JP5699584B2 - Underbody structure for vehicles - Google Patents

Description

  The present invention relates to a vehicle underbody structure that constitutes a lower portion of a vehicle.

  The underbody is a lower area of the entire vehicle that includes a floor and the like. The underbody is the basic structure of the vehicle and is important for ensuring the rigidity of the vehicle. The main members included in the underbody are a plate-like panel portion that is a floor material, a side member that is attached to a side edge of the panel portion in the vehicle width direction, and a cross member that is attached to the panel portion in the vehicle width direction. It is. By combining these members, the strength and rigidity of the vehicle are increased.

  The current vehicle tends to have a passenger compartment (a space ahead of the rear seat) wider than before in order to improve occupant convenience. In such a vehicle, the panel portion below the passenger compartment is often lowered to the vicinity of the road surface. Since the fuel tank is usually attached to the lower side of the panel near the rear seat, the panel is raised from the vicinity of the rear seat toward the rear and becomes higher, and bends near the trunk behind the rear seat. It is almost horizontal. Such a shape of the panel portion is also reflected in the shape of the side member described above.

  When the vehicle receives an impact, the load tends to concentrate on the bent portion (bent portion) of the panel portion and the side member as described above. Thus, for example, in the vehicle rear structure of Patent Document 1, a reinforcement (reinforcing member) is provided inside the bent portion of the side member. In Patent Document 1, the reinforcement is installed so as to extend in the longitudinal direction inside the side member, and in this way, the load from the rear of the vehicle can be particularly efficiently absorbed.

JP 2010-18052 A

  However, in the configuration using the reinforcement as in Patent Document 1, there is a possibility that a significant cost increase may be caused, for example, a new die for producing the reinforcement is required. In particular, the reinforcement is formed with a flange in contact with the inside of the side member. Such a flange has a complicated shape, and high molding accuracy is required to bring the flange into contact with the inside of the side member. Therefore, the manufacturing cost of reinforcement is not low.

  In view of such problems, an object of the present invention is to provide an underbody structure for a vehicle that can improve strength and rigidity with a simple configuration with reduced costs.

  In order to solve the above problems, a typical configuration of the vehicle underbody structure according to the present invention is a vehicle underbody structure that constitutes a lower portion of the vehicle, and is a vehicle floor plate, and its gradient changes before and after the vehicle. Any of a panel portion having a bent portion bent so as to be bent, a plurality of side members attached in the vehicle front-rear direction along a side edge of the panel portion, and a plurality of side members attached to the lower side of the panel portion in the vehicle width direction A plurality of cross members coupled to each other, the plurality of side members including a front side member whose rear end reaches at least the bent portion and a rear side member whose front end reaches the front of the bent portion. The front side member and the rear side member are connected to each other in an overlapping region.

  According to the said structure, the intensity | strength and rigidity of a bending part can be improved with the simple structure using the existing member. Therefore, the manufacturing cost can be reduced as compared with the case where another member such as reinforcement is used. Moreover, the side member extended from the vehicle rear among the side members which overlap in the bending part is the structure extended in front of the bending part in other words. Thereby, the bending part is reinforced by the two side members overlapping, and deformation of the bending part can be suppressed.

  The plurality of cross members include a front cross member installed at the front of the bent portion of the vehicle and a rear cross member installed at the rear of the bent portion of the vehicle, and the front end of the rear side member is viewed from the side of the vehicle. It is good to extend to the front cross member.

  According to the above configuration, particularly when a load is applied from the rear of the vehicle, the load is distributed from the rear side member to the front cross member. Thereby, concentration of the load on the bent portion can be prevented, and deformation of the bent portion can be efficiently suppressed.

  The vehicle underbody structure may further include a suspension mounting portion that is installed in a region where the front side member and the rear side member overlap. By attaching the suspension to a portion having high strength and rigidity, vibration generated during traveling can be efficiently absorbed, and traveling stability and riding comfort can be improved.

  According to the above configuration, it is possible to provide an underbody structure for a vehicle that can improve strength and rigidity with a simple configuration with reduced costs.

1 is a diagram showing a vehicle to which a vehicle underbody structure according to an embodiment of the present invention is applied. It is a figure which shows the underbody structure for vehicles of FIG. 1 from the vehicle left side. It is a figure which shows the side member of FIG. 1 from each direction.

  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.

  FIG. 1 is a view showing a vehicle 102 to which a vehicle underbody structure 100 according to an embodiment of the present invention is applied. FIG. 1 shows the vehicle 102 from below. Therefore, the left-right direction of the vehicle 102 in FIG. 1 is opposite to the actual left-right direction.

  A vehicle underbody structure 100 shown in FIG. 1 is a part constituting a lower portion (a floor or a bottom surface) of a vehicle 102. The vehicle underbody structure 100 includes a panel portion 104 that is a floor plate, a cross member 106 that is attached to the lower side (bottom surface) of the panel portion 104 in the vehicle width direction, and a side edge in the vehicle width direction of the panel portion 104. Side members 108 are included.

  FIG. 2 is a side view of the vehicle underbody structure 100 of FIG. In FIG. 2, the side edge of the panel portion 104 on the left side of the vehicle is viewed laterally through the side member 108. The panel unit 104 includes a floor panel 104a in front of the vehicle and a rear panel 104b in the rear. The floor panel 104 a is a floor board in the passenger compartment that is a space in front of the rear seat 105. The rear panel 104b is installed behind the floor panel 104a and mainly functions as a floor board in the trunk portion.

  A fuel tank 110, a suspension 112 of the rear wheel 114, and the like are disposed below the rear panel 104b (see FIG. 3A). Therefore, the rear panel 104b is inclined and becomes higher from the rear seat vicinity toward the rear, and is bent (bent portion E1) in front of the trunk portion and extends substantially horizontally. Thus, the bent portion E1 is provided to change the gradient of the panel portion 104 in the longitudinal direction of the vehicle. The bent portion E1 is formed in the panel portion 104 over the vehicle width direction, and is a portion where load is concentrated and easily deformed when an impact is applied to the vehicle 102.

  A cross member 106 shown in FIG. 1 is a member that reinforces the panel portion 104, and a plurality of cross members 106 are attached. In the present embodiment, the first cross member 106a near the boundary between the floor panel 104a and the rear panel 104b, the second cross member 106b as the front cross member in front of the bent portion E1 (see FIG. 2), and the bent portion E1 A third cross member 106c is attached to the rear of the vehicle as a rear cross member.

  The first cross member 106a is coupled to the first side member 108a. Both the second cross member 106b and the third cross member 106c are coupled to the second side member 108b. Each cross member and each side member are joined together mainly by welding. A fuel tank 110 is attached to the first cross member 106a and the second cross member 106b, and a lateral rod 116 of the rear wheel 114 is attached to the third cross member 106c as shown in FIG.

  The side members 108 are members that reinforce the side edges of the panel portion 104, and a plurality of side members 108 are attached in the vehicle front-rear direction. In the present embodiment, the side member 108 is mainly attached to the rear panel 104b, and a total of three side members, a first side member 108a to a third side member 108c, are arranged from the front of the vehicle.

  FIG. 3 is a view showing the side member 108 of FIG. 1 from each direction. FIG. 3A is a side view of the side member 108 corresponding to FIG. In FIG. 3A, a part of the side member 108 is shown in a transparent manner.

  As shown in FIG. 3A, the side members are arranged so as to partially overlap each other. Of the side members 108, the shape of the second side member 108b is formed in accordance with the shape of the bent portion E1 of the rear panel 104b (see FIG. 2). The second side member 108b is installed as a front side member disposed mainly in the front side in the vicinity of the bent portion E1. The second side member 108b, which is the front side member, is installed such that the rear end 109b reaches at least the bent portion E1. In the present embodiment, the rear end 109b extends rearward from the bent portion E1.

  The third side member is installed as a rear side member disposed mainly on the rear side in the vicinity of the bent portion E1. The third side member 108c, which is the rear side member, is installed so that at least the front end 109c reaches the front of the bent portion E1. In the present embodiment, the front end 109c extends to the second cross member 106b, which is a front cross member, as viewed from the side of the vehicle in FIG.

  FIG. 3B is a perspective view showing the side member 108 of FIG. Also in FIG. 3B, a part of the side member 108 is shown in a transparent manner. In addition, the panel part 104 is abbreviate | omitted in FIG.3 (b).

  As shown in FIG. 3B, the side member 108 has a hat shape with an upper opening. The third side member 108c overlaps the inside of the hat shape of the second side member 108b, and is welded and connected to the second side member 108b in this overlapping region. Further, the second side member 108b overlaps the inside of the hat shape of the first side member 108a and is connected to the first side member 108a by welding.

  In the present embodiment, as shown in FIG. 3A, the second side member 108b and the third side member 108c are overlapped in a region before and after the bent portion E1, particularly in a region extending forward from the bent portion E1. It is connected. Thereby, the strength and rigidity of the bent portion E1 are improved, and deformation of the bent portion E1 is prevented.

  More specifically, first, the front end 109c of the third side member 108c extends forward from the bent portion E1. The third side member 108c extends rearward from the second side member 108b. If a load is applied to the vehicle 102 from behind, the load is likely to concentrate at a location where the shape has changed, such as the bent portion E1. This causes deformation in the bent portion E1. However, in this embodiment, the load applied from the rear is received by the third side member 108c (rear side member) and the second side member 108b (front side member) at the bent portion E1. Therefore, deformation of the bent portion E1 can be suppressed.

  In particular, when the deformation is suppressed, the front end 109c of the third side member 108c extends to the second cross member 106b (front cross member) installed in front of the bent portion E1 in the vehicle. In the present embodiment, as shown in FIG. 3A, the front end 109c of the third side member 108c overlaps a part of the second cross member 106b when viewed from the side of the vehicle. The vicinity of the front and rear center of the third side member 108c overlaps the third cross member 106c (rear cross member). As a result, the load from the rear of the vehicle is distributed to and absorbed by the third cross member 106c and the second cross member 106b through the third side member 108c. According to this configuration, the deformation of the bent portion E1 can be suppressed more efficiently. In order to distribute the load to the second cross member 106b, the front end 109c of the second side member 108b only needs to extend to at least the vicinity of the second cross member 106b. This can also suppress deformation of the bent portion E1.

  Further, in the vehicle underbody structure 100, a suspension attachment portion 118 for attaching the suspension 112 of the rear wheel 114 is provided in a region (region E2) where the second side member 108b and the third side member 108c overlap. This region E1 has high strength and rigidity, and in the region E1, vibrations and loads from the suspension 112 can be evenly distributed in the vehicle front-rear direction via the second side member 108b and the third side member 108c. That is, vibration generated on the rear wheel 114 (see FIG. 1) during traveling can be efficiently absorbed. Therefore, improvement in running stability and riding comfort can be achieved.

  As described above, according to the underbody structure 100 for a vehicle, the strength and rigidity of the bent portion E1 can be improved with a simple configuration using existing members. Therefore, the manufacturing cost can be reduced as compared with the case where another member such as reinforcement is used.

  In the present embodiment, a plurality of cross members and a plurality of side members are each attached, but this quantity can be changed as appropriate.

  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.

  INDUSTRIAL APPLICABILITY The present invention can be used as a vehicle underbody structure that forms a lower portion of a vehicle.

E1 ... Bent part, E2 ... Area, 100 ... Underbody structure for vehicle, 102 ... Vehicle, 104 ... Panel part, 104a ... Floor panel, 104b ... Rear panel, 105 ... Rear seat, 106 ... Cross member, 106a ... First cross Member 106b 2nd cross member 106c 3rd cross member 108 108 Side member 108a 1st side member 108b 2nd side member 108c 3rd side member 109b Rear end 109c Front end , 110 ... Fuel tank, 112 ... Suspension, 114 ... Rear wheel, 116 ... Lateral rod, 118 ... Suspension mounting part

Claims (3)

In the vehicle underbody structure that forms the lower part of the vehicle,
A panel of a vehicle floor plate having a bent portion bent so that the gradient changes before and after the vehicle;
A plurality of side members that are attached in the vehicle front-rear direction along the side edges of the panel portion , each having an open top ,
A plurality of cross members attached to the lower side of the panel portion over the vehicle width direction and coupled to any of the plurality of side members;
The plurality of side members include a front side member whose rear end reaches at least the rear of the bent portion, and a rear side member whose front end reaches the front of the bent portion,
Said front side member and said rear side member, said over the front and rear of the bent portion, and overlap the other inside the one of the opening, a vehicle under-characterized by being connected to one another in the region where both overlap Body structure. The plurality of cross members include a front cross member installed on the vehicle front side of the bent portion, and a rear cross member installed on the vehicle rear side of the bent portion,
The underbody structure for a vehicle according to claim 1, wherein a front end of the rear side member extends to the front cross member in a vehicle side view.   The underbody structure for a vehicle according to claim 1, further comprising a suspension mounting portion installed in a region where the front side member and the rear side member overlap.

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