JP2012131373A - Peripheral structure of main floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a peripheral structure of a main floor that disperses an impact force when a collision occurs in the front of a vehicle body so as to prevent the breakage of a floor side member.SOLUTION: The peripheral structure of a main floor has: a pair of right and left floor side members 113 extending in the vehicle-body front-rear direction on the lower surface of a main floor panel 110; and a cross member 114 extending in the vehicle width direction and arranged on the upper surface of the main floor panel 110. The floor side member 113 has two sidewalls 1132, 1133 and a lower surface wall 1131, and two flanges 1134, 1135. The cross member 114 has two sidewalls 1142, 1143 and an upper surface wall 1141, and two flanges 1144, 1145. The respective flanges of the floor side member 112 and the cross member 114 are integrally joined to each other across the main floor panel 110.

Description

  The present invention relates to a main floor peripheral structure having a main floor panel constituting a bottom portion of a vehicle body.

  Of the collision accidents that occur in vehicles, it has been found that there are many collisions that are slightly shifted to the left or right rather than from the front. Such a collision is called an offset collision. In frontal collision, the impact force is absorbed by the entire front surface of the vehicle, but in offset collision, the impact force is concentrated on either the left or right side of the front surface, so that the vehicle receives more damage. In recent vehicles, it is common to design the strength and shock absorption of the vehicle body assuming this offset collision.

  For example, if the floor side member arranged on the lower side of the main floor panel that forms the bottom of the vehicle body breaks during an offset collision to the front of the vehicle body, the amount of retraction of the dash panel increases. The occupants are also affected a little.

  Conventionally, in order to prevent the floor side member from being broken, countermeasures have been taken by adding reinforcing parts to the floor side member or increasing the thickness of the component parts themselves. However, when reinforcing parts are added, there is a limit to the number of panels, and when the plate thickness is increased, the weight of the vehicle body increases.

  On the other hand, for example, in Patent Document 1, the rear part of the kick part of the pair of left and right side members extending in the longitudinal direction of the vehicle body is bent inward in the vehicle width direction and in the vicinity of the joint part between the tunnel part of the front panel and the cross member. The technology linked to is disclosed.

  Thereby, the collision load received by the collision side member of the pair of left and right side members at the time of the vehicle offset front collision can be effectively distributed to the tunnel portion and the cross member.

  Also, for example, in Patent Document 2, a U-shaped reinforcing member is provided along the vehicle width direction in a cross member extending in the vehicle width direction, and a joint portion of the reinforcing member is installed on the lower surface side of the floor panel. A technique of joining the rear end portion of the front floor frame is disclosed. Thus, it is claimed that the rear end portion of the front floor frame can be stably supported.

JP 2004-314663 A JP-A-6-171551

  However, in Patent Document 1, since the rear portions of the pair of left and right side members are bent inward to alleviate the collision load, a layout change occurs in other related members, and the design change cannot be avoided. . In addition, since the rear portions of the pair of left and right side members are bent inward in the vehicle width direction and connected to the vicinity of the connecting portion between the front panel and the cross member, a great amount of work is required, resulting in an increase in manufacturing cost.

  In addition, Patent Document 2 newly adds a reinforcing member extending in the vehicle width direction. However, the effect of preventing the collapse against a lateral load is small, and the addition of the reinforcing member increases the number of panels. The number of parts increases and the manufacturing cost increases.

  In view of such a problem, the present invention distributes the impact force received by the vehicle body from the floor side member to the cross member at the time of a collision with the front of the vehicle body while avoiding an increase in manufacturing cost, and the floor side member is bent. An object of the present invention is to provide a structure around the main floor that can suppress the above.

  In order to solve the above-described problems, a typical configuration of the main floor peripheral structure according to the present invention includes a main floor panel that forms the bottom of the vehicle body, and a pair of left and right that is disposed on the lower surface of the main floor panel and extends in the vehicle body longitudinal direction. In a main floor peripheral structure having a floor side member and a cross member extending in the vehicle width direction so as to intersect with the floor side member and arranged on the upper surface with the main floor panel interposed therebetween, each of the floor side members is opposed to each other Two side walls, a lower surface wall connecting the lower end portions of the two side walls, and two flange portions extending outward from the upper end portions of the two side walls, respectively, and the cross member has two side walls facing each other And an upper wall connecting the upper ends of the two side walls, and two flanges extending outward from the lower ends of the two side walls, respectively. And, the flange portion of the floor side member and the cross member is characterized by being integrally joined across the main floor panel.

  According to the above configuration, each of the floor side members extending in the longitudinal direction of the vehicle body and the cross member extending in the vehicle width direction intersect with each other, and are merely joined together at this intersection. While avoiding, for example, the impact force received by the vehicle body at the time of an offset collision with the front portion of the vehicle body is transmitted from the floor side member to the cross member at the intersection. Thus, since the impact force to the vehicle body is distributed from the floor side member to the cross member, the folding of the floor side member is effectively suppressed.

  The cross member may further include a first reinforcing member that connects the two side walls of the cross member at a position where the cross member intersects the floor side member. With this configuration, when the force from the floor side member is transmitted to the cross member, the cross member is not crushed by the first reinforcing member, and the rigidity of the cross member can be improved.

  Furthermore, the floor side member may further include a second reinforcing member that connects the two side walls of the floor side member over a range in front of the vehicle rather than a position where the floor side member intersects. With the above configuration, the second reinforcing member can be efficiently disposed in the gap portion in the floor side member, and the rigidity of the floor side member can be increased.

  According to the present invention, it is possible to suppress the folding of the floor side member by dispersing the impact force received by the vehicle body at the time of a collision with the front part of the vehicle body from the floor side member to the cross member while avoiding an increase in manufacturing cost. A possible main floor peripheral structure can be provided.

It is a perspective view of the main floor periphery structure of this embodiment. It is a disassembled perspective view of the main floor periphery structure of FIG. FIG. 3 is a view in the direction of arrow III in FIG. 2. It is sectional drawing which follows the IV line of FIG. It is the perspective view which expanded the A point vicinity of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified.

  In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do. Further, in the present embodiment, for convenience of explanation, “upper” is vertically upward, “lower” is vertically downward, and “left and right” is the vehicle width direction.

  FIG. 1 is a schematic perspective view of the peripheral structure of the main floor of the present embodiment. In FIG. 1, a vehicle body 101 and an engine room 102 are partitioned by a dash panel 104 at the front of the vehicle body. Further, both ends of the dash panel 104 in the vehicle width direction are fixed to the dash side panels 106 and 107 by welding. The rear portions of the dash side panels 106 and 107 are connected to a pair of left and right side sills 108 and 109 extending in the longitudinal direction of the vehicle body, respectively.

  The main floor peripheral structure 100 of the present embodiment includes a main floor panel 110 that forms the bottom of the vehicle body, a pair of left and right floor side members 112 and 113 disposed on the lower surface of the main floor panel 110, and the main floor panel 110. And a cross member 114 disposed on the upper surface thereof. For convenience, the external appearance of the main floor panel 110 is not shown in FIG.

  The pair of left and right floor side members 112 and 113 are disposed on the inner side in the vehicle width direction than the side sills 108 and 109. The floor side members 112 and 113 extend in the longitudinal direction of the vehicle body. Front portions of the floor side members 112 and 113 are extended in the engine room 102. The floor side members 112 and 113 are connected to the lower surface of the main floor panel 110 through the lower inclined portions (which are inclined surfaces) 116 and 117 of the dash panel 104.

  The cross member 114 extends in the vehicle width direction so as to intersect the floor side members 112 and 113 at two intersections (point A and point B). In this embodiment, the cross member 114 intersects the floor side members 112 and 113 at two intersections (points A and B) substantially at a right angle. However, since the configuration of these two intersections (point A and point B) is the same, in the present embodiment, only the point A where the floor side member 113 and the cross member 114 on the right side in the vehicle width direction intersect will be described. .

  FIG. 2 is an exploded perspective view of the structure around the main floor of FIG. In the present embodiment, as shown in FIG. 2, each of the floor side members 113 includes side walls 1132 and 1133 that face each other, a lower wall 1131 that connects the lower ends of the two side walls 1132 and 1133, and two Two flange portions 1134 and 1135 extending outward from the upper ends of the side walls 1132 and 1133 are provided. That is, the floor side member 113 has a substantially hat-shaped cross section (rectangular wave shape) opened upward.

  The cross member 114 has two side walls 1142 and 1143 that face each other, an upper surface wall 1141 that connects upper ends of the two side walls 1142 and 1143, and an outer side from the lower ends of the two side walls 1142 and 1143, respectively. There are two flange portions 1144 and 1145 extending. That is, the cross member 114 has a substantially hat-shaped cross section (rectangular wave shape) opened downward.

  Further, in the present embodiment, the flange portions 1134, 1135, 1144, 1145 of the floor side member 113 and the cross member 114 are integrally joined with the main floor panel 110 interposed therebetween. Specifically, the flange portion 1134, the main floor panel 110, and the flange portions 1144 and 1145 are integrally joined by spot welding at points a and e, and points b and g. Yes.

  Similarly, three pieces of the flange portion 1135, the main floor panel 110, and the flange portions 1144 and 1145 are integrally joined by spot welding at points c and f, and points d and h. The joining method is not limited to spot welding, but may be joining with bolts, rivets, or the like.

  According to the present embodiment, since the floor side member 113 and the cross member 114 are integrally joined with the main floor panel 110 at the point A, for example, at the time of an offset collision with the front part of the vehicle body, the impact force is The floor side member 113 is transmitted to the cross member 114 via the point A. As described above, the impact force received by the vehicle body is also distributed to the cross member 114, so that the folding of the floor side member 113 can be effectively suppressed.

  In particular, in the present embodiment, the floor side member 113 and the cross member 114 are set to have a cross section in a direction orthogonal to each other, so that a load is applied to the other member with respect to an impact force from the direction orthogonal to each other. Can be dispersed to relieve stress.

  Thus, according to the present embodiment, the impact force transmitted from the floor side member 113 is also distributed to the cross member 114 and the folding of the floor side member 113 is suppressed. Thus, the safety of passengers in the passenger compartment can be ensured.

  Further, in the present embodiment, the flange portions 1134 and 1135 of the floor side member 113 and the flange portions 1144 and 1145 of the cross member 114 are joined by sandwiching the main floor panel 110 by spot welding. It is possible to fix it integrally in a state where it is positioned in the position, and workability can be improved. Moreover, no significant layout changes are required.

  Next, in the present embodiment, the cross member 114 has a first reinforcing member 120 that connects the two side walls 1142 and 1143 of the cross member 114 at a point A that is a position that intersects the floor side member 113. ing.

  3 is a view taken in the direction of arrow III in FIG. 2, and FIG. 4 is a cross-sectional view taken along line IV in FIG. The first reinforcing member 120 has a main body portion 1201 having a substantially rectangular cross section when viewed from the front, and two flange portions 1202 and 1203 extending along the side walls 1142 and 1143 respectively from the left and right end portions thereof. . The material of the first reinforcing material 120 is made of metal, for example. The flange portions 1202 and 1203 are integrally joined to the side walls 1142 and 1143, respectively. In this embodiment, it joins by spot welding. In FIG. 4, the points p and q indicate the joint locations by spot welding.

  Further, the first reinforcing member 120 is only integrally joined to the side walls 1142 and 1143 of the cross member 114, and is not joined to the floor side member 113. This is because the first reinforcing member 120 is provided to prevent the cross member 114 from being crushed by receiving a lateral load.

  The joining method is not limited to spot welding, but may be joining with bolts, rivets, or the like. For example, when the first reinforcing material 120 is not a metal such as a synthetic resin, a joining method using bolts, rivets, or the like can be employed. Further, in the present embodiment, the case where the first reinforcing material 120 is connected to the point A which is an intersection has been described. For example, a plurality of the first reinforcing materials 120 are provided not only at the point A but also at portions other than the point A. It may be connected individually.

  According to the present embodiment, when the impact force from the floor side member 113 is transmitted to the cross member 114 due to an offset collision with the front of the vehicle body or the like, the first reinforcing member 120 is attached to the two side walls of the cross member 114. Since 1142 and 1143 are connected, it can suppress that the cross member 114 is crushed. Thus, the rigidity and strength of the cross member 114 can be improved. Accordingly, the rigidity of the floor side member 113 integrally joined to the cross member 114 can also be improved.

  Further, in the present embodiment, the floor side member 113 connects the two side walls 1132 and 1133 of the floor side member 113 over a range in front of the vehicle with respect to the position (point A) that intersects the cross member 114. A reinforcing member 130 is further provided. In the present embodiment, the second reinforcing member 130 is provided from the position below the dash panel 104 to the point A on the inner side of the floor side member 113 in the vehicle longitudinal direction.

  FIG. 5 is an enlarged perspective view of the vicinity of point A in FIG. Also in FIG. 5, the external appearance of the main floor panel 110 is not shown.

  The second reinforcing member 130 includes a block-shaped main body portion 1301 extending in the vehicle body width direction, and a flange portion 1302 extending along the side wall 1133 of the floor side member 113 from its left and right end portions. The material of the second reinforcing material 130 is made of metal, for example. The flange portion 1302 is integrally joined to the side wall 1133. In the present embodiment, a plurality of second reinforcing members 130 are juxtaposed in the longitudinal direction of the vehicle body in the floor side member 113, and these are integrally joined to the side wall 1133 by spot welding.

  However, the joining method is not limited to spot welding, but may be joining with bolts, rivets, or the like. In the present embodiment, the case where the flange portion 1302 is erected from the left and right end portions of the main body portion 1301 in the shape of the second reinforcing member 130 has been described, but the present invention is not limited thereto. For example, a shape in which two flange portions are erected from both left and right end portions of the main body portion 1301 may be used.

  When the two flange portions are erected, each flange portion is integrally joined to the side walls 1132 and 1133 of the floor side member 113, respectively. Furthermore, as described above, when the second reinforcing member 130 is not a metal such as a synthetic resin, a joining method using bolts, rivets, or the like can be employed.

  According to the present embodiment, since the plurality of second reinforcing members 130 are disposed and integrally joined to the gap portion in the floor side member 113, the floor side member 113 can be disposed efficiently. The rigidity and strength can be increased. In the present embodiment, the case where the second reinforcing member 130 is disposed in the floor side member 113 has been described. Similarly, the second reinforcing member 130 is disposed in the side sills 108 and 109 (see FIG. 1) on the left and right sides of the vehicle body. You can also.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention can be used for a main floor peripheral structure having a main floor panel constituting the bottom of a vehicle body.

DESCRIPTION OF SYMBOLS 100 ... Main floor periphery structure, 101 ... Car compartment, 102 ... Engine room, 104 ... Dash panel, 110 ... Main floor panel, 112 ... Floor side member, 113 ... Floor side member, 1131 ... Bottom wall, 1132 ... Side wall, 1133 ... side wall, 1134 ... flange part, 1135 ... flange part, 114 ... cross member, 1141 ... top wall, 1422 ... side wall, 1143 ... side wall, 1144 ... flange part, 1145 ... flange part, 120 ... first reinforcing material, 1201 ... Body part 1202 ... Flange part 1203 ... Flange part 130 ... Second reinforcing material 1301 ... Main body part 1302 ... Flange part A point ... Intersection, B point ... Intersection

Claims (3)

A main floor panel constituting a bottom portion of the vehicle body, a pair of left and right floor side members disposed on a lower surface of the main floor panel and extending in the vehicle longitudinal direction, and the main floor extending in the vehicle width direction so as to intersect the floor side member In the main floor peripheral structure having a cross member arranged on the upper surface across the panel,
Each of the floor side members has two side walls facing each other, a lower wall connecting the lower end portions of the two side walls, and two flange portions extending outward from the upper end portions of the two side walls. And
The cross member has two side walls that face each other, an upper surface wall that connects upper ends of the two side walls, and two flange portions that extend outward from the lower ends of the two side walls, respectively.
The main floor peripheral structure, wherein the flange portions of the floor side member and the cross member are integrally joined with the main floor panel interposed therebetween.   2. The main floor peripheral structure according to claim 1, wherein the cross member further includes a first reinforcing member that connects between two side walls of the cross member at a position where the cross member intersects the floor side member.   3. The floor side member further includes a second reinforcing member that connects between two side walls of the floor side member over a range in front of the vehicle rather than a position intersecting the cross member. 4. Main floor surrounding structure as described in.

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