Electric running machine uses outer rotor brushless motor riveting transmission structure

Abstract

The utility model relates to outer rotor motor technical field discloses a riveting transmission structure of outer rotor brushless motor for electric treadmill, including outer rotor casing and the end cap of setting in the end part of outer rotor casing, the end part of outer rotor casing exceeds the end face of end cap and exceeds the portion and forms the limit rivet point abutting to the outer end face of end cap through riveting cutting inwards bending, the outer end face of end cap is equipped with the limit rotation clamping groove of rivet point jointing for preventing end cap and outer rotor casing from generating relative rotation, the riveting transmission structure of outer rotor brushless motor for electric treadmill of the utility model, the limit rivet point of inwards bending can carry out axial location to the end cap on outer rotor casing, and the jointing cooperation between limit rivet point and limit rotation clamping groove can play the effect of limiting rotation, thereby effectively improving the connection stability between end cap and outer rotor casing. The limit rivet point formed through riveting cutting can improve the processing efficiency and the utilization rate of outer rotor casing raw material, thereby reducing the production cost.

Description

Technical Field

[0001] This utility model relates to the field of external rotor motor technology, and in particular to the riveting transmission structure of an external rotor brushless motor for an electric treadmill. Background Technology

[0002] like Figure 1 The diagram shows the structure of a conventional fixed-shaft external rotor motor, which mainly includes an external rotor housing 1, a fixed shaft 17 disposed within the external rotor housing 1, two end covers 2 respectively disposed at the front and rear ends of the external rotor housing 1 and rotatably fitted onto the ends of the fixed shaft 17, and an armature 20 disposed on the axis of the fixed shaft 17. The specific working principle is as follows: After the motor is energized, the armature 20 can perform electromagnetic commutation under the action of the drive control to drive the external rotor housing 1 to rotate, thereby transferring the rotational torque to the two end covers 2, and then outputting power through the output shaft on the end covers 2.

[0003] In the aforementioned external rotor motor, both end caps 2 are fixed to the end faces of the external rotor housing 1 by a plurality of circumferentially arranged screws 24. In order to improve the fastening effect of the screws 24, it is necessary to increase the wall thickness of the external rotor housing 1. This will not only increase the cost of raw materials and the weight of the motor, but also increase the rotational inertia of the external rotor, resulting in increased energy consumption of the motor. Therefore, further improvements are needed. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a riveting transmission structure for an external rotor brushless motor in an electric treadmill. This structure ensures the connection strength between the end cap and the external rotor housing while effectively reducing the wall thickness of the external rotor housing, thereby minimizing the impact of wall thickness.

[0005] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0006] A riveting transmission structure for an external rotor brushless motor used in an electric treadmill includes an external rotor housing and an end cap disposed at the end of the external rotor housing. The end of the external rotor housing extends beyond the end face of the end cap, and the extended portion is bent inward by riveting to form a limiting rivet point that abuts against the outer end face of the end cap. The outer end face of the end cap is provided with a rotation limiting groove for the limiting rivet point to engage and prevent relative rotation between the end cap and the external rotor housing.

[0007] Using the above solution, the inwardly bent limiting rivets can axially limit the end cover on the outer rotor housing. The snap-fit ​​between the limiting rivets and the rotation-limiting slots can limit rotation, thereby effectively improving the connection stability between the end cover and the outer rotor housing. The limiting rivets formed by riveting improve processing efficiency and the utilization rate of raw materials for the outer rotor housing, thus effectively reducing production costs. Compared with traditional end cover connection methods, this structure saves on screw material and installation costs, and eliminates the need to consider the wall thickness of the outer rotor housing during screw installation, allowing the outer rotor housing to be made thinner. This ensures the connection strength between the end cover and the outer rotor housing while reducing the weight of the outer rotor motor and lowering its operating power consumption.

[0008] Preferably, the limiting rivet is pressed radially onto the outer end face of the end cap.

[0009] By adopting the above scheme, the limiting rivet is pressed radially onto the outer end face of the end cap, which can increase the contact area between the limiting rivet and the end cap, thereby effectively improving the fastening force of the limiting rivet.

[0010] Preferably, multiple limiting rivets are provided, and the multiple limiting rivets are arranged circumferentially along the end face of the outer rotor housing.

[0011] By adopting the above scheme, multiple limiting points can be formed at the end of the outer rotor housing on the outer end face of the end cover, thereby effectively improving the connection strength and balance between the end cover and the outer rotor housing.

[0012] As a preferred option, the rotation limit slot is provided with multiple slots and is engaged with multiple limit rivet points one by one.

[0013] By adopting the above scheme, the corresponding snap-fit ​​between multiple limiting rivets and multiple limiting slots can increase the limiting force between the end cover and the outer rotor housing, thereby further improving the efficiency and accuracy of torque transmission by the outer rotor housing.

[0014] Preferably, the inner sidewall of the outer rotor housing is provided with a limiting protrusion ring, and the inner end face of the end cover is provided with a stepped ring groove for axial engagement of the limiting protrusion ring.

[0015] By adopting the above solution, the snap-fit ​​between the limiting protrusion and the stepped ring groove can effectively prevent the end cover from retracting into the outer rotor housing, further improving the connection stability of the end cover.

[0016] Preferably, there are two end covers, which are located at the front and rear ends of the outer rotor housing.

[0017] With the above solution, the two end caps cover the front and rear ends of the outer rotor housing respectively, which can effectively improve the protection performance of the outer rotor motor, while ensuring the balance and stability of the outer rotor during operation.

[0018] Preferably, one end cover is provided with a power output component for outputting the rotational torque generated by the outer rotor housing, and the outer end face of the other end cover is provided with a boss and a receiving annular groove is formed between the boss and the portion of the outer rotor housing that extends beyond the end cover, and a counterweight ring is provided in the receiving annular groove.

[0019] Using the above solution, when a load is mounted on the power output component, the unilateral force on the external rotor motor increases. By installing a counterweight ring on the other end cover, the dynamic balance of the external rotor motor can be effectively achieved, thus making the motor operation more stable. The formed accommodating ring groove effectively increases the connection stability of the counterweight ring. At this time, the part of the external rotor housing protruding from the end cover can act as a barrier to prevent the counterweight ring from being thrown out.

[0020] Preferably, the power output component is a first pulley, which is connected to a second pulley via a belt drive. The second pulley is connected to the power input end of the treadmill conveyor belt.

[0021] By adopting the above solution, the torsional force of the external rotor motor can be efficiently transmitted to the treadmill conveyor belt, thereby improving the treadmill's operating performance.

[0022] Preferably, the treadmill conveyor belt includes a front-mounted active roller and a driven roller, with an annular running belt wound around the active roller and the driven roller, and the active roller being coaxially connected to a second pulley.

[0023] By adopting the above scheme, the torsional force of the second pulley can be efficiently transferred to the drive roller on the treadmill conveyor belt, thereby effectively improving the transfer efficiency.

[0024] Preferably, the treadmill conveyor belt is installed inside a running platform, and the upper surface of the running platform has an installation groove for accommodating the circular running belt. Both the driving roller and the driven roller are rotatably installed in the installation groove.

[0025] The above solution allows the treadmill conveyor belt to be stably installed inside the running platform.

[0026] This utility model, by adopting the above technical solution, has significant technical effects: the inwardly bent limiting rivets can axially limit the end cover on the outer rotor housing, and the snap-fit ​​between the limiting rivets and the rotation-limiting slots can limit rotation, thereby effectively improving the connection stability between the end cover and the outer rotor housing. The limiting rivets formed by riveting improve processing efficiency and the utilization rate of raw materials for the outer rotor housing, thus effectively reducing production costs. Compared with traditional end cover connection methods, the above structure saves on screw material and installation costs, and eliminates the need to consider the wall thickness of the outer rotor housing during screw installation, allowing the outer rotor housing to be made thinner. This ensures the connection strength between the end cover and the outer rotor housing while reducing the weight of the outer rotor motor and lowering the motor's operating power consumption. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a conventional shaft-fixed external rotor motor.

[0028] Figure 2 This is a schematic diagram of the structure of this embodiment. Figure 1 ;

[0029] Figure 3 for Figure 2 An enlarged schematic diagram of part A shown;

[0030] Figure 4 This is a schematic diagram of the structure of this embodiment. Figure 2 ;

[0031] Figure 5 for Figure 4 An enlarged schematic diagram of part B is shown below;

[0032] Figure 6 This is a schematic diagram of the structure of this embodiment. Figure 3 ;

[0033] Figure 7 for Figure 6 An enlarged schematic diagram of section C is shown;

[0034] Figure 8 This is a schematic diagram of the structure of this embodiment. Figure 4 ;

[0035] Figure 9 for Figure 8 An enlarged schematic diagram of part D is shown below;

[0036] Figure 10 for Figure 8 An enlarged schematic diagram of part E shown;

[0037] Figure 11 for Figure 8 An enlarged schematic diagram of part F shown.

[0038] The parts referred to by the numbers in the above attached figures are as follows: 1. Outer rotor housing; 2. End cover; 3. Limiting rivet point; 4. Rotation limiting groove; 5. Limiting protrusion ring; 6. Stepped ring groove; 7. First pulley; 8. Boss; 9. Accommodating ring groove; 10. Counterweight ring; 11. Second pulley; 12. Drive roller; 13. Driven roller; 14. Circular running belt; 15. Running platform; 16. Mounting groove; 17. Fixed shaft; 18. Mounting cavity; 19. Bearing; 20. Armature; 21. First bearing seat; 22. Second bearing seat; 23. Third bearing seat; 24. Screw. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0040] like Figures 2 to 11 As shown in this embodiment, a riveting transmission structure for an external rotor brushless motor used in an electric treadmill includes a cylindrical thin external rotor housing 1 and a circular end cap 2 disposed at the end of the external rotor housing 1. Two end caps 2 are provided, covering the front and rear ports of the external rotor housing 1 respectively. The outer circumferential surface of the end cap 2 abuts against the inner circumferential surface of the external rotor housing 1. Simultaneously, the end of the external rotor housing 1 extends beyond the corresponding outer end face of the end cap 2, and the extended portion is bent inward through riveting to form a limiting rivet 3 that abuts against the outer end face of the end cap 2. The limiting rivet 3 is radially pressed against the outer end face of the end cap 2. Six limiting rivets 3 are provided, arranged circumferentially at equal intervals along the end face of the external rotor housing 1. A rotation-limiting groove 4 is provided on the outer end face of the end cap 2 for the limiting rivets 3 to engage, preventing relative rotation between the end cap 2 and the external rotor housing 1. The rotation limiting slot 4 is also provided with six slots, which are connected one-to-one with the six limiting rivets 3, thereby realizing the rotation limitation between the end cover 2 and the outer rotor housing 1.

[0041] To secure the external rotor motor, a fixed shaft 17 is installed inside the external rotor housing 1. Both ends of the fixed shaft 17 are rotatably mounted through two end covers 2. Each end cover 2 has an inner cavity 18 for mounting bearings 19. The two ends of the fixed shaft 17 are fixedly mounted through the inner rings of the two bearings 19, thus ensuring the stability and smooth operation of the external rotor motor. An armature 20 is mounted on the axis of the fixed shaft 17, thereby enabling the operation control of the external rotor.

[0042] To prevent the end cap 2 from shrinking inward, the inner wall fixing ring of the outer rotor housing 1 is provided with two limiting protrusions 5, which are located near the two ends of the outer rotor housing 1. Each end cap 2 has a stepped annular groove 6 on its inner end face for axial engagement with the corresponding limiting protrusion 5.

[0043] To achieve power output from the external rotor motor, a power output component is coaxially fixed on one end cover 2 to output the rotational torque generated by the external rotor housing 1, and a fixed shaft 17 rotates through the power output component. A cylindrical boss 8 is integrally formed at the center of the outer end face of the other end cover 2, and a receiving annular groove 9 is formed between the boss 8 and the portion of the external rotor housing 1 extending beyond the end cover 2. A counterweight ring 10 is disposed within the receiving annular groove 9, preferably filled with dynamic balancing putty. In this case, the portion of the external rotor housing 1 extending beyond the end cover 2 acts as a barrier, preventing the dynamic balancing putty from being thrown out during the operation of the external rotor motor.

[0044] To achieve power connection between the external rotor motor and the treadmill, the power output component is a first pulley 7 coaxially fixed to the center of the end cover 2. The first pulley 7 is connected to a second pulley 11 via a belt (not shown). The second pulley 11 is coaxially fixed to the power input end of the treadmill conveyor belt. The connection method between the belt (not shown), the first pulley 7, and the second pulley 11 is common knowledge in the field and will not be described in detail here.

[0045] In this embodiment, the treadmill conveyor belt is installed within a running platform 15. Specifically, the upper surface of the running platform 15 has a mounting groove 16. The treadmill conveyor belt includes a front-mounted drive roller 12 and a rear-mounted driven roller 13. An annular running belt 14 is wound around the drive roller 12 and the driven roller 13. The drive roller 12 is coaxially fixed to the second pulley 11. Both ends of the drive roller 12 are fixed to both sides of the mounting groove 16 via first bearing seats 21, and both ends of the driven roller 13 are fixed to both sides of the mounting groove 16 via second bearing seats 22. An external rotor motor is installed within the mounting groove 16 near the drive roller 12. Both ends of the fixed shaft 17 are fixed to the bottom of the mounting groove 16 via third bearing seats 2319, thereby securing the external rotor motor.

[0046] The specific working principle is as follows:

[0047] After the external rotor motor is powered on, the armature 20 on the fixed shaft 17 can perform electromagnetic commutation under the action of electronic control to drive the external rotor to rotate, thereby driving the end cover 2 on the external rotor housing 1 to rotate, and then transferring the torsional force sequentially to the first pulley 7, the belt (not shown), the second pulley 11 and the drive roller 12 on the treadmill conveyor belt, thereby driving the treadmill conveyor belt to run.

[0048] During this process, the engagement between the end cap 2 and the limiting rivet 3 and the limiting protrusion 5 restricts the axial position of the end cap 2 on the outer rotor housing 1. The snap-fit ​​engagement between the limiting rivet 3 and the rotation limiting groove 4 restricts the circumferential position of the end cap 2 on the outer rotor housing 1, thereby effectively improving the connection stability between the end cap 2 and the outer rotor housing 1.

Claims

1. A riveting transmission structure for an external rotor brushless motor in an electric treadmill, comprising an external rotor housing (1) and an end cap (2) disposed at the end of the external rotor housing (1), characterized in that: The end of the outer rotor housing (1) extends beyond the end face of the end cover (2), and the extended part is bent inward by riveting to form a limiting rivet point (3) that abuts against the outer end face of the end cover (2). The outer end face of the end cover (2) is provided with a rotation limiting groove (4) for the limiting rivet point (3) to engage and prevent the end cover (2) from rotating relative to the outer rotor housing (1).

2. The riveting transmission structure for an external rotor brushless motor in an electric treadmill according to claim 1, characterized in that: The limiting rivet (3) is pressed radially onto the outer end face of the end cap (2).

3. The riveting transmission structure for an external rotor brushless motor in an electric treadmill according to claim 1, characterized in that: Multiple limiting rivet points (3) are provided, and the multiple limiting rivet points (3) are arranged circumferentially along the end face of the outer rotor housing (1).

4. The riveting transmission structure for an external rotor brushless motor in an electric treadmill according to claim 3, characterized in that: The limited rotation slot (4) is provided with multiple slots and is connected to multiple limit rivet points (3) one by one.

5. The riveting transmission structure for an external rotor brushless motor in an electric treadmill according to claim 1, characterized in that: The inner side wall of the outer rotor housing (1) is provided with a limiting protrusion ring (5), and the inner end face of the end cover (2) is provided with a stepped ring groove (6) for axial engagement of the limiting protrusion ring (5).

6. The riveting transmission structure for an external rotor brushless motor in an electric treadmill according to any one of claims 1 to 5, characterized in that: There are two end caps (2), which are located at the front and rear ends of the outer rotor housing (1).

7. The riveting transmission structure for an external rotor brushless motor in an electric treadmill according to claim 6, characterized in that: One end cover (2) is provided with a power output component for outputting the rotational torque generated by the outer rotor housing (1), and the outer end face of the other end cover (2) is provided with a boss (8) and a receiving annular groove (9) is formed between the boss (8) and the portion of the outer rotor housing (1) that extends beyond the end cover (2), and a counterweight ring (10) is provided in the receiving annular groove (9).

8. The riveting transmission structure for an external rotor brushless motor in an electric treadmill according to claim 7, characterized in that: The power output component is a first pulley (7), which is connected to a second pulley (11) via belt drive. The second pulley (11) is connected to the power input end of the treadmill conveyor belt.

9. The riveting transmission structure for an external rotor brushless motor in an electric treadmill according to claim 8, characterized in that: The treadmill conveyor belt includes a front drive roller (12) and a driven roller (13) arranged at the front and rear. A ring-shaped running belt (14) is wound around the drive roller (12) and the driven roller (13). The drive roller (12) is coaxially connected to the second pulley (11).

10. The riveting transmission structure for an external rotor brushless motor in an electric treadmill according to claim 9, characterized in that: The treadmill conveyor belt is installed in a running platform (15). The upper surface of the running platform (15) is provided with a mounting groove (16) for accommodating the circular running belt (14). The driving roller (12) and the driven roller (13) are both rotatably installed in the mounting groove (16).

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