JP2003081130A - Body structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain deformation of a compartment by efficient load dispersion throughout a compartment floor at the time of collision. SOLUTION: At a lower face side of a front floor 2, a compartment protection cell structure Z of a substantially rectangular shape with high strength and stiffness is constituted of a pair of side sills 4 and center members 5, a second cross member 6 which combines them in a car width direction, and an engine 11 and a fuel tank 12 of unit components. Thus, deformation of a compartment C can be restrained by dispersing and supporting an input from a front compartment F.C throughout the cell structure Z at the time of front collision.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an automobile body structure.

[0002]

2. Description of the Related Art Some automobiles include, for example, Japanese Patent Laid-Open No. 2000-
As disclosed in Japanese Patent No. 168628, it is known that a battery frame for mounting and storing a battery is arranged on the lower surface side of a vehicle body floor, and the battery frame is made to function as a reinforcing member on the side surface of the vehicle body. There is.

[0003]

However, in the above-mentioned conventional structure, although the reinforcing effect by the battery frame can be obtained against the side collision of the vehicle, the battery frame is not affected by the collision input from the longitudinal direction of the vehicle. If measures such as increasing the wall thickness are taken, the weight of the vehicle will increase.

In view of the above, the present invention provides a vehicle body structure capable of efficiently performing load distribution on the entire passenger compartment floor at the time of a vehicle collision without increasing the weight of the vehicle and suppressing deformation of the passenger compartment. It is provided.

[0005]

According to a first aspect of the present invention, there is provided a vehicle body structure in which unit constituent parts of a vehicle are mounted in a lower portion of a floor of a vehicle compartment, and the vehicle is provided on both sides of the floor in a vehicle width direction. A pair of side sills extending in the front-rear direction, a center bum bar extending in the vehicle front-rear direction on the lower surface of the center of the floor in the vehicle width direction, and a vehicle width direction extending on the lower surface near the front end of the floor. In the event of a collision, a cross member that is arranged to connect the center member and the side sill and a rigid unit component that is capable of mutually transmitting force between at least one of the side sill and the center member are used. The vehicle interior protection cell structure having a substantially rectangular plane shape that suppresses the deformation of the vehicle interior is formed.

According to a second aspect of the present invention, there is provided a vehicle body structure according to the first aspect, which is located in front of the passenger compartment and which absorbs energy by being deformed by a frontal collision. A substantially rectangular energy absorption cell structure, and a plane that is located between the energy absorption cell structure and the vehicle interior protection cell structure and that transmits an input from the energy absorption cell structure to the vehicle interior protection cell structure during a frontal collision. And a substantially rectangular input transmission cell structure.

According to a third aspect of the present invention, there is provided the vehicle body structure according to the second aspect, wherein the energy absorbing cell structure is arranged on both sides in the vehicle width direction of the front compartment so as to extend in the vehicle longitudinal direction. And a pair of front side members whose rear ends are joined to the dash panel, a first cross member which is arranged to extend in the vehicle width direction by connecting the front ends of the pair of front side members, and the dash panel And a dash cross member that extends in the vehicle width direction at the lower part of and connects the rear end portions of the pair of front side members to each other.

According to a fourth aspect of the present invention, in the vehicle body structure according to the third aspect, the input transmission cell structure extends from the rear end of each front side member to the lower surface side of the dash panel. A pair of extension side members that are arranged to extend toward the rear of the vehicle and connect each front side member to the cross member and the side sill, the dash cross member, the cross member, and the dash of the center member. And a front end portion that connects the cross member and the cross member.

According to a fifth aspect of the present invention, there is provided the vehicle body structure according to the fourth aspect, in which a portion around the joint between the side sill and the extension side member and a portion around the unit component mounting portion of the center member are provided. It is characterized in that each is reinforced with a nut plate for fastening and fixing, and the unit constituent parts are attached to these reinforced portions via a mount member or a bracket integrated with the unit constituent parts.

According to a sixth aspect of the invention, there is provided the vehicle body structure according to the fifth aspect, wherein the mount member comprises:
A vehicle-body-side bracket that is fixed to the vehicle body side and includes a pair of front and rear parallel support walls that are substantially orthogonal to the axle, an inner cylinder that is approximately the same width as the width between the pair of support walls, and a space between the support walls. A unit-side bracket fixed to the unit side via a stay provided in the outer cylinder, comprising a vibration-proof bush made of an outer cylinder shorter than the width and a vibration-proof rubber connecting the inner and outer cylinders to each other. When,
A connecting shaft that connects the support wall and the inner cylinder by penetrating the support wall and the inner cylinder of the vibration prevention bush in the front-rear direction in a state where the vibration prevention bush is inserted between the pair of support walls of the vehicle body side bracket. It is characterized by being composed of and.

According to a seventh aspect of the present invention, there is provided the vehicle body structure according to the sixth aspect, wherein the vehicle body side bracket is formed in conformity with an outer shape around a joint portion between the extension side member and the side sill. It is characterized in that it is externally fitted around the joint portion and fastened and fixed.

According to an eighth aspect of the present invention, in the vehicle body structure according to the fourth aspect, a connecting member is provided in the vehicle width direction across the connecting portion between the extension side member and the side sill and the center member. Is fixed, and the unit component is attached to the connecting member via a mount member or a bracket integrated with the unit component.

According to the invention of claim 9, claims 3 to 8 are provided.
The vehicle body structure of the automobile according to 1, wherein a subframe is coupled and arranged below the energy absorption cell structure across the first cross member and the cross member, and a drive motor and a front suspension are mounted on the subframe. It is characterized by being installed.

According to a tenth aspect of the invention, there is provided the vehicle body structure according to the ninth aspect, wherein the front end portion connecting the dash cross member and the cross member of the center member is inclined rearward and downward. It is characterized by the provision of a section.

According to the invention of claim 11, claim 10 is provided.
The vehicle body structure according to claim 1, wherein a reinforcing member that is inclined along the inclined portion is disposed in the cross section of the inclined portion, and a space portion is provided between the lower surface of the inclined portion and the lower surface of the reinforcing member. Is formed.

According to the invention of claim 12, claim 11 is provided.
In the vehicle body structure of the automobile described in 1), the lower surface of the reinforcing member is formed so as to substantially match the outer shape of the drive motor so that the drive motor can be received when the drive motor moves backward. Is characterized by.

According to the invention of claim 13, claims 3 to
13. The vehicle body structure according to 12, wherein a frame member is joined and arranged in the front-rear direction along the dash panel surface above the front end portion of the center member to form a closed cross section. .

According to the invention of claim 14, claim 1
13. The vehicle body structure according to item 13, wherein the unit component is an engine or a fuel tank.

[0019]

According to the first aspect of the present invention, a pair of side sills and a center member are provided on the lower surface side of the floor of the vehicle compartment, and a cross member and a unit component for connecting the side sills and the center member to each other in strength and rigidity. Since the vehicle compartment protection cell structure is a substantially rectangular plane, the input from the front compartment at the time of a frontal collision can be dispersed and supported by the entire vehicle compartment protection cell structure, and it is also mounted on the lower side of the floor. Since the unit component parts described above are effectively used as a part of the cell structure, it is possible to suppress the increase in the number of parts and obtain the cost and weight advantages.

According to the invention of claim 2, claim 1
In addition to the effect of the invention, the input acting on the energy absorption cell structure at the time of a frontal collision is efficiently transmitted to the vehicle interior protection cell structure having high strength and rigidity by the input transmission cell structure having a substantially rectangular plane, While the vehicle interior protection cell structure can be more efficiently dispersed and supported, the vehicle interior protection cell structure and the input transmission cell structure can enhance the crushing reaction force of the energy absorption cell structure and can flatten the energy absorption cell structure. Since it has a substantially rectangular shape, it is possible to efficiently crush and deform the front compartment as a whole to absorb energy.

Therefore, the front compartment can be clearly divided into the collapsed region and the vehicle compartment can be clearly divided into the protection region, so that the energy absorption effect and the vehicle interior protection effect can be further enhanced.

According to the invention of claim 3, claim 2
In addition to the effects of the invention described above, in the vehicle width direction at the front end portion of the floor that has an energy absorbing cell structure that is a skeletal member that also serves as a main energy absorbing member of the front compartment and a first cross member, and a reaction force supporting member. Since it is composed of the dash cross member which is a skeleton member, it is possible to obtain an energy absorption cell structure capable of stable energy absorption without the addition of dedicated parts.

According to the invention of claim 4, claim 3
In addition to the effect of the invention described above, the collision input acting on the input transfer cell structure from the energy absorption cell structure is efficiently transferred from the dash cross member constituting the input transfer cell structure to the extension side member and the center member front end portion and the cross member. Since the input transmission cell structure can be dispersed and can be substantially evenly distributed and transmitted to the side sill and the center member, which are main skeleton members in the front-rear direction of the passenger compartment floor constituting the passenger compartment protection cell structure, The load transmission performance can be improved.

According to the invention of claim 5, claim 4
In addition to the effects of the invention, since the surroundings of the unit component mounting portion in the vehicle interior protection cell structure can be reinforced in a wide range by the nut plate for fastening and fixing, it is possible to prevent local deformation and to prevent side deformation. Since the joint rigidity with the extension side member can be increased, a stronger vehicle compartment protection cell structure can be constructed.

According to the invention of claim 6, claim 5
In addition to the effect of the invention described above, the mount member can prevent the transmission of vibration from the unit structural component to the vehicle body side. Due to the bending deformation of the anti-vibration rubber, the outer cylinder interferes with the pair of support walls of the vehicle body side bracket to reliably transmit the load, so that both the sound vibration performance during normal use and the input transmission function during a collision can be achieved. As a result, the structure for utilizing the unit constituent parts as the input transmission frame member can be simplified and reduced in weight.

According to the invention of claim 7, claim 6
In addition to the effect of the invention described above, the joint portion between the side sill and the extension side member can be reinforced to enhance the load distribution supporting performance of the vehicle compartment protection cell structure, and the bracket on the vehicle body side of the mount member is effective as a reinforcing material. Since it is used, the number of parts does not increase, and it is possible to obtain an advantage in terms of cost and weight.

According to the invention described in claim 8, claim 4
In addition to the effect of the invention described above, since the load is directly transmitted between the side sill and the center member by the connecting member for mounting the unit component parts, it is possible to enhance the load distribution supporting performance of the vehicle interior protection cell structure.

According to the invention of claim 9, claim 3
In addition to the effects of the inventions of 8 to 8, since the drive motor and the front suspension, which are rigid parts, are attached to the sub-frame, the axial crush deformation behavior from the front end to the rear region of the front side member at the time of a frontal collision is prevented. These rigid parts do not have an adverse effect, the crush stroke of the front compartment can be enlarged, and the energy absorption effect can be enhanced.

According to the invention of claim 10, in addition to the effect of the invention of claim 9, when the drive motor moves backward when the front compartment is crushed and deformed, the drive motor moves to the front end portion of the center member. By interfering with the slanted portion, a downward and rearward drop guide action is obtained at the slanted portion, the deformation of the vehicle interior due to the backward movement of the drive motor can be prevented, and the crush stroke of the front compartment can be further expanded. it can.

According to the eleventh aspect of the invention, in addition to the effect of the tenth aspect of the invention, when the drive motor interferes with the lower surface of the inclined portion, the lower surface is deformed in the space portion to cause an impact. When the lower surface is bottomed in the space, the reinforcing member can suppress the backward movement of the driving motor and guide the falling downward.

According to the twelfth aspect of the invention, in addition to the effect of the eleventh aspect of the invention, when the drive motor bottoms out, the lower surface of the reinforcing member appropriately receives the drive motor to regulate the backward movement. As a result, a downward drop guide action can be performed.

According to the thirteenth aspect of the invention, in addition to the effects of the third to twelfth aspects of the invention, a closed cross section formed by the frame member in the front-rear direction is located above the front end of the center member on the dash panel surface. By extending, the strength of the bent portion where the dash panel and the floor are connected to each other from the front is increased, the collision input from the front compartment can be reliably supported, and the drive motor mounted in the front compartment, etc. It is possible to more reliably perform the downward and backward drop guide action by the front end of the center member at the time of retreating.

According to the fourteenth aspect of the present invention, in addition to the effects of the first to thirteenth aspects, since the engine or the fuel tank is used as a unit component constituting the vehicle interior protection cell structure, the input transmission is performed. Sufficient rigidity can be obtained as a frame member, and the load distribution and transmission performance in the vehicle interior protection cell structure can be further improved.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings by taking a hybrid vehicle as an example.

FIG. 1 is an external perspective view of an automobile targeted by the present invention, and FIG. 2 is a perspective view of the lower skeleton structure of the automobile shown in FIG.

In FIGS. 1 and 2, the dash panel 1 that separates the front compartments F and C from the passenger compartment C is a vertical wall 1a and an inclination that continues to the lower side of the vertical wall 1a as shown in FIG. The toe board portion 1b described above is provided, and the lower end portion of the toe board portion 1b is joined to the front end portion of the front floor 2 that constitutes the floor of the vehicle interior C.

The front floor 2 is formed with a storage portion 3 that bulges toward the passenger compartment C on the front seat arrangement portion, and the left and right sides of the front floor 2 are formed into a closed cross section with sill inner and sill outer. The side sill 4, which is one of the floor skeletal members extending in the vehicle front-rear direction, is joined and arranged. Figure 2
Then, only the sill inner of the side sill 4 is shown.

At the center of the lower surface of the front floor 2 in the vehicle width direction, a center member 5 extending in the front-rear direction across the storage portion 3 is arranged, and at the lower surface near the front end of the floor. A second cross member 6 as a cross member that extends in the vehicle width direction and connects the center member 5 and the pair of side sills 4, 4 is provided.

The center member 5 and the second cross member 6 are both formed in an inverted hat-shaped cross section, and form a closed cross section together with the front floor 2.

The end portions of the second cross member 6 in the vehicle width direction are specifically butted and joined to the inner side surfaces of the left and right extension side members 9, 9 described later in the vehicle width direction.

On the lower surface side of the toe board portion 1b of the dash panel 1, a dash cross member 7 constituting a vehicle width direction frame member at the front end of the floor is joined and arranged to form a closed cross section with the toe board portion 1b. There is.

The front end portion of the center member 5 is arranged so as to extend from the second cross member 6 to the front end of the dash cross member 7, and the lower surface of the front end portion is second from the lower surface front edge of the dash cross member 7. The lower surface front edge of the cross member 6 is linearly connected to form an inclined portion 5F.

In the dash panel 1, the rear end portions of the front side members 8 constituting the front-back direction skeletal members of the front compartments F and C are joined to the left and right side portions of the front surface of the dash cross member 7, and From the rear end of the front side member 8 to the dash cross member 7
The extension side members 9 that extend around the lower surface of the vehicle and extend toward the rear of the vehicle are joined and arranged.

The front side member 8 is formed, for example, in a rectangular closed cross section so that it can be deformed by being deformed in the front-rear direction in response to an input acting in the axial direction at the time of a frontal collision to absorb energy.

Similarly, the extension side member 9 is also formed in a closed cross section, but the approximately rear half of the extension side member 9 is gently bent outward in the vehicle width direction and abutted against the side surface of the side sill 4. The second cross member 6 is joined, and the end portion of the second cross member 6 is joined to the extension side member 9 in the vicinity of a bent portion in the vehicle width direction.

The left and right front side members 8, 8 are connected to each other by a first cross member 10 having a closed cross-section structure which forms a vehicle width direction frame member connected across the front end faces thereof.

Then, in the portion where the storage portion 3 is formed, as shown in FIG. 5, the engine 11 and the fuel tank 12 which are rigid unit components are provided across the left and right side sills 4, 4 and the center member 5. , The side sills 4 and the center member 5 are mounted so as to be able to transmit force to each other.

In this embodiment, the engine 11 is mounted between the right side sill 4 and the center member 5 via the mount member 13, and the fuel tank 12 is mounted between the left side sill 4 and the center member 5. It is attached to the shell side portion via a bracket 12A formed integrally.

As a result, a pair of left and right side sills 4, 4 and the center member 5 are provided below the front floor 2.
And a second cross member 6, a pair of left and right extension side members 8, 8 and a rear side portion, and an engine 11 and a fuel tank 12 which are unit components, for suppressing deformation of the vehicle interior C at the time of a collision. A substantially rectangular (day-shaped) vehicle interior protection cell structure Z is configured, and the engine 11 and the fuel tank 12 are made to function as an input transmission skeleton member in the vehicle interior protection cell structure Z.

On the other hand, in the front compartments F and C, the pair of left and right front side members 8 and 8 are provided.
And the first cross member 10 and the dash cross member 7 form an energy absorption cell structure X having a substantially rectangular shape (square shape) that absorbs energy by being deformed by a frontal collision. A dash cross member 7, left and right extension side members 9, 9, a second cross member 6, and a front end portion 5F (inclined portion) of the center member 5 are provided between the cell structure X and the vehicle compartment protection cell structure Z. By this, an input transmission cell structure Y having a substantially rectangular shape (a letter of a plane) for transmitting the input from the energy absorption cell structure X to the vehicle interior protection cell structure Z at the time of a frontal collision is configured.

As shown in FIG. 6, the mount member 13 of the engine 11 includes a vehicle body side bracket 14 fixed to a vehicle body side frame member such as a side sill 4, a center member 5, and the like.
Unit side bracket 15 fixed to the engine 11
And a connecting shaft 1 for connecting both brackets 14 and 15
6 and.

The vehicle body side bracket 14 is integrally formed with a pair of front and rear parallel support walls 14A, 14A which are substantially orthogonal to the axle.

On the other hand, the unit side bracket 15 has an inner cylinder 1 having a length substantially the same as the width between the pair of support walls 14A, 14A.
7a, an outer cylinder 17b shorter than the width between the support walls 14A, 14A, and a vibration-proof bush 17 composed of a vibration-proof rubber 17c connecting the inner and outer cylinders 17a, 17b to each other. It is arranged to be attached to the engine 11 via a stay 15A integrally provided on 17b.

The vehicle body side bracket 14 and the unit side bracket 15 are provided with the vibration isolation bush 17 on the supporting wall 14
These support walls 14A, 1 in the state of being inserted between A, 14A
4A and the inner shaft 17a of the anti-vibration bush 17 to the connecting shaft 16
Are pierced in the front-back direction and connected. This connecting shaft 16
Is a bolt 16 fastened and fixed by a nut 16b.
a is used.

As described above, the engine 11 and the fuel tank 12 are located on the side sill 4 via the mount member 13 and the bracket 12A at a position near the joint between the side sill 4 and the extension side member 9 and at two positions behind it. , And the side sill 4 for the center member 5.
The front and rear mounting positions are attached at two front and rear positions.
As shown in FIG. 4, a nut plate 18 having a required area provided with a nut 18a for fastening and fixing is joined and arranged to reinforce.

The front side mount member 13F disposed at the joint between the side sill 4 and the extension side member 9 has a vehicle body side bracket 14 which has an outer shape around the joint between the side sill 4 and the extension side member 9. It is formed according to the shape, and is fitted around the joint portion and screwed and fastened to the nut 18a by the bolt 19.

Further, in the present embodiment, the subframe 20 is coupled and arranged below the energy absorption cell structure X of the front compartments F and C, straddling the first cross member 10 and the second cross member 6. A drive motor 21 and a front suspension 22 (a suspension arm is shown in FIG. 3) are attached to the subframe 20.

The sub-frame 20 includes left and right side frames 20a and 20b extending in the front-rear direction, and a front frame 20c connecting the side frames 20a and 20b at their front sides.

This sub-frame 20 is a side frame 20.
The front end portions of the a and 20b are fastened and fixed to the lower surface of the first cross member 10 by bolts and nuts at positions offset inward in the vehicle width direction from the front ends of the front side members 8 and 8, and the side frames 20a, 20
The rear end portion of b is fastened and fixed to the lower surface of the second cross member 6 near the joint with the extension side member 9 by means of bolts, nuts or the like.

The drive motor 21 is mounted across the intermediate portion of the side frames 20a, 20b, for example, via the same mount member 13 as described above, and the suspension arm 22 has its front end portion mounted on the mount member 13. The rear end portions of the side frames 20a, 20b
Is fastened and fixed in the vicinity of the fixed point at the rear end. 5 in FIG.
Reference numeral 3 denotes a front wheel attached to the suspension arm 22.

On the other hand, in the closed cross section of the inclined portion 5F at the front end of the center member 5, as shown in FIG.
Reinforcing members 24 that are inclined along F are arranged so as to be joined together, and a space 25 is formed between the lower surface of the inclined portion 5F and the lower surface of the reinforcing member 24.

According to the structure of the first embodiment described above, the pair of left and right side sills 4, 4, the center member 5, and the left and right extension sides are provided on the lower surface side of the front floor 2 which constitutes the passenger compartment floor. A second cross member 6 joined in the vehicle width direction via the rear sides of the members 9, 9 and, similarly, side sills 4, 4 and a center member 5.
Since the engine 11 and the fuel tank 12 which are the unit components that combine with each other form a substantially rectangular plane protective cell structure Z having high strength and rigidity, as shown in FIGS. In both full-lap and offset collisions, the front compartment F
The input F from C can be distributed and supported by the entire passenger compartment protection cell structure Z via the members 4, 5, 6, 9 and the unit components 11 and 12, as well as the side surface. Even in the case of lateral input due to a collision, the load is surely transmitted from one side sill 4 to the center member 5 and the other side sill 4 via the unit components 11 or 12 and the load is dispersed and supported by the entire cell groove Z. Therefore, the deformation of the vehicle interior C can be suppressed as small as possible.

Moreover, the rigid engine 11 and the fuel tank 12 are mounted as unit components mounted on the lower side of the floor.
Is effectively used as a part of the cell structure Z,
Sufficient rigidity can be obtained as an input transmission skeleton member to improve load distribution transmission performance in the vehicle interior protection cell structure Z, suppress the increase in the number of new items, and protect the vehicle interior C in terms of cost and weight. Can be done.

Particularly in the present embodiment, the nut plate for fastening and fixing around the connecting portion of the side sill 4 and the extension side member 9 and around the unit component mounting portion of the center member 5 in a required area. Since the engine 11 is attached to the reinforced portion via the mount member 13 and the fuel tank 12 via the bracket 12A integral with the fuel tank 12, these unit components 11,
It is possible to prevent local deformation of the mounting portion of 12 and increase the joint rigidity between the side sill 4 and the extension side member 9 to form a stronger vehicle compartment protection cell structure Z.

Particularly, at the connecting portion of the side sill 4 and the extension side member 9, the vehicle body side bracket 14 of the mount member 13F of the engine 11 is formed in conformity with the outer shape of this connecting portion and is fitted onto the connecting portion. Since they are fastened and fixed together, the joint portion can be reinforced more strongly without using a dedicated reinforcing material, and the load distribution supporting performance of the vehicle interior protection cell structure Z can be improved in terms of cost and weight. You can

Moreover, the mount member 13 of the engine 11 is provided with the vibration-proof bush 17 of the unit side bracket 15.
Vibration can be prevented from being transmitted from the engine 11 to the vehicle body side by the anti-vibration bush 17 when the engine 11 is displaced in the front-rear direction due to inertial force or the like during a frontal collision.
When the anti-vibration rubber 17c is flexed and deformed as shown in FIG. 6B or 6C, the outer cylinder 17b interferes with the support walls 14A and 14A of the vehicle body side bracket 14 to reliably transmit the load. Therefore, the sound vibration performance during normal use and the input transmission function at the time of collision can be compatible, and the structure for utilizing the engine 11 as the input transmission frame member can be simplified and reduced in weight.

In the front compartments F and C, a pair of left and right front side members 8 and 8, which are skeleton members that also function as main energy absorbing members, a first cross member 10, and a front end portion of the floor that also functions as a reaction force supporting member. An energy absorption cell structure X having a substantially rectangular shape made up of a dash cross member 7 of a skeletal member is configured, and the dash cross member 7 and the extension side member 9 are provided between the energy absorption cell structure X and the passenger compartment protection cell structure Z. , 9, the second cross member 6, and the front end portion (inclined portion 5F) of the center member 5, the input transmission cell structure Y in the shape of a substantially plane in a plane is formed. In either case of the full-wrap collision shown in FIG. 8 or the offset collision shown in FIG. A collision input F acting on the force transmission cell structure Y, the right and left from the dash cross member 7 extension side member 9 and center member front portion 5F
And the second cross member 6 can be efficiently dispersed, and substantially from the input transmission cell structure Y to the left and right side sills 4 and the center member 5 which are the main front-rear direction skeleton members of the front floor 2 constituting the passenger compartment protection cell structure Z. It can be evenly distributed and transmitted, and the load transmission performance to the vehicle interior protection cell structure Z can be improved.

On the other hand, due to the load distribution transmission effect of the vehicle compartment protection cell structure Z and the input transmission cell structure Y,
The crushing reaction force of the energy absorption cell structure X can be increased to smoothly perform axial crushing deformation of the left and right front side members 8, 8 and crushing deformation or bending deformation of the first cross member 10, and a substantially rectangular plane shape. Due to the configuration of the shape, the deforming action of the front side members 8, 8 and the first cross member 10 can be stably performed, and the front compartments F and C
Energy can be absorbed by efficiently crushing and deforming the whole.

Therefore, the front compartments F and C
Can be clearly divided into the collapsed region and the vehicle interior C by the protection region, and the energy absorption effect and the vehicle interior protection effect can be further enhanced.

Further, since the rigid drive motor 21 and the suspension arm 22 are attached to the sub-frame 20, these rigid parts adversely affect the axial crush deformation behavior from the front end to the rear region of the front side member 8. In addition, the side frames 20a and 20b of the sub-frame 20 are bent and deformed downward at the central portion between the fixed points at the front and rear ends thereof by the collision input as shown in FIG. By moving the fixed point on the front end side of the frame 20 back and forth substantially horizontally,
It is possible to suppress the occurrence of upward input to the front side member 8 due to the bending deformation, and to smoothly perform axial crush deformation from the front end of the front side member 8 to the rear region.

Further, by the downward bending deformation of the sub-frame 20, the drive motor 21 can be displaced downward and rearward to avoid interference with the dash panel 1, and the drive motor 21 can be displaced backward. When it interferes with the inclined portion 5F at the front end of the center member 5, the inclined portion 5F guides the drive motor 21 to fall along the inclination, so that the deformation of the vehicle interior C due to the backward movement of the drive motor 21 can be prevented. At the same time, the crush stroke of the front compartments F and C can be further expanded.

In particular, in this embodiment, the reinforcing member 24 inclined along the inclined portion 5F is disposed in the closed cross section of the inclined portion 5F, and the lower surface of the inclined portion 5F and the lower surface of the reinforcing member 24 are disposed. Since the space portion 25 is formed between the two, when the drive motor 21 retracts and interferes with the lower surface of the inclined portion 5F as described above, the lower surface is deformed in the space portion 25 to soften the impact. Energy can be absorbed by the space 25, and when the lower surface is bottomed in the space 25, the reinforcing member 24 can suppress the backward movement of the drive motor 21 and guide the drive motor 21 downwardly.

10 to 13 show a second embodiment of the present invention. In the present embodiment, a reinforcing member provided within the closed cross section of the inclined portion 5F at the front end of the center member in the first embodiment. The lower surface of 26 is formed in a concave curved surface shape so as to be able to receive the drive motor 21 when the drive motor 21 moves backward, so as to substantially match the circular shape of the outer shape of the drive motor 21.

Further, a frame member 27 having a hat-shaped cross section is joined and arranged in the front-rear direction along the toeboard 1b surface of the dash panel 1 above the front end portion (inclined portion 5F) of the center member 5 to form a closed cross section. Has been formed.

Therefore, according to the structure of the second embodiment, in addition to the same effect as that of the first embodiment, the driving motor 21 is moved backward when the frontal collision occurs as described above, and the inclined portion is moved. 5F interferes with the lower surface of 5F, and when the lower surface is bottomed, the concave surface of the lower surface of the reinforcing member 26 can appropriately receive the drive motor 21 and regulate the backward movement to perform a downward guide action. . Further, in this case, the reinforcing member 26
In, the area for receiving the drive motor 21 can be increased, and the input from the drive motor 21 to the center member 5 can be performed more reliably.

The toe board 1b of the dash panel 1
Since the closed cross section of the frame member 27 extends in the front-rear direction above the inclined portion 5F at the front end of the center member on the surface, the front of the bent portion where the dash panel 1 and the front floor 2 are continuously provided. The strength against the input is increased, the collision input from the front compartments F and C can be reliably supported, and the downward and rearward drop guide action by the inclined portion 5F when the drive motor 21 retracts can be performed more reliably. You can

14 and 15 show a third embodiment of the present invention. In the present embodiment, the front side portion of the engine 11 in the first embodiment is connected to the side sill 4 and the extension side member 9. It is attached via a mount member 13 on a connecting member 28 fixed in the vehicle width direction across the portion and the center member 5.

The front mount member 13 is constructed as a vibration-proof bushing type similar to the two rear mount members 13, but the phase of the mount member 13 on the rear side is changed by 90 degrees with respect to the mount member 13 on the rear side. It is attached to.

Therefore, according to the structure of the third embodiment, in addition to the same effect as that of the first embodiment, the side sill 4 and the center member 5 are connected by the connecting member 28 for mounting the front side portion of the engine 11. Since the load transmission between them is directly performed, the load distribution support performance of the vehicle interior protection cell structure Z can be further enhanced.

In each of the above embodiments, the engine 11 and the fuel tank 12 are used as the unit components, but not limited to these components, other rigid components can be used.

Further, the unit component 11 or 12 is connected between one side sill 4 and the center member 5,
A reinforcing member may be connected and arranged between the other side sill 4 and the center member 5 on the same axis line in the vehicle width direction to form a vehicle compartment protection cell structure Z having a substantially rectangular plane.

[Brief description of drawings]

FIG. 1 is an external perspective view of an automobile targeted by the present invention.

FIG. 2 is a schematic perspective view of the structure of the first embodiment of the present invention seen from below.

FIG. 3 is an enlarged perspective view showing a nut plate shown in a range A of FIG.

FIG. 4 is a schematic cross-sectional view taken along the line BB of FIG.

FIG. 5 is an explanatory plan view showing the structure of the first embodiment of the present invention as seen through.

FIG. 6 is a sectional view showing a mount member according to the first embodiment of the present invention.

FIG. 7 is an explanatory plan view showing the deformation behavior during a full-wrap frontal collision in the first embodiment of the present invention.

FIG. 8 is an explanatory plan view showing the deformation behavior during an offset frontal collision in the first embodiment of the present invention.

FIG. 9 is a side view illustrating the deformation behavior during a frontal collision according to the first embodiment of the present invention.

FIG. 10 is a side view similar to FIG. 9 showing a second embodiment of the present invention.

11 is a perspective view showing a reinforcing member in FIG.

12 is a perspective view showing a frame member in FIG.

13 is a schematic cross-sectional view taken along the line CC of FIG.

FIG. 14 is an explanatory plan view similar to FIG. 5, showing a third embodiment of the present invention.

FIG. 15 is a view on arrow D of FIG.

[Explanation of symbols]

C ... The passenger compartment FC: front compartment 1 ... Dash panel 2 ... Front floor (cabin floor) 4 ... Side sill 5 ... Center member 5F ... Inclined part 6 ... Second cross member (cross member) 7 ... Dash cross member 8 ... Front side member 9 ... Extension side member 10 ... First Cross Member 11 ... Engine (unit components) 12 ... Fuel tank (unit components) 12A ... Bracket 13 ... Mounting member 14 ... Body side bracket 14A ... Branch wall 15. Unit side bracket 15A ... Stay 16 ... Connection shaft 17 ... Anti-vibration bush 17a ... inner cylinder 17b ... Outer cylinder 17c ... Anti-vibration rubber 18 ... Nut plate 20 ... Subframe 21 ... Drive motor 22 ... Front suspension 24 ... Reinforcing member 25 ... Space 27 ... Frame member 28 ... Connecting member X ... Energy absorption cell structure Y: Input transmission cell structure Z: Vehicle compartment protection cell structure

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B62D 25/20 B62D 25/20 E

Claims (14)

[Claims] 1. A vehicle body structure in which unit components of a vehicle are mounted on a lower portion of a floor of a vehicle compartment, the pair of side sills extending in the vehicle front-rear direction on both sides of the floor in a vehicle width direction, and a floor. A center member extending in the vehicle front-rear direction on the lower surface of the central portion in the vehicle width direction, and a cross member extending in the vehicle width direction on the lower surface near the front end of the floor and connecting the center member and the side sill. And a unit component having rigidity, which is mounted between at least one of the side sills and the center member so as to be able to transmit force to each other, and has a substantially rectangular plane shape for suppressing deformation of the vehicle compartment at the time of collision. A vehicle body structure characterized by forming a room protection cell structure. 2. An energy absorption cell structure, which is located in front of the vehicle compartment and has a substantially rectangular planar shape, which absorbs energy by being deformed by a frontal collision, the energy absorption cell structure, and the vehicle interior protection cell structure. The input transmission cell structure having a substantially rectangular shape in plan view for transmitting the input from the energy absorption cell structure to the vehicle interior protection cell structure at the time of a frontal collision, between the vehicle and the vehicle. Car body structure. 3. The energy absorbing cell structure includes a pair of front side members extending in the vehicle front-rear direction on both sides of a front compartment in the vehicle width direction, and having a rear end portion coupled to a dash panel, and the pair of front side members. Front cross-members that connect the front ends of the front side members and extend in the vehicle width direction, and a pair of front side members that extend in the vehicle width direction at the bottom of the dash panel 3. A vehicle body structure for an automobile according to claim 2, characterized in that the vehicle body structure is composed of a dash cross member for connecting the. 4. The input transmission cell structure is arranged so as to extend from the rear end of each front side member to the lower surface side of the dash panel and extend toward the rear of the vehicle, and to connect each front side member to the cross member and the cross member. A pair of extension side members connected to the side sill, the dash cross member, the cross member, and a front end portion connecting the dash cross member and the cross member of the center member, The vehicle body structure of the automobile according to claim 3. 5. A nut plate for fastening and fixing is reinforced around the joint between the side sill and the extension side member and around the unit component mounting portion of the center member, and the unit component is mounted on these reinforced portions. The vehicle body structure according to claim 4, wherein the vehicle body structure is mounted via a bracket integrated with a member or a unit component. 6. A vehicle-body-side bracket, wherein the mount member includes a pair of front and rear parallel support walls that are substantially orthogonal to an axle, and is fixed to the vehicle body side; and a width substantially equal to a width between the pair of support walls. Of the inner cylinder, an outer cylinder having a width shorter than the width between the supporting walls, and a vibration-proofing bush made of a vibration-proof rubber connecting the inner and outer cylinders to each other. A unit side bracket fixed to the unit side with the vibration damping bush inserted between a pair of support walls of the vehicle body side bracket, the support cylinder and the inner cylinder of the vibration damping bush penetrate in the front-back direction, The vehicle body structure for an automobile according to claim 5, wherein the vehicle body structure is configured by a connecting shaft that connects the supporting wall and the inner cylinder. 7. The vehicle body side bracket is formed according to an outer shape around a joint between an extension side member and a side sill, and is externally fitted and fastened and fixed around the joint. The vehicle body structure of the automobile according to claim 6. 8. A connecting member is fixedly provided in the vehicle width direction across a connecting portion between the extension side member and the side sill and a center member, and the unit component is mounted on the connecting member or a unit component. The vehicle body structure according to claim 4, wherein the vehicle body structure is mounted via an integrated bracket. 9. Below the energy absorbing cell structure:
9. A vehicle body according to any one of claims 3 to 8, wherein a sub-frame is coupled and arranged across the first cross member and the cross member, and a drive motor and a front suspension are attached to the sub-frame. Construction. 10. The vehicle body structure for an automobile according to claim 9, wherein a front end portion connecting the dash cross member and the cross member of the center member is provided with a slanting portion which is slanted rearward and downward. 11. A reinforcing member, which is inclined along the inclined portion, is arranged in a cross section of the inclined portion, and a space is formed between a lower surface of the inclined portion and a lower surface of the reinforcing member. The vehicle body structure for an automobile according to claim 10. 12. The lower surface of the reinforcing member is formed so as to substantially conform to the outer shape of the drive motor so as to be able to receive the drive motor when the drive motor moves backward. 11. The vehicle body structure according to item 11. 13. A closed cross section is formed above the front end portion of the center member by joining and arranging frame members in the front-rear direction along the dash panel surface. The car body structure of the car. 14. The vehicle body structure according to claim 1, wherein the unit component is an engine or a fuel tank.