A seal assembly for a shock absorber

Abstract

The utility model relates to shock absorber technical field discloses a sealing assembly of shock absorber, including sealing jar, with piston rod that sealing jar swing joint, and piston rod one end in the linear motion of sealing jar, the other end extends sealing jar, be connected with the guide sleeve at the open mouth of sealing jar, the guide sleeve sleeve is established in the piston rod outside and with piston rod swing joint, the dustproof cover of inside top of guide sleeve is equipped with the seal, be equipped with the first sealing ring and second sealing ring that connect on the inner wall of guide sleeve in the below of dustproof cover, the first sealing ring and second sealing ring inside and piston rod outside form the resistance seal between, the utility model discloses through the oil return groove and oil discharge passage can in time with the oil liquid and pollutant that enter between two sealing rings discharge, prevent the oil and pressure accumulation, further promoted the reliability of sealing.

Description

Technical Field

[0001] This utility model relates to the field of shock absorber technology, specifically a sealing component for a shock absorber. Background Technology

[0002] Shock absorbers are common mechanical devices widely used in automobiles, motorcycles, industrial machinery, and other fields. Their main function is to provide smooth suspension and reduce the vibration of vehicles or equipment by controlling and absorbing vibrations and impacts during movement.

[0003] In the design of shock absorbers, oil seals are used to seal the gap between the cylinder and the piston to prevent liquid leakage. During use, the seal is usually achieved through two sealing lips, but a small amount of oil or contaminants may still enter the sealing lips. If they cannot be discharged in time, pressure will accumulate and affect the use. Utility Model Content

[0004] The purpose of this invention is to provide a sealing assembly for a shock absorber to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sealing assembly for a shock absorber, comprising a sealing cylinder, a piston rod movably connected to the sealing cylinder, one end of the piston rod moving linearly within the sealing cylinder, and the other end extending out of the sealing cylinder, a guide sleeve connected to the opening of the sealing cylinder, the guide sleeve being fitted over the outside of the piston rod and movably connected to the piston rod, a dust cover with a sealed top on the inner side of the guide sleeve, a first sealing ring and a second sealing ring sequentially connected to the inner wall of the guide sleeve below the dust cover, the inner sides of the first and second sealing rings forming a retaining seal with the outer side of the piston rod, an annular oil return groove between the first and second sealing rings on the guide sleeve, and an oil discharge channel communicating with the outside of the piston rod in the radial direction of the oil return groove.

[0006] Preferably, the oil drain channel is inclined with the inner end facing upward and the outer end facing downward.

[0007] Preferably, the oil drain channel includes a first channel communicating with the oil return groove and a second channel communicating with the outside of the sealing cylinder, wherein the first channel and the second channel are connected by an arc-shaped channel.

[0008] Preferably, the oil discharge channels are provided and are distributed symmetrically along the piston rod axis.

[0009] Preferably, the guide sleeve has a groove on its outer side, and an O-ring is provided in the groove. The guide sleeve forms a retaining seal with the inner wall of the sealing cylinder through the O-ring.

[0010] Preferably, the side of the first sealing ring that contacts the piston rod has continuous spiral lines.

[0011] Preferably, the first sealing ring has a metal ring embedded inside it.

[0012] Preferably, the first sealing ring and the second sealing ring have the same structure.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention can promptly discharge oil and contaminants that enter between the two sealing rings through the oil return groove and oil drain channel, preventing trapped oil and pressure buildup, and further improving the reliability of the seal. In addition, the oil drain channel is inclined, which facilitates the free discharge of oil, and the arc-shaped channel can form a barrier to prevent foreign objects from entering. Attached Figure Description

[0015] Figure 1 A three-dimensional structural schematic diagram of the sealing assembly of the shock absorber provided by this utility model;

[0016] Figure 2 A partial structural schematic diagram of the sealing assembly of the shock absorber provided by this utility model;

[0017] Figure 3 for Figure 2 A partially enlarged cross-sectional view of section A in the middle;

[0018] Figure 4 A partial cross-sectional view of the sealing assembly of the shock absorber provided by this utility model.

[0019] In the diagram: 1. Sealing cylinder; 2. Piston rod; 3. Guide sleeve; 4. Dust cover; 5. First sealing ring; 6. Second sealing ring; 7. Oil return groove; 8. Oil drain channel; 9. O-ring; 10. Metal ring; 11. First channel; 12. Arc-shaped channel; 13. Second channel; 14. Groove. Detailed Implementation

[0020] 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.

[0021] Please see Figures 1-4As shown, a sealing assembly for a shock absorber includes a sealing cylinder 1 and a piston rod 2 movably connected to the sealing cylinder 1. One end of the piston rod 2 moves linearly inside the sealing cylinder 1, while the other end extends out of the sealing cylinder 1. A guide sleeve 3 is connected to the opening of the sealing cylinder 1. The guide sleeve 3 is fitted onto the outside of the piston rod 2 and movably connected to the piston rod 2 to guide the piston rod 2 to move linearly. A dust cover 4 with a sealed top is provided on the inner side of the guide sleeve 3 to prevent dust from entering. Below the dust cover 4, a first sealing ring 5 and a second sealing ring 6 are sequentially connected to the inner wall of the guide sleeve 3. The inner sides of the first sealing ring 5 and the second sealing ring 6 form a resisting seal with the outer side of the piston rod 2, thereby forming two seals to improve the sealing effect. An annular oil return groove 7 is provided between the first sealing ring 5 and the second sealing ring 6 to concentrate the incoming oil and contaminants in the oil return groove 7. An oil discharge channel 8 communicating with the outside of the piston rod 2 is provided in the radial direction of the oil return groove 7 to discharge the oil and contaminants in the oil return groove 7.

[0022] The oil drain channel 8 is inclined with the inner end facing upward and the outer end facing downward, making the draining process smoother.

[0023] The oil drain channel 8 includes a first channel 11 that communicates with the oil return groove 7 and a second channel 13 that communicates with the outside of the sealing cylinder 1. The first channel 11 and the second channel 13 are connected by an arc-shaped channel 12, which forms a barrier to prevent foreign objects from entering.

[0024] There are two oil discharge channels 8, which are symmetrically distributed along the axis of piston rod 2 to make discharge more timely.

[0025] The guide sleeve 3 has a groove 14 on its outer side, and an O-ring 9 is provided in the groove 14. The guide sleeve 3 forms a retaining seal with the inner wall of the sealing cylinder 1 through the O-ring 9, thereby improving the sealing effect between the guide sleeve 3 and the sealing cylinder 1.

[0026] The side of the first sealing ring 5 that contacts the piston rod 2 has continuous spiral lines, forming a fluid dynamic backflow that actively sends any trace amount of oil that is about to leak back into the sealing cylinder 1.

[0027] The first sealing ring 5 has a metal ring 10 embedded inside to prevent the first sealing ring 5 from deforming or flipping.

[0028] It should be noted that the first sealing ring 5 and the second sealing ring 6 have the same structure.

[0029] Working principle: When the piston rod 2 moves outward, it will bring out a small amount of oil film. The spiral lines of the first sealing ring 5 and the second sealing ring 6 will scrape this part of the oil downward back into the sealing cylinder 1. At the same time, the piston rod 2 may bring in external contaminants, which are mostly blocked by the dust cover 4. A very small amount of intruding contaminants and possibly slightly seeping oil are collected in the return oil tank 7. The waste liquid in the return oil tank 7 is continuously and smoothly discharged from the outside of the sealing cylinder 1 through the inclined oil discharge channel 8 under the action of gravity and the movement of the piston rod 2. At the same time, the arc-shaped channel 12 prevents external contaminants from flowing back in.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] 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 sealing assembly for a shock absorber, comprising a sealing cylinder (1), a piston rod (2) movably connected to the sealing cylinder (1), wherein one end of the piston rod (2) moves linearly within the sealing cylinder (1), and the other end extends out of the sealing cylinder (1), a guide sleeve (3) is connected to the opening of the sealing cylinder (1), the guide sleeve (3) is sleeved on the outside of the piston rod (2) and movably connected to the piston rod (2), characterized in that, The guide sleeve (3) has a sealed dust cover (4) at the top of its inner side. Below the dust cover (4), a first sealing ring (5) and a second sealing ring (6) are connected to the inner wall of the guide sleeve (3) in sequence. The inner sides of the first sealing ring (5) and the second sealing ring (6) form a sealing seal with the outer side of the piston rod (2). The guide sleeve (3) has an annular oil return groove (7) between the first sealing ring (5) and the second sealing ring (6). The oil return groove (7) has an oil discharge channel (8) in the radial direction that communicates with the outside of the piston rod (2).

2. The sealing assembly of a shock absorber according to claim 1, characterized in that: The oil drain channel (8) is inclined with the inner end facing upward and the outer end facing downward.

3. The sealing assembly of a shock absorber according to claim 2, characterized in that: The oil drain channel (8) includes a first channel (11) that communicates with the return oil groove (7) and a second channel (13) that communicates with the outside of the sealing cylinder (1). The first channel (11) and the second channel (13) are connected by an arc-shaped channel (12).

4. The sealing assembly of a shock absorber according to claim 3, characterized in that: The oil discharge channel (8) is provided in two parts and is distributed symmetrically along the axis of the piston rod (2).

5. The sealing assembly of a shock absorber according to claim 1, characterized in that: The guide sleeve (3) has a groove (14) on its outer side, and an O-ring (9) is provided in the groove (14). The guide sleeve (3) forms a sealing seal with the inner wall of the sealing cylinder (1) through the O-ring (9).

6. The sealing assembly of a shock absorber according to claim 1, characterized in that: The side of the first sealing ring (5) that contacts the piston rod (2) has continuous spiral lines.

7. The sealing assembly of a shock absorber according to claim 6, characterized in that: The first sealing ring (5) has a metal ring (10) embedded inside.

8. The sealing assembly of a shock absorber according to claim 6, characterized in that: The first sealing ring (5) and the second sealing ring (6) have the same structure.

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