KR102566746B1 - Open and close apparatus for a tailgate of vehicle - Google Patents

Abstract

The problem to be solved by the present invention is to prevent the force due to the tailgate's own weight from being transmitted to the motor in the open state of the tailgate, and when the user's external force to close the tailgate acts on the tailgate A vehicle tailgate opening and closing device capable of closing the tailgate is provided.
To this end, an apparatus for opening and closing a tailgate of a vehicle according to the present invention includes a first tube, a second tube movably installed in the first tube in an axial direction, a motor installed in the first tube, and the first tube. A spindle shaft disposed in an inner space formed by the first tube and the second tube, rotated by the driving force of the motor, and having a male screw thread formed on an outer circumferential surface, and a female screw thread disposed in the inner space and screwed with the male screw thread formed on an inner circumferential surface and a moving shaft for moving the second tube in an axial direction when the motor is driven, and a brake unit disposed between the motor and the spindle shaft, wherein the brake unit is coupled to the spindle shaft to It includes a friction shaft that rotates the spindle shaft by a driving force, and a wire ring installed to cover at least a portion of an outer circumferential surface of the friction shaft and rubbed against the friction shaft with a predetermined frictional force.

Description

Tailgate opening and closing device of a vehicle {OPEN AND CLOSE APPARATUS FOR A TAILGATE OF VEHICLE}

The present invention relates to a tailgate opening and closing device for a vehicle, and more particularly, to a tailgate opening and closing device for a vehicle capable of automatically opening and closing the tailgate with a driving force of a motor.

In general, a trunk room, which is a cargo compartment, is provided at the rear of a vehicle, and a tailgate that opens and closes the trunk room is installed.

Conventionally, a passive passive device having a locking device holding the tailgate in a closed state, and configured so that a gas lifter supports the tailgate when the user directly lifts the tailgate by hand after the locking device unlocks the tailgate. An in-tailgate opening and closing device was used.

However, in recent years, a 'power tailgate' has been developed that can automatically open and close the tailgate using the driving force of the motor, and the sensor detects the foot by inserting the foot under the rear of the vehicle while carrying a heavy load. And through this, the motor is operated so that the tailgate can be opened and closed automatically.

International Publication No. WO2017/081277 (May 18, 2017) (hereinafter, referred to as 'prior art') discloses a 'spindle driving device' that is the power tailgate. Here, for the purpose of understanding the prior art, reference numerals will be added to the main components described in the prior art documents, but since these reference numerals are not shown in the drawings of this application, reference to the prior art documents will be sufficient.

In the prior art, the spindle 11 is rotated by the driving force of the motor unit 9a so that the flap 2, which is a tailgate of the vehicle, is automatically opened and closed.

However, it is not a problem for the owner of a vehicle in which the spindle driving device of the prior art is installed because he or she knows the function of the spindle driving device, but for those who do not know the function of the spindle driving device, the flap 2 is open. Attempts can be made to manually close the flap (2). In this way, when an external force to close the flap 2 is applied while the flap 2 is open, the external force is transmitted to the motor unit 9a and the motor unit 9a may be damaged or broken. In the prior art, a brake unit 13 preventing the external force from being transmitted to the motor unit is installed.

That is, in the prior art, when an external force to close the flap 2 acts, as shown in FIG. 2 of the prior art document, the spindle 11 moves downward while being rotated in reverse, and accordingly, the adjusting member 18 As the bottom moves, the spring unit 21 is compressed, and the braking response member 20 rubs against the braking member 19 due to the restoring force of the spring unit 21, so that the component 15 in which the braking member 19 is installed Since reverse rotation is prevented, it is possible to prevent the external force from being transmitted to the motor unit 9a.

However, in the prior art, the adjustment member 18, the spring unit 21, the braking response member 20 and the braking member 19 must be installed to prevent the external force from being transmitted to the motor, so the structure There was a problem that made it complicated.

In addition, in the prior art, since the flap 2 does not close even when the user applies an external force to close the flap 2, there is a problem in that the flap 2 can be opened and closed only by the driving force of the motor.

International Publication No. WO2017/081277 (2017.05.18.)

The problem to be solved by the present invention is to prevent the force due to the tailgate's own weight from being transmitted to the motor in the open state of the tailgate, and when the user's external force to close the tailgate acts on the tailgate It is to provide a tailgate opening and closing device for a vehicle capable of closing the tailgate.

The objects of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a tailgate opening and closing device for a vehicle according to the present invention is composed of a first tube, a second tube, a motor, a spindle shaft, a moving shaft, and a brake unit. The second tube is axially movably installed to the first tube. The motor is installed within the first tube. The spindle shaft is disposed in an inner space formed by the first tube and the second tube. The spindle shaft is rotated by the driving force of the motor. A male thread is formed on the outer circumferential surface of the spindle shaft. The moving axis is disposed in the inner space. A female screw thread screwed to the male screw thread is formed on an inner circumferential surface of the moving shaft. The moving shaft moves the second tube in an axial direction when the motor is driven. The brake unit is disposed between the motor and the spindle shaft. The brake unit is composed of a friction shaft and a wire ring. The friction shaft is coupled to the spindle shaft. The friction shaft rotates the spindle shaft by the driving force of the motor. The wire ring is installed to cover at least a portion of an outer circumferential surface of the friction shaft. The wire ring is rubbed with the friction shaft with a predetermined frictional force.

The predetermined frictional force may be greater than the rotational force of the spindle shaft due to the weight of the tailgate. The predetermined frictional force may be smaller than a rotational force of the spindle shaft due to an external force applied to the tailgate by a user trying to close the tailgate.

A cover may be further configured in the brake unit. The cover may be formed in a tubular shape. The cover may be installed within the first tube. An anti-rotation protrusion for preventing rotation of the wire ring may be formed on an inner circumferential surface of the cover.

One side of the wire ring may be open to form an opening. The anti-rotation protrusion may be inserted into the opening.

A circumferential length of the opening may be longer than a circumferential length of the anti-rotation protrusion.

An insertion groove may be formed on an outer circumferential surface of the friction shaft. The wire ring may be inserted into the insertion groove so as to protrude outward in a radial direction.

An annular installation portion may protrude from an outer circumferential surface of the friction shaft. The annular installation portion may cover an outer circumferential surface of the friction shaft. The insertion groove may be formed in the annular installation part.

Other embodiment specifics are included in the detailed description and drawings.

In the tailgate opening and closing device of a vehicle according to the present invention, when the spindle shaft is about to be rotated by the weight of the tailgate in the open state of the tailgate, the wire ring rubs against the friction shaft to prevent rotation of the spindle shaft. In the open state of the tailgate, there is an effect of preventing the force due to the weight of the tailgate from being transmitted to the motor.

In addition, in the tailgate opening and closing device of a vehicle according to the present invention, when the user applies an external force to the tailgate to close the tailgate in an open state of the tailgate, the spindle shaft controls the frictional force between the friction shaft and the wire ring. Since the tailgate is rotated by winning, when the user's external force to close the tailgate acts on the tailgate in the open state of the tailgate, the tailgate can be closed by the user's external force.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view showing a tailgate opening and closing device of a vehicle according to an embodiment of the present invention;
2 is a side cross-sectional view showing the lower part of the tailgate opening and closing device of the vehicle shown in FIG. 1;
3 is a side cross-sectional view showing an upper portion of the tailgate opening and closing device of the vehicle shown in FIG. 1;
4 is an exploded perspective view specifically showing the brake unit shown in FIG. 2;
5 is a partially cut-away perspective view showing a coupled state of the brake unit shown in FIG. 4;
6 is an exploded perspective view of the brake unit shown in FIG. 5;
7 is a front view illustrating a coupled state of a brake unit included in a tailgate opening and closing device of a vehicle according to an embodiment of the present invention.

Hereinafter, a tailgate opening and closing device of a vehicle according to an embodiment of the present invention will be described with reference to the drawings.

1 is a perspective view showing a tailgate opening and closing device of a vehicle according to an embodiment of the present invention, FIG. 2 is a side cross-sectional view showing a lower portion of the tailgate opening and closing device of a vehicle shown in FIG. 1, and FIG. 3 is a vehicle shown in FIG. 1 It is a side cross-sectional view showing the upper part of the tailgate opening and closing device of

1 to 3, the tailgate opening and closing device 1 of a vehicle according to an embodiment of the present invention is a tailgate door provided at the rear of the vehicle to open and close a trunk room, which is a cargo compartment provided at the rear of the vehicle. As a device capable of automatically opening and closing the gate, two may be provided as a set. That is, of the two tailgate opening/closing devices 1, one of the lower end may be installed on the left side of the body of the trunk room, the upper end may be installed on the left side of the lower surface of the tailgate, and the other lower end may be installed on the trunk. It can be installed on the right side of the car body of the room, and the upper end can be installed on the right side of the bottom of the tailgate.

Hereinafter, only one tailgate opening and closing device 1 will be described as an example, and the tailgate opening and closing device 1 is divided into up and down according to the position of the tailgate opening and closing device 1 when the tailgate is open, and the axial direction is the same as the up and down direction. can be

The tailgate opening and closing device 1 of a vehicle according to an embodiment of the present invention includes a first tube 100, a second tube 200, a motor 300, a spindle shaft 400, a moving shaft 500, and a brake. It may include a unit 600, a guide tube 700, a main spring 800, a body coupling member 900, and a tailgate coupling member 950.

The first tube 100 may be formed in a vertically long cylindrical shape. That is, inside the first tube 100, an internal space having a circular cross section may be vertically formed.

The second tube 200 may also be formed in a vertically long cylindrical shape. That is, an inner space having a circular cross section may be vertically formed inside the second tube 200 as well.

The second tube 200 may be movably installed in the first tube 100 in the axial direction. In this embodiment, it is illustrated that the lower end of the second tube 200 is inserted into the upper end of the first tube 100 so that the second tube 200 is movably installed in the first tube 100 vertically. The upper end of the first tube 100 is inserted into the lower end of the second tube 200, so that the second tube 200 may be movably installed in the first tube 100 vertically.

When the first tube 100 and the second tube 200 are coupled, inside the first tube 100 and the second tube 200, an internal space having a closed and circular cross section is formed vertically and long. can

The lower end of the first tube 100 may be disposed below the lower end of the second tube 200, and the upper end of the second tube 200 may be disposed above the upper end of the first tube 100.

A vehicle body coupling ring 901 may protrude from the lower end of the first tube 100 . The vehicle body coupling ring 901 is rotatably coupled to the vehicle body, so that the tailgate opening/closing device 1 can be supported by the vehicle body when the tailgate is open. In addition, a tailgate coupling ring 951 may protrude from the upper end of the second tube 200 . The tailgate coupling ring 951 is rotatably coupled to the tailgate, so that the tailgate opening/closing device 1 can support the tailgate when the tailgate is open.

Motor 300 may be installed in the first tube (100). The motor 300 may be installed in the lower portion of the first tube 100 . In this embodiment, the inner and outer diameters of the first tube 100 are formed in a constant size from the top to the bottom of the first tube 100, and the inner and outer diameters of the second tube 200 are also of the second tube 200. Although it is illustrated as being formed in a constant size from the top to the bottom, the lower part of the first tube 100 has a larger inner and outer diameter than the upper part, so that the motor 300 is installed in the lower part of the first tube 100. You can also make sure that space is available.

The motor 300 may be a driving source for opening and closing the tailgate. That is, the tailgate opening and closing device 1 of a vehicle according to an embodiment of the present invention can open and close the tailgate by using the driving force of the motor 300 . Specifically, when the rotating shaft of the motor 300 is rotated in one direction, the second tube 200 is moved upward relative to the first tube 100, so that the upper length of the tailgate opening and closing device 1 increases and the tailgate 200 increases. gate can be opened. In addition, when the rotating shaft of the motor 300 is rotated in the other direction, the second tube 200 is moved downward relative to the first tube 100, so that the upper length of the tailgate opening and closing device 1 is reduced while the tailgate gate can be closed.

A reducer 350 may be further installed in the first tube 100 . The reducer 350 may be disposed above the motor 300 within the first tube 100 . Reducer 350 may be formed of a plurality of gear combinations. The input shaft of the reducer 350 may be connected to the rotation shaft 301 of the motor 300, and the output shaft of the reducer 350 may be connected to the friction shaft 610 of the brake unit 600 (see FIGS. 4 to 7). . The reducer 350 may reduce the rotational speed of the rotational shaft 301 of the motor 300 and transmit it to the friction shaft 610 of the brake unit 600 .

The rotation shaft 301 of the motor 300 may protrude upward from the motor 300, and the input shaft of the reduction gear 350 may be disposed below the reduction gear 350 and connected to the rotation shaft 301 of the motor 300. The output shaft of the reducer 350 may be disposed on the upper side of the reducer 350 and connected to the lower end of the friction shaft 610 of the brake unit 600. An upper end of the friction shaft 610 of the brake unit 600 may be connected to a lower end of the spindle shaft 400 . Therefore, when the motor 300 is driven, the spindle shaft 400 can rotate simultaneously with the rotation shaft 301 of the motor 300 .

The spindle shaft 400 may be disposed in an inner space formed by the first tube 100 and the second tube 200 . The spindle shaft 400 may be vertically long. The lower end of the spindle shaft 400 is connected to the friction shaft 610 of the brake unit 600, so that the spindle shaft 400 can be rotated by the driving force of the motor 300.

The moving shaft 500 may be disposed in the inner space formed by the first tube 100 and the second tube 200 . The moving shaft 500 may be vertically long.

An upper part of the spindle shaft 400 may be inserted into a lower part of the moving shaft 500 . The moving shaft 500 may be formed by combining two parts, and the inner and outer parts of the lower part into which the spindle shaft 400 is inserted may be formed of different materials. In this way, since the moving shaft 500 is formed of a different material, it is possible to secure rigidity capable of supporting the tailgate.

The lower part of the spindle shaft 400 may be disposed below the lower part of the moving shaft 500, and the upper part of the moving shaft 500 may be disposed above the upper part of the spindle shaft 400.

A male screw thread may be formed on an outer circumferential surface of the spindle shaft 400, and a female screw thread screwed with the male screw thread may be formed on an inner circumferential surface of the moving shaft 500. As described above, since the spindle shaft 400 and the moving shaft 500 are screwed together, when the motor 300 is driven and the spindle shaft 400 is rotated, the moving shaft 500 is moved in the axial direction and the second The tube 200 can be moved in the axial direction, and through this, the tailgate can be opened and closed.

The brake unit 600 may be disposed between the motor 300 and the spindle shaft 400 .

When a rotational force is applied to the spindle shaft 400 by the weight of the tailgate in a state in which the tailgate is open, the brake unit 600 prevents the rotation of the spindle shaft 400 so that the weight of the tailgate Power can be prevented from being transmitted to the motor 300, and through this, damage and failure of the motor 300 can be prevented.

In addition, when the user applies an external force to the tailgate to close the tailgate while the tailgate is open, the brake unit 600 rotates the spindle shaft 400 so that the user can manually move the tailgate. can be made to close.

The specific configuration of the brake unit 600 will be described later with reference to FIGS. 4 to 7 , and the guide tube 700, the main spring 800, the body coupling member 900, and the tailgate coupling member 950 Let's take a look at it first.

The guide tube 700 may be disposed in the inner space formed by the first tube 100 and the second tube 200 . The guide tube 700 may be formed vertically long. The lower end of the guide tube 700 may be fixed in the first tube 100 .

An inner space having a circular cross section may be vertically formed in the guide tube 700 . The spindle shaft 400 may be inserted into the inner space of the guide tube 700 . A moving shaft 500 may be movably installed in the guide tube 700 in an axial direction.

A lower flange 710 may protrude outward in a radial direction from a lower end of the guide tube 700 . Also, an upper flange 510 may protrude outward in a radial direction from an upper end of the moving shaft 500 . The lower flange 710 and the upper flange 510 may be disposed in the inner space formed by the first tube 100 and the second tube 200 .

A lower end of the moving shaft 500 may be inserted into the guide tube 700 through an upper end of the guide tube 700 .

A portion of the moving shaft 500 disposed below the upper flange 510 may be inserted into the main spring 800 through an upper end of the main spring 800 . Also, a portion of the guide tube 700 disposed above the lower flange 710 may be inserted into the main spring 800 through the lower end of the main spring 800 .

The main spring 800 may be formed in a coil shape. The main spring 800 may be supported by an upper flange 510 and a lower flange 710 . That is, the upper end of the main spring 800 may be supported by the upper flange 510 and the lower end of the main spring 800 may be supported by the lower flange 710 .

The vehicle body coupling member 900 may be installed inside the lower end of the first tube 100 . The vehicle body coupling member 900 may be disposed below the motor 300 within the first tube 100 .

A body coupling ring 901 may be formed on the vehicle body coupling member 900 . The vehicle body coupling ring 901 may protrude from the lower end of the vehicle body coupling member 900 . The vehicle body coupling ring 901 protrudes out of the first tube 100 through a hole formed at the lower end of the first tube 100 and is rotatably coupled to the vehicle body.

The tailgate coupling member 950 may be installed inside the upper end of the second tube 200 . The tailgate coupling member 950 may be disposed above the moving shaft 500 within the second tube 200 .

A tailgate coupling ring 951 may be formed on the tailgate coupling member 950 . The tailgate coupling ring 951 may protrude from the upper end of the tailgate coupling member 950 . The tailgate coupling ring 951 may protrude out of the second tube 200 through a hole formed at an upper end of the second tube 200 and be rotatably coupled to the tailgate.

Meanwhile, when the tailgate is opened and the motor 300 is not driven, when a rotational force is applied to the spindle shaft 400 by the weight of the tailgate, the brake unit 600 rotates the spindle shaft 400. , it is possible to block the transmission of the force due to the weight of the tailgate to the motor 300 . In addition, when the tailgate is opened and the motor 300 is not driven, when the user applies an external force to the tailgate to close the tailgate, the brake unit 600 rotates the spindle shaft 400 to , It is possible to allow the user to manually close the tailgate. Of course, when the motor 300 is driven, the brake unit 600 can rotate the spindle shaft 400 so that the tailgate can be automatically opened and closed by the driving force of the motor 300. A detailed structure of the brake unit 600 enabling such a function will be described below.

4 is an exploded perspective view specifically illustrating the brake unit shown in FIG. 2, FIG. 5 is a partially cut-away perspective view showing a coupled state of the brake unit shown in FIG. 4, FIG. 6 is an exploded perspective view of the brake unit shown in FIG. 5, 7 is a front view illustrating a coupled state of a brake unit included in a tailgate opening and closing device of a vehicle according to an embodiment of the present invention.

Referring to FIGS. 1 to 7 , the brake unit 600 may include a friction shaft 610 , a wire ring 620 and a cover 630 .

The friction shaft 610 may be formed in an axial shape and may be formed of a material with easy friction. The friction shaft 610 may connect the output shaft of the reducer 350 and the lower end of the spindle shaft 400 . That is, the lower end of the friction shaft 610 may be coupled with the output shaft of the reducer 350, and the upper end of the friction shaft 610 may be coupled with the lower end of the spindle shaft 400.

The friction shaft 610 may be coupled to the spindle shaft 400 to rotate the spindle shaft 400 by the driving force of the motor 300 . The friction shaft 610 may rotate simultaneously with the rotation shaft 301 of the motor 300 . When the rotary shaft 301 of the motor 300 is rotated in one direction, the friction shaft 610 may be rotated in one direction, and when the rotation shaft 301 of the motor 300 is rotated in the other direction, the friction shaft 610 is It can be rotated in the other direction.

A wire ring 620 may be installed on an outer circumferential surface of the friction shaft 610 . The wire ring 620 may be installed to cover at least a portion of an outer circumferential surface of the friction shaft 610 . The wire ring 620 may rub against the friction shaft 610 with a predetermined frictional force.

Here, the predetermined frictional force is greater than the rotational force of the spindle shaft 400 due to the weight of the tailgate, and the rotational force of the spindle shaft 400 caused by the user's external force applied to the tailgate to close the tailgate It is preferable to form less than the rotational force. Through this, when a rotational force is applied to the spindle shaft 400 by the weight of the tailgate in a state in which the motor 300 is not driven when the tailgate is opened, the brake unit 600 operates on the spindle shaft 400. By preventing rotation, it is possible to block transmission of force due to the weight of the tailgate to the motor 300 . In addition, when the tailgate is opened and the motor 300 is not driven, when the user applies an external force to the tailgate to close the tailgate, the brake unit 600 rotates the spindle shaft 400 to , It is possible to allow the user to manually close the tailgate.

Of course, since the predetermined frictional force is smaller than the driving force of the motor 300, the brake unit 600 can rotate the spindle shaft 400 when the motor 300 is driven, and through this, the tail The gate may be automatically opened and closed by the driving force of the motor 300 .

The cover 630 may be formed in a tubular shape and installed in the first tube 100 . In this embodiment, since the first tube 100 is formed in a cylindrical shape, the cover 630 may be formed in a cylindrical shape corresponding to the first tube 100 .

Since the brake unit 600 is disposed above the motor 300 and the speed reducer 350 within the first tube 100, the cover 630 covers the motor 300 and the speed reducer 350 within the first tube 100. ) can be placed above. The cover 630 may be fixedly installed within the first tube 100 .

A coupling groove 631 may be formed on the outer circumferential surface of the lower end of the cover 630 . The coupling groove 631 may be formed as a plurality of coupling grooves 631 on the outer circumferential surface of the lower end of the cover 630 . Each of the plurality of coupling grooves 631 extends from the lower end of the cover 630 to the upper end so that the lower end thereof may be opened. In this embodiment, the plurality of coupling grooves 631 may be formed of two coupling grooves 631 disposed opposite to each other in the circumferential direction of the cover 630 .

A coupling protrusion (not shown) may be formed on an inner circumferential surface of the first tube 100 to be inserted into a coupling groove 631 formed in the cover 630 and coupled to the cover 630 . Here, when the coupling protrusion is inserted into the coupling groove 631, the cover 630 may not rotate in the circumferential direction.

A first coupling protrusion 633 may protrude in an axial direction from an upper end of the cover 630 . The first coupling protrusion 633 may be formed of a plurality of first coupling protrusions 633 protruding in an axial direction from an upper end of the cover 630 . In this embodiment, the plurality of first coupling protrusions 633 may be formed of four first coupling protrusions 633 spaced apart from each other in the circumferential direction of the cover 630 . A plurality of first coupling protrusions 633 may be opened at an upper end of the cover 630 . A plurality of coupling protrusions each inserted into the opening formed between the plurality of first coupling protrusions 633 may be formed on the inner circumferential surface of the first tube 100 . Here, when the plurality of coupling protrusions formed on the inner circumferential surface of the first tube 100 are inserted into the openings formed between the plurality of first coupling protrusions 633, the cover 630 will not rotate in the circumferential direction. can

An anti-rotation protrusion 635 preventing rotation of the wire ring 620 may be formed on the inner circumferential surface of the cover 630 .

One side of the wire ring 620 may be opened to form an opening 625 , and the anti-rotation protrusion 635 may be inserted into the opening 625 . Therefore, when the friction shaft 610 is rotated in one direction, the rotation of the wire ring 620 is prevented by contacting one side of the opening 625 with one side of the anti-rotation protrusion 635, so that the friction shaft 610 is wire It may rub against the ring 620.

The length of the opening 625 in the circumferential direction may be longer than the length of the anti-rotation protrusion 635 in the circumferential direction. Therefore, when the rotating shaft 301 of the motor 300 is initially rotated, the wire ring 620 is not caught by the anti-rotation protrusion 635, and the rotating shaft 301 of the motor 300 receives some inertial force. At this time, since the wire ring 620 is caught on the anti-rotation protrusion 635, the load on the motor 300 can be prevented.

An insertion groove 617 into which a wire ring 620 is inserted may be formed on an outer circumferential surface of the friction shaft 610 . The wire ring 620 may be inserted into the insertion groove 617 so as to protrude outward in the radial direction. That is, when the wire ring 620 is inserted into the insertion groove 617, only the vicinity of the inner circumference of the wire ring 620 is inserted into the insertion groove 617, and the vicinity of the outer circumference of the wire ring 620 is inserted into the insertion groove. It may be disposed projecting radially outward from 617.

An annular installation portion 615 surrounding the outer circumferential surface of the friction shaft 610 may protrude from the outer circumferential surface of the friction shaft 610 . The insertion groove 617 may be formed in the annular installation portion 615 . Insertion groove 617 may be formed on the outer side of the annular installation portion 615 in the radial direction.

The driving force of the motor 300 may be input to the friction shaft 610 . The friction shaft 610 is connected to the output shaft of the reducer 350 so that the driving force of the motor 300 can be input.

A second coupling protrusion 611 may protrude from the lower end of the friction shaft 610 in the axial direction. The second coupling protrusion 611 may be formed of a plurality of second coupling protrusions 611 protruding in the axial direction at the lower end of the friction shaft 610 . In this embodiment, the plurality of second coupling protrusions 611 may be formed of two second coupling protrusions 611 disposed opposite to each other in the circumferential direction of the friction shaft 610 . The lower end of the friction shaft 610 may be opened between the plurality of second coupling protrusions 611, and the upper end of the output shaft of the reducer 350 is also formed in a shape corresponding to the lower end of the friction shaft 610, so that the friction shaft The lower end of 610 may be inserted into the opening formed at the upper end of the output shaft of the reducer 350, and the upper end of the output shaft of the reducer 350 may be inserted into the opening formed at the lower end of the friction shaft 610.

A third coupling protrusion 613 may protrude in an axial direction from an upper end of the friction shaft 610 . The third coupling protrusion 613 may be formed of a plurality of third coupling protrusions 613 protruding in an axial direction from an upper end of the friction shaft 610 . In this embodiment, the plurality of third coupling protrusions 613 may be formed of two third coupling protrusions 613 disposed opposite to each other in the circumferential direction of the friction shaft 610 . The upper end of the friction shaft 610 may be opened between the plurality of third coupling protrusions 613, and the lower end of the spindle shaft 400 is also formed in a shape corresponding to the upper end of the friction shaft 610, so that the friction shaft ( 610) may be inserted into the opening formed at the lower end of the spindle shaft 400, and the lower end of the spindle shaft 400 may be inserted into the opening formed at the upper end of the friction shaft 610.

The operation of the tailgate opening and closing device 1 of a vehicle according to the embodiment of the present invention configured as described above will be described as follows.

When the rotary shaft 301 of the motor 300 rotates in one direction, the tailgate can be opened, and when the rotary shaft 301 of the motor 300 rotates in another direction, the tailgate can be closed. That is, when the rotation shaft 301 of the motor 300 is rotated in one direction or the other direction, the friction shaft 610 is also rotated in one direction or the other direction, which is the same direction as the rotation shaft 301 of the motor 300, and the wire ring 620 Since the frictional force of friction with the friction shaft 610 is smaller than the rotational force of the rotational shaft 301 of the motor 300, the frictional shaft 610 is rotated by the rotational force of the rotational shaft 301 of the motor 300 or It is rotated in reverse, and the tailgate can be opened and closed.

Meanwhile, when the tailgate is open, the motor 300 is not driven. In this state, the friction shaft 610 can be rotated in the reverse direction while the spindle shaft 400 is rotated slightly reversely by the weight of the tailgate. At this time, the wire ring 620 is rubbed against the friction shaft 610. . However, since the frictional force of the wire ring 620 rubbing against the friction shaft 610 is greater than the rotational force of the spindle shaft 400 caused by the tailgate's own weight, the friction shaft 610 is prevented from rotating in the reverse direction. Therefore, it is possible to prevent the force due to the weight of the tailgate from being transmitted to the motor 300.

In addition, when the tailgate is open and the motor 300 is not driven, when the user applies an external force to the tailgate to close the tailgate, the spindle shaft 400 reversely rotates and the friction shaft 610 It is rotated in the reverse direction, and at this time, the wire ring 620 is rubbed against the friction shaft 610. However, since the friction force by which the wire ring 620 rubs against the friction shaft 610 is smaller than the rotational force of the spindle shaft 400 due to the external force applied by the user to the tailgate, the friction shaft 610 rotates in the reverse direction Since it is rotated, the tailgate can be closed.

As described above, in the tailgate opening and closing device of a vehicle according to an embodiment of the present invention, when the spindle shaft 400 is to be rotated by the weight of the tailgate in the open state of the tailgate, the wire ring 620 Since rotation of the spindle shaft 400 is prevented by rubbing against the friction shaft 610, it is possible to prevent the force due to the weight of the tailgate from being transmitted to the motor 300 in the open state of the tailgate.

In addition, in the tailgate opening and closing device of a vehicle according to an embodiment of the present invention, when a user applies an external force to the tailgate to close the tailgate in an open state of the tailgate, the spindle shaft 400 moves the friction shaft 610 ) and the frictional force of the wire ring 620, so that when the user's external force to close the tailgate acts on the tailgate in the open state of the tailgate, the tailgate cannot be closed by the user's external force. can

Those skilled in the art to which the present invention pertains will understand that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present invention.

1: vehicle tailgate opening and closing device 100: first tube
200: second tube 300: motor
400: spindle axis 500: moving axis
600: brake unit 610: friction shaft
615: annular installation part 617: insertion groove
620: wiring 625: opening
630: cover 635: anti-rotation protrusion

Claims (7)

first tube;
a second tube movably installed in the first tube in an axial direction;
a motor installed in the first tube;
a spindle shaft disposed in an inner space formed by the first tube and the second tube, rotated by the driving force of the motor, and having a male thread formed on an outer circumferential surface;
a moving shaft disposed in the inner space, having a female screw thread screwed to the male screw thread formed on an inner circumferential surface, and moving the second tube in an axial direction when the motor is driven; and
A brake unit disposed between the motor and the spindle shaft; includes,
The brake unit,
a friction shaft coupled to the spindle shaft and rotating the spindle shaft by the driving force of the motor;
a wire ring installed to cover at least a portion of an outer circumferential surface of the friction shaft and rubbed against the friction shaft with a predetermined frictional force; and
Including; a cylindrical cover installed in the first tube,
One side of the wire ring is open to form an opening,
An anti-rotation protrusion is formed on the inner circumferential surface of the cover to prevent rotation of the wire ring by being inserted into the opening,
An annular installation portion surrounding the outer circumferential surface of the friction shaft protrudes from the outer circumferential surface of the friction shaft,
An insertion groove into which the wire ring is protruded outward in a radial direction is formed on an outer circumferential surface of the annular installation part,
An input shaft is coupled to the rotation shaft of the motor and further includes a reducer including a plurality of gears,
The friction shaft is coupled to the output shaft of the speed reducer and the spindle shaft. The method of claim 1,
The predetermined frictional force is greater than the rotational force of the spindle shaft due to the weight of the tailgate and smaller than the rotational force of the spindle shaft caused by a user's external force applied to the tailgate to close the tailgate. switchgear. delete delete The method of claim 1,
A tailgate opening and closing device of a vehicle, wherein a length of the opening in a circumferential direction is longer than a length of the anti-rotation protrusion in a circumferential direction. delete delete

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