Sealing assembly for balancing the pressure inside and outside a bearing

Abstract

The utility model discloses a sealing assembly of balanced bearing inner and outer air pressure, including first sealing ring and second sealing ring, first sealing ring is sleeved on the bearing inner race, and second sealing ring is sleeved on first sealing ring, and the outer ring surface of second sealing ring is in abutment with the bearing outer ring, and the section of first sealing ring is L type, and second sealing ring includes ring body and the sealing lip of setting on the ring body end face, and the inner ring wall of ring body is in abututment on first sealing ring horizontal ring face, and the sealing lip is in abututment on first sealing ring vertical ring face, and the ring body is opened with the air hole, to communicate the inside and outside two ends of ring body. The utility model discloses through L type first sealing ring and the cooperation of second sealing ring with sealing lip, utilizes ring body air hole to realize the air pressure balance of bearing inside and outside, avoids the sealing failure of pressure difference and promotes bearing operation stability and service life.

Description

Technical Field

[0001] This utility model relates to the field of bearing sealing technology, and more specifically to a sealing component that balances the internal and external air pressure of a bearing. Background Technology

[0002] Sealed bearings have a wide range of applications. However, when bearings are transported from low-altitude to high-altitude areas, or vice versa, or when friction generates heat after the bearing has been in operation, various conditions can cause changes in the internal and external air pressure of the bearing, resulting in an imbalance. Furthermore, when the internal or external air pressure of the bearing reaches a critical point, the bearing may experience grease leakage, decreased sealing performance, or even seal cap detachment. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a sealing component that balances the internal and external air pressure of a bearing. By setting a vent structure on the sealing component, the internal and external air pressure of the bearing can be automatically balanced, thus solving the problems of grease leakage, decreased sealing performance, and sealing cap detachment caused by air pressure changes.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a sealing assembly for balancing the internal and external air pressure of a bearing, comprising a first sealing ring and a second sealing ring. The first sealing ring is fitted onto the inner ring of the bearing, and the second sealing ring is fitted onto the first sealing ring. The outer ring surface of the second sealing ring abuts against the outer ring of the bearing. The cross-section of the first sealing ring is L-shaped. The second sealing ring includes a ring body and a sealing lip disposed on the end face of the ring body. The inner ring wall of the ring body abuts against the horizontal ring surface of the first sealing ring, and the sealing lip abuts against the vertical ring surface of the first sealing ring. A vent hole is provided on the ring body to connect the inner and outer ends of the ring body.

[0005] As a further improvement of this utility model, the sealing lip forms an inner cavity and an outer cavity between the first sealing ring and the ring body. The inner cavity is closed by the sealing lip, and the outer cavity is normally open to the outside of the bearing. The vent hole includes an inner-to-outer vent hole and an outer-to-inner vent hole. The inner-to-outer vent hole is located near the inner cavity of the ring body and connects the inside of the bearing with the inner cavity. The outer-to-inner vent hole is located near the outer cavity of the ring body and connects the outer cavity with the inside of the bearing.

[0006] As a further improvement of this utility model, the outer ring wall of the ring body extending towards the first sealing ring has an outer ring sealing edge. The outer side of the outer ring sealing edge abuts against the outer ring of the bearing. The outer ring of the bearing has a sealing edge coaxially arranged at the end facing the inside of the bearing. An annular outer ring vent groove is opened on the inner ring wall of the bearing near the sealing edge. The outer-to-inner vent hole includes a first hole and a second hole. When the external air pressure of the bearing is greater than the internal air pressure, the ring body moves towards the inside of the bearing and abuts against the sealing edge. The first hole connects the outer cavity and the outer ring vent groove, and the second hole connects the outer ring vent groove and the inside of the bearing. When the internal air pressure of the bearing is greater than the external air pressure, the ring body moves away from the sealing edge, the first hole is closed, and the sealing lip is opened by the air pressure, so that the inside of the bearing, the inner-to-outer vent hole, the inner cavity and the outer cavity are connected.

[0007] As a further improvement of this utility model, the ring body is made by wrapping elastic rubber on a rigid part. The rubber surface abuts against the outer ring of the bearing, and an abutment edge composed of elastic rubber is formed between the rigid part and the sealing edge. The first hole is opened on the rigid part and penetrates the rubber surface, and the second hole is opened on the abutment edge.

[0008] The beneficial effects of this invention are achieved through the cooperation of a first sealing ring with an L-shaped cross-section and a second sealing ring with a sealing lip, combined with the vent design on the ring body, realizing bidirectional automatic balance of internal and external air pressure in the bearing. When the internal and external air pressure of the bearing is unbalanced, the selective conduction of the vent and the elastic deformation of the sealing lip can quickly balance the air pressure while ensuring sealing performance, effectively solving the problems of grease leakage and seal failure caused by air pressure changes in traditional bearings. Furthermore, the dual vent structure and the movable ring design enable intelligent switching under different air pressure conditions, improving the adaptability of the sealing component; the rubber-coated structure of the rigid parts balances structural strength and sealing reliability. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the sealing assembly for balancing the internal and external air pressure of the bearing according to this utility model. Figure 2 This is a schematic diagram of airflow where the external air pressure is greater than the internal air pressure of the bearing. Figure 3 This is a schematic diagram of airflow where the air pressure outside the bearing is lower than the air pressure inside the bearing. Detailed Implementation

[0010] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0011] Reference Figure 1As shown, the sealing assembly for balancing the internal and external air pressure of the bearing in this embodiment includes a first sealing ring 1 and a second sealing ring 2. The first sealing ring 1 is fitted onto the inner ring of the bearing, and the second sealing ring 2 is fitted onto the first sealing ring 1. The outer ring surface of the second sealing ring 2 abuts against the outer ring of the bearing. The cross-section of the first sealing ring 1 is L-shaped. The second sealing ring 2 includes a ring body 21 and a sealing lip 22 disposed on the end face of the ring body 21. The inner ring wall of the ring body 21 abuts against the horizontal ring surface of the first sealing ring 1, and the sealing lip 22 abuts against the vertical ring surface of the first sealing ring 1. A vent hole is provided on the ring body 21 to connect the inner and outer ends of the ring body 21. When the bearing is transported from a low altitude to a high altitude area or when the internal and external air pressure changes due to frictional heat, the vent hole can facilitate air pressure conduction, preventing the sealing cap from falling off due to excessive internal air pressure. When the external air pressure is higher than the internal pressure, air is supplied to the inside through the vent hole to prevent excessive external pressure from causing sealing failure, thereby solving the problems of grease leakage and decreased sealing performance caused by air pressure imbalance in traditional bearings.

[0012] Furthermore, refer to Figure 1 As shown, the sealing lip 22 forms an inner chamber and an outer chamber between the first sealing ring 1 and the ring body 21. The inner chamber is sealed by the sealing lip 22, while the outer chamber is normally open to the outside of the bearing. The vent holes include an inner-to-outer vent hole 3 and an outer-to-inner vent hole 4. The inner-to-outer vent hole 3 is located on the ring body 21 near the inner chamber, connecting the inside of the bearing to the inner chamber. The outer-to-inner vent hole 4 is located on the ring body 21 near the outer chamber, connecting the outer chamber to the inside of the bearing. This dual-vent hole design achieves bidirectional air pressure regulation. When the internal air pressure is too high, the inner-to-outer vent hole 3 opens to release pressure; when the external air pressure is too high, the outer-to-inner vent hole 4 replenishes air to balance the pressure. Compared with the traditional unidirectional sealing structure, it has a more comprehensive air pressure balancing capability.

[0013] Furthermore, refer to Figure 2 , 3As shown, the outer ring wall of the ring body 21 extending towards the first sealing ring 1 has an outer ring sealing edge 23. The outer side of the outer ring sealing edge 23 abuts against the outer ring of the bearing. The outer ring of the bearing is coaxially provided with a sealing edge 5 at one end facing the inside of the bearing. An annular outer ring vent groove 6 is provided on the inner ring wall of the bearing near the sealing edge 5. The outer-to-inner vent hole 4 includes a first hole 41 and a second hole 42. When the external air pressure of the bearing is greater than the internal air pressure, the ring body 21 moves towards the inside of the bearing and abuts against the sealing edge 5. The first hole 41 connects the outer chamber and the outer ring vent groove 6, and the second hole 42 connects the outer ring vent groove 6 and the inside of the bearing. When the internal air pressure of the bearing is greater than the external air pressure, the ring body 21 moves away from the sealing edge 5, the first hole 41 is closed, and the sealing lip 22 is opened by the air pressure, so that the inside of the bearing, the inner-to-outer vent hole 3, the inner chamber and the outer chamber are connected. By utilizing the translational characteristics of the ring 21 and the dual-hole switching mechanism, adaptive adjustment under different air pressure conditions is achieved. It can intelligently respond to air pressure changes without the need for additional control components, thereby improving the working reliability of the sealing assembly.

[0014] Furthermore, refer to Figure 1 As shown, the ring 21 is made by wrapping an elastic rubber layer around a rigid component. The rubber surface abuts against the outer ring of the bearing, and a contact edge composed of elastic rubber is formed between the rigid component and the sealing edge 5. A first hole 41 is formed on the rigid component and penetrates the rubber surface, while a second hole 42 is formed on the contact edge. The rigid component ensures the structural strength of the ring 21, while the elastic rubber layer provides excellent sealing performance and cushioning. The elastic deformation characteristics of the contact edge ensure the sealing reliability of the ring 21 during translation. Compared to all-metal or all-rubber structures, it has a longer service life and a more stable sealing effect. Furthermore, even when the sealing component experiences slight translation, the elasticity of the rubber layer ensures a consistent sealing effect.

[0015] In summary, this invention achieves dynamic balance of internal and external air pressure in the bearing by using an L-shaped first sealing ring in conjunction with a second sealing ring with a vent hole. This effectively solves problems such as grease leakage and seal failure caused by air pressure changes, and improves the reliability and service life of the bearing under different operating conditions.

[0016] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A sealing assembly for balancing internal and external air pressure of a bearing, comprising a first sealing ring (1) and a second sealing ring (2), wherein the first sealing ring (1) is fitted onto the inner ring of the bearing, and the second sealing ring (2) is fitted onto the first sealing ring (1), and the outer ring surface of the second sealing ring (2) abuts against the outer ring of the bearing, characterized in that: The first sealing ring (1) has an L-shaped cross section. The second sealing ring (2) includes a ring body (21) and a sealing lip (22) disposed on the end face of the ring body (21). The inner ring wall of the ring body (21) abuts against the horizontal ring surface of the first sealing ring (1), and the sealing lip (22) abuts against the vertical ring surface of the first sealing ring (1). A vent hole is provided on the ring body (21) to connect the inner and outer ends of the ring body (21).

2. The sealing assembly for balancing internal and external air pressure of the bearing according to claim 1, characterized in that: The sealing lip (22) forms an inner chamber and an outer chamber between the first sealing ring (1) and the ring body (21). The inner chamber is closed by the sealing lip (22), and the outer chamber is normally open to the outside of the bearing. The vent hole includes an inner-to-outer vent hole (3) and an outer-to-inner vent hole (4). The inner-to-outer vent hole (3) is located on the ring body (21) near the inner chamber and connects the inside of the bearing with the inner chamber. The outer-to-inner vent hole (4) is located on the ring body (21) near the outer chamber and connects the outer chamber with the inside of the bearing.

3. The sealing assembly for balancing internal and external air pressure of the bearing according to claim 2, characterized in that: The outer ring wall of the ring body (21) extending towards the first sealing ring (1) has an outer ring sealing edge (23). The outer side of the outer ring sealing edge (23) abuts against the outer ring of the bearing. The outer ring of the bearing is coaxially provided with a sealing edge (5) at one end facing the inside of the bearing. An annular outer ring vent groove (6) is provided on the inner ring wall of the bearing near the sealing edge (5). The outer to inner vent hole (4) includes a first hole (41) and a second hole (42). When the external air pressure of the bearing is greater than the internal air pressure, the vent hole is opened. When the air pressure is greater than the external air pressure, the ring (21) moves towards the inside of the bearing and abuts against the sealing edge (5). The first hole (41) connects the outer chamber and the outer ring vent groove (6), and the second hole (42) connects the outer ring vent groove (6) and the inside of the bearing. When the air pressure inside the bearing is greater than the external air pressure, the ring (21) moves away from the sealing edge (5), the first hole (41) is closed, and the sealing lip (22) is opened by the air pressure, so that the inside of the bearing, the inner to outer vent hole (3), the inner chamber and the outer chamber are connected.

4. The sealing assembly for balancing internal and external air pressure of the bearing according to claim 3, characterized in that: The ring (21) is made by wrapping elastic rubber on a rigid part. The rubber surface abuts against the outer ring of the bearing, and an abutment edge composed of elastic rubber is formed between the rigid part and the sealing edge (5). The first hole (41) is opened on the rigid part and penetrates the rubber surface, and the second hole (42) is opened on the abutment edge.

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