JP3500897B2 - Car front body structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front body structure of a vehicle capable of effectively suppressing deformation of a vehicle compartment in a frontal collision of a vehicle such as an automobile.

[0002]

2. Description of the Related Art In the case of a frontal collision of a vehicle such as an automobile, a dash panel is provided by a front input of a double-girder frame (subframe) for supporting heavy objects such as an engine and a transmission and front side members elastically coupled to the double-girder frame. Also, the floor panel and the like are deformed, and it becomes impossible to secure a sufficient passenger compartment space. This is particularly remarkable in the case of an offset collision in which the front input is partially concentrated (a collision occurs on one side of the vehicle by operating the steering wheel to avoid the collision).

[0003]

However, in the prior art, as shown in FIG. 6, the front side member 100 and the double girder frame 101 are simply elastically connected at their front end portions (see FIG. At the time of a collision, the relative displacement in the front-rear direction on the rear end side of both members 100 and 101 becomes large, that is, the cross girder frame 101 on which a heavy object such as an engine is mounted is bent into a V shape. Due to a collision with a heavy object such as an engine, the front side member 100 is intruded into the passenger compartment 102 side (input).
Therefore, there is a problem in that the excessive deformation of the vehicle compartment 102 locally causes a large deformation of the vehicle compartment.

As a countermeasure against this, Japanese Patent Laid-Open No. 1-237267
As disclosed in Japanese Patent Publication No. JP-A-2003-264, it is conceivable that the side frame (front side member 100) and the sub-member (double girder frame 101) are rigidly connected by a support member to disperse the input. Since the vibration of the engine etc. is transmitted directly to the vehicle interior, it is difficult to realize.

SUMMARY OF THE INVENTION An object of the present invention is to provide a front body structure of an automobile capable of effectively suppressing deformation of a vehicle compartment at the time of a frontal collision of a vehicle such as an automobile by a simple means.

[0006]

In order to achieve the above object, a front body structure of an automobile according to the present invention comprises a dash panel for partitioning an engine room of the vehicle and a vehicle interior, and both side walls of the engine room. A front side member that is disposed and extends in the front-rear direction; and a subframe that is disposed below the front side member and has a front end supported by the front side member and a rear end supported by a lower portion of the dash panel via elastic members. , The front side men
Rutotomoni and a restraining member which connects the bars and the subframe for restraining the displacement of said front side member and the sub-frame at the time of collision of the vehicle, said restraining member the resilient support
It is characterized by having a predetermined play corresponding to the part . Also, the restraint member is divided into two in the middle part.
It consists of a pull rod, and the play is
It is preferable that they are held and connected.

According to this, during normal traveling, a slight relative displacement between the front side member and the sub-frame is allowed and the elastic coupling effect between both members is maintained, while at the time of a vehicle collision, the restraint member causes A large relative displacement on the rear end side of both members is prevented, the load distribution of the input to the vehicle interior is promoted, and the deformation of the vehicle interior is suppressed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The front body structure of an automobile according to the present invention will be described in detail below with reference to embodiments.

[Embodiment] FIG. 1 is a structural view of a front portion of a vehicle showing an embodiment of the present invention, FIG. 2 is a bottom view of an essential portion of FIG. 1, FIG. 3 is a sectional view of an elastic coupling portion, and FIG. FIG. 5 is an explanatory view of a rod, and FIG.

As shown, the engine room 2 of the vehicle body 1
The vehicle compartment 3 is defined by a dash panel 4, and a floor panel 5 for forming a vehicle compartment is horizontally connected to a lower end portion of the dash panel 4.

A front side member 6 extending in the vehicle front-rear direction is disposed in front of the dash panel 4 in the vehicle body, and a rear end portion of the front side member 6 has a substantially U-shaped cross section. 4 and a lower surface of the front end of the floor panel 5 are joined together. Reference numeral 7 in the drawing denotes a front floor side member extending from the rear end of the front side member 6 to the rear of the vehicle body.

Below the front side member 6,
A girder frame 8 is mounted as a sub frame to which a heavy object such as an engine or a transmission is mounted and a suspension arm is coupled.

The left and right front end portions of the double-sided girder frame 8 are connected to the front end portions of the left and right front side members 6 respectively by bolts 10 and nuts 11 via rubber bushes 9 to be described later. The right rear ends are also connected to the lower surface of the dash panel 4 via the rubber bush 9 with bolts 10 and nuts 11, respectively.

As shown in FIG. 3, the rubber bush 9 is formed by vulcanizing and adhering rubber 9c between the inner and outer cylinders 9a and 9b, and the outer cylinder 9b is provided with a mounting hole 8a for the double girder frame 8.
Be welded to. Then, the bolt 10 penetrating the inner cylinder 9a is screwed into the nut 11 welded to the front side member 6 (and the dash panel 4), whereby the members 6 (and 4) and 8 are elastically coupled. Of. In the figure, 12 is a washer.

The space between the front side member 6 and the rear end of the horizontal girder frame 8 is a pull rod 1 as a restraining member.
Connected at 3. As shown in FIG. 4, the pull rod 13 is divided into two pieces at an intermediate portion, and each base end portion is welded to the front side member 6 and the cross frame 8. Then, a predetermined play (both A and B is about 1) corresponding to the above-mentioned elastic coupling portion is provided between the respective annular tip portions 13a and 13b.
0 mm) is connected.

Due to this structure, as shown in FIG. 5, during normal running of the vehicle, since the front side member 6 and the cross girder frame 8 are elastically coupled, a slight relative displacement occurs between them. Although it occurs, the pull rod 13 absorbs it by the above-mentioned play (see a in the same figure).

On the other hand, in the case of a frontal collision of the vehicle, the double girder frame 8 and the front side member 6 elastically coupled to the double girder frame 8 are provided.
A front input such as acts on the dash panel 4 and the floor panel 5. At this time, the cross girder frame 8 on which a heavy object such as an engine is mounted folds in a V shape and tries to input to the passenger compartment 3 side ahead of the front side member 6, but when displaced by the above play, the rear end sides of both Is restrained by the pull rod 13, so that further relative displacement is prevented (see FIG.
reference).

As a result, the rear end sides of both of them try to enter the vehicle compartment 3 at the same time, but since the pressure receiving area on the vehicle compartment 3 side is large, the load distribution of the input to the vehicle compartment 3 is promoted. The deformation of the passenger compartment 3 is suppressed to a small level. At the same time, the engine room 2 is effectively crushed, that is, a crushable body is realized, so that the living space in the vehicle interior 3 is maintained.

In the above embodiment, the pull rod 13 is divided into two pieces, but it may be formed by one piece so that at least one end is elastically coupled. Further, instead of the rod-shaped member, a cord such as a wire may be used.

[0020]

As described above, according to the present invention, a dash panel for partitioning an engine compartment of a vehicle from a passenger compartment, a front side member arranged along both side walls of the engine compartment and extending in the front-rear direction, A sub-frame arranged below the front side member and having a front end supported by the front side member and a rear end supported by a lower part of the dash panel via elastic members, respectively, and the front side member and the sub-frame when the vehicle collides. Since the restraint member that restrains the displacement with respect to the sub-frame is provided, it is possible to effectively suppress the deformation of the vehicle compartment at the time of a frontal collision of a vehicle such as an automobile by a simple and inexpensive means.

[Brief description of drawings]

FIG. 1 is a structural diagram of a vehicle front portion showing an embodiment of the present invention.

FIG. 2 is a bottom view of an essential part of FIG.

FIG. 3 is a sectional view of an elastic coupling portion.

FIG. 4 is an explanatory diagram of a pull rod.

FIG. 5 is an operation explanatory view.

FIG. 6 is a diagram for explaining the operation of the conventional example.

[Explanation of symbols]

1 car body 2 engine room 3 car compartment 4 dash panel 5 floor panels 6 Front side members 7 Front floor side members 8 double girder frame 9 rubber bush 10 volts 11 nuts 13 Pull bar

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B62D 25/20 B62D 21/15

Claims (2)

(57) [Claims] 1. A dash panel for partitioning an engine compartment of a vehicle from a passenger compartment, a front side member arranged along both side walls of the engine compartment and extending in the front-rear direction,
A sub-frame arranged below the front side member and having a front end supported by the front side member and a rear end supported by a lower part of the dash panel via elastic members, respectively, and the front side member and the sub-frame are connected to each other.
To Rutotomoni a restraining member for restraining the displacement of said front side member and the sub-frame at the time of collision of the vehicle,
The restraint member has a predetermined play corresponding to the elastic support portion.
A front body structure of an automobile characterized by having . 2. The restraint member according to claim 1, wherein the restraint member is an intermediate member.
It consists of a pull rod divided into two parts,
It is characterized in that it is connected with the play at the end.
Front body structure of a car.