KR102175959B1 - Subframe mounting structure for vehicle - Google Patents

Abstract

The present invention is a vehicle subframe mounting structure disposed on a vehicle body structure having a pair of side members and a cross member connecting the pair of side members, and is mounted on each side member, so that the subframe is fixed to the side member side. Configured fastening member; And at least one bulkhead configured to form a load path between the fastening member and the sidewall of the side member by connecting the fastening member and the side member.

Description

Vehicle subframe mounting structure {SUBFRAME MOUNTING STRUCTURE FOR VEHICLE}

The present invention relates to a vehicle sub-frame mounting structure, and more particularly, to a vehicle sub-frame mounting structure that can significantly enhance the rigidity of the input point.

In general, a vehicle body is composed of a main frame and a sub-frame, and the sub-frame is composed of a front sub-frame connected to the lower front of the vehicle body and a rear sub-frame connected to the rear lower part of the vehicle body.

The front subframe supports the engine, transmission, and suspension, and serves to facilitate load transfer while securing the rigidity of the front structure of the vehicle. The rear subframe supports the rear axle, rear suspension, etc., and serves to facilitate load transfer by securing the rigidity of the rear structure of the vehicle.

A conventional subframe mounting structure includes a fastening member that fixes the subframe to a side member of a vehicle body, and a cap-covered bulkhead that supports the fastening member. The cap-covered bulkhead has a hexahedral structure and is configured to support the load along the X direction (the length of the vehicle), the Y direction (the width direction of the vehicle), and the Z direction (the height direction of the vehicle).

However, in the conventional cap-covered bulkhead, stiffness at mounting points depends on the thickness of each surface, and since each support surface is offset from the center point of the load, the input point stiffness is weak. In particular, the cap-covered bulkhead has a disadvantage in that its rigidity is very weak compared to the X and Z directions because there is no direct support surface in the Y direction.

In order to overcome the shortcomings of the cap-covered bulkhead, a Y-direction reinforced bulkhead has been released that adds a support surface for supporting the Y-direction load. However, as the Y-direction reinforced bulkhead supports the X-direction load and the Z-direction load by a cantilevered structure, the rigidity in the X-direction and Z-direction is weak.

In addition, in order to overcome the shortcomings of the Y-direction reinforced bulkhead, a support surface that supports the Y-direction load and the X-direction reinforced bulkhead extending the length in the Z-direction have been released. By penetrating through the floor, it reinforces the rigidity against the load in the X direction. The X-direction reinforced bulkhead is mainly used for the rear subframe of rear-wheel drive vehicles. However, as the X-direction reinforced bulkhead penetrates the floor, it has several problems such as watertightness, inflow of exhaust gas, deterioration in appearance quality, and quality of C02 welding.

The matters described in this background are prepared to enhance an understanding of the background of the invention, and may include matters other than the prior art already known to those of ordinary skill in the field to which this technology belongs.

The present invention was devised in consideration of the above points, and an object of the present invention is to provide a vehicle subframe mounting structure capable of securing input point stiffness and sufficiently securing assembling property, watertightness, weldability, and the like.

The present invention for achieving the above object is a vehicle subframe mounting structure disposed on a vehicle body structure having a pair of side members and a cross member connecting the pair of side members,

A fastening member mounted on each side member and configured to fix the subframe to the side member side; And

And at least one bulkhead configured to form a load path between the fastening member and the side wall of the side member by connecting the fastening member and the side member.

The bulkhead may include a first coupling portion coupled to the fastening member, a second coupling portion coupled to a sidewall of the side member, and a support portion extending from the first coupling portion to the second coupling portion.

The support may extend in a diagonal direction between the fastening member and the side wall of the side member.

It further includes a lower panel supporting the fastening member and the bulk head, and the lower panel may be coupled to the side member.

The lower panel may have a base and a pair of flanges formed on both sides of the base.

The base of the lower panel may be coupled to a bottom wall of the side member, and each flange of the lower panel may be coupled to a side wall of the side member.

The second coupling portion may have an upper coupling surface coupled to a side wall of the side member and a lower coupling surface coupled to a flange of the lower panel.

The upper coupling surface may be offset from the lower coupling surface toward the sidewall of the side member.

The support may extend parallel to the transverse wall of the cross member.

The center of the fastening member and any of the cross members of the cross member may be aligned in a line.

The second coupling portion may be aligned so as to be located on the same line with each of the cross members of the cross member.

According to the present invention, the bulkhead can implement a continuous load path between the fastening member and the side member by directly connecting the fastening member and the side member to which the subframe is fastened, through which X-direction support stiffness This can be increased, and in particular, since the Y-direction input point stiffness is greatly strengthened, not only can the load noise be significantly improved, but the durability index thereof can be greatly improved.

1A is a perspective view showing a vehicle subframe mounting structure according to a first embodiment of the present invention.
FIG. 1B is a front view illustrating a state in which a second coupling part of a bulkhead of the vehicle subframe mounting structure of FIG. 1A and a lower panel are mounted on side members.
2 is an exploded perspective view showing a state in which the bulk head, the fastening member, and the lower panel of the vehicle subframe mounting structure according to the first embodiment of the present invention are disassembled.
3 is a combined perspective view showing a state in which a bulkhead, a fastening member, and a lower panel of the vehicle subframe mounting structure according to the first embodiment of the present invention are combined.
4 is a plan view showing a vehicle subframe mounting structure according to a first embodiment of the present invention.
5 is a perspective view showing a vehicle subframe mounting structure according to a second embodiment of the present invention.
6 is a plan view showing a vehicle subframe mounting structure according to a second embodiment of the present invention.
7 is a plan view showing a structure in which a vehicle subframe mounting structure according to a second embodiment of the present invention is applied to a side member and a cross member of a vehicle.
8 is a perspective view showing a vehicle subframe mounting structure according to a third embodiment of the present invention.
9 is a plan view showing a vehicle subframe mounting structure according to a third embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function obstructs an understanding of the embodiment of the present invention, a detailed description thereof will be omitted.

In describing the constituent elements of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

1A to 3, a vehicle subframe mounting structure 10 according to an embodiment of the present invention includes a fastening member 11 for fixing a subframe (not shown) to a vehicle body side, and a fastening member 11 And at least one bulk head 12 directly connecting the side members 14 and a lower panel 13 supporting the fastening member 11 and the bulk head 12.

The vehicle subframe mounting structure 10 according to the present invention can be applied to various vehicle body structures such as a vehicle body front structure or a vehicle body rear structure. Each of the vehicle body front structure and the vehicle body rear structure may have a pair of side members 14 disposed on both sides of the floor (not shown) of the vehicle body, and a cross member 15 connecting the pair of side members 14. have. Each side member 14 may have a channel-shaped cross section with a pair of side walls 14a and a bottom wall 14b, and the cross member 15 includes a pair of cross-walls 15a and 15b. It may have a channel-shaped cross section with

According to an example, the side member 14 may be a rear side member, and the vehicle subframe mounting structure 10 according to the present invention may be applied to a vehicle body rear structure.

According to another example, the side member 14 may be a front side member, and the vehicle subframe mounting structure 10 according to the present invention may be applied to a front structure of a vehicle body.

The fastening member 11 may be mounted on each side member 14, and the fastening member 11 may fix a subframe (not shown) to the side member 14 side.

According to an embodiment, the fastening member 11 may be composed of a fixing bolt having a head portion 11a and a screw portion 11b. The threaded portion 11b of the fastening member 11 can pass through the lower panel 13 and the side member 14, and the threaded portion 11b of the fastening member 11 can protrude below the side member 14. have. The sub-frame (not shown) can be fixed to the side member 14 of the vehicle body by fastening the sub-frame (not shown) to the screw portion 11b of the fastening member 11.

According to another example, the fastening member 11 may be configured of various types for fixing a subframe (not shown), such as a projection nut, a CO2 weld nut, a press thickening nut, or the like.

The lower panel 13 may include a base 13a and a pair of flanges 13b formed on both left and right sides of the base 13a. Accordingly, the lower panel 13 may have a channel-shaped cross-sectional structure corresponding to the channel-shaped cross-section of the side member 14. The base 13a of the lower panel 13 may be coupled to the bottom wall 14b of the side member 14 through spot welding, an adhesive, etc., and each flange 13b of the lower panel 13 is a side member ( It can be bonded to each side wall (14a) of 14) through spot welding, an adhesive, or the like. In this way, the base 13a and the flange 13b of the lower panel 13 are coupled to the inner surface of the side member 14, thereby enhancing the bonding strength between the side member 14 and the lower panel 13 It is possible to improve the durability of the member 14 to the bottom wall 14b.

The flange 13b of the lower panel 13 may have a bent portion 13c formed in the middle thereof, and the flange 13b may be reinforced in its longitudinal direction by the bent portion 13c.

The lower panel 13 may have a through hole 13d, the threaded portion 11b of the fastening member 11 passes through the through hole 13d of the lower panel 13, and the bottom surface of the head 11a is It may be coupled to the lower panel 13 through projection welding, CO 2 welding, an adhesive, or the like.

Each bulkhead 12 may include a flange 18 formed at its top and/or bottom, as shown in FIG. 2. The lower side flange 18 of each bulkhead 12 may be coupled to the lower panel 13 or the side member 14 through spot welding, adhesive, or the like. For example, as shown in FIG. 2, the flange 18 is provided symmetrically at the top and bottom of each bulkhead 12, so that the bulkhead 12 can be conveniently used without distinction between the top and bottom of the bulkhead 12 when assembling.

Each bulkhead 12 may form a load transmission path through which a load is transmitted between the fastening member 11 and the side member 14 by connecting the fastening member 11 and the side member 14. . A pair of bulk heads 12 may be symmetrically coupled to the outer surface of the head portion 11a of the fastening member 11.

According to one embodiment, each bulk head 12 is coupled to the first coupling portion 21 coupled to the outer surface of the head portion 11a of the fastening member 11 and the side wall 14a of the side member 14 It may include at least one coupling portion 22 and at least one support portion 23 extending from the first coupling portion 21 to the second coupling portion 22.

The first coupling portion 21 may be configured in a semicircular shape corresponding to the outer surface shape of the head portion 11a of the fastening member 11 in a curved structure. The first coupling part 21 may have a plurality of slots 21a, and the first coupling part 21 is the head of the fastening member 11 as CO2 welding 92 is made through each slot 21a. It may be coupled to the outer surface of the part 11a.

The support part 23 may extend from the first coupling part 21 toward the side member 14. According to the embodiments of FIGS. 1A to 7, a pair of support portions 23 may extend from the first coupling portion 21, and a pair of support portions 23 may include a fastening member 11 and a side member 14. ) May extend in a diagonal direction between the sidewalls 14a. Through this, the pair of bulk heads 12 may have a plurality of support portions 23 arranged radially from the head portions 11a of the fastening member 11. In this way, since the support portions 23 of the bulk heads 12 are radially arranged from the head portion 11a of the fastening member 11, the load transferred from the subframe (not shown) to the fastening member 11 is radial It can be smoothly transferred to the side wall 14a of the side member 14 through the support portions 23 arranged in a manner.

The second coupling portion 22 is bent at the end of each support portion 23 and may be coupled to the side wall 14a of the side member 14 through spot welding or the like. Accordingly, each support portion 23 may be configured in a structure that connects the first coupling portion 21 and the second coupling portion 22, and the first coupling portion 21 is coupled to the fastening member 11 In addition, since the second coupling portion 22 is coupled to the side wall 14a of the side member 14, each support portion 23 can directly connect the fastening member 11 and the side member 14, and thus each support portion ( 23) can implement a continuous load transmission path (load path) between the fastening member 11 and the side member 14.

According to an embodiment, the second coupling portion 22 may be coupled to the flange 13b of the lower panel 13 and the sidewall 14a of the side member 14 through spot welding 91, an adhesive, or the like.

According to one embodiment, the second coupling portion 22 is a lower coupling surface 31 coupled to the flange 13b of the lower panel 13 and an upper coupling surface coupled to the side wall 14a of the side member 14 You can have (32). The upper engaging surface 32 is offset outwardly from the lower engaging surface 31 so that the upper engaging surface 32 and the lower engaging surface 31 may be formed stepped. 1B, the lower coupling surface 31 of the second coupling portion 22 is coupled to the flange 13b of the lower panel 13, and the upper coupling surface 32 is the side wall of the side member 14. As it is coupled to (14a), the outer surface of the flange 13b of the lower panel 13 can be flushed with the upper coupling surface 32 of the second coupling part 22, through which The outer surface of the flange 13b of the lower panel 13 and the lower engaging surface 31 of the second engaging portion 22 may be more firmly and stably coupled to the sidewall 14a of the side member 14.

The lower panel is bonded to the side wall (14a) of the side member (14) through spot welding, adhesive, etc., by the outer surface of the flange (13b) of the lower panel (13) and the upper engaging surface (32) of the second coupling part (22). 13 and the bulkheads 12 can be firmly fixed to the channel-shaped cross section of the side member 14. In this way, since the lower panel 13 is coupled to the bottom of the side member 14, the number of support surfaces in the Z direction can be increased, so that the potential of the durability performance can be improved.

Each bulkhead 12 secures its own rigidity sufficiently by forming a unitary one-piece structure with the first coupling part 21, the support part 23, and the second coupling part 22 through various forming processes. can do.

Referring to FIG. 4, the center of the fastening member 11 and any one transverse wall 15a of the cross member 15 may be aligned in a line along an imaginary line X1. Accordingly, the load transmitted from the subframe (not shown) may have an X-direction load component, a Y-direction load component, and a Z-direction load component. Here, the X-direction load component is referred to as a load applied along the longitudinal direction of the vehicle, the Y-direction load component is referred to as a load applied along the vehicle's width direction, and the Z-direction load component is applied along the height direction of the vehicle. It is referred to as the load that becomes. In particular, the Y-direction load may be a load component dominated by load noise. When the load is transmitted from the subframe (not shown) to the fastening member 11, it may be transmitted to the sidewall 14a of the side member 14 through a plurality of support portions 23, and the sidewall 14a of the side member 14 ) The load transmitted to the cross member 15 may be transmitted to the transverse wall 15a. That is, since the load path can be continuous in the order of the fastening member 11, the bulkhead 12, the side member 14, and the cross member 15, the X-direction support stiffness can be increased. As the Y-direction input point stiffness is greatly strengthened, not only can the load noise be significantly improved, but its durability index can be significantly improved.

[Table 1] below is a result table comparing input point stiffness, durability index, weight, weldability, etc. for the conventional example and the present invention.

Conventional example The present invention Remark Y input point stiffness 1,000kgf/mm 1,900kgf/mm +90% increase Durability Index 1.48 2.95 +90% increase weight 740g/unit 580g/unit -160g/unit Weldability Spot welding + CO2 welding Spot welding Welding quality improvement

From the above-described [Table 1], it can be seen that the Y-direction input point stiffness of the present invention is 1,900 kgf/mm, which is approximately 90% higher than the Y-direction input point stiffness of 1,000 kgf/mm of the conventional example, and the durability of the present invention The index is 2.95, which can be seen to increase by approximately 90% compared to 1.48, the durability index of the conventional example, and the weight of the present invention is 580g/unit, which decreases to about 160g/unit compared to the conventional weight of 740g/unit. I can. In other words, it can be seen that the present invention has the advantage that the Y-direction input point stiffness, durability index, and the like are significantly enhanced and the weight is reduced compared to the conventional example.

In addition, in addition to the coupling of the first coupling portion 21 and the coupling member 11 of the bulk head 12, the present invention provides a coupling portion between the bulk head 12, the lower panel 13, and the side members 14. As a whole, spot welding can be applied, and through this, there is an advantage that the welding quality can be improved as a whole compared to the conventional example in which CO 2 welding is frequently used.

According to the embodiments of FIGS. 5 to 7, each second coupling portion 22 of each bulkhead 12 may be formed flat in a vertical direction so as to conform to the sidewall 14a of the side member 14, Accordingly, each of the second coupling portions 22 may be directly welded to the side wall 14a of the side member 14 through spot welding or the like. Accordingly, the lower panel 13 may be omitted. In addition, the second coupling portion 22 of each bulkhead 12 may be aligned so that it is positioned on the same line with each of the transverse walls 15a of the cross member 15, through which a pair of fastening members 11 An imaginary line X2 connecting the center of the cross member 15 may be located between the transverse walls 15a of the crossmember 15, and the imaginary line X2 may be parallel to the transverse wall 15a of the crossmember 15. I can. Through this, it is possible to implement a structure in which the load path can be smoothly transferred between the pair of side members 14 and the cross member 15, thereby increasing the local rigidity of the subframe mounting structure 10 In addition, the overall rigidity of the body structure can be increased.

On the other hand, in the conventional subframe mounting structure, as the load transmission path forms a discontinuous closed section, CO2 welding is generally used, and as a result, the assembly operation is very cumbersome and the manufacturing cost is increased. In particular, the coupling portion by CO2 welding may have a disadvantage of causing a fracture problem due to local hardening.

On the other hand, in the present invention, since the load transmission path is not a complete closed section structure, as shown in FIG. 7, spot welding is applied to the joint portion between the bulkhead 12, the lower panel 13, and the side members 14 as a whole. As it can be, assembling property can be good. In addition, in the present invention, as the fastening member 11 and the side member 14 are continuously connected, the load can be distributed as a whole, so that the reinforcement of the input point stiffness can be effectively implemented. The torsional rigidity can be improved by strengthening the connection rigidity of (15).

8 and 9 illustrate a vehicle subframe mounting structure 60 according to another embodiment of the present invention.

8 and 9, a vehicle subframe mounting structure 60 according to an embodiment of the present invention includes a fastening member 61 for fixing a subframe (not shown) to a vehicle body structure, and a fastening member 61. ) And at least one pair of bulk heads 62 directly connecting the side members 14 and a lower panel 63 supporting the fastening member 61 and the bulk heads 62.

According to an embodiment, the fastening member 61 may be composed of a fixing bolt having a head portion 61a and a screw portion 61b. The threaded portion 61b of the fastening member 61 may pass through the lower panel 63 and the side member 14, and the threaded portion 61b of the fastening member 61 may protrude below the side member 14. have. The sub-frame (not shown) is fastened to the screw portion 61b of the fastening member 61, so that the sub-frame (not shown) may be fixed to the side member 14 of the vehicle body.

According to another embodiment, the fastening member 61 may be formed of various types for fixing a subframe (not shown), such as a projection nut, a CO2 weld nut, a press thickening nut, or the like.

The lower panel 63 may include a base 63a and a pair of flanges 63b formed on both left and right sides of the base 63a, and thus the lower panel 63 is formed on the channel-shaped cross section of the side member 14. It may have a corresponding channel-shaped cross-sectional structure. The base 63a of the lower panel 63 may be coupled to the bottom wall 14b of the side member 14 through spot welding, an adhesive, etc., and each flange 63b of the lower panel 63 is a side member ( It can be bonded to each side wall (14a) of 14) through spot welding, an adhesive, or the like. In this way, the base 63a and the flange 63b of the lower panel 63 are coupled to the inner surface of the side member 14, thereby reinforcing the bonding strength between the side member 14 and the lower panel 63 as well as the side It is possible to improve the durability of the member 14 to the floor.

As described above, each bulk head 62 directly connects the fastening member 61 and the side member 14, thereby transferring a load between the fastening member 61 and the side member 14. path) can be formed. A pair of bulk heads 62 may be symmetrically coupled to the outer surface of the head portion 11a of the fastening member 11.

Each bulk head 62 includes a first coupling portion 41 coupled to the outer surface of the head portion 61a of the fastening member 61 and one or more coupling portions coupled to the sidewall 14a of the side member 14 ( 42) and one or more support portions 23 extending from the first coupling portion 41 to the second coupling portion 42.

The first coupling portion 41 may be configured in a semicircular shape corresponding to the outer surface shape of the head portion 61a of the fastening member 61 in a curved structure. The first coupling portion 41 may be coupled to the outer surface of the head portion 61a of the fastening member 61 through CO2 welding, spot welding, or the like.

The support part 43 may extend outward from the first coupling part 41. 8 and 9, a pair of support portions 43 may extend from the first coupling portion 41, and the pair of support portions 43 are perpendicular to the axis of the side member 14 At the same time, the cross member 15 may extend parallel to the transverse wall 15a. Through this, the pair of bulkheads 62 may have a plurality of support portions 43 arranged in a line with the transverse wall 15a of the cross member 15. In addition, since the support portions 43 of each bulkhead 62 can be coupled through butt welding, the Y-direction support stiffness can be greatly increased.

Each second coupling portion 42 may be bent with respect to each support portion 43, and each second coupling portion 42 is a flange 63b of the lower panel 63 and a side wall 14a of the side member 14 ) Can be bonded through spot welding, adhesives, etc. Accordingly, each support portion 43 may be configured in a structure that connects the first coupling portion 41 and the second coupling portion 42, and the first coupling portion 41 is coupled to the fastening member 61 In addition, since the second coupling portion 42 is coupled to the side wall 14a of the side member 14, each support portion 43 can directly connect the fastening member 61 and the side member 14, and thus each support portion ( It can be seen that 43) substantially performs the function of a load path.

The second coupling portion 42 may have a lower coupling surface 51 coupled to the flange 13b of the lower panel 13 and an upper coupling surface 52 coupled to the sidewall 14a of the side member 14. have. The upper engaging surface 52 is offset outwardly from the lower engaging surface 51, so that the upper engaging surface 52 and the lower engaging surface 51 may be formed stepped. As the lower coupling surface 51 of the second coupling portion 42 is coupled to the flange 63b of the lower panel 63, the outer surface of the flange 63b of the lower panel 63 is the outer surface of the second coupling portion 42. The upper coupling surface 52 and the lower coupling surface 52 of the second coupling portion 42 and the outer surface of the flange 63b of the lower panel 63 may be flushed with It can be more firmly and stably coupled to the side wall (14a) of the side member (14).

Each of the bulkheads 62 may sufficiently secure its own rigidity as the first coupling portion 41, the support portion 43, and the second coupling portion 42 are formed in a unitary one-piece structure.

The outer surface of the flange 63b of the lower panel 63 and the upper engaging surface 52 of the second engaging portion 42 are coupled to the sidewall 14a of the side member 14 through spot welding, etc. ) And the bulkheads 62 may be firmly fixed to the channel-shaped cross section of the side member 14.

According to the embodiments of FIGS. 8 and 9, the support portions 43 of the bulk heads 62 are sub-parallel from the head portion 61a of the fastening member 61 to the transverse wall 15a of the cross member 15. The load transferred from the frame (not shown) to the fastening member 61 may be smoothly transferred to the cross member 15 through the support portions 43 and the side walls 14a of the side members 14.

Other configurations and operations are similar to or the same as those of the preceding embodiments, so detailed descriptions thereof will be omitted.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

10, 60: vehicle subframe mounting structure
11. 61: fastening member
12, 62: bulkhead
13, 63: lower panel
14: side member
15: cross member
21, 41: first coupling portion
22, 42: second coupling portion
23, 43: support
31, 51: lower coupling surface
32, 52: upper coupling surface

Claims (11)

As a vehicle subframe mounting structure disposed in a vehicle body structure having a pair of side members and a cross member connecting the pair of side members,
A fastening member mounted on each side member and configured to fix the subframe to the side member side;
At least one bulkhead configured to connect the fastening member and the side member to form a load path between the fastening member and the side member; And
Including; a lower panel supporting the fastening member and the bulk head, and having a base and a pair of flanges formed on both sides of the base,
The bulkhead includes a first coupling portion coupled to the fastening member, a second coupling portion coupled to a sidewall of the side member, and a support portion extending from the first coupling portion to the second coupling portion,
The second coupling portion has an upper coupling surface coupled to the side wall of the side member and a lower coupling surface coupled to the flange of the lower panel,
The upper coupling surface is a vehicle subframe mounting structure that is offset toward the side of the side member from the lower coupling surface.

delete The method according to claim 1,
The supporting portion is a vehicle subframe mounting structure extending in a diagonal direction between the fastening member and the side wall of the side member.
delete delete The method according to claim 1,
The base of the lower panel is coupled to the bottom wall of the side member, and each flange of the lower panel is coupled to the side wall of the side member.

delete delete The method according to claim 1,
The supporting portion is a vehicle sub-frame mounting structure extending parallel to the cross member of the cross-member. The method according to claim 1,
A vehicle subframe mounting structure in which the center of the fastening member and one of the transverse walls of the cross member are aligned in a line. The method according to claim 1,
Subframe mounting structure for a vehicle in which the second coupling portion is aligned to be positioned on the same line with each of the cross members of the cross member.

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