Combined torsion beam axle device for vehicle

Abstract

The present invention relates to a combined torsion beam type axle device of a vehicle, comprising: a torsion beam arranged in the horizontal direction of the vehicle and combined to a left longitudinal arm and a right longitudinal arm; and a left torsion bar and a right torsion bar arranged in the inner space of the torsion beam and separated from each other along the length direction of the torsion beam, wherein the left side of the left torsion bar is connected to any one of the left longitudinal arm and the torsion beam, the right side of the right torsion bar is connected to any one of the right longitudinal arm and the torsion beam, and wherein the right side of the left torsion bar and the left side of the right torsion bar are connected to the torsion beam. The torsion stiffness of the torsion beam is adjusted by replacing the left torsion bar and the right torsion bar, specifically, the warping stiffness is adjusted by changing the position where the left torsion bar is combined with the torsion beam and the position where the right torsion bar is combined with the torsion beam.

Description

Technical Field

[0001] The present invention relates to a vehicle combined torsion beam axle device, and more particularly to a technology of a vehicle combined torsion beam axle device capable of adjusting torsional rigidity and warping rigidity. Background Art

[0002] Generally, the suspension of a vehicle is a device that connects the axle and the vehicle body to each other so that vibration or impact from the road surface is not directly transmitted to the vehicle body when the vehicle is running, so as to prevent the vehicle body or cargo from being damaged and improve the riding comfort. The vehicle suspension is mainly divided into the front suspension and the rear suspension.

[0003] The vehicle includes a combined torsion beam axle device as a rear suspension, which includes a torsion beam formed in an open loop shape with a U-shaped or V-shaped cross-section, whose left and right sides are respectively connected to a trailing arm; and a torsion bar located in an inner space of the torsion beam, which is horizontally arranged along the length direction of the torsion beam and has left and right sides respectively connected to the trailing arm.

[0004] The combined twist beam axle device as described above has fewer components, low unit cost, and especially high space utilization, and is therefore mainly applied to small and medium-sized vehicles.

[0005] However, in the conventional combined twist beam axle device, since the torsion bar for auxiliary rigidity is integrally bonded to the trailing arm by welding, the torsion bar cannot be replaced and the position of the torsion bar cannot be changed. Therefore, the torsional rigidity and the warping rigidity cannot be adjusted.

[0006] In other words, a racing car or a high-performance vehicle should be able to adjust the torsional rigidity and the warping rigidity in consideration of the driving characteristics when necessary, but in the conventional combined torsion beam axle device as described above, it is not possible to replace the torsion bar or change its position, and therefore, for a racing car or a high-performance vehicle that requires adjustment of the roll rigidity, the combined torsion beam axle device of the vehicle cannot be used.

[0007] The contents provided above as the prior art description are only intended to help understanding the background of the present invention, and should not be considered as corresponding to the prior art known to ordinary technicians in the field. Summary of the invention

[0008] An object of the present invention is to provide a vehicle-integrated torsion beam axle device, which is capable of adjusting torsional stiffness through a replaceable structure of a torsion bar, and more specifically, capable of adjusting warping stiffness through a position-variable structure of the torsion bar, thereby adjusting roll stiffness according to the driving characteristics of the driver, and can therefore be applied to ordinary vehicles, racing cars or high-performance vehicles.

[0009] According to an exemplary embodiment of the present invention, a vehicle-integrated torsion beam axle device includes: a torsion beam arranged along the horizontal direction of the vehicle and coupled to a left longitudinal arm and a right longitudinal arm; and a left torsion bar and a right torsion bar arranged in an inner space of the torsion beam and separated from each other along the length direction of the torsion beam, wherein the left side of the left torsion bar is connected to any one of the left longitudinal arm and the torsion beam, the right side of the right torsion bar is connected to any one of the right longitudinal arm and the torsion beam, and the right side of the left torsion bar and the left side of the right torsion bar are connected to the torsion beam.

[0010] The first bracket and the second bracket are fixedly coupled to the left longitudinal arm and the right longitudinal arm respectively, the left side of the left torsion bar is coupled to the first bracket to be connected to the left longitudinal arm, the right side of the right torsion bar is coupled to the second bracket to be connected to the right longitudinal arm, and when the length of the torsion beam in the horizontal direction is divided into three equal parts, the right side of the left torsion bar and the left side of the right torsion bar are respectively coupled to the middle area of ​​the torsion beam.

[0011] The first bracket and the second bracket each include two fixing portions, the two fixing portions are arranged to be spaced apart in the front-rear direction while facing each other, a first tube is inserted between the two fixing portions, the first tube is coupled to each of the left side of the left torsion bar and the right side of the right torsion bar, a first bolt passes through the two fixing portions and the first tube to be fastened to the first nut, and in a state before the first bolt and the first nut are fastened, the left side of the left torsion bar and the right side of the right torsion bar respectively rotate in a vertical direction around the first bolt.

[0012] When the length of the torsion beam in the horizontal direction is divided into three equal parts, the right side of the left torsion bar and the left side of the right torsion bar are joined to the middle area of ​​the torsion beam, and the left side of the left torsion bar and the right side of the right torsion bar are joined to the side areas located on the left and right sides of the middle area.

[0013] The second tubes are arranged in the front-to-rear direction, each second tube is coupled to the right side of the left torsion bar and the left side of the right torsion bar, the second tubes are arranged between the front and rear surfaces of the torsion beam, and the second bolts pass through the front and rear surfaces of the torsion beam and the second tubes to be fastened to the second nuts.

[0014] Holes through which the second bolts pass are formed on the twist beam to penetrate the front and rear surfaces of the twist beam, and the plurality of holes are spaced apart from each other in a vertical direction of the twist beam.

[0015] When the length of the torsion beam in the horizontal direction is divided into three equal parts, the right side of the left torsion bar and the left side of the right torsion bar are coupled to the middle area by the second bolt.

[0016] The left torsion bar and the right torsion bar can be separated from each other, and the torsion rigidity of the torsion beam is adjusted by replacing the left torsion bar and the right torsion bar.

[0017] The left torsion bar and the right torsion bar are combined to be symmetrical with respect to a center line that bisects the length of the torsion beam in the horizontal direction.

[0018] The plurality of holes are spaced apart from one another along a locus of a circle centered on a left side of the left torsion bar and a right side of the right torsion bar.

[0019] The lowest hole among the plurality of holes vertically spaced apart from each other along a circular locus may be formed at a position closest to a center line bisecting a horizontal length of the torsion beam, and the left side of the left torsion bar and the right side of the right torsion bar each have the same height as the lowest hole.

[0020] As the second bolt is tightened toward the upper hole, the warping of the torsion beam is reduced to reduce the roll stiffness; as the second bolt is tightened toward the lower hole, the warping of the torsion beam is maximized to increase the roll stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 and Figure 2 are respectively a rear view and a bottom view of a vehicle combined with a twist beam axle device according to an exemplary embodiment of the present invention;

[0022] Figure 3 and Figure 4 yes Figure 2 A cross-sectional view of a portion where the first tube and the second tube are coupled to each other;

[0023] Figure 5 is a view showing a state in which a second bolt passing through the second pipe is fastened in the lowermost hole;

[0024] Figure 6 is Figure 5 A cross-sectional view of a portion of the second tube combined therewith;

[0025] Figure 7 and Figure 8 is a view showing a state in which a left side of a left torsion bar and a right side of a right torsion bar are respectively coupled to left and right areas of a torsion beam according to another exemplary embodiment of the present invention;

[0026] Fig.9A and Fig. 9B It is a view for explaining the position where the left side of the right torsion bar is coupled to the torsion beam. Specific embodiments

[0027] Hereinafter, a combined twist beam axle apparatus of a vehicle according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

[0028] like Figures 1 to 6As shown, a combined twist beam type axle device of a vehicle according to an exemplary embodiment of the present invention includes: a twist beam 10, which is formed in an open loop shape with a U-shaped or V-shaped cross-section and opens downward, is arranged in a horizontal direction, and is respectively connected to a left trailing arm 1 and a right trailing arm 3; and a left torsion bar 20 and a right torsion bar 30, which are arranged in the inner space of the twist beam 10 so as to be separated from each other in the horizontal direction of the twist beam 10.

[0029] The left side (left end portion) of the left torsion bar 20 is coupled to any one of the left trailing arm 1 and the torsion beam 10, the right side (right end portion) of the right torsion bar 30 is coupled to any one of the right trailing arm 3 and the torsion beam 10, and the right side (right end portion) of the left torsion bar 20 and the left side (left end portion) of the right torsion bar 30 are coupled to the torsion beam 10.

[0030] Figures 1 to 3 An example structure is shown in which the left side of the left torsion bar 20 is connected to the left trailing arm 1 , and the right side of the right torsion bar 30 is connected to the right trailing arm 3 .

[0031] In other words, the first bracket 40 is fixedly coupled to the bottom surface of the left longitudinal arm 1, the second bracket 50 is fixedly coupled to the bottom surface of the right longitudinal arm 3, the left side of the left torsion bar 20 is coupled to the first bracket 40 to be connected to the left longitudinal arm 1, and the right side of the right torsion bar 30 is coupled to the second bracket 50 to be connected to the right longitudinal arm 3.

[0032] Furthermore, when the length of the torsion bar 10 in the horizontal direction is divided into three equal parts, the divided length is divided into a middle region 11 and two side regions 12 located at the left and right sides of the middle region 11. Here, the right side of the left torsion bar 20 is joined to be located at the middle region 11, and the left side of the right torsion bar 30 is joined to be located at the middle region 11.

[0033] More specifically, the first bracket 40 and the second bracket 50 are each provided with two fixing portions 41 and 51, and the two fixing portions 41 and 51 are arranged to be separated in the front-to-rear direction while facing each other, and are each coupled to the first tube 60 on the left side of the left torsion bar 20 and the right side of the right torsion bar 30, inserted between the two fixing portions 41 and 51, and the first bolt 70 passes through the two fixing portions 41, 51 and the first tube 60 to be fastened to the first nut 80.

[0034] Therefore, the left side of the left torsion bar 20 and the right side of the right torsion bar 30 may be respectively coupled to the first bracket 40 and the second bracket 50 by fastening the first bolt 70 and the first nut 80 .

[0035] In addition, the first tube 60 coupled to the left side of the left torsion bar 20 and the first tube 60 coupled to the right side of the right torsion bar 30 can respectively rotate around the first bolt 70. With this structure, in a state before the first bolt 70 and the first nut 80 are tightened, the left side of the left torsion bar 20 and the right side of the right torsion bar 30 can respectively rotate around the first bolt 70 in the vertical direction.

[0036] also, Figure 7 and Figure 8 A structure of another exemplary embodiment is shown in which the left side of the left torsion bar 20 and the right side of the right torsion bar 30 are connected to the torsion beam 10 .

[0037] In other words, when the length of the torsion beam 10 in the horizontal direction is divided into three equal parts, the right side of the left torsion bar 20 is combined to be located in the middle area 11, the left side of the right torsion bar 30 is combined to be located in the middle area 11, and the left side of the left torsion bar 20 and the right side of the right torsion bar 30 are combined to two side areas 12 located on the left and right sides of the middle area 11.

[0038] The first tubes 60 are arranged in the front-to-rear direction, each of which is coupled to the left side of the left torsion bar 20 and the right side of the right torsion bar 30 , the first tubes 60 are arranged between the front surface 13 and the rear surface 14 of the torsion beam 10 , and the first bolts 70 penetrate the front surface 13 , the first tubes 60 , and the rear surface 14 of the torsion beam 10 , and are then fastened to the first nuts 80 .

[0039] The structure in which the left side of the left torsion bar 20 and the right side of the right torsion bar 30 are coupled to the side area 12 of the torsion beam 10 exhibits the same performance as the structure in which the left side of the left torsion bar 20 is connected to the left trailing arm 1 and the right side of the right torsion bar 30 is connected to the right trailing arm 3.

[0040] Furthermore, according to the present invention, the right side of the left torsion bar 20 and the left side of the right torsion bar 30 are each separately coupled to the torsion beam 10 .

[0041] In other words, the second tubes 90 are each coupled to the right side of the left torsion bar 20 and the left side of the right torsion bar 30 to be arranged in the front-to-rear direction, the second tubes 90 are arranged between the front and rear surfaces 13 and 14 of the torsion beam 10, and the second bolts 100 penetrate the front surface 13, the second tube 90 and the rear surface 14 of the torsion beam 10, and are then fastened to the second nut 110.

[0042] Therefore, the right side of the left torsion bar 20 and the left side of the right torsion bar 30 are each respectively coupled to the torsion beam 10 by fastening of the second bolt 100 and the second nut 110 .

[0043] According to the present invention, the left torsion bar 20 and the right torsion bar 30 can be separated from each other, and thus the torsion rigidity of the torsion beam 10 can be adjusted by replacing the left torsion bar 20 and the right torsion bar 30 .

[0044] In other words, the torsional rigidity of the torsion beam 10 can be adjusted by changing the thickness or diameter of the cross section of the torsion bar. Therefore, the left torsion bar 20 and the right torsion bar 30 having the thickness or diameter of the cross section of the torsion bar suitable for adjustment can be replaced, thereby making it easier to adjust the torsional rigidity of the torsion beam 10.

[0045] Furthermore, in the present invention, the hole 15 through which the second bolt 100 passes is formed to penetrate the front surface 13 and the rear surface 14 of the twist beam 10, and the plurality of holes 15 of the twist beam 10 are spaced apart from each other in the vertical direction. The second bolt 100 passing through the second tube 90 is fastened to the second nut 110 after passing through any one of the plurality of holes 15 spaced apart from each other in the vertical direction.

[0046] The plurality of holes 15 formed in the torsion beam 10 are spaced apart from each other at equal intervals along a trajectory R1 of a circle centered on the left side of the left torsion bar 20 and the right side of the right torsion bar 30. Therefore, the rigidity can be easily adjusted by only changing the coupling position of the right side of the left torsion bar 20 and the coupling position of the left side of the right torsion bar 30 (changing the position in the vertical direction).

[0047] When the length of the torsion bar 10 in the horizontal direction is divided into three equal parts, the right side of the left torsion bar 20 and the left side of the right torsion bar 30 are coupled to the middle area 11 by second bolts 100 , respectively.

[0048] To enhance the effect of adjusting the warping stiffness of the left and right torsion bars 20 and 30 , it is advantageous to make the right side of the left and right torsion bars 20 and 30 closer to the center line C1 bisecting the length of the torsion beam 10 in the horizontal direction.

[0049] Furthermore, according to the present invention, the left torsion bar 20 and the right torsion bar 30 are combined to be symmetrical with respect to the center line C1 bisecting the length of the torsion beam 10 in the horizontal direction, and the left torsion bar 20 and the right torsion bar 30 include the holes 15 formed therein. Therefore, the same characteristics of the vehicle moving in the horizontal direction can be achieved.

[0050] The left side of the left torsion bar 20 and the right side of the right torsion bar 30 can respectively rotate around the first bolt 70 passing through the first tube 60, and thus, the right side of the left torsion bar 20 and the left side of the right torsion bar 30 can respectively rotate in the vertical direction around the first bolt 70. Therefore, the second bolt 100 passing through the second tube 90 can be fastened to the second nut 110 after passing through any one of the plurality of holes 15 spaced apart from each other in the vertical direction.

[0051] Here, as the second bolt 100 passing through the second tube 90 is tightened toward the upper hole 15 among the plurality of holes 15 spaced apart from each other in the vertical direction, the warping of the torsion beam 10 is mitigated to reduce the roll rigidity. In addition, as the second bolt 100 passing through the second tube 90 is tightened toward the lower hole 15 among the plurality of holes 15 spaced apart from each other in the vertical direction, the warping of the torsion beam 10 is maximized to improve the roll rigidity.

[0052] In other words, according to the present invention, the warping stiffness of the torsion beam 10 can be adjusted by changing the position where the second bolt 100 is fastened. Figure 1 and Figure 4 As shown, when the second bolt 100 is fastened to the first nut 110 by passing through the uppermost hole 15, the warping stiffness is reduced to the greatest extent, and as shown in FIG. Figure 5 and Figure 6 As shown, when the second bolt 100 is fastened to the second nut 110 by passing through the hole 15 located at the lowermost portion, the warping rigidity increases to be maximized.

[0053] According to the present invention, when the length of the torsion beam 10 along the horizontal direction is divided into three equal parts, the right side of the left torsion bar 20 and the left side of the right torsion bar 30 are connected to the middle area 11 by the second bolt 100, so that the warping stiffness of the torsion beam 10 can be more easily adjusted.

[0054] Advantageously, since the right side of the left torsion bar 20 and the left side of the right torsion bar 30 are closer to the center line C1 that bisects the length of the torsion beam 10 in the horizontal direction, the adjustment effect of the warping stiffness is improved.

[0055] If the second bolt 100 passing through the second tube 90 is coupled to be located not in the middle region 11 of the torsion beam 10 but in the side region 12 of the torsion beam 10, the distance between the right side of the left torsion bar 20 and the left side of the right torsion bar 30 becomes wide. In this case, even if the fastening position of the second bolt 100 is changed in the vertical direction, the warping rigidity of the torsion beam 10 may not be adjusted.

[0056] Therefore, in the present invention, the second bolt 100 is combined to be located at the middle area 11 of the torsion beam 10. Therefore, since the distance between the right side of the left torsion bar 20 and the left side of the right torsion bar 30 can be narrowed as much as possible, the warping stiffness of the torsion beam 10 can be easily adjusted by changing the fastening position of the second bolt 100.

[0057] In addition, if Fig.9AAs shown, in the middle area 11 of the torsion beam 10, the lowest hole 15 among the plurality of holes 15 vertically formed along the circular trajectory R1 may be formed at a position closest to the center line C1 bisecting the length of the torsion beam 10 in the horizontal direction. For this reason, the left side (first bolt 70) of the left torsion bar 20 and the right side (first bolt 70) of the right torsion bar 30 respectively have the same height as the lowest hole 15. Therefore, the right side of the left torsion bar 20 and the left side of the right torsion bar 30 are respectively as close to the center line C1 (M1) as possible, and thus, the reinforcing effect of the warping rigidity can be improved to the greatest extent.

[0058] like Fig. 9B As shown, if the left side of the left torsion bar 20 (first bolt) and the right side of the right torsion bar 30 (first bolt 70) are both higher than the lowermost hole 15, the lowermost hole 15 is away from the center line C1 (M2), and the distance between the right side of the left torsion bar 20 and the left side of the right torsion bar 30 becomes wider. In this case, even if the fastening position of the second bolt 100 is changed in the vertical direction, the warping stiffness of the torsion beam 10 may not be adjusted.

[0059] Therefore, in order to smoothly adjust the warping rigidity of the torsion beam 10, the lowest hole 15 among the plurality of holes 15 vertically formed along the circular locus R1 in the middle region 11 of the torsion beam 10 may be formed at a position closest to the center line C1 bisecting the length of the torsion beam 10 in the horizontal direction. To achieve this, the left side (first bolt) of the left torsion bar 20 and the right side (first bolt 70) of the right torsion bar 30 each have the same height as the lowest hole 15.

[0060] As described above, the combined twist beam axle device for a vehicle according to the present invention has a structure in which the torsional rigidity of the twist beam 10 can be adjusted by replacing the left torsion bar 20 and the right torsion bar 30, and more specifically, the warping rigidity of the twist beam 10 can be adjusted by changing the position where the right side of the left torsion bar 20 is coupled to the twist beam 10 and the position where the left side of the right torsion bar 30 is coupled to the twist beam 10. Therefore, since the roll rigidity can be adjusted according to the driving characteristics of the driver, the combined twist beam axle device for a vehicle according to the present invention can be applied to ordinary vehicles as well as racing cars or high-performance vehicles.

[0061] While the present invention has been shown and described with respect to the particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A combined torsion beam axle device for a vehicle, comprising: a torsion beam arranged along the horizontal direction of the vehicle and coupled to the left and right trailing arms; as well as The left torsion bar and the right torsion bar are arranged in the inner space of the torsion beam and are separated from each other along the length direction of the torsion beam. Wherein, the left side of the left torsion bar is connected to any one of the left trailing arm and the torsion beam through a first bolt, The right side of the right torsion bar is connected to any one of the right trailing arm and the torsion beam through another first bolt. The right side of the left torsion bar and the left side of the right torsion bar are respectively connected to the torsion beam through second bolts. When the length of the torsion beam in the horizontal direction is divided into three equal parts, the right side of the left torsion bar and the left side of the right torsion bar are connected to the middle area of ​​the torsion beam. The left side of the left torsion bar is coupled to the side region located on the left side of the middle region, and the right side of the right torsion bar is coupled to the side region located on the right side of the middle region. The torsion beam comprises a hole through which the second bolt passes, and the hole passes through the front surface and the rear surface of the torsion beam. wherein the plurality of holes are spaced apart from each other along the vertical direction of the torsion beam, and The plurality of holes are spaced apart from each other along trajectories of circles centered on the left side of the left torsion bar and the right side of the right torsion bar.

2. The combined torsion beam axle device according to claim 1, in, The first bracket and the second bracket are fixedly coupled to the left longitudinal arm and the right longitudinal arm respectively. The left side of the left torsion bar is coupled to the first bracket to be connected to the left trailing arm. wherein the right side of the right torsion bar is coupled to the second bracket to be connected to the right trailing arm, and Wherein, when the length of the torsion beam along the horizontal direction is divided into three equal parts, the right side of the left torsion bar and the left side of the right torsion bar are respectively coupled to the middle area of ​​the torsion beam.

3. The combined torsion beam axle device as claimed in claim 2, in, The first bracket and the second bracket each include two fixing portions, the two fixing portions being arranged to be spaced apart in the front-rear direction while facing each other, wherein a first tube is interposed between the two fixing portions, the first tube being coupled to each of a left side of the left torsion bar and a right side of the right torsion bar, wherein the two fixing parts and the first pipe are fastened to the first nut by the first bolt passing through the first nut, and Wherein, before the first bolt and the first nut are tightened, the left side of the left torsion bar and the right side of the right torsion bar rotate in a vertical direction around the first bolt respectively.

4. The combined torsion beam type axle device according to claim 1, wherein: The left torsion bar and the right torsion bar are separable from each other, and the torsion rigidity of the torsion beam is adjusted by replacing the left torsion bar and the right torsion bar.

5. The combined twist beam type axle device according to claim 1, wherein: The left torsion bar and the right torsion bar are combined to be symmetrical with respect to a center line that bisects the length of the torsion beam in the horizontal direction.

6. A combined torsion beam axle device for a vehicle, comprising: a torsion beam arranged along the horizontal direction of the vehicle and coupled to the left and right trailing arms; as well as The left torsion bar and the right torsion bar are arranged in the inner space of the torsion beam and are separated from each other along the length direction of the torsion beam. Wherein, the left side of the left torsion bar is connected to any one of the left trailing arm and the torsion beam through a first bolt, The right side of the right torsion bar is connected to any one of the right trailing arm and the torsion beam through another first bolt. The right side of the left torsion bar and the left side of the right torsion bar are respectively connected to the torsion beam through second bolts. wherein the second tubes are arranged in the front-rear direction, each of the second tubes being coupled to the right side of the left torsion bar and the left side of the right torsion bar, wherein the second tube is arranged between the front surface and the rear surface of the torsion beam, wherein the front and rear surfaces of the torsion beam and the second tube are fastened to the second nut by the second bolt passing through the second nut, The torsion beam comprises a hole through which the second bolt passes, and the hole passes through the front surface and the rear surface of the torsion beam. wherein the plurality of holes are spaced apart from each other along the vertical direction of the torsion beam, and The plurality of holes are spaced apart from each other along trajectories of circles centered on the left side of the left torsion bar and the right side of the right torsion bar.

7. The combined torsion beam type axle device according to claim 6, wherein: When the length of the torsion beam in the horizontal direction is divided into three equal parts, the right side of the left torsion bar and the left side of the right torsion bar are coupled to the middle area of ​​the torsion beam by the second bolt.

8. The combined twist beam type axle device according to claim 6, wherein: The left torsion bar and the right torsion bar are separable from each other, and the torsion rigidity of the torsion beam is adjusted by replacing the left torsion bar and the right torsion bar.

9. The combined twist beam type axle device according to claim 6, wherein: The left torsion bar and the right torsion bar are combined to be symmetrical with respect to a center line that bisects the length of the torsion beam in the horizontal direction.

10. The combined torsion beam type axle device as claimed in claim 6, in, The lowermost hole of the plurality of holes vertically spaced from each other along the trajectory of the circle is arranged at a position closest to a center line bisecting the horizontal length of the torsion beam, and The first bolt located on the left side of the left torsion bar and the other first bolt located on the right side of the right torsion bar are respectively located at the same height as the lowermost hole.

11. The combined twist beam type axle device according to claim 6, wherein: As the second bolt is tightened toward the upper hole, the warping of the torsion beam is reduced to reduce the roll stiffness; as the second bolt is tightened toward the lower hole, the warping of the torsion beam is maximized to increase the roll stiffness.

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