CN221033437U - Round oil cylinder with bushing sealing structure - Google Patents
Round oil cylinder with bushing sealing structure Download PDFInfo
- Publication number
- CN221033437U CN221033437U CN202323180534.0U CN202323180534U CN221033437U CN 221033437 U CN221033437 U CN 221033437U CN 202323180534 U CN202323180534 U CN 202323180534U CN 221033437 U CN221033437 U CN 221033437U
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- China
- Prior art keywords
- bushing
- sealing
- wall
- piston rod
- limiting
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- 238000007789 sealing Methods 0.000 title claims abstract description 55
- 239000002184 metal Substances 0.000 claims description 8
- 239000003921 oil Substances 0.000 description 16
- 239000010720 hydraulic oil Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
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Abstract
The utility model discloses a circular oil cylinder with a bushing sealing structure, which comprises a piston rod, a front cover, a cylinder barrel and a sealing bushing, wherein the piston rod, the front cover, the cylinder barrel and the sealing bushing are coaxial; the external thread of the front cover is in threaded fit with the internal thread at the front end of the cylinder barrel; the sealing bushing comprises a bushing front section and a bushing rear section, the bushing rear section is in sealing fit between the outer wall of the piston rod and the inner wall of the cylinder barrel, the bushing front section is clamped between the outer wall of the piston rod and the inner ring of the front cover, and a circle of expansion cavity is formed in the bushing front section; can inhibit oil leakage.
Description
Technical Field
The utility model belongs to the field of hydraulic cylinders.
Background
When the piston rod of the hydraulic piston device is connected with the driven structure, the piston rod and the cylinder barrel have a tiny eccentric amount due to assembly errors, so that the risk of oil leakage at the front cover of the oil cylinder exists; meanwhile, in the process of using the hydraulic oil cylinder, when the load is suddenly excessive, the hydraulic pressure in the cylinder barrel easily exceeds the rated pressure, and when the hydraulic pressure in the cylinder barrel exceeds the normal value, the oil leakage phenomenon occurs at the position between the piston rod and the front cover inner ring of the oil cylinder, so that a structure with the oil leakage inhibiting capability is required to be designed when the hydraulic pressure in the oil cylinder is excessive.
Disclosure of Invention
The utility model aims to: in order to overcome the defects in the prior art, the utility model provides the circular oil cylinder with the bushing sealing structure, which can inhibit oil leakage under an overpressure state.
The technical scheme is as follows: in order to achieve the above purpose, the circular cylinder with the bushing sealing structure comprises a piston rod, a front cover, a cylinder barrel and a sealing bushing which are coaxial; the external thread of the front cover is in threaded fit with the internal thread at the front end of the cylinder barrel; the sealing bush comprises a bush front section and a bush rear section, the bush rear section is in sealing fit between the outer wall of the piston rod and the inner wall of the cylinder barrel, the bush front section is clamped between the outer wall of the piston rod and the inner ring of the front cover, and a circle of expansion cavity is formed in the bush front section.
Further, a first limiting step surface is arranged at the joint of the front section of the bushing and the rear section of the bushing, and the inner end surface of the front cover is in limiting fit with the first limiting step surface.
Further, an outer ring of the rear section of the bushing, which is close to one end of the first limiting step surface, is provided with a limiting convex ring; the inner wall of the cylinder barrel is provided with a second step limiting surface, and one end surface of the limiting convex ring far away from the front cover is in limiting fit with the second step limiting surface.
Further, a sealing ring groove is formed in the outer ring of the rear section of the bushing of the sealing bushing, and a sealing ring in the sealing ring groove is in movable sealing fit with the inner wall of the cylinder barrel.
Further, the inner wall of the sealing bush is integrally provided with a plurality of inner convex rings along the length direction, and each inner convex ring is in clearance fit with the piston rod.
Further, one end of the piston rod in the cylinder barrel is connected with a piston, and a front hydraulic bin is formed between the piston and the sealing bush; the inner wall of the wall body of the sealing bushing is embedded with a metal oil guide pipe along the length direction, one end of the metal oil guide pipe is communicated with the expansion cavity, and the pipe orifice of the other end is communicated with the front hydraulic bin.
The beneficial effects are that: when the pressure in the front hydraulic bin exceeds a normal interval, hydraulic oil in the front hydraulic bin is pressed into the annular expansion cavity through the metal oil guide pipe, and the front section of the bushing is expanded under the extrusion of the expansion cavity, so that the inner ring of the front section of the bushing further holds the piston rod tightly, the sealing performance and the friction force are enhanced, and the overflow of the hydraulic oil is avoided.
Drawings
FIG. 1 is an overall schematic diagram of the present solution;
FIG. 2 is a cross-sectional view of the present embodiment;
FIG. 3 is a cross-sectional view of the cylinder;
Fig. 4 is a schematic view of the seal bushing.
Detailed Description
The utility model will be further described with reference to the accompanying drawings.
A circular cylinder with a bushing sealing structure as shown in fig. 1 to 4 comprises a piston rod 10, a front cover 14, a cylinder barrel 12 and a sealing bushing 1 which are coaxial; the external thread of the front cover 14 is in threaded fit with the internal thread 9 at the front end of the cylinder barrel 12; as shown in fig. 4, the sealing bush 1 comprises a bush front section 1a and a bush rear section 1b, the bush rear section 1b is in sealing fit between the outer wall of the piston rod 10 and the inner wall of the cylinder 12, when a certain small eccentric amount exists between the piston rod 10 and the cylinder 12, the sealing bush 1 adaptively generates certain offset and deformation, so that oil leakage is avoided, the bush front section 1a is clamped between the outer wall of the piston rod 10 and the inner ring of the front cover 14, the front cover 14 is only used for positioning the sealing bush 1, the sealing process is not directly participated, and the processing difficulty of the front cover is reduced; the sealing bush 1 is made of rubber or plastic with certain elasticity, and in the scheme, the sealing bush 1 can be designed into a hard inelastic structure; a circle of annular expansion cavity 2 is arranged in the front section 1a of the bushing; as shown in fig. 2, a piston 11 is connected to one end of the piston rod 10 in the cylinder tube 12, and a front hydraulic chamber 13 is formed between the piston 11 and the seal bush 1.
As shown in fig. 4, a metal oil guide pipe 3 is embedded in the inner wall of the wall body of the sealing bush 1 along the length direction, one end of the metal oil guide pipe 3 is communicated with the expansion cavity 2, and the pipe orifice 3.1 at the other end is communicated with the front hydraulic bin 13; when the pressure in the front hydraulic bin 13 is in a normal interval, the pressure is insufficient to expand the expansion cavity 2, the smoothness of the movement of the piston rod 10 is ensured, when the pressure in the front hydraulic bin 13 exceeds the normal interval, hydraulic oil in the front hydraulic bin 13 is pressed into the annular expansion cavity 2 through the metal oil guide pipe 3, and the front section 1a of the bushing is expanded under the extrusion of the expansion cavity 2, so that the inner ring of the front section 1a of the bushing further holds the piston rod 10 tightly, the friction force is enhanced, the sealing performance is enhanced, and the overflow of the hydraulic oil is avoided.
As shown in fig. 4, a first limiting step surface 4 exists at the joint of the front section 1a of the bushing and the rear section 1b of the bushing, and the inner end surface of the front cover 14 is in limiting fit with the first limiting step surface 4; the outer ring of the rear section 1b of the bushing, which is close to one end of the first limiting step surface 4, is provided with a limiting convex ring 5; the inner wall of the cylinder barrel 12 is provided with a second step limiting surface 8, and one end surface of the limiting convex ring 5, which is far away from the front cover 14, is in limiting fit with the second step limiting surface 8; under the cooperative positioning of the first limiting step surface 4 and the second limiting step surface 8, when the external thread of the front cover 14 and the internal thread 9 at the front end of the cylinder barrel 12 are in a screwed state, the sealing bushing 1 is completely positioned, so that the problem of falling out in the process of back and forth displacement of the piston rod 10 is solved; in the scheme, the front cover 14 is only used for positioning the sealing bush 1, does not directly participate in the sealing process, and reduces the processing difficulty of the front cover.
The outer ring of the rear section 1b of the sealing bushing 1 is provided with a sealing ring groove 6, and a sealing ring 19 in the sealing ring groove 6 is in movable sealing fit with the inner wall of the cylinder barrel 12; the inner wall of the sealing bush 1 is integrally provided with a plurality of inner convex rings 7 along the length direction, a ring cavity is formed between two adjacent inner convex rings 7, each inner convex ring 7 is in clearance fit with the outer wall of the piston rod 10, so that a labyrinth sealing structure is formed between the plurality of inner convex rings 7, the plurality of ring cavities and the outer wall of the piston rod 10, and the clearance fit between the inner convex rings 7 and the outer wall of the piston rod ensures the smoothness of the piston rod under normal conditions.
The foregoing is only a preferred embodiment of the utility model, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the utility model.
Claims (6)
1. A circular hydro-cylinder with bush seal structure, its characterized in that: comprises a coaxial piston rod (10), a front cover (14), a cylinder barrel (12) and a sealing bushing (1); the external thread of the front cover (14) is in threaded fit with the internal thread (9) at the front end of the cylinder barrel (12); the sealing bushing (1) comprises a bushing front section (1 a) and a bushing rear section (1 b), the bushing rear section (1 b) is in sealing fit between the outer wall of the piston rod (10) and the inner wall of the cylinder barrel (12), the bushing front section (1 a) is clamped between the outer wall of the piston rod (10) and the inner ring of the front cover (14), and a circle of expansion cavity (2) is arranged in the bushing front section (1 a).
2. The circular cylinder with bushing sealing structure according to claim 1, wherein: a first limiting step surface (4) is arranged at the joint of the front section (1 a) and the rear section (1 b) of the bushing, and the inner end surface of the front cover (14) is in limiting fit with the first limiting step surface (4).
3. The circular cylinder with bushing sealing structure according to claim 2, wherein: an outer ring of the rear section (1 b) of the bushing, which is close to one end of the first limiting step surface (4), is provided with a limiting convex ring (5); the inner wall of the cylinder barrel (12) is provided with a second step limiting surface (8), and one end surface of the limiting convex ring (5), which is far away from the front cover (14), is in limiting fit with the second step limiting surface (8).
4. A circular cylinder with a bushing seal structure as claimed in claim 3, wherein: the outer ring of the rear section (1 b) of the sealing bushing (1) is provided with a sealing ring groove (6), and a sealing ring (19) in the sealing ring groove (6) is in movable sealing fit with the inner wall of the cylinder barrel (12).
5. A circular cylinder with a bushing seal structure as claimed in claim 3, wherein: the inner wall of the sealing bushing (1) is integrally provided with a plurality of inner convex rings (7) along the length direction, and each inner convex ring (7) is in clearance fit with the outer wall of the piston rod (10).
6. A circular cylinder with a bushing seal structure as claimed in claim 3, wherein: one end of the piston rod (10) in the cylinder barrel (12) is connected with a piston (11), and a front hydraulic bin (13) is formed between the piston (11) and the sealing bush (1); the inner wall of the wall body of the sealing bushing (1) is embedded with a metal oil guide pipe (3) along the length direction, one end of the metal oil guide pipe (3) is communicated with the expansion cavity (2), and the pipe orifice (3.1) at the other end is communicated with the front hydraulic bin (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323180534.0U CN221033437U (en) | 2023-11-24 | 2023-11-24 | Round oil cylinder with bushing sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323180534.0U CN221033437U (en) | 2023-11-24 | 2023-11-24 | Round oil cylinder with bushing sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221033437U true CN221033437U (en) | 2024-05-28 |
Family
ID=91166533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323180534.0U Active CN221033437U (en) | 2023-11-24 | 2023-11-24 | Round oil cylinder with bushing sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221033437U (en) |
-
2023
- 2023-11-24 CN CN202323180534.0U patent/CN221033437U/en active Active
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| GR01 | Patent grant |