Gearbox output shaft sealing mechanism, gearbox and railway vehicle

Abstract

The application relates to the technical field of rail vehicles and provides a gear box output shaft sealing mechanism, a gear box and a rail vehicle. The gear box output shaft sealing mechanism comprises a bearing seat, a shaft end gland and a first oil baffle ring. The bearing seat is fixedly connected to a box body. A bearing is arranged on the inner side of the bearing seat. A bearing sleeve is arranged on the outer side of an output shaft. An oil return groove is arranged on the bearing seat. The shaft end gland is connected to the bearing seat and is arranged on the outer side of the output shaft. The end of the first oil baffle ring, which is away from the output shaft, is provided with at least a first extension part and a second extension part. The first extension part is connected to the bearing seat. The first extension part and the bearing seat form a first oil cavity. The second extension part is connected to the shaft end gland. The second extension part and the shaft end gland and the bearing seat form a second oil cavity. The second oil cavity is communicated with the oil return groove. The side of the second extension part, which is away from the second oil cavity, is further provided with a avoiding cavity. The avoiding cavity is communicated with an oil seal mounting cavity. Thus, the output shaft is prevented from leaking oil.

Description

Technical Field

[0001] This invention relates to the field of rail vehicle technology, and in particular to a gearbox output shaft sealing mechanism, a gearbox, and a rail vehicle. Background Technology

[0002] In rail vehicles, as mileage increases, the wear on seals such as oil seals, dust seals, and oil retaining rings at the output shaft of the gearbox, which originally used light contact seals, increases. This wear makes the output shaft prone to oil leakage, which poses a certain threat to the safety of rail vehicle operation. Summary of the Invention

[0003] The first aspect of the present invention provides a gearbox output shaft sealing mechanism to solve the technical problem of oil leakage at the output shaft in the prior art.

[0004] In a second aspect, the present invention also provides a gearbox.

[0005] In a third aspect, the present invention also provides a rail vehicle.

[0006] This invention provides a gearbox output shaft sealing mechanism, comprising:

[0007] A bearing housing is fixedly connected to the housing. A bearing is provided on the inner side of the bearing housing. The bearing is sleeved on the outer side of the output shaft. An oil return groove is provided on the bearing housing.

[0008] A shaft end cap is connected to the bearing housing and sleeved on the outside of the output shaft;

[0009] The first oil retaining ring is press-fitted onto the outside of the output shaft and has at least a first protrusion and a second protrusion at one end facing away from the output shaft. The first protrusion is connected to the bearing housing, and the first protrusion forms a first oil cavity between the bearing housing and the bearing. The second protrusion is connected to the shaft end cap, and the second protrusion forms a second oil cavity between the shaft end cap and the bearing housing. The second oil cavity communicates with the oil return groove. The side of the second protrusion facing away from the second oil cavity is also provided with a clearance cavity, and the clearance cavity communicates with the oil seal mounting cavity.

[0010] Optionally, the first oil baffle ring includes a main body and a contraction portion connected to the main body;

[0011] The first protruding part and the second protruding part are connected to the contracting part, and the end face of the main body that is away from the contracting part is in contact with the outer end face of the output shaft;

[0012] The first protrusion and the second protrusion are set at an angle and extend in a direction away from the output shaft.

[0013] Optionally, the axial width of the contraction portion along the output shaft is smaller than the axial width of the main body portion along the output shaft;

[0014] A first groove is formed between the contraction portion and the first extension portion and the main body portion, and a second groove is formed between the contraction portion and the second extension portion and the main body portion.

[0015] Optionally, the end face of the first protrusion away from the retractable part abuts against the end face of the bearing seat;

[0016] The end face of the second protrusion that is away from the retractable part is in contact with the end face of the shaft end cap.

[0017] Optionally, it also includes a second oil baffle ring, which is press-fitted onto the outside of the output shaft, with one end of the second oil baffle ring abutting against the first oil baffle ring;

[0018] One end of the shaft end cap is connected to the second oil baffle ring and forms the oil seal mounting cavity between the two oil baffle rings, and an oil seal is placed in the oil seal mounting cavity.

[0019] Optionally, the connection end between the shaft end cap and the second oil baffle ring is provided with at least one set of seals.

[0020] Optionally, the shaft end cap has a receiving groove on the connection end face with the second oil baffle ring, and the shaft end cap and the second oil baffle ring are respectively provided with the sealing element at opposite ends of the receiving groove.

[0021] Optionally, each set of seals includes at least one sealing unit, which is a sealing ring.

[0022] The gearbox provided by the present invention includes: a housing and an output shaft; wherein,

[0023] The housing and the output shaft are sealed together using the gearbox output shaft sealing mechanism described above.

[0024] The rail vehicle provided by the present invention includes the gearbox described above.

[0025] The gearbox output shaft sealing mechanism provided by the present invention has a first oil chamber formed between the first oil retaining ring and the bearing and bearing housing for lubricating the bearing, and a second oil chamber formed between the first oil retaining ring and the bearing housing and shaft end cap for timely discharge of oil immersed in the first oil chamber into the second oil chamber. In addition, a clearance cavity is provided on the side of the second protrusion away from the second oil chamber to further isolate and protect the oil seal and the output shaft, and prevent lubricating oil from seeping into the output shaft.

[0026] The gearbox provided by the present invention includes the gearbox output shaft sealing mechanism described above, and has all the beneficial effects of the gearbox output shaft sealing mechanism. To avoid repetition, it will not be described in detail here.

[0027] The rail vehicle provided by the present invention includes the gearbox described above and has all the beneficial effects of the gearbox, which will not be repeated here to avoid repetition. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the gearbox output shaft sealing mechanism provided by the present invention;

[0030] Figure 2 yes Figure 1 The diagram shows the structure of the first oil baffle ring.

[0031] Figure label:

[0032] 1. Output shaft; 2. Second oil retaining ring; 3. Shaft end cap; 31. Seal; 32. Sealing unit; 33. Receiving groove; 4. First oil retaining ring; 41. First protrusion; 42. Second protrusion; 43. Main body; 44. Retractable part; 45. First groove; 46. Second groove; 5. Housing; 6. Bearing; 7. Bearing seat; 8. Oil return groove; 9. Oil seal; 91. Oil seal mounting cavity; 10. Clearance cavity; 11. First oil cavity; 12. Second oil cavity. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present 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. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0036] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The following is combined with Figures 1 to 2 This embodiment is described.

[0039] Please refer to Figure 1This invention proposes a gearbox output shaft sealing mechanism, including a bearing housing 7, a shaft end cap 3, and a first oil retaining ring 4. The bearing housing 7 is fixedly connected to the housing 5, and a bearing 6 is provided inside the bearing housing 7. The bearing 6 is sleeved on the outside of the output shaft 1, and an oil return groove 8 is provided on the bearing housing 7. The shaft end cap 3 is connected to the bearing housing 7 and sleeved on the outside of the output shaft 1. The first oil retaining ring 4 is pressed onto the outside of the output shaft 1, and at least one end facing away from the output shaft 1 has a first protrusion 41 and a second protrusion 42. The first protrusion 41 is connected to the bearing housing 7, and forms a first oil cavity 11 between the first protrusion 41 and the bearing housing 7 and the bearing 6 respectively. The second protrusion 42 is connected to the shaft end cap 3, and forms a second oil cavity 12 between the second protrusion 42 and the shaft end cap 3 and the bearing housing 7 respectively. The second oil cavity 12 communicates with the oil return groove 8. A clearance cavity 10 is also provided on the side of the second protrusion 42 facing away from the second oil cavity 12, and the clearance cavity 10 communicates with the oil seal mounting cavity 91.

[0040] In one embodiment, the bearing housing 7 and the housing 5 can be connected by a threaded fastener, such as a bolt, but this is not a limitation. The oil return groove 8 is used to discharge the oil that has seeped into the second oil chamber 12 from the first oil chamber 11 in a timely manner, preventing the lubricating oil from seeping into the clearance chamber 10 and reaching the output shaft 1, which would cause oil leakage at the output shaft 1. The oil return groove 8 can be set at an axial angle relative to the output shaft 1, which is beneficial for the lubricating oil to flow out through the oil return groove 8 during the rotation of the output shaft 1.

[0041] In one embodiment, the first oil baffle ring 4 can initially isolate the lubricating oil on the bearing 6 side, allowing the lubricating oil in the first oil groove to lubricate the bearing 6. During the long-term operation of the rail vehicle, the oil baffle ring will inevitably rub against the bearing housing 7, resulting in a small amount of lubricating oil entering the second oil chamber 12. However, the second oil chamber 12 is directly connected to the return oil groove 8, which allows for timely discharge and prevents further seepage of lubricating oil towards the output shaft 1. At the same time, the contact between the first oil baffle ring 4 and the shaft end cap 3 also prevents lubricating oil from seeping towards the output shaft 1.

[0042] In one embodiment, the first oil baffle ring 4 includes a main body 43 and a constricted portion 44 connected to the main body 43. A first protruding portion 41 and a second protruding portion 42 are connected to the constricted portion 44, and one end face of the main body 43 facing away from the constricted portion 44 is in contact with the outer end face of the output shaft 1; the first protruding portion 41 and the second protruding portion 42 are set at an angle and extend in a direction away from the output shaft 1.

[0043] Specifically, the axial width of the contraction portion 44 along the output shaft 1 is smaller than the axial width of the main body portion 43 along the output shaft 1. A first groove 45 is formed between the contraction portion 44, the first extension portion 41, and the main body portion 43. A second groove 46 is formed between the contraction portion 44, the second extension portion 42, and the main body portion 43.

[0044] With this configuration, the shrinkage section 44 can form a relatively large accommodating space between the bearing 6 and the shaft end cap 3 within a limited space, which correspondingly increases the space of the first oil chamber 11 and the clearance chamber 10. With the increased space, more lubricating oil can be accommodated, resulting in better protection.

[0045] The angle between the first extension 41 and the second extension 42 is set so that during the rotation of the output shaft 1, under the action of centrifugal force, the clearance cavity 10 forms a low-pressure zone relative to the second oil cavity 12. Thus, under the action of pressure difference, a thrust is generated on the oil that seeps into the second oil cavity 12 toward the clearance cavity 10, preventing the lubricating oil from flowing into the clearance cavity 10.

[0046] In one embodiment, the end face of the first protrusion 41 facing away from the contraction portion 44 abuts against the end face of the bearing housing 7; the end face of the second protrusion 42 facing away from the contraction portion 44 fits against the end face of the shaft end cap 3. Specifically, the mating surface between the first protrusion 41 and the bearing housing 7 is perpendicular to the mating surface between the second protrusion 42 and the shaft end cap 3.

[0047] The mating surface between the first protrusion 41 and the bearing housing 7 is an axial surface, which can be specifically determined according to... Figure 1 At point A, during the rotation of the output shaft 1, the mating surface between the first protrusion 41 and the bearing housing 7 will wear due to vibration or uneven rotation speed. The mating surface between the second protrusion 42 and the shaft end cap 3 is a radial surface, as detailed in [reference needed]. Figure 1 At point B, the rotation of the output shaft 1 has very little effect, thus achieving a better sealing effect. Setting the sealing structure at a location with weak pressure difference and rotational wear, namely the seal between the second protrusion 42 and the shaft end cap 3, can maximize the isolation of the flow path of lubricating oil from the second oil chamber 12 side toward the clearance chamber 10.

[0048] In one embodiment, the gearbox output shaft sealing mechanism further includes a second oil baffle ring 2, which is press-fitted onto the outside of the output shaft 1, with one end of the second oil baffle ring 2 abutting against the first oil baffle ring 4; one end of the shaft end cap 3 is connected to the second oil baffle ring 2 and forms an oil seal mounting cavity 91 between them, with an oil seal 9 placed inside the oil seal mounting cavity 91.

[0049] The oil seal mounting cavity 91 is connected to the clearance cavity 10. Under the action of the first oil retaining ring 4, the lubricating oil is isolated into the second oil cavity 12, thus preventing the lubricating oil from seeping into the output shaft 1 side.

[0050] The embodiment of this application further provides a first oil baffle ring 4 on the basis of the second oil baffle ring 2, which improves the sealing effect of the gearbox. Moreover, when the first oil baffle ring 4 is disassembled and installed, there is no need to replace or disassemble other parts, making disassembly and installation convenient and maintenance easy.

[0051] In one embodiment, the connection end between the shaft end cap 3 and the second oil baffle ring 2 is provided with at least one set of seals 31. The seals 31 can prevent dust, moisture and other debris from entering the bearing 6 through the installation gap between the shaft end cap 3 and the second oil baffle ring 2 and reaching the output shaft 1 side, thus affecting the output shaft 1.

[0052] Specifically, the shaft end cap 3 has a receiving groove 33 on the connecting end face with the second oil baffle ring 2, and the shaft end cap 3 and the second oil baffle ring 2 are respectively provided with sealing elements 31 at opposite ends of the receiving groove 33.

[0053] The trough 33 can collect dust or moisture, and the double seal on both sides of the trough 33 provides a better sealing effect.

[0054] In one embodiment, each set of seals 31 includes at least one sealing unit 32, which is a sealing ring.

[0055] The receiving groove 33 can be provided with a sealing ring on each of its opposite sides, or two sealing rings can be provided on the side away from the shaft seal and one sealing ring can be provided on the side close to the shaft seal, thus providing double or even multi-layer protection.

[0056] The present invention also provides a gearbox, including a housing 5 and an output shaft 1, wherein the housing 5 and the output shaft 1 are fitted together by the aforementioned gearbox output shaft sealing mechanism. Because the housing 5 and the output shaft 1 are fitted together by the aforementioned gearbox output shaft sealing mechanism, the sealing effect is better.

[0057] The present invention also provides a rail vehicle including the gearbox described above. Since the rail vehicle has the gearbox described above, it possesses all the advantages of the gearbox described above, which will not be elaborated upon here.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gearbox output shaft sealing mechanism, characterized in that, include: A bearing housing is fixedly connected to the housing. A bearing is provided on the inner side of the bearing housing. The bearing is sleeved on the outer side of the output shaft. An oil return groove is provided on the bearing housing. A shaft end cap is connected to the bearing housing and sleeved on the outside of the output shaft; The first oil retaining ring is press-fitted onto the outside of the output shaft, and at least has a first protrusion and a second protrusion at one end facing away from the output shaft. The first protrusion is connected to the bearing housing, and forms a first oil cavity between the first protrusion and the bearing housing and the bearing, respectively. The second protrusion is connected to the shaft end cap, and forms a second oil cavity between the second protrusion and the shaft end cap and the bearing housing, respectively. The second oil cavity communicates with the oil return groove. A clearance cavity is also provided on the side of the second protrusion facing away from the second oil cavity, and the clearance cavity communicates with the oil seal mounting cavity. The first oil baffle ring includes a main body and a contraction portion connected to the main body; The first protruding part and the second protruding part are connected to the contracting part, and the end face of the main body that is away from the contracting part is in contact with the outer end face of the output shaft; The first protrusion and the second protrusion are set at an angle and extend in a direction away from the output shaft; A first groove is formed between the contraction portion and the first extension portion and the main body portion, and a second groove is formed between the contraction portion and the second extension portion and the main body portion; The end face of the first protruding part away from the retractable part abuts against the end face of the bearing seat; The end face of the second protrusion that is away from the retractable part is in contact with the end face of the shaft end cap.

2. The gearbox output shaft sealing mechanism according to claim 1, characterized in that, The axial width of the contraction portion along the output shaft is smaller than the axial width of the main body portion along the output shaft.

3. The gearbox output shaft sealing mechanism according to claim 1, characterized in that, It also includes a second oil baffle ring, which is press-fitted onto the outside of the output shaft, with one end of the second oil baffle ring abutting against the first oil baffle ring; One end of the shaft end cap is connected to the second oil baffle ring and forms the oil seal mounting cavity between the two oil baffle rings, and an oil seal is placed in the oil seal mounting cavity.

4. The gearbox output shaft sealing mechanism according to claim 3, characterized in that, The connection end between the shaft end cap and the second oil baffle ring is provided with at least one set of seals.

5. The gearbox output shaft sealing mechanism according to claim 4, characterized in that, The shaft end cap has a receiving groove on the connection end face with the second oil baffle ring, and the shaft end cap and the second oil baffle ring are respectively provided with the sealing element at opposite ends of the receiving groove.

6. The gearbox output shaft sealing mechanism according to claim 4, characterized in that, Each set of seals includes at least one sealing unit, which is a sealing ring.

7. A gearbox, characterized in that, include: Housing and output shaft; among which, The housing and the output shaft are sealed together by a gearbox output shaft sealing mechanism as described in any one of claims 1-6.

8. A rail vehicle, characterized in that, include: The gearbox as described in claim 7.

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