CN210660814U - Constant speed oil cylinder - Google Patents
Constant speed oil cylinder Download PDFInfo
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- CN210660814U CN210660814U CN201921387167.2U CN201921387167U CN210660814U CN 210660814 U CN210660814 U CN 210660814U CN 201921387167 U CN201921387167 U CN 201921387167U CN 210660814 U CN210660814 U CN 210660814U
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- piston
- cylinder
- inner piston
- rod
- cavity
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- 239000003921 oil Substances 0.000 claims description 23
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The utility model relates to a hydraulic cylinder technical field, especially a constant velocity hydro-cylinder, this hydro-cylinder includes the cylinder, main piston and piston rod, the internal inner piston chamber that has of combination that constitutes at main piston and piston rod, the inner piston intracavity has the inner piston, the rear end in inner piston chamber communicates through the rodless chamber of first runner with the cylinder, the front end in inner piston chamber communicates through the pole chamber that has of second runner and cylinder, the inner piston has the way of lining up, the setting of staggering with first runner is said to lining up of inner piston, the spring still has in the inner piston intracavity, promote the inner piston on the piston including the spring action and remove the rear end in inner piston chamber and seal first runner, the cylinder effect is the first runner of inner piston removal to the inner piston chamber, theThe inner diameter a of the cylinder being
The outer diameter b of the piston rod is D. The utility model has the advantages that: the constant-speed oil cylinder is more compact in structure relative to a constant-speed oil cylinder in a double-rod-out form or an inner inserted rod form, and the expansion speed is slightly slower than that of a double-rod-out form but stronger than that of an inner inserted form.
Description
Technical Field
The utility model relates to a hydraulic cylinder technical field, especially a constant velocity hydro-cylinder.
Background
In some applications, a constant velocity cylinder is required, i.e. the piston rod extends and retracts with the same time. Typically, prior art constant velocity cylinders are in the form of a double stick or an internal stick. The oil cylinder in the double-rod form has relatively large volume, and the installation form can only adopt the form of a middle trunnion; the structure of the inner inserted rod type is complex, the processing requirement is high, and the stretching speed is slightly different.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: provided is a constant velocity oil cylinder with a compact structure.
The utility model provides a technical scheme that its technical problem adopted is: the constant-speed oil cylinder comprises a cylinder barrel, a main piston and a piston rod, wherein the main piston is arranged in the cylinder barrel, the rear end of the piston rod is connected with the main piston, the front end of the piston rod extends out of the cylinder barrel, an inner piston cavity is formed in a combined body formed by the main piston and the piston rod, an inner piston is arranged in the inner piston cavity, the rear end of the inner piston cavity is communicated with a rodless cavity of the cylinder barrel through a first flow passage, the front end of the inner piston cavity is communicated with a rod cavity of the cylinder barrel through a second flow passage, the inner piston is provided with a through passage, the through passage of the inner piston is staggered with the first flow passage, a spring is further arranged in the inner piston cavity, the spring acts on the inner piston to push the inner piston to move to the rear end of the inner
The outer diameter b of the piston rod is D.
Further, the second flow passage is positioned in the piston rod and is formed by an axial flow passage and a radial flow passage which are communicated with each other, and the axial flow passage is coaxial with the through passage of the inner piston.
Further, the inner piston cavity is positioned in the main piston, an end cover for blocking the inner piston cavity is arranged on the rear end face of the main piston, and the first flow passage is arranged on the end cover.
Further limited, the constant-speed oil cylinder is a double-acting single-piston-rod hydraulic oil cylinder.
The utility model has the advantages that: the constant-speed oil cylinder is more compact in structure relative to a constant-speed oil cylinder in a double-rod-out form or an inner inserted rod form, and the expansion speed is slightly slower than that of a double-rod-out form but stronger than that of an inner inserted form.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
In the figure, 1 is a piston rod, 3 is a main piston, 4 is a spring, 5 is an inner piston, 6 is an end cover, 8 is a cylinder barrel, 9 is a first flow passage, and 10 is a second flow passage.
Detailed Description
As shown in figure 1, the constant-speed oil cylinder belongs to a double-acting single-piston-rod hydraulic oil cylinder and comprises a cylinder barrel 8, a main piston 3 and a piston rod 1, wherein the main piston 3 is arranged in the cylinder barrel 8, the rear end of the piston rod 1 is connected with the main piston 3, the front end of the piston rod 1 extends out of the cylinder barrel 8, an inner piston cavity is formed in a combined body formed by the main piston 3 and the piston rod 1, an inner piston 5 is arranged in the inner piston cavity, the rear end of the inner piston cavity is communicated with a rodless cavity of the cylinder barrel 8 through a first flow passage 9, the front end of the inner piston cavity is communicated with a rod cavity of the cylinder barrel 8 through a second flow passage 10, the inner piston 5 is provided with a through passage, the through passage of the inner piston 5 is staggered with the first flow passage 9, a spring 4 is also arranged in the inner piston cavity, the spring 4 acts on the inner piston 5 to push the inner piston 5 to move backwards
The outer diameter b of the piston rod 1 is D and the inner diameter a of the cylinder 8 is equal to the outer diameter of the main piston.
Specifically, the second flow passage 10 is located inside the piston rod and is composed of an axial flow passage and a radial flow passage which are communicated with each other, and the axial flow passage is coaxial with the through passage of the inner piston 5. The inner piston cavity is located in the main piston 3, an end cover 6 for blocking the inner piston cavity is arranged on the rear end face of the main piston 3, and a first flow passage 9 is arranged on the end cover 6. The two ends of the constant-speed oil cylinder are provided with a rod cavity oil port and a rodless cavity oil port.
The principle of this embodiment is as follows:
when the oil inlet of the oil port of the rod cavity is formed, the inner piston 5 is tightly attached to the end cover 6, the oil pressure P1 of the rod cavity cannot enter the rodless cavity from the rod cavity, the piston rod 1 outputs a pulling force F, and the effective action area of the oil pressure P1 of the rod cavity is the area between the inner diameter a of the cylinder barrel 8 and the outer diameter b of the piston rod 1.
When the oil inlet of the rodless cavity is performed, the inner piston 5 is pushed away from the end cover 6 by the rodless cavity oil pressure P2, the rod cavity is communicated with the rodless cavity, the piston rod 1 outputs the thrust force f, and the effective action area of the rodless cavity oil pressure P2 is the sectional area of the piston rod 1.
When P1 is equal to P2, F is equal to F, and the oil cylinder is a constant speed oil cylinder.
Claims (4)
1. The utility model provides a constant velocity oil cylinder, includes cylinder (8), master piston (3) and piston rod (1), and master piston (3) set up in cylinder (8), and the rear end and the master piston (3) of piston rod (1) are connected, and cylinder (8), characterized by are stretched out to the front end of piston rod (1): an inner piston cavity is arranged in a combined body formed by the main piston (3) and the piston rod (1), an inner piston (5) is arranged in the inner piston cavity, the rear end of the inner piston cavity is communicated with a rodless cavity of the cylinder barrel (8) through a first flow passage (9), the front end of the inner piston cavity is communicated with a rod cavity of the cylinder barrel (8) through a second flow passage (10),
the inner piston (5) is provided with a through passage, the through passage of the inner piston (5) is staggered with the first flow passage (9), a spring (4) is also arranged in the inner piston cavity, the spring (4) acts on the inner piston (5) to push the inner piston (5) to move to the rear end of the inner piston cavity to seal the first flow passage (9),
the inner diameter a of the cylinder (8) is
The outer diameter b of the piston rod (1) is D.
2. The constant velocity cylinder according to claim 1, wherein: the second flow passage (10) is positioned in the piston rod (1) and is composed of an axial flow passage and a radial flow passage which are communicated with each other, and the axial flow passage is coaxial with the through passage of the inner piston (5).
3. The constant velocity cylinder according to claim 2, wherein: the inner piston cavity is positioned in the main piston (3), an end cover (6) for plugging the inner piston cavity is arranged on the rear end face of the main piston (3), and the first flow passage (9) is arranged on the end cover (6).
4. The constant velocity oil cylinder according to claim 1, 2 or 3, wherein: the constant-speed oil cylinder is a double-acting single-piston-rod hydraulic oil cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921387167.2U CN210660814U (en) | 2019-08-23 | 2019-08-23 | Constant speed oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921387167.2U CN210660814U (en) | 2019-08-23 | 2019-08-23 | Constant speed oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210660814U true CN210660814U (en) | 2020-06-02 |
Family
ID=70817760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921387167.2U Expired - Fee Related CN210660814U (en) | 2019-08-23 | 2019-08-23 | Constant speed oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210660814U (en) |
-
2019
- 2019-08-23 CN CN201921387167.2U patent/CN210660814U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200602 |