JP2008062695A - Vehicle body rear structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body rear structure capable of improving load absorption balance by a side member by approximately equally inputting a load from a vehicle rear side from the upper end of the side member to the lower end thereof while lowering the lower edge of a back door opening to enlarge its opening area. <P>SOLUTION: The upper wall 11 of a reinforcement 10 is offset lower than the upper end of a rear side member 1, thereby the upper wall 2u of a tail cross member 2 positioned above the reinforcement 10 is lowered to enlarge the opening area of the door opening 5, and unloading of load is facilitated by lowering of the lower edge of the back door opening 5. Since an erected flange section 14 formed on the vehicle front end of the upper wall 11 of the reinforcement 10 is connected to the front wall 2f of the tail cross member 2, vehicle rear load is transmitted to the upper part of the rear side member 1 through the erected flange part 14, and load absorption balance by the rear side member 1 is improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rear structure of a vehicle body, and in particular, relates to a rear structure of a vehicle body in which a reinforcement is provided on the extension of the rear end of a rear side member so as to protrude rearward of the vehicle.

  A pair of left and right rear side members extending in the vehicle front-rear direction are arranged on both sides in the vehicle width direction on the rear lower surface of the floor panel, and these rear side members are joined to the rear end of the floor panel and extend in the vehicle width direction. It is connected to the front wall of the existing cross member.

  The rear side member and the cross member are each formed in a closed cross section, and a reinforcement is disposed on the extension of the rear side member inside the cross member, and the reinforcement is joined to the front wall of the cross member to rearward the vehicle. In other words, the reinforcement has a shape that protrudes continuously from the rear end of the rear side member, and the rear collision load input from the rear bumper is efficiently input in the longitudinal direction of the rear side member through the reinforcement. It is supposed to let you.

The said reinforcement is comprised including the reinforcement upper part formed in the cross-section reverse U-shape by the upper wall and the both side walls suspended from the vehicle width direction both sides of the upper wall (for example, refer patent document 1). ).
Japanese Patent Laid-Open No. 10-316051 (page 3, FIG. 1-2)

  However, in such a conventional rear structure of the vehicle body, the reinforcement is coupled so that the upper wall of the reinforcement upper portion is substantially coincident with the upper wall of the rear side member formed in the closed cross section. The upper wall of the cross member in which the force is disposed is necessarily higher than the upper wall of the rear side member.

  For this reason, it is impossible to increase the opening area of the back door opening portion where the upper wall of the cross member is the lower edge, and the lower edge of the back door opening portion becomes higher in this way, thereby loading and unloading luggage. Will become difficult.

  On the other hand, if the reinforcement is simply lowered below the upper wall of the rear side member in order to lower the lower edge of the back door opening, the rear collision load input to the reinforcement concentrates on the lower part of the rear side member. Therefore, the absorption balance of the collision load by the rear side member is deteriorated, and the shock absorption efficiency due to the collision is lowered.

  Therefore, the present invention lowers the lower edge of the back door opening to increase the opening area, and allows the load from the rear of the vehicle to be input substantially evenly from the upper end to the lower end of the rear side member to absorb the load by the rear side member. A rear structure of a vehicle capable of improving the balance is provided.

  In the present invention, a rear side member joined to the lower surface of the floor panel and extending in the vehicle front-rear direction, and a cross having a closed cross-section structure joined to the rear ends of the floor panel and the rear side member and extended in the vehicle width direction A member, and at least an upper wall and both side walls suspended from both sides of the upper wall in the vehicle width direction, disposed inside the cross member, and coupled to the front wall of the cross member on an extension of the rear side member A rear portion of the vehicle body having a reinforcement projecting rearward of the vehicle, wherein the upper wall of the reinforcement is disposed with a predetermined amount offset below the upper end position of the rear side member, The most important feature is that an upstanding flange portion that rises upward and is joined to the front wall of the cross member is formed at the vehicle front end portion of the wall.

  According to the present invention, since the upper wall of the reinforcement projecting rearward from the rear end of the rear side member is disposed below the upper end of the rear side member by a predetermined amount, the upper wall of the cross member incorporating the reinforcement is disposed. The ground clearance of the wall can be lowered, and as a result, the opening area of the back door opening where the upper wall becomes the lower edge can be increased, and the ground clearance of the lower edge of the back door opening can be lowered. Easy loading and unloading of luggage.

  Even when the upper wall of the reinforcement is lowered in this way, a standing flange portion that rises upward is formed at the vehicle front end portion of the upper wall, and the standing flange portion is joined to the front wall of the cross member. When the load input from the rear of the vehicle is transmitted to the rear side member via the reinforcement, the load can be transmitted to the upper portion of the rear side member via the standing flange portion. The load is input substantially evenly from the upper end to the lower end, so that the load absorption balance by the rear side member can be improved, and consequently the load absorption efficiency by the rear side member can be improved.

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

  1 to 3 show a first embodiment of a rear structure of a vehicle according to the present invention, FIG. 1 is a perspective view showing a skeleton structure of a right rear portion of a vehicle body, and FIG. 3 and 3 are perspective views of the reinforcement.

  The rear structure of the vehicle according to the present embodiment is applied to a rear portion of a rear side member 1 that is joined to the lower surface of the floor panel 3 and disposed on both sides in the vehicle width direction as shown in FIG. A cross member having a closed cross-sectional structure, that is, a tail cross member 2 is coupled to the rear end of the floor panel 3 and the rear end of the rear side member 1.

  The rear side member 1 is formed in a hat-shaped cross section with its upper part open, and the floor panel 3 and the rear side member 1 have a substantially rectangular shape by joining flanges 1 a provided on both sides of the upper end portion to the lower surface of the floor panel 3. The closed cross section is configured.

  As shown in FIG. 2, the tail cross member 2 has a front panel 2A formed in an inverted L-shaped section by an upper wall 2u and a front wall 2f, and a L-shaped section by a bottom wall 2b and a rear wall 2r. The formed rear panel 2B is formed into a substantially rectangular closed cross section by joining flanges 2Af and 2Bf provided on both side portions to each other.

  The tail cross member 2 is formed such that its vertical dimension h1 is longer than the vertical dimension h2 of the rear side member 1, and the front upper portion of the front wall 2f of the tail cross member 2 is joined to the rear end 1r of the rear side member 1. In addition, the height of the upper wall 2u of the tail cross member 2 and the upper end of the rear side member 1, that is, the floor panel 3, is substantially matched.

  Further, a pair of left and right back pillars 4 are erected on both ends of the tail cross member 2 in the vehicle width direction, and are connected across the tail cross member 2, the back pillar 4, and the upper ends of the pair of back pillars 4. The rear roof rail (not shown) forms a back door opening 5 having the upper wall 2u of the tail cross member 2 as a lower edge.

  The back pillar 4 is formed in a closed cross section having a substantially rectangular cross section like the tail cross member 2, but only the inner plate base portion 4A of the back pillar 4 forming the closed cross section is shown in FIGS. The inner plate, which is a general part (not shown), is integrally joined upward to the inner plate base 4A, and the outer plate is joined so as to form a closed cross section outside the inner plate. The back pillar 4 having the closed cross-sectional structure is formed.

  Inside the tail cross member 2 is provided a rain force 10 for efficiently transmitting a load from the rear of the vehicle, for example, a rear collision load, to the rear side member 1 while preventing the tail cross member 2 from being crushed.

  As shown in FIG. 3, the reinforcement 10 includes an upper wall 11 and both side walls 12 and 13 suspended from both sides of the upper wall 11 in the vehicle width direction. The vehicle front end portions 12 and 13 are bent outward in the vehicle width direction to form mounting flanges 12a and 13a, respectively, and the vehicle rear end portions of the upper wall 11 and the side walls 12 and 13 are surrounded by each. Load receiving surfaces 11a, 12b, and 13b are formed by being bent inward with a predetermined width.

  The reinforcement 10 is positioned on the extension of the rear side member 1 as shown in FIGS. 1 and 2, and the attachment flanges 12 a and 13 a are coupled to the front wall 2 f of the cross member 10. Is projected from the rear end of the rear side member 1 toward the rear of the vehicle.

  An appropriate space is provided between the load receiving surfaces 11a, 12b, 13b provided at the front end of the reinforcement 10 and the rear wall 2r of the tail cross member 2, and the rear side of the tail cross member 2 in the vehicle is The rear bumper is covered with a bumper fascia of a rear bumper (not shown), and at the time of a rear collision, the rear wall 2r of the bumper fascia and the tail cross member 2 is deformed by the input load at that time. After the contact, the load is transmitted to the rear side member 1 through the reinforcement 10.

  Here, according to the present invention, the upper wall 11 of the reinforcement 10 is offset with a predetermined amount α below the upper end of the rear side member 1, that is, below the floor panel 3. A standing flange portion 14 that rises upward and is joined to the front wall 2 f of the tail cross member 2 is formed at the vehicle front end portion of the wall 11.

  Further, in the present embodiment, a bead 20 that is continuous from the rear end of the upper wall 11 of the reinforcement 10 to the upper end of the upright flange portion 14 is provided.

  The bead 20 bulges upward on the upper wall 11 and bulges rearward of the vehicle at the standing flange portion 14.

  That is, the bead 20 bulges upward on the upper wall 11, thereby forming a groove 20 a extending in the vehicle front-rear direction on the lower surface of the upper wall 11, and bulges rearward of the vehicle at the standing flange 14. As a result, a groove portion 20b extending in the vertical direction is formed on the front surface of the upright flange portion 14, the two groove portions 20a and 20b are continuous with each other, and the upright flange portion 14 is connected to the front wall 2f of the tail cross member 2. In this state, the upper end of the groove 20b is released upward.

  In the present embodiment, the bead 20 is formed at the substantially central portion of the upper wall 11 and the upright flange 14 in the vehicle width direction.

  Further, the both side walls 12 and 13 of the reinforcement 10 are formed such that their lower sides 12c and 13c are inclined upward toward the rear of the vehicle.

  That is, in the reinforcement 10, the upper wall 11 is substantially parallel to the road surface, and the side walls 12 and 13 are tapered toward the rear of the vehicle with respect to the upper wall 11.

  With the above configuration, according to the rear structure of the vehicle body of the present embodiment, the reinforcement 10 provided inside the tail cross member 2 having a closed cross-sectional structure is disposed on the extension of the rear side member 1. Can be transmitted to the rear side member 1 efficiently.

  At this time, since the upper wall 11 of the reinforcement 10 is arranged with a predetermined amount α offset below the floor panel 3 that is the upper end of the rear side member 1, the tail cross member 2 positioned above the reinforcement 10 is disposed. The ground clearance of the upper wall 2u can be lowered.

  Therefore, in the present embodiment, the upper wall 2u is made substantially equal in height to the floor panel 3 which is the upper end of the rear side member 1, and the opening area of the back door opening 5 where the upper wall 2u is the lower edge is increased. And lowering the lower edge of the back door opening 5 facilitates loading and unloading of luggage.

  Even when the upper wall 11 of the reinforcement 10 is lowered as described above, the upright flange portion 14 formed at the vehicle front end portion of the upper wall 11 is joined to the front wall 2 f of the tail cross member 2. When the load input from the rear side member 1 is transmitted to the rear side member 1 through the reinforcement 10, the load can be transmitted to the upper portion of the rear side member 1 through the standing flange portion 14. 1, the load is input substantially evenly from the upper end to the lower end, so that the load absorption balance by the rear side member 1 can be improved. As a result, the load absorption efficiency by the rear side member 1 can be improved.

  Further, in the present embodiment, the bead 20 that is continuous from the rear end of the upper wall 11 of the reinforcement 10 to the upper end of the standing flange portion 14 is provided, so that the rigidity from the upper wall 11 of the reinforcement 10 to the standing flange portion 14 is provided. Therefore, the transmission of the rear collision load to the upper part of the rear side member 1 is good.

  Further, the bead 20 bulges upward on the upper wall 11, and bulges rearward of the vehicle on the standing flange portion 14, so that the groove 20 a and the standing flange portion 14 formed on the lower surface of the upper wall 11. Since the groove portion 20b formed on the front surface of the body is continuous, air accumulated in the upper portion of the reinforcement 10 having a substantially inverted U-shaped cross section when the vehicle body is electrodeposited is guided by the groove portions 20a and 20b. However, since it can discharge | emit outward from the upper end of the groove part 20b of the standing flange part 20a, the electrodeposition coating can be favorably performed by using the bead 20 as an air bleeding guide.

  Furthermore, since the lower sides 12c and 13c of the both side walls 12 and 13 of the reinforcement 10 are inclined upward toward the rear of the vehicle, buckling of the reinforcement 10 is suppressed and the rear collision load is stabilized. Can be transmitted to the rear side member 1 at the same time, and the transmission part of the rear collision load to the rear side member 1 can be efficiently placed at a high position, so that it is possible to prevent the load from being concentrated and input to the lower portion of the rear side member 1. .

  FIG. 4 shows a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. 4 is a sectional view corresponding to FIG. It is.

  The rear structure of the vehicle body of this embodiment is basically the same as that of the first embodiment. As shown in FIG. 4, the reinforcement 10 is disposed in the tail cross member 2 to extend the rear side member 1. Are connected to the front wall 2f of the tail cross member 2 and the upper wall 11 of the reinforcement 10 is offset by a predetermined amount α (see FIG. 2) below the floor panel 3 serving as the upper end of the rear side member 1. Further, the height of the upper wall 2u of the tail cross member 2 and the floor panel 3 which is the upper end of the rear side member 1 are substantially matched.

  Of course, even in the present embodiment, the standing flange portion 14 is formed at the vehicle front end portion of the upper wall 11 of the reinforcement 10, and the standing flange portion 14 is joined to the front wall 2 f of the tail cross member 2. .

  In this embodiment, the upper wall 2u of the tail cross member 2 is formed by lowering the vehicle rear side downward.

  That is, the upper wall 2u of the tail cross member 2 has a vehicle front end 2uf that is substantially the same height as the floor panel 3 that is the upper end of the rear side member 1, and moves rearward from the front end 2uf by a predetermined distance L. An inclined surface 2S that is gradually inclined downward from the point P toward the rear of the vehicle is formed.

  Although the case where the inclined surface 2S is inclined linearly is illustrated, the present invention is not limited to this, and the inclined surface 2S may be inclined in a shape such as a stepped shape in which the vehicle rear side of the upper wall 2u is entirely pushed down.

  Therefore, according to the rear structure of the vehicle body of the present embodiment, the vehicle rear of the upper wall 2u of the rear cross member 2 serving as the lower edge of the back door opening 5 is lowered downward, so that the back door opening 5 The opening area of the entrance portion of the bag can be increased, and the loading and unloading of the load becomes easier.

  By the way, the rear structure of the vehicle body of the present invention has been described by taking the first and second embodiments as examples. However, the present invention is not limited to these embodiments, and various other embodiments are adopted without departing from the gist of the present invention. For example, the reinforcement 10 includes an upper wall 11 and both side walls 12 and 13 and is formed in a substantially inverted U shape in cross section, but covers the lower sides of both side walls 12 and 13 integrally or separately, The present invention can also be applied when the reinforcement 10 is formed as a closed cross section.

The perspective view which shows the frame | skeleton structure of the vehicle body right side rear part in 1st Embodiment of this invention. Sectional drawing along the AA line in FIG. The perspective view of the reinforcement in 1st Embodiment of this invention. Sectional drawing corresponding to FIG.

Explanation of symbols

1 Rear side member 2 Tail cross member (cross member)
2u Upper wall of cross member 2f Front wall of cross member 10 Reinforce 11 Reinforce upper wall 12, 13 Reinforce side wall 14 Standing flange 20 Bead

Claims (5)

A rear side member joined to the lower surface of the floor panel and extending in the vehicle longitudinal direction;
A cross member having a closed cross-sectional structure coupled to the rear ends of the floor panel and the rear side member and extending in the vehicle width direction;
At least an upper wall and both side walls hanging from both sides of the upper wall in the vehicle width direction, disposed inside the cross member, and coupled to the front wall of the cross member on the extension of the rear side member, In the rear structure of the vehicle body, which has
The upper wall of the reinforcement is disposed offset by a predetermined amount below the position of the upper end of the rear side member, and rises upward at the vehicle front end of the upper wall of the rear force to the front wall of the cross member. A rear structure of a vehicle body, wherein a standing flange portion to be joined is formed.   The rear structure of the vehicle body according to claim 1, wherein a bead is provided continuously from the rear end of the upper wall of the reinforcement to the upper end of the standing flange portion.   The rear structure of the vehicle body according to claim 2, wherein the bead is bulged upward at the upper wall and bulged rearward of the vehicle at the standing flange portion.   The rear part structure of the vehicle body according to any one of claims 1 to 3, wherein both side walls of the reinforcement are formed such that their lower sides are inclined upward toward the rear of the vehicle.   The rear part structure of a vehicle body according to any one of claims 1 to 4, wherein the upper wall of the cross member is formed by lowering the rear of the vehicle downward.

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