JP2013220738A - Vehicle front part structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further improve collision performance even in a full-wrap collision or a narrow-offset collision of a vertical offset by appropriately performing the transmission of an impact force and generating a reaction force thereto both in a front side frame and a lower member without affecting the performance of a coupling structure between the front side frame and the lower member by welding performance.SOLUTION: In a part where a lower member 16 vertically crosses a front side frame 18 in a side view of a vehicle body, a coupling member 40 is provided to penetrate straightly both the front side frame 18 and the lower member 16 in a vehicle width direction, and to be fixed to the front side frame 18 and the lower member 16.

Description

  The present invention relates to a vehicle body front structure of an automobile, and more particularly to a type of vehicle body front structure in which a front side frame and a lower member are connected by a connection structure.

  As the vehicle body front structure of the conventional example 1, the left and right front side frames extending in the longitudinal direction of the vehicle body and the upper end of the vehicle body in the vehicle width direction from the front side frame and connected to the front pillar are connected to the front pillar. 2. Description of the Related Art There are known left and right lower members that extend forward and downward, and a front side frame and a lower member that are connected to each other are connected to each other by a coupling member (for example, Patent Documents 1 and 2).

  The coupling member transmits a collision load input to one of the front side frame and the lower member due to a full wrap collision or an offset collision to the other, and the transmission of the collision load and generation of reaction force are performed by both the front side frame and the lower member. Thus, the collision performance is improved.

  There are various connecting members such as a plate-like member and a groove-shaped cross-sectional shape, and all of them are joined to the front side frame and the outer wall of the lower member by butt welding or fillet welding.

  As the vehicle body front structure of the automobile of the conventional example 2, one end side of a coupling member formed by a round pipe penetrates in the vehicle width direction of the front side frame, and is fillet welded to the front side frame in the penetrating state, and the other end is bent. It is known that the front side frame and the lower member are connected to each other by a coupling member by butt welding or fillet welding to the outer wall of the front upper member (lower member) by the formed brat (for example, Patent Document 3).

Japanese Patent No. 3599327 JP 2010-18082 A Japanese Patent No. 4091499

  In the vehicle body front part structure of the conventional example 1, since the end of the coupling member is joined to the outer wall of the front side frame and the lower member by butt welding or fillet welding, the coupling structure of the front side frame and the lower member by the coupling member The performance (mechanical strength) is affected by the welding performance, and there is a limit to increasing the bonding strength in the tensile direction and shearing direction of the joint portion between the coupling member, the front side frame, and the lower member.

  In the vehicle body front part structure of the conventional example 2, the coupling member and the front side frame are coupled with each other because the coupling member passes through the front side frame. However, since the connection between the coupling member and the lower member is performed by butt welding or fillet welding with respect to the outer wall of the lower member, the tensile strength and shear strength of the coupling portion are determined between the coupling member and the front side frame. Under the influence of the welding performance, there is a limit to increasing the bond strength in the tensile direction and shear direction of the joint portion between the bond member and the lower member.

  For this reason, the collision performance is further improved against the full-wrap collision with the vertical offset of the front bumper beam mounted on the front side frame of the front side frame and the narrow offset collision that collides outward from the front side frame in the vehicle width direction. It is difficult to plan.

  The problem to be solved by the present invention is that the performance of the connection structure between the front side frame and the lower member by the coupling member is not affected by the welding performance, and the transmission of the collision load is also performed in the full lap collision or the narrow offset collision of the vertical offset. In other words, the collision performance is further improved by generating the reaction force accurately in both the front side frame and the lower member.

  The vehicle body front structure according to the present invention includes a left and right front side frame (18) extending in the longitudinal direction of the vehicle body, and a front pillar (10) whose upper end is located outside the front side frame (18) in the vehicle width direction. The left and right lower members (16) that are joined to each other and extend forward and downward from the joint, and the connecting structure that connects the left and right front side frames (18) and the lower members (16) to each other. In the front structure, the lower member (16) extends vertically across the front side frame (18) when viewed from the side of the vehicle body, and the front side frame (18) and the lower member (16 ) Both in a straight line in the vehicle width direction and fixed to the front side frame (18) and the lower member (16). Coupling member (40) is provided which.

  According to this configuration, the coupling member (40) passes through the front side frame (18) and the lower member (16) in the vehicle width direction, so that the front side frame (18) and the lower member (16) are not welded. Are coupled to each other in the tensile direction (bending direction) and the shear direction between the coupling member (40) and the front side frame (18), and the tensile direction between the coupling member (40) and the lower member (16). Bonding in the shear direction is performed with high bond strength without being affected by welding performance.

  In the vehicle body front structure according to the present invention, preferably, the coupling member (40) has a fastener (46, 48, 50, 52) on each of the front side frame (18) and the lower member (16). It is fixed by.

  According to this configuration, the coupling member (40), the front side frame (18), and the lower member (16) are fixed in the vehicle width direction by the fasteners (46, 48, 50, 52), respectively. The fixing in the vehicle width direction is not affected by the welding performance, and there is no individual difference in the fixing strength.

  In the vehicle body front structure according to the present invention, preferably, the lower member (16) is fitted to the upper member (16U) whose upper end is joined to the front pillar (10) and the tip of the upper member (16U). The lower member (16L) is fitted so as to be adjustable in length, and the lower member (16) is formed with a through portion and a fixing portion of the coupling member (40).

  According to this configuration, even when the coupling member (40) passes through both the front side frame (18) and the lower member (16) in a straight line in the vehicle width direction, the lower member (16L) with respect to the upper member (16U). By adjusting the fitting length, the coupling member (40) can be properly attached in a centered state regardless of assembly errors or component errors of the front side frame (18) and the lower member (16).

  In the front body structure of an automobile according to the present invention, preferably, the front side frame (18) and the lower member (16) each have a box-shaped cross-sectional shape, and an inner side wall and a vehicle width direction. Through holes (34, 38) penetrating in a straight line in the vehicle width direction are formed in the outer side wall, and the coupling member (40) is penetrated by the front side frame (18) and the lower member (16). A pipe part (42) inserted into the holes (34, 36) and a flange part (44) provided at one end of the pipe part (42) and joined to the side wall in the vehicle width direction of the front side frame (18). ) And a first bolt (48) penetrating the flange portion (44) and the side wall of the front side frame (18) in the vehicle width direction. 8), and the pipe member (42) passes through the lower member (16) in the vehicle width direction, and the second bolt (52) passes through the lower member (16) in the longitudinal direction of the vehicle body. 16).

  According to this configuration, the coupling member (40) and the front side frame (18) and the lower member (16) are fixed in the vehicle width direction by the first bolt (48) and the second bolt (52), respectively. Therefore, the fixing in the vehicle width direction is not affected by the welding performance, and there is no individual difference in the fixing strength.

  The vehicle body front structure according to the present invention is preferably further in contact with the side wall in the vehicle width direction and the side wall in the vehicle width direction outside at both ends in the front side frame (18), A first internal collar (62) through which the pipe portion (42) passes is provided.

  According to this configuration, the strength of the front side frame (18) in the portion through which the pipe portion (42) passes is increased by the first internal collar (62), and the pipe portion (42) and the front side frame (18) are separated. The bond relationship becomes stronger.

  The vehicle body front structure of an automobile according to the present invention is preferably further provided in the pipe portion (42), extending radially in the pipe portion (42) and contacting the inner wall of the pipe portion at both ends, A second internal collar (66) is provided through which the second bolt (52) passes.

  According to this configuration, the strength of the pipe portion (42) through which the pipe fixing bolt (52) penetrates is increased by the pipe internal collar (66), and the coupling relationship between the pipe portion (42) and the lower member (16) is increased. Become stronger

  In the vehicle body front structure according to the present invention, preferably, the front side frame (18) has a box-shaped cross-sectional shape, and is rearward of the vehicle body front side and rear side of the vehicle body at the rear of the fixed portion of the coupling member (40). An inclined portion (18A) that is inclined inward in the vehicle width direction as it goes is provided with an offset portion (18B), and is coupled to the inner side wall in the vehicle width direction and the outer side wall in the vehicle width direction inside the inclined portion (18A). The internal stiffener (60) extending in the longitudinal direction of the vehicle body is welded.

  According to this configuration, even if the front side frame (18) has a bent shape having the offset portion (18B), a collision load is generated between the inner side wall (60) and the inner side wall (60). ) Is transmitted linearly to the rear of the vehicle body.

  According to the vehicle body front structure of the present invention, the coupling member is coupled to the front side frame and the lower member without welding by passing through the front side frame and the lower member in the vehicle width direction. The connection in the tensile direction (bending direction) and the shear direction between the coupling member and the front side frame and the coupling in the tensile direction and the shear direction between the coupling member and the lower member are performed with high bonding strength without being affected by the welding performance. Will come to be.

The perspective view of the vehicle body front part which shows one Embodiment of the vehicle body front part structure of the motor vehicle by this invention. The perspective view of the principal part of the vehicle body front part structure by this embodiment. FIG. 3 is a plan sectional view of the main part of the vehicle body front structure according to the present embodiment (corresponding to the III-III section in FIG. 2). The perspective view which shows the load input state at the time of the various collision in the vehicle body front part structure by this embodiment. The plane sectional view (equivalent to the III-III section of Drawing 2) showing the important section of other embodiments of the body front part structure of the car by the present invention. The top view which shows the transmission path | route of the collision load at the time. The perspective view which shows the principal part of other embodiment of the vehicle body front part structure of the motor vehicle by this invention. The partial cross-section plan view which shows the principal part of other embodiment of the vehicle body front part structure of the motor vehicle by this invention.

  Embodiments of a vehicle body front structure according to the present invention will be described below with reference to FIGS. The vehicle body front part structure is generally bilaterally symmetric, and other vehicle body structural members excluding the cross member and the like exist in a pair of left and right unless otherwise specified. Each component is made of a metal material such as a steel material having a required strength. The components are joined by welding unless otherwise specified.

  As shown in FIG. 1, the front part of the vehicle body includes left and right front pillar parts 10, and right and left roof side rail parts 12 that are joined to the upper ends of the front pillar parts 10 and extend in the longitudinal direction of the car body. The left and right side sill portions 14 joined to the lower end of the front pillar portion 10 and extending in the longitudinal direction of the vehicle body, and the left and right side sill portions 14 joined to the upper and lower intermediate portions of the front pillar portion 10 It has a lower member 16 and left and right front side frames 18 extending in the longitudinal direction of the vehicle body. These are all configured in a box-shaped closed cross-sectional shape.

  The left and right roof side rail portions 12 are joined to the left and right end portions of the front roof member 20 extending in the vehicle width direction. The left and right end portions of the dashboard upper member 22 extending in the vehicle width direction are joined to the upper and lower intermediate portions of the left and right front pillar portions 10. The front roof member 20, the left and right roof side rail portions 12, and the dashboard upper member 22 define a front window opening.

  The front side frame 18 is a lower body member, and is dive under the dashboard lower member 24 provided at the lower part of the dashboard upper member 22, and the rear end is joined to the front ends of left and right floor frames (not shown). Left and right bumper beam extension members 26 are attached to the front end. Left and right end portions of a bumper beam 28 extending in the vehicle width direction are joined to the left and right bumper beam extension members 26.

  The bumper beam extension member 26 is a crash member at the time of a frontal collision, has a lower rigidity and lower strength than the front side frame 18 and the bumper beam 28, and compresses and deforms (crushes) when receiving a frontal collision load exceeding a predetermined value. is there.

  The lower member 16 is located outside the front side frame 18 in the vehicle width direction and forms a skeleton of a front tie house or a side fender. The lower member 16 may be constituted by a joined body that is joined to the front pillar portion 10 and a member that extends forward and downward from the vehicle body. The former is sometimes called an upper member and the latter is called a lower member. However, in this specification, the whole is collectively referred to as a lower member. The left and right front damper housings 30 are joined to the inner side of the lower member 16 in the vehicle width direction.

  The lower member 16 extends vertically across the vicinity of the front end of the front side frame 18 when viewed from the side of the vehicle body. As a result, the lower end (tip) of the lower member 16 is positioned below the arrangement position on the front end side of the front side frame 18. The left and right ends of the front bulkhead lower cross member 32 extending in the vehicle width direction are joined to the lower ends of the left and right lower members 16.

  The principal part of the vehicle body front structure according to the present embodiment will be described with reference to FIGS.

  The lower member 16 and the front side frame 18 are each a substantially U-shaped channel member (groove-shaped cross section) channel members 16A and 18A, and flat plates joined to the channel members 16A and 18A so as to close the groove openings of the channel members 16A and 18A. The plate-shaped plate members 16B and 18B form a box-shaped cross-sectional shape (closed cross-sectional shape).

  The plate member 16B of the lower member 16 is on the inner side in the vehicle width direction, the plate member 18B of the front side frame 18 is on the outer side in the vehicle width direction, and the lower member 16 crosses the front side frame 18 up and down as viewed from the side of the vehicle body. These plate members 16B and 18B form side portions (side walls) that face each other in parallel with a predetermined interval in the vehicle width direction.

  A through hole 34 is formed in a portion where the front side frame 18 crosses the lower member 16. A through hole 36 is formed in a portion where the lower member 16 crosses the front side frame 18. The through hole 34 is formed through the bottom of the channel member 18A of the front side frame 18, that is, the side wall on the inner side in the vehicle width direction of the front side frame 18, and the plate member 18B, that is, the side wall on the outer side in the vehicle width direction of the front side frame 18. Has been. The through hole 36 is formed through the bottom of the channel member 16 </ b> A of the lower member 16, the side wall on the outer side in the vehicle width direction of the lower member 16, and the side wall on the inner side in the vehicle width direction of the plate member 16 </ b> B. These through holes 34 and 36 are all in a straight line in the vehicle width direction. The through holes 34 and 36 are round holes for bolt through holes. It is preferable that a rising portion 38 is formed at the peripheral edge of each of the through holes 34 and 36 by burning to reinforce the hole.

  One coupling member 40 is inserted into the through holes 34 and 36. The coupling member 40 is inserted into all of the through holes 34 and 36 and passes through both the front side frame 18 and the lower member 16 in a straight line in the vehicle width direction, and the vehicle width direction of the pipe portion 42. A flange portion 44 integrally formed by a spatula drawing process or the like is provided at an inner end portion.

  The flange portion 44 is joined to the inner side wall in the vehicle width direction of the front side frame 18, that is, the bottom outer surface of the channel member 18A. Bolt through holes 44A and 18C are formed through the flange portion 44 and the channel member 18A in the vehicle width direction. A nut 46 is welded at a position aligned with the bolt through hole 18C on the inner surface of the bottom of the channel member 18A.

  A flange fixing bolt (first bolt) 48 is inserted into the bolt through holes 44A and 18C. The flange fixing bolt 48 is screwed into the nut 46. The flange portion 44 is fixed to the front side frame 18 by fastening the flange fixing bolt 48. In the illustrated embodiment, the flange fixing bolts 48 are provided at two places before and after the pipe portion 42 is sandwiched. However, even if the flange fixing bolts 48 are provided at two places above and below the pipe portion 42, they are provided at both of them. Also good.

  Bolt through holes 16C, 16D, and 42A are formed in the vehicle front-rear direction at portions where the front and rear walls of the channel member 16A of the lower member 16 and the pipe portion 42 penetrate the lower member 16 in the vehicle width direction. ing. A nut 50 is welded at a position aligned with the bolt through hole 16D on the outer surface of the rear wall of the channel member 16A. Pipe fixing bolts (second bolts) 52 are inserted into the bolt through holes 16C, 16D, and 42A. The pipe fixing bolt 52 is screwed into the nut 50. The pipe portion 42 is fixed to the lower member 16 by fastening the pipe fixing bolt 52. In the illustrated embodiment, the pipe fixing bolts 52 are provided in two axial directions of the pipe portion 42, but the number of the pipe fixing bolts 52 is not limited to two.

  In this way, the coupling member 40 penetrates both the front side frame 18 and the lower member 16 in a straight line in the vehicle width direction and rigidly connects the front side frame 18 and the lower member 16 to each other.

  According to the connection structure described above, the coupling member 40 is coupled to the front side frame 18 and the lower member 16 without welding by passing through the front side frame 18 and the lower member 16 in the vehicle width direction. Thereby, the connection in the tensile direction (bending direction) and the shear direction between the coupling member 40 and the front side frame 18 and the coupling in the tensile direction and the shear direction between the coupling member 40 and the lower member 16 are affected by the welding performance. Without, that is, with high bond strength without causing individual differences.

  Thereby, the transmission of the collision load between the front side frame 18 and the lower member 16 by the coupling member 40 is performed satisfactorily, and the transmission of the collision load to the rear of the vehicle body and the reaction force can be achieved even in a full-lap collision or a narrow offset collision of the vertical offset. Generation occurs accurately in both the front side frame 18 and the lower member 16. This improves the front collision performance.

  As shown in FIG. 4, when the collision load F1 is input to the bumper beam 28 due to a collision with a counterpart vehicle having the same height as the own vehicle, the bumper beam extension member 26 is crushed and the front side frame 18 is collapsed. The collision load input to the front end of the vehicle is retracted rearward of the vehicle body while deforming the front side frame 18. At this time, since the connecting member 40 penetrates the front side frame 18 and the lower member 16 in the vehicle width direction and is not connected by welding, the connecting member 40 is not peeled off from the front side frame 18 or the lower member 16, In accordance with the deformation of the side frame 18, the lower member 16 follows the connecting member 40 using the connecting member 40 as a load transmission path while receiving a tensile load (bending load). Accordingly, a sufficient reaction force can be generated as a whole by the both members of the front side frame 18 and the lower member 16 against the collision load F1.

  Further, as shown in FIG. 4, when a collision load F <b> 2 is input to the lower member 16 due to a collision with an opponent vehicle having a bumper beam whose ground clearance is higher than that of the own vehicle, a tensile load (bending load) is applied to the coupling member 40. Works. At this time, since the coupling member 40 penetrates the front side frame 18 and the lower member 16 in the vehicle width direction and is not coupled by welding, the coupling member 40 does not peel off from the front side frame 18 or the lower member 16. The connected state of the front side frame 18 and the lower member 16 is maintained, and the front side frame 18 follows the deformation of the lower member 16. Accordingly, a sufficient reaction force can be generated as a whole against both the collision load F <b> 2 by both the front side frame 18 and the lower member 16. This operation is the same when a narrow offset collision occurs.

  Further, as shown in FIG. 4, when the connecting portion between the front side frame 18 and the lower member 16 by the connecting member 40 of the own vehicle collides with a pole on the road or the like, the collision load F3 is input to the connecting portion. . At this time, since the coupling member 40 penetrates the front side frame 18 and the lower member 16 in the vehicle width direction and is not coupled by welding, the coupling member 40 does not peel off from the front side frame 18 or the lower member 16. The front side frame 18 and the lower member 16 follow the deformation of the coupling member 40. As a result, a sufficient reaction force can be generated as a whole against both the collision load F3 and the front side frame 18 and the lower member 16. This operation is the same when a narrow offset collision occurs.

  In the present embodiment, the coupling member 40, the front side frame 18 and the lower member 16 are fixed in the vehicle width direction by bolt fastening with a flange fixing bolt 48, a pipe fixing bolt 52 and nuts 46, 50, respectively. Therefore, the fixing in the vehicle width direction is not affected by the welding performance, and there is no individual difference in the fixing strength.

  Since the through holes 34 and 36 through which the pipe portion 42 penetrates are formed in the front side frame 18, this portion becomes a break point of the front side frame 18 at the time of a frontal collision. The portion where the through holes 34 and 36 are formed serves as a break point of the front side frame 18, but since the front side frame 18 is firmly coupled to the lower member 16 by the coupling member 40, this coupling relationship is broken. Therefore, both the front side frame 18 and the lower member 16 can be effectively operated as energy absorbing members.

  Another embodiment of a vehicle body front structure according to the present invention will be described with reference to FIG. 5, parts corresponding to those in FIG. 3 are denoted by the same reference numerals as those in FIG. 3, and description thereof is omitted.

  In this embodiment, a frame internal collar (first internal collar) 62 is provided in the front side frame 18 where the pipe portion 42 penetrates. The inner collar 62 for the frame is formed of a cylindrical body having a flange portion 62A at one end, and both ends thereof are in contact with the side wall on the inner side in the vehicle width direction (bottom portion of the channel member 18A) and the side wall on the outer side in the vehicle width direction (plate member 18B). The pipe part 42 penetrates the inside in the vehicle width direction. The flange portion 62A is overlapped inside the bottom portion of the channel member 18A, and a bolt through hole 62B is formed through the flange portion 62A and a nut 46 is welded. In this case, the frame fixing bolt 48 is inserted into the three bolt through holes 44A, 18C, 62B and screwed into the nut 46. The frame internal collar 62 may be fixed to the channel member 18A or the plate member 18B by welding or the like.

  By providing the inner collar 62 for the frame, the strength of the front side frame 18 through which the pipe portion 42 penetrates increases, and the coupling relationship between the pipe portion 42 and the front side frame 18 becomes stronger. Further, since the frame internal collar 62 is provided, the pipe portion 42 can be easily inserted into the front side frame 18.

  In this embodiment, the pipe internal collar 66 is provided in the pipe portion 42 where the pipe fixing bolt 52 passes. The pipe internal collar 66 is formed of a cylindrical body, extends in the pipe portion 42 in the radial direction (vehicle body longitudinal direction), contacts the inner wall of the pipe portion 42 at both ends, and the pipe fixing bolt 52 penetrates the inside. doing. The pipe inner collar 66 may be fixed in the pipe portion 42 by welding or the like.

  By providing the pipe internal collar 66, the strength (compression resistance) of the pipe portion 42 through which the pipe fixing bolt 52 penetrates increases, and the coupling strength between the pipe portion 42 and the lower member 16 becomes stronger. Become. Further, the provision of the pipe internal collar 66 facilitates the insertion of the pipe fixing bolt 52 into the pipe portion 42.

  Further, an inner collar 64 for the lower member is provided in the lower member 16 where the pipe fixing bolt 52 passes. The pipe inner collar 64 is formed of a cylindrical body, extends in the front-rear direction of the vehicle body in the lower member 16, and at both ends, the front inner wall of the lower member 16, the front outer wall of the pipe portion 42, and the rear inner wall of the lower member 16 and the pipe. A pipe fixing bolt 52 penetrates the inside of the portion 42 in contact with the rear outer wall. The pipe fixing bolt 52 may be fixed to the lower member 16 by welding or the like.

  By providing the pipe internal collar 64, the strength (compression resistance) of the lower member 16 in the portion through which the pipe fixing bolt 52 passes is increased, and the coupling strength between the pipe portion 42 and the lower member 16 becomes stronger. . Further, since the pipe inner collar 64 is provided, the pipe fixing bolt 52 can be easily inserted into the lower member 16.

  Another embodiment of a vehicle body front structure according to the present invention will be described with reference to FIG. 5, parts corresponding to those in FIG. 2 are denoted by the same reference numerals as those in FIG. 2, and description thereof is omitted.

  In this embodiment, the lower member 16 is formed in a box-shaped cross section by a channel member 16A and a plate member 16B, and an upper member 16U having an upper end joined to the front pillar 10 (see FIG. 1) and a square by extrusion or the like. The lower member 16L is formed in a hollow shape and is fitted to the opening of the upper end of the upper member 16 so that the fitting length can be adjusted. The upper member 16U and the lower member 16L are integrated by welding. A through hole 36 through which the coupling member 40 passes is formed in the lower member 16L, and the coupling member 40 is penetrated and fixed to the lower member 16L. That is, the penetration member and the fixing portion of the coupling member 40 are formed in the lower member 16L.

  According to this embodiment, before the upper member 16U and the lower member 16L are welded, the through hole 34 of the front side frame 18 and the lower member 16L are adjusted by adjusting the fitting length of the lower member 16L with respect to the upper member 16. The coupling member 40 is inserted into the through-hole 34 of the front side frame 18 and the through-hole 36 of the lower member 16L while aligning with the through-hole 36, and the coupling member 40 is inserted into the front side frame 18 and the lower member 16L. The upper member 16U and the lower member 16L are welded after being fixed by bolt fastening.

  Thereby, even if there is an assembly error or part size error of the front side frame 18 or the upper member 16U, the through hole 34 of the front side frame 18 and the through hole 36 of the lower member 16L are aligned in the vehicle width direction. The coupling member 40 can be passed through both the front side frame 18 and the upper member 16U without causing the coupling member 40 to be twisted.

  Another embodiment of a vehicle body front structure according to the present invention will be described with reference to FIG. 7, parts corresponding to those in FIGS. 1 to 3 are denoted by the same reference numerals as those in FIGS. 1 to 3, and description thereof is omitted.

  In this embodiment, the front side frame 18 having a box-shaped cross section has a rear side from the front side of the vehicle body at the rear of the vehicle body relative to the fixing portion of the coupling member 40 in order to secure a space for arranging the horizontal engine and a space for the front tire. An offset portion 18B is formed by an inclined portion 18A that is inclined inward in the vehicle width direction toward the vehicle.

  Inside the inclined portion 18A and in the vicinity of the front and rear thereof, an internal stiffener 60 is provided that is welded to the side wall in the vehicle width direction and the side wall in the vehicle width direction and extends in the vehicle body front and rear direction.

  By providing the internal stiffener 60, even if the front side frame 18 is bent, a collision load is linearly transmitted to the rear of the vehicle body between the inner side wall and the outer side wall. Become so. As a result, even if the front side frame 18 is offset from the vehicle width direction outer side to the vehicle width direction inner side in the vehicle width direction from the vehicle body front side to the vehicle body rear side, the transmission and distribution of the collision load to the vehicle body rear side are performed well, and the collision performance is improved. improves.

  Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to such embodiments so that those skilled in the art can easily understand, and departs from the spirit of the present invention. It is possible to change appropriately within the range not to be. The fixing of the coupling member 40 to the front side frame 18 and the lower member 16 may be performed not only by bolt fastening but also by other fasteners such as clips or by welding. The flange portion 44 of the coupling member 40 may be provided by welding separately from the plastic portion integrated with the pipe portion 42. The pipe portion 42 is not limited to a cylindrical body, and may be a polygonal cylindrical body.

  In addition, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Front pillar part 16 Lower member 18 Front side frame 26 Bumper beam extension member 28 Bumper beam 30 Front damper housing 34 Through hole 36 Through hole 40 Connection member 42 Pipe part 44 Flange part 46 Nut 48 Flange fixing bolt 50 Nut 52 Pipe fixing bolt 60 Inside Stiffna

Claims (7)

Left and right front side frames extending in the front-rear direction of the vehicle body, left and right lower members extending from the front side frame to the front pillar with the upper end being joined to the front pillar, A vehicle body front structure including a connection structure that connects the front side frame and the lower member between each other,
The lower member extends vertically across the front side frame as viewed from the side of the vehicle body,
A vehicle body front structure provided with a coupling member that passes through both the front side frame and the lower member in a straight line in the vehicle width direction and is fixed to the front side frame and the lower member at the crossing portion.   The vehicle body front part structure according to claim 1, wherein the coupling member is fixed to each of the front side frame and the lower member by a fastener.   The lower member includes an upper member whose upper end is joined to the front pillar, and a lower member that is fitted to the tip of the upper member so that the fitting length can be adjusted. The vehicle body front part structure according to claim 1 or 2, wherein a fixed part is formed. Each of the front side frame and the lower member has a box-shaped cross-sectional shape, and a through hole is formed in the vehicle width direction inner side wall and the vehicle width direction outer side wall so as to pass through in a straight line in the vehicle width direction. And
The coupling member includes a pipe portion that is inserted into a through-hole of the front side frame and the lower member, and a flange portion that is provided at one end of the pipe portion and is joined to a side wall in the vehicle width direction of the front side frame. A portion that is fixed to the front side frame by a first bolt that penetrates the flange portion and the side wall of the front side frame in the vehicle width direction, and the pipe portion penetrates the lower member in the vehicle width direction; The vehicle body front part structure according to any one of claims 1 to 3, wherein the vehicle body front part structure is fixed to the lower member by a second bolt that penetrates the lower member in the longitudinal direction of the vehicle body.   5. A first internal collar that is in the front side frame and is in contact with the side wall on the inner side in the vehicle width direction and the side wall on the outer side in the vehicle width direction at both ends and through which the pipe portion passes. Vehicle body front structure described in 2.   A second internal collar is provided in the pipe portion, extending in the radial direction in the pipe portion, contacting the inner wall of the pipe portion at both ends, and penetrating the second bolt. Vehicle body front structure as described.   The front side frame has a box-shaped cross section, and has an offset portion by an inclined portion inclined inward in the vehicle width direction toward the rear side from the front side of the vehicle body behind the fixed portion of the coupling member. 7. The internal stiffener that extends in the longitudinal direction of the vehicle body and is connected to the inner side wall in the vehicle width direction and the outer side wall in the vehicle width direction is provided inside the inclined portion. Body front structure.

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