CN106899139B

CN106899139B - Gearbox and driving mechanism using same

Info

Publication number: CN106899139B
Application number: CN201510955307.1A
Authority: CN
Inventors: 黄文发; 李延军; 孙志军
Original assignee: Johnson Electric SA
Current assignee: Johnson Electric SA
Priority date: 2015-12-17
Filing date: 2015-12-17
Publication date: 2020-04-03
Anticipated expiration: 2035-12-17
Also published as: CN106899139A

Abstract

The invention relates to a gearbox, which comprises a gearbox shell, a speed changer and an output shaft, wherein the speed changer is accommodated in the gearbox shell, and the output shaft is connected with the speed changer. The invention also designs a driving mechanism comprising the gearbox. The driving mechanism has better performance.

Description

Gearbox and driving mechanism using same

Technical Field

The invention relates to a gearbox and a driving mechanism using the gearbox.

Background

The driving mechanism is generally applied to electronic devices, communication devices (such as antennas) or other devices (such as automobiles), and drives a target object to move angularly and in a displacement manner. However, in the trend of miniaturization of various electronic devices, the space for accommodating the driving mechanism in the device is required to be continuously reduced, that is, the size of the driving mechanism is required to be miniaturized, and after the size of the existing driving mechanism is reduced, the corresponding efficiency of the existing driving mechanism is also obviously reduced, so that the requirements of the electronic devices cannot be met.

Disclosure of Invention

In view of the above, it is desirable to provide a driving mechanism and a transmission case of the driving mechanism with better performance.

A gearbox comprises a gearbox shell, a transmission and an output shaft, wherein the transmission is contained in the gearbox shell, the output shaft is connected with the transmission, and the number of the transmission stages is two, three or four.

In a preferred embodiment, the transmission is a three-speed transmission.

Preferably, an inner gear ring is formed on the inner peripheral wall of the transmission housing, and the three-stage transmission is of a three-stage planetary transmission structure and is meshed with the inner gear ring.

As a preferable scheme, the three-stage transmission comprises three sun gears, three groups of planet gears and three planet carriers, wherein the three groups of planet gears are respectively meshed with the corresponding sun gears and the corresponding inner gear rings, and each group of planet gears is respectively connected with the corresponding planet carrier.

As a preferable scheme, the three sun gears are a first sun gear, a second sun gear and a third sun gear, the three planetary carriers are a first planetary carrier, a second planetary carrier and a third planetary carrier, the second sun gear and the first planetary carrier are designed integrally, and the third sun gear and the second planetary carrier are designed integrally.

Preferably, a gasket is arranged between the second set of planet wheels and the first planet carrier and/or between the third set of planet wheels and the second planet carrier.

Preferably, at least one of the three sun gears, or at least one of the three planetary gears is made of powder metallurgy.

Preferably, the transmission further comprises an end cover, and the end cover is accommodated in the transmission housing and fixed with the transmission housing.

As a preferable scheme, the gearbox further comprises a rolling bearing, and the rolling bearing is sleeved on the output shaft and is positioned between the gearbox shell and the output shaft.

Preferably, the gearbox housing is of one-piece design.

A driving mechanism comprises the gearbox and a motor connected with the gearbox.

As a preferred aspect, the motor includes a rotating assembly that rotates around a central axis thereof, a stationary assembly that supports the rotating assembly, a motor housing that houses at least a part of the rotating assembly, and a cover that is connected to the motor housing, and the rotating assembly includes:

a rotating shaft extending along the central axis and connected with a transmission of the gearbox;

a holder that rotates together with the rotating shaft; and

a rotor magnet held by the holder;

the stationary assembly includes:

a stator core;

a plurality of coils wound around the stator core;

a circuit board electrically connected to the coil; and

a support member supporting the stator core and the circuit board.

As a preferred scheme, the circuit board includes a first circuit board, a second circuit board, and a connecting portion connecting the first circuit board and the second circuit board, the supporting member supports the first circuit board and the second circuit board, one end of the connecting portion is connected to the first circuit board, the other end of the connecting portion is connected to the second circuit board, the first circuit board is a circuit board on which a motor driving circuit is mounted, the second circuit board is a circuit board on which a hall element is mounted, and the connecting portion is used to transmit electric power and/or signals between the motor driving circuit and the hall element.

As a preferable scheme, the circuit board is a flexible circuit board, or the first circuit board and the second circuit board are flexible circuit boards, or the connecting portion is made of a flexible material.

As a preferable mode, the support member includes a circuit board support portion including first and second opposite end walls and a peripheral wall connecting the first and second end walls, the first and second circuit boards being respectively provided on both sides of the first and second end walls.

Preferably, a notch is formed in a peripheral wall of the circuit board supporting portion, the connecting portion penetrates through the notch, a first buckling portion is formed on a peripheral edge of the cover body in a protruding manner in a direction parallel to the central axis, and the first buckling portion is buckled in the notch, so that the connecting portion is located between the circuit board supporting portion and the first buckling portion.

As a preferable scheme, at least one second buckling part is further convexly extended along a direction parallel to the central axis on the periphery of the cover body, at least one buckling groove is formed on the peripheral wall of the circuit board supporting part in a radially recessed manner, and the at least one second buckling part is clamped in the at least one buckling groove.

As a preferable scheme, a supporting surface is formed on the circumferential wall of the circuit board supporting part, a step surface coplanar with the supporting surface is formed on the outer wall of the first buckling part, the end surface of the at least one second buckling part is coplanar with the supporting surface, and the motor shell is sleeved on the circuit board supporting part and abutted against the supporting surface, the step surface and the end surface of the at least one second buckling part.

As a preferable scheme, the motor further includes two rolling bearings, one of the two rolling bearings of the motor is disposed between the rotating shaft and the motor housing, the other is disposed between the rotating shaft and the support, and the two rolling bearings of the motor are respectively located at two ends of the rotating shaft.

A driving mechanism comprises a motor and a gearbox connected with the motor, wherein the length of the driving mechanism is not less than 45mm, and the length of the gearbox is 20.5-28.5 mm.

Preferably, the length of the driving mechanism is one of 48mm, 49mm, 49.5mm, 50mm, 50.5mm, 51mm, 51.5mm, 51.8mm, 52mm, 52.3mm, 52.8mm, 53mm and 54mm, and the length of the gearbox is one of 20.5mm, 21mm, 22.5mm, 23mm, 23.5mm, 24.5mm, 25mm, 25.5mm, 26mm, 26.5mm, 27mm, 28mm and 28.5 mm.

Preferably, the total length of the gearbox and the motor is less than or equal to 52 mm.

Preferably, the gearbox has an efficiency of 65% to 85%.

Preferably, the gearbox efficiency is one of 69%, 70%, 71%, 71.5%, 71.9%, 72%, 72.2%, 72.5%, 73%, 75%, 80%.

Preferably, the total efficiency of the drive mechanism is greater than or equal to 40%.

Preferably, the motor has an efficiency of 55% to 65%.

Preferably, the motor has an efficiency of one of 55%, 57%, 60%, 62%, 65%.

Preferably, the transmission ratio of the driving mechanism is 180-250.

Preferably, the torque of the motor is 2.77mNm to 3.85mNm, and the output torque of the gearbox is 0.3 Nm to 1.0 Nm.

Preferably, the outer diameter of the driving mechanism is less than or equal to 16 mm.

Preferably, the transmission case includes a transmission case, a transmission, and an output shaft, the transmission is accommodated in the transmission case, the output shaft is connected to the transmission, the length of the transmission case is the length of the transmission case, and the length of the transmission case is 20.5mm to 28.5 mm.

Preferably, the transmission housing has a length of one of 24.5mm, 25mm, 25.5mm, 26mm, 26.5mm, 27mm, 28mm, 28.5 mm.

Preferably, the motor and the gearbox are coated with a plastic film.

As a preferable mode, the plastic film is a PET film.

A driving mechanism comprises a motor and a gearbox connected with the motor, the transmission ratio of the driving mechanism is 180-250, and the efficiency of the gearbox is 65-85%.

Preferably, the length of the gearbox is 20.5 mm-28.5 mm.

Preferably, the transmission includes a transmission housing, a transmission housed in the transmission housing, and an output shaft connected to the transmission, the motor is connected to the transmission, and the transmission is a three-stage transmission.

The gearbox of the driving mechanism is provided with a two-stage to four-stage speed changer or the length of the gearbox is limited, so that higher power and efficiency can be achieved.

Drawings

Fig. 1 is a perspective view of a drive mechanism according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view of the drive mechanism shown in fig. 1.

Fig. 3 is a schematic perspective exploded view of the drive mechanism shown in fig. 2 at another angle.

Fig. 4 is a perspective view of a part of the mechanism of the drive mechanism shown in fig. 1.

Fig. 5 is a schematic cross-sectional view of the drive mechanism of fig. 1 taken along V-V.

Fig. 6 is a perspective view of a motor portion of the driving mechanism shown in fig. 1.

Fig. 7 is a perspective view of another perspective view of the motor portion shown in fig. 6.

Fig. 8 is an exploded perspective view of the motor shown in fig. 6.

Fig. 9 is an exploded perspective view of the motor shown in fig. 8 from another perspective.

Fig. 10 is a perspective view showing the construction of a transmission part of the drive mechanism shown in fig. 1.

Fig. 11 is a perspective view of another perspective of the partial structure of the transmission shown in fig. 10.

Description of the main elements

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a driving mechanism 1 according to an embodiment of the present invention is used for driving an external device (not shown) to rotate or driving an external device to rotate through a transmission mechanism (not shown). Specifically, the external device may be an electrically operated device (e.g., a communication device, an electronic device) or a non-electrically operated device (e.g., a window of a vehicle). In the present embodiment, the driving mechanism 1 is used in a communication apparatus (not shown), and is used to control rotation of an antenna angle or movement of an antenna position in the communication apparatus.

The drive mechanism 1 includes a motor 100 and a transmission case 200 coaxially connected to the motor 100. I.e. the central axis of the drive mechanism 1, the central axis of the motor 100 and the central axis of the gearbox 200 coincide. The motor 100 in the present embodiment is an outer rotor type motor. It will be appreciated that in other embodiments, the motor 100 may be other types of motors, such as an inner rotor type motor, which has little effect on the efficiency of the drive mechanism. The following describes the structures of the motor 100 and the transmission 200 in the present embodiment.

Referring to fig. 2 to 5, the motor 100 includes a rotating element 10 rotating around a central axis thereof, a stationary element 30 supporting the rotating element 10 to be rotatable, a motor housing 50 accommodating at least a portion of the rotating element 10 and/or at least a portion of the stationary element 30, and a cover 70 accommodating the remaining portion of the stationary element 30. The center axes of the rotating unit 10, the stationary unit 30, the motor housing 50, and the cover 70 coincide. The cover 70 is located at one end of the motor housing 50 and is connected to the motor housing 50.

The rotating unit 10 includes a rotating shaft 11 extending along a central axis of the motor, a holder 13 rotating together with the rotating shaft 11, a receiver 15 supporting the holder 13, and a rotor magnet 17 held by the holder 13.

The rotary shaft 11 has a substantially rod shape, and one end thereof penetrates the motor housing 50 to protrude outside the motor housing 50 to facilitate connection with the transmission case 200. The holder 13 is substantially cylindrical, is disposed around the rotating shaft 11, and has a gap from the rotating shaft 11. The socket 15 is fixedly provided on the rotating shaft 11 and fixed to one end of the holder 13, so that the holder 13 can rotate together with the rotating shaft 11 through the socket 15. In another embodiment, the receiving member 15 may be omitted, and the holder 13 may be directly connected to the rotating shaft 11. In the present embodiment, the socket 15 and the holder 13 are fixed by caulking. In other embodiments, the receiving member 15 and the retainer 13 may be fixed together by other means, such as welding.

Referring to fig. 6 and 7, the receiving member 15 includes a cylindrical body 151, and a first flange 153 and a second flange 155 (see fig. 7) formed by radially protruding the outer periphery of the body 151, wherein the first flange 153 and the second flange 155 are connected in a step shape, and the protruding radius of the second flange 155 is greater than that of the first flange 153. Annular grooves 157 (as shown in fig. 5) are formed on the end surfaces of the first flange 153 and the second flange 155. The body 151 is fitted over the shaft 11, one end of the holder 13 is fitted over the outer peripheral wall of the first flange 153, and the inner wall of the holder 13 is supported on the end surface of the second flange 155 adjacent to the first flange 153 (i.e., the end surface of the second flange 155 where the annular groove 157 is formed).

The rotor magnet 17 is disposed in the holder 13 and supported by the holder 13, and the rotor magnet 17 is disposed adjacent to the holder 13 and around the rotating shaft 11. The center axis of the rotor magnet 17 coincides with the center axis of the rotating shaft 11.

The stationary assembly 30 includes a support 31, a stator core 33, a plurality of coils 35, two rolling bearings 37, and a circuit board 39 electrically connected to the coils 35. The support 31 serves to support the stator core 33 and the circuit board 39. The coils 35 are wound around the stator cores 33, respectively. Both of the rolling bearings 37 are fitted over the rotary shaft 11, one of which is disposed between the rotary shaft 11 and the motor housing 50, and the other of which is disposed between the rotary shaft 11 and the support 31, to support the rotary shaft 11 to be rotatable. By supplying power to the coil 35, a magnetic field is generated in the stator core 33. This generates a rotational moment between stator core 33 and rotor magnet 17.

Referring to fig. 8 and 9, the supporting member 31 includes a circuit board supporting portion 311, a stator supporting portion 313, and a connecting portion 315 connecting the circuit board supporting portion 311 and the stator supporting portion 313. The support 31 is provided with a through hole 317 (see fig. 9) along its central axis. The through hole 317 penetrates the circuit board support portion 311, the connection portion 315, and the stator support portion 313, and is used for the shaft 11 to pass through. The through hole 317 has a larger aperture through the circuit board support portion 311 and the connection portion 315 than through the stator support portion 313.

The board support portion 311 is substantially cylindrical and includes first and

second end walls

3111 and 3112 opposite to each other, and a peripheral wall 3113 connecting the first and

second end walls

3111 and 3112. The second end wall 3112 is closer to the stator support portion 313 and the connection portion 315 than the first end wall 3111. The through hole 317 penetrates the first end wall 3111. The first and

second circuit boards

391 and 392 are disposed on both sides of the first and

second end walls

3111 and 3112, respectively.

The first end wall 3111 is recessed to form a housing groove 3114, and three grooves 3115 are recessed in the axial direction on the bottom surface of the housing groove 3114. The notch 3115 is fan-shaped and surrounds the through hole 317. The ends of the three grooves 3115 are evenly spaced. Three positioning posts 3117 protrude from the second end wall 3112. The peripheral wall 3113 is substantially stepped, and a contact surface 3110 is formed at the step. Three engaging grooves 3118 are formed in the circumferential wall 3113 in a radially recessed manner. Three engaging grooves 3118 are evenly spaced. The peripheral wall 3113 is also formed with a notch 3119. The notch portion 3119 is located between two of the engagement grooves 3118. The notch portion 3119 is substantially in the shape of a portion of the circuit board support portion 311 cut out on a plane parallel to the central axis.

In other embodiments, the number of any one of the positioning posts 3117, the groove 3115 and the engaging groove 3118 may be one, two, four or more than four, and when the number is more than one, the positioning posts may be arranged irregularly. In this embodiment, the circuit board supporting portion 311 is made of an insulating material, and in other embodiments, the circuit board supporting portion 311 may be made of a conductive material, and an insulating layer is covered on the circuit board supporting portion 311.

The connection portion 315 is connected to the second end wall 3112 of the circuit board support portion 311. The outer circumferential edge of the connecting portion 315 is stepped. The stator support portion 313 is connected to the connection portion 315. The stator support portion 313 has a rod shape and a diameter smaller than that of the connection portion 315. In the present embodiment, the circuit board supporting portion 311, the connecting portion 315, and the stator supporting portion 313 are integrally designed, and in other embodiments, the circuit board supporting portion 311, the connecting portion 315, and the stator supporting portion 313 may be assembled into the support 31 as separate elements.

Referring to fig. 2, 3 and 5 again, the stator core 33 is disposed on the stator supporting portion 313 and surrounded by the rotor magnet 17. The end of stator core 33 close to connecting portion 315 abuts against the end face of connecting portion 315. In the present embodiment, the number of coils 35 is six, but the number is not limited to this, and the coils are wound around the stator core 33. The stepped outer peripheral edge of the connecting portion 315 forms an escape space for the coil 35.

One of the two rolling bearings 37 is housed in the through hole 317 and is provided between the rotating shaft 11 and the connecting portion 315, and the other of the two rolling bearings 37 is provided between the rotating shaft 11 and the motor housing 50. The two rolling bearings 37 are adjacent to both end portions of the rotating shaft 11, respectively.

Referring to fig. 5 to 9, the circuit board 39 includes a first circuit board 391, a second circuit board 392, and a connecting portion 393 connecting the first circuit board 391 and the second circuit board 392. The connecting portion 393 has one end connected to the first circuit board 391 and the other end connected to the second circuit board 392, and in this embodiment, the connecting portion 393 is made of a flexible material, so that the first circuit board 391 and the second circuit board 392 can be folded along the connecting portion 393. In another embodiment, the circuit board 39 is made of a flexible material, so the first circuit board 391 and the second circuit board 392 can be folded, for example, the circuit board 39 can be a flexible circuit board. In still another embodiment, the first circuit board 391 and the second circuit board 392 in the circuit boards 39 are flexible circuit boards, and thus the first circuit board 391 and the second circuit board 392 can be folded. The first circuit board 391 is a circuit board for mounting a motor driving circuit, the second circuit board 392 is a circuit board for mounting hall elements, and the connecting portion 393 is used for transmitting power and/or signals between the motor driving circuit and the hall elements. Of course, the positions of the first circuit board 391 and the second circuit board 392 may be configured as required, for example, the positions of the two may be exchanged.

A plurality of electronic components 394 are provided on both surfaces of the first circuit board 391, where the electronic components 394 are not merely a component but a general term for components used in a driving circuit, and for example, the electronic components 394 may be electronic components such as a power control IC and a DC-DC converter. The electronic component 394 may also include a plurality of MOS transistors. The plurality of MOS transistors may be integrated in a chip or separately provided on the first circuit board 391. The first circuit board 391 is disposed on the first end wall 3111 of the circuit board support portion 311. The electronic component 394 on the surface of the first circuit board 391 adjacent to the circuit board supporting portion 311 is received in the receiving slot 3114, and the slot 3115 can be used for dissipating heat from the electronic component or the first circuit board 391.

The second circuit board 392 is provided with three hall elements 395 for detecting the rotational position of the rotor magnet 17. The three hall elements 395 are arranged at 60 degrees intervals. In other embodiments, the number of hall elements 395 can be set as desired, and their positions can be arranged in other ways, such as 120 degrees apart. The second circuit board 392 is disposed on the second end wall 3112 of the circuit board support portion 311. Three positioning holes 396 are formed in the second circuit board 392 corresponding to the three positioning posts 3117. The positioning posts 3117 correspondingly pass through the positioning holes 396 to position the second circuit board 392 on the circuit board supporting portion 311. The first circuit board 391 and the second circuit board 392 at least partially overlap each other along the central axis, and in the present embodiment, the first circuit board 391 and the second circuit board 392 are substantially parallel to each other and spaced apart from each other, and substantially overlap each other along the central axis, that is, the first circuit board 391 and the second circuit board 392 are coaxial and have substantially the same outer diameter.

The connection portion 393 passes through the notch portion 3119 of the board support portion 311 and is located at one side of the board support portion 311. The connecting portion 393 electrically connects the first circuit board 391 and the second circuit board 392, thereby connecting the driving circuit on the first circuit board 391 and the hall element 395 on the second circuit board 392.

The cover 70 is connected to the circuit board support portion 311 and receives the first circuit board 391. The periphery of the cover 70 is formed with a first latch 71 and three second latches 73 projecting in a direction parallel to the central axis thereof. The first locking portion 71 is disposed corresponding to the notch portion 3119 and is locked in the notch portion 3119, so that the connecting portion 393 is located between the circuit board supporting portion 311 and the first locking portion 71. The first catching portion 71 covers the connecting portion 393 to prevent the connecting portion 393 from moving. The three second latching portions 73 are respectively provided corresponding to the three engaging grooves 3118, and are respectively latched into the corresponding engaging grooves 3118. A step surface 711 coplanar with the contact surface 3110 is formed on the outer wall of the first latch portion 71, and an end surface 731 of the second latch portion 73 is coplanar with the contact surface 3110. The surfaces of the first and

second locking portions

71 and 73 contacting the circuit board support portion 311 may be inclined surfaces or interference fit, so as to increase the firmness of the locking. In other embodiments, the number of the second latching portion 73 or the engaging groove 3118 may be at least one. In other embodiments, the cover 70 and the circuit board support portion 311 may be connected by screw locking, welding, or the like.

The cover 70 is further provided with a wire passing groove 77, a wire passing block 79 with a corresponding shape is arranged in the wire passing groove 77, and a wire passing hole (not shown) is formed in the wire passing block 79, so that when wiring from the circuit board 39 is needed, a cable passes through the wire passing groove 77 and the wire passing block 79 and then is sealed by glue, for example, the cable can be used for passing through a cable for testing in occasions needing testing.

Referring to fig. 2, 3 and 5 again, the motor housing 50 is substantially hollow and cylindrical, and accommodates the rotating component 10 and the stationary component 30, and allows the rotating shaft 11 to extend. The motor housing 50 includes a peripheral wall 51, an end wall 53 provided at one end of the peripheral wall 51, and an extension wall 55 extending from the end wall 53 in the central axis direction. The peripheral wall 51 is substantially cylindrical, and an inner space thereof accommodates the holder 13, the rotor magnet 17, the stator core 33, the coil 35, the intermediate section of the rotating shaft 11, the second circuit board 392, the receiver 15, and the support 31. One end of the peripheral wall 51, which is far from the end wall 53, is sleeved on the circuit board supporting part 311 and abuts against the abutting surface 3110 of the peripheral wall 3113, the step surface 711 of the first latching part 71 and the end surface 731 of the three second latching parts 73. In other embodiments, the motor housing 50 may not be connected to the cover 70 through the circuit board support portion 311, and the motor housing 50 may also be connected to the cover 70 through a snap, a magnetic attraction, a welding, or the like.

The end wall 53 is formed by extending the end of the peripheral wall 51 away from the circuit board 39 in the radial direction, and a through hole 530 is formed in the center of the end wall for the rotation shaft 11 to pass through the through hole 530. The extension wall 55 is formed by extending the inner edge of the end wall 53 (i.e., the side of the through hole 530) along the parallel center axis, and the rotation shaft 11 passes through the middle of the extension wall 55. One of the two rolling bearings 37 is fitted over the rotating shaft 11 and is located between the rotating shaft 11 and the extension wall 55 to support the rotating shaft 11.

The gearbox 200 includes a gearbox housing 20, an end cap 40, a variator 60, an output shaft 80 and a rolling bearing 86. The outer diameter of the transmission case 20 is substantially equal to the outer diameter of the peripheral wall 51 of the motor case 50. An inner circumferential ring 21 is formed on the inner circumferential wall of the transmission case 20. The gearbox housing 20 is designed as a whole to achieve the dustproof and waterproof effect. In other embodiments, the transmission housing 20 may also be assembled from multiple parts. In other embodiments, the transmission 60 is a three-speed transmission.

The end cap 40 is received in the end of the gearbox housing 20 adjacent the motor 100 and is secured to the gearbox housing 20 by fasteners. The end cap 40 fits over the extended wall 55 of the motor housing 50 and abuts against the end wall 53 of the motor housing 50. Another fastener passes through the end cap 40 and the end wall 53 to secure the end cap 40 to the end wall 53.

Referring to fig. 10 and 11, the three-stage transmission 60 is accommodated in the transmission case 20, and the three-stage transmission 60 is a three-stage planetary transmission structure and includes three sun gears 61, three planetary gears 63, and three planetary carriers 65. One of the three sun gears 61 is fixedly sleeved on the end part of the rotating shaft 11 close to the gearbox 200, and the other two sun gears 61 and two of the three planet carriers 65 are respectively designed into a whole. For convenience of description, the three sun gears 61 are sequentially named as a first sun gear 611, a second sun gear 612 and a third sun gear 613 from the sun gear 61 near the rotating shaft 11, similarly, the three planetary gears 63 are sequentially named as a first planetary gear 631, a second planetary gear 632 and a third planetary gear 633, and the three planetary gears 65 are sequentially named as a first planetary gear carrier 651, a second planetary gear carrier 652 and a third planetary gear carrier 653. Wherein each set of planet wheels 63 comprises three planet wheels. In the present embodiment, the three sun gears 61, the three sets of planet gears 63, and the three planet carriers 65 are all made of powder metallurgy.

A first sun gear 611 is fixed to the rotating shaft 11, and a first group of planet gears 631 are arranged around the first sun gear 611 and mesh with the first sun gear 611 and the ring gear 21. The first planet carrier 651 is located at one side of the first set of planet gears 631 and the first sun gear 611, and the first set of planet gears 631 are respectively assembled with the first planet carrier 651 by pins. The second sun gear 612 is designed in one piece with the first planet carrier 651 and is located on the side of the first planet carrier 651 facing away from the first sun gear 611. In other embodiments, the second sun gear 612 may not be integrally designed with the first carrier 651, and the second sun gear 612 may be assembled to the first carrier 651.

A second set of planet gears 632 is disposed around the second sun gear 612 and is in meshing engagement with the second sun gear 612 and the ring gear 21. The second planet carrier 652 is located at one side of the second set of planet gears 632 and the second sun gear 612, and the second set of planet gears 632 are respectively assembled with the second planet carrier 652 through pin shafts. The third sun gear 613 is designed in one piece with the second planet carrier 652 and is located on the side of the second planet carrier 652 facing away from the second sun gear 612. In another embodiment, the third sun gear 613 may be assembled to the second carrier 652. The first sun gear 611, the second sun gear 612, and the third sun gear 613 are all disposed along the central axis of the transmission case.

A third set of planet gears 633 is arranged around the third sun gear 613 and is in mesh with the third sun gear 613 and the ring gear 21. A third planet carrier 653 is located at one side of the third set of planet wheels 633 and the third sun wheel 613, and the third set of planet wheels 633 are respectively assembled with the third planet carrier 653 through pins.

Further, spacers 67 are disposed between the first set of planet gears 631 and the end cover 40, between the second set of planet gears 632 and the first planet carrier 651, and between the third set of planet gears 633 and the second planet carrier 652. Additionally, in other embodiments, spacers can be disposed between the first set of planet gears 631 and the first carrier 651, between the second set of planet gears 632 and the second carrier 652, and between the third set of planet gears 633 and the third carrier 653. The gasket may be made of stainless steel.

The output shaft 80 is disposed along the central axis of the transmission and is fixedly connected to the third carrier 653 and extends from the transmission housing 20. The output shaft 80 is provided with a snap spring near the gearbox housing 20. In the present embodiment, the number of the rolling bearings 86 is two, and the two rolling bearings 86 are sleeved on the output shaft 80 and located between the transmission case 20 and the output shaft 80 to support the output shaft 80 and realize the rotation of the output shaft 80. In the present embodiment, the output shaft 80, the rotating shaft 11, and the pin are made of steel.

Referring to fig. 1 and 5, further, the driving mechanism 1 further includes a plastic film 300, and the plastic film 300 is wrapped on the motor 100 and the transmission case 200 to achieve the waterproof, dustproof, and shockproof effects. In this embodiment, the plastic film 300 covers the entire outer peripheral wall of the motor 100 and the entire outer peripheral wall of the transmission case 200, and may play a role in fixing the entire driving mechanism. In other embodiments, the plastic film 300 may only cover the outer wall of the connection between the motor 100 and the transmission case 200 or other parts. In the present embodiment, the plastic film 300 is a PET film. It is understood that in other embodiments, the plastic film 300 may be made of other materials. In other embodiments, the motor 100 and the transmission case 200 may be wrapped with plastic films 300, respectively.

The axial length L of the drive mechanism 1 is not less than 45mm (excluding the output shaft protruding part), for example, the axial length L of the drive mechanism 1 is 52 ± 4mm (L does not include the length of the output shaft protruding part), and specifically, may be 48mm, 49mm, 49.5mm, 50mm, 50.5mm, 51mm, 51.5mm, 51.8mm, 52mm, 52.3mm, 52.8mm, 53mm, 54mm, or the like. I.e. the sum of the axial lengths of the motor housing 50, the cover 70 and the gearbox housing 20 is greater than 45 mm. For example, the total axial length of the motor housing 50, the cover 70 and the transmission housing 20 is 52 ± 4mm, and specifically, 48mm, 49mm, 49.5mm, 50mm, 50.5mm, 51mm, 51.5mm, 51.8mm, 52mm, 52.3mm, 52.8mm, 53mm, 54mm, etc. may be used.

In other embodiments, the axial length L of the drive mechanism 1 (L excluding the length of the output shaft extension) may be less than or equal to 52 mm. For example, 48mm, 49mm, 49.5mm, 50mm, 50.5mm, 51mm, 51.5mm, 51.8mm, 51.9mm, 52mm, i.e., the sum of the axial lengths of the motor housing 50, the cover 70, and the transmission housing 20 is less than or equal to 52 mm.

The outer diameter of the motor 100 and/or the outer diameter of the gearbox 200 (i.e. the outer diameter of the drive mechanism 1) is 16 ± 1.0mm, for example 15mm, 15.5mm, 16mm, 16.2mm, 16.5mm, 17 mm. In other embodiments, the outer diameter of the motor 100 and/or the gearbox 200 (i.e. the outer diameter of the drive mechanism 1) may be less than or equal to 16 mm. For example, it may be 14mm, 15mm, 15.5mm, 15.9mm, 16 mm.

In the length dimension range of the present embodiment of the driving mechanism 1, for example, when the axial length L of the driving mechanism 1 is less than or equal to 52 and the outer diameter of the driving mechanism 1 is less than or equal to 16mm, the gearbox 200 of the three-stage transmission 60 can achieve better performance such as efficiency and speed, and at this time, the length of the gearbox 200 ranges from 20.5mm to 28.5mm, for example, the length of the gearbox 200 may be 20.5mm, 21mm, 22.5mm, 23mm, 23.5mm, 24.5mm, 25mm, 25.5mm, 26mm, 26.5mm, 27mm, 28mm, and 28.5 mm. Preferably, the gearbox 200 is 26.5mm in length. The length of the motor 100 ranges from 23.5mm to 31.5mm, and preferably, the length of the motor 100 is 25.5 mm. Let the performance evaluation ratio of the drive mechanism 1 of the three-stage transmission 60 be as follows.

The drive mechanism 1 has a transmission ratio of 180-250 which can be achieved by three-stage transmission, for example, the transmission ratio can be 180, 190, 200, 205, 210, 220, 230, 240, 250, etc., wherein the transmission ratio refers to the speed ratio in mechanical transmission. The motor torque can be 2.77mNm to 3.85mNm, for example, the motor torque can be 2.77mNm, 2.95mNm, 3.0mNm, 3.35mNm, 3.55mNm, 3.85mNm, etc.

The output torque of the gearbox (i.e. of the entire drive 1) is 0.3-1.0 Nm, which may be 0.5Nm, for example.

The efficiency in the performance evaluation described above is merely exemplary of one, and in other embodiments, the transmission efficiency may range from 65% to 85%, e.g., the transmission efficiency may be 69%, 70%, 71%, 71.5%, 71.9%, 72%, 72.2%, 72.5%, 73%, 75%, 80%, etc. The motor efficiency may range from 60 ± 5%, e.g., the motor efficiency may be 55%, 57%, 60%, 62%, 65%, etc. The total efficiency can range from greater than or equal to 40%, e.g., the total efficiency can be 40%, 41%, 42%, 43%, 44%, 45%, 46%, 48%, etc.

When the three-stage transmission is used, after the motor 100 is electrified, the rotating shaft 11 rotates, the rotating shaft serves as an input shaft of the gearbox 200, the three-stage transmission 60 is driven to transmit, and the motion is transmitted to the output shaft 80 and is output from the output shaft 80.

One of the ways of assembling the drive mechanism 1 of the present invention is provided herein, it being understood that the assembly may not be fixed in the following order or direction, etc.

Mounting the circuit board 39 on the circuit board supporting portion 311 with the connecting portion 393 passing through the notch portion 3119, covering the circuit board 39 and the circuit board supporting portion 311 with the cover 70, and covering the connecting portion 393 with the first locking portion 71; winding the coil 35 around the stator core 33, and then sleeving the stator core 33 on the stator support part 313; sleeving the bearing piece 15 on the rotating shaft 11, fixing the rotor magnet 17 on the retainer 13, and then fixing the bearing piece 15 with the retainer 13 in a riveting mode; a rolling bearing 37 is fitted into the through-hole 317 from the end of the support member 31 remote from the stator support portion 313, and then the rotating shaft 11 is inserted into the through-hole 317 and the rolling bearing 37 fitted in the through-hole 317 from the end of the support member 31 remote from the circuit board support portion 311; another rolling bearing 37 is fitted over the shaft 11 adjacent the socket 15 and the motor housing 50 is fitted over the rotating assembly 10 and the stationary assembly 30. Sleeving the end cover 40 on the rotating shaft 11 and fixing the end cover with the motor shell 50; connecting the transmission 60 with the rotating shaft 11 and the output shaft 80; two rolling bearings 86 are sleeved on the output shaft 80; sleeving the gearbox shell 20 on the end cover 40, the speed changer 60, the output shaft 80 and the rolling bearing 86, and fixing the gearbox shell and the end cover 40; finally, plastic film is coated on the gearbox housing 20 and the motor housing 50.

In the driving mechanism 1, the motor housing 50 of the motor 100 is connected to the cover 70, so that the internal components are accommodated in the motor housing 50 and the cover 70, thereby achieving the dustproof and waterproof effects. The motor housing 50 and the cover 70 are engaged with each other by the support member 31, so that the assembly is convenient, the number of components can be reduced, and the size of the motor 100 can be reduced. Two rolling bearings 37 are fitted at both ends of the rotating shaft 11, avoiding the position of the stator core 33, thereby reducing the size of the motor 100, particularly the size of the motor 100 in the radial direction. The first circuit board 391 and the second circuit board 392 are connected by the connecting part 393, actions of searching corresponding welding points, inserting components, welding cables and the like in the prior art when cables are used for connection are avoided, the manufacturing process is simplified, and errors of wiring and assembly are reduced. The connecting portion 393 has advantages of high wiring density, light weight, thin thickness, less wiring space limitation, high flexibility, and the like. In the case where the overall size of the drive mechanism 1 is within a certain range, the transmission case 200 is provided with the three-stage transmission 60 (i.e., approximately 26.5mm in length), and can achieve a large power and efficiency. The motor 100 and the gearbox 200 are coated with plastic films 300, so that the dustproof and waterproof effects are further improved.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.

Claims

1. A kind of actuating mechanism, including change-speed gear box and motor, characterized by: the motor includes a rotating assembly rotating around a central axis thereof, a stationary assembly supporting the rotating assembly, a motor housing accommodating at least a portion of the rotating assembly, and a cover connected to the motor housing, the rotating assembly including:

a holder that rotates together with the rotating shaft; and

a rotor magnet held by the holder;

the stationary assembly includes:

a stator core;

a plurality of coils wound around the stator core;

a circuit board electrically connected to the coil, the circuit board including a first circuit board, a second circuit board, and a connection part connecting the first circuit board and the second circuit board; and

a support member that supports the stator core and the circuit board, the support member including a circuit board support portion;

the periphery of the cover body is further convexly extended along the direction parallel to the central axis to form at least one second clamping part, the peripheral wall of the supporting piece is recessed along the radial direction to form at least one clamping groove, and the at least one second clamping part is clamped into the at least one clamping groove;

a notch is formed in one peripheral wall of the circuit board supporting portion, the connecting portion of the circuit board penetrates through the notch, a first buckling portion is formed on the periphery of the cover body in a protruding mode in the direction parallel to the central axis, the first buckling portion is clamped into the notch, and the connecting portion is located between the circuit board supporting portion and the first buckling portion.

2. The drive mechanism as recited in claim 1, wherein: the supporting piece supports the first circuit board and the second circuit board, one end of the connecting part is connected with the first circuit board, the other end of the connecting part is connected with the second circuit board, the first circuit board is a circuit board for mounting a motor driving circuit, the second circuit board is a circuit board for mounting a Hall element, and the connecting part is used for realizing the transmission of electric power and/or signals between the motor driving circuit and the Hall element.

3. The drive mechanism as recited in claim 2, wherein: the circuit board is a flexible circuit board, or the first circuit board and the second circuit board are flexible circuit boards, or the connecting part is made of flexible materials.

4. The drive mechanism as recited in claim 2, wherein: the circuit board support part comprises a first end wall, a second end wall and a peripheral wall, wherein the first end wall and the second end wall are opposite, the peripheral wall is used for connecting the first end wall and the second end wall, and the first circuit board and the second circuit board are respectively arranged on two sides of the first end wall and the second end wall.

5. The drive mechanism as claimed in any one of claims 1 to 4, wherein: the circumferential wall of the circuit board supporting part is radially recessed to form the at least one clamping groove.

6. The drive mechanism as recited in claim 5, wherein: the motor shell is sleeved on the circuit board supporting part and abuts against the abutting surface, the step surface and the end surface of the at least one second clamping part.

7. The drive mechanism as recited in claim 1, wherein: the motor further comprises two rolling bearings, one of the two rolling bearings of the motor is arranged between the rotating shaft and the motor shell, the other rolling bearing of the motor is arranged between the rotating shaft and the supporting piece, and the two rolling bearings of the motor are respectively positioned at two ends of the rotating shaft.

8. The drive mechanism as recited in claim 1, wherein: the gearbox comprises a gearbox shell, a speed changer and an output shaft, wherein the speed changer is accommodated in the gearbox shell, the output shaft is connected with the speed changer, and the number of the speed changer is two, three or four.

9. The drive mechanism as recited in claim 8, wherein: the transmission is a three-speed transmission.

10. The drive mechanism as recited in claim 9, wherein: an inner gear ring is formed on the inner peripheral wall of the gearbox shell, and the three-stage transmission is of a three-stage planetary transmission structure and is meshed with the inner gear ring.

11. The drive mechanism as recited in claim 10, wherein: the three-stage transmission comprises three sun wheels, three groups of planet wheels and three planet carriers, wherein the three groups of planet wheels are respectively meshed with the corresponding sun wheels and the corresponding inner gear rings, and each group of planet wheels is respectively connected with the corresponding planet carrier.

12. The drive mechanism as recited in claim 11, wherein: the three sun gears are respectively a first sun gear, a second sun gear and a third sun gear, the three planet carriers are respectively a first planet carrier, a second planet carrier and a third planet carrier, the second sun gear and the first planet carrier are integrally designed, and the third sun gear and the second planet carrier are integrally designed.

13. The drive mechanism as recited in claim 12, wherein: and a gasket is arranged between the second group of planet wheels and the first planet carrier and/or between the third group of planet wheels and the second planet carrier.

14. A drive mechanism as claimed in claim 11 or 12, wherein: at least one sun gear of the three sun gears, at least one group of planet gears of the three groups of planet gears, or at least one planet carrier of the three planet carriers is made by powder metallurgy.

15. The drive mechanism as recited in any one of claims 8-12, wherein: the gearbox further comprises an end cover, and the end cover is accommodated in the gearbox shell and fixed with the gearbox shell.

16. The drive mechanism as recited in any one of claims 8-12, wherein: the gearbox also comprises a rolling bearing which is sleeved on the output shaft and is positioned between the gearbox shell and the output shaft.

17. The drive mechanism as recited in any one of claims 8-12, wherein: the gearbox shell is designed as a whole.

18. The drive mechanism as recited in claim 1, wherein: including the motor and with the gearbox that the motor is connected, actuating mechanism's length is not less than 45mm, the length of gearbox is 20.5mm ~28.5 mm.

19. The drive mechanism as recited in claim 1, wherein: the length of actuating mechanism is one in 48mm, 49mm, 49.5mm, 50mm, 50.5mm, 51mm, 51.5mm, 51.8mm, 52mm, 52.3mm, 52.8mm, 53mm, 54mm, the length of gearbox is one in 20.5mm, 21mm, 22.5mm, 23mm, 23.5mm, 24.5mm, 25mm, 25.5mm, 26mm, 26.5mm, 27mm, 28mm, 28.5 mm.

20. The drive mechanism as recited in claim 1, wherein: the total length of the gearbox and the motor is less than or equal to 52 mm.

21. The drive mechanism as recited in any one of claims 18-20, wherein: the efficiency of the gearbox is 65% -85%.

22. The drive mechanism as recited in claim 21, wherein: the gearbox efficiency is one of 69%, 70%, 71%, 71.5%, 71.9%, 72%, 72.2%, 72.5%, 73%, 75%, 80%.

23. The drive mechanism as recited in claim 21, wherein: the overall efficiency of the drive mechanism is greater than or equal to 40%.

24. The drive mechanism as recited in any one of claims 18-20, wherein: the efficiency of the motor is 55% -65%.

25. The drive mechanism as recited in claim 24, wherein: the efficiency of the motor is one of 55%, 57%, 60%, 62%, 65%.

26. The drive mechanism as recited in any one of claims 18-20, wherein: the transmission ratio of the driving mechanism is 180-250.

27. The drive mechanism as recited in any one of claims 18-20, wherein: the torque of the motor is 2.77-3.85 mNm, and the output torque of the gearbox is 0.3-1.0 Nm.

28. The drive mechanism as recited in any one of claims 18-20, wherein: the outer diameter of the driving mechanism is less than or equal to 16 mm.

29. The drive mechanism as recited in any one of claims 18-20, wherein: the gearbox comprises a gearbox shell, a speed changer and an output shaft, wherein the speed changer is accommodated in the gearbox shell, the output shaft is connected with the speed changer, the length of the gearbox is the length of the gearbox shell, and the length of the gearbox shell is 20.5 mm-28.5 mm.

30. The drive mechanism as recited in claim 29, wherein: the transmission housing is one of 24.5mm, 25mm, 25.5mm, 26mm, 26.5mm, 27mm, 28mm, 28.5mm in length.

31. The drive mechanism as recited in any one of claims 18-20, wherein: the motor and the gear box are coated with plastic films.

32. The drive mechanism as recited in claim 31, wherein: the plastic film is a PET film.

33. The drive mechanism of claim 1, comprising a motor and a gearbox coupled to the motor, wherein: the transmission ratio of the driving mechanism is 180-250, and the efficiency of the gearbox is 65-85%.

34. The drive mechanism as recited in claim 33, wherein: the overall efficiency of the drive mechanism is greater than or equal to 40%.

35. The drive mechanism as recited in claim 33, wherein: the gearbox efficiency is one of 69%, 70%, 71%, 71.5%, 71.9%, 72%, 72.2%, 72.5%, 73%, 75%, 80%.

36. The drive mechanism as recited in any one of claims 33-35, wherein: the length of the gearbox is 20.5 mm-28.5 mm.

37. The drive mechanism as recited in any one of claims 33-35, wherein: the gearbox comprises a gearbox shell, a transmission and an output shaft connected with the transmission, the transmission is accommodated in the gearbox shell, the motor is connected with the transmission, and the transmission is a three-stage transmission.