Oil-cooled permanent magnet brushless DC speed reduction motor

Abstract

This utility model discloses an oil-cooled permanent magnet brushless DC geared motor, including a housing, a motor stator and rotor, a planetary gear reduction mechanism, a motor shaft, cooling lubricating oil, and a pressure relief mechanism. The motor stator and rotor share a common cavity with the planetary gear reduction mechanism, and the cooling lubricating oil is directly injected into this cavity. The left planetary support is connected to the sun gear via a bearing, and the right planetary support adopts a one-way clutch structure. This utility model can effectively reduce the internal temperature rise of the motor, increase power density, extend service life, simplify the structure, and reduce production costs.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to an oil-cooled permanent magnet brushless DC geared motor. Background Technology

[0002] Currently, permanent magnet brushless DC geared motors are widely used in electric vehicles, industrial robots, and other fields. However, traditional permanent magnet brushless DC geared motors generally suffer from the following problems: Heat dissipation problem: The heat generated by the motor's stator and rotor during operation is combined with the heat generated by the gears during operation, resulting in excessive temperature rise inside the motor, which affects the motor's power density and service life, and in severe cases, may even cause the motor to burn out.

[0003] Gear lubrication issues: Most products use solid grease to lubricate gears, which leads to loud gear noise, severe wear, and shortened gear life.

[0004] Complex structure: In order to solve the gear lubrication problem, some manufacturers adopt the design of independent cavities for the motor stator and rotor and the gear reduction mechanism. Although the gear lubrication problem is solved, it increases the motor production cost and cannot effectively solve the heat generation problem of the motor stator and rotor.

[0005] Therefore, this application provides an oil-cooled permanent magnet brushless DC geared motor to solve the technical problems existing in the background art. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an oil-cooled permanent magnet brushless DC geared motor. This motor adopts a structure in which the motor stator and rotor and the gear reduction mechanism share a common cavity, and uses liquid lubricating oil for cooling and lubrication, which effectively reduces the internal temperature rise of the motor, increases power density, extends service life, simplifies the structure, and reduces production costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution: include: The housing consists of a left end cover, a right end cover, and a hub, forming a sealed cavity. Motor stator and rotor: including stator coils, magnets and rotor assembly, installed inside the housing; Planetary gear reduction mechanism: Includes sun gear, planet gear, internal gear ring, left planetary carrier and right planetary carrier, installed inside the housing; Motor shaft: Passes through the left and right end covers and connects to the rotor assembly and sun gear; Cooling and lubricating oil: Injected into the housing, submerging the motor stator, rotor, and planetary gear reduction mechanism; Pressure relief mechanism: Used to release internal pressure in the housing and prevent oil leakage.

[0008] The motor stator and rotor share a cavity with the planetary gear reduction mechanism, and the cooling and lubricating oil is directly injected into this cavity.

[0009] Furthermore, the left planetary carrier is connected to the sun gear via a bearing, and the right planetary carrier adopts a one-way clutch structure.

[0010] Furthermore, the pressure relief mechanism is a vent valve installed on the housing, or a sealing device with one-way pressure relief function installed on the housing.

[0011] Furthermore, the inner wall of the hub is provided with a flow guiding structure to guide the cooling lubricating oil to the motor stator and rotor.

[0012] Furthermore, the inner surface of the left end cover and / or the right end cover is provided with heat dissipation ribs to increase the heat dissipation area.

[0013] Furthermore, the cooling lubricating oil is gear oil or transformer oil with good thermal conductivity.

[0014] Compared with the prior art, the beneficial effects of this utility model are: The motor stator and rotor share a common cavity with the gear reduction mechanism. Cooling lubricating oil is directly immersed in the motor stator and rotor and the planetary gear reduction mechanism. The lubricating oil is agitated by the hub and gears and seeps into the interior of the stator and rotor and sprayed onto the inner surface of the left and right end covers. The efficient heat conduction characteristics of the liquid oil directly transfer the heat generated by the stator coil, magnets, and gear transmission to the end covers and hub. This can reduce the internal temperature rise of the same specification model of motor using oil cooling technology by 20~30℃ compared with conventional air-cooled motors, greatly improve the power density of the motor, and avoid the phenomenon of overheating and coil burnout.

[0015] The left planetary carrier is connected to the sun gear via a bearing, while the right planetary carrier adopts a one-way clutch structure, which effectively reduces the axial installation space of the planetary carrier and reduces the overall size of the motor.

[0016] The motor stator and rotor share the same cavity as the gear reduction mechanism, which simplifies the structure and reduces production costs.

[0017] The pressure relief mechanism can effectively release the internal pressure of the housing, prevent oil leakage, and improve the reliability of the motor. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the overall structure; Figure 2 This is a schematic diagram of the installation structure of the left and right planetary supports and planetary teeth; Figure 3 for Figure 2 A side view structural diagram.

[0019] In the diagram: 1. Left end cover; 2. Hub; 3. Magnet; 4. Stator coil; 5. Rotor assembly; 6. Oil baffle; 7. Breather valve; 8. Motor shaft; 9. Motor wire; 10. Key; 11. Right end cover; 12. Internal gear ring; 13. Right planetary support; 14. Left planetary support; 15. Sun gear; 16. Key; 17. Planetary gear. Detailed Implementation

[0020] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0021] Applicant's design Figure 1-3 The oil-cooled permanent magnet brushless DC geared motor shown includes: a left end cover 1, a hub 2, a magnet 3, a stator coil 4, a rotor assembly 5, an oil baffle 6, a breather valve 7, a motor shaft 8, a motor wire 9, a flat key 10, a right end cover 11, an internal gear ring 12, a right planetary support 13, a left planetary support 14, a sun gear 15, a flat key 16, and planetary gears 17. The housing consists of a left end cover 1, a right end cover 11, and a hub 2, forming a sealed cavity. The motor stator and rotor, including stator coils 4, magnets 3, and rotor assembly 5, are installed inside the housing. The planetary gear 17 reduction mechanism, including a sun gear 15, planetary gears 17, an internal gear ring 12, a left planetary support 14, and a right planetary support 13, is installed inside the housing. The motor shaft 8 passes through the left end cover 1 and the right end cover 11 and connects to the rotor assembly 5 and the sun gear 15. Cooling and lubricating oil is injected into the housing, submerging the motor stator and rotor and the planetary gear 17 reduction mechanism. A pressure relief mechanism is used to release the internal pressure of the housing. The motor stator and rotor and the planetary gear 17 reduction mechanism share a cavity, and the cooling and lubricating oil is directly injected into this cavity.

[0022] In this embodiment, the left planetary support 14 is connected to the sun gear 15 via a bearing, and the right planetary support 13 employs a one-way clutch structure. The pressure relief mechanism is a vent valve 7 installed on the housing, or a sealing device with one-way pressure relief function installed on the housing. The inner wall of the hub 2 is provided with a flow guiding structure to guide the cooling lubricating oil to the motor stator and rotor. The inner surface of the left end cover 1 and / or the right end cover 11 is provided with heat dissipation fins to increase the heat dissipation area. The cooling lubricating oil is gear oil or transformer oil with good thermal conductivity.

[0023] Working principle: When the motor is working, the rotor assembly 5 drives the sun gear 15 to rotate, and the sun gear 15 drives the planetary gear 17 to rotate around the internal gear ring 12, thereby achieving speed reduction. At the same time, the hub 2 and gears agitate the cooling lubricating oil, allowing the cooling lubricating oil to penetrate into the stator and rotor and spray onto the inner surface of the left and right end covers 11, transferring the heat generated by the motor stator, rotor, and gear reduction mechanism to the housing, achieving efficient heat dissipation. Due to the high temperature and the high-speed rotation of the stator, rotor, and gears, some of the cooling oil inside the motor housing will atomize, resulting in excessive pressure inside the motor housing. At this time, the vent valve 7 will open to release pressure inside the motor housing and prevent oil leakage from the motor.

[0024] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An oil-cooled permanent magnet brushless DC geared motor, characterized in that, include: The housing consists of a left end cover, a right end cover, and a hub, forming a sealed cavity; The motor stator and rotor, including stator coils, magnets and rotor assembly, are installed inside the housing; The planetary gear reduction mechanism includes a sun gear, planet gears, an internal gear ring, a left planetary carrier, and a right planetary carrier, which are installed inside the housing; The motor shaft passes through the left and right end covers and connects to the rotor assembly and the sun gear. Cooling and lubricating oil is injected into the housing to submerge the motor stator and rotor and the planetary gear reduction mechanism; The pressure relief mechanism is used to release the internal pressure of the housing; the motor stator and rotor and the planetary gear reduction mechanism share a cavity, and the cooling and lubricating oil is directly injected into the cavity.

2. The oil-cooled permanent magnet brushless DC geared motor according to claim 1, characterized in that, The left planetary carrier is connected to the sun gear via a bearing, while the right planetary carrier employs a one-way clutch structure.

3. The oil-cooled permanent magnet brushless DC geared motor according to claim 1, characterized in that, The pressure relief mechanism is either a vent valve installed on the housing or a sealing device with one-way pressure relief function installed on the housing.

4. The oil-cooled permanent magnet brushless DC geared motor according to claim 1, characterized in that, The inner wall of the hub is provided with a flow guiding structure to guide the cooling lubricating oil to the motor stator and rotor.

5. The oil-cooled permanent magnet brushless DC geared motor according to claim 1, characterized in that, The inner surface of the left end cover and / or the right end cover is provided with heat dissipation ribs to increase the heat dissipation area.

6. The oil-cooled permanent magnet brushless DC geared motor according to claim 1, characterized in that, The cooling lubricating oil is gear oil or transformer oil with thermal conductivity.

Images