KR20120061646A - System for increasing force of restoration for rotation of steering wheel fot vehicle - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a steering wheel turning restoring force increasing system of a vehicle to improve the commerciality by increasing the restoring force of a steering wheel while maintaining overall performance of the automobile.
In order to achieve the above object, the present invention provides a steering system in which a tie rod drawn to both sides of a steering gear box is connected to a knuckle arm of a steering knuckle rotatably supporting a steering wheel, wherein the tie rod and the knuckle arm are connected to each other. A steering wheel turning restoring force increase system of a vehicle formed by arranging a connecting position variable device capable of variably changing the connecting position in the longitudinal direction of a knuckle arm.

Description

Steering wheel turning resilience increase system of car {SYSTEM FOR INCREASING FORCE OF RESTORATION FOR ROTATION OF STEERING WHEEL FOT VEHICLE}

The present invention relates to a steering wheel turning restoring force increase system of an automobile, and more particularly, to increase steering wheel turning restoring force of a vehicle to increase the restoring force of a steering wheel while maintaining overall performance of the automobile. It's about the system.

The steering system in an automobile is configured to move a steering wheel while moving in an axial direction by a steering shaft that rotates in response to a steering wheel disposed in a driver's seat, a rotary valve connected to the steering shaft, and hydraulic pressure supplied from the rotary valve. It is configured with a gearbox that operates directly.

In such a steering system, a general connection configuration of the gearbox and the steering wheel is illustrated. As shown in FIG. 1, left and right tie rods 4 and 6 which are pulled out to both sides of the gearbox 2 are steered with the steering wheel 8. It is connected to the knuckle arms 16 and 18 which protrude to a predetermined length to the rear of the steering knuckles 12 and 14 which rotatably support the " 10 ".

In the above, the left and right tie rods (4) and (6) are connected to both ends of the rack bar built in the gear box (2) via a separate joint, the left and right tie rods (4) and (6) It is connected to the knuckle arms 16 and 18 via a rotatable connecting member such as a joint.

Accordingly, when the steering wheel is rotated as necessary, the rack bar moves left and right by hydraulic pressure supplied from the rotary valve, thereby changing steering knuckles 12 and 14 to steer.

However, in the related art, the tie rods 4 and 6 and the knuckle arms 16 and 18 are connected to each other through a connection member such as a ball joint. It is implicated.

In more detail, in FIG. 2, a left turn is shown as an example. In the process of restoring to a straight state after steering, the turning inner ring 8 has a slip angle of [+] because the turning radius is small, and the [+ The non-restored moment (-M) is generated by the reverse lateral force (-F) acting on the slip angle of].

And since the turning radius of the turning outer ring 10 is large, it has a slip angle of [-], and the lateral force F acts by the slip angle of [-], and a restoring moment M is generated.

As described above, the restoring moment M generated in the turning outer ring 10 is divided into the effective arms e to generate the restoring thrust in the rack bar of the gearbox, but in the case of the turning inner ring 8, the restoring moment ( -M) is divided into the effective arms (e) to generate a non-restored thrust on the rack bar of the gearbox, thereby impairing the problem of resilience.

In the above description, the effective arm (e) means a virtual arm formed by the distance between the virtual line and the kingpin axis vertical point when the virtual line orthogonal to the longitudinal extension line of the tie rod is connected with the vertical point of the kingpin axis. do.

In view of this, the present inventors focused on increasing the length of the effective arm in the case of the turning inner ring and reducing the length of the effective arm in the case of the opposite inner turning inner ring. Provided.

Accordingly, an object of the present invention is to provide a steering wheel turning restoring force increase system of a vehicle to improve the commerciality by increasing the restoring force of the steering wheel while maintaining the overall performance of the car.

In order to achieve the above object, the present invention provides a steering system in which a tie rod drawn to both sides of a steering gear box is connected to a knuckle arm of a steering knuckle rotatably supporting a steering wheel, wherein the tie rod and the knuckle arm are connected to each other. A steering wheel turning restoring force increase system of a vehicle formed by arranging a connecting position variable device capable of variably changing the connecting position in the longitudinal direction of a knuckle arm.

Wherein the variable connection position device is characterized in that to move the position of the connecting portion of the turning inner ring to the rear side during the restoration of the turning, and to move the position of the connecting portion of the turning outer ring to the front side.

In the above connection variable position device and the long hole is formed in the longitudinal direction in the knuckle arm; A ball joint fixed to the outer end of the tie rod and slidably fixed back and forth within the long hole; An actuator fixed to the knuckle arm to move the ball joint forward and backward; And an electronic control unit for controlling the actuator according to a signal input from a steering angle and a vehicle speed sensor.

The actuator is characterized in that formed with a linear motor.

According to the above configuration, the present invention increases the effective arm length by moving the connecting position of the turning inner ring to the rear side at the time of restoring the turning at low speed, and moving the connecting portion position of the turning outer ring to the front side as shown by the dotted line to increase the length of the effective arm. It is configured to be shortened.

Accordingly, by increasing the effective arm of the turning inner ring to which the non-resilient moment acts and shortening the effective arm of the turning outer ring to which the restoring moment acts, the thrust is increased in the rack bar in the restoring direction, thereby improving the restoring force. .

In addition, the present invention additionally arranges the connection position variable device that can variably change the connection position in the longitudinal direction of the knuckle arm at the connection portion of the tie rod and the knuckle arm, thereby having no effect on the platen performance of the existing vehicle.

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 schematic plan view of a conventional steering system.
2 is a view for explaining a conventional problem.
3 is a schematic plan view of a steering system to which the present invention is applied.
Figure 4 is a view for explaining the effect of the present invention.
5 is a configuration diagram of a variable connection position apparatus applied to 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. 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 illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

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

3 is a schematic plan view of a steering system to which the present invention is applied, in which tie rods 102 and 104 which are pulled out on both sides of a steering gear box 100 rotatably support steering wheels 106 and 108. Is connected to the knuckle arms 114 and 116 protruding at a predetermined length to the rear of the steering knuckles 110 and 112.

In the above, the left and right tie rods 102 and 104 are connected via separate joints at both ends of a rack bar not shown in the gear box 100, and the tie rods 102 and 104 are connected to the ball. It is connected to the knuckle arms 114 and 116 through a connecting member which can be rotatably connected such as a joint.

Accordingly, when the steering wheel is rotated as necessary, the rack bars are moved left and right by hydraulic pressure supplied from a known rotary valve, and the steering knuckles 110 and 112 are oriented through the tie rods 102 and 104. By changing the steering is achieved.

In this steering system, the present invention can vary the connection position of the tie rods 102, 104 and knuckle arms 114, 116 in the longitudinal direction of the knuckle arms 114, 116. It is made by arranging the connection position variable device 118, 120 which can be.

That is, in the case of the turning inner ring 106, the connecting position variable device 118, 120 moves the position of the connecting portion 122 to the dashed line and the rear side at the time of restoring the turning at low speed, as shown in FIG. ), And the turning outer ring 108 is configured to shorten the length of the effective arm (e) by moving the position of the connecting portion 124 to the front side like a dotted line.

As described above, the effective arm e of the turning inner ring 106 to which the non-restored moment (-M) acts at the time of low speed turning restoration increases, and the effective arm of the turning outer ring 108 to which the restoring moment M acts ( By shortening e), the thrust force is increased in the rack bar in the restoring direction, so that the restoring force can be improved.

FIG. 5 is a diagram illustrating an example of the connection position variable device 118 and 120 as described above, and illustrates the connection position variable device 120 applied to the turning outer ring 108 for convenience of description.

That is, the long hole 130 is formed in the longitudinal direction of the knuckle arm 116, and the ball joint 132 for forming the connecting portion 124 in the long hole 130 is slidably fixed, and the ball joint 130 ) Connects its ball joint 132 with an actuator 134 that can move back and forth within the long hole 130, the actuator 134 being fixed on the knuckle arm 116.

The actuator 134 is to use a linear motor, there are a number of types of the linear motor, but is not limited to any kind, it is possible to move the ball joint 130 accurately in the long hole 130 as necessary If there is, we are satisfied.

The actuator 134 is controlled by an electronic control unit (ECU), and the electronic control unit (ECU) is the actuator 134 by a signal input by the steering angle sensor 136 and the vehicle speed sensor 138. To control.

That is, the electronic control unit (ECU) detects a signal input from the steering angle sensor 136 and the vehicle speed sensor 138, and when the vehicle speed is less than or equal to the set speed, the connection part according to the signal input from the steering angle sensor 136. By controlling the actuator 134 by calculating the movement amount of the 124, it is possible to control the length of the effective arm e, thereby improving only the resilience while maintaining the overall performance of the vehicle.

And because it operates at a low speed, and can move the position of the connection portion 122, 124 without applying a large force it is possible to apply a small capacity motor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

100 ... Steering Gearbox 102,104 ... Tie Rod
106,108 ... Steering wheel 110,112 ... Steering knuckle
114,116 ... knuckle arm 118,120 ...
122,124 ... Connection 130 ... Longines
132 ... ball joint 134 ... actuator
136 ... steering angle sensor 138 ... vehicle speed sensor

Claims (4)

In a steering system in which a tie rod drawn to both sides of a steering gear box is connected to a knuckle arm of a steering knuckle rotatably supporting a steering wheel,
And a connection position variable device capable of variably changing the connection position in the longitudinal direction of the knuckle arm at the connection portion of the tie rod and the knuckle arm. The method of claim 1,
The link position variable
A steering wheel turning restoring force increase system for a vehicle, characterized in that the position of the connecting portion of the turning inner ring can be moved to the rear side and the position of the connecting portion of the turning outer ring can be moved to the front side when the turning is restored. The method of claim 1,
The link position variable
A long hole formed in the longitudinal direction in the knuckle arm;
A ball joint fixed to the outer end of the tie rod and slidably fixed back and forth within the long hole;
An actuator fixed to the knuckle arm to move the ball joint forward and backward;
And an electronic control unit for controlling the actuator according to a signal input from a steering angle and a vehicle speed sensor. The method of claim 3,
Actuator is
Steering wheel turning reinforcement system of a vehicle characterized by the use of a linear motor.

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