JP4778153B2 - Rear frame structure of the vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a rear frame disposed on both sides of a rear portion of a vehicle.
[0002]
[Prior art]
In general, in the rear structure of an automobile body, a pair of left and right rear frames along both sides of a rear floor panel and a cross member coupled to the left and right rear frames are provided in a ladder shape. These rear frames extend in the front-rear direction of the vehicle, and have a bent portion that is largely bent in a plan view and a side view when attaching a suspension or the like. Usually, since the fuel tank is provided in front of the bent portion, when an impact is applied from the rear of the vehicle, the rear frame may be deformed forward at the bent portion and interfere with the fuel tank.
In order to solve such a problem, for example, in the technique disclosed in Japanese Patent Laid-Open No. 5-8757, the rear frame bent portion is reinforced from the rear side by the vertical frame portions formed at both ends of the rear suspension cross member. Was.
Further, in order to attach the trailing link, which is a component of the rear seat and the suspension, to the rear frame, the rear seat bracket and the trailing link bracket are separately provided in the rear frame.
[0003]
[Problems to be solved by the invention]
However, since the vertical frame portion reinforces the rear frame bent portion that deforms forward due to an impact from the rear of the vehicle, the rear frame bent portion may interfere with the fuel tank. Also, in the vertical frame part, the rear frame bent part is reinforced from the rear side, so the interior of the rear frame becomes hollow, and the cross-sectional deformation of the rear frame due to impact from the side of the vehicle cannot be suppressed. It was necessary to provide a separate separator for reinforcing the cross section of the rear frame.
Further, since the rear seat bracket and the trailing link bracket are separately provided, the number of parts is increased.
[0004]
An object of the present invention is to prevent deformation of a bent portion of the rear frame due to an impact from the rear and to suppress a cross-sectional deformation of the rear frame due to an impact from the side or the like.
Another object of the present invention is to reduce the number of parts by integrating the separator for reinforcing the cross section of the rear frame, the rear seat bracket, and the trailing link bracket.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the invention described in claim 1
For example, as shown in FIGS.
Extending in the longitudinal direction of the vehicle body along the body sides, a rear frame 1 of the closed section having a bent portion 1a is bent inwardly upward and the vehicle body width direction from the front in the fuel tank 8 near over backward,
Cross members 3, 4 connecting these left and right rear frames 1,
In the rear frame structure comprising
A main vertical wall portion 71 positioned substantially along the vehicle longitudinal direction from the side surface portion on the inner side in the vehicle width direction to the side surface portion on the outer side in the vehicle width direction within the cross section of the bent portion 1a, and the front side or the rear side of the main vertical wall portion A reinforcement 7 having a secondary vertical wall 73 that is continuous with at least one side of the side and is positioned substantially along the vehicle body width direction,
The auxiliary vertical wall portion 73 of the reinforcement 7 is arranged along the extended line of the vertical wall portion 41 of the cross member 4.
[0006]
According to the first aspect of the present invention, since the main vertical wall portion of the reinforcement reinforces the bent portion against the load input to the rear frame from the rear due to an impact or the like, the deformation of the bent portion of the rear frame is prevented. Thus, interference with the fuel tank can be prevented.
In addition, the reinforcement sub-vertical wall portion substantially along the extension line of the vertical wall portion of the cross member can prevent cross-sectional deformation with respect to various loads input to the rear frame, and can prevent a load from the outside. Can be transmitted to the cross member.
Furthermore, as reinforcement in the rear frame bent part, the main vertical wall part for reinforcement against the load from the rear and the sub vertical wall part that transmits the load from the outside to the cross member are formed integrally. The score can be reduced.
[0007]
The invention according to claim 2
The vehicle rear frame structure according to claim 1,
For example, as shown in FIGS.
The reinforcement is continuous to the front side of the main vertical wall part and to the rear side of the main vertical wall part as a front side vertical vertical wall part 78 extending outward in the vehicle width direction as the sub vertical wall part. And a rear auxiliary vertical wall portion 73 extending inward in the vehicle body width direction .
[0008]
The invention described in claim 3
The vehicle rear frame structure according to claim 1 or 2,
For example, as shown in FIG. 3 (or FIG. 7),
The reinforcement 7 has a flange-like rear seat mounting portion 74 that is continuous with the upper side of the main vertical wall portion 71 and substantially along the floor panel 5 disposed on the rear frame 1. .
[0109]
According to the third aspect of the present invention, since the reinforcement has a flange-shaped rear seat mounting portion continuous above the main vertical wall portion, it is not necessary to provide a separate rear seat bracket, and the number of components can be reduced. Moreover, the reinforcement by the reinforcement main vertical wall part with respect to the up-down direction load input into a rear seat can improve the luggage compartment partition strength.
[0010]
The invention according to claim 4
A vehicle rear frame structure according to any one of claims 1 to 3,
For example, as shown in FIG.
The reinforcement 7 has a flange-like trailing link attachment portion 75 that is continuous to the lower side of the main vertical wall portion 71 and substantially along the bottom surface portion of the rear frame 1.
[0011]
According to the fourth aspect of the present invention, since the reinforcement has a trailing link mounting portion that is continuous to the lower side of the main vertical wall portion, it is not necessary to provide a separate trailing link bracket, and the number of components can be reduced. . Further, the operability can be improved by reinforcing the reinforcement main vertical wall portion with respect to the longitudinal load input to the trailing link.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
[First Embodiment]
In this embodiment, the rear frame structure of the vehicle is applied to a structure in which the rear frame 1 and the side sill 2 are joined adjacent to each other in the vehicle width direction, as shown in FIGS.
The rear part of the side sill 2 is joined to the front part of the rear frame 1 arranged along the left and right side parts of the vehicle. Cross members 3 and 4 are joined between the left and right side sills 2 and 2 and the rear frames 1 and 1. A rear floor panel 5 is joined to the upper side of the rear frame 1 and the cross members 3, 4, and a front floor panel 6 is joined to the front portion of the rear floor panel 5.
[0014]
The rear frame 1 having a substantially U-shaped cross section is joined to the lower surface of the rear floor panel 5 to form a closed cross section. The front portion of the rear frame 1 is a bent portion 1a that is bent upward and inward in the vehicle body width direction from the front to the rear. A reinforcement 7 serving as a reinforcing member is provided in the closed cross section of the bent portion 1a. A fuel tank 8 is disposed on the inner side in the vehicle width direction of the bent portion 1a.
The side sill 2 is joined from the outside in the order of the outer panel 21, the side sill reinforcement 22, and the side sill inner 23, and the side sill inner rear 24 is joined to the rear part of the side sill inner 23. A rear arch inner 9 and a rear wheel apron 10 constituting the wheel arch portion are joined to the rear portion of the side sill 2.
[0015]
As shown in FIG. 4, the reinforcement 7 is continuous with the main vertical wall portion 71 located in the longitudinal direction of the vehicle body and the rear side thereof, and the side surface outside the vehicle width direction of the bent portion 1 a of the rear frame 1. A connecting vertical wall portion 72 in contact with the portion, and a sub-vertical wall portion 73 that is continuous to the rear and positioned along the vehicle body width direction. The joining vertical wall portion 72 is bent inward in the vehicle width direction from the rear end of the main vertical wall portion 71, and the auxiliary vertical wall portion 73 is bent inward in the vehicle width direction from the rear end of the joining vertical wall portion 72. Yes.
A flange-like rear seat mounting portion 74 is formed at the upper end of the main vertical wall portion 71 and extends inward in the vehicle body width direction along the lower surface of the rear floor panel 5. In the rear seat mounting portion 74, two nuts 74a are fixed to the lower surface by welding to form a mounting hole 74b.
Further, a flange-like trailing link attachment portion 75 extending outward in the vehicle body width direction along the bottom surface portion of the rear frame 1 is formed at the lower end of the main vertical wall portion 71. In the trailing link attachment portion 75, two nuts 75a are fixed to the upper surface by welding, and an attachment hole (not shown) is formed.
A flange portion 76 is formed at the inner end of the sub vertical wall portion 73 so as to be bent rearward along the side surface portion on the inner side in the vehicle body width direction of the rear frame 1.
[0016]
Next, the relationship between the rear frame 1 and the reinforcement 7 will be described.
At the front portion of the bent portion 1a of the rear frame 1, the front end portion of the main vertical wall portion 71 of the reinforcement 7 is fixed to the side surface portion on the inner side in the vehicle width direction by welding, and the vehicle width at the rear portion of the bent portion 1a. A joining vertical wall portion 72 is fixed to the side portion on the outer side in the direction by welding.
The auxiliary vertical wall portion 73 of the reinforcement 7 is disposed so as to be substantially along the extension line of the front vertical wall portion 41 of the cross member 4. It is fixed by welding to the side surface inside in the width direction.
[0017]
Further, the rear seat mounting portion 74 of the reinforcement 7 is fixed to the lower surface of the rear floor panel 5 by welding. A seat rail of a rear seat (not shown) is installed on the upper surface of the rear floor panel 5. That is, the rear seat (seat rail) is attached and fixed by a bolt (not shown) at the nut 74a and the attachment hole 74b of the rear seat attachment portion 74 of the reinforcement 7.
Further, the trailing link mounting portion 75 of the reinforcement 7 is fixed to the bottom surface portion of the rear frame 1 by welding. A trailing link of a suspension component (not shown) is supported on the bottom view of the rear frame 1. That is, the trailing link is pivotally supported by a bolt (not shown) and swingable at the nut 75a and the mounting hole of the trailing link mounting portion 75 of the reinforcement 7.
[0018]
According to the rear frame structure configured as described above, the following operational effects can be obtained.
(1) Since the reinforcement function by the main vertical wall portion 71 of the reinforcement 7 is obtained at the bent portion 1a with respect to a load input to the rear frame 1 from the rear due to an impact or the like, deformation of the rear frame bent portion 1a is prevented. Is done. Therefore, interference with the fuel tank 8 of the rear frame bending part 1a is prevented.
(2) The reinforcement sub-vertical wall 73 substantially along the extension line of the front vertical wall 41 of the cross member 4 prevents cross-sectional deformation with respect to various loads input to the rear frame 1, and A load from the outside due to an impact or the like is transmitted to the cross member 4.
(3) A reinforcement in which the main vertical wall portion 71 for reinforcing the load from the rear and the auxiliary vertical wall portion 73 for transmitting the load from the outside to the cross member 4 are integrally formed in the rear frame bent portion 1a. Because of the ment 7, it is not necessary to provide each reinforcing component separately. Therefore, the number of parts is reduced.
(4) Since the reinforcement 7 integrally includes the rear seat mounting portion 74 and the trailing link mounting portion 75 above and below the main vertical wall portion 71, there is no need to provide separate parts for mounting the rear seat and the trailing link. . Therefore, the number of parts is reduced.
(5) Since the main vertical wall portion 71 of the reinforcement 7 can reinforce the vertical load input to the rear seat, the cargo compartment partition wall strength is improved.
(6) Since the main longitudinal wall 71 of the reinforcement 7 can reinforce the longitudinal load input to the trailing link, the operability is improved.
[0019]
[Second Embodiment]
As shown in FIGS. 5 and 6, this embodiment is obtained by changing the joint portion between the rear frame 1, the side sill 2, and the reinforcement 7 in the first embodiment described above. The same reference numerals are given to the same parts, and descriptions other than the joint parts are omitted.
[0020]
In this embodiment, as shown, the rear frame 1 has a bent portion 1a having a substantially L-shaped cross section and a rear portion 1b having a substantially U-shaped cross section.
The rear frame bent portion 1a has a closed cross section in which a rear arch inner 9 and a rear wheel apron 10 are joined to the outer side in the vehicle body width direction, and a closing plate 11 is joined to the upper side. Further, the rear frame 1 and the side sill 2 are joined so that the closed cross section constituted by the reinforcement side sill 22 and the side sill inner 23 is continuous with the closed cross section of the rear frame bent portion 1a.
Further, the rear portion 1b of the rear frame 1 has a closed cross section formed by joining a closing plate 11 on the upper side.
A reinforcement 7 is provided across the closed cross section of the joint between the rear frame 1 and the side sill 2 described above.
[0021]
In addition to the main vertical wall portion 71, the outer joint vertical wall portion 72, and the rear auxiliary vertical wall portion 73, the reinforcement 7 is provided in the vehicle width direction inner side of the bent portion 1a of the rear frame 1 as shown in FIG. The inner joint vertical wall portion 77 in contact with the side surface portion and the front auxiliary vertical wall portion 78 that is continuous in front of the side wall portion and is positioned along the vehicle body width direction. The inner joint vertical wall 77 is bent from the front end of the main vertical wall 71 outward in the vehicle width direction, and the front auxiliary vertical wall 78 is bent from the front end of the inner joint vertical wall 77 outward in the vehicle width direction. ing.
At the outer end of the front auxiliary vertical wall 78, a flange 79 bent forward is formed along the rear arch inner 9 on the outer side in the vehicle width direction of the rear frame bent portion 1a.
[0022]
In the above, the front side auxiliary vertical wall portion 78 of the reinforcement 7 is disposed along the extension line of the rear side vertical wall portion 31 of the front cross member 3.
And the inner side joining vertical wall part 77 of the front side auxiliary | assistant vertical wall part 78 is being fixed to the inner side surface part in the cross-sectional substantially L shape of the rear frame bending part 1a by welding. Further, a flange portion 79 outside the front auxiliary vertical wall portion 78 is fixed to the rear arch inner 9 and the side sill reinforcement 22 by welding.
[0023]
According to the rear frame structure configured as described above, the following operational effects can be obtained in addition to the operational effects obtained by the first embodiment described above.
(7) The reinforcement sub-vertical wall portion 78 substantially along the extension line of the rear vertical wall portion 31 of the front cross member 3 can also cause cross-sectional deformation with respect to various loads input to the rear frame 1. In addition, a load from the outside due to an impact or the like is transmitted to the cross member 3 as well.
(8) The reinforcement 7 provided across the rear frame 1 and the side sill 2 reinforces the joint between the rear frame 1 and the side sill 2.
[0024]
In addition to the above embodiments, it is needless to say that specific detailed structures and the like can be appropriately changed.
[0025]
【The invention's effect】
According to the first aspect of the invention, the reinforcement main vertical wall portion prevents the rear frame bent portion from being deformed by the reinforcement by the reinforcement main vertical wall portion against the load input to the rear frame from the rear due to impact or the like, and the fuel tank Interference can be prevented.
Further, the reinforcement sub-vertical wall portion can prevent cross-sectional deformation with respect to various loads input to the rear frame, and can transmit the load from the outside to the cross member.
Furthermore, the number of parts can be reduced by integrally forming the main vertical wall portion for reinforcement against the load from the rear and the sub vertical wall portion for transmitting the load from the outside to the cross member.
[0026]
According to the invention described in claim 3, because of the reinforcement having the rear seat mounting portion, in addition to the effect obtained by the invention described in claim 1, the number of parts can be reduced and the strength of the cargo compartment partition wall can be improved. Is obtained.
[0027]
According to the invention described in claim 4, because of the reinforcement having the trailing link mounting portion, in addition to the effect obtained by the invention of claim 1 or 3, the number of parts can be reduced and the operability is improved. The advantage that it can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing a main structure of a rear frame structure according to a first embodiment to which the present invention is applied.
FIG. 2 is a schematic plan view of the main structure of FIG.
3 is a cross-sectional view taken along the lines AA, BB, CC, CC, DD, and EE in FIG. 2, respectively.
4 is a schematic perspective view showing the reinforcement of FIGS. 2 and 3. FIG.
FIG. 5 is a schematic plan view showing a main part structure, showing a second embodiment of a rear frame structure to which the present invention is applied.
6 is a cross-sectional view taken along lines AA, BB, CC, CC, DD, and EE in FIG. 5, respectively.
7 is a schematic perspective view showing the reinforcement of FIGS. 5 and 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rear frame 1a Bending part 2 Side sill 3, 4 Cross member 31 Rear side vertical wall part 41 Front side vertical wall part 5, 6 Floor panel 7 Reinforcement 71 Main vertical wall part 72, 77 Joining vertical wall part 73 Sub vertical wall part 74 Rear seat mounting portion 75 Trailing link mounting portion 78 Sub vertical wall portion 8 Fuel tank

Claims (4)

Extending in the longitudinal direction of the vehicle body along the body sides, and the rear frame of closed section having a bent portion which is bent inwardly upward and the vehicle body width direction from the front in the fuel tank near over backward,
A cross member connecting these left and right rear frames,
In the rear frame structure comprising
In the cross section of the bent portion, a main vertical wall portion positioned substantially along the vehicle longitudinal direction from a side portion on the inner side in the vehicle width direction to a side portion on the outer side in the vehicle width direction, and a front side or a rear side of the main vertical wall portion A reinforcement having a sub-vertical wall portion continuous with at least one side and positioned substantially along the vehicle body width direction;
A rear frame structure for a vehicle, wherein the auxiliary vertical wall portion of the reinforcement is arranged substantially along an extension line of the vertical wall portion of the cross member. The reinforcement, as the sub vertical wall portion, continues to the front side of the main vertical wall portion and extends to the vehicle body width direction outer side, and continues to the rear side of the main vertical wall portion. The vehicle rear frame structure according to claim 1, further comprising a rear auxiliary vertical wall portion extending inward in the vehicle body width direction .   3. The reinforcement according to claim 1, further comprising a flange-like rear seat mounting portion that is continuous with an upper side of the main vertical wall portion and substantially extends along a floor panel disposed on the rear frame. The vehicle rear frame structure described.   4. The reinforcement according to claim 1, further comprising a flange-shaped trailing link mounting portion that is continuous to a lower side of the main vertical wall portion and substantially extends along a bottom surface portion of the rear frame. A vehicle rear frame structure as described above.

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