Hub motor and mowing equipment

Abstract

The utility model discloses a wheel hub motor and a mowing device, the wheel hub motor comprises a rotating assembly, a fixing assembly, a transmission assembly and a power assembly, the rotating assembly is rotatably connected with the fixing assembly; the power assembly is used for driving the rotating assembly to rotate relative to the fixed assembly through the transmission assembly after being powered on. The mowing equipment comprises a main body, a tire and the hub motor in any embodiment, a fixing shaft of the hub motor is fixedly connected with the main body, and the tire is arranged on a machine shell of the hub motor in a sleeving mode. According to the hub motor and the mowing equipment, the control influence of fluctuation of an external load on the motor can be reduced, the motor control is better, and meanwhile, the size of the hub motor can be smaller, and the weight of the hub motor is smaller. Compared with a traditional mowing machine, the mowing device is lighter in weight and smaller in size.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a hub motor and lawn mowing equipment. Background Art

[0002] With the development and progress of science and technology, the use of hub motor technology to achieve automatic mowing has the advantages of high operating efficiency and low operating costs. Currently, the widely used automatic lawn mowers usually use two-wheel differential or four-wheel differential to control the movement or steering of the lawn mower. The hub motor controls a single drive wheel to achieve two-wheel differential or four-wheel differential control.

[0003] However, due to the limitations of its structure and volume, the reduction ratio of traditional hub motors is often small. A small reduction ratio means that the motor speed is low and the torque is large before deceleration. The low motor speed and high torque before deceleration require a large hub motor, which will also have a large weight. At the same time, when the reduction ratio is small, the fluctuation of the external load has a great influence on the control of the motor, which is not conducive to the precise control of the motor. Utility Model Content

[0004] Based on this, it is necessary to provide a hub motor and a lawn mowing device to address the technical problem of how to improve the reduction ratio of the motor.

[0005] A hub motor comprises: a rotating assembly, a fixed assembly, a transmission assembly and a power assembly, wherein the rotating assembly is rotatably connected to the fixed assembly, and the power assembly is used to drive the rotating assembly to rotate relative to the fixed assembly through the transmission assembly after power is turned on.

[0006] The rotating assembly includes a housing and a bottom cover, wherein the housing and the bottom cover together form a receiving cavity, and the housing is provided with a first tooth portion at a peripheral area of ​​the top of the receiving cavity; the bottom cover is connected and fixed to the housing, and the bottom cover is provided to cover the opening of the housing;

[0007] The fixing assembly includes a fixing shaft and a fixing frame, one end of the fixing shaft passes through the bottom cover and is rotatably connected to the bottom cover, and the fixing frame is located in the accommodating cavity and is fixedly connected to the fixing shaft;

[0008] The transmission assembly comprises a transmission combination wheel and a transmission shaft, wherein the transmission combination wheel is rotatably mounted on the fixed frame, the transmission combination wheel has a second tooth portion and a third tooth portion that rotate synchronously, the second tooth portion meshes with the first tooth portion, and the transmission shaft has a fourth tooth portion that meshes with the third tooth portion;

[0009] The power assembly includes a stator and a rotor, the stator is connected and fixed to the fixed frame, the rotor is rotatably connected to the stator, the transmission shaft is rotatably connected to the stator, and the transmission shaft passes through the stator and is connected and fixed to the rotor.

[0010] In one embodiment, the housing is provided with a limit axis in the middle area of ​​the top of the accommodating cavity;

[0011] The fixing assembly also includes a top plate and a limit bearing. The top plate is installed on the top of the fixing frame. A limit through hole is opened in the middle area of ​​the top plate. The outer ring of the limit bearing is connected and fixed to the inner wall of the limit through hole, and the inner ring of the limit bearing is connected and fixed to the limit shaft.

[0012] In one embodiment, there are three transmission combination wheels, which are arranged around the transmission shaft, and the second tooth portion of each transmission combination wheel is respectively engaged with the first tooth portion, and the third tooth portion of each transmission combination wheel is respectively engaged with the fourth tooth portion.

[0013] In one embodiment, the fixed frame includes a first circular plate and a second circular plate that are coaxially and parallelly arranged, the edge of the first circular plate and the edge of the second circular plate are connected and fixed by a plurality of connecting columns, the middle area of ​​the axis of the first circular plate is connected and fixed to the end of the fixed shaft, and a receiving space is provided between the first circular plate and the second circular plate, the stator and the rotor are located in the receiving space, the stator is connected and fixed to the second circular plate, the transmission combination wheel is rotatably installed on the second circular plate with its back facing the stator, and the transmission shaft passes through the second circular plate.

[0014] In one of the embodiments, a wiring portion and three connecting columns are integrally extended from the edge of the second circular plate toward the edge of the first circular plate. The three connecting columns are arranged at intervals, and the end of each connecting column is connected and fixed to the edge of the first circular plate by a screw. The wiring portion is located between two of the connecting columns, and is used to pass a cable connected to a circuit board of the stator.

[0015] In one embodiment, the circuit board of the stator is mounted on a side of the second circular plate facing the first circular plate and is completely accommodated in the accommodating space, and the edge of the second circular plate is recessed inward at the circuit board of the stator to form a wiring gap, and the wiring gap is used to expose the interface of the circuit board of the stator.

[0016] In one embodiment, the wiring portion includes a first arc plate and a second arc plate, the first arc plate and the second arc plate are spaced apart, a threading gap is provided between the first arc plate and the second arc plate, and an opening of the threading gap is adjacent to the wiring notch.

[0017] In one embodiment, ends of the first arc plate and the second arc plate abut against an edge of the first circular plate.

[0018] In one embodiment, a clearance gap is formed on the edge of the first circular plate at the abutment position of the first arc plate, and the clearance gap is connected to the threading gap.

[0019] The above-mentioned hub motor drives the rotor to rotate by supplying power to the stator. The rotation process of the rotor synchronously drives the transmission combination wheel to rotate through the transmission shaft. The rotation process of the transmission combination wheel synchronously drives the engine case to rotate. In this way, the reduction module composed of the first tooth portion, the second tooth portion, the third tooth portion, and the fourth tooth portion has a larger reduction ratio. When the reduction ratio is large, the influence of the fluctuation of the external load on the control of the motor will be reduced, the motor control will be better, and at the same time, the size of the hub motor can be made smaller and the weight is also smaller.

[0020] A lawn mowing device comprises a main body, a tire and a hub motor as described in any one of the above embodiments, wherein a fixed shaft of the hub motor is connected and fixed to the main body, and the tire is sleeved on a housing of the hub motor.

[0021] The above-mentioned mowing equipment, through the hub motor with a relatively large deceleration ratio, is lighter and smaller in size than the traditional mower when the output performance is the same after the motor is decelerated. In other words, the weight of the motor of the traditional mower before deceleration is greater than that of the utility model, because in the field of use of mowers, the motor with a low speed and a large torque before deceleration requires a larger volume than the motor with a high speed and a small torque, and the larger the volume, the heavier the weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a hub motor in one embodiment;

[0023] Figure 2 for Figure 1 A schematic structural diagram of the wheel hub motor from another perspective in the illustrated embodiment;

[0024] Figure 3 for Figure 2 A schematic cross-sectional structural diagram of AA of the wheel hub motor in the illustrated embodiment;

[0025] Figure 4 A schematic diagram of the disassembled structure of a hub motor in one embodiment;

[0026] Figure 5 A schematic diagram of the disassembled structure of a hub motor in one embodiment;

[0027] Figure 6 is a schematic diagram of a partial structure of a hub motor in one embodiment;

[0028] Figure 7 for Figure 6 A schematic diagram of a local structure of the wheel hub motor in the illustrated embodiment from another perspective;

[0029] Figure 8 is a schematic structural diagram of a housing of a hub motor in one embodiment;

[0030] Fig. 9 is a schematic diagram of a partial structure of a hub motor in one embodiment;

[0031] Fig.10 is a schematic diagram of a partial structure of a hub motor in one embodiment;

[0032] Fig.11 for Fig.10 A schematic diagram of a local structure of the wheel hub motor in the illustrated embodiment from another perspective;

[0033] Fig.12 for Fig.10 A schematic diagram of the structure of part B in the illustrated embodiment;

[0034] Fig.13 for Fig.11 A schematic diagram of the structure of part C in the illustrated embodiment;

[0035] Fig.14 is a schematic diagram of a partial structure of a hub motor in one embodiment;

[0036] Fig.15 for Fig.14 A schematic diagram of the structure of part D in the illustrated embodiment;

[0037] Fig.16 is a schematic diagram of a partial structure of a hub motor in one embodiment;

[0038] Fig.17 for Fig.16 A schematic diagram of the structure of part E in the illustrated embodiment;

[0039] Fig.18 is a schematic diagram of a partial structure of a hub motor in one embodiment;

[0040] Fig.19 for Fig.11 A schematic diagram of the structure of part F in the illustrated embodiment;

[0041] Fig. 20 for Fig.14 A schematic diagram of the structure of part H in the illustrated embodiment. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth so as to fully understand the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below. In the description of the utility model, it is necessary to understand that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or position relationship shown in the accompanying drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the utility model.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0047] See also Figures 1 to 5 The utility model provides a hub motor 10, which includes: a rotating component 100, a fixed component 200, a transmission component 300 and a power component 400. The rotating component 100 is rotatably connected to the fixed component 200, and the power component 400 is used to drive the rotating component 100 to rotate relative to the fixed component 200 through the transmission component 300 after the power is turned on.

[0048] The rotating assembly 100 includes a housing 110 and a bottom cover 120. The housing 110 and the bottom cover 120 together form a receiving cavity 130. The housing 110 is provided with a first tooth portion 111 at the peripheral area of ​​the top of the receiving cavity 130. The bottom cover 120 is connected and fixed to the housing 110, and the bottom cover 120 covers the opening of the housing 110.

[0049] The fixing assembly 200 includes a fixing shaft 210 and a fixing frame 220 . One end of the fixing shaft 210 passes through the bottom cover 120 and is rotatably connected to the bottom cover 120 . The fixing frame 220 is located in the accommodating cavity 130 and is fixedly connected to the fixing shaft 210 .

[0050] The transmission assembly 300 includes a transmission combination wheel 310 and a transmission shaft 320. The transmission combination wheel 310 is rotatably mounted on the fixed frame 220. The transmission combination wheel 310 has a second tooth portion 312 and a third tooth portion 313 that rotate synchronously. The second tooth portion 312 is meshed with the first tooth portion 111. The transmission shaft 320 has a fourth tooth portion 324 that is meshed with the third tooth portion 313.

[0051] The power assembly 400 includes a stator 410 and a rotor 420 . The stator 410 is fixedly connected to the fixed frame 220 . The rotor 420 is rotationally connected to the stator 410 . The transmission shaft 320 is rotationally connected to the stator 410 . The transmission shaft 320 passes through the stator 410 and is fixedly connected to the rotor 420 .

[0052] The above-mentioned hub motor 10 drives the rotor 420 to rotate by supplying power to the stator 410. The rotation process of the rotor 420 synchronously drives the transmission combination wheel 310 to rotate through the transmission shaft 320. The rotation process of the transmission combination wheel 310 synchronously drives the engine case 110 to rotate. In this way, the reduction module composed of the first tooth portion 111, the second tooth portion 312, the third tooth portion 313, and the fourth tooth portion 324 has a larger reduction ratio. When the reduction ratio is large, the influence of the fluctuation of the external load on the control of the motor will be reduced, the motor control will be better, and at the same time, the size of the hub motor can be made smaller and the weight is also smaller.

[0053] like Figures 6 to 8 As shown, in order to make the rotation process of the housing 110 more stable, in one embodiment, the housing 110 is provided with a limiting shaft 112 in the middle area of ​​the top of the accommodating cavity 130. In this embodiment, the housing 110 is integrally formed with a limiting groove 113 in the middle area of ​​the top of the accommodating cavity 130, and the limiting shaft 112 is inserted into the limiting groove 113. Preferably, the limiting shaft 112 and the limiting groove 113 are interference fit. In other embodiments, the limiting shaft 112 is formed as an integral protrusion of the housing 110 in the middle area of ​​the top of the accommodating cavity 130.

[0054] The fixing assembly 200 further includes a top plate 230 and a limit bearing 240. The top plate 230 is mounted on the top of the fixing frame 220. A limit through hole 231 is provided in the middle area of ​​the top plate 230. The outer ring of the limit bearing 240 is connected and fixed to the inner wall of the limit through hole 231. The inner ring of the limit bearing 240 is connected and fixed to the limit shaft 112. In this embodiment, the inner diameter of the inner ring of the limit bearing 240 is adapted to the outer diameter of the limit shaft 112. The limit shaft 112 is inserted into the inner ring of the limit bearing 240 and is connected and fixed to the inner ring of the limit bearing 240. Preferably, the limit shaft 112 and the inner ring of the limit bearing 240 are connected by interference fit.

[0055] In this way, during the rotation of the housing 110, the housing 110 is limitedly supported by the bottom cover 120 and the fixed shaft 210 on the one hand, and limitedly supported by the limit shaft 112 and the limit bearing 240 on the other hand, so as to avoid shaking during the rotation of the housing 110, and make the rotation process of the housing 110 more stable. At the same time, since the outer ring of the limit bearing 240 does not rotate, but only the inner ring rotates, compared with the traditional hub motor, both the inner and outer rings of the bearing at this part rotate, in this embodiment, during the rotation of the housing 110, only the inner ring rotates, and the outer ring does not rotate, so the service life of the limit bearing 240 can be greatly improved.

[0056] like Figure 3 , Figures 6 to 9 As shown, in order to improve the transmission efficiency, in one embodiment, the number of the transmission combination wheels 310 is three, and the three transmission combination wheels 310 are arranged around the transmission shaft 320. The second tooth portion 312 of each transmission combination wheel 310 is respectively meshed with the first tooth portion 111, and the third tooth portion 313 of each transmission combination wheel is respectively meshed with the fourth tooth portion 324. In this way, by the three transmission combination wheels 310 respectively meshing with the first tooth portion 111 and the fourth tooth portion 324, on the one hand, the effective meshing area between the fourth tooth portion 324 and the third tooth portion 313 of the transmission shaft 320 is increased, and on the other hand, the effective meshing area between the second tooth portion 312 and the first tooth portion 111 is also increased, thereby effectively improving the transmission efficiency.

[0057] In order to make the internal structure of the hub motor more compact and orderly, further, as Figure 7 As shown, the fixed frame 220 includes a first circular plate 221 and a second circular plate 222, the first circular plate 221 and the second circular plate 222 are coaxial and parallel, the edge of the first circular plate 221 and the edge of the second circular plate 222 are connected and fixed by a plurality of connecting columns 223, the middle area of ​​the axis of the first circular plate 221 is connected and fixed to the end of the fixed shaft 210, there is a receiving space 224 between the first circular plate 221 and the second circular plate 222, the stator 410 and the rotor 420 are located in the receiving space 224, the stator 410 is connected and fixed to the second circular plate 222, and the transmission combination wheel 310 is rotatably installed on the second circular plate 222 with its back to the stator 410. The transmission shaft 320 passes through the second circular plate 222. In this way, the first circular plate 221 and the second circular plate 222 are supported and connected by multiple connecting columns 223 to form a receiving space 224, and the stator 410 and the rotor 420 can be accommodated by the receiving space 224. The height of the receiving space 224 can be adjusted according to the volume height of the stator 410 and the rotor 420, so that the structural distribution of the fixed frame 220, the stator 410 and the rotor 420 is reasonable and orderly.

[0058] like Figure 3 As shown, after the transmission shaft 320 passes through the second circular plate 222, the transmission shaft 320 is rotatably connected to the stator 410 through the support bearing 321, that is, the support bearing 321 is provided at the axis position of the stator 410, and the transmission shaft 320 passes through the support bearing 321 and is connected to the support bearing 321, so that the transmission shaft 320 can rotate relative to the stator 410. In this way, when the rotor 420 rotates relative to the stator 410, each transmission assembly wheel 310 can be driven to rotate through the transmission shaft 320. The entire transmission structure is compact, reasonable and orderly, and the receiving space 224 of the fixed frame 220 is effectively and fully utilized, so that the overall volume of the hub motor can be made smaller.

[0059] like Figures 9 to 11 As shown, in one embodiment, the edge of the second circular plate 222 is integrally extended toward the edge of the first circular plate 221 to be provided with a wiring portion 225 and three connecting posts 223, the three connecting posts 223 are arranged at intervals, and the end of each connecting post 223 is connected and fixed to the edge of the first circular plate 221 by a screw. The wiring portion 225 is located between the two connecting posts 223, and the wiring portion 225 is used to pass the cable connected to the circuit board 411 of the stator 410. In this way, by providing the wiring portion 225, the wiring of the cable connected to the circuit board 411 of the stator 410 can be more reasonable.

[0060] In one embodiment, Figure 8 As shown, the housing 110 is integrally provided with a gear ring 116 at the peripheral area of ​​the top of the accommodating cavity 130, and the gear ring 116 protrudes from the top surface of the housing 110. A first tooth portion 111 is formed on the inner side of the gear ring 116. In order to make the gear ring 116 have a higher strength, the housing 110 is also integrally provided with a plurality of reinforcing ribs 117 on the outer side of the gear ring 116, and the plurality of reinforcing ribs 117 are evenly spaced and arranged on the outer side of the gear ring 116. Preferably, the gear ring 116 and the reinforcing ribs 117 are integrally formed. Preferably, the limiting shaft 112 is located in the central area of ​​the gear ring 116.

[0061] In one embodiment, Fig.10 As shown, the transmission assembly wheel 310 is an integrally formed assembly gear, and the transmission assembly wheel 310 includes an integrally formed lower toothed disc 311 and an upper toothed column 314, and the lower toothed disc 311 and the upper toothed column 314 are coaxially arranged. The edge of the upper toothed column 314 has a second toothed portion 312, and the edge of the lower toothed disc 311 has a third toothed portion 313. The positioning column 315 penetrates the lower toothed disc 311 and the upper toothed column 314 respectively to rotatably set the transmission assembly wheel 310 on the fixed frame 220. Specifically, the top end of the positioning column 315 is connected and fixed to the top plate 230, and the bottom end of the positioning column 315 is connected and fixed to the second circular plate 222. The transmission assembly wheel 310 is located between the top plate 230 and the second circular plate 222, and the lower toothed disc 311 and the upper toothed column 314 rotate around the positioning column 315.

[0062] like Figure 4 , Figure 5 as well as Fig. 9As shown in the figure, a small gear 322 is provided at the top of the transmission shaft 320, and the small gear 322 rotates synchronously with the transmission shaft 320. The fourth tooth portion 324 is formed at the edge of the small gear 322. In this embodiment, three transmission combination wheels 310 are arranged around the transmission shaft 320. Among them, the lower tooth disc 311 of each transmission combination wheel 310 meshes with the small gear 322, but the lower tooth discs 311 of each transmission combination wheel 310 are in complementary contact, that is, the three transmission combination wheels 310 are distributed in a "pin" shape with the small gear 322 as the axis center. In this way, during the rotation of the transmission shaft 320, the three lower tooth discs 311 are synchronously driven to rotate in the same rotation direction, such as synchronously counterclockwise rotation or synchronously clockwise rotation. Furthermore, the three upper tooth columns 314 also synchronously rotate counterclockwise or synchronously rotate clockwise, so that the three upper tooth columns 314 also synchronously mesh with the first tooth portion 111 of the gear ring 116, and the three upper tooth columns 314 jointly drive the housing 110 to rotate.

[0063] It is worth mentioning that for the reduction module composed of the first tooth portion 111, the second tooth portion 312, the third tooth portion 313, and the fourth tooth portion 324, the reduction ratio can reach 1:22. While having a large reduction ratio, the influence of the fluctuation of the external load on the motor control will be reduced, the motor control is better, and at the same time, the volume of the in-wheel motor can be made smaller and the weight is also smaller. Specifically in this embodiment, the diameter of the lower tooth disc 311 is 33.6 mm, the diameter of the upper tooth column 314 is 11.2 mm, the diameter of the gear ring 116 is 52.8 mm, and the diameter of the small gear 322 is 7.2 mm. Therefore, the reduction ratio composed of the first tooth portion 111 and the second tooth portion 312 is 4.714, that is, the diameter of the gear ring 116 divided by the diameter of the upper tooth column 314, that is, 52.8÷11.2 = 4.714. It should be noted that the reduction ratio calculation rule is that the large diameter divided by the small diameter is the reduction ratio. The reduction ratio composed of the third tooth portion 313 and the fourth tooth portion 324 is 4.667, that is, the diameter of the lower tooth disc 311 divided by the diameter of the small gear 322, that is, 33.6÷7.2 = 4.667. Therefore, the total reduction ratio of the reduction module composed of the first tooth portion 111, the second tooth portion 312, the third tooth portion 313, and the fourth tooth portion 324 is 4.714×4.667 = 22, that is, the reduction ratio can reach 1:22.

[0064] Furthermore, as Fig.10 and Fig.18As shown, in order to make the structure inside the housing 110 more compact and reasonable, the top plate 230 is a circular plate-shaped structure, and the second circular plate 222 is integrally provided with a plurality of support columns 2224 toward the top plate 230, and the top ends of the support columns 2224 are connected and fixed to the top plate 230 by screws. In this embodiment, the number of the support columns 2224 is three, and the three support columns 2224 are evenly spaced, that is, 120 degrees apart from each other, so that the support force on the top plate 230 is more balanced. The lower toothed disc 311, the upper toothed column 314, the gear ring 116 and the fine gear 322 are all located between the top plate 230 and the second circular plate 222. Further, in the vertical downward direction, the projection of the edge of the top plate 230 on the upper toothed column 314 is located within the bottom of the second tooth portion 312. That is, the edge of the top plate 230 cannot cover the second tooth portion 312 to avoid the meshing between the first tooth portion 111 and the second tooth portion 312, while the area of ​​the top plate 230 must be large enough to provide sufficient support strength for the limit bearing 240. In this way, by reasonably designing the area of ​​the top plate 230, the meshing between the first tooth portion 111 and the second tooth portion 312 is not affected, while the strength of the top plate 230 and the compactness and rationality of the structure are also considered, so that the limit bearing 240 can rotate stably after the outer ring of the limit bearing 240 is connected.

[0065] In order to make the cable connected to the circuit board 411 of the stator 410 more convenient to connect with the circuit board 411, further, the circuit board 411 of the stator 410 is installed on the side of the second circular plate 222 facing the first circular plate 221 and is completely contained in the containing space 224, and the edge of the second circular plate 222 is recessed inward at the circuit board of the stator 410 to form a wiring gap 226, and the wiring gap 226 is used to expose the interface of the circuit board 411 of the stator 410. In this embodiment, the number of wiring gaps 226 is two, and the two wiring gaps 226 are respectively located on both sides of the wiring portion 225, and each wiring gap 226 corresponds to an interface of the circuit board 411 of the stator 410. In this way, the interface of the circuit board 411 of the stator 410 is exposed through the wiring gap 226, and the cable can be connected to the interface of the circuit board more conveniently and quickly.

[0066] like Figures 10 to 13As shown, in one embodiment, the wiring portion 225 includes a first arc plate 2251 and a second arc plate 2252, the first arc plate 2251 and the second arc plate 2252 are arranged at intervals, and there is a threading gap 2253 between the first arc plate 2251 and the second arc plate 2252, and the opening of the threading gap 2253 is adjacent to the wiring notch 226. Preferably, the first arc plate 2251 and the second arc plate 2252 are respectively formed in one piece with the second circular plate 222 facing the first circular plate 221. In this way, when the cable enters the threading gap 2253, it can be connected to the interface of the circuit board 411 through the two openings on both sides of the threading gap 2253, respectively, so that the cable can be arranged reasonably and orderly inside the hub motor.

[0067] In order to facilitate the cable to enter the threading gap 2253, as shown in FIG. Fig.14 and Fig.15 As shown, the ends of the first arc plate 2251 and the second arc plate 2252 both abut against the edge of the first circular plate 221. Furthermore, a clearance notch 2211 is provided on the edge of the first circular plate 221 at the abutment of the first arc plate 2251, and the clearance notch 2211 is connected to the threading gap 2253. Preferably, the edge of the first circular plate 221 is recessed at the abutment of the first arc plate 2251 to form the clearance notch 2211. Preferably, the clearance notch 2211 is an arc-shaped structure to facilitate the threading of the wiring harness. In this way, when the cable 500 comes out of the bottom cover 120, it can enter the threading gap 2253 through the clearance notch 2211, and then enter the interface of the circuit board 411 through the threading gap 2253.

[0068] like Figures 14 to 17 As shown, further, the fixed shaft 210 is hollow, and a through hole 211 is provided at the connection between the fixed shaft 210 and the bottom cover 120. The through hole 211 corresponds to the clearance notch 2211. The hollow fixed shaft 210 can facilitate the insertion of the cable 500. When the top end of the cable 500 reaches the through hole 211, it can pass through the through hole 211 and further pass through the clearance notch 2211 into the threading gap 2253, so that the cable 500 can correspond to the interface of the circuit board 411 from the two openings on both sides of the threading gap 2253.

[0069] In order to ensure that the connection between the first circular plate 221 and the second circular plate 222 is stable and firm, as shown in FIG. Fig.19 and Fig. 20As shown, the edge of the second circular plate 222 is integrally formed with the connecting column 223 toward the edge of the first circular plate 221, and the end of the connecting column 223 is connected and fixed to the edge of the first circular plate 221 by screws. Furthermore, a limiting arc plate 2231 is protruded from the outer side of the end of the connecting column 223, and the inner side wall of the limiting arc plate 2231 abuts against the outer side wall of the edge of the first circular plate 221. In other words, the end of the connecting column 223 is a step structure by protruding from the outer side of the end of the connecting column 223 to provide the limiting arc plate 2231. In this embodiment, the end of each connecting column 223 is provided with a limiting arc plate 2231, and each limiting arc plate 2231 limits the first circular plate 221 together. In this way, under the action of the limiting arc plate 2231, the end of the connecting column 223 is a step structure, and after being connected and fixed to the edge of the first circular plate 221 by screws, the connection between the second circular plate 222 and the first circular plate 221 is stable and firm, ensuring that the internal structure of the hub motor remains stable during operation, so that the hub motor can work more smoothly and stably.

[0070] It is worth mentioning that the utility model also provides a lawn mowing device, which includes a main body, a tire, and a hub motor as in any of the above embodiments, the fixed shaft of the hub motor is connected and fixed to the main body, and the tire is mounted on the housing of the hub motor. The lawn mowing device can reach a hub motor with a reduction ratio of 1:22. Compared with the traditional lawn mower, the lawn mowing device of the utility model is lighter and smaller in size when the output performance is the same after the motor is decelerated. In other words, the weight of the motor of the traditional lawn mower before deceleration is greater than that of the utility model. The reason is that in the field of use of lawn mowers, the motor with low speed and large torque before deceleration requires a larger volume than the motor with high speed and small torque, and the larger volume will also be heavier.

[0071] Of course, although a lawn mowing device is provided in one embodiment of the utility model, since the application scope of the wheel hub motor is relatively wide, the lawn mowing device provided by the utility model only provides an embodiment of the application of the wheel hub motor in the lawn mowing device. The wheel hub motor can also be used in other fields that require walking, such as underwater cleaning robots, sweeping robots, etc. Therefore, as long as the device includes the wheel hub motor in any of the above embodiments, it is within the protection scope of the utility model.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A hub motor, comprising: A rotating assembly, a fixed assembly, a transmission assembly and a power assembly, wherein the rotating assembly is rotatably connected to the fixed assembly, and the power assembly is used to drive the rotating assembly to rotate relative to the fixed assembly through the transmission assembly after power is turned on, characterized in that: The rotating assembly includes a housing and a bottom cover, wherein the housing and the bottom cover together form a receiving cavity, and the housing is provided with a first tooth portion at a peripheral area of ​​the top of the receiving cavity; the bottom cover is connected and fixed to the housing, and the bottom cover is provided to cover the opening of the housing; The fixing assembly includes a fixing shaft and a fixing frame, one end of the fixing shaft passes through the bottom cover and is rotatably connected to the bottom cover, and the fixing frame is located in the accommodating cavity and is fixedly connected to the fixing shaft; The transmission assembly comprises a transmission combination wheel and a transmission shaft, wherein the transmission combination wheel is rotatably mounted on the fixed frame, the transmission combination wheel has a second tooth portion and a third tooth portion that rotate synchronously, the second tooth portion meshes with the first tooth portion, and the transmission shaft has a fourth tooth portion that meshes with the third tooth portion; The power assembly includes a stator and a rotor, the stator is connected and fixed to the fixed frame, the rotor is rotatably connected to the stator, the transmission shaft is rotatably connected to the stator, and the transmission shaft passes through the stator and is connected and fixed to the rotor.

2. The wheel hub motor according to claim 1, characterized in that: The housing is provided with a limiting axis in the middle area of ​​the top of the accommodating cavity; The fixing assembly also includes a top plate and a limit bearing. The top plate is installed on the top of the fixing frame. A limit through hole is opened in the middle area of ​​the top plate. The outer ring of the limit bearing is connected and fixed to the inner wall of the limit through hole, and the inner ring of the limit bearing is connected and fixed to the limit shaft.

3. The wheel hub motor according to claim 1, characterized in that: There are three transmission combination wheels, which are arranged around the transmission shaft. The second tooth portion of each transmission combination wheel is respectively meshed with the first tooth portion, and the third tooth portion of each transmission combination wheel is respectively meshed with the fourth tooth portion.

4. The wheel hub motor according to claim 1, characterized in that: The fixed frame includes a first circular plate and a second circular plate that are coaxially and parallelly arranged, the edge of the first circular plate and the edge of the second circular plate are connected and fixed by a plurality of connecting columns, the middle area of ​​the axis of the first circular plate is connected and fixed to the end of the fixed shaft, a receiving space is provided between the first circular plate and the second circular plate, the stator and the rotor are located in the receiving space, the stator is connected and fixed to the second circular plate, the transmission combination wheel is rotatably installed on the second circular plate with its back facing the stator, and the transmission shaft passes through the second circular plate.

5. The wheel hub motor according to claim 4, characterized in that: The edge of the second circular plate is integrally extended toward the edge of the first circular plate to be provided with a wiring portion and three connecting columns, the three connecting columns are arranged at intervals, and the end of each connecting column is connected and fixed to the edge of the first circular plate by a screw, and the wiring portion is located between two of the connecting columns, and the wiring portion is used to pass a cable connected to a circuit board of the stator.

6. The wheel hub motor according to claim 5, characterized in that: The circuit board of the stator is mounted on a side of the second circular plate facing the first circular plate and is completely accommodated in the accommodation space. The edge of the second circular plate is recessed inward at the circuit board of the stator to form a wiring gap, and the wiring gap is used to expose the interface of the circuit board of the stator.

7. The wheel hub motor according to claim 6, characterized in that: The wiring portion includes a first arc plate and a second arc plate, the first arc plate and the second arc plate are arranged at an interval, a threading gap is provided between the first arc plate and the second arc plate, and an opening of the threading gap is adjacent to the wiring notch.

8. The wheel hub motor according to claim 7, characterized in that: The ends of the first arc plate and the second arc plate both abut against the edge of the first circular plate.

9. The wheel hub motor according to claim 8, characterized in that: A clearance gap is formed at the edge of the first circular plate at the abutment position of the first arc plate, and the clearance gap is communicated with the threading gap.

10. A lawn mowing device, characterized in that: The mowing equipment comprises a main body, a tire and a hub motor as claimed in any one of claims 1 to 9, wherein a fixed shaft of the hub motor is connected and fixed to the main body, and the tire is sleeved on a housing of the hub motor.

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