JPH0632137U - Car door guard bar - Google Patents

Abstract

(57) [Abstract] [Purpose] This is a door guard bar that is composed of a pipe and an assembly bracket and is installed inside the door. It is possible to prevent the bracket from being deformed or damaged due to external stress. The purpose is to provide a door guard bar. [Structure] The cut ends of both ends 1a, 1b of the pipe 1 are cut with a predetermined angle inclined from a direction perpendicular to the axial direction of the pipe 1, and the inclination angle of the cut processed portion is set to an assembling bracket 3 The vehicle door guard bar is characterized in that the angle of inclination of the sloped portion 3a formed in the above is matched.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a door guard bar mounted inside a vehicle door to improve the rigidity of the door.

[0002]

[Prior art]

 For the door guard bar described above, the structure shown in, for example, FIG. 4 has been generally used. That is, in the structure of the door guard bar 10 shown as a whole, 1 is a steel pipe, and one end of the pipe 1 in the longitudinal direction is integrally attached to a front bracket 2 for mounting on an automobile door by a welding portion 5. The rear bracket 3 is integrally fixed to the other end by a welding portion 7.

The steel pipe 1 is usually made of high-tensile steel having a diameter of about 20 to 50 and a tensile strength of about 100 to 170 (kgf / mm ² ). , 3 are steel plates having a tensile strength of about 40 to 80 (kgf / mm ² ).

Therefore, by setting the sectional modulus and the sectional secondary moment of the pipe 1 constituting the door guard bar 10 to appropriate values, the assembly brackets 2 and 3 of the door guard bar 10 can be installed inside the automobile door. When welded or bolted to the door, it gives the door adequate rigidity.

[0005]

[Problems to be solved by the device]

 However, in the case of such a conventional door guard bar 10, since the section modulus of both ends of the pipe 1 made of high-strength steel material changes abruptly, the stress applied from the outside causes both brackets 2 and 3 to cross. There was a problem that deformation and damage were likely to occur.

That is, although the cross-sectional shape of the pipe 1 is constant along the longitudinal direction and the rigidity is uniform, as shown in FIG. 5, which is a cross-sectional view taken along the line BB of FIG. Since the cut end at the end portion 1b of the pipe 1 is perpendicular to the axial direction of the pipe 1, the sectional modulus and the second moment of inertia of the pipe 1 change abruptly at both end portions, resulting in a collision or the like. When external stress is applied to the door guard bar 10 due to the above, the stress is directly exerted on both brackets 2 and 3, and it is avoided that both brackets 2 and 3 are excessively deformed or damaged. I can't.

Therefore, the present invention solves the problem of such a conventional automobile door guard bar, and allows the pipe and the bracket to flexibly respond to external stress, and to prevent the excess of both brackets. It is an object of the present invention to provide a door guard bar capable of preventing deformation and damage of the door.

[0008]

[Means for Solving the Problems]

 According to the present invention, in order to achieve the above object, a front bracket for assembling to a vehicle door is integrally fixed to one longitudinal end of a steel pipe, and the rear bracket is attached to the other end of the pipe. In an automobile door guard bar to which is integrally fixed, the cut ends at both end portions of the pipe are cut with a predetermined angle inclining from the direction perpendicular to the axial direction of the pipe. The vehicle door guard bar has a structure that matches the inclination angle of the slope formed on the mounting bracket.

[0009]

[Action]

 With such a door guard bar structure, the section modulus and the second moment of area at both ends of the pipe change smoothly, so that when external stress is applied to the door guard bar due to a collision or the like, And both brackets can be flexibly deformed to receive this stress. Therefore, external stress is not directly applied to both brackets, excessive deformation and damage of both brackets are prevented, and the absorption rate of load energy such as collision required by the door guard bar is increased.

[0010]

【Example】

 A specific embodiment of a vehicle door guard bar according to the present invention will be described in detail below with reference to the accompanying drawings, in which the same reference numerals are given to the same components as the conventional components.

FIG. 1 is a perspective view showing a basic embodiment of the present invention, and FIG. 2 is a sectional view of a portion along line AA of FIG. In the structure of the door guard bar 20 generally shown in the figure, 1 is a steel pipe, and the cross-sectional shape of the pipe 1 is constant along the longitudinal direction and the rigidity is uniform, The cuts in the end portions 1a, 1b of the pipe 1 are cut and processed in a state in which they are inclined by a predetermined angle from the direction perpendicular to the axial direction of the pipe 1. A portion near the terminal portion 1a is integrally fixed to the front bracket 2 for assembling to the automobile door by the welding portion 5, and a portion near the terminal portion 1b is integrally fixed to the rear bracket 3 by the welding portion 7. ing.

As shown in the cross-sectional view of FIG. 2, the inclination angle of the cut-processed portion of the end portion 1b matches the inclination angle of the inclined surface portion 3a of the rear bracket 3, and therefore, the end portion 1b of the pipe 1. The rear bracket 3 is firmly fixed so as to be in close contact with the rear bracket 3. The contact portion between the front bracket 2 and the pipe 1 is substantially the same.

According to the configuration of the present embodiment, since the section modulus and the second moment of area at both ends 1a and 1b of the pipe 1 change smoothly, external stress caused by collision or the like is generated in the door guard bar 20. Even when it is applied to the pipe, the pipe 1 and the two brackets 2 and 3 can be flexibly deformed to receive this stress. Therefore, the force is not exerted directly on both brackets 2 and 3, and it is possible to prevent excessive deformation and damage of both brackets 2 and 3. In other words, the absorption rate of the load energy such as a collision is increased in the displacement amount specified as one of the performance factors required by the door guard bar.

FIG. 3 is a cross-sectional view showing a modified example of the present invention. In the case of this example, the cut end in the end portion 1b of the pipe 1 is in a direction perpendicular to the axial direction of the pipe 1 as in the example of FIG. The rear bracket 3 is integrally fixed to the end portion 1b, and the bent portion 3b is formed in the middle portion of the rear bracket 3. By forming such a bent portion 3b, it is possible to prevent another object 9 arranged in the vehicle door from interfering with the rear bracket 3, which is also advantageous in terms of layout.

[0015]

[Effect of device]

 As described in detail above, according to the door guard bar for an automobile of the present invention, the cut ends at both ends of the pipe are cut and inclined at a predetermined angle from the direction perpendicular to the axial direction of the pipe. Since the angle of inclination of the part matches the angle of inclination of the slope formed on the bracket for door assembly, it becomes possible to smoothly change the section modulus and the second moment of area at the end parts of the pipe, resulting in collisions, etc. Even if an external stress due to is applied to the door guard bar, the pipe and both brackets can be flexibly deformed to receive this stress.

Therefore, since no external stress is directly applied to both brackets, both brackets can be prevented from being excessively deformed or damaged, and the absorption rate of load energy such as collision can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing a basic embodiment of the present invention.

FIG. 2 is a sectional view of a portion taken along the line AA of FIG.

FIG. 3 is a sectional view showing a modified example of the present invention.

FIG. 4 is a perspective view showing an example of a conventional door guard bar.

5 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pipe, 1a, 1b ... Terminal part, 2 ... Front bracket, 3 ... Rear bracket, 3a ... Slope part, 3b ... Bending process part, 5, 7 ... Welding part, 9 ... Other objects, 20 ... Door guard bar.

Claims (1)

[Scope of utility model registration request] 1. An automobile in which a front bracket for assembling to an automobile door is integrally fixed to one longitudinal end of a steel pipe, and the rear bracket is integrally fixed to the other end of the pipe. In the door guard bar for use in cutting, the cut ends at both end portions of the pipe are cut with a predetermined angle inclined from the direction perpendicular to the axial direction of the pipe, and the inclination angle of the cut portion is formed on the assembly bracket. A car door guard bar characterized by matching the inclination angle of the slope.