JP3519788B2 - Rear collision side structure for automobile rear floor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side collision preventing structure for a rear floor of an automobile.

[0002]

2. Description of the Related Art The floor of an automobile generally comprises a front floor and a rear floor connected to the rear of the front floor. As shown in FIG. 3, the floor is connected to the rear end of the front floor 10 and the front end of the rear floor 1. Is provided with a rising surface portion 2, and the rising surface portion 2 causes the rear floor 1 to become the front floor 1.
Normally, the rear seat is set on a position higher than 0, and a rear seat is installed on the rear floor 1. On the rear surface of the rising surface 2, a cross member 2a or the like is used to close a cross-section. 3 are formed to secure the strength and rigidity of the rising surface portion 2 (for example, the actual open flat plate 5-78677).
(See Japanese Patent Publication). Left and right side end portions of the constituent members of the closed cross section 3 including the front floor 10, the rear floor 1, and the rising surface portion 2 are fixed to the inner surface portions of the left and right side sills 4.

[0003]

In the conventional general rear floor structure as described above, when a side collision occurs,
Moving Deformable Barrier
3D), the rear door 7 is deformed inward so that the rear door 7 and the MDB can ride up to the upper part of the rear floor 1 together as shown in FIG. 3D. Therefore, there is a problem that the rear floor 1 and the closed cross-section portion 3 formed on the front end portion thereof cannot properly receive the load of the side collision and cannot effectively absorb the collision energy.

As a countermeasure against a side collision of the rear floor,
As shown in FIG. 4, the guard pipe 11 is attached to the upper part of the rear floor 1 in the vehicle width direction by the attaching member 12 in the fitting process so that the side end surface of the guard pipe 11 faces the inner surface of the rear door 7. Although such a structure has been conventionally considered, the structure of mounting the guard pipe 11 in the fitting process is not only troublesome in mounting work but also has a large weight increase, and the rear door 7 and the guard pipe which have been deformed inward at the time of a side collision. There is a problem that the guard pipe 11 is bent depending on how the side end surface of 11 hits, and the collision load cannot be stably received.

An object of the present invention is to solve the above conventional problems.

According to the present invention, an upper closed cross-section portion in the vehicle width direction is provided above a closed cross-section portion in the vehicle width direction formed on the back surface of the rising surface portion of the connecting portion between the rear end portion of the front floor and the front end portion of the rear floor. They are integrally stacked and formed , for example, within the door thickness at a position facing the side end surface of the upper closed cross section of the rear door.
(A) A reinforcement with a vehicle width direction dimension almost equal to the thickness is fixed, and the inner end surface of the reinforcement is configured to face the side end surface of the upper closed cross-section. In this case, a means is provided so that the inner end surface of the reinforcement is surely brought into contact with the side end surface of the upper closed cross section.

[0007]

According to the above, at the time of a side collision, the collision load is firmly received by the inner end surface of the reinforcement fixed in the rear door against the side end surface of the upper closed cross section, and the initial collision speed is significantly reduced. , The load is widely distributed from the upper closed cross section to the lower closed cross section and the rear floor,
The collision energy is effectively absorbed, and the impact on the passenger in the rear seat is greatly reduced.

[0008]

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

FIG. 1 shows a first embodiment of the present invention, in which 1 is a rear floor, and 2 is a rising surface portion formed at a connecting portion between a front end portion of the rear floor 1 and a rear end portion of the front floor 10. The cross section 2 in the vehicle width direction is formed on the rear surface of the rising surface portion 2 by fixing the cross member 2a as in the conventional case, and the rising surface portion 2 is reinforced and stiffened.
It is also conventional that the left and right end portions of the front floor 10, the rear floor 1, the rising surface portion 2, the cross member 2a, etc. are fixed to the inner surface portion of the side sill 4, which is a member having a closed cross section in the front-rear direction.

Reference numeral 5 denotes an upper cross member. The upper cross member 5 has a substantially hat-shaped cross section, and the upper cross member 5, which is an assembly member, is welded to the upper surface of the rear floor 1 above the closed cross section 3. By fixing, the upper closed cross section 6 in the vehicle width direction is formed above the closed cross section 3, and the left and right end surfaces 6a of the upper closed cross section 6 face the inner surface near the lower end of the rear door 7. A stopper member 6b made of a substantially wedge-shaped metal fitting is fixed to the left and right end surfaces 6a of the upper closed section 6 so as to project toward the rear door.

The rear door 7 is composed of an inner panel 71 and an outer panel 72, as is well known in the art.
The reinforcement 8 is fixed near the lower end portion between the inner panel 71 and the outer panel 72, and the inner end surface 8a of the reinforcement 8 is attached to the side end surface 6a of the upper closed cross-section portion 6 via the inner panel 71 and the door trim 73. And a concave portion 8b into which the wedge-shaped stopper member 6b is fitted and engaged is formed on the inner end surface 8a. The above-mentioned reinforcement 8 is
As shown in FIG. 1B, the reinforcement 8 of the rear door 7
It has a vehicle width direction dimension almost equal to the door thickness at the installation position,
The outer end of the reinforcement 8 is inside the outer panel 72.
The structure is such that it abuts on the surface or faces the surface very closely.
In FIG. 1 (B), 9 indicates a rear seat installed on the rear floor 1.

In the above, when the MDB collides from the side and the rear door 7 is pushed inward, the inner end surface 8a of the reinforcement 8 fixed within the thickness of the rear door 7 becomes a side end surface of the upper closed cross section 6. 6a to be firmly received and to greatly reduce the intrusion speed of the MDB at the initial stage of the collision, reduce the collision speed of the rear door 7 to the rear seat occupant seated on the rear seat 9, and reduce the impact on the occupant. You can Immediately after the collision, the rear door 7 is pushed by the MDB and is deformed and intrudes obliquely upward so as to ride on the rear floor 1. At that time, however, the wedge-shaped stopper member 6b protruding sideways is used to form the door trim 73 and the inner panel. 71, and the rear door 7 is fitted and engaged with the recessed portion 8b provided on the inner end surface 8a of the reinforcement 8.
The upward movement of the rear door 7 and the MDB is prevented from riding on the rear floor 1, and the inner end surface 8a of the reinforcement 8 surely hits the side end surface 6a of the upper closed cross section 6 to prevent the upper closed cross section 6 from moving. It firmly receives the collision load with axial force,
The load is widely dispersed to the lower closed cross section 3 and the rear floor 1, and the collision energy can be effectively absorbed.

FIG. 2 shows a second embodiment of the present invention.

That is, in the first embodiment, the inner end surface 8a of the reinforcement 8 is surely secured by the combination of the wedge-shaped stopper member 6b and the concave portion 8b of the reinforcement 8 so that the side end surface of the upper closed cross-section portion 6 is surely secured. 6a is shown, but in the second embodiment of the present invention shown in FIG. 2, a closed cross section 3 in the vehicle width direction formed on the back surface of the rising surface 2 is shown.
An upper closed cross-section 6 in the vehicle width direction is formed by welding and fixing an upper cross member 5 having a substantially hat-shaped cross section to the upper part of the vehicle. The inner end face 8a is located within the thickness of the rear door 7 and the side end face of the upper closed cross-section 6 is formed. 1 is the same as the embodiment of FIG. 1 described above, except that the reinforcement 8 is fixed so as to face 6a, but the combination structure of the stopper member 6b and the recessed portion 8b of FIG. 1 is omitted, and instead the rear door 7 is replaced. A projecting portion 71a projecting toward the vehicle interior is formed at a position facing the side end surface 6a of the upper closed cross-section portion 6 of the inner panel 71, and the reinforcement 8 is inserted in the projecting portion 71a with the inner end thereof. The structure is fixed within the thickness of the door, whereby the distance d between the side end surface 6a of the upper closed cross-section portion 6 and the inner end surface 8a of the reinforcement 8 is reduced, and the side surface is reduced by reducing the distance d. Rear door due to collision When but that has deformed penetrate obliquely upward inward, the inner end face 8a of the reinforcement 8 is top within the upward displacement of the rear door 7 is very small closed-section portion 6
The side end surface 6a is abutted.

Also in this example, as described above, the upper part is closed.
Of the side end surface 6a of the surface portion 6 and the inner end surface 8a of the phosphorus hose 8
The distance d is small, and as shown in FIG.
The outer end of the base 8 is inside the outer panel 72 of the rear door 7.
It has a structure that abuts against the side surface or faces the side surface very closely.
Since, the inner end face 8a of the reinforcement 8 during a side collision the collision load hitting ensure the side end face 6a of the upper closed sectional 6 Li
It can be firmly received by the axial force of the hose 8 and the upper closed cross section 6, and the rear door 7 and the MDB can be received by the rear floor 1.
Without getting on top, the initial collision speed can be greatly reduced and the impact on the occupant can be reduced,
The collision energy can be effectively absorbed.

In both of the first and second embodiments, the upper closed cross section 6 is formed on the rear surface of the rising surface 2 at the front end of the rear floor 1 and the conventionally known closed cross section 3 in the vehicle width direction. Since the upper closed cross-section portion 6 is formed by stacking on top of each other, the upper closed cross-section portion 6 is strongly reinforced and stiffened by the lower closed cross-section portion 3. Since the desired function can be sufficiently exerted against the collision load without making it too large, the upper cross member 5 forming the upper closed cross-section 6 is an assembled component, and the side collision countermeasure structure is provided. As a whole, it is lightweight and small in size, does not take up much space, can be attached easily and easily, and is extremely advantageous in terms of cost.

In each of the above-mentioned embodiments, the closed cross section 3 is formed by fixing the cross member 2a having a substantially L-shaped cross section to the rear surface of the rising surface section 2, but the closed cross section 3 is formed. The constituent means is not limited to these embodiments, and any conventionally known means can be adopted.

[0018]

As described above, according to the present invention, by adding a compact and lightweight structure, the collision load at the time of a side collision is firmly received, the initial collision speed is greatly reduced, and the collision energy is effectively reduced. It can be dispersed and absorbed to reduce the impact on the passengers in the rear seat, and in combination with the simple mounting and the low cost, it can bring about a great effect in practical use.

[Brief description of drawings]

1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a schematic perspective view of a front end portion of a rear floor, and FIG. 1B is a partial cross-sectional view showing a relational structure between a front end portion of a rear floor and a rear door. The front view shown by (C) is a cross-sectional view taken along the line CC of (B), (D).
FIG. 7B is a view on arrow D of FIG.

FIG. 2 shows a second embodiment of the present invention and is a front view showing a partial cross-sectional view of a relational structure between a front end portion of a rear floor and a rear door.

3A and 3B show an example of a general structure of a conventional rear floor portion, in which FIG. 3A is a perspective view of a front end portion of the rear floor, FIG. 3B is a front view showing a relational structure between the front end portion of the rear floor and a rear door, and FIG. 8B is a cross-sectional view taken along the line CC of FIG. 9B, and FIG. 9D is a front view illustrating a rear door deformation mode at the time of a side collision.

4A and 4B show another example of a front end portion of a conventional rear floor, in which FIG. 4A is a longitudinal sectional view and FIG. 4B is a front explanatory view.

[Explanation of symbols]

1 rear floor 2 Rising surface 2a Cross member 3 closed section 4 side sills 5 Upper cross member 6 Upper closed section 6a side end surface 6b Stopper member 7 Rear door 8 Reinforce 8a inner end surface 8b recess 9 Rear seat 10 front floor 71 Inner panel 71a protrusion 72 Outer panel 73 Door trim

Claims (3)

(57) [Claims] 1. An upper closed cross section in the vehicle width direction is provided on an upper part of a closed cross section in the vehicle width direction formed on a rear surface of a rising surface of a connecting portion between a rear end of a front floor and a front end of a rear floor. The stack is integrally formed, and within the door thickness at the position facing the side end surface of the upper closed cross section of the rear door, the door thickness at that position
The reinforcement is fixed so that its inner end face opposes the side end face of the upper closed cross-section, and the rear door is deformed inward by a side collision on the side end face of the upper closed cross-section. A structure for preventing side collision of a rear floor portion of an automobile, characterized in that a stopper portion is provided for suppressing a vertical shift of the rear door by being engaged with a concave portion formed on an inner end surface of the reinforcement. 2. An upper closed cross section in the vehicle width direction is provided on an upper part of a closed cross section in the vehicle width direction formed on a back surface of a rising surface of a connecting portion between a rear end of the front floor and a front end of the rear floor. The inner door of the rear door is formed by stacking integrally, and a projecting portion projecting toward the side end surface of the upper closed cross-section is formed at a position facing the side end surface of the upper closed cross-section of the inner panel of the rear door. the reinforcement, the inner end is an inner end surface of the reinforcement fitted inside the protruding portion of the inner panel close to the side end surface of the upper closed cross-section portion facing the inside, the phosphorus
The outer edge of the force is the inner surface of the outer panel of the rear door
A side collision preventing structure for a rear floor portion of an automobile, which is fixed so as to come into contact with or closely face each other . 3. The vehicle rear floor side collision prevention structure according to claim 1 or 2, wherein the upper closed cross section in the vehicle width direction is substantially above the front end of the rear floor above the closed cross section in the vehicle width direction. A structure for preventing side collision of a rear floor portion of an automobile, which is formed by fixing an upper cross member having a mold section by welding.