Suspension oil cylinder sealing structure

Abstract

The utility model provides a suspension oil cylinder sealing structure which comprises a guide sleeve, a sealing ring for a shaft, a buffering ring and a piston rod, the piston rod is partially inserted into the guide sleeve and is in sliding connection with the guide sleeve, and the sealing ring for the shaft and the buffering ring are sequentially arranged in the axial direction of the piston rod. The sealing ring for the shaft comprises a main body for the shaft and a first check ring, the main body for the shaft extends towards one side close to the buffer ring to form a first Y-shaped lip, and the first check ring is embedded in an inner ring of the main body for the shaft and located on the end face, away from the buffer ring, of the main body for the shaft. The service life of the suspension oil cylinder sealing structure can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of suspension cylinder sealing technology, and in particular to a suspension cylinder sealing structure. Background Technology

[0002] The suspension cylinder is a critical component of mining trucks, suspended between the main frame assembly and the front axle, playing a role in supporting the frame and absorbing shocks during vehicle operation. Problems with the suspension cylinder can range from minor issues like disassembly and return to the factory, resulting in high repair costs, to more serious consequences like vehicle damage and loss of life, making its reliability a growing concern for truck owners. In particular, during operation, the suspension cylinder operates on uneven terrain and bears the heavy load of the vehicle, causing continuous up-and-down vibrations. This forces the suspension cylinder to withstand strong impacts and rapid reciprocating motion, generating significant frictional heat. Because conditions for reducing the oil temperature within the cylinder are extremely poor, the oil temperature continuously rises. This necessitates a sealing structure with extremely high temperature and pressure resistance. However, existing suspension cylinder sealing structures use conventional sealing rings, which have poor high-temperature and high-pressure resistance and short service life. Therefore, improvements to the suspension cylinder sealing structure are needed to extend its service life. Utility Model Content

[0003] The purpose of this invention is to provide a suspension cylinder sealing structure to solve the problem of short service life of existing suspension cylinder sealing structures.

[0004] To solve the above-mentioned technical problems, this utility model provides a suspension cylinder sealing structure, including a guide sleeve, a shaft sealing ring, a buffer ring, and a piston rod partially inserted into the guide sleeve and slidably connected to the guide sleeve. The shaft sealing ring and the buffer ring are arranged sequentially along the axial direction of the piston rod. The shaft sealing ring includes a shaft body and a first retaining ring. The shaft body extends towards the side close to the buffer ring and has a first Y-shaped lip. The first retaining ring is embedded in the inner ring of the shaft body and is located at the end face of the shaft body away from the buffer ring.

[0005] Optionally, the inner ring of the shaft body extends inward with a closed-loop secondary lip that has a wavy inner ring.

[0006] Optionally, the buffer ring includes an elastomer and a slip ring, with the elastomer sleeved on the outer ring of the slip ring.

[0007] Optionally, the outer ring of the slip ring and the inner ring of the elastic body have a specific gap on the side near the shaft seal, and the specific gap gradually increases from the side away from the shaft seal to the side near the shaft seal.

[0008] Optionally, a dust seal is also included between the guide sleeve and the piston rod, the dust seal being disposed on the side of the shaft seal away from the buffer ring.

[0009] Optionally, the dustproof ring includes a dustproof body, the dustproof body extending towards the side near the shaft seal ring with a second Y-shaped lip, the dustproof body extending away from the shaft seal ring with an outer lip, and the outer lip also extending towards the axis of the piston rod, and an auxiliary lip extending away from the shaft seal ring at the corner where the dustproof body and the outer lip intersect, the auxiliary lip also extending away from the axis of the piston rod.

[0010] Optionally, the suspension cylinder sealing structure further includes a support guide ring disposed between the guide sleeve and the piston rod, the support guide ring being disposed on the side of the shaft seal ring near the buffer ring.

[0011] Optionally, it also includes a cylinder body and a first static seal ring, wherein the guide sleeve is installed in the cylinder body and the first static seal ring is disposed between the cylinder body and the guide sleeve.

[0012] Optionally, the inner and outer rings of the first static sealing ring protrude outwards.

[0013] Optionally, the suspension cylinder sealing structure further includes a support guide ring disposed between the guide sleeve and the piston rod, the support guide ring being disposed on the side of the shaft seal ring near the buffer ring.

[0014] The suspended hydraulic cylinder sealing structure provided by this utility model has the following beneficial effects:

[0015] First, the cooperation between the shaft seal ring and the buffer ring improves the reliability of the seal under continuous high temperature and high impact conditions. Since the first retaining ring is embedded in the inner ring of the shaft body and located at the end face of the shaft body away from the buffer ring, the first retaining ring enhances the high pressure bearing capacity of the shaft seal ring. The first Y-shaped lip of the shaft body has extremely strong resilience, ensuring the continuity of the sealing effect, thereby improving the service life of the suspension cylinder sealing structure.

[0016] Secondly, the use of special high and low temperature resistant materials in the suspension cylinder sealing structure of this application can improve the service life of the suspension cylinder sealing structure. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the suspension cylinder sealing structure in an embodiment of this utility model;

[0018] Figure 2This is a schematic diagram of the shaft sealing ring of the suspension cylinder sealing structure in this utility model embodiment;

[0019] Figure 3 This is a schematic diagram of the buffer ring structure of the suspension cylinder sealing structure in this embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the dustproof ring of the suspension cylinder sealing structure in this utility model embodiment;

[0021] Figure 5 This is a schematic diagram of the structure of the first static sealing ring of the suspension cylinder sealing structure in this embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100-Guide sleeve; 200-Piston rod; 300-Shaft seal ring; 310-Shaft body; 320-First Y-shaped lip; 330-First retaining ring; 400-Buffer ring; 410-Elastomer; 420-Slip ring; 500-Dustproof ring; 510-Dustproof body; 520-Second Y-shaped lip; 530-Outer lip; 540-Auxiliary lip;

[0024] 600 - Support guide ring;

[0025] 700 - Cylinder block; 810 - First static seal ring; 820 - Second static seal ring. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 1 This is a cross-sectional schematic diagram of the suspension cylinder sealing structure in an embodiment of this utility model. Figure 2 This is a schematic diagram of the shaft sealing ring 300 of the suspension cylinder sealing structure in this embodiment of the present invention. Figure 3 This is a schematic diagram of the buffer ring 400 of the suspension cylinder sealing structure in this embodiment of the present invention. Figure 4 This is a schematic diagram of the dustproof ring 500 of the suspension cylinder sealing structure in this embodiment of the present invention. Figure 5This is a schematic diagram of the structure of the first static sealing ring of the suspension cylinder sealing structure in this embodiment of the present invention. This embodiment provides a suspension cylinder sealing structure, including a guide sleeve 100, a shaft sealing ring 300, a buffer ring 400, and a piston rod 200 partially inserted into the guide sleeve and slidably connected to the guide sleeve. The shaft sealing ring 300 and the buffer ring 400 are arranged sequentially along the axial direction of the piston rod 200. The shaft sealing ring 300 includes a shaft body 310 and a first retaining ring 330. The shaft body 310 extends a first Y-shaped lip 320 towards the side close to the buffer ring 400. The first retaining ring 330 is embedded in the inner ring of the shaft body 310 and is located at the end face of the shaft body 310 away from the buffer ring 400.

[0033] Due to the cooperation between the shaft seal ring 300 and the buffer ring 400, the reliability of the seal can be improved under continuous high temperature and high impact conditions. Since the first retaining ring 330 is embedded in the inner ring of the shaft body 310 and located at the end face of the shaft body 310 away from the buffer ring 400, the first retaining ring 330 can improve the high pressure bearing capacity of the shaft seal ring 300. The first Y-shaped lip 320 of the shaft body 310 has extremely strong resilience, ensuring the continuity of the sealing effect, thereby improving the service life of the suspension cylinder sealing structure.

[0034] Preferably, the shaft body 310 is made of HNBR (hydrogenated nitrile butadiene), using imported modified hydrogenated nitrile butadiene, which has excellent low-temperature and high-temperature resistance and extremely strong lip resilience, ensuring the continuity of the sealing effect.

[0035] Preferably, the first retaining ring 330 is made of PTFE with added fine copper powder, pressed, sintered and then machined, which can improve the high pressure bearing capacity of the shaft seal ring 300.

[0036] The inner ring of the shaft body 310 extends inward with a closed-loop secondary lip that has a wavy inner ring, which can further improve the sealing performance of the shaft seal ring 300.

[0037] The buffer ring 400 includes an elastomer 410 and a slip ring 420, with the elastomer 410 sleeved on the outer ring of the slip ring 420.

[0038] The slip ring 420 is made of polytetrafluoroethylene as the base material, with added fine copper powder to enhance its anti-extrusion ability, improve its oil film scraping effect, reduce residual oil film, and provide excellent sealing performance.

[0039] The inner ring of the outer ring elastomer 410 of the slip ring 420 has a specific gap on the side near the shaft seal ring 300, and the specific gap gradually increases from the side away from the shaft seal ring 300 to the side near the shaft seal ring 300.

[0040] The elastomer 410 is made of HNBR (hydrogenated nitrile butadiene).

[0041] It has a function to reduce back pressure to a certain extent, which can prevent damage to the shaft seal ring 300 caused by excessive back pressure.

[0042] The suspension cylinder sealing structure also includes a dustproof ring 500 disposed between the guide sleeve 100 and the piston rod 200, wherein the dustproof ring 500 is disposed on the side of the shaft seal ring 300 away from the buffer ring 400.

[0043] The dustproof ring 500 includes a dustproof body 510. The dustproof body 510 has a second Y-shaped lip 520 extending towards the side close to the shaft seal ring 300. The dustproof body 510 also has an outer lip 530 extending away from the shaft seal ring 300, and the outer lip 530 extends towards the axis of the piston rod. At the corner where the dustproof body 510 and the outer lip 530 intersect, an auxiliary lip 540 extends away from the shaft seal ring 300, and the auxiliary lip 540 extends away from the axis of the piston rod 200. This provides the dustproof seal ring with bidirectional, multi-layered sealing functionality. The V-shaped structure formed by the inner lip of the first Y-shaped lip 320 and the outer lip 530 of the dustproof ring 500 provides secondary dustproof functionality. In dusty construction sites, the dustproof effect is enhanced, preventing fine dust from entering the cavity and affecting the sealing performance of the seal, thus preventing oil leakage. The outer lip 530 and auxiliary lip 540, which are waterproof and mud-proof, prevent dirt from entering the cylinder 700, making it suitable for safe use in harsh, all-weather outdoor environments. The dust seal 500 allows a very thin oil film to remain on the surface of the piston rod 200 as it returns, preventing oil film accumulation outside the cavity.

[0044] The dustproof ring 500 is made of HNBR (hydrogenated nitrile butadiene).

[0045] The suspension cylinder sealing structure also includes a support guide ring 600 disposed between the guide sleeve 100 and the piston rod 200. The support guide ring 600 is located on the side of the shaft seal ring 300 near the buffer ring 400. By providing the support guide ring 600, the sealing structure of the suspension cylinder can have high compressive strength, excellent wear resistance, good temperature resistance, and the ability to withstand strong vibrations and large impact loads. Furthermore, the support guide ring 600 has a low coefficient of friction, allowing it to operate with minimal or no lubrication, making it suitable for industrial conditions with high load-bearing capacity and extremely frequent reciprocating motion.

[0046] Preferably, there are two support guide rings 600, which are respectively arranged on both sides of the buffer ring. In this way, the stability of the suspension cylinder sealing structure can be further improved due to the extended support distance.

[0047] The support guide ring 600 is made of high-strength phenolic resin GXSZ-1. This support guide ring 600 is made of high-quality wear-resistant fiber fabric, with added solid lubricant (molybdenum disulfide) and a specially formulated soluble resin.

[0048] The suspension cylinder sealing structure also includes a cylinder body 700 and a first static sealing ring 810. The guide sleeve 100 is installed inside the cylinder body 700, and the first static sealing ring 810 is disposed between the cylinder body 700 and the guide sleeve 100.

[0049] Specifically, the inner and outer rings of the first static seal ring 810 protrude outwards, thus giving the first static seal ring 810 a drum shape. Due to the continuous high-pressure pulse impact on the suspension cylinder, the comprehensive physical properties of the first static seal ring 810 are 4-5 times higher than those of NBR O-rings, its resilience is more than 3 times that of NBR, it has strong extrusion resistance, good resilience, and excellent wear resistance, and it has a bidirectional sealing function. It is suitable for rapid pressure changes, easy to install, and avoids cutting and damage during assembly.

[0050] The first static sealing ring 810 is made of polycaprolactone (PCL).

[0051] The first static sealing ring 810 is located at the corresponding position on the outer ring of the support guide ring 600.

[0052] The suspension cylinder sealing structure further includes a second static sealing ring 820, which is disposed between the cylinder body 700 and the guide sleeve 100. The second static sealing ring 820 is closer to the inner side of the cylinder body 700 than the first static sealing ring 810. This further improves the sealing performance of the suspension cylinder sealing structure.

[0053] The second static sealing ring 820 includes a second retaining ring and an O-ring. The second retaining ring and the O-ring are sequentially sleeved on the guide sleeve 100 from the outer side to the inner side of the cylinder body 700, and the radial end faces of the second retaining ring and the O-ring are in contact.

[0054] Preferably, the second retaining ring is made of polytetrafluoroethylene (PTEE), and the O-ring is made of nitrile rubber (NBR).

[0055] The second static sealing ring 820 is positioned above the support guide ring 600 near the inner side of the cylinder body 700.

[0056] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A sealing structure for a suspension cylinder, comprising a guide sleeve, a shaft seal ring, a buffer ring, and a piston rod partially inserted into and slidably connected to the guide sleeve, wherein the shaft seal ring and the buffer ring are arranged sequentially along the axial direction of the piston rod, characterized in that, The shaft sealing ring includes a shaft body and a first retaining ring. The shaft body extends towards the side near the buffer ring and has a first Y-shaped lip. The first retaining ring is embedded in the inner ring of the shaft body and is located at the end face of the shaft body away from the buffer ring.

2. The suspension cylinder sealing structure as described in claim 1, characterized in that, The inner ring of the shaft body extends inward with a closed-loop secondary lip that has a wavy inner ring.

3. The suspension cylinder sealing structure as described in claim 1, characterized in that, The buffer ring includes an elastomer and a slip ring, with the elastomer sleeved on the outer ring of the slip ring.

4. The suspension cylinder sealing structure as described in claim 3, characterized in that, The outer ring of the slip ring and the inner ring of the elastic body have a specific gap on the side near the shaft seal, and the specific gap gradually increases from the side away from the shaft seal to the side near the shaft seal.

5. The suspension cylinder sealing structure as described in claim 1, characterized in that, It also includes a dust seal disposed between the guide sleeve and the piston rod, the dust seal being disposed on the side of the shaft seal away from the buffer ring.

6. The suspension cylinder sealing structure as described in claim 5, characterized in that, The dustproof ring includes a dustproof body, a second Y-shaped lip extending from the side closer to the shaft seal ring, an outer lip extending from the side away from the shaft seal ring, and the outer lip also extending towards the axis of the piston rod. At the corner where the dustproof body and the outer lip intersect, an auxiliary lip extends from the side away from the shaft seal ring, and the auxiliary lip also extends away from the axis of the piston rod.

7. The suspension cylinder sealing structure as described in claim 1, characterized in that, The suspension cylinder sealing structure also includes a support guide ring disposed between the guide sleeve and the piston rod, the support guide ring being disposed on the side of the shaft seal ring near the buffer ring.

8. The suspension cylinder sealing structure as described in claim 1, characterized in that, It also includes a cylinder body and a first static seal ring, with the guide sleeve installed inside the cylinder body and the first static seal ring disposed between the cylinder body and the guide sleeve.

9. The suspension cylinder sealing structure as described in claim 8, characterized in that, The inner and outer rings of the first static sealing ring protrude outwards.

10. The suspension cylinder sealing structure as described in claim 8, characterized in that, The suspension cylinder sealing structure further includes a support guide ring disposed between the guide sleeve and the piston rod. The support guide ring is disposed on the side of the shaft seal ring near the buffer ring, and the first static seal ring is located at the corresponding position on the outer ring of the support guide ring.

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