JP6345079B2 - Front body structure of automobile - Google Patents

Description

  The present invention relates to a front body structure of an automobile in which suspension members are disposed below left and right side members.

  In the automobile, a structure is adopted in which the input at the time of a frontal collision of the vehicle is distributed from the side member to the rocker rail via the outrigger. Further, in order to suppress the rearward movement of the suspension member at the time of the collision, for example, Patent Document 1 discloses that the rear mounting portion of the subframe and the horizontal portion of the side member are substantially S-shaped in a side view having a fragile portion. A structure for connecting by stays is disclosed.

JP 2012-206653 A

  By the way, in the conventional structure, although it is possible to deal with an input in the front and rear of the vehicle, for example, when an input from the side in the vehicle width direction is applied to the suspension member during steering, an input in the rotational direction is input to the rear mounting portion. Acts, and there is a tendency that the side member moves so as to fall into the inside of the vehicle. This tilting increases the amount of displacement of the rear mounting portion of the suspension member, which may deteriorate steering stability such as a feeling of steering, return of steering, and linearity.

In order to suppress the displacement of the suspension member due to such an input during steering, it is conceivable to add a reinforcing member or the like. However, when a reinforcing member is newly added, there arises a problem that the number of parts and the weight of the vehicle body increase.

  The present invention has been made in view of the above-described conventional situation, and provides a front vehicle body structure of an automobile that can improve steering stability with respect to input from the lateral direction during steering without increasing the number of parts and the weight of the vehicle body. It is an issue.

According to the present invention, a rocker rail is disposed outside the left and right side members, and a front end portion of the rocker rail and the side member are connected by an outrigger, and a suspension is provided below the left and right side members. In the front body structure of an automobile in which a member is disposed and the left and right front end portions and the left and right rear end portions of the suspension member are connected to the side members.
A brace member is arranged to bridge between the left and right rear end portions of the suspension member and the left and right side members positioned behind the rear end portion, and the left and right brace members The front part is fixed to the left and right rear ends, and the rear part is fastened and fixed to the left and right side members.
Further, the left and right brace members are formed with extension portions extending so as to overlap the outriggers, and the extension portions are fastened and fixed to the outriggers.

  According to the front vehicle body structure of the present invention, the rear end portion of the suspension member and the side member behind the rear end portion are bridged by the brace member, and the front portion of the brace member is fixed to the rear end portion. The rear portion is fastened and fixed to the side member, and the brace member is formed with an extension portion that extends so as to overlap the outrigger, and the extension portion is fastened and fixed to the outrigger. When a rotational force acts on the rear end portion, the fixing portion of the extension portion is stretched to receive the rotational force, and the side member can be prevented from falling into the vehicle interior. Thereby, the displacement of the rear end portion of the suspension member can be suppressed, and as a result, steering stability can be improved.

Moreover, since the rigidity of the rear end portion of the suspension member can be increased by the brace member, it is possible to suppress vibration during traveling that acts on the rear end portion, and to improve the riding comfort.

  In the present invention, an extension part is formed on an existing brace member, and the extension part is fastened and fixed to the outrigger, so there is no need to add a new reinforcing member, and an increase in the number of parts and the weight of the vehicle body is avoided. it can.

It is a bottom view of the front vehicle body of the automobile according to Embodiment 1 of the present invention. It is a side view of the front vehicle body. It is a top view of the said front part vehicle body. It is sectional drawing (IV-IV sectional view taken on the line of FIG. 3) of the said front vehicle body. It is sectional drawing (VV sectional view taken on the line of FIG. 3) of the said front vehicle body. FIG. 4 is a cross-sectional view of the front vehicle body (a cross-sectional view taken along line VI-VI in FIG. 3).

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 6 are views for explaining a front body structure of an automobile according to Embodiment 1 of the present invention. In this embodiment, front, rear, left, and right mean front, rear, left, and right as viewed in the forward direction of the vehicle.

  In the figure, reference numeral 1 denotes a front vehicle body constituting an engine room of an automobile. The front vehicle body 1 includes left and right side members 2 and 2 that extend in the vehicle front-rear direction, and left and right rocker rails that are disposed outside the left and right side members 2 and extend in the vehicle front-rear direction. 3, 3, outriggers 4, 4 connecting the left and right rocker rails 3 and the side member 2, and a suspension member 5 disposed below the left and right side members 2.

  The left and right side members 2 include a front member portion 2a extending substantially linearly, a kick portion 2b extending obliquely rearward and downward following the front portion 2a, and a substantially straight shape rearward following the kick portion 2b. And a rear member portion 2c extending in the direction. A suspension tower 6 is coupled to the vehicle exterior side of the front member portion 2a. A dash panel for separating the engine room and the vehicle compartment is disposed at the kick portion 2b of the left and right side members 2.

  The left and right outriggers 4 have a hat shape that opens upward, and includes a bottom wall 4c, a front wall 4d that bends and extends upward following the front and rear edges of the bottom wall 4c, and the rear. It has a wall 4e, and front and rear flange portions 4f and 4f which are bent and formed following the front wall 4d and the rear wall 4e. A floor member (not shown) is joined to the front and rear flange portions 4f, whereby the outrigger 4 has a closed cross-section box shape.

  A rein hose 7 and a bulkhead 8 are disposed in the outrigger 4. The rein hose 7 has a bottom wall portion 7a that extends in the vehicle width direction and covers a rear portion of the bottom wall 4c of the outrigger 4, and a rear vertical wall portion 7b that covers a lower portion of the rear wall 4e. 4 is connected.

  The bulkhead 8 is disposed so as to extend in the front-rear direction on the bottom wall 4c of the outrigger 4, and has a generally hat-shaped cross section that opens downward (see FIG. 5). Inner and outer flange portions 8a and 8b of the outrigger 4 are coupled to the bottom wall 4c.

The inner flange portion 8 a of the bulkhead 8 is formed to extend so that a part 8 c thereof overlaps the bottom wall portion 7 a of the rein hose 7.

  The outer end 4 a of the outrigger 4 is coupled to the front end 3 a of the rocker rail 3, and the inner end 4 b is coupled to the lower part of the kick portion 2 b of the side member 2. Thereby, a part of the input at the time of a vehicle frontal collision is transmitted from the side member 2 to the rocker rail 3 via the outrigger 4.

  The suspension member 5 is disposed below a portion extending from the front member 2a of the side member 2 through the kick portion 2b to the substantially front end portion of the rear member portion 2c. A steering gear unit connected to a steering shaft (not shown) is attached to the suspension member 5.

The suspension member 5 has a structure in which the outer peripheral edge portions 5c are joined to each other by welding so that the upper member 5a and the lower member 5b are hollow.

The left and right front ends 5d and 5d of the suspension member 5 are welded to the lower portions 9a of the left and right connecting arms 9 and 9 extending in the vehicle vertical direction, and the upper ends 9b of the left and right connecting arms 9 are joined. Are fastened and fixed by bolts 10 to the bottom wall 2d of the front member 2a of the side member 2.

Further, in the left and right rear end portions 5e and 5e of the suspension member 5, a bush 12 having an elastic member 12c interposed between the inner cylinder 12a and the outer cylinder 12b is disposed. A lower arm 11 that supports a front wheel (not shown) is connected and fixed to the 12 outer cylinder 12b (see FIG. 4).

A connecting bolt 13 is inserted into the inner cylinder 12 a of the bush 12 from below so as to penetrate the suspension member 5, and the connecting bolt 13 is coupled to the bottom wall lower surface 2 b ′ of the kick portion 2 b of the side member 2. Further, it is fastened and fixed to a substantially L-shaped bracket 14.

Between the left and right rear end portions 5e of the suspension member 5 and the kick portions 2b of the left and right side members 2 located behind the left and right rear end portions 5e, the both 5e and 2b are connected. Bracing members 16 and 16 for bridging are disposed.

The left and right brace members 16 are made of sheet metal, and have a structure in which a flange portion 16b protruding upward is formed by bending an outer edge portion of a substantially flat plate-like brace body 16a.

The brace body 16a includes a front mounting portion 16c that contacts the lower surface of the lower member 5b of the suspension member 5, a deformation inclined portion 16d that bends and extends upward from the front mounting portion 16c, and a deformation inclined portion 16d. Subsequently, it has a rear mounting portion 16e that abuts against the bottom wall lower surface 2b 'of the kick portion 2b. The deformation inclined portion 16d functions as a fragile portion that causes the suspension member 5 to fall off the side member 2 by being bent and deformed by a load at the time of a vehicle front collision.

The front mounting portions 16c of the left and right brace members 16 are fastened to the bracket 14 of the kick portion 2b together with the suspension member 5 by the connecting bolts 13, and are further fixed by welding. The rear mounting portion 16e is fastened and fixed to the bottom wall portion 2d of the kick portion 2b by fastening bolts 18 inserted from below.

The brace body 16a of the left and right brace members 16 is integrally formed with extensions 16f and 16f extending so as to overlap the outrigger 4.

The extension portion 16f extends inward in the vehicle width direction following the rear attachment portion 16e, and faces the overlapping portion of the part 8c of the bulkhead 8 of the outrigger 4 and the bottom wall portion 7a of the rein hose 7. An extension is formed.

The extension portion 16e is fastened and fixed integrally with the bottom wall 4c of the outrigger 4, the bottom wall portion 7a of the reinhose 7 and the part 8c of the bulkhead 8 by fastening bolts 19 inserted from below. .

The brace body 16a is formed with a reinforcing bead 16g so as to be positioned substantially on a line connecting the connecting bolt 13 of the front mounting portion 16c and the fastening bolt 19 of the extension portion 16e (see FIG. 3). This increases the rigidity of the brace member 16 with respect to the input in the vehicle width direction.

According to the present embodiment, the brace member that bridges the left and right rear end portions 5e of the suspension member 5 and the kick portion 2b of the side member 2 located behind the rear end portion 5e. 16, the front mounting portion 16 c of the brace member 16 is fastened and fixed to the rear end portion 5 e of the suspension member 5 by the connecting bolt 13, and the rear mounting portion 16 e is fastened and fixed to the kick portion 2 b by the fastening bolt 18. Further, an extension portion 16f extending so as to overlap the outrigger 4 is formed subsequent to the rear mounting portion 16e of the brace member 10, and the extension portion 16f is overlapped with the outrigger 4, the reinhose 7 and the bulkhead 8 by a fastening bolt 19 to be integrated. Fastened and fixed.

With this configuration, as shown in FIG. 1, when the rotational force F1 acts on the rear end portion 5e of the suspension member 5 from the input F in the vehicle width direction during steering, the rotational force F1 is applied to the rear end portion 5e. It will be received by the pulling force F2 acting in the direction opposite to the rotational direction between the connecting bolt 13 and the fastening bolt 19 of the extension portion 16f, and the side member 2 can be prevented from falling into the vehicle interior. As a result, deformation of the rear end portion 5e of the suspension member 5 can be suppressed, and as a result, steering stability in a low speed range, steering return, linearity, and other steering stability can be improved.

Further, since the flange portion 16b is formed on the brace member 16 and the reinforcing bead 16g extending in the vehicle width direction is formed, the rigidity of the brace member 16 itself, and hence the rigidity of the suspension member 5 with respect to the input F in the vehicle width direction is greatly increased. From this point, the side member 2 can be prevented from falling.

Further, since the rigidity of the rear end portion 5e of the suspension member 5 can be increased by the brace member 16, it is possible to suppress the vibration during traveling that acts on the rear end portion 5e and to improve the ride comfort.

  In the present embodiment, the extension part 16e is formed on the existing brace member 16, and the extension part 16e is fastened and fixed to the outrigger 4, so there is no need to add a new reinforcing member, and the number of parts and the weight of the vehicle body Can be avoided.

  Further, since the rein hose 7 and the bulkhead 8 are disposed on the outrigger 4, the rigidity of the outrigger 4 itself can be greatly improved, and the performance at the time of frontal collision and steering can be further enhanced.

DESCRIPTION OF SYMBOLS 1 Front vehicle body 2 Side member 3 Rocker rail 3a Front end part 4 Outrigger 5 Suspension member 5d Front end part 5e Rear end part 16 Brace member 16c Front attachment part (front part)
16e Rear mounting part (rear part)
16f extension

Claims (1)

A rocker rail is disposed outside the left and right side members, and a front end of the rocker rail and the side member are connected by an outrigger, and a suspension member is disposed below the left and right side members. In the front body structure of an automobile in which the left and right front end portions and the left and right rear end portions of the suspension member are connected to the side members,
A brace member is arranged to bridge between the left and right rear end portions of the suspension member and the left and right side members positioned behind the rear end portion, and the left and right brace members The front part is fixed to the left and right rear ends, and the rear part is fastened and fixed to the left and right side members.
Further, the left and right brace members are formed with extension portions extending so as to overlap the outriggers, and the extension portions are fastened and fixed to the outriggers.

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