JP2006290224A - Vehicle body front part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body front part structure capable of enhancing fine lap collision performance in the structure in which both ends in a longitudinal direction of a front bumper reinforcement are projected to an outer side in a vehicle width direction more than a front side member in the canti-lever supported state. <P>SOLUTION: An end 24A in the longitudinal direction of the front bumper reinforcement 24 is connected to an upper member 30, a radiator support upper 38, the front side member 12 and a radiator support lower 40 by a connection body 52 in which a first connection member 62 to a fourth connection member 82 are integrally molded. Accordingly, in the case of the fine lap collision in which a collision body collides with the end 24A in the longitudinal direction, the end 24A in the longitudinal direction is supported and collision load is transmitted to a body side to absorb an energy. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle body front structure in which a longitudinal end portion of a front bumper reinforcement is projected in a cantilevered state outside a front side member in the vehicle width direction.

  Patent Document 1 below discloses an example of a vehicle body front structure. Briefly, a pair of left and right front side frames are arranged in parallel along the vehicle front-rear direction on both sides of the front portion of the vehicle body. The front end portions of these front side frames are coupled to the vicinity of both end portions of a long front bumper reinforcement arranged with the vehicle width direction as a longitudinal direction. When viewed in a plan view, both ends in the longitudinal direction of the front bumper reinforcement are projected outward in the vehicle width direction from the front side member, and are in a cantilevered state.

According to the above configuration, in the case of a frontal collision with a collision object, the collision load input from the front bumper reinforcement to the front side member is transmitted from the front side member to the subframe and then to the rocker and the floor. . Moreover, predetermined energy absorption is made in this process.
JP 2004-114814 A

  However, in the case of the above prior art, when the colliding body collides with a portion projecting in the vehicle width direction from the front side frame in the front bumper reinforcement (micro lap collision), the overhanging portion is cantilevered, and the collision load is There is no member to receive. For this reason, when the projecting portion receives a collision load, the collision load cannot be sufficiently transmitted to the front side frame side. Therefore, the bending moment for deforming the overhanging portion from the base to the vehicle rear side is increased.

  In consideration of the above-mentioned fact, the present invention improves the micro lap collision performance in a structure in which both ends in the longitudinal direction of the front bumper reinforcement project in a cantilevered support state outside the front side member in the vehicle width direction. It is an object to obtain a vehicle body front structure that can be used.

  The vehicle body front structure according to the first aspect of the present invention includes a pair of left and right front side members disposed along the vehicle front-rear direction on both sides of the vehicle body front portion, and a front end portion of these front side members. It is arranged along the vehicle width direction so as to be passed, and is coupled to the front end portion of the front side member, and both end portions in the longitudinal direction project in a cantilevered state outside the front side member in the vehicle width direction. The front bumper reinforcement, the upper member spaced apart on the upper side of the pair of left and right front side members and extending along the vehicle front-rear direction, and spaced apart on the vehicle rear side of the front bumper reinforcement, Both end portions in the longitudinal direction are arranged substantially parallel to the upper edge portion coupled to the front end portion of the upper member and the vehicle lower side of the upper edge portion. A vehicle body front portion structure applied to a vehicle body front portion including a radiator support including a lower edge portion, wherein the upper member and a longitudinal end portion of the front bumper reinforcement are connected to each other. 1 connecting member, a second connecting member for connecting an upper edge portion of the radiator support and a longitudinal end portion of the front bumper reinforcement, a front side member and an end portion of the front bumper reinforcement in the longitudinal direction. A third connecting member to be connected, and at least one element of a fourth connecting member for connecting a lower edge portion of the radiator support and a longitudinal end portion of the front bumper reinforcement are provided.

  According to a second aspect of the present invention, the vehicle body front structure according to the present invention is characterized in that, in the first aspect of the invention, two or more elements of the first connecting member to the fourth connecting member are formed as an integrally molded product. It is said.

  According to a third aspect of the present invention, in the vehicle body front portion structure according to the second aspect of the invention, the integrally molded product includes the third connecting member, and the third connecting member includes the third connecting member. Part of a cylindrical energy absorbing member that is interposed between the front end portion of the front side member and the front bumper reinforcement and that undergoes axial compression plastic deformation from a load input of a predetermined value or more is integrally formed. It is a feature.

  According to a fourth aspect of the present invention, in the vehicle body front portion structure according to the second or third aspect of the present invention, a plate thickness difference by differential thickness coupling is set in the two or more integrally formed elements. It is characterized by that.

  A vehicle body front structure according to a fifth aspect of the present invention is the element provided in the first coupling member to the fourth coupling member according to any one of the first to fourth aspects. Is fixed to the corresponding skeleton member by using a fastener.

  According to the first aspect of the present invention, both end portions of the front bumper reinforcement in the longitudinal direction are projected in a cantilevered manner outside the front side member in the vehicle width direction.

  Here, in the present invention, the first connecting member that connects the upper member and the longitudinal end portion of the front bumper reinforcement, the first connecting member that connects the upper edge portion of the radiator support and the longitudinal end portion of the front bumper reinforcement. 2 connecting members, a third connecting member for connecting the front side member and the longitudinal end portion of the front bumper reinforcement, and a first connecting portion for connecting the lower edge portion of the radiator support and the longitudinal end portion of the front bumper reinforcement. Since it has at least one element of the four connecting members, when a collision object collides with the front end of the front bumper reinforcement in the longitudinal direction (micro lap collision), the collision input to the longitudinal end The load is applied to at least one element of the first connecting member to the fourth connecting member connected thereto. Transmitting the load to the member to be derived to the binding partner. Therefore, it is possible to suppress the amount of bending moment generated starting from the base of the longitudinal end portion of the front bumper reinforcement, and to suppress the deformation amount of the longitudinal end portion toward the vehicle rear side. .

  According to the second aspect of the present invention, since the two or more elements of the first connecting member to the fourth connecting member are configured as an integrally molded product, compared to the case where each connecting member is an independent component, The number of parts can be reduced. Accordingly, the number of parts that are damaged at the time of frontal collision in the low speed range can be reduced by the reduction in the number of parts. In other words, if the number of parts is large, the number of damaged parts at the time of a frontal collision in the low speed range increases, so the part replacement work also increases. However, parts that need to be replaced by forming several parts integrally The number can be reduced and the work load can be reduced.

  According to the third aspect of the present invention, an integrally molded product is configured including the third connecting member, and is interposed between the front end portion of the front side member and the front bumper reinforcement on the third connecting member. Since a part of the cylindrical energy absorbing member that undergoes axial compression plastic deformation by a load input of a predetermined value or more is integrally formed, it is possible to further reduce the work load of the damaged part described above.

  That is, even when a micro lap collision occurs, since the collision load is normally input from the front bumper reinforcement to the energy absorbing member, the energy absorbing member is more or less deformed by axial compression and becomes a part to be replaced. . Therefore, if the energy absorbing member is integrally formed with the third connecting member from the beginning, damaged parts can be replaced together.

  According to the fourth aspect of the present invention, since the thickness difference due to the difference thickness coupling is set for two or more elements that are integrally formed, the energy absorption performance can be controlled for each element.

  According to the fifth aspect of the present invention, the elements provided in the first to fourth connection members are fixed to the corresponding skeleton members by using fasteners, so that the micro lap collision can cause If there is a damaged connecting member, if the connecting member is an element fixed to the corresponding skeleton member using a fastener, it can be easily replaced with a new connecting member by removing the fastener. . Therefore, repairability can be improved.

  As described above, the vehicle body front portion structure according to claim 1 includes the first connecting member that connects the upper member and the longitudinal end portion of the front bumper reinforcement, the upper edge portion of the radiator support, and the front bumper reinforcement. A second connecting member that connects the longitudinal ends of the front side member, a third connecting member that connects the front side member and the longitudinal end of the front bumper reinforcement, and a lower edge of the radiator support and the front bumper reinforcement Since at least one element of the fourth connecting member for connecting the longitudinal end of the front bumper reinforcement to the longitudinal end of the front bumper reinforcement at the time of the micro lap collision is effectively provided Can be transmitted to the side, resulting in improved micro-lap collision performance It has an excellent effect that it can be.

  In the vehicle body front part structure according to the present invention as set forth in claim 2, since the two or more elements of the first connecting member to the fourth connecting member in the invention according to claim 1 are formed as an integrally molded product, each connecting member Compared to the case where is used as an independent component, it is possible to reduce the number of damaged parts at the time of a frontal collision in a low speed range, and as a result, it has an excellent effect of reducing the burden of replacing damaged parts. .

  According to a third aspect of the present invention, in the vehicle body front portion structure according to the second aspect of the invention, an integrally molded product is configured including the third connecting member, and the front end of the front side member is formed on the third connecting member. A part of the cylindrical energy absorbing member that is interposed between the front part and the front bumper reinforcement and that undergoes axial compression plastic deformation from a load input greater than a predetermined value is integrally formed, so damaged parts can be replaced together As a result, there is an excellent effect that the efficiency of parts replacement work can be improved.

  In the vehicle body front part structure according to this embodiment described in claim 4, in the invention described in claim 2 or claim 3, since the plate thickness difference due to the differential thickness connection is set for two or more elements formed integrally, the energy The absorption performance can be controlled (tuned) for each element, and as a result, a desired energy absorption characteristic can be easily obtained.

  The vehicle body front part structure according to the present invention described in claim 5 is the invention according to any one of claims 1 to 4, wherein the elements included in the first connecting member to the fourth connecting member are Since the skeleton member is detachably fixed to the corresponding skeleton member, the repairability can be improved, and as a result, the user's burden can be reduced.

  Hereinafter, an embodiment of a vehicle body front structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side.

  FIG. 2 is a three-side view of the vehicle body front portion 10 to which the present invention is applied. Further, FIG. 1 shows an enlarged perspective view of an assembled state of the main part of the vehicle body front portion 10. Further, FIG. 3 shows an exploded perspective view of the main part of the vehicle body front portion 10.

(Peripheral structure)
First, an outline of the arrangement relationship of the skeleton members of the vehicle body front portion 10 will be described. As shown in FIGS. The front side member 12 is arranged. The front side member 12 is configured in a closed cross-sectional structure by a front side member outer 14 having a hat-shaped cross section and a long flat plate-like front side member inner 16 that closes an opening portion of the front side member outer 14. . A cylindrical crash box 18 is disposed at the front end of these front side members 12 so as to be continuous in the vehicle front-rear direction. The crash box 18 is configured in a closed cross-section structure by a crash box outer 20 having a hat-shaped cross section and a crash box inner 22 having a substantially rectangular flat plate shape that closes an opening portion of the crash box outer 20. Note that the front end 22A of the crash box inner 22 is bent inward in the vehicle width direction.

  Further, a long front bumper reinforcement 24 is arranged between the front end portions of the left and right crash boxes 18 along the vehicle width direction. The front bumper reinforcement 24 is formed in a cross-sectional hat shape in which the vehicle rear side is opened. Further, both end portions 24A in the longitudinal direction of the front bumper reinforcement 24 project in a state of being cantilevered to the outside in the vehicle width direction from the front side member 12 in a plan view.

  A long upper member 30 is disposed along the vehicle front-rear direction on the upper edge side of both sides of the vehicle body front portion 10. The upper member 30 includes an upper member outer 32 having a substantially L-shaped cross section, and an upper member inner 34 having a L-shaped cross section and forming a rectangular closed cross section with the upper member outer 32. Has been. The upper member 30 is disposed substantially parallel to the vehicle width direction outer side and the vehicle upper side than the front side member 12 described above.

  Further, on the vehicle rear side of the front bumper reinforcement 24, a radiator support 36 formed in a substantially rectangular frame shape when viewed from the front is disposed at a position separated by a predetermined distance. The radiator support 36 is disposed on the vehicle upper side with respect to the front bumper reinforcement 24 and extends along the vehicle width direction. The radiator support 36 is disposed on the vehicle lower side with respect to the front bumper reinforcement 24. A long radiator support lower 40 arranged in parallel to the support upper 38, and both left and right ends of the radiator support upper 38 and the longitudinal ends of the radiator support lower 40 are connected in the vehicle vertical direction. A pair of radiator support sides 42 and a radiator support upper side 44 extending obliquely from the longitudinal end portion of the radiator support upper 38 to the vehicle rear side and the vehicle upper side and coupled to the front end portion 30 </ b> A of the upper member 30. Has been.

  The radiator support upper 38 and the radiator support upper side 44 are formed in a cross-sectional hat shape in which the lower side of the vehicle is opened, and the ends of each are overlapped. The radiator support lower 40 is formed by connecting a radiator support lower upper member 46 having a cross-sectional hat shape opened on the lower side of the vehicle and a radiator support lower member 48 having a cross-sectional hat shape opened on the upper side of the vehicle. It has a closed cross-sectional structure. Further, the radiator support side 42 is formed in a U-shaped cross-section with the vehicle width direction outer side opened, and an upper end portion 42 </ b> C is inserted into the cross section of the radiator support upper 38. Further, the lower end portion 42D of the radiator support side 42 is formed into a cross-sectional hat shape in which the vehicle lower side is opened, and the end portion in the longitudinal direction of the radiator support lower upper member 46 is fitted on the inner end portion thereof. Further, the front side wall 42A of the radiator support side 42 is higher in height (dimension along the vehicle width direction) than the rear side wall 42B, and further in the vehicle width direction outer side at the middle portion in the vertical direction of the front side wall 42A. A substantially isosceles trapezoidal mounting seat 50 that bulges toward is integrally formed.

(Main part structure)
Next, the main part structure of the vehicle body front part structure according to the present embodiment will be described.

  The end 24A in the longitudinal direction of the front bumper reinforcement 24 described above is connected to the skeleton member by a connecting body 52 integrally formed by press forming a steel plate. Hereinafter, the structure of the coupling body 52 will be described in detail.

  The connecting body 52 includes a substantially rectangular flat plate-shaped mounting seat 54 disposed in contact with the longitudinal end 24 </ b> A of the front bumper reinforcement 24. Weld nuts 56 are fixed to the four corners on the back side of the mounting seat 54. Correspondingly, bolt insertion holes 58 are formed in two left and right portions on the upper and lower flange portions of the longitudinal end portion 24A of the front bumper reinforcement 24, respectively. Then, the bolt 60 is inserted into the bolt insertion hole 58 from the front side of the front bumper reinforcement 24 and screwed into the weld nut 56, so that the mounting seat 54 is positioned at a substantially intermediate portion in the height direction of the coupling body 52. Is fixed to the end 24A in the longitudinal direction of the front bumper reinforcement 24 in a surface contact state.

  From the upper edge side of the mounting seat 54 of the said connection body 52, the elongate 1st connection member 62 is extended toward the vehicle diagonally upper side and back. The upper end 62A of the first connecting member 62 is bent in the vehicle front-rear direction so as to be connectable to the front end 30A of the upper member 30, and a bolt insertion hole 64 is formed in the top wall portion and the inner side wall portion. . Correspondingly, a weld nut 66 is fixed to the top wall portion and the inner side wall portion of the front end portion 30 </ b> A of the upper member 30. Further, bolt insertion holes 68 are formed in the top wall portion and the inner side wall portion of the outer end portion 44 </ b> A of the radiator support upper side 44.

  Then, after the upper end 62A of the first connecting member 62 of the connecting body 52 is fitted on the front end 30A of the upper member 30 from the vehicle upper side, the outer end 44A of the radiator support upper side 44 further extends from the vehicle upper side. The bolt 70 is inserted into the bolt insertion holes 68 and 64 in this order and screwed into the weld nut 66, whereby the upper end portion 62 </ b> A of the first connecting member 62 of the connecting body 52 is moved to the front end portion 30 </ b> A of the upper member 30. It is fixed to. With the above configuration, the longitudinal end portion 24 </ b> A of the front bumper reinforcement 24 and the upper member 30 are connected to each other via the first connecting member 62.

  Further, a substantially isosceles trapezoidal side wall portion 72 that extends obliquely rearward and inward in the vehicle width direction is integrally formed from the inner edge side of the mounting seat 54 of the coupling body 52. The rear end portion 72A of the side wall portion 72 is bent inward in the vehicle width direction. Further, triangular shaped openings 74 and 76 are formed in the upper and lower portions of the side wall 72 so as to be spaced apart from each other in the vertical direction. As a result, the side wall 72 extends along the vehicle rear side between the second connecting member 78 extending along the vehicle oblique rear upper side above the upper opening 74 and the upper and lower openings 74, 76. A third connecting member 80 that is present and a fourth connecting member 82 that extends along the obliquely lower rear side of the vehicle are integrally formed below the lower opening 76.

  Supplementally, the second connecting member 78 includes a portion extending obliquely rearward and inward in the vehicle width direction from the vicinity of the base of the first connecting member 62, and the fourth connecting member 82 is on the lower edge side of the mounting seat 54. The vehicle is also configured to include a portion that extends obliquely downward and rearward from the vehicle.

  A bolt insertion hole 84 is formed on the upper edge side of the rear end portion 72 </ b> A of the side wall portion 72. Correspondingly, a bolt insertion hole 86 is formed in the front wall portion of the outer end portion 38A of the radiator support upper 38, and a weld nut 88 is fixed to the back surface of the upper end portion 42A of the front side of the radiator support side 42. Has been. Also, a bolt insertion hole 90 is formed in the front side wall of the end portion 44B on the inner side of the radiator support upper side 44.

  Then, the outer end portion 38A of the radiator support upper 38 and the inner end portion 44B of the radiator support upper side 44 are fitted into the upper end portion 42C of the radiator support side 42 in this order from the vehicle upper side, and the bolt 92 is inserted through the bolt. The rear ends of the second connecting members 78 of the connecting body 52 are fixed to the upper ends 42 </ b> C of the radiator support side 42 by being inserted through the holes 90, 84, 86 in this order and screwed into the weld nut 88. With the above configuration, the longitudinal end portion 24 </ b> A of the front bumper reinforcement 24 and the outer end portion 38 </ b> A of the radiator support upper 38 are connected to each other via the second connecting member 78.

  In addition, a bulging portion 94 that bulges inward in the vehicle width direction is integrally formed at the height direction intermediate portion of the rear end portion 72A of the side wall portion 72. Four bolt insertion holes 96 are formed. Correspondingly, a total of four weld nuts 100 are fixed to the back side of the mounting seat 50 formed on the front side wall 42A of the radiator support side 42 at a position coaxial with the bolt insertion hole 96. Has been.

  Then, the rear end portion 72A of the side wall portion 72 of the connecting body 52 is brought into contact with the front side wall 42A of the radiator support side 42 so that the bolt 102 is inserted into the bolt insertion hole 96 and screwed into the weld nut 100. The rear end portion of the third connecting member 80 is fixed to the radiator support side 42.

  Further, the aforementioned crash box outer 20 is integrally formed on the inner side of the third connecting member 80 in the vehicle width direction. As described above, the substantially rectangular flat plate-like crash box inner 22 is joined to the open portion of the crash box outer 20 by spot welding. A pair of upper and lower bolt insertion holes 104 are formed in the front end portion 22A of the crash box inner 22, and correspondingly, a bolt insertion is provided on the inner side in the vehicle width direction of the longitudinal end portion 24A of the front bumper reinforcement 24. A bolt insertion hole 106 is formed at a position coaxial with the hole 104.

  Then, the front end portion of the crash box 18 is inserted into the inner section of the front bumper reinforcement 24, and the bolt 108 is inserted in the order of the bolt insertion holes 106 and 104 and screwed into the weld nut 4 of the radiator support side 42. Thus, the crash box 18 is fixed between the front bumper reinforcement 24 and the radiator support side 42.

  Further, the front end portion of the front side member 12 described above is arranged in contact with and coupled to the rear side of the bulging portion 98 of the radiator support side 42. Accordingly, in the assembled state, the front side member 12 and the crash box 18 are arranged on a straight line in the vehicle front-rear direction. With the above configuration, the longitudinal end 24 </ b> A of the front bumper reinforcement 24 and the front side member 12 are connected to each other via the third connecting member 80.

  Further, a pair of upper and lower bolt insertion holes 110 are formed at the lower end portion of the rear end portion 72 </ b> A of the side wall portion 72. Correspondingly, a weld nut 112 is fixed to the lower end portion of the front side wall 42 </ b> A of the radiator support side 42 coaxially with the bolt insertion hole 110.

  Then, by inserting the bolt 114 into the bolt insertion hole 110 and screwing it into the weld nut 112, the rear end portion of the fourth connecting member 82 is the lower end portion 42 </ b> D of the radiator support side 42 and thus the outer end of the radiator support lower 40. It is fixed to the part 40A. With the above configuration, the longitudinal end portion 24 </ b> A of the front bumper reinforcement 24 and the outer end portion 40 </ b> A of the radiator support lower 40 are coupled to each other via the fourth coupling member 82.

  FIG. 4 is a schematic view of a connecting body 52 that constitutes a main part of the present embodiment. As shown in this figure, in the vehicle body front part structure according to the present embodiment, the longitudinal end 24A of the front bumper reinforcement 24 is connected to the upper member 30 via the first connecting member 62, and the second It is connected to the radiator support upper 38 via a connecting member 78, is connected to the front side member 12 via a third connecting member 80, and is connected to the radiator support lower 40 via a fourth connecting member 82. Yes.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

<When a small lap collides>
FIG. 5 is a schematic plan view showing a state in which the collision body 116 has collided with the end 24A in the longitudinal direction of the front bumper reinforcement 24, that is, a portion located on the outer side in the vehicle width direction with respect to the front side member 12. It is shown.

  If the connecting body 52 of the present embodiment does not exist, the end 24A in the longitudinal direction of the front bumper reinforcement 24 is disposed in a cantilevered support state outside the front side member 12 in the vehicle width direction. become. Accordingly, the longitudinal end portion 24A of the front bumper reinforcement 24 is deformed to the vehicle rear side from the front end portion of the front side member 12, and it is difficult to transmit the load to other body portions.

  However, as in this embodiment, the longitudinal end portion 24A of the front bumper reinforcement 24 is connected to the upper member 30, the radiator support upper 38, the front side member 12, and the radiator support lower (lower cross member) via the coupling body 52. Since the four skeleton members (elements) 40 are connected and supported at four points, the collision load can be dispersed and transmitted (energy absorption) to these four members. Therefore, the amount of bending moment generated from the base of the end 24A in the longitudinal direction of the front bumper reinforcement 24 can be suppressed, and the amount of deformation of the end 24A in the longitudinal direction toward the vehicle rear side can be suppressed. be able to. As a result, according to the present embodiment, in the structure in which both end portions 24A in the longitudinal direction of the front bumper reinforcement 24 project in a cantilevered state outward from the front side member 12 in the vehicle width direction, a minute lap collision performance is achieved. Can be improved.

<When colliding with the inside of the front side member 12>
FIG. 6 is a schematic plan view showing a state in which the collision body 116 has collided in the vehicle width direction with respect to the front side member 12 in the front bumper reinforcement 24 (half-lap collision).

  In this case as well, as in the case of the above-described minute lap collision, the load input to the longitudinal end portion 24A of the front bumper reinforcement 24 is not limited to the upper member 30, the radiator support upper 38, the front side via the coupling body 52. Since the amount of energy absorption is increased by flowing to the four skeletal members (elements) of the member 12 and the radiator support lower (lower cross member) 40, the crash stroke of the crash box 18 is reduced accordingly.

  Further, the first connecting member 62 to the fourth connecting member 82 constituting the connecting body 52 are disposed on the vehicle front side from the cooling system 118, the headlamp 120, and the hood panel front end 122. Damage can be prevented. That is, according to the vehicle body front structure according to the present embodiment, it is possible to improve the damageability performance particularly in the low speed range.

<In case of full lap collision>
7A and 7B are schematic plan views showing a state in which the collision body 116 has collided with the substantially entire surface of the front bumper reinforcement 24 in the longitudinal direction (full lap collision).

  In FIG. 7A showing the conventional structure, the main portion 24B of the front bumper reinforcement 24 (the portion excluding both end portions 24A in the longitudinal direction) serves as a pressure-receiving surface for the collision load F. There is a possibility of deformation to the vehicle rear side.

  On the other hand, in FIG. 7B showing the vehicle body front part structure according to the present embodiment, the longitudinal end portions 24A of the front bumper reinforcement 24 are supported by the connecting body 52, and therefore the front bumper reinforcement 24 is used. In addition to the main portion 24B in the longitudinal direction, both end portions 24A in the longitudinal direction serve as pressure receiving surfaces for the collision load F. That is, the pressure receiving area can be increased as compared with the conventional structure. For this reason, according to the present embodiment, when a full lap collision occurs, not only the crash stroke of the crash box 18 due to the increase in the amount of energy absorption is reduced, but also the magnitude of the input load per unit area is reduced. Therefore, the load reaction force applied to the collision body 116 is also reduced, and the compatibility performance can be improved.

<Other effects>
In the vehicle body front structure according to the present embodiment, the first connecting member 62 to the fourth connecting member 82 are configured as an integrally molded product, and therefore each of the first connecting member 62 to the fourth connecting member 82 is an independent component. Compared to the case, the number of parts can be reduced. Accordingly, the number of parts that are damaged at the time of frontal collision in the low speed range can be reduced by the reduction in the number of parts. That is, if the number of parts is large, the number of parts damaged at the time of a frontal collision in the low speed region increases, so the number of parts replacement work also increases. You can replace it. Therefore, the number of parts that need to be replaced is reduced, and the burden of replacing damaged parts can be reduced.

  Moreover, in the vehicle body front part structure according to the present embodiment, the crash box outer 20 is also integrally formed with the coupling body 52, so that the work burden of the damaged parts described above can be further reduced. That is, even during a micro lap collision, since a collision load is normally input from the front bumper reinforcement 24 to the crash box 18, the crash box 18 has undergone axial compression plastic deformation to a greater or lesser extent. Become. Therefore, if the crash box 18 is integrally formed with the third connecting member 80 of the connecting body 52 from the beginning, damaged parts can be replaced together. As a result, according to the present embodiment, it is possible to improve the efficiency of component replacement work.

  Furthermore, in the vehicle body front structure according to the present embodiment, the connecting body 52 is fixed to the body side using fasteners such as bolts 60,... And weld nuts 56,. The connecting body 52 can be easily removed from the body side. Therefore, repairability can be improved. As a result, according to the present embodiment, the burden on the user can be reduced.

(Other embodiments)
FIG. 8 is a perspective view of a connecting body 130 according to another embodiment. In this connection body 130, the portions corresponding to the first connection member 62 to the fourth connection member 82 are divided, and the plate thicknesses of the first plate member 132 to the fourth plate member 138 constituting each of them are set arbitrarily, The first plate member 132 to the fourth plate member 138 are joined by laser welding and then press-molded to constitute the integrally connected body 130. In addition, the part shown with the dashed-dotted line in FIG. 8 is the boundary line of the 1st board | plate material 132 thru | or the 4th board | plate material 138. FIG.

  Incidentally, in this example, the plate thickness of the first plate member 132 is set to be the thickest, the plate thicknesses of the second plate member 134 and the fourth plate member 138 are set to normal thicknesses, and the plate thickness of the third plate member 136 is medium. The thickness is set.

  According to the coupling body 130 having the differential thickness coupling structure configured as described above, the energy absorption performance can be controlled (tuned) for each element of the first coupling member 62 to the fourth coupling member 82, and as a result, desired energy can be obtained. The coupling body 130 having an absorption characteristic can be easily obtained.

[Supplementary explanation of the embodiment]
In the above-described embodiment, the first connecting member 62 to the fourth connecting member 82 are integrally formed to manufacture the connecting bodies 52 and 130. However, the present invention is not limited to this, and the first connecting member 62 to the fourth connecting member are manufactured. It is sufficient that at least one element of the member 82 is provided. Therefore, a connection body in which the three elements from the first connection member 62 to the third connection member 80 are integrally formed may be used, or the two elements of the first connection member 62 and the second connection member 78 are integrally formed. A linked body may be used.

  Moreover, in this embodiment mentioned above, although all the elements of the 1st connection member 62 thru | or the 4th connection member 82 were shape | molded integrally, not only this but each element is set independently (as FIG. 4 shows). Configuration).

  Further, in the present embodiment described above, in order to improve the repairability performance, the bolt 60,... And the weld nut 56,. It may be fixed to the body side. Further, a normal nut may be used without necessarily forming the weld nut 56.

FIG. 3 is an enlarged perspective view showing an assembled state of main parts of the vehicle body front structure according to the present embodiment. (A) is a top view of the principal part of the vehicle body front part structure shown by FIG. 1, (B) is the same front view, (C) is the same side view. It is a disassembled perspective view of the principal part of the vehicle body front part structure concerning this embodiment. It is the expansion perspective view corresponding to FIG. 1 which modeled the coupling body. It is a top view for demonstrating the effect | action (in the case of a micro lap collision) of the vehicle body front part structure which concerns on this embodiment. It is a top view for demonstrating the effect | action (in the case of a half lap collision) of the vehicle body front part structure which concerns on this embodiment. It is a top view for demonstrating the effect | action (in the case of a full wrap collision) of the vehicle body front part structure which concerns on this embodiment in contrast with the conventional structure. It is an expansion perspective view which shows the coupling body which concerns on another embodiment using difference thickness coupling | bonding.

Explanation of symbols

10 Car body front 12 Front side member 18 Crash box (energy absorbing member, front end of front side member)
20 Crash box outer (part of energy absorbing member)
24 Front bumper reinforcement 24A Longitudinal end 30 Upper member 36 Radiator support 38 Radiator support upper (upper edge)
40 Radiator support lower (lower edge)
44 Radiator support upper side (upper edge)
52 Connector 56, 66, 88, 100, 112 Weld nut (fastener)
60, 70, 92, 102, 108, 114 Bolt (fastener)
62 1st connection member 78 2nd connection member 80 3rd connection member 82 4th connection member 116 Colliding body 130 Connection body 132 1st board | plate material 134 2nd board | plate material 136 3rd board | plate material 138 4th board material

Claims (5)

A pair of left and right front side members arranged along the vehicle longitudinal direction on both sides of the front part of the vehicle body;
These are arranged along the vehicle width direction so as to be spanned between the front end portions of the front side members, and are respectively coupled to the front end portions of the front side members, and further, both end portions in the longitudinal direction are connected to the vehicle more than the front side members. A front bumper reinforcement projecting out in a cantilevered state to the outside in the width direction;
An upper member that is spaced apart above the pair of left and right front side members and extends along the vehicle longitudinal direction;
An upper edge portion that is spaced apart on the vehicle rear side of the front bumper reinforcement and has both longitudinal ends coupled to the front end portion of the upper member, and a lower edge that is disposed substantially parallel to the vehicle lower side of the upper edge portion A radiator support including a part,
A vehicle body front part structure applied to a vehicle body front part comprising:
A first connecting member for connecting the upper member and a longitudinal end portion of the front bumper reinforcement; a second connecting member for connecting an upper edge portion of the radiator support and a longitudinal end portion of the front bumper reinforcement; A third connecting member that connects the front side member and a longitudinal end portion of the front bumper reinforcement, and a lower edge portion of the radiator support and a longitudinal end portion of the front bumper reinforcement. Comprising at least one element of a fourth connecting member;
A vehicle body front structure characterized by that. Two or more elements of the first connecting member to the fourth connecting member are formed as an integrally molded product.
The vehicle body front part structure according to claim 1. The integrally molded product is configured to include the third connecting member,
The third connecting member includes a part of a cylindrical energy absorbing member that is interposed between the front end portion of the front side member and the front bumper reinforcement and is subjected to axial compression plastic deformation by a load input of a predetermined value or more. Formed integrally,
The vehicle body front part structure according to claim 2. The two or more elements that are integrally molded are set to have a difference in plate thickness due to differential thickness bonding.
The vehicle body front part structure according to claim 2 or claim 3, wherein The elements provided in the first connecting member to the fourth connecting member are detachably fixed to the corresponding skeleton members using fasteners,
The vehicle body front part structure according to any one of claims 1 to 4, wherein the vehicle body front part structure is provided.

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