JP2009227120A - Vehicle body front part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body front part structure capable of securing expected collision energy absorption due to crushing deformation of a front main frame at a collision time with a simple constitution. <P>SOLUTION: This vehicle body front part structure 1 includes the front main frame 10 provided with a front part 11, a kickup part 12 and an extension part 13, and a sub frame 20 in which a front end part 21a and a rear end part 22 are fastened and fixed to the front part 11 and the kickup part 12. The sub frame 20 is bent and deformed downward according to the crushing deformation of the front main frame 10 in the head-on collision. In the structure 1, a fastening bolt 40 having a distal end part 41 projecting into the kickup part 12 is fixed to the rear end part 22, and the kickup part 12 includes an interference member 37 opposed to the distal end part 41 of the fastening bolt 40. The distal end part 41 of the fastening bolt 40 abuts on the interference member 37 according to bending deformation of the sub frame 20 to prevent rising deformation of the kickup part 12 and to stably absorb collision energy of the front main frame 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body front structure of an automobile, and more particularly to a front main frame that extends in the front-rear direction on both sides in the vehicle width direction and a vehicle body front structure in which a subframe is disposed below the front main frame.

  A vehicle body front structure is known in which a sub-frame for supporting a power unit including an engine and a transmission is arranged below a pair of front main frames extending in the front-rear direction on both sides in the vehicle body width direction.

  For example, Patent Document 1 discloses a vehicle body front part structure in which a subframe is disposed below the front main frame. An outline of the vehicle body front part structure disclosed in Patent Document 1 will be described with reference to FIGS.

  FIG. 7 is a side view showing an arrangement state of the front main frame and the sub frame at the front portion of the vehicle body. As shown in FIG. 7, the front main frame 102 has a straight front portion 102A extending in the front-rear direction, a kick-up portion 102B inclined downward from the rear end of the front portion 102A, and a rear end of the kick-up portion 102B. An extension portion 102C extending rearward is continuously formed. The kick-up portion 102B extends along the front surface of the toe board 101A of the dash panel 101 that divides the passenger compartment R and the engine room E, and the extension portion 102C is joined to the lower surface of the floor panel 102B continuous to the rear of the toe board 101A. . A bumper 108 is supported at the front end of the front main frame 102 via a bumper stay 107.

  The sub-frame 103 extending below the front main frame 102 has a side frame 103A extending in the front-rear direction, and its front end 103Aa is disposed on the lower surface of the front end of the front portion 102A of the front main frame 102. The bracket 104 is fastened and fixed to the lower surface of the bracket 104 by a bolt 105, and the rear end portion 103Ab is fastened and fixed to the lower surface of the extension portion 102C by a bolt 106.

  The power unit P / U including the engine and the transmission is supported via a mount member (not shown) so as to be separated when the front portion 102A is crushed in the axial direction across the front portions 102A of the pair of front main frames 102. At the same time, the lower part is supported by the middle part in the front-rear direction of the side frame 103A via the mount member 109.

  In such a vehicle body front structure, when a collision load F is input to the front end of the front main frame 102 due to a frontal collision of the vehicle, the bumper stay 107 is deformed in the axial direction as shown in FIGS. The front portion 102A of the front main frame 102 is crushed and deformed in the axial direction from the front end side.

  With the progress of the crushing deformation on the front end side of the front portion 102A, the power unit P / U is detached at the mounting portion of the front portion 102A, while the side frame 103A of the subframe 103 is fastened with the front end portion 103Aa and the rear end portion 103Ab. A compressive load Fa in the front-rear direction is generated with the fixed portion as a fulcrum, and the side frame 103A is bent and deformed downward in a V shape with the support point of the power unit P / U by the mount member 109 as a vertex.

  The collision energy is absorbed by the crushing deformation of the front main member 102 and the bending deformation of the sub frame 103, and the power unit P / U is guided downward to suppress the deformation of the dash panel 101.

JP-A-2005-219609

  However, since the front portion 102A and the extension portion 102C of the front main frame 102 are offset through the inclined kick-up portion 102B, the front main frame 102 is bent by the collision load F input from the front to the front portion 102A during a frontal collision. The continuous portion of the kick-up portion 102B and the extension portion 102C that has been bent is bent and deformed so that the kick-up portion 102B rises upward, and the front portion 102A swings greatly upward as the kick-up portion 102B rises and deforms. is there. When the front portion 102A swings upward, the coaxiality between the input direction of the collision load F and the axial direction of the front portion 102A is lost, and the efficient crushing deformation of the front portion 102A due to the collision load F is prevented. There is a concern that the expected collision energy absorption due to the crushing deformation of the portion 102A cannot be achieved. In addition, a large shearing load acts on the bolt 106 that fastens the rear end portion 103Ab of the subframe 103 and the front main frame 102, and the bolt 106 breaks and the rear end portion 103Ab of the subframe 103 and the front main frame 102 are separated. When the fastening is released, there is a concern that the expected collision energy absorption due to the bending of the subframe 103 cannot be achieved.

  On the other hand, in order to prevent bending deformation of the continuous portion between the kick-up portion 102B and the extension portion 102C, there is a concern that the structure becomes complicated and the weight of the front main frame 102 increases when the portion is stiffened.

  Accordingly, an object of the present invention made in view of the above points is to provide a vehicle body front structure that can ensure the expected collision energy absorption due to the crushing deformation of the front main frame at the time of collision with a simple configuration without increasing the weight. There is.

  The invention of the vehicle body front structure according to claim 1, which achieves the above object, includes a front portion disposed in both sides of the vehicle body in the vehicle width direction and extending straight in the front-rear direction, and a rear end of the front portion. A front main frame having a hollow cross section with a kick-up portion inclined downward and an extension portion extending rearward from the rear end of the kick-up portion, and extending in the front-rear direction below the front main frame A subframe having a front end portion fastened and fixed to the front portion and a rear end portion fastened and fixed to the kick-up portion is provided. And a vehicle body front structure in which a central portion is bent and deformed downward in a V shape with each fastening fixing portion at the rear end portion as a fulcrum, and the front end portion is fixed to the rear end portion of the subframe and the front end portion is the kick A fastening bolt that protrudes into the pop-up portion, and an interference member that is provided in the kick-up portion and that faces the front surface of the front end portion of the fastening bolt. The tip of the fastening bolt is in contact with the interference part.

  According to the present invention, as the front main frame is crushed and deformed due to a frontal collision of the vehicle, the subframe starts a downward bending deformation in a V shape with the fastening and fixing portions at the front end portion and the rear end portion as fulcrums. The front end of the fastening bolt fixed to the rear end of the subframe is in contact with the interference member and presses the interference member forward to suppress the rearward movement of the kickup portion; Suppresses bending deformation of the continuous part with the extension part. This prevents the kick-up portion from rising upward and prevents the front portion from swinging upward, maintaining the coaxiality between the collision load input direction and the front portion axial direction, and stabilizing the front main frame. An axial crushing deformation is obtained, and efficient collision energy absorption can be achieved.

  Further, it is necessary to stiffen the front main frame with a simple configuration in which the front end portion of the fastening bolt fixed to the rear end portion of the subframe protrudes into the kickup portion and the interference member is disposed in the kickup portion. Therefore, an increase in the size and weight of the front main frame can be avoided.

  According to a second aspect of the present invention, in the vehicle body front portion structure according to the first aspect, the rear end portion of the sub-frame and the kick-up portion are fastened by the fastening bolt.

  According to the present invention, in addition to claim 1, when the subframe is V-shaped with the fastening portions of the front end portion and the rear end portion as fulcrums and downward bending deformation starts, Along with the swing, the kick-up part is urged downward via the fastening bolt, and the rise-up deformation of the kick-up part is more reliably prevented and the front main frame does not swing and the front main frame is stably crushed in the axial direction. A deformation is obtained and more efficient collision energy absorption can be achieved.

  According to a third aspect of the present invention, in the vehicle body front portion structure according to the first aspect, the attachment member is fastened to the sub-frame by the fastening bolt.

  According to this invention, the fastening bolt that fastens the attachment member to the sub-frame has the function of the fastening bolt of claim 1 and simplifies the configuration.

  According to a fourth aspect of the present invention, in the vehicle body front portion structure according to any one of the first to third aspects, the tubular body is fixed to a rear end portion of the subframe, and the fastening is performed on the tubular tube. The bolt is fitted and fixed.

  According to the present invention, the fastening tube can be firmly fixed to the rear end portion of the subframe by fixing the tube tube to the rear end portion of the subframe and fitting and fixing the fastening bolt to the tube tube.

  According to a fifth aspect of the present invention, in the vehicle body front part structure according to any one of the first to fourth aspects, a tip that can contact the kick-up portion protrudes from a rear end portion of the subframe. Features.

  According to the present invention, since the tip end that can contact the kick-up portion is provided at the rear end portion of the subframe, the rear end portion swings downward more reliably with the tip contacting the kick-up portion as a fulcrum. Therefore, the kick-up part can be prevented from getting up and deforming. Further, the backward movement of the subframe is restricted, and the shear load acting on the fastening bolt is reduced.

  According to the present invention, when the sub-frame starts to be bent downward in a V shape with the fastening and fixing portions at the front end portion and the rear end portion as fulcrums due to the progress of the crushing deformation of the front main frame due to the frontal collision of the vehicle, The front end portion of the fastening bolt fixed to the rear end of the frame abuts against the interference member to prevent the kick-up portion from rising and preventing the front main frame from swinging. Directional crushing deformation is obtained, and efficient collision energy absorption can be achieved.

  Embodiments of a vehicle body front structure according to the present invention will be described below with reference to the drawings.

(First embodiment)
1 to 5 show a first embodiment of the present invention, FIG. 1 is a side view showing an arrangement state of a front main frame and a sub frame, FIG. 2 is an enlarged perspective view of a portion A in FIG. FIG. 4 is an enlarged view of a portion A in FIG. 1, FIG. 4 is a side view showing an arrangement state of the front main frame and the sub frame after deformation, and FIG. 5 is an enlarged sectional view of a portion B in FIG.

  As shown in FIG. 1, a front main frame 10, which is a main energy absorbing member at the time of a frontal collision of a vehicle, extends in the longitudinal direction of the vehicle body. The subframe 20 is disposed below the front main frame 10 and supports the power unit P / U including an engine and a transmission.

  As shown in FIG. 1, the front main frame 10 includes a front part 11 that extends straight in the longitudinal direction of the vehicle body, a kick-up part 12 that bends and extends obliquely downward from the rear end of the front part 11, An extension portion 13 that is bent and extends rearward from the rear end of the kick-up portion 12 is continuously formed. A bumper 18 is supported at the front end of the front main frame 10 via a bumper stay 15.

  As shown in FIGS. 2 and 3, the front portion 11 of the front main frame 10 extends in the longitudinal direction of the vehicle body in a rectangular hollow cross-sectional shape having a lower surface 11A, opposing side surfaces 11B and 11C, and an upper surface 11D. The kick-up portion 12 has a lower surface 11A continuous with the lower surface 11A of the front portion 11 and the side surfaces 11B and 11C, and has a U-shaped cross section with the upper side open and extends obliquely downward from the rear end of the front portion 11. The flanges 12Ba and 12Ca that are coupled to the front surface of the toe board of the dash panel (not shown) are bent at the upper edges of the side surfaces 12B and 12C, respectively. Similarly, the extension portion 13 has a lower surface 12A continuous with the lower end 12A of the kick-up portion 12 and the rear ends of the side surfaces 12B and 12C, and side surfaces 13B and 13C. The flanges 13Ba and 13Ca that extend and are joined to the lower edges of the floor panels are bent at the upper edges of the side surfaces 13B and 13C, respectively.

  The kick-up portion 12, the toe board, the extension portion 13, and the floor panel form a rectangular hollow cross-sectional shape that continues along the front surface of the toe board and the lower surface of the floor panel.

  The sub-frame 20 extending below the front main frame 10 includes a side frame 21 having a hollow cross-sectional shape that has a lower surface portion 23 and an upper surface portion 24 and extends in the front-rear direction. The lower end of the bracket 16 disposed on the lower surface of the front end portion of the front portion 11 of the main frame 10 is fastened and fixed by bolts 17, and the rear end portion 22 is fastened and fixed near the rear end of the kick-up portion 12.

  A fastening and fixing portion 30 that fastens and fixes the kick-up portion 12 of the front main frame 10 and the rear end portion 22 of the side frame 21 with fastening bolts 40 will be described with reference to FIGS.

  The rear end portion 22 of the side frame 21 has a front end 22a protruding rearward, and through-holes 23a and 24a penetrating vertically in the lower surface portion 23 and the upper surface portion 24 are opened.

  Cylindrical tubes 31 are inserted into the through holes 23a and 24b of the side frames 21, and are coupled to the tube 31, the lower surface portion 23 and the upper surface portion 24 of the side frames 21 by welding or the like. As a result, the tube 31 having a secured rigidity is firmly fixed to the rear end portion 22 of the side frame 21.

  On the other hand, the rear end is connected to the lower surface 13A of the extension portion 13 of the front main frame 10 by a bolt (not shown) and extends forward, to the front end portion of the plate-like connecting member 25, and to the rear end portion 22 of the side frame 21. A through hole 25a is opened corresponding to the through holes 23a and 24a to be opened.

  Further, a bolt insertion hole 32 is opened on the lower surface 12 </ b> A of the kick-up portion 12 corresponding to the tube 31 arranged in the subframe 20. Further, a bracket 33 that holds the nut 36 is attached to the lower surface 12 </ b> A of the kick-up portion 12 so as to face the tube 31. The bracket 33 has a cup shape in which a peripheral surface 35 is bent upward from an outer peripheral edge of the top surface 34 having a mounting hole 34a formed in a flat shape facing the upper end 31a of the tube 31, A flange 35a coupled to the lower surface 12A and the side surfaces 12B and 12C of the kick-up portion 12 is bent at the upper end edge of the peripheral surface 35. A nut 36 is attached to the top surface 34 corresponding to the attachment hole 34a.

  Further, an interference member 37 is installed between the side surfaces 12B and 12C of the kick-up portion 12. The interference member 37 installed in the kick-up portion 12 is a plate made of a high-strength steel material having both ends fixed to the side surfaces 12B and 13C and fixed to the lower surface 12A. A contact portion 38 having a U-shaped cross section is formed to be opposed to and fitted to the front surface 41a of the front end portion 41 of the fastening bolt 40 protruding from the hole 32 into the front main frame 10 with a slight gap, for example, 3 to 5 mm. Is done. By installing the interference member 37 between the side surfaces 12B and 12C, the deformation of the kick-up portion 12 is restrained, and the rigidity of the kick-up portion 12 is improved.

  The fastening bolt 40 is inserted into the tube 31 from the through-hole 25a of the connecting member 25, is fitted and fixed to the tube 31 and is firmly fixed to the rear end portion 22 of the subframe 20, and the tip portion 41 thereof is fixed. The rear end portion 22 of the sub frame 20 is fastened to the kick-up portion 12 of the main frame 10 by being inserted into a mounting hole 34 a formed in the top surface 34 of the bracket 33 and screwed into the nut 36. Further, the front side 41a of the tip 41 protruding from the bolt insertion hole 32 into the kick-up portion 12 faces the abutting portion 38 of the interference member 37 through a slight gap.

  On the other hand, a power unit P / U including an engine and a transmission is interposed via a mount member (not shown) so as to be detached when the front portion 11 is crushed and deformed in the axial direction across the front portions 11 of the pair of front main frames 10. The side portion of the power unit P / U is supported by the intermediate portion in the front-rear direction of the side frame 21 via the mount member 45.

  In such a vehicle body front structure 1, when a collision load F is input to the front end portion of the front main frame 10 as indicated by an arrow in FIG. 1 due to a frontal collision of the vehicle, the bumper stay 15 is crushed and deformed. The front portion 11 of the main frame 10 is crushed and deformed in the axial direction from the front end side. With the progress of the crushing deformation of the front portion 11, the upper part of the power unit P / U is detached at the mounting portion of the front portion 11, while the front end portion and the rear end portion 22 are fastened and fixed to the side frame 21 of the subframe 20. A compressive load Fa in the front-rear direction is generated with the portion as a fulcrum, and the side frame 21 starts to be bent downward in a V shape with the vicinity of the support point of the power unit by the mounting member 45 as shown in FIG. .

  As the side frame 21 is bent and deformed, the side frame 21 is slightly retracted and the front end 22a projecting from the rear end portion 22 as shown in FIG. 5 contacts the vicinity of the front end of the lower surface 12A of the kick-up portion 12. In contact therewith, the rearward movement of the side frame 21 is restricted. Further, the rear end portion 22 swings downward and is pushed down with the front end 22a in contact with the kick-up portion 12 as a fulcrum, and the tube tube 31 is tilted so that the upper end 31a side is in front of the lower end 31b. As the tube 31 moves downward, the bracket 33 fastened by the fastening bolt 40 and the nut 36 fitted and fixed to the tube 31 pushes down to urge the kick-up 12 downward, and the tube 31 The distal end portion 41 of the fastening bolt 40 that swings with the tilting of the contact is brought into contact with the contact portion 38 of the interference member 37 to press the interference member 37 forward, thereby suppressing the rearward movement of the kick-up portion 12.

  As a result, the upward rising deformation of the kick-up portion 12 is reduced, and the bending deformation of the continuous portion of the kick-up portion 12 and the extension portion 13 due to the collision load F input from the front to the front portion 11 is suppressed. The front portion 11 of the main frame 10 is not greatly swung upward, and the input direction of the collision load F and the axial direction of the front portion 11 are maintained coaxial, so that the stable axis of the front portion 11 in the input direction of the collision load F is maintained. The desired impact energy absorption by the direction of crushing deformation can be achieved.

  Therefore, according to the present embodiment, the collision load F is input to the front end portion of the front main frame 10 due to the frontal collision of the vehicle, and the side frame 21 is bent and deformed in the axial direction of the front main frame 10. Is generated at the rear end portion 22 of the side frame 21, and the front end 22a abuts the vicinity of the rear end of the lower surface 12A of the kick-up portion 12 to prevent the tube 31 from moving backward, and the fastening bolt The shear load acting on 40 is greatly reduced, and breakage of the fastening bolt 40 is avoided. Further, the kick-up portion 12 is urged downward along with the downward movement of the rear end portion 22 that swings downward by the bent subframe 20, and the front end portion 41 of the fastening bolt 40 is brought into contact with the interference member 37. Abutting on the contact portion 38, the kick-up portion 12 is pressed forward to suppress the rearward movement of the kick-up portion 12. As a result, the front portion 11 is bent and formed by the collision load F inputted from the front, the bending deformation of the continuous portion of the kick-up portion 12 and the extension portion 13 is suppressed, the kick-up portion 12 rises and the deformation is reduced, and the front main frame is reduced. The desired collision energy absorption by the stable axial crushing deformation can be achieved without the front part 11 of the 10 being largely swung.

  Further, the collision energy is absorbed by the bending deformation of the side frame 21 accompanying the crushing deformation of the front main member 10, and the power unit P / U is guided downward to suppress the deformation of the dash panel.

  Further, the front end portion 41 of the fastening bolt 40 fixed to the rear end portion of the side frame 21 of the sub frame 20 is projected into the kick-up portion 12, and the interference member 37 is easily disposed in the kick-up portion 12. With such a configuration, it is not necessary to stiffen the front main frame 10, and an increase in size and weight of the front main frame 10 can be avoided.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG. This embodiment is different from the first embodiment in the fastening and fixing portion 30, and the other configurations are the same as those in the first embodiment. The fastening and fixing portion 30 will be mainly described, and other detailed explanations will correspond. The description of the part is omitted by giving the same reference numeral to the part.

  The fastening and fixing portion 30 in the present embodiment has a front end 22a that protrudes rearward from the rear end portion 22 of the side frame 21, and a first through hole that vertically penetrates the lower surface portion 23 and the upper surface portion 24. 53a and 54a are opened, and the second through holes 53b and 54b are opened adjacent to the front of the first through holes 53a and 54a.

  A cylindrical first tube 51 is fitted into the first through holes 53a and 54a of the side frame 21, and is coupled to the first tube 51 and the lower surface 23 and the upper surface 24 of the side frame 21 by welding or the like.

  Similarly, the second tube 52 is fitted and inserted into the second through holes 53b and 54b of the side frame 21, and the second tube 52 and the lower surface 23 and the upper surface 24 of the side frame 21 are joined by welding or the like.

  On the other hand, the lower surface 12A of the kick-up portion 12 of the front main frame 10 has a first bolt insertion hole 32a and a second bolt insertion hole corresponding to the first tube 51 and the second tube 52 arranged in the subframe 20. 32b opens.

  Further, a bracket 33 is attached to the lower surface 12 </ b> A of the kick-up portion 12 so as to face the first tube 51 and hold the nut 36. Further, an interference member 37 is installed between the side surfaces 12B and 13C. The interference member 37 is a plate made of a high-strength steel material laid between the side surfaces 12B and 13C, and has a second fastening bolt 62 protruding into the front main frame 10 from the second bolt insertion hole 32b at the center in the vehicle width direction. A contact portion 38 having a U-shaped cross section is formed in which the front side of the front end portion 62a is fitted through a slight gap.

  The first fastening bolt 61 is inserted into the first tube 51 from the through hole 25a of the connecting member 25, and is screwed into the nut 36 provided on the bracket 33 so that the rear end portion 22 of the subframe 20 is kicked to the main frame 10. Fastened to the up portion 12.

  An attachment member to which the through hole 56 and the nut 57 corresponding to the second tube 52 are attached, for example, the suspension constituent member 55 is disposed on the subframe 20, and the second fastening bolt 62 is inserted into the second tube 52 from below. Then, the distal end 62 a of the second fastening bolt 62 passes through the through hole 56 of the suspension component 55 and is screwed into the nut 57 to fasten the suspension component 55 to the subframe 20. Furthermore, the front end 62a of the second fastening bolt 62 is opposed to the front surface of the front end 62a protruding into the front main frame 10 from the second bolt insertion hole 32b, and is brought into contact with the contact portion 38 of the interference member 37 through a slight gap. Mating.

  By configuring the fastening and fixing portion 30 in this manner, the collision load F is input to the front end portion of the front main frame 10 due to a frontal collision of the vehicle as in the first embodiment, and the front end portion of the front portion 11 is crushed and deformed. When the side frame 21 starts to be bent downward in a V shape due to the progress, the side frame 21 protrudes from the rear end 22 of the side frame 21 and the front end 22a contacts the lower end of the lower surface 12A of the kick-up portion 12. The rear end portion 22 is pivotally biased downward with the front end 22a as a fulcrum, and the first tube 51 and the second tube 52 are pushed down. As a result, the kick-up 12 is biased downward via the first fastening bolt 61 fitted and fixed to the first tube 51 and the bracket 33 fastened by the nut 36, and the second tube 52 is tilted. The tip end portion 62 a of the swinging second fastening bolt 62 abuts against the abutting portion 38 of the interference member 37 and presses forward, thereby suppressing the rearward movement of the kick-up portion 12.

  As a result, the front portion 11 is bent and formed by the collision load F input from the front, the bending deformation of the continuous portion of the kick-up portion 12 and the extension portion 13 is suppressed, the kick-up portion 12 rises, and the deformation is reduced. The desired collision energy absorption by stable axial crushing deformation can be achieved without the front part 11 of the frame 10 swinging greatly.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, in the above-described embodiment, the interference member 37 is configured by a plate member laid on the side surfaces 12B and 12C of the kick-up portion 12, but a cylinder body into which the tip end portion of the fastening bolt can be fitted is fixed to the kick-up portion 12. It can also be configured.

  Further, in the second embodiment, the suspension component member 55 is fixed on the subframe 20 by the second fastening bolt 62 and the nut 57, but other mounting members such as a cross member are fixedly installed instead of the suspension component member 55. You can also

It is a side view which shows the arrangement | positioning state of the front main frame and sub-frame in 1st Embodiment of this invention. It is the A section expansion perspective view of FIG. Similarly, it is the A section sectional view of FIG. It is a side view which shows the arrangement | positioning state of the front main frame and sub-frame after a deformation | transformation. It is the B section expanded sectional view of Drawing 4. It is sectional drawing which shows the fastening fixing | fixed part of the rear-end part of the front main frame and sub-frame in 2nd Embodiment. It is a side view which shows the arrangement | positioning state of the conventional front side member and a sub-frame. It is a side view which shows an action state. It is a side view which shows an action state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle body front part structure 10 Front main frame 11 Front part 12 Kick-up part 13 Extension part 20 Sub frame 21 Side frame 21a Front end part 22 Rear end part 22a Rear end 30 Fastening fixing part 31 Tube 33 Bracket 37 Interference member 38 Contact 40 Fastening bolt 41 Tip 51 First tube 52 Second tube 55 Suspension component (mounting member)
61 First fastening bolt 62 Second fastening bolt 62a Tip

Claims (5)

A front part that is disposed on both sides of the vehicle body in the vehicle width direction and extends in the front-rear direction, a kick-up part that is inclined downward from the rear end of the front part, and a rear part that extends rearward from the rear end of the kick-up part A front main frame having a hollow cross-section with an extension portion, and extending in the front-rear direction below the front main frame, the front end portion is fastened and fixed to the front portion, and the rear end portion is fastened to the kick-up portion A sub-frame for fixing is provided, and when the vehicle collides with the front, the sub-frame is V-shaped in the center with the fastening and fixing portions at the front and rear ends as fulcrums along with the axial deformation of the front main frame. Vehicle body front structure that bends and deforms into a shape,
A fastening bolt fixed to the rear end of the subframe and having a tip projecting into the kick-up portion;
An interference member provided in the kick-up portion and provided at the kick-up portion and facing the front surface of the tip of the fastening bolt;
A vehicle body front structure characterized in that a front end portion of the fastening bolt comes into contact with the interference portion as the subframe is bent.   The vehicle body front portion structure according to claim 1, wherein the rear end portion of the subframe and the kick-up portion are fastened by the fastening bolt.   The vehicle body front part structure according to claim 1, wherein an attachment member is fastened to the subframe by the fastening bolt. Having a tube fixed to the rear end of the subframe;
The vehicle body front part structure according to any one of claims 1 to 3, wherein the fastening bolt is fitted and fixed to the tube.   The vehicle body front part structure according to any one of claims 1 to 4, wherein a front end capable of contacting the kick-up portion is provided at a rear end portion of the subframe.

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