Motor with cooling chamber and double-chamber structure and hub motor with the structure

Abstract

Motor double-chamber structure with cooling chamber and hub motor with the structure belong to wheel power transmission technical field, especially relate to wheel power transmission device of electric motorcycle and electric bicycle. Including it is in the side of magnetic conductive circle and adds a extension, motor left cover is installed in the end of the extension, magnetic conductive circle, motor left cover and motor right cover are enclosed and constitute motor chamber, oil pump cover is installed at the end face of magnetic steel sheet in the extension of magnetic conductive circle in motor chamber, the extension of magnetic conductive circle, motor left cover and oil pump cover are enclosed and constitute cooling chamber, or the depth of conventional motor end cover is increased to obtain the cooling chamber, magnetic conductive circle, motor right cover and oil pump cover are enclosed and constitute motor working chamber, cooling chamber and motor working chamber constitute cooling oil circulation cooling system. The utility model has the beneficial effects that: without changing motor main structure and shape, without increasing parts and components, the motor double-chamber with cooling chamber is creatively designed. Have the effect of forced cooling.

Description

Technical Field

[0001] The dual-chamber structure of the motor with its own cooling chamber and the hub motor with this structure 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] Existing oil-cooled motors for electric vehicles have a single-chamber motor chamber. During operation, the oil can only be agitated within this single chamber, preventing effective drainage of oil from the motor's air gap. This oil, combined with the splashing liquid from the agitation, creates oil resistance. The rotational resistance generated by this oil resistance leads to increased power consumption, reduced motor performance, and consequently, a shorter driving range for the electric vehicle. As the motor operates, the temperature rises, quickly generating thermal expansion gas pressure within the single-chamber space. This pressure, combined with the pressure from the splashing liquid, causes oil to leak out along with the gas, resulting in oil spillage and leakage, and ultimately, energy waste. To solve this problem, the specification of "An integrated cover for a hub motor and a hub motor with the integrated cover" published by patent number ZL202121834110.X, on page 2, embodiment 2, describes: "The other end of the outer rotor 2 of the motor is snapped onto the cover body 3 through the motor rotor positioning slot 3.6.1. The bolt passes through the through hole 3.9 on the first convex ring 3.6 to fix the cover body 3 and the outer rotor 2 of the motor. The left side of the cover body 3 is fixedly installed with the circulating heat sink 5 through the second convex ring 3.4 and the threaded hole 3.8 on the second convex ring. The space formed by the cover body 3 and the circulating heat sink 5 constitutes the circulating cooling chamber 4. The space formed after the cover body 3, the right cover 12 of the motor and the outer rotor 2 of the motor are fixedly connected constitutes the motor working chamber 11. The motor working chamber 11 and the circulating cooling chamber 4 constitute a cooling oil heat dissipation circulation system." The cooling chamber effectively releases the pressure of the rotating and agitating oil inside the motor, achieving oil circulation and cooling while easily draining the oil from the motor's air gap. This prevents oil resistance in the 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 it requires modifying the motor structure and adding components to accommodate the cooling chamber, resulting in a complex structure, numerous manufacturing processes, and consequently, higher manufacturing costs. Summary of the Invention

[0003] The problem this utility model aims to solve is to provide a structure that allows for the creation of a secondary chamber besides the motor working chamber without altering the motor structure or adding any components, and a hub motor with this structure. The technical solution is as follows:

[0004] A dual-chamber structure for a motor with a built-in cooling chamber includes a hub steel ring, a magnetic ring, a left motor cover, and a right motor cover. A magnetic steel sheet is provided within the inner ring of the magnetic ring. The hub steel ring is fixedly connected to the magnetic ring. The left motor cover is installed on one side of the magnetic ring, and the right motor cover is installed on the other side. The key technology involves adding an extension section to one side of the magnetic ring. The left motor cover is installed at the end of this extension section. The magnetic ring, left motor cover, and right motor cover together form the motor cavity. An oil pump cover is installed inside the motor cavity at the end face of the magnetic steel sheet located at the extension section of the magnetic ring. The extension section of the magnetic ring, the left motor cover, and the oil pump cover together form the cooling chamber. Alternatively, a self-contained cooling chamber can be obtained by increasing the depth of a conventional motor end cover. The magnetic ring, right motor cover, and oil pump cover together form the motor working chamber. The cooling chamber and the motor working chamber together constitute a cooling oil circulation and heat dissipation system.

[0005] The aforementioned dual-chamber hub motor with its own cooling chamber houses a stator assembly within its working chamber. The stator assembly includes a stator fixed to the motor shaft, a magnetic ring fitted onto the stator, and motor coil windings arranged on the stator. A magnet is positioned between the magnetic ring and the stator. A key technology involves adding an extension section to one side of the magnetic ring. A left motor cover is installed at the end of this extension section. The magnetic ring, left motor cover, and right motor cover together form the motor cavity. An oil pump cover is installed at the end face of the magnet located at the extension section of the magnetic ring within the motor cavity. The extension section of the magnetic ring, the left motor cover, and the oil pump cover together form the cooling chamber. Alternatively, a self-contained cooling chamber can be obtained by increasing the depth of a conventional motor end cover. The magnetic ring, right motor cover, and oil pump cover together form the motor working chamber.

[0006] Compared with the prior art, the present invention has the following beneficial effects:

[0007] 1. This utility model creatively designs a dual-chamber motor with a built-in cooling chamber without altering the main structure and shape of the motor or adding any components. This structure is achieved by simply increasing the width of the magnetic coil side of a conventional motor, or by increasing the depth of the end cover of a conventional motor, to create a built-in cooling chamber that, together with the motor's working chamber, forms a dual-chamber motor body. As the vehicle is ridden and the motor rotates, this built-in cooling chamber becomes a "rotational cooling" chamber, and rotational cooling is the best cooling method, providing a forced cooling effect.

[0008] 2. The oil pump cover acts as a barrier between the cooling chamber and the motor working chamber, thus forming an independent dual-chamber motor. When the motor is working, the oil is fully and forcibly cooled in the cooling chamber and then quickly cooled down. It is then circulated back to the motor working chamber to carry away the heat and release it into the air, so that the motor is always working in the best condition.

[0009] 3. When working in combination with the oil pump cover, the oil in the motor air gap and motor chamber will circulate and be discharged to the cooling chamber. The oil will not be retained in the motor air gap, but will be discharged smoothly. There will be no oil resistance in the motor air gap and motor chamber. 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.

[0010] 4. This utility model does not change the main structure and shape of the motor, does not require the addition of parts, simplifies the manufacturing process and assembly procedures, optimizes the overall structure of the existing oil-cooled motor, reduces the motor volume, significantly reduces the amount of materials used, significantly reduces labor costs, improves production efficiency, and significantly reduces manufacturing costs.

[0011] 5. Compared with the existing technology, which requires adding parts and changing the main structure to set up a cooling chamber, this utility model only adds a small amount of size to the original to obtain a cooling chamber, eliminating all welding processes in manufacturing the cooling chamber, reducing the assembly sealing surfaces, and avoiding the risk of oil leakage due to poor welding and sealing.

[0012] 6. To demonstrate the cooling effect of this utility model, a comparative climbing test was conducted on June 13, 2025, on both existing motors and the motor of this utility model (with the same power and model) under the same conditions of a steep slope of 1.35 kilometers each and an outdoor temperature of 34°C:

[0013]

[0014] It has been proven that the built-in cooling chamber's "rotational forced cooling oil temperature" directly reduces the coil temperature. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the dual-chamber structure of the motor with a built-in cooling chamber of this utility model;

[0016] Figure 2 This is a three-dimensional structural diagram of the left cover of the motor of this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the oil pump cover of this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the oil pump cover of this utility model from another direction;

[0019] Figure 5 This is a schematic diagram of the three-dimensional structure of the magnetic coil of this utility model;

[0020] Figure 6 This is a schematic diagram of the hub motor structure with the cooling chamber of this utility model;

[0021] Figure 7 yes Figure 6 A partially enlarged structural diagram;

[0022] Figure 8 This is another structural schematic diagram of the dual-chamber motor with built-in cooling chamber of this utility model;

[0023] Figure 9 This is a three-dimensional structural diagram of another structure of the left cover of the motor of this utility model;

[0024] Figure 10 This is another structural schematic diagram of the hub motor with the cooling chamber of this utility model;

[0025] Figure 11 yes Figure 10 A partially enlarged structural diagram. Detailed Implementation

[0026] Example 1:

[0027] See Figures 1-5 A dual-chamber structure for a motor with a built-in cooling chamber includes a hub steel ring 1, a magnetic ring 2, a left motor cover 6, and a right motor cover 13. A magnetic steel sheet 3 is provided within the inner ring of the magnetic ring 2. The hub steel ring 1 is welded and fixed to the magnetic ring 2. The left motor cover 6 is fixedly installed on one side of the magnetic ring 2, and the right motor cover 13 is fixedly installed on the other side. The key technology involves adding an extension section 2.1 to one side of the magnetic ring 2. The left motor cover 6 is installed at the end of this extension section 2.1. The magnetic ring 2, the left motor cover 6, and the right motor cover 13 together form the motor cavity. An oil pump cover 4 is installed inside the motor cavity at the end face 3.1 of the magnetic steel sheet located at the extension section 2.1 of the magnetic ring. The extension section 2.1 of the magnetic ring, the left motor cover 6, and the oil pump cover 4 together form a cooling chamber 5. The magnetic ring 2, the right motor cover 13, and the oil pump cover 4 together form a motor working chamber 12. Thus, the oil pump cover 4 separates the motor cavity, forming independent dual-chamber motor chambers: the cooling chamber 5 and the motor working chamber 12. The oil pump cover 4 is a thin sheet metal stamping part (with a certain degree of elasticity), which does not require casting or precision machining, resulting in low manufacturing costs.

[0028] The specific width of the extended section 2.1 of the magnetic coil depends on the power of the motor, and is generally 6 to 40 mm.

[0029] The distance between the outer wall 4.1 of the oil pump cover 4 and the inner wall 6.1 of the left cover 6 of the motor is 2 to 35 mm.

[0030] A flow-blocking positioning ring 4.6 is provided on the circumference of the oil pump cover 4. The flow-blocking positioning ring is formed by folding the circumferential edge of the oil pump cover 4. A second boss 4.3 is provided on one side of the oil pump cover 4, and a central hole 4.4 is opened on the second boss 4.3. A first boss 6.2 is provided outside the central bearing hole of the motor left cover 6. The flow-blocking positioning ring 4.6 is directly embedded in the magnetic ring 2 and abuts against the left end face 3.1 of the magnetic steel sheet. The first boss 6.2 and the second boss 4.3 are pressed together, thereby achieving the purpose of center positioning of the oil pump cover 4 and also achieving the purpose of screwless assembly of the oil pump cover 4. The two boss planes have the function of blocking oil and sealing under pressure.

[0031] An oil outlet hole 4.2 is provided on the edge of the oil pump cover 4, and an oil inlet hole 4.5 is provided between the edge of the oil pump cover 4 and the center hole 4.4. A flow-blocking positioning ring 4.6 is used to prevent the oil from flowing freely between the cooling chamber 5 and the motor working chamber 12, and thus, under the action of centrifugal force, the oil is limited to circulate through the oil inlet hole 4.5 and the oil outlet hole 4.2 of the oil pump cover 4.

[0032] Example 2:

[0033] like Figure 6 , 7 As shown, a dual-chamber hub motor with a built-in cooling chamber consists of a motor stator assembly housed within a motor working chamber 12. The stator assembly includes a stator 11 fixed to a motor shaft 7, a magnetic coil 2 mounted on the stator 11, and motor coil windings 10 arranged on the stator 11. A magnet 3 is located between the magnetic coil 2 and the stator 11. A key technology involves adding an extension section 2.1 to one side of the magnetic coil 2. The left motor cover 6 is installed at the end of this extension section 2.1. The left motor cover 6 and the right motor cover 13 together form the motor cavity. Inside the motor cavity, at the end face 3.1 of the magnet at the extension section 2.1 of the magnetic coil, the extension section 2.1 of the magnetic coil, the left motor cover 6 and the oil pump cover 4 together form the cooling chamber 5. The magnetic coil 2, the right motor cover 13 and the oil pump cover 4 together form the motor working chamber 12. The cooling chamber 5 and the motor working chamber 12 are interconnected through the oil inlet hole 4.5 and the oil outlet hole 4.2 to form a cooling oil circulation and heat dissipation system.

[0034] In the diagram, 8 is the motor wire; 9 is the oil sight glass to observe the oil level.

[0035] The working principle of a dual-chamber hub motor with its own cooling chamber is as follows:

[0036] When the vehicle is stationary, the motor does not rotate, and the cooling oil inside the motor is stationary, with the oil level approximately at the oil inlet 4.5. This allows the lower motor magnet 3, stator 11, and motor coil winding 10 to be immersed in the cooling oil. The amount of cooling oil added is proportional to the capacity of the motor working chamber 12 and the cooling chamber 5. When the vehicle is being ridden, the motor begins to rotate. At this time, the cooling oil inside the motor working chamber, including the oil pump cover, is activated by the centrifugal force generated by the rotation of the magnetic ring 2. The oil pump cover 4 sprays oil 360 degrees around the circumference of the motor magnet 3, stator 11, and motor coil winding 10, and then quickly drains and fills the cooling chamber 5 through the oil outlet 4.2 from the motor working chamber 12. Simultaneously, the pressure of the rotating and agitating oil inside the motor working chamber is effectively released, and the amount of cooling oil in the motor working chamber 12 decreases instantaneously. When the oil in the cooling chamber 5 reaches a certain capacity, it is sprayed through the oil inlet 4.5 onto the motor windings 10, stator 11, and motor magnets 3 in the motor working chamber 12 for rapid cooling. The cooled oil, after absorbing heat, is discharged back into the cooling chamber 5 through the oil outlet 4.2 under the action of centrifugal force, and enters the next cycle process. This process continuously discharges the cooled oil from the motor working chamber 12 to achieve circulating cooling.

[0037] Example 3:

[0038] See Figure 8 , Figure 9 A dual-chamber structure for a motor with a built-in cooling chamber includes a hub steel ring 1, a magnetic guide ring 2, a left motor cover 6, and a right motor cover 13. The inner ring of the magnetic guide ring 2 is equipped with a magnetic steel sheet 3. The hub steel ring 1 is welded and fixedly connected to the magnetic guide ring 2. The left motor cover 6 is fixedly installed on one side of the magnetic guide ring 2, and the right motor cover 13 is fixedly installed on the other side. The key technology is that the depth between the stop surface 6.3 and the inner wall 6.1 of the left motor cover 6 is increased to 18-45 mm. The motor cavity is formed by the three enclosures. Inside the motor cavity, the oil pump cover 4 is installed at the end face 3.1 of the magnet plate. The left cover 6 of the motor and the oil pump cover 4 together form the cooling chamber 5. The magnetic ring 2, the right cover 13 of the motor and the oil pump cover 4 together form the motor working chamber 12. Thus, the oil pump cover 4 separates the motor cavity to form two independent motor chambers, namely the cooling chamber 5 and the motor working chamber 12. The cooling chamber 5 and the motor working chamber 12 are interconnected through the oil inlet hole 4.5 and the oil outlet hole 4.2 to form a cooling oil circulation and heat dissipation system.

[0039] Example 4:

[0040] like Figure 10 , 11As shown, a dual-chamber hub motor with a built-in cooling chamber consists of a motor stator assembly housed within a motor working chamber 12. The motor stator assembly includes a stator 11 fixed to a motor shaft 7, a magnetic ring 2 fitted onto the stator 11, motor coil windings 10 arranged on the stator 11, and a magnet 3 located between the magnetic ring 2 and the stator 11. The key technology is that the depth between the stop surface 6.3 of the left motor cover 6 and the inner wall 6.1 of the left motor cover is increased to 18-45 mm. The magnetic ring 2, the left motor cover 6, and the right motor cover 13 together form the motor cavity. An oil pump cover 4 is installed inside the motor cavity at the end face 3.1 of the magnet 3.1. The left motor cover 6 and the oil pump cover 4 together form a cooling chamber 5, and the magnetic ring 2, the right motor cover 13, and the oil pump cover 4 together form the motor working chamber 12.

[0041] The working principle of the dual-chamber hub motor with its own cooling chamber is the same as that of Example 1, and will not be repeated here.

Claims

1. A dual-chamber structure for a motor with a built-in cooling chamber, comprising a hub steel ring (1), a magnetic ring (2), a left motor cover (6), and a right motor cover (13), wherein a magnetic steel sheet (3) is provided on the inner ring of the magnetic ring (2), the hub steel ring (1) is fixedly connected to the magnetic ring (2), the left motor cover (6) is installed on one side of the magnetic ring (2), and the right motor cover (13) is installed on the other side; characterized in that An extension section (2.1) is added to one side of the magnetic ring (2). The left cover (6) of the motor is installed at the end of the extension section (2.1). The magnetic ring (2), the left cover (6) of the motor and the right cover (13) of the motor together form the motor cavity. The oil pump cover (4) is installed at the end face (3.1) of the magnet at the extension section (2.1) of the magnetic ring inside the motor cavity. The extension section (2.1), the left cover (6) of the motor and the oil pump cover (4) together form the cooling chamber (5). The magnetic ring (2), the right cover (13) of the motor and the oil pump cover (4) together form the motor working chamber (12). The cooling chamber (5) and the motor working chamber (12) together form the cooling oil circulation heat dissipation system.

2. The dual-chamber structure of the motor with its own cooling chamber as described in claim 1, characterized in that: The width of the extended section (2.1) of the magnetic coil is 6 to 40 mm.

3. The dual-chamber structure of the motor with its own cooling chamber as described in claim 1, characterized in that: The distance between the outer wall (4.1) of the oil pump cover (4) and the inner wall (6.1) of the left cover (6) of the motor is 2 to 35 mm.

4. The dual-chamber structure of the motor with its own cooling chamber as described in claim 1, characterized in that... A flow-blocking positioning ring (4.6) is provided on the circumference of the oil pump cover (4). A second boss (4.3) is provided on one side of the oil pump cover (4). A central hole (4.4) is opened on the second boss (4.3). A first boss (6.2) is provided outside the central bearing hole of the motor left cover (6). The flow-blocking positioning ring (4.6) is embedded in the magnetic ring (2) and abuts against the left end face (3.1) of the magnetic steel sheet. The first boss (6.2) and the second boss (4.3) are pressed together.

5. The dual-chamber structure of the motor with its own cooling chamber according to claim 1, characterized in that... The oil pump cover (4) has an oil outlet hole (4.2) on its edge and an oil inlet hole (4.5) between the edge of the oil pump cover (4) and the center hole (4.4).

6. A dual-chamber hub motor with its own cooling chamber, wherein a motor stator assembly is installed inside the motor working chamber (12), the motor stator assembly includes a stator (11) fixed on the motor shaft (7), a magnetic coil (2) is installed on the stator (11), motor coil windings (10) are arranged on the stator (11), and a magnet (3) is located between the magnetic coil (2) and the stator (11); characterized in that An extension section (2.1) is added to one side of the magnetic ring (2). The left cover (6) of the motor is installed at the end of the extension section (2.1). The magnetic ring (2), the left cover (6) of the motor and the right cover (13) of the motor together form the motor cavity. The oil pump cover (4) is installed at the end face (3.1) of the magnet at the extension section (2.1) of the magnetic ring inside the motor cavity. The extension section (2.1), the left cover (6) of the motor and the oil pump cover (4) together form the cooling chamber (5). The magnetic ring (2), the right cover (13) of the motor and the oil pump cover (4) together form the motor working chamber (12).

7. A dual-chamber structure for a motor with a built-in cooling chamber, comprising a hub steel ring (1), a magnetic ring (2), a left motor cover (6), and a right motor cover (13), wherein the inner ring of the magnetic ring (2) is provided with a magnetic steel sheet (3), the hub steel ring (1) is welded and fixedly connected to the magnetic ring (2), the left motor cover (6) is fixedly installed on one side of the magnetic ring (2), and the right motor cover (13) is fixedly installed on the other side; characterized in that The depth between the stop surface (6.3) of the left cover (6) of the motor and the inner wall (6.1) of the left cover of the motor is increased to 18-45 mm. The magnetic ring (2), the left cover (6) of the motor and the right cover (13) of the motor together form the motor cavity. The oil pump cover (4) is installed in the motor cavity at the end face (3.1) of the magnet plate. The left cover (6) of the motor and the oil pump cover (4) together form the cooling chamber (5). The magnetic ring (2), the right cover (13) of the motor and the oil pump cover (4) together form the motor working chamber (12). The cooling chamber (5) and the motor working chamber (12) together form the cooling oil circulation heat dissipation system.

8. A dual-chamber hub motor with its own cooling chamber, wherein a motor stator assembly is installed inside the motor working chamber (12), the motor stator assembly includes a stator (11) fixed on the motor shaft (7), a magnetic coil (2) is installed on the stator (11), motor coil windings (10) are arranged on the stator (11), and a magnet (3) is located between the magnetic coil (2) and the stator (11); characterized in that The depth between the stop surface (6.3) of the left cover (6) of the motor and the inner wall (6.1) of the left cover of the motor is increased to 18-45 mm. The magnetic ring (2), the left cover (6) of the motor and the right cover (13) of the motor together form the motor cavity. The oil pump cover (4) is installed in the motor cavity at the end face (3.1) of the magnet plate. The left cover (6) of the motor and the oil pump cover (4) together form the cooling chamber (5). The magnetic ring (2), the right cover (13) of the motor and the oil pump cover (4) together form the motor working chamber (12).

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