Vehicle front structure

Abstract

A vehicle front structure includes: a front side member; a fender member having a front end portion connected to a front end portion of the front side member; a subframe mounting bracket assembly mounted to the front end portion of the front side member and the front end portion of the fender member; and a first subframe arranged below the front side member. Specifically, the front end portion of the front side member and the front end portion of the fender member are connected side by side in a width direction of the vehicle.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2020-0095338, filed on Jul. 30, 2020, which is hereby incorporated by reference in its entirety. Technical Field

[0003] The present disclosure relates to a vehicle front structure, and more particularly, to a vehicle front structure capable of significantly reducing the severity of a collision pulse. Background Art

[0004] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0005] Typically, a vehicle includes a front subframe mounted on the vehicle body. The front subframe may support an engine, a transmission, a suspension, etc. The front subframe may be used to facilitate load transfer while providing structural rigidity to the vehicle.

[0006] The front subframe can be released from the vehicle body through a releasable joint in order to respond to a frontal impact / impact of the vehicle. Specifically, in order to reduce the severity of the collision pulse of the vehicle, it is expected that the front subframe is completely released from the vehicle body during a frontal impact of the vehicle. Since the front subframe is completely released from the vehicle body through the releasable joint during a frontal impact of the vehicle, the severity of the collision pulse of the vehicle may be reduced, and as the severity of the collision pulse of the vehicle is reduced, the restraint energy (RTE) may be reduced. RTE refers to the degree of impact load excluding the load absorbed by the vehicle body or the front subframe. As RTE increases, crashworthiness (frontal impact performance) may be reduced. Specifically, the most reliable way to reduce RTE is for the front side members and the front subframe to be deformed into a diamond shape and for the front subframe to be completely released from the vehicle body during a frontal impact.

[0007] The front mounting point of the front subframe may be connected to the front side member via a front joint, the center mounting point of the front subframe may be connected to the front side member via a center releasable joint, and the rear mounting point of the front subframe may be connected to the front side member via a rear releasable joint. When the front subframe moves downward under the vehicle during a frontal collision, the center mounting point of the front subframe may be released from the front side member via the center releasable joint, and then the rear mounting point of the front subframe may be released from the front side member via the rear releasable joint.

[0008] However, we have found that the front subframe according to the prior art often cannot be fully released in the event of a frontal collision of the vehicle because the portion of the vehicle body connected to the central releasable joint and / or the rear releasable joint is torn and the central releasable joint and / or the rear releasable joint cannot be fully released from the front side member of the vehicle body. Therefore, the front subframe and the front side member cannot be deformed into a diamond shape, resulting in an inability to effectively reduce the severity of the collision pulse of the vehicle.

[0009] The above information described in this background technology section is provided to help understanding the background technology of the present inventive concept and may include any technical concept that is not considered to be prior art known to those skilled in the art. Summary of the invention

[0010] The present disclosure provides a vehicle front structure that can significantly reduce collision pulse severity by effectively causing deformation of a front subframe and a front side member into a diamond shape in the event of a frontal impact / collision, and can safely protect a passenger compartment by sufficiently absorbing collision impact energy.

[0011] According to one aspect of the present disclosure, a vehicle front structure for a vehicle may include: a front side member; a fender member having a front end portion connected to a front end portion of the front side member; a subframe mounting bracket assembly mounted to the front end portion of the front side member and the front end portion of the fender member; and a first subframe arranged below the front side member. The front end portion of the front side member and the front end portion of the fender member are connected side by side in a width direction of the vehicle.

[0012] The subframe mounting bracket assembly may include: a first mounting bracket coupled to a front end portion of the front side member; a second mounting bracket coupled to a front end portion of the fender member; and a reinforcement member connecting the first mounting bracket and the second mounting bracket.

[0013] The first mounting bracket may include a mounting wall disposed on a bottom end of the first mounting bracket, the reinforcement member may include a support wall parallel to the mounting wall, and a front mounting hardware member may extend through and be coupled to the support wall and the mounting wall.

[0014] The front end portion of the fender member may have a plurality of flanges attached to the second mounting bracket.

[0015] The front subframe may include a front mounting bushing located in a front end portion of the front subframe, a rear mounting bushing located in a rear end portion of the front subframe, and a center mounting bushing located between the front mounting bushing and the rear mounting bushing, and the front mounting bushing may be mounted to the front mounting hardware member by a front fastener.

[0016] The center mounting bushing may be mounted to the front side member by a center fastener, and the center mounting bushing may be made of a material having a lower strength than that of the front subframe.

[0017] The front side member may have a central mounting portion protruding downwardly from a bottom surface of the front side member, a central mounting hardware member may be secured into the central mounting portion, and a central mounting bushing may be mounted to the central mounting hardware member by a central fastener.

[0018] The floor member may be connected to the front side member, the floor member may have a front end portion joined to the front side member, and the rear mounting bushing may be mounted to the front end portion of the floor member by the rear fastener.

[0019] The rear mounting hardware member may be mounted to the front end portion of the floor member through the rear reinforcement member and the bulkhead, and the rear mounting bushing may be mounted to the rear mounting hardware member through the rear fasteners.

[0020] The front end portion of the floor member may have an opening extending in the longitudinal direction of the vehicle, and the top portions of the rear mounting hardware member and the rear mounting bushing may extend through the opening of the floor member.

[0021] The rear reinforcement member may be disposed above the opening of the floor member, and the rear reinforcement member may be made of a material having a lower rigidity than the rear mounting hardware member, the floor member, and the bulkhead.

[0022] The rear reinforcement member may include a support wall to which the bottom surface of the rear mounting hardware member is fixed, the support wall may have a mounting hole through which the rear fastener passes, and the plurality of through holes may be located around the mounting hole.

[0023] The diaphragm may be disposed on the rear mounting hardware member to cover the rear mounting hardware member and the supporting wall of the rear reinforcement member, and the diaphragm may be coupled to the rear reinforcement member.

[0024] The partition plate may have a cover wall covering the supporting wall of the rear mounting hardware member and the rear reinforcement member, the cover wall may have an insertion hole into which the top portion of the rear mounting hardware member is inserted, and a plurality of through holes may be located around the insertion hole.

[0025] The front subframe may include: a central cross member; a pair of longitudinal members extending upward and obliquely from the central cross member toward the front of the vehicle; and a front cross member connecting front end portions of the pair of longitudinal members. Each longitudinal member may have a flat portion extending horizontally from the front end of the central cross member, and the flat portion may be located at a lower height than the front end portion of the longitudinal member.

[0026] Further areas of applicability will become apparent from the description provided herein.It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order that the present disclosure may be better understood, its various forms given by way of example will now be described with reference to the accompanying drawings, in which:

[0028] Figure 1 A perspective view showing a vehicle front structure according to an exemplary form of the present disclosure;

[0029] Figure 2 shows a side view of a vehicle front structure according to an exemplary form of the present disclosure;

[0030] Figure 3 A plan view showing a left side portion of a vehicle front structure according to an exemplary form of the present disclosure;

[0031] Figure 4 Shows Figure 3 A perspective view of a left side portion of a front structure of a vehicle shown in FIG.

[0032] Figure 5 Shows from Figure 4 A perspective view viewed in the direction indicated by arrow A;

[0033] Figure 6 Shows Figure 4 and Figure 5 A perspective view of the subframe mounting bracket assembly shown in ;

[0034] Figure 7 shows a perspective view of a front subframe mounted on a front structure of a vehicle according to an exemplary form of the present disclosure;

[0035] Figure 8 shows a bottom view of a vehicle front structure according to an exemplary form of the present disclosure;

[0036] Fig. 9 A side view showing a state in which a front subframe according to an exemplary form of the present disclosure is mounted to a front side member in a vehicle front structure;

[0037] Fig.10A perspective view showing a state in which a rear mounting hardware member according to an exemplary form of the present disclosure is mounted to a front end portion of a floor member through a rear reinforcement member and a bulkhead in a vehicle front structure;

[0038] Fig.11 The rear mounting hardware, rear reinforcement and bulkhead are shown. Fig.10 An exploded perspective view of a state in which the front end portion of the bottom plate member shown in FIG. 1 is released;

[0039] Fig.12 Shown along Fig.10 A cross-sectional view taken along line BB;

[0040] Fig.13 shows deformation of a frontal vehicle structure in a frontal collision according to an exemplary form of the present disclosure; and

[0041] Fig.14 The collision pulse is shown.

[0042] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. DETAILED DESCRIPTION

[0043] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate the same or corresponding parts and features.

[0044] Hereinafter, exemplary forms of the present disclosure will be described in detail with reference to the accompanying drawings. In order not to make the subject matter of the present disclosure unnecessarily obscure, detailed descriptions of well-known technologies associated with the present disclosure will be excluded.

[0045] Terms such as first, second, A, B, a and b can be used to describe the elements of the exemplary form of the present disclosure. These terms are only used to distinguish an element from another element, and the inherent characteristics, order or sequence of corresponding elements, etc. are not limited by these terms. Unless otherwise defined, all terms used herein (including technical terms or scientific terms) have the same meaning as the meaning commonly understood by the ordinary knowledge personnel of the field to which the present disclosure belongs. Those terms as defined in the commonly used dictionary should be interpreted as having the meaning equal to the contextual meaning in the relevant technical field, and should not be interpreted as having an ideal or too formal meaning, unless clearly defined as having such meaning in the present application.

[0046] refer to Figure 1According to an exemplary form of the present disclosure, a vehicle front structure 10 may include: a dash panel 11; a pair of front pillars 12, which are arranged on both edges of the dash panel 11; a pair of front side members 13, which extend through the bottom of the dash panel 11; a pair of fender members 14, which are respectively connected to the pair of front pillars 12; and a front subframe 20, which is arranged below the pair of front side members 13.

[0047] The dash panel 11 may separate the front cabin FC from the passenger cabin CA, and a prime mover (such as an internal combustion engine or an electric motor), a transmission, a heat exchanger, and the like may be arranged in the front cabin FC.

[0048] A pair of front pillars 12 may be mounted on both edges of the dash panel 11 by various reinforcement members, brackets, and the like.

[0049] A pair of front side members 13 may be spaced apart from each other in the width direction of the vehicle, and each front side member 13 may extend in the longitudinal direction of the vehicle. Each front side member 13 may extend through the bottom of the front panel 11. The front side member 13 may have a central mounting portion 45 protruding downward from its bottom surface and a top flange 13b protruding upward from its top surface. The central mounting hardware member 42 may be fixed to the central mounting portion 45. The front side member 13 may extend in the longitudinal direction of the vehicle, and the axis of the central mounting portion 45 may extend in the height direction of the vehicle. That is, the axis of the central mounting portion 45 may be perpendicular to the axis of the front side member 13. The central mounting portion 45 may protrude downward from the bottom surface of the front side member 13, and thus the sharp change in the bottom surface of each front side member 13 may act as a notch to cause stress concentration. That is, the central mounting portion 45 may act as a notch in the bottom surface of the front side member 13. As Fig.13 As shown, when an impact load is transmitted to each front side member 13 in the event of a frontal impact / collision of the vehicle, the front side member 13 can be deformed (bent) into an inverted V-shape by the center mounting portion 45 (see Fig.13 82 in the figure).

[0050] refer to Figure 8, the front side member 13 may have an extension portion 13c extending from the rear end portion of the front side member 13 toward the rear of the vehicle, and the extension portion 13c may be bent from the rear end portion of the front side member 13 toward the outside of the vehicle. A pair of floor members 55 may be attached to the bottom surface of the center floor 5 of the vehicle, and the floor members 55 may be connected to the corresponding front side members 13. In some forms, the front end portion 55a of the floor member 55 and the extension portion 13c of the front side member 13 may be joined by welding, using fasteners, etc. The floor member 55 may be referred to as a rear lower member because it is connected to the rear of the front side member 13 and attached to the bottom surface of the center floor 5. The rear mounting hardware member 43 may be joined to the front end portion 55a of the floor member 55 by welding, etc.

[0051] A pair of fender members 14 may be spaced apart from each other in the width direction of the vehicle, and each fender member 14 may extend from the front pillar 12 to a front end portion 13 a of the front side member 13 .

[0052] Figure 3 A plan view showing a structure in which a front end portion of a left fender member is connected to a front end portion of a left front side member. Figure 3 , the fender member 14 may extend from the corresponding front pillar 12 to the front end portion 13a of the corresponding front side member 13. The front end portion 14a of the fender member 14 may overlap with the front end portion 13a of the corresponding front side member 13, and the front end portion 14a of the fender member 14 may be connected to the front end portion 13a of the front side member 13 by the sub-frame mounting bracket assembly 30. The front end portion 14a of the fender member 14 and the front end portion 13a of the front side member 13 may be connected side by side in the width direction of the vehicle, and thus the front end portion 14a of the fender member 14 and the front end portion 13a of the front side member 13 may form a double box structure. Specifically, the front end portion 14a of the fender member 14 may be connected to the front end portion 13a of the front side member 13 by the sub-frame mounting bracket assembly 30. Therefore, the rigidity and strength of the front side member 13 and the rigidity and strength of the fender member 14 may be improved. According to an exemplary form of the present disclosure, the front end portion 14a of the fender member 14 and the front end portion 13a of the front side member 13 can be connected side by side in the width direction of the vehicle, thereby improving the rigidity and strength of the front portion of the vehicle front structure 10. Therefore, the frontal NCAP (New Car Assessment Program) pulse can be stabilized, and the initial peak value P1 of the collision pulse can be increased, such as Fig.14 shown.

[0053] refer to Figure 5, the subframe mounting bracket assembly 30 may be mounted to the front end portion 14a of the fender member 14 and the front end portion 13a of the front side member 13, and thus the subframe mounting bracket assembly 30 may connect the front end portion 14a of the fender member 14 and the front end portion 13a of the front side member 13. The subframe mounting bracket assembly 30 may be joined to the rear surface of the bumper beam mounting bracket 18 by welding, using fasteners, or the like.

[0054] refer to Figures 4 to 6 The sub-frame mounting bracket assembly 30 may include: a first mounting bracket 31, which is coupled to the front end portion 13a of the front side member 13; a second mounting bracket 32, which is coupled to the front end portion 14a of the fender member 14; and a reinforcing member 33, which connects the first mounting bracket 31 and the second mounting bracket 32.

[0055] refer to Figure 4 , the first mounting bracket 31 may extend downward from the front end portion 13a of the front side member 13. The first mounting bracket 31 may be attached to the front end portion 13a of the front side member 13 by welding, using fasteners, etc. Figure 6 The first mounting bracket 31 may include a front flange 31a attached to the bumper beam mounting bracket 18 and a rear flange 31b attached to the front end portion 13a of the front side member 13. The first mounting bracket 31 may have a mounting wall 35 disposed on a bottom end thereof, and the mounting wall 35 may be a flat wall parallel to the bottom of the front side member 13.

[0056] refer to Figure 4 and Figure 5 The second mounting bracket 32 ​​may be attached to the front end portion 14a of the fender member 14 by welding, using fasteners, etc. Figure 6 The second mounting bracket 32 ​​may include: a front flange 32a attached to the bumper beam mounting bracket 18; a top flange 32b attached to the top flange 13b of the front side member 13; and a bottom flange 32c attached to the mounting wall 35 of the first mounting bracket 31.

[0057] refer to Figure 5, the front end portion 14a of the fender member 14 may have a plurality of flanges 15, 16, and 17 attached to the second mounting bracket 32. Specifically, the front end portion 14a of the fender member 14 may have a top flange 15 extending from a top end of the front end portion 14a, a bottom flange 16 extending from a bottom end of the front end portion 14a, and a middle flange 17 extending from a middle portion of the front end portion 14a. The top flange 15 may be attached to a top surface of the second mounting bracket 32 ​​by welding W1, the bottom flange 16 may be attached to a bottom surface of the second mounting bracket 32 ​​by welding W2, and the middle flange 17 may be attached to a rear surface of the second mounting bracket 32 ​​by welding W3. The side wall of the front end portion 14a of the fender member 14 may be attached to the side wall of the front end portion 13a of the front side member 13 by welding W4.

[0058] refer to Figure 4 and Figure 6 , the reinforcing member 33 may be coupled between the first mounting bracket 31 and the second mounting bracket 32 ​​to connect the first mounting bracket 31 and the second mounting bracket 32. Figure 6 , the reinforcement member 33 may include a support wall 33a, a front flange 33b located on a front end of the support wall 33a, a first side flange 33c located on one edge of the support wall 33a, a second side flange 33d located on the other edge of the support wall 33a, and a rear flange 33e located on a rear end of the support wall 33a. The support wall 33a may be a flat wall parallel to the mounting wall 35 of the first mounting bracket 31. The front flange 33b may be attached to the bumper beam mounting bracket 18 by welding, using fasteners, etc. The first side flange 33c may be attached to the first mounting bracket 31 by welding, using fasteners, etc., and the second side flange 33d may be attached to the second mounting bracket 32 ​​by welding, using fasteners, etc. The rear flange 33e may be attached to the rear wall of the first mounting bracket 31 and the rear wall of the second mounting bracket 32 ​​by welding, using fasteners, etc.

[0059] The front mounting hardware member 41 may be coupled to the sub-frame mounting bracket assembly 30. The front mounting hardware member 41 may extend through the support wall 33a of the reinforcement member 33 and the mounting wall 35 of the first mounting bracket 31. The front mounting hardware member 41 may be coupled to the support wall 33a of the reinforcement member 33 and the mounting wall 35 of the first mounting bracket 31 by welding or the like, and may be a pipe nut having a cylindrical shape.

[0060] refer to Figure 1, the bumper beam 19 may extend in the width direction of the vehicle, and both end portions of the bumper beam 19 may be mounted to a pair of bumper beam mounting brackets 18 through a pair of crash boxes 19a, respectively. The front end of each crash box 19a may be joined to the end portion of the bumper beam 19 by welding, using fasteners, etc., and the rear end of each crash box 19a may be joined to the bumper beam mounting bracket 18 by welding, using fasteners, etc., and thus the crash box 19a may connect the corresponding bumper beam mounting bracket 18 with the corresponding end portion of the bumper beam 19. The bumper beam mounting bracket 18 may be connected to both the front end portion 14a of the fender member 14 and the front end portion 13a of the front side member 13 through the subframe mounting bracket assembly 30, and thus the support rigidity of the bumper beam mounting bracket 18, the connection rigidity of the crash box 19a, and the rigidity of the bumper beam 19 may be improved. Therefore, as Fig.14 As shown, the initial peak value P1 of the collision pulse can be increased.

[0061] The front subframe 20 may be mounted to the front side member 13, the subframe mounting bracket assembly 30, and the floor member 55. Figure 2 , a length 71 between a front portion of the front subframe 20 and a rear portion of the front subframe 20 may be determined to absorb collision impact energy of the vehicle.

[0062] refer to Figure 7 and Figure 8 , the front subframe 20 may have a front end portion facing the front of the vehicle and a rear end portion facing the rear of the vehicle. The front subframe 20 may include a pair of front mounting bushings 26 located at the front end portion thereof, a pair of rear mounting bushings 28 located at the rear end portion thereof, and a pair of center mounting bushings 27 located between the front mounting bushings 26 and the rear mounting bushings 28. The front mounting bushings 26 may be mounted to the front mounting hardware member 41 of the subframe mounting bracket assembly 30 by front fasteners 51, and the rear mounting bushings 28 may be mounted to the front end portion 55a of the floor member 55 by rear fasteners 53. The center mounting bushing 27 may be mounted to the center mounting portion 45 of the front side member 13 by a center fastener 52.

[0063] refer to Figure 7 The front subframe 20 may include: a central cross member 21; a pair of longitudinal members 22 extending from the central cross member 21 toward the front of the vehicle; and a front cross member 23 connecting front end portions of the pair of longitudinal members 22.

[0064] A pair of cantilever arms 29 may be connected to both the left and right sides of the center cross member 21. A pair of attachment arms 24 may extend from the center cross member 21 toward the front side member 13. A center mounting bushing 27 may be located on the top end of the attachment arm 24. The center mounting bushing 27 may be mounted to the center mounting hardware member 42 of the center mounting portion 45 of the front side member 13 by a center fastener 52. The center mounting bushing 27 may be made of a material having a strength lower than that of the vehicle body and the front subframe 20. For example, the center mounting bushing 27 may be made of a resin material such as plastic. Therefore, in the event of a frontal collision of the vehicle, the center mounting bushing 27 may be broken earlier than the front subframe 20, so that the attachment arm 24 of the center cross member 21 may be easily released from the center mounting portion 45 of the front side member 13.

[0065] The rear mounting bushing 28 may be located in the rear portion of the center cross member 21, and the rear mounting bushing 28 may be of one-piece construction with the rear portion of the center cross member 21. The rear mounting bushing 28 may be mounted to the rear mounting hardware member 43 of the floor member 55 by the rear fastener 53 (see Figure 8 and Fig.12 ). refer to Fig.12 , the rear mounting bushing 28 may be located within the center cross member 21, and the protrusion 28a may protrude from the top end of the rear mounting bushing 28. The outer diameter of the protrusion 28a may be greater than the outer diameter of the rear mounting bushing 28.

[0066] Each longitudinal member 22 may extend from the front end of the center cross member 21 toward the front of the vehicle. The longitudinal member 22 may extend upward and obliquely from the front end of the center cross member 21 toward the subframe mounting bracket assembly 30. The longitudinal member 22 may have a flat portion 22a extending horizontally from the front end of the center cross member 21, and the flat portion 22a may be located at a lower height than the front end portion of the longitudinal member 22. The flat portion 22a may serve as a notch that causes deformation of the longitudinal member 22. Fig.13 As shown, in the event of a frontal impact / crash of the vehicle, when the impact load is transmitted along the longitudinal member 22, the longitudinal member 22 may be deformed (bent) from the flat portion 22a into a V-shape (see Fig.13 81 in the figure).

[0067] refer to Figure 8 and Fig. 9 Each longitudinal member 22 may have a front mounting bushing 26 located in its front end portion, and the front mounting bushing 26 may be constructed in one piece with the front end portion of the front subframe 20. The front mounting bushing 26 may be coupled to the front mounting hardware member 41 of the subframe mounting bracket assembly 30 by a front fastener 51 (see Figure 8 ).

[0068] refer to Figures 9 to 12 , the rear mounting hardware member 43 may be mounted to the front end portion 55a of the bottom plate member 55 through the rear reinforcement member 61 and the bulkhead 62. The front end portion 55a of the bottom plate member 55 may have an opening 57, and the opening 57 may have a groove shape extending in the longitudinal direction of the vehicle. The rear mounting hardware member 43 and the protrusion 28a of the rear mounting bushing 28 may extend through the opening 57. Specifically, since the length of the opening 57 is greater than the diameter of the rear mounting hardware member 43 and the diameter of the protrusion 28a, the rear mounting hardware member 43 and the protrusion 28a of the rear mounting bushing 28 may be allowed to move toward the rear of the vehicle along the opening 57 during a frontal collision of the vehicle, and thus the rear mounting hardware member 43 and the rear mounting bushing 28 may be easily released from the front end portion 55a of the bottom plate member 55. Since the rear mounting hardware member 43 and the rear mounting bushing 28 move toward the rear of the vehicle along the opening 57 of the floor member 55 in the event of a frontal collision of the vehicle, the late peak value P2 of the collision pulse can be reduced and the pulse P3 in the third collision section S3 can be delayed, as shown in FIG. Fig.14 shown.

[0069] The rear reinforcement member 61 may be disposed above the opening 57 of the front end portion 55a of the bottom plate member 55, and the edge of the rear reinforcement member 61 may be joined to the periphery of the opening 57 of the bottom plate member 55 by welding, using fasteners, etc. The rear reinforcement member 61 may have a support wall 63 to which the bottom surface of the rear mounting hardware member 43 is fixed. The support wall 63 may be a horizontal flat wall, and the support wall 63 may be supported by a side wall 63a.

[0070] A portion of the rear reinforcement member 61 may extend through the opening 57 of the bottom plate member 55. Fig.12 , the front portion of the support wall 63 of the rear reinforcement member 61 may extend through the opening 57 of the bottom plate member 55, and thus the impact energy absorption distance 72 from the rear mounting hardware member 43 and the protrusion 28a to the rear portion of the support wall 63 may be ensured. The support wall 63 may have a mounting hole 65 through which the rear fastener 53 passes. The rear mounting hardware member 43 may be a pipe nut to which the rear fastener 53 is fastened. The rear mounting hardware member 43 may be aligned with the mounting hole 65 of the support wall 63, and the bottom surface of the rear mounting hardware member 43 may be fixed to the support wall 63 of the rear reinforcement member 61 by welding or the like. A plurality of through holes 67 may be located around the mounting hole 65, and thus in the event of a frontal collision of the vehicle, the rear mounting hardware member 43 may easily break the support wall 63 of the rear reinforcement member 61 through the plurality of through holes 67. Therefore, the rear mounting hardware member 43 and the rear mounting bushing 28 may be easily released from the bottom plate member 55.

[0071] According to an exemplary form, the rear reinforcement member 61 may be made of a material having lower rigidity and strength than the rear mounting hardware member 43, the bottom plate member 55, and the bulkhead 62. For example, the material of the rear reinforcement member 61 may be low carbon steel. In the event of a frontal collision of the vehicle, when an impact load is applied to the rear mounting hardware member 43, the rear reinforcement member 61 may be easily torn. Therefore, the rear mounting hardware member 43 and the rear mounting bushing 28 may be easily released from the front end portion 55a of the bottom plate member 55.

[0072] The partition 62 may be arranged on the rear mounting hardware member 43 to cover the rear mounting hardware member 43 and the support wall 63 of the rear reinforcement member 61. The partition 62 may be joined to the rear reinforcement member 61 by welding, using fasteners, etc. The partition 62 may have a cover wall 68 covering the rear mounting hardware member 43 and the support wall 63 of the rear reinforcement member 61, and the cover wall 68 may be horizontally flat. The cover wall 68 may be supported by a side wall 68a. The cover wall 68 may be parallel to the support wall 63 of the rear reinforcement member 61. The cover wall 68 may have an insertion hole 64 into which the top portion of the rear mounting hardware member 43 is inserted, and the top portion of the rear mounting hardware member 43 may be fixed to the insertion hole 64 by welding, etc. In addition, a reinforcing rib 69 may be provided around the insertion hole 64, and the reinforcing rib 69 may rise upward from the cover wall 68.

[0073] A plurality of through holes 66a and 66b may be located around the insertion hole 64. The plurality of through holes 66a and 66b may include a slot-shaped through hole 66a and a circular through hole 66b. In the event of a frontal collision of the vehicle, the rear mounting hardware member 43 may easily break the cover wall 68 of the bulkhead 62 through the plurality of through holes 66a and 66b, and thus the rear mounting hardware member 43 and the rear mounting bushing 28 may be easily released from the bottom plate member 55.

[0074] Theoretically, to reduce the severity of the crash pulse during a frontal collision, the amount of dynamic deformation can be increased by increasing the initial peak value P1 of the crash pulse and reducing the late peak value P2 of the crash pulse, and thus the pulse P3 in the third crash section can be delayed. Fig.14 A crash pulse is shown, where the crash pulse is the acceleration curve measured in a vehicle during a crash test. Fig.14, compared with the initial peak value V1 relative to the vehicle front structure according to the related art, the initial peak value P1 in the primary collision section S1 of the collision pulse relative to the vehicle front structure according to the exemplary form of the present disclosure can be increased, and compared with the late peak value V2 relative to the vehicle front structure according to the related art, the late peak value P2 in the secondary collision section S2 of the collision pulse relative to the vehicle front structure according to the exemplary form of the present disclosure can be reduced. Compared with the pulse V3 relative to the vehicle front structure according to the related art, the pulse P3 in the tertiary collision section S3 relative to the vehicle front structure according to the exemplary form of the present disclosure can be delayed.

[0075] As described above, in the event of a frontal impact / collision, the vehicle front structure according to the exemplary form of the present disclosure can effectively cause the front subframe and the front side member to deform into a diamond shape, thereby significantly improving the severity of the collision pulse, and can fully absorb the collision impact energy, thereby safely protecting the passenger compartment.

[0076] According to an exemplary form of the present disclosure, during a frontal impact / crash of the vehicle, the longitudinal member 22 is deformed (bent) from the flat portion 22a into a V-shape (refer to Fig.13 81), while the front side member 13 is deformed (bent) by the central mounting portion 45 into an inverted V-shape (reference Fig.13 82), and thus the front subframe 20 and the front side member 13 can be integrally deformed into a rhombus shape, resulting in a reduction in the severity of the collision pulse.

[0077] According to an exemplary form of the present disclosure, the front end portion 14a of the fender member 14 and the front end portion 13a of the front side member 13 can be connected side by side in the width direction of the vehicle, thereby improving the rigidity and strength of the front portion of the vehicle front structure 10. Each bumper beam mounting bracket 18 can be connected to both the front end portion 14a of the fender member 14 and the front end portion 13a of the front side member 13 through the subframe mounting bracket assembly 30, and thus the support rigidity of the bumper beam mounting bracket 18, the connection rigidity of the crash box 19a, and the rigidity of the bumper beam 19 can be improved. Therefore, as Fig.14 As shown, the initial peak value P1 of the collision pulse can be increased.

[0078] According to an exemplary form of the present disclosure, in the event of a frontal impact / crash of the vehicle, after the center mounting bushing 27 is released from the center mounting hardware member 42 and the rear mounting bushing 28 is released from the rear mounting hardware member 43, the rear mounting bushing 28 and the rear mounting hardware member 43 of the front subframe 20 may move toward the rear of the vehicle along the opening 57 of the floor member 55, and thus the dynamic deformation may be increased. Fig.14As shown, the late peak value P2 of the collision pulse can be reduced, and the pulse P3 in the third collision section S3 can be delayed.

[0079] Hereinabove, although the present disclosure has been described with reference to exemplary forms and drawings, the present disclosure is not limited thereto, and various modifications and changes may be made by those skilled in the art to which the present disclosure belongs without departing from the spirit and scope of the present disclosure.

Claims

1. A vehicle front structure for a vehicle, comprising: front side member; a fender member having a front end portion connected to a front end portion of the front side member; a subframe mounting bracket assembly mounted to the front end portion of the front side member and the front end portion of the fender member; as well as a front subframe, the front subframe being arranged below the front side member, wherein the front end portion of the front side member and the front end portion of the fender member are connected side by side in the width direction of the vehicle; Wherein, the sub-frame mounting bracket assembly includes: a first mounting bracket, the first mounting bracket is coupled to the front end portion of the front side member; a second mounting bracket, the second mounting bracket is coupled to the front end portion of the fender member; and a reinforcing member, the reinforcing member connecting the first mounting bracket and the second mounting bracket; wherein the first mounting bracket comprises a mounting wall arranged on a bottom end of the first mounting bracket, wherein the reinforcement member includes a support wall parallel to the mounting wall, and wherein a front mounting hardware member extends through and is joined to the support wall and the mounting wall.

2. The vehicle front structure according to claim 1, wherein: The front end portion of the fender member has a plurality of flanges attached to the second mounting bracket.

3. The vehicle front structure according to claim 1, wherein: The front subframe comprises: a front mounting bushing located in a front end portion of the front subframe; a rear mounting bushing located in a rear end portion of the front subframe; and a center mounting bushing located between the front mounting bushing and the rear mounting bushing, and Wherein, the front mounting bushing is mounted to the front mounting hardware component by a front fastener.

4. The vehicle front structure according to claim 3, wherein: The central mounting bushing is mounted to the front side member by a central fastener, and The center mounting bushing is made of a material having a strength lower than that of the front subframe.

5. The vehicle front structure according to claim 4, wherein: The front side member has a central mounting portion protruding downward from a bottom surface of the front side member, A central mounting hardware member is secured to the central mounting portion, and The center mounting bushing is mounted to the center mounting hardware member by the center fastener.

6. The vehicle front structure according to claim 5, wherein: A floor member is connected to the front side member, The floor member has a front end portion joined to the front side member, and the rear mounting bushing is mounted to the front end portion of the floor member by a rear fastener.

7. The vehicle front structure according to claim 6, wherein: a rear mounting hardware member mounted to the front end portion of the floor member through a rear reinforcement member and a bulkhead, and The rear mounting bushing is mounted to the rear mounting hardware member by the rear fastener.

8. The vehicle front structure according to claim 7, wherein: The front end portion of the floor member has an opening extending in the longitudinal direction of the vehicle, and The rear mounting hardware member and top portions of the rear mounting bushing extend through the opening of the base plate member.

9. The vehicle front structure according to claim 8, wherein: The rear reinforcement member is arranged above the opening of the floor member, and the rear reinforcement member is made of a material having a lower rigidity than the rear mounting hardware member, the floor member, and the bulkhead.

10. The vehicle front structure according to claim 9, wherein: The rear reinforcement member includes a support wall to which a bottom surface of the rear mounting hardware member is fixed, The supporting wall has a mounting hole through which the rear fastener passes, and a plurality of through holes are located around the mounting hole.

11. The vehicle front structure according to claim 10, wherein: The partition plate is arranged on the rear mounting hardware member to cover the rear mounting hardware member and the supporting wall of the rear reinforcement member, and The bulkhead is joined to the rear reinforcement member.

12. The vehicle front structure according to claim 10, wherein: The bulkhead has a cover wall covering the rear mounting hardware member and the support wall of the rear reinforcement member, The cover wall has an insertion hole into which the top portion of the rear mounting hardware member is inserted, and A plurality of through holes are located around the insertion hole.

13. The vehicle front structure according to claim 1, wherein: The front subframe comprises: center cross member; a pair of longitudinal members extending upwardly and obliquely from the central cross member toward the front of the vehicle, and a front cross member connecting front end portions of the pair of longitudinal members, in: Each of the pair of longitudinal members has a flat portion extending horizontally from a front end of the central cross member, and The flat portion is located at a lower height than a top end portion of the longitudinal member.

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