Motor and electric two-wheeled vehicle

Abstract

The application belongs to the technical field of electric vehicles, and discloses a motor and an electric two-wheeled vehicle. The motor comprises an air bag, the air bag is located outside a sealed chamber, the air bag is provided with an inner cavity, and the inner cavity of the air bag is communicated with the sealed chamber, so that the structural design of the air bag is not limited by the size of the space inside the motor. The air bag can be contracted or expanded to keep the internal and external air pressure of the sealed chamber balanced and prevent water from entering the motor. The inner cavity of the air bag is not communicated with the atmosphere. After long-term use, the air bag serves as a breathing cabin of the motor. When the motor operates, the temperature inside the motor rises, the air pressure increases, and the gas enters the air bag. When the motor stops operating, the temperature inside the motor cools down and decreases, the air pressure decreases, and the gas in the air bag flows back to the sealed chamber of the motor. The air pressure inside and outside the motor can be effectively balanced, water vapor in the motor is prevented from condensing into accumulated water, the motor is prevented from being damaged, and the normal use of the motor is affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, and particularly relates to a motor and an electric two-wheeled vehicle. BACKGROUND

[0002] At present, after the implementation of the new national standard, electric vehicles are divided into three categories: electric bicycles, electric mopeds and electric motorcycles. The motor is the core component of the electric vehicle. When the existing motor is running, the temperature in the cavity of the motor rises, the pressure increases, and the gas in the cavity needs to be discharged. The gas is generally discharged through the gap of the oil seal or the gap of the lead-out wire, or discharged through the poorly glued part of the side cover. However, after the motor stops running, the temperature in the cavity of the motor decreases, and after the negative pressure is formed, air will be sucked from the air outlet, thereby causing a siphon phenomenon. Since the air contains water vapor, when the air is sucked into the motor cavity, the water vapor in the air will condense into water droplets. Over time, when accumulated to a certain extent, water will form in the cavity of the motor, thereby affecting the operation of the motor and easily causing damage to the Hall element or coil short circuit of the motor, and the motor cannot operate normally.

[0003] In view of the above problems, a motor with a waterproof assembly in the prior art includes a motor body, the motor body includes a motor rear cover, the motor rear cover is installed at the rear side of the motor body, a waterproof assembly is installed on the inner side of the motor rear cover, the waterproof assembly includes an air bag, the air bag is located on the inner side of the motor rear cover, a gas guide opening is formed on the air bag to communicate the inside and outside of the air bag, the gas guide opening is connected with one end of a gas guide pipe, and the other end of the gas guide pipe extends to the outside of the air bag. An expansion assembly is added in the motor and communicated with the outside. When the air temperature in the motor decreases to cause the air pressure in the motor to decrease, the air pressure in the motor and the air pressure outside the motor remain the same, thereby avoiding water or air containing water vapor outside the motor from penetrating into the motor through the rotating shaft or the clamping part under the action of the pressure difference between the inside and outside, and ensuring the safety of the motor.

[0004] Although the motor with the waterproof assembly can prevent water or air containing water vapor outside from being sucked into the motor cavity to some extent, thereby ensuring the safety of the motor, the air bag is arranged in the motor cavity, which not only increases the volume of the motor, but also causes the air bag to be in communication with the atmosphere. After long-term use, water will accumulate in the air bag. The air bag with accumulated water arranged in the motor cavity will affect the natural vibration frequency of the motor, thereby affecting the performance of the motor, and frequent extraction of water from the air bag will also increase the maintenance cost of the motor. In addition, when the motor with the waterproof assembly is working, the temperature rises, and the air pressure in the motor cavity increases. At this time, the motor still needs to discharge air outward through the gap of the oil seal and the like. Therefore, the motor with the waterproof assembly cannot be made into a fully sealed type, and after the motor stops working and cools down, a small amount of air containing water vapor will still enter the motor cavity. SUMMARY

[0005] The present application aims at the above-mentioned problems, and provides an electric motor and an electric two-wheeled vehicle to solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions.

[0007] An electric motor comprises a motor shaft, a rotor, a stator and a wire harness, the wire harness comprises an outer skin and a wire arranged in the outer skin, the electric motor has a sealed chamber for accommodating the rotor and the stator, and the electric motor further comprises:

[0008] An air bag is arranged outside the sealed chamber, the air bag is provided with an inner cavity, the inner cavity of the air bag is communicated with the sealed chamber, and the inner cavity of the air bag is not communicated with the atmosphere.

[0009] Preferably, in the initial state, the air bag is in a contracted state; in the working state, the air bag is in an expanded state; the sum of the gas volume in the sealed chamber and the gas volume in the inner cavity of the air bag in the initial state is defined as a first gas volume, the sum of the gas volume in the sealed chamber and the gas volume in the inner cavity of the air bag in the working state is defined as a second gas volume, and the volume change amount of the air bag is the difference between the second gas volume and the first gas volume.

[0010] Preferably, the electric motor is a hub motor.

[0011] Preferably, one end of the motor shaft extends to the outside of the sealed chamber, and an air passage is arranged on the motor shaft, the air passage has a first air port and a second air port, the first air port is arranged in the sealed chamber, the second air port is arranged outside the sealed chamber, and the inner cavity of the air bag is communicated with the second air port.

[0012] Preferably, the inner cavity of the air bag is communicated with the sealed chamber through an air hose.

[0013] Preferably, the air hose is arranged in the outer skin, one end of the air hose is communicated with the sealed chamber, and the other end of the air hose extends into the inner cavity of the air bag.

[0014] Preferably, the inner diameter of the outer skin is greater than the outer diameter of the wire to form an air gap, one end of the air gap is communicated with the inner cavity of the air bag, and the other end of the air gap is communicated with the sealed chamber.

[0015] Preferably, one end of the air bag has a first wire passing hole, and the other end of the air bag has a second wire passing hole, the outer skin is in sealed connection with the first wire passing hole, the wire passes through the first wire passing hole into the inner cavity of the air bag and passes out of the second wire passing hole, and a sealing member is arranged on the air bag outside the second wire passing hole to seal the gap between the air bag and the wire.

[0016] Preferably, the wire harness is in interference fit with the motor shaft.

[0017] To achieve the above object, the application further provides an electric two-wheeled vehicle comprising the above motor.

[0018] The application has the following beneficial effects:

[0019] The application provides a motor, which has a sealed cavity, and an air bag is arranged outside the sealed cavity, and the inner cavity of the air bag is communicated with the sealed cavity of the motor, so that the structural design of the air bag is not limited by the size of the space inside the motor, the air bag can be contracted or expanded to keep the air pressure inside and outside the sealed cavity balanced, and water can be prevented from entering the motor. The inner cavity of the air bag is not communicated with the atmosphere, and after long-term use, the air bag serves as a breathing cabin of the motor, the temperature inside the motor rises when the motor operates, the air pressure increases, and air enters the air bag; when the motor stops operating, the temperature inside the motor cools down, the air pressure decreases, and the air in the air bag flows back to the sealed cavity of the motor, so that the air pressure inside and outside the motor can be effectively balanced, water vapor can be prevented from condensing into accumulated water in the motor, and the motor can be prevented from being damaged and affected in normal use.

[0020] The application provides an electric two-wheeled vehicle, which is provided with a motor, and the motor is used to drive the wheels of the electric two-wheeled vehicle to travel, and an air bag is arranged outside the motor, the air bag is contracted or expanded to balance the air pressure inside and outside the motor, accumulated water in the motor is avoided, the performance of the motor is stabilized, and the electric two-wheeled vehicle can travel on the road normally. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Structure of the motor in the first embodiment of the application Figure 1

[0022] Figure 2 Structure of the motor in the first embodiment of the application Figure 2

[0023] Figure 3 Front view of the motor in the first embodiment of the application

[0024] Figure 4 Front view of the motor in the second embodiment of the application.

[0025] Reference signs: ​​

[0026] 1. air bag; 11. first wire hole; 12. second wire hole;

[0027] 2. motor shaft; 21. first air port; 22. second air port;

[0028] 3. wire harness;

[0029] 4. wire;

[0030] 5. seal;

[0031] 6. breather hose. DETAILED DESCRIPTION

[0032] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects reached more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] The technical solutions of the present application will be further described below with reference to the drawings and through specific embodiments.

[0036] Embodiment one

[0037] The present embodiment provides a motor, such as Figures 1-3As shown, the motor includes a motor shaft 2, a rotor, a stator and a wire harness 3, the fixed part in the motor is the stator, the rotating part is the rotor, the wire harness 3 includes an outer skin and a wire 4 arranged in the outer skin, the motor has a closed chamber for accommodating the rotor and the stator, and the motor further includes an air bag 1. The internal structure of the motor of the electric two-wheeled vehicle is compact, if the air bag 1 is arranged in the inner cavity of the motor, not only the volume of the motor is increased, but also because the air bag 1 is communicated with the atmosphere, after long-term use, there will be water accumulation in the air bag 1, the air bag 1 with water accumulation arranged in the inner cavity of the motor will affect the natural vibration frequency of the motor, and further affect the performance of the motor, therefore, the air bag 1 is located outside the closed chamber, so that the structural design of the air bag 1 is not limited by the size of the space inside the motor, the air bag 1 is provided with an inner cavity, the inner cavity of the air bag 1 is communicated with the closed chamber, the air bag 1 can be contracted or expanded, so as to keep the internal and external air pressure of the closed chamber balanced, and prevent water from entering the motor. The inner cavity of the air bag 1 is not communicated with the atmosphere, after long-term use, the air bag 1 as the breathing cabin of the motor can effectively balance the internal and external air pressure of the motor, avoid the siphon phenomenon, and further avoid water accumulation in the motor to damage the motor, and has no effect on the performance of the motor.

[0038] Optionally, the air bag 1 can be made of TPU or other materials with elasticity, and the air bag 1 in the application has the functions of waterproof, flame retardant and ultraviolet resistance. The air bag 1 has elasticity, and can freely expand or shrink with the inflow and outflow of gas, so as to balance the internal and external air pressure of the motor when the motor expands or shrinks with heat or cold. At the same time, the rubber material of the air bag 1 should have the characteristics of waterproof and flame retardant, so as to prevent the air bag 1 from bursting due to changes of external factors, thereby affecting the normal use of the motor.

[0039] Optionally, the outer skin and the wire 4 are made of flexible material, which can be adjusted in any direction to adapt to various changes of the external space of the motor, and can be freely arranged on the motor, which has strong adaptability.

[0040] Further, with reference to the accompanying drawings, Figures 1-3As shown, in the initial state, the motor is cold and always in a stop state, and the air bag 1 is in a contracted state, and the volume of the inner cavity of the air bag 1 is ideally set to 0 in the initial state. In the working state, the motor is continuously running, the temperature is rising, the air pressure is increasing, the gas in the sealed chamber of the motor is discharged into the air bag, and the air bag 1 is in an inflated state. The sum of the gas volume in the sealed chamber and the gas volume in the inner cavity of the air bag 1 in the initial state is defined as the first gas volume, and the sum of the gas volume in the sealed chamber and the gas volume in the inner cavity of the air bag 1 in the working state is defined as the second gas volume. The volume change of the air bag 1 is the difference between the second gas volume and the first gas volume. The size of the air bag 1 is designed to satisfy the air pressure balance formula, which is P1*V1 / T1=P2*V2 / T2, wherein P1 is the air pressure in the inner cavity of the motor when the motor is cold and stopped, V1 is the air volume in the inner cavity of the motor when the motor is cold and stopped, T1 is the temperature in the inner cavity of the motor when the motor is cold and stopped, P2 is the air pressure in the inner cavity of the motor at a certain time after the motor is running and the temperature is rising, V2 is the air volume in the inner cavity of the motor at a certain time after the motor is running and the temperature is rising, and T2 is the temperature in the inner cavity of the motor at a certain time after the motor is running and the temperature is rising. T1 is 25℃ room temperature, T2 cannot exceed 105℃, V1 is in the range of 0.1-8L, preferably V1 is in the range of 0.6-5L, and through calculation analysis and test, P2 is about 1.2-1.5 times of P1.

[0041] Further, with reference to the Figures 1-3 As shown, the motor is a hub motor, which is used as a power source to drive the rotation of the hub. The motor can be an inner rotor structure motor or an outer rotor structure motor. The inner rotor refers to a rotating body supported by an inner bearing and rotating inside, and the outer rotor refers to a rotating body supported by an outer bearing and rotating outside. Regardless of the inner rotor motor or the outer rotor motor, a sealed chamber is formed inside the motor, and the air pressure balance between the inside and outside of the motor can be achieved by the air bag 1 to avoid the occurrence of siphon phenomenon.

[0042] Further, with reference to the Figures 1-3 As shown, one end of the motor shaft 2 extends to the outside of the sealed chamber, the other end is connected to the inside of the sealed chamber, and the motor shaft 2 is provided with an air passage having a first air port 21 and a second air port 22. The first air port 21 is located in the inside of the sealed chamber, and the second air port 22 is located in the outside of the sealed chamber. The inner cavity of the air bag 1 is connected to the second air port 22. When the motor is running, the temperature inside the motor rises, the air pressure increases, the gas in the sealed chamber enters from the first air port 21, passes through the air passage of the motor shaft 2, and finally enters the inner cavity of the air bag 1 through the second air port 22, effectively balancing the air pressure inside and outside the motor.

[0043] Further, with reference to the Figures 1-3As shown, the inner cavity of the airbag 1 is connected to the sealed chamber via a ventilation hose. In this embodiment, the ventilation hose can be made of any material including EPDM, silicone, polyvinyl chloride, thermoplastic elastomer, or nylon, and has certain wear resistance, high temperature resistance, and flexibility. The ventilation hose is used to provide gas transportation within the sealed chamber and the inner cavity of the airbag 1. During the high-temperature gas transportation process, the ventilation hose is heat-resistant and has a long service life. In addition, the ventilation hose serves as a key transmission channel for balancing air pressure, thereby not affecting the performance of the motor.

[0044] Further, continue to refer to Figures 1-3 As shown, the ventilation hose is placed inside the outer sheath, embedded in the wiring harness 3, and bundled with the wire 4. The ventilation hose is made of insulating and non-conductive material, so it will not interfere with the wire 4. One end of the ventilation hose is connected to the sealed chamber, and the other end of the ventilation hose extends into the inner cavity of the airbag 1. When the motor starts running, the gas temperature and pressure in the sealed chamber increase. Under the action of the pressure difference, the gas enters the inner cavity of the airbag 1 through the ventilation hose. The airbag 1 acts as a breathing chamber to effectively balance the internal and external air pressures of the motor, avoiding the occurrence of siphoning, and thus preventing water accumulation in the motor and damage to the motor.

[0045] Further, continue to refer to Figures 1-3 As shown, the inner diameter of the outer sheath is larger than the outer diameter of the conductor 4, forming a ventilation gap. One end of the ventilation gap communicates with the inner cavity of the airbag 1, and the other end communicates with the sealed chamber. As the motor heats up during operation, the gas in the sealed chamber is discharged through the ventilation gap between the outer sheath and the conductor 4 and stored in the airbag 1. After the motor stops operating for a period of time, the temperature drops and negative pressure is generated, causing the gas in the airbag 1 to be drawn into the sealed chamber through the ventilation gap between the outer sheath and the conductor 4, thereby balancing the internal and external air pressures due to thermal expansion and contraction of the motor.

[0046] Further, continue to refer to Figures 1-3As shown, one end of the air bag 1 has a first wire passing hole 11, and the other end of the air bag 1 has a second wire passing hole 12, the outer skin is sealingly connected with the first wire passing hole 11, the wire passes through the first wire passing hole 11 and extends into the inner cavity of the air bag and is taken out from the second wire passing hole 12, which does not affect the control of the motor while ensuring the balance of the internal and external air pressure of the motor. In this embodiment, the wire harness passes through the second wire passing hole 12, the first wire passing hole 11, the outer skin and is connected with the motor in sequence, the gas in the sealed chamber enters the inner cavity of the air bag 1 along the setting line of the wire harness 3, effectively balances the internal and external air pressure of the motor, ensures that the performance of the motor is not affected, and further ensures that the motor can operate normally. The air bag 1 is provided with a sealing element 5 outside the second wire passing hole 12, and the sealing element 5 is used to seal the gap between the air bag and the wire. Specifically, the sealing element 5 seals the gap between the wire 4 and the second wire passing hole 12, prevents the air bag 1 from leaking, and at the same time prevents rainwater or splashed water during travel from entering the motor, thereby achieving a sealing effect and good waterproof effect.

[0047] Further, with reference to the above description of the first embodiment, Figures 1-3 As shown, the wire harness 3 is in interference fit with the motor shaft 2. Specifically, one end of the wire harness 3 is inserted into the motor shaft 2, and the outer diameter of the wire harness 3 is slightly larger than the shaft diameter of the motor shaft 2. By external force, one end of the wire harness 3 is inserted into the interior of the motor shaft 2, and at this time, the wire harness 3 is in interference fit with the motor shaft 2, so as to prevent the wire harness 3 from being loose and separated from the motor shaft 2, thereby affecting the normal use of the motor assembly.

[0048] The working process of the motor is as follows:

[0049] When the motor is running, the temperature inside the motor rises, the air pressure increases, and the gas in the sealed chamber enters the inner cavity of the air bag 1 through the air gap between the outer skin and the wire 4, at this time, the internal and external air pressure of the motor is in a balanced state; when the motor stops running, the temperature inside the motor cools down, the air pressure decreases, and the gas in the air bag 1 flows back to the sealed chamber of the motor through the air gap between the outer skin and the wire 4, thereby avoiding water entering the motor and causing damage, and affecting the normal use of the motor.

[0050] The embodiment also provides an electric two-wheeled vehicle, which can be an electric bicycle, an electric motorcycle or the like. The electric two-wheeled vehicle comprises the above motor, and the motor is arranged on the electric two-wheeled vehicle and used to drive the wheels of the electric two-wheeled vehicle to travel. The air bag 1 is arranged outside the motor, and through the contraction or expansion of the air bag 1, the air pressure balance in the sealed chamber of the motor is controlled when the temperature changes, water accumulation in the motor is avoided, the service life of the motor is prolonged, the performance of the motor is stable, and thus the electric two-wheeled vehicle can travel on the road normally.

[0051] Embodiment two

[0052] This embodiment provides a motor, which is basically the same as the motor in the first embodiment, except that a ventilation hose 6 is provided in the wiring harness 3 .

[0053] like Figure 4 As shown, in this embodiment, an airbag 1 is disposed outside the housing. The airbag 1 has an air inlet. A ventilation hose 6 is embedded within the wiring harness 3. One end of the ventilation hose 6 is connected to the airbag 1, and the other end is connected to the motor shaft 2. The ventilation hose 6 can be made of any material including EPDM, silicone, polyvinyl chloride, thermoplastic elastomer, or nylon, and has certain wear resistance, high temperature resistance, and flexibility. The ventilation hose 6 is tightly attached to the wiring harness 3, including the control and power cables, within the housing. One end of the ventilation hose 6 is connected to the sealed chamber, and the other end is connected to the inner cavity of the airbag 1. This allows gas in the motor sealed chamber and the airbag 1 to communicate through the ventilation hose 6, allowing gas to enter the airbag 1 from the motor sealed chamber through the ventilation hose 6, or to enter the motor sealed chamber from the airbag 1 through the ventilation hose 6. When the motor is running, the temperature inside the motor rises, the air pressure increases, and the gas is directly discharged into the airbag 1 through the ventilation hose 6; when the motor stops running, the temperature inside the motor cools down and the air pressure decreases, and the gas in the airbag 1 flows back to the inside of the motor through the ventilation hose 6, effectively balancing the air pressure inside and outside the motor, avoiding water accumulation inside the motor, extending the service life of the motor, and thus ensuring the performance of the motor.

[0054] In the description herein, it should be understood that the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0055] In this specification, reference to terms such as "one embodiment" or "example" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0056] In addition, the above merely is the preferred embodiment of the present application and the applied technical principle. The person skilled in the art can understand that the present application is not limited to the specific embodiments here, and the person skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the protection scope of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the appended claims.

Claims

1. An electric machine comprising a machine shaft (2), a rotor, a stator and a wire bundle (3), said wire bundle (3) comprising an outer skin and wires (4) placed inside the outer skin, said electric machine having a closed chamber for accommodating said rotor and said stator, characterized in that, The motor further comprises: An air bag (1) is located outside the sealed chamber, the air bag (1) is provided with an inner cavity, the inner cavity of the air bag (1) is communicated with the sealed chamber, and the inner cavity of the air bag (1) is not communicated with the atmosphere; One end of the motor shaft (2) extends to the outside of the sealed chamber, and an air passage is formed in the motor shaft (2), the air passage is provided with a first air port (21) and a second air port (22), the first air port (21) is located in the sealed chamber, and the second air port (22) is located outside the sealed chamber, the inner cavity of the air bag (1) is communicated with the second air port (22); The inner diameter of the outer skin is greater than the outer diameter of the wire (4) to form a ventilation gap, one end of the ventilation gap is communicated with the inner cavity of the air bag (1), and the other end of the ventilation gap is communicated with the sealed chamber.

2. The electric machine of claim 1, wherein, In the initial state, the air bag (1) is in a contracted state; in the working state, the air bag (1) is in an expanded state; the sum of the gas volume of the sealed chamber and the gas volume of the inner cavity of the air bag (1) in the initial state is defined as the first gas volume, the sum of the gas volume of the sealed chamber and the gas volume of the inner cavity of the air bag (1) in the working state is defined as the second gas volume, and the volume change amount of the air bag (1) is the difference between the second gas volume and the first gas volume.

3. The electric machine of claim 1, wherein, The motor is a hub motor.

4. The electric machine of claim 1, wherein, One end of the air bag (1) is provided with a first wire hole (11), and the other end of the air bag (1) is provided with a second wire hole (12), the outer skin is sealingly connected with the first wire hole (11), the wire (4) penetrates into the inner cavity of the air bag through the first wire hole (11) and penetrates out of the second wire hole (12), and a sealing element (5) is arranged outside the second wire hole (12) of the air bag (1), and the sealing element (5) is used for sealing the gap between the air bag (1) and the wire (4).

5. The electric machine of claim 1, wherein, The wire harness is in interference fit with the motor shaft (2).

6. An electric two-wheeled vehicle characterized by comprising: The motor comprises the motor of any one of claims 1-5. The motor comprises the motor of any one of claims 1-5.

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