KR101371484B1 - Actuator of active roll control system - Google Patents

Abstract

Disclosed is an actuator for an active roll control system. The actuator for an active roll control system according to an embodiment of the present invention provides a driving force for active roll control by varying a connection position of a stabilizer link, which connects both ends of a stabilizer bar with a suspension arm, on the suspension arm. The actuator for an active roll control system comprises a gear housing; a motor housing that is fastened with a back side of the gear housing with a motor cover interposed; a power transmission that is installed to be slidable in the gear housing, has a screw thread portion formed in an inner circumferential surface of a back end portion, and has a tip end protruding outward; a screw rotating body that is positioned in a central portion of the motor housing with a lead screw integrally connected at the back end at the inner center of a cylindrical rotating tube, the lead screw being engaged with the screw thread portion of the power transmission; a motor unit that is configured between the motor housing and the screw rotating body in the motor housing to drive the screw rotating body to rotate; and brake means that is configured between the inner back of the motor housing and the extended back end of the screw rotating body to regulate the rotation of the screw rotating body.

Description

[0001] ACTUATOR OF ACTIVE ROLL CONTROL SYSTEM [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an actuator for an active roll control device of a vehicle, and more particularly to an actuator for an active roll control device which provides a driving force for enabling active roll control of a stabilizer bar to which both ends of a suspension arm are connected via a stabilizer link, (ARCS: Active Roll Control System).

Generally, the suspension of a vehicle is a device that connects the axle and the vehicle body to prevent damage to the vehicle body and cargo by controlling the vibration or shock that the axle receives from the road surface to be transmitted directly to the vehicle body during traveling.

Such a suspension device includes a chassis spring for relieving an impact from the road surface, a shock absorber for attenuating the free vibration of the chassis spring to improve ride comfort, and a stabilizer bar for suppressing rolling of the vehicle.

Both sides of the stabilizer bar are fixed to the vehicle body, and both ends of the stabilizer bar are fixed to the lower arm or the strut bar through a stabilizer link.

Accordingly, the stabilizer bar does not act when the left and right wheels move up and down at the same time, and when the left and right wheels move relatively up and down relative to each other, the stabilizer bar performs an anti-roll function of suppressing roll of the vehicle body by twisting elastic force .

That is, the stabilizer bar is configured such that when the vehicle is turning, the outer side of the vehicle body is tilted by a centrifugal force, or when the left and right wheels have a relative phase difference due to bump or rebound during traveling, And stabilizes the posture.

However, since the stiffness value of the stabilizer bar is constant and it is insufficient to secure the turning stability under various conditions only by the self-torsional elastic force, recently, an actuator including a hydraulic cylinder or a motor is connected to the tip of the stabilizer bar, An active roll control unit has been developed and applied.

The active roll control device varies the connection point position between the one end of the stabilizer bar and the suspension arm by using an actuator made of a hydraulic cylinder or a motor at a connecting portion of the stabilizer link that connects one end of the suspension arm and the one end of the stabilizer bar So as to change the torsional rigidity of the stabilizer bar.

The connecting portion is connected to each member using a ball joint, so that the connecting portion has a rotational degree of freedom within a certain range.

1 is a partial perspective view of a vehicle suspension device to which a general active roll control device is applied.

Referring to FIG. 1, the active roll control device moves the mounting portion of the stabilizer bar 1 in the direction of increasing the lever ratio according to the driving condition of the vehicle, thereby increasing the roll stiffness value, .

This active roll control device is constituted by an actuator 10 and a sliding unit 4 constituted on a stabilizer bar 1, a stabilizer link 2, and a lower arm 3.

The lower arm 3 is connected between the knuckle 5 and the subframe 6 and both sides of the stabilizer bar 1 are provided on the subframe 5.

The upper end of the stabilizer link 2 is connected to the tip end of the stabilizer bar 1 via a ball joint (BJ).

The actuator 10 is composed of a screw motor or the like and is installed on the subframe 5 and is connected to the lower end of the stabilizer link 2 through a push rod 8.

Here, the push rod 8 and the stabilizer link 2 are connected to each other through the connector 7 guided in the sliding unit 4, and are moved back and forth.

Therefore, the active roll control device described above can be configured such that the actuator 10 is driven in accordance with the running condition of the vehicle to adjust the connecting position on the lower arm 7 of the stabilizer link 2 to vary the lever ratio of the stabilizer link 3, The roll stiffness of the stabilizer bar 1 is changed to actively control the roll stiffness of the vehicle.

That is, in the state in which the connecting position P1 on the lower arm 7 of the stabilizer link 2 is positioned on the vehicle body side before the actuator 10 is operated ("S1" in FIG. 1) ("S2" in Fig. 1), the connection position P2 is adjusted to the wheel side and is held while turning.

However, when the conventional actuator is simply applied to a screw motor or the like, it should not be reversed by the external force F acting on the connecting position P2 on the lower arm 7 of the stabilizer link 2 during operation, (F) acts as a load on the actuator 10, which causes a decrease in durability.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an actuator for an active roll control apparatus having improved durability by providing a brake means not to be reversed by an external force acting on a connecting position on a lower arm of a stabilizer link when an actuator is operated.

It is also desirable to provide an actuator for an active roll control device that can minimize damping by minimizing the effects of vehicle vibration and chipping caused by zig-zag.

In one or more embodiments of the present invention, an actuator for an active roll control apparatus that provides a driving force to actively control a roll by varying a connecting position on a suspension arm of a stabilizer link connecting both ends of the stabilizer bar and a suspension arm A gear housing; A motor housing coupled to a rear side of the gear housing via a motor cover; A power transformer slidably installed in the gear housing and having a screw thread portion formed on an inner peripheral surface of a rear end portion and having a tip protruding outward; A screw rotation body in which a lead screw is integrally connected to the center of an interior of a cylindrical rotary tube and is positioned at a central portion of the motor housing integrally with a rear end thereof and the lead screw is engaged with a screw thread portion of the power transformer; A motor unit disposed between the motor housing and the screw rotating body to rotate the screw rotating body in the motor housing; It is possible to provide an actuator for an active roll control device including a brake means configured between an inner rear of the motor housing and a rear extension end of the screw rotating body to regulate rotation of the screw rotating body.

The gear housing may include a metal bushing disposed on a front inner circumferential surface to reduce frictional force with the power transformer.

The gear housing may include a seal ring which is provided on an inner circumferential surface of the front end portion to seal the space between the gear housing and the power transformer.

In addition, the sealing ring may be supported so as not to be separated by a stop ring installed on the inner peripheral surface of the front end of the gear housing.

The apparatus may further include a sensor unit configured at one side between the gear housing and the power transformer to recognize a home position of the power transformer and output a signal thereof.

In addition, the sensor unit may include a sensing magnet installed on one side of the powertransistor; A Hall sensor installed at a center of the gear housing to sense the sensing magnet and output a signal thereof; It may be configured as a sensor cover mounted to the gear housing to cover the hall sensor.

In addition, the screw rotating body may be interposed between the front end of the rotary tube and the motor cover, and the front and rear ends of the rear end and the motor housing.

The motor unit may include: a motor core installed on an inner circumferential surface of the motor housing; And a permanent magnet provided on an outer circumferential surface of the rotating tube of the screw rotating body.

In addition, the brake means is a brake screw formed on the rear end of the screw rotating body; A plurality of guide pins installed vertically in the motor housing; Upper and lower screw blocks disposed on the upper and lower portions of the brake screw and guided up and down by the guide pins, and screw grooves corresponding to the brake screws are formed on mutually opposite surfaces; It is installed on the upper portion of the motor housing, the rotating shaft may be formed of a brake motor that is formed with a right screw portion and a left screw portion based on the center screwed to the screw holes formed on each side of the upper and lower screw blocks inside the motor housing. have.

In addition, the plurality of guide pins may be formed on both front and rear sides of the brake screw, respectively.

The brake motor may be a servo motor capable of controlling the rotational direction and the rotational speed.

In the embodiment of the present invention, when the actuator is operated, the brake means fixes the screw rotating body to reduce the load on the actuator so as to maintain the durability so that the brake means does not reverse the external force acting on the connecting position on the lower arm of the stabilizer link.

In addition, the durability of the actuator can be preserved by minimizing the influence of vehicle vibration and chipping caused by zigzags.

1 is a partial perspective view of a vehicle suspension device to which a general active roll control device is applied.
2 is a cross-sectional view of an actuator for an active roll control apparatus according to an embodiment of the present invention.
3 is a perspective view of a brake means applied to an actuator for an active roll control device according to an embodiment of the present invention.
4 is an operation diagram of a brake means applied to an actuator for an active roll control apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, for the sake of clarity of explanation of the embodiment of the present invention, parts that are not related to the description are omitted, and the left direction of FIG. 2 is referred to as a front direction and the right direction as a rear direction for convenience of explanation.

FIG. 2 is a cross-sectional view of an actuator for an active roll control apparatus according to an embodiment of the present invention, and FIG. 3 is a perspective view of a brake means applied to an actuator for an active roll control apparatus according to an embodiment of the present invention.

The active roll control device to which the actuator according to the embodiment of the present invention is applied actively improves the rolling behavior of the vehicle by providing a driving force to change the stiffness value of the stabilizer bar according to the driving condition of the vehicle.

2 and 3, an actuator 100 for an active roll control apparatus according to an embodiment of the present invention includes a gear housing 101, a motor housing 103, a power transformer 105, a screw rotating body 107, A motor unit 109, and a brake unit 110.

The gear housing (101) has a space formed therein so that the power transformer (105) can be movably installed therein.

The motor housing 103 constitutes the motor unit 109 and is fastened to the rear side of the gear housing 101 via a motor cover 111. [

The power transformer 105 is slidably installed in the inner space of the gear housing 101 in the forward and backward directions. The inner circumferential surface of the rear end portion of the power transformer 105 is formed with a screw thread portion SN. ) And a spherical ball joint (J) for connection.

Here, the gear housing 101 is provided with a metal bushing 113 on the front inner circumferential surface to reduce frictional force with the power transformer 105.

The gear housing 101 is configured to seal a space between the gear housing 101 and the power transformer 105 by providing a seal ring 115 on the inner peripheral surface of the front end portion of the gear housing 101, The stop ring 117 is supported by the stop ring 117 which is provided at the rear side.

A sensor unit 120 is provided at one side between the gear housing 101 and the power transformer 105 to recognize the home position of the power transformer 105 and output the signal to a controller (not shown).

That is, the sensor unit 120 is provided with a sensing magnet 121 on one side of the power transformer 105, sensing the sensing magnet 121 at one side of the center of the gear housing 101, A hall sensor 123 for outputting the hall sensor 123 is provided.

The hall sensor 123 is protected by a sensor cover 125 mounted on the gear housing 101.

The screw rotating body 107 is formed by integrally connecting a lead screw 133 from the rear end to the inner center of the cylindrical rotary tube 131.

The screw rotation body 107 is positioned at the center of the motor housing 103 and the lead screw 133 is inserted into the inner circumferential space of the power transformer 105 and engaged with the screw thread portion SN.

The motor unit 109 is disposed between the motor housing 103 and the screw rotating body 107 to rotate the screw rotating body 107 inside the motor housing 103.

That is, a motor core 135 is fixed to the inner circumferential surface of the motor housing 103, and a permanent magnet 137 is installed on the outer circumferential surface of the rotary pipe 131 of the screw rotating body 107 .

Here, the screw rotating body 107 is between the front end of the rotary tube 131 and the motor cover 111, and between the front and rear ends of the rear extension end 107a and the motor housing 103, respectively. The bearing B is interposed and rotatably installed.

The brake unit 110 is disposed between the rear of the motor housing 103 and the rear extension 107a of the screw rotating body 107 to regulate the rotation of the screw rotating body 107. [

That is, the brake means 110 is composed of a brake screw 141, a guide pin 143, upper and lower screw blocks (145, 147), the brake motor 149.

The brake screws 141 are formed at the rear extension end 107a of the screw rotating body 107, and four of the guide pins 143 are installed in the motor housing 103 in the vertical direction.

That is, the four guide pins 143 are installed in the motor housing 103 one by one on both front and rear sides of the brake screw 141.

In addition, the upper and lower screw blocks 145 and 147 are disposed on the upper and lower portions of the brake screw 141, respectively, and are guided up and down by the guide pins 143.

The upper and lower screw blocks 145 and 147 are formed with screw grooves (not shown) corresponding to the brake screw 141 on surfaces corresponding to each other.

In addition, the brake motor 149 is installed on the upper portion of the motor housing 103, the rotating shaft is formed of the right screw portion (N1) and the left screw portion (N2) with respect to the center to the upper portion inside the motor housing 103 And screw holes NH formed on one side of the lower screw blocks 145 and 147.

At this time, the brake motor 149 may be made of a servo motor capable of controlling the rotation direction and the rotation speed.

In the actuator 100 for an active roll control apparatus according to the embodiment of the present invention having such a configuration, when the screw rotation body 107 is driven to rotate by the driving of the motor unit 109 in accordance with the running condition of the vehicle, 133) of the stabilizer link 3 (see Fig. 1) is adjusted to the connecting position on the lower arm 7 (see Fig. 1) of the stabilizer link 3 By varying the ratio, the roll stiffness of the vehicle is actively controlled.

In particular, referring to “S1” of FIG. 4, when the vehicle travels straight, the brake motor 149 of the brake unit 110 is driven in the reverse direction to move the upper and lower screw blocks 145 and 147 upward and downward, respectively. The rear extended end 107a of the furnace screw rotating body 107 is maintained in a freely rotatable state.

In this state, when the vehicle is turning, the motor unit 109 is driven to push the connecting position on the lower arm 7 (see Fig. 1) of the stabilizer link 3 (see Fig. 1) toward the wheel side to actively The brake means 110 is driven so as to prevent the motor section 109 from reversing in order to maintain this state while the vehicle is turning.

That is, referring to “S2” in FIG. 4, the brake means 110 includes the brake motor 149 driving forward and the upper and lower screw blocks 145 and 147 moving downward and upper, respectively, and thus the screw rotating body 107. The rotation of the screw rotator 107 is suppressed by being bitten while being engaged with the brake screw 141 formed at the rear extension end 107a.

The screw rotating body 107 is also rotated by the external force F acting as the connecting position P2 (see Fig. 1) on the lower arm 7 (see Fig. 1) of the stabilizer link 2 So that the external force F does not act as a load on the motor unit 109 inside the actuator 100 and the durability of the actuator 100 can be maintained.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

100: actuator 101: gear housing
103: motor housing 105: power transformer
107: screw rotating body 107a: rear extension
109: motor unit 110: brake means
111: motor cover 113: metal bush
115: Sealing ring 117: Stop ring
120: sensor unit 121: sensing magnet
123: Hall sensor 125: Sensor cover
131: Rotary tube 133: Lead screw
SN: screw thread 141: brake screw
143: guide pin 145: upper screw block
147: lower screw block 149: brake motor
N1: Right hand thread N2: Left hand thread

Claims (11)

There is provided an actuator for an active roll control apparatus that varies a connection position on a suspension arm of a stabilizer link connecting both ends of a stabilizer bar and a suspension arm to actively control the roll,
Gear housing;
A motor housing coupled to a rear side of the gear housing via a motor cover;
A power transformer slidably installed in the gear housing and having a screw thread portion formed on an inner peripheral surface of a rear end portion and having a tip protruding outward;
A screw rotation body in which a lead screw is integrally connected to the center of an interior of a cylindrical rotary tube and is positioned at a central portion of the motor housing integrally with a rear end thereof and the lead screw is engaged with a screw thread portion of the power transformer;
A motor unit disposed between the motor housing and the screw rotating body to rotate the screw rotating body in the motor housing;
Brake means configured to restrain the rotation of the screw rotating body between the rear extension end of the screw rotating body inside the rear of the motor housing;
And an actuator for an active roll control device. The method of claim 1,
The gear housing
An actuator for an active roll control device, comprising: a metal bush provided on the front inner circumferential surface to reduce frictional force with the power transformer. The method of claim 1,
The gear housing
Actuator for an active roll control device, characterized in that it comprises a seal ring which is provided on the inner peripheral surface of the front end portion sealing the power transformer. The method of claim 3,
The seal ring
Actuator for an active roll control device characterized in that the support is supported so as not to be separated by the stop ring is installed on the inner peripheral surface of the front end of the gear housing. The method of claim 1,
And a sensor unit configured at one side between the gear housing and the power transformer to recognize a home position of the power transformer and output a signal thereof. 6. The method of claim 5,
The sensor unit
A sensing magnet installed on one side of the powertransfer;
A Hall sensor installed at a center of the gear housing to sense the sensing magnet and output a signal thereof;
A sensor cover mounted on the gear housing and covering the hall sensor;
And an actuator for actuating the actuator. The method of claim 1,
The screw rotating body
An actuator for an active roll control device, characterized in that a bearing is interposed between the front end of the rotary tube and the motor cover and between the front and rear ends of the rear extended end and the motor housing. The method of claim 1,
The motor unit
A motor core installed on an inner circumferential surface of the motor housing;
A permanent magnet provided on an outer circumferential surface of the rotating tube of the screw rotating body;
And an actuator for actuating the actuator. The method of claim 1,
The brake means
A brake screw formed at an extended rear end of the screw rotating body;
A plurality of guide pins installed vertically in the motor housing;
Upper and lower screw blocks disposed on the upper and lower portions of the brake screw and guided up and down by the guide pins, and screw grooves corresponding to the brake screws are formed on mutually opposite surfaces;
A brake motor installed at an upper portion of the motor housing, the rotating shaft having a right screw portion and a left screw portion formed on a center thereof and screwed to a screw hole formed at each side of the upper and lower screw blocks in the motor housing;
And an actuator for actuating the actuator. 10. The method of claim 9,
The plurality of guide pins
Actuators for active roll control device, characterized in that formed on both front and rear sides of the brake screw, respectively. 10. The method of claim 9,
The brake motor
And a servo motor capable of controlling the rotational direction and the number of revolutions of the actuator.

Images