Hub motor with inner and outer cycloid structures

Abstract

The utility model provides a hub motor with inner and outer cycloid structures, and relates to the technical field of hub motors. The speed reducer comprises a hub shell, a center shaft, a motor assembly and an inner and outer cycloid speed reducing assembly, a mounting hole is formed in the hub shell along a rotating shaft of the hub shell, and the center shaft is inserted into the mounting hole and connected with the motor assembly; the inner and outer cycloid speed reduction assembly comprises a cycloid gear, an inner gear and an outer gear, the cycloid gear is of an annular structure and is provided with outer teeth and inner teeth, the inner gear is arranged on the cycloid gear in a sleeving mode and forms an outer cycloid gear set with the outer teeth, and the cycloid gear is arranged on the outer gear in a sleeving mode and forms an inner cycloid gear set with the outer gear through the inner teeth. The outer gear is in transmission connection with the hub shell, and an output shaft of the motor assembly is in transmission connection with the cycloid gear and can drive the cycloid gear to do planetary rotation around the center shaft so as to drive the outer gear to rotate in the same direction through the cycloid gear. The device has the effect that workers can replace parts conveniently.

Description

Technical Field

[0001] The present application relates to the technical field of wheel hub motors, and in particular to a wheel hub motor with an inner and outer cycloid structure. Background Art

[0002] A wheel hub motor is a motor that is installed inside a wheel hub and can drive a wheel connected to the wheel hub to rotate. Existing wheel hub motors generally use a cycloid pinwheel reduction mechanism to achieve a reduced speed output in a small space.

[0003] The hub motor using a cycloidal pinwheel reduction mechanism generally includes a hub shell, a center shaft, a motor assembly and a cycloidal pinwheel reduction assembly. The two ends of the center shaft are used to connect to the frame, the hub shell is sleeved on the middle of the center shaft, the motor assembly includes a stator and a rotor arranged in the hub shell, the reduction and torque-increasing assembly includes an eccentric sleeve sleeved on the center shaft, an outer gear sleeved on the eccentric sleeve, an inner gear sleeved on the outer gear and an output disk, the rotor is connected to the eccentric sleeve, the inner gear is fixedly connected to the stator, the output ring is connected to the hub shell, and a transmission shaft is provided on the annular surface of the output ring, the transmission shaft is inserted into the transmission hole opened on the outer gear, so that the outer gear can be driven to rotate around the center shaft to make planetary rotation through the eccentric sleeve and the power is transmitted to the output disk and the hub shell via the transmission shaft.

[0004] In order to prevent the eccentric sleeve from generating eccentric force during rotation, a pair of eccentric circle segments with equal eccentric distances and a phase difference of 180° are provided on the eccentric sleeve, and an external gear is sleeved on each eccentric circle segment, and both external gears are meshed with the internal gear.

[0005] However, since there are two eccentric circle segments with a phase difference of 180° on the eccentric sleeve, the two external gears cannot be removed from the same end of the eccentric sleeve, so workers must first remove the entire speed reduction and torque increase assembly from the center shaft before replacing the two external gears, making it more difficult to replace the parts of this type of hub motor.

[0006] In view of this, it is necessary to provide a hub motor with an inner and outer cycloid structure. Utility Model Content

[0007] In order to solve the problem that parts replacement of existing hub motors using cycloid pinwheel reduction mechanisms is difficult, the present application provides a hub motor with an inner and outer cycloid structure.

[0008] The present application provides a hub motor with an inner and outer cycloid structure, which adopts the following technical solution: comprising a hub shell, a central shaft, a motor assembly and an inner and outer cycloid reduction assembly, wherein a mounting hole is provided on the hub shell along its rotation axis, and the central shaft is inserted into the mounting hole and connected to the motor assembly;

[0009] The inner and outer cycloid reduction assembly includes a cycloid gear, an inner gear and an outer gear. The cycloid gear is annular and is provided with outer teeth and inner teeth. The inner gear is sleeved on the cycloid gear and forms an outer cycloid gear set with the outer teeth. The cycloid gear is sleeved on the outer gear and forms an inner cycloid gear set with the outer gear via the inner teeth. The outer gear is transmission-connected to the hub housing. The output shaft of the motor assembly is transmission-connected to the cycloid gear and can drive the cycloid gear to perform planetary rotation around the center axis, so as to drive the outer gear to rotate in the same direction via the cycloid gear.

[0010] By adopting the above technical solution, the motor assembly can input power to the cycloid gear, so as to drive the cycloid gear to perform planetary rotation around the central axis through the cooperation between the outer teeth of the cycloid gear and the inner gear. At the same time, the inner teeth of the cycloid gear will cooperate with the outer gear to drive the outer gear to drive the hub shell to rotate in the same direction. Since the inner and outer cycloid reduction assembly adopts the principle of planetary transmission with small tooth difference, not only the overall space occupied is small, but also a large speed ratio can be achieved between its own power input end and power output end, so that the hub motor with inner and outer cycloid structure has the advantages of small size, light weight and low energy consumption; and the design of the inner and outer cycloid reduction assembly also makes it possible for the internal gear, the cycloid gear and the outer gear to be directly removed from the same end of the central axis, so that when workers replace each gear in the inner and outer cycloid reduction assembly separately, there is no need to remove the entire inner and outer cycloid reduction assembly from the central axis, thereby facilitating the workers to replace parts of the hub motor.

[0011] Specifically, the motor assembly includes a mounting shell, a stator and a rotor, the mounting shell is provided with a through hole along its rotation axis and is sleeved on the central axis through the through hole;

[0012] The rotor is rotatably connected to the central shaft via a bearing, and a magnetic steel is provided on the outer side of the rotor;

[0013] The stator is arranged inside the installation shell, and a coil matched with the magnetic steel is arranged on the stator.

[0014] By adopting the above technical solution, the stator can drive the rotor to rotate around the rotating shaft through the coil, so that power can be output to the outside through the rotor.

[0015] Furthermore, the motor assembly also includes a Hall plate, and the Hall plate is arranged on the mounting shell.

[0016] By adopting the above technical solution, the Hall plate can detect the position and speed of the rotor and feed back the detection results to the vehicle controller, so that the controller can control the hub motor with the inner and outer cycloid structure.

[0017] Furthermore, the motor assembly also includes a multi-pole magnetic ring adapted to the Hall plate, and the multi-pole magnetic ring is arranged on a side of the rotor close to the Hall plate.

[0018] By adopting the above technical solution, since the positive and negative magnetic poles are alternately distributed on the multi-polar magnetic ring in the circumferential direction, and the rotor can drive the multi-polar magnetic ring to rotate together, the Hall element on the Hall plate can determine the position and speed of the rotor by sensing the magnetic poles on the multi-polar magnetic ring, without extending the detection end of the Hall element between the stator and the rotor, thereby facilitating the installation of the Hall plate.

[0019] Furthermore, the motor assembly also includes a power cord, and a wiring hole leading to the interior of the hub shell is provided on the shaft body on the central axis extending outside the hub shell, one end of the power cord is provided with a plug, and the other end of the power cord passes through the wiring hole to be connected to the stator and the Hall plate.

[0020] By adopting the above technical solution, the hub motor with an inner and outer cycloid structure can be connected to the vehicle's power supply device and controller through the plug on the power cord, so that the power supply device can provide power to the stator and the Hall plate through the power cord, and the controller can be electrically connected to the Hall plate through the power cord.

[0021] Furthermore, an eccentric cam is provided on one side of the rotor close to the inner and outer cycloid reduction assembly, and an input ring is provided on one gear surface of the cycloid gear, and the input ring is mounted on the eccentric cam via a bearing sleeve;

[0022] An output ring is arranged on a gear surface of the external gear which is away from the rotor, and the output ring is drivingly connected to the hub shell.

[0023] By adopting the above technical solution, the rotor can drive the eccentric cam to rotate around the central axis, so that the cycloid gear can be driven to perform planetary rotation in the internal gear through the eccentric cam, and the eccentric gear can drive the external gear and the output ring to rotate in the same direction, thereby driving the hub shell to rotate.

[0024] Furthermore, a clutch is provided between the output ring and the hub shell.

[0025] By adopting the above technical solution, the setting of the clutch can control the power transmission between the output ring and the hub shell.

[0026] Specifically, both ends of the central shaft are provided with chamfered threaded sections for connecting with the vehicle frame.

[0027] By adopting the above technical solution, the central shaft can be threadedly connected to the frame of the vehicle through the chamfered thread section, so as to improve the stability of the connection between the central shaft and the frame.

[0028] In summary, this application includes the following beneficial technical effects:

[0029] It includes a hub shell, a center shaft, a motor assembly and an inner and outer cycloid reduction assembly. The hub shell is provided with a mounting hole along its rotation axis. The center shaft is inserted into the mounting hole and connected to the motor assembly. The inner and outer cycloid reduction assembly includes a cycloid gear, an inner gear and an outer gear. The cycloid gear is annular and is provided with outer teeth and inner teeth. The inner gear is sleeved on the cycloid gear and forms an outer cycloid gear set with the outer teeth. The cycloid gear is sleeved on the outer gear and forms an inner cycloid gear set with the outer gear via the inner teeth. The outer gear is transmission-connected to the hub shell. The output shaft of the motor assembly is transmission-connected to the cycloid gear and can drive the cycloid gear to perform planetary rotation around the center axis, so as to drive the outer gear via the cycloid gear. The wheels rotate in the same direction; since the inner and outer cycloid reduction assembly adopts the planetary transmission principle with small tooth difference, not only the overall space occupied is small, but also a large speed ratio can be achieved between its own power input end and power output end, so that the hub motor with the inner and outer cycloid structure has the advantages of small size, light weight and low energy consumption; and the design of the inner and outer cycloid reduction assembly also makes it possible for the internal gear, cycloid gear and external gear to be directly removed from the same end of the center shaft, so that when workers replace each gear in the inner and outer cycloid reduction assembly separately, there is no need to remove the entire inner and outer cycloid reduction assembly from the center shaft, which makes it convenient for workers to replace parts of the hub motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a stereoscopic diagram of a hub motor with an inner and outer cycloid structure of the present application;

[0031] Figure 2 is along Figure 1 A schematic cross-sectional view taken along the central axis of the central axis;

[0032] Figure 3 It is an exploded view of a hub motor with an inner and outer cycloid structure of the present application, which shows a motor assembly, an inner and outer cycloid reduction assembly and a central shaft.

[0033] Figure numerals: 1. hub shell; 2. center axis; 21. chamfered threaded section; 3. motor assembly; 31. mounting shell; 32. stator; 33. rotor; 331. eccentric cam; 34. Hall plate; 35. multi-pole magnetic ring; 36. power cord; 361. plug; 4. inner and outer cycloid reduction assembly; 41. cycloid gear; 411. input ring; 42. internal gear; 43. external gear; 431. output ring; 5. clutch. DETAILED DESCRIPTION

[0034] Figure 1 This is a stereoscopic diagram of a hub motor with an inner and outer cycloid structure of the present application. Figure 2is along Figure 1 A schematic cross-sectional view of the central axis of the central axis. Figure 1 and Figure 2 The present application provides a hub motor with an inner and outer cycloid structure, comprising: a hub shell 1, a central shaft 2, a motor assembly 3 and an inner and outer cycloid reduction assembly 4, wherein the hub shell 1 is provided with a mounting hole along its rotation axis, the central shaft 2 is inserted into the mounting hole and connected to the motor assembly 3, and both ends of the central shaft 2 are provided with a faceted threaded section 21 for connecting with a vehicle frame, so that the central shaft 2 can be threadedly connected with the vehicle frame through the faceted threaded section 21, thereby improving the stability of the connection between the central shaft 2 and the vehicle frame; the motor assembly 3 comprises a mounting shell 31, a stator 32 and a rotor 33, the mounting shell 31 is provided with a through hole along its rotation axis and is sleeved on the central shaft 2 through the through hole; the rotor 33 is rotatably connected to the central shaft 2 through a bearing, and a magnet is provided on the outer side of the rotor 33; the stator 32 is arranged inside the mounting shell 31, and a coil matched with the magnet is provided on the stator 32 and can drive the rotor 33 to rotate around the rotation axis through the coil, so that power can be output outward through the rotor 33.

[0035] Figure 3 : is an exploded view of a hub motor with an inner and outer cycloid structure of the present application, which shows the motor assembly, the inner and outer cycloid reduction assembly and the central shaft. Figure 2 and Figure 3 The inner and outer cycloid reduction assembly 4 includes a cycloid gear 41, an inner gear 42 and an outer gear 43. The cycloid gear 41 is annular and is provided with outer teeth and inner teeth. The inner gear 42 is sleeved on the cycloid gear 41 and forms an outer cycloid gear 41 group with the outer teeth. The cycloid gear 41 is sleeved on the outer gear 43 and forms an inner cycloid gear 41 group with the outer gear 43 via the inner teeth. An eccentric cam 331 is provided on the side of the rotor 33 close to the inner and outer cycloid reduction assembly 4. An input ring 411 is provided on the gear surface of one side of the cycloid gear 41. The input ring 411 is sleeved on the eccentric cam 331 via a bearing. An output ring 431 is provided on the gear surface of the outer gear 43 away from the rotor 33. The output ring 431 is connected to the hub shell 1 through a clutch 5. The clutch 5 can be a wedge-type one-way bearing so that the power transmission between the output ring 431 and the hub shell 1 can be controlled by the clutch 5.

[0036] Through the above arrangement, the rotor 33 can drive the eccentric cam 331 to rotate around the central axis 2, so that the cycloid gear 41 can be driven to perform planetary rotation around the central axis 2 through the cooperation between the outer teeth of the cycloid gear 41 and the inner gear 42. At the same time, the inner teeth of the cycloid gear 41 can cooperate with the outer gear 43 to drive the outer gear 43 to drive the hub shell 1 to rotate in the same direction. Since the inner and outer cycloid reduction assembly 4 adopts the principle of planetary transmission with a small tooth difference, not only is the overall space occupied smaller, but also a larger speed ratio can be achieved between its own power input end and power output end, so that the hub motor with the inner and outer cycloid structure has the advantages of small size, light weight and low energy consumption; and the design of the inner and outer cycloid reduction assembly 4 also enables the internal gear 42, the cycloid gear 41 and the outer gear 43 to be directly removed from the same end of the central axis 2, so that when workers replace each gear in the inner and outer cycloid reduction assembly 4 separately, there is no need to remove the inner and outer cycloid reduction assembly 4 as a whole from the central axis 2, thereby facilitating the workers to replace the parts of the hub motor.

[0037] See also Figure 2 and Figure 3 The motor assembly 3 also includes a Hall plate 34 and a multi-polar magnetic ring 35 adapted to the Hall plate 34. The Hall plate 34 is arranged on the mounting shell 31. The Hall plate 34 can detect the position and speed of the rotor 33 and feed back the detection results to the vehicle controller, so that the controller can control the hub motor with an inner and outer cycloid structure; the multi-polar magnetic ring 35 is arranged on the side of the rotor 33 close to the Hall plate 34. Since the multi-polar magnetic ring 35 has positive and negative magnetic poles alternately distributed along the circumferential direction, and the rotor 33 can drive the multi-polar magnetic ring 35 to rotate together, so that the Hall element on the Hall plate 34 can judge the position and speed of the rotor 33 by sensing the magnetic poles on the multi-polar magnetic ring 35, without extending the detection end of the Hall element between the stator 32 and the rotor 33, thereby facilitating the installation of the Hall plate 34.

[0038] See also Figure 2 and Figure 3 The motor assembly 3 also includes a power cord 36. A wiring hole leading to the inside of the hub shell 1 is provided on the shaft body of the central shaft 2 extending outside the hub shell 1. A plug 361 is provided at one end of the power cord 36. The other end of the power cord 36 passes through the wiring hole and is connected to the stator 32 and the Hall plate 34, so that the hub motor with an inner and outer cycloid structure can be connected to the power supply device and the controller of the vehicle through the plug 361 on the power cord 36, so that the power supply device can provide power to the stator 32 and the Hall plate 34 through the power cord 36, and the controller can be electrically connected to the Hall plate 34 through the power cord 36.

[0039] The working principle of the hub motor with an inner and outer cycloid structure in the present application is as follows:

[0040] The wheel hub shell 1 includes a mounting hole along its rotation axis, the center axis 2 is inserted into the mounting hole and connected to the motor assembly 3; the inner and outer cycloid reduction assembly 4 includes a cycloid gear 41, an inner gear 42 and an outer gear 43, the cycloid gear 41 is annular and is provided with outer teeth and inner teeth, the inner gear 42 is sleeved on the cycloid gear 41 and forms an outer cycloid gear 41 group with the outer teeth, the cycloid gear 41 is sleeved on the outer gear 43 and forms an inner cycloid gear 41 group with the outer gear 43 via the inner teeth, the outer gear 43 is connected to the wheel hub shell 1 in transmission connection, the output shaft of the motor assembly 3 is connected to the cycloid gear 41 in transmission connection and can drive the cycloid gear 41 to perform planetary rotation around the center axis 2 , so as to drive the outer gear 43 to rotate in the same direction via the cycloid gear 41; since the inner and outer cycloid reduction assembly 4 adopts the principle of planetary transmission with small tooth difference, not only the overall space occupied is small, but also a large speed ratio can be achieved between its own power input end and power output end, so that the hub motor with the inner and outer cycloid structure has the advantages of small size, light weight and low energy consumption; and the design of the inner and outer cycloid reduction assembly 4 also makes it possible for the internal gear 42, the cycloid gear 41 and the outer gear 43 to be directly removed from the same end of the central shaft 2, so that when workers replace each gear in the inner and outer cycloid reduction assembly 4 separately, there is no need to remove the inner and outer cycloid reduction assembly 4 as a whole from the central shaft 2, thereby facilitating the workers to replace the parts of the hub motor.

[0041] It should be noted that the above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hub motor with an inner and outer cycloid structure, characterized in that: The invention comprises a wheel hub shell (1), a central shaft (2), a motor assembly (3) and an inner and outer cycloid reduction assembly (4); the wheel hub shell (1) is provided with a mounting hole along its rotation axis, the central shaft (2) is inserted into the mounting hole and connected to the motor assembly (3); The inner and outer cycloid reduction assembly (4) comprises a cycloid gear (41), an inner gear (42) and an outer gear (43); the cycloid gear (41) is annular and provided with outer teeth and inner teeth; the inner gear (42) is sleeved on the cycloid gear (41) and forms an outer cycloid gear (41) group with the outer teeth; the cycloid gear (41) is sleeved on the outer gear (43) and forms an inner cycloid gear (41) group with the outer gear (43) via the inner teeth; the outer gear (43) is transmission-connected to the wheel hub housing (1); the output shaft of the motor assembly (3) is transmission-connected to the cycloid gear (41) and can drive the cycloid gear (41) to perform planetary rotation around the central axis (2), so as to drive the outer gear (43) to rotate in the same direction via the cycloid gear (41).

2. The hub motor with an epicycloid structure according to claim 1, characterized in that: The motor assembly (3) comprises a mounting shell (31), a stator (32) and a rotor (33); the mounting shell (31) is provided with a through hole along its rotation axis and is sleeved on the central shaft (2) via the through hole; The rotor (33) is rotatably connected to the central shaft (2) via a bearing, and a magnetic steel is provided on the outer side of the rotor (33); The stator (32) is arranged inside the mounting shell (31), and a coil matched with the magnetic steel is arranged on the stator (32).

3. The hub motor with an epicycloid structure according to claim 2, characterized in that: The motor assembly (3) further comprises a Hall plate (34), wherein the Hall plate (34) is arranged on the mounting shell (31).

4. The hub motor with an epicycloid structure according to claim 3, characterized in that: The motor assembly (3) further comprises a multi-pole magnetic ring (35) adapted to the Hall plate (34); the multi-pole magnetic ring (35) is arranged on a side of the rotor (33) close to the Hall plate (34).

5. The hub motor with an epicycloid structure according to claim 3, characterized in that: The motor assembly (3) also includes a power cord (36); a wiring hole leading to the interior of the hub shell (1) is provided on the shaft body of the central shaft (2) extending outside the hub shell (1); one end of the power cord (36) is provided with a plug (361); the other end of the power cord (36) passes through the wiring hole to be connected to the stator (32) and the Hall plate (34).

6. The hub motor with an epicycloid structure according to claim 5, characterized in that: An eccentric cam (331) is provided on one side of the rotor (33) close to the inner and outer cycloid speed reduction assembly (4); an input ring (411) is provided on one gear surface of the cycloid gear (41); the input ring (411) is sleeved on the eccentric cam (331) via a bearing; An output ring (431) is provided on a gear surface on a side of the external gear (43) away from the rotor (33), and the output ring (431) is drivingly connected to the hub shell (1).

7. The hub motor with an epicycloid structure according to claim 6, characterized in that: A clutch (5) is provided between the output ring (431) and the wheel hub shell (1).

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