CN220890653U - Piston rod locking mechanism and hydraulic cylinder - Google Patents
Piston rod locking mechanism and hydraulic cylinder Download PDFInfo
- Publication number
- CN220890653U CN220890653U CN202322478477.8U CN202322478477U CN220890653U CN 220890653 U CN220890653 U CN 220890653U CN 202322478477 U CN202322478477 U CN 202322478477U CN 220890653 U CN220890653 U CN 220890653U
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- piston rod
- cylinder
- locking mechanism
- lock nut
- hydraulic cylinder
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- 210000004907 gland Anatomy 0.000 claims abstract description 30
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model provides a piston rod locking mechanism and a hydraulic oil cylinder. The piston rod locking mechanism comprises an external thread table arranged at the front end of a piston rod extending part of a hydraulic cylinder, a lock nut device movably sleeved on a cylinder barrel of the hydraulic cylinder, and a gland arranged at the top end of a cylinder cover of the hydraulic cylinder and used for limiting the lock nut device, wherein the radial section outer diameter of the gland is larger than that of the cylinder cover, an internal thread matched with the external thread table is arranged on the lock nut device, the internal thread of the lock nut device is in threaded engagement connection with the external thread table arranged on the piston rod, and the moving range of the lock nut device is limited by the gland, so that the piston rod of the hydraulic cylinder in a supporting state is locked and fixed by the lock nut device.
Description
Technical Field
The utility model relates to the technical field of hydraulic cylinders, in particular to a piston rod locking mechanism and a hydraulic cylinder.
Background
The landing leg hydro-cylinder belongs to one of the hydraulic cylinder, and it is one of the main parts of special chassis car, and the effect is the support basement of increase chassis car, lightens the tire burden, improves the anti-overturning stability of whole car. The landing leg oil cylinder is a supporting device arranged on the chassis of the crane, and as the working site is basically inclined and uneven, and the host machine vibrates, the piston rod can follow the vibration to cause the support failure of the landing leg oil cylinder, so that the hydraulic oil cylinder is required to extend out and be provided with a locking device.
In the prior art, as shown in fig. 1, a trapezoidal thread is generally provided at the front end of a piston rod 230, and a lock nut bracket 40 and a lock nut 50 are provided at the front end of a cylinder cover 220, and after the piston rod is extended, the lock nut 50 is engaged with the trapezoidal thread on the piston rod 230 to realize locking and fixing of the extended piston rod 230. However, the structure has the following defects that firstly, trapezoidal threads are added, so that the rod diameter of a piston rod is increased, and the cost of raw materials is increased; second, trapezoidal threads are more complex than traditional threads in terms of manufacturing process, require more processing time and technology, and have good transmission performance, but have poor self-locking function, and may cause self-locking failure due to vibration of a host.
Disclosure of utility model
The utility model aims to provide a piston rod locking mechanism and a hydraulic cylinder, which are used for solving the problems that trapezoidal threads are needed to ensure the transmission performance of a piston rod, the material cost is high, the processing cost is high and the self-locking capability is poor in the past.
In order to solve the technical problems, the utility model adopts the following technical scheme:
The utility model provides a piston rod locking mechanism which is arranged on a hydraulic cylinder and comprises an external thread table arranged at the front end of a piston rod extending part of the hydraulic cylinder, a locking nut device movably sleeved on a cylinder barrel of the hydraulic cylinder and a gland arranged at the top end of a cylinder cover of the hydraulic cylinder and used for limiting the locking nut device, wherein the radial section outer diameter of the gland is larger than that of the cylinder cover, and the locking nut device is provided with an internal thread matched with the external thread table so as to lock and fix a piston rod of the hydraulic cylinder in a supporting state.
According to some embodiments of the application, the lock nut device comprises a body with a cylindrical hollow part, a first inner boss arranged at one end of the body, and a second inner boss arranged at the other end of the body; the radial section inner diameters of the first inner boss and the second inner boss are smaller than the radial section outer diameter of the gland, so that the first inner boss is clamped against the gland when the lock nut device locks the piston rod; the internal thread is arranged on the second internal boss.
According to some embodiments of the application, the radial cross-sectional outer diameter of the gland is consistent with the radial cross-sectional diameter of the cylindrical hollow of the body.
In some embodiments of the application, the outer surface of the body is provided with at least one grip.
According to some embodiments of the application, the number of the grippers is four, and the four grippers are sequentially and uniformly distributed on the outer surface of the body.
According to some embodiments of the application, the axial cross-sectional width of the externally threaded land is greater than the axial cross-sectional width of the second internal boss.
According to some embodiments of the application, the external thread table is welded to the piston rod.
According to some embodiments of the application, the external thread and the internal thread are both common threads.
According to some embodiments of the application, the lock nut device is further provided with a avoiding groove for avoiding the outer surface part of the cylinder barrel.
The application also provides a hydraulic cylinder which comprises a cylinder barrel, a cylinder cover arranged at the end part of the cylinder barrel and used for sealing the cylinder barrel, a piston rod assembly arranged in the cylinder barrel and penetrating through the cylinder cover, and the piston rod locking mechanism.
As can be seen from the technical scheme, the embodiment of the utility model has at least the following advantages and positive effects:
The utility model provides a piston rod locking mechanism and a hydraulic oil cylinder. The piston rod locking mechanism comprises an external thread table arranged at the front end of a piston rod extending part of a hydraulic cylinder, a lock nut device movably sleeved on a cylinder barrel of the hydraulic cylinder, and a gland arranged at the top end of a cylinder cover of the hydraulic cylinder and used for limiting the lock nut device, wherein the radial section outer diameter of the gland is larger than that of the cylinder cover, an internal thread matched with the external thread table is arranged on the lock nut device, the internal thread of the lock nut device is in threaded engagement connection with the external thread table arranged on the piston rod, and the moving range of the lock nut device is limited by the gland, so that the piston rod of the hydraulic cylinder in a supporting state is locked and fixed by the lock nut device. The piston rod locking mechanism has simple structure and lower cost, can be suitable for batch production, and can be conveniently added on the hydraulic oil cylinder, so that the hydraulic oil cylinder, particularly the landing leg oil cylinder, can meet the limiting requirement of a special chassis truck under the working condition and the site.
Drawings
Various objects, features and advantages of the present utility model will become more apparent from the following detailed description of the preferred embodiments of the utility model, when taken in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the utility model and are not necessarily drawn to scale. In the drawings, like reference numerals refer to the same or similar parts throughout. Wherein:
Fig. 1 is an axial cross-sectional view of a prior art hydraulic ram.
Fig. 2 is a schematic diagram of the overall structure of a hydraulic cylinder according to an embodiment of the present utility model.
Fig. 3 is an axial cross-sectional schematic view of fig. 2.
Fig. 4 is a schematic view of the piston rod of fig. 2.
Fig. 5 is a schematic view of the nut lock mechanism of fig. 2.
The reference numerals are explained as follows:
10. An external thread table; 11. an external thread; 20. a lock nut device; 21. a body; 211. a grip; 212. an avoidance groove; 22. a first inner boss; 23. a second inner boss; 231. an internal thread; 30. a gland; 200. a hydraulic cylinder; 210. a cylinder; 220. a cylinder cover; 230. a piston rod; 40. a lock nut bracket; 50. and (5) locking the nut.
Detailed Description
While this utility model is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the utility model and is not intended to limit the utility model to that as illustrated.
Thus, rather than implying that each embodiment of the present utility model must have the characteristics described, one of the characteristics indicated in this specification will be used to describe one embodiment of the present utility model. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
In the embodiments shown in the drawings, indications of orientation (such as up, down, left, right, front and rear) are used to explain the structure and movement of the various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indication of these directions changes accordingly.
The present application provides a piston rod locking mechanism provided on the hydraulic cylinder 200 for locking the extension of the piston rod 230.
Fig. 3 is an axial cross-sectional view of a hydraulic cylinder according to the present application, and for convenience of understanding and explanation, it is now assumed that the direction of the extension of the piston rod 230 in fig. 3 is the right side in the horizontal direction, and the direction opposite to the extension of the piston rod 230 is the left side in the horizontal direction.
Referring to fig. 2 and 3, the piston rod locking mechanism includes an external screw table 10 disposed at the front end of the extension portion of the piston rod 230 of the hydraulic cylinder 200, a lock nut device 20 movably sleeved on the cylinder tube 210 of the hydraulic cylinder 200, and a pressing cover 30 disposed at the top end of the cylinder cover 220 of the hydraulic cylinder 200 for limiting the lock nut device 20.
Referring to fig. 4, an external thread stage 10 is provided on a piston rod 230 of a hydraulic cylinder 200, specifically in this embodiment, the external thread stage 10 has a circular cross-sectional profile, is fixed to a front end of an extension of the piston rod 230 by welding, and an external thread 11 is provided on an outer peripheral surface of the external thread stage 10, and the external thread 11 is a common thread.
The gland 30 is disposed at the top end of the cylinder cover 220 of the hydraulic cylinder 200, specifically in this embodiment, the gland 30 is connected to the top end of the cylinder cover 220 by a screw, the radial section outer diameter of the gland 30 is larger than the radial section outer diameter of the cylinder cover 220, and a through hole for the piston rod 230 to pass through is formed in the center of the gland 30.
Referring to fig. 3 and 5, the lock nut device 20 is movably sleeved on the hydraulic cylinder 200, and includes a body 21 having a cylindrical hollow portion, a first inner boss 22 disposed at one end of the body 21, and a second inner boss 23 disposed at the other end of the body 21. The radial cross-sectional diameter of the cylindrical hollow portion of the body 21 is identical to the radial cross-sectional outer diameter of the gland 30, the radial cross-sectional inner diameters of the first inner boss 22 and the second inner boss 23 are both smaller than the radial cross-sectional outer diameter of the gland 30, and the second inner boss 23 is provided with an internal thread 231 that mates with the external thread 11 of the externally threaded stage 10, specifically, the internal thread 231 is a normal thread. By matching the internal thread 231 and the external thread 11, the locking of the lock nut device 20 to the piston rod 230 is achieved, and since the inner diameter of the first inner boss 22 of the lock nut device 20 is smaller than the radial section outer diameter of the gland 30, the first inner boss 22 is clamped against the gland 30 when the lock nut device 20 locks the piston rod 230, and limiting of the gland 30 to the lock nut is achieved. Specifically, in the present embodiment, the axial cross-sectional width of the externally threaded stage 10 is larger than the axial cross-sectional width of the second inner boss 23.
Further, the outer surface of the body 21 of the lock nut device 20 is provided with at least one grip 211 for assisting in rotating the body 21 when locking the piston rod 230 using the lock nut device 20. Specifically, in the present embodiment, the number of the gripping hands 211 is four, and the four gripping hands 211 are sequentially and uniformly distributed on the outer surface of the body 21, so that the rotation of the lock nut device 20 can be more conveniently operated. It will be appreciated that the grip 211 may be provided according to the actual use requirements and the size of the body 21.
Since the lock nut device 20 is blocked by a part of the outer surface of the cylinder 210 during the process of moving to the left, the lock nut device 20 is further provided with a avoiding groove 212 for avoiding the outer surface of the cylinder 210.
The application also provides a hydraulic cylinder 200, which comprises a cylinder barrel 210, a cylinder cover 220 arranged at the end part of the cylinder barrel 210 and used for closing the cylinder barrel 210, a piston rod assembly arranged inside the cylinder barrel 210 and penetrating the cylinder cover 220, and the piston rod locking mechanism.
The working principle of the piston rod locking mechanism is as follows:
When the hydraulic cylinder 200 works, the piston rod 230 needs to stretch out and draw back, the lock nut device 20 moves towards the left side in the horizontal direction, at this time, the second inner boss 23 of the lock nut device 20 is clamped against the gland 30, and the inner thread 231 of the lock nut device 20 and the outer thread table 10 of the piston rod 230 are in a staggered state; since the external thread table 10 is provided at the front end of the protruding portion of the piston rod 230, the lock nut device 20 does not affect the free expansion and contraction of the piston rod 230;
when the hydraulic cylinder 200 is in the supporting state, the piston rod 230 needs to be locked, the lock nut device 20 is moved to the right side towards the left side of the horizontal direction to the external thread platform 10 of the piston rod 230, the connection between the lock nut device 20 and the piston rod 230 is realized through the engagement of the internal thread 231 and the external thread 11, and as the piston rod 230 extends out, the first inner boss 22 of the lock nut device 20 is blocked against the pressing cover 30, so that the lock nut device 20 locks the piston rod 230.
The utility model provides a piston rod locking mechanism and a hydraulic cylinder 200, wherein the piston rod locking mechanism is arranged on the hydraulic cylinder 200. The piston rod locking mechanism comprises an external thread table 10 arranged at the front end of the extending part of a piston rod 230 of a hydraulic cylinder 200, a locking nut device 20 movably sleeved on a cylinder barrel 210 of the hydraulic cylinder 200, and a gland 30 arranged at the top end of a cylinder cover 220 of the hydraulic cylinder 200 and used for limiting the locking nut device 20, wherein the radial section outer diameter of the gland 30 is larger than that of the cylinder cover 220, the locking nut device 20 is provided with an internal thread 231 matched with the external thread table 10, the internal thread 231 of the locking nut device 20 is in threaded engagement connection with the external thread table 10 arranged on the piston rod 230, and the movement range of the locking nut device 20 is limited through the gland 30, so that the piston rod 230 of the hydraulic cylinder 200 in a supporting state is locked and fixed by the locking nut device 20. The utility model is suitable for being used in the hydraulic cylinder industry in the new product installation test and the batch production, and the trapezoidal thread can be changed into a conventional thread structure by changing the structure of the locking nut device 20, so that the problems of high material cost, high processing cost and poor self-locking capability of the trapezoidal thread are solved.
While the utility model has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present utility model may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. The utility model provides a piston rod locking mechanism, its setting is on hydraulic cylinder, its characterized in that, including setting up the external screw thread platform at hydraulic cylinder's piston rod extension front end, movably cover establish the lock nut device on hydraulic cylinder's cylinder, and set up at hydraulic cylinder's cylinder cap top be used for right the spacing gland of lock nut device, the radial cross-section external diameter of gland is greater than the radial cross-section external diameter of cylinder cap, lock nut device offer with external screw thread platform complex internal screw thread to carry out the locking to the hydraulic cylinder piston rod under the support state and fix.
2. The piston rod locking mechanism of claim 1 wherein said lock nut means comprises a body having a cylindrical hollow, a first inner boss disposed at one end of said body and a second inner boss disposed at the other end of said body; the radial section inner diameters of the first inner boss and the second inner boss are smaller than the radial section outer diameter of the gland, so that the first inner boss is clamped against the gland when the lock nut device locks the piston rod; the internal thread is arranged on the second internal boss.
3. The piston rod locking mechanism of claim 2 wherein the radial cross-sectional outer diameter of the gland and the radial cross-sectional diameter of the cylindrical hollow of the body are identical.
4. A piston rod locking mechanism according to claim 2, wherein the outer surface of the body is provided with at least one grip.
5. The piston rod locking mechanism of claim 4, wherein the number of the grippers is four, and the four grippers are sequentially and uniformly distributed on the outer surface of the body.
6. The piston rod locking mechanism of claim 2 wherein the axial cross-sectional width of the externally threaded land is greater than the axial cross-sectional width of the second internal boss.
7. The piston rod locking mechanism of claim 1 wherein the externally threaded land is welded to the piston rod.
8. The piston rod locking mechanism of claim 1 wherein said external threads and said internal threads are both plain threads.
9. The piston rod locking mechanism of claim 1 wherein the lock nut means is further provided with a relief groove for relieving an outer surface member of the cylinder.
10. A hydraulic cylinder comprising a cylinder barrel, a cylinder cover arranged at the end of the cylinder barrel for closing the cylinder barrel, a piston rod assembly arranged inside the cylinder barrel and penetrating the cylinder cover, and a piston rod locking mechanism according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322478477.8U CN220890653U (en) | 2023-09-13 | 2023-09-13 | Piston rod locking mechanism and hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322478477.8U CN220890653U (en) | 2023-09-13 | 2023-09-13 | Piston rod locking mechanism and hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220890653U true CN220890653U (en) | 2024-05-03 |
Family
ID=90867831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322478477.8U Active CN220890653U (en) | 2023-09-13 | 2023-09-13 | Piston rod locking mechanism and hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220890653U (en) |
-
2023
- 2023-09-13 CN CN202322478477.8U patent/CN220890653U/en active Active
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