JP5468637B2 - Auto body floor structure - Google Patents

Description

  The present invention provides a side sill that connects the rear edge of the dashboard lower panel and the front edge of the front floor panel with a joint line extending in the vehicle width direction, and extends the outer edge in the vehicle width direction of the dashboard lower panel and the front floor panel in the front-rear direction. And a floor frame extending in the front-rear direction is connected to the upper surface of the dashboard lower panel and the front floor panel on the inner side in the vehicle width direction than the side sill.

  When a car collides with a narrow offset front, a large collision load is input from the left and right front side frames to the front part of the left and right side sills, and the front part of the side sill is deformed so that it falls inward in the vehicle width direction. There is a problem of narrowing.

  Therefore, by connecting a diagonal member extending diagonally inward in the vehicle width direction from the front end of the side sill to the floor frame, a load that causes the side sill to fall inward in the vehicle width direction through the diagonal member. Patent Document 1 below discloses that a side sill is prevented from falling by a reaction force received by a diagonal member from a floor frame.

JP 2003-237636 A

  By the way, the rear edge of the dashboard lower panel and the front edge of the front floor panel are overlapped with a joint line extending in the vehicle width direction and spot welded, but in order to prevent water from entering the vehicle interior from the gap between the weld points. In addition, a waterproof treatment is required in which a dust sealer is applied to the joint line.

  However, since the diagonal member arranged in the oblique direction crosses above the joining line, the one described in Patent Document 1 has a problem that the diagonal member interferes with the dust sealer coating operation. .

  The present invention has been made in view of the above-described circumstances, and the dust sealer is applied to the joining line of the dashboard lower panel and the front floor panel while preventing the front portion of the side sill from falling inward in the vehicle width direction due to a collision load. The purpose is to make it possible.

  To achieve the above object, according to the first aspect of the present invention, the rear edge of the dashboard lower panel and the front edge of the front floor panel are connected by a joint line extending in the vehicle width direction, and the dashboard lower panel is connected. And an outer edge in the vehicle width direction of the front floor panel is connected to a side sill extending in the front-rear direction, and a floor frame extending in the front-rear direction is connected to the upper surface of the dashboard lower panel and the front floor panel on the inner side in the vehicle width direction than the side sill A vehicle body floor structure, wherein a floor gusset extending in a vehicle width direction and connecting the side sill and the floor frame is disposed on an upper surface of the front floor panel along the joining line. A vehicle floor structure is proposed.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the floor gusset is connected to the inner surface in the vehicle width direction of the side sill and the upper surface of the floor frame with bolts. A vehicle body floor structure is proposed.

  According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 2, the floor gusset includes a first member constituting an upper wall, a lower wall, a front wall, and a rear wall. A member having a closed cross-section connected to the second member, and connecting a first connection portion, which is bent upward in the vehicle width direction outer end of the upper wall, to an inner surface in the vehicle width direction of the side sill, A second connecting portion that extends inward in the vehicle width direction is connected to the upper surface of the floor frame, and a side wall that is bent inward in the vehicle width direction of the lower wall is a vehicle width of the floor frame. A vehicle body floor structure is proposed which is characterized by facing the outer surface in the direction.

  According to the invention described in claim 4, in addition to the configuration of claim 3, the third connection part in which the upper end of the side wall is bent inward in the vehicle width direction overlaps the second connection part, and A vehicle body floor structure characterized by being connected to the upper surface of a floor frame is proposed.

  According to the invention described in claim 5, in addition to the configuration of claim 3 or claim 4, a bulging portion that bulges downward is formed in the lower wall continuous to the vehicle width direction outer side of the side wall. A vehicle body floor structure characterized by the above is proposed.

  According to the invention described in claim 6, in addition to the configuration of any one of claims 3 to 5, the second connection portion is connected to the upper surface of the floor frame with a bolt, and the upper A vehicle body floor structure is proposed in which a bead is formed on the wall so as to protrude at the same height as the head of the bolt and extend in the vehicle width direction.

  According to a seventh aspect of the present invention, in addition to any one of the third to sixth aspects, a bead extending in the vehicle width direction is formed on the lower wall. A floor structure is proposed.

  According to the invention described in claim 8, in addition to the structure of any one of claims 3 to 7, a gap is formed in the connection portion of the first member and the second member. A featured vehicle body floor structure is proposed.

  According to the configuration of claim 1, since the side sill and the floor frame are connected by the floor gusset extending in the vehicle width direction, when the collision load of the narrow offset frontal collision is input to the front end of the side sill, the side sill falls in the vehicle width direction inward. The load to be transmitted is transmitted to the floor frame via the floor gusset, and the side sill can be prevented from falling by the reaction force that the floor gusset receives from the floor frame. Moreover, the floor gusset is arranged on the upper surface of the front floor panel along the joint line between the rear edge of the dashboard lower panel and the front edge of the front floor panel, so that the joint line is prevented from being covered by the floor gusset. The dust sealer can be applied to the joining line.

  According to the second aspect of the present invention, since the floor gusset is connected to the inner surface in the vehicle width direction of the side sill and the upper surface of the floor frame with bolts, not only the installation work of the floor gusset is facilitated, but also the dashboard lower panel and the front floor It becomes possible to attach the floor gusset after the dust sealer is applied to the joining line of the frame, and the dust sealer application work becomes easier.

  According to the configuration of claim 3, the floor gusset has a closed cross section in which the first member of the press product that constitutes the upper wall and the second member of the press product that constitutes the lower wall, the front wall, and the rear wall are connected. Therefore, it is possible to use a high-strength steel plate that can be press-formed, and the strength of the floor gusset increases. In addition, the first connecting portion, which is bent upward in the vehicle width direction outer end of the upper wall, is connected to the inner surface in the vehicle width direction of the side sill, and the second connection portion is extended inward in the vehicle width direction of the upper wall. Is connected to the upper surface of the floor frame, and the side wall of the lower wall that is bent upward is opposed to the outer surface of the floor frame in the vehicle width direction. A sufficient reaction force can be generated by reliably transmitting the load to the floor frame.

  According to the configuration of claim 4, the third connection part in which the upper end of the side wall is bent inward in the vehicle width direction is overlapped with the second connection part and connected to the upper surface of the floor frame. Can be firmly connected to generate a sufficient reaction force from the floor frame toward the floor gusset.

  According to the fifth aspect of the present invention, since the bulging portion that bulges downward is formed in the lower wall that continues to the vehicle width direction outside of the side wall, the height of the side wall is increased by the bulging portion, and the floor frame is moved to the floor. A sufficient reaction force can be generated toward the gusset, and a space for arranging the melt sheet can be secured between the lower wall and the front floor panel.

  According to the structure of claim 6, since the bead extending in the vehicle width direction is formed on the upper wall, not only can the rigidity of the floor gusset be increased by the bead to prevent the front end of the side sill from falling down more reliably, Since the protruding height of the bead is the same as the head of the bolt that connects the second connecting portion to the upper surface of the floor frame, the bead does not affect the floor carpet laid on the upper surface of the front floor panel.

  According to the seventh aspect of the present invention, since the bead extending in the vehicle width direction is formed on the lower wall, the rigidity of the floor gusset can be increased by the bead, and the front sill of the side sill can be prevented from falling down more reliably.

  Further, according to the configuration of the eighth aspect, since the gap is formed in the connecting portion of the first member and the second member, the floor is removed from the gap when the vehicle body is immersed in the electrodeposition paint tank in order to prevent the occurrence of rust. The electrodeposition paint can be surely infiltrated into the gusset.

The perspective view of the flame | frame of the vehicle body center part of a motor vehicle. FIG. 2 is a two-direction arrow view of FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a six-direction exploded view of FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Note that the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction in this specification are based on the driver seated in the driver's seat.

  As shown in FIGS. 1 and 2, a floor tunnel 13 having an inverted U-shaped cross section extending in the front-rear direction is projected upward at the center in the vehicle width direction of the front floor panel 12 connecting the left and right side sills 11, 11. The The left and right side sills 11, 11 and the floor tunnel 13 are connected by cross members 14, 14 extending in the vehicle width direction, and the left and right floor frames 15, 15 extending in the front-rear direction penetrate the cross members 14, 14 from the front to the rear. After that, it bends outward in the vehicle width direction and is connected to the inner surfaces of the side sills 11, 11 in the vehicle width direction. The front edge of the front floor panel 12 and the rear edge of the dashboard lower panel 16 are overlapped and connected at a joint line L extending in the vehicle width direction. The left and right floor gussets 22 and 22 are arranged in the vehicle width direction along the upper surface of the front floor panel 12 and along the rear side of the joint line L, and the outer ends in the vehicle width direction are the vehicle width directions of the side sills 11 and 11. Connected to the inner surface, the inner end in the vehicle width direction is connected to the upper surfaces of the front portions of the floor frames 15 and 15.

  Next, based on FIGS. 2 to 6, the structure of the floor gussets 22 and 22 and the structure of the connecting portion for connecting the left and right ends of the floor gussets 22 and 22 to the side sills 11 and 11 and the floor frames 15 and 15 will be described in detail. Describe.

  The floor gusset 22 is a member having a closed cross section in which the first member 17 on the upper side and the second member 18 on the lower side are joined. The first member 17 formed by press-forming a high-strength steel plate constitutes the upper wall 17a and has a high strength. A steel plate is press-formed, and the second member 18 constitutes a lower wall 18a, a front wall 18b, and a rear wall 18c. The first member 17 includes a first connection portion 17b in which the outer end in the vehicle width direction of the upper wall 17a is bent upward in a flange shape, and a second connection portion 17c in which the inner end in the vehicle width direction of the upper wall 17a is horizontally extended. The flanges 17d, 17d projecting forward and backward from the front and rear edges of the upper wall 17a, and two front and rear beads 17e, 17e formed on the upper wall 17a and extending in the vehicle width direction are provided. Front and rear two bolt holes 17f and 17f (see FIG. 6) are formed in the first connection portion 17b, and front and rear two bolt holes 17g and 17g (see FIG. 6) are formed in the second connection portion 17c. .

  The second member 18 includes joint flanges 18d and 18d in which the upper end of the front wall 18b and the upper end of the rear wall 18c are bent forward and backward, respectively, and a side wall 18e in which the inner end in the vehicle width direction of the lower wall 18a is bent upward. A third connecting portion 18f where the upper end of the side wall 18e is bent inward in the vehicle width direction, a bulging portion 18g in which a vehicle width direction inner side portion of the lower wall 18a connected to the lower end of the side wall 18e is bulged downward, and a lower wall And a bead 18h formed in 18a and extending in the vehicle width direction.

  Spot welding w1 is performed by superimposing the lower surfaces of the front and rear joining flanges 17d and 17d of the first member 17 on the upper surfaces of the front and rear joining flanges 18d and 18d of the second member 18, and the second connecting portion 17c of the first member 17 is The floor gusset 22 is configured by integrally joining the first member 17 and the second member 18 by spot welding w2 by superimposing the lower surface on the upper surface of the third connecting portion 18f of the second member 18. At this time, a predetermined gap α (see FIGS. 4 and 5) is provided between adjacent spot welding w1 portions of the front and rear joining flanges 17d and 17d of the first member 17 and the front and rear joining flanges 18d and 18d of the second member 18. ) Is formed.

  The side sill 11 is a member having a closed cross section in which the joint flanges 19a and 19b of the side sill inner 19 and the joint flanges 20a and 20b of the side sill outer 20 are welded w3 with the stiffener 21 interposed therebetween, and the outer edge of the front floor panel 12 in the vehicle width direction. The welding flange 12a of the side sill inner 19 is welded w4 on the inner surface in the vehicle width direction. The floor frame 15 is a member having a “U” -shaped cross section with an open bottom surface, and joining flanges 15 a and 15 b formed on the left and right side edges are superimposed on the top surface of the front floor panel 12 and are welded w5.

  The first connecting portion 17b of the first member 17 of the floor gusset 22 is superimposed on the inner surface in the vehicle width direction of the side sill inner 19, and the two bolts 23 and 23 and the two weld nuts 24 passing through the bolt holes 17f and 17f. , 24 are fastened to the side sill inner 19. The second connecting portion 17c of the first member 17 of the floor gusset 22 is overlapped on the upper surface of the floor frame 15, and is constituted by two bolts 25, 25 and two weld nuts 26, 26 penetrating the bolt holes 17g, 17g. Fastened to the floor frame 15. At this time, the side wall 18e of the second member 18 of the floor gusset 22 abuts on the side wall 15c of the floor frame 15 facing outward in the vehicle width direction (see FIGS. 3 and 4).

  A melt sheet that exhibits an adhesive effect by being melted by heating in a space formed between the lower surface of the bead 18h of the lower wall 18a of the second member 18 of the floor gusset 22 and the upper surface of the front floor panel 12 opposed thereto. 27 (see FIGS. 3 to 5) is arranged.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  Since the side sill 11 and the floor frame 15 are connected by the floor gusset 22 extending in the vehicle width direction, when the collision load when the automobile collides with the narrow offset front face is input to the front end of the side sill 11, the side sill 11 is inward in the vehicle width direction. The load to fall down is transmitted to the floor frame 15 via the floor gusset 22, and the side sill 11 can be prevented from falling by the reaction force that the floor gusset 22 receives from the floor frame 15.

  In order to prevent water from entering the vehicle interior from the joint line L where the front edge of the front floor panel 12 and the rear edge of the dashboard lower panel 16 are overlapped and spot welded, a dust sealer is applied to the joint line L1. However, since the floor gusset 22 is arranged along the rear of the joining line L without covering the joining line L from above, it is possible to prevent the floor gusset 22 from interfering with the dust sealer application work. . Moreover, since the floor gusset 22 is assembled by joining the first member 17 and the second member 18, the floor gusset 22 is fastened to the side sill 11 and the floor frame 15 with the bolts 23, 23, 25, 25. After application, the floor gusset 22 can be attached, and the dust sealer application operation is further facilitated.

  The floor gusset 22 is a member having a closed cross section in which the first member 17 of the press product constituting the upper wall 17a and the second member 18 of the press product constituting the lower wall 18a, the front wall 18b and the rear wall 18c are connected. Therefore, it becomes possible to use high-strength steel plates for the first member 17 and the second member 18, and the strength of the floor gusset 22 is increased. In addition, the first connecting portion 17b, which is bent outward in the vehicle width direction of the upper wall 17a, is connected to the inner surface in the vehicle width direction of the side sill inner 19, and the inner end in the vehicle width direction of the upper wall 17a is extended inward in the vehicle width direction. Since the second connecting portion 17c is connected to the upper surface of the floor frame 15, and the side wall 18e bent upward in the vehicle width direction of the lower wall 18a is brought into contact with the side wall 15c of the floor frame 15 on the outer side in the vehicle width direction. The inward load in the vehicle width direction input from the front end of the side sill 11 is reliably transmitted to the floor frame 15 via the floor gusset 22, and a sufficient reaction force is generated on the floor frame 15 to further prevent the side sill 11 from falling. It can be surely prevented.

  At this time, the third connection portion 18f, in which the upper end of the side wall 18e of the second member 18 is bent inward in the vehicle width direction, is overlapped with the second connection portion 17c of the first member 17 and connected to the upper surface of the floor frame 15. The floor frame 15 and the floor gusset 22 can be firmly connected to generate a sufficient reaction force from the floor frame 15 toward the floor gusset 22.

  In addition, since a part of the lower wall 18a connected to the outer side in the vehicle width direction of the side wall 18e of the second member 18 is bulged downward to form the bulged part 18g, the height of the side wall 18e is increased by the bulged part 18g. A sufficient reaction force can be generated from the floor frame 15 toward the floor gusset 22 (see FIGS. 3 and 4), and the space in which the melt sheet 27 is disposed between the lower wall 18a and the front floor panel 12 Can be secured.

  Further, since the beads 17e, 17e extending in the vehicle width direction are formed on the upper wall 17a of the first member 17, and the beads 18h extending in the vehicle width direction are formed on the lower wall 18a of the second member 18, the beads 17e, 17e, 18h can increase the rigidity of the floor gusset 22 and more reliably prevent the front sill 11 from falling over. Moreover, since the projecting heights of the beads 17e and 17e of the first member 17 are the same as the heads of the bolts 25 and 25 that connect the second connecting portion 17c to the upper surface of the floor frame 15 (see FIGS. 4 and 5), The beads 17e, 17e do not affect the floor carpet laid on the upper surface of the front floor panel 12.

  In addition, since the gap α is formed at the connecting portion of the joining flanges 17d and 17d of the first member 17 and the joining flanges 18d and 18d of the second member 18 (see FIGS. 4 and 5), an electric current is prevented in order to prevent the occurrence of rust. When the vehicle body is immersed in the paint coating tank, the electrodeposition paint can be reliably infiltrated into the floor gusset 22 from the gap α.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the side wall 18e of the second member 18 is in contact with the side wall 15c on the outer side in the vehicle width direction of the floor frame 15, but a minute gap is formed between the side walls 18e and 15c, and the floor gusset 22 Both side walls 18e and 15c may be brought into contact with each other when an inward load in the vehicle width direction is input.

11 Side sill 12 Front floor panel 15 Floor frame 16 Dashboard lower panel 17 First member 17a Upper wall 17b First connection portion 17c Second connection portion 17e Bead 18 Second member 18a Lower wall 18b Front wall 18c Rear wall 18e Side wall 18f Third Connection part 18g Expansion part 18h Bead 22 Floor gusset 23 Bolt 25 Bolt L Joining line α Clearance

Claims (8)

A rear edge of the dashboard lower panel (16) and a front edge of the front floor panel (12) are connected by a joint line (L) extending in the vehicle width direction, and the dashboard lower panel (16) and the front floor panel (12) are connected. An outer edge in the vehicle width direction is connected to a side sill (11) extending in the front-rear direction, and a floor frame (15) extending in the front-rear direction is connected to the dashboard lower panel (16) and the front on the inner side in the vehicle width direction than the side sill (11). A vehicle body floor structure connected to an upper surface of a floor panel (12),
A floor gusset (22) extending in the vehicle width direction and connecting the side sill (11) and the floor frame (15) is disposed on the upper surface of the front floor panel (12) along the joining line (L). Automobile body floor structure characterized by   The automobile according to claim 1, wherein the floor gusset (22) is connected to the inner surface in the vehicle width direction of the side sill (11) and the upper surface of the floor frame (15) with bolts (23, 25). Body floor structure.   The floor gusset (22) includes a first member (17) constituting an upper wall (17a) and a second member (18) constituting a lower wall (18a), a front wall (18b) and a rear wall (18c). Are connected to the inner surface in the vehicle width direction of the side sill (11), the first connection portion (17b) bent upward in the vehicle width direction outer end of the upper wall (17a), A second connection portion (17c), in which the inner end in the vehicle width direction of the upper wall (17a) extends inward in the vehicle width direction, is connected to the upper surface of the floor frame (15), and the vehicle width of the lower wall (18a) The vehicle body floor structure according to claim 1 or 2, characterized in that a side wall (18e) whose inner end in a direction is bent upward is opposed to an outer surface in the vehicle width direction of the floor frame (15).   A third connection part (18f), in which the upper end of the side wall (18e) is bent inward in the vehicle width direction, is overlapped with the second connection part (17c) and connected to the upper surface of the floor frame (15). The vehicle body floor structure according to claim 3.   The automobile according to claim 3 or 4, wherein a bulging portion (18g) that bulges downward is formed on the lower wall (18a) continuous to the vehicle width direction outer side of the side wall (18e). Car body floor structure.   The second connecting portion (17c) is connected to the upper surface of the floor frame (15) with a bolt (25), and protrudes to the upper wall (17a) at the same height as the head of the bolt (25). The vehicle body floor structure according to any one of claims 3 to 5, wherein a bead (17e) extending in a direction is formed.   The vehicle body floor structure according to any one of claims 3 to 6, wherein a bead (18h) extending in a vehicle width direction is formed on the lower wall (18a).   The vehicle body according to any one of claims 3 to 7, wherein a gap (α) is formed in a connecting portion between the first member (17) and the second member (18). Floor structure.

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