JP5145376B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure in which a front side frame extends in the longitudinal direction of a vehicle body, and a floor frame extends from the rear side of the front side frame to the rear of the vehicle body.

As a vehicle body front structure, it has a hollow frame member that extends in the longitudinal direction of the vehicle body, has a rear end connected to the dash panel, and has left and right side portions and upper and lower horizontal surface portions and has a substantially rectangular cross section. There is something.
The frame member is provided with a planned bending portion that bends to one side in the vehicle width direction when an impact load in the longitudinal direction of the vehicle body is applied. Further, the reinforcing member that contacts the inner surface of the side surface portion of the frame member opposite to the one side in the vehicle width direction from the middle of the bending of the frame member into the inner space in the predetermined range including the planned bending portion of the frame member. Is provided.

  According to this vehicle body front part structure, it is possible to prevent the bending of the frame member from proceeding at a stroke when a front collision load is applied (see, for example, Patent Document 1).

  The front body structure includes a pair of left and right front frames. The front frame is welded to an axial load receiving member having a linear first ridge line over the entire length in the longitudinal direction, and the axial load receiving member. The moment receiving member includes a second ridge line that branches from a substantially central portion in the front-rear direction of the first ridge line and curves inward as it goes rearward.

  According to this vehicle body front part structure, the bending moment generated in the curved part of the front frame can be reduced, and a front collision load can be received by the shaft of the frame (see, for example, Patent Document 2).

JP 2009-234495 A JP 2006-290311 A

  Here, the vehicle body front part structure of Patent Document 1 can suppress the bending of the frame member from proceeding at a stroke when a front collision load is applied. The vehicle body front part structure of Patent Document 2 can reduce the bending moment generated in the curved portion of the front frame (front side frame). However, in the vehicle body front part structure having such a front side frame, it is desired that the front collision load can be efficiently transmitted when a front collision load acts on the front side frame.

  The present invention can reinforce the coupling between the front side frame and the floor frame. For example, even when a front collision load is applied to the front side frame, the front collision load can be transmitted efficiently. It is an object to provide a partial structure.

The invention according to claim 1 includes a front side frame extending in the longitudinal direction of the vehicle body, a dashboard lower panel extending in the vehicle width direction and downwardly inclined to the rear of the vehicle body, and partitioning the engine room and the vehicle compartment, A vehicle body front structure comprising a floor frame extending from the rear side of the front side frame to the rear of the vehicle body and an adapter for connecting the floor frame and the front side frame, the front side frame having a rectangular cross section The front frame is equipped with a front part of the floor frame along the inclined surface of the dashboard lower panel that is inclined downward to the rear of the vehicle body. and binding to overlap four inner surfaces of the lower wall, the box shape having four side walls comprising a bottom wall and coupling face Exhibited cross member 3 of the side wall of the adapter, the outer longitudinal portion of the front floor frame, the bottom, overlapping bonded to the outer surface of the inner longitudinal section, one side wall remaining is disposed in the passenger compartment sides of the dashboard lower panel It is characterized by combining with.

  The invention according to claim 2 is characterized in that the front side frame body is formed of a front frame portion having a linear inner wall and a rear frame portion that curves from the outside to the inside, and a rear end of the front frame portion, A stiffener that is coupled and extends in the same straight line is built in, and a rear end of the stiffener is coupled to an outer portion of the adapter.

  The invention according to claim 3 is characterized in that the inner side wall of the front side frame body is coupled to the inner side of the adapter.

  The invention according to claim 4 is characterized in that the stiffener has a U-shaped cross section in which the upper and lower flanges are bent from the stiffener body, and the upper and lower flanges are coupled to the upper and lower walls of the front side frame body. To do.

  According to a fifth aspect of the present invention, the adapter includes: a main body part that bends one plate material to form a bottom wall and a side wall that becomes a joint surface of the three surfaces; and a separate reinforcing plate that is fitted to the main body part. A box shape is formed, and the side wall of the reinforcing plate forms the remaining one coupling surface.

The present invention has the following effects.
In the invention according to claim 1, a front side frame extending in the longitudinal direction of the vehicle body, a dashboard lower panel extending in the vehicle width direction and downwardly inclined to the rear of the vehicle body, and partitioning the engine room and the vehicle compartment; A floor frame extending from the rear side of the front side frame to the rear of the vehicle body; and an adapter for coupling the floor frame and the front side frame. The front side frame includes a front side frame body having a rectangular cross section. The floor frame is provided with a front portion of the floor frame along an inclined surface inclined downward to the rear of the vehicle body of the dashboard lower panel.
Adapter, the inner and outer walls of the front side frame body, coupled to overlap four inner surfaces of the upper and lower wall, so exhibits a box shape having four side walls comprising a bottom wall and a coupling surface, the front side frame and the floor Bonding with the frame can be strengthened.
Furthermore, the three side walls of the adapter are overlapped and joined to the outer vertical, bottom and inner vertical surfaces of the front part of the floor frame, and the remaining one side wall is arranged on the vehicle compartment side with the dashboard lower panel interposed therebetween. For example, even when a front collision load acts on the front side frame, the front collision load can be received by the rear cross member. Thereby, a front collision load can be transmitted efficiently.

In the invention according to claim 2, the front side frame main body is formed of a front frame portion whose inner wall is linear and a rear frame portion that curves from the outside to the inside. As a result, the front side frame main body can be constituted by, for example, a main body having a U-shaped cross section and a lid member, so that the manufacturing can be easily performed, the mold cost can be reduced, and the assembling property can be improved. It is possible to improve the accuracy of parts.
Since the stiffener that is connected to the rear end of the front frame portion and extends in the same linear shape is built in, and the rear end of the stiffener is connected to the outer portion of the adapter, for example, when a front impact load acts on the front side frame body, It can be transmitted linearly to the adapter.

  In the invention according to claim 3, since the inner side wall of the front side frame main body is coupled to the inner side of the adapter, for example, when a front impact load acts on the front side frame main body, the inner side wall is bent to the inner side of the front side frame main body. Even if the shape is different, the adapter can generate a resistance against the bending moment generated in the front side frame body.

In the invention which concerns on Claim 4, a stiffener is the U-shaped cross section which bent the upper and lower flange from the stiffener main body.
Since the upper and lower flanges are connected to the upper and lower walls of the front side frame main body, the front side frame main body has a closed cross section with a rectangular cross section, and the stiffener and the front side frame main body have another A closed cross section can be formed. As a result, it is possible to prevent the front side frame body from being bent at the two closed cross sections.

  In the invention according to claim 5, the adapter includes a main body part that bends one plate material to form a side wall that becomes a coupling surface of the bottom wall and the three surfaces, and a separate reinforcing plate that is fitted to the main body part. Since the box shape is formed and the side wall of the reinforcing plate forms the remaining one coupling surface, the adapter can be easily manufactured by press forming of a steel plate. In addition, the strength of either the main body or the reinforcing plate can be increased, and the strength of the adapter can be designed assuming the magnitude of the transmission load. That is, the transmission load can be controlled.

It is a perspective view which shows the vehicle body which employ | adopted the vehicle body front part structure which concerns on this invention. It is a perspective view of the vehicle body front part structure concerning the present invention. FIG. 3 is a perspective view of the front body structure shown in FIG. 2 as viewed from the passenger compartment side. FIG. 3 is a perspective view of a front side frame of the vehicle body front part structure shown in FIG. 2. FIG. 3 is a perspective view showing the inside of a front side frame of the vehicle body front part structure shown in FIG. 2. FIG. 3 is a plan view of a front side frame of the vehicle body front structure shown in FIG. 2. FIG. 3 is an exploded perspective view of a front side frame of the vehicle body front part structure shown in FIG. 2. FIG. 3 is an exploded plan view of a front side frame of the vehicle body front structure shown in FIG. 2. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 4. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 4. It is the 11-11 line sectional view of Drawing 4. FIG. 12 is a sectional view taken along line 12-12 of FIG. 4.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

As shown in FIGS. 1 to 3, the vehicle body front structure 10 is employed on the front side of the vehicle body 13. In order to absorb the impact (load) by the left and right front side frames 16 and 17 when a frontal collision occurs, an adapter is mainly attached to the frame rear end 21 of the front side frame body 18 (see FIG. 3) of the front side frames 16 and 17. (Box member) 22 is joined, and left and right floor frames 24 and 25 are joined to this adapter 22, respectively.
This will be specifically described below.

The vehicle body 13 includes an underbody 31 that forms an engine room (front body) 29 in front of the passenger compartment 28 and a floor (floor) 31 a of the passenger compartment 28.
The engine room 29 has the front side frame 16 on the left and the front side frame 17 on the right.
These front side frames 16 and 17 support the engine 32 and the transmission 33. The front side frames 16 and 17 are almost the object.

The front side frames 16 and 17 are curved as shown in FIG. 6 in order to arrange the engine 32 and the transmission 33 horizontally.
The engine 32 and the transmission 33 are integrally mounted on the subframe 34 as shown in FIG. The sub frame 34 is supported by attaching it to the left and right front side frames 16 and 17 as indicated by an arrow a1 from below.

  The underbody 31 includes left and right floor frames 24 and 25 that are continuous with left and right front side frames 16 and 17, respectively.

  Next, the main structure of the vehicle body front structure 10 will be described with reference to FIGS.

  As shown in FIGS. 2 and 3, the vehicle body front structure 10 includes a front side frame 17 that extends in the vehicle body front-rear direction, and extends downwardly in the vehicle width direction and rearward of the vehicle body. A dashboard lower panel 19 that partitions the room 29 and the vehicle compartment 28; a floor frame 25 that extends from the rear side of the front side frame 17 toward the rear of the vehicle body; and an adapter 22 that connects the floor frame 25 and the front side frame 17; The adapter 22 is disposed on the side of the vehicle compartment 28 with the dashboard lower panel 19 interposed therebetween, the stiffener 46 provided on the front side frame 17 to reinforce the front side frame body 18, and the front side frame 17 is provided to reinforce the support portion of the subframe 34 that supports the engine 32 A sub-frame mount stiffener (subframe central mounting portion) 63, provided on the front side frame 17 includes a first and second bracket 61 of the engine mount (not shown) for mounting, a. The second bracket 62 is a collar nut holding bracket described later.

  As shown in FIGS. 3 and 4, the floor frame 25 includes a floor frame front portion 67 along an inclined surface 19 a inclined downward toward the rear of the vehicle body of the dashboard lower panel 19.

  The vehicle body front structure 10 is provided with left and right front side frames 16, 17 extending from the front of the vehicle 36 toward the floor of the rear compartment 28, and floor floor frames 24, 25 are connected to the front side frames 16, 17. I am letting.

  In the front side frames 16 and 17, the front side frame main body 18 has a rectangular cross section and forms a hollow. As shown in FIG. 6, the front frame portion (front side) 38 is linear, and the rear frame portion (rear side) Side) 41 is curved so as to approach each other, and includes an inner side wall 43 facing the inside of the vehicle 36 and an opposite outer side wall 44.

The floor frames 24 and 25 are joined to the rear end 21 of the front side frame main body 18 with an adapter 22.
The stiffener 46 is disposed inside the rear frame portion 41 (and the rear side of the front side frame 17) of the front side frame main body 18, and the front end 47 of the stiffener 46 is connected to the rear end of the front frame portion 38 of the inner wall 43 ( The rear end 51 of the stiffener 46 is joined to the rear end 53 of the outer wall 44.

  Further, the side wall (outer part) 55 (see FIG. 5) of the adapter 22 is joined to the rear end 51 of the stiffener 46, and at least the side wall (inner part) of the adapter 22 facing the side wall (outer part) 55. ) 56 is joined to the rear end 21 of the frame.

  The upper flange 102 and the lower flange 103 of the stiffener 46 are joined to an upper wall 71 and a lower wall 72 (see FIG. 4) that are continuous with the inner wall 43 and the outer wall 44 of the front side frame body 18, respectively.

Next, the front side frame 17 will be described in detail with reference to FIGS.
FIG. 5 shows a state in which the lid member 27 having the outer wall 44 is removed from the main body 26.

  The front side frame main body 18 is a closed cross-section frame in which a U-shaped main body 26 that opens outward and a lid member 27 that closes the main body 26 are combined, and a front frame portion 38 (see FIG. 6), the rear is referred to as a rear frame portion 41. The front side frame body 18 includes a subframe front mount 58 (see FIG. 4) that hangs down from the tip.

  Furthermore, a first bracket 61 and a second bracket 62 for attaching an engine mount (not shown), a stiffener 46, and a subframe mount stiffener 63 are provided.

  On the other hand, the subframe rear mount portion 64 (see FIG. 5) is provided on the floor frames 24 and 25. In addition, the outrigger 66 extends from the floor frames 24 and 25 toward the outside of the vehicle 36.

  Further, a floor frame front portion 67 (see FIG. 4) extends from the adapter 22 toward the rear of the vehicle 36.

Next, the front side frame main body 18 of the front side frames 16 and 17 will be described in detail.
The front side frame main body 18 is formed in a U-shaped cross section and joined to the outer wall 44 to form a rectangular cross section, in other words, a U-shaped main body 26 that opens outward, and an outer wall 44 that closes the main body 26. A closed cross-sectional shape is formed with the lid member 27 provided with

The U-shaped main body 26 is formed by an inner wall 43, an upper wall 71, and a lower wall 72.
The opening of the front side frame main body 18 is arranged toward the outside of the vehicle 36 (in the direction of the arrow a3 in FIG. 5), and an outer flange (welding flange portion) 74 is formed so as to be connected to the upper wall 71 and connected to the lower wall 72. An outer flange (welding flange portion) 75 (see FIG. 9) is formed.

As shown in FIG. 6, the outer side wall 44 (lid member 27) is formed with a first valley fold portion 81, a mountain fold portion 82, and a second valley fold portion 83 in order from the front.
The first valley fold 81 is formed slightly forward from the center located at half the total length of the front side frame 17. In the outer side wall 44, the outer wall front portion 85 is formed obliquely from the tip to the first valley fold portion 81.
The “oblique” is a form in which the cross-sectional area of the front side frame 17 is gradually decreased from the maximum of the front end to the minimum of the first valley bent portion 81 by inclining from the front end toward the inner wall 43.

  In the front side frame body 18, a closed cross section 126 (see FIG. 2) having a rectangular cross section is formed. Furthermore, another closed cross section 127 is formed by the stiffener 46 and the front side frame body 18.

Next, the first bracket 61 and the second bracket 62 for supporting the engine will be described in detail with reference to FIG.
Next, the stiffener 46 will be described in detail with reference to FIGS.

The first bracket 61 is provided in the center and in the middle of the front frame portion 38 of the front side frame 17 at a position that is substantially half the total length.
The first bracket 61 is formed with a first inner joint portion 87 joined to the inner side wall 43, and a first partition portion 88 is formed continuously with the first inner joint portion 87.

  The first upper joining piece 91 is formed so as to be sandwiched and joined between the upper wall 71 (welding flange portion 74) and the outer wall 44 in connection with the first partition portion 88. A first lower joining piece 92 is formed so as to be sandwiched between and joined to the lower wall 72 (welding flange portion 75) and the outer wall 44 in connection with the first partition portion 88. The first bracket 61 is provided with a color nut 78 for attaching an engine mount (not shown).

The second bracket 62 (collar nut holding bracket) is formed with a second inner joint portion 95 joined to the inner wall 43, and a second partition portion 96 is formed continuously with the second inner joint portion 95.
A second upper joining piece 97 is connected to the second partition portion 96 and is formed so as to be sandwiched and joined between the upper wall 71 (welding flange portion 74) and the outer wall 44. A second lower joining piece 98 is connected to the second partition part 96 and is formed so as to be sandwiched and joined between the lower wall 72 (welding flange part 75) and the outer wall 44. The second bracket 62 is provided with a color nut 79 for attaching an engine mount (not shown).

The stiffener 46 extends rearward of the vehicle so as to substantially match the extension line of the inner wall 43 of the front frame portion 38 of the front side frame 17.
In the stiffener 46, the front end 47 of the stiffener body 101 is joined to the inner wall 43 of the front side frame body 18, and the upper flange 102 of the stiffener body 101 is joined to the upper wall 71 of the front side frame body 18.

Further, the lower flange 103 of the stiffener body 101 is joined to the lower wall 72 of the front side frame body 18, and the rear end 51 of the stiffener body 101 is sandwiched between the adapter 22 and the outer wall 44 and joined.
The stiffener 46 is stronger than the front side frame body 18.

  Further, the front side frame main body 18 is formed of a front frame portion 38 whose inner wall 43 on the inner side of the vehicle body on the main body 26 side is linear, and a rear frame portion 41 that curves from the outside to the inside, and the front frame A stiffener 46 coupled to the rear end 48 of the portion 38 and extending in the same straight line is incorporated, and a front end 47 of the stiffener 46 is provided behind a collar nut holding bracket (second bracket) 62 for attaching an engine mount (not shown). .

  As described above, the front side frame main body 18 is formed of the front frame portion 38 whose inner wall 43 is linear and the rear frame portion 41 curved from the outside to the inside, and the rear end 48 of the front frame portion 38. It can be said that a stiffener 46 that is coupled to the same straight line is incorporated, and the rear end 51 of the stiffener 46 is coupled to the outer portion 55 of the adapter 22.

  The stiffener 46 has a U-shaped cross section in which the upper and lower flanges 102 and 103 are bent from the stiffener body 101, and the upper and lower flanges 102 and 103 are coupled to the upper and lower walls 71 and 72 of the front side frame body 18. It is also a member.

Next, the adapter 22 will be described in detail mainly with reference to FIGS.
The adapter 22 is fitted to the frame rear end 21 of the front side frame 17 with the opening directed toward the rear of the vehicle 36 (see FIG. 1).

  The adapter 22 bends one plate material to form a main body portion 124 that forms side walls 55, 56, and 118 that serve as coupling surfaces of the bottom wall 106 and the three surfaces, and a separate reinforcing portion 125 that is fitted to the main body portion 124. , A box shape is formed, and the side wall 113 of the reinforcing portion 125 forms the remaining one coupling surface.

The adapter 22 includes a main body portion 124 and a reinforcing portion 125 joined to the main body portion 124. A bottom wall (partition side portion) 106 is formed in the main body portion 124 so as to partition the inside of the front side frame 17.
A side wall (outer part) 55, a side wall (inner part) 56, and a side wall 118 are bent from the bottom wall 106.

The outer surface of the side wall (inner part) 56 overlaps and is joined to the inner surface of the inner wall 43 of the front side frame 17.
On the other hand, the inner surface of the side wall (inner portion) 56 overlaps and is joined to the outer surface of the inner vertical portion 108 of the floor frame 25.

The main body portion 124 of the adapter 22 is formed with a side wall (outer portion) 55 facing each other.
The outer surface of the side wall (outer part) 55 overlaps and is joined to the rear end 51 of the stiffener body 101 as shown in FIG.

  Further, the outer surface of the side wall (outer part) 55 overlaps and is joined to the outer wall 44 of the front side frame 17. On the other hand, the inner surface of the side wall (outer portion) 55 overlaps and is joined to the outer surface of the outer vertical portion 112 of the floor frame 25.

  The outer surface of the side wall 118 overlaps and is joined to the inner surface of the lower wall 72 of the front side frame 17. On the other hand, the inner surface of the side wall 118 overlaps and is joined to the outer surface of the bottom 121 of the floor frame 25.

Further, the reinforcing portion 125 of the adapter 22 is formed with a side wall (connection ceiling portion) 113 connected to the main body portion 124. The side wall (connecting top) 113 overlaps and is joined to the inner surface of the upper wall 71 of the front side frame 17.
A reinforcing rib portion 115, a reinforcing rib portion 125a, a welding flange 116, and a welding flange 125b orthogonal to the connecting top portion 113 are formed on the side wall (connecting top portion) 113.

The reinforcing rib portion 115 and the reinforcing rib portion 125a are joined (joined) to the cross member 23 arranged on the vehicle compartment 28 side with the dashboard lower panel 19 shown in FIG.
The welding flange 116 is welded to the side wall (outer part) 55 of the main body part 124. The welding flange 125 b is welded to the side wall (inner portion) 56 of the main body portion 124.

That is, the adapter 22 has a box shape that couples to the four surfaces of the inner and outer walls 43 and 44 and the upper and lower walls 71 and 72 of the front side frame main body 18, and the adapter 22 sandwiches the dashboard lower panel 19. It is a member couple | bonded with the cross member 23 arrange | positioned at the side.
Further, it can be said that the inner side wall 43 of the front side frame body 18 is coupled to the inner portion 56 of the adapter 22.

  As shown in FIGS. 1 to 12, in the vehicle body front structure 10, a front side frame 17 that extends in the vehicle longitudinal direction, and a vehicle that extends downwardly in the vehicle width direction and rearward of the vehicle, A dashboard lower panel 19 that partitions the room 29 and the vehicle compartment 28; a floor frame 25 that extends from the rear side of the front side frame 17 toward the rear of the vehicle body; and an adapter 22 that connects the floor frame 25 and the front side frame 17; .

  Since the adapter 22 has a box shape that couples to the four surfaces of the inner and outer walls 43 and 44 and the upper and lower walls 71 and 72 of the front side frame main body 18, the coupling between the front side frame 17 and the floor frame 25 is strengthened. be able to.

  Further, since the adapter 22 is coupled to the cross member 23 disposed on the side of the vehicle compartment 28 with the dashboard lower panel 19 interposed therebetween, for example, even when a front collision load acts on the front side frame 17, the rear cross member 23 Can receive a front impact load. Thereby, a front collision load can be transmitted efficiently.

  The front side frame main body 18 is formed of a front frame portion 38 having a linear inner wall 43 and a rear frame portion 41 that curves from the outside to the inside. Thereby, since the front side frame main body 18 can be comprised by the main body 26 and the lid member 27 of a U-shaped cross section, for example, it can manufacture easily and can aim at reduction of die cost, and an assembly. It is possible to improve the performance, and it is possible to improve the component accuracy.

  Since the stiffener 46 that is coupled to the rear end 48 of the front frame portion 38 and extends in the same straight line is incorporated, and the rear end 51 of the stiffener 46 is coupled to the outer side portion 55 of the adapter 22, for example, a frontal impact load is applied to the front side frame. When acting on the body 18, it can be transmitted linearly to the adapter.

  Since the inner side wall 43 of the front side frame main body 18 is coupled to the inner side portion 56 of the adapter 22, for example, when a front collision load acts on the front side frame main body 18, the shape bent to the inner side of the front side frame main body 18. Even so, the adapter 22 can generate a drag against the bending moment generated in the front side frame main body 18 to cancel the bending moment.

  The stiffener 46 has a U-shaped cross section in which the upper and lower flanges 102 and 103 are bent from the stiffener main body 101, and the upper and lower flanges 102 and 103 are coupled to the upper and lower walls 71 and 72 of the front side frame main body 18. Therefore, the front side frame main body 18 has a closed cross section 126 having a rectangular cross section, and the stiffener 46 and the front side frame main body 18 can form another closed cross section 127. As a result, it is possible to prevent the front side frame body 18 from being bent by the two closed cross sections 126 and 127.

  The adapter 22 bends a single plate material to form a side wall 55, 56, 118 that serves as a coupling surface of the bottom wall 106 and the three surfaces, and a separate reinforcing portion 125 that is fitted to the main body portion 124. Since the box shape is formed and the side wall 113 of the reinforcing portion 125 forms the remaining one coupling surface, the adapter 22 can be easily manufactured by press forming of a steel plate. In addition, the strength of either the main body 124 or the reinforcing portion 125 can be increased, and the strength of the adapter 22 can be designed assuming the magnitude of the transmission load. That is, the transmission load can be controlled.

  In the vehicle body front structure according to the present invention, as shown in FIGS. 2 and 3, the adapter 22 is coupled to the cross member 23 disposed on the vehicle compartment 28 side with the dashboard lower panel 19 interposed therebetween. The present invention is not limited to this, and it may be coupled only to the dashboard lower panel 19 or to another reinforcing member provided around the dashboard lower panel 19.

  INDUSTRIAL APPLICABILITY The present invention is suitable for application to an automobile having a vehicle body front part structure that includes an adapter that couples a floor frame and a front side frame.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle body front structure, 17 ... Front side frame, 18 ... Front side frame main body, 19 ... Dashboard lower panel, 22 ... Adapter, 23 ... Cross member, 25 ... Floor frame, 28 ... Car compartment, 29 ... Engine room, 38 ... front frame part, 41 ... rear frame part, 43, 44 ... inner and outer walls, 46 ... stiffener, 48 ... rear end of front frame part, 51 ... rear end of stiffener, 55 ... side wall (outer part) 56 ... Side walls (inner side), 71, 72 ... Upper and lower walls, 101 ... Stiffener body, 102, 103 ... Upper and lower flanges, 106 ... Bottom wall, 113 ... Side wall, 118 ... Side wall, 124 ... Body part, 125. Reinforcing part.

Claims (5)

A front side frame extending in the longitudinal direction of the vehicle body, a dashboard lower panel extending downward in the vehicle width direction and rearward of the vehicle body and partitioning the engine room and the vehicle compartment, and the vehicle body from the rear side of the front side frame A vehicle body front structure comprising a floor frame extending rearward and an adapter for coupling the floor frame and the front side frame,
The front side frame includes a front side frame body having a rectangular cross section,
The floor frame includes a front portion of the floor frame along an inclined surface inclined downward to the rear of the dashboard lower panel.
Said adapter, said front side frame body of the inner and outer walls, that bind overlap four inner surfaces of the upper and lower wall, it presents a box shape having four side walls comprising a bottom wall and a coupling surface, 3 of the adapter One side wall overlaps and joins the outer vertical, bottom and inner vertical surfaces of the front portion of the floor frame, and the remaining one side wall joins a cross member disposed on the vehicle compartment side with the dashboard lower panel interposed therebetween. A vehicle body front structure characterized by that. Before SL front side frame body, the inner wall comprises a front frame part straight, while being formed from a rear frame portion which is curved from the outside to the inside, the same straight line combined with the rear end of the front frame portion The vehicle body front part structure according to claim 1, wherein a stiffener extending in a shape is incorporated, and a rear end of the stiffener is coupled to an outer portion of the adapter.   The vehicle body front part structure according to claim 1 or 2, wherein an inner wall of the front side frame body is coupled to an inner part of the adapter.   The stiffener has a U-shaped cross-section in which upper and lower flanges are bent from a stiffener body, and the upper and lower flanges are coupled to upper and lower walls of the front side frame body. The vehicle body front part structure according to claim 3.   The adapter is formed in a box shape from a main body that bends a single plate material to form a bottom wall and a side wall of three coupling surfaces, and a separate reinforcing portion that is fitted to the main body. The vehicle body front part structure according to any one of claims 1 to 4, wherein the side wall forms the remaining one coupling surface.

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