JP5238750B2 - 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, a reinforcing member that comes into contact with 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 in the inner space of the predetermined front and rear 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).

  Further, as the vehicle body front structure, it has a pair of left and right front frames, and the front frame is welded to the axial load receiving member having a linear first ridge over the entire length in the longitudinal direction, and the axial load receiving member. There is one constituted by a moment receiving member provided with a second ridge line that branches off 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 necessary to consider that the load acting in the axial direction of the front side frame can be transmitted smoothly.

  The present invention provides a vehicle body front structure that can smoothly transmit a load acting in the axial direction of a front side frame body of a front impact load to a floor frame, and can improve an engine support strength. This is the issue.

The invention according to claim 1 includes a front side frame having a rectangular cross section extending in the longitudinal direction of the vehicle body, a dash that extends downward in the vehicle width direction and rearward of the vehicle body, and partitions the engine room and the vehicle compartment. and board lower panel, and the floor frame extends toward the rear of the vehicle body from the rear side of the front side frame, a vehicle body front structure provided with a front side frame is provided with a welding flange in the vertical as well as open to the outside a U-shaped cross section of the body was, by a lid member for closing the body by welding the top and bottom of the weld flange, with a front-side frame body, the front side frame body, the body-side vehicle body inward of the inner wall straight Of the front side frame body, and a rear frame part whose inner wall on the inside of the body side vehicle body curves from the outside to the inside. A Department frame portion and the floor frame linked through the adapter, the front frame part, between the junction of U-shaped cross section of the joint portion of the inner wall of the body and a U-shaped cross-section of the body and the lid member A collar nut holding bracket for mounting the engine mount having a partition portion, and the collar nut holding bracket for mounting the engine mount is formed with an inner joint portion joined to the inner wall, and is connected to the inner joint portion to partition The upper joining piece is formed so as to be sandwiched and joined between the upper welding flange portion and the lid member, and the lower joining piece is joined to the lower welding flange portion and the lid member. is formed so as to be caught bonded, a structure in which color nuts for engine mount attached to the collar nut retaining bracket is provided, the rear frame portion 41 includes an inner wall of the rear end of the frame portion Incorporates a stiffener extending in the same straight line as the combined front frame portion of the inner wall, the front end of the stiffener is provided behind the collar nut holding bracket for the engine mount attachment, coupling the rear end of the stiffener on the outer portion of the adapter In addition, the inner side wall of the rear frame portion is coupled to the inner side portion of the adapter .

  According to a second aspect of the present invention, the floor frame includes a front portion of the floor frame along an inclined surface that is inclined downward toward the rear of the vehicle body of the dashboard panel, and a stiffener and a lid member are provided on the inner wall of the rear frame portion. A bead is formed so as to be overlapped with each other and directed to the front portion of the floor frame.

  The invention according to claim 3 is characterized in that the stiffener is stronger than the front side frame body.

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.

The present invention has the following effects.
In the invention according to claim 1, the front side frame having a rectangular cross section extending in the longitudinal direction of the vehicle body and the dash that extends downward in the vehicle width direction and rearward of the vehicle body and partitions the engine room and the vehicle compartment. A board lower panel and a floor frame extending from the rear side of the front side frame to the rear of the vehicle body.
The front side frame has a U-shaped main body that opens to the outside and a front side frame main body that is joined to a lid member that closes the main body, making it easy to manufacture the front side frame main body. In addition, the mold cost can be reduced, the assembling property can be improved, and the accuracy can be improved.
The front side frame body is formed of a front frame portion whose inner wall on the inner side of the main body side vehicle body is linear, and a rear frame portion whose inner side wall on the inner side of the main body side vehicle body curves from the outside to the inner side. The rear frame portion of the main body and the floor frame are coupled via an adapter, and the front frame portion is joined to the joint portion of the inner wall of the U-shaped cross-section main body and the joint portion of the U-shaped cross-section main body and the lid member. There is a collar nut holding bracket for engine mount mounting with a partition in between, the rear frame part has a stiffener that is connected to the rear end of the front frame part and extends in the same straight line, and the front end of the stiffener is the engine provided behind the collar nut retaining bracket for mounting the mounting, because it binds to the outer rear end of the adapter of the stiffener, the previous collision load of the front side frame body axis It is possible to transmit to the smooth floor frames the load acting on the direction, it is possible to improve the support strength of the engine.

In the invention which concerns on Claim 2, the floor frame is provided with the front part of the floor frame along the inclined surface inclined downward to the vehicle body rear side of the dashboard panel.
Since the bead directed to the front portion of the floor frame is formed on the inner wall of the rear frame portion so as to overlap the stiffener and the lid member in a side view, the front collision load can be smoothly transmitted to the floor frame.

  In the invention according to claim 3, since the stiffener is stronger than the front side frame body, it is possible to improve the transmission characteristics of the front impact load acting in the axial direction of 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 are another one. 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.

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 perspective view of a front side frame of the vehicle body front part structure shown in FIG. 2. FIG. 3 is a side view of a front side frame of the vehicle body front part structure shown in FIG. 2. FIG. 3 is a side view of the front side frame as viewed from the inside of the vehicle body of the vehicle body front structure shown in FIG. 2. FIG. 3 is a side view of a front side frame showing a state where a lid member of the vehicle body front structure shown in FIG. 2 is removed. It is a perspective view of the stiffener of the vehicle body front part structure shown by FIG. FIG. 3 is a perspective view of the stiffener of the vehicle body front structure shown in FIG. 2 as viewed from the outside of the vehicle body.

  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 configuration 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 sub-frame 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 collar 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. 7, 11, and 12.
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 and 14, in the vehicle body front structure 10, the inner wall 43 (main body 26) of the rear frame portion 41 overlaps with the stiffener 46 and the lid member 27 in a side view and in front of the floor frame. Beads 68 and 69 directed to the portion 67 are formed.

  As shown in FIG. 15, the outer wall 44 (lid member 27) of the rear frame portion 41 is directed to the stiffener 46 and the inner wall 43 of the main body 26 in a side view and directed to the floor frame front portion 67. Beads 76 and 77 are formed.

  Further, as shown in FIGS. 16 to 18, the bead 104 is directed to the stiffener 46 so as to overlap the inner wall 43 of the main body 26 and the outer wall 44 of the lid member 27 in a side view and directed to the floor frame front portion 67. , 105 are formed.

  By providing these beads 68 and 69, beads 76 and 77, and beads 104 and 105 on the front side frame 17, the front collision load can be smoothly transmitted to the floor frame 25.

  As shown in FIG. 1 to FIG. 6 and FIG. 13 to FIG. 16, the vehicle body front structure 10 has a front side frame 17 having a rectangular cross section extending in the longitudinal direction of the vehicle body, And a dashboard lower panel 19 that partitions the engine room 29 and the vehicle compartment 28, and a floor frame 25 that extends from the rear side of the front side frame 17 to the rear of the vehicle body.

Since the front side frame 17 includes a main body 26 having a U-shaped cross section that opens outward and a front side frame main body 18 that includes a lid member 27 that closes the main body 26, the front side frame main body can be easily manufactured. Therefore, the mold cost can be reduced, the assemblability can be improved, and the accuracy can be improved.
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 portion 38. A stiffener 46 that is coupled to the rear end 48 and extends in the same straight line is incorporated, and the front end 47 of the stiffener 46 is provided behind the collar nut holding bracket 62 for mounting the engine mount. The load acting in the 18 axial direction can be smoothly transmitted to the floor frame 25, and the support strength of the engine 32 can be improved.

The floor frame 25 includes a floor frame front portion 67 along an inclined surface 19a inclined downward to the rear of the vehicle body of the dashboard lower panel 19.
Because the beads 68 and 69 are formed on the inner wall 43 of the rear frame portion 41 so as to overlap the stiffener 46 and the lid member 27 in a side view and directed to the floor frame front portion 67, the front impact load is applied to the floor frame. It can be transmitted smoothly.

  Since the stiffener 46 is made stronger than the front side frame body 18, it is possible to improve the transmission characteristics of the front impact load acting in the axial direction of the front side frame body.

  Since the front side frame 17 and the floor frame 25 are coupled via the adapter 22 and the rear end 51 of the stiffener 46 is coupled to the outer side portion 55 of the adapter 22, for example, the rear frame portion 41 of the front side frame main body 18 is Even if it is curved, it is possible to counteract the bending moment by generating a drag with the adapter 22 against the bending moment generated by the front impact load.

  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.

  In the vehicle body front structure according to the present invention, as shown in FIG. 5, the front end 47 of the stiffener 46 is provided behind the collar nut holding bracket 62 for mounting the engine mount. This does not prevent the stiffener 46 from extending further forward.

  The present invention is suitable for application to an automobile having a vehicle body front portion structure including a floor frame extending from the rear side of the front side frame to the rear of the vehicle body.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle body front part structure, 17 ... Front side frame, 18 ... Front side frame main body, 19 ... Dashboard lower panel, 19a ... Inclined surface, 22 ... Adapter, 23 ... Cross member, 25 ... Floor frame, 26 ... Main body, 27 ... lid member, 28 ... vehicle compartment, 29 ... engine room, 38 ... front frame part, 41 ... rear frame part, 43, 44 ... inner and outer walls, 46 ... stiffener, 47 ... front end of stiffener, 48 ... front part The rear end of the frame part, 51 ... the rear end of the stiffener, 55 ... the side wall (outer part), 56 ... the side wall (inner part), 62 ... the collar nut holding bracket (second bracket), 67 ... the front part of the floor frame, 68, 69 ... Bead, 71, 72 ... Upper and lower walls, 101 ... Stiffener body, 102, 103 ... Upper and lower flanges.

Claims (4)

Front side frames 16 and 17 having a rectangular cross section extending in the longitudinal direction of the vehicle body, and a dashboard lower panel 19 extending in the vehicle width direction and inclined downward to the rear of the vehicle body and partitioning the engine room 29 and the vehicle compartment 28. And a vehicle body front structure comprising floor frames 24 and 25 extending from the rear side of the front side frames 16 and 17 to the rear of the vehicle body,
The front side frames 16 and 17, the main body 26 by a U-shaped cross section body 26 with a welding flange 74 and 75 in the vertical as well as open outward and welded to the weld flange 74, 75 of the upper and lower According to a lid member 27 for closing the, with a front side frame body 18,
The front side frame body 18, the body-side vehicle body inward of the inner wall 43 and straight front frame portion 38, the rear frame portion 41 of the main body vehicle body inward of the inner wall 43 is curved from the outside to the inside And formed from
The rear frame portion 41 of the front side frame main body 18 and the floor frames 24 , 25 are coupled via an adapter 22 ,
The front frame portion 38, between the junction of the joint and a U-shaped main body 26 and the lid member 27 of the inner side wall 43 of the U-shaped cross section of the main body 26, the engine mount attachment comprising a partition portion 96 A collar nut holding bracket 62 for
The collar nut holding bracket 62 for mounting the engine mount is
An inner joint portion 95 to be joined to the inner wall 43 is formed,
The partition portion 96 is formed continuously to the inner joint portion 95,
The upper joining piece 97 is formed so as to be sandwiched and joined between the upper welding flange portion 74 and the lid member 27 in connection with the partition portion 96,
The lower joining piece 98 is formed so as to be sandwiched between and joined to the lower welding flange portion 75 and the lid member 27 in connection with the partition portion 96,
The collar nut holding bracket 62 is provided with a color nut 79 for mounting the engine mount,
Said rear frame portion 41 is combined with the rear end of the inner wall 43 of the front frame portion 38 incorporates a stiffener 46 extending in the same straight line as the inner wall 43 of the front portion frame 38, the front end of the stiffener 46 47 There is provided at the rear of the collar nut holding bracket 62 for the engine mount attachment, the rear end of the stiffener 46 bonded to the outer portion 55 of the adapter 22, the inner wall 43 of the rear frame portion 41 of the adapter 22 A vehicle body front structure characterized by being coupled to an inner portion 56 . The floor frames 24 , 25 are provided with a floor frame front portion 67 along an inclined surface 19a inclined downward to the rear of the vehicle body of the dashboard lower panel 19 ,
A bead ( 68 , 69) is formed on the inner side wall (43) of the rear frame part ( 41 ) so as to overlap the stiffener ( 46) and the lid member ( 27) in a side view and directed to the floor frame front part ( 67 ). The vehicle body front structure according to claim 1. The vehicle body front part structure according to claim 1 or 2, wherein the stiffener ( 46) is stronger than the front side frame body ( 18 ). The stiffener 46 has a U-shaped cross section in which 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 connected to the upper and lower walls 71 and 72 of the front side frame main body 18 . The vehicle body front part structure according to any one of claims 1 to 3, wherein the front body structure is combined.

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