CN216997566U - Piston assembly and hydraulic jack - Google Patents
Piston assembly and hydraulic jack Download PDFInfo
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- CN216997566U CN216997566U CN202122944999.3U CN202122944999U CN216997566U CN 216997566 U CN216997566 U CN 216997566U CN 202122944999 U CN202122944999 U CN 202122944999U CN 216997566 U CN216997566 U CN 216997566U
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Abstract
The application discloses piston assembly and hydraulic jack, piston assembly includes the piston pipe, piston switch and hydraulic stem, the one end and the piston switch of piston pipe are connected, the hydraulic stem sets up in the piston pipe, the hydraulic stem includes piston rod and piston cap, the piston cap divides the piston pipe into upper chamber and lower chamber, the hydraulic stem still includes first trompil, second trompil and mechanical safety valve, set up first trompil on the piston cap, set up the second trompil on the piston rod, through first trompil and second trompil intercommunication upper chamber and lower chamber, mechanical safety valve sets up in the passageway between first trompil and second trompil, when the pressure of hydraulic district and the pressure difference value of lower chamber surpassed rated value, mechanical safety valve switches on upper chamber and lower chamber. Through the design, the device provided with the piston assembly is effectively prevented from exceeding the rated load bearing when in use, and the structure of the device is damaged by the continuous use of the device.
Description
Technical Field
The application relates to the field of mechanical engineering, in particular to a piston assembly and a hydraulic jack.
Background
The jack is the important equipment of auto repair, when the car need change the tire, just need to use hydraulic jack to rise the car, resets after having changed the tire.
As the hydraulic jack is used as a lifting device, rated bearing exists, and the rated bearing of different hydraulic jacks is different, whether the weight of a heavy object exceeds the rated bearing of the hydraulic jack is often unclear in the using process, and once the weight of the heavy object exceeds the rated bearing of the hydraulic jack, the structure of the hydraulic jack can be damaged, and a user can be injured. Therefore, how to prevent the hydraulic jack from being continuously used without damaging the structure of the hydraulic jack when the weight of the heavy object exceeds the rated load bearing of the hydraulic jack becomes a technical problem to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
It is an object of the present application to provide a piston assembly and hydraulic jack that effectively prevents the device equipped with the piston assembly from exceeding its rated load bearing when in use, causing damage to its structure and injury to the user as the device continues to be used.
The application discloses a piston assembly, which comprises a piston tube, a piston switch and a hydraulic rod, wherein one end of the piston tube is connected with the piston switch; the hydraulic rod is arranged in the piston tube and performs lifting motion in the piston tube; the hydraulic rod comprises a piston rod and a piston cap, the diameter of the piston rod is smaller than that of the piston cap, one end of the piston rod is fixedly connected with the piston cap, and the piston cap is arranged between the piston switch and the piston rod; the piston cap is arranged in the piston tube, the piston tube is divided into an upper chamber and a lower chamber, and when the piston cap moves along the piston tube towards the direction of the upper chamber, hydraulic oil in an oil storage area outside the piston tube is pumped into the lower chamber; discharging hydraulic oil in a lower chamber to a hydraulic area outside the piston tube when the piston cap moves in a direction of the piston tube toward the lower chamber; the hydraulic rod further comprises a first opening and a second opening, the first opening is formed in one end, far away from the piston rod, of the piston cap, the second opening is formed in the side face of the piston rod, and the first opening and the second opening are communicated to form a channel to conduct the upper chamber and the lower chamber; the hydraulic rod further comprises a mechanical safety valve, the mechanical safety valve is arranged in a channel between the first opening and the second opening, when the difference between the pressure of the hydraulic area and the pressure of the lower chamber is smaller than a rated value, the mechanical safety valve is closed, and the upper chamber and the lower chamber are not communicated; when the pressure difference value between the hydraulic area and the lower chamber exceeds a rated value, the mechanical safety valve is caused to be opened, and the upper chamber and the lower chamber are communicated.
Optionally, the mechanical safety valve includes a valve, an expansion piece and a limiting piece, the limiting piece is fixedly connected to the piston rod, the valve is disposed at the first opening, the expansion piece is disposed between the valve and the limiting piece, one end of the expansion piece abuts against the valve, and the other end of the expansion piece abuts against the limiting piece.
Optionally, the valve is disposed corresponding to the first opening and the second opening at the same time, and when a difference between the pressure of the hydraulic area and the pressure of the lower chamber is smaller than a rated value, the valve seals the first opening and the second opening at the same time.
Optionally, the piston rod includes a first rod body and a second rod body, one end of the first rod body is connected with the piston cap, the other end of the first rod body is in threaded connection with the second rod body, and two oppositely-arranged notches are formed in the outer surface of the second rod body; the first rod body is hollow, and the valve, the telescopic piece and the limiting piece are arranged in the first rod body; the second hole is formed in the first rod body and communicated with the first hole.
Optionally, the valve is a sphere, and the valve is attached to the inner surface of the first rod body.
Optionally, the limiting member is in threaded connection with the inner wall of the first rod body.
Optionally, the piston rod further includes a third opening, and the third opening and the second opening form a through hole penetrating through the piston rod.
Optionally, a piston cap groove is formed in one surface, attached to the piston pipe, of the piston cap, the piston cap groove is formed in an annular shape, a piston cap sealing ring is arranged in the piston cap groove, and the piston cap sealing ring is attached to the inner wall of the piston pipe.
Optionally, a piston tube hole is formed in the piston tube, the piston tube hole is located in the upper chamber, and the piston tube hole conducts the upper chamber and the oil storage area.
The application also discloses a hydraulic jack, hydraulic jack includes collet, oil cylinder, shell, cushion cap, sealed lid, handle and any one of the above-mentioned piston assembly, the one end and the collet of oil cylinder are connected, piston assembly sets up in oil cylinder, divides oil storage area and hydraulic pressure district into with oil cylinder, the shell cover is located on the oil cylinder, with oil cylinder sliding connection, piston assembly's one end is passed through sealed lid with the shell is connected, the handle set up in sealed covering, connect the hydraulic stem, control the hydraulic stem is in the motion in the piston tube along length direction, when the hydraulic stem moves towards sealed lid direction, hydraulic oil in the oil storage area gets into in the piston tube, the hydraulic stem pipe towards during piston switch's direction motion, hydraulic oil in the piston tube gets into in the hydraulic area, the piston assembly drives the shell to move away from the bottom support through the sealing cover.
For the tradition does not set up mechanical safety valve's piston assembly, this application sets up mechanical safety valve in piston assembly, but also sets up mechanical safety valve in the inside of hydraulic stem, can not cause the influence to other structures of piston assembly. If the traditional product needs to be upgraded, only the hydraulic rod with the mechanical safety valve needs to be replaced; after the mechanical safety valve is additionally arranged on the device, the problems that the load is more than the rated load when the device is used, the device is continuously used to damage the structure of the device and hurt a user can be effectively prevented; according to actual conditions, for example, when the piston assembly structure after being used for a long time is tired and cannot bear rated bearing set when leaving a factory, the corresponding mechanical safety valve can be directly replaced.
Drawings
FIG. 1 is a schematic illustration of a hydraulic jack according to an embodiment of the present application;
FIG. 2 is a cross-sectional view of a hydraulic jack according to an embodiment of the present application;
FIG. 3 is an exploded view of a hydraulic jack according to an embodiment of the present application;
FIG. 4 is an enlarged, fragmentary schematic view of a hydraulic ram of an embodiment of the present application;
FIG. 5 is an internal block diagram of a hydraulic ram of an embodiment of the present application where a mechanical relief valve is provided;
fig. 6 is an exploded view of a piston assembly of an embodiment of the present application.
10, a hydraulic jack; 100. a hydraulic area; 200. an oil storage area; 300. a piston tube; 310. a piston tube bore; 320. an upper chamber; 330. a lower chamber; 400. a hydraulic lever; 410. a piston rod; 411. a first rod body; 412. a second rod body; 413. cutting; 420. a piston cap; 421. a piston cap recess; 422. a first opening; 423. a second opening; 424. a third opening; 500. a piston switch; 600. a mechanical safety valve; 610. a valve; 620. a telescoping member; 630. a stopper; 20. a sealing cover; 30. an oil cylinder; 40. a housing; 50. a bearing platform; 60. a handle; 70. a bottom support; 80. a piston assembly.
Detailed Description
The present application is described in detail below with reference to the figures and alternative embodiments.
Fig. 1 is a schematic view of a hydraulic jack according to an embodiment of the present application, fig. 2 is a vertical sectional view of a hydraulic jack according to an embodiment of the present application, fig. 3 is an exploded view of a hydraulic jack according to an embodiment of the present application, fig. 4 is a partially enlarged schematic view of a hydraulic rod according to an embodiment of the present application, and as shown in fig. 1 to 4, a hydraulic jack 10 according to an embodiment of the present application is disclosed, the hydraulic jack 10 including a piston assembly 80, a shoe 70, an oil cylinder 30, a housing 40, a cap 50, a sealing cover 20, a handle 60, one end of the oil cylinder 30 being connected to the shoe 70, the piston assembly 80 including a piston tube 300, a piston switch 500, and a hydraulic rod 400, the hydraulic rod 400 being connected to the handle 60, the piston tube 300 being connected to the sealing cover 20, the piston switch 500 being disposed in the oil cylinder 30, will oil cylinder 30 divides into oil reservoir 200 and hydraulic pressure district 100, shell 40 cover is located on oil cylinder 30, and with oil cylinder 30 sliding connection, the one end of piston assembly 80 is passed through sealed lid 20 with shell 40 is connected, handle 60 set up in sealed lid 20 is last, and connect hydraulic stem 400, and control hydraulic stem 400 moves in piston tube 300 along length direction, works as hydraulic stem 400 along when piston tube 300 moves towards sealed lid 20 direction, hydraulic oil in the oil reservoir 200 gets into in the piston tube 300, works as hydraulic stem 300 along piston tube 300 moves towards piston switch 500's direction, hydraulic oil in the piston tube 300 gets into in the hydraulic pressure district 100, piston assembly 80 drives shell 40 through sealed lid 20 and moves towards keeping away from the direction of collet 70.
Wherein one end of the piston tube 300 is connected to the piston switch 500; the hydraulic rod 400 is disposed in the piston tube 300, and performs a lifting motion in the piston tube 300; the hydraulic rod 400 comprises a piston rod 410 and a piston cap 420, the diameter of the piston rod 410 is smaller than that of the piston cap 420, one end of the piston rod 410 is fixedly connected with the piston cap 420, and the piston cap 420 is arranged between the piston switch 500 and the piston rod 410; the piston cap 420 is disposed in the piston tube 300, and divides the piston tube 300 into an upper chamber 320 and a lower chamber 330, and when the piston cap 420 moves along the piston tube 300 toward the upper chamber 320, the hydraulic oil in the oil storage region 200 outside the piston tube 300 is pumped into the lower chamber 330; when the piston cap 420 moves in the direction of the piston tube 300 toward the lower chamber 330, hydraulic oil in the lower chamber 330 is discharged to the hydraulic zone 100 outside the piston tube 300.
The hydraulic rod 400 further includes a first opening 422 and a second opening 423, the first opening 422 is disposed at an end of the piston cap 420 far away from the piston rod 410, the second opening 423 is disposed at a side of the piston rod 410, and the first opening 422 and the second opening 423 are communicated to form a channel for communicating the upper chamber 320 with the lower chamber 330; the hydraulic rod 400 further includes a mechanical safety valve 600, the mechanical safety valve 600 is disposed in a passage between the first opening 422 and the second opening 423, when a difference between the pressure of the hydraulic region 100 and the pressure of the lower chamber 330 is smaller than a rated value, the mechanical safety valve 600 is closed, and the upper chamber 320 and the lower chamber 330 are not conducted; when the pressure difference between the hydraulic area 100 and the lower chamber 330 exceeds a rated value, the mechanical safety valve 600 is opened to conduct the upper chamber 320 and the lower chamber 330.
Since the hydraulic jack 10 is provided with the mechanical safety valve 600 in the hydraulic rod 400, when the pressure borne by the hydraulic jack 10 exceeds the rated load, the mechanical safety valve 600 is opened to conduct the first opening 422 and the second opening 423, and no matter how the hydraulic rod 400 reciprocates, the hydraulic oil in the lower chamber 330 cannot be pressed into the hydraulic area 100. At the moment, the hydraulic jack 10 is in an inoperative state, and the hydraulic oil is continuously pressed into the hydraulic area 100 even if the bearing capacity range of the hydraulic jack 10 is exceeded, so that the structure of the hydraulic jack 10 is not damaged and a user is not injured; in addition, the hydraulic jack 10 is provided with the mechanical safety valve 600 in the hydraulic rod 400, so when the conventional hydraulic jack 10 does not have the mechanical safety valve 600 and needs to be upgraded, the hydraulic rod 400 with the mechanical safety valve 600 can be directly replaced without changing other structures of the jack. It is also possible that, depending on the actual situation, for example, the hydraulic jack 10 will be fatigued after long-term use of the mechanical structure, and the bearable weight will be lower than the rated load when leaving the factory, then the hydraulic rod 400 provided with the mechanical safety valve 600 may be replaced, and the piston assembly may be provided in other hydraulic equipment than the hydraulic jack.
As shown in fig. 5, the mechanical safety valve 600 includes a valve 610, an expansion member 620, and a limiting member 630, the limiting member 630 is fixedly connected to the piston rod 410, the valve 610 is disposed at the first opening 422, the expansion member 620 is disposed between the valve 610 and the limiting member 630, and one end of the expansion member 620 abuts against the valve 610 and the other end abuts against the limiting member 630. Specifically, the mechanical safety valve 600 of the present application adopts a purely mechanical structure, does not need a pressure sensor, and has a simpler structure, and when the weight of an object supported by the mechanical safety valve exceeds the rated load bearing capacity of the hydraulic jack 10, even if the hydraulic jack 10 is forcibly pressed down, the hydraulic oil in the lower chamber 330 cannot be pressed into the hydraulic area 100.
Mainly, when the hydraulic rod 400 is moved downward due to the handle 60 of the hydraulic jack 10 being pressed down by the excessive oil pressure of the hydraulic oil in the hydraulic area 100, the hydraulic oil in the lower chamber 330, through the first opening 422, causes the valve 610 to move upward, compressing the telescoping member 620, the length of the telescopic member 620 is shortened, the valve 610 is opened, the first opening 422 and the second opening 423 communicate the upper chamber 320 and the lower chamber 330, the hydraulic oil in the lower chamber 330 enters the upper chamber 320, without entering the hydraulic area 100, the hydraulic jack 10 does not continue to lift the weight regardless of the movement of the hydraulic rod 400, if the safety valve is not added, when the weight of the heavy object exceeds the rated load-bearing capacity of the hydraulic jack 10, the hydraulic rod 400 is immovable, and when it is forcibly pressed down, the hydraulic rod 300 is likely to be damaged.
Wherein the valve 610 is disposed corresponding to the first opening 422 and the second opening 423 at the same time, and when the difference between the pressure of the hydraulic area 100 and the pressure of the lower chamber 330 is smaller than a rated value, the valve 610 seals the first opening 422 and the second opening 423 at the same time. Since the first opening 422 is in communication with the lower chamber 330, the second opening 423 corresponds to the upper chamber 320, when the load of the hydraulic jack 10 exceeds the rated load, the valve 610 is opened, that is, the valve 610 presses the telescopic member 620 upward, the first opening 422 and the second opening 423 are communicated, when the load of the hydraulic jack 10 is less than the rated load, the valve 610 is closed, simultaneously blocking the first and second openings 422 and 423, simultaneously sealing the first and second openings 422 and 423 through the valve 610, hydraulic oil can be prevented from entering between the limiting member 630 and the valve 610 through the second opening 423 to influence the operation of the valve 610, and the hydraulic oil in the upper chamber 320 and the lower chamber 330 is prevented from entering between the valve 610 and the limiting member 630 to influence the normal contraction of the expansion member 620.
The valve 610 is a sphere, and the valve 610 is attached to the inner surface of the first rod 411. Of course, the valve 610 may have other configurations, such as a cylinder or a cone, but it should be noted that the valve 610, regardless of its shape, must seal either the first opening 422 or the second opening 423 to prevent communication between the first opening 422 and the second opening 423 when the hydraulic jack 10 is not under a load exceeding the rated load.
The limiting member 630 is in threaded connection with the inner wall of the first rod 411. Through screw-thread fit, the up-and-down movement of the limiting member 630 relative to the first rod 411 is realized, the purpose of adjusting the initial telescopic amount of the telescopic member 620 and further adjusting the rated load bearing amount of the hydraulic jack 10 is achieved, when the limiting member 630 moves towards the direction far away from the telescopic member 620, the initial length of the limiting member 630 is lengthened, the rated load bearing amount of the hydraulic jack 10 is reduced, and when the limiting member 630 moves towards the direction close to the telescopic member 620, the initial length of the telescopic member 620 is shortened, and the rated load bearing amount of the jack is increased.
The piston rod 410 further includes a third opening 424, and the third opening 424 and the second opening 423 form a through hole penetrating the piston rod 410. When hydraulic jack 10 bearing surpasss rated bearing, valve 610 upwards extrudees extensible member 620, first trompil 422, second trompil 423 and third trompil 424 intercommunication, hydraulic oil velocity of flow is very fast this moment, and the impact force is very big, through the position that second trompil 423 corresponds sets up third trompil 424, second trompil 423 with third trompil 424 forms the through-hole, can equalize the impact force that piston tube 300 received, can also balance hydraulic stem 400, avoid producing the extrusion between hydraulic stem 400 and the piston tube 300, destroy hydraulic jack 10.
The piston cap 420 is provided with a piston cap groove 421 with the one side that the piston pipe 300 is pasted, piston cap groove 421 is the annular setting, and is provided with piston cap 420 sealing washer in, the piston cap 420 sealing washer with the inner wall of piston pipe 300 pastes mutually. The piston cap 420 is configured with the piston cap 420 sealing ring in the piston cap groove 421, the piston cap 420 sealing ring is attached to the inner wall of the piston tube 300, so as to divide the piston tube 300 into the upper chamber 320 and the lower chamber 330, thereby effectively preventing the piston cap 420 from wearing in the piston tube 300, and preventing the upper chamber 320 and the lower chamber 330 from being communicated through the gap between the piston cap 420 and the piston tube 300.
As shown in fig. 6, the piston rod 410 includes a first rod 411 and a second rod 412, one end of the first rod 411 is connected to the piston cap 420, the other end of the first rod 411 is connected to the second rod 412 by a screw, and two opposite notches 413 are formed on the outer surface of the second rod 412; the first rod 411 is hollow, and the valve 610, the telescopic member 620 and the limiting member 630 are disposed in the first rod 411; the second opening 423 is disposed on the first rod 411 and is connected to the first opening 422. The piston rod 410 comprises a first rod body 411 and a second rod body 412, wherein the first rod body 411 can be solid so as to enhance structural strength, the mechanical safety valve 600 is installed in the first rod body 411 and is convenient to disassemble and assemble, and the second rod body 412 is provided with two oppositely-arranged notches 413 for installation of the first rod body 411 and stress of an installation tool so as to reduce installation difficulty.
The piston tube 300 is provided with a piston tube hole 310, the piston tube hole 310 is located in the upper chamber 320, and the piston tube hole 310 communicates the upper chamber 320 with the oil storage area 200. Specifically, when hydraulic jack 10 bearing exceeded the rated bearing, valve 610 upwards extrudees extensible member 620, first trompil 422 with second trompil 423 switches on, the hydraulic oil in lower chamber 330 gets into in going up the cavity 320, this moment go up cavity 320 with cavity 330 all has hydraulic oil down, works as hydraulic stem 400 to when going up cavity 320 and removing, because piston tube hole 310 switches on the oil storage area 200, just can with the hydraulic oil in the upper chamber 320 passes through piston tube hole 310 is arranged in the oil storage area 200.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A piston assembly, comprising:
a piston tube;
the piston switch is connected with one end of the piston pipe;
the hydraulic rod is arranged in the piston pipe and performs lifting motion in the piston pipe;
the hydraulic rod comprises a piston rod and a piston cap, the diameter of the piston rod is smaller than that of the piston cap, one end of the piston rod is fixedly connected with the piston cap, and the piston cap is arranged between the piston switch and the piston rod; the piston cap is arranged in the piston tube, the piston tube is divided into an upper chamber and a lower chamber, and when the piston cap moves along the piston tube towards the direction of the upper chamber, hydraulic oil in an oil storage area outside the piston tube is pumped into the lower chamber; discharging hydraulic oil in a lower chamber to a hydraulic area outside the piston tube when the piston cap moves in a direction toward the lower chamber along the piston tube;
the hydraulic rod further comprises a first opening and a second opening, the first opening is formed in one end, far away from the piston rod, of the piston cap, the second opening is formed in the side face of the piston rod, and the first opening and the second opening are communicated to form a channel to conduct the upper chamber and the lower chamber;
the hydraulic rod further comprises a mechanical safety valve, the mechanical safety valve is arranged in a channel between the first opening hole and the second opening hole, when the difference between the pressure of the hydraulic area and the pressure of the lower chamber is smaller than a rated value, the mechanical safety valve is closed, and the upper chamber and the lower chamber are not communicated; when the pressure difference value between the hydraulic area and the lower chamber exceeds a rated value, the mechanical safety valve is opened to conduct the upper chamber and the lower chamber.
2. The piston assembly of claim 1, wherein the mechanical safety valve includes a valve, an expansion member, and a stopper, the stopper is fixedly connected to the piston rod, the valve is disposed at the first opening, the expansion member is disposed between the valve and the stopper, and one end of the expansion member abuts against the valve and the other end abuts against the stopper.
3. The piston assembly of claim 2 wherein said valve is positioned to simultaneously correspond to said first opening and said second opening, said valve simultaneously sealing said first opening and said second opening when the difference between the pressure of said hydraulic region and the pressure of said lower chamber is less than a nominal value.
4. The piston assembly of claim 2, wherein the piston rod comprises a first rod body and a second rod body, one end of the first rod body is connected with the piston cap, the other end of the first rod body is in threaded connection with the second rod body, and two oppositely arranged notches are formed in the outer surface of the second rod body;
the first rod body is hollow, and the valve, the telescopic piece and the limiting piece are arranged in the first rod body; the second opening is formed in the first rod body and communicated with the first opening.
5. The piston assembly of claim 4, wherein the valve is a ball and the valve abuts an inner surface of the first rod.
6. The piston assembly of claim 4, wherein the retainer is threadably coupled to an inner wall of the first rod body.
7. The piston assembly of claim 1 wherein said piston rod includes a third opening, said third opening and said second opening forming a through bore extending through said piston rod.
8. The piston assembly of claim 1, wherein a piston cap groove is formed in a surface of the piston cap, which is adjacent to the piston tube, the piston cap groove is annular, and a piston cap seal ring is arranged in the piston cap groove and is adjacent to an inner wall of the piston tube.
9. The piston assembly of claim 1, wherein said piston tube includes a piston tube bore therein, said piston tube bore being located in said upper chamber, said piston tube bore communicating between said upper chamber and said reservoir.
10. A hydraulic jack comprising a piston assembly according to any one of claims 1 to 9, a shoe, a cylinder, a housing, a platform, a seal cap and a handle, the cylinder being connected at one end to the shoe, the piston assembly being disposed in the cylinder to divide the cylinder into an oil reservoir and a hydraulic region; the outer shell is sleeved on the oil cylinder and is in sliding connection with the oil cylinder, and one end of the piston assembly is connected with the outer shell through the sealing cover; the handle is arranged on the sealing cover, is connected with the hydraulic rod and controls the hydraulic rod to move in the piston tube along the length direction;
when the piston pipe moves towards the direction of the sealing cover, hydraulic oil in the oil storage area enters the piston pipe; when the piston tube moves towards the piston switch, hydraulic oil in the piston tube enters the hydraulic area, and the piston assembly drives the shell to move towards the direction far away from the bottom support through the sealing cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122944999.3U CN216997566U (en) | 2021-11-26 | 2021-11-26 | Piston assembly and hydraulic jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122944999.3U CN216997566U (en) | 2021-11-26 | 2021-11-26 | Piston assembly and hydraulic jack |
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| Publication Number | Publication Date |
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| CN216997566U true CN216997566U (en) | 2022-07-19 |
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| CN202122944999.3U Active CN216997566U (en) | 2021-11-26 | 2021-11-26 | Piston assembly and hydraulic jack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114084858A (en) * | 2021-11-26 | 2022-02-25 | 深圳扬宁汽车配件有限公司 | Piston assembly and hydraulic jack |
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2021
- 2021-11-26 CN CN202122944999.3U patent/CN216997566U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114084858A (en) * | 2021-11-26 | 2022-02-25 | 深圳扬宁汽车配件有限公司 | Piston assembly and hydraulic jack |
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