Labyrinth core device, electric driver and vehicle

Abstract

The utility model discloses a labyrinth core device, an electric driver and a vehicle, the labyrinth core device comprises a columnar core main body, the outer wall of the core main body is provided with a ventilation groove, the core main body is provided with a blind hole, the opening of the blind hole is located on the end face of the first end of the core main body in the axial direction, a ventilation groove is formed in the core body, the first end, in the axial direction of the core body, of the ventilation groove is communicated with the blind hole, the second end, in the axial direction of the core body, of the ventilation groove is communicated with the end face of the second end of the core body, and the labyrinth core device can be arranged in a ventilation hole of an electric driver and used for forming a ventilation flow channel with the wall of the ventilation hole. On the premise that reliable ventilation is guaranteed, the labyrinth core device can improve the oil gas blocking capacity, and the problems that a ventilation labyrinth is simple in structure and difficult to arrange, and consequently a ventilation valve is blocked by oil gas and fails are solved.

Description

Technical Field

[0001] This utility model relates to the field of automotive technology, and in particular to a labyrinth core device, an electric drive, and a vehicle. Background Technology

[0002] In an oil-cooled electric drive system, the electric drive includes a motor and a reducer. The cavity of the electric drive is an oil-gas environment. During the operation of the electric drive, the temperature inside the cavity changes drastically, causing the pressure inside the cavity to change drastically. If the pressure difference between the cavity and the outside cannot be balanced, the sealing system of the electric drive will fail.

[0003] In drive systems, a common approach to address the pressure difference caused by the electric drive's operation is to install a venting structure above the drive housing. This can be achieved using mechanical venting valves or polymer filter membrane venting valves. However, during operation, the drive housing contains splashing oil droplets and a large amount of high-temperature oil vapor. To prevent oil from flowing out through the venting valve or clogging it, a labyrinth structure is typically added inside the drive housing in conjunction with the venting valve.

[0004] The labyrinth structure of an electric drive housing typically involves adding several baffles inside the electric drive housing at the vent valve mounting location to prevent splashing oil droplets from entering the vent valve. This labyrinth structure extends the venting path for oil and gas. When oil and gas pass through the labyrinth structure, they come into contact with the inner wall of the labyrinth structure, condense into oil droplets, and then flow back into the electric drive cavity, preventing oil and gas from flowing out or clogging the vent valve.

[0005] The existing labyrinth structure is an integral part of the electric actuator housing. Due to limitations in the internal space of the electric actuator and mold processing, the housing labyrinth structure is difficult to arrange and is usually laid out in a simple manner with a short ventilation path, which is not sufficient to effectively prevent oil and gas from entering the vent valve. During long-term operation of the electric actuator, problems such as oil and gas leakage or blockage of the vent valve may occur.

[0006] Therefore, a labyrinth core device, electric drive, and vehicle are needed to avoid or reduce the problem of oil and gas flowing into the vent valve. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a labyrinth core device, an electric drive, and a vehicle. The labyrinth core device can be installed in the vent of the electric drive to form an airflow channel with the wall of the vent, achieving a function similar to a labyrinth structure. Under the premise of ensuring reliable ventilation, the labyrinth core device can improve the ability to block oil and gas, and solve the problem that the simple ventilation labyrinth structure is difficult to arrange, which leads to oil and gas blockage and vent valve failure.

[0008] According to a first aspect of the present invention, a labyrinth core device is provided, comprising a columnar core body, a ventilation groove provided on the outer wall of the core body, and a blind hole provided on the core body with an opening located on the end face of a first end in the axial direction of the core body, wherein the ventilation groove communicates with the blind hole at the first end in the axial direction of the core body, and the ventilation groove communicates with the end face of the second end in the axial direction of the core body.

[0009] In one embodiment, at least a portion of the venting groove in the length direction is configured to extend in a wavy manner on the outer wall of the core body.

[0010] In one embodiment, the ventilation groove includes:

[0011] A lifting section extending axially along the core body,

[0012] A horizontal segment extending along a direction perpendicular to the axial direction of the core body, the horizontal segment being alternately connected to the lifting segment in sequence.

[0013] In one embodiment, at least a portion of the connection between the horizontal segment and the vertical segment is smoothly transitioned using an arc-shaped groove.

[0014] In one embodiment, a plurality of fins extending toward the ventilation groove are provided on the sidewall of the lifting section, each fin partially obscuring the flow area of ​​the ventilation groove.

[0015] In one embodiment, multiple fins are staggered on the same lifting section, with the free end of each fin inclined toward the second end of the core body relative to its fixed end.

[0016] In one embodiment, an oil drain hole communicating with the venting groove is provided at the second end of the core body, and the end of the oil drain hole away from the venting groove passes through the end face of the second end of the core body.

[0017] According to a second aspect of the present invention, an electric drive is provided, comprising:

[0018] The electric drive housing has ventilation holes on its walls.

[0019] The aforementioned labyrinth core device is disposed within the vent.

[0020] A vent valve is provided at the vent hole, and the vent valve is located on the outside of the labyrinth core device.

[0021] The ventilation groove and the wall of the ventilation hole form a ventilation channel, and the blind hole is connected to the ventilation valve.

[0022] According to a third aspect of the present invention, a vehicle is provided, including the electric drive described above.

[0023] The above technical solution has the following beneficial effects: the labyrinth core device is set inside the vent hole of the electric drive housing, forming a ventilation channel with the inner wall of the vent hole, which is used to extend the ventilation path of oil and gas, prevent oil and gas from flowing out to the vent valve, and protect the vent valve. Moreover, this labyrinth core device has a simple structure, can be easily installed on the electric drive housing, and the extension direction and length of the ventilation channel can be easily set to meet the usage requirements, improve the ability to block oil and gas, and solve the problem of oil and gas clogging the vent valve due to the short path and difficulty in arranging the ventilation labyrinth structure. Attached Figure Description

[0024] The disclosure of this utility model will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0025] Figure 1 A perspective view of a labyrinth core device according to an embodiment of the present invention is shown;

[0026] Figure 2 This shows a front view of a labyrinth core device according to an embodiment of the present invention;

[0027] Figure 3 The image shows a right view of a labyrinth core device according to an embodiment of the present invention;

[0028] Figure 4 This shows a rear view of a labyrinth core device according to an embodiment of the present invention;

[0029] Figure 5 The left view of a labyrinth core device according to an embodiment of the present invention is shown;

[0030] Figure 6 This invention demonstrates the application of a labyrinth core device according to an embodiment of the present invention in an electric drive.

[0031] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0032] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0033] One embodiment of this utility model provides a labyrinth core device. For example... Figures 1 to 5 As shown, the maze core device includes a core body 1. The core body 1 is cylindrical and is used to install into the vent 21 of the electric actuator housing 20 during use, such as... Figure 6As shown. A ventilation groove 2 is provided on the outer surface of the core body 1. That is, a groove is opened on the outer wall of the core body 1 to form the ventilation groove 2. At the same time, a blind hole 3 is provided on the core body 1. The opening of the blind hole 3 is located on the end face of the first end in the axial direction of the core body 1, and the blind hole 3 extends into the core body 1. The ventilation groove 2 is located at the first end in the axial direction of the core body 1 (at the... Figure 1 (The middle and upper ends are aligned) and communicate with blind hole 3. Ventilation groove 2 is located at the second end of the core body 1 in the axial direction (at...). Figure 1 (The middle and lower ends are aligned) and are connected to the end face of the second end of the core body 1.

[0034] like Figure 6 As shown, during the use of this labyrinth core device, the core body 1 is installed into the vent hole 21 of the electric drive housing 20. The vent groove 2 on the core body 1 and the wall of the vent hole 21 form a ventilation channel. Since the second end of the vent groove 2 is connected to the end face of the second end of the core body 1, an opening is formed at this location, allowing communication with the inner cavity of the electric drive housing 20. During operation, oil and gas enter the ventilation channel through the opening at the second end of the vent groove 2. The oil and gas flow in the ventilation channel, extending the channel length for the oil and gas to reach the vent valve 30 and increasing the contact area between the oil and gas and the electric drive housing 20 and the core body 1. When high-temperature oil and gas pass through the ventilation channel, they contact the electric drive housing 20 and the core body 1, condensing to form oil droplets that adhere to the wall of the ventilation channel, effectively preventing oil and gas from entering the vent valve 30 and causing blockage or failure of the vent valve 30. This labyrinth core device has a simple structure, is easy to process, and can be easily installed on the electric drive housing 20, resulting in low manufacturing costs. This labyrinth core device also allows for convenient setting of the extension direction and length of the airflow channel, thereby adjusting the airflow channel's ability to block oil and gas, effectively ensuring the safety of the vent valve 30.

[0035] In one embodiment, at least a portion of the vent groove 2 along its extended length is wavy. This arrangement can appropriately extend the length of the vent groove 2 to improve the oil-gas condensation effect, better adjust the length of the airflow channel, and meet usage requirements. In particular, this arrangement allows oil and gas to move repeatedly within the vent groove 2, appropriately increasing the resistance of the oil and gas and further improving the oil-gas condensation effect.

[0036] Specifically, the venting groove 2 includes a rising section 4 and a horizontal section 5. The rising section 4 extends along the axial direction of the core body 1. The horizontal section 5 extends in a direction perpendicular to the axial direction of the core body 1. The horizontal section 5 and the rising section 4 are alternately connected. The flow directions of oil and gas in the two rising sections 4 connected to the same horizontal section 5 are opposite. Figures 2 to 4 The direction of the middle arrow indicates the direction of oil and gas flow.

[0037] In one specific embodiment, the venting groove 2 includes a first section 6 that extends generally along the axial direction of the core body 1 and connects to the end face of the second end of the core body 1. After installation, the first section 6 connects to the inner cavity of the electric drive housing 20, serving as an inlet section for oil and gas from the inner cavity of the electric drive housing 20 to the outside. The venting groove 2 also includes a second section 7, a third section 8, a fourth section 9, a fifth section 10, a sixth section 11, and a seventh section 12 connected in sequence. The second section 7, the fourth section 9, and the sixth section 11 are horizontal sections 5, while the third section 8, the fifth section 10, and the seventh section 12 are vertical sections 4, and the oil and gas flow directions in two adjacent vertical sections 4 are opposite. In the above embodiment, the second section 7, the third section 8, the fourth section 9, the fifth section 10, the sixth section 11, and the seventh section 12 are generally constructed as a wavy structure with one wavelength. It is readily understood that, depending on actual needs, such as the diameter of the core body 1 and the processing level, the venting groove 2 may also include more wavelengths. During the outward ventilation of the electric drive housing 20, oil and gas enter the ventilation groove 2 through the first section 6, and then flow sequentially through the second section 7, the third section 8, the fourth section 9, the fifth section 10, the sixth section 11, and the seventh section 12. During the inward ventilation of the electric drive housing 20, the oil and gas flow is in the opposite direction to the inward ventilation described above.

[0038] Furthermore, at least some of the connections between the horizontal section 5 and the vertical section 4 are smoothly transitioned using arc-shaped grooves 13. For example, the second section 7 and the third section 8, the third section 8 and the fourth section 9, the fourth section 9 and the fifth section 10, and the fifth section 10 and the sixth section 11 are all connected using arc-shaped grooves 13. These arc-shaped grooves 13 allow for a smooth transition between the connected sections, facilitating processing and allowing for appropriate adjustment of the airflow channel length. Additionally, the arc-shaped grooves 13 facilitate the return of condensed oil on the inner wall of the airflow channel to the electric drive housing 20, preventing oil accumulation and blockage of the airflow channel.

[0039] In addition, to achieve communication between the venting groove 2 and the blind hole 3, a connecting hole 14 is provided on the wall of the blind hole 3 in the core body 1 to connect the venting groove 2 and the blind hole 3. This connecting hole 14 can extend radially along the core body 1. This structure is simple and easy to implement.

[0040] According to this application, fins 15 extending toward the ventilation groove 2 are provided on the sidewall of the lifting section 4. The fins 15 partially obstruct the flow area of ​​the ventilation groove 2. For example, the fins 15 block one-quarter to three-quarters, or for example, one-half, of the flow area of ​​the ventilation groove 2. Preferably, there are multiple fins 15. Multiple fins 15 are staggered on the same lifting section 4, for example, in… Figure 1In the seventh segment 12, three fins 15 are provided in the direction from the first end to the second end. The fixed ends of these three fins 15 are right, left, and right, respectively. The free end of each fin 15 is inclined towards the second end of the core body 1 in the axial direction relative to the fixed end. By setting the fins 15, the air passage can be extended, and the contact area between the oil and gas and the inner wall of the ventilation groove 2 can be increased. This increases the flow resistance, prolongs the contact time between the oil and gas and the inner wall of the ventilation groove 2, and improves the condensation efficiency of the oil and gas. In addition, the inclined structure of the fins 15 facilitates the flow and collection of condensed oil towards the second end.

[0041] An oil drain hole 16 communicating with the venting groove 2 is provided at the second end of the core body 1. For example, in the embodiment of this application, the oil drain hole 16 is provided at the sixth segment 11. It can be understood that when the venting groove 2 has multiple wavelengths, the oil drain hole 16 can be selectively provided at different troughs. The oil drain hole 16 is a damping hole. When there is no oil accumulation in the venting groove 2, the flow resistance of the oil drain hole is large, and oil and gas will not enter the venting groove 2 from the inner cavity of the electric drive housing 20 through the oil drain hole 16; when there is oil accumulation at the oil drain hole 16, the oil will enter the inner cavity of the electric drive housing 20 through the oil drain hole 16 under the action of gravity, avoiding oil blockage of the venting groove 2.

[0042] This application also relates to electric drives. For example... Figure 6 As shown, the electric actuator includes an electric actuator housing 20, a labyrinth core device, and a vent valve 30. A vent hole 21 is provided on the wall of the electric actuator housing 20. This vent hole 21 is open to the inside and outside. The labyrinth core device 10 is disposed within the vent hole 21. For example, the core body 1 is press-fitted into the vent hole 21. To ensure a seal, the core body 1 and the vent hole 21 are interference-fitted. Preferably, a limiting step 22 is provided on the wall of the vent hole 21 to limit the installation of the core body 1. After installation, the end face of the second end of the core body 1 abuts against the limiting step 22, and the vent groove 2 and the wall of the vent hole 21 form a ventilation channel. The vent valve 30 is disposed at the vent hole 21 and located outside the core body 1. A blind hole 3 on the core body 1 communicates with the vent valve 30. Oil and gas in the ventilation channel enter the blind hole 3 through the connecting hole 14, reducing the flow rate and contacting the inner wall of the blind hole 3, increasing the condensation effect. The vent valve 30 is sealed to the electric drive housing 20 to prevent external water or other impurities from entering the interior of the electric drive housing 20. At the same time, the vent valve 30 only allows gas to enter and exit, thus achieving the function of ventilation.

[0043] During the operation of the electric drive, as the electric drive housing 20 vents outward, the high-temperature oil and gas in the inner cavity of the electric drive housing 20 enters the ventilation channel through the first section 6, and then is guided by the second section 7 into the third section 8. In the third section 8, the oil and gas slowly climb, extending the ventilation channel and increasing the contact area. Afterward, the oil and gas enter the fourth section 9, which guides them horizontally. Then, the oil and gas enter the fifth section 10, where they slowly descend, increasing flow resistance and prolonging the contact time between the oil and gas and the inner wall of the ventilation channel, thus improving the condensation effect. Next, the oil and gas are guided by the sixth section 11 into the rising seventh section 12. In the seventh section 12, the oil and gas continue to rise, extending the ventilation channel and increasing the contact area between the oil and gas and the inner wall of the ventilation flow. It is evident that the repeated flow of oil and gas within the ventilation channel effectively increases the contact area with the channel, extends the flow time, ensures sufficient contact between the oil and gas and the channel wall, and improves the condensation effect. Next, the oil and gas enter the blind hole 3 through the connecting hole 14. Inside the blind hole 3, the oil and gas flow rate decreases, and it comes into full contact with the inner wall of the blind hole 3, further condensing. Finally, the gas enters the vent valve 30. It can be seen that after the high-temperature oil and gas passes through the vent channel, all the fine oil droplets in the oil and gas are condensed in the vent channel, ensuring that the gas entering the vent valve 30 does not contain oil and gas.

[0044] Furthermore, during the outward ventilation of the electric drive housing 20, oil droplets on the walls of the airflow channels in the first section 6, the second section 7, and the third section 8 slowly flow back into the inner cavity of the electric drive housing 20 under the influence of gravity. Meanwhile, the oil vapor condensed in the fifth section 10, the sixth section 11, and the seventh section 12 accumulates under gravity at the connection between the sixth section 11 and the seventh section 12. Since an oil drain hole 16 is provided at this location, the oil ultimately flows back into the inner cavity of the electric drive housing 20 through the oil drain hole 16. This structure effectively prevents condensed oil droplets from clogging the airflow channels. The inward ventilation path of the electric drive housing 20 is the opposite of the outward ventilation path described above.

[0045] In this application, the labyrinth core device is an independent component, forming a ventilation channel with the electric drive housing 20 after installation. It is simple to manufacture and has low production costs. The wavy ventilation grooves 2 on the labyrinth core device ensure the length of the ventilation channel, guiding the oil and gas to move repeatedly. They provide some resistance to the oil and gas, increasing the flow time within the ventilation grooves 2, which helps improve the condensation effect of the oil and gas and avoids or reduces the discharge of oil and gas to the ventilation valve 30.

[0046] The above are merely the principles and preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of this utility model, and these modifications should also be considered within the scope of protection of this utility model.

Claims

1. A labyrinth core device, characterized in that, The device includes a columnar core body, a ventilation groove on the outer wall of the core body, and a blind hole on the core body with an opening located on the end face of the first end of the core body in the axial direction. The ventilation groove communicates with the blind hole at the first end of the core body in the axial direction, and the ventilation groove communicates with the end face of the second end of the core body in the axial direction.

2. The labyrinth core device according to claim 1, characterized in that, At least a portion of the venting groove is configured to extend in a wavy manner on the outer wall of the core body along its length.

3. The labyrinth core device according to claim 2, characterized in that, The ventilation groove includes: A lifting section extending axially along the core body, A horizontal segment extending along a direction perpendicular to the axial direction of the core body, the horizontal segment being alternately connected to the lifting segment in sequence.

4. The labyrinth core device according to claim 3, characterized in that, At least a portion of the connection between the horizontal section and the vertical section is smoothly transitioned using an arc-shaped groove.

5. The labyrinth core device according to claim 3, characterized in that, Multiple fins extending toward the ventilation groove are provided on the side wall of the lifting section, and each fin partially blocks the flow area of ​​the ventilation groove.

6. The labyrinth core device according to claim 5, characterized in that, Multiple fins are staggered on the same lifting section, and the free end of each fin is inclined toward the second end of the core body relative to its fixed end.

7. The labyrinth core device according to any one of claims 1 to 6, characterized in that, An oil drain hole communicating with the vent groove is provided at the second end of the core body, and the end of the oil drain hole away from the vent groove passes through the end face of the second end of the core body.

8. An electric drive, characterized in that, include: The electric drive housing has ventilation holes on its walls. The labyrinth core device according to any one of claims 1 to 7 is disposed within the vent. A vent valve is provided at the vent hole, and the vent valve is located on the outside of the labyrinth core device. The ventilation groove and the wall of the ventilation hole form a ventilation channel, and the blind hole is connected to the ventilation valve.

9. The electric drive according to claim 8, characterized in that, A limiting step is provided on the wall of the vent, and the second end face of the core body sits on the limiting step.

10. A vehicle, characterized in that, Includes the electric drive as described in claim 8 or 9.

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