A long-lasting hydraulic cylinder seal resistant to wear

Abstract

The utility model discloses a kind of hydraulic oil cylinder sealing parts of wear resistance endurance, it is related to oil cylinder sealing part field, the utility model includes oil cylinder cover, the outer ring of oil cylinder cover is provided with recess in upper and lower ends, the recess inside is all provided with guide ring, the utility model is fixed mechanism by guide ring buckle and pin double to eliminate the risk of axial movement of component, by the cooperation of elastic buckle in opening and rigid pin in recess, realize rigid limit in radial direction, form elastic constraint in axial direction, prevent displacement accumulation caused by vibration, simultaneously, the design significantly reduces assembly difficulty, only need to unfold guide ring and buckle into cylinder cover recess, again buckle, insert pin is completed positioning, sealing ring embedded type locking structure creates dynamic self-adapting sealing environment, sealing ring convex part and double guide ring recess form four-sided enclosure, when oil pressure rises, force rubber material to produce controllable radial expansion, actively fill in cooperation gap, improve sealing property.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder seals, specifically a wear-resistant and durable hydraulic cylinder seal. Background Technology

[0002] Hydraulic cylinder seals are precision components installed in key parts of hydraulic cylinders to prevent hydraulic oil leakage and block external contaminants such as dust and moisture from entering the cylinder. They are a series of components with specific materials, shapes, and functions that work together to ensure the formation of an effective sealed chamber inside the cylinder for power transmission, while protecting the system from internal and external damage. They are the cornerstone of efficient, reliable, and long-life operation of hydraulic cylinders. Understanding the location, type, material, and function of different seals is crucial for design, selection, maintenance, and troubleshooting.

[0003] In existing hydraulic cylinder seals, a guide ring is fitted onto the outside of the cylinder head, and a sealing ring is fitted into the middle of the guide ring to seal and prevent oil leakage from the cylinder. The cylinder head is then installed in the desired position. However, after prolonged use, the guide ring and sealing ring may wobble, affecting the sealing effect and causing oil leakage from the cylinder. Therefore, the inventor urgently needs to design a device that can reinforce the guide ring and sealing ring to improve the sealing performance of the sealing ring. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a wear-resistant and durable hydraulic cylinder seal to solve the technical problem of reduced sealing performance of the sealing ring after long-term use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a wear-resistant and durable hydraulic cylinder seal, comprising a cylinder head, wherein the upper and lower ends of the outer ring of the cylinder head are provided with grooves, and each groove is provided with a guide ring, the outer ring of the guide ring having a convex structure, and a sealing ring being provided between the two guide rings, the inner ring of the sealing ring having a convex structure, and the convex structure of the sealing ring being engaged with the groove formed by the two guide rings.

[0006] By adopting the above technical solution, a double groove structure is set on the outer ring of the cylinder head, which provides a precise positioning reference for the guide ring, ensuring that the axial distance between the two guide rings is strictly controlled, avoiding the misalignment of the sealing ring due to assembly errors. The convex structure of the outer ring of the guide ring and the convex part of the inner ring of the sealing ring form a two-way mechanical interlocking mechanism, so that the radial displacement of the sealing ring is completely constrained in the rigid groove formed by the two guide rings.

[0007] Furthermore, the groove has several pin holes inside, and the upper part of the guide ring has several pins corresponding to the pin holes. The pin holes and pins are used to fix the position of the guide ring.

[0008] By adopting the above technical solution, the precision positioning system of the groove inner pin hole and the guide ring pin forms a double constraint in the axial and radial directions, so that the guide ring cannot rotate or deviate when subjected to hydraulic shock, which solves the defect of easy loosening of traditional interference fit. This rigid mechanical locking mechanism completely eliminates the fretting wear of the guide ring and avoids oil contamination caused by wear debris due to small displacement.

[0009] Furthermore, the guide ring is made of phenolic resin-reinforced fabric and polytetrafluoroethylene material, used to protect the sealing ring.

[0010] By adopting the above technical solutions, the phenolic fabric-reinforced matrix endows the guide ring with excellent dimensional stability and load-bearing capacity. Its laminated fiber structure can resist pressure without deformation, providing a solid support platform for the sealing ring. The addition of the polytetrafluoroethylene surface layer achieves a breakthrough in tribological performance: its self-lubricating properties reduce the friction coefficient of the dynamic seal, which not only reduces energy consumption but also significantly weakens the wear rate of the sealing ring.

[0011] Furthermore, one end of the guide ring is provided with an opening, which changes the shape of the guide ring.

[0012] By adopting the above technical solution, the single-end opening design of the guide ring breaks through the limitations of the traditional integral structure of the seal and simplifies the assembly process: the cylinder head can be installed simply by elastically expanding the opening of the guide ring, which greatly reduces the risk of assembly damage to precision components.

[0013] Furthermore, a snap-fit ​​structure is provided on the opposite side of the opening for connecting the guide ring.

[0014] By adopting the above technical solution, the snap-fit ​​structure forms a self-locking mechanism, which automatically locks the device the moment it is installed, generating a constant preload to compensate for manufacturing tolerances and eliminating the adjustment steps required by traditional structures.

[0015] Furthermore, the sealing ring is made of rubber to prevent cylinder oil leakage.

[0016] By adopting the above technical solution, the elastic-plastic deformation capability of rubber material establishes a dynamic adaptive sealing mechanism: under oil pressure fluctuations, the sealing ring compensates for the system gap in real time through controllable deformation, forming a leak-free contact pressure distribution. Its molecular chain entanglement structure endows it with the ability to self-repair damage. When microcracks are generated on the surface, the rubber molecules will reconstruct the cross-linked network under the effect of oil swelling, automatically filling the damaged area.

[0017] Furthermore, the cylinder head is made of alloy steel and is used to seal both ends of the cylinder barrel, providing sealing, guidance, and connection interfaces.

[0018] By adopting the above technical solutions, the alloy steel cylinder head achieves the characteristics of gradient functional materials through a special heat treatment process: the surface hardened layer resists the fretting wear of the guide ring, while the core tempered structure has impact toughness, eliminating the risk of groove deformation from the root. Its integrated design constructs a triple sealing barrier system: the static sealing surface between the cylinder head and the cylinder isolates external contaminants, the guide ring groove achieves precise positioning, and finally the sealing ring completes the dynamic sealing.

[0019] In summary, the present invention has the following main advantages:

[0020] This invention eliminates the risk of axial movement of components through a dual fixing mechanism of guide ring buckle and pin. The elastic buckle at the opening cooperates with the rigid pin in the groove to achieve rigid limitation in the radial direction and form elastic constraint in the axial direction, preventing the accumulation of displacement caused by vibration. At the same time, this design significantly reduces the assembly difficulty. It is only necessary to unfold the guide ring and insert it into the cylinder head groove, then fasten the buckle and insert the pin to complete the positioning. The embedded locking structure of the sealing ring creates a dynamic adaptive sealing environment. The protrusion of the sealing ring and the groove of the double guide ring form a four-sided enclosure, which forces the rubber material to produce controllable radial expansion when the oil pressure increases, actively filling the mating gap. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the cylinder head of the hydraulic cylinder of this utility model;

[0023] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the guide ring of this utility model;

[0025] Figure 5 This is a three-dimensional structural diagram of the sealing ring of this utility model;

[0026] Figure 6 This is a top view of the guide ring of this utility model.

[0027] Figure 7 This utility model Figure 6 A magnified structural diagram of point A in the middle.

[0028] In the diagram: 1. Cylinder head; 101. Groove; 102. Pin hole; 2. Guide ring; 201. Pin; 202. Opening; 203. Snap-fit ​​structure; 3. Sealing ring. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In this embodiment:

[0031] A wear-resistant and durable hydraulic cylinder seal, such as Figure 1-7 As shown, the cylinder head 1 includes a cylinder head with grooves 101 at both the upper and lower ends of its outer ring. Guide rings 2 are installed inside each groove 101. The outer ring of the guide rings 2 has a convex structure, and a sealing ring 3 is installed between the two guide rings 2. The inner ring of the sealing ring 3 has a convex structure. The convex structure of the sealing ring 3 engages with the groove formed by the two guide rings 2. The double-groove structure on the outer ring of the cylinder head provides a precise positioning reference for the guide rings, ensuring that the axial distance between the two guide rings is strictly controlled and avoiding misalignment of the sealing ring due to assembly errors. The convex structure of the outer ring of the guide ring and the inner ring of the sealing ring... The protrusion of the ring forms a two-way mechanical interlocking mechanism, which completely constrains the radial displacement of the sealing ring within the rigid groove formed by the two guide rings. At the same time, this nested design creates a multi-stage force transmission path under high-pressure oil impact: the hydraulic thrust first acts on the sealing ring, then is evenly distributed to the two guide rings through the protrusion structure, and finally the load is borne by the cylinder head groove, which significantly reduces the risk of local stress concentration. In addition, this structure achieves a fully enclosed fixation of the sealing ring, and even under long-term vibration conditions, the sealing ring and the guide ring still maintain zero relative displacement, completely eliminating the micro-leakage channel caused by shaking.

[0032] See Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 The groove 101 has several pin holes 102 inside, and the upper part of the guide ring 2 has several pins 201 corresponding to the pin holes 102. The pin holes 102 and pins 201 are used to fix the position of the guide ring 2. The precision positioning system of the pin holes and guide ring pins in the groove forms a double constraint in the axial and radial directions, so that the guide ring cannot rotate or shift when subjected to hydraulic shock, which solves the defect of easy loosening of traditional interference fit. This rigid mechanical locking mechanism completely eliminates the fretting wear of the guide ring and avoids oil contamination caused by wear debris due to small displacement. At the same time, the circumferentially distributed layout of multiple pins greatly improves the shear resistance. Even when the cylinder is subjected to asymmetrical load, the pin group can still share the load and prevent the failure of a single positioning point due to overload. This design also plays a role in thermal expansion self-adaptation under high temperature conditions: the micro gaps retained in the pin holes allow the material to expand without generating additional internal stress when heated, avoiding the risk of plastic deformation and significantly extending the service life of the guide ring under high temperature conditions.

[0033] See Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The guide ring 2 is made of phenolic resin and polytetrafluoroethylene (PTFE) and is used to protect the sealing ring 3. The phenolic resin matrix gives the guide ring excellent dimensional stability and load-bearing capacity. Its laminated fiber structure can resist pressure without deformation, providing a solid support platform for the sealing ring. The addition of the PTFE surface layer achieves a breakthrough in tribological performance: its self-lubricating properties reduce the friction coefficient of the dynamic seal, which not only reduces energy consumption but also significantly weakens the wear rate of the sealing ring. At the same time, the composite material has the advantage of chemical inert protection, maintaining its strength without decay under long-term corrosion of hydraulic oil containing additives. Its unique layered structure also forms an energy dissipation mechanism: when the sealing ring transmits vibration loads, the phenolic layer absorbs high-frequency impacts, and the PTFE layer attenuates low-frequency vibrations. The dual effect greatly reduces system vibration noise and achieves zero-wear operation under vibration conditions.

[0034] See Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 One end of the guide ring 2 is provided with an opening 202, which changes the shape of the guide ring 2. The single-end opening design of the guide ring breaks through the limitations of the traditional integral structure of the seal and simplifies the assembly process: the cylinder head can be installed simply by elastically expanding the opening of the guide ring, which greatly reduces the risk of assembly damage to precision parts. At the same time, the stress guiding topology optimization at its opening allows the load to be uniformly transmitted along the annular contour, avoiding local stress exceeding the limit, and ensuring that the guide ring maintains a constant locking force after multiple disassembly and assembly cycles.

[0035] See Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 A snap-fit ​​structure 203 is provided on the opposite side of the opening 202 to connect the guide ring 2. The snap-fit ​​structure forms a self-locking mechanism, which automatically locks the ring the moment it is installed. It generates a constant preload to compensate for manufacturing tolerances, eliminating the adjustment steps required by traditional structures. At the same time, it further improves the fixing effect of the sealing ring, making the sealing effect of the sealing ring even better.

[0036] See Figure 1 , Figure 3 , Figure 5The sealing ring 3 is made of rubber to prevent cylinder oil leakage. The elastic-plastic deformation capability of the rubber material establishes a dynamic adaptive sealing mechanism: under oil pressure fluctuations, the sealing ring compensates for system gaps in real time through controllable deformation, forming a leak-free contact pressure distribution. Its molecular chain entanglement structure gives it the ability to self-repair damage. When microcracks occur on the surface, the rubber molecules will reconstruct the cross-linked network under the effect of oil swelling, automatically filling the damaged area. At the same time, the high molecular viscoelasticity of the rubber generates a vibration energy conversion effect, converting destructive mechanical vibration into intramolecular frictional heat and dissipating it, eliminating the separation phenomenon of the sealing interface caused by vibration. The superelasticity of this material forms a double insurance mechanism under extreme working conditions: maintaining elasticity to prevent brittleness in low-temperature environments, and enhancing the oil film retention capability of the contact surface at high temperatures due to its viscous rheological properties.

[0037] See Figure 1 , Figure 2 , Figure 3 The cylinder head 1 is made of alloy steel and is used to seal both ends of the cylinder barrel, providing sealing, guidance, and connection interfaces. The alloy steel cylinder head achieves gradient functional material properties through a special heat treatment process: the surface hardened layer resists the fretting wear of the guide ring, while the core tempered structure has impact toughness, eliminating the risk of groove deformation from the root. Its integrated design constructs a triple sealing barrier system: the static sealing surface between the cylinder head and the cylinder barrel isolates external contaminants, the guide ring groove achieves precise positioning, and finally, the sealing ring completes the dynamic sealing. At the same time, the cylinder head integrates a rigid-flexible coupling structure: the alloy steel base ensures the rigidity requirements of the connection parts such as the mounting flange, and the groove transition area is topologically optimized to form a flexible area that actively absorbs the vibration energy of the system. This material performs better under corrosive conditions, and its chromium-nickel alloy composition forms a self-passivating protective film, which improves the service life of the sealing system in hydraulic oil containing moisture.

[0038] The implementation principle of this embodiment is as follows: a guide ring 2 is installed on the outer ring of the cylinder head 1. The guide ring 2 is opened through the opening 202 and installed. The snap-fit ​​structure 203 of the opening 202 is connected. The guide ring 2 is fixed by the pin 201 and the pin hole 102 inside the groove 101 of the cylinder head 1. After the two guide rings 2 are installed, a groove is formed. The sealing ring 3 is installed in the groove. The convex structure of the sealing ring 3 will be snapped into the groove formed by the guide ring 2 to fix the position of the sealing ring 3.

[0039] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A wear-resistant and durable hydraulic cylinder seal, characterized in that: The cylinder head (1) includes a cylinder cover. The cylinder cover (1) has grooves (101) at both the upper and lower ends of its outer ring. Each groove (101) has a guide ring (2) inside it. The outer ring of the guide ring (2) has a convex structure. A sealing ring (3) is provided between the two guide rings (2). The inner ring of the sealing ring (3) has a convex structure. The convex structure of the sealing ring (3) is engaged with the groove formed by the two guide rings (2).

2. The wear-resistant and durable hydraulic cylinder seal according to claim 1, characterized in that: The groove (101) has a number of pin holes (102) inside, and the upper part of the guide ring (2) has a number of pins (201) corresponding to the pin holes (102). The pin holes (102) and pins (201) are used to fix the position of the guide ring (2).

3. The wear-resistant and durable hydraulic cylinder seal according to claim 1, characterized in that: The guide ring (2) is used to protect the sealing ring (3).

4. The wear-resistant and durable hydraulic cylinder seal according to claim 1, characterized in that: One end of the guide ring (2) is provided with an opening (202), which changes the shape of the guide ring (2).

5. The wear-resistant and durable hydraulic cylinder seal according to claim 4, characterized in that: A snap-fit ​​structure (203) is provided on the opposite side of the opening (202) for connecting the guide ring (2).

6. The wear-resistant and durable hydraulic cylinder seal according to claim 1, characterized in that: The sealing ring (3) is made of rubber and is used to prevent the leakage of cylinder oil.

7. The wear-resistant and durable hydraulic cylinder seal according to claim 1, characterized in that: The cylinder head (1) is made of alloy steel and is used to seal both ends of the cylinder, provide sealing, guidance and connection interface.

Images