High sealing in wheel motor

Abstract

The application discloses a high-sealing hub motor, which comprises a rotating shaft, an iron core, a steel ring sleeved outside the iron core, and a magnetic steel matched with the iron core and attached to the inner surface of the steel ring, detachable front and rear end covers are connected to the two sides of the steel ring, the central part of the front and rear end covers towards the steel ring is deeply arranged into the steel ring and provided with a convex ridge, the surface of the front and rear end covers towards the steel ring is provided with a gasket groove, a sealing gasket is arranged in the gasket groove, a second convex block for mounting the rotating shaft is arranged in the central part of the rear end cover, a support connected with the rotating shaft is arranged in the second convex block, a fixing seat is connected to the inner side of the support, an encoder connected with the fixing seat is arranged in the support, and a cover plate for covering the support is sealingly connected to the outer side of the central part of the rear end cover.

Description

Technical Field

[0001] This invention relates to a high-sealing hub motor. Background Technology

[0002] In-wheel motors, also known as wheel-mounted motors, are characterized by integrating power, transmission, and braking devices into the wheel hub. This results in a simple structure, high transmission efficiency, and good space utilization. However, the integration of the motor with the hub means it is frequently exposed to moisture from the ground. If the sealing is poor, the motor inside the hub is prone to corrosion and short circuits, affecting its lifespan. Furthermore, traditional in-wheel motors typically have the encoder installed inside the motor, requiring multiple wires to connect the encoder, motor windings, and external cables. The miniaturization of the built-in encoder makes the connecting cables extremely thin, making it highly susceptible to damage from short circuits caused by moisture corrosion inside the motor. This makes disassembly and maintenance difficult, impacting the motor's performance and lifespan. Summary of the Invention

[0003] This invention primarily addresses the technical problems existing in the prior art, thereby providing a highly sealed hub motor that effectively ensures the internal sealing effect of the hub motor, facilitates the user's disassembly and maintenance of the encoder, and effectively improves performance and maintenance convenience.

[0004] This invention relates to a high-sealing hub motor, comprising a shaft, an iron core connected to the outside of the shaft, a steel ring fitted around the outside of the iron core, and a magnet fitted to the inner surface of the steel ring and cooperating with the iron core. A front cover and a rear cover are detachably connected to both sides of the steel ring. A protruding rib is provided in the center of the front cover and the rear cover facing the steel ring, extending into the steel ring and fitting against its inner surface. A gasket groove is provided on the surface of the front cover and the rear cover facing the steel ring, and a sealing gasket is placed inside the gasket groove. A rubber-coated wheel is connected to the outside of the steel ring, and both sides of the rubber-coated wheel are in contact with the sealing gasket. A bracket connected to the shaft is provided in the center of the rear cover, and a fixed seat is connected to the inner side of the bracket. An encoder connected to the fixed seat is located inside the bracket. A cover plate for covering the bracket is sealed to the outer side of the center of the rear cover.

[0005] Preferably, the thickness of the sealing gasket is greater than the depth of the groove, and the thickness of the sealing gasket outside the groove is 15%-20% of the groove depth d. The outer diameter of the sealing gasket is greater than the outer diameter of the steel ring, and the overlap height h between the sealing gasket and the rubber-coated wheel is greater than 2mm. This allows the sealing gasket to completely cover both sides of the steel ring, and the overlap h between the sealing gasket and the rubber-coated wheel is located outside the steel ring. This facilitates compression sealing by the rubber-coated wheel after the steel ring is fixed to the front and rear covers. The thickness of the sealing gasket is between 0.8mm and 1.5mm greater than the depth of the groove, which not only ensures the airtightness of the overlap between the sealing gasket and the rubber-coated wheel, but also allows the sealing gasket to fully cover the groove after being deformed under pressure, thereby fully sealing the connection between the steel ring and the front and rear covers.

[0006] Preferably, the steel ring is connected to the front and rear covers by bolts, with two or more bolts, each bolt passing through a sealing gasket. This allows the front and rear covers to be fixed to the left and right sides of the steel ring by bolts. Sealing gaskets are provided between the front and rear covers and the steel ring to increase airtightness. The bolts passing through the sealing gaskets also prevent external moisture from entering the steel ring through the bolts. The outer sides of the front and rear covers have two or more locking holes, and the outer side of the steel ring has threaded holes corresponding to the locking holes. The bolts pass through the locking holes and are threadedly connected to the threaded holes.

[0007] Preferably, a first protrusion is provided in the center of the front end cover, and a second protrusion is provided in the center of the rear end cover. The first and second protrusions are each provided with a bearing that is movably connected to the rotating shaft. An oil seal is provided at the connection between the front end cover and the rotating shaft. The oil seal is sleeved on the outside of the rotating shaft and located on the side of the front end cover away from the iron core. This allows the bearing to be sleeved on the outside of the rotating shaft and fixedly installed in the first and second protrusions. This allows the front end cover and the rear end cover to be movably connected in the center of the rotating shaft, so that the steel ring can rotate stably on the outside of the rotating shaft through the front end cover. The oil seal also prevents external moisture from entering the inside of the steel ring through the rotating shaft and the front end cover, thus preventing corrosion and short circuits inside the steel ring due to moisture.

[0008] Preferably, the rear end cover has a cavity on the side away from the iron core. The bracket is located inside the cavity and connected to the rotating shaft. A fixing seat is connected to the side of the bracket facing the cover. The encoder is located inside the cavity and connected above the fixing seat. A magnetic bead is provided on the side of the cover facing the encoder, so that the bracket can be fixed to the end of the rotating shaft without contacting the inner surface of the cavity. At the same time, the encoder is also suspended and fixed above the bracket by the fixing seat, avoiding the situation where the encoder is in contact with the surface of the bracket or the rear end cover, which would cause heat accumulation. It also prevents the possibility of water vapor adhering to the inner surface of the cavity of the rear end cover or the surface of the bracket and flowing onto the encoder, reducing the problem of short circuit due to corrosion of the encoder caused by water vapor. The magnetic bead is arranged opposite to the encoder, which facilitates the encoder to detect the rotation of the rear end cover through the magnetic bead.

[0009] Preferably, a first adhesive groove is provided in the center of the rear end cover, and the first adhesive groove is filled with sealant. The cover plate is detachably connected to the first adhesive groove and adheres to the sealant. The cover plate is attached to the first adhesive groove and fixed to the center of the rear end cover by screws. The surface of the first adhesive groove is coated with sealant to increase the airtightness after the cover plate is connected to the rear end cover, effectively preventing the possibility of external rainwater entering the cavity through the cover plate.

[0010] Preferably, the rotating shaft has a through hole, and a through hole communicating with the through hole is provided in the center of the rotating shaft. A second groove communicating with the through hole is provided at one end of the rotating shaft outside the steel ring. A cable passing through the second groove and connected to the encoder and iron core is provided inside the through hole. Sealant is provided inside the second groove. A side hole is provided on the side of the bracket, allowing a portion of the cable to pass through the through hole inside the rotating shaft and through the side hole to connect electrically to the encoder. Another portion of the cable can be led out through the through hole on the side of the rotating shaft and connected electrically to the winding in the iron core. The cable is a power cable, and the iron core is a stator core winding. The power cable connected to the hub motor passes through the through hole of the rotating shaft into the steel ring, and the through hole inside the rotating shaft is sealed with sealant.

[0011] Preferably, the end of the rotating shaft is provided with a screw, the side of the screw is provided with a limiting groove, the center of the screw is provided with an anti-rotation plate that cooperates with the limiting groove and a nut that is threadedly connected to the screw, so that the hub motor can be installed through the screw at the end of the rotating shaft and fixed by the nut and the anti-rotation plate.

[0012] The beneficial effects of this invention are as follows: The surfaces of the front and rear covers are provided with grooves for placing sealing gaskets. Both the front and rear covers have protruding ribs on the center of the side facing the steel ring. These ribs penetrate into the steel ring and adhere to its inner surface. This increases the airtightness between the steel ring and the front and rear covers through the sealing gaskets, preventing external moisture from entering the steel ring through the gaps between the front and rear covers, effectively ensuring the sealing effect inside the steel ring. Simultaneously, the rubber-coated wheels connected to the outside of the steel ring contact the sealing gaskets on both sides of the steel ring, allowing a portion of the rubber-coated wheels on the outside of the steel ring to contact and press against the sealing gaskets, further increasing the airtightness between the front and rear covers. Even if there are small gaps between the steel ring and the front and rear covers due to size inconsistencies, the mutual pressing between the sides of the rubber-coated wheels and the sealing gaskets can isolate and seal them, thus preventing external moisture from entering the steel ring through the gaps between the front and rear covers and causing corrosion or short circuits in the hub motor. The design effectively addresses damage issues, ensuring the internal sealing performance and lifespan of the hub motor. A bracket connected to the rotating shaft is located in the center of the rear cover, with an encoder mounting base on the inner side of the bracket. This avoids the maintenance difficulties associated with conventional encoders directly installed inside the steel ring, facilitating easy disassembly and maintenance. This significantly improves the convenience of encoder repair, maintenance, and use. Furthermore, the suspended mounting of the encoder and the central bracket in the rear cover not only enhances encoder heat dissipation and reduces heat buildup caused by the encoder being directly attached, but also prevents rainwater or moisture from entering the cavity and condensing on the inner surface, potentially flowing onto the encoder. The encoder is sealed by a cover plate, and sealant is applied to the first groove at the connection between the cover plate and the rear cover, further preventing rainwater or moisture from entering the cavity. This greatly improves the encoder's sealing performance and, consequently, enhances the overall performance of the hub motor. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0014] Figure 1 This is a schematic diagram of the overall structure of a high-sealing hub motor according to the present invention; Figure 2 This is a cross-sectional view of the overall structure of a high-sealing hub motor according to the present invention; Figure 3 This is an exploded view of the overall structure of a high-sealing hub motor according to the present invention; Figure 4 for Figure 2 A magnified view of part A in the image; Figure 5 for Figure 2 A magnified view of part B in the image; Figure 6 This is a schematic diagram of the structure of the rear end cover in a high-sealing hub motor according to the present invention; Figure 7 This is a schematic diagram of the structure of the rear end cover in another direction of a high-sealing hub motor according to the present invention. Detailed Implementation

[0015] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0016] like Figures 1 to 7 The high-sealing hub motor shown includes a rotating shaft 2, an iron core 21 connected to the outside of the rotating shaft 2, a steel ring 1 sleeved on the outside of the iron core 21, and a magnet 12 fitted to the inner surface of the steel ring 1 and cooperating with the iron core 21. A front end cover 4 and a rear end cover 3 are detachably connected to both sides of the steel ring 1. A protrusion 34 is provided in the center of both the front end cover 4 and the rear end cover 3 facing the steel ring 1. The protrusion 34 extends into the interior of the steel ring 1 and fits against the inner surface of the steel ring 1. A groove 32 is provided on one side of the surface, and a sealing gasket 6 is provided inside the groove 32. A rubber-coated wheel 11 is connected to the outside of the steel ring 1, and both sides of the rubber-coated wheel 11 are in contact with the sealing gasket 6. A bracket 22 connected to the rotating shaft 2 is provided in the center of the rear end cover 3. A fixed seat 225 is connected to the inside of the bracket 22. An encoder 222 connected to the fixed seat 225 is provided inside the bracket 22. A cover plate 221 for covering the bracket 22 is sealed to the outside of the center of the rear end cover 3.

[0017] The thickness of the sealing gasket 6 is greater than the depth of the groove 32, and the thickness of the sealing gasket 6 outside the groove 32 is 15%-20% of the depth d of the groove 32. The outer diameter of the sealing gasket 6 is greater than the outer diameter of the steel ring 1, and the overlap height h between the sealing gasket 6 and the rubber-coated wheel 11 is greater than 2mm. This allows the sealing gasket 6 to completely cover both sides of the steel ring 1, and the overlap h between the sealing gasket 6 and the rubber-coated wheel 11 is located outside the steel ring 1. This allows the rubber-coated wheel 11 to compress and seal the steel ring 1 after it is fixed to the front cover 4 and the rear cover 3. The thickness of the sealing gasket 6 is greater than the depth of the groove 32 by 0.8mm-1.5mm, which not only ensures the airtightness of the overlap between the sealing gasket 6 and the rubber-coated wheel 11, but also allows the sealing gasket 6 to fully cover the groove 32 after being deformed under pressure, thereby fully sealing the connection between the steel ring 1 and the front cover 4 and the rear cover 3.

[0018] The steel ring 1 is connected to the front cover 4 and the rear cover 3 by bolts 13. There are two or more bolts 13, and each bolt 13 passes through a sealing gasket 6. The front cover 4 and the rear cover 3 are fixed to the left and right sides of the steel ring 1 by bolts 13. Sealing gaskets 6 are provided between the front cover 4 and the steel ring 1 and between the rear cover 3 and the steel ring 1 to increase airtightness. The setting of the bolts 13 passing through the sealing gaskets 6 also prevents the possibility of external moisture entering the interior of the steel ring 1 through the bolts 13. There are two or more locking holes 33 on the outer side of the front cover 4 and the rear cover 3. The outer side of the steel ring 1 is provided with screw holes (not marked) corresponding to the locking holes 33. The bolts 13 pass through the locking holes 33 and are threadedly connected to the screw holes (not marked).

[0019] The front cover 4 has a first protrusion 41 in the center, and the rear cover 3 has a second protrusion 31 in the center. Both the first protrusion 41 and the second protrusion 31 have bearings 23 that are movably connected to the rotating shaft 2 inside. An oil seal 5 is provided at the connection between the front cover 4 and the rotating shaft 2. The oil seal 5 is sleeved on the outside of the rotating shaft 2 and located on the side of the front cover 4 away from the iron core 21. This allows the bearings 23 to be sleeved on the outside of the rotating shaft 2 and fixedly installed inside the first protrusion 41 and the second protrusion 31. This allows the front cover 4 and the rear cover 3 to be movably connected to the center of the rotating shaft 2, so that the steel ring 1 can rotate stably on the outside of the rotating shaft 2 through the front cover 4 and the rear cover 3. The oil seal 5 prevents external moisture from passing through the rotating shaft 2 and the front cover 4 into the interior of the steel ring 1, thus preventing corrosion and short circuits inside the steel ring 1 due to moisture.

[0020] The rear cover 3 has a cavity 35 on the side away from the iron core 21. The bracket 22 is disposed in the cavity 35 and connected to the rotating shaft 2. A fixing seat 225 is connected to the side of the bracket 22 facing the cover plate 221. The encoder 222 is located in the cavity 35 and connected above the fixing seat 225. A magnetic bead 223 is disposed on the side of the cover plate 221 facing the encoder 222, so that the bracket 22 can be fixed to the end of the rotating shaft 2 without contacting the inner surface of the cavity 35, while allowing the encoder 222 to pass through. The encoder 222 is suspended and fixed above the bracket 22 by the mounting base 225, which avoids the encoder 222 from sticking to the surface of the bracket 22 or the rear cover 3 and causing heat accumulation. It also prevents moisture from adhering to the inner surface of the cavity 35 of the rear cover 3 or the surface of the bracket 22 and flowing onto the encoder 222, reducing the problem of corrosion and short circuit of the encoder 222 due to moisture. The magnetic bead 223 is set opposite to the encoder 222, which makes it easier for the encoder 222 to detect the rotation of the rear cover 3 through the magnetic bead 224.

[0021] The rear cover 3 has a first adhesive groove 36 in the center, and the first adhesive groove 36 is filled with sealant 8. The cover plate 221 is detachably connected to the first adhesive groove 36 and is in contact with the sealant 8. The cover plate 221 is in contact with the first adhesive groove 36 and is fixed to the center of the rear cover 3 by screws. The surface of the first adhesive groove 36 is coated with sealant 8 to increase the airtightness of the cover plate 221 after it is connected to the rear cover 3, effectively preventing rainwater from entering the cavity 35 through the cover plate 221.

[0022] A wire hole 24 is provided inside the rotating shaft 2, and a through hole 242 communicating with the wire hole 24 is provided in the center of the rotating shaft 2. A second adhesive groove 241 communicating with the wire hole 24 is provided at one end of the rotating shaft 2 outside the steel ring 1. A cable 72 passing through the second adhesive groove 241 and connected to the encoder 222 and the iron core 21 is provided inside the wire hole 24. Sealant 8 is provided inside the second adhesive groove 241. A side hole 224 is provided on the side of the bracket 22, allowing the cable 72 to pass through. A portion of the cable 72 can pass through the wire hole 24 inside the rotating shaft 2 and through the side hole 224 to be electrically connected to the encoder 222, while another portion of the cable 72 can be led out through the through hole 242 on the side of the rotating shaft 2 to be electrically connected to the winding in the iron core 21. The cable 72 is an electric wire, and the iron core 21 is a stator iron core winding. The electric wire 72 connected in the hub motor passes through the wire hole 24 of the rotating shaft 2 and enters the steel ring 1, and the wire hole 24 inside the rotating shaft 2 is sealed by the sealant 8.

[0023] The end of the rotating shaft 2 is provided with a screw 25, and the side of the screw 25 is provided with a limiting groove 251. The center of the screw 25 is provided with an anti-rotation plate 71 that cooperates with the limiting groove 251 and a nut 7 that is threadedly connected to the screw 25, so that the hub motor can be installed through the screw 25 at the end of the rotating shaft 2 and fixed by the nut 7 and the anti-rotation plate 71.

[0024] The core 21 of the high-sealing hub motor is fixedly mounted in the center of the rotating shaft 2, with the steel ring 1 covering the outside of the core 21. The core 21 is further covered by the front end cover 4 and the rear end cover 3 on both sides of the steel ring 1. Bearings 23 are fixedly mounted on the first protrusion 41 and the second protrusion 31 in the center of the front end cover 4 and the rear end cover 3, respectively. The bearings 23 are respectively sleeved and fixed on both sides of the center of the rotating shaft 2, allowing the front end cover 4 and the rear end cover 3 to rotate around the rotating shaft 2. The bracket 22 for fixing the encoder 222 is interference-fitted onto the end of the rotating shaft 2 and located in the cavity 35 of the rear end cover 3. The encoder 222 is fixedly mounted on the mounting base 225 of the bracket 22 by screws. The wire cable 72 passes through the wire hole 2 in the center of the rotating shaft 2. 4 and through hole 242 are respectively connected to the stator windings of encoder 222 and iron core 21 for wire connection. At the same time, the sealing gasket 6 at the connection between steel ring 1 and front cover 4 and rear cover 3 is used for isolation and sealing. The oil seal 5 on the outside of front cover 4 is used for isolation and sealing at the connection of shaft 2. The cover plate 221 in the center of rear cover 3 covers and seals the cavity 35 and the internal encoder 222. The application of sealant 8 in the second glue groove 241 at the port of shaft 2 is used to increase the sealing of the wire cable 72 entering the wire hole 24 at the port of shaft 2. The application of sealant 8 in the first glue groove 36 in the center of rear cover 3 is used to ensure the airtightness of cover plate 221 covering and closing the cavity 35, ensuring the sealing effect of encoder 222 after storage. The beneficial effects of this invention are as follows: The surfaces of the front and rear covers are provided with grooves for placing sealing gaskets. Both the front and rear covers have protruding ribs on the center of the side facing the steel ring. These ribs penetrate into the steel ring and adhere to its inner surface. This increases the airtightness between the steel ring and the front and rear covers through the sealing gaskets, preventing external moisture from entering the steel ring through the gaps between the front and rear covers, effectively ensuring the sealing effect inside the steel ring. Simultaneously, the rubber-coated wheels connected to the outside of the steel ring contact the sealing gaskets on both sides of the steel ring, allowing a portion of the rubber-coated wheels on the outside of the steel ring to contact and press against the sealing gaskets, further increasing the airtightness between the front and rear covers. Even if there are small gaps between the steel ring and the front and rear covers due to size inconsistencies, the mutual pressing between the sides of the rubber-coated wheels and the sealing gaskets can isolate and seal them, thus preventing external moisture from entering the steel ring through the gaps between the front and rear covers and causing corrosion or short circuits in the hub motor. The design effectively addresses damage issues, ensuring the internal sealing performance and lifespan of the hub motor. A bracket connected to the rotating shaft is located in the center of the rear cover, with an encoder mounting base on the inner side of the bracket. This avoids the maintenance difficulties associated with conventional encoders directly installed inside the steel ring, facilitating easy disassembly and maintenance. This significantly improves the convenience of encoder repair, maintenance, and use. Furthermore, the suspended mounting of the encoder and the central bracket in the rear cover not only enhances encoder heat dissipation and reduces heat buildup caused by the encoder being directly attached, but also prevents rainwater or moisture from entering the cavity and condensing on the inner surface, potentially flowing onto the encoder. The encoder is sealed by a cover plate, and sealant is applied to the first groove at the connection between the cover plate and the rear cover, further preventing rainwater or moisture from entering the cavity. This greatly improves the encoder's sealing performance and, consequently, enhances the overall performance of the hub motor.

[0025] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A high-sealing hub motor, comprising a shaft, an iron core connected to the outside of the shaft, a steel ring sleeved on the outside of the iron core, and a magnet fitted to the inner surface of the steel ring and cooperating with the iron core, wherein a front end cover and a rear end cover are detachably connected to both sides of the steel ring, characterized in that: Both the front and rear covers have a raised rib on the center of the side facing the steel ring. The raised rib extends into the steel ring and fits against the inner surface of the steel ring. Both the front and rear covers have a gasket groove on the surface facing the steel ring. A sealing gasket is placed inside the gasket groove. A rubber-coated wheel is connected to the outer side of the steel ring, and both sides of the rubber-coated wheel are in contact with the sealing gasket. A bracket connected to a rotating shaft is provided in the center of the rear cover. A fixed seat is connected to the inner side of the bracket. An encoder connected to the fixed seat is provided inside the bracket. A cover plate for covering the bracket is sealed to the outer side of the center of the rear cover.

2. The high-sealing hub motor according to claim 1, characterized in that: The thickness of the sealing gasket is greater than the depth of the groove, and the thickness of the sealing gasket outside the groove is 15%-20% of the groove depth d. The outer diameter of the sealing gasket is greater than the outer diameter of the steel ring, and the overlap height h between the sealing gasket and the rubber-coated wheel is greater than 2mm.

3. A high-sealing hub motor according to claim 2, characterized in that: The steel ring is connected to the front and rear covers by bolts. There are two or more bolts, and each bolt penetrates the sealing gasket.

4. A high-sealing hub motor according to claim 3, characterized in that: The front end cover has a first protrusion in the center, and the rear end cover has a second protrusion in the center. Both the first and second protrusions have bearings that are movably connected to the rotating shaft inside. An oil seal is provided at the connection between the front end cover and the rotating shaft. The oil seal is sleeved on the outside of the rotating shaft and located on the side of the front end cover away from the iron core.

5. A high-sealing hub motor according to claim 4, characterized in that: The rear cover has a cavity on the side away from the iron core. The bracket is located inside the cavity and connected to the rotating shaft. A fixed seat is connected to the side of the bracket facing the cover. The encoder is located inside the cavity and connected above the fixed seat. A magnetic bead is provided on the side of the cover facing the encoder.

6. A high-sealing hub motor according to claim 5, characterized in that: The rear cover has a first adhesive groove in the center, and the first adhesive groove contains sealant. The cover plate is detachably connected to the first adhesive groove and is bonded to the sealant.

7. A high-sealing hub motor according to any one of claims 1-6, characterized in that: The shaft has a through hole, and a through hole connected to the through hole is provided in the center of the shaft. The shaft has a second groove connected to the through hole at one end outside the steel ring. A cable is provided inside the through hole, passing through the second groove and connected to the encoder and iron core. The second groove is filled with sealant.

8. A high-sealing hub motor according to claim 7, characterized in that: The end of the rotating shaft is provided with a screw, the side of the screw is provided with a limit groove, and the center of the screw is provided with an anti-rotation plate that cooperates with the limit groove and a nut that is threadedly connected to the screw.

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