JPH0986172A - Door guard bar for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add necessary strength and rigidity to a door guard bar in a narrow space by forming at least two circular tube parts extended along a longitudinal axial line in a beam part in the door guard bar provided in a door space so as to be extended back and forth. SOLUTION: A door guard bar 20 attached in a door space plotted by the outer door panel and the inner door panel of an automotive door is provided with a beam part 21 extended over the full length of back and forth directions and fixed to the door by welding or the like in end part brackets 22 and 22 provided in both ends of this beam part 21. This door guard bar 20 is formed by press-machining one piece of plate and in this case, two circular tube parts 22 and 23 semi-circular in section are formed in the center part of the beam part 21. These circular tube parts 23 and 23 are interconnected by a middle connection part 24 and thus, desired strength is secured by using an inexpensive material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle door guard bar which prevents a vehicle door from being greatly deformed or damaged toward the interior when a side collision of the vehicle is ensured and ensures the safety of passengers.

[0002]

2. Description of the Related Art In recent years, with the increasing demand for safety of automobiles, automobile doors are also required to have high rigidity and strength and excellent shock absorption. An automobile door provided with such safety measures is an automobile made of a high-strength steel material that has high rigidity and strength and is lightweight so as to extend in the front-rear direction of the vehicle in a door space formed by a door panel. A door guard bar is installed.

Various types of door guard bars have been proposed in the past, but as shown in FIG. 12, mainly, a central beam portion 1 is made of a pipe material, and end brackets 2 and 2 are provided at both ends thereof. Welded together, or as shown in FIG. 13, one pipe-shaped beam portion 1 having end brackets 2 and 2 at both ends, which are integrally formed by press-forming one plate material. (JP-A-4-23
As shown in FIG. 14, a corrugated plate 4 having one or a plurality of peaks 3 each having a U-shaped cross section over the entire length is joined to a contact plate 6 having a patch 5 by spot welding or the like. (Japanese Patent Laid-Open No. 5-213,127
(See Japanese Patent Publication).

[0004]

However, not only a space for accommodating the window glass must be formed in the door space of the automobile door, but also a drive mechanism for raising and lowering the window glass must be provided. So
The space where the automobile door guard bar can be installed is extremely small. In order to provide the automobile door guard bar with the necessary strength and rigidity in such a small space, the pipe with one beam is used. The shaped material requires the use of a high-strength material, which may increase the cost.

Further, if the beam portion is formed by a single pipe, the beam portion has a constant cross-sectional shape over the entire length, so that excessive material is generated in the vicinity of the end portion and the strength characteristic of the beam portion in the longitudinal direction is improved. It can be difficult to change depending on the location. There are some pipe-shaped beam portions that have been subjected to a quenching treatment. However, although this improves the strength, there is also the problem that warpage tends to occur during quenching.

Furthermore, a corrugated plate having one or a plurality of peaks each having a U-shaped cross section over the entire length and joined with a patch plate by spot welding or the like has a structure for joining a composite member including the patch. Moreover, since a troublesome welding process is required, the product is expensive.

The present invention has been made in view of the above problems, and the strength and rigidity are not deteriorated, and the strength characteristics can be appropriately adjusted depending on the location, a welding process is not required, and molding is easy. Another object of the present invention is to provide a low-cost, lightweight automobile door guard bar.

[0008]

A vehicle door guard bar according to the present invention for achieving the above object is provided so as to extend in the front-rear direction in a door space formed by a door panel of a vehicle door. A door guard bar for an automobile, which is formed by press-forming one plate with an end bracket connected to the door panel and a beam part provided between the end brackets. Of at least two circular tubular portions extending along the longitudinal axis are formed in the entire length or a part thereof, and these circular tubular portions are mounted so as to be vertically positioned in the door space. The invention according to claim 2 is characterized in that the circular tubular portion of the beam portion is formed at a predetermined length in the central portion in the longitudinal direction. The invention according to claim 3 is characterized in that the circular tubular portions of the beam portion are integrally connected by an intermediate connecting portion. The invention according to claim 4 is characterized in that a portion of the beam portion extending from the longitudinal end portion of the circular tubular portion toward the end bracket is gradually reduced in thickness of the beam portion. The invention according to claim 5 is characterized in that a reinforcing member is provided so as to contact the inside or the outside of the circular tubular portion of the beam portion. The invention according to claim 6 is characterized in that the reinforcing member is fixed to the beam portion by an embossed portion formed by pressing the intermediate connecting portion.

[0009]

According to the first aspect of the present invention, when a door guard bar for an automobile is formed by press working, if at least two circular tubular portions are formed in the entire length or a part of the beam portion, the strength characteristic is one pipe. This is a significant improvement over the beam portion, and the desired strength can be maintained even if a lower strength material, that is, an inexpensive material is used, which makes the guard bar inexpensive to manufacture. Since it is a press-molded product, the overall weight of the automobile door guard bar can be reduced. Further, even if the door space of the automobile door is narrowed for various reasons, there is a relatively large space in the vertical direction, so if the circular tubular parts are arranged vertically in the door space, The guard bar can be stored using the extra space in the space, and can be stored without lowering the strength characteristics of the beam part. According to the second aspect of the present invention, since the circular tubular portion is formed to have a predetermined length in the central portion in the longitudinal direction, the strength characteristic of the central portion in the longitudinal direction of the beam portion, which requires the most strength, is improved. In the invention according to claim 3, since at least two circular tubular portions are integrally connected by the intermediate connecting portion,
The strong tubular portion spreads in the vertical direction, and a more safe product can be obtained. Moreover, if the intermediate connecting portion is present during press molding, it becomes easy to mold a plurality of tubular portions, and the moldability during press molding is improved. In the invention according to claim 4, since the thickness of the portion extending from the longitudinal end of the circular tubular portion of the beam portion is gradually reduced, when both ends of the vehicle door guard bar are supported in the door space, The beam part does not have a constant cross-sectional shape over the entire length, the central part in the longitudinal direction becomes thicker, the cross-sectional shape gradually changes from the circular tubular part of the central part of the beam part, the central part has the desired strength, the end part Can be shaped so that the strength changes as it approaches, and it becomes excellent in terms of strength and rigidity, and there is no excess material near the ends. It is also possible to change the strength characteristics depending on the location. In the invention according to claim 5, since the reinforcing member is provided so as to come into contact with the inside or outside of the circular tubular portion of the beam portion, the most strength and rigidity are required when the vehicle door guard bar is mounted with both ends supported. The strength and the like of the central portion can be further increased. In the invention according to claim 6, when connecting the reinforcing member and the beam portion, a part of the intermediate connecting portion is pressed during press molding to form an embossed portion, and the embossed portion connects the reinforcing member and the beam portion. Since the connection is made, it is possible to connect the reinforcing member and the beam portion without welding, and welding distortion does not occur, so that the automobile door guard bar is excellent in accuracy and has good molding workability. Become.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the embodiments shown in the drawings. (Embodiment 1) FIG. 1 is a schematic front view of an automobile door, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a section 3-3 of FIG.
FIG. 3A is a cross-sectional view taken along the line, FIG. 3A shows an example in which the end bracket is formed straight, FIG. 3B shows an example in which one of the end brackets is bent, and FIG. 1 is a perspective view of a vehicle door guard bar according to a first embodiment of the invention;
5 is a sectional view taken along line 5-5 of FIG. 4, FIG. 6 is a side view of FIG. 4, and FIG. 7 is a sectional view taken along line 7-7 of FIG.

1 to 3, the vehicle door 10 is
The outer door panel 11 and the inner door panel 12 are formed integrally with each other.
In addition to the space 15 for housing the window glass 14, the drive mechanism 16 for moving the window glass 14 up and down, etc., the door guard bar 20 for an automobile is also housed in the door space 13 defined by the above.

The vehicle door guard bar 20 preferably has a considerably large width in the vertical direction in order to ensure the safety of passengers in the event of a side collision, and the length in the front-rear direction is extended over the entire length in the front-rear direction of the door space 13. Preferably. Therefore, as shown in FIG. 3a, the door guard bar 20 has a beam portion 21 extending over the entire length of the door space 13 in the front-rear direction, and end brackets 22 provided at both ends of the beam portion 21. Two
2, the outer door panel 11 and the inner door panel 12 are fixed to each other by fixing means such as welding. However, in some cars, the rear end bracket 22 is bent as shown in FIG. 3B in order to attach the door lock mechanism 17 to the rear side R of the door. Note that “Fr” in FIG. 3 indicates the front side.

As shown in FIG. 4, the door guard bar 20 for an automobile according to the first embodiment of the present invention has end brackets 22, 22 connected to the door panels 11, 12 by pressing one plate. Also, the beam portion 21 is formed. If the door guard bar 20 is formed by press molding, the overall weight can be reduced and a preferable product can be obtained.

The beam section 21 of the first embodiment is shown in FIG.
As shown in 5, in a part in the longitudinal direction, that is, in the central part,
Two circular tubular portions 23, 23 having a semicircular cross section are formed,
A shape in which these circular tubular portions 23, 23 are connected by the intermediate connecting portion 24, that is, a cross-sectional shape is formed into a so-called eyeglass shape.

When the door guard bar 20 is formed by press working, if two circular tubular portions 23, 23 are formed in the central portion of the beam portion 21 in the longitudinal direction, the longitudinal center portion of the beam portion 21 where the strength is required most is required. The strength characteristics of the part are significantly improved as compared with the one-pipe beam part, and the desired strength can be maintained even if the material having a lower strength, that is, an inexpensive material is formed as a whole, and the manufacturing cost is low. it can.

The door guard bar 2 of the first embodiment is also used.
As for 0, the portion extending from the central portion in the axial direction toward the end brackets 22, 22 is not formed in the above-described circular tube shape, but is formed so as to gradually reduce the thickness t of the beam portion 21 as shown in FIG. There is. As shown in FIG. 7, the cross-sectional shape of this portion is such that two U-shaped sections 25, 25 are formed in the intermediate connecting portion 2.
4 is a connected shape.

As described above, if the beam portion 1 does not have a constant cross-sectional shape over the entire length and the thickness t near the ends is thinned, when both ends are supported, the central portion in the longitudinal direction of the beam portion 21 is thick and the center portion is large. The cross-sectional shape gradually changes from the end to the end, the central part has the desired strength, and the strength changes as it approaches the end, ensuring the safety of the occupant in a side collision. Therefore, it is excellent in terms of strength and rigidity. Moreover, excess material does not occur near the edges.

Therefore, depending on the form of use, the strength characteristics in the longitudinal direction of the beam portion 21 can be appropriately changed depending on the location. For example, when different door guard bars are used for different vehicle types, the circular tubular portion is used. A door guard bar having a desired strength can be obtained only by adjusting the length of 23.

A circular tubular portion 23 of the beam portion 21
Can be formed in the order of steps shown in FIG. 8A to 8E are main-portion cross-sectional views showing the molding state of the first embodiment for each step.

First, as shown in FIG. 8a, a flat plate P is placed between upper and lower press dies (not shown), and an intermediate connecting portion 24 is formed at the center. Next, as shown in FIG. 8B, the tip of the flat portion Pa other than the intermediate connecting portion 24 is curled by about 90 ° with a predetermined radius.

After the middle of the curl portion 26 and the intermediate connecting portion 24 is bent at 90 ° as shown in FIG. 8c,
As shown in FIG. 8d, the bottom piece 27 is flattened, and as shown in FIG. 8e, the curl portion 26 is further curled, and the door guard bar 20 is formed by applying pressure until the tip comes into contact with the intermediate coupling portion 24. be able to.

As a result, the beam portion 21 having the circular tubular portion 23 can be formed without performing the welding work, and the finished product does not cause the welding distortion, and the guard bar is excellent in accuracy and forming workability. can get.

In order to mount the automobile door guard bar 20 thus formed in the interior space 13 of the automobile door, both end brackets 21 and 21 are joined to each other by screws or welding to join the outer door panel 11 and the inner door panel 12. It is fixed between them and both ends are supported.

In this case, the circular tubular portion 23 of the beam portion 21 is arranged so as to be vertically in the door space 13. As mentioned above, even in the small internal space 13,
Since there is a relatively large space in the vertical direction,
By arranging the circular tubular portions 23 in the vertical direction, the strength and rigidity are significantly increased as compared with those formed by a single pipe, and even a relatively wide automobile door guard bar 20 can be reliably stored in the internal space. can do.

When an automobile having the automobile door guard bar 20 undergoes a side collision, the impact is transmitted to the occupants by the door panels 11 and 12 of the automobile exhibiting a cushioning function to counter the impact. Prevent the situation
An impact that cannot be resisted by the door panels 11 and 12 is mainly buffered by the door guard bar 20.

When an impact is transmitted to the door guard bar 20, the deformation mode of the door guard bar 20 is as follows.
First, as shown by the broken line in FIG. 5, the inner end 23a of the circular tubular portion 23 that has been impacted slides on the upper surface 24a of the intermediate coupling portion 24, causing initial deformation.

Next, the circular tubular portion 23 is crushed, and the intermediate connecting portion 24 extending in the groove shape is deformed, so that the entire door guard bar 20 is deformed. That is, the door guard bar 20 of the first embodiment
Becomes a gradual deformation mode in which the structure is positively subjected to initial deformation and then to overall deformation, and the absorption capacity for various impacts can be adjusted.

(Embodiment 2) In the present invention, it is also possible to locally enhance the impact absorbing capacity as in Embodiment 2 below. 9 is a perspective view of an automobile door guard bar according to Embodiment 2 of the present invention, and FIG.
It is sectional drawing which follows the 0-10 line.

In the vehicle door guard bar 20a according to the second embodiment, the circular tubular portion 23 is formed over the entire length in the longitudinal direction of the beam portion 21, and the reinforcing member 30 is contacted with the outside of the central portion of the circular tubular portion 23. Is attached.

The door guard bar 20a also includes the beam portion 2
Between the circular tubular portions 23, 23, there is an intermediate connecting portion 24 integrally formed with the circular tubular portion 23. In particular, in the case where the reinforcing member 30 is attached to the circular tubular portion 23 as in the second embodiment, if the intermediate connecting portion 24 is provided, the reinforcing member 30 is pressed to form the circular tubular portion 2.
The work of attaching to 3 becomes extremely easy.

That is, the door guard bar 20a is installed as shown in FIG.
After molding in the order of steps shown in to e, a plate for forming the reinforcing member 30 is attached to the door guard bar 20a so as to circumscribe, and the door guard bar 20a is installed between the upper and lower press molds, and similarly press-molded. To do.

In this case, the intermediate connecting portions 24 and 24a, which are formed by overlapping the beam portion 21 and the reinforcing member 30, are pressed by the uneven portions formed in the upper and lower press dies to form the embossed portion 31, so that the intermediate connecting portions are formed. 24 and 24a can be supported from both the upper and lower sides, the embossed portion 31 can be easily formed, and the door guard bar 20a to which the reinforcing member 30 is fixed can be easily formed outside the circular tubular portion 23.

As a result, it is possible to form the guard bar 20a having the beam portion 21 to which the reinforcing member 30 is fixedly attached to the outside of the circular tubular portion 23 without performing a welding operation, so that welding distortion occurs in the finished product. And a guard bar with good precision and molding workability can be obtained. Further, the guard bar 20a having the beam portion 21 to which the reinforcing member 30 is fixed can locally increase the shock absorbing capacity as compared with the guard bar 20 described above by the amount that the reinforcing member 30 is fixed.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the claims.

For example, in the automobile door guard bar 20 described above, as shown in FIG. 5, the inner ends 23a of the two circular tubular portions 23 of the beam portion 21 are the upper surfaces 24a of the intermediate connecting portions 24.
Although it is formed so as to abut against, it may be configured as in each of the embodiments shown in FIG.

In the embodiment shown in FIG. 11a, a flange portion 23b is provided at the inner end 23a of the circular tubular portion 23, and the flange portion 23a abuts the upper surface 24a of the intermediate connecting portion 24. In the embodiment shown in FIG. 11b, the intermediate connecting portion 24 is not provided, and the inner ends 23a of the circular tubular portions 23 are in contact with each other.

In the embodiment shown in FIGS. 11a and 11b, the above-mentioned initial deformation amount can be set to zero.

In the embodiment shown in FIG. 11c, the inner end 23a of the circular tubular portion 23 is curled so as to abut against the side portion 24b of the intermediate connecting portion 24.
And a small gap s between the upper surface 24a of the intermediate connecting portion 24 and
Is to occur. In the first and second embodiments,
At the time of the initial deformation, the inner end 23a of the circular tubular portion 23 moves along the upper surface 24a of the intermediate connecting portion 24. However, in the present embodiment, the inner end 23a of the circular tubular portion 23 is the side portion of the intermediate connecting portion 24. The initial deformation is performed by moving along with, and it has a function of absorbing the smaller impact.

In the embodiment shown in FIG. 11d, the intermediate connecting portion 24 and the circular tubular portion 23 are made flat, and this embodiment also has an inner end 23a of the circular tubular portion 23 at the time of initial deformation. Is performed by moving along the upper surface 24a of the intermediate connecting portion 24.

In the embodiment shown in FIG. 11e, the circular tubular portion 23 abuts the side portion 24b of the intermediate connecting portion 24, and the inner end 23a thereof has the intermediate connecting portion 24 and the circular tubular portion 23.
It is arranged so as to come into contact with the corner portion 25 of. In the present embodiment, the resistance against initial deformation is considerably large.

In the above embodiment, the reinforcing member 30 is used.
Is provided in contact with the outside of the circular tubular portion 23, but the reinforcing member 30 may be provided in contact with the inside of the circular tubular portion 23. In this case as well, as in the case of the external contact, two plate materials may be stacked and molded using a pressing device.

Further, although the embossed portion 31 is formed by pressing the intermediate connecting portion 24, the embossed portion 31 can be easily formed when the circular tubular portion 23 is short, so that the reinforcing member is formed. The reinforcing member 30 and the beam portion 21 may be fixed to each other by being formed at the end portion of 30.

In the above embodiment, the two circular tubular portions 23 are formed in the beam portion 21, but the present invention is not limited to this, and a plurality of three or four or more. It goes without saying that the circular tubular portion 23 of FIG.

[0044]

As described above, according to the first aspect of the invention, if at least two circular tubular portions are formed in the entire length or a part of the beam portion, the beam portion having a single pipe-like strength characteristic is provided. It will be significantly improved, and the desired strength can be maintained even if a lower strength material, that is, an inexpensive material is used, which makes it possible to manufacture the guard bar at a low cost and press molding, so that it can be used for automobiles. The overall weight of the door guard bar can be reduced. Further, by disposing the circular tubular portions vertically in the door space, the guard bar can be stored without lowering the strength characteristics of the beam portion. According to the second aspect of the present invention, since the circular tubular portion is formed to have a predetermined length in the central portion in the longitudinal direction, the strength characteristic of the central portion in the longitudinal direction of the beam portion, which requires the most strength, is improved. The invention according to claim 3 is
The intermediate connecting portion spreads the beam portion having the highest strength in the vertical direction, so that a safer one can be obtained, and moreover, the press formability is improved. According to the invention described in claim 4, when the door guard bar is supported at both ends, the center part has a desired strength and can be molded so that the strength changes as it approaches the ends. In addition to being excellent, no excessive material is generated in the vicinity of the end portion, and in some cases, the strength characteristic in the longitudinal direction of the beam portion can be changed depending on the location. In the invention according to claim 5, the strength and the like of the central portion of the door guard bar are further enhanced by the reinforcing member. In the invention according to claim 6, the reinforcing member and the beam portion can be connected without welding, and the door guard bar is excellent in accuracy and has good molding workability.

[Brief description of drawings]

FIG. 1 is a schematic front view of a vehicle door.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

3 is a cross-sectional view taken along line 3-3 of FIG. 1, FIG. 3a shows an example in which the end bracket is formed straight, and FIG. 3a shows an example in which one of the end brackets is bent. FIG.

FIG. 4 is a perspective view of the first embodiment of the present invention.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is a side view of FIG.

7 is a cross-sectional view taken along line 7-7 of FIG.

FIG. 8 is a main-portion cross-sectional view showing the molding state of the first embodiment in steps.

FIG. 9 is a perspective view of a second embodiment of the present invention.

10 is a sectional view taken along the line 10-10 of FIG.

FIG. 11 is a sectional view showing another embodiment of the present invention.

FIG. 12 is a view showing a conventional door guard bar.

FIG. 13 is a view showing another conventional door guard bar.

FIG. 14 is a view showing still another conventional door guard bar.

[Explanation of symbols]

10 ... Automotive door, 11, 12 ... Door panel, 13 ... Door space, 20 ... Automotive door guard bar, 21 ... Beam part, 22 ... End bracket, 23 ... Circular tubular part, 24 ... Intermediate connecting part, 30 ... Reinforcement Member, 31 ... Embossed portion, t ... Beam portion thickness.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 12, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

FIG. 4

[Figure 5]

FIG. 6

FIG. 7

[Figure 8]

[Figure 9]

[Figure 10]

FIG. 11

FIG.

FIG. 13

FIG. 14

Claims (6)

[Claims] 1. A door panel (11, 12) for an automobile door (10).
End brackets (22, 22) which are provided in the door space (13) formed by the above so as to extend in the front-rear direction and are connected to the door panels (11, 12), and the end brackets (22, 22). In a door guard bar (20) for an automobile, which is formed by press-forming one plate with the beam part (21) provided between the two parts, the entire length or part of the beam part (21) is elongated. Forming at least two circular tubular portions (23, 23) extending along the axis, and mounting the circular tubular portions (23, 23) so as to be located vertically in the door space (13). A characteristic door guard bar for automobiles. 2. The beam portion (21) comprises the circular tubular portion (2).
The vehicle door guard bar according to claim 1, characterized in that a predetermined length (3,23) is formed at a central portion in the longitudinal direction. 3. The beam portion (21) comprises the circular tubular portion (2).
3,23) The vehicle door guard bar according to claim 1 or 2, wherein the intermediate connecting portions (24) are integrally connected to each other. 4. The beam portion (21) comprises the circular tubular portion (2).
3,23) longitudinal end to the end bracket (22,22)
The vehicle door guard bar according to any one of claims 1 to 3, characterized in that the thickness (t) of the beam portion (21) is gradually reduced in the portion extending toward the side. 5. The beam portion (21) comprises the circular tubular portion (2).
Reinforcement member (30) so as to contact the inside or outside of
The door guard bar for an automobile according to any one of claims 1 to 4, further comprising: 6. The reinforcing member (30) includes the intermediate connecting portion (2).
The vehicle door guard bar according to claim 5, wherein the beam portion (21) is fixed by an embossed portion (31) formed by pressurizing (4).