Sliding door drive unit for vehicle

Abstract

A sliding door driving unit for a vehicle is capable of transmitting or blocking a driving force required to pull or push a cable to open or close a sliding door. The sliding door driving unit includes: a worm wheel rotatable by a driving motor; a fixed disk coupled to the output shaft; and a moving disk rotatably mounted between the worm gear and the fixed disk in the axial direction of the output shaft. The moving disk is engaged with the worm gear and selectively engaged with the fixed disk.

Description

Technical Field

[0001] The present invention relates to a sliding door driving unit for a vehicle, and more particularly, to a sliding door driving unit for a vehicle that can transmit or block a driving force required to pull or push a cable to open or close a sliding door. Background Art

[0002] Doors for passengers to get on and off the vehicle are installed on the side of the vehicle.

[0003] like Figures 1 to 3 As shown, a sliding door 2 that slides to open and close is installed on a vehicle 1 such as a van. A track 1a along which the sliding door 2 slides is installed on the body of the vehicle 1. Rollers that travel along the track 1a are installed on the sliding door 2. A door lock that locks the sliding door 2 when the sliding door 2 is closed is installed.

[0004] In recent years, so-called "electric sliding doors" that are opened and closed using the driving force of a driving motor have been increasingly used for the convenience of passengers.

[0005] A driving unit 10 is installed inside the sliding door 2. The driving unit 10 includes a driving motor 12, a first cable 22 and a second cable 23, a first pulley unit 24 and a second pulley unit 25, etc. The first cable 22 and the second cable 23 push or pull the sliding door 2. The pulley switches the directions of the first cable 22 and the second cable 23. The first cable 22 and the second cable 23 are wound on a reel 21 rotated by the driving motor 12. The rotation of the reel 21 winds or unwinds the first cable 22 and the second cable 23, so that the sliding door 2 can slide.

[0006] A clutch (not shown) is provided inside the driving unit 10, which transmits the driving force of the driving motor 12 to the reel 21 or blocks the transmission of the driving force of the driving motor 12 to the reel 21. When the driving motor 12 and the reel 21 are engaged with each other through the clutch, the reel 21 is operated by the driving motor 12, so that the sliding door 2 can be operated in the electric driving mode. When the driving motor 12 and the reel 21 are separated from each other by the clutch, the passenger manually opens or closes the sliding door 2 in the manual mode.

[0007] The position of the clutch is variable by an electromagnet and a spring installed inside the drive unit 10. Therefore, the drive motor 12 and the reel 21 can be engaged or separated with each other. When the driving force is transmitted from the drive motor 12 to the reel 21 through the clutch, the electromagnet makes the clutch contact with the worm gear connected to the drive motor 12. This contact generates friction, making it possible to transmit the driving force. Since the driving force is transmitted by the friction between the clutch and the worm gear, the problem of driving force loss caused by the slip between the clutch and the worm gear occurs.

[0008] In order to provide a solution to this problem, it is necessary to increase the output of the drive motor 12 to compensate for the loss of the driving force, or to increase the friction between the clutch and the worm gear. To this end, it is necessary to increase the strength of the electromagnet, or to increase the contact area between the clutch and the worm gear.

[0009] However, these methods increase the size of the drive unit 10, thereby causing the problem of increased manufacturing cost of the drive unit 10. The increase in the size of the drive unit 10 also increases the size of the space occupied by the drive unit 10 in the sliding door 2, thereby causing an increase in the thickness of the sliding door 2 or interference with other components installed in the sliding door 2.

[0010] Furthermore, even if the output of the drive motor 12, the strength of the electromagnet, and the contact area between the clutch and the worm gear are increased, a loss of driving force between the clutch and the worm gear may still occur over time. Summary of the invention

[0011] The present invention has been made to find a solution to the above-mentioned problem, and its object is to provide a sliding door drive unit for a vehicle capable of providing engagement during fastening to improve the driving force transmission efficiency, thereby reducing the size of the drive unit driving the vehicle sliding door.

[0012] To achieve the above object, according to one aspect of the present invention, a sliding door drive unit for a vehicle is provided. The drive unit includes: a worm wheel that can be rotated by a driving motor; a fixed plate that is coupled to an output shaft; and a moving plate that is rotatably installed between the worm wheel and the fixed plate along the axial direction of the output shaft. The moving plate is engaged with the worm wheel and selectively engaged with the fixed plate.

[0013] In the sliding door drive unit for a vehicle, a receiving groove for receiving a moving disk and inscribed with the periphery of the moving disk may be formed in the worm wheel. The moving disk may slide in the receiving groove toward the axial direction of the output shaft, thereby being engaged with or separated from the fixed disk.

[0014] In a sliding door drive unit for a vehicle, a receiving groove in a worm wheel may be formed with blocking protrusions spaced apart along the circumference of the worm wheel, and the blocking protrusions may protrude toward the rotation center of the worm wheel. A blocking groove may be formed in a moving disk along the circumference of the moving disk, and the blocking protrusions are respectively received in the blocking grooves. The blocking protrusions may be respectively inserted into the blocking grooves, so that the worm wheel and the moving disk are engaged with each other.

[0015] In the sliding door driving unit for a vehicle, support portions may be formed at the periphery of each blocking groove in the moving plate, and the support portions may protrude from the surface of the moving plate by a predetermined height so as to respectively support the blocking protrusions when the blocking protrusions are inserted into the blocking grooves.

[0016] In a sliding door drive unit for a vehicle, one or more engaging protrusions may be formed on a surface of a moving plate, and one or more engaging grooves accommodating the one or more engaging protrusions may be formed in a surface of a fixed plate. The surfaces of the moving plate and the fixed plate face each other.

[0017] In a sliding door drive unit for a vehicle, one or more engagement protrusions may be formed on a surface of a movable plate in a manner of protruding toward a fixed plate. One or more engagement grooves accommodating the one or more engagement protrusions may be formed in the fixed plate. In addition, when the movable plate moves toward the fixed plate, the one or more engagement protrusions may be inserted into the one or more engagement grooves, thereby engaging the movable plate with the fixed plate.

[0018] In the sliding door driving unit for a vehicle, one or more engaging grooves may be formed to be spaced apart by a predetermined angle in a circumferential direction of the moving plate or the fixed plate.

[0019] In the sliding door driving unit for a vehicle, the one or more engaging grooves and the one or more engaging protrusions may be formed in the same number.

[0020] In the sliding door driving unit for a vehicle, an angle at which the one or more engaging protrusions are spaced apart may be set to a multiple of an angle at which the one or more engaging grooves are spaced apart.

[0021] In the sliding door driving unit for a vehicle, a wave spring may be installed between the fixed plate and the moving plate, the wave spring providing elastic support in a direction in which the moving plate is separated from the fixed plate.

[0022] In the sliding door driving unit for a vehicle, an electromagnet may be installed which moves the moving plate in such a manner that the moving plate is engaged with the fixed plate.

[0023] In a sliding door driving unit for a vehicle, a drum may be fastened to an output shaft, and a cable that pulls or pushes the sliding door may be wound around the drum.

[0024] In a sliding door driving unit for a vehicle, when a moving plate is engaged with a fixed plate, the sliding door can be opened or closed by a driving force of a driving motor, and when the moving plate is separated from the fixed plate, the sliding door can be opened or closed manually.

[0025] In the sliding door driving unit for a vehicle, the output shaft may pass through the worm gear without being combined with the worm gear.

[0026] The sliding door drive unit for a vehicle according to the present invention is constructed as described above. In the sliding door drive unit for a vehicle, the moving disk can be engaged with the fixed disk in a state of being engaged with the worm gear. Therefore, the driving force of the driving motor can be transmitted to the cable that pulls or pushes to open or close the sliding door. As a result, the loss of driving force caused by sliding between the moving disk and the fixed disk can be prevented.

[0027] Preventing the loss of driving force between the moving disk and the fixed disk eliminates the need to increase the output of the driving motor to compensate for the loss. In addition, preventing the loss of driving force eliminates the need to increase the strength of the electromagnet that makes the moving disk and the fixed disk closely contact each other.

[0028] Furthermore, the sliding door drive unit can be miniaturized, i.e., smaller than a conventional drive unit. The sliding door drive unit takes up less space inside the sliding door. This eliminates the need to increase the thickness of the sliding door. Furthermore, interference with other components inside the sliding door can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a side view showing a state where a typical sliding door of the related art is installed.

[0030] Figure 2 1 is a schematic diagram showing a configuration in which a driving unit for opening or closing a sliding door is installed inside a typical sliding door of the related art.

[0031] Figure 3 is a perspective view showing a state in which cables are fixed in a typical sliding door of the related art.

[0032] Figure 4 is an exploded perspective view showing a sliding door driving unit for a vehicle according to the present invention.

[0033] Figure 5 1 is a perspective view showing a state in which a cable is wound around a drum inside a sliding door driving unit for a vehicle according to the present invention.

[0034] Figure 6 is a cross-sectional view showing a state in which a driving force is output by a sliding door driving unit for a vehicle according to the present invention.

[0035] Figure 7 is a cross-sectional view showing a state in which a driving force is output in a sliding door using a sliding door driving unit for a vehicle according to the present invention.

[0036] Figure 8 is a partially vertically sectional perspective view showing a state in which a moving plate is engaged with a fixed plate in a sliding door driving unit for a vehicle according to the present invention.

[0037] Fig. 9 It is shown Figure 8 Magnified view of part A.

[0038] Fig.10 is a perspective view showing a coupling relationship between a worm gear and a moving plate in a sliding door driving unit for a vehicle according to the present invention.

[0039] Fig.11 is a plan view showing a state in which a worm gear and a moving plate are coupled to each other in a sliding door driving unit for a vehicle according to the present invention.

[0040] Fig.12 is along Fig.11 The cross-sectional view taken along line II shows a state where the worm wheel and the moving plate are not yet coupled to each other.

[0041] Fig.13 is along Fig.11 A cross-sectional view taken along line II showing a state in which the worm wheel and the moving plate are coupled to each other. DETAILED DESCRIPTION

[0042] Hereinafter, a sliding door driving unit 10 for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

[0043] When one component is referred to as being "connected" or "coupled" to another component, the one component may be directly connected or coupled to the other component, but it should be understood that other components may exist between the two. On the other hand, when one component is referred to as being "directly connected to" or "directly in contact with" another component, it should be understood that no other components exist between the two. Other expressions used to describe the relationship between components, such as "between" and "directly between" or "adjacent" and "directly adjacent", should be interpreted in the same manner.

[0044] When a component, device, element, etc. of the present invention is described as having a purpose or performing an operation, function, etc., the component, device or element should be considered herein as being "configured to" satisfy that purpose or perform that operation or function.

[0045] The sliding door driving unit 10 for a vehicle according to the present invention (hereinafter referred to as "driving unit 10") may include a worm wheel 14, a fixed disk 17, and a moving disk 16. The worm wheel 14 may be rotated by a driving motor 12. The fixed disk 17 may be coupled to an output shaft 15 of the driving unit 10. The moving disk 16 may be installed between the worm wheel 14 and the fixed disk 17 in a slidable manner along the axial direction of the output shaft 15. In addition, the moving disk 16 may preferably always be engaged with the worm wheel 14, and may be selectively engaged with the fixed disk 17.

[0046] In such Figure 1 In the case of the vehicle 1 shown, the sliding door 2 may be installed on the side of the vehicle 1 and opened and closed. A track 1a may be installed on one side of the vehicle 1. A roller arm 2a may be fastened to the sliding door 2. Since a roller (not shown) fastened to the roller arm 2a may slide along the track 1a, the sliding door 2 slides.

[0047] For the convenience of passengers, the sliding door 2 can be opened and closed in an electrically driven manner by the driving force of the driving unit 10. The cables 22 and 23 pulled by the driving unit 10 can be connected to the roller arm 2a using the cable coupling unit 2b. Therefore, the driving unit 10 can pull the cables 22 and 23, so that the roller arm 2a moves. As a result, the sliding door 2 can be opened or closed. The cables 22 and 23 can be respectively provided as the first cable 22 and the second cable 23. The first cable 22 and the second cable 23 can be used to move the sliding door 2 toward the front and rear of the vehicle 1, respectively. The first cable 22 and the second cable 23 can be wound on the reel 21 rotated by the driving unit 10. One of the first cable 22 and the second cable 23 can pull the roller arm 2a along the rotation direction of the reel 21, so that the sliding door 2 can slide in the front and rear direction of the vehicle 1. The pulling direction of the cables 22 and 23 can be changed by the pulley units 24 and 25 each including an internal pulley.

[0048] As described above, the sliding door 2 can slide in the electric drive mode. However, when power is not applied to the drive motor 12, such as when the key is off or the ignition is off, the sliding door 2 may have to slide in the manual mode.

[0049] Therefore, a constituent element for limiting the driving force of the driving motor 12 may be provided inside the driving unit 10. As a result, it is possible to enable the driving unit 10 to be operated in the electric driving mode or the manual mode.

[0050] To this end, the driving unit 10 may include a worm wheel 14, a fixed disk 17, and a moving disk 16. The worm wheel 14 may be rotated by the driving motor 12. The fixed disk 17 may be coupled to the output shaft 15 of the driving unit 10. The moving disk 16 may be installed between the worm wheel 14 and the fixed disk 17 in a slidable manner along the axial direction of the output shaft 15. The moving disk 16 may preferably always be engaged with the worm wheel 14, and may be selectively engaged with the fixed disk 17. Depending on whether the moving disk 16 and the fixed disk 17 are engaged with each other, the driving unit 10 may be operated in an electric drive mode or a manual mode.

[0051] The driving unit 10 may be installed in a space formed by the housing 11 and the cover 11 a .

[0052] The driving motor 12 may be installed at one side of the housing 11. An output shaft of the driving motor 12 may be formed as a worm shaft 13.

[0053] The worm wheel 14 may be rotatably installed inside the housing 11 and may be engaged with the worm shaft 13. Therefore, the worm wheel 14 is rotated by the driving motor 12.

[0054] The movable disk 16 can be installed in a manner that is inscribed in the worm wheel 14. The movable disk 16 can be accommodated in the interior of the worm wheel 14, and the outer periphery of the movable disk 16 can engage with the inner surface of the worm wheel 14. The worm wheel 14 and the movable disk 16 can preferably always engage with each other. A blocking protrusion 14b can be formed on the receiving groove 14a in the worm wheel 14. The blocking protrusion 14b can be formed protrudingly toward the rotation center of the worm wheel 14 in a manner that is spaced apart along the circumference of the worm wheel 14. A blocking groove 16b can be formed along the circumference of the movable disk 16 along the circumference of the movable disk 16, so that the blocking protrusion 14b is respectively accommodated in the blocking groove 16b. Each blocking protrusion 14b can be inserted into each corresponding blocking groove 16b. Therefore, the blocking groove 16b and the blocking protrusion 14b can respectively engage with each other, so that the movable disk 16 is rotated by the worm wheel 14.

[0055] like Fig.10 As shown, in the movable disk 16, a support portion or a raised wall 16c may be formed at the periphery of each blocking groove 16b. The support portion 16c may support the corresponding blocking protrusion 14b. The support portion 16c may be formed at the periphery of the blocking groove 16b in a manner of projecting a predetermined height from the surface of the movable disk 16. The movable disk 16 may move axially along the worm gear 14 in the accommodating groove 14a. Therefore, depending on the position of the movable disk 16, the blocking groove 16b and the blocking protrusion 14b may not be closely engaged with each other. Utilizing the support portion 16c, the blocking groove 16b and the blocking protrusion 14b may be closely engaged with each other regardless of the position of the movable disk 16.

[0056] like Figures 11 to 13 As shown, the moving plate 16 is accommodated in the accommodating groove 14a in the worm wheel 14, so the moving plate 16 can occupy less space required for installation. In addition, the moving plate 16 and the worm wheel 14 are engaged with each other in an internal rather than external manner, so that the moving plate 16 and the worm wheel 14 can be coaxially installed. Therefore, the space required for the installation of the moving plate 16 can also be reduced.

[0057] The fixing plate 17 may be coupled to the output shaft 15 of the driving unit 10 .

[0058] The output shaft 15 may pass through the housing 11 and be coupled to the drum 21. Therefore, when the output shaft 15 rotates, the drum 21 may rotate, thereby pulling the cables 22 and 23. The output shaft 15 may pass through the worm gear 14 without being coupled to the worm gear 14. Therefore, the worm gear 14 may not directly rotate the output shaft 15, but may rotate the output shaft 15 through the moving disk 16 and the fixed disk 17.

[0059] The fixed disk 17 can be selectively engaged with the movable disk 16. When the fixed disk 17 is engaged with the movable disk 16, the driving force of the driving motor 12 can be transmitted to the output shaft 15 through the worm shaft 13, the worm wheel 14, the movable disk 16 and the fixed disk 17.

[0060] An engaging protrusion 16a may be formed on the surface of the movable disk 16, and an engaging groove 17a for accommodating the engaging protrusion 16a may be formed in the surface of the fixed disk 17. The surfaces of the movable disk 16 and the fixed disk 17 may face each other. As a specific example, the engaging protrusion 16a may be formed on the surface of the movable disk 16 in a manner of protruding toward the fixed disk 17. The engaging groove 17a for accommodating the engaging protrusion 16a may be formed in the surface of the fixed disk 17. When the movable disk 16 moves toward the fixed disk 17, the engaging protrusion 16a may be inserted into the engaging groove 17a, so that the movable disk 16 is engaged with the fixed disk 17.

[0061] In another example, a plurality of engagement grooves 17a may be formed in a manner that is spaced apart by a predetermined angle in the circumferential direction of the fixed disk 17. A plurality of engagement protrusions 16a may also be formed in a manner that is spaced apart in the circumferential direction of the movable disk 16. The engagement grooves 17a and the engagement protrusions 16a may be formed in the same number. However, the engagement protrusions 16a may also be formed in a number that is smaller than the engagement grooves 17a. In other words, forming the engagement protrusions 16a in a number that is smaller than the engagement grooves 17a may reduce the time and cost required for machining the engagement protrusions 16a. Figure 8 and Fig. 9 Four engagement grooves 17a and one engagement protrusion 16a are shown. The drive unit 10 operates only when the sliding door 2 is opened and closed. The force applied to the drive unit 10 can be small. For these reasons, even if the engagement protrusions 16a are formed in a number less than the engagement grooves 17a, the driving force of the drive motor 12 can be fully transmitted. When power is applied to the electromagnet 19 described later, the magnetic force generated needs to move the moving disk 16 toward the electromagnet 19. Due to this requirement, the moving disk 16 can be made of a metal material. Therefore, reducing the number of engagement protrusions 16a can reduce manufacturing time and cost.

[0062] However, the angle formed by the intervals of the engagement protrusions 16a can be set to a multiple of the angle formed by the intervals of the engagement grooves 17a. For example, when 40 engagement grooves 17a are formed in the fixed disk 17, the angle formed by the intervals of the engagement protrusions 16a can be a multiple of 9 degrees, such as 9 degrees, 18 degrees, 27 degrees, etc. Therefore, regardless of the respective rotation angles of the movable disk 16 and the fixed disk 17, the movable disk 16 can be in close contact with the fixed disk 17. As a result, the engagement protrusions 16a can be immediately inserted into the engagement grooves 17a, so that the movable disk 16 is engaged with the fixed disk 17.

[0063] In another example, the engaging protrusions 16 a may be formed on the surface of the fixed disk 17 , and the engaging grooves 17 a may be formed in the surface of the moving disk 16 .

[0064] In order to engage or disengage the moving disk 16 with the fixed disk 17 by moving the moving disk 16 toward the output shaft 15 in the worm gear 14, a spring (preferably a wave spring, also called a spiral wave spring or a scrowave spring (hereinafter referred to as a "wave spring")) 18 and an electromagnet 19 may be provided.

[0065] The wave spring 18 can provide elastic support in the direction in which the movable disk 16 is separated from the fixed disk 17. The wave spring 18 can be formed in a ring shape with different heights along the periphery. Therefore, when the wave spring 18 is installed between the fixed disk 17 and the movable disk 16, it can provide elastic support in the direction in which the fixed disk 17 and the movable disk 16 can be separated from each other. In addition, when an external force stronger than its elastic force is applied, the wave spring 18 can be elastically deformed into a flat shape.

[0066] The electromagnet 19 may be positioned at the end of the output shaft 15. The electromagnet 19 may be magnetized when power is applied. The magnetization of the electromagnet 19 may move the moving disk 16, which is a slidable component among the above-mentioned components. When the moving disk 16 is separated from the fixed disk 17 by the wave spring 18, and when the electromagnet 19 is magnetized, the moving disk 16 may be in close contact with the fixed disk 17, so that the moving disk 16 is engaged with the fixed disk 17.

[0067] A spline 15a may be formed on the output shaft 15, and the output shaft 15 may be supported by a bearing 15b. In addition, a damper 15c may be provided on the output shaft 15. When the moving plate 16 is separated from or engaged with the fixed plate 17, the damper 15c may function as a buffer.

[0068] The sliding door driving unit 10 for a vehicle according to the present invention is constructed as described above. Its operation is described as follows.

[0069] Figure 6 1 is a cross-sectional view showing the drive unit 10 operating in a state where power is applied to the electromagnet 19 . Figure 7 is a cross-sectional view showing the drive unit 10 operating in a state where power is not applied to the electromagnet 19 .

[0070] Figure 6 An example is shown in which the drive unit 10 operates in the electric drive mode.

[0071] When the drive unit 10 is operated in the electric drive mode, electric power may be applied to the electromagnet 19. When electric power is applied to the electromagnet 19, the electromagnet 19 may be magnetized. Such magnetization may cause the moving disk 16 to move toward the electromagnet 19. The moving disk 16 may move from the receiving groove 14a in the worm gear 14 toward the axial direction of the output shaft 15. The movement of the moving disk 16 toward the electromagnet 19 may compress the wave spring 18. As a result, the engaging protrusion 16a on the moving disk 16 may be inserted into the engaging groove 17a in the fixed disk 17, so that the moving disk 16 is engaged with the fixed disk 17. Since the moving disk 16 is engaged with the fixed disk 17, the driving force may be transmitted from the moving disk 16 to the fixed disk 17.

[0072] At this time, when power is applied to the drive motor 12, the driving force of the drive motor 12 can be transmitted to the output shaft 15 through the worm shaft 13, the worm wheel 14, the moving disk 16 and the fixed disk 17. Since the reel 21 is fastened to the output shaft 15, the reel 21 can open or close the sliding door 2 by pulling the cables 22 and 23. In order to open or close the sliding door 2, the rotation direction of the drive motor 12 can be switched, so that the sliding door 2 can move forward or backward.

[0073] Figure 7 An example is shown in which the drive unit 10 operates in the manual mode.

[0074] When power is not applied to the electromagnet 19 and thus no magnetic force is generated, the electromagnet 19 does not move the moving disk 16. The wave spring 18 can provide elastic support in a manner that the moving disk 16 can be separated from the fixed disk 17. Therefore, when power is not supplied to the electromagnet 19, the moving disk 16 can be separated from the fixed disk 17. When the moving disk 16 is separated from the fixed disk 17, the fixed disk 17 and the output shaft 15 can be in a state where they can rotate independently of the drive motor 12 or the moving disk 16.

[0075] At this time, when the passenger manually moves the sliding door 2 forward or backward, the cables 22 and 23 may rotate the drum 21 as the sliding door 2 moves, contrary to the electric drive mode. As a result, the output shaft 15 and the fixed disk 17 may rotate. Since the fixed disk 17 is in a state of being separated from the moving disk 16, even when the passenger moves the sliding door 2 forward or backward, the driving unit 10 does not restrict the movement. As a result, the sliding door 2 may move forward or backward according to the passenger's intention.

Claims

1. A sliding door drive unit for a vehicle, the sliding door drive unit comprising: A worm gear, which can be rotated by a drive motor; a fixed plate connected to an output shaft of the sliding door drive unit; as well as A movable plate is rotatably mounted between the worm gear and the fixed plate along the axial direction of the output shaft. The movable plate is engaged with the worm gear and selectively engaged with the fixed plate.

2. The sliding door drive unit according to claim 1, wherein: A receiving groove for receiving the moving disk and inscribed with the periphery of the moving disk is formed in the worm wheel, and The movable disk slides in the accommodating groove toward the axial direction of the output shaft and engages with or separates from the fixed disk.

3. The sliding door drive unit according to claim 2, wherein: On the receiving groove in the worm wheel, blocking protrusions are formed in a manner spaced apart along the circumference of the worm wheel, the blocking protrusions protruding toward the rotation center of the worm wheel; In the moving plate, blocking grooves are formed along the periphery of the moving plate, and the blocking protrusions are respectively accommodated in the blocking grooves; and The blocking protrusions are respectively inserted into the blocking grooves, thereby engaging the worm wheel and the moving disk with each other.

4. The sliding door drive unit according to claim 3, wherein: A support portion is formed at a periphery of each of the blocking grooves in the moving plate, the support portion protruding from a surface of the moving plate by a predetermined height so as to support the blocking protrusion when the blocking protrusion is inserted into the blocking groove.

5. The sliding door drive unit according to claim 1, wherein: One or more engaging protrusions are formed on the surface of the movable plate; One or more engagement grooves for accommodating the one or more engagement protrusions are formed in a surface of the fixed disk; and A surface of the moving plate and a surface of the fixed plate face each other.

6. The sliding door drive unit according to claim 5, wherein: The one or more engaging protrusions are formed on the surface of the moving disk in such a manner as to protrude toward the fixed disk; and When the moving disk moves toward the fixed disk, the one or more engaging protrusions are inserted into the one or more engaging grooves, thereby engaging the moving disk with the fixed disk.

7. The sliding door driving unit according to claim 5, wherein: The one or more engagement grooves are formed to be spaced apart by a predetermined angle in a circumferential direction of the fixing plate.

8. The sliding door driving unit according to claim 5, wherein: The one or more engagement grooves and the one or more engagement protrusions are formed in the same number.

9. The sliding door driving unit according to claim 5, wherein: The angle at which the one or more engagement protrusions are spaced apart is set to be a multiple of the angle at which the one or more engagement grooves are spaced apart.

10. The sliding door driving unit according to claim 1, wherein: A spring is installed between the fixed plate and the movable plate, and the spring provides elastic support in a direction in which the movable plate is separated from the fixed plate.

11. The sliding door driving unit according to claim 1, wherein: An electromagnet is installed, which is capable of moving the moving plate so that the moving plate is engaged with the fixed plate.

12. The sliding door drive unit according to claim 1, wherein: A drum is fastened to the output shaft, and a cable that pulls or pushes the sliding door is wound around the drum.

13. The sliding door drive unit according to claim 12, wherein: When the movable plate is engaged with the fixed plate, the sliding door is opened or closed by the driving force of the driving motor; and When the moving tray is separated from the fixed tray, the sliding door is manually opened or closed.

14. The sliding door drive unit according to claim 1, wherein: The output shaft passes through the worm gear without being combined with the worm gear.

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