A brushless motor

Abstract

The present invention provides a brushless motor, comprising a motor body and an eccentric shaft, a supporting seat is provided on the outer side of the eccentric shaft, the eccentric shaft comprises a shaft wheel and a shaft body, the supporting seat comprises an integrally formed barrel seat and a barrel shaft, the shaft wheel is rotatably installed on the inner side of the barrel seat through a third bearing, the rotating shaft can drive the shaft wheel to rotate, the rotating shaft, the barrel shaft, the barrel seat and the shaft wheel are coaxially distributed, a split eccentric shaft is used to replace the integrated eccentric shaft, a sliding block is provided at the end of the shaft body to connect with a shift fork of a movable pushing tooth, so as to ensure that the shaft body can only reciprocate along a set path on the shift fork, and the moving process is more lubricated and the friction is relatively low, a supporting seat is provided on the outer side of the eccentric shaft, and the radial force received by the eccentric shaft is transmitted to the supporting seat, so as to ensure that the rotating shaft and the rotor are always running on the set axis, thereby making the motor always in a better working state, that is, it can run in a state of low noise and low vibration.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless motors, and in particular to a brushless motor. Background Art

[0002] Electric hair clippers are commonly used tools in the hairdressing and hairdressing industries, and are generally composed of fixed teeth, movable teeth, adjustable handles, housings, and electrical components. With the advancement of technology and the increasing requirements for environmental protection and energy conservation, more and more electric hair clippers are beginning to use brushless motors as driving components to improve tool performance and user experience. The application trend of brushless motors in electric hair clippers is becoming increasingly significant, mainly due to the high efficiency, low noise and vibration, and precise control of brushless motors.

[0003] The brushless motor in the electric hair clipper mainly relies on the rotation of the eccentric shaft at the output end, and uses the crank rocker principle to drive the movable push teeth to perform periodic reciprocating motion compared to the fixed push teeth, so that the tooth parts of the fixed push teeth and the movable push teeth are staggered to cut the hair. In order to make the shaft end of the eccentric shaft cooperate with the fork of the movable push teeth, generally, the shaft length of the eccentric shaft is longer, and the eccentric shaft and the fork of the movable push teeth cooperate to apply radial force to the shaft, so that the rotor bears uneven load for a long time during rotation, causing the axial angle deviation of the rotor, and the deviation of the rotor will aggravate the wear of the rotor during rotation, and bring additional problems such as vibration and noise, thereby affecting the service life of the motor and the user experience of the electric hair clipper. Summary of the invention

[0004] The present invention provides a brushless motor, comprising a motor body and an eccentric shaft, wherein the motor body comprises a housing, a stator and a rotor coaxially distributed from outside to inside, an upper end cover and a lower end cover are respectively provided at two axial ends of the housing, a magnetic ring is fixedly provided at one end of the rotating shaft of the rotor close to the lower end cover, and a magnetoelectric sensor cooperating with the magnetic ring is provided on the inner side wall of the housing;

[0005] Among them, a supporting seat is provided on the outer side of the eccentric shaft, the eccentric shaft includes a shaft wheel and a shaft body, the supporting seat includes an integrally formed barrel seat and barrel shaft, the shaft wheel is rotatably installed on the inner side of the barrel seat through a third bearing, and a clamping groove for clamping the barrel shaft is opened on the upper end cover, the rotating shaft passes through the shaft hole in the clamping groove and is connected with the shaft wheel, and can drive the shaft wheel to rotate, the rotating shaft, barrel shaft, barrel seat and shaft wheel are coaxially distributed, the shaft body is parallel to the rotating shaft, and the shaft body is eccentrically placed on the shaft wheel.

[0006] Preferably, a fourth bearing is provided at the connection between the shaft body and the shaft wheel, and the shaft body is rotatably mounted on the shaft wheel through the fourth bearing. A slider is connected at the connection between the shaft body and the fork of the movable push tooth, and the slider is constructed to be able to slide on the inner side of the fork along a direction perpendicular to the movement of the movable push tooth, and remain relatively fixed with the fork in a direction parallel to the movement of the movable push tooth.

[0007] Preferably, the interior of the cylinder seat has a seat groove for accommodating the shaft wheel and the third bearing, the height of the seat groove is greater than the height of the shaft wheel, the interior of the cylinder shaft is provided with an axis groove having the same diameter as the axis hole, and the diameter of the axis groove is greater than the diameter of the rotating shaft;

[0008] Wherein, a plurality of magnetic blocks are disposed at the bottom of the shaft wheel and the top of the cylindrical shaft, and the plurality of magnetic blocks are centrally symmetrically distributed along the axial direction, and the polarities of any two adjacent magnetic blocks in the circumferential direction are opposite.

[0009] Preferably, the rotating shaft drives the shaft wheel to rotate, and drives the movable push tooth to reciprocate between the first end and the second end through the shaft body, with one rotation of the rotating shaft as a cycle. Within one cycle, the reciprocating movement path of the movable push tooth includes a first position, a second position, a third position and a fourth position. When the movable push tooth is located at the first end, it is located at the first position; when the movable push tooth is located at the second end, it is located at the third position; when the movable push tooth is located between the first end and the second end, it is located at the second position or the fourth position.

[0010] Preferably, the magnetic block includes a first magnetic block distributed on the shaft wheel and a second magnetic block distributed on the cylindrical shaft, and when the movable push tooth is located at the first position, the second position, the third position and the fourth position, the first magnetic block and the second magnetic block overlap in the axial direction, and when the movable push tooth is located at the first position and the third position, the first magnetic block and the second magnetic block repel each other, and when the movable push tooth is located at the second position and the fourth position, the first magnetic block and the second magnetic block attract each other.

[0011] Preferably, a first bearing is fixedly provided at the connection between the upper end cover and the rotating shaft, a second bearing is fixedly provided at the connection between the lower end cover and the rotating shaft, and a plurality of reinforcing ribs symmetrically distributed around the axial direction are provided on the inner side wall of the upper end cover.

[0012] Preferably, the shell includes an inner shell and an outer shell that are coaxially distributed, and the inner shell and the outer shell are both constructed as cylinders with open axial ends, the inner shell is fixed to the outer side of the stator, and the outer shell is arranged on the outer side of the inner shell, and a plurality of support bars that are centrally symmetrically distributed are fixed on the inner side wall of the outer shell, and a first airflow channel is provided between any two adjacent support bars, and the first airflow channel connects ports at both ends of the outer shell.

[0013] Preferably, air holes are provided on the outer wall of the inner shell corresponding to the front and rear sides of the stator, and the interior of the inner shell has an inner cavity, and the air holes on both sides are connected to each other through the inner cavity.

[0014] Preferably, along the circumferential direction of the inner shell, the number of the air holes is equal to the number of the support bars, the width of the air holes is equal to the width of the support bars, and the air holes and the support bars are staggered so that the first air flow channel overlaps with the air holes in the circumferential direction.

[0015] Preferably, a noise reduction ring is provided on the outer wall of the inner shell and the inner wall of the outer shell, the noise reduction ring includes a plurality of noise reduction blocks in the circumferential direction, the noise reduction blocks and the air holes are distributed overlapping in the axial direction, a second air flow channel is provided between any two adjacent noise reduction blocks, and the thickness of the noise reduction ring is smaller than the spacing between the inner shell and the outer shell.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The present invention adopts a split eccentric shaft instead of an integrated eccentric shaft, and arranges a slider at the end of the shaft body to connect with a shift fork of a movable push tooth, thereby ensuring that the shaft body can only reciprocate along a set path on the shift fork, and the movement process is more lubricated and the friction is relatively low. At the same time, a supporting seat is arranged on the outer side of the eccentric shaft to transmit the radial force exerted on the eccentric shaft to the supporting seat, thereby ensuring that the rotating shaft and the rotor are always running on the set axis, thereby keeping the motor in a better working state at all times, that is, it can run in a state of low noise and low vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a brushless motor shown in an embodiment of the present invention;

[0020] Figure 2It is a schematic diagram of the disassembled structure of a brushless motor shown in an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of a half-section structure of a brushless motor shown in an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the internal structure of a brushless motor shown in an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of a half-section structure of a motor main body part disassembled in an embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of a half-section structure of a support seat and an eccentric shaft partly separated as shown in an embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the integrated eccentric shaft and the tool holder in the prior art;

[0026] Figure 8 It is a schematic diagram of the structure of the eccentric shaft part and the tool holder in cooperation with each other in an embodiment of the present invention;

[0027] Figure 9a is a schematic structural diagram of an eccentric shaft driven tool holder in a first position as shown in an embodiment of the present invention;

[0028] Figure 9b is a schematic structural diagram of an eccentric shaft driven tool holder in a second position as shown in an embodiment of the present invention;

[0029] Fig.9c is a schematic structural diagram of an eccentric shaft driven tool holder in a third position as shown in an embodiment of the present invention;

[0030] Figure 9d is a schematic structural diagram of an eccentric shaft driven tool holder in a fourth position shown in an embodiment of the present invention;

[0031] 01, slider; 02, magnet; 100, movable push gear; 10, shell; 11, inner shell; 110, inner cavity; 111, air hole; 12, outer shell; 121, support bar; 1201, first air flow channel; 122, noise reduction ring; 1202, second air flow channel; 20, stator; 30, rotor; 31, rotating shaft; 311, knurled shaft; 40, upper end cover; 400, shaft hole; 401, mounting groove; 41, first bearing; 411, reinforcing ribs; 50, lower end cover; 51, second bearing; 60, magnetic ring; 70, magnetoelectric sensor; 80, supporting seat; 81, cylinder seat; 810, seat groove; 82, cylinder shaft; 820, shaft groove; 90, eccentric shaft; 91, shaft wheel; 911, third bearing; 92, shaft body; 921, fourth bearing; 90`, integrated eccentric shaft. DETAILED DESCRIPTION

[0032] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0033] like Figure 7 As shown, during operation, the current electric hair clipper mainly relies on the motor to drive the integrated eccentric shaft 90' to rotate to move the movable push teeth 100 to perform reciprocating motion, so as to cut the hair by interlacing the movable push teeth 100 and the fixed push teeth. When the movable push teeth 100 cut the hair, the movable push teeth 100 will generate a reaction force in the radial direction of the motor shaft on the integrated eccentric shaft 90', and the torque of the movable push teeth 100 will change periodically during the reciprocating process, so that the rotor 30 is subjected to uneven load for a long time during the rotation process, and finally causes the axial angle deviation of the rotor 30, which brings additional problems such as vibration and noise.

[0034] In order to solve the above problems, the present invention provides a brushless motor, which aims to reduce the impact of radial force on the rotor 30, so as to extend the service life of the motor as a whole and bring a low vibration and low noise user experience. The motor mainly includes a motor body and an eccentric shaft 90.

[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the motor body includes a shell 10, a stator 20 and a rotor 30 which are coaxially distributed from the outside to the inside. The two axial ends of the shell 10 are respectively provided with an upper end cover 40 and a lower end cover 50. A magnetic ring 60 is fixedly provided on the end of the rotating shaft 31 of the rotor 30 close to the lower end cover 50. A magnetoelectric sensor 70 cooperating with the magnetic ring 60 is provided on the inner wall of the shell 10. Generally, the magnetoelectric sensor 70 is arranged on a small PCB board, and the PCB board also has a control circuit connected to the magnetoelectric sensor 70. The brushless motor replaces the slip ring and the brush in the brush motor through the cooperation of the magnetic ring 60 and the magnetoelectric sensor 70. The multiple magnetic poles of the magnetic ring 60 are inductively sensed by the magnetoelectric sensor 70 (Hall sensor). The Hall sensor can detect the position of the rotor 30 and then send a signal to the electronic speed regulator. The electronic speed regulator controls the coil current of the stator 20 according to the signal, thereby driving the rotor 30 to rotate.

[0036] In order to enhance the axial strength of the eccentric shaft 90 and ensure that the eccentric shaft 90 will not be pushed away from the axis of the rotating shaft 31 of the rotor 30 by the reaction force of the movable push teeth 100 , a supporting seat 80 is provided on the outer side of the eccentric shaft 90 .

[0037] Among them, the eccentric shaft 90 includes a shaft wheel 91 and a shaft body 92, and the shaft wheel 91 and the shaft body 92 are both constructed as cylindrical structures. Generally, the height of the shaft body 92 is greater than the height of the shaft wheel 91, the diameter of the shaft body 92 is smaller than the diameter of the shaft wheel 91, and the shaft body 92 is eccentrically placed on the shaft wheel 91.

[0038] Furthermore, the supporting seat 80 includes an integrally formed cylinder seat 81 and a cylinder shaft 82 , and the shaft wheel 91 is rotatably mounted on the inner side of the cylinder seat 81 via a third bearing 911 .

[0039] In some embodiments, Figure 5 , Figure 6 and Figure 8 As shown, the interior of the cartridge seat 81 has a seat groove 810 for accommodating the shaft wheel 91 and the third bearing 911, the height of the seat groove 810 is greater than the height of the shaft wheel 91, and the interior of the barrel shaft 82 is provided with an axle groove 820, the diameter of the axle groove 820 is greater than the diameter of the rotating shaft 31. It can be seen that the shaft wheel 91 is installed in the seat groove 810 in the cartridge seat 81 through the third bearing 911, and a certain gap is reserved between the bottom of the shaft wheel 91 and the bottom of the seat groove 810, and a certain gap is reserved between the inner wall of the axle groove 820 and the outer wall of the rotating shaft 31, so that the shaft wheel 91 does not contact the cartridge seat 81 and the barrel shaft 82 during rotation, and the rotating shaft 31 does not contact the supporting seat 80 during rotation, and the shaft wheel 91 only rotates through the connection with the cartridge seat 81 through the third bearing 911, thereby reducing the friction resistance of the shaft wheel 91 rotation.

[0040] Furthermore, a knurled shaft portion 311 is provided at the axial end of the rotating shaft 31, and a corresponding knurled groove is opened at the axial center position of the corresponding shaft wheel 91. When the supporting seat 80 is installed in place, the knurled shaft portion 311 is inserted into the knurled groove along the axial direction, which can drive the shaft wheel 91 to rotate.

[0041] At the same time, under the action of the supporting seat 80, when the shaft wheel 91 is subjected to the radial thrust of the movable pushing tooth 100 on the shaft body 92, the supporting seat 80 can bear the radial thrust to ensure that the shaft wheel 91 is always in the supporting seat 80 and rotates along the axis of the rotating shaft 31, thereby avoiding the occurrence of axial deviation of the shaft wheel 91.

[0042] Furthermore, on the basis of ensuring that the axis of the shaft wheel 91 will not deviate, in order to prevent the shaft body 92 from being deviated or bent due to radial force, a fourth bearing 921 is provided at the connection between the shaft body 92 and the shaft wheel 91, and the shaft body 92 is rotatably mounted on the shaft wheel 91 through the fourth bearing 921. In this way, the connection method between the shaft body 92 and the shaft wheel 91 is adjusted from the existing fixed connection to a rotating connection.

[0043] Since the shaft end portion of the current integrated eccentric shaft 90' is directly inserted into the fork of the movable push tooth 100, when the integrated eccentric shaft 90' is driven to rotate by the rotating shaft 31 of the motor, its shaft end portion rotates in the fork. Since the fork is a linear reciprocating motion, and the shaft end portion is a circular motion, there are multi-directional radial forces between the shaft end portion and the fork. After long-term use, the shaft end of the integrated eccentric shaft 90' and the fork of the movable push tooth 100 are aggravated by wear, and there is an active gap. The existence of the gap will cause the movable push tooth 100 to shake or jump during movement, making the operation of the electric clipper unstable, affecting the hair cutting effect and accuracy, and will further aggravate wear and noise.

[0044] Therefore, a slider 01 is connected at the connection between the shaft body 92 and the fork of the movable push tooth 100. For the purpose of reducing sliding friction, the slider 01 can be a rectangular block made of ceramic or stainless steel. The slider 01 is fixedly mounted on the end of the shaft body 92, and the slider 01 can slide on the inside of the fork in a direction perpendicular to the movement of the movable push tooth 100, and remain relatively fixed with the fork in a direction parallel to the movement of the movable push tooth 100.

[0045] Compared with the situation where the shaft end of the integrated eccentric shaft 90' and the fork of the movable push tooth 100 are subject to increased wear, a slider 01 is set at the end of the shaft body 92 to connect with the fork of the movable push tooth 100, ensuring that the shaft body 92 only reciprocates along the set path in the fork, and the movement process is more lubricated and the friction is relatively low. Therefore, the force exerted on the shaft body 92 is more certain. Under the joint action of the slider 01, the fourth bearing 921 and the third bearing 911, the friction in the entire transmission system is smaller, and the radial force exerted on the eccentric shaft 90 can also be transmitted to the support seat 80, ensuring that the rotating shaft 31 and the rotor 30 are always running on the set axis, so that the motor is always in a better working state, that is, it can run under low noise and low vibration conditions.

[0046] In this way, when the rotating shaft 31 drives the movable push tooth 100 to move through the eccentric shaft 90, the movement process of the movable push tooth 100 can be made more stable, and the eccentric shaft 90 can be ensured to have a longer service life and stability in use.

[0047] In some embodiments, since the shaft body 92 is generally constructed as a relatively slender structure, its own structural strength is relatively weak. In order to avoid bending of the shaft body 92, the shaft body 92 as a whole can be constructed as a conical structure, and a cylindrical plug-in shaft portion is retained at the connection end with the slider 01 and the fourth bearing 921. The bottom of the cone is close to one side of the shaft wheel 91, and a certain gap is left to ensure that during the rotation of the shaft body 92, there will be no friction with the shaft wheel 91. In this way, it is strengthened from the structural direction to ensure that the entire eccentric shaft 90 will not deviate from the set axis movement during operation.

[0048] In this way, the radial force generated by the movable push gear 100 during its movement is borne by the supporting seat 80 to ensure the stable position of the supporting seat 80 .

[0049] Furthermore, a mounting groove 401 for mounting the cylindrical shaft 82 is opened on the upper end cover 40, and the rotating shaft 31 passes through the shaft hole 400 in the mounting groove 401 to be connected with the shaft wheel 91 and can drive the shaft wheel 91 to rotate. The diameter of the shaft groove 820 is the same as the diameter of the shaft hole 400.

[0050] Among them, the rotating shaft 31, the barrel shaft 82, the barrel seat 81 and the shaft wheel 91 are coaxially distributed, the shaft body 92 is parallel to the rotating shaft 31, and the thickness of the barrel shaft 82 is thicker than the wall thickness of the barrel seat 81. The barrel shaft 82 is directly installed on the upper end cover 40 to transfer the force to the upper end cover 40, so that the upper end cover 40 shares the radial force, ensuring that the rotating shaft 31, the barrel shaft 82, the barrel seat 81 and the shaft wheel 91 are always in a coaxial state.

[0051] In some embodiments, Figure 4 As shown, along the axial direction, there is a certain gap between the barrel seat 81 and the upper end cover 40, which is used to install the motor into the corresponding slot of the electric hair clipper. The gap is the limit plate structure of the electric hair clipper, which is used to separate the motor compartment and the transmission compartment.

[0052] Since the eccentric shaft 90 drives the movable push tooth 100 to do reciprocating motion, the principle is the reciprocating motion driven by the crank connecting rod, and there is a dead point position in this motion. In mechanical principle, when the transmission angle on the driven member is equal to zero, the effective rotation torque of the driving force on the driven member is zero, and this position is called the dead point position of the mechanism. In the electric hair clipper, when the connecting rod (such as the shaft 92) in the transmission mechanism of the electric hair clipper and the driven member (such as the movable push tooth 100) are collinear, a dead point position may be formed. At this time, since the transmission angle is zero, the effective rotation torque of the driving force on the driven member (the movable push tooth 100) is also zero, so the movable push tooth 100 cannot continue to perform effective shearing action.

[0053] In the scheme shown in this embodiment, Figure 8 , Figure 9a , Figure 9b , Fig.9c and Figure 9d As shown, the movable push teeth 100 are located at both ends of its movable path ( Figure 9a and Fig.9c When the movable push tooth 100 is in the position near these two positions, due to the relatively small transmission angle, the torque at startup is still relatively large. Since the electric hair clipper will start and stop frequently during work, if the motor is started frequently with a large torque for a long time, the wear of the motor will be aggravated, thereby affecting the stability of the motor operation.

[0054] Therefore, in order to reduce the torque at motor startup, multiple magnetic blocks 02 are provided at the bottom of the shaft wheel 91 and the top of the cylindrical shaft 82. The multiple magnetic blocks 02 are centrally symmetrically distributed along the axial direction, and the polarities of any two adjacent magnetic blocks 02 in the circumferential direction are opposite.

[0055] like Figure 8 , Figure 9a , Figure 9b , Fig.9c and Figure 9d As shown, it should be understood that the rotating shaft 31 drives the shaft wheel 91 to rotate, and drives the movable push gear 100 at the first end ( Figure 9a The right end of the movable push tooth 100) and the second end ( Fig.9c The movable push tooth 100 reciprocates between the first position (the left end of the movable push tooth 100), with one rotation of the rotating shaft 31 as one cycle. In one cycle, the reciprocating path of the movable push tooth 100 includes the first position ( Figure 9a The movable push gear 100 shown in the second position ( Figure 9b The position shown in the middle movable push gear 100), the third position ( Fig.9c The movable push gear 100 is shown in the position) and the fourth position ( Figure 9d The movable push tooth 100 is in the position shown in the middle), wherein, taking the circle where the surface of the shaft wheel 91 is located as an example, the lines connecting the four points of the first position, the second position, the third position and the fourth position in sequence are a square, and when the movable push tooth 100 is located at the first end, it is in the first position, when the movable push tooth 100 is located at the second end, it is in the third position, and when the movable push tooth 100 is located between the first end and the second end, it is in the second position or the fourth position.

[0056] Among them, the magnetic block 02 includes a first magnetic block distributed on the shaft wheel 91 and a second magnetic block distributed on the cylindrical shaft 82. When the movable push tooth 100 is located at the first position, the second position, the third position and the fourth position, the first magnetic block and the second magnetic block overlap in the axial direction.

[0057] When the movable push tooth 100 is located at the first position and the third position, the first magnetic block and the second magnetic block repel each other, and when the movable push tooth 100 is located at the second position and the fourth position, the first magnetic block and the second magnetic block attract each other. In this way, when the motor stops working, under the mutual attraction of the first magnetic block and the second magnetic block, the movable push tooth 100 will stay in the second position or the fourth position. At this position, the starting torque of the motor is the smallest, so it is easy to start smoothly.

[0058] like Figure 5As shown, a first bearing 41 is fixedly provided at the connection between the upper end cover 40 and the rotating shaft 31, and a second bearing 51 is fixedly provided at the connection between the lower end cover 50 and the rotating shaft 31, which can improve the stability of the rotor 30 during rotation, and a plurality of reinforcing ribs 411 are provided on the inner side wall of the upper end cover 40, which are centrally symmetrically distributed around the axial direction, so as to enhance the strength of the upper end cover 40 and ensure that the upper end cover 40 can provide stable support for the supporting seat 80.

[0059] like Figure 2 , Figure 3 and Figure 4 As shown, the housing 10 includes an inner housing 11 and an outer housing 12 which are coaxially distributed. Both the inner housing 11 and the outer housing 12 are constructed as cylinders which are open at both axial ends. The inner housing 11 is fixed to the outside of the stator 20, and the outer housing 12 is arranged on the outside of the inner housing 11.

[0060] Among them, a plurality of support bars 121 distributed in a central symmetrical manner are fixedly provided on the inner side wall of the outer shell 12, and a first air flow channel 1201 is provided between any two adjacent support bars 121, and the first air flow channel 1201 is connected to the ports at both ends of the outer shell 12. In this way, the composite structure of the inner shell 11 and the outer shell 12 can increase the contact area between the motor shell and the air, and facilitate the airflow to flow between the inner shell 11 and the outer shell 12. When the airflow passes through the first air flow channel 1201, it can contact the inner shell 11 and the outer shell 12 and perform heat exchange, thereby achieving the purpose of cooling the shell 10.

[0061] Furthermore, air holes 111 are provided on the outer wall of the inner shell 11 corresponding to the front and rear sides of the stator 20 . The inner shell 11 has an inner cavity 110 , and the air holes 111 on both sides are connected to each other through the inner cavity 110 .

[0062] like Figure 2 and Figure 5 As shown, in some embodiments, along the circumferential direction of the inner shell 11, the number of air holes 111 is equal to the number of support bars 121, the width of the air holes 111 is equal to the width of the support bars 121, and the air holes 111 and the support bars 121 are staggered, so that the first air flow channel 1201 overlaps with the air holes 111 in the circumferential direction. In this way, when the external air flows through the first air flow channel 1201, it will partially enter the inner cavity 110 to participate in heat exchange, and squeeze the hot air in the inner cavity 110 out of the air holes 111, so as to discharge the hot air in the inner cavity 110 to the outside, and accelerate the heat exchange of the inside and outside of the motor. At the same time, the support bars 121 not only have the functions of heat conduction and airflow guidance, but also can strengthen the structure of the shell 10.

[0063] Furthermore, Figure 2As shown, a noise reduction ring 122 is provided on the outer wall of the inner shell 11 and the inner wall of the outer shell 12. The noise reduction ring 122 is made of a porous foaming material, such as foam. The noise reduction ring 122 includes a plurality of arc-shaped noise reduction blocks in the circumferential direction. The noise reduction blocks and the air holes 111 are overlapped in the axial direction. The curvature of the noise reduction blocks is the same as that of the air holes 111, and is larger than the curvature of the air holes 111 so as to cover the entire air holes 111 in the circumferential direction. A second air flow channel 1202 is provided between any two adjacent noise reduction blocks. The thickness of the noise reduction ring 122 is less than the spacing between the inner shell 11 and the outer shell 12.

[0064] In some embodiments, the number of noise reduction rings 122 is set to two to three, which are respectively distributed on the outer wall of the inner shell 11 and the inner wall of the outer shell 12. The noise reduction rings 122 form a serpentine channel for air flow in the axial direction. When the sound waves pass through the serpentine channel, they will contact the noise reduction rings 122 multiple times and reduce the energy transmitted by the sound waves, thereby reducing the noise when the motor is working.

[0065] In combination with the above embodiments, a split eccentric shaft 90 is used to replace the existing integrated eccentric shaft 90', the shaft body 92 is rotatably connected to the shaft wheel 91, and a slider 01 is set at the end of the shaft body 92 to connect with the fork of the movable push tooth 100, to ensure that the shaft body 92 only reciprocates along the set path in the fork, and the movement process is more lubricated and the friction is relatively low. At the same time, a supporting seat 80 is set on the outer side of the eccentric shaft 90 to transfer the radial force exerted on the eccentric shaft 90 to the supporting seat 80, to ensure that the rotating shaft 31 and the rotor 30 are always running on the set axis, so that the motor is always in a better working state, that is, it can run in a low noise and low vibration state.

[0066] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A brushless motor, characterized in that: The motor body comprises a motor body and an eccentric shaft (90), wherein the motor body comprises a housing (10), a stator (20) and a rotor (30) which are coaxially arranged from outside to inside, an upper end cover (40) and a lower end cover (50) are respectively provided at two axial ends of the housing (10), a magnetic ring (60) is fixedly provided on the rotating shaft (31) of the rotor (30), and a magnetoelectric sensor (70) which cooperates with the magnetic ring (60) is provided on the inner side wall of the housing (10); A support seat (80) is provided on the outer side of the eccentric shaft (90), the eccentric shaft (90) comprises a shaft wheel (91) and a shaft body (92), the support seat (80) comprises an integrally formed barrel seat (81) and a barrel shaft (82), the shaft wheel (91) is rotatably mounted on the inner side of the barrel seat (81) via a third bearing (911), a clamping groove (401) for clamping the barrel shaft (82) is provided on the upper end cover (40), the rotating shaft (31) passes through an axial hole (400) in the clamping groove (401) and is connected to the shaft wheel (91), and can drive the shaft wheel (91) to rotate, the rotating shaft (31), the barrel shaft (82), the barrel seat (81) and the shaft wheel (91) are coaxially distributed, the shaft body (92) is parallel to the rotating shaft (31), and the shaft body (92) is eccentrically disposed on the shaft wheel (91); A fourth bearing (921) is provided at the connection between the shaft body (92) and the shaft wheel (91); the shaft body (92) is rotatably mounted on the shaft wheel (91) via the fourth bearing (921); a slider (01) is connected at the connection between the shaft body (92) and the shift fork of the movable push tooth (100); the slider (01) is configured to be able to slide inside the shift fork in a direction perpendicular to the movement of the movable push tooth (100) and remain relatively fixed with the shift fork in a direction parallel to the movement of the movable push tooth (100).

2. A brushless motor according to claim 1, characterized in that: The interior of the cylinder seat (81) is provided with a seat groove (810) for accommodating the shaft wheel (91) and the third bearing (911); the height of the seat groove (810) is greater than the height of the shaft wheel (91); the interior of the cylinder shaft (82) is provided with an axis groove (820) having the same diameter as the axis hole (400); the diameter of the axis groove (820) is greater than the diameter of the rotating shaft (31); A plurality of magnetic blocks (02) are provided at the bottom of the shaft wheel (91) and the top of the cylindrical shaft (82); the plurality of magnetic blocks (02) are centrally symmetrically distributed along the axial direction, and the polarities of any two adjacent magnetic blocks (02) in the circumferential direction are opposite.

3. A brushless motor according to claim 2, characterized in that: The rotating shaft (31) drives the shaft wheel (91) to rotate, and drives the movable push tooth (100) to reciprocate between the first end and the second end through the shaft body (92), with one rotation of the rotating shaft (31) as one cycle. Within one cycle, the reciprocating path of the movable push tooth (100) includes a first position, a second position, a third position and a fourth position. When the movable push tooth (100) is located at the first end, it is located at the first position; when the movable push tooth (100) is located at the second end, it is located at the third position; when the movable push tooth (100) is located between the first end and the second end, it is located at the second position or the fourth position.

4. A brushless motor according to claim 3, characterized in that: The magnetic block (02) comprises a first magnetic block distributed on the shaft wheel (91) and a second magnetic block distributed on the cylindrical shaft (82); when the movable push tooth (100) is located at the first position, the second position, the third position and the fourth position, the first magnetic block and the second magnetic block are overlapped in the axial direction; and when the movable push tooth (100) is located at the first position and the third position, the first magnetic block and the second magnetic block repel each other; and when the movable push tooth (100) is located at the second position and the fourth position, the first magnetic block and the second magnetic block attract each other.

5. The brushless motor according to claim 1, characterized in that: A first bearing (41) is fixedly provided at a connection between the upper end cover (40) and the rotating shaft (31), a second bearing (51) is fixedly provided at a connection between the lower end cover (50) and the rotating shaft (31), and a plurality of reinforcing ribs (411) are provided on an inner side wall of the upper end cover (40) and are centrally symmetrically distributed in an axial direction.

6. A brushless motor according to claim 1, characterized in that: The shell (10) comprises an inner shell (11) and an outer shell (12) which are coaxially arranged, the inner shell (11) and the outer shell (12) being both constructed as cylindrical bodies with two axial ends open, the inner shell (11) being fixed to the outside of the stator (20), the outer shell (12) being arranged on the outside of the inner shell (11), a plurality of support bars (121) being centrally symmetrically arranged being fixedly arranged on the inner side wall of the outer shell (12), a first airflow channel (1201) being provided between any two adjacent support bars (121), the first airflow channel (1201) being connected to ports at both ends of the outer shell (12).

7. A brushless motor according to claim 6, characterized in that: Air holes (111) are provided on the outer wall of the inner shell (11) at the front and rear sides corresponding to the stator (20), and the inner shell (11) has an inner cavity (110) inside, and the air holes (111) on both sides are connected to each other through the inner cavity (110).

8. A brushless motor according to claim 7, characterized in that: Along the circumferential direction of the inner shell (11), the number of the air holes (111) is equal to the number of the support bars (121), the width of the air holes (111) is equal to the width of the support bars (121), and the air holes (111) and the support bars (121) are staggered in distribution, so that the first air flow channel (1201) overlaps with the air holes (111) in the circumferential direction.

9. A brushless motor according to claim 8, characterized in that: A noise reduction ring (122) is provided on the outer wall of the inner shell (11) and the inner wall of the outer shell (12); the noise reduction ring (122) comprises a plurality of noise reduction blocks in the circumferential direction; the noise reduction blocks and the air holes (111) are distributed overlappingly in the axial direction; a second air flow channel (1202) is provided between any two adjacent noise reduction blocks; and the thickness of the noise reduction ring (122) is smaller than the distance between the inner shell (11) and the outer shell (12).

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