A gearbox differential axle oil seal

Abstract

The utility model discloses a kind of gearbox differential semi-axle oil seal, belong to sealing technical field. Including sealing ring body and framework, the framework is covered in sealing ring body, the inner periphery of sealing ring body is sequentially projected with sealing lip, upper dust lip and lower dust lip from top to bottom to the direction of circle center, when the sealing ring body is set on semi-axle, the innermost end of sealing lip, upper dust lip and lower dust lip all contact with the axial surface of semi-axle, the bottom of sealing ring body has side dust lip, the side dust lip gradually inclines to the direction of circle center away from top to bottom. A kind of gearbox differential semi-axle oil seal of the utility model, by two dust lips, air in two directions of horizontal and vertical can be blocked to a certain extent, so that small dust can still enter the inside of oil seal is avoided.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to an oil seal for a gearbox differential half-shaft. Background Technology

[0002] In mechanical transmission systems, seals are crucial components for ensuring stable equipment operation. Oil seals, as a common term for general seals, primarily function to seal lubricating oil. Specifically, as mechanical elements used to seal grease, oil seals effectively isolate the lubricated parts from the output parts in the transmission system. On one hand, this prevents lubricating oil leakage, ensuring the transmission components are always well-lubricated, guaranteeing transmission efficiency and component lifespan. On the other hand, it prevents external contaminants and impurities from entering the equipment cavity, avoiding contamination of the media within the equipment cavity and thus preventing equipment failures caused by media contamination.

[0003] In a vehicle's transmission system, the gearbox differential half-shaft oil seal plays a crucial role; however, it operates in extremely harsh environments. This oil seal is directly connected to both sides of the vehicle's wheels. When the vehicle is in motion, the rotating wheels continuously stir up dust, mud, water, and even sand and other impurities from the road surface. These impurities constantly impact and corrode the gearbox differential half-shaft oil seal, posing a severe challenge to its sealing performance and lifespan.

[0004] To address the impact of the aforementioned impurities, existing technologies typically employ a dust lip design for the oil seal of the transmission differential half-shaft. In this design, the dust lip and half-shaft are fitted with a clearance fit. While this dust lip structure can block some larger particles from entering to a certain extent, fine dust particles can still easily pass through the gap between the dust lip and the half-shaft and enter the oil seal. With prolonged vehicle use, this fine dust accumulates inside the oil seal, and once it reaches a certain level, it further diffuses and adheres to the sealing lip of the oil seal.

[0005] As the core component of an oil seal, the sealing lip's surface condition directly determines its sealing effect. Dust adhering to the sealing lip acts as an abrasive during the relative movement between the oil seal and the half-shaft, accelerating wear between them and leading to excessive wear of the sealing ring. When the sealing ring wear exceeds the allowable range, its sealing performance drops sharply, ultimately causing oil seal failure and lubricant leakage. Lubricant leakage not only wastes oil but also leads to insufficient lubrication within the transmission differential, accelerating wear on transmission components. In severe cases, it can even cause transmission differential failure, affecting normal vehicle operation and resulting in significant maintenance costs and safety hazards for users.

[0006] Therefore, it is necessary to provide a gearbox differential half-shaft oil seal to solve the above problems. Utility Model Content

[0007] Based on the aforementioned problems in the existing technology, the purpose of this utility model is to provide a gearbox differential half-shaft oil seal to solve the problems mentioned in the background art.

[0008] The technical solution adopted by this utility model to solve its technical problem is: a gearbox differential half-shaft oil seal, including a sealing ring body and a skeleton, the skeleton being covered within the sealing ring body, the inner circumferential surface of the sealing ring body having a sealing lip, an upper dustproof lip and a lower dustproof lip protruding sequentially from top to bottom towards the center, when the sealing ring body is fitted onto the half-shaft, the innermost ends of the sealing lip, the upper dustproof lip and the lower dustproof lip are all in contact with the axial surface of the half-shaft, the bottom of the sealing ring body has a side dustproof lip, the side dustproof lip gradually tilting away from the center from top to bottom.

[0009] Furthermore, the length of the side dustproof lip is greater than the lengths of the upper and lower dustproof lips.

[0010] Furthermore, a connecting portion is provided between the upper dustproof lip and the lower dustproof lip. The top end of the connecting portion is the root of the lower surface of the upper dustproof lip, and the bottom end of the connecting portion is the root of the upper surface of the lower dustproof lip. Both the top end and the bottom end of the connecting portion are located within the circumferential extension range of the upper dustproof lip.

[0011] Furthermore, an angle α is formed between the lower surface of the upper dustproof lip and the upper surface of the lower dustproof lip.

[0012] Furthermore, the skeleton has a transition section located above the side dust lip.

[0013] Furthermore, the frame also has a vertical section and an extension section, the transition section is located between the vertical section and the extension section, the upper surface extension surface of the end of the extension section is surface a, which is flush with the top of the connecting part, and the lower surface extension surface is surface b, which is flush with the bottom of the connecting part.

[0014] Furthermore, a clamping spring is also fitted onto the sealing ring body, and the clamping spring is close to the sealing lip.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a gearbox differential half-shaft oil seal. The oil seal contacts the shaft surface through a sealing lip, an upper dustproof lip, and a lower dustproof lip, which can simultaneously support the half-shaft, avoid the generation of gaps, and prevent dusty air from entering through the lower dustproof lip. By providing a side dustproof lip, it can prevent most of the dusty air from entering outside the half-shaft. The two dustproof lips can respectively block air in the horizontal and vertical directions to a certain extent, thereby preventing fine dust from still entering the oil seal. By setting the upper and lower dustproof lips at a certain angle, a certain error is allowed when installing the half shaft, thus avoiding excessive wear between the sealing ring and the half shaft. The transition section supports the side dust lip, and the extension section supports the upper and lower dust lip, ensuring that the lip can fit the shaft surface at the optimal angle, forming a more stable seal and preventing the sealing ring from deforming or shifting due to its own softness or the rotational force of the shaft.

[0016] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 For the present utility model Figure 2 Enlarged diagram of area A in the middle; Figure 4 This is a schematic cross-sectional view of the skeleton of this utility model; Figure 5 This is a schematic diagram of the half-shaft installation of this utility model; The following are the labeling elements in the figure: 1. Sealing ring body; 11. Sealing lip; 12. Upper dustproof lip; 13. Lower dustproof lip; 14. Side dustproof lip; 15. Connecting part; 2. Skeleton; 21. Vertical section; 22. Transition section; 23. Extension section; 3. Hoop spring. Detailed Implementation

[0018] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0020] like Figure 1-5 As shown, this utility model provides a technical solution: a gearbox differential half-shaft oil seal, including a sealing ring body 1 and a skeleton 2. The skeleton 2 is enclosed within the sealing ring body 1. The inner circumferential surface of the sealing ring body 1 has a sealing lip 11, an upper dustproof lip 12, and a lower dustproof lip 13 protruding sequentially from top to bottom towards the center. When the sealing ring body 1 is fitted onto the half-shaft, the innermost ends of the sealing lip 11, the upper dustproof lip 12, and the lower dustproof lip 13 are all in contact with the axial surface of the half-shaft. The bottom of the sealing ring body 1 has a side dustproof lip 14, which gradually slopes away from the center from top to bottom. When the sealing lip 11 contacts the outer wall of the half-shaft, the upper dustproof lip 12 and the lower dustproof lip 13 also simultaneously contact the outer wall of the half-shaft, thereby preventing dust in the longitudinal direction from being carried in by the air. The side dustproof lip 14 prevents dust in the transverse direction from being carried in by the air.

[0021] The length of the side dust lip 14 is greater than the lengths of the upper dust lip 12 and the lower dust lip 13.

[0022] A connecting portion 15 is provided between the upper dustproof lip 12 and the lower dustproof lip 13. The top end of the connecting portion 15 is the root of the lower surface of the upper dustproof lip 12, and the bottom end of the connecting portion 15 is the root of the upper surface of the lower dustproof lip 13. Both the top end and the bottom end of the connecting portion 15 are located within the circumferential extension range of the upper dustproof lip 12.

[0023] An angle α is formed between the upper surface of the upper dust lip 12 and the lower surface of the lower dust lip 13. α is greater than 0°, which makes demolding easier during production.

[0024] The frame 2 has a transition section 22, which is located above the side dust lip 14. This improves the support of the side dust lip 14.

[0025] The frame 2 also has a vertical section 21 and an extension section 23. A transition section 22 is located between the vertical section 21 and the extension section 23. The upper surface extension surface of the end of the extension section 23 is surface a, which is flush with the top of the connecting part 15. The lower surface extension surface is surface b, which is flush with the bottom of the connecting part 15. This improves the support force at the base of the upper dustproof lip 12 and the lower dustproof lip 13.

[0026] A clamping spring 3 is also fitted on the sealing ring body 1, and the clamping spring 3 is close to the sealing lip 11.

[0027] In one embodiment, the multi-lip seal operates on the following principle:

[0028] Specifically, the sealing ring body 1 is installed on the half shaft. The clamping spring 3 makes the sealing ring body 1 and the half shaft more tightly connected. The sealing lip 11, the upper dustproof lip 12 and the lower dustproof lip 13 all abut against the outer surface of the half shaft. The upper dustproof lip 12 and the lower dustproof lip 13 are offset to produce a certain angle, so that a certain error is allowed when the half shaft is fitted. This avoids accelerated wear due to inaccurate positioning during operation and reduces service life. It can block the air with dust on the outside of the lower dustproof lip 13 from entering. The side dustproof lip 14 blocks most of the air with dust on the outside of the half shaft from entering. The transition section 22 of the skeleton 2 provides some support to the side dust lip 14, and the end of the extension section 23 is located between the connecting parts 15, which can increase the support of the upper dust lip 12 and the lower dust lip 13.

[0029] In summary, the oil seal contacts the shaft surface through the sealing lip 11, the upper dustproof lip 12, and the lower dustproof lip 13, holding the half shaft against it and preventing the formation of gaps. It can prevent dusty air from entering through the lower dustproof lip 13. The side dustproof lip 14 can prevent most dusty air from entering outside the half shaft. The two dustproof lips can block air in the horizontal and vertical directions to a certain extent, thus preventing fine dust from entering the oil seal. By setting the upper dustproof lip 12 and the lower dustproof lip 13 to be offset at a certain angle, demolding is easier during production; The transition section 22 supports the side dustproof lip 14, and the extension section 23 supports the upper dustproof lip 12 and the lower dustproof lip 13, ensuring that the lip can fit the shaft surface at the optimal angle to form a more stable seal and prevent the sealing ring from deforming or shifting due to its own softness or the rotational force of the shaft.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gearbox differential half-shaft oil seal, characterized in that: The device includes a sealing ring body (1) and a skeleton (2). The skeleton (2) is enclosed within the sealing ring body (1). The inner circumferential surface of the sealing ring body (1) has a sealing lip (11), an upper dustproof lip (12), and a lower dustproof lip (13) protruding from top to bottom toward the center. When the sealing ring body (1) is fitted onto the half shaft, the innermost ends of the sealing lip (11), the upper dustproof lip (12), and the lower dustproof lip (13) are in contact with the axial surface of the half shaft. The bottom of the sealing ring body (1) has a side dustproof lip (14), which gradually tilts away from the center from top to bottom.

2. The gearbox differential half-shaft oil seal according to claim 1, characterized in that: The length of the side dustproof lip (14) is greater than the lengths of the upper dustproof lip (12) and the lower dustproof lip (13).

3. The gearbox differential half-shaft oil seal according to claim 2, characterized in that: There is a connecting part (15) between the upper dustproof lip (12) and the lower dustproof lip (13). The top end of the connecting part (15) is the root of the lower surface of the upper dustproof lip (12), and the bottom end of the connecting part (15) is the root of the upper surface of the lower dustproof lip (13). The top end and the bottom end of the connecting part (15) are both located within the circumferential extension range of the upper dustproof lip (12).

4. The gearbox differential half-shaft oil seal according to claim 1, characterized in that: An angle α is formed between the lower surface of the upper dustproof lip (12) and the upper surface of the lower dustproof lip (13).

5. The gearbox differential half-shaft oil seal according to claim 1, characterized in that: The skeleton (2) has a transition section (22) located above the side dust lip (14).

6. The gearbox differential half-shaft oil seal according to claim 3, characterized in that: The frame (2) also has a vertical section (21) and an extension section (23). The transition section (22) is located between the vertical section (21) and the extension section (23). The upper surface extension surface of the end of the extension section (23) is surface a, which is flush with the top of the connecting part (15). The lower surface extension surface is surface b, which is flush with the bottom of the connecting part (15).

7. The gearbox differential half-shaft oil seal according to claim 1, characterized in that: A clamping spring (3) is also fitted on the sealing ring body (1), and the clamping spring (3) is close to the sealing lip (11).

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