KR102029844B1

KR102029844B1 - Coupled torsion beam axle type suspension system

Info

Publication number: KR102029844B1
Application number: KR1020140070197A
Authority: KR
Inventors: 김준
Original assignee: 현대자동차 주식회사
Priority date: 2014-06-10
Filing date: 2014-06-10
Publication date: 2019-10-08
Also published as: KR20150141453A

Abstract

A coupled torsion beam axle type suspension is disclosed. The disclosed coupled torsion beam axle type suspension device connects the trailing arms to both ends of the torsion beam, and the left and right trailing arms form a mounting bushing unit for mounting with the vehicle body at the front end, and a spring inside the rear side of the torsion beam. The spring seat and shock absorber pins for mounting the gears and the spindle brackets for mounting the carriers on the rear and outer sides thereof, the mounting bushing unit is fixed to the vehicle body through the mounting bolt and the outer end of the trailing arm as an outer cylinder. An inner member penetrates the member, a moving block screwed to the outer circumferential surface of the inner member, and a bush rubber vulcanized between the inner circumferential surface and the moving block of the outer member.

Description

Coupled Torsion Beam Axle Type Suspension {COUPLED TORSION BEAM AXLE TYPE SUSPENSION SYSTEM}

An embodiment of the present invention relates to a rear wheel suspension for a vehicle, and more particularly, to a coupled torsion beam axle type suspension that can induce an understeer during bump or rebound according to the turning of the vehicle.

In general, the coupled torsion beam axle (CTBA) type suspension system has a relatively high running stability in comparison to low production cost and small mass, despite the fact that the design performance range is not high due to the simple component configuration. It has been applied mainly to the rear suspension of light and semi-medium cars.

The structure of the coupled torsion beam axle (CTBA) type suspension device, as shown in Figure 1, is provided with a torsion beam 101 in the vehicle body transverse direction, both ends of the torsion beam 101 is a tire and a wheel The trailing arm 105 with the carrier 103 for mounting is welded and fixed.

Behind each trailing arm 105 is a spring absorber pin 113 for connecting the shock absorber 111 and the spring seat 109 for mounting the spring 107 is configured. In addition, a mounting bush unit 115 for connecting to the vehicle body is configured at the tip of each trailing arm 105.

Here, the mounting bush unit 115, as shown in Figure 2, the outer race 125 is fixed to the tip of the trailing arm 105, the inner race 127 inside the outer race 125 ) Forms the bush 121 through the bush rubber 129, and forms a structure that is fastened to the bush bracket 123 on the vehicle body side by using the bolt 131 penetrating the inner race 127.

Coupled torsion beam axle type suspension having such a configuration is characterized by the deformation of the wheel (Wheel) due to the torsional deformation characteristics of the torsion beam 101 located in the center, the deformation and trailing of the torsion beam 101 Due to the position of the arm 105 and the characteristics of the mounting bushing unit 115, the toe-in may be induced at the time of the bump.

That is, when the vehicle is turning, the understeer tendency should be maintained in consideration of the stability of the vehicle. To this end, the turning outer ring of the rear wheel side is guided to the toe-in, and the turning inner ring of the rear wheel side is ideally guided to the toe-out.

However, in the conventional coupled torsion beam axle-type suspension as shown in FIG. 3, the lateral force F1 and the braking force F2 are applied to the turning outer ring W1 on the rear wheel side where bumps occur during turning driving or turning braking. ) Has a tendency to be input to the toe out, and rebound occurs inside the turning, so the turning inner ring (W2) maintains the set toe angle as it is or shows a tendency of toe-in. There are disadvantages.

Matters described in this Background section are intended to enhance the understanding of the background of the invention, and may include matters other than the prior art already known to those skilled in the art.

Embodiments of the present invention provide a coupled torsion beam axle type suspension device that can improve the turning stability of the vehicle by inducing the understeer by varying the geometry as the torsional rotational force generated during bumping or rebounding according to the turning of the vehicle. I would like to.

Coupled torsion beam axle-type suspension according to an embodiment of the present invention, the trailing arms are connected to both ends of the torsion beam, respectively, and the left and right trailing arms have a mounting bush unit for mounting with the vehicle body at the front end thereof. And a spring seat for mounting the spring and a shock absorber pin at the rear inner side thereof, and a spindle bracket for mounting the carrier at the rear outer side thereof, wherein the mounting bushing unit is fixed to the vehicle body through a mounting bolt. And an inner member penetrating and installed in the outer member of the trailing arm tip as an outer cylinder, a movable block screwed to an outer circumferential surface of the inner member, and a bush rubber vulcanized between the inner circumferential surface of the outer member and the movable block. can do.

In addition, in the coupled torsion beam axle type suspension device according to an embodiment of the present invention, when the torsional rotation of the trailing arm is moved in the lateral direction along the inner member, inducing the lateral movement of the trailing arm can do.

In addition, in the coupled torsion beam axle-type suspension device according to an embodiment of the present invention, the inner circumferential surface of the outer member moves the outer member in the front-rear direction during the torsional rotation of the trailing arm, and the front-rear direction of the trailing arm Induction projections may be formed to induce movement.

In addition, in the coupled torsion beam axle-type suspension device according to an embodiment of the present invention, the outer projection surface of the movable block may be formed with a locking projection which is engaged with the guide projection.

In addition, in the coupled torsion beam axle-type suspension device according to an embodiment of the present invention, the inner member is made of a pipe shape in which the mount bolt is fitted, the male thread may be formed on the outer peripheral surface thereof.

In addition, in the coupled torsion beam axle-type suspension device according to an embodiment of the present invention, the movable block is formed with a coupling hole into which the inner member is fitted, and the male thread of the inner member is screw-coupled to the inner peripheral surface of the coupling hole. Female threads may form.

Embodiments of the present invention induce the lateral movement of the trailing arm through the axial torsion of the outer member and the movement of the inner member when bump or rebound occurs according to the turning of the vehicle, the guide protrusion of the outer member and the locking of the movable block The projections can induce the forward and backward movement of the trailing arm.

Therefore, in the embodiment of the present invention, the steering stability of the vehicle can be further improved by inducing the understeer of the vehicle body by varying the geometry with respect to the turning direction of the vehicle.

Since these drawings are for reference in describing embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a perspective view of a typical coupled torsion beam axle-type suspension.
2 is a cross-sectional view taken along line AA of FIG. 1.
3 is a view illustrating steering characteristics during turning driving of a coupled torsion beam axle-type suspension according to the prior art.
Figure 4 is a perspective view of a coupled torsion beam axle-type suspension in accordance with an embodiment of the present invention.
Figure 5 is a schematic cross-sectional view showing a mounting bushing unit applied to the coupled torsion beam axle-type suspension in accordance with an embodiment of the present invention.
6a and 6b are views for explaining the operation of the coupled torsion beam axle-type suspension according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

Since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those illustrated in the drawings, and the thicknesses are enlarged to clearly express various parts and regions.

In the following detailed description, the names of the configurations are divided into first, second, and the like in order to distinguish them in the same relationship, and the description is not necessarily limited to the order in the following description.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

In addition, the terms "... unit", "... means", "... part", "... member", etc. described in the specification refer to a unit of a comprehensive configuration that performs at least one function or operation. it means.

Figure 4 is a perspective view of a coupled torsion beam axle-type suspension in accordance with an embodiment of the present invention.

4, the coupled torsion beam axle-type suspension device 100 according to an embodiment of the present invention is provided with a torsion beam (1) in the transverse direction of the vehicle body, both ends of the torsion beam (1) and the tire The trailing arm 5 with the carrier 3 for mounting the wheel is welded fixed.

At the rear of each trailing arm 5 is a spring absorber 9 for mounting the spring 7 and a shock absorber pin 13 for connecting the shock absorber 11. In addition, a mounting bushing unit 15 for connecting to the vehicle body is formed at the tip of each trailing arm 5.

The mounting bush unit 15 is made of a structure that can improve the swing stability of the vehicle by inducing understeer by varying the geometry as a torsional rotational force generated during bump or rebound due to the turning of the vehicle.

Figure 5 is a schematic cross-sectional view showing a mounting bushing unit applied to the coupled torsion beam axle-type suspension in accordance with an embodiment of the present invention.

4 and 5, in the embodiment of the present invention, the mounting bush unit 15 is fixed to the vehicle body through the mounting bolt (B) and as an outer cylinder to the outer member 21 at the tip of the trailing arm (5). An inner member 31 to be penetrated and a movable block 41 screwed to an outer circumferential surface of the inner member 31, and a bush rubber 51 vulcanized and bonded between the inner circumferential surface of the outer member 21 and the movable block 41. ) Is included.

Here, the inner member 31 has a pipe shape in which the mount bolt B is fitted. The mount bolt B penetrates the hollow of the inner member 31 and is fastened to the bush bracket 33 mounted to the vehicle body.

On the outer circumferential surface of the inner member 31 is formed a male screw thread 35 to which the moving block 41 to be described later will be screwed in a male and female manner.

In addition, a coupling hole into which the inner member 31 is fitted is formed in the movable block 41, and an internal thread 45 of which the male thread 35 of the inner member 31 is screwed to the inner circumferential surface of the coupling hole. Is formed.

In this case, since the movable block 41 is screwed to the outer circumferential surface of the inner member 31 fixed to the vehicle body through the bush bracket 33, the movable block 41 is applied to the torsional rotational force generated when bumps or rebounds are generated due to the turning of the vehicle. It is moved in the lateral direction along the axial direction of the inner member 31 can induce the deformation of the bush rubber 51 and the lateral movement of the trailing arm (5).

The bush rubber 51 may be vulcanically bonded between the inner circumferential surface of the outer member 21 and both ends of the inner member 31, and between the inner circumferential surface of the outer member 21 and the outer circumferential surface of the movable block 41.

Meanwhile, in the exemplary embodiment of the present invention, the outer circumferential surface of the outer member 21 moves the outer member 21 in the front and rear directions by the axial twist of the trailing arm 5 when bumping or rebounding due to the turning of the vehicle. An induction protrusion 71 for inducing deformation of the bush rubber 51 and forward and backward movement of the trailing arm 5 is formed.

The guide protrusion 71 is formed to protrude at a predetermined interval on the inner circumferential surface of the outer member 21, for example, may be formed to protrude in the form of a triangular rib on the inner circumferential surface of the outer member 21.

In addition, corresponding to the guide protrusion 71 of the outer member 21, a locking protrusion 81, which is engaged with the guide protrusion 71, protrudes from the outer peripheral surface of the movable block 41.

The locking protrusion 81 pushes the guide protrusion 71 when the moving block 41 moves in the lateral direction, so that the guide protrusion 71 moves the outer member 21 of the trailing arm 5 in the front and rear directions. It may be formed to protrude in the form of a triangular rib corresponding to).

Therefore, according to the coupled torsion beam axle-type suspension device 100 according to the embodiment of the present invention configured as described above, for example, when the bump occurs due to the turning of the vehicle, the outer of the trailing arm (5) The member 21 has an axial twist around the inner member 31 fixed to the vehicle body.

6A and 6B, since the movable block 41 is screwed to the outer circumferential surface of the inner member 31, the movable block (1) may be moved by the axial twist of the outer member 21. 41 is moved in the transverse direction along the axial direction of the inner member 31 and can induce deformation of the bush rubber 51 and transverse movement of the trailing arm 5.

In this process, in the embodiment of the present invention, the locking protrusion 81 of the moving block 41 pushes the guide protrusion 71 of the outer member 21 forward to move the outer member 21 of the trailing arm 5. It can move forward and induce deformation of the bush rubber 51 and forward movement of the trailing arm 5.

As described above, according to the coupled torsion beam axle type suspension device 100 according to the embodiment of the present invention, the axial twist and the inner member of the outer member 21 when bump or rebound occurs due to the turning of the vehicle ( 31 to induce the lateral movement of the trailing arm (5), the trailing arm (5) through the guide projection (71) of the outer member 21 and the locking projection (81) of the movable block (41). ) Forward and backward movement can be induced.

Although the embodiments of the present invention have been described above, the technical idea of the present invention is not limited to the embodiments presented herein, and those skilled in the art to understand the technical idea of the present invention are configured within the scope of the same technical idea. Other embodiments may be easily proposed by the addition, modification, deletion, addition, etc. of elements, but this is also within the scope of the present invention.

1 ... torsion beam 3 ... carrier
5 ... trailing arm 7 ... spring
9 ... Spring Seat 11 ... Shock Absorber
13 ... Shock absorber pin 15 ... Mounting bush unit
21 ... Outer member 31 ... Inner member
33.Bush bracket 35.Male thread
41 moving block 45 female thread
51 ... bush rubber 71 ... induction protrusion
81 ... Hanging projection B ... Mount bolt

Claims

A trailing arm is connected to both ends of the torsion beam, respectively, and the left and right trailing arms form a mounting bushing unit for mounting the vehicle body at the front end thereof, and a spring seat and shock absorber for mounting the spring inside the rear side thereof. As a coupled torsion beam axle-type suspension, which constitutes a pin and a spindle bracket for mounting a carrier on the rear outside thereof,
The mounting bush unit is fixed to the vehicle body through the mounting bolt and the inner member penetrates to the outer member of the trailing arm tip as an outer cylinder, a movable block screwed to the outer peripheral surface of the inner member, and the inner peripheral surface of the outer member Coupled torsion beam axle-type suspension, characterized in that it comprises a bush rubber vulcanized between the moving block.

The method of claim 1,
The moving block is,
Coupled torsion beam axle type suspension device, characterized in that when the torsional rotation of the trailing arm is moved in the lateral direction along the inner member, inducing the lateral movement of the trailing arm.

The method according to claim 1 or 2,
On the inner circumferential surface of the outer member is formed an induction protrusion for moving the outer member in the front-rear direction during the torsional rotation of the trailing arm and inducing the front-rear movement of the trailing arm,
Coupled torsion beam axle-type suspension, characterized in that the engaging projection is formed on the outer circumferential surface of the movable block and the engaging projection.

The method of claim 1,
The inner member is made of a pipe shape in which the mount bolt is fitted, the male thread is formed on the outer peripheral surface thereof,
Coupled torsion beam axle-type suspension device is characterized in that the moving block is formed with a coupling hole into which the inner member is fitted, and an internal thread of the male thread of the inner member is formed on the inner circumferential surface of the coupling hole.