Rotary drive device, side door drive assembly and automobile body

Abstract

The utility model provides a kind of rotary drive device, side door drive assembly and automobile body, rotary drive device includes shell, motor assembly and speed reducer, motor assembly and speed reducer are all set in shell, motor assembly includes rotor shaft, magnetic piece, stator core, stator end cover and multiple stator windings, magnetic piece is sleeved on rotor shaft and has multiple magnetic poles distributed along circumference, stator core is around magnetic piece and is fixedly arranged in shell, multiple stator windings are distributed along circumference and are all wound on stator core, stator end cover is fixedly arranged between stator core and speed reducer, and the outside edge of stator end cover is connected with the inner wall of shell, stator end cover is formed with shaft avoiding hole, one end of rotor shaft passes through shaft avoiding hole and is connected with speed reducer.In the utility model provided, stator end cover is arranged between the stator core of motor assembly and speed reducer, can effectively prevent the lubricating grease of speed reducer from entering motor assembly, ensure the service life of motor assembly.

Description

Technical Field

[0001] This utility model relates to the field of automotive equipment, specifically to a rotary drive device, a side door drive assembly, and an automotive body. Background Technology

[0002] In vehicles with larger and wider bodies, sliding doors are typically used on both sides of the rear passenger area to ensure smooth entry and exit and to prevent the doors from being restricted by the surrounding space. Compared with traditional rotating side doors, sliding doors can be smoothly pushed open and pulled open even when the vehicle is in a confined space, ensuring a better user experience.

[0003] To further optimize the user experience, a motor can also be installed on the side of the vehicle to drive the side door to open and close automatically. Specifically, the motor and reducer drive the actuator (such as a pulley mechanism) to drive the side door to move linearly.

[0004] However, existing automotive side door motor structures often experience jamming issues after a period of use, requiring irregular maintenance or replacement, which affects the user experience.

[0005] Therefore, improving the stability of automotive side door motors has become a pressing technical problem to be solved in this field. Utility Model Content

[0006] This utility model aims to solve one of the technical problems in related technologies to a certain extent. To this end, this utility model provides a rotary drive device, a side door drive assembly, and an automobile body. The rotary drive device has a stator end cover between the stator core and the reducer, which can prevent lubricating grease in the reducer from entering the motor assembly and ensure the service life of the motor assembly.

[0007] To achieve the above objectives, as one aspect of this utility model, a rotary drive device is provided, comprising a housing, a motor assembly, and a reducer. Both the motor assembly and the reducer are disposed within the housing. The motor assembly includes a rotor shaft, a magnetic component, a stator core, a stator end cover, and multiple stator windings. The magnetic component is sleeved on the rotor shaft and has multiple magnetic poles distributed circumferentially. The stator core surrounds the magnetic component and is fixedly disposed within the housing. The multiple stator windings are distributed circumferentially and wound around the stator core. The stator end cover is fixedly disposed between the stator core and the reducer, and the outer edge of the stator end cover is connected to the inner wall of the housing. A shaft clearance hole is formed in the stator end cover, and one end of the rotor shaft passes through the shaft clearance hole and connects to the reducer.

[0008] Optionally, the stator core includes a plurality of stator laminations stacked along the axial direction.

[0009] Optionally, the motor assembly further includes a top bearing and a bottom bearing. The inner ring structure of the top bearing and the inner ring structure of the bottom bearing are both sleeved on the rotor shaft, and the top bearing and the bottom bearing are respectively located on both sides of the magnetic component along the axial direction of the rotor shaft. The outer ring structure of the top bearing is fixedly connected to the stator end cover, and the outer ring structure of the bottom bearing is fixedly connected to the housing.

[0010] Optionally, the top bearing is a deep groove ball bearing.

[0011] Optionally, the bottom bearing is a deep groove ball bearing.

[0012] Optionally, the stator end cover includes a cover plate and a first bearing sleeve. The cover plate is fixedly disposed between the stator core and the reducer, and the shaft clearance hole is formed on the cover plate. The first bearing sleeve is fixedly disposed on the side of the cover plate away from the reducer, and the first bearing sleeve surrounds the shaft clearance hole. The outer ring structure of the top bearing is fixedly disposed in the first bearing sleeve.

[0013] Optionally, the inner wall of the housing on the side away from the reducer has a second bearing sleeve, and the outer ring structure of the bottom bearing is fixedly disposed in the second bearing sleeve.

[0014] Optionally, the housing includes a housing base and a top cover. The motor assembly and the reducer are both disposed in the housing base. The top of the housing base has a top opening. The top cover is fixedly connected to the housing base and closes the top opening. An output through hole is formed on the top cover. The output shaft of the reducer passes through the output through hole to the outside of the housing.

[0015] The inner wall of the housing has a positioning step surface facing the opening at the top of the housing. The outer edge of the stator end cover contacts the inner wall of the housing, and the bottom surface of the stator end cover abuts against the positioning step surface. The stator end cover has a plurality of end cover mounting holes that extend axially. The rotary drive device also includes a plurality of mounting fasteners, which pass through the plurality of end cover mounting holes one by one and are fixedly connected to the housing.

[0016] Optionally, the stator core includes a connecting cylinder, multiple winding sections and multiple winding mounting sections. The connecting cylinder surrounds the outside of the rotor shaft and the magnetic component. The multiple winding sections are distributed circumferentially and connected to the outside of the connecting cylinder. The multiple stator windings are respectively wound on the multiple winding sections.

[0017] Multiple winding mounting portions are connected to the outside of multiple winding portions. Stator mounting through holes are formed in the winding mounting portions. Multiple mounting fasteners pass through multiple end cover mounting holes of the stator end cover and multiple stator mounting through holes of the stator core in sequence and are fixedly connected to the housing.

[0018] Optionally, the stator end cover includes a cover plate and a plurality of first positioning platforms. The plurality of first positioning platforms are fixedly disposed on the side of the stator end cover facing the winding mounting portion. The plurality of end cover mounting holes penetrate the stator end cover and the plurality of first positioning platforms. The bottom wall of the housing has a plurality of second positioning platforms. The positions of the second positioning platforms correspond one-to-one with the positions of the plurality of first positioning platforms. The side of the second positioning platform facing the stator end cover has a threaded hole. The mounting fastener is a screw. The plurality of mounting fasteners pass sequentially through the plurality of end cover mounting holes and the plurality of stator mounting through holes and are screwed into the threaded holes of the plurality of second positioning platforms.

[0019] Optionally, the bottom wall of the housing also has an assembly through hole that penetrates the bottom wall of the housing.

[0020] Optionally, the reducer is a planetary gear reducer, and the rotor shaft is fixedly connected to the sun gear of the reducer.

[0021] Optionally, the rotary drive device further includes a first limiting ball, which is disposed between the central shaft or planetary carrier of the reducer and the rotor shaft; the end face of the rotor shaft facing one end of the reducer has a first limiting groove, and the first limiting ball is partially accommodated in the first limiting groove, and / or

[0022] A second limiting groove is formed on the surface of the central shaft or the planetary carrier facing the rotor shaft, and the first limiting ball is partially accommodated in the second limiting groove.

[0023] As a second aspect of this utility model, a side door drive assembly is provided, including an actuator and the aforementioned rotary drive device. The rotary drive device is fixedly connected to one of the side door and the passenger compartment of a vehicle. The actuator is connected to the other of the side door and the passenger compartment. The actuator is connected to the output shaft of the reducer in the rotary drive device and is capable of converting the rotational motion of the reducer output shaft into a sliding motion of the side door relative to the passenger compartment.

[0024] As a third aspect of this utility model, a car body is provided, including a passenger compartment and at least one side door, the side door being disposed on the side of the passenger compartment and movably connected to the passenger compartment, the car body further including the aforementioned side door drive assembly, the side door drive assembly being connected between the side door and the passenger compartment.

[0025] In the rotary drive device, side door drive assembly and automobile body provided by this utility model, the motor assembly and the reducer are both housed in the housing. The rotor shaft of the motor assembly is directly connected to the reducer, which eliminates the axial length required for stacking the housings of the motor assembly and the reducer along the axial direction, thereby reducing the overall size of the rotary drive device and facilitating the compact design of the vehicle side door.

[0026] Furthermore, due to the differences in speed and transmission structure between the motor assembly and the reducer, the reducer needs to be lubricated with a specific grade of grease. If the grease in the reducer enters the motor assembly, it will cause abnormal changes in the damping of the motor assembly, affecting the motor speed and transmission effect. In addition, the thickness of the back mold in the reducer will also change, which will aggravate the wear between the gears in the reducer and cause problems such as jamming and shutdown.

[0027] In this invention, the stator end cover is positioned between the stator core of the motor assembly and the reducer, thereby dividing the internal space of the housing into two chambers that respectively accommodate the motor assembly and the reducer. The two chambers are connected only through a shaft clearance hole reserved for the rotor shaft. During the operation of the rotary drive device, the components in the reducer rotate, and the centrifugal force keeps the lubricating grease around the corresponding chamber of the reducer, thus preventing the lubricating grease from flowing into the motor assembly through the shaft clearance hole of the stator end cover. Furthermore, the outer edge of the stator end cover is connected to the inner wall of the housing, which can also effectively block the lubricating grease from flowing into the motor assembly. This effectively prevents the lubricating grease in the reducer from entering the motor assembly, thereby ensuring the transmission efficiency of the rotary drive device, delaying the wear and deterioration of the gear components in the reducer, ensuring the service life of each component in the reducer, and improving the overall stability of the rotary drive device.

[0028] In addition, the motor assembly adopts a brushless motor design, with its windings fixedly installed in the housing, and the magnetic structure, which is a permanent magnet, is fixed on the rotor shaft and rotates with the rotor shaft. The resistance generated by the brushless motor when reversing is less than that of the brushed motor. Therefore, the rotary drive device provided by this utility model can be directly connected to the actuator of the vehicle side door, eliminating intermediate structures such as clutches and further improving the compactness of the vehicle side door structure. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the internal structure of the rotary drive device provided in this embodiment of the utility model;

[0031] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the rotating drive device;

[0032] Figure 3 This is a structural disassembly diagram of the stator portion of the motor assembly in the rotary drive device provided in this embodiment of the utility model;

[0033] Figure 4 This is a schematic diagram showing the connection relationship between the stator end cover and the housing in the rotary drive device provided in this embodiment of the utility model;

[0034] Figure 5 This is a partial structural diagram of a car body provided in one embodiment of the present invention;

[0035] Figure 6 This is a partial structural diagram of a car body provided in another embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] Housing 100; Housing base 110; Positioning groove 111; Top cover 120; Annular positioning boss 121; Motor assembly 200; Circuit board 201; Control cable 202; Rotor shaft 210; Magnetic component 220; Stator core 230; Stator winding 240; Top stator support 251; Bottom stator support 252; Stator end cover 260; Cover plate 261; First bearing cylinder 262; First positioning platform 263; Top bearing 271; Bottom bearing 27 2; Reducer 300; Central shaft 310; Planetary carrier 320; Gear mounting hole 321; First weight reduction hole 322; Bearing clearance groove 323; Gear ring 330; Gear ring body 331; Positioning protrusion 332; Planetary gear 340; Second weight reduction hole 341; Gear shaft 350; Assembly section 351; Mating section 352; Limiting section 353; Output bearing 410; First limiting ball 510; Mounting fastener 520; Positioning step surface a. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0039] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this utility model. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0040] In related technologies, to shorten the overall size of the motor, the stator, rotor, and reducer are often housed in the same casing to save the extra space occupied by the axial stacking of the motor and reducer casings. However, this design carries the risk of lubricating grease from the reducer entering the motor, which can easily lead to increased damping of the motor components, reduced lubricating grease in the reducer, and changes in film thickness. This affects the motor's transmission efficiency and the lifespan of components in the reducer, ultimately resulting in poor overall motor stability.

[0041] To address the aforementioned technical problems, as one aspect of this utility model, a rotary drive device is provided, such as... Figures 1 to 4 As shown, the rotary drive device includes a housing 100, a motor assembly 200, and a reducer 300. Both the motor assembly 200 and the reducer 300 are disposed in the housing 100. The motor assembly 200 includes a rotor shaft 210, a magnetic element 220, a stator core 230, a stator end cover 260, and multiple stator windings 240. The magnetic element 220 is sleeved on the rotor shaft 210 and has multiple magnetic poles distributed circumferentially. The stator core 230 surrounds the magnetic element 220 and is fixedly disposed in the housing 100. The multiple stator windings 240 are distributed circumferentially and are all wound on the stator core 230. The stator end cover 260 is fixedly disposed between the stator core 230 and the reducer 300, and the outer edge of the stator end cover 260 is connected to the inner wall of the housing 100. A shaft clearance hole is formed in the stator end cover 260. One end of the rotor shaft 210 passes through the shaft clearance hole and is connected to the reducer 300.

[0042] In the rotary drive device provided by this utility model, the motor assembly 200 and the reducer 300 are both disposed in the housing 100. The rotor shaft 210 of the motor assembly 200 is directly connected to the reducer 300, which eliminates the axial length required for the housings 100 of the motor assembly 200 and the reducer 300 to be stacked axially, thereby reducing the overall size of the rotary drive device and facilitating the compact design of the vehicle side door.

[0043] Furthermore, due to the differences in speed and transmission structure between the motor assembly 200 and the reducer 300, the reducer 300 needs to be lubricated with a specific grade of lubricating grease. If the lubricating grease in the reducer 300 enters the motor assembly, it will cause abnormal changes in the damping of the motor assembly, affecting the motor speed and transmission effect. In addition, the oil film thickness in the reducer 300 will also change, aggravating the wear between the gears in the reducer and causing problems such as jamming and shutdown.

[0044] In this invention, the stator end cover 260 is positioned between the stator core 230 of the motor assembly 200 and the reducer 300, thereby dividing the internal space of the housing 100 into two chambers that respectively accommodate the motor assembly 200 and the reducer 300. The two chambers are connected only through a shaft clearance hole reserved for the rotor shaft 210. During the operation of the rotary drive device, the components in the reducer 300 rotate, and the centrifugal force keeps the lubricating grease around the corresponding chamber of the reducer 300, thereby preventing the reducer 300 from overheating. The lubricating grease from the 00 flows into the motor assembly 200 through the shaft clearance hole of the stator end cover 260. The outer edge of the stator end cover 260 is connected to the inner wall of the housing 100, which can also effectively block the flow of lubricating grease from the surrounding area into the motor assembly 200. This effectively prevents the lubricating grease in the reducer 300 from entering the motor assembly 200, thereby ensuring the transmission efficiency of the rotary drive device, delaying the wear and deterioration of the gear components in the reducer 300, ensuring the service life of each component in the reducer 300, and improving the overall stability of the rotary drive device.

[0045] In addition, the motor assembly 200 adopts a brushless motor design, with its windings fixedly installed in the housing 100, and the magnetic structure, which is a permanent magnet, is fixed on the rotor shaft 210 and rotates together with the rotor shaft 210. The resistance generated by the brushless motor when reversing is less than that of the brushed motor. Therefore, the rotary drive device provided by this utility model can be directly connected to the actuator of the vehicle side door, eliminating intermediate structures such as clutches and further improving the compactness of the vehicle side door structure.

[0046] As an optional embodiment of this utility model, such as Figures 1 to 4 As shown, the motor assembly 200 also includes a top bearing 271 and a bottom bearing 272. The inner ring structure of the top bearing 271 and the inner ring structure of the bottom bearing 272 are both sleeved on the rotor shaft 210. The top bearing 271 and the bottom bearing 272 are located on both sides of the magnetic component 220 along the axial direction of the rotor shaft 210. The outer ring structure of the top bearing 271 is fixedly connected to the stator end cover 260, and the outer ring structure of the bottom bearing 272 is fixedly connected to the housing 100.

[0047] In this embodiment of the utility model, the motor assembly 200 further includes a top bearing 271 and a bottom bearing 272. The top bearing 271 and the bottom bearing 272 are respectively connected to the stator end cover 260 at the top of the magnetic component 220 and the bottom wall of the housing 100 at the bottom of the magnetic component 220. This extends the distance between the two bearings as much as possible without increasing the overall axial length of the rotary drive device, improves the accuracy of limiting the position of the rotor shaft 210 by the top bearing 271 and the bottom bearing 272, and thus improves the operating stability and control accuracy of the rotary drive device.

[0048] Optionally, the top bearing 271 is a deep groove ball bearing.

[0049] Optionally, the bottom bearing 272 is a deep groove ball bearing.

[0050] As an optional embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 3 As shown, the stator end cover 260 includes a cover plate 261 and a first bearing sleeve 262. The cover plate 261 is fixedly disposed between the stator core 230 and the reducer 300, and a shaft clearance hole is formed on the cover plate 261. The first bearing sleeve 262 is fixedly disposed on the side of the cover plate 261 away from the reducer 300, and the first bearing sleeve 262 surrounds the shaft clearance hole. The outer ring structure of the top bearing 271 is fixedly disposed in the first bearing sleeve 262.

[0051] Optionally, such as Figures 1 to 2 As shown, the inner wall of the housing 100 away from the reducer 300 has a second bearing cylinder, and the outer ring structure of the bottom bearing 272 is fixedly installed in the second bearing cylinder.

[0052] As an optional embodiment of this utility model, such as Figures 1 to 2 , Figure 4 As shown, the housing 100 includes a housing base 110 and a top cover 120. The motor assembly 200 and the reducer 300 are both disposed in the housing base 110. The top of the housing base 110 has a housing top opening. The top cover 120 is fixedly connected to the housing base 110 and closes the housing top opening. An output through hole is formed on the top cover 120. The output shaft of the reducer 300 passes through the output through hole to the outside of the housing 100.

[0053] The inner wall of the housing 110 has a positioning step surface a facing the top of the housing. The outer edge of the stator end cover 260 contacts the inner wall of the housing 110, and the bottom surface of the stator end cover 260 abuts against the positioning step surface a. The stator end cover 260 has a plurality of end cover mounting holes that extend axially. The rotary drive device also includes a plurality of mounting fasteners 520. The plurality of mounting fasteners 520 pass through the plurality of end cover mounting holes one by one and are fixedly connected to the housing 110.

[0054] In this embodiment of the utility model, the inner sidewall of the housing 110 has an upward positioning step surface a. The stator end cover 260 is installed into the housing 110 from above and is assembled and connected to the housing 110 by the installation fastener 520. Thus, the two chambers of the reducer 300 and the motor assembly 200 are separated by the cooperation between the bottom surface of the stator end cover 260 and the positioning step surface a.

[0055] As an optional embodiment of the present invention, the stator core 230 includes a connecting cylinder and multiple winding portions. The connecting cylinder surrounds the outside of the rotor shaft 210 and the magnetic component 220. The multiple winding portions are distributed circumferentially and connected to the outside of the connecting cylinder. Multiple stator windings 240 are respectively wound on the multiple winding portions.

[0056] As an optional embodiment of this utility model, such as Figure 1 , Figure 2 As shown, the stator core 230 also includes a plurality of winding mounting portions 231, which are connected to the outside of the plurality of winding portions. The winding mounting portions 231 have stator mounting through holes formed therein. A plurality of mounting fasteners 520 pass through the plurality of end cover mounting holes of the stator end cover 260 and the plurality of stator mounting through holes of the stator core 230 in sequence and are fixedly connected to the housing 110.

[0057] As an optional embodiment of this utility model, the stator core 230 includes a plurality of stator laminations stacked along the axial direction, and the connecting cylinder, winding part and winding mounting part 231 are all formed by stacking a plurality of stator laminations.

[0058] As an optional embodiment of this utility model, such as Figure 1 , Figure 2 As shown, the motor assembly 200 also includes a top stator support 251 and a bottom stator support 252. The top stator support 251 is disposed on the side of the stator core 230 facing the reducer 300 and covers the surface of the stator core 230 facing the reducer 300. The bottom stator support 252 is disposed on the side of the stator core 230 away from the reducer 300 and covers the surface of the stator core 230 away from the reducer 300. Multiple stator windings 240 are respectively wound on the winding portion of multiple stator laminations and on the top stator support 251 and the bottom stator support 252 on both sides.

[0059] Understandably, the top stator support 251 and the bottom stator support 252 are made of insulating material to separate the stator winding 240 from the stator core 230, in order to prevent short circuits between them.

[0060] Optionally, both the top stator bracket 251 and the bottom stator bracket 252 are made of plastic.

[0061] As an optional embodiment of this utility model, such as Figure 3As shown, the stator end cover 260 includes a cover plate 261 and a plurality of first positioning platforms 263. The plurality of first positioning platforms 263 are fixedly disposed on the side of the stator end cover 260 facing the winding mounting part 231. A plurality of end cover mounting holes penetrate the stator end cover 260 and the plurality of first positioning platforms 263. The bottom wall of the housing 110 has a plurality of second positioning platforms. The positions of the second positioning platforms correspond one-to-one with the positions of the plurality of first positioning platforms 263. The side of the second positioning platform facing the stator end cover 260 has a threaded hole. The mounting fastener 520 is a screw. The plurality of mounting fasteners 520 pass through the plurality of end cover mounting holes and the plurality of stator mounting through holes in sequence and are screwed into the threaded holes of the plurality of second positioning platforms.

[0062] As an optional embodiment of this utility model, such as Figure 1 , Figure 2 As shown, the bottom wall of the housing 100 also has an assembly through hole, which penetrates the bottom wall of the housing 100.

[0063] As a preferred embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 4 As shown, the reducer 300 is a planetary gear reducer, and the rotor shaft 210 is fixedly connected to the sun gear of the reducer 300.

[0064] In this embodiment of the invention, the reducer 300 is a planetary gear reducer. The rotor shaft 210 of the motor assembly 200 is inserted into the reducer 300 and fixedly connected to the sun gear of the reducer 300. As the rotor shaft 210 and the sun gear rotate, the planetary gears 340 rotate on their own axes and revolve around the ring gear 330 under the meshing action, thereby driving the planetary carrier 320 and the output shaft of the reducer 300 to rotate, thus achieving the transmission effect of reducing speed and increasing torque. Furthermore, the planetary gear reducer and the motor assembly 200 are both cylindrical structures with the output shaft located in the center, which can effectively reduce the overall size of the rotary drive device, thereby saving wiring space in the vehicle side door transmission area.

[0065] Preferably, such as Figure 1 , Figure 2 , Figure 4 As shown, the rotary drive device also includes a first limiting ball 510, which is rotatably disposed between the end face of the rotor shaft 210 and the portion of the reducer 300 opposite to the end face of the rotor shaft 210, so that there is a gap between the end face of the rotor shaft 210 and the portion of the reducer 300 opposite to the end face of the rotor shaft 210. The position of the first limiting ball 510 in the rotary drive device remains unchanged.

[0066] In this embodiment of the invention, a first limiting ball 510 is provided between the end face of the rotor shaft 210 and the components of the reducer 300. Thus, even if the rotor shaft 210 and the components of the reducer 300 are made axially adjacent in order to shorten the axial dimension of the rotary drive device, the first limiting ball 510 can be used to maintain an axial gap between the rotor shaft 210 and the components of the reducer 300, thereby reducing the friction between the rotor shaft 210 and the components of the reducer 300, and thus ensuring the transmission efficiency of the rotary drive device and the internal structural stability of the rotary drive device.

[0067] Optionally, such as Figure 1 , Figure 2 As shown, a first limiting groove is formed on the end face of the rotor shaft 210 facing the reducer 300, and a first limiting ball 510 is partially accommodated in the first limiting groove, and / or

[0068] A second limiting groove is formed on the surface of the central shaft 310 or planetary carrier 320 of the reducer 300 facing the rotor shaft 210, and the first limiting ball 510 is partially accommodated in the second limiting groove.

[0069] In this embodiment of the present invention, a first limiting ball 510 is provided between the rotor shaft 210 of the motor assembly 200 and the components of the reducer 300, and at least one of the rotor shaft 210 and the components of the reducer 300 is grooved at the position corresponding to the first limiting ball 510. The positional stability of the first limiting ball 510 is maintained by the first limiting groove at the top of the rotor shaft 210 and / or the second limiting groove at the bottom of the reducer 300.

[0070] As an optional embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 4 As shown, the sun gear of the reducer 300 is integrated with the rotor shaft 210, that is, the rotor shaft 210 is a splined shaft, which meshes with multiple planetary gears 340 through the spline at the top of the rotor shaft 210.

[0071] Optionally, such as Figure 1 , Figure 2 As shown, the top cover 120 has a top bearing groove on the side facing the motor assembly 200, and the output through hole extends from the bottom of the top bearing groove to the outer surface of the top cover 120; the rotary drive device also includes an output bearing 410, the outer ring structure of the output bearing 410 is disposed in the top bearing groove, and the inner ring structure of the output bearing 410 is sleeved on the output shaft of the reducer 300.

[0072] Optionally, such as Figure 4As shown, the inner wall of the housing 110 has a plurality of positioning grooves 111. The gear ring 330 of the reducer 300 includes a gear ring body 331 and a plurality of positioning protrusions 332. The plurality of positioning protrusions 332 are distributed on the outer side of the gear ring body 331, and the plurality of positioning protrusions 332 are respectively accommodated in the plurality of positioning grooves 111.

[0073] Optionally, such as Figure 1 , Figure 2 , Figure 4 As shown, the reducer 300 includes at least one planetary assembly, which includes a central shaft 310, a planet carrier 320, a ring gear 330, and multiple planetary gears 340. The central shaft 310 is fixedly disposed on the side of the planet carrier 320 away from the motor assembly 200. The multiple planetary gears 340 are movably disposed on the planet carrier 320 and distributed around the axis of the central shaft 310. The ring gear 330 is sleeved on the outside of the multiple planetary gears 340 and meshes with the multiple planetary gears 340. The ring gear 330 is fixedly disposed in the housing 100. The rotor shaft 210 is fixedly connected to the sun gear closest to the rotor shaft 210 in the reducer 300. The first limiting ball 510 is disposed between the rotor shaft 210 and the planet carrier 320 closest to the rotor shaft 210 in the reducer 300.

[0074] Understandably, when the reducer 300 includes multiple planetary assemblies, the central shaft 310 of the outermost planetary assembly extends out of the housing 100 and forms the output shaft of the reducer 300. The first limiting ball 510 is disposed between the rotor shaft 210 and the planet carrier 320 closest to the rotor shaft 210. Correspondingly, the second limiting groove is formed at the bottom of the planet carrier 320 closest to the rotor shaft 210.

[0075] To ensure the coaxiality between the top cover 120 and the housing 110, and thus the coaxiality between the output shaft and the rotor shaft 210 of the reducer 300, preferably, as follows: Figure 1 , Figure 2 As shown, the bottom of the top cover 120 has an annular positioning boss 121, which extends around the output through hole. The annular positioning boss 121 is accommodated inside the housing 110 and abuts against the top surface of the gear ring 330.

[0076] To improve the overall axial structural compactness of the rotary drive device, preferably, as follows: Figure 4 As shown, at least one planetary carrier 320 has a bearing clearance groove 323 on the side opposite to the motor assembly 200, and the output bearing 410 is partially accommodated in the corresponding bearing clearance groove 323.

[0077] Optionally, the output bearing 410 is a deep groove ball bearing.

[0078] To further improve the overall axial structural compactness of the rotary drive device, preferably, such as Figure 1 , Figure 2 , Figure 4 As shown, the planetary assembly also includes multiple gear shafts 350. Each gear shaft 350 includes an assembly section 351, a mating section 352, and a limiting section 353 that are connected sequentially along its length and whose diameters increase sequentially. The planet carrier 320 has multiple gear mounting holes 321, and the planetary gear 340 has gear limiting holes and gear mating holes that are connected sequentially along its axial direction. The gear shaft 350 passes through the gear limiting holes and gear mating holes sequentially and is fixed in the gear mounting holes 321. The assembly section 351 is accommodated in the gear mating hole, and the limiting section 353 is accommodated in the gear limiting hole.

[0079] In this embodiment of the utility model, the shaft hole of the planetary gear 340 adopts a countersunk design, and the assembly section 351 and the limiting section 353 of the gear shaft 350 are both hidden inside the planetary gear 340, thereby further shortening the overall axial dimension of the reducer 300 and improving the overall axial structural compactness of the rotary drive device.

[0080] To reduce the overall weight of the rotary drive device, preferably, such as Figure 4 As shown, a plurality of first weight reduction holes 322 are formed in the planetary carrier 320. The plurality of first weight reduction holes 322 are disposed between adjacent gear mounting holes 321. The first weight reduction holes 322 penetrate the planetary carrier 320 along the axial direction of the central shaft 310 and extend circumferentially around the central shaft 310, thereby reducing the weight of the planetary carrier 320 components and thus reducing the overall weight of the rotary drive device, which is beneficial to achieving lightweighting of the vehicle side door structure.

[0081] To further reduce the overall weight of the rotary drive device, preferably, such as Figure 4 As shown, a plurality of second weight-reducing holes 341 are formed in the planetary gear 340. The second weight-reducing holes 341 penetrate the planetary gear 340 along the axial direction of the gear shaft 350. The plurality of second weight-reducing holes 341 are distributed circumferentially around the gear shaft 350 and extend circumferentially.

[0082] In some embodiments of this invention, the central shaft 310 can be inserted into the central hole of the planetary carrier 320, in which case the central shaft 310 and the rotor shaft 210 abut against each other via the first limiting ball 510. Correspondingly, a second limiting groove can be formed on the side of the central shaft 310 facing the rotor shaft 210.

[0083] Preferably, such as Figure 1 , Figure 2 , Figure 4 As shown, the central shaft 310 and the planetary carrier 320 are formed into one piece by powder metallurgy.

[0084] In this embodiment of the utility model, the central shaft 310 and the planetary carrier 320 are formed into one piece by powder metallurgy. Compared with the scheme of assembling or welding the central shaft 310 and the planetary carrier 320, this can effectively improve the coaxiality between the central shaft 310 and the rotor shaft 210, and improve the stability of the internal structure of the reducer 300, thereby ensuring the stability and smoothness of the operation of the rotary drive device.

[0085] Optionally, the first limiting ball 510 is made of steel.

[0086] As a second aspect of this utility model, a side door drive assembly is provided, including an actuator and a rotary drive device provided in the embodiments of this utility model. The rotary drive device is fixedly connected to one of the side door and the passenger compartment of a car, and the actuator is connected to the other of the side door and the passenger compartment. The actuator is connected to the output shaft of the reducer 300 in the rotary drive device and is capable of converting the rotational movement of the output shaft of the reducer 300 into the sliding movement of the side door relative to the passenger compartment.

[0087] As an optional embodiment of this utility model, the actuator can be a wire pull mechanism. Specifically, the actuator may include a wire pull, a first wire and a second wire. The wire pull is connected to the output shaft of the reducer 300. The rotary drive device is disposed on one of the side door and the carriage. The first end of the first wire and the first end of the second wire are both wound on the wire pull, and the winding directions of the first wire and the second wire on the wire pull are opposite. The second end of the first wire and the second end of the second wire are both fixedly disposed on the other of the side door and the carriage, and the second end of the first wire and the second end of the second wire are respectively located on both sides of the wire pull.

[0088] Taking a rotary drive device installed on the carriage, with the second end of the first cable and the second end of the second cable connected to the side door as an example, when it is necessary to control the door to move to one side, the rotary drive device can be controlled to drive the pulley to rotate in a certain direction, so that the pulley tightens the first cable and releases the second cable, and the second end of the first cable pulls the door to that side; when it is necessary to control the door to move to the other side, the rotary drive device can be controlled to drive the pulley to rotate in the other direction, so that the pulley tightens the second cable and releases the first cable, and the second end of the second cable pulls the door to the other side in the opposite direction.

[0089] As an optional embodiment of this utility model, the actuator can also be a transmission pair in the form of a pulley. Specifically, the actuator includes a driving wheel, a driven wheel, a flexible traction belt, and a connecting seat. The driving wheel is connected to the output shaft of the reducer 300. The rotary drive device and the driven wheel are disposed on one of the side door and the carriage. The flexible traction belt is wound around the driving wheel and the driven wheel. The connecting seat is fixedly disposed on the flexible traction belt and connected to the other of the side door and the carriage. The rotary drive device can drive the driving wheel to rotate and drive the flexible traction belt and the connecting seat disposed on it to move together, thereby driving the side door and the carriage to slide relative to each other.

[0090] Alternatively, the flexible tension belt can be a belt, wire harness, or chain.

[0091] As an optional embodiment of this utility model, the actuator can also be a gear and rack transmission pair. Specifically, the actuator includes a guide rack and a mating gear. The mating gear meshes with the guide rack and is connected to the output shaft of the reducer 300. The guide rack is used to connect with one of the side door and the carriage, and the rotary drive device is used to connect with the other of the side door and the carriage.

[0092] As a third aspect of this utility model, a car body is provided, such as... Figure 5 , Figure 6 As shown, the vehicle body includes a passenger compartment 10 and at least one side door 20. The side door 20 is disposed on the side of the passenger compartment 10 and is movably connected to the passenger compartment 10. The vehicle body also includes a side door drive assembly 30 provided in this embodiment of the present invention, which is connected between the side door 20 and the passenger compartment 10.

[0093] Optionally, such as Figure 5 , Figure 6 As shown, the side of the carriage 10 is provided with a top guide rail 12, a middle guide rail 13 and a bottom guide rail 14. The top guide rail 12, the middle guide rail 13 and the bottom guide rail 14 all extend in the horizontal direction and are located at the top, side and bottom of the entrance and exit 11 on the side of the carriage 10, respectively. The side door 20 is movably disposed on the top guide rail 12, the middle guide rail 13 and the bottom guide rail 14 and can slide horizontally along the guide direction of the guide rail to selectively open or close the entrance and exit 11.

[0094] As an optional embodiment of this utility model, such as Figure 5 As shown, the position of the side door drive assembly 30 corresponds to the position of the middle guide rail 13, that is, its height is between the top guide rail 12 and the bottom guide rail 14, and it is located on the same side of the entrance and exit 11 as the middle guide rail 13.

[0095] As another optional embodiment of this utility model, such as Figure 6 As shown, the position of the side door drive assembly 30 corresponds to the bottom guide rail 14, that is, its height is below the entrance / exit 11.

[0096] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A rotary drive device comprising a housing (100), a motor assembly (200) and a speed reducer (300), the motor assembly (200) and the speed reducer (300) are each provided in the housing (100), characterized in that, The motor assembly (200) includes a rotor shaft (210), a magnetic element (220), a stator core (230), a stator end cover (260), and a plurality of stator windings (240). The magnetic element (220) is sleeved on the rotor shaft (210) and has a plurality of magnetic poles distributed circumferentially. The stator core (230) surrounds the magnetic element (220) and is fixedly disposed in the housing (100). The plurality of stator windings (240) The stator end cap (260) is fixedly disposed between the stator core (230) and the reducer (300), and the outer edge of the stator end cap (260) is connected to the inner wall of the housing (100). A shaft clearance hole is formed in the stator end cap (260), and one end of the rotor shaft (210) passes through the shaft clearance hole and is connected to the reducer (300).

2. The rotary drive device according to claim 1, characterized in that The motor assembly (200) further includes a top bearing (271) and a bottom bearing (272). The inner ring structure of the top bearing (271) and the inner ring structure of the bottom bearing (272) are both sleeved on the rotor shaft (210). The top bearing (271) and the bottom bearing (272) are respectively located on both sides of the magnetic component (220) along the axial direction of the rotor shaft (210). The outer ring structure of the top bearing (271) is fixedly connected to the stator end cover (260), and the outer ring structure of the bottom bearing (272) is fixedly connected to the housing (100).

3. The rotary drive device according to claim 2, characterized in that The stator end cover (260) includes a cover plate (261) and a first bearing sleeve (262). The cover plate (261) is fixedly disposed between the stator core (230) and the reducer (300), and the shaft clearance hole is formed on the cover plate (261). The first bearing sleeve (262) is fixedly disposed on the side of the cover plate (261) away from the reducer (300), and the first bearing sleeve (262) surrounds the shaft clearance hole. The outer ring structure of the top bearing (271) is fixedly disposed in the first bearing sleeve (262).

4. The rotary drive device according to claim 3, characterized in that The inner wall of the housing (100) away from the reducer (300) has a second bearing cylinder, and the outer ring structure of the bottom bearing (272) is fixedly disposed in the second bearing cylinder.

5. The rotary drive device according to any one of claims 1 to 4, characterized in that, The housing (100) includes a housing base (110) and a top cover (120). The motor assembly (200) and the reducer (300) are both disposed in the housing base (110). The top of the housing base (110) has a top opening. The top cover (120) is fixedly connected to the housing base (110) and closes the top opening. An output through hole is formed on the top cover (120). The output shaft of the reducer (300) passes through the output through hole to the outside of the housing (100). The inner wall of the housing (110) has a positioning step surface (a) facing the opening of the top of the housing. The outer edge of the stator end cover (260) contacts the inner wall of the housing (110), and the bottom surface of the stator end cover (260) abuts against the positioning step surface (a). The stator end cover (260) has a plurality of end cover mounting holes that pass through the axial direction. The rotary drive device also includes a plurality of mounting fasteners (520). The plurality of mounting fasteners (520) pass through the plurality of end cover mounting holes one by one and are fixedly connected to the housing (110).

6. The rotary drive device according to claim 5, characterized in that The stator core (230) includes a connecting cylinder, multiple winding sections and multiple winding mounting sections (231). The connecting cylinder surrounds the outside of the rotor shaft (210) and the magnetic component (220). The multiple winding sections are distributed circumferentially and connected to the outside of the connecting cylinder. The multiple stator windings (240) are respectively wound on the multiple winding sections. Multiple winding mounting portions (231) are connected to the outside of multiple winding portions. A stator mounting through hole is formed in the winding mounting portion (231). Multiple mounting fasteners (520) pass through multiple end cover mounting holes of the stator end cover (260) and multiple stator mounting through holes of the stator core (230) in sequence and are fixedly connected to the housing (110).

7. The rotary drive device according to claim 6, characterized in that The stator end cover (260) includes a cover plate (261) and a plurality of first positioning platforms (263). The plurality of first positioning platforms (263) are fixedly disposed on the side of the stator end cover (260) facing the winding mounting part (231). The plurality of end cover mounting holes penetrate the stator end cover (260) and the plurality of first positioning platforms (263). The bottom wall of the housing (110) has a plurality of second positioning platforms. The positions of the second positioning platforms correspond one-to-one with the positions of the plurality of first positioning platforms (263). The side of the second positioning platform facing the stator end cover (260) has a threaded hole. The mounting fastener (520) is a screw. The plurality of mounting fasteners (520) pass through the plurality of end cover mounting holes and the plurality of stator mounting through holes in sequence and are screwed into the threaded holes of the plurality of second positioning platforms.

8. The rotary drive device according to any one of claims 1 to 4, characterized in that The reducer (300) is a planetary gear reducer, and the rotor shaft (210) is fixedly connected to the sun gear of the reducer (300).

9. A side door drive assembly characterized by, The device includes an actuator and a rotary drive device as described in any one of claims 1 to 8, the rotary drive device being fixedly connected to one of a side door and a passenger compartment of an automobile, the actuator being connected to the other of the side door and the passenger compartment, the actuator being connected to the output shaft of a reducer (300) in the rotary drive device, and being capable of converting the rotational motion of the output shaft of the reducer (300) into a sliding motion of the side door relative to the passenger compartment.

10. A motor vehicle body comprising a vehicle cabin and at least one side door, the side door being provided on a side of the vehicle cabin and being movably connected to the vehicle cabin, characterized in that The vehicle body also includes the side door drive assembly as described in claim 9, the side door drive assembly being connected between the side door and the passenger compartment.

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