Sealing structure of nitrogen shock absorber

Abstract

The utility model is applicable to the technical field of nitrogen shock absorbers, and provides a sealing structure of a nitrogen shock absorber, which comprises a guide oil seal seat, a piston rod mounted in the guide oil seal seat, shock absorber special oil stored in the guide oil seal seat, and an oil film formed on the piston rod by the shock absorber special oil. A step seal and a Y-shaped rubber oil seal are sequentially arranged between the guide oil seal seat and the piston rod from inside to outside, and oil special for the shock absorber is squeezed into the step seal to form a first oil seal; when the step seal is subjected to unilateral abrasion or damage, oil flows to the Y-shaped rubber oil seal, and the Y-shaped rubber oil seal is tightly attached to the piston rod to form a second oil seal; according to the sealing structure, a double-channel sealing mode is adopted, and the step seal and the Y-shaped rubber oil seal are combined for use, so that the service life of a part of the nitrogen shock absorber subjected to large lateral force is effectively prolonged, meanwhile, the abrasion of the oil seal structure is reduced, the influence of high-frequency high-pressure temperature on the sealing of the oil seal is avoided, and the performance requirements of customers on products are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of nitrogen shock absorbers, and in particular relates to a sealing structure of a nitrogen shock absorber. Background Art

[0002] Nitrogen shock absorbers are structures that alleviate the vibrations generated when the vehicle body and frame accelerate and improve driving comfort. With the rise of electric off-road vehicles, the requirements for damping force values ​​are getting higher and higher, and thus the performance requirements for oil seals are also getting higher and higher.

[0003] Under extreme pressure, the conventional combined oil seal (single-channel) increases its grip on the piston rod, which accelerates the friction of the oil seal and cannot meet the durability requirements of the product. At the same time, the conventional oil seal structure wears quickly, and the high frequency, high pressure and high temperature have a great impact on the oil seal. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a sealing structure of a nitrogen shock absorber, aiming to solve the problems existing in the above-mentioned background technology.

[0005] The utility model is implemented in this way: a sealing structure of a nitrogen shock absorber includes a guide oil seal seat, characterized in that it also includes:

[0006] A piston rod, wherein the piston rod is installed in a guide oil seal seat;

[0007] Special oil for shock absorber, the special oil for shock absorber is stored in the guide oil seal seat to form a high-pressure sealing chamber, and the special oil for shock absorber forms an oil film on the piston rod to make the reciprocating motion of the oil seal smoother;

[0008] Among them, a step seal and a Y-shaped rubber oil seal are arranged in sequence from the inside to the outside between the guide oil seal seat and the piston rod, and the shock absorber special oil is squeezed into the step seal to form a first oil seal;

[0009] When the step seal is worn or damaged on one side, the step seal has a certain pressure relief effect on the oil, and the oil flows to the Y-type rubber oil seal, and the Y-type rubber oil seal is tightly attached to the piston rod to form a second oil seal.

[0010] Preferably, the step seal and the guide oil seal seat, and the Y-shaped rubber oil seal and the guide oil seal seat are connected by means of interference fit in a slot.

[0011] Preferably, a DU bushing is further installed between the guide oil seal seat and the piston rod, and the DU bushing is located on the inner side of the step seal and is in contact with the special oil for the shock absorber.

[0012] The sealing structure of a nitrogen shock absorber provided by an embodiment of the utility model adopts a double-pass sealing method and combines a step seal and a Y-type rubber oil seal to effectively extend the service life of some nitrogen shock absorbers that are subject to large lateral forces, while reducing the wear of the oil seal structure and avoiding the influence of high frequency, high pressure and excessive temperature on the oil seal, thereby meeting customers' performance requirements for the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A structural schematic diagram of a sealing structure of a nitrogen shock absorber provided in an embodiment of the utility model;

[0014] In the attached figure: 1-special oil for shock absorber; 2-guide oil seal seat; 3-DU bushing; 4-step seal; 5-Y-type rubber oil seal; 6-piston rod. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0016] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0017] like Figure 1 As shown, it is a structural diagram of a sealing structure of a nitrogen shock absorber provided by an embodiment of the utility model, comprising a guide oil seal seat 2, a piston rod 6 and a shock absorber special oil 1, wherein the piston rod 6 is installed in the guide oil seal seat 2; the shock absorber special oil 1 is stored in the guide oil seal seat 2 to form a high-pressure sealing chamber, and the shock absorber special oil 1 forms an oil film on the piston rod 6, so that the reciprocating motion of the oil seal is smoother; wherein, a step seal 4 and a Y-type rubber oil seal 5 are arranged in sequence from the inside to the outside between the guide oil seal seat 2 and the piston rod 6, and the shock absorber special oil 1 is squeezed into the step seal 4 to form a first oil seal; when the step seal 4 is subjected to unilateral wear or damage, the step seal 4 has a certain pressure relief effect on the oil, and the oil flows to the Y-type rubber oil seal 5, and the Y-type rubber oil seal 5 is close to the piston rod 6 to form a second oil seal.

[0018] The sealing structure of a nitrogen shock absorber provided in the present application adopts a double-pass sealing method, and combines a step seal 4 and a Y-type rubber oil seal 5 for use, thereby effectively extending the service life of some nitrogen shock absorbers that are subject to large lateral forces, while reducing the wear of the oil seal structure, and avoiding the influence of high frequency, high pressure and excessive temperature on the oil seal, thereby meeting customers' performance requirements for the product.

[0019] In one example of the utility model, a DU bushing 3 is also installed between the guide oil seal seat 2 and the piston rod 6. The DU bushing 3 is located on the inner side of the step seal 4 and is in contact with the shock absorber special oil 1. The DU bushing 3 is made of copper alloy, aluminum alloy, steel, etc. By arranging the DU bushing 3, friction can be reduced, the piston rod 6 can be protected and the working efficiency of the shock absorber can be improved.

[0020] like Figure 1 As shown, as a preferred embodiment of the utility model, the step seal 4 and the guide oil seal seat 2, the Y-shaped rubber oil seal 5 and the guide oil seal seat 2 are connected by means of interference fit through a slot.

[0021] In an example of the utility model, by adopting the slot interference fit method, the nitrogen shock absorber can have the advantages of simple structure, good centering, large load-bearing capacity and good impact resistance.

[0022] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0023] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sealing structure of a nitrogen shock absorber, comprising a guide oil seal seat, characterized in that: Also includes: A piston rod, wherein the piston rod is installed in a guide oil seal seat; Special oil for shock absorber, the special oil for shock absorber is stored in the guide oil seal seat to form a high-pressure sealing chamber, and the special oil for shock absorber forms an oil film on the piston rod to make the reciprocating motion of the oil seal smoother; Among them, a step seal and a Y-shaped rubber oil seal are arranged in sequence from the inside to the outside between the guide oil seal seat and the piston rod, and the shock absorber special oil is squeezed into the step seal to form a first oil seal; When the step seal is worn or damaged on one side, the step seal has a certain pressure relief effect on the oil, and the oil flows to the Y-type rubber oil seal, and the Y-type rubber oil seal is tightly attached to the piston rod to form a second oil seal.

2. The sealing structure of a nitrogen shock absorber according to claim 1, characterized in that: The step seal and the guide oil seal seat, the Y-shaped rubber oil seal and the guide oil seal seat are all connected by means of interference fit in the slot.

3. The sealing structure of a nitrogen shock absorber according to claim 1, characterized in that: A DU bushing is also installed between the guide oil seal seat and the piston rod. The DU bushing is located on the inner side of the step seal and is in contact with the special oil for the shock absorber.

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