JPH10129533A - Rear body structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To try to make the enhancement of stiffness for a rear body structure compatible with the enhancement of energy absorbing properties at the time of rear end collision of a vehicle. SOLUTION: In the rear body structure, since a reinforcing member 9 is joined so as to be obliquely disposed across the corner part where a rear cross member 7 and a rear side member 1 are combined with each other at the rear side of the rear cross member 7 at its side, not only the twisting stiffness of the rear body is enhanced, but also collision load at the time of rear end collision of a vehicle can be distributed to the rear side member 1 as a floor skeleton member, a rear cross member 5 and a rear wheel house so as to be burdened. This constitution thereby enables a body protection area in front of a place where the reinforcing member 9 is disposed and a body crushable and deformable area in the rear of a place where the reinforcing member 9 is disposed to be clearly dividing, therefore the stiffness of the rear body can be enhanced, and the amount and direction of crush can thereby be easily analyzed, so that collision energy absorbing properties can thereby be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body rear structure, and more particularly to a structure around a rear floor.

[0002]

2. Description of the Related Art As a conventional structure around a rear floor,
For example, as disclosed in Japanese Patent Application Laid-Open No. 6-99739, an impact bar is known that is disposed on the side of a vehicle in the front-rear direction.

[0003]

In the above conventional structure,
Since the impact bar is provided on the side of the vehicle, the rigidity of the rear portion of the vehicle body can be increased. However, the impact bar becomes a strut when a rear collision of the vehicle occurs, and crush deformation of the rear portion of the vehicle body is suppressed.

[0004] Therefore, the present invention is to improve the rigidity of the rear part of the vehicle body,
An object of the present invention is to provide a vehicle body rear structure capable of achieving both improvement in collision energy absorption characteristics at the time of a rear collision of the vehicle.

[0005]

According to a first aspect of the present invention, a rear side member constituting a front-rear skeletal member of a rear floor side portion is formed to be curved toward a vehicle center side along a side surface of a rear wheel house inner. And a rear cross member constituting a frame member in the vehicle width direction of the rear floor is connected to the rear side member at a right angle to the rear side member at the rear wheel house inner portion. On the side, a reinforcing member is jointed and arranged so as to straddle the rear cross member and the rear side member so as to straddle a corner portion where the rear cross member and the rear side member are joined.

According to a second aspect of the present invention, a support point of a link member of a rear suspension is set on the reinforcing member according to the first aspect.

According to a third aspect, the upper opening of the strut housing formed in the rear wheel house inner according to the first and second aspects is closed to connect and support the upper end of the shock absorber of the rear suspension. An upper wall connecting the upper end of the shock absorber, an upper wall formed along the periphery of the upper wall, and a front, rear, and vehicle center side jointed to the periphery of the upper opening of the strut housing. A side wall and a side wall on the vehicle body side that is joined to the rear pillar inner are formed in a box shape, and an extended portion that extends downward to the side wall on the vehicle body side and is joined to the rear pillar inner is formed. I have.

According to a fourth aspect, the reinforcing member according to the first to third aspects includes a curved portion of the rear side member along the side surface of the rear wheel house inner and a straight portion extending rearward from the curved portion. It is characterized by being joined to the continuous part.

According to a fifth aspect of the present invention, the rear side member according to the first to fourth aspects is provided with a front portion having a substantially hat-shaped cross section and having a curved portion that joins along a side surface of the rear wheel house inner; A rear portion having a substantially inverted hat-shaped cross-section, which is fitted to and coupled to the rear end of the curved portion of the front portion, extends straight rearward, and is joined to the lower surface of the rear floor panel. It is characterized in that a reinforcing member is joined to the joint between the front part and the rear part.

According to a sixth aspect of the present invention, the rear cross member according to the first to fifth aspects is arranged on a straight line connecting the left and right strut housings.

According to a seventh aspect, the bottom wall of the rear cross member according to any one of the first to sixth aspects is formed to be offset below the bottom wall of the rear side member, and the bottom of the end of the rear cross member is formed. A box-like shape having an opening formed between the wall and the bottom wall of the rear side member, an upper wall joined to the lower surface of the bottom wall of the rear side member, and a side wall joined to the edge of the rear cross member. And the opening is closed, and a spring mounted between the link member of the rear suspension and the vehicle body is housed in the spring seat.

[0012]

According to the first aspect of the present invention, the rear side of the side portion of the rear cross member is straddled across the corner where the rear cross member and the rear side member are joined, and extends over the rear cross member and the rear side member. The reinforcing members are joined to the braces to increase the torsional rigidity at the rear of the vehicle body. In addition, the collision load can be reliably applied to the rear frame members such as the rear side member, rear cross member and rear wheel house in the event of a rear collision. The vehicle body protection area ahead of the reinforcing member disposition portion and the vehicle body collapse deformation region behind the reinforcement member disposition portion can be clearly separated. The rigidity of the vehicle body can be improved, and the amount of crushing and the direction of crushing of the rear portion of the vehicle body can be easily analyzed, so that the collision energy absorbing characteristics can be improved.

In addition, in the case of a side collision of the vehicle, the deformation of the rear side member toward the floor center can be suppressed in the vehicle body protection area due to the presence of the reinforcing member. Can be prevented.

According to the second aspect, in addition to the effect of the first aspect, since the support point of the link member of the rear suspension is set on the reinforcing member, the input from the link member of the rear suspension is applied to the reinforcing member. , The burden can be shared between the rear side member and the rear cross member, so that the suspension support rigidity can be increased and the running stability can be improved.

According to the third aspect, in addition to the effects of the first and second aspects, since the joint area between the side wall on the vehicle body side formed on the shock absorber bracket and the rear pillar inner can be increased, the support rigidity of the shock absorber can be increased. And the suspension input acting on the strut housing from the shock absorber can be directly distributed and loaded on the rear pillar inner, so that the inward falling rigidity of the strut housing can be increased.

According to the fourth aspect, in addition to the effects of the first to third aspects, in addition to the effects of the first to third aspects, the reinforcing member includes a curved portion of the rear side member along the inner side surface of the rear wheel house, and a straight portion extending rearward from the curved portion. To prevent the stress from being concentrated on the connecting portion between the curved portion and the straight portion of the rear side member at the time of a rear collision or a side collision of the vehicle, and further increase the rigidity of the rear portion of the vehicle body. Can be enhanced.

According to the fifth aspect, in addition to the effects of the first to fourth aspects, the front portion having a substantially hat-shaped cross section with a curved portion for joining the rear side member along the side surface of the rear wheel house inner. And a rear portion having a substantially inverted hat-shaped cross section that is fitted and coupled to the rear end portion of the curved portion of the front portion, extends straight rearward, and is joined to the lower surface of the rear floor panel. Since the reinforcing member is joined to the joint between the front and rear parts, the rigidity of the joint between the front and rear parts of the rear side member can be increased, and at the time of a rear collision or a side collision of the vehicle. Concentration of stress on the joint can be avoided.

According to the sixth aspect, in addition to the effects of the first to fifth aspects, the rear cross member is arranged on a straight line connecting the left and right strut housings. Since a high resistance is obtained by acting as a strut on the inward falling input line, the inward falling rigidity of the strut housing can be further increased.

According to the seventh aspect, in addition to the effects of the first to sixth aspects, the bottom wall of the rear cross member is formed so as to be offset below the bottom wall of the rear side member. The closed cross-sectional area is enlarged, the vehicle body rigidity and torsional rigidity in the vehicle width direction are increased, and the opening formed between the bottom wall at the end of the rear cross member and the bottom wall of the rear side member is formed. A box-shaped spring seat having an upper wall joined to a lower surface of a bottom wall of the rear side member and a side wall joined to an end edge of the rear cross member to close the opening, Since the spring seat accommodates a spring that is mounted between the link member of the rear suspension and the vehicle body, the spring falls down in response to an input from the link member of the rear suspension. It can be enhanced suspension performance by suppressing flexed.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a rear side member constituting a frame member in the front-rear direction on the side of the rear floor, and the rear side member 1 is formed to have a substantially hat-shaped cross section with its member opening facing the outside of the vehicle. It comprises a front portion 1A, and a rear portion 1B whose member opening is formed in a substantially inverted hat shape in cross section and is fitted to and joined to the rear end of the front portion 1A.

The front portion 1A of the rear side member 1 is curved toward the vehicle center along the side surface 2a of the rear wheel house inner 2 at the portion of the rear wheel house inner 2, and has a side edge flange 1a. The upper surface 1b is joined to the lower surface of the rear floor panel 4 while the side surface 2a of the rear wheel house inner 2 and the inner surface 3a of the body side inner 3 are joined. 1c is similarly joined to the lower surface of the rear floor panel 4.

A joint member 5 which fits and joins the front part 1A and the rear part 1B of the rear side member 1 is provided at the fitting part between the front part 1A and the rear part 1B. A reinforcing brace 6 is joined and arranged in the closed cross section of the curved portion of the front portion 1A of the rear side member 1 along the rear wheel house inner 2 while increasing the coupling rigidity with the portion 1B. The resistance to a collision input at the time of a collision is increased.

Reference numeral 7 denotes a rear cross member constituting a frame member in the vehicle width direction of the rear floor. The rear cross member 7 is formed in a substantially inverted hat shape in cross section with its member opening upward, and its upper edge flange 7a is connected to a rear floor panel. 4, and the side edge flange 7b is abutted to the side surface 1d of the rear side member 1 at the portion of the rear wheel house inner 2 so as to be orthogonal to the side wheel flange.

At the joint between the rear cross member 7 and the rear side member 1, a reinforcing brace 8 is joined and arranged within the closed cross section of the rear side member 1 to reinforce.

At the rear side of the side portion of the rear cross member 7, a reinforcing member 9 having a substantially inverted hat-shaped cross section with a member opening facing upward is connected to the rear side member 1 and the rear cross member 7. The rear side member 1 and the rear cross member 7 are joined and arranged in a brace straddling the corner.

Specifically, the reinforcing member 9 joins the upper edge flange 9a to the lower surface of the rear floor panel 4,
Connect one of the side end flanges 9b to the rear surface 7 of the rear cross member 7.
c and joined together, and the other side end flange 9b is connected to a curved portion of the rear side member 1 along the side surface 2a of the rear wheel house inner 2, and a straight portion extending rearward from the curved portion. Front part 1 of rear side member 1
A bridge-shaped support brace 10 and a pin 11 for connecting and supporting a link member of a rear suspension (not shown) are provided in the closed cross section of the reinforcing member 9 so as to abut against a joint portion between the A and the rear portion 1B. It is arranged.

Numeral 12 denotes a fuel tank, which is arranged between the rear side members 1 and 1 and below the portion where the rear cross member 7 and the reinforcing member 9 are provided in the vehicle width direction.

The rear wheel house 13, which is one of the floor frame members, includes a rear hole house inner 2, a rear wheel house outer 14, and their peripheral flanges 2.
The rear wheel inner 13 is formed by integrally joining the body side inner 3 with the outer surface 3b of the body side inner 3 and the rear wheel 3b. It is abutted and joined to the upper surface 14a of the house outer 14.

Reference numeral 16 denotes a strut housing formed upward from a lower edge at a central portion of the rear wheel house inner 2 corresponding to a portion where the rear pillar inner 15 is disposed. A rear suspension is provided at an upper opening of the strut housing 16. A shock absorber bracket 18 for connecting and supporting the upper end of the shock absorber 17 is provided.

The shock absorber bracket 18 has an upper wall 18a connecting the upper end of the shock absorber 17.
Front and rear walls 18b, 18c and a side wall 18d on the vehicle center side formed along the periphery of the upper wall 18a and joined to the periphery of the upper opening of the strut housing 16.
And a side wall 18e on the vehicle side, which is joined to a portion of the body side inner 3 where the rear pillar inner 15 is disposed, to form a box shape.
Is closed at the upper opening.

In particular, an extending portion 18f extending downward is formed on the side wall 18e on the side of the vehicle, so that the shock absorber bracket 18 is joined to the portion of the body side inner 3 where the rear pillar inner 15 is provided. The area is enlarged.

Further, a reinforcement 19 is arranged on the rear side of the portion of the rear wheel house inner 2 where the strut housing 16 is formed so as to increase the support rigidity of the shock absorber.

Here, the above-mentioned rear cross member 7, which is a frame member in the vehicle width direction, has strut housings 1 on both left and right sides.
6 are arranged on a straight line.

The bottom wall 7d of the rear cross member 7 is formed so as to be offset below the bottom wall 1e of the rear side member 1 so as to increase the closed sectional area.

Accordingly, an opening is formed between the bottom wall 1e at the end of the rear side member 1 and the bottom wall 7d of the rear cross member 7, and the bottom wall 1e of the rear side member 1 is formed in this opening. A box-shaped spring seat 20 having an upper wall 20a joined to a lower surface of the rear cross member 7 and a side wall 20b joined to a side edge flange 7b of the rear cross member 7 is joined to close the opening portion, and the spring seat is closed. 20 stores a spring 21 which is elastically mounted between a link member of a rear suspension (not shown) and the vehicle body.

According to the structure of the above embodiment, the rear cross member 7 and the rear side member 1 are connected to the rear side of the rear cross member 7 so as to straddle the corner of the rear cross member 7 and the rear side member 1. Since the reinforcing member 9 is joined to the rear side member 1 so as to be braced, the torsional rigidity of the rear portion of the vehicle body can be increased.
The rear cross member 7 and the rear wheel house 13 can be reliably dispersed and loaded, and the vehicle body protection area ahead of the reinforcing member 9 where the fuel tank 12 and the like are provided, and the reinforcing member 9 are provided. The crush deformation region behind the vehicle body can be clearly distinguished from the crush deformation region, so that the rigidity of the rear body can be improved, and the amount and direction of crushing of the rear body can be easily analyzed. Can be improved.

In the case of a side collision of the vehicle, the deformation of the rear side member 1 toward the floor center can be suppressed by the presence of the reinforcing member 9 in the vehicle body protection area. Can be prevented from being deformed.

Further, since the reinforcing member 9 is joined to a continuous portion of the curved portion of the rear side member 1 along the side surface 2a of the rear wheel house inner 2, and a straight portion extending rearward from the curved portion. At the time of a rear collision or a side collision of the vehicle, stress can be prevented from being concentrated on the connecting portion between the curved portion and the straight portion of the rear side member 1, and the reinforcing member 9 is connected to the front portion 1A and the rear portion 1B of the rear side member 1. , The rigidity of the joint between the front portion 1A and the rear portion 1B of the rear side member 1 is increased, so that stress is not concentrated on the joint at the time of a rear collision or a side collision of the vehicle. can do.

In addition, since the support brace 10 and the pin 11 of the link member of the rear suspension are arranged within the closed cross section of the reinforcing member 9 and the link member is connected to the reinforcing member 9, the link is provided. Since the input from the member can be distributed to the rear side member 1 and the rear cross member 7 via the reinforcing member 9, the suspension support rigidity can be increased and the running stability can be improved.

Further, the shock absorber bracket 18
The shock absorber bracket 18 and the rear pillar inner 15 of the body side inner 3 are formed with a downwardly extending portion 18f formed on the side wall 18e on the side of the vehicle body formed on the vehicle.
Since the joint area with the portion where the is mounted is increased, the support rigidity of the shock absorber 17 can be increased, and the suspension input acting on the strut housing 16 from the shock absorber 17 is directly distributed and burdened on the rear pillar inner 15. Accordingly, the inward falling rigidity of the strut housing 16 can be increased.

In particular, in this embodiment, since the rear cross member 7 is arranged on a straight line connecting the strut housings 16 on the left and right sides, the rear cross member 7 acts as a strut on the inward input line of the strut housing 16. Therefore, the inward falling rigidity of the strut housing 5 can be further increased.

Further, the bottom wall 7d of the rear cross member 7
Is formed offset below the bottom wall 1e of the rear side member 1, the closed cross-sectional area of the rear cross member 7 is enlarged, and the rigidity and torsional rigidity in the vehicle width direction are increased. An upper wall 20a joined to a lower surface of the bottom wall 1e of the rear side member 1 at an opening formed between a bottom wall 7d at an end of the rear cross member 7 and a bottom wall 1e of the rear side member 1; A box-shaped spring seat 20 having a side wall 20b joined to a side edge flange 7b of the rear cross member 7 is joined to close the opening, and the spring seat 20 is connected to the link member of the rear suspension and the vehicle body. Spring 21 to be mounted on
Is accommodated, it is possible to suppress the spring 21 from bending in the inward falling direction due to the input from the link member of the rear suspension, thereby improving the suspension performance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along the line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rear side member 1A Front part 1B Rear part 1e Bottom wall 2 Rear wheel house inner 2a Side 4 Rear floor panel 7 Rear cross member 7d Bottom wall 9 Reinforcement member 15 Rear pillar inner 16 Strut housing 17 Shock absorber 18 Shock absorber bracket 18a Upper wall 18b 18c Front and rear walls 18d, 18e Side wall 18f Extension portion 20 Spring seat 20a Upper wall 20b Side wall 21 Spring

Claims (7)

[Claims] 1. A rear side member constituting a front-rear skeletal member of a rear floor side portion is formed to be curved toward a vehicle center side along a side surface of a rear wheel house inner and is joined to the side surface, and a vehicle width of the rear floor is provided. In a structure in which a rear cross member constituting a directional skeleton member is coupled to a rear side member at a right angle to the rear side member at the rear wheel house inner portion,
A rear body structure of an automobile, wherein a reinforcing member is braced and joined across the rear cross member and the rear side member across a corner portion where the rear cross member and the rear side member are connected. 2. The vehicle body rear structure according to claim 1, wherein a support point of a link member of a rear suspension is set on the reinforcing member. 3. A shock absorber bracket for connecting and supporting an upper end of a shock absorber of a rear suspension by closing an upper opening of a strut housing formed in a rear wheel house inner, and connecting an upper end of the shock absorber. A wall, a side wall formed along the periphery of the upper wall and joined to the periphery of the upper opening of the strut housing, a side wall on the vehicle center side, and a side wall on the vehicle body side joined to the rear pillar inner The vehicle according to any one of claims 1 and 2, wherein an extended portion is formed on the side wall on the vehicle body side and extends downward to be joined to the rear pillar inner. Rear body structure. 4. The reinforcing member is joined to a continuous portion of a curved portion of the rear side member along the side surface of the rear wheel house inner and a straight portion extending rearward from the curved portion. The vehicle body rear structure according to any one of claims 1 to 3. 5. A side portion of a substantially hat-shaped cross section provided with a curved portion that joins the rear side member along the side surface of the rear wheel house inner, and a rear end portion of the curved portion of the front portion. And a rear portion having a substantially inverted hat-shaped cross section which is joined to the lower surface of the rear floor panel and joined to the lower surface of the rear floor panel, and a reinforcing member is joined to a joint portion between the front portion and the rear portion. The vehicle body rear structure according to any one of claims 1 to 4, wherein: 6. The vehicle body rear structure according to claim 1, wherein the rear cross member is arranged on a straight line connecting the left and right strut housings. 7. A bottom wall of the rear cross member is formed so as to be offset below a bottom wall of the rear side member, and is formed between a bottom wall at an end of the rear cross member and a bottom wall of the rear side member. A box-shaped spring seat having an upper wall joined to the lower surface of the bottom wall of the rear side member and a side wall joined to an edge of the rear cross member is joined to the opening to close the opening, The vehicle body rear structure according to any one of claims 1 to 6, wherein a spring mounted between the link member of the rear suspension and the vehicle body is accommodated in the spring seat.