Vehicle body rear structure
By designing a U-shaped cross-section for fixing the rear frame to the protruding part of the lower longitudinal beam, the problem of increased manufacturing costs caused by horizontal movement of the rear frame in existing technologies is solved, achieving the effects of simplified assembly and cost reduction.
Patent Information
- Application Number
- CN202580002459.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-09-04
- Filing Date
- 2025-06-24
- Publication Date
- 2026-05-08
AI Technical Summary
The existing rear structure of the vehicle body requires the horizontal movement of the rear frame to join with the lower longitudinal beam during assembly, which increases manufacturing costs.
Design a rear structure of a vehicle body, wherein the front part of the rear frame has a U-shaped cross section, the frame floor is placed on the inner extension of the lower longitudinal beam, the frame roof covers the inner roof and is fixed by mechanical fastening, welding or bonding, and the rear frame can be fixed to the lower longitudinal beam by simply moving from top to bottom.
The assembly process of the rear frame and lower longitudinal beams has been simplified, reducing manufacturing costs and improving assembly efficiency and productivity.
Smart Images
Figure CN122003356A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a rear body structure comprising a lower longitudinal beam and a rear frame. Background Technology
[0002] Various rear body structures including lower longitudinal beams and rear frames have been proposed (for example, see Patent Document 1). Figure 3 )).
[0003] Based on the figure below, Patent Document 1 will be explained.
[0004] Figure 12 This is a cross-sectional view of the main parts of the existing rear structure of the vehicle body.
[0005] In the rear structure of the vehicle body, the rear frame 104 is embedded from the inside of the vehicle body into the lower longitudinal beam 101, which is composed of the lower longitudinal beam outer component 102 and the lower longitudinal beam inner component 103, and the two components are joined at the joint 105.
[0006] The rear frame 104 is a casting with a wall thickness greater than that of the lower longitudinal beam 101.
[0007] The connection process between the lower longitudinal beam 101 and the rear frame 104 is studied.
[0008] With the lower longitudinal beam 101 stationary, the frame 104 is moved horizontally.
[0009] Furthermore, the center of the rear frame 104 in the height direction is aligned with the center of the lower longitudinal beam 101 in the height direction.
[0010] That is, in the existing rear structure of the vehicle body, it is necessary to make the rear frame 104 move horizontally and rise and fall relative to the lower longitudinal beam 101.
[0011] It is not easy to move the rear frame 104 horizontally while simultaneously fitting the rear frame 104 together.
[0012] Therefore, the manufacturing cost of the rear structure of the vehicle body increases.
[0013] However, the goal is to provide vehicles at low prices, and as part of that, to reduce the manufacturing cost of the rear structure of the vehicle body.
[0014] Existing technical documents
[0015] Patent documents
[0016] Patent Document 1: Japanese Patent No. 7074039 Summary of the Invention
[0017] The problem that the invention aims to solve
[0018] The objective of this invention is to provide a rear structure for a vehicle body that enables a reduction in manufacturing costs.
[0019] Methods for solving problems
[0020] Technical solution 1 discloses a rear structure of a vehicle body, comprising a lower longitudinal beam and a rear frame extending rearward from the lower longitudinal beam toward the rear of the vehicle body. The lower longitudinal beam includes an outer lower longitudinal beam component disposed on the outer side of the vehicle body and an inner lower longitudinal beam component disposed on the inner side of the vehicle body, closer to the vehicle body than the outer lower longitudinal beam component. The inner lower longitudinal beam component has an inner wall portion extending vertically, an inner roof portion extending from the upper end of the inner wall portion toward the outer side of the vehicle body, an inner flange portion extending upward from the end of the inner roof portion, and a flange portion extending from the height direction of the inner wall portion. The rear frame has an inner extension that extends laterally toward the inside of the vehicle body. The front part of the rear frame has a frame wall that extends vertically in a U-shaped cross section, a frame roof that extends from the upper end of the frame wall toward the outside of the vehicle body, and a frame floor that extends from the lower end of the frame wall toward the outside of the vehicle body. The end of the frame floor is placed on the inner extension. The frame roof covers the inner roof from above. In this configuration, the front part of the rear frame is fixed to the lower longitudinal beam.
[0021] Invention Effects
[0022] In the invention of technical solution 1, the end portion of the frame floor is placed on the inner protrusion, and the frame roof portion covers the inner roof portion.
[0023] That is, the rear frame can be fixed to the lower longitudinal beam simply by lowering the rear frame from above to the stationary lower longitudinal beam.
[0024] Horizontal movement of the rear frame is not necessary; it can be moved from top to bottom.
[0025] Moving the rear frame downwards is easy. Therefore, it is possible to reduce the manufacturing cost of the rear structure of the vehicle body. Attached Figure Description
[0026] Figure 1 This is a side view of the rear structure of the vehicle body according to the present invention.
[0027] Figure 2 It is along Figure 1 Arrow 2 shows the diagram.
[0028] Figure 3 (a) is a side view of the rear frame. Figure 3 (b) is along Figure 3 (a) is a sectional view of the bb line. Figure 3 (c) is along Figure 3 A sectional view of the cc line of (a).
[0029] Figure 4(a) is Figure 3 Enlarged view of part 4a in (b), Figure 4 (b) is Figure 4 An enlarged view of part b of (a). Figure 4 (c) is a diagram showing a variation of the central rear frame.
[0030] Figure 5 (a) is an exploded view of the lower longitudinal beam. Figure 5 (b) is a sectional view of the lower longitudinal beam.
[0031] Figure 6 (a) is a diagram illustrating the process of joining the rear frame to the lower longitudinal beam. Figure 6 (b) is along Figure 2 A sectional view along line 6b-6b. Figure 6 (c) is Figure 6 Enlarged view of part c in (b), Figure 6 (d) is Figure 6 Enlarged view of part d of (b).
[0032] Figure 7 (a) is an exploded view of the front end connecting component. Figure 7 (b) is a cross-sectional view of the front end connecting component.
[0033] Figure 8 (a) is a diagram illustrating the process of joining the rear frame to the lower longitudinal beam and the process of joining the front end connecting component to the rear frame. Figure 8 (b) is along Figure 2 A sectional view along line 8b-8b. Figure 8 (c) is Figure 8 Enlarged view of part c in (b), Figure 8 (d) is Figure 8 Enlarged view of part d in (b), Figure 8 (e) is Figure 8 Enlarged view of part e in (b).
[0034] Figure 9 (a) and (b) are diagrams illustrating the height position of the inner protrusion.
[0035] Figure 10 Figures (a) and (b) illustrate examples of modifications to the inner protrusion.
[0036] Figure 11 (a) and (b) are diagrams illustrating the role of the center of the rear frame.
[0037] Figure 12 This is a cross-sectional view of the main parts of the existing rear structure of the vehicle body. Detailed Implementation
[0038] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In the drawings, the front and rear, top and bottom, inner and outer sides of the vehicle body are defined with respect to the driver of the vehicle.
[0039] Example
[0040] [Rear Structure of the Vehicle Body]
[0041] like Figure 1 As shown, the rear structure 10 of the vehicle body includes: a lower longitudinal beam 20; a rear frame 40 extending rearward from the lower longitudinal beam 20; and a rear wheel arch 12 disposed on the outside of the rear frame 40.
[0042] And, as Figure 2 As shown, the rear structure 10 of the vehicle body includes: a floor crossbeam 14, which is disposed in front of the rear frame 40 and extends from the lower longitudinal beam 20 toward the inside of the vehicle body; and a front end connecting member 60, which connects the front end of the rear frame 40 to the floor crossbeam 14.
[0043] In addition, Figure 2 The floor panel is omitted.
[0044] [Post-frame]
[0045] like Figure 3 As shown in (a), the rear frame 40 is a long condition extending front and rear. Preferably, the rear frame 40 is a die-cast aluminum alloy.
[0046] Aluminum alloy is a lightweight alloy, which enables the rear frame 40 to be lightweight. However, to further reduce weight, the first slot 41 and the second slot 42 are used for weight reduction.
[0047] By setting the first slot 41 and the second slot 42, weight reduction can be further achieved, but the strength is reduced.
[0048] Therefore, it is preferable to provide a plurality of vertically extending I-ribs 43 in the first slot 41 (two in this example) and a plurality of vertically extending I-ribs 43 in the second slot 42 (six in this example).
[0049] The area above the first groove 41 and the second groove 42 forms the frame flange 44.
[0050] Furthermore, the inner rib-shaped flange 45 is shown in dashed lines between the first groove 41 and the second groove 42 and below the second groove 42.
[0051] because Figure 3 The rear frame 40 shown in (a) is also offset in the rear direction of the attached diagram, therefore the cross-section varies depending on the location of the vehicle body in the front-rear direction. Therefore, based on... Figure 3(b) describes the front section, based on Figure 3 (c) describes the central section.
[0052] [Cross-section of the front part of the rear frame]
[0053] like Figure 3 As shown in (b), the front of the rear frame 40 has a frame wall portion 47 extending vertically, a frame roof portion 48 extending from the upper end of the frame wall portion 47 toward the outside of the vehicle body, a frame flange portion 44 extending upward from the end of the frame roof portion 48, and a frame floor portion 49 extending from the lower end of the frame wall portion 47 toward the outside of the vehicle body. The front of the rear frame 40 has a U-shaped cross section with the opening gradually widening outward.
[0054] The first groove 41 is formed by an I-shaped rib that crosses the ko-shaped cross section. Figure 3 (a), label 43) is reinforced.
[0055] Preferably, the rear frame 40 further has an inner rib-shaped flange 45 extending laterally from the upper end of the frame wall 47 toward the inner side of the vehicle body. Details of the inner rib-shaped flange 45 will be provided laterally based on... Figure 4 Explain (a).
[0056] [Central section of the rear frame]
[0057] like Figure 3 As shown in (c), the rear frame 40 has a vertically extending frame wall portion 47 at its center, a frame roof portion 48 extending from the upper end of the frame wall portion 47 toward the outer side of the vehicle body, a frame flange portion 44 extending upward from the end of the frame roof portion 48, and a frame floor portion 49 extending from the lower end of the frame wall portion 47 toward the outer side of the vehicle body. Preferably, it also has an inner rib-shaped flange 45 extending laterally from the lower end of the frame wall portion 47 toward the inner side of the vehicle body.
[0058] The second groove 42 is reinforced by an I-shaped rib 43 that runs through the cross section of the ko-shaped section.
[0059] [Inner rib-like flange]
[0060] like Figure 4 As shown in (a), the thickness t1 at the root of the inner rib flange 45 is set to be approximately equal to the thickness t2 of the frame wall portion 47. Furthermore, the inner rib flange 45 is a pointed tapered rib whose thickness decreases towards the end in order to provide the draft angle for casting.
[0061] The ends of the slender, tapered ribs can be protruding, but are preferably as follows: Figure 4 As shown in (b), it is a circle with radius R. By setting it to a circle, end defects can be prevented.
[0062] Since the inner rib-shaped flange 45 is a sharp, tapered rib, it can suppress the increase in weight.
[0063] Furthermore, due to the sharp, tapered ribs, the draft angle during casting is ensured, making it extremely easy to separate the inner rib-shaped flange 45 from the casting mold.
[0064] [Location of the inner rib-like flange]
[0065] It can also be like Figure 4 As shown in (c), the inner rib-shaped flange 45 extends into the vehicle body midway along the height direction of the frame wall portion 47. Thus, the inner rib-shaped flange 45 can extend from any part of the frame wall portion 47.
[0066] [Lower longitudinal beam]
[0067] Next, based on Figure 5 (a) and (b) describe the construction of the lower longitudinal beam 20.
[0068] like Figure 5 As shown in (a), the lower longitudinal beam 20 is composed of an outer lower longitudinal beam component 21 disposed on the outer side of the vehicle body, a reinforcing component 22 disposed on the inner side of the vehicle body than the outer lower longitudinal beam component 21, and an inner lower longitudinal beam component 23 disposed on the inner side of the vehicle body than the reinforcing component 22. Furthermore, the reinforcing component 22 is provided as needed and is therefore not a necessary component.
[0069] The lower longitudinal beam outer component 21, reinforcing component 22, and lower longitudinal beam inner component 23 are preferably stamped products made of steel plates. Stamped products are also known as stamped products.
[0070] [Lower longitudinal beam internal components]
[0071] The lower longitudinal beam inner component 23 has an inner wall portion 24 extending vertically, an inner roof portion 25 extending from the upper end of the inner wall portion 24 toward the outer side of the vehicle body, an inner flange portion 26 extending upward from the end of the inner roof portion 25, an inner extension portion 27 extending laterally from the middle of the height direction of the inner wall portion 24 toward the inner side of the vehicle body, and an inner floor portion 28 extending from the lower end of the inner wall portion 24 toward the outer side of the vehicle body.
[0072] like Figure 5 As shown in (a), the inner protrusion 27 is, for example, a slit 32 obtained by cutting a notch 31 into the inner wall portion 24 and bending it at about 90° as indicated by the arrow. The slit 32 is formed simultaneously in the stamping process.
[0073] like Figure 5 As shown in (b), the lower longitudinal beam outer component 21, the reinforcing component 22 and the lower longitudinal beam inner component 23 are overlapped left and right and joined together by means of spot welding fusion nugget 33, etc., to obtain the lower longitudinal beam 20.
[0074] [The effect of slicing]
[0075] An opening 34, approximately the same size as the cutting blade 32, is formed in the inner wall portion 24. This opening 34 serves as a passage for the paint during electrodeposition coating of the lower longitudinal beam 20. The opening 34 is large enough that a sufficient amount of paint flows in and out. As a result, electrodeposition coating of the lower longitudinal beam 20 can be performed effectively, and the rust resistance of the lower longitudinal beam 20 is improved.
[0076] [Method for joining the rear structure of the vehicle body excluding the front connecting member 60]
[0077] based on Figure 6 (a) to (d), along Figure 2 The connection method between the lower longitudinal beam 20 and the rear frame 40 in the section of line 6b-6b is described.
[0078] like Figure 6 As shown in (a), firstly, the rear frame 40 is moved from top to bottom relative to the stationary lower longitudinal beam 20.
[0079] In detail, the end of the frame floor portion 49 is placed on the inner protrusion portion 27 as shown by arrow (1), the frame roof portion 48 is covered from above the inner roof portion 25 as shown by arrow (2), and the frame flange portion 44 is attached to the inner flange portion 26.
[0080] Then, as Figure 6 As shown in (b), the joints are joined by at least one of mechanical fastening, welding and bonding (in this example, rivet 65).
[0081] Besides rivets (65), mechanical fasteners can also be bolts or threaded rods.
[0082] Furthermore, fusion welding can employ methods such as friction stir bonding, spot welding, and laser welding.
[0083] Furthermore, a one-component adhesive or a two-component adhesive is preferred for bonding.
[0084] It is possible Figure 6 As shown in (c), the lower longitudinal beam outer component 21, the reinforcing component 22, the inner flange portion 26 of the lower longitudinal beam inner component 23, and the frame flange portion 44 are joined by, for example, rivets 65.
[0085] And, it can be like Figure 6 As shown in (d), the inner protrusion 27 and the frame floor portion 49 are joined by, for example, rivets 65.
[0086] [Front-end connecting component]
[0087] based on Figure 7 (a) and (b) are related to Figure 2 The details of the front end connecting component 60 will be explained.
[0088] like Figure 7 As shown in (a), the front end connecting member 60 is composed of a connecting part floor 61, a connecting part wall 62 erected from one end of the connecting part floor 61, and a connecting part roof 63.
[0089] Preferably, the connecting portion floor portion 61 and the raised connecting portion wall portion 62 are integrally formed by stamping a steel plate into an L-shaped cross section. Furthermore, the connecting portion roof portion 63 is obtained by stamping a steel plate into an I-shaped cross section.
[0090] like Figure 7 As shown in (b), the connecting portion canopy portion 63 is placed on the connecting portion wall portion 62 to form a roughly U-shaped cross section. However, the two are not yet joined.
[0091] [Method for joining the rear structure of the vehicle body, including the front end connecting member 60]
[0092] based on Figure 8 (a) to (e), along Figure 2 The joining method of the lower longitudinal beam 20, the rear frame 40, and the front end connecting component 60 in the cross section of line 8b-8b will be described.
[0093] like Figure 8 As shown in (a), firstly, relative to the stationary lower longitudinal beam 20, the connecting floor portion 61 and the connecting wall portion 62 are lifted so that the connecting floor portion 61 abuts against the inner protrusion portion 27 (arrow (3)).
[0094] Next, the rear frame 40 is moved from top to bottom. Specifically, the end of the frame floor portion 49 is placed on the inner protrusion portion 27 as shown by arrow (4), the frame canopy portion 48 covers the inner canopy portion 25 as shown by arrow (5), and the frame flange portion 44 is attached to the inner flange portion 26. At the same time, an inner rib-shaped flange 45 (arrow (6)) is placed on the upper end of the connecting portion wall portion 62.
[0095] That is, the rear frame 40 is provided with an L-shaped connecting floor portion 61 and a connecting wall portion 62 that open on the upper surface by moving from top to bottom.
[0096] Next, as indicated by arrow (7), the connecting portion roof 63 is placed on the frame roof 48, and as indicated by arrow (8), one end of the connecting portion roof 63 is placed on the inner rib flange 45.
[0097] Then, as Figure 8 As shown in (b), the joint portions are joined by at least one of mechanical fastening, welding and bonding.
[0098] like Figure 8 As shown in (c), the lower longitudinal beam outer component 21, the reinforcing component 22, the inner flange portion 26 of the lower longitudinal beam inner component 23, and the frame flange portion 44 are joined by, for example, rivets 65.
[0099] And, as Figure 8 As shown in (d), the inner protrusion 27, the frame floor portion 49, and the connecting floor portion 61 are joined together using, for example, rivets 65.
[0100] And, as Figure 8 As shown in (e), the inner rib-shaped flange 45, the connecting wall portion 62, and the connecting canopy portion 63 are joined together using, for example, rivets 65.
[0101] like Figure 8 As shown in (b), the connecting part floor portion 61 is shaped along the frame floor portion 49, the connecting part wall portion 62 is shaped along the frame wall portion 47, and the connecting part roof portion 63 is shaped along the frame roof portion 48. Therefore, the front end of the rear frame 40 can be surrounded by the front end connecting member 60.
[0102] [Height position of the inner protrusion]
[0103] like Figure 9 As shown in (a), for the rear frame 40 with a height dimension of H1, an inner protrusion 27 is provided at the middle position of the inner wall portion 24 in the height direction.
[0104] like Figure 9 As shown in (b), for the rear frame 40 whose height dimension H2 is greater than the height dimension H1, an inner protrusion 27 is provided at a lower position in the height direction of the inner wall portion 24.
[0105] That is, the inner protrusion 27 can extend from the height direction of the inner wall 24 at any height, resulting in the ability to freely select the height dimension of the rear frame 40 and expand the design freedom of the rear frame 40.
[0106] [Example of changes to the inner protruding part]
[0107] It can also be like Figure 10 As shown in (a), the inner protrusion 27 is a bracket 36 that is separate from the inner wall portion 24 (another component). The bracket 36 is preferably an angle steel, but it can also be a laterally extending strip plate (I-section steel plate).
[0108] like Figure 10 As shown in (b), the bracket 36 is joined to the inner wall portion 24 by mechanical bonding, welding or adhesive bonding.
[0109] The height of bracket 36 can be set arbitrarily. That is, it can achieve the same height as... Figure 9The same effect as (a) and (b).
[0110] [The role of the center in the back frame]
[0111] like Figure 11 As shown in (a), the rear frame 40 has a frame wall portion 47 extending vertically at its center, a frame roof portion 48 extending from the upper end of the frame wall portion 47 toward the outer side of the vehicle body, a frame flange portion 44 extending upward from the end of the frame roof portion 48, a frame floor portion 49 extending from the lower end of the frame wall portion 47 toward the outer side of the vehicle body, and an inner rib-shaped flange 45 extending laterally from the lower end of the frame wall portion 47 toward the inner side of the vehicle body.
[0112] Furthermore, the rear wheel arch 12 is moved laterally from the outside to the inside of the vehicle body to abut against the frame flange 44. Also, the floor panel 16 is moved downwards to rest on the inner rib flange 45.
[0113] like Figure 11 As shown in (b), the rear wheel arch 12 is joined to the frame flange 44 by means of, for example, rivets 65, and the floor panel 16 is joined to the inner rib flange 45 by means of, for example, rivets 65.
[0114] Based on the above-mentioned matters, the present invention can be summarized as follows.
[0115] like Figure 1 As shown, a rear structure 10 of a vehicle body includes a lower longitudinal beam 20 and a rear frame 40 extending from the lower longitudinal beam 20 toward the rear of the vehicle body, as... Figure 5 As shown in (a), the aforementioned lower longitudinal beam 20 includes an outer lower longitudinal beam component 21 disposed on the outer side of the aforementioned vehicle body and an inner lower longitudinal beam component 23 disposed on the inner side of the aforementioned vehicle body, closer to the outer lower longitudinal beam component 21. The inner lower longitudinal beam component 23 has an inner wall portion 24 extending vertically, an inner roof portion 25 extending from the upper end of the inner wall portion 24 toward the outer side of the aforementioned vehicle body, an inner flange portion 26 extending upward from the end of the inner roof portion 25, and an inner protrusion portion 27 extending laterally from the middle of the height direction of the aforementioned inner wall portion 24 toward the inner side of the aforementioned vehicle body. Figure 3 As shown in (b), the front part of the aforementioned rear frame 40 has a frame wall portion 47 extending vertically in a U-shaped cross-section, a frame roof portion 48 extending from the upper end of the frame wall portion 47 toward the outer side of the aforementioned vehicle body, and a frame floor portion 49 extending from the lower end of the aforementioned frame wall portion 47 toward the outer side of the aforementioned vehicle body, as shown in (b). Figure 6 As shown in (a), the end portion of the aforementioned frame floor portion 49 rests on the aforementioned inner protrusion portion 27, and the aforementioned frame canopy portion 48 covers the aforementioned inner canopy portion 25, as shown in (a). Figure 2 As shown, in this configuration, the front of the aforementioned rear frame 40 is fixed to the aforementioned lower longitudinal beam 20.
[0116] like Figure 6 As shown in (a), the rear frame 40 is positioned within the lower longitudinal beam internals 23 only by moving downwards. No lateral movement is required, thus simplifying manufacturing and reducing costs.
[0117] Preferably, such as Figure 3 As shown in (b), the aforementioned rear frame 40 also has an inner rib-like flange 45 that extends laterally from the upper end of the aforementioned frame wall portion 47 toward the inner side of the aforementioned vehicle body. Alternatively, as... Figure 4 As shown in (c), the aforementioned rear frame 40 also has an inner rib-shaped flange 45 that extends laterally from the midway of the height direction of the aforementioned frame wall portion 47 toward the inner side of the aforementioned vehicle body.
[0118] The strength of the rear frame 40 can be improved by the reinforcing effect of the inner rib-shaped flange 45. By changing the height position of the inner rib-shaped flange 45, the load dispersion characteristics during a collision can be changed.
[0119] Furthermore, in cases such as Figure 8 When the front end connecting member 60 is set as shown in (b), it is possible to achieve the following: Figure 8 As shown in (e), a portion of the front end connecting member 60 is engaged with the inner rib flange 45, making the installation of the front end connecting member 60 easy.
[0120] Preferably, such as Figure 10 As shown in (a) and (b), the aforementioned inner protrusion 27 is a bracket 36 that is independent of the aforementioned inner wall portion 24.
[0121] The bracket 36 can be configured with any cross-sectional shape, such as an L-shaped cross section or a laterally extending I-shaped cross section.
[0122] Because it is independent, the bracket 36 can be installed at any height on the inner wall 24. As a result, the design freedom of the rear frame 40 is increased.
[0123] Preferably, such as Figure 5 As shown in (a) and (b), the aforementioned inner protrusion 27 is a cut piece 32 obtained by cutting a notch 31 into the aforementioned inner wall portion 24 and bending it.
[0124] The inner protrusion 27 is integrally formed with the inner wall portion 24, so no additional parts are required.
[0125] The inner protrusion 27 can be positioned at any height on the inner wall 24. As a result, the design freedom of the rear frame 40 is increased.
[0126] Furthermore, by cutting, an opening 34 is formed in the inner wall portion 24. This opening 34 is used as an inlet and outlet for the coating during electrodeposition.
[0127] Preferably, such as Figure 2 As shown, the rear structure 10 of the vehicle body also includes a floor crossbeam 14 that is orthogonal to the lower longitudinal beam inner component 23 and extends toward the inner side of the aforementioned vehicle body, and a front end connecting component 60 that connects the aforementioned rear frame 40 and the aforementioned floor crossbeam 14, as shown. Figure 8 As shown in (b), the front end connecting member 60 is composed of a connecting portion floor 61 along the aforementioned frame floor portion 49, a connecting portion wall 62 along the aforementioned frame wall portion 47, and a connecting portion ceiling 63 along the aforementioned frame ceiling portion 48, and the aforementioned front end connecting member 60 surrounds the front end of the aforementioned rear frame 40.
[0128] like Figure 2 As shown, the rear frame 40 and the floor crossbeam 14 are connected by the front end connecting member 60, thus improving the strength of the rear structure 10 of the vehicle body in the event of a rear-end collision. The front part of the rear frame 40, which is a die-cast product, can be firmly fixed to the lower longitudinal beam inner member 23, which is a sheet metal stamping product, and the floor crossbeam 14 by the front end connecting member 60.
[0129] And, as Figure 8 As shown in (a), the front end connecting part 60 can be assembled by moving the rear frame 40 downward, making the assembly of the rear frame 40 and the front end connecting part 60 easy.
[0130] Preferably, such as Figure 11 As shown in (a), the rear structure 10 of the vehicle body also includes a rear wheel arch 12 and a floor panel 16. The aforementioned rear frame 40 has a vertically extending frame wall portion 47 at its center, a frame roof portion 48 extending from the upper end of the frame wall portion 47 toward the outer side of the aforementioned vehicle body, a frame flange portion 44 extending upward from the end of the frame roof portion 48, a frame floor portion 49 extending from the lower end of the aforementioned frame wall portion 47 toward the outer side of the aforementioned vehicle body, and an inner rib-like flange 45 extending laterally from the lower end of the aforementioned frame wall portion 47 toward the inner side of the aforementioned vehicle body. Figure 11 As shown in (b), the aforementioned rear wheel cover 12 is engaged with the aforementioned frame flange 44, and the aforementioned floor panel 16 is engaged with the aforementioned inner rib flange 45.
[0131] The rear wheel arch 12 and rear frame 40 can be assembled in the left-right direction, and the floor panel 16 and rear frame 40 can be assembled in the up-down direction, making the assembly of the rear of the vehicle body easier and improving productivity.
[0132] Preferably, the aforementioned rear frame 40 is a die-cast aluminum alloy, and the aforementioned front end connecting part 60 is a stamped steel plate.
[0133] like Figure 2As shown, the aforementioned rear frame 40 and the aforementioned front end connecting component 60 are joined by at least one of mechanical fastening, welding, and bonding (in the embodiment, a rivet 65).
[0134] It can join aluminum alloys and steel plates, which are dissimilar materials.
[0135] Preferably, such as Figure 3 (a) and Figure 3 As shown in (c), the aforementioned rear frame 40 has multiple I-ribs 43 that traverse the aforementioned ko-shaped cross section.
[0136] It can suppress the weight increase of the rear frame 40 and improve the strength and rigidity of the rear of the vehicle body. In the event of a rear-end collision, it can absorb impact energy.
[0137] Preferably, such as Figure 3 As shown in (a) to (c), the aforementioned rear frame 40 has an inner rib-like flange 45 that extends laterally from the aforementioned frame wall 47 toward the inner side of the aforementioned vehicle body, as... Figure 4 As shown in (a), the inner rib-shaped flange 45 is a pointed tapered rib, and the thickness t1 at the root of the tapered rib is set to be approximately equal to the thickness t2 of the aforementioned frame wall portion 47.
[0138] By providing the inner rib-shaped flange 45, the strength and rigidity of the rear frame 40 can be improved. By providing the inner rib-shaped flange 45 along the entire length of the rear frame 40, the strength and rigidity of the rear frame 40 can be maintained or improved, and the rear frame 40 can be made lighter.
[0139] And, if using Figure 4 (a) and Figure 4 As illustrated in (c), the inner ribbed flange 45 can be positioned at any height on the frame wall 47.
[0140] Thus, in Figure 11 When the height position of the floor panel 16 shown in (b) changes, the height position of the inner rib flange 45 can be easily changed to the height position of the floor panel 16. As a result, the design freedom of the floor panel 16 is increased.
[0141] Furthermore, by setting the inner rib-shaped flange 45 as a sharp tapered rib, the draft angle can be ensured, making demolding after casting easier and improving the productivity of the cast frame.
[0142] Industrial availability
[0143] This invention is suitable for the rear structure of a vehicle body with a lower longitudinal beam and a rear frame.
[0144] Label Explanation
[0145] 10: Rear body structure; 12: Rear wheel arch; 14: Floor crossbeam; 16: Floor panel; 20: Lower longitudinal beam; 21: Lower longitudinal beam outer component; 22: Reinforcing component; 23: Lower longitudinal beam inner component; 24: Inner wall; 25: Inner roof; 26: Inner flange; 27: Inner protrusion; 28: Inner floor; 31: Cutout; 32: Cutting piece; 36: Bracket; 40: Rear frame; 43: I-rib; 44: Frame flange; 45: Inner rib flange; 47: Frame wall; 48: Frame roof; 49: Frame floor; 60: Front end connecting component; 61: Connecting part floor; 62: Connecting part wall; 63: Connecting part roof.
Claims
1. A rear structure of a vehicle body, comprising a lower longitudinal beam and a rear frame extending rearward from the lower longitudinal beam toward the rear of the vehicle body, wherein, The lower longitudinal beam includes an outer lower longitudinal beam component disposed on the outer side of the vehicle body and an inner lower longitudinal beam component disposed on the inner side of the vehicle body, closer to the outer lower longitudinal beam component. The lower longitudinal beam internal component has an inner wall portion extending vertically, an inner roof portion extending from the upper end of the inner wall portion toward the outer side of the vehicle body, an inner flange portion extending upward from the end of the inner roof portion, and an inner protrusion portion extending laterally toward the inner side of the vehicle body from the middle of the height direction of the inner wall portion. The front part of the rear frame has a frame wall portion extending vertically in a U-shaped cross-section, a frame roof portion extending from the upper end of the frame wall portion towards the outer side of the vehicle body, and a frame floor portion extending from the lower end of the frame wall portion towards the outer side of the vehicle body. The end portion of the frame floor rests on the inner protrusion, and the frame roof portion covers the inner roof portion. In this configuration, the front part of the rear frame is fixed to the lower longitudinal beam.
2. The rear structure of the vehicle body according to claim 1, wherein, The rear frame also has an inner rib-like flange that extends laterally from the upper end of the frame wall or along the middle of the height direction toward the inside of the vehicle body.
3. The rear structure of the vehicle body according to claim 1, wherein, The inner protrusion is a bracket independent of the inner wall portion.
4. The rear structure of the vehicle body according to claim 1, wherein, The inner protrusion is a slit obtained by cutting and bending the inner wall portion.
5. The rear structure of the vehicle body according to claim 1, wherein, The rear structure of the vehicle body also includes a floor crossbeam orthogonal to the lower longitudinal beam internal components and extending inwards towards the vehicle body, as well as a front end connecting component connecting the rear frame and the floor crossbeam. The front end connecting component is composed of a connecting portion floor along the frame floor, a connecting portion wall along the frame wall, and a connecting portion ceiling along the frame ceiling. The front end connecting component surrounds the front end of the rear frame.
6. The rear structure of the vehicle body according to claim 1, wherein, The rear structure of the vehicle also includes rear wheel arches and a floor panel. The rear frame has a frame wall extending vertically at its center, a frame roof extending from the upper end of the frame wall toward the outer side of the vehicle body, a frame flange extending upward from the end of the frame roof, a frame floor extending from the lower end of the frame wall toward the outer side of the vehicle body, and an inner rib-shaped flange extending laterally from the lower end of the frame wall toward the inner side of the vehicle body. The rear wheel arch is engaged with the frame flange, and the floor panel is engaged with the inner rib flange.
7. The rear structure of the vehicle body according to claim 1, wherein, The rear frame has multiple I-ribs that traverse the コ-shaped cross section.
8. The rear body structure according to claim 5, wherein, The rear frame is a die-cast aluminum alloy. The front end connecting component is a stamped steel plate. The rear frame and the front end connecting component are joined by at least one of mechanical fastening, welding, and bonding.