Sealing device for transmission equipment and speed reducer

Abstract

The sealing device for the transmission equipment comprises a bearing assembly and a sealing assembly, the bearing assembly comprises a bearing seat and a first bearing, the bearing seat is provided with a bearing installation hole, and the first bearing is arranged at a first port of the bearing installation hole and allows a transmission main shaft to penetrate through in a rotatable mode. A grease storage cavity is defined by the transmission main shaft and the inner wall of the bearing mounting hole, the grease storage cavity is located on the axial inner side of the first bearing, the sealing assembly comprises a sealing cover and a baffle ring which are sequentially arranged on the transmission main shaft in a sleeving mode from the axial outer side of the first bearing, and the side, away from the sealing cover, of the baffle ring is used for abutting against the transmission main shaft; and the sealing cover and the baffle ring are axially positioned by taking the transmission main shaft as a reference, so that the condition of unbalance loading of a sealing surface can be avoided, and the sealing reliability of transmission equipment is effectively ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission equipment, and specifically relates to a sealing device and a reducer for transmission equipment. Background Art

[0002] The transmission shaft of the reducer is provided with upper and lower bearings. Usually, the upper bearing is arranged near the input end of the transmission shaft and uses lubricating oil for lubrication and cooling, and the lower bearing is arranged near the output end of the transmission shaft and uses grease for lubrication and cooling. In order to prevent the lubricating oil or grease from leaking out of the reducer and dust from entering the reducer, a corresponding sealing structure needs to be provided. CN101832385A discloses a lower shaft sealing device for a vertical reducer, in which a spacer sleeve is provided on the output end of the transmission shaft, and an oil seal and a V-ring are provided on the housing of the reducer. The inner rings of the oil seal and the V-ring are sealed and spliced ​​with the spacer sleeve to achieve oil blocking and dust prevention respectively. Since the oil seal and the V-ring are both arranged on the housing, the processing accuracy of the housing and the matching accuracy of the housing and the shaft are required to be high. In the actual manufacturing process, it is easy to cause the oil seal and the V-ring to be overloaded due to improper processing or assembly, thereby causing grease leakage and dust to enter the bearing. Utility Model Content

[0003] In view of the above-mentioned defects or shortcomings, the utility model provides a sealing device and a reducer for transmission equipment, aiming to solve the technical problems that the existing sealing structure is limited by the manufacturing and assembly accuracy, which easily leads to lubricant leakage and dust entering the bearing.

[0004] To achieve the above-mentioned purpose, the utility model provides a sealing device for transmission equipment, wherein the sealing device for transmission equipment includes a bearing assembly and a sealing assembly, the bearing assembly includes a bearing seat and a first bearing, the bearing seat has a bearing mounting hole, the first bearing is arranged at the first port of the bearing mounting hole and can be rotatably passed through the transmission main shaft, and the transmission main shaft and the inner wall of the bearing mounting hole are surrounded to form a grease storage cavity, and the grease storage cavity is located on the axial inner side of the first bearing, the sealing assembly includes a sealing cover and a retaining ring which are sequentially sleeved on the transmission main shaft from the axial outer side of the first bearing, and the side of the retaining ring facing away from the sealing cover is used to abut against the transmission main shaft so as to press the sealing cover onto the first bearing.

[0005] In the embodiment of the utility model, a lubricant accommodating cavity is formed on a side of the sealing cover facing the first bearing, and the lubricant accommodating cavity is communicated with the roller channel of the first bearing.

[0006] In an embodiment of the utility model, the sealing cover includes a clamping part and a chamber sealing part which are arranged in sequence from the inside to the outside. The clamping part is clamped between the inner ring and the retaining ring of the first bearing. The chamber sealing part covers the roller channel of the first bearing and forms a lubricant containing chamber.

[0007] In an embodiment of the utility model, the pressing portion and the chamber sealing portion are formed by integrally bending a metal plate.

[0008] In an embodiment of the utility model, the chamber sealing portion includes a first bending section, a straight section and a second bending section which are arranged in sequence from the clamping portion to the outside. The first bending section is bent from the clamping portion and extends obliquely in a direction away from the first bearing. The straight section extends horizontally outward from the outer end of the first bending section. The second bending section is bent from the outer end of the straight section toward the outer ring of the first bearing.

[0009] In an embodiment of the utility model, the sealing cover further comprises an elastic sealing member provided at one end of the chamber sealing portion away from the pressing portion, and the elastic sealing member is sealed and pressed against the outer ring of the first bearing;

[0010] Alternatively, an axial gap is formed between an end of the chamber sealing portion away from the pressing portion and the outer ring of the first bearing.

[0011] In an embodiment of the utility model, the bearing assembly also includes a second bearing, which is arranged at the second port of the bearing mounting hole and can allow the transmission main shaft to rotatably pass through it. The sealing assembly also includes a dynamic seal that is sleeved on the outer side of the transmission main shaft. The dynamic seal is located between the first bearing and the second bearing and can allow the transmission main shaft to be relatively rotatable.

[0012] In an embodiment of the utility model, a sealing stop portion is protruded on the inner wall of the bearing mounting hole, a grease storage cavity is provided between the sealing stop portion and the first bearing, and the side of the sealing stop portion facing the second bearing is used for abutting and limiting the dynamic seal.

[0013] In the embodiment of the utility model, a filling port for filling lubricant is arranged on the outer wall of the bearing seat, and the filling port is connected to the grease storage cavity.

[0014] In order to achieve the above-mentioned object, the utility model further provides a speed reducer, wherein the speed reducer comprises a transmission main shaft and the sealing device for the transmission equipment, and a step portion abutting against the retaining ring is formed on the transmission main shaft.

[0015] Through the above technical solution, the sealing device for transmission equipment and the reducer provided by the embodiment of the utility model have the following beneficial effects:

[0016] When the above-mentioned sealing device for transmission equipment is used, the transmission main shaft can be rotatably passed through the first bearing, and the bearing seat is formed with a grease storage cavity on the axial inner side of the first bearing. Excess lubricant can be stored in the grease storage cavity, and a sealing assembly is correspondingly arranged on the axial outer side of the first bearing to prevent the lubricant from overflowing from the transmission equipment. The sealing assembly includes a sealing cover and a retaining ring which are sleeved on the transmission main shaft. The retaining ring abuts against the transmission main shaft and presses the sealing cover onto the first bearing. The sealing cover and the retaining ring are based on the transmission main shaft and are axially positioned to avoid unbalanced loading of the sealing surface, thereby effectively ensuring the reliability of the transmission equipment sealing.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of a sealing device for a transmission device according to an embodiment of the utility model;

[0020] Figure 2 It is a partial schematic diagram of a sealing cover according to an embodiment of the utility model;

[0021] Figure 3 It is a partial schematic diagram of a bearing seat in one embodiment of the utility model.

[0022] Description of Reference Numerals

[0023] 1 bearing assembly 11 bearing seat

[0024] 111 Grease storage chamber 112 Sealing stopper

[0025] 12 First bearing 121 Roller channel

[0026] 13 Second bearing 14 Filling port

[0027] 2 Sealing assembly 21 Sealing cover

[0028] 211: pressing part 212: chamber sealing part

[0029] 213 First bending section 214 Straight section

[0030] 215 second bending section 216 lubricant containing chamber

[0031] 217 elastic seal 22 retaining ring

[0032] 23 Dynamic seal 24 O-ring

[0033] 3 Transmission main shaft 31 Step part

[0034] 32 Undercut groove 4 Box DETAILED DESCRIPTION

[0035] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] The sealing device for transmission equipment and the reducer of the utility model are described below with reference to the accompanying drawings.

[0037] like Figure 1 and Figure 2 As shown, the utility model provides a sealing device for transmission equipment, wherein the sealing device for transmission equipment comprises:

[0038] The bearing assembly 1 comprises a bearing seat 11 and a first bearing 12. The bearing seat 11 has a bearing mounting hole. The first bearing 12 is arranged at a first end of the bearing mounting hole and can be rotatably passed through by the transmission main shaft 3. The transmission main shaft 3 and the inner wall of the bearing mounting hole enclose a grease storage cavity 111, and the grease storage cavity 111 is located axially inward of the first bearing 12.

[0039] The sealing assembly 2 includes a sealing cover 21 and a retaining ring 22 which are sequentially sleeved on the transmission main shaft 3 from the axial outer side of the first bearing 12. The side of the retaining ring 22 facing away from the sealing cover 21 is used to abut against the transmission main shaft 3 to press the sealing cover 21 onto the first bearing 12.

[0040] When the above-mentioned sealing device for transmission equipment is used, the transmission main shaft 3 can be rotatably passed through the first bearing 12, and the bearing seat 11 forms a grease storage cavity 111 on the axial inner side of the first bearing 12, and the excess lubricant can be stored in the grease storage cavity 111. The axial outer side of the first bearing 12 is correspondingly provided with a sealing component 2 to prevent the lubricant from overflowing the transmission equipment. The sealing component 2 includes a sealing cover 21 and a retaining ring 22 sleeved on the transmission main shaft 3. The retaining ring 22 abuts against the transmission main shaft 3 and presses the sealing cover 21 against the first bearing 12. The sealing cover 21 and the retaining ring 22 are based on the transmission main shaft 3 and are axially positioned. Compared with the solution of setting the sealing device on the housing 4, the situation of partial load on the sealing surface can be avoided, and the reliability of the sealing of the transmission equipment can be effectively guaranteed. In addition, since only a single sealing cover 21 is required to achieve dustproof and sealing on the axial outer side of the first bearing 12, the sealing structure of the transmission equipment is simplified compared with the prior art, and the production cost of the transmission equipment is reduced.

[0041] Specifically, the inner holes of the retaining ring 22 and the sealing cover 21 are clearance-matched with the transmission main shaft 3. By heating the first bearing 12 and combining with an oil press, the first bearing 12 is pressed into place, and the axial positioning of the retaining ring 22 and the sealing cover 21 is achieved at the same time. It should be noted that the setting of the sealing cover 21 and the retaining ring 22 is particularly suitable for sealing bearings using grease, but is also applicable to bearings using lubricating oil.

[0042] It should be particularly noted that the reduction gear of the present invention can be applied to a variety of transmission equipment that requires the use of a transmission shaft, such as a reducer, a servo motor, etc., and is particularly suitable for a reducer.

[0043] like Figure 2 As shown, in the embodiment of the utility model, a lubricant accommodating chamber 216 is formed on the side of the sealing cover 21 facing the first bearing 12, and the lubricant accommodating chamber 216 is communicated with the roller channel 121 of the first bearing 12, and excess lubricant can be stored in the lubricant accommodating chamber 216. While satisfying the oil-blocking and dust-proof functions, a certain amount of lubricant can also be added to the first bearing 12 after it has been working for a long time. Specifically, in some embodiments of the utility model, the first bearing 12 is arranged near the output end of the transmission main shaft 3. Considering that the first bearing 12 is borne by a large load, the first bearing 12 is preferably a spherical roller bearing. The spherical roller bearing has double-row rollers, the outer ring of the bearing has a common spherical raceway, the inner ring of the bearing has two raceways and is inclined at an angle relative to the bearing axis. The first bearing 12 is provided with a grease storage cavity 111 and a lubricant accommodating cavity 216 on the inner and outer sides, both of which can store a certain amount of lubricant, and then the lubricant is replenished from both sides during the operation of the first bearing 12. Especially when a lubricant such as grease is used that does not have fluidity, the above-mentioned arrangement can ensure that the double-row rollers can be fully lubricated.

[0044] In the embodiment of the utility model, the sealing cover 21 includes a clamping portion 211 and a chamber sealing portion 212 which are arranged in sequence from the inside to the outside. The clamping portion 211 is clamped between the inner ring of the first bearing 12 and the retaining ring 22. The chamber sealing portion 212 is arranged to cover the roller channel 121 of the first bearing 12 and form a lubricant accommodating chamber 216. The chamber sealing portion 212 is spaced apart from the roller channel 121 of the first bearing 12 to avoid interference. Specifically, the chamber sealing portion 212 can be partially or entirely embedded in the first port, which can improve the compactness of the transmission device on the one hand, and on the other hand, due to the small exposed area of ​​the peripheral side of the sealing cover, it can also further prevent dust from entering.

[0045] In the embodiment of the utility model, the pressing part 211 and the chamber sealing part 212 are formed by bending a metal plate in one piece, and the structural strength of the sealing cover 21 can be improved by the bending process. Specifically, the sealing cover 21 is set to be made of aluminum alloy and has a thin-walled stamping structure. Of course, the utility model is not limited to this, and the sealing cover 21 can also be made of a combination of one or more materials selected from stainless steel, low carbon steel, and alloy steel.

[0046] In an embodiment of the utility model, the chamber sealing portion 212 includes a first bending section 213, a straight section 214 and a second bending section 215 which are arranged in sequence from the clamping portion 211 to the outside. The first bending section 213 is bent from the clamping portion 211 and extends obliquely in a direction away from the first bearing 12, and the angle between the first bending section 213 and the clamping portion 211 is an obtuse angle. The straight section 214 extends horizontally outward from the outer end of the first bending section 213, and the second bending section 215 is bent from the outer end of the straight section 214 toward the outer ring of the first bearing 12. The second bent section 215 is sealed with the outer ring of the first bearing 12 to prevent lubricant from overflowing. The straight section 214 is spaced apart from the retaining frame of the first bearing 12. Even if the straight section 214 is deformed by impact, as long as the deformation is less than a certain margin, the straight section 214 will not interfere with the retaining frame of the first bearing 12. The setting of the first bent section 213 improves the structural strength of the sealing cover 21 while avoiding the retaining frame of the first bearing 12.

[0047] In some embodiments of the utility model, the sealing cover 21 further includes an elastic seal 217 disposed at one end of the chamber sealing portion 212 away from the pressing portion 211, and the elastic seal 217 is sealed and pressed on the outer ring of the first bearing 12 to achieve sealing of the transmission device. Specifically, the elastic seal 217 is preferably made of rubber material, and the elastic seal 217 is sleeved on the first bending portion and the straight section.

[0048] In some embodiments of the utility model, the lubricant of the first bearing 12 is grease. Since the grease has a high viscosity, a gap seal can be used between the sealing cover 21 and the outer ring of the first bearing 12. Specifically, an axial gap is formed between the second bent portion and the outer ring of the first bearing 12. In addition, when the gap seal is used, the sealing cover 21 can be a thick plate instead of a thin-walled stamping structure, and an axial gap is also provided between the sealing cover 21 and the outer ring of the first bearing 12.

[0049] like Figure 1 and Figure 3As shown, in the embodiment of the utility model, the bearing assembly 1 further includes a second bearing 13, which is arranged at the second end of the bearing mounting hole and can be rotatably passed through by the transmission main shaft 3, and the sealing assembly 2 further includes a dynamic seal 23 sleeved on the outer side of the transmission main shaft 3, which is located between the first bearing 12 and the second bearing 13 and can be relatively rotatably arranged for the transmission main shaft 3. Then, through the dynamic seal 23 and the transmission main shaft 3, the bearing mounting hole of the bearing seat 11 can be separated into two independent spaces, and according to the actual use conditions of the transmission equipment, different lubricants can be selected for the first bearing 12 and the second bearing 13, and the two lubricants can be prevented from mixing.

[0050] Specifically, the dynamic seal 23 adopts a double-lip skeleton oil seal, the outer ring of the double-lip skeleton oil seal is pressed on the bearing seat 11 through interference fit, and the inner ring of the double-lip skeleton oil seal is sealed with the transmission main shaft 3 by compression of the double-lip type nitrile rubber material. During the rotation of the transmission main shaft 3, the double-lip skeleton oil seal and the bearing seat 11 do not move, the lip wear of the double-lip skeleton oil seal is small, the force is evenly applied, and the sealing is reliable. Compared with the traditional O-ring sealing solution, there is no need to set an isolation ring on the transmission main shaft 3, which reduces the number of seals, simplifies the sealing structure, and effectively reduces the production cost of the transmission equipment. Of course, the utility model is not limited to this, and the dynamic seal 23 can also adopt a single-lip skeleton oil seal.

[0051] like Figure 3 As shown, in the embodiment of the utility model, a sealing stop portion 112 is protruded on the inner wall of the bearing mounting hole, and a grease storage cavity 111 is provided between the sealing stop portion 112 and the first bearing 12. The side of the sealing stop portion 112 facing the second bearing 13 is used to abut and limit the dynamic seal 23 to prevent the dynamic seal 23 from moving along the transmission main shaft 3 and falling into the grease storage cavity 111.

[0052] In the embodiment of the utility model, a filling port 14 for filling lubricant is provided on the outer wall of the bearing seat 11 , and the filling port 14 is connected to the grease storage cavity 111 to facilitate timely filling of lubricant to ensure normal operation of the first bearing 12 .

[0053] In order to achieve the above objectives, the utility model further provides a reducer, wherein the reducer comprises a transmission main shaft 3 and the above-mentioned sealing device for the transmission device, and a step portion 31 is formed on the transmission main shaft 3 to abut against the retaining ring 22. Since the reducer adopts all the technical solutions of the above-mentioned embodiments, it has at least the above-mentioned beneficial effects, which will not be described one by one here.

[0054] The following is the specific configuration of the reducer in a specific embodiment of the utility model:

[0055] like Figure 1As shown, the bearing seat 11 is installed on the housing 4 of the reducer, and an O-ring 24 is provided at the joint between the bearing seat 11 and the housing 4 to achieve static sealing between the bearing seat 11 and the housing 4; the speed of the transmission main shaft 3 is maintained in the range of 15-30r / min; the second bearing 13 (cylindrical roller bearing) is lubricated and cooled by lubricating oil, the first bearing 12 (cylindrical roller bearing) is lubricated and cooled by grease, and the dynamic seal 23 (double-lip skeleton oil seal), the bearing seat 11, the sealing cover 21 and the transmission main shaft 3 Together they form a sealed dry space, and the dynamic seal 23 plays a sealing role to prevent the lubricating oil in the box body 4 from penetrating into the grease storage chamber 111 to avoid the hidden danger of oil leakage. The linear speed of the dynamic seal 23 is maintained at 0.075m / s-0.15m / s; the first bearing 12 is filled with grease through the grease nozzle set at the filling port 14. The grease is relatively viscous and the amount used is relatively small, and it is not easy to leak; considering that the step portion 31 of the transmission main shaft 3 is subjected to a large force and matches the assembly requirements, the step portion 31 is A backing groove 32 is provided, and the retaining ring 22 is used to make the stop surface of the sealing cover 21 flat for axial positioning. The inner hole of the sealing cover 21 and the transmission main shaft 3 and the retaining ring 22 and the transmission main shaft 3 are radially positioned by clearance fit. The retaining ring 22 and the sealing cover 21 are installed on the transmission main shaft 3 in sequence. The first bearing 12 and the transmission main shaft 3 adopt interference fit. The first bearing 12 is pressed into place by heating the first bearing 12 and combining with an oil press, and the axial positioning of the retaining ring 22 and the sealing cover 21 is achieved at the same time; the sealing cover 21 is 0. The 5mm thick aluminum alloy is formed by stamping. An elastic seal 217 is provided on the second bending section 215 of the sealing cover 21. The sealing position linear speed of the elastic seal 217 is maintained at 0.14m / s-0.27m / s. The elastic seal 217 is made of rubber material (such as nitrile rubber, fluororubber and other rubber materials) and wraps the second bending section and part of the straight section 214. After the sealing cover 21 is installed in place, the compression of the elastic seal 217 is used to seal the grease and prevent dust.

[0056] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A sealing device for transmission equipment, characterized in that: The sealing device for transmission equipment comprises: A bearing assembly (1) comprises a bearing seat (11) and a first bearing (12), wherein the bearing seat (11) has a bearing mounting hole, the first bearing (12) is arranged at a first end of the bearing mounting hole and can be rotatably passed through by a transmission main shaft (3), and the transmission main shaft (3) and the inner wall of the bearing mounting hole enclose a grease storage cavity (111), and the grease storage cavity (111) is located axially inward of the first bearing (12); A sealing assembly (2) comprises a sealing cover (21) and a retaining ring (22) which are sequentially sleeved on the transmission main shaft (3) from the axial outer side of the first bearing (12); a side of the retaining ring (22) facing away from the sealing cover (21) is used to abut against the transmission main shaft (3) so as to press the sealing cover (21) onto the first bearing (12).

2. The sealing device for transmission equipment according to claim 1, characterized in that: A lubricant accommodating chamber (216) is formed on a side of the sealing cover (21) facing the first bearing (12), and the lubricant accommodating chamber (216) is in communication with a roller channel (121) of the first bearing (12).

3. The sealing device for transmission equipment according to claim 2, characterized in that: The sealing cover (21) comprises a clamping portion (211) and a chamber sealing portion (212) which are arranged in sequence from the inside to the outside, the clamping portion (211) is clamped between the inner ring of the first bearing (12) and the retaining ring (22), and the chamber sealing portion (212) is arranged to seal the roller channel (121) of the first bearing (12) and form the lubricant containing cavity (216).

4. The sealing device for transmission equipment according to claim 3, characterized in that: The pressing portion (211) and the chamber sealing portion (212) are formed by integrally bending a metal plate.

5. The sealing device for transmission equipment according to claim 3, characterized in that: The chamber sealing portion (212) comprises a first bending section (213), a straight section (214) and a second bending section (215) which are sequentially arranged outward from the clamping portion (211); the first bending section (213) is bent from the clamping portion (211) and extends obliquely in a direction away from the first bearing (12); the straight section (214) extends horizontally outward from the outer end of the first bending section (213); and the second bending section (215) is bent from the outer end of the straight section (214) toward the outer ring of the first bearing (12).

6. The sealing device for transmission equipment according to claim 3, characterized in that: The sealing cover (21) further comprises an elastic sealing member (217) disposed at one end of the chamber sealing member (212) away from the pressing member (211), wherein the elastic sealing member (217) is sealed and pressed against the outer ring of the first bearing (12); Alternatively, an axial gap is formed between an end of the chamber sealing portion (212) away from the pressing portion (211) and an outer ring of the first bearing (12).

7. The sealing device for transmission equipment according to any one of claims 1 to 6, characterized in that: The bearing assembly (1) further comprises a second bearing (13), the second bearing (13) being arranged at a second end of the bearing mounting hole and allowing the transmission main shaft (3) to rotatably pass therethrough, and the sealing assembly (2) further comprises a dynamic seal (23) sleeved on the outer side of the transmission main shaft (3), the dynamic seal (23) being located between the first bearing (12) and the second bearing (13) and allowing the transmission main shaft (3) to be relatively rotatably arranged.

8. The sealing device for transmission equipment according to claim 7, characterized in that: A sealing stopper (112) is also protruded from the inner wall of the bearing mounting hole, and the grease storage cavity (111) is provided between the sealing stopper (112) and the first bearing (12). The side of the sealing stopper (112) facing the second bearing (13) is used for abutting and limiting the dynamic seal (23).

9. The sealing device for transmission equipment according to any one of claims 1 to 6, characterized in that: A filling port (14) for filling lubricant is arranged on the outer wall of the bearing seat (11), and the filling port (14) is communicated with the grease storage cavity (111).

10. A reducer, characterized in that: The reducer comprises a transmission main shaft (3) and a sealing device for a transmission device according to any one of claims 1 to 9, wherein a step portion (31) abutting against the retaining ring (22) is formed on the transmission main shaft (3).

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