KR20110008760A - Structure of center pillar - Google Patents

Abstract

PURPOSE: A center pillar structure is provided to reduce the thickness of the pillar structure compared with an existing pillar structure and to easily attach a reinforcing member on an external member. CONSTITUTION: A center pillar structure(100) comprises an external member(10) and an internal member(20). A convex surface(11) is formed in the external member. A concave surface(21) is formed in the internal member. The external and internal members are arranged to form an inner space between the convex and concave surfaces. A reinforcing member(30) is formed in the inner space and is in contact with the convex and concave surfaces.

Description

Center Filler Structure {STRUCTURE OF CENTER PILLAR}

The present invention relates to a center pillar structure of a vehicle, and more particularly, a center pillar structure in which an inner space is formed in a predetermined size in a center pillar formed of an outer member and an inner member, and the rigidity is increased by bonding a reinforcing material to the inner space. It is about.

The roof, which is a ceiling part of the vehicle, is supported by the pillars to form an interior space of the vehicle where passengers can ride, and forms an upper side of the vehicle.

In the case of SUV or RV vehicles, the filler connected to the roof is usually divided into an A pillar, a B pillar, and a C pillar, depending on the position of the D pillar.

Among them, the center pillar (B pillar), which is located between the first and second row doors and is located between the first and second row doors and is located at the center of the vehicle, is a member that substantially supports the force generated from the roof. The center pillar, which is not exposed to the outside of the vehicle because the A-pillar and C-pillar exposed to the design are considered structural aspects for rigidity along with the design aspect, the center pillar that is not exposed to the outside of the vehicle is designed to reflect many structural aspects for rigidity in the vehicle design. do.

In addition, recently developed SUV or RV vehicles have a relatively high vehicle body, which increases the risk of overturning accidents. Therefore, the vehicle has a higher bearing capacity to minimize passenger injuries due to collapse of the loop when the vehicle rolls over. Center pillar structures are being developed.

Meanwhile, safety standards for vehicles are provided for each manufacturer as well as for each country, and the vehicle is designed and manufactured according to the safety standards.

As such, the ceiling structure for reducing passenger injuries when the vehicle is overturned, among other criteria for securing the safety of the vehicle, is regulated in Korea to meet Article 92 of the Regulation on Automobile Safety Standards, and in the United States, the safety of FMVSS 216. Regulated by law.

The other requirements in Article 92 of the National Regulations on Automobile Safety Standards are different from those of the US 'FMVSS 216' Safety Regulations. This is similar.

In the ROOF CRUSH RESISTANCE TEST according to the national regulations, when the load is applied at a speed of less than 12.7mm per second within 120 seconds until the load value reaches 1.5 times the vehicle weight or the smaller of 2,270kg. The displacement of the ceiling is required to be 127 mm or less.

As such, in order to satisfy legal safety regulations and increase vehicle stability, the present applicant has applied for a 'center pillar structure connecting a vehicle body and a loop' (Patent Application No. 10-2007-0118623, filed Nov. 20, 2007). It has been developed and applied for a patent.

As shown in Figures 1a, 1b and 1c, the patent forms a space between the outer member 110 and the inner member 120 to increase the stiffness of the center pillar, the cross section is formed in the "W" ruler The bar-shaped reinforcement 130 is inserted. Accordingly, the effect of improving the strength was obtained in comparison with the center pillar structure without the reinforcement, but the "W" shaped reinforcement 130 is bonded and fixed between the outer member 110 and the inner member 20 on both sides. Since the structure, as shown in FIG. 1C, the thickness at both ends of the center pillar to which the weather strip 140 is coupled is increased.

Accordingly, inconvenience occurred in the installation of the weather strip 140 to prevent noise and leakage and to maintain the airtightness between the door and the body, and only the reinforcement having a thickness capable of spot welding should be used. There was a problem of narrowing the flexibility in design and design.

The present invention has a structural rigidity that can satisfy both the domestic and international regulations as described above, and to provide a center pillar structure that can be manufactured and produced in a thinner state to ensure the flexibility of the design of the exterior design and the body design There is a main purpose.

The present invention for achieving the above object, in the center pillar structure of the vehicle, the filler, the outer member is convex stepped along the longitudinal direction formed protruding surface; and stepped concave along the longitudinal direction An inner member having a settling surface formed therebetween so as to form an inner space between the protruding surface and the settling surface, and having a hollow inside thereof in surface contact with at least one of the protruding surface and the settling surface. A pipe-shaped reinforcement is characterized in that it is configured to be bonded in the inner space.

The reinforcing member has a square pipe shape having a polygonal cross section, and an inclined surface is formed so as to be able to contact the edge portion stepped in the inner space of the filler.

The reinforcing material is bonded to the outer member by welding, it is preferable that the inner member is bonded by bolting (bolting).

The protruding surface is composed of a welding surface that is formed flat so that the reinforcing material is in surface contact and a convex surface that is convexly formed to form a rib on one side of the welding surface so as to be spaced apart from the reinforcing material.

In the present invention having the same configuration as described above, the tubular reinforcement 30 having a polygonal cross section inside the filler 100 made of the outer member 10 and the inner member 20 is bonded by welding, and the conventional "W" Compared with the filler structure composed of the reinforcing material 130, there is an effect that the structural thickness can be made thin. In addition, when adopting the reinforcement of the same weight has the effect of obtaining a greater bearing capacity.

In addition, the reinforcement has a polygonal shape in which the inclined surface is formed in contact with the protruding surface can be easily bonded to the outer member by CO ₂ welding.

Hereinafter, a center pillar structure of a vehicle according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2a is a perspective view showing a perspective view of the center pillar inserted the reinforcement of the present invention, Figure 2b is a perspective view of the reinforcement, Figure 2c is a cross-sectional view of A-A of FIG.

The center pillar 100 of the present invention includes an outer member 10 that is exposed to the outside when the door is opened to contact the door and an inner member 20 that is in surface contact with the outer member 10 inside the vehicle. As shown, the center pillar 100 is a vertically upright structure to support the loop, and has an internal space in which the reinforcement 30 is accommodated. Therefore, based on the line of sight (a line of sight viewed from the outside of the vehicle) shown in FIG. 2A, the outer member 10 is convexly stepped to protrude so that the inner space α can be formed. ) Is formed along the longitudinal direction of the filler, and the inner member 20 is concavely stepped so that the settling surface 21 entering the inner side is formed along the longitudinal direction of the filler. As shown in FIG. 2C. The outer member 10 and the inner member 20 is formed with a flat surface to be abutted and joined on both sides of the protruding surface 11 and the settling surface 21, respectively, the outer member 10 and the inner member ( 20 has a protruding surface 11 and the settling surface 21 are opposed to have an internal space α that the reinforcing material 30 can accommodate, and may have various thicknesses according to the design of the vehicle.

The inner member 20 according to the present invention has a settled surface 21 to facilitate riveting or bolting (bolting) and the received reinforcement 30, while the protruding surface 11 of the outer member is In order to further increase the rigidity of the pillar structure, a convex surface protruding the ribs 12 along the longitudinal direction is additionally formed. As shown in FIG. 2C, the convex surface is preferably formed at one side or both sides of the weld surface formed to be in contact with the reinforcing material 30. In addition, the protruding surface 11 and the settling surface 21 according to the preferred embodiment of the present invention have different widths as shown in FIG. 2C in order to suppress an increase in the filler width as much as possible or according to the design of the vehicle. It is configured to have.

On the other hand, the reinforcing material 30 of the present invention is made of a pipe (pipe) shape of the inside (cavity), as shown in Figure 2b, the inner member 20 and the inner member 10 is formed The cross-sectional area is increased downward depending on the shape of the subspace α and the shape of the filler. In addition, the inclined surface 31 is formed along the longitudinal direction so that the reinforcing material 30 which is abutted at the corner of the step where the outer member 10 is stepped can be joined by CO ₂ welding, It is formed with a flat surface to enable spot welding. Therefore, the reinforcing material 30 preferably has a square tube shape having a polygonal cross section so as to be easily bonded to the outer member 10 by welding and to be bonded by the surface contact with the inner member 20. Meanwhile, as shown in FIG. 2B, the reinforcing material 30 may have entry holes 32 formed at regular intervals to facilitate the entry and exit of the welding gun.

3 is a view showing experimental data showing the difference in the stiffness of the filler according to the shape of the reinforcing material inserted in the filler consisting of the same outer member 10 and the inner member 20.

Each reinforcement was made of the same material and weighed 1750 g, and the joints (parts indicated by "·") were joined by spot welding. To have the same weight, the single "W" shaped reinforcement shown at the left is 2.3 mm thick, and the double "W" shaped reinforcement bonded at the two overlapping centers shown is 1.4 mm and 1.6 mm thick, respectively. Reinforcing material according to a preferred embodiment of the present invention shown on the right was tested to a thickness of 2.3 mm.

In the graph below, the x-axis represents the displacement of the ceiling in the 'ceiling strength test' according to the rules of the automobile safety standard in Korea, and the unit is mm, and the y-axis represents the repulsive force per unit displacement, that is, the load that can be supported. kg / mm.

As mentioned above, the rule on automotive safety standards states that in Article 92, "... the ceiling should have a displacement of 127 millimeters or less when the load is applied until it reaches 1.5 times the vehicle weight or the smaller of 2,270 kg." It is described. Therefore, the higher the value of the y-axis in the graph of Figure 3 can be interpreted as a higher rigidity, it is more advantageous in the flexibility of the vehicle design to have a maximum repulsive force near 120 mm in the x-axis of the graph.

Fillers with conventional "W" shaped reinforcements composed of single and double are 28% and 27% higher repulsive forces than fillers without reinforcement, respectively, whereas the reinforcement according to the present invention has a change in shape without change in weight and material. Only the maximum repulsion was improved by 30% compared to the filler without reinforcement. In addition, the conventional "W" shaped reinforcement is fixed on both sides between the outer member and the inner member to increase the thickness of the filler, the reinforcement structure of the present invention is to adjust the inclination angle of the inclined surface and the diameter and bending rate of the convex surface It will be considered to provide stiffness to meet safety regulations without increasing filler thickness and to provide greater freedom of vehicle design.

As described above, the embodiments disclosed in the specification and the drawings are only presented as specific examples to aid the understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

Figure 1a is a partial perspective view showing a center pillar inserted with a conventional reinforcement,

1B is a cross-sectional view of A-A of FIG. 1A,

1C is a cross-sectional view illustrating a weather strip fastened to one side of the center pillar of FIG. 1B;

Figure 2a is a partial perspective view showing a center pillar equipped with a reinforcement according to a preferred embodiment of the present invention,

2b is a perspective view of a reinforcing material according to a preferred embodiment of the present invention,

FIG. 2C is a cross-sectional view of A-A of FIG. 2A

Figure 3 is a view showing an experimental graph of the fillers each equipped with a conventional reinforcing material and the reinforcing material of the present invention.

** Description of the symbols for the main parts of the drawings **

10: outer member 20: inner member

30: reinforcement

Claims (4)

In the center pillar structure of the vehicle, The filler, An outer member which is convexly stepped along the longitudinal direction to form a protruding surface; and an inner member which is concavely stepped along the longitudinal direction to form a settling surface; so as to form an inner space between the protruding surface and the settling surface Deployed, The center pillar structure, characterized in that the reinforcement of the pipe shape (hollow) inside the hollow surface in contact with any one or more of the protruding surface and the settled surface are bonded to the inner space. The center pillar structure according to claim 1, wherein the reinforcing member has a square pipe shape having a polygonal cross section, and an inclined surface is formed to be joined to abutted corner portions in the interior space of the filler. 3. The center pillar structure of claim 2, wherein the reinforcing material is welded to the outer member and bolted to the inner member. The welding surface according to any one of claims 1 to 3, wherein the protruding surface is formed of a welding surface that is flat so that the reinforcing material is in surface contact, and a convex surface that is convexly formed to form a rib on one side of the welding surface so as to be spaced apart from the reinforcing material. Center pillar structure, characterized in that.

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