CN214171004U - Piston rod limit structure for hydraulic cylinder - Google Patents
Piston rod limit structure for hydraulic cylinder Download PDFInfo
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- CN214171004U CN214171004U CN202023345820.4U CN202023345820U CN214171004U CN 214171004 U CN214171004 U CN 214171004U CN 202023345820 U CN202023345820 U CN 202023345820U CN 214171004 U CN214171004 U CN 214171004U
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Abstract
The utility model discloses a piston rod limit structure for pneumatic cylinder belongs to pneumatic cylinder technical field. Comprises a cylinder barrel, a cylinder bottom and a piston rod; the piston rod is slidably arranged in the cylinder barrel, and the middle part of the piston rod is provided with an outer chamfer; the middle part of the inner wall of the cylinder barrel is provided with an inner chamfer, and the inner chamfer and the outer chamfer are relatively matched in the axial direction. The cylinder barrel of the utility model is directly used as a piston rod guide structure, and a guide structure is not required to be additionally installed; when the outer chamfer angle of the piston rod contacts the inner chamfer angle of the cylinder barrel, the two chamfer angles form a limiting structure; the hydraulic oil cylinder has the advantages that the internal structure and the limiting structure of the hydraulic oil cylinder are simple, the stroke of the hydraulic oil cylinder is short, the wall thickness of the cylinder barrel is thick, the hydraulic oil cylinder can be installed in a narrow space, and high-frequency impact and large lateral load can be borne.
Description
Technical Field
The utility model relates to a pneumatic cylinder technical field specifically is a piston rod limit structure for pneumatic cylinder.
Background
The hydraulic cylinder in the engineering machinery industry mostly adopts an oil-gas mixing mode to achieve limiting when a piston rod at a certain position stops moving, the limiting mode has higher requirement on the air tightness of a sealing system of the hydraulic cylinder, the internal structure of the hydraulic cylinder is more complex, and the hydraulic cylinder is difficult to be suitable for the hydraulic cylinder with more severe working conditions and narrower space.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a piston rod limit structure for pneumatic cylinder.
The utility model discloses a following technical scheme realizes: a piston rod limiting structure for a hydraulic cylinder comprises a cylinder barrel, a cylinder bottom and a piston rod; the piston rod is slidably arranged in the cylinder barrel, and the middle part of the piston rod is provided with an outer chamfer; the middle part of the inner wall of the cylinder barrel is provided with an inner chamfer, and the inner chamfer and the outer chamfer are relatively matched in the axial direction.
It further comprises the following steps: the outer periphery of the piston rod is in a two-step type, the front end of the piston rod is in a stage of a large-diameter piston rod platform, and the rear end of the piston rod is in a stage of a small-diameter piston rod platform; the stage of the large-diameter platform of the piston rod and the stage of the small-diameter platform of the piston rod are in transition connection through the outer chamfer; the inner wall of the cylinder barrel is in a two-step type, the front end of the inner wall of the cylinder barrel is a stage of a large-diameter platform of the cylinder barrel, and the rear end of the inner wall of the cylinder barrel is a stage of a small-diameter platform of the cylinder barrel; the cylinder barrel large-diameter platform stage and the cylinder barrel small-diameter platform stage are in transition connection through the inner chamfer; the piston rod large-diameter stage is in sliding fit with the cylinder barrel large-diameter stage; and the small-diameter platform stage of the piston rod is in sliding fit with the small-diameter step section of the cylinder barrel.
The piston rod is a hollow piston rod, and the front end of the piston rod is provided with an earring through threaded connection.
The cylinder bottom is provided with a mounting hole.
A groove is formed in the inner wall of the front end of the cylinder barrel, and a sealing device matched with the piston rod is installed in the groove.
Compared with the prior art, the beneficial effects of the utility model are that: the cylinder barrel is directly used as a piston rod guide structure, and a guide structure is not required to be additionally installed; when the outer chamfer angle of the piston rod contacts the inner chamfer angle of the cylinder barrel, the two chamfer angles form a limiting structure; the hydraulic oil cylinder has the advantages that the internal structure and the limiting structure of the hydraulic oil cylinder are simple, the stroke of the hydraulic oil cylinder is short, the wall thickness of the cylinder barrel is thick, the hydraulic oil cylinder can be installed in a narrow space, and high-frequency impact and large lateral load can be borne.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
in the figure: 1. an ear ring; 2. a sealing device; 3. a piston rod; 3-1, a piston rod large-diameter stage; 3-2, chamfering; 3-3, a stage of piston rod small diameter table; 4. a cylinder barrel; 4-1, cylinder barrel large diameter stage; 4-2, inner chamfer angle; 4-3, cylinder small diameter stage; 5. a cylinder bottom.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, in the piston rod limiting structure for the hydraulic cylinder, the outer periphery of a piston rod 3 is in a two-step type, the front end of the piston rod 3 is a piston rod large-diameter stage 3-1, and the rear end of the piston rod 3 is a piston rod small-diameter stage 3-3; the stage 3-1 of the large-diameter platform of the piston rod and the stage 3-3 of the small-diameter platform of the piston rod are in transition connection through an outer chamfer 3-2.
The inner wall of the cylinder barrel 4 is in a two-step type, the front end of the inner wall of the cylinder barrel 4 is a cylinder barrel large-diameter platform stage 4-1, and the rear end of the inner wall of the cylinder barrel 4 is a cylinder barrel small-diameter platform stage 4-3; the cylinder barrel large-diameter platform stage 4-1 and the cylinder barrel small-diameter platform stage 4-3 are in transition connection through an inner chamfer 4-2.
The large-diameter stage 3-1 of the piston rod is in sliding fit with the large-diameter stage 4-1 of the cylinder barrel, the small-diameter stage 3-3 of the piston rod is in sliding fit with the small-diameter stage 4-3 of the cylinder barrel, the inner chamfer 4-2 is in axial opposite-joint with the outer chamfer 3-2, and when the inner chamfer 4-2 is in contact with the outer chamfer 3-2, the plane of the inner chamfer 4-2 is tangent to the plane of the outer chamfer 3-2.
The piston rod 3 is a hollow piston rod, and the front end of the piston rod 3 is provided with an earring 1 through threaded connection. The cylinder bottom 5 is provided with a mounting hole. A groove is formed in the inner wall of the front end of the cylinder barrel 4, and a sealing device 2 matched with the piston rod 3 is installed in the groove.
The working principle is as follows:
the piston rod 3 extends out under the action of oil pressure, and the piston rod stops when the outer chamfer step moves to the groove on the right side of the sealing device 2;
the piston rod is retracted under the action of external force, when the step 3-2 of the outer chamfer of the piston rod 3 moves to the step 4-2 of the inner chamfer of the cylinder barrel 4, the inner chamfer 4-2 is abutted against the outer chamfer 3-, and the piston rod is limited and stops moving.
This embodiment increases one chamfer structure at the cylinder hole, increases one chamfer structure corresponding to piston rod excircle department, and reciprocating motion between cylinder hole chamfer and seal groove is located to the piston rod, and when piston rod excircle chamfer and cylinder hole chamfer contact, piston rod stop motion, twice chamfer constitute a limit structure. The cylinder barrel and the piston rod are simple in limiting structure, the hydraulic oil cylinder is short in stroke and thick in wall thickness of the cylinder barrel, and can be installed in a narrow space and bear high-frequency impact and large lateral load.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A piston rod limiting structure for a hydraulic cylinder comprises a cylinder barrel (4), a cylinder bottom (5) and a piston rod (3); the method is characterized in that: the piston rod (3) is slidably arranged in the cylinder barrel (4), and the middle part of the piston rod (3) is provided with an outer chamfer (3-2); the middle part of the inner wall of the cylinder barrel (4) is provided with an inner chamfer (4-2), and the inner chamfer (4-2) is in relative joint with the outer chamfer (3-2) in the axial direction.
2. The piston rod limit structure for a hydraulic cylinder according to claim 1, characterized in that: the outer peripheral surface of the piston rod (3) is in a two-step type, the front end of the piston rod (3) is a piston rod large-diameter stage (3-1), and the rear end of the piston rod (3) is a piston rod small-diameter stage (3-3); the piston rod large-diameter stage (3-1) and the piston rod small-diameter stage (3-3) are in transition connection through the outer chamfer (3-2);
the inner wall of the cylinder barrel (4) is in a two-step type, the front end of the inner wall of the cylinder barrel (4) is a cylinder barrel large-diameter platform stage (4-1), and the rear end of the inner wall of the cylinder barrel (4) is a cylinder barrel small-diameter platform stage (4-3); the cylinder barrel large-diameter platform stage (4-1) and the cylinder barrel small-diameter platform stage (4-3) are in transition connection through the inner chamfer (4-2);
the piston rod large-diameter table stage (3-1) is in sliding fit with the cylinder barrel large-diameter table stage (4-1); the piston rod small-diameter platform stage (3-3) is in sliding fit with the cylinder barrel small-diameter platform stage (4-3).
3. The piston rod limit structure for a hydraulic cylinder according to claim 1, characterized in that: the piston rod (3) is a hollow piston rod, and the front end of the piston rod (3) is provided with an earring (1) through threaded connection.
4. The piston rod limit structure for a hydraulic cylinder according to claim 1, characterized in that: the cylinder bottom (5) is provided with a mounting hole.
5. The piston rod limit structure for a hydraulic cylinder according to claim 1, characterized in that: a groove is formed in the inner wall of the front end of the cylinder barrel (4), and a sealing device (2) matched with the piston rod (3) is installed in the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023345820.4U CN214171004U (en) | 2020-12-31 | 2020-12-31 | Piston rod limit structure for hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023345820.4U CN214171004U (en) | 2020-12-31 | 2020-12-31 | Piston rod limit structure for hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214171004U true CN214171004U (en) | 2021-09-10 |
Family
ID=77592752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023345820.4U Active CN214171004U (en) | 2020-12-31 | 2020-12-31 | Piston rod limit structure for hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214171004U (en) |
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2020
- 2020-12-31 CN CN202023345820.4U patent/CN214171004U/en active Active
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