A sealed housing structure for an L-shaped gear box

Abstract

The utility model relates to gear box sealing structure related technical field, especially a kind of sealing shell structure of L type gear box, including first border, the side of first border is inlaidly connected with second border, the side of second border is pasted with side cover, in use process, assembly stage installs seal first, static seal aspect embeds first sealing ring into first border side surface sealing groove, vertical shaft side in small hole embeds the first skeleton oil seal with lip towards box, outer large aperture embeds first nitrile rubber sealing ring, the first nitrile rubber sealing ring of outer large aperture prevents gland edge leakage, directly from sealing groove takes out and replaces sealing ring, realignment is reloaded by dowel pin;In dynamic sealing replacement, vertical shaft side unscrews second bolt and takes down gland, horizontal shaft side can replace internal sealing element after sealing seat is dismantled, whole process does not need to disassemble gear shaft system, and sealing performance can be recovered by dowel pin and first bolt, second bolt reloaded, greatly improve the sealing performance of gear box.

Description

Technical Field

[0001] This utility model relates to the technical field of gearbox sealing structures, and in particular to a sealing shell structure for an L-shaped gearbox. Background Technology

[0002] As a core component of mechanical transmission systems, the gearbox's sealed housing structure is crucial for ensuring power transmission efficiency and equipment lifespan, and it is widely used in industrial machinery, agricultural equipment, and automation equipment. The sealed housing must simultaneously fulfill two core functions: first, to form a closed space to house gears, lubricating oil, and other transmission components, preventing lubricating oil leakage due to high-speed gear rotation or gearbox tilting; second, to prevent the intrusion of external dust, moisture, and impurities, avoiding wear on gear meshing surfaces or contamination and deterioration of the lubricating oil. In traditional designs, the sealed housing is typically assembled from basic components such as frames and end caps; therefore, an L-shaped gearbox sealed housing structure is particularly needed.

[0003] However, existing gearbox sealing housing structures typically use a single seal to cover multiple component mating surfaces during use, resulting in low sealing integration and a lack of independent sealing design. This makes them prone to seal failure due to gaps in component splicing or vibration. Furthermore, disassembly and assembly require complete disassembly, making it impossible to replace individual seals. Maintenance also necessitates the removal of core components such as the gear shaft system, which is time-consuming and labor-intensive, thus affecting the gearbox's sealing performance.

[0004] To address the aforementioned issues, a search revealed a patent with publication number CN222458312U that discloses a high-sealing structure for a gearbox. The patent states that "the operator inserts the first and second housings onto the gearbox body. A fixing ring provides a seal at the gearbox body's shaft. The rotating ring and the first telescopic spring work together to prevent wear on the sealing structure during prolonged operation. The damping rod, the second telescopic spring, and the pressure block on the support block buffer and secure the first and second housings, reducing vibration during shaft rotation. Tightening the bolts fixes the first and second housings, thus solving the technical problem of wear affecting the service life of the sealing structure during gearbox operation." Although... While the gearbox body achieves basic sealing through the cooperation of the first and second housings, and the sealing effect at the housing connection is enhanced by the sealing gasket, and the wear of the shaft on the sealing structure is reduced by the rotating ring and the first telescopic spring, and the impact of shaft vibration on the seal is buffered by the damping rod and the second telescopic spring, and the housing is fixed by the fixing component; however, its sealing structure does not adopt a layered design of multiple independent sealing rings, and cannot form multiple independent static seals, making it difficult to cover the sealing requirements of complex parts such as shaft holes and notches; its shaft only achieves basic sealing through the fixing ring, lacking the function of targeted blocking of oil leakage and active interception of external dust; at the same time, its seals are fixedly connected to the housing and do not adopt a modular design, requiring the entire housing to be disassembled for maintenance, which is insufficient in terms of sealing reliability under complex working conditions, maintenance convenience and dust and leakage prevention coordination.

[0005] In light of this, in-depth research into the aforementioned issues led to the creation of this case. Summary of the Invention

[0006] The purpose of this utility model is to provide a sealing housing structure for an L-shaped gearbox, in order to solve the problems mentioned in the background art regarding the existing gearbox sealing housing structure. In use, the traditional gearbox sealing housing structure usually uses a single seal to cover the contact surfaces of multiple components, resulting in low sealing integration and a lack of independent sealing design. It is prone to sealing failure due to gaps in component splicing or vibration. Disassembly and assembly require overall disassembly, and it is impossible to replace the seal individually. During maintenance, core components such as the gear shaft system need to be disassembled, which is time-consuming and labor-intensive, affecting the sealing performance of the gearbox.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a sealed housing structure for an L-shaped gearbox, comprising a first frame, a second frame fitted to one side of the first frame, a side cover attached to one side of the second frame, a first bolt slidably connected to one side of the side cover, an outer large hole at one end of the upper surface of the second frame, an inner small hole at the other end of the upper surface of the second frame, a first nitrile rubber sealing ring fitted to the surface of the outer large hole, a first skeleton oil seal fitted to the surface of the inner small hole, a pressure cap attached to the surface of the outer large hole, a second bolt movably sleeved at one end of the pressure cap, a sealing seat attached to one side of the first frame, a second nitrile rubber sealing ring fitted to one side of the surface of the sealing seat, a second skeleton oil seal fitted to one side of the inner wall surface of the sealing seat, a polyurethane dustproof lip fitted to one end of the sealing seat, and a positioning pin fixedly connected to the other side of the first frame.

[0008] Preferably, a first sealing ring is fitted and connected to one side of the first frame, a second sealing ring is fitted and connected to one side of the side cover, and a third sealing ring is fitted and connected to one side of the second frame.

[0009] Preferably, both the first frame and the second frame are threadedly connected to the first bolt.

[0010] Preferably, the first nitrile rubber sealing ring is fitted to the gland.

[0011] Preferably, both the first frame and the second frame are threadedly connected to the second bolt.

[0012] Preferably, the positioning pin is fitted and connected to the second frame.

[0013] Preferably, the second sealing ring is fitted and connected to the first frame.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: The sealing shell structure of the L-shaped gearbox forms a triple independent static seal through the first sealing ring, the second sealing ring, and the third sealing ring, which can accurately block leakage for different mating surfaces and avoid the problem of overall leakage caused by the failure of a single seal in the traditional way; The threaded connection of the first bolt and the second bolt with the modular structure allows the seal to be disassembled and installed separately without disassembling the core shaft system, which greatly improves efficiency compared with the traditional method of overall equipment disassembly and maintenance, and greatly improves the sealing performance of the gearbox. Attached Figure Description

[0015] Figure 1 This is a side view of the appearance structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure in which the first frame and the side cover of this utility model cooperate with each other;

[0017] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0018] Figure 4 This is a schematic diagram of the structure in which the first and second borders of this utility model cooperate with each other;

[0019] Figure 5 This utility model Figure 4 Enlarged structural diagram at point B.

[0020] In the diagram: 1. First frame; 2. Second frame; 3. Side cover; 4. First bolt; 5. Outer large hole; 6. Inner small hole; 7. First nitrile rubber sealing ring; 8. First skeleton oil seal; 9. Pressure cap; 10. Second bolt; 11. Sealing seat; 12. Second nitrile rubber sealing ring; 13. Second skeleton oil seal; 14. Polyurethane dustproof lip; 15. First sealing ring; 16. Second sealing ring; 17. Third sealing ring; 18. Locating pin. Detailed Implementation

[0021] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-5This utility model provides a technical solution: a sealed housing structure for an L-shaped gearbox, including a first frame 1, a second frame 2 fitted to one side of the first frame 1, a side cover 3 attached to one side of the second frame 2, a first bolt 4 slidably connected to one side of the side cover 3, an outer large hole 5 at one end of the upper surface of the second frame 2, an inner small hole 6 at the other end of the upper surface of the second frame 2, a first nitrile rubber sealing ring 7 fitted to the surface of the outer large hole 5, a first skeleton oil seal 8 fitted to the surface of the inner small hole 6, a pressure cap 9 attached to the surface of the outer large hole 5, a second bolt 10 movably sleeved at one end of the pressure cap 9, a sealing seat 11 attached to one side of the first frame 1, a second nitrile rubber sealing ring 12 fitted to one side of the surface of the sealing seat 11, a second skeleton oil seal 13 fitted to one side of the inner wall surface of the sealing seat 11, a polyurethane dustproof lip 14 fitted to one end of the sealing seat 11, and a fixed connection on the other side of the first frame 1. With a positioning pin 18, during the assembly stage, the seals are installed first. For static sealing, the first sealing ring 15 is embedded in the side sealing groove of the first frame 1, the second sealing ring 16 is embedded in the edge sealing groove of the side cover 3, and the third sealing ring 17 is embedded in the top sealing groove of the second frame 2. The sealing grooves are all continuous closed rings covering the notch of the mating surface. Then, the positioning pin 18 of the first frame 1 is inserted into the corresponding pin hole of the second frame 2 to establish a reference, ensuring that the shaft hole, sealing groove and bolt hole are aligned. For dynamic sealing, the first skeleton oil seal 8 with the lip facing the inside of the box is embedded in the inner small hole 6 on the vertical shaft side, and the first nitrile rubber sealing ring 7 is embedded in the outer large hole 5. On the horizontal shaft side, the second nitrile rubber sealing ring 12, the second skeleton oil seal 13 and the polyurethane dustproof lip 14 are embedded in the sealing seat 11 in sequence. Finally, the first bolt 4 is used to diagonally tighten the side cover 3 and the first frame 1 and the second frame 2 alternately to compress the sealing rings. The second bolt 10 is used to tighten the pressure cover 9 to compact the outer large hole seal and the inner small hole oil seal. During operation, the static seal fills the gaps in the mating surface through the elastic deformation of the first sealing ring 15, the second sealing ring 16, and the third sealing ring 17, which can adaptively compensate for fluctuations in the oil pressure inside the box, forming a 360° closed barrier; in the dynamic seal, the first skeleton oil seal 8 on the vertical axis side intercepts lubricating oil with the clamping force of the lip, the first nitrile rubber sealing ring 7 on the outer large hole 5 prevents leakage at the edge of the gland 9, the second skeleton oil seal 13 on the horizontal axis side blocks oil leakage, and the polyurethane dustproof lip 14 filters dust; all the seals work together to block oil leakage and isolate external pollution. When replacing the static seal during maintenance, simply unscrew the first bolt 4 to separate the side cover 3, remove it directly from the sealing groove, replace the sealing ring, and reassemble it by aligning it with the positioning pin 18. When replacing the dynamic seal, unscrew the second bolt 10 on the vertical shaft side to remove the pressure cover 9, replace the first nitrile rubber sealing ring 7 and the first skeleton oil seal 8, and then reassemble the pressure cover 9. On the horizontal shaft side, remove the sealing seat 11 to replace the internal seal. The entire process does not require disassembling the gear shaft system. The sealing performance can be restored by reassembling it with the positioning pin 18 and the first bolt 4 and the second bolt 10.

[0023] Furthermore, a first sealing ring 15 is fitted and connected to one side of the first frame 1, a second sealing ring 16 is fitted and connected to one side of the side cover 3, and a third sealing ring 17 is fitted and connected to one side of the second frame 2. During use, a triple independent static seal can be formed at the contact surfaces of the first frame 1 and the second frame 2, the side cover 3 and the first frame 1, and the side cover 3 and the second frame 2. The elastic deformation of the sealing ring completely covers the contact gaps of each component. Even if the gearbox generates slight vibration or slight deformation of the components during operation, the sealing ring can adaptively compensate and completely block the oil leakage path.

[0024] Furthermore, both the first frame 1 and the second frame 2 are threadedly connected to the first bolt 4. Through the arrangement of the first frame 1, the second frame 2 and the first bolt 4, the preload can be applied evenly by alternating diagonal tightening, so that the contact surface pressure between the side cover 3 and the first frame 1 and the second frame 2 is consistent, avoiding component deformation or excessive compression of the sealing ring due to excessive local pressure. At the same time, the threaded connection facilitates quick disassembly and assembly, and the components can be separated without special tools during maintenance.

[0025] Furthermore, the first nitrile rubber sealing ring 7 is fitted with the gland 9. Through the setting of the first nitrile rubber sealing ring 7 and the gland 9, the oil resistance of the nitrile rubber can adapt to the lubricating oil environment in the gearbox. After the gland 9 is fitted, an auxiliary static seal can be formed at the outer large hole 5 of the gland 9 and the second frame 2, which not only prevents oil from leaking from the edge of the gland 9, but also stabilizes the installation position of the first skeleton oil seal 8 through the pressure of the gland 9, and avoids the oil seal from shifting due to vibration.

[0026] Furthermore, both the first frame 1 and the second frame 2 are threadedly connected to the second bolt 10. Through the arrangement of the first frame 1, the second frame 2 and the second bolt 10, the axial force of the bolt can firmly fix the cover 9 to the surface of the outer large hole 5, ensuring that the pressure of the cover on the first nitrile rubber sealing ring 7 and the first skeleton oil seal 8 is stable. Even if the gearbox runs for a long time, it can avoid the loosening of the seal due to vibration. At the same time, the threaded connection makes it easy to disassemble the cover 9 separately to replace the seal without disassembling the overall structure.

[0027] Furthermore, the positioning pin 18 is fitted and connected to the second frame 2. By setting the positioning pin 18 and the second frame 2, the relative positions of the first frame 1 and the second frame 2 can be forcibly constrained during assembly, ensuring that the sealing grooves, shaft holes and bolt holes of the two are completely aligned. This avoids the sealing ring being squeezed and deformed or gaps appearing at the joint of the sealing groove due to misalignment during installation, thereby reducing the risk of leakage from the source. At the same time, it simplifies the assembly process and eliminates the need for repeated alignment adjustments.

[0028] Furthermore, the second sealing ring 16 is fitted and connected to the first frame 1. Through the setting of the second sealing ring 16 and the first frame 1, the fitting structure can stably restrict the sealing ring in the sealing groove, preventing the sealing ring from shifting or falling off due to vibration during gearbox operation. At the same time, the tight fit between the sealing ring and the first frame 1 can cover all the fitting gaps between the side cover 3 and the first frame 1, including irregular parts of the shaft hole edge, ensuring the continuity and reliability of static sealing.

[0029] Working principle: During use, the sealing components are installed first during the assembly stage. For static sealing, the first sealing ring 15 is embedded in the side sealing groove of the first frame 1, the second sealing ring 16 is embedded in the edge sealing groove of the side cover 3, and the third sealing ring 17 is embedded in the top sealing groove of the second frame 2. All sealing grooves are continuous closed rings covering the notch of the mating surface. Then, the positioning pin 18 of the first frame 1 is inserted into the corresponding pin hole of the second frame 2 to establish a reference, ensuring that the shaft hole, sealing groove and bolt hole are aligned. For dynamic sealing, the first skeleton oil seal 8 with the lip facing the inside of the box is embedded in the inner small hole 6 on the vertical shaft side, and the first nitrile rubber sealing ring 7 is embedded in the outer large hole 5. On the horizontal shaft side, the second nitrile rubber sealing ring 12, the second skeleton oil seal 13 and the polyurethane dustproof lip 14 are embedded in the sealing seat 11 in sequence. Finally, the first bolt 4 is used to diagonally tighten the side cover 3 with the first frame 1 and the second frame 2 to compress the sealing ring. The second bolt 10 is used to tighten the pressure cover 9 to compact the outer large hole sealing component and the inner small hole oil seal. During operation, the static seal fills the gaps in the mating surface through the elastic deformation of the first sealing ring 15, the second sealing ring 16, and the third sealing ring 17, which can adaptively compensate for fluctuations in the oil pressure inside the box, forming a 360° closed barrier; in the dynamic seal, the first skeleton oil seal 8 on the vertical axis side intercepts lubricating oil with the clamping force of the lip, the first nitrile rubber sealing ring 7 on the outer large hole 5 prevents leakage at the edge of the gland 9, the second skeleton oil seal 13 on the horizontal axis side blocks oil leakage, and the polyurethane dustproof lip 14 filters dust; all the seals work together to block oil leakage and isolate external pollution. During maintenance, replacing the static seal simply requires unscrewing the first bolt 4 to separate the side cover 3, directly removing it from the sealing groove and replacing the sealing ring. Then, realign and reassemble using the positioning pin 18. For replacing the dynamic seal, unscrew the second bolt 10 on the vertical shaft side to remove the pressure cover 9, replace the first nitrile rubber sealing ring 7 and the first skeleton oil seal 8, and then reassemble the pressure cover 9. On the horizontal shaft side, remove the sealing seat 11 to replace the internal seal. The entire process does not require disassembling the gear shaft system. The sealing performance can be restored by reassembling using the positioning pin 18 and the first bolt 4 and the second bolt 10, which greatly improves the sealing performance of the gearbox.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealed housing structure for an L-shaped gearbox, comprising a first frame (1), characterized in that: A second frame (2) is fitted to one side of the first frame (1), a side cover (3) is attached to one side of the second frame (2), a first bolt (4) is slidably connected to one side of the side cover (3), an outer large hole (5) is opened at one end of the upper surface of the second frame (2), and an inner small hole (6) is opened at the other end of the upper surface of the second frame (2). A first nitrile rubber sealing ring (7) is fitted to the surface of the outer large hole (5), and a first skeleton oil seal (8) is fitted to the surface of the inner small hole (6). A pressure cap (9) is attached to the surface of the hole (5). A second bolt (10) is movably sleeved on one end of the pressure cap (9). A sealing seat (11) is attached to one side of the first frame (1). A second nitrile rubber sealing ring (12) is fitted to one side of the surface of the sealing seat (11). A second skeleton oil seal (13) is fitted to one side of the inner wall surface of the sealing seat (11). A polyurethane dustproof lip (14) is fitted to one end of the sealing seat (11). A positioning pin (18) is fixedly connected to the other side of the first frame (1).

2. The sealing housing structure of an L-shaped gearbox according to claim 1, characterized in that: A first sealing ring (15) is fitted and connected to one side of the first frame (1), a second sealing ring (16) is fitted and connected to one side of the side cover (3), and a third sealing ring (17) is fitted and connected to one side of the second frame (2).

3. The sealing housing structure of an L-shaped gearbox according to claim 1, characterized in that: Both the first frame (1) and the second frame (2) are threadedly connected to the first bolt (4).

4. The sealing housing structure of an L-shaped gearbox according to claim 1, characterized in that: The first nitrile rubber sealing ring (7) is fitted with the gland (9).

5. The sealing housing structure of an L-shaped gearbox according to claim 1, characterized in that: Both the first frame (1) and the second frame (2) are threadedly connected to the second bolt (10).

6. The sealing housing structure of an L-shaped gearbox according to claim 1, characterized in that: The positioning pin (18) is fitted and connected to the second frame (2).

7. The sealing housing structure of an L-shaped gearbox according to claim 2, characterized in that: The second sealing ring (16) is fitted and connected to the first frame (1).

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