A domestic lawnmower drive hub motor

Abstract

The application discloses a household mower driving wheel hub motor and relates to the technical field of motors.The flange plate front cover and the flange plate rear cover are fixedly formed into an integral whole by carbon steel screws, an output assembly is arranged in the flange plate rear cover, a motor driving source is formed by a motor outer stator and a motor inner rotor, a sun gear and a planetary gear arranged in the flange plate rear cover are used to provide a speed reducer mechanism for the driving wheel hub motor, and a cold supply assembly and a cold guide assembly are arranged in the flange plate front cover and the flange plate rear cover respectively.Based on the high-speed rotation and low-speed revolution mechanism formed by the sun gear, the planetary gear and the fixed gear ring, the application adopts a two-in-one shared combination of a driving motor and a speed reducer motor, realizes the self-adaptive planetary speed reduction effect under the driving of the wheel hub motor, meets the low-rotation speed and large-torque actual scene driving demand of the wheel hub motor on the walking wheel of the household mower, greatly reduces the occupied space of the walking wheel area and reduces the overall weight burden.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a hub motor for driving a household lawnmower. Background Technology

[0002] Hub motor technology, also known as in-wheel motor technology, is characterized by integrating the power unit, transmission unit, and braking unit into the wheel hub, which greatly simplifies the mechanical parts of electric vehicles. Hub motor drive systems are mainly divided into two structural types according to the rotor type of the motor: internal rotor type and external rotor type. According to the drive requirements of the wheels of household lawnmowers, internal rotor type hub motors are commonly used.

[0003] Based on the actual usage scenarios of household lawnmowers, hub motors are required to control the walking wheels for real-time driving at low speeds and high torque. To meet this requirement, planetary reducers are usually added to the hub motors to adapt to the needs of the scenario. However, adding planetary reducers not only greatly occupies the space occupied by the hub motor in the walking wheel area, but also increases the assembly weight of the walking wheels and increases the walking burden on the walking wheels, which is not worth the effort. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing hub motors for driving household lawnmowers, the present invention is proposed.

[0006] Therefore, the problem to be solved by this invention is how to solve the problem of narrow space and heavy counterweight caused by the additional installation of planetary reducers on the wheels of a household lawnmower driven by a hub motor.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hub motor for a household lawnmower, comprising a front flange cover and a rear flange cover fixed together by carbon steel screws, an output component is provided inside the rear flange cover, a motor drive source is formed by an external stator and an internal rotor, and a sun gear and planetary gears provided inside the rear flange cover provide a reduction mechanism for the hub motor, and a cooling component and a cooling guide component respectively provided inside the front flange cover and the rear flange cover, respectively, circulate coolant into a liquid collection ring frame with a circulation channel through an injection head and a circulation head to provide cooling conditions for the hub motor, and a sealing component applies a sealing measure between the front flange cover and the external wheels of the household lawnmower.

[0008] As a preferred embodiment of the hub motor for driving a household lawnmower according to the present invention, the output component further includes a sun gear transversely placed inside the rotor of the motor, and a planetary support is provided on the side of the flange back cover near the outer stator of the motor; a planetary shaft is transversely placed in a triangular equidistant shape on the planetary support, and a planetary gear meshing with the sun gear is sleeved on the planetary shaft; a fixed gear ring meshing with the planetary gear is provided on the inner circumference of the flange front cover.

[0009] As a preferred embodiment of the hub motor for driving a household lawnmower according to the present invention, wherein: an output bracket is provided at the outer end of the flange front cover to match the planetary bracket, and a magnetic braiding plate is provided on the outer side of the output bracket, and a flange wire is horizontally placed on the output bracket; the flange wire passes through to the outer side of the output bracket and is plugged into one of an external switch Hall / linear Hall / magnetic encoder, and a nitrile rubber ring is provided between the flange front cover and the flange rear cover, and a nitrile rubber plug is fitted on the flange wire.

[0010] As a preferred embodiment of the hub motor for driving a household lawnmower according to the present invention, the sun gear and planetary gears are each fitted with deep groove ball bearings, and countersunk screws are threadedly connected between the planetary support and the output support; a positioning pin is inserted into the outer side of the output support in a triangular equidistant shape, the positioning pin is positioned and inserted into the external household lawnmower wheel, and the outer side of the output support has connecting screw holes that are staggered with the positioning pin, and is fixed to the external household lawnmower wheel by external connecting screws.

[0011] As a preferred embodiment of the hub motor for driving a household lawnmower according to the present invention, the cooling assembly further includes an embedded flow sensor head embedded in the injection head, and the outer end of the injection head is connected to a filling head, which is connected to a filling pipeline with an external circulation pump.

[0012] As a preferred embodiment of the drive hub motor for the household lawnmower described in this invention, the liquid filling head is equipped with an embedded micro pressure regulating valve; and a butt joint is fixed on the inner circumference of the liquid collecting ring frame, and a mating seat is fixed on the outer circumference of the flange front cover. The butt joint and the mating seat are connected one by one by interference fit.

[0013] As a preferred embodiment of the hub motor for driving a household lawnmower according to the present invention, the circulation head is provided with an embedded micro drain valve, and the outer end of the circulation head is connected to a drain head. The drain head is connected to a drain pipe with an external circulation pump. The external liquid supply pipe and the external drain pipe form a complete coolant circulation supply and discharge pipe through the external circulation pump.

[0014] As a preferred embodiment of the drive hub motor for the household lawnmower described in this invention, an embedded temperature sensor is embedded on the inner side of the liquid collection ring frame near the injection head and the circulation head. The injection head and the circulation head are connected to the circulation channel, and the detection probe of the embedded temperature sensor extends through the circulation channel.

[0015] As a preferred embodiment of the drive hub motor for the household lawnmower described in this invention, the cold guiding assembly further includes a convex guide head circumferentially connected to the inner end of the liquid collection ring frame, and the convex guide head is connected to the circulation channel, and a fine mesh is embedded in the inner end of the convex guide head; the outer circumference of the flange front cover is provided with a concave guide groove that mates with the convex guide head, and the inner circumference of the flange front cover is provided with a guide port that communicates with the concave guide groove, and a flow equalization block is embedded in the guide port.

[0016] As a preferred embodiment of the drive hub motor for the household lawnmower described in this invention, the inner ring of the flange front cover is provided with a buffer ring frame, and the outer circumference of the buffer ring frame is provided with a cooling port communicating with the guide port; the buffer ring frame is provided with cooling fins, the two rows of cooling fins are distributed in a circumferentially staggered manner along the central axis of the buffer ring frame, and the outer side of the buffer ring frame is provided with a cooling groove, and a cooling ring is embedded in the cooling groove.

[0017] The beneficial effects of this invention are as follows: Based on the high-speed rotation and slow revolution mechanism formed by the sun gear, planetary gears, and fixed gear ring, a shared combination of drive motor and geared motor is adopted to achieve an adaptive planetary reduction effect under the drive of the hub motor. This not only meets the actual driving requirements of the hub motor for the low speed and high torque of the walking wheels of a household lawnmower, but also greatly reduces the space occupied by the walking wheel area, reduces the overall weight burden, and simultaneously applies overheat protection measures to the hub motor based on the coolant circulation supply and drainage mechanism, using a combination of flow-type heat dissipation and comprehensive conduction cooling, thus extending the service life of the hub motor. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. 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.

[0019] Figure 1 A front view of the hub motor that drives a household lawnmower.

[0020] Figure 2 An exploded view of the hub motor driving a household lawnmower.

[0021] Figure 3 This is a partial exploded view of the hub motor that drives a household lawnmower.

[0022] Figure 4 An exploded view of the output components of the hub motor that drives a household lawnmower.

[0023] Figure 5 Exploded view of the flange front cover and liquid collection ring frame of the hub motor driving a household lawnmower.

[0024] Figure 6 Exploded cross-sectional view of the flange front cover and cold conductor assembly of the hub motor driving a household lawnmower.

[0025] Figure 7 Exploded cross-sectional view of the flange front cover and cooling assembly of the hub motor driving a household lawnmower.

[0026] Figure 8 Exploded cross-sectional view of the sealing assembly of the hub motor driving a household lawnmower.

[0027] In the diagram: 1. Front flange cover; 2. Rear flange cover; 3. Carbon steel screw; 41. Motor outer stator; 42. Motor inner rotor; 43. Sun gear; 44. Planetary support; 45. Planetary shaft; 46. Planetary gear; 47. Stator gear ring; 48. Output bracket; 5. Nitrile rubber ring; 6. Magnetic braided plate; 7. Flange wire; 8. Nitrile rubber plug; 9. Deep groove ball bearing; 10. Countersunk screw; 11. Locating pin; 121. Liquid collecting ring frame; 122. Injection head; 123. Embedded flow sensor head; 124. Injection head; 125. Embedded miniature pressure regulating valve; 126. 127. Circulation head; 128. Embedded miniature drain valve; 13. Drain head; 14. Connector; 15. Connecting seat; 161. Embedded temperature sensor head; 162. Circulation channel; 163. Convex guide head; 164. Concave guide groove; 165. Flow guide port; 166. Buffer ring frame; 167. Cooling fins; 168. Cooling port; 17. Cooling ring; 18. Fine mesh; 19. Flow equalization block; 201. Cooling groove; 202. Oil seal skeleton; 203. Double-layer sealing cavity; 204. Outer elastic ring; 205. Inner elastic ring; 206. Outer protective ring; 207. Inner protective ring. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0031] Example 1, referring to Figures 1 to 8 This is the first embodiment of the present invention, which provides a hub motor for driving a household lawnmower. It includes a front flange cover 1 and a rear flange cover 2, which are fixed together by carbon steel screws 3. An output component is provided in the rear flange cover 2. The motor drive source is formed by the outer stator 41 and the inner rotor 42 of the motor. The sun gear 43 and planetary gears 46 provided in the rear flange cover 2 provide a speed reduction mechanism for driving the hub motor. The shared combination of the drive motor and the geared motor achieves an adaptive planetary speed reduction effect under the drive of the hub motor. It is suitable for actual scenarios where the hub motor drives the wheels of a household lawnmower at low speed and high torque.

[0032] Specifically, it also includes a sun gear 43 horizontally placed inside the inner rotor 42 of the motor, and a planetary support 44 is provided on the side of the flange plate rear cover 2 near the outer stator 41 of the motor. Planetary shafts 45 are horizontally placed in a triangular equidistant shape on the planetary support 44, and planetary gears 46 that mesh with the sun gear 43 are sleeved on the planetary shafts 45. A fixed gear ring 47 that meshes with the planetary gears 46 is provided on the inner circumference of the flange plate front cover 1, and an output support 48 that matches the planetary support 44 is provided at the outer end of the flange plate front cover 1.

[0033] The sun gear 43, planet gear 46 and fixed gear ring 47 are all equipped with helical gear meshing, which improves the overlap of meshing between the sun gear 43, planet gear 46 and fixed gear ring 47, and further enhances the transmission stability and efficiency of the sun gear 43, planet gear 46 and fixed gear ring 47, which is conducive to the powerful output of driving force.

[0034] In use, the outer stator 41 of the motor drives the sun gear 43 to rotate at high speed through the inner rotor 42 of the motor, providing a high-speed drive source. The high-speed rotating sun gear 43 drives the planet gears 46, which are distributed in a triangular equidistant shape, to rotate at high speed around the three planetary shafts 45. Since the fixed gear ring 47 is locked inside the flange front cover 1 and is in a fixed state, the three sets of planet gears 46 are forced to roll around the inner side of the fixed gear ring 47 while rotating at high speed, which in turn drives the planetary support 44 that carries the three sets of planet gears 46 to rotate slowly.

[0035] Although the sun gear 43 is driven by the magnetic field of the outer stator 41 and the inner rotor 42 of the motor and rotates at a high speed, the three sets of planetary gears 46 surround the fixed gear ring 47 and synchronously drive the planetary support 44 to rotate at a speed much lower than that of the sun gear 43, thus achieving speed reduction. At the same time, the torque is amplified. The planetary support 44, which rotates at a low speed, transmits the reduced speed and amplified torque through the locked output support 48, and then drives the wheels of the household lawnmower, meeting the low speed and high torque requirements of the wheels of the household lawnmower.

[0036] Specifically, a magnetic encoder plate 6 is provided on the outer side of the output bracket 48, and a flange plate wire 7 is horizontally placed on the output bracket 48. The flange plate wire 7 passes through the outer side of the output bracket 48 and is connected to one of the external switch Hall / linear Hall / magnetic encoder. The signal is controlled by an external motor controller installed on a household lawnmower.

[0037] Specifically as follows:

[0038] The rotor 42 of the motor with its own magnet rotates → monitoring changes in the magnetic field → the sensor built into the magnetic encoder 6 collects the data → converts it into an electrical signal → the flange wire 7 transmits the signal outward → external switch Hall / linear Hall / magnetic encoder → external motor controller receives the signal and performs corresponding control.

[0039] The motor controller obtains the rotor position.

[0040] ① Control the commutation of the winding current of the outer stator 41 of the motor to allow the hub motor to rotate continuously.

[0041] ② Calculate the rotational speed of the inner rotor 42 of the motor. Use the rotational speed of the inner rotor 42 of the motor acquired by one of the external switch Hall / linear Hall / magnetic encoder as the feedback quantity to form a speed closed loop.

[0042] ③ The actual turning angle of the wheels of the household lawnmower is calculated based on the reduction ratio for the lawnmower's built-in navigation and positioning. This is a mature technology and will not be elaborated here.

[0043] The magnetic field detection is non-contact, without mechanical friction, extending its lifespan and adapting to the dusty and humid outdoor working conditions of lawnmowers; the magnetic encoder measures the high-speed rotor of the motor, and the actual output position of the walking wheel = magnetic encoder reading angle ÷ planetary reduction ratio.

[0044] By relying on the power output of the drive motor → speed reduction and torque increase of the first-stage helical planetary reducer → output bracket 48 output torque, combined with magnetic encoder / Hall detection of speed position, the adaptive planetary reduction effect under the drive of the hub motor is realized. It not only meets the actual driving needs of the hub motor for the low speed and high torque of the walking wheels of the household lawnmower, but also has a small shape and compact structure layout, which greatly reduces the space occupied by the walking wheel area and reduces the overall weight burden.

[0045] Furthermore, a nitrile rubber ring 5 is provided between the front cover 1 and the rear cover 2 of the flange plate. The nitrile rubber ring 5 enhances the sealing performance at the connection between the front cover 1 and the rear cover 2 of the flange plate, forming an integral end cover shared by the drive motor and planetary reducer. A nitrile rubber plug 8 is fitted on the flange plate wire 7. The nitrile rubber plug 8 provides flexible limiting protection for the flange plate wire 7, preventing it from shaking and breaking under force, which would lead to poor contact and improve the signal transmission quality of the flange plate wire 7.

[0046] Specifically, both the sun gear 43 and the planet gear 46 are fitted with deep groove ball bearings 9. The deep groove ball bearings 9 improve the rotational stability and smoothness of the sun gear 43 and the planet gear 46. The planet carrier 44 and the output carrier 48 are connected by countersunk screws 10. The countersunk screws 10 ensure a complete connection between the planet carrier 44 and the output carrier 48, preventing large gaps from being exposed and affecting power output.

[0047] The outer side of the output bracket 48 is fitted with equidistant triangular positioning pins 11. The positioning pins 11 are positioned and inserted into the external wheels of the household lawnmower. The outer side of the output bracket 48 is provided with connecting screw holes that are staggered with the positioning pins 11. The external connecting screws are used to fix the output bracket 48 to the external wheels of the household lawnmower. The positioning pins 11 and the external connecting screws in the connecting screw holes improve the locking stability between the output bracket 48 and the external wheels of the household lawnmower, which is conducive to the output bracket 48 providing stable power output to the external wheels of the household lawnmower at low speed and high torque.

[0048] Example 2, refer to Figures 1 to 8 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0049] The cooling components and cooling guide components, respectively installed in the front cover 1 and rear cover 2 of the flange plate, circulate coolant into the liquid collection ring frame 121 with circulation channel 161 through the injection head 122 and circulation head 126, providing cooling conditions for the drive hub motor, avoiding overheating caused by the hub motor driving the wheels of the household lawnmower for a long time, applying overheat protection measures, reducing the frequency of hub motor damage, and improving the continuous power output performance of the hub motor. Depending on the actual working conditions on site, the coolant can also be replaced with cooling oil.

[0050] Specifically, it also includes an embedded flow sensor 123 embedded in the injection head 122. The embedded flow sensor 123 is used to quantitatively process the coolant flowing into the circulation channel 161. The outer end of the injection head 122 is connected to a filling head 124, which is connected to a filling pipeline with an external circulation pump. The external circulation pump at the external filling pipeline supplies coolant to the circulation channel 161 in the liquid collection ring frame 121 through the injection head 122.

[0051] The filling head 124 is equipped with an embedded micro pressure regulating valve 125. The pressure of the coolant flowing into the filling head 124 is adaptively controlled by the embedded micro pressure regulating valve 125 to ensure the fluidity of the coolant in the circulation channel 161. This forces the coolant supplied into the circulation channel 161 to diffuse and flow, thus fully covering the heat generated by the drive motor and planetary reducer in the front cover 1 and rear cover 2 of the flange plate, achieving a comprehensive heat dissipation effect.

[0052] Furthermore, a butt joint 13 is fixed on the inner circumference of the liquid collecting ring frame 121, and a mating seat 14 is fixed on the outer circumference of the flange plate front cover 1. The butt joint 13 and the mating seat 14 are connected one by one by an interference fit. Through the butt joint 13 and the mating seat 14 connected one by one by an interference fit, the flange plate front cover 1 and the liquid collecting ring frame 121 are connected in place to form a whole.

[0053] Specifically, it also includes an embedded miniature drain valve 127 embedded in the circulation head 126, and a drain head 128 connected to the outer end of the circulation head 126. The drain head 128 is connected to a drain pipe with an external circulation pump. The external circulation pump circulates the overheated coolant in the circulation channel 161 back to the drain head 128, and then circulates it back through the external drain pipe.

[0054] After that, the embedded micro drain valve 127 is opened, and the new coolant in the external liquid filling pipeline is refilled into the circulation channel 161 through the liquid filling head 124, so as to achieve the effect of supplying and draining the overheated and new coolant in the circulation channel 161, and achieve the purpose of cooling the heat carried by circulation.

[0055] The external coolant supply line and the external coolant discharge line form a complete coolant circulation supply and discharge line through the external circulation pump, ensuring the integrity and smooth flow of the overheating and new coolant circulation line. This provides comprehensive heat dissipation and cooling for the heat generated by the drive motor and planetary reducer inside the flange front cover 1 and flange rear cover 2, ensuring the overall operating performance of the hub motor.

[0056] Furthermore, the external liquid supply line and the external liquid discharge line form a complete coolant circulation supply and discharge line through the external circulation pump. The front cover 1 of the flange plate and the rear cover 2 of the flange plate, as well as the drive motor and planetary reducer components inside, all move with the household lawnmower without dragging the pipeline, thus avoiding dragging and tangling of the external pipeline. At the same time, the external storage tank that supplies coolant to the external pipeline is also installed on the household lawnmower.

[0057] An embedded temperature sensor 15 is embedded in the inner side of the liquid collection ring 121 near the injection head 122 and the circulation head 126. The injection head 122 and the circulation head 126 are connected to the circulation channel 161, and the detection probe of the embedded temperature sensor 15 extends into the circulation channel 161. The temperature of the coolant in the circulation channel 161 is monitored in real time through the embedded temperature sensor 15 and is adaptively controlled by the PLC control panel connected to the home lawnmower.

[0058] During use, if the embedded temperature sensor 15 detects that the coolant circulating in the circulation channel 161 carries too much heat and overheats, it means that the coolant has lost its cooling effect on the front cover 1 and rear cover 2 of the flange plate. At this time, the external PLC control panel controls the embedded micro drain valve 127 to open, and the overheated coolant in the circulation channel 161 is pumped back to the external drain pipeline by the external circulation pump through the circulation head 126 and the drain head 128.

[0059] Meanwhile, the external PLC control panel controls the flow of new coolant injected into the circulation channel 161 via the embedded micro pressure regulating valve 125 to reduce the flow rate. The external circulation pump slowly injects new coolant from the external filling pipeline into the circulation channel 161 via the filling head 124 and the filling head 122. The newly injected coolant flows slowly while impacting the overheated coolant, which quickly flows back to the external drain pipeline through the drain head 128. This completes the circulation and drainage of overheated and new coolant. This process is repeated to circulate and drain coolant into the circulation channel 161, forcing the coolant to always maintain an effective heat-carrying and cooling state.

[0060] Once the new coolant supplied to the circulation channel 161 fills the original flow channel of the superheated coolant, and the coolant in the circulation channel 161 reaches the preset cooling temperature threshold of the embedded temperature sensor head 15, the PLC control panel controls the embedded micro pressure regulating valve 125 to increase the flow pressure of the coolant, forcing the new coolant to circulate quickly and comprehensively, replacing the old with the new, and forcing the coolant to carry heat and cool it, thus cooling the heat generated in the flange front cover 1 and flange rear cover 2 throughout the process.

[0061] Specifically, it also includes a convex guide head 162 that is circumferentially connected to the inner end of the liquid collecting ring frame 121, and the convex guide head 162 is connected to the circulation channel 161. A fine mesh 17 is embedded in the inner end of the convex guide head 162. Through the fine mesh 17, impurities in the coolant supplied to the circulation channel 161 by pressure regulation are filtered and intercepted to avoid impurities from clogging the pipe and to ensure the circulation flow of the coolant.

[0062] The outer circumference of the flange front cover 1 is provided with a concave guide groove 163 that mates with the convex guide head 162. The connection between the convex guide head 162 and the concave guide groove 163 is sealed with a waterproof gasket to prevent coolant leakage under the vibration force generated by the hub motor. Through the convex guide head 162 and the concave guide groove 163, the coolant supplied to the circulation channel 161 is supplied from the convex guide head 162 to the concave guide groove 163, completing the partitioned diffusion flow of coolant in the circulation channel 161.

[0063] Furthermore, the inner circumference of the flange front cover 1 is provided with a guide port 164 communicating with the concave guide groove 163, and a flow equalization block 18 is embedded in the guide port 164. The inner circumference of the flange front cover 1 is also provided with a buffer ring frame 165, and the outer circumference of the buffer ring frame 165 is provided with a cooling port 167 communicating with the guide port 164. The coolant that reaches the concave guide groove 163 diffuses and flows into the buffer ring frame 165 through the corresponding guide ports 164 and cooling ports 167. The flow equalization block 18 performs flow equalization and pressure relief treatment on the coolant that flows into the cooling port 167 through the guide port 164 to avoid turbulence.

[0064] Specifically, the buffer ring frame 165 is embedded with cooling fins 166. Two rows of cooling fins 166 are distributed in a staggered circular pattern along the central axis of the buffer ring frame 165. The cooling fins 166 distributed in a staggered circular pattern conduct the coolant supplied into the buffer ring frame 165 to extend the cooling time of the coolant, reduce the frequency of circulation and replacement of the overheated coolant, and continuously carry and cool the heat generated by the operation of the drive motor + planetary reducer in the front cover 1 and rear cover 2 of the flange plate.

[0065] Furthermore, a cooling channel 19 is provided on the outer side of the buffer ring frame 165, and a cooling ring 168 is embedded in the cooling channel 19. The coolant reaching the buffer ring frame 165 is further cooled by the cooling fins 166. Based on the principle of cold conduction, the cold source generated by the coolant is diffused in all directions from the buffer ring frame 165 as the base point through the cooling ring 168 in the cooling channel 19, and the heat generated in the front cover 1 and rear cover 2 of the flange plate is carried away and cooled.

[0066] When using, such as Figure 5 As shown, the coolant, which is circulated into the circulation channel 161 and kept in a cooled state, flows through the convex guide head 162 and concave guide groove 163, through the guide port 164 and the cooling port 167, and then reaches the buffer ring frame 165. The cooling fins 166 then perform cooling treatment on the coolant circulating into the buffer ring frame 165.

[0067] Based on the principle of cold conduction, the cold source generated by the coolant after the cold conduction enhancement in the buffer ring frame 165 passes through the cold conduction ring 168 in the cold conduction groove 19 and is subjected to comprehensive heat-carrying cooling treatment on both sides with the buffer ring frame 165 as the base point. Meanwhile, the cold source generated by the coolant circulating in the buffer ring frame 165 is also diffused outwards in a synchronized manner. Subsequently, the heat generated by the operation of the drive motor + planetary reducer in the front cover 1 and rear cover 2 of the flange plate is continuously and comprehensively cooled.

[0068] Example 3, referring to Figures 1 to 8 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0069] A sealing component is used to apply a sealing measure between the flange front cover 1 and the external household lawnmower wheels. The sealing component includes an oil seal skeleton 201 embedded between the flange front cover 1 and the output bracket 48. The oil seal skeleton 201 seals the flange front cover 1, the output bracket 48 and the external household lawnmower wheels, preventing oil and liquid leakage.

[0070] Furthermore, an annular cooling gap is reserved between the oil seal skeleton 201 and the buffer ring frame 165. The coolant generated by the coolant in the buffer ring frame 165 is conducted and diffused to the inner end area of ​​the oil seal skeleton 201 through the reserved annular cooling gap via the cooling ring 168. This provides heat-carrying cooling for the oil seal skeleton 201 under friction conditions, protects the oil seal skeleton 201 from friction overheating, and extends the sealing life of the oil seal skeleton 201.

[0071] Specifically, the oil seal skeleton 201 adopts a double-layer sealing cavity 202 design. By adopting the double-layer sealing cavity 202 design, the sealing strength of the oil seal skeleton 201 is enhanced, and the sealing area of ​​the oil seal skeleton 201 is expanded, making the sealing more effective and comprehensive.

[0072] An outer elastic ring 203 is fitted inside the outer sealing cavity, and an inner elastic ring 204 is fitted inside the inner sealing cavity. Through the outer elastic ring 203 and the inner elastic ring 204, the oil seal skeleton 201, which adopts the design of inner and outer double sealing cavities 202, plays a double elastic restraint role, forcing the oil seal skeleton 201 to always maintain a sealed and close fit with the output bracket 48.

[0073] Specifically, the outer end of the oil seal skeleton 201 is fastened with an outer retaining ring 205. The outer retaining ring 205 adopts a thin design. By adopting the thin design of the outer retaining ring 205, the support strength of the outer end of the oil seal skeleton 201 can be enhanced to prevent the outer end of the oil seal skeleton 201 from deforming under pressure and causing oil leakage.

[0074] The cold source generated by the coolant in the circulation channel 161 of the liquid collecting ring 121 can also be directly conducted to the outer protective ring 205 area, and then further conducted to the outer end area of ​​the oil seal skeleton 201. With the help of the cooling ring 168 and the annular cooling gap, the oil seal skeleton 201 can achieve dual overheat protection measures inside and outside.

[0075] An inner retaining ring 206 is fastened to the inner end of the oil seal skeleton 201. The inner retaining ring 206 adopts a thin design. By adopting the thin design of the inner retaining ring 206, the support strength of the inner end of the oil seal skeleton 201 is enhanced, so as to prevent the inner end of the oil seal skeleton 201 from deforming under pressure and causing oil leakage. Together with the outer retaining ring 205, it provides stable support for the inner and outer end areas of the oil seal skeleton 201 to prevent deformation under pressure and provide rigid support protection for the oil seal skeleton 201.

[0076] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hub motor for driving a household lawnmower, characterized in that: The system includes a flange front cover (1) and a flange rear cover (2) that are fixed together by carbon steel screws (3). An output component is provided in the flange rear cover (2). The motor drive source is formed by the motor outer stator (41) and the motor inner rotor (42). The sun gear (43) and planet gear (46) provided in the flange rear cover (2) provide a speed reduction mechanism for the drive hub motor. Cooling components and cooling guide components are respectively provided in the flange front cover (1) and the flange rear cover (2). Cooling liquid is circulated into the liquid collection ring frame (121) with a circulation channel (161) through the liquid injection head (122) and the circulation head (126) to provide cooling conditions for the drive hub motor. A sealing component is used to apply a sealing measure between the flange front cover (1) and the external household lawnmower wheel.

2. The hub motor for driving a household lawnmower as described in claim 1, characterized in that: The output assembly also includes a sun gear (43) that is horizontally placed inside the inner rotor (42) of the motor, and a planetary support (44) is provided on the side of the flange back cover (2) near the outer stator (41) of the motor. The planetary support (44) has a planetary shaft (45) arranged horizontally in a triangular equidistant shape, and a planetary gear (46) that meshes with the sun gear (43) is fitted on the planetary shaft (45). A fixed gear ring (47) that meshes with the planetary gear (46) is provided on the inner circumference of the flange front cover (1).

3. The hub motor for driving a household lawnmower as described in claim 1, characterized in that: The outer end of the flange front cover (1) is provided with an output bracket (48) that matches the planetary support (44), and a magnetic braided plate (6) is provided on the outer side of the output bracket (48), and a flange wire (7) is horizontally placed on the output bracket (48). The flange wire (7) extends to the outside of the output bracket (48) and is connected to one of the external switch Hall / linear Hall / magnetic encoder. A nitrile rubber ring (5) is provided between the flange front cover (1) and the flange rear cover (2). A nitrile rubber plug (8) is fitted on the flange wire (7).

4. The hub motor for driving a household lawnmower as described in claim 2 or 3, characterized in that: The sun gear (43) and planet gear (46) are both fitted with deep groove ball bearings (9), and countersunk screws (10) are threaded between the planet support (44) and the output support (48). The output bracket (48) has a triangular equidistant insertion of a positioning pin (11) on its outer side. The positioning pin (11) is inserted into the external household lawnmower wheel for positioning. The output bracket (48) has connecting screw holes that are staggered with the positioning pin (11) on its outer side and is fixed to the external household lawnmower wheel by external connecting screws.

5. The hub motor for driving a household lawnmower as described in claim 1, characterized in that: The cooling assembly also includes an embedded flow sensor (123) embedded in the injection head (122), and the outer end of the injection head (122) is connected to a filling head (124), which is connected to a filling pipeline with an external circulation pump.

6. The hub motor for driving a household lawnmower as described in claim 5, characterized in that: The liquid filling head (124) is equipped with an embedded micro pressure regulating valve (125); and a butt joint (13) is fixed on the inner circumference of the liquid collecting ring frame (121), and a docking seat (14) is fixed on the outer circumference of the flange front cover (1). The butt joint (13) and the docking seat (14) are connected one by one by interference fit.

7. The hub motor for driving a household lawnmower as described in claim 5, characterized in that: The circulation head (126) is equipped with an embedded miniature drain valve (127), and the outer end of the circulation head (126) is connected to a drain head (128). The drain head (128) is connected to a drain pipe with an external circulation pump. The external liquid supply pipe and the external drain pipe form a complete coolant circulation supply and discharge pipe through the external circulation pump.

8. The hub motor for driving a household lawnmower as described in claim 1, characterized in that: The liquid collection ring frame (121) is fitted with an embedded temperature sensor (15) on the inner side near the injection head (122) and the circulation head (126). The injection head (122) and the circulation head (126) are connected to the circulation channel (161), and the detection probe of the embedded temperature sensor (15) extends into the circulation channel (161).

9. The hub motor for driving a household lawnmower as described in claim 1, characterized in that: The cold conduction assembly also includes a convex guide head (162) circumferentially connected to the inner end of the liquid collection ring frame (121), and the convex guide head (162) is connected to the circulation channel (161), and a fine mesh (17) is embedded in the inner end of the convex guide head (162). The outer end circumference of the flange front cover (1) is provided with a concave guide groove (163) that connects with the convex guide head (162), and the inner circumference of the flange front cover (1) is provided with a guide port (164) that communicates with the concave guide groove (163), and a flow equalization block (18) is embedded in the guide port (164).

10. The hub motor for driving a household lawnmower as described in claim 1, characterized in that: The inner ring of the flange front cover (1) is fitted with a buffer ring frame (165), and the outer circumference of the buffer ring frame (165) is provided with a cooling port (167) that communicates with the flow guide port (164). The buffer ring frame (165) is embedded with cooling fins (166). The two rows of cooling fins (166) are distributed in a staggered circular pattern along the central axis of the buffer ring frame (165). A cooling groove (19) is opened on the outer side of the buffer ring frame (165), and a cooling ring (168) is embedded in the cooling groove (19).

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