Large combined oil gas seal for hub

Abstract

The utility model relates to a large combined oil gas seal for a hub, which comprises a T-shaped metal framework with an annular structure, the cross section of the T-shaped metal framework is of a T-shaped structure, and the T-shaped metal framework comprises a vertical section and a horizontal section extending from the middle of the vertical section to the annular center; the main lip sealing group comprises two main lip sealing bodies which are arranged on the horizontal section of the T-shaped metal framework and are symmetrical to each other; the auxiliary lip sealing set comprises two L-shaped ring frames and two auxiliary lip sealing bodies, and the two L-shaped ring frames are arranged on the two sides of the junction of the vertical section and the horizontal section of the T-shaped metal framework correspondingly; and the two secondary lip sealing bodies are respectively arranged on the horizontal arms of the two corresponding groups of L-shaped ring frames. The sealing device is compact in structure, clear in sealing layer and suitable for sealing requirements of large mine car hubs and the like under high-temperature, high-pressure and high-speed rotating working conditions.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a large combined oil-gas seal for wheel hubs. Background Technology

[0002] In large civilian mining trucks, the wheel hub, as a key component, bears and supports the vehicle's weight, transmits power, absorbs and cushions vibrations, ensures handling and stability, and dissipates heat. To adapt to various harsh and complex road conditions, mining trucks are typically equipped with a central tire inflation / deflation system, which adjusts tire pressure to improve vehicle passability or reduce fuel consumption. For example, in areas with low friction, such as mountains, swamps, snow, or gravel, tire pressure is reduced to increase the contact area between the tire and the ground; when driving on paved roads, tire pressure is increased to reduce the contact area, thereby reducing fuel consumption and ensuring stability at high speeds.

[0003] Effective sealing devices are essential for the normal operation of wheel hubs to prevent oil leakage and isolate them from external dust and moisture. This is especially crucial in large mining cars where wheel hubs are large (up to 1 meter in diameter) and operate in harsh environments, requiring seals to withstand high temperatures, high-speed rotation, and extreme temperatures. However, existing seals have several shortcomings in addressing these challenges: First, insufficient sealing performance: Traditional seals degrade under high temperatures and high-speed rotation, leading to oil leakage or the entry of external impurities into the wheel hub, causing irreversible damage. Second, complex structure: Existing seals have complex designs, making installation and maintenance difficult and hindering rapid repair and maintenance of mining cars. Third, limited temperature resistance: Traditional seals struggle to maintain stable sealing performance across a wide temperature range of -45℃ to 150℃, failing to meet the requirements of mining cars operating in extremely cold or high-temperature environments.

[0004] Therefore, developing a high-performance combined oil-gas seal that can meet the wheel hub sealing requirements of large mining vehicles has significant practical and economic value. Summary of the Invention

[0005] The purpose of this invention is to provide a large combined oil-gas seal for wheel hubs, which can at least solve the problems of insufficient sealing performance, unstable structure, and difficulty in installation of existing oil-gas seals under high temperature, high speed and extreme environments.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A large combined oil-gas seal for wheel hubs, comprising:

[0008] A ring-shaped T-shaped metal skeleton, wherein the cross-section of the T-shaped metal skeleton is T-shaped, including a vertical segment and a horizontal segment extending from the middle of the vertical segment to the center of the ring;

[0009] The main lip sealing assembly includes two main lip sealing bodies that are symmetrically arranged on the horizontal section of the T-shaped metal skeleton.

[0010] The secondary lip sealing assembly includes two sets of L-shaped ring frames and two secondary lip sealing bodies. The two sets of L-shaped ring frames are respectively arranged on both sides of the junction of the vertical and horizontal sections of the T-shaped metal frame; the two secondary lip sealing bodies are respectively arranged on the horizontal arms of the corresponding two sets of L-shaped ring frames.

[0011] Furthermore, each of the main lip seals includes a root portion that fits against the horizontal segment and a sealing lip portion extending from the root portion toward the center of the annular structure. The sealing lip portion has a V-shaped cross-section and a contact surface facing the sealed surface.

[0012] Furthermore, the secondary lip seal has an annular structure, including a base that fits against the horizontal arm of the L-shaped ring frame and a secondary lip that extends from the base toward the center of the annular structure. The cross-section of the secondary lip has an inwardly folded arc or a multi-folded arc structure in the annular direction.

[0013] Furthermore, the base of each of the secondary lip seals gradually thins towards the secondary lip, forming a lip edge at the end of the secondary lip.

[0014] Furthermore, the outer side of the vertical section of the T-shaped metal frame is provided with two sealing ring mounting grooves, and a sealing ring is provided in the sealing ring mounting groove.

[0015] Furthermore, the cross-sectional shape of the sealing ring mounting groove is rectangular or trapezoidal.

[0016] Furthermore, the T-shaped metal skeleton, the main lip sealing assembly, and the secondary lip sealing assembly together form a circumferential annular lubricating oil cavity.

[0017] Furthermore, each of the main lip sealing bodies has an annular spring groove at the transition section between the root and the sealing lip, and an annular spring is installed in the spring groove.

[0018] Furthermore, the outer edge of the vertical section of the T-shaped metal frame is provided with a chamfered transition structure or a rounded corner transition structure.

[0019] Furthermore, the vertical part of the L-shaped ring frame and the corner of the horizontal arm are rounded.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This utility model's large-scale combined oil-gas seal, through a combination structure of a T-shaped metal frame and an L-shaped ring frame, achieves improved overall rigidity and stability of the sealing component, making it suitable for complex working conditions such as large mining trucks with high loads, high temperatures, and high-speed rotation. The structural design introduces four sealing lips: the main lip sealing group is used for lubricating oil sealing, and the secondary lip sealing group is used to block external dust and moisture, resulting in clear layering and reliable sealing performance. The secondary lip sealing body adopts an inwardly folded arc or multi-folded arc self-tightening structure, which can automatically deform and fit under pressure, eliminating the need for traditional spring structures and improving reliability and durability. The main lip sealing body has a V-shaped sealing lip with a spring groove at the root that cooperates with a ring spring, further enhancing sealing performance. The seal's interior encloses a lubricating oil cavity, which, combined with the sealing ring mounting groove and grease coating structure on the outside of the frame, effectively reduces frictional heat accumulation and extends service life. Furthermore, this utility model incorporates multiple rounded or chamfered transitions in structural details, simplifying the manufacturing process, facilitating assembly and maintenance, resulting in a compact overall structure, good machinability, and convenient assembly and disassembly, demonstrating significant practical value. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the large combined oil-gas seal according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the L-shaped ring frame and the secondary lip seal.

[0025] Figure 3 This is a schematic diagram of the structure of the T-shaped metal frame and the main lip sealing assembly.

[0026] The diagram is labeled as follows:

[0027] 1-T-type metal frame, 101-vertical section, 102-horizontal section, 2-main lip seal, 201-spring groove, 3-L-type ring frame, 4-secondary lip seal, 401-secondary lip, 5-seal ring mounting groove, 6-seal ring, 7-lubricating oil cavity. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Example:

[0032] like Figures 1 to 3 As shown, this embodiment provides a large combined oil-gas seal for wheel hubs, including a T-shaped metal skeleton 1, a main lip sealing assembly, and a secondary lip sealing assembly.

[0033] The T-shaped metal frame 1 is a ring structure with a "T"-shaped cross-section, specifically including a vertical section 101 and a horizontal section 102 extending from the middle of the vertical section 101 to the center of the ring structure. The metal frame 1 is made of carbon steel or stainless steel, and after surface phosphating, sandblasting and other treatments, it is integrally formed with the rubber seal through a hot vulcanization process to form a stable and solid structural foundation.

[0034] The main lip seal assembly includes two main lip seal bodies 2 symmetrically arranged on the upper and lower surfaces of the horizontal section 102 of the T-shaped metal frame 1. Each main lip seal body 2 includes a root that fits against the metal frame and a sealing lip extending from the root towards the center of the annular structure. The sealing lip has a V-shaped cross-section, with a contact surface at its end facing the rotating shaft being sealed. An annular spring groove 201 is provided at the transition section between the root of the main lip seal body 2 and the sealing lip, with an annular spring embedded in the groove to enhance the contact force between the lip and the shaft surface and improve sealing stability. The main lip seal body 2 is made of high-temperature resistant and wear-resistant nitrile rubber (NBR) or hydrogenated nitrile rubber (HNBR) to adapt to a wide temperature range of -45℃ to 150℃.

[0035] The secondary lip seal assembly includes two sets of L-shaped ring frames 3 and two secondary lip seal bodies 4. Each set of L-shaped ring frames 3 is located on the corresponding side of the intersection of the vertical section 101 and the horizontal section 102 of the T-shaped metal frame 1, and includes a horizontal arm and a vertical arm, forming an overall "L" shape. The two secondary lip seal bodies 4 are fixedly mounted on the horizontal arms of the two sets of L-shaped ring frames 3. The secondary lip seal body 4 has an annular structure, including a base that fits against the horizontal arm of the L-shaped ring frame 3, and a secondary lip extending from the base towards the center of the annular structure. The secondary lip has an inwardly folded arc or multi-folded arc structure in the circumferential cross-section, and its material is preferably made of oil-resistant and heat-resistant materials such as nitrile rubber, fluororubber (FKM), or acrylic rubber. The secondary lip seal body 4 has a self-tightening structure, and can still fit against the shaft under pressure even without a spring.

[0036] The main lip seal 2 and the secondary lip seal 4 together enclose a continuous circumferential lubricating oil cavity 7 in both the axial and radial directions. After the sealing assembly is assembled, the lubricating oil cavity 7 is filled with grease to reduce friction between the lip and the rotating shaft, reduce temperature rise, and extend the service life of the sealing assembly.

[0037] Two sealing ring mounting grooves 5 are provided on the outer side of the vertical section 101 of the T-shaped metal frame 1. Standard O-rings 6 are installed in the grooves to achieve static sealing between the component and the hub cavity and prevent lubricating oil leakage. The cross-sectional shape of the sealing ring mounting grooves 5 is rectangular or trapezoidal to accommodate various sizes of sealing rings.

[0038] In addition, to reduce processing difficulty and avoid stress concentration, rounded or chamfered transition structures are provided on the outer edge of the vertical section 101 of the T-shaped metal frame 1 and at the corners of the L-shaped ring frame 3, so that the overall structure is smoothly connected and naturally formed, improving the mechanical properties and long-term stability of the components.

[0039] This combined oil-gas seal has a compact structure, good symmetry, and is easy to process. It is particularly suitable for sealing applications in the hub area of ​​large mining vehicles. It can effectively isolate external impurities and prevent internal lubricating oil leakage, and adapt to sealing requirements under various high temperature, high pressure, heavy load, and complex road conditions.

[0040] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A large combined oil-gas seal for wheel hubs, characterized in that, include: A ring-shaped T-shaped metal skeleton, wherein the cross-section of the T-shaped metal skeleton is T-shaped, including a vertical segment and a horizontal segment extending from the middle of the vertical segment to the center of the ring; The main lip sealing assembly includes two main lip sealing bodies that are symmetrically arranged on the horizontal section of the T-shaped metal skeleton. The secondary lip sealing assembly includes two sets of L-shaped ring frames and two secondary lip sealing bodies. The two sets of L-shaped ring frames are respectively arranged on both sides of the junction of the vertical and horizontal sections of the T-shaped metal frame; the two secondary lip sealing bodies are respectively arranged on the horizontal arms of the corresponding two sets of L-shaped ring frames.

2. The large combined oil-gas seal for wheel hubs according to claim 1, characterized in that, Each of the main lip seals includes a root portion that fits against the horizontal segment and a sealing lip portion that extends from the root portion toward the center of the annular structure. The sealing lip portion has a V-shaped cross-section and a contact surface facing the sealed surface.

3. The large combined oil-gas seal for wheel hubs according to claim 1, characterized in that, The secondary lip seal has an annular structure, including a base that fits against the horizontal arm of the L-shaped ring frame and a secondary lip that extends from the base toward the center of the annular structure. The cross-section of the secondary lip has an inwardly folded arc or a multi-folded arc structure in the annular direction.

4. The large combined oil-gas seal for wheel hubs according to claim 3, characterized in that, The base of each of the secondary lip seals gradually thins towards the secondary lip, forming a lip edge at the end of the secondary lip.

5. The large combined oil-gas seal for wheel hubs according to claim 1, characterized in that, The outer side of the vertical section of the T-shaped metal frame is provided with two sealing ring mounting grooves, and a sealing ring is installed in the sealing ring mounting groove.

6. The large combined oil-gas seal for wheel hubs according to claim 5, characterized in that, The cross-sectional shape of the sealing ring mounting groove is rectangular or trapezoidal.

7. The large combined oil-gas seal for wheel hubs according to claim 1, characterized in that, The T-shaped metal frame, together with the main lip sealing assembly and the secondary lip sealing assembly, forms a circumferential annular lubricating oil cavity.

8. The large combined oil-gas seal for wheel hubs according to claim 1, characterized in that, Each of the main lip sealing bodies has an annular spring groove at the transition section between the root and the sealing lip, and an annular spring is installed in the spring groove.

9. The large combined oil-gas seal for wheel hubs according to claim 1, characterized in that, The outer edge of the vertical section of the T-shaped metal frame is provided with a chamfered transition structure or a rounded corner transition structure.

10. The large combined oil-gas seal for wheel hubs according to claim 1, characterized in that, The vertical part of the L-shaped ring frame and the corner of the horizontal arm are rounded.

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