JP7779050B2 - Vehicle floor structure - Google Patents

Description

The present invention relates to a vehicle floor structure.

The floor panel that makes up the floor of the vehicle body has a floor tunnel that extends in the fore-and-aft direction of the vehicle with the upper surface of the floor panel raised, and side sills that extend in the fore-and-aft direction of the vehicle are provided on both sides of the floor panel in the width direction of the vehicle. In this type of structure, for example, as disclosed in Patent Document 1, a floor cross member that extends in the width direction of the vehicle is provided on the upper surface of the floor panel between the side sill and the floor tunnel.

In this example, the side sill and the outer portion of the floor cross member in the vehicle width direction are spaced apart, and a connecting member is provided in this space. The connecting member is configured to connect the side of the side sill to the outer portion of the floor cross member.

JP 2010-228482 A

In structures like the example above, where the floor cross member and side sill are spaced apart, cables are generally passed through this space. This prevents uneven surfaces from being placed where passengers in the rear seats place their feet.

However, if the floor cross member and the side sill are spaced apart, it may be difficult to ensure a certain level of rigidity against impact loads from the outside of the vehicle width, such as in a side collision. In other words, while providing such a space makes it easier to route cables, it may make it more difficult to ensure side collision performance. Therefore, there is room for improvement in the structure in the above example in order to achieve both improved cable assembly ease and side collision performance.

The present invention was made to solve the above-mentioned problems, and its purpose is to provide a vehicle floor structure that allows cables to be easily installed between the side sill and floor cross member while maintaining side impact performance.

In order to achieve the above-mentioned object, the vehicle floor structure of the present invention comprises a floor panel arranged on the floor of the vehicle body, a side sill arranged on the outer side of the floor panel in the vehicle width direction and extending in the fore-and-aft direction of the vehicle, and a cable arranged on the upper side of the outer side of the floor panel in the vehicle width direction and on the inner side of the side sill in the vehicle width direction. In the floor structure of the vehicle, a cross member extending in the vehicle width direction is provided on an upper surface of the floor panel, an end of the cross member is joined to the side sill, the cross member has a convex cross section that protrudes upward from the vehicle, a bracket is provided on the end of the cross member in the vehicle width direction, a front wall of the bracket has a front opening, and a rear wall of the bracket has a rear opening, the front opening and the rear opening are arranged to overlap the convex shape when viewed in the vehicle front-rear direction, an upper surface portion having a linear portion extending in the vehicle width direction and arranged at a distance from the floor panel is provided at an upper surface of the convex shape, and the upper surface portion is located above the upper ends of the opening edges of the front opening and the rear opening. is disposed below the vehicle, the cable is disposed so as to follow the upper surface portion of the convex shape and passes through the front opening and the rear opening , inclined wall portions are formed at the front and rear portions constituting the convex shape so as to approach each other as they extend upward in the vehicle, and the inclination angles of the inclined wall portions at the front and rear portions are set smaller than the inclination angles of the front wall portion and the rear wall portion of the bracket, a lower end of the inclined wall portion located outward in the vehicle width direction from an inner side wall of the bracket in the vehicle width direction is farther away from an upper end of the inclined wall portion than a lower end of the inclined wall portion located inward in the vehicle width direction from the side wall, and a vertical wall extending in the vehicle width direction is formed on the inner side of the inclined wall portion located outward in the vehicle width direction .

This invention makes it possible to easily assemble cables between the side sill and floor cross member while maintaining side impact performance.

1 is a perspective view showing an embodiment of a vehicle floor structure according to the present invention; FIG. 2 is an enlarged perspective view showing the right outer seat bracket and its surroundings in FIG. 1 . 3 is a top view of the left outer seat bracket and the like of FIG. 2 as viewed from above the vehicle. 3 is a schematic cross-sectional view taken along the line AA in FIG. 2. 3 is a schematic cross-sectional view taken along the line BB in FIG. 2. FIG. 2 is a plan view of the first floor cross member of FIG. 1 alone.

One embodiment of a vehicle floor structure according to the present invention will now be described with reference to the drawings (Figs. 1 to 6). In the drawings, the direction of arrow Fr indicates the front in the longitudinal direction of the vehicle. In the description of the embodiment, the "front portion (front end) and rear portion (rear end)" correspond to the front and rear in the longitudinal direction of the vehicle. Additionally, arrows R and L indicate the right and left sides when an occupant is looking forward of the vehicle.

As shown in Figures 1 to 3, the vehicle floor structure of this embodiment includes a floor panel 1, a floor tunnel 10, a side sill 15, a first floor cross member (cross member) 20, a second floor cross member 29, a floor side member 14, an outer seat bracket (bracket) 30, and an inner seat bracket 38, and a cable 40 is routed inside the side sill 15 in the vehicle width direction.

The floor panel 1 is a panel material placed on the floor portion of the vehicle body. In this example, the floor panels 1 are placed on the left and right sides of the floor tunnel 10. Each of the left and right floor panels 1 extends from the lower end of the dash panel 2 toward the rear of the vehicle.

As shown in Figures 1 to 3, the floor tunnel 10 is a member that extends in the fore-and-aft direction of the vehicle, protruding from the upper surface of the floor panel 1 above the vehicle. The floor tunnel 10 has a tunnel upper surface 11 that extends in the fore-and-aft direction of the vehicle, and tunnel side walls 12 that are provided on the left and right ends of the tunnel upper surface 11 and extend in the fore-and-aft direction of the vehicle. The tunnel side walls 12 slope outward in the vehicle width direction as they extend from the outer end of the tunnel upper surface 11 toward the bottom of the vehicle, and the lower end of the tunnel side walls 12 is joined to the inner end of the floor panel 1 in the vehicle width direction. In this example, a flange that protrudes in the vehicle width direction is provided at the lower end of the tunnel side walls 12, and this flange is joined to the inner end of the floor panel 1 in the vehicle width direction by spot welding.

As shown in Figures 2 and 3, the side sill 15 is a member provided at the outer end of the floor panel 1 in the vehicle width direction and extending in the vehicle's fore-and-aft direction. While detailed illustrations are omitted, the side sill 15 has an inner member 16 extending in the vehicle's fore-and-aft direction and an outer member extending in the vehicle's fore-and-aft direction.

As shown in Figures 2 and 3, the inner member 16 has an inner wall portion 16a facing the inside in the vehicle width direction, an upper surface portion (top surface portion) 16b extending from the upper end of the inner wall portion 16a toward the outside in the vehicle width direction, and a flange portion 16c protruding above the vehicle from the outer end of the upper surface portion 16b in the vehicle width direction. The outer member is positioned outside the inner member 16 in the vehicle width direction and has an outer wall portion, an upper surface portion extending inward in the vehicle width direction from the upper end of the outer wall portion, and a flange portion protruding above the vehicle from the inner end of the upper surface portion in the vehicle width direction.

The flange portion 16c of the inner member 16 and the flange portion of the outer member are joined by spot welding or the like. A description of the structure of the lower part of the side sill 15 will be omitted.

Next, the first floor cross member 20 will be described. As shown in Figures 1, 2, and 5, the first floor cross member 20 is a member that extends linearly in the vehicle width direction and is provided on the upper surface of the floor panel 1. In this example, multiple flanges provided on the lower part of the first floor cross member 20 are joined to the upper surface of the floor panel 1 by spot welding or the like. Joints such as flanges will be described later. Furthermore, one end of the first floor cross member 20 is joined to the side sill 15, and the other end is joined to the floor tunnel 10. In this example, the outer end of the first floor cross member 20 in the vehicle width direction is joined to the inner wall portion 16a of the inner member 16 of the side sill 15 by spot welding or the like, and the inner end of the first floor cross member 20 in the vehicle width direction is joined to the tunnel side wall portion 12 of the floor tunnel 10 by spot welding or the like.

The first floor cross member 20 is a member that extends in the vehicle width direction as a whole and has a convex cross-sectional shape that protrudes upward from the vehicle. As shown in Figure 5, the first floor cross member 20 has a member upper surface portion (upper surface portion) 21 located at the top of the convex shape, a member front portion 22 located at the front of the convex shape, and a member rear portion 25 located at the rear of the convex shape. Details of the first floor cross member 20 will be described later.

Next, the outer seat bracket 30 and inner seat bracket 38 will be described. As shown in Figures 2 to 5, the outer seat bracket 30 and inner seat bracket 38 are components for installing a vehicle seat, and, for example, a slide member (not shown) for sliding the vehicle seat in the fore-and-aft direction of the vehicle is fixed to them. In this embodiment, the outer seat bracket 30 is a box-shaped component with a rectangular upper surface and four side walls surrounding it, and is provided on the outer side of the first floor cross member 20 in the vehicle width direction.

The shape of the outer seat bracket 30 will be described below. As shown in Figures 2 to 5, the outer seat bracket 30 has a bracket upper surface portion 31, a bracket front wall portion 32, a bracket rear wall portion 33, a bracket inner wall portion 34, and a bracket outer wall portion 35.

As shown in Figures 2 and 3, the bracket upper surface 31 is located at the top of the outer seat bracket 30 and has a generally rectangular flat surface facing upward toward the vehicle. The bracket upper surface 31 is provided with through holes, for example, for installing seat rails, etc.

As shown in Figures 2 and 3, the bracket front wall 32 is a wall facing the front of the vehicle and is inclined toward the front of the vehicle from the front end (front edge) of the bracket upper surface 31 toward the bottom of the vehicle. The bracket front wall 32 also has a front opening 32a through which cables 40 and the like can be inserted. The front opening 32a is formed by cutting out the outer and lower parts of the bracket front wall 32 in the vehicle width direction. The opening edge of the front opening 32a has a curved shape and extends to the side sill 15, and is provided with a protruding edge 32e that protrudes toward the front of the vehicle. The bracket front wall 32 also has a front bracket flange 32b and a front outer bracket flange 32c.

As shown in Figures 3 and 5, the front bracket flange portion 32b protrudes forward from the vehicle widthwise inner portion of the lower end of the bracket front wall portion 32, on the vehicle widthwise inner side of the lower edge of the front opening 32a. The front bracket flange portion 32b is joined by spot welding or the like to the lower step portion 23g of the front lower member flange portion 23 located in the front portion of the first floor cross member 20. The front lower member flange portion 23 will be described later. The front outer bracket flange portion 32c protrudes forward from the vehicle widthwise outer end of the bracket front wall portion 32, on the vehicle widthwise outer side of the upper edge of the front opening 32a. The front outer bracket flange portion 32c has a surface facing outward in the vehicle width direction, and this surface is joined by spot welding or the like to the inner wall portion 16a of the inner member 16 of the side sill 15.

As shown in FIG. 3 , the bracket rear wall 33 is a wall facing the rear of the vehicle and is inclined toward the rear of the vehicle from the rear end (rear edge) of the bracket upper surface 31 toward the bottom of the vehicle. The bracket rear wall 33 also has a rear opening 33a through which cables 40 and the like can be inserted. The rear opening 33a is formed by cutting out the outer and lower parts of the bracket rear wall 33 in the vehicle width direction. The bracket rear wall 33 also has a rear bracket flange 33b and a rear outer bracket flange 33c.

As shown in Figures 3 and 5, the rear bracket flange portion 33b protrudes rearward from the vehicle widthwise inner portion of the lower end of the bracket rear wall portion 33, on the vehicle widthwise inner side of the lower edge of the rear opening 33a. The rear bracket flange portion 33b is joined by spot welding or the like to the lower step portion 26g of the rear lower member flange portion 26 located at the rear of the first floor cross member 20. The rear lower member flange portion 26 will be described later. The rear outer bracket flange portion 33c protrudes rearward from the vehicle widthwise outer end of the bracket rear wall portion 33, on the vehicle widthwise outer side of the upper edge of the rear opening 33a. Like the front outer bracket flange portion 32c, the rear outer bracket flange portion 33c has a surface facing outward in the vehicle width direction, and this surface is joined by spot welding or the like to the inner wall portion 16a of the inner member 16 of the side sill 15.

As shown in Figures 2 and 3 , the bracket inner wall portion 34 is a wall portion facing the vehicle width direction inward and slopes inward in the vehicle width direction from the vehicle width direction inner end of the bracket upper surface portion 31 toward the vehicle bottom. The front end of the bracket inner wall portion 34 is connected to the vehicle width direction inner end of the bracket front wall portion 32, forming a corner, and the rear end of the bracket inner wall portion 34 is connected to the vehicle width direction inner end of the bracket rear wall portion 33, forming a corner. The bracket inner wall portion 34 is also provided with an inner bracket flange portion 34a. The inner bracket flange portion 34a protrudes inward in the vehicle width direction from the vehicle front-to-rear direction middle portion of the lower end of the bracket inner wall portion 34 and is joined to the member upper surface portion 21 of the first floor cross member 20 by spot welding or the like. In this example, the inner bracket flange portion 34a is joined to the member upper surface portion 21 while overlapping the vehicle width direction inner portion of the width direction outer bead portion 21d, which will be described later.

As shown in FIG. 3 , the bracket outer wall portion 35 is a wall portion facing outward in the vehicle width direction and slopes inward in the vehicle width direction as it extends from the outer end of the bracket upper surface portion 31 toward the bottom of the vehicle. The front end of the bracket outer wall portion 35 is connected to the outer end of the bracket front wall portion 32 in the vehicle width direction, forming a corner, and the rear end of the bracket outer wall portion 35 is connected to the outer end of the bracket rear wall portion 33 in the vehicle width direction, forming a corner. The bracket outer wall portion 35 is also provided with an upper outer bracket flange portion 35a. The upper outer bracket flange portion 35a protrudes outward in the vehicle width direction from the lower end of the bracket outer wall portion 35 and is joined to the upper surface portion 16b of the inner member 16 of the side sill 15 by spot welding or the like.

In this embodiment, as shown in Figures 2 and 4, the upper outer bracket flange portion 35a, front outer bracket flange portion 32c, and rear outer bracket flange portion 33c of the outer seat bracket 30 are joined to the upper surface portion 16b and inner wall portion 16a of the inner member 16 of the side sill 15, straddling the corner 17 formed by the upper surface portion 16b and inner wall portion 16a. Furthermore, the inner portion in the vehicle width direction at the upper end of the front opening 32a is curved downward.

In addition, in this embodiment, as described above, the front opening 32a and the rear opening 33a are positioned so as to overlap the convex shape of the first floor cross member 20 when viewed in the vehicle's fore-and-aft direction. Furthermore, the cables 40 and the like routed on the vehicle widthwise inner side of the side sill 15 are positioned so as to follow the upper part of the convex shape and pass through the front opening 32a and the rear opening 33a.

By arranging the front opening 32a and rear opening 33a in this manner, the first floor cross member 20 is joined to the floor tunnel 10 and the side sill 15, allowing the cable 40 to easily pass between the first floor cross member 20 and the outer seat bracket 30 while maintaining side impact performance. Although this embodiment describes a structure in which the cable 40 is inserted into the outer seat bracket 30, it does not have to be assembled together with the seat. For example, even a bracket for securing another vehicle component may be used as long as it has a certain level of rigidity. The outer seat bracket 30, as in this embodiment, can be correlated with seat movement, thereby contributing to maintaining the required side impact performance.

Typically, when assembling cables 40, the cables 40 are placed while being pressed against the end of the side sill 15 or floor panel 1. At this time, the worker can see the front opening 32a, etc., facing the first floor cross member 20, reducing the worker's blind spot. This makes it easier for the worker to identify the target for inserting the cables 40. Furthermore, by providing the front opening 32a, etc., in the outer seat bracket 30, it is possible to increase the opening area from a strength perspective compared to a structure in which an opening is provided in the first floor cross member 20. As a result, the workability of assembling the cables 40 is improved. Since no opening is provided in the first floor cross member 20, a decrease in rigidity is suppressed. Furthermore, by providing the outer seat bracket 30 as described above, the cables 40 can be positioned up to a position corresponding to the height of the outer seat bracket 30. This improves the flexibility of routing the cables 40. In this embodiment, the cables 40 are inserted from the front of the vehicle, but this is not limited to this. For example, the cables may be inserted from the rear of the vehicle, i.e., through the rear opening 33a.

As described above, the outer seat bracket 30 is joined to the inner member 16 of the side sill 15, and the outer edges of the front opening 32a and rear opening 33a in the vehicle width direction face the inner wall 16a of the side sill 15. Furthermore, the member upper surface 21 is positioned lower on the vehicle than the upper ends of the opening edges of the front opening 32a and rear opening 33a.

With this configuration, the cable 40 can be inserted with precision, using the corner of the side sill 15 and floor panel 1, as it has an opening facing the side sill 15. In other words, the cable 40 can be inserted at an angle from the floor tunnel 10 toward the side sill 15, improving the workability of assembling the cable 40. Furthermore, because the cable 40 can be inserted obliquely from the side where the floor tunnel 10 is located into the convex shape of the first floor cross member 20, even if the cable 40 moves in the vehicle width direction along the convex shape, it will come into contact with the side sill 15, making it possible to guide the cable 40 in the vehicle's fore-and-aft direction.

In addition, in this embodiment, the opening area of the front opening 32a is set larger than the opening area of the rear opening 33a. The upper end of the first floor cross member 20 is located lower in the vehicle than the upper end of the front opening 32a. Furthermore, the upper end of the rear opening 33a is located lower in the vehicle than the upper end of the front opening 32a, and higher in the vehicle than the upper end of the first floor cross member 20.

Next, the shape of the first floor cross member 20 will be described in detail. First, the member upper surface portion 21 will be described. As shown in FIG. 6, the member upper surface portion 21 has a straight portion 21a and a flared surface portion 21e. The straight portion 21a is generally rectangular and faces upward toward the vehicle, and is disposed parallel to the floor panel 1. The flared surface portion 21e is parallel to the floor panel 1, faces upward toward the vehicle, and is continuous with the straight portion 21a on the inner side in the vehicle width direction. The flared surface portion 21e is formed so that its width in the fore-and-aft direction of the vehicle increases as it moves inward in the vehicle width direction. That is, the front end of the flared surface portion 21e slopes toward the front of the vehicle as it moves inward in the vehicle width direction, and the rear end of the flared surface portion 21e slopes toward the rear of the vehicle as it moves inward in the vehicle width direction. In this example, the front and rear ends of the flared surface portion 21e slope away from each other as they move inward in the vehicle width direction, and are symmetrical with respect to the center line extending in the vehicle width direction between the front and rear ends.

A longitudinal bead portion 21b is provided on the member upper surface portion 21 along the longitudinal direction of the vehicle. The longitudinal bead portion 21b is located between the straight portion 21a and the flared surface portion 21e, is recessed downward from the upper surface of the member upper surface portion 21, and extends in the longitudinal direction of the vehicle. In this example, the longitudinal bead portion 21b extends the entire area of the member upper surface portion 21 from the front end to the rear end.

Furthermore, the straight portion 21a of the member upper surface portion 21 is provided with a widthwise inner bead portion 21c and a widthwise outer bead portion 21d that extend in the vehicle width direction. The widthwise inner bead portion 21c and the widthwise outer bead portion 21d are positioned at the center of the straight portion 21a in the vehicle's fore-and-aft direction, and are spaced apart from each other in the vehicle width direction. The fore-and-aft bead portion 21b is positioned between the vehicle's widthwise inner end of the widthwise inner bead portion 21c and the floor tunnel 10. Note that the widthwise bead portions 21c and 21d are not shown in Figures 1 to 3.

As shown in FIG. 6 , the member front portion 22 has a front inclined wall portion 22a, a front vertical wall portion 22b, a flared wall portion 22c, a front lower member flange portion 23, a front inner member flange portion 24a, and a front outer member flange portion 24b. The front inclined wall portion 22a is a wall portion that extends from the vehicle width direction outer portion of the front end of the flared surface portion 21e and the front end of the straight portion 21a, and is inclined toward the front of the vehicle as it moves downward toward the vehicle, and extends in the vehicle width direction as a whole. The lower end of the front inclined wall portion 22a has a portion that connects to the front vertical wall portion 22b and a portion that connects to the front lower member flange portion 23. The portion that connects to the front lower member flange portion 23 is located on the vehicle width direction outer portion of the lower end of the front inclined wall portion 22a.

The front vertical wall portion 22b is a vertical wall that extends downward in the vehicle width direction from the lower end of the front inclined wall portion 22a. The inner end of the front vertical wall portion 22b in the vehicle width direction is located in the middle of the flared surface portion 21e in the vehicle width direction, and has a tapered shape in which the vehicle's vertical dimension gradually decreases toward the vehicle width inward. In this example, the upper end of the front vertical wall portion 22b extends in the vehicle width direction, and the inner end of the lower end in the vehicle width direction slopes upward in the vehicle width direction toward the vehicle width inward. The inner end of the front vertical wall portion 22b in the vehicle width direction is located adjacent to the inner end of the front inclined wall portion 22a in the vehicle width direction. The upper end of the tapered portion of the front vertical wall portion 22b is connected to the front inclined wall portion 22a, and the lower end of the tapered portion is connected to the flared wall portion 22c.

The vehicle width direction outer end of the front vertical wall portion 22b is located slightly inward of the vehicle width direction outer end of the straight portion 21a of the member upper surface portion 21. Like the inner portion, the vehicle width direction outer portion of the front vertical wall portion 22b has a tapered shape in which the vehicle vertical dimension gradually decreases toward the vehicle width direction outer side. The upper end of the vehicle width direction outer portion of the front vertical wall portion 22b slopes slightly downward toward the vehicle width direction outer side, and the lower end slopes slightly upward toward the vehicle width direction outer side, resulting in the outer portion of the front vertical wall portion 22b having a tapered shape. The front vertical wall portion 22b is not shown in Figures 1 and 3.

Next, the splay wall portion 22c of the member front portion 22 will be described. As shown in FIG. 6 , the splay wall portion 22c is a wall portion formed on the vehicle widthwise inner side of the front inclined wall portion 22a, and is inclined toward the front of the vehicle from the vehicle widthwise inner portion of the front end of the splay surface portion 21e of the member upper surface portion 21 toward the vehicle bottom. Similar to the inclination of the front end of the splay surface portion 21e, the splay wall portion 22c is also inclined toward the front of the vehicle as it moves toward the vehicle widthwise inner side. The vehicle widthwise outer portion of the splay wall portion 22c extends outward in the vehicle widthwise direction beyond the vehicle widthwise inner end of the front vertical wall portion 22b. In this example, the outer end of the splay wall portion 22c is located at a position corresponding to the longitudinal bead portion 21b. The vehicle widthwise inner portion of the front vertical wall portion 22b and the vehicle widthwise outer portion of the splay wall portion 22c are aligned in the vehicle fore-aft direction (vehicle up-down direction).

As shown in Figures 2, 3, and 6, the front lower member flange portion 23 is provided at the front of the first floor cross member 20 and is joined to the floor panel 1 by spot welding or the like. It protrudes forward from the vehicle widthwise outer portions of the lower ends of the spreading wall portion 22c, the lower ends of the front vertical wall portion 22b, and the lower ends of the front inclined wall portion 22a and extends in the vehicle width direction. A step 23e is provided in the vehicle widthwise middle portion of the front lower member flange portion 23, with the upper step 23f located on the vehicle widthwise inner side and the lower step 23g located on the vehicle widthwise outer side. The step 23e is provided at a position corresponding to the inner end of the widthwise outer bead portion 21d located on the vehicle widthwise inner side.

The front end of the upper step 23f has a portion that slopes in the same direction as the front end of the widened surface 21e, and a portion that extends linearly from the outer end of this portion outward in the vehicle width direction. The front end of the lower step 23g has a portion that slopes forward from the step 23e toward the outer side in the vehicle width direction, and a portion that extends linearly from the outer end of this portion outward in the vehicle width direction. As described above, the front bracket flange 32b of the outer seat bracket 30 is joined to the upper surface of the lower step 23g by spot welding or the like.

Next, we will explain the front outer member flange portion 24b and the front inner member flange portion 24a. As shown in Figures 2 and 3, the front outer member flange portion 24b is joined to the inner side wall 16a of the inner member 16 of the side sill 15 by spot welding or the like. It protrudes forward from the vehicle width directional outer end of the front inclined wall portion 22a and has an arc-shaped front end. The lower end of the front outer member flange portion 24b is spaced apart from the vehicle width directional outer end of the lower step portion 23g of the front lower member flange portion 23. The front inner member flange portion 24a is joined to the tunnel side wall portion 12 of the floor tunnel 10 by spot welding or the like and protrudes forward from the vehicle width directional inner end of the widening wall portion 22c. The lower part of the front inner member flange portion 24a is connected to the front lower member flange portion 23. The lower end of the front inner member flange portion 24a is connected to the vehicle widthwise inner end of the upper step portion 23f of the front lower member flange portion 23, forming a corner.

Next, we will explain the member rear portion 25. As shown in Figure 6, the member rear portion 25 is formed line-symmetrically, for example, around the widthwise inner bead portion 21c and the widthwise outer bead portion 21d. The member rear portion 25 has a rear inclined wall portion 25a, a rear vertical wall portion 25b, a flared wall portion 25c, a rear lower member flange portion 26, a rear inner member flange portion 27a, and a rear outer member flange portion 27b. The rear inclined wall portion 25a is formed in the same manner as the front inclined wall portion 22a, and is formed line-symmetrically with respect to the front inclined wall portion 22a, for example, around the widthwise inner bead portion 21c. Similarly, the rear vertical wall portion 25b, the expanding wall portion 25c, the rear lower member flange portion 26, the rear inner member flange portion 27a, and the rear outer member flange portion 27b are formed line-symmetrically with the front vertical wall portion 22b, the expanding wall portion 22c, the front lower member flange portion 23, the front inner member flange portion 24a, and the rear outer member flange portion 27b of the member front portion 22.

In this example, the front inclined wall portion 22a and rear inclined wall portion 25a of the first floor cross member 20 form the front and rear portions of the convex cross section described above, and are inclined so that they approach each other as they extend upward on the vehicle.

Each flange portion is joined in the same manner as the flange portion of the member front portion 22. Specifically, the rear lower member flange portion 26 of the member rear portion 25 is joined to the upper surface of the floor panel 1 by spot welding or the like. The rear inner member flange portion 27a of the member rear portion 25 is joined to the tunnel side wall portion 12 of the floor tunnel 10 by spot welding or the like, and the rear outer member flange portion 27b of the member rear portion 25 is joined to the inner wall portion 16a of the inner member 16 of the side sill 15 by spot welding or the like.

In addition, in this embodiment, the inclination angles of the front inclined wall portion 22a and rear inclined wall portion 25a of the first floor cross member 20 are set smaller than the inclination angles of the bracket front wall portion 32 and bracket rear wall portion 33 of the outer seat bracket 30. The inclination angles are the acute angles formed by the floor panel 1 and the front inclined wall portion 22a and rear inclined wall portion 25a, respectively, and the acute angles formed by the floor panel 1 and the bracket front wall portion 32 and bracket rear wall portion 33, respectively. This configuration reduces the risk of the cable 40 getting caught, thereby improving assembly ease.

In addition, in this embodiment, the lower end of the vehicle widthwise outer portion of the front inclined wall portion 22a of the member front portion 22 (the inclined wall portion located at the vehicle widthwise end of the cross member) is farther from the member upper surface portion 21 (the upper end of the inclined wall portion) than the lower end of the vehicle widthwise intermediate portion of the front inclined wall portion 22a (the inclined wall portion located at the vehicle widthwise intermediate portion of the cross member), and the lower end of the flared wall portion 22c of the member rear portion 25 is farther from the member upper surface portion 21 (the upper end of the inclined wall portion) than the lower end of the rear inclined wall portion 25a. In other words, the lower end of the vehicle widthwise outer portion of the front inclined wall portion 22a is located further forward of the vehicle than the lower end of the vehicle widthwise intermediate portion, and the lower end of the vehicle widthwise outer portion of the rear inclined wall portion 25a is located further rearward of the lower end of the vehicle widthwise intermediate portion.

As described above, the inclined surfaces (the vehicle widthwise outer portions of the front inclined wall portion 22a and the rear inclined wall portion 25a) on the outside of the vehicle of the first floor cross member 20 extend in the fore-and-aft direction of the vehicle, preventing the cable 40 from getting caught and improving the workability of assembling the cable 40. Furthermore, because the front inclined wall portion 22a and the rear inclined wall portion 25a extend in the fore-and-aft direction of the vehicle, the inclined surfaces (the front inclined wall portion 22a and the rear inclined wall portion 25a) can withstand loads from the outside of the side sill 15.

In addition, in this embodiment, for example, the lower end of the front inclined wall portion 22a (inclined wall portion) of the member front portion 22, which is located laterally outboard of the bracket inner wall portion 34 of the outer seat bracket 30, is located further away from the upper end of the front inclined wall portion 22a than the lower end of the front inclined wall portion 22a, which is located laterally inboard of the bracket inner wall portion 34; i.e., it is located further forward of the vehicle. Similarly, the lower end of the rear inclined wall portion 25a (inclined wall portion) of the member rear portion 25, which is located laterally outboard of the bracket inner wall portion 34, is located further away from the upper end of the rear inclined wall portion 25a than the lower end of the rear inclined wall portion 25a, which is located laterally inboard of the bracket inner wall portion 34; i.e., it is located further rearward of the vehicle. In addition, in this example, the lower end of the flared wall portion 22c of the member front portion 22 is located further forward of the lower end of the front inclined wall portion 22a, and the lower end of the flared wall portion 22c of the member rear portion 25 is located further rearward of the lower end of the rear inclined wall portion 25a.

This configuration allows the cable 40 to be routed along the front inclined wall portion 22a and rear inclined wall portion 25a located on the outer side of the first floor cross member 20 in the vehicle width direction at the bottom of the outer seat bracket 30, improving the workability of assembling the cable 40. Furthermore, in this embodiment, the outer seat bracket 30 is joined to the first floor cross member 20. Therefore, the joining strength of the outer seat bracket 30 can be adjusted depending on the installation area of the first floor cross member 20 relative to the floor panel 1. For example, the larger the installation area, the greater the joining strength. As a result, cargo loaded in the vehicle is better protected.

Furthermore, impact loads from the outside of the vehicle on the side sill 15 can be received by the vehicle widthwise outer portions (portions wider than the middle portions) of the front inclined wall portion 22a and the rear inclined wall portion 25a and transmitted to the front vertical wall portion 22b and the rear vertical wall portion 25b. As a result, rigidity and load absorption performance against side collisions are improved.

In this embodiment, the lower portion of the outer seat bracket 30 is joined to the floor panel 1, and the upper portion of the convex shape of the first floor cross member 20 is provided with a member upper surface portion (top surface portion) 21 that is parallel to and spaced from the floor panel 1. For example, when inserting the cable 40 into the front opening 32a or the like, if the cable is inserted too forcefully to match the speed of the vehicle manufacturing line, it may get caught on the outer seat bracket. Even in such a case, because the outer seat bracket 30 is joined to the floor panel 1, the front opening 32a or the like is positioned low. Furthermore, because the member upper surface portion 21 of the first floor cross member 20 is positioned lower than the upper end of the front opening 32a, it is possible to prevent the cable 40 from getting caught when inserted, improving the workability of the cable 40 assembly work. The same effect can be achieved when the cable 40 is inserted into the rear opening 33a. It should be noted that the cable 40 is easier to insert if it has a certain hardness, such as a fuel lid cable containing a wire, but this is not limited to this.

In addition, in this embodiment, the opening area of the front opening 32a is set larger than the opening area of the rear opening 33a. As a result, by inserting the cable 40 into the front opening 32a between the first floor cross member 20 and the outer seat bracket 30, it is possible to adjust the insertion direction while abutting against the edge of the front opening 32a.

On the other hand, the rear opening 33a may be set larger than the front opening 32a. In this case, rigidity in the vehicle width direction is improved in the event of a pole collision, improving collision performance. For example, if a protected item such as a precision device (e.g., a battery device 55) is installed between the first floor cross member 20 and the second floor cross member 29 (described below), the amount of intrusion of the colliding object (e.g., a pole) can be reduced.

In addition, in this embodiment, the upper end of the first floor cross member 20 is located lower in the vehicle than the upper end of the front opening 32a. Furthermore, the upper end of the rear opening 33a is located lower in the vehicle than the upper end of the front opening 32a, and is located higher in the vehicle than the upper end of the first floor cross member 20.

In addition, in this embodiment, the position where the first floor cross member 20 is joined to the floor panel 1 and the side sill 15 is located further forward in the vehicle than the position where the outer seat bracket 30 is joined to the side sill 15, and the joining area where the front opening 32a is joined to the floor panel 1 and the side sill 15 is set larger than the joining area of the rear opening 33a.

Now, we will explain the inner seat bracket 38. The inner seat bracket 38 is positioned on the vehicle widthwise inner side of the first floor cross member 20, and in this example, is attached to the tunnel side wall 12. The upper surface of the inner seat bracket 38 is provided with through holes for installing seat rails, etc. In addition, flanges are provided on the front and rear walls of the inner seat bracket 38, and these flanges are joined to the tunnel side wall 12 by spot welding, etc.

The floor structure of this embodiment also includes floor side members 14, as described above. The floor side members 14 are located on the outer side of the underside of the floor panel 1 in the vehicle width direction, and extend at an inward angle in the vehicle width direction toward the front of the vehicle (Figure 3). The floor side members 14 extend at an incline from the rear ends of the side sills 15 as described above, and are positioned so as to cross the first floor cross member 20. The floor side members 14 in this example also have a hat-shaped cross section, and flanges are provided on both sides. These flanges are joined to the underside of the floor panel 1 by spot welding or the like.

The floor side member 14, first floor cross member 20, and outer seat bracket 30 are arranged to overlap in the vertical direction of the vehicle. In this example, as shown in FIG. 3, the floor side member 14 is arranged to overlap the lower step portion 23g of the front lower member flange portion 23 of the first floor cross member 20. The outer seat bracket 30 is joined to the side sill 15 as described above.

As described above, the floor structure of this embodiment also includes a second floor cross member 29. As shown in FIG. 3, the second floor cross member 29 is positioned at a distance from the first floor cross member 20 toward the front of the vehicle, and is joined to the floor panel 1. In this example, the vertical dimension of the first floor cross member 20 is set smaller than the vertical dimension of the second floor cross member 29.

In addition, the front and rear surfaces of the first floor cross member 20 are inclined so that they approach each other as they move from the floor panel 1 toward the member upper surface 21. In this example, the front inclined wall portion 22a of the member front portion 22 and the rear inclined wall portion 25a of the member rear portion 25 are inclined so that they approach each other as they move toward the member upper surface 21.

In contrast, the front and rear surfaces of the second floor cross member 29 extend almost perpendicular to the floor panel 1. In this example, the front and rear surfaces are slightly inclined so that they approach each other toward the top. In other words, the front and rear surfaces of the first floor cross member 20 are gently inclined relative to the front and rear surfaces of the second floor cross member 29.

In addition, in this embodiment, a battery device 55 is installed on the upper surface of the floor panel 1, which is located between the first floor cross member 20 and the second floor cross member 29. The exterior of the battery device 55 is roughly rectangular, and the outer portion of the battery device 55 in the vehicle width direction is located above the floor side member 14.

In addition, in this embodiment, the inner end (other end) of the first floor cross member 20 in the vehicle width direction is positioned so as to overlap a gusset (not shown) provided on the back side (underside) of the floor panel 1 when viewed from above. The gusset in this example is provided on the back side of the floor tunnel 10 and reinforces the floor tunnel 10.

The description of this embodiment is merely an example for explaining the present invention and does not limit the invention described in the claims. Furthermore, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims.

In this embodiment, the front opening 32a is formed by cutting out the outer side and lower portion of the bracket front wall portion 32 in the vehicle width direction, has a curved shape, and extends to the side sill 15, but this is not limited to this. The lower end of the bracket front wall portion 32 may also be cut out in a U-shape. The rear opening 33a may also be formed in a similar manner.

1 Floor panel 2 Dash panel 10 Floor tunnel 11 Tunnel upper surface portion 12 Tunnel side wall portion 14 Floor side member 15 Side sill 16 Inner member 16a Inner wall portion 16b Upper surface portion 16c Flange portion 17 Corner portion 20 First floor cross member (cross member)
21 Member upper surface portion 21a Straight portion 21b Forward/backward bead portion 21c Widthwise inner bead portion 21d Widthwise outer bead portion 21e Spreading surface portion 22 Member front portion 22a Front inclined wall portion 22b Front vertical wall portion 22c Spreading wall portion 23 Front lower member flange portion 23e Step 23f Upper step portion 23g Lower step portion 24a Front inner member flange portion 24b Front outer member flange portion 25 Member rear portion 25a Rear inclined wall portion 25b Rear vertical wall portion 25c Spreading wall portion 26 Rear lower member flange portion 27a Rear inner member flange portion 27b Rear outer member flange portion 29 Second floor cross member 30 Outer seat bracket (bracket)
31 Bracket upper surface portion 32 Bracket front wall portion 32a Front opening 32b Front bracket flange portion 32c Front outer bracket flange portion 33 Bracket rear wall portion 33a Rear opening 33b Rear bracket flange portion 33c Rear outer bracket flange portion 34 Bracket inner wall portion 34a Inner bracket flange portion 35 Bracket outer wall portion 35a Upper outer bracket flange portion 38 Inner seat bracket 40 Cable 55 Battery device

Claims (4)

A vehicle floor structure including: a floor panel disposed on a floor portion of a vehicle body; a side sill disposed on the outer side of the floor panel in the vehicle width direction and extending in the front-rear direction of the vehicle; and a cable routed on the upper side of the outer side of the floor panel in the vehicle width direction and on the inner side of the side sill,
A cross member extending in the vehicle width direction is provided on the upper surface of the floor panel, and an end of the cross member is joined to the side sill,
The cross member has a convex cross section that protrudes upward from the vehicle,
a bracket is provided at an end of the cross member in the vehicle width direction, a front wall portion of the bracket is provided with a front opening, and a rear wall portion of the bracket is provided with a rear opening, the front opening and the rear opening being arranged to overlap the convex shape when viewed in the vehicle front-rear direction;
an upper surface portion having a linear portion extending in the vehicle width direction and disposed on the floor panel at a distance; the upper surface portion being disposed lower than upper ends of the opening edges of the front opening and the rear opening; the cable being disposed along the upper surface portion of the convex shape and passing through the front opening and the rear opening ;
inclined wall portions are formed on the front and rear portions constituting the convex shape so as to approach each other as they extend upward on the vehicle, and the inclination angles of the inclined wall portions of the front and rear portions are set smaller than the inclination angles of the front wall portion and the rear wall portion of the bracket,
a lower end of the inclined wall portion located outward in the vehicle width direction from an inner side wall of the bracket in the vehicle width direction is farther away from an upper end of the inclined wall portion than a lower end of the inclined wall portion located inward in the vehicle width direction from the side wall,
A vehicle floor structure, characterized in that a vertical wall extending in the vehicle width direction is formed on the vehicle width inner side of the inclined wall portion located on the vehicle width outer side . The bracket located on the outer side in the vehicle width direction is joined to the side sill,
2. The vehicle floor structure according to claim 1, wherein the outer edges of the front opening and the rear opening in the vehicle width direction face the side sill. 2. A vehicle floor structure as described in claim 1, characterized in that the lower end of the inclined wall portion located at the vehicle widthwise end of the cross member is farther away from the upper end of the inclined wall portion than the lower end of the inclined wall portion at the vehicle widthwise middle portion of the cross member . 4. The vehicle floor structure according to claim 1, wherein a lower portion of the bracket is joined to the floor panel.