Gearbox ventilation cap

Abstract

A ventilation cap of a gearbox relates to the technical field of gearboxes and comprises a plug body and a filter screen, an air inlet hole, a first condensation oil cavity, a second condensation oil cavity and an exhaust hole are formed in the plug body, and the air inlet hole, the first condensation oil cavity, the second condensation oil cavity and the exhaust hole are communicated in sequence; the filter screen is installed in the air inlet hole and used for filtering oil liquid in the oil-gas mixture entering the first condensation oil cavity from the air inlet hole. The oil-gas separation effect can be improved while the size is reduced, the oil recovery amount is increased, the operation cost is reduced, and disassembly and assembly in a limited space environment are facilitated.

Description

Technical Field

[0001] This invention relates to the field of gearbox technology, and more specifically, to a gearbox vent cap. Background Technology

[0002] In the field of monorail gearboxes for rail transit, gearboxes are typically located under the vehicle and operate in harsh environments, requiring them to withstand rain, snow, and sandstorms. When the gearbox operates at high speeds, the internal pressure increases. If contact seals such as oil seals are used at the shaft connection points, a breather, also known as a vent cap, is generally required to balance the internal and external pressures of the gearbox, thus preventing oil leakage at the seals. Simultaneously, the breather must be waterproof and dirt-proof, providing a two-way seal.

[0003] The inventors discovered that the ventilators in this technology have at least the following problems: Firstly, the internal ventilation path is simple, resulting in weak oil and gas condensation function; Secondly, when it rains, water droplets splash onto the vent cap, and the rainwater can easily enter the vent cap through the vent hole, causing the lubricating oil to emulsify. Summary of the Invention

[0004] The objectives of this invention include, for example, providing a gearbox vent cap that can improve oil-gas separation efficiency, increase oil recovery volume, reduce operating costs, and facilitate disassembly and assembly in confined space environments while reducing volume.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a gearbox vent cap, comprising: The plug body and the filter screen are provided. The plug body is provided with an air inlet, a first condensing oil chamber, a second condensing oil chamber and an exhaust port. The air inlet, the first condensing oil chamber, the second condensing oil chamber and the exhaust port are connected in sequence. The filter screen is installed in the air inlet and is used to filter the oil in the oil-gas mixture that enters the first condensing oil chamber from the air inlet.

[0006] In an optional embodiment, the plug body has a connecting portion inside, through which the first condensing oil chamber is connected to the second condensing oil chamber, and a portion of the first condensing oil chamber is located on the side of the connecting portion away from the air inlet.

[0007] In an optional embodiment, the first condensate oil chamber is configured as an annular chamber, the annular chamber surrounding the second condensate oil chamber.

[0008] In an optional embodiment, the annular cavity has an inner peripheral wall, an outer peripheral wall, and an inclined guide wall. The inner edge of the inclined guide wall is connected to the inner peripheral wall, and the outer edge of the inclined guide wall is connected to the outer peripheral wall. The distance between the inclined guide wall and the port of the air inlet gradually decreases in the direction from the inner edge to the outer edge. The connecting portion is disposed on the inner peripheral wall.

[0009] In an optional embodiment, the connecting portion is configured as a connecting groove, with the opening of the connecting groove facing the air inlet.

[0010] In an optional embodiment, the second condensate oil chamber has an opening, and the opening is located on the same side as the opening of the communicating groove; The gearbox vent cap also includes a baffle, which is connected to the filter screen and / or the plug, and the baffle closes the opening of the communicating groove and the opening.

[0011] In an optional embodiment, the exhaust port has a first port and a second port, the first port being in communication with the second condensate oil chamber, and the distance between the exhaust port and the air inlet gradually decreasing in the direction from the first port to the second port.

[0012] In an optional embodiment, the area of ​​the cross-section of the exhaust port gradually increases in the direction from the first port to the second port; the cross-section is a plane perpendicular to the length direction of the exhaust port.

[0013] In an optional embodiment, the outer surface of the plug is provided with a plurality of thickened portions, which are arranged at intervals in the circumferential direction of the plug.

[0014] In an optional embodiment, the location of the vent hole corresponds to the thickened portion.

[0015] The embodiments of the present invention have at least the following beneficial effects: The gearbox vent cap provided in this embodiment features an air inlet, a first condensing oil chamber, a second condensing oil chamber, and an exhaust port inside the cap body. This design eliminates the need for other components, resulting in a compact structure, small size, and low cost. Furthermore, as the oil-gas mixture passes through the filter screen, most of the oil is filtered and returned to the gearbox. A portion of the oil, along with the oil-gas mixture, enters the first condensing oil chamber, where initial oil-gas separation occurs. The remaining oil-gas mixture, containing a small amount of oil, enters the second condensing oil chamber for a second oil-gas separation. Thus, with the cooperation of the first and second condensing oil chambers, the oil-gas mixture undergoes multiple oil-gas separation operations, resulting in excellent separation efficiency, high oil recovery, and ultimately, minimal oil discharge from the exhaust port, minimizing losses and reducing operating costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the gearbox vent cap provided in this embodiment; Figure 2 This is a cross-sectional view of the gearbox vent cap provided in this embodiment; Figure 3 This is a schematic diagram of the plug body provided in this embodiment; Figure 4 This is a schematic diagram of the structure of a first modified example of the plug provided in this embodiment; Figure 5 This is a schematic diagram of the structure of a second modified example of the plug provided in this embodiment; Figure 6 This is a schematic diagram illustrating the application of the gearbox vent cap provided in this embodiment.

[0018] icon: 100-Plug body; 110-Body body; 111-Air inlet; 112-First condensing oil chamber; 1121-Inner peripheral wall; 1122-Outer peripheral wall; 1123-Slanted guide wall; 113-Exhaust port; 1131-First port; 1132-Second port; 120-Protrusion; 121-Connecting part; 122-Second condensing oil chamber; 130-Clamping part; 140-Thickened part; 150-Crest; 160-Trough; 170-External hexagonal surface; 180-Threaded groove; 200-Filter screen; 300-Baffle. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0025] Please refer to Figure 1 This embodiment provides a gearbox vent cap, which includes a plug body 100 and a filter screen 200. The plug body 100 is provided with an air inlet 111, a first condensing oil chamber 112, a second condensing oil chamber 122 and an exhaust port 113, which are connected in sequence. The filter screen 200 is installed in the air inlet 111 and is used to filter the oil in the oil-gas mixture entering the first condensing oil chamber 112 from the air inlet 111.

[0026] As described above, the working principle of the gearbox vent cap provided in this embodiment is as follows: The plug 100 is fixed to the gearbox by means of screws or other methods. During gearbox operation, the internal temperature rises and the air pressure increases. The resulting oil-gas mixture enters through the air inlet 111 and flows to the first condensing oil chamber 112. It passes through the filter screen 200, and most of the oil is filtered out and flows back into the gearbox from the air inlet 111. Some oil enters the first condensing oil chamber 112 along with the oil-gas mixture. The first oil-gas separation is achieved in the first condensing oil chamber 112. The remaining oil-gas mixture contains less oil and enters the second condensing oil chamber 122 for a second oil-gas separation. In this way, with the cooperation of the first condensing oil chamber 112 and the second condensing oil chamber 122, the oil-gas mixture undergoes multiple oil-gas separation operations, resulting in good separation effect, large oil recovery, and ultimately less oil discharged from the exhaust port 113, resulting in low loss and low operating cost.

[0027] Meanwhile, the plug body 100 is an independent component, which is provided with an air inlet 111, a first condensing oil chamber 112, a second condensing oil chamber 122 and an exhaust port 113. The air inlet 111, the first condensing oil chamber 112, the second condensing oil chamber 122 and the exhaust port 113 do not need to be combined with other components to form the vent cap, which makes the structure compact, small in size and low in cost.

[0028] The following embodiments illustrate the details of the gearbox vent cap of this application by way of example.

[0029] Please refer to Figures 1-5 In this embodiment, optionally, the gearbox vent cap includes a plug body 100, a filter screen 200, and a baffle 300. The filter screen 200 is connected to the plug body 100, and the baffle 300 is installed on the filter screen 200. The baffle 300 can block a portion of the filter screen 200, thereby blocking the oil-gas mixture and forcing the oil-gas mixture to bypass the baffle 300.

[0030] Please refer to Figure 3 Optionally, the plug body 100 includes a connected body 110, a protrusion 120, and a retainer 130. The body 110 is a cylinder with a first end face and a second end face along its axial direction. A groove is provided on the second end face of the body 110, the groove being approximately circular. The protrusion 120 protrudes from the bottom wall of the groove, and the two can be an integral structure. The end of the protrusion 120 away from the bottom wall of the groove is spaced apart from the opening of the groove. The retainer 130 is disposed on the peripheral wall of the groove, and the retainer 130 is located between the protrusion 120 and the opening of the groove. The protrusion 120 divides the groove to form an air inlet 111 and a first condensing oil chamber 112. A connecting portion 121 and a second condensing oil chamber 122 are provided on the end face of the protrusion 120 near the opening of the groove. The connecting portion 121 can be a connecting groove, and the opening of the connecting groove is located on the end face of the protrusion 120 near the opening of the groove. The second condensing oil chamber 122 has an opening located on the end face of the protrusion 120 near the groove opening; that is, the groove opening of the connecting groove and the opening of the second condensing oil chamber 122 are both located on the same side. The air inlet 111 connects to the first condensing oil chamber 112, and the first condensing oil chamber 112 connects to the second condensing oil chamber 122 via the connecting part 121. Simultaneously, the body 110 is provided with an exhaust port 113, one end of which connects to the second condensing oil chamber 122, and the other end of which is located on the outer peripheral surface of the body 110.

[0031] It should be understood that the groove is divided by the protrusion 120 to form an air inlet 111 and a first condensing oil chamber 112. Specifically, the area between the side of the protrusion 120 near the groove opening and the second end face is the air inlet 111, and the area between the side of the protrusion near the groove and the bottom wall of the groove is the first condensing oil chamber 112. The first condensing oil chamber 112 is an annular cavity that surrounds the protrusion 120. In other words, the first condensing oil chamber 112 surrounds the second condensing oil chamber 122.

[0032] Please refer to Figure 3 Furthermore, the first condensing oil chamber 112 has an inner peripheral wall 1121, an outer peripheral wall 1122, and an inclined guide wall 1123. The inner edge of the inclined guide wall 1123 is connected to the inner peripheral wall 1121, and the outer edge of the inclined guide wall 1123 is connected to the outer peripheral wall 1122. The distance between the inclined guide wall 1123 and the port of the air inlet 111 gradually decreases from the inner edge to the outer edge. The inner peripheral wall 1121 is the outer peripheral surface of the protrusion 120, the outer peripheral wall 1122 is part of the groove peripheral wall, and the inclined guide wall 1123 is the bottom wall of the groove. With this design, when the oil-gas mixture is separated in the first condensing oil chamber 112, the oil can flow along the inclined guide wall 1123 to the outer peripheral wall 1122, and the oil flows back into the gearbox along the outer peripheral wall 1122. This reduces the amount of oil flowing to the connecting part 121 and reduces the amount of oil entering the second condensing oil chamber 122, which is beneficial for the gas-liquid separation of the oil-gas mixture in the second condensing oil chamber 122.

[0033] Furthermore, since the connecting portion 121 is located at the end of the protrusion 120 away from the inclined guide wall 1123, a portion of the first condensing oil chamber 112 is located on the side of the connecting portion 121 away from the air inlet 111, and the distance between the inclined guide wall 1123 and the connecting portion 121 is maximized. The oil-gas mixture entering the first condensing oil chamber 112 from the air inlet 111 flows in a zigzag pattern in the first condensing oil chamber 112, and the gas-liquid mixture flows for a long time in the first condensing oil chamber 112, resulting in good gas-liquid separation effect.

[0034] Obviously, in other embodiments, the first condensing oil chamber 112 can be a recess, and the number of first condensing oil chambers 112 can be multiple and arranged at intervals around the second condensing oil chamber 122.

[0035] Furthermore, there can be multiple connecting parts 121, with multiple connecting parts 121 arranged at intervals around the second condensing oil chamber 122.

[0036] Please refer to Figure 3 and Figure 4 Furthermore, the clip 130 can be an inverted buckle or a retaining ring, etc. There can be multiple inverted buckles, or it can be set as a single ring-shaped inverted buckle.

[0037] Please refer to Figure 1 Furthermore, the outer peripheral surface of the body 110 is provided with a plurality of thickened portions 140, which are spaced apart in the circumferential direction of the plug body 100. A concave surface is formed between adjacent thickened portions 140. In this way, a continuous wave crest 150 and wave trough 160 structure is formed on the outer peripheral surface of the body 110. That is, the area with the thickened portions 140 forms a wave crest 150, and the area between adjacent thickened portions 140 forms a wave trough 160. The thickness of the body 110 at the wave trough 160 position is thin, resulting in high heat conduction efficiency. The oil-gas mixture located in the first condensing oil chamber 112 can exchange heat efficiently with the position where the wave trough 160 is located, thereby improving the oil-gas separation efficiency. In addition, the body 110 has high structural strength at the position of the thickened portions 140, so the exhaust port 113 can be set at the position corresponding to the thickened portions 140.

[0038] It should be understood that the number of exhaust holes 113 can be multiple, equal to the number of thickened portions 140, to improve exhaust efficiency. For example, in one embodiment, the number of thickened portions 140 and exhaust holes 113 are both six.

[0039] Furthermore, the outer peripheral surface of the body 110 can be configured as an external hexagonal surface 170 and a threaded groove 180, with the external hexagonal surface 170 close to the first end face and the threaded groove 180 close to the second end face. The external hexagonal surface 170 can be clamped with a tool, and the body 110 can be tightened to allow the threaded groove 180 to engage with the threaded hole on the gearbox, facilitating disassembly and assembly in confined spaces.

[0040] Please refer to Figure 3 Optionally, the vent 113 has a first port 1131 and a second port 1132. The first port 1131 is connected to the second condensing oil chamber 122. The distance between the vent 113 and the air inlet 111 gradually decreases from the first port 1131 to the second port 1132. That is, when the vent cap is in working condition, the air inlet 111 faces downward, and the height of the first port 1131 is higher than the height of the second port 1132. When the gearbox speed decreases or stops, the pressure inside the gearbox decreases, and the vent cap will draw air into the gearbox. When encountering rainy weather, when rainwater splashes onto the plug 100 of the vent cap, the rainwater may enter the vent cap through the vent 113 under the action of breathing, causing the lubricating oil to emulsify. In this embodiment, the vent 113 is set to be inclined downward, and the water droplets will flow outward under the action of gravity. At the same time, the inclined design lengthens the water vapor condensation path, reducing the risk of water vapor entering the vent, thereby achieving a waterproof effect.

[0041] Please refer to Figure 5Furthermore, the cross-sectional area of ​​the vent hole 113 gradually increases in the direction from the first port 1131 to the second port 1132; the cross-section is a plane perpendicular to the length direction of the vent hole 113, that is, the vent hole 113 is set in a trumpet shape, which can further increase the difficulty for water droplets to enter the interior of the plug body 100 along the vent hole 113 and improve the waterproof effect.

[0042] In this embodiment, optionally, the filter screen 200 is provided with a fixing groove, and the baffle 300 is embedded in the fixing groove. The filter screen 200 is installed in the air inlet 111, the baffle 300 contacts the end face of the protrusion 120 away from the inclined guide wall 1123, and the filter screen 200 contacts the retainer 130. In this way, the baffle 300 and the filter screen 200 are clamped by the protrusion 120 and the retainer 130, and the baffle 300 closes the slot of the connecting part 121 and the opening of the second condensing oil chamber 122. When the oil-gas mixture enters through the air inlet 111, as it passes through the filter screen 200, the oil-gas mixture flowing towards the connecting part 121 and the second condensing oil chamber 122 is blocked by the baffle 300. It does not directly enter the second condensing oil chamber 122, but instead bypasses the baffle 300 and enters the first condensing oil chamber 112. In this way, the flow path of the oil-gas mixture in the filter screen 200 is increased, allowing the filter screen 200 to intercept more oil. It also reduces the amount of oil-gas mixture that directly enters the second condensing oil chamber 122, allowing most of the oil-gas mixture to first enter the first condensing oil chamber 112 for thorough separation, thereby improving the oil-gas separation effect.

[0043] The working principle of the gearbox vent cap provided in this embodiment is as follows: Please refer to Figure 6 The plug body 100 is screwed and fixed to the gearbox, with the air inlet 111 facing and communicating with the internal space of the gearbox. When an oil-gas mixture is generated during gearbox operation, the oil-gas mixture enters the plug body 100 through the air inlet 111. When it passes through the filter screen 200, most of the oil is blocked by the filter and flows back into the gearbox through the air inlet 111, achieving the first oil-gas separation. Since the oil-gas mixture is blocked by the baffle 300, the oil-gas mixture that passes through the filter screen 200 basically enters the first condensing oil chamber 112. The outside cold air exchanges heat with the oil-gas mixture through the body 110, and the oil-gas mixture achieves the second oil-gas separation in the first condensing oil chamber 112 after being cooled. The remaining oil-gas mixture enters the second condensing oil chamber 122 through the connecting part 121, where a third oil-gas separation is achieved. In this way, with the cooperation of the filter screen 200, the first condensing oil chamber 112 and the second condensing oil chamber 122, the oil-gas mixture undergoes multiple oil-gas separation operations, resulting in good separation effect, large oil recovery volume, and ultimately less oil discharged from the exhaust port 113, resulting in low loss and low operating cost.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A gearbox vent cap, characterized in that, include: The plug body (100) and the filter screen (200) are provided inside the plug body (100), which has an air inlet (111), a first condensing oil chamber (112), a second condensing oil chamber (122) and an exhaust port (113). The air inlet (111), the first condensing oil chamber (112), the second condensing oil chamber (122) and the exhaust port (113) are connected in sequence. The filter screen (200) is installed in the air inlet (111) and is used to filter the oil in the oil-gas mixture that enters the first condensing oil chamber (112) from the air inlet (111).

2. The gearbox vent cap according to claim 1, characterized in that: The plug body (100) has a connecting part (121) inside, and the first condensing oil chamber (112) is connected to the second condensing oil chamber (122) through the connecting part (121). A part of the first condensing oil chamber (112) is located on the side of the connecting part (121) away from the air inlet (111).

3. The gearbox vent cap according to claim 2, characterized in that: The first condensing oil chamber (112) is configured as an annular chamber, which surrounds the second condensing oil chamber (122).

4. The gearbox vent cap according to claim 3, characterized in that: The annular cavity has an inner peripheral wall (1121), an outer peripheral wall (1122), and an inclined guide wall (1123). The inner edge of the inclined guide wall (1123) is connected to the inner peripheral wall (1121), and the outer edge of the inclined guide wall (1123) is connected to the outer peripheral wall (1122). The distance between the inclined guide wall (1123) and the port of the air inlet (111) gradually decreases in the direction from the inner edge to the outer edge. The connecting part (121) is disposed on the inner peripheral wall (1121).

5. The gearbox vent cap according to any one of claims 2-4, characterized in that: The connecting part (121) is configured as a connecting groove, and the opening of the connecting groove faces the air inlet (111).

6. The gearbox vent cap according to claim 5, characterized in that: The second condensing oil chamber (122) has an opening, and the opening is located on the same side as the opening of the communicating groove; The gearbox vent cap also includes a baffle (300), which is connected to the filter screen (200) and / or the plug (100), and the baffle (300) closes the opening of the communicating groove and the opening.

7. The gearbox vent cap according to claim 1, characterized in that: The exhaust port (113) has a first port (1131) and a second port (1132). The first port (1131) is connected to the second condensing oil chamber (122). The distance between the exhaust port (113) and the air inlet (111) gradually decreases in the direction from the first port (1131) to the second port (1132).

8. The gearbox vent cap according to claim 7, characterized in that: The area of ​​the cross-section of the exhaust port (113) gradually increases in the direction from the first port (1131) to the second port (1132); the cross-section is a plane perpendicular to the length direction of the exhaust port (113).

9. The gearbox vent cap according to claim 1, characterized in that: The outer surface of the plug (100) is provided with a plurality of thickened portions (140), which are arranged at intervals in the circumferential direction of the plug (100).

10. The gearbox vent cap according to claim 9, characterized in that: The position of the vent (113) corresponds to the thickened portion (140).

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