Valve assembly for speed reducer, speed reducer and electric drive system

Abstract

The utility model provides a valve assembly for a speed reducer, the speed reducer and an electric drive system, and the valve assembly comprises a valve body (21) used for being connected to a shell of the speed reducer; the filtering unit is arranged on the valve main body (21); the limiting part (251) is annular, a vent hole (252) is formed in the center of the limiting part (251), and the limiting part (251) is arranged below the filtering unit; the floating plug (26) is arranged below the limiting part (251), and the density of the floating plug (26) is smaller than that of lubricating oil in the speed reducer, so that the floating plug (26) can float on the surface of the lubricating oil when the lubricating oil enters the valve assembly, the floating plug (26) can block the vent hole (252), and the vent hole (252) is communicated with the limiting part (251). And the lubricating oil is prevented from being in contact with the filtering unit.

Description

Technical Field

[0001] This application belongs to the field of power transmission technology for electric vehicles, and specifically relates to a valve assembly for a reducer, a reducer, and an electric drive system. Background Technology

[0002] Electric vehicle reducers typically use oil for lubrication. Because air exists inside the reducer, it expands or contracts with temperature changes, creating a pressure difference between the inside and outside of the reducer. This pressure difference can cause the reducer's shaft seal to fail, leading to oil leakage. Therefore, one possible technical solution uses a breather valve to balance the pressure difference between the inside and outside of the reducer. The reducer body is connected to the breather valve via a rubber hose. The breather valve includes a filter membrane and a fiber filter element. The fiber filter element is located between the filter membrane and the reducer, filtering oil mist from the air inside the reducer and preventing direct contact between the oil mist and the filter membrane, which would cause the filter membrane to lose its breathing ability. However, neither the filter membrane nor the fiber filter element can directly contact liquid lubricating oil, as liquid lubricating oil can clog both the filter membrane and the fiber filter element.

[0003] However, the lubricating oil inside the reducer may flow into the fiber filter element due to the agitation of the gears and the expansion of the internal gas, causing the fiber filter element to become clogged and lose its ability to breathe. Utility Model Content

[0004] This application aims to provide a valve assembly for a speed reducer that avoids or reduces lubricating oil contact with the fiber filter element and filter membrane, thereby preventing clogging of the fiber filter element and filter membrane.

[0005] Embodiments of this application provide a valve assembly for a speed reducer, comprising:

[0006] A valve body for connecting to the housing of the reducer;

[0007] A filter unit is disposed on the valve body;

[0008] The limiting part is annular, and a vent hole is formed in the center of the limiting part. The limiting part is located below the filter unit.

[0009] A floating plug is disposed below the limiting part. The density of the floating plug is less than that of the lubricating oil in the reducer. Therefore, the floating plug can float on the surface of the lubricating oil when the lubricating oil enters the valve assembly. The floating plug can block the vent hole to prevent the lubricating oil from contacting the filter unit.

[0010] In at least one possible implementation, the floating plug is provided with a sealing portion, which is cylindrical and capable of inserting into the vent hole when floating, thereby blocking the vent hole.

[0011] When the floating plug does not float, the sealing part does not block the vent.

[0012] In at least one possible implementation, the floating plug is provided with a vent groove that connects the bottom surface of the floating plug to the peripheral surface of the floating plug.

[0013] In at least one possible implementation, the valve assembly further includes a connecting pipe, the valve body being connected to the housing of the reducer via the connecting pipe, the limiting portion being disposed on the connecting pipe, and the floating plug being disposed inside the connecting pipe, the outer diameter of the floating plug being smaller than the inner diameter of the connecting pipe.

[0014] In at least one possible implementation, the vent hole is a conical hole, with the inner diameter of the conical hole being larger the closer it is to the side where the floating plug is located. The sealing part is conical, and the conical surface of the sealing part mates with the conical surface of the vent hole.

[0015] In at least one possible implementation, the floating plug is hollow and closed.

[0016] In at least one possible implementation, the filtration unit includes a filter membrane and a fiber filter element, with the filter membrane disposed downstream of the fiber filter element in the direction in which the reducer exhausts gas to the outside.

[0017] In at least one possible implementation, the density of the floating plug is less than 0.8 g / cm³. 3 .

[0018] The embodiments of this application also propose a speed reducer, including the valve assembly described in any of the above technical solutions.

[0019] The embodiments of this application further propose an electric drive system, including the valve assembly described in any of the above technical solutions.

[0020] By adopting the above technical solution, when lubricating oil enters the valve assembly, the floating plug rises and blocks the vent, preventing the lubricating oil from contacting the filter unit, thus avoiding clogging of the filter unit and extending its service life. When the lubricating oil flows out of the valve assembly, the floating plug can fall back under the action of gravity, realizing the venting function. Attached Figure Description

[0021] Figure 1 A schematic diagram of a partial structure of a reducer in an electric drive system according to an embodiment of this application is shown.

[0022] Figure 2 A schematic diagram of the valve assembly of a reducer in an electric drive system according to an embodiment of this application is shown.

[0023] Figure 3 A cross-sectional view of the valve assembly of the reducer of an electric drive system according to an embodiment of this application is shown.

[0024] Figure 4 A partially enlarged cross-sectional view of the reducer of an electric drive system according to an embodiment of this application is shown.

[0025] Figure 5 A schematic diagram of the floating plug of the valve assembly of the reducer of an electric drive system according to an embodiment of this application is shown.

[0026] Figure 6 A structural schematic diagram of the floating plug of the valve assembly of the reducer of an electric drive system according to an embodiment of this application is shown from another angle.

[0027] Figure 7 A cross-sectional view of the connecting pipe of the valve assembly of the reducer of an electric drive system according to an embodiment of this application is shown.

[0028] Explanation of reference numerals in the attached figures

[0029] 100 speed reducer

[0030] 1. Reducer housing; 11. Valve connection.

[0031] 2. Valve assembly 21. Valve body 22. Filter membrane 23. Fiber filter element 24. Valve cover

[0032] 25 Connecting pipe 251 Limiting part 252 Vent hole

[0033] 26 Floating plug 261 Sealing part 262 Vent groove

[0034] 27 Blocking Section Detailed Implementation

[0035] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0036] like Figures 1 to 7 As shown, an embodiment of this application proposes an electric drive system, which includes a motor and a reducer 100, wherein the output shaft of the motor can be connected to the reducer 100.

[0037] The reducer 100 includes a reducer housing 1 and a valve assembly 2. The reducer housing 1 may be provided with a valve connection portion 11, which may be a tubular part protruding from the main body of the reducer housing 11 and may communicate with the interior of the reducer housing 1. The valve assembly 2 may be connected to the valve connection portion 11, and through the valve assembly 2, the interior of the reducer housing 1 may be connected to the external atmosphere, thereby balancing the air pressure difference.

[0038] Valve assembly 2 includes valve body 21, filter unit, valve cover 24, connecting pipe 25 and floating plug 26.

[0039] The filtration unit includes a filter membrane 22 and a fiber filter element 23. A valve cover 24 can be connected to a valve body 21, and the valve body 21 and valve cover 24 can form a receiving portion. The fiber filter element 23 is disposed within the receiving portion inside the valve body 21, and the filter membrane 22 can be disposed at the end of the valve body 21. The fiber filter element 23 is located between the filter membrane 22 and the reducer housing 1, and in the direction of exhaust from the reducer to the outside, the filter membrane 22 is disposed downstream of the fiber filter element 23. The valve body 21 can surround the fiber filter element 23, and the filter membrane 22 can be located above the fiber filter element 23. A gap can be formed between the valve cover 24 and the valve body 21, allowing the receiving portion to communicate with the atmosphere.

[0040] When the gas pressure inside the reducer housing 1 is high and exhausts to the outside through the valve assembly 2, the gas first passes through the fiber filter element 23 and then through the filter membrane 22. The fiber filter element 23 can filter the oil mist in the gas and prevent the oil mist from directly contacting the filter membrane 22. The filter membrane 22 can be made of materials with waterproof, dustproof and breathable functions, such as polytetrafluoroethylene (PTFE).

[0041] like Figure 3 , Figure 4 and Figure 7As shown, the valve body 21 can be connected to the valve connection part 11 via a connecting pipe 25, which can be made of rubber, silicone, plastic, etc. The connecting pipe 25 can be provided with a limiting part 251, which can be annular (e.g., circular), and a vent hole 252 can be formed at the center of the limiting part 251. The limiting part 251 can be located below the filter unit. A floating plug 26 can be located inside the connecting pipe 25, and the outer diameter of the floating plug 26 can be slightly smaller than the inner diameter of the connecting pipe 25, allowing the floating plug 26 to move up and down along the connecting pipe 25 inside the connecting pipe 25. By placing the floating plug 26 and the limiting part 251 in the connecting pipe 25, the isolation of lubricating oil from the filter membrane and fiber filter element can be achieved at a lower cost without changing the structure of the valve body 21. Furthermore, the gap between the floating plug 26 and the wall of the connecting pipe 25 allows gas to flow from one axial side of the floating plug 26 to the other axial side. The floating plug 26 can be located below the limiting part 251, which can restrict the upward movement of the floating plug 26. Optionally, the vent 252 can be a tapered hole (e.g., a conical hole), and the inner diameter of the tapered hole is larger the closer it is to the floating plug 26.

[0042] like Figure 3 and Figure 4 As shown, the valve body 21 may be provided with a blocking part 27, which may be disposed between the fiber filter element 23 and the vent 252. The blocking part 27 may form an S-shaped channel to block impurities in the filtered gas.

[0043] The density of the floating plug 26 can be less than the density of the oil; for example, the density of the floating plug 26 can be less than 0.8 g / cm³. 3 Thus, the floating plug 26 can float on the surface of the lubricating oil. When the lubricating oil inside the reducer flows out from the valve connection 11 and flows to the filter membrane 22 and the fiber filter element 23, the floating plug 26 floating on the surface of the lubricating oil can block the vent 252 before the lubricating oil reaches the vent hole 252, preventing the lubricating oil from passing through the vent hole 252 and contacting the fiber filter element 23 and the filter membrane 22.

[0044] It is understood that the density of the floating plug 26 refers to the overall density of the floating plug 26 component, rather than the density of the material of the floating plug 26. Optionally, the floating plug 26 can be hollow and closed.

[0045] like Figures 3 to 6As shown, the floating plug 26 is provided with a sealing part 261, which can be conical. When the floating plug 26 floats on the lubricating oil, the sealing part 261 can be inserted into the vent hole 252, isolating the two sides of the limiting part 251. Optionally, the sealing part 261 can be conical, and the conical surface of the sealing part 261 can mate with the conical surface of the vent hole 252, thereby completely blocking the vent hole 252 and achieving a better sealing effect.

[0046] The floating plug 26 is provided with a vent groove 262, which connects the bottom surface and the peripheral surface of the floating plug 26. The sealing part 261 and the vent groove 262 can be provided at opposite ends of the floating plug 26. For example, the vent groove 262 can be provided on the bottom surface of the floating plug 26. The vent groove 262 can extend radially along the floating plug 26 and extend to the radially outer edge, so that the gas at the bottom of the floating plug 26 can be vented to the peripheral surface of the floating plug 26 through the vent groove 262.

[0047] Under normal conditions, the floating plug 26 can be pressed against the valve connection 11 under the action of gravity. The gas inside the reducer can enter the connecting pipe 25 through the vent groove 262 of the floating plug 26, and then be discharged to the atmosphere through the vent hole 252 of the connecting pipe 25 and the valve body 21. The outside atmosphere can also enter the reducer through the above path.

[0048] Under certain extreme conditions (such as when gears agitate oil, when a vehicle is driving on an inclined road, or when a vehicle makes a rapid turn, accelerates suddenly, or decelerates suddenly), when lubricating oil (liquid) enters the connecting pipe 25, the floating plug 26 will float upwards under the buoyancy of the lubricating oil, allowing the sealing part 261 of the floating plug 26 to insert into the vent hole 252, thus blocking the lubricating oil (liquid) from contacting the fiber filter element 23 and the filter membrane 22. This prevents the filter unit from being clogged by lubricating oil and extends the service life of the filter unit. When the lubricating oil flows out of the valve assembly, the floating plug 26 can be pressed against the valve connecting part 11 under the action of gravity, returning to normal and realizing the venting function.

[0049] This application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of this application under the guidance of this application, without departing from the scope of this application. In addition, the following description is provided.

[0050] (1) In the above embodiment, the floating plug 26 is disposed inside the connecting pipe 25, but this application is not limited to this. In other possible embodiments, the floating plug may be disposed inside the valve body, and the limiting part and the vent hole that cooperate with the floating plug may also be disposed in the valve body.

[0051] (2) In the above embodiment, the vent groove 262 is provided on the bottom surface of the floating plug 26, but this application is not limited to this. In other possible embodiments, the vent groove can be provided on the top surface of the valve connection portion 11. In addition, the vent groove can also be provided on the circumferential surface of the floating plug 26. For example, the vent groove can extend from the bottom surface of the floating plug to the circumferential surface.

[0052] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0053] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0054] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or within another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0056] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. A valve assembly for a speed reducer, characterized in that, include: A valve body for connecting to the housing of the reducer; A filter unit is disposed on the valve body; The limiting part is annular, and a vent hole is formed in the center of the limiting part. The limiting part is located below the filter unit. A floating plug is disposed below the limiting part. The density of the floating plug is less than that of the lubricating oil in the reducer. Therefore, the floating plug can float on the surface of the lubricating oil when the lubricating oil enters the valve assembly. The floating plug can block the vent hole to prevent the lubricating oil from contacting the filter unit.

2. The valve assembly for a speed reducer according to claim 1, characterized in that, The floating plug is provided with a sealing part, which is cylindrical and can be inserted into the vent hole when it floats, thereby blocking the vent hole. When the floating plug does not float, the sealing part does not block the vent.

3. The valve assembly for a speed reducer according to claim 1, characterized in that, The floating plug is provided with a venting groove, which connects the bottom surface of the floating plug and the peripheral surface of the floating plug.

4. The valve assembly for a speed reducer according to claim 1, characterized in that, The valve assembly further includes a connecting pipe, through which the valve body is connected to the housing of the reducer. The limiting part is disposed in the connecting pipe, and the floating plug is disposed inside the connecting pipe. The outer diameter of the floating plug is smaller than the inner diameter of the connecting pipe.

5. The valve assembly for a speed reducer according to claim 2, characterized in that, The vent hole is a conical hole, and the inner diameter of the conical hole is larger the closer it is to the floating plug. The sealing part is conical, and the conical surface of the sealing part matches the conical surface of the vent hole.

6. The valve assembly for a speed reducer according to claim 1, characterized in that, The floating plug is hollow and closed.

7. The valve assembly for a speed reducer according to claim 1, characterized in that, The filtration unit includes a filter membrane and a fiber filter element. In the direction in which the reducer exhausts gas to the outside, the filter membrane is disposed downstream of the fiber filter element.

8. The valve assembly for a speed reducer according to claim 1, characterized in that, The density of the floating plug is less than 0.8 g / cm³. 3 .

9. A speed reducer, characterized in that, The valve assembly includes any one of claims 1 to 8.

10. An electric drive system, characterized in that, The valve assembly includes any one of claims 1 to 8.

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