Multi-layer sealing structure of three-in-one speed reduction assembly

Abstract

A multi-layer sealing structure of a three-in-one speed reduction assembly comprises a motor, a speed reducer shell coaxially and fixedly connected with a shell of the motor, a supporting sleeve which is supported at the front end of a rotating shaft of the motor through a bearing and extends into the speed reducer shell, an input shaft which extends into the supporting sleeve and is in spline connection with the front end of the rotating shaft, and a motor rear end cover assembled at the rear end of the rotating shaft. The sealing structure is characterized in that a first-layer sealing piece is assembled between the supporting sleeve and the input shaft, a second-layer sealing piece is assembled between the supporting sleeve and the rotating shaft, an oil storage cavity is formed between the second-layer sealing piece and the first-layer sealing piece, and a third-layer sealing piece for sealing the position between the motor rear end cover and the rotating shaft is assembled at the rear end of the rotating shaft. According to the three-in-one speed reduction assembly, the probability that oil enters a motor is reduced, the oil is prevented from entering a brake, the operation safety of the brake is improved, the sealing reliability of the three-in-one speed reduction assembly is improved, the oil leakage risk is reduced, and the operation safety is improved.

Description

Technical Field

[0001] The utility model relates to a multi-layer sealing structure of a three-in-one speed reducer assembly, belonging to the technical field of speed reducer sealing assembly. Background Art

[0002] The three-in-one reduction assembly is composed of a motor, a reducer and a brake. The front end of the motor's shaft is connected to the input shaft of the reducer, and the rear end of the shaft is assembled with the brake. In order to improve the integration of the reduction assembly and reduce the volume, the front end cover of the motor is generally omitted, and the reducer housing is directly used as the front end cover of the motor, and the brake is integrated into the rear end cover of the motor. In order to increase the speed ratio, the reducer generally adopts a multi-stage planetary reducer. The oil filling volume of the shell cavity of the multi-stage planetary reducer accounts for at least 1 / 3 of the internal volume and no more than 1 / 2. In order to prevent the oil in the reducer cavity from entering the motor, a support sleeve is generally installed on the front end of the motor shaft and the input shaft. The support sleeve extends into the inner cavity of the reducer housing and is fixed. An oil seal is pressed between the support sleeve and the input shaft to form a seal between the support sleeve and the input shaft to prevent the oil from flowing along the input shaft to the motor. The problems with this sealing structure are:

[0003] 1. During the operation of the reducer, the gears will wear and form iron chips, which will cause the oil seal lip to fail, resulting in oil leakage from the reducer input shaft to the motor.

[0004] 2. The brake integrated at the rear end of the motor shaft is generally an electromagnetic brake. If the oil flowing from the reducer input shaft to the motor flows through the motor shaft to the brake, it will affect the normal operation of the brake. Utility Model Content

[0005] The utility model provides a multi-layer sealing structure of the three-in-one reduction assembly, which uses a first layer of seal to seal between the support sleeve and the input shaft, and a second layer of seal to seal between the support sleeve and the rotating shaft. The oil leakage is stored in the oil storage chamber, which reduces the impact of the oil on the second layer of seal, extends the sealing life of the second layer of seal, and reduces the probability of oil entering the motor. The third layer of seal is used to seal between the rear end cover of the motor and the rotating shaft to prevent the oil flowing to the rear end of the rotating shaft along the rotating shaft from entering the brake, thereby improving the operating safety of the brake, improving the sealing reliability of the three-in-one reduction assembly, reducing the risk of oil leakage, and improving operating safety.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The multi-layer sealing structure of the three-in-one reduction assembly includes a motor, a reducer housing coaxially fixed to the motor housing, a support sleeve supported at the front end of the motor's rotating shaft by a bearing and extending into the reducer housing, an input shaft extending into the support sleeve and spline-connected to the front end of the rotating shaft, and a rear end cover of the motor assembled at the rear end of the rotating shaft. It is characterized in that a first layer of seal is assembled between the support sleeve and the input shaft, a second layer of seal is assembled between the support sleeve and the rotating shaft, an oil storage chamber is formed between the second layer of seal and the first layer of seal, and a third layer of seal is assembled at the rear end of the rotating shaft to seal the rear end cover of the motor and the rotating shaft.

[0008] Preferably, the support sleeve has a first annular positioning surface corresponding to the first layer of seal and a second annular positioning surface corresponding to the second layer of seal. The first layer of seal is pressed between the support sleeve and the input shaft and is against the first annular positioning surface. The second layer of seal is pressed between the support shaft and the rotating shaft and is against the second annular positioning surface. The support sleeve is equipped with a first shaft retaining ring for axially positioning the first layer of seal and a second shaft retaining ring for axially positioning the second layer of seal.

[0009] Preferably, the first layer of sealing member is a skeleton oil seal with a metal skeleton inside, and the second layer of sealing member is a rubber oil seal.

[0010] Preferably, the support sleeve is provided with an oil hole connecting the oil storage cavity and the inner cavity of the reducer housing.

[0011] Preferably, the support sleeve is provided with a first annular groove radially aligned with the first layer of seal and a second annular groove radially aligned with the second layer of seal, and the first annular groove and the second annular groove are respectively provided with O-rings in contact with the inner wall of the reducer housing.

[0012] Preferably, the third layer of seal is a sealing ring with a square cross section, and an annular groove corresponding to the third layer of seal is provided on the rear end cover of the motor. The third layer of seal clamps the rear end of the rotating end and is embedded in the annular groove.

[0013] The beneficial effects of the utility model are:

[0014] The multi-layer sealing structure of the three-in-one reduction gear assembly of the present invention comprises a first layer of sealing member assembled between the support sleeve and the input shaft, a second layer of sealing member assembled between the support shaft and the rotating shaft, and an oil storage chamber formed between the second layer of sealing member and the first layer of sealing member, wherein the first layer of sealing member is used to seal between the support sleeve and the input shaft to prevent the oil in the reducer housing from leaking outward along the input shaft, and the second layer of sealing member is used to seal between the support sleeve and the rotating shaft. When the sealing effect of the first layer of sealing member decreases and oil leakage occurs, the oil enters the oil storage chamber and is stored by the oil storage chamber, thereby preventing the leaked oil from flowing directly along the input shaft to the second layer of sealing member at the rear end of the rotating shaft, reducing the impact of the oil on the second layer of sealing member, extending the sealing life of the second layer of sealing member, and reducing the probability of oil entering the motor. The third layer of sealing member is used to seal between the rear end cover of the motor and the rotating shaft to prevent the oil flowing to the rear end of the rotating shaft along the rotating shaft from entering the brake, thereby improving the operating safety of the brake, improving the sealing reliability of the three-in-one reduction gear assembly, reducing the risk of oil leakage, and improving the operating safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the multi-layer sealing structure of the three-in-one reduction gear assembly in a specific embodiment.

[0016] Figure 2 for Figure 1 A partially enlarged schematic diagram of the locations of the first and second seal layers.

[0017] Figure 3 for Figure 1 A partially enlarged schematic diagram of the location of the third layer of seal. DETAILED DESCRIPTION

[0018] The following combination Figures 1-3 The embodiments of the present utility model are described in detail.

[0019] The multi-layer sealing structure of the three-in-one reduction assembly includes a motor 1, a reducer housing 2 coaxially fixed to the housing of the motor 1, a support sleeve 4 supported at the front end of the rotating shaft 3 of the motor 1 by a bearing and extending into the reducer housing 2, an input shaft 5 extending into the support sleeve and spline-connected to the front end of the rotating shaft 2, and a motor rear end cover 6 assembled at the rear end of the rotating shaft 3. It is characterized in that a first layer of seal 7 is assembled between the support sleeve 4 and the input shaft 5, a second layer of seal 8 is assembled between the support sleeve 4 and the rotating shaft 3, an oil storage chamber 9 is formed between the second layer of seal 8 and the first layer of seal 7, and a third layer of seal 10 is assembled at the rear end of the rotating shaft 3 to seal the motor rear end cover 6 and the rotating shaft 3.

[0020] The multi-layer sealing structure of the three-in-one reduction assembly described above is equipped with a first layer of seal 7 between the support sleeve 4 and the input shaft 5, and a second layer of seal 8 between the support shaft 4 and the rotating shaft 3. An oil storage chamber 9 is formed between the second layer of seal 8 and the first layer of seal 7. The first layer of seal 7 is used to seal between the support sleeve 4 and the input shaft 5 to prevent the oil in the reducer housing 2 from leaking outward along the input shaft. The second layer of seal 8 is used to seal between the support sleeve 4 and the rotating shaft 3. When the sealing effect of the first layer of seal 7 decreases and oil leakage occurs, the oil enters the oil storage chamber 9. The leaked oil is stored in the oil storage chamber 9 to prevent the leaked oil from flowing directly along the input shaft 5 to the second seal 8 at the rear end of the rotating shaft 3, thereby reducing the impact of the oil on the second seal 8, extending the sealing life of the second seal 8, and reducing the probability of oil entering the motor. The third seal 10 is used to seal the rear end cover 6 of the motor and the rotating shaft 3 to prevent the oil flowing along the rotating shaft 3 to the rear end of the rotating shaft from entering the brake, thereby improving the operating safety of the brake, improving the sealing reliability of the three-in-one reduction assembly, reducing the risk of oil leakage, and improving operating safety.

[0021] Among them, the support sleeve 4 has a first annular positioning surface 41 corresponding to the first layer of seal 7 and a second annular positioning surface 42 corresponding to the second layer of seal 8. The first layer of seal 7 is pressed between the support sleeve 4 and the input shaft 5 and is against the first annular positioning surface 41. The second layer of seal 8 is pressed between the support shaft 4 and the rotating shaft 3 and is against the second annular positioning surface 42. The support sleeve 4 is equipped with a first shaft retaining ring 43 for axial positioning of the first layer of seal 7 and a second shaft retaining ring 44 for axial positioning of the second layer of seal 8. As can be seen from the accompanying drawings, the first layer of seal 7 is pressed between the support sleeve 4 and the input shaft 5, and axial positioning is formed by the first annular positioning surface 41 and the first shaft retaining ring 43. The second layer of seal 8 is pressed between the support sleeve 4 and the rotating shaft 3, and axial positioning is formed by the second annular positioning surface 42 and the second shaft retaining ring 44. The support sleeve 4 is supported by bearings on the outer periphery of the rotating shaft 3 and the input shaft 5. The first layer of seal 7 and the second layer of seal 8 seal the inner cavity of the support sleeve 5 to form an oil storage cavity 9. The oil storage cavity 9 can accommodate oil leaked through the first layer of seal 7, reduce the impact of the oil on the second layer of seal 8, extend the sealing life of the second layer of seal 8, and reduce the probability of oil entering the motor.

[0022] The first seal 7 is a skeleton oil seal with a metal frame, while the second seal 8 is a rubber oil seal. The second seal 8 is assembled between the support sleeve 4 and the rotating shaft 3. The support sleeve 5 is supported at the rear end of the rotating shaft 3 via a bearing. The second seal 8 does not bear the radial force of the support sleeve 4, so a rubber oil seal is used for the second seal 8. The support shaft 5 is fixed to the reducer housing 2, and there is no bearing support between the support sleeve 4 and the input shaft 5. Therefore, the first seal 7 is a skeleton oil seal with a frame, which provides a certain degree of radial support for the support sleeve 4 and improves sealing reliability.

[0023] The support sleeve 4 is provided with an oil hole 45 connecting the oil reservoir 9 and the inner cavity of the reducer housing 2. The oil hole 45 guides the oil entering the oil reservoir 9 back into the inner cavity of the reducer housing 2, thereby preventing the oil pressure from increasing when the oil in the oil reservoir 9 increases and impacting the second sealing ring 8, thereby extending the sealing life of the second sealing ring 8.

[0024] The support sleeve 4 defines a first annular groove 46 radially aligned with the first seal 7 and a second annular groove 47 radially aligned with the second seal 8. O-rings 11 are respectively installed in the first annular groove 46 and the second annular groove 47 to contact the inner wall of the reducer housing 2. The contact between the O-rings 11 and the inner wall of the reducer housing 2 seals the support sleeve 4 and the reducer housing 2, preventing oil leakage between the support sleeve 4 and the reducer housing 2.

[0025] The third seal 10 is a sealing ring with a square cross-section. An annular groove 61 corresponding to the third seal 10 is defined on the motor rear end cover 6. The third seal 6 clamps the rear end of the rotating end 3 and fits into the annular groove 61. A brake is integrated into the motor rear end cover 6. To prevent oil from flowing through the rotating shaft 3 and into the brake, the third seal 10 seals between the rotating shaft 3 and the motor rear end cover 6. The annular groove 61 facilitates the installation and positioning of the third seal 6, improving sealing reliability.

[0026] The above is a complete description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the embodiments described are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

Claims

1. A multi-layer sealing structure for a three-in-one reduction gear assembly, comprising a motor, a reducer housing coaxially fixed to the motor housing, a support sleeve supported by a bearing at the front end of the motor's rotating shaft and extending into the reducer housing, an input shaft extending into the support sleeve and spline-connected to the front end of the rotating shaft, and a motor rear end cover assembled at the rear end of the rotating shaft, characterized in that: A first layer of seal is assembled between the support sleeve and the input shaft, a second layer of seal is assembled between the support sleeve and the rotating shaft, an oil storage cavity is formed between the second layer of seal and the first layer of seal, and a third layer of seal is assembled at the rear end of the rotating shaft to seal between the rear end cover of the motor and the rotating shaft.

2. The multi-layer sealing structure of the three-in-one reduction gear assembly according to claim 1, characterized in that: The support sleeve has a first annular positioning surface corresponding to the first layer of seal and a second annular positioning surface corresponding to the second layer of seal. The first layer of seal is pressed between the support sleeve and the input shaft and is against the first annular positioning surface. The second layer of seal is pressed between the support shaft and the rotating shaft and is against the second annular positioning surface. The support sleeve is equipped with a first shaft retaining ring for axially positioning the first layer of seal and a second shaft retaining ring for axially positioning the second layer of seal.

3. The multi-layer sealing structure of the three-in-one reduction gear assembly according to claim 2, characterized in that: The first layer of sealing element is a skeleton oil seal with a metal skeleton inside, and the second layer of sealing element is a rubber oil seal.

4. The multi-layer sealing structure of the three-in-one reduction gear assembly according to claim 1, characterized in that: The support sleeve is provided with an oil hole which connects the oil storage cavity and the inner cavity of the reducer housing.

5. The multi-layer sealing structure of the three-in-one reduction gear assembly according to claim 2, characterized in that: The support sleeve is provided with a first annular groove radially aligned with the first layer of seal and a second annular groove radially aligned with the second layer of seal. The first annular groove and the second annular groove are respectively provided with O-rings in contact with the inner wall of the reducer housing.

6. The multi-layer sealing structure of the three-in-one reduction gear assembly according to claim 1, characterized in that: The third layer of seal is a sealing ring with a square cross section. An annular groove corresponding to the third layer of seal is provided on the rear end cover of the motor. The third layer of seal clamps the rear end of the rotating end and is embedded in the annular groove.

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