JP2013067235A - Vehicle body frame structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body frame structure capable of reducing weight while suppressing deformation by improving collision performance and of favorably fixing other members on a frame member by bolts.SOLUTION: Nuts 81 and a base material 62 are formed as one body in a structure in which other members 50 are fixed on a frame member 24 by installing a reinforcing member 60 composed of a base material 62 and a filling member 61 made of a thermoset foam filler inside a frame member 24 that constitutes a vehicle frame and fastening bolts 80 to the nuts 81 placed inside the frame member 24 from outside of the frame member 24.

Description

  The present invention relates to a vehicle body frame structure provided under a vehicle floor.

  Since the body frame provided under the floor of a vehicle such as an automobile forms a skeleton of the vehicle, it is necessary to ensure a sufficiently high strength. Conventionally, for example, the strength of the body frame has been increased by joining a reinforcing member to a predetermined position of the body frame by spot welding or the like. Although this can improve the strength of the body frame, there is a problem that the weight of the vehicle increases.

  Further, in order to suppress deformation of the body frame, there is one in which a closed cross-sectional space between an outer panel constituting the body frame and a reinforcing member disposed inside the outer panel is filled with a foamed resin material (for example, , See Patent Documents 1 and 2).

Japanese Patent No. 3525890 JP 2009-120161 A

  Incidentally, other members such as various brackets may be fixed to a frame member such as an outer panel constituting such a vehicle body frame. This other member is fixed to the frame member by, for example, a bolt and a nut. For example, as shown in FIG. 8, the frame member 1 is formed with a communication hole 5 that communicates with the insertion hole 3 of the other member 2 and into which the bolt 4 is inserted. A reinforcing member 6 composed of a base material 6 a and a filling member 6 b is provided inside the frame member 1, and a through hole 7 corresponding to the communication hole 5 is formed in the reinforcing member 6. Then, the bolt 4 is fastened to the nut 8 disposed in the through hole 7 from the outside of the frame member 1 through the insertion hole 3 and the communication hole 5, and the other member 2 is fixed to the frame member 1.

  In such a configuration, the other member 2 is fixed to the frame member 1 after the foaming filler disposed between the frame member 1 and the substrate 6a is heated and foamed to form the filling member 6b. For this reason, the foaming filler protrudes into the through hole 7 of the reinforcing member 6, and the nut 8 cannot be satisfactorily disposed in the through hole 7, and the bolt 4 can be fastened to the nut 8. There is a possibility that it cannot be done. That is, there is a possibility that the other member 2 cannot be fixed to the frame member 1.

  The present invention has been made in view of such circumstances, and can improve the collision performance and reduce the weight while suppressing deformation, and can favorably fix the other member to the frame member with the bolt. An object of the present invention is to provide a vehicle body frame structure that can be used.

  A first aspect of the present invention that solves the above-described problem is a vehicle body frame structure that is formed under a vehicle floor and is formed of a plurality of frame members. The frame member includes a base material and the base. And a reinforcing member comprising a filling member made of a thermosetting foaming filler filled between the frame member and the frame member, and a nut disposed on the inner side of the frame member on the frame member. By fastening a bolt from the outside, the other member is fixed to the frame member, and the nut and the base material are integrally formed.

  A second aspect of the present invention is the vehicle body frame structure according to the first aspect, wherein the base material is formed of a resin material, and the nut and the base material are integrally formed by insert molding. The vehicle body frame structure is characterized by the following.

  According to a third aspect of the present invention, there is provided a vehicle body frame structure according to the first or second aspect, wherein the other member is a suspension bracket to which a part of a rear suspension is coupled. is there.

  According to the present invention, since the collision performance of the frame member constituting the vehicle body frame is greatly improved by the filling member constituting the reinforcing member, the vehicle body frame can be used even when a collision (rear collision) occurs from the rear of the vehicle. The deformation of the vehicle is suppressed and the safety of the vehicle is improved. Further, the collision performance of the frame member is improved, and the weight of the frame member can be reduced. For this reason, fuel consumption can also be improved.

  Furthermore, in this invention, since the nut and base material for fixing another member to a frame member are integrally formed, another member can be favorably fixed to a frame member with a volt | bolt.

1 is a schematic view showing a vehicle body structure of a vehicle according to an embodiment. It is the schematic which shows an example of the rear suspension which comprises a vehicle. It is a side view which shows the frame member which concerns on one Embodiment. It is a schematic perspective view which shows the structure of the frame member which concerns on one Embodiment. It is sectional drawing which shows the structure of the frame member which concerns on one Embodiment. It is sectional drawing which shows the attachment state of the other member with respect to the frame member which concerns on one Embodiment. It is sectional drawing which shows the formation process of the filling member which concerns on one Embodiment. It is sectional drawing which shows the attachment state of the other member with respect to the frame member which concerns on a prior art.

  Hereinafter, a vehicle body frame structure according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a vehicle 10, which is an automobile, includes a vehicle body frame 20 that forms a skeleton of a lower body of a vehicle body 11 below the floor (below the passenger compartment). The vehicle body frame 20 is composed of a plurality of frame members. For example, in the present embodiment, the vehicle body frame 20 includes a pair of side members 21 extending in the front-rear direction of the vehicle 10 and a plurality of cross members 22 extending in the vehicle width direction of the vehicle 10. Yes. Each side member 21 is formed by, for example, connecting a plurality of members, and in this embodiment, a front side member 23 that forms the front side of the vehicle 10 and a rear side member 24 that forms the rear side of the vehicle 10. It consists of and. Each cross member 22 is fixed to a predetermined position of the side member 21 by spot welding or the like.

  The structure of the vehicle body frame 20 is not particularly limited. However, since it forms a skeleton of the vehicle 10, it is preferable that its rigidity is relatively high. The vehicle body frame 20 preferably has a high overall rigidity, and in particular, it is desirable that the rigidity of the portion to which other members are connected is high.

  For example, in the present embodiment, the front wheel 30 (see FIG. 1) of the vehicle 10 is supported on the vehicle body 11 (vehicle body frame 20) by a front suspension (not shown). The rear wheel 31 of the vehicle 10 is supported on the vehicle body 11 (vehicle body frame 20) by a rear suspension. As shown in FIG. 2, as the rear suspension 40, for example, a multi-link type rear suspension can be cited. The rear suspension 40 extends in the front-rear direction of the vehicle 10 to determine the front-rear position of the rear wheel 31 and swings in the up-down direction, and includes a plurality of links extending in the vehicle width direction. 42, 43, 44, a shock absorber 45 extending in the vertical direction of the vehicle 10, and a strut 47, etc., that sheathes the coil spring 46. Each link 42, 43, 44 is attached to a suspension cross member (not shown in FIG. 2) that forms the skeleton of the rear suspension 40. The suspension cross member is attached to the vehicle body frame 20.

  Specifically, as shown in FIG. 3, the rear side member 24 constituting the vehicle body frame 20 is inclined at a portion facing the rear wheel 31 of the vehicle 10 so that the rear end side is positioned above the front end side. It has a kick-up portion 24a. The kick-up portion 24a is provided to avoid interference with the rear suspension 40 and the like. A suspension cross member 48 constituting the rear suspension 40 is coupled to the kick-up portion 24a of the rear side member 24 via a suspension bracket 50. That is, a part of the rear suspension 40 is connected to the kick-up portion 24 a of the rear side member 24. In the present embodiment, the suspension cross member 48 is formed of a cross-shaped pipe frame, and is fixed to the rear side member 24 and the suspension bracket 50 by fastening members 51 such as bolts.

  As shown in FIGS. 4 and 5, the kick-up portion 24a of the rear side member 24 is filled with a filling member 61 formed of a heat-curing foam filling material and provided on the filling member 61. A reinforcing member 60 composed of a base member 62 fixed to the rear side member 24 by a member 61 is provided. The rear side member 24 according to the present embodiment is formed in a substantially U-shaped cross section to define a groove portion 25, and a reinforcing member 60 is provided in the groove portion 25. On the rear side member 24, a rear side member upper 70 which is another frame member constituting the vehicle body frame 20 is joined by spot welding or the like, and the groove portion 25 is closed by the rear side member upper 70.

  Here, as the foaming filler that is the material of the filling member 61, for example, an epoxy-based thermosetting foaming filler is used. The base material 62 is for temporarily holding the unfoamed (before heating and foaming) filler and guiding the foamed area, and is formed of a relatively hard plate material such as a metal material or a resin material. Yes.

  In this embodiment, the filling member 61 constituting the reinforcing member 60 is formed by heating and foaming a thermosetting foaming filler. Specifically, the reinforcing member 60 is formed by the following procedure. First, an unfoamed filler is placed in the rear side member 24, and a base material 62 is placed on the filler. In this state, the filler is heated and foamed. Thereby, the filling member 61 made of the foamed filler is formed into a desired shape, and the filling member 61 is firmly joined to the rear side member 24 and the base material 62. That is, the rear side member 24 and the base material 62 are joined by the filling member 61 to form the reinforcing member 60.

  When the foaming filler is heated and foamed, it is preferable that the base material 62 is temporarily fixed to the rear side member 24 to restrict the movement of the base material 62. Thereby, the foaming filler can be heated and foamed into a desired shape, and the filling member 61 can be satisfactorily formed into a predetermined shape.

  Thus, the reinforcing member 60 is provided in the kick-up portion 24a of the rear side member 24, that is, the filling member 61 having a predetermined shape is provided in the kick-up portion 24a. Improves collision performance. That is, even when a collision from the rear of the vehicle (rear collision) occurs, the energy of the collision is absorbed by the filling member 61 and deformation of the body frame 20 is suppressed, and the safety of the vehicle 10 is improved.

  The shape of the filling member 61 is not particularly limited, and may be appropriately determined according to the shape of the rear side member 24 and the like. In the present embodiment, the filling member 61 is provided at each of the two corners of the groove 25 defined by the rear side member 24. Each corner of the groove 25 has a large load (energy) load in the event of a collision from the rear of the vehicle. For this reason, by providing the filling member 61 at each corner, the energy at the time of the collision can be absorbed by the filling member 61 and the deformation of the vehicle body frame 20 can be effectively suppressed.

  Further, the base material 62 constituting the reinforcing member 60 is not directly fixed (joined) to the rear side member 24, and is fixed only by the filling member 61. By setting it as such a structure, the energy at the time of a collision can be efficiently absorbed by the filling member 61, and a deformation | transformation of the vehicle body frame 20 can be suppressed.

  The material of the base material 62 is not particularly limited, and as described above, for example, a relatively hard material such as a metal material or a resin material can be used. In particular, a relatively light resin material is used. Is preferred. Since the energy at the time of the collision is efficiently absorbed by the filling member 61, deformation of the vehicle body frame 20 can be suppressed even if the base material 62 is formed of a resin material. Therefore, by forming the base material 62 from a resin material, the vehicle body frame 20 can be reduced in weight and fuel efficiency can be improved while improving the collision performance.

  Incidentally, as described above, other members such as the suspension bracket 50 are fixed to the kick-up portion 24a of the rear side member 24. The method of fixing the suspension bracket 50 to the rear side member 24 is not particularly limited, but the suspension bracket 50 is fixed to the rear side member 24 by, for example, bolts and nuts. Specifically, as shown in FIG. 6, the suspension bracket 50 is formed with an insertion hole 52 into which a bolt 80 is inserted, and the rear side member 24 is formed with a communication hole 26 communicating with the insertion hole 52. Has been. In the rear side member 24, a nut 81 to which the bolt 80 is fastened is disposed at a position corresponding to the communication hole 26. The suspension bracket 50 is firmly fixed to the rear side member 24 by fastening the bolt 80 inserted through the insertion hole 52 and the communication hole 26 to the nut 81 disposed in the rear side member 24.

  And in this invention, the nut 81 for fixing the suspension bracket 50 which is another member in this way, and the base material 62 which comprises the reinforcement member 60 are integrally formed. In the present embodiment, a resin material is used as the material of the base material 62, and the base material 62 and the nut 81 are integrally formed by insert molding.

  Since the base material 62 and the nut 81 are integrally formed, the base material 62 can be temporarily fixed to the rear side member 24 using the nut 81. As described above, when the filler is heated and foamed, it is preferable that the base material 62 is temporarily fixed to the rear side member 24 to restrict the movement of the base material 62. In the configuration in which the base member 62 and the nut 81 are integrally formed, for example, as shown in FIG. 7, the bolt 80 is fastened to the nut 81 from the outside of the rear side member 24 through the communication hole 26. The material 62 and the rear side member 24 can be temporarily fixed very easily. In this state, the filling member 61 is formed favorably by heating and foaming the filler 100.

  After the filling member 61 is formed, the bolt 80 is once removed, and the suspension bracket 50 is fixed to the rear side member 24 by the bolt 80 again (see FIG. 6). After the filling member 61 is formed, the base material 62 is firmly joined to the rear side member 24 by the filling member 61, so that the base material 62 does not move even if the bolt 80 is removed. That is, there is no positional shift between the nut 81 and the communication hole 26. Therefore, the bolt 80 can be easily fastened to the nut 81 also when the suspension bracket 50 is fixed to the rear side member 24.

  Since the base member 62 and the nut 81 are integrally formed in this manner, it is possible to suppress the occurrence of defective attachment of the suspension bracket 50 to the rear side member 24. That is, when the foaming filler is heated and foamed to form the filling member 61, the filler 80 does not enter the periphery of or inside the nut 81, and the bolt 80 can be securely fastened to the nut 81.

  As mentioned above, although one Embodiment of this invention was described, Of course, this invention is not limited to such Embodiment. The present invention can be modified as appropriate without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the example in which the nut and the base material are integrally formed by insert molding has been described, but the method of integrally forming the nut and the base material is not particularly limited.

  For example, in the above-described embodiment, the rear side member is exemplified as the frame member on which the reinforcing member is provided. However, the reinforcing member may be provided on any frame member constituting the vehicle body frame. Further, although the suspension bracket is exemplified as the other member fixed to the rear side member that is the frame member, of course, the other member is not limited to the suspension bracket.

  In the above-described embodiment, the multi-link type rear suspension is illustrated as an example of the rear suspension coupled to the kick-up portion. However, the type of the rear suspension is not particularly limited.

DESCRIPTION OF SYMBOLS 10 Vehicle 11 Car body 20 Body frame 21 Side member 22 Cross member 23 Front side member 24 Rear side member 24a Kick-up part 25 Groove part 26 Communication hole 30 Front wheel 31 Rear wheel 40 Rear suspension 41 Trailing arm 42, 43, 44 Link 45 Shock absorber 46 Coil spring 47 Strut 48 Suspension cross member 50 Suspension bracket 51 Fastening member 52 Insertion hole 60 Reinforcement member 61 Filling member 62 Base material 70 Rear side member upper 80 Bolt 81 Nut 100 Filling material

Claims (3)

A vehicle body frame structure formed by a plurality of frame members arranged under the floor of the vehicle,
In the frame member, there is provided a reinforcing member composed of a base material and a filling member made of a thermosetting foaming filler filled between the base material and the frame member,
By fastening bolts from the outside of the frame member to nuts arranged inside the frame member, other members are fixed to the frame member,
A vehicle body frame structure in which the nut and the base material are integrally formed. The vehicle body frame structure according to claim 1,
The vehicle body frame structure, wherein the base material is formed of a resin material, and the nut and the base material are integrally formed by insert molding. The vehicle body frame structure according to claim 1 or 2,
The vehicle body frame structure characterized in that the other member is a suspension bracket to which a part of a rear suspension is coupled.

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