JP5238588B2 - Vehicle frame structure - Google Patents

Description

  The present invention relates to a vehicle frame structure having a closed cross section.

  Among vehicle frame structures, there is a frame structure in which ridges are increased by forming recesses on each of the four sides of a hollow columnar member to improve impact absorption performance (see, for example, Patent Document 1).

However, the prior art (Patent Document 1) has a problem that when the hollow columnar members are connected in series by welding, a spot welding gun (electrode) interferes with the recess.
For example, in order to be sandwiched between spot welding guns (electrodes), a groove shape is formed by removing the upper side located on the upper side of the figure, and the side of the hollow columnar member to be connected to the lower side When one gun is put inside the groove, the gun interferes with a recess provided on a vertical side.
That is, when joining is performed by spot welding, the spot welding gun (electrode) and the recessed portion interfere with each other, so that the recessed portion cannot be formed, the number of ridges cannot be increased, and the amount of energy absorption cannot be increased. .

JP 2008-284931 A

  The present invention provides a vehicle frame structure in which a spot gun (electrode) does not interfere with a recess, absorbs a large amount of impact, reduces weight, reduces the maximum load when crushing, and is easy to manufacture. The issue is to provide.

In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a vehicle frame structure formed by pushing a recess into an inward side of a closed cross section.
The closed cross-section is formed by closing a second frame member having a substantially U-shaped cross-section together with a first frame member having a substantially U-shaped cross-section, and the first frame member is opposed to the first vertical side. A recess is formed in each of the first and second vertical sides, and a second inclined side portion that is connected to the first vertical side portion and extends to an obtuse angle is integrated with a second inclined side portion that is connected to the second vertical side portion and extends to an obtuse angle. The base part which forms the top part is formed by couple | bonding with, and the recessed part is formed in the top part, It is characterized by the above-mentioned.

  The invention according to claim 2 is characterized in that the first frame member is formed by roll foam molding or bend molding.

  In the invention according to claim 1, the closed cross section is formed by closing together a second frame member having a substantially U-shaped cross section with respect to a first frame member having a substantially U-shaped cross section. Concave portions are formed in the first vertical side portion and the second vertical side portion facing each other, the first inclined side portion extending to the obtuse angle extending to the first vertical side portion, and the obtuse angle connecting to the second vertical side portion. Since the bottom part forming the top part is formed by integrally joining the extending second inclined side part, and the concave part is formed on the top part, the bottom part of the first frame member having a substantially U-shaped cross section is formed outward. When the plate-like members are overlapped and spot-welded, the spot gun (electrode) of the spot welding apparatus orthogonal to the first inclined side portion is inclined by the first inclined side portion, and the spot gun (electrode) is the first vertical side. Adjacent plate-like members are stacked without interfering with the side recesses. It can be bonded using Tsu bets welding.

Further, the ridgeline is increased by the recess, and the amount of absorption of the impact input in the longitudinal direction of the vehicle frame structure can be increased.
Furthermore, the weight can be reduced compared to a member (frame) that absorbs the same level of impact.

In addition, it is possible to reduce the maximum crushing load when the vehicle frame structure is crushed with a force parallel to the longitudinal direction. For example, the vehicle frame structure is employed at the rear part of the rear side frame, which is the rear part of the vehicle. When the center part of the rear side frame that extends from the floor of the passenger compartment is joined to the rear part of the frame, the force input to the center part of the rear side frame that you do not want to be destroyed can be reduced, and collision mode management is easy. There are advantages.
“Collision mode management” means preferentially crushing one frame (vehicle frame structure) to absorb collision energy and not crushing the other frame (central part of the rear side frame). Adopted to protect rear passengers and fuel system parts.

  In the invention which concerns on Claim 2, since the 1st frame member is shape | molded by roll form shaping | molding or bend shaping | molding, manufacture is easy. That is, by forming the bottom side to an obtuse angle, molding by roll foam molding or bend molding becomes easy. In particular, it has the advantage of being effective for difficult-to-form materials such as high-strength steel sheets that can be reduced in weight.

It is a perspective view of the frame structure for vehicles concerning the example of the present invention. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a figure which shows the 1st frame member of the frame structure for vehicles which concerns on an Example. It is a figure explaining the mechanism which prevents the interference of a joining point explanatory drawing and spot gun when joining another member to the 1st frame member in the frame structure for vehicles.

  Hereinafter, embodiments of the present invention will be described in detail with reference to examples.

  As shown in FIG. 1, the vehicle frame structure 11 according to the embodiment is employed on the floor of a luggage compartment 14 provided in the rear portion 13 of the vehicle 12, and the rear side frame 16 of the floor is formed in a polygonal shape and combined. . This will be specifically described below.

The vehicle 12 includes a passenger compartment 17, a luggage compartment (trunk room) 14 provided behind the passenger compartment 17, and a vehicle body 18.
The vehicle body 18 includes an underbody 21 that forms the floor of the passenger compartment 17 and the cargo compartment 14, and a rear body 22. The underbody 21 is connected to left and right side sills 24 and extends rearward of the vehicle 12 (rear side frame front portion 25, rear side frame). A central portion 26, a rear side frame rear portion 27), and a rear floor panel 31 (a rear floor center portion 32, a rear floor rear portion 33) are included, and the frame structure 11 of the embodiment is included. Note that the left and right sides of the frame structure 11 are substantially symmetrical, and the left side will be mainly described below.

  Next, the vehicle frame structure 11 will be described with reference to FIGS. 6A is a plan view of the first frame member, and FIG. 6B is a cross-sectional view taken along the line bb of FIG. 6A.

The vehicle frame structure 11 includes a rear side frame central portion 26 of the rear side frame 16 and a rear side frame rear portion 27, and includes a rear floor rear portion 33 of the rear floor panel 31 as necessary.
The rear side frame rear portion 27 forms a closed section with the first frame member 36 and the second frame member 37, and the closed section is partitioned by sandwiching the rear floor panel 31.

  As described above, the vehicle frame structure 11 is formed by pushing the concave portion into the side forming the closed cross section inward of the closed cross section, and the closed cross section is formed by the first frame member 36 having a substantially U-shaped cross section. On the other hand, the second frame member 37 having a substantially U-shaped cross section is closed together, and the first frame member 36 has a first concave portion 43 and a second vertical portion on the first vertical side portion 41 facing each other. A second concave portion 44 is formed in the side portion 42, the first inclined side portion 45 extending to the first vertical side portion 41 with the inner angle set to an obtuse angle α, and the obtuse angle α continuous to the second vertical side portion 42. The extending second inclined side portion 46 is integrally joined to form a bottom side portion 48 that forms a top portion 47, and a third concave portion 51 is formed in the top portion 47.

  The first frame member 36 is connected to the upper portion of the first vertical side portion 41, the first flange portion 53 is formed and overlaps the rear floor rear portion 33, and the second flange portion 54 is connected to the upper portion of the second vertical side portion 42. Is formed and overlaps the rear floor rear portion 33.

As shown in FIG. 6, the first frame member 36 is formed by roll foam molding or bend molding.
The second frame member 37 is the same as the first frame member 36, and a description thereof will be omitted.

The rear side frame center portion 26 includes a first frame center member 56 facing the outside of the vehicle 12 and a second frame center member 57 facing the inside of the vehicle 12. The member 56 is joined, the second frame center member 57 is joined to the second frame member 37, and the rear floor panel 31 is sandwiched between the first frame center member 56 and the second frame center member 57.
As shown in FIG. 5, the first frame center member 56 has a substantially U-shaped cross section, overlaps the rear floor rear portion 33, and overlaps the rear floor rear portion 33 with the first flange portion 53 interposed in the vicinity of the end. The first central flange portion 58, the first central vertical side portion 61, the central bottom side portion 63, the second central flange portion 64, and the second central vertical side portion 65 are formed.

Next, the procedure for joining the rear side frame central portion 26, which is a separate member, to the first frame member 36 of the vehicle frame structure 11 according to the embodiment of the present invention will be mainly described with reference to FIG.
The frame structure manufacturing process includes four processes. As shown in FIG. 6, the first frame member plastic working process for plastic working the first frame member 36 and the first frame member 36 shown in FIG. A rear side frame lower part manufacturing process to obtain a rear side frame lower part 71, a rear side frame upper part manufacturing process to obtain a rear side frame upper part 72 by joining a second frame center member 57 to the second frame member 37 of FIG. 4. A rear side frame upper / lower joining step of forming a closed cross section by joining the rear side frame upper part 72 to the rear side frame lower part 71 of FIG. 5 with the rear floor rear part 33 of the rear floor panel 31 being sandwiched therebetween.

  In the rear side frame lower manufacturing process, first, as shown in FIG. 7, the first frame center member 56 of the rear side frame center portion 26 is set on a jig (not shown), and the rear end of the first frame center member 56 is set. By setting the front end of the first frame member 36 in the vertical direction, the first frame member 36 is stacked as shown in FIG.

Next, the spot gun (electrode) 75 of the spot welding device 74 is pressed with the first inclined side portion 45 and the central bottom side portion 63 interposed therebetween, and spot welding is performed.
Similarly, pressure is applied across the second inclined side portion 46 and the center bottom side portion 63, and spot welding is performed.

  The rear side frame upper part manufacturing process is performed in the same manner as the rear side frame lower part manufacturing process, thereby completing the rear side frame upper part 72 of FIGS.

In the rear side frame upper and lower joining step, the left rear side frame lower portion 71 and the right rear side frame lower portion 71 are set in a jig, and a first flange portion 53, a second flange portion 54 formed on the rear side frame lower portion 71, The rear floor panel 31 is placed on the first center flange portion 58 and the second center flange portion 64 and overlapped and restrained, and the flanges of the rear side frame upper portion 72 are similarly overlapped on the rear floor panel 31.
Next, the flanges of the first flange portion 53, the second flange portion 54, the first center flange portion 58, the second center flange portion 64 and the rear side frame upper portion 72 are joined by spot welding. Thus, the vehicle frame structure 11 is almost completed.

  As described above, in the vehicle frame structure 11, as shown in FIG. 7, the first inclined side portion 45 and the first frame central member 56 (central bottom side portion 63) are overlapped, and the overlapped portion is a spot gun (electrode) 75. When pressurizing and energizing, a spot gun (electrode) 75 that is orthogonal to the first inclined side 45 by the inclination of the first inclined side 45 (inner angle is set to an obtuse angle α) with respect to the first vertical side 41 Since it falls down by a desired angle, it does not interfere with the first concave portion 43 of the first vertical side portion 41.

Although the vehicle frame structure 11 of the present invention is employed in the rear part of the floor body of the vehicle 12 in the embodiment, it can also be employed in the center part of the vehicle 12 and the front part of the vehicle 12.
Further, the vehicle frame structure 11 is employed in a frame extending in the front-rear direction of the vehicle 12, but can also be employed in a frame extending in the left-right direction of the vehicle 12 and a frame extending in the vertical direction of the vehicle 12.

  In the first frame central member 56, it is possible to form a recess (not shown) in the first central vertical side portion 61 so as to overlap the first concave portion 43. Similarly, the second central vertical side It is also possible to form a recess (not shown) in the portion 65 so as to overlap with the second recess 44. As a result, the ridge line is further increased by the concave portion, and the amount of shock absorbed in the longitudinal direction of the vehicle frame structure can be increased.

  The vehicle frame structure of the present invention is suitable for the rear part of a vehicle floor body.

  DESCRIPTION OF SYMBOLS 11 ... Frame structure for vehicles, 36 ... 1st frame member, 37 ... 2nd frame member, 41 ... 1st vertical side part, 42 ... 2nd vertical side part, 43 ... 1st recessed part, 44 ... 2nd recessed part, 45 ... 1st inclined side part, 46 ... 2nd inclined side part, 47 ... Top part, 48 ... Bottom side part, 51 ... 3rd recessed part, (alpha) ... Obtuse angle.

Claims (2)

In the vehicle frame structure that is formed by pushing a recess into the side forming the closed cross section toward the inside of the closed cross section,
The closed cross section is formed by closing together a second frame member having a substantially U-shaped cross section with respect to a first frame member having a substantially U-shaped cross section,
In the first frame member, the concave portions are formed in the first vertical side portion and the second vertical side portion facing each other, and the first inclined side portion extending at an obtuse angle is connected to the first vertical side portion, A bottom side portion forming a top portion is formed by integrally joining a second inclined side portion that is connected to the second vertical side portion and extends at an obtuse angle, and the concave portion is formed at the top portion. Vehicle frame structure.   2. The vehicle frame structure according to claim 1, wherein the first frame member is formed by roll foam molding or bend molding.

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