Patent Publication Number: US-9834256-B2

Title: Vehicle lower portion structure

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2015-152461 filed on Jul. 31, 2015, which is incorporated by reference herein. 
     BACKGROUND 
     Technical Field 
     The present invention relates to a vehicle lower portion structure. 
     Related Art 
     Japanese Patent Application Laid-open (JP-A) No. 2013-256162 discloses a vehicle lower portion structure for a vehicle front portion equipped with a pair of right and left front side members, which extend in the vehicle front and rear direction on both vehicle width direction sides of the vehicle front portion, and a suspension member, which is supported via suspension supports on the pair of right and left front side members. Furthermore, the suspension member is formed in a rectangular frame shape by virtue of having a pair of right and left side members (side rails) that are placed apart from each other in the vehicle width direction, a cross member (a front-side cross member) that interconnects in the vehicle width direction the vehicle front-side end portions of the pair of right and left side members, and a cross member that interconnects in the vehicle width direction the vehicle rear-side end portions of the pair of right and left side members. 
     In a configuration having the front-side cross member that interconnects in the vehicle width direction the vehicle front-side end portions of the pair of right and left side members, twisting and deflection of the vehicle front-side end portions of the pair of right and left side members are controlled. Because of this, vibration transmitted from the suspension member to the front side members is reduced. 
     However, although the configuration having the front-side cross member is effective from the standpoint of reducing vibration transmitted from the suspension member to the front side members, there is room for improvement from the standpoint of controlling an increase in the weight of the lower portion of the vehicle. 
     SUMMARY OF THE INVENTION 
     In consideration of the circumstances described above, it is an object of the present disclosure to obtain a vehicle lower portion structure that can reduce vibration transmitted from the suspension member to the front side members while controlling an increase in the weight of the lower portion of the vehicle. 
     A vehicle lower portion structure of a first aspect includes: a pair of right and left front side members that are placed apart from each other in the vehicle width direction in a vehicle front portion and are disposed extending in the vehicle front and rear direction; a heat exchanger support lower member that extends in the vehicle width direction and configures a region on the vehicle lower side of a heat exchanger support that supports a heat exchanger disposed in the vehicle front portion; a suspension member having a pair of right and left side rails that are placed on the vehicle lower side of the pair of right and left front side members, are supported on the pair of right and left front side members, are placed apart from each other in the vehicle width direction, and extend in the vehicle front and rear direction, with the suspension member not having a section that interconnects in the vehicle width direction the vehicle front-side end portion of the side rail placed on one vehicle width direction side and the vehicle front-side end portion of the side rail placed on the other vehicle width direction side, and a pair of right and left coupling portions that respectively interconnect the vehicle front-side end portion of the side rail placed on the one vehicle width direction side and the heat exchanger support lower member and interconnect the vehicle front-side end portion of the side rail placed on the other vehicle width direction side and the heat exchanger support lower member. 
     According to the vehicle lower portion structure of the first aspect, the suspension member where the vehicle front-side end portions of the pair of right and left side rails are not interconnected in the vehicle width direction is supported on the front side members. The configuration of the suspension member is such that the vehicle front-side end portions of the pair of right and left side rails twist or easily deflect. For that reason, it is difficult to reduce vibration transmitted from the suspension member to the front side members. However, in the present invention, the vehicle front-side end portions of the pair of right and left side rails configuring part of the suspension member and the heat exchanger support lower member configuring part of the heat exchanger support that supports the heat exchanger are interconnected via the pair of right and left coupling portions. That is, the vehicle front-side end portions of the pair of right and left side rails are interconnected in the vehicle width direction via the pair of right and left coupling portions and the heat exchanger support lower member. Because of this, twisting and deflection of the vehicle front-side end portions of the pair of right and left side rails configuring part of the suspension member can be controlled while controlling an increase in the weight of the suspension member. As a result, in the present invention, vibration transmitted from the suspension member to the front side members can be reduced while controlling an increase in the weight of the lower portion of the vehicle. 
     A vehicle lower portion structure of a second aspect is the vehicle lower portion structure of the first aspect, wherein the vehicle front-side end portion of the side rail placed on the one vehicle width direction side is secured to the front side member placed on the one vehicle width direction side, the vehicle front-side end portion of the side rail placed on the other vehicle width direction side is secured to the front side member placed on the other vehicle width direction side, and regions of the pair of right and left coupling portions between regions secured to the heat exchanger support lower member and regions secured to the side rails are sloped outward in the vehicle width direction heading toward the vehicle rear side as seen in a vehicle plan view. 
     According to the vehicle lower portion structure of the second aspect, the regions (hereinafter these regions will be called “middle portions”) of the pair of right and left coupling portions between the regions secured to the heat exchanger support lower member and the regions secured to the side rails are sloped in the way described above. Because of this, twisting, whose axial direction coincides with the vehicle front and rear direction, of the vehicle front-side end portions of the pair of right and left side rails configuring part of the suspension member can be effectively controlled compared to a configuration where the middle portions of the coupling portions extend in the vehicle front and rear direction. Furthermore, in a configuration where the middle portions of the pair of right and left coupling portions are sloped in the way described above, when an external force heading toward the vehicle rear side has been input to the heat exchanger support lower member, a rotational force about the regions of the coupling portions secured to the side rails can be produced in the coupling portions. Because of this, when an external force heading toward the vehicle rear side has been input to the heat exchanger support lower member, it can be made easier for the coupling portions to tilt (turn) about the regions secured to the side rails or for the middle portions of the coupling portions to undergo bending deformation. As a result, in the present invention, at the time of a frontal crash, for example, the region on the vehicle lower side of the heat exchanger can be moved backward toward the vehicle rear side. 
     A vehicle lower portion structure of a third aspect is the vehicle lower portion structure of the second aspect, wherein heat exchanger anchoring portions to which part of the heat exchanger is anchored are disposed in the heat exchanger support lower member, and the pair of right and left coupling portions are secured to regions of the heat exchanger support lower member that are adjacent to the heat exchanger anchoring portions. 
     According to the vehicle lower portion structure of the third aspect, when an external force heading toward the vehicle rear side is input to the heat exchanger, the external force is transmitted from the heat exchanger to the heat exchanger anchoring portions disposed in the heat exchanger support lower member. Here, in the present disclosure, the pair of right and left coupling portions are secured to regions of the heat exchanger support lower member that are adjacent to the heat exchanger anchoring portions. Because of this, when the external force has been transmitted to the heat exchanger anchoring portions of the heat exchanger support lower member, it can be made easier for the coupling portions to quickly tilt (turn) about the regions secured to the side rails or for the middle portions of the coupling portions to quickly undergo bending deformation. As a result in the present invention, at the time of a frontal crash, for example, the region on the vehicle lower side of the heat exchanger can be quickly moved backward toward the vehicle rear side. 
     A vehicle lower portion structure of a fourth aspect is the vehicle lower portion structure of the second aspect or the third aspect, wherein weak portions are formed in the regions of the pair of right and left coupling portions between the regions secured to the heat exchanger support lower member and the regions secured to the side rails. 
     According to the vehicle lower portion structure of the fourth aspect, the weak portions are formed in the middle portions of the pair of right and left coupling portions. For that reason, when an external force heading toward the vehicle rear side is input to the heat exchanger support lower member, it is easier for the coupling portions to become deformed starting at the weak portions or the peripheral edge portions thereof. Because of this, in the present disclosure, at the time of a frontal crash, for example, the region on the vehicle lower side of the heat exchanger can be quickly moved backward toward the vehicle rear side. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view, seen obliquely from a vehicle lower side, of a front portion of a vehicle to which a vehicle lower portion structure of an embodiment has been applied; 
         FIG. 2  is a bottom view, seen from the vehicle lower side, of the front portion of the vehicle to which the vehicle lower portion structure of the embodiment has been applied; 
         FIG. 3  is an enlarged perspective view, seen from an engine compartment side, of the area around a front end portion of a right-side side rail configuring part of a suspension member; 
         FIG. 4  is an enlarged perspective view showing a brace that interconnects side rails of the suspension member and a radiator support lower member; 
         FIG. 5  is a cross-sectional view showing a cross section of the brace cut along line  5 - 5  shown in  FIG. 4 ; 
         FIG. 6  is an enlarged perspective view showing a state in which a brace pertaining to an example modification is secured to a side rail of the suspension member and the radiator support lower member; and 
         FIG. 7  is a perspective view, corresponding to  FIG. 1  and seen obliquely from the vehicle lower side, of a front portion of a vehicle pertaining to a contrasting example. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A vehicle lower portion structure pertaining to an embodiment of the present disclosure will be described using  FIG. 1  to  FIG. 5 . It should be noted that arrow FR, arrow UP, and arrow OUT appropriately shown in the drawings indicate a forward direction (traveling direction) of the vehicle, an upward direction, and an outward direction in the vehicle width direction. Furthermore, below, when description is given simply using the directions of front and rear, right and left, and up and down, unless otherwise specified these will be understood to mean front and rear in the vehicle front and rear direction, right and left in the vehicle right and left direction (vehicle width direction), and up and down in the vehicle up and down direction. 
       FIG. 1  to  FIG. 3  show a front portion  10  of a vehicle body to which the vehicle lower portion structure of the present embodiment has been applied. It should be noted that the state of the front portion  10  of the vehicle body shown in  FIG. 1  to  FIG. 3  is a state before a fender panel and a bumper cover are attached thereto. As shown in  FIG. 1 , the front portion  10  of the vehicle body is equipped with a pair of right and left front side members  12 , which are placed apart from each other in the vehicle width direction and are disposed extending in the vehicle front and rear direction, and a bumper reinforcement  14 , which is attached to the front end portions of the pair of right and left front side members  12 . Furthermore, the front portion  10  of the vehicle body is equipped with a radiator support  16  serving as a heat exchanger support that is placed on the rear side of the bumper reinforcement  14  and supports a heat exchanger such as a radiator. Moreover, the front portion  10  of the vehicle body is equipped with a suspension member  18 , to which suspension arms and a steering gearbox are attached. Furthermore, the front portion  10  of the vehicle body is equipped with a pair of right and left braces  20  serving as coupling portions that interconnect the radiator support  16  and the suspension member  18 . 
     The front side member  12  placed on one vehicle width direction side (the right side) and the front side member  12  placed on the other vehicle width direction side (the left side) are symmetrically formed in the vehicle width direction. The pair of right and left front side members  12  are each formed in a rectangular cross section as seen in a vehicle front view. Furthermore, each of the front side members  12  is, for example, formed as a result of an inner panel placed on the vehicle width direction inside and extending along the front and rear direction and an outer panel placed on the vehicle width direction outside with respect to the inner panel and extending along the front and rear direction being joined to each other. A power unit is secured via a power unit mount to the front side members  12  described above. Furthermore, suspension towers  22  (see  FIG. 2 ), to which upper end portions of coilovers are secured, are secured to the right-side front side member  12  and the left-side front side member  12 . 
     The bumper reinforcement  14  is formed in a substantially rectangular cross section as seen in a vehicle side view and extends in such a way that its longitudinal direction coincides with the vehicle width direction inside the bumper cover. Furthermore, the bumper reinforcement  14  is attached to the front end portions of the front side members  12  via crash boxes. Because of this, the front end portion of the right-side front side member  12  and the front end portion of the left-side front side member  12  are interconnected in the vehicle width direction via the bumper reinforcement  14 . 
     The radiator support  16  is formed in a substantially rectangular frame shape as seen in a vehicle front view. The radiator support  16  is equipped with a pair of right and left radiator support side members  24  serving as heat exchanger support side members that are placed apart from each other in the vehicle width direction and extend in the up and down direction. Furthermore, the radiator support  16  is equipped with a radiator support upper member  26  (see  FIG. 3 ), which serves as a heat exchanger support upper member that interconnects in the vehicle width direction the upper end portions of the pair of right and left radiator support side members  24 , and a radiator support lower member  28 , which serves as a heat exchanger support lower member that interconnects in the vehicle width direction the lower end portions of the pair of right and left radiator support side members  24 . The pair of right and left radiator support side members  24  are placed on the vehicle width direction inside of the pair of right and left front side members  12  and are secured to the front end portions of the pair of right and left front side members  12 . Furthermore, as shown in  FIG. 3 , both vehicle width direction end portions of the radiator support upper member  26  are secured via bolts and nuts, for example, to the upper end portions of the pair of right and left radiator support side members  24 . Moreover, the radiator support lower member  28  is formed as a result of a lower panel  30  (see  FIG. 2 ) extending along the vehicle width direction and an upper panel  32  placed on the upper side of the lower panel  30  and extending along the vehicle width direction being joined to each other. Furthermore, radiator anchoring holes  34  serving as heat exchanger anchoring portions are formed in a region on the right-side radiator support side member  24  side and a region on the left-side radiator support side member  24  side of the upper panel  32  configuring part of the radiator support lower member  28 . Additionally, anchoring portions disposed on the radiator are anchored in the radiator anchoring holes  34 , so that the lower end portion of the radiator is supported on the radiator support lower member  28 . It should be noted that bushes formed using a viscoelastic material such as rubber are interposed between the anchoring portions of the radiator and the radiator anchoring holes  34 . 
     As shown in  FIG. 1 , the suspension member  18  is placed on the lower side of the front side members  12  and is supported on the front side members  12 . As shown in  FIG. 2 , the suspension member  18  is formed in a substantially H-shape a seen in a vehicle bottom view. Specifically, the suspension member  18  is equipped with a pair of right and left side rails  36 , which are placed apart from each other in the vehicle width direction and extend in the vehicle front and rear direction, and a rear-side cross member  38 , which interconnects in the vehicle width direction the vehicle rear-side regions of the pair of right and left side rails  36 . The right-side side rail  36  and the left-side side rail  36  are symmetrically formed in the vehicle width direction. The side rails  36  are equipped with rear-side extension portions  36 A that are interconnected in the vehicle width direction by the rear-side cross member  38 , front-side extension portions  36 B that are placed on the front side of the rear-side extension portions  36 A and are placed overlapping in the up and down direction the right-side front side member  12  or the left-side front side member  12 , and middle extension portions  36 C that interconnect the rear-side extension portions  36 A and the front-side extension portions  36 B. Furthermore, the regions on the rear side of the suspension member  18 —i.e., the rear-side extension portions  36 A of the side rails  36 —are secured via bolts, for example, to regions on the rear side of the front side members  12 . Moreover, the front end portions of the suspension member  18 —i.e., the front end portions of the front-side extension portions  36 B of the side rails  36 —are secured via suspension supports  40  to the front-side end portions of the front side members  12 . 
     The pair of right and left braces  20  are formed by stamping steel plates, for example. It should be noted that the right-side brace  20  and the left-side brace  20  are symmetrically formed in the vehicle width direction, so below, the right-side brace  20  will be described and description of the left-side brace  20  will be omitted. 
     As shown in  FIG. 3 , the right-side brace  20  interconnects the front end portion of the right-side side rail  36  (the front-side extension portion  36 B) of the suspension member  18  and the right-side end portion of the radiator support lower member  28 . As shown in  FIG. 4  and  FIG. 5 , the right-side brace  20  is equipped with a general portion  42 , which is shaped like a rectangular plate, extends in such a way that its thickness direction coincides with the vehicle up and down direction, and is sloped outward (rightward) in the vehicle width direction heading rearward as seen in a vehicle plan view, and a flange portion  44 , which is formed as a result of the vehicle width direction inside end portion of the general portion  42  being bent downward. 
     As shown in  FIG. 4 , an end portion on one side (the front end portion) of the general portion  42  serves as a first securing portion  46  that is secured to the right-side end portion of the radiator support lower member  28 . As shown in  FIG. 3 , the first securing portion  46  is joined by spot welding to the surface on the upper side of the radiator support lower member  28  in a state in which the first securing portion  46  has been placed on the peripheral edge portion of the radiator anchoring hole  34  and on the rear side of the radiator anchoring hole  34 . It should be noted that, in the present embodiment, the first securing portion  46  is spot welded in two places apart from each other in the vehicle width direction. Furthermore, in a state in which the first securing portion  46  has been joined to the surface on the upper side of the radiator support lower member  28 , a front end portion  44 A of the flange  44  is in contact with the radiator support lower member  28 . 
     As shown in  FIG. 3  and  FIG. 4 , the end portion on the other side (the rear end portion) of the general portion  42  serves as a second securing portion  48  that is secured to the front end portion of the side rail  36  (the front-side extension portion  36 B) of the suspension member  18 . Furthermore, a bolt insertion hole  50 , through which a bolt is inserted, is formed in the second securing portion  48 . Additionally, the second securing portion  48  is secured to the front end portion of the side rail  36  as a result of a bolt inserted through the bolt insertion hole  50  being screwed into a weld nut secured to the front end portion of the side rail  36  in a state in which the second securing portion  48  has been placed along the surface on the lower side of the front end portion of the side rail  36  of the suspension member  18 . 
     Furthermore, two cored holes  52  serving as weak portions are formed in a region  42 A of the general portion  42  between the first securing portion  46  and the second securing portion  48 . Furthermore, the two cored holes  42 A are arranged adjacent to each other in the longitudinal direction of the general portion  42 . 
     Action and Effects of the Present Embodiment 
     Next, the action and effects of the present embodiment will be described. 
     As shown in  FIG. 1  to  FIG. 3 , in the front portion  10  of the vehicle body to which the vehicle lower portion structure of the present embodiment has been applied, the suspension member  18  that is not equipped with a section interconnecting in the vehicle width direction the front end portions of the pair of right and left side rails  36  is supported on the front side members  12 . The configuration of the suspension member  18  is such that the front end portions of the pair of right and left side rails  36  twist or easily deflect. For that reason, it is difficult to reduce vibration transmitted from the suspension member  18  to the front side members  12 . 
     However, in the present embodiment, the front end portions of the pair of right and left side rails  36  configuring part of the suspension member  18  and the radiator support lower member  28  configuring part of the radiator support  16  that supports the radiator are interconnected via the pair of right and left braces  20 . That is, the front end portions of the pair of right and left side rails  36  are interconnected in the vehicle width direction via the pair of right and left braces  20  and the radiator support lower member  28 . Because of this, twisting and deflection of the front end portions of the pair of right and left side rails  36  configuring part of the suspension member  18  can be controlled while controlling an increase in the weight of the suspension member  18 . As a result, in the present embodiment, vibration transmitted from the suspension member  18  to the front side members  12  can be reduced while controlling an increase in the weight of the lower portion of the vehicle. 
     In contrast, as shown in  FIG. 7 , in a front portion  54  of a vehicle body to which a vehicle lower portion structure pertaining to a contrasting example has been applied, a suspension member  58  where the front end portions of the pair of right and left side rails  36  are interconnected in the vehicle width direction via a front-side cross member  56  is supported on the front side members  12 . In the configuration of the suspension member  58 , it is difficult for twisting and deflection to occur in the front end portions of the pair of right and left side rails  36 , but the weight of the suspension member  58  itself increases. That is, in the front portion  54  of the vehicle body to which the vehicle lower portion structure pertaining to the contrasting example has been applied, vibration transmitted from the suspension member  58  to the front side members  12  can be reduced, but it is difficult to control an increase in the weight of the lower portion of the vehicle. 
     Furthermore, as shown in  FIG. 1  to  FIG. 3 , in the present embodiment, the regions  42 A (hereinafter these regions will be called “middle portions of the braces  20 ”) of the general portions  42  of the pair of right and left braces  20  between the first securing portions  46  and the second securing portions  48  are sloped outward in the vehicle width direction heading rearward as seen in a plan view. Because of this, twisting, whose axial direction coincides with the vehicle front and rear direction, of the front end portions of the pair of right and left side rails  36  configuring part of the suspension member  18  can be effectively controlled compared to a configuration where the middle portions of the braces  20  extend in the vehicle front and rear direction. Furthermore, in a configuration where the middle portions of the braces  20  are sloped in the way described above, when an external force heading toward the vehicle rear side has been input to the radiator support lower member  28 , a rotational force about the regions (the second securing portions  48 ) of the braces  20  secured to the side rails  36  can be produced in the braces  20 . Because of this, when an external force heading toward the vehicle rear side has been input to the radiator support lower member  28 , it can be made easier for the braces  20  to tilt (turn) about the second securing portions  48  or for the middle portions of the braces  20  to undergo bending deformation. As a result, in the present embodiment, at the time of a frontal crash, for example, the region on the vehicle lower side of the radiator can be moved backward toward the vehicle rear side. 
     Moreover, in the present embodiment, when an external force heading toward the vehicle rear side is input to the radiator, the external force is transmitted from the radiator to the peripheral edge portions of the radiator anchoring holes  34  disposed in the radiator support lower member  28 . Here, in the present embodiment, the first securing portions  46  of the pair of right and left braces  20  are secured to the rear sides of the peripheral edge portions of the radiator anchoring holes  34 . Because of this, when the external force has been transmitted to the peripheral edge portions of the radiator anchoring holes  34  disposed in the radiator support lower member  28 , it can be made easier for the braces  20  to quickly tilt (turn) about the second securing portions  48  or for the middle portions of the braces  20  to quickly undergo bending deformation. As a result, in the present embodiment, at the time of a frontal crash, for example, the region on the vehicle lower side of the radiator can be quickly moved backward toward the vehicle rear side. 
     Furthermore, in the present embodiment, the two cored holes  52  are formed in the regions  42 A of the general portions  42  of the braces  20  between the first securing portions  46  and the second securing portions  48 . For that reason, when an external force heading toward the vehicle rear side is input to the radiator support lower member  28 , it is easier for the braces  20  to become deformed starting at the cored holes  52  or the peripheral edge portions thereof. Because of this, in the present embodiment, at the time of a frontal crash, for example, the region on the vehicle lower side of the radiator can be quickly moved backward toward the vehicle rear side. 
     It should be noted that although in the present embodiment an example has been described where the two cored holes  52  are formed in the regions  42 A of the general portions  42  of the braces  20  between the first securing portions  46  and the second securing portions  48 , the present invention is not limited to this. For example, instead of the cored holes  52 , weak portions such as bent portions or cutout portions may also be formed in the regions  42 A of the general portions  42  of the braces  20  between the first securing portions  46  and the second securing portions  48 . Furthermore, the braces  20  can also be given a configuration in which weak portions are not formed in them. Moreover, in the present embodiment, an example has been described where the first securing portions  46  of the pair of right and left braces  20  are secured to the peripheral edge portions of the radiator anchoring holes  34 , but the present invention is not limited to this. In this way, it suffices to appropriately set, in consideration of the trajectory of the radiator at the time of a crash, the type of and whether or not to dispose weak portions, and whether or not to secure the first securing portions  46  of the pair of right and left braces  20  to the peripheral edge portions of the radiator anchoring holes  34 . 
     Braces Pertaining to Example Modification 
     Next, braces  60  pertaining to an example modification of the above embodiment will be described using  FIG. 6 . It should be noted that sometimes the same reference signs as those in the above embodiment will be assigned to members and sections corresponding to those in the above embodiment and that description of those corresponding members and sections will be omitted. Furthermore, the right-side brace  60  and the left-side brace  60  are symmetrically formed in the vehicle width direction, so below, the left-side brace  60  will be described and description of the right-side brace  60  will be omitted. 
     In this example modification, part of the brace  60  is secured to the radiator support lower member  28  in a state in which the first securing portion  46  of the brace  60  is sandwiched and held between the radiator support lower member  28  and the radiator support side member  24 . Specifically, the lower end portion of the radiator support side member  24  serves as a joint portion  62  bent outward in the vehicle width direction, and two bolt insertion holes  64  placed apart from each other in the front and rear direction are formed in the joint portion  62 . Furthermore, a single bolt insertion hole  61  is formed in the first securing portion  46  of the brace  60 . Additionally, a bolt inserted through the front-side bolt insertion hole  64  formed in the joint portion  62  is screwed into a weld nut joined to the radiator support lower member  28  in a state in which the first securing portion  46  of the brace  60  has been placed between the radiator support lower member  28  and the joint portion  62  of the radiator support side member  24 . Moreover, a bolt inserted through the rear-side bolt insertion hole  62  formed in the joint portion  62  and the bolt insertion hole  61  formed in the first securing portion  46  of the brace  60  is screwed into a weld nut joined to the radiator support lower member  28 . Because of this, the first securing portion  46  of the brace  60  is sandwiched and held between the radiator support lower member  28  and the radiator support side member  24 , and the lower end portion of the radiator support side member  24  is secured to the radiator support lower member  28 . 
     According to the brace  60  pertaining to the example modification described above, parts of the pair of right and left braces  60  can be secured to the radiator support lower member  28  using members (bolts) that join the radiator support lower member  28  and the radiator support side members  24  to each other. 
     An embodiment of the present invention has been described above, but the present invention is not limited to what is described above and can be modified and implemented in a variety of ways other than described above without departing from the spirit thereof. 
     The vehicle lower portion structure of the present disclosure can reduce vibration transmitted from the suspension member to the front side members while controlling an increase in the weight of the lower portion of the vehicle.