JP4677881B2 - Vehicle floor structure - Google Patents

Description

  The present invention relates to a floor structure that forms a vehicle bottom, and belongs to the technical field of vehicle body structure.

  On the floor panel that forms the bottom of the vehicle, a cross member that extends in the vehicle width direction and forms a closed cross section with the upper surface of the panel may be provided for the purpose of reinforcing the panel. In addition, an air conditioning duct that guides conditioned air from an air conditioner provided at the front of the vehicle to a rear seat or the like may be laid on the panel.

  Here, when the cross member is provided, for example, between the air conditioner and the rear seat in the longitudinal direction of the vehicle body, it is conceivable that the air conditioning duct passes, for example, above the cross member. For example, the installation position of the seat device or the like to be provided must be increased. Therefore, it is conceivable to form openings at corresponding positions in the vehicle front-rear direction on the vehicle front side and rear side of the cross member, and to insert the air conditioning duct through the openings. However, when the opening is provided in this way, the strength in the vicinity of the opening is reduced, and the side collision resistance is deteriorated such that the cross member is easily deformed around the opening at the time of a side collision.

  In order to deal with this problem, for example, in Patent Document 1, reinforcing beads extending in the vehicle width direction are provided on the floor panel in front and behind the opening, thereby improving the strength around the opening. What has been made is disclosed.

Japanese Patent Laid-Open No. 11-208520

  By the way, the position in the vehicle width direction of the air-conditioning air outlet to the rear seat in the air-conditioning duct is usually set in consideration of the occupant position of the rear seat, the circulation of air-conditioning air to the entire rear seat, etc. The arrangement route is set to be as short as possible without detouring to the air-conditioning air outlet so as to minimize heat dissipation loss on the air-conditioning duct. That is, the appropriate installation position of the air-conditioning duct insertion opening in the cross member is naturally determined from the above-mentioned conditions, but in the case of the one described in Patent Document 1, it is difficult to provide at this position. There is.

  That is, in the thing of patent document 1, although it is necessary to provide the bead for reinforcement according to the opening position decided as mentioned above in the floor panel used as the base of a vehicle body, In addition to the beads, it is necessary to provide various equipment mounting portions, reinforcing structures, and the like, and it may be difficult to provide reinforcing beads by interfering with these. Therefore, in such a case, in the one described in Patent Document 1, the reinforcing bead position on the floor panel is set first, and the opening position of the cross member is set in accordance with the reinforcing bead position. In that case, it becomes difficult to arrange the air-conditioning duct and the air-conditioned air outlet at an appropriate position for the reasons described above. In addition, in the conventional structure, the opening through which the air conditioning duct passes is not directly reinforced, so when a large side impact load is input, stress concentration occurs in the periphery of the opening as a result. Sufficient strength against bumps cannot be obtained. Furthermore, in the conventional structure, since the reinforcing bead extends in the vehicle width direction, the periphery of the bead portion becomes fragile with respect to the front-rear impact load, and the proof strength against the front-rear impact is reduced.

  Therefore, the present invention is provided with a cross member extending in the vehicle width direction and forming a closed cross section with the floor upper surface on the floor forming the vehicle bottom, and the vehicle front side and rear side of the cross member. In a vehicle floor structure in which a notch is provided at a corresponding position in the longitudinal direction of the vehicle body in the vehicle body, it is possible to achieve good side- and anti-front-end collision performance without providing a reinforcing bead on the floor panel, It is an object of the present invention to provide a vehicle floor structure capable of improving the degree of freedom of layout.

  In order to solve the above-described problems, the present invention is configured as follows.

First, the invention according to claim 1 of the present application is provided with a cross member that extends in the vehicle width direction and forms a closed cross section with the top surface of the floor panel on the floor panel that forms the bottom of the vehicle. A vehicle floor structure in which cutouts are provided at corresponding positions in the vehicle front-rear direction on the vehicle front side and rear side of the cross member, with the front and rear ends straddling both cutouts and in contact with the edges. A notch reinforcing member having an open closed cross-sectional structure is provided , and a frame that extends in the longitudinal direction of the vehicle body and forms a closed cross section with the lower surface of the floor panel is provided on the lower surface of the floor panel. The cutout reinforcing member is provided by being overlapped in a plan view and is connected to the frame via a floor panel .

According to a second aspect of the present invention, a cross member that extends in the vehicle width direction and forms a closed cross section with the top surface of the floor panel is provided on the floor panel that forms the bottom of the vehicle. The vehicle floor structure is provided with notches at corresponding positions in the vehicle front-rear direction on the vehicle front side and rear side of the vehicle, and the front and rear ends open in a state of straddling both the notches and in contact with the edges. A notch reinforcing member having a closed cross-sectional structure is provided, and a load transmission member having one end coupled to the notch reinforcing member and the other end extending to the vicinity of the side sill along the longitudinal direction in the cross member. It is provided.

Furthermore, the invention according to claim 3 is the invention according to claim 2 , wherein the cross member is provided with a mounting portion for mounting the in-vehicle device, and the mounting portion is provided on the inner surface of the mounting portion. A reinforcing member is provided to reinforce the load, and the load transmitting member is coupled to the reinforcing member.

The invention of claim 4 is the invention according to any one of claims 3 to claim 1, wherein the notch reinforcing member, characterized in that the air-conditioning duct is inserted.

  Next, the effect of the present invention will be described.

  First, according to the first aspect of the present invention, the portion of the cross member where the cutout is provided is directly provided by the cutout reinforcing member having a closed cross-sectional structure provided in a state of straddling both cutouts and in contact with the edge thereof. Therefore, it will be reinforced strongly. Therefore, even if a large side impact load is input during a side collision (when an impact load is applied from the side of the vehicle body), stress concentration does not occur around the notch, and as a result, the cross member bends around the notch. As a result, the resistance to side impacts is improved, such as preventing deformation. Further, since the reinforcing bead extending in the vehicle width direction is not provided on the floor panel as in the background art, the floor panel does not become brittle and the proof strength against the front-rear collision does not decrease. In the present invention, the reinforcement is performed not by providing a reinforcing bead on the floor panel as in the background art, but by providing a notch reinforcing member in the notch. This eliminates the need to consider the relationship with the floor panel and improves the layout flexibility of the notches. The notch includes an opening as described in the background art.

According to the present invention, a frame extending in the longitudinal direction of the vehicle body and forming a closed cross section with the lower surface of the floor panel is provided on the lower surface of the floor panel so as to overlap with the notch reinforcing member in plan view. In addition, since the notch reinforcing member is coupled to the frame via a floor panel, the side impact load input to the cross member is transmitted to the frame via the notch reinforcing member and dispersed during a side impact. can do. Further, at the time of front-rear collision, the front-rear collision load input to the frame can be transmitted to the cross member via the notch reinforcing member and dispersed, and the resistance to front-rear collision is further improved.

Further , according to the invention described in claim 2 , in the same manner as in the invention described in claim 1, the portion of the cross member in which the notch is provided straddles both the notches and is in contact with the edge thereof. Because it is directly and strongly reinforced by the notched reinforcing member with the closed cross-section structure provided, stress concentration does not occur around the notch even if a large side impact load is input during a side impact, and as a result, the cross member Thus, deformation such as bending around the notch is prevented, and the resistance to side collision is improved. Further, since the reinforcing bead extending in the vehicle width direction is not provided on the floor panel, the floor panel is not fragile and the proof strength against the front-rear collision is not reduced. Also in the present invention, since the reinforcement is performed by providing a notch reinforcing member in the notch, it is not necessary to consider the relationship with the floor panel in setting the notch disposition position, and the layout freedom of the notch Will improve. The point that the cutout includes an opening is the same as that of the first aspect of the invention.
According to the present invention, the cross member is provided with a load transmission member having one end coupled to the notch reinforcing member and the other end extending to the vicinity of the side sill along the longitudinal direction. Sometimes, when the side sill is displaced inward in the vehicle width direction and comes into contact with the end of the load transmitting member on the side sill side, not only the cross member but also the load transmitting member applies a side impact load to the notch reinforcing member. Can communicate.

Furthermore, according to the invention described in claim 3 , since the load transmission member is coupled to the reinforcing member that reinforces the mounting portion of the in-vehicle device to the cross member, the mounting strength of the load transmission member to the cross member is increased. Can be improved. In addition, the mounting strength of the in-vehicle device with respect to the cross member is also increased.

According to the invention of claim 4 , since the air conditioning duct is inserted into the notch reinforcing member, the edge of the duct and the cross member notch when the air conditioning duct is inserted into the notch of the cross member. It is possible to avoid damage to the duct due to contact with or interference with. Further, as described in claims 1 and 2 , since the layout of the notch is free, the position in the vehicle width direction of the duct can be freely set, and the air conditioning performance is also improved.

  Embodiments of the present invention will be described below.

  FIG. 1 is a perspective view of the vicinity of the front right seat arrangement position on the floor 1 of the vehicle according to the present embodiment as seen from the right front side, FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a cross-sectional view taken along the line CC in FIG. 2. As shown in FIG. 1, a tunnel portion 2 a that extends in the longitudinal direction of the vehicle body and bulges upward is provided at the center in the vehicle width direction of the floor panel 2 that forms the bottom of the vehicle. As shown in FIGS. 2 and 3, both ends of the floor panel 2 in the vehicle width direction are side sills 3 and 3 (in the drawings, only the right side sill 3 in the vehicle body width direction is shown, The parts are provided symmetrically about 2a, and the same applies to the characteristic parts described below. In the present embodiment, the term “joining” refers to joining by welding unless otherwise specified. In addition, simply referring to the front / rear direction refers to the longitudinal direction of the vehicle body, and referring to the left / right direction refers to the left / right direction in the vehicle width direction.

  On the upper surface of the floor panel 2, a cross member 4 extending between the side sills 3, 3 in the vehicle width direction is provided. As shown in FIG. 4, the cross member 4 has a hat shape in cross section, and the front and rear flange portions 4 a and 4 b are joined to the floor panel 2 to form a closed cross section with the floor panel 2. Further, flange portions are provided at both ends in the vehicle width direction as shown in FIGS. 2 and 3, and are joined to the side sills 3 and 3.

  As shown in FIGS. 1 and 2, a cross-sectional hat-shaped frame 5 extending in the longitudinal direction of the vehicle body is joined to the lower surface of the floor panel 2 at approximately the center in the vehicle width direction of the side sills 3 and 3 and the tunnel portion 2a. Yes.

  Here, as shown in FIGS. 1 to 3, the front side wall 4 c and the rear side wall 4 d of the cross member 4 have a side sill 33 and a tunnel portion 2 a in detail at positions corresponding to the longitudinal direction of the vehicle body. At substantially the center in the vehicle width direction, cutouts 4e and 4f having a substantially square shape in side view are provided. The cutouts 4e and 4f are fitted with a cutout reinforcing member 10 made of metal having a square cylindrical shape with front and rear ends opened. The cutout reinforcing member 10 is arranged so as to overlap with the frame 5 in a plan view, and the lower wall 10a is overlapped with the floor panel 2 and the flange portions 5a and 5a of the frame 5 by a symbol a in FIG. Are joined by spot welding. A plurality of semicircular cutouts are provided at the front and rear ends of the upper wall 10b of the cutout reinforcing member 10 so as to allow insertion of a welding gun during spot welding.

  The longitudinal length of the cutout reinforcing member 10 is longer than the width of the cross member 4 (length in the longitudinal direction of the vehicle body) at the portion where the cutout reinforcing member 10 is disposed, as shown in FIGS. . Further, flange portions 4g and 4h connected to the flange portions 4a and 4b are respectively provided at the edge portions of the notches 4e and 4f of the cross member 4, and these flange portions 4g and 4h are provided on the notch reinforcing member 10. As shown by a symbol b in FIGS. 2 to 4, the outer surfaces of the front and rear ends of the wall 10 b and the vertical walls 10 c and 10 c are joined by arc welding.

  As shown in FIG. 2, in the closed cross-sectional space surrounded by the cross member 4 and the floor panel 2, between the side sill 3 and the cutout reinforcing member 10, the cross member 4 is arranged in the longitudinal direction (in the vehicle width direction). ), A square metal pipe 11 having a quadrangular cross section (see FIG. 4) is disposed, and one end of the vertical pipe 10c on the side sill side of the cutout reinforcing member 10 is indicated by reference numeral c in FIGS. It is joined to the outer surface by arc welding. On the other hand, the other end is not joined to the inner wall 3a of the side sill 3, and a gap is provided. Further, a gap of, for example, about 5 to 10 mm is provided between the lower surface of the lower wall 11 a of the square pipe 11 and the upper surface of the floor panel 2. The purpose of this is to prevent the lower wall 11a of the square pipe 11 and the floor panel 2 from coming into contact with each other due to vehicle vibration during traveling. Moreover, the upper wall 11b of the square pipe 11 and the upper wall 10b of the notch reinforcing member 10 are abutted so as to be substantially flush with each other. This is because when the impact load is transmitted from the side sill 3 side to the side sill 3 side end portion of the square pipe 11 due to a side collision (an impact load acts from the direction of arrow A in FIG. 2), The object is to suppress the wall 10c from being deformed by the load as much as possible.

  As shown in FIGS. 2 and 4, fixing brackets 21 and 21 of the seat device 20 constituting the front right seat are fixed to the upper left and right of the front side wall 4 c of the cross member 4 with bolts and nuts. In that case, seat attachment portion reinforcing members 22 and 23 for reinforcing the attachment portions are provided at portions where the fixing brackets 21 and 21 are attached on the inner surface of the side wall 4c of the cross member 4. Here, the nut is welded in advance to the seat attachment portion reinforcing members 22 and 23.

  In that case, the sheet attachment portion reinforcing member 22 on the side sill 3 side is joined to the inner surface of the front side wall 4c of the cross member 4 by spot welding as shown by reference numeral d (see FIG. 3), as shown in FIGS. A front wall portion 22a, a side wall portion 22b that extends rearward from the end of the front wall portion 22a on the side sill 3 side and is substantially parallel to the inner surface of the side sill 3, and a lower end of the side wall portion 22b that faces the square pipe 11 And a lower wall portion 22c having a substantially horizontal surface. The end portion of the lower wall portion 22c on the side of the square pipe 11 extends to the space in the square pipe 11, and is joined to the inner surface of the lower wall portion 11a of the square pipe 11 by arc welding as indicated by symbol e (see FIG. 4). ing. A predetermined gap Z is provided between the side wall portion 22 b of the seat attachment portion reinforcing member 22 and the inner wall 3 a of the side sill 3. The predetermined gap Z does not contact the side wall portion 22b of the seat mounting portion reinforcing member 22 and the inner wall 3a of the side sill 3 due to vibration during vehicle running or the like. The distance is set so as to quickly come into contact with the side wall portion 22b (for example, about 3 mm). Further, since the welding of the lower wall portion 22c and the lower wall portion 11a of the square pipe 11 is performed in a state where the end portions are not in contact with each other but are overlapped, for example, the length of the square pipe 11 in the vehicle width direction, etc. Even if there is a slight error, there is no error in the gap Z.

  As shown in FIG. 1, an air conditioner 31 is provided inside an instrument panel (not shown) provided at the front part of the passenger compartment of the vehicle, above the tunnel part 2a at the center in the vehicle width direction. The conditioned air from the air conditioner 31 blows out directly to the front seat through the opening of the instrument panel, and a pair of left and right air conditioning ducts 32 and 32 (in FIG. Only the duct 32 is shown). These air-conditioning ducts 32 and 32 are made of resin and have a flat shape. For example, the right-hand duct 32 extends downward from the lower part of the air-conditioning device 31 and bends backward on the side of the tunnel portion 2a. The tunnel portion 2a extends in the same direction along the side of the tunnel portion 2a, bends outward in the vehicle width direction immediately before the cross member 4, extends in the same direction along the upper surface of the flat portion 2b of the floor panel 2, and the tunnel portion 2a. And the side sill 3 are bent rearward at substantially the center in the vehicle width direction (in front of the opening of the notch reinforcing member 10) and extend to the lower side of the seat device 20 through the space inside the notch reinforcing member 10. Note that the left duct 32 has a bilaterally symmetric configuration with the right duct 32, and a description thereof will be omitted.

  Next, the effect of the floor structure according to the present embodiment will be described.

First, in the present embodiment, notches 4e and 4f are provided at corresponding positions in the front-rear direction of the vehicle body on the front side wall 4c and the rear side wall 4d of the cross member 4, but these notches 4e and 4f Since the notch reinforcing member 10 having a closed cross-sectional structure in which the front and rear ends open is provided straddling and in contact with the edge portion, the cross member 4 is firmly reinforced by the notch reinforcing member 10. Therefore, even if a large side collision load is input during a side collision (when an impact force is applied to the side sill 3 or the like from the side of the vehicle body as indicated by an arrow A in FIG. 2), stress concentration occurs around the notches 4e and 4f. As a result, the cross member 4 is prevented from being deformed around the notches 4e and 4f due to the side collision, and the proof strength against the side collision is improved. Further, since the reinforcing bead extending in the vehicle width direction is not provided on the floor panel as in the background art, the floor panel 2 does not become brittle and the proof strength against the front-rear collision does not decrease. In the present embodiment, the reinforcement is performed not by providing beads on the floor panel as in the background art, but by providing the notch reinforcing member 10 directly in the notches 4e and 4f. It is not necessary to consider the relationship with the floor panel 2 when setting the arrangement positions of 4e and 4f, and the layout flexibility of the notches 4e and 4f is improved.
Deformation such as bending of the cross member around the notch is prevented.

  Further, on the lower surface of the floor panel 2, a frame 5 extending in the longitudinal direction of the vehicle body and forming a closed cross section with the lower surface of the floor panel 2 is provided by being overlapped with the notch reinforcing member 10 in a plan view, Since the cutout reinforcing member 10 is coupled to the frame 5 via the floor panel 2, a side collision load input to the cross member 4 during a side collision is applied to the frame 5 through the cutout reinforcing member 10. Can be transmitted and distributed. Further, at the time of front / rear collision, the front / rear collision load input to the frame 5 can be transmitted to the cross member 4 via the notch reinforcing member 10 and distributed, thereby improving the front / rear collision resistance. .

  And in the cross member 4, there is provided a load transmission member 11 having one end coupled to the notch reinforcing member 10 and the other end extending to the vicinity of the side sill along the longitudinal direction thereof. When the side sill 3 is displaced inward in the vehicle width direction and comes into contact with the end of the load transmitting member 11 on the side sill 2 side, not only the cross member 4 but also the load transmitting member 11 causes the notch reinforcing member 10 and the frame. A side impact load can be transmitted to 5.

  Furthermore, since the load transmission member 11 is coupled to the sheet attachment portion reinforcing member 22 that reinforces the attachment portion of the seat device 20 to the cross member 4, the attachment strength of the load transmission member 11 to the cross member 4 is improved. be able to. In addition, the attachment strength of the seat device 20 to the cross member 4 is also increased.

  Further, since the air conditioning duct 32 is inserted through the notch reinforcing member 10, when the air conditioning duct 32 is inserted into the notches 4 e and 4 f of the cross member 4, Damage to the duct 32 due to contact and interference with the edge can be avoided. Further, as described above, since the layout of the positions in the vehicle width direction of the notches 4e and 4f becomes free, the position in the vehicle width direction of the duct 32 can be set freely, and air conditioning performance is improved. Become.

  Here, the attachment of the notch reinforcing member 10 and the like will be briefly described. First, one end of the square pipe 11 is joined to a predetermined position on the outer surface of the vertical wall 10c on the side sill side in the notch reinforcing member 10 by arc welding. Further, the sheet attachment portion reinforcing member 22 is joined to a predetermined position on the inner surface of the front side wall 4c of the cross member 4 by spot welding. Next, the notch reinforcing member 10 to which the square pipe 11 is fixed is fitted into the notches 4e and 4f of the cross member 4, and the flange portions 4g and 4h at the edges of the notches 4e and 4f and the upper wall 10b of the notch reinforcing member 10 are vertically The walls 10c and 10c are joined by arc welding. On the other hand, the square pipe 11 is overlapped on the inner surface of the lower wall portion 11a with the lower wall portion 22c of the seat attachment portion reinforcing member 22 and joined by arc welding. At this time, since the lower wall portion 11a of the square pipe 11 and the lower wall portion 22c of the seat attachment portion reinforcing member 22 are not butted together, even if variations in manufacturing accuracy and assembly accuracy occur, the error Can be absorbed and adjusted. Then, the cross member 4 in a state where the notch reinforcing member 10 is fixed is placed at a predetermined position of the floor panel 2, and the flange portions 4a and 4b of the cross member 4 and the floor panel 2 are joined by spot welding, The parts where the lower wall 10a of the cutout reinforcing member 10, the floor panel 2, and the flange portions 5a and 5a of the frame 5 overlap are joined by spot welding. According to this, this floor structure can be formed easily.

  Note that the correspondence between the constituent elements of the present embodiment and the constituent elements of the claims will be described. The floor panel in claim 1 of the claims corresponds to the floor panel 2, and the cross member is a cross member. Corresponding to the member 4, the notch corresponds to the notches 4e and 4f, the notch reinforcing member corresponds to the notch reinforcing member 10, the frame in claim 2 corresponds to the frame 5, and the side sill in claim 3 corresponds to the side sill 3. The load transmitting member corresponds to the square pipe 11, the in-vehicle device in claim 4 corresponds to the seat device 20, the reinforcing member corresponds to the seat attachment portion reinforcing member 22, and the air conditioning duct corresponds to the air conditioning duct 32. The notch in the claims includes an opening as in the background art.

  According to the present invention, a cross member extending in the vehicle width direction and forming a closed cross section with the floor upper surface is provided on a floor forming a vehicle bottom, and a vehicle body on the vehicle front side and rear side of the cross member is provided. The present invention can be widely applied to a vehicle floor structure in which notches are provided at corresponding positions in the front-rear direction.

1 is a perspective view of a vehicle floor structure according to an embodiment of the present invention. It is sectional drawing by the AA line of FIG. It is an arrow view by the arrow B of FIG. It is sectional drawing by CC line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor 2 Floor panel 3 Side sill 4 Cross member 4e, 4f Notch 5 Frame 10 Notch reinforcement member 11 Square pipe (load transmission member)
20 Seat device (on-vehicle device)
22 Seat attachment part reinforcement member (reinforcement member)
32 Air conditioning duct

Claims (4)

A cross member that extends in the vehicle width direction and forms a closed cross section with the top surface of the floor panel is provided on the floor panel that forms the bottom of the vehicle, and the vehicle body longitudinal direction on the vehicle front side and rear side of the cross member Vehicle floor structure in which notches are respectively provided at corresponding positions,
A notch reinforcing member having a closed cross-sectional structure in which the front and rear ends are opened in a state of straddling both notches and in contact with the edge thereof , and
On the lower surface of the floor panel, a frame that extends in the longitudinal direction of the vehicle body and forms a closed cross section with the lower surface of the floor panel is provided by being overlapped with the notch reinforcing member in plan view,
The vehicle floor structure , wherein the cutout reinforcing member is coupled to the frame via a floor panel . A cross member that extends in the vehicle width direction and forms a closed cross section with the top surface of the floor panel is provided on the floor panel that forms the bottom of the vehicle, and the vehicle body longitudinal direction on the vehicle front side and rear side of the cross member Vehicle floor structure in which notches are respectively provided at corresponding positions,
A notch reinforcing member having a closed cross-sectional structure in which the front and rear ends are opened in a state of straddling both notches and in contact with the edge thereof, and
A vehicle floor structure, characterized in that a load transmission member is provided in the cross member along the longitudinal direction thereof, one end of which is coupled to the cutout reinforcing member and the other end extends to the vicinity of the side sill . In the vehicle floor structure according to claim 2 ,
The cross member is provided with a mounting portion for mounting the in-vehicle device,
A reinforcing member for reinforcing the mounting portion is provided on the inner surface of the mounting portion.
The vehicle floor structure , wherein the load transmitting member is coupled to the reinforcing member . In the vehicle floor structure according to any one of claims 1 to 3 ,
An air conditioning duct is inserted through the cutout reinforcing member.

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