JPH08282537A - Dash cross section structure for vehicle - Google Patents

Abstract

PURPOSE: To secure a space for a crushing stroke at the side of a front side member, and thereby restrain deformation at the side of a dash panel by disposing a dash cross member at both sides of the dash panel for an engine room and the inside of a cabin, and thereby forming a dash cross section. CONSTITUTION: Dash cross members 17 and 18 are disposed at both sides of a dash panel for an engine room E and the inside of a cabin K, and a dash cross section is thereby formed. Namely, the clash cross member 17 and the dash cross member 18 are combined with the the engine room E and the inside of the cabin K respectively in such a way as to be formed into a closed cross section while being interspaced from a front side member 11. By this constitution, the section modulus of the closed cross section can thereby be secured, and since load from the side member 11 at the time of collision with a vehicle can be dispersed into the wide area of the dash panel 15 through the clash cross member, so that the deformation of the dash panel 15 can thereby be restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body dash cross section structure.

[0002]

2. Description of the Related Art As a conventional device of this kind, there is one shown in FIGS. 8 and 9, for example (Japanese Patent Laid-Open No. 4-126).
(See Japanese Patent No. 678).

That is, a pair of front side members 1 (one of which is omitted) which are parallel to each other along the vehicle front-rear direction are arranged on both sides of the front portion of the vehicle body. A cowl side member 2 bent in an S shape is joined, and the cowl side member 2 connects the front side member 1 and a front pillar (not shown).

An extension portion 1a curved inward of the vehicle is formed on the vehicle rear end side of the front side member 1, and a cross is provided between the extension portions 1a of the pair of front side members 1. The member 3 is installed. The cross member 3 has a hat-shaped cross section, and both flange portions 3 a are welded to a surface portion of the dash panel 4 on the engine room side.

As a result, at the time of a vehicle frontal collision, a collision load is input to the front side member 1, the member 1 is crushed and the collision energy is absorbed, and at the same time, the front side member 1 and the cross member 3 interpose a dash panel. By inputting the load to 4, the load is widely dispersed.

[0006]

However, in such a conventional one, since the cross member 3 is largely projected toward the engine room, the front side member 1 is crushed at the time of a vehicle collision, and the illustration is omitted. When the engine retracts, the engine interferes with the cross member 3 at an early stage, so that the collapse stroke of the front side member 1 is actually short, and the energy absorbing member such as the front side member 1 is not completely collapsed. The amount of energy absorbed on the engine room side is reduced, and the amount of energy must be absorbed on the passenger compartment side by that amount.
In some cases, the deformation amount of the dash panel 4 such as the amount of retreat of the dash panel 4 becomes excessive and the occupant living space becomes small.

Therefore, the present invention is to provide a dash cross structure for a vehicle which can secure a crushing stroke on the front side member side and can suppress the amount of deformation on the dash panel side.

[0008]

The present invention has been made in view of the above problems, and the invention described in claim 1 is such that the rear end portions of a pair of front side members are joined to a dash panel and both rear end portions are joined together. In the vehicle dash cross portion structure, in which a dash cross portion having a closed cross-section portion is provided between the portions, in the vehicle width direction, the dash cross portion is provided on the engine room side of the dash panel. The engine room-side dash cross member is joined so as to form a closed cross-section portion and is disposed so as to straddle between the rear end portions of the front side members, and the vehicle interior of the dash panel The inner dash cross member is joined so as to form a closed cross section, and is formed so as to straddle between the rear ends of the front side members. It is characterized by a door.

According to a second aspect of the present invention, the rear end portions of the pair of front side members are joined to the dash panel, and the rear end portions extend in the vehicle width direction along the dash panel and are closed. In a vehicle dash cross portion structure provided with a dash cross portion having a cross-sectional portion, in the dash cross portion, a portion of the dash panel is bulged toward a vehicle interior side or a vehicle exterior side to cross along a vehicle width direction. A member section is formed, and a dash cross member is joined to the side opposite to the bulging side of the dash panel across the rear ends of the front side members to form a closed cross section. Is characterized by.

According to a third aspect of the invention, the rear end portions of the pair of front side members are joined to the dash panel, and the rear end portions extend in the vehicle width direction along the dash panel and are closed. In a vehicle dash cross section structure provided with a dash cross section having a cross section, the dash cross section includes a dash cross member having a substantially hat-shaped cross section that is open to the rear of the vehicle on the engine room side of the dash panel. The closed cross-section portion is formed by being joined and disposed between the rear end portions of the front side members, and the dash cross member has a hat-shaped cross-section so as to be easily crushed against a load from the front of the vehicle. It is characterized in that a bent portion is formed on the horizontal surface portion.

According to a fourth aspect of the present invention, the rear end portions of the pair of front side members are joined to the dash panel, and the rear end portions extend in the vehicle width direction along the dash panel and are closed. In a vehicle dash cross portion structure provided with a dash cross portion having a cross-section portion, in the dash cross portion, a part of the dash panel is bulged toward the engine room side and a cross member portion is formed along the vehicle width direction. A dash cross member having a substantially hat-shaped cross section is joined to the inside of the dash panel inside the vehicle so as to straddle between the rear ends of the front side members to form a closed cross section. The part is characterized in that it is formed so as to bulge obliquely with respect to the horizontal direction so as to be easily broken against a load from the front of the vehicle.

[0012]

According to the invention described in claim 1, since the dash cross member is formed by disposing the dash cross member on the engine room side and the vehicle interior side of the dash panel, the closed cross section portion The section modulus can be secured, and the load at the time of a vehicle collision can be dispersed from the front side member to a wide area of the dash panel via the dash cross portion, so that the deformation amount of the dash panel can be suppressed.

Further, since the dash cross member is also arranged on the vehicle interior side of the dash panel to secure the section modulus, the cross sectional area of the dash cross member arranged on the engine room side is smaller than that of the conventional one. As a result of being small,
Even if the engine in the engine room retracts at the time of a vehicle collision, the engine collides with the dash cross member at a later time than before, so the collapsing stroke of the front side member can be lengthened accordingly, causing a collision on the front side member side. The amount of energy absorbed can be increased, and the amount of deformation of the dash panel can be suppressed.

According to the second aspect of the present invention, a part of the dash panel is bulged toward the inside or the outside of the vehicle to form the cross member along the vehicle width direction, and the cross section has a substantially hat shape. Since the closed cross-section is formed by straddling and joining the dash cross members between the front end portions of both front side members, a cross-sectional modulus is ensured as compared with the invention according to claim 1. Since one of the dash cross members can be eliminated, the number of parts can be reduced.

According to the invention described in claim 3, the dash cross member is arranged on the engine room side of the dash panel, but the dash cross member is easily crushed by a load from the front of the vehicle. As described above, since the bent portion is formed in the horizontal plane portion of the hat-shaped cross section, even if the engine retreats and collides with the dash cross member early, the dash cross member is easily crushed. The load does not directly act on the dash panel, and the front side member side is crushed, and the crush stroke can be secured as compared with the conventional case.

According to the invention described in claim 4, by forming the cross member portion in the dash panel, as in the invention described in claim 2, the section modulus is secured and the number of parts is reduced. It is possible to reduce.

Further, since the cross member portion is formed so as to bulge obliquely with respect to the horizontal direction so as to be easily broken by the load from the front of the vehicle, the engine is retracted and the cross member portion is quickly formed. Even if a collision occurs, since the cross member portion is easily broken, the load from the engine does not directly act on the dash panel, and the front side member side is crushed and a crush stroke can be secured as compared with the conventional case.

[0018]

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

1 to 3 show a first embodiment of the present invention.

First, the structure will be described. In FIG. 1, reference numeral 11 is a front side member, and a pair (one is omitted) is arranged on both sides in the vehicle width direction along the vehicle front-rear direction. The outside has an open U-shaped cross section, and the open portion is closed by the closing plate 12 to form a closed cross section structure.

The rear end 1 of this closing plate 12
2a is curved toward the outside of the vehicle, and the side sill 1 is inserted through the extension front member 13 as shown in FIG.
4 is connected.

The flange portion 11b formed on the rear end portion 11a of the front side member 11 is joined to the dash panel 15, and the front end portion 16a of the extension center member 16 is joined to the rear end portion 11a. It extends toward the rear of the vehicle. The extension center member 16 is joined to the lower surface of the dash panel 15.

Then, both front side members 11
An engine room side dash cross member 17 and a vehicle room side dash cross member 18 are arranged between the rear ends 11a. The engine room side dash cross member 17 has a substantially hat-shaped cross section, and flange portions 17a are formed at both ends thereof. The flange portions 17a are joined to the front side member 11 and upper and lower flanges of the hat-shaped cross section. The portion 17b is joined to the surface portion of the dash panel 15 on the engine room E side.

Further, the dash cross member 18 on the passenger compartment side
Has a substantially hat-shaped cross section, both end portions 18a thereof are extended to a position positioned directly behind the front side member 11, and a flange portion 18b is joined to the vehicle compartment K side of the dash panel 15 of the dash panel 15.

Both dash cross members 17, 18
Is the engine room E side of the dash panel 15 and the vehicle room K
The closed cross-section portions 19 and 20 are formed in a position corresponding to the side and with the dash panel 15 interposed. By these both dash cross members 17, 18, etc.,
A dash cross section, which is one component of the present invention, is configured.

The closed cross-sections 19 and 20 are continuous with the closed cross-section of the front side member 11.

Reference numeral 22 in FIG. 1 denotes a suspension member.

Next, the operation will be described.

At the time of a vehicle front collision, a collision load is input to the front side member 11, the member 11 is crushed and the collision energy is absorbed, and the front side member 11 dashes through both dash cross members 17 and 18. The load is input to the panel 15.

In this case, the dash cross member 17, on the engine room E side and the vehicle room K side of the dash panel 15,
By arranging 18, the projection amount of the engine room side dash cross member 17 to the engine room E side can be made small while securing the section modulus around the Z axis. Therefore, even if the engine (not shown) is retracted, the dash cross member 1 on the engine room side can be immediately used as in the conventional case.
Since it does not collide with 7, the front side member 1
As a result, the deformation stroke of the dash panel 15 can be suppressed as compared with the conventional case, and the occupant living space at the time of a collision can be sufficiently ensured, and the impact energy absorption characteristics are improved. be able to.

On the other hand, although the vehicle interior side dash cross member 18 is disposed on the vehicle interior K side, as compared with the case where the dash cross is disposed only on the vehicle interior K side to secure the section modulus, the engine Since the room-side dash cross member 17 is provided and the cross-sectional modulus is secured by both, it is not necessary to increase the protrusion amount toward the vehicle interior K side, and therefore it is provided inside the vehicle interior K. Interference with a pedal or the like not shown does not pose a problem.

FIG. 4 shows a second embodiment of the present invention.

In this embodiment, a cross member portion 25a protruding toward the engine room E is provided on a part of the dash panel 25.
Is formed so as to straddle both front side members 11 along the vehicle width direction. Also, this dash panel 25
Inside the passenger compartment K, a passenger compartment-side dash cross member 18 similar to that of the first embodiment is arranged. The vehicle interior side dash cross member 18 and the cross member portion 25a form a closed cross section 26, which is continuous with the front side member 11. The vehicle interior side dash cross member 18 and the cross member portion 25a constitute a dash cross portion which is a component of the present invention.

In this way, compared with the first embodiment, the number of parts is reduced because the engine room side dash cross member 17 is unnecessary without reducing the section modulus around the Z axis of the closed section 26. Can be achieved. That is, in the first embodiment, the engine room side dash cross member 17 and the vehicle compartment side dash cross member 18 are arranged on both sides of the dash panel 15 to secure the section modulus. The dash panel 15 located between the parts 19 and 20 does not contribute much to the increase in the section modulus. Therefore, in the second embodiment, the dash cross member 17 on the engine room side is eliminated, and the dash member portion 25a is formed instead of the dash cross member 17 to secure the section modulus and reduce the number of parts. .

Of course, contrary to the above, the dash panel 2
It is also possible to bulge the cross member portion 25a of No. 5 inside the vehicle compartment K, eliminate the vehicle interior side dash cross member 18, and dispose the engine room side dash cross member 17. Even in this case, the same advantages as described above can be obtained.

FIG. 5 shows a third embodiment of the present invention.

In this embodiment, the dash panel 29 has a cross member portion 29a which bulges inwardly of the vehicle compartment K extending between the front side members 11, while the engine room E side has an engine room side. The dash cross member 30 is disposed so as to be joined between both front side members 11, and a closed cross-section portion 31 is formed by the cross member portion 29a and the engine room side dash cross member 30.

The engine room side dash cross member 30 has a bellows portion as a bent portion formed on the pair of horizontal plane portions 30a, and is easily crushed by the load from the front of the vehicle.

According to this, when the engine retreats and interferes with the engine side dash cross member 30 at the time of a frontal collision of the vehicle, the dash cross member 30 has a bellows-like shape and easily collapses. The crushing stroke of the side member 11 can be secured.

On the other hand, the section modulus around the Z-axis of the closed cross section 31 is greatly influenced by the distance and cross-sectional area of the closed cross section 31 in the front-rear direction. It can be made large and the section modulus can be secured. Therefore, the load from the front side member 11 can be dispersed over a wide range of the dash panel 29 via the closed cross section 31.
The amount of deformation of the inside of the passenger compartment K can be reduced.

FIG. 6 shows a fourth embodiment of the present invention.

In this embodiment, the dash panel 34 has a planar shape, and the engine room side dash cross member 35 is disposed inside the vehicle compartment K of the dash panel 34. This engine room side dash cross member 3
5 has a substantially hat-shaped cross section, and has a flange portion 35a.
Is joined to the dash panel 34 to form a closed cross-section portion 36, and the horizontal plane portion 35b of the dash cross member 35 has a stepped portion as a bent portion.
It is set to become thinner toward the front of the vehicle.

In such a structure, the engine room side dash cross member 35 is provided on the engine room E side.
Is arranged, and the protrusion amount is set to be substantially the same as the conventional one so as to secure the section modulus of the closed section 36. Therefore,
When the engine retreats due to a vehicle collision, the engine interferes with the engine room side dash cross member 35 at the same position as in the conventional case. However, since the dash cross member 35 is formed in a stepped shape and is more easily crushed than in the conventional case, the front side member is crushed. It is possible to secure 11 crush strokes.

FIG. 7 shows a fifth embodiment of the present invention.

In this embodiment, a cross member portion 39a which bulges toward the engine room E side is formed on the dash panel 39, and a vehicle interior side dash cross member 40 is joined to the vehicle room K side to form a closed cross section 41. Has been done.

The cross member portion 39a is formed along the pressing direction P of the dash panel 39 and faces diagonally downward.

According to this structure, the section modulus around the Z-axis of the closed section 41 is secured, and when the engine retreats and collides with the cross member 39a, the cross member 39a tilts. Because it is easy to break,
The crush stroke of the front side member 11 can be secured.

[0048]

As described above, according to the invention described in claim 1, the dash cross members are formed on the engine room side and the vehicle interior side of the dash panel to form the dash cross portion. Therefore, the section modulus of the closed section can be secured, and the load at the time of vehicle collision can be dispersed from the front side member to the large area of the dash panel via this dash cross section, so the deformation amount of the dash panel can be suppressed. You can

Further, since the dash cross member is also arranged on the interior side of the dash panel to secure the section modulus, the cross sectional area of the dash cross member arranged on the engine room side is smaller than that of the conventional one. As a result of being small,
Even if the engine in the engine room retracts at the time of a vehicle collision, the engine collides with the dash cross member at a later time than before, so the collapsing stroke of the front side member can be lengthened accordingly, causing a collision on the front side member side. The amount of energy absorbed can be increased and the amount of deformation of the dash panel can be suppressed.

According to the second aspect of the present invention, a part of the dash panel is bulged toward the vehicle interior side or the vehicle exterior side to form the cross member portion along the vehicle width direction, and the cross section has a substantially hat shape. Since the closed cross-section is formed by straddling and joining the dash cross members between the front end portions of both front side members, a cross-sectional modulus is ensured as compared with the invention according to claim 1. Since one of the dash cross members can be eliminated, the number of parts can be reduced.

According to the third aspect of the present invention, the dash cross member is arranged on the engine room side of the dash panel, but the dash cross member is easily crushed by the load from the front of the vehicle. As described above, since the bent portion is formed in the horizontal plane portion of the hat-shaped cross section, even if the engine retreats and collides with the dash cross member early, the dash cross member is easily crushed. The load does not directly act on the dash panel, and the front side member side is crushed, and the crush stroke can be secured as compared with the conventional case.

According to the invention described in claim 4, by forming the cross member portion in the dash panel, as in the invention described in claim 2, the section modulus is secured and the number of parts is reduced. It is possible to reduce.

Further, since the cross member portion is formed so as to be bulged obliquely with respect to the horizontal direction so as to be easily broken by the load from the front of the vehicle, the engine retreats and the cross member portion is formed at an early stage. Even if a collision occurs, the cross member portion is easily broken, so that the load from the engine does not directly act on the dash panel, and the front side member side is crushed, so that a crush stroke can be secured as compared with the conventional case. Exert a beneficial effect.

[Brief description of drawings]

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

FIG. 2 is a schematic plan view showing the first embodiment.

FIG. 3 is an exploded perspective view showing the first embodiment.

FIG. 4 is a sectional view taken along the vehicle front-rear direction showing a second embodiment of the present invention.

FIG. 5 is a sectional view corresponding to FIG. 4, showing a third embodiment of the present invention.

FIG. 6 is a sectional view corresponding to FIG. 4, showing a fourth embodiment of the present invention.

FIG. 7 is a sectional view corresponding to FIG. 4 showing a fifth embodiment of the present invention.

FIG. 8 is a perspective view showing a conventional example.

FIG. 9 is a plan view showing the conventional example.

[Explanation of symbols]

 11 Front side members 15,25,29,34,39 Dash panel 25a, 29a, 39a Cross member 17,30,35 Engine room side dash cross 18,40 Car room side dash cross 19,20,26,31,36 , 41 Closed section E Engine room K compartment

Claims (4)

[Claims] 1. A pair of front side members have rear end portions joined to a dash panel, and a dash cross portion having a closed cross-section portion extending in the vehicle width direction along the dash panel between the rear end portions. In the provided dash cross section structure for a vehicle, the dash cross section is joined to the engine room side of the dash panel so that the engine room side dash cross member forms a closed cross section, While straddling between the rear ends,
The dash cross member is formed on the inside of the dash panel on the inside of the vehicle by being joined so as to form a closed cross-section and straddling between the rear ends of the front side members. The structure of the dash cloth part for the vehicle, which is characterized by being 2. A pair of front side members have rear end portions joined to a dash panel, and a dash cross portion extending in the vehicle width direction along the dash panel and having a closed cross section between the rear end portions. In the provided vehicle dash cross section structure, the dash cross section is such that a part of the dash panel is bulged toward the vehicle interior side or the vehicle exterior side to form a cross member section along the vehicle width direction, A dash cross member for vehicles, wherein a dash cross member is joined to a side opposite to the bulging side of the dash panel so as to straddle between rear end portions of the front side members to form a closed cross section. Part structure. 3. A pair of front side members have rear end portions joined to a dash panel, and a dash cross portion extending along the dash panel in the vehicle width direction and having a closed cross section between the rear end portions. In the provided dash cross section structure for a vehicle, the dash cross section includes a dash cross member having a substantially hat-shaped cross section, which is open to the rear of the vehicle, on the engine room side of the dash panel at the rear end portions of the front side members. The dash cross member is formed so as to have a closed cross section formed by being joined to and spanned between the dash cross members, and a bent portion is formed on a horizontal plane of the hat-shaped cross section so that the dash cross member can be easily crushed against a load from the front of the vehicle. The dash cross structure for a vehicle, which is characterized by being. 4. A pair of front side members have rear ends joined to a dash panel, and a dash cross portion extending in the vehicle width direction along the dash panel and having a closed cross section between the rear end portions. In the provided dash cross section structure for a vehicle, in the dash cross section, a part of the dash panel is bulged toward the engine room to form a cross member section along the vehicle width direction, and the dash panel is formed. On the inside of the vehicle, a dash cross member having a substantially hat-shaped cross section is joined across the rear end portions of the front side members to form a closed cross section. A dash-cross structure for a vehicle, which is formed so as to bulge obliquely with respect to the horizontal direction so as to be easily broken.