Ventilation structure of electric drive assembly and automobile
By designing the ventilation structure of the electric drive assembly, the maze chamber and the misaligned gap structure are used to reduce the flow rate of the oil and gas mixture, causing the oil droplets to fall and polymerize into large oil droplets, solving the problem that the internal heat and pressure of the electric drive assembly cannot be discharged in time, and the effect of reducing oil leakage and oil loss is achieved.
Patent Information
- Application Number
- CN202420597600.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-03-26
Smart Images
Figure CN222572070U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of range-extending and hybrid power ventilation systems, and in particular to a ventilation system for an electric drive assembly. Background Art
[0002] With the rapid development of plug-in hybrid electric vehicles, the application of extended-range dual-motor electric drives is becoming more and more widespread. The reliability and stability of the electric drive assembly during driving are highly valued. The ventilation system of the electric drive assembly is also of concern. If the heat and pressure inside the electric drive cannot be discharged in time, it will cause adverse effects such as oil leakage. Utility Model Content
[0003] One of the purposes of the utility model is to provide a ventilation structure of an electric drive assembly to solve the problem that the heat and pressure inside the electric drive cannot be discharged in time, causing adverse effects such as oil leakage.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0005] A ventilation structure of an electric drive assembly includes a box cover and a shell. When the box cover and the shell are buckled together, the interior of the box cover and the shell is provided with a labyrinth chamber connected to the outside. A first baffle plate and a second baffle plate are arranged in sequence along the direction of flow of an oil-gas mixture. The first baffle plate is provided with a first notch, and the second baffle plate is provided with a second notch. The first notch and the second notch are staggered.
[0006] According to the above technical means, since the first notch and the second notch are staggered in the direction of the oil-gas mixture flow, after the oil-gas mixture passes through the first notch, it will collide back and forth on the first baffle and the second baffle, reducing the flow rate of the oil-gas mixture, so that the oil droplets of the oil-gas mixture fall under the action of gravity, and a large number of small oil droplets aggregate to form large oil droplets, and then flow back to the electric drive along the first baffle and the second baffle.
[0007] Furthermore, a first convex rib is provided inside the box cover or the shell, and the labyrinth chamber is formed between a portion of the first convex rib and an inner wall of the box cover or the shell, and the first baffle plate and the second baffle plate are both located on the inner side of the first convex rib.
[0008] According to the above technical means, the strength of the box cover or the shell is improved, and at the same time the amount of oil thrown into the maze chamber when the electric drive rotor rotates is reduced.
[0009] Furthermore, an air intake passage is formed between the portion of the first rib extending relative to the labyrinth chamber and the box cover or the inner side wall of the shell, so that the oil-gas mixture flows into the first notch through the air intake passage.
[0010] Furthermore, the second notch is located at an end of the second baffle, and the position of the first notch corresponds to a position between two ends of the second baffle.
[0011] According to the above technical means, the high-speed oil-liquid mixture can collide multiple times between the first baffle and the second baffle, which greatly reduces the flow rate of the oil-liquid mixture and increases the amount of oil falling.
[0012] Furthermore, after the box cover and the shell are buckled together, the interior has a cavity connected to the maze chamber, and the cavity is connected to the outside.
[0013] According to the above technical means, when the oil-liquid mixture enters the chamber, the flow rate can be further reduced due to the space in the chamber, and then flows from the chamber to the outside, thereby increasing the amount of oil falling.
[0014] Furthermore, the chamber is located in one of the box cover or the shell, and the maze chamber is located in the other of the box cover or the shell. When the box cover and the shell are buckled together, the openings of the chamber and the maze chamber are arranged facing each other, and the closing surface of the chamber completely overlaps with the closing surface of the maze chamber.
[0015] According to the above technical means, the volume of the arrangement chamber and the maze chamber is reduced.
[0016] Furthermore, the box cover or the shell has a second convex rib inside, and the cavity is formed between the second convex rib and the inner side wall of the box cover or the shell.
[0017] Furthermore, the second baffle is arranged to be inclined downward.
[0018] Furthermore, the first rib is arranged to be inclined downward.
[0019] Furthermore, a vent plug is provided on the top of the chamber, and the vent plug is located on the box cover or the shell.
[0020] A car comprises the ventilation structure of the electric drive assembly mentioned above.
[0021] Beneficial effects of the utility model:
[0022] The high-speed oil-liquid mixture of the utility model flows through the maze chamber and then flows to the outside, thereby preventing the heat and pressure inside the electric drive from being unable to be discharged in time, causing adverse effects such as oil leakage.
[0023] The utility model reduces the flow rate of the oil-gas mixture, so that the oil droplets of the oil-gas mixture fall under the action of gravity, and a large number of small oil droplets are aggregated to form large oil droplets, which then flow back to the electric drive along the first baffle and the second baffle, thereby saving oil while exhausting gas and avoiding the loss of oil caused by a large amount of oil flowing out to the outside. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a schematic diagram of the structure of the utility model;
[0025] Figure 2 It is a schematic diagram of the structure of the present invention;
[0026] Figure 3 This is a schematic diagram of the maze chamber structure;
[0027] Figure 4 is a schematic diagram of the chamber structure;
[0028] Figure 5 is a schematic diagram of the shell structure;
[0029] Figure 6 It is a schematic diagram of the box cover structure;
[0030] Figure 7 It is a schematic diagram of the flow direction of the oil-liquid mixture, where the direction of the arrow indicates the flow route of the oil-liquid mixture.
[0031] Among them, 1-box cover; 2-shell; 3-chamber; 31-second convex rib; 32-vent plug mounting hole; 4-maze chamber; 41-first baffle; 42-second baffle; 43-first notch; 44-second notch; 45-first convex rib; 5-ventilation channel. DETAILED DESCRIPTION
[0032] The following will refer to the accompanying drawings and preferred embodiments to illustrate the implementation of the technical solution of the utility model. Those skilled in the art can easily understand other advantages and effects of the utility model from the contents disclosed in this specification. The utility model can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the utility model. It should be understood that the preferred embodiments are only for illustrating the utility model, not for limiting the scope of protection of the utility model.
[0033] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.
[0034] In order to avoid the problem that the heat and pressure inside the electric drive cannot be discharged in time, causing adverse effects such as oil leakage, this embodiment has a related technology before the disclosure of this application, specifically: making two cavities on one component, which are then sealed by a bowl-shaped plug and connected to the atmosphere through a vent plug. However, according to the applicant's research, this structure makes the structure of the back cover complicated and the raw materials increase, which is not conducive to lightweight design, and the deep cavity structure makes casting difficult. On the other hand, since the bowl-shaped plug hole is machined and then sealed with a bowl-shaped plug, the machining cost increases and there is a risk of oil leakage at the bowl-shaped plug, and the cost is also relatively high.
[0035] In view of this, this embodiment proposes a ventilation structure of the electric drive assembly to discharge the oil-liquid mixture of the electric drive in time. Figure 1 and 2 As shown, the opening directions of the box cover 1 and the shell 2 are opposite, and the inner cavity after the two are buckled together has an electric drive system. The rotor of the electric drive system generates heat when it rotates. In the process of electric drive heat dissipation, an oil-liquid mixture containing oil will be carried out.
[0036] In this embodiment, a labyrinth chamber 4 is provided in the box cover 1, and a chamber 3 is provided in the shell 2. The oil-liquid mixed gas first flows through the labyrinth chamber 4, then flows through the chamber 3, and finally flows to the outside. The chamber 3 in this embodiment has a vent hole connected to the outside. The opening trajectory of the chamber 3 in this embodiment is the same as the opening trajectory of the labyrinth chamber 4. After the shell and the box cover are assembled together, the labyrinth chamber 4 opened to the left and the chamber 3 opened to the right completely overlap.
[0037] like Figure 2 As shown, the labyrinth chamber 4 is surrounded by a portion of the first rib 45 and the inner side wall of the box cover 1, and a ventilation channel 5 connected to the interior thereof is provided below the labyrinth chamber 4. The ventilation channel 5 is surrounded by a portion of the first rib 45 extended relative to the labyrinth chamber 4 and the inner side wall of the box cover 1, that is, a portion of the first rib 45 constitutes the outer wall of the labyrinth chamber 4, and the other portion constitutes the outer wall of the ventilation channel 5.
[0038] It can be understood that the labyrinth chamber 4 and the cavity 3 are both formed by depressions punched outward on the box cover 1 and the inner wall of the shell 2. The first rib 45 is a rib inside the box cover 1, which not only serves to increase the strength of the box cover 1, but also can reduce the amount of oil thrown into the ventilation channel 5 and the labyrinth chamber 4 when the electric drive rotor rotates.
[0039] In this embodiment, after the box cover 1 and the shell 2 are buckled, the opening directions of the labyrinth chamber 4 and the chamber 3 are opposite, the box surface of the labyrinth chamber 4 completely overlaps with the box surface of the chamber 3, and the two are arranged left and right. The labyrinth chamber 4 and the chamber 3 form an inner cavity, and the ventilation channel 5 is located below the structure after the two are buckled. The ventilation channel 5 is connected with the labyrinth chamber 4, and the ventilation channel 5 plays a diversion role to guide the oil-liquid mixed gas into the labyrinth chamber 4. Therefore, after the box cover 1 and the shell 2 are buckled, the cavity after the box cover 1 and the shell 2 are buckled can only circulate with the outside through the ventilation hole of the chamber 3, and then the oil-liquid mixed gas can flow out through the route of the ventilation channel 5-labyrinth chamber 4-chamber 3, but can only be introduced into the labyrinth chamber 4 and the chamber 3 through the ventilation channel 5.
[0040] The chamber 3 may also be located above or obliquely above the labyrinth chamber 4 , as long as the liquid-gas mixture can flow out through the route of the ventilation channel 5 - labyrinth chamber 4 - chamber 3 .
[0041] like Figure 3 and Figure 6 As shown, a first baffle 41 and a second baffle 42 are provided in the labyrinth chamber 4, and the two are arranged at intervals along the direction of flow of the oil-liquid mixture. A first notch 43 is provided on the first baffle 41, and a second notch 44 is provided on the second baffle 42. The oil-liquid mixture enters the labyrinth chamber 4 through the first notch 43. In this embodiment, the first baffle 41, the second baffle 42 and the first rib 45 are all distributed near the closing surface of the box cover 1.
[0042] In the flow direction of the oil-liquid mixture after entering the labyrinth chamber 4, the first gap 43 and the second gap 44 are staggered, which should be understood as: after the oil-liquid mixture passes through the first gap 43, it enters the labyrinth chamber 4 under the guiding effect of the first gap 43. Since the first gap 43 and the second gap 44 are staggered, most of the oil-liquid mixture flowing into the first gap 43 will not flow directly into the second gap 44, but will hit the second baffle 42 and then return to the space between the first baffle 41 and the second baffle 42, and then flow out of the space between the first baffle 41 and the second baffle 42 from the second gap 44. Therefore, the discontinuity of the first gap 43 and the second gap 44 should be understood as the airflow of the oil-liquid mixture cannot flow out directly from the second gap 44 after passing through the first gap 43.
[0043] After the high-speed oil-liquid mixture flows into the first notch 43, it is intercepted by the second baffle 42. Since the first notch 43 and the second notch 44 are not continuous, the oil-liquid mixture is forcibly diverted to the second notch 44 and flows out from the second notch 44. In this way, the first baffle 41 and the second baffle 42 intercept the oil droplets in the oil-liquid mixture for the first time. After the small oil droplets are intercepted, the small oil droplets gather into large oil droplets, and the large oil droplets flow back to the inside of the electric drive assembly along the first baffle 41, the second baffle 42 and the first rib 45.
[0044] In this embodiment, the number of the second notches 43 is two, which are respectively arranged at the two ends of the top surface of the second baffle 42. The first notch 42 is located at the corresponding positions of the two ends of the first baffle 41 and the second baffle 42. In this embodiment, the two ends of the first baffle 41 are respectively connected to the first rib 45 and the inner wall of the box cover 1, and the two side ends of the second baffle 42 are respectively connected to the first rib 45 and the inner wall of the box cover 1. The first notch 42 is located in the middle of the first baffle 41, so that the oil-gas mixture can fully collide with the first baffle 41 and the second baffle 42 after entering through the first notch 42, so that the high-speed oil-liquid mixture airflow can collide with the first baffle 41 and the second baffle as much as possible, thereby increasing the number of intercepted oil droplets.
[0045] In this embodiment, the second baffle plate 42 is arranged to be tilted downward, forming a V-shape with the first baffle plate 41, so that the oil droplets on the second baffle plate 42 can slide down under the action of gravity.
[0046] In this embodiment, the first rib 45 is inclined downward, so as to reduce the number of oil droplets thrown into the ventilation channel 5 when the electric drive rotor rotates.
[0047] like Figure 4 and Figure 5 As shown, the chamber 3 is surrounded by the second rib 31 and the inner wall of the shell 2. The second rib 31 is located inside the shell 2, which plays a role in improving the strength of the shell 2. At the same time, a chamber is formed in the chamber 3. Before the oil-gas mixture enters the chamber 3 of the shell 4, the oil droplet content in the oil-gas mixture is already very low because the oil-gas mixture has been intercepted (separated) twice. In order to better filter the microparticles in the oil-gas mixture again, the mixed gas needs to be precipitated in the chamber 3 (the flow rate of the mixed gas in the casting cavity is reduced). This requires that the volume of the chamber 3 is large enough. After the mixed gas reaches the chamber 3, the flow rate of the mixed gas is greatly reduced, providing time for the tiny particles of oil droplets in the mixed gas to precipitate. After precipitation, the oil droplets converge into oil and flow back to the inside of the electric drive assembly along the first baffle 41, the second baffle 42 and the first rib 45. However, due to the limitations of the stamping process and the volume inside the shell 2, the volume of the chamber inside the chamber 3 cannot be made particularly large. Therefore, when simulating the flow of the oil-gas mixture, it is necessary to comprehensively consider the flow rate, the feasibility of the stamping process and the capacity of the shell 2.
[0048] In this embodiment, the top of the chamber 3 is provided with a vent plug mounting hole 32, which is used to mount the vent plug 32, and the mounting hole is perpendicular to the chamber 3. The vent plug and the vent plug mounting hole 32 are fitted by interference.
[0049] like Figure 7As shown, the flow mode of the oil-liquid mixture in this embodiment is: after the high-speed oil-liquid mixture flows out from the electric drive, it passes through the intake channel 5, enters the area between the first baffle 41 and the second baffle 42 through the first notch 43, and then enters the chamber 3 through the second notch 44.
[0050] It is understandable that after the high-speed oil-liquid mixture passes through the first notch 42 and enters the area between the first baffle 41 and the second baffle 42, part of the oil-liquid mixture will flow directly to the chamber 3, and the other part will flow to the chamber 3 after passing through the second notch 44. However, after entering the chamber 3, the flow rate will be reduced, so that the oil can be precipitated.
[0051] In this embodiment, the box cover and the shell are radially sealed and assembled, which is convenient for press-fitting, improves assembly efficiency, and saves assembly space. It can reduce the overall layout space and make the electric drive assembly more compact.
[0052] This embodiment also provides an automobile, comprising the ventilation structure of the electric drive assembly described above.
[0053] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by a person skilled in the art based on the present invention is within the protection scope of the present invention.
Claims
1. A ventilation structure of an electric drive assembly, comprising a box cover and a shell, characterized in that: The interior of the box cover and the shell after being buckled together has a labyrinth chamber connected to the outside, and the labyrinth chamber is provided with a first baffle and a second baffle arranged in sequence along the direction of the oil-gas mixture flow, the first baffle is provided with a first notch, the second baffle is provided with a second notch, and the first notch and the second notch are staggered.
2. The ventilation structure of the electric drive assembly according to claim 1, characterized in that: The box cover or the shell has a first convex rib in it, and the labyrinth chamber is formed between a part of the first convex rib and the inner wall of the box cover or the shell, and the first baffle plate and the second baffle plate are both located on the inner side of the first convex rib.
3. The ventilation structure of the electric drive assembly according to claim 2, characterized in that: An air intake passage is formed between the portion of the first rib extending relative to the labyrinth chamber and the box cover or the inner side wall of the shell, so that the oil-gas mixture flows into the first notch through the air intake passage.
4. The ventilation structure of the electric drive assembly according to claim 1, characterized in that: The second notch is located at the end of the second baffle, and the position of the first notch corresponds to a position between the two ends of the second baffle.
5. The ventilation structure of the electric drive assembly according to claim 1, characterized in that: After the box cover and the shell are buckled together, the interior has a cavity connected to the labyrinth chamber, and the cavity is connected to the outside.
6. The ventilation structure of the electric drive assembly according to claim 5, characterized in that: The chamber is located in one of the box cover or the shell, and the labyrinth chamber is located in the other of the box cover or the shell. When the box cover and the shell are buckled together, the openings of the chamber and the labyrinth chamber are arranged facing each other, and the closing surface of the chamber completely overlaps with the closing surface of the labyrinth chamber.
7. The ventilation structure of the electric drive assembly according to claim 5, characterized in that: The box cover or the shell has a second convex rib inside, and the cavity is formed between the second convex rib and the inner side wall of the box cover or the shell.
8. The ventilation structure of the electric drive assembly according to claim 1, characterized in that: The second baffle is arranged to be inclined downward.
9. The ventilation structure of the electric drive assembly according to claim 2, characterized in that: The first convex rib is arranged to be inclined downward.
10. The ventilation structure of the electric drive assembly according to claim 5, characterized in that: A vent plug is provided on the top of the chamber, and the vent plug is located on the box cover or the shell.
11. A car, characterized in that: A ventilation structure comprising an electric drive assembly as described in any one of claims 1-10.