Half shaft sealing structure of agricultural machine

Abstract

The invention belongs to the technical field of agricultural machines, and relates to a half shaft sealing structure of an agricultural machine, which comprises a half shaft shell seat and a driving half shaft which are coaxially arranged, an annular front end cover is fixed at the front end of the half shaft shell seat, an oil seal and a lip-shaped sealing ring are arranged between the front end cover and the driving half shaft, the front end of the front end cover is covered with a cover cap, and the front end of the cover cap is provided with a sealing ring. The inner wall of the cover cap is connected with the outer ring wall of the front end cover in a sealed mode, an annular end face groove corresponding to the cover cap is formed in the front end cover, the rear end of the cover cap is inserted into the annular end face groove and forms a labyrinth type sealing structure with the annular end face groove, and a sealing piece is arranged at the front end of the inner ring wall of the front end cover. The sealing piece extends forwards to form a plane sealing lip, and the plane sealing lip and the bottom of the inner cavity of the cover form a plane sealing structure. The half shaft sealing structure of the agricultural machine has the advantages of being simple in structure, good in sealing performance and wide in applicability.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural machinery and relates to a semi-axle sealing structure of an agricultural machinery. Background Art

[0002] The half-axle structure of agricultural machinery usually needs to be sealed with oil seals, but the use environment of agricultural machinery is relatively harsh, with water, mud and many sundries. When the agricultural machinery is in use, water, mud and many sundries will enter the sealing structure and affect the work of the oil seal. Therefore, it is necessary to design a sealing structure to protect the oil seal.

[0003] Chinese utility model patent CN221075144U (publication date: 2024.06.04) discloses a gearbox half-shaft sealing structure and a paddy field crawler machine, including a gear seat, a first rolling bearing, a skeleton oil seal, a half-shaft bridge tube, a second rolling bearing, an O-ring, a half-shaft end cover, a floating oil seal seat ring, a floating oil seal and functional components are all sleeved on the half-shaft, the gear seat is located at one end of the half-shaft, the first rolling bearing and the second rolling bearing are respectively installed at both ends of the half-shaft bridge tube, the skeleton oil seal is located at one end of the half-shaft bridge tube, the first rolling bearing is located between the gear seat and the skeleton oil seal, the half-shaft end cover is installed at the other end of the half-shaft bridge tube, the second rolling bearing is located between the half-shaft end cover and the half-shaft bridge tube, the floating oil seal seat ring is installed at the other end of the half-shaft through the O-ring, the floating oil seal seat ring is adjacent to the half-shaft end cover, the floating oil seal is located between the floating oil seal seat ring and the half-shaft end cover, and the functional components are installed at the other end of the half-shaft.

[0004] The above half-shaft structure adopts a floating oil seal and a floating oil seal seat ring is provided to prevent the entry of debris. However, the floating oil seal has high machining precision requirements and requires a special sealing oil system. More importantly, the replacement of the floating oil seal requires the redesign of the original half-shaft structure, which greatly increases the cost. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a semi-axle sealing structure for an agricultural machine, which has the advantages of simple structure, good sealing performance and wide applicability.

[0006] In order to solve the above technical problems, the purpose of the present invention is achieved through the following technical solutions:

[0007] A half-shaft sealing structure of an agricultural machine comprises a half-shaft housing seat and a driving half-shaft which are coaxially arranged. The driving half-shaft is rotatably arranged in the half-shaft housing seat and supported by a bearing. The front end of the driving half-shaft extends out of the half-shaft housing seat and is fitted with a driving wheel. An annular front end cover is fixed to the front end of the half-shaft housing seat. An oil seal and a lip-shaped sealing ring are arranged between the front end cover and the driving half-shaft. A front end cover of the front end cover is provided with a cover cover. The inner wall of the cover cover is sealingly connected to the outer ring wall of the front end cover. An annular end face groove corresponding to the cover cover is arranged on the front end cover. The rear end of the cover cover is inserted into the annular end face groove and forms a labyrinth sealing structure with the cover cover. A sealing member is arranged at the front end of the inner ring wall of the front end cover. A planar sealing lip is extended forward from the sealing member. The planar sealing lip forms a planar sealing structure with the bottom of the inner cavity of the cover cover.

[0008] In the above-mentioned semi-shaft sealing structure of an agricultural machine, the cover includes an outer cover part located on the outside of the front end cover, an end cover part on the front side and an inner cover part on the inside. The inner wall of the outer cover part is sealed with the outer annular wall of the front end cover, and its rear end cooperates with the annular end face groove. The rear side plane of the end cover part is sealed with the plane sealing lip.

[0009] In the above-mentioned half-shaft sealing structure of an agricultural machine, a limiting step cooperating with the inner cover is provided on the driving half-shaft, and the rear side surface of the driving wheel is in contact with the front side surface of the end cover and presses the cover tightly.

[0010] In the above-mentioned half-shaft sealing structure of an agricultural machine, a first annular mounting groove is provided on the outer ring wall of the front end cover, a first sealing ring is sleeved in the first mounting groove, and the inner wall of the outer cover part is gap-matched with the outer ring wall of the front end cover and is sealed and connected through the first sealing ring.

[0011] In the above-mentioned semi-axle sealing structure of an agricultural machine, the sealing component includes a U-shaped sealing skeleton with a front opening, the outer ring portion of the sealing skeleton is interference fit with the inner ring wall of the front end cover, and the planar sealing lip extends forward from the bottom of the inner cavity of the sealing skeleton, and its extended end face exceeds the front end face of the sealing skeleton and forms a lip-shaped sealing structure that can be deformed outward; preferably, the front end face of the sealing skeleton is flush with the front end face of the front end cover.

[0012] In the above-mentioned half-shaft sealing structure of an agricultural machine, a circumferential sealing lip extends inward from the front end of the inner ring portion of the sealing skeleton, the extended end surface of the circumferential sealing lip is lower than the extended end surface of the planar sealing lip, and the circumferential sealing lip is sealed to the inner wall of the inner cover portion.

[0013] In the above-mentioned half-shaft sealing structure of an agricultural machine, an inner convex ring is arranged on the inner ring wall of the front end cover, the rear end face of the seal abuts against the front end face of the inner convex ring to form an axial limiting structure, and the front end face of the oil seal abuts against the rear end face of the inner convex ring to form an axial limiting structure.

[0014] In the above-mentioned half-shaft sealing structure of an agricultural machine, the rear end of the front end cover is fastened to the half-shaft housing seat by fasteners, and the rear end of the front end cover is provided with a stopper that cooperates with the half-shaft housing seat, and an annular second mounting groove is provided adjacent to the outer side of the stopper, and a second sealing ring that is sealingly connected to the front end surface of the half-shaft housing seat is installed in the second mounting groove.

[0015] In the above-mentioned half-shaft sealing structure of an agricultural machine, the bearing includes a front bearing and a rear bearing, the front end cover is fixed to the half-shaft housing seat to press the outer ring of the front bearing, and the inner ring of the front bearing is interference fit with the driving half-shaft.

[0016] In the above-mentioned semi-axle sealing structure of an agricultural machine, the sealing element, the first sealing ring and the second sealing ring are all made of rubber material.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a semi-axle sealing structure for agricultural machinery, and designs a triple sealing structure: the labyrinth sealing structure of the cover and the front cover can effectively prevent solid debris such as crops from entering; the sealing structure of the inner wall of the cover and the outer ring wall of the front cover can effectively prevent water or other liquid debris from entering; the plane sealing structure of the cover and the sealing member forms a main sealing structure with the best sealing performance, ensuring the last line of defense of the sealing structure. The synergistic effect of the above triple sealing structure is sufficient to ensure the sealing effect of the semi-axle structure.

[0019] 2. The present invention adds a cover and a seal to the traditional skeleton oil seal, the half-axle structure basically maintains the original structure, and the front end cover only modifies a small amount of groove structure. Therefore, the present invention can modify the existing agricultural machine half-axle to have the sealing structure provided by the present invention.

[0020] 3. The present invention adopts a seal with a specific structure, and ensures the stability of its installation through a U-shaped sealing frame, and can form a very good sealing effect through the extended plane sealing lip. Furthermore, the seal also extends a circumferential sealing lip that contacts and connects with the inner cover of the cover, which not only increases the stability of the seal installation, but also provides a certain sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the present invention;

[0022] Figure 2 yes Figure 1 A partial enlarged view of

[0023] Figure 3 is a three-dimensional diagram of the seal of the present invention;

[0024] Figure 4 yes Figure 3 A cross-sectional view of

[0025] Figure numerals: 1. half-axle housing seat; 2. driving half-axle; 3. bearing; 4. driving wheel; 5. front end cover; 6. oil seal; 7. lip-type sealing ring; 8. cover; 9. annular end face groove; 10. sealing element; 11. flat sealing lip; 12. outer cover; 13. end cover; 14. inner cover; 15. limiting step; 16. first mounting groove; 17. sealing frame; 18. circumferential sealing lip; 19. inner convex ring; 20. stop; 21. second mounting groove. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to specific embodiments of the present invention. Figure 1-4 :

[0027] A half-axle sealing structure of an agricultural machine comprises a half-axle housing seat 1 and a driving half-axle 2 which are coaxially arranged. The driving half-axle 2 is rotatably arranged in the half-axle housing seat 1 and supported by a bearing 3. The front end of the driving half-axle 2 extends out of the half-axle housing seat 1 and is sleeved with a driving wheel 4. An annular front end cover 5 is fixed to the front end of the half-axle housing seat 1. An oil seal 6 and a lip-shaped sealing ring 7 are arranged between the front end cover 5 and the driving half-axle 2. A cover 8 is provided at the front end cover of the front end cover 5. The inner wall of the cover 8 is sealingly connected to the outer ring wall of the front end cover 5. An annular end face groove 9 corresponding to the cover 8 is provided on the front end cover 5. The rear end of the cover 8 is inserted into the annular end face groove 9 and forms a labyrinth sealing structure therewith. A sealing member 10 is provided at the front end of the inner ring wall of the front end cover 5. The sealing member 10 extends a planar sealing lip 11 forward. The planar sealing lip 11 forms a planar sealing structure with the bottom of the inner cavity of the cover 8.

[0028] Compare with Figure 1 When working, the power device drives the half shaft 2 to rotate after the power transmission of the gearbox. The labyrinth seal structure of the cover shell and the front cover 5 forms the first seal structure, which can effectively prevent solid debris such as crops from entering; the seal structure of the inner wall of the cover 8 and the outer ring wall of the front cover 5 forms the second seal structure, which can effectively prevent water or other liquid debris from entering; the plane seal structure of the cover 8 and the seal 10 forms the main seal structure with the best sealing performance, and the main seal structure forms the third seal structure. Through the above triple seal structure, various debris can be completely prevented from entering the cavity of the oil seal 6, ensuring the normal operation of the oil seal 6.

[0029] Compare with Figure 2In this embodiment, the cover 8 includes an outer cover portion 12 located on the outside of the front end cover 5, an end cover portion 13 on the front side and an inner cover portion 14 on the inside. The inner wall of the outer cover portion 12 is sealed with the outer annular wall of the front end cover 5, and its rear end cooperates with the annular end face groove 9. The rear side plane of the end cover portion 13 is sealed with the plane sealing lip 11.

[0030] The driving half shaft 2 is provided with a limiting step 15 matched with the inner cover part 14, and the rear side surface of the driving wheel 4 is in contact with the front side surface of the end cover part 13 and presses the cover 8. When the driving half shaft 2 and the driving wheel 4 rotate, the cover 8 rotates accordingly, thereby generating a circumferential displacement relative to the front end cover 5 and the seal 10. The sealing structure between the cover 8 and the front end cover 5, and the sealing structure between the cover 8 and the seal 10 are both dynamic sealing structures.

[0031] Among them, the second dynamic sealing structure is: a first annular mounting groove 16 is provided on the outer ring wall of the front end cover 5, a first sealing ring is sleeved in the first mounting groove 16, and the inner wall of the outer cover part 12 is gap-matched with the outer ring wall of the front end cover 5 and is sealed and connected through the first sealing ring.

[0032] Compare with Figure 3 In this embodiment, a seal 10 with a special structure is used. Specifically, the seal 10 includes a U-shaped sealing skeleton 17 with a front opening. The outer ring portion of the sealing skeleton 17 is interference fit with the inner ring wall of the front end cover 5. The planar sealing lip 11 extends forward from the bottom of the inner cavity of the sealing skeleton 17, and its extended end face exceeds the front end face of the sealing skeleton 17 to form a lip-shaped sealing structure that can be deformed outward. Preferably, the front end face of the sealing skeleton 17 is flush with the front end face of the front end cover 5.

[0033] Furthermore, a circumferential sealing lip 18 is extended inward from the front end of the inner ring portion of the sealing skeleton 17, and the extended end surface of the circumferential sealing lip 18 is lower than the extended end surface of the planar sealing lip 11. The circumferential sealing lip 18 is sealed to the inner wall of the inner cover portion 14. By providing the circumferential sealing lip 18, the inner cover portion 14 of the cover 8 can produce an extrusion effect on the seal 10, so that the installation of the seal 10 is more stable. At the same time, a certain sealing effect can also be generated between the circumferential sealing lip 18 and the cover 8 to supplement the sealing structure.

[0034] Furthermore, an inner convex ring 19 is provided on the inner ring wall of the front end cover 5, and the rear end face of the seal 10 abuts against the front end face of the inner convex ring 19 to form an axial limit structure, and the front end face of the oil seal 6 abuts against the rear end face of the inner convex ring 19 to form an axial limit structure. When the cover 8 is pressed, the cover 8 and the inner convex ring 19 squeeze the seal 10 at the same time, so that the plane sealing lip 11 of the seal 10 is deformed, thereby forming a sealing structure.

[0035] This embodiment further adds a sealing structure between the front end cover 5 and the half-axle housing seat 1. Specifically, the rear end of the front end cover 5 is fastened to the half-axle housing seat 1 by fasteners. The rear end of the front end cover 5 is provided with a stopper 20 that matches the half-axle housing seat 1. The outer side of the stopper 20 is adjacent to a second annular mounting groove 21. The second mounting groove 21 is provided with a second sealing ring that is sealed and connected to the front end surface of the half-axle housing seat 1. The bearing 3 includes a front bearing and a rear bearing. After the front end cover 5 is fixed to the half-axle housing seat 1, the outer ring of the front bearing is pressed. The inner ring of the front bearing is interference-fitted with the driving half-axle 2. By providing the second sealing ring, the sealing performance of the front end cover 5 and the half-axle housing seat 1 can be increased to prevent debris from entering through the gap between the two.

[0036] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A half-axle sealing structure for an agricultural machine, comprising a half-axle housing seat (1) and a driving half-axle (2) coaxially arranged, wherein the driving half-axle (2) is rotatably arranged in the half-axle housing seat (1) and supported by a bearing (3), the front end of the driving half-axle (2) extends out of the half-axle housing seat (1) and is sleeved with a driving wheel (4), the front end of the half-axle housing seat (1) is fixed with an annular front end cover (5), an oil seal (6) and a lip seal ring (7) are arranged between the front end cover (5) and the driving half-axle (2), characterized in that: The front end cover of the front end cover (5) is provided with a cover (8), the inner wall of the cover (8) is sealedly connected to the outer ring wall of the front end cover (5), the front end cover (5) is provided with an annular end face groove (9) corresponding to the cover (8), the rear end of the cover (8) is inserted into the annular end face groove (9) and forms a labyrinth seal structure therewith, and the front end of the inner ring wall of the front end cover (5) is provided with a sealing member (10), the sealing member (10) extends forward to form a planar sealing lip (11), and the planar sealing lip (11) forms a planar sealing structure with the bottom of the inner cavity of the cover (8).

2. A semi-shaft sealing structure for an agricultural machine according to claim 1, characterized in that: The cover (8) comprises an outer cover portion (12) located outside the front end cover (5), an end cover portion (13) on the front side, and an inner cover portion (14) on the inner side. The inner wall of the outer cover portion (12) is sealed with the outer annular wall of the front end cover (5), and its rear end cooperates with the annular end face groove (9). The rear side plane of the end cover portion (13) is sealed with the plane sealing lip (11).

3. The semi-shaft sealing structure of an agricultural machine according to claim 1, characterized in that: The driving half shaft (2) is provided with a limiting step (15) that cooperates with the inner cover portion (14), and the rear side surface of the driving wheel (4) is in contact with the front side surface of the end cover portion (13) and presses the cover (8).

4. The semi-shaft sealing structure of an agricultural machine according to claim 2, characterized in that: The outer ring wall of the front end cover (5) is provided with an annular first installation groove (16), a first sealing ring is sleeved in the first installation groove (16), and the inner wall of the cover (8) is gap-matched with the outer ring wall of the front end cover (5) and is sealed by the first sealing ring.

5. The half-shaft sealing structure of an agricultural machine according to claim 2, characterized in that: The sealing member (10) comprises a U-shaped sealing frame (17) with a front opening, the outer ring portion of the sealing frame (17) being interference fit with the inner ring wall of the front end cover (5), and the planar sealing lip (11) extending forward from the bottom of the inner cavity of the sealing frame (17), the extended end face of which exceeds the front end face of the sealing frame (17) and forms a lip-shaped sealing structure that can be deformed outward.

6. A semi-shaft sealing structure for an agricultural machine according to claim 5, characterized in that: A circumferential sealing lip (18) extends inward from the front end of the inner ring portion of the sealing frame (17); the extended end surface of the circumferential sealing lip (18) is lower than the extended end surface of the planar sealing lip (11); and the circumferential sealing lip (18) is sealingly connected to the inner wall of the inner cover portion (14).

7. A semi-shaft sealing structure for an agricultural machine according to claim 6, characterized in that: An inner convex ring (19) is provided on the inner ring wall of the front end cover (5), the rear end face of the sealing element (10) abuts against the front end face of the inner convex ring (19) to form an axial limiting structure, and the front end face of the oil seal (6) abuts against the rear end face of the inner convex ring (19) to form an axial limiting structure.

8. The half-shaft sealing structure of an agricultural machine according to claim 1, characterized in that: The rear end of the front end cover (5) is fastened to the half-axle housing seat (1) by means of fasteners, and the rear end of the front end cover (5) is provided with a stopper (20) that matches the half-axle housing seat (1), and an annular second mounting groove (21) is provided adjacent to the outer side of the stopper (20), and a second sealing ring that is sealingly connected to the front end surface of the half-axle housing seat (1) is sleeved in the second mounting groove (21).

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