JP2001039347A - Reinforcing device for vehicle body locker part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locker part reinforcing structure having cross section strength, for avoiding to the utmost an influence to a production facility in mass production halfway and stable in strength of materials, for solving a problem for causing buckling between front and center pillars and increasing the deformation of the whole cab, at the time of offset collision. SOLUTION: A folded latelike locker reinforce 1 having a uniform cross section and a tubular support locker reinforce 2 are arranged as the inside reinforcing material for a locker part, and the reinforce 2 is welded to the reinforce 1. The reinforce 1 is joined as a reinforcing material in connection parts 1c and 1d only within a locker outer panel 4, and the reinforce 2 is joined as the reinforcing material only on the reinforce 1. Consequently reinforcing can be made without changing the basic layout of a locker and its peripheral member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field relating to a reinforcing structure for a vehicle body locker.

[0002]

2. Description of the Related Art FIG. 6 is a three-dimensional perspective view showing the positional relationship of an opening member for a door of a vehicle body. The front pillar 6, the center pillar 7, and the floor 8 are joined by the rocker unit 5,
An opening for a door is formed on a side surface of the vehicle cabin.
The locker portion 5 is a member which is disposed symmetrically at each of the left and right ends of the lower surface of the floor, and contributes to reinforcing the rigidity of the body. When a vehicle collides, a force acts to move the tire backward to deform the body, but the deformation of the body is suppressed to some extent mainly by the longitudinal buckling rigidity of the front floor 8 and the rocker portion 5. It has a structure.

FIG. 7 shows a cross-sectional structure of the locker section 5 as viewed from the line BB in FIG. The rocker inner panel 3 and the rocker outer panel 4 are spot-welded at the connection portions 11 and 12, thereby forming a tubular locker portion 5 having a hollow closed cross section. Although a compressive load is applied in the longitudinal direction of this member at the time of a frontal or offset collision of the vehicle, the deformation of the body is suppressed by the buckling resistance of the rocker portion 5 and the front floor 8. At the time of a collision, particularly an offset collision, a larger load is applied to the rocker portion 5 than at the time of a uniform frontal collision. Therefore, in order to further reduce the amount of deformation of the body, a longitudinally folded plate-like reinforcing member 9 or 10 is further provided inside the rocker member. Alternatively, both of them are added to increase the buckling resistance.

The embodiments disclosed in Japanese Utility Model Publication Nos. 60-49078 and 64-49483 are also methods of additionally reinforcing the folded plate-like member inside the rocker member as described above.

[0005]

Conventionally, in a collision, particularly in an offset collision, buckling occurs between the front pillar 6 and the center pillar 7 due to a change in the cross section of the reinforcing material inside the rocker or a lack of strength, and the entire cab is deformed. Was causing it to grow larger. Although it is possible in terms of strength design to significantly change the dimensions of the components, and thus the external dimensions for the purpose of reinforcement, it is necessary to rebuild the entire production process, and waste resources such as previous material equipment and waste. To increase the cost, it is required that the buckling stiffness be increased without largely changing the basic dimensions and shape of the rocker portion 5. Accordingly, in general, to reinforce the rocker portion, as shown in FIG. 7, the flange portions 11 and 12 which are connection surfaces of the rocker inner panel 3 and the rocker outer panel 4 are provided.
During the mass production, the increase in the thickness of the mating plates of the insertion portions 11 and 12 tends to cause deterioration in welding quality and eventually a problem in strength. It is inevitable that changes and other effects on equipment will be considerably large.

That is, in order for the reinforcing material of the prior art to exhibit the expected effect, in terms of production technology, the reinforcing material 9 is required at the joints 11 and 12 of the rocker inner panel 3 and the rocker outer panel 4 in FIG. Must be firmly joined, and the joints 11 must be further securely joined to the floor material. Further, in terms of design, it is necessary to form a material-mechanical uniform cross section as long as possible in order to prevent buckling. However, in the prior art shown in FIG. 7, the welding thickness and the number of the joints 11 and 12 are increased from the viewpoint of production technology. If not changed, disadvantageous problems remain such as weldability, weld strength, welding distortion, deformation due to residual stress, and fatigue fracture. Further, in terms of design, the joints 11 and 12 are often slightly curved in the longitudinal direction due to the design of the body outer shape, so that the reinforcing material is more likely to be a curved material that is less advantageous for buckling than a straight material. In addition, since the internal reinforcing material is joined along the curvature of the rocker in the longitudinal direction, a reduced cross-section may have to be provided in a part of the internal reinforcing material in the longitudinal direction. It is disadvantageous in buckling strength.

Further, Japanese Utility Model Publication No. Sho 60-4907.
8, and in the embodiment disclosed in Japanese Utility Model Publication No. 64-49483, a problem is apt to occur in the quality control of welding at the joint in the same manner as in FIG. In addition, a part of the reinforcing material on the folded plate is further welded on the inner surface of the outer rocker panel. In this structure, it is necessary to join three or more longitudinal sheet metal members in the longitudinal direction. Therefore, disadvantageous problems such as size adjustment, weldability, weld strength, welding distortion, deformation due to residual stress, fatigue fracture, etc. as the whole rocker. Will occur. In order to solve the above-mentioned problems in the production technology, it is necessary to change even the basic design structure of the vehicle, the production process, and the equipment, resulting in waste of resources such as previous material equipment and high cost.

In order to solve the above-mentioned problems, the present invention makes effective use of the hollow cross section inside the locker, and in terms of production technology, minimizes the influence on production equipment during mass production. An object of the present invention is to provide a rocker portion reinforcing structure having a stable cross-sectional strength in terms of material mechanics.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention combines a pillar and a floor forming a vehicle door opening / closing opening at a body part forming a side surface of a vehicle cabin. A hollow closed-section tube having two or more rocker panels each having a connection flange in a longitudinal direction and being connected to each other at the flange portion, which is a structure of a rocker portion that is a member for reinforcing the rigidity of the body at each of the left and right ends of the lower surface. Shape member, a rocker reinforce, which is a folded plate member having a uniform cross section in the longitudinal direction, is fixed to one inner surface of the rocker panel except for a connection flange surface,
A hollow cylinder having a uniform cross section is further fixed in the longitudinal direction of the surface of the rocker reinforce, which is the folded plate member having a uniform cross section, and the hollow cylinder is fixed in a longitudinal direction of the surface of the rocker reinforce, which is the folded plate member having a uniform cross section. It is intended to create a reinforcing structure for a vehicle body locker portion provided with a concave portion for accommodating about half of the circumference.

[0010]

FIG. 1 is a perspective view of an external appearance of a vehicle body according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the vehicle body rocker portion 5 of FIG. Since one locker portion 5 is disposed in each of the left and right ends on the lower surface of the floor in a contrasting shape, there is a cross section of the contrasting shape in FIG.
In FIG. 2, a rocker inner panel 3 and a rocker outer panel 4 are flange-connected at 5a and 5b to form an outer contour of a rocker portion 5 having a hollow closed cross section. Folded plate-shaped rocker reinforce 1 with uniform cross section as internal reinforcement
And a cylindrical support rocker reinforce 2. The rocker reinforcement 1 is welded to the outer rocker panel 4 at 1c and 1d. The support rocker reinforce 2 is welded to the rocker reinforce 1 at 1b. The rocker reinforce 1 is further formed with a pocket portion 1a along the longitudinal direction to facilitate the work positioning of the welded portion 1b and to ensure the strength reliability of the welded portion 1b. The rocker reinforce 1 and the support rocker reinforce 2 shown in FIG. 1 show the positional relationship with the rocker portion 5 before welding.

FIG. 3 is a perspective view showing a state before the rocker reinforce 1 and the support rocker reinforce 2 are welded. FIG. 4 is a three-dimensional perspective view showing a state where the rocker reinforce 1 and the support rocker reinforce 2 are welded. FIG. 5 shows the welded rocker reinforce 1 and support rocker reinforce 2
It is a three-dimensional perspective view of the state fixed by welding in the closed cross section comprised of the rocker inner panel 3 and the rocker outer panel 4.

The rocker reinforce 1 is provided only in the outer rocker panel 4 and has connection flanges 5a and 5b.
, The support rocker reinforce 2 is connected as a reinforcement only on the rocker reinforce 1 at the connecting portions 1c and 1d. Therefore, reinforcement can be performed without changing the basic layout of the locker 5 and its peripheral members. Since the reinforcing member does not cut into the flange joint portions 5a and 5b of the inner rocker panel 3 and the outer rocker panel 4 as seen in the prior art, the quality of the reinforcing portion of the rocker 5 can be ensured and there is no disadvantage in production technology. On the other hand, in terms of strength design, substantially all of the hollow section of the rocker outer panel 4 is used to form a strong straight-section straight beam without being affected by the shapes of the flange joints 5a and 5b.
Since they can be joined, the buckling resistance of the rocker portion 5 is significantly improved. With the above structure, buckling of the lower end of the door opening due to the rearward movement of the tire at the time of an offset collision is less likely to occur at the front of the rocker 5 and can be moved to the rear of the center pillar 7. That is,
The deformation of the side surface of the body and the front side of the center pillar of the floor can be suppressed by the buckling resistance of the rocker portion 5.
This is effective in improving occupant protection and reducing impact values, and leads to improvement in rigidity around the front floor.

FIG. 8 shows a difference in body deformation at the time of collision depending on the presence or absence of the collision-resistant reinforcing structure using the rocker reinforcing structure of the present invention.
Shown in The vertical axis indicates a value obtained by measuring or calculating the amount of deformation movement of the deformation measurement target part at the time of an experimental collision from a fixed reference position inside the vehicle, and the horizontal axis indicates the name of the deformation measurement target part.
A broken line a in FIG. 8 indicates a case without reinforcement, and a broken line b indicates a case with a collision-resistant reinforcing structure using the rocker reinforcing structure according to the present invention. It can be seen that the effect of the collision-resistant reinforcement structure using the rocker reinforcement structure according to the present invention on the body at the time of collision is great.

[0014]

1) The folded plate-shaped rocker reinforce is joined only as a reinforcing material in the outer rocker panel, avoiding the connection flange, and the cylindrical support rocker reinforce is folded plate-shaped rocker reinforce. Only the top is joined as reinforcement. Therefore, reinforcement can be performed without changing the basic layout of the locker and its peripheral members. Therefore, since the reinforcing member does not cut into the joining flange portions of the inner rocker panel and the outer rocker panel as seen in the prior art, the quality of the reinforcing portion of the rocker can be ensured and there is no disadvantage in production technology. 2) In terms of strength design, substantially all of the hollow section of the rocker outer panel is used to form a solid beam with a uniform cross section without being affected by the shape of the joint between the rocker outer panel and the rocker inner panel. , The buckling resistance of the rocker portion is significantly improved. 3) With the above structure, buckling of the lower end of the door opening due to the rearward movement of the tire at the time of an offset collision is less likely to occur at the front part of the rocker part, and can be moved to the rear part of the center pillar. That is, the deformation of the side surface of the body and the front side of the center pillar of the floor can be suppressed by the buckling resistance of the rocker portion, which leads to an improvement in rigidity around the front floor.

[Brief description of the drawings]

FIG. 1 is an assembled perspective view of a vehicle body according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 showing a rocker portion reinforcing structure according to the present invention.

FIG. 3 is a three-dimensional perspective view of a rocker part reinforcing material element according to the present invention.

FIG. 4 is a three-dimensional perspective view of a rocker part reinforcing material element according to the present invention after being joined.

FIG. 5 is a three-dimensional perspective view of a rocker part reinforcing assembly joining structure according to the present invention.

FIG. 6 is a three-dimensional perspective view of a body having a conventional locker portion.

FIG. 7B shows a conventional rocker part reinforcement structure of FIG.
_B sectional drawing.

FIG. 8 is a diagram showing a difference in body deformation at the time of a collision depending on whether or not a rocker portion is reinforced according to the present invention.

[Explanation of symbols]

 1 Rocker Reinforce 1a Pocket 1b Weld 1c Rocker Reinforce 1d Rocker Reinforce 2 Support Rocker Reinforce 3 Rocker Inner Panel 4 Rocker Outer Panel 5 Rocker 5a Rocker Flange 5b Rocker Flange 6 Front Pillar 7 Center pillar 8 Floor

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor: You Yamamoto, Dosawa 8 Fujisawa-shi, Kanagawa Pref. Isuzu Motors Fujisawa Plant Co., Ltd. F term in the factory (reference) 3D003 AA01 AA11 BB01 CA14 CA17 CA33 CA34

Claims (1)

[Claims] 1. A member for connecting a pillar and a floor forming an opening and closing portion of a door of a vehicle at a portion of a body constituting a side surface of a vehicle cabin and for reinforcing rigidity of the body at right and left ends of a lower surface of the floor. A structure of a rocker portion, wherein a hollow closed-section tubular member formed by connecting two or more rocker panels having connection flanges in a longitudinal direction to each other at the flange portion is one inner surface of the rocker panel. A rocker reinforce, which is a folded plate member having a uniform cross section in the longitudinal direction, is fixed to the surface excluding the connection flange surface, and a rocker reinforce, which is a folded plate member having the uniform cross section, has a further uniform cross section in the longitudinal direction. Secure the hollow cylinder,
A reinforcement structure for a vehicle body rocker portion, wherein a recess for accommodating about half of the circumference of the hollow cylinder is provided in a longitudinal direction of a surface of the rocker reinforcement, which is the folded plate member having a uniform cross section.