Motor exhaust device

Abstract

The utility model provides a motor exhaust device, which relates to the technical field of motors and comprises a motor rotor, a motor stator and a bearing, and the motor rotor and the motor stator are connected through the bearing to form a motor. The motor stator comprises stator iron cores, a motor shaft and an air storage bag, the air storage bag is fixedly connected to the stator iron cores, the stator iron cores are connected to the two sides of the motor shaft respectively, and the air storage bag is communicated with the motor shaft. The air storage bag in the motor is connected with the outside of the motor through the exhaust hose, and the air pressure in the cavity in the motor is increased and the compressed air storage bag becomes small due to heating in the working process of the motor, so that the internal pressure of the cavity of the motor is reduced, the air pressure balance inside and outside the motor is ensured, the application range is wide, and the waterproof performance of the motor is kept; and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a motor exhaust device. Background Art

[0002] At present, the hub motor basically has no exhaust device. When the motor is in normal operation, the stator and rotor will heat up. The inner cavity of the motor is a closed space. When the motor heats up, the gas in the inner cavity will expand and cause the pressure in the motor cavity to increase. When the pressure in the motor cavity increases, and the internal gas cannot be discharged, it will continuously impact the motor sealing device, such as the oil seal, the contact surface between the end cover and the wheel hub, and the position of the outlet hole. Under long-term high pressure, the seal may fail, which will eventually lead to the failure of the motor waterproofing and the failure of the motor due to water ingress.

[0003] Some motors also use breathable valves to balance the pressure difference between the motor and the outside. However, the current breathable valve technology is only suitable for dust-free, oil-free and water-free environments. It is easy to fail and become blocked in dust, oil and water environments. In addition, the current breathable valves are made of a waterproof breathable membrane material. The pores on the surface of this waterproof breathable membrane are very small, resulting in a very slow ventilation speed.

[0004] There is also a one-way exhaust valve. When the motor heats up, the internal high-pressure gas is discharged. When the motor cools down, the outside air cannot enter the motor, which will form a negative pressure inside the motor, also causing the air pressure inside and outside the motor to be unbalanced.

[0005] With the development of the electric vehicle industry, the motor power is getting bigger and bigger, the corresponding motor stator heat is also getting bigger and bigger, and the internal air pressure of the hub motor is also getting bigger, which requires a more effective, more reliable and more adaptable exhaust device. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide a motor exhaust device.

[0007] According to the utility model, a motor exhaust device is provided, comprising: a motor rotor, a motor stator and a bearing, wherein the motor rotor and the motor stator are connected via the bearing to form a motor;

[0008] The motor stator comprises a stator core, a motor shaft and an air storage bag, the air storage bag is fixedly connected to the stator core, the stator core is respectively connected to both sides of the motor shaft, and the air storage bag is communicated with the motor shaft.

[0009] Preferably, an exhaust hole is provided at one end of the motor shaft, and the exhaust hole is connected to the outside of the motor.

[0010] Preferably, the air storage bag is connected to the exhaust hole through an exhaust hose and an air pipe joint in sequence.

[0011] Preferably, the exhaust hose is formed integrally with the air storage bag.

[0012] Preferably, the exhaust hose is fixedly connected to the air storage bag inner cavity of the air storage bag.

[0013] Preferably, the interior of the motor forms a closed motor cavity through the cooperation of the motor rotor and the motor stator, and the air storage bag is located inside the motor cavity of the motor.

[0014] Preferably, the inflation pressure of the air storage bag is 1-1.5 atmospheres.

[0015] Preferably, the volume of the air storage bag is inversely proportional to the volume of the motor inner cavity.

[0016] Preferably, a wire outlet hole is provided at the other end of the motor shaft, a power line is installed in the wire outlet hole, and the wire outlet hole is filled with sealant.

[0017] Preferably, the motor rotor includes a wheel hub, a left end cover and a right end cover of the motor. The left end cover and the right end cover of the motor are respectively fixed on both sides of the wheel hub, and the fixing surfaces between the wheel hub and the left end cover and the right end cover of the motor are coated with sealant. An oil seal is provided between the left end cover and the right end cover of the motor and the motor shaft.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The present application uses an internal air storage bag of the motor to connect to the outside of the motor through an exhaust hose. During the operation of the motor, the heat causes the air pressure in the internal cavity of the motor to increase, and the compressed air storage bag becomes smaller, thereby reducing the internal pressure of the motor cavity, thereby ensuring the balance of air pressure inside and outside the motor. It has a wide range of applications, maintains the waterproof performance of the motor, and increases the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0021] Figure 1 It is a cross-sectional view of the overall structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the structure of the air storage bag.

[0023] The figure shows: motor inner cavity 001, wheel hub 1, motor left end cover 2, stator core 3, bearing 4, oil seal 5, motor shaft 6, exhaust hole 601, outlet hole 602, air pipe joint 7, exhaust hose 8, air storage bag 9, air storage bag inner cavity 901, motor right end cover 10, motor rotor 11, motor stator 12. DETAILED DESCRIPTION

[0024] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0025] Example

[0026] According to a motor exhaust device provided by the utility model, Figure 1-2 As shown, it includes: a motor rotor 11, a motor stator 12 and a bearing 4. The motor rotor 11 is composed of a wheel hub 1, a motor left end cover 2 and a motor right end cover 10. The motor stator 12 is composed of a stator core 3, a motor shaft 6 and an air storage bag 9. The motor rotor 11 and the motor stator 12 are connected by the bearing 4 to form a complete wheel hub motor.

[0027] The motor left end cover 2 and the motor right end cover 10 are fixed to both sides of the wheel hub 1, and the fixed surfaces between the wheel hub 1 and the motor left end cover 2 and the motor right end cover 10 are coated with sealant, and an oil seal 5 is provided between the motor left end cover 2 and the motor right end cover 10 and the motor shaft 6. The motor interior forms a closed motor cavity 001 through the cooperation of the motor rotor 11 and the motor stator 12, and the air storage bag 9 is located inside the motor cavity 001 of the motor, and the air storage bag 9 does not contact the motor rotor 11. The air storage bag 9 is fixedly connected to the stator core 3, and the stator core 3 is connected to both sides of the motor shaft 6.

[0028] An exhaust hole 601 is provided at one end of the motor shaft 6, and the exhaust hole 601 is connected to the outside of the motor. A wire outlet hole 602 is provided at the other end of the motor shaft 6, and a power line is installed in the wire outlet hole 602, and the wire outlet hole 602 is filled with sealant. The air storage bag 9 is connected to the exhaust hole 601 through the exhaust hose 8 and the air pipe joint 7 in sequence. The exhaust hose 8 is formed integrally with the air storage bag 9; or, the exhaust hose 8 is fixedly connected to the air storage bag inner cavity 901 of the air storage bag 9.

[0029] The material used for the air bag 9 is elastic, high temperature resistant and aging resistant rubber, or other materials with the same characteristics. Its size should occupy the motor cavity 001 to the maximum extent, but should not have any contact with the motor rotor 11. The air bag 9 needs to be pre-inflated during assembly, and the inflation pressure is equal to or slightly greater than the normal atmospheric pressure, between 1-1.5 atmospheric pressures.

[0030] During normal operation of the motor, the stator and rotor will generate heat. The inner cavity 001 of the motor is a completely enclosed space. When the motor generates heat, the gas in the inner cavity 001 will expand, causing the pressure in the inner cavity 001 of the motor to increase. The air storage bag 9 is directly connected to the outside of the motor through the motor shaft exhaust hole 601 inside the motor. When the pressure in the inner cavity 001 of the motor increases, the air storage bag 9 will become smaller due to the gas discharged under pressure. The air storage bag 9 can be reduced to the maximum extent until all the gas in the inner cavity 901 of the air storage bag is discharged, and the volume of the air storage bag 9 will be greatly reduced. This is equivalent to increasing the space in the inner cavity 001 of the motor, absorbing the pressure generated by the expansion of the gas in the inner cavity 001, thereby balancing the pressure inside and outside the motor.

[0031] When the motor stops working, the temperature inside the motor gradually decreases, and the temperature of the gas in the inner cavity 001 also decreases accordingly. The air temperature decreases and the volume of the motor inner cavity 001 also shrinks accordingly. At this time, the air pressure in the air storage bag inner cavity 901 also decreases to negative pressure, so that the external air pressure enters the air storage bag inner cavity 901, and the air storage bag 9 returns to its original state volume.

[0032] In this way, by reducing or increasing the size of the air storage bag inner cavity 901, the motor is improved due to the internal and external pressure difference, the situation where the motor seal is damaged due to the pressure difference is reduced, the waterproof performance of the motor is maintained, and the service life of the motor is increased.

[0033] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A motor exhaust device, characterized in that: include: A motor rotor (11), a motor stator (12) and a bearing (4), wherein the motor rotor (11) and the motor stator (12) are connected via the bearing (4) to form a motor; The motor stator (12) comprises a stator core (3), a motor shaft (6) and an air storage bag (9); the air storage bag (9) is fixedly connected to the stator core (3); the stator core (3) is respectively connected to two sides of the motor shaft (6); and the air storage bag (9) is in communication with the motor shaft (6).

2. The motor exhaust device according to claim 1, characterized in that: An exhaust hole (601) is provided at one end of the motor shaft (6), and the exhaust hole (601) is connected to the outside of the motor.

3. The motor exhaust device according to claim 2, characterized in that: The air storage bag (9) is connected to the exhaust hole (601) via an exhaust hose (8) and an air pipe joint (7) in sequence.

4. The motor exhaust device according to claim 3, characterized in that: The exhaust hose (8) and the air storage bag (9) are formed in one piece.

5. The motor exhaust device according to claim 3, characterized in that: The exhaust hose (8) is fixedly connected to the air storage bag inner cavity (901) of the air storage bag (9).

6. The motor exhaust device according to claim 1, characterized in that: The interior of the motor forms a closed motor inner cavity (001) through the cooperation of the motor rotor (11) and the motor stator (12), and the air storage bag (9) is located inside the motor inner cavity (001) of the motor.

7. The motor exhaust device according to claim 1, characterized in that: The inflation pressure of the air storage bag (9) is 1-1.5 atmospheres.

8. The motor exhaust device according to claim 6, characterized in that: The volumes of the air storage bag (9) and the motor inner cavity (001) are inversely proportional.

9. The motor exhaust device according to claim 1, characterized in that: The other end of the motor shaft (6) is provided with a wire outlet hole (602), a power line is installed in the wire outlet hole (602), and the wire outlet hole (602) is filled with sealant.

10. The motor exhaust device according to claim 1, characterized in that: The motor rotor (11) comprises a wheel hub (1), a motor left end cover (2) and a motor right end cover (10); the motor left end cover (2) and the motor right end cover (10) are respectively fixed to two sides of the wheel hub (1); and the fixing surfaces between the wheel hub (1) and the motor left end cover (2) and the motor right end cover (10) are coated with sealant; and an oil seal (5) is provided between the motor left end cover (2), the motor right end cover (10) and the motor shaft (6).

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