Sealing structure for output end of cycloidal speed reducer

Abstract

The utility model relates to the technical field of speed reducers, in particular to a cycloid speed reducer output end sealing structure which comprises an input shaft shell and an output shaft shell which are arranged on the two sides of a gear shell respectively, an eccentric cavity is formed in the gear shell, and a first output bearing and a second output bearing are arranged between the front side of an output shaft and the inner wall of the output cavity. The two ends of the distance ring make contact with the first output bearing and the second output bearing correspondingly, the output shaft arranged in the output cavity serves as an output transmission end of the cycloidal gear, the first output bearing and the second output bearing are arranged between the front side of the output shaft and the inner wall of the output cavity, the output shaft is supported, and the use stability of the output shaft in the output cavity is improved; the distance ring is arranged between the first output bearing and the second output bearing, displacement of the first output bearing and the second output bearing in the close direction is limited through the distance ring, and the use stability between the first output bearing and the second output bearing is guaranteed.

Description

Technical Field

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

[0002] The cycloid reducer is a new transmission device that uses the planetary transmission principle and cycloid pin gear meshing. After the cycloid pinwheel reducer is decelerated, it needs to use the output mechanism to transmit the low-speed rotation motion of the cycloid wheel to the output shaft through the pin shaft, so as to obtain a lower output speed. When the output shaft is working, its sealing stability will affect the working stability of the cycloid wheel in the eccentric cavity. This requires that while ensuring the sealing reliability of the output shaft end, the output stability of the output shaft must also be considered. According to the structural characteristics of the output shaft, a more reasonable sealing space should be designed to improve the stability of the output shaft. Therefore, a sealing structure for the output end of the cycloid reducer is required. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a cycloid reducer output end sealing structure for solving the problem of output stability of the output shaft in the prior art.

[0004] In order to achieve the above purpose and other related purposes, the utility model provides the following technical solutions:

[0005] A cycloid reducer output end sealing structure, comprising:

[0006] A gear housing, wherein an input shaft housing and an output shaft housing are respectively arranged on both sides of the gear housing, an eccentric cavity is arranged inside the gear housing, and an input cavity and an output cavity connected to the eccentric cavity are respectively arranged inside the input shaft housing and the output shaft housing;

[0007] An output shaft is arranged in the output cavity, a first output bearing and a second output bearing are arranged between the front side of the output shaft and the inner wall of the output cavity, a distance ring sleeved on the output shaft is arranged on the output shaft between the first output bearing and the second output bearing, and two ends of the distance ring are respectively in contact with the first output bearing and the second output bearing.

[0008] To implement the above technical solution, an output shaft is arranged in the output cavity as the output transmission end of the cycloid gear, and a first output bearing and a second output bearing are arranged between the front side of the output shaft and the inner wall of the output cavity to support the output shaft, thereby improving the stability of the output shaft in use in the output cavity. In order to ensure the stability of the first output bearing and the second output bearing on the output shaft, a distance ring is arranged between the first output bearing and the second output bearing, and the distance ring is used to limit the displacement of the first output bearing and the second output bearing in a direction close to each other, thereby ensuring the stability of use between the first output bearing and the second output bearing.

[0009] In an embodiment of the present utility model, a shaft seat is arranged at the rear side of the output shaft. The radial dimension of the shaft seat is set to be larger than that of the output shaft, and the front side of the shaft seat presses tightly against the first output bearing.

[0010] To implement the above technical solution, by arranging a shaft seat at the rear side of the output shaft and setting the radial dimension of the shaft seat to be larger than that of the output shaft, the shaft seat is used to support the first output bearing, restricting the axial displacement of the first output bearing and ensuring the use stability of the first output bearing.

[0011] In an embodiment of the present utility model, a shaft seal cavity is arranged at the front side of the output cavity. A front oil seal is arranged in the shaft seal cavity, and the output cavity and the shaft seal cavity are arranged at intervals.

[0012] To implement the above technical solution, by arranging a shaft seal cavity at the front side of the output cavity and arranging a front oil seal in the shaft seal cavity, the sealing stability of the oil in the shaft seal cavity can be ensured. By arranging the output cavity and the shaft seal cavity at intervals, the fluidity of the oil can be improved, ensuring the use stability of the oil.

[0013] In an embodiment of the present utility model, an oil seal retaining ring is arranged between the output cavity and the shaft seal cavity. The radial dimension of the oil seal retaining ring is smaller than that of the shaft seal cavity, and the radial dimension of the shaft seal cavity is smaller than that of the output cavity.

[0014] To implement the above technical solution, by setting the radial dimension of the oil seal retaining ring to be smaller than that of the shaft seal cavity, the axial displacement of the front oil seal in the shaft seal cavity can be restricted. By setting the radial dimension of the shaft seal cavity to be smaller than that of the output cavity, the displacement of the second output bearing in the direction of the front side of the output shaft can be restricted by the oil seal retaining ring, thereby improving the use stability of the second output bearing and the use stability of the front oil seal.

[0015] In an embodiment of the present utility model, a rear housing flange is arranged at one end of the input shaft housing in contact with the gear housing. The rear housing flange and the gear housing are connected by bolts. A front housing flange is arranged at one end of the input shaft housing away from the gear housing, and the front housing flange is connected to an external fixing seat.

[0016] To implement the above technical solution, by setting the connection between the rear housing flange and the gear housing by bolts, the connection stability between the input shaft housing and the gear housing is ensured. By arranging a front housing flange at one end of the input shaft housing away from the gear housing and connecting the front housing flange to an external fixing seat, the convenience and stability of connecting the input shaft housing to the external fixing seat are improved, and no drilling treatment needs to be carried out on the input shaft housing.

[0017] In an embodiment of the present utility model, the outer walls of the first output bearing and the second output bearing are in contact with the inner wall of the output cavity. A bearing guide ring is arranged at the rear side of the inner wall of the output cavity, and the bearing guide ring is arranged in a flared shape.

[0018] To implement the above technical solution, by bringing the outer walls of the first output bearing and the second output bearing into contact with the inner wall of the output cavity, the output cavity is used to limit the first output bearing and the second output bearing, ensuring the stability of the use of the first output bearing and the second output bearing. By arranging a bearing guide ring at the rear side of the inner wall of the output cavity, and the bearing guide ring is arranged in a flared shape, it can provide guiding treatment during the installation of the bearing, improving the convenience during the installation of the bearing.

[0019] As described above, a cycloid speed reducer output end sealing structure of the present utility model has the following beneficial effects: The output shaft arranged in the output cavity serves as the output transmission end of the cycloid teeth. By arranging the first output bearing and the second output bearing between the front side of the output shaft and the inner wall of the output cavity to support the output shaft, the stability of the use of the output shaft in the output cavity is improved. In order to ensure the stability of the use of the first output bearing and the second output bearing on the output shaft, a fixed-distance ring is arranged between the first output bearing and the second output bearing, and the fixed-distance ring is used to limit the displacement of the first output bearing and the second output bearing in the direction of approaching each other, ensuring the stability of the use between the first output bearing and the second output bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It shows a schematic structural diagram of the cycloid speed reducer output end sealing structure disclosed in the embodiment of the present utility model.

[0021] Figure 2 It shows a schematic structural diagram of the output cavity of the cycloid speed reducer output end sealing structure disclosed in the embodiment of the present utility model.

[0022] Figure 3 It shows Figure 2 a partial enlarged view of reference numeral A in the drawing.

[0023] Figure 4 It shows Figure 2 a partial enlarged view of reference numeral B in the drawing.

[0024] DESCRIPTION OF REFERENCE NUMERALS

[0025] 1. Gear housing; 2. Input shaft housing; 3. Output shaft housing; 4. Eccentric cavity; 5. Input cavity; 6. Output cavity; 7. Output shaft; 8. First output bearing; 9. Second output bearing; 10. Fixed-distance ring; 11. Axle seat; 12. Shaft seal cavity; 13. Oil seal retaining ring; 14. Rear housing flange; 15. Front housing flange; 16. Bearing guide ring. 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 4 , the present utility model provides a sealing structure at the output end of a cycloid speed reducer, which includes that input shaft housings 2 and output shaft housings 3 are respectively arranged on both sides of a gear housing 1. An eccentric cavity 4 is arranged inside the gear housing 1. An input cavity 5 and an output cavity 6 communicating with the eccentric cavity 4 are respectively arranged inside the input shaft housing 2 and the output shaft housing 3. An output shaft 7 is arranged inside the output cavity 6. A first output bearing 8 and a second output bearing 9 are arranged between the front side of the output shaft 7 and the inner wall of the output cavity 6. A spacing ring 10 sleeved on the output shaft 7 is arranged on the output shaft 7 between the first output bearing 8 and the second output bearing 9. Both ends of the spacing ring 10 are respectively in contact with the first output bearing 8 and the second output bearing 9. Through the output shaft 7 arranged inside the output cavity 6, as the output transmission end of the cycloid teeth, by arranging the first output bearing 8 and the second output bearing 9 between the front side of the output shaft 7 and the inner wall of the output cavity 6, the output shaft 7 is supported, and the use stability of the output shaft 7 inside the output cavity 6 is improved. In order to ensure the use stability of the first output bearing 8 and the second output bearing 9 on the output shaft 7, by arranging the spacing ring 10 between the first output bearing 8 and the second output bearing 9, the displacement of the first output bearing 8 and the second output bearing 9 in the direction of approaching each other is restricted by the spacing ring 10, and the use stability between the first output bearing 8 and the second output bearing 9 is ensured.

[0028] A shaft seat 11 is arranged at the rear side of the output shaft 7. The radial dimension of the shaft seat 11 is set to be larger than the radial dimension of the output shaft 7. The front side of the shaft seat 11 abuts against the first output bearing 8 tightly. By arranging the shaft seat 11 at the rear side of the output shaft 7 and setting the radial dimension of the shaft seat 11 to be larger than the radial dimension of the output shaft 7, the first output bearing 8 is supported by the shaft seat 11, and the axial displacement of the first output bearing 8 is restricted, ensuring the use stability of the first output bearing 8.

[0029] A shaft seal cavity 12 is arranged at the front side of the output cavity 6. A front oil seal is arranged inside the shaft seal cavity 12. The output cavity 6 and the shaft seal cavity 12 are arranged at intervals. By arranging the shaft seal cavity 12 at the front side of the output cavity 6 and arranging the front oil seal inside the shaft seal cavity 12, the sealing stability of the oil fluid inside the shaft seal cavity 12 can be ensured. By arranging the output cavity 6 and the shaft seal cavity 12 at intervals, the fluidity of the oil fluid can be improved, ensuring the use stability of the oil fluid.

[0030] An oil seal retaining ring 13 is provided between the output cavity 6 and the shaft seal cavity 12. The radial dimension of the oil seal retaining ring 13 is smaller than that of the shaft seal cavity 12, and the radial dimension of the shaft seal cavity 12 is smaller than that of the output cavity 6. By making the radial dimension of the oil seal retaining ring 13 smaller than that of the shaft seal cavity 12, the axial displacement of the front oil seal in the shaft seal cavity 12 can be restricted. By making the radial dimension of the shaft seal cavity 12 smaller than that of the output cavity 6, the oil seal retaining ring 13 can be used to restrict the displacement of the second output bearing 9 in the forward direction of the output shaft 7, thereby improving the service stability of the second output bearing 9 and the front oil seal.

[0031] A rear housing flange 14 is provided at one end of the input shaft housing 2 in contact with the gear housing 1. The rear housing flange 14 is bolted to the gear housing 1. A front housing flange 15 is provided at the end of the input shaft housing 2 away from the gear housing 1. The front housing flange 15 is connected to an external fixed seat. By setting the bolt connection between the rear housing flange 14 and the gear housing 1, the connection stability between the input shaft housing 2 and the gear housing 1 is ensured. By providing the front housing flange 15 at the end of the input shaft housing 2 away from the gear housing 1 and using the front housing flange 15 to connect to the external fixed seat, the convenience and stability of connecting the input shaft housing 2 to the external fixed seat are improved, and no drilling treatment is required on the input shaft housing 2.

[0032] The outer walls of the first output bearing 8 and the second output bearing 9 are in contact with the inner wall of the output cavity 6. A bearing guide ring 16 is provided at the rear side of the inner wall of the output cavity 6. The bearing guide ring 16 is arranged in a flared shape. By making the outer walls of the first output bearing 8 and the second output bearing 9 contact the inner wall of the output cavity 6, the output cavity 6 is used to limit the positions of the first output bearing 8 and the second output bearing 9, ensuring the service stability of the first output bearing 8 and the second output bearing 9. By providing the bearing guide ring 16 at the rear side of the inner wall of the output cavity 6 and using the flared shape of the bearing guide ring 16, guidance can be provided during bearing installation, improving the convenience during bearing installation.

[0033] In the present utility model, an output shaft provided in the output cavity serves as the output transmission end of the cycloidal teeth. By providing a first output bearing and a second output bearing between the front side of the output shaft and the inner wall of the output cavity to support the output shaft, the service stability of the output shaft in the output cavity is improved. In order to ensure the service stability of the first output bearing and the second output bearing on the output shaft, a spacer ring is provided between the first output bearing and the second output bearing to restrict the displacement of the first output bearing and the second output bearing in the direction of approaching each other, ensuring the service stability between the first output bearing and the second output bearing.

[0034] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit 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 concept disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A cycloid reducer output end sealing structure, characterized in that: include: A gear housing, wherein an input shaft housing and an output shaft housing are respectively arranged on both sides of the gear housing, an eccentric cavity is arranged inside the gear housing, and an input cavity and an output cavity connected to the eccentric cavity are respectively arranged inside the input shaft housing and the output shaft housing; An output shaft is arranged in the output cavity, a first output bearing and a second output bearing are arranged between the front side of the output shaft and the inner wall of the output cavity, a distance ring sleeved on the output shaft is arranged on the output shaft between the first output bearing and the second output bearing, and two ends of the distance ring are respectively in contact with the first output bearing and the second output bearing.

2. The cycloid reducer output end sealing structure according to claim 1, characterized in that: A shaft seat is arranged at the rear side of the output shaft, the radial dimension of the shaft seat is larger than the radial dimension of the output shaft, and the front side of the shaft seat is pressed tightly against the first output bearing.

3. The cycloid reducer output end sealing structure according to claim 1, characterized in that: A shaft sealing chamber is arranged at the front side of the output chamber, a front oil seal is arranged in the shaft sealing chamber, and the output chamber and the shaft sealing chamber are arranged at an interval.

4. The cycloid reducer output end sealing structure according to claim 1, characterized in that: An oil seal baffle ring is arranged between the output cavity and the shaft seal cavity, the radial dimension of the oil seal baffle ring is smaller than the radial dimension of the shaft seal cavity, and the radial dimension of the shaft seal cavity is smaller than the radial dimension of the output cavity.

5. The cycloid reducer output end sealing structure according to claim 1, characterized in that: A rear housing flange is arranged at one end of the input shaft housing contacting the gear housing, and the rear housing flange is connected to the gear housing via bolts; a front housing flange is arranged at one end of the input shaft housing away from the gear housing, and the front housing flange is connected to an external fixing seat.

6. The cycloid reducer output end sealing structure according to claim 1, characterized in that: The outer walls of the first output bearing and the second output bearing contact the inner wall of the output cavity. A bearing guide ring is arranged at the rear side of the inner wall of the output cavity. The bearing guide ring is arranged in a trumpet shape.

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