A transmission

Abstract

The application relates to a transmission device which comprises a motor and a speed reducer and further comprises a magnetic coupler connecting the motor and the speed reducer; the magnetic coupler comprises a driving cylinder and a driven cylinder; the driving cylinder comprises a bearing cylinder, a heat dissipation assembly and a first magnet; the heat dissipation assembly comprises a mounting hole, a heat dissipation piece and a driving ring; the inner wall of the bearing cylinder is provided with the mounting hole; the mounting hole is provided with the heat dissipation piece; the heat dissipation piece comprises a fixed plate, a movable plate, a first screw rod and a gas guide pipe; the right side of the bearing cylinder is fixedly connected with a first connecting ring; the bearing cylinder is provided with the first magnet which is opposite to the mounting hole and is connected with the inner ring of the first connecting ring at the right end; the first magnet is in contact with the bearing cylinder through a convex ridge; the left part of the driven cylinder extends into the bearing cylinder and is connected with a second magnet which is opposite to the first magnet inside and outside. The application solves the problem that the high temperature generated by the coupler on the belt conveyor transmission device can affect the magnetism of the magnet.

Description

Technical Field

[0001] This invention relates to the field of coal mine transportation technology, and specifically to a transmission device. Background Technology

[0002] A belt conveyor is a mechanical device that continuously transports materials using friction-driven propulsion. It can be used to transport materials along a specific conveyor line from the initial feeding point to the final unloading point, forming a material transport process. Belt conveyors are commonly used in coal mining operations for transporting coal ore. The drive drum is a key component of the belt conveyor; its function is to transmit the torque provided by the drive unit at the head of the conveyor to the conveyor belt and utilize the static friction of the belt to transport the coal ore. The drive unit of a belt conveyor generally consists of a motor connected to a reducer, which in turn connects to the drive drum. To provide overload protection for the motor and reducer, a flexible coupling is installed between them. Magnetic couplers are commonly used, with permanent magnet disc couplers being a common type. Permanent magnet disc couplers utilize the principle of like poles repelling and unlike poles attracting in magnetic materials, converting magnetic energy into mechanical energy through magnetic coupling.

[0003] The magnets in existing permanent magnet disc couplers have a tile-like structure and are generally fixed to the inner surface of the outer rotor and the outer surface of the inner rotor by adhesive. However, if adjacent magnets on the inner surface of the outer rotor have opposite polarities, the attraction between magnets with opposite polarities will make it difficult to position and install the magnets on the outer surface of the outer rotor, which is not conducive to the fixation of the magnets. Similarly, the magnets on the outer surface of the inner rotor also have the same fixation problem. Moreover, the coupler generates high temperatures during operation. The higher the temperature, the lower the magnetism of the magnets. For example, although the patent publication CN111262418 A, "A Composite Magnetic Coupler for Coal Mines", provides a structure that can fix the magnets, the magnets in the structure provided by this device are in close contact with the cavity. During use, the high temperature generated by the cavity is directly transferred to the magnets, which reduces the magnetism of the magnets. This weakens the ability of like poles to repel or unlike poles to attract between the magnets on the outer rotor and the inner rotor, thereby reducing the efficiency of the permanent magnet disc coupler in converting magnetic energy into mechanical energy. Summary of the Invention

[0004] This invention addresses the problem that the high temperature generated by the coupler in the transmission device of a belt conveyor affects the magnetism of the magnet. It provides a transmission device that can improve the fixing effect of the magnet, facilitate the heat dissipation of the magnetic coupler, ensure the magnetic stability of the magnet on the magnetic coupler, and ensure the efficiency of the permanent magnet coupler in converting magnetic energy into mechanical energy.

[0005] To solve the above problems, the technical solution of the present invention is:

[0006] A transmission device includes a motor and a reducer, and further includes a magnetic coupler connecting the motor and the reducer;

[0007] The magnetic coupler includes an active cylinder and a driven cylinder. The active cylinder includes a support cylinder, a heat dissipation assembly, and a first magnet. The heat dissipation assembly includes mounting holes, a heat sink, and a drive ring. The inner wall of the support cylinder has an array of mounting holes, and the mounting holes contain heat sinks. The heat sink includes a fixed plate, a movable plate, a first screw, and a duct. The fixed plate is fixedly connected to the mounting holes and has a first one-way valve. The inner end of the first screw is rotatably connected to the fixed plate, and the outer end penetrates the outer peripheral wall of the support cylinder and is fixedly connected to a gear. The movable plate is threadedly connected to the outer periphery of the first screw in the mounting holes. A bellows is connected between the movable plate and the fixed plate. One end of the duct extends into the bellows, and the other end is connected to a second one-way valve on the outer peripheral wall of the support cylinder. The drive ring is sleeved on the outside of the support cylinder, and the inner ring surface has an annular groove covering multiple gears. Multiple left tooth sets are spaced apart on the left side of the annular groove, and a right tooth set is provided on the right side of the annular groove between each two adjacent left tooth sets.

[0008] A first connecting ring is fixedly connected to the right side of the bearing cylinder. A first magnet is provided inside the bearing cylinder, which is opposite to the mounting hole and connected to the first connecting ring at its right end. The first magnet contacts the bearing cylinder through a protrusion. A second magnet extends into the bearing cylinder from the left side of the driven cylinder and is connected to the first magnet, which is opposite to the inside and outside of the first magnet.

[0009] Furthermore, a motor is connected to the left side of the bearing cylinder, and a reducer is connected to the right side of the driven cylinder.

[0010] Furthermore, the left tooth group consists of multiple left teeth spaced apart along the circumferential direction of the drive ring, and the right tooth group consists of multiple right teeth spaced apart along the circumferential direction of the drive ring.

[0011] Furthermore, when each gear and the left tooth set are in a left-right relative state, the teeth at the left end of each gear mesh with the left teeth on the left tooth set; when each gear and the right tooth set are in a left-right relative state, the teeth at the right end of each gear mesh with the right teeth on the right tooth set.

[0012] Furthermore, the distance between the left tooth group and the adjacent right tooth group is greater than the tip circle diameter of the gear.

[0013] Furthermore, both ends of the outer surface of the first magnet are fixedly connected with protrusions. Between each pair of adjacent mounting holes, there are two positioning grooves that are inclined in opposite directions away from the two mounting holes, forming a structure with a positioning groove on each side of each mounting hole. The outer ends of the positioning grooves on both sides of each mounting hole penetrate the inner wall of the bearing cylinder and correspond to the two sides of the adjacent first magnet. The positioning grooves are arranged along the axial direction of the bearing cylinder, and the right end of the positioning groove penetrates the right side of the bearing cylinder.

[0014] Furthermore, each of the positioning slots is fitted with a positioning plate. The right end of the positioning plate is fixedly connected to the side wall of the first connecting ring near the inner ring. The left end of the positioning plate is flush with the left end of the adjacent first magnet. The outer end of each positioning plate extends out of the inner wall of the bearing cylinder and is fixedly connected to the protruding ends of the adjacent first magnets.

[0015] Furthermore, the projected area of ​​the first magnet on the horizontal plane surrounds the cross-sectional area of ​​the mounting hole. The first magnet is an arc-shaped plate with an arc-shaped protrusion facing the inner wall of the bearing cylinder. The second magnet is an arc-shaped plate with an inner side surface corresponding to the outer wall of the driven cylinder. The protrusion is an arc-shaped rod with the same center as the first magnet, the second magnet, the bearing cylinder, and the driven cylinder.

[0016] Furthermore, the left side of the outer peripheral wall of the driven cylinder is arrayed with dovetail grooves that are wider at the inner end and narrower at the outer end. Multiple dovetail grooves are opposite to the inner and outer sides of the first magnet. The left end of each dovetail groove penetrates the left side of the driven cylinder. Each dovetail groove is fitted with a mounting block that matches the dovetail groove. A second magnet is fixedly connected to the outer side of each mounting block.

[0017] Furthermore, the left ends of the plurality of mounting blocks are connected to a second connecting ring, which is fixedly connected to the left side of the driven cylinder.

[0018] The beneficial effects of the present invention through the above technical solution are as follows:

[0019] 1. During the rotation of the bearing cylinder driven by the motor, the heat dissipation component on the bearing cylinder can intermittently blow air to cool the first magnet on the bearing cylinder, avoiding the decrease in magnetism of the first magnet due to high temperature. The first magnet is provided with protrusions so that the first magnet does not directly contact the bearing cylinder, avoiding the direct transfer of heat from the bearing cylinder to the first magnet. Furthermore, a channel is formed between the two protrusions, which is conducive to the gas blown towards the first magnet by the first one-way valve carrying away the heat on the first magnet. The gas discharged through the two protrusions can further carry away the heat on the second magnet on the driven cylinder, thereby ensuring the efficiency of the permanent magnet coupler in converting magnetic energy into mechanical energy.

[0020] 2. When the first magnet of the present invention is installed, the first magnet can be quickly installed on the carrier cylinder because the carrier cylinder has a positioning groove corresponding to the positioning plate on the first magnet. Similarly, the driven cylinder has a dovetail groove corresponding to the mounting block, so the second magnet can be quickly installed on the driven cylinder, ensuring accurate positioning of the first magnet and the second magnet without deviation.

[0021] 3. The first magnet of the present invention is connected to the bearing cylinder via a first connecting ring, and the first connecting ring has a positioning plate inserted into the bearing cylinder, and the positioning plate is connected to the protrusion on the first magnet, which can improve the connectivity between the first magnet and the bearing cylinder. The second magnet on the driven cylinder is fixed via a mounting block and a second connecting ring, which can improve the connectivity between the second magnet and the driven cylinder. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the magnetic coupler of the present invention;

[0024] Figure 3 yes Figure 2 Sectional view at point AA;

[0025] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0026] Figure 5 This is a left-side view of the first connecting ring connecting the positioning plate and the first magnet of the present invention;

[0027] Figure 6 This is a schematic diagram (partial cross-section) of the structure of the first connecting ring connecting the positioning plate and the first magnet of the present invention.

[0028] Figure 7 This is a schematic diagram of the connection between the positioning plate, the protrusion, and the first magnet of the present invention.

[0029] Figure 8 This is a schematic diagram of the unfolded drive ring of the present invention;

[0030] Figure 9 This is a right-side view of the second connecting ring connecting the mounting block and the second magnet of the present invention.

[0031] The attached diagram is labeled as follows: 1 is the base plate, 2 is the support column, 3 is the motor, 4 is the output shaft, 5 is the drive ring, 6 is the second magnet, 7 is the first connecting ring, 8 is the first nut, 9 is the second screw, 10 is the driven cylinder, 11 is the reducer, 13 is the input shaft, 14 is the bearing plate, 15 is the bearing cylinder, 16 is the second nut, 17 is the third screw, 18 is the second connecting ring, 19 is the first magnet, 20 is the convex rib, 21 is the fixing plate, 22 is the left gear assembly, 23 is the first screw, 24 is the gear, 26 is the mounting hole, 27 is the movable plate, 28 is the bellows, 29 is the mounting block, 30 is the dovetail groove, 31 is the annular groove, 32 is the positioning plate, 33 is the second one-way valve, 34 is the air guide pipe, 35 is the first one-way valve, 36 is the positioning groove, 38 is the first bolt through hole, 39 is the right gear assembly, and 40 is the second bolt through hole. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0033] like Figures 1-9 As shown, a transmission device includes a motor 3 and a reducer 11, and also includes a magnetic coupler connecting the motor 3 and the reducer 11.

[0034] The magnetic coupler includes an active cylinder and a driven cylinder 10. The active cylinder includes a support cylinder 15, a heat dissipation assembly, and a first magnet 19. The support cylinder 15 is a cylindrical body with an opening at the right end. The output shaft 4 of the motor 3 is coaxially connected to the left side of the support cylinder 15. The heat dissipation assembly includes mounting holes 26, heat sinks, and a drive ring 5. The right side of the inner wall of the support cylinder 15 has multiple mounting holes 26 arranged in an array. Each mounting hole 26 is a circular blind hole that is recessed into the peripheral wall of the support cylinder 15 and opens towards the central axis of the support cylinder 15. Each mounting hole 26 contains a heat sink. The heat dissipation component includes a fixed plate 21, a movable plate 27, a first screw 23, and an air guide pipe 34. The fixed plate 21 is a circular plate. The inner wall of the fixed plate 21 is fixedly connected to the mounting hole 26 near the opening. The fixed plate 21 is provided with a first one-way valve 35. The outlet of the first one-way valve 35 faces the central axis of the bearing cylinder 15. The inner end of the first screw 23 is coaxially rotatably connected to the fixed plate 21, and the outer end penetrates the outer peripheral wall of the bearing cylinder 15 and is coaxially fixedly connected to a gear 24. The movable plate 27 is a circular plate located in the mounting hole 26. The movable plate 27 is sleeved on the fixed plate 21. The first screw 23 is threadedly connected to the outside of the mounting hole 26 and through a threaded hole in the middle of the movable plate 27. The peripheral wall of the movable plate 27 and the peripheral wall of the mounting hole 26 are in a sliding state. A bellows 28 is connected between the movable plate 27 and the fixed plate 21, which is sleeved on the outside of the first screw 23. The two ends of the bellows 28 are closed by the movable plate 27 and the fixed plate 21, respectively. The air guide pipe 34 is a cylindrical tube. One end of the air guide pipe 34 passes through the movable plate 27 and extends into the bellows 28, and the other end is connected to the second one-way valve 33 on the outer peripheral wall of the bearing cylinder 15. The air inlet of valve 33 faces the outside of the bearing cylinder 15, and the air outlet is connected to the air guide pipe 34. The end of the air guide pipe 34 located inside the bellows 28 is close to the fixed plate 21. The drive ring 5 is a circular ring with an inner diameter larger than the outer diameter of the bearing cylinder 15. The drive ring 5 is coaxially sleeved on the outside of the bearing cylinder 15 and fixed by the bearing plate 14. The inner ring surface of the drive ring 5 is provided with an annular groove 31 covering multiple gears 24. Multiple left tooth sets 22 are spaced apart on the left side of the annular groove 31, and a right tooth set 39 is provided on the right side of the annular groove 31 between each two adjacent left tooth sets 22.

[0035] A first connecting ring 7 with an inner diameter smaller than the inner diameter of the bearing cylinder 15 and an outer diameter equal to the outer diameter of the bearing cylinder is fixedly connected to the right side of the bearing cylinder 15. The bearing cylinder 15 is provided with a first magnet 19 that is opposite to the inner and outer sides of multiple mounting holes 26 and whose right end is connected to the left side of the first connecting ring 7. Each first magnet 19 contacts the bearing cylinder 15 via a protrusion 20.

[0036] The driven cylinder 10 is a cylindrical body with an open left end and a diameter smaller than the inner diameter of the first connecting ring 7. The right side of the driven cylinder 10 is coaxially connected to the end of the input shaft 13 of the reducer 11. The left part of the driven cylinder 10 extends into the bearing cylinder 15 and is connected to a plurality of second magnets 6 that are opposite to the inside and outside of the first magnet 19.

[0037] A base plate 1 is horizontally arranged on the lower side of the motor 3. The base plate 1 is a square plate. The base plate 1 has a support column 2 supporting the motor 3. The upper and lower ends of the bearing plate 14 are respectively fixedly connected to the lower part of the outer ring surface of the drive ring 5 and the top surface of the base plate 1.

[0038] The left tooth group 22 is composed of multiple left teeth spaced apart along the circumference of the drive ring 5, and the right tooth group is composed of multiple right teeth spaced apart along the circumference of the drive ring 5. When each gear 24 and the left tooth group 22 are in a left-right relative state, the teeth at the left end of each gear 24 mesh with the left teeth on the left tooth group 22, driving the first screw 23 to rotate and driving the movable plate 27 to move toward the fixed plate. When each gear 24 and the right tooth group 39 are in a left-right relative state, the teeth at the right end of each gear 24 mesh with the right teeth on the right tooth group 39, driving the first screw 23 to rotate and driving the movable plate 27 to move away from the fixed plate.

[0039] The distance between the left tooth group 22 and the adjacent right tooth group 39 is greater than the tip circle diameter of the gear 24.

[0040] A second screw 9 with its end facing right is provided on the right side of the bearing cylinder 15 between each pair of adjacent mounting holes 26. Multiple second screws 9 pass through the first connecting ring 7 and are limited by the first nut 8. The first connecting ring 7 is provided with a first bolt through hole 38 for the second screw 9 to pass through.

[0041] The first magnet 19 has protruding ribs 20 fixedly connected to both ends of its outer side. Between each pair of adjacent mounting holes 26, there are two positioning grooves 36 that are inclined in opposite directions away from the two mounting holes 26, forming a structure with one positioning groove 36 on each side of each mounting hole 26. The outer ends of the positioning grooves 36 on both sides of each mounting hole 26 penetrate the inner wall of the bearing cylinder 15 and correspond to the two sides of the adjacent first magnet 19. The positioning grooves 36 are arranged along the axial direction of the bearing cylinder 15, and the right end of the positioning groove 36 penetrates the right side of the bearing cylinder 15.

[0042] Each of the positioning slots 36 is fitted with a positioning plate 32. The right end of the positioning plate 32 is fixedly connected to the side wall of the first connecting ring 7 near the inner ring. The left end of the positioning plate 32 is flush with the left end of the adjacent first magnet 19. The outer end of each positioning plate 32 extends out of the inner wall of the bearing cylinder 15 and is fixedly connected to the protruding ends of the adjacent first magnet 19.

[0043] The projected area of ​​the first magnet 19 on the horizontal plane surrounds the cross-sectional area of ​​the mounting hole 26. The first magnet 19 is an arc-shaped plate with an arc protrusion facing the inner wall of the bearing cylinder 15. The second magnet 6 is an arc-shaped plate with its inner side surface corresponding to the outer wall of the driven cylinder 10. The protrusion 20 is an arc-shaped rod with the same center as the first magnet 19, the second magnet 6, the bearing cylinder 15, and the driven cylinder 10.

[0044] The left side of the outer peripheral wall of the driven cylinder 10 is arrayed with dovetail grooves 30 that are wider at the inner end and narrower at the outer end. Multiple dovetail grooves 30 and the first magnet 19 are opposite each other. The left end of each dovetail groove 30 penetrates the left side of the driven cylinder 10. Each dovetail groove 30 is fitted with a mounting block 29 that matches the dovetail groove 30. A second magnet 6 is fixedly connected to the outer side of each mounting block 29.

[0045] The left ends of the multiple mounting blocks 29 are connected to a second connecting ring 18. The second connecting ring 18 is fixedly connected to the left side of the driven cylinder 10. A third screw 17 with its end facing left is provided on the left side of the driven cylinder 10 between each two adjacent mounting blocks 29. The multiple third screws 17 pass through the second connecting ring 18 and are limited by the second nut 16. The second connecting ring 18 is provided with a second bolt through hole 40 for the third screw 17 to pass through.

[0046] The outer diameter of the ring containing the plurality of second magnets 6 is smaller than the inner diameter of the ring containing the plurality of first magnets 19.

[0047] During installation, multiple first magnets 19 are connected to a first connecting ring 7. Each first magnet 19 is connected to a positioning plate 32. The bearing cylinder 15 has a positioning groove 36 corresponding to the positioning plate 32. The positioning plate 32 is inserted into the positioning groove 36. The second screw 9 on the bearing cylinder 15 passes through the first bolt through hole 38 on the first connecting ring 7. The second screw 9 is limited by the first nut 8, thus completing the quick connection between the first magnet 19 and the bearing cylinder 15. Similarly, multiple second magnets 6 are connected to a second connecting ring 18. Each second magnet 6 is connected to a mounting block 29. The driven cylinder 10 has a dovetail groove 30 corresponding to the mounting block 29. The mounting block 29 is inserted into the dovetail groove 30. The third screw 17 on the driven cylinder 10 passes through the corresponding second bolt through hole 40. The third screw 17 is limited by the second nut 16, thus completing the quick connection between the second magnet and the driven cylinder 10.

[0048] In use, the output end of the reducer 11 of this invention is connected to the drive drum of the belt conveyor. The motor 3 drives the bearing cylinder 15 to rotate along its own central axis. During the rotation of the bearing cylinder 15, when the teeth on the left end of each gear 24 mesh with the left teeth on the left tooth set 22, the gear 24 drives the first screw 23 to rotate. Since the movable plate 27 is limited by the air guide pipe 34 and the first screw 23, the movable plate 27 cannot rotate and can only move towards the fixed plate 21. The movable plate 27 drives the bellows 28 to contract, and the air in the bellows 28... The gas is blown through the first one-way valve 35 towards the first magnet 19 corresponding to the mounting hole 26. The first magnet 19 has protrusions 20 to prevent it from directly contacting the bearing cylinder 15, thus avoiding direct heat transfer from the bearing cylinder 15 to the first magnet 19. Furthermore, a channel is formed between the two protrusions 20, which facilitates the removal of heat from the first magnet 19 by the gas blown by the first one-way valve 35. The gas discharged between the two protrusions can further remove heat from the second magnet of the driven cylinder. Each gear 2... After the left teeth on the left end of gear 4 and the left teeth on the left tooth set 22 no longer mesh, the movable plate 27 in the mounting hole 26 approaches the fixed plate 21. As the bearing cylinder 15 continues to rotate, the right teeth on the right end of each gear 24 mesh with the right teeth on the right tooth set 39. The gear 24 drives the first screw 23 to rotate and drives the movable plate 27 to move away from the fixed plate 21. The movable plate 27 drives the bellows 28 to extend, and the outside gas enters the bellows 28 through the second one-way valve 33 and the air guide pipe 34; each heat dissipation group During the rotation of the bearing cylinder 15, air is intermittently blown onto the corresponding first magnet to remove heat from the first magnet 19 and the second magnet, thus ensuring the magnetic stability of the first magnet 19 and the second magnet. During the rotation of the active cylinder, the first magnet 19 on the active cylinder attracts the second magnet 6 on the driven cylinder with opposite poles or repels it with like poles, thereby driving the driven cylinder 10 to rotate. The second magnet 6 on the driven cylinder 10 is fixed by the mounting block 29 and the second connecting ring 18, which can improve the connection between the second magnet 6 and the driven cylinder 10.

[0049] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Any equivalent or similar modifications or substitutions to the technical solutions of the invention without departing from the spirit of the invention or the scope of disclosure shall fall within the protection scope of the present invention.

Claims

1. A transmission comprising an electric machine (3) and a reduction gear (11), characterized in that, The magnetic coupling further comprises a driving cylinder and a driven cylinder (10), the driving cylinder comprises a bearing cylinder (15), a heat dissipation assembly and a first magnet (19), the heat dissipation assembly comprises a mounting hole (26), a heat dissipation piece and a driving ring (5), the inner wall of the bearing cylinder (15) is provided with the mounting hole (26), the mounting hole (26) is provided with the heat dissipation piece, the heat dissipation piece comprises a fixed plate (21), a movable plate (27), a first screw rod (23) and a gas guide pipe (34), the fixed plate (21) is fixedly connected in the mounting hole (26), the fixed plate (21) is provided with a first check valve (35), the inner end of the first screw rod (23) is rotatably connected with the fixed plate (21), the outer end of the first screw rod (23) penetrates through the outer peripheral wall of the bearing cylinder (15) and is fixedly connected with a gear (24), the movable plate (27) is threadedly connected with the outer periphery of the first screw rod (23) in the mounting hole (26), the movable plate (27) and the fixed plate (21) are connected with a bellows (28), one end of the gas guide pipe (34) extends into the bellows (28) and the other end is communicated with a second check valve (33) on the outer peripheral wall of the bearing cylinder (15), the driving ring (5) is sleeved on the outside of the bearing cylinder (15) and is provided with an annular groove (31) on the inner ring surface of the driving ring (5), the annular groove (31) is provided with a plurality of left tooth groups (22) on the left side surface thereof, and each right tooth group (39) is arranged on the right side surface of the annular groove (31) between every two adjacent left tooth groups (22). The bearing cylinder (15) is fixedly connected with a first connecting ring (7) on the right side thereof, the bearing cylinder (15) is provided with the first magnet (19) opposite to the mounting hole (26) and connected with the first connecting ring (7) on the right end thereof, and the first magnet (19) is in contact with the bearing cylinder (15) through a convex rib (20); the left part of the driven cylinder (10) extends into the bearing cylinder (15) and is connected with a second magnet (6) opposite to the first magnet (19) in the inside and outside thereof. The bearing cylinder (15) is connected with the motor (3) on the left side thereof, and the right side surface of the driven cylinder (10) is connected with the speed reducer (11).

2. A transmission according to claim 1, characterised in that The left tooth group (22) is composed of a plurality of left teeth arranged along the circumferential direction of the driving ring (5), and the right tooth group (39) is composed of a plurality of right teeth arranged along the circumferential direction of the driving ring (5).

3. A transmission according to claim 1, wherein, When each gear (24) and the left tooth group (22) are in a left-right opposite state, the teeth on the left end of each gear (24) are engaged with the left teeth on the left tooth group (22), and when each gear (24) and the right tooth group (39) are in a left-right opposite state, the teeth on the right end of each gear (24) are engaged with the right teeth on the right tooth group (39).

4. A transmission according to claim 3, wherein The distance between the left tooth group (22) and the adjacent right tooth group (39) is greater than the dedendum circle diameter of the gear (24).

5. A transmission according to claim 4, wherein ​ 6. A transmission according to claim 1, wherein, The first magnet (19) is fixedly connected with convex beads (20) at both ends of the outer side, two positioning grooves (36) are arranged between every two adjacent mounting holes (26) respectively, the two positioning grooves (36) are inclined in opposite directions away from the two mounting holes (26), the structure that the two positioning grooves (36) are arranged at both sides of each mounting hole (26) is formed, the outer ends of the two positioning grooves (36) at both sides of each mounting hole (26) penetrate the inner wall of the bearing cylinder (15), and correspond to the two sides of the adjacent first magnet (19) respectively, the positioning grooves (36) are arranged in the axial direction of the bearing cylinder (15), and the right end of the positioning groove (36) penetrates the right side of the bearing cylinder (15).

7. A transmission according to claim 6, wherein A positioning plate (32) is arranged in each positioning groove (36), the right end of the positioning plate (32) is fixedly connected to the side wall of the first connecting ring (7) close to the inner ring, the left end of the positioning plate (32) is flush with the left end of the adjacent first magnet (19), and the outer end of each positioning plate (32) extends out of the inner wall of the bearing cylinder (15) and is fixedly connected to the convex bead end portion at both ends of the adjacent first magnet (19).

8. A transmission according to claim 7, characterised in that The projection area of the first magnet (19) on the horizontal plane surrounds the sectional area of the mounting hole (26), the first magnet (19) is an arc-shaped plate with an arc-shaped protrusion facing the inner wall of the bearing cylinder (15), the second magnet (6) is an arc-shaped plate body corresponding to the outer wall of the driven cylinder (10), and the convex bead (20) is an arc-shaped rod body with the same center as the first magnet (19), the second magnet (6), the bearing cylinder (15) and the driven cylinder (10).

9. A transmission according to claim 1, wherein, The driven cylinder (10) is arranged with dovetail grooves (30) with a wide inner end and a narrow outer end in the left part of the outer peripheral wall, a plurality of the dovetail grooves (30) are arranged in the inner and outer positions of the first magnet (19), the left end of each dovetail groove (30) penetrates the left side of the driven cylinder (10), and a mounting block (29) corresponding to the dovetail groove (30) is arranged in each dovetail groove (30), and the outer side of each mounting block (29) is fixedly connected with a second magnet (6).

10. A transmission according to claim 9, wherein A plurality of the mounting blocks (29) are connected with a second connecting ring (18) at the left end, and the second connecting ring (18) is fixedly connected to the left side of the driven cylinder (10).

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