JP3346697B2 - Car body front 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 vehicle body front structure including a main frame and a sub-frame 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 front structure of a vehicle body has
There is one disclosed in JP-A-1-237267.

According to this, a main frame constituting a front portion of a vehicle body of an automobile is provided. The main frame includes a pair of left and right side frames extending in the front-rear direction, and a front frame connecting the front ends of the two side frames to each other. A cross member; and a dash cross member for connecting the rear ends of both side frames to each other.

[0004] A sub-frame is provided below the main frame to constitute a front portion of the vehicle body. The sub-frame includes a pair of left and right sub-side frames extending in the front-rear direction. A coupling frame that is projected and coupled to the side frame; and a sub-front frame that protrudes forward and upward from a front end of each of the sub-side frames and has a protruding end coupled to a front end of each of the side frames. I have.

[0005] And, although not shown in the above-mentioned publication,
At the front of each sub-side frame, a lower arm for supporting a front wheel is pivotally supported so as to be vertically swingable, and the front wheel supports the front of the vehicle body on a road surface.

On the other hand, conventionally, an automobile traveling forward has
When it collides with some other object such as an automobile existing in front of the vehicle, the impact force can be used to absorb the energy based on the impact force by plastically deforming the components at the front of the vehicle body. Proposed.

[0007]

However, according to the above publication, a connecting frame is provided so as to protrude over substantially the entire sub-side frame. The strength has been improved as a result of reinforcement,
Each of the sub-side frames is hardly plastically deformed by the impact force.

In addition, the front end of each of the side frames is a portion which receives an impact force promptly at the time of the collision.
The front end of each of these side frames is connected to the front end of the sub-front frame as described above, and as a result, the front end of the side frame is also reinforced and the strength is improved. Therefore, the front portion of each of the sub-side frames is also less likely to be plastically deformed by the impact force.

Therefore, in the above-mentioned conventional technology, the energy based on the impact force at the time of the collision is not sufficiently absorbed by the front portion of the vehicle body, and there is a possibility that a part of the impact force is directed to the rear portion of the vehicle.

The present invention has been made in view of the above-described circumstances. When a vehicle traveling forward 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 at the front portion of the vehicle body so that part of the impact force does not go to the rear side of the vehicle.

[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, a pair of left and right side frames 7, 7 in which the main frame 4 extends in the front-rear direction, a front cross member 8 for connecting the front ends of the side frames 7, 7 to each other, Side frames 7, 7
And a pair of left and right sub-side frames 12, 12 in which a sub-frame 5 provided below the main frame 4 extends in the front-rear direction. And a connecting frame 16 protruding from the side frame 7 and connected to the side frame 7. The lower arm 20 is pivotally supported on the front portion 12c of each of the sub-side frames 12 so as to be swingable. Are provided, and a stabilizer bracket 23 projecting from the sub-frame 5 and supporting a middle part of the stabilizer 21 in the longitudinal direction is provided.
The binding frame 16 is projected from the front portion 12c of each sub-side frame 12, the rear end 7b of the rear end 12d of each side frame 7 of the same respective sub side frame 12, rather also <br/> dash cross The stabilizer bracket 23 is extended from the front side of the sub-frame 5 toward the front upper side, and the extended end 23b is coupled to the front cross member 8 to extend the stabilizer bracket 23. The stabilizer bracket 23 supports an intermediate portion of the stabilizer 21 near the outlet end 23b.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the lower portion of the front end 7a of each side frame 7 is projected downward from the general portion 28 of the front portion 7d of the side frame 7. The projection 29 is formed.

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

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an automobile, and an arrow Fr indicates the front in the traveling direction of the automobile, and the left and right described below refer to the vehicle width direction toward the front.

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

The main frame 4 includes a pair of left and right side frames 7, 7 extending in the front-rear direction at right and left sides of the front portion of the vehicle body 2, and each of the two side frames 7, 7 extending left and right. A front cross member 8 for connecting the front ends 7a to each other;
And a dash cross member 9 for connecting the respective rear ends 7b of each other to each other.

The sub-frame 5 includes a pair of left and right sub-side frames 12 and 12 which are positioned below the left and right side frames 7 and 7 and extend in the front-rear direction on the left and right sides of the front portion of the vehicle body 2. A sub-front cross member 13 extending to connect the front ends 12a of the two sub-side frames 12, 12 to each other, and a sub-rear extending to the left and right to connect the middle part 12b in the front-rear direction of the two sub-side frames 12, 12 to each other. A connecting frame 16 projecting upward from a front portion 12c of each of the sub-side frames 12 and a cross-member 14 and being detachably connected to a middle portion 7c in the front-rear direction of each of the side frames 7 by a fastener 15. And

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

[0021] The suspension 6, the front 12c of each sub-side frame 12, a lower arm 20 which is swingably pivoted up or down to via a pair of front and rear pivot shafts 19, 19 and the elastic body, respectively Have. Each of these lower arms 2
The front wheels are respectively supported on the swinging ends of zero. Stabilizers 21 are provided which extend left and right in front of the left and right lower arms 20, 20 and whose ends are respectively connected to the lower arms 20, 20. The stabilizers 21 are provided to reduce rolling of the vehicle body 2. ing. Of the pivot shafts 19, 19, the front pivot shaft 1
The axis of the shaft 9 extends in the front-rear direction, and the axis of the rear pivot 19 extends substantially vertically.

A pair of left and right stabilizer brackets 23 are provided which extend substantially linearly from the front end 12a of each sub-side frame 12, which is the front part 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 fixed to a middle part of the front cross member 8 in the longitudinal direction 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.

An intermediate portion in the longitudinal direction of the stabilizer 21 is supported by a support 26 near the extending end 23b of each 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 of the side frames 7 projects downward below 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 of the side frames 7 is formed. A protruding portion 29 is formed at the lower part of the boss. 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 above-mentioned stabilizer brackets 23, the sub-frame 5
Near the front end 12a of the sub-side frame 12, which is the front portion of the base portion 23, a strength reduction portion 30 for reducing the strength of the base portion 23a
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 left and right.

Each of the side frames 7 of the main frame 4 has a vertically long box shape in 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.

The stabilizer bracket 23 has a plurality of through holes 33 in the longitudinal direction. 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 at the front of the vehicle body 2 surrounded by the vehicle body frame 3 and the outer plate is an engine room 36 for housing 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 a virtual center line 38 passing through the center in the vehicle width direction.

Referring to FIG. 1 in particular, according to the above configuration, the connecting frame 16 is provided to project from the front portion 12c of each sub-side frame 12, and the rear end 12d of each sub-side frame 12 It is connected to the rear end 7b.

That is, the intermediate portion 7c in the front-rear direction of the side frame 7 is reinforced by the connection frame 16 being connected thereto, and the strength is improved, but the strength of the rear portion 7e of the side frame 7 remains unchanged. Is kept.

As described above, the front portion 12c of the sub-side frame 12 is reinforced by projecting the coupling frame 16, resulting in an increase in strength. The strength is kept as it is.

Therefore, when the vehicle 1 traveling forward collides with any object present in front of it, the rearward portion 7e of the side frame 7 and the sub-side frame 12 by the impact force F directed substantially horizontally rearward. The rear portion 12e surely plastically deforms in the longitudinal direction, so that the energy based on the impact force F is reliably absorbed by the front portion of the vehicle body 2.

Further, as described above, the stabilizer bracket 23 is extended forward and upward from the front side of the sub-frame 5, and the extended end 23b is connected 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. From 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 near 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 part of the stabilizer 21 is located on the front end side of the front part of the vehicle body 2, the impact force F is more reliably given to the middle part of the stabilizer 21 at the time of collision of the vehicle 1. The 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 pivotally supporting the lower arm 20 in order. Reportedly.

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

When the lower part of the front end 7a of each side frame 7 is protruded downward as described above, the front part 7d of the side frame 7 including the protruding part 29 is formed.
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 The front frame 7d is prevented from being bent.
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
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 as a compressive force on the stabilizer bracket 23 in the longitudinal direction thereof, thereby causing the penetrating force. In combination with the presence of the hole 33, the stabilizer bracket 23 is smoothly plastically deformed rearward and downward in its longitudinal direction, and its length is reduced.

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
Since the strength-reducing portion 30 is easily bent, the stabilizer bracket 23 rotates rearward about the strength-reducing portion 30.

As described above, the contraction in the longitudinal direction of the front portion 7d of the side frame 7 and the stabilizer bracket 23 and the rotation of the stabilizer bracket 23 cause the extension end 23 of the stabilizer bracket 23 to rotate.
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 moved substantially horizontally toward the rear while being prevented from bending upward or downward, that is, the front portion 7d of the side frame 7 is compressed rearward in the longitudinal direction, as a result, the front portion 7d of the side frame 7 is brought sufficiently plastic deformation, energy Le ghee based on the impact force F is sufficiently absorbed.

Although the above description 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 part of the stabilizer 21 may be supported on the rear surface side of the stabilizer bracket 23 in the vicinity of the extension end 23b of the stabilizer bracket 23, or may be supported by the stabilizer bracket 23 through the stabilizer bracket 23. You may.

[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 frames extend in the front-rear direction, a front cross member connecting the front ends of the two side frames to each other, and the rear ends of the two side frames are connected to each other. A pair of left and right sub-side frames, each of which includes a dash cross member to be connected, and a sub-frame provided below the main frame extends in a front-rear direction; and a connection protruding from each of the sub-side frames and connected to the side frame. A frame, and a stabilizer is provided at the front of each of the sub-side frames so as to pivotably support the lower arms, respectively, and to connect these lower arms to each other,
In a vehicle body front structure provided with a stabilizer bracket that protrudes from the sub-frame and supports a middle part in the longitudinal direction of the stabilizer, the coupling frame protrudes from a front portion of each sub-side frame, and rear rear end of each side frame sub-side frame, are also <br/> properly is coupled to the dash cross member.

That is, the intermediate portion of the side frame in the front-rear direction is reinforced by the connection frame being joined thereto, and the strength is improved, but the strength of the rear portion of the side frame is maintained as it is.

As described above, the front portion of the sub-side frame is formed by projecting the connecting frame.
Although the strength is improved as a result of reinforcement, the strength of the rear portion of the sub-side frame is maintained as it is.

Therefore, when the vehicle traveling forward collides with any object present in front of it, the rear portion of the side frame and the rear portion of the sub-side frame are surely moved in the longitudinal direction by the impact force. The plastic deformation causes the energy based on the impact force to be reliably absorbed by the front part of the vehicle body, thereby preventing the impact force from being transmitted to the rear part of the vehicle.

Further, the stabilizer bracket is extended forward and upward from the front side of the sub-frame, and its extended end is connected to the front cross member.

That is, when the front part of the sub-frame is connected to the front end of the main frame by the stabilizer bracket, the extended end of the stabilizer bracket is not connected to the front end of the side frame. Is prevented from being reinforced by the extending end of the stabilizer bracket, and therefore, when the front portion of the side frame is subjected to an impact force and is to be plastically deformed, the plastically deformable range is reduced. That is prevented.

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

Further, near the extending end of the stabilizer bracket, the stabilizer bracket supports a middle 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 applied to the stabilizer at the time of collision of the vehicle, and the impact force is The power is transmitted to the rear part of the sub-side frame through the lower arm connected to the stabilizer and the front part of the sub-side frame that pivotally supports the lower arm.

Therefore, the rear portion of the sub-side frame is more securely plastically deformed, and the energy based on the impact force is more reliably 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 protrude downward from the general portion of the front portion of the side frame to form a projecting portion.

That is, in the case where the lower portion of the front end of each side frame is projected downward as described above, when an impact force is applied to the front portion of the side frame including the protruding portion, the above-mentioned structure is obtained. A moment is generated that causes the front portion of the side frame to face downward, and the front portion of the side frame is simply bent downward, so that the plastic deformation of the front portion of the side frame tends to be suppressed.

However, as shown in the first aspect of the present invention,
Since the front end of the side frame is supported by the stabilizer bracket via the front cross member, the front portion of the side frame is prevented from being bent even when the impact force is received. The shape extending in the direction is kept as it is.

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, so that the front portion of the side frame smoothly plastically moves 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, a strength-reducing portion for reducing the strength of the base portion near the front portion of the sub-frame is formed in the base portion in the longitudinal direction. 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, and the stabilizer bracket moves rearward and downward in the longitudinal direction. It can be plastically deformed smoothly. Also, 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. And, as described above, when the front portion of the side frame and the stabilizer bracket are both plastically deformed and contracted, the strength-reducing portion of the stabilizer bracket is easily bent, so that the strength-reducing portion is centered on the strength-reducing portion. The stabilizer bracket rotates rearward.

For this reason, each of the above-described longitudinal contractions of the front portion of the side frame and the stabilizer bracket,
Due to the rotation of the stabilizer bracket, the extension end of the stabilizer bracket moves substantially horizontally toward the rear.

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

[Brief description of the 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 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]

 DESCRIPTION OF SYMBOLS 1 Automobile 2 Body 3 Body frame 4 Main frame 5 Subframe 6 Suspension 7 Side frame 7a Front end 7b Rear end 7c Midway 7d Front 7e Rear 8 Front cross member 9 Dash cross member 12 Sub side 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 23b Extension end 28 General part 29 Projection 30 Strength reduction part F Impact force

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-237267 (JP, A) JP-A-7-81611 (JP, A) JP-A-6-270838 (JP, A) JP-A-3-3 112788 (JP, A) JP-A-4-50084 (JP, A) JP-A-62-178277 (JP, U) JP-A-5-71082 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 21/00 B62D 25/20

Claims (3)

(57) [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 the front-rear direction, a front cross member connecting front ends of these side frames to each other, and a rear end of both side frames. A dash cross member that is coupled to each other, a sub-frame that constitutes the front part of the vehicle body and that is provided below the main frame and that extends in the front-rear direction; A coupling frame coupled to the side frame, a stabilizer is provided at the front of each of the sub-side frames so as to pivotably pivot the lower arms, respectively, and connects the lower arms to each other. A stabilizer bracket that protrudes and supports the middle part in the longitudinal direction of the stabilizer In the vehicle body front structure of the provided automobile, it is projected to the coupling frame to the front of each sub-side frame, ibid rear rear end of each side frame of each sub-side frame, also properly the dash cross member The stabilizer bracket is extended forward and upward from the front side of the subframe, and the extended end thereof is coupled to the front cross member. Near the extended end of the stabilizer bracket, the stabilizer bracket is provided. A vehicle body front structure in which a bracket supports a middle part of the stabilizer. 2. The vehicle body front structure according to claim 1, wherein a lower portion of a front end of each side frame is formed to protrude downward from a general portion of a front portion of the side frame to form a protruding portion. 3. The stabilizer bracket according to claim 1, wherein a strength-reducing portion for reducing the strength of the base near the front portion of the sub-frame is formed in the base of the stabilizer bracket. Car body front structure.