Outer rotation brushless motor assembly structure of walking and running machine

Abstract

The utility model relates to the technical field of motors, and particularly discloses a walking and running machine outward-rotating brushless motor assembly structure, which comprises an outward-rotating motor, the outward-rotating motor comprises a front cover, a rear cover, a cylinder and a plurality of magnetic tile pieces accommodated in the cylinder, and the plurality of magnetic tile pieces are arranged around the central axis of the cylinder; the cylinder is clamped between the front cover and the rear cover, the two ends, close to the front cover and the rear cover, of the cylinder are provided with internal threads respectively, the front cover and the rear cover are provided with external threads respectively, the front cover and the rear cover are installed in cooperation with the internal threads at the two ends of the cylinder through the external threads, and the magnetic tile piece, the front cover, the rear cover and the cylinder are fixed together to form an outer rotor. A stable outer rotor motor structure is formed through screw-thread fit, and long-time stable operation of the motor is realized in combination with an efficient heat dissipation system; meanwhile, by adopting the transmission device combining the speed reduction wheel and the rolling shaft, the stability and the reliability of power transmission are ensured, and the vibration and the noise are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular discloses an assembly structure of an outward-rotating brushless motor for a treadmill. Background Art

[0002] Running has become a popular fitness activity for people of all ages. When the weather is bad and people don't want to interrupt their exercise routine, treadmills become their preferred indoor running and fitness option. Treadmills have become an indispensable piece of fitness equipment, both in gyms and in many homes. The design of the external rotor motor assembly structure, as a core component of the treadmill, is crucial. Traditional external rotor motor assembly structures typically rely on threaded rods to simultaneously lock the housing and the front and rear end covers. The threaded rods must pass through the inner wall of the conductor, and gaps must be left between the magnetic materials to allow the screws to pass. However, this design causes the threaded rods to pass through the middle of the magnets, interfering with the natural flow of magnetic lines of force, which can cause electromagnetic noise and blunt torque in the motor. Furthermore, as a precision component, the motor must be assembled using threaded rods and then further secured with pressure to the end covers. This can damage the bearings and also risk deforming the overall structure. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the present invention aims to provide an assembly structure for an outward-rotating brushless motor of a treadmill.

[0004] To achieve the above-mentioned purpose, the utility model provides an outward-rotating brushless motor assembly structure for a treadmill, which includes an outward-rotating motor. The outward-rotating motor includes a front cover, a rear cover, a cylinder, and a plurality of magnetic tiles contained in the cylinder. The magnetic tiles are fixed to the inner side of the cylinder by glue. The cylinder is made of magnetic conductive material (such as cast iron, etc.), and the plurality of magnetic tiles are arranged around the central axis of the cylinder. The cylinder is clamped between the front cover and the rear cover, and the cylinder is respectively provided with internal threads at both ends close to the front cover and the rear cover. Both the front cover and the rear cover are provided with external threads. The front cover and the rear cover are installed by matching the external threads with the internal threads at both ends of the cylinder. The magnetic tiles, the front cover, the rear cover, and the cylinder are fixed together to form an outward rotor.

[0005] Both the front cover and the rear cover have a limiting ring and a convex ring formed by protruding from the limiting ring. The external thread is set on the outer side of the convex ring. The end of the limiting ring close to the convex ring is used to press on the end face of the cylinder to prevent the front cover or the rear cover from being over-installed into the cylinder.

[0006] The threaded connection between the front and rear covers and the cylinder, along with the arrangement of the magnetic tiles, creates a stable and compact overall structure, significantly improving the motor's stability and durability. The threaded connection between the cover and the cylinder avoids interference with the natural flow of magnetic flux, eliminating the complex fixing steps and additional components required in traditional assembly methods. This makes the assembly process simpler and more efficient, reducing manufacturing costs and time. Furthermore, by optimizing the design and streamlining the assembly process, this structure helps reduce material and manufacturing costs, making the product more competitive in the market.

[0007] The assembly structure also includes a shaft part that cooperates with the cylinder, a coil unit arranged on the shaft part and cooperates with the magnetic tile part, the front cover and the rear cover are rotatably arranged on the shaft part, and the magnetic tile part is rotatably arranged on the shaft part via the front cover and the rear cover.

[0008] The cylinder's inner sidewall is provided with multiple sets of blind grooves, arranged along its length. The magnetic tiles have positioning portions received within these blind grooves. This blind groove design facilitates effective positioning of the magnetic tiles, ensuring secure installation and improving the motor's overall stability and operating efficiency. Furthermore, the placement of the blind grooves along the length of the cylinder ensures smooth and consistent rotation of the magnetic tiles.

[0009] The magnetic tile comprises a main body, a positioning portion protruding from the main body, an arc-shaped end surface of the main body near the positioning portion, an outer diameter of the main body greater than that of the positioning portion, and an end surface of the main body near the positioning portion abutting the inner wall of the cylinder. A blind groove contains glue for bonding the positioning portion (and the end surface of the main body).

[0010] There are multiple ventilation holes on the front cover and the back cover, and blades are formed between adjacent ventilation holes. The ventilation holes are used to form heat dissipation channels when the motor rotates. When the motor rotates, the ventilation holes on the front cover bring in external air, and the ventilation holes on the back cover bring out internal hot air to achieve air circulation.

[0011] The blade has an air guiding inclined surface, and the width of the blade gradually decreases from the end of the blade away from the outer ring of the front cover or the outer ring of the rear cover to the end of the blade close to the outer ring of the front cover or the outer ring of the rear cover.

[0012] Carefully designed ventilation holes and blades on the front and rear covers create an efficient heat dissipation system. The blades gradually decrease in width from the end away from the outer ring to the end closer to it. This feature creates a stronger airflow guidance effect as air flows through the blades, more effectively drawing cool air into the motor and quickly exhausting hot air inside, achieving rapid air circulation and efficient heat dissipation.

[0013] The assembled structure further comprises a flat frame, two groups of rotating shafts rotatably arranged in the flat frame, an annular belt sleeved outside the two groups of rotating shafts, and a driving unit for driving the rotating shafts to rotate. The driving unit drives the rotating shafts to rotate, and the rotating shafts drive the annular belt sleeved outside the rotating shafts to roll to form a treadmill track.

[0014] The driving unit comprises a support seat, an outer rotating motor arranged on the support seat, and a transmission device used in cooperation with the outer rotating motor. The transmission device comprises a first speed reducer, a second speed reducer, a rotating bearing, and a rolling shaft rotatably arranged between the rotating bearing and the second speed reducer. The second speed reducer is arranged in parallel with the rotating bearing.

[0015] The transmission device is designed in combination of the speed reducers and the rolling shaft. The power is transmitted through the first annular belt between the first speed reducer and the second speed reducer, ensuring the stability and reliability of power transmission. Meanwhile, the rolling shaft is rotatably arranged between the rotating bearing and the second speed reducer, further enhancing the stability of power transmission and reducing vibration and noise.

[0016] The transmission device further comprises a first annular belt sleeved on the first speed reducer and the second speed reducer, and a second annular belt sleeved on the rolling shaft and the rotating shaft. The outer rotating motor drives the first speed reducer to rotate, and the first speed reducer transmits power to the second speed reducer via the first annular belt. The second speed reducer rotates in the same direction as the first speed reducer. The rolling shaft rotates together with the second speed reducer and the rotating bearing, driving the second annular belt sleeved on the rolling shaft and the rotating shaft to rotate. The rotation of the second annular belt drives the rotating shaft arranged in the flat frame to rotate, and the rotation of the rotating shaft drives the annular belt to roll, realizing the walking and running function.

[0017] The transmission device effectively transmits power through the first speed reducer and the second speed reducer and the first annular belt therebetween. This design not only ensures stable transmission of power, but also reduces the rotating speed and increases the torque through the design of the speed reducers, thereby meeting the demand for power output of devices such as treadmills. A second annular belt sleeved on the rolling shaft and the rotating shaft is also designed. This double annular belt design not only enhances the stability of power transmission, but also improves the durability of the entire transmission device by dispersing the load. The rotation of the second annular belt directly drives the rotation of the rotating shaft and the rolling of the annular belt, realizing the walking and running function. The design of the transmission device makes the connection between the components compact and reasonable, reducing the space occupation. At the same time, due to the simple and clear connection between the components, maintenance and repair become easier. When maintenance or replacement of components is needed, the problem can be located and solved faster.

[0018] The assembled structure further comprises a plate body mounted in the flat frame via fasteners. The annular belt is sleeved on the plate body. The fasteners are L-shaped supports, and a plurality of groups of fasteners are arranged at intervals on both sides of the flat frame. The plate body is detachably mounted in the flat frame via the fasteners.

[0019] The panels are fastened with multiple sets of L-shaped brackets, spaced apart on either side of the panel frame. This mounting method not only ensures stable support for the panels but also enhances the robustness of the entire assembly. The L-shaped brackets provide additional strength and rigidity, allowing the panels to withstand greater loads without deformation or damage. The use of L-shaped brackets as fasteners makes installation and removal of the panels relatively simple and quick. This design facilitates quick replacement or maintenance of the panels when necessary, reducing operational complexity and time costs.

[0020] Furthermore, the driving unit includes a bracket, an external rotating motor arranged on the bracket, and an annular belt. The output end of the external rotating motor is provided with a gear shaft. The annular belt is mounted on the gear shaft of the external rotating motor and the rotating shaft on the flat plate frame. The external rotating motor drives the gear shaft to rotate and drives the annular belt to rotate. The rotation of the annular belt drives the rotating shaft on the flat plate frame to rotate. The rotating shaft drives the annular belt mounted on the outside of the rotating shaft to roll to form a treadmill runway.

[0021] The beneficial effects of the utility model are as follows: the assembly structure of the external rotor brushless motor of the treadmill forms a stable external rotor motor structure through threaded cooperation, and combined with an efficient heat dissipation system, realizes long-term stable operation of the motor; at the same time, the transmission device composed of a reduction wheel and a rolling shaft is adopted to ensure the stability and reliability of power transmission, and reduce vibration and noise; in addition, the compact and easy-to-maintain assembly structure design makes the connection of various components reasonable, easy to repair, and realizes effective use of space, reduces costs, and improves overall performance and market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an exploded view of the outer rotor motor of the present utility model;

[0023] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 3 This is a schematic structural diagram of the drive unit of the present utility model;

[0025] Figure 4 It is a cross-sectional view of the cylinder of the present utility model;

[0026] Figure 5 It is a structural schematic diagram of another embodiment of the driving unit of the present utility model.

[0027] Reference numerals include:

[0028] 1. External rotating motor; 2. Front cover; 3. Rear cover; 4. Cylinder; 5. Magnetic tile; 6. Internal thread; 7. External thread; 8. Shaft; 9. Coil unit; 11. Ventilation hole; 12. Blade; 13. Flat frame; 14. Rotating shaft; 15. Drive unit; 16. Annular belt; 17. Support seat; 18. Conveying device; 19. First reduction wheel; 21. Second reduction wheel; 22. Rotating bearing; 23. Rolling shaft; 24. First annular belt; 25. Second annular belt; 26. Plate; 27. Fastener; 28. Fastener; 29. ​​Limiting ring; 30. Conveying ring. DETAILED DESCRIPTION

[0029] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0030] See also Figures 1 to 5 As shown, the utility model discloses an outward-rotating brushless motor assembly structure for a treadmill, including an outward-rotating motor 1. The outward-rotating motor 1 includes a front cover 2, a rear cover 3, a cylinder 4, and a plurality of magnetic tiles 5 contained in the cylinder 4. The magnetic tiles 5 are fixed to the inner side of the cylinder 4 by glue. The cylinder 4 is made of a magnetic conductive material (such as cast iron, etc.), and a plurality of magnetic tiles 5 are arranged around the central axis of the cylinder 4. The cylinder 4 is clamped between the front cover 2 and the rear cover 3. The cylinder 4 is provided with internal threads 6 at both ends close to the front cover 2 and the rear cover 3, and the front cover 2 and the rear cover 3 are provided with external threads 7. The front cover 2 and the rear cover 3 are installed in conjunction with the internal threads 6 at both ends of the cylinder 4 via the external threads 7. The magnetic tiles 5, the front cover 2, the rear cover 3 and the cylinder 4 are fixed together to form an outward rotor.

[0031] In this embodiment, both the front cover 2 and the rear cover 3 have a limiting ring 29 and a convex ring 30 protruding from the limiting ring 29. The external thread 7 is arranged on the outer side of the convex ring 30. The end of the limiting ring 29 close to the convex ring 30 is used to press on the end face of the cylinder 4 to prevent the front cover 2 or the rear cover 3 from being over-installed into the cylinder 4.

[0032] The threaded fit between the front and rear covers 2 and 3 and the cylinder 4, along with the arrangement of the magnetic tiles 5, creates a stable and compact overall structure, significantly improving the motor's stability and durability. This structure avoids the complex fixing steps and additional components required in traditional assembly methods, making the assembly process simpler and more efficient, reducing manufacturing costs and time. Furthermore, by optimizing the design and streamlining the assembly process, this structure helps reduce material and manufacturing costs, making the product more competitive in the market.

[0033] The assembly structure also includes a shaft part 8 that cooperates with the cylinder 4, a coil unit 9 arranged on the shaft part 8 and cooperates with the magnetic tile part 5, the front cover 2 and the rear cover 3 are rotatably set on the shaft part 8, and the magnetic tile part 5 is rotatably set on the shaft part 8 via the front cover 2 and the rear cover 3.

[0034] The inner side wall of the cylinder 4 is provided with a plurality of groups of blind grooves 28, which are arranged along the length direction of the cylinder 4, and the magnetic tile 5 has a positioning part accommodated in the blind grooves 28. Through the design of the blind grooves on the inner side wall of the cylinder 4, the blind grooves 28 are beneficial to effectively limit the magnetic tile 5, realize the stable installation of the magnetic tile 5, and improve the overall stability and operation efficiency of the motor. At the same time, the arrangement of the blind grooves 28 along the length direction of the cylinder 4 ensures the stability and consistency of the magnetic tile 5 during rotation.

[0035] In this embodiment, the magnetic tile 5 has a body part, and the positioning part is protruded from the body part. The end face of the end of the body part close to the positioning part is arc-shaped. The outer diameter of the body part is larger than that of the positioning part. The end face of the end of the body part close to the positioning part abuts against the inner wall of the cylinder 4. The blind grooves 28 contain glue for bonding the positioning part (and the end face of the body part).

[0036] The front cover 2 and the rear cover 3 are each provided with a plurality of ventilation holes 11, and a blade 12 is formed between adjacent two ventilation holes 11. The ventilation holes 11 are used to form a heat dissipation channel when the motor rotates. The ventilation holes 11 of the front cover 2 bring external air when the motor rotates, and the ventilation holes 11 of the rear cover 3 bring internal hot air to realize air circulation.

[0037] The blade 12 has a wind guide slope. From one end of the blade 12 away from the outer circle of the front cover 2 or the rear cover 3 to the other end of the blade 12 close to the outer circle of the front cover 2 or the rear cover 3, the width of the blade 12 gradually decreases.

[0038] Through the ventilation holes 11 and the blades 12 carefully designed on the front cover 2 and the rear cover 3, an efficient heat dissipation system is constructed. From one end away from the outer circle to the other end close to the outer circle, the width of the blade 12 gradually decreases. This feature makes the air flowing through the blade 12 produce a stronger air flow guiding effect, so that the external cold air can be more effectively introduced into the motor, and the internal hot air can be quickly discharged, realizing rapid circulation of air flow and efficient heat dissipation.

[0039] The assembly structure further includes a flat plate frame 13, two groups of rotating shafts 14 rotatably arranged in the flat plate frame 13, an annular belt 16 sleeved outside the two groups of rotating shafts 14, and a driving unit 15 for driving the rotating shafts 14 to rotate. The driving unit 15 drives the rotating shafts 14 to rotate, and the rotating shafts 14 drive the annular belt 16 sleeved outside the rotating shafts 14 to roll to form a treadmill track.

[0040] The driving unit 15 includes a support base 17, an outer rotating motor 1 arranged on the support base 17, and a transmission device 18 used in conjunction with the outer rotating motor 1. The transmission device 18 includes a first reduction wheel 19, a second reduction wheel 21, a rotating bearing 22, and a rolling shaft 23 rotatably arranged between the rotating bearing 22 and the second reduction wheel 21. The second reduction wheel 21 is arranged parallel to the rotating bearing 22.

[0041] The design of the transmission device 18 utilizes a combination of a reduction gear and a rolling shaft 23. Power is transmitted via a first endless belt 24 between the first reduction gear 19 and the second reduction gear 21, ensuring stable and reliable power transmission. Furthermore, the rotational arrangement of the rolling shaft 23 between the rotating bearing 22 and the second reduction gear 21 further enhances the smoothness of power transmission and reduces vibration and noise.

[0042] The transmission device 18 also includes a first ring belt 24 mounted on the first reduction wheel 19 and the second reduction wheel 21, and a second ring belt 25 mounted on the rolling shaft 23 and the rotating shaft 14. The outer rotary motor 1 drives the first reduction wheel 19 to rotate, and the first reduction wheel 19 transmits power to the second reduction wheel 21 via the first ring belt 24. The second reduction wheel 21 rotates in the same direction as the first reduction wheel 19; the rolling shaft 23 rotates together with the second reduction wheel 21 and the rotating bearing 22 to drive the second ring belt 25 mounted on the rolling shaft 23 and the rotating shaft 14 to rotate. The rotation of the second ring belt 25 drives the rotating shaft 14 set in the flat frame 13 to rotate, and the rotation of the rotating shaft 14 drives the ring belt 16 to roll to realize the exercise function of walking and running.

[0043] The conveyor 18 achieves efficient power transmission through a first reduction wheel 19, a second reduction wheel 21, and a first endless belt 24 between them. This design not only ensures stable power transmission but also reduces rotational speed and increases torque through the reduction wheel design, thus meeting the power output requirements of equipment such as treadmills. A second endless belt 25 is also designed, which is mounted on the rolling shaft 23 and the rotating shaft 14. This dual-belt design not only enhances the stability of power transmission but also improves the durability of the entire conveyor 18 by distributing the load. The rotation of the second endless belt 25 directly drives the rotating shaft 14 and the endless belt 16 to rotate, achieving the walking and running motion. The design of the conveyor 18 ensures compact and rational connections between various components, reducing space usage. Furthermore, the simple and clear connections between components make maintenance and repair easier. When maintenance or component replacement is required, problems can be located and resolved more quickly.

[0044] The assembly structure also includes a plate 26, which is mounted within the flat panel frame 13 via fasteners 27. The annular belt 16 is sleeved onto the plate 26. The fasteners 27 are L-shaped brackets, and there are multiple sets of fasteners 27, spaced apart on both sides of the flat panel frame 13. The plate 26 is detachably mounted within the flat panel frame 13 via the fasteners 27.

[0045] The panel 26 is secured to the flat panel frame 13 on both sides by multiple sets of L-shaped brackets serving as fasteners 27. This mounting method not only ensures stable support for the panel 26 but also enhances the robustness of the entire assembly. The L-shaped brackets provide additional strength and rigidity, allowing the panel 26 to withstand greater loads without deformation or damage. The use of L-shaped brackets as fasteners 27 makes installation and removal of the panel 26 relatively simple and quick. This design facilitates quick replacement or maintenance of the panel 26 when necessary, reducing operational complexity and time costs.

[0046] In another embodiment, the driving unit 15 includes a bracket 100, an external rotary motor 1 arranged on the bracket 100, and an annular belt 200. The output end of the external rotary motor 1 is provided with a gear shaft 300. The annular belt 200 is sleeved on the gear shaft 300 of the external rotary motor 1 and the rotating shaft 14 on the flat plate frame 13. The external rotary motor 1 drives the gear shaft 300 to rotate and drives the annular belt 200 to rotate. The rotation of the annular belt 200 drives the rotating shaft 14 on the flat plate frame 13 to rotate. The rotating shaft 14 drives the annular belt 16 sleeved on the outside of the rotating shaft 14 to roll to form a treadmill runway.

[0047] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A treadmill external-rotation brushless motor assembly structure, characterized by: The invention comprises an external rotor motor (1), which comprises a front cover (2), a rear cover (3), a cylinder (4) and a plurality of magnetic tiles (5) contained in the cylinder (4), wherein the plurality of magnetic tiles (5) are arranged around the central axis of the cylinder (4); the cylinder (4) is clamped between the front cover (2) and the rear cover (3); the two ends of the cylinder (4) close to the front cover (2) and the rear cover (3) are respectively provided with internal threads (6); the front cover (2) and the rear cover (3) are both provided with external threads (7); the front cover (2) and the rear cover (3) are mounted in conjunction with the internal threads (6) at the two ends of the cylinder (4) via the external threads (7); the magnetic tiles (5), the front cover (2), the rear cover (3) and the cylinder (4) are fixed together to form an external rotor.

2. The treadmill external-rotation brushless motor assembly structure according to claim 1, characterized in that: The assembly structure further includes a shaft member (8) matched with the cylinder (4), a coil unit (9) arranged on the shaft member (8) and matched with the magnetic tile member (5), the front cover (2) and the rear cover (3) are rotatably arranged on the shaft member (8), and the magnetic tile member (5) is rotatably arranged on the shaft member (8) via the front cover (2) and the rear cover (3).

3. The treadmill external-rotation brushless motor assembly structure according to claim 1, characterized in that: The inner side wall of the cylinder (4) is provided with a plurality of groups of blind grooves (28), the blind grooves (28) are arranged along the length direction of the cylinder (4), and the magnetic tile (5) is provided with a positioning portion accommodated in the blind grooves (28).

4. The treadmill external-rotation brushless motor assembly structure according to claim 1, characterized in that: The front cover (2) and the rear cover (3) are both provided with a plurality of ventilation holes (11), and blades (12) are formed between two adjacent ventilation holes (11). The ventilation holes (11) are used to form heat dissipation channels when the motor rotates. When the motor rotates, the ventilation holes (11) of the front cover (2) bring in external air, and the ventilation holes (11) of the rear cover (3) bring out internal hot air to achieve air circulation.

5. The treadmill external-rotation brushless motor assembly structure according to claim 4, characterized in that: The blade (12) has an air guiding inclined surface, and the width of the blade (12) gradually decreases from one end of the blade (12) away from the outer ring of the front cover (2) or the outer ring of the rear cover (3) to the other end of the blade (12) close to the outer ring of the front cover (2) or the outer ring of the rear cover (3).

6. The treadmill external-rotation brushless motor assembly structure according to claim 1, characterized in that: The assembly structure further comprises a flat frame (13), two groups of rotating shafts (14) rotatably arranged in the flat frame (13), an annular belt (16) sleeved outside the two groups of rotating shafts (14), and a driving unit (15) for driving the rotating shafts (14) to rotate. The driving unit (15) drives the rotating shafts (14) to rotate, and the rotating shafts (14) drive the annular belt (16) sleeved outside the rotating shafts (14) to roll to form a treadmill runway.

7. The treadmill external-rotation brushless motor assembly structure according to claim 6, characterized in that: The driving unit (15) comprises a support seat (17), an outer rotating motor (1) arranged on the support seat (17), and a transmission device (18) used in conjunction with the outer rotating motor (1); the transmission device (18) comprises a first reduction wheel (19), a second reduction wheel (21), a rotating bearing (22), and a rolling shaft (23) rotatably arranged between the rotating bearing (22) and the second reduction wheel (21); the second reduction wheel (21) and the rotating bearing (22) are arranged in parallel.

8. The treadmill external-rotation brushless motor assembly structure according to claim 7, characterized in that: The transmission device (18) further comprises a first ring belt (24) sleeved on the first reduction wheel (19) and the second reduction wheel (21) and a second ring belt (25) sleeved on the rolling shaft (23) and the rotating shaft (14); the outer motor (1) drives the first reduction wheel (19) to rotate, and the first reduction wheel (19) transmits power to the second reduction wheel (21) via the first ring belt (24); the second reduction wheel (21) rotates in the same direction as the first reduction wheel (19); the rolling shaft (23) rotates together with the second reduction wheel (21) and the rotating bearing (22) to drive the second ring belt (25) sleeved on the rolling shaft (23) and the rotating shaft (14) to rotate; the rotation of the second ring belt (25) drives the rotating shaft (14) arranged in the flat frame (13) to rotate; the rotation of the rotating shaft (14) drives the ring belt (16) to roll to realize the movement function of walking and running.

9. The treadmill external-rotation brushless motor assembly structure according to claim 6, characterized in that: The assembly structure further comprises a plate body (26), the plate body (26) being mounted in the flat plate frame (13) via fasteners (27), and the annular belt (16) being sleeved on the plate body (26).

10. The treadmill external-rotation brushless motor assembly structure according to claim 6, characterized in that: The driving unit (15) comprises a bracket (100), an external rotating motor (1) arranged on the bracket (100), and an annular belt (200); the output end of the external rotating motor (1) is provided with a gear shaft (300); the annular belt (200) is sleeved on the gear shaft (300) of the external rotating motor (1) and a rotating shaft (14) on a flat frame (13); the external rotating motor (1) drives the gear shaft (300) to rotate, thereby driving the annular belt (200) to rotate; the rotation of the annular belt (200) drives the rotating shaft (14) on the flat frame (13) to rotate; the rotating shaft (14) drives the annular belt (16) sleeved on the outside of the rotating shaft (14) to roll to form a treadmill runway.

Images