Motor for treadmill

Abstract

The utility model relates to the technical field of motors, in particular to a motor for a treadmill. A motor for a treadmill comprises a casing, a front end cover and a rear end cover, the front end cover and the rear end cover are arranged at two ends of the casing, and a plurality of axially penetrating ventilation slots are arranged on end faces of the front end cover and the rear end cover. A stator assembly and a rotor assembly are arranged in the machine shell, the rotor assembly comprises a rotor shaft and a rotor iron core arranged on the rotor shaft in a sleeving mode, and a first fan which is arranged on the rotor shaft in a sleeving mode and achieves rotation through the rotor shaft is arranged between the rotor iron core and the front end cover. A second fan is arranged on the axial outer side of the rear end cover, the rotor shaft is sleeved with the second fan, and rotation of the second fan is achieved through the rotor shaft, or the rotor shaft is not sleeved with the second fan, and rotation of the second fan is achieved through an independent driver. The LED lamp has the advantage of being better in heat dissipation effect.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor for a treadmill. Background Art

[0002] Treadmills are common equipment in families and gyms. The operation of the running belt of a treadmill is achieved by a motor. The treadmill motor (hereinafter referred to as the motor) is the power source of the treadmill, and generally includes a motor housing, end covers provided at both ends of the motor housing, a stator, a rotor and a commutator provided inside the motor housing. Since the power of the treadmill motor is relatively large, a fan needs to be provided on the motor to accelerate the heat dissipation of the internal components of the motor. For example, Chinese Patent No. 201520632410.8 discloses a brushless motor with a built-in cooling fan. In this patent, a cooling fan is provided inside the front end cover of the motor, and the cooling fan rotates with the motor shaft. However, it is currently found that if only one fan is provided inside the treadmill motor, the heat dissipation is insufficient, resulting in overheating of the internal components of the motor and damage, causing the treadmill to malfunction. Summary of the Invention

[0003] In order to solve the deficiencies in the prior art, a motor for a treadmill with better heat dissipation effect is provided.

[0004] The utility model is realized by the following technical solutions: A motor for a treadmill includes a motor housing, a front end cover and a rear end cover provided at both ends of the motor housing. A plurality of axially penetrating ventilation grooves are provided on the end faces of the front end cover and the rear end cover; a stator assembly and a rotor assembly are provided inside the motor housing. The rotor assembly includes a rotor shaft and a rotor core sleeved on the rotor shaft. A first fan sleeved on the rotor shaft and rotating through the rotor shaft is provided between the rotor core and the front end cover; a second fan is provided on the axial outer side of the rear end cover. The second fan is sleeved on the rotor shaft and rotates through the rotor shaft, or the second fan is not sleeved on the rotor shaft and is rotated by an independent driver.

[0005] In actual driving of this solution, the rotation of the rotor shaft can drive the rotation of the first fan and the second fan at the same time, so that the first fan and the second fan dissipate heat from the internal components of the entire motor; or the rotation of the rotor shaft drives the rotation of the first fan alone, and the second fan is rotated by an external driver, so as to realize heat dissipation treatment for the internal components of the entire motor.

[0006] Among them, when the rotor shaft drives the first fan and the second fan to rotate synchronously, the rotor shaft and the first fan and the second fan can be tightly fitted, or there can be a key connection between them.

[0007] Among them, for the independent rotation of the second fan, its independent driver can be a motor with a relatively small volume directly driving the rotation of the second fan.

[0008] In this solution, ventilation grooves axially penetrating are provided on the end faces of the front end cover and the rear end cover, facilitating the flow of air in the motor housing when the first fan and the second fan start. At the same time, the second fan is provided and arranged axially outside the rear end cover to enhance the heat dissipation effect through the second fan, reducing the running stability of the motor components, thereby preventing the internal components of the motor from overheating.

[0009] Preferably, the second fan includes a second fan housing and a second fan blade located inside the second fan housing and rotatably connected to the second fan housing. A driver for driving the second fan blade to rotate is also provided inside the second fan housing. The second fan housing is coaxially arranged with the rear end cover and fixedly connected therebetween.

[0010] In this solution, by providing the second fan housing, which is coaxially arranged with and fixedly connected to the rear end cover, the driver enables the second fan blade of the second fan to rotate independently of the rotor shaft; and the independent rotation of the second fan allows the second fan to maintain a high-speed rotation when the treadmill motor is running at a low speed, thus achieving an efficient heat dissipation effect. Also, the driver is arranged inside the second fan housing, optimizing the size of the entire treadmill motor.

[0011] Preferably, a plurality of first connection parts are provided on the outer circumferential wall of the rear end cover at evenly spaced intervals and extending towards the second fan housing. The end of the first connection part extends axially outside the rear end cover. The first connection part is provided with an internal threaded hole. A plurality of second connection parts corresponding to the first connection parts are provided on the outer circumferential wall of the second fan housing. The second connection part is provided with a through hole, and a screw passes through the through hole and is in threaded cooperation with the internal threaded hole of the first connection part.

[0012] The connection between the second fan housing and the rear end cover is achieved through the first connection part, the second connection part, and the screw.

[0013] Preferably, a third fan is provided axially outside the front end cover. The third fan is sleeved on the rotor shaft and rotates through the rotor shaft.

[0014] By providing the third fan, the air exhaust efficiency can be further increased.

[0015] Preferably, the third fan includes a third fan housing and a third fan blade integrally formed with the third fan housing. The third fan blade is located at one end of the third fan housing deviating from the front end cover, and the end of the front end cover extends into the other end of the third fan housing.

[0016] The end of the front end cover extending into the other end of the third fan housing can reduce the axial length of the entire treadmill motor, making the structure more compact.

[0017] Preferably, the air outlet directions of the first fan, the second fan, and the third fan are the same.

[0018] The air outlet directions of the three fans are the same, which can further achieve the blowing of heat in a unified direction.

[0019] Preferably, the axial projections of the ventilation slots of the front end cover and the rear end cover coincide with each other.

[0020] The axial projections of the ventilation slots of the front end cover and the rear end cover coincide with each other, so that the ventilation slots of the front end cover and the rear end cover are not staggeredly arranged in the axial direction, making the ventilation smoother.

[0021] Preferably, the front end cover and the rear end cover are both provided with a plurality of connecting bars extending in the radial direction and arranged at equal intervals. The ventilation slots are formed between two adjacent connecting bars. At least two of the connecting bars are provided with fixing holes, and a fixing rod for fixing the front end cover and the rear end cover is arranged between the fixing holes of the front end cover and the fixing holes of the rear end cover.

[0022] By arranging the fixing holes for fixing the front end cover and the rear end cover on the connecting bars, the space of the ventilation slots will not be occupied, thus avoiding the ventilation of the entire motor. Among them, the cooperation between the fixing rod and the fixing hole can be achieved by screwing tightly with screws, fixing with glue, welding, riveting, etc.

[0023] Preferably, a plurality of evenly spaced magnetic steels are provided on the inner wall of the housing, and the fixing rod passes through the gap between two adjacent magnetic steels.

[0024] By passing the fixing rod through the gap between two adjacent magnetic steels, the internal structure of the entire motor becomes more compact, while optimizing the ventilation space and facilitating the heat dissipation of the motor.

[0025] Preferably, axially extending positioning protrusions are provided on the opposite surfaces of the front end cover and the rear end cover. A limiting groove for restricting the circumferential direction of the housing and a limiting protrusion extending into the limiting groove are provided between the positioning protrusion and the housing; when the housing is fixed to the front end cover and the rear end cover, the end faces of the housing are respectively in contact with the end faces of the front end cover and the rear end cover, and the inner wall of the housing is in contact and cooperation with the outer wall of the positioning protrusion.

[0026] By the contact between the outer wall of the positioning protrusion and the inner wall of the housing, the positioning of the housing in the axial and radial directions with respect to the front end cover and the rear end cover is achieved. At the same time, through the connection of the fixing rod, the housing is clamped between the front end cover and the rear end cover. There is no need to provide fixing structures such as screw holes on the housing, the structure is more compact, and there is no need to make the housing thick, thus facilitating the removal of heat; through the cooperation of the limiting groove and the limiting protrusion, the circumferential direction of the housing is limited.

[0027] Compared with the prior art, the utility model has the advantages of better heat dissipation effect, thus avoiding damage to the internal components of the motor due to overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of Embodiment 1;

[0029] Figure 2 is Figure 1 a cross-sectional view of;

[0030] Figure 3 is Figure 1 a schematic structural diagram after removing the machine shell;

[0031] Figure 4 is a schematic structural diagram at the rear end cover;

[0032] Figure 5 is a schematic structural diagram at the rear end cover;

[0033] Figure 6 is a schematic structural diagram of Embodiment 2.

[0034] Figure 7 is Figure 6 a cross-sectional view of.

[0035] Figure 8 is a schematic structural diagram of Embodiment 3.

[0036] Figure 9 is Figure 8 a cross-sectional view of.

[0037] Reference numerals in the drawings: 1. Machine shell; 11. Rotor shaft; 12. Rotor core; 13. Permanent magnet; 14. Bearing; 15. Insulating end plate; 2. Front end cover; 21. Connecting strip; 22. Ventilation groove; 23. Fixing hole; 3. Rear end cover; 31. First connecting part; 4. First fan; 5. Second fan; 51. Second fan housing; 52. Second fan blade; 53. Second connecting part; 6. Third fan; 61. Third fan housing; 62. Third fan blade; 7. Fixed rod; 8. Positioning protrusion; 81. Limiting groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following further describes the utility model with reference to the drawings and specific embodiments.

[0039] Embodiment 1

[0040] As shown in Figure 1 and Figure 2As shown in the figure, Embodiment 1 of the present disclosure discloses a motor for a treadmill, which includes a housing 1, a front end cover 2 and a rear end cover 3 located at the front and rear ends of the housing 1. A rotor assembly and a stator assembly are provided inside the housing 1. The rotor assembly includes a rotor shaft 11 and a rotor core 12 sleeved on the rotor shaft 11 and rotating synchronously with the rotor shaft. Both the front end cover 2 and the rear end cover 3 are provided with axially extending bearing chambers, and bearings 14 are provided in the bearing chambers. The bearings 14 are sleeved on the rotor shaft 11 to realize the rotational connection between the rotor shaft 11 and the front end cover 2 and the rear end cover 3. The stator assembly includes two permanent magnets 13, and the permanent magnets 13 are adhered to the inner wall of the housing 1 by glue.

[0041] As Figures 1 to 5 shown, positioning protrusions 8 extending axially are provided on the opposite surfaces of the front end cover 1 and the rear end cover 3. The cross-sectional shape of the positioning protrusion 8 is circular. Two radially penetrating and axially open limiting grooves 81 are provided on the wall of the positioning protrusion 8 of the rear end cover 3. The two limiting grooves 81 are radially symmetrically arranged. A limiting protrusion (not shown in the figure) extending radially to extend into the limiting groove 81 is provided on the inner wall of the housing 1. The cooperation between the limiting groove 81 and the limiting protrusion limits the circumferential position of the housing 1; when the housing 1 is fixed to the front end cover 2 and the rear end cover 3, the end faces of the housing 1 are respectively in contact with the end faces of the front end cover 2 and the rear end cover 3, and the inner wall of the housing 1 is in contact and cooperation with the outer wall of the positioning protrusion 8.

[0042] As Figure 2 、 Figure 3 and Figure 5 shown, the front end cover 2 and the rear end cover 3 are both provided with a plurality of connecting strips 21 extending radially and evenly spaced in the circumferential direction. The ends of the connecting strips 21 are all connected to and integrally provided with the outer wall of the bearing chamber. An axially penetrating ventilation groove 22 is formed between two adjacent connecting strips 21. The axial projections of the ventilation grooves 22 of the front end cover 2 and the rear end cover 3 coincide with each other. Fixing holes 23 are provided on two connecting strips 21 of the front end cover 2 and the rear end cover 3, and the two connecting strips 21 are radially symmetrically arranged. A fixing rod 7 passes through the fixing hole 23. The end of the fixing rod 7 has a threaded structure and is threadedly engaged with the fixing hole 23 of the front end cover 2 to realize the fixation of the front end cover 2, the rear end cover 3 and the housing 1. A space for the fixing rod 7 to pass through is formed between the two permanent magnets 13.

[0043] As Figure 1 、 Figure 2 、 Figure 3 and Figure 5As shown in the figure, an insulating end plate 15 sleeved on the rotor shaft 11 is provided at the end of the rotor core 12 close to the front end cover 2. A first fan 4 is also provided between the rotor core 12 and the front end cover 2. One end of the first fan 4 is sleeved on the rotor shaft 11 and rotates through the rotor shaft 11, and the end of the first fan 4 contacts the end of the insulating end plate 15 to limit the axial position of the first fan 4. There is an interference fit between the first fan 4 and the rotor shaft 11. A second fan 5 is provided on the axial outer side of the rear end cover 3. The second fan 5 does not contact the rotor shaft 11, and the second fan 5 rotates through an independent driver (not shown in the figure). Among them, the driver is also any existing small motor that can realize the rotation of the fan.

[0044] The second fan 5 includes a second fan housing 51 and a second fan blade 52 located inside the second fan housing 51 and rotatably connected to the second fan housing 51. A driver (not shown in the figure) for driving the second fan blade 52 to rotate is also provided inside the second fan housing 51. The second fan housing 51 is coaxially arranged with the rear end cover 3. A plurality of first connecting portions 31 are provided on the circumferential outer wall of the rear end cover 3 at uniform intervals and extending toward the second fan housing 51. The end of the first connecting portion 31 extends out of the axial outer side of the rear end cover 3. The first connecting portion 31 is provided with an internal threaded hole. A plurality of second connecting portions 53 corresponding to the first connecting portions 31 are provided on the circumferential outer wall of the second fan housing 51. The second connecting portion 53 is provided with a through hole (not shown in the figure). A screw (not shown in the figure) passes through the through hole and is in threaded cooperation with the internal threaded hole of the first connecting portion 31. Among them, the wind directions of the first fan 4 and the second fan 5 are the same.

[0045] During actual use, the rotor shaft 11 drives the first fan 4 to rotate, and the second fan 5 rotates by self-driving through its own driver. The wind will pass through the ventilation slot 22 of the rear end cover 3 to enter the casing 1, and the heat in the casing 1 will be taken out and flow out from the ventilation slot 22 of the front end cover 2 at the other end.

[0046] Embodiment 2

[0047] As Figure 6 and Figure 7 shown, the difference between Embodiment 2 and Embodiment 1 is that: a third fan 6 is provided on the axial outer side of the front end cover 2. The third fan 6 is sleeved on the rotor shaft 11. The third fan 6 has an interference fit with the rotor shaft 11 and rotates through the rotor shaft 11. The third fan 6 includes a third fan housing 61 and a third fan blade 62 integrally formed with the third fan housing 61. The third fan blade 62 is located at one end of the third fan housing 61 deviating from the front end cover 2. The end of the bearing chamber of the front end cover 2 extends into the other end of the third fan housing 61. Among them, the wind directions of the first fan 4, the second fan 5, and the third fan 6 are the same.

[0048] During actual use, the third fan 6 rotates synchronously with the first fan 4, thereby further increasing the heat dissipation efficiency.

[0049] Example 3

[0050] As Figure 8 and Figure 9 shown, the difference between Example 3 and Example 2 is that: both the second fan housing 51 and the second fan blade 52 of the second fan 5 are integrally provided. The second fan 5 is sleeved on the rotor shaft 11. A plane is milled at the end of the rotor shaft 11, and the rotor shaft 11 drives the second fan 5 to rotate.

[0051] In actual use, the first fan 4, the second fan 5, and the third fan 6 all achieve synchronous rotation through the rotor shaft 11, thereby achieving heat dissipation.

Claims

1. A motor for a treadmill, comprising a housing and a front end cover and a rear end cover arranged at both ends of the housing, characterized in that: On the end faces of the front end cover and the rear end cover, there are a number of axially penetrating ventilation grooves; inside the machine shell, there are a stator assembly and a rotor assembly. The rotor assembly includes a rotor shaft and a rotor core sleeved on the rotor shaft. Between the rotor core and the front end cover, there is a first fan sleeved on the rotor shaft and rotated by the rotor shaft. On the axial outer side of the rear end cover, there is a second fan. The second fan is sleeved on the rotor shaft and rotated by the rotor shaft, or the second fan is not sleeved on the rotor shaft and is rotated by an independent driver.

2. The motor for treadmill according to claim 1, characterized in that: The second fan includes a second fan cover body and second fan blades located inside the second fan cover body and rotatably connected to the second fan cover body. Inside the second fan cover body, there is also the driver for driving the second fan blades to rotate. The second fan cover body is coaxially arranged with the rear end cover and fixedly connected between them.

3. The motor for treadmill according to claim 1 or 2, characterized in that: On the circumferential outer wall of the rear end cover, there are a number of first connecting parts evenly spaced and extending towards the second fan cover body side. The end of the first connecting part extends out to the axial outer side of the rear end cover. The first connecting part is provided with an internal threaded hole. On the circumferential outer wall of the second fan cover body, there are a number of second connecting parts corresponding to the first connecting parts. The second connecting part is provided with a through hole, and a screw passes through the through hole and is in threaded cooperation with the internal threaded hole of the first connecting part.

4. The motor for treadmill according to claim 1, characterized in that: On the axial outer side of the front end cover, there is a third fan. The third fan is sleeved on the rotor shaft and rotated by the rotor shaft.

5. The motor for treadmill according to claim 4, wherein: The third fan includes a third fan cover body and third fan blades integrally formed with the third fan cover body. The third fan blades are located at one end of the third fan cover body deviating from the front end cover, and the end of the front end cover extends into the other end of the third fan cover body.

6. The motor for treadmill according to claim 4 or 5, characterized in that: The air outlet directions of the first fan, the second fan, and the third fan are the same.

7. The motor for a treadmill according to claim 1, characterized in that: The axial projections of the ventilation grooves of the front end cover and the rear end cover coincide with each other.

8. The motor for a treadmill according to claim 1 or 7, characterized in that: Both the front end cover and the rear end cover are provided with a number of connecting bars extending in the radial direction and evenly spaced. The space between two adjacent connecting bars forms the ventilation groove. At least two of the connecting bars are provided with fixing holes, and between the fixing holes of the front end cover and the rear end cover, there is a fixing rod for fixing the front end cover and the rear end cover.

9. The motor for treadmill according to claim 8, characterized in that: On the inner wall of the machine shell, there are a number of evenly spaced permanent magnets, and the fixing rod passes through the gap between two adjacent permanent magnets.

10. The motor for treadmill according to claim 1, characterized in that: On the opposite faces of the front end cover and the rear end cover, there are axially extending positioning protrusions. Between the positioning protrusions and the machine shell, there are a limiting groove for restricting the circumferential direction of the machine shell and a limiting protrusion extending into the limiting groove; when the machine shell is fixed to the front end cover and the rear end cover, the end faces of the machine shell are respectively in contact with the end faces of the front end cover and the rear end cover, and the inner wall of the machine shell is in contact and cooperation with the outer wall of the positioning protrusion.

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