Main shaft lower part sealing mechanism

Abstract

The utility model relates to the technical field of mechanical transmission, in particular to a sealing mechanism for the lower portion of a spindle. Comprising a main shaft, a bearing, a round nut, a lower sealing cover, a cover plate, a wear-resistant sleeve and an oil seal, the bearing is fixed to the main shaft in an interference fit mode, and axial positioning is achieved through a shaft shoulder of the main shaft and the round nut; the lower sealing cover is fixed on the bearing cylinder through a bolt, an oil seal is mounted in the lower sealing cover and is of a double-lip structure, the outer surface of the oil seal is matched with the lower sealing cover, and an inner lip is in contact with a wear-resistant sleeve which is in interference fit with the main shaft; the cover plate is fixed to the lower portion of the lower sealing cover through bolts and used for axially limiting the oil seal. A double-lip oil seal is adopted to replace a traditional double-lip and single-lip oil seal combination, the double-lip structure is evenly stressed in a hydraulic oil circulation system, the sealing contact area is larger, and the oil leakage risk is effectively reduced; the oil seal is located in the lower sealing cover and is prevented from being directly exposed in a high-pressure oil environment, displacement of the oil seal is further prevented through axial limiting of the cover plate, and long-term sealing stability is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, specifically to a sealing mechanism for the lower part of a main shaft. Background Technology

[0002] In the field of mechanical transmission, the spindle sealing structure is crucial to the stability and lifespan of equipment operation. Traditional spindle lower sealing mechanisms generally suffer from the following technical defects:

[0003] like Figure 2 As shown, in the prior art, the oil seal is directly exposed to the high-pressure environment of the hydraulic oil circulation system. Oil pressure fluctuations can easily force the oil seal to shift, causing sealing failure and oil leakage, which seriously affects the lubrication effect and operational safety of the equipment.

[0004] Traditional sealing structures require disassembling the lower sealing plate or using destructive methods such as flame cutting when replacing oil seals or wear sleeves. This is cumbersome and can easily damage the spindle and surrounding components, resulting in high maintenance costs and low efficiency.

[0005] Some structures use a combination of double single-lip oil seals. Uneven force during installation can easily lead to increased local wear, and it is impossible to monitor or replace a damaged oil seal individually, further shortening the service life of the sealing system. Utility Model Content

[0006] This utility model provides a sealing mechanism for the lower part of the spindle, which aims to improve sealing performance, optimize the replacement process of vulnerable parts, and enhance the stability and durability of the overall structure.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A lower sealing mechanism for a spindle includes a spindle, bearings, a round nut, a lower sealing cover, a cover plate, a wear-resistant sleeve, and an oil seal.

[0009] The bearing is fixed to the spindle by an interference fit and is axially positioned by the spindle shoulder and round nut.

[0010] The lower sealing cover is bolted to the bearing cylinder, and an oil seal is installed inside it. The oil seal has a double lip structure, with the outer surface fitting with the lower sealing cover and the inner lip contacting the wear-resistant sleeve of the spindle with an interference fit.

[0011] The cover plate bolts are fixed below the lower sealing cover and are used to axially limit the oil seal;

[0012] The wear-resistant sleeve and the lower sealing cover form a linkage disassembly structure, and the wear-resistant sleeve is pushed away from the main shaft by moving the lower sealing cover downward.

[0013] Furthermore, the round nut is screwed onto the main shaft via threads and abuts against the bearing end face to form a locking structure to enhance the synchronization between the bearing and the main shaft.

[0014] Furthermore, the oil seal is located inside the lower sealing cover, and its double-lip structure does not directly contact the oil pressure in the hydraulic oil circulation system, and is fixed by the cover plate to prevent displacement.

[0015] Furthermore, the bearing is a tapered roller bearing.

[0016] The beneficial effects achieved by this utility model are as follows:

[0017] The traditional combination of double single-lip oil seals is replaced by a double-lip oil seal. The double-lip structure is subjected to uniform force in the hydraulic oil circulation system, and the sealing contact area is larger, which effectively reduces the risk of oil leakage. The oil seal is located inside the lower sealing cover, avoiding direct exposure to the high-pressure oil environment. The axial limit of the cover plate further prevents the oil seal from shifting, ensuring long-term sealing stability.

[0018] The wear-resistant sleeve and the lower sealing cover adopt a linked disassembly structure. Simply pull down the lower sealing cover with a simple pulling device, and the wear-resistant sleeve can be pushed off the spindle by its shoulder. No flame cutting or heating is required, avoiding damage to the spindle and related components. Replacing the oil seal only requires removing the cover plate, simplifying the operation process, significantly shortening maintenance time and reducing labor costs.

[0019] The double-lip structure of the oil seal can maintain stable sealing performance under high pressure environment and adapt to the dynamic pressure changes of the hydraulic oil circulation system; the lower sealing cover forms a protective barrier for the oil seal, avoiding direct impact from oil pressure and reducing the risk of seal failure. Attached Figure Description

[0020] 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 drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is an overall structural diagram of the lower sealing mechanism of the main shaft in this application;

[0022] Figure 2 This is a diagram of the existing spindle lower sealing mechanism;

[0023] In the diagram, 1. Main shaft; 2. Bearing; 3. Round nut; 4. Lower sealing cover; 5. Cover plate; 6. Wear-resistant sleeve; 7. Oil seal; 8. Bearing cylinder; 9. Spacer ring; 10. Oil seal sleeve; 11. Lower oil receiving pan.

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] 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.

[0026] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] like Figure 1 As shown, a lower sealing mechanism for a main shaft 1 includes a main shaft 1, a bearing 2, a round nut 3, a lower sealing cover 4, a cover plate 5, a wear-resistant sleeve 6, and an oil seal 7.

[0029] The spindle 1 provides an axial positioning reference for the bearing 2 through the shoulder structure, and locks the bearing 2 with the round nut 3 to ensure that the spindle 1 and the bearing 2 rotate synchronously and reduce wear caused by motion deviation.

[0030] The bearing 2 is fixed to the spindle 1 by interference fit and is axially positioned by the spindle 1 shoulder and the round nut 3; the bearing 2 supports the rotation of the spindle 1, reduces frictional resistance, and ensures transmission accuracy.

[0031] The lower sealing cover 4 is bolted to the bearing cylinder 8, and an oil seal 7 is installed inside it. The oil seal 7 has a double lip structure, with its outer surface fitting with the lower sealing cover 4 and its inner lip contacting the wear-resistant sleeve 6 of the main shaft 1 with an interference fit.

[0032] The cover plate 5 is bolted to the bottom of the lower sealing cover 4 and is used to axially limit the oil seal 7.

[0033] The wear-resistant sleeve 6 and the lower sealing cover 4 form a linkage disassembly structure. By moving the lower sealing cover 4 downward, the wear-resistant sleeve 6 is pushed away from the main shaft 1.

[0034] The round nut 3 is screwed onto the main shaft 1 via threads, abutting against the end face of the bearing 2 to form a locking structure that enhances the synchronization between the bearing 2 and the main shaft 1. The round nut 3 axially locks the bearing 2, further enhancing the synchronization between the main shaft 1 and the bearing 2.

[0035] The oil seal 7 is located inside the lower sealing cover 4. Its double-lip structure does not come into direct contact with the oil pressure in the hydraulic oil circulation system, and it is fixed by the cover plate 5 to prevent displacement.

[0036] The bearing 2 is a tapered roller bearing 2, which can withstand radial and axial forces.

[0037] The lower sealing cover 4 is fixed to the bearing cylinder 8 by bolts, providing installation space for the oil seal 7; its internal shoulder contacts the wear-resistant sleeve 6. When disassembling, pull down the lower sealing cover 4 and use the shoulder thrust to push the wear-resistant sleeve 6 out of the main shaft 1 to achieve disassembly without damage.

[0038] The cover plate 5 axially limits the oil seal 7, simplifying the oil seal 7 replacement process. It is fixed to the bottom of the lower sealing cover 4 with bolts to press the oil seal 7 to prevent its axial displacement. During disassembly, only the cover plate 5 needs to be removed to directly replace the oil seal 7.

[0039] The wear-resistant sleeve 6 serves as the mating surface of the oil seal 7, protecting the spindle 1 from wear. It is fixed to the surface of the spindle 1 by interference fit and forms a dynamic seal with the inner lip of the oil seal 7. As a vulnerable part, it can be disassembled along with the lower sealing cover 4 after wear, avoiding damage to the spindle 1 caused by traditional flame cutting.

[0040] The oil seal 7 prevents lubricating oil leakage and the intrusion of external contaminants. It adopts a double-lip structure, with the outer lip and the lower sealing cover 4 providing a static seal, and the inner lip and the wear-resistant sleeve 6 providing a dynamic seal, forming double protection; the double-lip design ensures uniform stress distribution, adapts to high pressure fluctuations, and is limited by the cover plate 5 to prevent displacement, ensuring long-term sealing performance.

[0041] The double-lip structure of oil seal 7 forms a dynamic seal on the surface of wear-resistant sleeve 6, while the lower sealing cover 4 isolates the hydraulic oil from direct impact, ensuring sealing stability under high pressure. The round nut 3 and the shoulder of spindle 1 together lock bearing 2, eliminating relative movement between spindle 1 and bearing 2 and improving transmission accuracy. When replacing oil seal 7, only cover plate 5 needs to be removed; there is no need to disassemble bearing 2 or the lower sealing oil pan. When replacing wear-resistant sleeve 6, pulling down the lower sealing cover 4 and using its shoulder to push wear-resistant sleeve 6 away from spindle 1 eliminates the need for destructive operations, significantly simplifying the maintenance process.

[0042] like Figure 2 As shown, the spindle 1 and bearing 2 are prone to asynchronous movement, causing wear on the spindle 1; for example... Figure 1 As shown, the spindle 1 and bearing 2 are fitted together, and a locking nut is used to strengthen the fit between bearing 2 and spindle 1 to ensure the synchronization of movement.

[0043] The spindle 1 is internally lubricated by circulating hydraulic oil at high pressure. Figure 2 As shown, oil seal 7 directly faces the pressure of hydraulic oil. Unstable oil pressure can easily cause oil seal 7 to move, leading to oil leakage from the equipment. (See right image) Figure 1 As shown, the oil seal 7 is located under the protection of the lower sealing cover 4, and will not be directly exposed to oil pressure. It is also fixed by the cover plate 5, so it will not move during long-term use.

[0044] Oil seal 7 and wear-resistant sleeve 6 are consumable parts and must be replaced by the customer. Figure 2 As shown, when replacing oil seal 7, the lower oil sealing plate must be removed. The installation of the lower oil seal 7 requires careful consideration of its sealing mechanism. Figure 1 As shown, replacing oil seal 7 only requires removing cover plate 5, making parts replacement convenient.

[0045] like Figure 2 As shown, a double single-lip oil seal 7 is used. During installation, the two oil seals 7 are prone to uneven stress, resulting in different degrees of wear. Damage to the first oil seal 7 cannot be observed in time, making individual replacement inconvenient. For example... Figure 1 As shown, a single double-lip oil seal 7 experiences stable oil pressure, uniform force, and a stable working environment.

[0046] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A lower sealing mechanism for a main shaft, comprising a main shaft (1), a bearing (2), a round nut (3), a lower sealing cover (4), a cover plate (5), a wear-resistant sleeve (6), and an oil seal (7), characterized in that: The bearing (2) is fixed to the spindle (1) by interference fit and is axially positioned by the spindle shoulder and round nut (3); The lower sealing cover (4) is bolted to the bearing cylinder, and an oil seal (7) is installed inside it. The oil seal (7) has a double lip structure. The outer surface fits with the lower sealing cover (4), and the inner lip contacts the wear-resistant sleeve (6) of the spindle (1) which is interference-fitted. The cover plate (5) is bolted to the bottom of the lower sealing cover (4) to axially limit the oil seal (7); The wear-resistant sleeve (6) and the lower sealing cover (4) form a linkage disassembly structure. The wear-resistant sleeve (6) is pushed away from the main shaft (1) by moving the lower sealing cover (4) downward.

2. The lower sealing mechanism of the spindle according to claim 1, characterized in that: The round nut (3) is screwed onto the main shaft (1) by the thread and abuts against the end face of the bearing (2) to form a locking structure to enhance the synchronization between the bearing (2) and the main shaft (1).

3. The lower sealing mechanism of the spindle according to claim 1, characterized in that: The oil seal (7) is located inside the lower sealing cover (4). Its double-lip structure does not come into direct contact with the oil pressure in the hydraulic oil circulation system and is fixed by the cover plate (5) to prevent displacement.

4. The lower sealing mechanism of the spindle according to claim 1, characterized in that: The bearing (2) is a tapered roller bearing.

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