JP2013124010A - Floor structure for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor structure for automobiles, which improves side collision performance without impairing vehicle body rigidity improvement being an original role of a cross member.SOLUTION: In such a welding part that a floor frame 16 and a front cross member 18 are made to cross each other, a second deformation allowance part Di, which is formed between a second welding portion Wi on the inside in the vehicle width direction and the opened end of a channel formation part 18A of the front cross member 18, is made larger than a first deformation allowance part Do which is formed between a first welding portion Wo on the outside in the vehicle width direction and the opened end of the channel formation part 18A.

Description

  The present invention relates to an automobile floor structure, and more particularly to an automobile floor structure including a joint between a cross member and a floor frame.

  As a floor structure of an automobile, a floor panel, left and right side shims joined to left and right edges of the floor panel and extending in the longitudinal direction of the vehicle body, and joined to the floor panel and inward of the vehicle body width direction from the side shim Left and right floor frames extending in the direction and joined to the floor panel, and cross members extending in the vehicle body width direction and joined to the upper surface of the floor panel and having end portions joined to the side shims. What has it is known (for example, patent document 1).

  In addition, as a cross member structure provided on the floor panel, a hat in which the cross member is on the inner side in the vehicle width direction and joined to the floor panel, and the end on the inner side in the vehicle width direction is back-labeled by the tunnel portion in the center of the vehicle width direction The left and right cross member bodies with a cross-sectional shape and the channel shape of the outer side in the vehicle body width direction joined to the left and right side shims (rockers) and inserted into the cross member main body and engaged in a tubular type (telescopic type) The left and right sub-cross members and the end portions on the outer side in the vehicle body width direction arranged in the respective sub cross members are joined to the left and right side shims, respectively, and the inner end portion in the vehicle body width direction is the end on the outer side in the vehicle body width direction There is known a structure divided into six parts with left and right channel-shaped core members facing each other with a gap in the part (for example, Patent Document 2).

  In this cross member structure, when a collision load is input to the cross member from the side shim due to a side collision, until the end of the core member hits the end of the cross member main body, that is, between the cross member main body and the core member. The vehicle body width direction stroke of the gap between them absorbs collision energy by easily deforming the side shim and the floor panel, and further prevents the center pillar joined to the side shim and the side shim from entering the inside of the vehicle .

JP 2009-6903 A JP-A-9-193837

  However, the cross member of the divided configuration increases the number of parts and the weight, and is not a structure in which the left and right side shims or the tunnel portion and the side shim at the center in the vehicle body width direction are continuously and firmly connected. It is difficult to improve the vehicle body rigidity, which is the original role, and it is difficult to achieve both the side collision performance and the vehicle body rigidity.

  The problem to be solved by the present invention is to improve the side collision performance without hindering the improvement of the vehicle body rigidity, which is the original role of the cross member.

  The floor structure of an automobile according to the present invention includes a floor panel (10), left and right side shims (14) joined to left and right edges of the floor panel (10) and extending in the longitudinal direction of the vehicle body, and the side shims (14). A channel shape (16A) that opens upward in the vehicle body width direction in the longitudinal direction of the vehicle body is formed, and a flange piece (16B) that extends from the opening end of the channel shape (16A) toward the left and right outer sides. And left and right floor frames (16) joined to the lower surface of the floor panel (10), and extended downward in the vehicle body width direction and opened downwardly joined to the side shims (14) at the left and right width direction ends. The floor panel is formed through a flange piece (18B) that has a channel shape (18A) and extends outward from the opening end of the channel shape (18A) in the vehicle longitudinal direction. 10) having a cross member (18) joined to the upper surface of the vehicle, wherein both flange pieces (18B) of the cross member (18) sandwich the floor panel (10). The two flanges of the cross member (18) are spot-welded to a flange piece (16Bo) on the outer side in the vehicle body width direction of the frame (16) at a first welding site (Wo) that is spaced from each other by a first distance (Lo). A second welded portion (Wi) in which a piece (18B) has a second distance (Li) between flange pieces (16Bi) on the inner side in the vehicle width direction of the floor frame (16) across the floor panel (10). ) And the second distance (Li) is larger than the first distance (Lo), so that the second welded portion (Wi) and the corresponding channel shape ( 8A) is formed between the open end of the first welded part (Wo) and the corresponding open end of the channel shape (18A). It is larger than the 1st deformation | transformation allowance part (Do) formed.

  According to this configuration, at the time of a side collision, the side shim (14) on the collision side of the cross member (18) is buckled and deformed by the deformation of the side shim (14) on the collision side inward in the vehicle width direction. The first welded part (Wo) of the first member is easily peeled off compared to the second welded part (Wi), and the cross member (18) and the floor frame (16) are separated from each other, and the side shim (14) on the collision side is separated. The side shim (14) side of the floor panel (10) between the floor frame (16) and the corresponding floor frame (16) is deformed. By these deformations, collision energy is effectively absorbed. The second welded part (Wi) on the collision side is prevented from having a large peeling force acting on the second welded part (Wi) by the deformation of the second deformation allowing portion (Di). No peeling occurs at the weld site (Wi). As a result, the cross member (18) and the front floor panel (10) on the inner side in the vehicle width direction from the second welded portion (Wi) are restrained from being deformed inward in the vehicle width direction. Entry into the vehicle width direction inside is restricted.

  In the automobile floor structure according to the present invention, preferably, the flange piece (18B) of the cross member (18) has a protruding piece (18D) extending locally outward, and the protruding piece (18D). Is provided with the second welded portion (Wi).

  According to this configuration, since the second welding site (Wi) that generates the large second deformation permissible portion (Di) is set to the projecting piece (18D), the second deformation permissible portion (Di) is obtained. In addition, it is not necessary to increase the flange width of the entire flange piece (18B), and there is no increase in the amount of material and weight that are wasted.

  The automobile floor structure according to the present invention preferably further comprises a bead (20) extending in the vehicle body width direction at a position where the cross member (18) of the floor frame (16) is arranged, more preferably an upper and lower multi-stage mountain shape. A cross-sectional bead (20) is formed.

  According to this configuration, the absorption of the collision energy due to the deformation of the front floor panel 10 between the side shim 14 on the collision side and the floor frame 16 is greatly performed with the deformation of the bead (20), and the side shim on the collision side ( Intrusion into the vehicle width direction inner side of 14) is effectively suppressed. This becomes more noticeable because the bead (20) has a multi-level cross-sectional shape of the upper and lower sides and the front floor panel (10) is more difficult to deform.

  The automobile floor structure according to the present invention preferably further includes the cross member (in the vehicle body width direction inner side than the welded portion between the cross member (18) and the floor frame (16) sandwiching the floor panel (10)). 18), a channel-shaped reinforcing member (22) is joined.

  According to this configuration, the center part in the vehicle body width direction of the cross member (18) is reinforced by the addition of the minimum reinforcing member (22), and this also causes the side shim (14) on the collision side to be inward in the vehicle width direction. It is effectively suppressed from entering.

  In the vehicle floor structure according to the present invention, preferably, the floor panel (10) is further provided with an electrodeposition paint groove (11) extending in the vehicle longitudinal direction at a position aligned with the floor frame (16) in the vehicle width direction. ), And the electrodeposition paint groove (11) is narrower in the vehicle width direction width of the portion (11A) where the floor frame (10) and the cross member (18) intersect than the other portion (11B), The flat surface around the second welded part (Wi) is enlarged.

  According to this configuration, the deformation around the second welded part (Wi) is suppressed, and the second welded part (Wi) becomes more difficult to peel off.

  According to the vehicle floor structure of the present invention, the interior space in the event of a side collision can be better secured without hindering the effect of improving the vehicle body rigidity by the cross member, and the canister disposed between the left and right floor frames. The damage prevention of the fuel system apparatus including the above is also performed well.

The perspective view which shows one Embodiment of the floor structure of a motor vehicle. The top view (top view) of the floor structure by this embodiment. The bottom view of the floor structure by this embodiment. The enlarged plan view which shows the detail of the welding part of the front cross member of a floor structure by this embodiment, and a floor frame. The line VV expanded sectional view of FIG. FIG. 3 is an enlarged sectional view taken along line VI-VI in FIG. 2.

  Hereinafter, one embodiment of a vehicle floor structure according to the present invention will be described with reference to FIGS. In the following description, the forward direction of the vehicle body is defined as the front, the left / right direction is determined based on this, and the upper vertical direction is defined as the upper direction. Each component of the vehicle body described below is formed by press-forming a steel plate including a high-tensile steel plate unless otherwise specified. Further, the components are joined by spot welding unless otherwise specified. A “hat-shaped cross-sectional shape” includes a channel-shaped portion (groove-shaped cross-sectional shape portion) and has a flange piece (welding allowance) extending outward from the open end (the tip of each side piece) of the channel-shaped portion. Shape.

  As shown in FIGS. 1 to 3, the automobile floor structure includes a substantially square front floor panel 10. A tunnel portion 12 that protrudes upward and extends in the front-rear direction of the vehicle body is formed at the center of the front floor panel 10 in the vehicle width direction (left-right direction). Left and right side shims 14 having a hat-shaped cross section extending in the longitudinal direction of the vehicle body are joined to the left and right edges of the front floor panel 10.

  Left and right floor frames 16 extending in the longitudinal direction of the vehicle body in parallel with the side shims 14 are provided on the inner side in the vehicle body width direction from the respective left and right side shims 14. The floor frame 16 has a substantially U-shaped cross-sectionally shaped channel shape portion 16A opened upward, and an opening end of the channel shape portion 16A, that is, from the front end of the side pieces on both sides of the channel shape portion 16A in the vehicle body width direction. It has a hat-shaped cross-sectional shape having a pair of flange pieces 16Bo and 16Bi extending toward the surface. The flange pieces 16Bo and 16Bi exist on the floor frame 16 on the outer side in the vehicle width direction and the inner side in the vehicle width direction with the channel shape portion 16A interposed therebetween, so the flange piece 16Bo is the outer flange piece 16Bo and the flange piece 16Bi is the inner flange. It may be called a piece 16Bi.

  In the floor frame 16, an outer flange piece 16Bo and an inner flange piece 16Bi are joined to the lower surface 10A of the front floor panel 10, respectively.

  On the upper side of the front floor panel 10, a front cross member 18 is provided that extends in the vehicle body width direction about a half of the side shim 14 in the vehicle longitudinal direction. The front cross member 18 includes a channel-shaped portion 18A having a substantially U-shaped cross-section opening downward, and an opening end a of the channel-shaped portion 18A (see FIG. 6), that is, both sides of the channel-shaped portion 18A in the vehicle longitudinal direction (front When viewed in the extending direction of the cross member 18 itself, it has a hat-shaped cross-sectional shape having a pair of flange pieces 18B extending from the front end of the side pieces on both the left and right sides toward the outside in the longitudinal direction of the vehicle body.

  The front cross member 18 has both front and rear flange pieces 18B joined to the upper surface 10B of the front floor panel 10 and an end in the left-right width direction (vehicle width direction) joined to the side shim 14. In this way, the front cross member 18 is made of a single steel material such as high-tensile steel, and extends on the front floor panel 10 continuously in a straight line in the vehicle body width direction so that the left and right side shims 14 are rigid. It is firmly connected. Thereby, the improvement of the vehicle body rigidity by the front cross member 18 is performed effectively.

  As shown in FIGS. 1, 2, and 5, each flange piece 18 </ b> B of the front cross member 18 crosses the outer flange piece 16 </ b> Bo and the inner flange piece 16 </ b> Bi of the floor frame 16 in the vehicle body width direction, that is, the flange. A portion where the piece 18B and the outer flange piece 16Bo overlap vertically with the front floor panel 10 interposed therebetween, and a portion where the flange piece 18B and the inner flange piece 16Bi overlap vertically with the front floor panel 10 (not shown in FIG. 4) interposed therebetween. Are respectively formed with tongue-shaped projections 18C and 18D that locally extend outward (in the longitudinal direction of the vehicle body). The projecting piece 18D corresponding to the inner flange piece 16Bi extends greatly in the longitudinal direction of the vehicle body as compared with the projecting piece 18C corresponding to the outer flange piece 16Bo.

  As shown in FIG. 4, the flange pieces 18B of the front cross member 18 have a first distance Lo between the outer flange pieces 16Bo of the floor frame 16 with the front floor panel 10 sandwiched up and down at the projecting pieces 18C. Spot welding is performed at the first welded portion Wo. Further, the two flange pieces 18B of the front cross member 18 have a second welded portion Wi that has a second distance Li between the inner flange piece 16Bi of the floor frame 16 with the front floor panel 10 sandwiched up and down in the projecting piece 18D. Spot welded. The second distance Li is greater than the first distance Lo in accordance with the protrusion 18D extending larger than the protrusion 18C. That is, the relationship is larger than Li> Lo.

  The flange piece 18B is a non-joint portion (a portion that overlaps without being welded) between the first welded portion Wo and the opening end a of the channel shape portion 18A, and the flange piece 18B is more than the outer flange piece 16Bo in the meantime. A first deformation allowing portion Do that can be relatively easily deformed in the direction of separation is formed. The flange piece 18B is also a non-joined portion (portion overlapped without being welded) between the second welded portion Wi and the opening end a of the channel shape portion 18A, and the flange piece 18B is also outside flange piece 16Bo. A second deformation allowing portion Di that can be relatively easily deformed in a further away direction is formed. As described above, since the second distance Li is larger than the first distance Lo, the size of the second deformation allowing portion Di in the longitudinal direction of the vehicle body is larger than that of the first deformation allowing portion Do. Note that the first deformation allowing portion Do can be set to substantially zero.

  Since the second welding portion Wi that generates the large second deformation allowance portion Di is set to the projecting piece 18D, the flange width (extension length) of the entire flange piece 18B is obtained in order to obtain the second deformation allowance portion Di. There is no need to increase the amount of material, and there is no need to increase the amount of material and weight.

  As shown in FIGS. 2 and 3, the bead 20 extending in the vehicle body width direction is pressed on both the left and right sides excluding the tunnel portion 12 at the position of the front cross member 18 of the front floor panel 10. Is formed. As shown in FIG. 6, the bead 20 has an upper and lower multi-level chevron cross-sectional shape.

  As shown in FIGS. 1 and 2, a channel shape is formed inside the front cross member 18 on the inner side in the vehicle body width direction from the second welded portion Wi which is a welded portion between the front cross member 18 and the floor frame 16. The reinforcing members 22 are joined.

  As shown in FIG. 5, an electrodeposition paint groove 11 extending in the longitudinal direction of the vehicle body is formed at a position where the front floor panel 10 is aligned with the floor frame 16 in the vehicle body width direction. In the electrodeposition coating groove 11, the width in the vehicle body width direction of the portion 11A where the floor frame 16 and the front cross member 18 intersect is narrower than the other portion 11B.

  A tunnel cross member 24 having a hat-shaped cross section extending in the vehicle body width direction is joined to the lower surface of the tunnel portion 12 of the front floor panel 10 as shown in FIG. Further, on both the left and right sides of the tunnel portion 12 of the front floor panel 10, as shown in FIGS. 1 and 3, the space between the front edge of the front floor panel 10 and the tunnel cross member 24 extends in the vehicle longitudinal direction. Left and right tunnel frames 26 having a hat-shaped cross-section joined to the lower surface of the front floor panel 10 are provided.

  As shown in FIG. 3, a rear cross member 28 that extends rearward of the vehicle body in the vehicle width direction from the front cross member 18 is provided below the front floor panel 10. The rear cross member 28 extends between the left and right floor frames 16 in the vehicle body width direction and is joined to the floor frame 16 and between the left and right side shims 14 and the left and right floor frames 16. The left and right side members 28B extending in the width direction and having end portions joined to the side shim 14 and the floor frame 16, each having a hat-shaped cross-sectional shape, are joined to the lower surface of the front floor panel 10. .

  According to the above-described configuration, it is formed between the second welded portion Wi where the flange piece 18B of the front cross member 18 and the inner flange piece 16Bi of the floor frame 16 are spot-welded and the opening end a of the channel shape portion 18A. The second deformation allowing portion Di is between the first welding site Wo where the flange piece 18B of the front cross member 18 and the outer flange piece 16Bo of the floor frame 16 are spot-welded and the open end a of the channel shape portion 18A. The flange piece 18B can be greatly deformed in the peeling direction in the second welded portion Wi compared to the first welded portion Wo, and the peeling energy is increased by the deformation. Since it is absorbed, it is difficult for the second welded portion Wi to peel off as compared with the first welded portion Wo.

  That is, when the side impact load is input to the front cross member 18 from the side shim 14, the anti-separation load of the second deformation allowance portion Di is (second deformation allowance portion Di) − (first deformation allowance portion Do). Is larger than the delamination load of the first welded portion Wo by an amount corresponding to. In other words, since the first deformation allowance portion Do is smaller than the second deformation allowance portion Di, the peel resistance load of the first welded portion Wo when the side impact load is input to the front cross member 18 from the side shim 14. Is smaller than the peeling resistance load of the second deformation allowance portion Di by an amount corresponding to (second deformation allowance portion Di)-(first deformation allowance portion Do).

  Thereby, at the time of a side collision, the side shim 14 on the collision side is deformed inward in the vehicle width direction, so that the side shim 14 side on the collision side of the front cross member 18 is buckled and deformed, and the first welding site Wo on the collision side is The front cross member 18 and the floor frame 16 are easily separated as compared with the second welded portion Wi, so that the front floor panel 10 and the corresponding floor frame between the side shim 14 and the floor frame 16 on the collision side are separated. The 16 side shim 14 side is deformed. By these deformations, collision energy is effectively absorbed.

  Since the front floor panel 10 between the side shim 14 and the floor frame 16 is formed with a bead 20 extending in the vehicle body width direction, a large load is applied to the deformation of this portion of the front floor panel 10 including the bead 20. Since it is necessary, the collision energy is greatly absorbed by the deformation of the front floor panel 10 between the side shim 14 on the collision side and the floor frame 16, and the intrusion of the side shim 14 on the collision side inside the vehicle width direction is effective. To be suppressed. Since the bead 20 has a mountain-shaped cross-sectional shape with multiple upper and lower steps and the front floor panel 10 is not easily deformed, it becomes more prominent.

  The second welding site Wi on the collision side is prevented from having a large peeling force acting on the second welding site Wi when the second deformation allowing portion Di is deformed. Further, the electrodeposition paint groove 11 is deformed in a direction in which the second welded portion Wi is peeled off due to the side impact load, but the body of the electrodeposition paint groove 11 in the portion 11A where the floor frame 16 and the front cross member 18 intersect with each other. Since the width in the width direction is narrower than that of the other portion 11B, the flat surface around the second welded portion Wi can be expanded, that is, the flat surface around the second welded portion Wi can be increased. Thereby, the deformation | transformation of the 2nd welding site | part Wi periphery is suppressed, and it becomes difficult to peel the 2nd welding site | part Wi further.

  For these reasons, peeling does not occur in the second welded portion Wi. As a result, the front cross member 18 and the front floor panel 10 on the inner side in the vehicle width direction from the second welded portion Wi are restrained from being deformed inward in the vehicle width direction. Intrusion is restricted.

  The bead 20 on the inner side in the vehicle body width direction from the floor frame 16 increases the rigidity of the front floor panel 10 on the inner side in the vehicle body width direction from the floor frame 16 coupled with the fact that the second welded portion Wi does not peel off, and the front floor panel 10 is deformed. It works effectively so as not to. This becomes more prominent because the bead 20 has an upper and lower multi-level chevron cross-sectional shape.

  Further, the center portion in the vehicle width direction of the front cross member 18, in other words, the front cross member 18 on the inner side in the vehicle width direction from the floor frame 16 is reinforced by the minimum reinforcing member 22. The deformation of the cross member 18 is suppressed, and the collision-side side shim 14 is suppressed from entering the vehicle width direction inside. Further, this effect is also obtained by the tunnel cross member 24, and the side cross shim 14 on the collision side is prevented from entering inwardly in the vehicle width direction and is accurately suppressed by adding the minimum tunnel cross member 24.

  As a result, it is possible to better secure the vehicle interior space at the time of a side collision without hindering the effect of improving the vehicle body rigidity by the front cross member 18, and includes a canister disposed between the left and right floor frames 16. The damage prevention of the fuel system apparatus is also better performed.

  Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to such embodiments so that those skilled in the art can easily understand, and departs from the spirit of the present invention. It is possible to change appropriately within the range not to be. In addition, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Front floor panel 11 Electrodeposition coating groove 14 Side shim 16 Floor frame 16A Channel shape part 16Bi Flange piece (inner flange piece)
16Bo flange piece (outer flange piece)
18 Front cross member 18A Channel shape portion 18B Flange piece 18C, 18D Projection piece 20 Bead 22 Reinforcement member 24 Tunnel cross member 26 Tunnel frame 28 Rear cross member Do First deformation allowance portion Di Second deformation allowance portion Lo First Distance Li Second distance Wo First welded portion Wi Second welded portion a Open end

Claims (6)

A floor panel, left and right side shims joined to the left and right edges of the floor panel and extending in the longitudinal direction of the vehicle body, and a channel shape opening upward in the vehicle longitudinal direction from the side shim in the vehicle body width direction are formed. And left and right floor frames joined to the lower surface of the floor panel via flange pieces extending from the channel-shaped opening end toward the left and right outer sides, and extending in the vehicle body width direction, at the left and right width direction ends. The cross member is formed in a downwardly open channel shape joined to the side shim and joined to the upper surface of the floor panel via a flange piece extending from the open end of the channel shape toward the vehicle body front-rear direction outer side. A floor structure of an automobile having
The two flange pieces of the cross member are spot welded to a flange piece on the outer side in the vehicle body width direction of the floor frame across the floor panel at a first welding site at a first distance from each other. Both flange pieces are spot-welded at a second welding site with a second distance between the flange pieces on the inner side in the vehicle body width direction of the floor frame across the floor panel,
When the second distance is larger than the first distance, a second deformation allowing portion formed between the second welded portion and the corresponding open end of the channel shape is A vehicle floor structure configured to be larger than a first deformation allowing portion formed between a first welded portion and a corresponding opening end of the channel shape.   2. The automobile floor structure according to claim 1, wherein the flange piece of the cross member has a protruding piece that locally extends outwardly, and the second welding portion is provided on the protruding piece.   The automobile floor structure according to claim 1, wherein a bead extending in a vehicle body width direction is formed at an arrangement position of the cross member of the floor frame.   The automobile floor structure according to claim 3, wherein the bead has an upper and lower multi-level chevron cross-sectional shape.   5. The channel-shaped reinforcing member is joined to the inside of the cross member on the inner side in the vehicle body width direction from the welded portion between the cross member and the floor frame sandwiching the floor panel. The car floor structure described.   The floor panel is formed with an electrodeposition paint groove extending in the longitudinal direction of the vehicle body at a position aligned with the floor frame in the vehicle body width direction, and the electrodeposition paint groove is a portion where the floor frame and the cross member intersect. The vehicle floor structure according to any one of claims 1 to 5, wherein a width in the vehicle body width direction is narrower than other parts, and a flat surface around the second welded part is enlarged.

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