CN216554721U - Piston structure and hydraulic cylinder - Google Patents
Piston structure and hydraulic cylinder Download PDFInfo
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- CN216554721U CN216554721U CN202123438048.5U CN202123438048U CN216554721U CN 216554721 U CN216554721 U CN 216554721U CN 202123438048 U CN202123438048 U CN 202123438048U CN 216554721 U CN216554721 U CN 216554721U
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Abstract
The utility model provides a piston structure and a hydraulic cylinder. The first plug body is provided with a first cylindrical surface and a second cylindrical surface, and a first annular end surface which is perpendicular to the axis of the piston rod is formed between the second cylindrical surface and the first cylindrical surface. One end of the second plug body, which is close to the first plug body, is provided with a second circular ring end face matched with the first circular ring end face, and the second circular ring end face, the first circular ring end face and the second cylindrical surface jointly enclose to form an annular groove. The sealing washer is the annular setting in the annular groove, and the outer fringe is used for sliding the butt with the inner wall of cylinder body. The piston structure provided by the utility model changes the conventional integrated piston structure, can ensure the installation of the sealing ring, can adapt to the manufacturing errors of all parts, ensures the assembly effect, can prolong the service life and has strong practicability.
Description
Technical Field
The utility model belongs to the technical field of hydraulic cylinders, and particularly relates to a piston structure and a hydraulic cylinder.
Background
The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has simple structure and reliable operation. When it is used to implement reciprocating motion, it can omit speed-reducing device, and has no transmission gap, and its motion is stable, so that it can be extensively used in various mechanical hydraulic systems. The hydraulic cylinder mainly comprises a cylinder body, a piston rod and a piston structure. The piston structure mainly separates the hydraulic oil in the two oil cavities, and then ensures that the piston rod is driven to reciprocate in the cylinder body.
In the prior art, a piston structure generally comprises a sliding plug, a sealing ring and a guide ring, wherein the sealing ring and the guide ring are arranged on the outer wall of the sliding plug, and the sealing effect is mainly realized through the sealing ring. The clamping groove for the sealing ring to be arranged needs to be formed in advance in the structure, and then the sealing ring is clamped in the clamping groove. However, in practical use, due to manufacturing errors of the cylinder body and setting errors of the clamping groove, for example, the size of the clamping groove is slightly large, the actual assembling effect of the sealing ring is poor, oil leakage occurs, or the service life is short, and the practicability is poor. In addition, the hydraulic cylinder may be used at a low temperature, and oil leakage may occur due to expansion caused by heat and contraction caused by cold.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a piston structure and a hydraulic cylinder, and aims to solve the problem of poor practicability caused by poor assembly of the existing hydraulic cylinder piston structure.
In order to achieve the purpose, the utility model adopts the technical scheme that: providing a piston structure comprising:
the first plug body is sleeved on the piston rod; the first plug body is provided with a first cylindrical surface and a second cylindrical surface, the diameter of the second cylindrical surface is smaller than that of the first cylindrical surface, and a first annular end surface perpendicular to the axis of the piston rod is formed between the second cylindrical surface and the first cylindrical surface;
the second plug body is sleeved on the second cylindrical surface in a sliding manner along the axis direction of the first cylindrical surface and is detachably connected with the first plug body; the second plug body is provided with a first circumferential surface which has the same diameter as the first cylindrical surface and is coaxially arranged, and a cylindrical sliding cavity for the second cylindrical surface to insert into; a second annular end face matched with the first annular end face is formed at one end, close to the first plug body, of the second plug body, and the second annular end face, the first annular end face and the second cylindrical surface jointly enclose to form an annular groove; and
the sealing ring is annularly arranged in the annular groove, and the outer edge of the sealing ring is used for being in sliding butt joint with the inner wall of the cylinder body;
and adjusting the second plug body, wherein the end face of the second ring is close to the end face of the first ring and extrudes the sealing ring, and the pressure of the outer edge of the sealing ring and the inner wall of the cylinder body is increased through the deformation of the sealing ring.
In one possible implementation, the first plug body includes a fixing portion and a connecting portion; the first cylindrical surface and the second cylindrical surface are both positioned on the fixing part; the connecting part is positioned at one end of the fixing part far away from the first cylindrical surface and is integrally connected with the fixing part in a forming way, the connecting part is provided with a circular outer wall surface which is coaxial with the first cylindrical surface or the second cylindrical surface, and the circular outer wall surface is provided with external threads;
and an internal thread which is matched with the external thread on the circular outer wall surface and is in threaded connection with the external thread is arranged in the sliding cavity.
In some embodiments/exemplarily/examples, the diameter of the circular outer wall surface is smaller than the diameter of the second cylindrical surface;
the sliding cavity penetrates through two ends of the second plug body, and comprises a first sub cavity for the second cylindrical surface to be inserted into and a second sub cavity matched with the circular outer wall surface and in threaded connection with the circular outer wall surface.
In one possible implementation, the sealing ring is a gray ring.
In a possible implementation manner, the first plug body is provided with a through hole for the piston rod to pass through, and the through hole is arranged in a collinear manner with the axis of the first cylindrical surface or the second cylindrical surface.
In a possible implementation manner, the piston structure further includes two guide rings, and the two guide rings are respectively sleeved on the first cylindrical surface and the first circumferential surface and arranged in a collinear manner with an axis of the first cylindrical surface or the first circumferential surface;
and mounting ring grooves for arranging the guide rings are formed in the first cylindrical surface and the first circumferential surface.
The utility model also provides a piston structure, which comprises the piston structure.
In this implementation/application embodiment, the first plug body and the second plug body are provided, and the first plug body and the second plug body are provided as a split combination type, and an annular groove can be directly formed between the first plug body and the second plug body. Through the regulation to the annular groove width, outside guaranteeing to stabilize the centre gripping effect to the sealing washer, can also adjust the sealing washer extrusion force, after the sealing washer is extruded deformation, the sealing washer can extend to the outside of annular groove, and then can guarantee with the inseparable butt of cylinder body inner wall. The structure changes the original integral piston structure, can ensure the installation of the sealing ring, can adapt to the manufacturing error of each part, ensures the assembly effect, can improve the service life and has strong practicability.
Drawings
FIG. 1 is a schematic structural diagram of a piston structure provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first plug structure of a piston structure provided in an embodiment of the utility model;
FIG. 3 is a schematic diagram of a second plug structure of the piston structure provided in the embodiment of the present invention;
description of reference numerals:
10. a first plug body; 11. a fixed part; 12. a connecting portion; 13. a via hole; 14. a first cylindrical surface; 15. A second cylindrical surface; 16. a first annular end surface; 20. a second plug body; 21. a first circumferential surface; 22. a second annular end surface; 23. a slide chamber; 30. a seal ring; 40. a guide ring.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.
Referring to fig. 1 to 3 together, the piston structure provided by the present invention will now be described. The piston structure comprises a first plug body 10, a second plug body 20 and a sealing ring 30. The first plug 10 is disposed on the piston rod 50. The first plug 10 has a first cylindrical surface 14 and a second cylindrical surface 15, the diameter of the second cylindrical surface 15 is smaller than that of the first cylindrical surface 14, and a first annular end surface 16 arranged perpendicular to the axis of the piston rod 50 is formed between the second cylindrical surface 15 and the first cylindrical surface 14. The second plug body 20 is sleeved on the second cylindrical surface 15 in a sliding manner along the axial direction of the first cylindrical surface 14 and is detachably connected with the first plug body 10; the second plug 20 has a first circumferential surface 21 with the same diameter as the first cylindrical surface 14 and arranged coaxially, and has a cylindrical sliding cavity 23 for the second cylindrical surface 15 to insert; a second annular end face 22 matched with the first annular end face 16 is formed at one end, close to the first plug body 10, of the second plug body 20, and the second annular end face 22, the first annular end face 16 and the second cylindrical surface 15 jointly enclose to form an annular groove. The seal ring 30 is annularly disposed in the annular groove with an outer edge for sliding abutment with the inner wall of the cylinder 60.
Wherein, adjusting the second plug 20, the second ring end face 22 is close to the first ring end face 16, and extrudes the seal ring 30, and the pressure between the outer edge of the seal ring 30 and the inner wall of the cylinder 60 is increased by the deformation of the seal ring 30.
Compared with the prior art, the piston structure provided by the embodiment is provided with the first plug body 10 and the second plug body 20, the first plug body 10 and the second plug body 20 are arranged in a split combined mode, and the annular groove can be directly formed between the first plug body 10 and the second plug body 20. Through the regulation to the annular groove width, outside guaranteeing to stabilize the centre gripping effect to sealing washer 30, can also adjust the sealing washer 30 extrusion force, after sealing washer 30 is extruded deformation, sealing washer 30 can extend to the outside of annular groove, and then can guarantee with the inseparable butt of cylinder body 60 inner wall. The structure changes the original integral piston structure, can ensure the installation of the sealing ring 30, can adapt to the manufacturing error of each part, ensures the assembly effect, can improve the service life and has strong practicability.
In some embodiments, the first plug body 10 may be configured as shown in FIG. 2. Referring to fig. 2, the first plug 10 includes a fixing portion 11 and a connecting portion 12; the first cylindrical surface 14 and the second cylindrical surface 15 are both positioned on the fixing part 11; the connecting portion 12 is located at an end of the fixing portion 11 away from the first cylindrical surface 14, and is integrally formed with the fixing portion 11, the connecting portion 12 has a circular outer wall surface coaxially disposed with the first cylindrical surface 14 or the second cylindrical surface 15, and an external thread is disposed on the circular outer wall surface. The sliding cavity 23 is internally provided with an internal thread which is matched with the external thread on the circular outer wall surface and is in threaded connection, and the threaded connection has the characteristics of simple structure and high connection strength. The appearance structure of first cock body 10 is the step shaft shape, and the formation of annular groove can be guaranteed to first face of cylinder 14 and the second face of cylinder 15 that fixed part 11 set up, and connecting portion 12 can be the drum with fixed part 11 body coupling, and is equipped with the screw thread on the periphery, and the preparation processing of can being convenient for of this kind of structure, simple structure.
In some embodiments, the second plug 20 and the sliding cavity 23 may be configured as shown in fig. 2 to 3. Referring to fig. 2 to 3, the diameter of the circular outer wall surface is smaller than the diameter of the second cylindrical surface 15. The structure can make the first plug 10 have a three-step structure, please refer to fig. 2, and the sliding cavity 23 penetrates through two ends of the second plug 20, and the sliding cavity 23 includes a first sub-cavity for inserting the second cylindrical surface 15 and a second sub-cavity adapted to the circular outer wall surface and in threaded connection. The homogeneity of first cock body 10 and the 20 weight of second cock body can be guaranteed to this kind of structure to can shorten threaded connection's distance, the thickness of second cock body 20 in the sub chamber department of second can be guaranteed to this kind of structure in addition, and then guarantees holistic structural strength, simple structure, the preparation of being convenient for.
In addition, in some embodiments, the first limit end face and the second limit end face may be both inclined faces, and form a clamping groove with an isosceles trapezoid cross section by enclosing with the second cylindrical surface 15, and this kind of structure can ensure stable clamping of the seal ring 30 to prevent the seal ring 30 from separating from the annular groove, and can increase the contact area with the seal ring 30, and seal two sliding connection positions of the threaded connection part and the inner wall of the cylinder body.
In some embodiments, the seal ring 30 may be configured as shown in FIG. 1. Referring to fig. 1, the seal ring 30 is a gray ring. The Glare ring has the characteristics of low friction force, no creeping, small starting force, high pressure resistance and the like. The outer edge is brought into close contact with the inner wall of the cylinder 60 by elastic deformation of the seal ring 30, thereby preventing leakage of the pressure liquid. The Glare circle is prior art and will not be described herein.
In some embodiments, the first plug body 10 may be configured as shown in fig. 1-2. Referring to fig. 1 to 2, the first plug body 10 is provided with a through hole 13 for passing the piston rod 50 therethrough, and the through hole 13 is arranged in line with the axis of the first cylindrical surface 14 or the second cylindrical surface 15.
In this embodiment, one end of the piston rod 50 directly passes through the through hole 13, and the tail end can lock the first plug body 10 and the second plug body 20 onto the piston rod 50 through nuts. The piston rod 50 is sleeved with a sealing rubber ring having a hole and located in the through hole 13 to ensure the sealing property between the first plug 10 and the piston rod 50.
In some embodiments, referring to fig. 1, the piston structure further includes two guide rings 40, and two guide rings 40 are provided, and the two guide rings 40 are respectively sleeved on the first cylindrical surface 14 and the first circumferential surface 21 and are arranged in a collinear manner with the axis of the first cylindrical surface 14 or the first circumferential surface 21. Mounting ring grooves for mounting the guide ring 40 are provided on both the first cylindrical surface 14 and the first circumferential surface 21. The guide ring 40 mainly plays a role of supporting and guiding, and the structure of the guide ring 40 is prior art and is not described herein again.
The embodiment of the application also provides a hydraulic cylinder, which comprises the piston structure.
Compared with the prior art, the piston structure that this embodiment provided, through the piston structure who sets up, changed integral type piston structure in the past, can guarantee to the installation of sealing washer 30, adaptation expend with heat and contract with cold can the reinforce, can adapt to the manufacturing error of each part moreover, guarantees the assembly effect, can improve life, and the practicality is strong.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A piston structure, comprising:
the first plug body is sleeved on the piston rod; the first plug body is provided with a first cylindrical surface and a second cylindrical surface, the diameter of the second cylindrical surface is smaller than that of the first cylindrical surface, and a first annular end surface perpendicular to the axis of the piston rod is formed between the second cylindrical surface and the first cylindrical surface;
the second plug body is sleeved on the second cylindrical surface in a sliding manner along the axis direction of the first cylindrical surface and is detachably connected with the first plug body; the second plug body is provided with a first circumferential surface which has the same diameter as the first cylindrical surface and is coaxially arranged, and a cylindrical sliding cavity for the second cylindrical surface to insert into; a second annular end face matched with the first annular end face is formed at one end, close to the first plug body, of the second plug body, and the second annular end face, the first annular end face and the second cylindrical surface jointly enclose to form an annular groove; and
the sealing ring is annularly arranged in the annular groove, and the outer edge of the sealing ring is used for being in sliding butt joint with the inner wall of the cylinder body;
and adjusting the second plug body, wherein the end face of the second ring is close to the end face of the first ring and extrudes the sealing ring, and the pressure of the outer edge of the sealing ring and the inner wall of the cylinder body is increased through the deformation of the sealing ring.
2. The piston structure of claim 1 wherein said first plug body includes a fixed portion and a connecting portion; the first cylindrical surface and the second cylindrical surface are both positioned on the fixing part; the connecting part is positioned at one end of the fixing part far away from the first cylindrical surface and is integrally connected with the fixing part in a forming way, the connecting part is provided with a circular outer wall surface which is coaxial with the first cylindrical surface or the second cylindrical surface, and the circular outer wall surface is provided with external threads;
and an internal thread which is matched with the external thread on the circular outer wall surface and is in threaded connection with the external thread is arranged in the sliding cavity.
3. The piston structure of claim 2 wherein said circular outer wall surface has a diameter less than a diameter of said second cylindrical surface;
the sliding cavity penetrates through two ends of the second plug body, and comprises a first sub cavity for the second cylindrical surface to be inserted into and a second sub cavity matched with the circular outer wall surface and in threaded connection with the circular outer wall surface.
4. The piston structure of claim 1 wherein said seal ring is a gray ring.
5. The piston arrangement of claim 1, wherein said first plug body is provided with a through hole for passing a piston rod therethrough, said through hole being disposed in line with the axis of said first cylindrical surface or said second cylindrical surface.
6. The piston structure of claim 1 further comprising two guide rings, wherein two of said guide rings are disposed around said first cylindrical surface and said first circumferential surface, respectively, and are disposed in line with the axis of said first cylindrical surface or said first circumferential surface;
and mounting ring grooves for arranging the guide rings are formed in the first cylindrical surface and the first circumferential surface.
7. Hydraulic cylinder, characterized in that it comprises a piston structure according to any of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123438048.5U CN216554721U (en) | 2021-12-31 | 2021-12-31 | Piston structure and hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123438048.5U CN216554721U (en) | 2021-12-31 | 2021-12-31 | Piston structure and hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216554721U true CN216554721U (en) | 2022-05-17 |
Family
ID=81560187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123438048.5U Active CN216554721U (en) | 2021-12-31 | 2021-12-31 | Piston structure and hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216554721U (en) |
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2021
- 2021-12-31 CN CN202123438048.5U patent/CN216554721U/en active Active
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