A DC brushless motor for a shock-absorbing and noise-free treadmill

Abstract

The present invention relates to the technical field of DC brushless motors, and particularly to a DC brushless motor for a shock-absorbing and noise-free treadmill, which includes a motor housing, a motor front end cover, and a motor rear end cover. A rotor is fixedly connected to the inner wall of the motor housing. A stator is provided between the motor front end cover and the motor rear end cover. A stator shaft is fixedly connected in the middle of the stator. Both ends of the stator shaft pass through the motor front end cover and the motor rear end cover respectively. The motor front end cover includes a front bearing fixing seat and an outer edge body. A wind blade is further provided between the front bearing fixing seat and the outer edge body. The motor rear end cover has the same structure as the motor front end cover. A clamping groove is formed in the stator shaft, and a snap ring is clamped in the clamping groove. A corrugated spring washer is further provided between the snap ring and the rear bearing. A gasket is further provided between the corrugated spring washer and the snap ring, solving the problems of how the motor automatically opens and closes the ventilation structure and the large vibration and noise generated after adopting the automatic opening and closing ventilation structure.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current brushless motors, and particularly to a direct current brushless motor for a shock-absorbing and noise-free treadmill. Background Art

[0002] An electric treadmill is a high-grade equipment for gyms and families. It drives a running belt through a motor to make people run or walk passively at different speeds. Since it forms running and walking passively, in terms of the action appearance, it is almost the same as ordinary running or walking on the ground. However, in terms of human effort, running and walking on an electric treadmill saves a pushing and stretching action compared to ordinary running and walking. This makes everyone who walks or runs on an electric treadmill feel very relaxed and comfortable. It allows people to run about 1 / 3 more distance than ordinary running, and the energy consumption is also more than ordinary walking and running.

[0003] The motors used in existing treadmills are direct current brushless motors with an outer rotor form, including a motor housing, a front end cover and a rear end cover located at both ends of the motor housing. An outer rotor is fixed on the inner wall of the motor housing. There is a stator inside the outer rotor. The stator shaft is fixedly connected to the front end cover and the rear end cover. The design of the flywheel can be omitted through the form of the outer rotor. This kind of treadmill with such a motor can be directly connected to the belt drive without adding a flywheel. The structure is simplified, the work is stable, and the torque output is stable. For example, the Chinese utility model document with the patent literature number CN207652175U discloses an outer rotor motor and a treadmill. The outer rotor motor includes an inner stator, an outer rotor, a front cover and a rear cover provided at both ends of the outer rotor. The inner stator is fixed on the installation shaft. The front cover and the rear cover are rotatably sleeved on the installation shaft. Both ends of the installation shaft extend outwards through the front cover and the rear cover respectively. There is a gap between the outer rotor and the inner stator. A plurality of openings are provided on the front cover and the rear cover to communicate with the gap to form a cooling and heat dissipation air duct. Another example is the Chinese utility model document with the patent literature number CN215733773U, which discloses an outer rotor motor, including a housing, a front end cover, a rear end cover and a rotating shaft; a first installation stop is provided at the front end of the housing for cooperating with the front end cover, and a second installation stop is provided at the rear end for cooperating with the rear end cover. A plurality of magnets are evenly spaced on the inner wall of the housing; the front end cover cooperates with the housing and abuts against the first installation stop. At least part of the front end cover is located inside the housing, and a wind blade and a ventilation groove are provided on the part of the front end cover located outside the housing; the rear end cover cooperates with the housing and abuts against the second installation stop, and ventilation holes are provided on the rear end cover; a stator cooperating with the magnets is provided on the rotating shaft, and the rotating shaft passes through the front end cover and the rear end cover.

[0004] Although the above-mentioned electric motor adopting the outer rotor form eliminates the counterweight flywheel, has stable torque output, simplified structure, stable operation, and is provided with ventilation structures on the front and rear end covers, which can remove the heat generated by the motor during operation through air convection, these ventilation structures are open, that is, when the motor is not started, external dust, hair and other debris will enter the motor with the flow of air and be adsorbed on the surface of the rotor and stator, increasing the burden on the motor rotor, resulting in increased energy consumption of the motor and increased heat generated during operation. Moreover, as the dust, hair and other debris adsorbed on the surface of the rotor and stator inside the motor increase, its heat dissipation capacity will decrease, its service life will be reduced, and in severe cases, the internal stator winding coil will be burned out. Therefore, we need to improve the ventilation of the motor. The structure is improved by setting the end cover into a fan shape and setting the fan blades therein to be rotatable, so that the ventilation structure can be opened when the motor is started and air convection can be formed inside and outside the motor to dissipate heat. When not started, the ventilation structure can be closed to separate the inside and outside of the motor to prevent external dust, dander and other debris from entering the motor with the flow of air. Due to the use of a movable fan blade structure, there is a gap between the fan blade and the outer edge of the end cover. The fan blade will move radially when the end cover rotates, causing the centripetal force center of the end cover to shift when the end cover rotates, causing the motor housing and the end cover to move radially, and the fan blade is subjected to the reverse air force when the end cover rotates, causing the motor housing and the end cover to move axially, thereby causing the vibration and noise of the motor to be large during operation, affecting the application of the motor. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a shock-absorbing and noise-free DC brushless motor for a treadmill, which solves the problems existing in the prior art. The device solves the problem of how the motor automatically opens and closes the ventilation structure and the high vibration and noise generated after the automatic opening and closing of the ventilation structure is adopted.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solution: A DC brushless motor for a shock-absorbing and noise-free treadmill, comprising a motor housing, a motor front end cover and a motor rear end cover fixedly connected to both ends of the motor housing. A rotor is fixedly connected to the inner wall of the motor housing. A front bearing is provided in the middle of the motor front end cover, and a rear bearing is provided in the middle of the motor rear end cover. A stator is provided between the motor front end cover and the motor rear end cover. A Hall plate is provided on one side of the stator. A stator shaft is fixedly connected to the middle of the stator. Both ends of the stator shaft pass through the motor front end cover and the motor rear end cover respectively. A pulley is fixedly connected to the side of the motor front end cover away from the motor housing. The motor front end cover includes a front bearing fixing seat in the middle thereof and an outer edge body at its outer edge. A plurality of fan blades are further provided between the front bearing fixing seat and the outer edge body. The fan blades are fan-shaped. A fan blade activity groove is provided on the outer circular surface of the front bearing fixing seat, and an outer wing activity groove is provided on the inner circular side wall of the outer edge body. The fan blade activity groove and the outer wing activity groove are corresponding in position. A plurality of connecting shafts are fixedly connected between the fan blade activity groove and the outer wing activity groove. The connecting shafts pass through the middle of the fan blades. The fan blades rotate about the connecting shafts. The motor rear end cover has the same structure as the motor front end cover. A clamping groove is provided on the stator shaft near the front bearing, and a clamping groove is provided on the stator shaft near the rear bearing. A snap ring is clamped in the clamping groove. A wave spring washer is further provided between the snap ring and the rear bearing, and a gasket is further provided between the wave spring washer and the snap ring.

[0009] Preferably, a fan blade outer wing is fixedly connected to the middle of the outer circular surface of the fan blade. The fan blade outer wing is smaller than the arc length of the outer edge of the fan blade. A rotation hole is provided in the middle of the fan blade, and the rotation hole passes through the fan blade outer wing. A top block activity groove is provided on the inner wall of the outer wing activity groove, and the top block activity groove is inclined. The inclination direction of the top block activity groove is between two fan blade outer wings and the number is corresponding to the fan blades. A top block spring is provided at the intersection of the top block activity groove and the side wall of the outer wing activity groove close to the stator. One end of the top block spring is fixedly connected to the side wall of the outer wing activity groove close to the stator, and the other end of the top block spring is fixedly connected to a deflection top block. The deflection top block is slidably connected in the top block activity groove. The difference between the motor rear end cover and the motor front end cover is that the top block activity grooves of the two are symmetrically arranged.

[0010] Preferably, a limiting top rod is fixedly connected to the side of the fan blade away from the stator, and a fan blade spring is fixedly connected to the other side of the fan blade opposite to the limiting top rod.

[0011] Preferably, when the fan blade is parallel to the side wall of the fan blade activity groove away from the stator, the distance between them is the same as the length of the limiting top rod.

[0012] Preferably, the width of the fan blade activity groove is smaller than the width at both ends of the inner arc length of the fan blade, and the width of the outer wing activity groove is smaller than the width at both ends of the outer arc length of the fan blade.

[0013] Preferably, the deflection top block is in the shape of a right trapezoid.

[0014] Preferably, a plurality of connecting rods are fixedly connected between the front bearing fixing seat and the outer edge body near the side of the motor housing, and the connecting rods are evenly distributed in a ring shape.

[0015] Preferably, the gasket is in a circular ring shape, the outer diameter of its outer edge is larger than the outer diameter of the corrugated spring washer, and the gasket is made of a metal material.

[0016] Preferably, the rotor is a strip-shaped permanent magnet, and the strip-shaped permanent magnet is composed of two identical short permanent magnets.

[0017] Preferably, a wiring groove is provided at one end of the stator shaft close to the rear end cover of the motor.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention provides a DC brushless motor for a shock-absorbing and noise-free treadmill, wherein the device is provided with a fan blade between a bearing fixing seat and an outer edge body of an end cover, a fan blade movable groove is provided on an outer circumferential surface of the bearing fixing seat, an outer wing movable groove is provided on an inner circumferential surface of the outer edge body, the fan blade is rotatably connected through a connecting shaft fixed between the fan blade movable groove and the outer wing movable groove, a fan blade outer wing is provided on the fan blade, an inclined top block movable groove is provided on an inner wall of the outer wing movable groove, the inclination direction of the top block movable groove is between two fan blade outer wings, a top block spring is provided in the top block movable groove, one end of the top block spring is fixedly connected to a side wall of the outer wing movable groove close to a stator, the other end of the top block spring is fixedly connected to a deflecting top block, the deflecting top block is slidably connected in the top block movable groove, and the fan blade is rotatably connected to a side wall of the outer wing movable groove close to a stator. A limiting top rod is arranged on the side, and a blade spring is arranged on the other side of the fan blade opposite to the limiting top rod. When the fan blade is parallel to the side wall of the fan blade movable groove away from the stator, the distance between the two is the same as the length of the limiting top rod. With the above structure, when the motor starts to rotate, the motor rotor and the end cover rotate instantly. Due to the effect of inertia, the deflection top block has not time to rotate with the end cover, which causes relative sliding between the deflection top block and the top block movable groove, that is, the deflection top block slides along the top block movable groove toward between the two adjacent outer wings of the fan blades, and the acute angle of the right-angled trapezoidal deflection top block deflects the two outer wings of the fan blades. The corresponding two fan blades are subjected to unilateral force and rotate around the connecting shaft until they are parallel. Multiple fan blades rotate at the same time to form a fan shape, so that the rotating fan shape The fan blades can blow out or suck in air. Since the movable grooves of the top blocks of the front cover and the rear cover of the motor are symmetrically arranged, the front cover and the rear cover of the motor in rotation can suck in air and blow out air respectively, forming an air flow. The air flow can flow through the inside of the motor, suck in cold air and blow out hot air, thereby cooling the motor, thereby realizing self-cooling of the motor and opening the fan blades to form a fan state. Among them, the deflecting top block slides obliquely along the movable groove of the top block toward between the outer wings of two adjacent fan blades, so that after the fan blades are opened, the fan blade spring at one end of the fan blade is compressed. Since the air resistance encountered by the fan blade is perpendicular to the side wall of the fan blade, the air resistance and the thrust generated by the compression of the fan blade spring interact with each other. Therefore, the fan blade will not deflect when the deflecting top block is removed. The fan state of the fan blades is maintained; when the deflected top block slides along the top block movable groove toward the outer wings of two adjacent fan blades, the top block spring is gradually stretched and the pulling force gradually increases. When the inertial force is less than the spring pulling force, the deflected top block slides back and stabilizes at the initial position when the motor rotates at a uniform speed, thereby realizing the automatic resetting of the deflected top block; when the motor stops rotating, the air resistance disappears, the fan blade spring at one end of the compressed fan blade is stretched, and the fan blade is pushed to rotate in the opposite direction with the connecting shaft as the axis, and the limiting top rod arranged opposite to the fan blade spring presses against the side wall of the top block movable groove, and the fan blade is fixed by force on both sides. At this time, all the fan blades are parallel to the side wall of the fan blade movable groove, and all the fan blades form a sealed plane, thereby realizing the dust-proof effect when the motor is not started.

[0021] 2. The present invention provides a DC brushless motor for a shock-absorbing and noise-free treadmill. By arranging a wave spring washer between the bearing and the circlip clamped on the bearing, the bearing can be axially fixed and subjected to a pre-tightening force, so that the contacts between both of them and the wave spring washer are elastic contacts, preventing the axial movement of the motor housing and the end cover; by arranging a metal gasket between the wave spring washer and the circlip clamped on the bearing, the contact area with the wave spring washer can be increased, the friction force between the two can be increased, preventing the radial movement of the motor housing and the end cover, and also being able to eliminate the deflection and movement problems caused by the non-contact between the opening of the circlip and the wave spring washer. Therefore, adopting the above structure can reduce the axial and radial movement of the motor, thereby reducing the vibration and noise generated during the operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the overall shape of the present invention.

[0023] Figure 2 It is a schematic structural diagram of the overall sectional view of the present invention.

[0024] Figure 3 For the present invention Figure 2 It is a schematic structural diagram of the enlarged view at position B in the present invention.

[0025] Figure 4 For the present invention Figure 2 It is a schematic structural diagram of the enlarged view at position A in the present invention.

[0026] Figure 5 It is a schematic structural diagram of the stator shaft of the present invention.

[0027] Figure 6 It is a schematic structural diagram of the circlip of the present invention.

[0028] Figure 7 It is a schematic structural diagram of the gasket of the present invention.

[0029] Figure 8 It is a schematic structural diagram of the wave spring washer of the present invention.

[0030] Figure 9 It is a schematic structural diagram of the front end cover of the motor of the present invention.

[0031] Figure 10 It is a schematic diagram of the position of the wind blade on the front bearing fixing seat of the present invention.

[0032] Figure 11 It is a schematic structural diagram of the outer edge body of the present invention.

[0033] Figure 12 It is a schematic structural diagram of the front bearing fixing seat of the present invention.

[0034] Figure 13This is a schematic three-dimensional structure diagram of the wind blade of the present invention.

[0035] Figure 14 This is a schematic plan structure diagram of the wind blade of the present invention.

[0036] Figure 15 This is a schematic structure diagram of the deflection top block of the present invention.

[0037] Figure 16 This is a schematic diagram of the position of the deflection top block in the wind blade mechanism of the present invention.

[0038] Figure 17 This is a schematic structure diagram of the connecting rod of the present invention.

[0039] In the figure: 1 - motor housing, 2 - motor front end cover, 3 - motor rear end cover, 4 - rotor, 5 - stator, 6 - front bearing fixing seat, 7 - front bearing, 8 - snap ring, 9 - rear bearing fixing seat, 10 - gasket, 11 - wave washer, 12 - stator shaft, 13 - Hall plate, 14 - connecting rod, 15 - wind blade, 16 - connecting shaft, 17 - card slot, 18 - wiring groove, 19 - outer edge body, 20 - pulley, 21 - outer wing movable groove, 22 - top block movable groove, 23 - deflection top block, 24 - top block spring, 25 - wind blade movable groove, 26 - wind blade outer wing, 27 - rotation hole, 28 - limit ejector rod, 29 - wind blade spring, 30 - rear bearing. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the attached Figure 1-17 It is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment: A direct current brushless motor for a shock-absorbing and noise-free treadmill, comprising a motor housing 1, a motor front end cover 2 and a motor rear end cover 3 fixedly connected to both ends of the motor housing 1. The motor housing 1 is a hollow cylinder. A rotor 4 is fixedly connected to the inner wall of the motor housing 1. The rotor 4 is a bar magnet, and the bar magnet is composed of two identical short magnets. A front bearing 7 is provided in the middle of the motor front end cover 2, and a rear bearing 30 is provided in the middle of the motor rear end cover 3. A stator 5 is provided between the motor front end cover 2 and the motor rear end cover 3. The stator 5 includes a stator winding. A Hall plate 13 is provided on one side of the stator 5. A stator shaft 12 is fixedly connected to the middle of the stator 5. A wiring groove 18 is provided at one end of the stator shaft 12 close to the motor rear end cover 3. Wiring through the wiring groove 18 is simple and convenient. Both ends of the stator shaft 12 pass through the motor front end cover 2 and the motor rear end cover 3 respectively. A pulley 20 is fixedly connected to the side of the motor front end cover 2 away from the motor housing 1. A clamping groove 17 is provided on the stator shaft 12 close to the front bearing 7, and a clamping groove 17 is provided on the stator shaft 12 close to the rear bearing 30. A snap ring 8 is clamped in the clamping groove 17 for positioning the stator 5. A wave washer 11 is further provided between the snap ring 8 and the rear bearing 30. By providing the wave washer 11, the front bearing 7 and the rear bearing 30 can be axially fixed and receive a pre-tightening force, so that the contact between both of them and the wave washer 11 is elastic contact, preventing axial movement of the motor housing 1, the motor front end cover 2 and the motor rear end cover 3. A gasket 10 is further provided between the wave washer 11 and the snap ring 8. The gasket 10 is made of a metal material and is in a circular ring shape. By providing the metal gasket 10, the contact area with the wave washer 11 can be increased, the friction force between the two can be increased, preventing radial movement of the motor housing 1, the motor front end cover 2 and the motor rear end cover 3, and also eliminating the deflection and movement problems caused by the non-contact between the opening of the snap ring 8 and the wave washer 11. The outer diameter of the outer edge of the gasket 10 is larger than the outer diameter of the wave washer 11. If the outer diameter of the outer edge of the gasket 10 is smaller than the outer diameter of the wave washer 11, the outer edge part of the wave washer 11 is not stressed, resulting in uneven elastic force of the wave washer 11 on the front bearing 7 and the rear bearing 30, and the wave washer 11 loses its elastic force after deformation. The motor front end cover 2 includes a front bearing fixing seat 6 in the middle thereof and an outer edge body 19 at its outer edge. A plurality of connecting rods 14 are fixedly connected between the front bearing fixing seat 6 and the outer edge body 19 close to the side of the motor housing 1. The connecting rods 14 are evenly distributed in a ring shape. A number of fan blades 15 are further provided between the front bearing fixing seat 6 and the outer edge body 19. The fan blades 15 are fan-shaped pieces obtained by dividing a circular ring into several equal parts. A fan blade moving groove 25 is provided on the outer circular surface of the front bearing fixing seat 6, and an outer wing moving groove 21 is provided on the inner circular side wall of the outer edge body 19. The fan blade moving groove 25 and the outer wing moving groove 21 are in corresponding positions. A plurality of connecting shafts 16 are fixedly connected between the fan blade moving groove 25 and the outer wing moving groove 21. The connecting shafts 16 pass through the middle of the fan blades 15. The fan blades 15 rotate around the connecting shafts 16 at an angle less than 45°.

[0042] The middle of the outer circular surface of the wind blade 15 is fixedly connected with a wind blade outer wing 26. The wind blade outer wing 26 is smaller than the arc length of the outer edge of the wind blade 15. A rotation hole 27 is opened in the middle of the wind blade 15, and the rotation hole 27 passes through the wind blade outer wing 26. A top block moving groove 22 is opened on the inner wall of the outer wing moving groove 21. The top block moving groove 22 is inclined. The inclined direction of the top block moving groove 22 is between two wind blade outer wings 26, and the number corresponds to that of the wind blades 15. At the intersection of the top block moving groove 22 and the side wall of the outer wing moving groove 21 close to the stator 5, there is a top block spring 24. One end of the top block spring 24 is fixedly connected with the side wall of the outer wing moving groove 21 close to the stator 5, and the other end of the top block spring 24 is fixedly connected with a deflection top block 23. The deflection top block 23 is in the shape of a right trapezoid and is slidably connected in the top block moving groove 22. A limiting top rod 28 is fixedly connected to the side of the wind blade 15 away from the stator 5, and a wind blade spring 29 is fixedly connected to the other side of the wind blade 15 opposite to the limiting top rod 28. When the wind blade 15 is parallel to the side wall of the wind blade moving groove 25 away from the stator 5, the distance between them is the same as the length of the limiting top rod 28. The widths of the wind blade moving groove 25 and the outer wing moving groove 21 are smaller than the width of the wind blade 15. The difference between the motor rear end cover 3 and the motor front end cover 2 is that the top block moving grooves 22 of the two are symmetrically arranged. During use, when the motor starts to rotate, the rotor 4 and the motor front end cover 2 rotate instantaneously. Due to inertia, the deflection top block 23 has not had time to rotate with the motor front end cover 2, which causes relative sliding between the deflection top block 23 and the top block moving groove 22, that is, the deflection top block 23 slides along the top block moving groove 22 obliquely towards the space between two adjacent wind blade outer wings 26. The acute angle of the right trapezoid-shaped deflection top block 23 pushes the two wind blade outer wings 26 to deflect. The corresponding two wind blades 15 rotate to be parallel with the connecting shaft 16 as the axis after being subjected to unilateral force. Multiple wind blades 15 perform the same operation simultaneously to form a fan shape, so that the rotating fan-shaped wind blades 15 can blow or suck air. Since the top block moving grooves 22 of the motor front end cover 2 and the motor rear end cover 3 are symmetrically arranged, it can make one of the rotating motor front end cover 2 and the motor rear end cover 3 suck air and the other blow air to form an air flow. The air flow can flow through the motor interior, suck in cold air and blow out hot air to air-cool the motor, thereby realizing the self-cooling of the motor and realizing the opening of the wind blades 15 to form a fan state; among them, when the deflection top block 23 slides along the top block moving groove 22 obliquely towards the space between two adjacent wind blade outer wings 26 and the wind blade 15 is opened, the wind blade spring 29 at one end of the wind blade 15 is compressed. Since the air resistance received by the wind blade 15 is perpendicular to the side wall of the wind blade 15, the air resistance and the thrust generated after the compression of the wind blade spring 29 act on each other. Therefore, the wind blade 15 will not deflect after the deflection top block 23 is removed, realizing the maintenance of the fan state of the wind blade 15;When the deflection top block 23 slides along the top block moving slot 22 obliquely towards the space between two adjacent outer wings 26 of the fan blades, the top block spring 24 is gradually stretched and the pulling force gradually increases. When the inertial force is less than the spring pulling force, the deflection top block 23 slides back and stabilizes at the initial position under the condition of the motor rotating at a constant speed, realizing the automatic reset of the deflection top block 23. After the motor stops rotating, the air resistance disappears, and the fan blade spring 29 at one end of the compressed fan blade 15 elongates, pushing the fan blade 15 to rotate reversely with the connecting shaft 16 as the axis. The limit ejector rod 28 arranged opposite to the fan blade spring 29 abuts against the side wall of the top block moving slot 22, and the fan blade 15 is fixed by the forces on both sides. At this time, all the fan blades 15 are parallel to the side wall of the fan blade moving slot 22, and all the fan blades 15 form a sealed plane, realizing the dust-proof function of the motor when it is not started.

[0043] With the above structure, when the motor starts, it can open the fan blades 15 and form air convection inside and outside the motor for heat dissipation. When the motor is not started, it can close the fan blades 15 to isolate the inside and outside of the motor to prevent external dust, lint and other sundries from entering the motor with the air flow. Moreover, by setting the corrugated spring washer 11, the front bearing 7 and the rear bearing 30 can be axially fixed and subjected to a pre-tightening force, so that the contacts between them and the corrugated spring washer 11 are all elastic contacts, preventing axial movement of the motor housing 1, the motor front end cover 2 and the motor rear end cover 3. By setting the metal gasket 10, the contact area with the corrugated spring washer 11 can be increased, the friction force between them can be increased, preventing radial movement of the motor housing 1, the motor front end cover 2 and the motor rear end cover 3, and also being able to eliminate the deflection and movement problems caused by the non-contact between the opening of the snap ring 8 and the corrugated spring washer 11, thereby being able to reduce the axial and radial movement of the motor and reduce the vibration and noise generated during the operation of the motor.

[0044] Working principle: When the motor starts to rotate, the rotor 4 and the front end cover 2 of the motor rotate instantaneously. Due to inertia, the deflection top block 23 has not had time to rotate with the front end cover 2 of the motor, which causes relative sliding between the deflection top block 23 and the top block movable groove 22, that is, the deflection top block 23 slides obliquely along the top block movable groove 22 between the outer wings 26 of two adjacent fan blades. The acute angle of the right trapezoid-shaped deflection top block 23 deflects the two outer wings 26 of the fan blades. After the corresponding two fan blades 15 are stressed unilaterally, they rotate around the connecting shaft 16 to be parallel. Multiple fan blades 15 perform simultaneously to form a fan shape, so that the rotating fan-shaped fan blades 15 can blow or suck in air. Since the top block movable grooves 22 of the front end cover 2 and the rear end cover 3 of the motor are symmetrically arranged, when the motor is rotating, the front end cover 2 and the rear end cover 3 of the motor can suck in air and blow out air respectively to form an air flow. The air flow can flow through the interior of the motor, suck in cold air and blow out hot air to air-cool the motor, thereby realizing the self-cooling of the motor and realizing the opening of the fan blades 15 to form a fan state; among them, when the deflection top block 23 slides obliquely along the top block movable groove 22 between the outer wings 26 of two adjacent fan blades, after the fan blades 15 are opened, the fan blade spring 29 at one end of the fan blade 15 is compressed. Since the air resistance received by the fan blade 15 is perpendicular to the side wall of the fan blade 15, the air resistance and the thrust generated after the compression of the fan blade spring 29 act on each other. Therefore, when the deflection top block 23 is removed, the fan blade 15 will not deflect, realizing the maintenance of the fan state of the fan blade 15; when the deflection top block 23 slides obliquely along the top block movable groove 22 between the outer wings 26 of two adjacent fan blades, the top block spring 24 is gradually stretched and the pulling force gradually increases. When the inertial force is less than the spring pulling force, the deflection top block 23 slides back and stabilizes at the initial position during the uniform rotation of the motor, realizing the automatic reset of the deflection top block 23; when the motor stops rotating, the air resistance disappears, and the fan blade spring 29 at the end of the compressed fan blade 15 elongates, pushing the fan blade 15 to rotate reversely around the connecting shaft 16. The limit top rod 28 arranged opposite to the fan blade spring 29 abuts against the side wall of the top block movable groove 22, and the two sides are stressed to fix the fan blade 15. At this time, all the fan blades 15 are parallel to the side wall of the fan blade movable groove 22, and all the fan blades 15 form a sealed plane, realizing the dust-proof function of the motor when it is not started.

[0045] By setting the wave spring washer 11, the front bearing 7 and the rear bearing 30 can be axially fixed and subjected to a pre-tightening force, so that the contacts between both of them and the wave spring washer 11 are elastic contacts, preventing axial movement of the motor housing 1, the motor front end cover 2 and the motor rear end cover 3; by setting the metal gasket 10, the contact area with the wave spring washer 11 can be increased, the friction force between the two can be increased, preventing radial movement of the motor housing 1, the motor front end cover 2 and the motor rear end cover 3, and also being able to eliminate the deflection and movement problems caused by the non-contact between the opening of the circlip 8 and the wave spring washer 11, so that the axial and radial movement of the motor can be reduced, and the vibration and noise generated during the operation of the motor can be reduced.

Claims

1. A DC brushless motor for a shock-absorbing and noise-free treadmill, comprising a motor housing, a motor front end cover and a motor rear end cover fixedly connected to both ends of the motor housing. A rotor is fixedly connected to the inner wall of the motor housing. A front bearing is provided in the middle of the motor front end cover, and a rear bearing is provided in the middle of the motor rear end cover. A stator is provided between the motor front end cover and the motor rear end cover. A Hall plate is provided on one side of the stator. A stator shaft is fixedly connected to the middle of the stator. Both ends of the stator shaft respectively pass through the motor front end cover and the motor rear end cover. A pulley is fixedly connected to the side of the motor front end cover away from the motor housing, characterized in that: The front end cover of the motor includes a front bearing fixing seat in the middle thereof and an outer edge body at its outer edge. A plurality of fan blades are provided between the front bearing fixing seat and the outer edge body. The fan blades are fan-shaped. A fan blade moving groove is provided on the outer cylindrical surface of the front bearing fixing seat. An outer wing moving groove is provided on the inner cylindrical side wall of the outer edge body. The fan blade moving groove and the outer wing moving groove are corresponding in position. A plurality of connecting shafts are fixedly connected between the fan blade moving groove and the outer wing moving groove. The connecting shafts pass through the middle of the fan blades. The fan blades rotate about the connecting shafts. The rear end cover of the motor has the same structure as the front end cover of the motor. A clamping groove is provided on the stator shaft near the front bearing. A clamping groove is provided on the stator shaft near the rear bearing. A snap ring is clamped in the clamping groove. A wave spring washer is further provided between the snap ring and the rear bearing. A gasket is further provided between the wave spring washer and the snap ring. A fan blade outer wing is fixedly connected to the middle of the outer cylindrical surface of the fan blade. The fan blade outer wing is smaller than the arc length of the outer edge of the fan blade. A rotation hole is provided in the middle of the fan blade. The rotation hole passes through the fan blade outer wing. A top block moving groove is provided on the inner wall of the outer wing moving groove. The top block moving groove is inclined. The inclined direction of the top block moving groove is between two fan blade outer wings and the number thereof corresponds to that of the fan blades. A top block spring is provided at the intersection of the top block moving groove and the side wall of the outer wing moving groove close to the stator. One end of the top block spring is fixedly connected to the side wall of the outer wing moving groove close to the stator. The other end of the top block spring is fixedly connected to a deflection top block. The deflection top block is slidably connected in the top block moving groove. The difference between the rear end cover of the motor and the front end cover of the motor is that the top block moving grooves of the two are symmetrically arranged. A limiting top rod is fixedly connected to the side of the fan blade away from the stator. A fan blade spring is fixedly connected to the other side of the fan blade opposite to the limiting top rod. The distance between the fan blade and the side wall of the fan blade moving groove away from the stator when the fan blade is parallel to the side wall is the same as the length of the limiting top rod. The width of the fan blade moving groove is smaller than the widths of both ends of the inner edge arc length of the fan blade. The width of the outer wing moving groove is smaller than the widths of both ends of the outer edge arc length of the fan blade. The deflection top block is in the shape of a right trapezoid. A plurality of connecting rods are fixedly connected between the front bearing fixing seat and the outer edge body near the motor housing side. The connecting rods are evenly distributed in a ring shape.

2. The DC brushless motor for a shock-absorbing and noise-free treadmill according to claim 1, wherein: The gasket is in the shape of a ring, and the outer diameter of its outer edge is larger than the outer diameter of the wave spring washer. The gasket is made of a metal material.

3. The DC brushless motor for a shock-absorbing and noise-free treadmill according to claim 1, characterized in that: The rotor is a strip-shaped permanent magnet, and the strip-shaped permanent magnet is composed of two identical short permanent magnets.

4. The DC brushless motor for a shock-absorbing and noise-free treadmill according to claim 1, characterized in that: A wiring groove is provided at one end of the stator shaft close to the rear end cover of the motor.

Images