Sealing structure of output shaft of speed reducer
By adopting a combined sealing structure of static ring, dynamic ring, maze seal unit and skeleton oil seal on the output shaft of the reducer, the oil leakage problem during vertical installation is solved, and the normal operation and environmental protection of the reducer are achieved.
Patent Information
- Application Number
- CN202422563652.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-10-23
AI Technical Summary
When the reducer is installed vertically, oil leakage at the output end is prone to occur, which leads to accumulation of lubricant oil, polluting the environment, increasing maintenance workload and safety hazards, and may damage the equipment.
The combined sealing structure of a static ring, a moving ring, a labyrinth sealing unit and a plurality of skeleton oil seals is adopted, including a first sealing unit between the flange and the output shaft, a labyrinth sealing unit between the static ring and the moving ring and the oil discharge pipe, forming a multiple sealing effect.
Effectively prevent lubricating oil from leaking from the gap, ensure that the reducer operates normally during vertical installation, reduce oil leakage, improve the environment, and reduce maintenance costs.
Smart Images
Figure CN223076179U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of speed reducer sealing, and relates to a sealing structure for the output shaft of a speed reducer. Background Technique
[0002] As an important mechanical component, the main function of a speed reducer is to transmit torque and adjust the rotational speed in industrial production. It is located between the power source and the actuator and plays an indispensable role as a transmission device in various mechanical equipment. Whether it is a precision automated production line or a large-scale construction machinery, the speed reducer is one of the key components to ensure the stable operation of the system.
[0003] However, in the actual application process, especially in the case of vertical installation, the speed reducer often faces a common problem - oil leakage at the output end. This is because the speed reducer usually adopts an oil bath lubrication method to ensure the good operating state of moving parts such as gears. When installed horizontally, this lubrication method can effectively reduce wear and maintain the efficient operation of the equipment. However, when installed vertically, due to the action of gravity, the lubricating oil is more likely to accumulate at the seal of the output shaft, resulting in the failure or accelerated wear of the oil seal, and finally leading to the oil leakage phenomenon.
[0004] Minor oil leakage not only pollutes the surrounding environment and increases the workload of cleaning and maintenance, but also the leaked lubricating oil may pose a safety hazard to the operators. More seriously, when the oil leakage situation worsens, it will not only have an adverse impact on the operation of the speed reducer itself, such as increasing frictional losses and reducing the service life, but may even cause damage to the equipment, thereby interrupting the production process and bringing economic losses to the enterprise.
[0005] Therefore, how to effectively solve the problem of oil leakage at the output end of the speed reducer during vertical installation has become an important topic for improving the reliability of the equipment and extending its service life. In view of this situation, this application proposes a sealing structure for the output shaft of a speed reducer, aiming to reduce or eliminate the occurrence of oil leakage, which is of great significance for improving the efficiency and safety of industrial production. Content of the Utility Model
[0006] The purpose of the utility model is to provide a sealing structure for the output shaft of a speed reducer to solve the technical problems mentioned in the above background technique.
[0007] The technical solution for achieving the purpose of the utility model is:
[0008] A sealing structure for the output shaft of a speed reducer, used to seal the gap between the sealing flange and the output shaft, including a static ring, a dynamic ring, a first sealing unit, and a labyrinth sealing unit; the flange is coaxially sleeved outside the output shaft and fixedly installed on the speed reducer, and there is a first gap between the flange and the output shaft. A first sealing unit is arranged in the first gap, the first sealing unit is fixedly connected to the flange, and the first sealing unit is rotatably connected to the output shaft; the dynamic ring is coaxially sleeved outside the output shaft and fixedly connected to the output shaft; the static ring is sleeved outside the dynamic ring and rotatably connected to the dynamic ring, the upper end of the static ring is fixedly connected to the lower end of the flange, and there is a second gap between the static ring and the dynamic ring. The labyrinth sealing unit is arranged inside the second gap to seal the second gap;
[0009] The sealing structure of the output shaft of the speed reducer of the present invention is composed of a flange, a static ring, a dynamic ring, an output shaft, a first sealing unit, and a labyrinth sealing unit, and the structure is simple. Among them, the first sealing unit is arranged between the flange and the output shaft to prevent grease from leaking out of the gap between the flange and the output shaft. At the same time, a labyrinth sealing unit is arranged in the second gap between the static ring and the dynamic ring, which can effectively prevent grease from seeping out of the second gap between the static ring and the dynamic ring, thereby enhancing the sealing effect of the entire sealing structure; the sealing structure of the output shaft of the speed reducer of the present invention ensures that the speed reducer can operate normally when installed vertically, reduces the oil leakage phenomenon, not only improves the surrounding environment, but also reduces the maintenance cost.
[0010] Furthermore, a plurality of oil discharge pipes communicating with the first gap are provided near the lower end of the static ring, and a labyrinth sealing unit is provided at the inner pipe orifice of the oil discharge pipe.
[0011] The oil discharge pipes on the static ring of the present invention can help guide the excess grease to a safe area, avoiding leakage caused by grease accumulation. Among them, the labyrinth component is arranged at the inner pipe orifice of the oil discharge pipe to seal the oil discharge pipe, preventing grease from leaking from the oil discharge pipe, further improving the sealing effect of the sealing structure and reducing the oil leakage phenomenon.
[0012] Furthermore, a notch is provided on one side of the lower end of the inner ring close to the dynamic ring, and a second sealing unit is provided at the notch. The second sealing unit is fixedly installed on the inner ring, and the second sealing unit is rotatably connected to the dynamic ring.
[0013] A notch is provided on one side of the lower end of the inner ring of the present invention close to the dynamic ring, and a second sealing unit is arranged at the notch for sealing the bottom of the second gap. Cooperating with the labyrinth sealing unit, a double-sealing effect is achieved; and the second sealing unit and the dynamic ring are rotatably connected, which not only ensures the sealing performance but also does not affect the normal rotation of the output shaft of the speed reducer.
[0014] Furthermore, the labyrinth seal unit includes an outer ring and an inner ring. The outer ring is fixedly installed on the outer peripheral surface of the moving ring in an inverted L shape, and the inner ring is fixedly installed on the inner peripheral surface of the stationary ring in an L shape. The part of the outer ring parallel to the output shaft extends axially between the inner ring and the stationary ring, and the part of the inner ring parallel to the output shaft extends axially between the outer ring and the moving ring. A third gap is left between the outer ring and the inner ring.
[0015] In the labyrinth seal unit of the present utility model, the axial cross-sections of the outer ring fixedly installed on the outer peripheral surface of the moving ring and rotatably connected to the stationary ring, and the inner ring fixedly installed on the inner peripheral surface of the stationary ring and rotatably connected to the moving ring are both L-shaped surfaces, and the two are staggeredly buckled to form a labyrinth structure. The third gap left between the outer ring and the inner ring has a special throttling effect. When grease attempts to pass through these tortuous third gaps, a throttling effect will be generated, thereby achieving the purpose of leakage prevention. It can not only ensure that the output shaft is fully lubricated and rotates normally, but also ensure good sealing effect, thereby guaranteeing the normal operation of the speed reducer during vertical installation, reducing oil leakage, improving the surrounding environment, and reducing maintenance costs.
[0016] Furthermore, the bottom of the outer ring extends downward to the inner pipe orifice of the oil discharge pipe, and one end gap orifice of the third gap corresponds to and communicates with the lower half of the inner pipe orifice of the oil discharge pipe.
[0017] The bottom of the outer ring of the present utility model extends downward to the inner pipe orifice of the oil discharge pipe, so that one end gap orifice of the third gap corresponds to and communicates with the lower half of the inner pipe orifice of the oil discharge pipe. Such a design can not only guide the excess grease to a safe area to avoid leakage caused by accumulation, but also effectively seal the area between the outer ring and the oil discharge pipe to prevent a large amount of grease from leaking from this gap.
[0018] Furthermore, the first seal unit adopts a plurality of skeleton oil seals, and the plurality of skeleton oil seals are stacked axially in the first gap between the flange and the output shaft.
[0019] The first seal unit of the present utility model adopts a plurality of skeleton oil seals, and the plurality of skeleton oil seals are stacked axially in the first gap between the flange and the output shaft, which can enhance the sealing effect and effectively prevent grease from leaking out of the gap between the flange and the output shaft.
[0020] Furthermore, the second seal unit adopts a skeleton oil seal.
[0021] Adopting the above technical solutions, the present utility model has the following beneficial effects:
[0022] (1) The sealing structure of the output shaft of the speed reducer of the present utility model is composed of a flange plate, a stationary ring, a rotating ring, an output shaft, a first sealing unit, and a labyrinth sealing unit. The structure is simple. Among them, the first sealing unit is arranged between the flange plate and the output shaft to prevent grease from leaking out through the gap between the flange plate and the output shaft. At the same time, a labyrinth sealing unit is arranged in the second gap between the stationary ring and the rotating ring, which can effectively prevent grease from seeping out through the second gap between the stationary ring and the rotating ring, thereby enhancing the sealing effect of the entire sealing structure. The sealing structure of the output shaft of the speed reducer of the present utility model ensures the normal operation of the speed reducer during vertical installation, reduces oil leakage, not only improves the surrounding environment but also reduces the maintenance cost.
[0023] (2) The oil discharge pipe on the stationary ring of the present utility model can help guide the excess grease to a safe area, avoiding leakage caused by grease accumulation. Among them, a labyrinth component is arranged at the inner pipe orifice of the oil discharge pipe to seal the oil discharge pipe and prevent grease from leaking from the oil discharge pipe, further improving the sealing effect of the sealing structure and reducing oil leakage.
[0024] (3) A notch is provided on one side of the lower end of the inner ring of the present utility model close to the rotating ring, and a second sealing unit is arranged at the notch to seal the bottom of the second gap. Cooperating with the labyrinth sealing unit, a double sealing effect is achieved. And the second sealing unit is rotatably connected to the rotating ring, which not only ensures the sealing performance but also does not affect the normal rotation of the output shaft of the speed reducer.
[0025] (4) The axial cross-sections of the outer ring fixedly installed on the outer peripheral surface of the rotating ring and rotatably connected to the stationary ring and the inner ring fixedly installed on the inner peripheral surface of the stationary ring and rotatably connected to the rotating ring of the labyrinth sealing unit of the present utility model are both L-shaped surfaces, and the two are staggered and buckled to form a labyrinth structure. The third gap left between the outer ring and the inner ring has a special throttling effect. When grease attempts to pass through these tortuous third gaps, a throttling effect will be generated, thereby achieving the purpose of leakage prevention. It can not only ensure that the output shaft is fully lubricated and rotates normally but also ensure good sealing performance, thereby guaranteeing the normal operation of the speed reducer during vertical installation, reducing oil leakage, improving the surrounding environment, and reducing the maintenance cost.
[0026] (5) The bottom of the outer ring of the present utility model extends downward to the inner pipe orifice of the oil discharge pipe, so that one end gap orifice of the third gap corresponds and communicates with the lower half part of the inner pipe orifice of the oil discharge pipe. Such a design can not only guide the excess grease to a safe area to avoid leakage caused by accumulation but also effectively seal the area between the outer ring and the oil discharge pipe to prevent a large amount of grease from leaking through this gap.
[0027] (6) The first sealing unit of the present utility model adopts a plurality of skeleton oil seals. The plurality of skeleton oil seals are stacked axially in the first gap between the flange and the output shaft to provide multiple sealing guarantees, enhance the sealing effect, and effectively prevent grease from leaking out of the gap between the flange and the output shaft.
[0028] (7) The sealing structure of the present utility model can significantly improve the sealing effect, and the sealing effect can reach twice (i.e., 200%) of the original. This not only ensures the normal operation of the reducer during vertical installation, but also greatly reduces the oil leakage phenomenon, effectively improves the surrounding environment, and significantly reduces the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments in conjunction with the drawings, where
[0030] Figure 1 is a schematic structural diagram of the sealing structure of the output shaft of the reducer of the present utility model.
[0031] The reference numerals in the drawings are: the first sealing unit 1, the flange 2, the static ring 3, the oil discharge pipe 3-1, the inner ring 3-2, the dynamic ring 4, the outer ring 4-1, the output shaft 5, the second sealing unit 6, the screw 7, the bolt 8, the reducer 9. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0032] In order to better understand the above technical solutions, the following will detail the above technical solutions in conjunction with the drawings of the specification and specific embodiments.
[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.
[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0036] In the description of the embodiments of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the utility model product is customarily placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model.
[0037] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The present utility model will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model. Embodiment
[0038] See Figure 1, A sealing structure for the output shaft of a speed reducer, used to seal the gap between the sealing flange 2 and the output shaft 5, including a stationary ring 3, a rotating ring 4, a first sealing unit 1, and a labyrinth sealing unit; wherein, the flange 2 is coaxially sleeved outside the output shaft 5, and the flange 2 is fixedly installed on the speed reducer 9 through bolts 8. There is a first gap between the flange 2 and the output shaft 5. The first sealing unit 1 is arranged in the first gap to seal the first gap. The first sealing unit 1 is fixedly connected to the flange 2 and rotatably connected to the output shaft 5, which can effectively prevent grease from leaking out of the gap between the flange and the output shaft under the condition of ensuring the normal operation of the output shaft; the rotating ring 4 is coaxially sleeved outside the output shaft 5 and fixedly connected to the output shaft 5; the stationary ring 3 is sleeved outside the rotating ring 4 and rotatably connected to the rotating ring 4. The upper end of the stationary ring 3 is fixedly connected to the lower end of the flange 2 through screws 7. There is a second gap between the stationary ring 3 and the rotating ring 4. The labyrinth sealing unit is arranged inside the second gap to seal the second gap. There are 2 drain pipes 3-1 communicating with the first gap near the lower end of the stationary ring 3, and the labyrinth sealing unit is arranged at the inner pipe orifice of the drain pipes 3-1; the labyrinth sealing unit includes an outer ring 4-1 and an inner ring 3-2. The outer ring 4-1 is fixedly installed on the outer peripheral surface of the rotating ring 4 in an inverted L shape, and the inner ring 3-2 is fixedly installed on the inner peripheral surface of the stationary ring 3 in an L shape. The part of the outer ring 4-1 parallel to the output shaft extends axially between the inner ring 3-2 and the stationary ring 3, and the part of the inner ring 3-2 parallel to the output shaft extends axially between the outer ring 4-1 and the rotating ring 4. There is a third gap between the outer ring 4-1 and the inner ring 3-2. The bottom of the outer ring 4-1 extends downward to the inner pipe orifice of the drain pipe 3-1, and one end gap orifice of the third gap corresponds to and communicates with the lower half part of the inner pipe orifice of the drain pipe 3-1; when grease attempts to pass through these tortuous third gaps, a throttling effect will be generated, thereby achieving the purpose of leakage prevention. It can not only ensure that the output shaft is fully lubricated and rotates normally, but also ensure good sealing effect, thereby ensuring the normal operation of the speed reducer during vertical installation, reducing oil leakage, improving the surrounding environment, and reducing maintenance costs; wherein, grease is filled in the first gap, the second gap, and the third gap.
[0039] In a further embodiment, there is a notch on the side of the lower end of the inner ring 3-2 close to the rotating ring 4. A second sealing unit 6 is arranged at the notch. The second sealing unit 6 is fixedly installed on the inner ring 3-2 and rotatably connected to the rotating ring 4; it is used to seal the bottom of the second gap and cooperate with the labyrinth sealing unit to achieve a double sealing effect; and the second sealing unit is rotatably connected to the rotating ring, which not only ensures the sealing performance but also does not affect the normal rotation of the output shaft of the speed reducer.
[0040] In a further embodiment, the first sealing unit 1 employs a plurality of skeleton oil seals. In this embodiment, preferably two skeleton oil seals are used. The two skeleton oil seals are stacked axially in the first gap between the flange 2 and the output shaft 5 to provide multiple sealing safeguards, enhancing the sealing effect and effectively preventing grease from leaking out through the gap between the flange and the output shaft.
[0041] In a further embodiment, the second sealing unit 6 employs one skeleton oil seal.
[0042] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A sealing structure for the output shaft of a speed reducer, used for the gap between the sealing flange (2) and the output shaft (5), characterized in that, It includes a stationary ring (3), a rotating ring (4), a first sealing unit (1), and a labyrinth sealing unit; the flange (2) is coaxially sleeved outside the output shaft (5) and fixedly installed on the speed reducer. There is a first gap between the flange (2) and the output shaft (5). The first sealing unit (1) is arranged in the first gap. The first sealing unit (1) is fixedly connected to the flange (2) and rotatably connected to the output shaft (5); the rotating ring (4) is coaxially sleeved outside the output shaft (5) and fixedly connected to the output shaft (5); the stationary ring (3) is sleeved outside the rotating ring (4) and rotatably connected to the rotating ring (4). The upper end of the stationary ring (3) is fixedly connected to the lower end of the flange (2). There is a second gap between the stationary ring (3) and the rotating ring (4). The labyrinth sealing unit is arranged inside the second gap to seal the second gap.
2. The sealing structure of the output shaft of the speed reducer according to claim 1, characterized in that, Near the lower end of the stationary ring (3), there are a plurality of oil drain pipes (3-1) communicating with the first gap. A labyrinth sealing unit is arranged at the inner pipe orifice of the oil drain pipe (3-1).
3. The sealing structure of the output shaft of the speed reducer according to any one of claims 1 or 2, characterized in that, The labyrinth sealing unit includes an outer ring (4-1) and an inner ring (3-2). The outer ring (4-1) is fixedly installed on the outer peripheral surface of the rotating ring (4) in an inverted L shape. The inner ring (3-2) is fixedly installed on the inner peripheral surface of the stationary ring (3) in an L shape. The part of the outer ring (4-1) parallel to the output shaft extends axially between the inner ring (3-2) and the stationary ring (3). The part of the inner ring (3-2) parallel to the output shaft extends axially between the outer ring (4-1) and the rotating ring (4). There is a third gap between the outer ring (4-1) and the inner ring (3-2).
4. The sealing structure of the output shaft of the speed reducer according to claim 3, characterized in that, The bottom of the outer ring (4-1) extends downward to the inner pipe orifice of the oil drain pipe (3-1). One end of the third gap corresponds to and communicates with the lower half part of the inner pipe orifice of the oil drain pipe (3-1).
5. The sealing structure of the output shaft of the speed reducer according to claim 3, characterized in that, Near the lower end of the inner ring (3-2) and on the side close to the rotating ring (4), there is a notch. A second sealing unit (6) is arranged at the notch. The second sealing unit (6) is fixedly installed on the inner ring (3-2) and rotatably connected to the rotating ring (4).
6. The sealing structure of the output shaft of the speed reducer according to claim 5, characterized in that, The second sealing unit (6) adopts a skeleton seal.
7. The sealing structure of the output shaft of the speed reducer according to claim 1, characterized in that, The first sealing unit (1) adopts a plurality of skeleton oil seals. The plurality of skeleton oil seals are stacked axially in the first gap between the flange (2) and the output shaft (5).