KR20130010672A

KR20130010672A - Structure for preventing trailing arm from bending in ctba suspension

Info

Publication number: KR20130010672A
Application number: KR1020110071447A
Authority: KR
Inventors: 남태현
Original assignee: 현대자동차주식회사
Priority date: 2011-07-19
Filing date: 2011-07-19
Publication date: 2013-01-29

Abstract

PURPOSE: A trailing arm bending prevention structure for a CTBA(Coupled Torsion Beam Axle) suspension is provided to reduce the number of suspension parts by integrating a trailing arm, a spring seat and a damper bracket. CONSTITUTION: A trailing arm bending prevention structure for a CTBA(coupled torsion beam axle) suspension includes a trailing arm(12), a spring seat(13), a damper bracket(14), and a wheel mounting bracket(15). The trailing arm is formed on both ends of a tubular torsion beam(11). The spring seat comprises a spring(21) mounted on the trailing arm. A damper(22) is mounted on the damper bracket. A wheel(23) is mounted on the wheel mounting bracket. The spring seat, the damper bracket, and the wheel mounting bracket are altogether prepared on one side of the twist axis of the trailing arm. The spring, the damper, and the wheel are altogether installed on one side of the twist axis.

Description

Structure for preventing trailing arm from bending in CTBA suspension

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspended torque suspension (CTBA) suspension device, and relates to a trailing arm bending prevention structure of a CTBA suspension device that prevents bending of a trailing arm in a CTBA suspension device by changing positions of springs and dampers.

The CTBA suspension system is mainly applied to small vehicles because of its low number of parts, excellent durability, simple structure, easy maintenance, and relatively inexpensive compared to other suspension systems.

As shown in FIG. 1 and FIG. 2, a tubular torsion beam 101 and a trailing arm 102 are provided at both ends of the torsion beam 101. Each trailing arm 102 is provided with a wheel mounting bracket 105, a spring seat 103 and a damper bracket 104. An anti-roll bar (not shown) is provided inside the torsion beam 101 to suppress rolls and reinforce rigidity, and the spring sheet 103 and the damper bracket 104 have a spring for reducing vibration due to driving. 21 and the damper 22 are mounted.

However, in the CTBA suspension device according to the related art having the above structure, the spring 21 and the damper 22 are located on the opposite side to the wheel 23 about the torsion axis BC of the trailing arm 102, The trailing arm 102 is forced to bend due to the road excitation due to the running.

That is, as illustrated in FIG. 3, when the moment applied to the trailing arm 102 is diagrammed, the spring 21 and the damper 22 are positioned to one side with respect to the torsion axis BC of the trailing arm 102. Since the wheel 23 is located on the opposite side, torsion is applied to the trailing arm 102. 3, the torsional moment applied to the torsional axis BC of the trailing arm 102, the torsional moment applied by the wheel 23, the torsional moment applied by the spring 21 and the damper 22. All the torsional moments applied by it act counterclockwise.

Therefore, since the torsional moment which is applied to the trailing arm 102 is continuously applied as the driving continues, the durability of the trailing arm 102 is lowered, which not only affects the life of the CTBA suspension system and the vehicle, but also the ride comfort. It becomes a factor to inhibit.

The structure of the CTBA suspension system as described above is also disclosed in the following prior art document.

KR 10-2008-0055184 A, FIG. 1 KR 10-2011-0062752 A, FIG. 1

The present invention has been invented to solve the above problems, and an object of the present invention is to provide a trailing arm bending prevention structure of a CTBA suspension having a structure capable of canceling the torsion applied to the trailing arm.

Another object of the present invention is to provide a trailing arm bending prevention structure of a CTBA suspension that can integrate the trailing arm, the spring seat and the damper bracket to reduce the number of parts of the CTBA suspension.

The trailing arm bending prevention structure of the CTBA suspension device according to the present invention for achieving the above object is provided with a trailing arm at both ends of the tubular torsion beam, the spring seat and the damper is seated on the trailing arm In the CTBA (Coupled Torsion Beam Axle) suspension having a damper bracket to be mounted and a wheel mount bracket to which the wheel is mounted, the spring seat, the damper bracket and the wheel mounting bracket are all provided on one side of the torsion shaft of the trailing arm. , Spring, damper and wheel are all characterized in that provided on one side of the torsion shaft.

Here, the spring seat, the damper bracket and the wheel mounting bracket are preferably provided on the trailing arm so as to be located outside the torsion axis of the trailing arm in the CTBA suspension.

In addition, it is preferable that the spring seat and the damper bracket are integrally formed on the trailing arm.

In addition, the trailing arm is formed by coupling the upper trailing arm member and the lower trailing arm member, the spring sheet is formed on one side of the upper trailing arm member, the damper bracket is the upper trailing arm member and the lower trailing arm The upper damper bracket portion and the lower damper bracket portion respectively formed on the rear end of the member are characterized in that the coupling is made.

According to the trailing arm bending prevention structure of the CTBA suspension device according to the present invention having the configuration as described above, the torsional moment by the spring and damper and the torsional moment by the wheel because the wheel, spring, damper is located on one side of the trailing arm As they cancel and act in opposite directions, the torsional moment applied to the trailing arm is reduced.

As such, since the torsional moment applied to the trailing arm is reduced, the stress of the main crack is reduced, and the durability of the trailing arm is improved.

Due to the improved durability of the trailing arm, the overall life of the CTBA suspension system is increased.

In particular, the durability improvement of the trailing arm was a major development factor of the CTBA suspension device, but by the present invention can reach the durability improvement of the trailing arm, it is possible to reduce the development cost.

1 is a partial perspective view of a CTBA suspension according to the prior art,
2 is a plan view of a CTBA suspension according to the prior art,
3 is a moment diagram of the CTBA suspension according to the prior art,
4 is a partial perspective view of a CTBA suspension device to which the trailing arm bending prevention structure of the CTBA suspension device according to the present invention is applied;
5 is a plan view of a CTBA suspension device to which the trailing arm bending prevention structure of the CTBA suspension device according to the present invention is applied;
6 and 7 are an enlarged exploded view and an exploded perspective view of the CTBA suspension device to which the trailing arm bending prevention structure of the CTBA suspension device according to the present invention is applied;
8 is a moment diagram of a CTBA suspension device to which the trailing arm bending prevention structure of the CTBA suspension device according to the present invention is applied.

Hereinafter, a trailing arm bending prevention structure of a CTBA suspension device according to the present invention will be described in detail with reference to the accompanying drawings.

The trailing arm bending prevention structure of the CTBA suspension according to the present invention, as shown in Figures 4 to 8, the spring seat 13, the damper bracket 14 to one side of the torsion axis BC of the trailing arm 12 And the wheel mounting bracket 15 are positioned so that the spring 21, the damper 22 and the wheel 23 are all located on one side of the torsion shaft BC when applied to the vehicle.

The spring seat 13, the damper bracket, and the wheel mounting bracket 15 constituting the CTBA suspension system 10 are all positioned on one side of the torsion axis BC of the trailing arm 12.

In the CTBA suspension device according to the related art described in FIG. 1, the wheel mounting bracket, the spring seat, and the damper bracket are located on different sides of the torsion axis of the trailing arm. Located on the other side.

However, unlike the CTBA suspension according to the prior art, the CTBA suspension according to the present invention is the spring seat 13, the damper bracket 14 and the wheel mounting to one side of the torsion axis BC of the trailing arm 12 The brackets 15 are all positioned.

That is, as shown in FIG. 5, the spring seat 13 and the damper bracket 14 are positioned at the side where the wheel mounting bracket 15 is located with respect to the torsion shaft BC of the trailing arm 12, thereby assembling the vehicle. When complete, the wheel 23, the spring 21 and the damper 22 are all located on one side with respect to the torsion axis BC of the trailing arm 12. Here, the wheel 23, the spring 21 and the damper 22 are all located on one side of the torsion axis BC of the trailing arm 12, the wheel 23 is inside the CTBA suspension 10 Since the spring 21 and the damper 22 may also be located outside the trailing arm 12, the spring 21 and the damper 22 may be mounted on the outer side of the trailing arm 12. 13 and the damper bracket 14 to be formed.

On the other hand, the torsion axis BC of the trailing arm 12 passes through the mounting point of the trailing arm 12 and analyzes the torsion of the trailing arm 12 in a virtual straight line perpendicular to the tubular torsion beam 11. It is a standard.

As such, the wheel 23, the spring seat 13, and the damper bracket 14 are positioned at one side of the torsion shaft BC of the trailing arm 12, thereby reducing the bending moment applied to the trailing arm 12. Referring to FIG. 8, various vibrations are transmitted from the road surface to the vehicle body as the vehicle travels. The trailing arms 12 cancel each other and the bending moments applied to the trailing arms 12 are reduced to the trailing arms 12. ) To prevent torsion.

In FIG. 8, the forces acting on the spring 21, the damper 22 and the wheel center in the vertical direction with respect to the trailing arm 12 are primarily shown. In the wheel mounting bracket 15 equipped with the wheel 23 according to the road surface condition, the force of + Fz_W according to the bump acts on the wheel center and the reaction force is applied to the spring 21 and the damper 22 by -Fz_S, Fz_D acts, and each force acts as a torsional moment by a distance away from the torsional axis BC. However, since the + Fz_W, -Fz_S, and -Fz_D are all located on the same side with respect to the torsion axis BC, the torsional moments due to the forces cancel each other out.

Therefore, the torsional size of the trailing arm = wheel center Fz moment-damper Fz moment-spring Fz moment, and 'damper Fz moment + spring Fz moment' act in the same direction as the wheel center Fz moment, thereby increasing the torsion. Compared to the CTBA suspension, the torsional size is reduced because they act in opposite directions and cancel each other out.

6 and 7, the trailing arm 12, the spring seat 13, and the damper bracket 14 are integrally formed, thereby reducing the number of parts of the CTBA suspension device 10. , The process of assembling the spring seat and the damper bracket separately configured trailing arm 12 is omitted during the assembly process. The trailing arm 12 is formed by coupling the upper trailing arm member 12a and the lower trailing arm member 12b to each other, and the spring sheet 13 is integrally formed on one side of the upper trailing arm member 12a. Process as much as possible. In addition, an upper damper bracket portion 14a and a lower damper bracket portion 14b are formed at the rear end of the upper trailing arm member 12a and the rear trailing arm member 12b, respectively, and the upper trailing arm member 12a. ) And the lower trailing arm member 12b, the damper bracket portion 14a and the lower damper bracket portion 14b are coupled to each other to form a damper bracket 14.

10: CTBA suspension device 11: tubular torsion beam
12: trailing arm 12a: upper trailing arm member
12b: lower trailing arm member 13: spring seat
14: damper bracket 14a: upper damper bracket portion
14b: lower damper bracket portion 15: wheel mounting bracket
21: spring 22: damper
23: wheel

Claims

A trailing arm is provided at both ends of the tubla torsion beam, and a spring seat on which the spring is seated on the trailing arm, a damper bracket on which a damper is mounted, and a wheel mount bracket on which a wheel is mounted. In the suspension system,
The spring seat, damper bracket and the wheel mounting bracket are all provided on one side of the torsion shaft of the trailing arm, the spring, damper and wheel are all provided on one side of the torsion shaft trailing arm bending prevention structure of the CTBA suspension .

The method of claim 1,
The spring seat, the damper bracket and the wheel mounting bracket are provided on the trailing arm so as to be located outside the torsion axis of the trailing arm in the CTBA suspension device.

The method of claim 1,
The trailing arm bending prevention structure of the CTBA suspension, characterized in that the spring seat and the damper bracket is integrally formed on the trailing arm.

The method of claim 3,
The trailing arm is made by combining an upper trailing arm member and a lower trailing arm member with each other,
The spring sheet is formed on one side of the upper trailing arm member,
The damper bracket is a trailing arm bending prevention structure of the CTBA suspension, characterized in that the upper damper bracket portion and the lower damper bracket portion formed at the rear end of the upper trailing arm member and the lower trailing arm member are coupled to each other.