A wheel hub motor, drive wheel and lawnmower

Abstract

The application provides a kind of hub motor, drive wheel and mower, the hub motor includes fixed seat, motor assembly, planet carrier, box and output ring, motor assembly is arranged on fixed seat, planet carrier is fixedly connected with fixed seat, output ring cover is arranged outside planet carrier and can rotate relative to fixed seat, box cover is arranged outside output ring and can rotate relative to fixed seat, the power output end of motor assembly is connected with first sun gear and second sun gear;By setting the engagement of first planetary gear and first ring gear, first sun gear and the engagement of second planetary gear and second ring gear, second sun gear, the same motor assembly can drive output ring and box two independent rotating members to rotate around its own axis at the same time, realize the double-end independent output of hub motor, without additional setting independent motor, reduce the cost, improve the integration.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a hub motor, a drive wheel, and a lawnmower. Background Technology

[0002] A hub motor is a drive unit that highly integrates power and transmission within the wheel hub. Due to its compact structure and flexible control, it is increasingly widely used in electric vehicles, mobile robots, and garden machinery. Traditional hub motors typically use a single output shaft or a single rotating housing as the power output end, directly or after reduction gearing to drive the wheel to rotate and achieve mobility. In existing technology, hub motors generally have a single-ended output, meaning the torque generated by the motor can only be transmitted to one load component (such as the rim or tire), and cannot simultaneously provide driving force to two independent rotating parts.

[0003] With the increasing demand for multi-functional integration in intelligent equipment, certain applications, such as autonomous lawnmowers, omnidirectional mobile platforms, and multi-axle steering vehicles, not only require hub motors to drive the wheels, but also desire to use the same power source to drive adjacent auxiliary working devices, such as the mowing blade, steering arm, and cleaning brush. However, existing single-end output hub motors are insufficient to meet these requirements. Adding an independent drive motor would increase material and assembly costs, significantly increasing the overall cost of the drive system. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a hub motor that solves the problem that in the prior art, a single-end output hub motor can only achieve a single driving force output, and if it is necessary to drive other auxiliary working devices, an additional independent drive motor is required, which leads to increased costs.

[0005] This invention provides a hub motor, including a fixed base, a motor assembly, a planetary carrier, a housing, and an output ring. The motor assembly is mounted on the fixed base, the planetary carrier is fixedly connected to the fixed base, the output ring is disposed on the outside of the planetary carrier, and the output ring is rotatable relative to the fixed base. The housing is disposed on the outside of the output ring and is coaxially arranged with the output ring, and the housing is rotatable relative to the fixed base. The planetary carrier has a first mounting slot and a second mounting slot, which are spaced apart along the axial direction of the planetary carrier. A first planetary gear is rotatably connected in the first mounting slot, and a second planetary gear is rotatably connected in the second mounting slot. The power output end of the motor assembly is connected to a first sun gear and a second sun gear. The output ring is provided with a first gear ring, and the housing is provided with a second gear ring. The first planetary gear meshes between the first gear ring and the first sun gear, so that the first gear ring receives the driving force of the motor assembly and drives the output ring to rotate around its own axis. The second planetary gear meshes between the second gear ring and the second sun gear, so that the second gear ring receives the driving force of the motor assembly and drives the housing to rotate around its own axis.

[0006] In one feasible implementation, the motor assembly includes a stator, a rotor, a first rotating shaft, and a second rotating shaft. The stator is fixedly mounted on the fixed base. One end of the first rotating shaft is rotatably connected to the fixed base, and the other end is connected to a first sun gear. The shaft of the first rotating shaft is fixedly connected to the rotor. The position of the first sun gear corresponds to the position of the first mounting slot. One end of the second rotating shaft is rotatably connected to the planetary carrier, and the other end is connected to a second sun gear. The position of the second sun gear corresponds to the position of the second mounting slot. The first rotating shaft and the second rotating shaft are coaxially arranged, and the axial end face of the first rotating shaft is fixedly connected to the axial end face of the second rotating shaft. The stator is used to drive the rotor, together with the first rotating shaft and the second rotating shaft, to rotate relative to the planetary carrier, thereby driving the first sun gear and the second sun gear to rotate.

[0007] In one feasible implementation, the axial end face of the first rotating shaft is provided with an external spline shaft, and the axial end face of the second rotating shaft is provided with an internal spline groove adapted to the external spline shaft. The external spline shaft is inserted into the internal spline groove so that the first rotating shaft and the second rotating shaft are relatively fixed in the circumferential direction.

[0008] In one feasible implementation, the first mounting slot is formed on the planetary carrier at one end near the fixed base, and the second mounting slot is formed on the planetary carrier at one end away from the fixed base.

[0009] In one feasible implementation, a first bearing is provided between the fixed base and the output ring to allow the output ring to rotate relative to the fixed base, and a second bearing is provided between the output ring and the housing to allow the housing to rotate relative to the output ring.

[0010] In one feasible embodiment, a first oil seal is provided between the fixed base and the output ring, the first oil seal being used to seal the gap between the output ring and the fixed base, and a second oil seal is provided between the output ring and the housing, the second oil seal being used to seal the gap between the housing and the output ring.

[0011] In one feasible implementation, the end of the fixed base extending into the output ring is fixedly connected to the planetary carrier, and the end of the fixed base extending outside the output ring is used to connect to an external fixing member to support the hub motor.

[0012] In one feasible implementation, the end of the planetary carrier away from the fixed seat extends out of the housing body, and the planetary carrier and the fixed seat are respectively connected to the external fixing members from both sides of the hub motor to form a double-end support.

[0013] The present invention also provides a drive wheel, including a hub motor as described in any of the above claims.

[0014] The present invention also provides a lawnmower, including the drive wheel as described above.

[0015] Beneficial effects: This invention provides a hub motor, a drive wheel, and a lawnmower. The hub motor includes a fixed base, a motor assembly, a planetary carrier, a housing, and an output ring. The motor assembly is mounted on the fixed base, the planetary carrier is fixedly connected to the fixed base, the output ring is mounted on the outside of the planetary carrier and can rotate relative to the fixed base, and the housing is mounted on the outside of the output ring and can rotate relative to the fixed base. The power output end of the motor assembly is connected to a first sun gear and a second sun gear. By setting the meshing of the first planetary gear with the first ring gear and the first sun gear, and the meshing of the second planetary gear with the second ring gear and the second sun gear, the same motor assembly can simultaneously drive two independent rotating components, the output ring and the housing, to rotate around their own axes. This achieves independent output from both ends of the hub motor, eliminating the need for an additional independent motor, reducing costs, and improving integration. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the hub motor of the present invention; Figure 2 for Figure 1 Cross-sectional view of AA in the middle; Figure 3 This is a schematic diagram of the planetary carrier structure of the present invention; Figure 4 This is a schematic diagram of the drive wheel of the present invention.

[0018] In the diagram: 101, fixed base; 102, planetary carrier; 103, housing; 104, output ring; 105, hub; 111, stator; 112, rotor; 113, first shaft; 114, second shaft; 115, first sun gear; 116, second sun gear; 117, external spline shaft; 118, internal spline groove; 121, first mounting slot; 122, second mounting slot; 123, first planetary gear; 124, second planetary gear; 125, first gear ring; 126, second gear ring; 127, first bearing; 128, second bearing; 129, first oil seal; 130, second oil seal; 131, bracket; 132, rotating frame; 133, first bevel gear; 134, second bevel gear; 135, gearbox; 136, drive belt. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 4 The present invention provides a hub motor, including a fixed base 101, a motor assembly, a planetary carrier 102, a housing 103, and an output ring 104. The motor assembly is disposed on the fixed base 101, the planetary carrier 102 is fixedly connected to the fixed base 101, the output ring 104 is disposed on the outside of the planetary carrier 102, and the output ring 104 is rotatable relative to the fixed base 101. The housing 103 is disposed on the outside of the output ring 104 and is coaxially arranged with the output ring 104, and the housing 103 is rotatable relative to the fixed base 101. The planetary carrier 102 has a first mounting groove 121 and a second mounting groove 122. The first mounting groove 121 and the second mounting groove 122 are spaced apart along the axial direction of the planetary carrier 102. A first planetary gear 123 is rotatably connected in the first mounting groove 121, and a second planetary gear 124 is rotatably connected in the second mounting groove 122. The power output end of the motor assembly is connected to a first sun gear 115 and a second sun gear 116. The output ring 104 is provided with a first gear ring 125, and the housing 103 is provided with a second gear ring 126. The first planetary gear 123 meshes between the first gear ring 125 and the first sun gear 115, so that the first gear ring 125 receives the driving force of the motor assembly and drives the output ring 104 to rotate around its own axis. The second planetary gear 124 meshes between the second gear ring 126 and the second sun gear 116, so that the second gear ring 126 receives the driving force of the motor assembly and drives the housing 103 to rotate around its own axis.

[0021] Specifically, the mounting base 101 is the fixed foundation for the hub motor, used to mount the hub motor onto an external fixed component. The mounting base 101 also serves as the mounting base for the motor assembly, providing support for the motor assembly. The mounting base 101 is fixedly connected to the planetary carrier 102, keeping the planetary carrier 102 stationary. The motor assembly is mounted on the mounting base 101, serving as the sole power source for the hub motor to generate rotational driving force. The first sun gear 115, the first planetary gears 123, and the first ring gear 125 constitute a first-stage planetary gear reduction mechanism. When the first sun gear 115 rotates, it drives the first planetary gear 123, which meshes with it, to rotate. Because the planetary carrier 102 is fixed, the first planetary gear 123 drives the first ring gear 125 to rotate while rotating on its own axis. The first ring gear 125 drives the output ring 104 to rotate around its own axis. The second sun gear 116, the second planetary gear 124, and the second ring gear 126 constitute a second-stage planetary gear reduction mechanism. When the second sun gear 116 rotates, it drives the second planetary gear 124, which meshes with it, to rotate. Since the planetary carrier 102 is fixed, the second planetary gear 124 drives the second ring gear 126 to rotate while rotating on its own axis. The second ring gear 126 drives the housing 103 to rotate around its own axis. The two-stage planetary gear reduction mechanism shares the same planetary carrier 102. The power of the motor assembly is simultaneously input to the two-stage planetary gear reduction mechanism through the first sun gear 115 and the second sun gear 116, driving the output ring 104 and the housing 103 to rotate respectively, thereby achieving independent output at both ends. In addition, since the rotational speeds of the output ring 104 and the housing 103 are determined by the transmission ratios of the two-stage planetary gear reduction mechanism, when the input speed of the motor assembly is the same, different rotational speeds can be achieved by configuring different numbers of teeth for the output ring 104 and the housing 103.

[0022] Therefore, in this application, only one motor assembly is needed to achieve dual-end power output simultaneously, eliminating the need for an additional independent motor and reducing costs. Furthermore, in this application, the output ring 104 and the housing 103 are coaxially fitted, resulting in a compact structure and small axial dimension, making it suitable for installation within the limited space inside the hub 105.

[0023] In this application, the first mounting slot 121 and the second mounting slot 122 are arranged in layers along the axial direction, making full use of the axial space and making the radial dimensions of the hub motor more compact, suitable for installation inside the hub 105. In addition, the first planetary gear 123 and the second planetary gear 124 are independently installed in their respective mounting slots, which facilitates assembly.

[0024] According to some feasible embodiments, the motor assembly includes a stator 111, a rotor 112, a first rotating shaft 113, and a second rotating shaft 114. The stator 111 is fixedly mounted on the fixed base 101. One end of the first rotating shaft 113 is rotatably connected to the fixed base 101, and the other end is connected to a first sun gear 115. The shaft of the first rotating shaft 113 is fixedly connected to the rotor 112. The position of the first sun gear 115 corresponds to the position of the first mounting slot 121. One end of the second rotating shaft 114 is rotatably connected to the planetary carrier. On the planet carrier 102, the other end is connected to the second sun gear 116. The position of the second sun gear 116 corresponds to the position of the second mounting slot 122. The first rotating shaft 113 and the second rotating shaft 114 are coaxially arranged, and the axial end face of the first rotating shaft 113 is fixedly connected to the axial end face of the second rotating shaft 114. The stator 111 is used to drive the rotor 112, together with the first rotating shaft 113 and the second rotating shaft 114, to rotate relative to the planet carrier 102, thereby driving the first sun gear 115 and the second sun gear 116 to rotate. In this embodiment, after the stator 111 is energized, it generates a rotating magnetic field, driving the rotor 112 to rotate. The rotor 112 drives the first rotating shaft 113 to rotate, the first rotating shaft 113 drives the first sun gear 115 to rotate, and at the same time, through the end face connection, it drives the second rotating shaft 114 to rotate, and the second rotating shaft 114 drives the second sun gear 116 to rotate.

[0025] In one feasible embodiment, the axial end face of the first rotating shaft 113 is provided with an external spline shaft 117, and the axial end face of the second rotating shaft 114 is provided with an internal spline groove 118 adapted to the external spline shaft 117. The external spline shaft 117 is inserted into the internal spline groove 118, so that the first rotating shaft 113 and the second rotating shaft 114 are relatively fixed in the circumferential direction. In other embodiments, the first rotating shaft 113 and the second rotating shaft 114 can also be circumferentially fixed by other means, such as by a flat key connection, a polygonal prism insertion fit, etc.

[0026] In one feasible implementation, the first mounting groove 121 is formed on the planetary carrier 102 at one end near the fixed base 101, and the second mounting groove 122 is formed on the planetary carrier 102 at one end away from the fixed base 101.

[0027] In one feasible embodiment, several equal numbers of first planetary gears 123 and second planetary gears 124 are provided, and the first planetary gears 123 and second planetary gears 124 are staggered from each other in the circumferential direction. Specifically, there are three first planetary gears 123, which are evenly spaced along the circumference of the first mounting groove 121; and there are three second planetary gears 124, which are evenly spaced along the circumferential direction of the second mounting groove 122. Furthermore, in the circumferential direction of the planet carrier 102, the mounting positions of the first planetary gears 123 and second planetary gears 124 are not vertically aligned, but offset from each other by a predetermined angle. For example, when viewed along the axial direction of the planet carrier 102, the mounting angles of the first planetary gears 123 and second planetary gears 124 differ by 60° (i.e., half the angle between two adjacent planetary gears). Taking three planetary gears as an example, the three first planetary gears 123 are distributed circumferentially at 0°, 120°, and 240°, while the three second planetary gears 124 are distributed circumferentially at 60°, 180°, and 300°, offset by 60°. When the first planetary gears 123 and second planetary gears 124 are aligned circumferentially, the stress points of the two sets of planetary gears coincide axially, causing the first shaft 113 and the second shaft 114 to be subjected to continuously applied radial forces at the same circumferential position, resulting in stress superposition. Therefore, by offsetting the arrangement of the first planetary gears 123 and second planetary gears 124, the application position of the radial force is offset circumferentially, avoiding continuous stress concentration at the same position, improving the stress state of the first shaft 113 and the second shaft 114, and increasing the service life of the shaft system.

[0028] Furthermore, both the first sun gear 115 and the second sun gear 116 are helical gears, and the direction of the helical teeth of the first sun gear 115 is opposite to that of the second sun gear 116. Correspondingly, the first planetary gear 123, the first ring gear 125, the second planetary gear 124, and the second ring gear 126 are all helical gears, and the direction of the helical teeth of the first planetary gear 123 and the first ring gear 125 matches the direction of the helical teeth of the first sun gear 115, while the direction of the helical teeth of the second planetary gear 124 and the second ring gear 126 matches the direction of the helical teeth of the second sun gear 116. In this application, since the first sun gear 115 and the second sun gear 116 are respectively connected to the same motor assembly, the power of both planetary mechanisms originates from the same shaft. If the direction of the helical teeth of the two planetary mechanisms is the same, the axial force generated by the two mechanisms will be in the same direction, resulting in superimposed axial loads on the planet carrier 102 and the bearings, increasing bearing wear and energy loss.

[0029] For example, the first sun gear 115 uses a right-hand helical gear, and the second sun gear 116 uses a left-hand helical gear. When the motor assembly drives the first shaft 113 and the second shaft 114 to rotate synchronously, the right-hand helical first sun gear 115 drives the first planet gear 123 and the first ring gear 125 to rotate, generating a first axial force; the left-hand helical second sun gear 116 drives the second planet gear 124 and the second ring gear 126 to rotate, generating a second axial force. Since the first axial force and the second axial force act on the upper and lower ends of the planet carrier 102 respectively, and are in opposite directions, the two axial forces cancel each other out on the planet carrier 102. Therefore, the axial forces generated by the two sets of planetary mechanisms are in opposite directions, achieving self-balancing on the planet carrier 102, reducing the additional load of the axial force on the bearings on the planet carrier 102, and extending the service life of the bearings.

[0030] According to some feasible embodiments, a first bearing 127 is provided between the fixed base 101 and the output ring 104 to allow the output ring 104 to rotate relative to the fixed base 101. A second bearing 128 is provided between the output ring 104 and the housing 103 to allow the housing 103 to rotate relative to the output ring 104. In this embodiment, the first bearing 127 and the second bearing 128 respectively ensure the independent rotation of the output ring 104 and the housing 103, and the two do not interfere with each other. In addition, a first oil seal 129 is provided between the fixed base 101 and the output ring 104 to seal the gap between the output ring 104 and the fixed base 101. A second oil seal 130 is provided between the output ring 104 and the housing 103 to seal the gap between the housing 103 and the output ring 104. It is worth noting that the first oil seal 129 is located outside the first bearing 127 to seal the first bearing 127. The second oil seal 130 is located outside the second bearing 128 to seal the second bearing 128. The arrangement of the first oil seal 129 and the second oil seal 130 can prevent the leakage of lubricating grease and the entry of external impurities, ensuring the sealing of the hub motor and improving its service life and reliability.

[0031] According to some feasible embodiments, one end of the fixed base 101 extending into the output ring 104 is fixedly connected to the planetary carrier 102, and the other end of the fixed base 101 extending outside the output ring 104 is used to connect an external fixing component to support the hub motor. The external fixing component can be a vehicle frame or a lawnmower body, etc.

[0032] According to some feasible embodiments, the end of the planetary carrier 102 away from the fixed base 101 extends outside the housing 103. The planetary carrier 102 and the fixed base 101 are respectively connected to the external fixing components from both sides of the hub motor to form a double-end support. In this embodiment, the fixed base 101 and the planetary carrier 102 are respectively connected to the external fixing components from both sides of the hub motor to form a double-end support, ensuring the stability and reliability of the hub motor during operation.

[0033] Existing hub motors typically only perform a single driving function, namely, driving the wheel to rotate. The hub motor drives the wheel to rotate for walking, while the steering motor is independently mounted outside the hub motor or between the frame and the hub, driving the entire drive wheel to deflect around a vertical axis to achieve steering. Therefore, this invention also provides a drive wheel, including a hub motor as described above. Specifically, the drive wheel includes a bracket 131, a rotating frame 132, a first bevel gear 133, a second bevel gear 134, a gearbox 135, a hub 105, and a drive belt 136. The bracket 131 is fixedly mounted on the lawnmower frame, serving as a fixed support base for the drive wheel. The rotating frame 132 is rotatably connected to the bracket 131 via bearings and can rotate relative to the bracket 131 around a vertical axis. Specifically, the hub motor's mounting base 101 and planetary carrier 102 are respectively fixedly connected to the rotating frame 132, so that the hub motor is entirely mounted on the rotating frame 132. When the rotating frame 132 rotates relative to the support 131, the hub motor, together with the rotating frame 132, deflects around the vertical axis.

[0034] The output ring 104 of the hub motor extends to one end of the rotating frame 132, where a first bevel gear 133 is fixedly connected. A second bevel gear 134 is rotatably connected to the bracket 131, with its axis extending vertically. The first bevel gear 133 and the second bevel gear 134 mesh with each other, forming a reversing transmission. Due to the inherent transmission ratio constraint between the output ring 104 and the housing 103, steering speed regulation is achieved through a gearbox 135. The gearbox 135 is fixedly mounted on the bracket 131, and its power input end is fixedly connected to the second bevel gear 134 to receive the power after reversal via the first bevel gear 133 and the second bevel gear 134. The output end of the gearbox 135 is connected to the rotating frame 132 via a transmission belt 136.

[0035] When the output ring 104 rotates, the power is transmitted to the gearbox 135 through the first bevel gear 133 and the second bevel gear 134. After the gearbox 135 reduces the speed and increases the torque, it drives the rotating frame 132 to rotate around the vertical axis relative to the bracket 131 through the transmission belt 136, thereby driving the entire hub motor to deflect and achieve steering.

[0036] The housing 103 is fixedly connected to the hub 105 and is used to drive the hub 105 to rotate around its own axis, so as to drive the lawnmower forward or backward.

[0037] Since the rotation directions of the output ring 104 and the housing 103 are relatively fixed, and the rotation direction of the output ring 104 is determined by the rotation direction of the motor assembly, when the motor assembly rotates forward, the housing 103 drives the hub 105 to rotate forward, and at the same time, the output ring 104 transmits power to the gearbox 135 through the bevel gear set. However, there is no fixed correspondence between the rotation direction of the output ring 104 and the required deflection direction of the rotating frame 132. That is, the forward rotation of the output ring 104 does not necessarily correspond to the rightward deflection of the rotating frame 132, and the reverse rotation of the output ring 104 does not necessarily correspond to the leftward deflection of the rotating frame 132. The directional mapping relationship between the two depends on the internal gear combination configuration of the gearbox 135.

[0038] Therefore, the gearbox 135 is equipped with a reversing gear set, which can output the power from the output ring 104 to the transmission belt 136 in either the forward or reverse direction according to the required deflection direction of the rotating frame 132.

[0039] Specifically, when the lawnmower needs to turn left, the reversing gear set of the gearbox 135 outputs power in a first direction, driving the rotating frame 132 to deflect around the vertical axis in the first direction; when the lawnmower needs to turn right, the reversing gear set of the gearbox 135 outputs power in a second direction, driving the rotating frame 132 to deflect around the vertical axis in the second direction. The first and second directions are opposite. Therefore, regardless of the rotation direction of the output ring 104, the gearbox 135 can independently control the direction of power output to the drive belt 136 according to the required deflection direction of the rotating frame 132, thereby ensuring that the rotating frame 132 deflects in the expected direction and that the lawnmower's steering direction is consistent with the operating command.

[0040] When steering is not required, the gearbox 135 stops power output, and the rotating frame 132 maintains its current orientation. The gearbox 135 is preferably a worm gearbox, which, by utilizing its inherent self-locking characteristics, can withstand the road surface reaction torque from the rotating frame 132, preventing the rotating frame 132 from unexpectedly deflecting under the action of road surface reaction force, and maintaining the stable orientation of the drive wheels.

[0041] Therefore, in this embodiment, by adding a set of planetary gears inside the hub motor, dual output of driving power and steering power can be achieved without the need for an additional independent steering motor.

[0042] This invention also provides a lawnmower, including the drive wheel as described above. A hub motor is installed inside the drive wheel of the lawnmower, providing driving force and steering power. When the lawnmower is traveling at high speed, a relatively smooth steering response is required to avoid tipping or loss of control due to excessive steering. At this time, a larger gear ratio can be selected through the gearbox to reduce the deflection speed of the rotating frame, making the steering action smoother and more controllable. However, at low speeds, a more sensitive steering response is needed for precise control in areas such as lawn edges and around trees. At this time, a smaller gear ratio can be selected through the gearbox to increase the deflection speed of the rotating frame, making the steering action quicker and more flexible.

[0043] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A hub motor, characterized in that, The device includes a fixed base, a motor assembly, a planetary carrier, a housing, and an output ring. The motor assembly is mounted on the fixed base, the planetary carrier is fixedly connected to the fixed base, the output ring is disposed on the outside of the planetary carrier, and the output ring can rotate relative to the fixed base. The housing is disposed on the outside of the output ring and is coaxially arranged with the output ring, and the housing can rotate relative to the fixed base. The planetary carrier has a first mounting slot and a second mounting slot, which are spaced apart along the axial direction of the planetary carrier. A first planetary gear is rotatably connected in the first mounting slot, and a second planetary gear is rotatably connected in the second mounting slot. The power output end of the motor assembly is connected to a first sun gear and a second sun gear. The output ring is provided with a first gear ring, and the housing is provided with a second gear ring. The first planetary gear meshes between the first gear ring and the first sun gear, so that the first gear ring receives the driving force of the motor assembly and drives the output ring to rotate around its own axis. The second planetary gear meshes between the second gear ring and the second sun gear, so that the second gear ring receives the driving force of the motor assembly and drives the housing to rotate around its own axis.

2. The hub motor according to claim 1, characterized in that, The motor assembly includes a stator, a rotor, a first rotating shaft, and a second rotating shaft. The stator is fixedly mounted on the fixed base. One end of the first rotating shaft is rotatably connected to the fixed base, and the other end is connected to a first sun gear. The shaft of the first rotating shaft is fixedly connected to the rotor. The position of the first sun gear corresponds to the position of the first mounting slot. One end of the second rotating shaft is rotatably connected to the planetary carrier, and the other end is connected to a second sun gear. The position of the second sun gear corresponds to the position of the second mounting slot. The first rotating shaft and the second rotating shaft are coaxially arranged, and the axial end face of the first rotating shaft is fixedly connected to the axial end face of the second rotating shaft. The stator is used to drive the rotor, together with the first rotating shaft and the second rotating shaft, to rotate relative to the planetary carrier, thereby driving the first sun gear and the second sun gear to rotate.

3. The hub motor according to claim 2, characterized in that, The first rotating shaft has an external spline protrusion on its axial end face, and the second rotating shaft has an internal spline groove that is adapted to the external spline shaft on its axial end face. The external spline shaft is inserted into the internal spline groove so that the first rotating shaft and the second rotating shaft are relatively fixed in the circumferential direction.

4. The hub motor according to claim 1, characterized in that, The first mounting slot is located on the planetary carrier at one end near the fixed base, and the second mounting slot is located on the planetary carrier at one end away from the fixed base.

5. The hub motor according to claim 1, characterized in that, A first bearing is provided between the fixed base and the output ring so that the output ring can rotate relative to the fixed base. A second bearing is provided between the output ring and the housing so that the housing can rotate relative to the output ring.

6. The hub motor according to claim 1, characterized in that, A first oil seal is provided between the fixed base and the output ring, the first oil seal being used to seal the gap between the output ring and the fixed base. A second oil seal is provided between the output ring and the housing, the second oil seal being used to seal the gap between the housing and the output ring.

7. The hub motor according to claim 1, characterized in that, One end of the fixed base extending into the output ring is fixedly connected to the planetary carrier, and the other end of the fixed base extending outside the output ring is used to connect to an external fixed component to support the hub motor.

8. The hub motor according to claim 7, characterized in that, The planetary carrier extends out of the housing at the end furthest from the fixed base. The planetary carrier and the fixed base are respectively connected to the external fixing components from both sides of the hub motor to form a double-end support.

9. A drive wheel, characterized in that, Including the hub motor as described in any one of claims 1-8.

10. A lawnmower, characterized in that, Includes the drive wheel as described in claim 9.

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