JP2003118640A - Front structure of vehicle body for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a retreat movement of a power unit in the case of frontal collision and improve an energy absorption effect by an axial collapse- deformation of a front side member. SOLUTION: As the power unit 8 is attached to a car body side member 9, which is independent, having all the connection points at upper area of the front side member 4, the power unit 8 is not effected by an axial collapse- deformation of the front side member 4 by a frontal collision and can avoid interference with a brake unit 2 by retreat movement of the power unit 8.

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.

[0002]

2. Description of the Related Art Some automobiles include, for example, Japanese Patent Laid-Open No. 10-3.
As disclosed in Japanese Patent No. 29701, a substantially girder-shaped mount member is connected across the tops of the left and right strut housings of the front compartment and the left and right front side members, and is arranged so as to project to the front of the dash panel. It is known that a power unit such as a control unit that controls the supply of electric power to a drive motor is suspended from the mount member at a position adjacent to the front side of the brake unit.

[0003]

The front side member is a main energy absorbing member that axially crushes and deforms in response to a frontal collision input of a vehicle to absorb energy.
If the front side member is axially crushed and deformed during a frontal collision, the power unit mounted on the front side member via the mount member may move backward and interfere with the brake unit.

In order to prevent the backward movement of the power unit at the time of a frontal collision, it is necessary to reinforce the front side member, and as a result, the axial crush deformation of the front side member is restricted and it is difficult to secure the energy absorption margin. Not only will it become a problem, but the addition of reinforcements will also be disadvantageous in terms of weight.

Therefore, the present invention provides a vehicle body front structure capable of avoiding the backward movement of the power unit in the case of a frontal collision of the vehicle and appropriately performing axial crush deformation of the front side member to absorb energy. To do.

[0006]

According to the invention of claim 1, in the front compartment, a power unit mounted adjacent to the front side of the brake unit projectingly arranged on the front surface of the dash panel is installed in the front compartment. It is characterized in that it is attached to a vehicle body-side member different from the front side member, which has all the connecting points above a pair of left and right front side members arranged in the lower side in the front-rear direction.

According to a second aspect of the present invention, in the vehicle body front structure according to the first aspect, the vehicle body-side member is a pair of left and right extending in the front-rear direction in the upper portion of the front compartment. Hood ridge member and the left and right 1
A rear side member connected across the tops of a pair of left and right strut housings respectively connected to the pair of front side members, and left and right side parts of the rear side member and a front end of the front compartment extending in the vehicle width direction. It is characterized in that it is provided with a pair of left and right front side members connected to the existing vehicle body front frame, and the power unit is suspended over the rear side member and the front side member.

According to a third aspect of the invention, in the vehicle body front structure according to the second aspect, the front member is formed in a side-faced inverted V shape having a top near the front end position of the power unit. It is characterized by that.

According to a fourth aspect of the present invention, in the vehicle body front structure according to the first aspect, the vehicle body side member is a pair of left and right extending in the front-rear direction in the upper portion of the front compartment. Hood ridge member and the left and right 1
A rear side member connected across the tops of a pair of left and right strut housings connected respectively to a pair of front side members, and a front side connected across the left and right hood ridge members in front of the rear member. A member, and the power unit is hung over the rear side member and the front side member.

According to a fifth aspect of the present invention, in the vehicle body front structure according to the fourth aspect, the front side member has a vehicle width direction central portion for supporting the front side portion of the power unit, the front side member. It is formed by bending downward from the bent portions set on both left and right sides, and connecting members are connected in the front-rear direction across the bent portions and the rear member.

According to a sixth aspect of the present invention, in the vehicle body front structure according to the fifth aspect, the connecting point between the bent portion of the front member and the connecting member is the rear side of the connecting member rear end. It is characterized in that both side portions of the connecting member and the front side member are inclined so that the ground clearance is higher than the connecting point with the member and the connecting point with the hood ridge member at the end of the front side member.

[0012]

According to the invention described in claim 1, since the power unit is mounted on a vehicle body side member different from the front side member having all the connecting points above the front side member, a front collision may occur. Even if the front side member is axially crushed and deformed (axial crushing deformation), the power unit is not affected, and interference with the brake unit due to the retreat of the power unit can be avoided. As a result, the brake unit and the power unit can be avoided. It is possible to reduce the front-to-rear clearance between and and facilitate component layout.

Further, since it is not necessary to reinforce the front side member in order to suppress the backward movement of the power unit in the case of a frontal collision as in the conventional case, the axial crushing deformation stroke of the front side member is not restricted to be short and the energy absorption amount is reduced. A large amount can be secured, and a reinforcing material can be omitted, which is advantageous in weight and cost.

According to the second and fourth aspects of the invention, in addition to the effect of the first aspect of the invention, the vehicle-body-side member includes the rear-side member that extends between the tops of the left and right strut housings. The rear member can enhance the backward movement restriction effect of the power unit at the time of a frontal collision.

According to the invention of claim 3, claim 2
In addition to the effect of the present invention, an input acting on the front side member from the vehicle body front frame in the axial direction at the time of a frontal collision causes the front side member to reverse V in the vicinity of the front end position of the power unit.
Since it is bent and deformed so that it lifts upward from the top of the letter-shape, the power unit can be given a rotational movement that rises forward so that the rear surface of the power unit can be moved away from the brake unit, making it easier to brake. The effect of avoiding interference with the unit can be enhanced.

According to the invention of claim 5, claim 4
In addition to the effect of the invention described above, since the connecting members are coupled in the front-rear direction across the bent portions on both left and right sides of the front member and the rear member, the supporting rigidity of the power unit can be increased.

According to the invention of claim 6, claim 5
In addition to the effects of the invention described above, due to the load acting on the strut housing and the hood ridge member in the inclining direction at the time of a frontal collision, the side portion of the front side member and the connecting member are connected to the bent portion and the connecting member of the front side member. Since the connecting point of is bent and deformed so as to lift upward, it is possible to give the power unit a rotational behavior that rises to the front and move the power unit so that its rear surface separates from the brake unit and becomes independent of the brake unit. The interference avoidance effect can be enhanced.

[0018]

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 vehicle body front structure of an electric vehicle as an example.

In FIGS. 1 and 2, reference numeral 1 denotes a dash panel which separates the front compartments F and C from the cabin C. A brake unit 2 is disposed on one side of the dash panel 1 so as to project forward. There is.

The front compartments F and C are provided with a hood ridge member 3 on the upper side of the left and right side portions thereof and a side member 4 on the lower side thereof as a front-back skeleton member having a closed cross-section structure.

The hood ridge member 3 has its rear end connected to a front pillar (not shown), and the front ends of the left and right hood ridge members 3, 3 are formed by an upper member 5A of a radiator core support member 5 which is a vehicle body front frame. It is connected.

The front side member 4 is a main energy absorbing member at the time of a frontal collision, and its rear end portion is wound around the lower surface side of the dash panel 1 to be joined to the left and right front side members 4, 4. The front end of the hood ridge member 3 is connected to the front end of the hood ridge member 3 by a radiator core support member 5 and the projecting end in front of the radiator core support member 5 is connected by a first cross member 6. .

The hood ridge member 3 and the front side member 4 are connected by a strut housing 7 at an intermediate portion of their length.

Inside the front compartments F and C, a control unit 8 is installed adjacent to the front side of the brake unit 2 for controlling the supply of power to a power unit, for example, a drive motor (not shown).

The control unit 8 has a notch portion 8a formed at the rear portion on one side corresponding to the brake unit 2 for avoiding interference with the brake unit 2, and the left and right front side members 4, 4 are formed. A vehicle body side member different from the front side member 4 above the space,
For example, it is attached to a mount member 9 made of a metal pipe material.

The mount member 9 has its both ends fastened and fixed to the tops of the left and right strut housings 7, 7 with bolts and nuts 13 via brackets 12, and a rear side member 11 extending in the vehicle width direction, and the rear side. A pair of left and right front members 14 are integrally joined to a position near the bracket 12 of the member 11 and extend forward, and the front end is fastened and fixed to the upper member 5A of the radiator core support member 5 with bolts and nuts 13. I have it.

The rear side member 11 is integrally provided with a rear side erection member 15 which is joined at a portion inside the front side member 14 in the vehicle width direction and extends rearward and extends downward. There is.

On the other hand, the left and right front side members 14, 14
Front side erection member 16 extending downward across the ridge
Are joined and arranged.

A plurality of mounting seat portions 17 are provided on the lower part of the front and rear surfaces of the control unit 8 so that the control unit 8 can mount these mounting seat portions 17 on the rear side mounting member 15 and the front side mounting member. The control unit 8 is hung on the rear side member 11 and the front side member 14 by being engaged with each of the horizontal portions 15a and 16a of the sixteen and joined or fixed by bolts and nuts.

Further, the front side members 14, 14
Is formed in a side-reverse V-shape having a top at the joint portion of the front side erection member 15 near the front end position of the control unit 8.

In FIG. 2, 18 is a hood and 19 is a front windshield.

According to the structure of the first embodiment having the above structure, the control unit 8 is mounted on the mount member 9 different from the front side member 4 having all the connecting points above the front side member 4. Therefore, even if the front side member 4 is axially crushed and deformed due to a frontal collision, the backward movement of the control unit 8 is not affected, and interference with the brake unit 2 due to the backward movement of the control unit 8 can be avoided. .

As a result, the front-rear clearance between the brake unit 2 and the control unit 8 can be reduced, and the component layout can be facilitated.

Further, since it is not necessary to reinforce the front side member 4 in order to suppress the backward movement of the control unit in the case of a frontal collision as in the prior art, the axial crushing deformation stroke of the front side member 4 is not restricted to be short. A large amount of energy absorption can be secured, and a reinforcing material can be omitted, which is advantageous in weight and cost.

Here, particularly in the present embodiment, as described above, the mount member 9 is provided with the rear side member 11 which extends between the tops of the left and right strut housings 7, 7, so that the rear side member 11 is used. The backward movement restriction effect of the control unit 8 at the time of a frontal collision can be enhanced.

Further, the left and right front side members 14 connected in the front-rear direction across the rear side member 11 and the upper member 5A of the radiator core support member 5 have a side surface inverted V having a top near the front end position of the control unit 8. Since it is formed in a V-shape, an input acting in the axial direction from the upper member 5A to the front-side member 14 at the time of a frontal collision causes the front-side member 14 to be lifted upward starting from the side V-shaped top. Bend and deform.

Therefore, the control unit 8 can be moved so that its rear surface separates from the brake unit 2 by giving the control unit 8 a rotational movement upward and forward, and avoiding interference with the brake unit 2. The effect can be enhanced.

3 and 4 show a second embodiment of the present invention. In this embodiment, the mount member 9A has bolts and nuts 13 at both ends on the tops of the left and right strut housings 7, 7 via brackets 12A. And a rear side member 11A which is fastened and fixed by means of a bolt and a nut 13 to the left and right hood ridge members 3, 3 in front of the rear side member 11A. And a front side member 14A extending in the direction.

The rear side member 11A is integrally provided with a rear side member 15A which is joined to both left and right sides of the rear side member 11A and projects rearward and extends downward.

On the other hand, the front side member 14A has a front side erected portion 16A formed by bending the center portion in the vehicle width direction downward in a crank shape from the bent portions P set on both left and right sides of the front side member 14A. .

In the control unit 8, the mounting seats 17 at the lower front and rear surfaces of the control unit 8 are engaged with the horizontal portions 15a, 16a of the rear-side erected member 15A and the front-side erected portion 16A, and are joined or fixed by bolts, nuts or the like. Then, the control unit 8 is suspended over the rear side member 11A and the front side member 14A.

A connecting member 21 is joined and fixed in the front-rear direction across the left and right bent portions P of the front member 14A and the rear member 11A.

The connecting point between the bent portion P of the front member 14A and the connecting member 21 is the connecting point with the rear member 11A at the rear end of the connecting member 21 and the hood ridge member at the rear end of the front member 14A. Both side portions of the connecting member 21 and the front side member 14A are formed so as to be inclined so that the ground clearance is higher than the connecting point with the connection point 3 with the connecting member 21.

Therefore, according to the structure of the second embodiment, in the same manner as the first embodiment, the front side member 4 is effectively axially crushed and deformed against the frontal collision, thereby enhancing the energy absorption effect. In addition, it is possible to avoid the interference between the control unit 8 and the brake unit 2 without the backward movement of the control unit 8 in the axial crush deformation, and moreover, the rear side member 11A of the mount member 9A controls the control unit. The backward movement restriction effect of 8 can be enhanced.

Although the rear side member 11A and the front side member 14A are both arranged in the vehicle width direction, they are connected to each other in the front-rear direction by a connecting member 21 at the side portions adjacent to the left and right strut housings 7, 7. Therefore, the support rigidity of the control unit 8 can be further increased.

Further, the bent portion P of the front member 14A
The connecting point between the connecting member 21 and the connecting member 21 is higher than the connecting point between the rear end of the connecting member 21 and the rear member 11A and the connecting point between the hood ridge member 3 at the side end of the front member 11A. Since both side portions of the connecting member 21 and the front side member 14A are formed to be inclined, the load acting on the strut housing 7 and the hood ridge member 3 in the inclining direction at the time of a frontal collision causes
The side members of the front side member 14A and the connecting member 21
And are bent and deformed so that the connecting point between the bent portion P of the front side member 14A and the connecting member 21 is lifted upward.

As a result, the control unit 8 can be moved so that its rear surface separates from the brake unit 2 by giving the control unit 8 an upward rotational behavior and avoiding interference with the brake unit 2. The effect can be enhanced.

In each of the above embodiments, the control unit is exemplified as the power unit supported by the mount member 9. However, the present invention is not limited to this, and a drive motor may be mounted. Can be equipped with an engine.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is an explanatory sectional view of the first embodiment of the present invention.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is an explanatory cross-sectional view of the second embodiment of the present invention.

[Explanation of symbols]

1 Dash panel FC front compartment 2 Brake unit 3 Food Ridge members 4 Front side members 5A front frame 7 strut housing 8 power units 9 Body side member 11,11A Rear member 14,14A Front side member 21 connected members P bending part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B62D 21/00 B62D 21/00 B 21/02 21/02 A

Claims (6)

[Claims] 1. A pair of left and right in which a power unit mounted adjacent to the front side of a brake unit projectingly arranged on the front surface of a dash panel in a front compartment is arranged at the lower side of the front compartment so as to extend in the front-rear direction. The vehicle body front structure, characterized in that the vehicle body front member is attached to a vehicle body-side member different from the front side member, which has all the connecting points above the front side member. 2. The vehicle body-side member comprises a pair of left and right hood ridge members extending in the front-rear direction on the upper side of the front compartment, and a pair of left and right front side members connected to each other. A pair of left and right members joined across the top of the strut housing and a pair of left and right parts of the rear member and a vehicle body front frame extending in the vehicle width direction at the front end of the front compartment. 2. The vehicle body front structure according to claim 1, further comprising: a front side member, wherein the power unit is suspended between the rear side member and the front side member. 3. The vehicle body front structure according to claim 2, wherein the front member is formed in a side-faced inverted V shape having a top near the front end position of the power unit. 4. The body-side member comprises a pair of left and right hood ridge members extending in the front-rear direction on the upper side of the front compartment, and a pair of left and right members connected to the pair of left and right front side members. The strut housing is provided with a rear side member that is coupled across the tops and a front side member that is coupled to the left and right hood ridge members in front of the rear side member. The vehicle body front structure according to claim 1, wherein the vehicle body front structure is hung from the vehicle. 5. The front side member is formed by bending a vehicle width direction central portion supporting a front side portion of the power unit downward from bent portions set on both left and right side portions of the front side member. The vehicle body front structure according to claim 4, wherein a connecting member is coupled in the front-rear direction across the portion and the rear member. 6. The ground connecting point of the bent portion of the front member and the connecting member is higher than the connecting point of the rear end of the connecting member with the rear member and the connecting point of the front member side end with the hood ridge member. The vehicle body front structure according to claim 5, wherein the connecting member and the front-side member both side portions are formed so as to be inclined so that the height becomes higher.