KR100957161B1 - Semi-trailing arm type suspension system of vehicle - Google Patents

Abstract

A toe variable stage is constructed between the center rear mounting bracket and the body of the subframe, and the toe of the wheel is variably controlled by varying the connection position between the front end of the center rear mounting bracket and the body according to the turning direction. Provided is a semi-trailing arm suspension for a vehicle that prevents the attitude of the wheels from leading to toe-out, thereby improving the followability and turning stability required for the rear wheel suspension.

Semi trailing arm, subframe, mounting bracket, toe

Description

Semi-Trailing Arm Type Suspension for Vehicles {SEMI-TRAILING ARM TYPE SUSPENSION SYSTEM OF VEHICLE}

The present invention relates to a semi-trailing arm suspension for a vehicle, and more particularly, to a semi-trailing arm suspension for a vehicle that is applied to the rear wheel of the vehicle to increase the understeer performance.

In general, the suspension of the vehicle exists between the body and the axle, and the two rigid bodies are connected by one or more links, and are supported by springs and shock absorbers in the vertical direction and high in the other directions. By harmonizing stiffness and flexibility properly, the mechanical balance of the relative movement between the body and the wheels is achieved.

Such a suspension device firstly effectively blocks the irregular input of the road surface generated while driving the vehicle to provide a comfortable riding comfort of the occupant, and secondly, appropriately controls the shaking of the vehicle body caused by the driver's driving behavior and the curvature of the road surface. Convenience should be provided, and third, the basic conditions of ensuring the stability of the vehicle during turning and braking driving should be satisfied by maintaining the vertical load at the tire ground plane at an appropriate level when driving on irregular roads.

In order to satisfy the above conditions, various types of suspension devices have been developed and applied to actual vehicles. As an example, a general configuration of a low-cost semi-trailing arm type suspension device having a simple configuration is illustrated in FIG. As shown, the sub-frame 102 is a cylindrical member whose middle portion is curved to the rear side, and the center rear mounting bracket 104 and both front mounting portions having a predetermined length on the rear portion and the front portion of both ends thereof. Brackets 106 and 108 are formed.

The center rear and both front mounting brackets 104, 106 and 108 are mounted to the vehicle body via vertical insulators 110, 112 and 114, respectively.

In addition, a semi trailing arm 116 is connected to both rear portions of the sub-frame 102, and the semi trailing arm 116 is formed of an A shape, and two mounting bushes 118 and 120 are connected to the sub-frame. The wheel carrier 124 is mounted to the frame 102 and supports the wheel 122 so as to be rotatable outside the rear end.

Accordingly, the wheel 122 rotates in the vertical direction with the mounting bushes 118 and 120 as the hinges.

In addition, the stabilizer bar 126 for suppressing the lifting and lowering of the semi-trailing arm 116 in the opposite direction according to the road surface condition and the inclination of the vehicle body and eventually suppressing the roll of the vehicle has a predetermined shape and has both sides thereof. Both ends mounted on the subframe 102 and bent backwards are connected to the semi trailing arm 116.

In addition, the semi trailing arm 116 has a coil spring 128 and the shock absorber 130 is arranged to act as a buffer for the lifting movement of the trailing arm 116.

However, in the conventional suspension as described above, as shown in FIGS. 2 and 3, the semi trailing arm 116 is connected only to the front subframe 102, and thus the rear side of the mounting bushes 118 and 120. When a certain load, that is, a front and rear force F1 and a lateral force Fy, or the like is input from the wheel 122 positioned at, or as the braking force F2 is input, as shown in FIG. It does not have a structure that can support it.

As a result, when the front and back force F1 and the lateral force Fy or the braking force F2 are applied to the wheel 122, the semi trailing arm 116 applies a rotational load as shown by the arrows in FIGS. 2 and 3. However, all of these loads must be accommodated in the bush rubbers of the mounting bushes 118 and 120, so that the rear wheels mounted on the semi trailing arm 116 by the deformation of the bush rubber are Likewise, it exhibits a toe out tendency, which presents a disadvantage of undermining understeer of the vehicle.

As described above, when the front and rear forces F1 and the lateral force Fy or the braking force F2 are applied to the wheels 122, the attitude of the wheels 122 tends to tow out when the wheels 122 are bumped. The lack of tracking and turning stability required in the rear wheel suspension of an automobile implies a problem that ultimately adversely affects the steering stability.

Therefore, the present invention has been invented to solve the above problems, the problem to be solved by the present invention is to configure the tow variable stage between the center rear mounting bracket and the vehicle body of the sub-frame of the center rear mounting bracket according to the turning direction By changing the connection position between the front end and the body, the vehicle's toe is variably controlled to prevent the wheel's attitude against toe, lateral, and braking force from being led to the toe-out, thereby improving the tracking and turning stability required for the rear suspension. It is to provide a semi trailing arm suspension.

Semi-trailing arm suspension device for a vehicle of the present invention for realizing the technical problem as described above is disposed in the vehicle width direction sub-frame is supported in the lower body through the central rear mounting bracket and both front mounting bracket; A semi trailing arm mounted at a rear outer side through a spindle mounting end and connected to each rear end of the subframe through respective mounting bushes; In a semi-trailing arm suspension device for a vehicle, which is arranged between the semi-trailing arm and the vehicle body, spring and shock absorbers,

The tow variable stage is configured between the central rear mounting bracket of the sub-frame and the vehicle body to variably control the tow of the wheel by converting the connection position of the front end of the central rear mounting bracket and the vehicle body according to a control signal of the controller.

The toe variable stage is disposed so as to correspond to the front end of the central rear mounting bracket is mounted to the lower portion of the body, the rail block on the cross section in the slide rail in the vehicle width direction; A slider slidably installed on a slide rail of the rail block, the upper surface of the slider being pivotally fastened to the front end of the central rear mounting bracket; A connection link having one end pivoted to a pivot bracket configured at a lower side of the vehicle body opposite to the slider, and the other end pivoted to the slider together with the front end of the central rear mounting bracket; It is mounted on the rail block corresponding to both ends of the slider, respectively, characterized in that it consists of two-sided electric actuator for driving forward and backward in accordance with the control signal of the controller to slide the slider to both sides.

The controller is characterized in that it comprises a control logic for outputting the forward drive signal to the electric actuator in the rotational direction in accordance with the lateral acceleration signal input by the acceleration sensor, and the reverse drive signal to the electric actuator in the reverse direction of rotation.

As described above, according to the semi-trailing arm suspension device for a vehicle of the present invention, a toe variable stage is formed between the center rear mounting bracket of the subframe and the vehicle body and the connection position between the front end of the central rear mounting bracket and the vehicle body according to the turning direction. By varying the wheel's toe, the wheel's toe is variably controlled to prevent the wheel's attitude toward toe-out and lateral or braking force from being led to toe-out, which improves the tracking and turning stability required for the rear suspension. It can be effective.

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.

4 is a plan view illustrating a semi trailing arm suspension according to an embodiment of the present invention, and FIGS. 5 and 6 are left and right sides of a vehicle to which a semi trailing arm suspension is applied according to an embodiment of the present invention. This is a conceptual view of the operation when turning.

In the vehicle semi-trailing arm suspension according to the present embodiment, as illustrated in FIG. 4, the subframe 2 is provided in the vehicle width direction.

The sub-frame (2) is a cylindrical member whose middle portion is curved to the rear side, and the center rear and both front mounting brackets (4) (6) having a predetermined length on each of the rear portion and the front portion of both ends thereof. (8) is formed.

The two front mounting brackets 6 and 8 are mounted to the vehicle body with vertical insulators 12 and 14 interposed therebetween.

In addition, a semi trailing arm 16 is connected to both rear portions of the sub-frame 2, and the semi trailing arm 16 is formed in an A shape to serve through two mounting bushes 18 and 20. A wheel carrier 24 mounted to the frame 2 and rotatably supporting the wheel 22 on the outside of the rear end is provided through the spindle mounting end 25.

On the other hand, the stabilizer bar 26, which suppresses the roll of the vehicle, is mounted on both sides of the subframe 2 through the mounter 27, and both ends are connected to the semi trailing arm 16, respectively. Through).

In addition, the semi trailing arm 16 has a spring 30 and the shock absorber 32 is arranged to act as a buffer for the lifting movement of the semi trailing arm (16).

In the semi trailing arm type suspension having this configuration, the central rear mounting bracket 4 on the subframe 2 is installed between the vehicle bodies via a toe variable stage 40, the toe variable stage 40. ) Is configured to variably control the toe of the wheel by converting the connection position of the front end of the central rear mounting bracket 4 and the vehicle body in accordance with the control signal of the controller 41.

Specific configuration of the tow variable stage 40, as shown in Figure 4, the rail block 43 is disposed so as to correspond to the front end of the central rear mounting bracket 4 is mounted to the lower part of the vehicle body, On the cross section of the rail block 43, a slide rail 45 is formed in the vehicle width direction.

On the slide rail 45 of the rail block 43, a slider 47 is slidably installed.

The front end of the central rear mounting bracket 4 is pivoted on the upper surface of the slider 47.

In addition, a pivot bracket 49 is fastened to one side of the lower side of the vehicle body opposite to the slider 47, and a connection link 51 is pivoted through one end thereof to the pivot bracket 49.

The other end of the connecting link 51 is pivoted to the slider 47 together with the front end of the central rear mounting bracket 4.

In addition, the electric actuators 53 and 55 are mounted on the rail blocks 43 respectively corresponding to both ends of the slider 47.

The left and right electric actuators 53 and 55 are configured to slide forward and backward along the slide rail 45 by driving forward and backward according to the control signal of the controller 41.

Here, the controller 41 outputs a forward drive signal to the electric actuator 53 or 55 in the swing direction according to the lateral acceleration signal input by the acceleration sensor 57, and the electric actuator 53 or 55 in the reverse direction to the swing. ) Includes a control logic for outputting a reverse drive signal.

Therefore, the semi-trailing arm suspension for a vehicle having the above-described configuration, when the vehicle turns, the controller 41 receives a lateral acceleration signal detected by the acceleration sensor 57 and the left and right electric actuators 53 and 55. Will output a control signal.

Then, the left and right electric actuators 53 and 55 are driven opposite to each other to move the slider 47 to the left or the right to change the connection position between the front end of the center rear mounting bracket 4 and the vehicle body and thereby to the subframe 2. ) Rotates somewhat in the turning direction to induce the turning outer ring to move in the toe-in direction.

When the operation is described in detail with reference to the left turning of the vehicle, as shown in FIG. 5, when both wheels are left and right symmetrical with respect to the vehicle body and the left turning is performed while driving straight, the acceleration sensor Numeral 57 outputs the left turning lateral acceleration signal to the controller 41.

Then, the controller 41 drives the left electric actuator 53 forward, and the right electric actuator 55 drives backward to move the slider 47 to the right.

Accordingly, the connection position between the front end of the center rear mounting bracket 4 and the vehicle body moves to the right, and the subframe 2 is rotated counterclockwise as a whole, and the right wheel W1, which is the turning outer ring at this time, is tow-in. It is induced and tends to understeer.

In addition, when the vehicle is specifically described on the basis of the right turning time, as shown in FIG. 6, when both wheels are left and right symmetrical with respect to the vehicle body and the right driving is performed while driving straight, the acceleration sensor ( 57 outputs the right turning lateral acceleration signal to the controller 41.

Then, the controller 41 drives the right electric actuator 55 forward, and the left electric actuator 53 drives backward to move the slider 47 to the left.

Accordingly, the connection position between the front end of the center rear mounting bracket 4 and the vehicle body is moved to the left side so that the subframe 2 is rotated clockwise as a whole, and the left wheel W2, which is the turning outer ring at this time, is led to the toe-in. This tends to understeer.

As described above, the vehicle semi-trailing arm suspension of the present invention adjusts the toe-out tendency of the front and rear forces F1, the lateral force Fy, and the braking force F2 of the turning outer ring to toe-in, so that the rear suspension is understeer. To have a tendency.

1 is a plan view of a typical semi-trailing arm suspension.

2 is an operation conceptual diagram when the front and rear force and the lateral force act on the wheel of the semi-trailing arm suspension according to the prior art.

3 is a conceptual view of the operation when the braking force is applied to the wheel of the semi-trailing arm suspension according to the prior art.

4 is a plan view illustrating a semi trailing arm suspension according to an exemplary embodiment of the present invention.

FIG. 5 is a conceptual view of the vehicle when turning left of a vehicle to which a semi trailing arm suspension according to an exemplary embodiment of the present invention is applied.

FIG. 6 is a conceptual view illustrating the operation of the vehicle to which the semi-trailing arm suspension is applied according to an embodiment of the present invention. FIG.

Claims (3)

A sub-frame disposed in the vehicle width direction and supported at the lower portion of the vehicle body through a central rear mounting bracket and both front mounting brackets; A semi trailing arm mounted at a rear outer side through a spindle mounting end and connected to each rear end of the subframe through respective mounting bushes; In a semi-trailing arm suspension device for a vehicle, which is arranged between the semi-trailing arm and the vehicle body, spring and shock absorbers, A tow variable stage configured between the central rear mounting bracket of the sub-frame and the vehicle body to variably control the tow of the wheel by converting a connection position between the front end of the central rear mounting bracket and the vehicle body according to a control signal of a controller, The toe variable stage is disposed so as to correspond to the front end of the central rear mounting bracket is mounted to the lower portion of the body, the rail block on the cross section in the slide rail in the vehicle width direction; A slider slidably installed on a slide rail of the rail block, the upper surface of the slider being pivotally fastened to the front end of the central rear mounting bracket; A connection link having one end pivoted to a pivot bracket configured at a lower side of the vehicle body opposite to the slider, and the other end pivoted to the slider together with the front end of the central rear mounting bracket; The semi-trailing arm type for a vehicle, which is mounted on the rail block corresponding to both ends of the slider, and is constituted by two side electric actuators which move forward and backward according to a control signal of a controller to slide the slider to both sides. Suspension. delete delete

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