Magnetic steel ring with diversion trenches and hub motor with magnetic steel ring

Abstract

The utility model discloses a magnetic steel ring with a diversion trench and a hub motor with the magnetic steel ring, and belongs to the technical field of wheel power transmission. The utility model discloses a magnetic steel ring with a diversion trench. The diversion trench is formed in the inner wall of one side of an outer rotor magnetic steel ring along the circumferential direction. The diversion trench is positioned on the inner wall of one side, close to the motor left cover, of the magnetic steel ring of the outer rotor; the motor forms an oil suspension storage circulation cold oil chamber motor working chamber, and the motor working chamber and the oil suspension storage circulation cold oil chamber are communicated with each other to form a cooling oil circulation heat dissipation system. The beneficial effects of the utility model are that the diversion trench has a certain width and depth, oil in the motor cavity can be discharged from a high position to a low position of the diversion trench on the inner wall of the magnetic steel ring when the motor works, the oil is discharged smoothly in the motor air gap, oil resistance cannot be generated in the motor air gap and the motor cavity, the pressure of the oil rotating and stirring in the motor can be effectively released, and the service life of the motor is prolonged. And the motor performance is greatly improved.

Description

Technical Field

[0001] A magnetic steel ring with a built-in guide groove and a hub motor with the magnetic steel ring belong to the field of wheel power transmission technology, and particularly relate to wheel power transmission devices for electric motorcycles and electric bicycles. Background Technology

[0002] Currently, in ordinary oil-cooled motors used in electric vehicles on the market, the oil inside the motor cavity must drain into the space formed by the inner wall of the outer rotor magnet ring. Because the inner walls at both ends of the outer rotor magnet ring are flat, the space formed by this inner wall is a narrow, flat space. When the motor rotates, there is insufficient space for the oil draining into the outer rotor magnet ring from the motor cavity. The oil can only swirl and splash within this flat space. The oil pressure in this flat space cannot be released effectively and in a timely manner, causing the oil to stagnate in the motor's air gap and prevent smooth drainage. The oil stagnating in the air gap and the swirling oil in the flat space of the magnet ring easily generate rotational resistance, which causes the motor to consume extra power and reduces its driving range. As the motor runs, the temperature continuously rises, and thermal expansion gas pressure quickly forms in the flat space. This thermal expansion gas pressure, when released to the outside, will also cause oil overflow and leakage, resulting in energy waste and reduced motor performance. To address this issue, the specification page 3 of patent number ZL202121834110.X, entitled "An Integrated Cover for a Hub Motor and a Hub Motor with the Integrated Cover," states: "A first convex ring 3.6 is provided along the circumference of the cover body 3. The outer ring of the first convex ring 3.6 extends upward and is bent to form a second convex ring 3.4. A guide groove 3.5 is formed between the first convex ring 3.6 and the second convex ring 3.4 at the oil drain groove 3.3. The design of this guide groove effectively releases the pressure of the rotating and stirring oil inside the motor, achieving oil circulation and cooling while easily draining the oil in the motor air gap. This prevents oil resistance in the motor air gap and motor cavity, ensuring smooth oil drainage and allowing the electric vehicle to run smoothly and travel further. The disadvantage of this type of motor is that the structure of the motor needs to be changed or additional parts added to accommodate the guide groove, resulting in a complex structure, numerous manufacturing processes, and thus higher manufacturing costs." Summary of the Invention

[0003] The problem this utility model aims to solve is to provide a simplified external rotor magnet ring and a hub motor incorporating the aforementioned shortcomings. The technical solution is as follows:

[0004] A magnet ring with a built-in guide groove is characterized by a guide groove circumferentially formed on the inner wall of one side of the outer rotor magnet ring. The guide groove has a width of 5–25 mm and a depth of 2–6 mm. The cross-sectional shape of the guide groove can be U-shaped, solid, V-shaped, trapezoidal, semi-circular, etc.

[0005] A hub motor with a magnetic steel ring featuring a built-in guide groove includes a motor and a hub steel ring. The motor includes a motor shaft, a stator, and an outer rotor magnetic steel ring. The hub steel ring is fixedly connected to the outer rotor magnetic steel ring, which is fitted onto the stator. One end of the outer rotor magnetic steel ring is fixedly connected to the left cover of the motor, and the other end is fixedly connected to the motor drum cover. The key technology is that the outer rotor magnetic steel ring has a built-in guide groove located on the inner wall of the outer rotor magnetic steel ring near the left cover of the motor. A cooling oil separation and circulation hood is installed inside the left cover of the motor. The space enclosed by the left cover of the motor, the inner wall of one end of the outer rotor magnetic steel ring, the guide groove, and one side of the cooling oil separation and circulation hood constitutes an oil suspension storage and circulation cooling oil chamber. The space enclosed by the inner wall of the other end of the outer rotor magnetic steel ring, the motor drum cover, the motor shaft, and the other side of the cooling oil separation and circulation hood constitutes the motor working chamber. The motor working chamber and the oil suspension storage and circulation cooling oil chamber are interconnected to form a cooling oil circulation and heat dissipation system.

[0006] The cooling oil separator circulation cover has an oil drain groove on its circumference, and the oil drain groove is installed in conjunction with the guide groove.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] 1. This utility model creatively designs an external rotor magnet ring with a built-in guide groove. The guide groove has a certain width and depth, and its bottom is lower than the inner wall plane of the magnet ring. The oil level in the motor cavity and the bottom of the guide groove form a suitable height difference. When the motor is working, the oil in the motor cavity will be discharged from the higher part to the lower part of the guide groove on the inner wall of the magnet ring. First, the design of the guide groove makes the inner wall of the magnet ring have a lower bottom, increasing the space for accommodating oil. Second, the guide groove has a guiding effect on the oil, so the oil will not be retained in the air gap of the motor, but will be discharged smoothly. There will be no oil resistance in the air gap and motor cavity, and the pressure of the rotating and stirring oil in the motor can be effectively released, which greatly improves the motor performance and has the advantage of being maintenance-free for life after one shipment.

[0009] 2. The combination of the outer rotor magnet ring with its own guide groove and the cooling oil separation circulation cover, the cooling oil separation circulation cover is equipped with an oil drain groove that connects with the guide groove, and the cooling oil separation circulation cover and the outer rotor magnet ring together form an oil suspension storage circulation cold oil chamber, which is a strong guarantee for smooth oil drainage in the motor working chamber and the motor air gap.

[0010] 3. This utility model does not add any parts or change the structure, but directly changes the manufacturing process, simplifies the assembly process, simplifies the overall structure of the motor, reduces the size of the motor, greatly reduces the amount of materials used, greatly reduces labor costs, improves production efficiency, and significantly reduces manufacturing costs.

[0011] 4. Compared with the existing technology, which adds guide channels to the components, this utility model eliminates the welding process and avoids the risk of oil leakage due to poor welding. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the outer rotor magnet ring of this utility model;

[0013] Figure 2 This is a schematic diagram of the magnetic steel ring structure with a U-shaped cross-section in the guide channel of this utility model;

[0014] Figure 3 yes Figure 2 A partially enlarged structural diagram;

[0015] Figure 4 This is a schematic diagram of the magnetic steel ring structure with a through-body cross-section for the guide channel of this utility model;

[0016] Figure 5 yes Figure 4 A partially enlarged structural diagram;

[0017] Figure 6 This is a schematic diagram of the magnetic steel ring structure with a V-shaped cross-section of the guide channel of this utility model;

[0018] Figure 7 yes Figure 6 A partially enlarged structural diagram;

[0019] Figure 8 This is a schematic diagram of the magnetic steel ring structure with a trapezoidal cross-section in the guide channel of this utility model;

[0020] Figure 9 yes Figure 8 A partially enlarged structural diagram;

[0021] Figure 10 This is a schematic diagram of the structure of the magnetic steel ring used in the hub motor of this utility model;

[0022] Figure 11 yes Figure 10 A partially enlarged structural diagram;

[0023] Figure 12 This is a schematic diagram of the cooling oil separation circulation cover structure;

[0024] Figure 13 This is a schematic diagram of the cooling oil separation circulation cover from another direction.

[0025] Figure 14 This is a schematic diagram of the three-dimensional assembly structure of the hub motor of this utility model. Detailed Implementation

[0026] Example 1:

[0027] See Figure 1A magnetic steel ring with a built-in guide groove is described, the key technology of which is that a guide groove 2.1 is opened along the circumferential direction on the inner wall of one side of the outer rotor magnetic steel ring 2. The guide groove 2.1 is 5-25mm wide and 2-6mm deep.

[0028] like Figure 2 , Figure 3 As shown, the cross-sectional shape of the guide channel 2.1 can be a U-shaped structure 2.11, with a width of 5-15 mm and a depth of 2-4 mm.

[0029] like Figure 4 , Figure 5 As shown, the cross-sectional shape of the guide channel 2.1 can be a solid structure 2.12, with a width of 15-25 mm and a depth of 2-6 mm.

[0030] The entire structure, i.e., the width of the guide groove, is the entire width of one side of the outer rotor magnet ring 2.

[0031] like Figure 6 , Figure 7 As shown, the cross-sectional shape of the guide channel 2.1 can be a V-shaped structure 2.13, with a width of 5-15 mm and a depth of 2-4 mm.

[0032] like Figure 8 , Figure 9 As shown, the cross-sectional shape of the guide channel 2.1 can be a trapezoidal structure 2.14, with a width of 5-15 mm and a depth of 2-4 mm.

[0033] The cross-sectional shape of the guide channel 2.1 can also be a semi-circular groove, with a width of 5-15mm and a depth of 2-4mm.

[0034] Example 2:

[0035] See Figures 10-14A hub motor with a magnetic steel ring having its own flow guide groove includes a motor and a hub steel ring 1. The motor includes a motor shaft 6, a stator 11, and an outer rotor magnetic steel ring 2. The hub steel ring 1 is fixedly connected to the outer rotor magnetic steel ring 2. The stator 11 is fixed to the motor shaft 6. The outer rotor magnetic steel ring 2 is fitted onto the stator 11. One end of the outer rotor magnetic steel ring 2 is fixedly connected to the left cover 5 of the motor, and the other end is fixedly connected to the motor drum cover 13. Motor coil windings 9 are arranged on the stator 11. A magnetic steel sheet 10 is provided in the inner ring of the outer rotor magnetic steel ring 2, and the magnetic steel sheet 10 is located between the outer rotor magnetic steel ring 2 and the stator 11. The key technology is that the outer rotor magnetic steel ring 2 has its own flow guide groove. The guide channel 2.1 is located on the inner wall of the outer rotor magnet ring 2 near the left cover 5 of the motor. The cooling oil separation circulation cover 3 is installed inside the left cover 5 of the motor. The space formed by the left cover 5 of the motor, the inner wall of one end of the outer rotor magnet ring 2, the guide channel 2.1, and one side of the cooling oil separation circulation cover 3 constitutes the oil suspension storage circulation cold oil chamber 4. The space formed by the inner wall of the other end of the outer rotor magnet ring 2, the motor drum cover 13, the motor shaft 6, and the other side of the cooling oil separation circulation cover 3 constitutes the motor working chamber 12. The motor working chamber 12 and the oil suspension storage circulation cold oil chamber 4 are interconnected to form a cooling oil circulation heat dissipation system.

[0036] The cooling oil separation circulation cover 3 has several oil drain grooves 3.1 on its circumference.

[0037] The cooling oil separation circulation cover 3 has several oil scooping and pouring blocks 3.2 arranged along the circumference on one side.

[0038] An oil spray hole 3.3 is opened next to each oil scooping block 3.2.

[0039] The center hole 3.4 of the cooling oil separation circulation cover 3 is fitted onto the boss inside the left cover of the motor 5, and is fixedly connected to the boss bolt hole 5.1 inside the left cover of the motor 5 by fixing bolts. During assembly, the oil drain groove 3.1 of the cooling oil separation circulation cover 3 is installed in conjunction with the guide groove 2.1.

[0040] In the diagram, 7 is the motor wire; 8 is the oil sight glass to observe the oil level.

[0041] The working principle of this embodiment is as follows:

[0042] When the vehicle is stationary, the motor does not rotate, and the cooling oil inside the motor is stationary, with the oil level at the spray nozzle 3.3. This allows the lower motor magnet 10, stator 11, and motor coil winding 9 to be immersed in the cooling oil. The amount of cooling oil added is based on a certain ratio according to the capacity of the motor working chamber 12 and the oil suspension storage circulating cooling oil chamber 4. When the vehicle is being ridden, the motor begins to rotate. The cooling oil inside the motor is propelled by the centrifugal force generated when the outer rotor magnet ring 2 rotates, spraying 360 degrees around the circumference onto the motor magnet, stator, and coil winding. It then quickly flows from the motor working chamber 12 through the oil drain trough 3.1 to the guide trough 2.1, and then into the oil suspension storage circulating cooling oil chamber 4 for filling. Because the guide channel 2.1 is set along the circumference of the outer rotor magnet ring 2 and has a certain width and depth, the guide channel has the function of guiding the oil to circulate in the open area of ​​the left cover 5 of the motor, forcing the cooling oil in the air gap 2.0 of the motor to be discharged by the oil drain channel 3.1. There will be no oil resistance in the air gap 2.0 of the motor and the working chamber of the motor. The pressure of the rotating and stirring oil in the motor is effectively released, and the cooling oil in the motor working chamber 12 is reduced instantaneously. When the amount of oil in the oil suspension storage circulating cold oil chamber 4 reaches a certain capacity, the oil is sprayed onto the motor winding 9, stator 11 and magnet 10 in the motor working chamber 12 by the oil scooping and pouring block 3.2 and the oil spraying hole 3.3 under the propulsion of the oil scooping and pouring block for rapid cooling. After absorbing heat, the cooling oil is discharged into the oil suspension storage circulating cold oil chamber 4 through the oil drain channel 3.1 under the action of centrifugal force to fill the next cycle.

Claims

1. A magnetic steel ring with a built-in guide groove, characterized in that: A guide groove (2.1) is opened on the inner wall of one side of the outer rotor magnet ring (2) along the circumferential direction.

2. The magnet ring with built-in guide groove according to claim 1, characterized in that: The width of the guide channel (2.1) is 5-25 mm and the depth is 2-6 mm.

3. The magnet ring with built-in guide groove according to claim 1, characterized in that: The cross-sectional shape of the guide channel (2.1) adopts a U-shaped structure (2.11), a solid structure (2.12), a V-shaped structure (2.13), or a trapezoidal structure (2.14).

4. A hub motor with a magnetic steel ring having a built-in guide groove, comprising a motor and a hub steel ring (1), the motor comprising a motor shaft (6), a stator (11) and an outer rotor magnetic steel ring (2), the hub steel ring (1) being fixedly connected to the outer rotor magnetic steel ring (2), the outer rotor magnetic steel ring (2) being fitted onto the stator (11), one end of the outer rotor magnetic steel ring (2) being fixedly connected to the left cover (5) of the motor, and the other end being fixedly connected to the motor drum cover (13); characterized in that The outer rotor magnet ring (2) has a built-in guide groove (2.1), which is located on the inner wall of the outer rotor magnet ring (2) near the left cover (5) of the motor. A cooling oil separation circulation cover (3) is installed inside the left cover (5) of the motor. The space formed by the left cover (5) of the motor, the inner wall of one end of the outer rotor magnet ring (2), the guide groove (2.1), and the side of the cooling oil separation circulation cover (3) constitutes the oil suspension storage circulation cold oil chamber (4). The space formed by the inner wall of the other end of the outer rotor magnet ring (2), the motor drum cover (13), the motor shaft (6), and the other side of the cooling oil separation circulation cover (3) constitutes the motor working chamber (12). The motor working chamber (12) and the oil suspension storage circulation cold oil chamber (4) are interconnected to form a cooling oil circulation heat dissipation system.

5. The hub motor with a magnet ring having its own guide groove as described in claim 4, characterized in that it has a cooling system... An oil drain groove (3.1) is provided on the circumference of the oil separation circulation cover (3), and the oil drain groove (3.1) is installed in conjunction with the guide groove (2.1).

6. The hub motor with a magnet ring having a built-in guide groove according to claim 4, characterized in that: The cooling oil separation circulation cover (3) has an oil scooping block (3.2) on one side along the circumferential direction.

7. The hub motor with a magnet ring having a built-in guide groove as described in claim 6, characterized in that... An oil spray hole (3.3) is opened next to the oil scooping and pouring block (3.2).

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