Sealing structure and gearbox

Abstract

The invention relates to the technical field of gear boxes, and particularly discloses a sealing structure and a gear box. The sealing structure comprises a fixed component, a rotating component and a sealing assembly. The fixing component is provided with a first connecting part, and the first connecting part is provided with a first oil way; the rotating component is provided with a second connecting part, and the second connecting part is provided with a second oil way; the sealing assembly comprises a first sealing ring, a second sealing ring and a pressing ring located between the first sealing ring and the second sealing ring. Along the axial direction, the pressing ring provides axial support for the first sealing ring and the second sealing ring. In the radial direction, the first sealing ring and the second sealing ring abut against the second connecting part and are arranged at intervals with the first connecting part. Or the first sealing ring and the second sealing ring abut against the first connecting part, and the first sealing ring and the second sealing ring are arranged at intervals with the second connecting part. According to the sealing structure, the rotating component can be allowed to have large eccentricity relative to the fixed component, meanwhile, the leakage amount of lubricating oil can be reduced, and effective transmission of the lubricating oil is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of gear boxes, and in particular to a sealing structure and a gear box. Background Art

[0002] Gearbox is a basic transmission device, widely used in various mechanical equipment, mainly used to transmit and convert power. In the planetary gear structure, the planetary gear bearings and sun gear meshing both require lubricating oil, which is generally injected from the box and enters the planet carrier through the internal channel.

[0003] In the prior art, a slip ring is provided between the housing and the planetary carrier. The slip ring is sleeved on the inner wall of the housing or the planetary carrier. A small gap is provided between the outer circumference of the slip ring and the planetary carrier or the housing. When the eccentricity of the axis between the housing and the planetary carrier is small, the slip ring can be designed with a smaller gap to realize the transmission of pressurized lubricating oil from stationary parts to rotating parts while allowing appropriate leakage of lubricating oil. However, when the planetary carrier has a large eccentricity relative to the housing, for example, an eccentricity of more than 1 mm, a larger gap needs to be designed between the slip ring and the planetary carrier to avoid interference between the two, which results in a large leakage of lubricating oil and cannot ensure the effective transmission of lubricating oil. Summary of the invention

[0004] The object of the present invention is to provide a sealing structure and a gear box, which can allow a planet carrier to have a larger eccentricity relative to the box body, and at the same time can reduce the leakage of lubricating oil and ensure the effective transmission of lubricating oil.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a sealing structure, comprising:

[0007] A fixing member, the fixing member having a first connecting portion, the first connecting portion being provided with a first oil passage;

[0008] A rotating member, wherein the rotating member has a second connecting portion, the second connecting portion is plugged into the first connecting portion, and the second connecting portion is provided with a second oil passage;

[0009] a sealing assembly, sleeved between the first connecting portion and the second connecting portion, the sealing assembly comprising a first sealing ring, a second sealing ring and a pressure ring located between the first sealing ring and the second sealing ring, the pressure ring being provided with a third oil circuit, and two ends of the third oil circuit being respectively connected to the first oil circuit and the second oil circuit;

[0010] In the axial direction, the pressure ring provides axial support to the first sealing ring and the second sealing ring;

[0011] In radial direction, both the first sealing ring and the second sealing ring abut against the second connecting portion and are spaced apart from the first connecting portion, or both the first sealing ring and the second sealing ring abut against the first connecting portion and are spaced apart from the second connecting portion.

[0012] As an optional solution of the above sealing structure, the sealing assembly further includes an elastic member, wherein the elastic member elastically abuts between the first sealing ring and the pressure ring, and / or the elastic member elastically abuts between the second sealing ring and the pressure ring.

[0013] As an optional solution of the above sealing structure, the first sealing ring and / or the second sealing ring and / or the pressure ring are provided with a limiting groove, and part of the elastic member is embedded in the limiting groove.

[0014] As an optional scheme of the above-mentioned sealing structure, the first sealing ring is provided with a first protrusion protruding from one side toward the second sealing ring, the second sealing ring is provided with a second protrusion protruding from one side toward the first sealing ring, and one side of the pressure ring along the radial direction abuts against the first protrusion and the second protrusion.

[0015] As an optional solution of the above sealing structure, the first protrusion and the second protrusion are both located between the pressure ring and the first connecting portion.

[0016] As an optional solution of the above sealing structure, one of the first connecting part and the second connecting part is provided with a mounting groove, and the first sealing ring, the second sealing ring and the pressure ring are all arranged in the mounting groove.

[0017] As an optional scheme of the above-mentioned sealing structure, when the first connecting part opens the installation groove, the first connecting part is detachably connected with a pressure plate, and the first connecting part and the pressure plate together form the installation groove; when the second connecting part opens the installation groove, the second connecting part is detachably connected with a pressure plate, and the second connecting part and the pressure plate together form the installation groove.

[0018] As an optional solution of the above sealing structure, the sealing structure further includes a connecting piece, the pressure plate is provided with a pre-buried groove, and the connecting piece is connected to the first connecting part or the second connecting part via the pre-buried groove.

[0019] As an optional solution of the above sealing structure, a plurality of the second oil circuits and a plurality of the third oil circuits are provided, wherein the plurality of the second oil circuits are arranged at intervals along the circumference of the rotating member, and the plurality of the third oil circuits are arranged at intervals along the circumference of the pressure ring.

[0020] On the other hand, the present invention provides a gear box, including the sealing structure as described above, wherein the fixed component is a box body, and the rotating component is a planet carrier.

[0021] The beneficial effects of the present invention are:

[0022] The sealing structure includes a fixed component, a rotating component and a sealing assembly. The fixed component has a first connection part, the first connection part is provided with a first oil circuit, the rotating component has a second connection part, the second connection part is plugged with the first connection part, and the second connection part is provided with a second oil circuit, the sealing assembly is sleeved between the first connection part and the second connection part, and the sealing assembly includes a first sealing ring, a second sealing ring and a pressure ring located between the first sealing ring and the second sealing ring, the pressure ring is provided with a third oil circuit, and the two ends of the third oil circuit are respectively connected to the first oil circuit and the second oil circuit, so that the lubricating oil in the first oil circuit can enter the second oil circuit via the third oil circuit.

[0023] Wherein, in the axial direction, the pressure ring provides axial support to the first sealing ring and the second sealing ring, so that the first sealing ring and the second sealing ring can abut against the first connection part, or abut against the second connection part, so as to form a seal to prevent the leakage of lubricating oil. In the radial direction, the first sealing ring and the second sealing ring are both abutted against the second connection part and are spaced from the first connection part, so that when the rotating component is eccentric relative to the fixed component, the first sealing ring and the second sealing ring can follow the movement, at this time, the gap between the first sealing ring and the second connection part and between the second sealing ring and the second connection part is small, and the first sealing ring and the second sealing ring will not interfere with the fixed component; or, the first sealing ring and the second sealing ring are both abutted against the first connection part and are spaced from the second connection part, so that when the rotating component is eccentric relative to the fixed component, the position of the first sealing ring and the second sealing ring relative to the fixed component remains unchanged, at this time, the gap between the first sealing ring and the first connection part and between the second sealing ring and the first connection part is small, and the first sealing ring and the second sealing ring will not interfere with the rotating component. This sealing structure can allow the rotating component to have a large eccentricity relative to the fixed component, and at the same time, it can also reduce the leakage of lubricating oil and ensure the effective transmission of lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A cross-sectional view of a sealing structure provided by an embodiment of the present invention;

[0025] Figure 2 A first partial cross-sectional view of a sealing structure provided by an embodiment of the present invention;

[0026] Figure 3 A second partial cross-sectional view of the sealing structure provided by an embodiment of the present invention;

[0027] Figure 4A first partial cross-sectional view of another sealing structure provided by an embodiment of the present invention;

[0028] Figure 5 A second partial cross-sectional view of another sealing structure provided by an embodiment of the present invention.

[0029] In the figure:

[0030] 1. Fixed component; 11. First connecting part; 111. First oil circuit; 2. Rotating component; 21. Second connecting part; 211. Second oil circuit; 3. Sealing assembly; 31. First sealing ring; 311. First protrusion; 32. Second sealing ring; 321. Second protrusion; 33. Pressing ring; 331. Third oil circuit; 34. Elastic member; 35. Limiting groove; 4. Mounting groove; 5. Pressing plate; 51. Embedded groove; 6. Connecting member. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] like Figure 1 to Figure 5 As shown, this embodiment provides a sealing structure, which includes a fixed component 1, a rotating component 2 and a sealing assembly 3.

[0036] The fixed component 1 has a first connection part 11, and the first connection part 11 is provided with a first oil circuit 111. The rotating component 2 has a second connection part 21, which is plugged into the first connection part 11 and provided with a second oil circuit 211. The sealing assembly 3 is sleeved between the first connection part 11 and the second connection part 21. At the same time, the sealing assembly 3 includes a first sealing ring 31, a second sealing ring 32 and a pressure ring 33 located between the first sealing ring 31 and the second sealing ring 32. The pressure ring 33 is provided with a third oil circuit 331. The two ends of the third oil circuit 331 are respectively connected to the first oil circuit 111 and the second oil circuit 211, so that the lubricating oil in the first oil circuit 111 can enter the second oil circuit 211 via the third oil circuit 331. Optionally, a plurality of second oil circuits 211 and a plurality of third oil circuits 331 are provided, wherein the plurality of second oil circuits 211 are provided at intervals along the circumference of the rotating member 2, and the plurality of third oil circuits 331 are provided at intervals along the circumference of the pressure ring 33. Thus, by providing the plurality of second oil circuits 211 and the third oil circuits 331, the lubricating oil delivery efficiency can be improved.

[0037] Among them, along the axial direction, the pressure ring 33 provides axial support to the first sealing ring 31 and the second sealing ring 32, so that the first sealing ring 31 and the second sealing ring 32 can abut against the first connecting part 11 or the second connecting part 21, thereby forming a seal to prevent leakage of lubricating oil. In the radial direction, the first sealing ring 31 and the second sealing ring 32 are both in contact with the second connecting portion 21 and are spaced apart from the first connecting portion 11, so that when the rotating component 2 is eccentric relative to the fixed component 1, the first sealing ring 31 and the second sealing ring 32 can follow the movement, at this time, the gaps between the first sealing ring 31 and the second connecting portion 21 and between the second sealing ring 32 and the second connecting portion 21 are small, and the first sealing ring 31 and the second sealing ring 32 will not interfere with the fixed component 1; or, the first sealing ring 31 and the second sealing ring 32 are both in contact with the first connecting portion 11 and are spaced apart from the second connecting portion 21, so that when the rotating component 2 is eccentric relative to the fixed component 1, the positions of the first sealing ring 31 and the second sealing ring 32 relative to the fixed component 1 remain unchanged, at this time, the gaps between the first sealing ring 31 and the first connecting portion 11 and between the second sealing ring 32 and the first connecting portion 11 are small, and the first sealing ring 31 and the second sealing ring 32 will not interfere with the rotating component 2.

[0038] The sealing structure can allow the rotating member 2 to have a large eccentricity relative to the fixed member 1, and can also reduce the leakage of lubricating oil, thereby ensuring the effective transmission of lubricating oil. Optionally, the first sealing ring 31 and the second sealing ring 32 are both nylon rings, polytetrafluoroethylene rings, or metal rings, so that the first sealing ring 31 and the second sealing ring 32 can have a certain wear resistance while having a sealing effect, so as to prevent a large amount of lubricating oil leakage caused by wear.

[0039] like Figure 3 and Figure 5As shown, the sealing assembly 3 also includes an elastic member 34, and the elastic member 34 elastically abuts between the first sealing ring 31 and the pressure ring 33, and / or the elastic member 34 elastically abuts between the second sealing ring 32 and the pressure ring 33, so that through the setting of the elastic member 34, the first sealing ring 31 and the second sealing ring 32 can always be sealed against the first connecting portion 11 or the second connecting portion 21, so as to prevent the first sealing ring 31 and the second sealing ring 32 from having a large gap between the axial outer side and the first connecting portion 11, or between the first sealing ring 31 and the second sealing ring 32 and the second connecting portion 21 due to installation error or processing error or eccentricity of the rotating component 2 relative to the fixed component 1, thereby avoiding a large amount of leakage of lubricating oil. Optionally, the first sealing ring 31 and / or the second sealing ring 32 and / or the pressure ring 33 are provided with a limiting groove 35, and part of the elastic member 34 is embedded in the limiting groove 35, so that the limiting groove 35 can limit the elastic member 34, and prevent the elastic member 34 from being dislocated and causing the first sealing ring 31 and the second sealing ring 32 to fail. Further optionally, a plurality of elastic members 34 are provided, thereby being able to improve the elastic abutment capability.

[0040] like Figure 2 to Figure 5 As shown, the first sealing ring 31 is provided with a first protrusion 311 protruding from one side of the second sealing ring 32, and the second sealing ring 32 is provided with a second protrusion 321 protruding from one side of the first sealing ring 31. One side of the pressure ring 33 along the radial direction abuts against the first protrusion 311 and the second protrusion 321, so that the first sealing ring 31 and the second sealing ring 32 are limited in the radial direction by the pressure ring 33 to prevent the first sealing ring 31 and the second sealing ring 32 from expanding in size after the temperature rises and causing unnecessary wear.

[0041] Among them, the first protrusion 311 and the second protrusion 321 are both located between the pressure ring 33 and the first connecting part 11. When the first sealing ring 31 and the second sealing ring 32 are both in contact with the second connecting part 21 and are spaced apart from the first connecting part 11, the pressure ring 33 can limit the first protrusion 311 and the second protrusion 321 to prevent the first sealing ring 31 and the second sealing ring 32 from expanding too much when the temperature rises, thereby reducing the wear of the first sealing ring 31 and the second sealing ring 32, preventing a large amount of lubricating oil leakage caused by wear, and at the same time extending the service life of the sealing structure; when the first sealing ring 31 and the second sealing ring 32 are both in contact with the first connecting part 11 and are spaced apart from the second connecting part 21, the pressure ring 33 can limit the first protrusion 311 and the second protrusion 321 to prevent the first sealing ring 31 and the second sealing ring 32 from expanding too much when the temperature rises, causing a large gap with the first connecting part 11, and preventing a large amount of lubricating oil leakage caused by the large gap.

[0042] Specifically, one of the first connection part 11 and the second connection part 21 is provided with a mounting groove 4, and the first sealing ring 31, the second sealing ring 32 and the pressure ring 33 are all provided in the mounting groove 4, and the pressure ring 33 can press the first sealing ring 31 and the second sealing ring 32 to the groove wall of the mounting groove 4 in the axial direction, so that the first sealing ring 31 and the second sealing ring 32 can form a seal with the groove wall of the mounting groove 4. When the first connection part 11 is provided with the mounting groove 4, one end of the first sealing ring 31 and the second sealing ring 32 in the radial direction abuts against the second connection part 21, and the other end of the first sealing ring 31 and the second sealing ring 32 in the radial direction is spaced from the groove bottom of the mounting groove 4; when the second connection part 21 is provided with the mounting groove 4, one end of the first sealing ring 31 and the second sealing ring 32 in the radial direction abuts against the first connection part 11, and the other end of the first sealing ring 31 and the second sealing ring 32 in the radial direction is spaced from the groove bottom of the mounting groove 4.

[0043] Further, when the first connection part 11 is provided with the installation groove 4, the first connection part 11 is detachably connected with the pressing plate 5, and the first connection part 11 and the pressing plate 5 are enclosed to form the installation groove 4, and when the second connection part 21 is provided with the installation groove 4, the second connection part 21 is detachably connected with the pressing plate 5, and the second connection part 21 and the pressing plate 5 are enclosed to form the installation groove 4, so that the installation or replacement of the sealing assembly 3 in the installation groove 4 can be facilitated by the arrangement of the pressing plate 5. Specifically, the sealing structure also includes a connecting member 6, and the pressing plate 5 is provided with an embedded groove 51, and the connecting member 6 is connected to the first connection part 11 or the second connection part 21 via the embedded groove 51, so that the connecting member 6 can be embedded through the embedded groove 51 to prevent the connecting member 6 from protruding from the pressing plate 5 and affecting the internal structure of the gear box.

[0044] This embodiment also provides a gearbox, including the sealing structure as described above, wherein the fixed component 1 is a housing, and the rotating component 2 is a planetary carrier. Thus, by using the sealing structure as described above, the gearbox can allow the planetary carrier to have a larger eccentricity relative to the housing, while also reducing the leakage of lubricating oil and ensuring the effective transmission of lubricating oil.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A sealing structure, characterized in that: include: A fixing member (1), the fixing member (1) having a first connecting portion (11), the first connecting portion (11) being provided with a first oil passage (111); A rotating member (2), the rotating member (2) having a second connecting portion (21), the second connecting portion (21) being plugged into the first connecting portion (11), and the second connecting portion (21) being provided with a second oil passage (211); A sealing assembly (3) is sleeved between the first connecting portion (11) and the second connecting portion (21), the sealing assembly (3) comprising a first sealing ring (31), a second sealing ring (32) and a pressure ring (33) located between the first sealing ring (31) and the second sealing ring (32), the pressure ring (33) being provided with a third oil passage (331), and two ends of the third oil passage (331) being respectively connected to the first oil passage (111) and the second oil passage (211); In the axial direction, the pressure ring (33) provides axial support to the first sealing ring (31) and the second sealing ring (32); In the radial direction, the first sealing ring (31) and the second sealing ring (32) are both in contact with the second connecting portion (21) and are spaced apart from the first connecting portion (11); or the first sealing ring (31) and the second sealing ring (32) are both in contact with the first connecting portion (11) and are spaced apart from the second connecting portion (21).

2. The sealing structure according to claim 1, characterized in that: The sealing assembly (3) further comprises an elastic member (34), wherein the elastic member (34) elastically abuts between the first sealing ring (31) and the pressure ring (33), and / or the elastic member (34) elastically abuts between the second sealing ring (32) and the pressure ring (33).

3. The sealing structure according to claim 2, characterized in that: The first sealing ring (31) and / or the second sealing ring (32) and / or the pressure ring (33) are provided with a limiting groove (35), and part of the elastic member (34) is embedded in the limiting groove (35).

4. The sealing structure according to claim 1, characterized in that: The first sealing ring (31) is provided with a first protrusion (311) protruding toward one side of the second sealing ring (32), and the second sealing ring (32) is provided with a second protrusion (321) protruding toward one side of the first sealing ring (31), and one side of the pressure ring (33) along the radial direction abuts against the first protrusion (311) and the second protrusion (321).

5. The sealing structure according to claim 4, characterized in that: The first protruding portion (311) and the second protruding portion (321) are both located between the pressure ring (33) and the first connecting portion (11).

6. The sealing structure according to claim 1, characterized in that: One of the first connecting portion (11) and the second connecting portion (21) is provided with a mounting groove (4), and the first sealing ring (31), the second sealing ring (32) and the pressure ring (33) are all arranged in the mounting groove (4).

7. The sealing structure according to claim 6, characterized in that: When the first connection part (11) opens the installation groove (4), the first connection part (11) is detachably connected to a pressure plate (5), and the first connection part (11) and the pressure plate (5) together form the installation groove (4); when the second connection part (21) opens the installation groove (4), the second connection part (21) is detachably connected to a pressure plate (5), and the second connection part (21) and the pressure plate (5) together form the installation groove (4).

8. The sealing structure according to claim 7, characterized in that: The sealing structure further comprises a connecting piece (6), the pressing plate (5) is provided with a pre-buried groove (51), and the connecting piece (6) is connected to the first connecting portion (11) or the second connecting portion (21) via the pre-buried groove (51).

9. The sealing structure according to any one of claims 1 to 8, characterized in that: A plurality of the second oil passages (211) and the third oil passages (331) are provided. The plurality of the second oil passages (211) are arranged at intervals along the circumference of the rotating component (2), and the plurality of the third oil passages (331) are arranged at intervals along the circumference of the pressure ring (33).

10. A gear box, characterized in that: It comprises a sealing structure as claimed in any one of claims 1 to 9, wherein the fixed component (1) is a box body, and the rotating component (2) is a planet carrier.

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