Babaka driving device

Abstract

The invention provides a babaka driving device. A mounting cavity is formed in a shell assembly; the speed reduction assembly is located in the installation cavity and comprises an input gear, a first-stage duplex speed reduction gear, a second-stage duplex speed reduction gear, a third-stage duplex speed reduction gear and a fourth-stage speed reduction gear, and the first-stage duplex speed reduction gear is connected with the input gear and the second-stage duplex speed reduction gear in an engaged mode. The third-stage duplex reduction gear is connected with the second-stage duplex reduction gear and the fourth-stage reduction gear in a meshed mode. A driving motor rotating shaft is connected with the input gear; and one end of the pull rope is wound on the fourth-stage reduction gear. According to the babaka driving device, the driving motor drives the input gear to rotate, the four-stage speed reduction gear achieves four-wave speed reduction through conduction of the first-stage duplex speed reduction gear, the second-stage duplex speed reduction gear and the third-stage duplex speed reduction gear in sequence, the speed reduction ratio is increased, the output pulling force of the pull rope is increased, and therefore the torque requirement of the motor is reduced, and the service life of the motor is prolonged. And the torque requirement meeting the requirement can be obtained without adopting a motor with a relatively large volume.

Description

Technical Field

[0001] The present application relates to the field of body shaping auxiliary equipment, and in particular to a Bei Bei Jia driving device. Background Art

[0002] At present, primary and secondary school students have heavy homework, and their schoolbags are getting heavier and heavier. In addition, there are fewer and fewer systematic physical activities, and their muscles and ligaments are not strengthened enough. Carrying weight on one shoulder for a long time will directly affect the normal state and function of the spine.

[0003] Some of the "Beibeijia" products currently on the market can actively remind users to correct spinal curvature problems by actively exerting force. This usually involves identifying the user's current state through a controller to drive the power device to work and achieve active force reminders. This requires the configuration of modules such as motors and controllers, and also requires consideration of the size of the active force. Therefore, such products are generally large in size and not easy to carry. Summary of the invention

[0004] Based on this, it is necessary to provide a Beibeijia driving device to address the problem that the existing Beibeijia products with active force reminder are large in size.

[0005] A Beibeijia driving device comprises: a shell assembly, a mounting cavity is formed inside the shell assembly, the shell assembly is provided with an opening, and the opening is communicated with the mounting cavity; a reduction assembly, the reduction assembly is in the mounting cavity, the reduction assembly comprises an input gear, a first-stage double reduction gear, a second-stage double reduction gear, a third-stage double reduction gear and a fourth-stage reduction gear, the first-stage double reduction gear is respectively meshed and connected with the input gear and the second-stage double reduction gear, and the third-stage double reduction gear is respectively meshed and connected with the second-stage double reduction gear and the fourth-stage reduction gear; a driving motor, the driving motor is arranged on the shell assembly, and the rotating shaft portion of the driving motor extends into the mounting cavity and is transmission-connected with the input gear; a pull rope, one end of the pull rope is wound around the fourth-stage reduction gear, and the other end of the pull rope extends to the outside through the opening.

[0006] The Beibeijia driving device disclosed in the present application connects the driving motor with the input gear to drive the input gear to rotate, the first-stage double reduction gear is meshed with the input gear to form the first wave of reduction, the first-stage double reduction gear is meshed with the second-stage double reduction gear to form the second wave of reduction, the second-stage double reduction gear is meshed with the third-stage double reduction gear to form the third wave of reduction, and the third-stage double reduction gear is meshed with the fourth-stage reduction gear to form the fourth wave of reduction; a pull rope is wrapped around the fourth-stage reduction gear, when the driving motor drives the input gear to rotate, the fourth-stage reduction gear tightens or loosens the pull rope through the first-stage double reduction gear, the second-stage double reduction gear and the third-stage double reduction gear in turn, and at the same time, the four-stage reduction gear undergoes four waves of reduction, thereby improving the reduction ratio and increasing the output tension of the pull rope, thereby reducing the torque requirement of the motor. At this time, there is no need to use a larger motor to obtain the required torque requirement, thereby achieving the goal of small size of such Beibeijia products and strong pull rope resistance.

[0007] In one embodiment, the housing assembly is heart-shaped, and the input gear, the first-stage double reduction gear, the second-stage double reduction gear, the third-stage double reduction gear and the fourth-stage reduction gear are arranged in sequence from the bottom to the top of the heart shape.

[0008] The Beibeijia drive device in the above embodiment further defines that the overall shape of the shell assembly is heart-shaped, wherein the input gear is located at the bottom of the heart-shaped figure, and the first-stage double reduction gear, the second-stage double reduction gear, the third-stage double reduction gear and the fourth-stage reduction gear are arranged in sequence along the central axis direction of the heart-shaped figure, thereby greatly reducing the size of the required installation cavity.

[0009] In one embodiment, the shell assembly includes a box cover and a bottom shell, the box cover and the bottom shell are combined to form the installation cavity, and a first groove is formed at one end of the bottom shell close to the input gear, the first groove is provided with a first through hole, the first through hole is connected to the installation cavity, the first groove is adapted to the drive motor, and the drive motor part extends through the first through hole to the installation cavity and is connected to the input gear.

[0010] The Beibeijia driving device in the above embodiment further defines that the shell assembly is composed of a box cover and a bottom shell, and the bottom shell forms a first groove on the side close to the input gear, and the first groove is matched with the driving motor. By setting the first groove, the height difference formed by the driving motor relative to the bottom shell can be reduced, so that the overall volume of the Beibeijia product with active force reminder can be made smaller.

[0011] In one embodiment, the box cover and the bottom shell are detachably connected.

[0012] In one embodiment, the number of the three-stage double reduction gears and the number of the four-stage reduction gears are both two, the two three-stage double reduction gears are respectively meshed and connected with the two-stage double reduction gears, and the two four-stage reduction gears are correspondingly meshed and connected with the two three-stage double reduction gears.

[0013] The Beibeijia driving device in the above embodiment further limits the number of three-stage double reduction gears and four-stage reduction gears to two. Specifically, the two-stage double reduction gears are respectively meshed and connected with the two three-stage double reduction gears at the same time, and the two four-stage reduction gears are respectively meshed and connected with the two three-stage double reduction gears in a one-to-one correspondence; the two four-stage reduction gears are respectively wrapped with pull ropes, thereby providing tension correction or reminder in both left and right directions.

[0014] In one embodiment, the center axis points of the input gear, the first-stage double reduction gear and the second-stage double reduction gear are all located on the central symmetry axis of the housing assembly, and the two third-stage double reduction gears and the two fourth-stage reduction gears are symmetrically distributed along the central symmetry axis.

[0015] The Beibeijia drive device in the above embodiment further defines that the center axis points of the input gear, the first-stage double reduction gear and the second-stage double reduction gear are all located on the central symmetry axis of the shell assembly, and the two third-stage double reduction gears and the two fourth-stage reduction gears are symmetrically distributed along the central symmetry axis, and all the gears are arranged in a herringbone shape in the mounting cavity, which cooperates with the heart-shaped shell assembly to fully utilize the space, thereby effectively reducing the volume of the Beibeijia product.

[0016] In one embodiment, the first-stage double reduction gear includes a first gear and a second gear, the first gear is coaxially connected to the second gear, the number of teeth of the first gear is smaller than the number of teeth of the second gear, the second gear is meshed with the input gear, and the number of teeth of the input gear is smaller than the number of teeth of the second gear; the second-stage double reduction gear includes a third gear and a fourth gear, the third gear is coaxially connected to the fourth gear, the number of teeth of the third gear is smaller than the number of teeth of the fourth gear, the fourth gear is meshed with the first gear, and the number of teeth of the first gear is smaller than the number of teeth of the fourth gear; the third-stage double reduction gear includes a fifth gear and a sixth gear, the fifth gear is coaxially connected to the sixth gear, the number of teeth of the fifth gear is smaller than the number of teeth of the sixth gear, the fifth gear is meshed with the fourth-stage reduction gear, the sixth gear is meshed with the third gear, and the number of teeth of the third gear is smaller than the number of teeth of the sixth gear.

[0017] In the above-mentioned embodiment, the first-stage double reduction gear, the second-stage double reduction gear and the third-stage double reduction gear are further defined as combination gears, wherein the first-stage double reduction gear is composed of a first gear and a second gear, and the first gear is directly coaxially connected to the second gear; the second-stage double reduction gear is composed of a third gear and a fourth gear, and the third gear is coaxially connected to the fourth gear; the third-stage double reduction gear is composed of a fifth gear and a sixth gear, and the fifth gear is directly coaxially connected to the sixth gear; by making the first-stage double reduction gear, the second-stage double reduction gear and the third-stage double reduction gear all combination gears, it provides feasible conditions for all gears to achieve meshing connection within a certain volume of space and form a four-wave deceleration effect.

[0018] In one embodiment, a connecting column is formed between the third gear and the fourth gear, the third gear, the connecting column and the fourth gear are coaxially connected in sequence, the installation cavity at least includes a first space, a second space and a third space that are connected in sequence, the meshing point between the input gear and the second gear is located in the second space, the meshing point between the first gear and the fourth gear is located in the first space, the meshing point between the third gear and the sixth gear is located in the third space, and the meshing point between the fifth gear and the fourth-stage reduction gear is located in the second space.

[0019] In the above embodiment, it is further defined that a connecting column is connected between the third gear and the fourth gear to increase the relative distance between the third gear and the fourth gear, the meshing point of the input gear and the second gear is located in the second space, the meshing point of the first gear and the fourth gear is located in the first space, the meshing point of the third gear and the sixth gear is located in the third space, and the meshing point of the fifth gear and the four-stage reduction gear is located in the second space. By distributing the gear meshing points in the first space, the second space and the third space respectively, mutual interference between gears is avoided, and the space of the entire gear is compressed to a minimum, thereby greatly reducing the volume of the Beibeijia product.

[0020] In one embodiment, the outer diameter of the four-stage reduction gear is larger than the outer diameter of any one of the input gear, the first-stage double reduction gear, the second-stage double reduction gear, and the third-stage double reduction gear.

[0021] In one of the embodiments, an annular groove is formed on a side of the four-stage reduction gear away from the three-stage double reduction gear, and the annular groove is used for winding the pull rope.

[0022] In the above-mentioned embodiment, it is further defined that the four-stage reduction gear forms an annular groove and is used for winding the pull rope. By winding the pull rope around the annular groove of the four-stage reduction gear with the largest outer diameter, the output tension of the pull rope is increased, thereby reducing the torque requirement of the motor. Therefore, the size of the motor can be as small as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional diagram of a back-to-back driving device in one embodiment;

[0024] Figure 2 is a cross-sectional view of a back-to-back driving device in one embodiment taken along a first direction;

[0025] Figure 3 An exploded view of a Beibeijia driving device in one embodiment;

[0026] Figure 4 A schematic diagram of the installation of a four-stage reduction gear and a pull rope in an embodiment;

[0027] Figure 5 FIG. 2 is a cross-sectional view taken along the second direction of a back-to-back driving device in one embodiment. FIG.

[0028] Reference numerals:

[0029] 10 housing assembly, 11 case cover, 12 bottom shell, 121 first groove, 101 installation cavity, 102 opening, 103 first through hole;

[0030] 50 driving motor;

[0031] 30 reduction assembly, 31 input gear, 32 first-stage double reduction gear, 321 first gear, 322 second gear, 33 second-stage double reduction gear, 331 third gear, 332 connecting column, 333 fourth gear, 34 third-stage double reduction gear, 341 fifth gear, 342 sixth gear, 35 fourth-stage reduction gear, 301 annular groove;

[0032] 70 draw cord. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0035] like Figures 1 to 4As shown: This embodiment provides a Beibeijia driving device, including: a shell component 10, a mounting cavity 101 is formed inside the shell component 10, and the shell component 10 is provided with an opening 102, and the opening 102 is connected to the mounting cavity 101; a reduction assembly 30, the reduction assembly 30 is in the mounting cavity 101, the reduction assembly 30 includes an input gear 31, a first-stage double reduction gear 32, a second-stage double reduction gear 33, a third-stage double reduction gear 34 and a fourth-stage reduction gear 35, the first-stage double reduction gear 32 is meshed with the input gear 31 and the second-stage double reduction gear 33, respectively, and the third-stage double reduction gear 34 is meshed with the second-stage double reduction gear 33 and the fourth-stage reduction gear 35, respectively; a driving motor 50, the driving motor 50 is arranged on the shell component 10, and the rotating shaft portion of the driving motor 50 extends into the mounting cavity 101 and is transmission-connected with the input gear 31; a pull rope 70, one end of the pull rope 70 is wound around the fourth-stage reduction gear 35, and the other end of the pull rope 70 extends to the outside through the opening 102.

[0036] The above-mentioned Beibeijia driving device is connected to the input gear 31 through the driving motor 50 to drive the input gear 31 to rotate, the first-stage double reduction gear 32 is meshed with the input gear 31 to form a first wave of reduction, the first-stage double reduction gear 32 is meshed with the second-stage double reduction gear 33 to form a second wave of reduction, the second-stage double reduction gear 33 is meshed with the third-stage double reduction gear 34 to form a third wave of reduction, and the third-stage double reduction gear 34 is meshed with the fourth-stage reduction gear 35 to form a fourth wave of reduction; by winding a pull rope 70 around the fourth-stage reduction gear 35, when the driving After the motor 50 drives the input gear 31 to rotate, the four-stage reduction gear 35 tightens or loosens the pull rope 70 through the transmission of the first-stage double reduction gear 32, the second-stage double reduction gear 33 and the third-stage double reduction gear 34 in turn. At the same time, the four-stage reduction gear 35 undergoes four-wave reduction, which improves the reduction ratio and increases the output tension of the pull rope 70, thereby reducing the torque requirement of the motor. At this time, there is no need to use a larger motor to obtain the required torque requirement, thereby achieving the goal of small size of such Beibeijia products and strong tension-bearing capacity of the pull rope 70.

[0037] like Figure 1 to Figure 2 As shown, in addition to the features of the above-mentioned embodiments, the present embodiment further defines that: the housing assembly 10 is heart-shaped, and the input gear 31, the first-stage double reduction gear 32, the second-stage double reduction gear 33, the third-stage double reduction gear 34 and the fourth-stage reduction gear 35 are arranged in sequence from the bottom to the top of the heart shape.

[0038] The above-mentioned embodiment further defines that the overall shape of the shell assembly 10 is heart-shaped, wherein the input gear 31 is located at the bottom of the heart-shaped figure, and the first-stage double reduction gear 32, the second-stage double reduction gear 33, the third-stage double reduction gear 34 and the fourth-stage reduction gear 35 are arranged in sequence along the central axis direction of the heart-shaped figure, thereby greatly reducing the size of the required installation cavity 101.

[0039] like Figures 1 to 3 As shown, in addition to the features of the above embodiments, this embodiment further defines: the housing assembly 10 includes a box cover 11 and a bottom shell 12, the box cover 11 and the bottom shell 12 enclose a mounting cavity 101, and a first groove 121 is formed at one end of the bottom shell 12 close to the input gear 31, the first groove 121 is provided with a first through hole 103, the first through hole 103 is connected to the mounting cavity 101, the first groove 121 is adapted to the drive motor 50, and a portion of the drive motor 50 extends through the first through hole 103 to the mounting cavity 101 and is connected to the input gear 31.

[0040] The above-mentioned embodiment further defines that the shell assembly 10 is composed of a box cover 11 and a bottom shell 12, and the bottom shell 12 forms a first groove 121 on the side close to the input gear 31, and the first groove 121 is matched with the drive motor 50. By setting the first groove 121, it is beneficial to reduce the height difference formed by the drive motor 50 relative to the bottom shell 12, so that the overall volume of the Beibeijia product with active force reminder can be made smaller.

[0041] In addition to the features of the above embodiments, this embodiment further defines that the box cover 11 and the bottom shell 12 are detachably connected.

[0042] like Figure 2 and Figure 3 As shown, in addition to the features of the above-mentioned embodiments, the present embodiment further defines that: the number of the three-stage double reduction gears 34 and the number of the four-stage reduction gears 35 are both two, the two three-stage double reduction gears 34 are respectively meshed and connected with the two-stage double reduction gears 33, and the two four-stage reduction gears 35 are correspondingly meshed and connected with the two three-stage double reduction gears 34.

[0043] The above-mentioned embodiment further limits the number of the three-stage double reduction gears 34 and the four-stage reduction gears 35 to two. Specifically, the two-stage double reduction gear 33 is meshed and connected with the two three-stage double reduction gears 34 at the same time, and the two four-stage reduction gears 35 are meshed and connected with the two three-stage double reduction gears 34 in a one-to-one correspondence; the two four-stage reduction gears 35 are respectively wrapped with pull ropes 70, so as to provide tension correction or reminder in the left and right directions.

[0044] like Figure 2As shown, in addition to the features of the above-mentioned embodiments, the center axis points of the input gear 31, the first-stage double reduction gear 32 and the second-stage double reduction gear 33 are all located on the central symmetry axis of the housing assembly 10, and the two third-stage double reduction gears 34 and the two fourth-stage reduction gears 35 are symmetrically distributed along the central symmetry axis.

[0045] The above-mentioned embodiment further defines that the center axis points of the input gear 31, the first-stage double reduction gear 32 and the second-stage double reduction gear 33 are all located on the central symmetry axis of the shell assembly 10, and the two third-stage double reduction gears 34 and the two fourth-stage reduction gears 35 are symmetrically distributed along the central symmetry axis, and all the gears are arranged in a herringbone shape in the mounting cavity 101, which cooperates with the heart-shaped shell assembly 10 to fully utilize the space and can effectively reduce the volume of the Beibeijia product.

[0046] like Figure 2 and Figure 4 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the first-stage double reduction gear 32 includes a first gear 321 and a second gear 322, the first gear 321 is coaxially connected to the second gear 322, the number of teeth of the first gear 31 is less than the number of teeth of the second gear 332, the second gear 322 is meshedly connected to the input gear 31, and the number of teeth of the input gear 31 is less than the number of teeth of the second gear 322; the second-stage double reduction gear 33 includes a third gear 331 and a fourth gear 333, the third gear 331 is coaxially connected to the fourth gear 333, the number of teeth of the third gear 331 is less than the number of teeth of the fourth gear 332. The fourth gear 333 is meshed with the first gear 321, and the number of teeth of the first gear is smaller than that of the fourth gear; the three-stage double reduction gear 34 includes a fifth gear 341 and a sixth gear 342, the fifth gear 341 is coaxially connected with the sixth gear 342, the number of teeth of the fifth gear 341 is smaller than that of the sixth gear 342, the fifth gear 341 is meshed with the fourth-stage reduction gear 35, the number of teeth of the fifth gear 341 is smaller than that of the fourth-stage reduction gear, the sixth gear 342 is meshed with the third gear 331, and the number of teeth of the third gear 331 is smaller than that of the sixth gear 342.

[0047] The above-mentioned embodiment further defines that the first-stage double reduction gear 32, the second-stage double reduction gear 33 and the third-stage double reduction gear 34 are combined gears, wherein the first-stage double reduction gear 32 is composed of a first gear 321 and a second gear 322, and the first gear 321 is directly coaxially connected to the second gear 322; the second-stage double reduction gear 33 is composed of a third gear 331 and a fourth gear 333, and the third gear 331 is coaxially connected to the fourth gear 333; the third-stage double reduction gear 34 is composed of a fifth gear 341 and a sixth gear 342, and the fifth gear 341 is directly coaxially connected to the sixth gear 342; the first-stage double reduction gear 32, the second-stage double reduction gear 33 and the third-stage double reduction gear 34 are all combined gears, thereby providing feasible conditions for all gears to achieve meshing connection within a certain volume of space and form a four-wave reduction effect.

[0048] It should be noted that the principle of gear reduction is to use the meshing principle of gears to reduce the speed. It is usually composed of two or more gears, one of which is called the driving gear and the other is called the driven gear. When the driving gear rotates, the teeth of the driving gear mesh with the teeth of the driven gear, thereby driving the driven gear to rotate; since the number of teeth on the driven gear is greater than that on the driving gear, the speed of the driven gear will be lower than that of the driving gear, thereby achieving the purpose of speed reduction.

[0049] like Figure 4 As shown, in addition to the features of the above-mentioned embodiments, the present embodiment further defines: a connecting column is formed between the third gear 331 and the fourth gear, the third gear and the fourth gear are coaxially connected in sequence, the mounting cavity 101 includes at least a first space, a second space and a third space which are connected in sequence, the meshing point of the input gear 31 and the second gear 322 is located in the second space, the meshing point of the first gear 321 and the fourth gear 333 is located in the first space, the meshing point of the third gear 331 and the sixth gear 342 is located in the third space, and the meshing point of the fifth gear 341 and the fourth-stage reduction gear 35 is located in the second space.

[0050] The above-mentioned embodiment further defines that a connecting column is formed between the third gear 331 and the fourth gear, and the third gear and the fourth gear are coaxially connected in sequence, so as to increase the relative distance between the third gear 331 and the fourth gear 333, the meshing point of the input gear 31 and the second gear 322 is located in the second space, the meshing point of the first gear 321 and the fourth gear 333 is located in the first space, the meshing point of the third gear 331 and the sixth gear 342 is located in the third space, and the meshing point of the fifth gear 341 and the four-stage reduction gear 35 is located in the second space. By distributing the gear meshing points in the first space, the second space and the third space respectively, mutual interference between gears is avoided, and the space of the entire gear is compressed to a minimum, thereby greatly reducing the volume of the Beibeijia product.

[0051] like Figure 2 As shown, in addition to the features of the above-mentioned embodiments, this embodiment further defines that the outer diameter of the four-stage reduction gear 35 is larger than the outer diameter of any input gear 31 , the first-stage double reduction gear 32 , the second-stage double reduction gear 33 and the third-stage double reduction gear 34 .

[0052] like Figure 4 As shown, in addition to the features of the above embodiments, this embodiment further defines that: an annular groove 301 is formed on the side of the four-stage reduction gear 35 away from the three-stage double reduction gear, and the annular groove 301 is used for winding the pull rope 70.

[0053] The above-mentioned embodiment further defines that the four-stage reduction gear 35 forms an annular groove 301 and is used for winding the pull rope 70. By winding the pull rope 70 in the annular groove 301 of the four-stage reduction gear 35 with the largest outer diameter, the output tension of the pull rope 70 is increased, thereby reducing the torque requirement of the motor. Therefore, the size of the motor can be as small as possible.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A driving device for a back-to-back motor, It is characterized in that include: A housing assembly (10), wherein a mounting cavity (101) is formed inside the housing assembly (10), and the housing assembly (10) is provided with an opening (102), wherein the opening (102) is in communication with the mounting cavity (101); A reduction assembly (30), the reduction assembly (30) being located in the installation cavity (101), the reduction assembly (30) comprising an input gear (31), a first-stage double reduction gear (32), a second-stage double reduction gear (33), a third-stage double reduction gear (34) and a fourth-stage reduction gear (35), the first-stage double reduction gear (32) being meshed and connected with the input gear (31) and the second-stage double reduction gear (33), respectively, the third-stage double reduction gear (34) being meshed and connected with the second-stage double reduction gear (33) and the fourth-stage reduction gear (35), respectively; A drive motor (50), the drive motor (50) being arranged on the housing assembly (10), the rotating shaft portion of the drive motor (50) extending into the mounting cavity (101) and being drivingly connected to the input gear (31); A pull rope (70), one end of which is wound around the four-stage reduction gear (35), and the other end of which extends to the outside through the opening (102).

2. The back-to-back driving device according to claim 1, It is characterized in that The housing assembly (10) is heart-shaped, and the input gear (31), the first-stage double reduction gear (32), the second-stage double reduction gear (33), the third-stage double reduction gear (34) and the fourth-stage reduction gear (35) are arranged in sequence from the bottom to the top of the heart shape.

3. The driving device according to claim 2, It is characterized in that The housing assembly (10) comprises a case cover (11) and a bottom shell (12); the case cover (11) and the bottom shell (12) are combined to form the installation cavity (101); a first groove (121) is formed at one end of the bottom shell (12) close to the input gear (31); a first through hole (103) is provided on the bottom wall of the first groove (121); the first through hole (103) is communicated with the installation cavity (101); the first groove (121) is adapted to the drive motor (50); a portion of the drive motor (50) passes through the first through hole (103) and extends to the installation cavity (101) to be connected with the input gear (31).

4. The Beibeijia driving device according to claim 3, It is characterized in that The box cover (11) and the bottom shell (12) are detachably connected.

5. The back-to-back driving device according to any one of claims 1 and 2, It is characterized in that The number of the three-stage double reduction gear (34) and the number of the four-stage reduction gear (35) are both two, the two three-stage double reduction gears (34) are respectively meshed and connected with the two-stage double reduction gear (33), and the two four-stage reduction gears (35) are correspondingly meshed and connected with the two three-stage double reduction gears (34).

6. The driving device of claim 5, It is characterized in that The central axis points of the input gear (31), the first-stage double reduction gear (32) and the second-stage double reduction gear (33) are all located on the central symmetry axis of the housing assembly (10), and the two third-stage double reduction gears (34) and the two fourth-stage reduction gears (35) are symmetrically distributed along the central symmetry axis.

7. The BeiBeiJia driving device according to claim 1, It is characterized in that The first-stage double reduction gear (32) comprises a first gear (321) and a second gear (322), the first gear (321) and the second gear (322) are coaxially connected, the number of teeth of the first gear (321) is smaller than the number of teeth of the second gear (322), the second gear (322) is meshedly connected with the input gear (31), and the number of teeth of the input gear (31) is smaller than the number of teeth of the second gear (322); The two-stage double reduction gear (33) comprises a third gear (331), a connecting column (332) and a fourth gear (333); the third gear (331) and the fourth gear (333) are coaxially connected; the number of teeth of the third gear (331) is smaller than the number of teeth of the fourth gear (333); the fourth gear (333) is meshedly connected with the first gear (321); the number of teeth of the first gear (321) is smaller than the number of teeth of the fourth gear (333); The three-stage double reduction gear (34) comprises a fifth gear (341) and a sixth gear (342); the fifth gear (341) is coaxially connected with the sixth gear (342); the number of teeth of the fifth gear (341) is smaller than the number of teeth of the sixth gear (342); the fifth gear (341) is meshedly connected with the four-stage reduction gear (35); the number of teeth of the fifth gear (341) is smaller than the number of teeth of the four-stage reduction gear (35); the sixth gear (342) is meshedly connected with the third gear (331); the number of teeth of the third gear (331) is smaller than the number of teeth of the sixth gear (342).

8. The driving device of claim 7, It is characterized in that The third gear (331) and the fourth gear (333) are further formed with a connecting column (332); the third gear (331), the connecting column (332) and the fourth gear (333) are coaxially connected in sequence; the mounting cavity (101) comprises at least a first space, a second space and a third space which are connected in sequence; the meshing point between the input gear (31) and the second gear (322) is located in the second space; the meshing point between the first gear (321) and the fourth gear (333) is located in the first space; the meshing point between the third gear (331) and the sixth gear (342) is located in the third space; and the meshing point between the fifth gear (341) and the fourth-stage reduction gear (35) is located in the second space.

9. The back-to-back driving device according to claim 1, It is characterized in that The outer diameter of the four-stage reduction gear (35) is larger than the outer diameters of any one of the input gear (31), the first-stage double reduction gear (32), the second-stage double reduction gear (33) and the third-stage double reduction gear (34).

10. The back-to-back driving device according to claim 9, It is characterized in that An annular groove (301) is formed on a side of the four-stage reduction gear (35) away from the three-stage double reduction gear, and the annular groove (301) is used to wind the pull rope (70).

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