Sealing mechanism for vertical reduction gearbox and vertical reduction gearbox

Abstract

The sealing mechanism is located at the top of an output hollow shaft of the reduction gearbox, and a containing space used for installing an upper bearing is formed between the outer side wall of the output hollow shaft and the inner side wall of a bearing seat. The sealing mechanism comprises an upper sealing ring arranged in the containing space and located above the upper bearing and a lower sealing ring located below the second bearing, the outer side wall of the upper sealing ring is fixedly connected with the bearing seat in a sealed mode, and an annular groove is coaxially formed in the lower surface of the upper sealing ring. A first sealing ring is arranged between the lower surface of the upper sealing ring and the top end of the inner ring of the upper bearing, so that a first lubricating cavity communicated with the annular groove is formed between the upper sealing ring and the top end of the inner ring, the inner side wall of the lower sealing ring is fixedly and hermetically connected with the outer side wall of the output hollow shaft, and the outer side wall of the lower sealing ring is hermetically connected with the inner side wall of the bearing seat; the upper bearing outer ring and lower bearing outer ring sealing structure disclosed by the utility model is good in sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of vertical reduction box sealing, in particular to a sealing mechanism for a vertical reduction box and the vertical reduction box. Background Art

[0002] The vertical reducer is a key power transmission device. The vertical reducer includes a vertically arranged output main shaft and a horizontally arranged input shaft. The input shaft is fixedly provided with an input bevel gear, and the output main shaft fixing sleeve is provided with an output hollow shaft. The output hollow shaft has an output bevel gear meshing with the input bevel gear. During the operation of the vertical reducer, its internal lubrication and sealing are particularly critical. At present, the bottom seal of the vertical reducer is prone to oil leakage under the action of pressure; at the same time, the top lubrication of the vertical reducer is also difficult, and generally requires connecting an oil pump and relying on forced lubrication, but the structure is relatively complicated, and some working conditions do not have external forced lubrication conditions. For the vertical transmission reducer with hollow shaft output, the use of forced lubrication will cause the lubricating oil to leak into the inside of the hollow shaft, thereby contaminating the output main shaft. Utility Model Content

[0003] In order to solve the problem in the prior art that forced lubrication is used in vertical reduction gearboxes, which causes lubricating oil to leak into the interior of the output hollow shaft, the utility model provides a sealing mechanism for a vertical reduction gearbox and a vertical reduction gearbox, which have good sealing effect, can prevent lubricating oil from leaking into the output hollow shaft, and extend the service life of the output hollow shaft.

[0004] In order to achieve the above-mentioned purpose, the specific scheme adopted by the utility model is: a sealing mechanism for a vertical reducer, the sealing mechanism is located at the top of the output hollow shaft of the reducer, and there is an accommodating space for installing the upper bearing between the outer side wall of the output hollow shaft and the inner side wall of the bearing seat, the sealing mechanism includes an upper sealing ring arranged in the accommodating space and located above the upper bearing and a lower sealing ring located below the second bearing, the outer side wall of the upper sealing ring is fixedly sealed and connected to the bearing seat, an annular groove is coaxially opened on the lower surface of the upper sealing ring, and a first sealing ring is arranged between the lower surface of the upper sealing ring and the top of the inner ring of the upper bearing, so that a first lubrication cavity connected to the annular groove is formed between the upper sealing ring and the top of the inner ring, the inner side wall of the lower sealing ring is fixedly sealed and connected to the outer side wall of the output hollow shaft, and the outer side wall of the lower sealing ring is sealed and connected to the inner side wall of the bearing seat, so that a second lubrication cavity connected to the first lubrication cavity is formed between the lower sealing ring and the outer ring of the upper bearing.

[0005] As an optimization solution for the sealing mechanism of the above-mentioned vertical reduction gearbox: the top end of the upper bearing outer ring is higher than the top end of the inner ring, and the bottom end of the upper bearing outer ring is lower than the bottom end of the inner ring.

[0006] As another optimization solution for the sealing mechanism of the vertical reduction gearbox, an oil inlet channel connected to the second lubrication chamber is provided on the bearing seat, and a first oil filling cup is provided at one end of the oil inlet channel facing the outside of the reduction gearbox.

[0007] As another optimization solution for the sealing mechanism of the vertical reduction gearbox, a second sealing ring is provided between the outer side wall of the lower sealing ring and the inner side wall of the bearing seat.

[0008] A vertical reduction gearbox includes a shell with a bearing seat at the top and a bearing end cover at the bottom. An input shaft and an output main shaft perpendicular to each other are arranged in the shell. An output hollow shaft is fixedly sleeved on the output main shaft and is transmission-connected to the input shaft. The top of the output hollow shaft is connected to the bearing seat through an upper bearing. The top of the output hollow shaft is provided with the above-mentioned sealing mechanism.

[0009] As an optimization solution for the above-mentioned vertical reduction gearbox: the top end of the output hollow shaft is flush with the top end of the output main shaft, and the top end of the output hollow shaft is fixedly and sealedly connected to a pressure plate.

[0010] As another optimization solution of the above-mentioned vertical reduction gearbox: a mounting hole coaxial with the output hollow shaft is provided at the bottom end of the housing, and a lower bearing for connecting the output hollow shaft and the housing is provided in the mounting hole.

[0011] As another optimization solution for the above-mentioned vertical reducer: the bottom wall of the shell is fixedly connected to an annular baffle coaxial with the output hollow shaft, and an annular oil storage chamber is formed between the inner wall of the annular baffle and the outer wall of the output hollow shaft, and the outer diameter of the annular oil storage chamber is larger than the diameter of the mounting hole.

[0012] As another optimization solution for the above-mentioned vertical reducer: an oil supply pipe is provided on the shell, one end of the oil supply pipe is connected to the bottom of the annular oil storage cavity, and the other end of the oil supply pipe extends out of the shell and is provided with a second oil filling cup.

[0013] As another optimization solution for the above-mentioned vertical reducer: the center position of the bearing end cover has a through-hole for the output hollow shaft to pass through, the bottom of the through-hole passes through the through-hole, and an oil retaining ring is fixedly connected around the outer wall of the output hollow shaft, and a labyrinth seal is formed between the outer wall of the oil retaining ring and the inner wall of the through-hole.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The utility model provides a sealing mechanism for a vertical reduction gearbox, wherein an upper sealing ring is arranged above the upper bearing, and the lower surface of the upper sealing ring is sealedly connected to the top of the inner ring of the upper bearing to form a first lubrication cavity with a closed upper end, and a lower sealing ring is arranged below the upper bearing, the outer side wall of the lower sealing ring is sealedly connected to the outer side wall of the bearing seat, and the inner side wall of the lower sealing ring is sealedly connected to the outer side wall of the output hollow shaft, so that a second lubrication cavity with a closed bottom end and a top end connected to the first lubrication cavity is formed between the lower sealing ring and the upper bearing, with a good sealing effect, which can prevent the lubricating oil from leaking into the output hollow shaft, thereby extending the service life of the output hollow shaft.

[0016] 2. The utility model provides a vertical reduction gearbox, in which an independent annular oil storage chamber is formed between the annular baffle and the output hollow shaft. The lubricating oil of the lower bearing is located in the annular oil storage chamber, thereby preventing the lubricating oil from leaking into the interior of the reduction gearbox.

[0017] 3. In the present invention, the labyrinth seal and the upper sealing ring are provided to prevent external impurities from entering the interior of the reduction gearbox, thereby protecting key components inside the reduction gearbox from damage and effectively improving the reliability of the vertical reduction gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the reduction gearbox in the present utility model;

[0019] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0020] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle;

[0021] Figure 4 Schematic diagram of the reduction gearbox structure provided with a seal;

[0022] Figure numerals: 1. housing, 2. bearing seat, 3. output hollow shaft, 4. first sealing ring, 5. pressure plate, 6. output main shaft, 7. upper sealing ring, 701, annular groove, 8. upper bearing, 9. first oil filling cup, 10. lower sealing ring, 11. second sealing ring, 12. annular baffle, 1201, oil supply pipe, 13. bearing end cover, 14. oil retaining ring, 15. lower bearing, 16. second oil filling cup, 17. second lubrication chamber, 18. oil channel, 19. first lubrication chamber, 20. input shaft, 21. seal. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further elaborated in detail below in conjunction with specific embodiments. The parts that are not described and disclosed in detail in the following embodiments of the present invention should be understood as existing technologies that are known or should be known to those skilled in the art, such as the structure of the bearing seat 2, the structure of the bearing end cover 13, how the output hollow shaft 3 is installed on the output main shaft 6, and the installation method of the bearing end cover 13.

[0024] Example 1

[0025] A sealing mechanism for a vertical reducer, the sealing mechanism is located at the top of the output hollow shaft 3 of the reducer, and an accommodating space for installing an upper bearing 8 is provided between the outer wall of the output hollow shaft 3 and the inner wall of the bearing seat 2. In this embodiment, the top of the outer ring of the upper bearing 8 is higher than the top of the inner ring, and the bottom end of the outer ring of the upper bearing 8 is lower than the bottom end of the inner ring, and the sealing mechanism is located in the accommodating space, which improves the sealing performance of the top of the output hollow shaft 3, prevents lubricating oil from entering the inner cavity of the output hollow shaft 3, and extends the service life of the output hollow shaft 3 and the output main shaft 6.

[0026] The sealing mechanism includes an upper sealing ring 7 arranged in the accommodating space and located above the upper bearing 8, and a lower sealing ring 10 located below the second bearing. The outer wall of the upper sealing ring 7 is fixedly sealed and connected to the bearing seat 2. The connection between the two is an interference fit to prevent the lubricating oil from leaking out from between the outer wall of the upper sealing ring 7 and the inner wall of the bearing seat 2; there is a movable margin between the inner wall of the upper sealing ring 7 and the outer wall of the output hollow shaft 3 for the output hollow shaft 3 to rotate; an annular groove 701 is coaxially opened on the lower surface of the upper sealing ring 7, and a first sealing ring is provided between the lower surface of the upper sealing ring 7 and the top of the inner ring of the upper bearing 8. The sealing ring 4 forms a first lubrication cavity 19 between the upper sealing ring 7 and the top of the inner ring, which is connected to the annular groove 701. Specifically, the lower part of the upper sealing ring 7 is cut by the annular groove 701 to form a first annular portion and a second annular portion. The first annular portion is close to the axis of the upper sealing ring 7, and the second annular portion is away from the axis of the upper sealing ring 7. In this embodiment, the horizontal position of the bottom end of the first annular portion is lower than the horizontal position of the bottom end of the second annular portion, and the first sealing ring 4 is located between the first annular portion and the top of the inner ring of the upper bearing 8, so as to prevent the lubricating oil from leaking out from between the lower surface of the upper sealing ring 7 and the end face of the upper bearing 8.

[0027] The inner sidewall of the lower sealing ring 10 is fixedly sealed to the outer sidewall of the output hollow shaft 3, preventing lubricating oil from leaking out from between the inner sidewall of the lower sealing ring 10 and the outer sidewall of the output hollow shaft 3. The outer sidewall of the lower sealing ring 10 is sealed to the inner sidewall of the bearing seat 2, forming a second lubricating cavity 17 between the lower sealing ring 10 and the outer ring of the upper bearing 8, which is connected to the first lubricating cavity 19. In this embodiment, a second sealing ring 11 is provided between the outer sidewall of the lower sealing ring 10 and the inner sidewall of the bearing seat 2 to prevent lubricating oil from leaking out from between the outer sidewall of the lower sealing ring 10 and the inner sidewall of the bearing seat 2. The lubricating oil is located between the upper sealing ring 7 and the lower sealing ring 10, which improves the sealing performance of the top of the reduction gearbox, prevents lubricating oil from leaking into the output hollow shaft 3, and extends the service life of the output hollow shaft 3.

[0028] An oil inlet passage 18 is formed on the bearing housing 2, communicating with the second lubrication chamber 17. A first oil filling cup 9 is disposed at the end of the oil inlet passage 18 facing the exterior of the reduction gearbox. In this embodiment, there are two oil inlet passages 18, symmetrically arranged along the axis of the upper bearing 8. The oil inlet passage 18 comprises a vertical portion and a horizontal portion that are interconnected. The top of the vertical portion extends to the upper end surface of the bearing housing 2, the bottom of the vertical portion communicates with one end of the horizontal portion, and the end of the horizontal portion, remote from the vertical portion, communicates with the second lubrication chamber 17. The first oil filling cup 9 is located at the top of the vertical portion, supplying lubricating oil to both the second lubrication chamber 17 and the first lubrication chamber 19.

[0029] Example 2

[0030] like Figure 1 As shown, a vertical reduction gearbox includes a housing 1 with a bearing seat 2 at the top and a bearing end cover 13 at the bottom. The top plate of the housing 1 is provided with a through hole, and the bearing seat 2 is located at the through hole and is fixedly connected to the housing 1. The two are connected by bolts. An input shaft 20 and an output main shaft 6 are arranged perpendicular to each other in the housing 1. An output hollow shaft 3 is fixedly sleeved on the output main shaft 6 and is transmission-connected to the input shaft 20. In this embodiment, the input shaft 20 is arranged horizontally, and one end of the input shaft 20 extends out of the housing 1. The other end of the input shaft 20 is coaxially fixedly connected to a driving bevel gear; the output main shaft 6 and the output hollow shaft 3 are arranged vertically, and the outer wall of the output hollow shaft 3 is coaxially fixedly connected to a driven bevel gear that meshes with the driving bevel gear. The driving bevel gear and the driven bevel gear cooperate to realize the transmission between the input shaft 20 and the output hollow shaft 3. A stepped hole is provided on the bearing seat 2, and the small-diameter hole is located above the large-diameter hole, so that the bearing seat 2 has a stepped surface facing the inner cavity of the shell 1; the top end of the output main shaft 6 of the output hollow shaft 3 extends into the stepped hole and is flush with the step surface, and the accommodating space described in Example 1 is formed between the inner wall of the large-diameter hole and the outer wall of the output hollow shaft 3.

[0031] The top of the output hollow shaft 3 is connected to the bearing seat 2 through the upper bearing 8. The top of the output hollow shaft 3 is provided with the sealing mechanism described in Example 1. The upper bearing 8 and the sealing mechanism are both located in the accommodation space.

[0032] An annular member extending toward the outside of the housing 1 is coaxially fixedly connected to the upper end surface of the bearing seat 2 , and a sealing plate for closing the stepped hole is fixedly connected to the free end of the annular member.

[0033] Example 3

[0034] This embodiment is an improved scheme for a vertical reducer based on Example 2. Its main structure is the same as that of Example 2, and the improvements are: the top end of the output hollow shaft 3 is flush with the top end of the output main shaft 6, and the top end of the output hollow shaft 3 is fixedly and sealedly connected with a pressure plate 5. The pressure plate 5 is a circular plate structure, and the diameter of the pressure plate 5 is equal to the outer diameter of the output hollow shaft 3. The pressure plate 5 is fixedly and sealedly connected to the top end of the output hollow shaft 3, and the connection between the two is a bolt connection, which further prevents lubricating oil from entering the inner cavity of the output hollow shaft 3 and improves the service life of the output hollow shaft 3 and the output main shaft 6.

[0035] Example 4

[0036] This embodiment is an improved vertical reduction gearbox based on Embodiment 2. Its main structure is the same as that of Embodiment 2, with the following improvements: a mounting hole coaxial with the output hollow shaft 3 is defined at the bottom end of the housing 1. The mounting hole has a diameter larger than the outer diameter of the output hollow shaft 3. The bottom end of the output hollow shaft 3 extends through the mounting hole to the outside of the housing 1. A lower bearing 15 is disposed within the mounting hole for connecting the output hollow shaft 3 to the housing 1. Specifically, the outer ring of the lower bearing 15 has an interference fit with the mounting hole, while the inner ring of the lower bearing 15 has an interference fit with the output hollow shaft 3. An annular baffle 12 coaxial with the output hollow shaft 3 is fixedly connected to the bottom wall of the housing 1. The annular baffle 12 is located above the upper bearing 8, and the bottom end of the annular baffle 12 is fixedly and sealedly connected to the bottom wall of the housing 1. The inner diameter of the annular baffle 12 is larger than the diameter of the mounting hole, and the height of the annular baffle 12 cannot exceed the lowest edge of the driven bevel gear on the output hollow shaft 3, ensuring the normal operation of the output hollow shaft 3. An annular oil reservoir is formed between the inner wall of the annular baffle 12 and the outer wall of the output hollow shaft 3. A horizontal oil supply pipe 1201 is provided on the housing 1. One end of the oil supply pipe 1201 is connected to the bottom of the annular oil reservoir. The other end of the oil supply pipe 1201 extends out of the housing 1 and is provided with a second oil filling cup 16 for injecting lubricating oil into the annular oil reservoir. The annular baffle 12 confines the lubricating oil within the annular oil reservoir, preventing it from leaking outside the housing 1 and affecting the service life of the input shaft 20, the driving bevel gear, and the driven bevel gear.

[0037] The center position of the bearing end cover 13 has a through hole for the output hollow shaft 3 to pass through. The bottom of the through hole of the output hollow shaft 3 passes through the through hole, and an oil retaining ring 14 is fixedly connected around the outer wall of the output hollow shaft 3. A labyrinth seal is formed between the outer wall of the oil retaining ring 14 and the inner wall of the through hole to prevent lubricating oil from leaking from the bottom of the housing 1.

[0038] In other embodiments, the seal between the bearing end cover 13 and the output hollow shaft 3 may also be provided by providing a seal 21 in the through hole, such as Figure 4 shown.

[0039] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sealing mechanism for a vertical reduction gearbox, wherein the sealing mechanism is located at the top of the output hollow shaft (3) of the reduction gearbox, and an accommodating space for installing an upper bearing (8) is provided between the outer wall of the output hollow shaft (3) and the inner wall of the bearing seat (2), and the sealing mechanism is characterized in that: The sealing mechanism comprises an upper sealing ring (7) arranged in the accommodating space and located above the upper bearing (8) and a lower sealing ring (10) located below the second bearing, the outer wall of the upper sealing ring (7) is fixedly sealed and connected to the bearing seat (2), the lower surface of the upper sealing ring (7) is coaxially provided with an annular groove (701), and a first sealing ring (4) is arranged between the lower surface of the upper sealing ring (7) and the top end of the inner ring of the upper bearing (8), so that a first lubrication cavity (19) communicating with the annular groove (701) is formed between the upper sealing ring (7) and the top end of the inner ring, the inner wall of the lower sealing ring (10) is fixedly sealed and connected to the outer wall of the output hollow shaft (3), the outer wall of the lower sealing ring (10) is sealed and connected to the inner wall of the bearing seat (2), so that a second lubrication cavity (17) communicating with the first lubrication cavity (19) is formed between the lower sealing ring (10) and the outer ring of the upper bearing (8).

2. The sealing mechanism for a vertical reduction gearbox according to claim 1, characterized in that: The top end of the outer ring of the upper bearing (8) is higher than the top end of the inner ring, and the bottom end of the outer ring of the upper bearing (8) is lower than the bottom end of the inner ring.

3. The sealing mechanism for a vertical reduction gearbox according to claim 1, characterized in that: The bearing seat (2) is provided with an oil inlet passage (18) communicating with the second lubrication cavity (17), and a first oil filling cup (9) is provided at one end of the oil inlet passage (18) facing the outside of the gear box.

4. The sealing mechanism for a vertical reduction gearbox according to claim 1, wherein: A second sealing ring (11) is provided between the outer side wall of the lower sealing ring (10) and the inner side wall of the bearing seat (2).

5. A vertical reduction gearbox, comprising a housing (1) with a bearing seat (2) at the top and a bearing end cover (13) at the bottom, wherein an input shaft (20) and an output main shaft (6) are arranged perpendicular to each other in the housing (1), an output hollow shaft (3) is fixedly sleeved on the output main shaft (6) and is transmission-connected to the input shaft (20), and the top of the output hollow shaft (3) is connected to the bearing seat (2) through an upper bearing (8), characterized in that: The top of the output hollow shaft (3) is provided with a sealing mechanism according to any one of claims 1 to 4.

6. A vertical reduction gearbox according to claim 5, characterized in that: The top end of the output hollow shaft (3) is flush with the top end of the output main shaft (6), and the top end of the output hollow shaft (3) is fixedly and sealedly connected to a pressure plate (5).

7. The vertical reduction gearbox according to claim 5, characterized in that: The bottom end of the housing (1) is provided with a mounting hole coaxial with the output hollow shaft (3), and a lower bearing (15) for connecting the output hollow shaft (3) and the housing (1) is provided in the mounting hole.

8. A vertical reduction gearbox according to claim 7, characterized in that: An annular baffle (12) coaxial with the output hollow shaft (3) is fixedly connected to the bottom wall of the housing (1); an annular oil storage cavity is formed between the inner side wall of the annular baffle (12) and the outer side wall of the output hollow shaft (3); and the outer diameter of the annular oil storage cavity is greater than the diameter of the mounting hole.

9. A vertical reduction gearbox according to claim 8, characterized in that: An oil supply pipe (1201) is provided on the housing (1), one end of the oil supply pipe (1201) is connected to the bottom of the annular oil storage cavity, and the other end of the oil supply pipe (1201) extends out of the housing (1) and is provided with a second oil filling cup (16).

10. The vertical reduction gearbox according to claim 5, characterized in that: The center position of the bearing end cover (13) is provided with a through hole for the output hollow shaft (3) to pass through, the bottom of the through hole of the output hollow shaft (3) passes through the through hole, and an oil retaining ring (14) is fixedly connected around the outer wall of the output hollow shaft (3), and a labyrinth seal is formed between the outer wall of the oil retaining ring (14) and the inner wall of the through hole.

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