JP2606585Y2 - Automotive body reinforcement members - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member for reinforcing a vehicle body such as a door impact beam incorporated in a door of an automobile.

[0002]

2. Description of the Related Art Door impact beams are known as means for reinforcing automobile doors. The door impact beam is disposed in the front and rear direction inside the door panel structure, and plays a role of increasing the rigidity of the door against a load applied from the side of the door. Energy acting on the door at the time of a side collision is absorbed by plastic deformation of the door impact beam.

[0003] The door impact beam has a desired function by fixing both ends thereof to an inner panel of a door panel structure. In the case of a door impact beam using a steel pipe, a door impact beam is used. Is commonly welded to the inner panel of the door via a bracket welded to the end of the door.

Further, as described in Japanese Patent Application Laid-Open No. 4-78720 (Prior Art 1), there is a type in which a terminal member processed separately from a beam main body is joined to the beam main body by friction welding or the like. Further, as disclosed in Japanese Utility Model Application Laid-Open No. 62-78519 (Prior Art 2), there has been proposed a device in which a terminal mounting portion is integrally provided at an end of a beam main body.

[0005]

In the case of the above-mentioned prior art 1, two types of parts, ie, a beam main body and a terminal member, must be separately manufactured and then joined together. , Leading to increased costs.
In the case of the prior art 2, the thickness of the terminal attachment portion is equal to or greater than the thickness of the beam main body, and the thickness of the beam main body is generally 2 mm or more in strength. The thick terminal mounting part does not conform to the welding conditions of a spot welder in a normal door assembly line, so it is necessary to set different welding conditions, which also requires a special welding process, etc. Connect. In addition, when a thick reinforcing member that satisfies the required strength is spot-welded to a relatively thin panel structure such as a door frame, the difference in thickness between the reinforcing member and the panel structure is small. In some cases, it is too large to apply spot welding. In addition,
Simply crush flat as described in FIG. 7 of Technique 2.
Spot welding the terminal mounting part just to the mating surface
When the terminal mounting part and the mounting
Paint is less likely to get into the rim and rust is more likely to occur
You.

Accordingly, the object of the present invention is to reduce the number of parts,
It is another object of the present invention to provide a vehicle body reinforcing member that can be fixed to a panel structure by ordinary spot welding.

[0007]

SUMMARY OF THE INVENTION The present invention, which has been developed to achieve the above object, is a vehicle body reinforcing member disposed inside a panel structure of a vehicle body, the member extending along the front-back direction of the panel structure. It is arranged Te bi - and arm body, respectively provided at both ends of the beam body and the panel structure bi
A beam mounting portion to be spot-welded to the beam mounting surface , wherein the beam body and the terminal mounting portion are made of a single steel hollow material, and the terminal mounting portion is formed of the hollow material. The both ends of the beam are flattened and formed wider than the beam main body , and the terminal mounting portion is between the beam mounting surface and
A first portion forming a recess in the first portion, and
Projecting toward the beam mounting surface and
The second part, which is thinner than the wall thickness, is
The second shape is formed alternately in the
Is spot-welded to the beam mounting surface.
Characterized in that was.

[0008]

The body reinforcing member of the present invention is formed by flattening both ends of the steel pipe by plastic working such as pressing or rolling, or by processing such as cutting out the end of the steel pipe, so that the beam main body and the terminal mounting part can be formed. Are integrally formed. Therefore, only one component is required. The terminal attachment portion is a second portion thinner than the thickness of the beam main body, such as a door panel structure.
Spot welded to the beam mounting surface . If the thickness of the terminal mounting part is 1.6mm or less, it is possible to use a spot welder used in a normal door assembly line and perform welding under the same conditions. The present invention can also be applied to places where it is necessary to reinforce the side of the vehicle body other than the door.

[0009]

Embodiments of the present invention will be described below.
As shown in FIG. 1, a door impact beam 3 as an example of a vehicle body reinforcing member is provided inside a door panel structure 2 constituting a door 1 of an automobile. The door panel structure 2 is a combination of a well-known steel outer panel 5 and an inner panel 6.

The door impact beam 3 includes a beam main body 10 arranged along the front-rear direction of the door panel structure 2.
And terminal attachment portions 11 and 12 formed at both ends in the longitudinal direction of the beam main body 10. As shown in FIGS. 2 and 3, the beam main body 10 and the terminal mounting portions 11 and 12 in the illustrated
Is an integral body made from one hollow member 20. That is, by forming both ends of the hollow member 20 made of steel into a flat shape by the following plastic working or the like, the terminal mounting portions 11, 1 are formed.
2 and the beam main body 10 is left as the hollow member 20 between the terminal attachment portions 11 and 12.

As shown in FIG. 4, the cross section of the hollow member 20 is made up of four flat sides 21 having the same length and four rounded corners 22, and has a substantially square shape. Has made. The thickness T1 of the hollow member 20 is
It is constant in the longitudinal direction (axial direction) of the hollow member 20. Practically, the length D of one side is 20 mm or 40 mm, and the thickness T1 is 2.0 to
4.0 mm and the radius of curvature R is 4 to 8 mm. An example of the material of the hollow member 20 is carbon steel to which boron is added, and a heat treatment by induction hardening is applied to a range over substantially the entire length L1 of the beam main body 10 to facilitate post-processing. It is preferable to provide a non-heat-treated portion at the end. If necessary, tempering may be performed after quenching.

When forming the terminal mounting portions 11 and 12, both ends of the hollow member 20 are expanded to reduce the thickness of the ends, and then flattened by a press or flattened by a press. After crushing, the thickness may be reduced by rolling. FIG. 6 shows one terminal mounting portion 11.
As a representative, the thickness T of the terminal mounting portions 11 and 12
Numeral 2 is smaller than the thickness of the hollow member 20, that is, the thickness T1 of the beam body 10. The thickness T2 of the terminal attachment portions 11 and 12 is set to 1.6 mm or less so that welding can be performed with a normal spot welding machine without changing welding conditions.

The above-mentioned plastic working of the terminal mounting portion 11 is preferably performed hot while the end of the hollow member 20 is locally heated. The terminal mounting portions 11 and 12 that are not heat-treated are
The above plastic working can be easily performed. Since the bending moment generated in the door impact beam 3 due to the impact load from the side does not substantially act on the terminal mounting portions 11 and 12, even if the terminal mounting portions 11 and 12 are not subjected to the heat treatment, the bending strength is not increased. no problem.

As shown in FIG. 1, one terminal mounting portion 11 is fixed to the rear frame portion 6a of the inner panel 6 by spot welding. The other terminal mounting portion 12 is spot-welded to the front frame portion 6b of the inner panel 6. Reference numerals 25 and 26 shown in FIG. 2 indicate spot welds, respectively. The terminal mounting portions 11 and 12
May be spot-welded to an appropriate reinforcing member (not shown) fixed to the door panel structure 2.

As shown in FIGS. 7 and 8,
The terminal attachment portions 30 and 31 may be provided at positions offset from the center axis M of the beam main body 10. Again,
The thickness T2 of the terminal attachment portions 30, 31 is smaller than the thickness T1 of the beam main body 10, and is 1.6 mm or less.

9 and 10, the end portion of the hollow member 20 is cut open along the length L2 and is formed flat over the width W1, and the thickness T2 of the end mounting portion 40 is reduced to the thickness of the beam main body 10. The thickness is made thinner than T1 to enable spot welding to the door panel structure. When performing such a slitting process, it is possible to perform the process for providing the cut portion 41 cold. Also in this case, the end processing can be facilitated by not performing the heat treatment on the end of the hollow member 20.

In the embodiment shown in FIGS. 11 and 12, a second cut 52 is provided at the center in the width direction of the terminal mounting portion 50 cut and opened by the first cut portion 51. The width W2 of 50 can be made wider than the width W1 of the terminal mounting portion 40 in the embodiment of FIG. This terminal mounting part 50 is also 1.6mm
The thickness is reduced to the following thickness.

The embodiment shown in FIGS.
In the cut-out terminal mounting part 60, by pressing
A first portion 61, a thin wall thickness than the first portion 61
To the beam mounting surface 2a of the door panel structure 2.
The protruding second portion 62 protrudes from the terminal mounting portion 60.
Are formed alternately in the width direction . So this terminal mounting
As shown in FIG. 15, the portion 60 has an uneven cross-sectional shape.
None, recess between first portion 61 and beam mounting surface 2a
61a will be formed. The thickness T3 of the first portion 61 is equal to or smaller than the thickness T1 of the beam body 10. The thickness T4 of the second portion 62 is T3
Thinner than 1.6mm. And FIG.
5, the second portion 62 is spot-welded to the beam mounting surface 2 a of the door panel structure 2.
In this case, the thickness T3 of the first portion 61 is
May be equivalent to the thickness T1 of

[0019]

[Effect of the Invention] The beam main body of the vehicle body reinforcing member of the present invention is an integral body manufactured using one steel pipe, so that the number of parts is small, and it is handled when carrying, delivering or storing. Since it can be easily welded to a door panel structure or the like under ordinary spot welding conditions, it is effective in reducing costs. And according to the present invention,
When spot-welding a reinforcing member having a thick beam body having a required strength to a relatively thin panel structure such as a door frame, the panel structure and a terminal attachment which is a member to be welded thereto are spot-welded. Since the difference in wall thickness with the part can be made as small as possible, spot welding can be applied without any problem. In the present invention, the thickness of the terminal attachment portion is smaller than that of the beam main body. However, since the terminal attachment portion has a wide shape, the required strength of the terminal attachment portion is secured.
Also, this terminal attachment portion has a bead at the second portion of the convex shape.
Spot welded to the
Recess that allows paint to enter between the
Is formed, the spot welded portion
Rust can be prevented by the paint reaching the vicinity.

[Brief description of the drawings]

FIG. 1 is a door impact vehicle showing a first embodiment of the present invention.
FIG. 2 is a perspective view showing a door provided with a system, with a part thereof omitted.

FIG. 2 is a front view of the door impact beam shown in FIG.

FIG. 3 is a plan view of the door impact beam shown in FIG. 1;

FIG. 4 is a sectional view taken along the line aa in FIG. 2;

FIG. 5 is a front view of a terminal mounting portion of the door impact beam shown in FIG. 1;

FIG. 6 is a sectional view taken along the line bb in FIG. 5;

FIG. 7 is a door impact view showing a second embodiment of the present invention.
FIG.

FIG. 8 is a sectional view of a terminal attachment portion of the door impact beam shown in FIG. 7;

FIG. 9 is a door impact view showing a third embodiment of the present invention.
FIG.

FIG. 10 is a sectional view taken along the line cc in FIG. 9;

FIG. 11 is a front view of a terminal mounting portion of a door impact beam according to a fourth embodiment of the present invention.

FIG. 12 is a sectional view taken along the line dd in FIG. 11;

FIG. 13 is a front view of a terminal mounting portion of a door impact beam according to a fifth embodiment of the present invention.

FIG. 14 is a sectional view taken along the line ee in FIG. 13;

FIG. 15 is a sectional view taken along the line ff in FIG. 13;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Door, 2 ... Door panel structure, 3 ... Door impact beam (body reinforcement member), 6 ... Inner panel, 10 ...
Beam main body, 11, 12 ... terminal mounting part, 20 ... hollow material,
30, 31 ... terminal attachment part, 40, 50, 60 ... terminal attachment part.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60J 5/00

Claims (4)

(57) [Scope of request for utility model registration] 1. A body reinforcing member disposed inside a panel structure of a vehicle body, the beam body being disposed along a front-rear direction of the panel structure, and a beam main body disposed at both ends of the beam body. Provided and beam mounting of the panel structure
A beam attachment portion to be spot-welded to the surface , wherein the beam body and the terminal attachment portion are an integral body made of a single steel hollow material, and the terminal attachment portions are both ends of the hollow material. Is flattened and molded to be wider than the beam body ,
The terminal mounting portion has a recess between the beam mounting surface.
A first part to be formed and the beam from the first part
Projects toward the mounting surface and exceeds the thickness of the beam body
Alternate with the thin second part in the width direction of the terminal mounting part
To form an uneven cross section, and the second portion is
A member for reinforcing a vehicle body of an automobile, wherein the member is spot-welded to the beam mounting surface . 2. The member for reinforcing a vehicle body according to claim 1, wherein the terminal attachment portion is processed to a thickness of 1.6 mm or less. 3. The reinforcement for a vehicle body according to claim 1, wherein the end mounting portion is formed by cutting an end portion of the hollow member to a predetermined length, forming the end portion flat, and making the end portion thinner than the thickness of the beam main body. Element. 4. A first portion having a thickness equal to or less than a thickness of the beam main body and a second portion thinner than the first portion are alternately provided on the terminal mounting portion, The vehicle body reinforcing member according to claim 1, wherein the second portion is spot-welded to the panel structure.