Double-shaft rotating structure

Abstract

The double-shaft rotating structure is provided with a first rotating shaft and a second rotating shaft, the first rotating shaft is connected with the second rotating shaft in a relative rotating mode, a torsion structure is arranged between the first rotating shaft and the second rotating shaft, the torsion structure is provided with a first cam piece, and the first cam piece and the first rotating shaft are coaxially arranged. One end face of a first pushing and abutting piece abuts against the first cam piece, the other end face of the first pushing and abutting piece abuts against one end of an elastic piece, and therefore when the first rotating shaft and the first cam piece rotate synchronously, the elastic piece can be compressed, and meanwhile the rotating torsion of the first rotating shaft is changed.

Description

Technical Field

[0001] The utility model relates to a hinge, in particular to a double-axis rotating structure of a foldable electronic device. Background Art

[0002] Currently, common flip-top or foldable electronic devices have a display unit that can also perform touch input operations in addition to the original keyboard input unit. Due to this change in operation mode, the existing electronic devices can, in addition to the original usage mode, flip the touch screen or flexible screen to 360 degrees through a dual-axis co-moving structure, so that the touch screen and the back of the keyboard input unit or the back of the flexible screen are relatively overlapped for separate use.

[0003] In the previous structure, a torque member is usually set on a rotating shaft to generate torque, so that the rotating shaft can rotate stably and stop at a rotation angle. As shown in the "rotating shaft structure" of Taiwan Patent No. TWM611226, a double rotating shaft structure is disclosed, which mainly includes a rotating shaft, a sleeve, an elastic member and an adjustment member. The rotating shaft is rotatably set on the sleeve, the sleeve has a conical surface, the elastic member is sleeved on the conical surface, and the adjustment member is movably coupled to the rotating shaft and has a conical hole. The adjustment member is movably set on the elastic member through the conical hole. In one mode, the adjustment member covers the entire elastic member, the entire elastic member is located between the conical hole and the conical surface, and the entire elastic member is squeezed to provide a first torque, while in another mode, the rotating shaft is rotated, the adjustment member is moved by the rotating shaft, a part of the elastic member is located between the conical hole and the conical surface, and at least a part of the elastic member is not squeezed to provide a second torque.

[0004] The "tiltable and retractable 360-degree dual-axis synchronous damping rotating shaft" with patent number CN205064574U provides another dual-axis structure, which mainly includes two shaft cores, two worm wheels, a worm and at least two limit connecting plates. One worm wheel is fixed on one shaft core, and the other worm wheel is fixed on the other shaft core. The two limit connecting plates are both mounted on the two shaft cores and located on both sides of the two worm wheels, so that the two shaft cores are radially spaced at a set distance and can rotate freely circumferentially relative to the two limit connecting plates; the worm is arranged in a receiving space surrounded by two limit connecting plates and two worm wheels, and the two sides of the worm are respectively engaged with the two worm wheels; and through a number of butterfly springs, gaskets and nuts, the function of tight fitting and positioning is realized through locking nuts, and then torque is provided through butterfly springs.

[0005] However, in the past, a torsion member such as an elastic member or a butterfly spring is disposed on a rotating shaft. Due to structural limitations, it can only generate a fixed torque, but cannot achieve a change in torque at a specific angle or provide a larger torque value. Utility Model Content

[0006] In view of this, in order to provide a structure different from the prior art and improve the above-mentioned shortcomings, the creators have accumulated many years of experience and continuous research and development and improvement, thus resulting in the production of the present utility model.

[0007] One purpose of the utility model is to provide a dual-axis rotation structure, so as to solve the problem that the torque member of the conventional dual-axis structure is arranged on the rotating shaft and can only generate a fixed torque, but cannot achieve a change in torque at a specific angle or provide a larger torque value. In order to achieve the above-mentioned purpose of the utility model, the dual-axis rotation structure provided by the utility model includes a first rotating shaft and a second rotating shaft, the first rotating shaft is connected to the second rotating shaft in a relatively rotating manner, and a torque structure is arranged between the first rotating shaft and the second rotating shaft. The torque structure includes a first cam member, a first push-and-resistance sheet and an elastic member, wherein the first cam member is arranged coaxially with the first rotating shaft, one end face of the first push-and-resistance sheet presses against the first cam member, and the other end face of the first push-and-resistance sheet presses against one end of the elastic member, so that when the first rotating shaft and the first cam member rotate synchronously, the elastic member can be compressed and the rotation torque of the first rotating shaft can be changed.

[0008] During implementation, the torsion structure includes a first elongated limiting plate and a second elongated limiting plate parallel to each other, the first elongated limiting plate having a first hole, a first limiting portion and a second hole arranged in the length direction, one end of the first rotating shaft is penetrated by the first hole, and one end of the second rotating shaft is penetrated by the second hole; the second elongated limiting plate has a first axial hole, a second limiting portion and a second axial hole arranged in the length direction, the other end of the first rotating shaft is penetrated by the first axial hole, and the other end of the second rotating shaft is penetrated by the second axial hole; one end of the first pushing piece has a first sliding portion, the first sliding portion is connected to the first limiting portion in a relatively movable manner, and the other end of the first pushing piece has a second sliding portion, the second sliding portion is connected to the second limiting portion in a relatively movable manner.

[0009] During implementation, the first cam member has a first sleeve, the outer periphery of the first sleeve has a first plane portion and a first arc convex portion, the first plane portion presses against an end surface of the first push piece, and the first arc convex portion extends outward from one side of the first plane portion in a gradually expanding manner.

[0010] During implementation, the torque structure also includes a second cam member and a second push plate. The second cam member is coaxially arranged with the second rotating shaft. One end face of the second push plate presses against the second cam member, and the other end face of the second push plate presses against the other end of the elastic member, so that when the second rotating shaft and the second cam member rotate synchronously, the elastic member can be compressed and the rotational torque of the second rotating shaft can be changed.

[0011] During implementation, the torsion structure includes a first elongated limiting plate and a second elongated limiting plate parallel to each other, the first elongated limiting plate having a first hole, a first limiting portion and a second hole arranged in the length direction, one end of the first rotating shaft is penetrated by the first hole, and one end of the second rotating shaft is penetrated by the second hole; the second elongated limiting plate has a first axial hole, a second limiting portion and a second axial hole arranged in the length direction, the other end of the first rotating shaft is penetrated by the first axial hole, and the other end of the second rotating shaft is penetrated by the second axial hole; one end of the second push plate has a third sliding portion, the third sliding portion is connected to the first limiting portion in a relatively movable manner, and the other end of the second push plate has a fourth sliding portion, the fourth sliding portion is connected to the second limiting portion in a relatively movable manner.

[0012] During implementation, the second cam member has a second sleeve, the outer periphery of the second sleeve has a second plane portion and a second arc convex portion, the second plane portion presses against an end surface of the second push piece, and the second arc convex portion extends outward from one side of the second plane portion in a gradually expanding manner.

[0013] During implementation, the other end surface of the second push piece has a second protrusion, the outer periphery of the second protrusion has a coaxial second annular groove, the elastic member is sleeved on the second protrusion, and the other end of the elastic member is limited in the second annular groove.

[0014] During implementation, the other end surface of the first push piece has a first protrusion, the outer periphery of the first protrusion has a coaxial first annular groove, the first protrusion is sleeved with the second protrusion in a relatively telescopic manner, and one end of the elastic member is limited in the first annular groove.

[0015] In implementation, the elastic member includes a plurality of coaxially stacked annular elastic sheets.

[0016] During implementation, a first gear is coaxially arranged at one end of the first rotating shaft, a second gear is coaxially arranged at one end of the second rotating shaft, and an intermediate gear set is gear-connected with the first gear and the second gear.

[0017] The beneficial effects of the utility model are:

[0018] A torque structure is added between the two rotating shafts, and a cam member on one rotating shaft of the torque structure presses against a push plate, so that the elastic member can be compressed when the rotating shaft rotates, thereby providing a torque change of the rotating shaft within a specific angle range, or providing a larger torque value on the basis of the original torque component, thereby meeting different needs and being flexibly applied to different products.

[0019] In order to facilitate a deeper understanding of the present invention, it is described in detail below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded view of components of a preferred embodiment of the utility model;

[0021] Figure 2 This is an exploded view of the components of the torsion structure of the preferred embodiment of the utility model;

[0022] Figure 3 A three-dimensional schematic diagram of the preferred embodiment of the utility model;

[0023] Figure 4 for Figure 3 A-A' section diagram;

[0024] Figure 5 It is an exploded view of components when the elastic member of the torsion structure of the utility model is another embodiment;

[0025] Figure 6 This is a schematic diagram of the use state of the first rotating shaft and the second rotating shaft of the utility model when they are relatively flipped to 180 degrees;

[0026] Figure 7 This is a schematic diagram of the use state of the first rotating shaft and the second rotating shaft of the utility model when they are relatively turned to 360 degrees;

[0027] Description of Reference Numerals

[0028] 1. Double-axis rotation structure;

[0029] 2. A first elongated limiting plate;

[0030] 21. First side;

[0031] 22. Second side;

[0032] 23. Long positioning plate;

[0033] 231, positioning hole;

[0034] 24. The first hole;

[0035] 25. A first limiting portion;

[0036] 26. Second hole;

[0037] 3. The second long limiting plate;

[0038] 31. First axial hole;

[0039] 32. A second limiting portion;

[0040] 33. Second shaft hole;

[0041] 4. The first rotating shaft;

[0042] 41. First gear;

[0043] 42. A first connecting member;

[0044] 43. a first elastic sheet;

[0045] 44. First nut;

[0046] 5. Second rotating shaft;

[0047] 51, second gear;

[0048] 52. Intermediate gear set;

[0049] 53. Synchronous gear set;

[0050] 54. A second connecting member;

[0051] 55. a second elastic sheet;

[0052] 56. Second nut;

[0053] 6. Torsion structure;

[0054] 61. a first cam member;

[0055] 611, first sleeve;

[0056] 612, first plane portion;

[0057] 613, first arc convex part;

[0058] 62. First push piece;

[0059] 621, first sliding portion;

[0060] 622, second sliding portion;

[0061] 623, first protrusion;

[0062] 624, first annular groove;

[0063] 63. Elastic parts;

[0064] 631, annular shrapnel;

[0065] 64. a second cam member;

[0066] 641, second sleeve;

[0067] 642, second plane portion;

[0068] 643, second arc convex part;

[0069] 65. Second push piece;

[0070] 651, third sliding part;

[0071] 652, fourth sliding portion;

[0072] 653, second protrusion;

[0073] 654. Second annular groove. DETAILED DESCRIPTION

[0074] The double-axis rotation structure of the utility model comprises a first rotating shaft 4 and a second rotating shaft 5, wherein the first rotating shaft 4 is connected to the second rotating shaft 5 in a relatively rotating manner. A torsion structure 6 is arranged between the first rotating shaft 4 and the second rotating shaft 5, wherein the torsion structure 6 comprises a first cam member 61, a first push-and-resistance sheet 62 and an elastic member 63, wherein the first cam member 61 is coaxially arranged with the first rotating shaft 4; one end face of the first push-and-resistance sheet 62 presses against the first cam member 61, and the other end face of the first push-and-resistance sheet 62 presses against one end of the elastic member 63, so that when the first rotating shaft 4 and the first cam member 61 rotate synchronously, the rotation torque of the first rotating shaft 4 can be changed by compressing the elastic member 63. During implementation, the torque structure may also include a second cam member 64 and a second push plate 65, wherein the second cam member 64 is coaxially arranged with the second rotating shaft 5, one end face of the second push plate 65 presses against the second cam member 64, and the other end face of the second push plate 65 presses against the other end of the elastic member 63, so that when the second rotating shaft 5 and the second cam member 64 rotate synchronously, the rotational torque of the second rotating shaft 5 can be changed by compressing the elastic member 63.

[0075] See also Figure 1~Figure 4 As shown, it is a preferred embodiment of the dual-axis rotation structure 1 of the utility model, including a first elongated limiting plate 2, a second elongated limiting plate 3, a first rotating shaft 4, a second rotating shaft 5 and a torsion structure 6. The first elongated limiting plate 2 has a first side surface 21 and a second side surface 22 in opposite directions, the first side surface 21 is adjacent to an elongated positioning plate 23, and the elongated positioning plate 23 has a plurality of positioning holes 231 on its long-direction plate surface; the first elongated limiting plate 2 has a first hole 24, an elongated through groove and a second hole 26 arranged in the long direction on its plate surface, and the elongated through groove serves as the first limiting portion 25. The second elongated limiting plate 3 is parallel to the first elongated limiting plate 2, and there is a spacing between the second elongated limiting plate 3 and the second side surface 22 of the first elongated limiting plate 2. The second elongated limiting plate 3 has a first shaft hole 31, an elongated groove and a second shaft hole 33 arranged in the long direction on its plate surface, and the elongated groove serves as the second limiting portion 32.

[0076] A first gear 41 is coaxially arranged at one end of the first rotating shaft 4; one end of the first rotating shaft 4 passes through the first hole 24 of the first elongated limiting plate 2 and a positioning hole 231 of the elongated positioning plate 23, so that one side of the elongated positioning plate 23 presses against one side of the first gear 41; one end of the first rotating shaft 4 is connected to a first connecting member 42, and the first connecting member 42 can be connected to one side of a touch screen or a flexible screen of an electronic device. Two axial parallel surfaces are coaxially arranged at the other end of the first rotating shaft 4, and after the other end of the first rotating shaft 4 passes through the first axial hole 31 of the second elongated limiting plate 3, it passes through a plurality of first elastic sheets 43 and is locked and fixed with a first nut 44, so that the two ends of the plurality of first elastic sheets 43 press against the first nut 44 and the second elongated limiting plate 3 respectively, so that the first rotating shaft 4 and the first connecting member 42 can freely stop or be positioned at a preset angle position when rotating synchronously.

[0077] The second rotating shaft 5 is parallel to the first rotating shaft 4. A second gear 51 is coaxially arranged at one end of the second rotating shaft 5. The second gear 51 is gear-connected to an intermediate gear set 52, and the intermediate gear set 52 is gear-connected to the first gear 41, so that the first rotating shaft 4 is connected to the second rotating shaft 5 in a relatively rotatable manner. During implementation, the first gear 41, the intermediate gear set 52 and the second gear 51 are combined to form a co-acting gear set 53.

[0078] One end of the second rotating shaft 5 passes through the second hole 26 of the first elongated limiting plate 2 and the other positioning hole 231 of the elongated positioning plate 23, so that one side of the elongated positioning plate 23 presses against one side of the second gear 51; one end of the second rotating shaft 5 is connected to a second connecting member 54, and the second connecting member 54 can be used to connect the keyboard input unit of the electronic device or the other side of the flexible screen. The other end of the second rotating shaft 5 is coaxially provided with two axial parallel surfaces, and after the other end of the second rotating shaft 5 passes through the second axial hole 33 of the second elongated limiting plate 3, it passes through a plurality of second elastic sheets 55 and is locked and fixed with a second nut 56, so that the two ends of the plurality of second elastic sheets 55 press against the second nut 56 and the second elongated limiting plate 3 respectively, so that the second rotating shaft 5 and the second connecting member 54 can freely stop or be positioned at a preset angle position when rotating synchronously.

[0079] The torsion structure 6 is sandwiched between the second elongated stop plate 3 and the first elongated stop plate 2, and is located between the first rotating shaft 4 and the second rotating shaft 5. The torsion structure 6 includes a first cam member 61, a first push plate 62, an elastic member 63, a second cam member 64 and a second push plate 65, wherein the first cam member 61 is coaxially arranged with the first rotating shaft 4, and the first cam member 61 has a first sleeve 611, and the first sleeve 611 is sleeved with the first rotating shaft 4, so that the first cam member 61 and the first rotating shaft 4 rotate synchronously; the outer periphery of the first sleeve 611 has an axial section and a first arc convex portion 613, and in implementation, the axial section is used as the first plane portion 612; and the first arc convex portion 613 is formed by extending outward from one side of the first plane portion 612 in a gradually expanding manner, or is an arc portion with a gradually changing radius. The first push piece 62 is a flat plate, and one side end of the first push piece 62 has a first sliding portion 621, which is limited and connected to the first limiting portion 25 in a relatively movable manner, wherein the first sliding portion 621 and the first limiting portion 25 can interchange the groove body and the sliding portion, but not limited to this; the other side end of the first push piece 62 has a second sliding portion 622, which is limited and connected to the second limiting portion 32 in a relatively movable manner, wherein the second The sliding portion 622 and the second limiting portion 32 can interchange the groove body and the sliding portion, but this is not limited to this; the top end surface of the first push piece 62 presses upward against the first planar portion 612 of the first cam member 61; the bottom end surface of the first push piece 62 has a circular lower protrusion, and during implementation, the circular lower protrusion serves as the first protrusion 623; the outer periphery of the first protrusion 623 has a coaxial first annular groove 624 to accommodate the limiting and pressing top end of a compression spring, which serves as the elastic member 63.

[0080] The second cam member 64 is coaxially arranged with the second rotating shaft 5, and the second cam member 64 has a second sleeve 641, and the second sleeve 641 is sleeved on the second rotating shaft 5, so that the second cam member 64 and the second rotating shaft 5 rotate synchronously; the outer periphery of the second sleeve 641 has another axial section and a second arc convex portion 643, and during implementation, the other axial section serves as the second plane portion 642; and the second arc convex portion 643 is formed by a side edge of the second plane portion 642 extending outward in a gradually expanding manner, or is an arc-shaped portion with a gradually changing radius. The second push piece 65 is a flat plate, and one side end of the second push piece 65 has a third sliding portion 651, which is limited and connected to the first limiting portion 25 in a relatively movable manner, wherein the third sliding portion 651 and the first limiting portion 25 can interchange the groove body and the sliding portion, but not limited thereto; the other side end of the second push piece 65 has a fourth sliding portion 652, which is limited and connected to the second limiting portion 32 in a relatively movable manner, wherein the fourth sliding portion 652 and the first limiting portion 25 can interchange the groove body and the sliding portion, However, the present invention is not limited thereto; the bottom end surface of the second push piece 65 presses downwardly against the second flat surface 642 of the second cam member 64; the top end surface of the second push piece 65 has a convex circular cylinder, which is used as the second protrusion 653 during implementation, and the second protrusion 653 is relatively telescopically sleeved on the first protrusion 623 of the first push piece 62; the outer periphery of the second protrusion 653 has a coaxial second annular groove 654, so that after the elastic member 63 sleeves on the second protrusion 653, the bottom end of the elastic member 63 is accommodated and pressed in the second annular groove 654. During implementation, the elastic member 63 can also be as follows Figure 5 As shown, a plurality of annular spring pieces 631 are coaxially stacked.

[0081] By this, Figure 1 , Figure 2 and Figure 6 , Figure 7 As shown, when the user opens the touch screen from the 0-degree position and then flips it 180 degrees respectively, so that the touch screen is relatively overlapped with the back of the keyboard input unit or the flexible screen, the first rotating shaft 4 and the second rotating shaft 5 can be synchronously rotated relative to each other, so that the first cam member 61 and the second cam member 64 can be rotated respectively, and the first arc convex portion 613 and the second arc convex portion 643 can push the first pushing piece 62 and the second pushing piece 65 respectively; and through the gradual expansion of the arc of the first arc convex portion 613 and the second arc convex portion 643, the elastic member 63 can produce different compression deformation amounts as needed, so as to change the rotational torque of the first rotating shaft 4 and the second rotating shaft 5 respectively.

[0082] In summary, the present invention adds a torsion structure 6 between two rotating shafts (a first rotating shaft 4 and a second rotating shaft 5), wherein the first rotating shaft 4 and the second rotating shaft 5 are respectively connected to a first cam member 61 and a second cam member 64, and the first cam member 61 presses a first push piece 62 downward, and the second cam member 64 presses a second push piece 65 upward, and then the first push piece 62 and the second push piece 65 push in the opposite direction to compress the two ends of an elastic member 63, so that the first rotating shaft 4 and the second rotating shaft 5 can be provided with a torsion force within a specific angle range. force changes; and when the first rotating shaft 4 and the second rotating shaft 5 rotate at different angles, the curvature of the first arc convex portion 613 and the second arc convex portion 643 changes, so that the elastic member 63 can produce different compression deformation amounts as needed, thereby generating different rotational torques at different angles; at the same time, a plurality of first elastic sheets 43 are provided on the first rotating shaft 4, and a plurality of second elastic sheets 55 are provided on the second rotating shaft 5, which can provide larger torque values ​​on the basis of the original torque components, thereby meeting different needs and being flexibly applied to different products.

[0083] Although the present invention discloses a preferred specific embodiment to achieve the above-mentioned purpose, it is not intended to limit the structural features of the present invention. Any person skilled in the art should know that under the technical spirit of the present invention, any easily conceivable changes or modifications are possible and are all covered by the scope of the patent application of the present invention.

Claims

1. A dual-axis rotation structure, comprising a first rotation axis and a second rotation axis, wherein the first rotation axis is connected to the second rotation axis in a relatively rotatable manner, characterized in that: A torsion structure is provided between the first rotating shaft and the second rotating shaft, and the torsion structure includes a first cam member, a first push plate and an elastic member. The first cam member is coaxially arranged with the first rotating shaft, one end face of the first push plate presses against the first cam member, and the other end face of the first push plate presses against one end of the elastic member, so that when the first rotating shaft and the first cam member rotate synchronously, the elastic member is compressed and the rotational torque of the first rotating shaft is changed.

2. The dual-axis rotation structure according to claim 1, characterized in that: The torsion structure includes a first elongated limiting plate and a second elongated limiting plate parallel to each other, the first elongated limiting plate having a first hole, a first limiting portion and a second hole arranged in the length direction, one end of the first rotating shaft is penetrated by the first hole, and one end of the second rotating shaft is penetrated by the second hole; the second elongated limiting plate has a first axial hole, a second limiting portion and a second axial hole arranged in the length direction, the other end of the first rotating shaft is penetrated by the first axial hole, and the other end of the second rotating shaft is penetrated by the second axial hole; one end of the first pushing piece has a first sliding portion, the first sliding portion is connected to the first limiting portion in a relatively movable manner, and the other end of the first pushing piece has a second sliding portion, the second sliding portion is connected to the second limiting portion in a relatively movable manner.

3. The dual-axis rotation structure according to claim 1, characterized in that: The first cam member has a first sleeve, the outer periphery of which has a first plane portion and a first arc convex portion, the first plane portion presses against the end surface of the first push piece, and the first arc convex portion extends outward from one side of the first plane portion in a gradually expanding manner.

4. The dual-axis rotation structure according to claim 1, characterized in that: The torque structure also includes a second cam member and a second push plate. The second cam member is coaxially arranged with the second rotating shaft. One end face of the second push plate presses against the second cam member, and the other end face of the second push plate presses against the other end of the elastic member, so that when the second rotating shaft and the second cam member rotate synchronously, the elastic member is compressed and the rotational torque of the second rotating shaft is changed.

5. The dual-axis rotation structure according to claim 4, characterized in that: The torsion structure includes a first elongated limiting plate and a second elongated limiting plate parallel to each other, the first elongated limiting plate having a first hole, a first limiting portion and a second hole arranged in the length direction, one end of the first rotating shaft is penetrated by the first hole, and one end of the second rotating shaft is penetrated by the second hole; the second elongated limiting plate has a first axial hole, a second limiting portion and a second axial hole arranged in the length direction, the other end of the first rotating shaft is penetrated by the first axial hole, and the other end of the second rotating shaft is penetrated by the second axial hole; one end of the second pushing piece has a third sliding portion, the third sliding portion is connected to the first limiting portion in a relatively movable manner, and the other end of the second pushing piece has a fourth sliding portion, the fourth sliding portion is connected to the second limiting portion in a relatively movable manner.

6. The dual-axis rotation structure according to claim 4 or 5, characterized in that: The second cam member has a second sleeve, the outer periphery of which has a second plane portion and a second arc convex portion, the second plane portion presses against the end surface of the second push piece, and the second arc convex portion extends outward from one side of the second plane portion in a gradually expanding manner.

7. The dual-axis rotation structure according to claim 4, characterized in that: The other end surface of the second push piece has a second protrusion, the outer periphery of the second protrusion has a coaxial second annular groove, the elastic member is sleeved with the second protrusion, and the other end of the elastic member is limited in the second annular groove.

8. The dual-axis rotation structure according to claim 7, characterized in that: The other end surface of the first push piece has a first protrusion, the outer periphery of the first protrusion has a coaxial first annular groove, the first protrusion is sleeved with the second protrusion in a relatively telescopic manner, and the one end of the elastic member is limited to be located in the first annular groove.

9. The dual-axis rotation structure according to claim 1, characterized in that: The elastic member includes a plurality of coaxially stacked annular elastic sheets.

10. The dual-axis rotation structure according to claim 1, characterized in that: A first gear is coaxially arranged at one end of the first rotating shaft, a second gear is coaxially arranged at one end of the second rotating shaft, and an intermediate gear set is gear-connected with the first gear and the second gear.

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