High-reliability combined sealing structure

Abstract

The invention discloses a high-reliability combined type sealing structure which comprises a fixing seat, a sealing part and a sealing part. The rotating part is a gear part, a labyrinth structure is arranged on one side, opposite to the fixed seat, of the rotating part, and mounting positions of a dustproof sealing part and a wear-resistant part are arranged on the rotating part; the V-shaped ring is arranged at the dustproof sealing element mounting position of the rotating element, is in contact with the fixed seat and can rotate relative to the fixed seat; the felt is arranged on the sealing piece mounting part of the fixed seat and is positioned between the V-shaped ring and the main sealing structure; the dynamic seal is of a framework sealing structure, is arranged on the sealing piece mounting part of the fixed seat and serves as a main sealing structure of the combined sealing structure; the wear-resistant ring is arranged at the wear-resistant part mounting position of the rotating part and is matched with the dynamic seal to form a dynamic seal pair; and the pressing plate covers the outer side of the V-shaped ring and is connected with the fixed seat, a dustproof space is defined by the pressing plate and the rotating part, and a gap is reserved between the pressing plate and the V-shaped ring.

Description

Technical Field

[0001] This disclosure generally relates to the field of sealing structure technology. More specifically, this disclosure relates to a highly reliable combined sealing structure. Background Technology

[0002] Heavy-duty vehicles used in open-pit mining operations commonly employ wheel-side reducers for both driving and deceleration. These reducers are integrated gear transmission systems with a housing structure. The housing must be filled with lubricating oil to lubricate and protect key transmission components such as gears and bearings, ensuring their performance and lifespan. Therefore, there are areas within the gearbox requiring dynamic sealing, and the sealing effect directly determines the overall reliability of the wheel-side reducer. Currently, the industry standard for dynamic sealing between the gearbox mounting base and rotating gears is a simple combination of a felt dustproof structure and a skeleton oil seal. The felt blocks external dust and other foreign matter, while the skeleton oil seal provides the main seal of the gearbox, thus meeting basic dynamic sealing requirements. However, this existing sealing solution has significant drawbacks in actual operation. The felt is prone to premature failure. Once the felt fails, external dust and other foreign matter can directly enter the lip of the skeleton oil seal, causing the oil seal to fail and resulting in the failure of the main seal in the gearbox's dynamic sealing area.

[0003] In view of this, there is an urgent need to provide a highly reliable combined sealing structure in order to reduce the probability of main seal failure caused by premature felt failure. Summary of the Invention

[0004] In order to address at least one or more of the technical problems mentioned above, this disclosure proposes a highly reliable combined sealing structure.

[0005] This disclosure provides a highly reliable combined sealing structure for dynamic sealing between a gearbox mounting base and a rotating gear component. It includes: a mounting base having a sealing element mounting portion; a rotating component, which is a gear component, having a labyrinth structure on its side opposite to the mounting base, and mounting positions for a dustproof seal and a wear-resistant component on the rotating component; a V-ring located at the dustproof seal mounting position of the rotating component, contacting the mounting base and capable of relative rotation, used to isolate external foreign objects; and a dynamic seal, which is a skeleton sealing structure located on the mounting base. The sealing mounting part of the fixed seat serves as the main sealing structure of the combined sealing structure; the felt is disposed in the sealing mounting part of the fixed seat, located between the V-ring and the main sealing structure, and is used to isolate external foreign objects to protect the main sealing structure; the wear-resistant ring is disposed in the wear-resistant mounting position of the rotating part, and cooperates with the dynamic seal to form a dynamic sealing pair; and the pressure plate covers the outside of the V-ring and is connected to the fixed seat, the pressure plate and the rotating part enclose a dustproof space, and a gap is reserved between the pressure plate and the V-ring.

[0006] In some embodiments, the mounting base is connected to the gearbox housing via fasteners, and the mating surfaces of the mounting base and the gearbox housing are provided with a planar sealing structure.

[0007] In some embodiments, the planar sealing structure is a sealant applied to the mating surfaces of the mounting base and the gearbox base, and the fastener is a bolt.

[0008] In some embodiments, the rotating component has a stepped structure, and the V-ring is tightly clamped to the stepped structure. The rotating component axially presses the V-ring through the stepped structure, so that the lip of the V-ring is in contact with the fixed seat, and there is no relative movement between the V-ring and the rotating component.

[0009] In some embodiments, the sealing mounting portion of the fixing seat is a concave groove, the felt is embedded in the concave groove, and a fixing structure is provided between the felt and the concave groove to keep the felt stationary.

[0010] In some embodiments, the fixing structure between the felt and the concave groove is an adhesive applied to the joint between the two.

[0011] In some embodiments, the fixed seat and the rotating component cooperate to form a labyrinth cavity, which is filled with a lubricating medium to prevent the V-ring and felt from dry friction; the fixed seat is provided with a medium filling hole, which is equipped with a sealing element to realize the replenishment of the lubricating medium.

[0012] In some embodiments, the lubricating medium is grease, the medium filling hole is a tapered thread through hole, and the sealing element fitted on the tapered thread through hole is a sealing plug.

[0013] In some embodiments, the working position of the rotating component opposite to the felt is provided with a chamfer structure to prevent the felt from turning over when the rotating component is in operation.

[0014] In some embodiments, the dynamic seal is interference-fitted to the sealing mounting portion of the fixed seat, the wear ring is interference-fitted to the wear mounting position of the rotating component, and the lip of the dynamic seal rotates relative to the plane of the wear ring to form an oil film.

[0015] In some embodiments, the pressure plate is detachably connected to the fixed seat by bolts and washers, and the dustproof space formed by the pressure plate and the rotating component is provided on the outside of the V-ring to reduce the contact between external foreign objects and the V-ring.

[0016] In some embodiments, the rotating component is a toothed transmission output structure, and the rotating component provides an installation position for the lip seat of the dynamic seal and the V-ring. The rotating component and the fixed seat cooperate to form a compact labyrinth seal structure.

[0017] With the highly reliable combined sealing structure provided above, the embodiments disclosed herein use a labyrinth structure combined with multiple layers of sealing elements for layered protection. The pressure plate encloses the dustproof space, and the various components are adapted and installed to form a progressive sealing system, which can reduce the probability of main seal failure caused by premature felt failure. Attached Figure Description

[0018] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0019] Figure 1 An exemplary partial cross-sectional view of a high-reliability combined sealing structure according to some embodiments of this disclosure is shown; Figure 2 An exemplary partial cross-sectional view of a high-reliability combined sealing structure according to some embodiments of this disclosure is shown. Detailed Implementation

[0020] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0021] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0023] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0024] This disclosure provides a highly reliable combined sealing structure, which uses a labyrinth structure with multiple layers of sealing elements for layered protection. The pressure plate encloses the dustproof space, and the various components are adapted and installed to form a progressive sealing system. This can reduce the probability of main seal failure caused by premature felt failure, effectively block external foreign objects, and improve the overall reliability of the gearbox dynamic seal and the service life of the components.

[0025] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings.

[0026] See Figure 1 and Figure 2 , Figure 1 An exemplary partial cross-sectional view of a high-reliability combined sealing structure according to some embodiments of this disclosure is shown. Figure 2 An exemplary partial cross-sectional view of a high-reliability combined sealing structure according to some embodiments of this disclosure is shown.

[0027] Some embodiments disclosed herein provide a highly reliable combined sealing structure for a dynamic seal 5 between a gearbox mounting base 1 and a rotating gear component. The structure includes a mounting base 1, a rotating component 2, a V-ring 3, a felt 4, a dynamic seal 5, a wear-resistant ring 6, and a pressure plate 10. The mounting base 1 and the rotating component 2 cooperate to form a labyrinthine cavity, and the mounting base 1 has a seal mounting portion. The rotating component 2 is a gear component, and a labyrinth structure is provided on the side of the rotating component 2 opposite to the mounting base 1. The rotating component 2 has mounting positions for a dustproof seal and a wear-resistant component. The V-ring 3 is located at the dustproof seal mounting position of the rotating component 2, contacts the mounting base 1, and rotates relative to it to isolate external foreign objects. The felt 4 is located at the seal mounting portion of the mounting base 1, between the V-ring 3 and the main sealing structure, to isolate external foreign objects and protect the main sealing structure. The dynamic seal 5 is a skeleton sealing structure located at the seal mounting portion of the mounting base 1, serving as the main sealing structure of the combined sealing structure. The wear-resistant ring 6 is located at the wear-resistant mounting position of the rotating part 2 and cooperates with the dynamic seal 5 to form a dynamic sealing pair. The pressure plate 10 covers the outside of the V-ring 3 and is connected to the fixed seat 1. The pressure plate 10 and the rotating part 2 enclose a dustproof space, and a gap is reserved between the pressure plate 10 and the V-ring 3.

[0028] This combined sealing structure can be used in wheel-side reducer gearboxes of heavy-duty vehicles transporting goods in open-pit mines. The main sealing component consists of a V-ring 3, felt 4, a skeleton seal, and a labyrinth design of a rotating component 2. The labyrinth cavity is defined by the labyrinth structure of the fixed seat 1 and the rotating component 2. The sealing component mounting section is used for the installation and positioning of each seal. Dustproof seals, the main sealing structure, and wear-resistant components are arranged in layers to form multiple layers of sealing protection. The dustproof space enclosed by the pressure plate 10 blocks external foreign objects, and the reserved gap between it and the V-ring 3 avoids wear caused by relative friction. Therefore, this combined sealing structure provides multi-layered sealing protection from dustproof to the main seal, effectively reducing the probability of main seal failure caused by premature failure of the felt 4 and improving the overall reliability of the gearbox dynamic seal 5.

[0029] In this embodiment, the fixing seat 1 is connected to the gearbox base 7 by fasteners, and the mating surfaces of the fixing seat 1 and the gearbox base 7 are provided with a planar sealing structure. The fasteners provide a detachable fixed connection between the fixing seat 1 and the gearbox base 7, thereby improving the structural strength of the connection and ensuring ease of maintenance in the future. The planar sealing structure, located at the mating surfaces, can effectively seal the gap between the mating surfaces, preventing lubricating oil inside the gearbox from leaking through the gap and blocking external foreign objects from entering the gearbox, thus improving the sealing integrity at the connection between the gearbox and the sealing structure.

[0030] Further, or optionally, the planar sealing structure consists of sealant applied to the mating surfaces of the fixed base 1 and the gearbox base 7, with bolts as the fasteners. Applying sealant to the mating surfaces of the fixed base 1 and the gearbox base 7 allows for the filling of the mating gap between them with flexible sealant, resulting in stronger and more stable sealing. Using bolts as fasteners provides higher connection strength, ensuring the structural stability between the fixed base 1 and the gearbox base 7, preventing loosening due to vibrations during equipment operation, ensuring the durability of the planar seal, and also facilitating subsequent maintenance and disassembly.

[0031] In some embodiments, the rotating component 2 has a stepped structure, and the V-ring 3 is tightly clamped to the stepped structure. The rotating component 2 axially presses the V-ring 3 through the stepped structure, ensuring that the lip of the V-ring 3 remains in contact with the fixed seat 1, and there is no relative movement between the V-ring 3 and the rotating component 2. The stepped structure of the rotating component 2 provides axial positioning and clamping support for the V-ring 3. The V-ring 3 is circumferentially fixed by being clamped to the stepped structure. The axial clamping effect of the stepped structure on the V-ring 3 ensures a stable fit between the lip of the V-ring 3 and the fixed seat 1, improving the sealing effect of the V-ring 3 in isolating external foreign objects. The design of no relative movement between the V-ring 3 and the rotating component 2 eliminates friction and wear between them, effectively extending the service life of the V-ring 3.

[0032] In some embodiments, the sealing mounting portion of the fixing seat 1 is a concave groove, in which the felt 4 is embedded, and a fixing structure is provided between the felt 4 and the concave groove to keep the felt 4 stationary. The size and shape of the concave groove can be designed according to the shape of the felt 4 to at least partially accommodate the felt 4, thereby achieving dual radial and circumferential restraint on the felt 4. On the one hand, it can prevent the felt 4 from shifting during equipment operation; on the other hand, it can also increase the contact area between the felt 4 and the sealing mounting portion, improving the sealing and protection effect. The fixing structure between the felt 4 and the concave groove further enhances the installation stability of the felt 4. The stationary installation state allows the felt 4 to continuously and stably isolate external foreign objects, forming reliable protection for the subsequent main sealing structure and preventing foreign objects from entering and affecting the main sealing effect.

[0033] In some embodiments, the fixing structure between the felt 4 and the concave groove is an adhesive applied to the contact area between the two. Applying adhesive to the contact area between the felt 4 and the concave groove not only achieves a firm bond between the two but also enhances the sealing performance. This fixing method is simple to operate and has a good fixing effect, effectively limiting the displacement of the felt 4 and ensuring that the felt 4 is always in the preset installation position, continuously providing protection against external foreign objects. At the same time, the application of adhesive does not affect the dustproof performance of the felt 4 and can adapt to the working environment of the wheel-side reducer, ensuring the stability of the fixing effect.

[0034] In some embodiments, the labyrinth cavity formed by the fixed seat 1 and the rotating component 2 is filled with a lubricating medium to prevent dry friction between the V-ring 3 and the felt 4. The fixed seat 1 is provided with a medium filling hole, which is equipped with a seal to allow for the replenishment of the lubricating medium. The lubricating medium filling the labyrinth cavity can form an oil film between the contact parts of the V-ring 3 and the felt 4, preventing dry friction during long-term high-speed operation and reducing wear and tear on the components. The medium filling hole on the fixed seat 1 provides a dedicated channel for the later maintenance and replenishment of the lubricating medium, and the seal installed on it can effectively seal the channel after filling, preventing leakage of the lubricating medium in the labyrinth cavity and blocking external foreign objects from entering through the filling hole. By replenishing the lubricating medium later, the lubrication conditions of the V-ring 3 and the felt 4 can be kept stable, thereby further improving their service life.

[0035] In some embodiments, the lubricating medium is grease, the medium filling hole is a tapered thread through hole, and the sealing element fitted on the tapered thread through hole is a sealing plug. The grease can be a commonly used long-life industrial grease, which, as the lubricating medium, has strong adhesion and long-lasting lubrication effect, providing long-term lubrication for the V-ring 3 and felt 4 within the labyrinth cavity, effectively preventing dry friction. By setting the medium filling hole as a tapered thread through hole, the characteristics of the tapered thread allow for a tighter thread fit and better sealing performance. Combined with the sealing plug, reliable sealing of the through hole is achieved after grease filling, effectively preventing grease leakage from the through hole and preventing external dust, moisture, and other foreign matter from entering the labyrinth cavity through the through hole, ensuring a lubrication and sealing environment inside the labyrinth.

[0036] Furthermore, a chamfered structure is provided at the point of contact between the rotating component 2 and the felt 4 to prevent the felt 4 from flipping over during the operation of the rotating component 2. This chamfered structure can employ a large chamfer design to eliminate sharp corners at the point of contact between the rotating component 2 and the felt 4, and to reduce the contact area between the edge of the felt 4 and adjacent components. Therefore, during the high-speed operation of the rotating component 2, the probability of flipping over due to sharp corners rubbing against or snagging the felt 4 is effectively reduced. Reducing the probability of the felt 4 flipping over improves the stability of the fit clearance between it and the rotating component 2, ensuring the continued effectiveness of the dustproof and insulating effect of the felt 4, while also preventing damage to the felt 4 caused by flipping over, thus extending the service life of the felt 4.

[0037] Further or optionally, the dynamic seal 5 is interference-fitted to the sealing mounting part of the fixed seat 1, and the wear ring 6 is interference-fitted to the wear-resistant mounting position of the rotating part 2. The lip of the dynamic seal 5 and the plane of the wear ring 6 rotate relative to each other and form an oil film. The interference fit between the dynamic seal 5 and the fixed seat 1, and between the wear ring 6 and the rotating part 2, can achieve a firm fixation between the two through the structure of the components themselves, reducing the probability of loosening or displacement during equipment operation. The oil film formed by the relative rotation of the lip of the dynamic seal 5 and the plane of the wear ring 6 can effectively seal the lubricating oil inside the gearbox to prevent leakage, and can also form lubrication on the relatively moving contact surface, reducing friction and wear between the lip of the dynamic seal 5 and the wear ring 6, and ensuring the sealing performance and service life of the main sealing structure.

[0038] Further or optionally, the pressure plate 10 is detachably connected to the fixed base 1 via bolts and washers. The dustproof space formed by the pressure plate 10 and the rotating component 2 is located outside the V-ring 3, reducing contact between external foreign objects and the V-ring 3. The connection method of bolts and washers allows for convenient assembly and disassembly of the pressure plate 10 and the fixed base 1, facilitating subsequent inspection and replacement of internal sealing components such as the V-ring 3. The dustproof space formed by the pressure plate 10 and the rotating component 2, located outside the V-ring 3, provides a physical barrier against external dust, sand, and other foreign objects, significantly reducing direct contact between foreign objects and the V-ring 3, optimizing the working environment of the V-ring 3, reducing wear and contamination caused by foreign objects, and improving the dustproof sealing performance of the V-ring 3.

[0039] In some embodiments, the rotating component 2 is a toothed transmission output structure. The rotating component 2 provides an installation position for the lip seat of the dynamic seal 5 and the V-ring 3. The rotating component 2 and the fixed seat 1 cooperate to form a compact labyrinth seal structure. The toothed transmission output structure of the rotating component 2 allows it to be used simultaneously for gearbox transmission and seal installation. The compact labyrinth seal structure formed by the labyrinth structure of the rotating component 2 and the fixed seat 1 reduces the local mating space. Multiple folds achieve layered isolation of external foreign objects, improving the dustproof effect of the overall sealing structure. Simultaneously, the compact design saves installation space and adapts to the overall structural layout of the wheel-side reducer gearbox.

[0040] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A highly reliable combined sealing structure for dynamic sealing between a gearbox housing (7) and a rotating gear component, characterized in that, include: The fixed base (1) has a sealing element mounting part; Rotating component (2), which is a gear component, has a labyrinth structure on the side of the rotating component (2) opposite to the fixed base (1), and the rotating component (2) has mounting positions for dustproof seals and wear-resistant components; V-ring (3), which is located at the dustproof seal mounting position of the rotating part (2), contacts the fixed seat (1) and can rotate relative to it, and is used to isolate external foreign objects; Dynamic seal (5), which is a skeleton sealing structure and is located in the sealing element mounting part of the fixed seat (1), serves as the main sealing structure of the combined sealing structure; Felt (4), which is located in the sealing mounting part of the fixed seat (1), between the V-ring (3) and the main sealing structure, is used to isolate external foreign objects to protect the main sealing structure; A wear-resistant ring (6), which is located at the wear-resistant mounting position of the rotating part (2), cooperates with the dynamic seal (5) to form a dynamic seal (5) pair; and The pressure plate (10) covers the outside of the V-ring (3) and is connected to the fixed seat (1). The pressure plate (10) and the rotating part (2) enclose a dustproof space, and a gap is reserved between the pressure plate (10) and the V-ring (3).

2. The high-reliability combined sealing structure according to claim 1, characterized in that, The fixed seat (1) is connected to the gearbox base (7) by fasteners, and the mating surface of the fixed seat (1) and the gearbox base (7) is provided with a planar sealing structure.

3. The high-reliability combined sealing structure according to claim 2, characterized in that, The planar sealing structure is a sealant applied to the mating surfaces of the fixed seat (1) and the gearbox base (7), and the fastener is a bolt.

4. The high-reliability combined sealing structure according to claim 1, characterized in that, The rotating part (2) is provided with a stepped structure, and the V-ring (3) is tightly clamped to the stepped structure. The rotating part (2) axially presses the V-ring (3) through the stepped structure, so that the lip of the V-ring (3) is in contact with the fixed seat (1), and there is no relative movement between the V-ring (3) and the rotating part (2).

5. The high-reliability combined sealing structure according to claim 1, characterized in that, The sealing part of the fixed seat (1) is a concave groove, the felt (4) is embedded in the concave groove, and a fixing structure is provided between the felt (4) and the concave groove to keep the felt (4) stationary.

6. The high-reliability combined sealing structure according to claim 5, characterized in that, The fixing structure between the felt (4) and the concave groove is an adhesive applied to the joint between the two.

7. The high-reliability combined sealing structure according to claim 1, characterized in that, The fixed seat (1) and the rotating part (2) cooperate to form a labyrinth cavity, which is filled with a lubricating medium to prevent the V-ring (3) and the felt (4) from dry friction; the fixed seat (1) is provided with a medium filling hole, and a sealing element is installed on the medium filling hole to realize the replenishment of the lubricating medium.

8. The high-reliability combined sealing structure according to claim 7, characterized in that, The lubricating medium is grease, the medium filling hole is a tapered thread through hole, and the sealing element fitted on the tapered thread through hole is a sealing plug.

9. The high-reliability combined sealing structure according to any one of claims 1 to 8, characterized in that, The rotating part (2) is provided with a chamfered structure at the position opposite to the felt (4) to prevent the felt (4) from turning over when the rotating part (2) is running.

10. The high-reliability combined sealing structure according to any one of claims 1 to 8, characterized in that, The dynamic seal (5) is interference-fitted to the sealing part of the fixed seat (1), and the wear-resistant ring (6) is interference-fitted to the wear-resistant part of the rotating part (2). The lip of the dynamic seal (5) rotates relative to the plane of the wear-resistant ring (6) and forms an oil film.

11. The high-reliability combined sealing structure according to any one of claims 1 to 8, characterized in that, The pressure plate (10) is detachably connected to the fixed seat (1) by bolts and washers. The dustproof space formed by the pressure plate (10) and the rotating part (2) is placed outside the V-ring (3) to reduce the contact between external foreign objects and the V-ring (3).

12. The high-reliability combined sealing structure according to any one of claims 1 to 8, characterized in that, The rotating component (2) is a toothed transmission output structure. The rotating component (2) provides an installation position for the lip seat of the dynamic seal (5) and the V-ring (3). The rotating component (2) and the fixed seat (1) cooperate to form a compact labyrinth seal structure.

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