Small size wear resistant gas seal

Abstract

The utility model discloses a small size wear -resisting air seal spare, including framework and the inner sealing lip of attaching on this framework, the air seal spare width is less than or equal to 8mm, the gasket with annular between the inner sealing lip and framework has, the gasket is located the inner sealing lip lip mouth part's axial outside, for separating the corresponding part of inner sealing lip with framework. Adopt gasket structure, can directly add in the vulcanization process, after vulcanization, do not have to cut again, product shaping, the part of inner sealing lip is in the free state with gasket, its actual fixed support point is with the sticking part of framework, both satisfy the use demand of reducing friction, and the process difficulty is reduced, need not secondary processing, convenient implementation and batch production.

Description

Technical Field

[0001] This utility model belongs to the field of sealing structures, specifically relating to a small-sized wear-resistant gas seal component. Background Technology

[0002] A central tire inflation / deflation system is a system that can detect and adjust tire pressure at any time while the car is in motion or stationary. When a car is driving on complex road surfaces such as deserts, grasslands, swamps, and mud, this system can adjust tire pressure in real time. By controlling the air pressure in each tire, it can improve the car's driving performance on different road surfaces, meet the different tire pressure requirements of different road surfaces, and greatly improve the car's passability.

[0003] The applicant found in the research that most of the oil-gas seal lip structures in the current oil-gas seal structure are made of polytetrafluoroethylene (PTFE), which is basically inelastic. The interference fit is large during initial installation, which results in a large clamping force on the shaft. This increases the frictional torque between the sealing lip and the drive shaft, thus increasing the starting torque. The frictional torque can only be reduced after a long period of friction. Furthermore, because this type of sealing lip needs to be continuously broken in with the drive shaft, the probability of air leakage is relatively high in the early stage. Only after wear and tighter fit with the shaft can a better seal be achieved.

[0004] Therefore, the applicant filed a patent application with patent number "CN221723406U" entitled "Gas Seal of Gas-filling and degassing System" in the early stage. It mainly adopts the method of setting a free "fitting section" to improve the degree of freedom of the lip part and reduce the friction with the internal parts. In the actual production process, the "fitting section" is mainly formed by cutting. That is, initially the sealing lip and the skeleton are vulcanized as a whole, and then the designated part is cut to separate it from the skeleton to form the fitting section.

[0005] Further research revealed that the operation method corresponding to the above structure is more suitable for larger-sized seals. However, when the size of the seal (generally less than 8mm in width) is small, the cutting operation is difficult to implement, and the process difficulty increases. Under the requirement of small size, the cost and difficulty of achieving the same purpose based on the above structure are greatly increased. Utility Model Content

[0006] In view of this, the present invention provides a small-sized wear-resistant gas seal to solve the problem of difficult processing of small-sized wear-resistant gas seals with reduced clamping force in the prior art.

[0007] The technical solution is as follows:

[0008] A small-sized wear-resistant gas seal includes a skeleton and an inner sealing lip attached to the skeleton. The width of the gas seal is less than or equal to 8 mm. The key feature is that there is an annular gasket between the inner sealing lip and the skeleton. The gasket is located on the axial outer side of the lip opening of the inner sealing lip and is used to separate the corresponding part of the inner sealing lip from the skeleton.

[0009] By adopting the above solution, during the vulcanization process, it is only necessary to fix the position of the gasket and the skeleton relative to each other, and then apply adhesive to the corresponding surface of the skeleton. No adhesive is needed on the surface of the gasket. After the product is formed, the inner sealing lip is in a state of separation from the gasket. Its actual fixed support point is the part that is bonded to the skeleton. This not only meets the requirements of reducing friction, but also reduces the difficulty of the process. No secondary processing is required, making it easy to implement. Furthermore, the gasket structure makes it easier to mass-produce.

[0010] Preferably, the inner diameter of the gasket is larger than the inner diameter of the part of the inner sealing lip that comes into contact with it. Using this design, a certain space for storing the sealing medium can be formed at this location, improving the overall sealing performance.

[0011] Preferably, the inner diameter of the gasket is greater than or equal to the inner diameter of the skeleton. This design facilitates positioning during manufacturing and avoids impacts on the gasket during use.

[0012] Preferably, the inner sealing lip has a first lip and a second lip arranged sequentially on the same side of the skeleton along the axial direction, and the inner diameter of the second lip is smaller than that of the first lip; a storage cavity is formed between the first lip and the second lip. With this design, the storage cavity is used to fill the sealing medium, which can retain the sealing medium for a longer period of time, extending its service life.

[0013] Preferably, the maximum diameter of the storage cavity is less than or equal to the inner diameter of the part where the inner sealing lip contacts the gasket. This design creates a stepped sealing structure from the inside out, which improves sealing performance and durability.

[0014] Preferably, the inner sealing lip has an integrally vulcanized embedded spring ring on its axial inner side.

[0015] By adopting the above solutions, space usage and production processes can be saved.

[0016] Preferably, the skeleton has an "L"-shaped cross-section with an outer sealing lip on its radially outer side, and the outer sealing lip and the inner sealing lip are integrally vulcanized. Using this method, the integral molding of the inner and outer sealing lips provides better overall sealing performance and strength.

[0017] Preferably, the gasket thickness is 0.2mm-0.5mm. This design avoids the gasket being too thick, which could cause excessive looseness in the inner sealing lip and helps maintain the overall posture.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] The small-sized wear-resistant gas seal provided by this utility model adopts a gasket structure, which can be directly added during the vulcanization process. After vulcanization, there is no need to cut it. After the product is formed, the inner sealing lip is in a free state from the gasket. Its actual fixed support point is the part that is bonded to the skeleton. This not only meets the use requirement of reducing friction, but also reduces the process difficulty, eliminates the need for secondary processing, and is easy to implement. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the structure of this utility model. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] refer to Figure 1 The small-sized wear-resistant gas seal shown includes a skeleton 1 and an inner sealing lip 2 attached to the skeleton 1. The width (i.e., axial thickness) of the gas seal is less than or equal to 8 mm. The key feature of this application is that there is an annular gasket 3 between the inner sealing lip and the skeleton 1. The gasket 3 is located on the axial outer side of the lip opening of the inner sealing lip and is used to separate the corresponding part of the inner sealing lip 2 from the skeleton 1. The gasket 3 is integrally vulcanized with the skeleton 1 and the inner sealing lip 2.

[0023] As shown in the figure, in this embodiment, the half-side cross-section of the skeleton 1 is generally L-shaped, that is, it includes at least an axial extension 10 and a radial extension 11. The axial extension 10 is located on the radially outer side of the radial extension 11 and on the axially inner side relative to the radial extension 11. During manufacturing, the axial extension 10 and the radial extension 11 are integrally formed.

[0024] The inner sealing lip 2 is bonded at least partially to the inner side of the radial extension 11 and the inner side of the axial extension 10. The point closest to the center of the bonding part between the inner sealing lip 2 and the radial extension 11 is called the support point A (actually a line). There is a certain gap between the support point A and the inner side of the radial extension 11, and the gasket 3 is located within this gap. Accordingly, the inner sealing lip and the gasket 3 are in a fitted posture within this range. When the inner sealing lip 3 is subjected to radially outward compressive force, it can shift outward with the support point A as the center, thereby avoiding friction.

[0025] In this embodiment, the inner diameter of the gasket 3 is larger than the inner diameter of the inner sealing lip 2 and its contact portion. In other words, the axial inner contact portion of the inner sealing lip 2 and the gasket 3 does not protrude to the radial inner side of the gasket 3. The closest point of this contact portion to the center is point B, whose corresponding inner diameter is D1. The inner diameter of the gasket 3 is D2, and its outer diameter is D3. Therefore, D2 < D1 < D3. Furthermore, the inner diameter of the gasket 3 is greater than or equal to the inner diameter of the skeleton 1, so that it can be within the protection range of the skeleton to prevent the gasket 3 from being damaged by collision.

[0026] In this embodiment, to achieve airtightness, the inner sealing lip 2 has a first lip 4 and a second lip 5 arranged sequentially on the same side of the axial direction of the skeleton 1, and the inner diameter of the second lip 5 is smaller than that of the first lip 4. The first lip 4 and the second lip 5 form a storage cavity 6. The maximum diameter of the storage cavity 6 is less than or equal to the inner diameter of the part where the inner sealing lip and the gasket 3 are in contact.

[0027] Based on this, the first lip 4 and the stop point B adopt a beveled shape, thus forming a second storage cavity 9 between the lip and the gasket 3. In order to improve the overall sealing performance, in this embodiment, R1 is larger than the inner diameter of the storage cavity 6, thereby forming a stepped sealing structure, which further improves the sealing performance. During use, the sealing medium can penetrate between the inner sealing lip and the mating surface of the gasket 3, reducing wear.

[0028] As shown in the figure, the inner sealing lip 2 has an integrally vulcanized embedded spring ring 7 on its axial inner side. In addition, the skeleton 1 has an outer sealing lip 8 on its radial outer side, and the outer sealing lip 8 is integrally vulcanized with the inner sealing lip 2.

[0029] Within a small size range, without affecting the overall strength of the inner sealing lip, the thickness of gasket 3 is 0.2mm-0.5mm, adjusted according to its axial extension thickness.

[0030] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A small-sized wear-resistant gas seal, comprising a skeleton (1) and an inner sealing lip (2) attached to the skeleton (1), wherein the width of the gas seal is less than or equal to 8 mm, characterized in that: There is an annular gasket (3) between the inner sealing lip and the skeleton (1). The gasket (3) is located on the axial outer side of the lip opening of the inner sealing lip and is used to separate the corresponding part of the inner sealing lip (2) from the skeleton (1).

2. The small-sized wear-resistant gas seal according to claim 1, characterized in that: The inner diameter of the gasket (3) is larger than the inner diameter of the inner sealing lip (2) and the part that it contacts.

3. The small-sized wear-resistant gas seal according to claim 1 or 2, characterized in that: The inner diameter of the gasket (3) is greater than or equal to the inner diameter of the skeleton (1).

4. The small-sized wear-resistant gas seal according to claim 1 or 2, characterized in that: The inner sealing lip (2) has a first lip (4) and a second lip (5) arranged sequentially on the same side of the skeleton (1) along the axial direction, and the inner diameter of the second lip (5) is smaller than that of the first lip (4); the first lip (4) and the second lip (5) form a storage cavity (6).

5. The small-sized wear-resistant gas seal according to claim 4, characterized in that: The maximum diameter of the storage cavity (6) is less than or equal to the inner diameter of the part where the inner sealing lip and the gasket (3) fit together.

6. The small-sized wear-resistant gas seal according to claim 1 or 2, characterized in that: The inner sealing lip (2) has an integrally vulcanized embedded spring ring (7) on its axial inner side.

7. The small-sized wear-resistant gas seal according to claim 1 or 2, characterized in that: The skeleton (1) has an "L" shaped cross section and an outer sealing lip (8) on its radial outer side. The outer sealing lip (8) and the inner sealing lip (2) are integrally vulcanized.

8. The small-sized wear-resistant gas seal according to claim 1 or 2, characterized in that: The thickness of the gasket (3) is 0.2mm-0.5mm.

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