KR20110049212A - Wheel for vehicle - Google Patents

Abstract

PURPOSE: A wheel for a vehicle is provided to optimize an endurance design by differently controlling the thickness of the parts of the wheel depending on stress distribution. CONSTITUTION: A wheel(100) for a vehicle comprises a rim(150) and a disk(120). The rim is formed in a cylindrical shape so that a tire can be installed on the outer surface of the rim. The disk is welded in the inner side of the rim to prevent the rim from being deformed. A hub hole(132) is formed in the center of the disk. The disk has first and second areas(130,140). A bolt hole is formed in the first area. The second area is extended from the first area and is formed in a cylindrical shape.

Description

Automotive wheel {WHEEL FOR VEHICLE}

The present invention relates to a wheel for an automobile, and more particularly, to a wheel for an automobile in which a tire is mounted and rotates at a high speed during driving of the vehicle.

In general, the wheel for the automobile is one of the vehicle parts that is to be mounted on the hub (Hub) by combining the tire to keep the tire in a constant state. In addition, the wheel for the vehicle is composed of a rim (Rim) for maintaining the combined tire and the disc (Disc) formed with a bolt hole for preventing the deformation of the rim and the like coupled to the hub.

In other words, the wheels for automobiles are chasing parts consisting of discs and rims. In addition, since the wheel for an automobile is a component that receives a primary impact load from the road surface while rotating at high speed, it is designed in consideration of the oral cavity degree.

The materials used for automobile wheels so far are largely divided into aluminum alloy and steel. Aluminum alloys are widely used in aircraft materials because they are lighter, stronger in corrosion resistance, and have higher specific strength (mass-to-mass) than steel.

However, aluminum alloy has a disadvantage that it is difficult to be widely used as a wheel for automobile because of the high price.

In the case of steel, it has been widely used in terms of cost in the related art, but in recent years, the rate of use has gradually decreased as vehicle fuel economy (light weight) and design become important criteria for selecting a vehicle.

However, high-strength steel for lighter weight and improved workability of steel have been developed to enable sophisticated shape machining, and steel usage is gradually increased.

On the other hand, automotive wheels are generally manufactured by processing disks and rims, and then joining them using arc welding, or by using molten metal such as casting or die casting in a mold mainly used in aluminum alloys. Is produced.

In addition, the wheel for a conventional vehicle was designed by changing the shape and thickness to satisfy the structure / durability (stress relief). However, when the stress imposed on the wheels for automobiles is only considered in consideration of the thickness, the weight is increased, so that the weight is rather disadvantageous, and in recent years when fuel economy is important, there are many problems in designing only the thickness.

An object of the present invention is to provide a wheel for an automobile that can reduce the weight increase compared to the stress even if the thickness is increased to relieve stress.

Accordingly, an object of the present invention is to provide a wheel for an automobile that can provide an optimum durability design by controlling the thickness of each part differently from each other according to the distribution of stress.

An automobile wheel according to the present invention includes a rim formed in a cylindrical shape such that a tire is mounted on an outer surface thereof, and a disk joined to an inner side of the rim to prevent deformation of the rim, and at least one of the rim and the disk. May be made of a tailor-made welded material to reduce the weight increase that is involved if part or all of the thickness is increased for strength reinforcement.

The disc has a first region in which a hub hole is formed at a center thereof and a bolt hole is formed to be disposed around the hub hole, and a second region extending from the first region and formed to have a cylindrical shape. The area may be made of Tailor Welded Blank (TWB).

The first area is

Thickness of the second region <thickness of the first region <(2 × thickness of the second region)

It may be formed to have.

The rim is formed so as to reduce the diameter from one side to the other side, the first section having a first stepped portion, a second section formed to extend from the other side of the first section and joined to the disk, and extending from the second section It is formed so as to increase the diameter and has a third section having a second stepped portion, at least one of the first section and the third section may be made of a Tailor Welded Tube (TWT).

The second section and the third section is formed to have the same thickness,

The first section

(Thickness of second and third sections) <thickness of first section <(thickness of 2 x second and third sections)

It may be formed to have.

The first section and the third section is formed to have the same thickness,

The second section

(Thickness of first and third sections x 1/2) <thickness of second section <(thickness of first and third sections)

It may be formed to have.

According to the present invention, even if the thickness is increased through the first section or the first and third sections made of the tailor-made welding steel sheet and the tailor-made welding tube, there is an effect of reducing the weight increase relative to the stress.

Through this, even if the thickness of each part is controlled differently according to the distribution of stress, the weight of the parts can be achieved, thereby providing an optimal durability design.

Hereinafter, with reference to the drawings, a wheel for an automobile according to an embodiment of the present invention will be described.

1 is a perspective view showing a wheel for an automobile according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a wheel for an automobile according to an embodiment of the present invention.

1 and 2, first, the wheel 100 for a vehicle according to an embodiment of the present invention includes a disc 120 and a rim 150.

On the other hand, at least one of the disk 120 and the rim 150 is a tailor-made welding material, that is, tailored welded steel sheet (Tailor Welded Blank, TWB) or Tailor Welded Tube (TWT).

The disk 120 is coupled to the inner side of the rim 150 serves to prevent deformation of the rim 150. The disk 120 may include, for example, a first region 130 and a second region 140.

The first region 130 may include a plurality of bolt holes 134 formed to be formed at the center of the hub hole 132 and disposed around the hub hole 132.

The disk 120 is mounted to the hub of the vehicle by bolts in a state in which the bolt hole 134 of the first region 130 corresponds to a bolt hole (not shown) formed in the hub of the vehicle (not shown).

In addition, the second region 140 may be formed to extend from the first region 130 and have a cylindrical shape. In addition, the second region 140 may be bonded to the rim 150 by welding.

On the other hand, the first region 130 may be made of tailored welded steel (TWB) to reduce the increase in weight due to the increase in thickness. Accordingly, the thickness of the first region 130 can be changed more easily.

That is, since the first region 130 is made of the tailored cutting steel plate (TWB), it is possible to reduce the increase in weight due to the increase in the thickness of the first region (130).

In addition, since the damage caused by the load concentrated in the first region 130 may be reduced by increasing the thickness, the required performance required for the disk 120 may be secured.

In more detail, in general, there are a Corning Fatigue Test (CFT) and a Radial Fatigue Test (RFT) as a method for evaluating the durability of an automobile wheel.

CFT is an endurance assessment for the load generated when the vehicle is turning, and the bending moment due to frictional force acts as the largest load. In addition, RFT is an endurance evaluation for the vehicle weight and tire pressure load, the load by the vehicle weight occupies approximately 70%, the remaining 30% is the tire pressure load.

Since the evaluation method corresponds to an evaluation method well known in the art, a detailed description thereof will be omitted.

On the other hand, when evaluating the endurance performance of the disk 150 by the above-described evaluation method, generally, the first region 130 provided in the disk 150, more specifically, the portion where the curvature is formed, and around the bolt hole 134 Cracks are generated. That is, the load is concentrated in the first region 130 to generate cracks in the first region 130.

However, as described above, since the first region 130 is made of the tailored cutting steel sheet TWB, it is possible to prevent the damage caused by the applied load by increasing the thickness of the first region 130 where the load is concentrated. .

In addition, it is possible to reduce the increase in weight due to the increase in thickness, thereby enabling the optimum durability design.

The second region 140 may be made of steel, that is, steel. That is, the disk 120 may be formed by bonding the first region 130 and the second region 140 made of different materials.

In addition, the disk 120 is preferably formed to have a thickness according to the following equation (1).

Thickness of the second region <thickness of the first region <(2 × thickness of the second region)-(1)

That is, the thickness of the first region 130 to which the load is concentrated is made thicker than the thickness of the second region 140 to prevent breakage of the first region 130 due to concentration of the load.

In addition, as the thickness of the first region 130 increases, the weight thereof increases with the thickness of the first region 130, and therefore, the thickness of the first region 130 may be formed to have a thickness smaller than twice the thickness of the second region 140. have.

That is, when the thickness of the first region 130 is formed to have a thickness that is greater than twice the thickness of the second region 140, there is a problem in weight reduction of the wheel 100 for the vehicle, and thus, the first region 130. The thickness of may be formed to have a thickness less than twice the thickness of the second region (140).

Rim 150 may be formed to have a cylindrical shape so that the tire is mounted on the outer surface and the hub of the vehicle is inserted into the tire. Then, the disk 120 is coupled to one side of the rim 150. Meanwhile, the rim 150 may include, for example, a first section 160, a second section 170, and a third section 180.

The first section 160 is formed to reduce the diameter from one side to the other side may have a first step portion 162. That is, in order to prevent the tire from being detached when the tire is mounted, the first section 160 is formed to reduce the diameter from one side to the other side, and prevents the tire from being separated through the first stepped part 162.

Meanwhile, the second section 170 is formed to extend from the other side of the first section 160 and is bonded to the disk 120. In other words, the second section 120 may be joined by welding with the second region 140 of the disk 120. In addition, the second section 170 serves to maintain the shape of the tire when the tire is mounted.

In addition, the third section 180 extends from the second section 170 and is formed to increase in diameter, and may have a second step 182 for preventing the tire from being separated.

On the other hand, at least one of the first section 160 and the third section 180 may be made of a Tailor Welded Tube (TWT) in order to reduce the weight increase due to the increase in thickness. Accordingly, the thickness of the first section 160 or / and the third section 180 can be changed more easily.

That is, even if the thickness of the first section 160 or / and the third section 180 is increased, the first section 160 or / and the third section 180 is made of a customized cutting weld tube (TWT) The increase in weight due to the increase in thickness of the first section 160 or / and the third section 180 can be reduced.

In addition, by increasing the thickness of the first section 160 or / and the third section 180, it is possible to reduce the breakage caused by the load concentrated on the first section 160 or / and the third section 180 The required performance required for the rim 150 can be ensured.

In more detail, when the endurance performance of the rim 150 is evaluated by the method of the Corning Fatigue Test (CFT) and the Radial Fatigue Test (RFT), the first section 160 or the third section is generally described. 180, more specifically, cracks are generated in the first and second steps 162 and 182 of the first section 160 or the third section 180. That is, the load is concentrated in the first and third sections 160 and 180 to generate cracks in the first and third sections 160 and 180.

However, as described above, since the first and third sections 160 and 180 are made of a customized cutting tube (TWT), the damage caused by the load applied by increasing the thickness of the first and third sections 160 and 180 where the load is concentrated is increased. You can prevent it.

In addition, it is possible to reduce the increase in weight due to the increase in thickness, it is possible to optimal durability design.

In addition, the second section 170 may be made of steel, that is, steel material. In addition, when only the first section 160 is made of a customized cutting tube (TWT), the third section 180 may also be made of steel, that is, a steel material.

That is, in general, since the load applied to the first section 160 is greater than the load applied to the third section 180, even if only the first section 160 is made of the customized cutting tube TWT, Since the durability of the wheel 100 can be satisfied, the third section 180 may be made of steel.

On the other hand, the rim 150 may be formed to have a thickness according to the following formula (2), (3).

First, a case in which the first section 160 is made of a customized cutting tube (TWT) and the second and third sections 170 and 180 are made of steel will be described.

In this case, the second section 170 and the third section 180 may be formed to have the same thickness.

As described above, when the first, second, and third sections 160, 170, and 180 are formed, the thickness of the rim 150 is preferably formed to have a thickness of the following Equation (2).

(Thickness of second and third sections) <thickness of first section <(thickness of 2 x second and third sections)-(2)

That is, the thickness of the first section 160 to which the load is concentrated is thicker than the thickness of the second and third sections 170 and 180 to prevent breakage of the first section 160 by the concentration of the load applied. do.

In addition, as the thickness of the first section 160 increases, the weight increases with it, so that the thickness of the first section 160 is smaller than twice the thickness of the second and third sections 170 and 180. Can be.

That is, when the thickness of the first section 160 is formed to have a thickness greater than twice the thickness of the second and third sections 170 and 180, there is a problem in weight reduction of the wheel 100 for the vehicle. The thickness of 160 may be formed to have a thickness smaller than twice the thickness of the second and third sections 170 and 180.

Next, a case in which the first and third sections 160 and 180 are made of a customized cutting tube (TWT) and the second section 170 is made of steel will be described.

In this case, the first section 160 and the third section 180 may be formed to have the same thickness.

As described above, when the first, second, and third sections 160, 170, and 180 are formed, the thickness of the rim 150 is preferably formed to have a thickness of the following Equation (3).

(Thickness of the first and third sections x 1/2) <thickness of the second section <(thickness of the first and third sections)-(3)

That is, the thickness of the first and third sections 160 and 180 to which the load is concentrated is thicker than the thickness of the second section 170 to prevent breakage of the first and third sections 160 and 180 by the concentration of the load. To help.

In addition, as the thickness of the first and third sections 160 and 180 increases, the weight increases with the thickness of the first and third sections 160 and 180, and thus the thickness of the first and third sections 160 and 180 has a thickness smaller than twice the thickness of the second section 160. It is formed to.

That is, when the thickness of the first and third sections 160 and 180 is formed to have a thickness greater than twice the thickness of the second section 170, the weight of the wheel 100 for the vehicle is problematic, and thus, the first and third sections 160 and 180 may be thinner. The thickness of the sections 160 and 180 is formed to have a thickness less than twice the thickness of the second section 170.

As described above, the first region 130 of the disk 120 made of the customized cutting steel plate (TWB), and the first and third sections of the rim 150 made of at least one customized cutting welding tube (TWT) ( Even if the thickness is increased through (160,180), it is possible to reduce the weight increase in accordance with the increase in thickness.

Through this, even if the thickness of each part is controlled differently according to the distribution of stress, it is possible to achieve the light weight of the parts, thereby providing the optimum durability design.

Hereinafter, with reference to the drawings, look at the effect of the wheel for the vehicle according to the invention through four experimental examples.

3 is an explanatory diagram for explaining a result of performing a structural analysis of a wheel for a vehicle according to the prior art, Figures 4 to 6 is a description for explaining the result of performing a structural analysis of a wheel for a vehicle according to the present invention It is also.

In other words, Figure 3 is a stress distribution showing the result of performing the structural analysis of the wheel for the car having the same thickness of the disk and the rim according to the prior art, Figure 4 is a thickness of the first region 130 of the disk 120 It is a stress distribution diagram showing the result of performing the structural analysis of the increased wheel 100 for cars, Figure 5 is a structural analysis of the wheel 100 for automobiles to increase the thickness of the first section 160 of the rim 150 6 is a structural analysis of the wheel 100 for increasing the thickness of the first region 130 of the disk 120 and the first section 160 of the rim 150. It is a stress distribution chart which shows the result of performing.

On the other hand, the table below shows the experimental data according to the above experimental example.

disk Rim Improvement Prior art 81.3 MPa 11.2 MPa - Experimental Example 1 70.8 MPa 11.7 MPa 12.9% - Experimental Example 2 81.3 MPa 8.85 MPa - 20.0% Experimental Example 3 70.8 MPa 9.26 MPa 12.9% 17.3%

In the above experiments, the durability of the wheels for automobiles was tested by the method of the Corning Fatigue Test (CFT) to evaluate the durability of the automobile wheels. In addition, the weight of the wheel for the vehicle and the wheel for the vehicle in each experimental example according to the prior art was changed the thickness of the disk and the rim to have the same weight.

Meanwhile, in the stress distribution diagrams shown in FIGS. 3 to 6, the stress in the region shown in red is the highest and the stress in the region shown in white is the lowest. That is, the stress gradually decreases in the order of the regions shown in red, orange, yellow, light green, green, and light blue.

First, FIG. 3 is a stress distribution diagram showing a result of evaluating durability performance by CFT using a wheel for automobiles having a thickness of 4.3t and a rim 150 having a thickness of 3t without changing the thickness, In the above table, it is described in the prior art column.

In more detail, in FIG. 3, the region indicated by reference numerals 10 and 20 represents the maximum stress, and the maximum stress value is 81.3 MPa in the disk 120 and 11.2 MPa in the rim 150.

Hereinafter, the experimental data to evaluate the durability performance of the vehicle wheel according to the prior art will be compared with the following experimental examples.

In Experiment 1, the thickness of the first region 130 of the disk 120 is 4.8t, the thickness of the second region 140 is 3.8t, and the thickness of the rim 150 is 3t. ) Durability is evaluated. The stress distribution diagram of Experimental Example 1 is shown in Figure 4, the experimental data is described in Experimental Example 1 of the above table.

In FIG. 4, regions indicated by the reference numerals 210 and 220 represent the maximum stresses.

Referring to this, first, the maximum stress value applied to the first region 130 of the disk 120 is 70.8 MPa, which is 12.9% compared to the maximum stress value applied to the disk of the wheel for a vehicle according to the related art. Brings an improvement.

That is, since the maximum stress value applied to the first region 130 has a smaller value than the maximum stress value applied to the disk according to the prior art, it can be seen that the durability of the first region 130 is improved. have.

As a result, the wheel 100 for a vehicle according to the present invention through Experimental Example 1, since the first region 130 is made of a tailored cutting steel (TWB) material, the load applied while reducing the weight increase even if the thickness is increased It can be seen that it can improve the durability for.

In Experimental Example 2, the thickness of the disk 120 was 4.3t, and the thickness of the first section 160 of the rim 150 was 3.5t, and the thickness of the second and third sections 170 and 180 was 2.5t. The durability of the wheel 100 is evaluated. The stress distribution diagram of Experimental Example 2 is shown in Figure 5, the experimental data is described in Experimental Example 2 of the above table.

In FIG. 5, regions indicated by the reference numerals 230 and 240 represent the maximum stresses.

In this regard, the maximum stress value applied to the first section 160 of the rim 150 is 8.85 MPa, which is an improvement of 20.0% compared to the maximum stress value applied to the rim of the wheel according to the related art. Bring it.

That is, since the maximum stress value applied to the first section 160 has a smaller value compared to the maximum stress value applied to the rim according to the prior art, it can be seen that the durability performance of the first section 160 is improved. have.

As a result, the wheel 100 for a vehicle according to the present invention through Experimental Example 2, since the first section 160 is made of a tailored cutting tube (TWT) material, the weight increase is reduced and the load applied at the same time even if the thickness is increased It can be seen that the durability against the.

In Experiment 3, the thickness of the first region 130 of the disk 120 is 4.8t, the thickness of the second region 140 is 3.8t, and the thickness of the first section 160 of the rim 150 is 3.5t. The durability of the wheel 100 for vehicles having a thickness of 2.5 t of the second and third sections 170 and 180 is evaluated.

The stress distribution diagram of Experimental Example 3 is shown in Figure 6, the experimental data is described in Experimental Example 3 of the above table.

In FIG. 6, the region indicated by 250,260 represents the maximum stress.

In this regard, the maximum stress value applied to the first region 130 of the disc 120 is 70.8 MPa, and the maximum stress value applied to the first section 160 of the rim 150 is 9.26 MPa. Compared with the maximum stress values applied to the disc and rim of the wheels for automobiles according to the prior art, the improvement is 12.9% and 17.3%, respectively.

That is, since the maximum stress value applied to the first region 130 and the first section 160 has a smaller value compared to the maximum stress value applied to the disk and the rim according to the prior art, the first region 130 has a smaller value. And the durability of the first section 160 is improved.

As a result, the wheel 100 for automobiles according to the present invention through Experimental Example 3, the first region 130 is made of a custom cutting welding steel plate (TWB), the first section 160 is a custom cutting welding tube (TWT) Since it is made of, even if the thickness is increased, the weight increase is reduced, and at the same time it can be seen that the durability against load applied is improved.

Although the configuration and features of the present invention have been described with reference to embodiments according to the present invention, the present invention is not limited thereto, and various changes or modifications can be made within the spirit and scope of the present invention. As will be apparent to those skilled in the art, such changes or modifications fall within the scope of the appended claims.

1 is a perspective view showing a wheel for an automobile according to an embodiment of the present invention.

2 is a cross-sectional view showing a wheel for an automobile according to an embodiment of the present invention.

3 is an explanatory diagram for explaining a result of performing a structural analysis of a wheel for a vehicle according to the prior art.

4 to 6 are explanatory diagrams for explaining the results of the structural analysis of the wheel for a vehicle according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: Car Wheel

120: disk

130,140: first and second regions

150: rim

160,170,180: 1st, 2nd, 3rd section

Claims (6)

A rim formed in a cylindrical shape so that the tire is mounted on the outer surface; And a disk bonded to the inside of the rim to prevent deformation of the rim. At least one of the rim and the disk is a wheel for automobiles, characterized in that made of a tailor-made welding material to reduce the weight increase accompanying a portion or the whole to increase the thickness for strength reinforcement. The disk of claim 1, wherein the disc is A first region in which a hub hole is formed at the center and a bolt hole is formed to be disposed around the hub hole, and a second region extending from the first region and formed to have a cylindrical shape, The first region is a wheel for automobiles, characterized in that made of tailored welded blank (Tailor Welded Blank, TWB). The method of claim 2, wherein the first region is Thickness of the second region <thickness of the first region <(2 × thickness of the second region) Car wheel, characterized in that formed to have. The method of claim 1 wherein the rim is A first section formed to reduce the diameter from one side to the other side and having a first stepped portion; A second section formed to extend from the other side of the first section and bonded to the disk; And And a third section extending from the second section but increasing in diameter and having a second stepped portion. At least one of the first section and the third section is a vehicle wheel, characterized in that made of Tailor Welded Tube (TWT) The method of claim 4, wherein The second section and the third section is formed to have the same thickness, The first section (Thickness of second and third sections) <thickness of first section <(thickness of 2 x second and third sections) Car wheel, characterized in that formed to have. The method of claim 4, wherein The first section and the third section is formed to have the same thickness, The second section (Thickness of first and third sections x 1/2) <thickness of second section <(thickness of first and third sections) Car wheel, characterized in that formed to have.

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