Oil-cooled motor sealing structure

Abstract

The utility model discloses an oil cooling motor sealing structure which comprises a rotating shaft, a front end cover, a front bearing, a casing, a stator core, a rotor core, a rear end cover and a rear bearing, the stator core is installed in the casing, the rotor core is installed on the rotating shaft, and the rotating shaft is installed on the front end cover and the rear end cover through the front bearing and the rear bearing; the front end cover and the rear end cover are installed at the two ends of the machine shell. Two oil seals are arranged at the position of a rotating shaft of the front end cover, a sealing cavity is formed between the two oil seals, and an oil drainage channel is arranged between the sealing cavity and an inner cavity of the motor. According to the utility model, the oil seal is arranged on the outer side of the oil seal, the orientations of the two oil seals are the same, and a certain distance is reserved between the two oil seals, so that a small oil seal chamber capable of storing oil is formed, and the oil seal chamber is communicated with the inner cavity of the motor through the oil drainage channel; and a small amount of leaked cooling oil can timely flow back to the inner cavity of the motor through the oil drainage channel.

Description

Technical Field

[0001] This utility model belongs to the field of new energy vehicle drive motor technology, and in particular relates to an oil-cooled motor sealing structure. Background Technology

[0002] The drive motor is a core component of new energy vehicles, and its operational reliability directly affects the overall vehicle stability. To achieve higher motor density, the industry is increasingly using oil-cooled and oil-water hybrid cooling systems. Because oil is an insulator, it can directly contact the windings for heat dissipation, improving heat dissipation efficiency. This allows for increased electromagnetic load during the design phase, resulting in a reduction in motor size and weight. To prevent coolant leakage, oil seals are typically used for dynamic sealing. However, as motor speeds increase and new energy vehicles frequently switch between forward and reverse rotation, coolant leakage can occur. Summary of the Invention

[0003] To address the aforementioned problems, this utility model provides a sealing structure for an oil-cooled motor.

[0004] The technical solution adopted by this utility model is as follows: an oil-cooled motor sealing structure, including a rotating shaft, a front end cover, a front bearing, a housing, a stator core, a rotor core, a rear end cover, and a rear bearing. The stator core is installed inside the housing, and the rotor core is installed on the rotating shaft. The rotating shaft is installed on the front end cover and the rear end cover through the front bearing and the rear bearing. The front end cover and the rear end cover are installed at both ends of the housing. Two oil seals are provided at the rotating shaft of the front end cover, and a sealing chamber is formed between the two oil seals. An oil drain channel is provided between the sealing chamber and the inner cavity of the motor.

[0005] Furthermore, the two oil seals include a front oil seal and a rear oil seal, with the front oil seal located away from the inner side of the motor and the rear oil seal located close to the inner side of the motor; the oil seal openings of both the front and rear oil seals face the inner side of the motor.

[0006] Furthermore, the rear oil seal and the rotating shaft are interference fit.

[0007] Furthermore, the front oil seal is provided with a front end cover plate and a shaft end seal on its outer side, and the shaft end seal is installed on the rotating shaft.

[0008] Furthermore, the shaft end seal and the front cover plate form a cross-maze structure, and a rubber component is provided on the inner side of the shaft end seal, which contacts the front cover plate.

[0009] The beneficial effects of this utility model are as follows: by installing another oil seal on the outside of the oil seal, with the two oil seals facing the same direction and leaving a distance between them, a small oil seal chamber that can store oil is formed. This oil seal chamber is connected to the inner cavity of the motor through an oil drain channel, ensuring that the small amount of cooling oil that seeps out flows back into the inner cavity of the motor in a timely manner through the oil drain channel. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is an enlarged view of a portion of the structure of this utility model;

[0012] In the diagram: 1-Flange, 2-Shaft, 3-Cable outlet box, 4-Shaft end seal, 5-Front end cover, 6-Front oil seal, 7-Oil seal chamber, 8-Rear oil seal, 9-Oil drain passage, 10-Front end cover, 11-Front bearing, 12-Housing, 13-Stator core, 14-Rotor core, 15-Rear end cover, 16-Rear bearing, 17-Motor inner cavity, 41-Cross labyrinth structure, 42-Rubber parts. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] like Figure 1 As shown, this utility model is a sealing structure for an oil-cooled motor, including a rotating shaft 2, a front end cover 10, a front bearing 11, a housing 12, a stator core 13, a rotor core 14, a rear end cover 15, and a rear bearing 16. The stator core 13 is installed inside the housing 12, and the rotor core 14 is installed on the rotating shaft 2. The rotating shaft 2 is mounted on the front end cover 10 and the rear end cover 15 via the front bearing 11 and the rear bearing 16. The front end cover 10 and the rear end cover 15 are installed at both ends of the housing 12. The motor has a terminal box 3, and a flange 1 is installed at the end of the rotating shaft, thus forming the basic frame of the motor. Two oil seals are provided at the rotating shaft 2 of the front end cover 10, including a front oil seal 6 and a rear oil seal 8. The front oil seal 6 is located away from the inner side of the motor, and the rear oil seal 8 is located close to the inner side of the motor.

[0015] During normal operation of the motor, the inner cavity 17 of the motor is an oil-containing environment. To prevent cooling oil leakage, the rear oil seal 8 and the rotating shaft 2 are subjected to interference friction to achieve dynamic sealing, with the oil seal opening facing the inner side of the motor to seal the medium. However, a small amount of oil may still seep out through the rear oil seal 8. To prevent cooling oil from flowing to the outside of the motor, a front oil seal 6 is set at the front end of the rear oil seal 8. The oil seal openings of the front oil seal 6 and the rear oil seal 8 face the same direction, forming a sealed chamber 7 between the front oil seal 6 and the rear oil seal 8, achieving double sealing. At the same time, an oil drain channel is provided between the oil seal chamber 7 and the inner cavity 17 of the motor to ensure that the small amount of cooling oil seeping from the rear oil seal 8 flows back into the inner cavity 17 of the motor in a timely manner.

[0016] The reason why the motor oil seal can achieve rotary sealing is not only because it is pressed tightly against the shaft by the rubber, but also because the pumping function is achieved by the angle of the inner and outer edges of the oil seal lip and the oil return line on the lip ensures that the sealing medium does not leak. When there is water accumulation or splashing on the outside, water will enter the motor through the front oil seal 6, which will not only affect the oil quality but also cause the motor insulation to fail.

[0017] To ensure that water does not enter the motor and contaminate the cooling oil when the motor is submerged in water, a front cover plate 5 and a shaft end seal 4 are provided on the front oil seal 6. The shaft end seal 4 is installed on the rotating shaft 2.

[0018] A rubber component 42 is fitted onto the shaft end seal 4. During motor operation, the rubber component 42 rubs against the front cover plate 5 to prevent external water from contacting the motor oil seal when water accumulates. The shaft end seal 4 and the front cover plate 5 form a cross-maze structure 41 to prevent splashing water from contacting the oil seal.

[0019] The above description is a further detailed explanation of the present utility model in conjunction with specific preferred embodiments. It should not be considered that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the protection scope of the present utility model.

Claims

1. A sealing structure for an oil-cooled motor, comprising a shaft (2), a front end cover (10), a front bearing (11), a housing (12), a stator core (13), a rotor core (14), a rear end cover (15), and a rear bearing (16), wherein the stator core (13) is installed inside the housing (12), the rotor core (14) is installed on the shaft (2), and the shaft (2) is installed on the front end cover (10) and the rear end cover (15) via the front bearing (11) and the rear bearing (16); the front end cover (10) and the rear end cover (15) are installed at both ends of the housing (12); characterized in that: Two oil seals are provided at the pivot (2) of the front cover (10), and a sealed chamber (7) is formed between the two oil seals. An oil drain channel (9) is provided between the sealed chamber (7) and the inner cavity (17) of the motor.

2. An oil-cooled electric machine seal according to claim 1, wherein: The two oil seals include a front oil seal (6) and a rear oil seal (8). The front oil seal (6) is located away from the inside of the motor, and the rear oil seal (8) is located close to the inside of the motor. The oil seal openings of both the front oil seal (6) and the rear oil seal (8) face the inside of the motor.

3. An oil-cooled electric machine seal according to claim 2, wherein: The rear oil seal (8) and the rotating shaft (2) are interference fit.

4. An oil-cooled electric machine seal according to claim 2, wherein: The front oil seal is provided with a front cover plate (5) and a shaft end seal (4) on the outside. The shaft end seal (4) is installed on the rotating shaft (2).

5. An oil-cooled electric machine seal according to claim 4, wherein: The shaft end seal (4) and the front cover plate (5) form a cross maze structure (41). A rubber part (42) is provided on the inner side of the shaft end seal (4). The rubber part (42) is in contact with the front cover plate (5).

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