JP2005001473A - Body lower part structure of car - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a body lower part structure of a car for dispersing to a side sill impact load applied at rear collision and preventing deformation of a rear side frame to secure safety of an occupant. <P>SOLUTION: A side sill inner 14a of the side sill 14 expands to a vehicle inner side of a front side of the side sill inner 14a, and the expanded part extends to a rear end of the side sill inner 14a. The expanded part of the side sill inner 14a is connected to a front end of the rear side frame 20 to form a frame structure with the side sill inner 14a and the rear side frame 20 continued in the vehicle longitudinal direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lower body structure of an automobile.
[0002]
[Prior art]
Conventionally, RV vehicles (recreational vehicles) have a rear frame at the rear of the vehicle body to ensure the strength and rigidity of the vehicle body such as the floor. For example, as shown in FIG. 11, the left and right first side members 3 are joined to the rear side lower back member 2 in the front-rear direction of the vehicle, and the second side members are connected to the first side members 3. 4, the front ends of the second side members 4 are joined to the rear side surfaces of the left and right rockers 5, and between the left and right second side members 4, a first cross member 6, a second cross member 7, It is known that the third cross member 8 is joined, and the rear under lean reinforcement 10 is joined between the first cross member 6 and the under lean reinforcement 9 of the front frame (Patent Document 1). reference).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-289645
[Problems to be solved by the invention]
When the vehicle having the rear frame 1 configured as described above undergoes a rear collision, the second side member 4 is buckled and deformed when the collision load at the time of the rear collision exceeds a predetermined limit. Thus, when the second side member 4 is deformed at the time of a rear collision, the rear seat on the upper surface of the rear floor pan (not shown) attached to the rear frame 1 greatly moves forward and the cabin space is reduced. It may be disadvantageous to secure safety. In response to this problem, Patent Document 1 discloses a structure in which a reinforcing member is provided between the second cross member 7 and the front frame.
[0005]
An object of the present invention is to adopt a frame structure different from the structure disclosed in Patent Document 1 to disperse the collision load received at the time of a rear collision to the side sill and prevent the rear side frame from being deformed. An object of the present invention is to provide a lower body structure of an automobile for ensuring safety.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention disperses the collision load received at the time of rear collision to the side sill by connecting the rear end of the side sill and the front end of the rear side frame to form a frame structure continuous in the longitudinal direction of the vehicle body. The rear side frame was prevented from being deformed.
[0007]
That is, the invention according to claim 1 is a lower body structure of an automobile provided with rear side frames extending forward from the rear end of the floor and connected to left and right side sills on the left and right under the floor of the rear of the automobile,
The side sill includes a side sill outer and a side sill inner,
The side sill is formed with a recess extending in the front-rear direction of the vehicle body that is opened on the outer surface of the side sill outer, and a rail for a sliding door is disposed in the recess, and the rail has a front portion that is a vehicle body with respect to the rear portion. Is displaced inside,
In the side sill inner, a portion of the rail with respect to the front portion displaced toward the inside of the vehicle body bulges inside the vehicle body from the front side of the side sill inner, and the bulging portion extends to the rear end of the side sill inner.
The bulging portion of the side sill inner is connected to the front end of the rear side frame so as to form a frame structure in which the side sill inner and the rear side frame are continuous in the front-rear direction.
[0008]
Therefore, according to the present invention, the swelled portion of the side sill inner is connected to the front end of the rear side frame so as to form a frame structure in which the side sill inner and the rear side frame are continuous in the front-rear direction. The collision load at the time of collision is transmitted straight from the rear side frame to the side sill, minimizing the generation of force acting in the direction of bending the frame, which is advantageous in preventing deformation of the rear side frame and the occupant Can be secured.
[0009]
According to a second aspect of the present invention, there is provided the lower body structure of an automobile according to the first aspect,
The rear side frame is displaced inward of the vehicle body with respect to the front side portion of the side sill,
In the side sill inner, at least the rear end portion of the bulging portion is formed by a frame member different from the front side portion of the side sill inner, and the frame member is connected to the rear side frame,
Frame members forming rear end portions of the bulging portions of the left and right side sills are connected to each other by a cross member.
[0010]
Therefore, according to the present invention, at least the rear end portion of the bulging portion of the side sill inner is formed by a frame member different from the front side portion of the side sill inner, and the frame member is connected to the rear side frame. Even if the frame is displaced to the inside of the vehicle with respect to the front part of the side sill, both the frame members can be easily shaped by forming a frame structure in which the side sill inner and the rear side frame are continuous in the front-rear direction. Can be connected to. Furthermore, the collision load at the time of rear collision of the vehicle is transmitted straight from the rear side frame to the side sill, so that the generation of force acting in the direction of bending the frame can be minimized, which is advantageous in preventing deformation of the rear side frame. At the same time, the safety of passengers can be ensured.
[0011]
In addition, since the frame members forming the rear end portions of the left and right side sill bulges are connected by a cross member, the frame member and the rear side frame are deformed by the impact load at the time of rear-end collision between the frame member and the rear side frame. The frame structure is advantageous in preventing the starting point and is strong against the impact load of the side collision.
[0012]
The invention according to claim 3 is the lower body structure of an automobile according to claim 1 or 2,
Front side frames extending in the front-rear direction are provided on the left and right under the floor of the front of the car,
The front side frame has a rear end extending to a position where the inside of the side sill inner overlaps the bulging portion,
Each of the left and right front side frames and the bulging portion disposed outside the left and right front side frames are connected by a second cross member.
[0013]
Therefore, according to the present invention, each of the left and right front side frames and the bulging portion of the side sill inner disposed on the outside thereof are connected by the second cross member. In contrast to the strong frame structure, the impact load at the time of rear collision can be distributed from the side sill to the front side frame side, which is advantageous in minimizing the deformation of the rear side frame.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a perspective view showing an appearance of an automobile 11 according to the present embodiment. The rear seat side of the automobile 11 has a structure that is opened and closed by a slide door 12, and a slide door rail 15 that guides a roller (not shown) of the slide door 12 is disposed on each of the roof side rail 13 and the side sill 14. Yes. Reference numeral 40 denotes a center pillar which stands between the front seat entrance and the rear seat entrance and connects the roof side rail 13 and the slide door rail 15.
[0016]
FIG. 2 is a plan view showing the lower body structure of the automobile 11. In the following description, descriptions indicating directions such as front, rear, left and right are based on directions such as front, rear, left and right of the vehicle body. As shown in FIG. 2, rear side frames 20 extending forward from the rear end of the vehicle body are disposed on both left and right sides, and the front ends of the rear side frames 20, 20 form the rear ends of the side sills 14, 14. It is connected to the members 21 and 21. Further, two front side frames 22 and 22 extending in the front-rear direction are arranged at an interval in the vehicle width direction on the vehicle inner side than the side sills 14 and 14 below the floor of the front of the automobile.
[0017]
The left and right rear side frames 20 and 20 are connected by a rear cross member 26, the left and right frame members 21 and 21 are connected by an intermediate cross member 27, and the left and right side sills 14 and 14 are connected by a side sill member 28. The left and right front side frames 22, 22 and the side sills 14, 14 arranged on the outside thereof are connected by front cross members (second cross members) 29, 29.
[0018]
As shown in FIG. 3, the side sill 14 includes a side sill inner 14 a provided on the inner side in the vehicle width direction and a side sill outer 14 b provided on the outer side in the vehicle width direction. The side sill inner 14 a A flange is formed on each of the upper edge and the lower edge of the side sill outer 14b, and these flanges are joined together to form a closed section.
[0019]
The side sill outer 14b is provided with an opening 30 extending in the longitudinal direction of the vehicle body, and a bracket (recess) 31 that is recessed from the opening 30 to the inside of the side sill 14 and has a substantially U-shaped cross section. Is provided. A slide door rail 15 having a concave cross section that is open at the bottom is attached to the inside of the upper surface of the bracket 31. Further, the bracket 31 bulges to the vehicle inner side from the rear part in the vicinity of the front part, and the slide door rail 15 provided on the inner side of the upper surface of the bracket 31 has a front part with respect to the rear part along the bulged shape. It is displaced inside the car. Further, in the side sill inner 14a, a portion corresponding to the front portion of the slide door rail 15 displaced toward the inside of the vehicle swells to the inside of the vehicle from the front side of the side sill inner 14a, and the bulging portion extends to the rear end of the side sill inner 14a. It is installed.
[0020]
As a result, the sliding door slides along the sliding door rail 15 so that when the door is at the front end of the rail, the sliding door is pulled in to the inside of the vehicle to close the entrance, and as it slides backward, it moves to the outside of the vehicle. The entrance is opened.
[0021]
Further, the lower edge of the outer side of the bracket 31 is joined to a reinforcing member 34 that reinforces the side sill 14 by forming a closed cross section that extends in the vehicle longitudinal direction of the side sill 14 together with the side sill outer 14b. As described above, the reinforcing member 34 is joined to the side sill outer 14b and the lower outer edge of the bracket 31 as described above, and the lower edge is sandwiched between the flanges of the lower sill inner 14a and side sill outer 14b. In this state, they are joined together.
[0022]
The center pillar 40 includes a pillar outer 41 provided on the outer side of the vehicle and a pillar inner 42 provided on the inner side of the vehicle, and flanges are formed in the longitudinal direction of the vehicle body between the pillar outer 41 and the pillar inner 42, although not shown. These flanges are joined together to form a closed section. Further, a reinforcing plate 43 is provided between the pillar outer 41 and the pillar inner 42 to reinforce the center pillar 40 by connecting the two. Then, the pillar outer 41 and the side sill outer 14b are joined, and the pillar inner 42 and the flange at the upper edge of the side sill inner 14a are joined, so that the center pillar 40 is attached to the side sill 14. Further, the upper outer edge of the bracket 31 is superposed and joined to the joint portion between the pillar outer 41 and the reinforcing plate 43.
[0023]
A gusset 35 is provided on the lower surface of the bracket 31 on the vehicle inner side. The gusset 35 has an upper edge joined to the inner surface of the bracket 31 and a lower edge joined to the reinforcing member 34.
[0024]
Further, the front side frame 22 disposed on the vehicle inner side than the side sill 14 is made of a member having a substantially concave cross section with an upper opening, and has a bent upper end to form a flange. It is joined to the lower surface of the floor pan 50 to form a closed cross section. As shown in FIG. 2, the rear end of the front side frame 22 extends to a position that overlaps with a portion that swells to the vehicle inner side from the front portion of the side sill inner 14 a. , 22 and the swelled portions of the side sill inners 14a, 14a disposed on the outside thereof are connected by front cross members 29, 29, as shown in FIG. It is formed by combining a plurality of members. Specifically, the front part member 16a having a substantially U-shaped cross section forming the front part of the side sill inner 14a, and the vehicle interior side than the front part member 16a of the side sill inner 14a. A bottom surface portion 16b, a first vehicle interior side surface portion 16c, a second vehicle interior side surface portion 16d, and a bulge portion of the side sill inner 14a. And a first upper surface portion 16e and the second top surface portion 16f form a top surface.
[0025]
The frame member 21 that forms the rear end of the side sill inner 14a includes a frame member inner 21a, an upper surface plate 21b, and a frame member outer 21c (shown in FIG. 5). The vehicle interior side wall of the frame member inner 21a is curved so that the rear portion faces the vehicle exterior side. And as shown in FIG. 5, the upper end of the vehicle inner side wall of the frame member inner 21a is bent to form a flange, and the upper surface plate 21b is joined to the flange. The frame member outer 21c provided on the outer side in the vehicle width direction, the frame member inner 21a and the upper surface plate 21b are joined to form a closed cross section. Further, inside the frame member 21, a reinforcing rib 21d that connects and reinforces the vehicle inner side wall of the frame member inner 21a and the frame member outer 21c, a bottom surface of the frame member inner 21a and a vehicle interior A reinforcing plate 21e is provided which is fixed to the side wall and reinforces the frame member inner 21a.
[0026]
Further, the rear portion of the side sill outer 14b extends to the rear end of the frame member 21, and the rear portion of the upper edge of the bracket 31 is extended upward to form a flange on the upper edge of each of the frame member outer 21c and the side sill outer 14b. They are joined together in a sandwiched state to form a closed cross section.
[0027]
Further, as shown in FIG. 2, the intermediate cross member 27 that connects the left and right frame members 21 and 21 is joined to the inner side surfaces of the left and right frame members 21 and 21. Then, after extending obliquely upward from both ends of the intermediate cross member 27 toward the vehicle inner side, an intermediate portion extending horizontally in the vehicle width direction is formed to be positioned above the upper surface of the frame member 21. Has been. As shown in FIG. 6, a member reinforcing member 27a is disposed so as to straddle the frame member 21 and the intermediate cross member 27, and both ends of the member reinforcing member 27a are respectively connected to the frame member 21 and the intermediate cross member. It is joined to the member 27.
[0028]
As shown in FIG. 7, the rear side frame 20 is made of a member having a substantially concave cross section with an upper opening, and the upper end is bent to form a flange. The flange and the lower surface of the rear floor pan 51 are joined and closed. It constitutes a cross section. Further, as shown in FIG. 2 or FIG. 4, a suspension for attaching a suspension that absorbs the shaking of the vehicle body due to the unevenness of the traveling surface when the vehicle travels in the vicinity of the rear wheel arrangement position of the vehicle at the rear end of the side sill 14. A support plate 25a is attached, and a suspension attachment 25b is provided below the support plate 25a.
[0029]
Further, as shown in FIG. 8, the front of the frame is bent so that the front part of the rear side frame 20 is positioned below the rear part. As shown in FIG. 9, the front side of the vehicle outer side wall 20b of the rear side frame 20 is notched, and the front end of the vehicle outer side wall 20b is located behind the front end of the vehicle inner side wall 20a.
[0030]
Further, the rear side frame 20 is displaced inward of the vehicle body from the front side portion of the side sill inner 14a, and the frame member inner 21a of the frame member 21 forming the rear end of the side sill inner 14a is connected to the rear side frame 20. Thus, a frame structure in which the side sill inner 14a and the rear side frame 20 are continuous in the front-rear direction is formed. That is, the rear end of the second vehicle interior side surface portion 16d at the front end portion of the side sill inner 14a and the front end of the vehicle interior side wall of the frame member inner 21a are joined in a superposed state, and the rear portion of the vehicle interior side wall of the frame member inner 21a is joined. The vehicle inner wall of the frame member inner 21a and the vehicle inner wall 20a of the rear side frame 20 are overlapped and joined in a state where the surface curved toward the vehicle outer side is in contact with the front end of the vehicle outer wall 20b of the rear side frame 20. . Furthermore, as shown in FIG. 10, the bottom of the frame member inner 21 a is overlapped and joined to the upper surface of the bottom of the rear side frame 20.
[0031]
Thereby, the collision load applied to the rear side frame 20 at the time of a rear collision can be transmitted straight from the vehicle inner side wall 20a of the rear side frame 20 to the side sill inner 14a, and generation of force acting in the direction of bending the frame is minimized. It has a frame structure that can
[0032]
After the above-described lower vehicle body structure of the vehicle is configured, a rear floor pan 51 is disposed along the upper surface of the rear side frame 20 as shown in FIG. 8, and a seat 52 and the like are attached to the upper surface of the rear floor pan 51. A cabin (not shown) is attached.
[0033]
By adopting the frame structure as described above, for example, when the vehicle is stopped by a stop signal and another vehicle collides rearward, the collision load of the rear collision is input to the left and right rear side frames 20 and 20. It is transmitted from the rear side frame 20 to the front end portion of the side sill 14 via the frame member 21 forming the rear end portion of the side sill 14, but the rear side frame 20 to the side sill 14 is formed in a continuous frame structure. Since the force acting in the direction of bending the frame is hardly generated by the input of the collision load at the time of the rear collision, the deformation of the frame can be minimized. Accordingly, it is possible to solve the problem of hindering the safety of the occupant that the rear seat moves greatly forward of the vehicle and the cabin space is reduced.
[0034]
【The invention's effect】
According to the first aspect of the invention, the bulging portion of the side sill inner is connected to the front end of the rear side frame so as to form a frame structure in which the side sill inner and the rear side frame are continuous in the front-rear direction. The impact load at the time of rear collision is transmitted straight from the rear side frame to the side sill, which can minimize the generation of force acting in the direction of bending the frame, which is advantageous for preventing deformation of the rear side frame , Can ensure the safety of passengers.
[0035]
According to a second aspect of the present invention, in the lower body structure of an automobile according to the first aspect, at least the rear end portion of the bulging portion of the side sill inner is formed by a frame member different from the front side portion of the side sill inner. Since the frame member is formed and connected to the rear side frame, the side sill inner and the rear side frame are continuous in the front-rear direction even when the rear side frame is displaced inward of the vehicle body relative to the front side portion of the side sill. By forming the frame structure so as to form a frame structure, both can be easily connected. Furthermore, the collision load at the time of rear collision of the vehicle is transmitted straight from the rear side frame to the side sill, so that the generation of force acting in the direction of bending the frame can be minimized, which is advantageous in preventing deformation of the rear side frame. At the same time, the safety of passengers can be ensured.
[0036]
In addition, since the frame members forming the rear end portions of the left and right side sill bulges are connected by a cross member, the frame member and the rear side frame are deformed by the impact load at the time of rear-end collision between the frame member and the rear side frame. The frame structure is advantageous in preventing the starting point and is strong against the impact load of the side collision.
[0037]
According to the invention of claim 3, in the lower body structure of an automobile according to claim 1 or 2, each of the left and right front side frames and the bulging portion of the side sill inner disposed on the outside thereof are provided. Since it is connected by the second cross member, the frame structure is strong against the impact load of the side collision, and the impact load at the time of the rear collision can be dispersed from the side sill to the front side frame side. This is advantageous in minimizing deformation.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an appearance of an automobile according to an embodiment.
FIG. 2 is a plan view showing a lower body structure of the automobile according to the present embodiment.
3 is a cross-sectional view taken along the line AA in FIG. 2;
FIG. 4 is an exploded perspective view showing a frame structure on the right side of the automobile according to the present embodiment.
5 is a cross-sectional view taken along the line BB in FIG. 2;
FIG. 6 is an exploded perspective view showing attachment of an intermediate cross member according to the present embodiment.
7 is a cross-sectional view taken along the line CC in FIG. 2;
FIG. 8 is a side view showing the lower body structure of the automobile according to the present embodiment.
FIG. 9 is a plan cross-sectional view showing the right-side frame structure of the automobile according to the present embodiment.
10 is a cross-sectional view taken along the arrow D-D in FIG. 9;
FIG. 11 is a plan view showing the structure of a conventional rear frame.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Car 12 Slide door 13 Roof side rail 14 Side sill 14a Side sill inner 14b Side sill outer 15 Slide door rail 20 Rear side frame 20a Car interior side wall 20b Car outer wall 21 Frame member 21a Frame member inner 21b Top plate 21c Frame member outer 21d Reinforcement rib 21e Reinforcement plate 22 Front side frame 26 Rear cross member 27 Intermediate cross member 27a Member reinforcement 28 Side sill member 29 Front cross member 30 Opening 31 Bracket 34 Reinforcement member 35 Gusset 40 Center pillar 41 Pillar outer 42 Pillar inner 43 Reinforcement plate 50 Front floor pan 51 Rear Floor pan 52 sheet

Claims (3)

A lower body structure of an automobile provided with rear side frames extending forward from the rear end of the floor and connected to left and right side sills on the left and right under the floor of the rear of the automobile,
The side sill includes a side sill outer and a side sill inner,
The side sill is formed with a recess extending in the front-rear direction of the vehicle body that is opened on the outer surface of the side sill outer, and a rail for a sliding door is disposed in the recess, and the rail has a front portion that is a vehicle body with respect to the rear portion. Is displaced inside,
In the side sill inner, a portion of the rail with respect to the front portion displaced toward the inside of the vehicle body bulges inside the vehicle body from the front side of the side sill inner, and the bulging portion extends to the rear end of the side sill inner.
A lower body structure of an automobile, wherein the bulging portion of the side sill inner is connected to the front end of the rear side frame so as to form a frame structure in which the side sill inner and the rear side frame are continuous in the front-rear direction. In the lower body structure of an automobile according to claim 1,
The rear side frame is displaced inward of the vehicle body with respect to the front side portion of the side sill,
In the side sill inner, at least the rear end portion of the bulging portion is formed by a frame member different from the front side portion of the side sill inner, and the frame member is connected to the rear side frame,
A lower body structure of an automobile, wherein frame members forming rear end portions of the bulging portions of the left and right side sills are connected by a cross member. In the lower body structure of an automobile according to claim 1 or 2,
Front side frames extending in the front-rear direction are provided on the left and right under the floor of the front of the car,
The front side frame has a rear end extending to a position where the inside of the side sill inner overlaps the bulging portion,
A lower body structure of an automobile, wherein each of the left and right front side frames and the bulging portion disposed outside thereof are connected by a second cross member.

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