JP5358597B2 - Frame structure at the rear of the body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a frame structure of a vehicle body rear part capable of enhancing strength-rigidity of a joining part between a side sill and a rear frame. <P>SOLUTION: A front part 13f of the rear frame 13 is formed by inclining outside toward the front side, a rear part 4r of the side sill 4 is joined to the front part of the rear frame 13, the side sill 4 has an inside sill 5 opened toward the side, upper-lower ridgelines 15 and 15 connected by a bottom wall 14 of a rear part of the inside sill 5, have an inside inclined part 21 continuously inclining inside from the outside in the vehicle width direction toward the rear, the rear opening edge of the inside sill 5 has a straight line part 24 formed along a front part of the inside sill 5, a first curved part 25 continuing with the straight line part 24 and projecting outside in the vehicle width direction and a second curved part 26 continuing with the first curved part and projecting inside in the vehicle width direction. A part to the first curved part 25 and the second curved part 26 from the straight line part 24, is blocked up by a cover member 28 from the side. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a frame structure at the rear of a vehicle body.

As the frame structure of the rear part of the vehicle body, both the side sill and the rear frame are formed in a U-shaped cross section. In addition, there is a type in which welding is performed and a jack-up bracket is bonded to the bonded portion (see Patent Document 1).
Further, there is a type in which a vertical wall portion that connects the bottom surface of the rear side member and the rear floor is formed at the rear portion of the side sill inner and a connecting surface is formed at the rear end of the vertical wall portion (see Patent Document 2).

Japanese Patent No. 3454376 Japanese Patent No. 3675571

However, in the former, the rear end portion of the side sill is curved inward and connected to the rear frame, so that the curved portion of the rear end portion of the side sill is the starting point of bending deformation in the event of a vehicle front-rear surface collision. There is a problem of becoming.
In the latter case, the side sill and the rear frame do not have a continuous cross-sectional shape, and a floor panel is used for joining. In order to give the joint part the necessary strength, There is a problem that a sufficient thickness cannot be secured.

  Accordingly, an object of the present invention is to provide a frame structure at the rear of the vehicle body that can increase the strength and rigidity of the joint between the side sill and the rear frame.

  In order to achieve the above object, the invention described in claim 1 is directed to a front portion (for example, implementation) of a pair of rear frames (for example, the rear frame 13 in the embodiment) disposed at the rear portion of the vehicle body along the longitudinal direction of the vehicle body. The front portion 13f) in the form is formed so as to be inclined outwardly toward the front side, and the rear portion (for example, the rear portion 4r in the embodiment) of the side sill (for example, the side sill 4 in the embodiment) is joined to the front portion of the rear frame. In the vehicle body rear structure, the side sill includes an inside sill (for example, the inside sill 5 in the embodiment) having a hat-shaped cross section that is open toward the side, and a bottom wall (for example, implementation) of the rear portion of the inside sill. The vehicle width direction as the upper and lower ridge lines (for example, the ridge line 15 in the embodiment) connected by the bottom wall 14) in the form move backward. An inner inclined portion (for example, the inner inclined portion 21 in the embodiment) continuously inclined from the outside to the vehicle width direction inside is provided, and the opening edge of the rear portion of the inside sill is formed along the front portion of the inside sill A linear portion (for example, the linear portion 24 in the embodiment) and a first curved portion (for example, a curved portion so as to be convex outward in the vehicle width direction provided at a position facing the inner inclined portion continuously to the linear portion. The first curved portion 25 in the embodiment, and the outer curved portion (for example, in the embodiment) of the front portion of the rear frame, which is curved so as to be convex inward in the vehicle width direction continuously to the first curved portion. A second bending portion (for example, the second bending portion 26 in the embodiment) connected to the outer inclined portion 27), and a portion from the straight portion to the first bending portion and the second bending portion is a lid from the side. Member (for example, in the embodiment Characterized in that it is closed by a member 28).

  According to a second aspect of the present invention, the rear portion of the inside sill is formed in a shape bulging laterally from the bottom wall by the straight portion, the first curved portion, and the second curved portion, and A bracket (for example, the outer panel mounting bracket 40 in the embodiment) having a reference hole (for example, the reference hole 42 in the embodiment) for coupling the outer panel (for example, the outer panel 7 in the embodiment) constituting the side wall of the vehicle body on the lower surface of the side sill. ) Are joined so as to form a closed section (for example, a closed section H in the embodiment) along the ridgeline.

  The invention described in claim 3 is characterized in that the ridgeline of the inside sill is vertically symmetrical.

  According to the fourth aspect of the present invention, the upper end portion (for example, the upper end portion 30 in the embodiment) of the lid member is joined to the outer panel constituting the side wall of the vehicle body to join the door seal flange portion (for example, the door seal flange portion in the embodiment). 47).

  The invention described in claim 5 is characterized in that the bracket is joined over the bottom wall of the inside sill and the lower surface of the lower wall (for example, the lower wall 23 in the embodiment).

According to the first aspect of the present invention, the closed cross section can be continued from the rear frame to the side sill and the rear portion of the side sill is formed to project outward, and the portion projecting outward is the lid member. Because it is closed, it is possible to receive a load acting from the rear at the time of a vehicle rear surface collision with a strength-advantaged closed cross-section that continues from the rear frame to the side sill, and a curved portion that protrudes outward is formed between the side sill and the rear frame. It is possible to increase the strength and rigidity of the joint portion between the rear frame and the side sill by preventing the connection portion from bending toward the inside in the vehicle width direction and preventing the bending portion from starting.
Further, since the collapse of the closed cross-sectional shape can be suppressed by the lid member, a high reaction force at the time of a vehicle rear surface collision can be generated. Therefore, since the energy absorption effect in the part extending from the rear frame to the side sill can be enhanced, it is possible to reduce the weight of the vehicle body such that the plate thickness can be reduced accordingly.
Furthermore, since the collapse of the closed cross-sectional shape can be suppressed by the lid member, the bending rigidity in the portion from the rear frame to the side sill is increased, and the riding comfort performance can be improved.
According to the second aspect of the invention, the closed cross section along the ridge line of the inside sill is formed by the bracket, so that the input load at the time of the vehicle rear surface collision can be transmitted from the rear frame to the side sill.
According to the invention described in claim 3, the strength and rigidity of the inside sill can be increased.
According to the fourth aspect of the invention, the upper end of the lid member is extended to the peripheral position of the door mounting opening (for example, the rear side door opening 33 in the embodiment) of the outer panel constituting the side wall of the vehicle body. The door seal flange portion can be formed without affecting the above. In other words, when the outer panel is joined along the inside sill without providing a lid member, the position of the flange portion for the door seal set on the outer panel has to be lowered to the position of the inside sill, which restricts the appearance of the vehicle body. It will end up. Conversely, when design is prioritized, it becomes difficult to increase the rigidity of the joint between the rear frame and the inside sill. That is, in order to ensure sufficient rigidity, the weight of the vehicle body is increased.
According to the fifth aspect of the present invention, the ridge line on the lower side of the inside sill can be covered with the bracket and can be continued without interruption.

It is a bottom view of the vehicle body floor according to the embodiment of the present invention. It is a top view of the connection part of the inside sill and rear frame of the said embodiment. It is a perspective view of the connection part of the inside sill and rear frame of the above-mentioned embodiment. It is a side view of a side sill and a rear frame of the above-mentioned embodiment. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is the perspective view seen from the vehicle interior side of the said embodiment. It is the perspective view which looked at the vehicle body floor of the said embodiment from the lower right left side. It is sectional drawing which follows the CC line of FIG. It is the perspective view which cut | disconnected by CC line of FIG. 7, and looked back. It is a perspective view which shows the member for jackup.

Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1 as a bottom view, the vehicle body floor includes a front floor 1 at the front of the vehicle body and a rear floor 2 at the rear of the vehicle body connected to the front floor 1. A floor tunnel portion 3 is formed to bulge upward in the center of the front floor 1 in the vehicle width direction. Side sills 4 and 4 which are vehicle body skeleton members are attached to both sides of the front floor 1. The side sill 4 has a closed cross-sectional structure composed of an inside sill 5 and a stiffener 6, and an outer panel 7 is joined to the outside thereof.
Here, in FIG. 1, the right side of the front floor 1 shows the inside sill 5, and the left side of the front floor 1 shows the outer panel 7 that constitutes a vehicle body side wall that covers the inside sill 5 and a stiffener 6 to be described later.

A dashboard lower panel (not shown) that rises upward is joined to the front end of the front floor 1, and a dashboard cross member 8 is joined to the back side of the connecting portion between the front floor 1 and the dashboard lower panel. On both sides of the floor tunnel portion 3 and on the back surface of the front floor 1, tunnel frames 9, 9 having a hat-shaped cross section that form a closed cross-section structure portion between the front floor 1 and the front floor 1 are joined along the longitudinal direction of the vehicle body. Has been. Further, tunnel reinforcing members 10 and 11 are attached to the back side of the floor tunnel portion 3 in the front-rear direction so as to straddle the tunnel frames 9 and 9 along the vehicle width direction.
A rear portion of the rear end portion of the front floor 1 is raised at the rear, and a middle cross member 12 that forms a closed cross-section structure portion is joined to the back side of the joint portion in the vehicle width direction. .

  On the rear surface of the rear floor 2, rear frames 13 having a closed cross-section structure portion are arranged on the left and right along the longitudinal direction of the vehicle body. The rear frames 13, 13 are provided at positions higher than the side sills 4, 4 with an arrangement interval narrower than the arrangement intervals of the side sills 4, 4. The rear frame 13 is formed so as to be inclined outward (see FIGS. 1 to 3) and downward (see FIG. 4) as the front portion 13f is directed to the front side, and is formed on the front portion 13f of the rear frame 13. The rear portion 4r of the side sill 4 is joined so that the closed cross section continues from the side sill 4 to the rear frame 13.

  As shown in FIGS. 5 and 6, the rear frame 13 is formed in a closed cross-sectional structure by flange-joining the upper member 16 and the lower member 17. Specifically, up to the front of the spare tire pan 18 (see FIG. 1) located at the rear of the rear floor 2, as shown in FIG. As shown in FIG. 6, the joint flanges 19 and 19 are set at the center in the vertical direction on both the vehicle exterior side and the vehicle interior side.

As shown in FIGS. 2 to 4 and 7, the side sill 4 includes an inside sill 5 having a hat-shaped cross-section that is open toward the side. The bottom wall 14 of the inside sill 5 connects the upper and lower symmetrical ridge lines 15 and 15 in the vertical direction, and the bottom wall 14 is located inside the vehicle width direction.
The upper and lower ridge lines 15 and 15 of the inside sill 5 of the side sill 4 include an inner inclined portion 21 that continuously inclines from the outer side in the vehicle width direction to the inner side in the vehicle width direction as it goes rearward. That is, the inside sill 5 is a rear portion 4r of the general portion 20 that extends straight rearward, and is an inner inclined portion 21 in which the bottom wall 14 is inclined inward in the vehicle width direction and is also bent obliquely upward.

  Thus, the inside sill 5 that is bent upward and inclined inward is joined so as to be inclined outward as it goes to the front side and to the front portion 13f of the rear frame 13 that is inclined downward. That is, the vehicle interior side wall of the front portion 13 f of the rear frame 13 is inclined so as to be linearly connected to the inner inclined portion 21 that is the upper and lower ridgelines 15 of the bottom wall 14 of the inside sill 5. Two bulkheads BH for closing the internal closed cross section are provided behind the front portion 13f of the rear frame 13. C in FIG. 4 shows a console box attached to the upper part of the floor tunnel portion 3.

The opening edge of the rear portion 4r of the inside sill 5, that is, the side edge of the upper wall 22 and the lower wall 23, the bottom wall 14 is the inner inclined portion 21, whereas the general portion 20 of the inside sill 5 is A linear portion 24 that linearly extends rearward, a first curved portion 25 that is provided at a position facing the inner inclined portion 21 continuously to the linear portion 24 and curves so as to protrude outward in the vehicle width direction; A second curved portion 26 that is curved so as to be convex inward in the vehicle width direction continuously to the first curved portion 25 and connected to the outer inclined portion 27 that is a wall on the outer side of the passenger compartment of the front portion 13f of the rear frame 13; I have.
Accordingly, the rear portion 4r of the inside sill 5 is positioned laterally from the bottom wall 14 as shown in FIG. 2 by the straight portion 24, the first bending portion 25, and the second bending portion 26, as shown in FIG. It will be formed in a bulging shape.

A lid member 28 that closes the opening edge of the inside sill 5 is provided on the upper wall 22 and the lower wall 23 of the inside sill 5 at the portion from the straight portion 24 of the inside sill 5 to the first bending portion 25 and the second bending portion 26. It is joined to the provided flange portion 35.
Unlike the lower wall 23 that rises, the lower end portion 29 of the lid member 28 extends linearly rearward as it is, unlike the lower wall 23 that rises, and the upper end portion 30 of the lid member 28 is rearward of the inside sill 5. In the portion that rises, the upper side of the upper wall 22 that rises is formed so as to rise further obliquely upward and rearward. The lower end portion 29 and the upper end portion 30 of the lid member 28 are aligned with the front edge 32 of the wheel arch portion 31 and the rear edge 34 of the rear side door opening portion 33 of the outer panel 7 shown by a chain line in FIG. ing.
Therefore, the upper end portion 30 of the lid member 28 is joined to the back surface of the outer panel 7 to form a door seal flange portion 47.
In FIG. 7, reference numeral 50 denotes a rear cross member that connects the rear frames 13 and 13 and is joined to the rear floor 2.

  As shown in FIG. 8, an outer panel assembling bracket 40 is joined to the lower surface of the lower wall 23 of the portion that rises toward the rear of the inside sill 5 so as to partially straddle the bottom wall 14. The outer panel assembling bracket 40 includes a peripheral flange portion 39 joined to the inside sill 5, and a central portion in the front-rear direction is bulged, and the lower wall 23 and the bottom are covered so as to cover the lower ridge line 15 of the inside sill 5. A peripheral flange 39 is joined to the wall 14 to form a closed section H along the lower ridge line 15 of the inside sill 5. The outer panel assembly bracket 40 includes a hook locking hole 41 for traction on the front side, and a reference hole 42 for coupling when the outer panel 7 is attached to the front side of the hook locking hole 41. The periphery of the reference hole 42 is formed to bulge.

  A part of the outer panel assembling bracket 40 partially overlaps, and a bracket 40 'flanged to the lower wall 23 of the inside sill 5 is connected to the rear of the outer panel assembling bracket 40, and partly overlaps the bracket 40'. A subframe assembling bracket 44 having a peripheral flange 43 is joined so as to straddle the front portion 13 f of the rear frame 13. A stud bolt 45 projects downward from the subframe assembly bracket 44. The sub-frame mounting bracket 44 is also bulged around the stud bolt 45 and covers the lower wall 23 and the bottom wall 14 of the inside sill 5 and the rear frame 13 so as to cover the lower ridge line 15 of the inside sill 5. A peripheral flange portion 43 is joined to the lower wall and the bottom wall. Although not shown, the subframe is a unit component in which a rear wheel and a suspension component are integrated in a small assembly.

  As shown in FIGS. 9 and 10, the lower portion of the lid member 28 and the vicinity of the lower end portion 29 are joined to the flange portions 35 provided on the upper and lower sides of the inside sill 5. On the outside of the lid member 28, a hat-shaped cross-sectional stiffener 36 is joined to the lid member 28 by upper and lower flange portions 37, 37. The upper flange portion 37 is joined to the lower side of the flange portion 35 of the upper wall 22 of the inside sill 5, and the lower flange portion 37 is joined to the joining position of the flange portion 35 of the lower wall 23 of the inside sill 5. .

  Then, the lower flange 38 of the outer panel 7 is joined so as to overlap with the lower flange portion 37 of the stiffener 36, and the upper flange 46 of the outer panel 7 is joined to the upper edge of the upper end portion 30 of the lid member 28. 46 and the upper edge of the upper end 30 of the lid member form a rear side door opening 33, and the outer surface of the rear side door opening 33 forms a door seal flange 47.

  An outer panel assembly bracket 40 is attached to the lower surface of the lower wall 23 of the inside sill 5, and a subframe assembly bracket 44 is attached to a portion extending from the lower surface of the lower wall 23 of the inside sill 5 to the lower surface of the rear frame 13. Therefore, the inside sill 5 forms a closed cross section H along the lower ridge line 15 between the lower wall 23, the outer panel mounting bracket 40 and the subframe mounting bracket 44. The rear floor 2 is joined to the ridgeline 15 at the top of the inside sill 5 via a bracket 48. In FIG. 10, 51 indicates a wheel house inner.

  As shown in FIG. 11, on the front side of the lid member 28, similarly to the lid member 28, a plate-like jack-up member 49 that is vertically long is sandwiched and joined at a position where the inside sill 5 is closed. The position of the jack-up member 49 is such that the upper and lower flange portions 35 and 35 of the inside sill 5, the upper and lower flange portions 37 and 37 of the stiffener 36, the upper flange 46 and the lower flange 38 of the outer panel 7 are overlapped with each other. Therefore, the upward load acting on the jackup member 49 can be reliably received by the inside sill 5, the stiffener 36, and the outer panel 7.

  According to the above embodiment, the closed cross section can be continued from the rear end portion of the rear frame 13 to the side sill 4, and the rear portion 4 r of the side sill 4 protrudes outward by the first curved portion 25 and the second curved portion 26. Since the portion projecting outward is closed by the lid member 28, a closed cross-section that is advantageous in terms of strength, in which the load acting on the rear portion of the vehicle body is applied from the rear frame 13 to the side sill 4 in the event of a vehicle rear surface collision. Can be received at. In other words, the load transmitted from the rear frame 13 to the front side is smoothly transmitted from the vehicle interior side wall of the front portion 13f of the rear frame 13 to the inner inclined portion 21 of the inside sill 5 on the vehicle interior side, and on the vehicle exterior side. It is transmitted from the outer inclined portion 27 of the rear frame 13 to the straight portion 24 of the inside sill 5, that is, the side sill 4 through the first bending portion 25 and the second bending portion 26 whose cross-sectional shape is prevented by the lid member 28. .

  Further, the curved portion protruding outward by the first curved portion 25 and the second curved portion 26 opposes the bending inward in the vehicle width direction of the connecting portion of the side sill 4 and the rear frame 13, and eliminates the starting point of the bending. The strength and rigidity of the joint between the rear frame 13 and the side sill 4 can be increased.

And since the collapse of the closed cross-sectional shape of the inside sill 5 can be suppressed by the lid member 28, a high reaction force can be generated at the time of a vehicle rear surface collision, and the energy absorption effect in the portion from the rear frame 13 to the side sill 4 is enhanced. As a result, the weight of the vehicle body can be reduced.
Furthermore, since the collapse of the closed cross-sectional shape can be suppressed by the lid member 28, the bending rigidity in the portion from the rear frame 13 to the side sill 4 is increased, and the riding comfort performance can be improved.

The rear part of the inside sill 5 is formed in a shape bulging laterally from the bottom wall 14 by the straight part 24 of the inside sill 5 and the first and second curved parts 25 and 26, and the lower wall 23 of the inside sill 5. An outer panel mounting bracket 40 having an outer panel coupling reference hole 42 used when the outer panel 7 constituting the vehicle body side wall is coupled to the lower surface of the vehicle body is joined so as to form a closed cross section along the ridgeline 15. For this reason, the side sill 4 and the outer panel mounting bracket 40 form a closed cross section along the lower ridge line 15 of the inside sill 5.
Therefore, the input load at the time of the vehicle rear surface collision can be transmitted from the rear frame 13 to the side sill 4 as shown by the arrow in FIG.

  Since the outer panel mounting bracket 40 is joined to the bottom wall 14 of the inside sill 5 and the lower surface of the lower wall 23, the lower ridge line 15 of the inner sill 5 is covered with the outer panel mounting bracket 40 and cut off. Can be continued without any problems.

Here, since the ridgeline 15 of the inside sill 5 is symmetrical on the upper side and the lower side, the strength and rigidity of the inside sill 5 can be increased.
Since the upper end portion 30 of the lid member 28 is joined to the outer panel 7 constituting the side wall of the vehicle body to form a door seal flange 47, the upper end portion 30 of the lid member 28 is used as the rear side door opening of the outer panel 7 constituting the side wall of the vehicle body. By extending to the peripheral position of 33, the door seal flange portion 47 can be formed without affecting the vehicle body design. That is, when the outer panel 7 is joined along the inside sill 5 without providing the lid member 28, the position of the door seal flange 47 set on the outer panel 7 must be lowered to the position of the inside sill 5, This limits the appearance of the car body. On the other hand, when design is prioritized, it is difficult to increase the rigidity of the joint between the rear frame 13 and the inside sill 5. That is, in order to ensure sufficient rigidity, the weight of the vehicle body is increased.

13 Rear frame 13f Front part 4 Side sill 4r Rear part 5 Inside sill 14 Bottom wall 15 Edge line 21 Inner slope part 24 Straight line part 25 First curved part 27 Outer slope part 26 Second curved part 28 Lid member 7 Outer panel 42 Reference hole 40 Outer panel assembly Attached bracket (bracket)
H Closed section 30 Upper end 47 Door seal flange 23 Lower wall 33 Rear side door opening

Claims (5)

  In a vehicle body rear structure in which a front portion of a pair of rear frames arranged along the vehicle body longitudinal direction at the rear portion of the vehicle body is inclined outwardly toward the front side, and the rear portion of the side sill is joined to the front portion of the rear frame. The side sill is provided with an inside sill having a hat-shaped cross section that is open to the side, and the upper and lower ridge lines connected by the bottom wall of the rear part of the inside sill are directed from the outside in the vehicle width direction toward the rear. An inner inclined portion continuously inclined inward, and an opening edge of a rear portion of the inside sill is formed along a front portion of the inside sill, and the inner inclined portion is continuous with the linear portion. A first bending portion that is provided at an opposing position and curves so as to protrude outward in the vehicle width direction, and is curved so as to protrude inward in the vehicle width direction continuously to the first bending portion; A second bending portion connected to an outer inclined portion of the first portion, and a portion from the straight portion to the first bending portion and the second bending portion is closed by a lid member from the side. Rear frame structure.   The straight portion, the first curved portion, and the second curved portion form a rear portion of the inside sill that bulges laterally from the bottom wall, and forms a vehicle body side wall on the lower surface of the inside sill. The frame structure for a rear part of a vehicle body according to claim 1, wherein a bracket having a reference hole for connecting the outer panel is joined so as to form a closed cross section along the ridgeline.   The frame structure of the rear part of the vehicle body according to claim 2, wherein the ridgeline of the inside sill is vertically symmetrical.   The frame structure of the rear part of the vehicle body according to any one of claims 1 to 3, wherein an upper end portion of the lid member is joined to an outer panel constituting a vehicle body side wall to form a door seal flange portion.   The frame structure of the rear part of the vehicle body according to any one of claims 2 to 4, wherein the bracket is joined across the bottom wall and the lower surface of the lower wall of the inside sill.

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