JP5649129B2 - Vehicle body frame structure - Google Patents

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

  As described in the above-mentioned patent document, deformation of the body frame can be suppressed by filling the interior of the body frame with a foam filler. However, since the body frame itself has the same structure as the conventional structure, the weight of the body frame increases to the same extent as the conventional structure or slightly increases. For this reason, there exists a possibility that the driveability and fuel consumption of a vehicle may fall, for example.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle body frame structure capable of reducing the weight while improving the collision performance and suppressing deformation.

A first aspect of the present invention that solves the above problem is a vehicle body frame structure that is formed under a vehicle floor and is formed of a plurality of frame members, and a kick-up of a rear side member that is one of the frame members. A part of the rear suspension is connected to the portion, and a kick-up portion of the rear side member is provided on the filling member and a filling member made of a thermosetting foam filler bonded to the rear side member . And a reinforcing member composed of a base member fixed to the rear side member by the filling member , and the rear side member is formed in a substantially U-shaped cross section to define a groove portion on the side member. The rear side member upper is joined so as to close the groove, and the filling member is opposite to the rear side member upper of the rear side member. In a vehicle body frame structure, characterized in that provided at the corners of the side.

A second aspect of the present invention is a vehicle body frame structure according to the first aspect, wherein the base material is formed of a resin material.

  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.

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 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 structure of the frame member which concerns on one Embodiment.

  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.

  As described above, 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.

  When the thermosetting foam filler is heated and foamed, it is preferable to temporarily fix the base material 62 to the rear side member 24 to restrict the movement of the base material 62. Although the method of temporary fixing is not particularly limited, for example, in the present embodiment, the base material 62 is temporarily fixed to the rear side member 24 by a clip member. Specifically, as shown in FIG. 6, a protrusion 63 that protrudes toward the rear side member 24 with the thickness of the filling member 61 is provided at a predetermined position of the base material 62. Is provided with a through hole 64. On the other hand, the rear side member 24 is also provided with a communication hole 26 communicating with the through hole 64. For example, the base member 62 is temporarily fixed to the rear side member 24 by attaching the clip member 80 made of an elastic material such as a resin material or a rubber material to the through hole 64 and the communication hole 26.

  Thereby, the filling member 61 can be satisfactorily formed into a predetermined shape by heating and foaming the thermosetting foam material into a desired shape. The clip member 80 may be removed after the filling member 61 is formed, or may be left as it is.

  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 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.

  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 Zobera 46 Coil spring 47 Strut 48 Suspension cross member 50 Suspension bracket 51 Fastening member 60 Reinforcement member 61 Filling member 62 Base member 63 Projection part 64 Through hole 70 Rear side member upper 80 Clip member

Claims (2)

A vehicle body frame structure formed by a plurality of frame members arranged under the floor of the vehicle,
A part of the rear suspension is connected to the kick-up portion of the rear side member that is one of the frame members,
In the kick-up portion of the rear side member , a filling member made of a thermosetting foaming filler joined to the rear side member and a filling member provided on the filling member are fixed to the rear side member by the filling member. A reinforcing member composed of a base material is provided ,
The rear side member is formed in a substantially U-shaped cross section to define a groove portion, a rear side member upper is joined on the side member so as to close the groove portion, and the filling member includes the rear side member of the rear side member. A vehicle body frame structure, characterized in that the vehicle body frame structure is provided at a corner on the side opposite to the member upper . The vehicle body frame structure according to claim 1 ,
A vehicle body frame structure, wherein the base material is formed of a resin material.

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