Rear body structure

Abstract

A vehicle rear body structure capable of reducing manufacturing costs. [Solution] A rear body structure including a side sill 20 and a rear frame 40, in which, as shown in Figure 6(a), the tip of the frame floor portion 49 is placed on the inner protrusion portion 27 as shown by arrow (1), and the frame roof portion 48 is placed over the inner roof portion 25 as shown by arrow (2), and in this configuration, the rear frame 40 is fixed to the side sill 20 by rivets 65 or the like as shown in Figure 6(b).

Description

[Technical field]

[0001] The present invention relates to a rear vehicle body structure including a side sill and a rear frame. [Background technology]

[0002] Various vehicle rear body structures including side sills and a rear frame have been proposed (for example, see Patent Document 1 (FIG. 3)).

[0003] Patent Document 1 will be explained with reference to the following figure. FIG. 12 is a cross-sectional view of a main part of a conventional vehicle rear body structure. In this vehicle rear structure, a rear frame 104 is fitted onto a side sill 101 consisting of a side sill outer 102 and a side sill inner 103 from the inside of the vehicle body, and the two components are joined at a joint portion 105. The rear frame 104 is a casting that is thicker than the side sill 101 .

[0004] The joining process of the side sill 101 and the rear frame 104 will be considered. When the side sill 101 is stationary, the rear frame 104 moves horizontally. In addition, the center of the side sill 101 in the height direction is aligned with the center of the rear frame 104 in the height direction.

[0005] That is, in the conventional vehicle rear body structure, the rear frame 104 needs to be raised and lowered while moving horizontally relative to the side sill 101. It is not easy to move the rear frame 104 horizontally while engaging the parts. This increases the manufacturing costs of the rear body structure.

[0006] However, there is a demand to provide vehicles at low cost, and as part of this demand, there is a demand to reduce the manufacturing costs of the rear body structure. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 7074039 Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a vehicle rear body structure that can reduce manufacturing costs. [Means for solving the problem]

[0009] The invention according to claim 1 is a vehicle rear structure including a side sill and a rear frame extending rearward from the side sill, The side sill includes a side sill outer disposed on the outside of the vehicle body, and a side sill inner disposed on the inside of the vehicle body with respect to the side sill outer, The side sill inner includes an inner wall portion extending vertically, an inner roof portion extending from an upper end of the inner wall portion to the outside of the vehicle body, an inner flange portion extending upward from a tip of the inner roof portion, and an inner protruding portion protruding laterally toward the inside of the vehicle body from a midpoint in the height direction of the inner wall portion, a front portion of the rear frame includes a frame wall portion extending vertically so as to present a U-shaped cross section, a frame roof portion extending from an upper end of the frame wall portion to an outside of the vehicle body, and a frame floor portion extending from a lower end of the frame wall portion to the outside of the vehicle body, The tip of the frame floor portion is placed on the inner overhang portion, and the frame roof portion is placed over the inner roof portion, In this embodiment, the front portion of the rear frame is fixed to the side sill. Effect of the Invention

[0010] In the invention according to claim 1, the tip end of the frame floor section is placed on the inner overhanging section, and the frame roof section is placed over the inner roof section. In other words, the rear frame can be fixed to the stationary side sill simply by lowering the rear frame from above onto the stationary side sill. Horizontal movement of the rear frame is not required; it only needs to move from top to bottom. It is easy to move the rear frame downward, which reduces the manufacturing costs of the rear body structure. [Brief description of the drawings]

[0011] [Figure 1] 1 is a side view of a vehicle rear structure according to the present invention. [Diagram 2] FIG. 2 is a view taken along the arrow 2 in FIG. [Diagram 3] 1A is a side view of the rear frame, (b) is a cross-sectional view taken along line bb in (a), and (c) is a cross-sectional view taken along line cc in (a). [Figure 4] 3(b), (b) is an enlarged view of part b in (a), and (c) is a diagram showing a modified example of the center of the rear frame. [Diagram 5] (a) is an exploded view of the side sill, and (b) is a cross-sectional view of the side sill. [Figure 6] 6(a) is a diagram for explaining the procedure for joining the rear frame to the side sill, (b) is a cross-sectional view taken along line 6b-6b in FIG. 2, (c) is an enlarged view of part c in (b), and (d) is an enlarged view of part d in (b). [Figure 7] 1A is an exploded view of a front end connecting member, and FIG. 1B is a cross-sectional view of the front end connecting member. [Figure 8] 8A is a diagram for explaining the procedure for joining the rear frame to the side sill and the procedure for joining the front end connecting member to the rear frame, (b) is a cross-sectional view taken along line 8b-8b in FIG. 2, (c) is an enlarged view of part c in (b), (d) is an enlarged view of part d in (b), and (e) is an enlarged view of part e in (b). [Figure 9] 13(a) and 13(b) are diagrams for explaining the height position of the inner protruding portion. [Figure 10] 13(a) and 13(b) are diagrams illustrating modified examples of the inner protruding portion. [Figure 11]13(a) and 13(b) are diagrams explaining the function of the center of the rear frame. [Figure 12] FIG. 11 is a cross-sectional view of a main portion of a conventional vehicle rear body structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] An embodiment of the present invention will be described below with reference to the accompanying drawings. In the drawings, front, rear, top, bottom, inside and outside of the vehicle body are defined with reference to a driver riding in the vehicle. EXAMPLES

[0013] [Rear body structure] As shown in FIG. 1, the vehicle rear structure 10 includes a side sill 20, a rear frame 40 extending rearward from the side sill 20, and a rear wheel house 12 disposed outside the rear frame 40.

[0014] In addition, as shown in Figure 2, the rear body structure 10 includes a floor cross member 14 that is disposed in front of the rear frame 40 and extends from the side sill 20 toward the inside of the vehicle body, and a front end connecting member 60 that connects the front end of the rear frame 40 and the floor cross member 14. Note that the floor panel is omitted in Figure 2.

[0015] [Rear frame] 3(a), the rear frame 40 is a long member extending in the front-rear direction. Preferably, the rear frame 40 is a die-cast product made of an aluminum alloy. The aluminum alloy is a light alloy and can reduce the weight of the rear frame 40. However, in order to further reduce the weight, the first groove 41 and the second groove 42 are hollowed out.

[0016] By providing the first groove 41 and the second groove 42, the weight can be further reduced, but the strength decreases. Therefore, preferably, the first groove 41 is provided with a plurality of (two in this example) I-shaped ribs 43 extending vertically, and the second groove 42 is provided with a plurality of (six in this example) I-shaped ribs 43 extending vertically. The upper part of the first groove 41 and the second groove 42 constitutes a frame flange portion 44 . Also shown in dashed lines is an inner rib-like flange 45 between the first groove 41 and the second groove 42 and below the second groove 42 .

[0017] The rear frame 40 shown in Fig. 3(a) is offset in the front-rear direction of the drawing, so the cross section differs depending on the location in the front-rear direction of the vehicle body. Therefore, the cross section at the front will be explained based on Fig. 3(b), and the cross section at the center will be explained based on Fig. 3(c).

[0018] [Cross section of the front part of the rear frame] As shown in Figure 3(b), the front portion of the rear frame 40 comprises a frame wall portion 47 extending vertically, a frame roof portion 48 extending from the upper end of the frame wall portion 47 to the outside of the vehicle body, a frame flange portion 44 extending upward from the tip of the frame roof portion 48, and a frame floor portion 49 extending from the lower end of the frame wall portion 47 to the outside of the vehicle body, presenting a U-shaped cross section with the opening gradually widening outward. The first groove 41 is reinforced by an I-shaped rib (43 in FIG. 3(a)) that crosses the U-shaped cross section.

[0019] Preferably, the rear frame 40 further includes an inner rib-like flange 45 that protrudes laterally toward the inside of the vehicle body from the upper end of the frame wall portion 47. Details of the inner rib-like flange 45 will be described later with reference to Fig. 4(a).

[0020] [Cross section of the center of the rear frame] 3(c), the center of the rear frame 40 comprises a frame wall portion 47 extending vertically, a frame roof portion 48 extending from the upper end of the frame wall portion 47 to the outside of the vehicle body, a frame flange portion 44 extending upward from the tip of the frame roof portion 48, and a frame floor portion 49 extending from the lower end of the frame wall portion 47 to the outside of the vehicle body. Preferably, the rear frame 40 further comprises an inner rib-like flange 45 protruding laterally from the lower end of the frame wall portion 47 to the inside of the vehicle body. The second groove 42 is reinforced by an I-shaped rib 43 that crosses the U-shaped cross section.

[0021] [Inner ribbed flange] 4(a), the inner rib-like flange 45 has a base thickness t1 that is set to be approximately equal to a thickness t2 of the frame wall portion 47. The inner rib-like flange 45 is a tapered rib whose thickness decreases toward its tip due to a draft angle during casting. The pointed tapered rib may have a protruding tip, but is preferably round with a radius R as shown in Fig. 4(b) . By making the tip round, chipping of the tip can be prevented.

[0022] The inner rib-like flange 45 is a tapered rib with a pointed tip, so that an increase in weight can be suppressed. In addition, since the inner rib is a tapered rib, the draft angle during casting is ensured, and the inner rib-like flange 45 can be extremely easily separated from the casting mold.

[0023] [Inner ribbed flange position] 4(c), the inner rib-like flange 45 may protrude toward the inside of the vehicle body from the middle of the height direction of the frame wall portion 47. Therefore, the inner rib-like flange 45 can protrude from any point of the frame wall portion 47.

[0024] [Side sill] Next, the structure of the side sill 20 will be described with reference to FIGS. 5(a), the side sill 20 is composed of a side sill outer 21 arranged on the outside of the vehicle body, a reinforcing member 22 arranged on the inside of the vehicle body from the side sill outer 21, and a side sill inner 23 arranged on the inside of the vehicle body from the reinforcing member 22. Note that the reinforcing member 22 is not a required member since it is provided as needed.

[0025] The side sill outer 21, the reinforcing member 22, and the side sill inner 23 are preferably press-formed products made of steel plate. Press-formed products are also called pressed parts.

[0026] [Side sill inner] The side sill inner 23 comprises an inner wall portion 24 extending vertically, an inner roof portion 25 extending from the upper end of the inner wall portion 24 to the outside of the vehicle body, an inner flange portion 26 extending upward from the tip of the inner roof portion 25, an inner protrusion portion 27 protruding laterally toward the inside of the vehicle body from midway along the height of the inner wall portion 24, and an inner floor portion 28 extending from the lower end of the inner wall portion 24 to the outside of the vehicle body.

[0027] 5(a), the inner protruding portion 27 is, for example, a cut-and-raised piece 32 obtained by making a cut 31 in the inner wall portion 24 and bending it by about 90° as shown by the arrow. The cut-and-raised piece 32 is formed simultaneously during the pressing process.

[0028] As shown in FIG. 5(b), the side sill outer 21, the reinforcing member 22 and the side sill inner 23 are stacked side by side and joined together by a nugget 33 by spot welding or the like, thereby obtaining the side sill 20.

[0029] [Effect of cut pieces] An opening 34 corresponding to the size of the cut-and-raised piece 32 is formed in the inner wall portion 24. This opening 34 serves as a passage for paint when electrodeposition coating is applied to the side sill 20. Because the opening 34 is sufficiently large, a sufficient amount of paint flows in and out of the opening 34. As a result, electrodeposition coating of the side sill 20 is performed well, and the rust-preventing performance of the side sill 20 is improved.

[0030] [Method of joining the rear body structure at a portion not including the front end connecting member 60] A method for joining the side sill 20 and the rear frame 40 in the cross section taken along line 6b-6b in FIG. 2 will be described with reference to FIGS. 6(a) to 6(d).

[0031] As shown in FIG. 6(a), first, the rear frame 40 is moved downward relative to the stationary side sill 20. In detail, the tip of the frame floor portion 49 is placed on the inner protrusion portion 27 as shown by the arrow (1), the frame roof portion 48 is placed on top of the inner roof portion 25 as shown by the arrow (2), and the frame flange portion 44 is attached to the inner flange portion 26.

[0032] Then, as shown in FIG. 6(b), the joint portions are joined by at least one of mechanical fastening, fusion welding, and adhesion (in this example, rivets 65). The mechanical fastening may be achieved by means of rivets 65, bolts or screws. In addition, the fusion welding may be performed by friction stir welding, spot welding, laser welding, or the like. The adhesive is preferably a one-component adhesive or a two-component adhesive.

[0033] As shown in FIG. 6(c), the side sill outer 21, the reinforcing member 22, the inner flange portion 26 of the side sill inner 23, and the frame flange portion 44 may be joined together by rivets 65, for example. As shown in FIG. 6(d), the inner protruding portion 27 and the frame floor portion 49 may be joined by a rivet 65, for example.

[0034] [Front end connecting member] The front end connecting member 60 shown in FIG. 2 will be described in detail with reference to FIGS. 7(a) and (b). As shown in FIG. 7( a ), the front end connecting member 60 is made up of a connecting portion floor portion 61 , a connecting portion wall portion 62 rising from one end of the connecting portion floor portion 61 , and a connecting portion roof portion 63 . Preferably, a steel plate is press-formed into an L-shaped cross section to integrally form the connecting portion floor portion 61 and the rising connecting portion wall portion 62. Also, a steel plate is press-formed into an I-shaped cross section to obtain the connecting portion roof portion 63.

[0035] 7(b), the connecting portion roof portion 63 is placed on the connecting portion wall portion 62 to form a substantially U-shaped cross section, but the two are not yet joined together.

[0036] [Method of joining the rear body structure at the portion including the front end connecting member 60] A method of joining the side sill 20, the rear frame 40 and the front end connecting member 60 in the cross section taken along line 8b-8b in FIG. 2 will be described with reference to FIGS. 8(a) to (e). As shown in FIG. 8(a), first, the connecting portion floor portion 61 and the connecting portion wall portion 62 are raised relative to the stationary side sill 20, and the connecting portion floor portion 61 is brought into contact with the inner protruding portion 27 (arrow (3)).

[0037] Next, the rear frame 40 is moved from top to bottom. More specifically, the tip of the frame floor 49 is placed on the inner overhang 27 as shown by arrow (4), the frame roof 48 is placed over the inner roof 25 as shown by arrow (5), and the frame flange 44 is affixed to the inner flange 26. At the same time, the inner rib-like flange 45 is placed on the upper end of the connecting portion wall 62 (arrow (6)).

[0038] That is, the rear frame 40 is moved from top to bottom onto the connecting portion floor portion 61 and the connecting portion wall portion 62, which have an L-shaped cross section with an open upper surface.

[0039] Next, the connecting portion roof portion 63 is placed on the frame roof portion 48 as shown by the arrow (7), and one end of the connecting portion roof portion 63 is placed on the inner rib-like flange 45 as shown by the arrow (8). Then, as shown in FIG. 8(b), the joint portions are joined by at least one of mechanical fastening, fusion welding, and adhesion.

[0040] As shown in FIG. 8(c), the side sill outer 21, the reinforcing member 22, the inner flange portion 26 of the side sill inner 23, and the frame flange portion 44 are joined together by rivets 65, for example. As shown in FIG. 8(d), the inner protruding portion 27, the frame floor portion 49, and the connecting portion floor portion 61 are joined together by rivets 65, for example. As shown in FIG. 8(e), the inner rib-like flange 45, the connecting portion wall portion 62, and the connecting portion roof portion 63 are joined together by rivets 65, for example.

[0041] 8(b), the connecting portion floor portion 61 is shaped to follow the frame floor portion 49, the connecting portion wall portion 62 is shaped to follow the frame wall portion 47, and the connecting portion roof portion 63 is shaped to follow the frame roof portion 48. Therefore, the front end connecting member 60 can surround the front end portion of the rear frame 40.

[0042] [Height position of inner extension part] As shown in FIG. 9(a), an inner protruding portion 27 is provided at the middle position in the height direction of the inner wall portion 24 in correspondence with the rear frame 40 having a height dimension H1. As shown in FIG. 9(b), for a rear frame 40 in which the height dimension H2 is greater than the height dimension H1, an inner protruding portion 27 is provided at a lower position in the height direction of the inner wall portion 24.

[0043] In other words, the inner protrusion 27 can protrude from the middle of the height direction of the inner wall portion 24 at any height, and as a result, the height dimension of the rear frame 40 can be freely selected, thereby increasing the freedom in designing the rear frame 40.

[0044] [Example of inner extension modification] 10(a), the inner overhang 27 may be a bracket 36 that is separate (a separate part) from the inner wall 24. The bracket 36 is preferably an angle (iron angle), but may also be a horizontally extending strip (I-section steel plate).

[0045] As shown in FIG. 10(b), the bracket 36 is joined to the inner wall 24 by mechanical bonding, fusion welding or adhesive. The height position of the bracket 36 can be set arbitrarily. That is, the same effects as those in Figures 9(a) and (b) can be obtained.

[0046] [Function of the center of the rear frame] As shown in Figure 11(a), the centre of the rear frame 40 comprises a frame wall portion 47 extending vertically, a frame roof portion 48 extending from the upper end of the frame wall portion 47 to the outside of the vehicle body, a frame flange portion 44 extending upward from the tip of the frame roof portion 48, a frame floor portion 49 extending from the lower end of the frame wall portion 47 to the outside of the vehicle body, and an inner rib-like flange 45 protruding laterally from the lower end of the frame wall portion 47 to the inside of the vehicle body. Then, the rear wheel house 12 is moved laterally from the outside to the inside of the vehicle body so that it abuts against the frame flange portion 44. Also, the floor panel 16 is placed on the inner rib-like flange 45 by moving it from top to bottom.

[0047] As shown in FIG. 11( b ), the rear wheel house 12 is joined to the frame flange portion 44 with, for example, rivets 65 , and the floor panel 16 is joined to the inner rib-like flange 45 with, for example, rivets 65 .

[0048] Based on the above, the present invention can be summarized as follows. As shown in FIG. 1, a vehicle rear structure 10 includes a side sill 20 and a rear frame 40 extending rearward from the side sill 20. As shown in FIG. 5(a), the side sill 20 includes a side sill outer 21 arranged on the outside of the vehicle body, and a side sill inner 23 arranged on the inside of the vehicle body with respect to the side sill outer 21. The side sill inner 23 includes an inner wall portion 24 extending vertically, an inner roof portion 25 extending from the upper end of the inner wall portion 24 to the outside of the vehicle body, an inner flange portion 26 extending upward from the tip of the inner roof portion 25, and an inner protruding portion 27 protruding laterally toward the inside of the vehicle body from the middle of the height direction of the inner wall portion 24, As shown in FIG. 3(b), the front portion of the rear frame 40 includes a frame wall portion 47 extending vertically so as to present a U-shaped cross section, a frame roof portion 48 extending from an upper end of the frame wall portion 47 to the outside of the vehicle body, and a frame floor portion 49 extending from a lower end of the frame wall portion 47 to the outside of the vehicle body. As shown in FIG. 6(a), the tip of the frame floor portion 49 is placed on the inner overhanging portion 27, and the frame roof portion 48 is placed over the inner roof portion 25. As shown in FIG. 2, in this configuration, the front portion of the rear frame 40 is fixed to the side sill 20.

[0049] As shown in Fig. 6(a), the rear frame 40 is set simply by moving it from top to bottom onto the side sill inner 23. Since no lateral movement is required, manufacturing is simplified and manufacturing costs can be reduced.

[0050] Preferably, the rear frame 40 further includes an inner rib-like flange 45 that protrudes laterally toward the inside of the vehicle body from an upper end of the frame wall portion 47 as shown in Fig. 3(b). Alternatively, the rear frame 40 further includes an inner rib-like flange 45 that protrudes laterally toward the inside of the vehicle body from a midpoint in the height direction of the frame wall portion 47 as shown in Fig. 4(c).

[0051] The strength of the rear frame 40 can be increased by the reinforcing effect of the inner rib-like flange 45. By changing the height position of the inner rib-like flange 45, the distribution characteristics of the load during a collision can be changed. Furthermore, when the front end connecting member 60 is provided, a portion of the front end connecting member 60 can be joined to the inner rib-like flange 45, making it easy to attach the front end connecting member 60.

[0052] Preferably, as shown in FIGS. 10(a) and 10(b), the inner protruding portion 27 is a bracket 36 that is separate from the inner wall portion 24.

[0053] Bracket 36 may have any cross-sectional shape, such as an L-section or a transverse I-section. Because the bracket 36 is a separate body, it is possible to attach the bracket 36 to the inner wall portion 24 at any desired height. As a result, the degree of freedom in designing the rear frame 40 is increased.

[0054] Preferably, as shown in Figs. 5(a) and (b), the inner protruding portion 27 is a cut-and-raised piece 32 formed by making a cut 31 in the inner wall portion 24 and bending it.

[0055] Since the inner protrusion 27 is formed integrally with the inner wall portion 24, there is no need to prepare a separate part. The inner protrusion 27 can be provided at any height on the inner wall 24. As a result, the degree of freedom in designing the rear frame 40 is increased. Furthermore, an opening 34 is formed in the inner wall portion 24 by cutting and raising. This opening 34 is used as an inlet and outlet for paint during electrodeposition coating.

[0056] Preferably, as shown in FIG. 2, the vehicle rear structure 10 further includes a floor cross member 14 that is perpendicular to the side sill inner 23 and extends toward the inside of the vehicle body, and a front end connecting member 60 that connects the rear frame 40 and the floor cross member 14, As shown in FIG. 8(b), the front end connecting member 60 includes a connecting portion floor portion 61 that is aligned with the frame floor portion 49, a connecting portion wall portion 62 that is aligned with the frame wall portion 47, and a connecting portion roof portion 63 that is aligned with the frame roof portion 48. The front end connecting member 60 surrounds the front end of the rear frame 40 .

[0057] 2, the front end connecting member 60 connects the rear frame 40 and the floor cross member 14, thereby increasing the strength of the vehicle rear structure 10 against a collision from behind. The front end connecting member 60 firmly fixes the front part of the rear frame 40, which is a die-cast product, to the side sill inner 23 and the floor cross member 14, which are pressed steel plate products. Furthermore, as shown in FIG. 8(a), the front end connecting member 60 can be assembled by moving the rear frame 40 downward, which makes it easier to assemble the rear frame 40 and the front end connecting member 60.

[0058] Preferably, as shown in FIG. 11(a), the vehicle rear structure 10 further includes a rear wheel house 12 and a floor panel 16. The center of the rear frame 40 is provided with a frame wall portion 47 extending vertically, a frame roof portion 48 extending from the upper end of the frame wall portion 47 to the outside of the vehicle body, a frame flange portion 44 extending upward from the tip of the frame roof portion 48, a frame floor portion 49 extending from the lower end of the frame wall portion 47 to the outside of the vehicle body, and an inner rib-like flange 45 protruding laterally from the lower end of the frame wall portion 47 to the inside of the vehicle body, As shown in FIG. 11( b ), the rear wheel house 12 is joined to the frame flange portion 44 , and the floor panel 16 is joined to the inner rib-like flange 45 .

[0059] The rear wheel house 12 and the rear frame 40 can be assembled in the left-right direction, and the floor panel 16 and the rear frame 40 can be assembled in the up-down direction, which facilitates assembly of the rear part of the vehicle body and improves productivity.

[0060] Preferably, the rear frame 40 is a die-cast product of an aluminum alloy, and the front end connecting member 60 is a press-formed product of a steel plate. As shown in FIG. 2, the rear frame 40 and the front end connecting member 60 are joined by at least one of mechanical fastening, fusion welding, and adhesion (by rivets 65 in this embodiment).

[0061] It is possible to join dissimilar materials, such as aluminum alloy and steel plate.

[0062] Preferably, as shown in Figs. 3(a) and 3(c), the rear frame 40 includes a plurality of I-shaped ribs 43 that cross the U-shaped cross section.

[0063] It is possible to increase the strength and rigidity of the rear body while suppressing an increase in the weight of the rear frame 40. It is possible to absorb impact energy in the event of a rear-end collision.

[0064] Preferably, as shown in FIGS. 3(a) to 3(c), the rear frame 40 includes an inner rib-like flange 45 that protrudes laterally from the frame wall portion 47 toward the inside of the vehicle body, As shown in FIG. 4( a ), the inner rib-like flange 45 is a tapered rib with a pointed tip, and the thickness t 1 of the base of the tapered rib is set to be substantially equal to the thickness t 2 of the frame wall portion 47 .

[0065] Providing the inner rib-like flange 45 can increase the strength and rigidity of the rear frame 40. Providing this inner rib-like flange 45 over the entire length of the rear frame 40 can reduce the weight of the rear frame 40 while maintaining or improving the strength and rigidity of the rear frame 40.

[0066] As described with reference to FIGS. 4(a) and 4(c), the inner rib-like flange 45 can be provided at any height position on the frame wall portion 47. 11(b) is changed, the height position of the inner rib-like flange 45 can be easily changed to the height position of the floor panel 16. As a result, the freedom of design of the floor panel 16 is increased.

[0067] Furthermore, since the inner rib-like flange 45 is formed as a tapered rib with a pointed tip, a draft angle is ensured, which facilitates demolding after casting and increases the productivity of the cast rear frame. [Industrial Applicability]

[0068] The present invention is suitable for a vehicle rear body structure equipped with a side sill and a rear frame. [Explanation of symbols]

[0069] 10...rear body structure, 12...rear wheel house, 14...floor cross member, 16...floor panel, 20...side sill, 21...side sill outer, 22...reinforcing member, 23...side sill inner, 24...inner wall portion, 25...inner roof portion, 26...inner flange portion, 27...inner overhang portion, 28...inner floor portion, 31...notch, 32...raised piece, 36...bracket, 40...rear frame, 43...I-shaped rib, 44...frame flange portion, 45...inner rib-shaped flange, 47...frame wall portion, 48...frame roof portion, 49...frame floor portion, 60...front end connecting member, 61...connecting portion floor portion, 62...connecting portion wall portion, 63...connecting portion roof portion.

Claims

1. A vehicle rear structure including a side sill and a rear frame extending rearward from the side sill, The side sill includes a side sill outer disposed on the outside of the vehicle body, and a side sill inner disposed on the inside of the vehicle body with respect to the side sill outer, The side sill inner includes an inner wall portion extending vertically, an inner roof portion extending from an upper end of the inner wall portion to the outside of the vehicle body, an inner flange portion extending upward from a tip of the inner roof portion, and an inner protruding portion protruding laterally toward the inside of the vehicle body from a midpoint in the height direction of the inner wall portion, a front portion of the rear frame includes a frame wall portion extending vertically so as to present a U-shaped cross section, a frame roof portion extending from an upper end of the frame wall portion to an outside of the vehicle body, and a frame floor portion extending from a lower end of the frame wall portion to the outside of the vehicle body, The tip of the frame floor portion is placed on the inner overhang portion, and the frame roof portion is placed over the inner roof portion, In this embodiment, the vehicle rear structure is characterized in that the front portion of the rear frame is fixed to the side sill.

2. 2. The vehicle rear structure according to claim 1, A vehicle rear structure, wherein the rear frame further includes an inner rib-like flange that protrudes laterally toward the inside of the vehicle body from an upper end or a middle portion in the height direction of the frame wall.

3. 2. The vehicle rear structure according to claim 1, A vehicle rear structure, wherein the inner protrusion portion is a bracket separate from the inner wall portion.

4. 2. The vehicle rear structure according to claim 1, A vehicle rear structure, wherein the inner protrusion is a cut-and-raised piece formed by cutting and bending the inner wall portion.

5. 2. The vehicle rear structure according to claim 1, The vehicle rear structure further includes a floor cross member that is perpendicular to the side sill inner and extends toward the inside of the vehicle body, and a front end connecting member that connects the rear frame and the floor cross member, the front end connecting member includes a connecting portion floor portion that is aligned with the frame floor portion, a connecting portion wall portion that is aligned with the frame wall portion, and a connecting portion roof portion that is aligned with the frame roof portion, A vehicle rear structure, wherein the front end connecting member surrounds the front end of the rear frame.

6. 2. The vehicle rear structure according to claim 1, The vehicle rear structure further includes a rear wheel house and a floor panel. a center of the rear frame includes a frame wall portion extending vertically, a frame roof portion extending from an upper end of the frame wall portion to the outside of the vehicle body, a frame flange portion extending upward from a tip of the frame roof portion, a frame floor portion extending from a lower end of the frame wall portion to the outside of the vehicle body, and an inner rib-like flange protruding laterally from the lower end of the frame wall portion to the inside of the vehicle body, a rear wheel house joined to the frame flange portion, and a floor panel joined to the inner rib-shaped flange,

7. 2. The vehicle rear structure according to claim 1, A vehicle rear structure, wherein the rear frame has a plurality of I-shaped ribs that cross the U-shaped cross section.

8. 6. The vehicle rear structure according to claim 5, The rear frame is an aluminum alloy die-cast product, The front end connecting member is a press-formed product of a steel plate, A vehicle rear body structure, characterized in that the rear frame and the front end connecting member are joined by at least one of mechanical fastening, fusion welding, and adhesion.

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