KR100228976B1 - Suspension system for a vehicle - Google Patents

Abstract

A suspension device to which a torsion bar is applied, the suspension device of which a spring rate of the torsion bar can be varied when turning, thereby providing a vehicle suspension device that can improve ride comfort and turning safety;

A suspension device having a torsion bar arranged in the vehicle body longitudinal direction at a rear end of an upper arm shaft that fixes the vehicle body side end of the upper control arm to the vehicle body,

An anchor arm mounted on the rear end of the torsion bar so as to protrude in a direction orthogonal to the torsion bar, and including a spring rate adjusting means for rotating the free end of the anchor arm to vary the degree of torsion of the torsion bar during turning; The present invention provides a suspension device for a vehicle.

Description

Suspension of automobile

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

2 is a hydraulic system applied to the present invention.

3 is another embodiment according to the present invention.

4 is a perspective view of a conventional suspension device.

[Industrial use]

The present invention relates to a suspension device for an automobile, and more particularly, in a suspension device to which a torsion bar is applied, by allowing the spring constant of the torsion bar to be changed during turning, the riding comfort and the turning safety. It relates to a vehicle suspension that can improve the.

[Private Technology]

Generally, a suspension system in a vehicle is connected between a tire and a vehicle body to absorb vibrations and shocks received from the road surface while driving to improve ride comfort and vehicle safety. For this purpose, the spring rate in the up and down direction should be flexible, and the mounting part should be firm on the body to overcome the driving force, the braking force, the centrifugal force during turning, etc.

Suspension system as described above is structurally divided into an integrated axle suspension and an independent suspension, the integrated axle suspension is applied to large vehicles such as buses, vans, etc., the independent suspension is divided axles, both wheels are related to each other. It is designed to be used for passenger cars and small commercial vehicles.

In addition to the up and down vibration of the car body, the vehicle is also equipped with rolling, pitching, and yawing while driving, and it is necessary to flexibly absorb these vibrations from the suspension system to provide a comfortable ride as well as driving performance. ) Is improved.

In such a vibration of the vehicle body, the vibration generated during the turning of the vehicle is caused by the inclination of the vehicle body inclined toward the outside of the turning, and the occurrence and time of this rolling ring have a great influence on the direction stability during the turning. Go crazy.

Accordingly, the suspension device has a means capable of appropriately suppressing the above-described rolling, for example, a stabilizer bar and a torsion bar are mounted on the wishbone type suspension device.

That is, the wishbone type suspension system includes upper and lower control arms 100 and 102, as shown in FIG. A wheel support 104 for rotatably supporting wheels at the ends of the upper and lower control arms 100 and 102; The upper and lower ends include a shock absorber 106 connected to the vehicle body and the lower control arm 102 to exert a damping force.

And the torsion bar 110 is connected to the vehicle body longitudinal direction to the rear end of the upper arm shaft 108 that fixes the vehicle body side end of the upper control arm 100 to the vehicle body, the rear end of the torsion bar 110 thereof An anchor arm 112 was attached to the vehicle, and an adjustment bolt 114 was connected to the free end of the anchor arm 112 and connected to the vehicle body.

Accordingly, the vibration and shock input from the wheel are transmitted to the shock absorber 106 through the upper and lower control arms 100 and 102 to be attenuated thereto, and according to the rotation of the upper arm 100, the torsion bar is rotated. As the 110 is twisted, the shock absorption and the roll rate are adjusted.

However, in the conventional suspension system, it is installed in a state with one spring constant, and if the torsion bar letting the ride comfort first give a high roll rate (deg / g) at the round, the stay rate is adjusted to adjust these roll rates. It is equipped with the Villar Bar 116, which also causes the weak vibration of the left and right wheels when the projection bumps while driving straight, and it is difficult to secure the linearity of the roll rate against the change in the turning acceleration (lateral-G) when turning There has been a problem.

In the case of the torsion bar, when the initial tolerance and the load are maximized, there is a problem in that the spring deformation is changed to non-linearity, thereby failing to implement a flexible roll at the time of the roll.

[Summary of invention]

Therefore, to solve the above problems of the present invention, an object of the present invention is a suspension device to which a toe bar bar is applied, varying the spring rate of the torsion bar (spring rate or spring constant) when turning It is intended to provide a vehicle suspension that can improve ride comfort and turning performance according to driving conditions.

Another object of the present invention is to simplify the configuration of the suspension device by eliminating the stabilizer bar by achieving the above object.

In order to realize this, the present invention provides a suspension device having a torsion bar arranged in the vehicle body longitudinal direction at the rear end of the upper arm shaft for fixing the vehicle body side end of the upper control arm to the vehicle body.

An anchor arm is mounted on the rear end of the torsion bar so as to protrude in a direction orthogonal to the torsion bar, and a spring rate adjusting means for rotating the free end of the anchor arm to vary the degree of torsion of the torsion bar during turning. To provide a suspension of a vehicle.

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.

EXAMPLE

1 is a perspective view of a suspension device according to the present invention, the suspension device of the present invention includes a wheel support 1 for rotatably supporting the wheel; Upper and lower control arms (3) (5) for connecting the upper and lower parts of the wheel support (1) to the vehicle body; The upper and lower ends include a shock absorber 7 connected to the vehicle body and the lower control arm 5 to exert a damping force.

The torsion bar 11 is connected to the vehicle body in the longitudinal direction by the reverse of the fixing pin 9 which fixes the vehicle body side end of the upper control arm 3 to the vehicle body, and the rear end of the torsion bar 11 thereof. An anchor arm 13 was mounted, and a spring rate adjusting means 15 was provided at the free end of the anchor arm 13.

As described above, the spring rate adjusting means 15 rotates the anchor arm 13 while the operating rod 17 is stretched by hydraulic pressure as in FIGS. 1 and 2 to vary the degree of twist of the torsion bar 11. Directional valve for converting the actuator 19 and the flow path for selectively supplying and discharging the hydraulic pressure supplied from the hydraulic pump 21 to the upper and lower hydraulic chambers 23 and 15 of the actuator 19 ( 27); It comprises an electronic control unit 31 for receiving the steering signal from the steering sensor 29 to control the direction change valve (27).

Referring to the operation of the apparatus of the present invention configured as described above, during normal straight running, a flow path is formed as shown in FIG. 2 to maintain a state such as a solid line in which the torsion bar 11 is not twisted.

In this state, the right wheel of the suspension device of FIG. 1 is illustrated as an example, and when it is turned based on this as an example, the following is described.

That is, when the vehicle turns left, the right wheel is bound, and the electronic control unit 31 that receives the signal that the vehicle turns right from the steering sensor 29 controls the direction switching valve 27 to control the lower portion of the actuator 19. The hydraulic pressure of the upper hydraulic chamber 23 is discharged while supplying the hydraulic pressure to the hydraulic chamber 25.

Then, the operating rod 17 of the actuator 19 is contracted while lifting the free end of the anchor arm 13. As such, when the tip of the anchor arm 13 is lifted up, the rear end of the torsion bar 11 is watched. Direction, and the right wheel is twisted in the counterclockwise direction of the front end of the torsion bar 11 by the left-bound binding, thereby preventing the vehicle body from being inclined greatly by offsetting these twisting directions. As the weight of the vehicle moves from the left wheel to the right wheel, the cornering force of the tire is ultimately adjusted so that the understeer coefficient (deg / g) can be adjusted during turning, improving turning performance. It is possible.

On the contrary, when the vehicle turns right, the hydraulic pressure is supplied to the upper hydraulic chamber 23 of the actuator 19, the hydraulic pressure of the lower hydraulic chamber 25 is discharged, and the free end of the anchor arm 13 is rotated clockwise. Rotation of the wheel, and the front end portion of the torsion bar 11 is twisted in the counterclockwise direction by the rebound of the wheel, which is offset from each other to prevent the vehicle body from inclining greatly and also adjusts the amount of movement of the understeer coefficient. (deg / g) is variable to ensure proper direction safety.

3 shows another embodiment according to the present invention. In the present invention, the actuator 19 using hydraulic pressure is formed as the spring rate adjusting means 15. In another embodiment, the rear end of the torsion bar 11 is provided. The sector gear 33 is mounted, and the rack 39, which is moved up and down by the rotation of the lead screw 37 driven by the step motor 35, is engaged with each other. .

As described above, according to the present invention, in the suspension apparatus to which the torsion bar is applied, the spring rate of the torsion bar can be changed during the turning, thereby improving the riding comfort and the turning safety.

And since the roll is minimized, the configuration of the suspension device can be simplified by omitting the stabilizer bar.

Claims (3)

A wheel support for rotatably supporting the wheel, upper and lower control arms connecting upper and lower portions of the wheel support to the vehicle body, and a shock absorber having upper and lower ends connected to the vehicle body and the lower control arm to exert damping force; A suspension device for a vehicle comprising a torsion bar arranged in the longitudinal direction of a vehicle body at a rear end of an upper arm shaft that fixes the vehicle body side end of the upper control arm to the vehicle body, the vehicle suspension being orthogonal to the torsion bar at the rear end of the torsion bar. And a spring rate adjusting means for mounting the anchor arm so as to protrude in the direction of rotation, and for rotating the free end of the anchor arm to vary the degree of twist of the torsion bar during turning. The method of claim 1, wherein the spring rate adjustment means is mounted to the rear end of the torsion bar, the sector gear is configured to engage the rack up and down by the rotation of the lead screw driven by the step motor to the step motor of the steering sensor Suspension device for a vehicle, characterized in that the electronic control unit that recognizes the steering signal to control. According to claim 1, The spring rate adjusting means is an actuator for rotating the anchor arm while the operating rod is stretched by the hydraulic pressure to vary the degree of torsion of the torsion bar, and the hydraulic pressure supplied from the hydraulic pump to the upper and lower hydraulic chamber of the actuator A suspension device for converting a flow path that can be supplied and discharged to the vehicle, and a suspension device for a vehicle comprising an electronic control unit for controlling the direction switching valve receives a steering signal from the steering sensor.