Rear structure of a vehicle body

Abstract

The present application effectively improves the resistance of a rear side frame to the input of load caused by a collision of a vehicle using a simple structure. A rear portion structure of a vehicle body of the present application includes a rear side frame (10) extending in a vehicle width direction outside in a floor portion (2) of a rear portion of a vehicle body (1) in a front-rear direction of the vehicle body (1), a front cross member (30) connected to a first connection portion (31) of the rear side frame (10), a rear cross member (40) connected to the rear side frame (10) at a second connection portion (41) located more on a rear side than the first connection portion (31), an arm mounting portion (17) provided to the rear side frame (10), and a reinforcing member (60) extending in the vehicle width direction within a cross section of the rear side frame (10) to reinforce the arm mounting portion (17), the reinforcing member (60) being arranged at a position between the first connection portion (31) and the second connection portion (41) in the front-rear direction of the vehicle body (1).

Description

Technical Field

[0001] This invention relates to a rear structure of a vehicle body. Background Technology

[0002] As a rear structure of the vehicle body, for example, Patent Document 1 discloses a configuration in which a load-transferring member is included at a position behind the rear door opening and in front of the wheel house. This load-transferring member is used to transfer the load caused by the impact of a vehicle collision entering the rear door to the side of the vehicle body, thereby suppressing intrusion caused by the displacement of the rear door toward the inside of the passenger compartment.

[0003] [Existing technical documents]

[0004] [Patent Literature]

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-51115 Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] However, in recent years, the number of vehicles with large batteries has increased, leading to an increase in vehicle weight. Consequently, the load input to the vehicle body from side impacts (so-called side collisions) has also increased. If the load input to the vehicle body during a side collision is too large, in the conventional structure described in Patent Document 1, the load input to the rear frame increases, which may cause deformation of the rear frame and potentially fail to adequately suppress intrusion into the passenger compartment.

[0008] The present invention was made in view of the aforementioned problems and aims to provide a rear structure of a vehicle body that effectively improves the tolerance of the rear frame to load input caused by vehicle collisions by utilizing a simple structure, thereby effectively suppressing deformation of the rear of the vehicle body during side collisions. Thus, it improves traffic safety by means of the vehicle and suppresses the decline in traffic flow.

[0009] [Technical means to solve the problem]

[0010] To solve the aforementioned problem, the rear structure of the vehicle body of the present invention is characterized by comprising: a rear side frame 10 extending along the longitudinal direction of the vehicle body 1 on the outer side of the floor portion 2 at the rear of the vehicle body 1 in the vehicle width direction; a front crossbeam 30 extending inward in the vehicle width direction from a first connecting portion 31 connected to the rear side frame 10; a rear crossbeam 40 extending inward in the vehicle width direction from a second connecting portion 41 located further rearward than the first connecting portion 31 connected to the rear side frame 10; an arm mounting portion 17 provided on the rear side frame 10 and connected to a trailing arm; and a reinforcing member 60 extending along the vehicle width direction in the cross section of the rear side frame 10, the reinforcing member 60 being disposed between the first connecting portion 31 and the second connecting portion 41 in the longitudinal direction of the vehicle body 1.

[0011] According to the rear structure of the vehicle body of the present invention, a reinforcing member within the rear side frame is disposed between a first connecting portion of the front crossbeam and a second connecting portion of the rear crossbeam in the rear side frame. Thus, when a load caused by a side impact (side collision) is input to the rear side frame, the load caused by the side impact is transmitted to the front and rear crossbeams via the reinforcing member. Therefore, the rigidity of the rear of the vehicle body is increased, effectively suppressing deformation of the rear (floor) of the vehicle body during a side collision (deformation towards the inner side (inner side of the passenger compartment) in the vehicle width direction).

[0012] Furthermore, the present invention may also include: a wheel cover 50 disposed on the outer side of the rear frame 10 in the vehicle width direction; and a wheel cover gusset plate 90 connecting the wheel cover 50 and the rear frame 10. The wheel cover gusset plate 90 is connected to a third connecting portion 91 provided on the upper surface of the rear frame 10, and a reinforcing member 60 is provided in the cross section of the rear frame 10 at a position parallel to the third connecting portion 91 in the vertical direction.

[0013] According to the structure, the reinforcing member is positioned parallel to the third connection of the wheel arch brace in the rear frame in the vertical direction. Thus, the load from a side impact input to the wheel arch is transferred to the front and rear crossbeams via the reinforcing member. Therefore, the rigidity of the rear of the vehicle body is further improved, and deformation of the rear (floor) of the vehicle body (deformation towards the inside (cabin interior) in the vehicle width direction) during a side impact can be more effectively suppressed.

[0014] Furthermore, the present invention may also include: a first partition member 70, which is disposed in the cross section of the rear frame 10 at a position further forward than the reinforcing member 60. The first partition member 70 is arranged in a position parallel to the first connecting portion 31 in the vehicle width direction and is connected to the front crossbeam 30 via the rear frame 10.

[0015] According to the structure, the first partition member, positioned in front of the reinforcing member, is arranged parallel to the first connecting portion connected to the front crossbeam along the vehicle width direction. Thus, the load from a side impact is transferred to the front crossbeam via the first partition member. Therefore, the rigidity of the rear of the vehicle body is further improved, and deformation of the rear (floor) of the vehicle body (deformation towards the inner side (inner side of the passenger compartment)) during a side impact can be more effectively suppressed. Furthermore, the load from a side impact is distributed between the reinforcing member and the first partition member, thereby more effectively suppressing deformation of the rear frame.

[0016] Furthermore, in the present invention, the arm mounting portion 17 may have a protrusion 17a that protrudes upward in the cross section of the rear frame 10, and the reinforcing member 60 extends above the protrusion 17a in the vehicle width direction and is engaged with the rear frame 10 via the collar member 66 on both sides of the protrusion 17a in the vehicle width direction.

[0017] According to the structure described, a reinforcing member is included above the protrusion of the trailing arm mounting section, thereby transferring the load caused by a side impact input to the protrusion to the front and rear crossbeams via the reinforcing member. Therefore, deformation of the protrusion, which is prone to deformation during a side impact, i.e., deformation of the rear frame, can be suppressed. Furthermore, the reinforcing member can also support the load input from the trailing arm, thus improving the support rigidity of the trailing arm.

[0018] Furthermore, in the present invention, the collar member 66 may also be joined to the reinforcing member 60 by projection welding.

[0019] According to the structure, the collar member is joined to the reinforcing member by projection welding, thereby effectively suppressing rusting at the joint, which is possible in normal inert gas protected welding, thus suppressing the decline in load transfer performance due to years of deterioration.

[0020] Furthermore, the present invention may also include: a side beam 4, which is disposed on the outer side of the vehicle width direction and extends along the front-rear direction of the vehicle body 1, at least a portion of the outer wall portion 12 of the rear vehicle width direction in the rear vehicle frame 10 is formed by the side beam 4, the outer end of the reinforcing member 60 in the vehicle width direction is joined to the side beam 4, and the upper end is joined to the upper wall portion 15 of the rear vehicle frame 10.

[0021] According to the structure, the reinforcing member is joined to the upper wall of the side beam and the rear side frame, thereby facilitating the transfer of loads from side impacts to the reinforcing member and dispersing the loads input to the reinforcing member to the rear side frame. As a result, the rigidity of the rear of the vehicle body is further improved, and deformation of the rear of the vehicle body (floor portion) during a side impact (deformation toward the inward side in the vehicle width direction (inside the passenger compartment)) can be more effectively suppressed.

[0022] Furthermore, in the present invention, at least a portion of the outer wall portion 12 of the rear frame 10 in the vehicle width direction may be formed by a curved portion that is part of the wheel arch 50. The rear structure of the vehicle body includes a second partition member 80, which is disposed in the cross section of the rear frame 10 at a position further rearward than the reinforcing member 60. The second partition member 80 extends obliquely from the curved portion toward the front side of the vehicle body and in the vehicle width direction, and its inner end in the vehicle width direction is engaged with the reinforcing member 60.

[0023] According to the structure, the second partition member extends obliquely from the curved portion forming part of the wheel arch towards the front side of the vehicle body and inward in the vehicle width direction, and the end inward in the vehicle width direction is joined to the reinforcing member. Thus, the load from a side impact input to the wheel arch is transferred to the front and rear crossbeams via the reinforcing member. Therefore, the rigidity of the rear of the vehicle body is further improved, and deformation of the rear (floor) of the vehicle body (deformation towards the inward side (cabin interior) in the vehicle width direction) during a side impact can be more effectively suppressed.

[0024] Furthermore, the present invention may also include: an intermediate member 95, which is joined to the upper side of the reinforcing member 60 and the second dividing member 80 in the cross section of the rear frame 10, and the intermediate member 95 and the wheel arch support plate 90 are arranged in a vertically oriented position.

[0025] According to the structure, by including an intermediate member that engages with the upper side of the reinforcing member and the second partition member, the load caused by a side impact input to the wheel arch can be efficiently transferred / distributed to these reinforcing members and the second partition member. Therefore, the rigidity of the rear frame can be improved, thus effectively suppressing deformation of the rear frame.

[0026] Furthermore, in the present invention, in the rear frame 10, the portion further rearward than the reinforcing member 60 is inclined toward the rear crossbeam 40 in the vehicle width direction, and the rear crossbeam 40 is connected to the wheel arch 50.

[0027] According to the aforementioned structure, the rear frame is inclined towards the rear crossbeam located inside in the vehicle width direction, thereby facilitating the transfer of loads input to the reinforcing members to the rear crossbeam. This improves the rigidity of the rear frame and effectively suppresses its deformation. Furthermore, the connection of the rear crossbeam to the wheel arches enhances the load tolerance transmitted to the rear crossbeams, further improving the rigidity of the rear frame.

[0028] Additionally, the symbols within the parentheses are reference numerals indicating the corresponding components in the embodiments described later, for reference only.

[0029] [The effects of the invention]

[0030] According to the rear structure of the vehicle body of the present invention, a rear structure of the vehicle body is provided that effectively improves the tolerance of the rear side frame to the load input caused by a collision with the vehicle by utilizing a simple structure, thereby effectively suppressing the deformation of the rear part of the vehicle body during a side collision, thereby improving the safety of traffic by means of the vehicle and suppressing the decline in traffic flow. Attached Figure Description

[0031] Figure 1 This is a schematic perspective view of the rear structure of a vehicle to which an embodiment of the present invention is applied, specifically the floor portion at the rear of the vehicle body, viewed from above.

[0032] Figure 2 It is a rough plan view showing the floor section at the rear of the vehicle.

[0033] Figure 3 It is a three-dimensional view showing the rear wheel arch and the rear side frame.

[0034] Figure 4 It is a plan view showing the rear frame and a portion of its surroundings, and is Figure 2 A magnified view of part A.

[0035] Figure 5 It is a cross-sectional view of the rear frame, and it shows... Figure 4 A cross-sectional view of the BB direction.

[0036] Figure 6 It is a three-dimensional view showing the interior of the rear frame and the front end of the rear wheel arch.

[0037] [Explanation of Symbols]

[0038] 1: Body

[0039] 2: Base plate

[0040] 3: Rear bottom panel

[0041] 4: Side beam

[0042] 4b: Rear end

[0043] 10: Rear side frame

[0044] 12: Lateral wall

[0045] 13: Inner wall

[0046] 14: Bottom wall

[0047] 15: Up the wall

[0048] 17: Arm Mounting Section

[0049] 17a: convex part

[0050] 30: Front crossbeam

[0051] 31: Front connecting part (first connecting part)

[0052] 40: Rear crossbeam

[0053] 41: Rear connecting part (second connecting part)

[0054] 50: Rear wheel cover

[0055] 50a: Front end

[0056] 50b: Inner surface

[0057] 50c: Upper end

[0058] 51: Drum Extrusion Section

[0059] 52: Flange portion

[0060] 52a: Top edge

[0061] 53: Rear door opening

[0062] 60: Reinforcing components

[0063] 61: Ontology Department

[0064] 62: Joining plate

[0065] 63: Joining plate

[0066] 64: Joining plate

[0067] 65: Joining plate

[0068] 66: Collar component

[0069] 70: Front partition member (first partition member)

[0070] 71: Ontology Department

[0071] 72: Joining plate

[0072] 73: Joining plate

[0073] 74: Joining plate

[0074] 75: Joining plate

[0075] 80: Rear partition member (second partition member)

[0076] 81: Ontology Department

[0077] 82: Joining plate

[0078] 83: Joining plate

[0079] 84: Joining plate

[0080] 85: Joining plate

[0081] 90: Wheel arch gusset plate

[0082] 90a: Upper end

[0083] 90b: Lower end

[0084] 91: Upper connecting part (third connecting part)

[0085] 95: Intermediate components Detailed Implementation

[0086] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, in the following description, "front" or "rear" refers to the forward direction (front side) or the reverse direction (rear side) of the vehicle body (vehicle). Moreover, "left" and "right" refer to the left and right of the vehicle width direction in the forward direction (front side) of the vehicle body (vehicle), respectively. Furthermore, "up" and "down" refer to the vertical direction (vertical direction) of the vehicle body (vehicle).

[0087] Figure 1 as well as Figure 2 This is a diagram showing the rear floor portion of a vehicle body according to one embodiment of the present invention. Figure 1 This is a rough three-dimensional view of the base plate from above. Figure 2 These are schematic plan views of the floor section. As shown in these figures, the vehicle body 1 of this embodiment includes: a floor section 2, provided at the rear of the vehicle body 1; a pair of rear side frames 10, 10, extending along the longitudinal direction of the vehicle body 1 on the outer side of the floor section 2 in the vehicle width direction; a front crossbeam 30, connecting between the pair of rear side frames 10, 10 and extending inward in the vehicle width direction; a rear crossbeam 40, connecting between the pair of rear side frames 10, 10 at a position further rearward than the front crossbeam 30 and extending inward in the vehicle width direction; and a rear floor panel 3, forming the bottom surface of the floor section 2 between the pair of rear side frames 10, 10.

[0088] On the outer side of each of the two rear side frames 10, 10 in the vehicle width direction, there is a rear wheel cover 50 for accommodating the rear wheel (rear tire) (not shown). Figure 3 This is a perspective view (viewed from the front and inside in the vehicle width direction) showing the rear wheel arch and rear side frame. The rear wheel arch 50 includes: a bulge 51, which has a curved surface shape that covers the rear tire and bulges inward in the vehicle width direction; and a plate-shaped flange 52, which extends vertically outward from the outer side of the bulge 51. The upper edge 52a of the flange 52 forms the lower edge of the rear door opening 53 provided on the side of the vehicle body 1, and is inclined in a manner that gradually decreases from the rear to the front along the front portion of the bulge 51.

[0089] The front crossbeam 30 is connected to the side surface (inner surface) of the inner wall 13 of the rear side frame 10 via a front connecting portion (first connecting portion) 31 located further forward than the front end 50a of the rear wheel arch 50, thus connecting the left and right rear side frames 10 to each other in the vehicle width direction. Furthermore, the rear crossbeam 40 is connected to the side surface (inner surface) of the inner wall 13 of the rear side frame 10 via a rear connecting portion (second connecting portion) 41 located inside the rear wheel arch 50, and extends upward from the rear connecting portion 41 along the inner surface 50b (inner wall of the bulge 51) of the rear wheel arch 50, with both ends reaching the rear wheel arch 50, the upper end 50c of the rear wheel arch 50, and the upper end 50c of the rear wheel arch 50, respectively. Therefore, the rear crossbeam 40 connects the left and right rear side frames 10, 10 to each other, and the left and right rear wheel arches 50, 50 are also connected to each other. Moreover, the adjacent rear side frames 10 and rear wheel arches 50 in the vehicle width direction are also connected by the rear crossbeam 40. In addition, in the longitudinal direction of the vehicle body 1, the front connecting part 31 is located further forward than the rear connecting part 41.

[0090] Figure 4 It is a plan view showing the rear frame and a portion of its surroundings, and is Figure 2 A magnified view of part A. Figure 5 It is a cross-sectional view of the rear frame, and it shows... Figure 4 A cross-sectional view of the BB direction. Furthermore, Figure 6 It is a three-dimensional view showing the interior of the rear frame and the front end of the rear wheel arch.

[0091] Furthermore, the left and right rear side frames 10, 10 and the rear wheel arches 50, 50 are symmetrical in shape and structure; therefore, in the following description, only one of the rear side frames 10 and the rear wheel arches 50 will be described. Also, for ease of explanation, some components may be omitted from the figures. In particular, Figure 4 In the middle section, the upper wall (upper component) 15 of the rear floor panel 3 or the rear side frame 10 described later, as well as the wheel arch brace 90, are omitted from the illustration. Figure 6 The rear bottom panel 3 and the upper wall 15 are omitted from the illustration.

[0092] like Figures 3 to 5As shown, the rear frame 10 includes: an outer wall 12, forming an outer wall portion in the vehicle width direction; an inner wall 13, forming an inner wall portion in the vehicle width direction; a bottom wall 14, forming a bottom (bottom surface); and an upper wall (upper member) 15, forming an upper part (upper surface). The cross-section along the long side, viewed from the front-rear direction, is a closed cross-section with a generally rectangular shape (approximately U-shaped). Furthermore, the outer wall 12 of the rear frame 10, located further rearward than the front end 50a of the rear wheel arch 50, includes the inner surface 50b of the rear wheel arch 50 (the inner wall of the bulge 51), i.e., a curved portion. The outer wall 12 of the rear frame 10, located further forward than the front end 50a of the rear wheel arch 50, includes a side beam 4. The side beam 4 is a long strip-shaped member extending in the front of the rear wheel arch 50, causing both sides of the vehicle body 1 to extend in the front-rear direction. Its rear end 4b is positioned opposite the front end 50a of the rear wheel arch 50. Therefore, the rear end 4b of the side beam 4 and its vicinity extend in the front-rear direction on the outer side of the rear frame 10.

[0093] Moreover, such as Figure 4 As shown, the outer sidewall 12 of the rear frame 10 extends in a generally straight line along the longitudinal direction as part of the side beam 4, further forward than the front end 50a (rear end 4b of the side beam 4) of the rear wheel arch 50. On the other hand, further rearward than the front end 50a of the rear wheel arch 50, it gradually slopes towards the rearward side along the inner surface 50b of the rear wheel arch 50, becoming inward in the vehicle width direction. On the other hand, the inner sidewall 13 of the rear frame 10 slopes from a position further forward than the front connecting portion 31 connected to the front crossbeam 30 to the rear connecting portion 41 connected to the rear crossbeam 40, gradually becoming inward in the vehicle width direction from the front to the rear. Thus, the rear crossbeam 40 is formed from the front connecting portion 31 to the rear connecting portion 41 in a way that gradually widens in the vehicle width direction (width dimension of the cross section) from the front to the rear connecting portion 41.

[0094] Moreover, such as Figure 4 as well as Figure 5 As shown, an arm mounting portion 17 is provided on the rear frame 10 for mounting a trailing arm (not shown), which is a component of the rear suspension. The arm mounting portion 17 has a protrusion 17a that is provided on the bottom wall (bottom surface) 14 of the rear frame 10 and bulges upward, and a recess 17b that is recessed upward on its lower surface side (lower surface of the rear frame 10). The components of the trailing arm are connected to the recess 17b. Therefore, the arm mounting portion 17 is formed as a protruding protrusion in the cross-section of the rear frame 10. The arm mounting portion 17 is positioned in the rear frame 10 in the vehicle width direction alongside the front end 50a of the rear wheel arch 50 and the rear end 4b of the side beam 4, and is positioned alongside the front connecting portion 31 that connects to the front crossbeam 30.

[0095] Furthermore, a reinforcing member 60 is provided in the cross-section of the rear frame 10 to reinforce the arm mounting portion 17. The reinforcing member 60 is a metal plate-shaped member extending in the vehicle width direction within the cross-section of the rear frame 10, and includes: a generally flat body portion 61 extending in the vehicle width direction from the outer side wall 12 to the inner side wall 13 of the rear frame 10; and tongue-shaped connecting pieces 62 to 65, respectively connected to the left and right end edges and the lower and upper end edges of the body portion 61. Figure 5 As shown, the reinforcing member 60 is positioned directly above the arm mounting portion 17 in the cross-section of the rear frame 10, extending across the arm mounting portion 17 in the vehicle width direction (left-right direction). The lower end edge of the body portion 61 of the reinforcing member 60 abuts against the upper surface of the arm mounting portion 17 (protrusion 17a).

[0096] Furthermore, the inner connecting piece 63 of the reinforcing member 60 is welded to the inner wall 13 of the rear frame 10 and the inner connecting piece 83 of the rear partition member 80 (described later), while the outer connecting piece 62 is welded to the inner surface of the outer wall 12 of the rear frame 10, i.e., the side beam 4. Moreover, the upper connecting piece 65 of the reinforcing member 60 is bonded to the intermediate member 95 (described later) and the upper wall (upper member) 15 of the rear frame 10 by means of adhesive. On the other hand, the lower connecting piece 64 of the reinforcing member 60 is connected to the bottom wall 14 of the rear frame 10 via collar members 66 on both sides (left and right sides) of the arm mounting portion 17 in the vehicle width direction. The collar member 66 is a long, cylindrical member extending vertically along its long side; its upper end is welded to the lower connecting piece 64 of the reinforcing member 60, and its lower end is welded to the bottom wall 14 of the rear frame 10. Furthermore, ideally, the upper end of the collar member 66 is welded to the mating piece 64 of the reinforcing member 60 by projection welding.

[0097] Thus, the outer end of the reinforcing member 60 located in the cross section of the rear frame 10 in the vehicle width direction is joined (welded) to the side beam 4, and the upper end is joined (bonded) to the upper wall (upper member) 15 of the rear frame 10.

[0098] Furthermore, the reinforcing member 60 is positioned in the longitudinal direction of the rear frame 10 between the front connecting part 31 that connects to the front crossbeam 30 and the rear connecting part 41 that connects to the rear crossbeam 40.

[0099] A front partition member (first partition member) 70 is provided in the cross-section of the rear frame 10, positioned forward of the reinforcing member 60 and the arm mounting portion 17. The front partition member 70 is a metal plate-shaped member extending in the vehicle width direction within the cross-section of the rear frame 10, and includes: a generally flat body portion 71 extending from the outer side wall 12 to the inner side wall 13 of the rear frame 10 in the vehicle width direction; and tongue-shaped connecting pieces 72 to 75, respectively connected to the left and right end edges and the upper and lower end edges of the body portion 71. The front partition member 70 is positioned in the cross-section of the rear frame 10, parallel to the front connecting portion 31 in the vehicle width direction.

[0100] Furthermore, the inner connecting piece 73 of the front partition member 70 is welded to the inner wall 13 of the rear frame 10 and the end of the front crossbeam 30 in the front connecting portion 31. That is, the front partition member 70 is joined to the front crossbeam 30 via the inner wall 13 of the rear frame 10. Moreover, the outer connecting piece 72 of the front partition member 70 is welded to the inner surface of the outer wall 12 of the rear frame 10, i.e., the side beam 4. Furthermore, the upper connecting piece 75 of the front partition member 70 is welded to the upper wall (upper member) 15 of the rear frame 10, and the lower connecting piece 74 is welded to the bottom wall 14.

[0101] Furthermore, a rearward partition member (second partition member) 80 is provided in the cross-section of the rear frame 10, further rearward than the reinforcing member 60 and the arm mounting portion 17. The rearward partition member 80 is a metal plate-shaped member extending in the vehicle width direction within the cross-section of the rear frame 10, extending obliquely towards the front of the vehicle body and inward in the vehicle width direction. The rearward partition member 80 includes: a generally flat body portion 81 extending obliquely in the vehicle width direction from the outer side wall 12 of the rear frame 10, i.e., the inner surface 50b of the rear wheel arch 50, to the inner side wall 13; and tongue-shaped connecting pieces 82 to 85, respectively connected to the left and right end edges and the upper and lower end edges of the body portion 81.

[0102] Furthermore, the inner connecting piece 83 of the rear partition member 80 is welded to the inner wall 13 of the rear frame 10 and the inner connecting piece 63 of the reinforcing member 60. That is, the inner end of the rear partition member 80 in the vehicle width direction is joined to the reinforcing member 60. Moreover, the outer connecting piece 82 of the rear partition member 80 is welded to the inner surface 50b of the outer wall 12 of the rear frame 10, i.e., the rear wheel arch 50. Furthermore, the upper connecting piece 85 of the rear partition member 80 is joined to the intermediate member 95 (described later) by adhesive bonding, and the lower connecting piece 84 is welded to the bottom wall 14.

[0103] Moreover, such as Figure 2 as well as Figure 6 As shown, a wheel arch gusset plate 90 is provided, extending from the front end portion 50a of the rear wheel arch 50 toward the upper wall 15 (upper surface) of the rear frame 10 and connecting them. The wheel arch gusset plate 90 is a metal component provided such that it extends from the front end portion 50a of the rear wheel arch 50 toward the inward and downward side in the vehicle width direction and covers the upper wall 15 of the rear frame 10. The upper end portion 90a of the wheel arch gusset plate 90 is welded to the vicinity of the front end portion 50a of the rear wheel arch 50 (bulge 51) and the upper edge 52a of the flange portion 52. Furthermore, Figure 2 The diagram only shows one of the left and right wheel arch support plates 90 and 90.

[0104] Furthermore, an intermediate member 95 is provided, which is joined (bonded) to the upper side of the reinforcing member 60 and the rear partition member 80 within the cross-section of the rear frame 10. The lower end 90b of the wheel arch gusset plate 90 is joined to the intermediate member 95 via the upper wall (upper member) 15 of the rear frame 10. Therefore, the wheel arch gusset plate 90 is joined to the rear partition member 80 and the reinforcing member 60 within the cross-section of the rear frame 10 via the intermediate member 95. Thus, the wheel arch gusset plate 90 and the intermediate member 95 are joined by welding via the cover portion, i.e., the upper wall (upper member) 15 of the rear frame 10.

[0105] The intermediate member 95 is a metal plate-shaped member, and its cross-sectional shape, viewed from the vehicle width direction, is a concave shape opening upwards, that is, a roughly U-shaped cross-section convex downwards. Furthermore, a connecting piece 85 on the upper side of the rear partition member 80 is joined to the lower surface of the cross-sectional portion of the intermediate member 95. The joining portion of the lower surface of the intermediate member 95 and the connecting piece of the rear partition member 80 is joined by means of an adhesive.

[0106] The rear partition member 80, the intermediate member 95, and the reinforcing member 60 are positioned directly below the upper connecting part (third connecting part) 91 of the wheel arch gusset plate 90, which is connected to the rear frame 10. These rear partition members 80, the intermediate member 95, and the reinforcing member 60 are positioned in the vertical direction alongside the lower end 90b of the wheel arch gusset plate 90 and the upper connecting part 91.

[0107] Moreover, such as Figure 4 As shown, the front connecting portion 31 of the rear frame 10, which connects to the front crossbeam 30, is positioned further forward than the rear partition member 80 within the rear frame 10. Furthermore, the end of the front crossbeam 30 connected to the front connecting portion 31 on the rear frame 10 side extends towards the rear of the vehicle body 1 (towards the rear partition member 80) (see reference). Figure 4(Part C). In other words, the end of the front crossbeam 30 is inclined towards the outside in the vehicle width direction and gradually becomes the rear side, and this part is inclinedly connected to the inner wall 13 of the rear frame 10. Thus, the end of the front crossbeam 30 on the rear frame 10 side extends towards the rear side of the vehicle body 1, that is, towards the rear partition member 80.

[0108] The rear structure of the vehicle body in this embodiment includes: a rear side frame 10, which extends along the longitudinal direction of the vehicle body 1 on the outer side of the floor portion 2 at the rear of the vehicle body 1 in the vehicle width direction; a front crossbeam 30, which extends inward in the vehicle width direction connected to the front side connecting portion (first connecting portion) 31 of the rear side frame 10; a rear crossbeam 40, which extends inward in the vehicle width direction connected to the rear side frame 10 at a rear side connecting portion (second connecting portion) 41 located further rearward than the front side connecting portion 31; an arm mounting portion 17, which is provided on the rear side frame 10 and connects to a trailing arm (suspension component); and a reinforcing member 60, which extends along the vehicle width direction in the cross section of the rear side frame 10, and the reinforcing member 60 is disposed between the front side connecting portion 31 and the rear side connecting portion 41 in the longitudinal direction of the vehicle body 1.

[0109] According to the rear structure of the vehicle body 1 in this embodiment, the reinforcing member 60 in the rear frame 10 is disposed between the front connecting portion 31 of the front crossbeam 30 and the rear connecting portion 41 of the rear crossbeam 40 in the rear frame 10. Therefore, when a load caused by a side impact (side collision) is input to the rear frame 10, the load caused by the side impact is transmitted to the front crossbeam 30 and the rear crossbeam 40 via the reinforcing member 60. Thus, the rigidity of the rear of the vehicle body 1 is improved, and deformation of the rear of the vehicle body 1 (floor portion 2) during a side collision (deformation towards the inner side (inner side of the passenger compartment) in the vehicle width direction) can be effectively suppressed.

[0110] Furthermore, this embodiment includes: a rear wheel arch 50, disposed on the outer side of the rear frame 10 in the vehicle width direction; and a wheel arch gusset plate 90, connecting the rear wheel arch 50 and the rear frame 10. The wheel arch gusset plate 90 is connected to an upper connecting portion (third connecting portion) 91 provided on the upper wall 15 (upper surface) of the rear frame 10, and a reinforcing member 60 is disposed in the cross-section of the rear frame 10 at a position parallel to the upper connecting portion 91 in the vertical direction.

[0111] According to the structure, the reinforcing member 60 is positioned parallel to the upper connecting portion 91 of the connecting wheel arch gusset plate 90 in the rear frame 10 in the vertical direction. Thus, the load from a side impact input to the rear wheel arch 50 is transmitted to the front crossbeam 30 and the rear crossbeam 40 via the reinforcing member 60. Therefore, the rigidity of the rear part of the vehicle body 1 is further improved, and deformation of the rear part (floor portion 2) of the vehicle body 1 during a side impact (deformation towards the inward side in the vehicle width direction (inside the passenger compartment)) can be more effectively suppressed.

[0112] Furthermore, this embodiment includes a front partition member 70, which is located in the cross section of the rear frame 10 at a position further forward than the reinforcing member 60. The front partition member 70 is arranged side by side with the front connecting portion 31 in the vehicle width direction and is connected to the front crossbeam 30 via the rear frame 10.

[0113] According to the structure described, the front partition member 70, located in front of the reinforcing member 60, is positioned parallel to the front connecting portion 31, which is connected to the front crossbeam 30, along the vehicle width direction. Therefore, the load from a side impact is transferred to the front crossbeam 30 via the front partition member 70. Consequently, the rigidity of the rear of the vehicle body 1 is further improved, and deformation of the rear (floor portion 2) of the vehicle body 1 during a side impact (deformation towards the inward side (inner side of the passenger compartment)) is more effectively suppressed.

[0114] Furthermore, the load from a side impact is distributed to the reinforcing member 60 and the front partition member 70, thus more effectively suppressing the deformation of the rear frame 10.

[0115] Furthermore, in this embodiment, the arm mounting portion 17 has a protrusion 17a that protrudes upward in the cross section of the rear frame 10, and the reinforcing member 60 extends above the protrusion 17a in the vehicle width direction and is connected to the rear frame 10 via the collar member 66 on both sides of the protrusion 17a in the vehicle width direction.

[0116] According to the structure described, a reinforcing member 60 is included above the protrusion 17a of the arm mounting portion 17 where the tow arm is mounted. Thus, the load caused by a side impact input to the protrusion 17a is transmitted to the front crossbeam 30 and the rear crossbeam 40 via the reinforcing member 60. Therefore, deformation of the protrusion 17a and the rear frame 10, which are prone to deformation during side impacts, can be suppressed. Furthermore, the reinforcing member 60 can also support the load input from the tow arm, thereby improving the support rigidity of the tow arm.

[0117] Furthermore, in this embodiment, the collar member 66 is joined to the reinforcing member 60 by projection welding.

[0118] According to the structure, rust may occur during normal inert gas protected welding, but by joining the collar member 66 to the reinforcing member 60 by projection welding, rust at the joint can be effectively suppressed, thereby suppressing the decline in load transfer performance caused by years of deterioration.

[0119] Furthermore, in this embodiment, at least a portion of the outer wall 12 in the rear frame 10 is formed by the side beam 4, the outer end of the reinforcing member 60 in the vehicle width direction is joined to the side beam 4 by welding, and the upper end is joined to the upper member (the cover of the rear frame 10) constituting the upper wall 15 of the rear frame 10 by adhesive bonding.

[0120] According to the structure, the reinforcing member 60 is joined to the upper wall (upper member) 15 of the side beam 4 and the rear side frame 10. As a result, the load caused by the side collision is easily transferred to the reinforcing member 60, and the load input to the reinforcing member 60 can be distributed to the rear side frame 10. As a result, the rigidity of the rear part of the body 1 is further improved, and the deformation of the rear part (floor 2) of the body 1 (deformation toward the inside of the vehicle width direction (inside the passenger compartment)) during the side collision can be suppressed more effectively.

[0121] Furthermore, in this embodiment, at least a portion of the outer side wall 12 of the rear frame 10 in the vehicle width direction is formed by a curved portion of the inner surface 50b, which is part of the rear wheel arch 50. Additionally, the rear structure of the vehicle body includes a rear partition member 80, which is disposed in the cross-section of the rear frame 10 at a position further rearward than the reinforcing member 60. The rear partition member 80 extends obliquely from the inner surface 50b of the rear wheel arch 50 (which is a curved portion) towards the front of the vehicle body 1 and inward in the vehicle width direction, and its inner end in the vehicle width direction engages with the reinforcing member 60.

[0122] According to the structure, the load from a side impact input to the rear wheel arch 50 will be transferred to the front crossbeam 30 and the rear crossbeam 40 via the reinforcing member 60. Therefore, the rigidity of the rear part of the vehicle body 1 is further improved, and the deformation of the rear part (floor 2) of the vehicle body 1 during a side impact (deformation toward the inside in the vehicle width direction (inside the passenger compartment)) can be suppressed more effectively.

[0123] Furthermore, this embodiment includes an intermediate member 95, which is joined (bonded) to the upper side of the reinforcing member 60 and the rear partition member 80 within the cross-section of the rear frame 10. The intermediate member 95 and the wheel arch gusset plate 90 are arranged in a vertically aligned position.

[0124] According to the structure, by including an intermediate member 95 that engages above the reinforcing member 60 and the rear partition member, the load caused by a side impact input to the rear wheel arch 50 can be efficiently transferred / distributed to the reinforcing member 60 and the rear partition member 80. Therefore, the rigidity of the rear frame 10 can be improved, and thus deformation of the rear frame 10 can be effectively suppressed.

[0125] Furthermore, in this embodiment, in the rear frame 10, the portion further rearward than the reinforcing member 60 is inclined toward the rear crossbeam 40 in the vehicle width direction, and the rear crossbeam 40 is connected to the rear wheel arch 50.

[0126] According to the structure described, the rear frame 10 is inclined toward the rear crossbeam 40 located inside in the vehicle width direction, thereby facilitating the transfer of loads input to the reinforcing member 60 to the rear crossbeam 40. Therefore, the rigidity of the rear frame 10 can be improved, thus effectively suppressing deformation of the rear frame 10.

[0127] The embodiments of the present invention have been described above, but the present invention is not limited to the described embodiments, and various modifications can be made within the scope of the technical concept described in the claims, specification and drawings.

Claims

1. A rear structure of a vehicle body, characterized in that, include: The rear frame extends along the front-rear direction of the vehicle body on the outer side of the floor section at the rear of the vehicle body in the width direction. The front crossbeam is connected to the first connection of the rear frame and extends inward in the vehicle width direction; The rear crossbeam is connected to the rear frame at a second connection located further rearward than the first connection and extends inward in the vehicle width direction. An arm mounting section is provided on the rear side frame and connected to the tow arm; as well as A reinforcing member extends along the vehicle width direction within the cross-section of the rear frame above the arm mounting portion. The reinforcing member is positioned between the first connecting portion and the second connecting portion in the longitudinal direction of the vehicle body.

2. The rear structure of the vehicle body according to claim 1, characterized in that, include: Wheel covers are disposed on the outer side of the rear frame in the vehicle width direction; as well as Wheel arch gussets connect the wheel arch to the rear frame. The wheel arch gusset plate is connected to a third connection portion located on the upper surface of the rear frame. The reinforcing member is disposed in the cross-section of the rear frame at a position parallel to the third connecting part in the vertical direction.

3. The rear structure of the vehicle body according to claim 1, characterized in that, include: The first partition member is located in the cross-section of the rear frame at a position further forward than the reinforcing member. The first partition member is positioned alongside the first connecting portion in the vehicle width direction and is connected to the front crossbeam via the rear side frame.

4. The rear structure of the vehicle body according to claim 1, characterized in that, The arm mounting portion has a protrusion that protrudes upwards within the cross-section of the rear frame. The reinforcing member extends above the protrusion in the vehicle width direction and is joined to the rear frame via collar members on both sides of the protrusion in the vehicle width direction.

5. The rear structure of the vehicle body according to claim 4, characterized in that, The collar member is joined to the reinforcing member by projection welding.

6. The rear structure of the vehicle body according to claim 1, characterized in that, include: The side beam is positioned on the outer side of the vehicle body in the width direction, and extends along the longitudinal direction of the vehicle body. At least a portion of the outer wall portion of the rear frame in the vehicle width direction is formed by the side beam. The outer end of the reinforcing member in the vehicle width direction is joined to the side beam, and the upper end is joined to the upper wall of the rear frame.

7. The rear structure of the vehicle body according to claim 2, characterized in that, At least a portion of the outer wall of the rear frame in the vehicle width direction is formed by a curved portion that is part of the wheel arch. The rear structure of the vehicle body includes a second partition member, which is located further rearward than the reinforcing member within the cross-section of the rear side frame. The second partition member extends obliquely from the curved portion toward the front side of the vehicle body and in the vehicle width direction, and the end in the vehicle width direction is engaged with the reinforcing member.

8. The rear structure of the vehicle body according to claim 7, characterized in that, include: The intermediate member is joined to the upper side of the reinforcing member and the second partition member within the cross-section of the rear frame. The intermediate component and the wheel arch gusset plate are arranged in a vertically aligned manner.

9. The rear structure of the vehicle body according to claim 1, characterized in that, In the rear frame, the portion further rearward than the reinforcing member is inclined towards the rear crossbeam in the vehicle width direction. The rear crossbeam is connected to the wheel arch.

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