An integrated hub motor

Abstract

This utility model provides an integrated hub motor, belonging to the field of hub motor technology. It solves the problem of low integration in existing hub motors. This integrated hub motor includes a motor housing, a motor shaft rotatably connected inside the motor housing, a gear ring fixed to the motor housing, a planetary carrier rotatably connected inside the gear ring, a sun gear at one end of the motor shaft and disposed within the planetary carrier, and a motor rotor fixed to the other end of the motor shaft. A motor stator is sleeved on the gear ring, and planetary gears are rotatably connected to the planetary carrier, located between the gear ring and the sun gear and meshing with both. A hub is fixed to one end of the planetary carrier. This integrated hub motor utilizes the axial space between the hub and the motor housing without affecting the rotation of the hub, avoiding the need to place both outside the motor stator, increasing the overall installation space, and improving the overall integration of the hub motor.

Description

Technical Field

[0001] This utility model belongs to the field of hub motor technology and relates to an integrated hub motor. Background Technology

[0002] Existing hub motors need to be installed on vehicles or other machines. When driving the vehicle or other machine to move, the hub motor drives the hub to rotate, thereby moving the vehicle or other machine. During movement, it bears a lot of pressure, so the performance requirements for hub motors are high. Hub motors need to be small in size while also achieving high power, so as to ensure efficient operation of the hub motor while being easy to install.

[0003] For example, Chinese patent application [Authorization Announcement No.: CN217951125U] discloses a drive reducer for an intelligent sweeping robot, including a motor assembly, a gearbox assembly, and a tire assembly. The tire assembly is located on one side of the gearbox assembly, and the motor assembly is located on the other side of the gearbox assembly. The gearbox assembly includes a first internal gear ring, a second internal gear ring, a first planetary gear set, a second planetary gear set, a first drive plate, and a second drive plate, all pre-installed in a gear cover. The first internal gear ring meshes with the first planetary gear set, which is connected to the first drive plate via a first connecting shaft. The second internal gear ring is fixed on the side of the first drive plate away from the first planetary gear set and meshes with the second planetary gear set. The second planetary gear set is connected to the second drive plate via a second connecting shaft. The side of the second drive plate away from the second planetary gear set has an output shaft, which passes through a ball bearing and is connected and fixed to the tire assembly.

[0004] In the above structure, the gearbox assembly is located inside the gear cover, and the motor assembly is located on the other side of the gearbox assembly. Therefore, the gearbox assembly and the motor assembly are distributed sequentially, resulting in a low degree of integration between the two and a large required installation space. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an integrated hub motor. The technical problem this invention aims to solve is: how to address the low integration level of existing hub motors.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An integrated hub motor includes a motor housing, within which a motor shaft is rotatably connected. The motor housing is characterized by a gear ring fixedly connected to it, a planetary carrier rotatably connected within the gear ring, a sun gear at one end of the motor shaft disposed within the planetary carrier, a motor rotor fixedly connected to the other end of the motor shaft, a motor stator sleeved on the gear ring, planetary gears rotatably connected to the planetary carrier, the planetary gears being located between and meshing with both the gear ring and the sun gear, and a hub fixedly connected to one end of the planetary carrier.

[0008] By incorporating a sun gear at one end of the motor shaft (either integrally formed or a separate design with bolted connections), a gear ring is fixed to the motor housing. A planetary carrier is rotatably connected within the gear ring, and planetary gears are rotatably connected to the planetary carrier. The planetary gear housing is located between the sun gear and the gear ring, meshing with both to reduce motor speed. This ensures stable drive of the hub rotation during motor operation. The motor rotor is fitted outside the gear ring, while the other end of the motor shaft is connected to the motor rotor. This allows both the planetary carrier and gear ring to be located within the stator. Since a relatively large space is typically reserved between the hub and the motor housing, placing the planetary carrier and gear ring within the stator utilizes the axial space between the hub and the motor housing without affecting hub rotation. This avoids the need to place them outside the stator, increasing overall installation space and improving the overall integration of the hub motor.

[0009] In the aforementioned integrated hub motor, a hollow columnar insertion part is protruded on the planetary carrier, and a mounting hole is provided in the middle of the hub. The insertion part is embedded in the mounting hole, and the planetary carrier and the hub are fixedly connected by fasteners.

[0010] The mating of the connector and the mounting hole enables the pre-positioning of the planetary carrier and the wheel hub. After the pre-positioning is completed, the planetary carrier and the wheel hub are fixed together by fasteners, which facilitates installation and ensures the stability of the wheel hub installation even in a limited installation space.

[0011] In the aforementioned integrated hub motor, a bearing is fitted onto the motor rotor, and the gear ring extends axially to form an annular abutment portion. The inner wall of the abutment portion is an arc surface, and the outer ring of the bearing abuts against the inner wall of the abutment portion.

[0012] By forming a retaining part on the gear ring, the outer ring of the bearing fitted on the motor rotor abuts against the inner wall of the retaining part, so that the gear ring not only meshes with the planetary gear, but also provides support, making the rotation of the motor rotor more stable.

[0013] In the aforementioned integrated hub motor, a second bearing is sleeved on the motor shaft, the inner sidewall of the planetary carrier protrudes radially inward to form an annular limiting step, a retaining spring is snapped onto the inner sidewall of the planetary carrier, and the outer ring of the second bearing is disposed between the limiting stop and the retaining spring.

[0014] The inclusion of bearing two enhances the connection stability of the planetary carrier embedded in the motor housing, allowing the planetary carrier to be stably supported by the motor shaft during rotation, thus improving integration while ensuring installation stability.

[0015] In the aforementioned integrated hub motor, bearings three and four are fitted at both ends of the planetary carrier. The inner wall of the abutment portion is recessed outward along the circumferential direction to form an annular spacer groove. A spacer washer is provided in the spacer groove. The outer ring of bearing three abuts against the inner wall of the abutment portion, and the outer ring of bearing four abuts against the inner wall of the gear ring. The spacer washer is placed between bearing three and bearing one and abuts against the outer rings of both along the axial direction.

[0016] Bearings three and four serve to stably support the planetary carrier within the gear ring. Bearings three and one are located on the same side of the gear ring. To quickly install bearings one and three, a spacer groove is provided on the inner wall of the abutment part, and a spacer washer is placed in the spacer groove. This achieves axial positioning of the outer rings of adjacent bearings three and one, improving integration and making installation stable.

[0017] In the aforementioned integrated hub motor, an installation step is provided on the outer side wall of the gear ring, and the motor stator is sleeved on the installation step.

[0018] This structural design ensures that the installation of the motor stator does not interfere with other components inside the gear ring, making the installation of the motor stator more stable and improving installation stability.

[0019] Compared with existing technologies, this integrated hub motor has the following advantages: Since there is usually a large space reserved between the hub and the motor housing, the planetary carrier and the ring gear are placed inside the motor stator, making use of the axial space between the hub and the motor housing. This does not affect the rotation of the hub and avoids the need to place both outside the motor stator, which would increase the overall installation space and improve the overall integration of the hub motor. Attached Figure Description

[0020] Figure 1 This is a front view of the present invention.

[0021] Figure 2 yes Figure 1 Sectional view of AA.

[0022] Figure 3 yes Figure 2A magnified view of a portion of point A in the middle.

[0023] Figure 4 This is a schematic diagram of the gear ring in this utility model.

[0024] Figure 5 This is a schematic diagram of the planetary carrier in this utility model.

[0025] In the diagram, 1. Motor housing; 2. Motor shaft; 21. Sun gear; 3. Gear ring; 31. Abutment part; 32. Spacer groove; 33. Spacer washer; 34. Mounting step; 4. Planetary carrier; 41. Planetary gear; 42. Insertion part; 43. Limiting step; 44. Snap ring; 5. Motor rotor; 6. Motor stator; 7. Hub; 71. Mounting hole; 8. Fastener; 9. Bearing 1; 10. Bearing 2; 101. Bearing 3; 102. Bearing 4. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figure 1 and Figure 2 As shown, this integrated hub motor includes a motor housing 1, and a motor shaft 2 is rotatably connected inside the motor housing 1.

[0028] Specifically, such as Figure 1 and Figure 2 As shown, a gear ring 3 is fixedly connected to the motor housing 1, and a planetary carrier 4 is rotatably connected inside the gear ring 3. One end of the motor shaft 2 has a sun gear 21, and this end is located inside the planetary carrier 4. The other end of the motor shaft 2 is fixedly connected to the motor rotor 5. The motor stator 6 is sleeved on the gear ring 3. A planetary gear 41 is rotatably connected to the planetary carrier 4. The planetary gear 41 is located between the gear ring 3 and the sun gear 21 and meshes with both of them. One end of the planetary carrier 4 is fixedly connected to a hub 7.

[0029] By having a sun gear 21 at one end of the motor shaft 2 (either the sun gear 21 can be integrally formed on the motor shaft 2, or the motor shaft 2 and the sun gear 21 can be designed separately and connected by bolts), a gear ring 3 can be fixed on the motor housing 1. A planetary carrier 4 is rotatably connected inside the gear ring 3, and a planetary gear 41 is rotatably connected on the planetary carrier 4. At this time, the planetary gear 41 is located between the sun gear 21 and the gear ring 3 and meshes with both of them, which has the effect of speeding up the motor, thereby ensuring that the motor can stably drive the hub 7 to rotate during operation. The motor rotor 5 is sleeved on the outside of the gear ring 3, and the other end of the motor shaft 2 is connected to the motor rotor 5, so that the planetary carrier 4 and the gear ring 3 are both located inside the electronic stator. Since there is usually a large space reserved between the hub 7 and the motor housing 1, the planetary carrier 4 and the gear ring 3 are placed inside the motor stator 6, which utilizes the axial space between the hub 7 and the motor housing 1, and does not affect the rotation of the hub 7. This avoids the need to place both outside the motor stator 6, which would increase the overall installation space and improve the overall integration of the hub 7 motor.

[0030] like Figure 2-4 As shown, a hollow columnar insertion part 42 is protruded on the planetary carrier 4. A mounting hole 71 is provided in the middle of the hub 7. The insertion part 42 is embedded in the mounting hole 71 and the planetary carrier 4 and the hub 7 are fixedly connected by fasteners 8. A mounting step 34 is provided on the outer side wall of the gear ring 3. The motor stator 6 is sleeved on the mounting step 34.

[0031] like Figure 2-5 As shown, a bearing 9 is fitted onto the motor rotor 5. A gear ring 3 extends axially to form an annular abutment part 31. The inner wall of the abutment part 31 is arc-shaped. The outer ring of the bearing 9 abuts against the inner wall of the abutment part 31. A bearing 10 is fitted onto the motor shaft 2. The inner sidewall of the planetary carrier 4 protrudes radially inward to form an annular limiting flange 43. A retaining spring 44 is snapped onto the inner sidewall of the planetary carrier 4. The outer ring of the bearing 10 is disposed between the limiting flange 43 and the retaining spring. Between 44, bearings 3101 and 4102 are fitted at both ends of the planetary carrier 4. The inner wall of the abutment part 31 is recessed outward along the circumferential direction to form an annular spacer groove 32. A spacer washer 33 is provided in the spacer groove 32. The outer ring of bearing 31 abuts against the inner wall of the abutment part 31, and the outer ring of bearing 4102 abuts against the inner wall of the gear ring 3. The spacer washer 33 is placed between bearing 3101 and bearing 9 and abuts against the outer rings of both along the axial direction.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An integrated wheel motor, comprising a motor housing (1), a motor shaft (2) being rotatably connected in the motor housing (1), characterized in that, A gear ring (3) is fixedly connected to the motor housing (1), and a planetary carrier (4) is rotatably connected inside the gear ring (3). One end of the motor shaft (2) has a sun gear (21), and this end is located inside the planetary carrier (4). The other end of the motor shaft (2) is fixedly connected to the motor rotor (5). A motor stator (6) is sleeved on the gear ring (3). A planetary gear (41) is rotatably connected to the planetary carrier (4). The planetary gear (41) is located between the gear ring (3) and the sun gear (21) and meshes with both of them. A hub (7) is fixedly connected to one end of the planetary carrier (4).

2. The integrated in-wheel motor according to claim 1, characterized by, The planetary carrier (4) has a hollow column-shaped insertion part (42) protruding on it. The hub (7) has a mounting hole (71) in the middle. The insertion part (42) is embedded in the mounting hole (71) and the planetary carrier (4) and the hub (7) are fixedly connected by fasteners (8).

3. The integrated in-wheel motor according to claim 1 or 2, characterized by, The motor rotor (5) is fitted with a bearing (9), and the gear ring (3) extends axially to form an annular abutment part (31). The inner wall of the abutment part (31) is an arc surface, and the outer ring of the bearing (9) abuts against the inner wall of the abutment part (31).

4. The integrated in-wheel motor according to claim 3, characterized by The motor shaft (2) is fitted with a bearing (10), the inner wall of the planetary carrier (4) protrudes radially inward to form an annular limiting flange (43), a retaining ring (44) is snapped onto the inner wall of the planetary carrier (4), and the outer ring of the bearing (10) is disposed between the limiting flange (43) and the retaining ring (44).

5. The integrated in-wheel motor according to claim 4, characterized by The planetary carrier (4) is fitted with bearing three (101) and bearing four (102) at both ends. The inner wall of the abutment part (31) is recessed outward along the circumferential direction to form an annular spacer groove (32). A spacer washer (33) is provided in the spacer groove (32). The outer ring of bearing three (101) abuts against the inner wall of the abutment part (31), and the outer ring of bearing four (102) abuts against the inner wall of the gear ring (3). The spacer washer (33) is placed between bearing three (101) and bearing one (9) and abuts against the outer rings of both along the axial direction.

6. The integrated in-wheel motor according to claim 1 or 2, characterized by, An installation step (34) is provided on the outer side wall of the gear ring (3), and the motor stator (6) is sleeved on the installation step (34).

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