Lower body structure of vehicle

Abstract

To achieve the purpose of transmitting the rear impact load of the input side beam front end portion to the rear of the side beam without increasing the mass and cost, the present application describes a vehicle lower body structure, which is provided with: a side beam, which is arranged on the vehicle lower part and the outer side in the vehicle width direction, and forms a closed cross section extending in the vehicle front-rear direction inside; a wheel, which is located in front of the side beam; wherein the side beam is provided with an outer side beam, which has a front end portion and a main body portion located behind the front end portion; in the front end portion of the outer side beam, an outer side reinforcing member is joined from the inside or outside of the closed cross section, and the outer side reinforcing member has a shape along the front side surface portion and the side surface portion of the front end portion; the front end of the main body portion is opposite to the rear end of the side surface portion of the outer side reinforcing member in the vehicle front-rear direction; the main body portion has a protruding portion protruding to the inside of the closed cross section relative to the rear end of the side surface portion.

Description

Technical Field

[0001] The present invention relates to a vehicle lower body structure, for example, including a side beam formed on the outer side in the vehicle width direction with a closed section extending in the vehicle longitudinal direction, and a wheel located in front of the side beam. Background Technology

[0002] In a partial collision (small overlap) where an obstacle (barrier) occurs from the front of the vehicle or the front side of the vehicle, closer to the outer end in the vehicle width direction than the front side frame, the rearward wheels will impact the front end of the side frame, resulting in a rearward impact load input to the front end of the side frame. Transferring this rearward impact load from the front end of the side frame to the rear of the side frame helps to prevent excessive reinforcement of the vehicle body, and is therefore preferred.

[0003] In addition, Patent Document 1 proposes a vehicle side structure that includes a reinforcing member for strengthening the front end of the side beam in response to small overlap collisions.

[0004] In the vehicle side structure of Patent Document 1, an outer reinforcing member (30) is provided on the inner side of the front end of the outer beam located on the outer side in the vehicle width direction, which at least reinforces the front side and the outer side in the vehicle width direction.

[0005] However, the outer reinforcing member (30) extends further back than the front end of the side beam, which may lead to an increase in weight and cost.

[0006] Existing technical documents Patent Document: Patent Document 1: Japanese Patent Application Publication No. 2015-058749. Summary of the Invention

[0007] The technical problem that the invention aims to solve In view of the above-mentioned technical problems, the present invention aims to provide a vehicle lower body structure that transmits rearward impact loads input to the front end of the side beam to the rear of the side beam without increasing mass and cost.

[0008] Technical means to solve technical problems The lower body structure of the vehicle of the present invention is characterized by comprising: a side beam disposed on the lower part of the vehicle and on the outer side in the vehicle width direction, and formed by an inner side beam located on the inner side in the vehicle width direction and an outer side beam located on the outer side in the vehicle width direction having a front end portion and a main body portion, forming a closed cross section extending in the vehicle longitudinal direction; a wheel located in front of the outer side beam; an outer reinforcing member having a front side portion and a side portion along the front end portion of the outer side beam; wherein the outer reinforcing member is mounted to the front end portion from the inner side or the outer side of the closed cross section; the front end portion of the main body portion and the rear end portion of the side portion of the outer reinforcing member face each other in the vehicle longitudinal direction; the main body portion has a protrusion disposed on the side portion side of the front end portion relative to the rear end portion of the side portion of the outer side beam in the vehicle width direction, and protruding relative to the rear end portion to a side opposite to the side portion side portion side of the front end portion.

[0009] According to the technical solution, when an impact load directed rearward is input into the side beam from the front, the outer reinforcing member will maintain the shape of the front end of the outer beam while attempting to displace it rearward. At this time, the rear end of the retracting outer reinforcing member will engage with the front end of the protrusion provided in the main body of the outer beam, and the load will be transmitted from the outer reinforcing member to the main body located at the rear.

[0010] Therefore, it can transfer the impact load from the front input side beam toward the rear to the rear without increasing mass or cost.

[0011] As a variant of the present invention, it is preferable to provide a protrusion extending rearward toward the front end of the main body portion on the side portion of the outer reinforcing member.

[0012] According to the technical solution, when an impact load from the front input side beam towards the rear causes the outer reinforcing member to retract, the protrusion can engage with the side portion of the main body to restrict the relative movement of the outer reinforcing member relative to the main body in the vehicle width direction.

[0013] Therefore, the rear end of the retracted outer reinforcing member can be more reliably engaged with the protrusion provided in the main body, thereby improving the efficiency of load transfer from the outer reinforcing member to the main body.

[0014] As a form of the present invention, it is preferable that the protrusion is formed by a reinforcing rib extending in the front-rear direction of the main body.

[0015] According to the technical solution, since the protrusion is formed by reinforcing ribs, the load transfer efficiency in the front-rear direction of the main body can be improved.

[0016] As a variant of the invention, preferably, in the side portion of the outer reinforcing member, the reinforcing member transverse ridge extending continuously forward from the rear end is formed at approximately the same height as the protrusion transverse ridge extending in the forward-backward direction in the protrusion.

[0017] According to the technical solution, when an impact load directed toward the rear is input to the side beam from the front, the outer reinforcing member will move backward, thereby making the transverse ridge line of the reinforcing member and the transverse ridge line of the protrusion at the same height continuous in the longitudinal direction of the vehicle.

[0018] In other words, the rear end of the side portion of the outer reinforcing member, whose rigidity is increased by the transverse ridge of the reinforcing member, will firmly engage (abut) with the front end of the protrusion of the main body portion, whose rigidity is increased by the protrusion of the protrusion of the transverse ridge. Therefore, the efficiency of load transfer from the outer reinforcing member to the main body portion can be improved.

[0019] As a form of the present invention, it is preferable that an outer transverse ridge extending rearward from the front end of the main body is formed at the boundary between the upper side portion and the side portion of the main body; the protruding portion extends rearward along the outer transverse ridge in a manner that allows it to engage with the upper side portion and the side portion of the main body.

[0020] According to the technical solution, when the impact load from the front input side beam towards the rear causes the outer reinforcing member to retract, the protrusion will not only engage with the side part of the main body but also with the upper side part. Therefore, it can not only restrict the relative movement of the outer reinforcing member relative to the main body in the vehicle width direction but also restrict its relative movement in the vertical direction.

[0021] This prevents the relative height of the horizontal ridge line of the reinforcing member and the horizontal ridge line of the protrusion from shifting when the outer reinforcing member moves backward, thus ensuring that the horizontal ridge line of the reinforcing member and the horizontal ridge line of the protrusion are more continuous in the longitudinal direction of the vehicle.

[0022] As a form of the invention, it is preferable that the protrusion has a pair of transverse wall portions that are separated from each other in the vertical direction of the vehicle and extend in the width direction of the vehicle, and at least one of the pair of transverse wall portions overlaps with the rear end of the outer reinforcing member in the vehicle's main viewing angle.

[0023] According to the technical solution, since at least one of the paired transverse wall portions overlaps with the rear end of the outer reinforcing member in the vehicle's main view, the retracting outer reinforcing member can reliably engage with the main body portion when an impact load is input to the front end of the side beam facing rearward.

[0024] Therefore, it can improve the efficiency of load transfer from the outer reinforcing members to the main body.

[0025] As a variant of the present invention, it is preferable that a rear end recess is formed at a location in the outer reinforcing member where at least one of the paired transverse wall portions of the protrusion is at the same height, extending forward from the rear end.

[0026] According to the technical solution, when an impact load input from the front of the side beam toward the rear of the vehicle causes the outer reinforcing member to retract, the periphery of the rear recess will engage with one of the transverse wall portions of the protrusion that is at the same height as the rear recess.

[0027] This allows the rear end of the retracted outer reinforcing member to engage more securely with the protrusion provided on the main body, thereby improving the efficiency of load transfer from the outer reinforcing member to the main body.

[0028] As a variant of the present invention, it is preferable to equip the outer reinforcing member at the front end from one side of the closed section.

[0029] According to the described technical solution, compared to equipping the outer reinforcing member from the outside of the closed section to the front end, the outer reinforcing member can be made compact and simple in shape, thus suppressing the increase in weight. Furthermore, the formability can be improved when the outer reinforcing member is formed by molding.

[0030] As a variant of the present invention, it is preferable that the front end of the outer beam and the boundary of the main body in the vehicle longitudinal direction are located between the front and rear widths of the hinge column extending upward from the side beam.

[0031] According to the technical solution, the lower part of the hinge column is connected to the side beam across the front end and the main body, so that when an impact load toward the rear is input to the front end of the side beam, the load can be reliably transferred from the front end to the main body at the rear of the vehicle.

[0032] Invention Effects According to the technical solution, the impact load from the front end of the input side beam facing backward can be transferred to the rear of the side beam without increasing mass or cost. Attached Figure Description

[0033] Figure 1 This is a top view of the main part of the lower part of the vehicle according to this embodiment; Figure 2 This is a side view of the main part of the lower part of the vehicle according to this embodiment; Figure 3 To observe along from above and from the cockpit side Figure 2 Oblique cross-sectional view of the main part of the arrowhead on line A-A; Figure 4 An oblique view of the front end and surrounding area of ​​the outer beam from the cockpit side; Figure 5 To observe the area from the rear and outside the cockpit Figure 2 Oblique cross-sectional view of the main part of the arrowhead on line A-A; Figure 6 An oblique view of the front end and surrounding area of ​​the inner beam, viewed from the outside of the cockpit; Figure 7 For along Figure 3 or Figure 4 Arrow view of the main part of the C-C line in the diagram; Figure 8 For along Figure 2 or Figure 4 Arrow view of the main part of line A-A in the diagram; Figure 9 For along Figure 2 A cross-sectional view of the main part of the B-B line; Figure 10 This is a longitudinal section diagram showing the results of a simulation experiment analyzing the movement of the front end of the vehicle's side beam during a small overlap collision. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Furthermore, the lower body structure 1 of the vehicle in this embodiment has a roughly symmetrical shape on both sides, so the description will be based on the structure of the right side of the lower part of the vehicle. In the figure, arrow F indicates the front of the vehicle, arrow U indicates the top of the vehicle, arrow OUT indicates the outer side in the vehicle width direction (outer side of the cabin), and arrow IN indicates the inner side in the vehicle width direction (cabin side). Additionally, the "×" mark in the figure indicates a spot weld.

[0036] like Figure 1 , Figure 2 As shown, in the lower vehicle body structure 1 of this embodiment, a passageway 2 protruding upward and extending in the front-rear direction is provided at the center of the cabin floor in the vehicle width direction. A plate-shaped floor 3 (see reference) is horizontally arranged on the left and right sides of the passageway 2 on the cabin floor to form the cabin floor. Figure 1 The left and right ends of the cabin floor have side beams 10 extending in the longitudinal direction. The outer ends of the floor 3 on both sides in the vehicle width direction engage with the inner sides of the corresponding side beams 10 in the vehicle width direction. Additionally, as... Figure 1 As shown, the floor 3 is provided with a floor frame 4 extending in the front-to-back direction and a crossbeam 5 extending in the vehicle width direction.

[0037] like Figure 1 , Figure 2As shown, a wheel 6 is provided in front of the side beam 10 of the vehicle body as a front wheel. The wheel 6 is located in front of the front end of the side beam 10, and is positioned such that at least a portion of it is aligned with the side beam 10 in the vehicle width direction.

[0038] like Figure 1 As shown, in this embodiment, the inner end of the wheel 6 in the vehicle width direction is positioned outside the inner end of the side beam 10 in the vehicle width direction, and the wheel 6 is positioned closer to the outer side in the vehicle width direction than the side beam 10. Furthermore, the upper half of the wheel 6 is covered by an arched wheel cover, which is not shown in the figure.

[0039] The front part of the side beam 10 engages with the lower part of the hinge column 7, which extends vertically along the leading edge of the side door opening of the cabin (see reference). Figure 2 (Hinge column 7 is represented by an imaginary line). In addition, the lower part of hinge column 7, that is, the part of hinge column 7 that joins with the front part of side beam 10, is formed into a shape that gradually expands in the front-to-back direction as it goes down.

[0040] The hinge column 7 has an inner hinge column (not shown in the figure) located inside the vehicle width direction and an outer hinge column 7a located outside the vehicle width direction. By joining and fixing the two components, a closed section that extends continuously in the vertical direction is formed inside, which is not shown in the figure.

[0041] like Figures 1 to 7 As shown, the side beam 10 includes: an inner side beam 11, which has a cap-shaped cross-section opening outward in the vehicle width direction; and an outer side beam 21, which has a cap-shaped cross-section opening inward in the vehicle width direction. Figures 3-7 As shown, in the side beam 10, the inner side beam 11 located inside in the vehicle width direction and the outer side beam 21 located outside in the vehicle width direction cooperate to form a closed section 10s that extends continuously in the front-rear direction.

[0042] Specifically, such as Figure 6 , Figure 7 As shown, the inner beam 11 has: an inner upper side portion 12 that extends generally horizontally; an upper flange portion 13 that extends upward from the outer edge of the inner upper side portion 12 in the vehicle width direction; an inner side portion 14 that extends downward from the inner edge of the inner upper side portion 12 in the vehicle width direction; an inner lower wall portion 15 that extends outward from the lower edge of the inner side portion 14 in the vehicle width direction; and a lower flange portion 16 that extends downward from the outer edge of the inner lower wall portion 15 in the vehicle width direction.

[0043] like Figure 4 , Figure 7As shown, the outer beam 21 has: an outer upper side portion 22 that extends generally horizontally; an upper flange portion 23 that extends upward from the outer edge of the outer upper side portion 22 in the vehicle width direction; an outer side portion 24 that extends downward from the outer edge of the outer upper side portion 22 in the vehicle width direction; an outer lower wall portion 25 that extends inward from the lower edge of the outer side portion 24 in the vehicle width direction; and a lower flange portion 26 that extends downward from the inner edge of the outer lower wall portion 25 in the vehicle width direction.

[0044] In the side beam 10, from a cross-sectional view orthogonal to its longitudinal direction, the upper flanges 13 and 23 of the inner beam 11 and the outer beam 21 are joined together by welding or the like, and the lower flanges 16 and 26 of the two beams are joined together by welding or the like, thereby forming the aforementioned closed cross-section 10s inside the side beam 10.

[0045] like Figures 1-6 As shown, the side beam 10 includes: a front end portion 31 extending rearward from the front end of the side beam 10; and a main body portion 41, substantially entirely disposed behind the rear end of the front end portion 31. Figure 2 As shown, the boundary between the front end 31 of the side beam and the main body 41 of the side beam is positioned relative to the front and rear width of the hinge column 7, and in this example, it is approximately positioned at the middle of the front and rear direction of the hinge column 7.

[0046] like Figures 1-5 , Figure 9 As shown, the outer beam 21 has a front end portion 27 and a main body portion 28. Figure 1 , Figure 3 , Figure 5 , Figure 6 , Figure 9 As shown, the inner beam 11 has an inner beam front end portion 17 and an inner beam main body portion 18. The outer beam front end portion 27 and the inner beam front end portion 17 form a side beam front end portion 31, and the outer beam main body portion 28 and the inner beam main body portion 18 form a side beam main body portion 41.

[0047] like Figures 3-5 As shown, at the boundary between the front end portion 27 of the outer beam and the main body portion 28 of the outer beam, the rear flange 32 of the front end portion 27 of the outer beam and the front flange 42 of the main body portion 28 of the outer beam are joined by spot welding or the like, overlapping each other in the thickness direction. In this embodiment, the rear flange 32 of the front end portion 27 of the outer beam joins the front flange 42 of the main body portion 28 of the outer beam from the outside of the closed section 10s (outside the vehicle width direction).

[0048] In addition, such as Figures 1-5 As shown, in this embodiment, the outer beam 21 is formed by at least two components, the outer beam front end 27 and the outer beam main body 28, but it may also be formed by a single component that includes mutual boundary portions and is continuous in the internal front-rear direction.

[0049] On the other hand, such as Figure 1 , Figure 3 , Figure 5 , Figure 6 As shown, the inner beam 11 is formed by a single component, and the front end 17 and the main body 18 of the inner beam are not formed by different components, but different components can be used to form the front and rear sides of the boundary between each other.

[0050] like Figure 1 , Figures 3-5 , Figure 9 As shown, the front end portion 27 of the outer beam has: an outer front side portion 271, forming the front wall of the outer beam 21; and an outer front rear portion 272, located behind the outer front side portion 271.

[0051] The outer front side portion 271 and the outer front rear portion 272 are formed into a cross-sectional cap shape that opens inward in the vehicle width direction as described above (see reference). Figure 7 But if Figure 4 As shown, the outer front side portion 271 is formed in a bowl shape, and its diameter gradually decreases from the front end of the outer front rear portion 272 toward the front, in the vertical direction and the vehicle width direction.

[0052] Specifically, such as Figure 4 As shown, the outer front side portion 271, like the outer front rear portion 272, has an outer upper side portion 22, an upper flange portion 23, an outer side portion 24a (24), an outer lower wall portion 25, and a lower flange portion 26. However, as Figure 1 , Figures 3-5 , Figure 9 As shown, the outer side portion 24a of the outer front side portion 271 gradually slopes forward from the front end of the outer side portion 24a of the outer front rear portion 272 to the inner end of the outer beam 21 in the vehicle width direction.

[0053] like Figure 2 , Figure 4 As shown, the outer upper side portion 22 and outer lower side portion 25 of the outer front side portion 271 gradually slope forward towards the middle portion of the outer beam 21.

[0054] In addition, such as Figure 4 , Figure 9 As shown, the front end 27 of the outer beam is smooth and continuous in the front-rear direction, and there is no ridge line extending in the vertical direction at the boundary between the rear end of the outer front side portion 271 and the front end of the outer front rear portion 272.

[0055] Furthermore, as described above, the outer beam main body 28 is formed as a cap-shaped section that opens inward in the vehicle width direction (see above). Figure 4).

[0056] In addition, such as Figure 4 As shown, an outer transverse ridge line 241 is formed on the outer beam body 28, extending in the front-rear direction along the boundary between the outer upper side portion 22 and the outer side portion 24b (24).

[0057] like Figure 3 , Figure 4 , Figure 9 As shown, the outer side surface portion 24b of the outer beam main body 28 has an outer protrusion 43 that protrudes inward in the vehicle width direction relative to the periphery at approximately the middle position in the vertical direction. The outer protrusion 43 extends continuously rearward from the front end 42f of the outer beam main body 28.

[0058] However, if the front-to-back length of the outer protrusion 43 is such that it engages with the rear end 54 of the laterally described outer reinforcing member 50, which retracts upon a small overlap collision, thereby receiving the outer reinforcing member 50 through its front end 42f, then the outer protrusion 43 may not extend to the rear of the side beam 10.

[0059] like Figure 4 As shown, the outer protrusion 43 has the following on the outer side surface 24 of the outer beam main body 28: an upper wall portion 44 that stands inward in the vehicle width direction relative to the periphery; a longitudinal wall portion 45 that extends downward in a longitudinal wall shape from the inner end of the upper wall portion 44 in the vehicle width direction; and a lower wall portion 46 that stands inward in the vehicle width direction relative to the periphery to the lower end of the longitudinal wall portion 45.

[0060] That is, the outer protrusion 43 protrudes to the same side (inside of the closed section 10s) on the side where the outer reinforcing member 50 overlaps with the front end 27 of the outer beam.

[0061] An upper transverse ridge 47 is formed at the boundary between the longitudinal wall portion 45 and the upper wall portion 44 of the outer protrusion 43, extending continuously from the front end 42f of the outer protrusion 43 to the rear along the boundary. A lower transverse ridge 48 is formed at the boundary between the longitudinal wall portion 45 and the lower wall portion 46 of the outer protrusion 43, extending continuously from the front end 42f of the outer protrusion 43 to the rear along the boundary.

[0062] In addition, such as Figure 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9 As shown, the front end portion 17 of the inner beam has: an inner front side portion 171, forming the front wall of the inner beam 11; and an inner front rear portion 172, located behind the inner front side portion 171.

[0063] like Figure 6As shown, the inner front side portion 171 of the inner side beam 11 is formed as a longitudinal wall extending in the vehicle width direction and vertical direction, while the inner side beam 11 is formed in the entire inner front rear portion 172 and the inner side beam main body portion 18 (see reference). Figure 9 Within the range of ), it is formed into a cross-sectional cap shape that opens outward in the vehicle width direction as described above.

[0064] Specifically, in the inner beam 11, the inner upper side portion 12 extends continuously rearward from the upper end of the inner front side portion 171, the inner side portion 14 extends continuously rearward from the inner end of the inner front side portion 171 in the vehicle width direction, and the inner lower wall portion 15 extends continuously rearward from the lower end of the inner front side portion 171.

[0065] And, as Figure 5 , Figure 6 , Figure 8 , Figure 9 As shown, an inner longitudinal ridge 141 extending vertically along the boundary between the inner front side portion 171 and the inner side side portion 14 is formed. Furthermore, in this embodiment, the inner front side portion 171 and the inner front rear portion 172 are formed from different components and are joined at their respective boundaries by welding or the like, such that their ends overlap in the thickness direction (see reference). Figure 3 , Figure 5 , Figure 6 ).

[0066] In addition, such as Figure 6 , Figure 7 As shown, an inner transverse ridge 142 is formed on the inner beam 11, extending in the front-rear direction along the boundary between the inner upper side portion 12 and the inner side portion 14.

[0067] In addition, such as Figures 3-6 , Figure 8 , Figure 9 As shown, front flange portions 19 and 29 protruding forward are formed at the outer end of the inner front side portion 171 in the vehicle width direction and the inner end of the outer front side portion 271 in the vehicle width direction, respectively. The front flange portions 19 and 29 are joined together by welding or the like in a state where they overlap each other in the vehicle width direction.

[0068] like Figures 3-5 , Figures 7-9 As shown, the front end portion 27 of the outer beam is provided with an outer reinforcing member 50 to strengthen the front end portion 27 of the outer beam. The outer reinforcing member 50 has a shape along the front end portion 27 of the outer beam.

[0069] Specifically, such as Figure 4As shown, the outer reinforcing member 50 is formed in a bowl shape corresponding to the front end 27 of the bowl-shaped outer beam and has: an outer side reinforcing part 51 along the outer side part 24a of the front end 27 of the outer beam; an outer lower wall reinforcing part 52 along the outer lower wall part 25; and an outer upper wall reinforcing part 53 along the outer upper side part 22.

[0070] The outer reinforcing member 50 is joined to the front end 27 of the outer beam from the inside of the closed section 10s of the side beam 10 by welding or the like, and the outer reinforcing member 50 is substantially the entire overlap of the front end 27 of the outer beam.

[0071] like Figure 4 As shown, the outer reinforcing member 50 is formed in the front end portion 27 of the outer beam over approximately the entire length in the front-rear direction, excluding the front flange portion 29, and the entire rear end portion 54 is located in front of the front end portion 42f of the outer beam body portion 28.

[0072] like Figures 3-5 , Figure 7 , Figure 8 As shown, an extension 33 is provided on the upper part of the rear end 54 of the outer reinforcing member 50, extending rearward toward the front end 42f of the outer beam body 28. The extension 33 extends in a straight line along the outer transverse ridge 241 of the outer beam body 28 (see reference). Figure 4 ).

[0073] like Figure 4 As shown, the protrusion 33 includes: a longitudinal wall 34 extending rearward from the rear end 54 of the outer side reinforcement 51 of the outer reinforcement member 50; and an upper wall 35 extending rearward from the rear end 54 of the outer upper wall reinforcement 53 of the outer reinforcement member 50. The upper end of the longitudinal wall 34 and the upper wall 35 are integrally formed with the outer end of the upper wall 35 in the vehicle width direction, forming a generally L-shaped profile when viewed from a cross-sectional perspective orthogonal to the protrusion direction.

[0074] Both the longitudinal wall 34 and the upper wall 35 of the protrusion 33 extend behind the front end 42f of the outer beam main body 28. The longitudinal wall 34 of the protrusion is adjacent to the outer side surface 24b of the outer beam main body 28 from the inside of the closed section 10s (i.e., the inside in the vehicle width direction), and the upper wall 35 of the protrusion is adjacent to the outer upper side surface 22 of the outer beam main body 28 from the inside (i.e., the lower side) of the closed section 10s.

[0075] That is, the upper wall 35 of the protrusion 33 overlaps (engages) with the upper outer side 22 of the outer beam main body 28 from below, and the longitudinal wall 34 of the protrusion overlaps (engages) with the outer side 24b of the outer beam main body 28 from the inside in the vehicle width direction.

[0076] In addition, such as Figure 3 , Figure 4 As shown, the lower end of the protrusion 33 is positioned above the upper wall portion 44 of the outer protrusion 43 of the outer beam main body portion 28.

[0077] In addition, such as Figure 3 , Figure 4 , Figure 7 Especially Figure 7 As shown, the outer side portion 24b of the outer beam main body 28, excluding the outer protrusion 43 in the vertical direction, is located outside the vehicle width direction of the rear end 54 of the outer side reinforcement 51 of the outer reinforcement member 50. Meanwhile, in the outer protrusion 43 of the outer side reinforcement 51 of the outer beam main body 28, at least the longitudinal wall portion 45 is located inside the vehicle width direction of the rear end 54 of the outer side reinforcement 51 of the outer reinforcement member 50. Thus, as... Figure 7 As shown, the front ends 42f of the upper wall portion 44 and the lower wall portion 46 of the aforementioned outer protrusion 43 (refer to...) Figure 4 The rear end 54 of the outer side reinforcement 51 of the outer reinforcement member 50 overlaps with the rear end 54 of the outer side reinforcement 51 in the main view (see reference). Figure 7 Regions Z1 and Z2 in the middle.

[0078] In addition, such as Figure 3 , Figure 4 As shown, a horizontal reinforcing ridge 55 is formed at the rear and lower part of the outer side reinforcing portion 51 of the outer reinforcing member 50, extending continuously in a straight line from the rear end 54 of the outer reinforcing member 50 forward. Furthermore, as... Figure 4 As shown, the height of the transverse ridge 55 of the outer reinforcing member 50 is approximately the same as the lower transverse ridge 48 of the protrusion 43 of the outer beam body 28.

[0079] In addition, such as Figure 3 , Figure 4 As shown, a rear end recess 56, shaped like a groove, is formed at a position approximately at the same height as the upper transverse ridge 47 of the outer side protrusion 43 of the outer beam main body 28, below the protrusion 33 and above the transverse ridge 55 of the outer side reinforcing member 50. This rear end recess 56 opens toward the front end 42f of the outer beam main body 28.

[0080] In addition, such as Figure 3 , Figures 5-9 As shown, the inner beam 11 has an inner reinforcing member 60 and an inner transverse ridge reinforcing member 70 (see reference). Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 ).

[0081] An inner reinforcing member 60 is provided at the front end 17 of the inner beam to reinforce the front end 17 of the inner beam. The inner reinforcing member 60 is joined from the inside of the closed section 10s of the side beam 10 to the inner front side portion 171 and the inner front rear portion 172 of the front end 17 of the inner beam, and the two are connected in a strut-like manner.

[0082] Specifically, such as Figure 5 , Figure 6 , Figure 8 , Figure 9 As shown, the inner reinforcing member 60 includes: a front portion 61 of the inner reinforcing member, which extends horizontally in the vehicle width direction and can engage with the inner front side portion 171; a side portion 62 of the inner reinforcing member, which extends horizontally in the front-rear direction and can engage with the inner side portion 14; and a strut portion 63, which extends horizontally from the front end of the side portion 62 of the inner reinforcing member to the inner end of the front portion 61 of the inner reinforcing member in the vehicle width direction, and then extends outward in the vehicle width direction. The portion of the inner reinforcing member 60 that crosses the inner longitudinal ridge line 141 in the extension direction, namely the strut portion 63, is separated from the inner longitudinal ridge line 141 on the inner side of the closed section 10s.

[0083] The inner reinforcing member 60 has a reinforcing rib 64 protruding inward in the vehicle width direction at the middle position in the vertical direction. For example... Figure 5 , Figure 6 , Figure 9 As shown, the reinforcing rib 64 is continuously formed within at least the strut portion 63 in the extension direction of the inner reinforcing member 60, and in this example, it is continuously formed over the entire length in the extension direction. The inner reinforcing member 60 is formed to have higher strength than the outer reinforcing member 50.

[0084] in addition, Figure 9 This is a horizontal cross-sectional view obtained by cutting off the front end 31 of the side beam at the height of the reinforcing rib 64.

[0085] In addition, such as Figure 6 , Figure 8 As shown, the aforementioned inner transverse ridge reinforcement member 70 extends along the inner transverse ridge 142 located at the boundary between the inner upper side portion 12 and the inner side portion 14. Furthermore, the inner transverse ridge reinforcement member 70 has an inner reinforcing upper wall 71 and an inner reinforcing longitudinal surface 72, and the cross-section formed integrally at the inner end of the inner reinforcing upper wall 71 in the vehicle width direction and the upper end of the inner reinforcing longitudinal surface 72, orthogonal to the longitudinal direction, is formed into an L-shape.

[0086] The inner transverse ridge reinforcement member 70 joins the inner reinforcing upper wall 71 with the inner upper side surface 12 and the inner side surface 14 at the corner of the inner beam 11 and joins the inner reinforcing longitudinal surface 72 with the inner side surface 14, thereby reinforcing the inner transverse ridge 142 located at the boundary between the inner upper side surface 12 and the inner side surface 14.

[0087] like Figure 1 , Figure 2 As shown, the lower body structure 1 of the vehicle in this embodiment includes: a side beam 10 disposed on the outer side of the vehicle width direction at the lower part of the vehicle; and a wheel 6 located in front of the outer beam 21.

[0088] In the side beam 10, the inner side beam 11 located inside the vehicle width direction and the outer side beam 21 located outside the vehicle width direction together form a closed section 10s extending in the vehicle longitudinal direction (refer to...). Figure 3 In addition, the outer beam 21 has a front end portion 27 and a main body portion 28.

[0089] And, as Figures 3-5 , Figures 7-9 As shown, the lower body structure 1 of the vehicle in this embodiment includes an outer reinforcing member 50. The outer reinforcing member 50 has a shape with an outer front side portion 271 (front side portion) along the front end portion 27 of the outer beam (the front end portion of the outer beam 21) and an outer side side portion 24a (side portion) along the rear end portion 272 of the outer front end. The outer reinforcing member 50 is installed to the front end portion 27 of the outer beam from the inside of the closed section 10s, substantially overlapping with the front end portion 27 of the outer beam.

[0090] And, as Figure 3 , Figure 4 , Figure 9 As shown, in the lower body structure 1 of the vehicle in this embodiment, the front end 42f of the outer side portion 24b of the outer beam main body portion 28 and the rear end 54 of the outer side reinforcement portion 51 (side portion) of the outer reinforcement member 50 face each other in the vehicle front-rear direction.

[0091] And, as Figure 7 As shown, the outer side portion 24b of the outer beam main body portion 28 is characterized by having an outer protrusion 43, which is disposed on the outer side of the outer side reinforcement portion 51 of the outer reinforcement member 50 in the vehicle width direction (specifically, on the side of the outer side portion 24a of the outer beam front end portion 27) and protrudes inward in the vehicle width direction relative to the rear end 54 (on the side opposite to the side of the outer side portion 24a of the outer beam front end portion 27).

[0092] That is, the outer protrusion 43 is formed as the rear end 54 of the outer side reinforcement 51 that crosses the outer side reinforcement 50 in the vehicle width direction (see reference). Figure 7 ).

[0093] Therefore, when an impact load is input to the front end 31 of the side beam facing backward, the front end 42f of the outer protrusion 43 of the outer beam body 28 will engage with the rear end 54 of the retracting outer reinforcing member 50.

[0094] use Figure 10 Explain the function and effect of the lower body structure 1 of the above-mentioned vehicle.

[0095] Figure 10 Based on Figure 8 The D-D line arrow view section diagram shows the cross-sectional view of the front end 27 of the outer beam under impact load input during the simulation experiment. Furthermore, Figure 10 (a) Showing the initial stage of the collision, Figure 10 (b) Showing the mid-collision phase, Figure 10 (c) Showing the post-collision phase. The dots in this figure represent a picture of stress distribution; the denser the dots, the higher the stress (collision energy).

[0096] Wheel 6 retracts during a minor overlap collision. Figure 10 (The middle part is omitted) The main impact is on the front end 27 of the outer beam, thus as follows Figure 10 As shown in (a), a collision load directed toward the rear of the vehicle is input to the front end 27 of the outer beam. Here, since the front end 27 of the outer beam has an outer reinforcing member 50, it will maintain its shape while displacing rearward together with the outer reinforcing member 50.

[0097] Then as Figure 10 As shown in (b), the rear end 54 of the retracted outer reinforcing member 50 abuts against the front end 42f of the outer protrusion 43 provided on the outer beam body 28, thereby engaging with each other. Furthermore, Figure 10 (b) shows the state after the rear end 54 of the receding outer reinforcing member 50 and the front end 42f of the outer protrusion 43 have just come into contact.

[0098] Especially Figure 10 (b) region X1 and Figure 10 As shown in region X2 in (c), stress will concentrate at the part where the rear end 54 of the outer reinforcing member 50 engages with the front end 42f of the outer protrusion 43, and the load will be transmitted from the rear end 54 of the outer reinforcing member 50 to the front end 42f of the outer protrusion 43 provided in the outer beam body 28.

[0099] Therefore, as Figure 10 As shown in (c), the front end 27 of the outer beam can efficiently transfer the impact load through the outer reinforcement member 50 to the rear outer beam body 28 before it completely collapses due to the impact load input from the front.

[0100] Furthermore, even if the outer reinforcing member 50 is not located behind the front end 27 of the outer beam 21, it can still efficiently transfer the collision load input from the front to the rear using the rearward outer beam body 28, thus suppressing the increase in mass and cost.

[0101] Therefore, the impact load from the front end 31 of the input side beam can be efficiently transferred to the rear of the side beam 10 without increasing mass or cost.

[0102] like Figures 3-5 , Figure 7 , Figure 8 As shown, in the embodiment of the present invention, the outer side reinforcement 51 of the outer reinforcement member 50 is provided with an extension 33 extending rearward toward the front end 42f of the outer beam main body 28.

[0103] According to the technical solution, when the impact load on the front end 31 of the input side beam facing the rear of the vehicle causes the outer reinforcing member 50 to retract, the protrusion 33 can engage with the outer side portion 24b (side portion) of the outer beam main body 28 in the vehicle width direction, thereby restricting the relative movement of the outer reinforcing member 50 relative to the outer beam main body 28 in the vehicle width direction.

[0104] This allows the rear end 54 of the retracted outer reinforcing member 50 to engage more securely with the front end 42f of the outer protrusion 43 provided on the outer beam body 28, thereby improving the efficiency of load transfer from the outer reinforcing member 50 to the outer beam body 28.

[0105] As a form of the present invention, such as Figure 3 , Figure 4 , Figure 8 , Figure 9 As shown, the outer protrusion 43 is formed as a reinforcing rib that extends continuously in the front-back direction from the outer beam body 28.

[0106] As described above, the outer protrusion 43 is formed into a reinforcing rib, thereby improving the efficiency of the outer beam body 28 in transmitting loads in the front-rear direction.

[0107] like Figure 4 As shown, in the outer side reinforcement 51 of the outer reinforcement member 50, the horizontal ridge line 55 of the reinforcement member extending continuously forward from the rear end 54 is formed at approximately the same height as the lower side horizontal ridge line 48 (protrusion horizontal ridge line) of the protrusion extending forward and backward in the outer protrusion 43.

[0108] According to the technical solution, when an impact load is input to the front end 31 of the side beam facing rearward, the outer reinforcing member 50 will retract, thereby... Figure 10As shown in (b) and (c), the horizontal ridge line 55 of the reinforcing member and the horizontal ridge line 48 of the protrusion on the lower side are continuous in the longitudinal direction of the vehicle.

[0109] In other words, the rear end 54 of the outer side reinforcement 51 of the outer reinforcing member 50, whose rigidity is increased by the transverse ridge line 55 of the reinforcing member, will firmly engage (abut) with the front end 42f of the outer protrusion 43 of the outer beam body 28, whose rigidity is increased by the lower transverse ridge line 48 of the protrusion. Therefore, the efficiency of load transfer from the outer reinforcing member 50 to the outer beam body 28 can be improved.

[0110] As a form of the present invention, such as Figure 4 , Figure 7 As shown, the outer upper side portion 22 and the outer side portion 24b of the outer beam main body 28 form an outer transverse ridge 241 extending in the front-rear direction, as... Figure 3 , Figure 4 , Figure 7 , Figure 8 As shown, the protrusion 33 extends rearward along the outer transverse ridge 241 in a manner that allows it to engage with the outer upper side portion 22 and the outer side portion 24b of the outer beam main body portion 28.

[0111] According to the technical solution, when the rearward impact load of the front end 31 of the input side beam causes the outer reinforcing member 50 to retract, the protrusion 33 will not only engage with the outer side surface 24b of the outer beam main body 28, but also with the outer upper side surface 22. This not only restricts the relative movement of the outer reinforcing member 50 relative to the outer beam main body 28 in the vehicle width direction, but also restricts its relative movement in the vertical direction.

[0112] This prevents the relative height of the horizontal ridge line 55 of the reinforcing member and the lower horizontal ridge line 48 of the protrusion from shifting when the outer reinforcing member 50 moves backward, thereby making the horizontal ridge line 55 of the reinforcing member and the lower horizontal ridge line 48 of the protrusion more reliably continuous in the front-rear direction of the vehicle.

[0113] As a form of the present invention, such as Figure 3 , Figure 4 , Figure 7 As shown, the outer protrusion 43 has an upper wall portion 44 and a lower wall portion 46 (paired transverse wall portions) that are separated from each other in the vertical direction of the vehicle and extend in the width direction of the vehicle, such as Figure 7 As shown, both the upper wall portion 44 and the lower wall portion 46 overlap with the rear end 54 of the outer reinforcing member 50 in the vehicle's main view (see reference). Figure 7 Regions Z1 and Z2 in the middle.

[0114] According to the technical solution, since the upper wall portion 44 and the lower wall portion 46 overlap with the rear end portion 54 of the outer reinforcing member 50 in the vehicle's main view, when an impact load is input to the front end portion 31 of the side beam, the rear end portion 54 of the retracting outer reinforcing member 50 can be reliably engaged (aggregated) with the front end portion 42f of the outer protrusion 43 of the outer beam body portion 28.

[0115] Therefore, it can improve the efficiency of load transfer from the outer reinforcing member 50 to the outer beam body 28.

[0116] As a form of the present invention, such as Figure 3 , Figure 4 , Figure 10 As shown in (a), at least a portion of the upper wall portion 44 provided with the outer protrusion 43 in the outer reinforcing member 50 is formed at a height that is consistent with the height in the vertical direction, and a rear end recess 56 is formed that is recessed forward from the rear end 54.

[0117] According to the aforementioned technical solution, when the impact load on the front end 31 of the input side beam, directed towards the rear of the vehicle, causes the outer reinforcing member 50 to retract, such as Figure 10 As shown in (b), the periphery of the rear recess 56 engages with the upper wall portion 44 provided with the outer protrusion 43.

[0118] Therefore, the rear end 54 of the retracted outer reinforcing member 50 is more securely engaged with the outer protrusion 43 provided on the outer beam body 28, thereby improving the efficiency of load transfer from the outer reinforcing member 50 to the outer beam body 28.

[0119] As a form of the present invention, such as Figure 2 As shown, the boundary between the front end 27 of the outer beam and the main body 28 of the outer beam in the front-back direction is located between the front and back widths of the hinge column 7 extending upward from the side beam 10.

[0120] According to the technical solution, the lower part of the hinge column 7 is connected to the front end 27 of the outer side beam and the main body 28 of the outer side beam and the side beam 10. Therefore, when an impact load is input to the front end 31 of the side beam in the rearward direction, the load can be transferred more effectively from the front end 31 of the side beam to the main body 28 of the outer side beam located at the rear of the vehicle.

[0121] Furthermore, in the above embodiments, such as Figures 3-5 , Figures 7-9 As shown, the outer reinforcing member 50 is fitted to the front end 27 of the outer beam from the inside of the closed section 10s.

[0122] According to the described technical solution, compared to the case where the outer reinforcing member 50 is fitted onto the front end 27 of the outer beam from the outside of the closed section 10s, the outer reinforcing member 50 can be made compact and simple in shape, thus suppressing the increase in weight. Furthermore, even when the outer reinforcing member 50 is formed by molding, compared to the case where the outer reinforcing member 50 is fitted onto the front end 27 of the outer beam from the outside of the closed section 10s, no stretching material is required, thus making it easier to mold.

[0123] However, the present invention is not limited to the above-described embodiments. For example, it is also possible to equip the outer reinforcing member 50 on the front end 27 of the outer beam from the outside of the closed section 10s. This scheme is omitted from the illustration.

[0124] At this time, the protrusion 33 is also positioned on the outside of the closed section 10s relative to the outer beam main body 28. Furthermore, the outer protrusion 43 protrudes outward from the outside of the closed section 10s relative to the outer beam main body 28. Specifically, the outer protrusion 43 protrudes from the side of the front end 27 of the outer beam towards the side opposite to the side of the front end 27 of the outer beam (outer side in the vehicle width direction) relative to the rear end 54 of the outer side reinforcement 51 of the outer reinforcement member 50.

[0125] As described above, the present invention is not limited to the technical solutions of the above embodiments, and can be formed through various implementation methods.

[0126] Numbering Explanation 1…The lower body structure of the vehicle 6…wheels 7… Hinge Column 10…Side beam 10s… Closed section 11…Inner Beam 21…Outer beam 22…Outer upper side (upper side of the main body) 24a(24)...the outer side of the front end of the outer beam (the side of the front end of the outer beam) 24b(24)...The outer side of the main body of the outer beam (the side of the main body of the outer beam) 27… Front end of the outer beam (front end of the outer beam) 28…Main body of the outer beam (Main body of the outer beam) 33…protruding part 42f… Front end of the outer beam main body (front end of the main body) 43… Lateral protrusion (protrusion) 44, 46… The upper and lower walls of the outer protrusions (paired transverse walls) 45…Longitudinal wall section 48… Lower transverse ridge line of the protrusion (transverse ridge line of the protrusion) 50…Outer reinforcing member 51…The outer side reinforcement of the outer reinforcing member (the side part of the outer reinforcing member) 54… Rear end of the outer reinforcing member 55… Transverse ridge line of reinforcing member 56… Rear end recess 241…outer transverse edge line 271…Outer front side (outer side of the outer beam)

Claims

1. A lower body structure for a vehicle, characterized in that... include: The side beam is located on the lower part of the vehicle and on the outer side in the vehicle width direction. It is formed by the inner side beam located on the inner side in the vehicle width direction and the outer side beam located on the outer side in the vehicle width direction, which has a front end and a main body, forming a closed section extending in the vehicle longitudinal direction. The wheel is located in front of the outer beam; The outer reinforcing member has the shape of a front side portion and a side portion along the front end portion of the outer beam; The outer reinforcing member is installed from the inside of the closed section or the outside of the closed section to the front end. The front end of the main body and the rear end of the side portion of the outer reinforcing member face each other in the vehicle's longitudinal direction. The main body has a protrusion that is disposed on one side of the side portion of the front end relative to the rear end of the side portion of the outer reinforcing member in the vehicle width direction, and protrudes relative to the rear end to the side opposite to the side portion of the front end.

2. The lower body structure of the vehicle according to claim 1, characterized in that: An extension portion is provided on the side portion of the outer reinforcing member, extending rearward toward the front end of the main body.

3. The lower body structure of the vehicle according to claim 2, characterized in that: The protrusion is formed by a reinforcing rib extending in the front-rear direction on the main body.

4. The lower body structure of the vehicle according to claim 3, characterized in that: In the side portion of the outer reinforcing member, a transverse ridge of the reinforcing member extending continuously forward from the rear end is formed at approximately the same height as the transverse ridge of the protrusion extending in the forward-backward direction in the protrusion.

5. The lower body structure of the vehicle according to claim 4, characterized in that: An outer transverse ridge line extending from the front end of the main body is formed at the boundary between the upper side portion and the side portion of the main body. The protrusion extends rearward along the outer transverse ridge in a manner that allows it to engage with the upper and side portions of the main body.

6. The lower body structure of the vehicle according to claim 5, characterized in that: The protrusion has a pair of transverse wall portions that are separated from each other in the vertical direction of the vehicle and extend in the width direction of the vehicle; In the pair of transverse wall portions, at least one transverse wall portion overlaps with the rear end of the outer reinforcing member in the vehicle's main view.

7. The lower body structure of the vehicle according to claim 6, characterized in that: At a location in the outer reinforcing member where at least one of the paired transverse wall portions of the protrusion is at the same height, a rear end recess is formed that is recessed forward from the rear end.

8. The lower body structure of the vehicle according to claim 1, characterized in that: The outer reinforcing member is fitted onto the front end from the inside of the closed section.

9. The lower body structure of the vehicle according to any one of claims 1 to 8, characterized in that: The front end of the outer beam and the boundary of the main body in the vehicle longitudinal direction are located between the front and rear widths of the hinge column extending upward from the side beam.

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