Sealing structure of cycloidal speed reducer

Abstract

The utility model relates to the technical field of speed reducers, in particular to a cycloid speed reducer sealing structure which comprises a gear shell arranged between an input flange and an output flange, an eccentric cavity arranged in the gear shell, an eccentric body arranged in the eccentric cavity, and a hollow shaft penetrating through the input flange, the output flange and the gear shell. A front bearing and a rear bearing are arranged on the hollow shaft on the two axial sides of the eccentric body, a front check ring and a rear check ring are arranged between the two ends of the eccentric body and the front bearing and the rear bearing, and the input flange, the output flange and the gear shell are connected through shell bolts, so that the connection stability between the input flange and the gear shell and between the output flange and the gear shell can be guaranteed; the front bearing and the rear bearing are arranged on the hollow shaft, the hollow shaft can be supported through the front bearing and the rear bearing, the eccentric cavity can be sealed through the front check ring and the rear check ring which are arranged at the two ends of the eccentric body, it is guaranteed that oil in the eccentric cavity cannot seep out of the hollow shaft, and the lubricating stability of the eccentric body is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducers, in particular to a sealing structure of a cycloid speed reducer. Background Art

[0002] A cycloid speed reducer is a new transmission device that applies the planetary transmission principle and adopts cycloid pin gear meshing. Two roller bearings called rotating arms are installed on the eccentric sleeve to form an H mechanism. The central holes of the two cycloid wheels are the raceways of the rotating arm bearings on the eccentric sleeve, and the cycloid wheels mesh with a group of annularly arranged pin teeth on the pin gear to form an internal meshing reduction mechanism with a tooth difference of one tooth. The cycloid speed reducer has a large reduction ratio, obvious reduction effect, stable operation and low noise. However, engine oil usually needs to be added to the speed reducer to lubricate the components, especially for the lubrication of the eccentric cavity. Since its processing requirements are higher than those of traditional involute gears, the demand for lubrication during use is also relatively higher. At this time, the lubrication stability of the eccentric cavity is particularly important, and oil leakage and seepage cannot occur. Therefore, a sealing structure for a cycloid speed reducer is needed. Summary of the Utility Model

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a sealing structure of a cycloid speed reducer to solve the problem of the sealing stability of the eccentric cavity in the prior art.

[0004] To achieve the above purpose and other related purposes, the present utility model provides the following technical solutions:

[0005] A sealing structure of a cycloid speed reducer, comprising:

[0006] An input flange and an output flange, a gear housing is arranged between the input flange and the output flange, the input flange and the output flange are connected to the gear housing by housing bolts, and an eccentric cavity is arranged in the gear housing, and an eccentric body is arranged in the eccentric cavity;

[0007] A hollow shaft, the hollow shaft penetrates through the input flange, the output flange and the gear housing, the hollow shaft passes through the eccentric body, a front bearing and a rear bearing are arranged on the hollow shaft on both axial sides of the eccentric body, and a front retaining ring and a rear retaining ring are arranged between the two ends of the eccentric body and the front bearing and the rear bearing.

[0008] By connecting the input flange, the output flange and the gear housing with housing bolts, the connection stability between the input flange, the output flange and the gear housing can be ensured, and at the same time, the disassembly process between the input flange, the output flange and the gear housing can be facilitated. By arranging the front bearing and the rear bearing on the hollow shaft, the hollow shaft can be supported by the front bearing and the rear bearing, and the front retaining ring and the rear retaining ring arranged at both ends of the eccentric body can play a sealing role in the eccentric cavity, ensuring that the oil in the eccentric cavity will not seep out from the hollow shaft and ensuring the lubrication stability of the eccentric body.

[0009] In an embodiment of the present utility model, flange bases are provided on both sides of the input flange and the output flange that contact the gear housing. The radial dimension of the flange base matches the radial dimension of the gear housing, and the housing bolts pass through the flange base and the gear housing.

[0010] By matching the radial dimension of the flange base with the radial dimension of the gear housing, the cooperation stability between the flange base and the gear housing can be improved, thereby ensuring the connection reliability between the input flange, the output flange and the gear housing.

[0011] In an embodiment of the present utility model, oil stop washers are provided between the two ends of the gear housing and the flange base.

[0012] By providing the oil stop washers, the sealing reliability between the two ends of the gear housing and the flange base can be ensured, and oil leakage from the connection between the two ends of the gear housing and the flange base can be avoided.

[0013] In an embodiment of the present utility model, the front retaining ring and the rear retaining ring are sleeved on the hollow shaft, and there is an interval fit between the front retaining ring and the rear retaining ring that support both ends of the eccentric body and the inner wall of the eccentric cavity.

[0014] By providing an interval fit between the front retaining ring and the rear retaining ring that support both ends of the eccentric body and the inner wall of the eccentric cavity, it can be ensured that when the eccentric body moves, there is no friction between both ends and the inner wall of the eccentric cavity, improving the stability of the eccentric body during movement, reducing the operating temperature in the eccentric cavity at the same time, and improving the operating stability of the equipment.

[0015] In an embodiment of the present utility model, a shaft retaining ring is provided on the hollow shaft outside the rear bearing.

[0016] By providing the bearing retaining ring, it can play a role in limiting the position of the rear bearing on the hollow shaft and improve the use stability of the rear bearing on the hollow shaft.

[0017] In an embodiment of the present utility model, an oil cavity is provided between the front side of the hollow shaft and the input flange, and an oil seal is provided on the hollow shaft to seal the oil cavity.

[0018] The provision of the oil cavity can provide a lubrication space for the oil, while the oil seal seals the hollow shaft to ensure the sealing stability of the oil cavity.

[0019] In an embodiment of the present utility model, there is a key connection between the hollow shaft and the eccentric body.

[0020] By means of the key connection, the movement synchronism between the hollow shaft and the eccentric body can be improved.

[0021] As described above, a sealing structure of a cycloid speed reducer of the present utility model has the following beneficial effects: By connecting the input flange and the output flange to the gear housing through the housing bolts, while ensuring the connection stability between the input flange and the output flange and the gear housing, it is also convenient to disassemble the input flange and the output flange from the gear housing. By arranging the front bearing and the rear bearing on the hollow shaft, the hollow shaft can be supported by the front bearing and the rear bearing, and the front retaining ring and the rear retaining ring arranged at both ends of the eccentric body can seal the eccentric cavity, ensuring that the oil in the eccentric cavity will not leak out from the hollow shaft and guaranteeing the lubrication stability of the eccentric body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It shows a schematic structural diagram of the sealing structure of the cycloid speed reducer disclosed in the embodiment of the present utility model.

[0023] Figure 2 It shows a schematic structural diagram of the eccentric cavity of the sealing structure of the cycloid speed reducer disclosed in the embodiment of the present utility model.

[0024] DESCRIPTION OF REFERENCE NUMERALS

[0025] 1. Input flange; 2. Output flange; 3. Gear housing; 4. Housing bolt; 5. Eccentric cavity; 6. Eccentric body; 7. Hollow shaft; 8. Front bearing; 9. Rear bearing; 10. Front retaining ring; 11. Rear retaining ring; 12. Flange base; 13. Shaft retaining ring; 14. Oil cavity; 15. Oil seal. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0027] Please refer to Figures 1 to 2 , the present utility model provides a sealing structure of a cycloid speed reducer, including a gear housing 3 arranged between an input flange 1 and an output flange 2. The input flange 1 and the output flange 2 are connected to the gear housing 3 through housing bolts 4, and an eccentric cavity 5 is arranged in the gear housing 3. An eccentric body 6 is arranged in the eccentric cavity 5. A hollow shaft 7 passes through the input flange 1, the output flange 2 and the gear housing 3. The hollow shaft 7 passes through the eccentric body 6. A front bearing 8 and a rear bearing 9 are arranged on the hollow shaft 7 on both axial sides of the eccentric body 6. A front retaining ring 10 and a rear retaining ring 11 are arranged between both ends of the eccentric body 6 and the front bearing 8 and the rear bearing 9.

[0028] The input flange 1 and the output flange 2 are connected to the gear housing 3 through the housing bolts 4. While ensuring the connection stability between the input flange 1 and the output flange 2 and the gear housing 3, it is also convenient for the disassembly between the input flange 1 and the output flange 2 and the gear housing 3. By arranging the front bearing 8 and the rear bearing 9 on the hollow shaft 7, the hollow shaft 7 can be supported by the front bearing 8 and the rear bearing 9. The front retaining ring 10 and the rear retaining ring 11 arranged at both ends of the eccentric body 6 can seal the eccentric cavity 5, ensuring that the oil in the eccentric cavity 5 will not leak out from the hollow shaft 7 and guaranteeing the lubrication stability of the eccentric body 6.

[0029] Flange bases 12 are arranged on the sides of the input flange 1 and the output flange 2 that contact the gear housing 3. The radial dimension of the flange base 12 matches the radial dimension of the gear housing 3. The housing bolts 4 pass through the flange base 12 and the gear housing 3. By matching the radial dimension of the flange base 12 with the radial dimension of the gear housing 3, the matching stability between the flange base 12 and the gear housing 3 can be improved, thus ensuring the connection reliability between the input flange 1 and the output flange 2 and the gear housing 3.

[0030] Oil-stop washers are arranged between the two ends of the gear housing 3 and the flange base 12. By arranging the oil-stop washers, the sealing reliability between the two ends of the gear housing 3 and the flange base 12 can be ensured, avoiding oil leakage from the connection between the two ends of the gear housing 3 and the flange base 12.

[0031] The front retaining ring 10 and the rear retaining ring 11 are sleeved on the hollow shaft 7. Moreover, the front retaining ring 10 and the rear retaining ring 11 support the spaced fit between the two ends of the eccentric body 6 and the inner wall of the eccentric cavity 5. By arranging the front retaining ring 10 and the rear retaining ring 11 to support the spaced fit between the two ends of the eccentric body 6 and the inner wall of the eccentric cavity 5, it can be ensured that when the eccentric body 6 moves, there is no friction between the two ends and the inner wall of the eccentric cavity 5, improving the stability of the eccentric body 6 during movement. At the same time, the operating temperature in the eccentric cavity 5 is reduced, improving the operating stability of the equipment.

[0032] An axle retaining ring 13 is arranged on the hollow shaft 7 outside the rear bearing 9. The arrangement of the bearing retaining ring can limit the position of the rear bearing 9 on the hollow shaft 7, improving the service stability of the rear bearing 9 on the hollow shaft 7.

[0033] An oil cavity 14 is arranged between the front side of the hollow shaft 7 and the input flange 1. An oil seal 15 is provided on the hollow shaft 7 to seal the oil cavity 14. The arrangement of the oil cavity 14 can provide a lubrication space for the oil, while the oil seal 15 seals the hollow shaft 7, ensuring the sealing stability of the oil cavity 14.

[0034] The hollow shaft 7 and the eccentric body 6 are connected by a key. Through the key connection, the movement synchronism between the hollow shaft 7 and the eccentric body 6 can be improved.

[0035] The utility model connects the input flange and the output flange to the gear housing through housing bolts. While ensuring the connection stability between the input flange and the output flange and the gear housing, it can also facilitate the disassembly between the input flange and the output flange and the gear housing. By arranging a front bearing and a rear bearing on the hollow shaft, the hollow shaft can be supported by the front bearing and the rear bearing. The front retaining ring and the rear retaining ring arranged at both ends of the eccentric body can play a sealing role for the eccentric cavity, ensuring that the oil in the eccentric cavity will not leak out from the hollow shaft and guaranteeing the lubrication stability of the eccentric body.

[0036] The above embodiments are only illustrative of the principles and effects of the present utility model, rather than limiting the present utility model. All equivalent modifications or changes made by those with ordinary knowledge in the technical field to which the present utility model pertains without departing from the spirit and technical ideas disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A cycloid reducer sealing structure, characterized in that: include: An input flange and an output flange, a gear housing is arranged between the input flange and the output flange, the input flange and the output flange are connected to the gear housing through housing bolts, and an eccentric cavity is arranged in the gear housing, and an eccentric body is arranged in the eccentric cavity; A hollow shaft passes through the input flange, the output flange and the gear housing, and passes through the eccentric body. A front bearing and a rear bearing are arranged on the hollow shaft along the axial sides of the eccentric body, and a front retaining ring and a rear retaining ring are arranged between the two ends of the eccentric body and the front bearing and the rear bearing.

2. The cycloid reducer sealing structure according to claim 1, characterized in that: The input flange and the output flange are both provided with flange bases on the side contacting the gear housing. The radial dimension of the flange base matches the radial dimension of the gear housing. The housing bolts penetrate the flange base and the gear housing.

3. The cycloid reducer sealing structure according to claim 1, characterized in that: Oil-stop washers are arranged between the two ends of the gear housing and the flange base.

4. The cycloid reducer sealing structure according to claim 1, characterized in that: The front retaining ring and the rear retaining ring are sleeved on the hollow shaft, and the front retaining ring and the rear retaining ring support the two ends of the eccentric body and the inner wall of the eccentric cavity to be spaced and matched.

5. The cycloid reducer sealing structure according to claim 1, characterized in that: A shaft retaining ring is arranged on the hollow shaft outside the rear bearing.

6. The cycloid reducer sealing structure according to claim 1, characterized in that: An oil cavity is arranged between the front side of the hollow shaft and the input flange, and an oil seal is arranged on the hollow shaft to seal the oil cavity.

7. The cycloid reducer sealing structure according to claim 1, characterized in that: The hollow shaft and the eccentric body are key-connected.

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