Rear structure of a vehicle body

Abstract

The present invention provides a rear structure of a vehicle body capable of effectively improving the connection strength of a sub frame with a simple structure. The rear structure of the vehicle body of the present invention includes a floor panel (3) constituting a floor portion (2) of a rear portion of a vehicle body (1), a rear side frame (10) extending in a front-rear direction of the vehicle body (1) at an outer side in a vehicle width direction in the floor panel (3), and a sub frame (5) provided below the floor panel (3) to support a suspension member, the rear side frame (10) including a sub frame fastening portion (60) fastening the sub frame (5), the sub frame fastening portion (60) linking the rear side frame (10) and the floor panel (3).

Description

TECHNICAL FIELD

[0001] The present application relates to a rear structure of a vehicle body. BACKGROUND

[0002] In the past, as a structure in which a sub frame or the like that supports a device such as a motor or an engine or a structure such as a suspension is mounted to a main body of a vehicle body, there is, for example, the structure shown in Patent Document 1. In the structure of Patent Document 1, a fastening member that supports a motor in a front-rear direction of a vehicle while being fastened to an upper cross member is included, and thereby the support rigidity of a motor unit is ensured.

[0003] [Related Art Documents]

[0004] [Patent Documents]

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-114785 SUMMARY

[0006] [Problems to be Solved by the Invention]

[0007] However, in recent years, with the spread of electric vehicles or hybrid vehicles, vehicles including large batteries are increasing. In the case where a large battery or the like is mounted in a vehicle body, if the layout with other devices or the like is considered, it can be impossible to mount a support member of a sub frame or the like to a cross member on the vehicle body side, and in this case, it can be difficult to ensure sufficient support rigidity of a device supported by a sub frame or the like, and even the strength required for the rear portion of the vehicle body.

[0008] The present application was made in view of the above-described problems, and aims to provide a rear structure of a vehicle body that can effectively increase the connection strength of a sub frame with a simple structure, ensure the strength required for the rear portion of the vehicle body, and thereby improve the safety of traffic by a vehicle while suppressing the decrease in the smoothness of traffic.

[0009] [Technical Means for Solving the Problems]

[0010] To solve the above-described problems, the rear structure of a vehicle body of the present application includes a floor panel 3 that constitutes a floor portion 2 of a rear portion of a vehicle body 1, a rear side frame 10 that extends in a front-rear direction of the vehicle body 1 on an outer side in a vehicle width direction in the floor panel 3, and a sub frame 5 that is provided below the floor panel 3 to support a suspension member, the rear side frame 10 includes a sub frame fastening portion 60 that fastens the sub frame 5, and the sub frame fastening portion 60 links the rear side frame 10 and the floor panel 3.

[0011] According to the rear structure of the vehicle body of the present application, the sub-frame fastening portion of the rear side frame links the rear side frame and the floor panel, whereby the load input from the sub-frame to the rear side frame can be dispersed to the rear side frame and the floor panel by the sub-frame fastening portion. Therefore, the connection strength of the sub-frame can be effectively improved, and thus the strength required for the rear portion of the vehicle body can be ensured.

[0012] Further, in the present application, a wheel cover 50 can be provided on the outer side of the rear side frame 10 in the vehicle width direction, and a cross member 40 can extend from the wheel cover 50 toward the inner side in the vehicle width direction on the upper surface side of the floor panel 3, and the sub-frame fastening portion 60 can be joined to the cross member 40 via the floor panel 3.

[0013] According to the above structure, the sub-frame fastening portion is joined to the cross member extending from the wheel cover toward the inner side in the vehicle width direction, whereby the load input from the sub-frame can also be dispersed to the cross member, and thus the connection strength of the sub-frame can be further improved.

[0014] Further, in the present application, the sub-frame fastening portion 60 can include a first connecting member 61 linking the wall portion 13 on the inner side in the vehicle width direction of the rear side frame 10 and the floor panel 3.

[0015] According to the above structure, by including the first connecting member linking the rear side frame and the floor panel, the load input from the sub-frame to the rear side frame can be dispersed to the floor panel via the first connecting member, and the load input to the rear side frame can be transmitted to the cross member or the floor panel. Therefore, with respect to the load toward the inner side in the vehicle width direction with respect to the rear side frame, displacement of the rear side frame toward the same direction (tilting toward the inner side in the vehicle width direction) can be suppressed, and thus the connection strength of the sub-frame can be effectively improved.

[0016] Further, in the present application, the sub-frame fastening portion 60 can include a second connecting member 62 provided so as to straddle the wall portion 14 on the lower side of the rear side frame 10 and the first connecting member 61.

[0017] According to the above structure, by including the second connecting member provided so as to straddle the wall portion on the lower side of the rear side frame and the first connecting member, the load input from the sub-frame can be dispersed to the first connecting member and the rear side frame via the second connecting member, and thus the connection strength of the sub-frame can be further improved.

[0018] Further, in the present application, the first connecting member 61 can link the wall portion 13 on the inner side and the wall portion 14 on the lower side of the rear side frame 10, and have a shape in which the width dimension in the front-rear direction becomes smaller as it goes toward the inner side in the vehicle width direction from the rear side frame 10.

[0019] According to the structure, the first connecting member is in a shape in which a width dimension in the front-rear direction gradually decreases toward the inner side in the vehicle width direction, and in addition, the inner side wall portion and the lower side wall portion of the rear side frame are connected, whereby it is possible to disperse the load input from the sub frame, and it is possible to more efficiently transmit the load input to the first connecting member from the rear side frame to the cross member or the floor panel. Therefore, with respect to the load toward the inner side in the vehicle width direction with respect to the rear side frame, it is possible to more effectively suppress displacement of the rear side frame in the same direction (tilting toward the inner side in the vehicle width direction), and thus it is possible to more effectively improve the connection strength of the sub frame.

[0020] Further, in the present application, the second connecting member 62 can be connected to the first connecting member 61, and can be connected to the lower side wall portion 14 of the rear side frame 10 and the outer side wall portion (12) in the vehicle width direction.

[0021] According to the structure, by connecting the second connecting member to the first connecting member, and connecting the lower side wall portion of the rear side frame and the outer side wall portion in the vehicle width direction, it is possible to disperse the load input to the second connecting member from the sub frame to the first connecting member and the rear side frame, and it is possible to further improve the connection strength of the sub frame.

[0022] Further, in the present application, it can include a first ridge line 61a provided to the first connecting member 61, and a second ridge line 62a provided to the second connecting member 62, extending from the sub frame fastening surface 62b in the sub frame fastening portion 60 to the floor panel 3, and the first ridge line 61a and the second ridge line 62a are arranged in a manner in which they are continuous with each other.

[0023] According to the structure, the second ridge line of the second connecting member extending from the sub frame fastening surface to the floor panel is arranged in a manner in which it is continuous with the first ridge line of the first connecting member, whereby it is possible to smoothly transmit the load input from the sub frame to the first connecting member and the cross member, and thus it is possible to further improve the connection strength of the sub frame.

[0024] Further, in the present application, it can include a reinforcement frame 80 located at a position further inward in the vehicle width direction than the sub frame fastening portion 60, the reinforcement frame 80 extending in the front-rear direction of the vehicle body 1 and intersecting the cross member 40.

[0025] According to the structure, the reinforcement frame located at a position further inward in the vehicle width direction than the sub frame fastening portion extends in the front-rear direction of the vehicle body and intersects the cross member, and thus it is possible to transmit the load input to the cross member from the sub frame to the reinforcement frame, and thus it is possible to further improve the connection strength of the sub frame.

[0026] In addition, the symbols in the brackets are reference numerals of the drawing for showing corresponding constituent members in the embodiments described later.

[0027] [Effects of the Invention]

[0028] According to the present application, a rear structure of a vehicle body can effectively improve the connection strength of a sub frame with a simple structure, thereby ensuring the required strength of the rear of the vehicle body, and thus, can improve the safety of traffic by the vehicle and suppress the decrease in the smoothness of traffic. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic perspective view of a floor portion of the rear of the vehicle body, which is viewed from above, of a rear structure of a vehicle to which an embodiment of the present application is applied.

[0030] Figure 2 is a schematic plan view (floor plan) of the floor portion of the rear of the vehicle body, which is viewed from the lower surface side.

[0031] Figure 3 is a partial enlarged view of the A portion of Figure 2

[0032] Figure 4 is a perspective view of the sub frame fastening portion, and is a view in which the illustration of the second connecting member is omitted.

[0033] Figure 5 is a perspective view of the sub frame fastening portion.

[0034] Figure 6 is a view of the floor portion of the rear of the vehicle body, which is viewed from the side.

[0035] Figure 7 is a view of the cross section of the sub frame fastening portion, and is a view of the B-B cross-sectional view of Figure 3

[0036] [Explanation of Symbols]

[0037] 1: vehicle body

[0038] 2: floor portion

[0039] 3: rear floor panel (floor panel)

[0040] 4: side sill

[0041] 4b: rear end portion

[0042] 5: sub frame

[0043] 10: rear side frame

[0044] 12: outer side wall

[0045] 13: inner side wall (inner side wall portion)

[0046] ​​14: lower wall (lower side wall portion)

[0047] 15: stiffener

[0048] 16: weld

[0049] 17: arm mounting portion

[0050] 17b: recess

[0051] 30: front cross member

[0052] 31: front side connecting portion

[0053] 40: rear cross member (cross member)

[0054] 41: rear side connecting portion

[0055] 50: rear wheel house (wheel house)

[0056] 50a: front end portion

[0057] 50b: inner surface

[0058] 50c: upper end portion

[0059] 51: bulge portion

[0060] 60: subframe fastening portion

[0061] 61: first connecting member

[0062] 61a: first ridge line

[0063] 62: second connecting member

[0064] 62a: second ridge line

[0065] 62b: subframe fastening surface

[0066] 62c: opening portion

[0067] 70: boss member

[0068] 80: reinforcing frame

[0069] 80a: front side end portion

[0070] 80b: rear side end portion DETAILED DESCRIPTION

[0071] Embodiments of the present application will be described below in detail with reference to the accompanying drawings. Note that in the following description, the front or the rear refers to the front or the rear of the vehicle body (vehicle) described later. Also, the left or the right refers to the left or the right of the vehicle body (vehicle) in the state facing the front (front side) of the vehicle body (vehicle). Also, the upper or the lower refers to the upper or the lower of the vehicle body (vehicle) in the vertical direction (vertical direction).

[0072] Figure 1 and Figure 2 is a view of the floor portion at the rear of the vehicle body showing the rear structure of the vehicle to which an embodiment of the present application is applied, Figure 1 is a schematic perspective view of the floor portion viewed from above, Figure 2 is a plan view (floor plan) of the floor portion viewed from the lower surface side. As shown in these views, the vehicle body 1 of the present embodiment includes a floor portion 2 provided at the rear of the vehicle body 1, a pair of rear side frames 10, 10 extending in the front-rear direction of the vehicle body 1 on the outer sides in the vehicle width direction in the floor portion 2, a front cross member 30 coupled between the pair of rear side frames 10, 10 and extending toward the inner side in the vehicle width direction, a rear cross member 40 coupled between the pair of rear side frames 10, 10 at a position further to the rear than the front cross member 30 and extending toward the inner side in the vehicle width direction, and a rear floor panel 3 constituting the floor surface of the floor portion 2 between the pair of rear side frames 10, 10.

[0073] On the outer sides in the vehicle width direction of the respective rear side frames 10, 10, there are provided rear wheel housings 50, 50 that house rear wheels (rear tires) (not shown). The rear wheel housings 50 include bulging portions 51 having curved surface-like shapes that cover the outer shapes of the rear tires and bulge toward the inner side in the vehicle width direction.

[0074] The front cross member 30 is coupled to the side surface (inner surface) of the inner side wall 13 of the rear side frame 10 at a front side coupling portion (first coupling portion) 31 provided at a position further to the front than the front end portion 50a of the rear wheel housing 50 in the rear side frame 10, and connects the left and right rear side frames 10, 10 to each other in the vehicle width direction. Also, the rear cross member 40 is coupled to the side surface (inner surface) of the inner side wall 13 of the rear side frame 10 in a rear side coupling portion (second coupling portion) 41 provided at a position inside the rear wheel housing 50 in the rear side frame 10, and further extends upward from the rear side coupling portion 41 along the inner surface 50b (inner wall of the bulging portion 51) of the rear wheel housing 50, with both end portions 40c, 40c reaching the upper end portions 50c, 50c of the rear wheel housings 50, 50, respectively. Thus, the rear cross member 40 connects the left and right rear side frames 10, 10 to each other, and also connects the left and right rear wheel housings 50, 50 to each other. Also, the rear side frame 10 and the rear wheel housing 50 that are adjacent in the vehicle width direction are coupled by the rear cross member 40.

[0075] Also, as shown in FIG. 1, a pair of rear side frames 10, 10 are provided at positions inward of the rear side frames 10, 10 in the vehicle width direction. The rear side frames 10, 10 extend in the front-rear direction of the vehicle body 1. The rear side frames 10, 10 are formed in a closed cross-sectional shape of a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The outer side walls 12 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The inner side walls 13 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The bottom walls (lower walls) 14 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The upper walls (not shown) of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. Figure 2 Also, as shown in FIG. 1, a pair of rear side frames 10, 10 are provided at positions inward of the rear side frames 10, 10 in the vehicle width direction. The rear side frames 10, 10 extend in the front-rear direction of the vehicle body 1. The rear side frames 10, 10 are formed in a closed cross-sectional shape of a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The outer side walls 12 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The inner side walls 13 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The bottom walls (lower walls) 14 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The upper walls (not shown) of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction.

[0076] Also, as shown in FIG. 1, a pair of rear side frames 10, 10 are provided at positions inward of the rear side frames 10, 10 in the vehicle width direction. The rear side frames 10, 10 extend in the front-rear direction of the vehicle body 1. The rear side frames 10, 10 are formed in a closed cross-sectional shape of a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The outer side walls 12 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The inner side walls 13 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The bottom walls (lower walls) 14 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The upper walls (not shown) of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction.

[0077] The rear side frame 10 includes an outer side wall 12 that constitutes a wall portion on the outer side in the vehicle width direction, an inner side wall 13 that constitutes a wall portion on the inner side in the vehicle width direction, a bottom wall (lower wall) 14 that constitutes a bottom portion (bottom surface), and an upper wall (not shown) that constitutes an upper portion (upper surface). A cross section in the longitudinal direction viewed in the front-rear direction is formed in a substantially rectangular shape (substantially H-shaped) closed cross-sectional shape. Also, the outer side wall 12 of the rear side frame 10 at a position more rearward than the front end portion 50a of the rear wheel cover 50 includes the inner surface 50b of the rear wheel cover 50 (the inner wall of the bulging portion 51), and the outer side wall 12 of the rear side frame 10 at a position more forward than the front end portion 50a of the rear wheel cover 50 includes the inner side surface of the side beam 4. The side beam 4 is a long, strip-shaped member that extends in the front-rear direction with both sides of the vehicle body extending forward of the front end portion 50a of the rear wheel cover 50, and the rear end portion 4b thereof is disposed at a position facing the front end portion 50a of the rear wheel cover 50. Therefore, the rear end portion 4b of the side beam 4 and the vicinity thereof extend in the front-rear direction on the outer side of the rear side frame 10.

[0078] Also, as shown in FIG. 1, a pair of rear side frames 10, 10 are provided at positions inward of the rear side frames 10, 10 in the vehicle width direction. The rear side frames 10, 10 extend in the front-rear direction of the vehicle body 1. The rear side frames 10, 10 are formed in a closed cross-sectional shape of a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The outer side walls 12 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The inner side walls 13 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The bottom walls (lower walls) 14 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The upper walls (not shown) of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. Figure 2 Also, as shown in FIG. 1, a pair of rear side frames 10, 10 are provided at positions inward of the rear side frames 10, 10 in the vehicle width direction. The rear side frames 10, 10 extend in the front-rear direction of the vehicle body 1. The rear side frames 10, 10 are formed in a closed cross-sectional shape of a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The outer side walls 12 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The inner side walls 13 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The bottom walls (lower walls) 14 of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction. The upper walls (not shown) of the rear side frames 10, 10 are formed in a substantially rectangular shape (substantially H-shaped) in the longitudinal direction viewed in the front-rear direction.

[0079] A sub frame 5 (see FIG. 2) that supports suspension members is provided below the rear floor panel 3, and a sub frame fastening portion 60 that fastens the sub frame 5 is provided in the rear side frame 10. Figure 6 is a view showing the sub frame fastening portion, Figures 3 to 5 is a view showing the sub frame fastening portion,Figure 3 is Figure 2 a partial enlarged view of the A portion of Figure 4 and Figure 5 is a perspective view showing the sub-frame fastening portion. Also, Figure 6 is a view of the floor portion of the rear portion of the vehicle body viewed from the side, Figure 7 is a view showing a cross section of the sub-frame fastening portion, and is a view showing Figure 3 a B-B cross-sectional view.

[0080] The sub-frame fastening portion 60 is provided at a position alongside the rear-side connecting portion 41 of the rear side frame 10 in the front-rear direction in which the rear cross member 40 is connected, and is provided as a protruding portion in which the lower wall 14 of the rear side frame 10 is protruded downward. The sub-frame fastening portion 60 is configured to include a first connecting member 61 that connects the inner side wall 13 of the rear side frame 10 and the rear floor panel 3, and a second connecting member 62 that is disposed so as to straddle the lower wall 14 of the rear side frame 10 and the first connecting member 61. Also, Figure 4 , the second connecting member 62 of the sub-frame fastening portion 60 and the rear floor panel 3 are omitted. The first connecting member 61 is installed so as to cover the rear-side connecting portion 41 in which the rear side frame 10 and the rear cross member 40 are connected from the lower surface side thereof, is joined to the lower wall 14 and the inner side wall 13 of the rear side frame 10 by welding, and is joined to the lower surface of the rear floor panel 3 by welding. Also, as shown in Figure 3 , the first connecting member 61 is tapered so that the width dimension in the front-rear direction thereof gradually decreases toward the inner side in the vehicle width direction from the rear side frame 10, and the inner side in the vehicle width direction extends along the longitudinal direction of the rear cross member 40. Also, the first connecting member 61 has a ridge-shaped first ridge line 61a that extends along the longitudinal direction of the rear cross member 40 toward the inner side in the vehicle width direction from the rear side frame 10.

[0081] The second connecting member 62 is installed so as to cover the lower wall 14 of the rear side frame 10 and the first connecting member 61 from the lower surface side thereof, is joined to the lower wall 14 and the outer side wall 12 of the rear side frame 10 by welding, and is joined to the lower surface side of the first connecting member 61 by welding. The second connecting member 62 is tapered so that the width dimension in the front-rear direction thereof gradually decreases toward the inner side in the vehicle width direction from the rear side frame 10, and the inner side in the vehicle width direction extends along the longitudinal direction of the rear cross member 40, as shown in Figure 6 . The cross section of the second connecting member 62 is formed in a protrusion shape that protrudes downward from the lower wall 14 of the rear side frame 10, and the lower end surface of the second connecting member 62 is a flat sub-frame fastening surface 62b that fastens the sub-frame 5. Also, as shown in Figures 4 to 7As shown, a cylindrical boss member 70 extending axially in the vertical direction is provided between the lower wall 14 of the rear frame 10 and the subframe fastening surface 62b of the second connecting structural member 62. The boss member 70 extends from the subframe fastening surface 62b through the lower wall 14 of the rear frame 10 and the stiffening rod 15 provided in the rear frame 10 to its upper side. In the boss member 70, a welded portion 16 provided on the outer periphery near the upper end (not shown) is joined to the stiffening rod 15 by fusion welding (Metal-Inert Gas (MIG) welding). On the other hand, the joint between the lower end (not shown) of the boss member 70 and the subframe fastening surface 62b is not fused. An opening 62c is provided on the subframe fastening surface 62b, through which the subframe 5 is securely fixed to the boss member 70.

[0082] Moreover, such as Figures 3 to 5 As shown, the second connecting structural member 62 also has a shape in which its width gradually decreases in the longitudinal direction from the rear frame 10 toward the inner side in the vehicle width direction, and the inner side in the vehicle width direction extends along the long side of the rear crossbeam 40. Moreover, the second connecting structural member 62 has a ridge-shaped second ridge line 62a extending along the vehicle width direction, and the second ridge line 62a also extends from the rear frame 10 toward the inner side in the vehicle width direction along the long side of the rear crossbeam 40. Therefore, the second ridge line 62a extends from the subframe fastening surface 62b along the vehicle width direction to the rear floor panel 3, and the first ridge line 61a of the first connecting structural member 61 and the second ridge line 62a of the second connecting structural member 62 are arranged in a continuous manner.

[0083] Moreover, such as Figure 2 As shown, the reinforcing frame 80, which is attached to the rear crossbeam 40, is located on the inside side in the vehicle width direction, which is closer to the subframe fastener 60.

[0084] The rear structure of the vehicle body in this embodiment includes: a rear floor panel 3, a floor portion 2 constituting the rear of the vehicle body 1; a rear side frame 10 extending along the longitudinal direction of the vehicle body 1 on the outer side of the rear floor panel 3 in the vehicle width direction; and a subframe 5, which is disposed below the rear floor panel 3 to support the suspension components. Furthermore, the rear side frame 10 includes a subframe fastening portion 60 for fastening the subframe 5, the subframe fastening portion 60 connecting the rear side frame 10 and the rear floor panel 3.

[0085] According to the rear structure of the vehicle body 1 in this embodiment, the subframe fastening part 60 of the rear side frame 10 connects the rear side frame 10 and the rear floor panel 3. Therefore, the load input from the subframe 5 to the rear side frame 10 can be distributed to both the rear side frame 10 and the rear floor panel 3 via the subframe fastening part 60. This effectively improves the connection strength of the subframe 5, thereby ensuring the required strength of the rear of the vehicle body 1.

[0086] Further, in the present embodiment, a rear wheel house 50 is arranged on the outer side of the rear side frame 10 in the vehicle width direction, and a rear cross member 40 extends from the rear wheel house 50 toward the inner side in the vehicle width direction on the upper surface side of the rear floor panel 3, and the sub frame fastening portion 60 is joined to the rear cross member 40 via the rear floor panel 3.

[0087] According to the above structure, by joining the sub frame fastening portion 60 to the rear cross member 40 extending from the rear wheel house 50 toward the inner side in the vehicle width direction, it is possible to disperse the load input from the sub frame 5 also to the rear cross member 40, and thus it is possible to further improve the connection strength of the sub frame 5.

[0088] Further, in the present embodiment, the sub frame fastening portion 60 includes a first link member 61 that links the inner side wall 13 of the rear side frame 10 and the rear floor panel 3.

[0089] According to the above structure, by including the first link member 61 that links the rear side frame 10 and the rear floor panel 3, it is possible to disperse the load input from the sub frame 5 to the rear side frame 10 to the rear cross member 40 and the rear floor panel 3 via the first link member 61. Thus, with respect to the load toward the inner side in the vehicle width direction with respect to the rear side frame 10, it is possible to suppress displacement of the rear side frame 10 toward the same direction (tilting toward the inner side in the vehicle width direction), and thus it is possible to effectively improve the connection strength of the sub frame 5.

[0090] Further, in the present embodiment, the sub frame fastening portion 60 includes a second link member 62 that is arranged so as to straddle the lower wall (lower side wall portion) 14 of the rear side frame 10 and the first link member 61.

[0091] According to the above structure, by including the second link member 62 that is arranged so as to straddle the lower wall 14 of the rear side frame 10 and the first link member 61, it is possible to disperse the load input from the sub frame 5 to the first link member 61 and the rear side frame 10 via the second link member 62, and thus it is possible to further improve the connection strength of the sub frame 5.

[0092] Further, in the present embodiment, the first link member 61 is linked to the inner side wall 13 and the lower wall 14 of the rear side frame 10, and has a shape in which the width dimension in the front-rear direction becomes smaller as it goes toward the inner side in the vehicle width direction from the rear side frame 10.

[0093] According to the structure, the first link member 61 is a shape in which the width dimension in the front-rear direction gradually decreases toward the inner side in the vehicle width direction, and is further joined to the inner side wall 13 and the lower wall 14 of the rear side frame 10, whereby the load input from the sub frame 5 can be dispersed, and the load input to the first link member 61 from the rear side frame 10 can be more efficiently transmitted to the rear cross member 40 or the rear floor panel 3. Therefore, with respect to the load toward the inner side in the vehicle width direction with respect to the rear side frame 10, the displacement of the rear side frame 10 toward the same direction (tilting toward the inner side in the vehicle width direction) can be more effectively suppressed, and thus the connection strength of the sub frame 5 can be more effectively improved.

[0094] Further, in the present embodiment, the second link member 62 is joined to the first link member 61, and is joined to the lower wall 14 and the outer side wall 12 of the rear side frame 10.

[0095] According to the structure, by joining the second link member 62 to the first link member 61, and joining the lower wall 14 and the outer side wall 12 of the rear side frame 10, the load input to the second link member 62 from the sub frame 5 can be dispersed to the first link member 61 and the rear side frame 10, and the connection strength of the sub frame 5 can be further improved.

[0096] Further, in the present embodiment, a first ridge line 61a is provided to the first link member 61, and a second ridge line 62a is provided to the second link member 62, and the first ridge line 61a and the second ridge line 62a are arranged in a continuous manner with respect to each other.

[0097] According to the structure, the second ridge line 62a of the second link member 62, which extends from the sub frame fastening surface 62b to the rear floor panel 3, is arranged in a continuous manner with the first ridge line 61a of the first link member 61, whereby the load input from the sub frame 5 can be smoothly transmitted to the first link member 61 and the rear cross member 40, and thus the connection strength of the sub frame 5 can be further improved.

[0098] Further, in the present embodiment, a reinforcement frame 80 is provided at a position further inward in the vehicle width direction than the sub frame fastening portion 60, and the reinforcement frame 80 extends in the front-rear direction of the vehicle body 1 and intersects the rear cross member 40.

[0099] According to the structure, the reinforcement frame 80 is provided at a position further inward in the vehicle width direction than the sub frame fastening portion 60, and the reinforcement frame 80 extends in the front-rear direction of the vehicle body and intersects the rear cross member 40, and thus the load input to the rear cross member 40 from the sub frame 5 can be transmitted to the reinforcement frame 80, and thus the connection strength of the sub frame 5 can be further improved.

[0100] The above describes embodiments of the present application, but the present application is not limited to the embodiments described above, and various changes can be made within the scope of the technical idea recited in the claims and the description and drawings.

Claims

1. A rear structure of a vehicle body, characterized by comprising: including: a floor panel constituting a floor portion of a rear portion of a vehicle body; a rear side frame extending in a front-rear direction of the vehicle body at an outer side in a vehicle width direction in the floor panel; and a sub frame provided below the floor panel to support a suspension member, the rear side frame includes a sub frame fastening portion fastening the sub frame, the sub frame fastening portion links the rear side frame and directly links the floor panel. including:

2. The rear structure of a vehicle body according to claim 1, characterized by a wheel house provided at an outer side of the rear side frame in the vehicle width direction; and a cross member extending from the wheel house toward an inner side in the vehicle width direction on an upper surface side of the floor panel, the sub frame fastening portion is joined to the cross member via the floor panel.

3. The rear portion structure of a vehicle body according to claim 2, wherein the sub frame fastening portion includes a first link member linking a wall portion at an inner side in the vehicle width direction of the rear side frame and the floor panel.

4. The rear portion structure of a vehicle body according to claim 3, wherein the sub frame fastening portion includes a second link member provided in a manner straddling a wall portion at a lower side of the rear side frame and the first link member.

5. The rear portion structure of a vehicle body according to claim 4, wherein the first link member links the wall portion at the inner side and the wall portion at the lower side of the rear side frame, and the first link member is in a shape in which a front-rear direction width dimension becomes smaller as it goes from the rear side frame toward the inner side in the vehicle width direction.

6. The rear portion structure of a vehicle body according to claim 4, wherein the second link member links the first link member and links the wall portion at the lower side and a wall portion at an outer side in the vehicle width direction of the rear side frame. including: a first ridge line provided in the first link member; and 7. The rear structure of a vehicle body according to claim 4, characterized by a second ridge line provided in the second link member, extending from a sub frame fastening surface in the sub frame fastening portion to the floor panel, the first ridge line and the second ridge line are disposed in a manner continuous with each other. including: a reinforcement frame located at an inner side in the vehicle width direction than the sub frame fastening portion, the reinforcement frame extends in the front-rear direction of the vehicle body and intersects the cross member.

8. The rear structure of a vehicle body according to claim 2, characterized by including: a floor panel constituting a floor portion of a rear portion of a vehicle body; a rear side frame extending in a front-rear direction of the vehicle body at an outer side in a vehicle width direction in the floor panel; and 9. A rear structure of a vehicle body, characterized by comprising: a sub frame provided below the floor panel to support a suspension member, the rear side frame includes a sub frame fastening portion fastening the sub frame, the sub frame fastening portion links the rear side frame and the floor panel, the sub frame fastening portion includes a first link member linking a wall portion at an inner side in the vehicle width direction of the rear side frame and the floor panel, the sub frame fastening portion includes a second link member provided in a manner straddling a wall portion at a lower side of the rear side frame and the first link member. ​ ​ ​ ​

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