KR20110139606A - Trailing arm bush unit for vehicle - Google Patents

Abstract

PURPOSE: A trailing arm bush unit for a vehicle is provided to maximize a shock absorbing function because an insulator is composed of a main bush, made of a vibration proof rubber material, and an auxiliary bush, made of a polyurethane material. CONSTITUTION: A trailing arm bush unit(100) for a vehicle comprises an outer pipe(10), an inner pipe(30), and an insulator(50). The inner pipe is arranged inside the outer pipe. The insulator is formed between the outer and inner pipes and comprises a main bush(61) and an auxiliary bush(71). The main bush is attached on the outer surface of the inner pipe and the inner surface of the outer pipe. The auxiliary bush is inserted into the main bush. The main bush has a relatively larger elasticity coefficient than the auxiliary bush.

Description

Trailing Arm Bush Unit for Vehicle {TRAILING ARM BUSH UNIT FOR VEHICLE}

An exemplary embodiment of the present invention relates to a rear wheel suspension of a coupled torsion beam axle (CTBA) type in a rear wheel suspension of an automobile, and more particularly, to a bush unit for mounting a trailing arm to a vehicle body frame. .

In general, the suspension device of the vehicle connects the axle and the vehicle body, so that vibrations or shocks received from the road surface are not directly transmitted to the vehicle body while driving the vehicle, thereby improving the riding comfort.

Such suspension systems are largely classified into an integrated axle suspension system and an independent suspension system according to the type of axle. In general, an independent suspension system is used for a passenger car that emphasizes riding comfort or maneuverability.

Among the independent suspensions described above, the rear suspension of the coupled torsion beam axle (CTBA) type is relatively relatively low in production cost and small weight despite the fact that the design performance range is not high due to the simple components. Due to its high running stability, it has been applied mainly to the rear suspension of light and semi-medium cars.

As shown in FIG. 3, the coupled torsion beam axle (CTBA) type rear wheel suspension is provided with a torsion beam 101 in the vehicle width direction, and tires and wheels are provided at both ends of the torsion beam 101. The trailing arm 105 having the carrier 103 for mounting on one side is fixed.

Bushing units 109 and shock absorbers 107 for connecting to a frame (not shown) of the vehicle body are respectively formed at front and rear ends of each trailing arm 105, and a spring seat 111 at one rear side thereof. Is configured and the spring 113 is installed between the vehicle body.

Here, as shown in FIG. 4, the bush unit 109 is integrally fixed to the front end of the trailing arm 105 by the outer pipe 115, and the inner pipe 117 inside the outer pipe 115. Is disposed, the insulator 119 made of a dust-proof rubber material is interposed between the outer pipe 115 and the inner pipe 117 is bonded.

That is, the bush unit 109 forms a structure in which the bush unit 109 is fastened to a bush bracket (not shown) mounted on a subframe (not shown) using the bolt 123 penetrating the inner pipe 117.

However, in the prior art, since the impact force (impact) acting on the vehicle has to be absorbed only by the deformation of the insulator 119 of the anti-vibration rubber material, there is a limit in absorbing the impact force.

In addition, the prior art also uses a liquid-enclosed bush to increase the damping force of the impact force, such a liquid enclosed bush has a problem that the manufacturing process and the overall structure is complicated to cause a cost increase.

Exemplary embodiments of the present invention have been created to improve the above problems, and provide a vehicle trailing arm bush unit that can maximize shock absorption and improve aftershocks as a simple structure.

To this end, a vehicle trailing arm bush unit according to an exemplary embodiment of the present invention is for mounting the left and right trailing arms of a rear suspension to a vehicle body frame, and includes an outer pipe, an inner pipe disposed inside the outer pipe, and And an insulator formed between the outer pipe and the inner pipe, wherein the insulator includes a main bush bonded to an outer circumferential surface of the inner pipe and an inner circumferential surface of the outer pipe, and the main at regular intervals along a circumferential direction of the inner pipe. It is characterized in that it is made of a subsidiary bush bonded to the bush.

In the vehicular trailing arm bush unit, the main bush and the auxiliary bush may be made of different materials.

In the vehicular trailing arm bush unit, the main bush may be made of a relatively large elastic modulus than the auxiliary bush.

In the vehicle trailing arm bush unit, the main bush is made of anti-vibration rubber, the auxiliary bush may be made of a polyurethane material.

According to the vehicular trailing arm bush unit according to the exemplary embodiment of the present invention as described above, since the insulator is composed of a main bush made of anti-vibration rubber and an auxiliary bush made of polyurethane material excellent in shock damping performance, the insulator is dustproof. Unlike the prior art made of rubber alone, the high performance of the attenuation is achieved through the auxiliary bush, thereby maximizing the shock absorption during the wheel impact of the rear wheel and improving the aftershock to further improve the ride comfort of the vehicle.

In addition, in the present embodiment, the manufacturing process is simple and the structure is simple, compared to the conventional liquid-sealed bush which is employed to increase the damping force of the impact, it can contribute to cost reduction.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a perspective view illustrating a trailing arm bush unit for a vehicle according to an exemplary embodiment of the present invention.
2A is a cross-sectional view taken along the line AA of FIG. 1.
FIG. 2B is a cross-sectional view taken along the line BB of FIG. 1.
3 is a perspective view illustrating a typical coupled torsion beam axle (CTBA) suspension.
4 is a cross-sectional view illustrating a trailing arm bush unit for a vehicle according to the related art.

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. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

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.

In addition, 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 shown in the drawings, and is shown by enlarging the thickness in order to clearly express various parts and regions. It was.

1 is a perspective view showing a trailing arm bush unit for a vehicle according to an exemplary embodiment of the present invention, Figure 2a is a cross-sectional view taken along the line AA of Figure 1, Figure 2b is a cross section taken along the line BB of Figure 1 It is a block diagram.

Referring to the drawings, the trailing arm bushing unit 100 for a vehicle according to an exemplary embodiment of the present invention is a rear wheel suspension of a vehicle, for example of a coupled torsion beam axle (Coupled Torsion Beam Axle (CTBA) type) It can be applied to suspension.

The bush unit 100 according to the present embodiment is for mounting the left and right trailing arms 105 (see FIG. 3 below) of the CTBA suspension to a vehicle body frame (not shown) such as a rear floor side member.

In this case, the trailing arm 105 may be configured at one side of a carrier 103 (see FIG. 3) for mounting a tire and a wheel, and fixed to both ends of the torsion beam 101 (see FIG. 3).

Here, the bush unit 100 may be integrally fixed to the trailing arm 105 and fastened to a bush bracket (not shown) mounted to the vehicle body frame.

The trailing arm bush unit 100 for a vehicle according to the present embodiment has a structure that can improve the riding comfort of the vehicle by maximizing the shock absorption and improving the aftershock when the wheel impact of the rear wheel is improved by improving the configuration of the insulator.

To this end, the vehicle trailing arm bushing unit 100 according to the exemplary embodiment of the present invention basically includes an outer pipe 10, an inner pipe 30, and an insulator 50. The outer pipe 10 forms an outer cylinder and is integrally fixed to the front end of the trailing arm 105.

The inner pipe 30 is disposed inside the outer pipe 10 as an inner cylinder, and the insulator 50 is formed between the outer pipe 10 and the inner pipe 30.

The bush unit 100 forms a structure that is fastened to the above-mentioned bush bracket which is mounted on the vehicle body frame by using a mount bolt (not shown) penetrating the inner pipe 30.

In the present embodiment, the insulator 50 consists of a main bush 61 and an auxiliary bush 71, and the main bush 61 is an inner pipe 30 between the outer pipe 10 and the inner pipe 30. Is vulcanized and bonded to the outer circumferential surface of the outer circumferential surface of the outer pipe 10.

In addition, the auxiliary bush 71 is fitted and bonded to the main bush 61 at regular intervals along the circumferential direction of the inner pipe 30.

In this case, the main bush 61 and the auxiliary bush 71 is made of a heterogeneous material, the main bush 61 is made of anti-vibration rubber, the auxiliary bush 71 may be made of a polyurethane material.

Here, the main bush 61 is a relatively larger modulus of elasticity than the auxiliary bush 71, but the auxiliary bush 71 of the polyurethane material has good flexibility, excellent wear resistance and weather resistance, and the damping performance by impact It has excellent characteristics.

Looking at the manufacturing process of the bush unit 100 according to the present embodiment as described above, the hole forming portion for forming the insertion hole to be inserted into the auxiliary bush 71 in the lower mold and the outer pipe 10 in the lower mold The upper mold is coupled while the inner pipe 30 is mounted.

In this state, when the melt of the anti-vibration rubber material is injected between the upper die and the lower die, and the anti-vibration rubber is vulcanized, the main bush 61 having the above-described insertion hole between the outer pipe 10 and the inner pipe 30 is formed. To form the main bush 61 is vulcanized and bonded to the outer circumferential surface of the inner pipe 30 and the inner circumferential surface of the outer pipe 10.

After this process, the adhesive is applied to the inner circumferential surface of the insertion hole, and the auxiliary bush 71 of the polyurethane material separately processed into the insertion hole of the main bush 61 to be bonded through the adhesive and subjected to the swaging process , The manufacturing of the bush unit 100 according to the present embodiment is completed.

Therefore, according to the trailing arm bush unit 100 for a vehicle according to an exemplary embodiment of the present invention configured as described above, the insulator 50 is a main bush 61 made of anti-vibration rubber and a poly having excellent shock damping performance. Since the insulator is composed of a urethane auxiliary bush 71, the insulator exhibits a high damping performance of the impact through the auxiliary bush 71 to maximize shock absorption and impact after rear wheel impact. By improving the feeling, the riding comfort of the vehicle can be further improved.

In addition, the bush unit 100 according to the present embodiment has a simpler manufacturing process and simpler structure than the conventional liquid-enclosed bush which is employed to increase the damping force of the impact, thereby contributing to cost reduction.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

10 ... outer pipe 30 ... inner pipe
50 ... Insulator 61 ... Main Bush
71 ... Auxiliary Bush

Claims (4)

In the vehicle trailing arm bush unit for mounting the left and right trailing arms of the rear suspension to the body frame,
An outer pipe, an inner pipe disposed inside the outer pipe, and an insulator formed between the outer pipe and the inner pipe,
The insulator includes a main bush bonded to an outer circumferential surface of the inner pipe and an inner circumferential surface of an outer pipe, and an auxiliary bush fitted to the main bush at a predetermined interval along the circumferential direction of the inner pipe and bonded to the main bush. Ring arm bush unit. The method according to claim 1,
The trailing arm bush unit for a vehicle, characterized in that the main bush and the auxiliary bush made of a different material. The method according to claim 1,
The main bush,
The trailing arm bush unit for a vehicle, characterized in that the elastic modulus is relatively larger than the auxiliary bush. The method according to any one of claims 1 to 3,
The main bush is made of anti-vibration rubber, the auxiliary bushing vehicle trailing arm bush unit, characterized in that the polyurethane material.

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