A sealing ring for a cylinder
Patent Information
- Application Number
- CN202522222498.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-18
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-10-18
AI Technical Summary
密封圈在频繁承受这种冲击后，其结构完整性会遭到破坏，出现局部磨损、变形甚至破裂等情况，导致密封性能下降，油缸内的油液出现泄漏现象，同时也减少了密封圈的使用寿命
一种用于油缸的密封圈，包括安装于缸体和端盖位置处的密封圈本体，密封圈本体远离端盖一侧开设有环形的缓冲槽，缓冲槽内设置有多个结构相同的缓冲组件；所述缓冲组件包括开设于密封圈本体上的缓冲腔，缓冲腔内设置有缓冲弹簧，缓冲弹簧的端部固定连接有缓冲杆，缓冲杆远离缓冲弹簧的端部固定连接有缓冲端板，缓冲杆和缓冲腔的内壁之间形成供油穿过的间隙。通过采用上述技术方案，用户使用时，当活塞向端盖一侧滑动时，活塞推动液压油向缓冲腔内滑动，缓冲腔经间隙进去到缓冲腔内，液压油能够对缓冲杆和缓冲弹簧起到一定的阻尼作用，当活塞向密封圈运动后，密封圈内的缓冲油能够起到缓冲和支撑缓冲杆的作用，同时缓冲弹簧的形变也能起到缓冲的作用，进而减小活塞对连接杆的冲击，不影响密封圈的使用寿命，还能减少液压油泄露。优选的，所述密封圈本体内开设有导油通道，导油通道的一端与缓冲腔内连通，另一端延伸至密封圈本体和活塞的连接处。通过采用上述技术方案，用户使用时，活塞向密封圈的方向运动，活塞挤压液压油，密封圈和活塞之间的液压油经导油通道进入到缓冲腔内，对缓冲杆起到反向的支撑力，从而增大缓冲杆对活塞的抵抗力，减少活塞对密封圈的冲击。优选的，所述缓冲杆和缓冲端板为橡胶材料制成。通过采用上述技术方案，用户使用时，缓冲杆和缓冲端板在受到外力作用时，缓冲杆和缓冲端板能够发生形变，从而抵消一部分冲击力。优选的，所述缓冲端板上开设有锥形面。通过采用上述技术方案，用户使用时，锥形面相较于平面或其他常规形状的端面，能更顺滑地引导液压油的流向，锥形面可以将集中的冲击力沿锥面的各个方向进行分散。优选的，所述缓冲杆的上开设有一个过油孔，过油孔用于将缓冲杆两侧的间隙连通。通过采用上述技术方案，用户使用时，过油孔在液压油进入缓冲腔后，若无过油通道，液压油在缓冲杆周围聚集，容易在局部区域形成过高的压力，而开设过油孔后，液压油能够通过该孔进行合理的分流，使缓冲腔内不同位置的液压油得以重新分布，有效避免压力在缓冲杆周围某一处过度积聚，让整个缓冲腔的压力分布更加均匀、平稳，从而保障缓冲过程能稳定且有序地进行，缓冲腔内压力出现较大波动，在活塞快速运动产生较大冲击时，过油孔可作为一个额外的压力释放途径。优选的，所述缓冲杆的中部开设有一个过油通道。通过采用上述技术方案，用户使用时，液压油能够通过该通道进行流通，便于液压油进入到缓冲腔内，缓冲腔内压力出现较大波动，在活塞快速运动产生较大冲击时，过油孔可作为一个额外的压力释放途径。优选的，所述密封圈靠近端盖的一端设置有橡胶密封环。通过采用上述技术方案，用户使用时，密封圈能够对油缸与端盖之间较大的缝隙起到密封作用，但在一些微观层面，仍可能存在微小的间隙，橡胶密封环质地相对柔软且具有良好的弹性，能够凭借自身的可变形特性，填充这些微观的不规则间隙，进一步阻止液压油从这些细微之处泄漏出去，从而大大提升了整个密封系统的密封严密程度，确保油缸在高压的液压油环境下依然能保持良好的密封性。优选的，所述密封圈靠近端盖一侧开设有多个环形的凹槽。通过采用上述技术方案，用户使用时，压油的压力变化以及活塞的往复运动等因素，可能会使密封圈受到不同程度的液压冲击。环形凹槽能够在一定程度上起到缓冲作用，当液压冲击传递过来时，凹槽内的空间可以容纳一部分液压油，使得液压油的冲击力在这些凹槽区域得到分散和缓冲，避免冲击力直接作用在密封圈的主体结构上，减轻了密封圈因冲击而遭受的损坏，延长了密封圈的使用寿命，形凹槽为这种变形提供了一定的容纳空间，使得密封圈能够更好地顺应这些变形情况，依然保持与密封面的有效贴合，在缓冲变形带来的影响的同时，持续维持良好的密封状态，保障油缸的密封性能稳定。
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Figure CN224648871U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of sealing, and in particular to a sealing ring for hydraulic cylinders. Background Technology
[0002] In modern industry, hydraulic systems are widely used in various types of machinery due to their advantages, such as the ability to output large forces and precisely control motion. As a key actuator in hydraulic systems, the hydraulic cylinder converts hydraulic energy into mechanical energy to drive loads to perform corresponding actions, playing a vital role in industrial production and greatly improving production efficiency and equipment automation. Its applications cover numerous fields, including engineering machinery, metallurgical equipment, and aerospace, driving technological development and progress across various industries.
[0003] Typically, a hydraulic cylinder consists mainly of a cylinder barrel, piston, piston rod, and end caps. The piston reciprocates inside the cylinder barrel to achieve various mechanical actions such as lifting and pushing. Inside the cylinder, both sides of the piston are filled with hydraulic fluid. During operation, according to specific operating commands, hydraulic pressure is applied to one side of the piston's oil chamber, causing the piston to push to the other side under the influence of the pressure difference, thus driving the external load connected to the piston rod to move accordingly. Simultaneously, a sealing ring is installed at the connection between the cylinder and the end cap to prevent hydraulic fluid from leaking out through the gap between the cylinder barrel and the end cap, ensuring that the hydraulic system can operate stably in a relatively sealed environment.
[0004] However, during the piston's reciprocating motion, as the piston approaches the sealing ring located at the connection between the cylinder and the end cap, changes in oil distribution and specific hydrodynamic effects near the sealing ring gradually reduce the resistance that initially hindered the piston's movement. At this point, the piston collides with the sealing ring at a relatively high speed, generating a strong impact. After frequent exposure to such impacts, the sealing ring's structural integrity is compromised, leading to localized wear, deformation, or even cracking. This results in decreased sealing performance, oil leakage within the cylinder, and a reduced lifespan for the sealing ring. Utility Model Content
[0005] The purpose of this application is to overcome the above-mentioned technical problems and provide a sealing ring for hydraulic cylinders. A sealing ring for a hydraulic cylinder includes a sealing ring body installed at the cylinder body and end cap. An annular buffer groove is formed on the side of the sealing ring body away from the end cap, and multiple identical buffer components are arranged within the buffer groove. Each buffer component includes a buffer cavity formed on the sealing ring body, a buffer spring disposed within the buffer cavity, a buffer rod fixedly connected to the end of the buffer spring, and a buffer end plate fixedly connected to the end of the buffer rod away from the buffer spring. A gap is formed between the buffer rod and the inner wall of the buffer cavity for oil to pass through. By adopting the above technical solution, when the piston slides towards the end cap, the piston pushes hydraulic oil into the buffer cavity. The hydraulic oil enters the buffer cavity through the gap, providing a certain damping effect on the buffer rod and buffer spring. When the piston moves towards the sealing ring, the buffer oil within the sealing ring buffers and supports the buffer rod. Simultaneously, the deformation of the buffer spring also provides a buffering effect, thereby reducing the impact of the piston on the connecting rod, not affecting the service life of the sealing ring, and reducing hydraulic oil leakage. Preferably, the sealing ring body has an oil guiding channel, one end of which communicates with the buffer chamber, and the other end extends to the connection between the sealing ring body and the piston. By adopting the above technical solution, when the user uses the device, the piston moves towards the sealing ring, compressing the hydraulic oil. The hydraulic oil between the sealing ring and the piston enters the buffer chamber through the oil guiding channel, providing a reverse supporting force to the buffer rod, thereby increasing the buffer rod's resistance to the piston and reducing the piston's impact on the sealing ring. Preferably, the buffer rod and buffer end plate are made of rubber. By adopting the above technical solution, when the user uses the device, the buffer rod and buffer end plate can deform under external force, thereby offsetting part of the impact force. Preferably, the buffer end plate has a conical surface. By adopting the above technical solution, when the user uses the device, the conical surface, compared to a flat surface or other conventionally shaped end face, can more smoothly guide the flow of hydraulic oil, and the conical surface can disperse the concentrated impact force along various directions of the conical surface. Preferably, the buffer rod has an oil passage hole on its upper part, which connects the gaps on both sides of the buffer rod. By adopting the above technical solution, when the hydraulic oil enters the buffer chamber, if there is no oil passage, the hydraulic oil will accumulate around the buffer rod, easily forming excessively high pressure in a local area. With the oil passage hole, the hydraulic oil can be reasonably distributed through the hole, allowing the hydraulic oil in different positions within the buffer chamber to be redistributed, effectively preventing excessive pressure accumulation around the buffer rod, making the pressure distribution in the entire buffer chamber more uniform and stable. This ensures that the buffering process can proceed stably and orderly. When there are large pressure fluctuations within the buffer chamber, such as when the piston moves rapidly and generates a large impact, the oil passage hole can serve as an additional pressure release path. Preferably, the buffer rod has an oil passage hole in its middle part.By adopting the above technical solution, hydraulic oil can flow through this channel during user operation, facilitating its entry into the buffer chamber. When the pressure within the buffer chamber fluctuates significantly, and the piston experiences rapid movement and generates substantial impact, the oil passage serves as an additional pressure release pathway. Preferably, a rubber sealing ring is provided at the end of the sealing ring near the end cap. With this technical solution, the sealing ring can seal larger gaps between the cylinder and the end cap during user operation. However, at some microscopic levels, tiny gaps may still exist. The relatively soft and elastic rubber sealing ring, with its deformable properties, can fill these microscopic irregular gaps, further preventing hydraulic oil leakage from these minute areas. This significantly improves the sealing tightness of the entire sealing system, ensuring the cylinder maintains good sealing performance even under high-pressure hydraulic oil conditions. Preferably, the sealing ring has multiple annular grooves on the side near the end cap. With this technical solution, during user operation, factors such as changes in hydraulic oil pressure and the reciprocating motion of the piston may subject the sealing ring to varying degrees of hydraulic shock. The annular groove can play a buffering role to a certain extent. When hydraulic shock is transmitted, the space inside the groove can accommodate some hydraulic oil, so that the impact force of the hydraulic oil is dispersed and buffered in these groove areas, avoiding the impact force from acting directly on the main structure of the sealing ring, reducing the damage to the sealing ring caused by the impact, and extending the service life of the sealing ring. The annular groove provides a certain space to accommodate this deformation, so that the sealing ring can better adapt to these deformations and still maintain effective contact with the sealing surface. While buffering the impact of deformation, it continuously maintains a good sealing state and ensures the stable sealing performance of the hydraulic cylinder. Attached Figure Description
[0006] Figure 1 This is a cross-sectional view of the sealing ring installed inside the oil cylinder according to an embodiment of this application; Figure 2 This is a cross-sectional view of the sealing ring according to an embodiment of this application; Figure 3 yes Figure 2 Enlarged view of part A.
[0007] Explanation of reference numerals in the attached drawings: 1. Cylinder body; 2. End cap; 3. Piston; 4. Sealing ring body; 41. Buffer groove; 42. Buffer assembly; 421. Buffer spring; 422. Buffer rod; 423. Buffer end plate; 424. Oil passage hole; 425. Oil passage; 43. Buffer chamber; 431. Gap; 44. Oil guide channel; 45. Rubber sealing ring; 46. Groove. Detailed Implementation
[0008] The following will be combined with the appendix Figure 1-3The technical solutions in the embodiments of this utility model are described in further detail below. The described embodiments are only possible technical implementations of this utility model, but are not limited thereto. Other embodiments obtained by those skilled in the art in conjunction with the embodiments of this utility model without creative effort are also within the protection scope of this utility model.
[0009] This application mainly adopts a scheme of setting buffer components and channels in the sealing ring, which achieves the effects of reducing the impact of the piston on the sealing ring, reducing hydraulic oil leakage, and extending the service life of the sealing ring. The following is a further detailed description of this application. An embodiment of this application provides a sealing ring for a hydraulic cylinder, including a sealing ring body 4 installed at the positions of the cylinder body 1 and the end cover 2. An annular buffer groove 41 is formed on the side of the sealing ring body 4 away from the end cover 2. Multiple buffer components 42 with identical structures are arranged in the buffer groove 41. This arrangement achieves the effects of buffering the impact of the piston 3 on the sealing ring, reducing hydraulic oil leakage, and extending the service life of the sealing ring. This is because the buffer components 42 can buffer and disperse the impact force of the piston 3 when it approaches the sealing ring, thereby protecting the sealing ring.
[0010] Specifically, the buffer assembly 42 includes a buffer cavity 43 opened on the sealing ring body 4, a buffer spring 421 is provided in the buffer cavity 43, a buffer rod 422 is fixedly connected to the end of the buffer spring 421, a buffer end plate 423 is fixedly connected to the end of the buffer rod 422 away from the buffer spring 421, and a gap 431 for oil supply is formed between the buffer rod 422 and the inner wall of the buffer cavity 43.
[0011] The buffer chamber 43 is characterized by its smooth inner wall to reduce resistance to oil flow. An alternative feature could be that the inner wall of the buffer chamber 43 has a structure with minute protrusions or grooves 46 to increase the turbulence effect of the oil and improve buffering performance.
[0012] 421 buffer springs generally use helical springs, typically made of spring steel, which possesses good elasticity and strength. Their construction features a specific number of coils and spring constant to ensure appropriate deformation and restoring force under pressure. Replaceable features include disc springs or rubber springs to adapt to different cushioning requirements.
[0013] The buffer bar 422 is typically cylindrical and made of rubber. The use of rubber provides good elasticity and cushioning performance. The buffer bar 422 is usually connected to the buffer spring 421 by welding or snap-fit to ensure a secure connection. An alternative feature could be that the buffer bar 422 is designed with a flexible expansion joint to further improve the cushioning effect.
[0014] The buffer end plate 423 has a tapered surface. The tapered surface is characterized by its cone-shaped surface that gradually slopes from the center to the edge. This shape, compared to a flat or other conventionally shaped end face, guides the flow of hydraulic oil more smoothly. When the piston 3 impacts the buffer end plate 423, the tapered surface disperses the concentrated impact force in various directions, thereby reducing the localized pressure on the buffer end plate 423 and the sealing ring.
[0015] The combination logic of these components is as follows: When piston 3 slides towards end cap 2, piston 3 pushes hydraulic oil into buffer chamber 43. The hydraulic oil enters buffer chamber 43 through the gap 431 between buffer rod 422 and the inner wall of buffer chamber 43, providing a certain damping effect on buffer rod 422 and buffer spring 421. When piston 3 moves towards the sealing ring, the buffer oil in the sealing ring can buffer and support buffer rod 422, and the deformation of buffer spring 421 can also buffer, thereby reducing the impact of piston 3 on sealing ring.
[0016] Specifically, an oil guide channel 44 is provided inside the sealing ring body 4. One end of the oil guide channel 44 communicates with the buffer chamber 43, and the other end extends to the connection between the sealing ring body 4 and the piston 3. The oil guide channel 44 is typically cylindrical with a smooth inner wall to reduce resistance to oil flow. The oil guide channel 44 is designed to allow hydraulic oil between the sealing ring and the piston 3 to enter the buffer chamber 43, providing a reverse support force to the buffer rod 422, thereby increasing the resistance of the buffer rod 422 to the piston 3 and reducing the impact of the piston 3 on the sealing ring. An alternative feature could be that the oil guide channel 44 is designed with a branched or curved structure to increase the oil flow path and improve the buffering effect.
[0017] The buffer rod 422 and buffer end plate 423 are made of rubber. Rubber has good elasticity and cushioning properties; when subjected to external force, the buffer rod 422 and buffer end plate 423 can deform, thereby offsetting part of the impact force. The choice of rubber material can be based on the specific usage environment and requirements. For example, nitrile rubber has good oil resistance, and fluororubber has good high-temperature resistance and chemical corrosion resistance. Using rubber for the buffer rod 422 and buffer end plate 423 further improves the cushioning performance of the buffer assembly 42. During piston 3 impact, the deformation of the rubber material can more effectively absorb and disperse the impact force, reducing damage to the sealing ring. Compared with the above embodiment, this embodiment further improves the cushioning effect, better protects the sealing ring, and extends its service life.
[0018] An oil passage hole 424 is provided on the upper part of the buffer rod 422 to connect the gaps 431 on both sides of the buffer rod 422. The oil passage hole 424 is usually circular in shape, and its diameter is determined according to specific design requirements. The function of the oil passage hole 424 is to allow the oil on both sides of the buffer rod 422 to flow between each other, avoiding excessive pressure in a local area. When hydraulic oil enters the buffer chamber 43, if there is no oil passage 425, the hydraulic oil will accumulate around the buffer rod, which can easily lead to uneven pressure distribution. After the oil passage hole 424 is provided, the hydraulic oil can be reasonably distributed through the hole, so that the hydraulic oil in different positions in the buffer chamber 43 can be redistributed, effectively preventing excessive pressure accumulation in a certain place around the buffer rod. A rubber sealing ring 45 is provided at the end of the sealing ring near the end cover 2, and multiple annular grooves 46 are provided on the side of the sealing ring near the end cover 2.
[0019] An oil passage 425 is provided in the middle of the buffer rod, through which hydraulic oil can flow and enter the buffer chamber 43. When the pressure in the buffer chamber 43 fluctuates greatly, the oil passage 424 can serve as an additional pressure release path when the piston 3 moves rapidly and generates a large impact.
[0020] The rubber sealing ring 45 is relatively soft and has good elasticity. Its deformability allows it to fill the irregular microscopic gaps 431 between the cylinder and the end cap 2, further preventing hydraulic oil leakage from these tiny areas. The annular groove 46 provides a buffering effect. When hydraulic shocks are transmitted, the space within the groove 46 can hold a portion of the hydraulic oil, dispersing and buffering the impact force in these groove areas. This prevents the impact force from directly acting on the main structure of the sealing ring, reducing damage caused by impact.
[0021] The implementation principle of this embodiment is as follows: By incorporating the buffer assembly 42 and the oil guide channel 44, the sealing ring of this embodiment can effectively buffer the impact of the piston 3 on the sealing ring, reduce hydraulic oil leakage, and extend the service life of the sealing ring. During the movement of the piston 3, the flow of hydraulic oil and the deformation of the buffer spring 421 work together to disperse and absorb the impact force of the piston 3, thereby protecting the structural integrity of the sealing ring and improving the stability and reliability of the hydraulic system. Compared with the prior art, the sealing ring of this embodiment has significantly improved in terms of buffering and sealing performance, solving the problem that existing sealing rings are easily damaged by the impact of the piston 3.
[0022] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A seal ring for a cylinder, comprising a seal ring body (4) mounted in position in a cylinder body (1) and an end cap (2), characterized in that: A ring-shaped buffer groove (41) is provided on the side of the sealing ring body (4) away from the end cap (2). Multiple buffer components (42) with the same structure are provided in the buffer groove (41). The buffer component (42) includes a buffer cavity (43) opened on the sealing ring body (4). A buffer spring (421) is provided in the buffer cavity (43). A buffer rod (422) is fixedly connected to the end of the buffer spring (421). A buffer end plate (423) is fixedly connected to the end of the buffer rod (422) away from the buffer spring (421). A gap (431) for oil to pass through is formed between the buffer rod (422) and the inner wall of the buffer cavity (43).
2. A sealing ring for a hydraulic cylinder according to claim 1, characterized in that: The sealing ring body (4) has an oil guide channel (44) inside. One end of the oil guide channel (44) is connected to the buffer cavity (43), and the other end extends to the connection between the sealing ring body (4) and the piston (3).
3. A sealing ring for a hydraulic cylinder according to claim 1, characterized in that: The buffer rod (422) and the buffer end plate (423) are made of rubber material.
4. A sealing ring for a hydraulic cylinder according to claim 1, characterized in that: The buffer end plate (423) has a tapered surface.
5. A sealing ring for a hydraulic cylinder according to claim 1, characterized in that: An oil passage hole (424) is provided on the upper part of the buffer rod (422), which is used to connect the gap (431) on both sides of the buffer rod (422).
6. A sealing ring for a hydraulic cylinder according to claim 1, characterized in that: An oil passage (425) is provided in the middle of the buffer rod.
7. A sealing ring for a hydraulic cylinder according to claim 1, characterized in that: A rubber sealing ring (45) is provided at one end of the sealing ring near the end cap (2).
8. A sealing ring for a hydraulic cylinder according to claim 1, characterized in that: The sealing ring has multiple annular grooves (46) on the side near the end cap (2).