JP2958091B2 - Vehicle front structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle body front structure in which a front bumper is mounted to be offset above a front frame.

[Related Art] Conventionally, as a vehicle body front structure, a vehicle in which a front bumper is mounted to be offset above a frame member (front frame) extending in the vehicle front-rear direction,
Generally well known. That is, for example, in a truck-based vehicle, the left and right front frames extending in the vehicle front-rear direction on both left and right sides in the engine room due to layout restrictions in the engine room, etc. Also, when the front bumper is mounted on the front frame, there is a case where the bumper must be mounted in a state of being offset above the front frame.

In such a case, the front bumper is generally mounted at a position above and in front of the front end of the front frame via a mounting member such as a bumper stay.

[Problem to be Solved by the Invention] However, in such a structure, as shown in, for example, FIG.
The front bumper 55 presses the front end side downward from the bumper 55 side before the collision load is input in the axial direction because the front bumper 55 located at the front upper side collides with the collision target W ′ first. Direction bending moment. The front frame 51 is bent relatively easily downward in the vicinity of the front portion thereof, particularly in the vicinity of the mounting portion of the bumper stay 54 to the frame 51 (that is, the mounting portion of the stay bracket 56 in FIG. 8). Therefore, it is conceivable that the proof stress is reduced and the entire amount of deformation is consumed before the impact energy is sufficiently absorbed.

For this reason, the initial G of the vehicle at the time of the collision significantly decreases, and it is preferable to improve the performance in order to effectively restrain the occupant by using the seat belt in the initial stage of the collision.

The present invention has been made in view of the above problems, and in a vehicle in which a front bumper is mounted to be offset above a front frame, bending deformation of the front frame in the initial stage of a vehicle collision is suppressed, and the initial G is reduced. It is an object of the present invention to provide a front vehicle body structure of a vehicle capable of preventing the occurrence of a vehicle.

[Means for Solving the Problems] Accordingly, a first invention of the present application is directed to a vehicle body front structure including a front bumper mounted to be offset above a frame member extending in the vehicle longitudinal direction. An extension member extending toward the front of the vehicle body is disposed on the front side of the frame member, and a front end surface of the extension member is set to be located behind the front end surface of the front bumper by a predetermined amount, A vehicle towing member extending toward the front of the vehicle body is attached to the lower surface of the frame member so as to be offset downward, and the front end of the vehicle towing member is set to be located forward of the front end surface of the frame member. It is something that has been done.

Further, according to a second invention of the present application, in the first invention, a shroud member that supports an engine room front wall is disposed in front of the frame member, and the extension member is fixed to a front side of the shroud member. A front extension member and a rear extension member fixed to the rear side of the shroud member or the front end of the frame member.

Further, according to a third invention of the present application, in the first invention, the extension member is provided with a groove capable of absorbing a shock in a vehicle longitudinal direction.

[Effects of the Invention] According to the first invention of the present application, an extension member extending toward the front of the vehicle body is provided on the front side of the frame member, and the extension member has a front end face whose front end is the front end of the front bumper. The extension member collides immediately after a collision load is input to the front bumper at the time of a vehicle frontal collision,
An axial load is input to the frame member at an early stage via the extension member. A vehicle towing member extending toward the front of the vehicle body is mounted on the lower surface of the frame member so as to be offset downward, and a front end of the vehicle towing member is positioned forward of the front end surface of the frame member. Therefore, at the time of a vehicle frontal collision, the vehicle towing member also receives a collision load before the frame member, and further, applies a load to the frame member in a direction opposite to the input load via the front bumper. Since the transmission can be performed, the upward bending of the frame member can be effectively suppressed.

That is, the bending deformation of the front frame in the early stage of the vehicle collision can be suppressed, and the decrease in the initial G can be effectively prevented. As a result, the occupant can be effectively restrained by operating the seat belt in the initial stage of the collision, and safety can be improved.

Further, according to the second invention of the present application, basically the same effects as those of the first invention can be obtained. In particular, the front and rear extension members collide immediately after the front bumper collides with the collision object when the vehicle has a frontal collision, and the front extension members collide with the front extension member. Then, the front extension member comes into contact with the rear extension member, and an axial load is input to the frame member via both extension members. That is, the frame member receives an axial load before being largely bent in the vertical direction by a bending moment caused by the load from the bumper, so that the bending deformation in the initial stage of the collision is suppressed and the impact energy is effectively absorbed. And can be deformed.

Further, according to the third aspect of the present invention, basically the same effects as those of the first aspect can be obtained. In particular, since the extension member is provided with the groove, it is possible to more effectively absorb an impact load input to the frame member in the front-rear direction of the vehicle body in the event of a frontal collision of the vehicle.

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

FIG. 1 and FIG. 2 are a plan view and a side view schematically showing a frame structure of a vehicle body front part of a vehicle (truck) according to the present embodiment. A front frame 1 extending in the vehicle longitudinal direction on both left and right sides in the engine room ER, and a front end cross member 2 connected to the front end of the front frames 1 and 1 and extending in the vehicle width direction. And a shroud member 3 disposed at the front side of the cross member 2 and supporting a lower end of a shroud panel (not shown).
A pair of bumper stays 4 having rear ends fixed near the left and right ends of the front end cross member 2 are provided. , The bumper stay
Fixed to 4,4.

The engine En is located between the front frames 1
(Shown in phantom lines in FIG. 2), and a steering shaft St is provided on the left front frame 1.
A gear box Bg to which the front end of the gear box is connected is attached.

In the above-described vehicle, the front portions of the front frames 1 and 1 are formed by being bent slightly downward from the middle as shown in FIG. 2 due to the mounting position of the gear box Bg and the layout of the engine En. And front bumper 5
Are arranged offset above the left and right front frames 1. That is, the above bumper stay
4 and 4 have their rear ends fastened and fixed to the upper surface side of a box-shaped stay bracket 6 fixed to the upper front end of the front frame 1.

In this embodiment, since the front bumper 5 is mounted offset from the front frames 1 and 1, the front frames 1 and 1 do not sufficiently absorb the impact in the early stage of the vehicle when a frontal collision occurs. In order to prevent the entire frame from being distorted due to consumption of the entire deformation amount, the front sides of the left and right front frames 1 are respectively provided from the front ends of the front frames 1 and the front of the shroud member 3 in front of the vehicle body. A pair of front and rear extension members 10 and 11 extending toward the front end are provided.

That is, of the extension members 10 and 11, the front extension member 1
As shown in FIGS. 3 and 4, 1 (shroud extension member) is formed in a box shape using, for example, a pressed steel plate, and a rear portion thereof is fixed to the front side of the shroud member 3. The rear extension member 10 (frame extension member) is similarly formed in a box shape from a pressed steel plate, and is fixed to, for example, the front end of the front frame 1.
Note that a towing hook 13 fixed to a hook bracket 12 is disposed below the frame extension member 10.

In the above configuration, when the vehicle has a frontal collision, for example, as shown in FIG. 5, when the front bumper 5 collides with the collision target W, the shroud extension member 11 collides immediately after that and moves rearward. . Then, the shroud extension member 11 comes into contact with the frame extension member 10, and an axial load is input to the front frame 1 via both the extension members 11 and 10. That is, the front frame 1 has received an axial load before being largely bent in the vertical direction by the bending moment caused by the load from the bumper. That is, the above front frame
In the case of 1,1, the bending deformation in the early stage of the collision is suppressed, and the deformation occurs while effectively absorbing the impact energy.

As described above, according to the present embodiment, a pair of front and rear extension members 10 and 11 extending toward the front of the vehicle body are provided on the front side of the left and right front frames 1 and the front extension member 11 is , The front end surface of which is the front bumper 5
Is positioned rearward by a predetermined distance from the front end surface of the front bumper 5, so that at the time of a frontal collision of the vehicle, the extension member 11 collides immediately after a collision load is input to the front bumper 5, whereby the extension members 11 and 10 , An axial load is input to the front frames 1 and 1 at an early stage. Therefore, the bending deformation of the front frames 1 and 1 in the early stage of the vehicle collision can be suppressed, and the initial G can be prevented from lowering.

As a result, the occupant can be effectively restrained by using the seat belt in the initial stage of the collision, and safety can be improved.

In the above embodiment, the rear extension member (frame extension member 10) is attached to the front end of the front frame 1. Instead, the rear extension member is attached to the rear surface of the shroud member 3. May be attached.

The above-described embodiment (first embodiment) is different from the above-described reinforcing member 1.
Although 0 and 11 are provided separately, both may be formed integrally. Hereinafter, a second embodiment of the present invention will be described. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and further description is omitted.

As shown in FIGS. 6 and 7, in the present embodiment, the front ends of the left and right front frames 1 pass forwardly below the shroud members 3 disposed slightly above the case of the first embodiment. A frame extension member 20 extending to the front is attached. Note that the frame extension member 20 is provided with, for example, a plurality of grooves 20a so that the shock absorption of the extension 20 can be ensured.

The rear end of the extension member 20 is fixed to the front end of the front frame 1 while the front end is located slightly behind the front end surface of the front bumper 5. Immediately thereafter, the front end of the extension member 20 collides, and the same effects as in the first embodiment can be obtained.

The frame extension member 20 is a front frame 1
Can be formed integrally with the front frame 1 by extending the front end side of the front frame toward the front.

[Brief description of the drawings]

1 and 2 are an explanatory plan view and a side view showing a frame structure of a front portion of a vehicle body of a vehicle according to a first embodiment of the present invention. FIG. 3 is a perspective view of an extension member according to the first embodiment. FIG. 4 is a cross-sectional explanatory view showing the mounting structure, FIG. 4 is a vertical cross-sectional view showing the mounting structure of the extension member, and FIG. 5 is a side explanatory view showing a deformed state of the front frame according to the first embodiment in the initial stage of collision. 6 and 7 are an explanatory plan view and an explanatory side view showing a frame structure of a front portion of a vehicle body of a vehicle according to a second embodiment of the present invention. FIG. It is a side explanatory view showing a deformation state. 1 ... Front frame, 5 ... Front bumper, 10,1
1,20 …… Extension members.

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Claims (3)

(57) [Claims] 1. A front body structure of a vehicle comprising a front bumper mounted to be offset above a frame member extending in the front-rear direction of the vehicle body, wherein an extension extending forward of the vehicle body at a front side of the frame member. A member is disposed, a front end surface of the extension member is set to be located behind the front end surface of the front bumper by a predetermined amount, and a vehicle traction extending toward a front of the vehicle body is provided on a lower surface of the frame member. A vehicle body front structure in which a vehicle member is mounted so as to be offset downward, and a front end portion of the vehicle towing member is set to be located forward of the vehicle body with respect to a front end surface of a frame member. 2. A shroud member for supporting a front wall of an engine room is disposed in front of the frame member. The extension member includes a front extension member fixed to a front side of the shroud member, and a rear side of the shroud member. The vehicle body front structure according to claim 1, further comprising a rear extension member fixed to a front end of the frame member. 3. The vehicle body front structure according to claim 1, wherein the extension member is provided with a groove capable of absorbing a shock in the vehicle longitudinal direction.