JP6501002B2 - Vehicle frame structure - Google Patents

Description

  The present invention relates to a vehicle frame structure.

  For example, Patent Document 1 below discloses a technology in which a floor frame is provided between a rocker under a floor panel and a tunnel. The floor frame is inclined outward in the vehicle width direction as it goes rearward in the longitudinal direction of the vehicle, and the front end of the floor frame is connected (joined) to the rear end of the front side frame, and the rear end of the floor frame Is connected to the front end of the rear side frame. The rear side frame is connected to the side sill (rocker) on the front side of the rear side frame in the vehicle width direction, and the inside of the front side of the rear side frame in the vehicle width direction is connected to the cross member along the vehicle width direction It is done. Thus, for example, at the time of a frontal collision of a vehicle (at the time of a frontal collision of a vehicle), the collision load input from the front frame can be directly transmitted to the rear side frame via the floor frame. .

JP, 2012-11857, A

  However, in recent years, since the vehicle is required to have higher rigidity against the collision load input along the vehicle front-rear direction, the above prior art has room for further improvement.

  An object of the present invention is to obtain a vehicle frame structure capable of obtaining higher rigidity with respect to a collision load input from the front side of the vehicle in consideration of the above-mentioned facts.

The vehicle frame structure according to the present invention described in the first aspect is a tunnel which is disposed at a central portion in a vehicle width direction of a floor panel of the vehicle and extends in a vehicle longitudinal direction, and an outer side of the floor panel And a pair of rockers extending in the longitudinal direction of the vehicle, and a floor cross member having a closed cross-sectional structure, coupled to the rear end of the tunnel, and disposed along the vehicle width direction And a closed cross-sectional structure, disposed between the rocker and the tunnel along the longitudinal direction of the vehicle, and a front end portion in the longitudinal direction of the vehicle is between the rocker and the tunnel in the vehicle width direction at the front of the vehicle the coupled to a front side member disposed along the longitudinal direction of the vehicle, the rear end of the vehicle longitudinal direction and a floor frame coupled to the rocker and the floor cross member, the Furoaku Sumenba is configured to include a floor on the cross-member constituting the upper vertical direction of the vehicle, and the floor under the cross member that constitutes the bottom of the vehicle vertical direction.

  In the vehicle frame structure of the present invention described in claim 1, a tunnel extended in the longitudinal direction of the vehicle is disposed at the central portion in the vehicle width direction of the floor panel of the vehicle. Further, a pair of rockers extending in the vehicle longitudinal direction is disposed on the outer side in the vehicle width direction of the floor panel.

  Here, a floor cross member having a closed cross-sectional structure and disposed along the vehicle width direction is coupled to the rear end portion of the tunnel. In addition, a floor frame having a closed cross-section is disposed between the rocker and the tunnel along the longitudinal direction of the vehicle. On the other hand, front side members are disposed along the longitudinal direction of the vehicle between the rocker and the tunnel in the vehicle width direction at the front of the vehicle. The front end of the floor frame in the front-rear direction of the vehicle is connected to the front side member, and the rear end in the front-rear direction of the vehicle is connected to the rocker and the floor cross member.

This further improves the strength and rigidity of the so-called frame members such as the floor cross member, the floor frame and the rocker. As a result, the strength and rigidity of the floor panel itself can be further improved.
Further, in the present invention, the floor cross member is configured to include the floor upper cross member that constitutes the upper part in the vehicle vertical direction and the floor lower cross member that constitutes the lower part in the vehicle vertical direction. And in the said floor cross member, a closed cross-section structure is formed including the cross member on a floor, and the cross member below a floor.

  According to a second aspect of the present invention, there is provided a vehicle frame structure according to the first aspect of the present invention, wherein the vehicle frame structure has a closed cross-sectional structure and is disposed outside the vehicle rear in the vehicle width direction. A rear side member extending in the front-rear direction is provided, and a front portion in the vehicle longitudinal direction of the rear side member and a rear portion in the vehicle longitudinal direction of the floor frame are disposed at the same position in the vehicle width direction.

  In the vehicle frame structure according to the second aspect of the present invention, the rear side member having a closed cross-sectional structure extends in the vehicle longitudinal direction on the outer side in the vehicle width direction of the rear portion of the vehicle. The front portion of the rear side member in the longitudinal direction of the vehicle and the rear portion of the floor frame in the longitudinal direction of the vehicle are disposed at the same position in the vehicle width direction.

  As described above, when the front portion of the rear side member and the rear portion of the floor frame are arranged at the same position in the vehicle width direction, the collision load transmitted from the floor frame can be transmitted (distributed) to the rear side member. Further, the collision load transmitted from the rear side member can be transmitted to the floor frame. That is, the collision load input to the vehicle can be effectively transmitted along the vehicle longitudinal direction through the floor frame and the rear side member.

  The vehicle frame structure of the present invention described in claim 3 is the vehicle frame structure of the present invention described in claim 1, wherein the floor frame and the rear side member are coupled to the rocker and they are coupled to each other. The floor cross member is coupled to the coupling portion.

  In the vehicle frame structure according to the third aspect of the present invention, the floor frame and the rear side member are coupled to the rocker, and the floor cross member is coupled to the joint where they are coupled to each other. By combining these members in one place, the bonding strength of these members can be increased, and the strength and rigidity can be further improved in these members.

  A vehicle frame structure according to a fourth aspect of the present invention is the vehicle frame structure according to the present invention according to any one of the first to third aspects, wherein a rear side of the floor panel in the vehicle longitudinal direction is A rear floor panel is provided, and the floor cross member is provided between the floor panel and the rear floor panel.

  In the vehicle frame structure of the present invention described in claim 4, the rear floor panel is provided on the rear side of the floor panel in the vehicle longitudinal direction, and a floor cross member is provided between the floor panel and the rear floor panel. There is.

The vehicle frame structure of the present invention described in claim 5 is the vehicle frame structure according to the present invention described in any one of claims 1 to 4 , wherein the floor cross member is the lower surface of the floor panel. It is a cross-under-floor member which forms a 1st closed cross section between them.

In the vehicle frame structure of the present invention described in claim 5 , the floor cross member is a floor lower cross member, and the floor lower cross member forms a first closed cross section with the lower surface of the floor panel. .

A vehicle frame structure according to the present invention described in claim 6 is the vehicle frame structure according to the present invention described in any one of claims 1 to 5 , wherein the floor frame is between the lower surface of the floor panel and the lower surface. Form a second closed cross section.

In the vehicle frame structure of the present invention described in claim 6 , the floor frame forms a second closed cross section with the lower surface of the floor panel.

A vehicle frame structure according to a seventh aspect of the present invention is the vehicle frame structure according to the present invention according to any one of the first to sixth aspects, wherein the vehicle has a closed cross-sectional structure. A rear side member disposed outside and extending in the front-rear direction of the vehicle forms a third closed cross section with the lower surface of the floor panel.

In the vehicle frame structure of the present invention described in claim 7 , the rear side member forms a third closed cross section with the lower surface of the floor panel.

Vehicle frame structure of the present invention according to claim 8, in the vehicle skeleton structure of the present invention described in any one of claims 1 to 7, it is a closed cross section, of the rear portion of the vehicle in the vehicle width direction A rear side member disposed outside and extending in the vehicle longitudinal direction, a joint portion where the floor frame and the rocker are coupled, and the floor cross member overlap in a side view of the vehicle.

In the vehicle frame structure according to the present invention as set forth in claim 8 , the joint portion to which the rear side member, the floor frame and the rocker are coupled and the floor cross member overlap in a vehicle side view.

The vehicle frame structure of the present invention described in claim 9 is the vehicle frame structure according to the present invention described in any one of claims 1 to 8 , comprising a front portion in the vehicle longitudinal direction of the floor frame and the rocker And the floor frame is disposed to be inclined toward the outside in the vehicle width direction toward the rear side in the vehicle longitudinal direction in a bottom view. ing.

According to a ninth aspect of the present invention, the vehicle frame structure further includes a cross member which is connected to a front portion of the floor frame in the front-rear direction of the vehicle and a rocker and disposed along the vehicle width direction. The floor frame is disposed to be inclined outward in the vehicle width direction as it goes to the rear side in the vehicle longitudinal direction. As a result, a frame portion having a so-called triangular truss structure is formed between the cross member, the floor frame, and the rocker in a bottom view, and the rigidity of the floor panel itself can be further improved.

The vehicle frame structure of the present invention described in claim 10 is the vehicle frame structure of the present invention described in any one of claims 1 to 9 , wherein in a side view, the floor panel is in the longitudinal direction of the vehicle It is inclined and formed toward the upper side in the vehicle vertical direction from the front side of the rocker in the vehicle longitudinal direction toward the floor cross member side.

According to the vehicle frame structure of the present invention described in claim 10 , in the floor panel, on the floor cross member side, the distance from the contact point of the tire can be increased. Thereby, the dimension of the height direction can be increased in the 2nd closed cross section part formed between a floor frame and the undersurface of a floor panel.

The vehicle frame structure of the present invention described in claim 11 is the vehicle frame structure according to the present invention described in claim 5 , wherein the floor panel is opposed to the underfloor cross member in the middle and the upper surface of the floor panel And a fourth closed cross section overlapping the first closed cross section of the floor lower cross member in the vehicle vertical direction, and connected to each of the pair of rockers and disposed along the vehicle width direction. It further has a cross member on the floor.

In the vehicle frame structure of the present invention described in claim 11 , the floor panel further includes a floor upper cross member facing the floor lower cross member between the floor panels. The cross member on the floor is coupled to each of the pair of rockers and disposed along the vehicle width direction. In addition, the floor upper cross member forms a fourth closed cross section between the upper surface of the floor panel and the first closed cross section formed between the lower surface of the floor panel and the lower floor cross member and the vehicle. Overlapping in the vertical direction.

  Thus, in the on-floor cross member coupled to each of the pair of rockers, a fourth closed cross section is formed between the floor panel and the floor panel, and the floor panel is interposed between the floor panel and the first floor panel. The rigidity of the floor panel itself can be improved by arranging the under floor cross member forming the closed cross section and the upper and lower sides of the vehicle.

The vehicle frame structure of the present invention described in claim 12 is the vehicle frame structure of the present invention described in any one of claims 1 to 11 , wherein a vehicle is provided at a rear portion in the vehicle longitudinal direction of the floor frame. A wide portion is formed in which the width dimension along the width direction is wider than the other portions of the floor frame in the vehicle longitudinal direction, and the outer flange portion formed at the outer end in the vehicle width direction of the wide portion is the rocker And a rear flange portion formed at a rear end of the widening portion in the vehicle longitudinal direction is connected to the floor cross member.

In the vehicle frame structure of the present invention described in claim 12 , the width dimension along the vehicle width direction at the rear portion of the floor frame in the vehicle longitudinal direction is wider than the other portions in the vehicle longitudinal direction of the floor frame. The part is formed. Therefore, it is possible to further disperse the impact load input to the front portion of the floor frame by the amount of the expansion in the floor frame, and to improve the load transfer efficiency.

  Further, an outer flange portion formed at an outer end in the vehicle width direction of the widening portion is coupled to the rocker, and a rear flange portion formed at a rear end in the vehicle longitudinal direction of the widening portion is coupled to the floor cross member. By forming a portion (flange portion) to be coupled with the rocker and the floor cross member in the widening portion in the floor frame, it is possible to increase the coupling area with the rocker and the floor cross member. And the connection force with a floor frame, a rocker, and a floor cross member can be strengthened by that much.

  As described above, the vehicle frame structure according to the present invention has an excellent effect that higher rigidity can be obtained with respect to a collision load input to the vehicle from the vehicle front side.

It is a bottom view showing the vehicle frame structure concerning this embodiment. It is the perspective view seen from the diagonal right rear side of the vehicle bottom side which shows the structure by the side of the front of the vehicle front-back direction of the vehicle frame structure which concerns on this Embodiment. It is the perspective view seen from the diagonal right rear side of the vehicle bottom side which shows the structure of the rear side of the vehicle front-back direction of the vehicle frame structure which concerns on this Embodiment. FIG. 2 is a partially enlarged plan view enlarging a main part of the vehicle frame structure according to the present embodiment. (A) is a cross-sectional view taken along the line A-A in FIG. 1, and (B) is a cross-sectional view taken along the line B-B in FIG. 1. It is sectional drawing along the extension direction of the floor frame which shows the modification of the vehicle frame structure which concerns on this Embodiment. (A), (B) is an explanatory view showing an operation of a vehicle frame structure concerning this embodiment. It is a bottom view corresponding to Drawing 1 showing the modification of the vehicle skeleton structure concerning this embodiment.

  A vehicle frame structure according to an embodiment of the present invention will be described based on the drawings. In addition, arrow FR, arrow UP, arrow RH, and arrow LH appropriately described in the respective drawings are respectively forward, upward, rightward, and left of the vehicle to which the vehicle frame structure 10 according to the embodiment of the present invention is applied. Indicates the direction. In the following description, when simply using front and rear, upper and lower, and left and right directions, unless otherwise noted, the left and the right in the front and rear directions of the vehicle front and rear, up and down in the vehicle vertical direction, and the front direction are indicated.

(Structure of vehicle frame structure)
First, the configuration of the vehicle frame structure according to the present embodiment will be described.

  As shown in FIG. 1, a vehicle (vehicle body) 12 to which a vehicle skeleton structure 10 according to the present embodiment is applied is shown. In general, a power unit room 16 is provided in a vehicle front portion 14 of the vehicle 12, and the power unit room 16 is partitioned from a passenger compartment 20 (see FIG. 6) by a dash panel 18. As shown in FIG. 6, the dash panel 18 is formed such that its upper part 18A is formed along the vehicle vertical direction, and the lower part 18B is formed to be inclined downward as it goes to the rear side.

  Although not shown, the lower end of the dash panel 18 is connected to the front end of the floor panel 22 that constitutes the floor of the passenger compartment 20, and the dash panel 18 and the floor panel 22 are integrated. The bonding in the present embodiment also includes the following description, and examples include welding by spot welding and the like. Also, the dash panel 18 and the floor panel 22 may be integrally formed.

  As shown in FIG. 1, rockers 24 extend along the vehicle front-rear direction on both sides of the floor panel 22 in the vehicle width direction. The rocker 24 includes a rocker outer panel 26 disposed on the outer side in the vehicle width direction and a rocker panel 28 disposed on the inner side in the vehicle width direction.

  Further, as shown in FIG. 5A, the cross-sectional shapes of the rocker outer panel 26 and the rocker panel 28 when cut along the vehicle width direction are substantially hat-like with the sides facing each other being open. The rocker outer panel 26 and the rocker panel 28 are provided on upper and lower portions of the side wall 24A and the side wall 24A arranged along the vehicle vertical direction, respectively, an upper wall 24B and a lower wall 24C arranged along the vehicle width direction. Is equipped.

  Further, as shown in FIG. 1, the floor panel 22 is divided at the left and right of the vehicle 12 and is configured by a pair of floor panels 30. A tunnel 32 extends along the longitudinal direction of the vehicle at a central portion in the vehicle width direction of the floor panel 22 (between the floor panel 30 and the floor panel 30).

  The tunnel 32 has a substantially hat shape whose cross-sectional shape when cut along the vehicle width direction opens downward, and the upper wall 32A and a pair of side walls located on the left and right of the upper wall 32A. It is equipped with 32B. The lower end of the side wall portion 32B is coupled to the floor panel 22. Thereby, the floor panel 22 and the tunnel 32 are integrated. The floor panel 22 and the tunnel 32 may be integrally formed.

  Further, the tunnel 32 has a shorter length in the vehicle longitudinal direction than the rocker 24, and the rear end 33 of the tunnel 32 is located on the front side of the rear end 27 of the rocker 24. As shown in FIGS. 1 and 6, a cross member on the floor (floor cross member) 34 disposed along the vehicle width direction is coupled to the rear end portion 33 of the tunnel 32.

  The floor upper cross member 34 has a so-called substantially hat shape whose cross-sectional shape along the vehicle longitudinal direction has an opening on the lower side. Further, the floor upper cross member 34 includes an upper wall portion 34A disposed to face the upper surface 22A of the floor panel 22, and a front wall portion 34B and a rear wall portion 34C which are connected to the upper wall portion 34A and face each other. .

  The front wall 34 B of the floor cross member 34 is coupled to the rear end 33 of the tunnel 32. Further, both ends in the vehicle width direction of the on-floor cross member 34 are coupled to the pair of rockers 24 respectively. Further, lower ends of the front wall portion 34B and the rear wall portion 34C of the floor upper cross member 34 are coupled to the upper surface 22A of the floor panel 22. In this state, a closed cross section (fourth closed cross section) 36 is formed between the floor panel 22 and the floor cross member 34.

  Further, as shown in FIG. 1, on the rear side of the floor upper cross member 34, a rear floor panel 38 extending in the vehicle width direction and the vehicle longitudinal direction is provided. The rear floor panel 38 constitutes a part of the floor panel 22. The rear floor panel 38 and the floor panel 22 may be integrally formed or may be integrated by being coupled to each other.

  On the other hand, a pair of front side members 40 are disposed on the outer side in the vehicle width direction of the power unit room 16 of the vehicle front portion 14, that is, between the rocker 24 and the tunnel 32 in the vehicle width direction. Each of the front side members 40 extends in the longitudinal direction of the vehicle, and has a substantially rectangular cross section when cut in the width direction of the vehicle.

  Then, as shown in FIG. 6, the front side member 40 is coupled to the front surface 18A1 of the upper portion 18A of the dash panel 18 and inclined along the shape of the lower portion 18B of the dash panel 18. It extends to the lower surface 22B side. Hereinafter, a portion of the front side member 40 to the front surface 18C of the dash panel 18 is referred to as a front side member 40, and a portion on the rear side of the front surface 18C of the dash panel 18 is referred to as a floor frame 42.

  As shown in FIGS. 5A and 5B, the floor frame 42 has a substantially hat-like cross-sectional shape along the vehicle width direction with the upper side as an opening, and the lower surface 22B of the floor panel 22 And a pair of side wall portions 42B and 42C connected to the lower wall portion 42A and opposed to each other. Of the pair of side wall portions 42B and 42C, the wall portion disposed on the tunnel 32 side is referred to as an inner wall portion 42B, and the wall portion disposed on the rocker 24 side is referred to as an outer wall portion 42C. The upper ends of the inner wall portion 42B and the outer wall portion 42C are respectively coupled to the lower surface 22B of the floor panel 22. In this state, a closed cross section (second closed cross section) 44 is formed between the floor frame 42 and the floor panel 22.

  Here, as shown in FIG. 1 and FIG. 6, the lower surface 22B of the floor panel 22 is opposed to the floor upper cross member 34 with the floor panel 22 therebetween, and the floor lower cross member (floor Cross member) 46 is coupled. The lower floor cross member 46 has a substantially inverted hat shape whose cross-sectional shape along the longitudinal direction of the vehicle has an opening on the upper side, and the lower wall portion 46A disposed to face the lower surface 22B of the floor panel 22. And a front wall 46B and a rear wall 46C that are connected to the lower wall 46A and face each other.

  Then, both end portions in the vehicle width direction of the floor lower cross member 46 are coupled to the pair of rockers 24 respectively. Further, the upper ends of the front wall portion 46B and the rear wall portion 46C of the floor lower cross member 46 are coupled to the lower surface 22B of the floor panel 22. In this state, a closed cross section (first closed cross section) 48 is formed between the floor lower cross member 46 and the floor panel 22, and the closed cross section 48 is a closed cross section of the floor upper cross member 34. The floor panel 36 and the floor panel 22 overlap vertically.

  Further, as shown in FIG. 1, the floor frame 42 is inclined toward the outside in the vehicle width direction as it goes to the rear side in a bottom view. The front portion 43 (floor side of the floor frame 42) of the floor frame 42 located on the front portion 23 of the floor panel 22 (the dash panel 18 side of the floor panel 22) is a cross member along the vehicle width direction Torque box 50 is coupled.

  As shown in FIG. 2, the torque box 50 has a substantially inverted hat shape whose cross-sectional shape along the vehicle longitudinal direction has an opening on the upper side, and is disposed to face the lower surface 22 B of the floor panel 22. The lower wall portion 50A and the front wall portion 50B and the rear wall portion 50C which are connected to the lower wall portion 50A and face each other are provided.

  Upper ends of the front wall portion 50B and the rear wall portion 50C are coupled to the lower surface 22B of the floor panel 22, and a closed cross-sectional portion 52 is formed between the torque box 50 and the floor panel 22. A flange 50D formed at one end of the torque box 50 in the vehicle width direction is connected to the lower wall 24C and the side wall 24A of the floor frame 42, and is formed at the other end of the torque box 50 in the vehicle width direction. The flange portion 50E is connected to the lower wall portion 24C and the side wall portion 24A of the rocker panel 28 of the rocker 24.

  On the other hand, as shown in FIGS. 1 and 3, the rear 45 of the floor frame 42 is coupled to the rocker 24 and the underfloor cross member 46. Specifically, in the rear portion 45 of the floor frame 42, the width dimension W of the lower wall portion 42A along the vehicle width direction is greater than the width dimension W0 of the general portion (another portion in the vehicle longitudinal direction of the floor frame) 53 It is considered as a widened portion 54 which is widened. Further, the outer side in the vehicle width direction of the wide portion 54 is formed to be substantially parallel to the rocker 24. Furthermore, the outer wall portion 42C on the rocker 24 side is not provided in the widening portion 54, and the outer flange portion 54A extends from the lower wall portion 42A toward the outer side in the vehicle width direction. The outer flange portion 54A is connected to the lower wall portion 24C of the rocker panel 28 of the rocker 24.

  Further, an outer flange portion 42C of the general portion 53 of the floor frame 42 is connected to the front portion 55 of the wide portion 54, and an outer flange portion 54B (see FIG. 5B) is formed at the rear portion of the outer wall portion 42C. It is connected to the side wall 24A of the rocker panel 28. Further, a rear flange portion 54C is extended from the rear end of the widening portion 54, and is connected to the lower wall portion 46A and the front wall portion 46B of the underfloor cross member 46, respectively.

  Further, as described above, the rear floor panel 38 is provided on the rear side of the underfloor cross member 46. A pair of rear side members 60 are disposed on the outer side in the vehicle width direction of the rear floor panel 38 along the longitudinal direction of the vehicle. The rear side member 60 has a so-called substantially inverted hat shape in which the cross-sectional shape along the vehicle width direction has an opening on the upper side, and the lower wall portion 60A disposed to face the lower surface 38A of the rear floor panel 38 It has a pair of side wall portions 60B and 60C that are connected to the lower wall portion 60A and face each other.

  Among the pair of side wall portions 60B and 60C, the wall portion disposed on the tunnel 32 side is referred to as an inner wall portion 60B, and the wall portion disposed on the rocker 24 side is referred to as an outer wall portion 60C. The upper ends of the inner wall 60B and the outer wall 60C are coupled to the lower surface 22B of the floor panel 22, respectively. In this state, a closed cross section (third closed cross section) 62 is formed between the rear side member 60 and the floor panel 22.

  Further, the front portion 63 side of the rear side member 60 is a wide portion 66 in which the width W along the vehicle width direction of the lower wall portion 60A is wider than the general portion 64. The outer side of the wide portion 66 in the vehicle width direction is formed to be substantially parallel to the rocker 24. Further, the side wall portion 60B on the rocker 24 side is not provided in the widening portion 66, and the outer flange portion 66A extends from the lower wall portion 60A toward the outer side in the vehicle width direction. The outer flange portion 66A is connected to the lower wall portion 24C of the rocker panel 28 of the rocker 24. A front flange portion 66B extends from the front end of the wide portion 66, and the front flange portion 66B is coupled to the lower wall portion 46A and the rear wall portion 46C of the floor lower cross member 46, respectively.

  In this state, the wide portion 54 of the floor frame 42 and the wide portion 66 of the rear side member 60 are disposed at the same position in the vehicle width direction. In other words, the wide portion 54 of the floor frame 42 and the wide portion 66 of the rear side member 60 are disposed along the vehicle longitudinal direction with the under floor cross member 46 therebetween. Here, the “same position” may be disposed so that at least a part of the wide portion 66 of the rear side member 60 and the wide portion 54 of the floor frame 42 wrap in the vehicle width direction.

(Function and effect of vehicle frame structure)
Next, the operation and effects of the vehicle frame structure according to the present embodiment will be described.

  As shown in FIG. 1, in the present embodiment, the floor lower cross member 46 disposed along the vehicle width direction on the rear end 33 side of the tunnel 32 has a pair of rockers 24 between the floor panels 22. Are disposed opposite to the floor cross members 34 (see FIG. 6) respectively coupled thereto. The floor upper cross member 34 forms a closed cross section 36 (see FIG. 6) with the upper surface 22 A of the floor panel 22, and the floor lower cross member 46 forms a closed cross section with the lower surface 22 B of the floor panel 22. The portion 48 (see FIG. 6) is formed.

  In this manner, the upper floor cross member 34 and the lower floor cross member 46 are compared with the case where the closed cross section 36, 48 is not formed by forming the closed cross section 36, 48 with the floor panel 22, respectively. Thus, the rigidity of the on-floor cross member 34 and the on-floor cross member 46 itself can be improved. The rigidity of the floor upper cross member 34 and the floor lower cross member 46 can be further improved by the floor lower cross member 46 and the floor upper cross member 34 vertically overlapping each other with the floor panel 22 therebetween.

  Further, in the present embodiment, a floor frame 42 forming a closed cross-sectional portion 44 between the floor panel 22 and the lower surface 22B of the floor panel 22 is disposed between the rocker 24 and the tunnel 32 in the vehicle longitudinal direction. It is done. The front 43 of the floor frame 42 is coupled to the front side member 40, and the rear 45 of the floor frame 42 is coupled to the rocker 24 and the underfloor cross member 46.

  Furthermore, in the present embodiment, the widening portion 54 formed on the rear portion 45 of the floor frame 42 and the widening portion 66 formed on the front portion 63 of the rear side member 60 are disposed at the same position in the vehicle width direction. The widening portion 66 of the rear side member 60 is coupled to the rocker 24 and the underfloor cross member 46. That is, in the present embodiment, the rocker 24, the floor frame 42, the underfloor cross member 46, and the rear side member 60 are coupled to each other at the same location (coupling portion 70).

  Thereby, as shown in FIG. 1, according to the present embodiment, the collision load input to the front side member 40 is applied to the floor frame 42 with respect to the collision load F input to the vehicle 12 from the vehicle front side. Transmitted (load; F1). In the front portion 43 of the floor frame 42, the collision load F1 is dispersed to the rocker 24 through the torque box 50 (load: F2).

  Then, as shown in FIG. 7A, these loads are transmitted to the joint portion 70, but in the joint portion 70, reaction forces from the under floor cross member 46, the rear side member 60 and the rear portion 71 of the rocker 24. (N1, N2, N3 respectively) can be obtained. As shown in FIG. 7B, the floor frame 42, the floor lower cross member 46, and the rear side member 60 are provided at the joint portion 70 with respect to the collision load f input to the vehicle 12 from the side of the vehicle. Reaction forces (N4, N5, N6, respectively) can be obtained.

  In this manner, by connecting the so-called frame members such as the floor frame 42, the rocker 24, the underfloor cross member 46 and the rear side member 60 at one point of the connecting portion 70, the connecting force of these members is increased. The strength and the rigidity can be further improved in the member. As a result, the rigidity of the floor panel 22 itself can be improved.

  That is, according to the present embodiment, higher rigidity can be obtained with respect to a collision load input to the vehicle 12 from the vehicle front side. For example, as shown in FIG. 1, at the time of a front collision of the vehicle 12, a collision load F input to the front side member 40 is transmitted to the floor frame 42 (load: F1). The floor frame 42 is coupled to the rocker 24 and the underfloor cross member 46. For this reason, the load F1 transmitted to the floor frame 42 is the rear side member 60 (load) via the rocker 24 (load; F2, F3), the floor lower cross member 46 (load; F4), and the floor lower cross member 46. It will be transmitted to F5).

  That is, according to the present embodiment, the collision load F can be effectively transmitted along the vehicle longitudinal direction via the floor frame 42 and the rear side member 60. Furthermore, in the present embodiment, in the joint portion 70, the rear side member 60 is provided with the widening part 66, and the floor frame 42 is provided with the widening part 54.

  Thus, by providing the widened portions 54, 66 in the floor frame 42, a coupling for coupling with the rocker 24 and the underfloor cross member 46 as compared with the case where the widened portions 54, 66 are not provided. The area (for example, the outer flange portion 54A and the rear flange portion 54C shown in FIG. 3) can be increased. Therefore, the coupling force between the floor frame 42, the rear side member 60, and the rocker 24 and the under floor cross member 46 is strengthened. Further, by providing the wide portions 54 and 66 on the floor frame 42 and the rear side member 60, the impact load input to the floor frame 42 or the rear side member 60 is further dispersed by the amount of the widening, and the load transfer efficiency is improved. be able to.

  Further, in the present embodiment, the front portion 43 of the floor frame 42 is coupled to the front portion 25 of the rocker 24 via the torque box 50, and the rear portion 45 of the floor frame 42 is the rocker 24 and the underfloor cross member 46. Combined with That is, the frame portion 72 having a so-called truss structure is formed on both sides of the floor panel 22 in the vehicle width direction in a bottom view by the floor frame 42, the torque box 50, and the rocker 24. Thus, the rigidity of the floor panel 22 itself can be further improved, and the so-called load transfer efficiency can be improved.

(Modification of this embodiment)
In general, the height of the floor of the vehicle varies depending on the type of vehicle. For example, a sedan-based vehicle (low floor) has a lower floor height than a SUV (Sport Utility Vehicle) vehicle (in-floor). Also, in general, the front of the floor panel is inclined upward toward the front of the floor panel, and the rear of the floor panel is lower than the front of the floor panel. For this reason, in the case of a low floor vehicle, when the frame member is disposed below the floor panel, the height in the vehicle vertical direction is sufficiently secured on the rear side in the vehicle longitudinal direction as compared to the mid floor vehicle. It may not be possible.

  Therefore, in the present embodiment, as shown in FIG. 6, the floor panel 22 may be inclined upward as it goes from the front 25 side of the rocker 24 to the under floor cross member 46 side. . Thereby, on the floor lower cross member 46 side of the floor panel 22, the distance from the contact point of the tire can be increased.

  Therefore, as shown in FIGS. 5A and 5B, the dimensions in the height direction of the inner wall 42B and the outer wall 42C of the floor frame 42 can be increased on the underfloor cross member 46 side of the rocker 24. . That is, the dimension of the closed cross-sectional portion 48 in the height direction can be increased, whereby the rigidity of the floor frame 42 can be improved and the deformation of the floor frame 42 can be suppressed.

  When the joint force between the floor frame 42 and the rocker 24 is sufficiently secured in the joint portion 70 (see FIG. 1), the floor panel cross section 34 on the floor does not necessarily have to be inclined.

  Further, by increasing the dimension in the height direction of the inner wall portion 42B and the outer wall portion 42C of the floor frame 42, the length in the vertical direction of the outer flange portion 54B coupled to the rocker panel 28 of the rocker 24 can be increased. it can. Thereby, the coupling force between the floor frame 42 and the rocker 24 can be further improved.

  Further, as shown in FIG. 6, a reinforcing member 76 (shown by hatching) is disposed between the rear end 47 of the floor frame 42 and the front end 74 of the rear side member 60 in the closed cross section 48 of the floor lower cross member 46. May be provided. Thus, by providing the reinforcing member 76 in the closed cross section 48 of the floor lower cross member 46, the rigidity of the floor lower cross member 46 itself is improved.

  Further, as shown in FIG. 4, the reinforcing member 76 has a substantially hat shape with an opening on the outer side in the vehicle width direction in plan view, and the front wall 76A, the rear wall 76B, and the front wall face each other. It comprises a vertical wall 76C connecting the portion 76A and the inner end in the vehicle width direction of the rear wall 76B. The front wall 76A and the rear wall 76B of the reinforcing member 76 are disposed to abut on the front wall 46B and the rear wall 46C of the floor lower cross member 46, respectively.

  A vertical wall 76C of the reinforcing member 76 is provided between the inner wall 42B of the rear end 47 of the floor frame 42 and the inner wall 60B of the front end 74 of the rear side member 60. That is, in a bottom view, the inner wall 42B of the floor frame 42, the vertical wall 76C of the reinforcing member 76, and the inner wall 60B of the rear side member 60 are continuously formed along the vehicle longitudinal direction.

  Thereby, it is possible to reduce the load transfer loss due to the collision load transmitted along the vehicle longitudinal direction between the floor frame 42 and the rear side member 60. In other words, the load transfer efficiency at the collision load can be improved.

  Even if the reinforcing member 76 is not provided in the closed cross-sectional portion 48 of the floor lower cross member 46, the reinforcing member 76 is not necessarily provided if the rigidity of the floor lower cross member 46 itself is sufficiently ensured. . Therefore, the inner wall 42B of the floor frame 42, the vertical wall 76C of the reinforcing member 76, and the inner wall 60B of the rear side member 60 do not necessarily have to be formed continuously along the longitudinal direction of the vehicle.

(Supplementary explanation of the present embodiment)
In the present embodiment, as shown in FIG. 1, the underfloor cross member 46 is described as being coupled to each of the pair of rockers 24, but at least the rocker 24, the underfloor cross member 46 and the floor frame 42 are described. Is only required to be coupled at one place by the coupling unit 70, and the invention is not limited to this. For example, as shown in FIG. 8, the floor frame 42 and the rear side member 60 may be coupled to the rocker 24 and coupled to each other such that the underfloor cross member 46 may be coupled to the coupled portion 70. Good.

  Further, in the present embodiment, the torque box 50 has been described as an example of the cross member, but it may be disposed in the vehicle width direction and may be coupled to the front portion 43 of the floor frame 42 and the rocker 24 respectively. The present invention is not limited to the torque box 50. Furthermore, here, as described above, since at least the rocker 24, the underfloor cross member 46, and the floor frame 42 may be coupled at one place by the coupling portion 70, the torque box 50 is not necessarily required.

  Further, in the present embodiment, the rocker 24 is configured by one member along the vehicle longitudinal direction, but for example, as shown in FIG. 7B, the rocker 24 in the vehicle longitudinal direction of the coupling portion 70 in the rocker 24 is At the rear, the rocker rear 71 may be coupled as a separate member. That is, in this case, the rocker 71 is integrated with the rocker 24 through the joint 70.

  Furthermore, in the present embodiment, as shown in FIG. 1, the widened portion 66 of the rear side member 60 and the widened portion 54 of the floor frame 42 are disposed at the same position in the vehicle width direction. It does not have to be placed at the same position. Further, in the present embodiment, the widening portion 54 is formed at the rear portion 45 of the floor frame 42, but the widening portion may be provided by connecting another member to the floor frame 42. . Furthermore, the widening portion 54 is not necessarily required. The rear side member 60 is also similar to the floor frame 42.

  Further, in the present embodiment, as shown in FIG. 6, the floor upper cross member 34 forming the closed cross section 36 with the upper surface 22A of the floor panel 22 is disposed along the vehicle width direction. The cross member 34 on the floor is not necessarily required.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to such Embodiment, You may use it combining suitably one Embodiment and various modifications, The summary of this invention Of course, various modifications can be made without departing from the scope of the invention.

10 Vehicle frame structure
12 vehicles
22 floor panels
22A upper surface (upper surface of floor panel)
22B bottom (bottom of floor panel)
24 Rocca
25 front (front of the rocker)
30 floor panels
32 tunnel
33 Rear end (the rear end of the tunnel)
34 floor cross member (floor cross member)
36 closed cross section (4th closed cross section)
38 Rear floor panel (floor panel)
38A bottom (bottom of floor panel)
40 front side member
42 floor frame
44 Closed cross section (second closed cross section)
45 Rear (the rear of the floor frame in the front-rear direction of the vehicle)
46 floor lower cross member (floor cross member)
48 Closed cross section (first closed cross section)
50 torque box (cross member)
53 General part (other part of the floor frame in the front-rear direction of the vehicle)
54 Widening part (the rear part of the floor frame in the longitudinal direction of the vehicle)
54A Outer flange part
54C Rear flange part
60 rear side member
62 Closed cross section (third closed cross section)
63 Front (front of vehicle in front / rear direction of rear side member)
70 Joint
W width dimension

Claims (12)

A tunnel disposed at a central portion in a vehicle width direction of a floor panel of the vehicle and extended in the vehicle longitudinal direction;
A pair of rockers disposed on the outer side in the vehicle width direction of the floor panel and extending in the vehicle longitudinal direction;
A floor cross member having a closed cross-sectional structure, coupled to the rear end of the tunnel, and disposed along the vehicle width direction;
A closed cross-sectional structure is provided along the longitudinal direction of the vehicle between the rocker and the tunnel, and a front end portion in the longitudinal direction of the vehicle is a vehicle between the rocker and the tunnel in the vehicle width direction at the front of the vehicle A floor frame coupled to a front side member disposed along the longitudinal direction, and a rear end portion in the longitudinal direction of the vehicle being coupled to the rocker and the floor cross member;
Equipped with
The floor cross member is
A cross member on the floor that constitutes the upper part in the vertical direction of the vehicle,
An underfloor cross member that constitutes the lower part of the vehicle in the vertical direction,
Vehicle frame structure that is configured to include . The rear side member has a closed cross-sectional structure and is disposed on the outer side in the vehicle width direction at the rear of the vehicle and extends in the vehicle longitudinal direction,
The vehicle frame structure according to claim 1, wherein a front portion in the vehicle longitudinal direction of the rear side member and a rear portion in the vehicle longitudinal direction of the floor frame are disposed at the same position in the vehicle width direction.   The vehicle frame structure according to claim 2, wherein the floor frame and the rear side member are coupled to the rocker, and the floor cross member is coupled to a joint where the floor frame and the rear side member are coupled to each other.   The rear floor panel is provided on the rear side of the floor panel in the vehicle longitudinal direction, and the floor cross member is provided between the floor panel and the rear floor panel. Vehicle frame structure as described in. The vehicle frame structure according to any one of claims 1 to 4, wherein the floor cross member is an under-floor cross member that forms a first closed cross section with the lower surface of the floor panel . The vehicle frame structure according to any one of claims 1 to 5, wherein the floor frame forms a second closed cross section with the lower surface of the floor panel. A rear side member having a closed cross-sectional structure and disposed on the outer side in the vehicle width direction at the rear of the vehicle and extending in the vehicle longitudinal direction forms a third closed cross-sectional portion with the lower surface of the floor panel vehicle frame structure according to any one of claims 1 to 6 which are. The rear cross member has a closed cross-sectional structure and is disposed on the outside in the vehicle width direction at the rear of the vehicle , and a rear side member extended in the vehicle longitudinal direction, the joint portion to which the floor frame and the rocker are coupled, and the floor cross member The vehicle frame structure according to any one of claims 1 to 7, which overlaps in a side view of the vehicle. The vehicle further comprises: a front portion in the vehicle longitudinal direction of the floor frame and a cross member coupled to the rocker and disposed along the vehicle width direction.
The vehicle frame structure according to any one of claims 1 to 8 , wherein in a bottom view, the floor frame is inclined toward the outside in the vehicle width direction as it goes to the rear side in the vehicle longitudinal direction. . In a side view, the floor panel is formed to be inclined upward to the vehicle vertical direction from the front side of the rocker in the vehicle longitudinal direction toward the floor cross member in the vehicle longitudinal direction. The vehicle frame structure according to any one of claims 1 to 9. A fourth closed cross section is formed facing the floor lower cross member between the floor panels and overlapping the first closed cross section of the lower floor cross member with the upper surface of the floor panel. 6. The vehicle frame structure according to claim 5 , further comprising: an on-floor cross member coupled to each of the pair of rockers and disposed along the vehicle width direction . At the rear of the floor frame in the longitudinal direction of the vehicle, a widened portion in which the width dimension along the lateral direction of the vehicle is wider than other portions in the longitudinal direction of the vehicle of the floor frame is formed.
An outer flange portion formed at an outer end of the widening portion in the vehicle width direction is coupled to the rocker, and a rear flange portion formed at a rear end of the widening portion in the vehicle longitudinal direction is coupled to the floor cross member The vehicle frame structure according to any one of claims 1 to 11 .