JP4752471B2 - Vehicle body structure at the bottom of the vehicle - Google Patents

Description

The present invention relates to a vehicle body structure at the bottom of a vehicle, and in particular , to a floor panel provided with a tunnel portion, left and right cross members extending in the vehicle width direction, and a tunnel reinforcement member positioned above the tunnel portion to reinforce the tunnel portion And a cross member reinforcing member that is positioned below the tunnel portion and connects the left and right cross members, thereby increasing the rigidity of the vehicle body and further preventing a decrease in the bonding strength when a plurality of members are bonded. Concerning structure.

  Conventionally, in order to improve the torsional rigidity of the vehicle body and the surface rigidity of the floor panel, it has been known to form an upwardly raised tunnel portion extending in the vehicle front-rear direction substantially at the center of the floor panel in the vehicle width direction. In order to further increase the rigidity of the tunnel part, it is also known to join a tunnel reinforcing member to the upper part of the tunnel part.

  Furthermore, in recent years, in order to enhance safety at the time of a side collision, left and right cross members that extend in the vehicle width direction and connect the side sill and the tunnel portion are arranged on the floor panel, and between the left and right cross members, It is known to provide a cross member reinforcing member that extends in the vehicle width direction below (inward) the tunnel portion and connects the left and right cross members.

  For example, in Patent Document 1 below, a tunnel portion is provided in a floor panel, a tunnel reinforcement is joined to the upper wall and upper side wall of the tunnel portion, and left and right cross members extending in the vehicle width direction are disposed on the floor panel. A vehicle bottom body structure having a tunnel stay extending in the vehicle width direction below the tunnel portion is disclosed.

However, to further enhance the body rigidity, obtained so that securely retain the shape of the tunnel portion, extending the tunnel reinforcement member to the lower side surface not only tunnel portion upper, be placed from above so as to cover the whole tunnel section Conceivable.

  However, according to such a vehicle body structure, it is necessary to join the tunnel reinforcement members in a state of being overlapped together with the left and right cross members and the tunnel reinforcement members joined to the lower part of the side surface of the tunnel portion. The panel body must be joined by spot welding or the like.

  However, if the four sheets are overlapped and joined in this way, there is a high possibility that the gaps between the panels will vary, and there is a possibility that sufficient “nuggets” cannot be generated between the panels. The possibility of a defect arises and there exists a possibility that each panel body may not be welded enough.

  Therefore, the present applicant has previously filed Japanese Patent Application No. 2005-302569 (hereinafter referred to as a prior application). In this prior application, notches are provided at both ends of the tunnel reinforcing member, the cross member reinforcing member and the left and right cross members are joined to each other via the floor panel at the notch, and the both ends of the notch are arranged in the vehicle width direction. A bottom body structure is proposed that extends outward and is joined to a cross member reinforcement member via a floor panel.

  According to this structure, it is possible to eliminate the joint point where the four sheets are stacked, so that it is possible to eliminate the fear that the panel bodies are not sufficiently welded.

JP-A-8-80874

  However, according to the structure of the above-mentioned prior application, since the notch portion is provided on the side portion of the tunnel reinforcing member, when the vehicle front-rear direction load is input at the time of the vehicle front collision, the tunnel reinforcing member is centered on the notch portion. There is a problem that the mouth opening deformation is likely to occur, and countermeasures are required.

  In addition, even if both ends of the notch are extended to the outside in the vehicle width direction and joined to the cross member reinforcing member by this measure, if this joining portion peels off after all, There arises a problem that opening deformation occurs.

Accordingly, the present invention provides a vehicle in which a tunnel portion is formed on a floor panel, a tunnel reinforcing member is joined from the upper surface to the side surface of the tunnel portion, and the left and right cross members and the cross member reinforcing member are overlapped and joined to the side surface. In the bottom vehicle body structure of this type, it is possible to securely join four members by joining three layers while eliminating the risk of opening deformation of the tunnel reinforcing member by eliminating the notch, and rigidity in the vicinity of the tunnel portion. An object of the present invention is to provide a vehicle body structure at the bottom of a vehicle that can enhance the vehicle.

The bottom body structure of a vehicle according to the present invention has a flat panel portion and a tunnel portion bulging upward so as to extend in the vehicle front-rear direction at a substantially center in the vehicle width direction. Includes a tunnel reinforcing member that is positioned from the upper part of the tunnel part to the plane part and reinforces the tunnel part, and left and right cross members that extend outward from the tunnel part in the vehicle width direction, and are arranged below the floor panel. Is a vehicle body structure at the bottom of a vehicle in which a cross member reinforcing member that extends in the vehicle width direction and connects the left and right cross members via a floor panel is disposed, and the cross member is overlapped with the tunnel reinforcing member and forming an opening cut out portion, the cross member in the opening, joined to the cross member reinforcing member via the floor panel, the click The scmember is joined to the cross member reinforcing member via the floor panel at a position outside the vehicle width direction outer end portion of the tunnel reinforcing member via the floor panel, and the opening is formed corresponding to the side surface portion of the tunnel portion. The cross member is joined to a side surface portion of the tunnel portion in the opening portion, and is configured by a member member extending outward in the vehicle width direction in a substantially hat-shaped cross section that opens downward from the side surface portion of the tunnel portion in the opening portion, The cross member reinforcing member is joined to the vehicle outer surface of the side surface portion of the tunnel portion corresponding to the opening portion, and extends in the vehicle width direction so as to be joined to the left and right cross members via the floor panel in the shape of an open cross-section road hat. It is composed of member members .

According to the said structure, a cross member and a cross member reinforcement member are joined via a floor panel in the opening part formed in the tunnel reinforcement member.
Therefore, the tunnel reinforcing members, cross members, be part of the cross member reinforcing member 4 members and the floor panel is polymerized, by forming the opening portion can be joined in a 3-ply. Further, since the tunnel reinforcing member only forms an opening, even when a load in the vehicle front-rear direction is input, there is no possibility of opening deformation as in the case where a notch is provided.

In addition, the opening part mentioned above does not need to open all the superposition | polymerization parts of a cross member, and what opened a part of superposition | polymerization part may be used.
The shape of the opening may be rectangular according to the shape of the cross member, or may be circular regardless of the shape.

Further , since the cross member is joined to the cross member reinforcing member via the floor panel at a position outside in the vehicle width direction from the outer end portion in the vehicle width direction of the tunnel reinforcing member , the cross member has an opening. At the portion in the section and the outer position in the vehicle width direction of the tunnel reinforcing member, the cross member is joined to the cross member reinforcing member via the floor panel so as to straddle the tunnel reinforcing member.
For this reason, the cross member can directly transmit the side collision load to the cross member reinforcing member without interposing the tunnel reinforcing member.
Therefore, the transmissibility of the side member impact load of the cross member can be further improved, and the side impact safety performance of the vehicle can be improved.

The bottom body structure of the vehicle according to claim 2 has a floor portion of the vehicle having a flat portion and a tunnel portion bulging upward so as to extend in the vehicle front-rear direction at substantially the center in the vehicle width direction, On the floor panel, a tunnel reinforcing member that is positioned from the upper part of the tunnel part to the flat part and reinforces the tunnel part, and left and right cross members that extend outward from the tunnel part in the vehicle width direction are disposed, Below the floor panel is a bottom body structure of a vehicle in which a cross member reinforcing member that extends in the vehicle width direction and connects the left and right cross members via the floor panel is disposed. Forming an opening cut out from a portion overlapping with the member, and joining the cross member to the cross member reinforcing member via a floor panel in the opening; The loss member reinforcing member extends to the outer side in the vehicle width direction from the opening of the tunnel reinforcing member of the floor panel, and the opening of the tunnel reinforcing member of the floor panel is provided at the outer end of the cross member reinforcing member. Further, a notch or an opening is formed at a portion outside the vehicle width direction, and the cross member is joined to the floor panel via the tunnel reinforcing member at the notch or the opening.

According to the above configuration, the cross member and the tunnel reinforcing member are joined together with the floor panel at the notch at the outer end of the cross member reinforcing member or at the opening.
For this reason, the outer end portion in the vehicle width direction of the tunnel reinforcing member is reliably joined to the floor panel and the cross member, and is prevented from being lifted and separated from the floor panel at the time of a side collision.

Therefore, the side collision response force of the tunnel reinforcing member can be increased, and the side collision safety performance of the vehicle can be improved.

The bottom body structure of the vehicle according to claim 3 includes a flat panel and a tunnel portion bulging upward so as to extend in the vehicle front-rear direction at a substantially center in the vehicle width direction. On the floor panel, a tunnel reinforcing member that is positioned from the upper part of the tunnel part to the flat part and reinforces the tunnel part, and left and right cross members that extend outward from the tunnel part in the vehicle width direction are disposed, Below the floor panel is a bottom body structure of a vehicle in which a cross member reinforcing member that extends in the vehicle width direction and connects the left and right cross members via the floor panel is disposed. Forming an opening cut out from a portion overlapping with the member, and joining the cross member to the cross member reinforcing member via a floor panel in the opening; In the lower panel, a cross member seat that protrudes toward the vehicle interior side corresponding to the opening of the tunnel reinforcing member is formed, and an in-vehicle equipment mounting portion is set near the cross member seat of the floor panel, The raised portion of the cross member seat portion is formed so as to be continuous with the in-vehicle equipment attachment portion .
According to the said structure, since the cross member seat part has protruded, the rigidity of a cross member seat part can be made higher than another floor panel site | part. In addition, since the cross member seat that protrudes toward the vehicle interior side is formed on the floor panel, when the tunnel reinforcement member is assembled to the floor panel, it is easy to position by simply aligning the opening with the raised cross member seat. Can be performed.
Therefore, by forming the raised cross member seat portion, the mounting rigidity of the cross member can be increased, and the assembling property of the tunnel reinforcing member to the floor panel can be improved.

Further , in the vicinity of the cross member seat portion of the floor panel, an in-vehicle equipment mounting portion is set, and the bulge of the cross member seat portion is formed so as to be continuous with the in-vehicle equipment mounting portion . Since the cross member seat portion continuously protrudes from the in-vehicle equipment attachment portion, the rigidity of the in-vehicle equipment attachment portion can be made higher than that of other floor panel portions.
Therefore, not only the cross member seat portion but also the mounting rigidity of the on-vehicle equipment mounting portion can be increased.

In particular, when the cross member seat portion and the in-vehicle equipment mounting portion are arranged side by side in the vehicle front-rear direction, a bead-shaped raised portion is formed on the floor panel so as to extend in the vehicle front-rear direction. The rigidity of the floor panel in the vehicle front-rear direction can also be increased.
Here, the in-vehicle equipment attached to the in-vehicle equipment attachment portion may be a seat, a seat belt device, an airbag device, an acoustic device, or the like, and is not particularly limited.

The bottom body structure of the vehicle according to claim 4 includes a flat part and a tunnel part bulged upward so as to extend in the vehicle front-rear direction at a substantially center in the vehicle width direction, On the floor panel, a tunnel reinforcing member that is positioned from the upper part of the tunnel part to the flat part and reinforces the tunnel part, and left and right cross members that extend outward from the tunnel part in the vehicle width direction are disposed, Below the floor panel is a bottom body structure of a vehicle in which a cross member reinforcing member that extends in the vehicle width direction and connects the left and right cross members via the floor panel is disposed. Forming an opening cut out from a portion overlapping with the member, and joining the cross member to the cross member reinforcing member via a floor panel in the opening; A cross member seat that protrudes toward the vehicle interior side is formed on the lower panel corresponding to the opening of the tunnel reinforcement member, and an edge of the opening of the tunnel reinforcement member is protruded toward the vehicle interior side. Formed .
According to the said structure, since the edge part of an opening part protrudes toward the vehicle interior side, the rigidity of an opening part periphery can be improved.
Therefore, the rigidity fall by having formed the opening part can be supplemented, and the high rigidity of a tunnel reinforcement member can be maintained.

The bottom body structure of the vehicle according to claim 5 includes a tunnel portion that is formed so that a floor panel of the vehicle bulges upward so as to extend in the vehicle front-rear direction at a substantially center in the vehicle width direction. On the floor panel, a tunnel reinforcing member that is positioned from the upper part of the tunnel part to the flat part and reinforces the tunnel part, and left and right cross members that extend outward from the tunnel part in the vehicle width direction are disposed, Below the floor panel is a bottom body structure of a vehicle in which a cross member reinforcing member that extends in the vehicle width direction and connects the left and right cross members via the floor panel is disposed. Forming an opening cut out from a portion overlapping with the member, and joining the cross member to the cross member reinforcing member via a floor panel in the opening; The loss member reinforcing member is extended to a position where it overlaps with the flat portion of the floor panel, and a notch or an opening is formed in the outer end portion of the cross member reinforcing member at a portion overlapping with the flat portion of the floor panel. The cross member is joined to the floor panel via a tunnel reinforcing member at the notch or opening.
According to the above configuration, the notches of the outer end portion of the cross member reinforcing member, or at the site of the opening, so that the cross member and the tunnel reinforcement member is joined with the floor panel.
For this reason, the outer end portion in the vehicle width direction of the tunnel reinforcing member is reliably joined to the floor panel and the cross member, and is prevented from being lifted and separated from the floor panel at the time of a side collision.
Therefore, the side collision response force of the tunnel reinforcing member can be increased, and the side collision safety performance of the vehicle can be improved.

In one embodiment of the present invention, a plurality of joint points with the cross member reinforcing member at the outer position in the vehicle width direction of the cross member are set in the vehicle front-rear position, and the joint points are offset from each other in the vehicle width direction. It is set to do.
According to the above configuration, when the side collision load is input, the separation points of the cross member at the outer position in the vehicle width direction are alternately shifted at the front and rear positions.
Therefore, the separation of the cross member from the floor panel at the time of a side collision is suppressed, the transmission performance of the side impact load is further increased, and the side impact safety performance of the vehicle can be improved.

According to an embodiment of the present invention, a cross member seat is formed on the floor panel so as to protrude toward the vehicle interior side corresponding to the opening of the tunnel reinforcing member.
According to the said structure, since the cross member seat part has protruded, the rigidity of a cross member seat part can be made higher than another floor panel site | part. In addition, since the cross member seat that protrudes toward the vehicle interior side is formed on the floor panel, when the tunnel reinforcement member is assembled to the floor panel, it is easy to position by simply aligning the opening with the raised cross member seat. Can be performed.
Therefore, by forming the raised cross member seat portion, the mounting rigidity of the cross member can be increased, and the assembling property of the tunnel reinforcing member to the floor panel can be improved.

According to the present invention, since an opening is provided in the tunnel reinforcing members, the tunnel reinforcing members, cross members, the cross member reinforcing member, and even 4 parts member is polymerization of the floor panel, at 3 ply Can be joined. In addition, since the tunnel reinforcing member only has an opening, opening deformation may occur when a notch is provided in the tunnel reinforcing member when a vehicle longitudinal load is input. Nor.

Therefore, a bottom body structure of a vehicle in which a tunnel portion is formed on the floor panel, a tunnel reinforcing member is joined from the top surface to the side surface of the tunnel portion, and the left and right cross members and the cross member reinforcing member are joined to each other on the side surface. In this case, it is possible to reliably join four members by joining three layers while eliminating the risk of opening deformation of the tunnel reinforcing member by eliminating the notch portion, and to increase the rigidity in the vicinity of the tunnel portion. it can.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall perspective view of a vehicle body floor which is a bottom vehicle body structure of a vehicle in which the present invention is adopted, and FIG. 2 is an exploded perspective view of each member constituting the vehicle body floor.

As shown in FIGS. 1 and 2, the vehicle body floor of this embodiment, a tunnel that bulges upward extending in the longitudinal direction of the vehicle at the plane portion 1A in the vehicle width direction substantially central extending in the longitudinal direction and the vehicle width direction the vehicle A floor panel 1 having a portion 1B, a tunnel reinforcement 2 extending in the vehicle front-rear direction so as to cover the tunnel portion 1B on the vehicle rear side above the tunnel portion 1B, and a vehicle width of the tunnel reinforcement 2 Left and right third cross members 3, 3 extending in the vehicle width direction on both sides in the direction and connecting the tunnel portion 1B and the side sill S (see FIG. 5), and the left and right third cross members 3 installed in the tunnel portion 1B. , 3 and a third cross reinforcement 4 for reinforcing the space.

  The aforementioned floor panel 1 is formed with a relatively thin panel (for example, an iron plate) (for example, an iron plate) in order to reduce the weight of the vehicle body. However, by forming the tunnel portion 1B that bulges upward substantially at the center in the vehicle width direction, surface rigidity is ensured and the torsional rigidity of the floor panel 1 is maintained.

  The tunnel portion 1B is composed of an upper surface portion 11 extending in the vehicle front-rear direction and vertical wall-shaped side surface portions 12, 12 extending in the vehicle front-rear direction on both sides thereof. The height of the tunnel portion 1B of the present embodiment is not so high as in the so-called FR type in which the propeller shaft is disposed through, since the vehicle driving system is a so-called FF type of front engine / front drive. It is set.

Further, in order to join a third cross member 3 to be described later to the center of the side surface portion 12 of the tunnel portion 1B, a cross member seat portion 13 (see FIG. 2) raised to the vehicle interior side (vehicle width direction outer side). ) Is formed.

  The tunnel reinforcement 2 described above is formed of a bowl-shaped member having a substantially U-shaped cross section formed from a panel body having a medium thickness (for example, about 0.8 mm), and is formed from the upper surface portion 11 of the tunnel portion 1B. It installs so that the whole to the lower part of the side part 12 may be covered.

  By installing the tunnel reinforcement 2 in this way, the shape of the tunnel portion 1B is securely maintained, and the tunnel portion 1B is thin, and the tunnel portion 1B height is low. The rigidity of the tunnel portion 1B is increased.

  Further, a substantially rectangular opening 5 having a longitudinal direction in the vehicle front-rear direction is formed in the center of the side of the tunnel reinforcement 2 in the front-rear direction. The position where the opening 5 is formed is a portion where the third cross member 3 described later is overlapped. By forming the opening 5, the third cross member 3 is directly connected to the tunnel portion 1B of the floor panel 1. It can be joined to.

  The above-mentioned third cross members 3 and 3 are formed of a member member having a generally open hat shape with a downward opening and formed of a relatively thick (for example, about 1.6 mm) and highly rigid panel body. , Each extend in the vehicle width direction and connect the tunnel portion 1B and the side sill S (see FIG. 5).

  By providing the third cross members 3 and 3, a side impact load is easily transmitted to the tunnel portion 1B, and deformation of the side sill S toward the vehicle body inward side can be suppressed. Further, since the third cross members 3 and 3 are also joined to the floor panel 1, the surface rigidity of the floor panel 1 can be increased.

  The above-described third cross reinforcement 4 is also composed of a member member having a hat-shaped cross section formed of a relatively thick (for example, about 1.6 mm) and highly rigid panel body, and extends upward along the shape of the tunnel portion 1B. It is raised. By joining to the inner surface (vehicle outer side) of the tunnel portion 1B, the left and right third cross members 3 and 3 are connected via the floor panel 1 (see FIG. 6).

  By providing the third cross reinforcement 4, the side collision load input from one third cross member 3 can be transmitted to the other third cross member 3, and the side collision of the third cross member 3 can be transmitted. The response capability can be increased to improve the vehicle side collision safety performance. In addition, since the shape of the tunnel portion 1B can be maintained, the rigidity of the tunnel portion 1B can be increased.

  The vehicle body floor of the present embodiment is configured by joining these members in combination. Next, the assembly and joining work of the vehicle body floor will be described.

  First, the tunnel reinforcement 2 is installed above the tunnel portion 1B on the upper surface of the floor panel 1, and the surrounding joint flange is spot-welded with a welding gun (not shown), so that the tunnel reinforcement 2 is Join the floor panel 1.

  When installing the tunnel reinforcement 2, it is easy to position the two by combining the two in such a manner that the opening 5 of the tunnel reinforcement 2 is fitted to the cross member seat 13 of the tunnel 1B. Can be done.

Then, the third cross member 3 is placed on the floor panel 1 in accordance with the opening 5 of the tunnel reinforcement 2, and the third cross reinforcement 4 is installed on the lower side thereof. Both are joined by spot welding to the floor panel 1 or the like with a joining flange.
Through the above steps, the assembly and joining work of the vehicle body floor according to the present embodiment is completed.

In this embodiment, the assembly and joining are completed by this spot welding operation. However, in the structure of the above-mentioned Japanese Patent Application No. 2005-302569, which is a prior application, the third cross member must be joined in advance. Since the third cross reinforcement cannot be joined, it is necessary to perform spot welding with the floor panel 1 turned over, which increases the number of steps.
Therefore, in the present embodiment, the turning over process is eliminated by devising the shape of the joint flange, the shape of the third cross reinforcement 4, and the like.

  By the way, spot welding performed in this joining operation is a kind of overlap resistance welding, in which the body panel is overlapped, the upper and lower electrodes of the welding gun are aligned with the welding point of the body panel, and in a pressurized state. By energizing, a joining metal (hereinafter referred to as nugget) is generated between the vehicle body panels, and welding is performed.

  In this spot welding, if the number of panels that are superposed at one time increases, the nuggets may not be sufficiently generated between the panels. It is desirable to join.

  In the vehicle body floor according to the present embodiment, the third cross member 3, the tunnel reinforcement 2, and the third cross reinforcement 4 including the floor panel 1 are included in the joint portion of the third cross member 3 on the tunnel portion 1 </ b> B side. Four members, that is, four vehicle body panels need to be overlapped, and if they are joined together, four vehicle body panels must be joined.

Therefore, in the present embodiment, the opening 5 is formed in the tunnel reinforcement 2 as described above, so that even at this joining portion, a maximum of three pieces can be joined. Next, the detailed structure of the joining portion of the third cross member 3 on the tunnel side will be described with reference to FIGS.

  3 is a detailed perspective view of the joining portion, FIG. 4 is a plan view of the joining portion, FIG. 5 is a sectional view taken along line AA in FIG. 1, FIG. 6 is a sectional view taken along line BB in FIG. 7 is a cross-sectional view taken along the line CC of FIG. 4. Similarly, FIG. 8 is a DD line, FIG. 9 is an EE line, FIG. 10 is an FF line, and FIG. FIG. 12 is a cross-sectional view taken along line HH. In each figure, IN indicates the interior of the vehicle and OUT indicates the exterior of the vehicle.

Figure 3 Oyo As shown in beauty Figure 4, the junction of the third cross-member 3 tunnel section 1B side, the third cross member 3 through an opening 5 formed in the tunnel reinforcement 2 above Is directly joined to the cross member seat 13 of the tunnel 1B.

A tunnel joining flange 31 joined to the cross member seat 13 is formed at the inner end in the vehicle width direction of the third cross member 3, and joined to the flat portion 1 </ b> A of the floor panel 1 at the lower end. A flat joint flange portion 32 is formed.

Further, the tunnel reinforcement 2 is formed with a planar extending portion 21 extending in the vehicle front-rear direction and joined to the planar portion 1A of the floor panel 1 at the side end portion thereof. The planar extending portion 21 is formed so as to extend in the vehicle front-rear direction including a portion located below the third cross member 3.

Further, the periphery of the opening 5 of the tunnel reinforcement 2 forms a step portion 51 that bulges vehicle interior side in (vehicle width direction outer side, or One upper side). By forming the stepped portion 51, the rigidity reduction due to the provision of the opening 5 is compensated.

  The step portion 51 extends to the rear side of the vehicle as it is, and is configured to substantially surround the periphery of the seat attachment portion 6 for attaching a seat (not shown) (61). As a result, the rigidity of the seat mounting portion 6 is also increased.

  Similarly, the tunnel portion 1B of the floor panel 1 also has a seat mounting step 14 that protrudes from the cross member seat 13 to the vehicle rear side (see FIG. 2). By forming this seat attachment step 14, the floor panel 1 is formed with bead-shaped steps (13, 14) extending in the vehicle front-rear direction on the side surface 12 of the tunnel portion 1B. The rigidity can be increased with respect to the load in the vehicle longitudinal direction at the time of a vehicle front collision.

  A third cross reinforcement 4 is joined to the lower surface of the floor panel 1 (indicated by a broken line in FIGS. 3 and 4). The third cross reinforcement 4 is also joined to the floor panel 1 by front and rear joining flanges 41 and 42 (see FIG. 2) corresponding to the joining position of the third cross member 3. Moreover, in order to reinforce also including the above-mentioned seat attachment part 6, the extension part 43 extended in the vehicle rear side is provided.

  At the joint portion of the third cross member 3 on the inner side in the vehicle width direction, there are a total of seven joint points (however, one portion does not directly join the third cross member 3). 3, the third cross reinforcement 4, the tunnel reinforcement 2, and the floor panel 1 are joined. For convenience, each joint point will be described with reference numerals “A” to “G”.

  As shown in FIG. 3, the junction points on the tunnel portion 1B side of the third cross member 3 are set at two locations “a” and “b” of the tunnel junction flange 31 and the junction points on the plane portion 1A side. Are set to “he” and “g” of the flat joint flange 32. Further, the junction point with the tunnel reinforcement 2 is set to “C” and “D” of the plane junction flange 32, and the junction point to the plane portion 1A of the floor panel of the tunnel reinforcement 2 is “H”. "Is set.

  As described above, these joint points are obtained by previously joining the tunnel reinforcement 2 to the floor panel 1 and then placing the third cross member 3 from above the floor panel 1 to lower the floor panel 1. After the third cross reinforcement 4 is installed, spot welding is performed with a welding gun.

First, as shown in FIG. 6, the third cross member 3 (tunnel junction flange 31) is directly connected to the third cross rain via the floor panel 1 (tunnel portion 1B) at the junction point “A” and “B”. reinforcement 4 is joined with the (front and rear joint flange 41, 42), the third cross-member 3, the floor panel 1, and 3 member (3 sheets) of the third cross reinforcement 4 so as to perform the bonding in It is configured.

  As shown in FIG. 7, at the joint point “C”, the third cross member 3 (plane joint flange 32) and the tunnel reinforcement 2 (plane extension part 21) are connected to the floor panel 1 (plane part 1 </ b> A). Are joined. That is, at the joint point “C”, a circular opening 44 (see FIG. 3) is formed in the third cross reinforcement 4, and three members other than the third cross reinforcement 4 are joined through the opening 44. It is configured to do.

  Further, as shown in FIG. 8, the third cross member 3 (plane joining flange 32) and the tunnel reinforcement 2 (plane extending portion 21) are also formed on the floor panel 1 (planar portion 1A) even at the joint point “d”. Are joined. That is, even at this joining point, a semicircular cutout 45 (see FIG. 3) is formed in the third cross reinforcement 4 and three members other than the third cross reinforcement 4 are joined through the cutout 45. It is configured to do.

  Next, as shown in FIG. 9, at the joining point of “e”, the third cross reinforcement 4 (extension part 43) and the tunnel reinforcement 2 (planar extension) are formed on the floor panel 1 (planar part 1A). Part 21). That is, at the joint point of “e”, a semicircular cutout 33 (see FIG. 3) is formed in the third cross member 3, contrary to the joint point of “c”, and through this cutout 33, Three members other than the third cross member 3 are joined.

  Further, as shown in FIG. 10, at the joining point of “He”, the third cross member 3 (planar surface) is connected via the floor panel 1 (planar portion 1 </ b> A), similarly to the joining point of “I” and “B”. The joining flange 32) is joined to the third cross reinforcement 4 (joining flange 42). Since there is no tunnel reinforcement 2 at this joining point, the three members of the third cross member 3, the floor panel 1, and the third cross reinforcement 4 are joined as they are.

  Finally, as shown in FIG. 11, the third cross member 3 (plane joining flange 32) is connected to the third cross reinforcement 4 (through the floor panel 1 (planar portion 1A) even at the joint point “G”. It is joined to the joining flange 41). Even at this joining point, since there is no tunnel reinforcement 2, the three members of the third cross member 3, the floor panel 1, and the third cross reinforcement 4 are joined as they are.

  As described above, since each joining point is joined every three members (three pieces) while superposing four members, it is possible to prevent the occurrence of welding failure due to defective nugget generation in spot welding.

  In the present embodiment, in particular, the tunnel reinforcement 2 is provided with the opening 5 and the three members are joined. Therefore, even when a vehicle front-rear load is applied during the vehicle front collision, the tunnel reinforcement 2 is There is no risk of opening deformation.

Further, as shown in FIG. 4, "c" of the junction points, "ho" and "the" are provided adjacent each of the junction points. Therefore, even if the third cross member 3, the third cross reinforcement 4, the tunnel reinforcement 2, and the four members of the floor panel 1 are not directly bonded, the same bonding strength as that of the direct bonding is obtained. Obtainable.

  Further, the joint points “C” to “G” are alternately offset in a staggered manner at predetermined intervals (see s1 to s4 in FIG. 4) alternately in the vehicle width direction. For this reason, when a side collision load is received, the timing at which each joint point is peeled off, and the proof strength of the vehicle body against the collision load can be increased.

As the other joining point, as shown in FIG. 3, it is set junction point "switch" for joining the floor panel 1 and the third cross reinforcement 4 at the rear side of the vehicle "ho". By setting this “h”, the third cross reinforcement 4 can be more firmly joined to the floor panel 1.

In addition, four joining points “re” to be joined to the third cross reinforcement 4 are set around the seat attachment portion 6. By providing this joining point “re”, the mounting rigidity of the seat can be increased.

  By the way, the cross member seat 13 of the floor panel 1 protrudes toward the vehicle interior side. However, as shown in FIG. 12, the cross member seat 13 is closer to the vehicle interior than the step portion 51 around the opening 5 of the tunnel reinforcement 2. It is set so that it protrudes greatly to the side.

  For this reason, when the third cross member 3 is placed from above the floor panel 1 (indicated by phantom lines), the third cross member 3 avoids interference with the periphery of the opening 5 of the tunnel reinforcement 2. The tunnel joint flange 31 of the third cross member 3 can be joined to the cross member seat portion 13.

Next, the effect of this embodiment comprised as mentioned above is explained in full detail.
The bottom body structure of the vehicle according to this embodiment forms an opening 5 in the tunnel reinforcement 2 by cutting out a portion overlapping with the third cross member 3, and the third cross member 3 is formed in the opening 5. It is joined to the third cross reinforcement 4 via the floor panel 1.

According to this configuration, the third cross member 3 and the third cross reinforcement 4 are joined via the floor panel 1 at the opening 5 formed in the tunnel reinforcement 2. Therefore, the tunnel reinforcement 2, the third cross-member 3, the third cross reinforcement 4, even beauty 4 parts member is polymerization of the floor panel 1 Oyo, it can be joined in three-ply . Further, the tunnel reinforcement 2, since only forms the opening 5, at the vehicle front collision, even when a load in the vehicle longitudinal direction is input, as in the case of providing the cutout portion, the mouth opening deformation There is also no risk of occurrence.

  Therefore, it is possible to reliably join the four members by joining the three layers while eliminating the risk of opening deformation of the tunnel reinforcement 2, and to increase the rigidity in the vicinity of the tunnel portion 1B.

In addition, although the opening part 5 of this embodiment drilled all the superposition | polymerization parts of the 3rd cross member 3, it may be comprised so that a part of superposition | polymerization part may be perforated as another structure. Good.
Further, the shape of the opening 5 is not limited to the rectangular shape as in the present embodiment, and may be a circular shape or the like.

  Further, in this embodiment, the third cross member 3 is connected via the floor panel 1 at the junction points “to” and “to” in the vehicle width direction outer position than the outer end portion of the tunnel reinforcement 2. It is joined to the third cross reinforcement 4. For this reason, the third cross member 3 is joined to the third cross reinforcement 4 via the floor panel 1 so as to straddle the tunnel reinforcement 2.

  Therefore, the third cross member 3 can directly transmit the side impact load to the third cross reinforcement 4 without interposing the tunnel reinforcement 2. Therefore, the transmissibility of the side impact load can be further improved, and the side impact safety performance of the vehicle can be improved.

  In this embodiment, the joining points “he” and “t” at the outer position in the vehicle width direction of the third cross member 3 are set so as to be offset from each other in the vehicle width direction. For this reason, when the side impact load is input, the separation points of the third cross member 3 at the outer position in the vehicle width direction are staggered at the front and rear positions, and the third cross member 3 at the time of a side collision is shifted. Separation from the floor panel 1 is suppressed, the transmissibility of the side impact load is increased, and the side impact safety performance of the vehicle can be enhanced.

  Moreover, in this embodiment, since the cross member seat part 13 which protrudes toward the vehicle interior side corresponding to the opening part 5 of the tunnel reinforcement 2 is formed on the floor panel 1, Rigidity can be made higher than that of other floor panels 1. Further, when the tunnel reinforcement 2 is assembled to the floor panel 1, the positioning can be easily performed only by aligning the opening 5 with the cross member seat 13. Therefore, the attachment rigidity of the 3rd cross member 3 can also be improved, and the assembly | attachment property to the floor panel 1 of the tunnel reinforcement 2 can also be improved.

  In this embodiment, the seat mounting portion 6 is set in the vicinity of the cross member seat portion 13 of the floor panel 1, and the bulge of the cross member seat portion 13 is formed to be continuous with the seat mounting portion 6. Yes. For this reason, the rigidity of the seat mounting part 6 can be made higher than that of the other floor panel 1, and not only the cross member seat part 13 but also the mounting rigidity of the seat mounting part 6 can be increased.

  Further, in this embodiment, since the cross member seat portion 13 and the seat mounting portion 6 are arranged side by side in the vehicle front-rear direction, the floor panel 1 is formed with a bead-shaped raised portion extending in the vehicle front-rear direction. Thus, the vehicle longitudinal rigidity of the floor panel 1 can also be increased.

  Moreover, in this embodiment, the step part 51 which protrudes toward the vehicle interior side is formed in the periphery of the opening part 5 of the tunnel reinforcement 2. For this reason, the rigidity of the periphery of the opening part 5 can be increased, the reduction in rigidity due to the formation of the opening part 5 can be compensated, and the high rigidity of the tunnel reinforcement 2 can be maintained.

  In this embodiment, the bulge of the cross member seat portion 13 of the floor panel 1 is set larger than the bulge of the step portion 51 at the periphery of the opening portion 5 of the tunnel reinforcement 2, and the cross member seat portion 13 is opened. It is set so as to be located closer to the vehicle interior side than the edge of 5. Therefore, when the third cross member 3 is placed from the upper position of the floor panel 1 and assembled to the floor panel 1, the edge of the opening 5 does not interfere with the third cross member 3, and the third cross member 3 can be assembled easily, and the third cross member 3 can be reliably joined to the cross member seat portion 13. Therefore, even if the step portion 51 is formed at the edge portion of the opening 5, the third cross member 3 can be reliably joined to the cross member seat portion 13.

  In this embodiment, a notch 45 and an opening 44 are formed at the outer end of the third cross reinforcement 4 in the vehicle width direction, and the third cross member 3 is formed at the notch 45 and the opening 44. Are joined to the floor panel 1 via a tunnel reinforcement 2. For this reason, the outer end portion in the vehicle width direction of the tunnel reinforcement 2 is securely joined to the floor panel 1 and the third cross member 3, and is prevented from being lifted and separated from the floor panel 1 at the time of a side collision of the vehicle. . Therefore, the side collision response force of the tunnel reinforcement 2 can be increased, and the side collision safety performance of the vehicle can be further improved.

Incidentally, 45 and the opening 44 this notch, unless invited reduction in rigidity of the third cross reinforcement 4, be any shape, it may also be provided one go. Moreover, you may provide only one side.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The tunnel reinforcing member of the present invention corresponds to the tunnel reinforcement 2,
Similarly,
The cross member corresponds to the third cross member 3,
The cross member reinforcement member corresponds to the third cross reinforcement 4,
The in-vehicle equipment mounting part corresponds to the seat mounting part 6,
The present invention is not limited to the above-described embodiment, but includes an embodiment applied to the bottom body structure of any vehicle.

  In addition, although not specifically illustrated as another embodiment, for example, a tunnel reinforcement may be configured by a member-shaped member extending linearly.

1 is an overall perspective view of a vehicle body floor in which the present invention is adopted. The disassembled perspective view of each member which comprises a vehicle body floor. The detailed perspective view of a junction part. The top view of a junction part. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3. FIG. 5 is a cross-sectional view taken along line CC in FIG. 4. The DD sectional view taken on the line of FIG. FIG. 5 is a cross-sectional view taken along line EE in FIG. 4. FIG. 5 is a cross-sectional view taken along line FF in FIG. 4. FIG. 5 is a cross-sectional view taken along line GG in FIG. 4. FIG. 5 is a cross-sectional view taken along line HH in FIG. 4.

DESCRIPTION OF SYMBOLS 1 ... Floor panel 1A ... Plane part 1B ... Tunnel part 2 ... Tunnel reinforcement (tunnel reinforcement member)
3 ... Third cross member (cross member)
4. Third cross reinforcement (cross member reinforcement member)
5 ... Opening 6 ... Seat mounting part (vehicle equipment mounting part)
12 ... Tunnel side surface 13 ... Cross member seat 44 ... Opening 45 ... Notch 51 ... Step

Claims (7)

A floor panel of a vehicle has a flat portion and a tunnel portion bulging upward so as to extend in the vehicle front-rear direction at a substantially central position in the vehicle width direction, and the flat portion from above the tunnel portion is formed on the floor panel. And a left and right cross member extending from the tunnel portion to the outer side in the vehicle width direction and disposed below the floor panel and extending in the vehicle width direction. A bottom body structure of a vehicle in which a cross member reinforcing member that connects the left and right cross members via a panel is disposed,
In the tunnel reinforcing member, an opening is formed by cutting out a portion overlapping with the cross member,
In the opening, the cross member is joined to the cross member reinforcing member via a floor panel ,
The cross member is joined to the cross member reinforcing member via the floor panel at a position outside the vehicle width direction outer end of the tunnel reinforcing member in the vehicle width direction,
The opening is formed corresponding to the side surface of the tunnel portion;
The cross member is joined to the side surface of the tunnel portion in the opening, and is formed of a member member extending outward in the vehicle width direction with a substantially hat-shaped cross section opening downward from the side of the tunnel portion in the opening.
The cross member reinforcing member is joined to the vehicle outer side surface of the side surface portion of the tunnel portion corresponding to the opening portion, and in the vehicle width direction so as to be joined to the left and right cross members through the floor panel in the shape of a cross-section hat opened upward. A bottom body structure of a vehicle constituted by an extending member member . A floor panel of a vehicle has a flat portion and a tunnel portion bulging upward so as to extend in the vehicle front-rear direction at a substantially central position in the vehicle width direction, and the flat portion from above the tunnel portion is formed on the floor panel. And a left and right cross member extending from the tunnel portion to the outer side in the vehicle width direction and disposed below the floor panel and extending in the vehicle width direction. A bottom body structure of a vehicle in which a cross member reinforcing member that connects the left and right cross members via a panel is disposed,
In the tunnel reinforcing member, an opening is formed by cutting out a portion overlapping with the cross member,
In the opening, the cross member is joined to the cross member reinforcing member via a floor panel,
The cross member reinforcing member is extended to the vehicle width direction outer side position than the opening of the tunnel reinforcing member of the floor panel, and
A notch or an opening is formed on the outer end portion of the cross member reinforcing member at the outer side in the vehicle width direction than the opening of the tunnel reinforcing member of the floor panel,
A vehicle body structure at the bottom of a vehicle in which a cross member is joined to a floor panel via a tunnel reinforcing member at the notch or opening . A floor panel of a vehicle has a flat portion and a tunnel portion bulging upward so as to extend in the vehicle front-rear direction at a substantially central position in the vehicle width direction, and the flat portion from above the tunnel portion is formed on the floor panel. And a left and right cross member extending from the tunnel portion to the outer side in the vehicle width direction and disposed below the floor panel and extending in the vehicle width direction. A bottom body structure of a vehicle in which a cross member reinforcing member that connects the left and right cross members via a panel is disposed,
In the tunnel reinforcing member, an opening is formed by cutting out a portion overlapping with the cross member,
In the opening, the cross member is joined to the cross member reinforcing member via a floor panel,
On the floor panel, a cross member seat that protrudes toward the vehicle interior side corresponding to the opening of the tunnel reinforcing member is formed,
In the vicinity of the cross member seat of the floor panel, set the in-vehicle equipment mounting part,
The vehicle body structure at the bottom of the vehicle, wherein the cross member seat is formed so that the bulge of the cross member seat is continuous with the in-vehicle equipment mounting portion . A floor panel of a vehicle has a flat portion and a tunnel portion bulging upward so as to extend in the vehicle front-rear direction at a substantially central position in the vehicle width direction, and the flat portion from above the tunnel portion is formed on the floor panel. And a left and right cross member extending from the tunnel portion to the outer side in the vehicle width direction and disposed below the floor panel and extending in the vehicle width direction. A bottom body structure of a vehicle in which a cross member reinforcing member that connects the left and right cross members via a panel is disposed,
In the tunnel reinforcing member, an opening is formed by cutting out a portion overlapping with the cross member,
In the opening, the cross member is joined to the cross member reinforcing member via a floor panel,
On the floor panel, a cross member seat that protrudes toward the vehicle interior side corresponding to the opening of the tunnel reinforcing member is formed,
The vehicle body structure at the bottom of a vehicle, wherein the edge of the opening of the tunnel reinforcing member is formed so as to protrude toward the vehicle interior side . A floor panel of a vehicle has a flat portion and a tunnel portion bulging upward so as to extend in the vehicle front-rear direction at a substantially central position in the vehicle width direction, and the flat portion from above the tunnel portion is formed on the floor panel. And a left and right cross member extending from the tunnel portion to the outer side in the vehicle width direction and disposed below the floor panel and extending in the vehicle width direction. A bottom body structure of a vehicle in which a cross member reinforcing member that connects the left and right cross members via a panel is disposed,
In the tunnel reinforcing member, an opening is formed by cutting out a portion overlapping with the cross member,
In the opening, the cross member is joined to the cross member reinforcing member via a floor panel,
Extending the cross member reinforcing member to a position where it overlaps with the flat portion of the floor panel,
Forming a notch or an opening in the outer end of the cross member reinforcing member at a portion overlapping with the flat portion of the floor panel,
A vehicle body structure at the bottom of a vehicle in which a cross member is joined to a floor panel via a tunnel reinforcing member at the notch or opening . A plurality of joint points with the cross member reinforcing member at the vehicle width direction outer position of the cross member are set in the vehicle front-rear position,
The bottom body structure of a vehicle according to claim 1 or 2, wherein the joint points are set to be offset from each other in the vehicle width direction . The vehicle according to any one of claims 1, 2, and 6 , wherein a cross member seat portion is formed on the floor panel so as to protrude toward the vehicle interior side in correspondence with the opening of the tunnel reinforcing member . the bottom of the vehicle body structure.

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