Differential oil seal capable of preventing muddy water from invading

Abstract

The utility model relates to the technical field of sealing, in particular to a muddy water invasion prevention differential mechanism oil seal which comprises an oil seal body arranged on a half shaft in a sleeved mode and a dust cover connected to the half shaft, an elastic connecting body is connected between the oil seal body and the dust cover, and the oil seal body comprises an oil seal framework. The oil seal main body, the dustproof cover, the elastic connecting body and the half shaft form a sealing system, the rubber body wraps the outer portion of the oil seal framework and makes contact with the half shaft to form sealing, and the oil seal main body, the dustproof cover, the elastic connecting body and the half shaft form a first sealing cavity. The elastic connecting body can prevent dust and muddy water from entering the first sealing cavity, the situation that due to dust and muddy water entering, the inner dustproof lip is abraded intensively, and sealing of the main lip fails is avoided, and therefore the service life of the whole set of sealing is prolonged, and long-acting sealing is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a differential oil seal capable of preventing mud and water from intruding. Background Art

[0002] The differential oil seal is installed at the output shaft end of the gearbox. Its main function is to prevent the lubricating oil inside the gearbox from leaking into the outside air and causing environmental pollution. At the same time, it can also prevent dust, mud and water from the outside from entering the gearbox. When the vehicle is in wading conditions, once water enters the gearbox, the oil inside the cavity will emulsify, the gears and bearings will wear abnormally, and eventually the vehicle will be unable to continue driving, seriously affecting the riding experience. According to investigations, in most cases, water enters the gearbox from the oil seal area at the connection between the wheel differential axle and the gearbox.

[0003] At present, there are two common types of differential oil seals: Figure 1 It is a conventional spring oil seal, which uses a small interference fit between the inner dust lip and the half shaft to form a seal, but the attached Figure 1 After the half shaft has been running for a period of time, the inner dust lip directly exposed to the outside will be worn out very seriously, and a gap will form between the half shaft and the inner dust lip, which cannot effectively prevent the outside dust, mud and water from entering the main lip area of ​​the oil seal, resulting in seal failure. Figure 2 It is a combination seal of a spring oil seal with an outer dustproof lip and a dust cover. Figure 1 By adding a long dustproof lip on the outside of the oil seal, although it can reduce the dust, mud and water from directly entering the main lip area of ​​the oil seal through the dustproof lip to a certain extent, because the extended dustproof lip and the dust cover adopt a small gap or a small interference fit, as the wear increases, a large gap is formed between the long dustproof lip and the dust cover. When there is a wading condition, some mud and water will still directly pass through the outer dustproof lip and enter the main lip of the oil seal, reducing the sealing effect of the differential oil seal. In addition, because the half-shaft has a large axial movement and radial runout during the working process, the wear of the extended dustproof lip is further increased, resulting in a significant reduction in the service life of the differential oil seal. Therefore, we urgently need to develop a differential oil seal that can achieve long-term sealing and prevent dust, mud and water from entering the gearbox. Utility Model Content

[0004] Technical purpose: In order to overcome the deficiencies in the prior art, the utility model provides a differential oil seal that prevents mud and water from intruding.

[0005] Technical solution: To achieve the above object, a differential oil seal for preventing mud and water intrusion disclosed by the present utility model includes an oil seal main body sleeved on a half shaft and a dust cover connected to the half shaft. An elastic connecting body is connected between the oil seal main body and the dust cover. The oil seal main body includes an oil seal skeleton and a rubber body covering the outside of the oil seal skeleton and contacting with the half shaft to form a seal. The oil seal main body, the dust cover, the elastic connecting body and the half shaft form a first sealing cavity.

[0006] Preferably, the oil seal skeleton is provided with a supporting portion for supporting the rubber body, a clamping portion connected to the elastic connecting body, and a connecting portion connecting the clamping portion and the supporting portion. The clamping portion is provided with a first cavity for accommodating a first end portion of the elastic connecting body.

[0007] Preferably, the dust cover is provided with a dust-proof main board abutting against a second end portion of the elastic connecting body, and a sealing baffle contacting with the half shaft is provided on one side of the dust-proof main board.

[0008] Preferably, the rubber body is provided with a covering body covering the outside of the supporting portion and a sealing body. The sealing body is provided with an inner dust-proof lip contacting with the half shaft on the side close to the first sealing cavity, and a main lip contacting with the half shaft is provided on the side far from the first sealing cavity along the axial direction. The main lip, the inner dust-proof lip and the half shaft form a second sealing cavity.

[0009] Preferably, a flange is provided on the sealing body on the side close to the inner dust-proof lip, and the flange and the covering body form a second cavity for accommodating an end portion of the supporting portion.

[0010] Preferably, the number of the inner dust-proof lips is two groups, and the two groups of inner dust-proof lips and the half shaft form a third sealing cavity.

[0011] Preferably, a set of tightening springs is provided around the side wall of the main lip.

[0012] Preferably, the elastic connecting body is a corrugated pipe.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1. The oil seal main body, the dust cover, the elastic connecting body and the half shaft of the present device form a sealing system. The inner dust-proof lip of the oil seal main body can prevent impurities from entering the main lip area. The main lip can prevent the lubricating oil in the gearbox from leaking or impurities from entering. The elastic connecting body can prevent dust and mud from entering the first sealing cavity, avoiding the accelerated wear of the inner dust-proof lip caused by the entry of dust and mud, and making the main lip seal ineffective, thereby prolonging the service life of the whole set of seals and achieving long-term sealing.

[0015] 2. One end of the elastic connecting body is connected to the oil seal main body, and the other end abuts against the dust cover. By using the pre-compression amount of the elastic connecting body, it can not only avoid poor protection effect caused by gaps generated by axial movement and radial runout during the working process of the half shaft, but also offset the wear amount during the working process of the elastic connecting body, ensuring good sealing performance of the entire sealing system and further extending the service life of this device. Description of the Drawings

[0016] Figure 1 is a cross-sectional view of a conventional spring oil seal in the prior art;

[0017] Figure 2 is a cross-sectional view of a combined seal of a spring oil seal with an outer dust lip and a dust cover in the prior art;

[0018] Figure 3 is a cross-sectional view of the overall structure of the present invention;

[0019] Figure 4 is a cross-sectional view of the oil seal skeleton of the present invention;

[0020] Figure 5 is a cross-sectional view of the rubber body of the present invention;

[0021] Figure 6 is a cross-sectional view of the elastic connecting body of the present invention.

[0022] In the figure, 1. Half shaft; 2. Dust cover; 201. Dust main board; 202. Sealing baffle; 3. Elastic connecting body; 4. Oil seal skeleton; 5. Rubber body; 6. First sealing cavity; 7. Third sealing cavity; 8. Second sealing cavity; 9. Tightening spring; 10. Oil seal main body; 11. Clamping part; 12. Connecting part; 13. Supporting part; 14. First cavity; 15. Coating body; 16. Sealing body; 17. Inner dust lip; 18. Main lip; 19. Flange; 20. Second cavity; 21. First end; 22. Second end. Detailed Embodiment

[0023] The following combines the attached Figure 1 to the attached Figure 6 to describe the principles and features of the present invention. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0024] A differential oil seal for preventing mud and water intrusion, such as Figure 3 — Figure 6As shown in the figure, it includes an oil seal main body 10 sleeved on a half shaft 1 and a dust cover 2 connected to the half shaft 1. An elastic connecting body 3 is provided between the oil seal main body 10 and the dust cover 2. The elastic connecting body 3 can prevent dust and muddy water. In this embodiment, the elastic connecting body 3 is a corrugated pipe. The oil seal main body 10, the dust cover 2, the elastic connecting body 3 and the half shaft 1 form a first sealing cavity 6.

[0025] The oil seal main body 10 includes an oil seal skeleton 4 and a rubber body 5. The oil seal skeleton 4 is provided with a supporting portion 13 for supporting the rubber body 5, a clamping portion 11 connected to the elastic connecting body 3, and a connecting portion 12 connecting the clamping portion 11 and the supporting portion 13. The clamping portion 11 is provided with a first cavity 14 for accommodating the first end portion 21 of the elastic connecting body 3, which can prevent the elastic connecting body 3 from falling off during use. The rubber body 5 is provided with a covering body 15 covering the outside of the supporting portion 13 and a sealing body 16. The sealing body 16 is provided with an inner dust lip 17 in contact with the half shaft 1 on the side close to the first sealing cavity 6, and a main lip 18 in contact with the half shaft 1 on the side far from the first sealing cavity 6 along the axial direction. The main lip 18, the inner dust lip 17 and the half shaft 1 form a second sealing cavity 8. The main lip 18 is mainly used to prevent the lubricating oil in the gearbox from leaking into the external environment, and the inner dust lip 17 is mainly used to prevent external dust and muddy water from passing through the main lip 18 and entering the gearbox, and at the same time can prevent external dust and muddy water from damaging the main lip 18. In order to ensure the sealing effect and extend the service life, the number of the inner dust lips 17 is two groups, which form a third sealing cavity 7 with the half shaft 1. The rubber body 5 is provided with a set of tightening springs 9 around the side wall of the main lip 18.

[0026] In order to prevent cracking between the oil seal skeleton 4 and the rubber body 5 due to poor end covering, the sealing body 16 is provided with a flange 19 on the side close to the inner dust lip 17. The flange 19 and the covering body 15 form a second cavity 20 for accommodating the end portion of the supporting portion 13 to completely cover the end portion of the supporting portion 13.

[0027] The second end portion 22 of the elastic connecting body 3 abuts against the dust-proof main board 201 of the dust cover 2. One side of the dust-proof main board 201 is provided with a sealing baffle 202 in contact with the half shaft 1. During the preliminary assembly process, a certain pre-compression amount is left for the elastic connecting body 3. This part of the pre-compression amount can compensate for the wear amount of the elastic connecting body 3 during the later use process and the axial movement amount of the half shaft 1 during work, so that the second end portion 22 of the elastic connecting body 3 always abuts against the dust-proof main board 201 of the dust cover 2 without generating a gap, which can effectively prevent external dust and muddy water from entering the first sealing cavity 6. And when the half shaft 1 generates radial runout, when the second end portion 22 of the elastic connecting body 3 slides relative to the dust-proof main board 201, due to the existence of the pre-compression amount, better sealing can still be achieved, thereby preventing dust and muddy water from entering the inner dust lip 17 and causing excessive wear to the inner dust lip 17, and extending the service life of the differential oil seal.

[0028] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A differential oil seal for preventing mud and water intrusion, characterized in that: The invention comprises an oil seal body (10) sleeved on a half shaft (1) and a dust cover (2) connected to the half shaft (1); an elastic connecting body (3) is connected between the oil seal body (10) and the dust cover (2); the oil seal body (10) comprises an oil seal skeleton (4) and a rubber body (5) covering the outside of the oil seal skeleton (4) and contacting with the half shaft (1) to form a seal; the oil seal body (10), the dust cover (2), the elastic connecting body (3) and the half shaft (1) form a first sealing cavity (6).

2. The differential oil seal for preventing mud and water intrusion according to claim 1, characterized in that: The oil seal skeleton (4) is provided with a supporting portion (13) for supporting the rubber body (5), a clamping portion (11) connected to the elastic connecting body (3), and a connecting portion (12) connecting the clamping portion (11) and the supporting portion (13); the clamping portion (11) is provided with a first groove cavity (14) for accommodating a first end portion (21) of the elastic connecting body (3).

3. The differential oil seal for preventing mud and water intrusion according to claim 2, characterized in that: The dust cover (2) is provided with a dust main plate (201) abutting against the second end (22) of the elastic connector (3), and one side of the dust main plate (201) is provided with a sealing baffle (202) in contact with the half shaft (1).

4. The differential oil seal for preventing mud and water intrusion according to claim 3, characterized in that: The rubber body (5) is provided with a covering body (15) covering the outside of the supporting portion (13), and a sealing body (16); the sealing body (16) is provided with an inner dust lip (17) in contact with the half shaft (1) on the side close to the first sealing cavity (6), and a main lip (18) in contact with the half shaft (1) is provided on the side away from the first sealing cavity (6) in the axial direction; the main lip (18), the inner dust lip (17) and the half shaft (1) form a second sealing cavity (8).

5. The differential oil seal for preventing mud and water intrusion according to claim 4, characterized in that: The sealing body (16) is provided with a flange (19) on the side close to the inner dust lip (17), and the flange (19) and the covering body (15) form a second groove cavity (20) for accommodating the end of the support portion (13).

6. The differential oil seal for preventing mud and water intrusion according to claim 4, characterized in that: The number of the inner dust lips (17) is two groups, and the two groups of the inner dust lips (17) and the half shaft (1) form a third sealing cavity (7).

7. The differential oil seal for preventing mud and water intrusion according to claim 4, characterized in that: The rubber body (5) is also provided with a group of tightening springs (9) around the side wall of the main lip (18).

8. The differential oil seal for preventing mud and water intrusion according to claim 1, characterized in that: The elastic connecting body (3) is a bellows.

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