JP5145377B2 - 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 structure having such a front side frame, it is preferable to increase the resistance against a load acting on the center in the vehicle width direction and further increase the rigidity of the front side frame.

  The present invention provides a vehicle body front structure that can improve the support strength of the front side frame body with respect to the subframe that supports the engine, and can improve the transmission characteristics of the front impact load of the stiffener. Is an issue.

According to claim 1 invention comprises a rolled out a rectangular cross-section of the front side frame in the vehicle longitudinal direction, and the floor frame extends toward the rear of the vehicle body from the rear side of the front side frames, provided CFCs preparative side frame And a sub-frame mounting stiffener that reinforces the supporting portion of the sub-frame that supports the engine, and includes a front side frame body having a rectangular cross section on the front side frame, and the front side frame The main body is formed of a front frame portion in which the inner side wall of the front side frame main body is linear and a rear frame portion that curves from the outside to the inside, and is connected to the inner wall at the rear end of the front frame portion and is the same A stiffener that extends in a straight line, and the rear end of the stiffener is connected to the rear frame and floor frame. Attached to the outer portion of the data, the sub-frame mount stiffener is a member provided on the lower wall of the rear frame portion, provided is bulged downward together provided at the rear of the subframe mount stiffener, attaching the sub-frame a mounting portion provided on a front portion of the mounting portion comprises a reinforcing portion for reinforcing the rear frame portion, and the front end of the reinforcing portion, extending to below the front end of the stiffener, the rear end of the mount portion, the adapter The reinforcing part is formed in an L-shaped cross section, the mount part is formed in a Z-shaped or crank shape, and the inner flange of the reinforcing part and the inner side of the mounting part are formed on the inner side wall of the rear frame part. The flange is connected, the bottom of the reinforcing part is connected to the lower wall of the rear frame part, and the outer flange of the mount part is connected to the outer flange of the rear frame part. And characterized in that it is.

The invention according to claim 2 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 3 is characterized in that the stiffener has a U-shaped cross section obtained by bending the upper and lower flanges 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.

The present invention has the following effects.
In the first aspect of the invention, the front side frame having a rectangular cross section extending in the longitudinal direction of the vehicle body, the floor frame extending from the rear side of the front side frame to the rear of the vehicle body, and the front side frame are provided. And a stiffener extending in the longitudinal direction of the vehicle body, and a sub-frame mount stiffener provided on the front side frame for reinforcing the support portion of the sub-frame that supports the engine. The front side frame includes a front side frame body having a rectangular cross section.
The sub-frame mount stiffener is a member provided on the lower wall of the rear frame portion. The sub-frame mount stiffener is provided at the rear portion of the sub-frame mount stiffener and provided to bulge downward. Since the reinforcing portion that is provided at the front portion and reinforces the rear frame portion is provided, it is possible to improve the support strength of the front side frame body with respect to the subframe.
Since the front end of the reinforcing portion is extended to below the front end of the stiffener, it is possible to improve the transmission characteristics of the front impact load of the stiffener.

The reinforcing part is formed in an L-shaped cross section, the mount part is formed in a Z-shaped cross section or a crank shape, and the inner flange of the reinforcing part and the inner flange of the mounting part are coupled to the inner wall of the rear frame part. Since the bottom of the frame is joined to the lower wall of the rear frame part and the outer flange of the mount part is joined to the outer flange of the rear frame part , the subframe support strength is improved and the front side frame body is reinforced. Can do.

Since the rear end of the mount portion is provided so as to overlap the adapter, it is possible to further improve the support strength of the front side frame body with respect to the subframe.

The front side frame main body is formed of a front frame portion in which an inner wall of the front side frame main body 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 coupled to the inner wall of the rear end of the front frame portion and extends in the same linear shape is incorporated, the rear end of the stiffener is coupled to the outer portion of the adapter that couples the rear frame portion and the floor frame . Even if the rear frame portion of the front side frame main body is curved, a resistance can be generated by the adapter against the bending moment generated by the front collision load.

In the invention according to claim 2 , since the inner side wall of the front side frame main body is coupled to the inner side of the adapter, for example, even if the front side frame main body is bent to the inner side of the front side frame main body, When acting on the main body, a resistance can be generated by the adapter against a bending moment generated in the front side frame main body.

In the invention according to claim 3 , since the stiffener has a U-shaped cross section obtained by bending the upper and lower flanges from the stiffener main body, and the upper and lower flanges are coupled to the upper and lower walls of the front side frame main body, The frame main body has a closed cross section having a rectangular cross section, and the stiffener and the front side frame main body can form another closed cross section. As a result, it is possible to prevent the front side frame body from being bent at the two closed cross sections.

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. FIG. 3 is a bottom view of the front side frame of the vehicle body front structure shown in FIG. 2. It is a side view of the front side frame of the vehicle body front part structure shown by FIG. FIG. 15 is a cross-sectional view taken along line 15-15 in FIG. 14. It is the 16-16 sectional view taken on the line of FIG.

  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 front body structure 10 of the first embodiment 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 is extended from the floor frames 24 and 25 toward the outside of the vehicle 36 (in the direction of arrow a3 in FIG. 5).

  Further, a floor frame front portion 67 (see FIG. 4) extends from the adapter 22 toward the rear of the vehicle 36 (in the direction of arrow a4 in FIG. 5).

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. 4, 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. 13 to 16, the sub-frame mounting stiffener 63 is provided on the lower wall 72 of the front side frame body 18.
The subframe mount stiffener 63 is provided at the rear portion of the subframe mount stiffener 63 and bulges downward. The subframe mount stiffener 63 is provided at the front portion of the mount portion 59 for attaching the subframe 34 and the front portion. And a reinforcing portion 65 that reinforces the frame main body 18.
The front end 65 a of the reinforcing portion 65 is extended to below the front end 47 of the stiffener 46.

  The reinforcing portion 65 includes an inner flange 65b and a bottom 65c, and is formed in an L-shaped cross section when viewed in cross section. The mount part 59 includes an outer flange 59a, an inner flange 59b, and a bottom 59c, and is formed in a Z-shaped section or a crank shape in a sectional view.

  That is, the sub-frame mount stiffener 63 has a reinforcing portion 65 having an L-shaped cross section and a mount portion 59 having a Z-shaped or crank-shaped cross section, and has an L-shaped cross section on the inner wall 43 of the front side frame body 18. The inner flange 65b of the reinforcing portion 65 formed on the inner surface 59 and the inner flange 59b of the mount portion 59 formed in a Z-shaped section or a crank shape are coupled to each other, and the bottom 65c of the reinforcing section 65 having the L-shaped section is connected to the front side frame body 18 The outer flange 59a of the mount portion 59 that is coupled to the lower wall 72 and has a Z-shaped cross section or a crank shape is coupled to the outer flange 75 of the front side frame body 18.

  Further, a subframe mount stiffener 63 is provided so as to overlap the adapter 22 that couples the front side frame 17 and the floor frame 25.

  As shown in FIGS. 1 to 6 and 13 to 16, the vehicle body front structure 10 includes a front side frame 17 having a rectangular cross section extending in the longitudinal direction of the vehicle body and a rear side of the front side frame 17. A floor frame 25 extending from the side to the rear of the vehicle body, a stiffener 46 provided on the front side frame 17 and extending in the longitudinal direction of the vehicle body, and a supporting portion of a subframe 34 provided on the front side frame 17 and supporting the engine 32 A subframe mount stiffener 63 for reinforcing the frame.

  The subframe mount stiffener 63 is a member provided on the lower wall 72 of the front side frame main body 18. The subframe mount stiffener 63 is provided at the rear portion of the subframe mount stiffener 63 and bulges downward to mount the subframe 34. 59 and the reinforcing portion 65 provided at the front portion of the mount portion 59 for reinforcing the front side frame main body 18, the support strength of the front side frame main body 18 with respect to the sub frame 34 can be improved. it can.

  Since the front end 65a of the reinforcing portion 65 is extended below the front end 47 of the stiffener 46, the transmission characteristics of the front impact load of the stiffener 46 can be improved.

  The sub-frame mount stiffener 63 has a reinforcing portion 65 formed in an L-shaped cross section and a mount portion 59 formed in a Z-shaped or crank shape, and formed in an L-shaped cross section on the inner wall 43 of the front side frame main body 18. The inner flange 65b of the reinforced portion 65 and the inner flange 59b of the mount portion 59 formed in a Z-shaped or crank shape are coupled, and the bottom 65c of the L-shaped reinforcing portion 65 is below the front side frame body 18. Since the outer flange 59a of the mount portion 59 that is coupled to the wall 72 and has a Z-shaped cross section or a crank shape is coupled to the outer flange 75 of the front side frame main body 18, the subframe support strength is improved and the front frame is improved. The side frame body 18 can be reinforced.

  Since the sub-frame mount stiffener 63 is provided so as to overlap the adapter 22 that couples the front side frame 17 and the floor frame 25, the support strength of the front side frame main body 18 with respect to the sub frame 34 can be further improved. .

  The front side frame main body 18 is formed of a front frame portion 38 having an inner wall 43 that is linear 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 coupled to the rear end 48 of the front frame portion 38 and extending in 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, for example, the rear portion of the front side frame main body 18. Even if the frame portion 41 is curved, it is possible to counteract the bending moment by generating a drag force with the adapter 22 against the bending moment generated by the front collision load.

  Since the inner side wall 43 of the front side frame main body 18 is coupled to the inner portion 56 of the adapter 22, for example, even if the inner side wall 43 is bent to the inner side of the front side frame main body 18, the front impact load is applied to the front side frame main body 18. When acting, the adapter 22 can generate a drag against the bending moment generated in the front side frame 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.

  As shown in FIGS. 15 and 16, the vehicle body front structure according to the present invention has a subframe mount stiffener 63, a reinforcing portion 65 formed in an L-shaped section, and a mount portion 59 formed in a Z-shaped section or Although formed in a crank shape, the present invention is not limited to this, and the reinforcing portion and the mount portion may be formed in a U shape.

  INDUSTRIAL APPLICABILITY The present invention is suitable for application to an automobile having a vehicle body front structure provided with a subframe mount stiffener that reinforces a support portion of a subframe that supports an engine.

  DESCRIPTION OF SYMBOLS 10 ... Car body front part structure, 17 ... Front side frame, 18 ... Front side frame main body, 22 ... Adapter, 25 ... Floor frame, 28 ... Car compartment, 29 ... Engine room, 32 ... Engine, 38 ... Front frame part, 41 ... rear frame portion, 43, 44 ... inner and outer walls, 46 ... stiffener, 47 ... front end of stiffener, 48 ... rear end of front frame portion, 51 ... rear end of stiffener, 55 ... side wall (outer portion), 56 ... side wall (inner side), 59 ... mount part, 59a ... outer flange, 59b ... inner flange, 63 ... subframe mount stiffener, 65 ... reinforcing part, 65a ... front end, 65b ... inner flange, 71, 72 ... upper and Lower wall, 75 ... outer flange, 101 ... stiffener body, 102,103 ... upper and lower flanges.

Claims (3)

And extends out a rectangular cross-section of the front side frame in the vehicle longitudinal direction, and the floor frame extends toward the rear of the vehicle body from the rear side of the front side frames provided on CFCs preparative side frame, sub-frame supporting the engine A vehicle body front structure comprising a sub-frame mount stiffener that reinforces the support part of
The front side frame includes a front side frame body having a rectangular cross section,
The front side frame main body is formed of a front frame portion in which an inner wall of the front side frame main body is linear and a rear frame portion that curves from the outside to the inside, and at the rear end of the front frame portion. A stiffener that is coupled to the inner wall and extends in the same straight line is incorporated, and a rear end of the stiffener is coupled to an outer portion of the adapter that couples the rear frame portion and the floor frame,
The sub-frame mount stiffener is a member provided on the lower wall of the rear frame portion. The sub-frame mount stiffener is provided at the rear portion of the sub-frame mount stiffener and is bulged downward, and a mount portion for mounting the sub-frame, A reinforcing portion that is provided at a front portion of the mount portion and reinforces the rear frame portion , and extends a front end of the reinforcing portion to a position below a front end of the stiffener, and a rear end of the mount portion is connected to the adapter. The reinforcing portion is formed in an L-shaped cross section, the mount portion is formed in a Z-shaped or crank shape, and an inner flange of the reinforcing portion and an inner wall of the rear frame portion, An inner flange of the mount portion is coupled, a bottom of the reinforcement portion is coupled to a lower wall of the rear frame portion, and an outer flange of the mount portion is coupled. Vehicle body front structure, characterized in that Nji is coupled to the outer flange of the rear frame portion. The front side frame body, the inner wall is, the vehicle body front structure according to claim 1, wherein the binding to the inner portion of the adapter. The stiffener is a U-shaped cross section by bending the upper and lower flanges from stiffener body, the on and the lower flange, claim 1 or claim, characterized in that the binding to the above and lower wall of the front side frame body Item 2. The vehicle body front structure according to Item 2 .

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