Driving device and wheel using same

Abstract

The invention provides a driving device and a wheel using the same. The driving device comprises a motor and a gear reduction mechanism. The motor comprises a motor shell, a stator and a rotor. A rotating shaft of the rotor extends out of the first end of the motor shell. The gear speed reduction mechanism comprises a support, a first-stage speed reduction structure, a last-stage speed reduction structure and a driving part. The bracket is fixed to the axial outer side of the first end of the motor. The first-stage speed reduction structure receives output of the motor. The last-stage speed reduction structure comprises a pinion and an inner gear ring, the pinion receives the output of the first-stage speed reduction mechanism and is rotatably connected to the support, and the inner gear ring surrounds the pinion and is meshed with the pinion; the driving part surrounds the inner gear ring and is fixed to the inner gear ring, the first end of the driving part is arranged on the outer side of the motor shell in a sleeving mode and rotatably supported on the motor shell, and the second end of the driving part is rotatably supported on a supporting shaft arranged on the support. The axial size of the driving device is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to a driving device and a wheel using the same, and more particularly to a driving device suitable for driving or towing a wheel. BACKGROUND

[0002] A wheel comprises a hub, a tire sleeved to the hub, and a driving device mounted to the hub. The driving device comprises a motor and a gear reduction mechanism. The motor and the gear reduction mechanism are arranged in the axial direction of the motor. The gear reduction mechanism reduces the output of the motor and drives the hub, thereby driving the wheel. One disadvantage of this scheme is that the axial gear of the driving device is long and the overall size of the wheel is large. Therefore, an improved scheme is needed. SUMMARY

[0003] One object of the present application is to improve the axial size of the driving device.

[0004] To this end, the present application provides a driving device comprising a motor and a gear reduction mechanism, wherein: the motor comprises a motor housing, a stator and a rotor arranged in the motor housing; the rotor shaft of the rotor extends from a first end of the motor housing; the gear reduction mechanism comprises a support fixed to the outside of the first end of the motor, a primary reduction structure, a final reduction structure and a driving member; the primary reduction structure comprises a sun gear fixedly sleeved to the rotor shaft, and a large gear meshing with the sun gear; the final reduction structure comprises a pinion and an inner ring gear, the pinion is rotatably connected to the support and receives the output of the primary reduction structure, and the inner ring gear surrounds the pinion and meshes with the pinion; the driving member surrounds the inner ring gear and is fixed with the inner ring gear, the first end of the driving member is sleeved to the outside of the motor housing and is rotatably supported on the motor housing, and the second end of the driving member is rotatably supported on a support shaft arranged on the support.

[0005] In one embodiment of the present application, the large gear and the pinion of the double gear are coaxially fixed, forming a double gear; the large gear and the pinion of the double gear are supported by the same center shaft and connected to the support.

[0006] In one embodiment of the present application, the number of double gears is two or more, and they are arranged uniformly around the sun gear.

[0007] In one embodiment of the present application, the end of the support away from the motor is provided with a connecting plate, the first end of the motor housing is a first end cover plate, and the two ends of the center shaft are connected to the connecting plate and the first end cover plate, respectively.

[0008] In one embodiment of the present invention, the bracket further includes a plurality of support portions extending from the edge of the connecting plate toward the motor, and a connecting portion located at the end of the support portion, the connecting portion being fixedly connected to the first end cover plate; the double gear is received between the first end cover plate and the connecting plate.

[0009] In one embodiment of the present invention, the motor is a brushless motor, the motor housing includes an annular shell portion, and a first end cover plate and a second end cover plate are respectively provided at both ends of the annular shell portion. The stator and rotor are housed between the first end cover plate and the second end cover plate, and the two ends of the rotor shaft are rotatably supported on the first end cover plate and the second end cover plate, respectively.

[0010] In one embodiment of the present invention, the driving member is a cylindrical shape with one open end, including an annular wall and a base plate located at one end of the annular wall; the open end of the annular wall is sleeved onto the outside of the motor housing and sealed by a first sealing member; the base plate is rotatably supported on the support shaft, and a second sealing member is provided between the base plate and the support shaft.

[0011] In one embodiment of the present invention, the support shaft extends outward from the center of the bracket along the motor axis; the motor housing and the support shaft support the drive component through a first rolling bearing and a second rolling bearing, respectively.

[0012] In one embodiment of the invention, the invention further includes a controller and a controller housing that houses the controller, the controller housing being fixed to the end of the motor housing away from the gear reduction mechanism.

[0013] In one embodiment of the present invention, an electromagnetic braking module is further included, which is installed inside the housing of the controller.

[0014] In a second aspect, the present invention provides a wheel comprising a hub and a tire, the hub comprising an annular rim and spokes connecting the rim, the tire being mounted to the outer side of the rim; the wheel further comprising a drive device as described above, the drive device being disposed in the space enclosed by the rim and the spokes, the drive element of the drive device being fixedly connected to at least one of the rim and the spokes.

[0015] The drive device of the present invention includes a motor and a gear reduction mechanism. The gear reduction mechanism is directly connected to the motor housing, and one end of the drive component of the final stage reduction structure of the gear reduction mechanism is sleeved on the outside of the motor housing and rotatably supported on the motor housing. This structure shortens the axial dimension of the drive device. Attached Figure Description

[0016] To further reveal the specific technical content of this case, please first refer to the accompanying drawings, in which: Figure 1This is a schematic diagram of a driving device provided in one embodiment of the present invention; Figure 2 yes Figure 1 A longitudinal sectional view of the drive device shown; Figure 3 yes Figure 1 An exploded schematic diagram of the drive device shown. Figure 4 yes Figure 3 An exploded view of the gear reduction mechanism used in the drive device shown. Figure 5 yes Figure 3 The diagram shows a motor equipped with a sun gear and a double gear for the drive unit shown. Figure 6 yes Figure 1 A schematic diagram of the drive unit after the drive component has been removed. Figure 7 This is a schematic diagram of a wheel provided in one embodiment of the present invention; Figure 8 yes Figure 7 The diagram shown is a schematic of the wheel after the drive unit has been removed. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will now be described with reference to the accompanying drawings.

[0018] Please refer to Figure 1 An embodiment of the present invention provides a drive device 100 including a motor 20 and a gear reduction mechanism 70. The motor 20 and the gear reduction mechanism 70 are arranged adjacent to each other along the motor axial direction, and the gear reduction mechanism 70 is connected to the motor housing 21. The motor housing 21 is provided with a plurality of mounting holes 23 for connection to the outside. The housing of the gear reduction mechanism 70 serves as a drive member 71, which can be driven by the motor 20 to rotate, thereby driving an external object. The drive member 71 may be provided with a plurality of connection holes 73 for connecting the driven object. For example, when the drive device 100 serves as a drive device for a traction wheel, the drive device 100 can be fixed to the frame through the mounting holes 23, and connected to the wheel hub through the connection holes 73, thereby driving the wheel hub. The first end of the drive member 71 is sleeved on the motor housing 21 and rotatably supported on the motor housing 21, and the second end is rotatably supported on a support shaft 88 fixed relative to the motor housing 21. In this embodiment, the gear reduction mechanism 70 is directly connected to the motor housing 21, and one end of the drive member 71 of the final stage reduction structure of the gear reduction mechanism 70 is sleeved on the outside of the motor housing 21 and rotatably supported on the motor housing 21. This structure shortens the axial dimension of the drive device 100 and improves the stability of the drive member 71.

[0019] Please refer to Figure 2 and Figure 3The first end of the motor housing 21 is a first end cover plate 27, and the second end is a second end cover plate 29, respectively. The stator and rotor of the motor are mainly disposed within the space formed by the first end cover plate 27 and the second end cover plate 29. The rotor shaft 51 extends from the first end cover plate 27 and is connected to the gear reduction mechanism 70.

[0020] In this embodiment, the motor 20 is a brushless motor, and an annular shell portion 25 is provided on the inner side of the motor housing 21. The two ends of the annular shell portion 25 are respectively connected to a first end cover plate 27 and a second end cover plate 29. The stator includes a stator core 41 fixed to the inner wall of the annular shell portion 25 and a stator winding 43 wound around the stator core. The rotor includes a rotor core 53 fixedly sleeved onto the rotating shaft 51 and a permanent magnet fixed to the rotor core 53. The rotor core 53 is surrounded by the stator core 41. The two ends of the rotating shaft 51 are rotatably supported on the first end cover plate 27 and the second end cover plate 29, respectively. Preferably, the first end cover plate 27 and the second end cover plate 29 are respectively equipped with a first motor bearing 32 and a second motor bearing 34 to reduce the rotational resistance of the rotating shaft 51. In this embodiment, the outer diameter of the gear reduction mechanism 70 (i.e., the outer diameter of the driving component 71) is larger than the outer diameter of the annular shell portion 25. Therefore, the motor housing 21 also includes an outer ring wall adapted to the drive component 71, and this outer ring wall is connected to the annular shell portion 25 by several reinforcing plates 26. This design increases the outer diameter of the drive component 71, improving its stability and load-bearing capacity. Preferably, the motor housing 21 and the support shaft 88 support the drive component 71 through a first rolling bearing 36 and a second rolling bearing 38, respectively.

[0021] Please refer to Figure 2 to Figure 6The gear reduction mechanism 70 includes a bracket 81, a first-stage reduction structure, a final-stage reduction structure, and a drive member 71. The bracket 81 is located axially outside the first end cover plate 27 and includes a connecting plate 83, several support portions 84 extending from the edge of the connecting plate 83 toward the motor, and a connecting portion 85 located at the end of the support portions 84. The connecting portion 85 bends with the support portions 84, extends radially outward relative to the support portions 84, and is fixedly connected to the first end cover plate 27 by several connectors 81b. Correspondingly, the first end cover plate 27 is provided with corresponding connecting holes 27b. Preferably, the connecting portion 85 may also be provided with a protruding positioning portion 81c, and the first end cover plate 27 is provided with a corresponding positioning hole 27c to facilitate the assembly of the bracket 81. The first-stage reduction structure receives the output of the motor 20 and includes a sun gear 75 fixedly sleeved onto the rotating shaft 51 and a large gear 76 meshing with the sun gear 75. The final stage reduction structure includes a pinion 78 and an internal gear ring 79. The pinion 78 is mounted to the connecting plate 83 via a central shaft 77. The pinion 78 rotates upon receiving the output from the previous stage reduction mechanism. The internal gear ring 79 surrounds and meshes with the pinion 78. A drive member 71 surrounds and is fixed to the internal gear ring 79. The first end of the drive member 71 is sleeved on the outside of the motor housing 21 and rotatably supported on the motor housing 21. The second end of the drive member 71 is rotatably supported on a support shaft 88 disposed on the connecting plate 83. In this embodiment, the support shaft 88 is fixed to the connecting plate 83 and extends outward from the center of the connecting plate 83 along the motor axial direction. The motor housing 21 and the support shaft 88 support the two ends of the drive member 71 via a first rolling bearing 36 and a second rolling bearing 38, respectively.

[0022] In this embodiment, the gear reduction mechanism 70 is a two-stage reduction mechanism. A large gear 76 and a corresponding small gear 78 are coaxially fixed to form a double gear. Each double gear's large gear 76 and small gear 78 are supported by the same central shaft 77. The two ends of the central shaft 77 are connected to a connecting plate 83 and a first end cover plate 27, respectively. The first end cover plate 27 and the connecting plate 83 are respectively provided with receiving holes 27a and 83a, used to connect the two ends of the central shaft 77. The double gear is housed between the first end cover plate 27 and the connecting plate 83.

[0023] In this embodiment, there are two double gears, evenly spaced around the sun gear 75. However, the invention is not limited to a two-gear configuration; understandably, this embodiment may use more or fewer double gears.

[0024] In this embodiment, the drive component 71 is a cylindrical shape with one open end, including an annular wall 72 and a base plate 74 located at one end of the annular wall 72. The open end of the annular wall 72 is fitted onto the outside of the motor housing 21 and sealed by a first seal 37. The base plate 74 is rotatably supported on a support shaft 88, and a second seal 39 is sealed between the base plate 74 and the support shaft 88 on the outside of the second rolling bearing 38. This prevents external liquids or particles from entering the gear reduction mechanism 70, improving product reliability and service life. Preferably, the second end cover plate 29 of the motor 20 is also sealed to the motor shaft 51, thereby preventing external liquids or particles from entering the gear reduction mechanism 70 and the motor 20, improving product reliability and service life.

[0025] Preferably, a limiting structure is provided on the motor housing 21 and / or the support shaft 88 to prevent the drive component 71 from falling off. For example, the limiting structure may be a C-ring, fitted into the limiting groove of the support shaft 88 and located outside the second rolling bearing 38 or the base plate 74 of the drive component 71.

[0026] In this embodiment, the drive device 100 further includes a controller 90 and a controller housing 91 that houses the controller 90. The controller housing 91 is fixed to the end of the motor housing 21 away from the gear reduction mechanism 70. The drive device 100 may also include an electromagnetic braking module 60. The electromagnetic braking module 60 may be selectively installed inside the controller housing 91 as needed.

[0027] Please refer to Figure 7 and Figure 8 In another embodiment of the present invention, a wheel 200 incorporating a drive unit 100 is provided. The wheel 200 includes a hub 110, a tire 120, and a drive unit 100. The hub 110 includes an annular rim 112 and spokes 114 connecting the rim. The tire 120 is mounted to the outer side of the rim 112. Preferably, the spokes 114 are offset from the center of the rim 112, creating a larger receiving space on the inner side of the rim 112 and on one side of the spokes 114. The drive unit 100 is disposed within the receiving space formed by the rim 112 and the spokes. The drive member 71 of the drive unit 100 is fixedly connected to at least one of the rim 112 and the spokes 114. For example, the drive unit 100 can be fixed to the frame via mounting holes 23 in the motor housing 21 and connected to the spokes 114 via connection holes 73 in the drive member 71, thereby enabling the drive unit 100 to drive the hub 110.

[0028] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A driving device comprising a motor and a gear reduction mechanism, characterized in that: the motor comprises a motor housing, a stator and a rotor arranged in the motor housing, and a rotating shaft of the rotor extends from a first end of the motor housing; the gear reduction mechanism comprises a support fixed to an outer side of the first end of the motor, a primary reduction structure, a final reduction structure and a driving member; the primary reduction structure comprises a sun gear sleeved on the rotating shaft and a large gear engaged with the sun gear; the final reduction structure comprises a pinion and an inner ring gear, the pinion is rotatably connected to the support and receives an output of the primary reduction structure, and the inner ring gear surrounds the pinion and is engaged with the pinion; the driving member surrounds the inner ring gear and is fixed to the inner ring gear, a first end of the driving member is sleeved on an outer side of the motor housing and is rotatably supported on the motor housing, and a second end of the driving member is rotatably supported on a support shaft arranged on the support. The large gear and the pinion are coaxially fixed to form a double gear, and the large gear and the pinion of the double gear are supported by a same central shaft and connected to the support. The number of the double gears is two or more, and the double gears are arranged uniformly around the sun gear.

2. The drive apparatus according to claim 1, characterized by An end of the support away from the motor is provided with a connecting plate, the first end of the motor housing is a first end cover plate, and two ends of the central shaft are connected to the connecting plate and the first end cover plate respectively.

3. The drive apparatus according to claim 2, characterized by The support further comprises a plurality of support portions extending from edges of the connecting plate towards the motor and a connecting portion at the end of the support portion, the connecting portion is fixedly connected to the first end cover plate, and the double gears are accommodated between the first end cover plate and the connecting plate.

4. The drive apparatus according to claim 2, characterized by The motor is a brushless motor, the motor housing comprises a ring-shaped shell portion, two ends of the ring-shaped shell portion are provided with the first end cover plate and a second end cover plate respectively, the stator and the rotor are accommodated between the first end cover plate and the second end cover plate, and two ends of the rotating shaft of the rotor are rotatably supported on the first end cover plate and the second end cover plate respectively.

5. The drive apparatus according to claim 4, characterized by The driving member is a cylinder with an open end, comprising a ring wall and a bottom plate at one end of the ring wall, the open end of the ring wall is sleeved on an outer side of the motor housing and is sealingly connected by a first sealing member, and the bottom plate is rotatably supported on the support shaft and is provided with a second sealing member between the bottom plate and the support shaft.

6. The drive apparatus according to claim 4, characterized by The support shaft extends outward from the center of the support along the axial direction of the motor, and the motor housing and the support shaft support the driving member by first and second rolling bearings respectively.

7. The drive apparatus according to claim 1, characterized by Further comprising a controller and a controller housing accommodating the controller, the controller housing is fixed to an end of the motor housing away from the gear reduction mechanism.

8. The drive apparatus according to claim 1, characterized by Further comprising an electromagnetic brake module arranged in the controller housing.

9. The drive apparatus according to claim 1, characterized by The wheel further comprises the driving device according to any one of claims 1 to 10, the driving device is arranged in a space surrounded by the rim and the spoke, and the driving member of the driving device is fixedly connected to at least one of the rim and the spoke.

10. The drive apparatus according to claim 9, characterized by ​ 11. A wheel comprising a wheel hub and a tire, the wheel hub comprising a ring-shaped rim and spokes connecting the rim, the tire being mounted to an outer side of the rim; characterized in that, ​

Images