Transmission output shaft sealing structure and transmission mechanism

Abstract

The utility model provides a transmission output shaft sealing structure and a transmission mechanism, the transmission output shaft sealing structure comprises a dustproof sealing sleeve, the dustproof sealing sleeve is arranged on the periphery of a transmission output shaft and a front main reduction spline shaft, and the inner end of the dustproof sealing sleeve is provided with a plugging cover; the plugging cover can abut against the transmission shell so as to plug the output shaft hole. According to the transmission output shaft sealing structure, the transmission output shaft and the front main reduction spline shaft are connected in a sealed mode through the dustproof sealing sleeve, the plugging cover at the inner end of the dustproof sealing sleeve can effectively plug the shaft hole of the output shaft, and structural sealing of the shaft hole of the output shaft is guaranteed; and the service life of the transmission output shaft can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission structure, and more specifically, relates to a transmission output shaft sealing structure and a transmission mechanism. Background Art

[0002] As a main component of hybrid vehicles, hybrid transmissions have also been developed to a certain extent. The transmission output shaft of a hybrid transmission is generally connected to the front main reducer input shaft to output power to the front main reducer, realize the driving effect on the front main reducer, and ensure the transmission efficiency between the transmission output shaft and the front main reducer input shaft.

[0003] However, the above mechanism still has certain defects in the working process. The existing transmission output shaft is generally directly exposed to the outside, and external dust is very easy to adhere to the outer peripheral wall of the transmission output shaft, and even part of it will enter the transmission housing, thereby affecting the lubrication effect of the transmission output shaft and other components, increasing the wear of the transmission output shaft, and affecting the service life of the transmission output shaft. Utility Model Content

[0004] The utility model aims to provide a transmission output shaft sealing structure and a transmission mechanism, which can effectively seal the transmission output shaft and extend the service life of the transmission output shaft.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a transmission output shaft sealing structure, including a dustproof sealing sleeve, which is arranged on the outer periphery of the transmission output shaft and the front main reduction spline shaft, and the inner end of the dustproof sealing sleeve has a sealing cover, which can be pressed against the transmission housing to seal the output shaft shaft hole.

[0006] In one possible implementation, the dustproof sealing sleeve includes a first sleeve and a second sleeve that are adjacent to each other, the first sleeve is sleeved on the transmission output shaft, the sealing cover is connected to the inner end of the first sleeve, and the second sleeve is used to be sleeved on the outer periphery of the transmission output shaft and the front main reduction spline shaft.

[0007] In one possible implementation, the second sleeve includes a first sleeve portion sleeved on the outer periphery of the transmission output shaft, a second sleeve portion sleeved on the outer periphery of the front main reduction spline shaft, and a transition connecting tube connected between the first sleeve portion and the second sleeve portion, and two second clamps are respectively sleeved on the outer peripheries of the first sleeve portion and the second sleeve portion in a one-to-one manner.

[0008] As a parallel embodiment, the dustproof sealing sleeve includes an integrally formed first sleeve portion and a second sleeve portion, the first sleeve portion is sleeved on the transmission output shaft, the sealing cover is connected to the inner end of the first sleeve portion, and the second sleeve portion is used to be sleeved on the outer periphery of the transmission output shaft and the front main reduction spline shaft.

[0009] In some embodiments, the sealing cover includes an inner conical cylinder section and an outer conical cylinder section, the opening of the inner conical cylinder section is arranged toward the inner end of the transmission output shaft, the outer conical cylinder section is connected to the inner end of the inner conical cylinder section and is arranged around the outer circumference of the inner conical cylinder section, and the opening of the outer conical cylinder section is arranged toward the outer end of the transmission output shaft.

[0010] In a possible implementation, a pressure ring plate is provided on the outer periphery of the sealing cover, the plate surface of the pressure ring plate is arranged perpendicular to the main axis of the sealing cover, and the inner end surface of the pressure ring plate abuts against the outer end surface of the dynamic seal.

[0011] In a possible implementation, a mounting clamp is provided on the outer peripheral sleeve of the dustproof sealing sleeve, a mounting groove with an inwardly concave arrangement is provided on the outer peripheral wall of the dustproof sealing sleeve, and the mounting clamp is arranged in the mounting groove.

[0012] In some embodiments, the mounting clamp includes an upper half magnetic ring and a lower half magnetic ring, and the upper half magnetic ring and the lower half magnetic ring can be attracted to each other to fit around the outer circumference of the transmission output shaft or the front main reducer spline shaft.

[0013] Compared with the prior art, the scheme shown in the embodiment of the present application provides a transmission output shaft sealing structure, which realizes a sealed connection between the transmission output shaft and the front main reducer spline shaft by setting a dustproof sealing sleeve. The sealing cover at the inner end of the dustproof sealing sleeve can effectively seal the output shaft hole, ensuring the structural sealing of the output shaft hole, which helps to extend the service life of the transmission output shaft.

[0014] The utility model also provides a transmission mechanism, which includes a transmission, a front main reducer and a transmission output shaft sealing structure. The transmission includes a transmission output shaft, and a first ring groove with an inward concave arrangement is provided on the outer peripheral wall of the transmission output shaft. A first clamping ring that is clamped in the first ring groove is provided on the inner peripheral wall of the dustproof sealing sleeve.

[0015] In a possible implementation, the front main reducer includes a front main reducer spline shaft, a second annular groove with an inwardly concave arrangement is provided on the outer peripheral wall of the front main reducer spline shaft, and a second clamping ring clamped in the second annular groove is provided on the inner peripheral wall of the dustproof sealing sleeve.

[0016] The above-mentioned transmission mechanism uses a dustproof sealing sleeve to achieve a sealed connection between the transmission output shaft and the front main reducer spline shaft, and uses a sealing cover at the inner end of the dustproof sealing sleeve to effectively seal the output shaft hole to ensure the structural sealing of the output shaft hole, which helps to extend the service life of the transmission output shaft.

[0017] The utility model also provides a vehicle, which includes a transmission mechanism, and its effect is consistent with the effect of the above-mentioned transmission mechanism, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A schematic diagram of the exploded structure of the transmission mechanism provided in the embodiment of the utility model;

[0020] Figure 2 For the utility model embodiment Figure 1 A schematic diagram of the main cross-sectional structure of the middle transmission mechanism;

[0021] Figure 3 A schematic diagram of a front cross-sectional structure of another embodiment of the transmission mechanism provided by the embodiment of the utility model;

[0022] Figure 4 For the utility model embodiment Figure 2 A schematic diagram of the main cross-sectional structure of the output shaft of the transmission;

[0023] Figure 5 For the utility model embodiment Figure 2 A schematic diagram of the main cross-sectional structure of the first sleeve;

[0024] Figure 6 For the utility model embodiment Figure 2 A schematic diagram of the main cross-sectional structure of the second sleeve;

[0025] Figure 7 A schematic cross-sectional structural diagram of another embodiment of the mounting clamp provided in the embodiment of the utility model in use.

[0026] Among them, the reference numerals in the figure are:

[0027] 1. Dustproof sealing sleeve; 11. Installation groove; 12. First retaining ring; 13. Second retaining ring; 14. First sleeve part; 15. Second sleeve part; 2. Installation clamp; 21. First clamp; 22. Second clamp; 23. Upper magnetic ring; 24. Lower magnetic ring; 3. Sealing cover; 31. Inner cone section; 32. Outer cone section; 4. First sleeve; 41. Pressure ring plate; 5. Second sleeve; 51. First sleeve part; 52. Second sleeve part; 53. Transition sleeve; 54. Compensation part; 6. Transmission; 61. Transmission output shaft; 62. Output shaft hole; 63. First ring groove; 7. Front main reducer spline shaft; 71. Second ring groove. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] In the claims, specification and the above-mentioned drawings of the present utility model, the terms "front" and "rear" are the same as the front-to-back direction of the vehicle body, "left" and "right" are the same as the left-to-right direction of the vehicle body, and "up" and "down" are the same as the up-down direction of the vehicle body; the term "inside" refers to the direction toward the central axis of the vehicle body, and the term "outside" refers to the direction away from the central axis of the vehicle body, wherein the central axis of the vehicle body is parallel to the front-to-back direction of the vehicle body. The remaining directional words, unless otherwise clearly defined, such as the use of the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "clockwise", "counterclockwise", "high", "low" and the like to indicate the direction or position relationship are based on the direction and position relationship shown in the drawings, and are 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 direction or be constructed and operated in a specific direction, so they cannot be understood as limiting the specific protection scope of the present utility model.

[0030] Please also read Figures 1 to 6 The transmission output shaft sealing structure and transmission mechanism provided by the utility model are now described. The transmission output shaft sealing structure includes a dustproof sealing sleeve 1, which is arranged on the outer periphery of the transmission output shaft 61 and the front main reduction spline shaft 7. The inner end of the dustproof sealing sleeve 1 has a blocking cover 3, which can be pressed against the transmission housing to block the output shaft shaft hole 62.

[0031] Compared with the prior art, the transmission output shaft sealing structure provided in this embodiment realizes a sealed connection between the transmission output shaft 61 and the front main reduction spline shaft 7 by providing a dustproof sealing sleeve 1. The sealing cover 3 at the inner end of the dustproof sealing sleeve 1 can effectively seal the output shaft hole 62, thereby ensuring the structural sealing of the output shaft hole 62 and helping to extend the service life of the transmission output shaft 61.

[0032] In this embodiment, for the convenience of description, the end of the transmission output shaft 61 located inside the transmission housing is defined as the inner end, and the end of the transmission output shaft 61 extending out of the transmission housing is defined as the outer end. The outwardly extending portion of the transmission output shaft 61 is protected by providing a dustproof seal sleeve 1. The dustproof seal sleeve 1 can rotate synchronously with the transmission output shaft 61 and effectively connect with the dynamic ring of the dynamic seal to ensure a good dustproof sealing effect.

[0033] At the same time, the sealing cover 3 located at the inner end of the transmission output shaft 61 can effectively seal the output shaft hole 62 and effectively connect with the dynamic ring of the dynamic seal. The dustproof sealing sleeve 1 and the above-mentioned dynamic ring can rotate synchronously with the transmission output shaft 61 to prevent external impurities and dust from entering the transmission housing, thereby avoiding wear of components caused by the entry of external impurities.

[0034] In some possible implementations, the above-mentioned characteristic dustproof sealing sleeve 1 is used as follows Figure 3 , Figure 5 and Figure 6 See Figure Figure 3 , Figure 5 and Figure 6 The dustproof sealing sleeve 1 includes a first sleeve 4 and a second sleeve 5 which are adjacently arranged. The first sleeve 4 is sleeved on the transmission output shaft 61 , the sealing cover 3 is connected to the inner end of the first sleeve 4 , and the second sleeve 5 is used to be sleeved on the outer periphery of the transmission output shaft 61 and the front main reduction spline shaft 7 .

[0035] In this embodiment, the dustproof seal sleeve 1 adopts the form of a first sleeve 4 and a second sleeve 5 being separately arranged. The above-mentioned structural form is not only convenient for the manufacture of components, but also more convenient for the assembly of the structure. The first sleeve 4 is sleeved on the transmission output shaft 61, and the output shaft hole 62 is blocked by the blocking cover 3 at the inner end of the first sleeve 4, so as to realize the sealing connection between the transmission output shaft 61 and the transmission housing to prevent the entry of impurities.

[0036] At the same time, the two ends of the second sleeve 5 are respectively and one by one sleeved on the outer circumference of the transmission output shaft 61 and the front main reduction spline shaft 7, which can protect the position where the transmission output shaft 61 and the front main reduction spline shaft 7 are connected to each other, realize effective connection between the two, prevent dust and other impurities from entering the gap between the two, help reduce the wear of the components, and extend the service life of the components.

[0037] In some possible implementations, the second sleeve 5 of the above-mentioned feature is adopted as follows Figure 2 and Figure 6 See the structure shown. Figure 2 and Figure 6 The second sleeve 5 includes a first sleeve portion 51 sleeved on the outer periphery of the transmission output shaft 61, a second sleeve portion 52 sleeved on the outer periphery of the front main reduction spline shaft 7, and a transition connection tube 53 connected between the first sleeve portion 51 and the second sleeve portion 52.

[0038] In this embodiment, the second sleeve 5 can protect the connection between the transmission output shaft 61 and the front main reduction spline shaft 7. The first sleeve portion 51 is sleeved on the outer periphery of the transmission output shaft 61, and the second sleeve portion 52 is sleeved on the outer periphery of the front main reduction spline shaft 7. The middle transition connection tube 53 is used to protect the connection position between the transmission output shaft 61 and the front main reduction spline shaft 7. The transition connection tube 53 can perform structural avoidance for the two, and can move synchronously with the two, so that an independent sealing environment is formed inside the second sleeve 5, which is used to protect the sealing performance of the connection position between the two.

[0039] In some embodiments, the above-mentioned characteristic transition connection sleeve 53 can be adopted as follows Figure 6 See the structure shown. Figure 6 A compensating portion 54 is provided in the axial middle of the transition connection tube 53, and the compensating portion 54 is protruded toward the outer periphery of the transition connection tube 53. The protruding structure of the compensating portion 54 provides a larger space inside, thereby achieving structural avoidance of the end of the front main reduction spline shaft 7. In addition, the compensating portion 54 can achieve compensation for the axial dimension of the component, so that the spacing between the first sleeve portion 51 and the second sleeve portion 52 has a certain degree of adjustability, which is convenient for subsequent assembly and improves the convenience of assembly.

[0040] In some embodiments, the above-mentioned characteristic blocking cover 3 can be used as follows Figure 2 , Figure 3 and Figure 5 See the structure shown. Figure 2 , Figure 3 and Figure 5 The sealing cover 3 includes an inner cone section 31 and an outer cone section 32. The opening of the inner cone section 31 is arranged toward the inner end of the transmission output shaft 61. The outer cone section 32 is connected to the inner end of the inner cone section 31 and is arranged around the outer periphery of the inner cone section 31. The opening of the outer cone section 32 is arranged toward the outer end of the transmission output shaft 61.

[0041] In this embodiment, the sealing cover 3 adopts the form of an inner cone cylinder section 31 and an outer cone cylinder section 32 connected to each other, the inner end of the inner cone cylinder section 31 is connected to the inner end of the outer cone cylinder section 32, and the two are integrally formed to form a structure recessed into the output shaft shaft hole 62, which can effectively seal the space between the output shaft shaft hole 62 and the transmission output shaft 61, prevent external dust and other impurities from entering the transmission 6, and has good sealing performance.

[0042] Specifically, the inner cone cylinder section 31 and the outer cone cylinder section 32 are both conical cylindrical structures, and the openings of the inner cone cylinder section 31 and the outer cone cylinder section 32 refer to the direction of the large mouth of the two, that is, the direction of the bell mouth. By limiting the opening direction of the two, the two form a flexible structure that presses against the outside of the transmission housing to ensure the tightness of the seal. The combination of the inner cone cylinder section 31 and the outer cone cylinder section 32 allows the blocking cover 3 to fit more closely on the transmission housing, achieving reliable blocking of the output shaft shaft hole 62. Compared with the method of directly blocking through a flat plate structure, it has a more rigorous blocking effect, can avoid the adverse effects of factors such as vibration during driving on the blocking performance, and is convenient for improving the reliability of the seal.

[0043] In some possible implementations, the above-mentioned characteristic blocking cover 3 is adopted as follows Figure 5 See the structure shown. Figure 5 A pressing ring plate 41 is provided on the outer periphery of the blocking cover 3. The plate surface of the pressing ring plate 41 is arranged perpendicular to the main axis of the blocking cover 3. The inner end surface of the pressing ring plate 41 abuts against the outer end surface of the dynamic seal.

[0044] In this embodiment, a dynamic seal is provided at the output shaft hole 62, and an effective connection with the dynamic seal dynamic ring is achieved by setting a pressure ring plate 41. The two rotate synchronously with the transmission output shaft 61 to form an effective blockage for the output shaft hole 62 and improve the tightness of the seal.

[0045] Specifically, a dynamic seal is provided at the output shaft hole 62, and the end surface of the pressure ring plate 41 adjacent to the transmission housing can contact the outer end surface of the dynamic seal to form a tight sealing effect. The pressure ring plate 41 and the blocking cover 3 are integrally formed, both of which are flexible material components and can reliably block the output shaft hole 62.

[0046] In some possible implementations, the above-mentioned characteristic dustproof sealing sleeve 1 is used as follows Figures 2 to 6 See the structure shown. Figures 2 to 6 The outer circumference of the dustproof sealing sleeve 1 is provided with a mounting clamp 2, and the outer circumferential wall of the dustproof sealing sleeve 1 is provided with a mounting groove 11 with an inward concave setting, and the mounting clamp 2 is arranged in the mounting groove 11.

[0047] In this embodiment, the outer end of the dustproof sealing sleeve 1 extends outward until it is sleeved on the outer periphery of the front main reducer spline shaft 7. The axial position of the dustproof sealing sleeve 1 and the front main reducer spline shaft 7 is locked by installing the clamp 2, so that the position where the transmission output shaft 61 and the front main reducer spline shaft 7 are connected to each other can be effectively protected to prevent the entry of impurities, ensure the power transmission performance of the structure, reduce the wear of the components, and facilitate extending the service life of the components.

[0048] Corresponding to the position where the mounting clamp 2 needs to be set, a mounting groove 11 extending circumferentially into a closed ring is set on the outer peripheral wall of the dustproof sealing sleeve 1. The mounting groove 11 can form an axial position limit for the mounting clamp 2 to ensure that the mounting clamp 2 effectively fixes the dustproof sealing sleeve 1.

[0049] When the dustproof sealing sleeve 1 is used in combination with the first sleeve 4 and the second sleeve 5, three mounting clamps 2 are provided. The three mounting clamps 2 include a first clamp 21 and two second clamps 22. The first clamp 21 is sleeved on the outer end of the first sleeve 4, and the two second clamps 22 are sleeved on the two ends of the second sleeve 5 in a one-to-one correspondence, so as to ensure the reliability of the installation of the first sleeve 4 and the second sleeve 5.

[0050] When the dustproof sealing sleeve 1 adopts the form of an integrally formed first sleeve portion 14 and second sleeve portion 15, two mounting clamps 2 are provided, and the two mounting clamps 2 include a first clamp 21 and a second clamp 22. The first clamp 21 is sleeved on the outer periphery of the first sleeve portion 14 and is arranged adjacent to the second sleeve portion 15. The second clamp 22 is sleeved on the outer periphery of the second sleeve portion 15 and is located at the outer end of the second sleeve portion 15, thereby ensuring the reliability of the installation of the first sleeve portion 14 and the second sleeve portion 15.

[0051] Specifically, the mounting clamp 2 adopts an earless stepless clamp, which is made of stainless steel strip. The earless stepless clamp is used in occasions where space is restricted. There is a hook on the outside of the clamp. After clamping, the expansion force generated by the elasticity of the clamped material is used to maintain its sealing. The earless stepless clamp can be reused and is suitable for limiting and fixing the above-mentioned dustproof sealing sleeve 1.

[0052] For details, please refer to Figure 7 The mounting clamp 2 includes an upper magnetic ring 23 and a lower magnetic ring 24 , and the upper magnetic ring 23 and the lower magnetic ring 24 can be attracted to each other to embrace the outer periphery of the transmission output shaft 61 or the front main reduction spline shaft 7 .

[0053] In this embodiment, the dustproof sealing sleeve 1 is fixed on the transmission output shaft 61 or the front main reducer spline shaft 7 by utilizing the magnetic attraction of the upper magnetic ring 23 and the lower magnetic ring 24, thereby ensuring the stability of the installation position of the dustproof sealing sleeve 1.

[0054] At the same time, the upper magnetic ring 23 can form a magnetic attraction with the transmission output shaft 61 or the front main reducer spline shaft 7, and the lower magnetic ring 24 can also form a magnetic attraction with the transmission output shaft 61 or the front main reducer spline shaft 7, further enhancing the fixing effect of the dustproof sealing sleeve 1 and having a reliable locking effect.

[0055] The utility model also provides a transmission mechanism, which includes a transmission 6, a front main reducer and a transmission output shaft sealing structure. The transmission 6 includes a transmission output shaft 61. The outer peripheral wall of the transmission output shaft 61 is provided with a first annular groove 63 with an inward concave setting. The inner peripheral wall of the dustproof sealing sleeve 1 is provided with a first clamping ring 12 that is clamped in the first annular groove 63.

[0056] In this embodiment, the first annular groove 63 extends in an annular shape along the circumferential direction of the outer peripheral wall of the transmission output shaft 61, and the first snap ring 12 extends in an annular shape along the circumferential direction of the inner peripheral wall of the dust seal sleeve 1. When the dust seal sleeve 1 is installed on the transmission output shaft 61, the first annular groove 63 and the first snap ring 12 are engaged with each other, so that the axial position of the dust seal sleeve 1 can be easily positioned, which helps to improve the assembly efficiency and ensure the installation accuracy.

[0057] For some possible implementations, see Figures 2 to 6 The front main reducer includes a front main reducer spline shaft 7, a second annular groove 71 with an inwardly concave arrangement is provided on the outer peripheral wall of the front main reducer spline shaft 7, and a second clamping ring 13 clamped in the second annular groove 71 is provided on the inner peripheral wall of the dust seal sleeve 1. When the dust seal sleeve 1 is installed on the front main reducer spline shaft 7, the axial position of the dust seal sleeve 1 is conveniently positioned through the clamping cooperation of the second annular groove 71 and the second clamping ring 13, which helps to improve assembly efficiency and ensure installation accuracy.

[0058] The above-mentioned transmission mechanism uses a dustproof sealing sleeve 1 to achieve a sealed connection between the transmission output shaft 61 and the front main reducer spline shaft 7. The mounting clamp 2 can reliably limit the dustproof sealing sleeve 1 to the outer periphery of the transmission output shaft 61 and the front main reducer spline shaft 7. The output shaft shaft hole 62 is effectively sealed with the help of the sealing cover 3 at the inner end of the dustproof sealing sleeve 1 to ensure the structural sealing of the output shaft shaft hole 62, which helps to extend the service life of the transmission output shaft 61.

[0059] Based on the same inventive concept, the embodiment of the present application further provides a vehicle, which includes a transmission mechanism, and its effect is consistent with that of the above transmission mechanism, and will not be described in detail here.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The transmission output shaft sealing structure is characterized by: The invention comprises a dustproof sealing sleeve (1), wherein the dustproof sealing sleeve (1) is arranged on the outer periphery of a transmission output shaft (61) and a front main reduction spline shaft (7), and the inner end of the dustproof sealing sleeve (1) is provided with a blocking cover (3), and the blocking cover (3) can be pressed against the transmission housing to block the output shaft shaft hole (62).

2. The transmission output shaft sealing structure according to claim 1, characterized in that: The dustproof sealing sleeve (1) comprises a first sleeve (4) and a second sleeve (5) which are arranged adjacent to each other, wherein the first sleeve (4) is sleeved on a transmission output shaft (61), the blocking cover (3) is connected to the inner end of the first sleeve (4), and the second sleeve (5) is used to be sleeved on the outer periphery of the transmission output shaft (61) and the front main reduction spline shaft (7).

3. The transmission output shaft sealing structure according to claim 2, characterized in that: The second sleeve (5) comprises a first sleeve portion (51) sleeved on the outer circumference of the transmission output shaft (61), a second sleeve portion (52) sleeved on the outer circumference of the front main reduction spline shaft (7), and a transition connection sleeve (53) connected between the first sleeve portion (51) and the second sleeve portion (52).

4. The transmission output shaft sealing structure according to claim 3, characterized in that: The dustproof sealing sleeve (1) comprises an integrally formed first sleeve portion (14) and a second sleeve portion (15); the first sleeve portion (14) is sleeved on a transmission output shaft (61); the blocking cover (3) is connected to the inner end of the first sleeve portion (14); one end of the second sleeve portion (15) is sleeved on the transmission output shaft (61) and the other end is sleeved on a front main reduction spline shaft (7).

5. The transmission output shaft sealing structure according to claim 1, characterized in that: The blocking cover (3) comprises an inner cone cylinder section (31) and an outer cone cylinder section (32); the opening of the inner cone cylinder section (31) is arranged toward the inner end of the transmission output shaft (61); the outer cone cylinder section (32) is connected to the inner end of the inner cone cylinder section (31) and is arranged around the outer circumference of the inner cone cylinder section (31); the opening of the outer cone cylinder section (32) is arranged toward the outer end of the transmission output shaft (61).

6. The transmission output shaft sealing structure according to any one of claims 1 to 5, characterized in that: A pressure ring plate (41) is provided on the outer periphery of the blocking cover (3), the plate surface of the pressure ring plate (41) is arranged perpendicular to the main axis of the blocking cover (3), and the inner end surface of the pressure ring plate (41) abuts against the outer end surface of the dynamic seal.

7. The transmission output shaft sealing structure according to any one of claims 1 to 5, characterized in that: The outer peripheral sleeve of the dustproof sealing sleeve (1) is provided with a mounting clamp (2), the outer peripheral wall of the dustproof sealing sleeve (1) is provided with a mounting groove (11) which is concavely arranged, and the mounting clamp (2) is embedded in the mounting groove (11).

8. The transmission output shaft sealing structure according to claim 7, characterized in that: The mounting clamp (2) comprises an upper magnetic ring (23) and a lower magnetic ring (24), wherein the upper magnetic ring (23) and the lower magnetic ring (24) can be attracted to each other to fit around the outer periphery of the transmission output shaft (61) or the front main reduction spline shaft (7).

9. A transmission mechanism, characterized in that: The invention comprises a transmission (6), a front main reducer and a transmission output shaft sealing structure as claimed in any one of claims 1 to 8, wherein the transmission (6) comprises a transmission output shaft (61), a first annular groove (63) which is concavely arranged is provided on the outer peripheral wall of the transmission output shaft (61), and a first retaining ring (12) which is engaged with the first annular groove (63) is provided on the inner peripheral wall of the dustproof sealing sleeve (1).

10. The transmission mechanism according to claim 9, characterized in that: The front main reducer comprises a front main reducer spline shaft (7), a second annular groove (71) with an inwardly concave arrangement is provided on the outer peripheral wall of the front main reducer spline shaft (7), and a second clamping ring (13) clamped in the second annular groove (71) is provided on the inner peripheral wall of the dustproof sealing sleeve (1).

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