described with reference to FIGS. Note that the second embodiment is characterized by the shape and number of the heel guide beads 44 as beads, and the other configurations are substantially the same as those of the first embodiment. The same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 5 and 6, three heel guide beads 44 are formed on the toe board 14 </ b> B. The eaves guide bead 44 protrudes in a convex shape toward the vehicle lower side with respect to the general surface 114B of the toe board 14B, and has a concave shape when viewed from the cabin 10 side. The kite guide bead 44 in the present embodiment is substantially the same in configuration as the kite guide bead 40 (see FIG. 1 and the like) in the first embodiment with respect to other points, and detailed description thereof is omitted, but FIG. Then, in the eaves guide bead 44, a rear end portion on the vehicle rear side is denoted by reference numeral 44A, and a front end portion on the vehicle front side is denoted by reference numeral 44B. The eaves guide bead 44 can absorb the elongation of the toe board 14B due to the input load from the front side of the vehicle. Even with such a configuration, the same operations and effects as the first embodiment can be obtained.

[Third Embodiment]
Next, a third embodiment of the lower body structure will be described with reference to FIG. The third embodiment is characterized by the shape of the heel guide bead 46 as a bead, and the other configurations are substantially the same as those in the first and second embodiments. The same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 7, the toe board 14B is formed with three quadrangle saddle guide beads 46 in plan view, and these saddle guide beads 46 are located on the vehicle upper side with respect to the general surface 114B of the toe board 14B. It protrudes in a convex shape. The cocoon guide bead 46 in the present embodiment has substantially the same configuration as that of the cocoon guide bead 40 (see FIG. 1 and the like) in the first embodiment with respect to other points. Then, in the eaves guide bead 46, a rear end portion on the vehicle rear side is denoted by reference numeral 46A, and a front end portion on the vehicle front side is denoted by reference numeral 46B. The eaves guide bead 46 can absorb the elongation of the toe board 14B due to the input load from the front side of the vehicle. Even with such a configuration, the same operations and effects as the first embodiment can be obtained.

  In this embodiment, the heel guide bead 46 protrudes in a convex shape toward the vehicle upper side with respect to the general surface 114B of the toe board 14B. You may protrude convexly on the vehicle lower side with respect to 114B.

[Fourth Embodiment]
Next, a fourth embodiment of the lower body structure will be described with reference to FIGS. In the fourth embodiment, instead of the wrinkle prevention bead 42 (see FIG. 1 and the like) in the first to third embodiments, a wrinkle prevention portion 48A as a reinforcing portion constituting a part of the reinforcement 48 is arranged. The other features are substantially the same as those of the first embodiment, and therefore substantially the same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 8, a reinforcement 48 is disposed on the right side in the vehicle width direction (near the vehicle width direction inside) of the heel guide bead 40. The reinforcement 48 protrudes in a convex shape toward the upper side of the vehicle and has a peripheral edge formed in a flange shape and joined to the toe board 14B by welding, and is formed in a substantially T shape in plan view when viewed from the right side in the vehicle width direction. Yes.

  The left portion of the reinforcement 48 in the vehicle width direction is a wrinkle prevention portion 48A extending along the vehicle front-rear direction between the wrinkle guide bead 40 and the mounting portion 15B. Further, the reinforcement 48 includes an extending portion 48B extending from the intermediate portion in the longitudinal direction of the wrinkle preventing portion 48A to the right side in the vehicle width direction. The extending portion 48B has a step shape in which the vehicle rear side is lowered by one step from the top portion 148B to the vehicle lower side, and functions as a saddle stopper. As shown in FIG. 9, the heel 50A of the occupant foot 50 is placed on the laying portion 15B via the carpet 52 and the extending portion 48B. Even with the configuration described above, the same operations and effects as those of the first embodiment can be obtained.

[Fifth Embodiment]
Next, a fifth embodiment of the lower body structure will be described with reference to FIG. In the fifth embodiment, in the toe board 14B, a range from the vehicle lower side of the pedal pad 22B of the accelerator pedal 22 to the vehicle lower side of the pedal pad 30B of the brake pedal 30 (in FIG. 10, the mounting portion 15B and the extended protection range 15C ) As a protection area, that is, an area where the occurrence of wrinkles is prevented or suppressed in the event of a vehicle collision, the wrinkle guide beads 40 and wrinkle prevention beads 42 are arranged. Since other configurations are substantially the same as those of the first embodiment, substantially the same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 10, the eaves guide bead 40 is on the vehicle width direction left side (vehicle width direction outside) of the pedal pad 30B of the brake pedal 30 and on the vehicle width direction of the side member coupling portion 15A. It is formed on the right side (in the vehicle width direction). The wrinkle prevention bead 42 is formed at a position close to the wrinkle guide bead 40. Even with such a configuration, the same operation and effect as in the first embodiment can be obtained, and the occurrence of wrinkles on the vehicle lower side of the pedal pad 30B of the brake pedal 30 at the time of a vehicle collision can be prevented or suppressed.

[Supplementary explanation of the embodiment]
In the above embodiment, the saddle guide beads 40, 44, 46 are formed on the toe board 14B. However, as a vehicle floor structure, the bead is an oblique direction intersecting the vehicle front-rear direction at the front portion of the floor panel. The bead which is formed along the line and can absorb the extension of the front portion of the floor panel due to the input load from the front side of the vehicle may be used.

  Further, in the above-described embodiment, the saddle guide beads 40, 44, 46 are formed at the vehicle width direction position between the side member coupling portion 15A and the placing portion 15B, and the rear end portion 40A on the rear side of the vehicle is used for the vehicle. For example, the bead is formed on the outer side in the vehicle width direction of the side member coupling portion and is located on the vehicle rear side. You may extend so that it may be located in the vehicle width direction outer side as it goes to the front-end part used as the vehicle front side from an edge part.

  Furthermore, in the above embodiment, the case where the lower body structure of the present invention is applied to a left-hand drive vehicle has been specifically described. However, the lower body structure of the present invention can be similarly applied to a right-hand drive vehicle. Moreover, in the said embodiment, although the vehicle provided with the clutch pedal 34 was mentioned as an example, the vehicle body lower part structure of this invention is applicable similarly to the vehicle which is not provided with a clutch pedal.

It is the perspective view which looked at the whole structure of the vehicle body lower part structure concerning the 1st Embodiment of this invention from the cabin side. It is an expanded sectional view along line 2-2 in FIG. 1 is a plan view showing an overall configuration of a vehicle body lower part structure according to a first embodiment of the present invention. It is a perspective view which shows the state before and behind the elongate guide bead in the 1st Embodiment of this invention extending. FIG. 4A shows a state before the heel guide bead is extended. FIG. 4B shows a state after the heel guide bead is extended. It is the perspective view which looked at the whole structure of the vehicle body lower part structure concerning the 2nd Embodiment of this invention from the cabin side. FIG. 6 is an enlarged cross-sectional view taken along line 6-6 of FIG. It is the perspective view which looked at the whole structure of the vehicle body lower part structure concerning the 3rd Embodiment of this invention from the cabin side. It is the perspective view which looked at the whole structure of the vehicle body lower part structure concerning the 4th Embodiment of this invention from the cabin side. FIG. 9 is an enlarged cross-sectional view corresponding to a cross section taken along line 9-9 in FIG. 8. It is a top view which shows the whole structure of the vehicle body lower part structure concerning the 5th Embodiment of this invention.

Explanation of symbols

10 cabin 12 engine room 14 dash panel 14B toe board (lower part of dash panel)
15A Side member connecting portion 15B Positioning portion 16 Floor panel 18 Front side member 22 Accelerator pedal 40 皺 Guide bead (bead)
40A rear end part 40B front end part 42 wrinkle prevention bead (reinforcement part)
44 皺 Guide Bead (Bead)
44A rear end 44B front end 46 皺 guide bead (bead)
46A rear end portion 46B front end portion 48A wrinkle prevention portion (reinforcement portion)
50 Crew foot 50A 足

Claims (3)

A floor panel connected to the lower side of the dash panel separating the engine room and the cabin;
At least one of the lower part of the dash panel and the front part of the floor panel is formed along an oblique direction intersecting the vehicle front-rear direction, and the lower part of the dash panel and the floor panel of the floor panel due to an input load from the front side of the vehicle A bead capable of absorbing at least one of the front stretches;
The vehicle body lower structure characterized by having. The dash panel includes a side member coupling portion where the rear end sides of a pair of left and right front side members extending substantially in the vehicle longitudinal direction are coupled to both sides of the vehicle body front portion, and an occupant foot portion positioned below the accelerator pedal And a storage unit on which the bag is placed,
The bead is formed at a position in the vehicle width direction between the side member coupling portion and the mounting portion, and inward in the vehicle width direction from the rear end portion on the vehicle rear side toward the front end portion on the vehicle front side. The vehicle body lower structure according to claim 1, wherein the vehicle body lower structure extends so as to be positioned.   The vehicle body lower part structure according to claim 2, wherein a reinforcing portion extending along a vehicle front-rear direction is provided between the bead and the mounting portion.

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