Sealing device for output shaft of split speed reducer

Abstract

The utility model relates to the technical field of sealing of output shafts of speed reducers, in particular to a sealing device for an output shaft of a split speed reducer, which comprises a speed reducer body, the speed reducer body further comprises an output end and is fixedly connected with a first cover plate, and one end, provided with the output end, of the speed reducer body is fixedly connected with two fixing bolts. When the second cover plate is installed, the annular extrusion part extrudes the metal extrusion part, the metal extrusion part extrudes the second oil seal, the second oil seal extrudes the output end, the sealing performance of the second oil seal is improved, the second oil seal in the oil seal assembly plays a second-layer sealing role after the first oil seal in the first cover plate fails, oil leakage is prevented, and the service life of the oil seal assembly is prolonged. And the second oil seal is extruded by the metal extrusion piece, so that the inner ring of the second oil seal is in closer contact with the output end, the overall sealing performance of the second oil seal is greatly improved, the second oil seal is not provided with an opening, the sealing performance is guaranteed, and the problem that the opening of the second oil seal of an existing device possibly leaks oil is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of the output shaft sealing of a speed reducer, and particularly relates to a sealing device for a split speed reducer output shaft. Background Art

[0002] Generally, a skeleton oil seal is used to seal the input / output shaft of a speed reducer. The skeleton oil seal is installed in an end cover, and its inner hole is in contact with the input / output shaft (collectively referred to as the rotating shaft below), achieving a sealing effect. However, the rotation of the rotating shaft will wear the oil seal, and oil leakage is likely to occur after long-term use.

[0003] Currently, the existing split sealing device for a speed reducer (such as patent number: CN214367655U) discloses a split sealing device for a speed reducer, including a first end cover installed on a body and a first oil seal located inside the first end cover. The rotating shaft passes through the first end cover and the first oil seal, and the inner hole of the first oil seal is in contact with the rotating shaft. The sealing device further includes a second end cover and a second oil seal. The second end cover is installed outside the first end cover, and its inner end face is in contact with the outer end face of the first end cover. An annular groove is further provided on the inner end face of the second end cover. The second oil seal is matched with the annular groove and its inner hole is in contact with the rotating shaft; the second end cover is of a split structure and is composed of two or more arc-shaped parts distributed circumferentially around the rotating shaft. The utility model not only improves the sealing effect, but also does not require the disassembly of the original first end cover and the shafting when replacing the second oil seal, with simple operation and short time consumption.

[0004] However, during the implementation of the above technical solution, it is found that there are at least the following technical problems: Although the existing device is provided with two layers of oil seals, and there is still the second oil seal for sealing when the first oil seal leaks, the second oil seal of the existing device is of an open structure. Although most positions of the second oil seal can play a sealing role, because it is of an open structure, there will still be some leakage at its opening. Therefore, there is still room for improvement in the sealing of the existing device. Summary of the Utility Model

[0005] (I) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the utility model provides a sealing device for a split speed reducer output shaft, solving the technical problem that oil may leak at the opening of the second oil seal of the existing device.

[0007] (II) Technical Solutions

[0008] To achieve the above purposes, the utility model is realized through the following technical solutions:

[0009] A sealing device for the output shaft of a split-type speed reducer, including a speed reducer body, the speed reducer body further includes an output end, one end of the speed reducer body provided with the output end is fixedly connected with a first cover plate, a first oil seal is arranged in the first cover plate, two fixing bolts are fixedly connected to one end of the speed reducer body provided with the output end, an annular embedding groove is opened on the side of the first cover plate away from the speed reducer body, an oil seal assembly is arranged on the side of the first cover plate away from the speed reducer body, a protection mechanism is arranged on the side of the oil seal assembly away from the first cover plate, the protection mechanism is docked with the fixing bolts, and the protection mechanism is in extrusion connection with the oil seal assembly. The oil seal assembly includes a second oil seal and a metal extrusion part. The second oil seal is made of rubber, and the protection mechanism includes a second cover plate.

[0010] Preferably: One side of the second oil seal close to the first cover plate is fixedly connected with an annular embedding part, and the annular embedding part is embedded in the annular embedding groove.

[0011] Preferably: An extrusion groove is opened on the outer wall of the second oil seal.

[0012] Preferably: The metal extrusion part is arranged in the extrusion groove. The metal extrusion part is split-type and consists of two U-shaped rings. The metal extrusion part is annular as a whole, and an upward inclined surface is arranged on the side of the metal extrusion part away from the second oil seal.

[0013] Preferably: An annular extrusion part is fixedly connected to the inner wall of the second cover plate. The annular extrusion part is annular, and a downward inclined surface is arranged on the annular extrusion part.

[0014] Preferably: The annular extrusion part is in extrusion connection with the metal extrusion part. The upward inclined surface arranged on the metal extrusion part and the downward inclined surface arranged on the annular extrusion part are mutually extruded, so that the metal extrusion part is in interference fit with the extrusion groove opened on the second oil seal.

[0015] Preferably: The second cover plate surrounds the first cover plate and the oil seal assembly as a whole.

[0016] Preferably: Two fixing plates are fixedly connected to the outer wall of the second cover plate. Through holes are opened in both fixing plates. The two fixing plates are respectively docked with the two fixing bolts, and a hexagonal nut is threadedly connected to one end of the fixing bolt passing through the fixing plate.

[0017] (III) Beneficial effects

[0018] 1. When installing the second cover plate, the annular extrusion part will extrude the metal extrusion part, causing the metal extrusion part to extrude towards the second oil seal and making the second oil seal extrude the output end, increasing the sealing performance of the second oil seal. The second oil seal in the oil seal assembly plays a secondary sealing role after the first oil seal in the first cover plate fails, preventing oil leakage. Moreover, the second oil seal is extruded by the metal extrusion part, making the contact between the inner ring of the second oil seal and the output end closer, greatly improving the overall sealing performance of the second oil seal. And the second oil seal is annular without an opening, ensuring the sealing performance and solving the problem of possible oil leakage at the opening of the second oil seal of the existing device.

[0019] 2. The second cover plate surrounds the first cover plate, the second oil seal and the metal extrusion part as a whole, greatly increasing the protection performance. It not only protects the oil seal assembly but also protects the first cover plate and the first oil seal inside it. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly and implement it in accordance with the content of the description, the following describes in detail with reference to the preferred embodiments of the present utility model and the accompanying drawings.

[0021] Figure 1 Side view structure diagram of the whole device of the present utility model;

[0022] Figure 2 Separation state structure diagram of the whole device of the present utility model;

[0023] Figure 3 Separation state structure diagram of the oil seal assembly of the present utility model;

[0024] Figure 4 Cross-sectional structure diagram of the protection mechanism of the present utility model;

[0025] Figure 5 Cross-sectional structure diagram of the second oil seal of the present utility model;

[0026] Figure 6 For the present utility model Figure 4 Enlarged structure diagram at position A.

[0027] Legend: 1. Reducer body; 2. First cover plate; 3. Second oil seal; 4. Metal extrusion part; 5. Second cover plate; 6. Hexagonal nut; 101. Fixed bolt; 102. Output end; 201. Annular embedding groove; 301. Extrusion groove; 302. Annular embedding part; 501. Fixed plate; 502. Annular extrusion part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] By providing a split-type sealing device for the output shaft of a reducer in the embodiments of the present application, the problem of possible oil leakage at the opening of the second oil seal of the existing device is effectively solved.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the technical solution in the embodiment of the present application effectively solves the technical problem that the second oil seal opening of the existing device may leak oil. The overall idea is as follows:

[0030] In view of the problems existing in the prior art, the utility model provides a sealing device for the output shaft of a split reducer, including a reducer body 1, the reducer body 1 also including an output end 102, one end of the reducer body 1 provided with the output end 102 is fixedly connected to a first cover plate 2, a first oil seal is arranged in the first cover plate 2, one end of the reducer body 1 provided with the output end 102 is fixedly connected to two fixing bolts 101, an annular embedding groove 201 is provided on the side of the first cover plate 2 away from the reducer body 1, an oil seal assembly is arranged on the side of the first cover plate 2 away from the reducer body 1, a protective mechanism is arranged on the side of the oil seal assembly away from the first cover plate 2, the protective mechanism is connected to the fixing bolt 101, the protective mechanism is extruded and connected to the oil seal assembly, the oil seal assembly includes a second oil seal 3 and a metal extrusion 4, the second oil seal 3 is made of rubber, and the protective mechanism includes a second cover plate 5.

[0031] An annular embedding piece 302 is fixedly connected to one side of the second oil seal 3 close to the first cover plate 2 , and the annular embedding piece 302 is embedded in the annular embedding groove 201 .

[0032] An extrusion groove 301 is formed on the outer wall of the second oil seal 3 .

[0033] The metal extrusion piece 4 is disposed in the extrusion groove 301 . The metal extrusion piece 4 is split and consists of two U-shaped rings. The metal extrusion piece 4 is annular as a whole. An upward inclined surface is disposed on one side of the metal extrusion piece 4 away from the second oil seal 3 .

[0034] An annular extrusion piece 502 is fixedly connected to the inner wall of the second cover plate 5 . The annular extrusion piece 502 is annular and is provided with a downward inclined surface.

[0035] The annular extrusion piece 502 is extruded and connected to the metal extrusion piece 4 , and the upward inclined surface of the metal extrusion piece 4 and the downward inclined surface of the annular extrusion piece 502 are extruded against each other, so that the metal extrusion piece 4 and the extrusion groove 301 of the second oil seal 3 are interference-fitted.

[0036] The second cover plate 5 surrounds the first cover plate 2 and the oil seal assembly as a whole.

[0037] Two fixing plates 501 are fixedly connected to the outer wall of the second cover plate 5. Through holes are provided in both fixing plates 501. The two fixing plates 501 are respectively docked with two fixing bolts 101, and a hexagonal nut 6 is threadedly connected to one end of the fixing bolt 101 passing through the fixing plate 501.

[0038] When installing the second cover plate 5, the annular extrusion member 502 will extrude the metal extrusion member 4, causing the metal extrusion member 4 to extrude towards the second oil seal 3 and making the second oil seal 3 extrude the output end 102, increasing the sealing performance of the second oil seal 3. The second oil seal 3 in the oil seal assembly plays a secondary sealing role after the first oil seal in the first cover plate 2 fails, preventing oil leakage. Moreover, the second oil seal 3 is extruded by the metal extrusion member 4, making the contact between the inner ring of the second oil seal 3 and the output end 102 closer, greatly improving the overall sealing performance of the second oil seal 3. And the second oil seal 3 is annular and has no opening, ensuring the sealing performance and solving the problem that the opening of the second oil seal 3 in the existing device may leak oil.

[0039] Working principle:

[0040] When installing the second cover plate 5, the annular extrusion member 502 will extrude the metal extrusion member 4, causing the metal extrusion member 4 to extrude towards the second oil seal 3 and making the second oil seal 3 extrude the output end 102, increasing the sealing performance of the second oil seal 3. The second oil seal 3 in the oil seal assembly plays a secondary sealing role after the first oil seal in the first cover plate 2 fails, preventing oil leakage. Moreover, the second oil seal 3 is extruded by the metal extrusion member 4, making the contact between the inner ring of the second oil seal 3 and the output end 102 closer, greatly improving the overall sealing performance of the second oil seal 3. And the second oil seal 3 is annular and has no opening, ensuring the sealing performance. The second cover plate 5 encloses the first cover plate 2, the second oil seal 3 and the metal extrusion member 4 as a whole, greatly increasing the protection performance.

[0041] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, rather than limitations on the implementation manners. For those of ordinary skill 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 enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A sealing device for a split reducer output shaft, comprising a reducer body (1), the reducer body (1) further comprising an output end (102), the reducer body (1) being fixedly connected to a first cover plate (2), characterized in that: The reducer body (1) is provided with an output end (102) at one end thereof, and is fixedly connected to two fixing bolts (101); the first cover plate (2) is provided with an annular engaging groove (201); an oil seal assembly is provided on a side of the first cover plate (2) away from the reducer body (1); a protection mechanism is provided on a side of the oil seal assembly away from the first cover plate (2); the protection mechanism is butted against the fixing bolts (101); and the protection mechanism is extrusion-connected to the oil seal assembly; The oil seal assembly comprises a second oil seal (3) and a metal extrusion part (4); The protection mechanism comprises a second cover plate (5).

2. A sealing device for a split reducer output shaft according to claim 1, characterized in that: An annular embedding piece (302) is fixedly connected to a side of the second oil seal (3) close to the first cover plate (2), and the annular embedding piece (302) is embedded in the annular embedding groove (201).

3. A sealing device for a split reducer output shaft as claimed in claim 2, characterized in that: An extrusion groove (301) is provided on the outer wall of the second oil seal (3).

4. A sealing device for a split reducer output shaft as claimed in claim 3, characterized in that: The metal extrusion piece (4) is arranged in the extrusion groove (301); the metal extrusion piece (4) is split and consists of two U-shaped rings; the metal extrusion piece (4) is annular as a whole; and an upward inclined surface is arranged on a side of the metal extrusion piece (4) away from the second oil seal (3).

5. A sealing device for a split reducer output shaft as claimed in claim 4, characterized in that: An annular extrusion piece (502) is fixedly connected to the inner wall of the second cover plate (5), and the annular extrusion piece (502) is provided with a downward inclined surface.

6. A sealing device for a split reducer output shaft as claimed in claim 5, characterized in that: The annular extrusion piece (502) is extruded and connected to the metal extrusion piece (4); the upward inclined surface of the metal extrusion piece (4) and the downward inclined surface of the annular extrusion piece (502) are mutually extruded, so that the metal extrusion piece (4) and the extrusion groove (301) provided in the second oil seal (3) are interference-fitted.

7. A sealing device for a split reducer output shaft according to claim 1, characterized in that: The second cover plate (5) surrounds the first cover plate (2) and the oil seal assembly as a whole.

8. A sealing device for a split reducer output shaft as claimed in claim 1, characterized in that: The outer wall of the second cover plate (5) is fixedly connected to two fixing plates (501), and the two fixing plates (501) are respectively connected to two fixing bolts (101), and one end of the fixing bolt (101) passes through the fixing plate (501) and is threadedly connected to a hexagonal nut (6).

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