JP5973366B2 - Closed section frame structure - Google Patents

Description

  The present invention relates to a closed cross-section frame structure in which a closed cross section is formed at both frame sections by overlapping a first frame section having a substantially U-shaped cross section and a second frame section having a substantially U-shaped cross section.

As a frame structure, an aluminum alloy main frame having a substantially U-shaped cross section and a resin layer bonded to the inside of the main frame is known. According to this vehicle body frame, it is possible to ensure the strength and rigidity of the main frame by bonding a resin layer inside the main frame (see, for example, Patent Document 1).
In addition, it is conceivable to secure the strength and rigidity of the main frame by joining resin ribs inside the main frame.

  On the other hand, in order to ensure the strength and rigidity of the frame structure, there is one in which the frame structure is formed in a closed cross section. In the closed cross-section frame structure, the first frame portion and the second frame portion are each formed in a substantially hat shape, and an adhesive is applied between the flange of the first frame portion and the flange of the second frame portion. The two flanges are connected with the adhesive to form a closed cross section (see, for example, Patent Document 2).

  Here, as a method for further enhancing the strength and rigidity of the closed cross-section frame structure disclosed in Patent Document 2, before connecting the first frame portion and the second frame portion, each of the first frame portion and the second frame portion is internally provided. It is conceivable to join a resin layer or a resin rib.

Japanese Utility Model Publication No. 2-125484 Japanese Patent No. 4281555

However, in this method, before connecting the first frame portion and the second frame portion, it is necessary to join a resin layer or a resin rib inside each of the first frame portion and the second frame portion.
For this reason, two steps, a step of joining a resin layer or a rib made of resin inside the first frame portion and the second frame portion, and a step of connecting the flanges of both frame portions with an adhesive are necessary, and the process is closed. It takes time to manufacture the cross-section frame structure.

  In addition, before connecting the first frame portion and the second frame portion, a resin layer or a resin rib is joined to each inside of the first frame portion and the second frame portion. Therefore, in a state where the flanges of both the frame portions are connected with the adhesive, the resin layer and the resin rib cannot be joined across the connection portion of the flange. For this reason, it is difficult to ensure sufficient strength and rigidity of the closed cross-section frame structure.

  Furthermore, when the first frame part and the second frame part are formed in a complicated shape having a substantially hat-shaped cross section, it is difficult to form both frame parts with high accuracy. For this reason, it is difficult to suitably manage the gap between the flanges of the first frame portion and the second frame portion so that they can be connected with an adhesive, and it is difficult to stably manufacture the closed cross-section frame structure.

  In the present invention, the first frame part and the second frame part can be formed in a closed cross section, and the process of filling the closed cross section with resin can be easily performed.Furthermore, sufficient rigidity and strength can be secured, It is an object of the present invention to provide a closed cross-section frame structure that can stably manufacture the closed cross-section frame structure.

  In the invention according to claim 1, the first frame part is formed in a substantially U-shaped cross section with the first base and the first leg part protruding from both sides of the first base, and the second frame part is the first frame part. The second base and the second leg projecting from both sides of the second base are formed in a substantially U-shaped cross section, and the first leg and the second leg are overlapped to form the first base. A closed cross-section frame structure in which a closed cross-section is formed by a frame portion and the second frame portion, wherein the first leg portion and the second leg portion are overlapped by overlapping the first leg portion and the second leg portion. An inner space is formed in both frame portions of the two frame portions, and a core is disposed in the inner space, whereby a part of the inner space is formed in the filling space, and the two frame portions are directed toward the filling space. By filling the resin from the outside, Resinous portion covering the first leg and the second leg portion superimposed with the resin is formed, the first leg and the second leg portion in the resin portion is characterized in that it is joined.

  According to a second aspect of the invention, an inner surface is formed by the first frame portion, the second frame portion, and the resin portion, and includes a substantially rectangular frame-shaped rib projecting from the inner surface toward the internal space. And

  A third aspect of the present invention includes a fastening resin portion formed of the resin on the outer surface of the both frame portions, and a fastening member that is integrally provided in the fastening resin portion and through which the fastening member can pass. To do.

  According to a fourth aspect of the present invention, a gap for guiding the resin to the filling space is formed between the overlapped first leg portion and second leg portion.

  A fifth aspect of the present invention includes a communication hole formed on each of the first leg and the second leg and overlapped with each other in a state where the first leg and the second leg are overlapped.

  In the invention according to claim 1, the first leg portion of the first frame portion and the second leg portion of the second frame portion are overlapped, and then the core is disposed in the internal space of both frame portions and formed by the core. The filled space was filled with resin, and the first leg and the second leg were joined with the filled resin.

Only in the step of joining the first leg portion and the second leg portion with resin, a closed cross section can be formed by the first frame portion and the second frame portion, and the resin is put inside the both frame portions formed in the closed cross section. Can be filled. Therefore, the process of connecting the first frame part and the second frame part with welding or an adhesive can be eliminated.
Thereby, the process which forms a 1st frame part and a 2nd frame part in a closed cross section, and fills the inside of the both frame parts formed in the closed cross section can be performed easily.

Furthermore, the resin part was formed with the filled resin with which both the frame parts were filled, and the first leg part and the second leg part were joined with this resin part. Therefore, the resin part can be continuously formed so as to straddle the part where both the frame parts are joined with the resin part.
Thereby, since both the frame parts can reinforce the resin part, the rigidity and strength of the closed cross-section frame structure can be sufficiently secured.

In addition, the first frame portion and the second frame portion are each formed in a substantially U-shaped cross section, and are joined by covering the overlapped first leg portion and second leg portion with a resin portion.
Therefore, it is possible to remove the flange for connection that has been conventionally required from the first frame portion and the second frame portion, and it is possible to simplify the cross-sectional shapes of both frame portions. Thereby, a 1st frame part and a 2nd frame part can be accurately formed (molding) with respect to the conventional frame part.

Further, the overlapped first leg portion and second leg portion are covered with a resin portion so as to be joined. Thereby, the tolerance | permissible tolerance range with respect to the clearance gap between a 1st leg part and a 2nd leg part can be ensured large.
As described above, since both the frame portions can be formed with high accuracy and a large allowable tolerance range with respect to the gap between the two leg portions can be ensured, the closed cross-section frame structure can be stably manufactured.

In the invention according to claim 2, the inner surface is formed by the first frame portion, the second frame portion, and the resin portion, and a rib is projected from the inner surface toward the inner space, thereby forming a substantially rectangular frame shape.
Therefore, the rib can be continuously formed so that the portion where the first leg portion and the second leg portion are joined by the resin portion is straddled by the rib.
Thereby, since both frame parts can be reinforced with ribs, the rigidity and strength of the closed cross-section frame structure can be sufficiently secured.

In the invention which concerns on Claim 3, the fastening resin part was formed in the outer surface of both frame parts, and the fastening member was integrally provided in the fastening resin part. Since this fastening resin portion can be formed at any position of both frame portions, the fastening member can be attached to a desired location.
Furthermore, the fastening member can be easily attached to a desired location by insert-molding the fastening member in the fastening resin portion.

In the invention according to claim 4, a gap is formed between the first leg part and the second leg part that are overlapped, and the resin is guided to the filling space through this gap. Therefore, the space formed between the first leg portion and the second leg portion can be effectively utilized to fill the filling space with the resin.
Thereby, it is not necessary to provide a dedicated flow path for guiding the resin to the filling space, and the configuration can be simplified.

In the invention which concerns on Claim 5, a communicating hole was formed in the 1st leg part and the 2nd leg part, respectively, and each communicating hole was made to mutually overlap. Therefore, the outer side and the inner side of both frame parts are communicated with each other through the communication hole of the first leg part and the communication hole of the second leg part.
Thereby, the filling state of the resin filled in the closed cross section inside the both frame portions can be easily confirmed from the outside of both frame portions, and the quality can be stabilized.

It is a perspective view showing a closed section frame structure concerning the present invention. FIG. 2 is a 2-2 diagram of FIG. 1. FIG. 3 is a 3-3 diagram of FIG. 2. It is a figure explaining the process of manufacturing the closed cross-section frame structure which concerns on this invention. It is sectional drawing which shows the state which manufactured the closed cross-section frame structure based on this invention.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

The closed cross-section frame structure 10 according to the embodiment will be described.
As shown in FIGS. 1 and 2, the closed cross-section frame structure 10 includes an upper frame portion (first frame portion) 12 having a substantially U-shaped cross section and a lower frame portion (second frame portion) having a substantially U-shaped cross section. ) 13, a resin portion 14 for joining the upper frame portion 12 and the lower frame portion 13, a plurality of ribs 15 formed integrally with the resin portion 14, and a fastening resin portion 16 formed integrally with the resin portion 14 And a collar (fastening member) 17 provided integrally with the fastening resin portion 16.
The closed cross-section frame structure 10 is formed in a hollow cylinder having a substantially rectangular cross section, and is used as a member constituting a skeleton of a vehicle body as an example.

  The upper frame portion 12 is CFRP (carbon fiber reinforced plastic) in which a thermoplastic resin (sheet) is laminated on both sides of a continuous fiber mat (for example, carbon fiber). The upper frame portion 12 has improved workability by being laminated with thermoplastic sheets on both sides of the carbon fiber.

The upper frame portion 12 includes an upper base (first base) 21 formed in a flat plate shape (band shape), and a left upper leg portion (first leg portion) protruding from the left side 21 a of the upper base 21. 22 and a right upper leg portion (first leg portion) 23 protruding from the right side 21 b of the upper base 21.
The upper frame 21, the left upper leg 22, and the right upper leg 23 form an upper frame 12 having a substantially U-shaped cross section.

  A left upper corner 24 is formed at the intersection of the left side 21 a of the upper base 21 and the left upper leg 22. A right upper corner 25 is formed at the intersection of the right side 21 b of the upper base 21 and the right upper leg 23.

The left upper leg portion 22 includes a left upper portion 27 bent downward from the left side 21 a of the upper base 21, a left step portion 28 bent outward from a lower end 27 a of the left upper portion 27, and a lower end 28 a of the left step portion 28. And a lower left portion 29 that is bent downward.
The lower left portion 29 and the left step portion 28 are bulged outward with respect to the upper left portion 27. A plurality of left upper communication holes (communication holes) 31 are formed in the left lower portion 29 at predetermined intervals in the longitudinal direction (arrow direction) (see FIG. 3).

The right upper leg portion 23 is symmetrical with the left upper leg portion 22 and is bent outward from the upper right portion 33 bent downward from the right side 21b of the upper base 21 and from the lower end 33a of the upper right portion 33. It has a right step portion 34 and a right lower portion 35 bent downward from the lower end 34a of the right step portion 34.
The lower right portion 35 and the right step portion 34 are bulged outward with respect to the upper right portion 33.
A plurality of right upper communication holes (communication holes) 37 are formed in the lower right portion 35 at predetermined intervals in the longitudinal direction, like the plurality of left upper communication holes 31.

  The lower frame portion 13 is a CFRP (carbon fiber reinforced plastic) in which a thermoplastic resin (sheet) is laminated on both surfaces of a continuous fiber mat (for example, carbon fiber), like the upper frame portion 12. The lower frame portion 13 has improved workability by being laminated with thermoplastic sheets on both sides of the carbon fiber.

The lower frame portion 13 includes a lower base (second base) 41 formed in a flat plate shape (strip shape), and a left lower leg portion (second leg portion) 42 protruding from the left side 41a of the lower base 41. And a lower right leg (second leg) 43 protruding from the right side 41b of the lower base 41.
The upper base 21, the left lower leg portion 42, and the right lower leg portion 43 form a lower frame portion 13 having a substantially U-shaped cross section.

  A left lower corner 45 is formed at the intersection of the left side 41 a of the lower base 41 and the left lower leg 42. A right lower corner 46 is formed at the intersection of the right side 41 b of the lower base 41 and the right lower leg 43.

  In the lower base 41, a plurality of baseboard holes 48 are formed at intervals along the longitudinal direction (arrow direction) (see FIG. 3).

The left lower leg portion 42 is bent upward from the left side 41 a of the lower base 41.
The left lower upper part 42 a of the left lower leg part 42 is superimposed on the left lower part 29 of the left upper leg part 22, and a left gap (gap) 52 is formed between the left lower upper part 42 a and the left lower part 29.

A plurality of left lower communication holes (communication holes) 53 are formed in the left lower upper portion 42a at predetermined intervals along the longitudinal direction (arrow direction) (see FIG. 3).
The left upper communication hole 31 and the left lower communication hole 53 are coaxially overlapped with the left lower upper part 42a and the left lower part 29 being overlapped.

The right lower leg 43 is a portion symmetrical to the left lower leg 42, and is bent upward from the right side 41 b of the lower base 41.
The right lower upper portion 43 a of the right lower leg portion 43 is overlapped with the right lower portion 35 of the right upper leg portion 23, and a right gap (gap) 55 is formed between the right lower upper portion 43 a and the right lower portion 35.

A plurality of right lower communication holes (communication holes) 56 are formed in the right lower upper portion 43a at predetermined intervals in the longitudinal direction, like the plurality of left lower communication holes 53.
The right upper communication hole 37 and the right lower communication hole 56 are coaxially overlapped with the right lower upper portion 43a and the right lower portion 35 being overlapped.

The upper frame portion 12 and the lower frame portion 13 are joined by a resin portion 14.
The resin portion 14 includes left and right inner resin portions 58 and 59 provided inside the upper frame portion 12 and the lower frame portion 13, and left and right outer resin portions provided outside the upper frame portion 12 and the lower frame portion 13. 61, 62, a left gap resin portion 64 provided in the left gap 52, and a right gap resin portion 65 provided in the right gap 55.

  The left and right inner resin portions 58 and 59, the left and right outer resin portions 61 and 62, and the left and right gap resin portions 64 and 65 are respectively symmetrical portions. Hereinafter, the left portions 58, 61, and 64 will be described. The description of the right portions 59, 62, 65 is omitted.

The left inner resin portion 58 is integrally connected to the inner surface of the left upper corner portion 24, the inner surface of the left upper leg portion 22 (left upper portion 27), the inner surface of the left lower leg portion 42, and the inner surface of the left lower corner portion 45. Yes.
The left outer resin portion 61 is integrally connected to a portion 27b of the upper left portion 27 (outer surface), an outer surface of the left step portion 28, an outer surface of the left lower portion 29, and a portion 42b of the left lower leg portion 42 (outer surface). Yes.
By providing the left gap resin portion 64 in the left gap 52, the left gap resin portion 64 is integrally connected to the inner surface of the left step portion 28, the inner surface of the left lower portion 29, and the outer surface of the left lower leg portion 42 (left lower upper portion 42a). .

As a result, the left upper leg portion 22 and the left lower leg portion 42 are integrally joined by the left inner resin portion 58, the left outer resin portion 61, and the left gap resin portion 64.
Here, the left upper communication hole 31 is filled with the left upper connection resin portion 67, and the left lower communication hole 53 is filled with the left lower connection resin portion 68. Accordingly, the left outer resin portion 61 and the left gap resin portion 64 are connected by the left upper connection resin portion 67, and the left inner resin portion 58 and the left gap resin portion 64 are connected by the left lower connection resin portion 68.
As a result, the left upper connecting resin portion 67 and the left lower connecting resin portion 68 serve as a so-called anchor, and the left upper leg portion 22 and the left lower leg portion 42 are more firmly joined.

Similarly, the right upper leg portion 23 and the right lower leg portion 43 are integrally joined by a right inner resin portion 59, a right outer resin portion 62, and a right gap resin portion 65.
Here, the right upper communication hole 37 is filled with the right upper connection resin portion 71, and the right lower communication hole 56 is filled with the right lower connection resin portion 72, whereby the right upper leg portion 23 and the right lower leg portion 43 are formed. It is joined more firmly.

That is, the overlapped left upper leg portion 22 and left lower leg portion 42 and the overlapped right upper leg portion 23 and right lower leg portion 43 are joined by being covered with the resin portion 14.
Here, the upper frame portion 12 and the lower frame portion 13 are formed of CFRP. In CFRP, it is difficult to accurately form a member having a complicated cross-sectional shape.
Accordingly, the upper frame portion 12 and the lower frame portion 13 are each formed in a substantially U-shaped cross section, and the left upper leg portion 22 and the left lower leg portion 42 that are overlapped, or the right upper leg portion 23 and the right lower leg that are overlapped. The part 43 is covered with the resin part 14 to be joined.

  By forming the upper frame portion 12 and the lower frame portion 13 in a substantially U-shaped cross section, the cross-sectional shapes of both the frame portions 12 and 13 can be simplified. Thereby, the upper frame part 12 and the lower frame part 13 can be accurately formed (molded) with respect to the conventional frame part.

Further, the overlapped left and right leg portions 22 and 42 and the overlapped right and left leg portions 23 and 43 are covered with the resin portion 14 to be joined. As a result, a large allowable tolerance range can be secured for the left gap 52 between the left leg portions 22 and 42 and the right gap 55 between the right leg portions 23 and 43.
Thus, the frame portions 12 and 13 can be formed with high accuracy, and a large tolerance range can be secured for the gap between the left leg portions 22 and 42 and the gap between the right leg portions 23 and 43. The cross-section frame structure 10 can be manufactured stably.

  Further, the left upper leg portion 22 and the left lower leg portion 42, the right upper leg portion 23 and the right lower leg portion 43 are joined by the resin portion 14, whereby the upper frame portion 12, the lower frame portion 13 and the resin portion 14 are joined. A rectangular frame 11 having a closed cross section is formed. An internal space 74 is formed inside the rectangular frame 11.

By providing the rectangular frame body 11 with the resin portion 14, the left and right inner resin portions 58 and 59 can be filled into the upper frame portion 12 and the lower frame portion 13.
The left inner resin portion 58 is continuously formed so as to straddle a portion where the left upper leg portion 22 and the left lower leg portion 42 are joined in an overlapping state.
Further, the right inner resin portion 59 is continuously formed so as to straddle a portion where the right upper leg portion 23 and the right lower leg portion 43 are joined in an overlapping state.
Accordingly, the upper frame portion 12 and the lower frame portion 13 are reinforced by the left and right inner resin portions 58 and 59, and the rigidity and strength of the rectangular frame body 11 (that is, the closed cross section) can be sufficiently secured.

A plurality of ribs 15 are provided on each inner surface of the rectangular frame 11 (upper base 21, lower base 41, left inner resin portion 58 and right inner resin portion 59) at a predetermined interval in the longitudinal direction (arrow direction) (see FIG. 3). It is integrally formed.
As shown in FIGS. 2 and 3, the plurality of ribs 15 are formed in a substantially rectangular frame shape by projecting from the inner surface 11 b of the rectangular frame 11 toward the center of the internal space 74 with a rib height dimension H <b> 1. ing.

The rib 15 spans a portion where the left upper leg portion 22 and the left lower leg portion 42 are joined in an overlapping state, and a portion where the right upper leg portion 23 and the right lower leg portion 43 are joined in an overlapping state. It is formed continuously so as to straddle.
Thereby, the rib 15 is continuously formed in the inner surface 11b of the rectangular frame 11 over the perimeter.
In this way, by providing the plurality of ribs 15 on the inner surface 11b of the rectangular frame 11, the rectangular frame 11 is reinforced by the plurality of ribs 15, and sufficient rigidity and strength of the rectangular frame 11 can be secured. it can.

Returning to FIGS. 1 and 2, the fastening resin portion 16 is integrally provided on the right outer surface 11 a of the rectangular frame 11 (the outer surfaces of both frame portions).
The fastening resin portion 16 protrudes from the right outer surface of the rectangular frame body 11 or the right outer resin portion 62 toward the outside of the rectangular frame body 11. A guide hole 77 is penetrated through the distal end portion 16a of the fastening resin portion 16 in the vertical direction.

A collar 17 is integrally provided at the distal end portion 16 a of the fastening resin portion 16.
The collar 17 is insert-molded at the distal end portion 16 a of the fastening resin portion 16 when the fastening resin portion 16 is molded. The collar 17 is a metal member having a through hole 78 by being formed in a cylindrical shape. The through hole 78 is arranged coaxially with the guide hole 77.

  Therefore, the bolt 79 (fastening member) inserted into the guide hole 77 can be passed through the through hole 78 of the collar 17 and the penetrated bolt can be screwed to a support (for example, a vehicle body). By embedding the metal collar 17 in the fastening resin portion 16, the closed section frame structure 10 can be firmly attached to the support.

Here, the fastening resin portion 16 can be formed at an arbitrary position of the rectangular frame 11. Thereby, the collar 17 can be attached to a suitable location according to the fastening position of the support.
Furthermore, the collar 17 can be easily attached to a desired location by insert-molding the collar 17 at the distal end portion 16 a of the fastening resin portion 16.

Next, a process of manufacturing the closed cross-section frame structure 10 will be described with reference to FIGS.
As shown in FIG. 4A, in the setting step, after the lower frame portion 13 is arranged on the fixed mold 81, the core 83 is arranged inside the lower frame portion 13, and the arranged core 83 is placed on the baseboard 84. Hold in place. The skirting board 84 passes through a plurality of skirting board holes 48 formed in the lower frame portion 13 (lower base 41).

The core 83 includes a plurality of bulging portions 83a on the outer periphery. By providing the plurality of bulging portions 83a on the outer periphery of the core 83, a plurality of ribs 15 (see FIG. 2) can be formed.
After the core 83 is held inside the lower frame part 13, the upper frame part 12 is placed on the lower frame part 13 in an overlapping state.
Specifically, the left upper leg portion 22 (left lower portion 29) is superimposed on the outer side of the left lower leg portion 42 (left lower upper portion 42a), and the right upper leg is disposed on the outer side of the right lower leg portion 43 (right lower upper portion 43a). The part 23 (lower right part 35) is overlapped.

By arranging the core 83 in the internal space 74 of the upper frame portion 12 and the lower frame portion 13 that are overlapped, a part of the internal space 74 is formed in the filling space 75.
Further, the left gap 52 is formed by overlapping the left lower portion 29 on the outer side of the left lower upper portion 42a. Similarly, the right gap 55 is formed by overlapping the right lower portion 35 on the outer side of the right lower upper portion 43a.
Further, a metal collar 17 is disposed on the fixed mold 81. In this state, the movable mold 82 is moved and clamped.

Next, in the filling step, the cavity 86 is filled with a molten resin (resin).
The molten resin filled in the cavity 86 is guided to the filling space 75 from the outside of the upper frame portion 12 and the lower frame portion 13 which are overlapped to the filling space 75 through the left gap 52 and the right gap 55 as indicated by an arrow A.
At the same time, a part of the filled molten resin is guided around the collar 17 as indicated by an arrow B.

As shown in FIG. 4B, in the solidification step, the resin portion 14 and the fastening resin portion 16 are molded by solidifying the molten resin filled in the cavity 86. By molding the resin portion 14, the left lower leg portion 42 and the left upper leg portion 22 are integrally joined by the resin portion 14, and the right lower leg portion 43 and the right upper leg portion 23 are integrally joined by the resin portion 14. Is done.
In this state, a closed cross section is formed by the upper frame portion 12 and the lower frame portion 13, and the left and right inner resin portions 58 and 59 of the resin portion 14 are inside the both frame portions 12 and 13 formed in the closed cross section. Filled.

Further, when the fastening resin portion 16 is molded, insert molding is performed in a state where the collar 17 is embedded in the distal end portion 16 a of the fastening resin portion 16. Thus, the resin part 14 and the fastening resin part 16 are shape | molded when a molten resin solidifies.
Next, in the mold opening process, the fixed mold 81 and the movable mold 82 are opened, and the closed-section frame structure 10 and the core 83 are removed from the fixed mold 81.

  As shown in FIG. 5, in the core removal step, after the closed cross-section frame structure 10 and the core 83 are taken out from the fixed mold 81 (see FIG. 4B), the core 83 is removed from the closed cross-section frame structure 10. Remove. By removing the core 83 from the closed-section frame structure 10, the manufacturing process of the closed-section frame structure 10 is completed.

Returning to FIG. 4B, according to the closed cross-section frame structure 10, the left lower leg portion 42 and the left upper leg portion 22 are joined by the resin portion 14, and the right lower leg portion 43 and the right upper leg portion are joined. The closed cross section can be formed by both the frame parts 12 and 13 only by the step of joining the 23 by the resin part 14.
Further, in the same process, the left and right inner resin parts 58 and 59 can be filled in the frame parts 12 and 13 formed in the closed cross section.

  Therefore, the process of connecting the upper frame portion 12 and the lower frame portion 13 with welding or an adhesive can be eliminated. This facilitates the process of forming the upper frame portion 12 and the lower frame portion 13 in a closed cross section and forming the left and right inner resin portions 58 and 59 inside the frame portions 12 and 13 formed in the closed cross section. Can be done.

Further, as shown in FIG. 4A, the left gap 52 is formed by overlapping the left upper leg portion 22 (left lower portion 29) on the outside of the left lower leg portion 42 (left lower upper portion 42a). Furthermore, the right gap 55 is formed by overlapping the right upper leg 23 (right lower 35) on the outside of the right lower leg 43 (right lower upper 43a).
Therefore, the filling space 75 can be filled with the molten resin by effectively utilizing the left gap 52 and the right gap 55. Thereby, it is not necessary to provide a dedicated flow path for guiding the molten resin to the filling space 75, and the configuration can be simplified.

  Further, the left upper communication hole 31 of the left upper leg portion 22 and the left lower communication hole 53 of the left lower leg portion 42 are overlapped on the same axis. Further, the right upper communication hole 37 of the right upper leg 23 and the right lower communication hole 56 of the right lower leg 43 are overlapped on the same axis.

Therefore, the outer side and the inner side of both frame parts 12 and 13 are communicated with each other through the left upper communication hole 31 and the left lower communication hole 53. Similarly, the outer side and the inner side of both frame portions 12 and 13 communicate with each other through the right upper communication hole 37 and the right lower communication hole 56.
Thereby, the filling state of the resin part 14 (the left and right inner resin parts 58 and 59) filled in the closed cross section inside the both frame parts 12 and 13 can be easily confirmed from the outside of both the frame parts 12 and 13. It is possible to stabilize the quality.

The closed cross-section frame structure according to the present invention is not limited to the above-described embodiments, and can be changed or improved as appropriate.
For example, in the above-described embodiment, the collar 17 is illustrated as the fastening member provided in the fastening resin portion 16, but the present invention is not limited to this, and other fastening members such as nuts and bolts are provided in the fastening resin portion 16. Is also possible.

  Moreover, although the example which uses the volt | bolt 79 as a fastening member which penetrates the collar 17 was demonstrated in the said Example, it is not limited to this, It is also possible to use other fastening members, such as a rod.

  Further, in the above-described embodiment, the example in which the upper frame portion 12 and the lower frame portion 13 are formed of CFRP (carbon fiber reinforced plastic) has been described. However, the present invention is not limited thereto, and the lower frame portions 12 and 13 may be made of other materials. It can also be formed.

  Moreover, although the said Example demonstrated the example which formed the closed cross-section frame structure 10 in the hollow cylinder, it is not restricted to this, The closed cross-section frame structure 10 is a hollow cylinder of other shapes, such as a hexagon. It is also possible to form it.

Further, in the above-described embodiment, a part of the left and right upper leg portions 22 and 23 is bulged outside the left and right lower leg portions 42 and 43, and the portion bulged outward is the left and right lower leg portions 42 and 43. However, the present invention is not limited to this.
For example, a part of the left and right upper leg portions 22 and 23 may bulge inside the left and right lower leg portions 42 and 43, and a portion bulged inward may be superimposed on the left and right lower leg portions 42 and 43. Is possible.
Alternatively, the left and right upper leg portions 22 and 23 are entirely formed flat, and the whole is disposed outside the left and right lower leg portions 42 and 43, and the left and right upper leg portions 22 and 23 are partially formed. Can be superimposed on the left and right lower leg portions 42 and 43.

  In addition, in the above-described embodiment, the example in which the closed cross-section frame structure 10 is applied to the members constituting the skeleton of the vehicle body has been described. However, the present invention is not limited to this and can be used as other components. .

  Further, the closed cross-section frame structure, rectangular frame, upper frame part, lower frame part, resin part, fastening resin part, collar, left and right upper communication holes, left and right lower communication holes, cores and The shape and configuration of the skirting board are not limited to those illustrated, but can be changed as appropriate.

  The present invention is suitable for application to an automobile having a closed section frame structure in which a closed section is formed by overlapping a first frame section and a second frame section having a substantially U-shaped section.

  DESCRIPTION OF SYMBOLS 10 ... Close cross-section frame structure, 11 ... Rectangular frame, 11a ... Right outer surface (outer surface of both frame parts) of a rectangular frame, 11b ... Inner surface, 12 ... Upper frame part (1st frame part), 13 ... Lower frame Part (second frame part), 14 ... resin part, 16 ... fastening resin part, 17 ... collar (fastening member), 21 ... upper base (first base), 21a, 21b ... both sides of the upper base, 22 ... Left upper leg (first leg), 23 ... right upper leg (first leg), 31, 37 ... left and right upper communication holes (communication holes), 41 ... lower base (second base), 41a, 41b ... both sides of the lower base, 42 ... left lower leg (second leg), 43 ... right lower leg (second leg), 52 ... left gap (gap), 53, 56 ... left and right lower communication holes ( Communication hole), 55 ... right gap (gap), 74 ... internal space, 75 ... filling empty , 79 ... bolt (fastening member), 83 ... core.

Claims (5)

The first frame part is formed in a substantially U-shaped cross section with the first base and the first leg part projecting from both sides of the first base, the second frame part is the second base, and the second base The first leg and the second frame are formed by overlapping the first leg and the second leg with the second leg projecting from both sides of the first leg. A closed cross-section frame structure in which a closed cross-section is formed,
By overlapping the first leg portion and the second leg portion, an internal space is formed in both frame portions of the first frame portion and the second frame portion,
A part of the internal space is formed in the filling space by arranging the core in the internal space,
Resin is filled from the outside of both the frame portions toward the filling space, thereby forming a resin portion that covers the first leg and the second leg overlapped with the filled resin,
A closed cross-section frame structure in which the first leg and the second leg are joined by the resin part. An inner surface is formed by the first frame part, the second frame part and the resin part,
The closed cross-section frame structure according to claim 1, further comprising a substantially rectangular frame-shaped rib projecting from the inner surface toward the internal space. A fastening resin portion formed of the resin on the outer surface of the both frame portions;
A fastening member provided integrally with the fastening resin portion and capable of penetrating the fastening member;
The closed cross-section frame structure according to claim 1 or 2, characterized by comprising:   The closed cross-section frame structure according to claim 1 or 2, wherein a gap for guiding the resin to the filling space is formed between the superimposed first leg portion and second leg portion.   2. The communication device according to claim 1, further comprising a communication hole formed on each of the first leg and the second leg and overlapped with each other in a state where the first leg and the second leg are overlapped. The closed cross-section frame structure according to 2.

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