A multi-stage oil cylinder guide sleeve sealing structure

Abstract

The utility model discloses a kind of multistage oil cylinder guide sleeve sealing structure, including cylinder barrel, steel wire baffle, main body sealing ring, end cover, dust ring and piston rod;Cylinder barrel is cylindrical structure, is equipped with through-hole in center, steel wire baffle is equipped in through-hole;The cavity surrounded by steel wire baffle, cylinder barrel, end cover and piston rod is equipped with main body sealing ring, and the axial length of cavity is greater than the axial length of main body sealing ring;Main body sealing ring is located in the bore of cylinder barrel, end cover is threadedly connected with cylinder barrel, for exerting axial precompression to main body sealing ring.The utility model cancels the original guide sleeve, and simplifies support ring, main seal and static seal into integrated structure, is directly installed in the bore of cylinder barrel, and end cover is used to fix and pre-compress main body sealing member, so that the bore of cylinder barrel only needs to arrange a steel wire baffle groove, greatly reduces processing difficulty, and can well guarantee coaxiality.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder manufacturing technology, and in particular to a multi-stage cylinder guide sleeve sealing structure. Background Technology

[0002] Hydraulic cylinders are actuators in hydraulic transmission systems, converting hydraulic energy into mechanical energy. They achieve reciprocating motion and are widely used in various mechanical equipment. Existing conventional hydraulic cylinder guide sleeve sealing structures typically consist of an inner tangential support ring, a main seal, a dustproof groove, etc., with a static sealing groove on the outer circumference. While this structure is generally sufficient, it becomes difficult to implement when the cylinder wall thickness is thin or the difference between the cylinder diameter and rod diameter is small, and it is also challenging to manufacture. This invention solves these problems through a novel sealing structure. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a novel multi-stage hydraulic cylinder guide sleeve sealing structure to solve problems that conventional hydraulic cylinders cannot meet.

[0004] To solve the above-mentioned technical problems, the present invention provides a multi-stage hydraulic cylinder guide sleeve sealing structure, characterized in that it includes:

[0005] Cylinder barrel, wire retaining ring, main body sealing ring, end cap, dust seal, and piston rod;

[0006] The cylinder is a cylindrical structure with a through hole in the center and a steel wire retaining ring inside the through hole;

[0007] The cavity formed by the wire retaining ring, cylinder, end cover and piston rod is provided with a main sealing ring, and the axial length of the cavity is greater than the axial length of the main sealing ring;

[0008] The main sealing ring is disposed in the inner hole of the cylinder, and the end cap is threadedly connected to the cylinder to apply axial preload to the main sealing ring.

[0009] Optionally, the cross-section of the wire retaining ring is circular, and the material is 65Mn.

[0010] Optionally, the main sealing ring includes support portions at both ends and a sealing portion in the middle, wherein the cross-section of the support portion is rectangular and the material is PA.

[0011] Optionally, the sealing part is composed of multiple sealing elements, which include rubber material and fabric fiber material.

[0012] Optionally, the end cap has a cylindrical structure with an internal thread in its inner hole and a dustproof ring mounting groove on its end face.

[0013] Optionally, the dustproof ring is installed in the dustproof ring mounting groove.

[0014] Optionally, the main sealing ring is axially pressed and fixed inside the cylinder by the end cover, which is used to adjust the preload gap to compensate for the axial wear of the sealing ring.

[0015] Optionally, only one wire retaining ring mounting groove is provided in the inner bore of the cylinder.

[0016] Optionally, the total length of the cavity is greater than the axial length of the main sealing ring to form an installation gap.

[0017] Optionally, the structure is suitable for hydraulic cylinders with small cylinder wall thickness or a small difference between the cylinder diameter and the piston rod diameter.

[0018] The beneficial effects of this utility model's technical solution are:

[0019] This invention employs a special sealing structure. This seal eliminates the original guide sleeve, simplifying the support ring, main seal, and static seal into a single integrated structure, which is directly installed inside the cylinder bore. The end cap is used to fix and pre-compress the main seal. This way, only one wire retaining ring groove needs to be arranged in the cylinder bore, greatly reducing the processing difficulty and ensuring good coaxiality. Furthermore, if the seal shows signs of wear after a period of use, the tightness of the end cap can be adjusted to increase the compression of the seal and extend its service life. Attached Figure Description

[0020] Figure 1 This is a front view of the guide sleeve sealing structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the main sealing ring of this utility model.

[0022] Figure 3 This is the front view of the wire retaining ring of this utility model. Detailed implementation method:

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] Please see Figure 1 , Figure 2 and Figure 3The diagram illustrates a multi-stage hydraulic cylinder guide sleeve sealing structure according to an embodiment. It is characterized by comprising: a cylinder barrel, a wire retaining ring, a main sealing ring, an end cap, a dustproof ring, and a piston rod. The cylinder barrel is a cylindrical structure with a through hole at its center, within which the wire retaining ring is disposed. The main sealing ring is disposed within a cavity formed by the wire retaining ring, the cylinder barrel, the end cap, and the piston rod, the axial length of which is greater than the axial length of the main sealing ring. The main sealing ring is located within the inner bore of the cylinder barrel, and the end cap is threadedly connected to the cylinder barrel to apply axial preload to the main sealing ring.

[0029] In this embodiment, the cross-section of the wire retaining ring is circular, and the material is 65Mn.

[0030] In this embodiment, the main sealing ring includes support portions at both ends and a sealing portion in the middle. The support portions have a rectangular cross-section and are made of PA material. The sealing portion is composed of multiple sealing elements, which include rubber material and fabric-reinforced fiber material.

[0031] In this embodiment, the end cap has a cylindrical structure with an internal thread in its inner hole and a dustproof ring mounting groove on its end face. The dustproof ring is installed in the dustproof ring mounting groove.

[0032] In this embodiment, the main sealing ring is axially pressed and fixed inside the cylinder by the end cap. The end cap is used to adjust the preload clearance to compensate for axial wear of the sealing ring. Only one wire retaining ring mounting groove is provided in the inner bore of the cylinder.

[0033] In this embodiment, the total length of the cavity is greater than the axial length of the main sealing ring to form an installation gap. This structure is suitable for hydraulic cylinders with thin cylinder walls or where the difference between the cylinder diameter and the piston rod diameter is small.

[0034] The following description will further illustrate the characteristics and functions of this utility model.

[0035] This embodiment of a multi-stage hydraulic cylinder guide sleeve sealing structure includes a cylinder barrel 1, a wire retaining ring 2, a main sealing ring 3, an end cap 4, a dustproof ring 5, and a piston rod 6.

[0036] The cylinder 1 is cylindrical with a through hole in the center, and a wire retaining ring 2 is arranged inside the through hole. The main sealing ring 3 is arranged in the cavity AA surrounded by the cylinder 1, the wire retaining ring 2, the end cover 4 and the piston rod 6. The total length of the cavity enclosed by the above structure is greater than the length of the seal to ensure that after the seal is installed, the inner end face of the end cover 4 and the right end face of the cylinder 1 cannot contact each other. A certain gap needs to be maintained to facilitate the pre-compression of the seal. At the same time, the seal can be radially pressed after wear.

[0037] The principle of this utility model is as follows: by simplifying the support ring, main seal and static seal into an integrated structure, it is directly installed in the inner hole of the cylinder. The end cap is used to fix and pre-compress the main sealing component. In this way, only one wire retaining ring groove needs to be arranged in the inner hole of the cylinder, which greatly reduces the processing difficulty and ensures coaxiality. At the same time, if the sealing component wears out after a period of use, the tightness of the end cap can be adjusted to increase the compression of the sealing component and extend its service life.

[0038] In summary, this utility model employs a special sealing structure. This seal eliminates the original guide sleeve, simplifying the support ring, main seal, and static seal into a single integrated structure, which is directly installed inside the cylinder bore. The end cap is used to fix and pre-compress the main seal. This way, only one wire retaining ring groove needs to be arranged in the cylinder bore, greatly reducing the processing difficulty and ensuring good coaxiality. Furthermore, if the seal shows signs of wear after a period of use, the tightness of the end cap can be adjusted to increase the compression of the seal and extend its service life.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage hydraulic cylinder guide sleeve sealing structure, characterized in that, include: Cylinder (1), wire retaining ring (2), main body sealing ring (3), end cap (4), dustproof ring (5) and piston rod (6); The cylinder (1) is a cylindrical structure with a through hole in the center and a steel wire retaining ring (2) inside the through hole. The cavity formed by the wire retaining ring (2), cylinder (1), end cap (4) and piston rod (6) is provided with a main sealing ring (3), and the axial length of the cavity is greater than the axial length of the main sealing ring (3). The main sealing ring (3) is located in the inner hole of the cylinder (1), and the end cap (4) is threadedly connected to the cylinder (1) to apply axial preload to the main sealing ring (3).

2. The multi-stage hydraulic cylinder guide sleeve sealing structure according to claim 1, characterized in that: The cross-section of the steel wire retaining ring (2) is circular, and the material is 65Mn.

3. The multi-stage hydraulic cylinder guide sleeve sealing structure according to claim 1, characterized in that: The main sealing ring (3) includes support parts at both ends and a sealing part in the middle. The cross-section of the support part is rectangular and the material is PA.

4. The multi-stage hydraulic cylinder guide sleeve sealing structure according to claim 3, characterized in that: The sealing part is composed of multiple sealing elements, which include rubber material and fabric fiber material.

5. The multi-stage hydraulic cylinder guide sleeve sealing structure according to claim 1, characterized in that: The end cap (4) is a cylindrical structure with an internal thread in its inner hole and a dustproof ring mounting groove on its end face.

6. The multi-stage hydraulic cylinder guide sleeve sealing structure according to claim 5, characterized in that: The dustproof ring (5) is installed in the dustproof ring mounting groove.

7. The multi-stage hydraulic cylinder guide sleeve sealing structure according to claim 1, characterized in that: The main sealing ring (3) is fixed inside the cylinder (1) by axial pressing of the end cover (4). The end cover (4) is used to adjust the pre-pressure gap to compensate for the axial wear of the sealing ring.

8. The multi-stage hydraulic cylinder guide sleeve sealing structure according to claim 1, characterized in that: The cylinder (1) has only one wire retaining ring mounting groove in its inner hole.

9. The multi-stage hydraulic cylinder guide sleeve sealing structure according to any one of claims 1 to 8, characterized in that: The total length of the cavity is greater than the axial length of the main sealing ring (3) to form an installation gap.

Images