CN206072013U - A kind of clearance seal formula piston structure without sealing member - Google Patents
A kind of clearance seal formula piston structure without sealing member Download PDFInfo
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- CN206072013U CN206072013U CN201621033167.9U CN201621033167U CN206072013U CN 206072013 U CN206072013 U CN 206072013U CN 201621033167 U CN201621033167 U CN 201621033167U CN 206072013 U CN206072013 U CN 206072013U
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- piston
- sealing member
- clearance seal
- seal formula
- cylinder barrel
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Abstract
This utility model is related to a kind of clearance seal formula piston structure without sealing member, including the piston of piston rod, fixed cover outside piston rod and the cylinder barrel coordinated with piston outer ring surface gap；The side face of piston ring offers annular and starts groove, and the startup groove is connected by multiple fenestras with piston outer ring surface.Due to the setting for starting groove with play fenestra, when feeding hydraulic oil to the arbitrary cavity in piston both sides, hydraulic oil is entered and is started in groove, then form oil film in the mating surface of piston and cylinder barrel by playing fenestra rapidly, so as to play a part of lubrication, scuffing and abrasion of the piston with the mating surface of cylinder barrel in relative movement are reduced.The clearance seal formula piston structure without sealing member has the advantages that the suitability is wide, reliability is high, long service life.
Description
Technical field
This utility model is related to a kind of parts of hydraulic jack, more particularly to a kind of clearance seal formula without sealing member is lived
Plug structure.
Background technology
Piston is the important composition part of hydraulic jack, and which is sheathed between piston rod and cylinder barrel.General piston structure
It is that non-metallic seal (such as rubber) is set on the outer ring surface coordinated with inner wall of cylinder in piston to prevent in the cavity of piston both sides
Hydraulic oil intercommunication, so as to ensure pressure differential.But some occasions (such as high temperature, high pressure, altofrequency vibrations) can not use nonmetallic
The sealing member of material, but by piston and the tight fit of inner wall of cylinder, piston is ensured with gap minimum therebetween
The pressure differential of both sides cavity, i.e., using the clearance seal formula piston structure without sealing member, which is generally used for the liquid of speed
In cylinder pressure.
However, the above-mentioned clearance seal formula piston structure without sealing member is poor due to lubricant effect, it is impossible to be effectively prevented from living
Plug and scuffing and abrasion of the cylinder barrel mating surface in relative movement so that piston is gradually increased with the mating surface gap of cylinder barrel
Greatly, so as to build-up of pressure loss and hydraulic oil amount of leakage are big, reduce the service life of hydraulic jack.
Utility model content
The purpose of this utility model is for the shortcoming and defect for solving above-mentioned prior art, there is provided a kind of suitability is wide,
Reliability is high, the clearance seal formula piston structure of long service life.
This utility model is achieved through the following technical solutions：A kind of clearance seal formula piston structure without sealing member,
Piston and the cylinder barrel coordinated with piston outer ring surface gap including piston rod, fixed cover outside piston rod；The piston two
End face offers annular and starts groove, and the startup groove is connected by multiple fenestras with piston outer ring surface.Due to start groove with
The setting of fenestra is played, and when hydraulic oil is fed to the arbitrary cavity in piston both sides, hydraulic oil is entered and started in groove, then by playing fenestra
It is rapid to form oil film in mating surface of the piston with cylinder barrel, so as to play a part of lubrication, reduce the mating surface of piston and cylinder barrel
Scuffing and abrasion in relative movement.
Further, multiple annular sewage reservoir troughs are offered on the piston outer ring surface.The setting of annular sewage reservoir trough, on the one hand
The solid particle that greasy dirt or abrasion are produced can be accommodated；On the other hand oil that can be to be formed in mating surface of the stable plunger with cylinder barrel
Film, it is ensured that the gap uniformity between piston outer ring surface and cylinder barrel inner surface is stable, so as to ensure the pressure differential of piston both sides cavity.
Preferably, the plurality of fenestra is circumferentially uniformly distributed along piston.This is provided with beneficial to rapid in piston and cylinder barrel
Mating surface on form uniform and stable oil film.The density degree for playing fenestra arrangement is relevant with the viscosity of working media, and work is situated between
The viscosity of matter is higher, and a fenestra is arranged to more intensive；Viscosity is lower, and a fenestra is arranged to more sparse.
Preferably, the plurality of annular sewage reservoir trough is axially uniformly distributed along piston.The setting advantageously ensures that piston outer shroud
Gap uniformity between face and cylinder barrel inner surface is stable.The quantity of sewage reservoir trough is directly proportional to the length of piston, the density of its arrangement
Degree is relevant with the viscosity of working media, and the viscosity of working media is higher, and sewage reservoir trough is arranged to more intensive；Viscosity is lower, hides dirty
Groove is arranged to more sparse.
Further, the piston two ends are equipped with outwardly buffer plunger at piston rod.Due to gap it is close
Envelope formula piston structure is commonly used in the hydraulic jack of speed, and arranging buffer plunger at piston two ends can make piston movement
Stably slow down during to cylinder barrel end face, play good buffering effect.
Compared to prior art, a kind of clearance seal formula piston structure without sealing member of the present utility model, by work
The improvement of plug structure, plays effective lubrication to the mating surface of piston and cylinder barrel, even if the fit clearance of piston and cylinder barrel
Do not result in mating surface to scratch and wear and tear in the case of very little yet, so as to reduce the pressure loss between the cavity at piston two ends and
Hydraulic oil amount of leakage.The clearance seal formula piston structure without sealing member has that the suitability is wide, reliability is high, long service life etc.
Advantage.
In order to more fully understand and implement, this utility model is described below in conjunction with the accompanying drawings in detail.
Description of the drawings
Fig. 1 is the partial cutaway schematic of the clearance seal formula piston structure without sealing member of the present utility model.
Specific embodiment
Fig. 1 is referred to, which is the profile of the clearance seal formula piston structure without sealing member of the present utility model.This practicality
The new clearance seal formula piston structure without sealing member, including piston of the piston rod 10, fixed cover outside piston rod 10
20 and with 20 outer ring surface gap of piston coordinate cylinder barrel 30；Piston 20 when both sides cavity A chambers or B chambers feed hydraulic oil to the left or
Move right.
Specifically, 20 both ends of the surface of the piston offer annular startup groove 21, and the startup groove 21 and 20 outer shroud of piston
Face is connected by multiple fenestras 22.When the arbitrary cavity in 20 both sides of piston feeds hydraulic oil, hydraulic oil is entered and is started in groove 21, so
By rising, fenestra 22 is rapid to form oil film in the mating surface of piston 20 and cylinder barrel 30 afterwards, so as to play a part of lubrication, reduces
Scuffing and abrasion of the mating surface of piston 20 and cylinder barrel 30 in relative movement.
Further, multiple annular sewage reservoir troughs 23 are offered on 20 outer ring surface of the piston.23 1 side of the annular sewage reservoir trough
Face can accommodate the solid particle that greasy dirt or abrasion are produced, on the other hand can be with shape in mating surface of the stable plunger 20 with cylinder barrel 30
Into oil film, it is ensured that gap uniformity between 30 inner surface of 20 outer ring surface of piston and cylinder barrel is stable, so as to ensure 20 both sides of piston
The pressure differential of cavity (A chambers and B chambers).
Further, 20 two ends of the piston are equipped with outwardly buffer plunger 24 at piston rod 10, and two delay
Rush 24 symmetric design of plunger.As clearance seal formula piston structure is commonly used in the hydraulic jack of speed, in piston
20 two ends arrange buffer plunger 24 can make piston 20 stably slow down when moving to cylinder barrel end face, play good buffering effect,
So as to improve the service life of piston.
Preferably, multiple fenestras 22 in the present embodiment are circumferentially uniformly distributed along piston 20.This is provided with beneficial to rapid
Uniform and stable oil film is formed in mating surface of the piston 20 with cylinder barrel 30.Play the density degree and working media of the arrangement of fenestra 22
Viscosity it is relevant, the viscosity of working media is higher, rise a fenestra 22 be arranged to it is more intensive；Viscosity is lower, plays fenestra 22 and is arranged to get over
It is sparse.
Preferably, the multiple annular sewage reservoir trough 23 in the present embodiment is axially uniformly distributed along piston 20.This is provided with and is beneficial to
Ensure that the gap uniformity between 30 inner surface of 20 outer ring surface of piston and cylinder barrel is stable.The quantity of sewage reservoir trough 23 and the length of piston 20
It is directly proportional, the density degree of its arrangement is relevant with the viscosity of working media, and the viscosity of working media is higher, and sewage reservoir trough 23 is arranged to
It is more intensive；Viscosity is lower, and sewage reservoir trough 23 is arranged to more sparse.
Further, the sectional area size for starting groove 21 is related to the quantity for playing fenestra 22, should ensure that whole during actual design
The flow of all of fenestra 22 of circle, enables to hydraulic oil and pressure has been delivered in fenestra 22 freely very much, and rise rapidly
Film.The width of sewage reservoir trough is the smaller the better in theory, and depth is 1～1.5 times of width, according to working ability in actual design process
To determine.The piston 20 can also melt attached specialty metal layer with the matching surface of cylinder barrel 30, and the hardness of the specialty metal should be less than
The material of cylinder body of hydraulic oil cylinder, and heat affecting change is little.
When A chambers feed hydraulic oil, pressure differential between A chambers and B chambers, is produced, piston 20 is transported in the presence of hydraulic oil to the left
It is dynamic.Hydraulic oil is entered in the startup groove 21 of piston 20, and by rising in the rapid mating surface in piston 20 with cylinder barrel 30 of fenestra 22
Form oil film；Conversely, when B chambers feed hydraulic oil, piston 20 is moved right in the presence of hydraulic oil.Piston 20 is quick
In reciprocatory movement, wear and tear the solid particle that produces or greasy dirt entered in sewage reservoir trough 23, so as to prevent plowing from piston 20 with
The matching surface of cylinder barrel 30.When piston 20 moves to cylinder barrel end face, the buffer plunger 24 can play a part of deceleration, it is to avoid
20 two ends surface wear of piston.
Compared to prior art, a kind of clearance seal formula piston structure without sealing member of the present utility model, by work
The improvement of plug structure, plays effective lubrication to the mating surface of piston and cylinder barrel, even if the fit clearance of piston and cylinder barrel
Do not result in mating surface to scratch and wear and tear in the case of very little yet, so as to reduce the pressure loss between the cavity at piston two ends and
Hydraulic oil amount of leakage.The clearance seal formula piston structure without sealing member has that the suitability is wide, reliability is high, long service life etc.
Advantage.
This utility model is not limited to above-mentioned embodiment, if do not taken off to various changes of the present utility model or deformation
From spirit and scope of the present utility model, if these are changed and deformation belongs to claim of the present utility model and equivalent technologies
Within the scope of, then this utility model is also intended to comprising these changes and deforms.
Claims (5)
1. a kind of clearance seal formula piston structure without sealing member, including the piston of piston rod, fixed cover outside piston rod
And the cylinder barrel coordinated with piston outer ring surface gap；It is characterized in that：The side face of piston ring offers annular and starts groove, and should
Start groove to connect by multiple fenestras with piston outer ring surface.
2. the clearance seal formula piston structure without sealing member according to claim 1, it is characterised in that：The piston outer shroud
Multiple annular sewage reservoir troughs are offered on face.
3. the clearance seal formula piston structure without sealing member according to claim 1, it is characterised in that：The plurality of skinning
Hole is circumferentially uniformly distributed along piston.
4. the clearance seal formula piston structure without sealing member according to claim 2, it is characterised in that：The plurality of annular
Sewage reservoir trough is axially uniformly distributed along piston.
5. the clearance seal formula piston structure without sealing member according to any one of Claims 1 to 4, it is characterised in that：Institute
State piston two ends and outwardly buffer plunger is equipped with piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621033167.9U CN206072013U (en) | 2016-08-31 | 2016-08-31 | A kind of clearance seal formula piston structure without sealing member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621033167.9U CN206072013U (en) | 2016-08-31 | 2016-08-31 | A kind of clearance seal formula piston structure without sealing member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206072013U true CN206072013U (en) | 2017-04-05 |
Family
ID=58438473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621033167.9U Active CN206072013U (en) | 2016-08-31 | 2016-08-31 | A kind of clearance seal formula piston structure without sealing member |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206072013U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855651A (en) * | 2019-11-12 | 2021-05-28 | 上海朝田实业股份有限公司 | High-precision hydraulic cylinder |
-
2016
- 2016-08-31 CN CN201621033167.9U patent/CN206072013U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855651A (en) * | 2019-11-12 | 2021-05-28 | 上海朝田实业股份有限公司 | High-precision hydraulic cylinder |
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