JPH09226631A - Body front part structure for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively absorb energy based on impact force by a front part of a car body so as to prevent partly the impact force from acting toward a rear side part of an automobile, when the impact force is received to the front part of the car body by colliding against any object existing in the front of the automobile during advance running. SOLUTION: A connection frame 16 is protrusively provided in a front part 12c of each subside frame 12. A rear end 12d of each subside frame 12 is connected to a rear end 7b of each side frame 7 and/or a dash cross member 9. A stabilizer bracket 23 is extended toward front upward from a subframe 5. This extended and 23b is connected to a front cross member 8. A halfway part of a stabilizer 21 is supported to this stabilizer bracket 23 in the vicinity of the extended and 23b of the stabilizer bracket 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body front structure provided with a main frame and a subframe which is connected to the main frame to pivotally support a lower arm for supporting front wheels.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned vehicle body front structure is
There is one disclosed in Japanese Patent Laid-Open No. 1-237267.

According to this, a main frame which constitutes a front part of a vehicle body of an automobile is provided, and the main frame includes a pair of left and right side frames extending in the front-rear direction and a front end for connecting front ends of the both side frames to each other. The cross member and the dash cross member for connecting the rear ends of both side frames to each other are provided.

Further, a sub-frame is provided which constitutes the front part of the vehicle body and is located below the main frame. The sub-frame includes a pair of left and right sub-side frames extending in the front-rear direction and each of these sub-side frames. And a sub-front frame projecting from the front end of each of the sub-side frames toward the front upper side, and the projecting end of which is coupled to the front end of each of the side frames. There is.

Although not shown in the above publication,
A lower arm for supporting front wheels is vertically pivotably supported at the front portion of each sub-side frame, and the front portion of the vehicle body is supported on the road surface by the front wheels.

On the other hand, conventionally, an automobile traveling forward is
When an object such as another automobile existing in front of the vehicle collides with the object, the impact force can plastically deform the constituent member at the front part of the vehicle body to absorb energy based on the impact force. Proposed.

[0007]

SUMMARY OF THE INVENTION However, according to the publication, the connecting frames are provided so as to extend over substantially the entire sub-side frames, and the connecting frames allow the sub-side frames to be entirely covered. As a result of being reinforced, the strength is improved, and therefore,
The sub-side frames are less likely to be plastically deformed by the impact force.

Further, the front end of each side frame is a portion which is immediately subjected to an impact force at the time of the collision,
As described above, the front ends of the sub-front frames are coupled to the front ends of these side frames, and as a result, the front ends of the side frames are also reinforced and the strength is improved. Therefore, the front portions of the sub-side frames are also less likely to be plastically deformed by the impact force.

Therefore, in the above-mentioned conventional technique, the energy based on the impact force at the time of collision is not sufficiently absorbed in the front portion of the vehicle body, and a part of the impact force may be directed to the rear portion side of the automobile.

The present invention has been made by paying attention to the above circumstances. When a vehicle traveling in a forward direction collides with an object existing in front of the vehicle and the front portion of the vehicle body receives an impact force, It is an object of the present invention to effectively absorb the energy based on the impact force in the front portion of the vehicle body so that part of the impact force does not face the rear portion side of the automobile.

[0011]

A vehicle body front structure according to the present invention for achieving the above object is as follows.

According to the first aspect of the present invention, the main frame 4 has a pair of left and right side frames 7, 7 extending in the front-rear direction, a front cross member 8 for connecting the front ends of the both side frames 7, 7 to each other, and the same as above. Side frame 7,7
And a pair of left and right sub-side frames 12 and 12, each of which has a dash cross member 9 for connecting the rear ends of the sub-frames to each other, and the sub-frame 5 provided below the main frame 4 extends in the front-rear direction. And a coupling frame 16 projecting from the lower side arm 7 and coupled to the side frame 7, the lower arms 20 are pivotally supported by the front portions 12c of the sub-side frames 12, respectively. In the case where a stabilizer 21 for connecting the two is provided, and a stabilizer bracket 23 is provided which projects from the sub-frame 5 and supports an intermediate portion in the longitudinal direction of the stabilizer 21,
The coupling frame 16 is provided so as to project from the front portion 12c of each sub-side frame 12, and the rear end 12d of each sub-side frame 12 is coupled to the rear end 7b of each side frame 7 and / or the dash cross member 9 as described above. The stabilizer bracket 23 is extended from the front side of the sub-frame 5 toward the front upper side, and the extension end 23b is coupled to the front cross member 8, and the stabilizer bracket 23 is provided in the vicinity of the extension end 23b. The stabilizer bracket 23 supports the middle portion of the stabilizer 21.

According to the invention of claim 2, in addition to the invention of claim 1, the lower portion of the front end 7a of each side frame 7 is made to project downward from the general portion 28 of the front portion 7d of the side frame 7. The protrusion 29 is formed.

The invention of claim 3 is the invention of claim 1 or 2.
In addition to the above invention, in the stabilizer bracket 23, among the strength of each part in the longitudinal direction, the sub-frame 5
The strength lowering portion 30 for lowering the strength of the base portion 23a near the front portion is formed on the base portion 23a.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a vehicle, and an arrow Fr indicates the front in the traveling direction of the vehicle, and the left and right described below means the vehicle width direction toward the front.

The front portion of the vehicle body 2 of the automobile 1 has a body frame 3 made of sheet metal, and the body frame 3 is provided below the main frame 4 and is joined to the main frame 4. And the subframe 5 that has been created. The main frame 4 supports an outer plate (body) that constitutes the outer shell of the front part of the vehicle body 2, the sub-frame 5 supports front wheels by a suspension 6, and is an internal combustion engine for driving and driving an automobile. Supports the engine.

The main frame 4 is a pair of left and right side frames 7 and 7 which are located on the left and right side portions of the front portion of the vehicle body 2 and extend in the front-rear direction, and the left and right side frames 7 and 7 respectively extend on both sides. A front cross member 8 for connecting the front ends 7a to each other, and a left and right side frame 7,
And a dash cross member 9 for connecting the rear ends 7b of 7 to each other.

The sub-frame 5 is located on the left and right sides of the front part of the vehicle body 2 below the left and right sub-frames 5 and 5 and extends in the front-rear direction.
2 and 12, a sub-front cross member 13 that extends in the left-right direction and connects the front ends 12a of the sub-side frames 12, 12 to each other, and a sub-front cross member that extends in the left-right direction A sub-rear cross member 14 for connecting the sub-frames 12b to each other and a sub-rear cross member 14 projecting upward from a front portion 12c of each of the sub-side frames 12 and detachably attached to a middle portion 7c of each of the side frames 7 in the front-rear direction by a fastener And a coupling frame 16 coupled to the.

The connecting frame 16 has a gate shape in a side view. A rear end 12d of each sub-side frame 12 is connected to a rear end 7b of the side frame 7 by a fastener 17.
Are connected by

In the suspension 6, the lower arm 20 is pivotally supported on the front portion 12c of each sub-side frame 12 through a pair of front and rear pivot shafts 19 and 19 and an elastic body so that the lower arm 20 is vertically swingable. have. The front wheels are supported on the swinging ends of the lower arms 20, respectively. The left and right lower arms 20, 20 extend in the left and right in front of each of the lower arms 20, 2,
A stabilizer 21 connected to each 0 is provided,
The stabilizer 21 is provided to reduce rolling of the vehicle body 2. Of the pivot shafts 19 and 19, the shaft center of the front pivot shaft 19 extends in the front-rear direction, and the shaft center of the rear pivot shaft 19 extends substantially vertically.

A pair of left and right stabilizer brackets 23 are provided extending substantially linearly from the front end 12a side of each sub-side frame 12, which is the front portion of the sub-frame 5, toward the front upper side. The base 23 a of each of the stabilizer brackets 23 is connected to the front end 12 a of the sub-side frame 12 by a fastener 24.
On the other hand, the extension end 23b of the stabilizer bracket 23
Is connected to a longitudinally intermediate portion of the front cross member 8 of the main frame 4 by a fastener 25. The front end 7a of the side frame 7 of the main frame 4 and the extension of the corresponding stabilizer bracket 23 are provided. End 23b
Is deviated left and right.

A supporting member 26 supports a midway portion of the stabilizer 21 in the longitudinal direction in the vicinity of the extending ends 23b of the stabilizer brackets 23 and on the front side of the stabilizer brackets 23.

The lower portion of the front end 7a of each side frame 7 is made to project downward more than the lower portion of the general portion 28 of the front portion 7d of the side frame 7, whereby the front end 7a of each side frame 7 is formed. A protrusion 29 is formed on the lower part of the. The protruding portion 29 is a support bracket for supporting a bumper or the like disposed below the front end 7a of each of the side frames 7, and is protruded as described above for convenience of the support.

In each of the stabilizer brackets 23, among the strengths of the respective parts in the longitudinal direction, the sub-frame 5
Strength lowering portion 30 for lowering the strength of the base portion 23a near the front end 12a of the sub-side frame 12 which is the front portion of the
Are formed on the upper surface of the base 23a. Specifically, the strength-reducing portion 30 is formed of a notch (concave groove) that is formed on the upper surface of the base portion 23a of the stabilizer bracket 23 and that extends leftward and rightward.

Each of the side frames 7 of the main frame 4 has a vertically long box-like cross section when viewed from the front.
Notches 3 vertically long on the left and right sides of the front part 7d
2 are press-formed in the front-rear direction. And
By providing the notch 32, the strength of the side frame 7 against the load in the front-rear direction (longitudinal direction) is reduced to some extent, that is, the side frame 7 is easily plastically deformed by the compressive load in the longitudinal direction. ing.

A plurality of through holes 33 are formed in the stabilizer bracket 23 in the longitudinal direction thereof. By forming the through holes 33, the strength of the stabilizer bracket 23 with respect to the load in the longitudinal direction is reduced to some extent, that is, the stabilizer bracket 23 is easily plastically deformed by the compressive load in the longitudinal direction. I have.

A dash panel 35 extending upward from the dash cross member 9 is provided. In front of the dash panel 35, an internal space in the front part of the vehicle body 2 surrounded by the vehicle body frame 3 and the outer plate is an engine room 36 for accommodating the engine. The interior space at the rear of the vehicle body 2 behind the dash panel 35 is a vehicle compartment 37.

The front portion of the vehicle body 2 is substantially symmetrical with respect to an imaginary center line 38 passing through the center in the vehicle width direction.

In particular, referring to FIG. 1, according to the above configuration, the coupling frame 16 is projectingly provided on the front portion 12c of each sub-side frame 12, and the rear end 12d of each sub-side frame 12 is the same as above. It is attached to the rear end 7b.

That is, the midway portion 7c in the front-rear direction of the side frame 7 is reinforced by joining the joining frame 16 to the joining portion 16, and the strength is improved, but the strength of the rear portion 7e of the side frame 7 remains unchanged. Kept in.

Further, as described above, the front portion 12c of the sub-side frame 12 is reinforced by projecting the coupling frame 16 so that the strength is improved, but the rear portion 12e of the sub-side frame 12 is strengthened. The strength remains the same.

Therefore, when the vehicle 1 traveling in a forward direction collides with an object existing in front of it, the impact force F that is directed substantially rearward is generated by the rear portion 7e of the side frame 7 and the sub side frame 12. The rear portion 12e is surely plastically deformed in its longitudinal direction, so that the energy based on the impact force F is surely absorbed by the front portion of the vehicle body 2.

Further, as described above, the stabilizer bracket 23 is extended from the front side of the subframe 5 toward the front upper side, and the extended end 23b is joined to the front cross member 8.

That is, when the front portion of the sub-frame 5 is connected to the front end of the main frame 4 by the stabilizer bracket 23, the extending end 23b of the stabilizer bracket 23 is connected to the front end 7a of the side frame 7. Since it does not exist, the front end 7 of the side frame 7
a is prevented from being reinforced by the extending end 23b of the stabilizer bracket 23. Thus, when the front portion 7d of the side frame 7 undergoes the plastic deformation due to the impact force F, the range in which the plastic deformation is possible is prevented from being narrowed.

Further, as described above, the stabilizer 21 is provided in the vicinity of the extending end 23b of the stabilizer bracket 23 and on the front side of the stabilizer bracket 23.
The middle part of is supported.

For this reason, since the middle portion of the stabilizer 21 is located closer to the front end side of the front portion of the vehicle body 2, the impact force F is more surely provided in the middle portion of the stabilizer 21 when the automobile 1 collides. This impact force F is applied to the rear portion 12e of the sub-side frame 12 via the lower arm 20 connected to the stabilizer 21 and the front portion 12c of the sub-side frame 12 that pivotally supports the lower arm 20. Reportedly.

Therefore, the rear portion 12e of the sub-side frame 12 is more surely plastically deformed.

By the way, when the lower portion of the front end 7a of each side frame 7 is made to project downward as described above, the front portion 7d of the side frame 7 including the projecting portion 29 is provided.
When the impact force F is applied to the side frame 7, the impact force F becomes a load that is deviated downward as viewed from the general portion 28 of the front portion 7d of the side frame 7, thereby moving the front portion 7d of the side frame 7 downward. A turning moment is generated, and the front portion 7d of the side frame 7 is simply bent downward, so that the plastic deformation of the front portion 7d of the side frame 7 tends to be suppressed.

However, as described above, since the front end 7a of the side frame 7 is supported by the stabilizer bracket 23 via the front cross member 8, even when the impact force F is received, the side frame 7 is not supported. Bending of the front part 7d is prevented, and this side frame 7
Of the front part 7d is maintained in the shape extending in the front-rear direction.

Therefore, the front portion 7d of the side frame 7 is
Receives an impact force F, it acts as a compressive force in the longitudinal direction of the side frame 7 and, together with the presence of the notch 32, the front portion 7d of the side frame 7 faces rearward. Plastic deformation and its length is reduced.

When an impact force F is applied to the front portion 7d of the side frame 7, a part of the impact force F acts on the stabilizer bracket 23 as a compressive force in the longitudinal direction thereof, so that the penetrating In combination with the presence of the hole 33, the stabilizer bracket 23 is smoothly plastically deformed downward and rearward in the longitudinal direction, and the length thereof is contracted.

Then, as described above, when the front portion 7d of the side frame 7 and the stabilizer bracket 23 are both contracted, the stabilizer bracket 23 is contracted.
Since the strength-reducing portion 30 is easily bent, the stabilizer bracket 23 rotates rearward about the strength-reducing portion 30.

As described above, by the contraction of the front portion 7d of the side frame 7 and the stabilizer bracket 23 in the longitudinal direction and the rotation of the stabilizer bracket 23, the extension end 23 of the stabilizer bracket 23 is formed.
b moves substantially horizontally toward the rear.

Therefore, the stabilizer bracket 23
Front portion 7 of side frame 7 supported by extension end 23b of
d is also prevented from bending upward or downward, and is moved substantially horizontally toward the rear, that is, the front portion 7d of the side frame 7 is compressed toward the rear in its longitudinal direction, As a result, the front portion 7d of the side frame 7 is sufficiently plastically deformed, and the energy based on the impact force F is sufficiently absorbed.

Although the above is based on the illustrated example, the rear end of each sub-side frame 12, which is the rear end of the sub-frame 5, may be connected to the dash cross member 9. Further, the middle portion of the stabilizer 21 may be supported on the rear surface side of the stabilizer bracket 23 in the vicinity of the extending end 23b of the stabilizer bracket 23, or may be passed through the stabilizer bracket 23 and supported by the stabilizer bracket 23. May be.

[0047]

The effects of the present invention are as follows.

According to the first aspect of the present invention, a pair of left and right side frames whose main frame extends in the front-rear direction, a front cross member for connecting the front ends of the both side frames to each other, and the rear ends of the both side frames to each other are the same. A pair of left and right sub-side frames, each of which has a dash cross member to be joined and which is provided below the main frame and extends in the front-rear direction, and a joint projecting from each of the sub-side frames and joined to the side frame. And a stabilizer provided at the front portion of each of the sub-side frames to pivotally support the lower arms so as to be swingable, and to connect the both lower arms to each other.
In a vehicle body front structure provided with a stabilizer bracket projecting from the sub-frame and supporting a midway portion in the longitudinal direction of the stabilizer, the coupling frame is projected to the front part of each sub-side frame, and the same as above. The rear end of the sub-side frame is connected to the rear end of each side frame and / or the dash cross member.

That is, the middle portion of the side frame in the front-rear direction is reinforced by joining the joining frame to the joining frame, and the strength is improved, but the strength of the rear portion of the side frame is maintained as it is.

Further, as described above, the front portion of the sub-side frame is provided with the coupling frame so as to project.
As a result of being reinforced, the strength is improved, but the strength of the rear part of the sub-side frame is maintained as it is.

Therefore, when an automobile running forward collides with an object existing in front of it, the impact force of the automobile surely causes the rear portion of the side frame and the rear portion of the sub-side frame in the longitudinal direction thereof. The energy resulting from the plastic deformation and thus the impact force is reliably absorbed by the front portion of the vehicle body, and the impact force is prevented from being transmitted to the rear side of the vehicle.

Also, the stabilizer bracket is extended from the front side of the sub-frame toward the front upper side, and the extended end is connected to the front cross member.

That is, when the front portion of the sub-frame is connected to the front end of the main frame by the stabilizer bracket, the extending end of the stabilizer bracket is not connected to the front end of the side frame, and therefore the side frame is not connected. It is prevented that the front end of the side frame is reinforced by the extended end of the stabilizer bracket, and therefore, when the front part of the side frame is subjected to impact force and is plastically deformed, its plastically deformable range is narrowed. That is prevented.

Therefore, the impact force causes the front portion of the side frame to be plastically deformed sufficiently, and thus the energy based on the impact force is sufficiently absorbed by the front portion of the vehicle body.

Further, in the vicinity of the extended end of the stabilizer bracket, the stabilizer bracket supports the midway portion of the stabilizer.

For this reason, since the middle part of the stabilizer is located on the front end side of the front part of the vehicle body, the impact force is more reliably given to the stabilizer at the time of collision of the vehicle, and this impact force is The lower arm connected to the stabilizer and the front portion of the sub-side frame that pivotally supports the lower arm are sequentially transmitted to the rear portion of the sub-side frame.

Therefore, the rear portion of the sub-side frame is more surely plastically deformed, so that the energy based on the impact force is more surely absorbed by the front portion of the vehicle body.

According to the second aspect of the present invention, the lower portion of the front end of each side frame is formed so as to project downward from the general portion of the front portion of the side frame to form the projecting portion, which has the following effects.

That is, when the lower portion of the front end of each side frame is made to project downward as described above, when an impact force is applied to the front part of the side frame including the projecting portion, this causes the above to occur. A moment that causes the front portion of the side frame to be directed downward is generated, and the front portion of the side frame is merely bent downward, and plastic deformation of the front portion of the side frame tends to be suppressed.

However, as shown in the invention of claim 1,
Since the front end of the side frame is supported by the stabilizer bracket via the front cross member, the front part of the side frame is prevented from being bent even if it receives the impact force, and the front part of the side frame is moved forward and backward. The shape that extends in the direction is retained.

Therefore, when the front portion of the side frame receives an impact force, it acts as a compressive force in the longitudinal direction of the side frame, and thus the front portion of the side frame is smoothly plastically moved rearward. It is deformed and the energy based on the impact force is sufficiently absorbed.

According to a third aspect of the present invention, in the stabilizer bracket, the strength-reduced portion that reduces the strength of the base portion in the vicinity of the front portion of the sub-frame among the strength of each portion in the longitudinal direction is formed on the base portion. The following effects occur.

That is, when an impact force is applied to the front portion of the side frame, a part of the impact force acts on the stabilizer bracket in the longitudinal direction thereof, and the stabilizer bracket extends rearward and downward in the longitudinal direction. It can be smoothly plastically deformed. Further, as described in claim 2,
At the same time, the impact force also causes the front portion of the side frame to plastically deform rearward in the longitudinal direction. Then, as described above, when the front portion of the side frame and the stabilizer bracket are both plastically deformed and contracted, the strength-reduced portion of the stabilizer bracket is easily bent, so that the strength-reduced portion is mainly formed. The stabilizer bracket rotates rearward.

For this reason, the contraction in the longitudinal direction of the front portion of the side frame and the stabilizer bracket,
By the rotation of the stabilizer bracket, the extended end of the stabilizer bracket moves rearward substantially horizontally.

Therefore, the front portion of the side frame supported by the extended end of the stabilizer bracket is also prevented from being bent upward or downward, and is moved substantially horizontally toward the rear, that is, the side frame. The front portion of the side frame is compressed rearward in its longitudinal direction, and as a result, the front portion of the side frame is sufficiently plastically deformed to sufficiently absorb the energy due to the impact force.

[Brief description of drawings]

FIG. 1 is a side view of a front portion of a vehicle body.

FIG. 2 is a plan view of a left side portion of a front portion of a vehicle body.

FIG. 3 is a front view of a left side portion of a front portion of the vehicle body.

FIG. 4 is a perspective view of a front portion of a vehicle body and a partially omitted view.

[Explanation of symbols]

 1 Car 2 Body 3 Body Frame 4 Main Frame 5 Subframe 6 Suspension 7 Side Frame 7a Front End 7b Rear End 7c Midway Part 7d Front 7e Rear 8 Front Cross Member 9 Dash Cross Member 12 Subside Frame 12a Front End 12b Midway 12c Front Part 12d Rear end 12e Rear part 13 Sub-front cross member 16 Coupling frame 19 Pivot shaft 20 Lower arm 21 Stabilizer 23 Stabilizer bracket 23a Base part 23b Extended end 28 General part 29 Projection part 30 Strength reduction part F Impact force

Claims (3)

[Claims] 1. A pair of left and right side frames in which a main frame constituting a front portion of a vehicle body extends in a front-rear direction, a front cross member for connecting front ends of these both side frames to each other, and respective rear ends of both side frames. A sub-frame, which is provided with a dash cross member to be coupled to each other and constitutes a vehicle body front part and which is provided below the main frame, extends in the front-rear direction, and a pair of left and right sub-side frames projecting from each of the sub-side frames. And a coupling frame coupled to the side frame, and a stabilizer for pivotally supporting the lower arms swingably at the front portion of each of the sub-side frames and connecting the lower arms to each other is provided to the sub-frame. Install a stabilizer bracket that projects and supports the middle part of the stabilizer in the longitudinal direction. In the provided vehicle body front structure, the coupling frame is projected from the front of each sub-side frame, and the rear end of each sub-side frame is coupled to the rear end of each side frame and / or the dash cross member. Then, the stabilizer bracket is extended from the front side of the sub-frame toward the front upper side, and the extended end is coupled to the front cross member, and the stabilizer bracket is provided in the vicinity of the extended end of the stabilizer bracket. A front structure of a vehicle body in which the middle part of the stabilizer is supported by the. 2. The vehicle body front structure according to claim 1, wherein a lower portion of a front end of each side frame projects downward from a general portion of a front portion of the side frame to form a projecting portion. 3. The stabilizer bracket according to claim 1 or 2, wherein a strength-reducing portion that reduces the strength of the base portion in the vicinity of the front portion of the sub-frame among the strength of each portion in the longitudinal direction is formed on the base portion. Car body front structure.