JP5063287B2 - Body front structure - Google Patents

Description

  The present invention relates to a vehicle body front portion structure including a front subframe below right and left front side frames.

Some vehicle body structures are known in which a reinforcing plate is arranged from the rear suspension arm to the front floor panel and side sill, and this reinforcing plate is attached to a rigid structure (front floor panel, side sill and tunnel member) ( For example, see Patent Document 1.)
JP 2006-213204 A

According to this vehicle body structure, when an impact load is applied from the rear to the front of the vehicle body, the impact load can be supported by the reinforcing plate attached to the highly rigid structure.
Thereby, the displacement of the rear suspension arm can be suppressed, and the amount of change in the alignment with respect to the rear suspension (the attachment angle of the tire with respect to the vehicle body) can be suppressed.

By the way, in the vehicle body front structure constituting the front part of the vehicle body structure, the front side frame rear end extends from the rear end portion of the left and right front side frames toward the rear of the vehicle body, and the left and right front side frames and Some have a front subframe below the rear end of the front side frame.
It is conceivable to secure the rigidity of the vehicle body front structure by applying the reinforcing plate of Patent Document 1 to the vehicle body front structure.

Here, when an impact load acts rearward from the front of the vehicle body, the impact load is transmitted to the rear of the vehicle body via the left and right front side frames and the front subframe.
On the other hand, the reinforcing plate of Patent Document 1 secures the rigidity of the reinforcing plate by being attached to a highly rigid structure (front floor panel, side sill or tunnel member).

However, the side sills and tunnel members, which are highly rigid structures, are arranged at positions offset from the left and right front side frames and the left and right side frames.
For this reason, when an impact load is applied from the front to the rear of the vehicle body, it is difficult to efficiently support the applied impact load with the reinforcing plate.

  An object of the present invention is to provide a vehicle body front part structure that can efficiently absorb an applied impact load when an impact load is applied rearward from the front part of the vehicle body.

In the invention according to claim 1, the rear frame extends from the rear end portion of the front side frame toward the rear of the vehicle body, the outrigger extends from the rear end portion of the front side frame toward the outer side in the vehicle body width direction, and the outrigger from the side sill is extended toward the rear of the vehicle body, the vehicle body front structure fastening portion of the front and rear is attached from the bottom of the vehicle body each of said front side frames and CFCs preparative sub frame to the rear frame, the front sub-frame By attaching the rear fastening part to the rear frame, the rear fastening part is arranged at the same height with respect to the attachment part of the rear frame and the attachment part of the side sill provided behind the rear fastening part. The rear fastening portion faces the front end portion of the front end of the mounting portion of the rear frame. Rutotomoni, wherein a vehicle body front structure provided so as to face the front end with the front end of the mounting portion of the side sill, the fastening portion after the front subframe, mounting of the mounting portion and the side sill of the rear frame mounted from the bottom of the vehicle body to the site, the the rear frame is superimposed from the bottom of the vehicle body, a first arm connecting the mounting portion of the fastening portion and said rear frame after said front subframe, the bottom of the vehicle body to the outrigger A second arm that connects the rear fastening portion of the front subframe and the attachment portion of the side sill , and a third arm that connects the attachment portion of the side sill and the attachment portion of the rear frame. A load transmitting member formed on the frame, and acting on the load transmitting member from the front of the vehicle body. With important impact load to the rear frame via the first arm from the fastening part after the front subframe, characterized in that transmitted to the side sill via the second arm.

  The invention according to claim 2, wherein the load transmitting member is configured such that two of the top portions attached to the rear fastening portion of the front subframe, the rear frame, and the side sill act on the front subframe. It is arranged on the input virtual line of the impact load.

  In the invention according to claim 3, the load transmission member is characterized in that the first arm is disposed along the rear frame and the second arm is disposed along the outrigger.

Here, in the normal vehicle body front structure, when an impact load is applied from the front of the vehicle body toward the rear, the applied impact load is transmitted to the rear of the vehicle body via the rear frame serving as a transmission path and becomes a transmission path. It is configured to be transmitted to the rear of the vehicle body via the outrigger.
Therefore, in claim 3, the first arm is disposed along the rear frame, and the second arm is disposed along the outrigger.

  In the invention according to claim 1, a substantially triangular frame is used as the load transmission member. Then, the rear fastening portion and the rear frame of the front subframe were connected by the first arm, and the rear fastening portion and the side sill of the front subframe were connected by the second arm.

When an impact load is applied from the front of the vehicle body to the rear, the applied impact load can be distributed to the first arm and the second arm.
The impact load distributed to the first arm can be transmitted to the rear frame, and the impact load distributed to the second arm can be transmitted to the side sill.

Here, the lower end portion of the front pillar is attached to the intersection between the front end portion of the side sill and the outrigger.
By connecting the rear fastening portion of the front subframe and the side sill with the second arm among the load transmitting members of the substantially triangular frame, the intersection between the front end portion of the side sill and the outrigger can be reinforced.
Thereby, the rigidity of the front pillar base attached to the intersection of the front end of the side sill and the outrigger can be increased.

The rear fastening portion of the front subframe was connected to the rear frame via the first arm, and was connected to the side sill via the second arm.
Therefore, when an impact load is applied from the front of the vehicle body toward the rear, it is possible to prevent the rear fastening portion of the front subframe from being displaced toward the rear of the vehicle body due to the applied impact load.
In this way, by suppressing the displacement of the rear fastening portion of the front subframe, it is possible to suppress the amount of change in the alignment with respect to the front suspension (the mounting angle of the tire with respect to the vehicle body).
Further, in the invention according to claim 1, the rear fastening portion is disposed at the same height with respect to the rear frame mounting portion and the side sill mounting portion provided at the rear of the vehicle body from the rear fastening portion of the front subframe , and the rear fastening. The portion was opposed to the front end portion of the attachment portion of the rear frame and was opposed to the front end portion of the attachment portion of the side sill.
As a result, in the unlikely event that the fastening state of the rear fastening portion is released due to the impact load acting from the front of the vehicle body toward the rear, the rear fastening portion is pressed against the side sill or the rear frame mounting site, and the impact load is applied. Can support.

In the invention which concerns on Claim 2, the two top parts of the load transmission member were arrange | positioned on the input virtual line of the impact load which acted on the front sub-frame.
Thereby, the impact load applied to the front sub-frame can be transmitted more efficiently to the rear of the vehicle body via the load transmission member.
Here, the input imaginary line of the impact load refers to an imaginary line in which the impact load applied to the front part of the vehicle body acts toward the rear of the vehicle body.

In the invention which concerns on Claim 3, the cross-sectional area used as the transmission path | route of an impact load can be made into the cross-sectional area of both members of a rear frame and a 1st arm by arrange | positioning a 1st arm along a rear part frame. .
Further, by disposing the second arm along the outrigger, the cross-sectional area serving as an impact load transmission path can be set to the cross-sectional area of both the outrigger and the second arm member.
Thereby, it is possible to ensure a large cross-sectional area as a transmission path for the impact load, and to transmit the impact load more efficiently.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, and “right” indicate the direction viewed from the driver, the front side is Fr, the rear side is Rr, the left side is L, and the right side is R.

FIG. 1 is a diagram showing a state in which a vehicle body front structure according to the present invention is viewed from the bottom surface side, and FIG. 2 is an exploded view showing a state in which the vehicle body front structure according to the present invention is viewed from the bottom surface side.
The vehicle body front structure 10 extends from the left and right front side frames 11 and 12 disposed in the longitudinal direction of the vehicle body and from the rear end portions 11a and 12a of the left and right front side frames 11 and 12 toward the rear of the vehicle body. Left and right rear frames 13, 14; left and right outriggers 15, 16 projecting outward from the rear end portions 11a, 12a of the left and right front side frames 11, 12 toward the vehicle body width direction; and left and right outriggers The left and right side sills 17 and 18 respectively extend toward the rear of the vehicle body from 15 and 16, and the front floor panel 19 attached between the left and right side sills 17 and 18.

  The left rear frame 13 includes a left front side frame rear end 21 extending toward the rear of the vehicle body from the rear end portion 11a of the left front side frame 11, and a rear end portion 21a of the left front side frame rear end 21 toward the rear of the vehicle body. And a left floor frame 22 extending respectively.

  The right rear frame 14 includes a right front side frame rear end 24 that extends from the rear end 12a of the right front side frame 12 toward the rear of the vehicle body, and a rear end 24a of the right front side frame rear end 24 that extends toward the rear of the vehicle body. And a right floor frame 25 respectively extending.

  Further, the vehicle body front structure 10 includes a front subframe 30 attached to the left and right front side frames 11 and 12 and the left and right front side frames rear ends 21 and 24, and a left rear fastening portion (rear fastening portion) of the front subframe 30. ) 31 is connected to the left front side frame rear end 21 and the left side sill 17, and a left load transmission member (load transmission member) 35 and a right rear fastening portion (rear fastening portion) 32 of the front subframe 30 are connected to the right front side frame rear end 24. And a right load transmission member (load transmission member) 36 connected to the right side sill 18.

The left front side frame rear end 21 extends from the rear end portion 11a of the left front side frame 11 toward the rear of the vehicle body, and the left floor frame 22 extends from the rear end portion 21a of the left front side frame rear end 21 toward the rear of the vehicle body. It has been extended.
Therefore, the left front side frame 11, the left front side frame rear end 21, and the left floor frame 22 are attached in a substantially linear shape.

The right front side frame rear end 24 extends from the rear end portion 12a of the right front side frame 12 toward the rear of the vehicle body, and the right floor frame 25 extends from the rear end portion 24a of the right front side frame rear end 24 toward the rear of the vehicle body. It has been extended.
Therefore, the right front side frame 12, the right front side frame rear end 24, and the right floor frame 25 are attached in a substantially linear shape.

A left outrigger 15 projects from the rear end portion 11a of the left front side frame 11 outward in the vehicle width direction, and a left side sill 17 extends from the end portion 15a of the left outrigger 15 toward the rear of the vehicle body.
Therefore, the left side sill 17 is disposed substantially parallel to the left front side frame rear end 21 and the left floor frame 22 with a predetermined distance L.

A right outrigger 16 projects from the rear end portion 12a of the right front side frame 12 outward in the vehicle width direction, and a right side sill 18 extends from the end portion 16a of the right outrigger 16 toward the rear of the vehicle body.
Therefore, the right side sill 18 is disposed substantially parallel to the right front side frame rear end 24 and the right floor frame 25 with a predetermined distance L.

The front sub-frame 30 is disposed between the left and right sub-side frames 41 and 42 disposed in the longitudinal direction of the vehicle body and the left and right sub-side frames 41 and 42, and is attached to the front end portions 41a and 42a. A cross member 43 and a rear cross member 44 disposed between the left and right sub-side frames 41 and 42 and attached to the respective rear end portions 41b and 42b are provided.
The front subframe 30 is formed in a substantially rectangular frame body by left and right subside frames 41 and 42 and front and rear cross members 43 and 44.

The left sub-side frame 41 is formed in a gently curved shape along the left front side frame 11.
The left sub-side frame 41 is attached with a left front fastening portion (front fastening portion) 33 attached to the front end portion 11 b of the left front side frame 11 with a bolt 46 and a bolt 47 near the front end portion 21 b of the left front side frame rear end 21. The left rear fastening part 31 is provided.

The right sub-side frame 42 is formed in a gently curved shape along the right front side frame 12.
The right sub-side frame 42 is attached by a bolt 49 near the front end 24b of the right front side frame rear end 24 and a right front fastening portion (front fastening portion) 34 attached to the front end 12b of the right front side frame 12 by a bolt 48. And a right rear fastening portion 32.

  The left load transmission member 35 is formed in a substantially triangular frame, and a front top portion (top portion) 51 is attached to the left rear fastening portion 31 of the left sub-side frame 41 with a bolt 47, and a left attachment portion of the left front side frame rear end 21. An inner top part (top part) 53 is attached to the (attachment part) 52 with a bolt 54, and an outer top part (top part) 57 is attached to the left attachment part (attachment part) 56 of the left side sill 17 with a bolt 58.

  The right load transmission member 36 is formed in a substantially triangular frame, and a front top portion (top portion) 61 is attached to the right rear fastening portion 32 of the right sub-side frame 42 with a bolt 49, and a right attachment portion of the right front side frame rear end 24 is attached. An inner top portion (top portion) 63 is attached to 62 with a bolt 64, and an outer top portion (top portion) 67 is attached to a right attachment portion 66 of the right side sill 18 with a bolt 68.

  Since the left and right load transmitting members 35 and 36 are symmetrical members, the left load transmitting member 35 will be described below and the description of the right load transmitting member 36 will be omitted.

FIG. 3 is a perspective view showing a state in which the left load transmitting member of the vehicle body front structure according to the present invention is viewed from the bottom surface side.
A base 72 a of the left front pillar 72 is attached to an intersection 71 (see also FIG. 2) between the front end 17 a of the left side sill 17 and the left outrigger 15.
A dashboard lower 73 is attached along the left front pillar 72.

A left attachment portion 56 is provided at the front end portion 17 a of the left side sill 17. Further, a left attachment portion 52 is provided at the rear end portion 21 a of the left front side frame rear end 21.
The left load transmission member 35 is attached to the left attachment portion 56 of the left side sill 17, the left attachment portion 52 of the left front side frame rear end 21, and the left rear fastening portion 31 of the left sub-side frame 41 with bolts 47, 54, 58. Yes.

  The left load transmitting member 35 includes first to third arms 75 to 77 that form a substantially triangular frame, a front top 51 to which the first and second arms 75 and 76 are connected, and first and third arms. The inner top portion 53 to which the arms 75 and 77 are connected, and the outer top portion 57 to which the second and third arms 76 and 77 are connected.

The front top 51 is formed with a mounting hole 51a shown in FIG. 2, and is attached to the left rear fastening portion 31 of the left sub-side frame 41 with a bolt 47 inserted into the mounting hole 51a.
The bolt 47 is a fastening member that fastens the front top 51 and the left rear fastening part 31 of the front subframe 30 together in the vicinity of the front end 21 b of the left front side frame rear end 21.

The inner top portion 53 is formed with a mounting hole 53a shown in FIG. 2, and is attached to the left mounting portion 52 of the left front side frame rear end 21 with a bolt 54 inserted into the mounting hole 53a.
The outer top 57 is formed with a mounting hole 57a shown in FIG. 2, and is attached to the left mounting portion 56 of the left side sill 17 with a bolt 58 inserted into the mounting hole 57a.

The front side top part 51 and the inner side top part 53 are arrange | positioned on the input virtual line 80 (refer also FIG. 1) of an impact load.
As shown in FIG. 1, the impact load input virtual line 80 is a virtual line on which the impact load F applied to the left sub-side frame 41 of the front sub-frame 30 acts toward the rear of the vehicle body.

The first arm 75 is a member that connects the left rear fastening portion 31 of the left sub-side frame 41 and the left attachment portion 52 of the left front side frame rear end 21.
The first arm 75 is disposed along the left front side frame rear end 21.
The reason why the first arm 75 is arranged along the left front side frame rear end 21 will be described later.

The second arm 76 is a member that connects the left rear fastening portion 31 of the front subframe 30 and the left attachment portion 56 of the left side sill 17.
By connecting the left rear fastening portion 31 of the left sub-side frame 41 and the left mounting portion 56 of the left side sill 17 with the second arm 76, the intersection 71 between the front end portion 17a of the left side sill 17 and the left outrigger 15 is reinforced. be able to.
Thereby, the rigidity of the base part 72a of the left front pillar 72 attached to the crossing part 71 of the front end part 17a of the left side sill 17 and the left outrigger 15 can be increased (secured).

  The second arm 76 is disposed along the left outrigger 15 (see also FIG. 1). The reason why the second arm 76 is disposed along the left outrigger 15 will be described later.

  The third arm 77 is a member that connects the left attachment portion 56 of the left side sill 17 and the left attachment portion 52 of the left front side frame rear end 21.

  As described above, the first arm 75 is disposed along the left front side frame rear end 21 and the second arm 76 is disposed along the left outrigger 15, so that an impact load is applied rearward from the front of the vehicle body. When acted, the impact load that acted can be distributed to the first arm 75 and the second arm 76.

The impact load distributed to the first arm 75 can be transmitted to the left front side frame rear end 21 by connecting the first arm 75 to the left attachment portion 52 of the left front side frame rear end 21.
Further, by connecting the second arm 76 to the left mounting portion 56 of the left side sill 17, it is possible to transmit the impact load distributed to the second arm 76 to the left side sill 17.

As described above, by disposing the first arm 75 along the left front side frame rear end 21, the cross-sectional area serving as an impact load transmission path can be reduced between the left front side frame rear end 21 and the first arm 75. It can be a cross-sectional area.
Thereby, it is possible to ensure a large cross-sectional area as a transmission path for the impact load, and to transmit the impact load more efficiently.

Furthermore, as described above, by arranging the second arm 76 along the left outrigger 15, the cross-sectional area serving as the transmission path for the impact load is set as the cross-sectional area of both the left outrigger 15 and the second arm 76. be able to.
Thereby, it is possible to ensure a large cross-sectional area as a transmission path for the impact load, and to transmit the impact load more efficiently.

In addition, as described above, the left rear fastening portion 31 of the left sub-side frame 41 is connected to the left front side frame rear end 21 via the first arm 75 and to the left side sill 17 via the second arm 76. It is connected.
Thereby, when an impact load is applied from the front of the vehicle body toward the rear, it is possible to prevent the left rear fastening portion 31 of the left sub-side frame 41 from being displaced toward the rear of the vehicle body due to the applied impact load.

4 is a sectional view showing a state in which the left load transmission member according to the present invention is broken along the first arm, and FIG. 5 is a sectional view showing a state in which the left load transmission member according to the present invention is broken along the third arm. FIG.
In the left sub-side frame 41, the left rear fastening portion 31 is disposed at the same height with respect to the left mounting portion 52 of the left front side frame rear end 21 and at the same height with respect to the left mounting portion 56 of the left side sill 17. Is arranged.

  That is, the attachment surface 31a of the left rear fastening portion 31 of the left sub-side frame 41, the attachment surface 52a of the left attachment portion 52 of the left front side frame rear end 21, and the attachment surface 56a of the left attachment portion 56 of the left side sill 17 are respectively It is formed substantially flush.

The attachment surface 31 a of the left rear fastening portion 31 of the left sub-side frame 41 is a surface to which the front top 51 of the left load transmission member 35 is attached.
The attachment surface 52 a of the left attachment portion 52 of the left front side frame rear end 21 is a surface to which the inner top portion 53 of the left load transmission member 35 is attached.
The attachment surface 56 a of the left attachment portion 56 of the left side sill 17 is a surface to which the outer top portion 57 of the left load transmission member 35 is attached.

By arranging the left rear fastening portion 31 of the left sub-side frame 41 at the same height with respect to the left attachment portion 52 of the left front side frame rear end 21, the left rear fastening portion 31 is placed at the front end portion 52b of the left attachment portion 52. (See FIG. 4).
Further, the left rear fastening portion 31 of the left sub-side frame 41 is disposed at the same height with respect to the left attachment portion 56 of the left side sill 17, so that the left rear fastening portion 31 is moved to the front end portion 56 b ( (See FIG. 3).

  The reason why the left rear fastening portion 31 is opposed to the front end portion 52b of the left attachment portion 52 and the front rear portion 56b of the left attachment portion 56 will be described in detail with reference to FIG.

Next, an example in which an impact load acts on the vehicle body front structure 10 will be described with reference to FIG.
FIGS. 6A and 6B are views for explaining a state in which an impact load is applied to the vehicle body front structure according to the present invention.
In (a), when the impact load F is applied from the front of the vehicle body to the rear, the applied impact load F can be distributed to the first arm 75 and the second arm 76.
The impact load distributed to the first arm 75 can be transmitted to the left front side frame rear end 21, and the impact load F distributed to the second arm 76 can be transmitted to the left side sill 17.

Here, the front top 51 and the inner top 53 of the left load transmission member 35 are disposed on the input virtual line 80 of the impact load F that has acted on the left sub-side frame 41.
Thereby, the impact load F applied to the left sub-side frame 41 can be efficiently transmitted to the rear of the vehicle body via the first arm 75 of the left load transmission member 35.

Further, since the left rear fastening portion 31 of the left sub-side frame 41 is connected to the left front side frame rear end 21 via the first arm 75 and also connected to the left side sill 17 via the second arm 76, the applied impact It is possible to prevent the left rear fastening portion 31 of the left sub-side frame 41 from being displaced toward the rear of the vehicle body due to the load.
In this way, by suppressing the displacement of the left rear fastening portion 31 of the left sub-side frame 41 (so-called tilting of the front sub-frame 30), the alignment of the front suspension (not shown) (the mounting angle of the tire with respect to the vehicle body) is reduced. The amount of change can be suppressed.

In addition, by suppressing the fall of the sub-side frame 30, it is not necessary to separately provide a stay for preventing the fall of the sub-side frame 30, which is necessary for the conventional vehicle body front structure.
Thereby, the number of parts can be reduced and the weight reduction of the vehicle body front part structure 10 can be achieved.

  In (b), the left rear fastening portion 31 is opposed to the front end portion 52b of the left attachment portion 52 of the left front side frame rear end 21, and is opposed to the front end portion 56b (see FIG. 3) of the left attachment portion 56 of the left side sill 17. I am letting.

Therefore, in the unlikely event that the fastening state of the left rear fastening portion 31 is released due to the impact load F acting from the front of the vehicle body to the rear, the left rear fastening portion 31 is attached to the left front side frame rear end 21 at the left. It is pressed against the front end portion 52 b of the portion 52 and the front end portion 56 b of the left attachment portion 56 of the left side sill 17.
Thereby, the impact load F can be supported by the front end portion 52b of the left mounting portion 52 of the left front side frame rear end 21 and the front end portion 56b of the left mounting portion 56 of the left side sill 17.

  In the above embodiment, the example in which the left and right load transmitting members 35 and 36 are formed in a substantially triangular frame by one member has been described. However, the present invention is not limited to this, and the first to third arms 75 to 77 are provided. The same effect can be obtained by forming individual members and combining the individual first to third arms into a substantially triangular frame.

  The vehicle body front structure of the present invention is suitable for application to an automobile having a front subframe below the left and right front side frames.

It is a figure which shows the state which looked at the vehicle body front part structure which concerns on this invention from the bottom face side. It is an exploded view which shows the state which looked at the vehicle body front part structure which concerns on this invention from the bottom face side. It is a perspective view which shows the state which looked at the left load transmission member of the vehicle body front part structure concerning this invention from the bottom face side. It is sectional drawing which shows the state fractured | ruptured along the 1st arm of the left load transmission member which concerns on this invention. It is sectional drawing which shows the state fractured | ruptured along the 3rd arm of the left load transmission member which concerns on this invention. It is a figure explaining the state which the impact load acted on the vehicle body front part structure which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Vehicle body front part structure, 11 ... Left front side frame (front side frame), 11a, 12a ... Rear end part, 12 ... Right front side frame (front side frame), 13 ... Left rear frame (rear frame), 14 ... right rear frame (rear frame), 15 ... left outrigger (outrigger), 16 ... right outrigger (outrigger), 17 ... left side sill (side sill), 18 ... right side sill (side sill), 30 ... front subframe, 31 ... left Rear fastening part (rear fastening part), 32 ... Right rear fastening part (rear fastening part), 33 ... Left front fastening part (front fastening part), 34 ... Right front fastening part (front fastening part), 35 ... Left load transmission member ( Load transmission member), 36 ... right load transmission member (load transmission member), 51 ... front top (top), 52 ... left attachment site (attachment site) , 52b ... Front end portion of left mounting portion , 53 ... inner top portion (top portion), 56 ... left mounting portion (mounting portion) , 56b ... front end portion of left mounting portion , 57 ... outer top portion (top portion), 75 ... first arm, 76 ... Second arm, 77 ... third arm, 80 ... input imaginary line, F ... impact load.

Claims (3)

The rear frame extends from the rear end portion of the front side frame toward the rear of the vehicle body, the outrigger extends from the rear end portion of the front side frame toward the outside in the vehicle width direction, and the side sill extends from the outrigger toward the rear of the vehicle body. extending, in the vehicle body front structure fastening portion of the front and rear is attached from the bottom of the vehicle body each of said front side frames and CFCs preparative sub frame to the rear frame,
By attaching the rear fastening portion of the front subframe to the rear frame, the rear fastening portion is the same as the mounting portion of the rear frame and the mounting portion of the side sill provided at the rear of the vehicle body from the rear fastening portion. Placed at the height,
The rear fastening portion is a vehicle body front structure provided so as to face a front end portion at a front end of an attachment portion of the rear frame and to face a front end portion at a front end of the attachment portion of the side sill,
Fastening portion after the front subframe, mounted from below the vehicle body mounting section of the mounting portion and the side sill of the rear frame,
A first arm that is superimposed on the rear frame from below the vehicle body, and connects a rear fastening portion of the front subframe and a mounting portion of the rear frame;
A second arm that is superimposed on the outrigger from below the vehicle body and connects a rear fastening portion of the front subframe and an attachment site of the side sill;
A third arm for connecting the mounting portion of the mounting portion and the rear frame of the side sill, in comprising a load transmitting member which is formed in a substantially triangular frame,
The load transmitting member transmits an impact load applied from the front of the vehicle body from the rear fastening portion of the front subframe to the rear frame via the first arm and to the side sill via the second arm. Car body front structure. The load transmitting member is
Of the three top portions attached to the rear fastening portion of the front subframe, the rear frame and the side sill, two top portions are arranged on an input virtual line of an impact load acting on the front subframe, The vehicle body front structure according to claim 1. The load transmitting member is
The first arm is disposed along the rear frame;
The vehicle body front structure according to claim 1, wherein the second arm is disposed along the outrigger.

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