Dynamic seal oil leakage prevention structure suitable for rail transit bogie gear box

Abstract

The utility model relates to the technical field of bogies, in particular to a dynamic seal oil leakage prevention structure suitable for a rail transit bogie gearbox, which comprises an oil collecting structure and an oil backflow structure. The oil collecting structure comprises a shaft sleeve arranged on the side wall of the gear box body, a plurality of sealing ring grooves and at least one oil collecting ring groove are formed in the movable sealing face, matched with the axle, of the shaft sleeve, the oil collecting ring groove is formed among the sealing ring grooves, and the width of the oil collecting ring groove is larger than that of the sealing ring groove. The oil liquid backflow structure comprises an oil liquid backflow flow channel, and the oil liquid backflow flow channel communicates with the bottom of the oil collecting ring groove and the interior of the gear box body. The gear box has the advantages that the oil collecting ring groove is formed in the shaft sleeve, so that leaked oil is collected by the oil collecting ring groove, the oil collected by the oil collecting ring groove finally returns to the interior of the gear box body through the oil backflow channel, the oil is prevented from leaking from the gear box body, and the lubricating reliability of the gear box in the long-term operation process is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of bogies, in particular to a dynamic sealing oil leakage prevention structure suitable for a gear box of a rail transit bogie. Background Art

[0002] At present, the power bogie wheelsets of locomotives, EMUs, subways, etc. used in the rail transit field are equipped with gearboxes. The gearboxes and wheelset axles are usually provided with a labyrinth dynamic seal structure to adapt to the rotation of the axles and prevent the leakage of lubricating oil in the box.

[0003] When the gears in the gearbox rotate at high speed, a pressure difference is easily formed inside and outside the box. Coupled with factors such as high-frequency and severe vibration of the wheel and rail, it is easy for the lubricating oil to leak across the dynamic seal despite the installation of a labyrinth dynamic seal structure. Long-term leakage of the lubricating oil can easily have an adverse effect on the reliability of gear lubrication. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a dynamic sealing oil leakage prevention structure suitable for a rail transit bogie gear box.

[0005] The purpose of the utility model is achieved through the following technical solutions: a dynamic seal anti-oil leakage structure suitable for a rail transit bogie gear box, comprising an oil collection structure and an oil reflux structure.

[0006] The oil collection structure comprises a shaft sleeve arranged on the side wall of the gear housing, a plurality of sealing ring grooves and at least one oil collecting ring groove are provided on the dynamic sealing surface of the shaft sleeve that cooperates with the axle, the oil collecting ring groove is arranged between the plurality of the sealing ring grooves, and the width of the oil collecting ring groove is greater than the width of the sealing ring groove;

[0007] The oil return structure comprises an oil return flow channel, and the oil return flow channel is connected with the bottom of the oil collecting ring groove and the interior of the gear box body.

[0008] The utility model provides an oil collecting ring groove on the shaft sleeve to collect the oil that passes through the sealing ring groove and return it to the gear box body through the oil return structure, so that the oil will not leak during the long-term operation of the gear box, thereby ensuring the lubrication performance of the gear box under long-term use.

[0009] In some embodiments, a sealing strip is disposed in the sealing ring groove for forming a dynamic seal with the axle, and a dynamic seal is formed between the sealing strip and the axle to prevent oil leakage.

[0010] In some embodiments, the sealing strip includes a felt strip or a rubber strip. The felt strip or the rubber strip has good sealing performance and can improve the sealing effect of the shaft sleeve.

[0011] In some embodiments, a reflux box is provided on the outer wall of the gear housing, the top of the reflux box is connected to the bottom of the sleeve, and a reflux chamber is formed between the reflux box and the side wall and sleeve of the gear housing; a first opening is provided at the bottom of the oil collecting ring groove, and a second opening is provided on the side wall of the gear housing, the first opening and the second opening are both connected to the reflux chamber, and the first opening, the second opening and the reflux chamber together form the oil reflux channel. Providing a reflux box on the outer wall of the gear housing is low-cost and easy to produce compared to directly opening a reflux channel on the sleeve. By arranging the reflux box below the sleeve, gravity can be used to make the oil in the oil collecting ring groove flow naturally into the reflux box.

[0012] In some embodiments, the second opening is located on the side wall of the gear housing near the bottom of the reflux chamber. The second opening is located at the bottom of the reflux chamber, so that all the oil temporarily stored in the reflux chamber can flow back into the gear housing to avoid accumulation of oil in the reflux box.

[0013] In some embodiments, an oil baffle is provided on the inner wall of the gear box body at a position corresponding to the second opening, and a gap is provided between the oil baffle and the second opening. During the operation of the gear box, the oil in the gear box will splash due to the rotation of the gears, and the high-speed rotation of the gears will cause the air pressure in the gear box body to change. In order to prevent the oil in the gear box body from flowing back into the reflux box through the second opening, an oil baffle is provided to shield the second opening to prevent the oil from splashing in.

[0014] In some embodiments, the cross section of the oil baffle is U-shaped, and its two sides are connected to the inner wall of the gear housing and shield the second opening. The cross section of the oil baffle is U-shaped, so that there is a certain gap between the oil baffle and the second opening, so that the oil in the reflux box can flow into the gear housing from the second opening while preventing the oil in the gear housing from splashing into the reflux box from the second opening.

[0015] In some embodiments, an oil slinger is further included, and the oil slinger is arranged at one end of the shaft sleeve located in the gear box body. The oil slinger is arranged at one end of the shaft sleeve located in the gear box body to reduce the oil that penetrates into the gap between the axle and the shaft sleeve, thereby reducing oil leakage from the source.

[0016] The utility model has the following advantages:

[0017] During the operation of the gearbox, oil will leak through the gap between the shaft sleeve and the axle. The utility model provides an oil collecting ring groove on the shaft sleeve on the gearbox body. The oil collecting ring groove can collect this part of the oil and return it to the gearbox body through an oil return flow channel provided at the bottom of the oil collecting ring groove. An oil baffle is provided in the gearbox body to prevent oil splashing and backflow, reduce oil leakage in the gearbox body, and keep the gearbox in good lubrication performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a dynamic seal oil leakage prevention structure applicable to a rail transit bogie gearbox of the utility model;

[0019] Figure 2 for Figure 1 Sectional view at AA;

[0020] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0021] In the figure: 1, gear box body; 11, second opening; 2, shaft sleeve; 21, sealing ring groove; 22, oil collecting ring groove; 221, first opening; 3, reflux box; 4, oil baffle plate; 5, oil baffle ring; 6, sealing strip; 7, reflux chamber. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0023] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0024] like Figure 1-Figure 3 As shown, a dynamic seal anti-oil leakage structure suitable for a rail transit bogie gearbox includes an oil collection structure and an oil reflux structure.

[0025] The oil collection structure includes a shaft sleeve 2 arranged on the side wall of the gear housing 1, and a plurality of sealing ring grooves 21 and at least one oil collecting ring groove 22 are provided on the dynamic sealing surface of the shaft sleeve 2 that cooperates with the axle. The oil collecting ring groove 22 is arranged between the plurality of the sealing ring grooves 21, and the width of the oil collecting ring groove 22 is greater than the width of the sealing ring groove 21;

[0026] The oil return structure includes an oil return flow channel, and the oil return flow channel communicates with the bottom of the oil collecting ring groove 22 and the interior of the gear box body 1.

[0027] Specifically, in this embodiment, the shaft sleeve 2 is fixedly connected to the gear housing 1, and the axle is rotatably connected to the shaft sleeve 2. In this embodiment, two sealing ring grooves 21 and one oil collecting ring groove 22 are provided, wherein the oil collecting ring groove 22 is provided between the two sealing ring grooves 21. The width of the oil collecting ring groove 22 is greater than the width of the sealing ring groove 21.

[0028] During the operation of the gearbox, the gears drive the axle to rotate highly, causing the oil in the gearbox body 1 to splash. Some of the oil splashes into the gap between the dynamic seal of the axle and the shaft sleeve 2, causing leakage. When the oil passes through the oil collecting ring groove 22, since the oil collecting ring groove 22 is an empty groove and is wider than the sealing ring groove 21, the oil will flow into the oil collecting ring groove 22. After the oil flows into the oil collecting ring groove 22, it is collected at the bottom of the oil collecting ring groove 22 under the action of its own gravity. At this time, the oil flows back to the gearbox body 1 through the oil reflux channel at the bottom of the oil collecting ring groove 22, thereby achieving the purpose of preventing oil leakage and ensuring that the lubrication performance of the gearbox is good during long-term operation.

[0029] Preferably, a sealing strip 6 for forming a dynamic seal with the axle is arranged in the sealing ring groove 21. The sealing strip 6 is arranged in the sealing ring groove 21, and a dynamic seal is formed between the sealing strip 6 and the axle to reduce leakage of oil.

[0030] Preferably, the sealing strip 6 comprises a felt strip or a rubber strip. Felt and rubber have good sealing performance and can slide relative to the axle to form a dynamic seal.

[0031] Preferably, a reflux box 3 is provided on the outer wall of the gear housing 1, the top of the reflux box 3 is connected to the bottom of the sleeve 2, and a reflux chamber 7 is formed between the reflux box 3 and the side wall of the gear housing 1 and the sleeve 2; a first opening 221 is provided at the bottom of the oil collecting ring groove 22, and a second opening 11 is provided on the side wall of the gear housing 1, and the first opening 221 and the second opening 11 are both connected to the reflux chamber 7, and the first opening 221, the second opening 11 and the reflux chamber 7 together form the oil reflux channel.

[0032] Specifically, in this embodiment, the reflux box 3 is arranged on the outer wall of the gear housing 1 and is located at the bottom of the shaft sleeve 2, and the edge of the reflux box 3 is welded to the gear housing 1 and the shaft sleeve 2. In this embodiment, the first opening 221 penetrates the shaft sleeve 2, so that the oil collecting ring groove 22 is connected with the reflux chamber 7, and the first opening 221, the reflux chamber 7 and the second opening 11 together form an oil reflux flow channel, and the oil in the oil collecting ring groove 22 flows back to the gear housing 1 through the oil reflux flow channel, which reduces oil leakage.

[0033] Preferably, the second opening 11 is located on the side wall of the gear housing 1 near the bottom of the reflux chamber 7. The second opening 11 is provided on the side wall of the gear housing 1, and the second opening 11 is located at the bottom of the reflux chamber 7. The second opening 11 is provided at the bottom of the reflux chamber 7 so that the oil at the bottom of the reflux chamber 7 can flow back into the gear housing 1, thereby avoiding the accumulation of oil in the reflux chamber 7.

[0034] Preferably, an oil baffle plate 4 is provided on the inner wall of the gear housing 1 at a position corresponding to the second opening 11, and a gap is provided between the oil baffle plate 4 and the second opening 11. In this embodiment, when the gears in the gear housing 1 rotate at a high speed, oil splashes, and the air pressure in the gear housing 1 also changes. In order to prevent the oil in the gear housing 1 from splashing into the reflux chamber 7 through the second opening 11, an oil baffle plate 4 is provided, and the second opening 11 is shielded by the oil baffle plate 4, so that the splashed oil does not splash into the reflux chamber 7.

[0035] Preferably, the cross section of the oil baffle plate 4 is U-shaped, and its two sides are connected to the inner wall of the gear box body 1 and block the second opening 11. The cross section of the oil baffle plate 4 is U-shaped, and the two sides of the oil baffle plate 4 are welded to the inner wall of the gear box body 1, forming a vertical channel on the inner wall of the gear box body 1, and the second opening 11 is located in the vertical channel between the oil baffle plate 4 and the inner wall of the gear box body 1, so that the oil in the reflux chamber 7 can flow out normally through the second opening 11 while preventing the oil in the gear box body 1 from splashing into the reflux chamber 7.

[0036] Preferably, an oil deflector ring 5 is further included, and the oil deflector ring 5 is arranged at one end of the shaft sleeve 2 located in the gear housing 1. In this embodiment, the oil deflector ring 5 is made of nylon or rubber material, is annular, and is riveted to one end of the shaft sleeve 2 located in the gear housing 1. The oil deflector ring 5 can block the splashing oil in the gear housing 1, reduce the oil in the gear housing 1 from splashing into the gap between the axle and the shaft sleeve 2, and reduce the leakage of oil from the source.

[0037] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above-mentioned technical content without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope of the technical solution of the utility model.

Claims

1. A dynamic seal anti-leakage structure suitable for rail transit bogie gearbox, characterized in that: include: An oil collection structure, comprising a shaft sleeve (2) arranged on the side wall of a gear housing (1), a plurality of sealing ring grooves (21) and at least one oil collecting ring groove (22) being provided on a dynamic sealing surface of the shaft sleeve (2) cooperating with an axle, the oil collecting ring groove (22) being arranged between the plurality of sealing ring grooves (21), and the width of the oil collecting ring groove (22) being greater than the width of the sealing ring groove (21); The oil return structure comprises an oil return flow channel, wherein the oil return flow channel is connected with the bottom of the oil collecting ring groove (22) and the interior of the gear box body (1).

2. The dynamic seal oil leakage prevention structure suitable for rail transit bogie gearbox according to claim 1, characterized in that: A sealing strip (6) for forming a dynamic seal with the axle is arranged in the sealing ring groove (21).

3. The dynamic seal oil leakage prevention structure suitable for rail transit bogie gearbox according to claim 2, characterized in that: The sealing strip (6) comprises a felt strip or a rubber strip.

4. The dynamic seal oil leakage prevention structure suitable for rail transit bogie gearbox according to claim 1, characterized in that: A reflux box (3) is arranged on the outer wall of the gear case (1), the top of the reflux box (3) is connected to the bottom of the shaft sleeve (2), and a reflux chamber (7) is formed between the reflux box (3) and the side wall and shaft sleeve (2) of the gear case (1); a first opening (221) is arranged at the bottom of the oil collecting ring groove (22), and a second opening (11) is arranged on the side wall of the gear case (1), the first opening (221) and the second opening (11) are both connected to the reflux chamber (7), and the first opening (221), the second opening (11) and the reflux chamber (7) together form the oil reflux channel.

5. The dynamic seal oil leakage prevention structure suitable for rail transit bogie gearbox according to claim 4, characterized in that: The second opening (11) is located on the side wall of the gear housing (1) close to the bottom of the reflux chamber (7).

6. The dynamic seal oil leakage prevention structure suitable for rail transit bogie gearbox according to claim 4, characterized in that: An oil baffle plate (4) is provided on the inner wall of the gear housing (1) at a position corresponding to the second opening (11), and a gap is provided between the oil baffle plate (4) and the second opening (11).

7. The dynamic seal oil leakage prevention structure suitable for rail transit bogie gearbox according to claim 6, characterized in that: The cross section of the oil baffle plate (4) is U-shaped, and two sides thereof are connected to the inner wall of the gear box body (1) and shield the second opening (11).

8. The dynamic seal oil leakage prevention structure suitable for rail transit bogie gearbox according to claim 1, characterized in that: It also comprises an oil deflector ring (5), which is arranged at one end of the shaft sleeve (2) located inside the gear box body (1).

Images