Liquid-cooled outer rotor hub motor
By setting oil seals on both sides of the bearing and setting the stator phase wire interface below the motor shaft, the existing outer rotor hub motor oil leakage and bearing damage is solved, extending the service life of the motor and ensuring sealing.
Patent Information
- Application Number
- CN202421619721.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The existing outer rotor hub motors have oil leakage and bearing damage, resulting in a shorter motor service life.
Set an oil seal on both sides of the bearing and set the stator phase wire interface below the motor shaft to prevent cooling oil leakage and the dissolution of bearing lubricating oil.
It effectively prevents oil leakage from the motor, extends the service life of the bearing, and ensures the sealing of the motor, avoids leakage.
Smart Images
Figure CN222996387U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of in-wheel motors, in particular to a liquid-cooled outer-rotor in-wheel motor. Background Art
[0002] The in-wheel motor is a driving component used for an electric vehicle to drive the electric vehicle to travel. The existing electric vehicle in-wheel motors include an outer-rotor motor and an inner-rotor motor. For the existing outer-rotor in-wheel motor, as Figure 1 shown, there is only one outer oil seal 3 for the bearing 2 of the motor shaft 1. Such a design is harmful to the service life of the motor because the commonly used cooling oil in the existing technology will dissolve the lubricating oil in the bearing 2, resulting in a rapid reduction in the service life of the bearing 2 and ultimately damaging the service life of the entire motor.
[0003] In addition, as Figure 2 shown, its stator phase wire interface 511 is arranged on the stator 5 above the motor shaft 1. During the rotation of the motor, the rotor 6 stirs the cooling oil and throws it above the stator 5. The cooling oil will flow down along the stator 5 coil and the stator phase wire 51. Since the expansion coefficients of the outer skin material of the stator phase wire 51 and the copper wire at high temperatures are different, a large gap appears between the copper wire and the outer skin material, and the high-temperature oil liquid will also leak out of the motor along this gap; in addition, during the operation of the motor, the high temperature causes the cooling oil to generate oil mist, and the oil mist will also enter the gap between the outer skin material and the copper wire and finally leak out of the motor, which is the so-called motor oil leakage.
[0004] Therefore, how to prevent oil leakage and extend the service life of the motor is an urgent problem to be solved at present. Content of the Utility Model
[0005] The purpose of the utility model is to provide a liquid-cooled outer-rotor in-wheel motor, which solves the problems of oil leakage of the existing motor and damage to the bearing reducing the service life of the motor by adding oil seals and changing the position of the stator phase wire interface.
[0006] To achieve the above purpose, the technical solution of the utility model is as follows:
[0007] A liquid-cooled outer-rotor in-wheel motor, which includes a motor housing, a rotor, a stator, and two end covers respectively covering the left and right ports of the motor housing. Bearings are arranged in the centers of the two end covers, the motor shaft is arranged between the two bearings, and the stator is fixedly sleeved on the motor shaft; the rotor is arranged in the motor housing and sleeved outside the stator; a cooling insulating liquid is also arranged in the motor housing;
[0008] Oil seals are arranged on both sides of the bearing; the motor shaft is provided with a stator phase wire outlet hole, the stator phase wire interface is arranged on the stator below the motor shaft, and the stator phase wire is led out through the stator phase wire outlet hole of the motor shaft.
[0009] The stator phase line outlet hole of the motor shaft includes a motor internal inlet hole and a motor external outlet hole that are arranged in a through manner.
[0010] The stator phase line is introduced from the motor internal inlet hole and led out from the motor external outlet hole.
[0011] The stator phase line interface is arranged on the stator at the lower right diagonal of the motor internal inlet hole.
[0012] The stator phase line interface is arranged on the stator at a 45° angle at the lower right diagonal of the motor internal inlet hole.
[0013] The advantages of the present utility model are as follows: 1. Oil seals are arranged on both sides of the bearing. The outer oil seal blocks the infiltration of muddy water outside the motor, and the inner oil seal blocks the cooling oil from entering the inside of the bearing, preventing the cooling oil from dissolving the bearing lubricating oil and prolonging the service life of the bearing; 2. Oil seals are arranged on both sides of the bearing, which can ensure the sealing performance of the motor and prevent leakage; 3. The stator phase line is arranged below the motor shaft, so that the cooling oil will not leak out along the stator phase line. Description of the Drawings
[0014] Figure 1 is a schematic structural diagram of an existing outer rotor liquid-cooled hub motor.
[0015] Figure 2 is a cross-sectional view of an existing outer rotor liquid-cooled hub motor.
[0016] Figure 3 is a schematic structural diagram of the present utility model.
[0017] Figure 4 is a schematic structural diagram of the assembly of the stator and the motor shaft of the present utility model.
[0018] Figure 5 is a schematic structural diagram of the motor shaft of the present utility model.
[0019] In the figure: 1 - motor shaft; 2 - bearing; 3 - oil seal; 41 - motor internal inlet; 42 - motor external outlet; 5 - stator; 51 - stator phase line; 511 - stator phase line interface; 6 - rotor; 7 - housing; 8 - end cover. Detailed Embodiments
[0020] The following further describes the present utility model with reference to the drawings. The drawings are only for illustrative purposes and should not be construed as a limitation of this patent.
[0021] In order to more concisely describe this embodiment, some components that are well known to those skilled in the art but are not relevant to the main content of this creation will be omitted in the drawings or descriptions. Additionally, for the sake of clarity, some components in the drawings will be omitted, enlarged, or reduced, but this does not represent the actual size or entire structure of the product.
[0022] A liquid-cooled outer-rotor hub motor of the present utility model, as Figure 3 shown, comprises a housing 7, a rotor 6, a stator 5, and two end caps 8 respectively covering the left and right ports of the housing 7. Bearings 2 are provided at the centers of the two end caps 8. A motor shaft 1 is arranged between the two bearings 2, and the stator 5 is fixedly sleeved on the motor shaft 1; the rotor 6 is arranged inside the housing 7 and sleeved outside the stator 5; a cooling insulating liquid is also arranged inside the housing 7.
[0023] As Figure 3 shown, oil seals 3 are arranged on both the inner and outer sides of the bearing 2; the outer oil seal 3 can prevent mud and water from entering the bearing 2; the inner oil seal 3 can prevent the coolant from entering the bearing 2 and will not damage the lubricating oil inside the bearing 2, thereby prolonging the service life of the bearing 2.
[0024] In addition, installing oil seals 3 on both sides of the bearing 2 can ensure the sealing performance of the motor and ensure no leakage occurs.
[0025] As Figure 4 shown, the motor shaft 1 is provided with a stator phase line outlet hole, and a stator phase line interface 511 is arranged on the stator 5 below the motor shaft 1. The stator phase line 51 is led out through the stator phase line outlet hole of the motor shaft 1.
[0026] As Figure 5 shown, the stator phase line outlet hole of the motor shaft 1 includes a motor inner inlet hole 41 and a motor outer outlet hole 42 which are arranged in a through manner.
[0027] The stator phase line 51 is introduced from the motor inner inlet hole 41 and led out from the motor outer outlet hole 42.
[0028] Preferably, as Figure 4 shown, the stator phase line interface 511 is arranged on the stator 5 at the right lower oblique side of the motor inner inlet hole 41.
[0029] Furthermore, the stator phase line interface 511 is arranged on the stator 5 at a 45° angle at the right lower oblique side of the motor inner inlet hole 41.
[0030] For an existing outer-rotor liquid-cooled hub motor as Figure 2 shown, its stator phase line interface 511 is arranged on the stator 5 above the motor shaft 1. During the rotation of the motor, the rotor 6 stirs the cooling oil and flings it above the stator 5. The cooling oil will flow down along the stator 5 coil and the stator phase line 51. Since the expansion coefficients of the outer skin material of the stator phase line 51 and the copper wire at high temperatures are different, a large gap appears between the copper wire and the outer skin material, and the high-temperature oil will seep out along this gap to the outside of the motor; in addition, the high temperature during the operation of the motor causes the cooling oil to generate an oil mist, and the oil mist will also enter the gap between the outer skin material and the copper wire and finally seep out of the motor, forming oil leakage.
[0031] In the present utility model, the stator phase line interface 511 is arranged below the motor shaft 1. Even if the coolant enters the gap between the outer skin material and the copper wire, the coolant will not climb upward and leak outside the motor, thus solving the oil leakage problem. In order to ensure that the stator phase line interface 511 is always below the motor shaft 1 during the assembly process of the motor, the stator phase line interface 511 is preferably located on the stator 5 at a 45° angle to the lower right of the motor shaft.
[0032] In summary, the above are only the preferred embodiments of the present utility model and are not intended to limit the scope of implementation of the present utility model. That is, all equivalent changes and modifications made to the content within the scope of the patent application of the present utility model should fall within the technical scope of the present utility model.
Claims
1. A liquid-cooled outer rotor hub motor, comprising a housing (7), a rotor (6), a stator (5), and two end covers (8) respectively covering left and right ports of the housing (7), wherein a bearing (2) is arranged at the center of each of the two end covers (8), a motor shaft (1) is inserted between the two bearings (2), and the stator (5) is fixedly sleeved on the motor shaft (1); the rotor (6) is arranged in the housing (7) and sleeved outside the stator (5); and a cooling insulating liquid is also arranged in the housing (7); Features: Oil seals (3) are arranged on both sides of the bearing (2); a stator phase line outlet hole is arranged on the motor shaft (1); a stator phase line interface (511) is arranged on the stator (5) below the motor shaft (1); and the stator phase line (51) is led out through the stator phase line outlet hole of the motor shaft (1).
2. The liquid-cooled outer rotor hub motor according to claim 1, characterized in that: The stator phase line outlet hole of the motor shaft (1) comprises a motor inner line inlet hole (41) and a motor outer line hole (42) which are arranged through-through.
3. The liquid-cooled outer rotor hub motor according to claim 2, characterized in that: The stator phase line (51) is introduced from the motor inner line hole (41) and led out from the motor outer line hole (42).
4. The liquid-cooled outer rotor hub motor according to claim 2, characterized in that: The stator phase line interface (511) is arranged on the stator (5) at a position obliquely below the right side of the line inlet hole (41) in the motor.
5. The liquid-cooled outer rotor hub motor according to claim 4, characterized in that: The stator phase line interface (511) is arranged on the stator (5) at a 45° angle obliquely below the right side of the motor inner line inlet hole (41).