JPH0642345U - Car door guard bar - Google Patents

Abstract

(57) [Summary] [Purpose] A guard bar for an automobile door that requires a small number of parts, does not require a welding process for mounting, and can have a cross-sectional shape that reasonably functions against a collision load. I will provide a. In a guard bar for an automobile door, which is provided along a width direction of a door and whose both ends are fixed to a peripheral portion of the door to suppress deformation of the door, a base body (11) of a guard bar of an automobile is a continuous extruded aluminum material. A door guard bar cut out from (10) and integrally molded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automobile door guard bar, and more particularly to a reinforcing guard bar provided between an outer plate and an inner plate of a door as a safety measure to prevent the door from being largely deformed in a collision. .

[0002]

[Prior art]

As a conventional automobile door guard bar, for example, one shown in FIG. 4 is known. Here, 1 is the guard bar, 2 is a steel pipe that is the base of the guard bar 1, and 3 is a steel plate mounting plate that is welded to both ends of the steel pipe 2 by electric arc welding 4. The steel pipe 2 is made of high tensile strength steel having a tensile strength of 100 to 180 kgf / mm ² . Since the mounting plates 3 of the guard bar 1 are mounted on the door inner plate 7 by spot welding 6, 8 is an outer plate of the door.

[0003]

[Problems to be solved by the device]

 However, such a conventional automobile door guard bar 1 has a structure in which the mounting plates 3 are arc-welded to both ends of a steel pipe 2 made of high-strength steel, which is particularly strong and has high tensile strength. Therefore, a high level of welding technology is required, and since it is a component for collision prevention, poor welding is not allowed.

Further, since the number of parts is three, each mold and assembly jig are required, and production management including storage of parts, molds and jigs is not easy. Further, when the guard bar 1 is considered as a beam, the geometrical moment of inertia I and the geometrical coefficient Z are greatly different between the steel pipe 2 and the mounting plate 3 at the weld 4 portion. That is, since the mounting plate 3 has a smaller value such as 1 in several minutes than the steel pipe 2, the mounting plate 3 is more likely to be deformed. Therefore, it is desired to increase the plate thickness or size of the mounting plate 3, but such measures lead to an increase in cost as well as an increase in weight.

Furthermore, although the guard bar 1 is required to have strength against the collision direction, the round steel pipe has the same cross-section as the cross-section has a center-symmetrical shape. This is a condition and is not set as the optimum cross-sectional shape.

The object of the present invention is to focus on the above-mentioned conventional problems and to solve them, eliminate the difficult welding process with a small number of parts and have a cross-sectional shape that reasonably functions against a collision load. It is to provide a guard bar for an automobile door having the following.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention has a base provided along the width direction of a door, and by fixing both ends of the base to the peripheral portion of the door, the deformation of the door is suppressed. In the guard bar for an automobile door as described above, the base body is cut out from a continuous extrusion mold of aluminum and integrally molded.

[0008]

[Action]

 According to the present invention, since it is cut out from an extruded aluminum material and integrally molded, the cross-sectional shape of the central portion can be appropriately set so as to have optimum I and Z with respect to the collision direction, and at the same time, from the central portion. It is possible to form the beam shape to both ends so that there is no sudden change in I or Z, and it is possible to cut the extrusion mold material without waste, thus improving the yield. Accordingly, it is possible to provide a guard bar for automobile doors that is suitable for mass production as well as cost reduction.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which 11 is a base body of an aluminum guard bar according to the present invention, which easily fits in the space inside the door and the direction of collision, in the case of this example, the door. 2 is molded integrally by the process shown in FIG. 2 so as to obtain appropriate and sufficient second moments of inertia I and Z (section modulus) for the impact force from the side surface direction. That is, first, as shown in FIG. 2A, a bar-shaped extruded material 10 having a preset cross section is molded from aluminum, and then cut into the shapes shown in the next and (B). Here, 11A serves as the mounting plate portion on the side to be mounted on the door side in the final step. After that, both ends of the mounting plate portion are deformed in the arrow direction by press work, and as shown in (C). The guard bar 11 was formed in the shape. Then, in the vicinity of both ends of the guard bar 11 formed in this way, screw holes 21 for attaching a door were drilled as shown in FIG.

In this example, the tensile strength is 30 to 50 kg / mm ² , the elongation is 10% or more, and the guard bar 11 is made of an aluminum material. The sectional shape was set so as to be maintained within the range of 7. Here, as the cross-sectional shape in which both I and Z increase, the shape shown in FIG. 1B (shown as in FIG. 3) is preferable, but the shape shown in FIG. The relationship between the load and the displacement in the collision direction is almost unchanged as shown by C ₁ and C ₂ . Therefore, considering the production cost, it is not necessary to be limited to the sectional shape as shown in FIG. 1 (B), and the point is that the Z / L is set within the range of about 5-7. Good. Further, in this embodiment, as shown in FIG. 2, the shape shown in FIG. 2 (C) was processed, but in the space between the inner plate 7 and the outer plate 8 of the door, FIG. It may be any as long as it can be accommodated as a guard bar in the form as it is before press working as shown in.

[0012]

[Effect of device]

 As described above, according to the present invention, it is possible to suppress the deformation of the door by having the base body provided along the width direction of the door and fixing both ends of the base body to the peripheral portion of the door. In the above-mentioned automobile door guard bar, the base body was cut out from a continuous aluminum extrusion mold and integrally molded, so there is no need for the difficult welding that requires reliability when installing the guard bar as in the past. In addition to being able to improve productivity, it is possible to set the cross section and beam shape in consideration of collision resistance, and in particular, it is possible to make a structure that fully utilizes the lightness and other characteristics of aluminum. it can. Further, since it can be cut out from an extrusion-molded material and processed, it is possible to provide a guard bar for an automobile door that has a good yield and is suitable for mass production.

[Brief description of drawings]

FIG. 1 is a perspective view (A), a central cross-sectional view (B), and a cross-sectional view (C) showing the structure of the present invention assembled into a door.
It is an explanatory view shown by.

[Fig. 2] Process of processing the guard bar according to the present invention (A)
It is explanatory drawing shown by- (C).

FIG. 3 is a characteristic curve diagram showing the relationship between the load in the collision direction and the amount of displacement of the guard bar according to the present invention.

FIG. 4 is a cross-sectional view showing a configuration of a conventional example.

[Explanation of symbols]

 7 Inner plate (of door) 8 Outer plate of door 10 Extruded material 11 (Bar) Guard bar 11A Mounting plate 21 Screw hole

Claims (1)

[Scope of utility model registration request] 1. A guard bar for an automobile door, comprising a base body provided along a width direction of a door, and fixing both ends of the base body to a peripheral portion of the door to suppress deformation of the door. A guard bar for an automobile door, characterized in that the base is cut out from a continuous extrusion mold of aluminum and integrally molded.