Power swivel device

Abstract

The present invention relates to a power swivel device for a vehicle seat. The power swivel device may comprise: an input part for rotating around a first rotary shaft; an output part having one side coupled to a seat or a seat frame and rotating around the first rotary shaft to be rotatable coaxially with the input part; and a reduction part for reducing the rotational force of the input part and applying the reduced rotational force to the output part, wherein the reduction part comprises: a first power transmission device which receives the firstly reduced rotational force from the input part and rotates around a second rotary shaft; and a second power transmission device which receives the rotational force from the first power transmission device to rotate around a third rotary shaft, and applies the secondarily reduced rotational force to the output part.

Description

Power swivel device

[0001] The present invention relates to a power swivel device, and more specifically, to a power swivel device for a vehicle seat that can achieve a high gear ratio with a simple structure and ensure light weight and strength.

[0002] The present invention relates to project number P0021941, detailed project unique number 1415189597, which was carried out with the support of the Korea Institute for Advancement of Technology with funds from the Ministry of Trade, Industry and Energy.

[0003] A power swivel device, which is generally applied to a vehicle seat and can swivel the seat, may be applied with a drive device of a gear combination that rotates a driven gear formed on the inner or outer diameter surface of a turntable using a drive gear such as a pinion gear.

[0004] These conventional power swivel devices have problems such as the drive gear, motor, or reduction gear box easily breaking down or being damaged because the load or impact applied to the seat is directly transmitted to the drive gear through the rotating plate due to the vehicle's usage environment or the characteristics of the seat.

[0005] In addition, power swivel devices using gear elements such as planetary gears and cycloid have been developed recently to implement high gear ratios, but there have been problems with their high production cost and weight making them difficult to apply to actual mass-produced vehicles.

[0006] The present invention aims to solve various problems, including the above-mentioned problems, by providing a power swivel device that can achieve a high reduction ratio through a simplified gear structure, can be manufactured at low cost, and has a lightweight structure that can firmly support axial loads and reverse rotation loads generated due to the characteristics of the seat. However, these tasks are exemplary and the scope of the present invention is not limited thereby.

[0007] According to the invention for solving the above problem, a power swivel device comprises: an input unit that rotates about a first rotation axis; an output unit that has a sheet or sheet frame coupled to one side and rotates about the first rotation axis so as to be able to rotate coaxially with the input unit; and a reduction unit that reduces the rotational force of the input unit and applies it to the output unit; wherein the reduction unit may include: a first power transmission device that receives a primarily reduced rotational force from the input unit and rotates about a second rotational axis; and a second power transmission device that receives a rotational force from the first power transmission device, rotates about a third rotational axis, and applies a secondarily reduced rotational force to the output unit.

[0008] Additionally, according to the present invention, the second rotation axis may be perpendicular to the first rotation axis, and the third rotation axis may be perpendicular to both the first rotation axis and the second rotation axis.

[0009] In addition, according to the present invention, the input unit may include a rotating body formed in an overall cylindrical shape; and a driving motor unit that supports the rotating body and applies a rotational force so that the rotating body can rotate; and the rotating body may include a body unit; and a first worm gear formed on one side of the body unit.

[0010] In addition, according to the present invention, the output unit may include an output disk formed in an overall ring shape; and a second gear unit formed on one side of the output disk.

[0011] In addition, according to the present invention, the first power transmission device may include a first shaft that rotates about the second rotational axis; and a worm wheel formed on the first shaft and meshed with the first worm gear.

[0012] In addition, according to the present invention, the second power transmission device may include a second shaft that rotates about the third rotational axis and is formed perpendicular to the first shaft; and a second worm gear formed on the second shaft and meshed with the second gear portion.

[0013] In addition, according to the present invention, the reduction unit includes a plurality of screw gear combinations connecting the first power transmission device and the second power transmission device; and the screw threads of the screw gear combinations may be formed in a direction that is not parallel to each other with respect to the first axis or the second axis.

[0014] In addition, according to the present invention, the reduction unit includes a plurality of belt-pulley combinations connecting the first power transmission device and the second power transmission device; and the belts of the belt-pulley combinations facing each other with respect to the first axis or the second axis can be coupled to twist in opposite directions with respect to the direction of the third rotation axis.

[0015] In addition, according to the present invention, a pair of pulleys at positions at a right angle or at an arbitrary angle of the belt-pulley combination can be coupled so that the center of mass is positioned eccentrically with respect to the first rotational axis direction and offset with respect to the first axis or the second axis.

[0016] Additionally, according to the present invention, the first power transmission device may be arranged in pairs with the first gear interposed therebetween.

[0017] Additionally, according to the present invention, the second power transmission device may be arranged in pairs with the second gear interposed therebetween.

[0018] Additionally, according to the present invention, the second rotation axis may be perpendicular to the first rotation axis, and the third rotation axis may be parallel to the second rotation axis.

[0019] In addition, according to the present invention, the first power transmission device may include a first shaft that rotates based on the second rotational axis; and a worm wheel formed on the first shaft and meshed with the first worm gear; and the second power transmission device may include a second shaft that rotates based on the third rotational axis and is formed parallel to the first shaft; and a second worm gear formed on the second shaft and meshed with the second gear portion.

[0020] In addition, according to the present invention, the first axis and the second axis can be arranged to be misaligned by an inter-axis distance based on the vertical direction.

[0021] According to one embodiment of the present invention as described above, there is an effect of being able to firmly support axial load and reverse rotation load occurring due to the characteristics of the seat by a pair of first power transmission devices arranged with an input section interposed therebetween, a pair of second power transmission devices arranged with an output section interposed therebetween, and a plurality of bearings and a power transmission structure arranged therein. Of course, the scope of the present invention is not limited by such an effect.

[0022] Figure 1 is an exploded perspective view of a power swivel device according to one embodiment of the present invention.

[0023] FIG. 2 is a cross-sectional view showing one section of a power swivel device according to one embodiment of the present invention.

[0024] FIG. 3 is a cross-sectional view showing one section of a power swivel device according to another embodiment of the present invention.

[0025] FIG. 4 is a cross-sectional view showing one section of a power swivel device according to another embodiment of the present invention.

[0026] Fig. 5 is a perspective view showing a reduction unit according to one embodiment of the present invention.

[0027] Figure 6 is a front view of a reduction unit according to one embodiment of the present invention.

[0028] Fig. 7 is a front view of a reduction unit according to another embodiment of the present invention.

[0029] Figures 8 and 9 are front views of a reduction unit according to another embodiment of the present invention.

[0030] Fig. 10 is a cross-sectional view showing the first power transmission device of the power swivel device of Fig. 1.

[0031] Fig. 11 is a cross-sectional view showing a second power transmission device of the power swivel device of Fig. 1.

[0032] FIG. 12 is a perspective view showing a power swivel device according to further embodiments of the present invention.

[0033] Fig. 13 is a side cross-sectional view showing the power swivel device of Fig. 12.

[0034] Fig. 14 is a cross-sectional view showing the first power transmission device of the power swivel device of Fig. 12.

[0035] Fig. 15 is a cross-sectional view showing a second power transmission device of the power swivel device of Fig. 12.

[0036] Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0037] The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The following embodiments may be modified in various ways, and the scope of the present invention is not limited to the following embodiments. Rather, these embodiments are provided to more faithfully and completely explain the present disclosure and to fully convey the spirit of the present invention to those skilled in the art. In addition, the thickness and size of each layer in the drawings are exaggerated for convenience and clarity of explanation.

[0038] Hereinafter, embodiments of the present invention will be described with reference to drawings schematically illustrating ideal embodiments of the present invention. In the drawings, variations in the shapes depicted may be expected, for example, depending on manufacturing techniques and / or tolerances. Therefore, embodiments of the present invention should not be construed as limited to the specific shapes of the regions depicted herein, but should include, for example, variations in shapes resulting from manufacturing processes.

[0039] The first rotation axis, the second rotation axis, and the third rotation axis used in this specification may be directions corresponding to the z-axis, y-axis, and x-axis directions illustrated in the drawing, respectively, and are not necessarily limited thereto, but are used to explain the relative positional relationship or movement direction of each member.

[0040] FIG. 1 is an exploded perspective view of a power swivel device (1000) for a vehicle seat according to one embodiment of the present invention.

[0041] As illustrated in FIG. 1, a power swivel device (1000) for a vehicle seat may include an input unit (200) that rotates about a first rotation axis by external power, an output unit (300) that has a seat or a seat frame coupled to one side and rotates about the first rotation axis so as to be able to rotate coaxially with the input unit (200), and a reduction unit (400) that reduces the rotational force of the input unit (200) and applies it to the output unit (300). A cover unit (100) may be coupled to an upper portion of the input unit (200) to accommodate the output unit (300) and the reduction unit (400) therein.

[0042] The above cover part (100), input part (200), output part (300), and reduction part (400) can be laminated and combined based on the z-axis direction to form a power swivel device (1000) for a vehicle seat.

[0043] Fig. 2 is a cross-sectional view showing a section of a power swivel device (1000) for a vehicle seat of the present invention. Here, in order to explain other components, the reduction unit (400) is omitted and only a rough assembly position is shown.

[0044] As illustrated in FIGS. 1 and 2, the input unit (200, see FIG. 1) may include a rotating body (210) formed in an overall cylindrical shape and a driving motor unit (220) that supports the rotating body (210) and applies a rotational force so that the rotating body (210) can rotate.

[0045] Here, the rotating body (210) may include a body portion (211) and a first worm gear (212) formed on one side of the body portion (211).

[0046] The driving motor unit (220) may include a housing (221) formed in a shape in which the center is hollow and a post in the shape of a hollow pipe to which the body unit (211) is fixed is formed protruding from the center.

[0047] In addition, the body part (211) is formed as a hollow pipe shape having a diameter wider than that of the post of the driving motor part (220) as a whole, and is fixed and rotates on the first rotation axis by at least one bearing (230). At this time, the body part (211) can be supported by a double-row bearing structure coupled by the first bearing (231) and the second bearing (232). Although not shown in the drawing, the first bearing (231) and the second bearing (232) can be supported by the step shape of the body part (211) and the housing (221).

[0048] In addition, a plurality of magnets (213) may be arranged along the circumferential direction on the outer surface of the body (211), and coils (222) may be arranged in the housing (221) at a certain distance from the magnets (213) in the diametric direction so as to correspond to each magnet (213). At this time, the winding direction of the coils (222) may be wound in the direction toward the first rotation axis. That is, the driving motor (220) may be a radial magnetic flux type motor.

[0049] In addition, the output unit (300, see FIG. 1) may include an output disk (310, see FIG. 2) formed in an overall ring shape, and a second gear unit (311) formed on one side of the output disk (310). At this time, the output unit (300) may be fixedly supported on a post of the housing (221) by a third bearing (320). Although not shown in the drawing, the above-described bearings may be fixed to the housing (221) by a plurality of snap rings.

[0050] In addition, the cover part (100) may be coupled to one side of the housing (221) of the driving motor part (220) so that the power swivel device (1000) of the vehicle seat forms an overall ring shape. At this time, the cover part (100) may further include a ring-shaped seal part (110) installed on an adjacent surface with the output disk (310) to prevent external foreign substances from entering the interior of the housing (221). For example, the seal part (110) may be a dust seal or an oil seal.

[0051] FIG. 3 is a cross-sectional view showing a section of a power swivel device (2000) for a vehicle seat according to another embodiment of the present invention.

[0052] As illustrated in FIG. 3, the input unit (200) of the power swivel device (2000) for a vehicle seat according to another embodiment of the present invention may be formed with a structure partially identical to that of the power swivel device (1000) for a vehicle seat according to one embodiment, but may include a fourth bearing (233) that connects the body unit (211`) and the output unit (300) so as to support the lower end of the output unit (300). For example, the fourth bearing (233) may be a needle roller bearing. In addition, an end of the body unit (211`) adjacent to the output unit (300) may be formed with a horizontal portion that is horizontal in the diametric direction so that the fourth bearing (233) can be coupled.

[0053] Therefore, according to the power swivel device (2000) of a vehicle seat according to another embodiment of the present invention, the load applied to the swivel core due to the characteristics of the seat can be effectively supported using the first bearing (231), the second bearing (232), the third bearing (320), and the fourth bearing (233).

[0054] FIG. 4 is a cross-sectional view showing a cross-section of a power swivel device (3000) for a vehicle seat according to another embodiment of the present invention.

[0055] As illustrated in FIG. 4, the input unit (200) of the power swivel device (3000) for a vehicle seat according to another embodiment of the present invention is formed to have a structure partially identical to that of the power swivel device (2000) for a vehicle seat according to one embodiment, but a plurality of magnets (213) may be arranged along the circumferential direction on the outer surface of the body portion (211``), and coils (222) are arranged in the housing (221) so as to correspond to each magnet (213) and to be spaced apart from the magnets (213) in the axial direction at a certain interval, and the winding direction of the coils (222) may be wound in a direction parallel to the first rotation axis. That is, the driving motor portion (220) may be an axial flux type electric motor. At this time, a horizontal portion that is horizontal in the diametric direction may be formed on the lower end of the body portion (211``) so that the magnets (213) can be arranged.

[0056] At this time, in order to avoid interference in the process of assembling the body part (211`) to the housing (221) of the drive motor part (220), the body part (211`) may be mounted first and then the coil (222) may be coupled to the housing (221). As another example, it is also possible to avoid interference between the body part (211`) and the coil (222) by forming at least a portion of the housing (221) with a divisible structure.

[0057] In addition, the input unit (200) of the power swivel device (3000) of the vehicle seat may include a fifth bearing (332) installed between the lower end of the body portion (211``) adjacent to the housing (221) and the housing (221) so as to support the vertical load of the body portion (211``). For example, the fifth bearing (332) may be a roller bearing or a needle roller bearing.

[0058] Therefore, according to the power swivel device (3000) for a vehicle seat according to another embodiment of the present invention, not only can the vertical load of the seat be supported more firmly, but also a greater torque can be output with a lighter structure by using an axial flux type electric motor. In addition, although this drawing shows an example of applying an axial flux type electric motor with a stator core applied to one side, an axial flux type electric motor with a double-sided stator core arrangement method or a central stator arrangement method can also be applied depending on the intended use.

[0059] Figure 5 is a perspective view showing a reduction unit (400) according to one embodiment of the present invention.

[0060] As illustrated in FIG. 5, the reduction unit (400) may include a hollow disk-shaped base (410), a first power transmission device (420) installed on the base (410) and receiving a first reduced rotational force from a first worm gear (212, see FIG. 2), and a second power transmission device (430) receiving a rotational force from the first power transmission device (420) and applying a second reduced rotational force to a second gear unit (311).

[0061] More specifically, the first power transmission device (420) may include a first shaft (421) that rotates around a second rotation axis that is perpendicular to the first rotation axis, a worm wheel (422) formed at the center portion of the first shaft (421) and meshed with the first worm gear (212), a first screw gear (423) coupled to an end of the first shaft (421), and a first support member (424) that supports the first shaft (421).

[0062] In addition, the second power transmission device (430) may include a second shaft (431) that rotates about a third rotation axis that is perpendicular to both the first rotation axis and the second rotation axis, a second worm gear (432) formed at the center portion of the second shaft (431) and meshed with a second gear portion (311, see FIG. 2), a second screw gear (433) coupled to an end of the second shaft (431) and meshed with a first screw gear (423), and a second support portion (434) that supports the second shaft (431).

[0063] The second support member (434) is formed to be longer than the first support member (424) with respect to the first rotation axis direction, and can support the second axis (431). Therefore, the first axis (421) and the second axis (431) may not be positioned on the same plane, but may be installed at a position that is perpendicular to each other or at an arbitrary angle.

[0064] At this time, the first power transmission device (420) may include a pair of 1-1 screw gears (423-1) coupled to one end of the first shaft (421) and a 1-2 screw gear (423-2) coupled to the other end of the first shaft (421), with the first worm gear (212) interposed therebetween.

[0065] In addition, the second power transmission device (430) may include a pair of 2-1 screw gears (433-1) that are arranged with the 2nd gear section (311) in between, and are coupled to one end of the 2nd shaft (431) to mesh with the 1-2 screw gear (423-2), and a 2-2 screw gear (433-2) that are coupled to the other end of the 2nd shaft (431) to mesh with the 1-1 screw gear (423-1).

[0066] Accordingly, the input portion (200) of the power swivel device (1000) for a vehicle seat according to one embodiment of the present invention can be firmly supported by a pair of first power transmission devices (420), and the output portion (300) can be firmly supported by a pair of second power transmission devices (430), and can be strongly supported from the reverse rotation applied to the swivel core due to the movement of a seated passenger due to the characteristics of the seat, i.e., from the external force applied from the output portion (300) to the input portion (200).

[0067] Figure 6 is a front view of a reduction unit (400) according to one embodiment of the present invention.

[0068] As illustrated in FIG. 6, the twist directions of the 2-1 screw gear (433-1) and the 2-2 screw gear (433-2) of the 2nd power transmission device (430) can be formed in opposite directions with respect to the 2nd axis (431), and accordingly, the twist directions of the 1-1 screw gear (423-1) and the 1-2 screw gear (423-2) of the 1st power transmission device (420) can be formed in opposite directions with respect to the 1st axis (421).

[0069] This can offset the axial and radial loads generated during driving and external impact, thereby reducing the burden on the axial or radial load of the bearing inside the first or second support member (424, 434) and supporting the input member (200) and output member (300) more firmly.

[0070] Figure 7 is a front view of a reduction unit (400`) according to another embodiment of the present invention.

[0071] As illustrated in FIG. 7, a reduction unit (400`) according to another embodiment of the present invention is formed with a structure partially identical to that of the reduction unit (400) according to one embodiment of the present invention, but the first power transmission device (420`) may include a 1-1 pulley (423`-1) coupled to one end of the first shaft (421) and a 1-2 pulley (423`-2) coupled to the other end, and the second power transmission device (430) may include a 2-1 pulley (433`-1) coupled to one end of the second shaft (431) and connected to the 1-2 pulley (423`-2) by a belt, and a 2-2 pulley (433`-2) coupled to the other end and connected to the 1-1 pulley (423`-1) by a belt.

[0072] At this time, the twist direction of the belt connecting the 1-2 pulley (423`-2) and the 2-1 pulley (433`-1) can be combined to twist in opposite directions based on the twist direction of the belt connecting the 1-1 pulley (423`-1) and the 2-2 pulley (423`-2) and the direction of the third rotation axis.

[0073] Moreover, as illustrated in FIGS. 8 and 9, the first-second pulley (423`-2) and the second-first pulley (433`-1) or the first-first pulley (423`-1) and the second-second pulley (433`-2) can be coupled so that the center of mass is offset and eccentrically positioned with respect to the first rotation axis direction with respect to the first axis (421) or the second axis (422).

[0074] For example, as illustrated in FIG. 8, the 2-1 pulley (433`-1) and the 2-2 pulley (433`-2) can be offset in a direction toward each other along the second axis (431) with respect to the standard alignment position so as to apply tension in a direction toward each other away from each other by the belt, and as illustrated in FIG. 9, the 2-1 pulley (433`-1) and the 2-2 pulley (433`-2) can be offset in a direction toward each other away from each other along the second axis (422) with respect to the standard alignment position so as to apply tension in a direction toward each other toward each other by the belt.

[0075] Accordingly, the axial and radial loads generated when driving each axis of the reduction unit (400) can be offset through the arrangement of the screw gears as described above or the twisting direction of the belt or the eccentric arrangement of the pulley, thereby reducing the burden on the axial or radial load of the bearing inside the first or second support unit (424, 434) and supporting the input unit (200) and output unit (300) more firmly.

[0076] FIG. 10 is a cross-sectional view showing a first power transmission device (420) of the power swivel device (1000) of FIG. 1, and FIG. 11 is a cross-sectional view showing a second power transmission device (430) of the power swivel device (1000) of FIG. 1.

[0077] As illustrated in FIGS. 10 and 11, the operation process of the power swivel device (1000) according to some embodiments of the present invention will be described. First, as illustrated in FIG. 10, when the first worm gear (212) is rotated around the first rotation axis by the driving motor unit (220, see FIG. 1), the worm wheel (422) of the first power transmission device (420) can rotate the first shaft (421) together with the first screw gear (423) around the second rotation axis that is perpendicular to the first rotation axis.

[0078] Next, as illustrated in FIG. 11, when the second screw gear (433) of the second power transmission device (430) is rotated by the first screw gear (423), the second axis (431) is rotated together with the second worm gear (432) around the third rotation axis perpendicular to the second rotation axis, thereby rotating the second gear portion (311), which is a worm wheel gear, so that the seat or seat frame connected thereto can be swivel-rotated.

[0079] Here, the first rotation axis and the second rotation axis are perpendicular to each other, and the first axis (421) of FIG. 10 and the second axis (431) of FIG. 11 are arranged perpendicular to each other so that rotational power can be transmitted evenly through both ends of the first axis (421) and both ends of the second axis (431).

[0080] FIG. 12 is a perspective view showing a power swivel device (4000) according to further embodiments of the present invention.

[0081] As illustrated in FIG. 12, a first power transmission device (420) of a power swivel device (4000) according to further embodiments of the present invention may include a first shaft (421) that rotates about a second rotation axis that is perpendicular to the first rotation axis, a worm wheel (422) formed at a central portion of the first shaft (421) and meshed with a first worm gear (212), and a first screw gear (423) coupled to an end of the first shaft (421).

[0082] In addition, the second power transmission device (430) may include a second shaft (431) that rotates about a third rotation axis that is parallel to the second rotation axis, a second worm gear (432) formed at the center portion of the second shaft (431) and meshed with a second gear portion (311, see FIG. 2), and a second screw gear (433) that is coupled to an end portion of the second shaft (431) and meshed with a first screw gear (423).

[0083] Here, the second rotation axis may be perpendicular to the first rotation axis, and the third rotation axis may be parallel to the second rotation axis.

[0084] Fig. 13 is a side cross-sectional view showing the power swivel device (4000) of Fig. 12.

[0085] As illustrated in FIG. 13, the first shaft (421) of the first power transmission device (420) and the second shaft (431) of the second power transmission device (430) can be arranged to be misaligned by the inter-axle distance (L) in the vertical direction.

[0086] Accordingly, the first axis (421) and the second axis (431) are arranged out of alignment, so that the height of the entire product can be compactly reduced, and the vertical load can be distributed out of alignment, so that the durability and performance of the product can be improved.

[0087] FIG. 14 is a cross-sectional view showing a first power transmission device (420) of the power swivel device (4000) of FIG. 12, and FIG. 15 is a cross-sectional view showing a second power transmission device (430) of the power swivel device (4000) of FIG. 12.

[0088] As illustrated in FIGS. 14 and 15, the operation process of the power swivel device (4000) according to some other embodiments of the present invention will be described. First, as illustrated in FIG. 14, when the first worm gear (212) is rotated around the first rotation axis by the driving motor unit (220, see FIG. 1), the worm wheel (422) of the first power transmission device (420) can rotate the first shaft (421) together with the first screw gear (423) around the second rotation axis that is perpendicular to the first rotation axis.

[0089] Next, as illustrated in FIG. 15, when the second screw gear (433) of the second power transmission device (430) is rotated by the first screw gear (423), the second shaft (431) is rotated together with the second worm gear (432) about the third rotation axis parallel to the second rotation axis, thereby rotating the second gear portion (311), which is a worm wheel gear, so that the seat or seat frame connected thereto can be swivel-rotated.

[0090] Here, the first rotation axis and the second rotation axis are parallel to each other, and the first axis (421) of FIG. 14 and the second axis (431) of FIG. 15 are arranged parallel to each other so that rotational power can be compactly transmitted even in a low space as a whole through one end of the first axis (421) and one end of the second axis (431).

[0091] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. Input unit that rotates around the first rotation axis; An output unit that is coupled to a sheet or sheet frame on one side and rotates about the first rotation axis so as to be able to rotate coaxially with the input unit; and It includes a reduction unit that reduces the rotational force of the input unit and applies it to the output unit; The above reduction gear is, A first power transmission device that receives a first reduced rotational force from the input unit and rotates around a second rotational axis; and A second power transmission device that receives rotational force from the first power transmission device, rotates around a third rotational axis, and applies a secondarily reduced rotational force to the output unit; A power swivel device, including:

2. In paragraph 1, The second rotation axis is perpendicular to the first rotation axis, A power swivel device wherein the third rotation axis is perpendicular to both the first rotation axis and the second rotation axis.

3. In paragraph 2, The above input section, A rotating body formed into an overall cylindrical shape; and It includes a driving motor unit that supports the rotating body and applies a rotational force so that the rotating body can rotate; The above rotating body is, body; and A first worm gear formed on one side of the above body portion; A power swivel device, including:

4. In paragraph 3, The above output section, An output disk formed in a ring shape overall; and A second gear part formed on one side of the above output disk; A power swivel device, including:

5. In paragraph 4, The above first power transmission device is, a first axis rotating about the second rotation axis; and A worm wheel formed on the first axis and meshed with the first worm gear; A power swivel device, including:

6. In paragraph 5, The above second power transmission device, A second axis that rotates around the third rotation axis and is formed perpendicular to the first axis; and A second worm gear formed on the second axis and meshed with the second gear portion; A power swivel device, including:

7. In paragraph 6, The above reduction gear is, A plurality of screw gear combinations connecting the first power transmission device and the second power transmission device; A power swivel device in which the screw threads of the above screw gear combination are formed in a direction that is not parallel to each other with respect to the first axis or the second axis.

8. In paragraph 6, The above reduction gear is, A plurality of belt-pulley combinations connecting the first power transmission device and the second power transmission device; A power swivel device in which the belts of the belt-pulley combination facing each other with respect to the first axis or the second axis are coupled to twist in opposite directions with respect to the direction of the third rotation axis.

9. In paragraph 8, A power swivel device in which a pair of pulleys at positions at a right angle or at an arbitrary angle of the belt-pulley combination are coupled so that the center of mass is eccentrically positioned with respect to the first rotational axis direction and offset with respect to the first axis or the second axis.

10. In paragraph 5, The above first power transmission device is a power swivel device in which a pair is arranged with the first gear in between.

11. In paragraph 6, The above second power transmission device is a power swivel device in which a pair is arranged with the second gear in between.

12. In paragraph 1, The second rotation axis is perpendicular to the first rotation axis, The power swivel device, wherein the third rotation axis is parallel to the second rotation axis.

13. In paragraph 12, The above first power transmission device is, a first axis rotating about the second rotation axis; and A worm wheel formed on the first axis and meshed with the first worm gear; The above second power transmission device, A second axis that rotates around the third rotation axis and is formed parallel to the first axis; and A second worm gear formed on the second axis and meshed with the second gear portion; A power swivel device, including:

14. In paragraph 13, A power swivel device in which the first and second axes are arranged offset from each other by the distance between the axes in the vertical direction.

Images