KR20080011606A - Torsion beam suspension system of vehicle - Google Patents

Abstract

A torsion beam suspension system for a vehicle is provided to change an open direction of a torsion beam by using an actuator according to travel condition. A torsion beam suspension system for a vehicle comprises trailing arms(102,104) connected with two ends of a torsion beam(100), and a torsion beam rotation member. The torsion beam rotation member has two ends connected with the trailing arms such that the torsion beam rotation member rotates. The torsion beam rotation member comprises a connector(120) and an actuator(122). The connector is attached to the front end of the torsion beam and rotates at the trailing arm. The actuator rotates the connector under the control of an ECU (Electronic Control Unit) according to travel condition of a vehicle. The connector has an inner wheel gear section and the actuator has an outer wheel gear section corresponding to the inner wheel gear section.

Description

Torsion Beam Suspension System for Cars {TORSION BEAM SUSPENSION SYSTEM OF VEHICLE}

1 is a perspective view of a typical torsion beam suspension device.

2 is an operation of the suspension according to FIG.

3 is a view for explaining the center of rotation according to the shape of the torsion beam.

4 is a view for explaining the position of the center of rotation according to the shape of the torsion beam.

5 is a view showing a change in the tow of the downward open beam;

6 is a view showing a tow change of the rear open beam;

7 is a view showing a tow change of an upward open beam;

8 is a perspective view of the suspension according to the present invention.

9 is an enlarged view of main parts of the invention;

Figure 10 is an exploded perspective view showing a connection state of the torsion beam and the motor.

11 is a block diagram of a system for operating the present invention.

12 is a view showing a state in which the torsion beam is changed to the rear open type according to the present invention.

The present invention relates to a torsion beam suspension of an automobile, and more particularly, a torsion beam suspension of an automobile in which a tow characteristic is appropriately changed by varying an open direction of the torsion beam according to driving conditions. Relates to a device.

Suspension system in the vehicle effectively blocks the irregular input of the road surface generated while driving the vehicle, providing a comfortable ride comfort of the occupant, and appropriately control the shaking of the car body caused by the driver's driving behavior and the curvature of the road, driving convenience When driving on irregular roads, the vertical load on the tire ground plane should be maintained at an appropriate level to satisfy the basic conditions of ensuring the stability of the vehicle during turning and braking.

In order to satisfy the above conditions, various kinds of suspension devices have been developed and applied to actual vehicles. As an example, a torsion beam type suspension device can be cited. It has the advantage that the wheel functions as an independent suspension and acts as an integral part when bumping and rebounding.

Looking at the general configuration of such a torsion beam type suspension, trailing arms (4) (6) are integrally formed at both ends of the torsion beam (2) arranged in the vehicle width direction, as shown in Figs. Wheel supports 12 and 14 supporting the wheels 8 and 10 are integrally formed outside the trailing end of the trailing arms 4 and 6.

The front end of the trailing arms 4 and 6 protrudes to the front side of the torsion beam 2 so that mount portions 16 and 18 are formed at the tip portion thereof, and rubbers are mounted on the mount portions 16 and 18. The vehicle is mounted on the vehicle body via a bush, and shock absorbing means including coil springs 20 and 22 and shock absorbers 24 and 26 are disposed on the rear side of the trailing arms 4 and 6.

Accordingly, when the rear portion of the trailing arm moves up and down with the wheel according to the condition of the road surface and the vehicle driving state, the lifting movement is performed by using the mount as a hinge, and the up and down vibration and shock are attenuated by the buffer means. At the same time it is absorbed flexibly by the appropriate elastic force of the rubber bush.

In such a suspension device, the center of rotation (SHEAR CENTER, SC) is formed in the middle portion of the torsion beam 2 as shown in FIG.

The position of the center of rotation (SC) will vary depending on the shape of the torsion beam (2), Figure 3 is divided into the torsion beam (2), one side shows a downward open type, the other side is shown as a rear open type.

3 and 4, the center of rotation SC1 is formed on the upper side of the torsion beam 2, and the center of rotation is formed on the front side of the torsion beam 2 as shown in FIGS.

That is, it can be seen that the center of rotation (SC1, 2) is formed on the opposite side of the opening direction, the center of rotation is directly related to the geometry characteristics of the wheel, in particular, toe characteristics, in the case of the lower open type with a high center of rotation As shown in FIG. 5, it can be seen that the toe change is large for the bump or the rebound of the wheel.

In the case of the rear open type, the toe change is smaller than that of the lower open type as in FIG. 6, but the toe-out characteristic appears in the diameter of the bump during tolerance, and the upper open type is the lower open type or the rear as shown in FIG. 7. The open type is opposite to the toe characteristic.

Accordingly, the upper open type and the rear open type have toe-in characteristics with respect to bumps or rebounds when turning and going straight, and there is an advantage that the understeer is guided and the vehicle can be stably progressed.

However, the two systems as described above have a limited toe-in characteristic value according to the wheel's behavior, and therefore, there is a limit in attitude control of a stable vehicle that satisfies all driving conditions.

In other words, if the two systems are used, the lower open type has a larger toe change than the rear open type, but if the toe in value is large, the steering force becomes large, which makes steering difficult, and after a little toe-out, the toe-in becomes larger gradually at the beginning of turning. Although it helps to drive a sense of stability, it is true that both have some limits in the stability of the driving.

Therefore, the present invention has been invented to solve the above problems, an object of the present invention is to change the open direction of the torsion beam according to the driving situation, by appropriately varying the tow characteristics to improve the driving stability To provide a torsion beam suspension of.

In order to achieve this, the present invention, the trailing arm is connected to both ends of the torsion beam disposed in the vehicle width direction, and supports the wheel to the outside of the rear end of the trailing arm, the front end of the trailing arm torsion beam In the torsion beam suspension device which protrudes to the front side of the vehicle and its tip portion is mounted to the vehicle body,

The torsion beam is open downward, but its both ends are rotatably connected to the trailing arm, and the torsion beam rotating means is formed thereon.

The torsion beam rotating means may further include a connector attached to the torsion beam tip to be rotatably coupled to the trailing arm, and an actuator capable of rotating the connector according to the driving situation of the vehicle by controlling the electronic control unit. Characterized in that made.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

FIG. 8 is a perspective view of a torsion beam assembly applied to the suspension according to the present invention, which is composed of the same parts as in FIG.

The torsion beam 100 is connected to trailing arms 102 and 104 at both ends, and a wheel carrier, not shown, for rotatably supporting the wheel outside the trailing end of the trailing arm 102 and 104. The brackets 106 and 108 to which the is mounted are integrally formed.

The front end portions of the trailing arms 54 and 56 protrude to the front side of the torsion beam 100 by a predetermined length so that the mount portions 110 and 112 are formed at the front end portions thereof, and the mount portions 110 and ( 112 is mounted on the vehicle body via a rubber bush (not shown).

In addition, the inner portion of the wheel carrier brackets 106 and 108 is provided with a shock absorbing means, not shown, consisting of a coil spring and a shock absorber.

In the suspension device formed as described above, the present invention forms the torsion beam 100 in a downward open type as shown in FIG. 9, and both ends thereof are rotatably connected to the trailing arms 102 and 104. The rotating means was configured.

9 and 10, the torsion beam rotating means is attached to the tip of the torsion beam 100 and is rotatably coupled to the trailing arms 102 and 104, and the connector 120. It consists of an actuator 122 that can rotate.

In the above, the actuator 122 refers to a motor, and any one may be used as long as it can rotate the connector while being controlled by the electronic control unit in addition to the motor.

In order to prevent slippage between the connector 120 and the actuator 122, an inner ring gear 124 is formed at an outer center of the connector 120, and the rotor 126 of the actuator 122 is formed. Has formed an outer ring gear portion 128 corresponding to the inner ring gear portion 124 to allow spline coupling to each other.

 In addition, the actuator 122 is not shown, but is fixed using a suitable means, the actuator 122 is electrically connected to the electronic control unit (ECU) as shown in Fig. 11 to its electronic control unit (ECU) Is controlled by

The electronic control unit ECU controls the actuator 122 by accurately measuring the driving situation of the vehicle from detection means such as the vehicle speed sensor 130, the roll sensor 132, and the lateral acceleration sensor 134. do.

According to the suspension device of the present invention configured as described above, the current driving state of the vehicle is precisely measured from various sensors 130, 132 and 134 in the electronic control unit (ECU) and compared with the mapped information, and then the torsion beam The actuator 122 is controlled by determining how much to rotate 100.

Then, the torsion beam 100 maintains an initial downward open type as shown in FIG. 9, and then becomes a rear open type as shown in FIG. 12, or changes to an upper open type as shown in FIG. 12 according to the operation of the actuator 122.

That is, the actuator 122 is operated by determining an appropriate tow value according to the driving condition of the vehicle and determining the open direction of the torsion beam 100 to realize the tow value.

For example, the actuator 122 is operated to induce a slight toe out at the beginning of the turning so that the torsion beam 100 is open upward. It's going to be open.

In addition, since the height of the roll center is changed as shown in FIG. 13 according to the open shape of the torsion beam 100, it is preferable to have an appropriate roll center according to various positions of the torsion beam 100.

As described above, according to the present invention, it is an invention that can improve the running stability by varying the tow characteristics and the roll center height of the open-type torsion beam according to the driving situation of the vehicle as a simple structure.

Claims (3)

A trailing arm is connected to both ends of the torsion beam disposed in the vehicle width direction, supports a wheel to the outside of the trailing end of the trailing arm, and the front end of the trailing arm protrudes to the front side of the torsion beam so that the tip portion thereof is In the torsion beam suspension mounted to the vehicle body, The torsion beam suspension device of claim 1, wherein the torsion beam is opened downward, and both ends thereof are rotatably connected to the trailing arm and the torsion beam rotating means is formed thereon. The torsion beam rotating means is a connector attached to the torsion beam tip and rotatably coupled to the trailing arm, and the electronic control unit can rotate the connector according to the driving situation of the vehicle by controlling the electronic control unit. Torsion beam suspension of a vehicle, characterized in that it comprises an actuator. 3. The torsion beam suspension of a vehicle according to claim 2, wherein the connector and the rotor of the actuator are splined to each other.

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