JP5815366B2 - Rear body structure of automobile - Google Patents

Description

  The present invention includes a left and right pillar member, a quarter member extending rearward from the left and right pillar members, and a lower back member disposed between rear ends of the left and right quarter members. The present invention relates to a rear body structure of an automobile.

  For example, an open car employs a structure that increases the torsional rigidity of the vehicle body against a thrust load from the road surface because there is no roof. For example, in Patent Document 1, a lower back member 60 is coupled to the rear end surfaces of quarter members 70, 56 and 64, 58 extending rearward from left and right pillar members (not indicated), and the left and right quarter members and the left , A structure in which the right rocker members 72 and 66 are connected by strut towers 50 and 52 is disclosed.

Japanese translation of PCT publication No. 2002-522291

  By the way, when the structure is such that the rear end surfaces of the left and right quarter members are butted against the front wall surface of the lower back member as in the conventional structure, the connection between the rigid portions is interrupted. For this reason, there is a concern that the connecting portion becomes a breaking point with respect to the thrust load from the strut tower, and the entire rear frame is easily twisted and deformed. In order to make up for such a lack of rigidity of the connecting portion, it is necessary to newly add a reinforcing member, which causes a problem that the weight and cost of the vehicle body increase.

  The present invention has been made in view of the above-described conventional situation, and it is an object of the present invention to provide a rear vehicle body structure that can increase torsional rigidity against a thrust load without causing an increase in vehicle body weight and cost. .

The invention of claim 1 is provided on the outer side in the vehicle width direction, and extends left and right pillar members extending in the vehicle vertical direction,
Left and right quarter members arranged to extend rearward from the left and right pillar members;
A lower back member disposed at the rear end of the left and right quarter members so as to extend in the vehicle width direction;
An open car rear vehicle body structure including a strut tower disposed between the lower back member and the left and right quarter members and supporting a shock absorber connected to a rear wheel;
The left and right quarter members and the lower back member are integrally coupled through a continuous member, and the quarter member, the lower back member and the continuous member have a substantially cylindrical closed cross section, and the closed cross section The upper part 13a of the strut tower is coupled to the continuous member, the lower back member is composed of a lower back inner and a lower back outer, and the closed cross section of the lower back member is The lower back outer is coupled to the upper portion of the lower back inner, and the rear portions of the left and right rear side members extending in the vehicle front-rear direction are coupled to the lower portion of the lower back inner. A portion of the back inner where the rear end portion of the rear side member is coupled, and a portion constituting the closed cross-sectional portion of the lower back outer, It is characterized by being connected so as to bridge in the vertical direction by one reinforcing member .

According to a second aspect of the present invention, in the rear vehicle body structure of the open car according to the first aspect, a convex portion projecting rearward of the vehicle is formed at a lower portion of the lower back inner, and the left and right side portions of the convex portion are formed. The rear end portions of the left and right rear side members that extend in the vehicle front-rear direction are joined, and the convex portion of the lower back inner and the rear end portion of the rear side member are joined by a second reinforcing member. The second reinforcing member is formed in a box shape so as to be bridged in the width direction, and has substantially the same height in the vehicle front-rear direction as the rear end surface of the convex portion.

  According to the rear vehicle body structure of the first aspect of the present invention, the left and right quarter members and the lower back member are integrally coupled so that the substantially cylindrical closed cross section is continuous, The upper wall surface of the strut tower is connected to the corner portion with the lower back member.

  Since it is configured in this manner, the frame structure has a continuous closed cross section that does not break from the left and right quarter members to the lower back member and the front end of the quarter member is coupled to the pillar member. Can do. As a result, it is possible to eliminate a break point with respect to the thrust load from the strut tower applied to the corner portion, the thrust load can be received by the entire rear vehicle body, and torsional deformation can be suppressed. That is, the left and right quarter members and the lower back member function as a stabilizer, so that the torsional deformation of the rear vehicle body due to the thrust load can be suppressed.

  As described above, in the first aspect of the present invention, the structure in which the left and right quarter members and the lower back member are integrally coupled so that the closed cross-section portion is continuous is employed, so that a new reinforcing member is not added. The torsional rigidity can be increased, the increase in the weight and cost of the vehicle body can be suppressed, and the weight and cost can be reduced.

Further, since the portion where the rear end portion of the rear side member of the lower back inner is joined and the closed cross-section portion of the lower back outer are joined so as to be bridged in the vertical direction by the first reinforcing member, the vertical direction from the rear side member, An input in the front-rear direction can be efficiently transmitted to the closed cross section of the lower back member having high rigidity via the first reinforcing member. As a result, the displacement difference generated between the left and right rear side members can be suppressed, and the torsional deformation of the rear vehicle body can be effectively suppressed.

  Also, the thrust load from the shock absorber can be efficiently transmitted to the closed cross section of the lower back member via the first reinforcing member, and the displacement difference between the left and right strut towers that support the shock absorber is effective. Can be suppressed.

  Furthermore, since the rear side member and the lower back member are connected in the vertical direction by the first reinforcing member, for example, compared to a structure in which the left and right rear side members are connected by a box-shaped member having a closed cross-sectional structure extending in the vehicle width direction. Further, the cost and the weight of the vehicle body can be reduced, and the lower back member can be prevented from being deformed back and forth and falling down due to input in the front-rear direction from the rear side member.

In the invention of claim 2 , since the convex portion formed so as to protrude rearward of the vehicle and the rear side member coupling portion of the lower back inner are coupled by the second reinforcing member so as to be bridged in the vehicle width direction, the convex portion And the deformation | transformation of a vehicle body rear part can be suppressed effectively.

  That is, when a convex part protruding rearward of the vehicle is formed in a lower part of the lower back inner, the ridge line of the convex part is easily broken and a deformation is likely to occur. Since the portion and the rear side member joining portion are bridged and joined without any break, deformation of the convex portion can be suppressed. Further, the convex portion and the second reinforcing member also have a function of bridging and joining the left and right side members, and from this point, deformation of the rear portion of the vehicle body can be more reliably suppressed.

  Here, when the left and right side members are bridged, if a long reinforcing member corresponding to the vehicle width is adopted, there will be problems of weight increase and cost increase. In the present invention, however, the lower back inner is formed. Since the left and right side members are bridged by interposing the raised convex portions, the necessary length of the reinforcing member can be shortened accordingly, and the problems of weight increase and cost increase can be suppressed.

1 is a perspective view of a vehicle body of an automobile according to Embodiment 1 of the present invention. It is a perspective view of the rear vehicle body of the automobile. FIG. 3 is a cross-sectional plan view of the rear vehicle body. It is the perspective view seen from the outer side of the said rear vehicle body. FIG. 5 is a cross-sectional view of the rear vehicle body (a cross-sectional view taken along line VV in FIG. 3). FIG. 5 is a cross-sectional view of the center pillar of the rear vehicle body (a cross-sectional view taken along line VI-VI in FIG. 4). FIG. 7 is a sectional plan view of the quarter member of the rear vehicle body (sectional view taken along line VII-VII in FIG. 4). FIG. 5 is a sectional view of the quarter member (a sectional view taken along line VIII-VIII in FIG. 4). It is a perspective view for demonstrating the rear vehicle body by Example 2 of this invention. It is the perspective view seen from the back of the lower back panel of the said rear body. It is sectional drawing (XI-XI sectional view taken on the line of FIG. 10) of the said lower back panel. It is a perspective view for demonstrating the rear vehicle body by Example 3 of this invention. It is the perspective view which looked at the reinforcement member of the said rear vehicle body from diagonally back. It is a perspective view for demonstrating the rear vehicle body by Example 4 of this invention. It is the perspective view which looked at the reinforcement member of the said rear vehicle body from diagonally back.

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

  1 to 8 are views for explaining a rear body structure of an automobile according to a first embodiment of the present invention. In the description of this embodiment, the terms front and rear and left and right mean front and rear and left and right when viewed in the vehicle forward direction while seated on the seat.

  In the figure, reference numeral 1 denotes a rear body of the open car. The rear vehicle body 1 includes left and right side panels 4 and 4 which are formed by connecting a side outer panel 2 and a side inner panel 3 which are exterior parts disposed on the left and right outer sides in the vehicle width direction so as to form a hollow shape. And a rocker extending in the front-rear direction, which is disposed at the lower ends of the left and right side panels 4 and is integrally coupled with the lower part 3a of the side inner panel 3 interposed between the rocker outer 5a and the rocker inner 5b. Panels 5 and 5 and a rear floor panel 6 connected to the left and right rocker panels 5 are joined. A front floor panel 9 on which a seat (not shown) is mounted is disposed on the front side of the left and right rocker panels 5 (see FIG. 1).

  Left and right rear side members 7 and 7 extending in the front-rear direction are coupled to the left and right edge portions of the lower surface of the rear floor panel 6, and the left and right rear side members 7 extend in the vehicle width direction. The rear cross member 8 is coupled.

  The rear vehicle body 1 is disposed at the front part of the left and right side panels 4, and the left and right center pillars 10, 10 extending in the vehicle vertical direction with lower ends thereof coupled to the rocker panel 5, The quarter members 11, 11 arranged to extend rearward from the upper ends of the left and right center pillars 10 and the vehicle members extending in the vehicle width direction arranged between the rear ends of the left and right quarter members 11. A lower back panel 12 and a strut tower 13 disposed between the lower back panel 12 and the left and right quarter members 11 are provided.

  The left and right strut towers 13 are formed at the rear ends of wheel houses 14 and 14 disposed so as to cover the upper portion of a rear wheel (not shown), and a shock absorber 15 connected to the rear wheel. Is fixed (see FIG. 5).

  A luggage room opening 1a is formed by the upper edges of the left and right quarter members 11 and the lower back panel 12, and a luggage door 18 is disposed in the luggage room opening 1a so as to be openable and closable.

  Lower end portions of front pillars 19 and 19 extending in the vertical direction are coupled to the front end portions of the left and right rocker panels 5. A door opening 1 b is formed by the front pillar 19, the rocker panel 5 and the center pillar 10. In the door opening 1b, a door (not shown) rotatably supported by the front pillar 19 is disposed.

  Between the left and right center pillars 10, a roll bar device 20 is disposed to increase the rigidity of the vehicle body against a load at the time of a fall or a side collision.

  The roll bar device 20 includes an upper cross bar 22 to which a pair of left and right roll bars 21 and 21 are coupled, a lower cross bar 23 that is offset from the front lower side of the upper cross bar 22, and both the cross bars. Connecting bars 24 and 24 for connecting the left and right ends of the bars 22 and 23 in the vertical direction, and left and right brackets 25 and 25 in which the upper and lower crossbars 22 and 23 are coupled together with the connecting bar 24; It has.

  The left and right brackets 25 are tightened by inserting bolts 27 into the respective cylindrical collar members 26 arranged in the vehicle width direction within the closed cross section of the center pillar 10 and tightening. Is bound to.

  The left and right center pillars 10 are each provided with a pillar rein hose 30 between a front portion 3b of the side inner panel 3 and a pillar outer panel 29 disposed on the vehicle inner side of the side outer panel 2. It has a structure in which a rectangular tube-like closed section extending in the vertical direction is formed by integrally joining front and rear edges and upper edges.

  The left and right center pillars 10 have front and rear lengths extending substantially over the latter half of the rocker panel 5, whereby the overlapping portion between the center pillar 10 and the rocker panel 5 is wide in the front and rear direction.

  The left and right quarter members 11 are arranged along the upper side of the side inner panel 3 in the side panel 4 and have a generally cross-sectional hat shape that opens to the inside of the vehicle.

  The left and right quarter members 11 are connected by connecting the upper flange portion 11a to the upper flange portion 3c of the side inner panel 3 and the lower flange portion 11b to the outer wall surface of the side inner panel 3. The side inner panel 3 has a structure in which first closed cross-section portions a and a having a rectangular tube shape extending in the vehicle front-rear direction are formed.

  Further, by connecting the rear end wall 11c of each quarter member 11 to the side inner panel 3, the rear end of the first closed cross section a is closed (see FIG. 3).

  The lower back panel 12 has a structure in which a lower closed inner portion 31 and a lower back outer 32 are integrally coupled to form a second closed cross-section portion b having a rectangular tube shape extending in the vehicle width direction. The lower back inner 31 extends downward and is coupled to the rear floor panel 6.

  The front portions 11d of the left and right quarter members 11 are inserted into the closed cross section of the center pillar 10 so as to be positioned in front of the centroid of the center pillar 10, and are integrally coupled to the center pillar 10. . Thus, the left and right quarter members 11 are coupled to the center pillar 10 in a skewered manner.

  Specifically, as shown in FIG. 6, the upper flange portion 11a of the front portion 11d of each quarter member 11 includes an upper flange portion 29a of the pillar outer panel 29, an upper flange portion 30a of the pillar rein hose 30, and the side inner panel. The upper flange portion 3c is overlapped and integrally coupled. The lower flange portion 11b is fastened together with the pillar rein hose 30, the side inner panel 3, and the bracket 25 together with the bolt 27 with a collar member 26 interposed therebetween.

  The pillar outer panel 29 is formed with a plurality of recesses 29b that are in contact with the quarter member 11 at a portion facing the quarter member 11, and each recess 29b is coupled to the quarter member 11.

  The left and right quarter members 11 and the lower back panel 12 are integrally coupled so that the first and second closed cross sections a and b are continuous.

  The left and right quarter members 11 and the lower back panel 12 are joined with continuous members 35 interposed therebetween. Rear combination lamps 36 and 36 are disposed on the vehicle exterior side of the left and right continuous members 35.

  The left and right continuous members 35 form the corner portions of the left and right quarter members 11 and the lower back panel 12, and the outer member 35a and the inner member 35b are joined together to form a rectangular tube-shaped first member. It has a structure in which three closed cross sections c are formed. Thus, the first and second closed cross-sections a and b are continuous without interruption with the left and right third closed cross-sections c interposed therebetween.

  An upper wall surface of the strut tower 13 is coupled to the left and right continuous members 35. In detail, the upper side part 13a bent at the outer edge of the strut tower 13 is coupled to the inner side surface of the inner member 35b (see FIG. 5). Thus, the left and right shock absorbers 15 are supported by the quarter member 11 and the lower back panel 12 from the strut tower 13 through the continuous member 35.

  According to the present embodiment, the left and right quarter members 11 and the lower back panel 12 are provided with first and second closed cross-section portions a and b having substantially rectangular tube shapes, and the first and second closed cross-section portions. a and b are integrally coupled so as to be continuous via the third closed cross-sectional portion c of the continuous member 35, and the continuous member 35 forming the corner portions of the left and right quarter members 11 and the lower back panel 12 is formed. The upper side 13a of the strut tower 13 was joined.

  Since it comprised in this way, it has the 1st-3rd closed cross-section part a, c, b which continued from the left and right quarter members 11 to the lower back panel 12, and the front-end part is a center. A frame structure coupled to the pillar 10 in a skewered manner can be used.

  Thereby, the break point with respect to the thrust load from the strut tower 13 applied to the continuous member 35 can be eliminated, and the left and right quarter members 11 and the lower back panel 12 function as a stabilizer, and the thrust load is applied to the rear vehicle body 1. It is possible to bear the entire load, and torsional deformation of the rear vehicle body 1 can be suppressed.

  More specifically, the frame structure has the continuous closed cross section, has a substantially U shape in plan view, and has a front end portion of the quarter member 11 coupled to the center pillar 10 in a skewered manner. Since the center pillar 10 functions so as not to fall backward in the vehicle against the thrust load input to any corner portion, the corner portion on the opposite side to the input functions so as not to be deformed inside the vehicle. The torsional deformation of the corner portion is suppressed by the reaction force opposite to the thrust load. Further, a side inner panel extending downward is connected to the quarter member 11, and since the lower back panel 12 has a lower back outer extending downward, these function as a shear panel and are twisted. Deformation can be suppressed more reliably.

  As described above, the present embodiment employs a structure in which the left and right quarter members 11 and the lower back panel 12 are integrally coupled via the continuous member 35 so that the closed cross-sections a, b, and c are continuous. Therefore, the required frame structure can be realized by effectively using the existing body member, and the torsional rigidity can be increased without adding a new reinforcing member. As a result, it is possible to suppress an increase in the weight and cost of the vehicle body, and thus it is possible to achieve weight reduction and cost reduction.

  In this embodiment, since the front portions 11d of the left and right quarter members 11 are inserted into the closed cross section of the center pillar 10 and coupled to the center pillar 10 in a skewered manner, the thrust load from the strut tower 13 is It can be received by the center pillar 10 via the right quarter member 11, and the torsional rigidity can be further increased. In this case, the input to the center pillar 10 can be distributed and transmitted to the front pillar 19 and the upper member 38 via the rocker panel 5, and the load on the rear vehicle body 1 can be reduced.

  In addition, since the left and right center pillars 10 are coupled by the roll bar device 20, the entire rear vehicle body 1 can be annularly enclosed in a plan view, and the force to be twisted and deformed can be generated by the entire annular skeleton member. Therefore, the torsional rigidity in the open car can be further increased.

  9 to 11 are views for explaining the rear vehicle body structure according to the second embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 8 denote the same or corresponding parts. The second embodiment is an example in which the lower back panel 12 at the rear of the vehicle body is reinforced by the first reinforcing member in the first embodiment.

  The lower back panel 12 includes the lower back inner 31 and the lower back outer 32, and the second closed cross-section portion b of the lower back panel 12 is disposed on the lower portion 31 c of the lower back inner 31. It is formed by connecting the outer 32.

  More specifically, the upper flange portions 31a and 32a and the lower flange portions 31b and 32b of the lower back inner 31 and the lower back outer 32 having a hat-shaped cross section are joined by spot welding to form a second rectangular tube-shaped second closure. It has a structure in which a cross section b is formed.

  The lower back inner 31 includes an upper portion 31c having the hat shape in cross section and a lower portion 31d extending downward following the lower flange portion 31b of the upper portion 31c. An inclined portion 31d 'extending obliquely rearward and downward from the lower flange portion 31b is formed at the upper portion of the lower portion 31d.

  A convex portion 31e is formed so as to protrude rearward at the vehicle width direction central portion of the lower portion 31d of the lower back inner 31. The convex portion 31e constitutes a rear end portion of the spare tire storage concave portion 6a provided in the rear floor panel 6. Further, on the left and right side portions of the lower portion 31d of the lower back inner 31, there are rear end flange portions 7a that are bent outwardly from the rear edges of the left and right rear side members 7 extending in the vehicle front-rear direction. Are combined.

  The left and right rear side members 7 have a hat shape that opens upward, and the rear floor panel 6 is coupled to the upper surface of the rear side member 7, thereby forming a closed cross section d.

  The lower side 13b of the strut tower 13 is coupled to the outer surfaces of the left and right rear side members 7, and the upper side 13a of the strut tower 13 is connected to the lower flange 31b of the lower back inner 31 and the lower flange 32b. In addition, three sheets are overlapped and joined by spot welding.

  The portion of the lower back inner 31 to which the rear end flange portion 7a of the left and right rear side members 7 is coupled and the portion desired for the closed cross-section portion b of the lower back outer 32 are a first reinforcing member. 40 is connected by bridging in the vertical direction.

  The first reinforcing member 40 includes a vertical wall portion 40a extending in the vertical direction, left and right wall portions 40b and 40b extending forward and bent from the left and right edges of the vertical wall portion 40a, and the vertical wall portion 40a. And a lower wall portion 40c that bends and extends forward from the lower edge. Thus, since the 1st reinforcement member 40 was made into the substantially box-shaped thing, the rigidity of this 1st reinforcement member single-piece | unit is high.

  An upper flange portion 40f is formed on the upper edge of the vertical wall portion 40a so as to protrude upward, and a lower flange portion 40g is bent downward on the front edge of the lower wall portion 40c.

  Further, outer and inner flange portions 40h and 40i are bent at the vehicle outer side and vehicle inner side at the front edge of the left and right side wall portions 40b, and a horizontal flange portion 40j is bent at the upper edge and bent at the vehicle outer side. Yes.

  The upper flange portion 40f is coupled to the vertical wall 32c forming the closed cross-section portion b of the lower back outer 32 by spot welding in the front-rear direction.

  The lower flange portion 40g and the outer and inner flange portions 40h and 40i are joined to the lower portion 31d of the lower back inner 31 together with the rear end flange portion 7a of the rear side member 7 by spot welding in the front-rear direction. .

  The upper portion 40h 'of the outer flange portion 40h is overlapped with the inclined portion 31d' of the lower portion 31d together with the inclined portion 13c of the strut tower 13 by spot welding in an obliquely downward direction.

  The lateral flange portion 40j is coupled to the lower wall 32d forming the closed cross-sectional portion b of the lower back outer 32 by spot welding in the vertical direction.

  In this way, the first reinforcing member 40 and the lower back panel 12 form a rectangular tube-shaped closed section e, and the closed section b of the lower back panel 2 and the rear side are formed via the closed section e. The closed cross section d of the member 7 is connected.

  Thus, the vertical input from the rear side member 7 is received in the shearing direction by the outer and inner flange portions 40h and 40i and the lower flange portion 40g, and is transmitted to the lower back outer 32 via the upper flange portion 40f in the shearing direction. The Further, the input in the front-rear direction from the rear side member 7 is transmitted in the shearing direction to the lower back outer 32 through the lateral flange portion 40j. Further, the vertical input from the strut tower 13 is received in the shearing direction by the upper portion 40h ′ of the outer flange portion 40h, and is transmitted to the lower back outer 32 through the upper flange portion 40f in the shearing direction.

  As described above, since the flange portions 40f to 40j are spot-welded so as to be directed in different directions, the vertical and longitudinal inputs from the rear side member 7 and the strut tower 13 are received in the shear direction, and the lower back panel. It can be transmitted to the 12 closed cross-sections b in the shear direction.

  According to this embodiment, the connecting portion of the rear end flange portion 7 a of the rear side member 7 of the lower back inner 31 and the portion desired for the closed cross-section portion b of the lower back outer 32 are connected in the vertical direction by the first reinforcing member 40. Therefore, the input in the vertical direction and the front-rear direction from the rear side member 7 can be efficiently transmitted to the closed section b of the lower back panel 12 having high rigidity via the first reinforcing member 40. Thereby, the displacement difference produced between the left and right rear side members 7 can be suppressed, and the torsional deformation of the rear vehicle body 1 can be effectively suppressed.

  Further, the thrust load from the shock absorber 15 can be efficiently transmitted to the closed cross section b of the lower back panel 12 through the first reinforcing member 40, and the left and right strut towers 13 that support the shock absorber 15 are supported. The displacement difference between them can be effectively suppressed, and the torsional deformation of the rear vehicle body 1 can also be suppressed from this point.

  Here, it is conceivable to suppress the torsional deformation by connecting the rear end portions of the left and right rear side members with a box-shaped member extending in the vehicle width direction. However, if this is done, the large-sized reinforcement causes a problem that the weight and cost of the vehicle body increase, and the front and rear direction input from the rear side member causes the closed cross section of the lower back outer and the box member to There is a possibility that the lower back member may be deformed so as to fall back and forth as a break occurs.

  On the other hand, in the present embodiment, the rear side member 7 and the lower back panel 12 are coupled by the first reinforcing member 40 so as to be bridged in the vertical direction, so that the left and right rear side members extend in the vehicle width direction. Compared with the above-described structure that is connected by a member, the cost and the weight of the vehicle body can be reduced, and it is possible to prevent the lower back panel 12 from being deformed back and forth due to input in the front-rear direction from the rear side member 7 and falling down. .

  12 and 13 are views for explaining a rear vehicle body structure according to a third embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 11 denote the same or corresponding parts. The third embodiment is an example in which the lower back panel 12 at the rear of the vehicle body is reinforced by the second reinforcing member in the first embodiment.

  A convex portion 31e constituting the rear end portion of the spare tire housing concave portion 6a is formed at a substantially central portion in the vehicle width direction of the lower portion 31d of the lower back inner 31 constituting the lower back panel 12. The convex portion 31e protrudes rearward of the vehicle so as to form a substantially trapezoidal shape in plan view, and the position of the rear end surface 31f in the vehicle front-rear direction is set to be substantially the same as the vertical wall 32c of the lower back outer 32.

  The lower back inner 31 is connected to the portion where the convex portion 31e and the rear end portion of the rear side members 7 and 7 are connected to be bridged by the second reinforcing members 41 and 41 in the vehicle width direction. .

  The second reinforcing member 41 has a cross-sectional hat shape having a rear wall 41a, an upper wall, a lower wall 41b, and a side wall 41c, and upper and lower flange portions 41d and 41d, a side flange portion 41e, an inclined portion on the periphery thereof. A flange portion 41f is formed.

  A vehicle width direction inner end portion 41g of the rear wall 41a of the second reinforcing member 41 is joined to the rear end surface 31f of the convex portion 31e by spot welding. The rear wall 41a and the rear end surface 31f are set to substantially the same height in the vehicle front-rear direction.

  The inclined flange portion 41f is joined to the side surface 31g of the convex portion 31e by spot welding, and the upper and lower flange portions 41d and 41d and the side flange portion 41e are connected to a lower portion 31d of the lower back inner 31. The left and right rear side members 7 and 7 are sandwiched and joined to the flange portion 7a by spot welding of three sheets. Thus, the second reinforcing member 41 has a box shape closed by the lower portion 31d of the lower back inner 31 and the convex portion 31e.

  In the compact vehicle targeted by the present embodiment, the lower portion 31d of the lower back panel 12 may be formed with a convex portion 31e constituting a part of the spare tire storage concave portion 6a. Since the upper part 31c of the lower back panel 12 has a closed cross-sectional structure, it is easy to ensure the necessary strength and rigidity. However, when the convex part 31e is formed for the lower part 31d, the ridge line of the convex part 31e is the starting point. Deformation is likely to occur.

  In this embodiment, the left and right second reinforcing members 41 and 41 bridge the convex portion 31e and the rear end portions of the left and right side members 7 and 7 in the vehicle width direction. It is possible to suppress deformation at the ridge line portion.

  The left and right second reinforcing members 41 and 41 and the convex portion 31e also function as members that bridge the left and right side members 7 and 7 in the vehicle width direction, and are located below the lower back panel 12. The strength and rigidity of 31d can be improved. As a result, the deformation of the rear part of the vehicle body can be effectively suppressed by the upper part 31c and the lower part 31d of the lower back panel 12.

  As described above, when the left and right side members 7 and 7 are connected to each other by a long reinforcing member, there arises a problem of an increase in vehicle weight and an increase in cost. Since the convex portion 31e that protrudes toward the rear of the vehicle is used as a part, the length of the reinforcing member can be shortened accordingly, and the problems of vehicle weight increase and cost increase can be avoided.

  14 and 15 are views for explaining a rear vehicle body structure according to a fourth embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 13 denote the same or corresponding parts. The fourth embodiment is an example in which the lower back panel 12 is reinforced by the second reinforcing member in the second embodiment.

  A convex portion 31e constituting the rear end portion of the above-described spare tire storage concave portion 6a is formed at a substantially central portion in the vehicle width direction of the lower portion 31d of the lower back inner 31. The convex portion 31e has the same structure as the convex portion 31e of the third embodiment.

  A portion of the lower back inner 31 where the rear end flange portions 7a of the left and right rear side members 7 and 7 are coupled and a portion desired for the closed cross-section portion b of the lower back outer 32 are a first reinforcing member. 40 is connected by bridging in the vertical direction. The first reinforcing member 40 has the same structure as the first reinforcing member 40 in the second embodiment.

  The portion of the lower back inner 31 where the convex portion 31e and the rear end portion of the rear side members 7 and 7 are coupled is bridged by the second reinforcing members 42 and 42 via the first reinforcing members 40 and 40. To be combined.

  The second reinforcing member 42 has a hat-like cross section having a rear wall 42a, an upper wall, and a lower wall 42b, and upper and lower flange portions 42d and 42d, a side flange portion 42e, and an inclined flange portion 42f on the periphery thereof. Is formed.

  An inner end 42g in the vehicle width direction of the rear wall 42a of the second reinforcing member 42 is on the rear end surface 31f of the convex portion 31e, and an outer end 42h in the vehicle width direction is on the vertical wall 40a of the first reinforcing member 40. Each is joined by spot welding. The rear wall 42a, the rear end face 31f, and the vertical wall portion 40a are set to substantially the same height in the vehicle front-rear direction.

  The inclined flange portion 42f is joined to the side surface 31g of the convex portion 31e by spot welding, and the upper and lower flange portions 42d and 42d and the side flange portion 42e are formed at a lower portion 31d of the lower back inner 31, The first reinforcing member 40 is joined to the side wall portion 4b by spot welding.

  In this way, the second reinforcing member 42 has a box shape closed by the lower portion 31d of the lower back inner 31, the convex portion 31e, and the first reinforcing member 40.

  As described above, in the fourth embodiment, the rear side member 7 and the lower back panel 12 are coupled by the first reinforcing member 40 so as to be bridged in the vertical direction, and the second reinforcing members 42 and 42 further connect the lower back panel 12 to the lower back panel 12. Since the projecting portion 31e and the rear side member 7 are coupled so as to be bridged in the vehicle width direction via the first reinforcing member 40, the strength and rigidity of the rear portion of the vehicle body can be further increased, and the rear portion of the vehicle body can be more reliably secured. Deformation can be suppressed.

1 Rear body 7 Rear side member 7a Rear end flange (rear end)
10 Center pillar (pillar member)
11 Quarter member 12 Lower back panel (lower back member)
13 Strut tower 13a Upper side (upper wall surface)
15 Shock absorber 31 Lower back inner 31c Upper part 31d Lower part 32 Lower back outer 35 Continuous member (corner part)
40 1st reinforcement member 41, 42 2nd reinforcement member a, b, c Closed cross-section part

Claims (2)

Left and right pillar members disposed on the outer side in the vehicle width direction and extending in the vehicle vertical direction;
Left and right quarter members arranged to extend rearward from the left and right pillar members;
A lower back member disposed at the rear end of the left and right quarter members so as to extend in the vehicle width direction;
An open car rear vehicle body structure including a strut tower disposed between the lower back member and the left and right quarter members and supporting a shock absorber connected to a rear wheel;
The left and right quarter members and the lower back member are integrally coupled through a continuous member, and the quarter member, the lower back member and the continuous member have a substantially cylindrical closed cross section, and the closed cross section The part is continuous,
The upper side 13a of the strut tower is coupled to the continuous member,
The lower back member is composed of a lower back inner and a lower back outer, and a closed cross-sectional portion of the lower back member is formed by coupling the lower back outer to an upper portion of the lower back inner,
A rear portion of the left and right rear side members extending in the vehicle front-rear direction is coupled to a lower portion of the lower back inner,
A portion of the lower back inner where the rear end portion of the rear side member is joined and a portion constituting the closed cross-sectional portion of the lower back outer are joined by a first reinforcing member so as to be bridged in the vertical direction. <br/> An open car rear body structure characterized by this. In the rear body structure of the open car of the vehicle according to claim 1 ,
A convex portion protruding rearward of the vehicle is formed in a lower portion of the lower back inner, and rear end portions of left and right rear side members extending in the vehicle front-rear direction are coupled to the left and right sides of the convex portion,
The second reinforcing member is coupled to bridge the projecting portion of the lower back inner and the rear end portion of the rear side member in the vehicle width direction,
The rear vehicle body structure of an open car , wherein the second reinforcing member is formed in a box shape and has substantially the same vehicle front-rear direction height as the rear end surface of the convex portion.

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