A hub motor connecting flange

Abstract

This utility model discloses a hub motor connection flange, comprising an integrally formed stepped flange body, consisting of a disc-shaped first part and an inner convex ring-shaped second part. A polygonal shaft connection hole is provided in the center for insertion and mating with the stator shaft of the hub motor, and is secured by a locking screw to ensure high-precision circumferential positioning and prevent loosening and angular backlash. The flange body has a host connection hole and a locking hole on its side, supporting rapid assembly and maintenance. The inner convex ring has a connection island, optimizing structural strength and weight. The flange is made of aluminum alloy, titanium alloy, or magnesium alloy, combining lightweight and high strength. This solution effectively solves the problems of loose connection, inaccurate positioning, and excessive weight in existing technologies, and is suitable for scenarios with high precision and reliability requirements, such as robotic vacuum cleaners.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, and in particular to a hub motor connection flange. Background Technology

[0002] With the development of smart home technology, hub motors, due to their compact structure and direct power output, have been widely used in mobile cleaning devices such as robotic vacuum cleaners. Current robotic vacuum cleaners typically employ a dual-wheel independent drive architecture, with each drive wheel directly driven by a hub motor. The hub motor and the robot's main unit are mechanically connected and power is transmitted via a connecting flange. This connection structure directly affects the robot's motion performance and navigation accuracy, making it a critical component related to the product's core performance.

[0003] However, existing hub motor connection flanges have the following technical defects: 1. Existing connection flanges mostly use a simple flange structure with bolt fixing, lacking specialized positioning and anti-rotation design. During frequent robot starts and stops, sharp turns, and operation on complex terrain, the motor output shaft and flange connection are prone to slight relative displacement, leading to loosening after long-term use. This loosening not only generates abnormal noise but also reduces power transmission efficiency, affecting the robot's climbing ability and load capacity; 2. Sweeping robots are usually equipped with odometers and inertial navigation systems for positioning and navigation, and their positioning accuracy is highly dependent on the precise control of the drive wheel rotation angle. Existing connection flanges generally lack angle limit structures or use simple positioning pin designs with insufficient precision, causing angle hysteresis to easily occur when the motor output shaft switches between forward and reverse directions; 3. Existing connection flanges are heavy and thick, increasing the overall width of the sweeping robot, which is not conducive to the robot's operation. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a hub motor connection flange that, while ensuring structural strength and lightweight design, guarantees connection stability and improves the momentum conversion accuracy of the hub motor, thereby enhancing the navigation and positioning accuracy of the sweeping robot.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a hub motor connection flange, comprising an integrally formed flange body for connecting the main unit and the stator shaft of the hub motor. The flange body includes a first part and a second part. The first part is disc-shaped, and the second part is formed at the center of one side of the first part. The outer diameter of the second part is smaller than the outer diameter of the first part, and the two together form a stepped flange body. The first part and the second part are concentrically arranged. A shaft connection hole is opened at the center of the flange body, which matches the stator shaft of the hub motor for connecting the stator shaft. The shaft connection hole is polygonal. Multiple locking holes are opened on the side of the second part, which penetrate along the radial direction of the flange body. Each locking hole is threaded with a locking screw. The shaft connection hole is sleeved on the stator shaft of the hub motor and locked to the stator shaft of the hub motor by the locking screw. Multiple main unit connection holes are opened on the side of the flange body for connecting the main unit. The main unit connection holes are evenly distributed along the circumferential direction.

[0006] In a further technical solution, the second part is formed on the inner side of the flange body. The second part includes an inner convex ring, which is polygonal. Each corner of the inner convex ring is formed with a connecting island, and the main unit connection hole is formed through the connecting island.

[0007] In a further technical solution, the profile of the shaft connection hole is an equal quadrilateral; the four sides of the stator shaft of the hub motor are formed with positioning surfaces, and the positioning surfaces are combined to form a plug-in part. The cross-sectional shape and size of the plug-in part match the shaft connection hole. The bottom of each positioning surface forms a limiting step, and each limiting step is matched with the limiting of the inner convex ring; each positioning surface is provided with an internal threaded hole, which is aligned with the locking hole inside and out, and the locking screw is threaded into the internal threaded hole to lock the flange body.

[0008] In a further technical solution, the thickness D1 of the first part is 2mm-8mm; the thickness D2 of the second part is 3mm-9mm.

[0009] In a further technical solution, a positioning ring is formed at the top of the stator shaft of the hub motor. The positioning ring has a limiting notch. When the flange body is assembled onto the stator shaft of the hub motor, the positioning ring and the limiting notch protrude from the side of the flange body to prevent foolproof installation of the flange body and the hub motor.

[0010] In a further technical solution, the hub motor includes a rotor housing, a tire, and an inner sealing plate. The tire is fixed to the periphery of the rotor housing. The inner sealing plate is fixed to the inner side of the rotor housing by bolts. The stator shaft of the hub motor is rotatably connected to the rotor housing. A gap of 0.2mm-1.2mm is formed between the inner side of the flange body and the outer surface of the inner sealing plate.

[0011] In a further technical solution, the flange body is integrally formed from aluminum alloy, titanium alloy, or magnesium alloy.

[0012] In a further technical solution, the outer diameter of the flange body is 5cm-15cm.

[0013] The advantages of this invention compared to the prior art after adopting the above structure are:

[0014] 1. The polygonal insertion fit between the shaft connecting hole and the stator shaft, combined with the limiting step, achieves circumferential positioning, eliminates the angular backlash when the motor rotates forward and backward, significantly improves steering accuracy, and can reduce the positioning deviation to within ±0.5°, solving the problem of robot vacuum cleaner path deviation caused by angular deviation in the existing technology.

[0015] 2. The fastening structure of the locking screw and the internal threaded hole of the stator shaft effectively resists high-frequency vibration and impact, prevents loosening of the connection after long-term use, reduces the occurrence of abnormal noise, and extends the motor life.

[0016] 3. The flange body is made of aluminum alloy, titanium alloy, or magnesium alloy in one piece, with an outer diameter of only 5-15cm. While ensuring structural strength, the weight is reduced by 30%-50% compared to traditional steel flanges, directly reducing the overall weight of the sweeping robot and improving its mobility and battery life. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of a hub motor equipped with the connecting flange of this utility model.

[0019] Figure 2 This is a disassembly diagram of the connecting flange equipped with this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the connecting flange equipped with this utility model.

[0021] Figure 4 This is a structural schematic diagram from another perspective of the connecting flange equipped with this utility model.

[0022] Figure 5 This is a side view of the structural diagram of the connecting flange equipped with this utility model. Detailed Implementation

[0023] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0024] like Figures 1 to 5As shown, a hub motor connection flange includes an integrally formed flange body 1, which is made of aluminum alloy. The outer diameter of the flange body 1 is 7.5 cm. The flange body 1 is used for the connection between the main unit and the stator shaft 2 of the hub motor. The flange body 1 includes a first part 11 and a second part 12. The first part 11 is disc-shaped, and the second part 12 is formed at the center of one side of the first part 11. The outer diameter of the second part 12 is smaller than the outer diameter of the first part 11. Together, they form a stepped flange body 1. The first part 11 and the second part 12 are concentrically arranged. A shaft connection hole 10 is formed at the center of the flange body 1, and the shaft connection hole 10 is connected to the stator shaft of the hub motor. 2. Matching, for connecting the stator shaft 2 of the hub motor, the shaft connecting hole 10 is polygonal, and the side of the second part 12 is provided with multiple locking holes 101 that penetrate along the radial direction of the flange body 1. Each locking hole 101 is threaded with a locking screw 13. The shaft connecting hole 10 is sleeved on the stator shaft 2 of the hub motor and locked to the stator shaft 2 of the hub motor by the locking screw 13. The side of the flange body 1 is provided with multiple host connecting holes 102 for connecting the host, and the host connecting holes 102 are evenly distributed along the circumferential direction.

[0025] The polygonal insertion fit between the shaft connecting hole 10 and the stator shaft 2, combined with the limiting step 22, achieves circumferential positioning, eliminates the angular backlash when the motor rotates forward and backward, significantly improves steering accuracy, and can reduce the positioning deviation to within ±0.5°, thus solving the problem of path deviation of the sweeping robot caused by angular deviation in the existing technology.

[0026] Specifically, the second part 12 is formed on the inner side of the flange body 1. The second part 12 includes an inner convex ring 121, which is polygonal. Each corner of the inner convex ring 121 has a connecting island 122 formed thereon, and the main unit connecting hole 102 is formed through the connecting island 122. This stepped flange body 1 structure can ensure its structural strength while minimizing weight and reducing energy consumption.

[0027] The flange body 1 is made of aluminum alloy in one piece with an outer diameter of only 5-15cm. While ensuring structural strength, it is 30%-50% lighter than traditional steel flanges, which directly reduces the overall weight of the sweeping robot and improves its mobility and battery life.

[0028] Specifically, the hole profile of the shaft connecting hole 10 is set in the shape of an equal quadrilateral; the four sides of the stator shaft 2 of the hub motor are respectively formed with positioning surfaces 21, and each positioning surface 21 is combined to form a plug-in part. The cross-sectional shape and size of the plug-in part match the shaft connecting hole 10. The bottom of each positioning surface 21 is respectively formed with a limiting step 22, and each limiting step 22 is respectively matched with the limiting of the inner convex ring 121; each positioning surface 21 is respectively provided with an internal threaded hole 210, the internal threaded hole 210 is aligned with the locking hole 101, and the locking screw 13 is threadedly connected to the internal threaded hole 210 to lock the flange body 1.

[0029] The fastening structure of the locking screw and the internal threaded hole of the stator shaft effectively resists high-frequency vibration and impact, prevents loosening of the connection after long-term use, reduces the occurrence of abnormal noise, and extends the motor life.

[0030] Specifically, the thickness D1 of the first part 11 is 3mm; the thickness D2 of the second part 12 is 4mm.

[0031] Specifically, a positioning ring is formed at the top of the stator shaft 2 of the hub motor. The positioning ring has a limiting notch. When the flange body 1 is assembled onto the stator shaft 2 of the hub motor, the positioning ring and the limiting notch protrude from the side of the flange body 1 to prevent foolproof installation of the flange body 1 and the hub motor.

[0032] Specifically, the hub motor includes a rotor housing, a tire, and an inner sealing plate. The tire is fixed to the periphery of the rotor housing. The inner sealing plate is fixed to the inner side of the rotor housing by bolts. The stator shaft 2 of the hub motor is rotatably connected to the rotor housing. A gap of 0.5mm is formed between the inner side of the flange body 1 and the outer surface of the inner sealing plate.

[0033] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hub motor connection flange, characterized in that: The flange body (1) is integrally formed and is used for the connection between the main unit and the stator shaft (2) of the hub motor. The flange body (1) includes a first part (11) and a second part (12). The first part (11) is disc-shaped, and the second part (12) is formed at the center of one side of the first part (11). The outer diameter of the second part (12) is smaller than the outer diameter of the first part (11). Together, they form a stepped flange body (1). The first part (11) and the second part (12) are concentrically arranged. The flange body (1) has a shaft connection hole (10) at its center. The shaft connection hole (10) matches the stator shaft (2) of the hub motor and is used to connect the stator shaft (2) of the hub motor. The shaft connection hole (10) is polygonal. The second part (12) has multiple locking holes (101) that penetrate the flange body (1) radially. Each locking hole (101) is threaded with a locking screw (13). The shaft connection hole (10) is sleeved on the stator shaft (2) of the hub motor and is locked to the stator shaft (2) of the hub motor by the locking screw (13). The flange body (1) has multiple host connection holes (102) on its side for connecting the host. The host connection holes (102) are evenly distributed along the circumferential direction.

2. The hub motor connection flange according to claim 1, characterized in that: The second part (12) is formed on the inner side of the flange body (1). The second part (12) includes an inner convex ring (121), which is polygonal. Each corner of the inner convex ring (121) is formed with a connecting island (122), and the host connection hole (102) is formed through the connecting island (122).

3. The hub motor connection flange according to claim 2, characterized in that: The hole profile of the shaft connecting hole (10) is an equal quadrilateral; the four sides of the stator shaft (2) of the hub motor are respectively formed with positioning surfaces (21), and each positioning surface (21) is combined to form a plug-in part. The cross-sectional shape and size of the plug-in part match the shaft connecting hole (10). The bottom of each positioning surface (21) is respectively formed with a limiting step (22), and each limiting step (22) is respectively matched with the limiting of the inner convex ring (121); each positioning surface (21) is respectively provided with an internal thread hole (210), the internal thread hole (210) is aligned with the locking hole (101) inside and out, and the locking screw (13) is threaded to the internal thread hole (210) to lock the flange body (1).

4. A hub motor connection flange according to claim 3, characterized in that: The thickness D1 of the first part (11) is 2mm-8mm; the thickness D2 of the second part (12) is 3mm-9mm.

5. A hub motor connection flange according to claim 4, characterized in that: The top end of the stator shaft (2) of the hub motor is formed with a positioning ring and a limiting notch. When the flange body (1) is assembled on the stator shaft (2) of the hub motor, the positioning ring and the limiting notch protrude from the side of the flange body (1) to prevent mistaken installation of the flange body (1) and the hub motor.

6. A hub motor connection flange according to claim 1, characterized in that: The hub motor includes a rotor housing, a tire, and an inner sealing plate. The tire is fixed to the periphery of the rotor housing. The inner sealing plate is fixed to the inner side of the rotor housing by bolts. The stator shaft (2) of the hub motor is rotatably connected to the rotor housing. A gap is formed between the inner side of the flange body (1) and the outer surface of the inner sealing plate, with a gap of 0.2mm-1.2mm.

7. A hub motor connection flange according to claim 1, characterized in that: The flange body (1) is integrally formed from aluminum alloy, titanium alloy or magnesium alloy.

8. A hub motor connection flange according to claim 1, characterized in that: The outer diameter of the flange body (1) is 5cm-15cm.

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