JPH11157468A - Front part body structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automobile front part body structure that is able to sufficiently absorb any collisional load even against a car collision, and also to secure an effective living space in a cabin, besides excellent in safety. SOLUTION: In this front part body structure which has a pair of front frames 10A and 10B opposedly installed extending over the underside of a cabin floor 13 from a radiator panel 11 via an engine room, and installing an engine cross member 12 in space between both these front frames 10A and 10B in an intermediate part between the radiator panel 11 and the cabin floor 13, it is also provided with a U-shaped frame 15 where each tip is connected to both sides of the radiator panel 11, while its base end is connected to a central part of the engine cross member 12, and a V-shaped frame 16 whose front end is connected to the central part of the engine cross member 12, while the rear end is connected to each cabin floor lower part of both the front frames 10A and 10B, respectively.

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 an automobile, and more particularly to a front body structure of an automobile which is excellent in safety against full lap and offset frontal collision.

[0002]

2. Description of the Related Art A front body structure of an automobile has been conventionally developed to improve occupant safety against full lap and offset head-on collisions.

[0003] Such a vehicle body structure is disclosed, for example, in Japanese Patent Application Laid-Open No. 8-142910. This technology is shown in FIG.
Has left and right front frames 22 and 23, and a subframe 25 that is installed between the front frames 22 and 23 and supports the engine 24.
Has two connection frames 25A and 25B that are connected to the left and right front frames 23 and 24 in a crossed manner crossing each other.

The vehicle body frame 21 having such a structure
Is that the connecting frames 25A and 25B deform the entire body frame 21 in response to a collision load, and effectively absorb the collision load, in other words, the collision energy.

Another example is disclosed in Japanese Utility Model Laid-Open No. 4-554.
No. 76 publication. In this technique, as shown in FIG.
A pair of front frames 26A and 26B of an automobile,
A front cross member 27A and a rear cross member 27B are provided between the front frames 26A and 26B, and an engine support member 28 is formed at a position defined by the front cross member 27A and the rear cross member 27B.

The engine support member 28 has a base 28A joined to the rear cross member 27B, a joint between the front frame 26A and the front cross member 27A, and a vicinity of a joint between the front frame 26B and the front cross member 27A. Each has a pair of overhangs 28B joined together.

The engine support member 28 having such a structure is joined at a plurality of locations by using the base portion 28A and the pair of overhang portions 28B to secure a reinforcing function against a collision load.

[0008]

SUMMARY OF THE INVENTION The above-mentioned JP-A-8-14 is disclosed.
According to Japanese Patent No. 2910, the subframe for supporting the engine is composed of two connecting frames that connect the left and right front frames so as to intersect with each other, so that the entire body frame is deformed against the collision load to absorb the collision energy. It is configured to be.

On the other hand, according to Japanese Utility Model Laid-Open Publication No. 4-55476, reinforcement against a collision load is performed by an engine support member connecting between a front cross member and a rear cross member provided between a pair of front frames.

However, since the collision energy is configured to be absorbed by deformation of each member including the front frame, the front frame deforms and enters the vehicle compartment,
This may affect the securing of effective living space in the passenger compartment, and in a vehicle body structure that has a front frame that extends from the front of the vehicle body and is connected to the lower surface of the vehicle floor through a bent portion, it is effective in absorbing collision energy. In order to balance the securing of living space, the size of the front frame has to be increased and the cost has been increased.

Accordingly, an object of the present invention in view of the above point is to sufficiently absorb a collision load against a full lap and offset frontal collision without increasing the size of the vehicle body,
Moreover, it is an object of the present invention to provide a vehicle body structure of a front part of a vehicle which is excellent in safety and can secure an effective living space in a vehicle compartment.

[0012]

According to a first aspect of the present invention, a radiator panel for supporting a radiator on a front portion of a vehicle body is provided on a lower surface of a vehicle floor via an engine room in a front-rear direction of the vehicle body. A front portion of an automobile having a pair of front frames disposed so as to face each other and an engine cross member that is mounted between the pair of front frames at an intermediate portion between the radiator panel and the vehicle cabin floor and on which an engine is mounted. In the vehicle body structure, a collision force absorption / dispersion means for transmitting and dispersing the collision load to the engine cross member while absorbing the collision load acting on the radiator panel at the time of a head-on collision; and While transmitting and dispersing to the lower part of the cabin floor of the pair of front frames, the engine cross And having a collision force distributed reinforcement means for supporting the Nba.

According to the first aspect of the present invention, at the time of a head-on collision, the gap between the radiator panel and the engine is effectively used as a so-called idle running part, and the collision load is dispersed by the deformation of the collision force absorbing and dispersing means. The collision load, which is sufficiently absorbed and transmitted to the engine cross member by the collision force dispersion reinforcing means, is transmitted and dispersed to the lower portion of the cabin floor of the pair of front frames, so that the space between the engine cross member and the cabin can be reduced. In this case, the deformation of the front frame in the vehicle is suppressed to prevent the front frame from entering the cabin to secure an effective living space in the cabin.

According to a second aspect of the present invention, in the front body structure according to the first aspect, the collision force absorbing / dispersing means is a crushable structure provided between a radiator panel and an engine cross member. The collision force dispersion reinforcing means is constituted by a non-crushable structure having a higher strength than at least the crushable structure provided between an engine cross member and a lower portion of a cabin floor of a front frame. By
The invention described in claim 1 can be easily implemented.

According to a third aspect of the present invention, in the vehicle body structure of a front part according to the second aspect,
The crushable structure is characterized in that a front portion is coupled below a coupling portion between the radiator panel and the front frame, and is arranged substantially linearly with the non-crushable structure in a side view.

According to the third aspect of the present invention, since the crushable structure is connected to the radiator panel below the front frame, deformation of the crushable structure during a collision is ensured, and absorption of collision energy is ensured. .

According to a fourth aspect of the present invention, in the front structure of the vehicle according to the second aspect, the crushable structure has a front end connected to both sides of a radiator panel and a base end connected to the engine. The front end of the non-crushable structure is connected to a substantially central portion of the engine cross member in the vehicle width direction, and the rear end of the non-crushable structure is a cabin of each of the front frames. It is characterized by being connected to the lower part of the floor.

According to the fourth aspect of the present invention, each of the front ends of the crushable structure is connected to both sides of the radiator panel, and the base end is connected to a substantially central portion of the engine cross member in the vehicle width direction. The front end of the crushable structure is connected to a substantially central portion of the engine cross member in the vehicle width direction, and the rear end is connected to the lower part of the cabin floor of each of the front frames. The body holds the engine cross member to avoid deformation of the cabin and ensures the deformation of the non-crushable structure, that is, the absorption of collision energy.

According to a fifth aspect of the present invention, in the vehicle body structure of the front part of the third aspect, the crushable structure is a U-shaped frame opened forward of the vehicle body, and the non-crushable structure is And a V-shaped frame which is open to the rear of the vehicle body.

According to a fifth aspect of the present invention, a crushable structure can be constructed with a U-shaped frame, and a non-crushable structure can be constructed with a V-shaped frame. Can be easily realized.

According to a sixth aspect of the present invention, in the vehicle front structure according to the third aspect, the crushable structure is a Y-shaped frame opened forward of the vehicle body, and the non-crushable structure is rearward of the vehicle body. A V-shaped frame which is open to the user.

According to a sixth aspect of the present invention, a crushable structure can be constructed with a Y-shaped frame, and a non-crushable structure can be constructed with a V-shaped frame. Can be easily realized.

According to a seventh aspect of the present invention, in the vehicle front structure according to the fifth or sixth aspect, the section modulus of the crushable structure is set smaller than that of the non-crushable structure. It is characterized by that.

Accordingly, since the crushable structure has a small sectional modulus, it is easy to buckle and is improved in crushability, while the non-crushable structure has a high sectional modulus, so that the rigidity is increased and the collision load can be absorbed and the vehicle interior can be reduced. Secure living space is ensured.

According to an eighth aspect of the present invention, in the front frame, a lower portion of the cabin floor is connected to a lower surface of the cabin floor via a bent portion, and the engine cross member is located forward of the vehicle body from the bent portion. The present invention is more effectively implemented by being applied to a vehicle body structure having a front frame having a bent portion easily deformed by a collision load, characterized by being mounted on a frame.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a vehicle body structure for a front part of an automobile according to the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the body structure of an automobile, and FIG. 2 is a side view showing the body structure of the automobile.

The front body structure of the automobile has a pair of front frames 10A and 10B for constructing the body frame 10, a radiator panel 11, and an engine cross member 12.

The front ends 10Aa and 10Ba of the front frames 10A and 10B are connected near both ends of a lower portion of a radiator panel 11 which supports a radiator disposed in front of the vehicle body.

The front frames 10A, 10Ba having front ends 10Aa, 10Ba connected to a radiator panel 11 are provided.
0B are arranged to face each other along the longitudinal direction of the vehicle body,
The rear ends 10Ab and 10Bb are extended to the vehicle cabin floor 13 via the lower portion of the engine room, and each of the rear ends 10Ab and 10Bb extends through a front portion of the vehicle cabin floor 13, that is, a bent portion A that is bent along the lower surface of the toeboard. It is connected to the lower surface of the passenger compartment floor 13.

The engine cross member 12 is provided between the front frame 10A and the front frame 10 at an intermediate portion between the radiator panel 11 and the cabin floor 13.
B, and a power unit such as an engine 17 is mounted on the engine cross member 12.

The thus constructed vehicle body frame 10 is provided with a crushable structure serving as collision force dispersing means and a non-crushable structure serving as collision force dispersing means.

When a frontal collision such as a full wrap collision or an offset collision occurs, the crushable structure sufficiently absorbs the collision load acting on the radiator panel 11, in other words, the collision energy while sufficiently absorbing the collision energy with deformation such as buckling. To the engine cross member 12.

The crushable structure is constructed of a U-shaped frame 15 having an open shape on the radiator panel 11 side, as shown in FIG.
Consisting of continuously formed curved members 15A and 15B, front ends 10Aa and 1A of front frames 10A and 10B are formed.
0Ba, the front ends 15a and 15b are connected near the lower sides of the radiator panel 11, and the base end 15c.
Are connected to a central portion of the engine cross member 12.

These connections are made by connecting the U-shaped frame 15 to the lower surface of the radiator panel 11 and the engine cross member 12
When a fastening member such as a bolt or a nut or a welding member is attached to the lower surface of the vehicle, and the fastening member is used for connection, in order to suppress vibration from the engine 17, a vibration preventing member such as a rubber bush is used. Is used for the gap between the fastening member and the member to be fastened.

The non-crushable structure is constructed of a V-shaped frame 16 having an open shape on the passenger compartment floor 13 side.
The V-shaped frame 16 is composed of linear members 16A and 16B formed continuously with each other, and has a front end 16c connected to a central portion of the engine cross member 12 and a rear end 1c.
6a and 16b are connected to the vehicle compartment floor lower portions 10Bc and 10Ac of the front frames 10B and 10A, respectively, bypassing the bent portion A, respectively.

Further, the sectional modulus of the V-shaped frame 16 is set to be larger than that of the U-shaped frame 15 which is the crushable structure 15. That is, in the V-shaped frame 16, the rigidity is increased and the mechanical strength is increased. On the contrary, in the U-shaped frame 15, the section modulus is small, the buckling deformation is relatively easy, and the crushability is enhanced.

Next, the operation of the thus constructed front body structure will be described.

First, the case of a full lap collision will be described. The load due to the collision is applied to the front ends 15a and 15b of the crushable U-shaped frame 15 and the front frames 10A and 10B via the radiator panel 11 on the front part of the vehicle body. It is input to the front ends 10Aa and 10Ba.

With the input of the impact load, the bending members 15A and 15B of the U-shaped frame 15 and the front frame 1
The front ends 10Aa, 10Ba to the vicinity of the front ends of 0A and 10B buckle and absorb impact energy.

The bending loads 15A, 15B of the U-shaped frame 15 and the front frames 10A,
If sufficient impact energy cannot be achieved due to the buckling deformation of the front ends 10Aa, 10Ba and the vicinity of the front ends of the front cross section 0B, the collision load is transmitted to the central portion of the engine cross member 12 by the U-shaped frame 15, The rear ends 16a, 1B, 10B and 10Ac of the front frames 10B and 10A are bypassed to the bend A, respectively.
6b is received by the engine cross member 12 firmly supported by the V-shaped frame 16 composed of the linear members 16A and 16B supported, and the collision load is received by the engine cross member 12, the V-shaped frame 16 and the like. Etc.

At this time, the collision load input to the engine cross member 12 bypasses the bent portions A of the front frames 10A and 10B by the V-shaped frame 16 and directly goes to the lower part of the vehicle floor of the front frames 10B and 10A. Since the transmission to the 10Bc and 10Ac, the deformation of the bent portion A is avoided or the amount of the deformation is extremely small, and the intrusion into the vehicle interior of the front frames 10A and 10B is avoided, and the effective living space in the vehicle interior is maintained and safety is maintained. In addition to ensuring the performance, it is possible to more reliably absorb the collision energy due to the buckling deformation of the U-shaped frame 15 or the like.

Next, the case of an offset collision will be described with reference to FIGS.

FIGS. 3 and 4 are schematic plan views for explaining the deformation of each part accompanying the offset collision of the front body structure at each collision stage, and FIG. 5 is a schematic side view of FIG.

As shown in FIGS. 3 and 5, for example, when an offset deformable barrier (ODB) 20 collides with the left side of the vehicle body frame 10, in other words, on the front end 10Ba side of the front frame 10B, the collision load is reduced. U through the radiator panel 11 at the front
The load is input to the bending member 15A from the distal end 15a of the bending member 15A of the V-shaped frame 15, and the load is applied via the engine cross member 12 and the linear member 16B of the V-shaped frame 16 to the lower part 10A of the front floor 10A of the passenger compartment floor.
c, the bending member 15A buckles and deforms to absorb the collision energy, and also absorbs the impact energy due to the buckling deformation near the front end portion 10Ba to the front end portion of the front frame 10B.

At this stage, deformation of the engine cross member 12 is avoided by reinforcing the mechanical strength of the engine cross member 12 itself and the mechanical strength of the V-shaped frame 16 with respect to the engine cross member 12, and conversely, the bending of the engine cross member 12 is prevented. Since the radiator lower panel 11 is firmly supported by the vehicle floor lower portion 10Ac of the front frame 10A via the member 15A and the linear member 16B, the lower part of the offset deformable barrier 20 can be effectively crushed. This phenomenon induces crushability on the colliding side, and can also promote the absorption of the collision energy on the colliding side.

As shown in FIG. 4, the collision energy that is strong and cannot be absorbed by the buckling deformation of the U-shaped frame 15 retreats the engine 17, the exhaust pipe, etc. (not shown), and The information is transmitted to the member 12. The collision force transmitted to the engine cross member 12 is received by the lower portions 10Ac, 10Bc of the vehicle interior floors of the front frames 10A, 10B via the V-shaped frame 16 composed of the linear members 16A, 16B. The transmission is distributed to 10B.

At this time, the collision load inputted to the engine cross member 12 bypasses the bent portions A of the front frames 10A and 10B by the V-shaped frame 16 and directly goes to the lower part of the cabin floor of the front frames 10B and 10A. Since the transmission to the 10Bc and 10Ac, the deformation of the bent portion A is avoided or the amount of the deformation is extremely small, and the intrusion into the vehicle interior of the front frames 10A and 10B is avoided, and the effective living space in the vehicle interior is maintained and safety is maintained. In addition to ensuring the performance, it is possible to more reliably absorb the collision energy due to the buckling deformation of the U-shaped frame 15 or the like.

As described above, in the vehicle body structure of the front part of the automobile according to the present embodiment, when one of the full lap collision and the offset collision occurs,
Radiator panel 11 arranged immediately before engine 17
The idle running portion between the U-shaped frame 15 and the engine cross member 12 is effectively used as a collision absorbing area.
As a result, the collision energy is sufficiently absorbed.

Further, in the front body structure of the automobile according to the present embodiment, a crushable structure can be constructed by the U-shaped frame 15 and a non-crushable structure can be constructed by the V-shaped frame 16. Both the crushable structure and the non-crushable structure can be easily realized.

Further, since the U-shaped frame 15 serving as a crushable structure has a small sectional modulus, it is easy to buckle and improve crushability, and the V-shaped frame 16 serving as a non-crushable structure has a small sectional modulus. High rigidity is increased.

Next, a second embodiment according to the present invention will be described with reference to FIG.
It will be explained by. In FIG. 6, the same reference numerals are given to the portions corresponding to FIGS. 1 to 5, and the detailed description is omitted.

FIG. 6 is a plan view corresponding to FIG.
In the vehicle front body structure shown in FIG. 6, the crushable structure is constructed by a Y-shaped frame 18 having a shape opened toward the radiator lower panel 11 side.

The Y-shaped frame 18 comprises a linearly formed first member 18A, a second member 18B and a third member 18C which are integrally formed.
B, the front ends 18 of the first member 18A and the second member 18B near both lower sides of the radiator panel 11 near the front end.
a and 18b are connected to each other and the base end 1 of the third member 18C is
8c is connected to the central portion of the engine cross member 12.

These connections are performed by attaching the Y-shaped frame 18 to the lower surface of the radiator panel 11 and the lower surface of the engine cross member 12, respectively, by fastening members such as screws, bolts and nuts, or by welding. In this case, a vibration preventing member such as a rubber bush is used in the gap between the fastening member and the member to be fastened in order to suppress the vibration from the engine 17.

Further, the sectional modulus of the Y-shaped frame 18 is set smaller than the sectional modulus of the V-shaped frame 16.
That is, in the V-shaped frame 16, the rigidity is increased and the mechanical strength is enhanced. On the contrary, in the Y-shaped frame 18, the section modulus is small, the buckling deformation is relatively easy, and the crushability is enhanced.

In the vehicle body structure of the front part thus configured, the same operation and effect as those of the first embodiment can be obtained, and the size of the crushable structure in the vehicle width direction can be further reduced. can get.

In the first embodiment, the U-shaped frame 15 is connected to the continuously formed curved members 15A and 15A.
In the first and second embodiments, the V-shaped frame 16 is constituted by the linear members 16A and 16B which are continuously formed with each other. However, it is also possible to divide each of the linear members 16A and 16B, and the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the invention.

[0059]

According to the front body structure of the automobile according to the present invention described above, the collision load is sufficiently absorbed by the collision force absorbing and dispersing means at the time of a head-on collision, and further transmitted to the engine cross member by the collision force dispersing reinforcing means. By transmitting and dispersing the applied collision load to a lower portion of the cabin floor of the pair of front frames, deformation of the front frame between the engine cross member and the cabin is suppressed, thereby preventing the front frame from entering the cabin. An effective living space in the room can be ensured, which greatly contributes to improving the safety of automobiles.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a first embodiment of a front body structure according to the present invention.

FIG. 2 is a side view showing the outline of FIG. 1;

FIG. 3 is a schematic plan view illustrating a deformation operation at the time of an offset collision.

FIG. 4 is a schematic plan view illustrating a deformation operation at the time of an offset collision.

FIG. 5 is a schematic side view for explaining a deformation operation at the time of an offset collision.

FIG. 6 is a plan view illustrating a second embodiment of the front body structure according to the present invention.

FIG. 7 is a configuration diagram showing a conventional vehicle front body structure.

FIG. 8 is a configuration diagram showing a conventional front body structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Body frame 10A Front frame 10B Front frame 11 Radiator panel 12 Engine cross member 13 Cabin floor 15 U-shaped frame 16 V-shaped frame 18 Y-shaped frame

Claims (8)

[Claims] 1. A pair of front frames disposed opposite to each other from a radiator panel supporting a radiator on a front part of a vehicle body to a lower surface of a vehicle floor via an engine room in a front-rear direction of the vehicle body, and the radiator panel and the vehicle room In a front body structure of an automobile having an engine cross member that mounts an engine between the pair of front frames at an intermediate portion with a floor, the vehicle body absorbs a collision load acting on the radiator panel during a frontal collision. A collision force absorbing / dispersing means for transmitting / dispersing a collision load to the engine cross member; and transmitting / dispersing the collision load transmitted / distributed to the engine cross member to a lower portion of a cabin floor of the pair of front frames, while And a collision force dispersion reinforcing means for supporting the cross member. The front body structure of the car. 2. The collision force absorption / dispersion means comprises a crushable structure provided between a radiator panel and an engine cross member. The collision force distribution / reinforcement means comprises a vehicle having an engine cross member and a front frame. 2. The front body structure of an automobile according to claim 1, wherein the non-crushable structure is higher in strength than at least the crushable structure provided between the lower portion of the room floor and the crushable structure. 3. The crushable structure has a front portion connected below a connection portion between the radiator panel and the front frame, and is arranged substantially linearly with the non-crushable structure in a side view. The vehicle body structure of a front part of an automobile according to claim 2, wherein 4. The crushable structure has a front end connected to both sides of a radiator panel and a base end connected to a substantially central portion of an engine cross member in a vehicle width direction. 4. The vehicle according to claim 3, wherein a front end is connected to a substantially central portion of the engine cross member in a vehicle width direction, and a rear end is connected to a lower portion of a cabin floor of each of the front frames. Front body structure. 5. The crushable structure is a U-shaped frame opened to the front of the vehicle body, and the non-crushable structure is a V-shaped frame opened to the rear of the vehicle body. 4. The vehicle body structure of a front part of the vehicle according to 3. 6. The crushable structure is a Y-shaped frame opened to the front of the vehicle body, and the non-crushable structure is a V-shaped frame opened to the rear of the vehicle body. 4. The vehicle body structure of a front part of the vehicle according to 3. 7. The vehicle body structure according to claim 5, wherein a sectional modulus of the crushable structure is set smaller than a sectional modulus of the non-crushable structure. . 8. The front frame, wherein a lower portion of the cabin floor is connected to a lower surface of the cabin floor through a bent portion, and the engine cross member is provided between the front frames at a position forward of the vehicle body from the bent portion. The vehicle body structure of a front part of an automobile according to any one of claims 1 to 7, wherein: