JP5808728B2 - Front frame structure for vehicles - Google Patents

Description

  The present invention relates to a vehicle front skeleton structure, and more particularly to a technique for suitably absorbing the impact load when an impact load is applied to the vehicle front skeleton structure.

  The front skeleton structure for a vehicle includes a side skeleton member disposed along a vehicle front-rear direction from a lower portion of a front pillar of the vehicle, a frame-shaped radiator support member disposed in a vehicle width direction, and the radiator support. Some include a radiator support upper side member that connects a radiator support connecting portion provided on both sides of the member in the vehicle width direction and a front end portion of the side frame member. For example, the vehicle front skeleton structure shown in Patent Documents 1 and 2 is that.

  In the vehicle front skeleton structure as described above, in Patent Document 1, a notch-shaped attachment hole that opens downward is provided at the rear end portion of the radiator support upper side member, and the front end of the side skeleton member is provided. The stud is provided with a shaft portion of a stud bolt that is fitted into the mounting hole, and a nut is screwed onto the shaft portion of the stud bolt to tighten the rear end portion of the radiator support upper side member. The front end portions of the side frame members are fixed to each other. For this reason, when an impact load including a downward direction component of a predetermined size or more is applied to the vehicle front skeleton structure, the shaft portion of the stud bolt is detached from the mounting hole, and the radiator support upper side The rear end portion of the member falls off from the front end portion of the side skeleton member, and the impact load is absorbed.

  Moreover, in patent document 2, the front-end part of the said side part frame member is fixed to the rear-end part of the said radiator support upper side member through the 2nd weak part formed thinly by providing a V-shaped groove | channel. ing. For this reason, when an impact load including a downward direction component of a predetermined size or more is applied to the vehicle front skeleton structure, the second weakened portion breaks and the rear end portion of the radiator support upper side member Falls off from the front end of the side frame member and the impact load is absorbed.

JP 2007-331614 A JP 2005-145271 A

  However, in the vehicle front skeleton structure as in Patent Document 1, if the rear end portion of the radiator support member falls off from the front end portion of the side skeleton structure due to the impact load, thereafter, Since the impact load cannot be absorbed due to deformation of the member or the like, there is a problem that the impact load cannot be suitably absorbed. Further, in the vehicle front skeleton structure as described in Patent Document 2, if the rear end portion of the radiator support member falls off from the front end portion of the side skeleton structure due to the impact load, the member Since the impact load cannot be absorbed due to deformation or the like, the impact load cannot be favorably absorbed.

  The present invention has been made in the background of the above circumstances, and its object is to provide a front skeleton structure for a vehicle that can absorb an impact load more suitably than in the past. It is in.

  In order to achieve such an object, the gist of the present invention is that (a) a side skeleton member disposed along the vehicle front-rear direction from the lower part of the front pillar of the vehicle, and the vehicle body width direction. A vehicle comprising: a frame-shaped radiator support member; and a radiator support upper side member that connects between a radiator support connecting portion provided on both sides of the radiator support member in a vehicle width direction and a front end portion of the side frame member. (B) The front end portion of the side skeleton member has a height that forms a step that becomes lower than the side wall of the portion adjacent to the rear end side of the front end portion of the side skeleton member. (C) a rear end portion of the radiator support upper side member includes a pair of second connection side walls and an upper end portion of the pair of second connection side walls. 2nd on connecting And (d) a gap is formed between the upper ends of the pair of first connecting side walls and the second upper wall. And generating a surface pressure between an outer wall surface of the pair of first connection side walls and an inner wall surface of the pair of second connection side walls, and the front end portion of the side frame member and the radiator support upper. The rear end portions of the side members are fixed to each other, and when an impact load including a downward direction component of a predetermined size or more is applied, the second connection side wall is more than the first connection side wall. It is in including the 1st coupling device which accept | permits a downward relative displacement.

  According to the vehicle front skeleton structure of the present invention, (b) the front end portion of the side skeleton member is lower than the side wall of the portion adjacent to the rear end side of the front end portion of the side skeleton member. And (c) a rear end portion of the radiator support upper side member includes a pair of second connection side walls and a pair of second connection side walls. A second upper wall integrally connecting the upper end portions of the first U-shaped cross section and having an inverted U-shaped cross section that opens downward, and (d) the upper ends of the pair of first connecting side walls and the In a state where a gap is formed between the second upper walls, a surface pressure is generated between an outer wall surface of the pair of first connection side walls and an inner wall surface of the pair of second connection side walls, and The front end portion of the side skeleton member and the rear end portion of the radiator support upper side member are fixed to each other so that the size is not less than a predetermined size. A first coupling device that allows relative downward displacement of the second connecting side wall to the first connecting side wall when an impact load is applied, including a direction component directed to is to contain. For this reason, when the impact load including a downward direction component having a size greater than or equal to the predetermined size is applied, the first connecting device causes the second connecting side wall to be moved with respect to the first connecting side wall. The rear end of the radiator support upper side member is allowed to be displaced downward relative to the front end of the side frame member, and the impact load is applied to the radiator support upper side member from the radiator support upper side member. Transmitted to the side skeleton member. Thus, the impact load can be suitably absorbed as compared with the conventional case where the rear end portion of the radiator support member falls off the front end portion of the side skeleton structure due to the impact load.

  Here, it is preferable that the first connecting device includes a pair of second long side walls formed in the pair of second connecting side walls that are longer in the vertical direction than the vehicle front-rear direction, and the pair of second through the first long holes. A pair of first fastening bolts that are screwed into the first connecting side wall to generate the surface pressure, and the shaft portion of the first fastening bolt is moved within the first elongated hole to thereby provide the first connecting bolt. A relative displacement downward of the second connecting side wall with respect to the side wall is allowed. For this reason, the collision load that allows the relative displacement of the rear end portion of the radiator support upper side member to the lower end with respect to the front end portion of the side skeleton member is set to a tightening torque or the like of the pair of first fastening bolts. Can be adjusted by setting.

  Preferably, (a) the radiator support connecting portion protrudes laterally from both sides in the vehicle width direction of the radiator support member and becomes a step which becomes lower than a side wall of a portion adjacent to the radiator support connecting portion. And (b) a front end portion of the radiator support upper side member includes a pair of fourth connection side walls and a pair of the fourth connection side walls. A fourth upper wall integrally connecting the upper end portions and having an inverted U-shaped cross section that opens downward; (c) the upper ends of the pair of third connecting side walls and the first In the state where a gap is formed between the four upper walls, a surface pressure is generated between an outer wall surface of the pair of third connecting side walls and an inner wall surface of the pair of fourth connecting side walls to thereby form the radiator. The front end of the support upper side member and the radiator support To the third connecting side wall when an impact load including a downward direction component of a predetermined size or more is applied to the third connecting side wall. A second connecting device that allows relative displacement is included. For this reason, when the impact load including a downward direction component having a predetermined size or more is applied, the second connecting device causes the fourth connecting side wall to be moved with respect to the third connecting side wall. The front end of the radiator support upper side member is allowed to be displaced downward with respect to the radiator support connecting portion, so that the vehicle front when the pedestrian collides with the front of the vehicle is allowed. The range of protection of the walking vehicle in the partial skeleton structure can be suitably expanded.

  Preferably, the second connecting device includes a second elongated hole formed in the pair of fourth connecting side walls longer in the vertical direction than the horizontal direction, and the pair of third holes through the second elongated hole. A pair of second fastening bolts that are screwed into the connecting side wall to generate the surface pressure, and by moving the shaft portion of the second fastening bolt within the second elongated hole, On the other hand, the relative displacement downward of the fourth connecting side wall is allowed. For this reason, the collision load that allows the relative displacement of the rear end portion of the radiator support upper side member to the lower side with respect to the front end portion of the side skeleton member is applied to the pair of first fastening bolts and the pair of first engagement bolts. 2 It can be adjusted by setting the fastening torque of the fastening bolt.

It is a perspective view which shows a part of vehicle front part frame structure to which this invention was applied. FIG. 2 is an enlarged perspective view of a portion between a front end portion of a side skeleton member and a rear end portion of a radiator support upper side member in the vehicle front skeleton structure of FIG. 1, that is, a portion indicated by an arrow A in FIG. 1. . FIG. 3 is a perspective view showing a state before a front end portion of a side skeleton member and a rear end portion of a radiator support upper side member are connected in FIG. 2. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2 and shows a state in which an impact load including a downward direction component having a predetermined size or more is applied to the vehicle front skeleton structure in FIG. 1. It is a figure which shows the state which the rear-end part of the radiator support upper side member was relatively displaced below with respect to the front-end part of a side part frame member by the impact load of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 4. It is a perspective view which shows a part of front frame structure for vehicles of the other Example of this invention. FIG. 8 is an enlarged perspective view of a portion between the radiator support connecting portion and the front end portion of the radiator support upper side member in the vehicle front skeleton structure in FIG. 7, that is, a portion indicated by an arrow B in FIG. 7. It is a figure which shows the state before a connection part and the front-end part of a radiator support upper side member are connected. FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. 8 in a state where the radiator support connecting portion and the front end portion of the radiator support upper side member are connected, and an impact load including a downward direction component of a predetermined size or more is applied to FIG. It is a figure which shows the state added to the front frame structure for vehicles. It is a figure which shows the state which the front-end part of the radiator support upper side member was displaced relatively below with respect to the radiator support connection part by the impact load of FIG. It is the XI-XI sectional view taken on the line of FIG. It is a figure which shows the front part frame structure for vehicles of the other Example of this invention, and is a figure corresponding to FIG. It is a figure which shows the front part frame structure for vehicles of the other Example of this invention, and is a figure corresponding to FIG. 6, FIG. It is a figure which shows the front part frame structure for vehicles of the other Example of this invention, and is a figure corresponding to FIG.6, FIG.12, FIG.13. It is a figure which shows the front frame structure for vehicles of the other Example of this invention, and is a figure corresponding to FIG. 6, FIG. 12 thru | or FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified for easy understanding, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a perspective view showing a part of a vehicle front skeleton structure (vehicle front skeleton structure) 10 to which the present invention is applied. As shown in FIG. 1, the front skeleton structure 10 includes a pair of longitudinal side skeleton members 12 disposed along a vehicle front-rear direction FR from a lower portion of a front pillar (not shown) of the vehicle, and a vehicle width direction. A frame-shaped radiator support member 14 disposed on the LR, a radiator support connecting portion 14a provided on both sides of the radiator support member 14 in the vehicle width direction LR, and an end of the side frame member 12 on the radiator support member 14 side And a pair of longitudinal radiator support upper side members 16 that are connected to each other, that is, the front end portion 12a. The radiator support connecting portion 14a and the end of the radiator support upper side member 16 on the radiator support member 14 side, that is, the front end portion 16a are integrally connected, for example, by spot welding or the like, and the radiator support member 14 and the pair of radiators are connected. The support upper side member 16 is manufactured as an integral body.

  The radiator support member 14 supports a radiator body (not shown) that cools the cooling fluid for cooling the engine. As shown in FIG. 1, the radiator support member 14 includes a radiator support upper 14 b that is elongated in the vehicle width direction LR and disposed substantially horizontally, and a lower side of the radiator support upper 14 b, that is, on the road surface side. A longitudinal radiator support lower 14c disposed substantially in parallel and a pair of longitudinal radiator support sides 14d and 14e respectively connecting both ends of the radiator support lower 14c and the radiator support upper 14b are integrally provided. It has been. A bracket 18 is fixed to each intermediate portion of the pair of radiator support sides 14d and 14e, and a front side member (not shown) and the radiator support member 14 are connected to each other via the bracket 18. ing.

  As shown in FIG. 2, between the front end portion 12a of the side skeleton member 12 and the end portion on the side skeleton member 12 side of the radiator support upper side member 16, that is, the rear end portion 16b, the side skeleton member 12 is provided. When an impact load F including a directional component of a predetermined size or more is applied to the front skeleton structure 10 between the front end 12a of the radiator and the rear end 16b of the radiator support upper side member 16 Further, a first connecting device 20 is provided that allows a relative displacement of the rear end portion 16b of the radiator support upper side member 16 downward relative to the front end portion 12a of the side frame member 12. In addition, the 1st connection apparatus 20 is similarly provided between the front-end part 12a of a pair of side part frame member 12, and the rear-end part 16b of a pair of radiator support upper side member 16, respectively. Therefore, in the present embodiment, only the first connecting device 20 on the left side, that is, the radiator support side 14d side shown in FIG. 1 will be described below.

  As shown in FIG. 2, the front end portion 12 a of the side skeleton member 12 has a height that forms a step that becomes lower than the side wall 12 b of the portion adjacent to the rear end side of the front end portion 12 a of the side skeleton member 12. A pair of first connecting side walls 12c and 12d of H1 and a first upper wall 12e that connects between the pair of first connecting side walls 12c and 12d are integrally provided, and a cross-sectional view that opens downward is symmetrical. It is formed in an inverted U shape. The side skeleton member 12 extends from the front end portion of the front pillar (not shown) in the longitudinal direction in the vehicle front-rear direction FR, and supports the fender outer panel via a fender bracket (not shown).

  As shown in FIG. 3, the front end portion 12a of the side skeleton member 12 has an insertion hole 12f that passes through the pair of first connecting side walls 12c and 12d in a circular shape, and a female screw that communicates with the insertion hole 12f. A pair of first weld nuts 22 each having a hole 22a and fixed by welding inside the pair of first connecting side walls 12c and 12d are provided.

  As shown in FIGS. 2 and 3, the rear end portion 16b of the radiator support upper side member 16 includes a pair of second connecting side walls 16c and 16d facing each other, and a pair of second connecting side walls 16c and 16d. A second upper wall 16e that joins between the upper end portions and a flange portion 16f in which the end portions of the second connecting side walls 16c and 16d are bent in parallel with the second upper wall 16e are integrally provided. The cross section is formed in a left-right symmetric inverted U-shape or a hat shape that opens downward. The radiator support upper side member 16 supports, for example, a headlamp (not shown), a fender bracket (not shown), or a hood cushion (not shown) such as rubber.

  As shown in FIGS. 3 to 6, the pair of second connection side walls 16c and 16d at the rear end portion 16b of the radiator support upper side member 16 are arranged in the vertical direction, that is, the second connection side wall 16c, rather than the vehicle longitudinal direction FR. The first elongated holes 16g formed long in the width direction of 16d are formed. As shown in FIGS. 3 and 6, the first elongated hole 16g is arranged in the vehicle longitudinal direction from the lower end portion on the flange 16f side of the first elongated hole 16g toward the upper end portion on the second upper wall 16e side. The width dimension D1 in the FR is formed to be large. Further, the width dimension D1 at the lower end portion on the flange portion 16f side of the first elongated hole 16g is a pair of first portions that fasten the front end portion 12a of the side frame member 12 and the rear end portion 16b of the radiator support upper side member 16. It is set to be slightly larger than the diameter R1 of the shaft portion 24a of the fastening bolt 24 and sufficiently smaller than the diameter R2 of the disc-shaped washer 26 of the first fastening bolt 24, and the second elongated hole 16g has a second diameter. The width dimension D1 at the upper end portion on the upper wall 16e side is set to be larger than the diameter R1 of the shaft portion 24a of the first fastening bolt 24 and smaller than the diameter R2 of the washer 26. The width D1 of the upper end portion of the first elongated hole 16g is smaller than the diameter R2 of the washer 26, so that the radiator support upper side member 16 is preferably prevented from falling off in the event of a collision. Compared with the case where the member 16 is dropped, the first fastening bolt 24 is repaired by realigning the first fastening bolt 24 after aligning the position so that the shaft portion 24a of the first fastening bolt 24 is disposed at the lower end portion of the first elongated hole 16g. It is excellent in repairability.

  2 and 4, the distance E1 between the pair of second connecting side walls 16c and 16d at the rear end 16b of the radiator support upper side member 16 and the inner wall surface 16h of the side support skeleton member 12 is as follows. The front end 12a is designed to be equal to or slightly larger than the distance E2 between the pair of first connecting side walls 12c and 12d and the outer wall surface 12g, and between the first upper wall 12e and the second upper wall 16e. The rear end portion 16b of the radiator support upper side member 16 is overlapped with the front end portion 12a of the side frame member 12 with the gap G1 formed.

  Further, as shown in FIG. 3, the rear end portion 16b of the radiator support upper side member 16 is placed on the side frame member 12 so that a gap G1 is formed between the first upper wall 12e and the second upper wall 16e. When the first fastening bolt 24 is passed through the first elongated hole 16g and screwed into the first weld nut 22 so as to overlap the front end portion 12a, the pair of first connection side walls 12c and 12d and the pair of outer wall surfaces 12g and a pair of A surface pressure is generated between the inner wall surfaces 16h of the second connecting side walls 16c and 16d, and the front end portion 12a of the side frame member 12 and the rear end portion 16b of the radiator support upper side member 16 are fixed to each other. The When the impact load F is applied from above, the tightening torque of the first fastening bolt 24 is such that the outer wall surface 12g of the first connecting side walls 12c and 12d and the inner wall surface 16h of the second connecting side walls 16c and 16d It is tightened at a value set in advance based on experiments or the like so as to obtain a surface pressure of a magnitude that allows the sliding of the surface. The first fastening bolt 24 is screwed into the first weld nut 22 in a state where the shaft portion 24a is inserted into the lower end portion of the first elongated hole 16g on the flange portion 16f side.

  According to the first coupling device 20 of the front skeleton structure 10 configured as described above, for example, a collision body such as a pedestrian collides with the hood of the vehicle, and the pair of first couplings of the side skeleton members 12 occurs. The lower wall 12c and 12d and the radiator support upper side member 16 are directed downward by a predetermined magnitude or more larger than the frictional force generated between the pair of second connecting side walls 16c and 16d. When a collision load F including a directional component is applied to the radiator support upper side member 16, the rear end portion 16 b of the radiator support upper side member 16 is relatively displaced downward relative to the front end portion 12 a of the side frame member 12, that is, the first. By moving the shaft portion 24a of the fastening bolt 24 within the first elongated hole 16g, the second connecting side walls 16c and 16d are changed to the first connecting side wall 12c and With relatively displaced downward relative to 2d, the impact load F is transmitted to the side frame member 12 through the first fastening bolt 24 from the radiator support upper side member 16. As shown in FIG. 5, when the second upper wall 16 e of the radiator support upper side member 16 comes into contact with the first upper wall 12 e of the side frame member 12 by being relatively displaced downward, the radiator support upper side member 16 is curved in the longitudinal direction and is deformed so that the opening in the cross section of the radiator support upper side member 16 is further opened.

  As described above, according to the front skeleton structure 10 of the present embodiment, the front end portion 12a of the side skeleton member 12 is the side wall 12b of the portion adjacent to the rear end side of the front end portion 12a of the side skeleton member 12. A pair of first connecting side walls 12c and 12d having a height H1 that forms a step which becomes lower than the first upper wall 12e connecting the upper ends of the pair of first connecting side walls 12c and 12d. The rear end portion 16b of the radiator support upper side member 16 is a second connecting portion between the pair of second connecting side walls 16c and 16d and the upper ends of the pair of second connecting side walls 16c and 16d. It has an inverted U-shaped cross section that has an upper wall 16e integrally and opens downward, and a gap G1 is formed between the first upper wall 12e and the second upper wall 16e. The pair of first connecting side walls 12 And a rear end of the radiator support upper side member 16 by generating a surface pressure between the outer wall surface 12g of 12d and the inner wall surface 16h of the pair of second connecting side walls 16c and 16d. The second connecting side walls 16c and 16d are fixed to the first connecting side walls 12c and 12d when an impact load F including a downward direction component having a predetermined size or more is applied. A first connecting device 20 that allows a relative displacement downward. For this reason, when an impact load F including a downward direction component of a predetermined size or more is applied, the first connecting device 20 causes the second connecting side wall to be connected to the first connecting side walls 12c and 12d. A downward relative displacement of 16c and 16d is allowed and the rear end portion 16b of the radiator support upper side member 16 is displaced downward with respect to the front end portion 12a of the side frame member 12, and the impact load F is applied to the radiator. It is transmitted from the support upper side member 16 to the side skeleton member 12. Thereby, the impact load F can be suitably absorbed by the impact load F as compared with the conventional case where the rear end portion 16b of the radiator support upper side member 16 falls off from the front end portion 12a of the side frame member 12. it can. Further, after the rear end portion 16b of the radiator support upper side member 16 is displaced downward with respect to the front end portion 12a of the side skeleton member 12, the second upper wall 16e abuts on the first upper wall 12e. Since the radiator support upper side member 16 is deformed, the impact load F can be absorbed appropriately.

  Further, according to the front skeleton structure 10 of the present embodiment, the first connecting device 20 includes a first elongated hole formed in the pair of second connecting side walls 16c and 16d so that the vertical direction is longer than the vehicle front-rear direction FR. 16 g and a pair of first fastening bolts 24 that are screwed into a first weld nut 22 fixed by welding to the pair of first connecting side walls 12 c and 12 d through the first elongated hole 16 g to generate a surface pressure. And by moving the shaft portion 24a of the first fastening bolt 24 within the first elongated hole 16g, the second connecting side walls 16c and 16d are displaced relative to each other downward with respect to the first connecting side walls 12c and 12d. It is acceptable. For this reason, the collision load F that allows the relative displacement of the rear end portion 16b of the radiator support upper side member 16 downward relative to the front end portion 12a of the side frame member 12 is set to the tightening torque of the pair of first fastening bolts 24. Etc. can be adjusted by setting.

  Next, another embodiment of the present invention will be described in detail with reference to the drawings. In the following description, parts common to the embodiments are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 7 to 11, the front skeleton structure (vehicle front skeleton structure) 28 of the present embodiment is paired with the radiator support connecting portion 14a in comparison with the front skeleton structure 10 of the first embodiment. The front end 16a of the radiator support upper side member 16 is connected to each other by a pair of second fastening bolts 30, and the radiator support connecting portion 14a and the front end 16a of the pair of radiator support upper side members 16 are connected to each other. The second connecting device 32 is provided with a second connecting device 32 having substantially the same function as the first connecting device 20 of the first embodiment, and the rest is substantially the same as the front skeleton structure 10 of the first embodiment. It is.

  The second connecting device 32 connects the radiator support connecting portion 14a and the front end portion 16a of the radiator support upper side member 16, and an impact load F including a downward direction component having a predetermined size or more is applied. Sometimes, relative displacement of the radiator support upper side member 16 to the lower side of the front end portion 16a with respect to the radiator support connecting portion 14a is allowed. The second connecting device 32 is similarly provided between the radiator support connecting portion 14 a and the front end portions 16 a of the pair of radiator support upper side members 16. For this reason, in the present embodiment, only the second coupling device 32 on the left side, that is, the radiator support side 14d side shown in FIG. 7 will be described below.

  As shown in FIG. 8, the radiator support connecting portion 14a protrudes laterally from both sides of the radiator support upper 14b of the radiator support member 14 in the vehicle width direction LR and is adjacent to the radiator support connecting portion 14a. The pair of third connecting side walls 14g and 14h having a height H2 that forms a step that is lower than the third upper side wall 14i that connects between the pair of third connecting side walls 14g and 14h are integrally formed. Provided, and the cross section is formed in a symmetrical inverted U shape that opens downward. Further, as shown in FIGS. 8 and 9, the radiator support connecting portion 14a communicates with a pair of third connecting side walls 14g and 14h in a circular shape and a through hole 14j. A pair of second weld nuts 34 each having a female screw hole 34a and fixed by welding inside the pair of third connecting side walls 14g and 14h are provided.

  As shown in FIGS. 8 and 9, the front end portion 16a of the radiator support upper side member 16 includes a pair of fourth connecting side walls 16i and 16j facing each other and upper ends of the pair of fourth connecting side walls 16i and 16j. A fourth upper wall 16k that joins the first and second portions, and a flange portion 16l in which the tip ends of the fourth connecting side walls 16i and 16j are bent substantially in parallel with the fourth upper wall 16k. The cross section is formed in a symmetrical inverted U-shape or hat shape that opens downward.

  As shown in FIGS. 8 and 9, the pair of fourth connecting side walls 16i and 16j at the front end portion 16a of the radiator support upper side member 16 has a horizontal direction, that is, a fourth direction, that is, a fourth direction, that is, a fourth direction. Second long holes 16m formed in the width direction of the connecting side walls 16i and 16j are respectively formed. As shown in FIG. 8 and FIG. 11, the second elongated hole 16m extends from the lower end portion on the flange portion 16l side of the second elongated hole 16m to the fourth upper wall 16k as in the first elongated hole 16g of the first embodiment. The width dimension D2 in the vehicle width direction LR is formed to increase toward the upper end portion on the side. Further, the width dimension D2 at the lower end portion of the second elongated hole 16m on the flange portion 16l side is slightly larger than the diameter R3 of the shaft portion 30a of the second fastening bolt 30, and the disk-like shape of the second fastening bolt 30. It is set smaller than the diameter R4 of the washer 36, and the width dimension D2 at the upper end portion of the second elongated hole 16m on the fourth upper wall 16k side is larger than the diameter R3 of the shaft portion 30a of the second fastening bolt 30 and It is set smaller than the diameter R4 of the washer 36. In addition, when the width D2 of the upper end portion of the second long hole 16m is smaller than the diameter R4 of the washer 36, the radiator support upper side member 16 is preferably prevented from falling off during a collision, and in the case of a slight collision, the radiator support upper side Compared with the case where the member 16 is dropped, the second fastening bolt 30 is repaired by re-tightening the second fastening bolt 30 by aligning the position so that the shaft portion 30a of the second fastening bolt 30 is disposed at the lower end of the second elongated hole 16m. It is excellent in repairability.

  As shown in FIGS. 8 and 9, the distance E3 between the pair of fourth connecting side walls 16i and 16j at the front end portion 16a of the radiator support upper side member 16 and the inner wall surface 16n of the radiator supporting upper side member 16 is equal to the pair at the radiator support connecting portion 14a. Is designed to be equal to or slightly larger than the distance E4 between the third connecting side walls 14g and 14h and the outer wall surface 14k, and a gap G2 is formed between the third upper wall 14i and the fourth upper wall 16k. In this state, the front end portion 16a of the radiator support upper side member 16 is overlapped with the radiator support connecting portion 14a.

  Further, as shown in FIG. 8, the front end portion 16a of the radiator support upper side member 16 is overlapped with the radiator support connecting portion 14a so that a gap G2 is formed between the third upper wall 14i and the fourth upper wall 16k. In addition, when the second fastening bolt 30 is threaded into the second weld nut 34 through the second elongated hole 16m, the pair of third connecting side walls 14g and 14h and the pair of fourth connecting side walls A surface pressure is generated between the inner wall surfaces 16n of 16i and 16j, and the radiator support connecting portion 14a and the front end portion 16a of the radiator support upper side member 16 are fixed to each other. When the impact load F is applied from above, the tightening torque of the second fastening bolt 30 is such that the outer wall surface 14k of the third connecting side walls 14g and 14h and the inner wall surface 16n of the fourth connecting side walls 16i and 16j It is tightened at a value set in advance based on experiments or the like so as to obtain a surface pressure of a magnitude that allows the sliding of the surface. Further, the second fastening bolt 30 is screwed into the second weld nut 34 in a state where the shaft portion 30a is inserted into the lower end portion of the second elongated hole 16m on the flange portion 16l side.

  According to the second coupling device 32 of the front skeleton structure 28 configured as described above, for example, a collision body such as a pedestrian collides with the hood of the vehicle, and the pair of third couplings of the radiator support coupling portion 14a. The lower side wall 14g and the outer wall surface 14k of the side wall 14h and a pair of fourth connecting side walls 16i and 16j of the radiator support upper side member 16 are directed downward by a magnitude larger than a predetermined friction force generated between the inner wall surfaces 16n of the pair of side walls 16i and 16j. When a collision load F including a directional component is applied to the radiator support upper side member 16, the front end portion 16a of the radiator support upper side member 16 is relatively displaced downward with respect to the radiator support connecting portion 14a, that is, the shaft of the second fastening bolt 30. The fourth connecting side walls 16i and 16j are moved to the third connecting side by moving the portion 30a in the second elongated hole 16m. Relatively displaced downward relative 14g and 14h. As shown in FIG. 10, when the fourth upper wall 16k of the radiator support upper side member 16 abuts against the third upper wall 14i of the radiator support connecting portion 14a by relative displacement downward, the radiator support upper side member 16 is deformed.

  As described above, according to the front skeleton structure 28 of the present embodiment, the radiator support connecting portion 14a protrudes from the both sides in the vehicle width direction LR of the radiator support member 14 to the side, and is connected to the radiator support connecting portion 14a. A pair of third connecting side walls 14g and 14h having a height H2 that forms a step which becomes lower than the side wall 14f of the adjacent portion and the upper ends of the pair of third connecting side walls 14g and 14h are coupled to each other. The front end 16a of the radiator support upper side member 16 is between the pair of fourth connecting side walls 16i and 16j and the upper ends of the pair of fourth connecting side walls 16i and 16j. And the fourth upper wall 16k integrally connecting each other and having an inverted U-shaped cross section that opens downward, and the second connecting device 32 includes the third upper wall 14i. With the gap G2 formed between the fourth upper wall 16k and the outer wall surface 14k of the pair of third connecting side walls 14g and 14h and the inner wall surface 16n of the pair of fourth connecting side walls 16i and 16j. The front end portion 16a of the radiator support upper side member 16 and the radiator support connecting portion 14a are connected to each other by generating a surface pressure therebetween, and an impact load F including a downward direction component of a predetermined size or more is applied. In this case, the fourth connecting side walls 16i and 16j are allowed to be displaced relative to the third connecting side walls 14g and 14h. For this reason, when an impact load F including a downward direction component having a predetermined size or more is applied, the second connecting device 32 causes the fourth connecting side wall to be connected to the third connecting side walls 14g and 14h. Since the downward relative displacement of 16i and 16j is permitted and the front end portion 16a of the radiator support upper side member 16 is displaced downward with respect to the radiator support connecting portion 14a, the pedestrian collides with the front portion of the vehicle. The range of protection of pedestrians in the front skeleton structure 28 can be suitably expanded.

  Further, according to the front skeleton structure 28 of the present embodiment, the second connecting device 32 includes the second elongated holes 16m formed in the pair of fourth connecting side walls 16i and 16j longer in the vertical direction than in the horizontal direction. And a pair of second fastening bolts 30 that are screwed into the second weld nuts 34 fixed to the pair of third connecting side walls 14g and 14h through the second elongated holes 16m to generate a surface pressure. 2 By moving the shaft portion 30a of the fastening bolt 30 within the second elongated hole 16m, relative displacement of the fourth connecting side walls 16i and 16j downward relative to the third connecting side walls 14g and 14h is permitted. is there. For this reason, the collision load F that allows the lower end of the rear end portion 16b of the radiator support upper side member 16 to be displaced downward relative to the front end portion 12a of the side skeleton member 12 is applied to the pair of first fastening bolts 24 and the pair of paired fastening bolts 24. It can be adjusted by setting the tightening torque or the like of the second fastening bolt 30.

  As shown in FIG. 12, the front skeleton structure of the present embodiment has a first elongated hole 16o formed in the second connecting side walls 16c and 16d as compared with the front skeleton structure 10 of the first embodiment. The shape is different from the shape of the first elongated hole 16g of the first embodiment, and the other is substantially the same as the front skeleton structure 10 of the first embodiment.

  As shown in FIG. 12, the first elongated hole 16o is formed longer in the vertical direction, that is, in the width direction of the second connecting side walls 16c and 16d than the longitudinal direction FR of the vehicle, like the first elongated hole 16g of the first embodiment. Has been. The width D1 at the lower end of the first elongated hole 16o on the flange 16f side is slightly larger than the diameter R1 of the shaft portion 24a of the first fastening bolt 24 and the diameter of the washer 26 of the first fastening bolt 24. The width D1 at the upper end of the first elongated hole 16o on the second upper wall 16e side is larger than the diameter R1 of the shaft portion 24a of the first fastening bolt 24 and the diameter of the washer 26. The width dimension D1 is smaller than R2. The first elongated hole 16o is connected to the lower end on the flange 16f side and the upper end on the second upper wall 16e side in the first elongated hole 16o, and the width dimension D1 of the lower end on the flange 16f side. A connecting hole 16p having a width dimension D1 similar to that of FIG.

  As shown in FIG. 13, the front skeleton structure of the present embodiment is similar to the front skeleton structure 10 of the first embodiment described above in that the first elongated holes 16q drilled in the second connecting side walls 16c and 16d. The shape is different from the shape of the first elongated hole 16g of the first embodiment, and the other is substantially the same as the front skeleton structure 10 of the first embodiment.

  As shown in FIG. 13, the first elongated hole 16q is formed longer in the vertical direction, that is, in the width direction of the second connecting side walls 16c and 16d than the vehicle longitudinal direction FR, like the first elongated hole 16g of the first embodiment. Has been. Further, the width dimension D1 between the lower end portion on the flange portion 16f side and the upper end portion on the second upper wall 16e side in the first elongated hole 16q is slightly larger than the diameter R1 of the shaft portion 24a of the first fastening bolt 24 and The first fastening bolt 24 is set smaller than the diameter R2 of the washer 26 and has the same dimensions.

  As shown in FIG. 14, the front skeleton structure of the present example has a structure in which the first long hole 16q is formed at the intermediate portion in the longitudinal direction of the first long hole 16q as compared with the first long hole 16q of Example 4 described above. It is different in that a movement suppressing portion 16s is provided that divides the upper end portion and the lower end portion to prevent the movement of the shaft portion 24a of the first fastening bolt 24 in the first elongated hole 16q, Others are substantially the same as the first elongated hole 16q of the fourth embodiment.

  In such a front skeleton structure, for example, when a collision load F including a downward direction component having a magnitude greater than or equal to a predetermined value is applied, the movement suppressing portion 16s collides with the shaft portion 24a of the first fastening bolt 24. When the movement suppressing portion 16s is broken, the rear end portion 16b of the radiator support upper side member 16 is relatively displaced downward with respect to the front end portion 12a of the side frame member 12. For this reason, the impact load F can be absorbed also by the movement suppression part 16s being broken.

  As shown in FIG. 15, the front skeleton structure of the present example has a width dimension D1 in the middle portion in the longitudinal direction of the first long hole 16q compared to the first long hole 16q of Example 4 described above. 1 is different from the first elongated hole 16q of the fourth embodiment in that a protrusion 16t protruding from one peripheral edge is provided so as to be smaller than the diameter R1 of the shaft portion 24 of the fastening bolt 24. It is substantially the same.

  In such a front skeleton structure, for example, when a collision load F including a downward direction component of a predetermined size or more is applied, the projection 16t collides with the shaft portion 24a of the first fastening bolt 24. Due to the deformation of the protrusion 16t, the rear end portion 16b of the radiator support upper side member 16 is relatively displaced downward with respect to the front end portion 12a of the side frame member 12. For this reason, the impact load F can be absorbed also when the protrusion 16t is deformed.

  As mentioned above, although one Example of this invention was described based on drawing, this invention is applied also in another aspect.

  For example, in the present embodiment, the first upper wall 12e is formed at the upper ends of the pair of first connecting side walls 12c and 12d at the front end portion 12a of the side frame member 12, but the first upper wall 12e. The rear end portion 16b of the radiator support upper side member 16 is received by the upper ends of the pair of first connecting side walls 12c and 12d, and the rear end portion 16b of the radiator support upper side member 16 is the side frame member. Therefore, the first upper wall 12e is not necessarily formed. Similarly to the above, the third upper wall 14i is necessarily formed at the upper ends of the pair of third connecting side walls 14g and 14h in the radiator support connecting portion 14a, but the third upper wall 14i is not necessarily formed. There is no need.

  Further, in the third to sixth embodiments, the first long holes 16o and 16q having the shapes shown in FIGS. 12 to 15 are formed in the second connecting side wall 16c of the first connecting device 20, but for example, The second long hole 16m of the second connecting device 32 can also be applied to the shape as shown in FIGS.

  Although not illustrated one by one, the present invention can be implemented in variously modified and improved modes based on the knowledge of those skilled in the art.

10, 28: Front skeleton structure (vehicle front skeleton structure)
12: Side frame member 12a: Front end portion 12b: Side wall 12c, 12d: A pair of first connecting side walls 12g: Outer wall surface 14: Radiator support member 14a: Radiator support connecting portion 14f: Side walls 14g, 14h: A pair of third Connection side wall 14k: outer wall surface 16: radiator support upper side member 16a: front end portion 16b: rear end portion 16c, 16d: a pair of second connection side walls 16e: second upper wall 16g: first long hole 16h: inner wall surface 16i, 16j: a pair of fourth connecting side walls 16k: fourth upper wall 16m: second elongated hole 16n: inner wall surface 20: first connecting device 24: first fastening bolt 30: second fastening bolt 32: second connection Device F: Impact load FR: Vehicle longitudinal direction G1, G2: Gap H1, H2: Height LR: Vehicle width direction

Claims (4)

Provided on both sides in the vehicle width direction of the side frame member disposed along the vehicle longitudinal direction from the lower part of the front pillar of the vehicle, a frame-like radiator support member disposed in the vehicle width direction, and the radiator support member A vehicle front skeleton structure comprising a radiator support connecting portion and a radiator support upper side member that connects between the front end portion of the side skeleton member;
The front end portion of the side skeleton member has a pair of first connecting side walls having a height that forms a step that becomes lower than the side wall of the portion adjacent to the rear end side of the front end portion of the side skeleton member. And
The rear end portion of the radiator support upper side member integrally includes a pair of second connecting side walls and a second upper wall connecting the upper end portions of the pair of second connecting side walls, and downward. It has an inverted U-shaped cross section that opens,
In a state where a gap is formed between the upper ends of the pair of first connection side walls and the second upper wall, the outer wall surfaces of the pair of first connection side walls and the inside of the pair of second connection side walls It includes a directional component that generates a surface pressure between the wall surface and fixes the front end portion of the side skeleton member and the rear end portion of the radiator support upper side member to each other and has a predetermined size or more. A vehicle front skeleton structure characterized by including a first coupling device that allows relative displacement of the first coupling side wall downward with respect to the first coupling side wall when an impact load is applied. .   The first coupling device includes a first elongated hole formed in the pair of second coupling side walls longer in the vertical direction than the vehicle front-rear direction, and a screw threaded into the pair of first coupling side walls through the first elongated hole. A pair of first fastening bolts that are combined to generate the surface pressure, and by moving a shaft portion of the first fastening bolt within the first elongated hole, the second coupling bolt is moved relative to the first connection side wall. 2. The vehicle front skeleton structure according to claim 1, which allows a relative displacement downward of the connecting side wall. The radiator support connecting portion protrudes laterally from both sides of the radiator support member in the vehicle width direction and forms a pair of heights that form a step that becomes lower with respect to the side wall of the portion adjacent to the radiator support connecting portion. Having three connecting side walls,
The front end portion of the radiator support upper side member integrally has a pair of fourth connecting side walls and a fourth upper wall connecting the upper ends of the pair of fourth connecting side walls and opens downward. It has an inverted U-shaped cross section,
In a state where a gap is formed between the upper ends of the pair of third connection side walls and the fourth upper wall, the outer wall surface of the pair of third connection side walls and the inside of the pair of fourth connection side walls The front end of the radiator support upper side member and the radiator support connecting portion are connected to each other by generating a surface pressure with the wall surface, and an impact load including a downward direction component of a predetermined size or more is applied. The vehicle front portion according to claim 1, further comprising a second coupling device that allows relative displacement of the third coupling side wall downward with respect to the third coupling side wall. Skeletal structure.   The second connecting device includes a second elongated hole formed in the pair of fourth connecting side walls that is longer in the vertical direction than the horizontal direction, and is screwed into the pair of third connecting side walls through the second elongated hole. And a pair of second fastening bolts for generating the surface pressure, and the fourth connection with respect to the third connection side wall by moving a shaft portion of the second fastening bolt within the second elongated hole. 4. The vehicle front skeleton structure according to claim 3, wherein the relative displacement of the vehicle side wall is allowed downward.

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