Motor and electrically assisted bicycle

Abstract

The utility model belongs to electric motor car technical field discloses a motor and electric power-assisted vehicle, the motor includes first end cover, second end cover, stator, rotor, motor shaft and heat dissipation system, first end cover and second end cover rotationally cover and set up on motor shaft, rotor is fixed between first end cover and second end cover, first end cover, rotor and second end cover form inner chamber together, inner chamber is equipped with insulating oil, stator is located in inner chamber, motor shaft is in turn provided first end cover, stator and second end cover, motor shaft is solidly connected with stator, and is rotationally connected with first end cover and second end cover, and heat dissipation system includes connecting pipe and gas exchanger, and the gas exchanger has exchange cavity and the air hole that communicates exchange cavity, and the connecting pipe one end is located in the inner chamber, and the other end stretches out in the inner chamber and communicates exchange cavity, electric power-assisted vehicle includes above -mentioned motor. The motor can effectively discharge the heat inside the motor, and the internal insulating oil is heat dissipated, ensures the reliable performance of electric power-assisted vehicle travel.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, and in particular to a motor and an electric-assisted bicycle. Background Technology

[0002] In urban transportation systems, electric-assisted bicycles have become an indispensable tool for short-distance travel. As the core driving force of the vehicle, the performance of the electric motor is particularly important in the vehicle's configuration.

[0003] Electric bicycles use an electric motor as the main power output component. During high-speed operation, the internal temperature of the motor increases dramatically. This temperature rise directly affects its efficiency, reliability, and lifespan, especially in enclosed or high-temperature environments where heat dissipation becomes more challenging. Existing technologies utilize cooling structures such as cold plates and heat sinks, along with the insulating oil inside the motor, to achieve heat dissipation. However, these methods have limited effectiveness in cooling the high-temperature, enclosed internal environment of the motor. Furthermore, prolonged operation can cause the internal insulating oil temperature to rise, reducing its heat exchange capacity and impacting the motor's efficiency, reliability, and lifespan. Utility Model Content

[0004] The purpose of this invention is to provide a motor that can effectively dissipate heat from inside the motor and effectively cool the internal insulating oil.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An electric motor includes a first end cover, a second end cover, a stator, a rotor, a motor shaft, and a heat dissipation system.

[0007] The first end cover and the second end cover are sleeved on the motor shaft and rotatably connected to the motor shaft. The rotor is fixed between the first end cover and the second end cover. The first end cover, the rotor, and the second end cover together form an inner cavity. The inner cavity is provided with insulating oil for lubrication and heat dissipation. The stator is located in the inner cavity. The motor shaft passes through the first end cover, the stator, and the second end cover in sequence. The motor shaft is fixedly connected to the stator and rotatably connected to the first end cover and the second end cover.

[0008] The heat dissipation system includes a connecting pipe and a gas exchanger. The gas exchanger has an exchange chamber and an air vent communicating with the exchange chamber. The first end of the connecting pipe is located inside the inner cavity, and the second end of the connecting pipe extends out of the inner cavity and communicates with the exchange chamber.

[0009] Preferably, the gas exchanger has an upper connection portion and a lower connection portion connected to each other, the upper connection portion and the lower connection portion together enclosing the exchange cavity, and the upper connection portion having a plurality of air holes.

[0010] Preferably, a sealing ring is provided between the upper connecting part and the lower connecting part.

[0011] Preferably, the connecting pipe is a flexible tube.

[0012] Preferably, the system also includes a controller, which is fixedly disposed within the inner cavity and fixed to one side of the stator. The controller has multiple heat dissipation teeth protruding from its surface facing away from the stator.

[0013] Preferably, the heat dissipation teeth are provided in multiple sets, and the multiple sets of heat dissipation teeth are spaced apart along the axial direction of the motor shaft. Each set has multiple heat dissipation teeth, and the multiple heat dissipation teeth in each set are spaced apart along the radial direction of the motor shaft.

[0014] Preferably, the controller is sleeved on the motor shaft and fixedly connected to the stator.

[0015] Preferably, a fixing seat is fixedly provided in the inner cavity, the first end of the connecting pipe is fixed on the fixing seat, and the lower end surface of the fixing seat is higher than the liquid level of the insulating oil in the inner cavity.

[0016] Preferably, the motor shaft has a through hole, and the connecting pipe passes through the through hole.

[0017] This utility model also provides an electric-assisted bicycle, which includes the aforementioned motor, and can effectively dissipate heat from inside the motor and effectively cool the internal insulating oil, ensuring the reliable performance of the electric-assisted bicycle.

[0018] An electric-assisted bicycle includes a motor as described in any of the above claims, and also includes a frame, wherein the motor shaft and the gas exchanger are both fixedly mounted on the frame.

[0019] Beneficial effects:

[0020] The motor provided by this utility model is equipped with a heat dissipation system, which includes a gas exchanger and a connecting pipe. The gas exchanger is located outside the inner cavity, and the first end of the connecting pipe is located inside the inner cavity, while the second end extends out of the inner cavity and connects to the exchange chamber of the gas exchanger. During the process of gas discharge from the inner cavity, the pressure inside the cavity increases, causing the gas inside the cavity to mix with some of the insulating oil inside the cavity and enter the connecting pipe. This mixture then enters the exchange chamber, where the gas carrying heat is discharged through the vent to the external environment, and the insulating oil entering the exchange chamber is cooled by being removed from the high-temperature environment inside the cavity, thus dissipating heat from the insulating oil. During the process of gas intake from the inner cavity, the pressure inside the cavity decreases, and low-temperature gas from the outside is drawn into the exchange chamber through the vent and enters the inner cavity through the connecting pipe. Simultaneously, the insulating oil cooled by heat in the exchange chamber returns to the inner cavity through the connecting pipe. This motor can effectively dissipate heat from inside the motor and effectively dissipate heat from the internal insulating oil, preventing overheating and ensuring reliable and stable motor operation.

[0021] The electric-assisted bicycle provided by this utility model includes the aforementioned motor. The internal heat of the motor can be effectively dissipated, and the insulating oil inside the motor can achieve intermittent cooling, preventing overheating of the motor and ensuring reliable and stable operation of the motor, thus guaranteeing the reliability and stability of the electric-assisted bicycle's driving power. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the motor provided by this utility model;

[0023] Figure 2 This is an exploded schematic diagram of the motor provided by this utility model;

[0024] Figure 3 This is a schematic diagram of the heat dissipation system for the motor provided by this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the motor controller provided by this utility model.

[0026] In the picture:

[0027] 101. Inner cavity; 11. First end cap; 12. Second end cap;

[0028] 2. Stator;

[0029] 3. Rotor;

[0030] 4. Motor shaft; 41. Through hole;

[0031] 5. Connecting pipe; 51. Collection pipe head;

[0032] 6. Gas exchanger; 601. Exchange chamber; 61. Upper connection part; 611. Air vent; 62. Lower connection part; 63. Sealing ring;

[0033] 7. Controller; 71. Heat dissipation fins;

[0034] 8. Fixture. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] This embodiment provides a motor. (Refer to...) Figures 1 to 4As shown, the motor includes a first end cover 11, a second end cover 12, a stator 2, a rotor 3, a motor shaft 4, and a heat dissipation system. The first end cover 11 and the second end cover 12 are fitted onto the motor shaft 4 and rotatably connected to it. The rotor 3 is fixed between the first end cover 11 and the second end cover 12. The first end cover 11, the rotor 3, and the second end cover 12 together form an inner cavity 101, which contains insulating oil for lubrication and heat dissipation. The stator 2 is located within the inner cavity 101. The motor shaft 4 passes through the first end cover 11, the stator 2, and the second end cover 12 in sequence. The motor shaft 4 is fixedly connected to the stator 2 and rotatably connected to the first end cover 11 and the second end cover 12. The heat dissipation system includes a connecting pipe 5 and a gas exchanger 6. The gas exchanger 6 has an exchange chamber 601 and vents 611 communicating with the exchange chamber 601. The first end of the connecting pipe 5 is located within the inner cavity 101, and the second end of the connecting pipe 5 extends out of the inner cavity 101 and communicates with the exchange chamber 601.

[0040] Specifically, the vent 611 connects to the external environment. The gas exchanger 6 is located outside the inner cavity 101.

[0041] During the process of gas discharge from the inner cavity 101, the pressure in the inner cavity 101 increases, causing the gas inside the inner cavity 101, mixed with some of the insulating oil, to enter the connecting pipe 5 and then into the exchange chamber 601. The gas inside the inner cavity 101, carrying heat, is discharged to the external environment through the vent 611, while the insulating oil entering the exchange chamber 601 is cooled by being removed from the high-temperature environment of the inner cavity 101, thus dissipating heat. During the process of gas intake from the inner cavity 101, the pressure in the inner cavity 101 decreases, and low-temperature gas from the outside is drawn into the exchange chamber 601 through the vent 611 and enters the inner cavity 101 through the connecting pipe 5. Simultaneously, the insulating oil that has cooled down in the exchange chamber 601 returns to the inner cavity 101 through the connecting pipe 5. This motor effectively dissipates internal heat and effectively cools the internal insulating oil, preventing overheating and ensuring reliable and stable motor operation.

[0042] In this embodiment, the gas exchanger 6 has an upper connecting portion 61 and a lower connecting portion 62 connected to each other. The upper connecting portion 61 and the lower connecting portion 62 together enclose an exchange cavity 601. The upper connecting portion 61 has a plurality of air holes 611. Specifically, refer to... Figure 3 As shown, the gas inside the inner cavity 101, mixed with some of the insulating oil, enters the exchange chamber 601. The high-temperature gas flows from the direction of the arrow, passes through the vent 611, and is eventually discharged to the external environment, while the insulating oil continues to dissipate heat within the exchange chamber 601. Specifically, the first end of the connecting pipe 5 is provided with a collecting pipe head 51, through which the high-temperature gas and insulating oil inside the inner cavity 101 can enter.

[0043] As an optional implementation, a waterproof and breathable membrane is provided between the exchange chamber 601 and the vent 611. The waterproof and breathable membrane can further prevent the insulating oil in the exchange chamber 601 from accidentally entering the vent 611 and being discharged.

[0044] Specifically, the upper connecting part 61 and the lower connecting part 62 are installed and fixed by a threaded connection. The upper connecting part 61 is provided with an internal thread, and the lower connecting part 62 is provided with an external thread. The upper connecting part 61 is screwed into the lower connecting part 62 to achieve the fit of the internal and external threads, thereby fixing the upper connecting part 61 and the lower connecting part 62.

[0045] Furthermore, a sealing ring 63 is provided between the upper connecting part 61 and the lower connecting part 62. The sealing ring 63 can further seal the gap between the upper connecting part 61 and the lower connecting part 62, preventing the insulating oil in the exchange chamber 601 from leaking out.

[0046] Optionally, the sealing ring 63 may be made of rubber.

[0047] In this embodiment, the connecting pipe 5 is configured as a flexible hose. This configuration allows the connecting pipe 5 to be easily moved, enabling flexible installation of the heat dissipation system, facilitating assembly and disassembly, and enhancing its practicality.

[0048] Optionally, the connecting pipe 5 may be made of soft rubber tubing.

[0049] In this embodiment, the motor also includes a controller 7, which is fixedly disposed within the inner cavity 101 and fixed to one side of the stator 2. Multiple heat dissipation teeth 71 protrude from the surface of the controller 7 facing away from the stator 2. Specifically, the controller 7 is used to control the operation of the motor, specifically to control the rotation of the rotor 3. Specifically, by providing heat dissipation teeth 71 on the controller 7, the contact area between the outer surface of the controller 7 and the insulating oil is increased. When the insulating oil contacts the controller 7, it can also dissipate the heat generated by the controller 7, allowing the controller 7 to remain within a high-efficiency operating range.

[0050] Furthermore, multiple sets of heat dissipation teeth 71 are provided, with these sets spaced apart along the axial direction of the motor shaft 4. Each set contains multiple heat dissipation teeth 71, which are also spaced apart along the radial direction of the motor shaft 4. This arrangement increases the contact area between the outer surface of the controller 7 and the insulating oil, while reducing the resistance caused by the insulating oil within the inner cavity 101, thus ensuring reliable flow of the insulating oil.

[0051] In this embodiment, the controller 7 is mounted on the motor shaft 4 and fixedly connected to the stator 2. Specifically, the controller 7 and the stator 2 can be fixedly connected by bolts, screws, or other connecting parts.

[0052] In this embodiment, a fixing seat 8 is fixedly installed inside the inner cavity 101. The first end of the connecting pipe 5 is fixed to the fixing seat 8, and the lower end surface of the fixing seat 8 is higher than the liquid level of the insulating oil in the inner cavity 101. Specifically, the fixing seat 8 can reliably fix the first end of the connecting pipe 5. By setting the lower end surface of the fixing seat 8 to be higher than the liquid level of the insulating oil in the inner cavity 101, the first end of the connecting pipe 5 fixed to the fixing seat 8 can also be located on the liquid level of the insulating oil, preventing the first end of the connecting pipe 5 from being immersed in the liquid level of the insulating oil. During the gas discharge process, the high-temperature gas in the inner cavity 101 is discharged first, and then some of the insulating oil is also discharged under the action of negative pressure, reducing the priority discharge of insulating oil.

[0053] Alternatively, the mounting base 8 can be configured as a separate component or as part of the housing of the controller 7.

[0054] In this embodiment, the motor shaft 4 has a through hole 41, and the connecting pipe 5 passes through the through hole 41. Specifically, the second end of the connecting pipe 5 passes through the through hole 41 and extends out of the inner cavity 101.

[0055] Specifically, the motor shaft 4 is provided with a first bearing and a second bearing, the first end cover 11 is rotatably connected to the motor shaft 4 through the first bearing, and the second end cover 12 is rotatably connected to the motor shaft 4 through the second bearing.

[0056] This embodiment also provides an electric-assisted bicycle. The electric-assisted bicycle includes the motor described above, and also includes a frame (not shown). The motor shaft 4 and the gas exchanger 6 are both fixedly mounted on the frame. By applying the motor described above to the electric-assisted bicycle, all the beneficial effects of the motor can be achieved, namely, the internal heat of the motor can be effectively dissipated, and the insulating oil inside the motor can achieve intermittent cooling, avoiding overheating of the motor, ensuring reliable and stable motor operation, and guaranteeing the reliability and stability of the electric-assisted bicycle's driving power.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An electric motor, characterized in that, It includes a first end cover (11), a second end cover (12), a stator (2), a rotor (3), a motor shaft (4), and a heat dissipation system; The first end cover (11) and the second end cover (12) are sleeved on the motor shaft (4) and rotatably connected to the motor shaft (4). The rotor (3) is fixed between the first end cover (11) and the second end cover (12). The first end cover (11), the rotor (3) and the second end cover (12) together form an inner cavity (101). The inner cavity (101) is provided with insulating oil for lubrication and heat dissipation. The stator (2) is located in the inner cavity (101). The motor shaft (4) passes through the first end cover (11), the stator (2) and the second end cover (12) in sequence. The motor shaft (4) is fixedly connected to the stator (2) and rotatably connected to the first end cover (11) and the second end cover (12). The heat dissipation system includes a connecting pipe (5) and a gas exchanger (6). The gas exchanger (6) has an exchange chamber (601) and an air hole (611) communicating with the exchange chamber (601). The first end of the connecting pipe (5) is located inside the inner cavity (101), and the second end (4) of the connecting pipe (5) extends out of the inner cavity (101) and communicates with the exchange chamber (601).

2. The motor according to claim 1, characterized in that, The gas exchanger (6) has an upper connecting part (61) and a lower connecting part (62) connected to each other. The upper connecting part (61) and the lower connecting part (62) together enclose the exchange cavity (601). The upper connecting part (61) has a plurality of air holes (611).

3. The motor according to claim 2, characterized in that, A sealing ring (63) is provided between the upper connecting part (61) and the lower connecting part (62).

4. The motor according to claim 1, characterized in that, The connecting pipe (5) is configured as a flexible hose.

5. The motor according to claim 1, characterized in that, It also includes a controller (7), which is fixedly disposed in the inner cavity (101) and fixed to one side of the stator (2). The controller (7) has a plurality of heat dissipation teeth (71) protruding from the surface of the side of the controller (7) facing away from the stator (2).

6. The motor according to claim 5, characterized in that, The heat dissipation teeth (71) are provided in multiple sets, and the multiple sets of heat dissipation teeth (71) are spaced apart along the axial direction of the motor shaft (4). Each set of heat dissipation teeth (71) has multiple quantities, and the multiple heat dissipation teeth (71) in each set are spaced apart along the radial direction of the motor shaft (4).

7. The motor according to claim 5, characterized in that, The controller (7) is mounted on the motor shaft (4) and is fixedly connected to the stator (2).

8. The motor according to claim 1, characterized in that, A fixing seat (8) is fixedly installed inside the inner cavity (101). The first end of the connecting pipe (5) is fixed on the fixing seat (8), and the lower end face of the fixing seat (8) is higher than the liquid level of the insulating oil inside the inner cavity (101).

9. The motor according to claim 1, characterized in that, The motor shaft (4) has a through hole (41), and the connecting pipe (5) passes through the through hole (41).

10. An electric-assisted bicycle, characterized in that, The device includes the motor as described in any one of claims 1-9, and also includes a frame, wherein the motor shaft (4) and the gas exchanger (6) are both fixedly mounted on the frame.

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