Front lower body structure of the vehicle with improved rigidity

Abstract

This invention discloses a front lower body structure for a vehicle with improved rigidity, the front lower body structure comprising: a front rear lower member, a central floor side upper member, and a reinforcing bracket, the front rear lower member being connected from a front member arranged on one side of a fender to the interior of a longitudinal beam; the central floor side upper member being arranged in the longitudinal direction of the vehicle and extending from the upper surface of the front bulkhead to the central floor panel; the reinforcing bracket connecting the front rear lower member to the central floor side upper member.

Description

Technical Field

[0001] This invention relates to a front lower body structure of a vehicle with improved rigidity. Background Technology

[0002] like Figure 1 and Figure 2 As shown, in a vehicle equipped with an internal combustion engine, the load is distributed from the front side member 112 of the fender 111 toward the central floor panel 114 to the central floor side member 116 and the interior of the longitudinal beam 117, in order to transfer the load to its rear side (see [reference]). Figure 1 (See arrow shown in the image). The load input to the front member 112 is distributed to the central floor side member 116 and the interior of the longitudinal beam 117, and is transferred to the rear of the vehicle, thereby ensuring sufficient stiffness to resist a collision. In addition, vehicles equipped with an internal combustion engine form a central tunnel 118, such that the central floor panel 114 has an exhaust pipe or the like mounted on its central portion, which also contributes to improving stiffness.

[0003] However, as Figure 4 As shown, the electric vehicle houses the high-voltage battery B within the space between the minimum ground clearance and the central floor panel 114, ensuring as much space as possible for the high-voltage battery B. According to this configuration, since the electric vehicle does not have a central floor side member 116, most of the load input to the front side member 112 is transferred to the interior of the longitudinal beam 117 via the front rear lower member 113 (see...). Figure 3 Due to the simplified load transfer path, it is difficult to ensure sufficient stiffness. The upper member 115 on the central floor side is present on the upper surface of the central floor panel 114, but the load transferred from the upper member 115 is negligible compared to the load transferred through the central floor side member 116 (see [link to relevant documentation]). Figure 7 (as shown by the dashed arrow in the diagram), and is substantially transferred to the interior 117 of the longitudinal beam via the front rear lower member 113.

[0004] As mentioned above, the simplified load path and the concentration of load on the interior of the longitudinal beam 117 reduce impact performance and durability, and are also detrimental to noise, vibration, and roughness (NVH).

[0005] The rear end of the vehicle's front subframe 120 is fastened to the front side member 112 via a rear mounting bracket 119. That is, as... Figure 5As shown, the front subframe rear mounting bracket 119 is welded to the front lower rear member 113 formed on the rear of the front member 112, thereby securing the front subframe 120 to the front subframe rear mounting bracket 119. However, while the front subframe rear mounting bracket 119 can be located on a load path that concentrates and transmits loads, thus sufficiently ensuring stiffness in the longitudinal direction of the front lower rear member 113, it is difficult to ensure sufficient stiffness in the normal direction of the front lower rear member 113, and the movement in the normal direction is relatively large (see...). Figure 6 This inevitably leads to negative consequences even for NVH performance.

[0006] Furthermore, recently developed electric vehicles have also abandoned the central tunnel 118, instead employing sliding structures for the console and seats to provide passengers with convenient movement within the vehicle and a comfortable environment for rest. However, this is detrimental to ensuring rigidity in the fore-and-aft direction.

[0007] The descriptions in this section are intended to aid in understanding the background of the invention and may include content previously unknown to those skilled in the art. Summary of the Invention

[0008] This invention relates to a front lower body structure for a vehicle with improved stiffness. Specific embodiments relate to a front lower body structure for a vehicle with improved stiffness that increases the vehicle's stiffness in the longitudinal direction in vehicles with a flat central floor panel (such as electric vehicles), thereby improving crash performance, durability, and NVH performance.

[0009] This invention can solve the problems in related technologies, and embodiments of this invention provide a front lower body structure for vehicles with improved rigidity, which distributes the load input to the front of the vehicle to the front bulkhead and the central floor side through the upper component on the central floor side, rather than concentrating it on the longitudinal beam side, thereby improving collision performance, durability and NVH performance.

[0010] According to an embodiment of the present invention, a front lower body structure of a vehicle with improved rigidity includes: a front rear lower member, a central floor side upper member, and a reinforcing bracket, wherein the front rear lower member is connected from a front member formed on one side of a fender to the interior of a longitudinal beam; the central floor side upper member is formed in the longitudinal direction of the vehicle to extend from the upper surface of the front bulkhead to the central floor panel; and the reinforcing bracket connects the front rear lower member to the central floor side upper member.

[0011] A reinforcing groove is formed in the direction in which the front lower rear component and the central floor upper component are connected to the reinforcing bracket.

[0012] One end of the reinforcing bracket is attached to the rear mounting bracket of the front subframe, which secures the front subframe to the lower front rear component, and the other end of the reinforcing bracket is attached to the upper central floor component.

[0013] The reinforcing bracket includes a main body, a reinforcing groove, and a flange. The reinforcing groove is formed in a stepped shape with respect to the main body, and the flange is formed along the circumference of the main body.

[0014] The flange portion includes a first flange portion, a second flange portion, and a third flange portion. The first flange portion is formed on one side of the main body portion and is attached to the front rear lower component. The second flange portion is attached to the central floor side upper component. The third flange portion connects the first flange portion and the second flange portion along the circumference of the main body portion.

[0015] The reinforcing groove is formed in a stepped shape with respect to the main body, so that it extends from the main body into the interior of the reinforcing support.

[0016] The first flange is welded to at least one of the front rear lower component and the rear mounting bracket of the front subframe.

[0017] The second flange is welded to the front bulkhead and the upper side component of the central floor through a three-layer structure.

[0018] According to an embodiment of the present invention, the front lower body structure of a vehicle with improved rigidity, having the above-described structure, distributes the load input from the front bulkhead to the front side member sufficiently from the front rear lower member through the reinforcing bracket to the central floor side upper member formed on the central floor panel, rather than concentrating it inside the longitudinal beams.

[0019] As mentioned above, the load is also distributed and transferred toward the upper components on the central floor side, rather than concentrated inside the longitudinal beams, thereby increasing stiffness to improve crash performance, durability, and NVH performance. Attached Figure Description

[0020] Figure 1 This is a bottom schematic diagram showing the front lower body structure of a vehicle equipped with an internal combustion engine according to related technologies.

[0021] Figure 2 It is along Figure 1 The cross-sectional view obtained by line AA is shown in the figure.

[0022] Figure 3 This is a bottom schematic diagram showing the front lower body structure of an electric vehicle according to related technologies.

[0023] Figure 4 It is shown along Figure 3 The cross-sectional view shown in the figure shows the state of the high-voltage battery installed on the cross-section obtained by line BB.

[0024] Figure 5 This is a bottom perspective view showing the portion of an electric vehicle in which a front subframe is installed, according to relevant technology.

[0025] Figure 6 It is along Figure 5 The cross-sectional view obtained by line CC is shown in the figure.

[0026] Figure 7 This is a bottom perspective view showing the load passage in the front lower body structure of an electric vehicle according to related technologies.

[0027] Figure 8 This is a bottom perspective view showing the application of a front lower body structure with improved rigidity according to an embodiment of the present invention in the part of the vehicle in which the front subframe is installed.

[0028] Figure 9 This is a bottom perspective view showing a reinforcing bracket in the front lower body structure of a vehicle with improved rigidity according to an embodiment of the present invention.

[0029] Figure 10 It is along Figure 8 The cross-sectional view obtained by line DD is shown in the figure.

[0030] Figure 11 It is along Figure 8 The cross-sectional view of line EE is shown in the figure.

[0031] Figure 12 This is a bottom perspective view showing the load passage in the front lower body structure of a vehicle with improved rigidity according to an embodiment of the present invention.

[0032] Figure 13 This is a bottom perspective view showing a portion of the welded reinforcing bracket in the front lower body structure of a vehicle with improved rigidity according to an embodiment of the present invention. Detailed Implementation

[0033] In the following description, a front lower body structure of a vehicle with improved rigidity according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0034] like Figures 8-13 As shown, a front lower body structure of a vehicle with improved rigidity according to an embodiment of the present invention includes: a front rear lower member 13, a central floor side upper member 15, and a reinforcing bracket 22. The front rear lower member 13 is connected from a front member 12 formed on one side of a fender 11 to the interior of a longitudinal beam 17. The central floor side upper member 15 is formed in the longitudinal direction of the vehicle to extend from the upper surface of the front bulkhead 21 to the central floor panel 14. The reinforcing bracket 22 connects the front rear lower member 13 to the central floor side upper member 15.

[0035] The front lower body structure of the vehicle according to an embodiment of the present invention is preferably used for electric vehicles in which a center panel 18 is not formed on the central floor panel 14.

[0036] A front component 12 is formed on one side of the mudguard 11 along the longitudinal direction of the vehicle.

[0037] The front rear lower member 13, formed at the rear of the front member 12, is connected to the longitudinal beam side of the vehicle, that is, the interior of the longitudinal beam 17. Since the front member 12 is located inside the fender 11 and the interior of the longitudinal beam 17 is located at the side end of the vehicle, the front rear lower member 13 is arranged to slope from the front inner side of the vehicle toward the rear outer side of the vehicle.

[0038] A central floor side upper member 15 is formed in the longitudinal direction of the vehicle to extend from the upper surface of the front bulkhead 21 to the central floor panel 14.

[0039] The reinforcing bracket 22 is configured such that the load transmitted from the front rear lower member 13 to the interior of the longitudinal beam 17 is distributed to the central floor side upper member 15. The reinforcing bracket 22 connects the front rear lower member 13 to the central floor side upper member 15 to form a path for transmitting the load from the front rear lower member 13 toward the central floor side upper member 15 and the interior of the longitudinal beam 17, thereby generating load distribution.

[0040] In electric vehicles, to ensure the installation of high-voltage battery B ( Figure 4 The space shown, the central floor side member (e.g., Figure 1 The central floor side member 116 does not extend from the front bulkhead 21 to the central floor panel 14, thus preventing load distribution from the front rear lower member 13 via the central floor side member. Furthermore, due to the absence of a central passageway (e.g., Figure 1 The central passage (118) inevitably weakens the strength in the front and rear directions.

[0041] Therefore, the reinforcing bracket 22 is configured such that loads in the front-rear direction are transferred from the front rear lower member 13 to the central floor side upper member 15 formed in the electric vehicle.

[0042] like Figure 9As shown, the reinforcing bracket 22 includes a main body 22a, a reinforcing groove 22b, and a flange. The reinforcing groove 22b is formed in a stepped shape with the main body 22a. The flange is formed along the circumference of the main body 22a. Here, the flange includes a first flange 22c, a second flange 22d, and a third flange 22e. The first flange 22c is formed on one side of the main body 22a and is connected to the front rear lower member 13. The second flange 22d is connected to the central floor side upper member 15. The third flange 22e connects the first flange 22c and the second flange 22d along the circumference of the main body 22a.

[0043] The main body 22a is formed of a metal plate to form a load passage from the front rear lower member 13 to the central floor side upper member 15.

[0044] A reinforcing groove 22b is formed in the middle portion of the main body 22a in a stepped shape. The reinforcing groove 22b is formed to extend from the front member 12 toward the interior of the vehicle. A path for transmitting load is formed along the direction in which the reinforcing groove 22b is formed.

[0045] At this time, the reinforcing groove 22b is formed in a stepped manner from the main body 22a toward the inner side of the reinforcing bracket 22, thereby making the cross-sectional shape perpendicular to the load passage curved (see...). Figure 11 Therefore, the reinforcing bracket 22 can adequately support the load transmitted from the front subframe rear mounting bracket 19 to the upper component 15 on the central floor side.

[0046] The load input from the front of the vehicle is transmitted along the front rear lower member 13, and then a portion of the load (see...) Figure 12 The solid arrow shown in the image transmits the load from the rear mounting bracket 19 of the front subframe to the interior of the longitudinal beam 17, and the rest (see [reference]). Figure 12 (The dashed arrow shown in the figure) transfers the load to the upper component 15 on the central floor side through the reinforcing bracket 22, so that the load is properly distributed and not concentrated on the interior of the longitudinal beam 17.

[0047] like Figure 12 As shown, the load transmitted from the front of the vehicle to the front rear lower component 13 is distributed from the rear mounting bracket 19 of the front subframe to the interior of the longitudinal beams 17 and the upper component 15 on the central floor side (the load transmitted to the interior of the longitudinal beams 17 is shown by solid lines, while the load transmitted to the upper component 15 on the central floor side is shown by dashed lines). As described above, the load can be distributed and transmitted, rather than concentrated on a specific path, thereby increasing the rigidity of the vehicle's lower structure through the reinforcing bracket 22.

[0048] Figure 13This illustrates the relationship between the reinforcing bracket 22 and another adjacent component, which is connected by welding. The reinforcing bracket 22 is connected to another adjacent component by welding in the connected state.

[0049] The first welded portion W11 allows the first flange portion 22c to be welded to the rear mounting bracket 19 of the front subframe in the middle portion of the first flange portion 22c by plug welding.

[0050] The second weld portion W12 welds the front rear lower component 13 to the reinforcing bracket 22. The second weld portion W12 is located on the first flange portion 22c. At this time, the second weld portion W12 is positioned higher than the fourth weld portion W21. That is to say, Figure 13 The bottom surface of the above structure is shown, and the second welded part W12 is shown to be located at a lower position than the fourth welded part W21, but in the actual vehicle, the second welded part W12 is located at a higher position than the fourth welded part W21.

[0051] The third weld portion W13 allows the reinforcing bracket 22 to be welded to the front bulkhead 21. The third weld portion W13 may be located in the second flange portion 22d on the portion of the main body portion 22a located at the rear of the vehicle.

[0052] The fourth welding part W21 allows the reinforcing bracket 22 to be welded to the rear mounting bracket 19 of the front subframe and the front rear lower component 13. The reinforcing bracket 22 can be welded to the rear mounting bracket 19 of the front subframe and the front rear lower component 13 at both ends of the first flange 22c in the longitudinal direction of the vehicle.

[0053] The fifth weld portion W22 welds the reinforcing bracket 22 to the upper component 15 on the central floor side and the front bulkhead 21. The second flange portion 22d is welded to the upper component 15 on the central floor side and the front bulkhead 21 located on one side of the reinforcing bracket 22 inside the vehicle. At this time, the fifth weld portion W22 is preferably welded to form at multiple points, thereby enhancing the bonding strength.

[0054] The sixth welded part W23 has a reinforcing bracket 22 that is combined with the front rear lower member 13 and the front bulkhead 21. The second flange portion 22d located at the front of the vehicle from the main body portion 22a is welded to the front member 12 and the front bulkhead 21 to form the sixth welded part W23.

[0055] The seventh weld portion W31 allows the reinforcing bracket 22 to be welded to the front rear lower member 13, the central floor side upper member 15, and the front bulkhead 21. The seventh weld portion W31 can be located on the portion of the reinforcing bracket 22 where the first flange portion 22c and the second flange portion 22d connect. Specifically, the seventh weld portion W31 can be located on the portion where the first flange portion 22c and the second flange portion 22d connect to the main body portion 22a at the rear of the vehicle.

[0056] Meanwhile, the first welding part W11 is welded by plug welding, and the second welding part W12 is welded to the seventh welding part W31 by spot welding.

Claims

1. A front lower body structure of a vehicle, comprising: The front rear lower component connects to the interior of the longitudinal beam from the front component arranged on one side of the mudguard; The upper side member of the central floor is arranged in the longitudinal direction of the vehicle and extends from the upper surface of the front bulkhead to the central floor panel. as well as A reinforcing bracket connects the lower rear section of the front panel to the upper central floor section. The reinforcing bracket includes a main body and a flange, the flange being formed along the circumference of the main body, and the flange comprising: The first flange is formed on one side of the main body and is attached to the front rear lower part member; The second flange portion, which is joined to the upper component on the central floor side; and The third flange connects the first flange and the second flange along the circumference of the main body.

2. The front lower body structure of the vehicle according to claim 1, further comprising a reinforcement groove arranged in the direction in which the front rear lower component and the central floor side upper component are connected to the reinforcement bracket.

3. The front lower body structure of the vehicle according to claim 1, wherein: The first end of the reinforcing bracket is connected to the rear mounting bracket of the front subframe, and the rear mounting bracket of the front subframe secures the front subframe to the front rear lower component. The second end of the reinforcing bracket is attached to the upper component on the central floor side.

4. The front lower vehicle body structure of a vehicle according to claim 1, wherein The reinforcing bracket further includes a reinforcing groove, which is formed in a stepped shape with the main body.

5. The front lower vehicle body structure of a vehicle according to claim 1, wherein The first flange is welded to at least one of the front rear lower component or the rear mounting bracket of the front subframe.

6. The front lower body structure of the vehicle according to claim 1, wherein, The second flange is welded to the front bulkhead and the upper part of the central floor via a three-layer structure.

7. The front lower body structure of the vehicle according to claim 4, wherein, The reinforcing groove is formed in a stepped manner with the main body, pointing from the main body into the interior of the reinforcing bracket.

8. A vehicle comprising: The front rear lower component connects to the interior of the longitudinal beam from the front component arranged on one side of the mudguard; The upper side member of the central floor is arranged in the longitudinal direction of the vehicle and extends from the upper surface of the front bulkhead to the central floor panel. as well as A reinforcing bracket that connects the front rear lower component to the central floor side upper component, the reinforcing bracket comprising: The main body includes a metal plate; The reinforcing groove is formed in a stepped shape with respect to the main body; and A flange portion is formed along the circumference of the main body portion. The flange portion includes: The first flange is formed on one side of the main body and is attached to the front rear lower part member; The second flange portion, which is joined to the upper component on the central floor side; and The third flange connects the first flange and the second flange along the circumference of the main body.

9. The vehicle according to claim 8, wherein, The reinforcement groove is arranged in the direction in which the front lower rear component and the central floor upper component are connected to the reinforcement bracket.

10. The vehicle according to claim 8, wherein: The first end of the reinforcing bracket is connected to the rear mounting bracket of the front subframe, and the rear mounting bracket of the front subframe secures the front subframe to the front rear lower component. The second end of the reinforcing bracket is attached to the upper component on the central floor side.

11. The vehicle according to claim 8, wherein, The first flange is welded to at least one of the front rear lower component or the rear mounting bracket of the front subframe.

12. The vehicle according to claim 8, wherein, The second flange is welded to the front bulkhead and the upper part of the central floor via a three-layer structure.

13. The vehicle according to claim 8, wherein, The reinforcing groove is formed in a stepped shape relative to the main body, pointing from the main body into the interior of the reinforcing bracket.

14. A method for forming a front lower body structure of a vehicle, the method comprising: The front rear lower component is connected to the interior of the longitudinal beam from the front component arranged on one side of the mudguard; The upper side component of the central floor is arranged in the longitudinal direction of the vehicle and extends from the upper surface of the front bulkhead to the central floor panel. The front and lower rear components are connected to the upper side component of the central floor using reinforcing brackets. The reinforcing bracket includes: Main body; The reinforcing groove is formed in a stepped shape with respect to the main body; and A flange portion formed along the circumference of the main body portion, wherein the flange portion includes: The first flange is formed on one side of the main body and is attached to the front rear lower part member; The second flange portion, which is joined to the upper component on the side of the central floor; and The third flange connects the first flange and the second flange along the circumference of the main body.

15. The method for forming the front lower body structure of a vehicle according to claim 14, further comprising: The first end of the reinforcing bracket is attached to the rear mounting bracket of the front subframe, and the rear mounting bracket of the front subframe secures the front subframe to the front rear lower component. The second end of the reinforcing bracket is attached to the upper component on the central floor side.

16. The method for forming the front lower body structure of a vehicle according to claim 14, further comprising: The first flange portion is welded to at least one of the front rear lower component or the rear mounting bracket of the front subframe; The second flange is welded to the front bulkhead and the upper part of the central floor via a three-layer structure.

17. The method for forming the front lower body structure of a vehicle according to claim 14, wherein, The reinforcing groove is formed in a stepped shape relative to the main body, pointing from the main body into the interior of the reinforcing bracket.

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